Keep track of the largest UDP packet size received from a node.

[tinc] / src / net_packet.c

diff --git a/src/net_packet.c b/src/net_packet.c
index b2c6f90..96f8f10 100644 (file)
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -95,6 +95,7 @@ static void udp_probe_timeout_handler(void *data) {
 
        logger(DEBUG_TRAFFIC, LOG_INFO, "Too much time has elapsed since last UDP ping response from %s (%s), stopping UDP communication", n->name, n->hostname);
        n->status.udp_confirmed = false;
+       n->maxrecentlen = 0;
        n->mtuprobes = 0;
        n->minmtu = 0;
        n->maxmtu = MTU;
@@ -387,6 +388,9 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) {
                origlen -= MTU/64 + 20;
        }
 
+       if(inpkt->len > n->maxrecentlen)
+               n->maxrecentlen = inpkt->len;
+
        inpkt->priority = 0;
 
        if(!DATA(inpkt)[12] && !DATA(inpkt)[13])
@@ -962,6 +966,7 @@ static void try_mtu(node_t *n) {
                return;
 
        if(udp_discovery && !n->status.udp_confirmed) {
+               n->maxrecentlen = 0;
                n->mtuprobes = 0;
                n->minmtu = 0;
                n->maxmtu = MTU;