FreeBSD/Linux Kernel Cross Reference
sys/sys/socket.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1982, 1985, 1986, 1988, 1993, 1994
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)socket.h    8.4 (Berkeley) 2/21/94
     * $FreeBSD$
     */
    
    #ifndef _SYS_SOCKET_H_
    #define _SYS_SOCKET_H_
    
    #include <sys/cdefs.h>
    #include <sys/_types.h>
    #include <sys/_iovec.h>
    #include <machine/_align.h>
    
    /*
     * Definitions related to sockets: types, address families, options.
     */
    
    /*
     * Data types.
     */
    #if __BSD_VISIBLE
    #ifndef _GID_T_DECLARED
    typedef __gid_t         gid_t;
    #define _GID_T_DECLARED
    #endif
    
    #ifndef _OFF_T_DECLARED
    typedef __off_t         off_t;
    #define _OFF_T_DECLARED
    #endif
    
    #ifndef _PID_T_DECLARED
    typedef __pid_t         pid_t;
    #define _PID_T_DECLARED
    #endif
    #endif
    
    #ifndef _SA_FAMILY_T_DECLARED
    typedef __sa_family_t   sa_family_t;
    #define _SA_FAMILY_T_DECLARED
    #endif
    
    #ifndef _SOCKLEN_T_DECLARED
    typedef __socklen_t     socklen_t;
    #define _SOCKLEN_T_DECLARED
    #endif
    
    #ifndef _SSIZE_T_DECLARED
    typedef __ssize_t       ssize_t;
    #define _SSIZE_T_DECLARED
    #endif
    
    #if __BSD_VISIBLE 
    #ifndef _UID_T_DECLARED
    typedef __uid_t         uid_t;
    #define _UID_T_DECLARED
    #endif
    #endif
    
    #ifndef _UINT32_T_DECLARED
    typedef __uint32_t      uint32_t;
    #define _UINT32_T_DECLARED
    #endif
    
    #ifndef _UINTPTR_T_DECLARED
    typedef __uintptr_t     uintptr_t;
    #define _UINTPTR_T_DECLARED
    #endif
    
    /*
    * Types
    */
   #define SOCK_STREAM     1               /* stream socket */
   #define SOCK_DGRAM      2               /* datagram socket */
   #define SOCK_RAW        3               /* raw-protocol interface */
   #if __BSD_VISIBLE
   #define SOCK_RDM        4               /* reliably-delivered message */
   #endif
   #define SOCK_SEQPACKET  5               /* sequenced packet stream */
   
   #if __BSD_VISIBLE
   /*
    * Creation flags, OR'ed into socket() and socketpair() type argument.
    */
   #define SOCK_CLOEXEC    0x10000000
   #define SOCK_NONBLOCK   0x20000000
   #ifdef _KERNEL
   /*
    * Flags for accept1(), kern_accept4() and solisten_dequeue, in addition
    * to SOCK_CLOEXEC and SOCK_NONBLOCK.
    */
   #define ACCEPT4_INHERIT 0x1
   #define ACCEPT4_COMPAT  0x2
   #endif  /* _KERNEL */
   #endif  /* __BSD_VISIBLE */
   
