345 строки
12 KiB
C
345 строки
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* NET An implementation of the SOCKET network access protocol.
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* This is the master header file for the Linux NET layer,
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* or, in plain English: the networking handling part of the
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* kernel.
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*
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* Version: @(#)net.h 1.0.3 05/25/93
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*
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* Authors: Orest Zborowski, <obz@Kodak.COM>
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* Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*/
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#ifndef _LINUX_NET_H
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#define _LINUX_NET_H
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#include <linux/stringify.h>
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#include <linux/random.h>
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#include <linux/wait.h>
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#include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */
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#include <linux/rcupdate.h>
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#include <linux/once.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/sockptr.h>
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#include <uapi/linux/net.h>
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struct poll_table_struct;
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struct pipe_inode_info;
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struct inode;
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struct file;
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struct net;
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/* Historically, SOCKWQ_ASYNC_NOSPACE & SOCKWQ_ASYNC_WAITDATA were located
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* in sock->flags, but moved into sk->sk_wq->flags to be RCU protected.
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* Eventually all flags will be in sk->sk_wq->flags.
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*/
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#define SOCKWQ_ASYNC_NOSPACE 0
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#define SOCKWQ_ASYNC_WAITDATA 1
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#define SOCK_NOSPACE 2
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#define SOCK_PASSCRED 3
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#define SOCK_PASSSEC 4
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#define PROTO_CMSG_DATA_ONLY 0x0001
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#ifndef ARCH_HAS_SOCKET_TYPES
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/**
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* enum sock_type - Socket types
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* @SOCK_STREAM: stream (connection) socket
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* @SOCK_DGRAM: datagram (conn.less) socket
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* @SOCK_RAW: raw socket
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* @SOCK_RDM: reliably-delivered message
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* @SOCK_SEQPACKET: sequential packet socket
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* @SOCK_DCCP: Datagram Congestion Control Protocol socket
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* @SOCK_PACKET: linux specific way of getting packets at the dev level.
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* For writing rarp and other similar things on the user level.
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*
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* When adding some new socket type please
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* grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
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* overrides this enum for binary compat reasons.
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*/
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enum sock_type {
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SOCK_STREAM = 1,
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SOCK_DGRAM = 2,
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SOCK_RAW = 3,
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SOCK_RDM = 4,
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SOCK_SEQPACKET = 5,
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SOCK_DCCP = 6,
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SOCK_PACKET = 10,
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};
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#define SOCK_MAX (SOCK_PACKET + 1)
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/* Mask which covers at least up to SOCK_MASK-1. The
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* remaining bits are used as flags. */
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#define SOCK_TYPE_MASK 0xf
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/* Flags for socket, socketpair, accept4 */
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#define SOCK_CLOEXEC O_CLOEXEC
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#ifndef SOCK_NONBLOCK
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#define SOCK_NONBLOCK O_NONBLOCK
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#endif
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#endif /* ARCH_HAS_SOCKET_TYPES */
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/**
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* enum sock_shutdown_cmd - Shutdown types
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* @SHUT_RD: shutdown receptions
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* @SHUT_WR: shutdown transmissions
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* @SHUT_RDWR: shutdown receptions/transmissions
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*/
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enum sock_shutdown_cmd {
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SHUT_RD,
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SHUT_WR,
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SHUT_RDWR,
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};
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struct socket_wq {
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/* Note: wait MUST be first field of socket_wq */
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wait_queue_head_t wait;
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struct fasync_struct *fasync_list;
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unsigned long flags; /* %SOCKWQ_ASYNC_NOSPACE, etc */
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struct rcu_head rcu;
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} ____cacheline_aligned_in_smp;
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/**
