diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index a926de2..87983e7 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -10,11 +10,11 @@
 	  intend to participate in the MBONE, a high bandwidth network on top
 	  of the Internet which carries audio and video broadcasts. More
 	  information about the MBONE is on the WWW at
-	  <http://www.savetz.com/mbone/>. For most people, it's safe to say N.
+	  <https://www.savetz.com/mbone/>. For most people, it's safe to say N.
 
 config IP_ADVANCED_ROUTER
 	bool "IP: advanced router"
-	---help---
+	help
 	  If you intend to run your Linux box mostly as a router, i.e. as a
 	  computer that forwards and redistributes network packets, say Y; you
 	  will then be presented with several options that allow more precise
@@ -49,14 +49,14 @@
 
 	  Note that some distributions enable it in startup scripts.
 	  For details about rp_filter strict and loose mode read
-	  <file:Documentation/networking/ip-sysctl.txt>.
+	  <file:Documentation/networking/ip-sysctl.rst>.
 
 	  If unsure, say N here.
 
 config IP_FIB_TRIE_STATS
 	bool "FIB TRIE statistics"
 	depends on IP_ADVANCED_ROUTER
-	---help---
+	help
 	  Keep track of statistics on structure of FIB TRIE table.
 	  Useful for testing and measuring TRIE performance.
 
@@ -64,7 +64,7 @@
 	bool "IP: policy routing"
 	depends on IP_ADVANCED_ROUTER
 	select FIB_RULES
-	---help---
+	help
 	  Normally, a router decides what to do with a received packet based
 	  solely on the packet's final destination address. If you say Y here,
 	  the Linux router will also be able to take the packet's source
@@ -73,7 +73,7 @@
 
 	  If you need more information, see the Linux Advanced
 	  Routing and Traffic Control documentation at
-	  <http://lartc.org/howto/lartc.rpdb.html>
+	  <https://lartc.org/howto/lartc.rpdb.html>
 
 	  If unsure, say N.
 
@@ -117,7 +117,7 @@
 config IP_PNP_DHCP
 	bool "IP: DHCP support"
 	depends on IP_PNP
-	---help---
+	help
 	  If you want your Linux box to mount its whole root file system (the
 	  one containing the directory /) from some other computer over the
 	  net via NFS and you want the IP address of your computer to be
@@ -129,12 +129,12 @@
 
 	  If unsure, say Y. Note that if you want to use DHCP, a DHCP server
 	  must be operating on your network.  Read
-	  <file:Documentation/filesystems/nfs/nfsroot.txt> for details.
+	  <file:Documentation/admin-guide/nfs/nfsroot.rst> for details.
 
 config IP_PNP_BOOTP
 	bool "IP: BOOTP support"
 	depends on IP_PNP
-	---help---
+	help
 	  If you want your Linux box to mount its whole root file system (the
 	  one containing the directory /) from some other computer over the
 	  net via NFS and you want the IP address of your computer to be
@@ -144,7 +144,7 @@
 	  does BOOTP itself, providing all necessary information on the kernel
 	  command line, you can say N here. If unsure, say Y. Note that if you
 	  want to use BOOTP, a BOOTP server must be operating on your network.
-	  Read <file:Documentation/filesystems/nfs/nfsroot.txt> for details.
+	  Read <file:Documentation/admin-guide/nfs/nfsroot.rst> for details.
 
 config IP_PNP_RARP
 	bool "IP: RARP support"
@@ -157,13 +157,13 @@
 	  older protocol which is being obsoleted by BOOTP and DHCP), say Y
 	  here. Note that if you want to use RARP, a RARP server must be
 	  operating on your network. Read
-	  <file:Documentation/filesystems/nfs/nfsroot.txt> for details.
+	  <file:Documentation/admin-guide/nfs/nfsroot.rst> for details.
 
 config NET_IPIP
 	tristate "IP: tunneling"
 	select INET_TUNNEL
 	select NET_IP_TUNNEL
-	---help---
+	help
 	  Tunneling means encapsulating data of one protocol type within
 	  another protocol and sending it over a channel that understands the
 	  encapsulating protocol. This particular tunneling driver implements
@@ -180,8 +180,8 @@
 config NET_IPGRE_DEMUX
 	tristate "IP: GRE demultiplexer"
 	help
-	 This is helper module to demultiplex GRE packets on GRE version field criteria.
-	 Required by ip_gre and pptp modules.
+	  This is helper module to demultiplex GRE packets on GRE version field criteria.
+	  Required by ip_gre and pptp modules.
 
 config NET_IP_TUNNEL
 	tristate
@@ -267,7 +267,7 @@
 
 config SYN_COOKIES
 	bool "IP: TCP syncookie support"
-	---help---
+	help
 	  Normal TCP/IP networking is open to an attack known as "SYN
 	  flooding". This denial-of-service attack prevents legitimate remote
 	  users from being able to connect to your computer during an ongoing
@@ -280,7 +280,7 @@
 	  continue to connect, even when your machine is under attack. There
 	  is no need for the legitimate users to change their TCP/IP software;
 	  SYN cookies work transparently to them. For technical information
-	  about SYN cookies, check out <http://cr.yp.to/syncookies.html>.
+	  about SYN cookies, check out <https://cr.yp.to/syncookies.html>.
 
 	  If you are SYN flooded, the source address reported by the kernel is
 	  likely to have been forged by the attacker; it is only reported as
@@ -307,7 +307,7 @@
 	select INET_TUNNEL
 	select NET_IP_TUNNEL
 	select XFRM
-	---help---
+	help
 	  Tunneling means encapsulating data of one protocol type within
 	  another protocol and sending it over a channel that understands the
 	  encapsulating protocol. This can be used with xfrm mode tunnel to give
@@ -323,7 +323,7 @@
 	tristate "IP: Foo (IP protocols) over UDP"
 	select XFRM
 	select NET_UDP_TUNNEL
-	---help---
+	help
 	  Foo over UDP allows any IP protocol to be directly encapsulated
 	  over UDP include tunnels (IPIP, GRE, SIT). By encapsulating in UDP
 	  network mechanisms and optimizations for UDP (such as ECMP
@@ -333,36 +333,38 @@
 	bool "IP: FOU encapsulation of IP tunnels"
 	depends on NET_IPIP || NET_IPGRE || IPV6_SIT
 	select NET_FOU
-	---help---
+	help
 	  Allow configuration of FOU or GUE encapsulation for IP tunnels.
 	  When this option is enabled IP tunnels can be configured to use
 	  FOU or GUE encapsulation.
 
 config INET_AH
 	tristate "IP: AH transformation"
-	select XFRM_ALGO
-	select CRYPTO
-	select CRYPTO_HMAC
-	select CRYPTO_MD5
-	select CRYPTO_SHA1
-	---help---
-	  Support for IPsec AH.
+	select XFRM_AH
+	help
+	  Support for IPsec AH (Authentication Header).
+
+	  AH can be used with various authentication algorithms.  Besides
+	  enabling AH support itself, this option enables the generic
+	  implementations of the algorithms that RFC 8221 lists as MUST be
+	  implemented.  If you need any other algorithms, you'll need to enable
+	  them in the crypto API.  You should also enable accelerated
+	  implementations of any needed algorithms when available.
 
 	  If unsure, say Y.
 
 config INET_ESP
 	tristate "IP: ESP transformation"
-	select XFRM_ALGO
-	select CRYPTO
-	select CRYPTO_AUTHENC
-	select CRYPTO_HMAC
-	select CRYPTO_MD5
-	select CRYPTO_CBC
-	select CRYPTO_SHA1
-	select CRYPTO_DES
-	select CRYPTO_ECHAINIV
-	---help---
-	  Support for IPsec ESP.
+	select XFRM_ESP
+	help
+	  Support for IPsec ESP (Encapsulating Security Payload).
+
+	  ESP can be used with various encryption and authentication algorithms.
+	  Besides enabling ESP support itself, this option enables the generic
+	  implementations of the algorithms that RFC 8221 lists as MUST be
+	  implemented.  If you need any other algorithms, you'll need to enable
+	  them in the crypto API.  You should also enable accelerated
+	  implementations of any needed algorithms when available.
 
 	  If unsure, say Y.
 
@@ -371,7 +373,7 @@
 	depends on INET_ESP
 	select XFRM_OFFLOAD
 	default n
-	---help---
+	help
 	  Support for ESP transformation offload. This makes sense
 	  only if this system really does IPsec and want to do it
 	  with high throughput. A typical desktop system does not
@@ -379,11 +381,23 @@
 
 	  If unsure, say N.
 
+config INET_ESPINTCP
+	bool "IP: ESP in TCP encapsulation (RFC 8229)"
+	depends on XFRM && INET_ESP
+	select STREAM_PARSER
+	select NET_SOCK_MSG
+	select XFRM_ESPINTCP
+	help
+	  Support for RFC 8229 encapsulation of ESP and IKE over
+	  TCP/IPv4 sockets.
+
+	  If unsure, say N.
+
 config INET_IPCOMP
 	tristate "IP: IPComp transformation"
 	select INET_XFRM_TUNNEL
 	select XFRM_IPCOMP
-	---help---
+	help
 	  Support for IP Payload Compression Protocol (IPComp) (RFC3173),
 	  typically needed for IPsec.
 
@@ -401,7 +415,7 @@
 config INET_DIAG
 	tristate "INET: socket monitoring interface"
 	default y
-	---help---
+	help
 	  Support for INET (TCP, DCCP, etc) socket monitoring interface used by
 	  native Linux tools such as ss. ss is included in iproute2, currently
 	  downloadable at:
@@ -418,7 +432,7 @@
 	tristate "UDP: socket monitoring interface"
 	depends on INET_DIAG && (IPV6 || IPV6=n)
 	default n
-	---help---
+	help
 	  Support for UDP socket monitoring interface used by the ss tool.
 	  If unsure, say Y.
 
@@ -426,7 +440,7 @@
 	tristate "RAW: socket monitoring interface"
 	depends on INET_DIAG && (IPV6 || IPV6=n)
 	default n
-	---help---
+	help
 	  Support for RAW socket monitoring interface used by the ss tool.
 	  If unsure, say Y.
 
@@ -434,7 +448,7 @@
 	bool "INET: allow privileged process to administratively close sockets"
 	depends on INET_DIAG
 	default n
-	---help---
+	help
 	  Provides a SOCK_DESTROY operation that allows privileged processes
 	  (e.g., a connection manager or a network administration tool such as
 	  ss) to close sockets opened by other processes. Closing a socket in
@@ -445,7 +459,7 @@
 
 menuconfig TCP_CONG_ADVANCED
 	bool "TCP: advanced congestion control"
-	---help---
+	help
 	  Support for selection of various TCP congestion control
 	  modules.
 
@@ -459,201 +473,201 @@
 config TCP_CONG_BIC
 	tristate "Binary Increase Congestion (BIC) control"
 	default m
-	---help---
-	BIC-TCP is a sender-side only change that ensures a linear RTT
-	fairness under large windows while offering both scalability and
-	bounded TCP-friendliness. The protocol combines two schemes
-	called additive increase and binary search increase. When the
-	congestion window is large, additive increase with a large
-	increment ensures linear RTT fairness as well as good
-	scalability. Under small congestion windows, binary search
-	increase provides TCP friendliness.
-	See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/
+	help
+	  BIC-TCP is a sender-side only change that ensures a linear RTT
+	  fairness under large windows while offering both scalability and
+	  bounded TCP-friendliness. The protocol combines two schemes
+	  called additive increase and binary search increase. When the
+	  congestion window is large, additive increase with a large
+	  increment ensures linear RTT fairness as well as good
+	  scalability. Under small congestion windows, binary search
+	  increase provides TCP friendliness.
+	  See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/
 
 config TCP_CONG_CUBIC
 	tristate "CUBIC TCP"
 	default y
-	---help---
-	This is version 2.0 of BIC-TCP which uses a cubic growth function
-	among other techniques.
-	See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf
+	help
+	  This is version 2.0 of BIC-TCP which uses a cubic growth function
+	  among other techniques.
+	  See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf
 
 config TCP_CONG_WESTWOOD
 	tristate "TCP Westwood+"
 	default m
-	---help---
-	TCP Westwood+ is a sender-side only modification of the TCP Reno
-	protocol stack that optimizes the performance of TCP congestion
-	control. It is based on end-to-end bandwidth estimation to set
-	congestion window and slow start threshold after a congestion
-	episode. Using this estimation, TCP Westwood+ adaptively sets a
-	slow start threshold and a congestion window which takes into
-	account the bandwidth used  at the time congestion is experienced.
-	TCP Westwood+ significantly increases fairness wrt TCP Reno in
-	wired networks and throughput over wireless links.
+	help
+	  TCP Westwood+ is a sender-side only modification of the TCP Reno
+	  protocol stack that optimizes the performance of TCP congestion
+	  control. It is based on end-to-end bandwidth estimation to set
+	  congestion window and slow start threshold after a congestion
+	  episode. Using this estimation, TCP Westwood+ adaptively sets a
+	  slow start threshold and a congestion window which takes into
+	  account the bandwidth used  at the time congestion is experienced.
+	  TCP Westwood+ significantly increases fairness wrt TCP Reno in
+	  wired networks and throughput over wireless links.
 
 config TCP_CONG_HTCP
 	tristate "H-TCP"
 	default m
-	---help---
-	H-TCP is a send-side only modifications of the TCP Reno
-	protocol stack that optimizes the performance of TCP
-	congestion control for high speed network links. It uses a
-	modeswitch to change the alpha and beta parameters of TCP Reno
-	based on network conditions and in a way so as to be fair with
-	other Reno and H-TCP flows.
+	help
+	  H-TCP is a send-side only modifications of the TCP Reno
+	  protocol stack that optimizes the performance of TCP
+	  congestion control for high speed network links. It uses a
+	  modeswitch to change the alpha and beta parameters of TCP Reno
+	  based on network conditions and in a way so as to be fair with
+	  other Reno and H-TCP flows.
 
 config TCP_CONG_HSTCP
 	tristate "High Speed TCP"
 	default n
-	---help---
-	Sally Floyd's High Speed TCP (RFC 3649) congestion control.
-	A modification to TCP's congestion control mechanism for use
-	with large congestion windows. A table indicates how much to
-	increase the congestion window by when an ACK is received.
- 	For more detail	see http://www.icir.org/floyd/hstcp.html
+	help
+	  Sally Floyd's High Speed TCP (RFC 3649) congestion control.
+	  A modification to TCP's congestion control mechanism for use
+	  with large congestion windows. A table indicates how much to
+	  increase the congestion window by when an ACK is received.
+	  For more detail see https://www.icir.org/floyd/hstcp.html
 
 config TCP_CONG_HYBLA
 	tristate "TCP-Hybla congestion control algorithm"
 	default n
-	---help---
-	TCP-Hybla is a sender-side only change that eliminates penalization of
-	long-RTT, large-bandwidth connections, like when satellite legs are
-	involved, especially when sharing a common bottleneck with normal
-	terrestrial connections.
+	help
+	  TCP-Hybla is a sender-side only change that eliminates penalization of
+	  long-RTT, large-bandwidth connections, like when satellite legs are
+	  involved, especially when sharing a common bottleneck with normal
+	  terrestrial connections.
 
 config TCP_CONG_VEGAS
 	tristate "TCP Vegas"
 	default n
-	---help---
-	TCP Vegas is a sender-side only change to TCP that anticipates
-	the onset of congestion by estimating the bandwidth. TCP Vegas
-	adjusts the sending rate by modifying the congestion
-	window. TCP Vegas should provide less packet loss, but it is
-	not as aggressive as TCP Reno.
+	help
+	  TCP Vegas is a sender-side only change to TCP that anticipates
+	  the onset of congestion by estimating the bandwidth. TCP Vegas
+	  adjusts the sending rate by modifying the congestion
+	  window. TCP Vegas should provide less packet loss, but it is
+	  not as aggressive as TCP Reno.
 
 config TCP_CONG_NV
-       tristate "TCP NV"
-       default n
-       ---help---
-       TCP NV is a follow up to TCP Vegas. It has been modified to deal with
-       10G networks, measurement noise introduced by LRO, GRO and interrupt
-       coalescence. In addition, it will decrease its cwnd multiplicatively
-       instead of linearly.
+	tristate "TCP NV"
+	default n
+	help
+	  TCP NV is a follow up to TCP Vegas. It has been modified to deal with
+	  10G networks, measurement noise introduced by LRO, GRO and interrupt
+	  coalescence. In addition, it will decrease its cwnd multiplicatively
+	  instead of linearly.
 
-       Note that in general congestion avoidance (cwnd decreased when # packets
-       queued grows) cannot coexist with congestion control (cwnd decreased only
-       when there is packet loss) due to fairness issues. One scenario when they
-       can coexist safely is when the CA flows have RTTs << CC flows RTTs.
+	  Note that in general congestion avoidance (cwnd decreased when # packets
+	  queued grows) cannot coexist with congestion control (cwnd decreased only
+	  when there is packet loss) due to fairness issues. One scenario when they
+	  can coexist safely is when the CA flows have RTTs << CC flows RTTs.
 
-       For further details see http://www.brakmo.org/networking/tcp-nv/
+	  For further details see http://www.brakmo.org/networking/tcp-nv/
 
 config TCP_CONG_SCALABLE
 	tristate "Scalable TCP"
 	default n
-	---help---
-	Scalable TCP is a sender-side only change to TCP which uses a
-	MIMD congestion control algorithm which has some nice scaling
-	properties, though is known to have fairness issues.
-	See http://www.deneholme.net/tom/scalable/
+	help
+	  Scalable TCP is a sender-side only change to TCP which uses a
+	  MIMD congestion control algorithm which has some nice scaling
+	  properties, though is known to have fairness issues.
+	  See http://www.deneholme.net/tom/scalable/
 
 config TCP_CONG_LP
 	tristate "TCP Low Priority"
 	default n
-	---help---
-	TCP Low Priority (TCP-LP), a distributed algorithm whose goal is
-	to utilize only the excess network bandwidth as compared to the
-	``fair share`` of bandwidth as targeted by TCP.
-	See http://www-ece.rice.edu/networks/TCP-LP/
+	help
+	  TCP Low Priority (TCP-LP), a distributed algorithm whose goal is
+	  to utilize only the excess network bandwidth as compared to the
+	  ``fair share`` of bandwidth as targeted by TCP.
+	  See http://www-ece.rice.edu/networks/TCP-LP/
 
 config TCP_CONG_VENO
 	tristate "TCP Veno"
 	default n
-	---help---
-	TCP Veno is a sender-side only enhancement of TCP to obtain better
-	throughput over wireless networks. TCP Veno makes use of state
-	distinguishing to circumvent the difficult judgment of the packet loss
-	type. TCP Veno cuts down less congestion window in response to random
-	loss packets.
-	See <http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1177186>
+	help
+	  TCP Veno is a sender-side only enhancement of TCP to obtain better
+	  throughput over wireless networks. TCP Veno makes use of state
+	  distinguishing to circumvent the difficult judgment of the packet loss
+	  type. TCP Veno cuts down less congestion window in response to random
+	  loss packets.
+	  See <http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1177186>
 
 config TCP_CONG_YEAH
 	tristate "YeAH TCP"
 	select TCP_CONG_VEGAS
 	default n
-	---help---
-	YeAH-TCP is a sender-side high-speed enabled TCP congestion control
-	algorithm, which uses a mixed loss/delay approach to compute the
-	congestion window. It's design goals target high efficiency,
-	internal, RTT and Reno fairness, resilience to link loss while
-	keeping network elements load as low as possible.
+	help
+	  YeAH-TCP is a sender-side high-speed enabled TCP congestion control
+	  algorithm, which uses a mixed loss/delay approach to compute the
+	  congestion window. It's design goals target high efficiency,
+	  internal, RTT and Reno fairness, resilience to link loss while
+	  keeping network elements load as low as possible.
 
-	For further details look here:
-	  http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf
+	  For further details look here:
+	    http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf
 
 config TCP_CONG_ILLINOIS
 	tristate "TCP Illinois"
 	default n
-	---help---
-	TCP-Illinois is a sender-side modification of TCP Reno for
-	high speed long delay links. It uses round-trip-time to
-	adjust the alpha and beta parameters to achieve a higher average
-	throughput and maintain fairness.
+	help
+	  TCP-Illinois is a sender-side modification of TCP Reno for
+	  high speed long delay links. It uses round-trip-time to
+	  adjust the alpha and beta parameters to achieve a higher average
+	  throughput and maintain fairness.
 
-	For further details see:
-	  http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html
+	  For further details see:
+	    http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html
 
 config TCP_CONG_DCTCP
 	tristate "DataCenter TCP (DCTCP)"
 	default n
-	---help---
-	DCTCP leverages Explicit Congestion Notification (ECN) in the network to
-	provide multi-bit feedback to the end hosts. It is designed to provide:
+	help
+	  DCTCP leverages Explicit Congestion Notification (ECN) in the network to
+	  provide multi-bit feedback to the end hosts. It is designed to provide:
 
-	- High burst tolerance (incast due to partition/aggregate),
-	- Low latency (short flows, queries),
-	- High throughput (continuous data updates, large file transfers) with
-	  commodity, shallow-buffered switches.
+	  - High burst tolerance (incast due to partition/aggregate),
+	  - Low latency (short flows, queries),
+	  - High throughput (continuous data updates, large file transfers) with
+	    commodity, shallow-buffered switches.
 
-	All switches in the data center network running DCTCP must support
-	ECN marking and be configured for marking when reaching defined switch
-	buffer thresholds. The default ECN marking threshold heuristic for
-	DCTCP on switches is 20 packets (30KB) at 1Gbps, and 65 packets
-	(~100KB) at 10Gbps, but might need further careful tweaking.
+	  All switches in the data center network running DCTCP must support
+	  ECN marking and be configured for marking when reaching defined switch
+	  buffer thresholds. The default ECN marking threshold heuristic for
+	  DCTCP on switches is 20 packets (30KB) at 1Gbps, and 65 packets
+	  (~100KB) at 10Gbps, but might need further careful tweaking.
 
-	For further details see:
-	  http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf
+	  For further details see:
+	    http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf
 
 config TCP_CONG_CDG
 	tristate "CAIA Delay-Gradient (CDG)"
 	default n
-	---help---
-	CAIA Delay-Gradient (CDG) is a TCP congestion control that modifies
-	the TCP sender in order to:
+	help
+	  CAIA Delay-Gradient (CDG) is a TCP congestion control that modifies
+	  the TCP sender in order to:
 
 	  o Use the delay gradient as a congestion signal.
 	  o Back off with an average probability that is independent of the RTT.
 	  o Coexist with flows that use loss-based congestion control.
 	  o Tolerate packet loss unrelated to congestion.
 
-	For further details see:
-	  D.A. Hayes and G. Armitage. "Revisiting TCP congestion control using
-	  delay gradients." In Networking 2011. Preprint: http://goo.gl/No3vdg
+	  For further details see:
+	    D.A. Hayes and G. Armitage. "Revisiting TCP congestion control using
+	    delay gradients." In Networking 2011. Preprint: http://goo.gl/No3vdg
 
 config TCP_CONG_BBR
 	tristate "BBR TCP"
 	default n
-	---help---
+	help
 
-	BBR (Bottleneck Bandwidth and RTT) TCP congestion control aims to
-	maximize network utilization and minimize queues. It builds an explicit
-	model of the the bottleneck delivery rate and path round-trip
-	propagation delay. It tolerates packet loss and delay unrelated to
-	congestion. It can operate over LAN, WAN, cellular, wifi, or cable
-	modem links. It can coexist with flows that use loss-based congestion
-	control, and can operate with shallow buffers, deep buffers,
-	bufferbloat, policers, or AQM schemes that do not provide a delay
-	signal. It requires the fq ("Fair Queue") pacing packet scheduler.
+	  BBR (Bottleneck Bandwidth and RTT) TCP congestion control aims to
+	  maximize network utilization and minimize queues. It builds an explicit
+	  model of the bottleneck delivery rate and path round-trip propagation
+	  delay. It tolerates packet loss and delay unrelated to congestion. It
+	  can operate over LAN, WAN, cellular, wifi, or cable modem links. It can
+	  coexist with flows that use loss-based congestion control, and can
+	  operate with shallow buffers, deep buffers, bufferbloat, policers, or
+	  AQM schemes that do not provide a delay signal. It requires the fq
+	  ("Fair Queue") pacing packet scheduler.
 
 choice
 	prompt "Default TCP congestion control"
@@ -722,7 +736,7 @@
 	bool "TCP: MD5 Signature Option support (RFC2385)"
 	select CRYPTO
 	select CRYPTO_MD5
-	---help---
+	help
 	  RFC2385 specifies a method of giving MD5 protection to TCP sessions.
 	  Its main (only?) use is to protect BGP sessions between core routers
 	  on the Internet.
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index d57ecfa..5b77a46 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -14,7 +14,7 @@
 	     udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \
 	     fib_frontend.o fib_semantics.o fib_trie.o fib_notifier.o \
 	     inet_fragment.o ping.o ip_tunnel_core.o gre_offload.o \
-	     metrics.o netlink.o nexthop.o
+	     metrics.o netlink.o nexthop.o udp_tunnel_stub.o
 
 obj-$(CONFIG_BPFILTER) += bpfilter/
 
@@ -29,6 +29,7 @@
 obj-$(CONFIG_NET_FOU) += fou.o
 obj-$(CONFIG_NET_IPGRE_DEMUX) += gre.o
 obj-$(CONFIG_NET_IPGRE) += ip_gre.o
+udp_tunnel-y := udp_tunnel_core.o udp_tunnel_nic.o
 obj-$(CONFIG_NET_UDP_TUNNEL) += udp_tunnel.o
 obj-$(CONFIG_NET_IPVTI) += ip_vti.o
 obj-$(CONFIG_SYN_COOKIES) += syncookies.o
@@ -61,7 +62,12 @@
 obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
 obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
 obj-$(CONFIG_NET_SOCK_MSG) += tcp_bpf.o
+obj-$(CONFIG_BPF_STREAM_PARSER) += udp_bpf.o
 obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
 
 obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
 		      xfrm4_output.o xfrm4_protocol.o
+
+ifeq ($(CONFIG_BPF_JIT),y)
+obj-$(CONFIG_BPF_SYSCALL) += bpf_tcp_ca.o
+endif
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 70f92aa..7422185 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -116,6 +116,7 @@
 #include <linux/mroute.h>
 #endif
 #include <net/l3mdev.h>
+#include <net/compat.h>
 
 #include <trace/events/sock.h>
 
@@ -208,7 +209,7 @@
 	if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
 		goto out;
 
-	sk->sk_max_ack_backlog = backlog;
+	WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
 	/* Really, if the socket is already in listen state
 	 * we can only allow the backlog to be adjusted.
 	 */
@@ -410,6 +411,9 @@
 	if (sk) {
 		long timeout;
 
+		if (!sk->sk_kern_sock)
+			BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
+
 		/* Applications forget to leave groups before exiting */
 		ip_mc_drop_socket(sk);
 
@@ -450,12 +454,12 @@
 	if (err)
 		return err;
 
-	return __inet_bind(sk, uaddr, addr_len, false, true);
+	return __inet_bind(sk, uaddr, addr_len, BIND_WITH_LOCK);
 }
 EXPORT_SYMBOL(inet_bind);
 
 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
-		bool force_bind_address_no_port, bool with_lock)
+		u32 flags)
 {
 	struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 	struct inet_sock *inet = inet_sk(sk);
@@ -495,7 +499,7 @@
 
 	snum = ntohs(addr->sin_port);
 	err = -EACCES;
-	if (snum && snum < inet_prot_sock(net) &&
+	if (snum && inet_port_requires_bind_service(net, snum) &&
 	    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 		goto out;
 
@@ -506,7 +510,7 @@
 	 *      would be illegal to use them (multicast/broadcast) in
 	 *      which case the sending device address is used.
 	 */
-	if (with_lock)
+	if (flags & BIND_WITH_LOCK)
 		lock_sock(sk);
 
 	/* Check these errors (active socket, double bind). */
@@ -520,16 +524,18 @@
 
 	/* Make sure we are allowed to bind here. */
 	if (snum || !(inet->bind_address_no_port ||
-		      force_bind_address_no_port)) {
+		      (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 		if (sk->sk_prot->get_port(sk, snum)) {
 			inet->inet_saddr = inet->inet_rcv_saddr = 0;
 			err = -EADDRINUSE;
 			goto out_release_sock;
 		}
-		err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
-		if (err) {
-			inet->inet_saddr = inet->inet_rcv_saddr = 0;
-			goto out_release_sock;
+		if (!(flags & BIND_FROM_BPF)) {
+			err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
+			if (err) {
+				inet->inet_saddr = inet->inet_rcv_saddr = 0;
+				goto out_release_sock;
+			}
 		}
 	}
 
@@ -543,7 +549,7 @@
 	sk_dst_reset(sk);
 	err = 0;
 out_release_sock:
-	if (with_lock)
+	if (flags & BIND_WITH_LOCK)
 		release_sock(sk);
 out:
 	return err;
@@ -566,7 +572,7 @@
 			return err;
 	}
 
-	if (!inet_sk(sk)->inet_num && inet_autobind(sk))
+	if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
 		return -EAGAIN;
 	return sk->sk_prot->connect(sk, uaddr, addr_len);
 }
@@ -753,12 +759,11 @@
 }
 EXPORT_SYMBOL(inet_accept);
 
-
 /*
  *	This does both peername and sockname.
  */
 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
-			int peer)
+		 int peer)
 {
 	struct sock *sk		= sock->sk;
 	struct inet_sock *inet	= inet_sk(sk);
@@ -779,6 +784,11 @@
 		sin->sin_port = inet->inet_sport;
 		sin->sin_addr.s_addr = addr;
 	}
+	if (cgroup_bpf_enabled)
+		BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
+					    peer ? BPF_CGROUP_INET4_GETPEERNAME :
+						   BPF_CGROUP_INET4_GETSOCKNAME,
+					    NULL);
 	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 	return sizeof(*sin);
 }
@@ -789,7 +799,7 @@
 	sock_rps_record_flow(sk);
 
 	/* We may need to bind the socket. */
-	if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
+	if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
 	    inet_autobind(sk))
 		return -EAGAIN;
 
@@ -872,7 +882,7 @@
 		err = -ENOTCONN;
 		/* Hack to wake up other listeners, who can poll for
 		   EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
-		/* fall through */
+		fallthrough;
 	default:
 		sk->sk_shutdown |= how;
 		if (sk->sk_prot->shutdown)
@@ -886,7 +896,7 @@
 	case TCP_LISTEN:
 		if (!(how & RCV_SHUTDOWN))
 			break;
-		/* fall through */
+		fallthrough;
 	case TCP_SYN_SENT:
 		err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
 		sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
@@ -968,20 +978,46 @@
 EXPORT_SYMBOL(inet_ioctl);
 
 #ifdef CONFIG_COMPAT
+static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
+		struct compat_rtentry __user *ur)
+{
+	compat_uptr_t rtdev;
+	struct rtentry rt;
+
+	if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
+			3 * sizeof(struct sockaddr)) ||
+	    get_user(rt.rt_flags, &ur->rt_flags) ||
+	    get_user(rt.rt_metric, &ur->rt_metric) ||
+	    get_user(rt.rt_mtu, &ur->rt_mtu) ||
+	    get_user(rt.rt_window, &ur->rt_window) ||
+	    get_user(rt.rt_irtt, &ur->rt_irtt) ||
+	    get_user(rtdev, &ur->rt_dev))
+		return -EFAULT;
+
+	rt.rt_dev = compat_ptr(rtdev);
+	return ip_rt_ioctl(sock_net(sk), cmd, &rt);
+}
+
 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
+	void __user *argp = compat_ptr(arg);
 	struct sock *sk = sock->sk;
-	int err = -ENOIOCTLCMD;
 
-	if (sk->sk_prot->compat_ioctl)
-		err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
-
-	return err;
+	switch (cmd) {
+	case SIOCADDRT:
+	case SIOCDELRT:
+		return inet_compat_routing_ioctl(sk, cmd, argp);
+	default:
+		if (!sk->sk_prot->compat_ioctl)
+			return -ENOIOCTLCMD;
+		return sk->sk_prot->compat_ioctl(sk, cmd, arg);
+	}
 }
-#endif
+#endif /* CONFIG_COMPAT */
 
 const struct proto_ops inet_stream_ops = {
 	.family		   = PF_INET,
+	.flags		   = PROTO_CMSG_DATA_ONLY,
 	.owner		   = THIS_MODULE,
 	.release	   = inet_release,
 	.bind		   = inet_bind,
@@ -1008,8 +1044,6 @@
 	.sendpage_locked   = tcp_sendpage_locked,
 	.peek_len	   = tcp_peek_len,
 #ifdef CONFIG_COMPAT
-	.compat_setsockopt = compat_sock_common_setsockopt,
-	.compat_getsockopt = compat_sock_common_getsockopt,
 	.compat_ioctl	   = inet_compat_ioctl,
 #endif
 	.set_rcvlowat	   = tcp_set_rcvlowat,
@@ -1038,8 +1072,6 @@
 	.sendpage	   = inet_sendpage,
 	.set_peek_off	   = sk_set_peek_off,
 #ifdef CONFIG_COMPAT
-	.compat_setsockopt = compat_sock_common_setsockopt,
-	.compat_getsockopt = compat_sock_common_getsockopt,
 	.compat_ioctl	   = inet_compat_ioctl,
 #endif
 };
@@ -1070,8 +1102,6 @@
 	.mmap		   = sock_no_mmap,
 	.sendpage	   = inet_sendpage,
 #ifdef CONFIG_COMPAT
-	.compat_setsockopt = compat_sock_common_setsockopt,
-	.compat_getsockopt = compat_sock_common_getsockopt,
 	.compat_ioctl	   = inet_compat_ioctl,
 #endif
 };
@@ -1344,8 +1374,11 @@
 	}
 
 	ops = rcu_dereference(inet_offloads[proto]);
-	if (likely(ops && ops->callbacks.gso_segment))
+	if (likely(ops && ops->callbacks.gso_segment)) {
 		segs = ops->callbacks.gso_segment(skb, features);
+		if (!segs)
+			skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
+	}
 
 	if (IS_ERR_OR_NULL(segs))
 		goto out;
@@ -1400,10 +1433,6 @@
 	return inet_gso_segment(skb, features);
 }
 
-INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *,
-							   struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
-							   struct sk_buff *));
 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
 {
 	const struct net_offload *ops;
@@ -1576,8 +1605,6 @@
 	return -EINVAL;
 }
 
-INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *, int));
-INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int));
 int inet_gro_complete(struct sk_buff *skb, int nhoff)
 {
 	__be16 newlen = htons(skb->len - nhoff);
@@ -1793,6 +1820,10 @@
 	free_percpu(net->mib.net_statistics);
 	free_percpu(net->mib.ip_statistics);
 	free_percpu(net->mib.tcp_statistics);
+#ifdef CONFIG_MPTCP
+	/* allocated on demand, see mptcp_init_sock() */
+	free_percpu(net->mib.mptcp_statistics);
+#endif
 }
 
 static __net_initdata struct pernet_operations ipv4_mib_ops = {
@@ -1831,6 +1862,7 @@
 	net->ipv4.sysctl_ip_early_demux = 1;
 	net->ipv4.sysctl_udp_early_demux = 1;
 	net->ipv4.sysctl_tcp_early_demux = 1;
+	net->ipv4.sysctl_nexthop_compat_mode = 1;
 #ifdef CONFIG_SYSCTL
 	net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
 #endif
@@ -1910,7 +1942,7 @@
 {
 	struct inet_protosw *q;
 	struct list_head *r;
-	int rc = -EINVAL;
+	int rc;
 
 	sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
 
@@ -1974,6 +2006,10 @@
 
 	ip_init();
 
+	/* Initialise per-cpu ipv4 mibs */
+	if (init_ipv4_mibs())
+		panic("%s: Cannot init ipv4 mibs\n", __func__);
+
 	/* Setup TCP slab cache for open requests. */
 	tcp_init();
 
@@ -2004,12 +2040,6 @@
 
 	if (init_inet_pernet_ops())
 		pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
-	/*
-	 *	Initialise per-cpu ipv4 mibs
-	 */
-
-	if (init_ipv4_mibs())
-		pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
 
 	ipv4_proc_init();
 
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index 974179b..36ed85b 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -107,7 +107,7 @@
 			if (optlen < 6)
 				return -EINVAL;
 			memcpy(daddr, optptr+optlen-4, 4);
-			/* Fall through */
+			fallthrough;
 		default:
 			memset(optptr, 0, optlen);
 		}
@@ -141,7 +141,7 @@
 	}
 
 	kfree(AH_SKB_CB(skb)->tmp);
-	xfrm_output_resume(skb, err);
+	xfrm_output_resume(skb->sk, skb, err);
 }
 
 static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 7b95199..922dd73 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1187,7 +1187,7 @@
 	case SIOCSARP:
 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 			return -EPERM;
-		/* fall through */
+		fallthrough;
 	case SIOCGARP:
 		err = copy_from_user(&r, arg, sizeof(struct arpreq));
 		if (err)
diff --git a/net/ipv4/bpf_tcp_ca.c b/net/ipv4/bpf_tcp_ca.c
new file mode 100644
index 0000000..618954f
--- /dev/null
+++ b/net/ipv4/bpf_tcp_ca.c
@@ -0,0 +1,254 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 Facebook  */
+
+#include <linux/types.h>
+#include <linux/bpf_verifier.h>
+#include <linux/bpf.h>
+#include <linux/btf.h>
+#include <linux/filter.h>
+#include <net/tcp.h>
+#include <net/bpf_sk_storage.h>
+
+static u32 optional_ops[] = {
+	offsetof(struct tcp_congestion_ops, init),
+	offsetof(struct tcp_congestion_ops, release),
+	offsetof(struct tcp_congestion_ops, set_state),
+	offsetof(struct tcp_congestion_ops, cwnd_event),
+	offsetof(struct tcp_congestion_ops, in_ack_event),
+	offsetof(struct tcp_congestion_ops, pkts_acked),
+	offsetof(struct tcp_congestion_ops, min_tso_segs),
+	offsetof(struct tcp_congestion_ops, sndbuf_expand),
+	offsetof(struct tcp_congestion_ops, cong_control),
+};
+
+static u32 unsupported_ops[] = {
+	offsetof(struct tcp_congestion_ops, get_info),
+};
+
+static const struct btf_type *tcp_sock_type;
+static u32 tcp_sock_id, sock_id;
+
+static int bpf_tcp_ca_init(struct btf *btf)
+{
+	s32 type_id;
+
+	type_id = btf_find_by_name_kind(btf, "sock", BTF_KIND_STRUCT);
+	if (type_id < 0)
+		return -EINVAL;
+	sock_id = type_id;
+
+	type_id = btf_find_by_name_kind(btf, "tcp_sock", BTF_KIND_STRUCT);
+	if (type_id < 0)
+		return -EINVAL;
+	tcp_sock_id = type_id;
+	tcp_sock_type = btf_type_by_id(btf, tcp_sock_id);
+
+	return 0;
+}
+
+static bool is_optional(u32 member_offset)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(optional_ops); i++) {
+		if (member_offset == optional_ops[i])
+			return true;
+	}
+
+	return false;
+}
+
+static bool is_unsupported(u32 member_offset)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(unsupported_ops); i++) {
+		if (member_offset == unsupported_ops[i])
+			return true;
+	}
+
+	return false;
+}
+
+extern struct btf *btf_vmlinux;
+
+static bool bpf_tcp_ca_is_valid_access(int off, int size,
+				       enum bpf_access_type type,
+				       const struct bpf_prog *prog,
+				       struct bpf_insn_access_aux *info)
+{
+	if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
+		return false;
+	if (type != BPF_READ)
+		return false;
+	if (off % size != 0)
+		return false;
+
+	if (!btf_ctx_access(off, size, type, prog, info))
+		return false;
+
+	if (info->reg_type == PTR_TO_BTF_ID && info->btf_id == sock_id)
+		/* promote it to tcp_sock */
+		info->btf_id = tcp_sock_id;
+
+	return true;
+}
+
+static int bpf_tcp_ca_btf_struct_access(struct bpf_verifier_log *log,
+					const struct btf_type *t, int off,
+					int size, enum bpf_access_type atype,
+					u32 *next_btf_id)
+{
+	size_t end;
+
+	if (atype == BPF_READ)
+		return btf_struct_access(log, t, off, size, atype, next_btf_id);
+
+	if (t != tcp_sock_type) {
+		bpf_log(log, "only read is supported\n");
+		return -EACCES;
+	}
+
+	switch (off) {
+	case bpf_ctx_range(struct inet_connection_sock, icsk_ca_priv):
+		end = offsetofend(struct inet_connection_sock, icsk_ca_priv);
+		break;
+	case offsetof(struct inet_connection_sock, icsk_ack.pending):
+		end = offsetofend(struct inet_connection_sock,
+				  icsk_ack.pending);
+		break;
+	case offsetof(struct tcp_sock, snd_cwnd):
+		end = offsetofend(struct tcp_sock, snd_cwnd);
+		break;
+	case offsetof(struct tcp_sock, snd_cwnd_cnt):
+		end = offsetofend(struct tcp_sock, snd_cwnd_cnt);
+		break;
+	case offsetof(struct tcp_sock, snd_ssthresh):
+		end = offsetofend(struct tcp_sock, snd_ssthresh);
+		break;
+	case offsetof(struct tcp_sock, ecn_flags):
+		end = offsetofend(struct tcp_sock, ecn_flags);
+		break;
+	default:
+		bpf_log(log, "no write support to tcp_sock at off %d\n", off);
+		return -EACCES;
+	}
+
+	if (off + size > end) {
+		bpf_log(log,
+			"write access at off %d with size %d beyond the member of tcp_sock ended at %zu\n",
+			off, size, end);
+		return -EACCES;
+	}
+
+	return NOT_INIT;
+}
+
+BPF_CALL_2(bpf_tcp_send_ack, struct tcp_sock *, tp, u32, rcv_nxt)
+{
+	/* bpf_tcp_ca prog cannot have NULL tp */
+	__tcp_send_ack((struct sock *)tp, rcv_nxt);
+	return 0;
+}
+
+static const struct bpf_func_proto bpf_tcp_send_ack_proto = {
+	.func		= bpf_tcp_send_ack,
+	.gpl_only	= false,
+	/* In case we want to report error later */
+	.ret_type	= RET_INTEGER,
+	.arg1_type	= ARG_PTR_TO_BTF_ID,
+	.arg1_btf_id	= &tcp_sock_id,
+	.arg2_type	= ARG_ANYTHING,
+};
+
+static const struct bpf_func_proto *
+bpf_tcp_ca_get_func_proto(enum bpf_func_id func_id,
+			  const struct bpf_prog *prog)
+{
+	switch (func_id) {
+	case BPF_FUNC_tcp_send_ack:
+		return &bpf_tcp_send_ack_proto;
+	case BPF_FUNC_sk_storage_get:
+		return &bpf_sk_storage_get_proto;
+	case BPF_FUNC_sk_storage_delete:
+		return &bpf_sk_storage_delete_proto;
+	default:
+		return bpf_base_func_proto(func_id);
+	}
+}
+
+static const struct bpf_verifier_ops bpf_tcp_ca_verifier_ops = {
+	.get_func_proto		= bpf_tcp_ca_get_func_proto,
+	.is_valid_access	= bpf_tcp_ca_is_valid_access,
+	.btf_struct_access	= bpf_tcp_ca_btf_struct_access,
+};
+
+static int bpf_tcp_ca_init_member(const struct btf_type *t,
+				  const struct btf_member *member,
+				  void *kdata, const void *udata)
+{
+	const struct tcp_congestion_ops *utcp_ca;
+	struct tcp_congestion_ops *tcp_ca;
+	int prog_fd;
+	u32 moff;
+
+	utcp_ca = (const struct tcp_congestion_ops *)udata;
+	tcp_ca = (struct tcp_congestion_ops *)kdata;
+
+	moff = btf_member_bit_offset(t, member) / 8;
+	switch (moff) {
+	case offsetof(struct tcp_congestion_ops, flags):
+		if (utcp_ca->flags & ~TCP_CONG_MASK)
+			return -EINVAL;
+		tcp_ca->flags = utcp_ca->flags;
+		return 1;
+	case offsetof(struct tcp_congestion_ops, name):
+		if (bpf_obj_name_cpy(tcp_ca->name, utcp_ca->name,
+				     sizeof(tcp_ca->name)) <= 0)
+			return -EINVAL;
+		if (tcp_ca_find(utcp_ca->name))
+			return -EEXIST;
+		return 1;
+	}
+
+	if (!btf_type_resolve_func_ptr(btf_vmlinux, member->type, NULL))
+		return 0;
+
+	/* Ensure bpf_prog is provided for compulsory func ptr */
+	prog_fd = (int)(*(unsigned long *)(udata + moff));
+	if (!prog_fd && !is_optional(moff) && !is_unsupported(moff))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int bpf_tcp_ca_check_member(const struct btf_type *t,
+				   const struct btf_member *member)
+{
+	if (is_unsupported(btf_member_bit_offset(t, member) / 8))
+		return -ENOTSUPP;
+	return 0;
+}
+
+static int bpf_tcp_ca_reg(void *kdata)
+{
+	return tcp_register_congestion_control(kdata);
+}
+
+static void bpf_tcp_ca_unreg(void *kdata)
+{
+	tcp_unregister_congestion_control(kdata);
+}
+
+/* Avoid sparse warning.  It is only used in bpf_struct_ops.c. */
+extern struct bpf_struct_ops bpf_tcp_congestion_ops;
+
+struct bpf_struct_ops bpf_tcp_congestion_ops = {
+	.verifier_ops = &bpf_tcp_ca_verifier_ops,
+	.reg = bpf_tcp_ca_reg,
+	.unreg = bpf_tcp_ca_unreg,
+	.check_member = bpf_tcp_ca_check_member,
+	.init_member = bpf_tcp_ca_init_member,
+	.init = bpf_tcp_ca_init,
+	.name = "tcp_congestion_ops",
+};
diff --git a/net/ipv4/bpfilter/sockopt.c b/net/ipv4/bpfilter/sockopt.c
index 0480918..1b34cb9 100644
--- a/net/ipv4/bpfilter/sockopt.c
+++ b/net/ipv4/bpfilter/sockopt.c
@@ -12,18 +12,16 @@
 struct bpfilter_umh_ops bpfilter_ops;
 EXPORT_SYMBOL_GPL(bpfilter_ops);
 
-static void bpfilter_umh_cleanup(struct umh_info *info)
+void bpfilter_umh_cleanup(struct umd_info *info)
 {
-	mutex_lock(&bpfilter_ops.lock);
-	bpfilter_ops.stop = true;
 	fput(info->pipe_to_umh);
 	fput(info->pipe_from_umh);
-	info->pid = 0;
-	mutex_unlock(&bpfilter_ops.lock);
+	put_pid(info->tgid);
+	info->tgid = NULL;
 }
+EXPORT_SYMBOL_GPL(bpfilter_umh_cleanup);
 
-static int bpfilter_mbox_request(struct sock *sk, int optname,
-				 char __user *optval,
+static int bpfilter_mbox_request(struct sock *sk, int optname, sockptr_t optval,
 				 unsigned int optlen, bool is_set)
 {
 	int err;
@@ -38,7 +36,11 @@
 			goto out;
 		}
 	}
-	if (bpfilter_ops.stop) {
+	if (bpfilter_ops.info.tgid &&
+	    thread_group_exited(bpfilter_ops.info.tgid))
+		bpfilter_umh_cleanup(&bpfilter_ops.info);
+
+	if (!bpfilter_ops.info.tgid) {
 		err = bpfilter_ops.start();
 		if (err)
 			goto out;
@@ -49,7 +51,7 @@
 	return err;
 }
 
-int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char __user *optval,
+int bpfilter_ip_set_sockopt(struct sock *sk, int optname, sockptr_t optval,
 			    unsigned int optlen)
 {
 	return bpfilter_mbox_request(sk, optname, optval, optlen, true);
@@ -63,15 +65,15 @@
 	if (get_user(len, optlen))
 		return -EFAULT;
 
-	return bpfilter_mbox_request(sk, optname, optval, len, false);
+	return bpfilter_mbox_request(sk, optname, USER_SOCKPTR(optval), len,
+				     false);
 }
 
 static int __init bpfilter_sockopt_init(void)
 {
 	mutex_init(&bpfilter_ops.lock);
-	bpfilter_ops.stop = true;
-	bpfilter_ops.info.cmdline = "bpfilter_umh";
-	bpfilter_ops.info.cleanup = &bpfilter_umh_cleanup;
+	bpfilter_ops.info.tgid = NULL;
+	bpfilter_ops.info.driver_name = "bpfilter_umh";
 
 	return 0;
 }
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index c1ac802..ca217a6 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -10,9 +10,9 @@
  *
  * The CIPSO draft specification can be found in the kernel's Documentation
  * directory as well as the following URL:
- *   http://tools.ietf.org/id/draft-ietf-cipso-ipsecurity-01.txt
+ *   https://tools.ietf.org/id/draft-ietf-cipso-ipsecurity-01.txt
  * The FIPS-188 specification can be found at the following URL:
- *   http://www.itl.nist.gov/fipspubs/fip188.htm
+ *   https://www.itl.nist.gov/fipspubs/fip188.htm
  *
  * Author: Paul Moore <paul.moore@hp.com>
  */
@@ -283,7 +283,7 @@
 
 /**
  * cipso_v4_cache_add - Add an entry to the CIPSO cache
- * @skb: the packet
+ * @cipso_ptr: pointer to CIPSO IP option
  * @secattr: the packet's security attributes
  *
  * Description:
@@ -499,7 +499,7 @@
 /**
  * cipso_v4_doi_remove - Remove an existing DOI from the CIPSO protocol engine
  * @doi: the DOI value
- * @audit_secid: the LSM secid to use in the audit message
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Removes a DOI definition from the CIPSO engine.  The NetLabel routines will
@@ -1527,6 +1527,7 @@
 
 /**
  * cipso_v4_validate - Validate a CIPSO option
+ * @skb: the packet
  * @option: the start of the option, on error it is set to point to the error
  *
  * Description:
@@ -2058,7 +2059,7 @@
 
 /**
  * cipso_v4_req_delattr - Delete the CIPSO option from a request socket
- * @reg: the request socket
+ * @req: the request socket
  *
  * Description:
  * Removes the CIPSO option from a request socket, if present.
@@ -2150,6 +2151,7 @@
 /**
  * cipso_v4_skbuff_setattr - Set the CIPSO option on a packet
  * @skb: the packet
+ * @doi_def: the DOI structure
  * @secattr: the security attributes
  *
  * Description:
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 603a349..148ef48 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1572,11 +1572,11 @@
 			}
 		}
 		ip_mc_up(in_dev);
-		/* fall through */
+		fallthrough;
 	case NETDEV_CHANGEADDR:
 		if (!IN_DEV_ARP_NOTIFY(in_dev))
 			break;
-		/* fall through */
+		fallthrough;
 	case NETDEV_NOTIFY_PEERS:
 		/* Send gratuitous ARP to notify of link change */
 		inetdev_send_gratuitous_arp(dev, in_dev);
@@ -1594,7 +1594,7 @@
 		if (inetdev_valid_mtu(dev->mtu))
 			break;
 		/* disable IP when MTU is not enough */
-		/* fall through */
+		fallthrough;
 	case NETDEV_UNREGISTER:
 		inetdev_destroy(in_dev);
 		break;
@@ -2367,8 +2367,7 @@
 }
 
 static int devinet_conf_proc(struct ctl_table *ctl, int write,
-			     void __user *buffer,
-			     size_t *lenp, loff_t *ppos)
+			     void *buffer, size_t *lenp, loff_t *ppos)
 {
 	int old_value = *(int *)ctl->data;
 	int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
@@ -2420,8 +2419,7 @@
 }
 
 static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
-				  void __user *buffer,
-				  size_t *lenp, loff_t *ppos)
+				  void *buffer, size_t *lenp, loff_t *ppos)
 {
 	int *valp = ctl->data;
 	int val = *valp;
@@ -2464,8 +2462,7 @@
 }
 
 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
-				void __user *buffer,
-				size_t *lenp, loff_t *ppos)
+				void *buffer, size_t *lenp, loff_t *ppos)
 {
 	int *valp = ctl->data;
 	int val = *valp;
@@ -2585,7 +2582,7 @@
 free:
 	kfree(t);
 out:
-	return -ENOBUFS;
+	return -ENOMEM;
 }
 
 static void __devinet_sysctl_unregister(struct net *net,
@@ -2670,11 +2667,24 @@
 	tbl[0].extra2 = net;
 #endif
 
-	if ((!IS_ENABLED(CONFIG_SYSCTL) ||
-	     sysctl_devconf_inherit_init_net != 2) &&
-	    !net_eq(net, &init_net)) {
-		memcpy(all, init_net.ipv4.devconf_all, sizeof(ipv4_devconf));
-		memcpy(dflt, init_net.ipv4.devconf_dflt, sizeof(ipv4_devconf_dflt));
+	if (!net_eq(net, &init_net)) {
+		if (IS_ENABLED(CONFIG_SYSCTL) &&
+		    sysctl_devconf_inherit_init_net == 3) {
+			/* copy from the current netns */
+			memcpy(all, current->nsproxy->net_ns->ipv4.devconf_all,
+			       sizeof(ipv4_devconf));
+			memcpy(dflt,
+			       current->nsproxy->net_ns->ipv4.devconf_dflt,
+			       sizeof(ipv4_devconf_dflt));
+		} else if (!IS_ENABLED(CONFIG_SYSCTL) ||
+			   sysctl_devconf_inherit_init_net != 2) {
+			/* inherit == 0 or 1: copy from init_net */
+			memcpy(all, init_net.ipv4.devconf_all,
+			       sizeof(ipv4_devconf));
+			memcpy(dflt, init_net.ipv4.devconf_dflt,
+			       sizeof(ipv4_devconf_dflt));
+		}
+		/* else inherit == 2: use compiled values */
 	}
 
 #ifdef CONFIG_SYSCTL
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 86c836f..9aae821 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -18,6 +18,8 @@
 #include <net/icmp.h>
 #include <net/protocol.h>
 #include <net/udp.h>
+#include <net/tcp.h>
+#include <net/espintcp.h>
 
 #include <linux/highmem.h>
 
@@ -117,6 +119,132 @@
 			put_page(sg_page(sg));
 }
 
+#ifdef CONFIG_INET_ESPINTCP
+struct esp_tcp_sk {
+	struct sock *sk;
+	struct rcu_head rcu;
+};
+
+static void esp_free_tcp_sk(struct rcu_head *head)
+{
+	struct esp_tcp_sk *esk = container_of(head, struct esp_tcp_sk, rcu);
+
+	sock_put(esk->sk);
+	kfree(esk);
+}
+
+static struct sock *esp_find_tcp_sk(struct xfrm_state *x)
+{
+	struct xfrm_encap_tmpl *encap = x->encap;
+	struct esp_tcp_sk *esk;
+	__be16 sport, dport;
+	struct sock *nsk;
+	struct sock *sk;
+
+	sk = rcu_dereference(x->encap_sk);
+	if (sk && sk->sk_state == TCP_ESTABLISHED)
+		return sk;
+
+	spin_lock_bh(&x->lock);
+	sport = encap->encap_sport;
+	dport = encap->encap_dport;
+	nsk = rcu_dereference_protected(x->encap_sk,
+					lockdep_is_held(&x->lock));
+	if (sk && sk == nsk) {
+		esk = kmalloc(sizeof(*esk), GFP_ATOMIC);
+		if (!esk) {
+			spin_unlock_bh(&x->lock);
+			return ERR_PTR(-ENOMEM);
+		}
+		RCU_INIT_POINTER(x->encap_sk, NULL);
+		esk->sk = sk;
+		call_rcu(&esk->rcu, esp_free_tcp_sk);
+	}
+	spin_unlock_bh(&x->lock);
+
+	sk = inet_lookup_established(xs_net(x), &tcp_hashinfo, x->id.daddr.a4,
+				     dport, x->props.saddr.a4, sport, 0);
+	if (!sk)
+		return ERR_PTR(-ENOENT);
+
+	if (!tcp_is_ulp_esp(sk)) {
+		sock_put(sk);
+		return ERR_PTR(-EINVAL);
+	}
+
+	spin_lock_bh(&x->lock);
+	nsk = rcu_dereference_protected(x->encap_sk,
+					lockdep_is_held(&x->lock));
+	if (encap->encap_sport != sport ||
+	    encap->encap_dport != dport) {
+		sock_put(sk);
+		sk = nsk ?: ERR_PTR(-EREMCHG);
+	} else if (sk == nsk) {
+		sock_put(sk);
+	} else {
+		rcu_assign_pointer(x->encap_sk, sk);
+	}
+	spin_unlock_bh(&x->lock);
+
+	return sk;
+}
+
+static int esp_output_tcp_finish(struct xfrm_state *x, struct sk_buff *skb)
+{
+	struct sock *sk;
+	int err;
+
+	rcu_read_lock();
+
+	sk = esp_find_tcp_sk(x);
+	err = PTR_ERR_OR_ZERO(sk);
+	if (err)
+		goto out;
+
+	bh_lock_sock(sk);
+	if (sock_owned_by_user(sk))
+		err = espintcp_queue_out(sk, skb);
+	else
+		err = espintcp_push_skb(sk, skb);
+	bh_unlock_sock(sk);
+
+out:
+	rcu_read_unlock();
+	return err;
+}
+
+static int esp_output_tcp_encap_cb(struct net *net, struct sock *sk,
+				   struct sk_buff *skb)
+{
+	struct dst_entry *dst = skb_dst(skb);
+	struct xfrm_state *x = dst->xfrm;
+
+	return esp_output_tcp_finish(x, skb);
+}
+
+static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
+{
+	int err;
+
+	local_bh_disable();
+	err = xfrm_trans_queue_net(xs_net(x), skb, esp_output_tcp_encap_cb);
+	local_bh_enable();
+
+	/* EINPROGRESS just happens to do the right thing.  It
+	 * actually means that the skb has been consumed and
+	 * isn't coming back.
+	 */
+	return err ?: -EINPROGRESS;
+}
+#else
+static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
+{
+	kfree_skb(skb);
+
+	return -EOPNOTSUPP;
+}
+#endif
+
 static void esp_output_done(struct crypto_async_request *base, int err)
 {
 	struct sk_buff *skb = base->data;
@@ -147,7 +275,11 @@
 		secpath_reset(skb);
 		xfrm_dev_resume(skb);
 	} else {
-		xfrm_output_resume(skb, err);
+		if (!err &&
+		    x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
+			esp_output_tail_tcp(x, skb);
+		else
+			xfrm_output_resume(skb->sk, skb, err);
 	}
 }
 
@@ -209,61 +341,100 @@
 	esp_output_done(base, err);
 }
 
-static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
+static struct ip_esp_hdr *esp_output_udp_encap(struct sk_buff *skb,
+					       int encap_type,
+					       struct esp_info *esp,
+					       __be16 sport,
+					       __be16 dport)
 {
-	/* Fill padding... */
-	if (tfclen) {
-		memset(tail, 0, tfclen);
-		tail += tfclen;
-	}
-	do {
-		int i;
-		for (i = 0; i < plen - 2; i++)
-			tail[i] = i + 1;
-	} while (0);
-	tail[plen - 2] = plen - 2;
-	tail[plen - 1] = proto;
-}
-
-static int esp_output_udp_encap(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
-{
-	int encap_type;
 	struct udphdr *uh;
 	__be32 *udpdata32;
-	__be16 sport, dport;
-	struct xfrm_encap_tmpl *encap = x->encap;
-	struct ip_esp_hdr *esph = esp->esph;
 	unsigned int len;
 
+	len = skb->len + esp->tailen - skb_transport_offset(skb);
+	if (len + sizeof(struct iphdr) > IP_MAX_MTU)
+		return ERR_PTR(-EMSGSIZE);
+
+	uh = (struct udphdr *)esp->esph;
+	uh->source = sport;
+	uh->dest = dport;
+	uh->len = htons(len);
+	uh->check = 0;
+
+	*skb_mac_header(skb) = IPPROTO_UDP;
+
+	if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
+		udpdata32 = (__be32 *)(uh + 1);
+		udpdata32[0] = udpdata32[1] = 0;
+		return (struct ip_esp_hdr *)(udpdata32 + 2);
+	}
+
+	return (struct ip_esp_hdr *)(uh + 1);
+}
+
+#ifdef CONFIG_INET_ESPINTCP
+static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x,
+						    struct sk_buff *skb,
+						    struct esp_info *esp)
+{
+	__be16 *lenp = (void *)esp->esph;
+	struct ip_esp_hdr *esph;
+	unsigned int len;
+	struct sock *sk;
+
+	len = skb->len + esp->tailen - skb_transport_offset(skb);
+	if (len > IP_MAX_MTU)
+		return ERR_PTR(-EMSGSIZE);
+
+	rcu_read_lock();
+	sk = esp_find_tcp_sk(x);
+	rcu_read_unlock();
+
+	if (IS_ERR(sk))
+		return ERR_CAST(sk);
+
+	*lenp = htons(len);
+	esph = (struct ip_esp_hdr *)(lenp + 1);
+
+	return esph;
+}
+#else
+static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x,
+						    struct sk_buff *skb,
+						    struct esp_info *esp)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+#endif
+
+static int esp_output_encap(struct xfrm_state *x, struct sk_buff *skb,
+			    struct esp_info *esp)
+{
+	struct xfrm_encap_tmpl *encap = x->encap;
+	struct ip_esp_hdr *esph;
+	__be16 sport, dport;
+	int encap_type;
+
 	spin_lock_bh(&x->lock);
 	sport = encap->encap_sport;
 	dport = encap->encap_dport;
 	encap_type = encap->encap_type;
 	spin_unlock_bh(&x->lock);
 
-	len = skb->len + esp->tailen - skb_transport_offset(skb);
-	if (len + sizeof(struct iphdr) >= IP_MAX_MTU)
-		return -EMSGSIZE;
-
-	uh = (struct udphdr *)esph;
-	uh->source = sport;
-	uh->dest = dport;
-	uh->len = htons(len);
-	uh->check = 0;
-
 	switch (encap_type) {
 	default:
 	case UDP_ENCAP_ESPINUDP:
-		esph = (struct ip_esp_hdr *)(uh + 1);
-		break;
 	case UDP_ENCAP_ESPINUDP_NON_IKE:
-		udpdata32 = (__be32 *)(uh + 1);
-		udpdata32[0] = udpdata32[1] = 0;
-		esph = (struct ip_esp_hdr *)(udpdata32 + 2);
+		esph = esp_output_udp_encap(skb, encap_type, esp, sport, dport);
+		break;
+	case TCP_ENCAP_ESPINTCP:
+		esph = esp_output_tcp_encap(x, skb, esp);
 		break;
 	}
 
-	*skb_mac_header(skb) = IPPROTO_UDP;
+	if (IS_ERR(esph))
+		return PTR_ERR(esph);
+
 	esp->esph = esph;
 
 	return 0;
@@ -277,15 +448,20 @@
 	struct page *page;
 	struct sk_buff *trailer;
 	int tailen = esp->tailen;
+	unsigned int allocsz;
 
-	/* this is non-NULL only with UDP Encapsulation */
+	/* this is non-NULL only with TCP/UDP Encapsulation */
 	if (x->encap) {
-		int err = esp_output_udp_encap(x, skb, esp);
+		int err = esp_output_encap(x, skb, esp);
 
 		if (err < 0)
 			return err;
 	}
 
+	allocsz = ALIGN(skb->data_len + tailen, L1_CACHE_BYTES);
+	if (allocsz > ESP_SKB_FRAG_MAXSIZE)
+		goto cow;
+
 	if (!skb_cloned(skb)) {
 		if (tailen <= skb_tailroom(skb)) {
 			nfrags = 1;
@@ -469,6 +645,9 @@
 	if (sg != dsg)
 		esp_ssg_unref(x, tmp);
 
+	if (!err && x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
+		err = esp_output_tail_tcp(x, skb);
+
 error_free:
 	kfree(tmp);
 error:
@@ -499,7 +678,7 @@
 		struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
 		u32 padto;
 
-		padto = min(x->tfcpad, __xfrm_state_mtu(x, dst->child_mtu_cached));
+		padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached));
 		if (skb->len < padto)
 			esp.tfclen = padto - skb->len;
 	}
@@ -595,7 +774,23 @@
 
 	if (x->encap) {
 		struct xfrm_encap_tmpl *encap = x->encap;
+		struct tcphdr *th = (void *)(skb_network_header(skb) + ihl);
 		struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
+		__be16 source;
+
+		switch (x->encap->encap_type) {
+		case TCP_ENCAP_ESPINTCP:
+			source = th->source;
+			break;
+		case UDP_ENCAP_ESPINUDP:
+		case UDP_ENCAP_ESPINUDP_NON_IKE:
+			source = uh->source;
+			break;
+		default:
+			WARN_ON_ONCE(1);
+			err = -EINVAL;
+			goto out;
+		}
 
 		/*
 		 * 1) if the NAT-T peer's IP or port changed then
@@ -604,11 +799,11 @@
 		 *    SRC ports.
 		 */
 		if (iph->saddr != x->props.saddr.a4 ||
-		    uh->source != encap->encap_sport) {
+		    source != encap->encap_sport) {
 			xfrm_address_t ipaddr;
 
 			ipaddr.a4 = iph->saddr;
-			km_new_mapping(x, &ipaddr, uh->source);
+			km_new_mapping(x, &ipaddr, source);
 
 			/* XXX: perhaps add an extra
 			 * policy check here, to see
@@ -983,6 +1178,14 @@
 		case UDP_ENCAP_ESPINUDP_NON_IKE:
 			x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
 			break;
+#ifdef CONFIG_INET_ESPINTCP
+		case TCP_ENCAP_ESPINTCP:
+			/* only the length field, TCP encap is done by
+			 * the socket
+			 */
+			x->props.header_len += 2;
+			break;
+#endif
 		}
 	}
 
diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index 8c0af30..3450c9b 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -130,6 +130,47 @@
 	return segs;
 }
 
+static struct sk_buff *xfrm4_beet_gso_segment(struct xfrm_state *x,
+					      struct sk_buff *skb,
+					      netdev_features_t features)
+{
+	struct xfrm_offload *xo = xfrm_offload(skb);
+	struct sk_buff *segs = ERR_PTR(-EINVAL);
+	const struct net_offload *ops;
+	u8 proto = xo->proto;
+
+	skb->transport_header += x->props.header_len;
+
+	if (x->sel.family != AF_INET6) {
+		if (proto == IPPROTO_BEETPH) {
+			struct ip_beet_phdr *ph =
+				(struct ip_beet_phdr *)skb->data;
+
+			skb->transport_header += ph->hdrlen * 8;
+			proto = ph->nexthdr;
+		} else {
+			skb->transport_header -= IPV4_BEET_PHMAXLEN;
+		}
+	} else {
+		__be16 frag;
+
+		skb->transport_header +=
+			ipv6_skip_exthdr(skb, 0, &proto, &frag);
+		if (proto == IPPROTO_TCP)
+			skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
+	}
+
+	if (proto == IPPROTO_IPV6)
+		skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
+
+	__skb_pull(skb, skb_transport_offset(skb));
+	ops = rcu_dereference(inet_offloads[proto]);
+	if (likely(ops && ops->callbacks.gso_segment))
+		segs = ops->callbacks.gso_segment(skb, features);
+
+	return segs;
+}
+
 static struct sk_buff *xfrm4_outer_mode_gso_segment(struct xfrm_state *x,
 						    struct sk_buff *skb,
 						    netdev_features_t features)
@@ -139,6 +180,8 @@
 		return xfrm4_tunnel_gso_segment(x, skb, features);
 	case XFRM_MODE_TRANSPORT:
 		return xfrm4_transport_gso_segment(x, skb, features);
+	case XFRM_MODE_BEET:
+		return xfrm4_beet_gso_segment(x, skb, features);
 	}
 
 	return ERR_PTR(-EOPNOTSUPP);
@@ -274,8 +317,17 @@
 	ip_hdr(skb)->tot_len = htons(skb->len);
 	ip_send_check(ip_hdr(skb));
 
-	if (hw_offload)
+	if (hw_offload) {
+		if (!skb_ext_add(skb, SKB_EXT_SEC_PATH))
+			return -ENOMEM;
+
+		xo = xfrm_offload(skb);
+		if (!xo)
+			return -EINVAL;
+
+		xo->flags |= XFRM_XMIT;
 		return 0;
+	}
 
 	err = esp_output_tail(x, skb, &esp);
 	if (err)
@@ -323,3 +375,4 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
 MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET, XFRM_PROTO_ESP);
+MODULE_DESCRIPTION("IPV4 GSO/GRO offload support");
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index b875b98..917ea95 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -70,11 +70,6 @@
 	fib_free_table(main_table);
 	return -ENOMEM;
 }
-
-static bool fib4_has_custom_rules(struct net *net)
-{
-	return false;
-}
 #else
 
 struct fib_table *fib_new_table(struct net *net, u32 id)
@@ -131,11 +126,6 @@
 	}
 	return NULL;
 }
-
-static bool fib4_has_custom_rules(struct net *net)
-{
-	return net->ipv4.fib_has_custom_rules;
-}
 #endif /* CONFIG_IP_MULTIPLE_TABLES */
 
 static void fib_replace_table(struct net *net, struct fib_table *old,
@@ -1588,7 +1578,7 @@
 	int error;
 
 #ifdef CONFIG_IP_ROUTE_CLASSID
-	net->ipv4.fib_num_tclassid_users = 0;
+	atomic_set(&net->ipv4.fib_num_tclassid_users, 0);
 #endif
 	error = ip_fib_net_init(net);
 	if (error < 0)
diff --git a/net/ipv4/fib_lookup.h b/net/ipv4/fib_lookup.h
index a68b5e2..818916b 100644
--- a/net/ipv4/fib_lookup.h
+++ b/net/ipv4/fib_lookup.h
@@ -16,6 +16,9 @@
 	u8			fa_slen;
 	u32			tb_id;
 	s16			fa_default;
+	u8			offload:1,
+				trap:1,
+				unused:6;
 	struct rcu_head		rcu;
 };
 
@@ -32,12 +35,11 @@
 void fib_release_info(struct fib_info *);
 struct fib_info *fib_create_info(struct fib_config *cfg,
 				 struct netlink_ext_ack *extack);
-int fib_nh_match(struct fib_config *cfg, struct fib_info *fi,
+int fib_nh_match(struct net *net, struct fib_config *cfg, struct fib_info *fi,
 		 struct netlink_ext_ack *extack);
 bool fib_metrics_match(struct fib_config *cfg, struct fib_info *fi);
-int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event, u32 tb_id,
-		  u8 type, __be32 dst, int dst_len, u8 tos, struct fib_info *fi,
-		  unsigned int);
+int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
+		  struct fib_rt_info *fri, unsigned int flags);
 void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, int dst_len,
 	       u32 tb_id, const struct nl_info *info, unsigned int nlm_flags);
 
diff --git a/net/ipv4/fib_notifier.c b/net/ipv4/fib_notifier.c
index b804ccb..0c28bd4 100644
--- a/net/ipv4/fib_notifier.c
+++ b/net/ipv4/fib_notifier.c
@@ -9,12 +9,12 @@
 #include <net/netns/ipv4.h>
 #include <net/ip_fib.h>
 
-int call_fib4_notifier(struct notifier_block *nb, struct net *net,
+int call_fib4_notifier(struct notifier_block *nb,
 		       enum fib_event_type event_type,
 		       struct fib_notifier_info *info)
 {
 	info->family = AF_INET;
-	return call_fib_notifier(nb, net, event_type, info);
+	return call_fib_notifier(nb, event_type, info);
 }
 
 int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
@@ -34,17 +34,16 @@
 	return net->ipv4.fib_seq + fib4_rules_seq_read(net);
 }
 
-static int fib4_dump(struct net *net, struct notifier_block *nb)
+static int fib4_dump(struct net *net, struct notifier_block *nb,
+		     struct netlink_ext_ack *extack)
 {
 	int err;
 
-	err = fib4_rules_dump(net, nb);
+	err = fib4_rules_dump(net, nb, extack);
 	if (err)
 		return err;
 
-	fib_notify(net, nb);
-
-	return 0;
+	return fib_notify(net, nb, extack);
 }
 
 static const struct fib_notifier_ops fib4_notifier_ops_template = {
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index b43a7ba..d279cb8 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -29,6 +29,7 @@
 #include <net/ip_fib.h>
 #include <net/nexthop.h>
 #include <net/fib_rules.h>
+#include <linux/indirect_call_wrapper.h>
 
 struct fib4_rule {
 	struct fib_rule		common;
@@ -65,9 +66,10 @@
 }
 EXPORT_SYMBOL_GPL(fib4_rule_default);
 
-int fib4_rules_dump(struct net *net, struct notifier_block *nb)
+int fib4_rules_dump(struct net *net, struct notifier_block *nb,
+		    struct netlink_ext_ack *extack)
 {
-	return fib_rules_dump(net, nb, AF_INET);
+	return fib_rules_dump(net, nb, AF_INET, extack);
 }
 
 unsigned int fib4_rules_seq_read(struct net *net)
@@ -102,8 +104,9 @@
 }
 EXPORT_SYMBOL_GPL(__fib_lookup);
 
-static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
-			    int flags, struct fib_lookup_arg *arg)
+INDIRECT_CALLABLE_SCOPE int fib4_rule_action(struct fib_rule *rule,
+					     struct flowi *flp, int flags,
+					     struct fib_lookup_arg *arg)
 {
 	int err = -EAGAIN;
 	struct fib_table *tbl;
@@ -137,7 +140,9 @@
 	return err;
 }
 
-static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
+INDIRECT_CALLABLE_SCOPE bool fib4_rule_suppress(struct fib_rule *rule,
+						int flags,
+						struct fib_lookup_arg *arg)
 {
 	struct fib_result *result = (struct fib_result *) arg->result;
 	struct net_device *dev = NULL;
@@ -168,7 +173,8 @@
 	return true;
 }
 
-static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
+INDIRECT_CALLABLE_SCOPE int fib4_rule_match(struct fib_rule *rule,
+					    struct flowi *fl, int flags)
 {
 	struct fib4_rule *r = (struct fib4_rule *) rule;
 	struct flowi4 *fl4 = &fl->u.ip4;
@@ -258,7 +264,7 @@
 	if (tb[FRA_FLOW]) {
 		rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
 		if (rule4->tclassid)
-			net->ipv4.fib_num_tclassid_users++;
+			atomic_inc(&net->ipv4.fib_num_tclassid_users);
 	}
 #endif
 
@@ -290,7 +296,7 @@
 
 #ifdef CONFIG_IP_ROUTE_CLASSID
 	if (((struct fib4_rule *)rule)->tclassid)
-		net->ipv4.fib_num_tclassid_users--;
+		atomic_dec(&net->ipv4.fib_num_tclassid_users);
 #endif
 	net->ipv4.fib_has_custom_rules = true;
 
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index b1b3220..838a876 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -29,6 +29,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/netlink.h>
+#include <linux/hash.h>
 
 #include <net/arp.h>
 #include <net/ip.h>
@@ -222,7 +223,7 @@
 {
 #ifdef CONFIG_IP_ROUTE_CLASSID
 	if (fib_nh->nh_tclassid)
-		net->ipv4.fib_num_tclassid_users--;
+		atomic_dec(&net->ipv4.fib_num_tclassid_users);
 #endif
 	fib_nh_common_release(&fib_nh->nh_common);
 }
@@ -251,7 +252,6 @@
 		pr_warn("Freeing alive fib_info %p\n", fi);
 		return;
 	}
-	fib_info_cnt--;
 
 	call_rcu(&fi->rcu, free_fib_info_rcu);
 }
@@ -262,6 +262,10 @@
 	spin_lock_bh(&fib_info_lock);
 	if (fi && --fi->fib_treeref == 0) {
 		hlist_del(&fi->fib_hash);
+
+		/* Paired with READ_ONCE() in fib_create_info(). */
+		WRITE_ONCE(fib_info_cnt, fib_info_cnt - 1);
+
 		if (fi->fib_prefsrc)
 			hlist_del(&fi->fib_lhash);
 		if (fi->nh) {
@@ -318,11 +322,15 @@
 
 static inline unsigned int fib_devindex_hashfn(unsigned int val)
 {
-	unsigned int mask = DEVINDEX_HASHSIZE - 1;
+	return hash_32(val, DEVINDEX_HASHBITS);
+}
 
-	return (val ^
-		(val >> DEVINDEX_HASHBITS) ^
-		(val >> (DEVINDEX_HASHBITS * 2))) & mask;
+static struct hlist_head *
+fib_info_devhash_bucket(const struct net_device *dev)
+{
+	u32 val = net_hash_mix(dev_net(dev)) ^ dev->ifindex;
+
+	return &fib_info_devhash[fib_devindex_hashfn(val)];
 }
 
 static unsigned int fib_info_hashfn_1(int init_val, u8 protocol, u8 scope,
@@ -432,12 +440,11 @@
 {
 	struct hlist_head *head;
 	struct fib_nh *nh;
-	unsigned int hash;
 
 	spin_lock(&fib_info_lock);
 
-	hash = fib_devindex_hashfn(dev->ifindex);
-	head = &fib_info_devhash[hash];
+	head = fib_info_devhash_bucket(dev);
+
 	hlist_for_each_entry(nh, head, nh_hash) {
 		if (nh->fib_nh_dev == dev &&
 		    nh->fib_nh_gw4 == gw &&
@@ -504,6 +511,7 @@
 	       int dst_len, u32 tb_id, const struct nl_info *info,
 	       unsigned int nlm_flags)
 {
+	struct fib_rt_info fri;
 	struct sk_buff *skb;
 	u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
 	int err = -ENOBUFS;
@@ -512,9 +520,15 @@
 	if (!skb)
 		goto errout;
 
-	err = fib_dump_info(skb, info->portid, seq, event, tb_id,
-			    fa->fa_type, key, dst_len,
-			    fa->fa_tos, fa->fa_info, nlm_flags);
+	fri.fi = fa->fa_info;
+	fri.tb_id = tb_id;
+	fri.dst = key;
+	fri.dst_len = dst_len;
+	fri.tos = fa->fa_tos;
+	fri.type = fa->fa_type;
+	fri.offload = fa->offload;
+	fri.trap = fa->trap;
+	err = fib_dump_info(skb, info->portid, seq, event, &fri, nlm_flags);
 	if (err < 0) {
 		/* -EMSGSIZE implies BUG in fib_nlmsg_size() */
 		WARN_ON(err == -EMSGSIZE);
@@ -563,8 +577,9 @@
 	return 1;
 }
 
-int fib_nh_common_init(struct fib_nh_common *nhc, struct nlattr *encap,
-		       u16 encap_type, void *cfg, gfp_t gfp_flags,
+int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc,
+		       struct nlattr *encap, u16 encap_type,
+		       void *cfg, gfp_t gfp_flags,
 		       struct netlink_ext_ack *extack)
 {
 	int err;
@@ -582,8 +597,9 @@
 			err = -EINVAL;
 			goto lwt_failure;
 		}
-		err = lwtunnel_build_state(encap_type, encap, nhc->nhc_family,
-					   cfg, &lwtstate, extack);
+		err = lwtunnel_build_state(net, encap_type, encap,
+					   nhc->nhc_family, cfg, &lwtstate,
+					   extack);
 		if (err)
 			goto lwt_failure;
 
@@ -607,7 +623,7 @@
 
 	nh->fib_nh_family = AF_INET;
 
-	err = fib_nh_common_init(&nh->nh_common, cfg->fc_encap,
+	err = fib_nh_common_init(net, &nh->nh_common, cfg->fc_encap,
 				 cfg->fc_encap_type, cfg, GFP_KERNEL, extack);
 	if (err)
 		return err;
@@ -624,7 +640,7 @@
 #ifdef CONFIG_IP_ROUTE_CLASSID
 	nh->nh_tclassid = cfg->fc_flow;
 	if (nh->nh_tclassid)
-		net->ipv4.fib_num_tclassid_users++;
+		atomic_inc(&net->ipv4.fib_num_tclassid_users);
 #endif
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 	nh->fib_nh_weight = nh_weight;
@@ -654,6 +670,19 @@
 	return nhs;
 }
 
+static int fib_gw_from_attr(__be32 *gw, struct nlattr *nla,
+			    struct netlink_ext_ack *extack)
+{
+	if (nla_len(nla) < sizeof(*gw)) {
+		NL_SET_ERR_MSG(extack, "Invalid IPv4 address in RTA_GATEWAY");
+		return -EINVAL;
+	}
+
+	*gw = nla_get_in_addr(nla);
+
+	return 0;
+}
+
 /* only called when fib_nh is integrated into fib_info */
 static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
 		       int remaining, struct fib_config *cfg,
@@ -696,7 +725,11 @@
 				return -EINVAL;
 			}
 			if (nla) {
-				fib_cfg.fc_gw4 = nla_get_in_addr(nla);
+				ret = fib_gw_from_attr(&fib_cfg.fc_gw4, nla,
+						       extack);
+				if (ret)
+					goto errout;
+
 				if (fib_cfg.fc_gw4)
 					fib_cfg.fc_gw_family = AF_INET;
 			} else if (nlav) {
@@ -706,10 +739,18 @@
 			}
 
 			nla = nla_find(attrs, attrlen, RTA_FLOW);
-			if (nla)
+			if (nla) {
+				if (nla_len(nla) < sizeof(u32)) {
+					NL_SET_ERR_MSG(extack, "Invalid RTA_FLOW");
+					return -EINVAL;
+				}
 				fib_cfg.fc_flow = nla_get_u32(nla);
+			}
 
 			fib_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
+			/* RTA_ENCAP_TYPE length checked in
+			 * lwtunnel_valid_encap_type_attr
+			 */
 			nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
 			if (nla)
 				fib_cfg.fc_encap_type = nla_get_u16(nla);
@@ -807,7 +848,7 @@
 
 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
 
-static int fib_encap_match(u16 encap_type,
+static int fib_encap_match(struct net *net, u16 encap_type,
 			   struct nlattr *encap,
 			   const struct fib_nh *nh,
 			   const struct fib_config *cfg,
@@ -819,7 +860,7 @@
 	if (encap_type == LWTUNNEL_ENCAP_NONE)
 		return 0;
 
