h = DNS_PACKET_HEADER(p);
- if (protocol == DNS_PROTOCOL_DNS)
- h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0, 0, 0, 0, 1, 0, 0, 0, 0)); /* ask for recursion */
+ if (protocol == DNS_PROTOCOL_LLMNR)
+ h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */,
+ 0 /* opcode */,
+ 0 /* c */,
+ 0 /* tc */,
+ 0 /* t */,
+ 0 /* ra */,
+ 0 /* ad */,
+ 0 /* cd */,
+ 0 /* rcode */));
else
- h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0, 0, 0, 0, 0, 0, 0, 0, 0));
+ h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */,
+ 0 /* opcode */,
+ 0 /* aa */,
+ 0 /* tc */,
+ 1 /* rd (ask for recursion) */,
+ 0 /* ra */,
+ 0 /* ad */,
+ 0 /* cd */,
+ 0 /* rcode */));
*ret = p;
return 0;
if (DNS_PACKET_OPCODE(p) != 0)
return -EBADMSG;
+ /* RFC 4795, Section 2.1.1. says to discard all replies with QDCOUNT != 1 */
+ if (p->protocol == DNS_PROTOCOL_LLMNR &&
+ DNS_PACKET_QDCOUNT(p) != 1)
+ return -EBADMSG;
+
return 1;
}
if (DNS_PACKET_TC(p))
return -EBADMSG;
+ /* RFC 4795, Section 2.1.1. says to discard all queries with QDCOUNT != 1 */
if (p->protocol == DNS_PROTOCOL_LLMNR &&
DNS_PACKET_QDCOUNT(p) != 1)
return -EBADMSG;
+ /* RFC 4795, Section 2.1.1. says to discard all queries with ANCOUNT != 0 */
if (DNS_PACKET_ANCOUNT(p) > 0)
return -EBADMSG;
+ /* RFC 4795, Section 2.1.1. says to discard all queries with NSCOUNT != 0 */
if (DNS_PACKET_NSCOUNT(p) > 0)
return -EBADMSG;