- check for to_origin duplicates

1 files changed, 16 insertions, 1 deletions

diff --git a/src/mesh/gnunet-service-mesh.c b/src/mesh/gnunet-service-mesh.c
index 1792faee8..006cc3b38 100644
--- a/src/mesh/gnunet-service-mesh.c
+++ b/src/mesh/gnunet-service-mesh.c
@@ -5742,7 +5742,6 @@ handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
               GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
   t = tunnel_get (&msg->oid, ntohl (msg->tid));
-  pid = ntohl (msg->pid);
 
   if (NULL == t)
   {
@@ -5755,6 +5754,22 @@ handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
     return GNUNET_OK;
   }
 
+  pid = ntohl (msg->pid);
+  if (t->bck_pid == pid)
+  {
+    /* already seen this packet, drop */
+    GNUNET_STATISTICS_update (stats, "# duplicate PID drops BCK", 1, GNUNET_NO);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                " Already seen pid %u, DROPPING!\n", pid);
+    tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
+    return GNUNET_OK;
+  }
+  else
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                " pid %u not seen yet, forwarding\n", pid);
+  }
+
   if (NULL != t->owner)
   {
     char cbuf[size];