routed.tproj/if.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1983, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgment:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  *      @(#)defs.h      8.1 (Berkeley) 6/5/93
  58  */
  59
  60
  61 /*
  62  * Routing Table Management Daemon
  63  */
  64 #include "defs.h"
  65
  66 extern  struct interface *ifnet;
  67
  68 /*
  69  * Find the interface with address addr.
  70  */
  71 struct interface *
  72 if_ifwithaddr(addr)
  73         struct sockaddr *addr;
  74 {
  75         register struct interface *ifp;
  76
  77 #define same(a1, a2) \
  78         (memcmp((a1)->sa_data, (a2)->sa_data, 14) == 0)
  79         for (ifp = ifnet; ifp; ifp = ifp->int_next) {
  80                 if (ifp->int_flags & IFF_REMOTE)
  81                         continue;
  82                 if (ifp->int_addr.sa_family != addr->sa_family)
  83                         continue;
  84                 if (same(&ifp->int_addr, addr))
  85                         break;
  86                 if ((ifp->int_flags & IFF_BROADCAST) &&
  87                     same(&ifp->int_broadaddr, addr))
  88                         break;
  89         }
  90         return (ifp);
  91 }
  92
  93 /*
  94  * Find the point-to-point interface with destination address addr.
  95  */
  96 struct interface *
  97 if_ifwithdstaddr(addr)
  98         struct sockaddr *addr;
  99 {
 100         register struct interface *ifp;
 101
 102         for (ifp = ifnet; ifp; ifp = ifp->int_next) {
 103                 if ((ifp->int_flags & IFF_POINTOPOINT) == 0)
 104                         continue;
 105                 if (same(&ifp->int_dstaddr, addr))
 106                         break;
 107         }
 108         return (ifp);
 109 }
 110
 111 /*
 112  * Find the interface on the network
 113  * of the specified address.
 114  */
 115 struct interface *
 116 if_ifwithnet(addr)
 117         register struct sockaddr *addr;
 118 {
 119         register struct interface *ifp;
 120         register int af = addr->sa_family;
 121         register int (*netmatch)();
 122
 123         if (af >= af_max)
 124                 return (0);
 125         netmatch = afswitch[af].af_netmatch;
 126         for (ifp = ifnet; ifp; ifp = ifp->int_next) {
 127                 if (ifp->int_flags & IFF_REMOTE)
 128                         continue;
 129                 if (af != ifp->int_addr.sa_family)
 130                         continue;
 131                 if ((*netmatch)(addr, &ifp->int_addr))
 132                         break;
 133         }
 134         return (ifp);
 135 }
 136
 137 /*
 138  * Find an interface from which the specified address
 139  * should have come from.  Used for figuring out which
 140  * interface a packet came in on -- for tracing.
 141  */
 142 struct interface *
 143 if_iflookup(addr)
 144         struct sockaddr *addr;
 145 {
 146         register struct interface *ifp, *maybe;
 147         register int af = addr->sa_family;
 148         register int (*netmatch)();
 149
 150         if (af >= af_max)
 151                 return (0);
 152         maybe = 0;
 153         netmatch = afswitch[af].af_netmatch;
 154         for (ifp = ifnet; ifp; ifp = ifp->int_next) {
 155                 if (ifp->int_addr.sa_family != af)
 156                         continue;
 157                 if (same(&ifp->int_addr, addr))
 158                         break;
 159                 if ((ifp->int_flags & IFF_BROADCAST) &&
 160                     same(&ifp->int_broadaddr, addr))
 161                         break;
 162                 if ((ifp->int_flags & IFF_POINTOPOINT) &&
 163                     same(&ifp->int_dstaddr, addr))
 164                         break;
 165                 if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr))
 166                         maybe = ifp;
 167         }
 168         if (ifp == 0)
 169                 ifp = maybe;
 170         return (ifp);
 171 }