   /*
    * Option flags per-socket.
    */
   #define SO_DEBUG        0x00000001      /* turn on debugging info recording */
   #define SO_ACCEPTCONN   0x00000002      /* socket has had listen() */
   #define SO_REUSEADDR    0x00000004      /* allow local address reuse */
   #define SO_KEEPALIVE    0x00000008      /* keep connections alive */
   #define SO_DONTROUTE    0x00000010      /* just use interface addresses */
   #define SO_BROADCAST    0x00000020      /* permit sending of broadcast msgs */
   #if __BSD_VISIBLE
   #define SO_USELOOPBACK  0x00000040      /* bypass hardware when possible */
   #endif
   #define SO_LINGER       0x00000080      /* linger on close if data present */
   #define SO_OOBINLINE    0x00000100      /* leave received OOB data in line */
   #if __BSD_VISIBLE
   #define SO_REUSEPORT    0x00000200      /* allow local address & port reuse */
   #define SO_TIMESTAMP    0x00000400      /* timestamp received dgram traffic */
   #define SO_NOSIGPIPE    0x00000800      /* no SIGPIPE from EPIPE */
   #define SO_ACCEPTFILTER 0x00001000      /* there is an accept filter */
   #define SO_BINTIME      0x00002000      /* timestamp received dgram traffic */
   #endif
   #define SO_NO_OFFLOAD   0x00004000      /* socket cannot be offloaded */
   #define SO_NO_DDP       0x00008000      /* disable direct data placement */
   #define SO_REUSEPORT_LB 0x00010000      /* reuse with load balancing */
   #define SO_RERROR       0x00020000      /* keep track of receive errors */
   
   /*
    * Additional options, not kept in so_options.
    */
   #define SO_SNDBUF       0x1001          /* send buffer size */
   #define SO_RCVBUF       0x1002          /* receive buffer size */
   #define SO_SNDLOWAT     0x1003          /* send low-water mark */
   #define SO_RCVLOWAT     0x1004          /* receive low-water mark */
   #define SO_SNDTIMEO     0x1005          /* send timeout */
   #define SO_RCVTIMEO     0x1006          /* receive timeout */
   #define SO_ERROR        0x1007          /* get error status and clear */
   #define SO_TYPE         0x1008          /* get socket type */
   #if __BSD_VISIBLE
   #define SO_LABEL        0x1009          /* socket's MAC label */
   #define SO_PEERLABEL    0x1010          /* socket's peer's MAC label */
   #define SO_LISTENQLIMIT 0x1011          /* socket's backlog limit */
   #define SO_LISTENQLEN   0x1012          /* socket's complete queue length */
   #define SO_LISTENINCQLEN        0x1013  /* socket's incomplete queue length */
   #define SO_SETFIB       0x1014          /* use this FIB to route */
   #define SO_USER_COOKIE  0x1015          /* user cookie (dummynet etc.) */
   #define SO_PROTOCOL     0x1016          /* get socket protocol (Linux name) */
   #define SO_PROTOTYPE    SO_PROTOCOL     /* alias for SO_PROTOCOL (SunOS name) */
   #define SO_TS_CLOCK     0x1017          /* clock type used for SO_TIMESTAMP */
   #define SO_MAX_PACING_RATE      0x1018  /* socket's max TX pacing rate (Linux name) */
   #define SO_DOMAIN       0x1019          /* get socket domain */
   #endif
   
   #if __BSD_VISIBLE
   #define SO_TS_REALTIME_MICRO    0       /* microsecond resolution, realtime */
   #define SO_TS_BINTIME           1       /* sub-nanosecond resolution, realtime */
   #define SO_TS_REALTIME          2       /* nanosecond resolution, realtime */
   #define SO_TS_MONOTONIC         3       /* nanosecond resolution, monotonic */
   #define SO_TS_DEFAULT           SO_TS_REALTIME_MICRO
   #define SO_TS_CLOCK_MAX         SO_TS_MONOTONIC
   #endif
   
   /*
    * Space reserved for new socket options added by third-party vendors.
    * This range applies to all socket option levels.  New socket options
    * in FreeBSD should always use an option value less than SO_VENDOR.
    */
   #if __BSD_VISIBLE
   #define SO_VENDOR       0x80000000
   #endif
   
   /*
    * Structure used for manipulating linger option.
    */
   struct linger {
           int     l_onoff;                /* option on/off */
           int     l_linger;               /* linger time */
   };
   
   #if __BSD_VISIBLE
   struct accept_filter_arg {
           char    af_name[16];
           char    af_arg[256-16];
   };
   #endif
   
   /*
    * Level number for (get/set)sockopt() to apply to socket itself.
    */
   #define SOL_SOCKET      0xffff          /* options for socket level */
   
