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