1 files changed, 19 insertions, 0 deletions
diff --git a/udp.c b/udp.c
index 41a6247..bd9051e 100644
--- a/udp.c
+++ b/udp.c
@@ -723,6 +723,25 @@ int udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
 	else
 		uref.pif = PIF_HOST;
 
+	if (af == AF_UNSPEC && c->ifi4 && c->ifi6) {
+		int s;
+
+		/* Attempt to get a dual stack socket */
+		if (!ns) {
+			s = sock_l4(c, AF_UNSPEC, EPOLL_TYPE_UDP_LISTEN,
+				    addr, ifname, port, uref.u32);
+			udp_splice_init[V4][port] = s < 0 ? -1 : s;
+			udp_splice_init[V6][port] = s < 0 ? -1 : s;
+		} else {
+			s = sock_l4(c, AF_UNSPEC, EPOLL_TYPE_UDP_LISTEN,
+				    &in4addr_loopback, ifname, port, uref.u32);
+			udp_splice_ns[V4][port] = s < 0 ? -1 : s;
+			udp_splice_ns[V6][port] = s < 0 ? -1 : s;
+		}
+		if (IN_INTERVAL(0, FD_REF_MAX, s))
+			return 0;
+	}
+
 	if ((af == AF_INET || af == AF_UNSPEC) && c->ifi4) {
 		if (!ns) {
 			r4 = sock_l4(c, AF_INET, EPOLL_TYPE_UDP_LISTEN,