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netfilter: conntrack: use a single nat bysource table for all namespaces 

We already include netns address in the hash, so we only need to use
net_eq in find_appropriate_src and can then put all entries into
same table.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2016-05-09 16:24:31 +02:00 committed by Pablo Neira Ayuso
parent 464c38556e
commit a76ae1c855
2 changed files with 17 additions and 20 deletions
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4
include/net/netns/conntrack.h
View File

@ -103,9 +103,5 @@ struct netns_ct {
unsigned int labels_used;
u8 label_words;
#endif
#ifdef CONFIG_NF_NAT_NEEDED
struct hlist_head *nat_bysource;
unsigned int nat_htable_size;
#endif
};
#endif

33
net/netfilter/nf_nat_core.c
View File

@ -37,6 +37,9 @@ static const struct nf_nat_l3proto __rcu *nf_nat_l3protos[NFPROTO_NUMPROTO]
__read_mostly;
static const struct nf_nat_l4proto __rcu **nf_nat_l4protos[NFPROTO_NUMPROTO]
__read_mostly;
static struct hlist_head *nf_nat_bysource __read_mostly;
static unsigned int nf_nat_htable_size __read_mostly;
static unsigned int nf_nat_hash_rnd __read_mostly;
inline const struct nf_nat_l3proto *
@ -128,7 +131,7 @@ hash_by_src(const struct net *n, const struct nf_conntrack_tuple *tuple)
hash = jhash2((u32 *)&tuple->src, sizeof(tuple->src) / sizeof(u32),
tuple->dst.protonum ^ nf_nat_hash_rnd ^ net_hash_mix(n));
return reciprocal_scale(hash, n->ct.nat_htable_size);
return reciprocal_scale(hash, nf_nat_htable_size);
}
/* Is this tuple already taken? (not by us) */
@ -198,9 +201,10 @@ find_appropriate_src(struct net *net,
const struct nf_conn_nat *nat;
const struct nf_conn *ct;
hlist_for_each_entry_rcu(nat, &net->ct.nat_bysource[h], bysource) {
hlist_for_each_entry_rcu(nat, &nf_nat_bysource[h], bysource) {
ct = nat->ct;
if (same_src(ct, tuple) &&
net_eq(net, nf_ct_net(ct)) &&
nf_ct_zone_equal(ct, zone, IP_CT_DIR_ORIGINAL)) {
/* Copy source part from reply tuple. */
nf_ct_invert_tuplepr(result,
@ -433,7 +437,7 @@ nf_nat_setup_info(struct nf_conn *ct,
nat = nfct_nat(ct);
nat->ct = ct;
hlist_add_head_rcu(&nat->bysource,
&net->ct.nat_bysource[srchash]);
&nf_nat_bysource[srchash]);
spin_unlock_bh(&nf_nat_lock);
}
@ -821,27 +825,14 @@ nfnetlink_parse_nat_setup(struct nf_conn *ct,
}
#endif
static int __net_init nf_nat_net_init(struct net *net)
{
/* Leave them the same for the moment. */
net->ct.nat_htable_size = nf_conntrack_htable_size;
net->ct.nat_bysource = nf_ct_alloc_hashtable(&net->ct.nat_htable_size, 0);
if (!net->ct.nat_bysource)
return -ENOMEM;
return 0;
}
static void __net_exit nf_nat_net_exit(struct net *net)
{
struct nf_nat_proto_clean clean = {};
nf_ct_iterate_cleanup(net, nf_nat_proto_clean, &clean, 0, 0);
synchronize_rcu();
nf_ct_free_hashtable(net->ct.nat_bysource, net->ct.nat_htable_size);
}
static struct pernet_operations nf_nat_net_ops = {
.init = nf_nat_net_init,
.exit = nf_nat_net_exit,
};
@ -854,8 +845,16 @@ static int __init nf_nat_init(void)
{
int ret;
/* Leave them the same for the moment. */
nf_nat_htable_size = nf_conntrack_htable_size;
nf_nat_bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size, 0);
if (!nf_nat_bysource)
return -ENOMEM;
ret = nf_ct_extend_register(&nat_extend);
if (ret < 0) {
nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size);
printk(KERN_ERR "nf_nat_core: Unable to register extension\n");
return ret;
}
@ -879,6 +878,7 @@ static int __init nf_nat_init(void)
return 0;
cleanup_extend:
nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size);
nf_ct_extend_unregister(&nat_extend);
return ret;
}
@ -897,6 +897,7 @@ static void __exit nf_nat_cleanup(void)
for (i = 0; i < NFPROTO_NUMPROTO; i++)
kfree(nf_nat_l4protos[i]);
synchronize_net();
nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size);
}
MODULE_LICENSE("GPL");