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
7 * Version: @(#)net.h 1.0.3 05/25/93
9 * Authors: Orest Zborowski, <obz@Kodak.COM>
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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.
21 #include <linux/stringify.h>
22 #include <linux/random.h>
23 #include <linux/wait.h>
24 #include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */
25 #include <linux/kmemcheck.h>
26 #include <linux/rcupdate.h>
27 #include <uapi/linux/net.h>
29 struct poll_table_struct;
30 struct pipe_inode_info;
35 #define SOCK_ASYNC_NOSPACE 0
36 #define SOCK_ASYNC_WAITDATA 1
37 #define SOCK_NOSPACE 2
38 #define SOCK_PASSCRED 3
39 #define SOCK_PASSSEC 4
40 #define SOCK_EXTERNALLY_ALLOCATED 5
42 #ifndef ARCH_HAS_SOCKET_TYPES
44 * enum sock_type - Socket types
45 * @SOCK_STREAM: stream (connection) socket
46 * @SOCK_DGRAM: datagram (conn.less) socket
47 * @SOCK_RAW: raw socket
48 * @SOCK_RDM: reliably-delivered message
49 * @SOCK_SEQPACKET: sequential packet socket
50 * @SOCK_DCCP: Datagram Congestion Control Protocol socket
51 * @SOCK_PACKET: linux specific way of getting packets at the dev level.
52 * For writing rarp and other similar things on the user level.
54 * When adding some new socket type please
55 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
56 * overrides this enum for binary compat reasons.
68 #define SOCK_MAX (SOCK_PACKET + 1)
69 /* Mask which covers at least up to SOCK_MASK-1. The
70 * remaining bits are used as flags. */
71 #define SOCK_TYPE_MASK 0xf
73 /* Flags for socket, socketpair, accept4 */
74 #define SOCK_CLOEXEC O_CLOEXEC
76 #define SOCK_NONBLOCK O_NONBLOCK
79 #endif /* ARCH_HAS_SOCKET_TYPES */
81 enum sock_shutdown_cmd {
88 /* Note: wait MUST be first field of socket_wq */
89 wait_queue_head_t wait;
90 struct fasync_struct *fasync_list;
92 } ____cacheline_aligned_in_smp;
95 * struct socket - general BSD socket
96 * @state: socket state (%SS_CONNECTED, etc)
97 * @type: socket type (%SOCK_STREAM, etc)
98 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
99 * @ops: protocol specific socket operations
100 * @file: File back pointer for gc
101 * @sk: internal networking protocol agnostic socket representation
102 * @wq: wait queue for several uses
107 kmemcheck_bitfield_begin(type);
109 kmemcheck_bitfield_end(type);
113 struct socket_wq __rcu *wq;
117 const struct proto_ops *ops;
120 struct vm_area_struct;
129 struct module *owner;
130 int (*release) (struct socket *sock);
131 int (*bind) (struct socket *sock,
132 struct sockaddr *myaddr,
134 int (*connect) (struct socket *sock,
135 struct sockaddr *vaddr,
136 int sockaddr_len, int flags);
137 int (*socketpair)(struct socket *sock1,
138 struct socket *sock2);
139 int (*accept) (struct socket *sock,
140 struct socket *newsock, int flags);
141 int (*getname) (struct socket *sock,
142 struct sockaddr *addr,
143 int *sockaddr_len, int peer);
144 unsigned int (*poll) (struct file *file, struct socket *sock,
145 struct poll_table_struct *wait);
146 int (*ioctl) (struct socket *sock, unsigned int cmd,
149 int (*compat_ioctl) (struct socket *sock, unsigned int cmd,
152 int (*listen) (struct socket *sock, int len);
153 int (*shutdown) (struct socket *sock, int flags);
154 int (*setsockopt)(struct socket *sock, int level,
155 int optname, char __user *optval, unsigned int optlen);
156 int (*getsockopt)(struct socket *sock, int level,
157 int optname, char __user *optval, int __user *optlen);
159 int (*compat_setsockopt)(struct socket *sock, int level,
160 int optname, char __user *optval, unsigned int optlen);
161 int (*compat_getsockopt)(struct socket *sock, int level,
162 int optname, char __user *optval, int __user *optlen);
164 int (*sendmsg) (struct kiocb *iocb, struct socket *sock,
165 struct msghdr *m, size_t total_len);
166 int (*recvmsg) (struct kiocb *iocb, struct socket *sock,
167 struct msghdr *m, size_t total_len,
169 int (*mmap) (struct file *file, struct socket *sock,
170 struct vm_area_struct * vma);
171 ssize_t (*sendpage) (struct socket *sock, struct page *page,
172 int offset, size_t size, int flags);
173 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
