Handle broadcast and multicast packets in router mode.

[tinc] / src / route.c

diff --git a/src/route.c b/src/route.c
index 7e0dfc6..742fbc2 100644 (file)
--- a/src/route.c
+++ b/src/route.c
@@ -163,17 +163,23 @@ void age_subnets(void)
 static void route_mac(node_t *source, vpn_packet_t *packet)
 {
        subnet_t *subnet;
+       mac_t dest;
 
        cp();
 
+
        /* Learn source address */
 
-       if(source == myself)
-               learn_mac((mac_t *)(&packet->data[6]));
+       if(source == myself) {
+               mac_t src;
+               memcpy(&src, &packet->data[6], sizeof src);
+               learn_mac(&src);
+       }
 
        /* Lookup destination address */
 
-       subnet = lookup_subnet_mac((mac_t *)(&packet->data[0]));
+       memcpy(&dest, &packet->data[0], sizeof dest);
+       subnet = lookup_subnet_mac(&dest);
 
        if(!subnet) {
                broadcast_packet(source, packet);
@@ -316,18 +322,20 @@ static void route_ipv4_unicast(node_t *source, vpn_packet_t *packet)
 {
        subnet_t *subnet;
        node_t *via;
+       ipv4_t dest;
 
        cp();
 
-       subnet = lookup_subnet_ipv4((ipv4_t *) &packet->data[30]);
+       memcpy(&dest, &packet->data[30], sizeof dest);
+       subnet = lookup_subnet_ipv4(&dest);
 
        if(!subnet) {
                ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet from %s (%s): unknown IPv4 destination address %d.%d.%d.%d"),
                                source->name, source->hostname,
-                               packet->data[30],
-                               packet->data[31],
-                               packet->data[32],
-                               packet->data[33]);
+                               dest.x[0],
+                               dest.x[1],
+                               dest.x[2],
+                               dest.x[3]);
 
                route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_UNKNOWN);
                return;
@@ -368,7 +376,14 @@ static void route_ipv4(node_t *source, vpn_packet_t *packet)
        if(!checklength(source, packet, ether_size + ip_size))
                return;
 
-       route_ipv4_unicast(source, packet);
+       if(packet->data[30] & 0xf0 == 0xe0 ||
+                       packet->data[30] == 255 &&
+                       packet->data[31] == 255 &&
+                       packet->data[32] == 255 &&
+                       packet->data[33] == 255)
+               broadcast_packet(source, packet);
+       else
+               route_ipv4_unicast(source, packet);
 }
 
 /* RFC 2463 */
@@ -454,22 +469,24 @@ static void route_ipv6_unicast(node_t *source, vpn_packet_t *packet)
 {
        subnet_t *subnet;
        node_t *via;
+       ipv6_t dest;
 
        cp();
 
-       subnet = lookup_subnet_ipv6((ipv6_t *) &packet->data[38]);
+       memcpy(&dest, &packet->data[38], sizeof dest);
+       subnet = lookup_subnet_ipv6(&dest);
 
        if(!subnet) {
                ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet from %s (%s): unknown IPv6 destination address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"),
                                source->name, source->hostname,
-                               ntohs(*(uint16_t *) &packet->data[38]),
-                               ntohs(*(uint16_t *) &packet->data[40]),
-                               ntohs(*(uint16_t *) &packet->data[42]),
-                               ntohs(*(uint16_t *) &packet->data[44]),
-                               ntohs(*(uint16_t *) &packet->data[46]),
-                               ntohs(*(uint16_t *) &packet->data[48]),
-                               ntohs(*(uint16_t *) &packet->data[50]),
-                               ntohs(*(uint16_t *) &packet->data[52]));
+                               ntohs(dest.x[0]),
+                               ntohs(dest.x[1]),
+                               ntohs(dest.x[2]),
+                               ntohs(dest.x[3]),
+                               ntohs(dest.x[4]),
+                               ntohs(dest.x[5]),
+                               ntohs(dest.x[6]),
+                               ntohs(dest.x[7]));
 
                route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADDR);
                return;
@@ -635,7 +652,10 @@ static void route_ipv6(node_t *source, vpn_packet_t *packet)
                return;
        }
 
-       route_ipv6_unicast(source, packet);
+       if(packet->data[38] == 255)
+               broadcast_packet(source, packet);
+       else
+               route_ipv6_unicast(source, packet);
 }
 
 /* RFC 826 */