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openvswitch: switch to per-action label counting in conntrack

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Similar to commit 70f06c115b ("sched: act_ct: switch to per-action
label counting"), we should also switch to per-action label counting
in openvswitch conntrack, as Florian suggested.

The difference is that nf_connlabels_get() is called unconditionally
when creating an ct action in ovs_ct_copy_action(). As with these
flows:

  table=0,ip,actions=ct(commit,table=1)
  table=1,ip,actions=ct(commit,exec(set_field:0xac->ct_label),table=2)

it needs to make sure the label ext is created in the 1st flow before
the ct is committed in ovs_ct_commit(). Otherwise, the warning in
nf_ct_ext_add() when creating the label ext in the 2nd flow will
be triggered:

   WARN_ON(nf_ct_is_confirmed(ct));

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Aaron Conole <aconole@redhat.com>
Acked-by: Florian Westphal <fw@strlen.de>
Link: https://patch.msgid.link/6b9347d5c1a0b364e88d900b29a616c3f8e5b1ca.1723483073.git.lucien.xin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xin Long 2024-08-12 13:17:53 -04:00 committed by Jakub Kicinski
parent e5efc2311c
commit fcb1aa5163
2 changed files with 12 additions and 21 deletions
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30
net/openvswitch/conntrack.c
View File

@ -1368,11 +1368,8 @@ bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
attr == OVS_KEY_ATTR_CT_MARK)
return true;
if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
attr == OVS_KEY_ATTR_CT_LABELS) {
struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
return ovs_net->xt_label;
}
attr == OVS_KEY_ATTR_CT_LABELS)
return true;
return false;
}
@ -1381,6 +1378,7 @@ int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
const struct sw_flow_key *key,
struct sw_flow_actions **sfa, bool log)
{
unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
struct ovs_conntrack_info ct_info;
const char *helper = NULL;
u16 family;
@ -1409,6 +1407,12 @@ int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
return -ENOMEM;
}
if (nf_connlabels_get(net, n_bits - 1)) {
nf_ct_tmpl_free(ct_info.ct);
OVS_NLERR(log, "Failed to set connlabel length");
return -EOPNOTSUPP;
}
if (ct_info.timeout[0]) {
if (nf_ct_set_timeout(net, ct_info.ct, family, key->ip.proto,
ct_info.timeout))
@ -1577,6 +1581,7 @@ static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
if (ct_info->ct) {
if (ct_info->timeout[0])
nf_ct_destroy_timeout(ct_info->ct);
nf_connlabels_put(nf_ct_net(ct_info->ct));
nf_ct_tmpl_free(ct_info->ct);
}
}
@ -2002,17 +2007,9 @@ struct genl_family dp_ct_limit_genl_family __ro_after_init = {
int ovs_ct_init(struct net *net)
{
unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
if (nf_connlabels_get(net, n_bits - 1)) {
ovs_net->xt_label = false;
OVS_NLERR(true, "Failed to set connlabel length");
} else {
ovs_net->xt_label = true;
}
#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
return ovs_ct_limit_init(net, ovs_net);
#else
return 0;
@ -2021,12 +2018,9 @@ int ovs_ct_init(struct net *net)
void ovs_ct_exit(struct net *net)
{
#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
ovs_ct_limit_exit(net, ovs_net);
#endif
if (ovs_net->xt_label)
nf_connlabels_put(net);
}

3
net/openvswitch/datapath.h
View File

@ -160,9 +160,6 @@ struct ovs_net {
#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
struct ovs_ct_limit_info *ct_limit_info;
#endif
/* Module reference for configuring conntrack. */
bool xt_label;
};
/**