basic: add explicit ipv4-specific in_addr classification calls

This adds in4_addr_is_localhost() and in4_addr_is_link_local() that only take
an IPv4 "struct in_addr", to match in_addr_is_localhost() and
in_addr_is_link_local() that that a "union in_addr_union".

This matches the existing in4_addr_is_null() call that already exists.

For IPv6 glibc already exports a set of macros, hence we don't add similar
functions in6_addr_is_localhost(). We also drop in6_addr_is_null() as
IN6_IS_ADDR_UNSPECIFIED() already provides that.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libsystemd-network/ndisc-router.c b/src/libsystemd-network/ndisc-router.c
index 41ff2b353a..cf56c89d76 100644
--- a/src/libsystemd-network/ndisc-router.c
+++ b/src/libsystemd-network/ndisc-router.c
@@ -91,7 +91,7 @@ _public_ int sd_ndisc_router_get_address(sd_ndisc_router *rt, struct in6_addr *r
         assert_return(rt, -EINVAL);
         assert_return(ret_addr, -EINVAL);
 
-        if (in6_addr_is_null(&rt->address))
+        if (IN6_IS_ADDR_UNSPECIFIED(&rt->address))
                 return -ENODATA;
 
         *ret_addr = rt->address;