routed.tproj/af.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1983, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgment:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  *
  56  *      @(#)defs.h      8.1 (Berkeley) 6/5/93
  57  */
  58
  59
  60 #include "defs.h"
  61
  62 /*
  63  * Address family support routines
  64  */
  65 int     inet_hash(), inet_netmatch(), inet_output(),
  66         inet_portmatch(), inet_portcheck(),
  67         inet_checkhost(), inet_rtflags(), inet_sendroute(), inet_canon();
  68 char    *inet_format();
  69
  70 #define NIL     { 0 }
  71 #define INET \
  72         { inet_hash,            inet_netmatch,          inet_output, \
  73           inet_portmatch,       inet_portcheck,         inet_checkhost, \
  74           inet_rtflags,         inet_sendroute,         inet_canon, \
  75           inet_format \
  76         }
  77
  78 struct afswitch afswitch[AF_MAX] = {
  79         NIL,            /* 0- unused */
  80         NIL,            /* 1- Unix domain, unused */
  81         INET,           /* Internet */
  82 };
  83
  84 int af_max = sizeof(afswitch) / sizeof(afswitch[0]);
  85
  86 struct sockaddr_in inet_default = {
  87 #ifdef RTM_ADD
  88         sizeof (inet_default),
  89 #endif
  90         AF_INET, INADDR_ANY };
  91
  92 inet_hash(sin, hp)
  93         register struct sockaddr_in *sin;
  94         struct afhash *hp;
  95 {
  96         register u_long n;
  97
  98         n = inet_netof(sin->sin_addr);
  99         if (n)
 100             while ((n & 0xff) == 0)
 101                 n >>= 8;
 102         hp->afh_nethash = n;
 103         hp->afh_hosthash = ntohl(sin->sin_addr.s_addr);
 104         hp->afh_hosthash &= 0x7fffffff;
 105 }
 106
 107 inet_netmatch(sin1, sin2)
 108         struct sockaddr_in *sin1, *sin2;
 109 {
 110
 111         return (inet_netof(sin1->sin_addr) == inet_netof(sin2->sin_addr));
 112 }
 113
 114 /*
 115  * Verify the message is from the right port.
 116  */
 117 inet_portmatch(sin)
 118         register struct sockaddr_in *sin;
 119 {
 120
 121         return (sin->sin_port == sp->s_port);
 122 }
 123
 124 /*
 125  * Verify the message is from a "trusted" port.
 126  */
 127 inet_portcheck(sin)
 128         struct sockaddr_in *sin;
 129 {
 130
 131         return (ntohs(sin->sin_port) <= IPPORT_RESERVED);
 132 }
 133
 134 /*
 135  * Internet output routine.
 136  */
 137 inet_output(s, flags, sin, size)
 138         int s, flags;
 139         struct sockaddr_in *sin;
 140         int size;
 141 {
 142         struct sockaddr_in dst;
 143
 144         dst = *sin;
 145         sin = &dst;
 146         if (sin->sin_port == 0)
 147                 sin->sin_port = sp->s_port;
 148         if (sin->sin_len == 0)
 149                 sin->sin_len = sizeof (*sin);
 150         if (sendto(s, packet, size, flags,
 151             (struct sockaddr *)sin, sizeof (*sin)) < 0)
 152                 perror("sendto");
 153 }
 154
 155 /*
 156  * Return 1 if the address is believed
 157  * for an Internet host -- THIS IS A KLUDGE.
 158  */
 159 inet_checkhost(sin)
 160         struct sockaddr_in *sin;
 161 {
 162         u_long i = ntohl(sin->sin_addr.s_addr);
 163
 164 #ifndef IN_EXPERIMENTAL
 165 #define IN_EXPERIMENTAL(i)      (((long) (i) & 0xe0000000) == 0xe0000000)
 166 #endif
 167
 168         if (IN_EXPERIMENTAL(i) || sin->sin_port != 0)
 169                 return (0);
 170         if (i != 0 && (i & 0xff000000) == 0)
 171                 return (0);
 172         for (i = 0; i < sizeof(sin->sin_zero)/sizeof(sin->sin_zero[0]); i++)
 173                 if (sin->sin_zero[i])
 174                         return (0);
 175         return (1);
 176 }
 177
 178 inet_canon(sin)
 179         struct sockaddr_in *sin;
 180 {
 181
 182         sin->sin_port = 0;
 183         sin->sin_len = sizeof(*sin);
 184 }
 185
 186 char *
 187 inet_format(sin)
 188         struct sockaddr_in *sin;
 189 {
 190         char *inet_ntoa();
 191
 192         return (inet_ntoa(sin->sin_addr));
 193 }