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1/* SPDX-License-Identifier: GPL-2.0-or-later */
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>
11 * Ross Biro
12 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13 */
14#ifndef _LINUX_NET_H
15#define _LINUX_NET_H
16
17#include <linux/stringify.h>
18#include <linux/random.h>
19#include <linux/wait.h>
20#include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */
21#include <linux/rcupdate.h>
22#include <linux/once.h>
23#include <linux/fs.h>
24
25#include <uapi/linux/net.h>
26
27struct poll_table_struct;
28struct pipe_inode_info;
29struct inode;
30struct file;
31struct net;
32
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.
35 * Eventually all flags will be in sk->sk_wq->flags.
36 */
37#define SOCKWQ_ASYNC_NOSPACE 0
38#define SOCKWQ_ASYNC_WAITDATA 1
39#define SOCK_NOSPACE 2
40#define SOCK_PASSCRED 3
41#define SOCK_PASSSEC 4
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 */
59enum 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/**
83 * enum sock_shutdown_cmd - Shutdown types
84 * @SHUT_RD: shutdown receptions
85 * @SHUT_WR: shutdown transmissions
86 * @SHUT_RDWR: shutdown receptions/transmissions
87 */
88enum sock_shutdown_cmd {
89 SHUT_RD,
90 SHUT_WR,
91 SHUT_RDWR,
92};
93
94struct socket_wq {
95 /* Note: wait MUST be first field of socket_wq */
96 wait_queue_head_t wait;
97 struct fasync_struct *fasync_list;
98 unsigned long flags; /* %SOCKWQ_ASYNC_NOSPACE, etc */
99 struct rcu_head rcu;
100} ____cacheline_aligned_in_smp;
101
102/**
103 * struct socket - general BSD socket
104 * @state: socket state (%SS_CONNECTED, etc)
105 * @type: socket type (%SOCK_STREAM, etc)
106 * @flags: socket flags (%SOCK_NOSPACE, etc)
107 * @ops: protocol specific socket operations
108 * @file: File back pointer for gc
109 * @sk: internal networking protocol agnostic socket representation
110 * @wq: wait queue for several uses
111 */
112struct socket {
113 socket_state state;
114
115 short type;
116
117 unsigned long flags;
118
119 struct file *file;
120 struct sock *sk;
121 const struct proto_ops *ops;
122
123 struct socket_wq wq;
124};
125
126struct vm_area_struct;
127struct page;
128struct sockaddr;
129struct msghdr;
130struct module;
131struct sk_buff;
132typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *,
133 unsigned int, size_t);
134
135struct 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,
148 struct socket *newsock, int flags, bool kern);
149 int (*getname) (struct socket *sock,
150 struct sockaddr *addr,
151 int peer);
152 __poll_t (*poll) (struct file *file, struct socket *sock,
153 struct poll_table_struct *wait);
154 int (*ioctl) (struct socket *sock, unsigned int cmd,
155 unsigned long arg);
156#ifdef CONFIG_COMPAT
157 int (*compat_ioctl) (struct socket *sock, unsigned int cmd,
158 unsigned long arg);
159#endif
160 int (*gettstamp) (struct socket *sock, void __user *userstamp,
161 bool timeval, bool time32);
162 int (*listen) (struct socket *sock, int len);
163 int (*shutdown) (struct socket *sock, int flags);
164 int (*setsockopt)(struct socket *sock, int level,
165 int optname, char __user *optval, unsigned int optlen);
166 int (*getsockopt)(struct socket *sock, int level,
167 int optname, char __user *optval, int __user *optlen);
168#ifdef CONFIG_COMPAT
169 int (*compat_setsockopt)(struct socket *sock, int level,
170 int optname, char __user *optval, unsigned int optlen);
171 int (*compat_getsockopt)(struct socket *sock, int level,
172 int optname, char __user *optval, int __user *optlen);
173#endif
174 void (*show_fdinfo)(struct seq_file *m, struct socket *sock);
175 int (*sendmsg) (struct socket *sock, struct msghdr *m,
176 size_t total_len);
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 */
185 int (*recvmsg) (struct socket *sock, struct msghdr *m,
186 size_t total_len, int flags);
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);
191 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
192 struct pipe_inode_info *pipe, size_t len, unsigned int flags);
193 int (*set_peek_off)(struct sock *sk, int val);
194 int (*peek_len)(struct socket *sock);
195
196 /* The following functions are called internally by kernel with
197 * sock lock already held.
