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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
46typedef enum {
47 SS_FREE = 0, /* not allocated */
48 SS_UNCONNECTED, /* unconnected to any socket */
49 SS_CONNECTING, /* in process of connecting */
50 SS_CONNECTED, /* connected to socket */
51 SS_DISCONNECTING /* in process of disconnecting */
52} socket_state;
53
54#define __SO_ACCEPTCON (1 << 16) /* performed a listen */
55
56#ifdef __KERNEL__
57#include <linux/stringify.h>
58#include <linux/random.h>
59#include <linux/wait.h>
60#include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */
61#include <linux/kmemcheck.h>
62#include <linux/rcupdate.h>
63
64struct poll_table_struct;
65struct pipe_inode_info;
66struct inode;
67struct net;
68
69#define SOCK_ASYNC_NOSPACE 0
70#define SOCK_ASYNC_WAITDATA 1
71#define SOCK_NOSPACE 2
72#define SOCK_PASSCRED 3
73#define SOCK_PASSSEC 4
74
75#ifndef ARCH_HAS_SOCKET_TYPES
76/**
77 * enum sock_type - Socket types
78 * @SOCK_STREAM: stream (connection) socket
79 * @SOCK_DGRAM: datagram (conn.less) socket
80 * @SOCK_RAW: raw socket
81 * @SOCK_RDM: reliably-delivered message
82 * @SOCK_SEQPACKET: sequential packet socket
83 * @SOCK_DCCP: Datagram Congestion Control Protocol socket
84 * @SOCK_PACKET: linux specific way of getting packets at the dev level.
85 * For writing rarp and other similar things on the user level.
86 *
87 * When adding some new socket type please
88 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
89 * overrides this enum for binary compat reasons.
90 */
91enum sock_type {
92 SOCK_STREAM = 1,
93 SOCK_DGRAM = 2,
94 SOCK_RAW = 3,
95 SOCK_RDM = 4,
96 SOCK_SEQPACKET = 5,
97 SOCK_DCCP = 6,
98 SOCK_PACKET = 10,
99};
100
101#define SOCK_MAX (SOCK_PACKET + 1)
102/* Mask which covers at least up to SOCK_MASK-1. The
103 * remaining bits are used as flags. */
104#define SOCK_TYPE_MASK 0xf
105
106/* Flags for socket, socketpair, accept4 */
107#define SOCK_CLOEXEC O_CLOEXEC
108#ifndef SOCK_NONBLOCK
109#define SOCK_NONBLOCK O_NONBLOCK
110#endif
111
112#endif /* ARCH_HAS_SOCKET_TYPES */
113
114enum sock_shutdown_cmd {
115 SHUT_RD = 0,
116 SHUT_WR = 1,
117 SHUT_RDWR = 2,
118};
119
120struct socket_wq {
121 /* Note: wait MUST be first field of socket_wq */
122 wait_queue_head_t wait;
123 struct fasync_struct *fasync_list;
124 struct rcu_head rcu;
125} ____cacheline_aligned_in_smp;
126
127/**
128 * struct socket - general BSD socket
129 * @state: socket state (%SS_CONNECTED, etc)
130 * @type: socket type (%SOCK_STREAM, etc)
131 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
132 * @ops: protocol specific socket operations
133 * @file: File back pointer for gc
134 * @sk: internal networking protocol agnostic socket representation
135 * @wq: wait queue for several uses
136 */
137struct socket {
138 socket_state state;
139
140 kmemcheck_bitfield_begin(type);
141 short type;
142 kmemcheck_bitfield_end(type);
143
144 unsigned long flags;
145
146 struct socket_wq __rcu *wq;
147
148 struct file *file;
149 struct sock *sk;
150 const struct proto_ops *ops;
151};
152
153struct vm_area_struct;
154struct page;
155struct kiocb;
156struct sockaddr;
157struct msghdr;
158struct module;
159
160struct proto_ops {
161 int family;
162 struct module *owner;
163 int (*release) (struct socket *sock);
164 int (*bind) (struct socket *sock,
165 struct sockaddr *myaddr,
166 int sockaddr_len);
167 int (*connect) (struct socket *sock,
168 struct sockaddr *vaddr,
169 int sockaddr_len, int flags);
170 int (*socketpair)(struct socket *sock1,
171 struct socket *sock2);
172 int (*accept) (struct socket *sock,
173 struct socket *newsock, int flags);
174 int (*getname) (struct socket *sock,
175 struct sockaddr *addr,
176 int *sockaddr_len, int peer);
177 unsigned int (*poll) (struct file *file, struct socket *sock,
178 struct poll_table_struct *wait);
179 int (*ioctl) (struct socket *sock, unsigned int cmd,
180 unsigned long arg);
181#ifdef CONFIG_COMPAT
182 int (*compat_ioctl) (struct socket *sock, unsigned int cmd,
183 unsigned long arg);
184#endif
185 int (*listen) (struct socket *sock, int len);
186 int (*shutdown) (struct socket *sock, int flags);
187 int (*setsockopt)(struct socket *sock, int level,
