[PATCH 2/8] treewide: Use IN4ADDR_LOOPBACK_INIT more widely

[David Gibson <david@gibson.dropbear.id.au>]

We already define IN4ADDR_LOOPBACK_INIT to initialise a struct in_addr to
the loopback address without delving into its internals.  However there are
some places we don't use it, and explicitly look at the internal structure
of struct in_addr, which we generally want to avoid.  Use the define more
widely to avoid that.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 tcp.c        | 2 +-
 tcp_splice.c | 2 +-
 udp.c        | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tcp.c b/tcp.c
index bda95b2..466b0ca 100644
--- a/tcp.c
+++ b/tcp.c
@@ -2973,7 +2973,7 @@ 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 = { htonl(INADDR_LOOPBACK) };
+	struct in_addr loopback = IN4ADDR_LOOPBACK_INIT;
 	int s;
 
 	ASSERT(c->mode == MODE_PASTA);
diff --git a/tcp_splice.c b/tcp_splice.c
index 69ea79d..1655f8e 100644
--- a/tcp_splice.c
+++ b/tcp_splice.c
@@ -347,7 +347,7 @@ static int tcp_splice_connect(const struct ctx *c, struct tcp_splice_conn *conn,
 	struct sockaddr_in addr4 = {
 		.sin_family = AF_INET,
 		.sin_port = htons(port),
-		.sin_addr = { .s_addr = htonl(INADDR_LOOPBACK) },
+		.sin_addr = IN4ADDR_LOOPBACK_INIT,
 	};
 	const struct sockaddr *sa;
 	socklen_t sl;
diff --git a/udp.c b/udp.c
index 1f8c306..489a843 100644
--- a/udp.c
+++ b/udp.c
@@ -429,7 +429,7 @@ int udp_splice_new(const struct ctx *c, int v6, in_port_t src, bool ns)
 		struct sockaddr_in addr4 = {
 			.sin_family = AF_INET,
 			.sin_port = htons(src),
-			.sin_addr = { .s_addr = htonl(INADDR_LOOPBACK) },
+			.sin_addr = IN4ADDR_LOOPBACK_INIT,
 		};
 		if (bind(s, (struct sockaddr *)&addr4, sizeof(addr4)))
 			goto fail;
@@ -1012,7 +1012,7 @@ 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 = { htonl(INADDR_LOOPBACK) };
+			struct in_addr loopback = IN4ADDR_LOOPBACK_INIT;
 
 			r4 = s = sock_l4(c, AF_INET, IPPROTO_UDP, &loopback,
 					 ifname, port, uref.u32);
-- 
@@ -429,7 +429,7 @@ int udp_splice_new(const struct ctx *c, int v6, in_port_t src, bool ns)
 		struct sockaddr_in addr4 = {
 			.sin_family = AF_INET,
 			.sin_port = htons(src),
-			.sin_addr = { .s_addr = htonl(INADDR_LOOPBACK) },
+			.sin_addr = IN4ADDR_LOOPBACK_INIT,
 		};
 		if (bind(s, (struct sockaddr *)&addr4, sizeof(addr4)))
 			goto fail;
@@ -1012,7 +1012,7 @@ 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 = { htonl(INADDR_LOOPBACK) };
+			struct in_addr loopback = IN4ADDR_LOOPBACK_INIT;
 
 			r4 = s = sock_l4(c, AF_INET, IPPROTO_UDP, &loopback,
 					 ifname, port, uref.u32);
-- 
2.43.0