1/* System-specific socket constants and types. Linux version.
2 Copyright (C) 1991-2026 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef __BITS_SOCKET_H
20#define __BITS_SOCKET_H
21
22#ifndef _SYS_SOCKET_H
23# error "Never include <bits/socket.h> directly; use <sys/socket.h> instead."
24#endif
25
26#define __need_size_t
27#include <stddef.h>
28
29#include <sys/types.h>
30
31/* Type for length arguments in socket calls. */
32#ifndef __socklen_t_defined
33typedef __socklen_t socklen_t;
34# define __socklen_t_defined
35#endif
36
37/* Get the architecture-dependent definition of enum __socket_type. */
38#include <bits/socket_type.h>
39
40/* Protocol families. */
41#define PF_UNSPEC 0 /* Unspecified. */
42#define PF_LOCAL 1 /* Local to host (pipes and file-domain). */
43#define PF_UNIX PF_LOCAL /* POSIX name for PF_LOCAL. */
44#define PF_FILE PF_LOCAL /* Another non-standard name for PF_LOCAL. */
45#define PF_INET 2 /* IP protocol family. */
46#define PF_AX25 3 /* Amateur Radio AX.25. */
47#define PF_IPX 4 /* Novell Internet Protocol. */
48#define PF_APPLETALK 5 /* Appletalk DDP. */
49#define PF_NETROM 6 /* Amateur radio NetROM. */
50#define PF_BRIDGE 7 /* Multiprotocol bridge. */
51#define PF_ATMPVC 8 /* ATM PVCs. */
52#define PF_X25 9 /* Reserved for X.25 project. */
53#define PF_INET6 10 /* IP version 6. */
54#define PF_ROSE 11 /* Amateur Radio X.25 PLP. */
55#define PF_DECnet 12 /* Reserved for DECnet project. */
56#define PF_NETBEUI 13 /* Reserved for 802.2LLC project. */
57#define PF_SECURITY 14 /* Security callback pseudo AF. */
58#define PF_KEY 15 /* PF_KEY key management API. */
59#define PF_NETLINK 16
60#define PF_ROUTE PF_NETLINK /* Alias to emulate 4.4BSD. */
61#define PF_PACKET 17 /* Packet family. */
62#define PF_ASH 18 /* Ash. */
63#define PF_ECONET 19 /* Acorn Econet. */
64#define PF_ATMSVC 20 /* ATM SVCs. */
65#define PF_RDS 21 /* RDS sockets. */
66#define PF_SNA 22 /* Linux SNA Project */
67#define PF_IRDA 23 /* IRDA sockets. */
68#define PF_PPPOX 24 /* PPPoX sockets. */
69#define PF_WANPIPE 25 /* Wanpipe API sockets. */
70#define PF_LLC 26 /* Linux LLC. */
71#define PF_IB 27 /* Native InfiniBand address. */
72#define PF_MPLS 28 /* MPLS. */
73#define PF_CAN 29 /* Controller Area Network. */
74#define PF_TIPC 30 /* TIPC sockets. */
75#define PF_BLUETOOTH 31 /* Bluetooth sockets. */
76#define PF_IUCV 32 /* IUCV sockets. */
77#define PF_RXRPC 33 /* RxRPC sockets. */
78#define PF_ISDN 34 /* mISDN sockets. */
79#define PF_PHONET 35 /* Phonet sockets. */
80#define PF_IEEE802154 36 /* IEEE 802.15.4 sockets. */
81#define PF_CAIF 37 /* CAIF sockets. */
82#define PF_ALG 38 /* Algorithm sockets. */
83#define PF_NFC 39 /* NFC sockets. */
84#define PF_VSOCK 40 /* vSockets. */
85#define PF_KCM 41 /* Kernel Connection Multiplexor. */
86#define PF_QIPCRTR 42 /* Qualcomm IPC Router. */
87#define PF_SMC 43 /* SMC sockets. */
88#define PF_XDP 44 /* XDP sockets. */
89#define PF_MCTP 45 /* Management component transport protocol. */
90#define PF_MAX 46 /* For now.. */
91
92/* Address families. */
93#define AF_UNSPEC PF_UNSPEC
94#define AF_LOCAL PF_LOCAL
95#define AF_UNIX PF_UNIX