188 int optname, char __user *optval, unsigned int optlen);
189 int (*getsockopt)(struct socket *sock, int level,
190 int optname, char __user *optval, int __user *optlen);
191#ifdef CONFIG_COMPAT
192 int (*compat_setsockopt)(struct socket *sock, int level,
193 int optname, char __user *optval, unsigned int optlen);
194 int (*compat_getsockopt)(struct socket *sock, int level,
195 int optname, char __user *optval, int __user *optlen);
196#endif
197 int (*sendmsg) (struct kiocb *iocb, struct socket *sock,
198 struct msghdr *m, size_t total_len);
199 int (*recvmsg) (struct kiocb *iocb, struct socket *sock,
200 struct msghdr *m, size_t total_len,
201 int flags);
202 int (*mmap) (struct file *file, struct socket *sock,
203 struct vm_area_struct * vma);
204 ssize_t (*sendpage) (struct socket *sock, struct page *page,
205 int offset, size_t size, int flags);
206 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
207 struct pipe_inode_info *pipe, size_t len, unsigned int flags);
208};
209
210#define DECLARE_SOCKADDR(type, dst, src) \
211 type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
212
213struct net_proto_family {
214 int family;
215 int (*create)(struct net *net, struct socket *sock,
216 int protocol, int kern);
217 struct module *owner;
218};
219
220struct iovec;
221struct kvec;
222
223enum {
224 SOCK_WAKE_IO,
225 SOCK_WAKE_WAITD,
226 SOCK_WAKE_SPACE,
227 SOCK_WAKE_URG,
228};
229
230extern int sock_wake_async(struct socket *sk, int how, int band);
231extern int sock_register(const struct net_proto_family *fam);
232extern void sock_unregister(int family);
233extern int __sock_create(struct net *net, int family, int type, int proto,
234 struct socket **res, int kern);
235extern int sock_create(int family, int type, int proto,
236 struct socket **res);
237extern int sock_create_kern(int family, int type, int proto,
238 struct socket **res);
239extern int sock_create_lite(int family, int type, int proto,
240 struct socket **res);
241extern void sock_release(struct socket *sock);
242extern int sock_sendmsg(struct socket *sock, struct msghdr *msg,
243 size_t len);
244extern int sock_recvmsg(struct socket *sock, struct msghdr *msg,
245 size_t size, int flags);
246extern int sock_map_fd(struct socket *sock, int flags);
247extern struct socket *sockfd_lookup(int fd, int *err);
248#define sockfd_put(sock) fput(sock->file)
249extern int net_ratelimit(void);
250
251#define net_random() random32()
252#define net_srandom(seed) srandom32((__force u32)seed)
253
254extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
255 struct kvec *vec, size_t num, size_t len);
256extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
257 struct kvec *vec, size_t num,
258 size_t len, int flags);
259
260extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
261 int addrlen);
262extern int kernel_listen(struct socket *sock, int backlog);
263extern int kernel_accept(struct socket *sock, struct socket **newsock,
264 int flags);
265extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
266 int addrlen, int flags);
267extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
268 int *addrlen);
269extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
270 int *addrlen);
271extern int kernel_getsockopt(struct socket *sock, int level, int optname,
272 char *optval, int *optlen);
273extern int kernel_setsockopt(struct socket *sock, int level, int optname,
274 char *optval, unsigned int optlen);
275extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
276 size_t size, int flags);
277extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
278extern int kernel_sock_shutdown(struct socket *sock,
279 enum sock_shutdown_cmd how);
280
281#define MODULE_ALIAS_NETPROTO(proto) \
282 MODULE_ALIAS("net-pf-" __stringify(proto))
283
284#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
285 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
286
287#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
288 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
289 "-type-" __stringify(type))
290
291#ifdef CONFIG_SYSCTL
292#include <linux/sysctl.h>
293#include <linux/ratelimit.h>
294extern struct ratelimit_state net_ratelimit_state;
295#endif
296
297#endif /* __KERNEL__ */
298#endif /* _LINUX_NET_H */