www.tinc-vpn.org Git - tinc/blob - src/route.c

   1 /*
   2     route.c -- routing
   3     Copyright (C) 2000,2001 Ivo Timmermans <itimmermans@bigfoot.com>,
   4                   2000,2001 Guus Sliepen <guus@sliepen.warande.net>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20     $Id: route.c,v 1.1.2.9 2001/05/28 08:21:43 guus Exp $
  21 */
  22
  23 #include "config.h"
  24
  25 #ifdef HAVE_FREEBSD
  26  #include <sys/param.h>
  27 #else
  28  #include <netinet/in.h>
  29 #endif
  30 #include <utils.h>
  31 #include <xalloc.h>
  32 #include <syslog.h>
  33
  34 #include "net.h"
  35 #include "connection.h"
  36 #include "subnet.h"
  37 #include "route.h"
  38
  39 #include "system.h"
  40
  41 int routing_mode = RMODE_ROUTER;
  42 subnet_t mymac;
  43
  44 void learn_mac(connection_t *source, mac_t *address)
  45 {
  46   subnet_t *subnet;
  47 cp
  48   subnet = lookup_subnet_mac(address);
  49
  50   if(!subnet)
  51     {
  52       subnet = new_subnet();
  53       subnet->type = SUBNET_MAC;
  54 //      subnet->lasttime = gettimeofday();
  55       memcpy(&subnet->net.mac.address, address, sizeof(mac_t));
  56       subnet_add(source, subnet);
  57
  58       if(debug_lvl >= DEBUG_TRAFFIC)
  59         {
  60           syslog(LOG_DEBUG, _("Learned new MAC address %x:%x:%x:%x:%x:%x from %s (%s)"),
  61                address->x[0],
  62                address->x[1],
  63                address->x[2],
  64                address->x[3],
  65                address->x[4],
  66                address->x[5],
  67                source->name, source->hostname);
  68         }
  69     }
  70 }
  71
  72 connection_t *route_mac(connection_t *source, vpn_packet_t *packet)
  73 {
  74   subnet_t *subnet;
  75 cp
  76   /* Learn source address */
  77
  78   learn_mac(source, (mac_t *)(&packet->data[0]));
  79
  80   /* Lookup destination address */
  81
  82   subnet = lookup_subnet_mac((mac_t *)(&packet->data[6]));
  83
  84   if(!subnet)
  85     {
  86       if(debug_lvl >= DEBUG_TRAFFIC)
  87         {
  88           syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %x:%x:%x:%x:%x:%x"),
  89                  packet->data[6],
  90                  packet->data[7],
  91                  packet->data[8],
  92                  packet->data[9],
  93                  packet->data[10],
  94                  packet->data[11]);
  95         }
  96       return NULL;
  97     }
  98 cp
  99   return subnet->owner;
 100 }
 101
 102 connection_t *route_ipv4(vpn_packet_t *packet)
 103 {
 104   ipv4_t dest;
 105   subnet_t *subnet;
 106 cp
 107   dest = ntohl(*((unsigned long*)(&packet->data[30])));
 108
 109   subnet = lookup_subnet_ipv4(&dest);
 110
 111   if(!subnet)
 112     {
 113       if(debug_lvl >= DEBUG_TRAFFIC)
 114         {
 115           syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %d.%d.%d.%d"),
 116                  packet->data[30], packet->data[31], packet->data[32], packet->data[33]);
 117         }
 118
 119       return NULL;
 120     }
 121 cp
 122   return subnet->owner;
 123 }
 124
 125 connection_t *route_ipv6(vpn_packet_t *packet)
 126 {
 127 cp
 128   if(debug_lvl > DEBUG_NOTHING)
 129     {
 130       syslog(LOG_WARNING, _("Cannot route packet: IPv6 routing not yet implemented"));
 131     }
 132 cp
 133   return NULL;
 134 }
 135
 136 void route_outgoing(vpn_packet_t *packet)
 137 {
 138   unsigned short int type;
 139   avl_node_t *node;
 140   connection_t *cl;
 141 cp
 142   /* FIXME: multicast? */
 143
 144   switch(routing_mode)
 145     {
 146       case RMODE_ROUTER:
 147         type = ntohs(*((unsigned short*)(&packet->data[12])));
 148         switch(type)
 149           {
 150             case 0x0800:
 151               cl = route_ipv4(packet);
 152               break;
 153             case 0x86DD:
 154               cl = route_ipv6(packet);
 155               break;
 156             default:
 157               if(debug_lvl >= DEBUG_TRAFFIC)
 158                 {
 159                   syslog(LOG_WARNING, _("Cannot route packet: unknown type %hx"), type);
 160                 }
 161               return;
 162            }
 163          if(cl)
 164            send_packet(cl, packet);
 165          break;
 166
 167       case RMODE_SWITCH:
 168         cl = route_mac(myself, packet);
 169         if(cl)
 170           send_packet(cl, packet);
 171         break;
 172
 173       case RMODE_HUB:
 174         for(node = connection_tree->head; node; node = node->next)
 175           {
 176             cl = (connection_t *)node->data;
 177             if(cl->status.active)
 178               send_packet(cl, packet);
 179           }
 180         break;
 181     }
 182 }
 183
 184 void route_incoming(connection_t *source, vpn_packet_t *packet)
 185 {
 186   switch(routing_mode)
 187     {
 188       case RMODE_ROUTER:
 189         memcpy(packet->data, mymac.net.mac.address.x, 6);
 190         break;
 191       case RMODE_SWITCH:
 192         learn_mac(source, (mac_t *)(&packet->data[0]));
 193         break;
 194     }
 195
 196   accept_packet(packet);
 197 }