Keep track of the largest UDP packet size received from a node.
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4 changed files with 9 additions and 0 deletions
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@ -238,6 +238,7 @@ static void check_reachability(void) {
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n->status.udp_confirmed = false;
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n->maxmtu = MTU;
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n->maxrecentlen = 0;
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n->minmtu = 0;
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n->mtuprobes = 0;
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@ -95,6 +95,7 @@ static void udp_probe_timeout_handler(void *data) {
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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);
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n->status.udp_confirmed = false;
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n->maxrecentlen = 0;
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n->mtuprobes = 0;
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n->minmtu = 0;
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n->maxmtu = MTU;
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@ -387,6 +388,9 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) {
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origlen -= MTU/64 + 20;
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}
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if(inpkt->len > n->maxrecentlen)
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n->maxrecentlen = inpkt->len;
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inpkt->priority = 0;
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if(!DATA(inpkt)[12] && !DATA(inpkt)[13])
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@ -962,6 +966,7 @@ static void try_mtu(node_t *n) {
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return;
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if(udp_discovery && !n->status.udp_confirmed) {
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n->maxrecentlen = 0;
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n->mtuprobes = 0;
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n->minmtu = 0;
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n->maxmtu = MTU;
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@ -179,6 +179,7 @@ void update_node_udp(node_t *n, const sockaddr_t *sa) {
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/* invalidate UDP information - note that this is a security feature as well to make sure
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we can't be tricked into flooding any random address with UDP packets */
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n->status.udp_confirmed = false;
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n->maxrecentlen = 0;
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n->mtuprobes = 0;
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n->minmtu = 0;
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n->maxmtu = MTU;
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@ -93,6 +93,8 @@ typedef struct node_t {
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struct timeval mtu_ping_sent; /* Last time a MTU probe was sent */
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length_t maxrecentlen; /* Maximum size of recently received packets */
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length_t mtu; /* Maximum size of packets to send to this node */
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length_t minmtu; /* Probed minimum MTU */
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length_t maxmtu; /* Probed maximum MTU */
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