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: src/sys/sys/socket.h,v 1.39.2.7 2001/07/03 11:02:01 ume Exp $
  35  * $DragonFly: src/sys/sys/socket.h,v 1.23 2008/11/10 18:16:51 dillon Exp $
  36  */
  37
  38 #ifndef _SYS_SOCKET_H_
  39 #define _SYS_SOCKET_H_
  40
  41 #include <sys/_iovec.h>
  42
  43 #ifndef _SYS_TYPES_H_
  44 #include <sys/types.h>
  45 #endif
  46 #ifndef _MACHINE_STDINT_H_
  47 #include <machine/stdint.h>
  48 #endif
  49
  50 #define _NO_NAMESPACE_POLLUTION
  51 #include <machine/param.h>
  52 #undef _NO_NAMESPACE_POLLUTION
  53
  54 /*
  55  * Definitions related to sockets: types, address families, options.
  56  */
  57
  58 /*
  59  * Data types.
  60  */
  61 typedef __uint8_t       sa_family_t;
  62
  63 #ifndef _SOCKLEN_T_DECLARED
  64 #define _SOCKLEN_T_DECLARED
  65 typedef __socklen_t     socklen_t;
  66 #endif
  67
  68
  69 /*
  70  * Types
  71  */
  72 #define SOCK_STREAM     1               /* stream socket */
  73 #define SOCK_DGRAM      2               /* datagram socket */
  74 #define SOCK_RAW        3               /* raw-protocol interface */
  75 #define SOCK_RDM        4               /* reliably-delivered message */
  76 #define SOCK_SEQPACKET  5               /* sequenced packet stream */
  77
  78 /*
  79  * Option flags per-socket.
  80  */
  81 #define SO_DEBUG        0x0001          /* turn on debugging info recording */
  82 #define SO_ACCEPTCONN   0x0002          /* socket has had listen() */
  83 #define SO_REUSEADDR    0x0004          /* allow local address reuse */
  84 #define SO_KEEPALIVE    0x0008          /* keep connections alive */
  85 #define SO_DONTROUTE    0x0010          /* just use interface addresses */
  86 #define SO_BROADCAST    0x0020          /* permit sending of broadcast msgs */
  87 #define SO_USELOOPBACK  0x0040          /* bypass hardware when possible */
  88 #define SO_LINGER       0x0080          /* linger on close if data present */
  89 #define SO_OOBINLINE    0x0100          /* leave received OOB data in line */
  90 #define SO_REUSEPORT    0x0200          /* allow local address & port reuse */
  91 #define SO_TIMESTAMP    0x0400          /* timestamp received dgram traffic */
  92 #define SO_ACCEPTFILTER 0x1000          /* there is an accept filter */
  93
  94 /*
  95  * Additional options, not kept in so_options.
  96  */
  97 #define SO_SNDBUF       0x1001          /* send buffer size */
  98 #define SO_RCVBUF       0x1002          /* receive buffer size */
  99 #define SO_SNDLOWAT     0x1003          /* send low-water mark */
 100 #define SO_RCVLOWAT     0x1004          /* receive low-water mark */
 101 #define SO_SNDTIMEO     0x1005          /* send timeout */
 102 #define SO_RCVTIMEO     0x1006          /* receive timeout */
 103 #define SO_ERROR        0x1007          /* get error status and clear */
 104 #define SO_TYPE         0x1008          /* get socket type */
 105 /*efine SO_PRIVSTATE    0x1009             get/deny privileged state */
 106
 107 /*
 108  * Structure used for manipulating linger option.
 109  */
 110 struct  linger {
 111         int     l_onoff;                /* option on/off */
 112         int     l_linger;               /* linger time */
 113 };
 114
 115 struct  accept_filter_arg {
 116         char    af_name[16];
 117         char    af_arg[256-16];
 118 };
 119
 120 /*
 121  * Level number for (get/set)sockopt() to apply to socket itself.
 122  */
 123 #define SOL_SOCKET      0xffff          /* options for socket level */
 124
 125 /*
 126  * Address families.
