src/route.c

   1 /*
   2     route.c -- routing
   3     Copyright (C) 2000 Ivo Timmermans <itimmermans@bigfoot.com>,
   4                   2000 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 1.1.2.5 2001/01/07 15:25:49 guus Exp $
  21 */
  22
  23 #include "config.h"
  24
  25 #include <utils.h>
  26 #include <xalloc.h>
  27 #include <syslog.h>
  28
  29 #include "net.h"
  30 #include "connection.h"
  31 #include "subnet.h"
  32 #include "route.h"
  33
  34 #include "system.h"
  35
  36 int routing_mode = RMODE_ROUTER;
  37
  38 void learn_mac(connection_t *source, mac_t *address)
  39 {
  40   connection_t *old;
  41   subnet_t *subnet;
  42 cp
  43   old = lookup_subnet_mac(address)->owner;
  44
  45   if(!old)
  46     {
  47       subnet = new_subnet();
  48       subnet->type = SUBNET_MAC;
  49 //      subnet->lasttime = gettimeofday();
  50       memcpy(&subnet->net.mac.address, address, sizeof(mac_t));
  51       subnet_add(source, subnet);
  52
  53       if(DEBUG_LVL >= DEBUG_TRAFFIC)
  54         {
  55           syslog(LOG_DEBUG, _("Learned new MAC address %x:%x:%x:%x:%x:%x from %s (%s)"),
  56                address->address.x[0],
  57                address->address.x[1],
  58                address->address.x[2],
  59                address->address.x[3],
  60                address->address.x[4],
  61                address->address.x[5],
  62                cl->name, cl->hostname);
  63         }
  64     }
  65 }
  66
  67 connection_t *route_mac(connection_t *source, vpn_packet_t *packet)
  68 {
  69   connection_t *oldsrc, *dst;
  70   subnet_t *subnet;
  71 cp
  72   /* Learn source address */
  73
  74   learn_mac(source, (mac_t *)(&packet->data[0]));
  75
  76   /* Lookup destination address */
  77
  78   dst = lookup_subnet_mac((mac_t *)(&packet->data[6]))->owner;
  79
  80   if(!dst)
  81     if(debug_lvl >= DEBUG_TRAFFIC)
  82       {
  83         syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %x:%x:%x:%x:%x:%x"),
  84                packet->data[6],
  85                packet->data[7],
  86                packet->data[8],
  87                packet->data[9],
  88                packet->data[10],
  89                packet->data[11]);
  90       }
  91 cp
  92   return dst;
  93 }
  94
  95 connection_t *route_ipv4(vpn_packet_t *packet)
  96 {
  97   ipv4_t dest;
  98   connection_t *cl;
  99 cp
 100   dest = ntohl(*((unsigned long*)(&packet->data[30])));
 101
 102   cl = lookup_subnet_ipv4(&dest)->owner;
 103   if(!cl)
 104     if(debug_lvl >= DEBUG_TRAFFIC)
 105       {
 106         syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %d.%d.%d.%d"),
 107                packet->data[30], packet->data[31], packet->data[32], packet->data[33]);
 108       }
 109 cp
 110   return cl;
 111 }
 112
 113 connection_t *route_ipv6(vpn_packet_t *packet)
 114 {
 115 cp
 116   if(debug_lvl > DEBUG_NOTHING)
 117     {
 118       syslog(LOG_WARNING, _("Cannot route packet: IPv6 routing not yet implemented"));
 119     }
 120 cp
 121   return NULL;
 122 }
 123
 124 void route_outgoing(vpn_packet_t *packet)
 125 {
 126   unsigned short int type;
 127   avl_tree_t *node;
 128   connection_t *cl;
 129 cp
 130   /* FIXME: multicast? */
 131
 132   switch(routing_mode)
 133     {
 134       case RMODE_ROUTER:
 135         type = ntohs(*((unsigned short*)(&packet->data[12])));
 136         switch(type)
 137           {
 138             case 0x0800:
 139               cl = route_ipv4(packet);
 140               break;
 141             case 0x86DD:
 142               cl = route_ipv6(packet);
 143               break;
 144             default:
 145               if(debug_lvl >= DEBUG_TRAFFIC)
 146                 {
 147                   syslog(LOG_WARNING, _("Cannot route packet: unknown type %hx"), type);
 148                 }
 149               return;
 150            }
 151          send_packet(cl, packet);
 152          break;
 153
 154       case RMODE_SWITCH:
 155         cl = route_mac(packet);
 156         if(cl)
 157           send_packet(cl, packet);
 158         break;
 159
 160       case RMODE_HUB:
 161         for(node = connection_tree->head; node; node = node->next)
 162           {
 163             cl = (connection_t *)node->data;
 164             if(cl->status.active)
 165               send_packet(cl, packet);
 166           }
 167         break;
 168     }
 169 }
 170
 171 void route_incoming(connection_t *source, vpn_packet_t *packet)
 172 {
 173   switch(routing_mode)
 174     {
 175       case RMODE_SWITCH:
 176         learn_mac(source, &packet->data[0]);
 177         break;
 178     }
 179
 180   accept_packet(packet);
 181 }