Add rate limit to l2gre vport.
diff --git a/openflow_input/bsn_vport b/openflow_input/bsn_vport
index 4f06462..6137a57 100644
--- a/openflow_input/bsn_vport
+++ b/openflow_input/bsn_vport
@@ -50,6 +50,8 @@
     OF_BSN_VPORT_L2GRE_DSCP_COPY = 0x4,
 
     OF_BSN_VPORT_L2GRE_LOOPBACK_IS_VALID = 0x8,
+
+    OF_BSN_VPORT_L2GRE_RATE_LIMIT_IS_VALID = 0x10,
 };
 
 // BSN Virtual port object header
@@ -91,6 +93,7 @@
     uint8_t ttl;
     pad(2);
     uint32_t vpn;                   /* VPN ID (for GRE Key) */
+    uint32_t rate_limit;            /* Rate limit in Kbps */
     of_port_name_t if_name;         /* Virtual Interface Name */
 };