The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/socket.h

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    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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)socket.h    8.4 (Berkeley) 2/21/94
   30  * $FreeBSD: releng/9.0/sys/sys/socket.h 220742 2011-04-17 16:04:39Z jilles $
   31  */
   32 
   33 #ifndef _SYS_SOCKET_H_
   34 #define _SYS_SOCKET_H_
   35 
   36 #include <sys/cdefs.h>
   37 #include <sys/_types.h>
   38 #include <sys/_iovec.h>
   39 #include <machine/_align.h>
   40 
   41 /*
   42  * Definitions related to sockets: types, address families, options.
   43  */
   44 
   45 /*
   46  * Data types.
   47  */
   48 #if __BSD_VISIBLE
   49 #ifndef _GID_T_DECLARED
   50 typedef __gid_t         gid_t;
   51 #define _GID_T_DECLARED
   52 #endif
   53 
   54 #ifndef _OFF_T_DECLARED
   55 typedef __off_t         off_t;
   56 #define _OFF_T_DECLARED
   57 #endif
   58 
   59 #ifndef _PID_T_DECLARED
   60 typedef __pid_t         pid_t;
   61 #define _PID_T_DECLARED
   62 #endif
   63 #endif
   64 
   65 #ifndef _SA_FAMILY_T_DECLARED
   66 typedef __sa_family_t   sa_family_t;
   67 #define _SA_FAMILY_T_DECLARED
   68 #endif
   69 
   70 #ifndef _SOCKLEN_T_DECLARED
   71 typedef __socklen_t     socklen_t;
   72 #define _SOCKLEN_T_DECLARED
   73 #endif
   74  
   75 #ifndef _SSIZE_T_DECLARED
   76 typedef __ssize_t       ssize_t;
   77 #define _SSIZE_T_DECLARED
   78 #endif
   79 
   80 #if __BSD_VISIBLE 
   81 #ifndef _UID_T_DECLARED
   82 typedef __uid_t         uid_t;
   83 #define _UID_T_DECLARED
   84 #endif
   85 #endif
   86 
   87 /*
   88  * Types
   89  */
   90 #define SOCK_STREAM     1               /* stream socket */
   91 #define SOCK_DGRAM      2               /* datagram socket */
   92 #define SOCK_RAW        3               /* raw-protocol interface */
   93 #if __BSD_VISIBLE
   94 #define SOCK_RDM        4               /* reliably-delivered message */
   95 #endif
   96 #define SOCK_SEQPACKET  5               /* sequenced packet stream */
   97 
   98 /*
   99  * Option flags per-socket.
  100  */
  101 #define SO_DEBUG        0x0001          /* turn on debugging info recording */
  102 #define SO_ACCEPTCONN   0x0002          /* socket has had listen() */
  103 #define SO_REUSEADDR    0x0004          /* allow local address reuse */
  104 #define SO_KEEPALIVE    0x0008          /* keep connections alive */
  105 #define SO_DONTROUTE    0x0010          /* just use interface addresses */
  106 #define SO_BROADCAST    0x0020          /* permit sending of broadcast msgs */
  107 #if __BSD_VISIBLE
  108 #define SO_USELOOPBACK  0x0040          /* bypass hardware when possible */
  109 #endif
  110 #define SO_LINGER       0x0080          /* linger on close if data present */
  111 #define SO_OOBINLINE    0x0100          /* leave received OOB data in line */
  112 #if __BSD_VISIBLE
  113 #define SO_REUSEPORT    0x0200          /* allow local address & port reuse */
  114 #define SO_TIMESTAMP    0x0400          /* timestamp received dgram traffic */
  115 #define SO_NOSIGPIPE    0x0800          /* no SIGPIPE from EPIPE */
  116 #define SO_ACCEPTFILTER 0x1000          /* there is an accept filter */
  117 #define SO_BINTIME      0x2000          /* timestamp received dgram traffic */
  118 #endif
  119 #define SO_NO_OFFLOAD   0x4000          /* socket cannot be offloaded */
  120 #define SO_NO_DDP       0x8000          /* disable direct data placement */
  121 
  122 /*
  123  * Additional options, not kept in so_options.