96#define AF_FILE PF_FILE
97#define AF_INET PF_INET
98#define AF_AX25 PF_AX25
99#define AF_IPX PF_IPX
100#define AF_APPLETALK PF_APPLETALK
101#define AF_NETROM PF_NETROM
102#define AF_BRIDGE PF_BRIDGE
103#define AF_ATMPVC PF_ATMPVC
104#define AF_X25 PF_X25
105#define AF_INET6 PF_INET6
106#define AF_ROSE PF_ROSE
107#define AF_DECnet PF_DECnet
108#define AF_NETBEUI PF_NETBEUI
109#define AF_SECURITY PF_SECURITY
110#define AF_KEY PF_KEY
111#define AF_NETLINK PF_NETLINK
112#define AF_ROUTE PF_ROUTE
113#define AF_PACKET PF_PACKET
114#define AF_ASH PF_ASH
115#define AF_ECONET PF_ECONET
116#define AF_ATMSVC PF_ATMSVC
117#define AF_RDS PF_RDS
118#define AF_SNA PF_SNA
119#define AF_IRDA PF_IRDA
120#define AF_PPPOX PF_PPPOX
121#define AF_WANPIPE PF_WANPIPE
122#define AF_LLC PF_LLC
123#define AF_IB PF_IB
124#define AF_MPLS PF_MPLS
125#define AF_CAN PF_CAN
126#define AF_TIPC PF_TIPC
127#define AF_BLUETOOTH PF_BLUETOOTH
128#define AF_IUCV PF_IUCV
129#define AF_RXRPC PF_RXRPC
130#define AF_ISDN PF_ISDN
131#define AF_PHONET PF_PHONET
132#define AF_IEEE802154 PF_IEEE802154
133#define AF_CAIF PF_CAIF
134#define AF_ALG PF_ALG
135#define AF_NFC PF_NFC
136#define AF_VSOCK PF_VSOCK
137#define AF_KCM PF_KCM
138#define AF_QIPCRTR PF_QIPCRTR
139#define AF_SMC PF_SMC
140#define AF_XDP PF_XDP
141#define AF_MCTP PF_MCTP
142#define AF_MAX PF_MAX
143
144/* Socket level values. Others are defined in the appropriate headers.
145
146 XXX These definitions also should go into the appropriate headers as
147 far as they are available. */
148#define SOL_RAW 255
149#define SOL_DECNET 261
150#define SOL_X25 262
151#define SOL_PACKET 263
152#define SOL_ATM 264 /* ATM layer (cell level). */
153#define SOL_AAL 265 /* ATM Adaption Layer (packet level). */
154#define SOL_IRDA 266
155#define SOL_NETBEUI 267
156#define SOL_LLC 268
157#define SOL_DCCP 269
158#define SOL_NETLINK 270
159#define SOL_TIPC 271
160#define SOL_RXRPC 272
161#define SOL_PPPOL2TP 273
162#define SOL_BLUETOOTH 274
163#define SOL_PNPIPE 275
164#define SOL_RDS 276
165#define SOL_IUCV 277
166#define SOL_CAIF 278
167#define SOL_ALG 279
168#define SOL_NFC 280
169#define SOL_KCM 281
170#define SOL_TLS 282
171#define SOL_XDP 283
172#define SOL_MPTCP 284
173#define SOL_MCTP 285
174#define SOL_SMC 286
175#define SOL_VSOCK 287
176
177/* Maximum queue length specifiable by listen. */
178#define SOMAXCONN 4096
179
180/* Get the definition of the macro to define the common sockaddr members. */
181#include <bits/sockaddr.h>
182
183/* Structure describing a generic socket address. */
184struct __attribute_struct_may_alias__ sockaddr
185 {
186 __SOCKADDR_COMMON (sa_); /* Common data: address family and length. */
187 char sa_data[14]; /* Address data. */
188 };
189
190
191/* Structure large enough to hold any socket address (with the historical
192 exception of AF_UNIX). */
193#define __ss_aligntype unsigned long int
194#define _SS_PADSIZE \
195 (_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype))
196
197struct __attribute_struct_may_alias__ sockaddr_storage
198 {
199 __SOCKADDR_COMMON (ss_); /* Address family, etc. */
200 char __ss_padding[_SS_PADSIZE];
