Add UDP_INFO protocol message.

[tinc] / src / net_packet.c

diff --git a/src/net_packet.c b/src/net_packet.c
index 8dba325..40cb2ba 100644 (file)
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -1394,6 +1394,17 @@ skip_harder:
                        return;
                }
 
+               /* The packet is supposed to come from the originator or its static relay
+                  (i.e. with no dynamic relays in between).
+                  If it did not, "help" the static relay by sending it UDP info.
+                  Note that we only do this if we're the destination or the static relay;
+                  otherwise every hop would initiate its own UDP info message, resulting in elevated chatter. */
+
+               if(n != from->via && to->via == myself)
+                       send_udp_info(myself, from);
+
+               /* If we're not the final recipient, relay the packet. */
+
                if(to != myself) {
                        send_sptps_data_priv(to, n, 0, DATA(&pkt), pkt.len - 2 * sizeof(node_id_t));
                        try_tx_sptps(n, true);