  124  */
  125 #define SO_SNDBUF       0x1001          /* send buffer size */
  126 #define SO_RCVBUF       0x1002          /* receive buffer size */
  127 #define SO_SNDLOWAT     0x1003          /* send low-water mark */
  128 #define SO_RCVLOWAT     0x1004          /* receive low-water mark */
  129 #define SO_SNDTIMEO     0x1005          /* send timeout */
  130 #define SO_RCVTIMEO     0x1006          /* receive timeout */
  131 #define SO_ERROR        0x1007          /* get error status and clear */
  132 #define SO_TYPE         0x1008          /* get socket type */
  133 #if __BSD_VISIBLE
  134 #define SO_LABEL        0x1009          /* socket's MAC label */
  135 #define SO_PEERLABEL    0x1010          /* socket's peer's MAC label */
  136 #define SO_LISTENQLIMIT 0x1011          /* socket's backlog limit */
  137 #define SO_LISTENQLEN   0x1012          /* socket's complete queue length */
  138 #define SO_LISTENINCQLEN        0x1013  /* socket's incomplete queue length */
  139 #define SO_SETFIB       0x1014          /* use this FIB to route */
  140 #define SO_USER_COOKIE  0x1015          /* user cookie (dummynet etc.) */
  141 #endif
  142 
  143 /*
  144  * Structure used for manipulating linger option.
  145  */
  146 struct linger {
  147         int     l_onoff;                /* option on/off */
  148         int     l_linger;               /* linger time */
  149 };
  150 
  151 #if __BSD_VISIBLE
  152 struct accept_filter_arg {
  153         char    af_name[16];
  154         char    af_arg[256-16];
  155 };
  156 #endif
  157 
  158 /*
  159  * Level number for (get/set)sockopt() to apply to socket itself.
  160  */
  161 #define SOL_SOCKET      0xffff          /* options for socket level */
  162 
  163 /*
  164  * Address families.
  165  */
  166 #define AF_UNSPEC       0               /* unspecified */
  167 #if __BSD_VISIBLE
  168 #define AF_LOCAL        AF_UNIX         /* local to host (pipes, portals) */
  169 #endif
  170 #define AF_UNIX         1               /* standardized name for AF_LOCAL */
  171 #define AF_INET         2               /* internetwork: UDP, TCP, etc. */
  172 #if __BSD_VISIBLE
  173 #define AF_IMPLINK      3               /* arpanet imp addresses */
  174 #define AF_PUP          4               /* pup protocols: e.g. BSP */
  175 #define AF_CHAOS        5               /* mit CHAOS protocols */
  176 #define AF_NETBIOS      6               /* SMB protocols */
  177 #define AF_ISO          7               /* ISO protocols */
  178 #define AF_OSI          AF_ISO
  179 #define AF_ECMA         8               /* European computer manufacturers */
  180 #define AF_DATAKIT      9               /* datakit protocols */
  181 #define AF_CCITT        10              /* CCITT protocols, X.25 etc */
  182 #define AF_SNA          11              /* IBM SNA */
  183 #define AF_DECnet       12              /* DECnet */
  184 #define AF_DLI          13              /* DEC Direct data link interface */
  185 #define AF_LAT          14              /* LAT */
  186 #define AF_HYLINK       15              /* NSC Hyperchannel */
  187 #define AF_APPLETALK    16              /* Apple Talk */
  188 #define AF_ROUTE        17              /* Internal Routing Protocol */
  189 #define AF_LINK         18              /* Link layer interface */
  190 #define pseudo_AF_XTP   19              /* eXpress Transfer Protocol (no AF) */
  191 #define AF_COIP         20              /* connection-oriented IP, aka ST II */
  192 #define AF_CNT          21              /* Computer Network Technology */
  193 #define pseudo_AF_RTIP  22              /* Help Identify RTIP packets */
  194 #define AF_IPX          23              /* Novell Internet Protocol */
  195 #define AF_SIP          24              /* Simple Internet Protocol */
  196 #define pseudo_AF_PIP   25              /* Help Identify PIP packets */
  197 #define AF_ISDN         26              /* Integrated Services Digital Network*/
  198 #define AF_E164         AF_ISDN         /* CCITT E.164 recommendation */
  199 #define pseudo_AF_KEY   27              /* Internal key-management function */
  200 #endif
  201 #define AF_INET6        28              /* IPv6 */
  202 #if __BSD_VISIBLE
  203 #define AF_NATM         29              /* native ATM access */
  204 #define AF_ATM          30              /* ATM */
  205 #define pseudo_AF_HDRCMPLT 31           /* Used by BPF to not rewrite headers
  206                                          * in interface output routine
  207                                          */
  208 #define AF_NETGRAPH     32              /* Netgraph sockets */
  209 #define AF_SLOW         33              /* 802.3ad slow protocol */
  210 #define AF_SCLUSTER     34              /* Sitara cluster protocol */
  211 #define AF_ARP          35
  212 #define AF_BLUETOOTH    36              /* Bluetooth sockets */
  213 #define AF_IEEE80211    37              /* IEEE 802.11 protocol */
  214 #define AF_MAX          38
  215 /*
  216  * When allocating a new AF_ constant, please only allocate
  217  * even numbered constants for FreeBSD until 134 as odd numbered AF_
  218  * constants 39-133 are now reserved for vendors.
