diff --git a/inany.c b/inany.c
index edf0b05..c11e2aa 100644
--- a/inany.c
+++ b/inany.c
@@ -16,6 +16,22 @@
 #include "siphash.h"
 #include "inany.h"
 
+const union inany_addr inany_loopback4 = {
+	.v4mapped = {
+		.zero = { 0 },
+		.one = { 0xff, 0xff, },
+		.a4 = IN4ADDR_LOOPBACK_INIT,
+	},
+};
+
+const union inany_addr inany_any4 = {
+	.v4mapped = {
+		.zero = { 0 },
+		.one = { 0xff, 0xff, },
+		.a4 = IN4ADDR_ANY_INIT,
+	},
+};
+
 /** inany_ntop - Convert an IPv[46] address to text format
  * @src:	IPv[46] address
  * @dst:	output buffer, minimum INANY_ADDRSTRLEN bytes
diff --git a/inany.h b/inany.h
index be8b8da..84e82b0 100644
--- a/inany.h
+++ b/inany.h
@@ -32,6 +32,15 @@ static_assert(sizeof(union inany_addr) == sizeof(struct in6_addr),
 static_assert(_Alignof(union inany_addr) == _Alignof(uint32_t),
 	      "union inany_addr has unexpected alignment");
 
+#define inany_loopback6		(*(const union inany_addr *)(&in6addr_loopback))
+extern const union inany_addr inany_loopback4;
+
+#define inany_any6		(*(const union inany_addr *)(&in6addr_any))
+extern const union inany_addr inany_any4;
+
+#define in4addr_loopback	(inany_loopback4.v4mapped.a4)
+#define in4addr_any		(inany_any4.v4mapped.a4)
+
 /** inany_v4 - Extract IPv4 address, if present, from IPv[46] address
  * @addr:	IPv4 or IPv6 address
  *
diff --git a/tcp.c b/tcp.c
index 7be8355..dbe787b 100644
--- a/tcp.c
+++ b/tcp.c
@@ -2949,12 +2949,12 @@ static void tcp_ns_sock_init4(const struct ctx *c, in_port_t port)
 		.port = port + c->tcp.fwd_out.delta[port],
 		.pif = PIF_SPLICE,
 	};
-	struct in_addr loopback = IN4ADDR_LOOPBACK_INIT;
 	int s;
 
 	ASSERT(c->mode == MODE_PASTA);
 
-	s = sock_l4(c, AF_INET, IPPROTO_TCP, &loopback, NULL, port, tref.u32);
+	s = sock_l4(c, AF_INET, IPPROTO_TCP, &in4addr_loopback, NULL, port,
+		    tref.u32);
 	if (s >= 0)
 		tcp_sock_set_bufsize(c, s);
 	else
diff --git a/udp.c b/udp.c
index 5b7778e..de25eb0 100644
--- a/udp.c
+++ b/udp.c
@@ -96,6 +96,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <limits.h>
+#include <assert.h>
 #include <net/ethernet.h>
 #include <net/if.h>
 #include <netinet/in.h>
@@ -112,6 +113,8 @@
 
 #include "checksum.h"
 #include "util.h"
+#include "siphash.h"
+#include "inany.h"
 #include "passt.h"
 #include "tap.h"
 #include "pcap.h"
@@ -1017,9 +1020,8 @@ int udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
 			udp_tap_map[V4][uref.port].sock = s < 0 ? -1 : s;
 			udp_splice_init[V4][port].sock = s < 0 ? -1 : s;
 		} else {
-			struct in_addr loopback = IN4ADDR_LOOPBACK_INIT;
-
-			r4 = s = sock_l4(c, AF_INET, IPPROTO_UDP, &loopback,
+			r4 = s = sock_l4(c, AF_INET, IPPROTO_UDP,
+					 &in4addr_loopback,
 					 ifname, port, uref.u32);
 			udp_splice_ns[V4][port].sock = s < 0 ? -1 : s;
 		}