-	ret = lwtunnel_build_state(encap_type, encap, AF_INET,
+	ret = lwtunnel_build_state(net, encap_type, encap, AF_INET,
 				   cfg, &lwtstate, extack);
 	if (!ret) {
 		result = lwtunnel_cmp_encap(lwtstate, nh->fib_nh_lws);
@@ -829,7 +870,7 @@
 	return result;
 }
 
-int fib_nh_match(struct fib_config *cfg, struct fib_info *fi,
+int fib_nh_match(struct net *net, struct fib_config *cfg, struct fib_info *fi,
 		 struct netlink_ext_ack *extack)
 {
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
@@ -850,8 +891,8 @@
 		struct fib_nh *nh = fib_info_nh(fi, 0);
 
 		if (cfg->fc_encap) {
-			if (fib_encap_match(cfg->fc_encap_type, cfg->fc_encap,
-					    nh, cfg, extack))
+			if (fib_encap_match(net, cfg->fc_encap_type,
+					    cfg->fc_encap, nh, cfg, extack))
 				return 1;
 		}
 #ifdef CONFIG_IP_ROUTE_CLASSID
@@ -894,6 +935,7 @@
 		attrlen = rtnh_attrlen(rtnh);
 		if (attrlen > 0) {
 			struct nlattr *nla, *nlav, *attrs = rtnh_attrs(rtnh);
+			int err;
 
 			nla = nla_find(attrs, attrlen, RTA_GATEWAY);
 			nlav = nla_find(attrs, attrlen, RTA_VIA);
@@ -904,12 +946,17 @@
 			}
 
 			if (nla) {
+				__be32 gw;
+
+				err = fib_gw_from_attr(&gw, nla, extack);
+				if (err)
+					return err;
+
 				if (nh->fib_nh_gw_family != AF_INET ||
-				    nla_get_in_addr(nla) != nh->fib_nh_gw4)
+				    gw != nh->fib_nh_gw4)
 					return 1;
 			} else if (nlav) {
 				struct fib_config cfg2;
-				int err;
 
 				err = fib_gw_from_via(&cfg2, nlav, extack);
 				if (err)
@@ -932,8 +979,14 @@
 
 #ifdef CONFIG_IP_ROUTE_CLASSID
 			nla = nla_find(attrs, attrlen, RTA_FLOW);
-			if (nla && nla_get_u32(nla) != nh->nh_tclassid)
-				return 1;
+			if (nla) {
+				if (nla_len(nla) < sizeof(u32)) {
+					NL_SET_ERR_MSG(extack, "Invalid RTA_FLOW");
+					return -EINVAL;
+				}
+				if (nla_get_u32(nla) != nh->nh_tclassid)
+					return 1;
+			}
 #endif
 		}
 
@@ -1385,7 +1438,9 @@
 #endif
 
 	err = -ENOBUFS;
-	if (fib_info_cnt >= fib_info_hash_size) {
+
+	/* Paired with WRITE_ONCE() in fib_release_info() */
+	if (READ_ONCE(fib_info_cnt) >= fib_info_hash_size) {
 		unsigned int new_size = fib_info_hash_size << 1;
 		struct hlist_head *new_info_hash;
 		struct hlist_head *new_laddrhash;
@@ -1417,7 +1472,6 @@
 		return ERR_PTR(err);
 	}
 
-	fib_info_cnt++;
 	fi->fib_net = net;
 	fi->fib_protocol = cfg->fc_protocol;
 	fi->fib_scope = cfg->fc_scope;
@@ -1544,6 +1598,7 @@
 	fi->fib_treeref++;
 	refcount_set(&fi->fib_clntref, 1);
 	spin_lock_bh(&fib_info_lock);
+	fib_info_cnt++;
 	hlist_add_head(&fi->fib_hash,
 		       &fib_info_hash[fib_info_hashfn(fi)]);
 	if (fi->fib_prefsrc) {
@@ -1557,12 +1612,10 @@
 	} else {
 		change_nexthops(fi) {
 			struct hlist_head *head;
-			unsigned int hash;
 
 			if (!nexthop_nh->fib_nh_dev)
 				continue;
-			hash = fib_devindex_hashfn(nexthop_nh->fib_nh_dev->ifindex);
-			head = &fib_info_devhash[hash];
+			head = fib_info_devhash_bucket(nexthop_nh->fib_nh_dev);
 			hlist_add_head(&nexthop_nh->nh_hash, head);
 		} endfor_nexthops(fi)
 	}
@@ -1654,7 +1707,7 @@
 
 #if IS_ENABLED(CONFIG_IP_ROUTE_MULTIPATH) || IS_ENABLED(CONFIG_IPV6)
 int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc,
-		    int nh_weight, u8 rt_family)
+		    int nh_weight, u8 rt_family, u32 nh_tclassid)
 {
 	const struct net_device *dev = nhc->nhc_dev;
 	struct rtnexthop *rtnh;
@@ -1672,6 +1725,9 @@
 
 	rtnh->rtnh_flags = flags;
 
+	if (nh_tclassid && nla_put_u32(skb, RTA_FLOW, nh_tclassid))
+		goto nla_put_failure;
+
 	/* length of rtnetlink header + attributes */
 	rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
 
@@ -1699,14 +1755,13 @@
 	}
 
 	for_nexthops(fi) {
-		if (fib_add_nexthop(skb, &nh->nh_common, nh->fib_nh_weight,
-				    AF_INET) < 0)
-			goto nla_put_failure;
+		u32 nh_tclassid = 0;
 #ifdef CONFIG_IP_ROUTE_CLASSID
-		if (nh->nh_tclassid &&
-		    nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid))
-			goto nla_put_failure;
+		nh_tclassid = nh->nh_tclassid;
 #endif
+		if (fib_add_nexthop(skb, &nh->nh_common, nh->fib_nh_weight,
+				    AF_INET, nh_tclassid) < 0)
+			goto nla_put_failure;
 	} endfor_nexthops(fi);
 
 mp_end:
@@ -1725,10 +1780,11 @@
 #endif
 
 int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
-		  u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos,
-		  struct fib_info *fi, unsigned int flags)
+		  struct fib_rt_info *fri, unsigned int flags)
 {
-	unsigned int nhs = fib_info_num_path(fi);
+	unsigned int nhs = fib_info_num_path(fri->fi);
+	struct fib_info *fi = fri->fi;
+	u32 tb_id = fri->tb_id;
 	struct nlmsghdr *nlh;
 	struct rtmsg *rtm;
 
@@ -1738,22 +1794,22 @@
 
 	rtm = nlmsg_data(nlh);
 	rtm->rtm_family = AF_INET;
-	rtm->rtm_dst_len = dst_len;
+	rtm->rtm_dst_len = fri->dst_len;
 	rtm->rtm_src_len = 0;
-	rtm->rtm_tos = tos;
+	rtm->rtm_tos = fri->tos;
 	if (tb_id < 256)
 		rtm->rtm_table = tb_id;
 	else
 		rtm->rtm_table = RT_TABLE_COMPAT;
 	if (nla_put_u32(skb, RTA_TABLE, tb_id))
 		goto nla_put_failure;
-	rtm->rtm_type = type;
+	rtm->rtm_type = fri->type;
 	rtm->rtm_flags = fi->fib_flags;
 	rtm->rtm_scope = fi->fib_scope;
 	rtm->rtm_protocol = fi->fib_protocol;
 
 	if (rtm->rtm_dst_len &&
-	    nla_put_in_addr(skb, RTA_DST, dst))
+	    nla_put_in_addr(skb, RTA_DST, fri->dst))
 		goto nla_put_failure;
 	if (fi->fib_priority &&
 	    nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority))
@@ -1770,6 +1826,8 @@
 			goto nla_put_failure;
 		if (nexthop_is_blackhole(fi->nh))
 			rtm->rtm_type = RTN_BLACKHOLE;
+		if (!fi->fib_net->ipv4.sysctl_nexthop_compat_mode)
+			goto offload;
 	}
 
 	if (nhs == 1) {
@@ -1795,6 +1853,12 @@
 			goto nla_put_failure;
 	}
 
+offload:
+	if (fri->offload)
+		rtm->rtm_flags |= RTM_F_OFFLOAD;
+	if (fri->trap)
+		rtm->rtm_flags |= RTM_F_TRAP;
+
 	nlmsg_end(skb, nlh);
 	return 0;
 
@@ -1901,8 +1965,7 @@
 
 void fib_sync_mtu(struct net_device *dev, u32 orig_mtu)
 {
-	unsigned int hash = fib_devindex_hashfn(dev->ifindex);
-	struct hlist_head *head = &fib_info_devhash[hash];
+	struct hlist_head *head = fib_info_devhash_bucket(dev);
 	struct fib_nh *nh;
 
 	hlist_for_each_entry(nh, head, nh_hash) {
@@ -1921,12 +1984,11 @@
  */
 int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force)
 {
-	int ret = 0;
-	int scope = RT_SCOPE_NOWHERE;
+	struct hlist_head *head = fib_info_devhash_bucket(dev);
 	struct fib_info *prev_fi = NULL;
-	unsigned int hash = fib_devindex_hashfn(dev->ifindex);
-	struct hlist_head *head = &fib_info_devhash[hash];
+	int scope = RT_SCOPE_NOWHERE;
 	struct fib_nh *nh;
+	int ret = 0;
 
 	if (force)
 		scope = -1;
@@ -1949,7 +2011,7 @@
 				case NETDEV_DOWN:
 				case NETDEV_UNREGISTER:
 					nexthop_nh->fib_nh_flags |= RTNH_F_DEAD;
-					/* fall through */
+					fallthrough;
 				case NETDEV_CHANGE:
 					nexthop_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
 					break;
@@ -1971,7 +2033,7 @@
 			case NETDEV_DOWN:
 			case NETDEV_UNREGISTER:
 				fi->fib_flags |= RTNH_F_DEAD;
-				/* fall through */
+				fallthrough;
 			case NETDEV_CHANGE:
 				fi->fib_flags |= RTNH_F_LINKDOWN;
 				break;
@@ -2071,7 +2133,6 @@
 int fib_sync_up(struct net_device *dev, unsigned char nh_flags)
 {
 	struct fib_info *prev_fi;
-	unsigned int hash;
 	struct hlist_head *head;
 	struct fib_nh *nh;
 	int ret;
@@ -2087,8 +2148,7 @@
 	}
 
 	prev_fi = NULL;
-	hash = fib_devindex_hashfn(dev->ifindex);
-	head = &fib_info_devhash[hash];
+	head = fib_info_devhash_bucket(dev);
 	ret = 0;
 
 	hlist_for_each_entry(nh, head, nh_hash) {
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 51673d0..ffc5332 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -13,7 +13,7 @@
  *
  * An experimental study of compression methods for dynamic tries
  * Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002.
- * http://www.csc.kth.se/~snilsson/software/dyntrie2/
+ * https://www.csc.kth.se/~snilsson/software/dyntrie2/
  *
  * IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson
  * IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999
@@ -35,9 +35,6 @@
  *		Paul E. McKenney <paulmck@us.ibm.com>
  *		Patrick McHardy <kaber@trash.net>
  */
-
-#define VERSION "0.409"
-
 #include <linux/cache.h>
 #include <linux/uaccess.h>
 #include <linux/bitops.h>
@@ -74,11 +71,13 @@
 #include <trace/events/fib.h>
 #include "fib_lookup.h"
 
-static int call_fib_entry_notifier(struct notifier_block *nb, struct net *net,
+static int call_fib_entry_notifier(struct notifier_block *nb,
 				   enum fib_event_type event_type, u32 dst,
-				   int dst_len, struct fib_alias *fa)
+				   int dst_len, struct fib_alias *fa,
+				   struct netlink_ext_ack *extack)
 {
 	struct fib_entry_notifier_info info = {
+		.info.extack = extack,
 		.dst = dst,
 		.dst_len = dst_len,
 		.fi = fa->fa_info,
@@ -86,7 +85,7 @@
 		.type = fa->fa_type,
 		.tb_id = fa->tb_id,
 	};
-	return call_fib4_notifier(nb, net, event_type, &info.info);
+	return call_fib4_notifier(nb, event_type, &info.info);
 }
 
 static int call_fib_entry_notifiers(struct net *net,
@@ -302,8 +301,6 @@
 	call_rcu(&fa->rcu, __alias_free_mem);
 }
 
-#define TNODE_KMALLOC_MAX \
-	ilog2((PAGE_SIZE - TNODE_SIZE(0)) / sizeof(struct key_vector *))
 #define TNODE_VMALLOC_MAX \
 	ilog2((SIZE_MAX - TNODE_SIZE(0)) / sizeof(struct key_vector *))
 
@@ -978,9 +975,12 @@
 
 /* Return the first fib alias matching TOS with
  * priority less than or equal to PRIO.
+ * If 'find_first' is set, return the first matching
+ * fib alias, regardless of TOS and priority.
  */
 static struct fib_alias *fib_find_alias(struct hlist_head *fah, u8 slen,
-					u8 tos, u32 prio, u32 tb_id)
+					u8 tos, u32 prio, u32 tb_id,
+					bool find_first)
 {
 	struct fib_alias *fa;
 
@@ -996,6 +996,8 @@
 			continue;
 		if (fa->tb_id != tb_id)
 			break;
+		if (find_first)
+			return fa;
 		if (fa->fa_tos > tos)
 			continue;
 		if (fa->fa_info->fib_priority >= prio || fa->fa_tos < tos)
@@ -1005,6 +1007,52 @@
 	return NULL;
 }
 
+static struct fib_alias *
+fib_find_matching_alias(struct net *net, const struct fib_rt_info *fri)
+{
+	u8 slen = KEYLENGTH - fri->dst_len;
+	struct key_vector *l, *tp;
+	struct fib_table *tb;
+	struct fib_alias *fa;
+	struct trie *t;
+
+	tb = fib_get_table(net, fri->tb_id);
+	if (!tb)
+		return NULL;
+
+	t = (struct trie *)tb->tb_data;
+	l = fib_find_node(t, &tp, be32_to_cpu(fri->dst));
+	if (!l)
+		return NULL;
+
+	hlist_for_each_entry_rcu(fa, &l->leaf, fa_list) {
+		if (fa->fa_slen == slen && fa->tb_id == fri->tb_id &&
+		    fa->fa_tos == fri->tos && fa->fa_info == fri->fi &&
+		    fa->fa_type == fri->type)
+			return fa;
+	}
+
+	return NULL;
+}
+
+void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri)
+{
+	struct fib_alias *fa_match;
+
+	rcu_read_lock();
+
+	fa_match = fib_find_matching_alias(net, fri);
+	if (!fa_match)
+		goto out;
+
+	fa_match->offload = fri->offload;
+	fa_match->trap = fri->trap;
+
+out:
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(fib_alias_hw_flags_set);
+
 static void trie_rebalance(struct trie *t, struct key_vector *tn)
 {
 	while (!IS_TRIE(tn))
@@ -1061,9 +1109,6 @@
 	return -ENOMEM;
 }
 
-/* fib notifier for ADD is sent before calling fib_insert_alias with
- * the expectation that the only possible failure ENOMEM
- */
 static int fib_insert_alias(struct trie *t, struct key_vector *tp,
 			    struct key_vector *l, struct fib_alias *new,
 			    struct fib_alias *fa, t_key key)
@@ -1116,11 +1161,13 @@
 	return true;
 }
 
+static void fib_remove_alias(struct trie *t, struct key_vector *tp,
+			     struct key_vector *l, struct fib_alias *old);
+
 /* Caller must hold RTNL. */
 int fib_table_insert(struct net *net, struct fib_table *tb,
 		     struct fib_config *cfg, struct netlink_ext_ack *extack)
 {
-	enum fib_event_type event = FIB_EVENT_ENTRY_ADD;
 	struct trie *t = (struct trie *)tb->tb_data;
 	struct fib_alias *fa, *new_fa;
 	struct key_vector *l, *tp;
@@ -1147,7 +1194,7 @@
 
 	l = fib_find_node(t, &tp, key);
 	fa = l ? fib_find_alias(&l->leaf, slen, tos, fi->fib_priority,
-				tb->tb_id) : NULL;
+				tb->tb_id, false) : NULL;
 
 	/* Now fa, if non-NULL, points to the first fib alias
 	 * with the same keys [prefix,tos,priority], if such key already
@@ -1214,19 +1261,29 @@
 			new_fa->fa_slen = fa->fa_slen;
 			new_fa->tb_id = tb->tb_id;
 			new_fa->fa_default = -1;
+			new_fa->offload = 0;
+			new_fa->trap = 0;
 
-			err = call_fib_entry_notifiers(net,
-						       FIB_EVENT_ENTRY_REPLACE,
-						       key, plen, new_fa,
-						       extack);
-			if (err)
-				goto out_free_new_fa;
+			hlist_replace_rcu(&fa->fa_list, &new_fa->fa_list);
+
+			if (fib_find_alias(&l->leaf, fa->fa_slen, 0, 0,
+					   tb->tb_id, true) == new_fa) {
+				enum fib_event_type fib_event;
+
+				fib_event = FIB_EVENT_ENTRY_REPLACE;
+				err = call_fib_entry_notifiers(net, fib_event,
+							       key, plen,
+							       new_fa, extack);
+				if (err) {
+					hlist_replace_rcu(&new_fa->fa_list,
+							  &fa->fa_list);
+					goto out_free_new_fa;
+				}
+			}
 
 			rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen,
 				  tb->tb_id, &cfg->fc_nlinfo, nlflags);
 
-			hlist_replace_rcu(&fa->fa_list, &new_fa->fa_list);
-
 			alias_free_mem_rcu(fa);
 
 			fib_release_info(fi_drop);
@@ -1242,12 +1299,10 @@
 		if (fa_match)
 			goto out;
 
-		if (cfg->fc_nlflags & NLM_F_APPEND) {
-			event = FIB_EVENT_ENTRY_APPEND;
+		if (cfg->fc_nlflags & NLM_F_APPEND)
 			nlflags |= NLM_F_APPEND;
-		} else {
+		else
 			fa = fa_first;
-		}
 	}
 	err = -ENOENT;
 	if (!(cfg->fc_nlflags & NLM_F_CREATE))
@@ -1266,15 +1321,29 @@
 	new_fa->fa_slen = slen;
 	new_fa->tb_id = tb->tb_id;
 	new_fa->fa_default = -1;
-
-	err = call_fib_entry_notifiers(net, event, key, plen, new_fa, extack);
-	if (err)
-		goto out_free_new_fa;
+	new_fa->offload = 0;
+	new_fa->trap = 0;
 
 	/* Insert new entry to the list. */
 	err = fib_insert_alias(t, tp, l, new_fa, fa, key);
 	if (err)
-		goto out_fib_notif;
+		goto out_free_new_fa;
+
+	/* The alias was already inserted, so the node must exist. */
+	l = l ? l : fib_find_node(t, &tp, key);
+	if (WARN_ON_ONCE(!l))
+		goto out_free_new_fa;
+
+	if (fib_find_alias(&l->leaf, new_fa->fa_slen, 0, 0, tb->tb_id, true) ==
+	    new_fa) {
+		enum fib_event_type fib_event;
+
+		fib_event = FIB_EVENT_ENTRY_REPLACE;
+		err = call_fib_entry_notifiers(net, fib_event, key, plen,
+					       new_fa, extack);
+		if (err)
+			goto out_remove_new_fa;
+	}
 
 	if (!plen)
 		tb->tb_num_default++;
@@ -1285,14 +1354,8 @@
 succeeded:
 	return 0;
 
-out_fib_notif:
-	/* notifier was sent that entry would be added to trie, but
-	 * the add failed and need to recover. Only failure for
-	 * fib_insert_alias is ENOMEM.
-	 */
-	NL_SET_ERR_MSG(extack, "Failed to insert route into trie");
-	call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, key,
-				 plen, new_fa, NULL);
+out_remove_new_fa:
+	fib_remove_alias(t, tp, l, new_fa);
 out_free_new_fa:
 	kmem_cache_free(fn_alias_kmem, new_fa);
 out:
@@ -1308,6 +1371,26 @@
 	return (key ^ prefix) & (prefix | -prefix);
 }
 
+bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags,
+			 const struct flowi4 *flp)
+{
+	if (nhc->nhc_flags & RTNH_F_DEAD)
+		return false;
+
+	if (ip_ignore_linkdown(nhc->nhc_dev) &&
+	    nhc->nhc_flags & RTNH_F_LINKDOWN &&
+	    !(fib_flags & FIB_LOOKUP_IGNORE_LINKSTATE))
+		return false;
+
+	if (!(flp->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF)) {
+		if (flp->flowi4_oif &&
+		    flp->flowi4_oif != nhc->nhc_oif)
+			return false;
+	}
+
+	return true;
+}
+
 /* should be called with rcu_read_lock */
 int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
 		     struct fib_result *res, int fib_flags)
@@ -1440,6 +1523,7 @@
 	/* Step 3: Process the leaf, if that fails fall back to backtracing */
 	hlist_for_each_entry_rcu(fa, &n->leaf, fa_list) {
 		struct fib_info *fi = fa->fa_info;
+		struct fib_nh_common *nhc;
 		int nhsel, err;
 
 		if ((BITS_PER_LONG > KEYLENGTH) || (fa->fa_slen < KEYLENGTH)) {
@@ -1465,26 +1549,25 @@
 		if (fi->fib_flags & RTNH_F_DEAD)
 			continue;
 
-		if (unlikely(fi->nh && nexthop_is_blackhole(fi->nh))) {
-			err = fib_props[RTN_BLACKHOLE].error;
-			goto out_reject;
+		if (unlikely(fi->nh)) {
+			if (nexthop_is_blackhole(fi->nh)) {
+				err = fib_props[RTN_BLACKHOLE].error;
+				goto out_reject;
+			}
+
+			nhc = nexthop_get_nhc_lookup(fi->nh, fib_flags, flp,
+						     &nhsel);
+			if (nhc)
+				goto set_result;
+			goto miss;
 		}
 
 		for (nhsel = 0; nhsel < fib_info_num_path(fi); nhsel++) {
-			struct fib_nh_common *nhc = fib_info_nhc(fi, nhsel);
+			nhc = fib_info_nhc(fi, nhsel);
 
-			if (nhc->nhc_flags & RTNH_F_DEAD)
+			if (!fib_lookup_good_nhc(nhc, fib_flags, flp))
 				continue;
-			if (ip_ignore_linkdown(nhc->nhc_dev) &&
-			    nhc->nhc_flags & RTNH_F_LINKDOWN &&
-			    !(fib_flags & FIB_LOOKUP_IGNORE_LINKSTATE))
-				continue;
-			if (!(flp->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF)) {
-				if (flp->flowi4_oif &&
-				    flp->flowi4_oif != nhc->nhc_oif)
-					continue;
-			}
-
+set_result:
 			if (!(fib_flags & FIB_LOOKUP_NOREF))
 				refcount_inc(&fi->fib_clntref);
 
@@ -1505,6 +1588,7 @@
 			return err;
 		}
 	}
+miss:
 #ifdef CONFIG_IP_FIB_TRIE_STATS
 	this_cpu_inc(stats->semantic_match_miss);
 #endif
@@ -1543,6 +1627,36 @@
 	node_pull_suffix(tp, fa->fa_slen);
 }
 
+static void fib_notify_alias_delete(struct net *net, u32 key,
+				    struct hlist_head *fah,
+				    struct fib_alias *fa_to_delete,
+				    struct netlink_ext_ack *extack)
+{
+	struct fib_alias *fa_next, *fa_to_notify;
+	u32 tb_id = fa_to_delete->tb_id;
+	u8 slen = fa_to_delete->fa_slen;
+	enum fib_event_type fib_event;
+
+	/* Do not notify if we do not care about the route. */
+	if (fib_find_alias(fah, slen, 0, 0, tb_id, true) != fa_to_delete)
+		return;
+
+	/* Determine if the route should be replaced by the next route in the
+	 * list.
+	 */
+	fa_next = hlist_entry_safe(fa_to_delete->fa_list.next,
+				   struct fib_alias, fa_list);
+	if (fa_next && fa_next->fa_slen == slen && fa_next->tb_id == tb_id) {
+		fib_event = FIB_EVENT_ENTRY_REPLACE;
+		fa_to_notify = fa_next;
+	} else {
+		fib_event = FIB_EVENT_ENTRY_DEL;
+		fa_to_notify = fa_to_delete;
+	}
+	call_fib_entry_notifiers(net, fib_event, key, KEYLENGTH - slen,
+				 fa_to_notify, extack);
+}
+
 /* Caller must hold RTNL. */
 int fib_table_delete(struct net *net, struct fib_table *tb,
 		     struct fib_config *cfg, struct netlink_ext_ack *extack)
@@ -1564,7 +1678,7 @@
 	if (!l)
 		return -ESRCH;
 
-	fa = fib_find_alias(&l->leaf, slen, tos, 0, tb->tb_id);
+	fa = fib_find_alias(&l->leaf, slen, tos, 0, tb->tb_id, false);
 	if (!fa)
 		return -ESRCH;
 
@@ -1586,7 +1700,7 @@
 		     fi->fib_prefsrc == cfg->fc_prefsrc) &&
 		    (!cfg->fc_protocol ||
 		     fi->fib_protocol == cfg->fc_protocol) &&
-		    fib_nh_match(cfg, fi, extack) == 0 &&
+		    fib_nh_match(net, cfg, fi, extack) == 0 &&
 		    fib_metrics_match(cfg, fi)) {
 			fa_to_delete = fa;
 			break;
@@ -1596,8 +1710,7 @@
 	if (!fa_to_delete)
 		return -ESRCH;
 
-	call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, key, plen,
-				 fa_to_delete, extack);
+	fib_notify_alias_delete(net, key, &l->leaf, fa_to_delete, extack);
 	rtmsg_fib(RTM_DELROUTE, htonl(key), fa_to_delete, plen, tb->tb_id,
 		  &cfg->fc_nlinfo, 0);
 
@@ -1921,10 +2034,8 @@
 				continue;
 			}
 
-			call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_DEL,
-						 n->key,
-						 KEYLENGTH - fa->fa_slen, fa,
-						 NULL);
+			fib_notify_alias_delete(net, n->key, &n->leaf, fa,
+						NULL);
 			hlist_del_rcu(&fa->fa_list);
 			fib_release_info(fa->fa_info);
 			alias_free_mem_rcu(fa);
@@ -2016,10 +2127,13 @@
 	}
 }
 
-static void fib_leaf_notify(struct net *net, struct key_vector *l,
-			    struct fib_table *tb, struct notifier_block *nb)
+static int fib_leaf_notify(struct key_vector *l, struct fib_table *tb,
+			   struct notifier_block *nb,
+			   struct netlink_ext_ack *extack)
 {
 	struct fib_alias *fa;
+	int last_slen = -1;
+	int err;
 
 	hlist_for_each_entry_rcu(fa, &l->leaf, fa_list) {
 		struct fib_info *fi = fa->fa_info;
@@ -2033,39 +2147,57 @@
 		if (tb->tb_id != fa->tb_id)
 			continue;
 
-		call_fib_entry_notifier(nb, net, FIB_EVENT_ENTRY_ADD, l->key,
-					KEYLENGTH - fa->fa_slen, fa);
+		if (fa->fa_slen == last_slen)
+			continue;
+
+		last_slen = fa->fa_slen;
+		err = call_fib_entry_notifier(nb, FIB_EVENT_ENTRY_REPLACE,
+					      l->key, KEYLENGTH - fa->fa_slen,
+					      fa, extack);
+		if (err)
+			return err;
 	}
+	return 0;
 }
 
-static void fib_table_notify(struct net *net, struct fib_table *tb,
-			     struct notifier_block *nb)
+static int fib_table_notify(struct fib_table *tb, struct notifier_block *nb,
+			    struct netlink_ext_ack *extack)
 {
 	struct trie *t = (struct trie *)tb->tb_data;
 	struct key_vector *l, *tp = t->kv;
 	t_key key = 0;
+	int err;
 
 	while ((l = leaf_walk_rcu(&tp, key)) != NULL) {
-		fib_leaf_notify(net, l, tb, nb);
+		err = fib_leaf_notify(l, tb, nb, extack);
+		if (err)
+			return err;
 
 		key = l->key + 1;
 		/* stop in case of wrap around */
 		if (key < l->key)
 			break;
 	}
+	return 0;
 }
 
-void fib_notify(struct net *net, struct notifier_block *nb)
+int fib_notify(struct net *net, struct notifier_block *nb,
+	       struct netlink_ext_ack *extack)
 {
 	unsigned int h;
+	int err;
 
 	for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
 		struct hlist_head *head = &net->ipv4.fib_table_hash[h];
 		struct fib_table *tb;
 
-		hlist_for_each_entry_rcu(tb, head, tb_hlist)
-			fib_table_notify(net, tb, nb);
+		hlist_for_each_entry_rcu(tb, head, tb_hlist) {
+			err = fib_table_notify(tb, nb, extack);
+			if (err)
+				return err;
+		}
 	}
+	return 0;
 }
 
 static void __trie_free_rcu(struct rcu_head *head)
@@ -2129,14 +2261,20 @@
 
 		if (filter->dump_routes) {
 			if (!s_fa) {
+				struct fib_rt_info fri;
+
+				fri.fi = fi;
+				fri.tb_id = tb->tb_id;
+				fri.dst = xkey;
+				fri.dst_len = KEYLENGTH - fa->fa_slen;
+				fri.tos = fa->fa_tos;
+				fri.type = fa->fa_type;
+				fri.offload = fa->offload;
+				fri.trap = fa->trap;
 				err = fib_dump_info(skb,
 						    NETLINK_CB(cb->skb).portid,
 						    cb->nlh->nlmsg_seq,
-						    RTM_NEWROUTE,
-						    tb->tb_id, fa->fa_type,
-						    xkey,
-						    KEYLENGTH - fa->fa_slen,
-						    fa->fa_tos, fi, flags);
+						    RTM_NEWROUTE, &fri, flags);
 				if (err < 0)
 					goto stop;
 			}
diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index dcc79ff..e5f69b0 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -237,7 +237,7 @@
 
 	/* We can clear the encap_mark for FOU as we are essentially doing
 	 * one of two possible things.  We are either adding an L4 tunnel
-	 * header to the outer L3 tunnel header, or we are are simply
+	 * header to the outer L3 tunnel header, or we are simply
 	 * treating the GRE tunnel header as though it is a UDP protocol
 	 * specific header such as VXLAN or GENEVE.
 	 */
@@ -429,7 +429,7 @@
 
 	/* We can clear the encap_mark for GUE as we are essentially doing
 	 * one of two possible things.  We are either adding an L4 tunnel
-	 * header to the outer L3 tunnel header, or we are are simply
+	 * header to the outer L3 tunnel header, or we are simply
 	 * treating the GRE tunnel header as though it is a UDP protocol
 	 * specific header such as VXLAN or GENEVE.
 	 */
@@ -911,7 +911,7 @@
 	return skb->len;
 }
 
-static const struct genl_ops fou_nl_ops[] = {
+static const struct genl_small_ops fou_nl_ops[] = {
 	{
 		.cmd = FOU_CMD_ADD,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
@@ -940,8 +940,8 @@
 	.policy = fou_nl_policy,
 	.netnsok	= true,
 	.module		= THIS_MODULE,
-	.ops		= fou_nl_ops,
-	.n_ops		= ARRAY_SIZE(fou_nl_ops),
+	.small_ops	= fou_nl_ops,
+	.n_small_ops	= ARRAY_SIZE(fou_nl_ops),
 };
 
 size_t fou_encap_hlen(struct ip_tunnel_encap *e)
@@ -1304,3 +1304,4 @@
 module_exit(fou_fini);
 MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Foo over UDP");
diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index c840141..e0a2465 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -183,7 +183,7 @@
 		if (skb_gro_checksum_simple_validate(skb))
 			goto out_unlock;
 
-		skb_gro_checksum_try_convert(skb, IPPROTO_GRE, 0,
+		skb_gro_checksum_try_convert(skb, IPPROTO_GRE,
 					     null_compute_pseudo);
 	}
 
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index f86f948..b71b836 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -355,7 +355,7 @@
 
 	csum = skb_copy_and_csum_bits(icmp_param->skb,
 				      icmp_param->offset + offset,
-				      to, len, 0);
+				      to, len);
 
 	skb->csum = csum_block_add(skb->csum, csum, odd);
 	if (icmp_pointers[icmp_param->data.icmph.type].error)
@@ -379,15 +379,15 @@
 		ip_flush_pending_frames(sk);
 	} else if ((skb = skb_peek(&sk->sk_write_queue)) != NULL) {
 		struct icmphdr *icmph = icmp_hdr(skb);
-		__wsum csum = 0;
+		__wsum csum;
 		struct sk_buff *skb1;
 
+		csum = csum_partial_copy_nocheck((void *)&icmp_param->data,
+						 (char *)icmph,
+						 icmp_param->head_len);
 		skb_queue_walk(&sk->sk_write_queue, skb1) {
 			csum = csum_add(csum, skb1->csum);
 		}
-		csum = csum_partial_copy_nocheck((void *)&icmp_param->data,
-						 (char *)icmph,
-						 icmp_param->head_len, csum);
 		icmph->checksum = csum_fold(csum);
 		skb->ip_summed = CHECKSUM_NONE;
 		ip_push_pending_frames(sk, fl4);
@@ -705,15 +705,16 @@
 			dev = dev_get_by_index_rcu(net, inet_iif(skb_in));
 
 		if (dev)
-			saddr = inet_select_addr(dev, 0, RT_SCOPE_LINK);
+			saddr = inet_select_addr(dev, iph->saddr,
+						 RT_SCOPE_LINK);
 		else
 			saddr = 0;
 		rcu_read_unlock();
 	}
 
-	tos = icmp_pointers[type].error ? ((iph->tos & IPTOS_TOS_MASK) |
+	tos = icmp_pointers[type].error ? (RT_TOS(iph->tos) |
 					   IPTOS_PREC_INTERNETCONTROL) :
-					  iph->tos;
+					   iph->tos;
 	mark = IP4_REPLY_MARK(net, skb_in->mark);
 
 	if (__ip_options_echo(net, &icmp_param.replyopts.opt.opt, skb_in, opt))
@@ -813,7 +814,7 @@
 
 static void icmp_socket_deliver(struct sk_buff *skb, u32 info)
 {
-	const struct iphdr *iph = (const struct iphdr *) skb->data;
+	const struct iphdr *iph = (const struct iphdr *)skb->data;
 	const struct net_protocol *ipprot;
 	int protocol = iph->protocol;
 
@@ -882,7 +883,7 @@
 		case ICMP_FRAG_NEEDED:
 			/* for documentation of the ip_no_pmtu_disc
 			 * values please see
-			 * Documentation/networking/ip-sysctl.txt
+			 * Documentation/networking/ip-sysctl.rst
 			 */
 			switch (net->ipv4.sysctl_ip_no_pmtu_disc) {
 			default:
@@ -894,7 +895,7 @@
 			case 3:
 				if (!icmp_tag_validation(iph->protocol))
 					goto out;
-				/* fall through */
+				fallthrough;
 			case 0:
 				info = ntohs(icmph->un.frag.mtu);
 			}
@@ -1145,6 +1146,65 @@
 	goto drop;
 }
 
+static bool ip_icmp_error_rfc4884_validate(const struct sk_buff *skb, int off)
+{
+	struct icmp_extobj_hdr *objh, _objh;
+	struct icmp_ext_hdr *exth, _exth;
+	u16 olen;
+
+	exth = skb_header_pointer(skb, off, sizeof(_exth), &_exth);
+	if (!exth)
+		return false;
+	if (exth->version != 2)
+		return true;
+
+	if (exth->checksum &&
+	    csum_fold(skb_checksum(skb, off, skb->len - off, 0)))
+		return false;
+
+	off += sizeof(_exth);
+	while (off < skb->len) {
+		objh = skb_header_pointer(skb, off, sizeof(_objh), &_objh);
+		if (!objh)
+			return false;
+
+		olen = ntohs(objh->length);
+		if (olen < sizeof(_objh))
+			return false;
+
+		off += olen;
+		if (off > skb->len)
+			return false;
+	}
+
+	return true;
+}
+
+void ip_icmp_error_rfc4884(const struct sk_buff *skb,
+			   struct sock_ee_data_rfc4884 *out,
+			   int thlen, int off)
+{
+	int hlen;
+
+	/* original datagram headers: end of icmph to payload (skb->data) */
+	hlen = -skb_transport_offset(skb) - thlen;
+
+	/* per rfc 4884: minimal datagram length of 128 bytes */
+	if (off < 128 || off < hlen)
+		return;
+
+	/* kernel has stripped headers: return payload offset in bytes */
+	off -= hlen;
+	if (off + sizeof(struct icmp_ext_hdr) > skb->len)
+		return;
+
+	out->len = off;
+
+	if (!ip_icmp_error_rfc4884_validate(skb, off))
+		out->flags |= SO_EE_RFC4884_FLAG_INVALID;
+}
+EXPORT_SYMBOL_GPL(ip_icmp_error_rfc4884);
+
 int icmp_err(struct sk_buff *skb, u32 info)
 {
 	struct iphdr *iph = (struct iphdr *)skb->data;
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index b1ecc91..0c32199 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -107,8 +107,6 @@
 #ifdef CONFIG_IP_MULTICAST
 /* Parameter names and values are taken from igmp-v2-06 draft */
 
-#define IGMP_V2_UNSOLICITED_REPORT_INTERVAL	(10*HZ)
-#define IGMP_V3_UNSOLICITED_REPORT_INTERVAL	(1*HZ)
 #define IGMP_QUERY_INTERVAL			(125*HZ)
 #define IGMP_QUERY_RESPONSE_INTERVAL		(10*HZ)
 
@@ -1570,7 +1568,7 @@
 	}
 }
 
-static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
+static __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
 {
 	return skb_checksum_simple_validate(skb);
 }
@@ -2575,9 +2573,9 @@
 }
 
 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
-	struct group_filter __user *optval, int __user *optlen)
+	struct sockaddr_storage __user *p)
 {
-	int err, i, count, copycount;
+	int i, count, copycount;
 	struct sockaddr_in *psin;
 	__be32 addr;
 	struct ip_mc_socklist *pmc;
@@ -2593,37 +2591,29 @@
 	if (!ipv4_is_multicast(addr))
 		return -EINVAL;
 
-	err = -EADDRNOTAVAIL;
-
 	for_each_pmc_rtnl(inet, pmc) {
 		if (pmc->multi.imr_multiaddr.s_addr == addr &&
 		    pmc->multi.imr_ifindex == gsf->gf_interface)
 			break;
 	}
 	if (!pmc)		/* must have a prior join */
-		goto done;
+		return -EADDRNOTAVAIL;
 	gsf->gf_fmode = pmc->sfmode;
 	psl = rtnl_dereference(pmc->sflist);
 	count = psl ? psl->sl_count : 0;
 	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 	gsf->gf_numsrc = count;
-	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
-	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
-		return -EFAULT;
-	}
-	for (i = 0; i < copycount; i++) {
+	for (i = 0; i < copycount; i++, p++) {
 		struct sockaddr_storage ss;
 
 		psin = (struct sockaddr_in *)&ss;
 		memset(&ss, 0, sizeof(ss));
 		psin->sin_family = AF_INET;
 		psin->sin_addr.s_addr = psl->sl_addr[i];
-		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
+		if (copy_to_user(p, &ss, sizeof(ss)))
 			return -EFAULT;
 	}
 	return 0;
-done:
-	return err;
 }
 
 /*
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 85a8842..addd595 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -136,7 +136,7 @@
 {
 	struct sock *sk2;
 	bool reuse = sk->sk_reuse;
-	bool reuseport = !!sk->sk_reuseport && reuseport_ok;
+	bool reuseport = !!sk->sk_reuseport;
 	kuid_t uid = sock_i_uid((struct sock *)sk);
 
 	/*
@@ -151,17 +151,21 @@
 		    (!sk->sk_bound_dev_if ||
 		     !sk2->sk_bound_dev_if ||
 		     sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
-			if ((!reuse || !sk2->sk_reuse ||
-			    sk2->sk_state == TCP_LISTEN) &&
-			    (!reuseport || !sk2->sk_reuseport ||
-			     rcu_access_pointer(sk->sk_reuseport_cb) ||
-			     (sk2->sk_state != TCP_TIME_WAIT &&
-			     !uid_eq(uid, sock_i_uid(sk2))))) {
-				if (inet_rcv_saddr_equal(sk, sk2, true))
-					break;
-			}
-			if (!relax && reuse && sk2->sk_reuse &&
+			if (reuse && sk2->sk_reuse &&
 			    sk2->sk_state != TCP_LISTEN) {
+				if ((!relax ||
+				     (!reuseport_ok &&
+				      reuseport && sk2->sk_reuseport &&
+				      !rcu_access_pointer(sk->sk_reuseport_cb) &&
+				      (sk2->sk_state == TCP_TIME_WAIT ||
+				       uid_eq(uid, sock_i_uid(sk2))))) &&
+				    inet_rcv_saddr_equal(sk, sk2, true))
+					break;
+			} else if (!reuseport_ok ||
+				   !reuseport || !sk2->sk_reuseport ||
+				   rcu_access_pointer(sk->sk_reuseport_cb) ||
+				   (sk2->sk_state != TCP_TIME_WAIT &&
+				    !uid_eq(uid, sock_i_uid(sk2)))) {
 				if (inet_rcv_saddr_equal(sk, sk2, true))
 					break;
 			}
@@ -181,12 +185,14 @@
 	int port = 0;
 	struct inet_bind_hashbucket *head;
 	struct net *net = sock_net(sk);
+	bool relax = false;
 	int i, low, high, attempt_half;
 	struct inet_bind_bucket *tb;
 	u32 remaining, offset;
 	int l3mdev;
 
 	l3mdev = inet_sk_bound_l3mdev(sk);
+ports_exhausted:
 	attempt_half = (sk->sk_reuse == SK_CAN_REUSE) ? 1 : 0;
 other_half_scan:
 	inet_get_local_port_range(net, &low, &high);
@@ -224,7 +230,7 @@
 		inet_bind_bucket_for_each(tb, &head->chain)
 			if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev &&
 			    tb->port == port) {
-				if (!inet_csk_bind_conflict(sk, tb, false, false))
+				if (!inet_csk_bind_conflict(sk, tb, relax, false))
 					goto success;
 				goto next_port;
 			}
@@ -244,6 +250,12 @@
 		attempt_half = 2;
 		goto other_half_scan;
 	}
+
+	if (net->ipv4.sysctl_ip_autobind_reuse && !relax) {
+		/* We still have a chance to connect to different destinations */
+		relax = true;
+		goto ports_exhausted;
+	}
 	return NULL;
 success:
 	*port_ret = port;
@@ -552,7 +564,7 @@
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 
-	icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0;
+	icsk->icsk_pending = icsk->icsk_ack.pending = 0;
 
 	sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
 	sk_stop_timer(sk, &icsk->icsk_delack_timer);
@@ -644,27 +656,20 @@
 }
 EXPORT_SYMBOL_GPL(inet_csk_route_child_sock);
 
-#if IS_ENABLED(CONFIG_IPV6)
-#define AF_INET_FAMILY(fam) ((fam) == AF_INET)
-#else
-#define AF_INET_FAMILY(fam) true
-#endif
-
 /* Decide when to expire the request and when to resend SYN-ACK */
-static inline void syn_ack_recalc(struct request_sock *req, const int thresh,
-				  const int max_retries,
-				  const u8 rskq_defer_accept,
-				  int *expire, int *resend)
+static void syn_ack_recalc(struct request_sock *req,
+			   const int max_syn_ack_retries,
+			   const u8 rskq_defer_accept,
+			   int *expire, int *resend)
 {
 	if (!rskq_defer_accept) {
-		*expire = req->num_timeout >= thresh;
+		*expire = req->num_timeout >= max_syn_ack_retries;
 		*resend = 1;
 		return;
 	}
-	*expire = req->num_timeout >= thresh &&
-		  (!inet_rsk(req)->acked || req->num_timeout >= max_retries);
-	/*
-	 * Do not resend while waiting for data after ACK,
+	*expire = req->num_timeout >= max_syn_ack_retries &&
+		  (!inet_rsk(req)->acked || req->num_timeout >= rskq_defer_accept);
+	/* Do not resend while waiting for data after ACK,
 	 * start to resend on end of deferring period to give
 	 * last chance for data or ACK to create established socket.
 	 */
@@ -726,15 +731,12 @@
 	struct net *net = sock_net(sk_listener);
 	struct inet_connection_sock *icsk = inet_csk(sk_listener);
 	struct request_sock_queue *queue = &icsk->icsk_accept_queue;
-	int qlen, expire = 0, resend = 0;
-	int max_retries, thresh;
-	u8 defer_accept;
+	int max_syn_ack_retries, qlen, expire = 0, resend = 0;
 
 	if (inet_sk_state_load(sk_listener) != TCP_LISTEN)
 		goto drop;
 
-	max_retries = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_synack_retries;
-	thresh = max_retries;
+	max_syn_ack_retries = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_synack_retries;
 	/* Normally all the openreqs are young and become mature
 	 * (i.e. converted to established socket) for first timeout.
 	 * If synack was not acknowledged for 1 second, it means
@@ -753,20 +755,17 @@
 	 * ones are about to clog our table.
 	 */
 	qlen = reqsk_queue_len(queue);
-	if ((qlen << 1) > max(8U, sk_listener->sk_max_ack_backlog)) {
+	if ((qlen << 1) > max(8U, READ_ONCE(sk_listener->sk_max_ack_backlog))) {
 		int young = reqsk_queue_len_young(queue) << 1;
 
-		while (thresh > 2) {
+		while (max_syn_ack_retries > 2) {
 			if (qlen < young)
 				break;
-			thresh--;
+			max_syn_ack_retries--;
 			young <<= 1;
 		}
 	}
-	defer_accept = READ_ONCE(queue->rskq_defer_accept);
-	if (defer_accept)
-		max_retries = defer_accept;
-	syn_ack_recalc(req, thresh, max_retries, defer_accept,
+	syn_ack_recalc(req, max_syn_ack_retries, READ_ONCE(queue->rskq_defer_accept),
 		       &expire, &resend);
 	req->rsk_ops->syn_ack_timeout(req);
 	if (!expire &&
@@ -791,7 +790,7 @@
 	timer_setup(&req->rsk_timer, reqsk_timer_handler, TIMER_PINNED);
 	mod_timer(&req->rsk_timer, jiffies + timeout);
 
-	inet_ehash_insert(req_to_sk(req), NULL);
+	inet_ehash_insert(req_to_sk(req), NULL, NULL);
 	/* before letting lookups find us, make sure all req fields
 	 * are committed to memory and refcnt initialized.
 	 */
@@ -807,6 +806,18 @@
 }
 EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
 
+static void inet_clone_ulp(const struct request_sock *req, struct sock *newsk,
+			   const gfp_t priority)
+{
+	struct inet_connection_sock *icsk = inet_csk(newsk);
+
+	if (!icsk->icsk_ulp_ops)
+		return;
+
+	if (icsk->icsk_ulp_ops->clone)
+		icsk->icsk_ulp_ops->clone(req, newsk, priority);
+}
+
 /**
  *	inet_csk_clone_lock - clone an inet socket, and lock its clone
  *	@sk: the socket to clone
@@ -848,6 +859,8 @@
 		/* Deinitialize accept_queue to trap illegal accesses. */
 		memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
 
+		inet_clone_ulp(req, newsk, priority);
+
 		security_inet_csk_clone(newsk, req);
 	}
 	return newsk;
@@ -879,7 +892,7 @@
 
 	sk_refcnt_debug_release(sk);
 
-	percpu_counter_dec(sk->sk_prot->orphan_count);
+	this_cpu_dec(*sk->sk_prot->orphan_count);
 
 	sock_put(sk);
 }
@@ -894,10 +907,7 @@
 	/* sk_clone_lock locked the socket and set refcnt to 2 */
 	bh_unlock_sock(sk);
 	sock_put(sk);
-
-	/* The below has to be done to allow calling inet_csk_destroy_sock */
-	sock_set_flag(sk, SOCK_DEAD);
-	percpu_counter_inc(sk->sk_prot->orphan_count);
+	inet_csk_prepare_for_destroy_sock(sk);
 	inet_sk(sk)->inet_num = 0;
 }
 EXPORT_SYMBOL(inet_csk_prepare_forced_close);
@@ -941,7 +951,7 @@
 
 	sock_orphan(child);
 
-	percpu_counter_inc(sk->sk_prot->orphan_count);
+	this_cpu_inc(*sk->sk_prot->orphan_count);
 
 	if (sk->sk_protocol == IPPROTO_TCP && tcp_rsk(req)->tfo_listener) {
 		BUG_ON(rcu_access_pointer(tcp_sk(child)->fastopen_rsk) != req);
@@ -1060,34 +1070,6 @@
 }
 EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr);
 
-#ifdef CONFIG_COMPAT
-int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
-			       char __user *optval, int __user *optlen)
-{
-	const struct inet_connection_sock *icsk = inet_csk(sk);
-
-	if (icsk->icsk_af_ops->compat_getsockopt)
-		return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname,
-							    optval, optlen);
-	return icsk->icsk_af_ops->getsockopt(sk, level, optname,
-					     optval, optlen);
-}
-EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt);
-
-int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
-			       char __user *optval, unsigned int optlen)
-{
-	const struct inet_connection_sock *icsk = inet_csk(sk);
-
-	if (icsk->icsk_af_ops->compat_setsockopt)
-		return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname,
-							    optval, optlen);
-	return icsk->icsk_af_ops->setsockopt(sk, level, optname,
-					     optval, optlen);
-}
-EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt);
-#endif
-
 static struct dst_entry *inet_csk_rebuild_route(struct sock *sk, struct flowi *fl)
 {
 	const struct inet_sock *inet = inet_sk(sk);
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 4f71aca..fa9f1de 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -23,6 +23,7 @@
 #include <net/inet_hashtables.h>
 #include <net/inet_timewait_sock.h>
 #include <net/inet6_hashtables.h>
+#include <net/bpf_sk_storage.h>
 #include <net/netlink.h>
 
 #include <linux/inet.h>
@@ -42,12 +43,20 @@
 	u16 userlocks;
 	u32 ifindex;
 	u32 mark;
+#ifdef CONFIG_SOCK_CGROUP_DATA
+	u64 cgroup_id;
+#endif
 };
 
 static DEFINE_MUTEX(inet_diag_table_mutex);
 
 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
 {
+	if (proto < 0 || proto >= IPPROTO_MAX) {
+		mutex_lock(&inet_diag_table_mutex);
+		return ERR_PTR(-ENOENT);
+	}
+
 	if (!inet_diag_table[proto])
 		sock_load_diag_module(AF_INET, proto);
 
@@ -116,6 +125,7 @@
 			     bool net_admin)
 {
 	const struct inet_sock *inet = inet_sk(sk);
+	struct inet_diag_sockopt inet_sockopt;
 
 	if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 		goto errout;
@@ -161,35 +171,86 @@
 			goto errout;
 	}
 
+#ifdef CONFIG_SOCK_CGROUP_DATA
+	if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
+			      cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
+			      INET_DIAG_PAD))
+		goto errout;
+#endif
+
 	r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 	r->idiag_inode = sock_i_ino(sk);
 
+	memset(&inet_sockopt, 0, sizeof(inet_sockopt));
+	inet_sockopt.recverr	= inet->recverr;
+	inet_sockopt.is_icsk	= inet->is_icsk;
+	inet_sockopt.freebind	= inet->freebind;
+	inet_sockopt.hdrincl	= inet->hdrincl;
+	inet_sockopt.mc_loop	= inet->mc_loop;
+	inet_sockopt.transparent = inet->transparent;
+	inet_sockopt.mc_all	= inet->mc_all;
+	inet_sockopt.nodefrag	= inet->nodefrag;
+	inet_sockopt.bind_address_no_port = inet->bind_address_no_port;
+	inet_sockopt.recverr_rfc4884 = inet->recverr_rfc4884;
+	inet_sockopt.defer_connect = inet->defer_connect;
+	if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),
+		    &inet_sockopt))
+		goto errout;
+
 	return 0;
 errout:
 	return 1;
 }
 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
 
+static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
+				 struct nlattr **req_nlas)
+{
+	struct nlattr *nla;
+	int remaining;
+
+	nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
+		int type = nla_type(nla);
+
+		if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
+			return -EINVAL;
+
+		if (type < __INET_DIAG_REQ_MAX)
+			req_nlas[type] = nla;
+	}
+	return 0;
+}
+
+static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
+				  const struct inet_diag_dump_data *data)
+{
+	if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
+		return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
+	return req->sdiag_protocol;
+}
+
+#define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
+
 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
-		      struct sk_buff *skb, const struct inet_diag_req_v2 *req,
-		      struct user_namespace *user_ns,
-		      u32 portid, u32 seq, u16 nlmsg_flags,
-		      const struct nlmsghdr *unlh,
-		      bool net_admin)
+		      struct sk_buff *skb, struct netlink_callback *cb,
+		      const struct inet_diag_req_v2 *req,
+		      u16 nlmsg_flags, bool net_admin)
 {
 	const struct tcp_congestion_ops *ca_ops;
 	const struct inet_diag_handler *handler;
+	struct inet_diag_dump_data *cb_data;
 	int ext = req->idiag_ext;
 	struct inet_diag_msg *r;
 	struct nlmsghdr  *nlh;
 	struct nlattr *attr;
 	void *info = NULL;
 
-	handler = inet_diag_table[req->sdiag_protocol];
+	cb_data = cb->data;
+	handler = inet_diag_table[inet_diag_get_protocol(req, cb_data)];
 	BUG_ON(!handler);
 
-	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
-			nlmsg_flags);
+	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+			cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
 	if (!nlh)
 		return -EMSGSIZE;
 
@@ -200,8 +261,11 @@
 	r->idiag_state = sk->sk_state;
 	r->idiag_timer = 0;
 	r->idiag_retrans = 0;
+	r->idiag_expires = 0;
 
-	if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
+	if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
+				     sk_user_ns(NETLINK_CB(cb->skb).sk),
+				     net_admin))
 		goto errout;
 
 	if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
@@ -240,20 +304,17 @@
 		r->idiag_timer = 1;
 		r->idiag_retrans = icsk->icsk_retransmits;
 		r->idiag_expires =
-			jiffies_to_msecs(icsk->icsk_timeout - jiffies);
+			jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
 	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 		r->idiag_timer = 4;
 		r->idiag_retrans = icsk->icsk_probes_out;
 		r->idiag_expires =
-			jiffies_to_msecs(icsk->icsk_timeout - jiffies);
+			jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
 	} else if (timer_pending(&sk->sk_timer)) {
 		r->idiag_timer = 2;
 		r->idiag_retrans = icsk->icsk_probes_out;
 		r->idiag_expires =
-			jiffies_to_msecs(sk->sk_timer.expires - jiffies);
-	} else {
-		r->idiag_timer = 0;
-		r->idiag_expires = 0;
+			jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
 	}
 
 	if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
@@ -298,6 +359,48 @@
 			goto errout;
 	}
 
+	/* Keep it at the end for potential retry with a larger skb,
+	 * or else do best-effort fitting, which is only done for the
+	 * first_nlmsg.
+	 */
+	if (cb_data->bpf_stg_diag) {
+		bool first_nlmsg = ((unsigned char *)nlh == skb->data);
+		unsigned int prev_min_dump_alloc;
+		unsigned int total_nla_size = 0;
+		unsigned int msg_len;
+		int err;
+
+		msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
+		err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
+					      INET_DIAG_SK_BPF_STORAGES,
+					      &total_nla_size);
+
+		if (!err)
+			goto out;
+
+		total_nla_size += msg_len;
+		prev_min_dump_alloc = cb->min_dump_alloc;
+		if (total_nla_size > prev_min_dump_alloc)
+			cb->min_dump_alloc = min_t(u32, total_nla_size,
+						   MAX_DUMP_ALLOC_SIZE);
+
+		if (!first_nlmsg)
+			goto errout;
+
+		if (cb->min_dump_alloc > prev_min_dump_alloc)
+			/* Retry with pskb_expand_head() with
+			 * __GFP_DIRECT_RECLAIM
+			 */
+			goto errout;
+
+		WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
+
+		/* Send what we have for this sk
+		 * and move on to the next sk in the following
+		 * dump()
+		 */
+	}
+
 out:
 	nlmsg_end(skb, nlh);
 	return 0;
@@ -308,46 +411,32 @@
 }
 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 
-static int inet_csk_diag_fill(struct sock *sk,
-			      struct sk_buff *skb,
-			      const struct inet_diag_req_v2 *req,
-			      struct user_namespace *user_ns,
-			      u32 portid, u32 seq, u16 nlmsg_flags,
-			      const struct nlmsghdr *unlh,
-			      bool net_admin)
-{
-	return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
-				 portid, seq, nlmsg_flags, unlh, net_admin);
-}
-
 static int inet_twsk_diag_fill(struct sock *sk,
 			       struct sk_buff *skb,
-			       u32 portid, u32 seq, u16 nlmsg_flags,
-			       const struct nlmsghdr *unlh)
+			       struct netlink_callback *cb,
+			       u16 nlmsg_flags)
 {
 	struct inet_timewait_sock *tw = inet_twsk(sk);
 	struct inet_diag_msg *r;
 	struct nlmsghdr *nlh;
 	long tmo;
 
-	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
-			nlmsg_flags);
+	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
+			cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type,
+			sizeof(*r), nlmsg_flags);
 	if (!nlh)
 		return -EMSGSIZE;
 
 	r = nlmsg_data(nlh);
 	BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 
-	tmo = tw->tw_timer.expires - jiffies;
-	if (tmo < 0)
-		tmo = 0;
-
 	inet_diag_msg_common_fill(r, sk);
 	r->idiag_retrans      = 0;
 
 	r->idiag_state	      = tw->tw_substate;
 	r->idiag_timer	      = 3;
-	r->idiag_expires      = jiffies_to_msecs(tmo);
+	tmo = tw->tw_timer.expires - jiffies;
+	r->idiag_expires      = jiffies_delta_to_msecs(tmo);
 	r->idiag_rqueue	      = 0;
 	r->idiag_wqueue	      = 0;
 	r->idiag_uid	      = 0;
@@ -358,16 +447,16 @@
 }
 
 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
-			      u32 portid, u32 seq, u16 nlmsg_flags,
-			      const struct nlmsghdr *unlh, bool net_admin)
+			      struct netlink_callback *cb,
+			      u16 nlmsg_flags, bool net_admin)
 {
 	struct request_sock *reqsk = inet_reqsk(sk);
 	struct inet_diag_msg *r;
 	struct nlmsghdr *nlh;
 	long tmo;
 
-	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
-			nlmsg_flags);
+	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+			cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
 	if (!nlh)
 		return -EMSGSIZE;
 
@@ -381,7 +470,7 @@
 		     offsetof(struct sock, sk_cookie));
 
 	tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
-	r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
+	r->idiag_expires = jiffies_delta_to_msecs(tmo);
 	r->idiag_rqueue	= 0;
 	r->idiag_wqueue	= 0;
 	r->idiag_uid	= 0;
@@ -398,21 +487,18 @@
 }
 
 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
+			struct netlink_callback *cb,
 			const struct inet_diag_req_v2 *r,
-			struct user_namespace *user_ns,
-			u32 portid, u32 seq, u16 nlmsg_flags,
-			const struct nlmsghdr *unlh, bool net_admin)
+			u16 nlmsg_flags, bool net_admin)
 {
 	if (sk->sk_state == TCP_TIME_WAIT)
-		return inet_twsk_diag_fill(sk, skb, portid, seq,
-					   nlmsg_flags, unlh);
+		return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags);
 
 	if (sk->sk_state == TCP_NEW_SYN_RECV)
-		return inet_req_diag_fill(sk, skb, portid, seq,
-					  nlmsg_flags, unlh, net_admin);
+		return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
 
-	return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
-				  nlmsg_flags, unlh, net_admin);
+	return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
+				 net_admin);
 }
 
 struct sock *inet_diag_find_one_icsk(struct net *net,
@@ -460,10 +546,10 @@
 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 
 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
-			    struct sk_buff *in_skb,
-			    const struct nlmsghdr *nlh,
+			    struct netlink_callback *cb,
 			    const struct inet_diag_req_v2 *req)
 {
+	struct sk_buff *in_skb = cb->skb;
 	bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
 	struct net *net = sock_net(in_skb->sk);
 	struct sk_buff *rep;
@@ -480,10 +566,7 @@
 		goto out;
 	}
 
-	err = sk_diag_fill(sk, rep, req,
-			   sk_user_ns(NETLINK_CB(in_skb).sk),
-			   NETLINK_CB(in_skb).portid,
-			   nlh->nlmsg_seq, 0, nlh, net_admin);
+	err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
 	if (err < 0) {
 		WARN_ON(err == -EMSGSIZE);
 		nlmsg_free(rep);
@@ -504,20 +587,35 @@
 
 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 			       const struct nlmsghdr *nlh,
+			       int hdrlen,
 			       const struct inet_diag_req_v2 *req)
 {
 	const struct inet_diag_handler *handler;
-	int err;
+	struct inet_diag_dump_data dump_data;
+	int err, protocol;
 
-	handler = inet_diag_lock_handler(req->sdiag_protocol);
-	if (IS_ERR(handler))
+	memset(&dump_data, 0, sizeof(dump_data));
+	err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
+	if (err)
+		return err;
+
+	protocol = inet_diag_get_protocol(req, &dump_data);
+
+	handler = inet_diag_lock_handler(protocol);
+	if (IS_ERR(handler)) {
 		err = PTR_ERR(handler);
-	else if (cmd == SOCK_DIAG_BY_FAMILY)
-		err = handler->dump_one(in_skb, nlh, req);
-	else if (cmd == SOCK_DESTROY && handler->destroy)
+	} else if (cmd == SOCK_DIAG_BY_FAMILY) {
+		struct netlink_callback cb = {
+			.nlh = nlh,
+			.skb = in_skb,
+			.data = &dump_data,
+		};
+		err = handler->dump_one(&cb, req);
+	} else if (cmd == SOCK_DESTROY && handler->destroy) {
 		err = handler->destroy(in_skb, req);
-	else
+	} else {
 		err = -EOPNOTSUPP;
+	}
 	inet_diag_unlock_handler(handler);
 
 	return err;
@@ -643,6 +741,16 @@
 				yes = 0;
 			break;
 		}
+#ifdef CONFIG_SOCK_CGROUP_DATA
+		case INET_DIAG_BC_CGROUP_COND: {
+			u64 cgroup_id;
+
+			cgroup_id = get_unaligned((const u64 *)(op + 1));
+			if (cgroup_id != entry->cgroup_id)
+				yes = 0;
+			break;
+		}
+#endif
 		}
 
 		if (yes) {
@@ -693,6 +801,10 @@
 		entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 	else
 		entry.mark = 0;
+#ifdef CONFIG_SOCK_CGROUP_DATA
+	entry.cgroup_id = sk_fullsock(sk) ?
+		cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
+#endif
 
 	return inet_diag_bc_run(bc, &entry);
 }
@@ -782,6 +894,15 @@
 	return len >= *min_len;
 }
 
+#ifdef CONFIG_SOCK_CGROUP_DATA
+static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
+			     int *min_len)
+{
+	*min_len += sizeof(u64);
+	return len >= *min_len;
+}
+#endif
+
 static int inet_diag_bc_audit(const struct nlattr *attr,
 			      const struct sk_buff *skb)
 {
@@ -824,6 +945,12 @@
 			if (!valid_markcond(bc, len, &min_len))
 				return -EINVAL;
 			break;
+#ifdef CONFIG_SOCK_CGROUP_DATA
+		case INET_DIAG_BC_CGROUP_COND:
+			if (!valid_cgroupcond(bc, len, &min_len))
+				return -EINVAL;
+			break;
+#endif
 		case INET_DIAG_BC_AUTO:
 		case INET_DIAG_BC_JMP:
 		case INET_DIAG_BC_NOP:
@@ -848,23 +975,6 @@
 	return len == 0 ? 0 : -EINVAL;
 }
 
-static int inet_csk_diag_dump(struct sock *sk,
-			      struct sk_buff *skb,
-			      struct netlink_callback *cb,
-			      const struct inet_diag_req_v2 *r,
-			      const struct nlattr *bc,
-			      bool net_admin)
-{
-	if (!inet_diag_bc_sk(bc, sk))
-		return 0;
-
-	return inet_csk_diag_fill(sk, skb, r,
-				  sk_user_ns(NETLINK_CB(cb->skb).sk),
-				  NETLINK_CB(cb->skb).portid,
-				  cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
-				  net_admin);
-}
-
 static void twsk_build_assert(void)
 {
 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
@@ -893,14 +1003,17 @@
 
 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 			 struct netlink_callback *cb,
-			 const struct inet_diag_req_v2 *r, struct nlattr *bc)
+			 const struct inet_diag_req_v2 *r)
 {
 	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
+	struct inet_diag_dump_data *cb_data = cb->data;
 	struct net *net = sock_net(skb->sk);
 	u32 idiag_states = r->idiag_states;
 	int i, num, s_i, s_num;
+	struct nlattr *bc;
 	struct sock *sk;
 
+	bc = cb_data->inet_diag_nla_bc;
 	if (idiag_states & TCPF_SYN_RECV)
 		idiag_states |= TCPF_NEW_SYN_RECV;
 	s_i = cb->args[1];
@@ -936,8 +1049,12 @@
 				    r->id.idiag_sport)
 					goto next_listen;
 
-				if (inet_csk_diag_dump(sk, skb, cb, r,
-						       bc, net_admin) < 0) {
+				if (!inet_diag_bc_sk(bc, sk))
+					goto next_listen;
+
+				if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
+						      cb, r, NLM_F_MULTI,
+						      net_admin) < 0) {
 					spin_unlock(&ilb->lock);
 					goto done;
 				}
@@ -1015,11 +1132,8 @@
 		res = 0;
 		for (idx = 0; idx < accum; idx++) {
 			if (res >= 0) {
-				res = sk_diag_fill(sk_arr[idx], skb, r,
-					   sk_user_ns(NETLINK_CB(cb->skb).sk),
-					   NETLINK_CB(cb->skb).portid,
-					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
-					   cb->nlh, net_admin);
+				res = sk_diag_fill(sk_arr[idx], skb, cb, r,
+						   NLM_F_MULTI, net_admin);
 				if (res < 0)
 					num = num_arr[idx];
 			}
@@ -1043,31 +1157,101 @@
 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 
 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
-			    const struct inet_diag_req_v2 *r,
-			    struct nlattr *bc)
+			    const struct inet_diag_req_v2 *r)
 {
+	struct inet_diag_dump_data *cb_data = cb->data;
 	const struct inet_diag_handler *handler;
-	int err = 0;
+	u32 prev_min_dump_alloc;
+	int protocol, err = 0;
 
-	handler = inet_diag_lock_handler(r->sdiag_protocol);
+	protocol = inet_diag_get_protocol(r, cb_data);
+
+again:
+	prev_min_dump_alloc = cb->min_dump_alloc;
+	handler = inet_diag_lock_handler(protocol);
 	if (!IS_ERR(handler))
-		handler->dump(skb, cb, r, bc);
+		handler->dump(skb, cb, r);
 	else
 		err = PTR_ERR(handler);
 	inet_diag_unlock_handler(handler);
 
+	/* The skb is not large enough to fit one sk info and
+	 * inet_sk_diag_fill() has requested for a larger skb.
+	 */
+	if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
+		err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
+		if (!err)
+			goto again;
+	}
+
 	return err ? : skb->len;
 }
 
 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 {
-	int hdrlen = sizeof(struct inet_diag_req_v2);
-	struct nlattr *bc = NULL;
+	return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
+}
 
-	if (nlmsg_attrlen(cb->nlh, hdrlen))
-		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
+static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
+{
+	const struct nlmsghdr *nlh = cb->nlh;
+	struct inet_diag_dump_data *cb_data;
+	struct sk_buff *skb = cb->skb;
+	struct nlattr *nla;
+	int err;
 
-	return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
+	cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
+	if (!cb_data)
+		return -ENOMEM;
+
+	err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
+	if (err) {
+		kfree(cb_data);
+		return err;
+	}
+	nla = cb_data->inet_diag_nla_bc;
+	if (nla) {
+		err = inet_diag_bc_audit(nla, skb);
+		if (err) {
+			kfree(cb_data);
+			return err;
+		}
+	}
+
+	nla = cb_data->inet_diag_nla_bpf_stgs;
+	if (nla) {
+		struct bpf_sk_storage_diag *bpf_stg_diag;
+
+		bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
+		if (IS_ERR(bpf_stg_diag)) {
+			kfree(cb_data);
+			return PTR_ERR(bpf_stg_diag);
+		}
+		cb_data->bpf_stg_diag = bpf_stg_diag;
+	}
+
+	cb->data = cb_data;
+	return 0;
+}
+
+static int inet_diag_dump_start(struct netlink_callback *cb)
+{
+	return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
+}
+
+static int inet_diag_dump_start_compat(struct netlink_callback *cb)
+{
+	return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
+}
+
+static int inet_diag_dump_done(struct netlink_callback *cb)
+{
+	struct inet_diag_dump_data *cb_data = cb->data;
+
+	bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
+	kfree(cb->data);
+
+	return 0;
 }
 
 static int inet_diag_type2proto(int type)
@@ -1086,9 +1270,7 @@
 				 struct netlink_callback *cb)
 {
 	struct inet_diag_req *rc = nlmsg_data(cb->nlh);
-	int hdrlen = sizeof(struct inet_diag_req);
 	struct inet_diag_req_v2 req;
-	struct nlattr *bc = NULL;
 
 	req.sdiag_family = AF_UNSPEC; /* compatibility */
 	req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
@@ -1096,10 +1278,7 @@
 	req.idiag_states = rc->idiag_states;
 	req.id = rc->id;
 
-	if (nlmsg_attrlen(cb->nlh, hdrlen))
-		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
-
-	return __inet_diag_dump(skb, cb, &req, bc);
+	return __inet_diag_dump(skb, cb, &req);
 }
 
 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
@@ -1114,7 +1293,8 @@
 	req.idiag_states = rc->idiag_states;
 	req.id = rc->id;
 
-	return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
+	return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
+				   sizeof(struct inet_diag_req), &req);
 }
 
 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
@@ -1127,22 +1307,12 @@
 		return -EINVAL;
 
 	if (nlh->nlmsg_flags & NLM_F_DUMP) {
-		if (nlmsg_attrlen(nlh, hdrlen)) {
-			struct nlattr *attr;
-			int err;
-
-			attr = nlmsg_find_attr(nlh, hdrlen,
-					       INET_DIAG_REQ_BYTECODE);
-			err = inet_diag_bc_audit(attr, skb);
-			if (err)
-				return err;
-		}
-		{
-			struct netlink_dump_control c = {
-				.dump = inet_diag_dump_compat,
-			};
-			return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
-		}
+		struct netlink_dump_control c = {
+			.start = inet_diag_dump_start_compat,
+			.done = inet_diag_dump_done,
+			.dump = inet_diag_dump_compat,
+		};
+		return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
 	}
 
 	return inet_diag_get_exact_compat(skb, nlh);
@@ -1158,25 +1328,16 @@
 
 	if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
 	    h->nlmsg_flags & NLM_F_DUMP) {
-		if (nlmsg_attrlen(h, hdrlen)) {
-			struct nlattr *attr;
-			int err;
-
-			attr = nlmsg_find_attr(h, hdrlen,
-					       INET_DIAG_REQ_BYTECODE);
-			err = inet_diag_bc_audit(attr, skb);
-			if (err)
-				return err;
-		}
-		{
-			struct netlink_dump_control c = {
-				.dump = inet_diag_dump,
-			};
-			return netlink_dump_start(net->diag_nlsk, skb, h, &c);
-		}
+		struct netlink_dump_control c = {
+			.start = inet_diag_dump_start,
+			.done = inet_diag_dump_done,
+			.dump = inet_diag_dump,
+		};
+		return netlink_dump_start(net->diag_nlsk, skb, h, &c);
 	}
 
-	return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
+	return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
+				   nlmsg_data(h));
 }
 
 static
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index 10d3173..e0e8a65 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -204,9 +204,9 @@
 		/* The RCU read lock provides a memory barrier
 		 * guaranteeing that if fqdir->dead is false then
 		 * the hash table destruction will not start until
-		 * after we unlock.  Paired with inet_frags_exit_net().
+		 * after we unlock.  Paired with fqdir_pre_exit().
 		 */
-		if (!fqdir->dead) {
+		if (!READ_ONCE(fqdir->dead)) {
 			rhashtable_remove_fast(&fqdir->rhashtable, &fq->node,
 					       fqdir->f->rhash_params);
 			refcount_dec(&fq->refcnt);
@@ -321,9 +321,11 @@
 /* TODO : call from rcu_read_lock() and no longer use refcount_inc_not_zero() */
 struct inet_frag_queue *inet_frag_find(struct fqdir *fqdir, void *key)
 {
+	/* This pairs with WRITE_ONCE() in fqdir_pre_exit(). */
+	long high_thresh = READ_ONCE(fqdir->high_thresh);
 	struct inet_frag_queue *fq = NULL, *prev;
 
-	if (!fqdir->high_thresh || frag_mem_limit(fqdir) > fqdir->high_thresh)
+	if (!high_thresh || frag_mem_limit(fqdir) > high_thresh)
 		return NULL;
 
 	rcu_read_lock();
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 006a34b..e093847 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -20,6 +20,9 @@
 #include <net/addrconf.h>
 #include <net/inet_connection_sock.h>
 #include <net/inet_hashtables.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/inet6_hashtables.h>
+#endif
 #include <net/secure_seq.h>
 #include <net/ip.h>
 #include <net/tcp.h>
@@ -228,7 +231,7 @@
 
 static inline int compute_score(struct sock *sk, struct net *net,
 				const unsigned short hnum, const __be32 daddr,
-				const int dif, const int sdif, bool exact_dif)
+				const int dif, const int sdif)
 {
 	int score = -1;
 
@@ -239,14 +242,31 @@
 
 		if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
 			return -1;
+		score =  sk->sk_bound_dev_if ? 2 : 1;
 
-		score = sk->sk_family == PF_INET ? 2 : 1;
+		if (sk->sk_family == PF_INET)
+			score++;
 		if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
 			score++;
 	}
 	return score;
 }
 
+static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
+					    struct sk_buff *skb, int doff,
+					    __be32 saddr, __be16 sport,
+					    __be32 daddr, unsigned short hnum)
+{
+	struct sock *reuse_sk = NULL;
+	u32 phash;
+
+	if (sk->sk_reuseport) {
+		phash = inet_ehashfn(net, daddr, hnum, saddr, sport);
+		reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
+	}
+	return reuse_sk;
+}
+
 /*
  * Here are some nice properties to exploit here. The BSD API
  * does not allow a listening sock to specify the remote port nor the
@@ -262,25 +282,19 @@
 				const __be32 daddr, const unsigned short hnum,
 				const int dif, const int sdif)
 {
-	bool exact_dif = inet_exact_dif_match(net, skb);
 	struct inet_connection_sock *icsk;
 	struct sock *sk, *result = NULL;
 	int score, hiscore = 0;
-	u32 phash = 0;
 
 	inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) {
 		sk = (struct sock *)icsk;
-		score = compute_score(sk, net, hnum, daddr,
-				      dif, sdif, exact_dif);
+		score = compute_score(sk, net, hnum, daddr, dif, sdif);
 		if (score > hiscore) {
-			if (sk->sk_reuseport) {
-				phash = inet_ehashfn(net, daddr, hnum,
-						     saddr, sport);
-				result = reuseport_select_sock(sk, phash,
-							       skb, doff);
-				if (result)
-					return result;
-			}
+			result = lookup_reuseport(net, sk, skb, doff,
+						  saddr, sport, daddr, hnum);
+			if (result)
+				return result;
+
 			result = sk;
 			hiscore = score;
 		}
@@ -289,6 +303,29 @@
 	return result;
 }
 
+static inline struct sock *inet_lookup_run_bpf(struct net *net,
+					       struct inet_hashinfo *hashinfo,
+					       struct sk_buff *skb, int doff,
+					       __be32 saddr, __be16 sport,
+					       __be32 daddr, u16 hnum)
+{
+	struct sock *sk, *reuse_sk;
+	bool no_reuseport;
+
+	if (hashinfo != &tcp_hashinfo)
+		return NULL; /* only TCP is supported */
+
+	no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_TCP,
+					    saddr, sport, daddr, hnum, &sk);
+	if (no_reuseport || IS_ERR_OR_NULL(sk))
+		return sk;
+
+	reuse_sk = lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
+	if (reuse_sk)
+		sk = reuse_sk;
+	return sk;
+}
+
 struct sock *__inet_lookup_listener(struct net *net,
 				    struct inet_hashinfo *hashinfo,
 				    struct sk_buff *skb, int doff,
@@ -300,6 +337,14 @@
 	struct sock *result = NULL;
 	unsigned int hash2;
 
+	/* Lookup redirect from BPF */
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
+		result = inet_lookup_run_bpf(net, hashinfo, skb, doff,
+					     saddr, sport, daddr, hnum);
+		if (result)
+			goto done;
+	}
+
 	hash2 = ipv4_portaddr_hash(net, daddr, hnum);
 	ilb2 = inet_lhash2_bucket(hashinfo, hash2);
 
@@ -468,10 +513,52 @@
 					  inet->inet_dport);
 }
 
-/* insert a socket into ehash, and eventually remove another one
- * (The another one can be a SYN_RECV or TIMEWAIT
+/* Searches for an exsiting socket in the ehash bucket list.
+ * Returns true if found, false otherwise.
  */
-bool inet_ehash_insert(struct sock *sk, struct sock *osk)
+static bool inet_ehash_lookup_by_sk(struct sock *sk,
+				    struct hlist_nulls_head *list)
+{
+	const __portpair ports = INET_COMBINED_PORTS(sk->sk_dport, sk->sk_num);
+	const int sdif = sk->sk_bound_dev_if;
+	const int dif = sk->sk_bound_dev_if;
+	const struct hlist_nulls_node *node;
+	struct net *net = sock_net(sk);
+	struct sock *esk;
+
+	INET_ADDR_COOKIE(acookie, sk->sk_daddr, sk->sk_rcv_saddr);
+
+	sk_nulls_for_each_rcu(esk, node, list) {
+		if (esk->sk_hash != sk->sk_hash)
+			continue;
+		if (sk->sk_family == AF_INET) {
+			if (unlikely(INET_MATCH(esk, net, acookie,
+						sk->sk_daddr,
+						sk->sk_rcv_saddr,
+						ports, dif, sdif))) {
+				return true;
+			}
+		}
+#if IS_ENABLED(CONFIG_IPV6)
+		else if (sk->sk_family == AF_INET6) {
+			if (unlikely(INET6_MATCH(esk, net,
+						 &sk->sk_v6_daddr,
+						 &sk->sk_v6_rcv_saddr,
+						 ports, dif, sdif))) {
+				return true;
+			}
+		}
+#endif
+	}
+	return false;
+}
+
+/* Insert a socket into ehash, and eventually remove another one
+ * (The another one can be a SYN_RECV or TIMEWAIT)
+ * If an existing socket already exists, socket sk is not inserted,
+ * and sets found_dup_sk parameter to true.
+ */
+bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk)
 {
 	struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
 	struct hlist_nulls_head *list;
@@ -490,21 +577,28 @@
 	if (osk) {
 		WARN_ON_ONCE(sk->sk_hash != osk->sk_hash);
 		ret = sk_nulls_del_node_init_rcu(osk);
+	} else if (found_dup_sk) {
+		*found_dup_sk = inet_ehash_lookup_by_sk(sk, list);
+		if (*found_dup_sk)
+			ret = false;
 	}
+
 	if (ret)
 		__sk_nulls_add_node_rcu(sk, list);
+
 	spin_unlock(lock);
+
 	return ret;
 }
 
-bool inet_ehash_nolisten(struct sock *sk, struct sock *osk)
+bool inet_ehash_nolisten(struct sock *sk, struct sock *osk, bool *found_dup_sk)
 {
-	bool ok = inet_ehash_insert(sk, osk);
+	bool ok = inet_ehash_insert(sk, osk, found_dup_sk);
 
 	if (ok) {
 		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 	} else {
-		percpu_counter_inc(sk->sk_prot->orphan_count);
+		this_cpu_inc(*sk->sk_prot->orphan_count);
 		inet_sk_set_state(sk, TCP_CLOSE);
 		sock_set_flag(sk, SOCK_DEAD);
 		inet_csk_destroy_sock(sk);
@@ -543,7 +637,7 @@
 	int err = 0;
 
 	if (sk->sk_state != TCP_LISTEN) {
-		inet_ehash_nolisten(sk, osk);
+		inet_ehash_nolisten(sk, osk, NULL);
 		return 0;
 	}
 	WARN_ON(!sk_unhashed(sk));
@@ -639,7 +733,7 @@
 		tb = inet_csk(sk)->icsk_bind_hash;
 		spin_lock_bh(&head->lock);
 		if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
-			inet_ehash_nolisten(sk, NULL);
+			inet_ehash_nolisten(sk, NULL, NULL);
 			spin_unlock_bh(&head->lock);
 			return 0;
 		}
@@ -718,7 +812,7 @@
 	inet_bind_hash(sk, tb, port);
 	if (sk_unhashed(sk)) {
 		inet_sk(sk)->inet_sport = htons(port);
-		inet_ehash_nolisten(sk, (struct sock *)tw);
+		inet_ehash_nolisten(sk, (struct sock *)tw, NULL);
 	}
 	if (tw)
 		inet_twsk_bind_unhash(tw, hinfo);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index cfeb889..fad803d 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -144,7 +144,8 @@
 
 	rcu_read_lock();
 
-	if (qp->q.fqdir->dead)
+	/* Paired with WRITE_ONCE() in fqdir_pre_exit(). */
+	if (READ_ONCE(qp->q.fqdir->dead))
 		goto out_rcu_unlock;
 
 	spin_lock(&qp->q.lock);
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index c4989e5..e4504dd 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -248,6 +248,15 @@
 	ipgre_err(skb, info, &tpi);
 }
 
