projects/linux·blob v6.5-rc3 · refs

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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_SOCKET_H
3#define _LINUX_SOCKET_H
4
5
6#include <asm/socket.h> /* arch-dependent defines */
7#include <linux/sockios.h> /* the SIOCxxx I/O controls */
8#include <linux/uio.h> /* iovec support */
9#include <linux/types.h> /* pid_t */
10#include <linux/compiler.h> /* __user */
11#include <uapi/linux/socket.h>
12
13struct file;
14struct pid;
15struct cred;
16struct socket;
17struct sock;
18struct sk_buff;
19
20#define __sockaddr_check_size(size) \
21 BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))
22
23#ifdef CONFIG_PROC_FS
24struct seq_file;
25extern void socket_seq_show(struct seq_file *seq);
26#endif
27
28typedef __kernel_sa_family_t sa_family_t;
29
30/*
31 * 1003.1g requires sa_family_t and that sa_data is char.
32 */
33
34struct sockaddr {
35 sa_family_t sa_family; /* address family, AF_xxx */
36 union {
37 char sa_data_min[14]; /* Minimum 14 bytes of protocol address */
38 DECLARE_FLEX_ARRAY(char, sa_data);
39 };
40};
41
42struct linger {
43 int l_onoff; /* Linger active */
44 int l_linger; /* How long to linger for */
45};
46
47#define sockaddr_storage __kernel_sockaddr_storage
48
49/*
50 * As we do 4.4BSD message passing we use a 4.4BSD message passing
51 * system, not 4.3. Thus msg_accrights(len) are now missing. They
52 * belong in an obscure libc emulation or the bin.
53 */
54
55struct msghdr {
56 void *msg_name; /* ptr to socket address structure */
57 int msg_namelen; /* size of socket address structure */
58
59 int msg_inq; /* output, data left in socket */
60
61 struct iov_iter msg_iter; /* data */
62
63 /*
64 * Ancillary data. msg_control_user is the user buffer used for the
65 * recv* side when msg_control_is_user is set, msg_control is the kernel
66 * buffer used for all other cases.
67 */
68 union {
69 void *msg_control;
70 void __user *msg_control_user;
71 };
72 bool msg_control_is_user : 1;
73 bool msg_get_inq : 1;/* return INQ after receive */
74 unsigned int msg_flags; /* flags on received message */
75 __kernel_size_t msg_controllen; /* ancillary data buffer length */
76 struct kiocb *msg_iocb; /* ptr to iocb for async requests */
77 struct ubuf_info *msg_ubuf;
78 int (*sg_from_iter)(struct sock *sk, struct sk_buff *skb,
79 struct iov_iter *from, size_t length);
80};
81
82struct user_msghdr {
83 void __user *msg_name; /* ptr to socket address structure */
84 int msg_namelen; /* size of socket address structure */
85 struct iovec __user *msg_iov; /* scatter/gather array */
86 __kernel_size_t msg_iovlen; /* # elements in msg_iov */
87 void __user *msg_control; /* ancillary data */
88 __kernel_size_t msg_controllen; /* ancillary data buffer length */
89 unsigned int msg_flags; /* flags on received message */
90};
91
92/* For recvmmsg/sendmmsg */
93struct mmsghdr {
94 struct user_msghdr msg_hdr;
95 unsigned int msg_len;
96};
97
98/*
99 * POSIX 1003.1g - ancillary data object information
100 * Ancillary data consists of a sequence of pairs of
101 * (cmsghdr, cmsg_data[])
102 */
103
104struct cmsghdr {
105 __kernel_size_t cmsg_len; /* data byte count, including hdr */
106 int cmsg_level; /* originating protocol */
107 int cmsg_type; /* protocol-specific type */
108};
109
