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linux
1/*
2 * NET An implementation of the SOCKET network access protocol.
3 * This is the master header file for the Linux NET layer,
4 * or, in plain English: the networking handling part of the
5 * kernel.
6 *
7 * Version: @(#)net.h 1.0.3 05/25/93
8 *
9 * Authors: Orest Zborowski, <obz@Kodak.COM>
10 * Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 */
18#ifndef _LINUX_NET_H
19#define _LINUX_NET_H
20
21#include <linux/socket.h>
22#include <asm/socket.h>
23
24#define NPROTO AF_MAX
25
26#define SYS_SOCKET 1 /* sys_socket(2) */
27#define SYS_BIND 2 /* sys_bind(2) */
28#define SYS_CONNECT 3 /* sys_connect(2) */
29#define SYS_LISTEN 4 /* sys_listen(2) */
30#define SYS_ACCEPT 5 /* sys_accept(2) */
31#define SYS_GETSOCKNAME 6 /* sys_getsockname(2) */
32#define SYS_GETPEERNAME 7 /* sys_getpeername(2) */
33#define SYS_SOCKETPAIR 8 /* sys_socketpair(2) */
34#define SYS_SEND 9 /* sys_send(2) */
35#define SYS_RECV 10 /* sys_recv(2) */
36#define SYS_SENDTO 11 /* sys_sendto(2) */
37#define SYS_RECVFROM 12 /* sys_recvfrom(2) */
38#define SYS_SHUTDOWN 13 /* sys_shutdown(2) */
39#define SYS_SETSOCKOPT 14 /* sys_setsockopt(2) */
40#define SYS_GETSOCKOPT 15 /* sys_getsockopt(2) */
41#define SYS_SENDMSG 16 /* sys_sendmsg(2) */
42#define SYS_RECVMSG 17 /* sys_recvmsg(2) */
43#define SYS_ACCEPT4 18 /* sys_accept4(2) */
44#define SYS_RECVMMSG 19 /* sys_recvmmsg(2) */
45#define SYS_SENDMMSG 20 /* sys_sendmmsg(2) */
46
47typedef enum {
48 SS_FREE = 0, /* not allocated */
49 SS_UNCONNECTED, /* unconnected to any socket */
50 SS_CONNECTING, /* in process of connecting */
51 SS_CONNECTED, /* connected to socket */
52 SS_DISCONNECTING /* in process of disconnecting */
53} socket_state;
54
55#define __SO_ACCEPTCON (1 << 16) /* performed a listen */
56
57#ifdef __KERNEL__
58#include <linux/stringify.h>
59#include <linux/random.h>
60#include <linux/wait.h>
61#include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */
62#include <linux/kmemcheck.h>
63#include <linux/rcupdate.h>
64
65struct poll_table_struct;
66struct pipe_inode_info;
67struct inode;
68struct net;
69
70#define SOCK_ASYNC_NOSPACE 0
71#define SOCK_ASYNC_WAITDATA 1
72#define SOCK_NOSPACE 2
73#define SOCK_PASSCRED 3
74#define SOCK_PASSSEC 4
75
76#ifndef ARCH_HAS_SOCKET_TYPES
77/**
78 * enum sock_type - Socket types
79 * @SOCK_STREAM: stream (connection) socket
80 * @SOCK_DGRAM: datagram (conn.less) socket
81 * @SOCK_RAW: raw socket
82 * @SOCK_RDM: reliably-delivered message
83 * @SOCK_SEQPACKET: sequential packet socket
84 * @SOCK_DCCP: Datagram Congestion Control Protocol socket
85 * @SOCK_PACKET: linux specific way of getting packets at the dev level.
86 * For writing rarp and other similar things on the user level.
87 *
88 * When adding some new socket type please
89 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
90 * overrides this enum for binary compat reasons.
91 */
92enum sock_type {
93 SOCK_STREAM = 1,
94 SOCK_DGRAM = 2,
95 SOCK_RAW = 3,
96 SOCK_RDM = 4,
97 SOCK_SEQPACKET = 5,
98 SOCK_DCCP = 6,
99 SOCK_PACKET = 10,
100};
101
102#define SOCK_MAX (SOCK_PACKET + 1)
103/* Mask which covers at least up to SOCK_MASK-1. The
104 * remaining bits are used as flags. */
105#define SOCK_TYPE_MASK 0xf
106
107/* Flags for socket, socketpair, accept4 */
108#define SOCK_CLOEXEC O_CLOEXEC
109#ifndef SOCK_NONBLOCK
110#define SOCK_NONBLOCK O_NONBLOCK
111#endif
112
113#endif /* ARCH_HAS_SOCKET_TYPES */
114
115enum sock_shutdown_cmd {
116 SHUT_RD = 0,
117 SHUT_WR = 1,
118 SHUT_RDWR = 2,
119};
120
121struct socket_wq {
122 /* Note: wait MUST be first field of socket_wq */
123 wait_queue_head_t wait;
124 struct fasync_struct *fasync_list;
125 struct rcu_head rcu;
126} ____cacheline_aligned_in_smp;
127
128/**
129 * struct socket - general BSD socket
130 * @state: socket state (%SS_CONNECTED, etc)
131 * @type: socket type (%SOCK_STREAM, etc)
132 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
133 * @ops: protocol specific socket operations
134 * @file: File back pointer for gc
135 * @sk: internal networking protocol agnostic socket representation
136 * @wq: wait queue for several uses
137 */
138struct socket {
139 socket_state state;
140
141 kmemcheck_bitfield_begin(type);
142 short type;
143 kmemcheck_bitfield_end(type);
144
145 unsigned long flags;
146
147 struct socket_wq __rcu *wq;
148
149 struct file *file;
150 struct sock *sk;
151 const struct proto_ops *ops;
152};
153
154struct vm_area_struct;
155struct page;
156struct kiocb;
157struct sockaddr;
158struct msghdr;
159struct module;
160
161struct proto_ops {
162 int family;
163 struct module *owner;
164 int (*release) (struct socket *sock);
165 int (*bind) (struct socket *sock,
166 struct sockaddr *myaddr,
167 int sockaddr_len);
168 int (*connect) (struct socket *sock,
169 struct sockaddr *vaddr,