+static bool is_erspan_type1(int gre_hdr_len)
+{
+	/* Both ERSPAN type I (version 0) and type II (version 1) use
+	 * protocol 0x88BE, but the type I has only 4-byte GRE header,
+	 * while type II has 8-byte.
+	 */
+	return gre_hdr_len == 4;
+}
+
 static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
 		      int gre_hdr_len)
 {
@@ -262,17 +271,26 @@
 	int len;
 
 	itn = net_generic(net, erspan_net_id);
-
 	iph = ip_hdr(skb);
-	ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len);
-	ver = ershdr->ver;
-
-	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,
-				  tpi->flags | TUNNEL_KEY,
-				  iph->saddr, iph->daddr, tpi->key);
+	if (is_erspan_type1(gre_hdr_len)) {
+		ver = 0;
+		tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,
+					  tpi->flags | TUNNEL_NO_KEY,
+					  iph->saddr, iph->daddr, 0);
+	} else {
+		ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len);
+		ver = ershdr->ver;
+		tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,
+					  tpi->flags | TUNNEL_KEY,
+					  iph->saddr, iph->daddr, tpi->key);
+	}
 
 	if (tunnel) {
-		len = gre_hdr_len + erspan_hdr_len(ver);
+		if (is_erspan_type1(gre_hdr_len))
+			len = gre_hdr_len;
+		else
+			len = gre_hdr_len + erspan_hdr_len(ver);
+
 		if (unlikely(!pskb_may_pull(skb, len)))
 			return PACKET_REJECT;
 
@@ -340,6 +358,8 @@
 				  iph->saddr, iph->daddr, tpi->key);
 
 	if (tunnel) {
+		const struct iphdr *tnl_params;
+
 		if (__iptunnel_pull_header(skb, hdr_len, tpi->proto,
 					   raw_proto, false) < 0)
 			goto drop;
@@ -348,7 +368,9 @@
 			skb_pop_mac_header(skb);
 		else
 			skb_reset_mac_header(skb);
-		if (tunnel->collect_md) {
+
+		tnl_params = &tunnel->parms.iph;
+		if (tunnel->collect_md || tnl_params->daddr == 0) {
 			__be16 flags;
 			__be64 tun_id;
 
@@ -577,8 +599,9 @@
 
 	key = &info->key;
 	ip_tunnel_init_flow(&fl4, IPPROTO_GRE, key->u.ipv4.dst, key->u.ipv4.src,
-			    tunnel_id_to_key32(key->tun_id), key->tos, 0,
-			    skb->mark, skb_get_hash(skb));
+			    tunnel_id_to_key32(key->tun_id),
+			    key->tos & ~INET_ECN_MASK, 0, skb->mark,
+			    skb_get_hash(skb));
 	rt = ip_route_output_key(dev_net(dev), &fl4);
 	if (IS_ERR(rt))
 		return PTR_ERR(rt);
@@ -664,7 +687,10 @@
 	}
 
 	/* Push ERSPAN header */
-	if (tunnel->erspan_ver == 1) {
+	if (tunnel->erspan_ver == 0) {
+		proto = htons(ETH_P_ERSPAN);
+		tunnel->parms.o_flags &= ~TUNNEL_SEQ;
+	} else if (tunnel->erspan_ver == 1) {
 		erspan_build_header(skb, ntohl(tunnel->parms.o_key),
 				    tunnel->index,
 				    truncate, true);
@@ -750,45 +776,37 @@
 	}
 }
 
-static int ipgre_tunnel_ioctl(struct net_device *dev,
-			      struct ifreq *ifr, int cmd)
+static int ipgre_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p,
+			    int cmd)
 {
-	struct ip_tunnel_parm p;
 	int err;
 
-	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
-		return -EFAULT;
-
 	if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
-		if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE ||
-		    p.iph.ihl != 5 || (p.iph.frag_off & htons(~IP_DF)) ||
-		    ((p.i_flags | p.o_flags) & (GRE_VERSION | GRE_ROUTING)))
+		if (p->iph.version != 4 || p->iph.protocol != IPPROTO_GRE ||
+		    p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)) ||
+		    ((p->i_flags | p->o_flags) & (GRE_VERSION | GRE_ROUTING)))
 			return -EINVAL;
 	}
 
-	p.i_flags = gre_flags_to_tnl_flags(p.i_flags);
-	p.o_flags = gre_flags_to_tnl_flags(p.o_flags);
+	p->i_flags = gre_flags_to_tnl_flags(p->i_flags);
+	p->o_flags = gre_flags_to_tnl_flags(p->o_flags);
 
-	err = ip_tunnel_ioctl(dev, &p, cmd);
+	err = ip_tunnel_ctl(dev, p, cmd);
 	if (err)
 		return err;
 
 	if (cmd == SIOCCHGTUNNEL) {
 		struct ip_tunnel *t = netdev_priv(dev);
 
-		t->parms.i_flags = p.i_flags;
-		t->parms.o_flags = p.o_flags;
+		t->parms.i_flags = p->i_flags;
+		t->parms.o_flags = p->o_flags;
 
 		if (strcmp(dev->rtnl_link_ops->kind, "erspan"))
 			ipgre_link_update(dev, true);
 	}
 
-	p.i_flags = gre_tnl_flags_to_gre_flags(p.i_flags);
-	p.o_flags = gre_tnl_flags_to_gre_flags(p.o_flags);
-
-	if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
-		return -EFAULT;
-
+	p->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
+	p->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
 	return 0;
 }
 
@@ -906,10 +924,11 @@
 	.ndo_stop		= ipgre_close,
 #endif
 	.ndo_start_xmit		= ipgre_xmit,
-	.ndo_do_ioctl		= ipgre_tunnel_ioctl,
+	.ndo_do_ioctl		= ip_tunnel_ioctl,
 	.ndo_change_mtu		= ip_tunnel_change_mtu,
 	.ndo_get_stats64	= ip_tunnel_get_stats64,
 	.ndo_get_iflink		= ip_tunnel_get_iflink,
+	.ndo_tunnel_ctl		= ipgre_tunnel_ctl,
 };
 
 #define GRE_FEATURES (NETIF_F_SG |		\
@@ -1074,7 +1093,11 @@
 	if (ret)
 		return ret;
 
-	/* ERSPAN should only have GRE sequence and key flag */
+	if (data[IFLA_GRE_ERSPAN_VER] &&
+	    nla_get_u8(data[IFLA_GRE_ERSPAN_VER]) == 0)
+		return 0;
+
+	/* ERSPAN type II/III should only have GRE sequence and key flag */
 	if (data[IFLA_GRE_OFLAGS])
 		flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
 	if (data[IFLA_GRE_IFLAGS])
@@ -1182,7 +1205,7 @@
 	if (data[IFLA_GRE_ERSPAN_VER]) {
 		t->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
 
-		if (t->erspan_ver != 1 && t->erspan_ver != 2)
+		if (t->erspan_ver > 2)
 			return -EINVAL;
 	}
 
@@ -1267,7 +1290,11 @@
 {
 	struct ip_tunnel *tunnel = netdev_priv(dev);
 
-	tunnel->tun_hlen = 8;
+	if (tunnel->erspan_ver == 0)
+		tunnel->tun_hlen = 4; /* 4-byte GRE hdr. */
+	else
+		tunnel->tun_hlen = 8; /* 8-byte GRE hdr. */
+
 	tunnel->parms.iph.protocol = IPPROTO_GRE;
 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
 		       erspan_hdr_len(tunnel->erspan_ver);
@@ -1464,8 +1491,8 @@
 	struct ip_tunnel_parm *p = &t->parms;
 	__be16 o_flags = p->o_flags;
 
-	if (t->erspan_ver == 1 || t->erspan_ver == 2) {
-		if (!t->collect_md)
+	if (t->erspan_ver <= 2) {
+		if (t->erspan_ver != 0 && !t->collect_md)
 			o_flags |= TUNNEL_KEY;
 
 		if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, t->erspan_ver))
@@ -1474,7 +1501,7 @@
 		if (t->erspan_ver == 1) {
 			if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index))
 				goto nla_put_failure;
-		} else {
+		} else if (t->erspan_ver == 2) {
 			if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, t->dir))
 				goto nla_put_failure;
 			if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, t->hwid))
@@ -1541,8 +1568,8 @@
 	[IFLA_GRE_OFLAGS]	= { .type = NLA_U16 },
 	[IFLA_GRE_IKEY]		= { .type = NLA_U32 },
 	[IFLA_GRE_OKEY]		= { .type = NLA_U32 },
-	[IFLA_GRE_LOCAL]	= { .len = FIELD_SIZEOF(struct iphdr, saddr) },
-	[IFLA_GRE_REMOTE]	= { .len = FIELD_SIZEOF(struct iphdr, daddr) },
+	[IFLA_GRE_LOCAL]	= { .len = sizeof_field(struct iphdr, saddr) },
+	[IFLA_GRE_REMOTE]	= { .len = sizeof_field(struct iphdr, daddr) },
 	[IFLA_GRE_TTL]		= { .type = NLA_U8 },
 	[IFLA_GRE_TOS]		= { .type = NLA_U8 },
 	[IFLA_GRE_PMTUDISC]	= { .type = NLA_U8 },
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index c59a78a..b0c244a 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -302,16 +302,31 @@
 	return true;
 }
 
+static bool ip_can_use_hint(const struct sk_buff *skb, const struct iphdr *iph,
+			    const struct sk_buff *hint)
+{
+	return hint && !skb_dst(skb) && ip_hdr(hint)->daddr == iph->daddr &&
+	       ip_hdr(hint)->tos == iph->tos;
+}
+
 INDIRECT_CALLABLE_DECLARE(int udp_v4_early_demux(struct sk_buff *));
 INDIRECT_CALLABLE_DECLARE(int tcp_v4_early_demux(struct sk_buff *));
 static int ip_rcv_finish_core(struct net *net, struct sock *sk,
-			      struct sk_buff *skb, struct net_device *dev)
+			      struct sk_buff *skb, struct net_device *dev,
+			      const struct sk_buff *hint)
 {
 	const struct iphdr *iph = ip_hdr(skb);
 	int (*edemux)(struct sk_buff *skb);
 	struct rtable *rt;
 	int err;
 
+	if (ip_can_use_hint(skb, iph, hint)) {
+		err = ip_route_use_hint(skb, iph->daddr, iph->saddr, iph->tos,
+					dev, hint);
+		if (unlikely(err))
+			goto drop_error;
+	}
+
 	if (net->ipv4.sysctl_ip_early_demux &&
 	    !skb_dst(skb) &&
 	    !skb->sk &&
@@ -408,7 +423,7 @@
 	if (!skb)
 		return NET_RX_SUCCESS;
 
-	ret = ip_rcv_finish_core(net, sk, skb, dev);
+	ret = ip_rcv_finish_core(net, sk, skb, dev, NULL);
 	if (ret != NET_RX_DROP)
 		ret = dst_input(skb);
 	return ret;
@@ -494,7 +509,8 @@
 	IPCB(skb)->iif = skb->skb_iif;
 
 	/* Must drop socket now because of tproxy. */
-	skb_orphan(skb);
+	if (!skb_sk_is_prefetched(skb))
+		skb_orphan(skb);
 
 	return skb;
 
@@ -535,11 +551,20 @@
 	}
 }
 
+static struct sk_buff *ip_extract_route_hint(const struct net *net,
+					     struct sk_buff *skb, int rt_type)
+{
+	if (fib4_has_custom_rules(net) || rt_type == RTN_BROADCAST)
+		return NULL;
+
+	return skb;
+}
+
 static void ip_list_rcv_finish(struct net *net, struct sock *sk,
 			       struct list_head *head)
 {
+	struct sk_buff *skb, *next, *hint = NULL;
 	struct dst_entry *curr_dst = NULL;
-	struct sk_buff *skb, *next;
 	struct list_head sublist;
 
 	INIT_LIST_HEAD(&sublist);
@@ -554,11 +579,14 @@
 		skb = l3mdev_ip_rcv(skb);
 		if (!skb)
 			continue;
-		if (ip_rcv_finish_core(net, sk, skb, dev) == NET_RX_DROP)
+		if (ip_rcv_finish_core(net, sk, skb, dev, hint) == NET_RX_DROP)
 			continue;
 
 		dst = skb_dst(skb);
 		if (curr_dst != dst) {
+			hint = ip_extract_route_hint(net, skb,
+					       ((struct rtable *)dst)->rt_type);
+
 			/* dispatch old sublist */
 			if (!list_empty(&sublist))
 				ip_sublist_rcv_finish(&sublist);
@@ -611,5 +639,6 @@
 		list_add_tail(&skb->list, &sublist);
 	}
 	/* dispatch final sublist */
-	ip_sublist_rcv(&sublist, curr_dev, curr_net);
+	if (!list_empty(&sublist))
+		ip_sublist_rcv(&sublist, curr_dev, curr_net);
 }
diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
index ddaa01e..da1b503 100644
--- a/net/ipv4/ip_options.c
+++ b/net/ipv4/ip_options.c
@@ -47,32 +47,32 @@
 	unsigned char *iph = skb_network_header(skb);
 
 	memcpy(&(IPCB(skb)->opt), opt, sizeof(struct ip_options));
-	memcpy(iph+sizeof(struct iphdr), opt->__data, opt->optlen);
+	memcpy(iph + sizeof(struct iphdr), opt->__data, opt->optlen);
 	opt = &(IPCB(skb)->opt);
 
 	if (opt->srr)
-		memcpy(iph+opt->srr+iph[opt->srr+1]-4, &daddr, 4);
+		memcpy(iph + opt->srr + iph[opt->srr + 1] - 4, &daddr, 4);
 
 	if (!is_frag) {
 		if (opt->rr_needaddr)
-			ip_rt_get_source(iph+opt->rr+iph[opt->rr+2]-5, skb, rt);
+			ip_rt_get_source(iph + opt->rr + iph[opt->rr + 2] - 5, skb, rt);
 		if (opt->ts_needaddr)
-			ip_rt_get_source(iph+opt->ts+iph[opt->ts+2]-9, skb, rt);
+			ip_rt_get_source(iph + opt->ts + iph[opt->ts + 2] - 9, skb, rt);
 		if (opt->ts_needtime) {
 			__be32 midtime;
 
 			midtime = inet_current_timestamp();
-			memcpy(iph+opt->ts+iph[opt->ts+2]-5, &midtime, 4);
+			memcpy(iph + opt->ts + iph[opt->ts + 2] - 5, &midtime, 4);
 		}
 		return;
 	}
 	if (opt->rr) {
-		memset(iph+opt->rr, IPOPT_NOP, iph[opt->rr+1]);
+		memset(iph + opt->rr, IPOPT_NOP, iph[opt->rr + 1]);
 		opt->rr = 0;
 		opt->rr_needaddr = 0;
 	}
 	if (opt->ts) {
-		memset(iph+opt->ts, IPOPT_NOP, iph[opt->ts+1]);
+		memset(iph + opt->ts, IPOPT_NOP, iph[opt->ts + 1]);
 		opt->ts = 0;
 		opt->ts_needaddr = opt->ts_needtime = 0;
 	}
@@ -495,39 +495,47 @@
 void ip_options_undo(struct ip_options *opt)
 {
 	if (opt->srr) {
-		unsigned  char *optptr = opt->__data+opt->srr-sizeof(struct  iphdr);
-		memmove(optptr+7, optptr+3, optptr[1]-7);
-		memcpy(optptr+3, &opt->faddr, 4);
+		unsigned char *optptr = opt->__data + opt->srr - sizeof(struct iphdr);
+
+		memmove(optptr + 7, optptr + 3, optptr[1] - 7);
+		memcpy(optptr + 3, &opt->faddr, 4);
 	}
 	if (opt->rr_needaddr) {
-		unsigned  char *optptr = opt->__data+opt->rr-sizeof(struct  iphdr);
+		unsigned char *optptr = opt->__data + opt->rr - sizeof(struct iphdr);
+
 		optptr[2] -= 4;
-		memset(&optptr[optptr[2]-1], 0, 4);
+		memset(&optptr[optptr[2] - 1], 0, 4);
 	}
 	if (opt->ts) {
-		unsigned  char *optptr = opt->__data+opt->ts-sizeof(struct  iphdr);
+		unsigned char *optptr = opt->__data + opt->ts - sizeof(struct iphdr);
+
 		if (opt->ts_needtime) {
 			optptr[2] -= 4;
-			memset(&optptr[optptr[2]-1], 0, 4);
-			if ((optptr[3]&0xF) == IPOPT_TS_PRESPEC)
+			memset(&optptr[optptr[2] - 1], 0, 4);
+			if ((optptr[3] & 0xF) == IPOPT_TS_PRESPEC)
 				optptr[2] -= 4;
 		}
 		if (opt->ts_needaddr) {
 			optptr[2] -= 4;
-			memset(&optptr[optptr[2]-1], 0, 4);
+			memset(&optptr[optptr[2] - 1], 0, 4);
 		}
 	}
 }
 
-static struct ip_options_rcu *ip_options_get_alloc(const int optlen)
+int ip_options_get(struct net *net, struct ip_options_rcu **optp,
+		   sockptr_t data, int optlen)
 {
-	return kzalloc(sizeof(struct ip_options_rcu) + ((optlen + 3) & ~3),
-		       GFP_KERNEL);
-}
+	struct ip_options_rcu *opt;
 
-static int ip_options_get_finish(struct net *net, struct ip_options_rcu **optp,
-				 struct ip_options_rcu *opt, int optlen)
-{
+	opt = kzalloc(sizeof(struct ip_options_rcu) + ((optlen + 3) & ~3),
+		       GFP_KERNEL);
+	if (!opt)
+		return -ENOMEM;
+	if (optlen && copy_from_sockptr(opt->opt.__data, data, optlen)) {
+		kfree(opt);
+		return -EFAULT;
+	}
+
 	while (optlen & 3)
 		opt->opt.__data[optlen++] = IPOPT_END;
 	opt->opt.optlen = optlen;
@@ -540,32 +548,6 @@
 	return 0;
 }
 
-int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
-			     unsigned char __user *data, int optlen)
-{
-	struct ip_options_rcu *opt = ip_options_get_alloc(optlen);
-
-	if (!opt)
-		return -ENOMEM;
-	if (optlen && copy_from_user(opt->opt.__data, data, optlen)) {
-		kfree(opt);
-		return -EFAULT;
-	}
-	return ip_options_get_finish(net, optp, opt, optlen);
-}
-
-int ip_options_get(struct net *net, struct ip_options_rcu **optp,
-		   unsigned char *data, int optlen)
-{
-	struct ip_options_rcu *opt = ip_options_get_alloc(optlen);
-
-	if (!opt)
-		return -ENOMEM;
-	if (optlen)
-		memcpy(opt->opt.__data, data, optlen);
-	return ip_options_get_finish(net, optp, opt, optlen);
-}
-
 void ip_forward_options(struct sk_buff *skb)
 {
 	struct   ip_options *opt	= &(IPCB(skb)->opt);
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 0ec529d..5e48b3d 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -143,7 +143,8 @@
  *
  */
 int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
-			  __be32 saddr, __be32 daddr, struct ip_options_rcu *opt)
+			  __be32 saddr, __be32 daddr, struct ip_options_rcu *opt,
+			  u8 tos)
 {
 	struct inet_sock *inet = inet_sk(sk);
 	struct rtable *rt = skb_rtable(skb);
@@ -156,17 +157,24 @@
 	iph = ip_hdr(skb);
 	iph->version  = 4;
 	iph->ihl      = 5;
-	iph->tos      = inet->tos;
+	iph->tos      = tos;
 	iph->ttl      = ip_select_ttl(inet, &rt->dst);
 	iph->daddr    = (opt && opt->opt.srr ? opt->opt.faddr : daddr);
 	iph->saddr    = saddr;
 	iph->protocol = sk->sk_protocol;
-	if (ip_dont_fragment(sk, &rt->dst)) {
+	/* Do not bother generating IPID for small packets (eg SYNACK) */
+	if (skb->len <= IPV4_MIN_MTU || ip_dont_fragment(sk, &rt->dst)) {
 		iph->frag_off = htons(IP_DF);
 		iph->id = 0;
 	} else {
 		iph->frag_off = 0;
-		__ip_select_ident(net, iph, 1);
+		/* TCP packets here are SYNACK with fat IPv4/TCP options.
+		 * Avoid using the hashed IP ident generator.
+		 */
+		if (sk->sk_protocol == IPPROTO_TCP)
+			iph->id = (__force __be16)prandom_u32();
+		else
+			__ip_select_ident(net, iph, 1);
 	}
 
 	if (opt && opt->opt.optlen) {
@@ -241,8 +249,8 @@
 static int ip_finish_output_gso(struct net *net, struct sock *sk,
 				struct sk_buff *skb, unsigned int mtu)
 {
+	struct sk_buff *segs, *nskb;
 	netdev_features_t features;
-	struct sk_buff *segs;
 	int ret = 0;
 
 	/* common case: seglen is <= mtu
@@ -264,7 +272,7 @@
 	 *    insufficent MTU.
 	 */
 	features = netif_skb_features(skb);
-	BUILD_BUG_ON(sizeof(*IPCB(skb)) > SKB_SGO_CB_OFFSET);
+	BUILD_BUG_ON(sizeof(*IPCB(skb)) > SKB_GSO_CB_OFFSET);
 	segs = skb_gso_segment(skb, features & ~NETIF_F_GSO_MASK);
 	if (IS_ERR_OR_NULL(segs)) {
 		kfree_skb(skb);
@@ -273,8 +281,7 @@
 
 	consume_skb(skb);
 
-	do {
-		struct sk_buff *nskb = segs->next;
+	skb_list_walk_safe(segs, segs, nskb) {
 		int err;
 
 		skb_mark_not_on_list(segs);
@@ -282,8 +289,7 @@
 
 		if (err && ret == 0)
 			ret = err;
-		segs = nskb;
-	} while (segs);
+	}
 
 	return ret;
 }
@@ -336,7 +342,7 @@
 	switch (ret) {
 	case NET_XMIT_CN:
 		do_cn = true;
-		/* fall through */
+		fallthrough;
 	case NET_XMIT_SUCCESS:
 		break;
 	default:
@@ -423,7 +429,7 @@
 
 int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
-	struct net_device *dev = skb_dst(skb)->dev;
+	struct net_device *dev = skb_dst(skb)->dev, *indev = skb->dev;
 
 	IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
 
@@ -431,7 +437,7 @@
 	skb->protocol = htons(ETH_P_IP);
 
 	return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
-			    net, sk, skb, NULL, dev,
+			    net, sk, skb, indev, dev,
 			    ip_finish_output,
 			    !(IPCB(skb)->flags & IPSKB_REROUTED));
 }
@@ -543,6 +549,12 @@
 }
 EXPORT_SYMBOL(__ip_queue_xmit);
 
+int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl)
+{
+	return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos);
+}
+EXPORT_SYMBOL(ip_queue_xmit);
+
 static void ip_copy_metadata(struct sk_buff *to, struct sk_buff *from)
 {
 	to->pkt_type = from->pkt_type;
@@ -609,18 +621,6 @@
 }
 EXPORT_SYMBOL(ip_fraglist_init);
 
-static void ip_fraglist_ipcb_prepare(struct sk_buff *skb,
-				     struct ip_fraglist_iter *iter)
-{
-	struct sk_buff *to = iter->frag;
-
-	/* Copy the flags to each fragment. */
-	IPCB(to)->flags = IPCB(skb)->flags;
-
-	if (iter->offset == 0)
-		ip_options_fragment(to);
-}
-
 void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter)
 {
 	unsigned int hlen = iter->hlen;
@@ -666,7 +666,7 @@
 EXPORT_SYMBOL(ip_frag_init);
 
 static void ip_frag_ipcb(struct sk_buff *from, struct sk_buff *to,
-			 bool first_frag, struct ip_frag_state *state)
+			 bool first_frag)
 {
 	/* Copy the flags to each fragment. */
 	IPCB(to)->flags = IPCB(from)->flags;
@@ -845,8 +845,20 @@
 			/* Prepare header of the next frame,
 			 * before previous one went down. */
 			if (iter.frag) {
-				ip_fraglist_ipcb_prepare(skb, &iter);
+				bool first_frag = (iter.offset == 0);
+
+				IPCB(iter.frag)->flags = IPCB(skb)->flags;
 				ip_fraglist_prepare(skb, &iter);
+				if (first_frag && IPCB(skb)->opt.optlen) {
+					/* ipcb->opt is not populated for frags
+					 * coming from __ip_make_skb(),
+					 * ip_options_fragment() needs optlen
+					 */
+					IPCB(iter.frag)->opt.optlen =
+						IPCB(skb)->opt.optlen;
+					ip_options_fragment(iter.frag);
+					ip_send_check(iter.iph);
+				}
 			}
 
 			skb->tstamp = tstamp;
@@ -900,7 +912,7 @@
 			err = PTR_ERR(skb2);
 			goto fail;
 		}
-		ip_frag_ipcb(skb, skb2, first_frag, &state);
+		ip_frag_ipcb(skb, skb2, first_frag);
 
 		/*
 		 *	Put this fragment into the sending queue.
@@ -994,7 +1006,7 @@
 
 	fragheaderlen = sizeof(struct iphdr) + (opt ? opt->optlen : 0);
 	maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen;
-	maxnonfragsize = ip_sk_ignore_df(sk) ? 0xFFFF : mtu;
+	maxnonfragsize = ip_sk_ignore_df(sk) ? IP_MAX_MTU : mtu;
 
 	if (cork->length + length > maxnonfragsize - fragheaderlen) {
 		ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
@@ -1128,7 +1140,7 @@
 			if (fraggap) {
 				skb->csum = skb_copy_and_csum_bits(
 					skb_prev, maxfraglen,
-					data + transhdrlen, fraggap, 0);
+					data + transhdrlen, fraggap);
 				skb_prev->csum = csum_sub(skb_prev->csum,
 							  skb->csum);
 				data += fraggap;
@@ -1353,7 +1365,7 @@
 	if (cork->flags & IPCORK_OPT)
 		opt = cork->opt;
 
-	if (!(rt->dst.dev->features&NETIF_F_SG))
+	if (!(rt->dst.dev->features & NETIF_F_SG))
 		return -EOPNOTSUPP;
 
 	hh_len = LL_RESERVED_SPACE(rt->dst.dev);
@@ -1413,7 +1425,7 @@
 				skb->csum = skb_copy_and_csum_bits(skb_prev,
 								   maxfraglen,
 						    skb_transport_header(skb),
-								   fraggap, 0);
+								   fraggap);
 				skb_prev->csum = csum_sub(skb_prev->csum,
 							  skb->csum);
 				pskb_trim_unique(skb_prev, maxfraglen);
@@ -1538,7 +1550,7 @@
 	ip_select_ident(net, skb, sk);
 
 	if (opt) {
-		iph->ihl += opt->optlen>>2;
+		iph->ihl += opt->optlen >> 2;
 		ip_options_build(skb, opt, cork->addr, rt, 0);
 	}
 
@@ -1650,7 +1662,7 @@
 {
 	__wsum csum;
 
-	csum = csum_partial_copy_nocheck(dptr+offset, to, len, 0);
+	csum = csum_partial_copy_nocheck(dptr+offset, to, len);
 	skb->csum = csum_block_add(skb->csum, csum, odd);
 	return 0;
 }
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index aa3fd61..ec60367 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -280,7 +280,8 @@
 			err = cmsg->cmsg_len - sizeof(struct cmsghdr);
 
 			/* Our caller is responsible for freeing ipc->opt */
-			err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
+			err = ip_options_get(net, &ipc->opt,
+					     KERNEL_SOCKPTR(CMSG_DATA(cmsg)),
 					     err < 40 ? err : 40);
 			if (err)
 				return err;
@@ -389,6 +390,18 @@
 	return 0;
 }
 
+static void ipv4_icmp_error_rfc4884(const struct sk_buff *skb,
+				    struct sock_ee_data_rfc4884 *out)
+{
+	switch (icmp_hdr(skb)->type) {
+	case ICMP_DEST_UNREACH:
+	case ICMP_TIME_EXCEEDED:
+	case ICMP_PARAMETERPROB:
+		ip_icmp_error_rfc4884(skb, out, sizeof(struct icmphdr),
+				      icmp_hdr(skb)->un.reserved[1] * 4);
+	}
+}
+
 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 		   __be16 port, u32 info, u8 *payload)
 {
@@ -411,6 +424,9 @@
 	serr->port = port;
 
 	if (skb_pull(skb, payload - skb->data)) {
+		if (inet_sk(sk)->recverr_rfc4884)
+			ipv4_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884);
+
 		skb_reset_transport_header(skb);
 		if (sock_queue_err_skb(sk, skb) == 0)
 			return;
@@ -560,6 +576,61 @@
 	return err;
 }
 
+static void __ip_sock_set_tos(struct sock *sk, int val)
+{
+	if (sk->sk_type == SOCK_STREAM) {
+		val &= ~INET_ECN_MASK;
+		val |= inet_sk(sk)->tos & INET_ECN_MASK;
+	}
+	if (inet_sk(sk)->tos != val) {
+		inet_sk(sk)->tos = val;
+		sk->sk_priority = rt_tos2priority(val);
+		sk_dst_reset(sk);
+	}
+}
+
+void ip_sock_set_tos(struct sock *sk, int val)
+{
+	lock_sock(sk);
+	__ip_sock_set_tos(sk, val);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(ip_sock_set_tos);
+
+void ip_sock_set_freebind(struct sock *sk)
+{
+	lock_sock(sk);
+	inet_sk(sk)->freebind = true;
+	release_sock(sk);
+}
+EXPORT_SYMBOL(ip_sock_set_freebind);
+
+void ip_sock_set_recverr(struct sock *sk)
+{
+	lock_sock(sk);
+	inet_sk(sk)->recverr = true;
+	release_sock(sk);
+}
+EXPORT_SYMBOL(ip_sock_set_recverr);
+
+int ip_sock_set_mtu_discover(struct sock *sk, int val)
+{
+	if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
+		return -EINVAL;
+	lock_sock(sk);
+	inet_sk(sk)->pmtudisc = val;
+	release_sock(sk);
+	return 0;
+}
+EXPORT_SYMBOL(ip_sock_set_mtu_discover);
+
+void ip_sock_set_pktinfo(struct sock *sk)
+{
+	lock_sock(sk);
+	inet_sk(sk)->cmsg_flags |= IP_CMSG_PKTINFO;
+	release_sock(sk);
+}
+EXPORT_SYMBOL(ip_sock_set_pktinfo);
 
 /*
  *	Socket option code for IP. This is the end of the line after any
@@ -587,8 +658,236 @@
 	return false;
 }
 
-static int do_ip_setsockopt(struct sock *sk, int level,
-			    int optname, char __user *optval, unsigned int optlen)
+static int set_mcast_msfilter(struct sock *sk, int ifindex,
+			      int numsrc, int fmode,
+			      struct sockaddr_storage *group,
+			      struct sockaddr_storage *list)
+{
+	int msize = IP_MSFILTER_SIZE(numsrc);
+	struct ip_msfilter *msf;
+	struct sockaddr_in *psin;
+	int err, i;
+
+	msf = kmalloc(msize, GFP_KERNEL);
+	if (!msf)
+		return -ENOBUFS;
+
+	psin = (struct sockaddr_in *)group;
+	if (psin->sin_family != AF_INET)
+		goto Eaddrnotavail;
+	msf->imsf_multiaddr = psin->sin_addr.s_addr;
+	msf->imsf_interface = 0;
+	msf->imsf_fmode = fmode;
+	msf->imsf_numsrc = numsrc;
+	for (i = 0; i < numsrc; ++i) {
+		psin = (struct sockaddr_in *)&list[i];
+
+		if (psin->sin_family != AF_INET)
+			goto Eaddrnotavail;
+		msf->imsf_slist[i] = psin->sin_addr.s_addr;
+	}
+	err = ip_mc_msfilter(sk, msf, ifindex);
+	kfree(msf);
+	return err;
+
+Eaddrnotavail:
+	kfree(msf);
+	return -EADDRNOTAVAIL;
+}
+
+static int copy_group_source_from_sockptr(struct group_source_req *greqs,
+		sockptr_t optval, int optlen)
+{
+	if (in_compat_syscall()) {
+		struct compat_group_source_req gr32;
+
+		if (optlen != sizeof(gr32))
+			return -EINVAL;
+		if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
+			return -EFAULT;
+		greqs->gsr_interface = gr32.gsr_interface;
+		greqs->gsr_group = gr32.gsr_group;
+		greqs->gsr_source = gr32.gsr_source;
+	} else {
+		if (optlen != sizeof(*greqs))
+			return -EINVAL;
+		if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+static int do_mcast_group_source(struct sock *sk, int optname,
+		sockptr_t optval, int optlen)
+{
+	struct group_source_req greqs;
+	struct ip_mreq_source mreqs;
+	struct sockaddr_in *psin;
+	int omode, add, err;
+
+	err = copy_group_source_from_sockptr(&greqs, optval, optlen);
+	if (err)
+		return err;
+
+	if (greqs.gsr_group.ss_family != AF_INET ||
+	    greqs.gsr_source.ss_family != AF_INET)
+		return -EADDRNOTAVAIL;
+
+	psin = (struct sockaddr_in *)&greqs.gsr_group;
+	mreqs.imr_multiaddr = psin->sin_addr.s_addr;
+	psin = (struct sockaddr_in *)&greqs.gsr_source;
+	mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
+	mreqs.imr_interface = 0; /* use index for mc_source */
+
+	if (optname == MCAST_BLOCK_SOURCE) {
+		omode = MCAST_EXCLUDE;
+		add = 1;
+	} else if (optname == MCAST_UNBLOCK_SOURCE) {
+		omode = MCAST_EXCLUDE;
+		add = 0;
+	} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
+		struct ip_mreqn mreq;
+
+		psin = (struct sockaddr_in *)&greqs.gsr_group;
+		mreq.imr_multiaddr = psin->sin_addr;
+		mreq.imr_address.s_addr = 0;
+		mreq.imr_ifindex = greqs.gsr_interface;
+		err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
+		if (err && err != -EADDRINUSE)
+			return err;
+		greqs.gsr_interface = mreq.imr_ifindex;
+		omode = MCAST_INCLUDE;
+		add = 1;
+	} else /* MCAST_LEAVE_SOURCE_GROUP */ {
+		omode = MCAST_INCLUDE;
+		add = 0;
+	}
+	return ip_mc_source(add, omode, sk, &mreqs, greqs.gsr_interface);
+}
+
+static int ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, int optlen)
+{
+	struct group_filter *gsf = NULL;
+	int err;
+
+	if (optlen < GROUP_FILTER_SIZE(0))
+		return -EINVAL;
+	if (optlen > sysctl_optmem_max)
+		return -ENOBUFS;
+
+	gsf = memdup_sockptr(optval, optlen);
+	if (IS_ERR(gsf))
+		return PTR_ERR(gsf);
+
+	/* numsrc >= (4G-140)/128 overflow in 32 bits */
+	err = -ENOBUFS;
+	if (gsf->gf_numsrc >= 0x1ffffff ||
+	    gsf->gf_numsrc > sock_net(sk)->ipv4.sysctl_igmp_max_msf)
+		goto out_free_gsf;
+
+	err = -EINVAL;
+	if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
+		goto out_free_gsf;
+
+	err = set_mcast_msfilter(sk, gsf->gf_interface, gsf->gf_numsrc,
+				 gsf->gf_fmode, &gsf->gf_group, gsf->gf_slist);
+out_free_gsf:
+	kfree(gsf);
+	return err;
+}
+
+static int compat_ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
+		int optlen)
+{
+	const int size0 = offsetof(struct compat_group_filter, gf_slist);
+	struct compat_group_filter *gf32;
+	unsigned int n;
+	void *p;
+	int err;
+
+	if (optlen < size0)
+		return -EINVAL;
+	if (optlen > sysctl_optmem_max - 4)
+		return -ENOBUFS;
+
+	p = kmalloc(optlen + 4, GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+	gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
+
+	err = -EFAULT;
+	if (copy_from_sockptr(gf32, optval, optlen))
+		goto out_free_gsf;
+
+	/* numsrc >= (4G-140)/128 overflow in 32 bits */
+	n = gf32->gf_numsrc;
+	err = -ENOBUFS;
+	if (n >= 0x1ffffff)
+		goto out_free_gsf;
+
+	err = -EINVAL;
+	if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen)
+		goto out_free_gsf;
+
+	/* numsrc >= (4G-140)/128 overflow in 32 bits */
+	err = -ENOBUFS;
+	if (n > sock_net(sk)->ipv4.sysctl_igmp_max_msf)
+		goto out_free_gsf;
+	err = set_mcast_msfilter(sk, gf32->gf_interface, n, gf32->gf_fmode,
+				 &gf32->gf_group, gf32->gf_slist);
+out_free_gsf:
+	kfree(p);
+	return err;
+}
+
+static int ip_mcast_join_leave(struct sock *sk, int optname,
+		sockptr_t optval, int optlen)
+{
+	struct ip_mreqn mreq = { };
+	struct sockaddr_in *psin;
+	struct group_req greq;
+
+	if (optlen < sizeof(struct group_req))
+		return -EINVAL;
+	if (copy_from_sockptr(&greq, optval, sizeof(greq)))
+		return -EFAULT;
+
+	psin = (struct sockaddr_in *)&greq.gr_group;
+	if (psin->sin_family != AF_INET)
+		return -EINVAL;
+	mreq.imr_multiaddr = psin->sin_addr;
+	mreq.imr_ifindex = greq.gr_interface;
+	if (optname == MCAST_JOIN_GROUP)
+		return ip_mc_join_group(sk, &mreq);
+	return ip_mc_leave_group(sk, &mreq);
+}
+
+static int compat_ip_mcast_join_leave(struct sock *sk, int optname,
+		sockptr_t optval, int optlen)
+{
+	struct compat_group_req greq;
+	struct ip_mreqn mreq = { };
+	struct sockaddr_in *psin;
+
+	if (optlen < sizeof(struct compat_group_req))
+		return -EINVAL;
+	if (copy_from_sockptr(&greq, optval, sizeof(greq)))
+		return -EFAULT;
+
+	psin = (struct sockaddr_in *)&greq.gr_group;
+	if (psin->sin_family != AF_INET)
+		return -EINVAL;
+	mreq.imr_multiaddr = psin->sin_addr;
+	mreq.imr_ifindex = greq.gr_interface;
+
+	if (optname == MCAST_JOIN_GROUP)
+		return ip_mc_join_group(sk, &mreq);
+	return ip_mc_leave_group(sk, &mreq);
+}
+
+static int do_ip_setsockopt(struct sock *sk, int level, int optname,
+		sockptr_t optval, unsigned int optlen)
 {
 	struct inet_sock *inet = inet_sk(sk);
 	struct net *net = sock_net(sk);
@@ -620,13 +919,14 @@
 	case IP_RECVORIGDSTADDR:
 	case IP_CHECKSUM:
 	case IP_RECVFRAGSIZE:
+	case IP_RECVERR_RFC4884:
 		if (optlen >= sizeof(int)) {
-			if (get_user(val, (int __user *) optval))
+			if (copy_from_sockptr(&val, optval, sizeof(val)))
 				return -EFAULT;
 		} else if (optlen >= sizeof(char)) {
 			unsigned char ucval;
 
-			if (get_user(ucval, (unsigned char __user *) optval))
+			if (copy_from_sockptr(&ucval, optval, sizeof(ucval)))
 				return -EFAULT;
 			val = (int) ucval;
 		}
@@ -651,8 +951,7 @@
 
 		if (optlen > 40)
 			goto e_inval;
-		err = ip_options_get_from_user(sock_net(sk), &opt,
-					       optval, optlen);
+		err = ip_options_get(sock_net(sk), &opt, optval, optlen);
 		if (err)
 			break;
 		old = rcu_dereference_protected(inet->inet_opt,
@@ -743,15 +1042,7 @@
 			inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
 		break;
 	case IP_TOS:	/* This sets both TOS and Precedence */
-		if (sk->sk_type == SOCK_STREAM) {
-			val &= ~INET_ECN_MASK;
-			val |= inet->tos & INET_ECN_MASK;
-		}
-		if (inet->tos != val) {
-			inet->tos = val;
-			sk->sk_priority = rt_tos2priority(val);
-			sk_dst_reset(sk);
-		}
+		__ip_sock_set_tos(sk, val);
 		break;
 	case IP_TTL:
 		if (optlen < 1)
@@ -787,6 +1078,11 @@
 		if (!val)
 			skb_queue_purge(&sk->sk_error_queue);
 		break;
+	case IP_RECVERR_RFC4884:
+		if (val < 0 || val > 1)
+			goto e_inval;
+		inet->recverr_rfc4884 = !!val;
+		break;
 	case IP_MULTICAST_TTL:
 		if (sk->sk_type == SOCK_STREAM)
 			goto e_inval;
@@ -828,8 +1124,7 @@
 		dev_put(dev);
 
 		err = -EINVAL;
-		if (sk->sk_bound_dev_if &&
-		    (!midx || midx != sk->sk_bound_dev_if))
+		if (sk->sk_bound_dev_if && midx != sk->sk_bound_dev_if)
 			break;
 
 		inet->uc_index = ifindex;
@@ -853,17 +1148,17 @@
 
 		err = -EFAULT;
 		if (optlen >= sizeof(struct ip_mreqn)) {
-			if (copy_from_user(&mreq, optval, sizeof(mreq)))
+			if (copy_from_sockptr(&mreq, optval, sizeof(mreq)))
 				break;
 		} else {
 			memset(&mreq, 0, sizeof(mreq));
 			if (optlen >= sizeof(struct ip_mreq)) {
-				if (copy_from_user(&mreq, optval,
-						   sizeof(struct ip_mreq)))
+				if (copy_from_sockptr(&mreq, optval,
+						      sizeof(struct ip_mreq)))
 					break;
 			} else if (optlen >= sizeof(struct in_addr)) {
-				if (copy_from_user(&mreq.imr_address, optval,
-						   sizeof(struct in_addr)))
+				if (copy_from_sockptr(&mreq.imr_address, optval,
+						      sizeof(struct in_addr)))
 					break;
 			}
 		}
@@ -893,7 +1188,7 @@
 		err = -EINVAL;
 		if (sk->sk_bound_dev_if &&
 		    mreq.imr_ifindex != sk->sk_bound_dev_if &&
-		    (!midx || midx != sk->sk_bound_dev_if))
+		    midx != sk->sk_bound_dev_if)
 			break;
 
 		inet->mc_index = mreq.imr_ifindex;
@@ -915,11 +1210,12 @@
 			goto e_inval;
 		err = -EFAULT;
 		if (optlen >= sizeof(struct ip_mreqn)) {
-			if (copy_from_user(&mreq, optval, sizeof(mreq)))
+			if (copy_from_sockptr(&mreq, optval, sizeof(mreq)))
 				break;
 		} else {
 			memset(&mreq, 0, sizeof(mreq));
-			if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
+			if (copy_from_sockptr(&mreq, optval,
+					      sizeof(struct ip_mreq)))
 				break;
 		}
 
@@ -939,7 +1235,7 @@
 			err = -ENOBUFS;
 			break;
 		}
-		msf = memdup_user(optval, optlen);
+		msf = memdup_sockptr(optval, optlen);
 		if (IS_ERR(msf)) {
 			err = PTR_ERR(msf);
 			break;
@@ -970,7 +1266,7 @@
 
 		if (optlen != sizeof(struct ip_mreq_source))
 			goto e_inval;
-		if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
+		if (copy_from_sockptr(&mreqs, optval, sizeof(mreqs))) {
 			err = -EFAULT;
 			break;
 		}
@@ -1000,145 +1296,24 @@
 	}
 	case MCAST_JOIN_GROUP:
 	case MCAST_LEAVE_GROUP:
-	{
-		struct group_req greq;
-		struct sockaddr_in *psin;
-		struct ip_mreqn mreq;
-
-		if (optlen < sizeof(struct group_req))
-			goto e_inval;
-		err = -EFAULT;
-		if (copy_from_user(&greq, optval, sizeof(greq)))
-			break;
-		psin = (struct sockaddr_in *)&greq.gr_group;
-		if (psin->sin_family != AF_INET)
-			goto e_inval;
-		memset(&mreq, 0, sizeof(mreq));
-		mreq.imr_multiaddr = psin->sin_addr;
-		mreq.imr_ifindex = greq.gr_interface;
-
-		if (optname == MCAST_JOIN_GROUP)
-			err = ip_mc_join_group(sk, &mreq);
+		if (in_compat_syscall())
+			err = compat_ip_mcast_join_leave(sk, optname, optval,
+							 optlen);
 		else
-			err = ip_mc_leave_group(sk, &mreq);
+			err = ip_mcast_join_leave(sk, optname, optval, optlen);
 		break;
-	}
 	case MCAST_JOIN_SOURCE_GROUP:
 	case MCAST_LEAVE_SOURCE_GROUP:
 	case MCAST_BLOCK_SOURCE:
 	case MCAST_UNBLOCK_SOURCE:
-	{
-		struct group_source_req greqs;
-		struct ip_mreq_source mreqs;
-		struct sockaddr_in *psin;
-		int omode, add;
-
-		if (optlen != sizeof(struct group_source_req))
-			goto e_inval;
-		if (copy_from_user(&greqs, optval, sizeof(greqs))) {
-			err = -EFAULT;
-			break;
-		}
-		if (greqs.gsr_group.ss_family != AF_INET ||
-		    greqs.gsr_source.ss_family != AF_INET) {
-			err = -EADDRNOTAVAIL;
-			break;
-		}
-		psin = (struct sockaddr_in *)&greqs.gsr_group;
-		mreqs.imr_multiaddr = psin->sin_addr.s_addr;
-		psin = (struct sockaddr_in *)&greqs.gsr_source;
-		mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
-		mreqs.imr_interface = 0; /* use index for mc_source */
-
-		if (optname == MCAST_BLOCK_SOURCE) {
-			omode = MCAST_EXCLUDE;
-			add = 1;
-		} else if (optname == MCAST_UNBLOCK_SOURCE) {
-			omode = MCAST_EXCLUDE;
-			add = 0;
-		} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
-			struct ip_mreqn mreq;
-
-			psin = (struct sockaddr_in *)&greqs.gsr_group;
-			mreq.imr_multiaddr = psin->sin_addr;
-			mreq.imr_address.s_addr = 0;
-			mreq.imr_ifindex = greqs.gsr_interface;
-			err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
-			if (err && err != -EADDRINUSE)
-				break;
-			greqs.gsr_interface = mreq.imr_ifindex;
-			omode = MCAST_INCLUDE;
-			add = 1;
-		} else /* MCAST_LEAVE_SOURCE_GROUP */ {
-			omode = MCAST_INCLUDE;
-			add = 0;
-		}
-		err = ip_mc_source(add, omode, sk, &mreqs,
-				   greqs.gsr_interface);
+		err = do_mcast_group_source(sk, optname, optval, optlen);
 		break;
-	}
 	case MCAST_MSFILTER:
-	{
-		struct sockaddr_in *psin;
-		struct ip_msfilter *msf = NULL;
-		struct group_filter *gsf = NULL;
-		int msize, i, ifindex;
-
-		if (optlen < GROUP_FILTER_SIZE(0))
-			goto e_inval;
-		if (optlen > sysctl_optmem_max) {
-			err = -ENOBUFS;
-			break;
-		}
-		gsf = memdup_user(optval, optlen);
-		if (IS_ERR(gsf)) {
-			err = PTR_ERR(gsf);
-			break;
-		}
-
-		/* numsrc >= (4G-140)/128 overflow in 32 bits */
-		if (gsf->gf_numsrc >= 0x1ffffff ||
-		    gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
-			err = -ENOBUFS;
-			goto mc_msf_out;
-		}
-		if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
-			err = -EINVAL;
-			goto mc_msf_out;
-		}
-		msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
-		msf = kmalloc(msize, GFP_KERNEL);
-		if (!msf) {
-			err = -ENOBUFS;
-			goto mc_msf_out;
-		}
-		ifindex = gsf->gf_interface;
-		psin = (struct sockaddr_in *)&gsf->gf_group;
-		if (psin->sin_family != AF_INET) {
-			err = -EADDRNOTAVAIL;
-			goto mc_msf_out;
-		}
-		msf->imsf_multiaddr = psin->sin_addr.s_addr;
-		msf->imsf_interface = 0;
-		msf->imsf_fmode = gsf->gf_fmode;
-		msf->imsf_numsrc = gsf->gf_numsrc;
-		err = -EADDRNOTAVAIL;
-		for (i = 0; i < gsf->gf_numsrc; ++i) {
-			psin = (struct sockaddr_in *)&gsf->gf_slist[i];
-
-			if (psin->sin_family != AF_INET)
-				goto mc_msf_out;
-			msf->imsf_slist[i] = psin->sin_addr.s_addr;
-		}
-		kfree(gsf);
-		gsf = NULL;
-
-		err = ip_mc_msfilter(sk, msf, ifindex);
-mc_msf_out:
-		kfree(msf);
-		kfree(gsf);
+		if (in_compat_syscall())
+			err = compat_ip_set_mcast_msfilter(sk, optval, optlen);
+		else
+			err = ip_set_mcast_msfilter(sk, optval, optlen);
 		break;
-	}
 	case IP_MULTICAST_ALL:
 		if (optlen < 1)
 			goto e_inval;
@@ -1237,8 +1412,8 @@
 	skb_dst_drop(skb);
 }
 
-int ip_setsockopt(struct sock *sk, int level,
-		int optname, char __user *optval, unsigned int optlen)
+int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		unsigned int optlen)
 {
 	int err;
 
@@ -1263,34 +1438,6 @@
 }
 EXPORT_SYMBOL(ip_setsockopt);
 
-#ifdef CONFIG_COMPAT
-int compat_ip_setsockopt(struct sock *sk, int level, int optname,
-			 char __user *optval, unsigned int optlen)
-{
-	int err;
-
-	if (level != SOL_IP)
-		return -ENOPROTOOPT;
-
-	if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
-		return compat_mc_setsockopt(sk, level, optname, optval, optlen,
-			ip_setsockopt);
-
-	err = do_ip_setsockopt(sk, level, optname, optval, optlen);
-#ifdef CONFIG_NETFILTER
-	/* we need to exclude all possible ENOPROTOOPTs except default case */
-	if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
-			optname != IP_IPSEC_POLICY &&
-			optname != IP_XFRM_POLICY &&
-			!ip_mroute_opt(optname))
-		err = compat_nf_setsockopt(sk, PF_INET, optname, optval,
-					   optlen);
-#endif
-	return err;
-}
-EXPORT_SYMBOL(compat_ip_setsockopt);
-#endif
-
 /*
  *	Get the options. Note for future reference. The GET of IP options gets
  *	the _received_ ones. The set sets the _sent_ ones.
@@ -1306,8 +1453,67 @@
 	return false;
 }
 
+static int ip_get_mcast_msfilter(struct sock *sk, void __user *optval,
+		int __user *optlen, int len)
+{
+	const int size0 = offsetof(struct group_filter, gf_slist);
+	struct group_filter __user *p = optval;
+	struct group_filter gsf;
+	int num;
+	int err;
+
+	if (len < size0)
+		return -EINVAL;
+	if (copy_from_user(&gsf, p, size0))
+		return -EFAULT;
+
+	num = gsf.gf_numsrc;
+	err = ip_mc_gsfget(sk, &gsf, p->gf_slist);
+	if (err)
+		return err;
+	if (gsf.gf_numsrc < num)
+		num = gsf.gf_numsrc;
+	if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
+	    copy_to_user(p, &gsf, size0))
+		return -EFAULT;
+	return 0;
+}
+
+static int compat_ip_get_mcast_msfilter(struct sock *sk, void __user *optval,
+		int __user *optlen, int len)
+{
+	const int size0 = offsetof(struct compat_group_filter, gf_slist);
+	struct compat_group_filter __user *p = optval;
+	struct compat_group_filter gf32;
+	struct group_filter gf;
+	int num;
+	int err;
+
+	if (len < size0)
+		return -EINVAL;
+	if (copy_from_user(&gf32, p, size0))
+		return -EFAULT;
+
+	gf.gf_interface = gf32.gf_interface;
+	gf.gf_fmode = gf32.gf_fmode;
+	num = gf.gf_numsrc = gf32.gf_numsrc;
+	gf.gf_group = gf32.gf_group;
+
+	err = ip_mc_gsfget(sk, &gf, p->gf_slist);
+	if (err)
+		return err;
+	if (gf.gf_numsrc < num)
+		num = gf.gf_numsrc;
+	len = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32));
+	if (put_user(len, optlen) ||
+	    put_user(gf.gf_fmode, &p->gf_fmode) ||
+	    put_user(gf.gf_numsrc, &p->gf_numsrc))
+		return -EFAULT;
+	return 0;
+}
+
 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
-			    char __user *optval, int __user *optlen, unsigned int flags)
+			    char __user *optval, int __user *optlen)
 {
 	struct inet_sock *inet = inet_sk(sk);
 	bool needs_rtnl = getsockopt_needs_rtnl(optname);
@@ -1425,6 +1631,9 @@
 	case IP_RECVERR:
 		val = inet->recverr;
 		break;
+	case IP_RECVERR_RFC4884:
+		val = inet->recverr_rfc4884;
+		break;
 	case IP_MULTICAST_TTL:
 		val = inet->mc_ttl;
 		break;
@@ -1464,22 +1673,12 @@
 		goto out;
 	}
 	case MCAST_MSFILTER:
-	{
-		struct group_filter gsf;
-
-		if (len < GROUP_FILTER_SIZE(0)) {
-			err = -EINVAL;
-			goto out;
-		}
-		if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
-			err = -EFAULT;
-			goto out;
-		}
-		err = ip_mc_gsfget(sk, &gsf,
-				   (struct group_filter __user *)optval,
-				   optlen);
+		if (in_compat_syscall())
+			err = compat_ip_get_mcast_msfilter(sk, optval, optlen,
+							   len);
+		else
+			err = ip_get_mcast_msfilter(sk, optval, optlen, len);
 		goto out;
-	}
 	case IP_MULTICAST_ALL:
 		val = inet->mc_all;
 		break;
@@ -1492,9 +1691,10 @@
 		if (sk->sk_type != SOCK_STREAM)
 			return -ENOPROTOOPT;
 
-		msg.msg_control = (__force void *) optval;
+		msg.msg_control_is_user = true;
+		msg.msg_control_user = optval;
 		msg.msg_controllen = len;
-		msg.msg_flags = flags;
+		msg.msg_flags = in_compat_syscall() ? MSG_CMSG_COMPAT : 0;
 
 		if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
 			struct in_pktinfo info;
@@ -1558,7 +1758,8 @@
 {
 	int err;
 
-	err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
+	err = do_ip_getsockopt(sk, level, optname, optval, optlen);
+
 #if IS_ENABLED(CONFIG_BPFILTER_UMH)
 	if (optname >= BPFILTER_IPT_SO_GET_INFO &&
 	    optname < BPFILTER_IPT_GET_MAX)
@@ -1582,41 +1783,3 @@
 	return err;
 }
 EXPORT_SYMBOL(ip_getsockopt);
-
-#ifdef CONFIG_COMPAT
-int compat_ip_getsockopt(struct sock *sk, int level, int optname,
-			 char __user *optval, int __user *optlen)
-{
-	int err;
-
-	if (optname == MCAST_MSFILTER)
-		return compat_mc_getsockopt(sk, level, optname, optval, optlen,
-			ip_getsockopt);
-
-	err = do_ip_getsockopt(sk, level, optname, optval, optlen,
-		MSG_CMSG_COMPAT);
-
-#if IS_ENABLED(CONFIG_BPFILTER_UMH)
-	if (optname >= BPFILTER_IPT_SO_GET_INFO &&
-	    optname < BPFILTER_IPT_GET_MAX)
-		err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen);
-#endif
-#ifdef CONFIG_NETFILTER
-	/* we need to exclude all possible ENOPROTOOPTs except default case */
-	if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
-			!ip_mroute_opt(optname)) {
-		int len;
-
-		if (get_user(len, optlen))
-			return -EFAULT;
-
-		err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
-		if (err >= 0)
-			err = put_user(len, optlen);
-		return err;
-	}
-#endif
-	return err;
-}
-EXPORT_SYMBOL(compat_ip_getsockopt);
-#endif
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 38d3095..be75b40 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -363,7 +363,6 @@
 		  const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
 		  bool log_ecn_error)
 {
-	struct pcpu_sw_netstats *tstats;
 	const struct iphdr *iph = ip_hdr(skb);
 	int err;
 
@@ -405,12 +404,7 @@
 		}
 	}
 
-	tstats = this_cpu_ptr(tunnel->dev->tstats);
-	u64_stats_update_begin(&tstats->syncp);
-	tstats->rx_packets++;
-	tstats->rx_bytes += skb->len;
-	u64_stats_update_end(&tstats->syncp);
-
+	dev_sw_netstats_rx_add(tunnel->dev, skb->len);
 	skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
 
 	if (tunnel->dev->type == ARPHRD_ETHER) {
@@ -514,8 +508,7 @@
 		if (!skb_is_gso(skb) &&
 		    (inner_iph->frag_off & htons(IP_DF)) &&
 		    mtu < pkt_size) {
-			memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
-			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
+			icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
 			return -E2BIG;
 		}
 	}
@@ -539,7 +532,7 @@
 
 		if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
 					mtu < pkt_size) {
-			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+			icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 			return -E2BIG;
 		}
 	}
@@ -863,7 +856,7 @@
 	netdev_state_change(dev);
 }
 
-int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
+int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
 {
 	int err = 0;
 	struct ip_tunnel *t = netdev_priv(dev);
@@ -963,6 +956,20 @@
 done:
 	return err;
 }
+EXPORT_SYMBOL_GPL(ip_tunnel_ctl);
+
+int ip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct ip_tunnel_parm p;
+	int err;
+
+	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+		return -EFAULT;
+	err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, cmd);
+	if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
+		return -EFAULT;
+	return err;
+}
 EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
 
 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict)
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 1452a97..e25be2d 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -25,6 +25,7 @@
 #include <net/protocol.h>
 #include <net/ip_tunnels.h>
 #include <net/ip6_tunnel.h>
+#include <net/ip6_checksum.h>
 #include <net/arp.h>
 #include <net/checksum.h>
 #include <net/dsfield.h>
@@ -34,6 +35,9 @@
 #include <net/netns/generic.h>
 #include <net/rtnetlink.h>
 #include <net/dst_metadata.h>
+#include <net/geneve.h>
+#include <net/vxlan.h>
+#include <net/erspan.h>
 
 const struct ip_tunnel_encap_ops __rcu *
 		iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
@@ -126,15 +130,14 @@
 
 	if (!md || md->type != METADATA_IP_TUNNEL ||
 	    md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
-
 		return NULL;
 
-	res = metadata_dst_alloc(0, METADATA_IP_TUNNEL, flags);
+	src = &md->u.tun_info;
+	res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags);
 	if (!res)
 		return NULL;
 
 	dst = &res->u.tun_info;
-	src = &md->u.tun_info;
 	dst->key.tun_id = src->key.tun_id;
 	if (src->mode & IP_TUNNEL_INFO_IPV6)
 		memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
@@ -143,6 +146,8 @@
 		dst->key.u.ipv4.dst = src->key.u.ipv4.src;
 	dst->key.tun_flags = src->key.tun_flags;
 	dst->mode = src->mode | IP_TUNNEL_INFO_TX;
+	ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src),
+				src->options_len, 0);
 
 	return res;
 }
@@ -180,61 +185,498 @@
 }
 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
 
+/**
+ * iptunnel_pmtud_build_icmp() - Build ICMP error message for PMTUD
+ * @skb:	Original packet with L2 header
+ * @mtu:	MTU value for ICMP error
+ *
+ * Return: length on success, negative error code if message couldn't be built.
+ */
+static int iptunnel_pmtud_build_icmp(struct sk_buff *skb, int mtu)
+{
+	const struct iphdr *iph = ip_hdr(skb);
+	struct icmphdr *icmph;
+	struct iphdr *niph;
+	struct ethhdr eh;
+	int len, err;
+
+	if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
+		return -EINVAL;
+
+	skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
+	pskb_pull(skb, ETH_HLEN);
+	skb_reset_network_header(skb);
+
+	err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph));
+	if (err)
+		return err;
+
+	len = skb->len + sizeof(*icmph);
+	err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN);
+	if (err)
+		return err;
+
+	icmph = skb_push(skb, sizeof(*icmph));
+	*icmph = (struct icmphdr) {
+		.type			= ICMP_DEST_UNREACH,
+		.code			= ICMP_FRAG_NEEDED,
+		.checksum		= 0,
+		.un.frag.__unused	= 0,
+		.un.frag.mtu		= ntohs(mtu),
+	};
+	icmph->checksum = ip_compute_csum(icmph, len);
+	skb_reset_transport_header(skb);
+
+	niph = skb_push(skb, sizeof(*niph));
+	*niph = (struct iphdr) {
+		.ihl			= sizeof(*niph) / 4u,
+		.version 		= 4,
+		.tos 			= 0,
+		.tot_len		= htons(len + sizeof(*niph)),
+		.id			= 0,
+		.frag_off		= htons(IP_DF),
+		.ttl			= iph->ttl,
+		.protocol		= IPPROTO_ICMP,
+		.saddr			= iph->daddr,
+		.daddr			= iph->saddr,
+	};
+	ip_send_check(niph);
+	skb_reset_network_header(skb);
+
+	skb->ip_summed = CHECKSUM_NONE;
+
+	eth_header(skb, skb->dev, htons(eh.h_proto), eh.h_source, eh.h_dest, 0);
+	skb_reset_mac_header(skb);
+
+	return skb->len;
+}
+
+/**
+ * iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed
+ * @skb:	Buffer being sent by encapsulation, L2 headers expected
+ * @mtu:	Network MTU for path
+ *
+ * Return: 0 for no ICMP reply, length if built, negative value on error.
+ */
+static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu)
+{
+	const struct icmphdr *icmph = icmp_hdr(skb);
+	const struct iphdr *iph = ip_hdr(skb);
+
+	if (mtu < 576 || iph->frag_off != htons(IP_DF))
+		return 0;
+
+	if (ipv4_is_lbcast(iph->daddr)  || ipv4_is_multicast(iph->daddr) ||
+	    ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr)  ||
+	    ipv4_is_lbcast(iph->saddr)  || ipv4_is_multicast(iph->saddr))
+		return 0;
+
+	if (iph->protocol == IPPROTO_ICMP && icmp_is_err(icmph->type))
+		return 0;
+
+	return iptunnel_pmtud_build_icmp(skb, mtu);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD
+ * @skb:	Original packet with L2 header
+ * @mtu:	MTU value for ICMPv6 error
+ *
+ * Return: length on success, negative error code if message couldn't be built.
+ */
+static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu)
+{
+	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+	struct icmp6hdr *icmp6h;
+	struct ipv6hdr *nip6h;
+	struct ethhdr eh;
+	int len, err;
+	__wsum csum;
+
+	if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
+		return -EINVAL;
+
+	skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
+	pskb_pull(skb, ETH_HLEN);
+	skb_reset_network_header(skb);
+
+	err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h));
+	if (err)
+		return err;
+
+	len = skb->len + sizeof(*icmp6h);
+	err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN);
+	if (err)
+		return err;
+
+	icmp6h = skb_push(skb, sizeof(*icmp6h));
+	*icmp6h = (struct icmp6hdr) {
+		.icmp6_type		= ICMPV6_PKT_TOOBIG,
+		.icmp6_code		= 0,
+		.icmp6_cksum		= 0,
+		.icmp6_mtu		= htonl(mtu),
+	};
+	skb_reset_transport_header(skb);
+
+	nip6h = skb_push(skb, sizeof(*nip6h));
+	*nip6h = (struct ipv6hdr) {
+		.priority		= 0,
+		.version		= 6,
+		.flow_lbl		= { 0 },
+		.payload_len		= htons(len),
+		.nexthdr		= IPPROTO_ICMPV6,
+		.hop_limit		= ip6h->hop_limit,
+		.saddr			= ip6h->daddr,
+		.daddr			= ip6h->saddr,
+	};
+	skb_reset_network_header(skb);
+
+	csum = csum_partial(icmp6h, len, 0);
+	icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len,
+					      IPPROTO_ICMPV6, csum);
+
+	skb->ip_summed = CHECKSUM_NONE;
+
+	eth_header(skb, skb->dev, htons(eh.h_proto), eh.h_source, eh.h_dest, 0);
+	skb_reset_mac_header(skb);
+
+	return skb->len;
+}
+
+/**
+ * iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed
+ * @skb:	Buffer being sent by encapsulation, L2 headers expected
+ * @mtu:	Network MTU for path
+ *
+ * Return: 0 for no ICMPv6 reply, length if built, negative value on error.
+ */
+static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu)
+{
+	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+	int stype = ipv6_addr_type(&ip6h->saddr);
+	u8 proto = ip6h->nexthdr;
+	__be16 frag_off;
+	int offset;
+
+	if (mtu < IPV6_MIN_MTU)
+		return 0;
+
+	if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST ||
+	    stype == IPV6_ADDR_LOOPBACK)
+		return 0;
+
+	offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto,
+				  &frag_off);
+	if (offset < 0 || (frag_off & htons(~0x7)))
+		return 0;
+
+	if (proto == IPPROTO_ICMPV6) {
+		struct icmp6hdr *icmp6h;
+
+		if (!pskb_may_pull(skb, skb_network_header(skb) +
+					offset + 1 - skb->data))
+			return 0;
+
+		icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset);
+		if (icmpv6_is_err(icmp6h->icmp6_type) ||
+		    icmp6h->icmp6_type == NDISC_REDIRECT)
+			return 0;
+	}
+
+	return iptunnel_pmtud_build_icmpv6(skb, mtu);
+}
+#endif /* IS_ENABLED(CONFIG_IPV6) */
+
+/**
+ * skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed
+ * @skb:	Buffer being sent by encapsulation, L2 headers expected
+ * @encap_dst:	Destination for tunnel encapsulation (outer IP)
+ * @headroom:	Encapsulation header size, bytes
+ * @reply:	Build matching ICMP or ICMPv6 message as a result
+ *
+ * L2 tunnel implementations that can carry IP and can be directly bridged
+ * (currently UDP tunnels) can't always rely on IP forwarding paths to handle
+ * PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built
+ * based on payload and sent back by the encapsulation itself.
+ *
+ * For routable interfaces, we just need to update the PMTU for the destination.
+ *
+ * Return: 0 if ICMP error not needed, length if built, negative value on error
+ */
+int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
+			  int headroom, bool reply)
+{
+	u32 mtu = dst_mtu(encap_dst) - headroom;
+
+	if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) ||
+	    (!skb_is_gso(skb) && (skb->len - skb_mac_header_len(skb)) <= mtu))
+		return 0;
+
+	skb_dst_update_pmtu_no_confirm(skb, mtu);
+
+	if (!reply || skb->pkt_type == PACKET_HOST)
+		return 0;
+
+	if (skb->protocol == htons(ETH_P_IP))
+		return iptunnel_pmtud_check_icmp(skb, mtu);
+
+#if IS_ENABLED(CONFIG_IPV6)
+	if (skb->protocol == htons(ETH_P_IPV6))
+		return iptunnel_pmtud_check_icmpv6(skb, mtu);
+#endif
+	return 0;
+}
+EXPORT_SYMBOL(skb_tunnel_check_pmtu);
+
 /* Often modified stats are per cpu, other are shared (netdev->stats) */
 void ip_tunnel_get_stats64(struct net_device *dev,
 			   struct rtnl_link_stats64 *tot)
 {
-	int i;
-
 	netdev_stats_to_stats64(tot, &dev->stats);
-
-	for_each_possible_cpu(i) {
-		const struct pcpu_sw_netstats *tstats =
-						   per_cpu_ptr(dev->tstats, i);
-		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
-		unsigned int start;
-
-		do {
-			start = u64_stats_fetch_begin_irq(&tstats->syncp);
-			rx_packets = tstats->rx_packets;
-			tx_packets = tstats->tx_packets;
-			rx_bytes = tstats->rx_bytes;
-			tx_bytes = tstats->tx_bytes;
-		} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
-
-		tot->rx_packets += rx_packets;
-		tot->tx_packets += tx_packets;
-		tot->rx_bytes   += rx_bytes;
-		tot->tx_bytes   += tx_bytes;
-	}
+	dev_fetch_sw_netstats(tot, dev->tstats);
 }
 EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
 
 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
+	[LWTUNNEL_IP_UNSPEC]	= { .strict_start_type = LWTUNNEL_IP_OPTS },
 	[LWTUNNEL_IP_ID]	= { .type = NLA_U64 },
 	[LWTUNNEL_IP_DST]	= { .type = NLA_U32 },
 	[LWTUNNEL_IP_SRC]	= { .type = NLA_U32 },
 	[LWTUNNEL_IP_TTL]	= { .type = NLA_U8 },
 	[LWTUNNEL_IP_TOS]	= { .type = NLA_U8 },
 	[LWTUNNEL_IP_FLAGS]	= { .type = NLA_U16 },
+	[LWTUNNEL_IP_OPTS]	= { .type = NLA_NESTED },
 };
 
-static int ip_tun_build_state(struct nlattr *attr,
+static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = {
+	[LWTUNNEL_IP_OPTS_GENEVE]	= { .type = NLA_NESTED },
+	[LWTUNNEL_IP_OPTS_VXLAN]	= { .type = NLA_NESTED },
+	[LWTUNNEL_IP_OPTS_ERSPAN]	= { .type = NLA_NESTED },
+};
+
+static const struct nla_policy
+geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = {
+	[LWTUNNEL_IP_OPT_GENEVE_CLASS]	= { .type = NLA_U16 },
+	[LWTUNNEL_IP_OPT_GENEVE_TYPE]	= { .type = NLA_U8 },
+	[LWTUNNEL_IP_OPT_GENEVE_DATA]	= { .type = NLA_BINARY, .len = 128 },
+};
+
+static const struct nla_policy
+vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = {
+	[LWTUNNEL_IP_OPT_VXLAN_GBP]	= { .type = NLA_U32 },
+};
+
+static const struct nla_policy
+erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = {
+	[LWTUNNEL_IP_OPT_ERSPAN_VER]	= { .type = NLA_U8 },
+	[LWTUNNEL_IP_OPT_ERSPAN_INDEX]	= { .type = NLA_U32 },
+	[LWTUNNEL_IP_OPT_ERSPAN_DIR]	= { .type = NLA_U8 },
+	[LWTUNNEL_IP_OPT_ERSPAN_HWID]	= { .type = NLA_U8 },
+};
+
+static int ip_tun_parse_opts_geneve(struct nlattr *attr,
+				    struct ip_tunnel_info *info, int opts_len,
+				    struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1];
+	int data_len, err;
+
+	err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr,
+			       geneve_opt_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] ||
+	    !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] ||
+	    !tb[LWTUNNEL_IP_OPT_GENEVE_DATA])
+		return -EINVAL;
+
+	attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
+	data_len = nla_len(attr);
+	if (data_len % 4)
+		return -EINVAL;
+
+	if (info) {
+		struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;
+
+		memcpy(opt->opt_data, nla_data(attr), data_len);
+		opt->length = data_len / 4;
+		attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS];
+		opt->opt_class = nla_get_be16(attr);
+		attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE];
+		opt->type = nla_get_u8(attr);
+		info->key.tun_flags |= TUNNEL_GENEVE_OPT;
+	}
+
+	return sizeof(struct geneve_opt) + data_len;
+}
+
+static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
+				   struct ip_tunnel_info *info, int opts_len,
+				   struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1];
+	int err;
+
+	err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr,
+			       vxlan_opt_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP])
+		return -EINVAL;
+
+	if (info) {
+		struct vxlan_metadata *md =
+			ip_tunnel_info_opts(info) + opts_len;
+
+		attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
+		md->gbp = nla_get_u32(attr);
+		md->gbp &= VXLAN_GBP_MASK;
+		info->key.tun_flags |= TUNNEL_VXLAN_OPT;
+	}
+
+	return sizeof(struct vxlan_metadata);
+}
+
+static int ip_tun_parse_opts_erspan(struct nlattr *attr,
+				    struct ip_tunnel_info *info, int opts_len,
+				    struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1];
+	int err;
+	u8 ver;
+
+	err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr,
+			       erspan_opt_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER])
+		return -EINVAL;
+
+	ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]);
+	if (ver == 1) {
+		if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX])
+			return -EINVAL;
+	} else if (ver == 2) {
+		if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] ||
+		    !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID])
+			return -EINVAL;
+	} else {
+		return -EINVAL;
+	}
+
+	if (info) {
+		struct erspan_metadata *md =
+			ip_tunnel_info_opts(info) + opts_len;
+
+		md->version = ver;
+		if (ver == 1) {
+			attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX];
+			md->u.index = nla_get_be32(attr);
+		} else {
+			attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR];
+			md->u.md2.dir = nla_get_u8(attr);
+			attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID];
+			set_hwid(&md->u.md2, nla_get_u8(attr));
+		}
+
+		info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
+	}
+
+	return sizeof(struct erspan_metadata);
+}
+
+static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
+			     struct netlink_ext_ack *extack)
+{
+	int err, rem, opt_len, opts_len = 0, type = 0;
+	struct nlattr *nla;
+
+	if (!attr)
+		return 0;
+
+	err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX,
+			   ip_opts_policy, extack);
+	if (err)
+		return err;
+
+	nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
+		switch (nla_type(nla)) {
+		case LWTUNNEL_IP_OPTS_GENEVE:
+			if (type && type != TUNNEL_GENEVE_OPT)
+				return -EINVAL;
+			opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len,
+							   extack);
+			if (opt_len < 0)
+				return opt_len;
+			opts_len += opt_len;
+			if (opts_len > IP_TUNNEL_OPTS_MAX)
+				return -EINVAL;
+			type = TUNNEL_GENEVE_OPT;
+			break;
+		case LWTUNNEL_IP_OPTS_VXLAN:
+			if (type)
+				return -EINVAL;
+			opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len,
+							  extack);
+			if (opt_len < 0)
+				return opt_len;
+			opts_len += opt_len;
+			type = TUNNEL_VXLAN_OPT;
+			break;
+		case LWTUNNEL_IP_OPTS_ERSPAN:
+			if (type)
+				return -EINVAL;
+			opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len,
+							   extack);
+			if (opt_len < 0)
+				return opt_len;
+			opts_len += opt_len;
+			type = TUNNEL_ERSPAN_OPT;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return opts_len;
+}
+
+static int ip_tun_get_optlen(struct nlattr *attr,
+			     struct netlink_ext_ack *extack)
+{
+	return ip_tun_parse_opts(attr, NULL, extack);
+}
+
+static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
+			   struct netlink_ext_ack *extack)
+{
+	return ip_tun_parse_opts(attr, info, extack);
+}
+
+static int ip_tun_build_state(struct net *net, struct nlattr *attr,
 			      unsigned int family, const void *cfg,
 			      struct lwtunnel_state **ts,
 			      struct netlink_ext_ack *extack)
 {
-	struct ip_tunnel_info *tun_info;
-	struct lwtunnel_state *new_state;
 	struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
-	int err;
+	struct lwtunnel_state *new_state;
+	struct ip_tunnel_info *tun_info;
+	int err, opt_len;
 
 	err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
 					  ip_tun_policy, extack);
 	if (err < 0)
 		return err;
 
-	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
+	opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
+	if (opt_len < 0)
+		return opt_len;
+
+	new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
 	if (!new_state)
 		return -ENOMEM;
 
@@ -242,6 +684,12 @@
 
 	tun_info = lwt_tun_info(new_state);
 
+	err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
+	if (err < 0) {
+		lwtstate_free(new_state);
+		return err;
+	}
+
 #ifdef CONFIG_DST_CACHE
 	err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
 	if (err) {
@@ -266,10 +714,12 @@
 		tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
 
 	if (tb[LWTUNNEL_IP_FLAGS])
-		tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]);
+		tun_info->key.tun_flags |=
+				(nla_get_be16(tb[LWTUNNEL_IP_FLAGS]) &
+				 ~TUNNEL_OPTIONS_PRESENT);
 
 	tun_info->mode = IP_TUNNEL_INFO_TX;
-	tun_info->options_len = 0;
+	tun_info->options_len = opt_len;
 
 	*ts = new_state;
 
@@ -285,6 +735,114 @@
 #endif
 }
 
+static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
+					 struct ip_tunnel_info *tun_info)
+{
+	struct geneve_opt *opt;
+	struct nlattr *nest;
+	int offset = 0;
+
+	nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
+	if (!nest)
+		return -ENOMEM;
+
+	while (tun_info->options_len > offset) {
+		opt = ip_tunnel_info_opts(tun_info) + offset;
+		if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS,
+				 opt->opt_class) ||
+		    nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
+		    nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
+			    opt->opt_data)) {
+			nla_nest_cancel(skb, nest);
+			return -ENOMEM;
+		}
+		offset += sizeof(*opt) + opt->length * 4;
+	}
+
+	nla_nest_end(skb, nest);
+	return 0;
+}
+
+static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
+					struct ip_tunnel_info *tun_info)
+{
+	struct vxlan_metadata *md;
+	struct nlattr *nest;
+
+	nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
+	if (!nest)
+		return -ENOMEM;
+
+	md = ip_tunnel_info_opts(tun_info);
+	if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
+		nla_nest_cancel(skb, nest);
+		return -ENOMEM;
+	}
+
+	nla_nest_end(skb, nest);
+	return 0;
+}
+
+static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb,
+					 struct ip_tunnel_info *tun_info)
+{
+	struct erspan_metadata *md;
+	struct nlattr *nest;
+
+	nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN);
+	if (!nest)
+		return -ENOMEM;
+
+	md = ip_tunnel_info_opts(tun_info);
+	if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version))
+		goto err;
+
+	if (md->version == 1 &&
+	    nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index))
+		goto err;
+
+	if (md->version == 2 &&
+	    (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) ||
+	     nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID,
+			get_hwid(&md->u.md2))))
+		goto err;
+
+	nla_nest_end(skb, nest);
+	return 0;
+err:
+	nla_nest_cancel(skb, nest);
+	return -ENOMEM;
+}
+
+static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
+				  struct ip_tunnel_info *tun_info)
+{
+	struct nlattr *nest;
+	int err = 0;
+
+	if (!(tun_info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
+		return 0;
+
+	nest = nla_nest_start_noflag(skb, type);
+	if (!nest)
+		return -ENOMEM;
+
+	if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT)
+		err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
+	else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT)
+		err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
+	else if (tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)
+		err = ip_tun_fill_encap_opts_erspan(skb, tun_info);
+
+	if (err) {
+		nla_nest_cancel(skb, nest);
+		return err;
+	}
+
+	nla_nest_end(skb, nest);
+	return 0;
+}
+
 static int ip_tun_fill_encap_info(struct sk_buff *skb,
 				  struct lwtunnel_state *lwtstate)
 {
@@ -296,12 +854,52 @@
 	    nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
 	    nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
 	    nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
-	    nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags))
+	    nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) ||
+	    ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
 		return -ENOMEM;
 
 	return 0;
 }
 
+static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
+{
+	int opt_len;
+
+	if (!(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
+		return 0;
+
+	opt_len = nla_total_size(0);		/* LWTUNNEL_IP_OPTS */
+	if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
+		struct geneve_opt *opt;
+		int offset = 0;
+
+		opt_len += nla_total_size(0);	/* LWTUNNEL_IP_OPTS_GENEVE */
+		while (info->options_len > offset) {
+			opt = ip_tunnel_info_opts(info) + offset;
+			opt_len += nla_total_size(2)	/* OPT_GENEVE_CLASS */
+				   + nla_total_size(1)	/* OPT_GENEVE_TYPE */
+				   + nla_total_size(opt->length * 4);
+							/* OPT_GENEVE_DATA */
+			offset += sizeof(*opt) + opt->length * 4;
+		}
+	} else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
+		opt_len += nla_total_size(0)	/* LWTUNNEL_IP_OPTS_VXLAN */
+			   + nla_total_size(4);	/* OPT_VXLAN_GBP */
+	} else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
+		struct erspan_metadata *md = ip_tunnel_info_opts(info);
+
+		opt_len += nla_total_size(0)	/* LWTUNNEL_IP_OPTS_ERSPAN */
+			   + nla_total_size(1)	/* OPT_ERSPAN_VER */
+			   + (md->version == 1 ? nla_total_size(4)
+						/* OPT_ERSPAN_INDEX (v1) */
+					       : nla_total_size(1) +
+						 nla_total_size(1));
+						/* OPT_ERSPAN_DIR + HWID (v2) */
+	}
+
+	return opt_len;
+}
+
 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
 {
 	return nla_total_size_64bit(8)	/* LWTUNNEL_IP_ID */
@@ -309,13 +907,21 @@
 		+ nla_total_size(4)	/* LWTUNNEL_IP_SRC */
 		+ nla_total_size(1)	/* LWTUNNEL_IP_TOS */
 		+ nla_total_size(1)	/* LWTUNNEL_IP_TTL */
-		+ nla_total_size(2);	/* LWTUNNEL_IP_FLAGS */
+		+ nla_total_size(2)	/* LWTUNNEL_IP_FLAGS */
+		+ ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
+					/* LWTUNNEL_IP_OPTS */
 }
 
 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
 {
-	return memcmp(lwt_tun_info(a), lwt_tun_info(b),
-		      sizeof(struct ip_tunnel_info));
+	struct ip_tunnel_info *info_a = lwt_tun_info(a);
+	struct ip_tunnel_info *info_b = lwt_tun_info(b);
+
+	return memcmp(info_a, info_b, sizeof(info_a->key)) ||
+	       info_a->mode != info_b->mode ||
+	       info_a->options_len != info_b->options_len ||
+	       memcmp(ip_tunnel_info_opts(info_a),
+		      ip_tunnel_info_opts(info_b), info_a->options_len);
 }
 
 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
@@ -328,30 +934,36 @@
 };
 