 127  */
 128 #define AF_UNSPEC       0               /* unspecified */
 129 #define AF_LOCAL        1               /* local to host (pipes, portals) */
 130 #define AF_UNIX         AF_LOCAL        /* backward compatibility */
 131 #define AF_INET         2               /* internetwork: UDP, TCP, etc. */
 132 #define AF_IMPLINK      3               /* arpanet imp addresses */
 133 #define AF_PUP          4               /* pup protocols: e.g. BSP */
 134 #define AF_CHAOS        5               /* mit CHAOS protocols */
 135 #define AF_NS           6               /* XEROX NS protocols */
 136 #define AF_ISO          7               /* ISO protocols */
 137 #define AF_OSI          AF_ISO
 138 #define AF_ECMA         8               /* European computer manufacturers */
 139 #define AF_DATAKIT      9               /* datakit protocols */
 140 #define AF_CCITT        10              /* CCITT protocols, X.25 etc */
 141 #define AF_SNA          11              /* IBM SNA */
 142 #define AF_DECnet       12              /* DECnet */
 143 #define AF_DLI          13              /* DEC Direct data link interface */
 144 #define AF_LAT          14              /* LAT */
 145 #define AF_HYLINK       15              /* NSC Hyperchannel */
 146 #define AF_APPLETALK    16              /* Apple Talk */
 147 #define AF_ROUTE        17              /* Internal Routing Protocol */
 148 #define AF_LINK         18              /* Link layer interface */
 149 #define pseudo_AF_XTP   19              /* eXpress Transfer Protocol (no AF) */
 150 #define AF_COIP         20              /* connection-oriented IP, aka ST II */
 151 #define AF_CNT          21              /* Computer Network Technology */
 152 #define pseudo_AF_RTIP  22              /* Help Identify RTIP packets */
 153 #define AF_IPX          23              /* Novell Internet Protocol */
 154 #define AF_SIP          24              /* Simple Internet Protocol */
 155 #define pseudo_AF_PIP   25              /* Help Identify PIP packets */
 156 #define AF_ISDN         26              /* Integrated Services Digital Network*/
 157 #define AF_E164         AF_ISDN         /* CCITT E.164 recommendation */
 158 #define pseudo_AF_KEY   27              /* Internal key-management function */
 159 #define AF_INET6        28              /* IPv6 */
 160 #define AF_NATM         29              /* native ATM access */
 161 #define AF_ATM          30              /* ATM */
 162 #define pseudo_AF_HDRCMPLT 31           /* Used by BPF to not rewrite headers
 163                                          * in interface output routine
 164                                          */
 165 #define AF_NETGRAPH     32              /* Netgraph sockets */
 166 #define AF_BLUETOOTH    33              /* Bluetooth */
 167 #define AF_MPLS         34              /* Multi-Protocol Label Switching */
 168
 169 #define AF_MAX          35
 170
 171 /*
 172  * Structure used by kernel to store most
 173  * addresses.
 174  */
 175 struct sockaddr {
 176         __uint8_t       sa_len;         /* total length */
 177         sa_family_t     sa_family;      /* address family */
 178         char            sa_data[14];    /* actually longer; address value */
 179 };
 180 #define SOCK_MAXADDRLEN 255             /* longest possible addresses */
 181
 182 #ifdef _KERNEL
 183
 184 #ifndef _SYS_LIBKERN_H_
 185 #include <sys/libkern.h>                /* for bcmp() */
 186 #endif
 187
 188 static __inline boolean_t
 189 sa_equal(const struct sockaddr *a1, const struct sockaddr *a2)
 190 {
 191         return (bcmp(a1, a2, a1->sa_len) == 0);
 192 }
 193 #endif
 194
 195 /*
 196  * Structure used by kernel to pass protocol
 197  * information in raw sockets.
 198  */
 199 struct sockproto {
 200         __uint16_t      sp_family;              /* address family */
 201         __uint16_t      sp_protocol;            /* protocol */
 202 };
 203
 204 /*
 205  * RFC 2553: protocol-independent placeholder for socket addresses
 206  */
 207 #define _SS_MAXSIZE     128
 208 #define _SS_ALIGNSIZE   (sizeof(int64_t))
 209 #define _SS_PAD1SIZE    (_SS_ALIGNSIZE - sizeof(unsigned char) - sizeof(sa_family_t))
 210 #define _SS_PAD2SIZE    (_SS_MAXSIZE - sizeof(unsigned char) - sizeof(sa_family_t) - \
 211                                 _SS_PAD1SIZE - _SS_ALIGNSIZE)
 212
 213 struct sockaddr_storage {
 214         __uint8_t       ss_len;         /* address length */
 215         sa_family_t     ss_family;      /* address family */
 216         char            __ss_pad1[_SS_PAD1SIZE];
 217         __int64_t       __ss_align;     /* force desired structure storage alignment */
 218         char            __ss_pad2[_SS_PAD2SIZE];
 219 };
 220
 221 /*
 222  * Protocol families, same as address families for now.
