- if (m->llmnr_ipv6_tcp_fd >= 0)
- return m->llmnr_ipv6_tcp_fd;
-
- m->llmnr_ipv6_tcp_fd = socket(AF_INET6, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (m->llmnr_ipv6_tcp_fd < 0)
- return -errno;
-
- /* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */
- r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
-
- r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
-
- r = setsockopt(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
-
- r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
-
- r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
-
- r = bind(m->llmnr_ipv6_tcp_fd, &sa.sa, sizeof(sa.in6));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
-
- r = listen(m->llmnr_ipv6_tcp_fd, SOMAXCONN);
- if (r < 0) {
- r = -errno;
- goto fail;
- }
-
- r = sd_event_add_io(m->event, &m->llmnr_ipv6_tcp_event_source, m->llmnr_ipv6_tcp_fd, EPOLLIN, on_llmnr_stream, m);
- if (r < 0) {
- r = -errno;
- goto fail;