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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
63struct poll_table_struct;
64struct pipe_inode_info;
65struct inode;
66struct net;
67
68#define SOCK_ASYNC_NOSPACE 0
69#define SOCK_ASYNC_WAITDATA 1
70#define SOCK_NOSPACE 2
71#define SOCK_PASSCRED 3
72#define SOCK_PASSSEC 4
73
74#ifndef ARCH_HAS_SOCKET_TYPES
75/**
76 * enum sock_type - Socket types
77 * @SOCK_STREAM: stream (connection) socket
78 * @SOCK_DGRAM: datagram (conn.less) socket
79 * @SOCK_RAW: raw socket
80 * @SOCK_RDM: reliably-delivered message
81 * @SOCK_SEQPACKET: sequential packet socket
82 * @SOCK_DCCP: Datagram Congestion Control Protocol socket
83 * @SOCK_PACKET: linux specific way of getting packets at the dev level.
84 * For writing rarp and other similar things on the user level.
85 *
86 * When adding some new socket type please
87 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
88 * overrides this enum for binary compat reasons.
89 */
90enum sock_type {
91 SOCK_STREAM = 1,
92 SOCK_DGRAM = 2,
93 SOCK_RAW = 3,
94 SOCK_RDM = 4,
95 SOCK_SEQPACKET = 5,
96 SOCK_DCCP = 6,
97 SOCK_PACKET = 10,
98};
99
100#define SOCK_MAX (SOCK_PACKET + 1)
101/* Mask which covers at least up to SOCK_MASK-1. The
102 * remaining bits are used as flags. */
103#define SOCK_TYPE_MASK 0xf
104
105/* Flags for socket, socketpair, accept4 */
106#define SOCK_CLOEXEC O_CLOEXEC
107#ifndef SOCK_NONBLOCK
108#define SOCK_NONBLOCK O_NONBLOCK
109#endif
110
111#endif /* ARCH_HAS_SOCKET_TYPES */
112
113enum sock_shutdown_cmd {
114 SHUT_RD = 0,
115 SHUT_WR = 1,
116 SHUT_RDWR = 2,
117};
118
119/**
120 * struct socket - general BSD socket
121 * @state: socket state (%SS_CONNECTED, etc)
122 * @type: socket type (%SOCK_STREAM, etc)
123 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
124 * @ops: protocol specific socket operations
125 * @fasync_list: Asynchronous wake up list
126 * @file: File back pointer for gc
127 * @sk: internal networking protocol agnostic socket representation
128 * @wait: wait queue for several uses
129 */
130struct socket {
131 socket_state state;
132
133 kmemcheck_bitfield_begin(type);
134 short type;
135 kmemcheck_bitfield_end(type);
136
137 unsigned long flags;
138 /*
139 * Please keep fasync_list & wait fields in the same cache line
140 */
141 struct fasync_struct *fasync_list;
142 wait_queue_head_t wait;
143
144 struct file *file;
145 struct sock *sk;
146 const struct proto_ops *ops;
147};
148
149struct vm_area_struct;
150struct page;
151struct kiocb;
152struct sockaddr;
153struct msghdr;
154struct module;
155
156struct proto_ops {
157 int family;
158 struct module *owner;
159 int (*release) (struct socket *sock);
160 int (*bind) (struct socket *sock,
161 struct sockaddr *myaddr,
162 int sockaddr_len);
163 int (*connect) (struct socket *sock,
164 struct sockaddr *vaddr,
165 int sockaddr_len, int flags);
166 int (*socketpair)(struct socket *sock1,
167 struct socket *sock2);
168 int (*accept) (struct socket *sock,
169 struct socket *newsock, int flags);
170 int (*getname) (struct socket *sock,
171 struct sockaddr *addr,
172 int *sockaddr_len, int peer);
173 unsigned int (*poll) (struct file *file, struct socket *sock,
174 struct poll_table_struct *wait);
175 int (*ioctl) (struct socket *sock, unsigned int cmd,
176 unsigned long arg);
177#ifdef CONFIG_COMPAT
178 int (*compat_ioctl) (struct socket *sock, unsigned int cmd,
179 unsigned long arg);
180#endif
181 int (*listen) (struct socket *sock, int len);
182 int (*shutdown) (struct socket *sock, int flags);
183 int (*setsockopt)(struct socket *sock, int level,
184 int optname, char __user *optval, unsigned int optlen);
185 int (*getsockopt)(struct socket *sock, int level,
186 int optname, char __user *optval, int __user *optlen);
187#ifdef CONFIG_COMPAT
188 int (*compat_setsockopt)(struct socket *sock, int level,