   /*
    * Address families.
    */
   #define AF_UNSPEC       0               /* unspecified */
   #if __BSD_VISIBLE
   #define AF_LOCAL        AF_UNIX         /* local to host (pipes, portals) */
   #endif
   #define AF_UNIX         1               /* standardized name for AF_LOCAL */
   #define AF_INET         2               /* internetwork: UDP, TCP, etc. */
   #if __BSD_VISIBLE
   #define AF_IMPLINK      3               /* arpanet imp addresses */
   #define AF_PUP          4               /* pup protocols: e.g. BSP */
   #define AF_CHAOS        5               /* mit CHAOS protocols */
   #define AF_NETBIOS      6               /* SMB protocols */
   #define AF_ISO          7               /* ISO protocols */
   #define AF_OSI          AF_ISO
   #define AF_ECMA         8               /* European computer manufacturers */
   #define AF_DATAKIT      9               /* datakit protocols */
   #define AF_CCITT        10              /* CCITT protocols, X.25 etc */
   #define AF_SNA          11              /* IBM SNA */
   #define AF_DECnet       12              /* DECnet */
   #define AF_DLI          13              /* DEC Direct data link interface */
   #define AF_LAT          14              /* LAT */
   #define AF_HYLINK       15              /* NSC Hyperchannel */
   #define AF_APPLETALK    16              /* Apple Talk */
   #define AF_ROUTE        17              /* Internal Routing Protocol */
   #define AF_LINK         18              /* Link layer interface */
   #define pseudo_AF_XTP   19              /* eXpress Transfer Protocol (no AF) */
   #define AF_COIP         20              /* connection-oriented IP, aka ST II */
   #define AF_CNT          21              /* Computer Network Technology */
   #define pseudo_AF_RTIP  22              /* Help Identify RTIP packets */
   #define AF_IPX          23              /* Novell Internet Protocol */
   #define AF_SIP          24              /* Simple Internet Protocol */
   #define pseudo_AF_PIP   25              /* Help Identify PIP packets */
   #define AF_ISDN         26              /* Integrated Services Digital Network*/
   #define AF_E164         AF_ISDN         /* CCITT E.164 recommendation */
   #define pseudo_AF_KEY   27              /* Internal key-management function */
   #endif
   #define AF_INET6        28              /* IPv6 */
   #if __BSD_VISIBLE
   #define AF_NATM         29              /* native ATM access */
   #define AF_ATM          30              /* ATM */
   #define pseudo_AF_HDRCMPLT 31           /* Used by BPF to not rewrite headers
                                            * in interface output routine
                                            */
   #define AF_NETGRAPH     32              /* Netgraph sockets */
   #define AF_SLOW         33              /* 802.3ad slow protocol */
   #define AF_SCLUSTER     34              /* Sitara cluster protocol */
   #define AF_ARP          35
   #define AF_BLUETOOTH    36              /* Bluetooth sockets */
   #define AF_IEEE80211    37              /* IEEE 802.11 protocol */
   #define AF_NETLINK      38              /* Netlink protocol */
   #define AF_INET_SDP     40              /* OFED Socket Direct Protocol ipv4 */
   #define AF_INET6_SDP    42              /* OFED Socket Direct Protocol ipv6 */
   #define AF_HYPERV       43              /* HyperV sockets */
   #define AF_DIVERT       44              /* divert(4) */
   #define AF_MAX          44
   /*
    * When allocating a new AF_ constant, please only allocate
    * even numbered constants for FreeBSD until 134 as odd numbered AF_
    * constants 39-133 are now reserved for vendors.
    */
   #define AF_VENDOR00 39
   #define AF_VENDOR01 41
   #define AF_VENDOR03 45
   #define AF_VENDOR04 47
   #define AF_VENDOR05 49
   #define AF_VENDOR06 51
   #define AF_VENDOR07 53
   #define AF_VENDOR08 55
   #define AF_VENDOR09 57
   #define AF_VENDOR10 59
   #define AF_VENDOR11 61
   #define AF_VENDOR12 63
   #define AF_VENDOR13 65
   #define AF_VENDOR14 67
   #define AF_VENDOR15 69
   #define AF_VENDOR16 71
   #define AF_VENDOR17 73
   #define AF_VENDOR18 75
   #define AF_VENDOR19 77
   #define AF_VENDOR20 79
   #define AF_VENDOR21 81
   #define AF_VENDOR22 83
   #define AF_VENDOR23 85
   #define AF_VENDOR24 87
   #define AF_VENDOR25 89
   #define AF_VENDOR26 91
   #define AF_VENDOR27 93
   #define AF_VENDOR28 95
   #define AF_VENDOR29 97
   #define AF_VENDOR30 99
   #define AF_VENDOR31 101
   #define AF_VENDOR32 103
   #define AF_VENDOR33 105
   #define AF_VENDOR34 107
   #define AF_VENDOR35 109
   #define AF_VENDOR36 111
   #define AF_VENDOR37 113
   #define AF_VENDOR38 115
   #define AF_VENDOR39 117
   #define AF_VENDOR40 119
   #define AF_VENDOR41 121
   #define AF_VENDOR42 123
   #define AF_VENDOR43 125
   #define AF_VENDOR44 127
   #define AF_VENDOR45 129
   #define AF_VENDOR46 131
   #define AF_VENDOR47 133
   #endif
   
