tinc/src/route.c

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/*
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.
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$Id: route.c,v 1.1.2.3 2000/11/20 19:12:17 guus Exp $
*/
#include "config.h"
#include <utils.h>
#include <xalloc.h>
#include "net.h"
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#include "connection.h"
#include "system.h"
int routing_mode = 0; /* Will be used to determine if we route by MAC or by payload's protocol */
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connection_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;
}
}
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connection_t *route_mac(vpn_packet_t *packet)
{
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connection_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;
}
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connection_t *route_ipv4(vpn_packet_t *packet)
{
ipv4_t dest;
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connection_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;
}
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connection_t *route_ipv6(vpn_packet_t *packet)
{
cp
syslog(LOG_WARNING, _("Cannot route packet: IPv6 routing not implemented yet"));
cp
return NULL;
}