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1da177e4 LT |
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> | |
02c30a84 | 10 | * Ross Biro |
1da177e4 LT |
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 | ||
eacf17bd | 21 | #include <linux/stringify.h> |
cb4db4c2 | 22 | #include <linux/random.h> |
5770a3fb DW |
23 | #include <linux/wait.h> |
24 | #include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */ | |
29a020d3 | 25 | #include <linux/kmemcheck.h> |
43815482 | 26 | #include <linux/rcupdate.h> |
c68c7f5a | 27 | #include <linux/jump_label.h> |
607ca46e | 28 | #include <uapi/linux/net.h> |
5770a3fb DW |
29 | |
30 | struct poll_table_struct; | |
31 | struct pipe_inode_info; | |
32 | struct inode; | |
56b31d1c | 33 | struct file; |
5770a3fb | 34 | struct net; |
1da177e4 LT |
35 | |
36 | #define SOCK_ASYNC_NOSPACE 0 | |
37 | #define SOCK_ASYNC_WAITDATA 1 | |
38 | #define SOCK_NOSPACE 2 | |
39 | #define SOCK_PASSCRED 3 | |
877ce7c1 | 40 | #define SOCK_PASSSEC 4 |
b09e786b | 41 | #define SOCK_EXTERNALLY_ALLOCATED 5 |
1da177e4 LT |
42 | |
43 | #ifndef ARCH_HAS_SOCKET_TYPES | |
4dc3b16b PP |
44 | /** |
45 | * enum sock_type - Socket types | |
46 | * @SOCK_STREAM: stream (connection) socket | |
47 | * @SOCK_DGRAM: datagram (conn.less) socket | |
48 | * @SOCK_RAW: raw socket | |
49 | * @SOCK_RDM: reliably-delivered message | |
50 | * @SOCK_SEQPACKET: sequential packet socket | |
8f2709b5 | 51 | * @SOCK_DCCP: Datagram Congestion Control Protocol socket |
4dc3b16b PP |
52 | * @SOCK_PACKET: linux specific way of getting packets at the dev level. |
53 | * For writing rarp and other similar things on the user level. | |
54 | * | |
1da177e4 LT |
55 | * When adding some new socket type please |
56 | * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS | |
57 | * overrides this enum for binary compat reasons. | |
1da177e4 LT |
58 | */ |
59 | enum sock_type { | |
60 | SOCK_STREAM = 1, | |
61 | SOCK_DGRAM = 2, | |
62 | SOCK_RAW = 3, | |
63 | SOCK_RDM = 4, | |
64 | SOCK_SEQPACKET = 5, | |
7c657876 | 65 | SOCK_DCCP = 6, |
1da177e4 LT |
66 | SOCK_PACKET = 10, |
67 | }; | |
68 | ||
69 | #define SOCK_MAX (SOCK_PACKET + 1) | |
a677a039 UD |
70 | /* Mask which covers at least up to SOCK_MASK-1. The |
71 | * remaining bits are used as flags. */ | |
72 | #define SOCK_TYPE_MASK 0xf | |
73 | ||
de11defe | 74 | /* Flags for socket, socketpair, accept4 */ |
a677a039 | 75 | #define SOCK_CLOEXEC O_CLOEXEC |
c019bbc6 UD |
76 | #ifndef SOCK_NONBLOCK |
77 | #define SOCK_NONBLOCK O_NONBLOCK | |
78 | #endif | |
1da177e4 LT |
79 | |
80 | #endif /* ARCH_HAS_SOCKET_TYPES */ | |
81 | ||
91cf45f0 | 82 | enum sock_shutdown_cmd { |
0e9649c1 JS |
83 | SHUT_RD, |
84 | SHUT_WR, | |
85 | SHUT_RDWR, | |
91cf45f0 TM |
86 | }; |
87 | ||
43815482 | 88 | struct socket_wq { |
eaefd110 | 89 | /* Note: wait MUST be first field of socket_wq */ |
43815482 ED |
90 | wait_queue_head_t wait; |
91 | struct fasync_struct *fasync_list; | |
92 | struct rcu_head rcu; | |
93 | } ____cacheline_aligned_in_smp; | |
94 | ||
1da177e4 LT |
95 | /** |
96 | * struct socket - general BSD socket | |
4dc3b16b | 97 | * @state: socket state (%SS_CONNECTED, etc) |
2c693610 | 98 | * @type: socket type (%SOCK_STREAM, etc) |
4dc3b16b PP |
99 | * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) |
100 | * @ops: protocol specific socket operations | |
4dc3b16b PP |
101 | * @file: File back pointer for gc |
102 | * @sk: internal networking protocol agnostic socket representation | |
e2aec372 | 103 | * @wq: wait queue for several uses |
1da177e4 LT |
104 | */ |
105 | struct socket { | |
106 | socket_state state; | |
29a020d3 ED |
107 | |
108 | kmemcheck_bitfield_begin(type); | |
2c693610 | 109 | short type; |
29a020d3 ED |
110 | kmemcheck_bitfield_end(type); |
111 | ||
1da177e4 | 112 | unsigned long flags; |
43815482 | 113 | |
eaefd110 | 114 | struct socket_wq __rcu *wq; |
8bdd663a | 115 | |
1da177e4 LT |
116 | struct file *file; |
117 | struct sock *sk; | |
8bdd663a | 118 | const struct proto_ops *ops; |
1da177e4 LT |
119 | }; |
120 | ||
121 | struct vm_area_struct; | |
122 | struct page; | |
123 | struct kiocb; | |
124 | struct sockaddr; | |
125 | struct msghdr; | |
126 | struct module; | |
127 | ||
128 | struct proto_ops { | |
129 | int family; | |