   /*
    * Structure used by kernel to store most
    * addresses.
    */
   struct sockaddr {
           unsigned char   sa_len;         /* total length */
           sa_family_t     sa_family;      /* address family */
           char            sa_data[14];    /* actually longer; address value */
   };
   #if __BSD_VISIBLE
   #define SOCK_MAXADDRLEN 255             /* longest possible addresses */
   
   /*
    * Structure used by kernel to pass protocol
    * information in raw sockets.
    */
   struct sockproto {
           unsigned short  sp_family;              /* address family */
           unsigned short  sp_protocol;            /* protocol */
   };
   #endif
   
   #include <sys/_sockaddr_storage.h>
   
   #if __BSD_VISIBLE
   /*
    * Protocol families, same as address families for now.
    */
   #define PF_UNSPEC       AF_UNSPEC
   #define PF_LOCAL        AF_LOCAL
   #define PF_UNIX         PF_LOCAL        /* backward compatibility */
   #define PF_INET         AF_INET
   #define PF_IMPLINK      AF_IMPLINK
   #define PF_PUP          AF_PUP
   #define PF_CHAOS        AF_CHAOS
   #define PF_NETBIOS      AF_NETBIOS
   #define PF_ISO          AF_ISO
   #define PF_OSI          AF_ISO
   #define PF_ECMA         AF_ECMA
   #define PF_DATAKIT      AF_DATAKIT
   #define PF_CCITT        AF_CCITT
   #define PF_SNA          AF_SNA
   #define PF_DECnet       AF_DECnet
   #define PF_DLI          AF_DLI
   #define PF_LAT          AF_LAT
   #define PF_HYLINK       AF_HYLINK
   #define PF_APPLETALK    AF_APPLETALK
   #define PF_ROUTE        AF_ROUTE
   #define PF_LINK         AF_LINK
   #define PF_XTP          pseudo_AF_XTP   /* really just proto family, no AF */
   #define PF_COIP         AF_COIP
   #define PF_CNT          AF_CNT
   #define PF_SIP          AF_SIP
   #define PF_IPX          AF_IPX
   #define PF_RTIP         pseudo_AF_RTIP  /* same format as AF_INET */
   #define PF_PIP          pseudo_AF_PIP
   #define PF_ISDN         AF_ISDN
   #define PF_KEY          pseudo_AF_KEY
   #define PF_INET6        AF_INET6
   #define PF_NATM         AF_NATM
   #define PF_ATM          AF_ATM
   #define PF_NETGRAPH     AF_NETGRAPH
   #define PF_SLOW         AF_SLOW
   #define PF_SCLUSTER     AF_SCLUSTER
   #define PF_ARP          AF_ARP
   #define PF_BLUETOOTH    AF_BLUETOOTH
   #define PF_IEEE80211    AF_IEEE80211
   #define PF_NETLINK      AF_NETLINK
   #define PF_INET_SDP     AF_INET_SDP
   #define PF_INET6_SDP    AF_INET6_SDP
   #define PF_DIVERT       AF_DIVERT
   
