From: Ido Schimmel <idosch@mellanox.com>
Date: Wed, 17 Oct 2018 08:53:10 +0000
Subject: vxlan: Export address checking functions
Patch-mainline: v4.20-rc1
Git-commit: cca45e054ce55c06046a37bf4d3fd7c17edd57da
References: bsc#1112374

Drivers that support VxLAN offload need to be able to sanitize the
configuration of the VxLAN device and accept / reject its offload.

For example, mlxsw requires that the local IP of the VxLAN device be set
and that packets be flooded to unicast IP(s) and not to a multicast
group.

Expose the functions that perform such checks.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/vxlan.c |   26 --------------------------
 include/net/vxlan.h |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 26 deletions(-)

--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -102,22 +102,6 @@ bool vxlan_addr_equal(const union vxlan_
 		return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 }
 
-static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
-{
-	if (ipa->sa.sa_family == AF_INET6)
-		return ipv6_addr_any(&ipa->sin6.sin6_addr);
-	else
-		return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
-}
-
-static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
-{
-	if (ipa->sa.sa_family == AF_INET6)
-		return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
-	else
-		return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
-}
-
 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 {
 	if (nla_len(nla) >= sizeof(struct in6_addr)) {
@@ -150,16 +134,6 @@ bool vxlan_addr_equal(const union vxlan_
 	return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 }
 
-static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
-{
-	return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
-}
-
-static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
-{
-	return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
-}
-
 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 {
 	if (nla_len(nla) >= sizeof(struct in6_addr)) {
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -374,4 +374,36 @@ static inline unsigned short vxlan_get_s
 	return vs->sock->sk->sk_family;
 }
 
+#if IS_ENABLED(CONFIG_IPV6)
+
+static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
+{
+	if (ipa->sa.sa_family == AF_INET6)
+		return ipv6_addr_any(&ipa->sin6.sin6_addr);
+	else
+		return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
+}
+
+static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
+{
+	if (ipa->sa.sa_family == AF_INET6)
+		return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
+	else
+		return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
+}
+
+#else /* !IS_ENABLED(CONFIG_IPV6) */
+
+static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
+{
+	return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
+}
+
+static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
+{
+	return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
+}
+
+#endif /* IS_ENABLED(CONFIG_IPV6) */
+
 #endif