From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 15 Sep 2020 06:34:22 +0000 (+0900)
Subject: in-addr-util: introduce in4_addr_is_local_multicast()
X-Git-Tag: v247-rc1~221^2~5
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ccea2448652cddb2d9ff492e1870432461128c7c;p=thirdparty%2Fsystemd.git

in-addr-util: introduce in4_addr_is_local_multicast()
---

diff --git a/src/basic/in-addr-util.c b/src/basic/in-addr-util.c
index ceb7b113d91..c102504fdd5 100644
--- a/src/basic/in-addr-util.c
+++ b/src/basic/in-addr-util.c
@@ -76,6 +76,12 @@ int in_addr_is_multicast(int family, const union in_addr_union *u) {
         return -EAFNOSUPPORT;
 }
 
+bool in4_addr_is_local_multicast(const struct in_addr *a) {
+        assert(a);
+
+        return (be32toh(a->s_addr) & UINT32_C(0xffffff00)) == UINT32_C(0xe0000000);
+}
+
 bool in4_addr_is_localhost(const struct in_addr *a) {
         assert(a);
 
diff --git a/src/basic/in-addr-util.h b/src/basic/in-addr-util.h
index e22ca3b945d..45c93a0056f 100644
--- a/src/basic/in-addr-util.h
+++ b/src/basic/in-addr-util.h
@@ -32,6 +32,7 @@ bool in6_addr_is_link_local_all_nodes(const struct in6_addr *a);
 bool in4_addr_is_localhost(const struct in_addr *a);
 int in_addr_is_localhost(int family, const union in_addr_union *u);
 
+bool in4_addr_is_local_multicast(const struct in_addr *a);
 bool in4_addr_is_non_local(const struct in_addr *a);
 
 bool in4_addr_equal(const struct in_addr *a, const struct in_addr *b);