   #define PF_MAX          AF_MAX
   
   /*
    * Definitions for network related sysctl, CTL_NET.
    *
    * Second level is protocol family.
    * Third level is protocol number.
    *
    * Further levels are defined by the individual families.
    */
   
   /*
    * PF_ROUTE - Routing table
    *
    * Three additional levels are defined:
    *      Fourth: address family, 0 is wildcard
    *      Fifth: type of info, defined below
    *      Sixth: flag(s) to mask with for NET_RT_FLAGS
    */
   #define NET_RT_DUMP     1               /* dump; may limit to a.f. */
   #define NET_RT_FLAGS    2               /* by flags, e.g. RESOLVING */
   #define NET_RT_IFLIST   3               /* survey interface list */
   #define NET_RT_IFMALIST 4               /* return multicast address list */
   #define NET_RT_IFLISTL  5               /* Survey interface list, using 'l'en
                                            * versions of msghdr structs. */
   #define NET_RT_NHOP     6               /* dump routing nexthops */
   #define NET_RT_NHGRP    7               /* dump routing nexthop groups */
   #endif /* __BSD_VISIBLE */
   
   /*
    * Maximum queue length specifiable by listen.
    */
   #define SOMAXCONN       128
   
   /*
    * Message header for recvmsg and sendmsg calls.
    * Used value-result for recvmsg, value only for sendmsg.
    */
   struct msghdr {
           void            *msg_name;              /* optional address */
           socklen_t        msg_namelen;           /* size of address */
           struct iovec    *msg_iov;               /* scatter/gather array */
           int              msg_iovlen;            /* # elements in msg_iov */
           void            *msg_control;           /* ancillary data, see below */
           socklen_t        msg_controllen;        /* ancillary data buffer len */
           int              msg_flags;             /* flags on received message */
   };
   
   #define MSG_OOB          0x00000001     /* process out-of-band data */
   #define MSG_PEEK         0x00000002     /* peek at incoming message */
   #define MSG_DONTROUTE    0x00000004     /* send without using routing tables */
   #define MSG_EOR          0x00000008     /* data completes record */
   #define MSG_TRUNC        0x00000010     /* data discarded before delivery */
   #define MSG_CTRUNC       0x00000020     /* control data lost before delivery */
   #define MSG_WAITALL      0x00000040     /* wait for full request or error */
   #if __BSD_VISIBLE
   #define MSG_DONTWAIT     0x00000080     /* this message should be nonblocking */
   #define MSG_EOF          0x00000100     /* data completes connection */
   /*                       0x00000200        unused */
   /*                       0x00000400        unused */
   /*                       0x00000800        unused */
   /*                       0x00001000        unused */
   #define MSG_NOTIFICATION 0x00002000     /* SCTP notification */
   #define MSG_NBIO         0x00004000     /* FIONBIO mode, used by fifofs */
   #define MSG_COMPAT       0x00008000             /* used in sendit() */
   #endif
   #ifdef _KERNEL
   #define MSG_SOCALLBCK    0x00010000     /* for use by socket callbacks - soreceive (TCP) */
   #endif
   #if __POSIX_VISIBLE >= 200809
   #define MSG_NOSIGNAL     0x00020000     /* do not generate SIGPIPE on EOF */
   #endif
   #if __BSD_VISIBLE
   #define MSG_CMSG_CLOEXEC 0x00040000     /* make received fds close-on-exec */
   #define MSG_WAITFORONE   0x00080000     /* for recvmmsg() */
   #endif
   #ifdef _KERNEL
   #define MSG_MORETOCOME   0x00100000     /* additional data pending */
   #define MSG_TLSAPPDATA   0x00200000     /* do not soreceive() alert rec. (TLS) */
   #endif
   
