along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: route.c,v 1.1.2.9 2001/05/28 08:21:43 guus Exp $
+ $Id: route.c,v 1.1.2.14 2001/06/21 16:16:32 guus Exp $
*/
#include "config.h"
#ifdef HAVE_FREEBSD
#include <sys/param.h>
+#endif
+#include <sys/socket.h>
+#include <netinet/in.h>
+#ifdef HAVE_SOLARIS
+ #include <netinet/if.h>
+ #define ETHER_ADDR_LEN 6
#else
- #include <netinet/in.h>
+ #include <net/ethernet.h>
#endif
+#include <netinet/if_ether.h>
#include <utils.h>
#include <xalloc.h>
#include <syslog.h>
+#include <avl_tree.h>
+
#include "net.h"
#include "connection.h"
#include "subnet.h"
#include "route.h"
+#include "protocol.h"
#include "system.h"
int routing_mode = RMODE_ROUTER;
subnet_t mymac;
-void learn_mac(connection_t *source, mac_t *address)
+void learn_mac(mac_t *address)
{
subnet_t *subnet;
+ avl_node_t *node;
+ connection_t *p;
cp
subnet = lookup_subnet_mac(address);
+
+ /* If we don't know this MAC address yet, store it */
- if(!subnet)
+ if(!subnet || subnet->owner!=myself)
{
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_INFO, _("Learned new MAC address %hhx:%hhx:%hhx:%hhx:%hhx:%hhx"),
+ address->x[0], address->x[1], address->x[2], address->x[3], address->x[4], address->x[5]);
+
subnet = new_subnet();
subnet->type = SUBNET_MAC;
-// subnet->lasttime = gettimeofday();
memcpy(&subnet->net.mac.address, address, sizeof(mac_t));
- subnet_add(source, subnet);
+ subnet_add(myself, subnet);
- if(debug_lvl >= DEBUG_TRAFFIC)
+ /* And tell all other tinc daemons it's our MAC */
+
+ for(node = connection_tree->head; node; node = node->next)
{
- syslog(LOG_DEBUG, _("Learned new MAC address %x:%x:%x:%x:%x:%x from %s (%s)"),
- address->x[0],
- address->x[1],
- address->x[2],
- address->x[3],
- address->x[4],
- address->x[5],
- source->name, source->hostname);
+ p = (connection_t *)node->data;
+ if(p->status.meta && p->status.active && p!= myself)
+ send_add_subnet(p, subnet);
}
}
}
-connection_t *route_mac(connection_t *source, vpn_packet_t *packet)
+connection_t *route_mac(vpn_packet_t *packet)
{
subnet_t *subnet;
cp
/* Learn source address */
- learn_mac(source, (mac_t *)(&packet->data[0]));
+ learn_mac((mac_t *)(&packet->data[6]));
/* Lookup destination address */
- subnet = lookup_subnet_mac((mac_t *)(&packet->data[6]));
+ subnet = lookup_subnet_mac((mac_t *)(&packet->data[0]));
- if(!subnet)
- {
- 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]);
- }
- return NULL;
- }
-cp
- return subnet->owner;
+ if(subnet)
+ return subnet->owner;
+ else
+ return NULL;
}
connection_t *route_ipv4(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_node_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)
{
break;
case RMODE_SWITCH:
- cl = route_mac(myself, packet);
+ cl = route_mac(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);
+ memcpy(packet->data, mymac.net.mac.address.x, 6); /* Override destination address to make the kernel accept it */
+ accept_packet(packet);
break;
case RMODE_SWITCH:
- learn_mac(source, (mac_t *)(&packet->data[0]));
+ {
+ subnet_t *subnet;
+
+ subnet = lookup_subnet_mac((mac_t *)(&packet->data[0]));
+
+ if(subnet)
+ {
+ if(subnet->owner == myself)
+ accept_packet(packet);
+ else
+ send_packet(subnet->owner, packet);
+ }
+ else
+ {
+ broadcast_packet(source, packet);
+ accept_packet(packet);
+ }
+ }
+ break;
+ case RMODE_HUB:
+ broadcast_packet(source,packet); /* Spread it on */
+ accept_packet(packet);
break;
}
-
- accept_packet(packet);
}
projects / tinc / blobdiff