170 int sockaddr_len, int flags);
171 int (*socketpair)(struct socket *sock1,
172 struct socket *sock2);
173 int (*accept) (struct socket *sock,
174 struct socket *newsock, int flags);
175 int (*getname) (struct socket *sock,
176 struct sockaddr *addr,
177 int *sockaddr_len, int peer);
178 unsigned int (*poll) (struct file *file, struct socket *sock,
179 struct poll_table_struct *wait);
180 int (*ioctl) (struct socket *sock, unsigned int cmd,
181 unsigned long arg);
182#ifdef CONFIG_COMPAT
183 int (*compat_ioctl) (struct socket *sock, unsigned int cmd,
184 unsigned long arg);
185#endif
186 int (*listen) (struct socket *sock, int len);
187 int (*shutdown) (struct socket *sock, int flags);
188 int (*setsockopt)(struct socket *sock, int level,
189 int optname, char __user *optval, unsigned int optlen);
190 int (*getsockopt)(struct socket *sock, int level,
191 int optname, char __user *optval, int __user *optlen);
192#ifdef CONFIG_COMPAT
193 int (*compat_setsockopt)(struct socket *sock, int level,
194 int optname, char __user *optval, unsigned int optlen);
195 int (*compat_getsockopt)(struct socket *sock, int level,
196 int optname, char __user *optval, int __user *optlen);
197#endif
198 int (*sendmsg) (struct kiocb *iocb, struct socket *sock,
199 struct msghdr *m, size_t total_len);
200 int (*recvmsg) (struct kiocb *iocb, struct socket *sock,
201 struct msghdr *m, size_t total_len,
202 int flags);
203 int (*mmap) (struct file *file, struct socket *sock,
204 struct vm_area_struct * vma);
205 ssize_t (*sendpage) (struct socket *sock, struct page *page,
206 int offset, size_t size, int flags);
207 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
208 struct pipe_inode_info *pipe, size_t len, unsigned int flags);
209};
210
211#define DECLARE_SOCKADDR(type, dst, src) \
212 type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
213
214struct net_proto_family {
215 int family;
216 int (*create)(struct net *net, struct socket *sock,
217 int protocol, int kern);
218 struct module *owner;
219};
220
221struct iovec;
222struct kvec;
223
224enum {
225 SOCK_WAKE_IO,
226 SOCK_WAKE_WAITD,
227 SOCK_WAKE_SPACE,
228 SOCK_WAKE_URG,
229};
230
231extern int sock_wake_async(struct socket *sk, int how, int band);
232extern int sock_register(const struct net_proto_family *fam);
233extern void sock_unregister(int family);
234extern int __sock_create(struct net *net, int family, int type, int proto,
235 struct socket **res, int kern);
236extern int sock_create(int family, int type, int proto,
237 struct socket **res);
238extern int sock_create_kern(int family, int type, int proto,
239 struct socket **res);
240extern int sock_create_lite(int family, int type, int proto,
241 struct socket **res);
242extern void sock_release(struct socket *sock);
243extern int sock_sendmsg(struct socket *sock, struct msghdr *msg,
244 size_t len);
245extern int sock_recvmsg(struct socket *sock, struct msghdr *msg,
246 size_t size, int flags);
247extern int sock_map_fd(struct socket *sock, int flags);
248extern struct socket *sockfd_lookup(int fd, int *err);
249#define sockfd_put(sock) fput(sock->file)
250extern int net_ratelimit(void);
251
252#define net_random() random32()
253#define net_srandom(seed) srandom32((__force u32)seed)
254
255extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
256 struct kvec *vec, size_t num, size_t len);
257extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
258 struct kvec *vec, size_t num,
259 size_t len, int flags);
260
261extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
262 int addrlen);
263extern int kernel_listen(struct socket *sock, int backlog);
264extern int kernel_accept(struct socket *sock, struct socket **newsock,
265 int flags);
266extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
267 int addrlen, int flags);
268extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
269 int *addrlen);
270extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
271 int *addrlen);
272extern int kernel_getsockopt(struct socket *sock, int level, int optname,
273 char *optval, int *optlen);
274extern int kernel_setsockopt(struct socket *sock, int level, int optname,
275 char *optval, unsigned int optlen);
276extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
277 size_t size, int flags);
278extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
279extern int kernel_sock_shutdown(struct socket *sock,
280 enum sock_shutdown_cmd how);
281
282#define MODULE_ALIAS_NETPROTO(proto) \
283 MODULE_ALIAS("net-pf-" __stringify(proto))
284
285#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
286 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
287
288#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
289 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
290 "-type-" __stringify(type))
291
292#endif /* __KERNEL__ */
293#endif /* _LINUX_NET_H */