Commit | Line | Data |
---|---|---|
2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * NET An implementation of the SOCKET network access protocol. | |
4 | * This is the master header file for the Linux NET layer, | |
5 | * or, in plain English: the networking handling part of the | |
6 | * kernel. | |
7 | * | |
8 | * Version: @(#)net.h 1.0.3 05/25/93 | |
9 | * | |
10 | * Authors: Orest Zborowski, <obz@Kodak.COM> | |
02c30a84 | 11 | * Ross Biro |
1da177e4 | 12 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
1da177e4 LT |
13 | */ |
14 | #ifndef _LINUX_NET_H | |
15 | #define _LINUX_NET_H | |
16 | ||
eacf17bd | 17 | #include <linux/stringify.h> |
cb4db4c2 | 18 | #include <linux/random.h> |
5770a3fb DW |
19 | #include <linux/wait.h> |
20 | #include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */ | |
43815482 | 21 | #include <linux/rcupdate.h> |
46234253 | 22 | #include <linux/once.h> |
0294b625 | 23 | #include <linux/fs.h> |
46234253 | 24 | |
607ca46e | 25 | #include <uapi/linux/net.h> |
5770a3fb DW |
26 | |
27 | struct poll_table_struct; | |
28 | struct pipe_inode_info; | |
29 | struct inode; | |
56b31d1c | 30 | struct file; |
5770a3fb | 31 | struct net; |
1da177e4 | 32 | |
ceb5d58b ED |
33 | /* Historically, SOCKWQ_ASYNC_NOSPACE & SOCKWQ_ASYNC_WAITDATA were located |
34 | * in sock->flags, but moved into sk->sk_wq->flags to be RCU protected. | |
b3dc8f77 | 35 | * Eventually all flags will be in sk->sk_wq->flags. |
ceb5d58b | 36 | */ |
9cd3e072 ED |
37 | #define SOCKWQ_ASYNC_NOSPACE 0 |
38 | #define SOCKWQ_ASYNC_WAITDATA 1 | |
1da177e4 LT |
39 | #define SOCK_NOSPACE 2 |
40 | #define SOCK_PASSCRED 3 | |
877ce7c1 | 41 | #define SOCK_PASSSEC 4 |
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 | ||
8a3c245c PT |
82 | /** |
83 | * enum sock_shutdown_cmd - Shutdown types | |
84 | * @SHUT_RD: shutdown receptions | |
85 | * @SHUT_WR: shutdown transmissions | |
86 | * @SHUT_RDWR: shutdown receptions/transmissions | |
87 | */ | |
91cf45f0 | 88 | enum sock_shutdown_cmd { |
0e9649c1 JS |
89 | SHUT_RD, |
90 | SHUT_WR, | |
91 | SHUT_RDWR, | |
91cf45f0 TM |
92 | }; |
93 | ||
43815482 | 94 | struct socket_wq { |
eaefd110 | 95 | /* Note: wait MUST be first field of socket_wq */ |
43815482 ED |
96 | wait_queue_head_t wait; |
97 | struct fasync_struct *fasync_list; | |
ceb5d58b | 98 | unsigned long flags; /* %SOCKWQ_ASYNC_NOSPACE, etc */ |
43815482 ED |
99 | struct rcu_head rcu; |
100 | } ____cacheline_aligned_in_smp; | |
101 | ||
1da177e4 LT |
102 | /** |
103 | * struct socket - general BSD socket | |
4dc3b16b | 104 | * @state: socket state (%SS_CONNECTED, etc) |
2c693610 | 105 | * @type: socket type (%SOCK_STREAM, etc) |
9cd3e072 | 106 | * @flags: socket flags (%SOCK_NOSPACE, etc) |
4dc3b16b | 107 | * @ops: protocol specific socket operations |
4dc3b16b PP |
108 | * @file: File back pointer for gc |
109 | * @sk: internal networking protocol agnostic socket representation | |
e2aec372 | 110 | * @wq: wait queue for several uses |
1da177e4 LT |
111 | */ |
112 | struct socket { | |
113 | socket_state state; | |
29a020d3 | 114 | |
2c693610 | 115 | short type; |
29a020d3 | 116 | |
1da177e4 | 117 | unsigned long flags; |
43815482 | 118 | |
1da177e4 LT |
119 | struct file *file; |
120 | struct sock *sk; | |
8bdd663a | 121 | const struct proto_ops *ops; |
333f7909 AV |
122 | |
123 | struct socket_wq wq; | |
1da177e4 LT |
124 | }; |
125 | ||
126 | struct vm_area_struct; | |
127 | struct page; | |
1da177e4 LT |
128 | struct sockaddr; |
129 | struct msghdr; | |
130 | struct module; | |
0294b625 TH |
131 | struct sk_buff; |
132 | typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *, | |
133 | unsigned int, size_t); | |
1da177e4 LT |
134 | |
135 | struct proto_ops { | |
136 | int family; | |
137 | struct module *owner; | |
138 | int (*release) (struct socket *sock); | |
139 | int (*bind) (struct socket *sock, | |
140 | struct sockaddr *myaddr, | |
141 | int sockaddr_len); | |
142 | int (*connect) (struct socket *sock, | |
143 | struct sockaddr *vaddr, | |
144 | int sockaddr_len, int flags); | |
145 | int (*socketpair)(struct socket *sock1, | |
146 | struct socket *sock2); | |
147 | int (*accept) (struct socket *sock, | |
cdfbabfb | 148 | struct socket *newsock, int flags, bool kern); |
1da177e4 LT |
149 | int (*getname) (struct socket *sock, |
150 | struct sockaddr *addr, | |
9b2c45d4 | 151 | int peer); |
a3f8683b | 152 | __poll_t (*poll) (struct file *file, struct socket *sock, |
1da177e4 LT |
