FreeBSD/Linux Kernel Cross Reference
sys/sys/socket.h
1 /*
2 * Copyright (c) 1982, 1985, 1986, 1988, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)socket.h 8.4 (Berkeley) 2/21/94
34 * $FreeBSD: releng/5.0/sys/sys/socket.h 106847 2002-11-13 11:49:24Z mike $
35 */
36
37 #ifndef _SYS_SOCKET_H_
38 #define _SYS_SOCKET_H_
39
40 #include <sys/cdefs.h>
41 #include <sys/_types.h>
42 #define _NO_NAMESPACE_POLLUTION
43 #include <machine/param.h>
44 #undef _NO_NAMESPACE_POLLUTION
45
46 /*
47 * Definitions related to sockets: types, address families, options.
48 */
49
50 /*
51 * Data types.
52 */
53 #if __BSD_VISIBLE
54 #ifndef _GID_T_DECLARED
55 typedef __gid_t gid_t;
56 #define _GID_T_DECLARED
57 #endif
58
59 #ifndef _OFF_T_DECLARED
60 typedef __off_t off_t;
61 #define _OFF_T_DECLARED
62 #endif
63
64 #ifndef _PID_T_DECLARED
65 typedef __pid_t pid_t;
66 #define _PID_T_DECLARED
67 #endif
68 #endif
69
70 #ifndef _SA_FAMILY_T_DECLARED
71 typedef __sa_family_t sa_family_t;
72 #define _SA_FAMILY_T_DECLARED
73 #endif
74
75 #ifndef _SIZE_T_DECLARED
76 typedef __size_t size_t;
77 #define _SIZE_T_DECLARED
78 #endif
79
80 #ifndef _SOCKLEN_T_DECLARED
81 typedef __socklen_t socklen_t;
82 #define _SOCKLEN_T_DECLARED
83 #endif
84
85 #ifndef _SSIZE_T_DECLARED
86 typedef __ssize_t ssize_t;
87 #define _SSIZE_T_DECLARED
88 #endif
89
90 #if __BSD_VISIBLE
91 #ifndef _UID_T_DECLARED
92 typedef __uid_t uid_t;
93 #define _UID_T_DECLARED
94 #endif
95 #endif
96
97 /*
98 * Types
99 */
100 #define SOCK_STREAM 1 /* stream socket */
101 #define SOCK_DGRAM 2 /* datagram socket */
102 #define SOCK_RAW 3 /* raw-protocol interface */
103 #if __BSD_VISIBLE
104 #define SOCK_RDM 4 /* reliably-delivered message */
105 #endif
106 #define SOCK_SEQPACKET 5 /* sequenced packet stream */
107
108 /*
109 * Option flags per-socket.
110 */
111 #define SO_DEBUG 0x0001 /* turn on debugging info recording */
112 #define SO_ACCEPTCONN 0x0002 /* socket has had listen() */
113 #define SO_REUSEADDR 0x0004 /* allow local address reuse */
114 #define SO_KEEPALIVE 0x0008 /* keep connections alive */
115 #define SO_DONTROUTE 0x0010 /* just use interface addresses */
116 #define SO_BROADCAST 0x0020 /* permit sending of broadcast msgs */
117 #if __BSD_VISIBLE
118 #define SO_USELOOPBACK 0x0040 /* bypass hardware when possible */
119 #endif
120 #define SO_LINGER 0x0080 /* linger on close if data present */
121 #define SO_OOBINLINE 0x0100 /* leave received OOB data in line */
122 #if __BSD_VISIBLE
123 #define SO_REUSEPORT 0x0200 /* allow local address & port reuse */
124 #define SO_TIMESTAMP 0x0400 /* timestamp received dgram traffic */
125 #define SO_NOSIGPIPE 0x0800 /* no SIGPIPE from EPIPE */
126 #define SO_ACCEPTFILTER 0x1000 /* there is an accept filter */
127 #endif
128
129 /*
130 * Additional options, not kept in so_options.
131 */
132 #define SO_SNDBUF 0x1001 /* send buffer size */
133 #define SO_RCVBUF 0x1002 /* receive buffer size */
134 #define SO_SNDLOWAT 0x1003 /* send low-water mark */
135 #define SO_RCVLOWAT 0x1004 /* receive low-water mark */
136 #define SO_SNDTIMEO 0x1005 /* send timeout */
137 #define SO_RCVTIMEO 0x1006 /* receive timeout */
138 #define SO_ERROR 0x1007 /* get error status and clear */
139 #define SO_TYPE 0x1008 /* get socket type */
140 #if __BSD_VISIBLE
141 #define SO_LABEL 0x1009 /* socket's MAC label */
142 #define SO_PEERLABEL 0x1010 /* socket's peer's MAC label */
143 #endif
144
145 /*
146 * Structure used for manipulating linger option.
