treewide: Add IN4ADDR_ANY_INIT macro

We already define IN4ADDR_LOOPBACK_INIT to initialise a struct in_addr to
the loopback address, make a similar one for the unspecified / any address.
This avoids messying things with the internal structure of struct in_addr
where we don't care about it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

2 files changed, 4 insertions, 1 deletions

diff --git a/icmp.c b/icmp.c
index a1de8ae..2a15d25 100644
--- a/icmp.c
+++ b/icmp.c
@@ -169,7 +169,7 @@ int icmp_tap_handler(const struct ctx *c, uint8_t pif, int af,
 	if (af == AF_INET) {
 		struct sockaddr_in sa = {
 			.sin_family = AF_INET,
-			.sin_addr = { .s_addr = htonl(INADDR_ANY) },
+			.sin_addr = IN4ADDR_ANY_INIT,
 		};
 		union icmp_epoll_ref iref;
 		struct icmphdr *ih;
diff --git a/util.h b/util.h
index 9446ea7..fb8c3f1 100644
--- a/util.h
+++ b/util.h
@@ -122,6 +122,9 @@
 	(((struct in_addr *)(a))->s_addr == ((struct in_addr *)b)->s_addr)
 #define IN4ADDR_LOOPBACK_INIT \
 	{ .s_addr	= htonl_constant(INADDR_LOOPBACK) }
+#define IN4ADDR_ANY_INIT \
+	{ .s_addr	= htonl_constant(INADDR_ANY) }
+
 
 #define NS_FN_STACK_SIZE	(RLIMIT_STACK_VAL * 1024 / 8)
 int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size, int flags,