 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
+	[LWTUNNEL_IP6_UNSPEC]	= { .strict_start_type = LWTUNNEL_IP6_OPTS },
 	[LWTUNNEL_IP6_ID]		= { .type = NLA_U64 },
 	[LWTUNNEL_IP6_DST]		= { .len = sizeof(struct in6_addr) },
 	[LWTUNNEL_IP6_SRC]		= { .len = sizeof(struct in6_addr) },
 	[LWTUNNEL_IP6_HOPLIMIT]		= { .type = NLA_U8 },
 	[LWTUNNEL_IP6_TC]		= { .type = NLA_U8 },
 	[LWTUNNEL_IP6_FLAGS]		= { .type = NLA_U16 },
+	[LWTUNNEL_IP6_OPTS]		= { .type = NLA_NESTED },
 };
 
-static int ip6_tun_build_state(struct nlattr *attr,
+static int ip6_tun_build_state(struct net *net, struct nlattr *attr,
 			       unsigned int family, const void *cfg,
 			       struct lwtunnel_state **ts,
 			       struct netlink_ext_ack *extack)
 {
-	struct ip_tunnel_info *tun_info;
-	struct lwtunnel_state *new_state;
 	struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
-	int err;
+	struct lwtunnel_state *new_state;
+	struct ip_tunnel_info *tun_info;
+	int err, opt_len;
 
 	err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
 					  ip6_tun_policy, extack);
 	if (err < 0)
 		return err;
 
-	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
+	opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
+	if (opt_len < 0)
+		return opt_len;
+
+	new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
 	if (!new_state)
 		return -ENOMEM;
 
@@ -359,6 +971,12 @@
 
 	tun_info = lwt_tun_info(new_state);
 
+	err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
+	if (err < 0) {
+		lwtstate_free(new_state);
+		return err;
+	}
+
 	if (tb[LWTUNNEL_IP6_ID])
 		tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
 
@@ -375,10 +993,12 @@
 		tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
 
 	if (tb[LWTUNNEL_IP6_FLAGS])
-		tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
+		tun_info->key.tun_flags |=
+				(nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]) &
+				 ~TUNNEL_OPTIONS_PRESENT);
 
 	tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
-	tun_info->options_len = 0;
+	tun_info->options_len = opt_len;
 
 	*ts = new_state;
 
@@ -396,7 +1016,8 @@
 	    nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
 	    nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
 	    nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
-	    nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
+	    nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) ||
+	    ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
 		return -ENOMEM;
 
 	return 0;
@@ -409,7 +1030,9 @@
 		+ nla_total_size(16)	/* LWTUNNEL_IP6_SRC */
 		+ nla_total_size(1)	/* LWTUNNEL_IP6_HOPLIMIT */
 		+ nla_total_size(1)	/* LWTUNNEL_IP6_TC */
-		+ nla_total_size(2);	/* LWTUNNEL_IP6_FLAGS */
+		+ nla_total_size(2)	/* LWTUNNEL_IP6_FLAGS */
+		+ ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
+					/* LWTUNNEL_IP6_OPTS */
 }
 
 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
@@ -446,3 +1069,21 @@
 	static_branch_dec(&ip_tunnel_metadata_cnt);
 }
 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
+
+/* Returns either the correct skb->protocol value, or 0 if invalid. */
+__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb)
+{
+	if (skb_network_header(skb) >= skb->head &&
+	    (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) &&
+	    ip_hdr(skb)->version == 4)
+		return htons(ETH_P_IP);
+	if (skb_network_header(skb) >= skb->head &&
+	    (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) &&
+	    ipv6_hdr(skb)->version == 6)
+		return htons(ETH_P_IPV6);
+	return 0;
+}
+EXPORT_SYMBOL(ip_tunnel_parse_protocol);
+
+const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
+EXPORT_SYMBOL(ip_tunnel_header_ops);
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index bd41354..84a818b 100644
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -91,37 +91,10 @@
 	return vti_rcv(skb, 0, false);
 }
 
-static int vti_rcv_tunnel(struct sk_buff *skb)
-{
-	struct ip_tunnel_net *itn = net_generic(dev_net(skb->dev), vti_net_id);
-	const struct iphdr *iph = ip_hdr(skb);
-	struct ip_tunnel *tunnel;
-
-	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
-				  iph->saddr, iph->daddr, 0);
-	if (tunnel) {
-		struct tnl_ptk_info tpi = {
-			.proto = htons(ETH_P_IP),
-		};
-
-		if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
-			goto drop;
-		if (iptunnel_pull_header(skb, 0, tpi.proto, false))
-			goto drop;
-		return ip_tunnel_rcv(tunnel, skb, &tpi, NULL, false);
-	}
-
-	return -EINVAL;
-drop:
-	kfree_skb(skb);
-	return 0;
-}
-
 static int vti_rcv_cb(struct sk_buff *skb, int err)
 {
 	unsigned short family;
 	struct net_device *dev;
-	struct pcpu_sw_netstats *tstats;
 	struct xfrm_state *x;
 	const struct xfrm_mode *inner_mode;
 	struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
@@ -164,13 +137,7 @@
 
 	skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
 	skb->dev = dev;
-
-	tstats = this_cpu_ptr(dev->tstats);
-
-	u64_stats_update_begin(&tstats->syncp);
-	tstats->rx_packets++;
-	tstats->rx_bytes += skb->len;
-	u64_stats_update_end(&tstats->syncp);
+	dev_sw_netstats_rx_add(dev, skb->len);
 
 	return 0;
 }
@@ -244,12 +211,15 @@
 	}
 
 	dst_hold(dst);
-	dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
+	dst = xfrm_lookup_route(tunnel->net, dst, fl, NULL, 0);
 	if (IS_ERR(dst)) {
 		dev->stats.tx_carrier_errors++;
 		goto tx_error_icmp;
 	}
 
+	if (dst->flags & DST_XFRM_QUEUE)
+		goto queued;
+
 	if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
 		dev->stats.tx_carrier_errors++;
 		dst_release(dst);
@@ -268,19 +238,20 @@
 	if (skb->len > mtu) {
 		skb_dst_update_pmtu_no_confirm(skb, mtu);
 		if (skb->protocol == htons(ETH_P_IP)) {
-			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
-				  htonl(mtu));
+			icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+				      htonl(mtu));
 		} else {
 			if (mtu < IPV6_MIN_MTU)
 				mtu = IPV6_MIN_MTU;
 
-			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+			icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 		}
 
 		dst_release(dst);
 		goto tx_error;
 	}
 
+queued:
 	skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
 	skb_dst_set(skb, dst);
 	skb->dev = skb_dst(skb)->dev;
@@ -399,38 +370,31 @@
 }
 
 static int
-vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
 {
 	int err = 0;
-	struct ip_tunnel_parm p;
-
-	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
-		return -EFAULT;
 
 	if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
-		if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
-		    p.iph.ihl != 5)
+		if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP ||
+		    p->iph.ihl != 5)
 			return -EINVAL;
 	}
 
-	if (!(p.i_flags & GRE_KEY))
-		p.i_key = 0;
-	if (!(p.o_flags & GRE_KEY))
-		p.o_key = 0;
+	if (!(p->i_flags & GRE_KEY))
+		p->i_key = 0;
+	if (!(p->o_flags & GRE_KEY))
+		p->o_key = 0;
 
-	p.i_flags = VTI_ISVTI;
+	p->i_flags = VTI_ISVTI;
 
-	err = ip_tunnel_ioctl(dev, &p, cmd);
+	err = ip_tunnel_ctl(dev, p, cmd);
 	if (err)
 		return err;
 
 	if (cmd != SIOCDELTUNNEL) {
-		p.i_flags |= GRE_KEY;
-		p.o_flags |= GRE_KEY;
+		p->i_flags |= GRE_KEY;
+		p->o_flags |= GRE_KEY;
 	}
-
-	if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
-		return -EFAULT;
 	return 0;
 }
 
@@ -438,15 +402,17 @@
 	.ndo_init	= vti_tunnel_init,
 	.ndo_uninit	= ip_tunnel_uninit,
 	.ndo_start_xmit	= vti_tunnel_xmit,
-	.ndo_do_ioctl	= vti_tunnel_ioctl,
+	.ndo_do_ioctl	= ip_tunnel_ioctl,
 	.ndo_change_mtu	= ip_tunnel_change_mtu,
 	.ndo_get_stats64 = ip_tunnel_get_stats64,
 	.ndo_get_iflink = ip_tunnel_get_iflink,
+	.ndo_tunnel_ctl	= vti_tunnel_ctl,
 };
 
 static void vti_tunnel_setup(struct net_device *dev)
 {
 	dev->netdev_ops		= &vti_netdev_ops;
+	dev->header_ops		= &ip_tunnel_header_ops;
 	dev->type		= ARPHRD_TUNNEL;
 	ip_tunnel_setup(dev, vti_net_id);
 }
@@ -501,12 +467,32 @@
 	.priority	=	100,
 };
 
-static struct xfrm_tunnel ipip_handler __read_mostly = {
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
+static int vti_rcv_tunnel(struct sk_buff *skb)
+{
+	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
+	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
+
+	return vti_input(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr, 0, false);
+}
+
+static struct xfrm_tunnel vti_ipip_handler __read_mostly = {
 	.handler	=	vti_rcv_tunnel,
+	.cb_handler	=	vti_rcv_cb,
 	.err_handler	=	vti4_err,
 	.priority	=	0,
 };
 
+#if IS_ENABLED(CONFIG_IPV6)
+static struct xfrm_tunnel vti_ipip6_handler __read_mostly = {
+	.handler	=	vti_rcv_tunnel,
+	.cb_handler	=	vti_rcv_cb,
+	.err_handler	=	vti4_err,
+	.priority	=	0,
+};
+#endif
+#endif
+
 static int __net_init vti_init_net(struct net *net)
 {
 	int err;
@@ -632,8 +618,8 @@
 	[IFLA_VTI_LINK]		= { .type = NLA_U32 },
 	[IFLA_VTI_IKEY]		= { .type = NLA_U32 },
 	[IFLA_VTI_OKEY]		= { .type = NLA_U32 },
-	[IFLA_VTI_LOCAL]	= { .len = FIELD_SIZEOF(struct iphdr, saddr) },
-	[IFLA_VTI_REMOTE]	= { .len = FIELD_SIZEOF(struct iphdr, daddr) },
+	[IFLA_VTI_LOCAL]	= { .len = sizeof_field(struct iphdr, saddr) },
+	[IFLA_VTI_REMOTE]	= { .len = sizeof_field(struct iphdr, daddr) },
 	[IFLA_VTI_FWMARK]	= { .type = NLA_U32 },
 };
 
@@ -675,10 +661,17 @@
 	if (err < 0)
 		goto xfrm_proto_comp_failed;
 
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
 	msg = "ipip tunnel";
-	err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
+	err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET);
 	if (err < 0)
-		goto xfrm_tunnel_failed;
+		goto xfrm_tunnel_ipip_failed;
+#if IS_ENABLED(CONFIG_IPV6)
+	err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6);
+	if (err < 0)
+		goto xfrm_tunnel_ipip6_failed;
+#endif
+#endif
 
 	msg = "netlink interface";
 	err = rtnl_link_register(&vti_link_ops);
@@ -688,8 +681,14 @@
 	return err;
 
 rtnl_link_failed:
-	xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
-xfrm_tunnel_failed:
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
+#if IS_ENABLED(CONFIG_IPV6)
+	xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
+xfrm_tunnel_ipip6_failed:
+#endif
+	xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
+xfrm_tunnel_ipip_failed:
+#endif
 	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
 xfrm_proto_comp_failed:
 	xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
@@ -705,7 +704,12 @@
 static void __exit vti_fini(void)
 {
 	rtnl_link_unregister(&vti_link_ops);
-	xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
+#if IS_ENABLED(CONFIG_IPV6)
+	xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
+#endif
+	xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
+#endif
 	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
 	xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
 	xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index 59bfa38..b426832 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -72,6 +72,7 @@
 	t->props.flags = x->props.flags;
 	t->props.extra_flags = x->props.extra_flags;
 	memcpy(&t->mark, &x->mark, sizeof(t->mark));
+	t->if_id = x->if_id;
 
 	if (xfrm_init_state(t))
 		goto error;
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index c05ad60..213a1c9 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -1337,7 +1337,7 @@
 
 /* Create a new file under /proc/net/ipconfig */
 static int ipconfig_proc_net_create(const char *name,
-				    const struct file_operations *fops)
+				    const struct proc_ops *proc_ops)
 {
 	char *pname;
 	struct proc_dir_entry *p;
@@ -1349,7 +1349,7 @@
 	if (!pname)
 		return -ENOMEM;
 
-	p = proc_create(pname, 0444, init_net.proc_net, fops);
+	p = proc_create(pname, 0444, init_net.proc_net, proc_ops);
 	kfree(pname);
 	if (!p)
 		return -ENOMEM;
@@ -1358,7 +1358,7 @@
 }
 
 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */
-static int ntp_servers_seq_show(struct seq_file *seq, void *v)
+static int ntp_servers_show(struct seq_file *seq, void *v)
 {
 	int i;
 
@@ -1368,7 +1368,7 @@
 	}
 	return 0;
 }
-DEFINE_SHOW_ATTRIBUTE(ntp_servers_seq);
+DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers);
 #endif /* CONFIG_PROC_FS */
 
 /*
@@ -1415,6 +1415,9 @@
 		struct net_device *dev;
 		int found = 0;
 
+		/* make sure deferred device probes are finished */
+		wait_for_device_probe();
+
 		rtnl_lock();
 		for_each_netdev(&init_net, dev) {
 			if (ic_is_init_dev(dev)) {
@@ -1441,7 +1444,7 @@
 	int retries = CONF_OPEN_RETRIES;
 #endif
 	int err;
-	unsigned int i;
+	unsigned int i, count;
 
 	/* Initialise all name servers and NTP servers to NONE (but only if the
 	 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded,
@@ -1456,7 +1459,7 @@
 	proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show);
 
 	if (ipconfig_proc_net_init() == 0)
-		ipconfig_proc_net_create("ntp_servers", &ntp_servers_seq_fops);
+		ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops);
 #endif /* CONFIG_PROC_FS */
 
 	if (!ic_enable)
@@ -1486,10 +1489,10 @@
 	 * missing values.
 	 */
 	if (ic_myaddr == NONE ||
-#ifdef CONFIG_ROOT_NFS
+#if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT)
 	    (root_server_addr == NONE &&
 	     ic_servaddr == NONE &&
-	     ROOT_DEV == Root_NFS) ||
+	     (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) ||
 #endif
 	    ic_first_dev->next) {
 #ifdef IPCONFIG_DYNAMIC
@@ -1516,6 +1519,12 @@
 				goto try_try_again;
 			}
 #endif
+#ifdef CONFIG_CIFS_ROOT
+			if (ROOT_DEV == Root_CIFS) {
+				pr_err("IP-Config: Retrying forever (CIFS root)...\n");
+				goto try_try_again;
+			}
+#endif
 
 			if (--retries) {
 				pr_err("IP-Config: Reopening network devices...\n");
@@ -1569,7 +1578,7 @@
 	if (ic_dev_mtu)
 		pr_cont(", mtu=%d", ic_dev_mtu);
 	/* Name servers (if any): */
-	for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
+	for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) {
 		if (ic_nameservers[i] != NONE) {
 			if (i == 0)
 				pr_info("     nameserver%u=%pI4",
@@ -1577,12 +1586,14 @@
 			else
 				pr_cont(", nameserver%u=%pI4",
 					i, &ic_nameservers[i]);
+
+			count++;
 		}
-		if (i + 1 == CONF_NAMESERVERS_MAX)
+		if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0)
 			pr_cont("\n");
 	}
 	/* NTP servers (if any): */
-	for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) {
+	for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) {
 		if (ic_ntp_servers[i] != NONE) {
 			if (i == 0)
 				pr_info("     ntpserver%u=%pI4",
@@ -1590,8 +1601,10 @@
 			else
 				pr_cont(", ntpserver%u=%pI4",
 					i, &ic_ntp_servers[i]);
+
+			count++;
 		}
-		if (i + 1 == CONF_NTP_SERVERS_MAX)
+		if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0)
 			pr_cont("\n");
 	}
 #endif /* !SILENT */
@@ -1615,7 +1628,7 @@
 
 /*
  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
- *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
+ *  command line parameter.  See Documentation/admin-guide/nfs/nfsroot.rst.
  */
 static int __init ic_proto_name(char *name)
 {
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 678575a..75d35e7 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -327,41 +327,29 @@
 }
 
 static int
-ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
 {
-	int err = 0;
-	struct ip_tunnel_parm p;
-
-	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
-		return -EFAULT;
-
 	if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
-		if (p.iph.version != 4 ||
-		    !ipip_tunnel_ioctl_verify_protocol(p.iph.protocol) ||
-		    p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
+		if (p->iph.version != 4 ||
+		    !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) ||
+		    p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))
 			return -EINVAL;
 	}
 
-	p.i_key = p.o_key = 0;
-	p.i_flags = p.o_flags = 0;
-	err = ip_tunnel_ioctl(dev, &p, cmd);
-	if (err)
-		return err;
-
-	if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
-		return -EFAULT;
-
-	return 0;
+	p->i_key = p->o_key = 0;
+	p->i_flags = p->o_flags = 0;
+	return ip_tunnel_ctl(dev, p, cmd);
 }
 
 static const struct net_device_ops ipip_netdev_ops = {
 	.ndo_init       = ipip_tunnel_init,
 	.ndo_uninit     = ip_tunnel_uninit,
 	.ndo_start_xmit	= ipip_tunnel_xmit,
-	.ndo_do_ioctl	= ipip_tunnel_ioctl,
+	.ndo_do_ioctl	= ip_tunnel_ioctl,
 	.ndo_change_mtu = ip_tunnel_change_mtu,
 	.ndo_get_stats64 = ip_tunnel_get_stats64,
 	.ndo_get_iflink = ip_tunnel_get_iflink,
+	.ndo_tunnel_ctl	= ipip_tunnel_ctl,
 };
 
 #define IPIP_FEATURES (NETIF_F_SG |		\
@@ -373,6 +361,7 @@
 static void ipip_tunnel_setup(struct net_device *dev)
 {
 	dev->netdev_ops		= &ipip_netdev_ops;
+	dev->header_ops		= &ip_tunnel_header_ops;
 
 	dev->type		= ARPHRD_TUNNEL;
 	dev->flags		= IFF_NOARP;
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index d719356..be19765 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -109,8 +109,10 @@
 static void ipmr_expire_process(struct timer_list *t);
 
 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
-#define ipmr_for_each_table(mrt, net) \
-	list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)
+#define ipmr_for_each_table(mrt, net)					\
+	list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list,	\
+				lockdep_rtnl_is_held() ||		\
+				list_empty(&net->ipv4.mr_tables))
 
 static struct mr_table *ipmr_mr_table_iter(struct net *net,
 					   struct mr_table *mrt)
@@ -259,7 +261,9 @@
 	return 0;
 
 err2:
+	rtnl_lock();
 	ipmr_free_table(mrt);
+	rtnl_unlock();
 err1:
 	fib_rules_unregister(ops);
 	return err;
@@ -278,9 +282,10 @@
 	rtnl_unlock();
 }
 
-static int ipmr_rules_dump(struct net *net, struct notifier_block *nb)
+static int ipmr_rules_dump(struct net *net, struct notifier_block *nb,
+			   struct netlink_ext_ack *extack)
 {
-	return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR);
+	return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR, extack);
 }
 
 static unsigned int ipmr_rules_seq_read(struct net *net)
@@ -336,7 +341,8 @@
 	rtnl_unlock();
 }
 
-static int ipmr_rules_dump(struct net *net, struct notifier_block *nb)
+static int ipmr_rules_dump(struct net *net, struct notifier_block *nb,
+			   struct netlink_ext_ack *extack)
 {
 	return 0;
 }
@@ -417,37 +423,6 @@
 
 /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
 
-static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
-{
-	struct net *net = dev_net(dev);
-
-	dev_close(dev);
-
-	dev = __dev_get_by_name(net, "tunl0");
-	if (dev) {
-		const struct net_device_ops *ops = dev->netdev_ops;
-		struct ifreq ifr;
-		struct ip_tunnel_parm p;
-
-		memset(&p, 0, sizeof(p));
-		p.iph.daddr = v->vifc_rmt_addr.s_addr;
-		p.iph.saddr = v->vifc_lcl_addr.s_addr;
-		p.iph.version = 4;
-		p.iph.ihl = 5;
-		p.iph.protocol = IPPROTO_IPIP;
-		sprintf(p.name, "dvmrp%d", v->vifc_vifi);
-		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
-
-		if (ops->ndo_do_ioctl) {
-			mm_segment_t oldfs = get_fs();
-
-			set_fs(KERNEL_DS);
-			ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
-			set_fs(oldfs);
-		}
-	}
-}
-
 /* Initialize ipmr pimreg/tunnel in_device */
 static bool ipmr_init_vif_indev(const struct net_device *dev)
 {
@@ -467,51 +442,52 @@
 
 static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
 {
-	struct net_device  *dev;
+	struct net_device *tunnel_dev, *new_dev;
+	struct ip_tunnel_parm p = { };
+	int err;
 
-	dev = __dev_get_by_name(net, "tunl0");
+	tunnel_dev = __dev_get_by_name(net, "tunl0");
+	if (!tunnel_dev)
+		goto out;
 
-	if (dev) {
-		const struct net_device_ops *ops = dev->netdev_ops;
-		int err;
-		struct ifreq ifr;
-		struct ip_tunnel_parm p;
+	p.iph.daddr = v->vifc_rmt_addr.s_addr;
+	p.iph.saddr = v->vifc_lcl_addr.s_addr;
+	p.iph.version = 4;
+	p.iph.ihl = 5;
+	p.iph.protocol = IPPROTO_IPIP;
+	sprintf(p.name, "dvmrp%d", v->vifc_vifi);
 
-		memset(&p, 0, sizeof(p));
-		p.iph.daddr = v->vifc_rmt_addr.s_addr;
-		p.iph.saddr = v->vifc_lcl_addr.s_addr;
-		p.iph.version = 4;
-		p.iph.ihl = 5;
-		p.iph.protocol = IPPROTO_IPIP;
-		sprintf(p.name, "dvmrp%d", v->vifc_vifi);
-		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
+	if (!tunnel_dev->netdev_ops->ndo_tunnel_ctl)
+		goto out;
+	err = tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p,
+			SIOCADDTUNNEL);
+	if (err)
+		goto out;
 
-		if (ops->ndo_do_ioctl) {
-			mm_segment_t oldfs = get_fs();
+	new_dev = __dev_get_by_name(net, p.name);
+	if (!new_dev)
+		goto out;
 
-			set_fs(KERNEL_DS);
-			err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
-			set_fs(oldfs);
-		} else {
-			err = -EOPNOTSUPP;
-		}
-		dev = NULL;
-
-		if (err == 0 &&
-		    (dev = __dev_get_by_name(net, p.name)) != NULL) {
-			dev->flags |= IFF_MULTICAST;
-			if (!ipmr_init_vif_indev(dev))
-				goto failure;
-			if (dev_open(dev, NULL))
-				goto failure;
-			dev_hold(dev);
-		}
+	new_dev->flags |= IFF_MULTICAST;
+	if (!ipmr_init_vif_indev(new_dev))
+		goto out_unregister;
+	if (dev_open(new_dev, NULL))
+		goto out_unregister;
+	dev_hold(new_dev);
+	err = dev_set_allmulti(new_dev, 1);
+	if (err) {
+		dev_close(new_dev);
+		tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p,
+				SIOCDELTUNNEL);
+		dev_put(new_dev);
+		new_dev = ERR_PTR(err);
 	}
-	return dev;
+	return new_dev;
 
-failure:
-	unregister_netdevice(dev);
-	return NULL;
+out_unregister:
+	unregister_netdevice(new_dev);
+out:
+	return ERR_PTR(-ENOBUFS);
 }
 
 #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
@@ -662,7 +638,10 @@
 
 /**
  *	vif_delete - Delete a VIF entry
+ *	@mrt: Table to delete from
+ *	@vifi: VIF identifier to delete
  *	@notify: Set to 1, if the caller is a notifier_call
+ *	@head: if unregistering the VIF, place it on this queue
  */
 static int vif_delete(struct mr_table *mrt, int vifi, int notify,
 		      struct list_head *head)
@@ -863,14 +842,8 @@
 		break;
 	case VIFF_TUNNEL:
 		dev = ipmr_new_tunnel(net, vifc);
-		if (!dev)
-			return -ENOBUFS;
-		err = dev_set_allmulti(dev, 1);
-		if (err) {
-			ipmr_del_tunnel(dev, vifc);
-			dev_put(dev);
-			return err;
-		}
+		if (IS_ERR(dev))
+			return PTR_ERR(dev);
 		break;
 	case VIFF_USE_IFINDEX:
 	case 0:
@@ -1067,10 +1040,13 @@
 		memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
 		msg->im_msgtype = assert;
 		msg->im_mbz = 0;
-		if (assert == IGMPMSG_WRVIFWHOLE)
+		if (assert == IGMPMSG_WRVIFWHOLE) {
 			msg->im_vif = vifi;
-		else
+			msg->im_vif_hi = vifi >> 8;
+		} else {
 			msg->im_vif = mrt->mroute_reg_vif_num;
+			msg->im_vif_hi = mrt->mroute_reg_vif_num >> 8;
+		}
 		ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
 		ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
 					     sizeof(struct iphdr));
@@ -1083,6 +1059,7 @@
 		ip_hdr(skb)->protocol = 0;
 		msg = (struct igmpmsg *)skb_network_header(skb);
 		msg->im_vif = vifi;
+		msg->im_vif_hi = vifi >> 8;
 		skb_dst_set(skb, dst_clone(skb_dst(pkt)));
 		/* Add our header */
 		igmp = skb_put(skb, sizeof(struct igmphdr));
@@ -1370,7 +1347,7 @@
  * MOSPF/PIM router set up we can clean this up.
  */
 
-int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
+int ip_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 			 unsigned int optlen)
 {
 	struct net *net = sock_net(sk);
@@ -1442,7 +1419,7 @@
 			ret = -EINVAL;
 			break;
 		}
-		if (copy_from_user(&vif, optval, sizeof(vif))) {
+		if (copy_from_sockptr(&vif, optval, sizeof(vif))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1463,14 +1440,14 @@
 	case MRT_ADD_MFC:
 	case MRT_DEL_MFC:
 		parent = -1;
-		/* fall through */
+		fallthrough;
 	case MRT_ADD_MFC_PROXY:
 	case MRT_DEL_MFC_PROXY:
 		if (optlen != sizeof(mfc)) {
 			ret = -EINVAL;
 			break;
 		}
-		if (copy_from_user(&mfc, optval, sizeof(mfc))) {
+		if (copy_from_sockptr(&mfc, optval, sizeof(mfc))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1488,7 +1465,7 @@
 			ret = -EINVAL;
 			break;
 		}
-		if (get_user(val, (int __user *)optval)) {
+		if (copy_from_sockptr(&val, optval, sizeof(val))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1500,7 +1477,7 @@
 			ret = -EINVAL;
 			break;
 		}
-		if (get_user(val, (int __user *)optval)) {
+		if (copy_from_sockptr(&val, optval, sizeof(val))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1515,7 +1492,7 @@
 			ret = -EINVAL;
 			break;
 		}
-		if (get_user(val, (int __user *)optval)) {
+		if (copy_from_sockptr(&val, optval, sizeof(val))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1537,7 +1514,7 @@
 			ret = -EINVAL;
 			break;
 		}
-		if (get_user(uval, (u32 __user *)optval)) {
+		if (copy_from_sockptr(&uval, optval, sizeof(uval))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -2425,6 +2402,7 @@
 		+ nla_total_size(4)	/* IPMRA_CREPORT_VIF_ID */
 		+ nla_total_size(4)	/* IPMRA_CREPORT_SRC_ADDR */
 		+ nla_total_size(4)	/* IPMRA_CREPORT_DST_ADDR */
+		+ nla_total_size(4)	/* IPMRA_CREPORT_TABLE */
 					/* IPMRA_CREPORT_PKT */
 		+ nla_total_size(payloadlen)
 		;
@@ -2456,11 +2434,12 @@
 	rtgenm = nlmsg_data(nlh);
 	rtgenm->rtgen_family = RTNL_FAMILY_IPMR;
 	if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) ||
-	    nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif) ||
+	    nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif | (msg->im_vif_hi << 8)) ||
 	    nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR,
 			    msg->im_src.s_addr) ||
 	    nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR,
-			    msg->im_dst.s_addr))
+			    msg->im_dst.s_addr) ||
+	    nla_put_u32(skb, IPMRA_CREPORT_TABLE, mrt->id))
 		goto nla_put_failure;
 
 	nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen);
@@ -3041,10 +3020,11 @@
 	return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net);
 }
 
-static int ipmr_dump(struct net *net, struct notifier_block *nb)
+static int ipmr_dump(struct net *net, struct notifier_block *nb,
+		     struct netlink_ext_ack *extack)
 {
 	return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump,
-		       ipmr_mr_table_iter, &mrt_lock);
+		       ipmr_mr_table_iter, &mrt_lock, extack);
 }
 
 static const struct fib_notifier_ops ipmr_notifier_ops_template = {
diff --git a/net/ipv4/ipmr_base.c b/net/ipv4/ipmr_base.c
index ea48bd1..aa8738a 100644
--- a/net/ipv4/ipmr_base.c
+++ b/net/ipv4/ipmr_base.c
@@ -386,15 +386,17 @@
 
 int mr_dump(struct net *net, struct notifier_block *nb, unsigned short family,
 	    int (*rules_dump)(struct net *net,
-			      struct notifier_block *nb),
+			      struct notifier_block *nb,
+			      struct netlink_ext_ack *extack),
 	    struct mr_table *(*mr_iter)(struct net *net,
 					struct mr_table *mrt),
-	    rwlock_t *mrt_lock)
+	    rwlock_t *mrt_lock,
+	    struct netlink_ext_ack *extack)
 {
 	struct mr_table *mrt;
 	int err;
 
-	err = rules_dump(net, nb);
+	err = rules_dump(net, nb, extack);
 	if (err)
 		return err;
 
@@ -409,17 +411,25 @@
 			if (!v->dev)
 				continue;
 
-			mr_call_vif_notifier(nb, net, family,
-					     FIB_EVENT_VIF_ADD,
-					     v, vifi, mrt->id);
+			err = mr_call_vif_notifier(nb, family,
+						   FIB_EVENT_VIF_ADD,
+						   v, vifi, mrt->id, extack);
+			if (err)
+				break;
 		}
 		read_unlock(mrt_lock);
 
+		if (err)
+			return err;
+
 		/* Notify on table MFC entries */
-		list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list)
-			mr_call_mfc_notifier(nb, net, family,
-					     FIB_EVENT_ENTRY_ADD,
-					     mfc, mrt->id);
+		list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) {
+			err = mr_call_mfc_notifier(nb, family,
+						   FIB_EVENT_ENTRY_ADD,
+						   mfc, mrt->id, extack);
+			if (err)
+				return err;
+		}
 	}
 
 	return 0;
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index f17b402..a2f4f89 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -94,7 +94,7 @@
 	depends on NETFILTER_ADVANCED
 	default NF_NAT && NF_CONNTRACK_SNMP
 	select ASN1
-	---help---
+	help
 
 	  This module implements an Application Layer Gateway (ALG) for
 	  SNMP payloads.  In conjunction with NAT, it allows a network
@@ -146,7 +146,7 @@
 	tristate '"ecn" match support'
 	depends on NETFILTER_ADVANCED
 	select NETFILTER_XT_MATCH_ECN
-	---help---
+	help
 	This is a backwards-compat option for the user's convenience
 	(e.g. when running oldconfig). It selects
 	CONFIG_NETFILTER_XT_MATCH_ECN.
@@ -155,7 +155,7 @@
 	tristate '"rpfilter" reverse path filter match support'
 	depends on NETFILTER_ADVANCED
 	depends on IP_NF_MANGLE || IP_NF_RAW
-	---help---
+	help
 	  This option allows you to match packets whose replies would
 	  go out via the interface the packet came in.
 
@@ -166,7 +166,7 @@
 	tristate '"ttl" match support'
 	depends on NETFILTER_ADVANCED
 	select NETFILTER_XT_MATCH_HL
-	---help---
+	help
 	This is a backwards-compat option for the user's convenience
 	(e.g. when running oldconfig). It selects
 	CONFIG_NETFILTER_XT_MATCH_HL.
@@ -234,7 +234,7 @@
 	tristate "NETMAP target support"
 	depends on NETFILTER_ADVANCED
 	select NETFILTER_XT_TARGET_NETMAP
-	---help---
+	help
 	This is a backwards-compat option for the user's convenience
 	(e.g. when running oldconfig). It selects
 	CONFIG_NETFILTER_XT_TARGET_NETMAP.
@@ -243,7 +243,7 @@
 	tristate "REDIRECT target support"
 	depends on NETFILTER_ADVANCED
 	select NETFILTER_XT_TARGET_REDIRECT
-	---help---
+	help
 	This is a backwards-compat option for the user's convenience
 	(e.g. when running oldconfig). It selects
 	CONFIG_NETFILTER_XT_TARGET_REDIRECT.
@@ -279,7 +279,7 @@
 	tristate "ECN target support"
 	depends on IP_NF_MANGLE
 	depends on NETFILTER_ADVANCED
-	---help---
+	help
 	  This option adds a `ECN' target, which can be used in the iptables mangle
 	  table.
 
@@ -294,7 +294,7 @@
 	tristate '"TTL" target support'
 	depends on NETFILTER_ADVANCED && IP_NF_MANGLE
 	select NETFILTER_XT_TARGET_HL
-	---help---
+	help
 	This is a backwards-compatible option for the user's convenience
 	(e.g. when running oldconfig). It selects
 	CONFIG_NETFILTER_XT_TARGET_HL.
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index a6f2e5b..d6d45d8 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -787,8 +787,7 @@
 }
 #endif
 
-static int get_info(struct net *net, void __user *user,
-		    const int *len, int compat)
+static int get_info(struct net *net, void __user *user, const int *len)
 {
 	char name[XT_TABLE_MAXNAMELEN];
 	struct xt_table *t;
@@ -802,7 +801,7 @@
 
 	name[XT_TABLE_MAXNAMELEN-1] = '\0';
 #ifdef CONFIG_COMPAT
-	if (compat)
+	if (in_compat_syscall())
 		xt_compat_lock(NFPROTO_ARP);
 #endif
 	t = xt_request_find_table_lock(net, NFPROTO_ARP, name);
@@ -812,7 +811,7 @@
 #ifdef CONFIG_COMPAT
 		struct xt_table_info tmp;
 
-		if (compat) {
+		if (in_compat_syscall()) {
 			ret = compat_table_info(private, &tmp);
 			xt_compat_flush_offsets(NFPROTO_ARP);
 			private = &tmp;
@@ -837,7 +836,7 @@
 	} else
 		ret = PTR_ERR(t);
 #ifdef CONFIG_COMPAT
-	if (compat)
+	if (in_compat_syscall())
 		xt_compat_unlock(NFPROTO_ARP);
 #endif
 	return ret;
@@ -948,8 +947,7 @@
 	return ret;
 }
 
-static int do_replace(struct net *net, const void __user *user,
-		      unsigned int len)
+static int do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret;
 	struct arpt_replace tmp;
@@ -957,7 +955,7 @@
 	void *loc_cpu_entry;
 	struct arpt_entry *iter;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -973,8 +971,8 @@
 		return -ENOMEM;
 
 	loc_cpu_entry = newinfo->entries;
-	if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
-			   tmp.size) != 0) {
+	if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
+			tmp.size) != 0) {
 		ret = -EFAULT;
 		goto free_newinfo;
 	}
@@ -997,8 +995,7 @@
 	return ret;
 }
 
-static int do_add_counters(struct net *net, const void __user *user,
-			   unsigned int len, int compat)
+static int do_add_counters(struct net *net, sockptr_t arg, unsigned int len)
 {
 	unsigned int i;
 	struct xt_counters_info tmp;
@@ -1009,7 +1006,7 @@
 	struct arpt_entry *iter;
 	unsigned int addend;
 
-	paddc = xt_copy_counters_from_user(user, len, &tmp, compat);
+	paddc = xt_copy_counters(arg, len, &tmp);
 	if (IS_ERR(paddc))
 		return PTR_ERR(paddc);
 
@@ -1057,7 +1054,7 @@
 	u32				underflow[NF_ARP_NUMHOOKS];
 	u32				num_counters;
 	compat_uptr_t			counters;
-	struct compat_arpt_entry	entries[0];
+	struct compat_arpt_entry	entries[];
 };
 
 static inline void compat_release_entry(struct compat_arpt_entry *e)
@@ -1248,8 +1245,7 @@
 	return ret;
 }
 
-static int compat_do_replace(struct net *net, void __user *user,
-			     unsigned int len)
+static int compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret;
 	struct compat_arpt_replace tmp;
@@ -1257,7 +1253,7 @@
 	void *loc_cpu_entry;
 	struct arpt_entry *iter;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -1273,7 +1269,8 @@
 		return -ENOMEM;
 
 	loc_cpu_entry = newinfo->entries;
-	if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), tmp.size) != 0) {
+	if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
+			tmp.size) != 0) {
 		ret = -EFAULT;
 		goto free_newinfo;
 	}
@@ -1296,30 +1293,6 @@
 	return ret;
 }
 
-static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user,
-				  unsigned int len)
-{
-	int ret;
-
-	if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
-		return -EPERM;
-
-	switch (cmd) {
-	case ARPT_SO_SET_REPLACE:
-		ret = compat_do_replace(sock_net(sk), user, len);
-		break;
-
-	case ARPT_SO_SET_ADD_COUNTERS:
-		ret = do_add_counters(sock_net(sk), user, len, 1);
-		break;
-
-	default:
-		ret = -EINVAL;
-	}
-
-	return ret;
-}
-
 static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr,
 				     compat_uint_t *size,
 				     struct xt_counters *counters,
@@ -1385,7 +1358,7 @@
 struct compat_arpt_get_entries {
 	char name[XT_TABLE_MAXNAMELEN];
 	compat_uint_t size;
-	struct compat_arpt_entry entrytable[0];
+	struct compat_arpt_entry entrytable[];
 };
 
 static int compat_get_entries(struct net *net,
@@ -1427,32 +1400,10 @@
 	xt_compat_unlock(NFPROTO_ARP);
 	return ret;
 }
-
-static int do_arpt_get_ctl(struct sock *, int, void __user *, int *);
-
-static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user,
-				  int *len)
-{
-	int ret;
-
-	if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
-		return -EPERM;
-
-	switch (cmd) {
-	case ARPT_SO_GET_INFO:
-		ret = get_info(sock_net(sk), user, len, 1);
-		break;
-	case ARPT_SO_GET_ENTRIES:
-		ret = compat_get_entries(sock_net(sk), user, len);
-		break;
-	default:
-		ret = do_arpt_get_ctl(sk, cmd, user, len);
-	}
-	return ret;
-}
 #endif
 
-static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+static int do_arpt_set_ctl(struct sock *sk, int cmd, sockptr_t arg,
+		unsigned int len)
 {
 	int ret;
 
@@ -1461,11 +1412,16 @@
 
 	switch (cmd) {
 	case ARPT_SO_SET_REPLACE:
-		ret = do_replace(sock_net(sk), user, len);
+#ifdef CONFIG_COMPAT
+		if (in_compat_syscall())
+			ret = compat_do_replace(sock_net(sk), arg, len);
+		else
+#endif
+			ret = do_replace(sock_net(sk), arg, len);
 		break;
 
 	case ARPT_SO_SET_ADD_COUNTERS:
-		ret = do_add_counters(sock_net(sk), user, len, 0);
+		ret = do_add_counters(sock_net(sk), arg, len);
 		break;
 
 	default:
@@ -1484,11 +1440,16 @@
 
 	switch (cmd) {
 	case ARPT_SO_GET_INFO:
-		ret = get_info(sock_net(sk), user, len, 0);
+		ret = get_info(sock_net(sk), user, len);
 		break;
 
 	case ARPT_SO_GET_ENTRIES:
-		ret = get_entries(sock_net(sk), user, len);
+#ifdef CONFIG_COMPAT
+		if (in_compat_syscall())
+			ret = compat_get_entries(sock_net(sk), user, len);
+		else
+#endif
+			ret = get_entries(sock_net(sk), user, len);
 		break;
 
 	case ARPT_SO_GET_REVISION_TARGET: {
@@ -1617,15 +1578,9 @@
 	.set_optmin	= ARPT_BASE_CTL,
 	.set_optmax	= ARPT_SO_SET_MAX+1,
 	.set		= do_arpt_set_ctl,
-#ifdef CONFIG_COMPAT
-	.compat_set	= compat_do_arpt_set_ctl,
-#endif
 	.get_optmin	= ARPT_BASE_CTL,
 	.get_optmax	= ARPT_SO_GET_MAX+1,
 	.get		= do_arpt_get_ctl,
-#ifdef CONFIG_COMPAT
-	.compat_get	= compat_do_arpt_get_ctl,
-#endif
 	.owner		= THIS_MODULE,
 };
 
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 0076449..f77ea0d 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -944,8 +944,7 @@
 }
 #endif
 
-static int get_info(struct net *net, void __user *user,
-		    const int *len, int compat)
+static int get_info(struct net *net, void __user *user, const int *len)
 {
 	char name[XT_TABLE_MAXNAMELEN];
 	struct xt_table *t;
@@ -959,7 +958,7 @@
 
 	name[XT_TABLE_MAXNAMELEN-1] = '\0';
 #ifdef CONFIG_COMPAT
-	if (compat)
+	if (in_compat_syscall())
 		xt_compat_lock(AF_INET);
 #endif
 	t = xt_request_find_table_lock(net, AF_INET, name);
@@ -969,7 +968,7 @@
 #ifdef CONFIG_COMPAT
 		struct xt_table_info tmp;
 
-		if (compat) {
+		if (in_compat_syscall()) {
 			ret = compat_table_info(private, &tmp);
 			xt_compat_flush_offsets(AF_INET);
 			private = &tmp;
@@ -995,7 +994,7 @@
 	} else
 		ret = PTR_ERR(t);
 #ifdef CONFIG_COMPAT
-	if (compat)
+	if (in_compat_syscall())
 		xt_compat_unlock(AF_INET);
 #endif
 	return ret;
@@ -1103,7 +1102,7 @@
 }
 
 static int
-do_replace(struct net *net, const void __user *user, unsigned int len)
+do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret;
 	struct ipt_replace tmp;
@@ -1111,7 +1110,7 @@
 	void *loc_cpu_entry;
 	struct ipt_entry *iter;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -1127,8 +1126,8 @@
 		return -ENOMEM;
 
 	loc_cpu_entry = newinfo->entries;
-	if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
-			   tmp.size) != 0) {
+	if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
+			tmp.size) != 0) {
 		ret = -EFAULT;
 		goto free_newinfo;
 	}
@@ -1152,8 +1151,7 @@
 }
 
 static int
-do_add_counters(struct net *net, const void __user *user,
-		unsigned int len, int compat)
+do_add_counters(struct net *net, sockptr_t arg, unsigned int len)
 {
 	unsigned int i;
 	struct xt_counters_info tmp;
@@ -1164,7 +1162,7 @@
 	struct ipt_entry *iter;
 	unsigned int addend;
 
-	paddc = xt_copy_counters_from_user(user, len, &tmp, compat);
+	paddc = xt_copy_counters(arg, len, &tmp);
 	if (IS_ERR(paddc))
 		return PTR_ERR(paddc);
 
@@ -1211,7 +1209,7 @@
 	u32			underflow[NF_INET_NUMHOOKS];
 	u32			num_counters;
 	compat_uptr_t		counters;	/* struct xt_counters * */
-	struct compat_ipt_entry	entries[0];
+	struct compat_ipt_entry	entries[];
 };
 
 static int
@@ -1488,7 +1486,7 @@
 }
 
 static int
-compat_do_replace(struct net *net, void __user *user, unsigned int len)
+compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret;
 	struct compat_ipt_replace tmp;
@@ -1496,7 +1494,7 @@
 	void *loc_cpu_entry;
 	struct ipt_entry *iter;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -1512,8 +1510,8 @@
 		return -ENOMEM;
 
 	loc_cpu_entry = newinfo->entries;
-	if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
-			   tmp.size) != 0) {
+	if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
+			tmp.size) != 0) {
 		ret = -EFAULT;
 		goto free_newinfo;
 	}
@@ -1536,35 +1534,10 @@
 	return ret;
 }
 
-static int
-compat_do_ipt_set_ctl(struct sock *sk,	int cmd, void __user *user,
-		      unsigned int len)
-{
-	int ret;
-
-	if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
-		return -EPERM;
-
-	switch (cmd) {
-	case IPT_SO_SET_REPLACE:
-		ret = compat_do_replace(sock_net(sk), user, len);
-		break;
-
-	case IPT_SO_SET_ADD_COUNTERS:
-		ret = do_add_counters(sock_net(sk), user, len, 1);
-		break;
-
-	default:
-		ret = -EINVAL;
-	}
-
-	return ret;
-}
-
 struct compat_ipt_get_entries {
 	char name[XT_TABLE_MAXNAMELEN];
 	compat_uint_t size;
-	struct compat_ipt_entry entrytable[0];
+	struct compat_ipt_entry entrytable[];
 };
 
 static int
@@ -1636,33 +1609,10 @@
 	xt_compat_unlock(AF_INET);
 	return ret;
 }
-
-static int do_ipt_get_ctl(struct sock *, int, void __user *, int *);
-
-static int
-compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
-{
-	int ret;
-
-	if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
-		return -EPERM;
-
-	switch (cmd) {
-	case IPT_SO_GET_INFO:
-		ret = get_info(sock_net(sk), user, len, 1);
-		break;
-	case IPT_SO_GET_ENTRIES:
-		ret = compat_get_entries(sock_net(sk), user, len);
-		break;
-	default:
-		ret = do_ipt_get_ctl(sk, cmd, user, len);
-	}
-	return ret;
-}
 #endif
 
 static int
-do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+do_ipt_set_ctl(struct sock *sk, int cmd, sockptr_t arg, unsigned int len)
 {
 	int ret;
 
@@ -1671,11 +1621,16 @@
 
 	switch (cmd) {
 	case IPT_SO_SET_REPLACE:
-		ret = do_replace(sock_net(sk), user, len);
+#ifdef CONFIG_COMPAT
+		if (in_compat_syscall())
+			ret = compat_do_replace(sock_net(sk), arg, len);
+		else
+#endif
+			ret = do_replace(sock_net(sk), arg, len);
 		break;
 
 	case IPT_SO_SET_ADD_COUNTERS:
-		ret = do_add_counters(sock_net(sk), user, len, 0);
+		ret = do_add_counters(sock_net(sk), arg, len);
 		break;
 
 	default:
@@ -1695,11 +1650,16 @@
 
 	switch (cmd) {
 	case IPT_SO_GET_INFO:
-		ret = get_info(sock_net(sk), user, len, 0);
+		ret = get_info(sock_net(sk), user, len);
 		break;
 
 	case IPT_SO_GET_ENTRIES:
-		ret = get_entries(sock_net(sk), user, len);
+#ifdef CONFIG_COMPAT
+		if (in_compat_syscall())
+			ret = compat_get_entries(sock_net(sk), user, len);
+		else
+#endif
+			ret = get_entries(sock_net(sk), user, len);
 		break;
 
 	case IPT_SO_GET_REVISION_MATCH:
@@ -1799,11 +1759,22 @@
 	return ret;
 }
 
+void ipt_unregister_table_pre_exit(struct net *net, struct xt_table *table,
+				   const struct nf_hook_ops *ops)
+{
+	nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks));
+}
+
+void ipt_unregister_table_exit(struct net *net, struct xt_table *table)
+{
+	__ipt_unregister_table(net, table);
+}
+
 void ipt_unregister_table(struct net *net, struct xt_table *table,
 			  const struct nf_hook_ops *ops)
 {
 	if (ops)
-		nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks));
+		ipt_unregister_table_pre_exit(net, table, ops);
 	__ipt_unregister_table(net, table);
 }
 
@@ -1877,15 +1848,9 @@
 	.set_optmin	= IPT_BASE_CTL,
 	.set_optmax	= IPT_SO_SET_MAX+1,
 	.set		= do_ipt_set_ctl,
-#ifdef CONFIG_COMPAT
-	.compat_set	= compat_do_ipt_set_ctl,
-#endif
 	.get_optmin	= IPT_BASE_CTL,
 	.get_optmax	= IPT_SO_GET_MAX+1,
 	.get		= do_ipt_get_ctl,
-#ifdef CONFIG_COMPAT
-	.compat_get	= compat_do_ipt_get_ctl,
-#endif
 	.owner		= THIS_MODULE,
 };
 
@@ -1960,6 +1925,8 @@
 
 EXPORT_SYMBOL(ipt_register_table);
 EXPORT_SYMBOL(ipt_unregister_table);
+EXPORT_SYMBOL(ipt_unregister_table_pre_exit);
+EXPORT_SYMBOL(ipt_unregister_table_exit);
 EXPORT_SYMBOL(ipt_do_table);
 module_init(ip_tables_init);
 module_exit(ip_tables_fini);
diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
index 6bdb1ab..1088564 100644
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -3,7 +3,7 @@
  * (C) 2003-2004 by Harald Welte <laforge@netfilter.org>
  * based on ideas of Fabio Olive Leite <olive@unixforge.org>
  *
- * Development of this code funded by SuSE Linux AG, http://www.suse.com/
+ * Development of this code funded by SuSE Linux AG, https://www.suse.com/
  */
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 #include <linux/module.h>
@@ -58,7 +58,7 @@
 };
 
 #ifdef CONFIG_PROC_FS
-static const struct file_operations clusterip_proc_fops;
+static const struct proc_ops clusterip_proc_ops;
 #endif
 
 struct clusterip_net {
@@ -280,7 +280,7 @@
 		mutex_lock(&cn->mutex);
 		c->pde = proc_create_data(buffer, 0600,
 					  cn->procdir,
-					  &clusterip_proc_fops, c);
+					  &clusterip_proc_ops, c);
 		mutex_unlock(&cn->mutex);
 		if (!c->pde) {
 			err = -ENOMEM;
@@ -505,8 +505,11 @@
 			if (IS_ERR(config))
 				return PTR_ERR(config);
 		}
-	} else if (memcmp(&config->clustermac, &cipinfo->clustermac, ETH_ALEN))
+	} else if (memcmp(&config->clustermac, &cipinfo->clustermac, ETH_ALEN)) {
+		clusterip_config_entry_put(config);
+		clusterip_config_put(config);
 		return -EINVAL;
+	}
 
 	ret = nf_ct_netns_get(par->net, par->family);
 	if (ret < 0) {
@@ -804,12 +807,12 @@
 	return size;
 }
 
-static const struct file_operations clusterip_proc_fops = {
-	.open	 = clusterip_proc_open,
-	.read	 = seq_read,
-	.write	 = clusterip_proc_write,
-	.llseek	 = seq_lseek,
-	.release = clusterip_proc_release,
+static const struct proc_ops clusterip_proc_ops = {
+	.proc_open	= clusterip_proc_open,
+	.proc_read	= seq_read,
+	.proc_write	= clusterip_proc_write,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= clusterip_proc_release,
 };
 
 #endif /* CONFIG_PROC_FS */
diff --git a/net/ipv4/netfilter/ipt_SYNPROXY.c b/net/ipv4/netfilter/ipt_SYNPROXY.c
index 748dc3c..f2984c7 100644
--- a/net/ipv4/netfilter/ipt_SYNPROXY.c
+++ b/net/ipv4/netfilter/ipt_SYNPROXY.c
@@ -118,3 +118,4 @@
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_DESCRIPTION("Intercept TCP connections and establish them using syncookies");
diff --git a/net/ipv4/netfilter/iptable_filter.c b/net/ipv4/netfilter/iptable_filter.c
index 9d54b40..8f7bc1e 100644
--- a/net/ipv4/netfilter/iptable_filter.c
+++ b/net/ipv4/netfilter/iptable_filter.c
@@ -72,16 +72,24 @@
 	return 0;
 }
 
+static void __net_exit iptable_filter_net_pre_exit(struct net *net)
+{
+	if (net->ipv4.iptable_filter)
+		ipt_unregister_table_pre_exit(net, net->ipv4.iptable_filter,
+					      filter_ops);
+}
+
 static void __net_exit iptable_filter_net_exit(struct net *net)
 {
 	if (!net->ipv4.iptable_filter)
 		return;
-	ipt_unregister_table(net, net->ipv4.iptable_filter, filter_ops);
+	ipt_unregister_table_exit(net, net->ipv4.iptable_filter);
 	net->ipv4.iptable_filter = NULL;
 }
 
 static struct pernet_operations iptable_filter_net_ops = {
 	.init = iptable_filter_net_init,
+	.pre_exit = iptable_filter_net_pre_exit,
 	.exit = iptable_filter_net_exit,
 };
 
diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index ae45bcd..8330795 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -100,15 +100,23 @@
 	return ret;
 }
 
+static void __net_exit iptable_mangle_net_pre_exit(struct net *net)
+{
+	if (net->ipv4.iptable_mangle)
+		ipt_unregister_table_pre_exit(net, net->ipv4.iptable_mangle,
+					      mangle_ops);
+}
+
 static void __net_exit iptable_mangle_net_exit(struct net *net)
 {
 	if (!net->ipv4.iptable_mangle)
 		return;
-	ipt_unregister_table(net, net->ipv4.iptable_mangle, mangle_ops);
+	ipt_unregister_table_exit(net, net->ipv4.iptable_mangle);
 	net->ipv4.iptable_mangle = NULL;
 }
 
 static struct pernet_operations iptable_mangle_net_ops = {
+	.pre_exit = iptable_mangle_net_pre_exit,
 	.exit = iptable_mangle_net_exit,
 };
 
diff --git a/net/ipv4/netfilter/iptable_nat.c b/net/ipv4/netfilter/iptable_nat.c
index ad33687..b0143b1 100644
--- a/net/ipv4/netfilter/iptable_nat.c
+++ b/net/ipv4/netfilter/iptable_nat.c
@@ -113,16 +113,22 @@
 	return ret;
 }
 
+static void __net_exit iptable_nat_net_pre_exit(struct net *net)
+{
+	if (net->ipv4.nat_table)
+		ipt_nat_unregister_lookups(net);
+}
+
 static void __net_exit iptable_nat_net_exit(struct net *net)
 {
 	if (!net->ipv4.nat_table)
 		return;
-	ipt_nat_unregister_lookups(net);
-	ipt_unregister_table(net, net->ipv4.nat_table, NULL);
+	ipt_unregister_table_exit(net, net->ipv4.nat_table);
 	net->ipv4.nat_table = NULL;
 }
 
 static struct pernet_operations iptable_nat_net_ops = {
+	.pre_exit = iptable_nat_net_pre_exit,
 	.exit	= iptable_nat_net_exit,
 };
 
diff --git a/net/ipv4/netfilter/iptable_raw.c b/net/ipv4/netfilter/iptable_raw.c
index 69697eb..9abfe6b 100644
--- a/net/ipv4/netfilter/iptable_raw.c
+++ b/net/ipv4/netfilter/iptable_raw.c
@@ -67,15 +67,23 @@
 	return ret;
 }
 
+static void __net_exit iptable_raw_net_pre_exit(struct net *net)
+{
+	if (net->ipv4.iptable_raw)
+		ipt_unregister_table_pre_exit(net, net->ipv4.iptable_raw,
+					      rawtable_ops);
+}
+
 static void __net_exit iptable_raw_net_exit(struct net *net)
 {
 	if (!net->ipv4.iptable_raw)
 		return;
-	ipt_unregister_table(net, net->ipv4.iptable_raw, rawtable_ops);
+	ipt_unregister_table_exit(net, net->ipv4.iptable_raw);
 	net->ipv4.iptable_raw = NULL;
 }
 
 static struct pernet_operations iptable_raw_net_ops = {
+	.pre_exit = iptable_raw_net_pre_exit,
 	.exit = iptable_raw_net_exit,
 };
 
diff --git a/net/ipv4/netfilter/iptable_security.c b/net/ipv4/netfilter/iptable_security.c
index ac633c1..415c197 100644
--- a/net/ipv4/netfilter/iptable_security.c
+++ b/net/ipv4/netfilter/iptable_security.c
@@ -62,16 +62,23 @@
 	return ret;
 }
 
+static void __net_exit iptable_security_net_pre_exit(struct net *net)
+{
+	if (net->ipv4.iptable_security)
+		ipt_unregister_table_pre_exit(net, net->ipv4.iptable_security,
+					      sectbl_ops);
+}
+
 static void __net_exit iptable_security_net_exit(struct net *net)
 {
 	if (!net->ipv4.iptable_security)
 		return;
-
-	ipt_unregister_table(net, net->ipv4.iptable_security, sectbl_ops);
+	ipt_unregister_table_exit(net, net->ipv4.iptable_security);
 	net->ipv4.iptable_security = NULL;
 }
 
 static struct pernet_operations iptable_security_net_ops = {
+	.pre_exit = iptable_security_net_pre_exit,
 	.exit = iptable_security_net_exit,
 };
 
diff --git a/net/ipv4/netfilter/nf_flow_table_ipv4.c b/net/ipv4/netfilter/nf_flow_table_ipv4.c
index 012c404..aba65fe 100644
--- a/net/ipv4/netfilter/nf_flow_table_ipv4.c
+++ b/net/ipv4/netfilter/nf_flow_table_ipv4.c
@@ -9,6 +9,8 @@
 static struct nf_flowtable_type flowtable_ipv4 = {
 	.family		= NFPROTO_IPV4,
 	.init		= nf_flow_table_init,
+	.setup		= nf_flow_table_offload_setup,
+	.action		= nf_flow_rule_route_ipv4,
 	.free		= nf_flow_table_free,
 	.hook		= nf_flow_offload_ip_hook,
 	.owner		= THIS_MODULE,
@@ -32,3 +34,4 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
 MODULE_ALIAS_NF_FLOWTABLE(AF_INET);
+MODULE_DESCRIPTION("Netfilter flow table support");
diff --git a/net/ipv4/netfilter/nf_log_ipv4.c b/net/ipv4/netfilter/nf_log_ipv4.c
index cb288ff..d07583f 100644
--- a/net/ipv4/netfilter/nf_log_ipv4.c
+++ b/net/ipv4/netfilter/nf_log_ipv4.c
@@ -173,7 +173,7 @@
 		case ICMP_REDIRECT:
 			/* Max length: 24 "GATEWAY=255.255.255.255 " */
 			nf_log_buf_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
-			/* Fall through */
+			fallthrough;
 		case ICMP_DEST_UNREACH:
 		case ICMP_SOURCE_QUENCH:
 		case ICMP_TIME_EXCEEDED:
diff --git a/net/ipv4/netfilter/nf_nat_pptp.c b/net/ipv4/netfilter/nf_nat_pptp.c
index 2a1e10f..3f248a1 100644
--- a/net/ipv4/netfilter/nf_nat_pptp.c
+++ b/net/ipv4/netfilter/nf_nat_pptp.c
@@ -3,7 +3,7 @@
  * nf_nat_pptp.c
  *
  * NAT support for PPTP (Point to Point Tunneling Protocol).
- * PPTP is a a protocol for creating virtual private networks.
+ * PPTP is a protocol for creating virtual private networks.
  * It is a specification defined by Microsoft and some vendors
  * working with Microsoft.  PPTP is built on top of a modified
  * version of the Internet Generic Routing Encapsulation Protocol.
@@ -167,7 +167,7 @@
 	default:
 		pr_debug("unknown outbound packet 0x%04x:%s\n", msg,
 			 pptp_msg_name(msg));
-		/* fall through */
+		fallthrough;
 	case PPTP_SET_LINK_INFO:
 		/* only need to NAT in case PAC is behind NAT box */
 	case PPTP_START_SESSION_REQUEST:
@@ -268,7 +268,7 @@
 		break;
 	default:
 		pr_debug("unknown inbound packet %s\n", pptp_msg_name(msg));
-		/* fall through */
+		fallthrough;
 	case PPTP_START_SESSION_REQUEST:
 	case PPTP_START_SESSION_REPLY:
 	case PPTP_STOP_SESSION_REQUEST:
diff --git a/net/ipv4/netfilter/nf_reject_ipv4.c b/net/ipv4/netfilter/nf_reject_ipv4.c
index 5781731..93b0773 100644
--- a/net/ipv4/netfilter/nf_reject_ipv4.c
+++ b/net/ipv4/netfilter/nf_reject_ipv4.c
@@ -96,6 +96,21 @@
 }
 EXPORT_SYMBOL_GPL(nf_reject_ip_tcphdr_put);
 
+static int nf_reject_fill_skb_dst(struct sk_buff *skb_in)
+{
+	struct dst_entry *dst = NULL;
+	struct flowi fl;
+
+	memset(&fl, 0, sizeof(struct flowi));
+	fl.u.ip4.daddr = ip_hdr(skb_in)->saddr;
+	nf_ip_route(dev_net(skb_in->dev), &dst, &fl, false);
+	if (!dst)
+		return -1;
+
+	skb_dst_set(skb_in, dst);
+	return 0;
+}
+
 /* Send RST reply */
 void nf_send_reset(struct net *net, struct sk_buff *oldskb, int hook)
 {
@@ -109,6 +124,9 @@
 	if (!oth)
 		return;
 
+	if (hook == NF_INET_PRE_ROUTING && nf_reject_fill_skb_dst(oldskb))
+		return;
+
 	if (skb_rtable(oldskb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
 		return;
 
@@ -175,6 +193,9 @@
 	if (iph->frag_off & htons(IP_OFFSET))
 		return;
 
+	if (hook == NF_INET_PRE_ROUTING && nf_reject_fill_skb_dst(skb_in))
+		return;
+
 	if (skb_csum_unnecessary(skb_in) || !nf_reject_verify_csum(proto)) {
 		icmp_send(skb_in, ICMP_DEST_UNREACH, code, 0);
 		return;
diff --git a/net/ipv4/netfilter/nf_socket_ipv4.c b/net/ipv4/netfilter/nf_socket_ipv4.c
index 36a28d4..2d42e4c 100644
--- a/net/ipv4/netfilter/nf_socket_ipv4.c
+++ b/net/ipv4/netfilter/nf_socket_ipv4.c
@@ -31,16 +31,8 @@
 	if (icmph == NULL)
 		return 1;
 
-	switch (icmph->type) {
-	case ICMP_DEST_UNREACH:
-	case ICMP_SOURCE_QUENCH:
-	case ICMP_REDIRECT:
-	case ICMP_TIME_EXCEEDED:
-	case ICMP_PARAMETERPROB:
-		break;
-	default:
+	if (!icmp_is_err(icmph->type))
 		return 1;
-	}
 
 	inside_iph = skb_header_pointer(skb, outside_hdrlen +
 					sizeof(struct icmphdr),
@@ -92,11 +84,11 @@
 struct sock *nf_sk_lookup_slow_v4(struct net *net, const struct sk_buff *skb,
 				  const struct net_device *indev)
 {
-	__be32 uninitialized_var(daddr), uninitialized_var(saddr);
-	__be16 uninitialized_var(dport), uninitialized_var(sport);
+	__be32 daddr, saddr;
+	__be16 dport, sport;
 	const struct iphdr *iph = ip_hdr(skb);
 	struct sk_buff *data_skb = NULL;
-	u8 uninitialized_var(protocol);
+	u8 protocol;
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 	enum ip_conntrack_info ctinfo;
 	struct nf_conn const *ct;
diff --git a/net/ipv4/netfilter/nft_dup_ipv4.c b/net/ipv4/netfilter/nft_dup_ipv4.c
index abf89b9..bcdb37f 100644
--- a/net/ipv4/netfilter/nft_dup_ipv4.c
+++ b/net/ipv4/netfilter/nft_dup_ipv4.c
@@ -107,3 +107,4 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
 MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "dup");
+MODULE_DESCRIPTION("IPv4 nftables packet duplication support");
diff --git a/net/ipv4/netfilter/nft_fib_ipv4.c b/net/ipv4/netfilter/nft_fib_ipv4.c
index ce29411..03df986 100644
--- a/net/ipv4/netfilter/nft_fib_ipv4.c
+++ b/net/ipv4/netfilter/nft_fib_ipv4.c
@@ -210,3 +210,4 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
 MODULE_ALIAS_NFT_AF_EXPR(2, "fib");
+MODULE_DESCRIPTION("nftables fib / ip route lookup support");
diff --git a/net/ipv4/netfilter/nft_reject_ipv4.c b/net/ipv4/netfilter/nft_reject_ipv4.c
index 7e6fd5c..e408f81 100644
--- a/net/ipv4/netfilter/nft_reject_ipv4.c
+++ b/net/ipv4/netfilter/nft_reject_ipv4.c
@@ -71,3 +71,4 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "reject");
+MODULE_DESCRIPTION("IPv4 packet rejection for nftables");
diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index 858bb10..8bd3f5e 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -23,7 +23,6 @@
 #define NH_DEV_HASHSIZE (1U << NH_DEV_HASHBITS)
 
 static const struct nla_policy rtm_nh_policy[NHA_MAX + 1] = {
-	[NHA_UNSPEC]		= { .strict_start_type = NHA_UNSPEC + 1 },
 	[NHA_ID]		= { .type = NLA_U32 },
 	[NHA_GROUP]		= { .type = NLA_BINARY },
 	[NHA_GROUP_TYPE]	= { .type = NLA_U16 },
@@ -34,8 +33,20 @@
 	[NHA_ENCAP]		= { .type = NLA_NESTED },
 	[NHA_GROUPS]		= { .type = NLA_FLAG },
 	[NHA_MASTER]		= { .type = NLA_U32 },
+	[NHA_FDB]		= { .type = NLA_FLAG },
 };
 
+static int call_nexthop_notifiers(struct net *net,
+				  enum nexthop_event_type event_type,
+				  struct nexthop *nh)
+{
+	int err;
+
+	err = blocking_notifier_call_chain(&net->nexthop.notifier_chain,
+					   event_type, nh);
+	return notifier_to_errno(err);
+}
+
 static unsigned int nh_dev_hashfn(unsigned int val)
 {
 	unsigned int mask = NH_DEV_HASHSIZE - 1;
@@ -115,18 +126,16 @@
 		INIT_LIST_HEAD(&nh->fi_list);
 		INIT_LIST_HEAD(&nh->f6i_list);
 		INIT_LIST_HEAD(&nh->grp_list);
+		INIT_LIST_HEAD(&nh->fdb_list);
 	}
 	return nh;
 }
 
 static struct nh_group *nexthop_grp_alloc(u16 num_nh)
 {
-	size_t sz = offsetof(struct nexthop, nh_grp)
-		    + sizeof(struct nh_group)
-		    + sizeof(struct nh_grp_entry) * num_nh;
 	struct nh_group *nhg;
 
-	nhg = kzalloc(sz, GFP_KERNEL);
+	nhg = kzalloc(struct_size(nhg, nh_entries, num_nh), GFP_KERNEL);
 	if (nhg)
 		nhg->num_nh = num_nh;
 
@@ -238,6 +247,8 @@
 	if (nh->is_group) {
 		struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
 
+		if (nhg->fdb_nh && nla_put_flag(skb, NHA_FDB))
+			goto nla_put_failure;
 		if (nla_put_nh_group(skb, nhg))
 			goto nla_put_failure;
 		goto out;
@@ -249,6 +260,9 @@
 		if (nla_put_flag(skb, NHA_BLACKHOLE))
 			goto nla_put_failure;
 		goto out;
+	} else if (nhi->fdb_nh) {
+		if (nla_put_flag(skb, NHA_FDB))
+			goto nla_put_failure;
 	} else {
 		const struct net_device *dev;
 
@@ -262,7 +276,7 @@
 	case AF_INET:
 		fib_nh = &nhi->fib_nh;
 		if (fib_nh->fib_nh_gw_family &&
-		    nla_put_u32(skb, NHA_GATEWAY, fib_nh->fib_nh_gw4))
+		    nla_put_be32(skb, NHA_GATEWAY, fib_nh->fib_nh_gw4))
 			goto nla_put_failure;
 		break;
 
@@ -370,7 +384,7 @@
 }
 
 static bool valid_group_nh(struct nexthop *nh, unsigned int npaths,
-			   struct netlink_ext_ack *extack)
+			   bool *is_fdb, struct netlink_ext_ack *extack)
 {
 	if (nh->is_group) {
 		struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
@@ -383,6 +397,7 @@
 				       "Multipath group can not be a nexthop within a group");
 			return false;
 		}
+		*is_fdb = nhg->fdb_nh;
 	} else {
 		struct nh_info *nhi = rtnl_dereference(nh->nh_info);
 
@@ -391,17 +406,42 @@
 				       "Blackhole nexthop can not be used in a group with more than 1 path");
 			return false;
 		}
+		*is_fdb = nhi->fdb_nh;
 	}
 
 	return true;
 }
 
+static int nh_check_attr_fdb_group(struct nexthop *nh, u8 *nh_family,
+				   struct netlink_ext_ack *extack)
+{
+	struct nh_info *nhi;
+
+	nhi = rtnl_dereference(nh->nh_info);
+
+	if (!nhi->fdb_nh) {
+		NL_SET_ERR_MSG(extack, "FDB nexthop group can only have fdb nexthops");
+		return -EINVAL;
+	}
+
+	if (*nh_family == AF_UNSPEC) {
+		*nh_family = nhi->family;
+	} else if (*nh_family != nhi->family) {
+		NL_SET_ERR_MSG(extack, "FDB nexthop group cannot have mixed family nexthops");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int nh_check_attr_group(struct net *net, struct nlattr *tb[],
 			       struct netlink_ext_ack *extack)
 {
 	unsigned int len = nla_len(tb[NHA_GROUP]);
+	u8 nh_family = AF_UNSPEC;
 	struct nexthop_grp *nhg;
 	unsigned int i, j;
+	u8 nhg_fdb = 0;
 
 	if (!len || len & (sizeof(struct nexthop_grp) - 1)) {
 		NL_SET_ERR_MSG(extack,
@@ -430,22 +470,34 @@
 		}
 	}
 
+	if (tb[NHA_FDB])
+		nhg_fdb = 1;
 	nhg = nla_data(tb[NHA_GROUP]);
 	for (i = 0; i < len; ++i) {
 		struct nexthop *nh;
+		bool is_fdb_nh;
 
 		nh = nexthop_find_by_id(net, nhg[i].id);
 		if (!nh) {
 			NL_SET_ERR_MSG(extack, "Invalid nexthop id");
 			return -EINVAL;
 		}
-		if (!valid_group_nh(nh, len, extack))
+		if (!valid_group_nh(nh, len, &is_fdb_nh, extack))
 			return -EINVAL;
+
+		if (nhg_fdb && nh_check_attr_fdb_group(nh, &nh_family, extack))
+			return -EINVAL;
+
+		if (!nhg_fdb && is_fdb_nh) {
+			NL_SET_ERR_MSG(extack, "Non FDB nexthop group cannot have fdb nexthops");
+			return -EINVAL;
+		}
 	}
 	for (i = NHA_GROUP_TYPE + 1; i < __NHA_MAX; ++i) {
 		if (!tb[i])
 			continue;
-
+		if (i == NHA_FDB)
+			continue;
 		NL_SET_ERR_MSG(extack,
 			       "No other attributes can be set in nexthop groups");
 		return -EINVAL;
@@ -504,10 +556,13 @@
 		if (hash > atomic_read(&nhge->upper_bound))
 			continue;
 
+		nhi = rcu_dereference(nhge->nh->nh_info);
+		if (nhi->fdb_nh)
+			return nhge->nh;
+
 		/* nexthops always check if it is good and does
 		 * not rely on a sysctl for this behavior
 		 */
-		nhi = rcu_dereference(nhge->nh->nh_info);
 		switch (nhi->family) {
 		case AF_INET:
 			if (ipv4_good_nh(&nhi->fib_nh))
@@ -572,6 +627,7 @@
 		       struct netlink_ext_ack *extack)
 {
 	struct nh_info *nhi;
+	bool is_fdb_nh;
 
 	/* fib6_src is unique to a fib6_info and limits the ability to cache
 	 * routes in fib6_nh within a nexthop that is potentially shared
@@ -588,10 +644,17 @@
 		nhg = rtnl_dereference(nh->nh_grp);
 		if (nhg->has_v4)
 			goto no_v4_nh;
+		is_fdb_nh = nhg->fdb_nh;
 	} else {
 		nhi = rtnl_dereference(nh->nh_info);
 		if (nhi->family == AF_INET)
 			goto no_v4_nh;
+		is_fdb_nh = nhi->fdb_nh;
+	}
+
+	if (is_fdb_nh) {
+		NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop");
+		return -EINVAL;
 	}
 
 	return 0;
@@ -620,12 +683,9 @@
 	return fib6_check_nexthop(new, NULL, extack);
 }
 
-static int nexthop_check_scope(struct nexthop *nh, u8 scope,
+static int nexthop_check_scope(struct nh_info *nhi, u8 scope,
 			       struct netlink_ext_ack *extack)
 {
-	struct nh_info *nhi;
-
-	nhi = rtnl_dereference(nh->nh_info);
 	if (scope == RT_SCOPE_HOST && nhi->fib_nhc.nhc_gw_family) {
 		NL_SET_ERR_MSG(extack,
 			       "Route with host scope can not have a gateway");
@@ -647,23 +707,38 @@
 int fib_check_nexthop(struct nexthop *nh, u8 scope,
 		      struct netlink_ext_ack *extack)
 {
+	struct nh_info *nhi;
 	int err = 0;
 
 	if (nh->is_group) {
 		struct nh_group *nhg;
 
+		nhg = rtnl_dereference(nh->nh_grp);
+		if (nhg->fdb_nh) {
+			NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop");
+			err = -EINVAL;
+			goto out;
+		}
+
 		if (scope == RT_SCOPE_HOST) {
 			NL_SET_ERR_MSG(extack, "Route with host scope can not have multiple nexthops");
 			err = -EINVAL;
 			goto out;
 		}
 
-		nhg = rtnl_dereference(nh->nh_grp);
 		/* all nexthops in a group have the same scope */
-		err = nexthop_check_scope(nhg->nh_entries[0].nh, scope, extack);
+		nhi = rtnl_dereference(nhg->nh_entries[0].nh->nh_info);
+		err = nexthop_check_scope(nhi, scope, extack);
 	} else {
-		err = nexthop_check_scope(nh, scope, extack);
+		nhi = rtnl_dereference(nh->nh_info);
+		if (nhi->fdb_nh) {
+			NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop");
+			err = -EINVAL;
+			goto out;
+		}
+		err = nexthop_check_scope(nhi, scope, extack);
 	}
+
 out:
 	return err;
 }
@@ -722,20 +797,27 @@
 		return;
 	}
 
-	newg->has_v4 = nhg->has_v4;
+	newg->has_v4 = false;
 	newg->mpath = nhg->mpath;
+	newg->fdb_nh = nhg->fdb_nh;
 	newg->num_nh = nhg->num_nh;
 
 	/* copy old entries to new except the one getting removed */
 	nhges = nhg->nh_entries;
 	new_nhges = newg->nh_entries;
 	for (i = 0, j = 0; i < nhg->num_nh; ++i) {
+		struct nh_info *nhi;
+
 		/* current nexthop getting removed */
 		if (nhg->nh_entries[i].nh == nh) {
 			newg->num_nh--;
 			continue;
 		}
 
+		nhi = rtnl_dereference(nhges[i].nh->nh_info);
+		if (nhi->family == AF_INET)
+			newg->has_v4 = true;
+
 		list_del(&nhges[i].nh_list);
 		new_nhges[j].nh_parent = nhges[i].nh_parent;
 		new_nhges[j].nh = nhges[i].nh;
@@ -799,7 +881,8 @@
 	list_for_each_entry_safe(f6i, tmp, &nh->f6i_list, nh_list) {
 		/* __ip6_del_rt does a release, so do a hold here */
 		fib6_info_hold(f6i);
-		ipv6_stub->ip6_del_rt(net, f6i);
+		ipv6_stub->ip6_del_rt(net, f6i,
+				      !net->ipv4.sysctl_nexthop_compat_mode);
 	}
 }
 
@@ -824,6 +907,8 @@
 static void remove_nexthop(struct net *net, struct nexthop *nh,
 			   struct nl_info *nlinfo)
 {
+	call_nexthop_notifiers(net, NEXTHOP_EVENT_DEL, nh);
+
 	/* remove from the tree */
 	rb_erase(&nh->rb_node, &net->nexthop.rb_root);
 
@@ -839,15 +924,36 @@
 /* if any FIB entries reference this nexthop, any dst entries
  * need to be regenerated
  */
-static void nh_rt_cache_flush(struct net *net, struct nexthop *nh)
+static void nh_rt_cache_flush(struct net *net, struct nexthop *nh,
+			      struct nexthop *replaced_nh)
 {
 	struct fib6_info *f6i;
+	struct nh_group *nhg;
+	int i;
 
 	if (!list_empty(&nh->fi_list))
 		rt_cache_flush(net);
 
 	list_for_each_entry(f6i, &nh->f6i_list, nh_list)
 		ipv6_stub->fib6_update_sernum(net, f6i);
+
+	/* if an IPv6 group was replaced, we have to release all old
+	 * dsts to make sure all refcounts are released
+	 */
+	if (!replaced_nh->is_group)
+		return;
+
+	/* new dsts must use only the new nexthop group */
+	synchronize_net();
+
+	nhg = rtnl_dereference(replaced_nh->nh_grp);
+	for (i = 0; i < nhg->num_nh; i++) {
+		struct nh_grp_entry *nhge = &nhg->nh_entries[i];
+		struct nh_info *nhi = rtnl_dereference(nhge->nh->nh_info);
+
+		if (nhi->family == AF_INET6)
+			ipv6_stub->fib6_nh_release_dsts(&nhi->fib6_nh);
+	}
 }
 
 static int replace_nexthop_grp(struct net *net, struct nexthop *old,
@@ -879,6 +985,23 @@
 	return 0;
 }
 
+static void nh_group_v4_update(struct nh_group *nhg)
+{
+	struct nh_grp_entry *nhges;
+	bool has_v4 = false;
+	int i;
+
+	nhges = nhg->nh_entries;
+	for (i = 0; i < nhg->num_nh; i++) {
+		struct nh_info *nhi;
+
+		nhi = rtnl_dereference(nhges[i].nh->nh_info);
+		if (nhi->family == AF_INET)
+			has_v4 = true;
+	}
+	nhg->has_v4 = has_v4;
+}
+
 static int replace_nexthop_single(struct net *net, struct nexthop *old,
 				  struct nexthop *new,
 				  struct netlink_ext_ack *extack)
@@ -902,6 +1025,21 @@
 	rcu_assign_pointer(old->nh_info, newi);
 	rcu_assign_pointer(new->nh_info, oldi);
 
+	/* When replacing an IPv4 nexthop with an IPv6 nexthop, potentially
+	 * update IPv4 indication in all the groups using the nexthop.
+	 */
+	if (oldi->family == AF_INET && newi->family == AF_INET6) {
+		struct nh_grp_entry *nhge;
+
+		list_for_each_entry(nhge, &old->grp_list, nh_list) {
+			struct nexthop *nhp = nhge->nh_parent;
+			struct nh_group *nhg;
+
+			nhg = rtnl_dereference(nhp->nh_grp);
+			nh_group_v4_update(nhg);
+		}
+	}
+
 	return 0;
 }
 
@@ -994,7 +1132,7 @@
 		err = replace_nexthop_single(net, old, new, extack);
 
 	if (!err) {
-		nh_rt_cache_flush(net, old);
+		nh_rt_cache_flush(net, old, new);
 
 		__remove_nexthop(net, new, NULL);
 		nexthop_put(new);
@@ -1019,7 +1157,7 @@
 	while (1) {
 		struct nexthop *nh;
 
-		next = rtnl_dereference(*pp);
+		next = *pp;
 		if (!next)
 			break;
 
@@ -1056,7 +1194,7 @@
 	if (!rc) {
 		nh_base_seq_inc(net);
 		nexthop_notify(RTM_NEWNEXTHOP, new_nh, &cfg->nlinfo);
-		if (replace_notify)
+		if (replace_notify && net->ipv4.sysctl_nexthop_compat_mode)
 			nexthop_replace_notify(net, new_nh, &cfg->nlinfo);
 	}
 
@@ -1126,10 +1264,10 @@
 
 	/* spare group used for removals */
 	nhg->spare = nexthop_grp_alloc(num_nh);
-	if (!nhg) {
+	if (!nhg->spare) {
 		kfree(nhg);
 		kfree(nh);
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 	}
 	nhg->spare->spare = nhg;
 
@@ -1156,6 +1294,9 @@
 		nh_group_rebalance(nhg);
 	}
 
+	if (cfg->nh_fdb)
+		nhg->fdb_nh = 1;
+
 	rcu_assign_pointer(nh->nh_grp, nhg);
 
 	return nh;
@@ -1187,7 +1328,7 @@
 		.fc_encap = cfg->nh_encap,
 		.fc_encap_type = cfg->nh_encap_type,
 	};
-	u32 tb_id = l3mdev_fib_table(cfg->dev);
+	u32 tb_id = (cfg->dev ? l3mdev_fib_table(cfg->dev) : RT_TABLE_MAIN);
 	int err;
 
 	err = fib_nh_init(net, fib_nh, &fib_cfg, 1, extack);
@@ -1196,6 +1337,9 @@
 		goto out;
 	}
 
+	if (nhi->fdb_nh)
+		goto out;
+
 	/* sets nh_dev if successful */
 	err = fib_check_nh(net, fib_nh, tb_id, 0, extack);
 	if (!err) {
@@ -1222,6 +1366,7 @@
 		.fc_nlinfo = cfg->nlinfo,
 		.fc_encap = cfg->nh_encap,
 		.fc_encap_type = cfg->nh_encap_type,
+		.fc_is_fdb = cfg->nh_fdb,
 	};
 	int err;
 
