ip: fix path MTU node errors definition

The path mtu node uses errors defined by ip fragmentation.

Type: fix

Change-Id: I1f173955919a4f555ab0309cd8201ec342a0ae92
Signed-off-by: Benoît Ganne <bganne@cisco.com>
diff --git a/src/vnet/ip/ip_frag.c b/src/vnet/ip/ip_frag.c
index cafa9a6..b9bc90d 100644
--- a/src/vnet/ip/ip_frag.c
+++ b/src/vnet/ip/ip_frag.c
@@ -502,7 +502,7 @@
   return IP_FRAG_ERROR_NONE;
 }
 
-static char *ip4_frag_error_strings[] = {
+char *ip4_frag_error_strings[] = {
 #define _(sym,string) string,
   foreach_ip_frag_error
 #undef _
diff --git a/src/vnet/ip/ip_frag.h b/src/vnet/ip/ip_frag.h
index 86462e6..ac562c9 100644
--- a/src/vnet/ip/ip_frag.h
+++ b/src/vnet/ip/ip_frag.h
@@ -76,6 +76,8 @@
     IP_FRAG_N_ERROR,
 } ip_frag_error_t;
 
+extern char *ip4_frag_error_strings[];
+
 void ip_frag_set_vnet_buffer (vlib_buffer_t * b, u16 mtu,
 			      u8 next_index, u8 flags);
 
diff --git a/src/vnet/ip/ip_path_mtu_node.c b/src/vnet/ip/ip_path_mtu_node.c
index b13f9de..33be4bb 100644
--- a/src/vnet/ip/ip_path_mtu_node.c
+++ b/src/vnet/ip/ip_path_mtu_node.c
@@ -176,7 +176,8 @@
   .name = "ip4-pmtu-dpo",
   .vector_size = sizeof (u32),
   .format_trace = format_ip_pmtu_trace,
-  .n_errors = 0,
+  .n_errors = IP_FRAG_N_ERROR,
+  .error_strings = ip4_frag_error_strings,
   .n_next_nodes = IP_PMTU_N_NEXT,
   .next_nodes =
   {
@@ -187,7 +188,8 @@
   .name = "ip6-pmtu-dpo",
   .vector_size = sizeof (u32),
   .format_trace = format_ip_pmtu_trace,
-  .n_errors = 0,
+  .n_errors = IP_FRAG_N_ERROR,
+  .error_strings = ip4_frag_error_strings,
   .n_next_nodes = IP_PMTU_N_NEXT,
   .next_nodes =
   {