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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/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 <linux/jump_label.h> | |
28 | #include <uapi/linux/net.h> | |
29 | ||
30 | struct poll_table_struct; | |
31 | struct pipe_inode_info; | |
32 | struct inode; | |
33 | struct file; | |
34 | struct net; | |
35 | ||
36 | #define SOCK_ASYNC_NOSPACE 0 | |
37 | #define SOCK_ASYNC_WAITDATA 1 | |
38 | #define SOCK_NOSPACE 2 | |
39 | #define SOCK_PASSCRED 3 | |
40 | #define SOCK_PASSSEC 4 | |
41 | #define SOCK_EXTERNALLY_ALLOCATED 5 | |
42 | ||
43 | #ifndef ARCH_HAS_SOCKET_TYPES | |
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 | |
51 | * @SOCK_DCCP: Datagram Congestion Control Protocol socket | |
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 | * | |
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. | |
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, | |
65 | SOCK_DCCP = 6, | |
66 | SOCK_PACKET = 10, | |
67 | }; | |
68 | ||
69 | #define SOCK_MAX (SOCK_PACKET + 1) | |
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 | ||
74 | /* Flags for socket, socketpair, accept4 */ | |
75 | #define SOCK_CLOEXEC O_CLOEXEC | |
76 | #ifndef SOCK_NONBLOCK | |
77 | #define SOCK_NONBLOCK O_NONBLOCK | |
78 | #endif | |
79 | ||
80 | #endif /* ARCH_HAS_SOCKET_TYPES */ | |
81 | ||
82 | enum sock_shutdown_cmd { | |
83 | SHUT_RD, | |
84 | SHUT_WR, | |
85 | SHUT_RDWR, | |
86 | }; | |
87 | ||
88 | struct socket_wq { | |
89 | /* Note: wait MUST be first field of socket_wq */ | |
90 | wait_queue_head_t wait; | |
91 | struct fasync_struct *fasync_list; | |
92 | struct rcu_head rcu; | |
93 | } ____cacheline_aligned_in_smp; | |
94 | ||
95 | /** | |
96 | * struct socket - general BSD socket | |
97 | * @state: socket state (%SS_CONNECTED, etc) | |
98 | * @type: socket type (%SOCK_STREAM, etc) | |
99 | * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) | |
100 | * @ops: protocol specific socket operations | |
101 | * @file: File back pointer for gc | |
102 | * @sk: internal networking protocol agnostic socket representation | |
103 | * @wq: wait queue for several uses | |
104 | */ | |
105 | struct socket { | |
106 | socket_state state; | |
107 | ||
108 | kmemcheck_bitfield_begin(type); | |
109 | short type; | |
110 | kmemcheck_bitfield_end(type); | |
111 | ||
112 | unsigned long flags; | |
113 | ||
114 | struct socket_wq __rcu *wq; | |
115 | ||
116 | struct file *file; | |
117 | struct sock *sk; | |
118 | const struct proto_ops *ops; | |
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); | |
149 | #ifdef CONFIG_COMPAT | |
150 | int (*compat_ioctl) (struct socket *sock, unsigned int cmd, | |
151 | unsigned long arg); | |
152 | #endif | |
153 | int (*listen) (struct socket *sock, int len); | |
154 | int (*shutdown) (struct socket *sock, int flags); | |
155 | int (*setsockopt)(struct socket *sock, int level, | |
156 | int optname, char __user *optval, unsigned int optlen); | |
157 | int (*getsockopt)(struct socket *sock, int level, | |
158 | int optname, char __user *optval, int __user *optlen); | |
159 | #ifdef CONFIG_COMPAT | |
160 | int (*compat_setsockopt)(struct socket *sock, int level, | |
161 | int optname, char __user *optval, unsigned int optlen); | |
162 | int (*compat_getsockopt)(struct socket *sock, int level, | |
163 | int optname, char __user *optval, int __user *optlen); | |
164 | #endif | |
165 | int (*sendmsg) (struct kiocb *iocb, struct socket *sock, | |
166 | struct msghdr *m, size_t total_len); | |
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 | */ | |
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); | |
182 | ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, | |
183 | struct pipe_inode_info *pipe, size_t len, unsigned int flags); | |
184 | int (*set_peek_off)(struct sock *sk, int val); | |
185 | }; | |
186 | ||
187 | #define DECLARE_SOCKADDR(type, dst, src) \ | |
188 | type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; }) | |
189 | ||
190 | struct net_proto_family { | |
191 | int family; | |
192 | int (*create)(struct net *net, struct socket *sock, | |
193 | int protocol, int kern); | |
194 | struct module *owner; | |
195 | }; | |
196 | ||
197 | struct iovec; | |
198 | struct kvec; | |
199 | ||
200 | enum { | |
201 | SOCK_WAKE_IO, | |
202 | SOCK_WAKE_WAITD, | |
203 | SOCK_WAKE_SPACE, | |
204 | SOCK_WAKE_URG, | |
205 | }; | |
206 | ||
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); | |
222 | #define sockfd_put(sock) fput(sock->file) | |
223 | int net_ratelimit(void); | |
224 | ||
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 | ||
248 | bool __net_get_random_once(void *buf, int nbytes, bool *done, | |
249 | struct static_key *done_key); | |
250 | ||
251 | #define net_get_random_once(buf, nbytes) \ | |
252 | ({ \ | |
253 | bool ___ret = false; \ | |
254 | static bool ___done = false; \ | |
255 | static struct static_key ___once_key = \ | |
256 | STATIC_KEY_INIT_TRUE; \ | |
257 | if (static_key_true(&___once_key)) \ | |
258 | ___ret = __net_get_random_once(buf, \ | |
259 | nbytes, \ | |
260 | &___done, \ | |
261 | &___once_key); \ | |
262 | ___ret; \ | |
263 | }) | |
264 | ||
265 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec, | |
266 | size_t num, size_t len); | |
267 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec, | |
268 | size_t num, size_t len, int flags); | |
269 | ||
270 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen); | |
271 | int kernel_listen(struct socket *sock, int backlog); | |
272 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags); | |
273 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
274 | int flags); | |
275 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
276 | int *addrlen); | |
277 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
278 | int *addrlen); | |
279 | int kernel_getsockopt(struct socket *sock, int level, int optname, char *optval, | |
280 | int *optlen); | |
281 | int kernel_setsockopt(struct socket *sock, int level, int optname, char *optval, | |
282 | unsigned int optlen); | |
283 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
284 | size_t size, int flags); | |
285 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); | |
286 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how); | |
287 | ||
288 | #define MODULE_ALIAS_NETPROTO(proto) \ | |
289 | MODULE_ALIAS("net-pf-" __stringify(proto)) | |
290 | ||
291 | #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ | |
292 | MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) | |
293 | ||
294 | #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ | |
295 | MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ | |
296 | "-type-" __stringify(type)) | |
297 | ||
298 | #define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \ | |
299 | MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ | |
300 | name) | |
301 | #endif /* _LINUX_NET_H */ |