From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 15 Sep 2020 06:33:56 +0000 (+0900)
Subject: in-addr-util: introduce in6_addr_is_link_local_all_nodes()
X-Git-Tag: v247-rc1~221^2~6
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=5643cfc0d94fcc3865f35848b9eb35b89660c817;p=thirdparty%2Fsystemd.git

in-addr-util: introduce in6_addr_is_link_local_all_nodes()
---

diff --git a/src/basic/in-addr-util.c b/src/basic/in-addr-util.c
index 8783ab3c9b0..ceb7b113d91 100644
--- a/src/basic/in-addr-util.c
+++ b/src/basic/in-addr-util.c
@@ -54,6 +54,16 @@ int in_addr_is_link_local(int family, const union in_addr_union *u) {
         return -EAFNOSUPPORT;
 }
 
+bool in6_addr_is_link_local_all_nodes(const struct in6_addr *a) {
+        assert(a);
+
+        /* ff02::1 */
+        return be32toh(a->s6_addr32[0]) == UINT32_C(0xff020000) &&
+                a->s6_addr32[1] == 0 &&
+                a->s6_addr32[2] == 0 &&
+                be32toh(a->s6_addr32[3]) == UINT32_C(0x00000001);
+}
+
 int in_addr_is_multicast(int family, const union in_addr_union *u) {
         assert(u);
 
diff --git a/src/basic/in-addr-util.h b/src/basic/in-addr-util.h
index e5df2a8058b..e22ca3b945d 100644
--- a/src/basic/in-addr-util.h
+++ b/src/basic/in-addr-util.h
@@ -27,6 +27,7 @@ int in_addr_is_multicast(int family, const union in_addr_union *u);
 
 bool in4_addr_is_link_local(const struct in_addr *a);
 int in_addr_is_link_local(int family, const union in_addr_union *u);
+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);