ipv4: export fib_check_nh

Change fib_check_nh to take net, table and scope as input arguments
over struct fib_config and export for use by nexthop code.
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip_fib.h

@@ -436,6 +436,8 @@ void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
 int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
 		       const struct sk_buff *skb, struct flow_keys *flkeys);
 #endif
+int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope,
+		 struct netlink_ext_ack *extack);
 void fib_select_multipath(struct fib_result *res, int hash);
 void fib_select_path(struct net *net, struct fib_result *res,
 		     struct flowi4 *fl4, const struct sk_buff *skb);

net/ipv4/fib_semantics.c

@@ -1092,15 +1092,13 @@ static int fib_check_nh_nongw(struct net *net, struct fib_nh *nh,
 	return err;
 }
 
-static int fib_check_nh(struct fib_config *cfg, struct fib_nh *nh,
+int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope,
 		 struct netlink_ext_ack *extack)
 {
-	struct net *net = cfg->fc_nlinfo.nl_net;
-	u32 table = cfg->fc_table;
 	int err;
 
 	if (nh->fib_nh_gw_family == AF_INET)
-		err = fib_check_nh_v4_gw(net, nh, table, cfg->fc_scope, extack);
+		err = fib_check_nh_v4_gw(net, nh, table, scope, extack);
 	else if (nh->fib_nh_gw_family == AF_INET6)
 		err = fib_check_nh_v6_gw(net, nh, table, extack);
 	else
@@ -1377,7 +1375,9 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
 		int linkdown = 0;
 
 		change_nexthops(fi) {
-			err = fib_check_nh(cfg, nexthop_nh, extack);
+			err = fib_check_nh(cfg->fc_nlinfo.nl_net, nexthop_nh,
+					   cfg->fc_table, cfg->fc_scope,
+					   extack);
 			if (err != 0)
 				goto failure;
 			if (nexthop_nh->fib_nh_flags & RTNH_F_LINKDOWN)