@@ -1231,11 +1376,15 @@
 	/* sets nh_dev if successful */
 	err = ipv6_stub->fib6_nh_init(net, fib6_nh, &fib6_cfg, GFP_KERNEL,
 				      extack);
-	if (err)
+	if (err) {
+		/* IPv6 is not enabled, don't call fib6_nh_release */
+		if (err == -EAFNOSUPPORT)
+			goto out;
 		ipv6_stub->fib6_nh_release(fib6_nh);
-	else
+	} else {
 		nh->nh_flags = fib6_nh->fib_nh_flags;
-
+	}
+out:
 	return err;
 }
 
@@ -1263,6 +1412,9 @@
 	nhi->family = cfg->nh_family;
 	nhi->fib_nhc.nhc_scope = RT_SCOPE_LINK;
 
+	if (cfg->nh_fdb)
+		nhi->fdb_nh = 1;
+
 	if (cfg->nh_blackhole) {
 		nhi->reject_nh = 1;
 		cfg->nh_ifindex = net->loopback_dev->ifindex;
@@ -1284,7 +1436,8 @@
 	}
 
 	/* add the entry to the device based hash */
-	nexthop_devhash_add(net, nhi);
+	if (!nhi->fdb_nh)
+		nexthop_devhash_add(net, nhi);
 
 	rcu_assign_pointer(nh->nh_info, nhi);
 
@@ -1364,7 +1517,7 @@
 	case AF_UNSPEC:
 		if (tb[NHA_GROUP])
 			break;
-		/* fallthrough */
+		fallthrough;
 	default:
 		NL_SET_ERR_MSG(extack, "Invalid address family");
 		goto out;
@@ -1388,6 +1541,19 @@
 	if (tb[NHA_ID])
 		cfg->nh_id = nla_get_u32(tb[NHA_ID]);
 
+	if (tb[NHA_FDB]) {
+		if (tb[NHA_OIF] || tb[NHA_BLACKHOLE] ||
+		    tb[NHA_ENCAP]   || tb[NHA_ENCAP_TYPE]) {
+			NL_SET_ERR_MSG(extack, "Fdb attribute can not be used with encap, oif or blackhole");
+			goto out;
+		}
+		if (nhm->nh_flags) {
+			NL_SET_ERR_MSG(extack, "Unsupported nexthop flags in ancillary header");
+			goto out;
+		}
+		cfg->nh_fdb = nla_get_flag(tb[NHA_FDB]);
+	}
+
 	if (tb[NHA_GROUP]) {
 		if (nhm->nh_family != AF_UNSPEC) {
 			NL_SET_ERR_MSG(extack, "Invalid family for group");
@@ -1411,8 +1577,8 @@
 
 	if (tb[NHA_BLACKHOLE]) {
 		if (tb[NHA_GATEWAY] || tb[NHA_OIF] ||
-		    tb[NHA_ENCAP]   || tb[NHA_ENCAP_TYPE]) {
-			NL_SET_ERR_MSG(extack, "Blackhole attribute can not be used with gateway or oif");
+		    tb[NHA_ENCAP]   || tb[NHA_ENCAP_TYPE] || tb[NHA_FDB]) {
+			NL_SET_ERR_MSG(extack, "Blackhole attribute can not be used with gateway, oif, encap or fdb");
 			goto out;
 		}
 
@@ -1421,26 +1587,28 @@
 		goto out;
 	}
 
-	if (!tb[NHA_OIF]) {
-		NL_SET_ERR_MSG(extack, "Device attribute required for non-blackhole nexthops");
+	if (!cfg->nh_fdb && !tb[NHA_OIF]) {
+		NL_SET_ERR_MSG(extack, "Device attribute required for non-blackhole and non-fdb nexthops");
 		goto out;
 	}
 
-	cfg->nh_ifindex = nla_get_u32(tb[NHA_OIF]);
-	if (cfg->nh_ifindex)
-		cfg->dev = __dev_get_by_index(net, cfg->nh_ifindex);
+	if (!cfg->nh_fdb && tb[NHA_OIF]) {
+		cfg->nh_ifindex = nla_get_u32(tb[NHA_OIF]);
+		if (cfg->nh_ifindex)
+			cfg->dev = __dev_get_by_index(net, cfg->nh_ifindex);
 
-	if (!cfg->dev) {
-		NL_SET_ERR_MSG(extack, "Invalid device index");
-		goto out;
-	} else if (!(cfg->dev->flags & IFF_UP)) {
-		NL_SET_ERR_MSG(extack, "Nexthop device is not up");
-		err = -ENETDOWN;
-		goto out;
-	} else if (!netif_carrier_ok(cfg->dev)) {
-		NL_SET_ERR_MSG(extack, "Carrier for nexthop device is down");
-		err = -ENETDOWN;
-		goto out;
+		if (!cfg->dev) {
+			NL_SET_ERR_MSG(extack, "Invalid device index");
+			goto out;
+		} else if (!(cfg->dev->flags & IFF_UP)) {
+			NL_SET_ERR_MSG(extack, "Nexthop device is not up");
+			err = -ENETDOWN;
+			goto out;
+		} else if (!netif_carrier_ok(cfg->dev)) {
+			NL_SET_ERR_MSG(extack, "Carrier for nexthop device is down");
+			err = -ENETDOWN;
+			goto out;
+		}
 	}
 
 	err = -EINVAL;
@@ -1669,7 +1837,7 @@
 
 static int nh_valid_dump_req(const struct nlmsghdr *nlh, int *dev_idx,
 			     int *master_idx, bool *group_filter,
-			     struct netlink_callback *cb)
+			     bool *fdb_filter, struct netlink_callback *cb)
 {
 	struct netlink_ext_ack *extack = cb->extack;
 	struct nlattr *tb[NHA_MAX + 1];
@@ -1706,6 +1874,9 @@
 		case NHA_GROUPS:
 			*group_filter = true;
 			break;
+		case NHA_FDB:
+			*fdb_filter = true;
+			break;
 		default:
 			NL_SET_ERR_MSG(extack, "Unsupported attribute in dump request");
 			return -EINVAL;
@@ -1724,17 +1895,17 @@
 /* rtnl */
 static int rtm_dump_nexthop(struct sk_buff *skb, struct netlink_callback *cb)
 {
+	bool group_filter = false, fdb_filter = false;
 	struct nhmsg *nhm = nlmsg_data(cb->nlh);
 	int dev_filter_idx = 0, master_idx = 0;
 	struct net *net = sock_net(skb->sk);
 	struct rb_root *root = &net->nexthop.rb_root;
-	bool group_filter = false;
 	struct rb_node *node;
 	int idx = 0, s_idx;
 	int err;
 
 	err = nh_valid_dump_req(cb->nlh, &dev_filter_idx, &master_idx,
-				&group_filter, cb);
+				&group_filter, &fdb_filter, cb);
 	if (err < 0)
 		return err;
 
@@ -1819,6 +1990,20 @@
 	.notifier_call = nh_netdev_event,
 };
 
+int register_nexthop_notifier(struct net *net, struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&net->nexthop.notifier_chain,
+						nb);
+}
+EXPORT_SYMBOL(register_nexthop_notifier);
+
+int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&net->nexthop.notifier_chain,
+						  nb);
+}
+EXPORT_SYMBOL(unregister_nexthop_notifier);
+
 static void __net_exit nexthop_net_exit(struct net *net)
 {
 	rtnl_lock();
@@ -1835,6 +2020,7 @@
 	net->nexthop.devhash = kzalloc(sz, GFP_KERNEL);
 	if (!net->nexthop.devhash)
 		return -ENOMEM;
+	BLOCKING_INIT_NOTIFIER_HEAD(&net->nexthop.notifier_chain);
 
 	return 0;
 }
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 1c3d5d3..e60ca03 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -172,16 +172,22 @@
 	struct sock *sk = NULL;
 	struct inet_sock *isk;
 	struct hlist_nulls_node *hnode;
-	int dif = skb->dev->ifindex;
+	int dif, sdif;
 
 	if (skb->protocol == htons(ETH_P_IP)) {
+		dif = inet_iif(skb);
+		sdif = inet_sdif(skb);
 		pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
 			 (int)ident, &ip_hdr(skb)->daddr, dif);
 #if IS_ENABLED(CONFIG_IPV6)
 	} else if (skb->protocol == htons(ETH_P_IPV6)) {
+		dif = inet6_iif(skb);
+		sdif = inet6_sdif(skb);
 		pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
 			 (int)ident, &ipv6_hdr(skb)->daddr, dif);
 #endif
+	} else {
+		return NULL;
 	}
 
 	read_lock_bh(&ping_table.lock);
@@ -220,7 +226,8 @@
 			continue;
 		}
 
-		if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
+		if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif &&
+		    sk->sk_bound_dev_if != sdif)
 			continue;
 
 		sock_hold(sk);
@@ -293,7 +300,8 @@
 
 /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
 static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
-				struct sockaddr *uaddr, int addr_len) {
+				struct sockaddr *uaddr, int addr_len)
+{
 	struct net *net = sock_net(sk);
 	if (sk->sk_family == AF_INET) {
 		struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
@@ -310,10 +318,10 @@
 		pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
 			 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
 
-		chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
-
 		if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
 			chk_addr_ret = RTN_LOCAL;
+		else
+			chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
 
 		if ((!inet_can_nonlocal_bind(net, isk) &&
 		     chk_addr_ret != RTN_LOCAL) ||
@@ -383,20 +391,6 @@
 	}
 }
 
-static void ping_clear_saddr(struct sock *sk, int dif)
-{
-	sk->sk_bound_dev_if = dif;
-	if (sk->sk_family == AF_INET) {
-		struct inet_sock *isk = inet_sk(sk);
-		isk->inet_rcv_saddr = isk->inet_saddr = 0;
-#if IS_ENABLED(CONFIG_IPV6)
-	} else if (sk->sk_family == AF_INET6) {
-		struct ipv6_pinfo *np = inet6_sk(sk);
-		memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
-		memset(&np->saddr, 0, sizeof(np->saddr));
-#endif
-	}
-}
 /*
  * We need our own bind because there are no privileged id's == local ports.
  * Moreover, we don't allow binding to multi- and broadcast addresses.
@@ -420,12 +414,13 @@
 		goto out;
 
 	err = -EADDRINUSE;
-	ping_set_saddr(sk, uaddr);
 	snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
 	if (ping_get_port(sk, snum) != 0) {
-		ping_clear_saddr(sk, dif);
+		/* Restore possibly modified sk->sk_bound_dev_if by ping_check_bind_addr(). */
+		sk->sk_bound_dev_if = dif;
 		goto out;
 	}
+	ping_set_saddr(sk, uaddr);
 
 	pr_debug("after bind(): num = %hu, dif = %d\n",
 		 isk->inet_num,
@@ -647,7 +642,8 @@
 }
 
 int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
-			void *user_icmph, size_t icmph_len) {
+			void *user_icmph, size_t icmph_len)
+{
 	u8 type, code;
 
 	if (len > 0xFFFF)
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index cc90243..80d13d8 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -32,6 +32,7 @@
 #include <net/icmp.h>
 #include <net/protocol.h>
 #include <net/tcp.h>
+#include <net/mptcp.h>
 #include <net/udp.h>
 #include <net/udplite.h>
 #include <linux/bottom_half.h>
@@ -52,7 +53,7 @@
 	struct net *net = seq->private;
 	int orphans, sockets;
 
-	orphans = percpu_counter_sum_positive(&tcp_orphan_count);
+	orphans = tcp_orphan_count_sum();
 	sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
 
 	socket_seq_show(seq);
@@ -289,6 +290,10 @@
 	SNMP_MIB_ITEM("TCPRcvQDrop", LINUX_MIB_TCPRCVQDROP),
 	SNMP_MIB_ITEM("TCPWqueueTooBig", LINUX_MIB_TCPWQUEUETOOBIG),
 	SNMP_MIB_ITEM("TCPFastOpenPassiveAltKey", LINUX_MIB_TCPFASTOPENPASSIVEALTKEY),
+	SNMP_MIB_ITEM("TcpTimeoutRehash", LINUX_MIB_TCPTIMEOUTREHASH),
+	SNMP_MIB_ITEM("TcpDuplicateDataRehash", LINUX_MIB_TCPDUPLICATEDATAREHASH),
+	SNMP_MIB_ITEM("TCPDSACKRecvSegs", LINUX_MIB_TCPDSACKRECVSEGS),
+	SNMP_MIB_ITEM("TCPDSACKIgnoredDubious", LINUX_MIB_TCPDSACKIGNOREDDUBIOUS),
 	SNMP_MIB_SENTINEL
 };
 
@@ -483,6 +488,7 @@
 					     offsetof(struct ipstats_mib, syncp)));
 
 	seq_putc(seq, '\n');
+	mptcp_seq_show(seq);
 	return 0;
 }
 
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 3183413..5d95f80 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -260,11 +260,12 @@
 		err = EHOSTUNREACH;
 		if (code > NR_ICMP_UNREACH)
 			break;
-		err = icmp_err_convert[code].errno;
-		harderr = icmp_err_convert[code].fatal;
 		if (code == ICMP_FRAG_NEEDED) {
 			harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
 			err = EMSGSIZE;
+		} else {
+			err = icmp_err_convert[code].errno;
+			harderr = icmp_err_convert[code].fatal;
 		}
 	}
 
@@ -478,7 +479,7 @@
 			skb->csum = csum_block_add(
 				skb->csum,
 				csum_partial_copy_nocheck(rfv->hdr.c + offset,
-							  to, copy, 0),
+							  to, copy),
 				odd);
 
 		odd = 0;
@@ -610,7 +611,7 @@
 	} else if (!ipc.oif) {
 		ipc.oif = inet->uc_index;
 	} else if (ipv4_is_lbcast(daddr) && inet->uc_index) {
-		/* oif is set, packet is to local broadcast and
+		/* oif is set, packet is to local broadcast
 		 * and uc_index is set. oif is most likely set
 		 * by sk_bound_dev_if. If uc_index != oif check if the
 		 * oif is an L3 master and uc_index is an L3 slave.
@@ -720,6 +721,7 @@
 	int ret = -EINVAL;
 	int chk_addr_ret;
 
+	lock_sock(sk);
 	if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
 		goto out;
 
@@ -739,7 +741,9 @@
 		inet->inet_saddr = 0;  /* Use device */
 	sk_dst_reset(sk);
 	ret = 0;
-out:	return ret;
+out:
+	release_sock(sk);
+	return ret;
 }
 
 /*
@@ -809,11 +813,11 @@
 	return 0;
 }
 
-static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
+static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen)
 {
 	if (optlen > sizeof(struct icmp_filter))
 		optlen = sizeof(struct icmp_filter);
-	if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
+	if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen))
 		return -EFAULT;
 	return 0;
 }
@@ -838,7 +842,7 @@
 }
 
 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			     sockptr_t optval, unsigned int optlen)
 {
 	if (optname == ICMP_FILTER) {
 		if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
@@ -850,23 +854,13 @@
 }
 
 static int raw_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	if (level != SOL_RAW)
 		return ip_setsockopt(sk, level, optname, optval, optlen);
 	return do_raw_setsockopt(sk, level, optname, optval, optlen);
 }
 
-#ifdef CONFIG_COMPAT
-static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
-				 char __user *optval, unsigned int optlen)
-{
-	if (level != SOL_RAW)
-		return compat_ip_setsockopt(sk, level, optname, optval, optlen);
-	return do_raw_setsockopt(sk, level, optname, optval, optlen);
-}
-#endif
-
 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
 			  char __user *optval, int __user *optlen)
 {
@@ -887,16 +881,6 @@
 	return do_raw_getsockopt(sk, level, optname, optval, optlen);
 }
 
-#ifdef CONFIG_COMPAT
-static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
-				 char __user *optval, int __user *optlen)
-{
-	if (level != SOL_RAW)
-		return compat_ip_getsockopt(sk, level, optname, optval, optlen);
-	return do_raw_getsockopt(sk, level, optname, optval, optlen);
-}
-#endif
-
 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
 {
 	switch (cmd) {
@@ -980,8 +964,6 @@
 	.usersize	   = sizeof_field(struct raw_sock, filter),
 	.h.raw_hash	   = &raw_v4_hashinfo,
 #ifdef CONFIG_COMPAT
-	.compat_setsockopt = compat_raw_setsockopt,
-	.compat_getsockopt = compat_raw_getsockopt,
 	.compat_ioctl	   = compat_raw_ioctl,
 #endif
 	.diag_destroy	   = raw_abort,
@@ -1034,6 +1016,7 @@
 }
 
 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(&h->lock)
 {
 	struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
 
@@ -1056,6 +1039,7 @@
 EXPORT_SYMBOL_GPL(raw_seq_next);
 
 void raw_seq_stop(struct seq_file *seq, void *v)
+	__releases(&h->lock)
 {
 	struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
 
diff --git a/net/ipv4/raw_diag.c b/net/ipv4/raw_diag.c
index a93e7d1..1b5b8af 100644
--- a/net/ipv4/raw_diag.c
+++ b/net/ipv4/raw_diag.c
@@ -87,15 +87,16 @@
 	return sk ? sk : ERR_PTR(-ENOENT);
 }
 
-static int raw_diag_dump_one(struct sk_buff *in_skb,
-			     const struct nlmsghdr *nlh,
+static int raw_diag_dump_one(struct netlink_callback *cb,
 			     const struct inet_diag_req_v2 *r)
 {
-	struct net *net = sock_net(in_skb->sk);
+	struct sk_buff *in_skb = cb->skb;
 	struct sk_buff *rep;
 	struct sock *sk;
+	struct net *net;
 	int err;
 
+	net = sock_net(in_skb->sk);
 	sk = raw_sock_get(net, r);
 	if (IS_ERR(sk))
 		return PTR_ERR(sk);
@@ -109,10 +110,7 @@
 		return -ENOMEM;
 	}
 
-	err = inet_sk_diag_fill(sk, NULL, rep, r,
-				sk_user_ns(NETLINK_CB(in_skb).sk),
-				NETLINK_CB(in_skb).portid,
-				nlh->nlmsg_seq, 0, nlh,
+	err = inet_sk_diag_fill(sk, NULL, rep, cb, r, 0,
 				netlink_net_capable(in_skb, CAP_NET_ADMIN));
 	sock_put(sk);
 
@@ -137,25 +135,25 @@
 	if (!inet_diag_bc_sk(bc, sk))
 		return 0;
 
-	return inet_sk_diag_fill(sk, NULL, skb, r,
-				 sk_user_ns(NETLINK_CB(cb->skb).sk),
-				 NETLINK_CB(cb->skb).portid,
-				 cb->nlh->nlmsg_seq, NLM_F_MULTI,
-				 cb->nlh, net_admin);
+	return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin);
 }
 
 static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
-			  const struct inet_diag_req_v2 *r, struct nlattr *bc)
+			  const struct inet_diag_req_v2 *r)
 {
 	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
 	struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
 	struct net *net = sock_net(skb->sk);
+	struct inet_diag_dump_data *cb_data;
 	int num, s_num, slot, s_slot;
 	struct sock *sk = NULL;
+	struct nlattr *bc;
 
 	if (IS_ERR(hashinfo))
 		return;
 
+	cb_data = cb->data;
+	bc = cb_data->inet_diag_nla_bc;
 	s_slot = cb->args[0];
 	num = s_num = cb->args[1];
 
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 5394929..ce787c3 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -238,11 +238,11 @@
 	return seq_open(file, &rt_cache_seq_ops);
 }
 
-static const struct file_operations rt_cache_seq_fops = {
-	.open	 = rt_cache_seq_open,
-	.read	 = seq_read,
-	.llseek	 = seq_lseek,
-	.release = seq_release,
+static const struct proc_ops rt_cache_proc_ops = {
+	.proc_open	= rt_cache_seq_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= seq_release,
 };
 
 
@@ -329,11 +329,11 @@
 	return seq_open(file, &rt_cpu_seq_ops);
 }
 
-static const struct file_operations rt_cpu_seq_fops = {
-	.open	 = rt_cpu_seq_open,
-	.read	 = seq_read,
-	.llseek	 = seq_lseek,
-	.release = seq_release,
+static const struct proc_ops rt_cpu_proc_ops = {
+	.proc_open	= rt_cpu_seq_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= seq_release,
 };
 
 #ifdef CONFIG_IP_ROUTE_CLASSID
@@ -367,12 +367,12 @@
 	struct proc_dir_entry *pde;
 
 	pde = proc_create("rt_cache", 0444, net->proc_net,
-			  &rt_cache_seq_fops);
+			  &rt_cache_proc_ops);
 	if (!pde)
 		goto err1;
 
 	pde = proc_create("rt_cache", 0444,
-			  net->proc_net_stat, &rt_cpu_seq_fops);
+			  net->proc_net_stat, &rt_cpu_proc_ops);
 	if (!pde)
 		goto err2;
 
@@ -631,14 +631,14 @@
 	kfree_rcu(oldest, rcu);
 }
 
-static inline u32 fnhe_hashfun(__be32 daddr)
+static u32 fnhe_hashfun(__be32 daddr)
 {
-	static u32 fnhe_hashrnd __read_mostly;
-	u32 hval;
+	static siphash_key_t fnhe_hash_key __read_mostly;
+	u64 hval;
 
-	net_get_random_once(&fnhe_hashrnd, sizeof(fnhe_hashrnd));
-	hval = jhash_1word((__force u32) daddr, fnhe_hashrnd);
-	return hash_32(hval, FNHE_HASH_SHIFT);
+	net_get_random_once(&fnhe_hash_key, sizeof(fnhe_hash_key));
+	hval = siphash_1u32((__force u32)daddr, &fnhe_hash_key);
+	return hash_64(hval, FNHE_HASH_SHIFT);
 }
 
 static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe)
@@ -1037,13 +1037,14 @@
 {
 	struct dst_entry *dst = &rt->dst;
 	struct net *net = dev_net(dst->dev);
-	u32 old_mtu = ipv4_mtu(dst);
 	struct fib_result res;
 	bool lock = false;
+	u32 old_mtu;
 
 	if (ip_mtu_locked(dst))
 		return;
 
+	old_mtu = ipv4_mtu(dst);
 	if (old_mtu < mtu)
 		return;
 
@@ -1076,13 +1077,18 @@
 	struct flowi4 fl4;
 
 	ip_rt_build_flow_key(&fl4, sk, skb);
+
+	/* Don't make lookup fail for bridged encapsulations */
+	if (skb && netif_is_any_bridge_port(skb->dev))
+		fl4.flowi4_oif = 0;
+
 	__ip_rt_update_pmtu(rt, &fl4, mtu);
 }
 
 void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu,
 		      int oif, u8 protocol)
 {
-	const struct iphdr *iph = (const struct iphdr *) skb->data;
+	const struct iphdr *iph = (const struct iphdr *)skb->data;
 	struct flowi4 fl4;
 	struct rtable *rt;
 	u32 mark = IP4_REPLY_MARK(net, skb->mark);
@@ -1099,7 +1105,7 @@
 
 static void __ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu)
 {
-	const struct iphdr *iph = (const struct iphdr *) skb->data;
+	const struct iphdr *iph = (const struct iphdr *)skb->data;
 	struct flowi4 fl4;
 	struct rtable *rt;
 
@@ -1117,7 +1123,7 @@
 
 void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu)
 {
-	const struct iphdr *iph = (const struct iphdr *) skb->data;
+	const struct iphdr *iph = (const struct iphdr *)skb->data;
 	struct flowi4 fl4;
 	struct rtable *rt;
 	struct dst_entry *odst = NULL;
@@ -1147,7 +1153,7 @@
 		new = true;
 	}
 
-	__ip_rt_update_pmtu((struct rtable *) xfrm_dst_path(&rt->dst), &fl4, mtu);
+	__ip_rt_update_pmtu((struct rtable *)xfrm_dst_path(&rt->dst), &fl4, mtu);
 
 	if (!dst_check(&rt->dst, 0)) {
 		if (new)
@@ -1172,7 +1178,7 @@
 void ipv4_redirect(struct sk_buff *skb, struct net *net,
 		   int oif, u8 protocol)
 {
-	const struct iphdr *iph = (const struct iphdr *) skb->data;
+	const struct iphdr *iph = (const struct iphdr *)skb->data;
 	struct flowi4 fl4;
 	struct rtable *rt;
 
@@ -1188,7 +1194,7 @@
 
 void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk)
 {
-	const struct iphdr *iph = (const struct iphdr *) skb->data;
+	const struct iphdr *iph = (const struct iphdr *)skb->data;
 	struct flowi4 fl4;
 	struct rtable *rt;
 	struct net *net = sock_net(sk);
@@ -1328,7 +1334,7 @@
 
 static unsigned int ipv4_mtu(const struct dst_entry *dst)
 {
-	const struct rtable *rt = (const struct rtable *) dst;
+	const struct rtable *rt = (const struct rtable *)dst;
 	unsigned int mtu = rt->rt_pmtu;
 
 	if (!mtu || time_after_eq(jiffies, rt->dst.expires))
@@ -1646,12 +1652,11 @@
 
 struct rtable *rt_dst_alloc(struct net_device *dev,
 			    unsigned int flags, u16 type,
-			    bool nopolicy, bool noxfrm, bool will_cache)
+			    bool nopolicy, bool noxfrm)
 {
 	struct rtable *rt;
 
 	rt = dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK,
-		       (will_cache ? 0 : DST_HOST) |
 		       (nopolicy ? DST_NOPOLICY : 0) |
 		       (noxfrm ? DST_NOXFRM : 0));
 
@@ -1699,7 +1704,6 @@
 			new_rt->rt_gw6 = rt->rt_gw6;
 		INIT_LIST_HEAD(&new_rt->rt_uncached);
 
-		new_rt->dst.flags |= DST_HOST;
 		new_rt->dst.input = rt->dst.input;
 		new_rt->dst.output = rt->dst.output;
 		new_rt->dst.error = rt->dst.error;
@@ -1759,7 +1763,7 @@
 		flags |= RTCF_LOCAL;
 
 	rth = rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST,
-			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false);
+			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false);
 	if (!rth)
 		return -ENOBUFS;
 
@@ -1876,7 +1880,7 @@
 
 	rth = rt_dst_alloc(out_dev->dev, 0, res->type,
 			   IN_DEV_CONF_GET(in_dev, NOPOLICY),
-			   IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache);
+			   IN_DEV_CONF_GET(out_dev, NOXFRM));
 	if (!rth) {
 		err = -ENOBUFS;
 		goto cleanup;
@@ -1922,10 +1926,7 @@
 	if (!icmph)
 		goto out;
 
-	if (icmph->type != ICMP_DEST_UNREACH &&
-	    icmph->type != ICMP_REDIRECT &&
-	    icmph->type != ICMP_TIME_EXCEEDED &&
-	    icmph->type != ICMP_PARAMETERPROB)
+	if (!icmp_is_err(icmph->type))
 		goto out;
 
 	inner_iph = skb_header_pointer(skb,
@@ -2050,10 +2051,65 @@
 	return __mkroute_input(skb, res, in_dev, daddr, saddr, tos);
 }
 
+/* Implements all the saddr-related checks as ip_route_input_slow(),
+ * assuming daddr is valid and the destination is not a local broadcast one.
+ * Uses the provided hint instead of performing a route lookup.
+ */
+int ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr,
+		      u8 tos, struct net_device *dev,
+		      const struct sk_buff *hint)
+{
+	struct in_device *in_dev = __in_dev_get_rcu(dev);
+	struct rtable *rt = skb_rtable(hint);
+	struct net *net = dev_net(dev);
+	int err = -EINVAL;
+	u32 tag = 0;
+
+	if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr))
+		goto martian_source;
+
+	if (ipv4_is_zeronet(saddr))
+		goto martian_source;
+
+	if (ipv4_is_loopback(saddr) && !IN_DEV_NET_ROUTE_LOCALNET(in_dev, net))
+		goto martian_source;
+
+	if (rt->rt_type != RTN_LOCAL)
+		goto skip_validate_source;
+
+	tos &= IPTOS_RT_MASK;
+	err = fib_validate_source(skb, saddr, daddr, tos, 0, dev, in_dev, &tag);
+	if (err < 0)
+		goto martian_source;
+
+skip_validate_source:
+	skb_dst_copy(skb, hint);
+	return 0;
+
+martian_source:
+	ip_handle_martian_source(dev, in_dev, skb, daddr, saddr);
+	return err;
+}
+
+/* get device for dst_alloc with local routes */
+static struct net_device *ip_rt_get_dev(struct net *net,
+					const struct fib_result *res)
+{
+	struct fib_nh_common *nhc = res->fi ? res->nhc : NULL;
+	struct net_device *dev = NULL;
+
+	if (nhc)
+		dev = l3mdev_master_dev_rcu(nhc->nhc_dev);
+
+	return dev ? : net->loopback_dev;
+}
+
 /*
  *	NOTE. We drop all the packets that has local source
  *	addresses, because every properly looped back packet
  *	must have correct destination already attached by output routine.
+ *	Changes in the enforced policies must be applied also to
+ *	ip_route_use_hint().
  *
  *	Such approach solves two big problems:
  *	1. Not simplex devices are handled properly.
@@ -2204,9 +2260,9 @@
 		}
 	}
 
-	rth = rt_dst_alloc(l3mdev_master_dev_rcu(dev) ? : net->loopback_dev,
+	rth = rt_dst_alloc(ip_rt_get_dev(net, res),
 			   flags | RTCF_LOCAL, res->type,
-			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache);
+			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false);
 	if (!rth)
 		goto e_nobufs;
 
@@ -2430,8 +2486,7 @@
 add:
 	rth = rt_dst_alloc(dev_out, flags, type,
 			   IN_DEV_CONF_GET(in_dev, NOPOLICY),
-			   IN_DEV_CONF_GET(in_dev, NOXFRM),
-			   do_cache);
+			   IN_DEV_CONF_GET(in_dev, NOXFRM));
 	if (!rth)
 		return ERR_PTR(-ENOBUFS);
 
@@ -2662,44 +2717,15 @@
 	return rth;
 }
 
-static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie)
-{
-	return NULL;
-}
-
-static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst)
-{
-	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
-
-	return mtu ? : dst->dev->mtu;
-}
-
-static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
-					  struct sk_buff *skb, u32 mtu,
-					  bool confirm_neigh)
-{
-}
-
-static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
-				       struct sk_buff *skb)
-{
-}
-
-static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst,
-					  unsigned long old)
-{
-	return NULL;
-}
-
 static struct dst_ops ipv4_dst_blackhole_ops = {
-	.family			=	AF_INET,
-	.check			=	ipv4_blackhole_dst_check,
-	.mtu			=	ipv4_blackhole_mtu,
-	.default_advmss		=	ipv4_default_advmss,
-	.update_pmtu		=	ipv4_rt_blackhole_update_pmtu,
-	.redirect		=	ipv4_rt_blackhole_redirect,
-	.cow_metrics		=	ipv4_rt_blackhole_cow_metrics,
-	.neigh_lookup		=	ipv4_neigh_lookup,
+	.family			= AF_INET,
+	.default_advmss		= ipv4_default_advmss,
+	.neigh_lookup		= ipv4_neigh_lookup,
+	.check			= dst_blackhole_check,
+	.cow_metrics		= dst_blackhole_cow_metrics,
+	.update_pmtu		= dst_blackhole_update_pmtu,
+	.redirect		= dst_blackhole_redirect,
+	.mtu			= dst_blackhole_mtu,
 };
 
 struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig)
@@ -2761,6 +2787,54 @@
 }
 EXPORT_SYMBOL_GPL(ip_route_output_flow);
 
+struct rtable *ip_route_output_tunnel(struct sk_buff *skb,
+				      struct net_device *dev,
+				      struct net *net, __be32 *saddr,
+				      const struct ip_tunnel_info *info,
+				      u8 protocol, bool use_cache)
+{
+#ifdef CONFIG_DST_CACHE
+	struct dst_cache *dst_cache;
+#endif
+	struct rtable *rt = NULL;
+	struct flowi4 fl4;
+	__u8 tos;
+
+#ifdef CONFIG_DST_CACHE
+	dst_cache = (struct dst_cache *)&info->dst_cache;
+	if (use_cache) {
+		rt = dst_cache_get_ip4(dst_cache, saddr);
+		if (rt)
+			return rt;
+	}
+#endif
+	memset(&fl4, 0, sizeof(fl4));
+	fl4.flowi4_mark = skb->mark;
+	fl4.flowi4_proto = protocol;
+	fl4.daddr = info->key.u.ipv4.dst;
+	fl4.saddr = info->key.u.ipv4.src;
+	tos = info->key.tos;
+	fl4.flowi4_tos = RT_TOS(tos);
+
+	rt = ip_route_output_key(net, &fl4);
+	if (IS_ERR(rt)) {
+		netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr);
+		return ERR_PTR(-ENETUNREACH);
+	}
+	if (rt->dst.dev == dev) { /* is this necessary? */
+		netdev_dbg(dev, "circular route to %pI4\n", &fl4.daddr);
+		ip_rt_put(rt);
+		return ERR_PTR(-ELOOP);
+	}
+#ifdef CONFIG_DST_CACHE
+	if (use_cache)
+		dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
+#endif
+	*saddr = fl4.saddr;
+	return rt;
+}
+EXPORT_SYMBOL_GPL(ip_route_output_tunnel);
+
 /* called with rcu_read_lock held */
 static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
 			struct rtable *rt, u32 table_id, struct flowi4 *fl4,
@@ -3212,16 +3286,41 @@
 	skb_reset_mac_header(skb);
 
 	if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
+		struct fib_rt_info fri;
+
 		if (!res.fi) {
 			err = fib_props[res.type].error;
 			if (!err)
 				err = -EHOSTUNREACH;
 			goto errout_rcu;
 		}
+		fri.fi = res.fi;
+		fri.tb_id = table_id;
+		fri.dst = res.prefix;
+		fri.dst_len = res.prefixlen;
+		fri.tos = fl4.flowi4_tos;
+		fri.type = rt->rt_type;
+		fri.offload = 0;
+		fri.trap = 0;
+		if (res.fa_head) {
+			struct fib_alias *fa;
+
+			hlist_for_each_entry_rcu(fa, res.fa_head, fa_list) {
+				u8 slen = 32 - fri.dst_len;
+
+				if (fa->fa_slen == slen &&
+				    fa->tb_id == fri.tb_id &&
+				    fa->fa_tos == fri.tos &&
+				    fa->fa_info == res.fi &&
+				    fa->fa_type == fri.type) {
+					fri.offload = fa->offload;
+					fri.trap = fa->trap;
+					break;
+				}
+			}
+		}
 		err = fib_dump_info(skb, NETLINK_CB(in_skb).portid,
-				    nlh->nlmsg_seq, RTM_NEWROUTE, table_id,
-				    rt->rt_type, res.prefix, res.prefixlen,
-				    fl4.flowi4_tos, res.fi, 0);
+				    nlh->nlmsg_seq, RTM_NEWROUTE, &fri, 0);
 	} else {
 		err = rt_fill_info(net, dst, src, rt, table_id, &fl4, skb,
 				   NETLINK_CB(in_skb).portid,
@@ -3254,8 +3353,7 @@
 static int ip_min_valid_pmtu __read_mostly	= IPV4_MIN_MTU;
 
 static int ipv4_sysctl_rtcache_flush(struct ctl_table *__ctl, int write,
-					void __user *buffer,
-					size_t *lenp, loff_t *ppos)
+		void *buffer, size_t *lenp, loff_t *ppos)
 {
 	struct net *net = (struct net *)__ctl->extra1;
 
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 2b45d14..00dc3f9 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -62,10 +62,10 @@
  * Since subsequent timestamps use the normal tcp_time_stamp value, we
  * must make sure that the resulting initial timestamp is <= tcp_time_stamp.
  */
-u64 cookie_init_timestamp(struct request_sock *req)
+u64 cookie_init_timestamp(struct request_sock *req, u64 now)
 {
 	struct inet_request_sock *ireq;
-	u32 ts, ts_now = tcp_time_stamp_raw();
+	u32 ts, ts_now = tcp_ns_to_ts(now);
 	u32 options = 0;
 
 	ireq = inet_rsk(req);
@@ -212,6 +212,12 @@
 		refcount_set(&req->rsk_refcnt, 1);
 		tcp_sk(child)->tsoffset = tsoff;
 		sock_rps_save_rxhash(child, skb);
+
+		if (rsk_drop_req(req)) {
+			reqsk_put(req);
+			return child;
+		}
+
 		if (inet_csk_reqsk_queue_add(sk, req, child))
 			return child;
 
@@ -276,6 +282,40 @@
 }
 EXPORT_SYMBOL(cookie_ecn_ok);
 
+struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops,
+					    struct sock *sk,
+					    struct sk_buff *skb)
+{
+	struct tcp_request_sock *treq;
+	struct request_sock *req;
+
+#ifdef CONFIG_MPTCP
+	if (sk_is_mptcp(sk))
+		ops = &mptcp_subflow_request_sock_ops;
+#endif
+
+	req = inet_reqsk_alloc(ops, sk, false);
+	if (!req)
+		return NULL;
+
+	treq = tcp_rsk(req);
+	treq->syn_tos = TCP_SKB_CB(skb)->ip_dsfield;
+#if IS_ENABLED(CONFIG_MPTCP)
+	treq->is_mptcp = sk_is_mptcp(sk);
+	if (treq->is_mptcp) {
+		int err = mptcp_subflow_init_cookie_req(req, sk, skb);
+
+		if (err) {
+			reqsk_free(req);
+			return NULL;
+		}
+	}
+#endif
+
+	return req;
+}
+EXPORT_SYMBOL_GPL(cookie_tcp_reqsk_alloc);
+
 /* On input, sk is a listener.
  * Output is listener if incoming packet would not create a child
  *           NULL if memory could not be allocated.
@@ -326,7 +366,7 @@
 		goto out;
 
 	ret = NULL;
-	req = inet_reqsk_alloc(&tcp_request_sock_ops, sk, false); /* for safety */
+	req = cookie_tcp_reqsk_alloc(&tcp_request_sock_ops, sk, skb);
 	if (!req)
 		goto out;
 
@@ -349,6 +389,7 @@
 	req->ts_recent		= tcp_opt.saw_tstamp ? tcp_opt.rcv_tsval : 0;
 	treq->snt_synack	= 0;
 	treq->tfo_listener	= false;
+
 	if (IS_ENABLED(CONFIG_SMC))
 		ireq->smc_ok = 0;
 
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index c83a5d0..0882980 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -71,8 +71,7 @@
 
 /* Validate changes from /proc interface. */
 static int ipv4_local_port_range(struct ctl_table *table, int write,
-				 void __user *buffer,
-				 size_t *lenp, loff_t *ppos)
+				 void *buffer, size_t *lenp, loff_t *ppos)
 {
 	struct net *net =
 		container_of(table->data, struct net, ipv4.ip_local_ports.range);
@@ -107,7 +106,7 @@
 
 /* Validate changes from /proc interface. */
 static int ipv4_privileged_ports(struct ctl_table *table, int write,
-				void __user *buffer, size_t *lenp, loff_t *ppos)
+				void *buffer, size_t *lenp, loff_t *ppos)
 {
 	struct net *net = container_of(table->data, struct net,
 	    ipv4.sysctl_ip_prot_sock);
@@ -168,8 +167,7 @@
 
 /* Validate changes from /proc interface. */
 static int ipv4_ping_group_range(struct ctl_table *table, int write,
-				 void __user *buffer,
-				 size_t *lenp, loff_t *ppos)
+				 void *buffer, size_t *lenp, loff_t *ppos)
 {
 	struct user_namespace *user_ns = current_user_ns();
 	int ret;
@@ -204,8 +202,7 @@
 }
 
 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
-				    void __user *buffer,
-				    size_t *lenp, loff_t *ppos)
+				    void *buffer, size_t *lenp, loff_t *ppos)
 {
 	struct net *net;
 	int ret;
@@ -221,7 +218,7 @@
 }
 
 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
-				       void __user *buffer, size_t *lenp, loff_t *ppos)
+				       void *buffer, size_t *lenp, loff_t *ppos)
 {
 	struct net *net = container_of(ctl->data, struct net,
 				       ipv4.tcp_congestion_control);
@@ -241,9 +238,8 @@
 }
 
 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
-						 int write,
-						 void __user *buffer, size_t *lenp,
-						 loff_t *ppos)
+						 int write, void *buffer,
+						 size_t *lenp, loff_t *ppos)
 {
 	struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 	int ret;
@@ -258,9 +254,8 @@
 }
 
 static int proc_allowed_congestion_control(struct ctl_table *ctl,
-					   int write,
-					   void __user *buffer, size_t *lenp,
-					   loff_t *ppos)
+					   int write, void *buffer,
+					   size_t *lenp, loff_t *ppos)
 {
 	struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 	int ret;
@@ -296,8 +291,7 @@
 }
 
 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
-				 void __user *buffer, size_t *lenp,
-				 loff_t *ppos)
+				 void *buffer, size_t *lenp, loff_t *ppos)
 {
 	struct net *net = container_of(table->data, struct net,
 	    ipv4.sysctl_tcp_fastopen);
@@ -332,6 +326,10 @@
 				user_key[i * 4 + 1],
 				user_key[i * 4 + 2],
 				user_key[i * 4 + 3]);
+
+		if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
+			break;
+
 		if (i + 1 < n_keys)
 			off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 	}
@@ -387,7 +385,7 @@
 }
 
 static int proc_tcp_early_demux(struct ctl_table *table, int write,
-				void __user *buffer, size_t *lenp, loff_t *ppos)
+				void *buffer, size_t *lenp, loff_t *ppos)
 {
 	int ret = 0;
 
@@ -403,7 +401,7 @@
 }
 
 static int proc_udp_early_demux(struct ctl_table *table, int write,
-				void __user *buffer, size_t *lenp, loff_t *ppos)
+				void *buffer, size_t *lenp, loff_t *ppos)
 {
 	int ret = 0;
 
@@ -419,8 +417,7 @@
 }
 
 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
-					     int write,
-					     void __user *buffer,
+					     int write, void *buffer,
 					     size_t *lenp, loff_t *ppos)
 {
 	struct net *net = container_of(table->data, struct net,
@@ -435,8 +432,7 @@
 }
 
 static int proc_tcp_available_ulp(struct ctl_table *ctl,
-				  int write,
-				  void __user *buffer, size_t *lenp,
+				  int write, void *buffer, size_t *lenp,
 				  loff_t *ppos)
 {
 	struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
@@ -454,7 +450,7 @@
 
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
-					  void __user *buffer, size_t *lenp,
+					  void *buffer, size_t *lenp,
 					  loff_t *ppos)
 {
 	struct net *net = container_of(table->data, struct net,
@@ -543,18 +539,6 @@
 	},
 #endif /* CONFIG_NETLABEL */
 	{
-		.procname	= "tcp_available_congestion_control",
-		.maxlen		= TCP_CA_BUF_MAX,
-		.mode		= 0444,
-		.proc_handler   = proc_tcp_available_congestion_control,
-	},
-	{
-		.procname	= "tcp_allowed_congestion_control",
-		.maxlen		= TCP_CA_BUF_MAX,
-		.mode		= 0644,
-		.proc_handler   = proc_allowed_congestion_control,
-	},
-	{
 		.procname	= "tcp_available_ulp",
 		.maxlen		= TCP_ULP_BUF_MAX,
 		.mode		= 0444,
@@ -711,6 +695,15 @@
 		.proc_handler   = proc_tcp_early_demux
 	},
 	{
+		.procname       = "nexthop_compat_mode",
+		.data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
+		.maxlen         = sizeof(int),
+		.mode           = 0644,
+		.proc_handler   = proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
+	{
 		.procname	= "ip_default_ttl",
 		.data		= &init_net.ipv4.sysctl_ip_default_ttl,
 		.maxlen		= sizeof(int),
@@ -764,6 +757,15 @@
 		.proc_handler	= proc_dointvec
 	},
 	{
+		.procname	= "ip_autobind_reuse",
+		.data		= &init_net.ipv4.sysctl_ip_autobind_reuse,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1         = SYSCTL_ZERO,
+		.extra2         = SYSCTL_ONE,
+	},
+	{
 		.procname	= "fwmark_reflect",
 		.data		= &init_net.ipv4.sysctl_fwmark_reflect,
 		.maxlen		= sizeof(int),
@@ -874,6 +876,18 @@
 		.proc_handler	= proc_tcp_congestion_control,
 	},
 	{
+		.procname	= "tcp_available_congestion_control",
+		.maxlen		= TCP_CA_BUF_MAX,
+		.mode		= 0444,
+		.proc_handler   = proc_tcp_available_congestion_control,
+	},
+	{
+		.procname	= "tcp_allowed_congestion_control",
+		.maxlen		= TCP_CA_BUF_MAX,
+		.mode		= 0644,
+		.proc_handler   = proc_allowed_congestion_control,
+	},
+	{
 		.procname	= "tcp_keepalive_time",
 		.data		= &init_net.ipv4.sysctl_tcp_keepalive_time,
 		.maxlen		= sizeof(int),
@@ -1181,6 +1195,15 @@
 		.proc_handler	= proc_dointvec,
 	},
 	{
+		.procname	= "tcp_no_ssthresh_metrics_save",
+		.data		= &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
+	{
 		.procname	= "tcp_moderate_rcvbuf",
 		.data		= &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
 		.maxlen		= sizeof(int),
@@ -1291,6 +1314,13 @@
 		.proc_handler	= proc_doulongvec_minmax,
 	},
 	{
+		.procname	= "tcp_comp_sack_slack_ns",
+		.data		= &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
+		.maxlen		= sizeof(unsigned long),
+		.mode		= 0644,
+		.proc_handler	= proc_doulongvec_minmax,
+	},
+	{
 		.procname	= "tcp_comp_sack_nr",
 		.data		= &init_net.ipv4.sysctl_tcp_comp_sack_nr,
 		.maxlen		= sizeof(int),
@@ -1300,6 +1330,15 @@
 		.extra2		= &comp_sack_nr_max,
 	},
 	{
+		.procname       = "tcp_reflect_tos",
+		.data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
+		.maxlen         = sizeof(int),
+		.mode           = 0644,
+		.proc_handler   = proc_dointvec_minmax,
+		.extra1         = SYSCTL_ZERO,
+		.extra2         = SYSCTL_ONE,
+	},
+	{
 		.procname	= "udp_rmem_min",
 		.data		= &init_net.ipv4.sysctl_udp_rmem_min,
 		.maxlen		= sizeof(init_net.ipv4.sysctl_udp_rmem_min),
@@ -1330,9 +1369,19 @@
 		if (!table)
 			goto err_alloc;
 
-		/* Update the variables to point into the current struct net */
-		for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
-			table[i].data += (void *)net - (void *)&init_net;
+		for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
+			if (table[i].data) {
+				/* Update the variables to point into
+				 * the current struct net
+				 */
+				table[i].data += (void *)net - (void *)&init_net;
+			} else {
+				/* Entries without data pointer are global;
+				 * Make them read-only in non-init_net ns
+				 */
+				table[i].mode &= ~0222;
+			}
+		}
 	}
 
 	net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 5c8d0fb..a3ec2a0 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -271,6 +271,7 @@
 #include <net/icmp.h>
 #include <net/inet_common.h>
 #include <net/tcp.h>
+#include <net/mptcp.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
 #include <net/sock.h>
@@ -279,8 +280,8 @@
 #include <asm/ioctls.h>
 #include <net/busy_poll.h>
 
-struct percpu_counter tcp_orphan_count;
-EXPORT_SYMBOL_GPL(tcp_orphan_count);
+DEFINE_PER_CPU(unsigned int, tcp_orphan_count);
+EXPORT_PER_CPU_SYMBOL_GPL(tcp_orphan_count);
 
 long sysctl_tcp_mem[3] __read_mostly;
 EXPORT_SYMBOL(sysctl_tcp_mem);
@@ -417,6 +418,8 @@
 	INIT_LIST_HEAD(&tp->tsorted_sent_queue);
 
 	icsk->icsk_rto = TCP_TIMEOUT_INIT;
+	icsk->icsk_rto_min = TCP_RTO_MIN;
+	icsk->icsk_delack_max = TCP_DELACK_MAX;
 	tp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT);
 	minmax_reset(&tp->rtt_min, tcp_jiffies32, ~0U);
 
@@ -443,8 +446,6 @@
 	tp->tsoffset = 0;
 	tp->rack.reo_wnd_steps = 1;
 
-	sk->sk_state = TCP_CLOSE;
-
 	sk->sk_write_space = sk_stream_write_space;
 	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
 
@@ -565,7 +566,7 @@
 			mask |= EPOLLIN | EPOLLRDNORM;
 
 		if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
-			if (sk_stream_is_writeable(sk)) {
+			if (__sk_stream_is_writeable(sk, 1)) {
 				mask |= EPOLLOUT | EPOLLWRNORM;
 			} else {  /* send SIGIO later */
 				sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
@@ -577,7 +578,7 @@
 				 * pairs with the input side.
 				 */
 				smp_mb__after_atomic();
-				if (sk_stream_is_writeable(sk))
+				if (__sk_stream_is_writeable(sk, 1))
 					mask |= EPOLLOUT | EPOLLWRNORM;
 			}
 		} else
@@ -702,8 +703,8 @@
 	       refcount_read(&sk->sk_wmem_alloc) > skb->truesize;
 }
 
-static void tcp_push(struct sock *sk, int flags, int mss_now,
-		     int nonagle, int size_goal)
+void tcp_push(struct sock *sk, int flags, int mss_now,
+	      int nonagle, int size_goal)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct sk_buff *skb;
@@ -937,7 +938,7 @@
 	return max(size_goal, mss_now);
 }
 
-static int tcp_send_mss(struct sock *sk, int *size_goal, int flags)
+int tcp_send_mss(struct sock *sk, int *size_goal, int flags)
 {
 	int mss_now;
 
@@ -955,7 +956,7 @@
  */
 static void tcp_remove_empty_skb(struct sock *sk, struct sk_buff *skb)
 {
-	if (skb && !skb->len) {
+	if (skb && TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq) {
 		tcp_unlink_write_queue(skb, sk);
 		if (tcp_write_queue_empty(sk))
 			tcp_chrono_stop(sk, TCP_CHRONO_BUSY);
@@ -1006,12 +1007,12 @@
 		    !tcp_skb_can_collapse_to(skb)) {
 new_segment:
 			if (!sk_stream_memory_free(sk))
-				goto wait_for_sndbuf;
+				goto wait_for_space;
 
 			skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation,
 					tcp_rtx_and_write_queues_empty(sk));
 			if (!skb)
-				goto wait_for_memory;
+				goto wait_for_space;
 
 #ifdef CONFIG_TLS_DEVICE
 			skb->decrypted = !!(flags & MSG_SENDPAGE_DECRYPTED);
@@ -1030,7 +1031,7 @@
 			goto new_segment;
 		}
 		if (!sk_wmem_schedule(sk, copy))
-			goto wait_for_memory;
+			goto wait_for_space;
 
 		if (can_coalesce) {
 			skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
@@ -1071,9 +1072,8 @@
 			tcp_push_one(sk, mss_now);
 		continue;
 
-wait_for_sndbuf:
+wait_for_space:
 		set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
-wait_for_memory:
 		tcp_push(sk, flags & ~MSG_MORE, mss_now,
 			 TCP_NAGLE_PUSH, size_goal);
 
@@ -1284,7 +1284,7 @@
 
 new_segment:
 			if (!sk_stream_memory_free(sk))
-				goto wait_for_sndbuf;
+				goto wait_for_space;
 
 			if (unlikely(process_backlog >= 16)) {
 				process_backlog = 0;
@@ -1295,7 +1295,7 @@
 			skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation,
 						  first_skb);
 			if (!skb)
-				goto wait_for_memory;
+				goto wait_for_space;
 
 			process_backlog++;
 			skb->ip_summed = CHECKSUM_PARTIAL;
@@ -1328,7 +1328,7 @@
 			struct page_frag *pfrag = sk_page_frag(sk);
 
 			if (!sk_page_frag_refill(sk, pfrag))
-				goto wait_for_memory;
+				goto wait_for_space;
 
 			if (!skb_can_coalesce(skb, i, pfrag->page,
 					      pfrag->offset)) {
@@ -1342,7 +1342,7 @@
 			copy = min_t(int, copy, pfrag->size - pfrag->offset);
 
 			if (!sk_wmem_schedule(sk, copy))
-				goto wait_for_memory;
+				goto wait_for_space;
 
 			err = skb_copy_to_page_nocache(sk, &msg->msg_iter, skb,
 						       pfrag->page,
@@ -1361,6 +1361,9 @@
 			}
 			pfrag->offset += copy;
 		} else {
+			if (!sk_wmem_schedule(sk, copy))
+				goto wait_for_space;
+
 			err = skb_zerocopy_iter_stream(sk, skb, msg, copy, uarg);
 			if (err == -EMSGSIZE || err == -EEXIST) {
 				tcp_mark_push(tp, skb);
@@ -1395,9 +1398,8 @@
 			tcp_push_one(sk, mss_now);
 		continue;
 
-wait_for_sndbuf:
+wait_for_space:
 		set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
-wait_for_memory:
 		if (copied)
 			tcp_push(sk, flags & ~MSG_MORE, mss_now,
 				 TCP_NAGLE_PUSH, size_goal);
@@ -1529,7 +1531,7 @@
  * calculation of whether or not we must ACK for the sake of
  * a window update.
  */
-static void tcp_cleanup_rbuf(struct sock *sk, int copied)
+void tcp_cleanup_rbuf(struct sock *sk, int copied)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	bool time_to_ack = false;
@@ -1542,10 +1544,8 @@
 
 	if (inet_csk_ack_scheduled(sk)) {
 		const struct inet_connection_sock *icsk = inet_csk(sk);
-		   /* Delayed ACKs frequently hit locked sockets during bulk
-		    * receive. */
-		if (icsk->icsk_ack.blocked ||
-		    /* Once-per-two-segments ACK was not sent by tcp_input.c */
+
+		if (/* Once-per-two-segments ACK was not sent by tcp_input.c */
 		    tp->rcv_nxt - tp->rcv_wup > icsk->icsk_ack.rcv_mss ||
 		    /*
 		     * If this read emptied read buffer, we send ACK, if
@@ -1652,11 +1652,13 @@
 				if (!copied)
 					copied = used;
 				break;
-			} else if (used <= len) {
-				seq += used;
-				copied += used;
-				offset += used;
 			}
+			if (WARN_ON_ONCE(used > len))
+				used = len;
+			seq += used;
+			copied += used;
+			offset += used;
+
 			/* If recv_actor drops the lock (e.g. TCP splice
 			 * receive) the skb pointer might be invalid when
 			 * getting here: tcp_collapse might have deleted it
@@ -1738,7 +1740,7 @@
 		return -EPERM;
 	vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC);
 
-	/* Instruct vm_insert_page() to not down_read(mmap_sem) */
+	/* Instruct vm_insert_page() to not mmap_read_lock(mm) */
 	vma->vm_flags |= VM_MIXEDMAP;
 
 	vma->vm_ops = &tcp_vm_ops;
@@ -1746,18 +1748,127 @@
 }
 EXPORT_SYMBOL(tcp_mmap);
 
+static skb_frag_t *skb_advance_to_frag(struct sk_buff *skb, u32 offset_skb,
+				       u32 *offset_frag)
+{
+	skb_frag_t *frag;
+
+	if (unlikely(offset_skb >= skb->len))
+		return NULL;
+
+	offset_skb -= skb_headlen(skb);
+	if ((int)offset_skb < 0 || skb_has_frag_list(skb))
+		return NULL;
+
+	frag = skb_shinfo(skb)->frags;
+	while (offset_skb) {
+		if (skb_frag_size(frag) > offset_skb) {
+			*offset_frag = offset_skb;
+			return frag;
+		}
+		offset_skb -= skb_frag_size(frag);
+		++frag;
+	}
+	*offset_frag = 0;
+	return frag;
+}
+
+static int tcp_copy_straggler_data(struct tcp_zerocopy_receive *zc,
+				   struct sk_buff *skb, u32 copylen,
+				   u32 *offset, u32 *seq)
+{
+	unsigned long copy_address = (unsigned long)zc->copybuf_address;
+	struct msghdr msg = {};
+	struct iovec iov;
+	int err;
+
+	if (copy_address != zc->copybuf_address)
+		return -EINVAL;
+
+	err = import_single_range(READ, (void __user *)copy_address,
+				  copylen, &iov, &msg.msg_iter);
+	if (err)
+		return err;
+	err = skb_copy_datagram_msg(skb, *offset, &msg, copylen);
+	if (err)
+		return err;
+	zc->recv_skip_hint -= copylen;
+	*offset += copylen;
+	*seq += copylen;
+	return (__s32)copylen;
+}
+
+static int tcp_zerocopy_handle_leftover_data(struct tcp_zerocopy_receive *zc,
+					     struct sock *sk,
+					     struct sk_buff *skb,
+					     u32 *seq,
+					     s32 copybuf_len)
+{
+	u32 offset, copylen = min_t(u32, copybuf_len, zc->recv_skip_hint);
+
+	if (!copylen)
+		return 0;
+	/* skb is null if inq < PAGE_SIZE. */
+	if (skb)
+		offset = *seq - TCP_SKB_CB(skb)->seq;
+	else
+		skb = tcp_recv_skb(sk, *seq, &offset);
+
+	zc->copybuf_len = tcp_copy_straggler_data(zc, skb, copylen, &offset,
+						  seq);
+	return zc->copybuf_len < 0 ? 0 : copylen;
+}
+
+static int tcp_zerocopy_vm_insert_batch(struct vm_area_struct *vma,
+					struct page **pages,
+					unsigned long pages_to_map,
+					unsigned long *insert_addr,
+					u32 *length_with_pending,
+					u32 *seq,
+					struct tcp_zerocopy_receive *zc)
+{
+	unsigned long pages_remaining = pages_to_map;
+	int bytes_mapped;
+	int ret;
+
+	ret = vm_insert_pages(vma, *insert_addr, pages, &pages_remaining);
+	bytes_mapped = PAGE_SIZE * (pages_to_map - pages_remaining);
+	/* Even if vm_insert_pages fails, it may have partially succeeded in
+	 * mapping (some but not all of the pages).
+	 */
+	*seq += bytes_mapped;
+	*insert_addr += bytes_mapped;
+	if (ret) {
+		/* But if vm_insert_pages did fail, we have to unroll some state
+		 * we speculatively touched before.
+		 */
+		const int bytes_not_mapped = PAGE_SIZE * pages_remaining;
+		*length_with_pending -= bytes_not_mapped;
+		zc->recv_skip_hint += bytes_not_mapped;
+	}
+	return ret;
+}
+
 static int tcp_zerocopy_receive(struct sock *sk,
 				struct tcp_zerocopy_receive *zc)
 {
+	u32 length = 0, offset, vma_len, avail_len, aligned_len, copylen = 0;
 	unsigned long address = (unsigned long)zc->address;
+	s32 copybuf_len = zc->copybuf_len;
+	struct tcp_sock *tp = tcp_sk(sk);
+	#define PAGE_BATCH_SIZE 8
+	struct page *pages[PAGE_BATCH_SIZE];
 	const skb_frag_t *frags = NULL;
-	u32 length = 0, seq, offset;
 	struct vm_area_struct *vma;
 	struct sk_buff *skb = NULL;
-	struct tcp_sock *tp;
-	int inq;
+	unsigned long pg_idx = 0;
+	unsigned long curr_addr;
+	u32 seq = tp->copied_seq;
+	int inq = tcp_inq(sk);
 	int ret;
 
+	zc->copybuf_len = 0;
+
 	if (address & (PAGE_SIZE - 1) || address != zc->address)
 		return -EINVAL;
 
@@ -1766,47 +1877,53 @@
 
 	sock_rps_record_flow(sk);
 
-	down_read(&current->mm->mmap_sem);
+	mmap_read_lock(current->mm);
 
 	vma = find_vma(current->mm, address);
 	if (!vma || vma->vm_start > address || vma->vm_ops != &tcp_vm_ops) {
-		up_read(&current->mm->mmap_sem);
+		mmap_read_unlock(current->mm);
 		return -EINVAL;
 	}
-	zc->length = min_t(unsigned long, zc->length, vma->vm_end - address);
-
-	tp = tcp_sk(sk);
-	seq = tp->copied_seq;
-	inq = tcp_inq(sk);
-	zc->length = min_t(u32, zc->length, inq);
-	zc->length &= ~(PAGE_SIZE - 1);
-	if (zc->length) {
-		zap_page_range(vma, address, zc->length);
+	vma_len = min_t(unsigned long, zc->length, vma->vm_end - address);
+	avail_len = min_t(u32, vma_len, inq);
+	aligned_len = avail_len & ~(PAGE_SIZE - 1);
+	if (aligned_len) {
+		zap_page_range(vma, address, aligned_len);
+		zc->length = aligned_len;
 		zc->recv_skip_hint = 0;
 	} else {
-		zc->recv_skip_hint = inq;
+		zc->length = avail_len;
+		zc->recv_skip_hint = avail_len;
 	}
 	ret = 0;
+	curr_addr = address;
 	while (length + PAGE_SIZE <= zc->length) {
 		if (zc->recv_skip_hint < PAGE_SIZE) {
+			u32 offset_frag;
+
+			/* If we're here, finish the current batch. */
+			if (pg_idx) {
+				ret = tcp_zerocopy_vm_insert_batch(vma, pages,
+								   pg_idx,
+								   &curr_addr,
+								   &length,
+								   &seq, zc);
+				if (ret)
+					goto out;
+				pg_idx = 0;
+			}
 			if (skb) {
+				if (zc->recv_skip_hint > 0)
+					break;
 				skb = skb->next;
 				offset = seq - TCP_SKB_CB(skb)->seq;
 			} else {
 				skb = tcp_recv_skb(sk, seq, &offset);
 			}
-
 			zc->recv_skip_hint = skb->len - offset;
-			offset -= skb_headlen(skb);
-			if ((int)offset < 0 || skb_has_frag_list(skb))
+			frags = skb_advance_to_frag(skb, offset, &offset_frag);
+			if (!frags || offset_frag)
 				break;
-			frags = skb_shinfo(skb)->frags;
-			while (offset) {
-				if (skb_frag_size(frags) > offset)
-					goto out;
-				offset -= skb_frag_size(frags);
-				frags++;
-			}
 		}
 		if (skb_frag_size(frags) != PAGE_SIZE || skb_frag_off(frags)) {
 			int remaining = zc->recv_skip_hint;
@@ -1819,24 +1936,39 @@
 			zc->recv_skip_hint -= remaining;
 			break;
 		}
-		ret = vm_insert_page(vma, address + length,
-				     skb_frag_page(frags));
-		if (ret)
-			break;
+		pages[pg_idx] = skb_frag_page(frags);
+		pg_idx++;
 		length += PAGE_SIZE;
-		seq += PAGE_SIZE;
 		zc->recv_skip_hint -= PAGE_SIZE;
 		frags++;
+		if (pg_idx == PAGE_BATCH_SIZE) {
+			ret = tcp_zerocopy_vm_insert_batch(vma, pages, pg_idx,
+							   &curr_addr, &length,
+							   &seq, zc);
+			if (ret)
+				goto out;
+			pg_idx = 0;
+		}
+	}
+	if (pg_idx) {
+		ret = tcp_zerocopy_vm_insert_batch(vma, pages, pg_idx,
+						   &curr_addr, &length, &seq,
+						   zc);
 	}
 out:
-	up_read(&current->mm->mmap_sem);
-	if (length) {
+	mmap_read_unlock(current->mm);
+	/* Try to copy straggler data. */
+	if (!ret)
+		copylen = tcp_zerocopy_handle_leftover_data(zc, sk, skb, &seq,
+							    copybuf_len);
+
+	if (length + copylen) {
 		WRITE_ONCE(tp->copied_seq, seq);
 		tcp_rcv_space_adjust(sk);
 
 		/* Clean up data we have read: This will do ACK frames. */
 		tcp_recv_skb(sk, seq, &offset);
-		tcp_cleanup_rbuf(sk, length);
+		tcp_cleanup_rbuf(sk, length + copylen);
 		ret = 0;
 		if (length == zc->length)
 			zc->recv_skip_hint = 0;
@@ -1874,29 +2006,33 @@
 		if (sock_flag(sk, SOCK_RCVTSTAMP)) {
 			if (sock_flag(sk, SOCK_RCVTSTAMPNS)) {
 				if (new_tstamp) {
-					struct __kernel_timespec kts = {tss->ts[0].tv_sec, tss->ts[0].tv_nsec};
-
+					struct __kernel_timespec kts = {
+						.tv_sec = tss->ts[0].tv_sec,
+						.tv_nsec = tss->ts[0].tv_nsec,
+					};
 					put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
 						 sizeof(kts), &kts);
 				} else {
-					struct timespec ts_old = timespec64_to_timespec(tss->ts[0]);
-
+					struct __kernel_old_timespec ts_old = {
+						.tv_sec = tss->ts[0].tv_sec,
+						.tv_nsec = tss->ts[0].tv_nsec,
+					};
 					put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
 						 sizeof(ts_old), &ts_old);
 				}
 			} else {
 				if (new_tstamp) {
-					struct __kernel_sock_timeval stv;
-
-					stv.tv_sec = tss->ts[0].tv_sec;
-					stv.tv_usec = tss->ts[0].tv_nsec / 1000;
+					struct __kernel_sock_timeval stv = {
+						.tv_sec = tss->ts[0].tv_sec,
+						.tv_usec = tss->ts[0].tv_nsec / 1000,
+					};
 					put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
 						 sizeof(stv), &stv);
 				} else {
-					struct __kernel_old_timeval tv;
-
-					tv.tv_sec = tss->ts[0].tv_sec;
-					tv.tv_usec = tss->ts[0].tv_nsec / 1000;
+					struct __kernel_old_timeval tv = {
+						.tv_sec = tss->ts[0].tv_sec,
+						.tv_usec = tss->ts[0].tv_nsec / 1000,
+					};
 					put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
 						 sizeof(tv), &tv);
 				}
@@ -2260,7 +2396,7 @@
 		if (inet_csk(sk)->icsk_bind_hash &&
 		    !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
 			inet_put_port(sk);
-		/* fall through */
+		fallthrough;
 	default:
 		if (oldstate == TCP_ESTABLISHED)
 			TCP_DEC_STATS(sock_net(sk), TCP_MIB_CURRESTAB);
@@ -2332,11 +2468,36 @@
 }
 EXPORT_SYMBOL(tcp_shutdown);
 
+int tcp_orphan_count_sum(void)
+{
+	int i, total = 0;
+
+	for_each_possible_cpu(i)
+		total += per_cpu(tcp_orphan_count, i);
+
+	return max(total, 0);
+}
+
+static int tcp_orphan_cache;
+static struct timer_list tcp_orphan_timer;
+#define TCP_ORPHAN_TIMER_PERIOD msecs_to_jiffies(100)
+
+static void tcp_orphan_update(struct timer_list *unused)
+{
+	WRITE_ONCE(tcp_orphan_cache, tcp_orphan_count_sum());
+	mod_timer(&tcp_orphan_timer, jiffies + TCP_ORPHAN_TIMER_PERIOD);
+}
+
+static bool tcp_too_many_orphans(int shift)
+{
+	return READ_ONCE(tcp_orphan_cache) << shift > sysctl_tcp_max_orphans;
+}
+
 bool tcp_check_oom(struct sock *sk, int shift)
 {
 	bool too_many_orphans, out_of_socket_memory;
 
-	too_many_orphans = tcp_too_many_orphans(sk, shift);
+	too_many_orphans = tcp_too_many_orphans(shift);
 	out_of_socket_memory = tcp_out_of_memory(sk);
 
 	if (too_many_orphans)
@@ -2446,7 +2607,7 @@
 	/* remove backlog if any, without releasing ownership. */
 	__release_sock(sk);
 
-	percpu_counter_inc(sk->sk_prot->orphan_count);
+	this_cpu_inc(tcp_orphan_count);
 
 	/* Have we already been destroyed by a softirq or backlog? */
 	if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE)
@@ -2625,10 +2786,11 @@
 	WRITE_ONCE(tp->write_seq, seq);
 
 	icsk->icsk_backoff = 0;
-	tp->snd_cwnd = 2;
 	icsk->icsk_probes_out = 0;
 	icsk->icsk_probes_tstamp = 0;
 	icsk->icsk_rto = TCP_TIMEOUT_INIT;
+	icsk->icsk_rto_min = TCP_RTO_MIN;
+	icsk->icsk_delack_max = TCP_DELACK_MAX;
 	tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
 	tp->snd_cwnd = TCP_INIT_CWND;
 	tp->snd_cwnd_cnt = 0;
@@ -2638,6 +2800,7 @@
 	if (icsk->icsk_ca_ops->release)
 		icsk->icsk_ca_ops->release(sk);
 	memset(icsk->icsk_ca_priv, 0, sizeof(icsk->icsk_ca_priv));
+	icsk->icsk_ca_initialized = 0;
 	tcp_set_ca_state(sk, TCP_CA_Open);
 	tp->is_sack_reneg = 0;
 	tcp_clear_retrans(tp);
@@ -2687,6 +2850,7 @@
 	/* Clean up fastopen related fields */
 	tcp_free_fastopen_req(tp);
 	inet->defer_connect = 0;
+	tp->fastopen_client_fail = 0;
 
 	WARN_ON(inet->inet_num && !icsk->icsk_bind_hash);
 
@@ -2707,7 +2871,7 @@
 		(sk->sk_state != TCP_LISTEN);
 }
 
-static int tcp_repair_set_window(struct tcp_sock *tp, char __user *optbuf, int len)
+static int tcp_repair_set_window(struct tcp_sock *tp, sockptr_t optbuf, int len)
 {
 	struct tcp_repair_window opt;
 
@@ -2717,7 +2881,7 @@
 	if (len != sizeof(opt))
 		return -EINVAL;
 
-	if (copy_from_user(&opt, optbuf, sizeof(opt)))
+	if (copy_from_sockptr(&opt, optbuf, sizeof(opt)))
 		return -EFAULT;
 
 	if (opt.max_window < opt.snd_wnd)
@@ -2739,17 +2903,18 @@
 	return 0;
 }
 
-static int tcp_repair_options_est(struct sock *sk,
-		struct tcp_repair_opt __user *optbuf, unsigned int len)
+static int tcp_repair_options_est(struct sock *sk, sockptr_t optbuf,
+		unsigned int len)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_repair_opt opt;
+	size_t offset = 0;
 
 	while (len >= sizeof(opt)) {
-		if (copy_from_user(&opt, optbuf, sizeof(opt)))
+		if (copy_from_sockptr_offset(&opt, optbuf, offset, sizeof(opt)))
 			return -EFAULT;
 
-		optbuf++;
+		offset += sizeof(opt);
 		len -= sizeof(opt);
 
 		switch (opt.opt_code) {
@@ -2803,11 +2968,168 @@
 	}
 }
 
+/* When set indicates to always queue non-full frames.  Later the user clears
+ * this option and we transmit any pending partial frames in the queue.  This is
+ * meant to be used alongside sendfile() to get properly filled frames when the
+ * user (for example) must write out headers with a write() call first and then
+ * use sendfile to send out the data parts.
+ *
+ * TCP_CORK can be set together with TCP_NODELAY and it is stronger than
+ * TCP_NODELAY.
+ */
+static void __tcp_sock_set_cork(struct sock *sk, bool on)
+{
+	struct tcp_sock *tp = tcp_sk(sk);
+
+	if (on) {
+		tp->nonagle |= TCP_NAGLE_CORK;
+	} else {
+		tp->nonagle &= ~TCP_NAGLE_CORK;
+		if (tp->nonagle & TCP_NAGLE_OFF)
+			tp->nonagle |= TCP_NAGLE_PUSH;
+		tcp_push_pending_frames(sk);
+	}
+}
+
+void tcp_sock_set_cork(struct sock *sk, bool on)
+{
+	lock_sock(sk);
+	__tcp_sock_set_cork(sk, on);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(tcp_sock_set_cork);
+
+/* TCP_NODELAY is weaker than TCP_CORK, so that this option on corked socket is
+ * remembered, but it is not activated until cork is cleared.
+ *
+ * However, when TCP_NODELAY is set we make an explicit push, which overrides
+ * even TCP_CORK for currently queued segments.
+ */
+static void __tcp_sock_set_nodelay(struct sock *sk, bool on)
+{
+	if (on) {
+		tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH;
+		tcp_push_pending_frames(sk);
+	} else {
+		tcp_sk(sk)->nonagle &= ~TCP_NAGLE_OFF;
+	}
+}
+
+void tcp_sock_set_nodelay(struct sock *sk)
+{
+	lock_sock(sk);
+	__tcp_sock_set_nodelay(sk, true);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(tcp_sock_set_nodelay);
+
+static void __tcp_sock_set_quickack(struct sock *sk, int val)
+{
+	if (!val) {
+		inet_csk_enter_pingpong_mode(sk);
+		return;
+	}
+
+	inet_csk_exit_pingpong_mode(sk);
+	if ((1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) &&
+	    inet_csk_ack_scheduled(sk)) {
+		inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_PUSHED;
+		tcp_cleanup_rbuf(sk, 1);
+		if (!(val & 1))
+			inet_csk_enter_pingpong_mode(sk);
+	}
+}
+
+void tcp_sock_set_quickack(struct sock *sk, int val)
+{
+	lock_sock(sk);
+	__tcp_sock_set_quickack(sk, val);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(tcp_sock_set_quickack);
+
+int tcp_sock_set_syncnt(struct sock *sk, int val)
+{
+	if (val < 1 || val > MAX_TCP_SYNCNT)
+		return -EINVAL;
+
+	lock_sock(sk);
+	inet_csk(sk)->icsk_syn_retries = val;
+	release_sock(sk);
+	return 0;
+}
+EXPORT_SYMBOL(tcp_sock_set_syncnt);
+
+void tcp_sock_set_user_timeout(struct sock *sk, u32 val)
+{
+	lock_sock(sk);
+	inet_csk(sk)->icsk_user_timeout = val;
+	release_sock(sk);
+}
+EXPORT_SYMBOL(tcp_sock_set_user_timeout);
+
+int tcp_sock_set_keepidle_locked(struct sock *sk, int val)
+{
+	struct tcp_sock *tp = tcp_sk(sk);
+
+	if (val < 1 || val > MAX_TCP_KEEPIDLE)
+		return -EINVAL;
+
+	tp->keepalive_time = val * HZ;
+	if (sock_flag(sk, SOCK_KEEPOPEN) &&
+	    !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
+		u32 elapsed = keepalive_time_elapsed(tp);
+
+		if (tp->keepalive_time > elapsed)
+			elapsed = tp->keepalive_time - elapsed;
+		else
+			elapsed = 0;
+		inet_csk_reset_keepalive_timer(sk, elapsed);
+	}
+
+	return 0;
+}
+
+int tcp_sock_set_keepidle(struct sock *sk, int val)
+{
+	int err;
+
+	lock_sock(sk);
+	err = tcp_sock_set_keepidle_locked(sk, val);
+	release_sock(sk);
+	return err;
+}
+EXPORT_SYMBOL(tcp_sock_set_keepidle);
+
+int tcp_sock_set_keepintvl(struct sock *sk, int val)
+{
+	if (val < 1 || val > MAX_TCP_KEEPINTVL)
+		return -EINVAL;
+
+	lock_sock(sk);
+	tcp_sk(sk)->keepalive_intvl = val * HZ;
+	release_sock(sk);
+	return 0;
+}
+EXPORT_SYMBOL(tcp_sock_set_keepintvl);
+
+int tcp_sock_set_keepcnt(struct sock *sk, int val)
+{
+	if (val < 1 || val > MAX_TCP_KEEPCNT)
+		return -EINVAL;
+
+	lock_sock(sk);
+	tcp_sk(sk)->keepalive_probes = val;
+	release_sock(sk);
+	return 0;
+}
+EXPORT_SYMBOL(tcp_sock_set_keepcnt);
+
 /*
  *	Socket option code for TCP.
  */
-static int do_tcp_setsockopt(struct sock *sk, int level,
-		int optname, char __user *optval, unsigned int optlen)
+static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
+		sockptr_t optval, unsigned int optlen)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct inet_connection_sock *icsk = inet_csk(sk);
@@ -2823,14 +3145,14 @@
 		if (optlen < 1)
 			return -EINVAL;
 
-		val = strncpy_from_user(name, optval,
+		val = strncpy_from_sockptr(name, optval,
 					min_t(long, TCP_CA_NAME_MAX-1, optlen));
 		if (val < 0)
 			return -EFAULT;
 		name[val] = 0;
 
 		lock_sock(sk);
-		err = tcp_set_congestion_control(sk, name, true, true,
+		err = tcp_set_congestion_control(sk, name, true,
 						 ns_capable(sock_net(sk)->user_ns,
 							    CAP_NET_ADMIN));
 		release_sock(sk);
@@ -2842,7 +3164,7 @@
 		if (optlen < 1)
 			return -EINVAL;
 
-		val = strncpy_from_user(name, optval,
+		val = strncpy_from_sockptr(name, optval,
 					min_t(long, TCP_ULP_NAME_MAX - 1,
 					      optlen));
 		if (val < 0)
@@ -2865,7 +3187,7 @@
 		    optlen != TCP_FASTOPEN_KEY_BUF_LENGTH)
 			return -EINVAL;
 
-		if (copy_from_user(key, optval, optlen))
+		if (copy_from_sockptr(key, optval, optlen))
 			return -EFAULT;
 
 		if (optlen == TCP_FASTOPEN_KEY_BUF_LENGTH)
@@ -2881,7 +3203,7 @@
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(val)))
 		return -EFAULT;
 
 	lock_sock(sk);
@@ -2900,20 +3222,7 @@
 		break;
 
 	case TCP_NODELAY:
-		if (val) {
-			/* TCP_NODELAY is weaker than TCP_CORK, so that
-			 * this option on corked socket is remembered, but
-			 * it is not activated until cork is cleared.
-			 *
-			 * However, when TCP_NODELAY is set we make
-			 * an explicit push, which overrides even TCP_CORK
-			 * for currently queued segments.
-			 */
-			tp->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH;
-			tcp_push_pending_frames(sk);
-		} else {
-			tp->nonagle &= ~TCP_NAGLE_OFF;
-		}
+		__tcp_sock_set_nodelay(sk, val);
 		break;
 
 	case TCP_THIN_LINEAR_TIMEOUTS:
@@ -2980,51 +3289,17 @@
 		if (!tp->repair)
 			err = -EINVAL;
 		else if (sk->sk_state == TCP_ESTABLISHED)
-			err = tcp_repair_options_est(sk,
-					(struct tcp_repair_opt __user *)optval,
-					optlen);
+			err = tcp_repair_options_est(sk, optval, optlen);
 		else
 			err = -EPERM;
 		break;
 
 	case TCP_CORK:
-		/* When set indicates to always queue non-full frames.
-		 * Later the user clears this option and we transmit
-		 * any pending partial frames in the queue.  This is
-		 * meant to be used alongside sendfile() to get properly
-		 * filled frames when the user (for example) must write
-		 * out headers with a write() call first and then use
-		 * sendfile to send out the data parts.
-		 *
-		 * TCP_CORK can be set together with TCP_NODELAY and it is
-		 * stronger than TCP_NODELAY.
-		 */
-		if (val) {
-			tp->nonagle |= TCP_NAGLE_CORK;
-		} else {
-			tp->nonagle &= ~TCP_NAGLE_CORK;
-			if (tp->nonagle&TCP_NAGLE_OFF)
-				tp->nonagle |= TCP_NAGLE_PUSH;
-			tcp_push_pending_frames(sk);
-		}
+		__tcp_sock_set_cork(sk, val);
 		break;
 
 	case TCP_KEEPIDLE:
-		if (val < 1 || val > MAX_TCP_KEEPIDLE)
-			err = -EINVAL;
-		else {
-			tp->keepalive_time = val * HZ;
-			if (sock_flag(sk, SOCK_KEEPOPEN) &&
-			    !((1 << sk->sk_state) &
-			      (TCPF_CLOSE | TCPF_LISTEN))) {
-				u32 elapsed = keepalive_time_elapsed(tp);
-				if (tp->keepalive_time > elapsed)
-					elapsed = tp->keepalive_time - elapsed;
-				else
-					elapsed = 0;
-				inet_csk_reset_keepalive_timer(sk, elapsed);
-			}
-		}
+		err = tcp_sock_set_keepidle_locked(sk, val);
 		break;
 	case TCP_KEEPINTVL:
 		if (val < 1 || val > MAX_TCP_KEEPINTVL)
@@ -3046,7 +3321,8 @@
 		break;
 
 	case TCP_SAVE_SYN:
-		if (val < 0 || val > 1)
+		/* 0: disable, 1: enable, 2: start from ether_header */
+		if (val < 0 || val > 2)
 			err = -EINVAL;
 		else
 			tp->save_syn = val;
@@ -3055,8 +3331,8 @@
 	case TCP_LINGER2:
 		if (val < 0)
 			tp->linger2 = -1;
-		else if (val > net->ipv4.sysctl_tcp_fin_timeout / HZ)
-			tp->linger2 = 0;
+		else if (val > TCP_FIN_TIMEOUT_MAX / HZ)
+			tp->linger2 = TCP_FIN_TIMEOUT_MAX;
 		else
 			tp->linger2 = val * HZ;
 		break;
@@ -3081,19 +3357,7 @@
 		break;
 
 	case TCP_QUICKACK:
-		if (!val) {
-			inet_csk_enter_pingpong_mode(sk);
-		} else {
-			inet_csk_exit_pingpong_mode(sk);
-			if ((1 << sk->sk_state) &
-			    (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) &&
-			    inet_csk_ack_scheduled(sk)) {
-				icsk->icsk_ack.pending |= ICSK_ACK_PUSHED;
-				tcp_cleanup_rbuf(sk, 1);
-				if (!(val & 1))
-					inet_csk_enter_pingpong_mode(sk);
-			}
-		}
+		__tcp_sock_set_quickack(sk, val);
 		break;
 
 #ifdef CONFIG_TCP_MD5SIG
@@ -3175,7 +3439,7 @@
 	return err;
 }
 
-int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
+int tcp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
 		   unsigned int optlen)
 {
 	const struct inet_connection_sock *icsk = inet_csk(sk);
@@ -3187,18 +3451,6 @@
 }
 EXPORT_SYMBOL(tcp_setsockopt);
 