   /*
    * Header for ancillary data objects in msg_control buffer.
    * Used for additional information with/about a datagram
    * not expressible by flags.  The format is a sequence
    * of message elements headed by cmsghdr structures.
    */
   struct cmsghdr {
           socklen_t       cmsg_len;               /* data byte count, including hdr */
           int             cmsg_level;             /* originating protocol */
           int             cmsg_type;              /* protocol-specific type */
   /* followed by  u_char  cmsg_data[]; */
   };
   
   #if __BSD_VISIBLE
   /*
    * While we may have more groups than this, the cmsgcred struct must
    * be able to fit in an mbuf and we have historically supported a
    * maximum of 16 groups.
   */
   #define CMGROUP_MAX 16
   
   /*
    * Credentials structure, used to verify the identity of a peer
    * process that has sent us a message. This is allocated by the
    * peer process but filled in by the kernel. This prevents the
    * peer from lying about its identity. (Note that cmcred_groups[0]
    * is the effective GID.)
    */
   struct cmsgcred {
           pid_t   cmcred_pid;             /* PID of sending process */
           uid_t   cmcred_uid;             /* real UID of sending process */
           uid_t   cmcred_euid;            /* effective UID of sending process */
           gid_t   cmcred_gid;             /* real GID of sending process */
           short   cmcred_ngroups;         /* number or groups */
           gid_t   cmcred_groups[CMGROUP_MAX];     /* groups */
   };
   
   /*
    * Socket credentials (LOCAL_CREDS).
    */
   struct sockcred {
           uid_t   sc_uid;                 /* real user id */
           uid_t   sc_euid;                /* effective user id */
           gid_t   sc_gid;                 /* real group id */
           gid_t   sc_egid;                /* effective group id */
           int     sc_ngroups;             /* number of supplemental groups */
           gid_t   sc_groups[1];           /* variable length */
   };
   
   /*
    * Compute size of a sockcred structure with groups.
    */
   #define SOCKCREDSIZE(ngrps) \
           (sizeof(struct sockcred) + (sizeof(gid_t) * ((ngrps) - 1)))
   
   /*
    * Socket credentials (LOCAL_CREDS_PERSISTENT).
    */
   struct sockcred2 {
           int     sc_version;             /* version of this structure */
           pid_t   sc_pid;                 /* PID of sending process */
           uid_t   sc_uid;                 /* real user id */
           uid_t   sc_euid;                /* effective user id */
           gid_t   sc_gid;                 /* real group id */
           gid_t   sc_egid;                /* effective group id */
           int     sc_ngroups;             /* number of supplemental groups */
           gid_t   sc_groups[1];           /* variable length */
   };
   #define SOCKCRED2SIZE(ngrps) \
           (sizeof(struct sockcred2) + (sizeof(gid_t) * ((ngrps) - 1)))
   
   #endif /* __BSD_VISIBLE */
   
   /* given pointer to struct cmsghdr, return pointer to data */
   #define CMSG_DATA(cmsg)         ((unsigned char *)(cmsg) + \
                                    _ALIGN(sizeof(struct cmsghdr)))
   
   /* given pointer to struct cmsghdr, return pointer to next cmsghdr */
   #define CMSG_NXTHDR(mhdr, cmsg) \
           ((char *)(cmsg) == (char *)0 ? CMSG_FIRSTHDR(mhdr) : \
               ((char *)(cmsg) + _ALIGN(((struct cmsghdr *)(cmsg))->cmsg_len) + \
             _ALIGN(sizeof(struct cmsghdr)) > \
               (char *)(mhdr)->msg_control + (mhdr)->msg_controllen) ? \
               (struct cmsghdr *)0 : \
               (struct cmsghdr *)(void *)((char *)(cmsg) + \
               _ALIGN(((struct cmsghdr *)(cmsg))->cmsg_len)))
   