147 */
148 struct linger {
149 int l_onoff; /* option on/off */
150 int l_linger; /* linger time */
151 };
152
153 #if __BSD_VISIBLE
154 struct accept_filter_arg {
155 char af_name[16];
156 char af_arg[256-16];
157 };
158 #endif
159
160 /*
161 * Level number for (get/set)sockopt() to apply to socket itself.
162 */
163 #define SOL_SOCKET 0xffff /* options for socket level */
164
165 /*
166 * Address families.
167 */
168 #define AF_UNSPEC 0 /* unspecified */
169 #if __BSD_VISIBLE
170 #define AF_LOCAL AF_UNIX /* local to host (pipes, portals) */
171 #endif
172 #define AF_UNIX 1 /* standardized name for AF_LOCAL */
173 #define AF_INET 2 /* internetwork: UDP, TCP, etc. */
174 #if __BSD_VISIBLE
175 #define AF_IMPLINK 3 /* arpanet imp addresses */
176 #define AF_PUP 4 /* pup protocols: e.g. BSP */
177 #define AF_CHAOS 5 /* mit CHAOS protocols */
178 #define AF_NS 6 /* XEROX NS protocols */
179 #define AF_ISO 7 /* ISO protocols */
180 #define AF_OSI AF_ISO
181 #define AF_ECMA 8 /* European computer manufacturers */
182 #define AF_DATAKIT 9 /* datakit protocols */
183 #define AF_CCITT 10 /* CCITT protocols, X.25 etc */
184 #define AF_SNA 11 /* IBM SNA */
185 #define AF_DECnet 12 /* DECnet */
186 #define AF_DLI 13 /* DEC Direct data link interface */
187 #define AF_LAT 14 /* LAT */
188 #define AF_HYLINK 15 /* NSC Hyperchannel */
189 #define AF_APPLETALK 16 /* Apple Talk */
190 #define AF_ROUTE 17 /* Internal Routing Protocol */
191 #define AF_LINK 18 /* Link layer interface */
192 #define pseudo_AF_XTP 19 /* eXpress Transfer Protocol (no AF) */
193 #define AF_COIP 20 /* connection-oriented IP, aka ST II */
194 #define AF_CNT 21 /* Computer Network Technology */
195 #define pseudo_AF_RTIP 22 /* Help Identify RTIP packets */
196 #define AF_IPX 23 /* Novell Internet Protocol */
197 #define AF_SIP 24 /* Simple Internet Protocol */
198 #define pseudo_AF_PIP 25 /* Help Identify PIP packets */
199 #define AF_ISDN 26 /* Integrated Services Digital Network*/
200 #define AF_E164 AF_ISDN /* CCITT E.164 recommendation */
201 #define pseudo_AF_KEY 27 /* Internal key-management function */
202 #endif
203 #define AF_INET6 28 /* IPv6 */
204 #if __BSD_VISIBLE
205 #define AF_NATM 29 /* native ATM access */
206 #define AF_ATM 30 /* ATM */
207 #define pseudo_AF_HDRCMPLT 31 /* Used by BPF to not rewrite headers
208 * in interface output routine
209 */
210 #define AF_NETGRAPH 32 /* Netgraph sockets */
211 #define AF_SLOW 33 /* 802.3ad slow protocol */
212 #define AF_SCLUSTER 34 /* Sitara cluster protocol */
213 #define AF_MAX 35
214 #endif
215
216 /*
217 * Structure used by kernel to store most
218 * addresses.
219 */
220 struct sockaddr {
221 unsigned char sa_len; /* total length */
222 sa_family_t sa_family; /* address family */
223 char sa_data[14]; /* actually longer; address value */
224 };
225 #if __BSD_VISIBLE
226 #define SOCK_MAXADDRLEN 255 /* longest possible addresses */
227
228 /*
229 * Structure used by kernel to pass protocol
230 * information in raw sockets.