-#ifdef CONFIG_COMPAT
-int compat_tcp_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, unsigned int optlen)
-{
-	if (level != SOL_TCP)
-		return inet_csk_compat_setsockopt(sk, level, optname,
-						  optval, optlen);
-	return do_tcp_setsockopt(sk, level, optname, optval, optlen);
-}
-EXPORT_SYMBOL(compat_tcp_setsockopt);
-#endif
-
 static void tcp_get_info_chrono_stats(const struct tcp_sock *tp,
 				      struct tcp_info *info)
 {
@@ -3251,8 +3503,8 @@
 		 * tcpi_unacked -> Number of children ready for accept()
 		 * tcpi_sacked  -> max backlog
 		 */
-		info->tcpi_unacked = sk->sk_ack_backlog;
-		info->tcpi_sacked = sk->sk_max_ack_backlog;
+		info->tcpi_unacked = READ_ONCE(sk->sk_ack_backlog);
+		info->tcpi_sacked = READ_ONCE(sk->sk_max_ack_backlog);
 		return;
 	}
 
@@ -3332,6 +3584,7 @@
 	info->tcpi_reord_seen = tp->reord_seen;
 	info->tcpi_rcv_ooopack = tp->rcv_ooopack;
 	info->tcpi_snd_wnd = tp->snd_wnd;
+	info->tcpi_fastopen_client_fail = tp->fastopen_client_fail;
 	unlock_sock_fast(sk, slow);
 }
 EXPORT_SYMBOL_GPL(tcp_get_info);
@@ -3361,10 +3614,14 @@
 		nla_total_size(sizeof(u32)) + /* TCP_NLA_DSACK_DUPS */
 		nla_total_size(sizeof(u32)) + /* TCP_NLA_REORD_SEEN */
 		nla_total_size(sizeof(u32)) + /* TCP_NLA_SRTT */
+		nla_total_size(sizeof(u16)) + /* TCP_NLA_TIMEOUT_REHASH */
+		nla_total_size(sizeof(u32)) + /* TCP_NLA_BYTES_NOTSENT */
+		nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_EDT */
 		0;
 }
 
-struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk)
+struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk,
+					       const struct sk_buff *orig_skb)
 {
 	const struct tcp_sock *tp = tcp_sk(sk);
 	struct sk_buff *stats;
@@ -3415,6 +3672,11 @@
 	nla_put_u32(stats, TCP_NLA_DSACK_DUPS, tp->dsack_dups);
 	nla_put_u32(stats, TCP_NLA_REORD_SEEN, tp->reord_seen);
 	nla_put_u32(stats, TCP_NLA_SRTT, tp->srtt_us >> 3);
+	nla_put_u16(stats, TCP_NLA_TIMEOUT_REHASH, tp->timeout_rehash);
+	nla_put_u32(stats, TCP_NLA_BYTES_NOTSENT,
+		    max_t(int, 0, tp->write_seq - tp->snd_nxt));
+	nla_put_u64_64bit(stats, TCP_NLA_EDT, orig_skb->skb_mstamp_ns,
+			  TCP_NLA_PAD);
 
 	return stats;
 }
@@ -3641,20 +3903,21 @@
 
 		lock_sock(sk);
 		if (tp->saved_syn) {
-			if (len < tp->saved_syn[0]) {
-				if (put_user(tp->saved_syn[0], optlen)) {
+			if (len < tcp_saved_syn_len(tp->saved_syn)) {
+				if (put_user(tcp_saved_syn_len(tp->saved_syn),
+					     optlen)) {
 					release_sock(sk);
 					return -EFAULT;
 				}
 				release_sock(sk);
 				return -EINVAL;
 			}
-			len = tp->saved_syn[0];
+			len = tcp_saved_syn_len(tp->saved_syn);
 			if (put_user(len, optlen)) {
 				release_sock(sk);
 				return -EFAULT;
 			}
-			if (copy_to_user(optval, tp->saved_syn + 1, len)) {
+			if (copy_to_user(optval, tp->saved_syn->data, len)) {
 				release_sock(sk);
 				return -EFAULT;
 			}
@@ -3670,18 +3933,41 @@
 	}
 #ifdef CONFIG_MMU
 	case TCP_ZEROCOPY_RECEIVE: {
-		struct tcp_zerocopy_receive zc;
+		struct tcp_zerocopy_receive zc = {};
 		int err;
 
 		if (get_user(len, optlen))
 			return -EFAULT;
-		if (len != sizeof(zc))
+		if (len < 0 ||
+		    len < offsetofend(struct tcp_zerocopy_receive, length))
 			return -EINVAL;
+		if (len > sizeof(zc)) {
+			len = sizeof(zc);
+			if (put_user(len, optlen))
+				return -EFAULT;
+		}
 		if (copy_from_user(&zc, optval, len))
 			return -EFAULT;
 		lock_sock(sk);
 		err = tcp_zerocopy_receive(sk, &zc);
 		release_sock(sk);
+		if (len >= offsetofend(struct tcp_zerocopy_receive, err))
+			goto zerocopy_rcv_sk_err;
+		switch (len) {
+		case offsetofend(struct tcp_zerocopy_receive, err):
+			goto zerocopy_rcv_sk_err;
+		case offsetofend(struct tcp_zerocopy_receive, inq):
+			goto zerocopy_rcv_inq;
+		case offsetofend(struct tcp_zerocopy_receive, length):
+		default:
+			goto zerocopy_rcv_out;
+		}
+zerocopy_rcv_sk_err:
+		if (!err)
+			zc.err = sock_error(sk);
+zerocopy_rcv_inq:
+		zc.inq = tcp_inq_hint(sk);
+zerocopy_rcv_out:
 		if (!err && copy_to_user(optval, &zc, len))
 			err = -EFAULT;
 		return err;
@@ -3710,18 +3996,6 @@
 }
 EXPORT_SYMBOL(tcp_getsockopt);
 
-#ifdef CONFIG_COMPAT
-int compat_tcp_getsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, int __user *optlen)
-{
-	if (level != SOL_TCP)
-		return inet_csk_compat_getsockopt(sk, level, optname,
-						  optval, optlen);
-	return do_tcp_getsockopt(sk, level, optname, optval, optlen);
-}
-EXPORT_SYMBOL(compat_tcp_getsockopt);
-#endif
-
 #ifdef CONFIG_TCP_MD5SIG
 static DEFINE_PER_CPU(struct tcp_md5sig_pool, tcp_md5sig_pool);
 static DEFINE_MUTEX(tcp_md5sig_mutex);
@@ -3853,8 +4127,8 @@
 	sg_init_one(&sg, key->key, keylen);
 	ahash_request_set_crypt(hp->md5_req, &sg, NULL, keylen);
 
-	/* tcp_md5_do_add() might change key->key under us */
-	return crypto_ahash_update(hp->md5_req);
+	/* We use data_race() because tcp_md5_do_add() might change key->key under us */
+	return data_race(crypto_ahash_update(hp->md5_req));
 }
 EXPORT_SYMBOL(tcp_md5_hash_key);
 
@@ -3967,10 +4241,13 @@
 
 	BUILD_BUG_ON(TCP_MIN_SND_MSS <= MAX_TCP_OPTION_SPACE);
 	BUILD_BUG_ON(sizeof(struct tcp_skb_cb) >
-		     FIELD_SIZEOF(struct sk_buff, cb));
+		     sizeof_field(struct sk_buff, cb));
 
 	percpu_counter_init(&tcp_sockets_allocated, 0, GFP_KERNEL);
-	percpu_counter_init(&tcp_orphan_count, 0, GFP_KERNEL);
+
+	timer_setup(&tcp_orphan_timer, tcp_orphan_update, TIMER_DEFERRABLE);
+	mod_timer(&tcp_orphan_timer, jiffies + TCP_ORPHAN_TIMER_PERIOD);
+
 	inet_hashinfo_init(&tcp_hashinfo);
 	inet_hashinfo2_init(&tcp_hashinfo, "tcp_listen_portaddr_hash",
 			    thash_entries, 21,  /* one slot per 2 MB*/
@@ -4041,4 +4318,5 @@
 	tcp_metrics_init();
 	BUG_ON(tcp_register_congestion_control(&tcp_reno) != 0);
 	tcp_tasklet_init();
+	mptcp_init();
 }
diff --git a/net/ipv4/tcp_bic.c b/net/ipv4/tcp_bic.c
index 645cc30..f5f588b 100644
--- a/net/ipv4/tcp_bic.c
+++ b/net/ipv4/tcp_bic.c
@@ -145,12 +145,13 @@
 	if (!tcp_is_cwnd_limited(sk))
 		return;
 
-	if (tcp_in_slow_start(tp))
-		tcp_slow_start(tp, acked);
-	else {
-		bictcp_update(ca, tp->snd_cwnd);
-		tcp_cong_avoid_ai(tp, ca->cnt, 1);
+	if (tcp_in_slow_start(tp)) {
+		acked = tcp_slow_start(tp, acked);
+		if (!acked)
+			return;
 	}
+	bictcp_update(ca, tp->snd_cwnd);
+	tcp_cong_avoid_ai(tp, ca->cnt, acked);
 }
 
 /*
diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
index 6a0c432..6b745ce 100644
--- a/net/ipv4/tcp_bpf.c
+++ b/net/ipv4/tcp_bpf.c
@@ -10,38 +10,6 @@
 #include <net/inet_common.h>
 #include <net/tls.h>
 
-static bool tcp_bpf_stream_read(const struct sock *sk)
-{
-	struct sk_psock *psock;
-	bool empty = true;
-
-	rcu_read_lock();
-	psock = sk_psock(sk);
-	if (likely(psock))
-		empty = list_empty(&psock->ingress_msg);
-	rcu_read_unlock();
-	return !empty;
-}
-
-static int tcp_bpf_wait_data(struct sock *sk, struct sk_psock *psock,
-			     int flags, long timeo, int *err)
-{
-	DEFINE_WAIT_FUNC(wait, woken_wake_function);
-	int ret = 0;
-
-	if (!timeo)
-		return ret;
-
-	add_wait_queue(sk_sleep(sk), &wait);
-	sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
-	ret = sk_wait_event(sk, &timeo,
-			    !list_empty(&psock->ingress_msg) ||
-			    !skb_queue_empty(&sk->sk_receive_queue), &wait);
-	sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
-	remove_wait_queue(sk_sleep(sk), &wait);
-	return ret;
-}
-
 int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock,
 		      struct msghdr *msg, int len, int flags)
 {
@@ -122,52 +90,6 @@
 }
 EXPORT_SYMBOL_GPL(__tcp_bpf_recvmsg);
 
-int tcp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
-		    int nonblock, int flags, int *addr_len)
-{
-	struct sk_psock *psock;
-	int copied, ret;
-
-	if (unlikely(flags & MSG_ERRQUEUE))
-		return inet_recv_error(sk, msg, len, addr_len);
-
-	psock = sk_psock_get(sk);
-	if (unlikely(!psock))
-		return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
-	if (!skb_queue_empty(&sk->sk_receive_queue) &&
-	    sk_psock_queue_empty(psock)) {
-		sk_psock_put(sk, psock);
-		return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
-	}
-	lock_sock(sk);
-msg_bytes_ready:
-	copied = __tcp_bpf_recvmsg(sk, psock, msg, len, flags);
-	if (!copied) {
-		int data, err = 0;
-		long timeo;
-
-		timeo = sock_rcvtimeo(sk, nonblock);
-		data = tcp_bpf_wait_data(sk, psock, flags, timeo, &err);
-		if (data) {
-			if (!sk_psock_queue_empty(psock))
-				goto msg_bytes_ready;
-			release_sock(sk);
-			sk_psock_put(sk, psock);
-			return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
-		}
-		if (err) {
-			ret = err;
-			goto out;
-		}
-		copied = -EAGAIN;
-	}
-	ret = copied;
-out:
-	release_sock(sk);
-	sk_psock_put(sk, psock);
-	return ret;
-}
-
 static int bpf_tcp_ingress(struct sock *sk, struct sk_psock *psock,
 			   struct sk_msg *msg, u32 apply_bytes, int flags)
 {
@@ -307,12 +229,95 @@
 }
 EXPORT_SYMBOL_GPL(tcp_bpf_sendmsg_redir);
 
+#ifdef CONFIG_BPF_STREAM_PARSER
+static bool tcp_bpf_stream_read(const struct sock *sk)
+{
+	struct sk_psock *psock;
+	bool empty = true;
+
+	rcu_read_lock();
+	psock = sk_psock(sk);
+	if (likely(psock))
+		empty = list_empty(&psock->ingress_msg);
+	rcu_read_unlock();
+	return !empty;
+}
+
+static int tcp_bpf_wait_data(struct sock *sk, struct sk_psock *psock,
+			     int flags, long timeo, int *err)
+{
+	DEFINE_WAIT_FUNC(wait, woken_wake_function);
+	int ret = 0;
+
+	if (sk->sk_shutdown & RCV_SHUTDOWN)
+		return 1;
+
+	if (!timeo)
+		return ret;
+
+	add_wait_queue(sk_sleep(sk), &wait);
+	sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
+	ret = sk_wait_event(sk, &timeo,
+			    !list_empty(&psock->ingress_msg) ||
+			    !skb_queue_empty(&sk->sk_receive_queue), &wait);
+	sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
+	remove_wait_queue(sk_sleep(sk), &wait);
+	return ret;
+}
+
+static int tcp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
+		    int nonblock, int flags, int *addr_len)
+{
+	struct sk_psock *psock;
+	int copied, ret;
+
+	if (unlikely(flags & MSG_ERRQUEUE))
+		return inet_recv_error(sk, msg, len, addr_len);
+
+	psock = sk_psock_get(sk);
+	if (unlikely(!psock))
+		return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
+	if (!skb_queue_empty(&sk->sk_receive_queue) &&
+	    sk_psock_queue_empty(psock)) {
+		sk_psock_put(sk, psock);
+		return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
+	}
+	lock_sock(sk);
+msg_bytes_ready:
+	copied = __tcp_bpf_recvmsg(sk, psock, msg, len, flags);
+	if (!copied) {
+		int data, err = 0;
+		long timeo;
+
+		timeo = sock_rcvtimeo(sk, nonblock);
+		data = tcp_bpf_wait_data(sk, psock, flags, timeo, &err);
+		if (data) {
+			if (!sk_psock_queue_empty(psock))
+				goto msg_bytes_ready;
+			release_sock(sk);
+			sk_psock_put(sk, psock);
+			return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
+		}
+		if (err) {
+			ret = err;
+			goto out;
+		}
+		copied = -EAGAIN;
+	}
+	ret = copied;
+out:
+	release_sock(sk);
+	sk_psock_put(sk, psock);
+	return ret;
+}
+
 static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
 				struct sk_msg *msg, int *copied, int flags)
 {
 	bool cork = false, enospc = sk_msg_full(msg);
 	struct sock *sk_redir;
 	u32 tosend, delta = 0;
+	u32 eval = __SK_NONE;
 	int ret;
 
 more_data:
@@ -356,13 +361,24 @@
 	case __SK_REDIRECT:
 		sk_redir = psock->sk_redir;
 		sk_msg_apply_bytes(psock, tosend);
+		if (!psock->apply_bytes) {
+			/* Clean up before releasing the sock lock. */
+			eval = psock->eval;
+			psock->eval = __SK_NONE;
+			psock->sk_redir = NULL;
+		}
 		if (psock->cork) {
 			cork = true;
 			psock->cork = NULL;
 		}
 		sk_msg_return(sk, msg, tosend);
 		release_sock(sk);
+
 		ret = tcp_bpf_sendmsg_redir(sk_redir, msg, tosend, flags);
+
+		if (eval == __SK_REDIRECT)
+			sock_put(sk_redir);
+
 		lock_sock(sk);
 		if (unlikely(ret < 0)) {
 			int free = sk_msg_free_nocharge(sk, msg);
@@ -537,57 +553,6 @@
 	return copied ? copied : err;
 }
 
-static void tcp_bpf_remove(struct sock *sk, struct sk_psock *psock)
-{
-	struct sk_psock_link *link;
-
-	while ((link = sk_psock_link_pop(psock))) {
-		sk_psock_unlink(sk, link);
-		sk_psock_free_link(link);
-	}
-}
-
-static void tcp_bpf_unhash(struct sock *sk)
-{
-	void (*saved_unhash)(struct sock *sk);
-	struct sk_psock *psock;
-
-	rcu_read_lock();
-	psock = sk_psock(sk);
-	if (unlikely(!psock)) {
-		rcu_read_unlock();
-		if (sk->sk_prot->unhash)
-			sk->sk_prot->unhash(sk);
-		return;
-	}
-
-	saved_unhash = psock->saved_unhash;
-	tcp_bpf_remove(sk, psock);
-	rcu_read_unlock();
-	saved_unhash(sk);
-}
-
-static void tcp_bpf_close(struct sock *sk, long timeout)
-{
-	void (*saved_close)(struct sock *sk, long timeout);
-	struct sk_psock *psock;
-
-	lock_sock(sk);
-	rcu_read_lock();
-	psock = sk_psock(sk);
-	if (unlikely(!psock)) {
-		rcu_read_unlock();
-		release_sock(sk);
-		return sk->sk_prot->close(sk, timeout);
-	}
-
-	saved_close = psock->saved_close;
-	tcp_bpf_remove(sk, psock);
-	rcu_read_unlock();
-	release_sock(sk);
-	saved_close(sk, timeout);
-}
-
 enum {
 	TCP_BPF_IPV4,
 	TCP_BPF_IPV6,
@@ -608,8 +573,7 @@
 				   struct proto *base)
 {
 	prot[TCP_BPF_BASE]			= *base;
-	prot[TCP_BPF_BASE].unhash		= tcp_bpf_unhash;
-	prot[TCP_BPF_BASE].close		= tcp_bpf_close;
+	prot[TCP_BPF_BASE].close		= sock_map_close;
 	prot[TCP_BPF_BASE].recvmsg		= tcp_bpf_recvmsg;
 	prot[TCP_BPF_BASE].stream_memory_read	= tcp_bpf_stream_read;
 
@@ -618,10 +582,9 @@
 	prot[TCP_BPF_TX].sendpage		= tcp_bpf_sendpage;
 }
 
-static void tcp_bpf_check_v6_needs_rebuild(struct sock *sk, struct proto *ops)
+static void tcp_bpf_check_v6_needs_rebuild(struct proto *ops)
 {
-	if (sk->sk_family == AF_INET6 &&
-	    unlikely(ops != smp_load_acquire(&tcpv6_prot_saved))) {
+	if (unlikely(ops != smp_load_acquire(&tcpv6_prot_saved))) {
 		spin_lock_bh(&tcpv6_prot_lock);
 		if (likely(ops != tcpv6_prot_saved)) {
 			tcp_bpf_rebuild_protos(tcp_bpf_prots[TCP_BPF_IPV6], ops);
@@ -638,26 +601,6 @@
 }
 late_initcall(tcp_bpf_v4_build_proto);
 
-static void tcp_bpf_update_sk_prot(struct sock *sk, struct sk_psock *psock)
-{
-	int family = sk->sk_family == AF_INET6 ? TCP_BPF_IPV6 : TCP_BPF_IPV4;
-	int config = psock->progs.msg_parser   ? TCP_BPF_TX   : TCP_BPF_BASE;
-
-	sk_psock_update_proto(sk, psock, &tcp_bpf_prots[family][config]);
-}
-
-static void tcp_bpf_reinit_sk_prot(struct sock *sk, struct sk_psock *psock)
-{
-	int family = sk->sk_family == AF_INET6 ? TCP_BPF_IPV6 : TCP_BPF_IPV4;
-	int config = psock->progs.msg_parser   ? TCP_BPF_TX   : TCP_BPF_BASE;
-
-	/* Reinit occurs when program types change e.g. TCP_BPF_TX is removed
-	 * or added requiring sk_prot hook updates. We keep original saved
-	 * hooks in this case.
-	 */
-	sk->sk_prot = &tcp_bpf_prots[family][config];
-}
-
 static int tcp_bpf_assert_proto_ops(struct proto *ops)
 {
 	/* In order to avoid retpoline, we make assumptions when we call
@@ -669,34 +612,32 @@
 	       ops->sendpage == tcp_sendpage ? 0 : -ENOTSUPP;
 }
 
-void tcp_bpf_reinit(struct sock *sk)
+struct proto *tcp_bpf_get_proto(struct sock *sk, struct sk_psock *psock)
 {
-	struct sk_psock *psock;
+	int family = sk->sk_family == AF_INET6 ? TCP_BPF_IPV6 : TCP_BPF_IPV4;
+	int config = psock->progs.msg_parser   ? TCP_BPF_TX   : TCP_BPF_BASE;
 
-	sock_owned_by_me(sk);
+	if (sk->sk_family == AF_INET6) {
+		if (tcp_bpf_assert_proto_ops(psock->sk_proto))
+			return ERR_PTR(-EINVAL);
 
-	rcu_read_lock();
-	psock = sk_psock(sk);
-	tcp_bpf_reinit_sk_prot(sk, psock);
-	rcu_read_unlock();
-}
-
-int tcp_bpf_init(struct sock *sk)
-{
-	struct proto *ops = READ_ONCE(sk->sk_prot);
-	struct sk_psock *psock;
-
-	sock_owned_by_me(sk);
-
-	rcu_read_lock();
-	psock = sk_psock(sk);
-	if (unlikely(!psock || psock->sk_proto ||
-		     tcp_bpf_assert_proto_ops(ops))) {
-		rcu_read_unlock();
-		return -EINVAL;
+		tcp_bpf_check_v6_needs_rebuild(psock->sk_proto);
 	}
-	tcp_bpf_check_v6_needs_rebuild(sk, ops);
-	tcp_bpf_update_sk_prot(sk, psock);
-	rcu_read_unlock();
-	return 0;
+
+	return &tcp_bpf_prots[family][config];
 }
+
+/* If a child got cloned from a listening socket that had tcp_bpf
+ * protocol callbacks installed, we need to restore the callbacks to
+ * the default ones because the child does not inherit the psock state
+ * that tcp_bpf callbacks expect.
+ */
+void tcp_bpf_clone(const struct sock *sk, struct sock *newsk)
+{
+	int family = sk->sk_family == AF_INET6 ? TCP_BPF_IPV6 : TCP_BPF_IPV4;
+	struct proto *prot = newsk->sk_prot;
+
+	if (prot == &tcp_bpf_prots[family][TCP_BPF_BASE])
+		newsk->sk_prot = sk->sk_prot_creator;
+}
+#endif /* CONFIG_BPF_STREAM_PARSER */
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 6d56008..db5831e 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -21,7 +21,7 @@
 static LIST_HEAD(tcp_cong_list);
 
 /* Simple linear search, don't expect many entries! */
-static struct tcp_congestion_ops *tcp_ca_find(const char *name)
+struct tcp_congestion_ops *tcp_ca_find(const char *name)
 {
 	struct tcp_congestion_ops *e;
 
@@ -162,7 +162,7 @@
 
 	rcu_read_lock();
 	ca = rcu_dereference(net->ipv4.tcp_congestion_control);
-	if (unlikely(!try_module_get(ca->owner)))
+	if (unlikely(!bpf_try_module_get(ca, ca->owner)))
 		ca = &tcp_reno;
 	icsk->icsk_ca_ops = ca;
 	rcu_read_unlock();
@@ -176,7 +176,7 @@
 
 void tcp_init_congestion_control(struct sock *sk)
 {
-	const struct inet_connection_sock *icsk = inet_csk(sk);
+	struct inet_connection_sock *icsk = inet_csk(sk);
 
 	tcp_sk(sk)->prior_ssthresh = 0;
 	if (icsk->icsk_ca_ops->init)
@@ -185,6 +185,7 @@
 		INET_ECN_xmit(sk);
 	else
 		INET_ECN_dontxmit(sk);
+	icsk->icsk_ca_initialized = 1;
 }
 
 static void tcp_reinit_congestion_control(struct sock *sk,
@@ -213,7 +214,7 @@
 
 	if (icsk->icsk_ca_ops->release)
 		icsk->icsk_ca_ops->release(sk);
-	module_put(icsk->icsk_ca_ops->owner);
+	bpf_module_put(icsk->icsk_ca_ops, icsk->icsk_ca_ops->owner);
 }
 
 /* Used by sysctl to change default congestion control */
@@ -227,7 +228,7 @@
 	ca = tcp_ca_find_autoload(net, name);
 	if (!ca) {
 		ret = -ENOENT;
-	} else if (!try_module_get(ca->owner)) {
+	} else if (!bpf_try_module_get(ca, ca->owner)) {
 		ret = -EBUSY;
 	} else if (!net_eq(net, &init_net) &&
 			!(ca->flags & TCP_CONG_NON_RESTRICTED)) {
@@ -236,7 +237,7 @@
 	} else {
 		prev = xchg(&net->ipv4.tcp_congestion_control, ca);
 		if (prev)
-			module_put(prev->owner);
+			bpf_module_put(prev, prev->owner);
 
 		ca->flags |= TCP_CONG_NON_RESTRICTED;
 		ret = 0;
@@ -265,6 +266,9 @@
 		offs += snprintf(buf + offs, maxlen - offs,
 				 "%s%s",
 				 offs == 0 ? "" : " ", ca->name);
+
+		if (WARN_ON_ONCE(offs >= maxlen))
+			break;
 	}
 	rcu_read_unlock();
 }
@@ -294,6 +298,9 @@
 		offs += snprintf(buf + offs, maxlen - offs,
 				 "%s%s",
 				 offs == 0 ? "" : " ", ca->name);
+
+		if (WARN_ON_ONCE(offs >= maxlen))
+			break;
 	}
 	rcu_read_unlock();
 }
@@ -343,7 +350,7 @@
  * already initialized.
  */
 int tcp_set_congestion_control(struct sock *sk, const char *name, bool load,
-			       bool reinit, bool cap_net_admin)
+			       bool cap_net_admin)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	const struct tcp_congestion_ops *ca;
@@ -364,28 +371,14 @@
 		goto out;
 	}
 
-	if (!ca) {
+	if (!ca)
 		err = -ENOENT;
-	} else if (!load) {
-		const struct tcp_congestion_ops *old_ca = icsk->icsk_ca_ops;
-
-		if (try_module_get(ca->owner)) {
-			if (reinit) {
-				tcp_reinit_congestion_control(sk, ca);
-			} else {
-				icsk->icsk_ca_ops = ca;
-				module_put(old_ca->owner);
-			}
-		} else {
-			err = -EBUSY;
-		}
-	} else if (!((ca->flags & TCP_CONG_NON_RESTRICTED) || cap_net_admin)) {
+	else if (!((ca->flags & TCP_CONG_NON_RESTRICTED) || cap_net_admin))
 		err = -EPERM;
-	} else if (!try_module_get(ca->owner)) {
+	else if (!bpf_try_module_get(ca, ca->owner))
 		err = -EBUSY;
-	} else {
+	else
 		tcp_reinit_congestion_control(sk, ca);
-	}
  out:
 	rcu_read_unlock();
 	return err;
diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c
index ee6c38a..fffa011 100644
--- a/net/ipv4/tcp_cubic.c
+++ b/net/ipv4/tcp_cubic.c
@@ -40,8 +40,8 @@
 
 /* Number of delay samples for detecting the increase of delay */
 #define HYSTART_MIN_SAMPLES	8
-#define HYSTART_DELAY_MIN	(4U<<3)
-#define HYSTART_DELAY_MAX	(16U<<3)
+#define HYSTART_DELAY_MIN	(4000U)	/* 4 ms */
+#define HYSTART_DELAY_MAX	(16000U)	/* 16 ms */
 #define HYSTART_DELAY_THRESH(x)	clamp(x, HYSTART_DELAY_MIN, HYSTART_DELAY_MAX)
 
 static int fast_convergence __read_mostly = 1;
@@ -53,7 +53,7 @@
 static int hystart __read_mostly = 1;
 static int hystart_detect __read_mostly = HYSTART_ACK_TRAIN | HYSTART_DELAY;
 static int hystart_low_window __read_mostly = 16;
-static int hystart_ack_delta __read_mostly = 2;
+static int hystart_ack_delta_us __read_mostly = 2000;
 
 static u32 cube_rtt_scale __read_mostly;
 static u32 beta_scale __read_mostly;
@@ -77,8 +77,8 @@
 		 " 1: packet-train 2: delay 3: both packet-train and delay");
 module_param(hystart_low_window, int, 0644);
 MODULE_PARM_DESC(hystart_low_window, "lower bound cwnd for hybrid slow start");
-module_param(hystart_ack_delta, int, 0644);
-MODULE_PARM_DESC(hystart_ack_delta, "spacing between ack's indicating train (msecs)");
+module_param(hystart_ack_delta_us, int, 0644);
+MODULE_PARM_DESC(hystart_ack_delta_us, "spacing between ack's indicating train (usecs)");
 
 /* BIC TCP Parameters */
 struct bictcp {
@@ -89,7 +89,7 @@
 	u32	bic_origin_point;/* origin point of bic function */
 	u32	bic_K;		/* time to origin point
 				   from the beginning of the current epoch */
-	u32	delay_min;	/* min delay (msec << 3) */
+	u32	delay_min;	/* min delay (usec) */
 	u32	epoch_start;	/* beginning of an epoch */
 	u32	ack_cnt;	/* number of acks */
 	u32	tcp_cwnd;	/* estimated tcp cwnd */
@@ -117,13 +117,9 @@
 	ca->found = 0;
 }
 
-static inline u32 bictcp_clock(void)
+static inline u32 bictcp_clock_us(const struct sock *sk)
 {
-#if HZ < 1000
-	return ktime_to_ms(ktime_get_real());
-#else
-	return jiffies_to_msecs(jiffies);
-#endif
+	return tcp_sk(sk)->tcp_mstamp;
 }
 
 static inline void bictcp_hystart_reset(struct sock *sk)
@@ -131,9 +127,9 @@
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct bictcp *ca = inet_csk_ca(sk);
 
-	ca->round_start = ca->last_ack = bictcp_clock();
+	ca->round_start = ca->last_ack = bictcp_clock_us(sk);
 	ca->end_seq = tp->snd_nxt;
-	ca->curr_rtt = 0;
+	ca->curr_rtt = ~0U;
 	ca->sample_cnt = 0;
 }
 
@@ -276,7 +272,7 @@
 	 */
 
 	t = (s32)(tcp_jiffies32 - ca->epoch_start);
-	t += msecs_to_jiffies(ca->delay_min >> 3);
+	t += usecs_to_jiffies(ca->delay_min);
 	/* change the unit from HZ to bictcp_HZ */
 	t <<= BICTCP_HZ;
 	do_div(t, HZ);
@@ -341,8 +337,6 @@
 		return;
 
 	if (tcp_in_slow_start(tp)) {
-		if (hystart && after(ack, ca->end_seq))
-			bictcp_hystart_reset(sk);
 		acked = tcp_slow_start(tp, acked);
 		if (!acked)
 			return;
@@ -376,22 +370,57 @@
 	}
 }
 
+/* Account for TSO/GRO delays.
+ * Otherwise short RTT flows could get too small ssthresh, since during
+ * slow start we begin with small TSO packets and ca->delay_min would
+ * not account for long aggregation delay when TSO packets get bigger.
+ * Ideally even with a very small RTT we would like to have at least one
+ * TSO packet being sent and received by GRO, and another one in qdisc layer.
+ * We apply another 100% factor because @rate is doubled at this point.
+ * We cap the cushion to 1ms.
+ */
+static u32 hystart_ack_delay(struct sock *sk)
+{
+	unsigned long rate;
+
+	rate = READ_ONCE(sk->sk_pacing_rate);
+	if (!rate)
+		return 0;
+	return min_t(u64, USEC_PER_MSEC,
+		     div64_ul((u64)GSO_MAX_SIZE * 4 * USEC_PER_SEC, rate));
+}
+
 static void hystart_update(struct sock *sk, u32 delay)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct bictcp *ca = inet_csk_ca(sk);
+	u32 threshold;
 
-	if (ca->found & hystart_detect)
-		return;
+	if (after(tp->snd_una, ca->end_seq))
+		bictcp_hystart_reset(sk);
 
 	if (hystart_detect & HYSTART_ACK_TRAIN) {
-		u32 now = bictcp_clock();
+		u32 now = bictcp_clock_us(sk);
 
 		/* first detection parameter - ack-train detection */
-		if ((s32)(now - ca->last_ack) <= hystart_ack_delta) {
+		if ((s32)(now - ca->last_ack) <= hystart_ack_delta_us) {
 			ca->last_ack = now;
-			if ((s32)(now - ca->round_start) > ca->delay_min >> 4) {
-				ca->found |= HYSTART_ACK_TRAIN;
+
+			threshold = ca->delay_min + hystart_ack_delay(sk);
+
+			/* Hystart ack train triggers if we get ack past
+			 * ca->delay_min/2.
+			 * Pacing might have delayed packets up to RTT/2
+			 * during slow start.
+			 */
+			if (sk->sk_pacing_status == SK_PACING_NONE)
+				threshold >>= 1;
+
+			if ((s32)(now - ca->round_start) > threshold) {
+				ca->found = 1;
+				pr_debug("hystart_ack_train (%u > %u) delay_min %u (+ ack_delay %u) cwnd %u\n",
+					 now - ca->round_start, threshold,
+					 ca->delay_min, hystart_ack_delay(sk), tp->snd_cwnd);
 				NET_INC_STATS(sock_net(sk),
 					      LINUX_MIB_TCPHYSTARTTRAINDETECT);
 				NET_ADD_STATS(sock_net(sk),
@@ -407,14 +436,11 @@
 		if (ca->curr_rtt > delay)
 			ca->curr_rtt = delay;
 		if (ca->sample_cnt < HYSTART_MIN_SAMPLES) {
-			if (ca->curr_rtt == 0 || ca->curr_rtt > delay)
-				ca->curr_rtt = delay;
-
 			ca->sample_cnt++;
 		} else {
 			if (ca->curr_rtt > ca->delay_min +
 			    HYSTART_DELAY_THRESH(ca->delay_min >> 3)) {
-				ca->found |= HYSTART_DELAY;
+				ca->found = 1;
 				NET_INC_STATS(sock_net(sk),
 					      LINUX_MIB_TCPHYSTARTDELAYDETECT);
 				NET_ADD_STATS(sock_net(sk),
@@ -426,9 +452,6 @@
 	}
 }
 
-/* Track delayed acknowledgment ratio using sliding window
- * ratio = (15*ratio + sample) / 16
- */
 static void bictcp_acked(struct sock *sk, const struct ack_sample *sample)
 {
 	const struct tcp_sock *tp = tcp_sk(sk);
@@ -443,7 +466,7 @@
 	if (ca->epoch_start && (s32)(tcp_jiffies32 - ca->epoch_start) < HZ)
 		return;
 
-	delay = (sample->rtt_us << 3) / USEC_PER_MSEC;
+	delay = sample->rtt_us;
 	if (delay == 0)
 		delay = 1;
 
@@ -452,7 +475,7 @@
 		ca->delay_min = delay;
 
 	/* hystart triggers when cwnd is larger than some threshold */
-	if (hystart && tcp_in_slow_start(tp) &&
+	if (!ca->found && tcp_in_slow_start(tp) && hystart &&
 	    tp->snd_cwnd >= hystart_low_window)
 		hystart_update(sk, delay);
 }
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 5495061..75a1c98 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -21,8 +21,8 @@
 	struct tcp_info *info = _info;
 
 	if (inet_sk_state_load(sk) == TCP_LISTEN) {
-		r->idiag_rqueue = sk->sk_ack_backlog;
-		r->idiag_wqueue = sk->sk_max_ack_backlog;
+		r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
+		r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog);
 	} else if (sk->sk_type == SOCK_STREAM) {
 		const struct tcp_sock *tp = tcp_sk(sk);
 
@@ -179,15 +179,15 @@
 }
 
 static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
-			  const struct inet_diag_req_v2 *r, struct nlattr *bc)
+			  const struct inet_diag_req_v2 *r)
 {
-	inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
+	inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r);
 }
 
-static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
+static int tcp_diag_dump_one(struct netlink_callback *cb,
 			     const struct inet_diag_req_v2 *req)
 {
-	return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
+	return inet_diag_dump_one_icsk(&tcp_hashinfo, cb, req);
 }
 
 #ifdef CONFIG_INET_DIAG_DESTROY
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c
index a5ec77a..1071119 100644
--- a/net/ipv4/tcp_fastopen.c
+++ b/net/ipv4/tcp_fastopen.c
@@ -38,7 +38,7 @@
 	struct tcp_fastopen_context *ctx =
 	    container_of(head, struct tcp_fastopen_context, rcu);
 
-	kzfree(ctx);
+	kfree_sensitive(ctx);
 }
 
 void tcp_fastopen_destroy_cipher(struct sock *sk)
@@ -295,7 +295,7 @@
 	refcount_set(&req->rsk_refcnt, 2);
 
 	/* Now finish processing the fastopen child socket. */
-	tcp_init_transfer(child, BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB);
+	tcp_init_transfer(child, BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB, skb);
 
 	tp->rcv_nxt = TCP_SKB_CB(skb)->seq + 1;
 
@@ -444,7 +444,10 @@
 		cookie->len = -1;
 		return true;
 	}
-	return cookie->len > 0;
+	if (cookie->len > 0)
+		return true;
+	tcp_sk(sk)->fastopen_client_fail = TFO_COOKIE_UNAVAILABLE;
+	return false;
 }
 
 /* This function checks if we want to defer sending SYN until the first
@@ -503,6 +506,9 @@
 {
 	struct net *net = sock_net(sk);
 
+	if (!sock_net(sk)->ipv4.sysctl_tcp_fastopen_blackhole_timeout)
+		return;
+
 	/* Paired with READ_ONCE() in tcp_fastopen_active_should_disable() */
 	WRITE_ONCE(net->ipv4.tfo_active_disable_stamp, jiffies);
 
@@ -522,10 +528,14 @@
 bool tcp_fastopen_active_should_disable(struct sock *sk)
 {
 	unsigned int tfo_bh_timeout = sock_net(sk)->ipv4.sysctl_tcp_fastopen_blackhole_timeout;
-	int tfo_da_times = atomic_read(&sock_net(sk)->ipv4.tfo_active_disable_times);
 	unsigned long timeout;
+	int tfo_da_times;
 	int multiplier;
 
+	if (!tfo_bh_timeout)
+		return false;
+
+	tfo_da_times = atomic_read(&sock_net(sk)->ipv4.tfo_active_disable_times);
 	if (!tfo_da_times)
 		return false;
 
diff --git a/net/ipv4/tcp_highspeed.c b/net/ipv4/tcp_highspeed.c
index bfdfbb9..349069d 100644
--- a/net/ipv4/tcp_highspeed.c
+++ b/net/ipv4/tcp_highspeed.c
@@ -2,7 +2,7 @@
 /*
  * Sally Floyd's High Speed TCP (RFC 3649) congestion control
  *
- * See http://www.icir.org/floyd/hstcp.html
+ * See https://www.icir.org/floyd/hstcp.html
  *
  * John Heffner <jheffner@psc.edu>
  */
diff --git a/net/ipv4/tcp_htcp.c b/net/ipv4/tcp_htcp.c
index 88e1f01..55adcfc 100644
--- a/net/ipv4/tcp_htcp.c
+++ b/net/ipv4/tcp_htcp.c
@@ -4,7 +4,7 @@
  * R.N.Shorten, D.J.Leith:
  *   "H-TCP: TCP for high-speed and long-distance networks"
  *   Proc. PFLDnet, Argonne, 2004.
- * http://www.hamilton.ie/net/htcp3.pdf
+ * https://www.hamilton.ie/net/htcp3.pdf
  */
 
 #include <linux/mm.h>
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index c0fcfa2..12dd08a 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -79,6 +79,7 @@
 #include <trace/events/tcp.h>
 #include <linux/jump_label_ratelimit.h>
 #include <net/busy_poll.h>
+#include <net/mptcp.h>
 
 int sysctl_tcp_max_orphans __read_mostly = NR_FILE;
 
@@ -137,6 +138,69 @@
 EXPORT_SYMBOL_GPL(clean_acked_data_flush);
 #endif
 
+#ifdef CONFIG_CGROUP_BPF
+static void bpf_skops_parse_hdr(struct sock *sk, struct sk_buff *skb)
+{
+	bool unknown_opt = tcp_sk(sk)->rx_opt.saw_unknown &&
+		BPF_SOCK_OPS_TEST_FLAG(tcp_sk(sk),
+				       BPF_SOCK_OPS_PARSE_UNKNOWN_HDR_OPT_CB_FLAG);
+	bool parse_all_opt = BPF_SOCK_OPS_TEST_FLAG(tcp_sk(sk),
+						    BPF_SOCK_OPS_PARSE_ALL_HDR_OPT_CB_FLAG);
+	struct bpf_sock_ops_kern sock_ops;
+
+	if (likely(!unknown_opt && !parse_all_opt))
+		return;
+
+	/* The skb will be handled in the
+	 * bpf_skops_established() or
+	 * bpf_skops_write_hdr_opt().
+	 */
+	switch (sk->sk_state) {
+	case TCP_SYN_RECV:
+	case TCP_SYN_SENT:
+	case TCP_LISTEN:
+		return;
+	}
+
+	sock_owned_by_me(sk);
+
+	memset(&sock_ops, 0, offsetof(struct bpf_sock_ops_kern, temp));
+	sock_ops.op = BPF_SOCK_OPS_PARSE_HDR_OPT_CB;
+	sock_ops.is_fullsock = 1;
+	sock_ops.sk = sk;
+	bpf_skops_init_skb(&sock_ops, skb, tcp_hdrlen(skb));
+
+	BPF_CGROUP_RUN_PROG_SOCK_OPS(&sock_ops);
+}
+
+static void bpf_skops_established(struct sock *sk, int bpf_op,
+				  struct sk_buff *skb)
+{
+	struct bpf_sock_ops_kern sock_ops;
+
+	sock_owned_by_me(sk);
+
+	memset(&sock_ops, 0, offsetof(struct bpf_sock_ops_kern, temp));
+	sock_ops.op = bpf_op;
+	sock_ops.is_fullsock = 1;
+	sock_ops.sk = sk;
+	/* sk with TCP_REPAIR_ON does not have skb in tcp_finish_connect */
+	if (skb)
+		bpf_skops_init_skb(&sock_ops, skb, tcp_hdrlen(skb));
+
+	BPF_CGROUP_RUN_PROG_SOCK_OPS(&sock_ops);
+}
+#else
+static void bpf_skops_parse_hdr(struct sock *sk, struct sk_buff *skb)
+{
+}
+
+static void bpf_skops_established(struct sock *sk, int bpf_op,
+				  struct sk_buff *skb)
+{
+}
+#endif
+
 static void tcp_gro_dev_warn(struct sock *sk, const struct sk_buff *skb,
 			     unsigned int len)
 {
@@ -437,7 +501,7 @@
 /* 3. Try to fixup all. It is made immediately after connection enters
  *    established state.
  */
-void tcp_init_buffer_space(struct sock *sk)
+static void tcp_init_buffer_space(struct sock *sk)
 {
 	int tcp_app_win = sock_net(sk)->ipv4.sysctl_tcp_app_win;
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -518,7 +582,7 @@
  *
  * The algorithm for RTT estimation w/o timestamps is based on
  * Dynamic Right-Sizing (DRS) by Wu Feng and Mike Fisk of LANL.
- * <http://public.lanl.gov/radiant/pubs.html#DRS>
+ * <https://public.lanl.gov/radiant/pubs.html#DRS>
  *
  * More detail on this code can be found at
  * <http://staff.psc.edu/jheffner/>,
@@ -871,12 +935,54 @@
 	return min_t(__u32, cwnd, tp->snd_cwnd_clamp);
 }
 
-/* Take a notice that peer is sending D-SACKs */
-static void tcp_dsack_seen(struct tcp_sock *tp)
+struct tcp_sacktag_state {
+	/* Timestamps for earliest and latest never-retransmitted segment
+	 * that was SACKed. RTO needs the earliest RTT to stay conservative,
+	 * but congestion control should still get an accurate delay signal.
+	 */
+	u64	first_sackt;
+	u64	last_sackt;
+	u32	reord;
+	u32	sack_delivered;
+	int	flag;
+	unsigned int mss_now;
+	struct rate_sample *rate;
+};
+
+/* Take a notice that peer is sending D-SACKs. Skip update of data delivery
+ * and spurious retransmission information if this DSACK is unlikely caused by
+ * sender's action:
+ * - DSACKed sequence range is larger than maximum receiver's window.
+ * - Total no. of DSACKed segments exceed the total no. of retransmitted segs.
+ */
+static u32 tcp_dsack_seen(struct tcp_sock *tp, u32 start_seq,
+			  u32 end_seq, struct tcp_sacktag_state *state)
 {
+	u32 seq_len, dup_segs = 1;
+
+	if (!before(start_seq, end_seq))
+		return 0;
+
+	seq_len = end_seq - start_seq;
+	/* Dubious DSACK: DSACKed range greater than maximum advertised rwnd */
+	if (seq_len > tp->max_window)
+		return 0;
+	if (seq_len > tp->mss_cache)
+		dup_segs = DIV_ROUND_UP(seq_len, tp->mss_cache);
+
+	tp->dsack_dups += dup_segs;
+	/* Skip the DSACK if dup segs weren't retransmitted by sender */
+	if (tp->dsack_dups > tp->total_retrans)
+		return 0;
+
 	tp->rx_opt.sack_ok |= TCP_DSACK_SEEN;
 	tp->rack.dsack_seen = 1;
-	tp->dsack_dups++;
+
+	state->flag |= FLAG_DSACKING_ACK;
+	/* A spurious retransmission is delivered */
+	state->sack_delivered += dup_segs;
+
+	return dup_segs;
 }
 
 /* It's reordering when higher sequence was delivered (i.e. sacked) before
@@ -914,7 +1020,11 @@
 		      ts ? LINUX_MIB_TCPTSREORDER : LINUX_MIB_TCPSACKREORDER);
 }
 
-/* This must be called before lost_out is incremented */
+ /* This must be called before lost_out or retrans_out are updated
+  * on a new loss, because we want to know if all skbs previously
+  * known to be lost have already been retransmitted, indicating
+  * that this newly lost skb is our next skb to retransmit.
+  */
 static void tcp_verify_retransmit_hint(struct tcp_sock *tp, struct sk_buff *skb)
 {
 	if ((!tp->retransmit_skb_hint && tp->retrans_out >= tp->lost_out) ||
@@ -924,44 +1034,48 @@
 		tp->retransmit_skb_hint = skb;
 }
 
-/* Sum the number of packets on the wire we have marked as lost.
- * There are two cases we care about here:
- * a) Packet hasn't been marked lost (nor retransmitted),
- *    and this is the first loss.
- * b) Packet has been marked both lost and retransmitted,
- *    and this means we think it was lost again.
+/* Sum the number of packets on the wire we have marked as lost, and
+ * notify the congestion control module that the given skb was marked lost.
  */
-static void tcp_sum_lost(struct tcp_sock *tp, struct sk_buff *skb)
+static void tcp_notify_skb_loss_event(struct tcp_sock *tp, const struct sk_buff *skb)
+{
+	tp->lost += tcp_skb_pcount(skb);
+}
+
+void tcp_mark_skb_lost(struct sock *sk, struct sk_buff *skb)
 {
 	__u8 sacked = TCP_SKB_CB(skb)->sacked;
+	struct tcp_sock *tp = tcp_sk(sk);
 
-	if (!(sacked & TCPCB_LOST) ||
-	    ((sacked & TCPCB_LOST) && (sacked & TCPCB_SACKED_RETRANS)))
-		tp->lost += tcp_skb_pcount(skb);
-}
+	if (sacked & TCPCB_SACKED_ACKED)
+		return;
 
-static void tcp_skb_mark_lost(struct tcp_sock *tp, struct sk_buff *skb)
-{
-	if (!(TCP_SKB_CB(skb)->sacked & (TCPCB_LOST|TCPCB_SACKED_ACKED))) {
-		tcp_verify_retransmit_hint(tp, skb);
-
-		tp->lost_out += tcp_skb_pcount(skb);
-		tcp_sum_lost(tp, skb);
-		TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
-	}
-}
-
-void tcp_skb_mark_lost_uncond_verify(struct tcp_sock *tp, struct sk_buff *skb)
-{
 	tcp_verify_retransmit_hint(tp, skb);
-
-	tcp_sum_lost(tp, skb);
-	if (!(TCP_SKB_CB(skb)->sacked & (TCPCB_LOST|TCPCB_SACKED_ACKED))) {
+	if (sacked & TCPCB_LOST) {
+		if (sacked & TCPCB_SACKED_RETRANS) {
+			/* Account for retransmits that are lost again */
+			TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS;
+			tp->retrans_out -= tcp_skb_pcount(skb);
+			NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPLOSTRETRANSMIT,
+				      tcp_skb_pcount(skb));
+			tcp_notify_skb_loss_event(tp, skb);
+		}
+	} else {
 		tp->lost_out += tcp_skb_pcount(skb);
 		TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
+		tcp_notify_skb_loss_event(tp, skb);
 	}
 }
 
+/* Updates the delivered and delivered_ce counts */
+static void tcp_count_delivered(struct tcp_sock *tp, u32 delivered,
+				bool ece_ack)
+{
+	tp->delivered += delivered;
+	if (ece_ack)
+		tp->delivered_ce += delivered;
+}
+
 /* This procedure tags the retransmission queue when SACKs arrive.
  *
  * We have three tag bits: SACKED(S), RETRANS(R) and LOST(L).
@@ -1094,52 +1208,43 @@
 
 static bool tcp_check_dsack(struct sock *sk, const struct sk_buff *ack_skb,
 			    struct tcp_sack_block_wire *sp, int num_sacks,
-			    u32 prior_snd_una)
+			    u32 prior_snd_una, struct tcp_sacktag_state *state)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	u32 start_seq_0 = get_unaligned_be32(&sp[0].start_seq);
 	u32 end_seq_0 = get_unaligned_be32(&sp[0].end_seq);
-	bool dup_sack = false;
+	u32 dup_segs;
 
 	if (before(start_seq_0, TCP_SKB_CB(ack_skb)->ack_seq)) {
-		dup_sack = true;
-		tcp_dsack_seen(tp);
 		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPDSACKRECV);
 	} else if (num_sacks > 1) {
 		u32 end_seq_1 = get_unaligned_be32(&sp[1].end_seq);
 		u32 start_seq_1 = get_unaligned_be32(&sp[1].start_seq);
 
-		if (!after(end_seq_0, end_seq_1) &&
-		    !before(start_seq_0, start_seq_1)) {
-			dup_sack = true;
-			tcp_dsack_seen(tp);
-			NET_INC_STATS(sock_net(sk),
-					LINUX_MIB_TCPDSACKOFORECV);
-		}
+		if (after(end_seq_0, end_seq_1) || before(start_seq_0, start_seq_1))
+			return false;
+		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPDSACKOFORECV);
+	} else {
+		return false;
 	}
 
+	dup_segs = tcp_dsack_seen(tp, start_seq_0, end_seq_0, state);
+	if (!dup_segs) {	/* Skip dubious DSACK */
+		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPDSACKIGNOREDDUBIOUS);
+		return false;
+	}
+
+	NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPDSACKRECVSEGS, dup_segs);
+
 	/* D-SACK for already forgotten data... Do dumb counting. */
-	if (dup_sack && tp->undo_marker && tp->undo_retrans > 0 &&
+	if (tp->undo_marker && tp->undo_retrans > 0 &&
 	    !after(end_seq_0, prior_snd_una) &&
 	    after(end_seq_0, tp->undo_marker))
-		tp->undo_retrans--;
+		tp->undo_retrans = max_t(int, 0, tp->undo_retrans - dup_segs);
 
-	return dup_sack;
+	return true;
 }
 
-struct tcp_sacktag_state {
-	u32	reord;
-	/* Timestamps for earliest and latest never-retransmitted segment
-	 * that was SACKed. RTO needs the earliest RTT to stay conservative,
-	 * but congestion control should still get an accurate delay signal.
-	 */
-	u64	first_sackt;
-	u64	last_sackt;
-	struct rate_sample *rate;
-	int	flag;
-	unsigned int mss_now;
-};
-
 /* Check if skb is fully within the SACK block. In presence of GSO skbs,
  * the incoming SACK may not exactly match but we can find smaller MSS
  * aligned portion of it that matches. Therefore we might need to fragment
@@ -1258,7 +1363,8 @@
 		sacked |= TCPCB_SACKED_ACKED;
 		state->flag |= FLAG_DATA_SACKED;
 		tp->sacked_out += pcount;
-		tp->delivered += pcount;  /* Out-of-order packets delivered */
+		/* Out-of-order packets delivered */
+		state->sack_delivered += pcount;
 
 		/* Lost marker hint past SACKed? Tweak RFC3517 cnt */
 		if (tp->lost_skb_hint &&
@@ -1425,7 +1531,7 @@
 	if ((TCP_SKB_CB(prev)->sacked & TCPCB_TAGBITS) != TCPCB_SACKED_ACKED)
 		goto fallback;
 
-	if (!tcp_skb_can_collapse_to(prev))
+	if (!tcp_skb_can_collapse(prev, skb))
 		goto fallback;
 
 	in_sack = !after(start_seq, TCP_SKB_CB(skb)->seq) &&
@@ -1514,6 +1620,8 @@
 	    (mss != tcp_skb_seglen(skb)))
 		goto out;
 
+	if (!tcp_skb_can_collapse(prev, skb))
+		goto out;
 	len = skb->len;
 	pcount = tcp_skb_pcount(skb);
 	if (tcp_skb_shift(prev, skb, pcount, len))
@@ -1681,11 +1789,7 @@
 		tcp_highest_sack_reset(sk);
 
 	found_dup_sack = tcp_check_dsack(sk, ack_skb, sp_wire,
-					 num_sacks, prior_snd_una);
-	if (found_dup_sack) {
-		state->flag |= FLAG_DSACKING_ACK;
-		tp->delivered++; /* A spurious retransmission is delivered */
-	}
+					 num_sacks, prior_snd_una, state);
 
 	/* Eliminate too old ACKs, but take into
 	 * account more or less fresh ones, they can
@@ -1893,7 +1997,7 @@
 
 /* Emulate SACKs for SACKless connection: account for a new dupack. */
 
-static void tcp_add_reno_sack(struct sock *sk, int num_dupack)
+static void tcp_add_reno_sack(struct sock *sk, int num_dupack, bool ece_ack)
 {
 	if (num_dupack) {
 		struct tcp_sock *tp = tcp_sk(sk);
@@ -1904,20 +2008,21 @@
 		tcp_check_reno_reordering(sk, 0);
 		delivered = tp->sacked_out - prior_sacked;
 		if (delivered > 0)
-			tp->delivered += delivered;
+			tcp_count_delivered(tp, delivered, ece_ack);
 		tcp_verify_left_out(tp);
 	}
 }
 
 /* Account for ACK, ACKing some data in Reno Recovery phase. */
 
-static void tcp_remove_reno_sacks(struct sock *sk, int acked)
+static void tcp_remove_reno_sacks(struct sock *sk, int acked, bool ece_ack)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	if (acked > 0) {
 		/* One ACK acked hole. The rest eat duplicate ACKs. */
-		tp->delivered += max_t(int, acked - tp->sacked_out, 1);
+		tcp_count_delivered(tp, max_t(int, acked - tp->sacked_out, 1),
+				    ece_ack);
 		if (acked - 1 >= tp->sacked_out)
 			tp->sacked_out = 0;
 		else
@@ -2184,8 +2289,7 @@
 }
 
 /* Detect loss in event "A" above by marking head of queue up as lost.
- * For non-SACK(Reno) senders, the first "packets" number of segments
- * are considered lost. For RFC3517 SACK, a segment is considered lost if it
+ * For RFC3517 SACK, a segment is considered lost if it
  * has at least tp->reordering SACKed seqments above it; "packets" refers to
  * the maximum SACKed segments to pass before reaching this limit.
  */
@@ -2193,10 +2297,9 @@
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct sk_buff *skb;
-	int cnt, oldcnt, lost;
-	unsigned int mss;
+	int cnt;
 	/* Use SACK to deduce losses of new sequences sent during recovery */
-	const u32 loss_high = tcp_is_sack(tp) ?  tp->snd_nxt : tp->high_seq;
+	const u32 loss_high = tp->snd_nxt;
 
 	WARN_ON(packets > tp->packets_out);
 	skb = tp->lost_skb_hint;
@@ -2219,28 +2322,14 @@
 		if (after(TCP_SKB_CB(skb)->end_seq, loss_high))
 			break;
 
-		oldcnt = cnt;
-		if (tcp_is_reno(tp) ||
-		    (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED))
+		if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)
 			cnt += tcp_skb_pcount(skb);
 
-		if (cnt > packets) {
-			if (tcp_is_sack(tp) ||
-			    (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED) ||
-			    (oldcnt >= packets))
-				break;
+		if (cnt > packets)
+			break;
 
-			mss = tcp_skb_mss(skb);
-			/* If needed, chop off the prefix to mark as lost. */
-			lost = (packets - oldcnt) * mss;
-			if (lost < skb->len &&
-			    tcp_fragment(sk, TCP_FRAG_IN_RTX_QUEUE, skb,
-					 lost, mss, GFP_ATOMIC) < 0)
-				break;
-			cnt = packets;
-		}
-
-		tcp_skb_mark_lost(tp, skb);
+		if (!(TCP_SKB_CB(skb)->sacked & TCPCB_LOST))
+			tcp_mark_skb_lost(sk, skb);
 
 		if (mark_head)
 			break;
@@ -2606,14 +2695,8 @@
 	unsigned int mss = tcp_current_mss(sk);
 
 	skb_rbtree_walk(skb, &sk->tcp_rtx_queue) {
-		if (tcp_skb_seglen(skb) > mss &&
-		    !(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) {
-			if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) {
-				TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS;
-				tp->retrans_out -= tcp_skb_pcount(skb);
-			}
-			tcp_skb_mark_lost_uncond_verify(tp, skb);
-		}
+		if (tcp_skb_seglen(skb) > mss)
+			tcp_mark_skb_lost(sk, skb);
 	}
 
 	tcp_clear_retrans_hints_partial(tp);
@@ -2714,15 +2797,24 @@
 		 * delivered. Lower inflight to clock out (re)tranmissions.
 		 */
 		if (after(tp->snd_nxt, tp->high_seq) && num_dupack)
-			tcp_add_reno_sack(sk, num_dupack);
+			tcp_add_reno_sack(sk, num_dupack, flag & FLAG_ECE);
 		else if (flag & FLAG_SND_UNA_ADVANCED)
 			tcp_reset_reno_sack(tp);
 	}
 	*rexmit = REXMIT_LOST;
 }
 
+static bool tcp_force_fast_retransmit(struct sock *sk)
+{
+	struct tcp_sock *tp = tcp_sk(sk);
+
+	return after(tcp_highest_sack_seq(tp),
+		     tp->snd_una + tp->reordering * tp->mss_cache);
+}
+
 /* Undo during fast recovery after partial ACK. */
-static bool tcp_try_undo_partial(struct sock *sk, u32 prior_snd_una)
+static bool tcp_try_undo_partial(struct sock *sk, u32 prior_snd_una,
+				 bool *do_lost)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
@@ -2747,7 +2839,9 @@
 		tcp_undo_cwnd_reduction(sk, true);
 		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPPARTIALUNDO);
 		tcp_try_keep_open(sk);
-		return true;
+	} else {
+		/* Partial ACK arrived. Force fast retransmit. */
+		*do_lost = tcp_force_fast_retransmit(sk);
 	}
 	return false;
 }
@@ -2771,14 +2865,6 @@
 	}
 }
 
-static bool tcp_force_fast_retransmit(struct sock *sk)
-{
-	struct tcp_sock *tp = tcp_sk(sk);
-
-	return after(tcp_highest_sack_seq(tp),
-		     tp->snd_una + tp->reordering * tp->mss_cache);
-}
-
 /* Process an event, which can update packets-in-flight not trivially.
  * Main goal of this function is to calculate new estimate for left_out,
  * taking into account both packets sitting in receiver's buffer and
@@ -2797,6 +2883,7 @@
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
 	int fast_rexmit = 0, flag = *ack_flag;
+	bool ece_ack = flag & FLAG_ECE;
 	bool do_lost = num_dupack || ((flag & FLAG_DATA_SACKED) &&
 				      tcp_force_fast_retransmit(sk));
 
@@ -2805,7 +2892,7 @@
 
 	/* Now state machine starts.
 	 * A. ECE, hence prohibit cwnd undoing, the reduction is required. */
-	if (flag & FLAG_ECE)
+	if (ece_ack)
 		tp->prior_ssthresh = 0;
 
 	/* B. In all the states check for reneging SACKs. */
@@ -2846,19 +2933,22 @@
 	case TCP_CA_Recovery:
 		if (!(flag & FLAG_SND_UNA_ADVANCED)) {
 			if (tcp_is_reno(tp))
-				tcp_add_reno_sack(sk, num_dupack);
-		} else {
-			if (tcp_try_undo_partial(sk, prior_snd_una))
-				return;
-			/* Partial ACK arrived. Force fast retransmit. */
-			do_lost = tcp_is_reno(tp) ||
-				  tcp_force_fast_retransmit(sk);
-		}
-		if (tcp_try_undo_dsack(sk)) {
-			tcp_try_keep_open(sk);
+				tcp_add_reno_sack(sk, num_dupack, ece_ack);
+		} else if (tcp_try_undo_partial(sk, prior_snd_una, &do_lost))
 			return;
-		}
+
+		if (tcp_try_undo_dsack(sk))
+			tcp_try_keep_open(sk);
+
 		tcp_identify_packet_loss(sk, ack_flag);
+		if (icsk->icsk_ca_state != TCP_CA_Recovery) {
+			if (!tcp_time_to_recover(sk, flag))
+				return;
+			/* Undo reverts the recovery state. If loss is evident,
+			 * starts a new recovery (e.g. reordering then loss);
+			 */
+			tcp_enter_recovery(sk, ece_ack);
+		}
 		break;
 	case TCP_CA_Loss:
 		tcp_process_loss(sk, flag, num_dupack, rexmit);
@@ -2867,12 +2957,12 @@
 		      (*ack_flag & FLAG_LOST_RETRANS)))
 			return;
 		/* Change state if cwnd is undone or retransmits are lost */
-		/* fall through */
+		fallthrough;
 	default:
 		if (tcp_is_reno(tp)) {
 			if (flag & FLAG_SND_UNA_ADVANCED)
 				tcp_reset_reno_sack(tp);
-			tcp_add_reno_sack(sk, num_dupack);
+			tcp_add_reno_sack(sk, num_dupack, ece_ack);
 		}
 
 		if (icsk->icsk_ca_state <= TCP_CA_Disorder)
@@ -2896,7 +2986,7 @@
 		}
 
 		/* Otherwise enter Recovery state */
-		tcp_enter_recovery(sk, (flag & FLAG_ECE));
+		tcp_enter_recovery(sk, ece_ack);
 		fast_rexmit = 1;
 	}
 
@@ -3018,7 +3108,7 @@
 			rto = usecs_to_jiffies(max_t(int, delta_us, 1));
 		}
 		tcp_reset_xmit_timer(sk, ICSK_TIME_RETRANS, rto,
-				     TCP_RTO_MAX, tcp_rtx_queue_head(sk));
+				     TCP_RTO_MAX);
 	}
 }
 
@@ -3074,7 +3164,7 @@
  */
 static int tcp_clean_rtx_queue(struct sock *sk, u32 prior_fack,
 			       u32 prior_snd_una,
-			       struct tcp_sacktag_state *sack)
+			       struct tcp_sacktag_state *sack, bool ece_ack)
 {
 	const struct inet_connection_sock *icsk = inet_csk(sk);
 	u64 first_ackt, last_ackt;
@@ -3099,8 +3189,6 @@
 		u8 sacked = scb->sacked;
 		u32 acked_pcount;
 
-		tcp_ack_tstamp(sk, skb, prior_snd_una);
-
 		/* Determine how many packets and what bytes were acked, tso and else */
 		if (after(scb->end_seq, tp->snd_una)) {
 			if (tcp_skb_pcount(skb) == 1 ||
@@ -3135,7 +3223,7 @@
 		if (sacked & TCPCB_SACKED_ACKED) {
 			tp->sacked_out -= acked_pcount;
 		} else if (tcp_is_sack(tp)) {
-			tp->delivered += acked_pcount;
+			tcp_count_delivered(tp, acked_pcount, ece_ack);
 			if (!tcp_skb_spurious_retrans(tp, skb))
 				tcp_rack_advance(tp, sacked, scb->end_seq,
 						 tcp_skb_timestamp_us(skb));
@@ -3164,6 +3252,8 @@
 		if (!fully_acked)
 			break;
 
+		tcp_ack_tstamp(sk, skb, prior_snd_una);
+
 		next = skb_rb_next(skb);
 		if (unlikely(skb == tp->retransmit_skb_hint))
 			tp->retransmit_skb_hint = NULL;
@@ -3179,8 +3269,11 @@
 	if (likely(between(tp->snd_up, prior_snd_una, tp->snd_una)))
 		tp->snd_up = tp->snd_una;
 
-	if (skb && (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED))
-		flag |= FLAG_SACK_RENEGING;
+	if (skb) {
+		tcp_ack_tstamp(sk, skb, prior_snd_una);
+		if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)
+			flag |= FLAG_SACK_RENEGING;
+	}
 
 	if (likely(first_ackt) && !(flag & FLAG_RETRANS_DATA_ACKED)) {
 		seq_rtt_us = tcp_stamp_us_delta(tp->tcp_mstamp, first_ackt);
@@ -3212,7 +3305,7 @@
 		}
 
 		if (tcp_is_reno(tp)) {
-			tcp_remove_reno_sacks(sk, pkts_acked);
+			tcp_remove_reno_sacks(sk, pkts_acked, ece_ack);
 
 			/* If any of the cumulatively ACKed segments was
 			 * retransmitted, non-SACK case cannot confirm that
@@ -3296,8 +3389,7 @@
 		unsigned long when = tcp_probe0_when(sk, TCP_RTO_MAX);
 
 		when = tcp_clamp_probe0_to_user_timeout(sk, when);
-		tcp_reset_xmit_timer(sk, ICSK_TIME_PROBE0,
-				     when, TCP_RTO_MAX, NULL);
+		tcp_reset_xmit_timer(sk, ICSK_TIME_PROBE0, when, TCP_RTO_MAX);
 	}
 }
 
@@ -3563,7 +3655,7 @@
 	if (rexmit == REXMIT_NONE || sk->sk_state == TCP_SYN_SENT)
 		return;
 
-	if (unlikely(rexmit == 2)) {
+	if (unlikely(rexmit == REXMIT_NEW)) {
 		__tcp_push_pending_frames(sk, tcp_current_mss(sk),
 					  TCP_NAGLE_OFF);
 		if (after(tp->snd_nxt, tp->high_seq))
@@ -3582,10 +3674,9 @@
 
 	delivered = tp->delivered - prior_delivered;
 	NET_ADD_STATS(net, LINUX_MIB_TCPDELIVERED, delivered);
-	if (flag & FLAG_ECE) {
-		tp->delivered_ce += delivered;
+	if (flag & FLAG_ECE)
 		NET_ADD_STATS(net, LINUX_MIB_TCPDELIVEREDCE, delivered);
-	}
+
 	return delivered;
 }
 
@@ -3609,6 +3700,7 @@
 
 	sack_state.first_sackt = 0;
 	sack_state.rate = &rs;
+	sack_state.sack_delivered = 0;
 
 	/* We very likely will need to access rtx queue. */
 	prefetch(sk->tcp_rtx_queue.rb_node);
@@ -3684,6 +3776,10 @@
 			ack_ev_flags |= CA_ACK_ECE;
 		}
 
+		if (sack_state.sack_delivered)
+			tcp_count_delivered(tp, sack_state.sack_delivered,
+					    flag & FLAG_ECE);
+
 		if (flag & FLAG_WIN_UPDATE)
 			ack_ev_flags |= CA_ACK_WIN_UPDATE;
 
@@ -3709,7 +3805,8 @@
 		goto no_queue;
 
 	/* See if we can take anything off of the retransmit queue. */
-	flag |= tcp_clean_rtx_queue(sk, prior_fack, prior_snd_una, &sack_state);
+	flag |= tcp_clean_rtx_queue(sk, prior_fack, prior_snd_una, &sack_state,
+				    flag & FLAG_ECE);
 
 	tcp_rack_update_reo_wnd(sk, &rs);
 
@@ -3792,7 +3889,7 @@
 	foc->exp = exp_opt;
 }
 
-static void smc_parse_options(const struct tcphdr *th,
+static bool smc_parse_options(const struct tcphdr *th,
 			      struct tcp_options_received *opt_rx,
 			      const unsigned char *ptr,
 			      int opsize)
@@ -3801,10 +3898,13 @@
 	if (static_branch_unlikely(&tcp_have_smc)) {
 		if (th->syn && !(opsize & 1) &&
 		    opsize >= TCPOLEN_EXP_SMC_BASE &&
-		    get_unaligned_be32(ptr) == TCPOPT_SMC_MAGIC)
+		    get_unaligned_be32(ptr) == TCPOPT_SMC_MAGIC) {
 			opt_rx->smc_ok = 1;
+			return true;
+		}
 	}
 #endif
+	return false;
 }
 
 /* Try to parse the MSS option from the TCP header. Return 0 on failure, clamped
@@ -3865,6 +3965,7 @@
 
 	ptr = (const unsigned char *)(th + 1);
 	opt_rx->saw_tstamp = 0;
+	opt_rx->saw_unknown = 0;
 
 	while (length > 0) {
 		int opcode = *ptr++;
@@ -3955,15 +4056,21 @@
 				 */
 				if (opsize >= TCPOLEN_EXP_FASTOPEN_BASE &&
 				    get_unaligned_be16(ptr) ==
-				    TCPOPT_FASTOPEN_MAGIC)
+				    TCPOPT_FASTOPEN_MAGIC) {
 					tcp_parse_fastopen_option(opsize -
 						TCPOLEN_EXP_FASTOPEN_BASE,
 						ptr + 2, th->syn, foc, true);
-				else
-					smc_parse_options(th, opt_rx, ptr,
-							  opsize);
+					break;
+				}
+
+				if (smc_parse_options(th, opt_rx, ptr, opsize))
+					break;
+
+				opt_rx->saw_unknown = 1;
 				break;
 
+			default:
+				opt_rx->saw_unknown = 1;
 			}
 			ptr += opsize-2;
 			length -= opsize;
@@ -4284,8 +4391,9 @@
 	 * The receiver remembers and reflects via DSACKs. Leverage the
 	 * DSACK state and change the txhash to re-route speculatively.
 	 */
-	if (TCP_SKB_CB(skb)->seq == tcp_sk(sk)->duplicate_sack[0].start_seq)
-		sk_rethink_txhash(sk);
+	if (TCP_SKB_CB(skb)->seq == tcp_sk(sk)->duplicate_sack[0].start_seq &&
+	    sk_rethink_txhash(sk))
+		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPDUPLICATEDATAREHASH);
 }
 
 static void tcp_send_dupack(struct sock *sk, const struct sk_buff *skb)
@@ -4334,10 +4442,38 @@
 				sp[i] = sp[i + 1];
 			continue;
 		}
-		this_sack++, swalk++;
+		this_sack++;
+		swalk++;
 	}
 }
 
+static void tcp_sack_compress_send_ack(struct sock *sk)
+{
+	struct tcp_sock *tp = tcp_sk(sk);
+
+	if (!tp->compressed_ack)
+		return;
+
+	if (hrtimer_try_to_cancel(&tp->compressed_ack_timer) == 1)
+		__sock_put(sk);
+
+	/* Since we have to send one ack finally,
+	 * substract one from tp->compressed_ack to keep
+	 * LINUX_MIB_TCPACKCOMPRESSED accurate.
+	 */
+	NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPACKCOMPRESSED,
+		      tp->compressed_ack - 1);
+
+	tp->compressed_ack = 0;
+	tcp_send_ack(sk);
+}
+
+/* Reasonable amount of sack blocks included in TCP SACK option
+ * The max is 4, but this becomes 3 if TCP timestamps are there.
+ * Given that SACK packets might be lost, be conservative and use 2.
+ */
+#define TCP_SACK_BLOCKS_EXPECTED 2
+
 static void tcp_sack_new_ofo_skb(struct sock *sk, u32 seq, u32 end_seq)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -4350,6 +4486,8 @@
 
 	for (this_sack = 0; this_sack < cur_sacks; this_sack++, sp++) {
 		if (tcp_sack_extend(sp, seq, end_seq)) {
+			if (this_sack >= TCP_SACK_BLOCKS_EXPECTED)
+				tcp_sack_compress_send_ack(sk);
 			/* Rotate this_sack to the first one. */
 			for (; this_sack > 0; this_sack--, sp--)
 				swap(*sp, *(sp - 1));
@@ -4359,6 +4497,9 @@
 		}
 	}
 
+	if (this_sack >= TCP_SACK_BLOCKS_EXPECTED)
+		tcp_sack_compress_send_ack(sk);
+
 	/* Could not find an adjacent existing SACK, build a new one,
 	 * put it at the front, and shift everyone else down.  We
 	 * always know there is at least one SACK present already here.
@@ -4366,8 +4507,6 @@
 	 * If the sack array is full, forget about the last one.
 	 */
 	if (this_sack >= TCP_NUM_SACKS) {
-		if (tp->compressed_ack > TCP_FASTRETRANS_THRESH)
-			tcp_send_ack(sk);
 		this_sack--;
 		tp->rx_opt.num_sacks--;
 		sp--;
@@ -4419,7 +4558,6 @@
 /**
  * tcp_try_coalesce - try to merge skb to prior one
  * @sk: socket
- * @dest: destination queue
  * @to: prior buffer
  * @from: buffer to add in queue
  * @fragstolen: pointer to boolean
@@ -4443,6 +4581,9 @@
 	if (TCP_SKB_CB(from)->seq != TCP_SKB_CB(to)->end_seq)
 		return false;
 
+	if (!mptcp_skb_can_collapse(to, from))
+		return false;
+
 #ifdef CONFIG_TLS_DEVICE
 	if (from->decrypted != to->decrypted)
 		return false;
@@ -4792,6 +4933,9 @@
 	bool fragstolen;
 	int eaten;
 
+	if (sk_is_mptcp(sk))
+		mptcp_incoming_options(sk, skb);
+
 	if (TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq) {
 		__kfree_skb(skb);
 		return;
@@ -4962,7 +5106,7 @@
 		/* The first skb to collapse is:
 		 * - not SYN/FIN and
 		 * - bloated or contains data before "start" or
-		 *   overlaps to the next one.
+		 *   overlaps to the next one and mptcp allow collapsing.
 		 */
 		if (!(TCP_SKB_CB(skb)->tcp_flags & (TCPHDR_SYN | TCPHDR_FIN)) &&
 		    (tcp_win_from_space(sk, skb->truesize) > skb->len ||
@@ -4971,7 +5115,7 @@
 			break;
 		}
 
-		if (n && n != tail &&
+		if (n && n != tail && mptcp_skb_can_collapse(skb, n) &&
 		    TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(n)->seq) {
 			end_of_skbs = false;
 			break;
@@ -5004,6 +5148,7 @@
 		else
 			__skb_queue_tail(&tmp, nskb); /* defer rbtree insertion */
 		skb_set_owner_r(nskb, sk);
+		mptcp_skb_ext_move(nskb, skb);
 
 		/* Copy data, releasing collapsed skbs. */
 		while (copy > 0) {
@@ -5023,6 +5168,7 @@
 				skb = tcp_collapse_one(sk, skb, list, root);
 				if (!skb ||
 				    skb == tail ||
+				    !mptcp_skb_can_collapse(nskb, skb) ||
 				    (TCP_SKB_CB(skb)->tcp_flags & (TCPHDR_SYN | TCPHDR_FIN)))
 					goto end;
 #ifdef CONFIG_TLS_DEVICE
@@ -5212,12 +5358,6 @@
 	return true;
 }
 
-/* When incoming ACK allowed to free some skb from write_queue,
- * we remember this event in flag SOCK_QUEUE_SHRUNK and wake up socket
- * on the exit from tcp input handler.
- *
- * PROBLEM: sndbuf expansion does not work well with largesend.
- */
 static void tcp_new_space(struct sock *sk)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -5232,16 +5372,13 @@
 
 static void tcp_check_space(struct sock *sk)
 {
-	if (sock_flag(sk, SOCK_QUEUE_SHRUNK)) {
-		sock_reset_flag(sk, SOCK_QUEUE_SHRUNK);
-		/* pairs with tcp_poll() */
-		smp_mb();
-		if (sk->sk_socket &&
-		    test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
-			tcp_new_space(sk);
-			if (!test_bit(SOCK_NOSPACE, &sk->sk_socket->flags))
-				tcp_chrono_stop(sk, TCP_CHRONO_SNDBUF_LIMITED);
-		}
+	/* pairs with tcp_poll() */
+	smp_mb();
+	if (sk->sk_socket &&
+	    test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
+		tcp_new_space(sk);
+		if (!test_bit(SOCK_NOSPACE, &sk->sk_socket->flags))
+			tcp_chrono_stop(sk, TCP_CHRONO_SNDBUF_LIMITED);
 	}
 }
 
@@ -5288,15 +5425,13 @@
 
 	if (tp->compressed_ack_rcv_nxt != tp->rcv_nxt) {
 		tp->compressed_ack_rcv_nxt = tp->rcv_nxt;
-		if (tp->compressed_ack > TCP_FASTRETRANS_THRESH)
-			NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPACKCOMPRESSED,
-				      tp->compressed_ack - TCP_FASTRETRANS_THRESH);
-		tp->compressed_ack = 0;
+		tp->dup_ack_counter = 0;
 	}
-
-	if (++tp->compressed_ack <= TCP_FASTRETRANS_THRESH)
+	if (tp->dup_ack_counter < TCP_FASTRETRANS_THRESH) {
+		tp->dup_ack_counter++;
 		goto send_now;
-
+	}
+	tp->compressed_ack++;
 	if (hrtimer_is_queued(&tp->compressed_ack_timer))
 		return;
 
@@ -5309,8 +5444,9 @@
 	delay = min_t(unsigned long, sock_net(sk)->ipv4.sysctl_tcp_comp_sack_delay_ns,
 		      rtt * (NSEC_PER_USEC >> 3)/20);
 	sock_hold(sk);
-	hrtimer_start(&tp->compressed_ack_timer, ns_to_ktime(delay),
-		      HRTIMER_MODE_REL_PINNED_SOFT);
+	hrtimer_start_range_ns(&tp->compressed_ack_timer, ns_to_ktime(delay),
+			       sock_net(sk)->ipv4.sysctl_tcp_comp_sack_slack_ns,
+			       HRTIMER_MODE_REL_PINNED_SOFT);
 }
 
 static inline void tcp_ack_snd_check(struct sock *sk)
@@ -5544,6 +5680,8 @@
 		goto discard;
 	}
 
+	bpf_skops_parse_hdr(sk, skb);
+
 	return true;
 
 discard:
@@ -5754,7 +5892,7 @@
 }
 EXPORT_SYMBOL(tcp_rcv_established);
 
-void tcp_init_transfer(struct sock *sk, int bpf_op)
+void tcp_init_transfer(struct sock *sk, int bpf_op, struct sk_buff *skb)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -5775,8 +5913,10 @@
 		tp->snd_cwnd = tcp_init_cwnd(tp, __sk_dst_get(sk));
 	tp->snd_cwnd_stamp = tcp_jiffies32;
 
-	tcp_call_bpf(sk, bpf_op, 0, NULL);
-	tcp_init_congestion_control(sk);
+	bpf_skops_established(sk, bpf_op, skb);
+	/* Initialize congestion control unless BPF initialized it already: */
+	if (!icsk->icsk_ca_initialized)
+		tcp_init_congestion_control(sk);
 	tcp_init_buffer_space(sk);
 }
 
@@ -5794,7 +5934,7 @@
 		sk_mark_napi_id(sk, skb);
 	}
 
-	tcp_init_transfer(sk, BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB);
+	tcp_init_transfer(sk, BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB, skb);
 
 	/* Prevent spurious tcp_cwnd_restart() on first data
 	 * packet.
@@ -5849,6 +5989,10 @@
 	tcp_fastopen_cache_set(sk, mss, cookie, syn_drop, try_exp);
 
 	if (data) { /* Retransmit unacked data in SYN */
+		if (tp->total_retrans)
+			tp->fastopen_client_fail = TFO_SYN_RETRANSMITTED;
+		else
+			tp->fastopen_client_fail = TFO_DATA_NOT_ACKED;
 		skb_rbtree_walk_from(data) {
 			if (__tcp_retransmit_skb(sk, data, 1))
 				break;
@@ -5919,8 +6063,14 @@
 		 *        the segment and return)"
 		 */
 		if (!after(TCP_SKB_CB(skb)->ack_seq, tp->snd_una) ||
-		    after(TCP_SKB_CB(skb)->ack_seq, tp->snd_nxt))
+		    after(TCP_SKB_CB(skb)->ack_seq, tp->snd_nxt)) {
+			/* Previous FIN/ACK or RST/ACK might be ignored. */
+			if (icsk->icsk_retransmits == 0)
+				inet_csk_reset_xmit_timer(sk,
+						ICSK_TIME_RETRANS,
+						TCP_TIMEOUT_MIN, TCP_RTO_MAX);
 			goto reset_and_undo;
+		}
 
 		if (tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr &&
 		    !between(tp->rx_opt.rcv_tsecr, tp->retrans_stamp,
@@ -6256,7 +6406,8 @@
 		} else {
 			tcp_try_undo_spurious_syn(sk);
 			tp->retrans_stamp = 0;
-			tcp_init_transfer(sk, BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB);
+			tcp_init_transfer(sk, BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB,
+					  skb);
 			WRITE_ONCE(tp->copied_seq, tp->rcv_nxt);
 		}
 		smp_mb();
@@ -6364,9 +6515,12 @@
 	case TCP_CLOSE_WAIT:
 	case TCP_CLOSING:
 	case TCP_LAST_ACK:
-		if (!before(TCP_SKB_CB(skb)->seq, tp->rcv_nxt))
+		if (!before(TCP_SKB_CB(skb)->seq, tp->rcv_nxt)) {
+			if (sk_is_mptcp(sk))
+				mptcp_incoming_options(sk, skb);
 			break;
-		/* fall through */
+		}
+		fallthrough;
 	case TCP_FIN_WAIT1:
 	case TCP_FIN_WAIT2:
 		/* RFC 793 says to queue data in these states,
@@ -6381,7 +6535,7 @@
 				return 1;
 			}
 		}
-		/* Fall through */
+		fallthrough;
 	case TCP_ESTABLISHED:
 		tcp_data_queue(sk, skb);
 		queued = 1;
@@ -6464,7 +6618,6 @@
 	struct inet_request_sock *ireq = inet_rsk(req);
 
 	req->rsk_rcv_wnd = 0;		/* So that tcp_send_synack() knows! */
-	req->cookie_ts = 0;
 	tcp_rsk(req)->rcv_isn = TCP_SKB_CB(skb)->seq;
 	tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->seq + 1;
 	tcp_rsk(req)->snt_synack = 0;
@@ -6543,13 +6696,27 @@
 {
 	if (tcp_sk(sk)->save_syn) {
 		u32 len = skb_network_header_len(skb) + tcp_hdrlen(skb);
-		u32 *copy;
+		struct saved_syn *saved_syn;
+		u32 mac_hdrlen;
+		void *base;
 