153 | struct poll_table_struct *wait); |
154 | int (*ioctl) (struct socket *sock, unsigned int cmd, | |
155 | unsigned long arg); | |
1621e094 | 156 | #ifdef CONFIG_COMPAT |
89bbfc95 SP |
157 | int (*compat_ioctl) (struct socket *sock, unsigned int cmd, |
158 | unsigned long arg); | |
1621e094 | 159 | #endif |
c7cbdbf2 AB |
160 | int (*gettstamp) (struct socket *sock, void __user *userstamp, |
161 | bool timeval, bool time32); | |
1da177e4 LT |
162 | int (*listen) (struct socket *sock, int len); |
163 | int (*shutdown) (struct socket *sock, int flags); | |
164 | int (*setsockopt)(struct socket *sock, int level, | |
b7058842 | 165 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 LT |
166 | int (*getsockopt)(struct socket *sock, int level, |
167 | int optname, char __user *optval, int __user *optlen); | |
1621e094 | 168 | #ifdef CONFIG_COMPAT |
3fdadf7d | 169 | int (*compat_setsockopt)(struct socket *sock, int level, |
b7058842 | 170 | int optname, char __user *optval, unsigned int optlen); |
3fdadf7d DM |
171 | int (*compat_getsockopt)(struct socket *sock, int level, |
172 | int optname, char __user *optval, int __user *optlen); | |
1621e094 | 173 | #endif |
b4653342 | 174 | void (*show_fdinfo)(struct seq_file *m, struct socket *sock); |
1b784140 YX |
175 | int (*sendmsg) (struct socket *sock, struct msghdr *m, |
176 | size_t total_len); | |
f3d33426 HFS |
177 | /* Notes for implementing recvmsg: |
178 | * =============================== | |
179 | * msg->msg_namelen should get updated by the recvmsg handlers | |
180 | * iff msg_name != NULL. It is by default 0 to prevent | |
181 | * returning uninitialized memory to user space. The recvfrom | |
182 | * handlers can assume that msg.msg_name is either NULL or has | |
183 | * a minimum size of sizeof(struct sockaddr_storage). | |
184 | */ | |
1b784140 YX |
185 | int (*recvmsg) (struct socket *sock, struct msghdr *m, |
186 | size_t total_len, int flags); | |
1da177e4 LT |
187 | int (*mmap) (struct file *file, struct socket *sock, |
188 | struct vm_area_struct * vma); | |
189 | ssize_t (*sendpage) (struct socket *sock, struct page *page, | |
190 | int offset, size_t size, int flags); | |
9c55e01c JA |
191 | ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, |
192 | struct pipe_inode_info *pipe, size_t len, unsigned int flags); | |
12663bfc | 193 | int (*set_peek_off)(struct sock *sk, int val); |
1576d986 | 194 | int (*peek_len)(struct socket *sock); |
306b13eb TH |
195 | |
196 | /* The following functions are called internally by kernel with | |
197 | * sock lock already held. | |
198 | */ | |
0294b625 TH |
199 | int (*read_sock)(struct sock *sk, read_descriptor_t *desc, |
200 | sk_read_actor_t recv_actor); | |
306b13eb TH |
201 | int (*sendpage_locked)(struct sock *sk, struct page *page, |
202 | int offset, size_t size, int flags); | |
203 | int (*sendmsg_locked)(struct sock *sk, struct msghdr *msg, | |
204 | size_t size); | |
d1361840 | 205 | int (*set_rcvlowat)(struct sock *sk, int val); |
1da177e4 LT |
206 | }; |
207 | ||
38bfd8f5 CG |
208 | #define DECLARE_SOCKADDR(type, dst, src) \ |
209 | type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; }) | |
210 | ||
1da177e4 LT |
211 | struct net_proto_family { |
212 | int family; | |
3f378b68 EP |
213 | int (*create)(struct net *net, struct socket *sock, |
214 | int protocol, int kern); | |
1da177e4 LT |
215 | struct module *owner; |
216 | }; | |
217 | ||
218 | struct iovec; | |
219 | struct kvec; | |
220 | ||
8d8ad9d7 PE |
221 | enum { |
222 | SOCK_WAKE_IO, | |
223 | SOCK_WAKE_WAITD, | |
224 | SOCK_WAKE_SPACE, | |
225 | SOCK_WAKE_URG, | |
226 | }; | |
227 | ||
ceb5d58b | 228 | int sock_wake_async(struct socket_wq *sk_wq, int how, int band); |
7965bd4d JP |
229 | int sock_register(const struct net_proto_family *fam); |
230 | void sock_unregister(int family); | |
bf2ae2e4 | 231 | bool sock_is_registered(int family); |
7965bd4d JP |
232 | int __sock_create(struct net *net, int family, int type, int proto, |
233 | struct socket **res, int kern); | |
234 | int sock_create(int family, int type, int proto, struct socket **res); | |
eeb1bd5c | 235 | int sock_create_kern(struct net *net, int family, int type, int proto, struct socket **res); |
7965bd4d | 236 | int sock_create_lite(int family, int type, int proto, struct socket **res); |
f4a00aac | 237 | struct socket *sock_alloc(void); |
7965bd4d | 238 | void sock_release(struct socket *sock); |
d8725c86 | 239 | int sock_sendmsg(struct socket *sock, struct msghdr *msg); |
