neigh: use tbl->family to distinguish ipv4 from ipv6

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 60edd97..65ead08 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2947,12 +2947,13 @@
 };
 
 int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
-			  char *p_name, proc_handler *handler)
+			  proc_handler *handler)
 {
 	int i;
 	struct neigh_sysctl_table *t;
 	const char *dev_name_source;
 	char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ];
+	char *p_name;
 
 	t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL);
 	if (!t)
@@ -2991,6 +2992,17 @@
 	if (neigh_parms_net(p)->user_ns != &init_user_ns)
 		t->neigh_vars[0].procname = NULL;
 
+	switch (neigh_parms_family(p)) {
+	case AF_INET:
+	      p_name = "ipv4";
+	      break;
+	case AF_INET6:
+	      p_name = "ipv6";
+	      break;
+	default:
+	      BUG();
+	}
+
 	snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s",
 		p_name, dev_name_source);
 	t->sysctl_header =