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-rw-r--r--src/plugins/ct6/ct6_in2out.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/src/plugins/ct6/ct6_in2out.c b/src/plugins/ct6/ct6_in2out.c
index b28d349dd29..4f2ebae60cf 100644
--- a/src/plugins/ct6/ct6_in2out.c
+++ b/src/plugins/ct6/ct6_in2out.c
@@ -235,7 +235,10 @@ ct6_in2out_inline (vlib_main_t * vm,
/*
* This is an output feature which runs at the last possible
- * moment. Assume an ethernet header.
+ * moment. Assume an ethernet header. Make sure the packet is
+ * actually ipv6 before we do anything else.
+ *
+ * Unfortunately, we have to re-parse the L2 header.
*/
e0 = vlib_buffer_get_current (b[0]);
@@ -245,6 +248,18 @@ ct6_in2out_inline (vlib_main_t * vm,
delta0 += (e0->type == clib_net_to_host_u16 (ETHERNET_TYPE_DOT1AD))
? 8 : 0;
+ if (PREDICT_TRUE (delta0 == sizeof (*e0)))
+ {
+ if (e0->type != clib_host_to_net_u16 (ETHERNET_TYPE_IP6))
+ goto trace0;
+ }
+ else
+ {
+ u16 *tagged_etype_ptr = vlib_buffer_get_current (b[0]) + delta0 - 2;
+ if (*tagged_etype_ptr != clib_host_to_net_u16 (ETHERNET_TYPE_IP6))
+ goto trace0;
+ }
+
ip0 = (ip6_header_t *) (vlib_buffer_get_current (b[0]) + delta0);
/*