+ assert_not_reached("Unknown scope protocol");
+}
+
+int dns_scope_good_key(DnsScope *s, DnsResourceKey *key) {
+ assert(s);
+ assert(key);
+
+ if (s->protocol == DNS_PROTOCOL_DNS)
+ return true;
+
+ /* On mDNS and LLMNR, send A and AAAA queries only on the
+ * respective scopes */
+
+ if (s->family == AF_INET && key->class == DNS_CLASS_IN && key->type == DNS_TYPE_AAAA)
+ return false;
+
+ if (s->family == AF_INET6 && key->class == DNS_CLASS_IN && key->type == DNS_TYPE_A)
+ return false;
+
+ return true;
+}
+
+int dns_scope_llmnr_membership(DnsScope *s, bool b) {
+ int fd;
+
+ if (s->family == AF_INET) {
+ struct ip_mreqn mreqn = {
+ .imr_multiaddr = LLMNR_MULTICAST_IPV4_ADDRESS,
+ .imr_ifindex = s->link->ifindex,
+ };
+
+ fd = manager_llmnr_ipv4_udp_fd(s->manager);
+ if (fd < 0)
+ return fd;
+
+ if (setsockopt(fd, IPPROTO_IP, b ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP, &mreqn, sizeof(mreqn)) < 0)
+ return -errno;
+
+ } else if (s->family == AF_INET6) {
+ struct ipv6_mreq mreq = {
+ .ipv6mr_multiaddr = LLMNR_MULTICAST_IPV6_ADDRESS,
+ .ipv6mr_interface = s->link->ifindex,
+ };
+
+ fd = manager_llmnr_ipv6_udp_fd(s->manager);
+ if (fd < 0)
+ return fd;
+
+ if (setsockopt(fd, IPPROTO_IPV6, b ? IPV6_ADD_MEMBERSHIP : IPV6_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0)
+ return -errno;
+ } else
+ return -EAFNOSUPPORT;
+
+ return 0;