FIB2.0: memory leaks during load-balance update (VPP-475)

[vpp.git] / vnet / vnet / ip / ip6_neighbor.c

diff --git a/vnet/vnet/ip/ip6_neighbor.c b/vnet/vnet/ip/ip6_neighbor.c
index 57359f7..fdec2d4 100644 (file)
--- a/vnet/vnet/ip/ip6_neighbor.c
+++ b/vnet/vnet/ip/ip6_neighbor.c
@@ -427,6 +427,17 @@ vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
     n->key = k;
     n->adj_index = ADJ_INDEX_INVALID;
   }
+  else
+  {
+    /*
+     * prevent a DoS attack from the data-plane that
+     * spams us with no-op updates to the MAC address
+     */
+    if (0 == memcmp(n->link_layer_address,
+                   link_layer_address,
+                   n_bytes_link_layer_address))
+      return -1;
+  }
 
   /* Update time stamp and ethernet address. */
   clib_memcpy (n->link_layer_address,