-		copy = kmalloc(len + sizeof(u32), GFP_ATOMIC);
-		if (copy) {
-			copy[0] = len;
-			memcpy(&copy[1], skb_network_header(skb), len);
-			req->saved_syn = copy;
+		if (tcp_sk(sk)->save_syn == 2) {  /* Save full header. */
+			base = skb_mac_header(skb);
+			mac_hdrlen = skb_mac_header_len(skb);
+			len += mac_hdrlen;
+		} else {
+			base = skb_network_header(skb);
+			mac_hdrlen = 0;
+		}
+
+		saved_syn = kmalloc(struct_size(saved_syn, data, len),
+				    GFP_ATOMIC);
+		if (saved_syn) {
+			saved_syn->mac_hdrlen = mac_hdrlen;
+			saved_syn->network_hdrlen = skb_network_header_len(skb);
+			saved_syn->tcp_hdrlen = tcp_hdrlen(skb);
+			memcpy(saved_syn->data, base, len);
+			req->saved_syn = saved_syn;
 		}
 	}
 }
@@ -6619,8 +6786,12 @@
 	if (!req)
 		goto drop;
 
+	req->syncookie = want_cookie;
 	tcp_rsk(req)->af_specific = af_ops;
 	tcp_rsk(req)->ts_off = 0;
+#if IS_ENABLED(CONFIG_MPTCP)
+	tcp_rsk(req)->is_mptcp = 0;
+#endif
 
 	tcp_clear_options(&tmp_opt);
 	tmp_opt.mss_clamp = af_ops->mss_clamp;
@@ -6678,13 +6849,13 @@
 
 	if (want_cookie) {
 		isn = cookie_init_sequence(af_ops, sk, skb, &req->mss);
-		req->cookie_ts = tmp_opt.tstamp_ok;
 		if (!tmp_opt.tstamp_ok)
 			inet_rsk(req)->ecn_ok = 0;
 	}
 
 	tcp_rsk(req)->snt_isn = isn;
 	tcp_rsk(req)->txhash = net_tx_rndhash();
+	tcp_rsk(req)->syn_tos = TCP_SKB_CB(skb)->ip_dsfield;
 	tcp_openreq_init_rwin(req, sk, dst);
 	sk_rx_queue_set(req_to_sk(req), skb);
 	if (!want_cookie) {
@@ -6693,7 +6864,7 @@
 	}
 	if (fastopen_sk) {
 		af_ops->send_synack(fastopen_sk, dst, &fl, req,
-				    &foc, TCP_SYNACK_FASTOPEN);
+				    &foc, TCP_SYNACK_FASTOPEN, skb);
 		/* Add the child socket directly into the accept queue */
 		if (!inet_csk_reqsk_queue_add(sk, req, fastopen_sk)) {
 			reqsk_fastopen_remove(fastopen_sk, req, false);
@@ -6711,7 +6882,8 @@
 				tcp_timeout_init((struct sock *)req));
 		af_ops->send_synack(sk, dst, &fl, req, &foc,
 				    !want_cookie ? TCP_SYNACK_NORMAL :
-						   TCP_SYNACK_COOKIE);
+						   TCP_SYNACK_COOKIE,
+				    skb);
 		if (want_cookie) {
 			reqsk_free(req);
 			return 0;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 2ce85e5..017cd66 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -76,6 +76,7 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/inetdevice.h>
+#include <linux/btf_ids.h>
 
 #include <crypto/hash.h>
 #include <linux/scatterlist.h>
@@ -121,11 +122,9 @@
 #if IS_ENABLED(CONFIG_IPV6)
 		if (tw->tw_family == AF_INET6) {
 			if (ipv6_addr_loopback(&tw->tw_v6_daddr) ||
-			    (ipv6_addr_v4mapped(&tw->tw_v6_daddr) &&
-			     (tw->tw_v6_daddr.s6_addr[12] == 127)) ||
+			    ipv6_addr_v4mapped_loopback(&tw->tw_v6_daddr) ||
 			    ipv6_addr_loopback(&tw->tw_v6_rcv_saddr) ||
-			    (ipv6_addr_v4mapped(&tw->tw_v6_rcv_saddr) &&
-			     (tw->tw_v6_rcv_saddr.s6_addr[12] == 127)))
+			    ipv6_addr_v4mapped_loopback(&tw->tw_v6_rcv_saddr))
 				loopback = true;
 		} else
 #endif
@@ -405,6 +404,46 @@
 }
 EXPORT_SYMBOL(tcp_req_err);
 
+/* TCP-LD (RFC 6069) logic */
+void tcp_ld_RTO_revert(struct sock *sk, u32 seq)
+{
+	struct inet_connection_sock *icsk = inet_csk(sk);
+	struct tcp_sock *tp = tcp_sk(sk);
+	struct sk_buff *skb;
+	s32 remaining;
+	u32 delta_us;
+
+	if (sock_owned_by_user(sk))
+		return;
+
+	if (seq != tp->snd_una  || !icsk->icsk_retransmits ||
+	    !icsk->icsk_backoff)
+		return;
+
+	skb = tcp_rtx_queue_head(sk);
+	if (WARN_ON_ONCE(!skb))
+		return;
+
+	icsk->icsk_backoff--;
+	icsk->icsk_rto = tp->srtt_us ? __tcp_set_rto(tp) : TCP_TIMEOUT_INIT;
+	icsk->icsk_rto = inet_csk_rto_backoff(icsk, TCP_RTO_MAX);
+
+	tcp_mstamp_refresh(tp);
+	delta_us = (u32)(tp->tcp_mstamp - tcp_skb_timestamp_us(skb));
+	remaining = icsk->icsk_rto - usecs_to_jiffies(delta_us);
+
+	if (remaining > 0) {
+		inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+					  remaining, TCP_RTO_MAX);
+	} else {
+		/* RTO revert clocked out retransmission.
+		 * Will retransmit now.
+		 */
+		tcp_retransmit_timer(sk);
+	}
+}
+EXPORT_SYMBOL(tcp_ld_RTO_revert);
+
 /*
  * This routine is called by the ICMP module when it gets some
  * sort of error condition.  If err < 0 then the socket should
@@ -421,27 +460,23 @@
  *
  */
 
-int tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
+int tcp_v4_err(struct sk_buff *skb, u32 info)
 {
-	const struct iphdr *iph = (const struct iphdr *)icmp_skb->data;
-	struct tcphdr *th = (struct tcphdr *)(icmp_skb->data + (iph->ihl << 2));
-	struct inet_connection_sock *icsk;
+	const struct iphdr *iph = (const struct iphdr *)skb->data;
+	struct tcphdr *th = (struct tcphdr *)(skb->data + (iph->ihl << 2));
 	struct tcp_sock *tp;
 	struct inet_sock *inet;
-	const int type = icmp_hdr(icmp_skb)->type;
-	const int code = icmp_hdr(icmp_skb)->code;
+	const int type = icmp_hdr(skb)->type;
+	const int code = icmp_hdr(skb)->code;
 	struct sock *sk;
-	struct sk_buff *skb;
 	struct request_sock *fastopen;
 	u32 seq, snd_una;
-	s32 remaining;
-	u32 delta_us;
 	int err;
-	struct net *net = dev_net(icmp_skb->dev);
+	struct net *net = dev_net(skb->dev);
 
 	sk = __inet_lookup_established(net, &tcp_hashinfo, iph->daddr,
 				       th->dest, iph->saddr, ntohs(th->source),
-				       inet_iif(icmp_skb), 0);
+				       inet_iif(skb), 0);
 	if (!sk) {
 		__ICMP_INC_STATS(net, ICMP_MIB_INERRORS);
 		return -ENOENT;
@@ -478,7 +513,6 @@
 		goto out;
 	}
 
-	icsk = inet_csk(sk);
 	tp = tcp_sk(sk);
 	/* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */
 	fastopen = rcu_dereference(tp->fastopen_rsk);
@@ -492,7 +526,7 @@
 	switch (type) {
 	case ICMP_REDIRECT:
 		if (!sock_owned_by_user(sk))
-			do_redirect(icmp_skb, sk);
+			do_redirect(skb, sk);
 		goto out;
 	case ICMP_SOURCE_QUENCH:
 		/* Just silently ignore these. */
@@ -523,41 +557,12 @@
 		}
 
 		err = icmp_err_convert[code].errno;
-		/* check if icmp_skb allows revert of backoff
-		 * (see draft-zimmermann-tcp-lcd) */
-		if (code != ICMP_NET_UNREACH && code != ICMP_HOST_UNREACH)
-			break;
-		if (seq != tp->snd_una  || !icsk->icsk_retransmits ||
-		    !icsk->icsk_backoff || fastopen)
-			break;
-
-		if (sock_owned_by_user(sk))
-			break;
-
-		skb = tcp_rtx_queue_head(sk);
-		if (WARN_ON_ONCE(!skb))
-			break;
-
-		icsk->icsk_backoff--;
-		icsk->icsk_rto = tp->srtt_us ? __tcp_set_rto(tp) :
-					       TCP_TIMEOUT_INIT;
-		icsk->icsk_rto = inet_csk_rto_backoff(icsk, TCP_RTO_MAX);
-
-
-		tcp_mstamp_refresh(tp);
-		delta_us = (u32)(tp->tcp_mstamp - tcp_skb_timestamp_us(skb));
-		remaining = icsk->icsk_rto -
-			    usecs_to_jiffies(delta_us);
-
-		if (remaining > 0) {
-			inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
-						  remaining, TCP_RTO_MAX);
-		} else {
-			/* RTO revert clocked out retransmission.
-			 * Will retransmit now */
-			tcp_retransmit_timer(sk);
-		}
-
+		/* check if this ICMP message allows revert of backoff.
+		 * (see RFC 6069)
+		 */
+		if (!fastopen &&
+		    (code == ICMP_NET_UNREACH || code == ICMP_HOST_UNREACH))
+			tcp_ld_RTO_revert(sk, seq);
 		break;
 	case ICMP_TIME_EXCEEDED:
 		err = EHOSTUNREACH;
@@ -570,11 +575,13 @@
 	case TCP_SYN_SENT:
 	case TCP_SYN_RECV:
 		/* Only in fast or simultaneous open. If a fast open socket is
-		 * is already accepted it is treated as a connected one below.
+		 * already accepted it is treated as a connected one below.
 		 */
 		if (fastopen && !fastopen->sk)
 			break;
 
+		ip_icmp_error(sk, skb, err, th->dest, info, (u8 *)th);
+
 		if (!sock_owned_by_user(sk)) {
 			sk->sk_err = err;
 
@@ -703,9 +710,21 @@
 	rcu_read_lock();
 	hash_location = tcp_parse_md5sig_option(th);
 	if (sk && sk_fullsock(sk)) {
-		key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)
-					&ip_hdr(skb)->saddr, AF_INET);
+		const union tcp_md5_addr *addr;
+		int l3index;
+
+		/* sdif set, means packet ingressed via a device
+		 * in an L3 domain and inet_iif is set to it.
+		 */
+		l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0;
+		addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
+		key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
 	} else if (hash_location) {
+		const union tcp_md5_addr *addr;
+		int sdif = tcp_v4_sdif(skb);
+		int dif = inet_iif(skb);
+		int l3index;
+
 		/*
 		 * active side is lost. Try to find listening socket through
 		 * source port, and then find md5 key through listening socket.
@@ -716,14 +735,17 @@
 		sk1 = __inet_lookup_listener(net, &tcp_hashinfo, NULL, 0,
 					     ip_hdr(skb)->saddr,
 					     th->source, ip_hdr(skb)->daddr,
-					     ntohs(th->source), inet_iif(skb),
-					     tcp_v4_sdif(skb));
+					     ntohs(th->source), dif, sdif);
 		/* don't send rst if it can't find key */
 		if (!sk1)
 			goto out;
 
-		key = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *)
-					&ip_hdr(skb)->saddr, AF_INET);
+		/* sdif set, means packet ingressed via a device
+		 * in an L3 domain and dif is set to it.
+		 */
+		l3index = sdif ? dif : 0;
+		addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
+		key = tcp_md5_do_lookup(sk1, l3index, addr, AF_INET);
 		if (!key)
 			goto out;
 
@@ -907,6 +929,9 @@
 static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
 				  struct request_sock *req)
 {
+	const union tcp_md5_addr *addr;
+	int l3index;
+
 	/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
 	 * sk->sk_state == TCP_SYN_RECV -> for Fast Open.
 	 */
@@ -918,14 +943,15 @@
 	 * exception of <SYN> segments, MUST be right-shifted by
 	 * Rcv.Wind.Shift bits:
 	 */
+	addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
+	l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0;
 	tcp_v4_send_ack(sk, skb, seq,
 			tcp_rsk(req)->rcv_nxt,
 			req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
 			tcp_time_stamp_raw() + tcp_rsk(req)->ts_off,
 			req->ts_recent,
 			0,
-			tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->saddr,
-					  AF_INET),
+			tcp_md5_do_lookup(sk, l3index, addr, AF_INET),
 			inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0,
 			ip_hdr(skb)->tos);
 }
@@ -939,26 +965,38 @@
 			      struct flowi *fl,
 			      struct request_sock *req,
 			      struct tcp_fastopen_cookie *foc,
-			      enum tcp_synack_type synack_type)
+			      enum tcp_synack_type synack_type,
+			      struct sk_buff *syn_skb)
 {
 	const struct inet_request_sock *ireq = inet_rsk(req);
 	struct flowi4 fl4;
 	int err = -1;
 	struct sk_buff *skb;
+	u8 tos;
 
 	/* First, grab a route. */
 	if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL)
 		return -1;
 
-	skb = tcp_make_synack(sk, dst, req, foc, synack_type);
+	skb = tcp_make_synack(sk, dst, req, foc, synack_type, syn_skb);
 
 	if (skb) {
 		__tcp_v4_send_check(skb, ireq->ir_loc_addr, ireq->ir_rmt_addr);
 
+		tos = sock_net(sk)->ipv4.sysctl_tcp_reflect_tos ?
+				(tcp_rsk(req)->syn_tos & ~INET_ECN_MASK) |
+				(inet_sk(sk)->tos & INET_ECN_MASK) :
+				inet_sk(sk)->tos;
+
+		if (!INET_ECN_is_capable(tos) &&
+		    tcp_bpf_ca_needs_ecn((struct sock *)req))
+			tos |= INET_ECN_ECT_0;
+
 		rcu_read_lock();
 		err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr,
 					    ireq->ir_rmt_addr,
-					    rcu_dereference(ireq->ireq_opt));
+					    rcu_dereference(ireq->ireq_opt),
+					    tos);
 		rcu_read_unlock();
 		err = net_xmit_eval(err);
 	}
@@ -984,8 +1022,22 @@
 DEFINE_STATIC_KEY_FALSE(tcp_md5_needed);
 EXPORT_SYMBOL(tcp_md5_needed);
 
+static bool better_md5_match(struct tcp_md5sig_key *old, struct tcp_md5sig_key *new)
+{
+	if (!old)
+		return true;
+
+	/* l3index always overrides non-l3index */
+	if (old->l3index && new->l3index == 0)
+		return false;
+	if (old->l3index == 0 && new->l3index)
+		return true;
+
+	return old->prefixlen < new->prefixlen;
+}
+
 /* Find the Key structure for an address.  */
-struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk,
+struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, int l3index,
 					   const union tcp_md5_addr *addr,
 					   int family)
 {
@@ -1002,10 +1054,12 @@
 	if (!md5sig)
 		return NULL;
 
-	hlist_for_each_entry_rcu(key, &md5sig->head, node) {
+	hlist_for_each_entry_rcu(key, &md5sig->head, node,
+				 lockdep_sock_is_held(sk)) {
 		if (key->family != family)
 			continue;
-
+		if (key->l3index && key->l3index != l3index)
+			continue;
 		if (family == AF_INET) {
 			mask = inet_make_mask(key->prefixlen);
 			match = (key->addr.a4.s_addr & mask) ==
@@ -1019,8 +1073,7 @@
 			match = false;
 		}
 
-		if (match && (!best_match ||
-			      key->prefixlen > best_match->prefixlen))
+		if (match && better_md5_match(best_match, key))
 			best_match = key;
 	}
 	return best_match;
@@ -1029,7 +1082,8 @@
 
 static struct tcp_md5sig_key *tcp_md5_do_lookup_exact(const struct sock *sk,
 						      const union tcp_md5_addr *addr,
-						      int family, u8 prefixlen)
+						      int family, u8 prefixlen,
+						      int l3index)
 {
 	const struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_md5sig_key *key;
@@ -1045,9 +1099,12 @@
 	if (family == AF_INET6)
 		size = sizeof(struct in6_addr);
 #endif
-	hlist_for_each_entry_rcu(key, &md5sig->head, node) {
+	hlist_for_each_entry_rcu(key, &md5sig->head, node,
+				 lockdep_sock_is_held(sk)) {
 		if (key->family != family)
 			continue;
+		if (key->l3index != l3index)
+			continue;
 		if (!memcmp(&key->addr, addr, size) &&
 		    key->prefixlen == prefixlen)
 			return key;
@@ -1059,28 +1116,34 @@
 					 const struct sock *addr_sk)
 {
 	const union tcp_md5_addr *addr;
+	int l3index;
 
+	l3index = l3mdev_master_ifindex_by_index(sock_net(sk),
+						 addr_sk->sk_bound_dev_if);
 	addr = (const union tcp_md5_addr *)&addr_sk->sk_daddr;
-	return tcp_md5_do_lookup(sk, addr, AF_INET);
+	return tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
 }
 EXPORT_SYMBOL(tcp_v4_md5_lookup);
 
 /* This can be called on a newly created socket, from other files */
 int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
-		   int family, u8 prefixlen, const u8 *newkey, u8 newkeylen,
-		   gfp_t gfp)
+		   int family, u8 prefixlen, int l3index,
+		   const u8 *newkey, u8 newkeylen, gfp_t gfp)
 {
 	/* Add Key to the list */
 	struct tcp_md5sig_key *key;
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_md5sig_info *md5sig;
 
-	key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen);
+	key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen, l3index);
 	if (key) {
 		/* Pre-existing entry - just update that one.
 		 * Note that the key might be used concurrently.
+		 * data_race() is telling kcsan that we do not care of
+		 * key mismatches, since changing MD5 key on live flows
+		 * can lead to packet drops.
 		 */
-		memcpy(key->key, newkey, newkeylen);
+		data_race(memcpy(key->key, newkey, newkeylen));
 
 		/* Pairs with READ_ONCE() in tcp_md5_hash_key().
 		 * Also note that a reader could catch new key->keylen value
@@ -1116,6 +1179,7 @@
 	key->keylen = newkeylen;
 	key->family = family;
 	key->prefixlen = prefixlen;
+	key->l3index = l3index;
 	memcpy(&key->addr, addr,
 	       (family == AF_INET6) ? sizeof(struct in6_addr) :
 				      sizeof(struct in_addr));
@@ -1125,11 +1189,11 @@
 EXPORT_SYMBOL(tcp_md5_do_add);
 
 int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family,
-		   u8 prefixlen)
+		   u8 prefixlen, int l3index)
 {
 	struct tcp_md5sig_key *key;
 
-	key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen);
+	key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen, l3index);
 	if (!key)
 		return -ENOENT;
 	hlist_del_rcu(&key->node);
@@ -1156,16 +1220,18 @@
 }
 
 static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
-				 char __user *optval, int optlen)
+				 sockptr_t optval, int optlen)
 {
 	struct tcp_md5sig cmd;
 	struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr;
+	const union tcp_md5_addr *addr;
 	u8 prefixlen = 32;
+	int l3index = 0;
 
 	if (optlen < sizeof(cmd))
 		return -EINVAL;
 
-	if (copy_from_user(&cmd, optval, sizeof(cmd)))
+	if (copy_from_sockptr(&cmd, optval, sizeof(cmd)))
 		return -EFAULT;
 
 	if (sin->sin_family != AF_INET)
@@ -1178,16 +1244,34 @@
 			return -EINVAL;
 	}
 
+	if (optname == TCP_MD5SIG_EXT &&
+	    cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX) {
+		struct net_device *dev;
+
+		rcu_read_lock();
+		dev = dev_get_by_index_rcu(sock_net(sk), cmd.tcpm_ifindex);
+		if (dev && netif_is_l3_master(dev))
+			l3index = dev->ifindex;
+
+		rcu_read_unlock();
+
+		/* ok to reference set/not set outside of rcu;
+		 * right now device MUST be an L3 master
+		 */
+		if (!dev || !l3index)
+			return -EINVAL;
+	}
+
+	addr = (union tcp_md5_addr *)&sin->sin_addr.s_addr;
+
 	if (!cmd.tcpm_keylen)
-		return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr,
-				      AF_INET, prefixlen);
+		return tcp_md5_do_del(sk, addr, AF_INET, prefixlen, l3index);
 
 	if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
 		return -EINVAL;
 
-	return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr,
-			      AF_INET, prefixlen, cmd.tcpm_key, cmd.tcpm_keylen,
-			      GFP_KERNEL);
+	return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index,
+			      cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
 }
 
 static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp,
@@ -1297,7 +1381,8 @@
 
 /* Called with rcu_read_lock() */
 static bool tcp_v4_inbound_md5_hash(const struct sock *sk,
-				    const struct sk_buff *skb)
+				    const struct sk_buff *skb,
+				    int dif, int sdif)
 {
 #ifdef CONFIG_TCP_MD5SIG
 	/*
@@ -1312,11 +1397,17 @@
 	struct tcp_md5sig_key *hash_expected;
 	const struct iphdr *iph = ip_hdr(skb);
 	const struct tcphdr *th = tcp_hdr(skb);
-	int genhash;
+	const union tcp_md5_addr *addr;
 	unsigned char newhash[16];
+	int genhash, l3index;
 
-	hash_expected = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr,
-					  AF_INET);
+	/* sdif set, means packet ingressed via a device
+	 * in an L3 domain and dif is set to the l3mdev
+	 */
+	l3index = sdif ? dif : 0;
+
+	addr = (union tcp_md5_addr *)&iph->saddr;
+	hash_expected = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
 	hash_location = tcp_parse_md5sig_option(th);
 
 	/* We've parsed the options - do we have a hash? */
@@ -1342,11 +1433,11 @@
 
 	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
 		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
-		net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n",
+		net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s L3 index %d\n",
 				     &iph->saddr, ntohs(th->source),
 				     &iph->daddr, ntohs(th->dest),
 				     genhash ? " tcp_v4_calc_md5_hash failed"
-				     : "");
+				     : "", l3index);
 		return true;
 	}
 	return false;
@@ -1383,7 +1474,7 @@
 	.syn_ack_timeout =	tcp_syn_ack_timeout,
 };
 
-static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
+const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
 	.mss_clamp	=	TCP_MSS_DEFAULT,
 #ifdef CONFIG_TCP_MD5SIG
 	.req_md5_lookup	=	tcp_v4_md5_lookup,
@@ -1426,11 +1517,14 @@
 				  bool *own_req)
 {
 	struct inet_request_sock *ireq;
+	bool found_dup_sk = false;
 	struct inet_sock *newinet;
 	struct tcp_sock *newtp;
 	struct sock *newsk;
 #ifdef CONFIG_TCP_MD5SIG
+	const union tcp_md5_addr *addr;
 	struct tcp_md5sig_key *key;
+	int l3index;
 #endif
 	struct ip_options_rcu *inet_opt;
 
@@ -1461,6 +1555,12 @@
 		inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen;
 	newinet->inet_id = prandom_u32();
 
+	/* Set ToS of the new socket based upon the value of incoming SYN.
+	 * ECT bits are set later in tcp_init_transfer().
+	 */
+	if (sock_net(sk)->ipv4.sysctl_tcp_reflect_tos)
+		newinet->tos = tcp_rsk(req)->syn_tos & ~INET_ECN_MASK;
+
 	if (!dst) {
 		dst = inet_csk_route_child_sock(sk, newsk, req);
 		if (!dst)
@@ -1478,9 +1578,10 @@
 	tcp_initialize_rcv_mss(newsk);
 
 #ifdef CONFIG_TCP_MD5SIG
+	l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif);
 	/* Copy over the MD5 key from the original socket */
-	key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&newinet->inet_daddr,
-				AF_INET);
+	addr = (union tcp_md5_addr *)&newinet->inet_daddr;
+	key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
 	if (key) {
 		/*
 		 * We're using one, so create a matching key
@@ -1488,20 +1589,30 @@
 		 * memory, then we end up not copying the key
 		 * across. Shucks.
 		 */
-		tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newinet->inet_daddr,
-			       AF_INET, 32, key->key, key->keylen, GFP_ATOMIC);
+		tcp_md5_do_add(newsk, addr, AF_INET, 32, l3index,
+			       key->key, key->keylen, GFP_ATOMIC);
 		sk_nocaps_add(newsk, NETIF_F_GSO_MASK);
 	}
 #endif
 
 	if (__inet_inherit_port(sk, newsk) < 0)
 		goto put_and_exit;
-	*own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
+	*own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash),
+				       &found_dup_sk);
 	if (likely(*own_req)) {
 		tcp_move_syn(newtp, req);
 		ireq->ireq_opt = NULL;
 	} else {
 		newinet->inet_opt = NULL;
+
+		if (!req_unhash && found_dup_sk) {
+			/* This code path should only be executed in the
+			 * syncookie case only
+			 */
+			bh_unlock_sock(newsk);
+			sock_put(newsk);
+			newsk = NULL;
+		}
 	}
 	return newsk;
 
@@ -1820,6 +1931,7 @@
 	struct net *net = dev_net(skb->dev);
 	struct sk_buff *skb_to_free;
 	int sdif = inet_sdif(skb);
+	int dif = inet_iif(skb);
 	const struct iphdr *iph;
 	const struct tcphdr *th;
 	bool refcounted;
@@ -1868,7 +1980,7 @@
 		struct sock *nsk;
 
 		sk = req->rsk_listener;
-		if (unlikely(tcp_v4_inbound_md5_hash(sk, skb))) {
+		if (unlikely(tcp_v4_inbound_md5_hash(sk, skb, dif, sdif))) {
 			sk_drops_add(sk, skb);
 			reqsk_put(req);
 			goto discard_it;
@@ -1926,7 +2038,7 @@
 	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto discard_and_relse;
 
-	if (tcp_v4_inbound_md5_hash(sk, skb))
+	if (tcp_v4_inbound_md5_hash(sk, skb, dif, sdif))
 		goto discard_and_relse;
 
 	nf_reset_ct(skb);
@@ -2024,7 +2136,7 @@
 		}
 	}
 		/* to ACK */
-		/* fall through */
+		fallthrough;
 	case TCP_TW_ACK:
 		tcp_v4_timewait_ack(sk, skb);
 		break;
@@ -2066,10 +2178,6 @@
 	.getsockopt	   = ip_getsockopt,
 	.addr2sockaddr	   = inet_csk_addr2sockaddr,
 	.sockaddr_len	   = sizeof(struct sockaddr_in),
-#ifdef CONFIG_COMPAT
-	.compat_setsockopt = compat_ip_setsockopt,
-	.compat_getsockopt = compat_ip_getsockopt,
-#endif
 	.mtu_reduced	   = tcp_v4_mtu_reduced,
 };
 EXPORT_SYMBOL(ipv4_specific);
@@ -2155,13 +2263,18 @@
  */
 static void *listening_get_next(struct seq_file *seq, void *cur)
 {
-	struct tcp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file));
+	struct tcp_seq_afinfo *afinfo;
 	struct tcp_iter_state *st = seq->private;
 	struct net *net = seq_file_net(seq);
 	struct inet_listen_hashbucket *ilb;
 	struct hlist_nulls_node *node;
 	struct sock *sk = cur;
 
+	if (st->bpf_seq_afinfo)
+		afinfo = st->bpf_seq_afinfo;
+	else
+		afinfo = PDE_DATA(file_inode(seq->file));
+
 	if (!sk) {
 get_head:
 		ilb = &tcp_hashinfo.listening_hash[st->bucket];
@@ -2179,7 +2292,8 @@
 	sk_nulls_for_each_from(sk, node) {
 		if (!net_eq(sock_net(sk), net))
 			continue;
-		if (sk->sk_family == afinfo->family)
+		if (afinfo->family == AF_UNSPEC ||
+		    sk->sk_family == afinfo->family)
 			return sk;
 	}
 	spin_unlock(&ilb->lock);
@@ -2216,11 +2330,16 @@
  */
 static void *established_get_first(struct seq_file *seq)
 {
-	struct tcp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file));
+	struct tcp_seq_afinfo *afinfo;
 	struct tcp_iter_state *st = seq->private;
 	struct net *net = seq_file_net(seq);
 	void *rc = NULL;
 
+	if (st->bpf_seq_afinfo)
+		afinfo = st->bpf_seq_afinfo;
+	else
+		afinfo = PDE_DATA(file_inode(seq->file));
+
 	st->offset = 0;
 	for (; st->bucket <= tcp_hashinfo.ehash_mask; ++st->bucket) {
 		struct sock *sk;
@@ -2233,7 +2352,8 @@
 
 		spin_lock_bh(lock);
 		sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) {
-			if (sk->sk_family != afinfo->family ||
+			if ((afinfo->family != AF_UNSPEC &&
+			     sk->sk_family != afinfo->family) ||
 			    !net_eq(sock_net(sk), net)) {
 				continue;
 			}
@@ -2248,19 +2368,25 @@
 
 static void *established_get_next(struct seq_file *seq, void *cur)
 {
-	struct tcp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file));
+	struct tcp_seq_afinfo *afinfo;
 	struct sock *sk = cur;
 	struct hlist_nulls_node *node;
 	struct tcp_iter_state *st = seq->private;
 	struct net *net = seq_file_net(seq);
 
+	if (st->bpf_seq_afinfo)
+		afinfo = st->bpf_seq_afinfo;
+	else
+		afinfo = PDE_DATA(file_inode(seq->file));
+
 	++st->num;
 	++st->offset;
 
 	sk = sk_nulls_next(sk);
 
 	sk_nulls_for_each_from(sk, node) {
-		if (sk->sk_family == afinfo->family &&
+		if ((afinfo->family == AF_UNSPEC ||
+		     sk->sk_family == afinfo->family) &&
 		    net_eq(sock_net(sk), net))
 			return sk;
 	}
@@ -2321,7 +2447,7 @@
 			break;
 		st->bucket = 0;
 		st->state = TCP_SEQ_STATE_ESTABLISHED;
-		/* Fallthrough */
+		fallthrough;
 	case TCP_SEQ_STATE_ESTABLISHED:
 		if (st->bucket > tcp_hashinfo.ehash_mask)
 			break;
@@ -2465,7 +2591,7 @@
 
 	state = inet_sk_state_load(sk);
 	if (state == TCP_LISTEN)
-		rx_queue = sk->sk_ack_backlog;
+		rx_queue = READ_ONCE(sk->sk_ack_backlog);
 	else
 		/* Because we don't lock the socket,
 		 * we might find a transient negative value.
@@ -2540,6 +2666,74 @@
 	return 0;
 }
 
+#ifdef CONFIG_BPF_SYSCALL
+struct bpf_iter__tcp {
+	__bpf_md_ptr(struct bpf_iter_meta *, meta);
+	__bpf_md_ptr(struct sock_common *, sk_common);
+	uid_t uid __aligned(8);
+};
+
+static int tcp_prog_seq_show(struct bpf_prog *prog, struct bpf_iter_meta *meta,
+			     struct sock_common *sk_common, uid_t uid)
+{
+	struct bpf_iter__tcp ctx;
+
+	meta->seq_num--;  /* skip SEQ_START_TOKEN */
+	ctx.meta = meta;
+	ctx.sk_common = sk_common;
+	ctx.uid = uid;
+	return bpf_iter_run_prog(prog, &ctx);
+}
+
+static int bpf_iter_tcp_seq_show(struct seq_file *seq, void *v)
+{
+	struct bpf_iter_meta meta;
+	struct bpf_prog *prog;
+	struct sock *sk = v;
+	uid_t uid;
+
+	if (v == SEQ_START_TOKEN)
+		return 0;
+
+	if (sk->sk_state == TCP_TIME_WAIT) {
+		uid = 0;
+	} else if (sk->sk_state == TCP_NEW_SYN_RECV) {
+		const struct request_sock *req = v;
+
+		uid = from_kuid_munged(seq_user_ns(seq),
+				       sock_i_uid(req->rsk_listener));
+	} else {
+		uid = from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk));
+	}
+
+	meta.seq = seq;
+	prog = bpf_iter_get_info(&meta, false);
+	return tcp_prog_seq_show(prog, &meta, v, uid);
+}
+
+static void bpf_iter_tcp_seq_stop(struct seq_file *seq, void *v)
+{
+	struct bpf_iter_meta meta;
+	struct bpf_prog *prog;
+
+	if (!v) {
+		meta.seq = seq;
+		prog = bpf_iter_get_info(&meta, true);
+		if (prog)
+			(void)tcp_prog_seq_show(prog, &meta, v, 0);
+	}
+
+	tcp_seq_stop(seq, v);
+}
+
+static const struct seq_operations bpf_iter_tcp_seq_ops = {
+	.show		= bpf_iter_tcp_seq_show,
+	.start		= tcp_seq_start,
+	.next		= tcp_seq_next,
+	.stop		= bpf_iter_tcp_seq_stop,
+};
+#endif
+
 static const struct seq_operations tcp4_seq_ops = {
 	.show		= tcp4_seq_show,
 	.start		= tcp_seq_start,
@@ -2620,10 +2814,6 @@
 	.rsk_prot		= &tcp_request_sock_ops,
 	.h.hashinfo		= &tcp_hashinfo,
 	.no_autobind		= true,
-#ifdef CONFIG_COMPAT
-	.compat_setsockopt	= compat_tcp_setsockopt,
-	.compat_getsockopt	= compat_tcp_getsockopt,
-#endif
 	.diag_destroy		= tcp_abort,
 };
 EXPORT_SYMBOL(tcp_prot);
@@ -2633,7 +2823,8 @@
 	int cpu;
 
 	if (net->ipv4.tcp_congestion_control)
-		module_put(net->ipv4.tcp_congestion_control->owner);
+		bpf_module_put(net->ipv4.tcp_congestion_control,
+			       net->ipv4.tcp_congestion_control->owner);
 
 	for_each_possible_cpu(cpu)
 		inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.tcp_sk, cpu));
@@ -2688,6 +2879,7 @@
 	net->ipv4.sysctl_tcp_fin_timeout = TCP_FIN_TIMEOUT;
 	net->ipv4.sysctl_tcp_notsent_lowat = UINT_MAX;
 	net->ipv4.sysctl_tcp_tw_reuse = 2;
+	net->ipv4.sysctl_tcp_no_ssthresh_metrics_save = 1;
 
 	cnt = tcp_hashinfo.ehash_mask + 1;
 	net->ipv4.tcp_death_row.sysctl_max_tw_buckets = cnt / 2;
@@ -2731,15 +2923,17 @@
 		       sizeof(init_net.ipv4.sysctl_tcp_wmem));
 	}
 	net->ipv4.sysctl_tcp_comp_sack_delay_ns = NSEC_PER_MSEC;
+	net->ipv4.sysctl_tcp_comp_sack_slack_ns = 100 * NSEC_PER_USEC;
 	net->ipv4.sysctl_tcp_comp_sack_nr = 44;
 	net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE;
 	spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock);
-	net->ipv4.sysctl_tcp_fastopen_blackhole_timeout = 60 * 60;
+	net->ipv4.sysctl_tcp_fastopen_blackhole_timeout = 0;
 	atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 
 	/* Reno is always built in */
 	if (!net_eq(net, &init_net) &&
-	    try_module_get(init_net.ipv4.tcp_congestion_control->owner))
+	    bpf_try_module_get(init_net.ipv4.tcp_congestion_control,
+			       init_net.ipv4.tcp_congestion_control->owner))
 		net->ipv4.tcp_congestion_control = init_net.ipv4.tcp_congestion_control;
 	else
 		net->ipv4.tcp_congestion_control = &tcp_reno;
@@ -2767,8 +2961,68 @@
        .exit_batch = tcp_sk_exit_batch,
 };
 
+#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
+DEFINE_BPF_ITER_FUNC(tcp, struct bpf_iter_meta *meta,
+		     struct sock_common *sk_common, uid_t uid)
+
+static int bpf_iter_init_tcp(void *priv_data, struct bpf_iter_aux_info *aux)
+{
+	struct tcp_iter_state *st = priv_data;
+	struct tcp_seq_afinfo *afinfo;
+	int ret;
+
+	afinfo = kmalloc(sizeof(*afinfo), GFP_USER | __GFP_NOWARN);
+	if (!afinfo)
+		return -ENOMEM;
+
+	afinfo->family = AF_UNSPEC;
+	st->bpf_seq_afinfo = afinfo;
+	ret = bpf_iter_init_seq_net(priv_data, aux);
+	if (ret)
+		kfree(afinfo);
+	return ret;
+}
+
+static void bpf_iter_fini_tcp(void *priv_data)
+{
+	struct tcp_iter_state *st = priv_data;
+
+	kfree(st->bpf_seq_afinfo);
+	bpf_iter_fini_seq_net(priv_data);
+}
+
+static const struct bpf_iter_seq_info tcp_seq_info = {
+	.seq_ops		= &bpf_iter_tcp_seq_ops,
+	.init_seq_private	= bpf_iter_init_tcp,
+	.fini_seq_private	= bpf_iter_fini_tcp,
+	.seq_priv_size		= sizeof(struct tcp_iter_state),
+};
+
+static struct bpf_iter_reg tcp_reg_info = {
+	.target			= "tcp",
+	.ctx_arg_info_size	= 1,
+	.ctx_arg_info		= {
+		{ offsetof(struct bpf_iter__tcp, sk_common),
+		  PTR_TO_BTF_ID_OR_NULL },
+	},
+	.seq_info		= &tcp_seq_info,
+};
+
+static void __init bpf_iter_register(void)
+{
+	tcp_reg_info.ctx_arg_info[0].btf_id = btf_sock_ids[BTF_SOCK_TYPE_SOCK_COMMON];
+	if (bpf_iter_reg_target(&tcp_reg_info))
+		pr_warn("Warning: could not register bpf iterator tcp\n");
+}
+
+#endif
+
 void __init tcp_v4_init(void)
 {
 	if (register_pernet_subsys(&tcp_sk_ops))
 		panic("Failed to create the TCP control socket.\n");
+
+#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
+	bpf_iter_register();
+#endif
 }
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index c4848e7..6b27c48 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -385,7 +385,8 @@
 
 	if (tcp_in_initial_slowstart(tp)) {
 		/* Slow start still did not finish. */
-		if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
+		if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save &&
+		    !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
 			val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
 			if (val && (tp->snd_cwnd >> 1) > val)
 				tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
@@ -400,7 +401,8 @@
 	} else if (!tcp_in_slow_start(tp) &&
 		   icsk->icsk_ca_state == TCP_CA_Open) {
 		/* Cong. avoidance phase, cwnd is reliable. */
-		if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH))
+		if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save &&
+		    !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH))
 			tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
 				       max(tp->snd_cwnd >> 1, tp->snd_ssthresh));
 		if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) {
@@ -416,7 +418,8 @@
 			tcp_metric_set(tm, TCP_METRIC_CWND,
 				       (val + tp->snd_ssthresh) >> 1);
 		}
-		if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
+		if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save &&
+		    !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
 			val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
 			if (val && tp->snd_ssthresh > val)
 				tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
@@ -441,6 +444,7 @@
 {
 	struct dst_entry *dst = __sk_dst_get(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
+	struct net *net = sock_net(sk);
 	struct tcp_metrics_block *tm;
 	u32 val, crtt = 0; /* cached RTT scaled by 8 */
 
@@ -458,7 +462,8 @@
 	if (tcp_metric_locked(tm, TCP_METRIC_CWND))
 		tp->snd_cwnd_clamp = tcp_metric_get(tm, TCP_METRIC_CWND);
 
-	val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
+	val = net->ipv4.sysctl_tcp_no_ssthresh_metrics_save ?
+	      0 : tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
 	if (val) {
 		tp->snd_ssthresh = val;
 		if (tp->snd_ssthresh > tp->snd_cwnd_clamp)
@@ -938,7 +943,7 @@
 	return 0;
 }
 
-static const struct genl_ops tcp_metrics_nl_ops[] = {
+static const struct genl_small_ops tcp_metrics_nl_ops[] = {
 	{
 		.cmd = TCP_METRICS_CMD_GET,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
@@ -961,8 +966,8 @@
 	.policy = tcp_metrics_nl_policy,
 	.netnsok	= true,
 	.module		= THIS_MODULE,
-	.ops		= tcp_metrics_nl_ops,
-	.n_ops		= ARRAY_SIZE(tcp_metrics_nl_ops),
+	.small_ops	= tcp_metrics_nl_ops,
+	.n_small_ops	= ARRAY_SIZE(tcp_metrics_nl_ops),
 };
 
 static unsigned int tcpmhash_entries;
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 194743b..f0f67b2 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -414,7 +414,7 @@
 
 		rcu_read_lock();
 		ca = tcp_ca_find_key(ca_key);
-		if (likely(ca && try_module_get(ca->owner))) {
+		if (likely(ca && bpf_try_module_get(ca, ca->owner))) {
 			icsk->icsk_ca_dst_locked = tcp_ca_dst_locked(dst);
 			icsk->icsk_ca_ops = ca;
 			ca_got_dst = true;
@@ -425,7 +425,7 @@
 	/* If no valid choice made yet, assign current system default ca. */
 	if (!ca_got_dst &&
 	    (!icsk->icsk_ca_setsockopt ||
-	     !try_module_get(icsk->icsk_ca_ops->owner)))
+	     !bpf_try_module_get(icsk->icsk_ca_ops, icsk->icsk_ca_ops->owner)))
 		tcp_assign_congestion_control(sk);
 
 	tcp_set_ca_state(sk, TCP_CA_Open);
@@ -548,6 +548,8 @@
 	newtp->fastopen_req = NULL;
 	RCU_INIT_POINTER(newtp->fastopen_rsk, NULL);
 
+	tcp_bpf_clone(sk, newsk);
+
 	__TCP_INC_STATS(sock_net(sk), TCP_MIB_PASSIVEOPENS);
 
 	return newsk;
@@ -772,6 +774,12 @@
 	if (!child)
 		goto listen_overflow;
 
+	if (own_req && rsk_drop_req(req)) {
+		reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req);
+		inet_csk_reqsk_queue_drop_and_put(sk, req);
+		return child;
+	}
+
 	sock_rps_save_rxhash(child, skb);
 	tcp_synack_rtt_meas(child, req);
 	*req_stolen = !own_req;
@@ -820,6 +828,7 @@
 
 int tcp_child_process(struct sock *parent, struct sock *child,
 		      struct sk_buff *skb)
+	__releases(&((child)->sk_lock.slock))
 {
 	int ret = 0;
 	int state = child->sk_state;
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 638d7b4..19ef457 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -38,6 +38,7 @@
 #define pr_fmt(fmt) "TCP: " fmt
 
 #include <net/tcp.h>
+#include <net/mptcp.h>
 
 #include <linux/compiler.h>
 #include <linux/gfp.h>
@@ -183,10 +184,10 @@
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
-	if (unlikely(tp->compressed_ack > TCP_FASTRETRANS_THRESH)) {
+	if (unlikely(tp->compressed_ack)) {
 		NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPACKCOMPRESSED,
-			      tp->compressed_ack - TCP_FASTRETRANS_THRESH);
-		tp->compressed_ack = TCP_FASTRETRANS_THRESH;
+			      tp->compressed_ack);
+		tp->compressed_ack = 0;
 		if (hrtimer_try_to_cancel(&tp->compressed_ack_timer) == 1)
 			__sock_put(sk);
 	}
@@ -414,6 +415,7 @@
 #define OPTION_WSCALE		(1 << 3)
 #define OPTION_FAST_OPEN_COOKIE	(1 << 8)
 #define OPTION_SMC		(1 << 9)
+#define OPTION_MPTCP		(1 << 10)
 
 static void smc_options_write(__be32 *ptr, u16 *options)
 {
@@ -436,11 +438,160 @@
 	u8 ws;			/* window scale, 0 to disable */
 	u8 num_sack_blocks;	/* number of SACK blocks to include */
 	u8 hash_size;		/* bytes in hash_location */
+	u8 bpf_opt_len;		/* length of BPF hdr option */
 	__u8 *hash_location;	/* temporary pointer, overloaded */
 	__u32 tsval, tsecr;	/* need to include OPTION_TS */
 	struct tcp_fastopen_cookie *fastopen_cookie;	/* Fast open cookie */
+	struct mptcp_out_options mptcp;
 };
 
+static void mptcp_options_write(__be32 *ptr, struct tcp_out_options *opts)
+{
+#if IS_ENABLED(CONFIG_MPTCP)
+	if (unlikely(OPTION_MPTCP & opts->options))
+		mptcp_write_options(ptr, &opts->mptcp);
+#endif
+}
+
+#ifdef CONFIG_CGROUP_BPF
+static int bpf_skops_write_hdr_opt_arg0(struct sk_buff *skb,
+					enum tcp_synack_type synack_type)
+{
+	if (unlikely(!skb))
+		return BPF_WRITE_HDR_TCP_CURRENT_MSS;
+
+	if (unlikely(synack_type == TCP_SYNACK_COOKIE))
+		return BPF_WRITE_HDR_TCP_SYNACK_COOKIE;
+
+	return 0;
+}
+
+/* req, syn_skb and synack_type are used when writing synack */
+static void bpf_skops_hdr_opt_len(struct sock *sk, struct sk_buff *skb,
+				  struct request_sock *req,
+				  struct sk_buff *syn_skb,
+				  enum tcp_synack_type synack_type,
+				  struct tcp_out_options *opts,
+				  unsigned int *remaining)
+{
+	struct bpf_sock_ops_kern sock_ops;
+	int err;
+
+	if (likely(!BPF_SOCK_OPS_TEST_FLAG(tcp_sk(sk),
+					   BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG)) ||
+	    !*remaining)
+		return;
+
+	/* *remaining has already been aligned to 4 bytes, so *remaining >= 4 */
+
+	/* init sock_ops */
+	memset(&sock_ops, 0, offsetof(struct bpf_sock_ops_kern, temp));
+
+	sock_ops.op = BPF_SOCK_OPS_HDR_OPT_LEN_CB;
+
+	if (req) {
+		/* The listen "sk" cannot be passed here because
+		 * it is not locked.  It would not make too much
+		 * sense to do bpf_setsockopt(listen_sk) based
+		 * on individual connection request also.
+		 *
+		 * Thus, "req" is passed here and the cgroup-bpf-progs
+		 * of the listen "sk" will be run.
+		 *
+		 * "req" is also used here for fastopen even the "sk" here is
+		 * a fullsock "child" sk.  It is to keep the behavior
+		 * consistent between fastopen and non-fastopen on
+		 * the bpf programming side.
+		 */
+		sock_ops.sk = (struct sock *)req;
+		sock_ops.syn_skb = syn_skb;
+	} else {
+		sock_owned_by_me(sk);
+
+		sock_ops.is_fullsock = 1;
+		sock_ops.sk = sk;
+	}
+
+	sock_ops.args[0] = bpf_skops_write_hdr_opt_arg0(skb, synack_type);
+	sock_ops.remaining_opt_len = *remaining;
+	/* tcp_current_mss() does not pass a skb */
+	if (skb)
+		bpf_skops_init_skb(&sock_ops, skb, 0);
+
+	err = BPF_CGROUP_RUN_PROG_SOCK_OPS_SK(&sock_ops, sk);
+
+	if (err || sock_ops.remaining_opt_len == *remaining)
+		return;
+
+	opts->bpf_opt_len = *remaining - sock_ops.remaining_opt_len;
+	/* round up to 4 bytes */
+	opts->bpf_opt_len = (opts->bpf_opt_len + 3) & ~3;
+
+	*remaining -= opts->bpf_opt_len;
+}
+
+static void bpf_skops_write_hdr_opt(struct sock *sk, struct sk_buff *skb,
+				    struct request_sock *req,
+				    struct sk_buff *syn_skb,
+				    enum tcp_synack_type synack_type,
+				    struct tcp_out_options *opts)
+{
+	u8 first_opt_off, nr_written, max_opt_len = opts->bpf_opt_len;
+	struct bpf_sock_ops_kern sock_ops;
+	int err;
+
+	if (likely(!max_opt_len))
+		return;
+
+	memset(&sock_ops, 0, offsetof(struct bpf_sock_ops_kern, temp));
+
+	sock_ops.op = BPF_SOCK_OPS_WRITE_HDR_OPT_CB;
+
+	if (req) {
+		sock_ops.sk = (struct sock *)req;
+		sock_ops.syn_skb = syn_skb;
+	} else {
+		sock_owned_by_me(sk);
+
+		sock_ops.is_fullsock = 1;
+		sock_ops.sk = sk;
+	}
+
+	sock_ops.args[0] = bpf_skops_write_hdr_opt_arg0(skb, synack_type);
+	sock_ops.remaining_opt_len = max_opt_len;
+	first_opt_off = tcp_hdrlen(skb) - max_opt_len;
+	bpf_skops_init_skb(&sock_ops, skb, first_opt_off);
+
+	err = BPF_CGROUP_RUN_PROG_SOCK_OPS_SK(&sock_ops, sk);
+
+	if (err)
+		nr_written = 0;
+	else
+		nr_written = max_opt_len - sock_ops.remaining_opt_len;
+
+	if (nr_written < max_opt_len)
+		memset(skb->data + first_opt_off + nr_written, TCPOPT_NOP,
+		       max_opt_len - nr_written);
+}
+#else
+static void bpf_skops_hdr_opt_len(struct sock *sk, struct sk_buff *skb,
+				  struct request_sock *req,
+				  struct sk_buff *syn_skb,
+				  enum tcp_synack_type synack_type,
+				  struct tcp_out_options *opts,
+				  unsigned int *remaining)
+{
+}
+
+static void bpf_skops_write_hdr_opt(struct sock *sk, struct sk_buff *skb,
+				    struct request_sock *req,
+				    struct sk_buff *syn_skb,
+				    enum tcp_synack_type synack_type,
+				    struct tcp_out_options *opts)
+{
+}
+#endif
+
 /* Write previously computed TCP options to the packet.
  *
  * Beware: Something in the Internet is very sensitive to the ordering of
@@ -549,6 +700,8 @@
 	}
 
 	smc_options_write(ptr, &options);
+
+	mptcp_options_write(ptr, opts);
 }
 
 static void smc_set_option(const struct tcp_sock *tp,
@@ -584,6 +737,22 @@
 #endif
 }
 
+static void mptcp_set_option_cond(const struct request_sock *req,
+				  struct tcp_out_options *opts,
+				  unsigned int *remaining)
+{
+	if (rsk_is_mptcp(req)) {
+		unsigned int size;
+
+		if (mptcp_synack_options(req, &size, &opts->mptcp)) {
+			if (*remaining >= size) {
+				opts->options |= OPTION_MPTCP;
+				*remaining -= size;
+			}
+		}
+	}
+}
+
 /* Compute TCP options for SYN packets. This is not the final
  * network wire format yet.
  */
@@ -653,6 +822,17 @@
 
 	smc_set_option(tp, opts, &remaining);
 
+	if (sk_is_mptcp(sk)) {
+		unsigned int size;
+
+		if (mptcp_syn_options(sk, skb, &size, &opts->mptcp)) {
+			opts->options |= OPTION_MPTCP;
+			remaining -= size;
+		}
+	}
+
+	bpf_skops_hdr_opt_len(sk, skb, NULL, NULL, 0, opts, &remaining);
+
 	return MAX_TCP_OPTION_SPACE - remaining;
 }
 
@@ -663,7 +843,8 @@
 				       struct tcp_out_options *opts,
 				       const struct tcp_md5sig_key *md5,
 				       struct tcp_fastopen_cookie *foc,
-				       enum tcp_synack_type synack_type)
+				       enum tcp_synack_type synack_type,
+				       struct sk_buff *syn_skb)
 {
 	struct inet_request_sock *ireq = inet_rsk(req);
 	unsigned int remaining = MAX_TCP_OPTION_SPACE;
@@ -716,8 +897,13 @@
 		}
 	}
 
+	mptcp_set_option_cond(req, opts, &remaining);
+
 	smc_set_option_cond(tcp_sk(sk), ireq, opts, &remaining);
 
+	bpf_skops_hdr_opt_len((struct sock *)sk, skb, req, syn_skb,
+			      synack_type, opts, &remaining);
+
 	return MAX_TCP_OPTION_SPACE - remaining;
 }
 
@@ -753,16 +939,46 @@
 		size += TCPOLEN_TSTAMP_ALIGNED;
 	}
 
+	/* MPTCP options have precedence over SACK for the limited TCP
+	 * option space because a MPTCP connection would be forced to
+	 * fall back to regular TCP if a required multipath option is
+	 * missing. SACK still gets a chance to use whatever space is
+	 * left.
+	 */
+	if (sk_is_mptcp(sk)) {
+		unsigned int remaining = MAX_TCP_OPTION_SPACE - size;
+		unsigned int opt_size = 0;
+
+		if (mptcp_established_options(sk, skb, &opt_size, remaining,
+					      &opts->mptcp)) {
+			opts->options |= OPTION_MPTCP;
+			size += opt_size;
+		}
+	}
+
 	eff_sacks = tp->rx_opt.num_sacks + tp->rx_opt.dsack;
 	if (unlikely(eff_sacks)) {
 		const unsigned int remaining = MAX_TCP_OPTION_SPACE - size;
+		if (unlikely(remaining < TCPOLEN_SACK_BASE_ALIGNED +
+					 TCPOLEN_SACK_PERBLOCK))
+			return size;
+
 		opts->num_sack_blocks =
 			min_t(unsigned int, eff_sacks,
 			      (remaining - TCPOLEN_SACK_BASE_ALIGNED) /
 			      TCPOLEN_SACK_PERBLOCK);
-		if (likely(opts->num_sack_blocks))
-			size += TCPOLEN_SACK_BASE_ALIGNED +
-				opts->num_sack_blocks * TCPOLEN_SACK_PERBLOCK;
+
+		size += TCPOLEN_SACK_BASE_ALIGNED +
+			opts->num_sack_blocks * TCPOLEN_SACK_PERBLOCK;
+	}
+
+	if (unlikely(BPF_SOCK_OPS_TEST_FLAG(tp,
+					    BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG))) {
+		unsigned int remaining = MAX_TCP_OPTION_SPACE - size;
+
+		bpf_skops_hdr_opt_len(sk, skb, NULL, NULL, 0, opts, &remaining);
+
+		size = MAX_TCP_OPTION_SPACE - remaining;
 	}
 
 	return size;
@@ -1005,6 +1221,10 @@
 	list_move_tail(&skb->tcp_tsorted_anchor, &tp->tsorted_sent_queue);
 }
 
+INDIRECT_CALLABLE_DECLARE(int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl));
+INDIRECT_CALLABLE_DECLARE(int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl));
+INDIRECT_CALLABLE_DECLARE(void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb));
+
 /* This routine actually transmits TCP packets queued in by
  * tcp_do_sendmsg().  This is used by both the initial
  * transmission and possible later retransmissions.
@@ -1148,7 +1368,12 @@
 	}
 #endif
 
-	icsk->icsk_af_ops->send_check(sk, skb);
+	/* BPF prog is the last one writing header option */
+	bpf_skops_write_hdr_opt(sk, skb, NULL, NULL, 0, &opts);
+
+	INDIRECT_CALL_INET(icsk->icsk_af_ops->send_check,
+			   tcp_v6_send_check, tcp_v4_send_check,
+			   sk, skb);
 
 	if (likely(tcb->tcp_flags & TCPHDR_ACK))
 		tcp_event_ack_sent(sk, tcp_skb_pcount(skb), rcv_nxt);
@@ -1176,7 +1401,9 @@
 
 	tcp_add_tx_delay(skb, tp);
 
-	err = icsk->icsk_af_ops->queue_xmit(sk, skb, &inet->cork.fl);
+	err = INDIRECT_CALL_INET(icsk->icsk_af_ops->queue_xmit,
+				 inet6_csk_xmit, ip_queue_xmit,
+				 sk, skb, &inet->cork.fl);
 
 	if (unlikely(err > 0)) {
 		tcp_enter_cwr(sk);
@@ -1455,7 +1682,6 @@
 		skb->truesize	   -= delta_truesize;
 		sk_wmem_queued_add(sk, -delta_truesize);
 		sk_mem_uncharge(sk, delta_truesize);
-		sock_set_flag(sk, SOCK_QUEUE_SHRUNK);
 	}
 
 	/* Any change of skb->len requires recalculation of tso factor. */
@@ -2538,8 +2764,7 @@
 	if (rto_delta_us > 0)
 		timeout = min_t(u32, timeout, usecs_to_jiffies(rto_delta_us));
 
-	tcp_reset_xmit_timer(sk, ICSK_TIME_LOSS_PROBE, timeout,
-			     TCP_RTO_MAX, NULL);
+	tcp_reset_xmit_timer(sk, ICSK_TIME_LOSS_PROBE, timeout, TCP_RTO_MAX);
 	return true;
 }
 
@@ -2720,8 +2945,12 @@
 	int mss = icsk->icsk_ack.rcv_mss;
 	int free_space = tcp_space(sk);
 	int allowed_space = tcp_full_space(sk);
-	int full_space = min_t(int, tp->window_clamp, allowed_space);
-	int window;
+	int full_space, window;
+
+	if (sk_is_mptcp(sk))
+		mptcp_space(sk, &free_space, &allowed_space);
+
+	full_space = min_t(int, tp->window_clamp, allowed_space);
 
 	if (unlikely(mss > full_space)) {
 		mss = full_space;
@@ -2878,7 +3107,7 @@
 		if (!tcp_can_collapse(sk, skb))
 			break;
 
-		if (!tcp_skb_can_collapse_to(to))
+		if (!tcp_skb_can_collapse(to, skb))
 			break;
 
 		space -= skb->len;
@@ -3057,6 +3286,7 @@
 	const struct inet_connection_sock *icsk = inet_csk(sk);
 	struct sk_buff *skb, *rtx_head, *hole = NULL;
 	struct tcp_sock *tp = tcp_sk(sk);
+	bool rearm_timer = false;
 	u32 max_segs;
 	int mib_idx;
 
@@ -3079,7 +3309,7 @@
 
 		segs = tp->snd_cwnd - tcp_packets_in_flight(tp);
 		if (segs <= 0)
-			return;
+			break;
 		sacked = TCP_SKB_CB(skb)->sacked;
 		/* In case tcp_shift_skb_data() have aggregated large skbs,
 		 * we need to make sure not sending too bigs TSO packets
@@ -3104,10 +3334,10 @@
 			continue;
 
 		if (tcp_small_queue_check(sk, skb, 1))
-			return;
+			break;
 
 		if (tcp_retransmit_skb(sk, skb, segs))
-			return;
+			break;
 
 		NET_ADD_STATS(sock_net(sk), mib_idx, tcp_skb_pcount(skb));
 
@@ -3116,11 +3346,13 @@
 
 		if (skb == rtx_head &&
 		    icsk->icsk_pending != ICSK_TIME_REO_TIMEOUT)
-			tcp_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
-					     inet_csk(sk)->icsk_rto,
-					     TCP_RTO_MAX,
-					     skb);
+			rearm_timer = true;
+
 	}
+	if (rearm_timer)
+		tcp_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+				     inet_csk(sk)->icsk_rto,
+				     TCP_RTO_MAX);
 }
 
 /* We allow to exceed memory limits for FIN packets to expedite
@@ -3149,7 +3381,7 @@
  */
 void tcp_send_fin(struct sock *sk)
 {
-	struct sk_buff *skb, *tskb = tcp_write_queue_tail(sk);
+	struct sk_buff *skb, *tskb, *tail = tcp_write_queue_tail(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	/* Optimization, tack on the FIN if we have one skb in write queue and
@@ -3157,6 +3389,7 @@
 	 * Note: in the latter case, FIN packet will be sent after a timeout,
 	 * as TCP stack thinks it has already been transmitted.
 	 */
+	tskb = tail;
 	if (!tskb && tcp_under_memory_pressure(sk))
 		tskb = skb_rb_last(&sk->tcp_rtx_queue);
 
@@ -3164,7 +3397,7 @@
 		TCP_SKB_CB(tskb)->tcp_flags |= TCPHDR_FIN;
 		TCP_SKB_CB(tskb)->end_seq++;
 		tp->write_seq++;
-		if (tcp_write_queue_empty(sk)) {
+		if (!tail) {
 			/* This means tskb was already sent.
 			 * Pretend we included the FIN on previous transmit.
 			 * We need to set tp->snd_nxt to the value it would have
@@ -3264,18 +3497,20 @@
 }
 
 /**
- * tcp_make_synack - Prepare a SYN-ACK.
- * sk: listener socket
- * dst: dst entry attached to the SYNACK
- * req: request_sock pointer
- *
- * Allocate one skb and build a SYNACK packet.
- * @dst is consumed : Caller should not use it again.
+ * tcp_make_synack - Allocate one skb and build a SYNACK packet.
+ * @sk: listener socket
+ * @dst: dst entry attached to the SYNACK. It is consumed and caller
+ *       should not use it again.
+ * @req: request_sock pointer
+ * @foc: cookie for tcp fast open
+ * @synack_type: Type of synack to prepare
+ * @syn_skb: SYN packet just received.  It could be NULL for rtx case.
  */
 struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
 				struct request_sock *req,
 				struct tcp_fastopen_cookie *foc,
-				enum tcp_synack_type synack_type)
+				enum tcp_synack_type synack_type,
+				struct sk_buff *syn_skb)
 {
 	struct inet_request_sock *ireq = inet_rsk(req);
 	const struct tcp_sock *tp = tcp_sk(sk);
@@ -3319,8 +3554,8 @@
 	memset(&opts, 0, sizeof(opts));
 	now = tcp_clock_ns();
 #ifdef CONFIG_SYN_COOKIES
-	if (unlikely(req->cookie_ts))
-		skb->skb_mstamp_ns = cookie_init_timestamp(req);
+	if (unlikely(synack_type == TCP_SYNACK_COOKIE && ireq->tstamp_ok))
+		skb->skb_mstamp_ns = cookie_init_timestamp(req, now);
 	else
 #endif
 	{
@@ -3334,8 +3569,11 @@
 	md5 = tcp_rsk(req)->af_specific->req_md5_lookup(sk, req_to_sk(req));
 #endif
 	skb_set_hash(skb, tcp_rsk(req)->txhash, PKT_HASH_TYPE_L4);
+	/* bpf program will be interested in the tcp_flags */
+	TCP_SKB_CB(skb)->tcp_flags = TCPHDR_SYN | TCPHDR_ACK;
 	tcp_header_size = tcp_synack_options(sk, req, mss, skb, &opts, md5,
-					     foc, synack_type) + sizeof(*th);
+					     foc, synack_type,
+					     syn_skb) + sizeof(*th);
 
 	skb_push(skb, tcp_header_size);
 	skb_reset_transport_header(skb);
@@ -3367,6 +3605,9 @@
 	rcu_read_unlock();
 #endif
 
+	bpf_skops_write_hdr_opt((struct sock *)sk, skb, req, syn_skb,
+				synack_type, &opts);
+
 	skb->skb_mstamp_ns = now;
 	tcp_add_tx_delay(skb, tp);
 
@@ -3385,8 +3626,8 @@
 
 	rcu_read_lock();
 	ca = tcp_ca_find_key(ca_key);
-	if (likely(ca && try_module_get(ca->owner))) {
-		module_put(icsk->icsk_ca_ops->owner);
+	if (likely(ca && bpf_try_module_get(ca, ca->owner))) {
+		bpf_module_put(icsk->icsk_ca_ops, icsk->icsk_ca_ops->owner);
 		icsk->icsk_ca_dst_locked = tcp_ca_dst_locked(dst);
 		icsk->icsk_ca_ops = ca;
 	}
@@ -3667,16 +3908,15 @@
 		ato = min(ato, max_ato);
 	}
 
+	ato = min_t(u32, ato, inet_csk(sk)->icsk_delack_max);
+
 	/* Stay within the limit we were given */
 	timeout = jiffies + ato;
 
 	/* Use new timeout only if there wasn't a older one earlier. */
 	if (icsk->icsk_ack.pending & ICSK_ACK_TIMER) {
-		/* If delack timer was blocked or is about to expire,
-		 * send ACK now.
-		 */
-		if (icsk->icsk_ack.blocked ||
-		    time_before_eq(icsk->icsk_ack.timeout, jiffies + (ato >> 2))) {
+		/* If delack timer is about to expire, send ACK now. */
+		if (time_before_eq(icsk->icsk_ack.timeout, jiffies + (ato >> 2))) {
 			tcp_send_ack(sk);
 			return;
 		}
@@ -3705,10 +3945,15 @@
 	buff = alloc_skb(MAX_TCP_HEADER,
 			 sk_gfp_mask(sk, GFP_ATOMIC | __GFP_NOWARN));
 	if (unlikely(!buff)) {
+		struct inet_connection_sock *icsk = inet_csk(sk);
+		unsigned long delay;
+
+		delay = TCP_DELACK_MAX << icsk->icsk_ack.retry;
+		if (delay < TCP_RTO_MAX)
+			icsk->icsk_ack.retry++;
 		inet_csk_schedule_ack(sk);
-		inet_csk(sk)->icsk_ack.ato = TCP_ATO_MIN;
-		inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
-					  TCP_DELACK_MAX, TCP_RTO_MAX);
+		icsk->icsk_ack.ato = TCP_ATO_MIN;
+		inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, delay, TCP_RTO_MAX);
 		return;
 	}
 
@@ -3853,7 +4098,7 @@
 	}
 
 	timeout = tcp_clamp_probe0_to_user_timeout(sk, timeout);
-	tcp_reset_xmit_timer(sk, ICSK_TIME_PROBE0, timeout, TCP_RTO_MAX, NULL);
+	tcp_reset_xmit_timer(sk, ICSK_TIME_PROBE0, timeout, TCP_RTO_MAX);
 }
 
 int tcp_rtx_synack(const struct sock *sk, struct request_sock *req)
@@ -3863,7 +4108,8 @@
 	int res;
 
 	tcp_rsk(req)->txhash = net_tx_rndhash();
-	res = af_ops->send_synack(sk, NULL, &fl, req, NULL, TCP_SYNACK_NORMAL);
+	res = af_ops->send_synack(sk, NULL, &fl, req, NULL, TCP_SYNACK_NORMAL,
+				  NULL);
 	if (!res) {
 		__TCP_INC_STATS(sock_net(sk), TCP_MIB_RETRANSSEGS);
 		__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNRETRANS);
diff --git a/net/ipv4/tcp_recovery.c b/net/ipv4/tcp_recovery.c
index 8757bb6..31fc178 100644
--- a/net/ipv4/tcp_recovery.c
+++ b/net/ipv4/tcp_recovery.c
@@ -2,20 +2,6 @@
 #include <linux/tcp.h>
 #include <net/tcp.h>
 
-void tcp_mark_skb_lost(struct sock *sk, struct sk_buff *skb)
-{
-	struct tcp_sock *tp = tcp_sk(sk);
-
-	tcp_skb_mark_lost_uncond_verify(tp, skb);
-	if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) {
-		/* Account for retransmits that are lost again */
-		TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS;
-		tp->retrans_out -= tcp_skb_pcount(skb);
-		NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPLOSTRETRANSMIT,
-			      tcp_skb_pcount(skb));
-	}
-}
-
 static bool tcp_rack_sent_after(u64 t1, u64 t2, u32 seq1, u32 seq2)
 {
 	return t1 > t2 || (t1 == t2 && after(seq1, seq2));
@@ -247,6 +233,6 @@
 			tcp_fragment(sk, TCP_FRAG_IN_RTX_QUEUE, skb,
 				     mss, mss, GFP_ATOMIC);
 
-		tcp_skb_mark_lost_uncond_verify(tp, skb);
+		tcp_mark_skb_lost(sk, skb);
 	}
 }
diff --git a/net/ipv4/tcp_scalable.c b/net/ipv4/tcp_scalable.c
index 471571e..5842081 100644
--- a/net/ipv4/tcp_scalable.c
+++ b/net/ipv4/tcp_scalable.c
@@ -10,10 +10,9 @@
 #include <net/tcp.h>
 
 /* These factors derived from the recommended values in the aer:
- * .01 and and 7/8. We use 50 instead of 100 to account for
- * delayed ack.
+ * .01 and 7/8.
  */
-#define TCP_SCALABLE_AI_CNT	50U
+#define TCP_SCALABLE_AI_CNT	100U
 #define TCP_SCALABLE_MD_SCALE	3
 
 static void tcp_scalable_cong_avoid(struct sock *sk, u32 ack, u32 acked)
@@ -23,11 +22,13 @@
 	if (!tcp_is_cwnd_limited(sk))
 		return;
 
-	if (tcp_in_slow_start(tp))
-		tcp_slow_start(tp, acked);
-	else
-		tcp_cong_avoid_ai(tp, min(tp->snd_cwnd, TCP_SCALABLE_AI_CNT),
-				  1);
+	if (tcp_in_slow_start(tp)) {
+		acked = tcp_slow_start(tp, acked);
+		if (!acked)
+			return;
+	}
+	tcp_cong_avoid_ai(tp, min(tp->snd_cwnd, TCP_SCALABLE_AI_CNT),
+			  acked);
 }
 
 static u32 tcp_scalable_ssthresh(struct sock *sk)
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index fa2ae96..4ef0807 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -237,11 +237,8 @@
 	int retry_until;
 
 	if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
-		if (icsk->icsk_retransmits) {
-			dst_negative_advice(sk);
-		} else {
-			sk_rethink_txhash(sk);
-		}
+		if (icsk->icsk_retransmits)
+			__dst_negative_advice(sk);
 		retry_until = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_syn_retries;
 		expired = icsk->icsk_retransmits >= retry_until;
 	} else {
@@ -249,9 +246,7 @@
 			/* Black hole detection */
 			tcp_mtu_probing(icsk, sk);
 
-			dst_negative_advice(sk);
-		} else {
-			sk_rethink_txhash(sk);
+			__dst_negative_advice(sk);
 		}
 
 		retry_until = net->ipv4.sysctl_tcp_retries2;
@@ -282,6 +277,11 @@
 		return 1;
 	}
 
+	if (sk_rethink_txhash(sk)) {
+		tp->timeout_rehash++;
+		__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPTIMEOUTREHASH);
+	}
+
 	return 0;
 }
 
@@ -326,7 +326,7 @@
 
 /**
  *  tcp_delack_timer() - The TCP delayed ACK timeout handler
- *  @data:  Pointer to the current socket. (gets casted to struct sock *)
+ *  @t:  Pointer to the timer. (gets casted to struct sock *)
  *
  *  This function gets (indirectly) called when the kernel timer for a TCP packet
  *  of this socket expires. Calls tcp_delack_timer_handler() to do the actual work.
@@ -343,7 +343,6 @@
 	if (!sock_owned_by_user(sk)) {
 		tcp_delack_timer_handler(sk);
 	} else {
-		icsk->icsk_ack.blocked = 1;
 		__NET_INC_STATS(sock_net(sk), LINUX_MIB_DELAYEDACKLOCKED);
 		/* deleguate our work to tcp_release_cb() */
 		if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED, &sk->sk_tsq_flags))
@@ -452,6 +451,7 @@
 	struct net *net = sock_net(sk);
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct request_sock *req;
+	struct sk_buff *skb;
 
 	req = rcu_dereference_protected(tp->fastopen_rsk,
 					lockdep_sock_is_held(sk));
@@ -464,7 +464,12 @@
 		 */
 		return;
 	}
-	if (!tp->packets_out || WARN_ON_ONCE(tcp_rtx_queue_empty(sk)))
+
+	if (!tp->packets_out)
+		return;
+
+	skb = tcp_rtx_queue_head(sk);
+	if (WARN_ON_ONCE(!skb))
 		return;
 
 	tp->tlp_high_seq = 0;
@@ -498,7 +503,7 @@
 			goto out;
 		}
 		tcp_enter_loss(sk);
-		tcp_retransmit_skb(sk, tcp_rtx_queue_head(sk), 1);
+		tcp_retransmit_skb(sk, skb, 1);
 		__sk_dst_reset(sk);
 		goto out_reset_timer;
 	}
@@ -759,8 +764,14 @@
 
 	bh_lock_sock(sk);
 	if (!sock_owned_by_user(sk)) {
-		if (tp->compressed_ack > TCP_FASTRETRANS_THRESH)
+		if (tp->compressed_ack) {
+			/* Since we have to send one ack finally,
+			 * substract one from tp->compressed_ack to keep
+			 * LINUX_MIB_TCPACKCOMPRESSED accurate.
+			 */
+			tp->compressed_ack--;
 			tcp_send_ack(sk);
+		}
 	} else {
 		if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED,
 				      &sk->sk_tsq_flags))
diff --git a/net/ipv4/tcp_ulp.c b/net/ipv4/tcp_ulp.c
index 9168645..7c27aa6 100644
--- a/net/ipv4/tcp_ulp.c
+++ b/net/ipv4/tcp_ulp.c
@@ -22,7 +22,8 @@
 {
 	struct tcp_ulp_ops *e;
 
-	list_for_each_entry_rcu(e, &tcp_ulp_list, list) {
+	list_for_each_entry_rcu(e, &tcp_ulp_list, list,
+				lockdep_is_held(&tcp_ulp_list_lock)) {
 		if (strcmp(e->name, name) == 0)
 			return e;
 	}
@@ -92,6 +93,9 @@
 		offs += snprintf(buf + offs, maxlen - offs,
 				 "%s%s",
 				 offs == 0 ? "" : " ", ulp_ops->name);
+
+		if (WARN_ON_ONCE(offs >= maxlen))
+			break;
 	}
 	rcu_read_unlock();
 }
@@ -101,12 +105,6 @@
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 
-	if (!icsk->icsk_ulp_ops) {
-		sk->sk_write_space = write_space;
-		sk->sk_prot = proto;
-		return;
-	}
-
 	if (icsk->icsk_ulp_ops->update)
 		icsk->icsk_ulp_ops->update(sk, proto, write_space);
 }
diff --git a/net/ipv4/tcp_vegas.c b/net/ipv4/tcp_vegas.c
index 3f51e78..c8003c8 100644
--- a/net/ipv4/tcp_vegas.c
+++ b/net/ipv4/tcp_vegas.c
@@ -293,10 +293,10 @@
 	const struct vegas *ca = inet_csk_ca(sk);
 
 	if (ext & (1 << (INET_DIAG_VEGASINFO - 1))) {
-		info->vegas.tcpv_enabled = ca->doing_vegas_now,
-		info->vegas.tcpv_rttcnt = ca->cntRTT,
-		info->vegas.tcpv_rtt = ca->baseRTT,
-		info->vegas.tcpv_minrtt = ca->minRTT,
+		info->vegas.tcpv_enabled = ca->doing_vegas_now;
+		info->vegas.tcpv_rttcnt = ca->cntRTT;
+		info->vegas.tcpv_rtt = ca->baseRTT;
+		info->vegas.tcpv_minrtt = ca->minRTT;
 
 		*attr = INET_DIAG_VEGASINFO;
 		return sizeof(struct tcpvegas_info);
diff --git a/net/ipv4/tcp_veno.c b/net/ipv4/tcp_veno.c
index 3b36bb1..cd50a61 100644
--- a/net/ipv4/tcp_veno.c
+++ b/net/ipv4/tcp_veno.c
@@ -7,7 +7,7 @@
  *    "TCP Veno: TCP Enhancement for Transmission over Wireless Access Networks."
  *    IEEE Journal on Selected Areas in Communication,
  *    Feb. 2003.
- * 	See http://www.ie.cuhk.edu.hk/fileadmin/staff_upload/soung/Journal/J3.pdf
+ * 	See https://www.ie.cuhk.edu.hk/fileadmin/staff_upload/soung/Journal/J3.pdf
  */
 
 #include <linux/mm.h>
@@ -153,31 +153,34 @@
 		veno->diff = (tp->snd_cwnd << V_PARAM_SHIFT) - target_cwnd;
 
 		if (tcp_in_slow_start(tp)) {
-			/* Slow start.  */
-			tcp_slow_start(tp, acked);
-		} else {
-			/* Congestion avoidance. */
-			if (veno->diff < beta) {
-				/* In the "non-congestive state", increase cwnd
-				 *  every rtt.
-				 */
-				tcp_cong_avoid_ai(tp, tp->snd_cwnd, 1);
-			} else {
-				/* In the "congestive state", increase cwnd
-				 * every other rtt.
-				 */
-				if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
-					if (veno->inc &&
-					    tp->snd_cwnd < tp->snd_cwnd_clamp) {
-						tp->snd_cwnd++;
-						veno->inc = 0;
-					} else
-						veno->inc = 1;
-					tp->snd_cwnd_cnt = 0;
-				} else
-					tp->snd_cwnd_cnt++;
-			}
+			/* Slow start. */
+			acked = tcp_slow_start(tp, acked);
+			if (!acked)
+				goto done;
 		}
+
+		/* Congestion avoidance. */
+		if (veno->diff < beta) {
+			/* In the "non-congestive state", increase cwnd
+			 * every rtt.
+			 */
+			tcp_cong_avoid_ai(tp, tp->snd_cwnd, acked);
+		} else {
+			/* In the "congestive state", increase cwnd
+			 * every other rtt.
+			 */
+			if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
+				if (veno->inc &&
+				    tp->snd_cwnd < tp->snd_cwnd_clamp) {
+					tp->snd_cwnd++;
+					veno->inc = 0;
+				} else
+					veno->inc = 1;
+				tp->snd_cwnd_cnt = 0;
+			} else
+				tp->snd_cwnd_cnt += acked;
+		}
+done:
 		if (tp->snd_cwnd < 2)
 			tp->snd_cwnd = 2;
 		else if (tp->snd_cwnd > tp->snd_cwnd_clamp)
diff --git a/net/ipv4/tcp_yeah.c b/net/ipv4/tcp_yeah.c
index e00570d..3bb4487 100644
--- a/net/ipv4/tcp_yeah.c
+++ b/net/ipv4/tcp_yeah.c
@@ -36,8 +36,6 @@
 
 	u32 reno_count;
 	u32 fast_count;
-
-	u32 pkts_acked;
 };
 
 static void tcp_yeah_init(struct sock *sk)
@@ -57,18 +55,6 @@
 	tp->snd_cwnd_clamp = min_t(u32, tp->snd_cwnd_clamp, 0xffffffff/128);
 }
 
-static void tcp_yeah_pkts_acked(struct sock *sk,
-				const struct ack_sample *sample)
-{
-	const struct inet_connection_sock *icsk = inet_csk(sk);
-	struct yeah *yeah = inet_csk_ca(sk);
-
-	if (icsk->icsk_ca_state == TCP_CA_Open)
-		yeah->pkts_acked = sample->pkts_acked;
-
-	tcp_vegas_pkts_acked(sk, sample);
-}
-
 static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack, u32 acked)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -77,24 +63,19 @@
 	if (!tcp_is_cwnd_limited(sk))
 		return;
 
-	if (tcp_in_slow_start(tp))
-		tcp_slow_start(tp, acked);
+	if (tcp_in_slow_start(tp)) {
+		acked = tcp_slow_start(tp, acked);
+		if (!acked)
+			goto do_vegas;
+	}
 
-	else if (!yeah->doing_reno_now) {
+	if (!yeah->doing_reno_now) {
 		/* Scalable */
-
-		tp->snd_cwnd_cnt += yeah->pkts_acked;
-		if (tp->snd_cwnd_cnt > min(tp->snd_cwnd, TCP_SCALABLE_AI_CNT)) {
-			if (tp->snd_cwnd < tp->snd_cwnd_clamp)
-				tp->snd_cwnd++;
-			tp->snd_cwnd_cnt = 0;
-		}
-
-		yeah->pkts_acked = 1;
-
+		tcp_cong_avoid_ai(tp, min(tp->snd_cwnd, TCP_SCALABLE_AI_CNT),
+				  acked);
 	} else {
 		/* Reno */
-		tcp_cong_avoid_ai(tp, tp->snd_cwnd, 1);
+		tcp_cong_avoid_ai(tp, tp->snd_cwnd, acked);
 	}
 
 	/* The key players are v_vegas.beg_snd_una and v_beg_snd_nxt.
@@ -118,7 +99,7 @@
 	 * of bytes we send in an RTT is often less than our cwnd will allow.
 	 * So we keep track of our cwnd separately, in v_beg_snd_cwnd.
 	 */
-
+do_vegas:
 	if (after(ack, yeah->vegas.beg_snd_nxt)) {
 		/* We do the Vegas calculations only if we got enough RTT
 		 * samples that we can be reasonably sure that we got
@@ -232,7 +213,7 @@
 	.set_state	= tcp_vegas_state,
 	.cwnd_event	= tcp_vegas_cwnd_event,
 	.get_info	= tcp_vegas_get_info,
-	.pkts_acked	= tcp_yeah_pkts_acked,
+	.pkts_acked	= tcp_vegas_pkts_acked,
 