189 int optname, char __user *optval, unsigned int optlen);
190 int (*compat_getsockopt)(struct socket *sock, int level,
191 int optname, char __user *optval, int __user *optlen);
192#endif
193 int (*sendmsg) (struct kiocb *iocb, struct socket *sock,
194 struct msghdr *m, size_t total_len);
195 int (*recvmsg) (struct kiocb *iocb, struct socket *sock,
196 struct msghdr *m, size_t total_len,
197 int flags);
198 int (*mmap) (struct file *file, struct socket *sock,
199 struct vm_area_struct * vma);
200 ssize_t (*sendpage) (struct socket *sock, struct page *page,
201 int offset, size_t size, int flags);
202 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
203 struct pipe_inode_info *pipe, size_t len, unsigned int flags);
204};
205
206#define DECLARE_SOCKADDR(type, dst, src) \
207 type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
208
209struct net_proto_family {
210 int family;
211 int (*create)(struct net *net, struct socket *sock,
212 int protocol, int kern);
213 struct module *owner;
214};
215
216struct iovec;
217struct kvec;
218
219enum {
220 SOCK_WAKE_IO,
221 SOCK_WAKE_WAITD,
222 SOCK_WAKE_SPACE,
223 SOCK_WAKE_URG,
224};
225
226extern int sock_wake_async(struct socket *sk, int how, int band);
227extern int sock_register(const struct net_proto_family *fam);
228extern void sock_unregister(int family);
229extern int sock_create(int family, int type, int proto,
230 struct socket **res);
231extern int sock_create_kern(int family, int type, int proto,
232 struct socket **res);
233extern int sock_create_lite(int family, int type, int proto,
234 struct socket **res);
235extern void sock_release(struct socket *sock);
236extern int sock_sendmsg(struct socket *sock, struct msghdr *msg,
237 size_t len);
238extern int sock_recvmsg(struct socket *sock, struct msghdr *msg,
239 size_t size, int flags);
240extern int sock_map_fd(struct socket *sock, int flags);
241extern struct socket *sockfd_lookup(int fd, int *err);
242#define sockfd_put(sock) fput(sock->file)
243extern int net_ratelimit(void);
244
245#define net_random() random32()
246#define net_srandom(seed) srandom32((__force u32)seed)
247
248extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
249 struct kvec *vec, size_t num, size_t len);
250extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
251 struct kvec *vec, size_t num,
252 size_t len, int flags);
253
254extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
255 int addrlen);
256extern int kernel_listen(struct socket *sock, int backlog);
257extern int kernel_accept(struct socket *sock, struct socket **newsock,
258 int flags);
259extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
260 int addrlen, int flags);
261extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
262 int *addrlen);
263extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
264 int *addrlen);
265extern int kernel_getsockopt(struct socket *sock, int level, int optname,
266 char *optval, int *optlen);
267extern int kernel_setsockopt(struct socket *sock, int level, int optname,
268 char *optval, unsigned int optlen);
269extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
270 size_t size, int flags);
271extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
272extern int kernel_sock_shutdown(struct socket *sock,
273 enum sock_shutdown_cmd how);
274
275#define MODULE_ALIAS_NETPROTO(proto) \
276 MODULE_ALIAS("net-pf-" __stringify(proto))
277
278#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
279 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
280
281#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
282 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
283 "-type-" __stringify(type))
284
285#ifdef CONFIG_SYSCTL
286#include <linux/sysctl.h>
287#include <linux/ratelimit.h>
288extern struct ratelimit_state net_ratelimit_state;
289#endif
290
291#endif /* __KERNEL__ */
292#endif /* _LINUX_NET_H */