 223  */
 224 #define PF_UNSPEC       AF_UNSPEC
 225 #define PF_LOCAL        AF_LOCAL
 226 #define PF_UNIX         PF_LOCAL        /* backward compatibility */
 227 #define PF_INET         AF_INET
 228 #define PF_IMPLINK      AF_IMPLINK
 229 #define PF_PUP          AF_PUP
 230 #define PF_CHAOS        AF_CHAOS
 231 #define PF_NS           AF_NS
 232 #define PF_ISO          AF_ISO
 233 #define PF_OSI          AF_ISO
 234 #define PF_ECMA         AF_ECMA
 235 #define PF_DATAKIT      AF_DATAKIT
 236 #define PF_CCITT        AF_CCITT
 237 #define PF_SNA          AF_SNA
 238 #define PF_DECnet       AF_DECnet
 239 #define PF_DLI          AF_DLI
 240 #define PF_LAT          AF_LAT
 241 #define PF_HYLINK       AF_HYLINK
 242 #define PF_APPLETALK    AF_APPLETALK
 243 #define PF_ROUTE        AF_ROUTE
 244 #define PF_LINK         AF_LINK
 245 #define PF_XTP          pseudo_AF_XTP   /* really just proto family, no AF */
 246 #define PF_COIP         AF_COIP
 247 #define PF_CNT          AF_CNT
 248 #define PF_SIP          AF_SIP
 249 #define PF_IPX          AF_IPX          /* same format as AF_NS */
 250 #define PF_RTIP         pseudo_AF_RTIP  /* same format as AF_INET */
 251 #define PF_PIP          pseudo_AF_PIP
 252 #define PF_ISDN         AF_ISDN
 253 #define PF_KEY          pseudo_AF_KEY
 254 #define PF_INET6        AF_INET6
 255 #define PF_NATM         AF_NATM
 256 #define PF_ATM          AF_ATM
 257 #define PF_NETGRAPH     AF_NETGRAPH
 258 #define PF_BLUETOOTH    AF_BLUETOOTH
 259
 260 #define PF_MAX          AF_MAX
 261
 262 /*
 263  * Definitions for network related sysctl, CTL_NET.
 264  *
 265  * Second level is protocol family.
 266  * Third level is protocol number.
 267  *
 268  * Further levels are defined by the individual families below.
 269  */
 270 #define NET_MAXID       AF_MAX
 271
 272 #define CTL_NET_NAMES { \
 273         { 0, 0 }, \
 274         { "unix", CTLTYPE_NODE }, \
 275         { "inet", CTLTYPE_NODE }, \
 276         { "implink", CTLTYPE_NODE }, \
 277         { "pup", CTLTYPE_NODE }, \
 278         { "chaos", CTLTYPE_NODE }, \
 279         { "xerox_ns", CTLTYPE_NODE }, \
 280         { "iso", CTLTYPE_NODE }, \
 281         { "emca", CTLTYPE_NODE }, \
 282         { "datakit", CTLTYPE_NODE }, \
 283         { "ccitt", CTLTYPE_NODE }, \
 284         { "ibm_sna", CTLTYPE_NODE }, \
 285         { "decnet", CTLTYPE_NODE }, \
 286         { "dec_dli", CTLTYPE_NODE }, \
 287         { "lat", CTLTYPE_NODE }, \
 288         { "hylink", CTLTYPE_NODE }, \
 289         { "appletalk", CTLTYPE_NODE }, \
 290         { "route", CTLTYPE_NODE }, \
 291         { "link_layer", CTLTYPE_NODE }, \
 292         { "xtp", CTLTYPE_NODE }, \
 293         { "coip", CTLTYPE_NODE }, \
 294         { "cnt", CTLTYPE_NODE }, \
 295         { "rtip", CTLTYPE_NODE }, \
 296         { "ipx", CTLTYPE_NODE }, \
 297         { "sip", CTLTYPE_NODE }, \
 298         { "pip", CTLTYPE_NODE }, \
 299         { "isdn", CTLTYPE_NODE }, \
 300         { "key", CTLTYPE_NODE }, \
 301         { "inet6", CTLTYPE_NODE }, \
 302         { "natm", CTLTYPE_NODE }, \
 303         { "atm", CTLTYPE_NODE }, \
 304         { "hdrcomplete", CTLTYPE_NODE }, \
 305         { "netgraph", CTLTYPE_NODE }, \
 306         { "bluetooth", CTLTYPE_NODE}, \
 307 }
 308
 309 /*
 310  * PF_ROUTE - Routing table
 311  *
 312  * Three additional levels are defined:
 313  *      Fourth: address family, 0 is wildcard
 314  *      Fifth: type of info, defined below
 315  *      Sixth: flag(s) to mask with for NET_RT_FLAGS
 316  */
 317 #define NET_RT_DUMP     1               /* dump; may limit to a.f. */
 318 #define NET_RT_FLAGS    2               /* by flags, e.g. RESOLVING */
 319 #define NET_RT_IFLIST   3               /* survey interface list */
 320 #define NET_RT_MAXID    4
 321
 322 #define CTL_NET_RT_NAMES { \
 323         { 0, 0 }, \
 324         { "dump", CTLTYPE_STRUCT }, \
 325         { "flags", CTLTYPE_STRUCT }, \
 326         { "iflist", CTLTYPE_STRUCT }, \
 327 }
 328
 329 /*
 330  * Maximum queue length specifiable by listen.
