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openvswitch: set IPS_CONFIRMED in tmpl status only when commit is set in conntrack

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By not setting IPS_CONFIRMED in tmpl that allows the exp not to be removed
from the hashtable when lookup, we can simplify the exp processing code a
lot in openvswitch conntrack.

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 17:09:19 -04:00 committed by Paolo Abeni
parent 76622ced50
commit 8c8b733208
1 changed files with 10 additions and 68 deletions
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78
net/openvswitch/conntrack.c
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@ -455,45 +455,6 @@ static int ovs_ct_handle_fragments(struct net *net, struct sw_flow_key *key,
return 0;
}
static struct nf_conntrack_expect *
ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone,
u16 proto, const struct sk_buff *skb)
{
struct nf_conntrack_tuple tuple;
struct nf_conntrack_expect *exp;
if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple))
return NULL;
exp = __nf_ct_expect_find(net, zone, &tuple);
if (exp) {
struct nf_conntrack_tuple_hash *h;
/* Delete existing conntrack entry, if it clashes with the
* expectation. This can happen since conntrack ALGs do not
* check for clashes between (new) expectations and existing
* conntrack entries. nf_conntrack_in() will check the
* expectations only if a conntrack entry can not be found,
* which can lead to OVS finding the expectation (here) in the
* init direction, but which will not be removed by the
* nf_conntrack_in() call, if a matching conntrack entry is
* found instead. In this case all init direction packets
* would be reported as new related packets, while reply
* direction packets would be reported as un-related
* established packets.
*/
h = nf_conntrack_find_get(net, zone, &tuple);
if (h) {
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
nf_ct_delete(ct, 0, 0);
nf_ct_put(ct);
}
}
return exp;
}
/* This replicates logic from nf_conntrack_core.c that is not exported. */
static enum ip_conntrack_info
ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
@ -852,36 +813,16 @@ static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
const struct ovs_conntrack_info *info,
struct sk_buff *skb)
{
struct nf_conntrack_expect *exp;
struct nf_conn *ct;
int err;
/* If we pass an expected packet through nf_conntrack_in() the
* expectation is typically removed, but the packet could still be
* lost in upcall processing. To prevent this from happening we
* perform an explicit expectation lookup. Expected connections are
* always new, and will be passed through conntrack only when they are
* committed, as it is OK to remove the expectation at that time.
*/
exp = ovs_ct_expect_find(net, &info->zone, info->family, skb);
if (exp) {
u8 state;
err = __ovs_ct_lookup(net, key, info, skb);
if (err)
return err;
/* NOTE: New connections are NATted and Helped only when
* committed, so we are not calling into NAT here.
*/
state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED;
__ovs_ct_update_key(key, state, &info->zone, exp->master);
} else {
struct nf_conn *ct;
int err;
err = __ovs_ct_lookup(net, key, info, skb);
if (err)
return err;
ct = (struct nf_conn *)skb_nfct(skb);
if (ct)
nf_ct_deliver_cached_events(ct);
}
ct = (struct nf_conn *)skb_nfct(skb);
if (ct)
nf_ct_deliver_cached_events(ct);
return 0;
}
@ -1460,7 +1401,8 @@ int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
if (err)
goto err_free_ct;
__set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
if (ct_info.commit)
__set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
return 0;
err_free_ct:
__ovs_ct_free_action(&ct_info);