/*
route.c -- routing
- Copyright (C) 2000 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000 Guus Sliepen <guus@sliepen.warande.net>
+ Copyright (C) 2000,2001 Ivo Timmermans <itimmermans@bigfoot.com>,
+ 2000,2001 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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: route.c,v 1.1.2.5 2001/01/07 15:25:49 guus Exp $
+ $Id: route.c,v 1.1.2.12 2001/06/05 16:31:59 guus Exp $
*/
#include "config.h"
+#ifdef HAVE_FREEBSD
+ #include <sys/param.h>
+#endif
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <net/ethernet.h>
+#include <netinet/if_ether.h>
#include <utils.h>
#include <xalloc.h>
#include <syslog.h>
#include "net.h"
+#include "net/ethernet.h"
+#include "netinet/if_ether.h"
#include "connection.h"
#include "subnet.h"
#include "route.h"
#include "system.h"
int routing_mode = RMODE_ROUTER;
+subnet_t mymac;
void learn_mac(connection_t *source, mac_t *address)
{
- connection_t *old;
subnet_t *subnet;
cp
- old = lookup_subnet_mac(address)->owner;
+ subnet = lookup_subnet_mac(address);
- if(!old)
+ if(!subnet)
{
subnet = new_subnet();
subnet->type = SUBNET_MAC;
memcpy(&subnet->net.mac.address, address, sizeof(mac_t));
subnet_add(source, subnet);
- if(DEBUG_LVL >= DEBUG_TRAFFIC)
+ if(debug_lvl >= DEBUG_TRAFFIC)
{
syslog(LOG_DEBUG, _("Learned new MAC address %x:%x:%x:%x:%x:%x from %s (%s)"),
- address->address.x[0],
- address->address.x[1],
- address->address.x[2],
- address->address.x[3],
- address->address.x[4],
- address->address.x[5],
- cl->name, cl->hostname);
+ address->x[0],
+ address->x[1],
+ address->x[2],
+ address->x[3],
+ address->x[4],
+ address->x[5],
+ source->name, source->hostname);
}
}
}
connection_t *route_mac(connection_t *source, vpn_packet_t *packet)
{
- connection_t *oldsrc, *dst;
subnet_t *subnet;
cp
/* Learn source address */
- learn_mac(source, (mac_t *)(&packet->data[0]));
+ learn_mac(source, (mac_t *)(&packet->data[6]));
/* Lookup destination address */
- dst = lookup_subnet_mac((mac_t *)(&packet->data[6]))->owner;
-
- if(!dst)
- 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 dst;
+ subnet = lookup_subnet_mac((mac_t *)(&packet->data[0]));
+
+ if(subnet)
+ return subnet->owner;
+ else
+ return NULL;
}
connection_t *route_ipv4(vpn_packet_t *packet)
{
ipv4_t dest;
- connection_t *cl;
+ subnet_t *subnet;
cp
dest = ntohl(*((unsigned long*)(&packet->data[30])));
- cl = lookup_subnet_ipv4(&dest)->owner;
- 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]);
- }
+ subnet = lookup_subnet_ipv4(&dest);
+
+ if(!subnet)
+ {
+ 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]);
+ }
+
+ return NULL;
+ }
cp
- return cl;
+ return subnet->owner;
}
connection_t *route_ipv6(vpn_packet_t *packet)
return NULL;
}
+void route_arp(vpn_packet_t *packet)
+{
+ struct ether_arp *arp;
+ subnet_t *subnet;
+ unsigned char ipbuf[4];
+ ipv4_t dest;
+cp
+ /* First, snatch the source address from the ARP packet */
+
+ memcpy(mymac.net.mac.address.x, packet->data + 6, 6);
+
+ /* This routine generates replies to ARP requests.
+ You don't need to set NOARP flag on the interface anymore (which is broken on FreeBSD).