2da62906 | 240 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags); |
7965bd4d JP |
241 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname); |
242 | struct socket *sockfd_lookup(int fd, int *err); | |
243 | struct socket *sock_from_file(struct file *file, int *err); | |
1da177e4 | 244 | #define sockfd_put(sock) fput(sock->file) |
7965bd4d | 245 | int net_ratelimit(void); |
aaa248f6 | 246 | |
3a3bfb61 JP |
247 | #define net_ratelimited_function(function, ...) \ |
248 | do { \ | |
249 | if (net_ratelimit()) \ | |
250 | function(__VA_ARGS__); \ | |
251 | } while (0) | |
252 | ||
253 | #define net_emerg_ratelimited(fmt, ...) \ | |
254 | net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__) | |
255 | #define net_alert_ratelimited(fmt, ...) \ | |
256 | net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__) | |
257 | #define net_crit_ratelimited(fmt, ...) \ | |
258 | net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__) | |
259 | #define net_err_ratelimited(fmt, ...) \ | |
260 | net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__) | |
261 | #define net_notice_ratelimited(fmt, ...) \ | |
262 | net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__) | |
263 | #define net_warn_ratelimited(fmt, ...) \ | |
264 | net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__) | |
265 | #define net_info_ratelimited(fmt, ...) \ | |
266 | net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__) | |
2c94b537 TB |
267 | #if defined(CONFIG_DYNAMIC_DEBUG) |
268 | #define net_dbg_ratelimited(fmt, ...) \ | |
269 | do { \ | |
270 | DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ | |
3f16d181 | 271 | if (DYNAMIC_DEBUG_BRANCH(descriptor) && \ |
2c94b537 | 272 | net_ratelimit()) \ |
daddef76 JD |
273 | __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \ |
274 | ##__VA_ARGS__); \ | |
2c94b537 TB |
275 | } while (0) |
276 | #elif defined(DEBUG) | |
3a3bfb61 JP |
277 | #define net_dbg_ratelimited(fmt, ...) \ |
278 | net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__) | |
d92cff89 JD |
279 | #else |
280 | #define net_dbg_ratelimited(fmt, ...) \ | |
281 | do { \ | |
282 | if (0) \ | |
283 | no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \ | |
284 | } while (0) | |
285 | #endif | |
3a3bfb61 | 286 | |
46234253 HFS |
287 | #define net_get_random_once(buf, nbytes) \ |
288 | get_random_once((buf), (nbytes)) | |
da9ba564 JD |
289 | #define net_get_random_once_wait(buf, nbytes) \ |
290 | get_random_once_wait((buf), (nbytes)) | |
a48e4292 | 291 | |
7965bd4d JP |
292 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec, |
293 | size_t num, size_t len); | |
306b13eb TH |
294 | int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, |
295 | struct kvec *vec, size_t num, size_t len); | |
7965bd4d JP |
296 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec, |
297 | size_t num, size_t len, int flags); | |
1da177e4 | 298 | |
7965bd4d JP |
299 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen); |
300 | int kernel_listen(struct socket *sock, int backlog); | |
301 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags); | |
302 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
303 | int flags); | |
9b2c45d4 DV |
304 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr); |
305 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr); | |
7965bd4d JP |
306 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
307 | size_t size, int flags); | |
306b13eb TH |
308 | int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, |
309 | size_t size, int flags); | |
7965bd4d | 310 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how); |
ac5a488e | 311 | |
57240d00 | 312 | /* Routine returns the IP overhead imposed by a (caller-protected) socket. */ |
113c3075 P |
313 | u32 kernel_sock_ip_overhead(struct sock *sk); |
314 | ||
1da177e4 LT |
315 | #define MODULE_ALIAS_NETPROTO(proto) \ |
316 | MODULE_ALIAS("net-pf-" __stringify(proto)) | |
317 | ||
4fdb3bb7 HW |
318 | #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ |
319 | MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) | |
320 | ||
305e1e96 JD |
321 | #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ |
322 | MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ | |
323 | "-type-" __stringify(type)) | |
324 | ||
2033e9bf NH |
325 | #define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \ |
326 | MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ | |
327 | name) | |
1da177e4 | 328 | #endif /* _LINUX_NET_H */ |