130 | struct module *owner; | |
131 | int (*release) (struct socket *sock); | |
132 | int (*bind) (struct socket *sock, | |
133 | struct sockaddr *myaddr, | |
134 | int sockaddr_len); | |
135 | int (*connect) (struct socket *sock, | |
136 | struct sockaddr *vaddr, | |
137 | int sockaddr_len, int flags); | |
138 | int (*socketpair)(struct socket *sock1, | |
139 | struct socket *sock2); | |
140 | int (*accept) (struct socket *sock, | |
141 | struct socket *newsock, int flags); | |
142 | int (*getname) (struct socket *sock, | |
143 | struct sockaddr *addr, | |
144 | int *sockaddr_len, int peer); | |
145 | unsigned int (*poll) (struct file *file, struct socket *sock, | |
146 | struct poll_table_struct *wait); | |
147 | int (*ioctl) (struct socket *sock, unsigned int cmd, | |
148 | unsigned long arg); | |
1621e094 | 149 | #ifdef CONFIG_COMPAT |
89bbfc95 SP |
150 | int (*compat_ioctl) (struct socket *sock, unsigned int cmd, |
151 | unsigned long arg); | |
1621e094 | 152 | #endif |
1da177e4 LT |
153 | int (*listen) (struct socket *sock, int len); |
154 | int (*shutdown) (struct socket *sock, int flags); | |
155 | int (*setsockopt)(struct socket *sock, int level, | |
b7058842 | 156 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 LT |
157 | int (*getsockopt)(struct socket *sock, int level, |
158 | int optname, char __user *optval, int __user *optlen); | |
1621e094 | 159 | #ifdef CONFIG_COMPAT |
3fdadf7d | 160 | int (*compat_setsockopt)(struct socket *sock, int level, |
b7058842 | 161 | int optname, char __user *optval, unsigned int optlen); |
3fdadf7d DM |
162 | int (*compat_getsockopt)(struct socket *sock, int level, |
163 | int optname, char __user *optval, int __user *optlen); | |
1621e094 | 164 | #endif |
1da177e4 LT |
165 | int (*sendmsg) (struct kiocb *iocb, struct socket *sock, |
166 | struct msghdr *m, size_t total_len); | |
f3d33426 HFS |
167 | /* Notes for implementing recvmsg: |
168 | * =============================== | |
169 | * msg->msg_namelen should get updated by the recvmsg handlers | |
170 | * iff msg_name != NULL. It is by default 0 to prevent | |
171 | * returning uninitialized memory to user space. The recvfrom | |
172 | * handlers can assume that msg.msg_name is either NULL or has | |
173 | * a minimum size of sizeof(struct sockaddr_storage). | |
174 | */ | |
1da177e4 LT |
175 | int (*recvmsg) (struct kiocb *iocb, struct socket *sock, |
176 | struct msghdr *m, size_t total_len, | |
177 | int flags); | |
178 | int (*mmap) (struct file *file, struct socket *sock, | |
179 | struct vm_area_struct * vma); | |
180 | ssize_t (*sendpage) (struct socket *sock, struct page *page, | |
181 | int offset, size_t size, int flags); | |
9c55e01c JA |
182 | ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, |
183 | struct pipe_inode_info *pipe, size_t len, unsigned int flags); | |
12663bfc | 184 | int (*set_peek_off)(struct sock *sk, int val); |
1da177e4 LT |
185 | }; |
186 | ||
38bfd8f5 CG |
187 | #define DECLARE_SOCKADDR(type, dst, src) \ |
188 | type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; }) | |
189 | ||
1da177e4 LT |
190 | struct net_proto_family { |
191 | int family; | |
3f378b68 EP |
192 | int (*create)(struct net *net, struct socket *sock, |
193 | int protocol, int kern); | |
1da177e4 LT |
194 | struct module *owner; |
195 | }; | |
196 | ||
197 | struct iovec; | |
198 | struct kvec; | |
199 | ||
8d8ad9d7 PE |
200 | enum { |
201 | SOCK_WAKE_IO, | |
202 | SOCK_WAKE_WAITD, | |
203 | SOCK_WAKE_SPACE, | |
204 | SOCK_WAKE_URG, | |
205 | }; | |
206 | ||
7965bd4d JP |
207 | int sock_wake_async(struct socket *sk, int how, int band); |
208 | int sock_register(const struct net_proto_family *fam); | |
209 | void sock_unregister(int family); | |
210 | int __sock_create(struct net *net, int family, int type, int proto, | |
211 | struct socket **res, int kern); | |
212 | int sock_create(int family, int type, int proto, struct socket **res); | |
213 | int sock_create_kern(int family, int type, int proto, struct socket **res); | |
214 | int sock_create_lite(int family, int type, int proto, struct socket **res); | |
215 | void sock_release(struct socket *sock); | |
216 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t len); | |
217 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, | |
