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

     /*
      * Copyright (c) 1982, 1986, 1989, 1993
      *      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.
     *
     *      @(#)unpcb.h     8.1 (Berkeley) 6/2/93
     * $FreeBSD: releng/5.1/sys/sys/unpcb.h 110430 2003-02-06 01:34:43Z hsu $
     */
    
    #ifndef _SYS_UNPCB_H_
    #define _SYS_UNPCB_H_
    
    #include <sys/queue.h>
    #include <sys/ucred.h>
    
    /*
     * Protocol control block for an active
     * instance of a UNIX internal protocol.
     *
     * A socket may be associated with a vnode in the
     * filesystem.  If so, the unp_vnode pointer holds
     * a reference count to this vnode, which should be irele'd
     * when the socket goes away.
     *
     * A socket may be connected to another socket, in which
     * case the control block of the socket to which it is connected
     * is given by unp_conn.
     *
     * A socket may be referenced by a number of sockets (e.g. several
     * sockets may be connected to a datagram socket.)  These sockets
     * are in a linked list starting with unp_refs, linked through
     * unp_nextref and null-terminated.  Note that a socket may be referenced
     * by a number of other sockets and may also reference a socket (not
     * necessarily one which is referencing it).  This generates
     * the need for unp_refs and unp_nextref to be separate fields.
     *
     * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
     * so that changes in the sockbuf may be computed to modify
     * back pressure on the sender accordingly.
     */
    typedef u_quad_t        unp_gen_t;
    LIST_HEAD(unp_head, unpcb);
    
    struct unpcb {
            LIST_ENTRY(unpcb) unp_link;     /* glue on list of all PCBs */
            struct  socket *unp_socket;     /* pointer back to socket */
            struct  vnode *unp_vnode;       /* if associated with file */
            ino_t   unp_ino;                /* fake inode number */
            struct  unpcb *unp_conn;        /* control block of connected socket */
            struct  unp_head unp_refs;      /* referencing socket linked list */
            LIST_ENTRY(unpcb) unp_reflink;  /* link in unp_refs list */
            struct  sockaddr_un *unp_addr;  /* bound address of socket */
            int     unp_cc;                 /* copy of rcv.sb_cc */
            int     unp_mbcnt;              /* copy of rcv.sb_mbcnt */
            unp_gen_t unp_gencnt;           /* generation count of this instance */
            int     unp_flags;              /* flags */
            struct  xucred unp_peercred;    /* peer credentials, if applicable */
    };
    
    /*
     * Flags in unp_flags.
     *
     * UNP_HAVEPC - indicates that the unp_peercred member is filled in
     * and is really the credentials of the connected peer.  This is used
     * to determine whether the contents should be sent to the user or
     * not.
     *
     * UNP_HAVEPCCACHED - indicates that the unp_peercred member is filled
     * in, but does *not* contain the credentials of the connected peer
     * (there may not even be a peer).  This is set in unp_listen() when
     * it fills in unp_peercred for later consumption by unp_connect().
     */
   #define UNP_HAVEPC                      0x001
   #define UNP_HAVEPCCACHED                0x002
   
   #define sotounpcb(so)   ((struct unpcb *)((so)->so_pcb))
   
   /* Hack alert -- this structure depends on <sys/socketvar.h>. */
   #ifdef  _SYS_SOCKETVAR_H_
   struct xunpcb {
           size_t  xu_len;                 /* length of this structure */
           struct  unpcb *xu_unpp;         /* to help netstat, fstat */
           struct  unpcb xu_unp;           /* our information */
           union {
                   struct  sockaddr_un xuu_addr;   /* our bound address */
                   char    xu_dummy1[256];
           } xu_au;
   #define xu_addr xu_au.xuu_addr
           union {
                   struct  sockaddr_un xuu_caddr; /* their bound address */
                   char    xu_dummy2[256];
           } xu_cau;
   #define xu_caddr xu_cau.xuu_caddr
           struct  xsocket xu_socket;
           u_quad_t        xu_alignment_hack;
   };
   
   struct xunpgen {
           size_t  xug_len;
           u_int   xug_count;
           unp_gen_t xug_gen;
           so_gen_t xug_sogen;
   };
   #endif /* _SYS_SOCKETVAR_H_ */
   
   #endif /* _SYS_UNPCB_H_ */

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