v4.19.13 snapshot.
diff --git a/include/linux/net.h b/include/linux/net.h
new file mode 100644
index 0000000..e093067
--- /dev/null
+++ b/include/linux/net.h
@@ -0,0 +1,327 @@
+/*
+ * NET An implementation of the SOCKET network access protocol.
+ * This is the master header file for the Linux NET layer,
+ * or, in plain English: the networking handling part of the
+ * kernel.
+ *
+ * Version: @(#)net.h 1.0.3 05/25/93
+ *
+ * Authors: Orest Zborowski, <obz@Kodak.COM>
+ * Ross Biro
+ * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *
+ * 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 _LINUX_NET_H
+#define _LINUX_NET_H
+
+#include <linux/stringify.h>
+#include <linux/random.h>
+#include <linux/wait.h>
+#include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */
+#include <linux/rcupdate.h>
+#include <linux/once.h>
+#include <linux/fs.h>
+
+#include <uapi/linux/net.h>
+
+struct poll_table_struct;
+struct pipe_inode_info;
+struct inode;
+struct file;
+struct net;
+
+/* Historically, SOCKWQ_ASYNC_NOSPACE & SOCKWQ_ASYNC_WAITDATA were located
+ * in sock->flags, but moved into sk->sk_wq->flags to be RCU protected.
+ * Eventually all flags will be in sk->sk_wq->flags.
+ */
+#define SOCKWQ_ASYNC_NOSPACE 0
+#define SOCKWQ_ASYNC_WAITDATA 1
+#define SOCK_NOSPACE 2
+#define SOCK_PASSCRED 3
+#define SOCK_PASSSEC 4
+
+#ifndef ARCH_HAS_SOCKET_TYPES
+/**
+ * enum sock_type - Socket types
+ * @SOCK_STREAM: stream (connection) socket
+ * @SOCK_DGRAM: datagram (conn.less) socket
+ * @SOCK_RAW: raw socket
+ * @SOCK_RDM: reliably-delivered message
+ * @SOCK_SEQPACKET: sequential packet socket
+ * @SOCK_DCCP: Datagram Congestion Control Protocol socket
+ * @SOCK_PACKET: linux specific way of getting packets at the dev level.
+ * For writing rarp and other similar things on the user level.
+ *
+ * When adding some new socket type please
+ * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
+ * overrides this enum for binary compat reasons.
+ */
+enum sock_type {
+ SOCK_STREAM = 1,
+ SOCK_DGRAM = 2,
+ SOCK_RAW = 3,
+ SOCK_RDM = 4,
+ SOCK_SEQPACKET = 5,
+ SOCK_DCCP = 6,
+ SOCK_PACKET = 10,
+};
+
+#define SOCK_MAX (SOCK_PACKET + 1)
+/* Mask which covers at least up to SOCK_MASK-1. The
+ * remaining bits are used as flags. */
+#define SOCK_TYPE_MASK 0xf
+
+/* Flags for socket, socketpair, accept4 */
+#define SOCK_CLOEXEC O_CLOEXEC
+#ifndef SOCK_NONBLOCK
+#define SOCK_NONBLOCK O_NONBLOCK
+#endif
+
+#endif /* ARCH_HAS_SOCKET_TYPES */
+
+enum sock_shutdown_cmd {
+ SHUT_RD,
+ SHUT_WR,
+ SHUT_RDWR,
+};
+
+struct socket_wq {
+ /* Note: wait MUST be first field of socket_wq */
+ wait_queue_head_t wait;
+ struct fasync_struct *fasync_list;
+ unsigned long flags; /* %SOCKWQ_ASYNC_NOSPACE, etc */
+ struct rcu_head rcu;
+} ____cacheline_aligned_in_smp;
+
+/**
+ * struct socket - general BSD socket
+ * @state: socket state (%SS_CONNECTED, etc)
+ * @type: socket type (%SOCK_STREAM, etc)
+ * @flags: socket flags (%SOCK_NOSPACE, etc)
