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netfilter: allow exp not to be removed in nf_ct_find_expectation 

Currently nf_conntrack_in() calling nf_ct_find_expectation() will
remove the exp from the hash table. However, in some scenario, we
expect the exp not to be removed when the created ct will not be
confirmed, like in OVS and TC conntrack in the following patches.

This patch allows exp not to be removed by setting IPS_CONFIRMED
in the status of the tmpl.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Aaron Conole <aconole@redhat.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Xin Long 2023-07-16 17:09:17 -04:00 committed by Paolo Abeni
parent 03b123debc
commit 4914109a8e
4 changed files with 6 additions and 4 deletions
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2
include/net/netfilter/nf_conntrack_expect.h
View File

@ -100,7 +100,7 @@ nf_ct_expect_find_get(struct net *net,
struct nf_conntrack_expect *
nf_ct_find_expectation(struct net *net,
const struct nf_conntrack_zone *zone,
const struct nf_conntrack_tuple *tuple);
const struct nf_conntrack_tuple *tuple, bool unlink);
void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
u32 portid, int report);

2
net/netfilter/nf_conntrack_core.c
View File

@ -1756,7 +1756,7 @@ init_conntrack(struct net *net, struct nf_conn *tmpl,
cnet = nf_ct_pernet(net);
if (cnet->expect_count) {
spin_lock_bh(&nf_conntrack_expect_lock);
exp = nf_ct_find_expectation(net, zone, tuple);
exp = nf_ct_find_expectation(net, zone, tuple, !tmpl || nf_ct_is_confirmed(tmpl));
if (exp) {
/* Welcome, Mr. Bond. We've been expecting you... */
__set_bit(IPS_EXPECTED_BIT, &ct->status);

4
net/netfilter/nf_conntrack_expect.c
View File

@ -171,7 +171,7 @@ EXPORT_SYMBOL_GPL(nf_ct_expect_find_get);
struct nf_conntrack_expect *
nf_ct_find_expectation(struct net *net,
const struct nf_conntrack_zone *zone,
const struct nf_conntrack_tuple *tuple)
const struct nf_conntrack_tuple *tuple, bool unlink)
{
struct nf_conntrack_net *cnet = nf_ct_pernet(net);
struct nf_conntrack_expect *i, *exp = NULL;
@ -211,7 +211,7 @@ nf_ct_find_expectation(struct net *net,
!refcount_inc_not_zero(&exp->master->ct_general.use)))
return NULL;
if (exp->flags & NF_CT_EXPECT_PERMANENT) {
if (exp->flags & NF_CT_EXPECT_PERMANENT || !unlink) {
refcount_inc(&exp->use);
return exp;
} else if (del_timer(&exp->timeout)) {

2
net/netfilter/nft_ct.c
View File

@ -262,6 +262,7 @@ static void nft_ct_set_zone_eval(const struct nft_expr *expr,
regs->verdict.code = NF_DROP;
return;
}
__set_bit(IPS_CONFIRMED_BIT, &ct->status);
}
nf_ct_set(skb, ct, IP_CT_NEW);
@ -368,6 +369,7 @@ static bool nft_ct_tmpl_alloc_pcpu(void)
return false;
}
__set_bit(IPS_CONFIRMED_BIT, &tmp->status);
per_cpu(nft_ct_pcpu_template, cpu) = tmp;
}