routed.tproj/if.c

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