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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)unpcb.h     8.1 (Berkeley) 6/2/93
   30  * $FreeBSD: releng/10.0/sys/sys/unpcb.h 174988 2007-12-30 01:42:15Z jeff $
   31  */
   32 
   33 #ifndef _SYS_UNPCB_H_
   34 #define _SYS_UNPCB_H_
   35 
   36 #include <sys/queue.h>
   37 #include <sys/ucred.h>
   38 
   39 /*
   40  * Protocol control block for an active
   41  * instance of a UNIX internal protocol.
   42  *
   43  * A socket may be associated with a vnode in the
   44  * filesystem.  If so, the unp_vnode pointer holds
   45  * a reference count to this vnode, which should be irele'd
   46  * when the socket goes away.
   47  *
   48  * A socket may be connected to another socket, in which
   49  * case the control block of the socket to which it is connected
   50  * is given by unp_conn.
   51  *
   52  * A socket may be referenced by a number of sockets (e.g. several
   53  * sockets may be connected to a datagram socket.)  These sockets
   54  * are in a linked list starting with unp_refs, linked through
   55  * unp_nextref and null-terminated.  Note that a socket may be referenced
   56  * by a number of other sockets and may also reference a socket (not
   57  * necessarily one which is referencing it).  This generates
   58  * the need for unp_refs and unp_nextref to be separate fields.
   59  *
   60  * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
   61  * so that changes in the sockbuf may be computed to modify
   62  * back pressure on the sender accordingly.
   63  */
   64 typedef u_quad_t        unp_gen_t;
   65 LIST_HEAD(unp_head, unpcb);
   66 
   67 struct unpcb {
   68         LIST_ENTRY(unpcb) unp_link;     /* glue on list of all PCBs */
   69         struct  socket *unp_socket;     /* pointer back to socket */
   70         struct  file *unp_file;         /* back-pointer to file for gc. */
   71         struct  vnode *unp_vnode;       /* if associated with file */
   72         ino_t   unp_ino;                /* fake inode number */
   73         struct  unpcb *unp_conn;        /* control block of connected socket */
   74         struct  unp_head unp_refs;      /* referencing socket linked list */
   75         LIST_ENTRY(unpcb) unp_reflink;  /* link in unp_refs list */
   76         struct  sockaddr_un *unp_addr;  /* bound address of socket */
   77         int     unp_cc;                 /* copy of rcv.sb_cc */
   78         int     unp_mbcnt;              /* copy of rcv.sb_mbcnt */
   79         unp_gen_t unp_gencnt;           /* generation count of this instance */
   80         short   unp_flags;              /* flags */
   81         short   unp_gcflag;             /* Garbage collector flags. */
   82         struct  xucred unp_peercred;    /* peer credentials, if applicable */
   83         u_int   unp_refcount;
   84         u_int   unp_msgcount;           /* references from message queue */
   85         struct  mtx unp_mtx;            /* mutex */
   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 #define UNP_WANTCRED                    0x004   /* credentials wanted */
  104 #define UNP_CONNWAIT                    0x008   /* connect blocks until accepted */
  105 
  106 #define UNPGC_REF                       0x1     /* unpcb has external ref. */
  107 #define UNPGC_DEAD                      0x2     /* unpcb might be dead. */
  108 #define UNPGC_SCANNED                   0x4     /* Has been scanned. */
  109 
  110 /*
  111  * These flags are used to handle non-atomicity in connect() and bind()
  112  * operations on a socket: in particular, to avoid races between multiple
  113  * threads or processes operating simultaneously on the same socket.
  114  */
  115 #define UNP_CONNECTING                  0x010   /* Currently connecting. */
  116 #define UNP_BINDING                     0x020   /* Currently binding. */
  117 
  118 #define sotounpcb(so)   ((struct unpcb *)((so)->so_pcb))
  119 
  120 /* Hack alert -- this structure depends on <sys/socketvar.h>. */
  121 #ifdef  _SYS_SOCKETVAR_H_
  122 struct xunpcb {
  123         size_t  xu_len;                 /* length of this structure */
  124         struct  unpcb *xu_unpp;         /* to help netstat, fstat */
  125         struct  unpcb xu_unp;           /* our information */
  126         union {
  127                 struct  sockaddr_un xuu_addr;   /* our bound address */
  128                 char    xu_dummy1[256];
  129         } xu_au;
  130 #define xu_addr xu_au.xuu_addr
  131         union {
  132                 struct  sockaddr_un xuu_caddr; /* their bound address */
  133                 char    xu_dummy2[256];
  134         } xu_cau;
  135 #define xu_caddr xu_cau.xuu_caddr
  136         struct  xsocket xu_socket;
  137         u_quad_t        xu_alignment_hack;
  138 };
  139 
  140 struct xunpgen {
  141         size_t  xug_len;
  142         u_int   xug_count;
  143         unp_gen_t xug_gen;
  144         so_gen_t xug_sogen;
  145 };
  146 #endif /* _SYS_SOCKETVAR_H_ */
  147 
  148 #endif /* _SYS_UNPCB_H_ */

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