netfilter: connlimit: merge root4 and root6.

The root4 variable is used only when connlimit extension module has been
stored by the iptables command. and the roo6 variable is used only when
connlimit extension module has been stored by the ip6tables command.
So the root4 and roo6 variable does not be used at the same time.
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/xt_connlimit.c

@@ -58,8 +58,7 @@ struct xt_connlimit_rb {
 static spinlock_t xt_connlimit_locks[CONNLIMIT_LOCK_SLOTS] __cacheline_aligned_in_smp;
 
 struct xt_connlimit_data {
-	struct rb_root climit_root4[CONNLIMIT_SLOTS];
-	struct rb_root climit_root6[CONNLIMIT_SLOTS];
+	struct rb_root climit_root[CONNLIMIT_SLOTS];
 };
 
 static u_int32_t connlimit_rnd __read_mostly;
@@ -294,13 +293,11 @@ static int count_them(struct net *net,
 	int count;
 	u32 hash;
 
-	if (family == NFPROTO_IPV6) {
+	if (family == NFPROTO_IPV6)
 		hash = connlimit_iphash6(addr, mask);
-		root = &data->climit_root6[hash];
-	} else {
+	else
 		hash = connlimit_iphash(addr->ip & mask->ip);
-		root = &data->climit_root4[hash];
-	}
+	root = &data->climit_root[hash];
 
 	spin_lock_bh(&xt_connlimit_locks[hash % CONNLIMIT_LOCK_SLOTS]);
 
@@ -379,10 +376,8 @@ static int connlimit_mt_check(const struct xt_mtchk_param *par)
 		return -ENOMEM;
 	}
 
-	for (i = 0; i < ARRAY_SIZE(info->data->climit_root4); ++i)
-		info->data->climit_root4[i] = RB_ROOT;
-	for (i = 0; i < ARRAY_SIZE(info->data->climit_root6); ++i)
-		info->data->climit_root6[i] = RB_ROOT;
+	for (i = 0; i < ARRAY_SIZE(info->data->climit_root); ++i)
+		info->data->climit_root[i] = RB_ROOT;
 
 	return 0;
 }
@@ -413,10 +408,8 @@ static void connlimit_mt_destroy(const struct xt_mtdtor_param *par)
 
 	nf_ct_netns_put(par->net, par->family);
 
-	for (i = 0; i < ARRAY_SIZE(info->data->climit_root4); ++i)
-		destroy_tree(&info->data->climit_root4[i]);
-	for (i = 0; i < ARRAY_SIZE(info->data->climit_root6); ++i)
-		destroy_tree(&info->data->climit_root6[i]);
+	for (i = 0; i < ARRAY_SIZE(info->data->climit_root); ++i)
+		destroy_tree(&info->data->climit_root[i]);
 
 	kfree(info->data);
 }