   /*
    * RFC 2292 requires to check msg_controllen, in case that the kernel returns
    * an empty list for some reasons.
    */
   #define CMSG_FIRSTHDR(mhdr) \
           ((mhdr)->msg_controllen >= sizeof(struct cmsghdr) ? \
            (struct cmsghdr *)(mhdr)->msg_control : \
            (struct cmsghdr *)0)
   
   #if __BSD_VISIBLE
   /* RFC 2292 additions */
   #define CMSG_SPACE(l)           (_ALIGN(sizeof(struct cmsghdr)) + _ALIGN(l))
   #define CMSG_LEN(l)             (_ALIGN(sizeof(struct cmsghdr)) + (l))
   #endif
   
   #ifdef _KERNEL
   #define CMSG_ALIGN(n)   _ALIGN(n)
   #endif
   
   /* "Socket"-level control message types: */
   #define SCM_RIGHTS      0x01            /* access rights (array of int) */
   #if __BSD_VISIBLE
   #define SCM_TIMESTAMP   0x02            /* timestamp (struct timeval) */
   #define SCM_CREDS       0x03            /* process creds (struct cmsgcred) */
   #define SCM_BINTIME     0x04            /* timestamp (struct bintime) */
   #define SCM_REALTIME    0x05            /* timestamp (struct timespec) */
   #define SCM_MONOTONIC   0x06            /* timestamp (struct timespec) */
   #define SCM_TIME_INFO   0x07            /* timestamp info */
   #define SCM_CREDS2      0x08            /* process creds (struct sockcred2) */
   
   struct sock_timestamp_info {
           __uint32_t      st_info_flags;
           __uint32_t      st_info_pad0;
           __uint64_t      st_info_rsv[7];
   };
   
   #define ST_INFO_HW              0x0001          /* SCM_TIMESTAMP was hw */
   #define ST_INFO_HW_HPREC        0x0002          /* SCM_TIMESTAMP was hw-assisted
                                                      on entrance */
   #endif
   
   #if __BSD_VISIBLE
   /*
    * 4.3 compat sockaddr, move to compat file later
    */
   struct osockaddr {
           unsigned short sa_family;       /* address family */
           char    sa_data[14];            /* up to 14 bytes of direct address */
   };
   
   /*
    * 4.3-compat message header (move to compat file later).
    */
   struct omsghdr {
           char    *msg_name;              /* optional address */
           int     msg_namelen;            /* size of address */
           struct  iovec *msg_iov;         /* scatter/gather array */
           int     msg_iovlen;             /* # elements in msg_iov */
           char    *msg_accrights;         /* access rights sent/received */
           int     msg_accrightslen;
   };
   #endif
   
   /*
    * howto arguments for shutdown(2), specified by Posix.1g.
    */
   #define SHUT_RD         0               /* shut down the reading side */
   #define SHUT_WR         1               /* shut down the writing side */
   #define SHUT_RDWR       2               /* shut down both sides */
   
   #if __BSD_VISIBLE
   /* for SCTP */
   /* we cheat and use the SHUT_XX defines for these */
   #define PRU_FLUSH_RD     SHUT_RD
   #define PRU_FLUSH_WR     SHUT_WR
   #define PRU_FLUSH_RDWR   SHUT_RDWR
   #endif
   
   #if __BSD_VISIBLE
   /*
    * sendfile(2) header/trailer struct
    */
   struct sf_hdtr {
           struct iovec *headers;  /* pointer to an array of header struct iovec's */
           int hdr_cnt;            /* number of header iovec's */
           struct iovec *trailers; /* pointer to an array of trailer struct iovec's */
           int trl_cnt;            /* number of trailer iovec's */
   };
   
