sys/sys/unpcb.h

   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: src/sys/sys/unpcb.h,v 1.9.2.1 2002/03/09 05:22:23 dd Exp $
  35  * $DragonFly: src/sys/sys/unpcb.h,v 1.5 2008/05/27 05:25:36 dillon Exp $
  36  */
  37
  38 #ifndef _SYS_UNPCB_H_
  39 #define _SYS_UNPCB_H_
  40
  41 #include <sys/queue.h>
  42 #include <sys/ucred.h>
  43
  44 /*
  45  * Protocol control block for an active
  46  * instance of a UNIX internal protocol.
  47  *
  48  * A socket may be associated with an vnode in the
  49  * file system.  If so, the unp_vnode pointer holds
  50  * a reference count to this vnode, which should be irele'd
  51  * when the socket goes away.
  52  *
  53  * A socket may be connected to another socket, in which
  54  * case the control block of the socket to which it is connected
  55  * is given by unp_conn.
  56  *
  57  * A socket may be referenced by a number of sockets (e.g. several
  58  * sockets may be connected to a datagram socket.)  These sockets
  59  * are in a linked list starting with unp_refs, linked through
  60  * unp_nextref and null-terminated.  Note that a socket may be referenced
  61  * by a number of other sockets and may also reference a socket (not
  62  * necessarily one which is referencing it).  This generates
  63  * the need for unp_refs and unp_nextref to be separate fields.
  64  *
  65  * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
  66  * so that changes in the sockbuf may be computed to modify
  67  * back pressure on the sender accordingly.
  68  */
  69 typedef u_quad_t        unp_gen_t;
  70 LIST_HEAD(unp_head, unpcb);
  71
  72 struct  unpcb {
  73         LIST_ENTRY(unpcb) unp_link;     /* glue on list of all PCBs */
  74         struct  socket *unp_socket;     /* pointer back to socket */
  75         struct  vnode *unp_vnode;       /* if associated with file */
  76         struct  vnode *unp_rvnode;      /* root vp for creating process */
  77         ino_t   unp_ino;                /* fake inode number */
  78         struct  unpcb *unp_conn;        /* control block of connected socket */
  79         struct  unp_head unp_refs;      /* referencing socket linked list */
  80         LIST_ENTRY(unpcb) unp_reflink;  /* link in unp_refs list */
  81         struct  sockaddr_un *unp_addr;  /* bound address of socket */
  82         int     unused01;
  83         int     unused02;
  84         unp_gen_t unp_gencnt;           /* generation count of this instance */
  85         int     unp_flags;              /* flags */
  86         struct  xucred unp_peercred;    /* peer credentials, if applicable */
  87 };
  88
  89 /*
  90  * Flags in unp_flags.
  91  *
  92  * UNP_HAVEPC - indicates that the unp_peercred member is filled in
  93  * and is really the credentials of the connected peer.  This is used
  94  * to determine whether the contents should be sent to the user or
  95  * not.
  96  *
  97  * UNP_HAVEPCCACHED - indicates that the unp_peercred member is filled
  98  * in, but does *not* contain the credentials of the connected peer
  99  * (there may not even be a peer).  This is set in unp_listen() when
 100  * it fills in unp_peercred for later consumption by unp_connect().
 101  */
 102 #define UNP_HAVEPC                      0x001
 103 #define UNP_HAVEPCCACHED                0x002
 104
 105 /* Hack alert -- this structure depends on <sys/socketvar.h>. */
 106 #ifdef  _SYS_SOCKETVAR_H_
 107 struct  xunpcb {
 108         size_t  xu_len;                 /* length of this structure */
 109         struct  unpcb *xu_unpp;         /* to help netstat, fstat */
 110         struct  unpcb xu_unp;           /* our information */
 111         union {
 112                 struct  sockaddr_un xuu_addr;   /* our bound address */
 113                 char    xu_dummy1[256];
 114         } xu_au;
 115 #define xu_addr xu_au.xuu_addr
 116         union {
 117                 struct  sockaddr_un xuu_caddr; /* their bound address */
 118                 char    xu_dummy2[256];
 119         } xu_cau;
 120 #define xu_caddr xu_cau.xuu_caddr
 121         struct  xsocket xu_socket;
 122         u_quad_t        xu_alignment_hack;
 123 };
 124 #endif /* _SYS_SOCKETVAR_H_ */
 125
 126 #endif /* _SYS_UNPCB_H_ */