Merge into master from pull request #361:
add ipv4_netmask tlv (https://github.com/floodlight/loxigen/pull/361)
diff --git a/openflow_input/bsn_tlv b/openflow_input/bsn_tlv
index 16637cd..21325ae 100644
--- a/openflow_input/bsn_tlv
+++ b/openflow_input/bsn_tlv
@@ -394,3 +394,9 @@
     uint16_t length;
     uint32_t value; /* Milliseconds */
 };
+
+struct of_bsn_tlv_ipv4_netmask : of_bsn_tlv {
+    uint16_t type == 60;
+    uint16_t length;
+    of_ipv4_t value;
+};