231 */
232 struct sockproto {
233 unsigned short sp_family; /* address family */
234 unsigned short sp_protocol; /* protocol */
235 };
236 #endif
237
238 /*
239 * RFC 2553: protocol-independent placeholder for socket addresses
240 */
241 #define _SS_MAXSIZE 128U
242 #define _SS_ALIGNSIZE (sizeof(__int64_t))
243 #define _SS_PAD1SIZE (_SS_ALIGNSIZE - sizeof(unsigned char) - \
244 sizeof(sa_family_t))
245 #define _SS_PAD2SIZE (_SS_MAXSIZE - sizeof(unsigned char) - \
246 sizeof(sa_family_t) - _SS_PAD1SIZE - _SS_ALIGNSIZE)
247
248 struct sockaddr_storage {
249 unsigned char ss_len; /* address length */
250 sa_family_t ss_family; /* address family */
251 char __ss_pad1[_SS_PAD1SIZE];
252 __int64_t __ss_align; /* force desired struct alignment */
253 char __ss_pad2[_SS_PAD2SIZE];
254 };
255
256 #if __BSD_VISIBLE
257 /*
258 * Protocol families, same as address families for now.
259 */
260 #define PF_UNSPEC AF_UNSPEC
261 #define PF_LOCAL AF_LOCAL
262 #define PF_UNIX PF_LOCAL /* backward compatibility */
263 #define PF_INET AF_INET
264 #define PF_IMPLINK AF_IMPLINK
265 #define PF_PUP AF_PUP
266 #define PF_CHAOS AF_CHAOS
267 #define PF_NS AF_NS
268 #define PF_ISO AF_ISO
269 #define PF_OSI AF_ISO
270 #define PF_ECMA AF_ECMA
271 #define PF_DATAKIT AF_DATAKIT
272 #define PF_CCITT AF_CCITT
273 #define PF_SNA AF_SNA
274 #define PF_DECnet AF_DECnet
275 #define PF_DLI AF_DLI
276 #define PF_LAT AF_LAT
277 #define PF_HYLINK AF_HYLINK
278 #define PF_APPLETALK AF_APPLETALK
279 #define PF_ROUTE AF_ROUTE
280 #define PF_LINK AF_LINK
281 #define PF_XTP pseudo_AF_XTP /* really just proto family, no AF */
282 #define PF_COIP AF_COIP
283 #define PF_CNT AF_CNT
284 #define PF_SIP AF_SIP
285 #define PF_IPX AF_IPX /* same format as AF_NS */
286 #define PF_RTIP pseudo_AF_RTIP /* same format as AF_INET */
287 #define PF_PIP pseudo_AF_PIP
288 #define PF_ISDN AF_ISDN
289 #define PF_KEY pseudo_AF_KEY
290 #define PF_INET6 AF_INET6
291 #define PF_NATM AF_NATM
292 #define PF_ATM AF_ATM
293 #define PF_NETGRAPH AF_NETGRAPH
294 #define PF_SLOW AF_SLOW
295 #define PF_SCLUSTER AF_SCLUSTER
296
297 #define PF_MAX AF_MAX
298
299 /*
300 * Definitions for network related sysctl, CTL_NET.
301 *
302 * Second level is protocol family.
303 * Third level is protocol number.
304 *
305 * Further levels are defined by the individual families below.
306 */
307 #define NET_MAXID AF_MAX
308
309 #define CTL_NET_NAMES { \
310 { 0, 0 }, \
311 { "unix", CTLTYPE_NODE }, \
312 { "inet", CTLTYPE_NODE }, \
313 { "implink", CTLTYPE_NODE }, \
314 { "pup", CTLTYPE_NODE }, \
315 { "chaos", CTLTYPE_NODE }, \
316 { "xerox_ns", CTLTYPE_NODE }, \
317 { "iso", CTLTYPE_NODE }, \
318 { "emca", CTLTYPE_NODE }, \
319 { "datakit", CTLTYPE_NODE }, \
320 { "ccitt", CTLTYPE_NODE }, \
321 { "ibm_sna", CTLTYPE_NODE }, \
322 { "decnet", CTLTYPE_NODE }, \
323 { "dec_dli", CTLTYPE_NODE }, \
324 { "lat", CTLTYPE_NODE }, \
325 { "hylink", CTLTYPE_NODE }, \
326 { "appletalk", CTLTYPE_NODE }, \
327 { "route", CTLTYPE_NODE }, \
328 { "link_layer", CTLTYPE_NODE }, \
329 { "xtp", CTLTYPE_NODE }, \
330 { "coip", CTLTYPE_NODE }, \
331 { "cnt", CTLTYPE_NODE }, \
332 { "rtip", CTLTYPE_NODE }, \
333 { "ipx", CTLTYPE_NODE }, \
334 { "sip", CTLTYPE_NODE }, \
335 { "pip", CTLTYPE_NODE }, \
336 { "isdn", CTLTYPE_NODE }, \
337 { "key", CTLTYPE_NODE }, \
338 { "inet6", CTLTYPE_NODE }, \
339 { "natm", CTLTYPE_NODE }, \
340 { "atm", CTLTYPE_NODE }, \
341 { "hdrcomplete", CTLTYPE_NODE }, \
342 { "netgraph", CTLTYPE_NODE }, \
343 { "snp", CTLTYPE_NODE }, \
344 { "scp", CTLTYPE_NODE }, \
345 }
346
347 /*
348 * PF_ROUTE - Routing table
349 *
350 * Three additional levels are defined:
351 * Fourth: address family, 0 is wildcard
352 * Fifth: type of info, defined below
353 * Sixth: flag(s) to mask with for NET_RT_FLAGS
354 */
355 #define NET_RT_DUMP 1 /* dump; may limit to a.f. */
356 #define NET_RT_FLAGS 2 /* by flags, e.g. RESOLVING */
357 #define NET_RT_IFLIST 3 /* survey interface list */
358 #define NET_RT_MAXID 4
359
360 #define CTL_NET_RT_NAMES { \
361 { 0, 0 }, \
362 { "dump", CTLTYPE_STRUCT }, \
363 { "flags", CTLTYPE_STRUCT }, \
364 { "iflist", CTLTYPE_STRUCT }, \
365 }
366 #endif /* __BSD_VISIBLE */
367
368 /*
369 * Maximum queue length specifiable by listen.
