v4.19.13 snapshot.
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
new file mode 100644
index 0000000..371b3b4
--- /dev/null
+++ b/include/net/inet_connection_sock.h
@@ -0,0 +1,317 @@
+/*
+ * NET Generic infrastructure for INET connection oriented protocols.
+ *
+ * Definitions for inet_connection_sock
+ *
+ * Authors: Many people, see the TCP sources
+ *
+ * From code originally in TCP
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef _INET_CONNECTION_SOCK_H
+#define _INET_CONNECTION_SOCK_H
+
+#include <linux/compiler.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/poll.h>
+#include <linux/kernel.h>
+
+#include <net/inet_sock.h>
+#include <net/request_sock.h>
+
+/* Cancel timers, when they are not required. */
+#undef INET_CSK_CLEAR_TIMERS
+
+struct inet_bind_bucket;
+struct tcp_congestion_ops;
+
+/*
+ * Pointers to address related TCP functions
+ * (i.e. things that depend on the address family)
+ */
+struct inet_connection_sock_af_ops {
+ int (*queue_xmit)(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
+ void (*send_check)(struct sock *sk, struct sk_buff *skb);
+ int (*rebuild_header)(struct sock *sk);
+ void (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb);
+ int (*conn_request)(struct sock *sk, struct sk_buff *skb);
+ struct sock *(*syn_recv_sock)(const struct sock *sk, struct sk_buff *skb,
+ struct request_sock *req,
+ struct dst_entry *dst,
+ struct request_sock *req_unhash,
+ bool *own_req);
+ u16 net_header_len;
+ u16 net_frag_header_len;
+ u16 sockaddr_len;
+ int (*setsockopt)(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen);
+ int (*getsockopt)(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen);
+#ifdef CONFIG_COMPAT
+ int (*compat_setsockopt)(struct sock *sk,
+ int level, int optname,
+ char __user *optval, unsigned int optlen);
+ int (*compat_getsockopt)(struct sock *sk,
+ int level, int optname,
+ char __user *optval, int __user *optlen);
+#endif
+ void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
+ void (*mtu_reduced)(struct sock *sk);
+};
+
+/** inet_connection_sock - INET connection oriented sock
+ *
+ * @icsk_accept_queue: FIFO of established children
+ * @icsk_bind_hash: Bind node
+ * @icsk_timeout: Timeout
+ * @icsk_retransmit_timer: Resend (no ack)
+ * @icsk_rto: Retransmit timeout
+ * @icsk_pmtu_cookie Last pmtu seen by socket
+ * @icsk_ca_ops Pluggable congestion control hook
+ * @icsk_af_ops Operations which are AF_INET{4,6} specific
+ * @icsk_ulp_ops Pluggable ULP control hook
+ * @icsk_ulp_data ULP private data
+ * @icsk_clean_acked Clean acked data hook
+ * @icsk_listen_portaddr_node hash to the portaddr listener hashtable
+ * @icsk_ca_state: Congestion control state
+ * @icsk_retransmits: Number of unrecovered [RTO] timeouts
+ * @icsk_pending: Scheduled timer event
+ * @icsk_backoff: Backoff
+ * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
+ * @icsk_probes_out: unanswered 0 window probes
+ * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
+ * @icsk_ack: Delayed ACK control data
+ * @icsk_mtup; MTU probing control data
+ */
+struct inet_connection_sock {
+ /* inet_sock has to be the first member! */
+ struct inet_sock icsk_inet;
+ struct request_sock_queue icsk_accept_queue;
+ struct inet_bind_bucket *icsk_bind_hash;
+ unsigned long icsk_timeout;
+ struct timer_list icsk_retransmit_timer;
+ struct timer_list icsk_delack_timer;
+ __u32 icsk_rto;
+ __u32 icsk_pmtu_cookie;
+ const struct tcp_congestion_ops *icsk_ca_ops;
+ const struct inet_connection_sock_af_ops *icsk_af_ops;
+ const struct tcp_ulp_ops *icsk_ulp_ops;
+ void *icsk_ulp_data;
+ void (*icsk_clean_acked)(struct sock *sk, u32 acked_seq);
+ struct hlist_node icsk_listen_portaddr_node;
+ unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
+ __u8 icsk_ca_state:6,
+ icsk_ca_setsockopt:1,
+ icsk_ca_dst_locked:1;
+ __u8 icsk_retransmits;
+ __u8 icsk_pending;
+ __u8 icsk_backoff;
+ __u8 icsk_syn_retries;
+ __u8 icsk_probes_out;
+ __u16 icsk_ext_hdr_len;
+ struct {
+ __u8 pending; /* ACK is pending */
+ __u8 quick; /* Scheduled number of quick acks */
+ __u8 pingpong; /* The session is interactive */
+ __u8 blocked; /* Delayed ACK was blocked by socket lock */
+ __u32 ato; /* Predicted tick of soft clock */
+ unsigned long timeout; /* Currently scheduled timeout */
+ __u32 lrcvtime; /* timestamp of last received data packet */
+ __u16 last_seg_size; /* Size of last incoming segment */
+ __u16 rcv_mss; /* MSS used for delayed ACK decisions */
+ } icsk_ack;
+ struct {
+ int enabled;
+
+ /* Range of MTUs to search */
+ int search_high;
+ int search_low;
+
+ /* Information on the current probe. */
+ int probe_size;
+
+ u32 probe_timestamp;
+ } icsk_mtup;
+ u32 icsk_user_timeout;
+
+ u64 icsk_ca_priv[88 / sizeof(u64)];
+#define ICSK_CA_PRIV_SIZE (11 * sizeof(u64))
+};
+
+#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
+#define ICSK_TIME_DACK 2 /* Delayed ack timer */
+#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