  219  */
  220 #define AF_VENDOR00 39
  221 #define AF_VENDOR01 41
  222 #define AF_VENDOR02 43
  223 #define AF_VENDOR03 45
  224 #define AF_VENDOR04 47
  225 #define AF_VENDOR05 49
  226 #define AF_VENDOR06 51
  227 #define AF_VENDOR07 53
  228 #define AF_VENDOR08 55
  229 #define AF_VENDOR09 57
  230 #define AF_VENDOR10 59
  231 #define AF_VENDOR11 61
  232 #define AF_VENDOR12 63
  233 #define AF_VENDOR13 65
  234 #define AF_VENDOR14 67
  235 #define AF_VENDOR15 69
  236 #define AF_VENDOR16 71
  237 #define AF_VENDOR17 73
  238 #define AF_VENDOR18 75
  239 #define AF_VENDOR19 77
  240 #define AF_VENDOR20 79
  241 #define AF_VENDOR21 81
  242 #define AF_VENDOR22 83
  243 #define AF_VENDOR23 85
  244 #define AF_VENDOR24 87
  245 #define AF_VENDOR25 89
  246 #define AF_VENDOR26 91
  247 #define AF_VENDOR27 93
  248 #define AF_VENDOR28 95
  249 #define AF_VENDOR29 97
  250 #define AF_VENDOR30 99
  251 #define AF_VENDOR31 101
  252 #define AF_VENDOR32 103
  253 #define AF_VENDOR33 105
  254 #define AF_VENDOR34 107
  255 #define AF_VENDOR35 109
  256 #define AF_VENDOR36 111
  257 #define AF_VENDOR37 113
  258 #define AF_VENDOR38 115
  259 #define AF_VENDOR39 117
  260 #define AF_VENDOR40 119
  261 #define AF_VENDOR41 121
  262 #define AF_VENDOR42 123
  263 #define AF_VENDOR43 125
  264 #define AF_VENDOR44 127
  265 #define AF_VENDOR45 129
  266 #define AF_VENDOR46 131
  267 #define AF_VENDOR47 133
  268 #endif
  269 
  270 /*
  271  * Structure used by kernel to store most
  272  * addresses.
  273  */
  274 struct sockaddr {
  275         unsigned char   sa_len;         /* total length */
  276         sa_family_t     sa_family;      /* address family */
  277         char            sa_data[14];    /* actually longer; address value */
  278 };
  279 #if __BSD_VISIBLE
  280 #define SOCK_MAXADDRLEN 255             /* longest possible addresses */
  281 
  282 /*
  283  * Structure used by kernel to pass protocol
  284  * information in raw sockets.
  285  */
  286 struct sockproto {
  287         unsigned short  sp_family;              /* address family */
  288         unsigned short  sp_protocol;            /* protocol */
  289 };
  290 #endif
  291 
  292 #include <sys/_sockaddr_storage.h>
  293 
  294 #if __BSD_VISIBLE
  295 /*
  296  * Protocol families, same as address families for now.