174 struct pipe_inode_info *pipe, size_t len, unsigned int flags);
175 void (*set_peek_off)(struct sock *sk, int val);
178 #define DECLARE_SOCKADDR(type, dst, src) \
179 type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
181 struct net_proto_family {
183 int (*create)(struct net *net, struct socket *sock,
184 int protocol, int kern);
185 struct module *owner;
198 extern int sock_wake_async(struct socket *sk, int how, int band);
199 extern int sock_register(const struct net_proto_family *fam);
200 extern void sock_unregister(int family);
201 extern int __sock_create(struct net *net, int family, int type, int proto,
202 struct socket **res, int kern);
203 extern int sock_create(int family, int type, int proto,
204 struct socket **res);
205 extern int sock_create_kern(int family, int type, int proto,
206 struct socket **res);
207 extern int sock_create_lite(int family, int type, int proto,
208 struct socket **res);
209 extern void sock_release(struct socket *sock);
210 extern int sock_sendmsg(struct socket *sock, struct msghdr *msg,
212 extern int sock_recvmsg(struct socket *sock, struct msghdr *msg,
213 size_t size, int flags);
214 extern struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname);
215 extern struct socket *sockfd_lookup(int fd, int *err);
216 extern struct socket *sock_from_file(struct file *file, int *err);
217 #define sockfd_put(sock) fput(sock->file)
218 extern int net_ratelimit(void);
220 #define net_ratelimited_function(function, ...) \
222 if (net_ratelimit()) \
223 function(__VA_ARGS__); \
226 #define net_emerg_ratelimited(fmt, ...) \
227 net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__)
228 #define net_alert_ratelimited(fmt, ...) \
229 net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__)
230 #define net_crit_ratelimited(fmt, ...) \
231 net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__)
232 #define net_err_ratelimited(fmt, ...) \
233 net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__)
234 #define net_notice_ratelimited(fmt, ...) \
235 net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__)
236 #define net_warn_ratelimited(fmt, ...) \
237 net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__)
238 #define net_info_ratelimited(fmt, ...) \
239 net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
240 #define net_dbg_ratelimited(fmt, ...) \
241 net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
243 #define net_random() random32()
244 #define net_srandom(seed) srandom32((__force u32)seed)
246 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
247 struct kvec *vec, size_t num, size_t len);
248 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
249 struct kvec *vec, size_t num,
250 size_t len, int flags);
252 extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
254 extern int kernel_listen(struct socket *sock, int backlog);
255 extern int kernel_accept(struct socket *sock, struct socket **newsock,
257 extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
258 int addrlen, int flags);
259 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
261 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
263 extern int kernel_getsockopt(struct socket *sock, int level, int optname,
264 char *optval, int *optlen);
265 extern int kernel_setsockopt(struct socket *sock, int level, int optname,
266 char *optval, unsigned int optlen);
267 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
268 size_t size, int flags);
269 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
270 extern int kernel_sock_shutdown(struct socket *sock,
271 enum sock_shutdown_cmd how);
273 #define MODULE_ALIAS_NETPROTO(proto) \
274 MODULE_ALIAS("net-pf-" __stringify(proto))
276 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
277 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
279 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
280 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
281 "-type-" __stringify(type))
283 #define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
284 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
286 #endif /* _LINUX_NET_H */