+ Most of the code here is taken from choparp.c by Takamichi Tateoka (tree@mma.club.uec.ac.jp)
+ */
+
+ arp = (struct ether_arp *)(packet->data + 14);
+
+ /* Check if this is a valid ARP request */
+
+ if(ntohs(arp->arp_hrd) != ARPHRD_ETHER ||
+ ntohs(arp->arp_pro) != ETHERTYPE_IP ||
+ (int) (arp->arp_hln) != ETHER_ADDR_LEN ||
+ (int) (arp->arp_pln) != 4 ||
+ ntohs(arp->arp_op) != ARPOP_REQUEST )
+ {
+ if(debug_lvl > DEBUG_TRAFFIC)
+ {
+ syslog(LOG_WARNING, _("Cannot route packet: received unknown type ARP request"));
+ }
+ return;
+ }
+
+ /* Check if the IP address exists on the VPN */
+
+ dest = ntohl(*((unsigned long*)(arp->arp_tpa)));
+ subnet = lookup_subnet_ipv4(&dest);
+
+ if(!subnet)
+ {
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ {
+ syslog(LOG_WARNING, _("Cannot route packet: ARP request for unknown address %d.%d.%d.%d"),
+ arp->arp_tpa[0], arp->arp_tpa[1], arp->arp_tpa[2], arp->arp_tpa[3]);
+ }
+
+ return;
+ }
+
+ /* Check if it is for our own subnet */
+
+ if(subnet->owner == myself)
+ return; /* silently ignore */
+
+ memcpy(packet->data, packet->data + ETHER_ADDR_LEN, ETHER_ADDR_LEN); /* copy destination address */
+ packet->data[ETHER_ADDR_LEN*2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */
+
+ memcpy(ipbuf, arp->arp_tpa, 4); /* save protocol addr */
+ memcpy(arp->arp_tpa, arp->arp_spa, 4); /* swap destination and source protocol address */
+ memcpy(arp->arp_spa, ipbuf, 4); /* ... */
+
+ memcpy(arp->arp_tha, arp->arp_sha, 10); /* set target hard/proto addr */
+ memcpy(arp->arp_sha, packet->data + ETHER_ADDR_LEN, ETHER_ADDR_LEN); /* add fake source hard addr */
+ arp->arp_op = htons(ARPOP_REPLY);
+
+ accept_packet(packet);
+cp
+}
+
void route_outgoing(vpn_packet_t *packet)
{
unsigned short int type;
- avl_tree_t *node;
connection_t *cl;
cp
/* FIXME: multicast? */
case 0x86DD:
cl = route_ipv6(packet);
break;
+ case 0x0806:
+ route_arp(packet);
+ return;
default:
if(debug_lvl >= DEBUG_TRAFFIC)
{
}
return;
}
- send_packet(cl, packet);
+ if(cl)
+ send_packet(cl, packet);
break;
case RMODE_SWITCH:
- cl = route_mac(packet);
+ cl = route_mac(myself, packet);
if(cl)
send_packet(cl, packet);
+ else
+ broadcast_packet(myself, packet);
break;
case RMODE_HUB:
- for(node = connection_tree->head; node; node = node->next)
- {
- cl = (connection_t *)node->data;
- if(cl->status.active)
- send_packet(cl, packet);
- }
+ broadcast_packet(myself, packet);
break;
}
}
{
switch(routing_mode)
{
+ case RMODE_ROUTER:
+ memcpy(packet->data, mymac.net.mac.address.x, 6); /* Override destination address to make the kernel accept it */
+ break;
case RMODE_SWITCH:
- learn_mac(source, &packet->data[0]);
+ if((packet->data[0] & packet->data[1]) == 0xFF) /* Broadcast? */
+ broadcast_packet(source, packet); /* If yes, spread it on */
+ else
+ learn_mac(source, (mac_t *)(&packet->data[6]));
+ break;
+ case RMODE_HUB:
+ broadcast_packet(source,packet); /* Spread it on */
break;
}
projects / tinc / blobdiff