  297  */
  298 #define PF_UNSPEC       AF_UNSPEC
  299 #define PF_LOCAL        AF_LOCAL
  300 #define PF_UNIX         PF_LOCAL        /* backward compatibility */
  301 #define PF_INET         AF_INET
  302 #define PF_IMPLINK      AF_IMPLINK
  303 #define PF_PUP          AF_PUP
  304 #define PF_CHAOS        AF_CHAOS
  305 #define PF_NETBIOS      AF_NETBIOS
  306 #define PF_ISO          AF_ISO
  307 #define PF_OSI          AF_ISO
  308 #define PF_ECMA         AF_ECMA
  309 #define PF_DATAKIT      AF_DATAKIT
  310 #define PF_CCITT        AF_CCITT
  311 #define PF_SNA          AF_SNA
  312 #define PF_DECnet       AF_DECnet
  313 #define PF_DLI          AF_DLI
  314 #define PF_LAT          AF_LAT
  315 #define PF_HYLINK       AF_HYLINK
  316 #define PF_APPLETALK    AF_APPLETALK
  317 #define PF_ROUTE        AF_ROUTE
  318 #define PF_LINK         AF_LINK
  319 #define PF_XTP          pseudo_AF_XTP   /* really just proto family, no AF */
  320 #define PF_COIP         AF_COIP
  321 #define PF_CNT          AF_CNT
  322 #define PF_SIP          AF_SIP
  323 #define PF_IPX          AF_IPX
  324 #define PF_RTIP         pseudo_AF_RTIP  /* same format as AF_INET */
  325 #define PF_PIP          pseudo_AF_PIP
  326 #define PF_ISDN         AF_ISDN
  327 #define PF_KEY          pseudo_AF_KEY
  328 #define PF_INET6        AF_INET6
  329 #define PF_NATM         AF_NATM
  330 #define PF_ATM          AF_ATM
  331 #define PF_NETGRAPH     AF_NETGRAPH
  332 #define PF_SLOW         AF_SLOW
  333 #define PF_SCLUSTER     AF_SCLUSTER
  334 #define PF_ARP          AF_ARP
  335 #define PF_BLUETOOTH    AF_BLUETOOTH
  336 
  337 #define PF_MAX          AF_MAX
  338 
  339 /*
  340  * Definitions for network related sysctl, CTL_NET.
  341  *
  342  * Second level is protocol family.
  343  * Third level is protocol number.
  344  *
  345  * Further levels are defined by the individual families below.
  346  */
  347 #define NET_MAXID       AF_MAX
  348 
  349 #define CTL_NET_NAMES { \
  350         { 0, 0 }, \
  351         { "unix", CTLTYPE_NODE }, \
  352         { "inet", CTLTYPE_NODE }, \
  353         { "implink", CTLTYPE_NODE }, \
  354         { "pup", CTLTYPE_NODE }, \
  355         { "chaos", CTLTYPE_NODE }, \
  356         { "xerox_ns", CTLTYPE_NODE }, \
  357         { "iso", CTLTYPE_NODE }, \
  358         { "emca", CTLTYPE_NODE }, \
  359         { "datakit", CTLTYPE_NODE }, \
  360         { "ccitt", CTLTYPE_NODE }, \
  361         { "ibm_sna", CTLTYPE_NODE }, \
  362         { "decnet", CTLTYPE_NODE }, \
  363         { "dec_dli", CTLTYPE_NODE }, \
  364         { "lat", CTLTYPE_NODE }, \
  365         { "hylink", CTLTYPE_NODE }, \
  366         { "appletalk", CTLTYPE_NODE }, \
  367         { "route", CTLTYPE_NODE }, \
  368         { "link_layer", CTLTYPE_NODE }, \
  369         { "xtp", CTLTYPE_NODE }, \
  370         { "coip", CTLTYPE_NODE }, \
  371         { "cnt", CTLTYPE_NODE }, \
  372         { "rtip", CTLTYPE_NODE }, \
  373         { "ipx", CTLTYPE_NODE }, \
  374         { "sip", CTLTYPE_NODE }, \
  375         { "pip", CTLTYPE_NODE }, \
  376         { "isdn", CTLTYPE_NODE }, \
  377         { "key", CTLTYPE_NODE }, \
  378         { "inet6", CTLTYPE_NODE }, \
  379         { "natm", CTLTYPE_NODE }, \
  380         { "atm", CTLTYPE_NODE }, \
  381         { "hdrcomplete", CTLTYPE_NODE }, \
  382         { "netgraph", CTLTYPE_NODE }, \
  383         { "snp", CTLTYPE_NODE }, \
  384         { "scp", CTLTYPE_NODE }, \
  385 }
  386 
  387 /*
  388  * PF_ROUTE - Routing table
  389  *
  390  * Three additional levels are defined:
  391  *      Fourth: address family, 0 is wildcard
  392  *      Fifth: type of info, defined below
  393  *      Sixth: flag(s) to mask with for NET_RT_FLAGS
  394  */
  395 #define NET_RT_DUMP     1               /* dump; may limit to a.f. */
  396 #define NET_RT_FLAGS    2               /* by flags, e.g. RESOLVING */
  397 #define NET_RT_IFLIST   3               /* survey interface list */
  398 #define NET_RT_IFMALIST 4               /* return multicast address list */
  399 #define NET_RT_MAXID    5
  400 
  401 #define CTL_NET_RT_NAMES { \
  402         { 0, 0 }, \
  403         { "dump", CTLTYPE_STRUCT }, \
  404         { "flags", CTLTYPE_STRUCT }, \
  405         { "iflist", CTLTYPE_STRUCT }, \
  406         { "ifmalist", CTLTYPE_STRUCT }, \
  407 }
  408 #endif /* __BSD_VISIBLE */
  409 
  410 /*
  411  * Maximum queue length specifiable by listen.
