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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/wait.h>
22#include <asm/socket.h>
23
24struct poll_table_struct;
25struct pipe_inode_info;
26struct inode;
27struct net;
28
29#define NPROTO 34 /* should be enough for now.. */
30
31#define SYS_SOCKET 1 /* sys_socket(2) */
32#define SYS_BIND 2 /* sys_bind(2) */
33#define SYS_CONNECT 3 /* sys_connect(2) */
34#define SYS_LISTEN 4 /* sys_listen(2) */
35#define SYS_ACCEPT 5 /* sys_accept(2) */
36#define SYS_GETSOCKNAME 6 /* sys_getsockname(2) */
37#define SYS_GETPEERNAME 7 /* sys_getpeername(2) */
38#define SYS_SOCKETPAIR 8 /* sys_socketpair(2) */
39#define SYS_SEND 9 /* sys_send(2) */
40#define SYS_RECV 10 /* sys_recv(2) */
41#define SYS_SENDTO 11 /* sys_sendto(2) */
42#define SYS_RECVFROM 12 /* sys_recvfrom(2) */
43#define SYS_SHUTDOWN 13 /* sys_shutdown(2) */
44#define SYS_SETSOCKOPT 14 /* sys_setsockopt(2) */
45#define SYS_GETSOCKOPT 15 /* sys_getsockopt(2) */
46#define SYS_SENDMSG 16 /* sys_sendmsg(2) */
47#define SYS_RECVMSG 17 /* sys_recvmsg(2) */
48
49typedef enum {
50 SS_FREE = 0, /* not allocated */
51 SS_UNCONNECTED, /* unconnected to any socket */
52 SS_CONNECTING, /* in process of connecting */
53 SS_CONNECTED, /* connected to socket */
54 SS_DISCONNECTING /* in process of disconnecting */
55} socket_state;
56
57#define __SO_ACCEPTCON (1 << 16) /* performed a listen */
58
59#ifdef __KERNEL__
60#include <linux/stringify.h>
61#include <linux/random.h>
62
63#define SOCK_ASYNC_NOSPACE 0
64#define SOCK_ASYNC_WAITDATA 1
65#define SOCK_NOSPACE 2
66#define SOCK_PASSCRED 3
67#define SOCK_PASSSEC 4
68
69#ifndef ARCH_HAS_SOCKET_TYPES
70/**
71 * enum sock_type - Socket types
72 * @SOCK_STREAM: stream (connection) socket
73 * @SOCK_DGRAM: datagram (conn.less) socket
74 * @SOCK_RAW: raw socket
75 * @SOCK_RDM: reliably-delivered message
76 * @SOCK_SEQPACKET: sequential packet socket
77 * @SOCK_DCCP: Datagram Congestion Control Protocol socket
78 * @SOCK_PACKET: linux specific way of getting packets at the dev level.
79 * For writing rarp and other similar things on the user level.
80 *
81 * When adding some new socket type please
82 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
83 * overrides this enum for binary compat reasons.
