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

     /*
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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: src/sys/sys/socket.h,v 1.39.2.7 2001/07/03 11:02:01 ume Exp $
     */
    
    #ifndef _SYS_SOCKET_H_
    #define _SYS_SOCKET_H_
    
    #include <sys/_iovec.h>
    
    #ifndef _SYS_TYPES_H_
    #include <sys/types.h>
    #endif
    #include <machine/stdint.h>
    
    #define _NO_NAMESPACE_POLLUTION
    #include <machine/param.h>
    #undef _NO_NAMESPACE_POLLUTION
    
    /*
     * Definitions related to sockets: types, address families, options.
     */
    
    /*
     * Data types.
     */
    typedef __uint8_t       sa_family_t;
    
    #ifndef _SOCKLEN_T_DECLARED
    #define _SOCKLEN_T_DECLARED
    typedef __socklen_t     socklen_t;
    #endif
    
     
    /*
     * Types
     */
    #define SOCK_STREAM     1               /* stream socket */
    #define SOCK_DGRAM      2               /* datagram socket */
    #define SOCK_RAW        3               /* raw-protocol interface */
    #define SOCK_RDM        4               /* reliably-delivered message */
    #define SOCK_SEQPACKET  5               /* sequenced packet stream */
    
    /*
     * Option flags per-socket.
     */
    #define SO_DEBUG        0x0001          /* turn on debugging info recording */
    #define SO_ACCEPTCONN   0x0002          /* socket has had listen() */
    #define SO_REUSEADDR    0x0004          /* allow local address reuse */
    #define SO_KEEPALIVE    0x0008          /* keep connections alive */
    #define SO_DONTROUTE    0x0010          /* just use interface addresses */
    #define SO_BROADCAST    0x0020          /* permit sending of broadcast msgs */
    #define SO_USELOOPBACK  0x0040          /* bypass hardware when possible */
    #define SO_LINGER       0x0080          /* linger on close if data present */
    #define SO_OOBINLINE    0x0100          /* leave received OOB data in line */
    #define SO_REUSEPORT    0x0200          /* allow local address & port reuse */
    #define SO_TIMESTAMP    0x0400          /* timestamp received dgram traffic */
    #define SO_NOSIGPIPE    0x0800          /* no SIGPIPE from EPIPE */
    #define SO_ACCEPTFILTER 0x1000          /* there is an accept filter */
    
    /*
     * 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 */
   /*efine SO_PRIVSTATE    0x1009             get/deny privileged state */
   #define SO_SNDSPACE     0x100a          /* get appr. send buffer free space */
   
   /*
    * Structure used for manipulating linger option.
    */
   struct  linger {
           int     l_onoff;                /* option on/off */
           int     l_linger;               /* linger time */
   };
   
   struct  accept_filter_arg {
           char    af_name[16];
           char    af_arg[256-16];
   };
   
   /*
    * 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 */
   #define AF_LOCAL        1               /* local to host (pipes, portals) */
   #define AF_UNIX         AF_LOCAL        /* backward compatibility */
   #define AF_INET         2               /* internetwork: UDP, TCP, etc. */
   #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_NS           6               /* XEROX NS 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 */
   #define AF_INET6        28              /* IPv6 */
   #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_BLUETOOTH    33              /* Bluetooth */
   #define AF_MPLS         34              /* Multi-Protocol Label Switching */
   #define AF_IEEE80211    35              /* IEEE 802.11 protocol */
   
   #define AF_MAX          36
   
   /*
    * Structure used by kernel to store most
    * addresses.
    */
   struct sockaddr {
           __uint8_t       sa_len;         /* total length */
           sa_family_t     sa_family;      /* address family */
           char            sa_data[14];    /* actually longer; address value */
   };
   #define SOCK_MAXADDRLEN 255             /* longest possible addresses */
   
   #ifdef _KERNEL
   
   #ifndef _SYS_LIBKERN_H_
   #include <sys/libkern.h>                /* for bcmp() */
   #endif
   
   static __inline boolean_t
   sa_equal(const struct sockaddr *a1, const struct sockaddr *a2)
   {
           return (bcmp(a1, a2, a1->sa_len) == 0);
   }
   #endif
   
