Do not fragment packets smaller than RFC defined minimum MTUs.

For IPv6, the minimum MTU is 1280 (RFC 2460), for IPv4 the minimum is actually
68, but this is such a low limit that it will probably hurt performance, so we
do as if it is 576 (the minimum packet size hosts should be able to handle, RFC
791). If we detect a path MTU smaller than those minima, and we have to handle
a packet that is bigger than the PMTU but smaller than those minima, we forward
them via TCP instead of fragmenting or returning ICMP packets.

diff --git a/src/route.c b/src/route.c
index 1642389..5117e92 100644 (file)
--- a/src/route.c
+++ b/src/route.c
@@ -48,6 +48,7 @@ static const size_t ip6_size = sizeof(struct ip6_hdr);
 static const size_t icmp6_size = sizeof(struct icmp6_hdr);
 static const size_t ns_size = sizeof(struct nd_neighbor_solicit);
 static const size_t opt_size = sizeof(struct nd_opt_hdr);
+#define max(a, b) ((a) > (b) ? (a) : (b))
 
 /* RFC 1071 */
 
@@ -315,10 +316,10 @@ static void route_ipv4_unicast(node_t *source, vpn_packet_t *packet) {
 
        via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via;
        
-       if(via && packet->len > via->mtu && via != myself) {
+       if(via && packet->len > max(via->mtu, 590) && via != myself) {
                ifdebug(TRAFFIC) logger(LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu);
                if(packet->data[20] & 0x40) {
-                       packet->len = via->mtu;
+                       packet->len = max(via->mtu, 590);
                        route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED);
                } else {
                        fragment_ipv4_packet(via, packet);
@@ -458,9 +459,9 @@ static void route_ipv6_unicast(node_t *source, vpn_packet_t *packet) {
 
        via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via;
        
-       if(via && packet->len > via->mtu && via != myself) {
+       if(via && packet->len > max(via->mtu, 1294) && via != myself) {
                ifdebug(TRAFFIC) logger(LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu);
-               packet->len = via->mtu;
+               packet->len = max(via->mtu, 1294);
                route_ipv6_unreachable(source, packet, ICMP6_PACKET_TOO_BIG, 0);
                return;
        }
@@ -724,7 +725,7 @@ static void route_mac(node_t *source, vpn_packet_t *packet) {
        if(via && packet->len > via->mtu && via != myself) {
                ifdebug(TRAFFIC) logger(LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu);
                uint16_t type = packet->data[12] << 8 | packet->data[13];
-               if(type == ETH_P_IP) {
+               if(type == ETH_P_IP && packet->len > 590) {
                        if(packet->data[20] & 0x40) {
                                packet->len = via->mtu;
                                route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED);
@@ -732,7 +733,7 @@ static void route_mac(node_t *source, vpn_packet_t *packet) {
                                fragment_ipv4_packet(via, packet);
                        }
                        return;
-               } else if(type == ETH_P_IPV6) {
+               } else if(type == ETH_P_IPV6 && packet->len > 1294) {
                        packet->len = via->mtu;
                        route_ipv6_unreachable(source, packet, ICMP6_PACKET_TOO_BIG, 0);
                        return;