  412  */
  413 #define SOMAXCONN       128
  414 
  415 /*
  416  * Message header for recvmsg and sendmsg calls.
  417  * Used value-result for recvmsg, value only for sendmsg.
  418  */
  419 struct msghdr {
  420         void            *msg_name;              /* optional address */
  421         socklen_t        msg_namelen;           /* size of address */
  422         struct iovec    *msg_iov;               /* scatter/gather array */
  423         int              msg_iovlen;            /* # elements in msg_iov */
  424         void            *msg_control;           /* ancillary data, see below */
  425         socklen_t        msg_controllen;        /* ancillary data buffer len */
  426         int              msg_flags;             /* flags on received message */
  427 };
  428 
  429 #define MSG_OOB         0x1             /* process out-of-band data */
  430 #define MSG_PEEK        0x2             /* peek at incoming message */
  431 #define MSG_DONTROUTE   0x4             /* send without using routing tables */
  432 #define MSG_EOR         0x8             /* data completes record */
  433 #define MSG_TRUNC       0x10            /* data discarded before delivery */
  434 #define MSG_CTRUNC      0x20            /* control data lost before delivery */
  435 #define MSG_WAITALL     0x40            /* wait for full request or error */
  436 #define MSG_NOTIFICATION 0x2000         /* SCTP notification */
  437 #if __BSD_VISIBLE
  438 #define MSG_DONTWAIT    0x80            /* this message should be nonblocking */
  439 #define MSG_EOF         0x100           /* data completes connection */
  440 #define MSG_NBIO        0x4000          /* FIONBIO mode, used by fifofs */
  441 #define MSG_COMPAT      0x8000          /* used in sendit() */
  442 #endif
  443 #ifdef _KERNEL
  444 #define MSG_SOCALLBCK   0x10000         /* for use by socket callbacks - soreceive (TCP) */
  445 #endif
  446 #if __BSD_VISIBLE
  447 #define MSG_NOSIGNAL    0x20000         /* do not generate SIGPIPE on EOF */
  448 #endif
  449 
  450 /*
  451  * Header for ancillary data objects in msg_control buffer.
  452  * Used for additional information with/about a datagram
  453  * not expressible by flags.  The format is a sequence
  454  * of message elements headed by cmsghdr structures.
  455  */
  456 struct cmsghdr {
  457         socklen_t       cmsg_len;               /* data byte count, including hdr */
  458         int             cmsg_level;             /* originating protocol */
  459         int             cmsg_type;              /* protocol-specific type */
  460 /* followed by  u_char  cmsg_data[]; */
  461 };
  462 
  463 #if __BSD_VISIBLE
  464 /*
  465  * While we may have more groups than this, the cmsgcred struct must
  466  * be able to fit in an mbuf and we have historically supported a
  467  * maximum of 16 groups.
  468 */
  469 #define CMGROUP_MAX 16
  470 
  471 /*
  472  * Credentials structure, used to verify the identity of a peer
  473  * process that has sent us a message. This is allocated by the
  474  * peer process but filled in by the kernel. This prevents the
  475  * peer from lying about its identity. (Note that cmcred_groups[0]
  476  * is the effective GID.)