84 */
85enum sock_type {
86 SOCK_STREAM = 1,
87 SOCK_DGRAM = 2,
88 SOCK_RAW = 3,
89 SOCK_RDM = 4,
90 SOCK_SEQPACKET = 5,
91 SOCK_DCCP = 6,
92 SOCK_PACKET = 10,
93};
94
95#define SOCK_MAX (SOCK_PACKET + 1)
96
97#endif /* ARCH_HAS_SOCKET_TYPES */
98
99enum sock_shutdown_cmd {
100 SHUT_RD = 0,
101 SHUT_WR = 1,
102 SHUT_RDWR = 2,
103};
104
105/**
106 * struct socket - general BSD socket
107 * @state: socket state (%SS_CONNECTED, etc)
108 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
109 * @ops: protocol specific socket operations
110 * @fasync_list: Asynchronous wake up list
111 * @file: File back pointer for gc
112 * @sk: internal networking protocol agnostic socket representation
113 * @wait: wait queue for several uses
114 * @type: socket type (%SOCK_STREAM, etc)
115 */
116struct socket {
117 socket_state state;
118 unsigned long flags;
119 const struct proto_ops *ops;
120 struct fasync_struct *fasync_list;
121 struct file *file;
122 struct sock *sk;
123 wait_queue_head_t wait;
124 short type;
125};
126
127struct vm_area_struct;
128struct page;
129struct kiocb;
130struct sockaddr;
131struct msghdr;
132struct module;
133
134struct proto_ops {
135 int family;
136 struct module *owner;
137 int (*release) (struct socket *sock);
138 int (*bind) (struct socket *sock,
139 struct sockaddr *myaddr,
140 int sockaddr_len);
141 int (*connect) (struct socket *sock,
142 struct sockaddr *vaddr,
143 int sockaddr_len, int flags);
144 int (*socketpair)(struct socket *sock1,
145 struct socket *sock2);
146 int (*accept) (struct socket *sock,
147 struct socket *newsock, int flags);
148 int (*getname) (struct socket *sock,
149 struct sockaddr *addr,
150 int *sockaddr_len, int peer);
151 unsigned int (*poll) (struct file *file, struct socket *sock,
152 struct poll_table_struct *wait);
153 int (*ioctl) (struct socket *sock, unsigned int cmd,
154 unsigned long arg);
155 int (*compat_ioctl) (struct socket *sock, unsigned int cmd,
156 unsigned long arg);
157 int (*listen) (struct socket *sock, int len);
158 int (*shutdown) (struct socket *sock, int flags);
159 int (*setsockopt)(struct socket *sock, int level,
160 int optname, char __user *optval, int optlen);
161 int (*getsockopt)(struct socket *sock, int level,
162 int optname, char __user *optval, int __user *optlen);
163 int (*compat_setsockopt)(struct socket *sock, int level,
164 int optname, char __user *optval, int optlen);
165 int (*compat_getsockopt)(struct socket *sock, int level,
166 int optname, char __user *optval, int __user *optlen);
167 int (*sendmsg) (struct kiocb *iocb, struct socket *sock,
168 struct msghdr *m, size_t total_len);
169 int (*recvmsg) (struct kiocb *iocb, struct socket *sock,
170 struct msghdr *m, size_t total_len,
171 int flags);
172 int (*mmap) (struct file *file, struct socket *sock,
173 struct vm_area_struct * vma);
174 ssize_t (*sendpage) (struct socket *sock, struct page *page,
175 int offset, size_t size, int flags);
176 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
177 struct pipe_inode_info *pipe, size_t len, unsigned int flags);
178};
179
180struct net_proto_family {
181 int family;
182 int (*create)(struct net *net, struct socket *sock, int protocol);
183 struct module *owner;
184};
185
186struct iovec;
187struct kvec;
188
189enum {
190 SOCK_WAKE_IO,
191 SOCK_WAKE_WAITD,
192 SOCK_WAKE_SPACE,
193 SOCK_WAKE_URG,
194};
195
196extern int sock_wake_async(struct socket *sk, int how, int band);
197extern int sock_register(const struct net_proto_family *fam);
198extern void sock_unregister(int family);
199extern int sock_create(int family, int type, int proto,
200 struct socket **res);
201extern int sock_create_kern(int family, int type, int proto,
202 struct socket **res);
203extern int sock_create_lite(int family, int type, int proto,
204 struct socket **res);
205extern void sock_release(struct socket *sock);
206extern int sock_sendmsg(struct socket *sock, struct msghdr *msg,
207 size_t len);
208extern int sock_recvmsg(struct socket *sock, struct msghdr *msg,
209 size_t size, int flags);
210extern int sock_map_fd(struct socket *sock);
211extern struct socket *sockfd_lookup(int fd, int *err);
212#define sockfd_put(sock) fput(sock->file)
213extern int net_ratelimit(void);
214
215#define net_random() random32()
216#define net_srandom(seed) srandom32((__force u32)seed)
217
218extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
219 struct kvec *vec, size_t num, size_t len);
220extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
