netconf: advertise mc_forwarding status

This patch advertise the MC_FORWARDING status for IPv4 and IPv6.
This field is readonly, only multicast engine in the kernel updates it.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h
index d032780..a9d8289 100644
--- a/include/linux/inetdevice.h
+++ b/include/linux/inetdevice.h
@@ -171,6 +171,9 @@
 extern int register_inetaddr_notifier(struct notifier_block *nb);
 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 
+extern void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
+					struct ipv4_devconf *devconf);
+
 extern struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
 {
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 9e63e76..df4ef94 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -172,6 +172,9 @@
 extern int register_inet6addr_notifier(struct notifier_block *nb);
 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 
+extern void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
+					 struct ipv6_devconf *devconf);
+
 /**
  * __in6_dev_get - get inet6_dev pointer from netdevice
  * @dev: network device
diff --git a/include/uapi/linux/netconf.h b/include/uapi/linux/netconf.h
index 75dcbc5..64804a7 100644
--- a/include/uapi/linux/netconf.h
+++ b/include/uapi/linux/netconf.h
@@ -13,6 +13,7 @@
 	NETCONFA_IFINDEX,
 	NETCONFA_FORWARDING,
 	NETCONFA_RP_FILTER,
+	NETCONFA_MC_FORWARDING,
 	__NETCONFA_MAX
 };
 #define NETCONFA_MAX	(__NETCONFA_MAX - 1)