218 | int flags); | |
219 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname); | |
220 | struct socket *sockfd_lookup(int fd, int *err); | |
221 | struct socket *sock_from_file(struct file *file, int *err); | |
1da177e4 | 222 | #define sockfd_put(sock) fput(sock->file) |
7965bd4d | 223 | int net_ratelimit(void); |
aaa248f6 | 224 | |
3a3bfb61 JP |
225 | #define net_ratelimited_function(function, ...) \ |
226 | do { \ | |
227 | if (net_ratelimit()) \ | |
228 | function(__VA_ARGS__); \ | |
229 | } while (0) | |
230 | ||
231 | #define net_emerg_ratelimited(fmt, ...) \ | |
232 | net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__) | |
233 | #define net_alert_ratelimited(fmt, ...) \ | |
234 | net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__) | |
235 | #define net_crit_ratelimited(fmt, ...) \ | |
236 | net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__) | |
237 | #define net_err_ratelimited(fmt, ...) \ | |
238 | net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__) | |
239 | #define net_notice_ratelimited(fmt, ...) \ | |
240 | net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__) | |
241 | #define net_warn_ratelimited(fmt, ...) \ | |
242 | net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__) | |
243 | #define net_info_ratelimited(fmt, ...) \ | |
244 | net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__) | |
245 | #define net_dbg_ratelimited(fmt, ...) \ | |
246 | net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__) | |
247 | ||
a48e4292 HFS |
248 | bool __net_get_random_once(void *buf, int nbytes, bool *done, |
249 | struct static_key *done_key); | |
250 | ||
251 | #ifdef HAVE_JUMP_LABEL | |
252 | #define ___NET_RANDOM_STATIC_KEY_INIT ((struct static_key) \ | |
253 | { .enabled = ATOMIC_INIT(0), .entries = (void *)1 }) | |
254 | #else /* !HAVE_JUMP_LABEL */ | |
255 | #define ___NET_RANDOM_STATIC_KEY_INIT STATIC_KEY_INIT_FALSE | |
256 | #endif /* HAVE_JUMP_LABEL */ | |
257 | ||
a48e4292 HFS |
258 | #define net_get_random_once(buf, nbytes) \ |
259 | ({ \ | |
260 | bool ___ret = false; \ | |
261 | static bool ___done = false; \ | |
262 | static struct static_key ___done_key = \ | |
263 | ___NET_RANDOM_STATIC_KEY_INIT; \ | |
264 | if (!static_key_true(&___done_key)) \ | |
265 | ___ret = __net_get_random_once(buf, \ | |
266 | nbytes, \ | |
267 | &___done, \ | |
268 | &___done_key); \ | |
269 | ___ret; \ | |
270 | }) | |
271 | ||
7965bd4d JP |
272 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec, |
273 | size_t num, size_t len); | |
274 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec, | |
275 | size_t num, size_t len, int flags); | |
1da177e4 | 276 | |
7965bd4d JP |
277 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen); |
278 | int kernel_listen(struct socket *sock, int backlog); | |
279 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags); | |
280 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
281 | int flags); | |
282 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
283 | int *addrlen); | |
284 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
285 | int *addrlen); | |
286 | int kernel_getsockopt(struct socket *sock, int level, int optname, char *optval, | |
287 | int *optlen); | |
288 | int kernel_setsockopt(struct socket *sock, int level, int optname, char *optval, | |
289 | unsigned int optlen); | |
290 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
291 | size_t size, int flags); | |
292 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); | |
293 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how); | |
ac5a488e | 294 | |
1da177e4 LT |
295 | #define MODULE_ALIAS_NETPROTO(proto) \ |
296 | MODULE_ALIAS("net-pf-" __stringify(proto)) | |
297 | ||
4fdb3bb7 HW |
298 | #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ |
299 | MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) | |
300 | ||
305e1e96 JD |
301 | #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ |
302 | MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ | |
303 | "-type-" __stringify(type)) | |
304 | ||
2033e9bf NH |
305 | #define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \ |
306 | MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ | |
307 | name) | |
1da177e4 | 308 | #endif /* _LINUX_NET_H */ |