From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 18 May 2021 03:56:23 +0000 (+0900)
Subject: in-addr-util: introduce in6_addr_is_ipv4_mapped_address()
X-Git-Tag: v249-rc1~76^2~44
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=c3e960883fe9de98c8a0d6a876d222a7156c33bb;p=thirdparty%2Fsystemd.git

in-addr-util: introduce in6_addr_is_ipv4_mapped_address()
---

diff --git a/src/basic/in-addr-util.c b/src/basic/in-addr-util.c
index 9d7e51f8fd7..9cc92a1c767 100644
--- a/src/basic/in-addr-util.c
+++ b/src/basic/in-addr-util.c
@@ -121,6 +121,12 @@ int in_addr_is_localhost(int family, const union in_addr_union *u) {
         return -EAFNOSUPPORT;
 }
 
+bool in6_addr_is_ipv4_mapped_address(const struct in6_addr *a) {
+        return a->s6_addr32[0] == 0 &&
+                a->s6_addr32[1] == 0 &&
+                a->s6_addr32[2] == htobe32(UINT32_C(0x0000ffff));
+}
+
 bool in4_addr_equal(const struct in_addr *a, const struct in_addr *b) {
         assert(a);
         assert(b);
diff --git a/src/basic/in-addr-util.h b/src/basic/in-addr-util.h
index 906b3fe97e5..f3ead919623 100644
--- a/src/basic/in-addr-util.h
+++ b/src/basic/in-addr-util.h
@@ -58,6 +58,7 @@ 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 in6_addr_is_ipv4_mapped_address(const struct in6_addr *a);
 
 bool in4_addr_equal(const struct in_addr *a, const struct in_addr *b);
 bool in6_addr_equal(const struct in6_addr *a, const struct in6_addr *b);