+ * @ops: protocol specific socket operations
+ * @file: File back pointer for gc
+ * @sk: internal networking protocol agnostic socket representation
+ * @wq: wait queue for several uses
+ */
+struct socket {
+ socket_state state;
+
+ short type;
+
+ unsigned long flags;
+
+ struct socket_wq *wq;
+
+ struct file *file;
+ struct sock *sk;
+ const struct proto_ops *ops;
+};
+
+struct vm_area_struct;
+struct page;
+struct sockaddr;
+struct msghdr;
+struct module;
+struct sk_buff;
+typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *,
+ unsigned int, size_t);
+
+struct proto_ops {
+ int family;
+ struct module *owner;
+ int (*release) (struct socket *sock);
+ int (*bind) (struct socket *sock,
+ struct sockaddr *myaddr,
+ int sockaddr_len);
+ int (*connect) (struct socket *sock,
+ struct sockaddr *vaddr,
+ int sockaddr_len, int flags);
+ int (*socketpair)(struct socket *sock1,
+ struct socket *sock2);
+ int (*accept) (struct socket *sock,
+ struct socket *newsock, int flags, bool kern);
+ int (*getname) (struct socket *sock,
+ struct sockaddr *addr,
+ int peer);
+ __poll_t (*poll) (struct file *file, struct socket *sock,
+ struct poll_table_struct *wait);
+ int (*ioctl) (struct socket *sock, unsigned int cmd,
+ unsigned long arg);
+#ifdef CONFIG_COMPAT
+ int (*compat_ioctl) (struct socket *sock, unsigned int cmd,
+ unsigned long arg);
+#endif
+ int (*listen) (struct socket *sock, int len);
+ int (*shutdown) (struct socket *sock, int flags);
+ int (*setsockopt)(struct socket *sock, int level,
+ int optname, char __user *optval, unsigned int optlen);
+ int (*getsockopt)(struct socket *sock, int level,
+ int optname, char __user *optval, int __user *optlen);
+#ifdef CONFIG_COMPAT
+ int (*compat_setsockopt)(struct socket *sock, int level,
+ int optname, char __user *optval, unsigned int optlen);
+ int (*compat_getsockopt)(struct socket *sock, int level,
+ int optname, char __user *optval, int __user *optlen);
+#endif
+ int (*sendmsg) (struct socket *sock, struct msghdr *m,
+ size_t total_len);
+ /* Notes for implementing recvmsg:
+ * ===============================
+ * msg->msg_namelen should get updated by the recvmsg handlers
+ * iff msg_name != NULL. It is by default 0 to prevent
+ * returning uninitialized memory to user space. The recvfrom
+ * handlers can assume that msg.msg_name is either NULL or has
+ * a minimum size of sizeof(struct sockaddr_storage).
+ */
+ int (*recvmsg) (struct socket *sock, struct msghdr *m,
+ size_t total_len, int flags);
+ int (*mmap) (struct file *file, struct socket *sock,
+ struct vm_area_struct * vma);
+ ssize_t (*sendpage) (struct socket *sock, struct page *page,
+ int offset, size_t size, int flags);
+ ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len, unsigned int flags);
+ int (*set_peek_off)(struct sock *sk, int val);
+ int (*peek_len)(struct socket *sock);
+
+ /* The following functions are called internally by kernel with
+ * sock lock already held.
