Fix dynamic UDP SPTPS relaying.

[tinc] / src / net_packet.c

diff --git a/src/net_packet.c b/src/net_packet.c
index 9e57df5..df87e27 100644 (file)
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -1125,23 +1125,31 @@ static void try_tx_sptps(node_t *n, bool mtu) {
 
        try_sptps(n);
 
-       /* Do we need to relay packets? */
+       /* Do we need to statically relay packets? */
 
        node_t *via = (n->via == myself) ? n->nexthop : n->via;
 
-       /* If the relay doesn't support SPTPS, everything goes via TCP anyway. */
+       /* If the static relay doesn't support SPTPS, everything goes via TCP anyway. */
 
        if((via->options >> 24) < 4)
                return;
 
-       /* If we do have a relay, try everything with that one instead. */
+       /* If we do have a static relay, try everything with that one instead. */
 
        if(via != n)
-               return try_tx_sptps(via, mtu);
+               try_tx_sptps(via, mtu);
+
+       /* Otherwise, try to establish UDP connectivity. */
 
        try_udp(n);
        if(mtu)
                try_mtu(n);
+
+       /* If we don't have UDP connectivity (yet), we need to use a dynamic relay (nexthop)
+          while we try to establish direct connectivity. */
+
+       if(!n->status.udp_confirmed && n != n->nexthop && (n->nexthop->options >> 24) >= 4)
+               try_tx_sptps(n->nexthop, mtu);
 }
 
 static void try_tx_legacy(node_t *n, bool mtu) {