X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fplugins%2Fnat%2Fnat.c;h=2ed65a13974f6ecd731f65b018e4762500ebb547;hb=e4e34c23fe7050c26967997fdb8f555c51fd3961;hp=959abd7ebbf1ff68efbf09f82165d593b922a126;hpb=4b65ddf42899a8d23126857c5722c8b909212b3e;p=vpp.git

diff --git a/src/plugins/nat/nat.c b/src/plugins/nat/nat.c
index 959abd7ebbf..2ed65a13974 100644
--- a/src/plugins/nat/nat.c
+++ b/src/plugins/nat/nat.c
@@ -1428,6 +1428,12 @@ int snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del)
   if (sm->out2in_dpo && !is_inside)
     return VNET_API_ERROR_UNSUPPORTED;
 
+  pool_foreach (i, sm->output_feature_interfaces,
+  ({
+    if (i->sw_if_index == sw_if_index)
+      return VNET_API_ERROR_VALUE_EXIST;
+  }));
+
   if (sm->static_mapping_only && !(sm->static_mapping_connection_tracking))
     feature_name = is_inside ?  "nat44-in2out-fast" : "nat44-out2in-fast";
   else
@@ -1579,6 +1585,12 @@ int snat_interface_add_del_output_feature (u32 sw_if_index,
       (sm->static_mapping_only && !(sm->static_mapping_connection_tracking)))
     return VNET_API_ERROR_UNSUPPORTED;
 
+  pool_foreach (i, sm->interfaces,
+  ({
+    if (i->sw_if_index == sw_if_index)
+      return VNET_API_ERROR_VALUE_EXIST;
+  }));
+
   if (is_inside)
     {
       vnet_feature_enable_disable ("ip4-unicast", "nat44-hairpin-dst",