+ */
+ int (*read_sock)(struct sock *sk, read_descriptor_t *desc,
+ sk_read_actor_t recv_actor);
+ int (*sendpage_locked)(struct sock *sk, struct page *page,
+ int offset, size_t size, int flags);
+ int (*sendmsg_locked)(struct sock *sk, struct msghdr *msg,
+ size_t size);
+ int (*set_rcvlowat)(struct sock *sk, int val);
+};
+
+#define DECLARE_SOCKADDR(type, dst, src) \
+ type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
+
+struct net_proto_family {
+ int family;
+ int (*create)(struct net *net, struct socket *sock,
+ int protocol, int kern);
+ struct module *owner;
+};
+
+struct iovec;
+struct kvec;
+
+enum {
+ SOCK_WAKE_IO,
+ SOCK_WAKE_WAITD,
+ SOCK_WAKE_SPACE,
+ SOCK_WAKE_URG,
+};
+
+int sock_wake_async(struct socket_wq *sk_wq, int how, int band);
+int sock_register(const struct net_proto_family *fam);
+void sock_unregister(int family);
+bool sock_is_registered(int family);
+int __sock_create(struct net *net, int family, int type, int proto,
+ struct socket **res, int kern);
+int sock_create(int family, int type, int proto, struct socket **res);
+int sock_create_kern(struct net *net, int family, int type, int proto, struct socket **res);
+int sock_create_lite(int family, int type, int proto, struct socket **res);
+struct socket *sock_alloc(void);
+void sock_release(struct socket *sock);
+int sock_sendmsg(struct socket *sock, struct msghdr *msg);
+int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags);
+struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname);
+struct socket *sockfd_lookup(int fd, int *err);
+struct socket *sock_from_file(struct file *file, int *err);
+#define sockfd_put(sock) fput(sock->file)
+int net_ratelimit(void);
+
+#define net_ratelimited_function(function, ...) \
+do { \
+ if (net_ratelimit()) \
+ function(__VA_ARGS__); \
+} while (0)
+
+#define net_emerg_ratelimited(fmt, ...) \
+ net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__)
+#define net_alert_ratelimited(fmt, ...) \
+ net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__)
+#define net_crit_ratelimited(fmt, ...) \
+ net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__)
+#define net_err_ratelimited(fmt, ...) \
+ net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__)
+#define net_notice_ratelimited(fmt, ...) \
+ net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__)
+#define net_warn_ratelimited(fmt, ...) \
+ net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__)
+#define net_info_ratelimited(fmt, ...) \
+ net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
+#if defined(CONFIG_DYNAMIC_DEBUG)
+#define net_dbg_ratelimited(fmt, ...) \
+do { \
+ DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
+ if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
+ net_ratelimit()) \
+ __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
+ ##__VA_ARGS__); \
+} while (0)
+#elif defined(DEBUG)
+#define net_dbg_ratelimited(fmt, ...) \
+ net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
+#else
+#define net_dbg_ratelimited(fmt, ...) \
+ do { \
+ if (0) \
+ no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
+ } while (0)
+#endif
+
+#define net_get_random_once(buf, nbytes) \
+ get_random_once((buf), (nbytes))
+#define net_get_random_once_wait(buf, nbytes) \
+ get_random_once_wait((buf), (nbytes))
+
+int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
+ size_t num, size_t len);
+int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
+ struct kvec *vec, size_t num, size_t len);
+int kernel_recvmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
+ size_t num, size_t len, int flags);
+
+int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen);
+int kernel_listen(struct socket *sock, int backlog);
+int kernel_accept(struct socket *sock, struct socket **newsock, int flags);
+int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
+ int flags);
+int kernel_getsockname(struct socket *sock, struct sockaddr *addr);
+int kernel_getpeername(struct socket *sock, struct sockaddr *addr);
+int kernel_getsockopt(struct socket *sock, int level, int optname, char *optval,
+ int *optlen);
+int kernel_setsockopt(struct socket *sock, int level, int optname, char *optval,
+ unsigned int optlen);
+int kernel_sendpage(struct socket *sock, struct page *page, int offset,
+ size_t size, int flags);
+int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
+ size_t size, int flags);
+int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how);
+
+/* Routine returns the IP overhead imposed by a (caller-protected) socket. */
+u32 kernel_sock_ip_overhead(struct sock *sk);
+
+#define MODULE_ALIAS_NETPROTO(proto) \
+ MODULE_ALIAS("net-pf-" __stringify(proto))
+
+#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
+ MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
+
+#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
+ MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
+ "-type-" __stringify(type))
+
+#define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
+ MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
+ name)
+#endif /* _LINUX_NET_H */