198 */
199 int (*read_sock)(struct sock *sk, read_descriptor_t *desc,
200 sk_read_actor_t recv_actor);
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);
205 int (*set_rcvlowat)(struct sock *sk, int val);
206};
207
208#define DECLARE_SOCKADDR(type, dst, src) \
209 type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
210
211struct net_proto_family {
212 int family;
213 int (*create)(struct net *net, struct socket *sock,
214 int protocol, int kern);
215 struct module *owner;
216};
217
218struct iovec;
219struct kvec;
220
221enum {
222 SOCK_WAKE_IO,
223 SOCK_WAKE_WAITD,
224 SOCK_WAKE_SPACE,
225 SOCK_WAKE_URG,
226};
227
228int sock_wake_async(struct socket_wq *sk_wq, int how, int band);
229int sock_register(const struct net_proto_family *fam);
230void sock_unregister(int family);
231bool sock_is_registered(int family);
232int __sock_create(struct net *net, int family, int type, int proto,
233 struct socket **res, int kern);
234int sock_create(int family, int type, int proto, struct socket **res);
235int sock_create_kern(struct net *net, int family, int type, int proto, struct socket **res);
236int sock_create_lite(int family, int type, int proto, struct socket **res);
237struct socket *sock_alloc(void);
238void sock_release(struct socket *sock);
239int sock_sendmsg(struct socket *sock, struct msghdr *msg);
240int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags);
241struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname);
242struct socket *sockfd_lookup(int fd, int *err);
243struct socket *sock_from_file(struct file *file, int *err);
244#define sockfd_put(sock) fput(sock->file)
245int net_ratelimit(void);
246
247#define net_ratelimited_function(function, ...) \
248do { \
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__)
267#if defined(CONFIG_DYNAMIC_DEBUG)
268#define net_dbg_ratelimited(fmt, ...) \
269do { \
270 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
271 if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
272 net_ratelimit()) \
273 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
274 ##__VA_ARGS__); \
275} while (0)
276#elif defined(DEBUG)
277#define net_dbg_ratelimited(fmt, ...) \
278 net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
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
286
287#define net_get_random_once(buf, nbytes) \
288 get_random_once((buf), (nbytes))
289#define net_get_random_once_wait(buf, nbytes) \
290 get_random_once_wait((buf), (nbytes))
291
292int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
293 size_t num, size_t len);
294int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
295 struct kvec *vec, size_t num, size_t len);
296int kernel_recvmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
297 size_t num, size_t len, int flags);
298
299int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen);
300int kernel_listen(struct socket *sock, int backlog);
301int kernel_accept(struct socket *sock, struct socket **newsock, int flags);
302int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
303 int flags);
304int kernel_getsockname(struct socket *sock, struct sockaddr *addr);
305int kernel_getpeername(struct socket *sock, struct sockaddr *addr);
306int kernel_getsockopt(struct socket *sock, int level, int optname, char *optval,
307 int *optlen);
308int kernel_setsockopt(struct socket *sock, int level, int optname, char *optval,
309 unsigned int optlen);
310int kernel_sendpage(struct socket *sock, struct page *page, int offset,
311 size_t size, int flags);
312int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
313 size_t size, int flags);
314int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how);
315
316/* Routine returns the IP overhead imposed by a (caller-protected) socket. */
317u32 kernel_sock_ip_overhead(struct sock *sk);
318
319#define MODULE_ALIAS_NETPROTO(proto) \
320 MODULE_ALIAS("net-pf-" __stringify(proto))
321
322#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
323 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
324
325#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
326 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
327 "-type-" __stringify(type))
328
329#define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
330 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
331 name)
332#endif /* _LINUX_NET_H */