221 struct kvec *vec, size_t num,
222 size_t len, int flags);
223
224extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
225 int addrlen);
226extern int kernel_listen(struct socket *sock, int backlog);
227extern int kernel_accept(struct socket *sock, struct socket **newsock,
228 int flags);
229extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
230 int addrlen, int flags);
231extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
232 int *addrlen);
233extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
234 int *addrlen);
235extern int kernel_getsockopt(struct socket *sock, int level, int optname,
236 char *optval, int *optlen);
237extern int kernel_setsockopt(struct socket *sock, int level, int optname,
238 char *optval, int optlen);
239extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
240 size_t size, int flags);
241extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
242extern int kernel_sock_shutdown(struct socket *sock,
243 enum sock_shutdown_cmd how);
244
245#ifndef CONFIG_SMP
246#define SOCKOPS_WRAPPED(name) name
247#define SOCKOPS_WRAP(name, fam)
248#else
249
250#define SOCKOPS_WRAPPED(name) __unlocked_##name
251
252#define SOCKCALL_WRAP(name, call, parms, args) \
253static int __lock_##name##_##call parms \
254{ \
255 int ret; \
256 lock_kernel(); \
257 ret = __unlocked_##name##_ops.call args ;\
258 unlock_kernel(); \
259 return ret; \
260}
261
262#define SOCKCALL_UWRAP(name, call, parms, args) \
263static unsigned int __lock_##name##_##call parms \
264{ \
265 int ret; \
266 lock_kernel(); \
267 ret = __unlocked_##name##_ops.call args ;\
268 unlock_kernel(); \
269 return ret; \
270}
271
272
273#define SOCKOPS_WRAP(name, fam) \
274SOCKCALL_WRAP(name, release, (struct socket *sock), (sock)) \
275SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
276 (sock, uaddr, addr_len)) \
277SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
278 int addr_len, int flags), \
279 (sock, uaddr, addr_len, flags)) \
280SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
281 (sock1, sock2)) \
282SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
283 int flags), (sock, newsock, flags)) \
284SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
285 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
286SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
287 (file, sock, wait)) \
288SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
289 unsigned long arg), (sock, cmd, arg)) \
290SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \
291 unsigned long arg), (sock, cmd, arg)) \
292SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
293SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
294SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
295 char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \
296SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
297 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \
298SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \
299 (iocb, sock, m, len)) \
300SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \
301 (iocb, sock, m, len, flags)) \
302SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
303 (file, sock, vma)) \
304 \
305static const struct proto_ops name##_ops = { \
306 .family = fam, \
307 .owner = THIS_MODULE, \
308 .release = __lock_##name##_release, \
309 .bind = __lock_##name##_bind, \
310 .connect = __lock_##name##_connect, \
311 .socketpair = __lock_##name##_socketpair, \
312 .accept = __lock_##name##_accept, \
313 .getname = __lock_##name##_getname, \
314 .poll = __lock_##name##_poll, \
315 .ioctl = __lock_##name##_ioctl, \
316 .compat_ioctl = __lock_##name##_compat_ioctl, \
317 .listen = __lock_##name##_listen, \
318 .shutdown = __lock_##name##_shutdown, \
319 .setsockopt = __lock_##name##_setsockopt, \
320 .getsockopt = __lock_##name##_getsockopt, \
321 .sendmsg = __lock_##name##_sendmsg, \
322 .recvmsg = __lock_##name##_recvmsg, \
323 .mmap = __lock_##name##_mmap, \
324};
325
326#endif
327
328#define MODULE_ALIAS_NETPROTO(proto) \
329 MODULE_ALIAS("net-pf-" __stringify(proto))
330
331#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
332 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
333
334#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
335 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
336 "-type-" __stringify(type))
337
338#ifdef CONFIG_SYSCTL
339#include <linux/sysctl.h>
340extern int net_msg_cost;
341extern int net_msg_burst;
342#endif
343
344#endif /* __KERNEL__ */
345#endif /* _LINUX_NET_H */