 331  */
 332 #define SOMAXCONN       128
 333
 334 /*
 335  * Maximum setsockopt buffer size
 336  */
 337 #define SOMAXOPT_SIZE   65536
 338
 339 /*
 340  * Message header for recvmsg and sendmsg calls.
 341  * Used value-result for recvmsg, value only for sendmsg.
 342  */
 343 struct msghdr {
 344         void            *msg_name;              /* optional address */
 345         socklen_t        msg_namelen;           /* size of address */
 346         struct iovec    *msg_iov;               /* scatter/gather array */
 347         int              msg_iovlen;            /* # elements in msg_iov */
 348         void            *msg_control;           /* ancillary data, see below */
 349         socklen_t        msg_controllen;        /* ancillary data buffer len */
 350         int              msg_flags;             /* flags on received message */
 351 };
 352
 353 #define MSG_OOB         0x00000001      /* process out-of-band data */
 354 #define MSG_PEEK        0x00000002      /* peek at incoming message */
 355 #define MSG_DONTROUTE   0x00000004      /* send without using routing tables */
 356 #define MSG_EOR         0x00000008      /* data completes record */
 357 #define MSG_TRUNC       0x00000010      /* data discarded before delivery */
 358 #define MSG_CTRUNC      0x00000020      /* control data lost before delivery */
 359 #define MSG_WAITALL     0x00000040      /* wait for full request or error */
 360 #define MSG_DONTWAIT    0x00000080      /* this message should be nonblocking */
 361 #define MSG_EOF         0x00000100      /* data completes connection */
 362 #define MSG_NOTIFICATION 0x00000200     /* notification message */
 363
 364 /*
 365  * These override FIONBIO.  MSG_FNONBLOCKING is functionally equivalent to
 366  * MSG_DONTWAIT.
 367  */
 368 #define MSG_FBLOCKING   0x00010000      /* force blocking operation */
 369 #define MSG_FNONBLOCKING 0x00020000     /* force non-blocking operation */
 370
 371 #define MSG_FMASK       0xFFFF0000      /* force mask */
 372
 373 /*
 374  * Header for ancillary data objects in msg_control buffer.
 375  * Used for additional information with/about a datagram
 376  * not expressible by flags.  The format is a sequence
 377  * of message elements headed by cmsghdr structures.
 378  */
 379 struct cmsghdr {
 380         socklen_t       cmsg_len;               /* data byte count, including hdr */
 381         int             cmsg_level;             /* originating protocol */
 382         int             cmsg_type;              /* protocol-specific type */
 383 /* followed by  u_char  cmsg_data[]; */
 384 };
 385
 386 /*
 387  * While we may have more groups than this, the cmsgcred struct must
 388  * be able to fit in an mbuf, and NGROUPS_MAX is too large to allow
 389  * this.
 390 */
 391 #define CMGROUP_MAX 16
 392
 393 /*
 394  * Credentials structure, used to verify the identity of a peer
 395  * process that has sent us a message. This is allocated by the
 396  * peer process but filled in by the kernel. This prevents the
 397  * peer from lying about its identity. (Note that cmcred_groups[0]
 398  * is the effective GID.)
