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Commit 8073e960 authored by Florian Westphal's avatar Florian Westphal Committed by Pablo Neira Ayuso
Browse files

netfilter: nat: use keyed locks 



no need to serialize on a single lock, we can partition the table and
add/delete in parallel to different slots.
This restores one of the advantages that got lost with the rhlist
revert.

Cc: Ivan Babrou <ibobrik@gmail.com>
Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent e1bf1687

net/netfilter/nf_nat_core.c

+24 −12
Original line number Diff line number Diff line
@@ -30,7 +30,7 @@ 
#include <net/netfilter/nf_conntrack_zones.h>

#include <linux/netfilter/nf_nat.h>



static DEFINE_SPINLOCK(nf_nat_lock);

static spinlock_t nf_nat_locks[CONNTRACK_LOCKS];



static DEFINE_MUTEX(nf_nat_proto_mutex);

static const struct nf_nat_l3proto __rcu *nf_nat_l3protos[NFPROTO_NUMPROTO]
@@ -425,13 +425,15 @@ nf_nat_setup_info(struct nf_conn *ct, 


	if (maniptype == NF_NAT_MANIP_SRC) {

		unsigned int srchash;

		spinlock_t *lock;



		srchash = hash_by_src(net,

				      &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);

		spin_lock_bh(&nf_nat_lock);

		lock = &nf_nat_locks[srchash % ARRAY_SIZE(nf_nat_locks)];

		spin_lock_bh(lock);

		hlist_add_head_rcu(&ct->nat_bysource,

				   &nf_nat_bysource[srchash]);

		spin_unlock_bh(&nf_nat_lock);

		spin_unlock_bh(lock);

	}



	/* It's done. */
@@ -525,6 +527,16 @@ static int nf_nat_proto_remove(struct nf_conn *i, void *data) 
	return i->status & IPS_NAT_MASK ? 1 : 0;

}



static void __nf_nat_cleanup_conntrack(struct nf_conn *ct)

{

	unsigned int h;



	h = hash_by_src(nf_ct_net(ct), &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);

	spin_lock_bh(&nf_nat_locks[h % ARRAY_SIZE(nf_nat_locks)]);

	hlist_del_rcu(&ct->nat_bysource);

	spin_unlock_bh(&nf_nat_locks[h % ARRAY_SIZE(nf_nat_locks)]);

}



static int nf_nat_proto_clean(struct nf_conn *ct, void *data)

{

	if (nf_nat_proto_remove(ct, data))
@@ -540,9 +552,7 @@ static int nf_nat_proto_clean(struct nf_conn *ct, void *data) 
	 * will delete entry from already-freed table.

	 */

	clear_bit(IPS_SRC_NAT_DONE_BIT, &ct->status);

	spin_lock_bh(&nf_nat_lock);

	hlist_del_rcu(&ct->nat_bysource);

	spin_unlock_bh(&nf_nat_lock);

	__nf_nat_cleanup_conntrack(ct);



	/* don't delete conntrack.  Although that would make things a lot

	 * simpler, we'd end up flushing all conntracks on nat rmmod.
@@ -670,11 +680,8 @@ EXPORT_SYMBOL_GPL(nf_nat_l3proto_unregister); 
/* No one using conntrack by the time this called. */

static void nf_nat_cleanup_conntrack(struct nf_conn *ct)

{

	if (ct->status & IPS_SRC_NAT_DONE) {

		spin_lock_bh(&nf_nat_lock);

		hlist_del_rcu(&ct->nat_bysource);

		spin_unlock_bh(&nf_nat_lock);

	}

	if (ct->status & IPS_SRC_NAT_DONE)

		__nf_nat_cleanup_conntrack(ct);

}



static struct nf_ct_ext_type nat_extend __read_mostly = {
@@ -796,10 +803,12 @@ static struct nf_ct_helper_expectfn follow_master_nat = { 


static int __init nf_nat_init(void)

{

	int ret;

	int ret, i;



	/* Leave them the same for the moment. */

	nf_nat_htable_size = nf_conntrack_htable_size;

	if (nf_nat_htable_size < ARRAY_SIZE(nf_nat_locks))

		nf_nat_htable_size = ARRAY_SIZE(nf_nat_locks);



	nf_nat_bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size, 0);

	if (!nf_nat_bysource)
@@ -812,6 +821,9 @@ static int __init nf_nat_init(void) 
		return ret;

	}



	for (i = 0; i < ARRAY_SIZE(nf_nat_locks); i++)

		spin_lock_init(&nf_nat_locks[i]);



	nf_ct_helper_expectfn_register(&follow_master_nat);



	BUG_ON(nfnetlink_parse_nat_setup_hook != NULL);