110/*
111 * Ancillary data object information MACROS
112 * Table 5-14 of POSIX 1003.1g
113 */
114
115#define __CMSG_NXTHDR(ctl, len, cmsg) __cmsg_nxthdr((ctl),(len),(cmsg))
116#define CMSG_NXTHDR(mhdr, cmsg) cmsg_nxthdr((mhdr), (cmsg))
117
118#define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )
119
120#define CMSG_DATA(cmsg) \
121 ((void *)(cmsg) + sizeof(struct cmsghdr))
122#define CMSG_USER_DATA(cmsg) \
123 ((void __user *)(cmsg) + sizeof(struct cmsghdr))
124#define CMSG_SPACE(len) (sizeof(struct cmsghdr) + CMSG_ALIGN(len))
125#define CMSG_LEN(len) (sizeof(struct cmsghdr) + (len))
126
127#define __CMSG_FIRSTHDR(ctl,len) ((len) >= sizeof(struct cmsghdr) ? \
128 (struct cmsghdr *)(ctl) : \
129 (struct cmsghdr *)NULL)
130#define CMSG_FIRSTHDR(msg) __CMSG_FIRSTHDR((msg)->msg_control, (msg)->msg_controllen)
131#define CMSG_OK(mhdr, cmsg) ((cmsg)->cmsg_len >= sizeof(struct cmsghdr) && \
132 (cmsg)->cmsg_len <= (unsigned long) \
133 ((mhdr)->msg_controllen - \
134 ((char *)(cmsg) - (char *)(mhdr)->msg_control)))
135#define for_each_cmsghdr(cmsg, msg) \
136 for (cmsg = CMSG_FIRSTHDR(msg); \
137 cmsg; \
138 cmsg = CMSG_NXTHDR(msg, cmsg))
139
140/*
141 * Get the next cmsg header
142 *
143 * PLEASE, do not touch this function. If you think, that it is
144 * incorrect, grep kernel sources and think about consequences
145 * before trying to improve it.
146 *
147 * Now it always returns valid, not truncated ancillary object
148 * HEADER. But caller still MUST check, that cmsg->cmsg_len is
149 * inside range, given by msg->msg_controllen before using
150 * ancillary object DATA. --ANK (980731)
151 */
152
153static inline struct cmsghdr * __cmsg_nxthdr(void *__ctl, __kernel_size_t __size,
154 struct cmsghdr *__cmsg)
155{
156 struct cmsghdr * __ptr;
157
158 __ptr = (struct cmsghdr*)(((unsigned char *) __cmsg) + CMSG_ALIGN(__cmsg->cmsg_len));
159 if ((unsigned long)((char*)(__ptr+1) - (char *) __ctl) > __size)
160 return (struct cmsghdr *)0;
161
162 return __ptr;
163}
164
165static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr *__cmsg)
166{
167 return __cmsg_nxthdr(__msg->msg_control, __msg->msg_controllen, __cmsg);
168}
169
170static inline size_t msg_data_left(struct msghdr *msg)
171{
172 return iov_iter_count(&msg->msg_iter);
173}
174
175/* "Socket"-level control message types: */
176
177#define SCM_RIGHTS 0x01 /* rw: access rights (array of int) */
178#define SCM_CREDENTIALS 0x02 /* rw: struct ucred */
179#define SCM_SECURITY 0x03 /* rw: security label */
180#define SCM_PIDFD 0x04 /* ro: pidfd (int) */
181
182struct ucred {
183 __u32 pid;
184 __u32 uid;
185 __u32 gid;
186};
187
188/* Supported address families. */
189#define AF_UNSPEC 0
190#define AF_UNIX 1 /* Unix domain sockets */
191#define AF_LOCAL 1 /* POSIX name for AF_UNIX */
192#define AF_INET 2 /* Internet IP Protocol */
193#define AF_AX25 3 /* Amateur Radio AX.25 */
194#define AF_IPX 4 /* Novell IPX */
195#define AF_APPLETALK 5 /* AppleTalk DDP */
196#define AF_NETROM 6 /* Amateur Radio NET/ROM */
197#define AF_BRIDGE 7 /* Multiprotocol bridge */
198#define AF_ATMPVC 8 /* ATM PVCs */
199#define AF_X25 9 /* Reserved for X.25 project */
200#define AF_INET6 10 /* IP version 6 */
201#define AF_ROSE 11 /* Amateur Radio X.25 PLP */
202#define AF_DECnet 12 /* Reserved for DECnet project */
