sys/net/raw_cb.c

   1 /*      $NetBSD: raw_cb.c,v 1.19 2008/04/24 11:38:37 ad Exp $   */
   2
   3 /*
   4  * Copyright (c) 1980, 1986, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)raw_cb.c    8.1 (Berkeley) 6/10/93
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __KERNEL_RCSID(0, "$NetBSD: raw_cb.c,v 1.19 2008/04/24 11:38:37 ad Exp $");
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/socket.h>
  41 #include <sys/socketvar.h>
  42 #include <sys/domain.h>
  43 #include <sys/protosw.h>
  44 #include <sys/errno.h>
  45
  46 #include <net/if.h>
  47 #include <net/route.h>
  48 #include <net/raw_cb.h>
  49 #include <netinet/in.h>
  50
  51 /*
  52  * Routines to manage the raw protocol control blocks.
  53  *
  54  * TODO:
  55  *      hash lookups by protocol family/protocol + address family
  56  *      take care of unique address problems per AF?
  57  *      redo address binding to allow wildcards
  58  */
  59
  60 struct  rawcbhead rawcb = LIST_HEAD_INITIALIZER(rawcb);
  61
  62 u_long  raw_sendspace = RAWSNDQ;
  63 u_long  raw_recvspace = RAWRCVQ;
  64
  65 /*
  66  * Allocate a control block and a nominal amount
  67  * of buffer space for the socket.
  68  */
  69 int
  70 raw_attach(struct socket *so, int proto)
  71 {
  72         struct rawcb *rp = sotorawcb(so);
  73         int error;
  74
  75         /*
  76          * It is assumed that raw_attach is called
  77          * after space has been allocated for the
  78          * rawcb.
  79          */
  80         if (rp == 0)
  81                 return (ENOBUFS);
  82         if ((error = soreserve(so, raw_sendspace, raw_recvspace)) != 0)
  83                 return (error);
  84         rp->rcb_socket = so;
  85         rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
  86         rp->rcb_proto.sp_protocol = proto;
  87         LIST_INSERT_HEAD(&rawcb, rp, rcb_list);
  88         return (0);
  89 }
  90
  91 /*
  92  * Detach the raw connection block and discard
  93  * socket resources.
  94  */
  95 void
  96 raw_detach(struct rawcb *rp)
  97 {
  98         struct socket *so = rp->rcb_socket;
  99
 100         so->so_pcb = NULL;
 101         KASSERT(so->so_lock == softnet_lock);   /* XXX */
 102         LIST_REMOVE(rp, rcb_list);              /* remove last reference */
 103         /* sofree drops the socket's lock. */
 104         sofree(so);
 105 #ifdef notdef
 106         if (rp->rcb_laddr)
 107                 m_freem(dtom(rp->rcb_laddr));
 108         rp->rcb_laddr = 0;
 109 #endif
 110         free((void *)rp, M_PCB);
 111         mutex_enter(softnet_lock);
 112 }
 113
 114 /*
 115  * Disconnect and possibly release resources.
 116  */
 117 void
 118 raw_disconnect(struct rawcb *rp)
 119 {
 120
 121 #ifdef notdef
 122         if (rp->rcb_faddr)
 123                 m_freem(dtom(rp->rcb_faddr));
 124         rp->rcb_faddr = 0;
 125 #endif
 126         if (rp->rcb_socket->so_state & SS_NOFDREF)
 127                 raw_detach(rp);
 128 }