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* struct socket - general BSD socket
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* @state: socket state (%SS_CONNECTED, etc)
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* @type: socket type (%SOCK_STREAM, etc)
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* @flags: socket flags (%SOCK_NOSPACE, etc)
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* @ops: protocol specific socket operations
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* @file: File back pointer for gc
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* @sk: internal networking protocol agnostic socket representation
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* @wq: wait queue for several uses
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*/
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struct socket {
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socket_state state;
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short type;
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unsigned long flags;
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struct file *file;
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struct sock *sk;
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const struct proto_ops *ops;
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struct socket_wq wq;
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};
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struct vm_area_struct;
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struct page;
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struct sockaddr;
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struct msghdr;
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struct module;
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struct sk_buff;
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typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *,
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unsigned int, size_t);
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struct proto_ops {
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int family;
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unsigned int flags;
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struct module *owner;
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int (*release) (struct socket *sock);
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int (*bind) (struct socket *sock,
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struct sockaddr *myaddr,
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int sockaddr_len);
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int (*connect) (struct socket *sock,
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struct sockaddr *vaddr,
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int sockaddr_len, int flags);
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int (*socketpair)(struct socket *sock1,
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struct socket *sock2);
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int (*accept) (struct socket *sock,
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struct socket *newsock, int flags, bool kern);
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int (*getname) (struct socket *sock,
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struct sockaddr *addr,
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int peer);
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__poll_t (*poll) (struct file *file, struct socket *sock,
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struct poll_table_struct *wait);
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int (*ioctl) (struct socket *sock, unsigned int cmd,
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unsigned long arg);
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#ifdef CONFIG_COMPAT
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int (*compat_ioctl) (struct socket *sock, unsigned int cmd,
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unsigned long arg);
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#endif
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int (*gettstamp) (struct socket *sock, void __user *userstamp,
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bool timeval, bool time32);
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int (*listen) (struct socket *sock, int len);
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int (*shutdown) (struct socket *sock, int flags);
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int (*setsockopt)(struct socket *sock, int level,
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int optname, sockptr_t optval,
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unsigned int optlen);
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int (*getsockopt)(struct socket *sock, int level,
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int optname, char __user *optval, int __user *optlen);
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void (*show_fdinfo)(struct seq_file *m, struct socket *sock);
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int (*sendmsg) (struct socket *sock, struct msghdr *m,
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size_t total_len);
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/* Notes for implementing recvmsg:
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* ===============================
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* msg->msg_namelen should get updated by the recvmsg handlers
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* iff msg_name != NULL. It is by default 0 to prevent
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* returning uninitialized memory to user space. The recvfrom
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* handlers can assume that msg.msg_name is either NULL or has
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* a minimum size of sizeof(struct sockaddr_storage).
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*/
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int (*recvmsg) (struct socket *sock, struct msghdr *m,
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size_t total_len, int flags);
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int (*mmap) (struct file *file, struct socket *sock,
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struct vm_area_struct * vma);
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ssize_t (*sendpage) (struct socket *sock, struct page *page,
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int offset, size_t size, int flags);
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ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
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struct pipe_inode_info *pipe, size_t len, unsigned int flags);
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int (*set_peek_off)(struct sock *sk, int val);
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int (*peek_len)(struct socket *sock);
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/* The following functions are called internally by kernel with
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* sock lock already held.
