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netfilter: nat: avoid use of nf_conn_nat extension 

successful insert into the bysource hash sets IPS_SRC_NAT_DONE status bit
so we can check that instead of presence of nat extension which requires
extra deref.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
hifive-unleashed-5.1
Florian Westphal 2017-03-28 10:31:03 +02:00 committed by Pablo Neira Ayuso
parent cba81cc4c9
commit 6e699867f8
2 changed files with 5 additions and 15 deletions
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2
net/netfilter/nf_conntrack_core.c
View File

@ -706,7 +706,7 @@ static int nf_ct_resolve_clash(struct net *net, struct sk_buff *skb,
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
if (l4proto->allow_clash &&
!nfct_nat(ct) &&
((ct->status & IPS_NAT_DONE_MASK) == 0) &&
!nf_ct_is_dying(ct) &&
atomic_inc_not_zero(&ct->ct_general.use)) {
enum ip_conntrack_info oldinfo;

18
net/netfilter/nf_nat_core.c
View File

@ -549,10 +549,6 @@ struct nf_nat_proto_clean {
static int nf_nat_proto_remove(struct nf_conn *i, void *data)
{
const struct nf_nat_proto_clean *clean = data;
struct nf_conn_nat *nat = nfct_nat(i);
if (!nat)
return 0;
if ((clean->l3proto && nf_ct_l3num(i) != clean->l3proto) ||
(clean->l4proto && nf_ct_protonum(i) != clean->l4proto))
@ -563,12 +559,10 @@ static int nf_nat_proto_remove(struct nf_conn *i, void *data)
static int nf_nat_proto_clean(struct nf_conn *ct, void *data)
{
struct nf_conn_nat *nat = nfct_nat(ct);
if (nf_nat_proto_remove(ct, data))
return 1;
if (!nat)
if ((ct->status & IPS_SRC_NAT_DONE) == 0)
return 0;
/* This netns is being destroyed, and conntrack has nat null binding.
@ -716,13 +710,9 @@ 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)
{
struct nf_conn_nat *nat = nf_ct_ext_find(ct, NF_CT_EXT_NAT);
if (!nat)
return;
rhltable_remove(&nf_nat_bysource_table, &ct->nat_bysource,
nf_nat_bysource_params);
if (ct->status & IPS_SRC_NAT_DONE)
rhltable_remove(&nf_nat_bysource_table, &ct->nat_bysource,
nf_nat_bysource_params);
}
static struct nf_ct_ext_type nat_extend __read_mostly = {