+#ifdef IP_RECVTTL
+ yes = 1;
+ if (setsockopt(fd, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0) {
+ avahi_log_warn("IP_RECVTTL failed: %s", strerror(errno));
+ return -1;
+ }
+#endif
+
+ return 0;
+}
+
+static int ipv6_pktinfo(int fd) {
+ int yes;
+
+#ifdef IPV6_RECVPKTINFO
+ yes = 1;
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0) {
+ avahi_log_warn("IPV6_RECVPKTINFO failed: %s", strerror(errno));
+ return -1;
+ }
+#elif defined(IPV6_PKTINFO)
+ yes = 1;
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_PKTINFO, &yes, sizeof(yes)) < 0) {
+ avahi_log_warn("IPV6_PKTINFO failed: %s", strerror(errno));
+ return -1;
+ }
+#endif
+
+#ifdef IPV6_RECVHOPS
+ yes = 1;
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVHOPS, &yes, sizeof(yes)) < 0) {
+ avahi_log_warn("IPV6_RECVHOPS failed: %s", strerror(errno));
+ return -1;
+ }
+#elif defined(IPV6_RECVHOPLIMIT)
+ yes = 1;
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &yes, sizeof(yes)) < 0) {
+ avahi_log_warn("IPV6_RECVHOPLIMIT failed: %s", strerror(errno));
+ return -1;
+ }
+#elif defined(IPV6_HOPLIMIT)
+ yes = 1;
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_HOPLIMIT, &yes, sizeof(yes)) < 0) {
+ avahi_log_warn("IPV6_HOPLIMIT failed: %s", strerror(errno));
+ return -1;
+ }
+#endif
+
+ return 0;