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*/
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int (*read_sock)(struct sock *sk, read_descriptor_t *desc,
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sk_read_actor_t recv_actor);
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int (*sendpage_locked)(struct sock *sk, struct page *page,
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int offset, size_t size, int flags);
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int (*sendmsg_locked)(struct sock *sk, struct msghdr *msg,
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size_t size);
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int (*set_rcvlowat)(struct sock *sk, int val);
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};
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#define DECLARE_SOCKADDR(type, dst, src) \
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type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
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struct net_proto_family {
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int family;
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int (*create)(struct net *net, struct socket *sock,
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int protocol, int kern);
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struct module *owner;
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};
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struct iovec;
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struct kvec;
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enum {
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SOCK_WAKE_IO,
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SOCK_WAKE_WAITD,
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SOCK_WAKE_SPACE,
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SOCK_WAKE_URG,
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};
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int sock_wake_async(struct socket_wq *sk_wq, int how, int band);
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int sock_register(const struct net_proto_family *fam);
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void sock_unregister(int family);
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bool sock_is_registered(int family);
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int __sock_create(struct net *net, int family, int type, int proto,
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struct socket **res, int kern);
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int sock_create(int family, int type, int proto, struct socket **res);
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int sock_create_kern(struct net *net, int family, int type, int proto, struct socket **res);
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int sock_create_lite(int family, int type, int proto, struct socket **res);
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struct socket *sock_alloc(void);
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void sock_release(struct socket *sock);
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int sock_sendmsg(struct socket *sock, struct msghdr *msg);
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int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags);
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struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname);
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struct socket *sockfd_lookup(int fd, int *err);
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struct socket *sock_from_file(struct file *file);
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#define sockfd_put(sock) fput(sock->file)
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int net_ratelimit(void);
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#define net_ratelimited_function(function, ...) \
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do { \
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if (net_ratelimit()) \
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function(__VA_ARGS__); \
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} while (0)
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#define net_emerg_ratelimited(fmt, ...) \
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net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__)
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#define net_alert_ratelimited(fmt, ...) \
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net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__)
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#define net_crit_ratelimited(fmt, ...) \
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net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__)
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#define net_err_ratelimited(fmt, ...) \
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net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__)
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#define net_notice_ratelimited(fmt, ...) \
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net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__)
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#define net_warn_ratelimited(fmt, ...) \
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net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__)
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#define net_info_ratelimited(fmt, ...) \
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net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
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#if defined(CONFIG_DYNAMIC_DEBUG) || \
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(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
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#define net_dbg_ratelimited(fmt, ...) \
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do { \
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
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if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
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net_ratelimit()) \
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__dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
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##__VA_ARGS__); \
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} while (0)
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#elif defined(DEBUG)
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#define net_dbg_ratelimited(fmt, ...) \
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net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
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#else
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#define net_dbg_ratelimited(fmt, ...) \
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do { \
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if (0) \
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
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} while (0)
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#endif
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#define net_get_random_once(buf, nbytes) \
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get_random_once((buf), (nbytes))
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#define net_get_random_once_wait(buf, nbytes) \
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get_random_once_wait((buf), (nbytes))
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/*
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* E.g. XFS meta- & log-data is in slab pages, or bcache meta
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* data pages, or other high order pages allocated by
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* __get_free_pages() without __GFP_COMP, which have a page_count
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* of 0 and/or have PageSlab() set. We cannot use send_page for
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* those, as that does get_page(); put_page(); and would cause
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* either a VM_BUG directly, or __page_cache_release a page that
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* would actually still be referenced by someone, leading to some
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* obscure delayed Oops somewhere else.
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*/
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static inline bool sendpage_ok(struct page *page)
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{
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return !PageSlab(page) && page_count(page) >= 1;
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}
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int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
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size_t num, size_t len);
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int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
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struct kvec *vec, size_t num, size_t len);
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int kernel_recvmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
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size_t num, size_t len, int flags);
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int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen);
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int kernel_listen(struct socket *sock, int backlog);
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int kernel_accept(struct socket *sock, struct socket **newsock, int flags);
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int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
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int flags);
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int kernel_getsockname(struct socket *sock, struct sockaddr *addr);
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int kernel_getpeername(struct socket *sock, struct sockaddr *addr);
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int kernel_sendpage(struct socket *sock, struct page *page, int offset,
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size_t size, int flags);
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int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
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size_t size, int flags);
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int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how);
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/* Routine returns the IP overhead imposed by a (caller-protected) socket. */
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u32 kernel_sock_ip_overhead(struct sock *sk);
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#define MODULE_ALIAS_NETPROTO(proto) \
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MODULE_ALIAS("net-pf-" __stringify(proto))
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#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
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MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
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#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
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MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
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"-type-" __stringify(type))
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#define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
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MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
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name)
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#endif /* _LINUX_NET_H */
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