tinc/src/route.c

/*
    route.c -- routing
    Copyright (C) 2000 Ivo Timmermans <itimmermans@bigfoot.com>,
                  2000 Guus Sliepen <guus@sliepen.warande.net>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: route.c,v 1.1.2.2 2000/11/04 22:57:33 guus Exp $
*/

#include "config.h"

#include <utils.h>
#include <xalloc.h>

#include "net.h"
#include "connlist.h"

#include "system.h"

int routing_mode = 0;		/* Will be used to determine if we route by MAC or by payload's protocol */

conn_list_t *route_packet(vpn_packet_t *packet)
{
  unsigned short type;
cp
  type = ntohs(*((unsigned short*)(&packet.data[12])))

  if(routing_mode)
    {
      return route_mac(packet);
    }

  switch(type)
    {
      case 0x0800:
        return route_ipv4(packet);
      case 0x86DD:
        return route_ipv6(packet);
/*
      case 0x8137:
        return route_ipx(packet);
      case 0x0806:
        return route_arp(packet);
*/
      default:
        if(debug_lvl >= DEBUG_TRAFFIC)
          {
            syslog(LOG_WARNING, _("Cannot route packet: unknown type %hx"), type);
          }
        return NULL;
     }
}

conn_list_t *route_mac(vpn_packet_t *packet)
{
  conn_list_t *cl;
cp
  cl = lookup_subnet_mac((mac_t *)(&packet.data[6]));
  if(!cl)
    if(debug_lvl >= DEBUG_TRAFFIC)
      {
        syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %x:%x:%x:%x:%x:%x"),
               packet.data[6],
               packet.data[7],
               packet.data[8],
               packet.data[9],
               packet.data[10],
               packet.data[11]);
      } 
cp  
  return cl;  
}


conn_list_t *route_ipv4(vpn_packet_t *packet)
{
  ipv4_t dest;
  conn_list_t *cl;
cp
  dest = ntohl(*((unsigned long*)(&packet.data[30]);
  
  cl = lookup_subnet_ipv4(dest);
  if(!cl)
    if(debug_lvl >= DEBUG_TRAFFIC)
      {
        syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %d.%d.%d.%d"),
               packet.data[30], packet.data[31], packet.data[32], packet.data[33]);
      } 
cp
  return cl;  
}

conn_list_t *route_ipv6(vpn_packet_t *packet)
{
cp
  syslog(LOG_WARNING, _("Cannot route packet: IPv6 routing not implemented yet"));
cp
  return NULL;
}