370 */
371 #define SOMAXCONN 128
372
373 #ifndef _STRUCT_IOVEC_DECLARED
374 #define _STRUCT_IOVEC_DECLARED
375 struct iovec {
376 void *iov_base; /* Base address. */
377 size_t iov_len; /* Length. */
378 };
379 #endif
380
381 /*
382 * Message header for recvmsg and sendmsg calls.
383 * Used value-result for recvmsg, value only for sendmsg.
384 */
385 struct msghdr {
386 void *msg_name; /* optional address */
387 socklen_t msg_namelen; /* size of address */
388 struct iovec *msg_iov; /* scatter/gather array */
389 int msg_iovlen; /* # elements in msg_iov */
390 void *msg_control; /* ancillary data, see below */
391 socklen_t msg_controllen; /* ancillary data buffer len */
392 int msg_flags; /* flags on received message */
393 };
394
395 #define MSG_OOB 0x1 /* process out-of-band data */
396 #define MSG_PEEK 0x2 /* peek at incoming message */
397 #define MSG_DONTROUTE 0x4 /* send without using routing tables */
398 #define MSG_EOR 0x8 /* data completes record */
399 #define MSG_TRUNC 0x10 /* data discarded before delivery */
400 #define MSG_CTRUNC 0x20 /* control data lost before delivery */
401 #define MSG_WAITALL 0x40 /* wait for full request or error */
402 #if __BSD_VISIBLE
403 #define MSG_DONTWAIT 0x80 /* this message should be nonblocking */
404 #define MSG_EOF 0x100 /* data completes connection */
405 #define MSG_COMPAT 0x8000 /* used in sendit() */
406 #endif
407
408 /*
409 * Header for ancillary data objects in msg_control buffer.
410 * Used for additional information with/about a datagram
411 * not expressible by flags. The format is a sequence
412 * of message elements headed by cmsghdr structures.
413 */
414 struct cmsghdr {
415 socklen_t cmsg_len; /* data byte count, including hdr */
416 int cmsg_level; /* originating protocol */
417 int cmsg_type; /* protocol-specific type */
418 /* followed by u_char cmsg_data[]; */
419 };
420
421 #if __BSD_VISIBLE
422 /*
423 * While we may have more groups than this, the cmsgcred struct must
424 * be able to fit in an mbuf, and NGROUPS_MAX is too large to allow
425 * this.
426 */
427 #define CMGROUP_MAX 16
428
429 /*
430 * Credentials structure, used to verify the identity of a peer
431 * process that has sent us a message. This is allocated by the
432 * peer process but filled in by the kernel. This prevents the
433 * peer from lying about its identity. (Note that cmcred_groups[0]
434 * is the effective GID.)
