The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 1982, 1986, 1989, 1993
    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  *      @(#)unpcb.h     8.1 (Berkeley) 6/2/93
   34  * $FreeBSD: releng/5.0/sys/sys/unpcb.h 96755 2002-05-16 21:28:32Z trhodes $
   35  */
   36 
   37 #ifndef _SYS_UNPCB_H_
   38 #define _SYS_UNPCB_H_
   39 
   40 #include <sys/queue.h>
   41 #include <sys/ucred.h>
   42 
   43 /*
   44  * Protocol control block for an active
   45  * instance of a UNIX internal protocol.
   46  *
   47  * A socket may be associated with an vnode in the
   48  * filesystem.  If so, the unp_vnode pointer holds
   49  * a reference count to this vnode, which should be irele'd
   50  * when the socket goes away.
   51  *
   52  * A socket may be connected to another socket, in which
   53  * case the control block of the socket to which it is connected
   54  * is given by unp_conn.
   55  *
   56  * A socket may be referenced by a number of sockets (e.g. several
   57  * sockets may be connected to a datagram socket.)  These sockets
   58  * are in a linked list starting with unp_refs, linked through
   59  * unp_nextref and null-terminated.  Note that a socket may be referenced
   60  * by a number of other sockets and may also reference a socket (not
   61  * necessarily one which is referencing it).  This generates
   62  * the need for unp_refs and unp_nextref to be separate fields.
   63  *
   64  * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
   65  * so that changes in the sockbuf may be computed to modify
   66  * back pressure on the sender accordingly.
   67  */
   68 typedef u_quad_t        unp_gen_t;
   69 LIST_HEAD(unp_head, unpcb);
   70 
   71 struct unpcb {
   72         LIST_ENTRY(unpcb) unp_link;     /* glue on list of all PCBs */
   73         struct  socket *unp_socket;     /* pointer back to socket */
   74         struct  vnode *unp_vnode;       /* if associated with file */
   75         struct  vnode *unp_rvnode;      /* root vp for creating process */
   76         ino_t   unp_ino;                /* fake inode number */
   77         struct  unpcb *unp_conn;        /* control block of connected socket */
   78         struct  unp_head unp_refs;      /* referencing socket linked list */
   79         LIST_ENTRY(unpcb) unp_reflink;  /* link in unp_refs list */
   80         struct  sockaddr_un *unp_addr;  /* bound address of socket */
   81         int     unp_cc;                 /* copy of rcv.sb_cc */
   82         int     unp_mbcnt;              /* copy of rcv.sb_mbcnt */
   83         unp_gen_t unp_gencnt;           /* generation count of this instance */
   84         int     unp_flags;              /* flags */
   85         struct  xucred unp_peercred;    /* peer credentials, if applicable */
   86 };
   87 
   88 /*
   89  * Flags in unp_flags.
   90  *
   91  * UNP_HAVEPC - indicates that the unp_peercred member is filled in
   92  * and is really the credentials of the connected peer.  This is used
   93  * to determine whether the contents should be sent to the user or
   94  * not.
   95  *
   96  * UNP_HAVEPCCACHED - indicates that the unp_peercred member is filled
   97  * in, but does *not* contain the credentials of the connected peer
   98  * (there may not even be a peer).  This is set in unp_listen() when
   99  * it fills in unp_peercred for later consumption by unp_connect().
  100  */
  101 #define UNP_HAVEPC                      0x001
  102 #define UNP_HAVEPCCACHED                0x002
  103 
  104 #define sotounpcb(so)   ((struct unpcb *)((so)->so_pcb))
  105 
  106 /* Hack alert -- this structure depends on <sys/socketvar.h>. */
  107 #ifdef  _SYS_SOCKETVAR_H_
  108 struct xunpcb {
  109         size_t  xu_len;                 /* length of this structure */
  110         struct  unpcb *xu_unpp;         /* to help netstat, fstat */
  111         struct  unpcb xu_unp;           /* our information */
  112         union {
  113                 struct  sockaddr_un xuu_addr;   /* our bound address */
  114                 char    xu_dummy1[256];
  115         } xu_au;
  116 #define xu_addr xu_au.xuu_addr
  117         union {
  118                 struct  sockaddr_un xuu_caddr; /* their bound address */
  119                 char    xu_dummy2[256];
  120         } xu_cau;
  121 #define xu_caddr xu_cau.xuu_caddr
  122         struct  xsocket xu_socket;
  123         u_quad_t        xu_alignment_hack;
  124 };
  125 
  126 struct xunpgen {
  127         size_t  xug_len;
  128         u_int   xug_count;
  129         unp_gen_t xug_gen;
  130         so_gen_t xug_sogen;
  131 };
  132 #endif /* _SYS_SOCKETVAR_H_ */
  133 
  134 #endif /* _SYS_UNPCB_H_ */

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