  477  */
  478 struct cmsgcred {
  479         pid_t   cmcred_pid;             /* PID of sending process */
  480         uid_t   cmcred_uid;             /* real UID of sending process */
  481         uid_t   cmcred_euid;            /* effective UID of sending process */
  482         gid_t   cmcred_gid;             /* real GID of sending process */
  483         short   cmcred_ngroups;         /* number or groups */
  484         gid_t   cmcred_groups[CMGROUP_MAX];     /* groups */
  485 };
  486 
  487 /*
  488  * Socket credentials.
  489  */
  490 struct sockcred {
  491         uid_t   sc_uid;                 /* real user id */
  492         uid_t   sc_euid;                /* effective user id */
  493         gid_t   sc_gid;                 /* real group id */
  494         gid_t   sc_egid;                /* effective group id */
  495         int     sc_ngroups;             /* number of supplemental groups */
  496         gid_t   sc_groups[1];           /* variable length */
  497 };
  498 
  499 /*
  500  * Compute size of a sockcred structure with groups.
  501  */
  502 #define SOCKCREDSIZE(ngrps) \
  503         (sizeof(struct sockcred) + (sizeof(gid_t) * ((ngrps) - 1)))
  504 
  505 #endif /* __BSD_VISIBLE */
  506 
  507 /* given pointer to struct cmsghdr, return pointer to data */
  508 #define CMSG_DATA(cmsg)         ((unsigned char *)(cmsg) + \
  509                                  _ALIGN(sizeof(struct cmsghdr)))
  510 
  511 /* given pointer to struct cmsghdr, return pointer to next cmsghdr */
  512 #define CMSG_NXTHDR(mhdr, cmsg) \
  513         ((char *)(cmsg) == NULL ? CMSG_FIRSTHDR(mhdr) : \
  514             ((char *)(cmsg) + _ALIGN(((struct cmsghdr *)(cmsg))->cmsg_len) + \
  515           _ALIGN(sizeof(struct cmsghdr)) > \
  516             (char *)(mhdr)->msg_control + (mhdr)->msg_controllen) ? \
  517             (struct cmsghdr *)0 : \
  518             (struct cmsghdr *)(void *)((char *)(cmsg) + \
  519             _ALIGN(((struct cmsghdr *)(cmsg))->cmsg_len)))
  520 
  521 /*
  522  * RFC 2292 requires to check msg_controllen, in case that the kernel returns
  523  * an empty list for some reasons.
  524  */
  525 #define CMSG_FIRSTHDR(mhdr) \
  526         ((mhdr)->msg_controllen >= sizeof(struct cmsghdr) ? \
  527          (struct cmsghdr *)(mhdr)->msg_control : \
  528          (struct cmsghdr *)NULL)
  529 
  530 #if __BSD_VISIBLE
  531 /* RFC 2292 additions */
  532 #define CMSG_SPACE(l)           (_ALIGN(sizeof(struct cmsghdr)) + _ALIGN(l))
  533 #define CMSG_LEN(l)             (_ALIGN(sizeof(struct cmsghdr)) + (l))
  534 #endif
  535 
  536 #ifdef _KERNEL
  537 #define CMSG_ALIGN(n)   _ALIGN(n)
  538 #endif
  539 
  540 /* "Socket"-level control message types: */
  541 #define SCM_RIGHTS      0x01            /* access rights (array of int) */
  542 #if __BSD_VISIBLE
  543 #define SCM_TIMESTAMP   0x02            /* timestamp (struct timeval) */
  544 #define SCM_CREDS       0x03            /* process creds (struct cmsgcred) */
  545 #define SCM_BINTIME     0x04            /* timestamp (struct bintime) */
  546 #endif
  547 
  548 #if __BSD_VISIBLE
  549 /*
  550  * 4.3 compat sockaddr, move to compat file later
  551  */
  552 struct osockaddr {
  553         unsigned short sa_family;       /* address family */
  554         char    sa_data[14];            /* up to 14 bytes of direct address */
  555 };
  556 
  557 /*
  558  * 4.3-compat message header (move to compat file later).
  559  */
  560 struct omsghdr {
  561         char    *msg_name;              /* optional address */
  562         int     msg_namelen;            /* size of address */
  563         struct  iovec *msg_iov;         /* scatter/gather array */
  564         int     msg_iovlen;             /* # elements in msg_iov */
  565         char    *msg_accrights;         /* access rights sent/received */
  566         int     msg_accrightslen;
  567 };
  568 #endif
  569 
  570 /*
  571  * howto arguments for shutdown(2), specified by Posix.1g.
