From: Guus Sliepen <guus@meshlink.io>
Date: Sat, 18 Jul 2020 12:23:56 +0000 (+0200)
Subject: Send a PING packet on a meta-connection if a UDP ping failed.
X-Git-Url: http://git.meshlink.io/?p=meshlink;a=commitdiff_plain;h=0669c133ef0150e9772711588651c1c4d8e45267

Send a PING packet on a meta-connection if a UDP ping failed.

If we lost a UDP ping packet, it might mean the node is down. We need to
confirm that with a PING on the meta-connection.
---

diff --git a/src/pmtu.c b/src/pmtu.c
index 4073825c..d91919ee 100644
--- a/src/pmtu.c
+++ b/src/pmtu.c
@@ -93,6 +93,13 @@ static void udp_probe_timeout_handler(event_loop_t *loop, void *data) {
 	n->mtuprobes = 0;
 	n->minmtu = 0;
 	n->maxmtu = MTU;
+
+	// If we also have a meta-connection to this node, send a PING on it as well
+	connection_t *c = n->connection;
+
+	if(c && !c->status.pinged) {
+		send_ping(mesh, c);
+	}
 }
 
 static void send_udp_probe_reply(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *packet, uint16_t len) {