map: fix DF[Don't fragment] ip4-map-t behaviour
This patch allows ip4-map-t plugin to drop
packets if DF flag is set and packet size
is bigger than MTU
Type: fix
@@ -600,6 +600,17 @@ ip4_map_t (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
pheader0->daddr.as_u64[1] =
map_get_sfx_net (d0, ip40->dst_address.as_u32, (u16) dst_port0);
+ bool df0 =
+ ip40->flags_and_fragment_offset &
+ clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);
+
+ if (PREDICT_TRUE (ip4_is_first_fragment (ip40) && df0))
+ {
+ p0->error = error_node->errors[MAP_ERROR_FRAGMENT_DROPPED];
+ next0 = IP4_MAPT_NEXT_MAPT_FRAGMENTED;
+ goto exit;
+ }
+
if (PREDICT_TRUE
(error0 == MAP_ERROR_NONE && next0 != IP4_MAPT_NEXT_MAPT_ICMP))
{