+#define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */
+#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
+#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
+
+static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
+{
+ return (struct inet_connection_sock *)sk;
+}
+
+static inline void *inet_csk_ca(const struct sock *sk)
+{
+ return (void *)inet_csk(sk)->icsk_ca_priv;
+}
+
+struct sock *inet_csk_clone_lock(const struct sock *sk,
+ const struct request_sock *req,
+ const gfp_t priority);
+
+enum inet_csk_ack_state_t {
+ ICSK_ACK_SCHED = 1,
+ ICSK_ACK_TIMER = 2,
+ ICSK_ACK_PUSHED = 4,
+ ICSK_ACK_PUSHED2 = 8,
+ ICSK_ACK_NOW = 16 /* Send the next ACK immediately (once) */
+};
+
+void inet_csk_init_xmit_timers(struct sock *sk,
+ void (*retransmit_handler)(struct timer_list *),
+ void (*delack_handler)(struct timer_list *),
+ void (*keepalive_handler)(struct timer_list *));
+void inet_csk_clear_xmit_timers(struct sock *sk);
+
+static inline void inet_csk_schedule_ack(struct sock *sk)
+{
+ inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
+}
+
+static inline int inet_csk_ack_scheduled(const struct sock *sk)
+{
+ return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
+}
+
+static inline void inet_csk_delack_init(struct sock *sk)
+{
+ memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
+}
+
+void inet_csk_delete_keepalive_timer(struct sock *sk);
+void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
+
+static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
+{
+ struct inet_connection_sock *icsk = inet_csk(sk);
+
+ if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
+ icsk->icsk_pending = 0;
+#ifdef INET_CSK_CLEAR_TIMERS
+ sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
+#endif
+ } else if (what == ICSK_TIME_DACK) {
+ icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
+#ifdef INET_CSK_CLEAR_TIMERS
+ sk_stop_timer(sk, &icsk->icsk_delack_timer);
+#endif
+ } else {
+ pr_debug("inet_csk BUG: unknown timer value\n");
+ }
+}
+
+/*
+ * Reset the retransmission timer
+ */
+static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
+ unsigned long when,
+ const unsigned long max_when)
+{
+ struct inet_connection_sock *icsk = inet_csk(sk);
+
+ if (when > max_when) {
+ pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
+ sk, what, when, (void *)_THIS_IP_);
+ when = max_when;
+ }
+
+ if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
+ what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE ||
+ what == ICSK_TIME_REO_TIMEOUT) {
+ icsk->icsk_pending = what;
+ icsk->icsk_timeout = jiffies + when;
+ sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
+ } else if (what == ICSK_TIME_DACK) {
+ icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
+ icsk->icsk_ack.timeout = jiffies + when;
+ sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
+ } else {
+ pr_debug("inet_csk BUG: unknown timer value\n");
+ }
+}
+
+static inline unsigned long
+inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
+ unsigned long max_when)
+{
+ u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
+
+ return (unsigned long)min_t(u64, when, max_when);
+}
+
+struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern);
+
+int inet_csk_get_port(struct sock *sk, unsigned short snum);
+
+struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,
+ const struct request_sock *req);
+struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
+ struct sock *newsk,
+ const struct request_sock *req);
+
+struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
+ struct request_sock *req,
+ struct sock *child);
+void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
+ unsigned long timeout);
+struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
+ struct request_sock *req,
+ bool own_req);
+
+static inline void inet_csk_reqsk_queue_added(struct sock *sk)
+{
+ reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
+}
+
+static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
+{
+ return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
+}
+
+static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
+{
+ return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
+}
+
+void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
+void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);
+
+void inet_csk_destroy_sock(struct sock *sk);
+void inet_csk_prepare_forced_close(struct sock *sk);
+
+/*
+ * LISTEN is a special case for poll..
+ */
+static inline __poll_t inet_csk_listen_poll(const struct sock *sk)
+{
+ return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
+ (EPOLLIN | EPOLLRDNORM) : 0;
+}
+
+int inet_csk_listen_start(struct sock *sk, int backlog);
+void inet_csk_listen_stop(struct sock *sk);
+
+void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
+
+int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen);
+int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen);
+
+struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
+#endif /* _INET_CONNECTION_SOCK_H */