openflow_input: add type values
diff --git a/openflow_input/bsn_ip_mask b/openflow_input/bsn_ip_mask
index c8b3bd8..b6d517b 100644
--- a/openflow_input/bsn_ip_mask
+++ b/openflow_input/bsn_ip_mask
@@ -29,11 +29,11 @@
 
 struct of_bsn_set_ip_mask {
     uint8_t version;
-    uint8_t type;
+    uint8_t type == 4;
     uint16_t length;
     uint32_t xid;
-    uint32_t experimenter;  // bsn 0x005c16c7,
-    uint32_t subtype;       // 0
+    uint32_t experimenter == 0x5c16c7;
+    uint32_t subtype == 0;
     uint8_t index;
     pad(3);
     uint32_t mask;
@@ -41,22 +41,22 @@
 
 struct of_bsn_get_ip_mask_request {
     uint8_t version;
-    uint8_t type;
+    uint8_t type == 4;
     uint16_t length;
     uint32_t xid;
-    uint32_t experimenter;  // bsn 0x005c16c7,
-    uint32_t subtype;       // 1
+    uint32_t experimenter == 0x5c16c7;
+    uint32_t subtype == 1;
     uint8_t index;
     pad(7);
 };
 
 struct of_bsn_get_ip_mask_reply {
     uint8_t version;
-    uint8_t type;
+    uint8_t type == 4;
     uint16_t length;
     uint32_t xid;
-    uint32_t experimenter;  // bsn 0x005c16c7,
-    uint32_t subtype;       // 2
+    uint32_t experimenter == 0x5c16c7;
+    uint32_t subtype == 2;
     uint8_t index;
     pad(3);
     uint32_t mask;