MINOR: dns: new bitmasks to use against DNS flags

Current DNS client code implementation doesn't take care of response
flags setup by the server.
This patch introduces a couple of bitmasks one can use to retrieve the
truncated flag and the reply code available in the 2-bytes flag field.

diff --git a/include/types/dns.h b/include/types/dns.h
index d0a835d9b34cd1cdd0614bea0646e3ae487ec10d..589bb5dfd9661ef8c2862a65a5f56d895869f1a1 100644 (file)
--- a/include/types/dns.h
+++ b/include/types/dns.h
@@ -51,6 +51,10 @@
 #define DNS_RCODE_NX_DOMAIN    3       /* non existent domain */
 #define DNS_RCODE_REFUSED      5       /* query refused */
 
+/* dns flags masks */
+#define DNS_FLAG_TRUNCATED     0x0200  /* mask for truncated flag */
+#define DNS_FLAG_REPLYCODE     0x000F  /* mask for reply code */
+
 /* DNS request or response header structure */
 struct dns_header {
        unsigned short  id:16;          /* identifier */