201 __ss_aligntype __ss_align; /* Force desired alignment. */
202 };
203
204
205/* Bits in the FLAGS argument to `send', `recv', et al. */
206enum
207 {
208 MSG_OOB = 0x01, /* Process out-of-band data. */
209#define MSG_OOB MSG_OOB
210 MSG_PEEK = 0x02, /* Peek at incoming messages. */
211#define MSG_PEEK MSG_PEEK
212 MSG_DONTROUTE = 0x04, /* Don't use local routing. */
213#define MSG_DONTROUTE MSG_DONTROUTE
214#ifdef __USE_GNU
215 /* DECnet uses a different name. */
216 MSG_TRYHARD = MSG_DONTROUTE,
217# define MSG_TRYHARD MSG_DONTROUTE
218#endif
219 MSG_CTRUNC = 0x08, /* Control data lost before delivery. */
220#define MSG_CTRUNC MSG_CTRUNC
221 MSG_PROXY = 0x10, /* Supply or ask second address. */
222#define MSG_PROXY MSG_PROXY
223 MSG_TRUNC = 0x20,
224#define MSG_TRUNC MSG_TRUNC
225 MSG_DONTWAIT = 0x40, /* Nonblocking IO. */
226#define MSG_DONTWAIT MSG_DONTWAIT
227 MSG_EOR = 0x80, /* End of record. */
228#define MSG_EOR MSG_EOR
229 MSG_WAITALL = 0x100, /* Wait for a full request. */
230#define MSG_WAITALL MSG_WAITALL
231 MSG_FIN = 0x200,
232#define MSG_FIN MSG_FIN
233 MSG_SYN = 0x400,
234#define MSG_SYN MSG_SYN
235 MSG_CONFIRM = 0x800, /* Confirm path validity. */
236#define MSG_CONFIRM MSG_CONFIRM
237 MSG_RST = 0x1000,
238#define MSG_RST MSG_RST
239 MSG_ERRQUEUE = 0x2000, /* Fetch message from error queue. */
240#define MSG_ERRQUEUE MSG_ERRQUEUE
241 MSG_NOSIGNAL = 0x4000, /* Do not generate SIGPIPE. */
242#define MSG_NOSIGNAL MSG_NOSIGNAL
243 MSG_MORE = 0x8000, /* Sender will send more. */
244#define MSG_MORE MSG_MORE
245 MSG_WAITFORONE = 0x10000, /* Wait for at least one packet to return.*/
246#define MSG_WAITFORONE MSG_WAITFORONE
247 MSG_BATCH = 0x40000, /* sendmmsg: more messages coming. */
248#define MSG_BATCH MSG_BATCH
249 MSG_SOCK_DEVMEM = 0x2000000, /* Receive devmem skbs as cmsg. */
250#define MSG_SOCK_DEVMEM MSG_SOCK_DEVMEM
251 MSG_ZEROCOPY = 0x4000000, /* Use user data in kernel path. */
252#define MSG_ZEROCOPY MSG_ZEROCOPY
253 MSG_FASTOPEN = 0x20000000, /* Send data in TCP SYN. */
254#define MSG_FASTOPEN MSG_FASTOPEN
255
256 MSG_CMSG_CLOEXEC = 0x40000000 /* Set close_on_exit for file
257 descriptor received through
258 SCM_RIGHTS. */
259#define MSG_CMSG_CLOEXEC MSG_CMSG_CLOEXEC
260 };
261
262
263/* Structure describing messages sent by
264 `sendmsg' and received by `recvmsg'. */
265struct msghdr
266 {
267 void *msg_name; /* Address to send to/receive from. */
268 socklen_t msg_namelen; /* Length of address data. */
269
270 struct iovec *msg_iov; /* Vector of data to send/receive into. */
271 size_t msg_iovlen; /* Number of elements in the vector. */
272
273 void *msg_control; /* Ancillary data (eg BSD filedesc passing). */
274 size_t msg_controllen; /* Ancillary data buffer length.
275 !! The type should be socklen_t but the
276 definition of the kernel is incompatible
277 with this. */
278
279 int msg_flags; /* Flags on received message. */
280 };
281
282/* Structure used for storage of ancillary data object information. */
283struct cmsghdr
284 {
285 size_t cmsg_len; /* Length of data in cmsg_data plus length
286 of cmsghdr structure.