   /*
    * Structure used by kernel to pass protocol
    * information in raw sockets.
    */
   struct sockproto {
           __uint16_t      sp_family;              /* address family */
           __uint16_t      sp_protocol;            /* protocol */
   };
   
   /*
    * RFC 2553: protocol-independent placeholder for socket addresses
    */
   #define _SS_MAXSIZE     128
   #define _SS_ALIGNSIZE   (sizeof(int64_t))
   #define _SS_PAD1SIZE    (_SS_ALIGNSIZE - sizeof(unsigned char) - sizeof(sa_family_t))
   #define _SS_PAD2SIZE    (_SS_MAXSIZE - sizeof(unsigned char) - sizeof(sa_family_t) - \
                                   _SS_PAD1SIZE - _SS_ALIGNSIZE)
   
   struct sockaddr_storage {
           __uint8_t       ss_len;         /* address length */
           sa_family_t     ss_family;      /* address family */
           char            __ss_pad1[_SS_PAD1SIZE];
           __int64_t       __ss_align;     /* force desired structure storage alignment */
           char            __ss_pad2[_SS_PAD2SIZE];
   };
   
   /*
    * 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_NS           AF_NS
   #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          /* same format as AF_NS */
   #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_BLUETOOTH    AF_BLUETOOTH
   
   #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 below.
    */
   #define NET_MAXID       AF_MAX
   
   #define CTL_NET_NAMES { \
           { 0, 0 }, \
           { "unix", CTLTYPE_NODE }, \
           { "inet", CTLTYPE_NODE }, \
           { "implink", CTLTYPE_NODE }, \
           { "pup", CTLTYPE_NODE }, \
           { "chaos", CTLTYPE_NODE }, \
           { "xerox_ns", CTLTYPE_NODE }, \
           { "iso", CTLTYPE_NODE }, \
           { "emca", CTLTYPE_NODE }, \
           { "datakit", CTLTYPE_NODE }, \
           { "ccitt", CTLTYPE_NODE }, \
           { "ibm_sna", CTLTYPE_NODE }, \
           { "decnet", CTLTYPE_NODE }, \
           { "dec_dli", CTLTYPE_NODE }, \
           { "lat", CTLTYPE_NODE }, \
           { "hylink", CTLTYPE_NODE }, \
           { "appletalk", CTLTYPE_NODE }, \
           { "route", CTLTYPE_NODE }, \
           { "link_layer", CTLTYPE_NODE }, \
           { "xtp", CTLTYPE_NODE }, \
           { "coip", CTLTYPE_NODE }, \
           { "cnt", CTLTYPE_NODE }, \
           { "rtip", CTLTYPE_NODE }, \
           { "ipx", CTLTYPE_NODE }, \
           { "sip", CTLTYPE_NODE }, \
           { "pip", CTLTYPE_NODE }, \
           { "isdn", CTLTYPE_NODE }, \
           { "key", CTLTYPE_NODE }, \
           { "inet6", CTLTYPE_NODE }, \
           { "natm", CTLTYPE_NODE }, \
           { "atm", CTLTYPE_NODE }, \
           { "hdrcomplete", CTLTYPE_NODE }, \
           { "netgraph", CTLTYPE_NODE }, \
           { "bluetooth", CTLTYPE_NODE}, \
   }
   
   /*
    * 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_MAXID    4
   
   #define CTL_NET_RT_NAMES { \
           { 0, 0 }, \
           { "dump", CTLTYPE_STRUCT }, \
           { "flags", CTLTYPE_STRUCT }, \
           { "iflist", CTLTYPE_STRUCT }, \
   }
   
   /*
    * Maximum queue length specifiable by listen.
    */
   #define SOMAXCONN       128
   
   /*
    * Maximum setsockopt buffer size
    */
   #define SOMAXOPT_SIZE   65536
   
   /*
    * 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 */
   #define MSG_DONTWAIT    0x00000080      /* this message should be nonblocking */
   #define MSG_EOF         0x00000100      /* data completes connection */
   #define MSG_NOTIFICATION 0x00000200     /* notification message */
   #define MSG_NOSIGNAL    0x00000400      /* No SIGPIPE to unconnected socket stream */
   #define MSG_SYNC        0x00000800      /* No asynchronized pru_send */
   