 399  */
 400 struct cmsgcred {
 401         pid_t   cmcred_pid;             /* PID of sending process */
 402         uid_t   cmcred_uid;             /* real UID of sending process */
 403         uid_t   cmcred_euid;            /* effective UID of sending process */
 404         gid_t   cmcred_gid;             /* real GID of sending process */
 405         short   cmcred_ngroups;         /* number or groups */
 406         gid_t   cmcred_groups[CMGROUP_MAX];     /* groups */
 407 };
 408
 409 /* given pointer to struct cmsghdr, return pointer to data */
 410 #define CMSG_DATA(cmsg)         ((unsigned char *)(cmsg) + \
 411                                  _ALIGN(sizeof(struct cmsghdr)))
 412
 413 /* given pointer to struct cmsghdr, return pointer to next cmsghdr */
 414 #define CMSG_NXTHDR(mhdr, cmsg) \
 415         (((caddr_t)(cmsg) + _ALIGN((cmsg)->cmsg_len) + \
 416           _ALIGN(sizeof(struct cmsghdr)) > \
 417             (caddr_t)(mhdr)->msg_control + (mhdr)->msg_controllen) ? \
 418             NULL : \
 419             (struct cmsghdr *)((caddr_t)(cmsg) + _ALIGN((cmsg)->cmsg_len)))
 420
 421 /*
 422  * RFC 2292 requires to check msg_controllen, in case that the kernel returns
 423  * an empty list for some reasons.
 424  */
 425 #define CMSG_FIRSTHDR(mhdr) \
 426         ((mhdr)->msg_controllen >= sizeof(struct cmsghdr) ? \
 427          (struct cmsghdr *)(mhdr)->msg_control : \
 428          NULL)
 429
 430 /* RFC 2292 additions */
 431
 432 #define CMSG_SPACE(l)           (_ALIGN(sizeof(struct cmsghdr)) + _ALIGN(l))
 433 #define CMSG_LEN(l)             (_ALIGN(sizeof(struct cmsghdr)) + (l))
 434
 435 #ifdef _KERNEL
 436 #define CMSG_ALIGN(n)   _ALIGN(n)
 437 #endif
 438
 439 /* "Socket"-level control message types: */
 440 #define SCM_RIGHTS      0x01            /* access rights (array of int) */
 441 #define SCM_TIMESTAMP   0x02            /* timestamp (struct timeval) */
 442 #define SCM_CREDS       0x03            /* process creds (struct cmsgcred) */
 443
 444 /*
 445  * howto arguments for shutdown(2), specified by Posix.1g.
 446  */
 447 #define SHUT_RD         0               /* shut down the reading side */
 448 #define SHUT_WR         1               /* shut down the writing side */
 449 #define SHUT_RDWR       2               /* shut down both sides */
 450
 451 /*
 452  * sendfile(2) header/trailer struct
 453  */
 454 struct sf_hdtr {
 455         struct iovec *headers;  /* pointer to an array of header struct iovec's */
 456         int hdr_cnt;            /* number of header iovec's */
 457         struct iovec *trailers; /* pointer to an array of trailer struct iovec's */
 458         int trl_cnt;            /* number of trailer iovec's */
 459 };
 460
 461 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
 462
 463 #ifndef _SYS_CDEFS_H_
 464 #include <sys/cdefs.h>
 465 #endif
 466
 467 __BEGIN_DECLS
 468 int     accept (int, struct sockaddr *, socklen_t *);
 469 int     extaccept (int, int, struct sockaddr *, socklen_t *);
 470 int     bind (int, const struct sockaddr *, socklen_t);
 471 int     connect (int, const struct sockaddr *, socklen_t);
 472 int     extconnect (int, int, struct sockaddr *, socklen_t);
 473 int     getpeername (int, struct sockaddr *, socklen_t *);
 474 int     getsockname (int, struct sockaddr *, socklen_t *);
 475 int     getsockopt (int, int, int, void *, socklen_t *);
 476 int     listen (int, int);
 477 ssize_t recv (int, void *, size_t, int);
 478 ssize_t recvfrom (int, void *, size_t, int, struct sockaddr *, socklen_t *);
 479 ssize_t recvmsg (int, struct msghdr *, int);
 480 ssize_t send (int, const void *, size_t, int);
 481 ssize_t sendto (int, const void *,
 482             size_t, int, const struct sockaddr *, socklen_t);
 483 ssize_t sendmsg (int, const struct msghdr *, int);
 484 int     sendfile (int, int, off_t, size_t, struct sf_hdtr *, off_t *, int);
 485 int     setsockopt (int, int, int, const void *, socklen_t);
 486 int     shutdown (int, int);
 487 int     socketpair (int, int, int, int *);
 488
 489 void    pfctlinput (int, struct sockaddr *);
 490 __END_DECLS
 491
 492 #endif /* !_KERNEL */
 493
 494 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
 495 #ifndef _SYS_CDEFS_H_
 496 #include <sys/cdefs.h>
 497 #endif
 498
 499 __BEGIN_DECLS
 500 int     socket (int, int, int);
 501 __END_DECLS
 502 #endif  /* !_KERNEL || _KERNEL_VIRTUAL */
 503
 504 #endif /* !_SYS_SOCKET_H_ */