203#define AF_NETBEUI 13 /* Reserved for 802.2LLC project*/
204#define AF_SECURITY 14 /* Security callback pseudo AF */
205#define AF_KEY 15 /* PF_KEY key management API */
206#define AF_NETLINK 16
207#define AF_ROUTE AF_NETLINK /* Alias to emulate 4.4BSD */
208#define AF_PACKET 17 /* Packet family */
209#define AF_ASH 18 /* Ash */
210#define AF_ECONET 19 /* Acorn Econet */
211#define AF_ATMSVC 20 /* ATM SVCs */
212#define AF_RDS 21 /* RDS sockets */
213#define AF_SNA 22 /* Linux SNA Project (nutters!) */
214#define AF_IRDA 23 /* IRDA sockets */
215#define AF_PPPOX 24 /* PPPoX sockets */
216#define AF_WANPIPE 25 /* Wanpipe API Sockets */
217#define AF_LLC 26 /* Linux LLC */
218#define AF_IB 27 /* Native InfiniBand address */
219#define AF_MPLS 28 /* MPLS */
220#define AF_CAN 29 /* Controller Area Network */
221#define AF_TIPC 30 /* TIPC sockets */
222#define AF_BLUETOOTH 31 /* Bluetooth sockets */
223#define AF_IUCV 32 /* IUCV sockets */
224#define AF_RXRPC 33 /* RxRPC sockets */
225#define AF_ISDN 34 /* mISDN sockets */
226#define AF_PHONET 35 /* Phonet sockets */
227#define AF_IEEE802154 36 /* IEEE802154 sockets */
228#define AF_CAIF 37 /* CAIF sockets */
229#define AF_ALG 38 /* Algorithm sockets */
230#define AF_NFC 39 /* NFC sockets */
231#define AF_VSOCK 40 /* vSockets */
232#define AF_KCM 41 /* Kernel Connection Multiplexor*/
233#define AF_QIPCRTR 42 /* Qualcomm IPC Router */
234#define AF_SMC 43 /* smc sockets: reserve number for
235 * PF_SMC protocol family that
236 * reuses AF_INET address family
237 */
238#define AF_XDP 44 /* XDP sockets */
239#define AF_MCTP 45 /* Management component
240 * transport protocol
241 */
242
243#define AF_MAX 46 /* For now.. */
244
245/* Protocol families, same as address families. */
246#define PF_UNSPEC AF_UNSPEC
247#define PF_UNIX AF_UNIX
248#define PF_LOCAL AF_LOCAL
249#define PF_INET AF_INET
250#define PF_AX25 AF_AX25
251#define PF_IPX AF_IPX
252#define PF_APPLETALK AF_APPLETALK
253#define PF_NETROM AF_NETROM
254#define PF_BRIDGE AF_BRIDGE
255#define PF_ATMPVC AF_ATMPVC
256#define PF_X25 AF_X25
257#define PF_INET6 AF_INET6
258#define PF_ROSE AF_ROSE
259#define PF_DECnet AF_DECnet
260#define PF_NETBEUI AF_NETBEUI
261#define PF_SECURITY AF_SECURITY
262#define PF_KEY AF_KEY
263#define PF_NETLINK AF_NETLINK
264#define PF_ROUTE AF_ROUTE
265#define PF_PACKET AF_PACKET
266#define PF_ASH AF_ASH
267#define PF_ECONET AF_ECONET
268#define PF_ATMSVC AF_ATMSVC
269#define PF_RDS AF_RDS
270#define PF_SNA AF_SNA
271#define PF_IRDA AF_IRDA
272#define PF_PPPOX AF_PPPOX
273#define PF_WANPIPE AF_WANPIPE
274#define PF_LLC AF_LLC
275#define PF_IB AF_IB
276#define PF_MPLS AF_MPLS
277#define PF_CAN AF_CAN
278#define PF_TIPC AF_TIPC
279#define PF_BLUETOOTH AF_BLUETOOTH
280#define PF_IUCV AF_IUCV
281#define PF_RXRPC AF_RXRPC
282#define PF_ISDN AF_ISDN
283#define PF_PHONET AF_PHONET
284#define PF_IEEE802154 AF_IEEE802154
285#define PF_CAIF AF_CAIF
286#define PF_ALG AF_ALG
287#define PF_NFC AF_NFC
288#define PF_VSOCK AF_VSOCK
289#define PF_KCM AF_KCM
290#define PF_QIPCRTR AF_QIPCRTR
291#define PF_SMC AF_SMC
292#define PF_XDP AF_XDP
293#define PF_MCTP AF_MCTP
294#define PF_MAX AF_MAX
295
296/* Maximum queue length specifiable by listen. */
297#define SOMAXCONN 4096
298
299/* Flags we can use with send/ and recv.