   /*
    * These override FIONBIO.  MSG_FNONBLOCKING is functionally equivalent to
    * MSG_DONTWAIT.
    */
   #define MSG_FBLOCKING   0x00010000      /* force blocking operation */
   #define MSG_FNONBLOCKING 0x00020000     /* force non-blocking operation */
   
   #define MSG_FMASK       0xFFFF0000      /* force mask */
   
   /*
    * 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[]; */
   };
   
   /*
    * While we may have more groups than this, the cmsgcred struct must
    * be able to fit in an mbuf, and NGROUPS_MAX is too large to allow
    * this.
   */
   #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 */
   };
   
   /* Alignment requirement for CMSG struct manipulation */
   #define _CMSG_ALIGN(n)          (((n) + 3) & ~3)
   
   #ifdef _KERNEL
   #define CMSG_ALIGN(n)           _CMSG_ALIGN(n)
   #endif
   
   /* given pointer to struct cmsghdr, return pointer to data */
   #define CMSG_DATA(cmsg)         ((unsigned char *)(cmsg) + \
                                    _CMSG_ALIGN(sizeof(struct cmsghdr)))
   
   /* given pointer to struct cmsghdr, return pointer to next cmsghdr */
   #define CMSG_NXTHDR(mhdr, cmsg) \
           (((caddr_t)(cmsg) + _CMSG_ALIGN((cmsg)->cmsg_len) + \
             _CMSG_ALIGN(sizeof(struct cmsghdr)) > \
               (caddr_t)(mhdr)->msg_control + (mhdr)->msg_controllen) ? \
               NULL : \
               (struct cmsghdr *)((caddr_t)(cmsg) + _CMSG_ALIGN((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 : \
            NULL)
   
   /* RFC 2292 additions */
           
   #define CMSG_SPACE(l)           (_CMSG_ALIGN(sizeof(struct cmsghdr)) + _CMSG_ALIGN(l))
   #define CMSG_LEN(l)             (_CMSG_ALIGN(sizeof(struct cmsghdr)) + (l))
   
   /* "Socket"-level control message types: */
   #define SCM_RIGHTS      0x01            /* access rights (array of int) */
   #define SCM_TIMESTAMP   0x02            /* timestamp (struct timeval) */
   #define SCM_CREDS       0x03            /* process creds (struct cmsgcred) */
   
   /*
    * 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 */
   
   /*
    * 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 */
   };
   
   #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
   
   #ifndef _SYS_CDEFS_H_
   #include <sys/cdefs.h>
   #endif
   
   __BEGIN_DECLS
   int     accept (int, struct sockaddr *, socklen_t *);
   int     extaccept (int, int, struct sockaddr *, socklen_t *);
   int     bind (int, const struct sockaddr *, socklen_t);
   int     connect (int, const struct sockaddr *, socklen_t);
   int     extconnect (int, int, struct sockaddr *, socklen_t);
   int     getpeername (int, struct sockaddr *, socklen_t *);
   int     getsockname (int, struct sockaddr *, socklen_t *);
   int     getsockopt (int, int, int, void *, socklen_t *);
   int     listen (int, int);
   ssize_t recv (int, void *, size_t, int);
   ssize_t recvfrom (int, void *, size_t, int, struct sockaddr *, socklen_t *);
   ssize_t recvmsg (int, struct msghdr *, int);
   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);
   int     sendfile (int, int, off_t, size_t, struct sf_hdtr *, off_t *, int);
   int     setsockopt (int, int, int, const void *, socklen_t);
   int     shutdown (int, int);
   int     sockatmark(int);
   int     socketpair (int, int, int, int *);
   
   void    pfctlinput (int, struct sockaddr *);
   __END_DECLS
   
   #endif /* !_KERNEL */
   
   #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
   #ifndef _SYS_CDEFS_H_
   #include <sys/cdefs.h>
   #endif
   
   __BEGIN_DECLS
   int     socket (int, int, int);
   __END_DECLS
   #endif  /* !_KERNEL || _KERNEL_VIRTUAL */
   
   #endif /* !_SYS_SOCKET_H_ */

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