map: handle ip4 ttl=1 packets in map-t

[vpp.git] / src / plugins / map / ip4_map_t.c

diff --git a/src/plugins/map/ip4_map_t.c b/src/plugins/map/ip4_map_t.c
index d243a45..bb5aa45 100644 (file)
--- a/src/plugins/map/ip4_map_t.c
+++ b/src/plugins/map/ip4_map_t.c
@@ -578,6 +578,16 @@ ip4_map_t (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
 
          dst_port0 = -1;
 
+         if (PREDICT_FALSE (ip40->ttl == 1))
+           {
+             icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
+                                          ICMP4_time_exceeded_ttl_exceeded_in_transit,
+                                          0);
+             p0->error = error_node->errors[MAP_ERROR_TIME_EXCEEDED];
+             next0 = IP4_MAPT_NEXT_ICMP_ERROR;
+             goto trace;
+           }
+
          bool df0 =
            ip40->flags_and_fragment_offset &
            clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);