netfilter: xt_connlimit: use hlist instead

The header of hlist is smaller than list.

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/netfilter/xt_connlimit.c b/net/netfilter/xt_connlimit.c
index ade2a80..da56d6e 100644 (file)
--- a/net/netfilter/xt_connlimit.c
+++ b/net/netfilter/xt_connlimit.c
@@ -33,14 +33,14 @@
 
 /* we will save the tuples of all connections we care about */
 struct xt_connlimit_conn {
-       struct list_head                list;
+       struct hlist_node               node;
        struct nf_conntrack_tuple       tuple;
        union nf_inet_addr              addr;
 };
 
 struct xt_connlimit_data {
-       struct list_head iphash[256];
-       spinlock_t lock;
+       struct hlist_head       iphash[256];
+       spinlock_t              lock;
 };
 
 static u_int32_t connlimit_rnd __read_mostly;
@@ -102,9 +102,9 @@ static int count_them(struct net *net,
 {
        const struct nf_conntrack_tuple_hash *found;
        struct xt_connlimit_conn *conn;
-       struct xt_connlimit_conn *tmp;
+       struct hlist_node *pos, *n;
        struct nf_conn *found_ct;
-       struct list_head *hash;
+       struct hlist_head *hash;
        bool addit = true;
        int matches = 0;
 
@@ -116,7 +116,7 @@ static int count_them(struct net *net,
        rcu_read_lock();
 
        /* check the saved connections */
-       list_for_each_entry_safe(conn, tmp, hash, list) {
+       hlist_for_each_entry_safe(conn, pos, n, hash, node) {
                found    = nf_conntrack_find_get(net, NF_CT_DEFAULT_ZONE,
                                                 &conn->tuple);
                found_ct = NULL;
@@ -136,7 +136,7 @@ static int count_them(struct net *net,
 
                if (found == NULL) {
                        /* this one is gone */
-                       list_del(&conn->list);
+                       hlist_del(&conn->node);
                        kfree(conn);
                        continue;
                }
@@ -147,7 +147,7 @@ static int count_them(struct net *net,
                         * closed already -> ditch it
                         */
                        nf_ct_put(found_ct);
-                       list_del(&conn->list);
+                       hlist_del(&conn->node);
                        kfree(conn);
                        continue;
                }
@@ -167,7 +167,7 @@ static int count_them(struct net *net,
                        return -ENOMEM;
                conn->tuple = *tuple;
                conn->addr = *addr;
-               list_add(&conn->list, hash);
+               hlist_add_head(&conn->node, hash);
                ++matches;
        }
 
@@ -246,7 +246,7 @@ static int connlimit_mt_check(const struct xt_mtchk_param *par)
 
        spin_lock_init(&info->data->lock);
        for (i = 0; i < ARRAY_SIZE(info->data->iphash); ++i)
-               INIT_LIST_HEAD(&info->data->iphash[i]);
+               INIT_HLIST_HEAD(&info->data->iphash[i]);
 
        return 0;
 }
@@ -255,15 +255,15 @@ static void connlimit_mt_destroy(const struct xt_mtdtor_param *par)
 {
        const struct xt_connlimit_info *info = par->matchinfo;
        struct xt_connlimit_conn *conn;
-       struct xt_connlimit_conn *tmp;
-       struct list_head *hash = info->data->iphash;
+       struct hlist_node *pos, *n;
+       struct hlist_head *hash = info->data->iphash;
        unsigned int i;
 
        nf_ct_l3proto_module_put(par->family);
 
        for (i = 0; i < ARRAY_SIZE(info->data->iphash); ++i) {
-               list_for_each_entry_safe(conn, tmp, &hash[i], list) {
-                       list_del(&conn->list);
+               hlist_for_each_entry_safe(conn, pos, n, &hash[i], node) {
+                       hlist_del(&conn->node);
                        kfree(conn);
                }
        }