435 */
436 struct cmsgcred {
437 pid_t cmcred_pid; /* PID of sending process */
438 uid_t cmcred_uid; /* real UID of sending process */
439 uid_t cmcred_euid; /* effective UID of sending process */
440 gid_t cmcred_gid; /* real GID of sending process */
441 short cmcred_ngroups; /* number or groups */
442 gid_t cmcred_groups[CMGROUP_MAX]; /* groups */
443 };
444 #endif /* __BSD_VISIBLE */
445
446 /* given pointer to struct cmsghdr, return pointer to data */
447 #define CMSG_DATA(cmsg) ((unsigned char *)(cmsg) + \
448 _ALIGN(sizeof(struct cmsghdr)))
449
450 /* given pointer to struct cmsghdr, return pointer to next cmsghdr */
451 #define CMSG_NXTHDR(mhdr, cmsg) \
452 (((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len) + \
453 _ALIGN(sizeof(struct cmsghdr)) > \
454 (char *)(mhdr)->msg_control + (mhdr)->msg_controllen) ? \
455 (struct cmsghdr *)NULL : \
456 (struct cmsghdr *)((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len)))
457
458 #define CMSG_FIRSTHDR(mhdr) ((struct cmsghdr *)(mhdr)->msg_control)
459
460 #if __BSD_VISIBLE
461 /* RFC 2292 additions */
462 #define CMSG_SPACE(l) (_ALIGN(sizeof(struct cmsghdr)) + _ALIGN(l))
463 #define CMSG_LEN(l) (_ALIGN(sizeof(struct cmsghdr)) + (l))
464 #endif
465
466 #ifdef _KERNEL
467 #define CMSG_ALIGN(n) _ALIGN(n)
468 #endif
469
470 /* "Socket"-level control message types: */
471 #define SCM_RIGHTS 0x01 /* access rights (array of int) */
472 #if __BSD_VISIBLE
473 #define SCM_TIMESTAMP 0x02 /* timestamp (struct timeval) */
474 #define SCM_CREDS 0x03 /* process creds (struct cmsgcred) */
475 #endif
476
477 #if __BSD_VISIBLE
478 /*
479 * 4.3 compat sockaddr, move to compat file later
480 */
481 struct osockaddr {
482 unsigned short sa_family; /* address family */
483 char sa_data[14]; /* up to 14 bytes of direct address */
484 };
485
486 /*
487 * 4.3-compat message header (move to compat file later).
488 */
489 struct omsghdr {
490 char *msg_name; /* optional address */
491 int msg_namelen; /* size of address */
492 struct iovec *msg_iov; /* scatter/gather array */
493 int msg_iovlen; /* # elements in msg_iov */
494 char *msg_accrights; /* access rights sent/received */
495 int msg_accrightslen;
496 };
497 #endif
498
499 /*
500 * howto arguments for shutdown(2), specified by Posix.1g.
501 */
502 #define SHUT_RD 0 /* shut down the reading side */
503 #define SHUT_WR 1 /* shut down the writing side */
504 #define SHUT_RDWR 2 /* shut down both sides */
505
506 #if __BSD_VISIBLE
507 /*
508 * sendfile(2) header/trailer struct
509 */
510 struct sf_hdtr {
511 struct iovec *headers; /* pointer to an array of header struct iovec's */
512 int hdr_cnt; /* number of header iovec's */
513 struct iovec *trailers; /* pointer to an array of trailer struct iovec's */
514 int trl_cnt; /* number of trailer iovec's */
515 };
516 #endif
517
518 #ifndef _KERNEL
519
520 #include <sys/cdefs.h>
521
522 __BEGIN_DECLS
523 /*
524 * XXX functions missing restrict type-qualifiers.
525 */
526 int accept(int, struct sockaddr *, socklen_t *);
527 int bind(int, const struct sockaddr *, socklen_t);
528 int connect(int, const struct sockaddr *, socklen_t);
529 int getpeername(int, struct sockaddr *, socklen_t *);
530 int getsockname(int, struct sockaddr *, socklen_t *);
531 int getsockopt(int, int, int, void *, socklen_t *);
532 int listen(int, int);
533 ssize_t recv(int, void *, size_t, int);
534 ssize_t recvfrom(int, void *, size_t, int, struct sockaddr *, socklen_t *);
535 ssize_t recvmsg(int, struct msghdr *, int);
536 ssize_t send(int, const void *, size_t, int);
537 ssize_t sendto(int, const void *,
538 size_t, int, const struct sockaddr *, socklen_t);
539 ssize_t sendmsg(int, const struct msghdr *, int);
540 #if __BSD_VISIBLE
541 int sendfile(int, int, off_t, size_t, struct sf_hdtr *, off_t *, int);
542 #endif
543 int setsockopt(int, int, int, const void *, socklen_t);
544 int shutdown(int, int);
545 int socket(int, int, int);
546 int socketpair(int, int, int, int *);
547 /*
548 * XXX missing sockatmark().
549 */
550 __END_DECLS
551
552 #endif /* !_KERNEL */
553
554 #endif /* !_SYS_SOCKET_H_ */
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