2 files changed, 24 insertions, 0 deletions

diff --git a/include/linux/inet.h b/include/linux/inet.h
index 636ebe87e6f8..97defc1139e9 100644
--- a/include/linux/inet.h
+++ b/include/linux/inet.h
@@ -59,5 +59,6 @@ extern int in6_pton(const char *src, int srclen, u8 *dst, int delim, const char
 
 extern int inet_pton_with_scope(struct net *net, unsigned short af,
                 const char *src, const char *port, struct sockaddr_storage *addr);
+extern bool inet_addr_is_any(struct sockaddr *addr);
 
 #endif  /* _LINUX_INET_H */
diff --git a/net/core/utils.c b/net/core/utils.c
index 93066bd0305a..d47863b07a60 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -403,6 +403,29 @@ int inet_pton_with_scope(struct net *net, __kernel_sa_family_t af,
 }
 EXPORT_SYMBOL(inet_pton_with_scope);
 
+bool inet_addr_is_any(struct sockaddr *addr)
+{
+        if (addr->sa_family == AF_INET6) {
+                struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)addr;
+                const struct sockaddr_in6 in6_any =
+                        { .sin6_addr = IN6ADDR_ANY_INIT };
+
+                if (!memcmp(in6->sin6_addr.s6_addr,
+                            in6_any.sin6_addr.s6_addr, 16))
+                        return true;
+        } else if (addr->sa_family == AF_INET) {
+                struct sockaddr_in *in = (struct sockaddr_in *)addr;
+
+                if (in->sin_addr.s_addr == htonl(INADDR_ANY))
+                        return true;
+        } else {
+                pr_warn("unexpected address family %u\n", addr->sa_family);
+        }
+
+        return false;
+}
+EXPORT_SYMBOL(inet_addr_is_any);
+
 void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
                               __be32 from, __be32 to, bool pseudohdr)
 {