  572  */
  573 #define SHUT_RD         0               /* shut down the reading side */
  574 #define SHUT_WR         1               /* shut down the writing side */
  575 #define SHUT_RDWR       2               /* shut down both sides */
  576 
  577 /* we cheat and use the SHUT_XX defines for these */
  578 #define PRU_FLUSH_RD     SHUT_RD
  579 #define PRU_FLUSH_WR     SHUT_WR
  580 #define PRU_FLUSH_RDWR   SHUT_RDWR
  581 
  582 
  583 #if __BSD_VISIBLE
  584 /*
  585  * sendfile(2) header/trailer struct
  586  */
  587 struct sf_hdtr {
  588         struct iovec *headers;  /* pointer to an array of header struct iovec's */
  589         int hdr_cnt;            /* number of header iovec's */
  590         struct iovec *trailers; /* pointer to an array of trailer struct iovec's */
  591         int trl_cnt;            /* number of trailer iovec's */
  592 };
  593 
  594 /*
  595  * Sendfile-specific flag(s)
  596  */
  597 #define SF_NODISKIO     0x00000001
  598 #define SF_MNOWAIT      0x00000002
  599 #define SF_SYNC         0x00000004
  600 #endif
  601 
  602 #ifndef _KERNEL
  603 
  604 #include <sys/cdefs.h>
  605 
  606 __BEGIN_DECLS
  607 int     accept(int, struct sockaddr * __restrict, socklen_t * __restrict);
  608 int     bind(int, const struct sockaddr *, socklen_t);
  609 int     connect(int, const struct sockaddr *, socklen_t);
  610 int     getpeername(int, struct sockaddr * __restrict, socklen_t * __restrict);
  611 int     getsockname(int, struct sockaddr * __restrict, socklen_t * __restrict);
  612 int     getsockopt(int, int, int, void * __restrict, socklen_t * __restrict);
  613 int     listen(int, int);
  614 ssize_t recv(int, void *, size_t, int);
  615 ssize_t recvfrom(int, void *, size_t, int, struct sockaddr * __restrict, socklen_t * __restrict);
  616 ssize_t recvmsg(int, struct msghdr *, int);
  617 ssize_t send(int, const void *, size_t, int);
  618 ssize_t sendto(int, const void *,
  619             size_t, int, const struct sockaddr *, socklen_t);
  620 ssize_t sendmsg(int, const struct msghdr *, int);
  621 #if __BSD_VISIBLE
  622 int     sendfile(int, int, off_t, size_t, struct sf_hdtr *, off_t *, int);
  623 int     setfib(int);
  624 #endif
  625 int     setsockopt(int, int, int, const void *, socklen_t);
  626 int     shutdown(int, int);
  627 int     sockatmark(int);
  628 int     socket(int, int, int);
  629 int     socketpair(int, int, int, int *);
  630 __END_DECLS
  631 
  632 #endif /* !_KERNEL */
  633 
  634 #ifdef _KERNEL
  635 struct socket;
  636 
  637 struct tcpcb *so_sototcpcb(struct socket *so);
  638 struct inpcb *so_sotoinpcb(struct socket *so);
  639 struct sockbuf *so_sockbuf_snd(struct socket *);
  640 struct sockbuf *so_sockbuf_rcv(struct socket *);
  641 
  642 int so_state_get(const struct socket *);
  643 void so_state_set(struct socket *, int);
  644 
  645 int so_options_get(const struct socket *);
  646 void so_options_set(struct socket *, int);
  647 
  648 int so_error_get(const struct socket *);
  649 void so_error_set(struct socket *, int);
  650 
  651 int so_linger_get(const struct socket *);
  652 void so_linger_set(struct socket *, int);
  653 
  654 struct protosw *so_protosw_get(const struct socket *);
  655 void so_protosw_set(struct socket *, struct protosw *);
  656 
  657 void so_sorwakeup_locked(struct socket *so);
  658 void so_sowwakeup_locked(struct socket *so);
  659 
  660 void so_sorwakeup(struct socket *so);
  661 void so_sowwakeup(struct socket *so);
  662 
  663 void so_lock(struct socket *so);
  664 void so_unlock(struct socket *so);
  665 
  666 void so_listeners_apply_all(struct socket *so, void (*func)(struct socket *, void *), void *arg);
  667 
  668 #endif
  669 
  670 
  671 #endif /* !_SYS_SOCKET_H_ */

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