 	.owner		= THIS_MODULE,
 	.name		= "yeah",
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c
index c4b2ccb..e44aaf4 100644
--- a/net/ipv4/tunnel4.c
+++ b/net/ipv4/tunnel4.c
@@ -110,6 +110,33 @@
 	return 0;
 }
 
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
+static int tunnel4_rcv_cb(struct sk_buff *skb, u8 proto, int err)
+{
+	struct xfrm_tunnel __rcu *head;
+	struct xfrm_tunnel *handler;
+	int ret;
+
+	head = (proto == IPPROTO_IPIP) ? tunnel4_handlers : tunnel64_handlers;
+
+	for_each_tunnel_rcu(head, handler) {
+		if (handler->cb_handler) {
+			ret = handler->cb_handler(skb, err);
+			if (ret <= 0)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+static const struct xfrm_input_afinfo tunnel4_input_afinfo = {
+	.family		=	AF_INET,
+	.is_ipip	=	true,
+	.callback	=	tunnel4_rcv_cb,
+};
+#endif
+
 #if IS_ENABLED(CONFIG_IPV6)
 static int tunnel64_rcv(struct sk_buff *skb)
 {
@@ -231,6 +258,18 @@
 		goto err;
 	}
 #endif
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
+	if (xfrm_input_register_afinfo(&tunnel4_input_afinfo)) {
+		inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
+#if IS_ENABLED(CONFIG_IPV6)
+		inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6);
+#endif
+#if IS_ENABLED(CONFIG_MPLS)
+		inet_del_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS);
+#endif
+		goto err;
+	}
+#endif
 	return 0;
 
 err:
@@ -240,6 +279,10 @@
 
 static void __exit tunnel4_fini(void)
 {
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
+	if (xfrm_input_unregister_afinfo(&tunnel4_input_afinfo))
+		pr_err("tunnel4 close: can't remove input afinfo\n");
+#endif
 #if IS_ENABLED(CONFIG_MPLS)
 	if (inet_del_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS))
 		pr_err("tunnelmpls4 close: can't remove protocol\n");
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 6f277bd..ef2068a 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -106,12 +106,16 @@
 #include <net/xfrm.h>
 #include <trace/events/udp.h>
 #include <linux/static_key.h>
+#include <linux/btf_ids.h>
 #include <trace/events/skb.h>
 #include <net/busy_poll.h>
 #include "udp_impl.h"
 #include <net/sock_reuseport.h>
 #include <net/addrconf.h>
 #include <net/udp_tunnel.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6_stubs.h>
+#endif
 
 struct udp_table udp_table __read_mostly;
 EXPORT_SYMBOL(udp_table);
@@ -386,7 +390,8 @@
 					dif, sdif);
 	if (!dev_match)
 		return -1;
-	score += 4;
+	if (sk->sk_bound_dev_if)
+		score += 4;
 
 	if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
 		score++;
@@ -405,6 +410,22 @@
 			      udp_ehash_secret + net_hash_mix(net));
 }
 
+static struct sock *lookup_reuseport(struct net *net, struct sock *sk,
+				     struct sk_buff *skb,
+				     __be32 saddr, __be16 sport,
+				     __be32 daddr, unsigned short hnum)
+{
+	struct sock *reuse_sk = NULL;
+	u32 hash;
+
+	if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) {
+		hash = udp_ehashfn(net, daddr, hnum, saddr, sport);
+		reuse_sk = reuseport_select_sock(sk, hash, skb,
+						 sizeof(struct udphdr));
+	}
+	return reuse_sk;
+}
+
 /* called with rcu_read_lock() */
 static struct sock *udp4_lib_lookup2(struct net *net,
 				     __be32 saddr, __be16 sport,
@@ -413,9 +434,8 @@
 				     struct udp_hslot *hslot2,
 				     struct sk_buff *skb)
 {
-	struct sock *sk, *result, *reuseport_result;
+	struct sock *sk, *result;
 	int score, badness;
-	u32 hash = 0;
 
 	result = NULL;
 	badness = 0;
@@ -423,25 +443,42 @@
 		score = compute_score(sk, net, saddr, sport,
 				      daddr, hnum, dif, sdif);
 		if (score > badness) {
-			reuseport_result = NULL;
+			result = lookup_reuseport(net, sk, skb,
+						  saddr, sport, daddr, hnum);
+			/* Fall back to scoring if group has connections */
+			if (result && !reuseport_has_conns(sk, false))
+				return result;
 
-			if (sk->sk_reuseport &&
-			    sk->sk_state != TCP_ESTABLISHED) {
-				hash = udp_ehashfn(net, daddr, hnum,
-						   saddr, sport);
-				reuseport_result = reuseport_select_sock(sk, hash, skb,
-									 sizeof(struct udphdr));
-				if (reuseport_result && !reuseport_has_conns(sk, false))
-					return reuseport_result;
-			}
-
-			result = reuseport_result ? : sk;
+			result = result ? : sk;
 			badness = score;
 		}
 	}
 	return result;
 }
 
+static struct sock *udp4_lookup_run_bpf(struct net *net,
+					struct udp_table *udptable,
+					struct sk_buff *skb,
+					__be32 saddr, __be16 sport,
+					__be32 daddr, u16 hnum)
+{
+	struct sock *sk, *reuse_sk;
+	bool no_reuseport;
+
+	if (udptable != &udp_table)
+		return NULL; /* only UDP is supported */
+
+	no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_UDP,
+					    saddr, sport, daddr, hnum, &sk);
+	if (no_reuseport || IS_ERR_OR_NULL(sk))
+		return sk;
+
+	reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
+	if (reuse_sk)
+		sk = reuse_sk;
+	return sk;
+}
+
 /* UDP is nearly always wildcards out the wazoo, it makes no sense to try
  * harder than this. -DaveM
  */
@@ -449,27 +486,45 @@
 		__be16 sport, __be32 daddr, __be16 dport, int dif,
 		int sdif, struct udp_table *udptable, struct sk_buff *skb)
 {
-	struct sock *result;
 	unsigned short hnum = ntohs(dport);
 	unsigned int hash2, slot2;
 	struct udp_hslot *hslot2;
+	struct sock *result, *sk;
 
 	hash2 = ipv4_portaddr_hash(net, daddr, hnum);
 	slot2 = hash2 & udptable->mask;
 	hslot2 = &udptable->hash2[slot2];
 
+	/* Lookup connected or non-wildcard socket */
 	result = udp4_lib_lookup2(net, saddr, sport,
 				  daddr, hnum, dif, sdif,
 				  hslot2, skb);
-	if (!result) {
-		hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
-		slot2 = hash2 & udptable->mask;
-		hslot2 = &udptable->hash2[slot2];
+	if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED)
+		goto done;
 
-		result = udp4_lib_lookup2(net, saddr, sport,
-					  htonl(INADDR_ANY), hnum, dif, sdif,
-					  hslot2, skb);
+	/* Lookup redirect from BPF */
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
+		sk = udp4_lookup_run_bpf(net, udptable, skb,
+					 saddr, sport, daddr, hnum);
+		if (sk) {
+			result = sk;
+			goto done;
+		}
 	}
+
+	/* Got non-wildcard socket or error on first lookup */
+	if (result)
+		goto done;
+
+	/* Lookup wildcard sockets */
+	hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
+	slot2 = hash2 & udptable->mask;
+	hslot2 = &udptable->hash2[slot2];
+
+	result = udp4_lib_lookup2(net, saddr, sport,
+				  htonl(INADDR_ANY), hnum, dif, sdif,
+				  hslot2, skb);
+done:
 	if (IS_ERR(result))
 		return NULL;
 	return result;
@@ -844,7 +899,7 @@
 			kfree_skb(skb);
 			return -EINVAL;
 		}
-		if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) {
+		if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) {
 			kfree_skb(skb);
 			return -EINVAL;
 		}
@@ -981,7 +1036,7 @@
 	__be16 dport;
 	u8  tos;
 	int err, is_udplite = IS_UDPLITE(sk);
-	int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
+	int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE;
 	int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
 	struct sk_buff *skb;
 	struct ip_options_data opt_copy;
@@ -1116,7 +1171,7 @@
 		ipc.oif = inet->uc_index;
 	} else if (ipv4_is_lbcast(daddr) && inet->uc_index) {
 		/* oif is set, packet is to local broadcast and
-		 * and uc_index is set. oif is most likely set
+		 * uc_index is set. oif is most likely set
 		 * by sk_bound_dev_if. If uc_index != oif check if the
 		 * oif is an L3 master and uc_index is an L3 slave.
 		 * If so, we want to allow the send using the uc_index.
@@ -1289,7 +1344,7 @@
 	}
 
 	up->len += size;
-	if (!(up->corkflag || (flags&MSG_MORE)))
+	if (!(READ_ONCE(up->corkflag) || (flags&MSG_MORE)))
 		ret = udp_push_pending_frames(sk);
 	if (!ret)
 		ret = size;
@@ -1674,10 +1729,11 @@
 		error = -EAGAIN;
 		do {
 			spin_lock_bh(&queue->lock);
-			skb = __skb_try_recv_from_queue(sk, queue, flags,
-							udp_skb_destructor,
-							off, err, &last);
+			skb = __skb_try_recv_from_queue(sk, queue, flags, off,
+							err, &last);
 			if (skb) {
+				if (!(flags & MSG_PEEK))
+					udp_skb_destructor(sk, skb);
 				spin_unlock_bh(&queue->lock);
 				return skb;
 			}
@@ -1695,9 +1751,10 @@
 			spin_lock(&sk_queue->lock);
 			skb_queue_splice_tail_init(sk_queue, queue);
 
-			skb = __skb_try_recv_from_queue(sk, queue, flags,
-							udp_skb_dtor_locked,
-							off, err, &last);
+			skb = __skb_try_recv_from_queue(sk, queue, flags, off,
+							err, &last);
+			if (skb && !(flags & MSG_PEEK))
+				udp_skb_dtor_locked(sk, skb);
 			spin_unlock(&sk_queue->lock);
 			spin_unlock_bh(&queue->lock);
 			if (skb)
@@ -1712,7 +1769,8 @@
 
 		/* sk_queue is empty, reader_queue may contain peeked packets */
 	} while (timeo &&
-		 !__skb_wait_for_more_packets(sk, &error, &timeo,
+		 !__skb_wait_for_more_packets(sk, &sk->sk_receive_queue,
+					      &error, &timeo,
 					      (struct sk_buff *)sk_queue));
 
 	*err = error;
@@ -2109,11 +2167,10 @@
 	if (likely(!udp_unexpected_gso(sk, skb)))
 		return udp_queue_rcv_one_skb(sk, skb);
 
-	BUILD_BUG_ON(sizeof(struct udp_skb_cb) > SKB_SGO_CB_OFFSET);
+	BUILD_BUG_ON(sizeof(struct udp_skb_cb) > SKB_GSO_CB_OFFSET);
 	__skb_push(skb, -skb_mac_offset(skb));
 	segs = udp_rcv_segment(sk, skb, true);
-	for (skb = segs; skb; skb = next) {
-		next = skb->next;
+	skb_list_walk_safe(segs, skb, next) {
 		__skb_pull(skb, skb_transport_offset(skb));
 		ret = udp_queue_rcv_one_skb(sk, skb);
 		if (ret > 0)
@@ -2289,6 +2346,7 @@
 	struct rtable *rt = skb_rtable(skb);
 	__be32 saddr, daddr;
 	struct net *net = dev_net(skb->dev);
+	bool refcounted;
 
 	/*
 	 *  Validate the packet.
@@ -2314,7 +2372,7 @@
 	if (udp4_csum_init(skb, uh, proto))
 		goto csum_error;
 
-	sk = skb_steal_sock(skb);
+	sk = skb_steal_sock(skb, &refcounted);
 	if (sk) {
 		struct dst_entry *dst = skb_dst(skb);
 		int ret;
@@ -2323,7 +2381,8 @@
 			udp_sk_rx_dst_set(sk, dst);
 
 		ret = udp_unicast_rcv_skb(sk, skb, uh);
-		sock_put(sk);
+		if (refcounted)
+			sock_put(sk);
 		return ret;
 	}
 
@@ -2532,7 +2591,7 @@
  *	Socket option code for UDP
  */
 int udp_lib_setsockopt(struct sock *sk, int level, int optname,
-		       char __user *optval, unsigned int optlen,
+		       sockptr_t optval, unsigned int optlen,
 		       int (*push_pending_frames)(struct sock *))
 {
 	struct udp_sock *up = udp_sk(sk);
@@ -2543,7 +2602,7 @@
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(val)))
 		return -EFAULT;
 
 	valbool = val ? 1 : 0;
@@ -2551,9 +2610,9 @@
 	switch (optname) {
 	case UDP_CORK:
 		if (val != 0) {
-			up->corkflag = 1;
+			WRITE_ONCE(up->corkflag, 1);
 		} else {
-			up->corkflag = 0;
+			WRITE_ONCE(up->corkflag, 0);
 			lock_sock(sk);
 			push_pending_frames(sk);
 			release_sock(sk);
@@ -2563,10 +2622,17 @@
 	case UDP_ENCAP:
 		switch (val) {
 		case 0:
+#ifdef CONFIG_XFRM
 		case UDP_ENCAP_ESPINUDP:
 		case UDP_ENCAP_ESPINUDP_NON_IKE:
-			up->encap_rcv = xfrm4_udp_encap_rcv;
-			/* FALLTHROUGH */
+#if IS_ENABLED(CONFIG_IPV6)
+			if (sk->sk_family == AF_INET6)
+				up->encap_rcv = ipv6_stub->xfrm6_udp_encap_rcv;
+			else
+#endif
+				up->encap_rcv = xfrm4_udp_encap_rcv;
+#endif
+			fallthrough;
 		case UDP_ENCAP_L2TPINUDP:
 			up->encap_type = val;
 			lock_sock(sk);
@@ -2595,9 +2661,12 @@
 
 	case UDP_GRO:
 		lock_sock(sk);
+
+		/* when enabling GRO, accept the related GSO packet type */
 		if (valbool)
 			udp_tunnel_encap_enable(sk->sk_socket);
 		up->gro_enabled = valbool;
+		up->accept_udp_l4 = valbool;
 		release_sock(sk);
 		break;
 
@@ -2640,26 +2709,16 @@
 }
 EXPORT_SYMBOL(udp_lib_setsockopt);
 
-int udp_setsockopt(struct sock *sk, int level, int optname,
-		   char __user *optval, unsigned int optlen)
+int udp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		   unsigned int optlen)
 {
 	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
-		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+		return udp_lib_setsockopt(sk, level, optname,
+					  optval, optlen,
 					  udp_push_pending_frames);
 	return ip_setsockopt(sk, level, optname, optval, optlen);
 }
 
-#ifdef CONFIG_COMPAT
-int compat_udp_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, unsigned int optlen)
-{
-	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
-		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
-					  udp_push_pending_frames);
-	return compat_ip_setsockopt(sk, level, optname, optval, optlen);
-}
-#endif
-
 int udp_lib_getsockopt(struct sock *sk, int level, int optname,
 		       char __user *optval, int __user *optlen)
 {
@@ -2676,7 +2735,7 @@
 
 	switch (optname) {
 	case UDP_CORK:
-		val = up->corkflag;
+		val = READ_ONCE(up->corkflag);
 		break;
 
 	case UDP_ENCAP:
@@ -2729,20 +2788,11 @@
 	return ip_getsockopt(sk, level, optname, optval, optlen);
 }
 
-#ifdef CONFIG_COMPAT
-int compat_udp_getsockopt(struct sock *sk, int level, int optname,
-				 char __user *optval, int __user *optlen)
-{
-	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
-		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
-	return compat_ip_getsockopt(sk, level, optname, optval, optlen);
-}
-#endif
 /**
  * 	udp_poll - wait for a UDP event.
- *	@file - file struct
- *	@sock - socket
- *	@wait - poll table
+ *	@file: - file struct
+ *	@sock: - socket
+ *	@wait: - poll table
  *
  *	This is same as datagram poll, except for the special case of
  *	blocking sockets. If application is using a blocking fd
@@ -2816,10 +2866,6 @@
 	.sysctl_rmem_offset	= offsetof(struct net, ipv4.sysctl_udp_rmem_min),
 	.obj_size		= sizeof(struct udp_sock),
 	.h.udp_table		= &udp_table,
-#ifdef CONFIG_COMPAT
-	.compat_setsockopt	= compat_udp_setsockopt,
-	.compat_getsockopt	= compat_udp_getsockopt,
-#endif
 	.diag_destroy		= udp_abort,
 };
 EXPORT_SYMBOL(udp_prot);
@@ -2830,10 +2876,15 @@
 static struct sock *udp_get_first(struct seq_file *seq, int start)
 {
 	struct sock *sk;
-	struct udp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file));
+	struct udp_seq_afinfo *afinfo;
 	struct udp_iter_state *state = seq->private;
 	struct net *net = seq_file_net(seq);
 
+	if (state->bpf_seq_afinfo)
+		afinfo = state->bpf_seq_afinfo;
+	else
+		afinfo = PDE_DATA(file_inode(seq->file));
+
 	for (state->bucket = start; state->bucket <= afinfo->udp_table->mask;
 	     ++state->bucket) {
 		struct udp_hslot *hslot = &afinfo->udp_table->hash[state->bucket];
@@ -2845,7 +2896,8 @@
 		sk_for_each(sk, &hslot->head) {
 			if (!net_eq(sock_net(sk), net))
 				continue;
-			if (sk->sk_family == afinfo->family)
+			if (afinfo->family == AF_UNSPEC ||
+			    sk->sk_family == afinfo->family)
 				goto found;
 		}
 		spin_unlock_bh(&hslot->lock);
@@ -2857,13 +2909,20 @@
 
 static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
 {
-	struct udp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file));
+	struct udp_seq_afinfo *afinfo;
 	struct udp_iter_state *state = seq->private;
 	struct net *net = seq_file_net(seq);
 
+	if (state->bpf_seq_afinfo)
+		afinfo = state->bpf_seq_afinfo;
+	else
+		afinfo = PDE_DATA(file_inode(seq->file));
+
 	do {
 		sk = sk_next(sk);
-	} while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != afinfo->family));
+	} while (sk && (!net_eq(sock_net(sk), net) ||
+			(afinfo->family != AF_UNSPEC &&
+			 sk->sk_family != afinfo->family)));
 
 	if (!sk) {
 		if (state->bucket <= afinfo->udp_table->mask)
@@ -2908,9 +2967,14 @@
 
 void udp_seq_stop(struct seq_file *seq, void *v)
 {
-	struct udp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file));
+	struct udp_seq_afinfo *afinfo;
 	struct udp_iter_state *state = seq->private;
 
+	if (state->bpf_seq_afinfo)
+		afinfo = state->bpf_seq_afinfo;
+	else
+		afinfo = PDE_DATA(file_inode(seq->file));
+
 	if (state->bucket <= afinfo->udp_table->mask)
 		spin_unlock_bh(&afinfo->udp_table->hash[state->bucket].lock);
 }
@@ -2942,7 +3006,7 @@
 {
 	seq_setwidth(seq, 127);
 	if (v == SEQ_START_TOKEN)
-		seq_puts(seq, "  sl  local_address rem_address   st tx_queue "
+		seq_puts(seq, "   sl  local_address rem_address   st tx_queue "
 			   "rx_queue tr tm->when retrnsmt   uid  timeout "
 			   "inode ref pointer drops");
 	else {
@@ -2954,6 +3018,67 @@
 	return 0;
 }
 
+#ifdef CONFIG_BPF_SYSCALL
+struct bpf_iter__udp {
+	__bpf_md_ptr(struct bpf_iter_meta *, meta);
+	__bpf_md_ptr(struct udp_sock *, udp_sk);
+	uid_t uid __aligned(8);
+	int bucket __aligned(8);
+};
+
+static int udp_prog_seq_show(struct bpf_prog *prog, struct bpf_iter_meta *meta,
+			     struct udp_sock *udp_sk, uid_t uid, int bucket)
+{
+	struct bpf_iter__udp ctx;
+
+	meta->seq_num--;  /* skip SEQ_START_TOKEN */
+	ctx.meta = meta;
+	ctx.udp_sk = udp_sk;
+	ctx.uid = uid;
+	ctx.bucket = bucket;
+	return bpf_iter_run_prog(prog, &ctx);
+}
+
+static int bpf_iter_udp_seq_show(struct seq_file *seq, void *v)
+{
+	struct udp_iter_state *state = seq->private;
+	struct bpf_iter_meta meta;
+	struct bpf_prog *prog;
+	struct sock *sk = v;
+	uid_t uid;
+
+	if (v == SEQ_START_TOKEN)
+		return 0;
+
+	uid = from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk));
+	meta.seq = seq;
+	prog = bpf_iter_get_info(&meta, false);
+	return udp_prog_seq_show(prog, &meta, v, uid, state->bucket);
+}
+
+static void bpf_iter_udp_seq_stop(struct seq_file *seq, void *v)
+{
+	struct bpf_iter_meta meta;
+	struct bpf_prog *prog;
+
+	if (!v) {
+		meta.seq = seq;
+		prog = bpf_iter_get_info(&meta, true);
+		if (prog)
+			(void)udp_prog_seq_show(prog, &meta, v, 0, 0);
+	}
+
+	udp_seq_stop(seq, v);
+}
+
+static const struct seq_operations bpf_iter_udp_seq_ops = {
+	.start		= udp_seq_start,
+	.next		= udp_seq_next,
+	.stop		= bpf_iter_udp_seq_stop,
+	.show		= bpf_iter_udp_seq_show,
+};
+#endif
+
 const struct seq_operations udp_seq_ops = {
 	.start		= udp_seq_start,
 	.next		= udp_seq_next,
@@ -3071,6 +3196,62 @@
 	.init	= udp_sysctl_init,
 };
 
+#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
+DEFINE_BPF_ITER_FUNC(udp, struct bpf_iter_meta *meta,
+		     struct udp_sock *udp_sk, uid_t uid, int bucket)
+
+static int bpf_iter_init_udp(void *priv_data, struct bpf_iter_aux_info *aux)
+{
+	struct udp_iter_state *st = priv_data;
+	struct udp_seq_afinfo *afinfo;
+	int ret;
+
+	afinfo = kmalloc(sizeof(*afinfo), GFP_USER | __GFP_NOWARN);
+	if (!afinfo)
+		return -ENOMEM;
+
+	afinfo->family = AF_UNSPEC;
+	afinfo->udp_table = &udp_table;
+	st->bpf_seq_afinfo = afinfo;
+	ret = bpf_iter_init_seq_net(priv_data, aux);
+	if (ret)
+		kfree(afinfo);
+	return ret;
+}
+
+static void bpf_iter_fini_udp(void *priv_data)
+{
+	struct udp_iter_state *st = priv_data;
+
+	kfree(st->bpf_seq_afinfo);
+	bpf_iter_fini_seq_net(priv_data);
+}
+
+static const struct bpf_iter_seq_info udp_seq_info = {
+	.seq_ops		= &bpf_iter_udp_seq_ops,
+	.init_seq_private	= bpf_iter_init_udp,
+	.fini_seq_private	= bpf_iter_fini_udp,
+	.seq_priv_size		= sizeof(struct udp_iter_state),
+};
+
+static struct bpf_iter_reg udp_reg_info = {
+	.target			= "udp",
+	.ctx_arg_info_size	= 1,
+	.ctx_arg_info		= {
+		{ offsetof(struct bpf_iter__udp, udp_sk),
+		  PTR_TO_BTF_ID_OR_NULL },
+	},
+	.seq_info		= &udp_seq_info,
+};
+
+static void __init bpf_iter_register(void)
+{
+	udp_reg_info.ctx_arg_info[0].btf_id = btf_sock_ids[BTF_SOCK_TYPE_UDP];
+	if (bpf_iter_reg_target(&udp_reg_info))
+		pr_warn("Warning: could not register bpf iterator udp\n");
+}
+#endif
+
 void __init udp_init(void)
 {
 	unsigned long limit;
@@ -3096,4 +3277,8 @@
 
 	if (register_pernet_subsys(&udp_sysctl_ops))
 		panic("UDP: failed to init sysctl parameters.\n");
+
+#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
+	bpf_iter_register();
+#endif
 }
diff --git a/net/ipv4/udp_bpf.c b/net/ipv4/udp_bpf.c
new file mode 100644
index 0000000..69c9663
--- /dev/null
+++ b/net/ipv4/udp_bpf.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Cloudflare Ltd https://cloudflare.com */
+
+#include <linux/skmsg.h>
+#include <net/sock.h>
+#include <net/udp.h>
+
+enum {
+	UDP_BPF_IPV4,
+	UDP_BPF_IPV6,
+	UDP_BPF_NUM_PROTS,
+};
+
+static struct proto *udpv6_prot_saved __read_mostly;
+static DEFINE_SPINLOCK(udpv6_prot_lock);
+static struct proto udp_bpf_prots[UDP_BPF_NUM_PROTS];
+
+static void udp_bpf_rebuild_protos(struct proto *prot, const struct proto *base)
+{
+	*prot        = *base;
+	prot->unhash = sock_map_unhash;
+	prot->close  = sock_map_close;
+}
+
+static void udp_bpf_check_v6_needs_rebuild(struct proto *ops)
+{
+	if (unlikely(ops != smp_load_acquire(&udpv6_prot_saved))) {
+		spin_lock_bh(&udpv6_prot_lock);
+		if (likely(ops != udpv6_prot_saved)) {
+			udp_bpf_rebuild_protos(&udp_bpf_prots[UDP_BPF_IPV6], ops);
+			smp_store_release(&udpv6_prot_saved, ops);
+		}
+		spin_unlock_bh(&udpv6_prot_lock);
+	}
+}
+
+static int __init udp_bpf_v4_build_proto(void)
+{
+	udp_bpf_rebuild_protos(&udp_bpf_prots[UDP_BPF_IPV4], &udp_prot);
+	return 0;
+}
+late_initcall(udp_bpf_v4_build_proto);
+
+struct proto *udp_bpf_get_proto(struct sock *sk, struct sk_psock *psock)
+{
+	int family = sk->sk_family == AF_INET ? UDP_BPF_IPV4 : UDP_BPF_IPV6;
+
+	if (sk->sk_family == AF_INET6)
+		udp_bpf_check_v6_needs_rebuild(psock->sk_proto);
+
+	return &udp_bpf_prots[family];
+}
diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c
index dccd228..1dbece3 100644
--- a/net/ipv4/udp_diag.c
+++ b/net/ipv4/udp_diag.c
@@ -21,16 +21,15 @@
 	if (!inet_diag_bc_sk(bc, sk))
 		return 0;
 
-	return inet_sk_diag_fill(sk, NULL, skb, req,
-			sk_user_ns(NETLINK_CB(cb->skb).sk),
-			NETLINK_CB(cb->skb).portid,
-			cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, net_admin);
+	return inet_sk_diag_fill(sk, NULL, skb, cb, req, NLM_F_MULTI,
+				 net_admin);
 }
 
-static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
-			const struct nlmsghdr *nlh,
+static int udp_dump_one(struct udp_table *tbl,
+			struct netlink_callback *cb,
 			const struct inet_diag_req_v2 *req)
 {
+	struct sk_buff *in_skb = cb->skb;
 	int err = -EINVAL;
 	struct sock *sk = NULL;
 	struct sk_buff *rep;
@@ -71,11 +70,8 @@
 	if (!rep)
 		goto out;
 
-	err = inet_sk_diag_fill(sk, NULL, rep, req,
-			   sk_user_ns(NETLINK_CB(in_skb).sk),
-			   NETLINK_CB(in_skb).portid,
-			   nlh->nlmsg_seq, 0, nlh,
-			   netlink_net_capable(in_skb, CAP_NET_ADMIN));
+	err = inet_sk_diag_fill(sk, NULL, rep, cb, req, 0,
+				netlink_net_capable(in_skb, CAP_NET_ADMIN));
 	if (err < 0) {
 		WARN_ON(err == -EMSGSIZE);
 		kfree_skb(rep);
@@ -94,12 +90,16 @@
 
 static void udp_dump(struct udp_table *table, struct sk_buff *skb,
 		     struct netlink_callback *cb,
-		     const struct inet_diag_req_v2 *r, struct nlattr *bc)
+		     const struct inet_diag_req_v2 *r)
 {
 	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
 	struct net *net = sock_net(skb->sk);
+	struct inet_diag_dump_data *cb_data;
 	int num, s_num, slot, s_slot;
+	struct nlattr *bc;
 
+	cb_data = cb->data;
+	bc = cb_data->inet_diag_nla_bc;
 	s_slot = cb->args[0];
 	num = s_num = cb->args[1];
 
@@ -147,15 +147,15 @@
 }
 
 static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
-			  const struct inet_diag_req_v2 *r, struct nlattr *bc)
+			  const struct inet_diag_req_v2 *r)
 {
-	udp_dump(&udp_table, skb, cb, r, bc);
+	udp_dump(&udp_table, skb, cb, r);
 }
 
-static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
+static int udp_diag_dump_one(struct netlink_callback *cb,
 			     const struct inet_diag_req_v2 *req)
 {
-	return udp_dump_one(&udp_table, in_skb, nlh, req);
+	return udp_dump_one(&udp_table, cb, req);
 }
 
 static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
@@ -250,16 +250,15 @@
 };
 
 static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
-			      const struct inet_diag_req_v2 *r,
-			      struct nlattr *bc)
+			      const struct inet_diag_req_v2 *r)
 {
-	udp_dump(&udplite_table, skb, cb, r, bc);
+	udp_dump(&udplite_table, skb, cb, r);
 }
 
-static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
+static int udplite_diag_dump_one(struct netlink_callback *cb,
 				 const struct inet_diag_req_v2 *req)
 {
-	return udp_dump_one(&udplite_table, in_skb, nlh, req);
+	return udp_dump_one(&udplite_table, cb, req);
 }
 
 static const struct inet_diag_handler udplite_diag_handler = {
diff --git a/net/ipv4/udp_impl.h b/net/ipv4/udp_impl.h
index 6b2fa77..2878d82 100644
--- a/net/ipv4/udp_impl.h
+++ b/net/ipv4/udp_impl.h
@@ -12,17 +12,11 @@
 int udp_v4_get_port(struct sock *sk, unsigned short snum);
 void udp_v4_rehash(struct sock *sk);
 
-int udp_setsockopt(struct sock *sk, int level, int optname,
-		   char __user *optval, unsigned int optlen);
+int udp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		   unsigned int optlen);
 int udp_getsockopt(struct sock *sk, int level, int optname,
 		   char __user *optval, int __user *optlen);
 
-#ifdef CONFIG_COMPAT
-int compat_udp_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, unsigned int optlen);
-int compat_udp_getsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, int __user *optlen);
-#endif
 int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
 		int flags, int *addr_len);
 int udp_sendpage(struct sock *sk, struct page *page, int offset, size_t size,
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 487a92d..f4b8e56 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -184,8 +184,81 @@
 }
 EXPORT_SYMBOL(skb_udp_tunnel_segment);
 
+static void __udpv4_gso_segment_csum(struct sk_buff *seg,
+				     __be32 *oldip, __be32 *newip,
+				     __be16 *oldport, __be16 *newport)
+{
+	struct udphdr *uh;
+	struct iphdr *iph;
+
+	if (*oldip == *newip && *oldport == *newport)
+		return;
+
+	uh = udp_hdr(seg);
+	iph = ip_hdr(seg);
+
+	if (uh->check) {
+		inet_proto_csum_replace4(&uh->check, seg, *oldip, *newip,
+					 true);
+		inet_proto_csum_replace2(&uh->check, seg, *oldport, *newport,
+					 false);
+		if (!uh->check)
+			uh->check = CSUM_MANGLED_0;
+	}
+	*oldport = *newport;
+
+	csum_replace4(&iph->check, *oldip, *newip);
+	*oldip = *newip;
+}
+
+static struct sk_buff *__udpv4_gso_segment_list_csum(struct sk_buff *segs)
+{
+	struct sk_buff *seg;
+	struct udphdr *uh, *uh2;
+	struct iphdr *iph, *iph2;
+
+	seg = segs;
+	uh = udp_hdr(seg);
+	iph = ip_hdr(seg);
+
+	if ((udp_hdr(seg)->dest == udp_hdr(seg->next)->dest) &&
+	    (udp_hdr(seg)->source == udp_hdr(seg->next)->source) &&
+	    (ip_hdr(seg)->daddr == ip_hdr(seg->next)->daddr) &&
+	    (ip_hdr(seg)->saddr == ip_hdr(seg->next)->saddr))
+		return segs;
+
+	while ((seg = seg->next)) {
+		uh2 = udp_hdr(seg);
+		iph2 = ip_hdr(seg);
+
+		__udpv4_gso_segment_csum(seg,
+					 &iph2->saddr, &iph->saddr,
+					 &uh2->source, &uh->source);
+		__udpv4_gso_segment_csum(seg,
+					 &iph2->daddr, &iph->daddr,
+					 &uh2->dest, &uh->dest);
+	}
+
+	return segs;
+}
+
+static struct sk_buff *__udp_gso_segment_list(struct sk_buff *skb,
+					      netdev_features_t features,
+					      bool is_ipv6)
+{
+	unsigned int mss = skb_shinfo(skb)->gso_size;
+
+	skb = skb_segment_list(skb, features, skb_mac_header_len(skb));
+	if (IS_ERR(skb))
+		return skb;
+
+	udp_hdr(skb)->len = htons(sizeof(struct udphdr) + mss);
+
+	return is_ipv6 ? skb : __udpv4_gso_segment_list_csum(skb);
+}
+
 struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
-				  netdev_features_t features)
+				  netdev_features_t features, bool is_ipv6)
 {
 	struct sock *sk = gso_skb->sk;
 	unsigned int sum_truesize = 0;
@@ -196,6 +269,9 @@
 	__sum16 check;
 	__be16 newlen;
 
+	if (skb_shinfo(gso_skb)->gso_type & SKB_GSO_FRAGLIST)
+		return __udp_gso_segment_list(gso_skb, features, is_ipv6);
+
 	mss = skb_shinfo(gso_skb)->gso_size;
 	if (gso_skb->len <= sizeof(*uh) + mss)
 		return ERR_PTR(-EINVAL);
@@ -308,7 +384,7 @@
 		goto out;
 
 	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
-		return __udp_gso_segment(skb, features);
+		return __udp_gso_segment(skb, features, false);
 
 	mss = skb_shinfo(skb)->gso_size;
 	if (unlikely(skb->len <= mss))
@@ -354,6 +430,7 @@
 	struct udphdr *uh2;
 	struct sk_buff *p;
 	unsigned int ulen;
+	int ret = 0;
 
 	/* requires non zero csum, for symmetry with GSO */
 	if (!uh->check) {
@@ -369,7 +446,6 @@
 	}
 	/* pull encapsulating udp header */
 	skb_gro_pull(skb, sizeof(struct udphdr));
-	skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr));
 
 	list_for_each_entry(p, head, list) {
 		if (!NAPI_GRO_CB(p)->same_flow)
@@ -383,14 +459,40 @@
 			continue;
 		}
 
+		if (NAPI_GRO_CB(skb)->is_flist != NAPI_GRO_CB(p)->is_flist) {
+			NAPI_GRO_CB(skb)->flush = 1;
+			return p;
+		}
+
 		/* Terminate the flow on len mismatch or if it grow "too much".
 		 * Under small packet flood GRO count could elsewhere grow a lot
 		 * leading to excessive truesize values.
 		 * On len mismatch merge the first packet shorter than gso_size,
 		 * otherwise complete the GRO packet.
 		 */
-		if (ulen > ntohs(uh2->len) || skb_gro_receive(p, skb) ||
-		    ulen != ntohs(uh2->len) ||
+		if (ulen > ntohs(uh2->len)) {
+			pp = p;
+		} else {
+			if (NAPI_GRO_CB(skb)->is_flist) {
+				if (!pskb_may_pull(skb, skb_gro_offset(skb))) {
+					NAPI_GRO_CB(skb)->flush = 1;
+					return NULL;
+				}
+				if ((skb->ip_summed != p->ip_summed) ||
+				    (skb->csum_level != p->csum_level)) {
+					NAPI_GRO_CB(skb)->flush = 1;
+					return NULL;
+				}
+				ret = skb_gro_receive_list(p, skb);
+			} else {
+				skb_gro_postpull_rcsum(skb, uh,
+						       sizeof(struct udphdr));
+
+				ret = skb_gro_receive(p, skb);
+			}
+		}
+
+		if (ret || ulen != ntohs(uh2->len) ||
 		    NAPI_GRO_CB(p)->count >= UDP_GRO_CNT_MAX)
 			pp = p;
 
@@ -401,36 +503,30 @@
 	return NULL;
 }
 
-INDIRECT_CALLABLE_DECLARE(struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
-						   __be16 sport, __be16 dport));
 struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
-				struct udphdr *uh, udp_lookup_t lookup)
+				struct udphdr *uh, struct sock *sk)
 {
 	struct sk_buff *pp = NULL;
 	struct sk_buff *p;
 	struct udphdr *uh2;
 	unsigned int off = skb_gro_offset(skb);
 	int flush = 1;
-	struct sock *sk;
 
-	rcu_read_lock();
-	sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb,
-				udp4_lib_lookup_skb, skb, uh->source, uh->dest);
-	if (!sk)
-		goto out_unlock;
+	NAPI_GRO_CB(skb)->is_flist = 0;
+	if (skb->dev->features & NETIF_F_GRO_FRAGLIST)
+		NAPI_GRO_CB(skb)->is_flist = sk ? !udp_sk(sk)->gro_enabled: 1;
 
-	if (udp_sk(sk)->gro_enabled) {
+	if ((sk && udp_sk(sk)->gro_enabled) || NAPI_GRO_CB(skb)->is_flist) {
 		pp = call_gro_receive(udp_gro_receive_segment, head, skb);
-		rcu_read_unlock();
 		return pp;
 	}
 
-	if (NAPI_GRO_CB(skb)->encap_mark ||
+	if (!sk || NAPI_GRO_CB(skb)->encap_mark ||
 	    (uh->check && skb->ip_summed != CHECKSUM_PARTIAL &&
 	     NAPI_GRO_CB(skb)->csum_cnt == 0 &&
 	     !NAPI_GRO_CB(skb)->csum_valid) ||
 	    !udp_sk(sk)->gro_receive)
-		goto out_unlock;
+		goto out;
 
 	/* mark that this skb passed once through the tunnel gro layer */
 	NAPI_GRO_CB(skb)->encap_mark = 1;
@@ -457,19 +553,30 @@
 	skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr));
 	pp = call_gro_receive_sk(udp_sk(sk)->gro_receive, sk, head, skb);
 
-out_unlock:
-	rcu_read_unlock();
+out:
 	skb_gro_flush_final(skb, pp, flush);
 	return pp;
 }
 EXPORT_SYMBOL(udp_gro_receive);
 
+static struct sock *udp4_gro_lookup_skb(struct sk_buff *skb, __be16 sport,
+					__be16 dport)
+{
+	const struct iphdr *iph = skb_gro_network_header(skb);
+
+	return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport,
+				 iph->daddr, dport, inet_iif(skb),
+				 inet_sdif(skb), &udp_table, NULL);
+}
+
 INDIRECT_CALLABLE_SCOPE
 struct sk_buff *udp4_gro_receive(struct list_head *head, struct sk_buff *skb)
 {
 	struct udphdr *uh = udp_gro_udphdr(skb);
+	struct sock *sk = NULL;
+	struct sk_buff *pp;
 
-	if (unlikely(!uh) || !static_branch_unlikely(&udp_encap_needed_key))
+	if (unlikely(!uh))
 		goto flush;
 
 	/* Don't bother verifying checksum if we're going to flush anyway. */
@@ -480,11 +587,18 @@
 						 inet_gro_compute_pseudo))
 		goto flush;
 	else if (uh->check)
-		skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
+		skb_gro_checksum_try_convert(skb, IPPROTO_UDP,
 					     inet_gro_compute_pseudo);
 skip:
 	NAPI_GRO_CB(skb)->is_ipv6 = 0;
-	return udp_gro_receive(head, skb, uh, udp4_lib_lookup_skb);
+	rcu_read_lock();
+
+	if (static_branch_unlikely(&udp_encap_needed_key))
+		sk = udp4_gro_lookup_skb(skb, uh->source, uh->dest);
+
+	pp = udp_gro_receive(head, skb, uh, sk);
+	rcu_read_unlock();
+	return pp;
 
 flush:
 	NAPI_GRO_CB(skb)->flush = 1;
@@ -521,9 +635,7 @@
 	rcu_read_lock();
 	sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb,
 				udp4_lib_lookup_skb, skb, uh->source, uh->dest);
-	if (sk && udp_sk(sk)->gro_enabled) {
-		err = udp_gro_complete_segment(skb);
-	} else if (sk && udp_sk(sk)->gro_complete) {
+	if (sk && udp_sk(sk)->gro_complete) {
 		skb_shinfo(skb)->gso_type = uh->check ? SKB_GSO_UDP_TUNNEL_CSUM
 					: SKB_GSO_UDP_TUNNEL;
 
@@ -533,6 +645,8 @@
 		skb->encapsulation = 1;
 		err = udp_sk(sk)->gro_complete(sk, skb,
 				nhoff + sizeof(struct udphdr));
+	} else {
+		err = udp_gro_complete_segment(skb);
 	}
 	rcu_read_unlock();
 
@@ -548,6 +662,23 @@
 	const struct iphdr *iph = ip_hdr(skb);
 	struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
 
+	if (NAPI_GRO_CB(skb)->is_flist) {
+		uh->len = htons(skb->len - nhoff);
+
+		skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
+		skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
+
+		if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
+			if (skb->csum_level < SKB_MAX_CSUM_LEVEL)
+				skb->csum_level++;
+		} else {
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+			skb->csum_level = 0;
+		}
+
+		return 0;
+	}
+
 	if (uh->check)
 		uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr,
 					  iph->daddr, 0);
diff --git a/net/ipv4/udp_tunnel.c b/net/ipv4/udp_tunnel_core.c
similarity index 97%
rename from net/ipv4/udp_tunnel.c
rename to net/ipv4/udp_tunnel_core.c
index 150e6f0..3eecba0 100644
--- a/net/ipv4/udp_tunnel.c
+++ b/net/ipv4/udp_tunnel_core.c
@@ -22,9 +22,7 @@
 		goto error;
 
 	if (cfg->bind_ifindex) {
-		err = kernel_setsockopt(sock, SOL_SOCKET, SO_BINDTOIFINDEX,
-					(void *)&cfg->bind_ifindex,
-					sizeof(cfg->bind_ifindex));
+		err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true);
 		if (err < 0)
 			goto error;
 	}
diff --git a/net/ipv4/udp_tunnel_nic.c b/net/ipv4/udp_tunnel_nic.c
new file mode 100644
index 0000000..bc3a043
--- /dev/null
+++ b/net/ipv4/udp_tunnel_nic.c
@@ -0,0 +1,973 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2020 Facebook Inc.
+
+#include <linux/ethtool_netlink.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+#include <net/udp_tunnel.h>
+#include <net/vxlan.h>
+
+enum udp_tunnel_nic_table_entry_flags {
+	UDP_TUNNEL_NIC_ENTRY_ADD	= BIT(0),
+	UDP_TUNNEL_NIC_ENTRY_DEL	= BIT(1),
+	UDP_TUNNEL_NIC_ENTRY_OP_FAIL	= BIT(2),
+	UDP_TUNNEL_NIC_ENTRY_FROZEN	= BIT(3),
+};
+
+struct udp_tunnel_nic_table_entry {
+	__be16 port;
+	u8 type;
+	u8 flags;
+	u16 use_cnt;
+#define UDP_TUNNEL_NIC_USE_CNT_MAX	U16_MAX
+	u8 hw_priv;
+};
+
+/**
+ * struct udp_tunnel_nic - UDP tunnel port offload state
+ * @work:	async work for talking to hardware from process context
+ * @dev:	netdev pointer
+ * @need_sync:	at least one port start changed
+ * @need_replay: space was freed, we need a replay of all ports
+ * @work_pending: @work is currently scheduled
+ * @n_tables:	number of tables under @entries
+ * @missed:	bitmap of tables which overflown
+ * @entries:	table of tables of ports currently offloaded
+ */
+struct udp_tunnel_nic {
+	struct work_struct work;
+
+	struct net_device *dev;
+
+	u8 need_sync:1;
+	u8 need_replay:1;
+	u8 work_pending:1;
+
+	unsigned int n_tables;
+	unsigned long missed;
+	struct udp_tunnel_nic_table_entry **entries;
+};
+
+/* We ensure all work structs are done using driver state, but not the code.
+ * We need a workqueue we can flush before module gets removed.
+ */
+static struct workqueue_struct *udp_tunnel_nic_workqueue;
+
+static const char *udp_tunnel_nic_tunnel_type_name(unsigned int type)
+{
+	switch (type) {
+	case UDP_TUNNEL_TYPE_VXLAN:
+		return "vxlan";
+	case UDP_TUNNEL_TYPE_GENEVE:
+		return "geneve";
+	case UDP_TUNNEL_TYPE_VXLAN_GPE:
+		return "vxlan-gpe";
+	default:
+		return "unknown";
+	}
+}
+
+static bool
+udp_tunnel_nic_entry_is_free(struct udp_tunnel_nic_table_entry *entry)
+{
+	return entry->use_cnt == 0 && !entry->flags;
+}
+
+static bool
+udp_tunnel_nic_entry_is_present(struct udp_tunnel_nic_table_entry *entry)
+{
+	return entry->use_cnt && !(entry->flags & ~UDP_TUNNEL_NIC_ENTRY_FROZEN);
+}
+
+static bool
+udp_tunnel_nic_entry_is_frozen(struct udp_tunnel_nic_table_entry *entry)
+{
+	return entry->flags & UDP_TUNNEL_NIC_ENTRY_FROZEN;
+}
+
+static void
+udp_tunnel_nic_entry_freeze_used(struct udp_tunnel_nic_table_entry *entry)
+{
+	if (!udp_tunnel_nic_entry_is_free(entry))
+		entry->flags |= UDP_TUNNEL_NIC_ENTRY_FROZEN;
+}
+
+static void
+udp_tunnel_nic_entry_unfreeze(struct udp_tunnel_nic_table_entry *entry)
+{
+	entry->flags &= ~UDP_TUNNEL_NIC_ENTRY_FROZEN;
+}
+
+static bool
+udp_tunnel_nic_entry_is_queued(struct udp_tunnel_nic_table_entry *entry)
+{
+	return entry->flags & (UDP_TUNNEL_NIC_ENTRY_ADD |
+			       UDP_TUNNEL_NIC_ENTRY_DEL);
+}
+
+static void
+udp_tunnel_nic_entry_queue(struct udp_tunnel_nic *utn,
+			   struct udp_tunnel_nic_table_entry *entry,
+			   unsigned int flag)
+{
+	entry->flags |= flag;
+	utn->need_sync = 1;
+}
+
+static void
+udp_tunnel_nic_ti_from_entry(struct udp_tunnel_nic_table_entry *entry,
+			     struct udp_tunnel_info *ti)
+{
+	memset(ti, 0, sizeof(*ti));
+	ti->port = entry->port;
+	ti->type = entry->type;
+	ti->hw_priv = entry->hw_priv;
+}
+
+static bool
+udp_tunnel_nic_is_empty(struct net_device *dev, struct udp_tunnel_nic *utn)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	unsigned int i, j;
+
+	for (i = 0; i < utn->n_tables; i++)
+		for (j = 0; j < info->tables[i].n_entries; j++)
+			if (!udp_tunnel_nic_entry_is_free(&utn->entries[i][j]))
+				return false;
+	return true;
+}
+
+static bool
+udp_tunnel_nic_should_replay(struct net_device *dev, struct udp_tunnel_nic *utn)
+{
+	const struct udp_tunnel_nic_table_info *table;
+	unsigned int i, j;
+
+	if (!utn->missed)
+		return false;
+
+	for (i = 0; i < utn->n_tables; i++) {
+		table = &dev->udp_tunnel_nic_info->tables[i];
+		if (!test_bit(i, &utn->missed))
+			continue;
+
+		for (j = 0; j < table->n_entries; j++)
+			if (udp_tunnel_nic_entry_is_free(&utn->entries[i][j]))
+				return true;
+	}
+
+	return false;
+}
+
+static void
+__udp_tunnel_nic_get_port(struct net_device *dev, unsigned int table,
+			  unsigned int idx, struct udp_tunnel_info *ti)
+{
+	struct udp_tunnel_nic_table_entry *entry;
+	struct udp_tunnel_nic *utn;
+
+	utn = dev->udp_tunnel_nic;
+	entry = &utn->entries[table][idx];
+
+	if (entry->use_cnt)
+		udp_tunnel_nic_ti_from_entry(entry, ti);
+}
+
+static void
+__udp_tunnel_nic_set_port_priv(struct net_device *dev, unsigned int table,
+			       unsigned int idx, u8 priv)
+{
+	dev->udp_tunnel_nic->entries[table][idx].hw_priv = priv;
+}
+
+static void
+udp_tunnel_nic_entry_update_done(struct udp_tunnel_nic_table_entry *entry,
+				 int err)
+{
+	bool dodgy = entry->flags & UDP_TUNNEL_NIC_ENTRY_OP_FAIL;
+
+	WARN_ON_ONCE(entry->flags & UDP_TUNNEL_NIC_ENTRY_ADD &&
+		     entry->flags & UDP_TUNNEL_NIC_ENTRY_DEL);
+
+	if (entry->flags & UDP_TUNNEL_NIC_ENTRY_ADD &&
+	    (!err || (err == -EEXIST && dodgy)))
+		entry->flags &= ~UDP_TUNNEL_NIC_ENTRY_ADD;
+
+	if (entry->flags & UDP_TUNNEL_NIC_ENTRY_DEL &&
+	    (!err || (err == -ENOENT && dodgy)))
+		entry->flags &= ~UDP_TUNNEL_NIC_ENTRY_DEL;
+
+	if (!err)
+		entry->flags &= ~UDP_TUNNEL_NIC_ENTRY_OP_FAIL;
+	else
+		entry->flags |= UDP_TUNNEL_NIC_ENTRY_OP_FAIL;
+}
+
+static void
+udp_tunnel_nic_device_sync_one(struct net_device *dev,
+			       struct udp_tunnel_nic *utn,
+			       unsigned int table, unsigned int idx)
+{
+	struct udp_tunnel_nic_table_entry *entry;
+	struct udp_tunnel_info ti;
+	int err;
+
+	entry = &utn->entries[table][idx];
+	if (!udp_tunnel_nic_entry_is_queued(entry))
+		return;
+
+	udp_tunnel_nic_ti_from_entry(entry, &ti);
+	if (entry->flags & UDP_TUNNEL_NIC_ENTRY_ADD)
+		err = dev->udp_tunnel_nic_info->set_port(dev, table, idx, &ti);
+	else
+		err = dev->udp_tunnel_nic_info->unset_port(dev, table, idx,
+							   &ti);
+	udp_tunnel_nic_entry_update_done(entry, err);
+
+	if (err)
+		netdev_warn(dev,
+			    "UDP tunnel port sync failed port %d type %s: %d\n",
+			    be16_to_cpu(entry->port),
+			    udp_tunnel_nic_tunnel_type_name(entry->type),
+			    err);
+}
+
+static void
+udp_tunnel_nic_device_sync_by_port(struct net_device *dev,
+				   struct udp_tunnel_nic *utn)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	unsigned int i, j;
+
+	for (i = 0; i < utn->n_tables; i++)
+		for (j = 0; j < info->tables[i].n_entries; j++)
+			udp_tunnel_nic_device_sync_one(dev, utn, i, j);
+}
+
+static void
+udp_tunnel_nic_device_sync_by_table(struct net_device *dev,
+				    struct udp_tunnel_nic *utn)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	unsigned int i, j;
+	int err;
+
+	for (i = 0; i < utn->n_tables; i++) {
+		/* Find something that needs sync in this table */
+		for (j = 0; j < info->tables[i].n_entries; j++)
+			if (udp_tunnel_nic_entry_is_queued(&utn->entries[i][j]))
+				break;
+		if (j == info->tables[i].n_entries)
+			continue;
+
+		err = info->sync_table(dev, i);
+		if (err)
+			netdev_warn(dev, "UDP tunnel port sync failed for table %d: %d\n",
+				    i, err);
+
+		for (j = 0; j < info->tables[i].n_entries; j++) {
+			struct udp_tunnel_nic_table_entry *entry;
+
+			entry = &utn->entries[i][j];
+			if (udp_tunnel_nic_entry_is_queued(entry))
+				udp_tunnel_nic_entry_update_done(entry, err);
+		}
+	}
+}
+
+static void
+__udp_tunnel_nic_device_sync(struct net_device *dev, struct udp_tunnel_nic *utn)
+{
+	if (!utn->need_sync)
+		return;
+
+	if (dev->udp_tunnel_nic_info->sync_table)
+		udp_tunnel_nic_device_sync_by_table(dev, utn);
+	else
+		udp_tunnel_nic_device_sync_by_port(dev, utn);
+
+	utn->need_sync = 0;
+	/* Can't replay directly here, in case we come from the tunnel driver's
+	 * notification - trying to replay may deadlock inside tunnel driver.
+	 */
+	utn->need_replay = udp_tunnel_nic_should_replay(dev, utn);
+}
+
+static void
+udp_tunnel_nic_device_sync(struct net_device *dev, struct udp_tunnel_nic *utn)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	bool may_sleep;
+
+	if (!utn->need_sync)
+		return;
+
+	/* Drivers which sleep in the callback need to update from
+	 * the workqueue, if we come from the tunnel driver's notification.
+	 */
+	may_sleep = info->flags & UDP_TUNNEL_NIC_INFO_MAY_SLEEP;
+	if (!may_sleep)
+		__udp_tunnel_nic_device_sync(dev, utn);
+	if (may_sleep || utn->need_replay) {
+		queue_work(udp_tunnel_nic_workqueue, &utn->work);
+		utn->work_pending = 1;
+	}
+}
+
+static bool
+udp_tunnel_nic_table_is_capable(const struct udp_tunnel_nic_table_info *table,
+				struct udp_tunnel_info *ti)
+{
+	return table->tunnel_types & ti->type;
+}
+
+static bool
+udp_tunnel_nic_is_capable(struct net_device *dev, struct udp_tunnel_nic *utn,
+			  struct udp_tunnel_info *ti)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	unsigned int i;
+
+	/* Special case IPv4-only NICs */
+	if (info->flags & UDP_TUNNEL_NIC_INFO_IPV4_ONLY &&
+	    ti->sa_family != AF_INET)
+		return false;
+
+	for (i = 0; i < utn->n_tables; i++)
+		if (udp_tunnel_nic_table_is_capable(&info->tables[i], ti))
+			return true;
+	return false;
+}
+
+static int
+udp_tunnel_nic_has_collision(struct net_device *dev, struct udp_tunnel_nic *utn,
+			     struct udp_tunnel_info *ti)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	struct udp_tunnel_nic_table_entry *entry;
+	unsigned int i, j;
+
+	for (i = 0; i < utn->n_tables; i++)
+		for (j = 0; j < info->tables[i].n_entries; j++) {
+			entry =	&utn->entries[i][j];
+
+			if (!udp_tunnel_nic_entry_is_free(entry) &&
+			    entry->port == ti->port &&
+			    entry->type != ti->type) {
+				__set_bit(i, &utn->missed);
+				return true;
+			}
+		}
+	return false;
+}
+
+static void
+udp_tunnel_nic_entry_adj(struct udp_tunnel_nic *utn,
+			 unsigned int table, unsigned int idx, int use_cnt_adj)
+{
+	struct udp_tunnel_nic_table_entry *entry =  &utn->entries[table][idx];
+	bool dodgy = entry->flags & UDP_TUNNEL_NIC_ENTRY_OP_FAIL;
+	unsigned int from, to;
+
+	WARN_ON(entry->use_cnt + (u32)use_cnt_adj > U16_MAX);
+
+	/* If not going from used to unused or vice versa - all done.
+	 * For dodgy entries make sure we try to sync again (queue the entry).
+	 */
+	entry->use_cnt += use_cnt_adj;
+	if (!dodgy && !entry->use_cnt == !(entry->use_cnt - use_cnt_adj))
+		return;
+
+	/* Cancel the op before it was sent to the device, if possible,
+	 * otherwise we'd need to take special care to issue commands
+	 * in the same order the ports arrived.
+	 */
+	if (use_cnt_adj < 0) {
+		from = UDP_TUNNEL_NIC_ENTRY_ADD;
+		to = UDP_TUNNEL_NIC_ENTRY_DEL;
+	} else {
+		from = UDP_TUNNEL_NIC_ENTRY_DEL;
+		to = UDP_TUNNEL_NIC_ENTRY_ADD;
+	}
+
+	if (entry->flags & from) {
+		entry->flags &= ~from;
+		if (!dodgy)
+			return;
+	}
+
+	udp_tunnel_nic_entry_queue(utn, entry, to);
+}
+
+static bool
+udp_tunnel_nic_entry_try_adj(struct udp_tunnel_nic *utn,
+			     unsigned int table, unsigned int idx,
+			     struct udp_tunnel_info *ti, int use_cnt_adj)
+{
+	struct udp_tunnel_nic_table_entry *entry =  &utn->entries[table][idx];
+
+	if (udp_tunnel_nic_entry_is_free(entry) ||
+	    entry->port != ti->port ||
+	    entry->type != ti->type)
+		return false;
+
+	if (udp_tunnel_nic_entry_is_frozen(entry))
+		return true;
+
+	udp_tunnel_nic_entry_adj(utn, table, idx, use_cnt_adj);
+	return true;
+}
+
+/* Try to find existing matching entry and adjust its use count, instead of
+ * adding a new one. Returns true if entry was found. In case of delete the
+ * entry may have gotten removed in the process, in which case it will be
+ * queued for removal.
+ */
+static bool
+udp_tunnel_nic_try_existing(struct net_device *dev, struct udp_tunnel_nic *utn,
+			    struct udp_tunnel_info *ti, int use_cnt_adj)
+{
+	const struct udp_tunnel_nic_table_info *table;
+	unsigned int i, j;
+
+	for (i = 0; i < utn->n_tables; i++) {
+		table = &dev->udp_tunnel_nic_info->tables[i];
+		if (!udp_tunnel_nic_table_is_capable(table, ti))
+			continue;
+
+		for (j = 0; j < table->n_entries; j++)
+			if (udp_tunnel_nic_entry_try_adj(utn, i, j, ti,
+							 use_cnt_adj))
+				return true;
+	}
+
+	return false;
+}
+
+static bool
+udp_tunnel_nic_add_existing(struct net_device *dev, struct udp_tunnel_nic *utn,
+			    struct udp_tunnel_info *ti)
+{
+	return udp_tunnel_nic_try_existing(dev, utn, ti, +1);
+}
+
+static bool
+udp_tunnel_nic_del_existing(struct net_device *dev, struct udp_tunnel_nic *utn,
+			    struct udp_tunnel_info *ti)
+{
+	return udp_tunnel_nic_try_existing(dev, utn, ti, -1);
+}
+
+static bool
+udp_tunnel_nic_add_new(struct net_device *dev, struct udp_tunnel_nic *utn,
+		       struct udp_tunnel_info *ti)
+{
+	const struct udp_tunnel_nic_table_info *table;
+	unsigned int i, j;
+
+	for (i = 0; i < utn->n_tables; i++) {
+		table = &dev->udp_tunnel_nic_info->tables[i];
+		if (!udp_tunnel_nic_table_is_capable(table, ti))
+			continue;
+
+		for (j = 0; j < table->n_entries; j++) {
+			struct udp_tunnel_nic_table_entry *entry;
+
+			entry = &utn->entries[i][j];
+			if (!udp_tunnel_nic_entry_is_free(entry))
+				continue;
+
+			entry->port = ti->port;
+			entry->type = ti->type;
+			entry->use_cnt = 1;
+			udp_tunnel_nic_entry_queue(utn, entry,
+						   UDP_TUNNEL_NIC_ENTRY_ADD);
+			return true;
+		}
+
+		/* The different table may still fit this port in, but there
+		 * are no devices currently which have multiple tables accepting
+		 * the same tunnel type, and false positives are okay.
+		 */
+		__set_bit(i, &utn->missed);
+	}
+
+	return false;
+}
+
+static void
+__udp_tunnel_nic_add_port(struct net_device *dev, struct udp_tunnel_info *ti)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	struct udp_tunnel_nic *utn;
+
+	utn = dev->udp_tunnel_nic;
+	if (!utn)
+		return;
+	if (!netif_running(dev) && info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY)
+		return;
+	if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN &&
+	    ti->port == htons(IANA_VXLAN_UDP_PORT)) {
+		if (ti->type != UDP_TUNNEL_TYPE_VXLAN)
+			netdev_warn(dev, "device assumes port 4789 will be used by vxlan tunnels\n");
+		return;
+	}
+
+	if (!udp_tunnel_nic_is_capable(dev, utn, ti))
+		return;
+
+	/* It may happen that a tunnel of one type is removed and different
+	 * tunnel type tries to reuse its port before the device was informed.
+	 * Rely on utn->missed to re-add this port later.
+	 */
+	if (udp_tunnel_nic_has_collision(dev, utn, ti))
+		return;
+
+	if (!udp_tunnel_nic_add_existing(dev, utn, ti))
+		udp_tunnel_nic_add_new(dev, utn, ti);
+
+	udp_tunnel_nic_device_sync(dev, utn);
+}
+
+static void
+__udp_tunnel_nic_del_port(struct net_device *dev, struct udp_tunnel_info *ti)
+{
+	struct udp_tunnel_nic *utn;
+
+	utn = dev->udp_tunnel_nic;
+	if (!utn)
+		return;
+
+	if (!udp_tunnel_nic_is_capable(dev, utn, ti))
+		return;
+
+	udp_tunnel_nic_del_existing(dev, utn, ti);
+
+	udp_tunnel_nic_device_sync(dev, utn);
+}
+
+static void __udp_tunnel_nic_reset_ntf(struct net_device *dev)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	struct udp_tunnel_nic *utn;
+	unsigned int i, j;
+
+	ASSERT_RTNL();
+
+	utn = dev->udp_tunnel_nic;
+	if (!utn)
+		return;
+
+	utn->need_sync = false;
+	for (i = 0; i < utn->n_tables; i++)
+		for (j = 0; j < info->tables[i].n_entries; j++) {
+			struct udp_tunnel_nic_table_entry *entry;
+
+			entry = &utn->entries[i][j];
+
+			entry->flags &= ~(UDP_TUNNEL_NIC_ENTRY_DEL |
+					  UDP_TUNNEL_NIC_ENTRY_OP_FAIL);
+			/* We don't release rtnl across ops */
+			WARN_ON(entry->flags & UDP_TUNNEL_NIC_ENTRY_FROZEN);
+			if (!entry->use_cnt)
+				continue;
+
+			udp_tunnel_nic_entry_queue(utn, entry,
+						   UDP_TUNNEL_NIC_ENTRY_ADD);
+		}
+
+	__udp_tunnel_nic_device_sync(dev, utn);
+}
+
+static size_t
+__udp_tunnel_nic_dump_size(struct net_device *dev, unsigned int table)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	struct udp_tunnel_nic *utn;
+	unsigned int j;
+	size_t size;
+
+	utn = dev->udp_tunnel_nic;
+	if (!utn)
+		return 0;
+
+	size = 0;
+	for (j = 0; j < info->tables[table].n_entries; j++) {
+		if (!udp_tunnel_nic_entry_is_present(&utn->entries[table][j]))
+			continue;
+
+		size += nla_total_size(0) +		 /* _TABLE_ENTRY */
+			nla_total_size(sizeof(__be16)) + /* _ENTRY_PORT */
+			nla_total_size(sizeof(u32));	 /* _ENTRY_TYPE */
+	}
+
+	return size;
+}
+
+static int
+__udp_tunnel_nic_dump_write(struct net_device *dev, unsigned int table,
+			    struct sk_buff *skb)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	struct udp_tunnel_nic *utn;
+	struct nlattr *nest;
+	unsigned int j;
+
+	utn = dev->udp_tunnel_nic;
+	if (!utn)
+		return 0;
+
+	for (j = 0; j < info->tables[table].n_entries; j++) {
+		if (!udp_tunnel_nic_entry_is_present(&utn->entries[table][j]))
+			continue;
+
+		nest = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY);
+
+		if (nla_put_be16(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT,
+				 utn->entries[table][j].port) ||
+		    nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE,
+				ilog2(utn->entries[table][j].type)))
+			goto err_cancel;
+
+		nla_nest_end(skb, nest);
+	}
+
+	return 0;
+
+err_cancel:
+	nla_nest_cancel(skb, nest);
+	return -EMSGSIZE;
+}
+
+static const struct udp_tunnel_nic_ops __udp_tunnel_nic_ops = {
+	.get_port	= __udp_tunnel_nic_get_port,
+	.set_port_priv	= __udp_tunnel_nic_set_port_priv,
+	.add_port	= __udp_tunnel_nic_add_port,
+	.del_port	= __udp_tunnel_nic_del_port,
+	.reset_ntf	= __udp_tunnel_nic_reset_ntf,
+	.dump_size	= __udp_tunnel_nic_dump_size,
+	.dump_write	= __udp_tunnel_nic_dump_write,
+};
+
+static void
+udp_tunnel_nic_flush(struct net_device *dev, struct udp_tunnel_nic *utn)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	unsigned int i, j;
+
+	for (i = 0; i < utn->n_tables; i++)
+		for (j = 0; j < info->tables[i].n_entries; j++) {
+			int adj_cnt = -utn->entries[i][j].use_cnt;
+
+			if (adj_cnt)
+				udp_tunnel_nic_entry_adj(utn, i, j, adj_cnt);
+		}
+
+	__udp_tunnel_nic_device_sync(dev, utn);
+
+	for (i = 0; i < utn->n_tables; i++)
+		memset(utn->entries[i], 0, array_size(info->tables[i].n_entries,
+						      sizeof(**utn->entries)));
+	WARN_ON(utn->need_sync);
+	utn->need_replay = 0;
+}
+
+static void
+udp_tunnel_nic_replay(struct net_device *dev, struct udp_tunnel_nic *utn)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	struct udp_tunnel_nic_shared_node *node;
+	unsigned int i, j;
+
+	/* Freeze all the ports we are already tracking so that the replay
+	 * does not double up the refcount.
+	 */
+	for (i = 0; i < utn->n_tables; i++)
+		for (j = 0; j < info->tables[i].n_entries; j++)
+			udp_tunnel_nic_entry_freeze_used(&utn->entries[i][j]);
+	utn->missed = 0;
+	utn->need_replay = 0;
+
+	if (!info->shared) {
+		udp_tunnel_get_rx_info(dev);
+	} else {
+		list_for_each_entry(node, &info->shared->devices, list)
+			udp_tunnel_get_rx_info(node->dev);
+	}
+
+	for (i = 0; i < utn->n_tables; i++)
+		for (j = 0; j < info->tables[i].n_entries; j++)
+			udp_tunnel_nic_entry_unfreeze(&utn->entries[i][j]);
+}
+
+static void udp_tunnel_nic_device_sync_work(struct work_struct *work)
+{
+	struct udp_tunnel_nic *utn =
+		container_of(work, struct udp_tunnel_nic, work);
+
+	rtnl_lock();
+	utn->work_pending = 0;
+	__udp_tunnel_nic_device_sync(utn->dev, utn);
+
+	if (utn->need_replay)
+		udp_tunnel_nic_replay(utn->dev, utn);
+	rtnl_unlock();
+}
+
+static struct udp_tunnel_nic *
+udp_tunnel_nic_alloc(const struct udp_tunnel_nic_info *info,
+		     unsigned int n_tables)
+{
+	struct udp_tunnel_nic *utn;
+	unsigned int i;
+
+	utn = kzalloc(sizeof(*utn), GFP_KERNEL);
+	if (!utn)
+		return NULL;
+	utn->n_tables = n_tables;
+	INIT_WORK(&utn->work, udp_tunnel_nic_device_sync_work);
+
+	utn->entries = kmalloc_array(n_tables, sizeof(void *), GFP_KERNEL);
+	if (!utn->entries)
+		goto err_free_utn;
+
+	for (i = 0; i < n_tables; i++) {
+		utn->entries[i] = kcalloc(info->tables[i].n_entries,
+					  sizeof(*utn->entries[i]), GFP_KERNEL);
+		if (!utn->entries[i])
+			goto err_free_prev_entries;
+	}
+
+	return utn;
+
+err_free_prev_entries:
+	while (i--)
+		kfree(utn->entries[i]);
+	kfree(utn->entries);
+err_free_utn:
+	kfree(utn);
+	return NULL;
+}
+
+static void udp_tunnel_nic_free(struct udp_tunnel_nic *utn)
+{
+	unsigned int i;
+
+	for (i = 0; i < utn->n_tables; i++)
+		kfree(utn->entries[i]);
+	kfree(utn->entries);
+	kfree(utn);
+}
+
+static int udp_tunnel_nic_register(struct net_device *dev)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	struct udp_tunnel_nic_shared_node *node = NULL;
+	struct udp_tunnel_nic *utn;
+	unsigned int n_tables, i;
+
+	BUILD_BUG_ON(sizeof(utn->missed) * BITS_PER_BYTE <
+		     UDP_TUNNEL_NIC_MAX_TABLES);
+	/* Expect use count of at most 2 (IPv4, IPv6) per device */
+	BUILD_BUG_ON(UDP_TUNNEL_NIC_USE_CNT_MAX <
+		     UDP_TUNNEL_NIC_MAX_SHARING_DEVICES * 2);
+
+	/* Check that the driver info is sane */
+	if (WARN_ON(!info->set_port != !info->unset_port) ||
+	    WARN_ON(!info->set_port == !info->sync_table) ||
+	    WARN_ON(!info->tables[0].n_entries))
+		return -EINVAL;
+
+	if (WARN_ON(info->shared &&
+		    info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY))
+		return -EINVAL;
+
+	n_tables = 1;
+	for (i = 1; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
+		if (!info->tables[i].n_entries)
+			continue;
+
+		n_tables++;
+		if (WARN_ON(!info->tables[i - 1].n_entries))
+			return -EINVAL;
+	}
+
+	/* Create UDP tunnel state structures */
+	if (info->shared) {
+		node = kzalloc(sizeof(*node), GFP_KERNEL);
+		if (!node)
+			return -ENOMEM;
+
+		node->dev = dev;
+	}
+
+	if (info->shared && info->shared->udp_tunnel_nic_info) {
+		utn = info->shared->udp_tunnel_nic_info;
+	} else {
+		utn = udp_tunnel_nic_alloc(info, n_tables);
+		if (!utn) {
+			kfree(node);
+			return -ENOMEM;
+		}
+	}
+
+	if (info->shared) {
+		if (!info->shared->udp_tunnel_nic_info) {
+			INIT_LIST_HEAD(&info->shared->devices);
+			info->shared->udp_tunnel_nic_info = utn;
+		}
+
+		list_add_tail(&node->list, &info->shared->devices);
+	}
+
+	utn->dev = dev;
+	dev_hold(dev);
+	dev->udp_tunnel_nic = utn;
+
+	if (!(info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY))
+		udp_tunnel_get_rx_info(dev);
+
+	return 0;
+}
+
+static void
+udp_tunnel_nic_unregister(struct net_device *dev, struct udp_tunnel_nic *utn)
+{
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+
+	/* For a shared table remove this dev from the list of sharing devices
+	 * and if there are other devices just detach.
+	 */
+	if (info->shared) {
+		struct udp_tunnel_nic_shared_node *node, *first;
+
+		list_for_each_entry(node, &info->shared->devices, list)
+			if (node->dev == dev)
+				break;
+		if (list_entry_is_head(node, &info->shared->devices, list))
+			return;
+
+		list_del(&node->list);
+		kfree(node);
+
+		first = list_first_entry_or_null(&info->shared->devices,
+						 typeof(*first), list);
+		if (first) {
+			udp_tunnel_drop_rx_info(dev);
+			utn->dev = first->dev;
+			goto release_dev;
+		}
+
+		info->shared->udp_tunnel_nic_info = NULL;
+	}
+
+	/* Flush before we check work, so we don't waste time adding entries
+	 * from the work which we will boot immediately.
+	 */
+	udp_tunnel_nic_flush(dev, utn);
+
+	/* Wait for the work to be done using the state, netdev core will
+	 * retry unregister until we give up our reference on this device.
+	 */
+	if (utn->work_pending)
+		return;
+
+	udp_tunnel_nic_free(utn);
+release_dev:
+	dev->udp_tunnel_nic = NULL;
+	dev_put(dev);
+}
+
+static int
+udp_tunnel_nic_netdevice_event(struct notifier_block *unused,
+			       unsigned long event, void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	const struct udp_tunnel_nic_info *info;
+	struct udp_tunnel_nic *utn;
+
+	info = dev->udp_tunnel_nic_info;
+	if (!info)
+		return NOTIFY_DONE;
+
+	if (event == NETDEV_REGISTER) {
+		int err;
+
+		err = udp_tunnel_nic_register(dev);
+		if (err)
+			netdev_WARN(dev, "failed to register for UDP tunnel offloads: %d", err);
+		return notifier_from_errno(err);
+	}
+	/* All other events will need the udp_tunnel_nic state */
+	utn = dev->udp_tunnel_nic;
+	if (!utn)
+		return NOTIFY_DONE;
+
+	if (event == NETDEV_UNREGISTER) {
+		udp_tunnel_nic_unregister(dev, utn);
+		return NOTIFY_OK;
+	}
+
+	/* All other events only matter if NIC has to be programmed open */
+	if (!(info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY))
+		return NOTIFY_DONE;
+
+	if (event == NETDEV_UP) {
+		WARN_ON(!udp_tunnel_nic_is_empty(dev, utn));
+		udp_tunnel_get_rx_info(dev);
+		return NOTIFY_OK;
+	}
+	if (event == NETDEV_GOING_DOWN) {
+		udp_tunnel_nic_flush(dev, utn);
+		return NOTIFY_OK;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block udp_tunnel_nic_notifier_block __read_mostly = {
+	.notifier_call = udp_tunnel_nic_netdevice_event,
+};
+
+static int __init udp_tunnel_nic_init_module(void)
+{
+	int err;
+
+	udp_tunnel_nic_workqueue = alloc_ordered_workqueue("udp_tunnel_nic", 0);
+	if (!udp_tunnel_nic_workqueue)
+		return -ENOMEM;
+
+	rtnl_lock();
+	udp_tunnel_nic_ops = &__udp_tunnel_nic_ops;
+	rtnl_unlock();
+
+	err = register_netdevice_notifier(&udp_tunnel_nic_notifier_block);
+	if (err)
+		goto err_unset_ops;
+
+	return 0;
+
+err_unset_ops:
+	rtnl_lock();
+	udp_tunnel_nic_ops = NULL;
+	rtnl_unlock();
+	destroy_workqueue(udp_tunnel_nic_workqueue);
+	return err;
+}
+late_initcall(udp_tunnel_nic_init_module);
+
+static void __exit udp_tunnel_nic_cleanup_module(void)
+{
+	unregister_netdevice_notifier(&udp_tunnel_nic_notifier_block);
+
+	rtnl_lock();
+	udp_tunnel_nic_ops = NULL;
+	rtnl_unlock();
+
+	destroy_workqueue(udp_tunnel_nic_workqueue);
+}
+module_exit(udp_tunnel_nic_cleanup_module);
+
+MODULE_LICENSE("GPL");
diff --git a/net/ipv4/udp_tunnel_stub.c b/net/ipv4/udp_tunnel_stub.c
new file mode 100644
index 0000000..c4b2888
--- /dev/null
+++ b/net/ipv4/udp_tunnel_stub.c
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2020 Facebook Inc.
+
+#include <net/udp_tunnel.h>
+
+const struct udp_tunnel_nic_ops *udp_tunnel_nic_ops;
+EXPORT_SYMBOL_GPL(udp_tunnel_nic_ops);
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c
index 5936d66..bd8773b 100644
--- a/net/ipv4/udplite.c
+++ b/net/ipv4/udplite.c
@@ -56,10 +56,6 @@
 	.sysctl_mem	   = sysctl_udp_mem,
 	.obj_size	   = sizeof(struct udp_sock),
 	.h.udp_table	   = &udplite_table,
-#ifdef CONFIG_COMPAT
-	.compat_setsockopt = compat_udp_setsockopt,
-	.compat_getsockopt = compat_udp_getsockopt,
-#endif
 };
 EXPORT_SYMBOL(udplite_prot);
 
diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index f8de248..ad2afee 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -18,11 +18,6 @@
 #include <net/ip.h>
 #include <net/xfrm.h>
 
-int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb)
-{
-	return xfrm4_extract_header(skb);
-}
-
 static int xfrm4_rcv_encap_finish2(struct net *net, struct sock *sk,
 				   struct sk_buff *skb)
 {
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index ab343ae..3cff51b 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -14,83 +14,24 @@
 #include <net/xfrm.h>
 #include <net/icmp.h>
 
-static int xfrm4_tunnel_check_size(struct sk_buff *skb)
-{
-	int mtu, ret = 0;
-
-	if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
-		goto out;
-
-	if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df)
-		goto out;
-
-	mtu = dst_mtu(skb_dst(skb));
-	if ((!skb_is_gso(skb) && skb->len > mtu) ||
-	    (skb_is_gso(skb) &&
-	     !skb_gso_validate_network_len(skb, ip_skb_dst_mtu(skb->sk, skb)))) {
-		skb->protocol = htons(ETH_P_IP);
-
-		if (skb->sk)
-			xfrm_local_error(skb, mtu);
-		else
-			icmp_send(skb, ICMP_DEST_UNREACH,
-				  ICMP_FRAG_NEEDED, htonl(mtu));
-		ret = -EMSGSIZE;
-	}
-out:
-	return ret;
-}
-
-int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
-{
-	int err;
-
-	err = xfrm4_tunnel_check_size(skb);
-	if (err)
-		return err;
-
-	XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;
-
-	return xfrm4_extract_header(skb);
-}
-
-int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb)
-{
-	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
-
-	IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
-
-	return xfrm_output(sk, skb);
-}
-
 static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
-	struct xfrm_state *x = skb_dst(skb)->xfrm;
-	const struct xfrm_state_afinfo *afinfo;
-	int ret = -EAFNOSUPPORT;
-
 #ifdef CONFIG_NETFILTER
+	struct xfrm_state *x = skb_dst(skb)->xfrm;
+
 	if (!x) {
 		IPCB(skb)->flags |= IPSKB_REROUTED;
 		return dst_output(net, sk, skb);
 	}
 #endif
 
-	rcu_read_lock();
-	afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode.family);
-	if (likely(afinfo))
-		ret = afinfo->output_finish(sk, skb);
-	else
-		kfree_skb(skb);
-	rcu_read_unlock();
-
-	return ret;
+	return xfrm_output(sk, skb);
 }
 
 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
-			    net, sk, skb, NULL, skb_dst(skb)->dev,
+			    net, sk, skb, skb->dev, skb_dst(skb)->dev,
 			    __xfrm4_output,
 			    !(IPCB(skb)->flags & IPSKB_REROUTED));
 }
diff --git a/net/ipv4/xfrm4_protocol.c b/net/ipv4/xfrm4_protocol.c
index 8a42857..ea595c8 100644
--- a/net/ipv4/xfrm4_protocol.c
+++ b/net/ipv4/xfrm4_protocol.c
@@ -72,6 +72,14 @@
 	if (!head)
 		goto out;
 
+	if (!skb_dst(skb)) {
+		const struct iphdr *iph = ip_hdr(skb);
+
+		if (ip_route_input_noref(skb, iph->daddr, iph->saddr,
+					 iph->tos, skb->dev))
+			goto drop;
+	}
+
 	for_each_protocol_rcu(*head, handler)
 		if ((ret = handler->input_handler(skb, nexthdr, spi, encap_type)) != -EINVAL)
 			return ret;
@@ -79,6 +87,7 @@
 out:
 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
 
+drop:
 	kfree_skb(skb);
 	return 0;
 }
diff --git a/net/ipv4/xfrm4_state.c b/net/ipv4/xfrm4_state.c
index f8ed3c3..87d4db5 100644
--- a/net/ipv4/xfrm4_state.c
+++ b/net/ipv4/xfrm4_state.c
@@ -8,36 +8,12 @@
  *
  */
 
-#include <net/ip.h>
 #include <net/xfrm.h>
-#include <linux/pfkeyv2.h>
-#include <linux/ipsec.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/export.h>
-
-int xfrm4_extract_header(struct sk_buff *skb)
-{
-	const struct iphdr *iph = ip_hdr(skb);
-
-	XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
-	XFRM_MODE_SKB_CB(skb)->id = iph->id;
-	XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
-	XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
-	XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
-	XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
-	memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
-	       sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
-
-	return 0;
-}
 
 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
 	.family			= AF_INET,
 	.proto			= IPPROTO_IPIP,
 	.output			= xfrm4_output,
-	.output_finish		= xfrm4_output_finish,
-	.extract_input		= xfrm4_extract_input,
-	.extract_output		= xfrm4_extract_output,
 	.transport_finish	= xfrm4_transport_finish,
 	.local_error		= xfrm4_local_error,
 };
diff --git a/net/ipv4/xfrm4_tunnel.c b/net/ipv4/xfrm4_tunnel.c
index dc19aff..fb0648e 100644
--- a/net/ipv4/xfrm4_tunnel.c
+++ b/net/ipv4/xfrm4_tunnel.c
@@ -64,14 +64,14 @@
 static struct xfrm_tunnel xfrm_tunnel_handler __read_mostly = {
 	.handler	=	xfrm_tunnel_rcv,
 	.err_handler	=	xfrm_tunnel_err,
-	.priority	=	3,
+	.priority	=	4,
 };
 
 #if IS_ENABLED(CONFIG_IPV6)
 static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly = {
 	.handler	=	xfrm_tunnel_rcv,
 	.err_handler	=	xfrm_tunnel_err,
-	.priority	=	2,
+	.priority	=	3,
 };
 #endif