   /*
    * Sendfile-specific flag(s)
    */
   #define SF_NODISKIO     0x00000001
   #define SF_MNOWAIT      0x00000002      /* obsolete */
   #define SF_SYNC         0x00000004
   #define SF_USER_READAHEAD       0x00000008
   #define SF_NOCACHE      0x00000010
   #define SF_FLAGS(rh, flags)     (((rh) << 16) | (flags))
   
   #ifdef _KERNEL
   #define SF_READAHEAD(flags)     ((flags) >> 16)
   #endif /* _KERNEL */
   
   /*
    * Sendmmsg/recvmmsg specific structure(s)
    */
   struct mmsghdr {
           struct msghdr   msg_hdr;                /* message header */
           ssize_t         msg_len;                /* message length */
   };
   #endif /* __BSD_VISIBLE */
   
   #ifndef _KERNEL
   
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   int     accept(int, struct sockaddr * __restrict, socklen_t * __restrict);
   int     bind(int, const struct sockaddr *, socklen_t);
   int     connect(int, const struct sockaddr *, socklen_t);
   #if __BSD_VISIBLE
   int     accept4(int, struct sockaddr * __restrict, socklen_t * __restrict, int);
   int     bindat(int, int, const struct sockaddr *, socklen_t);
   int     connectat(int, int, const struct sockaddr *, socklen_t);
   #endif
   int     getpeername(int, struct sockaddr * __restrict, socklen_t * __restrict);
   int     getsockname(int, struct sockaddr * __restrict, socklen_t * __restrict);
   int     getsockopt(int, int, int, void * __restrict, socklen_t * __restrict);
   int     listen(int, int);
   ssize_t recv(int, void *, size_t, int);
   ssize_t recvfrom(int, void *, size_t, int, struct sockaddr * __restrict, socklen_t * __restrict);
   ssize_t recvmsg(int, struct msghdr *, int);
   #if __BSD_VISIBLE
   struct timespec;
   ssize_t recvmmsg(int, struct mmsghdr * __restrict, size_t, int,
       const struct timespec * __restrict);
   #endif
   ssize_t send(int, const void *, size_t, int);
   ssize_t sendto(int, const void *,
               size_t, int, const struct sockaddr *, socklen_t);
   ssize_t sendmsg(int, const struct msghdr *, int);
   #if __BSD_VISIBLE
   int     sendfile(int, int, off_t, size_t, struct sf_hdtr *, off_t *, int);
   ssize_t sendmmsg(int, struct mmsghdr * __restrict, size_t, int);
   int     setfib(int);
   #endif
   int     setsockopt(int, int, int, const void *, socklen_t);
   int     shutdown(int, int);
   int     sockatmark(int);
   int     socket(int, int, int);
   int     socketpair(int, int, int, int *);
   __END_DECLS
   
   #endif /* !_KERNEL */
   
   #ifdef _KERNEL
   struct socket;
   
   struct inpcb *so_sotoinpcb(struct socket *so);
   struct sockbuf *so_sockbuf_snd(struct socket *);
   struct sockbuf *so_sockbuf_rcv(struct socket *);
   
   int so_state_get(const struct socket *);
   void so_state_set(struct socket *, int);
   
   int so_options_get(const struct socket *);
   void so_options_set(struct socket *, int);
   
   int so_error_get(const struct socket *);
   void so_error_set(struct socket *, int);
   
   int so_linger_get(const struct socket *);
   void so_linger_set(struct socket *, int);
   
   struct protosw *so_protosw_get(const struct socket *);
   void so_protosw_set(struct socket *, struct protosw *);
   
   void so_sorwakeup_locked(struct socket *so);
   void so_sowwakeup_locked(struct socket *so);
   
   void so_sorwakeup(struct socket *so);
   void so_sowwakeup(struct socket *so);
   
   void so_lock(struct socket *so);
   void so_unlock(struct socket *so);
   
   #endif /* _KERNEL */
   #endif /* !_SYS_SOCKET_H_ */

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