287 !! The type should be socklen_t but the
288 definition of the kernel is incompatible
289 with this. */
290 int cmsg_level; /* Originating protocol. */
291 int cmsg_type; /* Protocol specific type. */
292#if __glibc_c99_flexarr_available
293 __extension__ unsigned char __cmsg_data __flexarr; /* Ancillary data. */
294#endif
295 };
296
297/* Ancillary data object manipulation macros. */
298#if __glibc_c99_flexarr_available
299# define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
300#else
301# define CMSG_DATA(cmsg) ((unsigned char *) ((struct cmsghdr *) (cmsg) + 1))
302#endif
303#define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg)
304#define CMSG_FIRSTHDR(mhdr) \
305 ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) \
306 ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) 0)
307#define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \
308 & (size_t) ~(sizeof (size_t) - 1))
309#define CMSG_SPACE(len) (CMSG_ALIGN (len) \
310 + CMSG_ALIGN (sizeof (struct cmsghdr)))
311#define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
312
313/* Given a length, return the additional padding necessary such that
314 len + __CMSG_PADDING(len) == CMSG_ALIGN (len). */
315#define __CMSG_PADDING(len) ((sizeof (size_t) \
316 - ((len) & (sizeof (size_t) - 1))) \
317 & (sizeof (size_t) - 1))
318
319extern struct cmsghdr *__cmsg_nxthdr (struct msghdr *__mhdr,
320 struct cmsghdr *__cmsg) __THROW;
321#ifdef __USE_EXTERN_INLINES
322# ifndef _EXTERN_INLINE
323# define _EXTERN_INLINE __extern_inline
324# endif
325_EXTERN_INLINE struct cmsghdr *
326__NTH (__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg))
327{
328 /* We may safely assume that __cmsg lies between __mhdr->msg_control and
329 __mhdr->msg_controllen because the user is required to obtain the first
330 cmsg via CMSG_FIRSTHDR, set its length, then obtain subsequent cmsgs
331 via CMSG_NXTHDR, setting lengths along the way. However, we don't yet
332 trust the value of __cmsg->cmsg_len and therefore do not use it in any
333 pointer arithmetic until we check its value. */
334
335 unsigned char * __msg_control_ptr = (unsigned char *) __mhdr->msg_control;
336 unsigned char * __cmsg_ptr = (unsigned char *) __cmsg;
337
338 size_t __size_needed = sizeof (struct cmsghdr)
339 + __CMSG_PADDING (__cmsg->cmsg_len);
340
341 /* The current header is malformed, too small to be a full header. */
342 if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
343 return (struct cmsghdr *) 0;
344
345 /* There isn't enough space between __cmsg and the end of the buffer to
346 hold the current cmsg *and* the next one. */
347 if (((size_t)
348 (__msg_control_ptr + __mhdr->msg_controllen - __cmsg_ptr)
349 < __size_needed)
350 || ((size_t)
351 (__msg_control_ptr + __mhdr->msg_controllen - __cmsg_ptr
352 - __size_needed)
353 < __cmsg->cmsg_len))
354
355 return (struct cmsghdr *) 0;
356
357 /* Now, we trust cmsg_len and can use it to find the next header. */
358 __cmsg = (struct cmsghdr *) ((unsigned char *) __cmsg
359 + CMSG_ALIGN (__cmsg->cmsg_len));
360 return __cmsg;
361}
362#endif /* Use `extern inline'. */
363
364/* Socket level message types. This must match the definitions in
365 <linux/socket.h>. */
366enum
367 {
368 SCM_RIGHTS = 0x01 /* Transfer file descriptors. */
369#define SCM_RIGHTS SCM_RIGHTS
370#ifdef __USE_GNU
371 , SCM_CREDENTIALS = 0x02 /* Credentials passing. */
372# define SCM_CREDENTIALS SCM_CREDENTIALS
373 , SCM_SECURITY = 0x03 /* Security label. */
374# define SCM_SECURITY SCM_SECURITY
375 , SCM_PIDFD = 0x04 /* Pidfd. */
376# define SCM_PIDFD SCM_PIDFD
377#endif
378 };
379
380#ifdef __USE_GNU
381/* User visible structure for SCM_CREDENTIALS message */
382struct ucred
383{
384 pid_t pid; /* PID of sending process. */
385 uid_t uid; /* UID of sending process. */
386 gid_t gid; /* GID of sending process. */
387};
388#endif
389
390#ifdef __USE_MISC
391# include <bits/types/time_t.h>
392# include <asm/socket.h>
393#else
394# define SO_DEBUG 1
395# include <bits/socket-constants.h>
396#endif
397
398/* Structure used to manipulate the SO_LINGER option. */
399struct linger
400 {
401 int l_onoff; /* Nonzero to linger on close. */
402 int l_linger; /* Time to linger. */
403 };
404
405#endif /* bits/socket.h */