polypath asymmetric routing: Handle data packet dupes

[secnet.git] / site.c

diff --git a/site.c b/site.c
index acbc2b62c99b9ed43e48b43a3d473becfdd404c3..51465011d1b6e1aa7a688eeae70d52d72653e1dc 100644 (file)
--- a/site.c
+++ b/site.c
@@ -1158,6 +1158,14 @@ static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
     transform_apply_return problem;
 
     problem = decrypt_msg0(st,msg0,src);
+    if (problem==transform_apply_seqdupe) {
+       /* We recently received another copy of this packet, maybe due
+        * to polypath.  That's not a problem; indeed, for the
+        * purposes of transport address management it is a success.
+        * But we don't want to process the packet. */
+       transport_data_msgok(st,src);
+       return False;
+    }
     if (problem)
        return False;