300 Added those for 1003.1g not all are supported yet
301 */
302
303#define MSG_OOB 1
304#define MSG_PEEK 2
305#define MSG_DONTROUTE 4
306#define MSG_TRYHARD 4 /* Synonym for MSG_DONTROUTE for DECnet */
307#define MSG_CTRUNC 8
308#define MSG_PROBE 0x10 /* Do not send. Only probe path f.e. for MTU */
309#define MSG_TRUNC 0x20
310#define MSG_DONTWAIT 0x40 /* Nonblocking io */
311#define MSG_EOR 0x80 /* End of record */
312#define MSG_WAITALL 0x100 /* Wait for a full request */
313#define MSG_FIN 0x200
314#define MSG_SYN 0x400
315#define MSG_CONFIRM 0x800 /* Confirm path validity */
316#define MSG_RST 0x1000
317#define MSG_ERRQUEUE 0x2000 /* Fetch message from error queue */
318#define MSG_NOSIGNAL 0x4000 /* Do not generate SIGPIPE */
319#define MSG_MORE 0x8000 /* Sender will send more */
320#define MSG_WAITFORONE 0x10000 /* recvmmsg(): block until 1+ packets avail */
321#define MSG_SENDPAGE_NOPOLICY 0x10000 /* sendpage() internal : do no apply policy */
322#define MSG_BATCH 0x40000 /* sendmmsg(): more messages coming */
323#define MSG_EOF MSG_FIN
324#define MSG_NO_SHARED_FRAGS 0x80000 /* sendpage() internal : page frags are not shared */
325#define MSG_SENDPAGE_DECRYPTED 0x100000 /* sendpage() internal : page may carry
326 * plain text and require encryption
327 */
328
329#define MSG_ZEROCOPY 0x4000000 /* Use user data in kernel path */
330#define MSG_SPLICE_PAGES 0x8000000 /* Splice the pages from the iterator in sendmsg() */
331#define MSG_FASTOPEN 0x20000000 /* Send data in TCP SYN */
332#define MSG_CMSG_CLOEXEC 0x40000000 /* Set close_on_exec for file
333 descriptor received through
334 SCM_RIGHTS */
335#if defined(CONFIG_COMPAT)
336#define MSG_CMSG_COMPAT 0x80000000 /* This message needs 32 bit fixups */
337#else
338#define MSG_CMSG_COMPAT 0 /* We never have 32 bit fixups */
339#endif
340
341/* Flags to be cleared on entry by sendmsg and sendmmsg syscalls */
342#define MSG_INTERNAL_SENDMSG_FLAGS \
343 (MSG_SPLICE_PAGES | MSG_SENDPAGE_NOPOLICY | MSG_SENDPAGE_DECRYPTED)
344
345/* Setsockoptions(2) level. Thanks to BSD these must match IPPROTO_xxx */
346#define SOL_IP 0
347/* #define SOL_ICMP 1 No-no-no! Due to Linux :-) we cannot use SOL_ICMP=1 */
348#define SOL_TCP 6
349#define SOL_UDP 17
350#define SOL_IPV6 41
351#define SOL_ICMPV6 58
352#define SOL_SCTP 132
353#define SOL_UDPLITE 136 /* UDP-Lite (RFC 3828) */
354#define SOL_RAW 255
355#define SOL_IPX 256
356#define SOL_AX25 257
357#define SOL_ATALK 258
358#define SOL_NETROM 259
359#define SOL_ROSE 260
360#define SOL_DECNET 261
361#define SOL_X25 262
362#define SOL_PACKET 263
363#define SOL_ATM 264 /* ATM layer (cell level) */
364#define SOL_AAL 265 /* ATM Adaption Layer (packet level) */
365#define SOL_IRDA 266
366#define SOL_NETBEUI 267
367#define SOL_LLC 268
368#define SOL_DCCP 269
369#define SOL_NETLINK 270
370#define SOL_TIPC 271
371#define SOL_RXRPC 272
372#define SOL_PPPOL2TP 273
373#define SOL_BLUETOOTH 274
374#define SOL_PNPIPE 275
375#define SOL_RDS 276
376#define SOL_IUCV 277
377#define SOL_CAIF 278
378#define SOL_ALG 279
379#define SOL_NFC 280
380#define SOL_KCM 281
381#define SOL_TLS 282
382#define SOL_XDP 283
383#define SOL_MPTCP 284
384#define SOL_MCTP 285
385#define SOL_SMC 286
386
387/* IPX options */
388#define IPX_TYPE 1
389
390extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
391extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
392
393struct timespec64;
394struct __kernel_timespec;
395struct old_timespec32;
396
397struct scm_timestamping_internal {
398 struct timespec64 ts[3];
399};
400
401extern void put_cmsg_scm_timestamping64(struct msghdr *msg, struct scm_timestamping_internal *tss);
402extern void put_cmsg_scm_timestamping(struct msghdr *msg, struct scm_timestamping_internal *tss);
403
404/* The __sys_...msg variants allow MSG_CMSG_COMPAT iff
405 * forbid_cmsg_compat==false
406 */
407extern long __sys_recvmsg(int fd, struct user_msghdr __user *msg,
408 unsigned int flags, bool forbid_cmsg_compat);
409extern long __sys_sendmsg(int fd, struct user_msghdr __user *msg,
410 unsigned int flags, bool forbid_cmsg_compat);
411extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
412 unsigned int vlen, unsigned int flags,
413 struct __kernel_timespec __user *timeout,
414 struct old_timespec32 __user *timeout32);
415extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,
416 unsigned int vlen, unsigned int flags,
417 bool forbid_cmsg_compat);
418extern long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
419 unsigned int flags);
420extern long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,
421 struct user_msghdr __user *umsg,
422 struct sockaddr __user *uaddr,
423 unsigned int flags);
424extern int sendmsg_copy_msghdr(struct msghdr *msg,
425 struct user_msghdr __user *umsg, unsigned flags,
426 struct iovec **iov);
427extern int recvmsg_copy_msghdr(struct msghdr *msg,
428 struct user_msghdr __user *umsg, unsigned flags,
429 struct sockaddr __user **uaddr,
430 struct iovec **iov);
431extern int __copy_msghdr(struct msghdr *kmsg,
432 struct user_msghdr *umsg,
433 struct sockaddr __user **save_addr);
434
435/* helpers which do the actual work for syscalls */
436extern int __sys_recvfrom(int fd, void __user *ubuf, size_t size,
437 unsigned int flags, struct sockaddr __user *addr,
438 int __user *addr_len);
439extern int __sys_sendto(int fd, void __user *buff, size_t len,
440 unsigned int flags, struct sockaddr __user *addr,
441 int addr_len);
442extern struct file *do_accept(struct file *file, unsigned file_flags,
443 struct sockaddr __user *upeer_sockaddr,
444 int __user *upeer_addrlen, int flags);
445extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
446 int __user *upeer_addrlen, int flags);
447extern int __sys_socket(int family, int type, int protocol);
448extern struct file *__sys_socket_file(int family, int type, int protocol);
449extern int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen);
450extern int __sys_connect_file(struct file *file, struct sockaddr_storage *addr,
451 int addrlen, int file_flags);
452extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,
453 int addrlen);
454extern int __sys_listen(int fd, int backlog);
455extern int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
456 int __user *usockaddr_len);
457extern int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
458 int __user *usockaddr_len);
459extern int __sys_socketpair(int family, int type, int protocol,
460 int __user *usockvec);
461extern int __sys_shutdown_sock(struct socket *sock, int how);
462extern int __sys_shutdown(int fd, int how);
463#endif /* _LINUX_SOCKET_H */