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sched: act_ct: switch to per-action label counting

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net->ct.labels_used was meant to convey 'number of ip/nftables rules
that need the label extension allocated'.

act_ct enables this for each net namespace, which voids all attempts
to avoid ct->ext allocation when possible.

Move this increment to the control plane to request label extension
space allocation only when its needed.

Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2023-10-24 13:05:51 +02:00 committed by David S. Miller
parent 8ee2843f4d
commit 70f06c115b
2 changed files with 19 additions and 23 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
include/net/tc_act/tc_ct.h
View file

@ -22,6 +22,7 @@ struct tcf_ct_params {
struct nf_nat_range2 range;
bool ipv4_range;
bool put_labels;
u16 ct_action;

41
net/sched/act_ct.c
View file

@ -690,7 +690,6 @@ static struct tc_action_ops act_ct_ops;
struct tc_ct_action_net {
struct tc_action_net tn; /* Must be first */
bool labels;
};
/* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
@ -829,8 +828,13 @@ static void tcf_ct_params_free(struct tcf_ct_params *params)
}
if (params->ct_ft)
tcf_ct_flow_table_put(params->ct_ft);
if (params->tmpl)
if (params->tmpl) {
if (params->put_labels)
nf_connlabels_put(nf_ct_net(params->tmpl));
nf_ct_put(params->tmpl);
}
kfree(params);
}
@ -1154,9 +1158,9 @@ static int tcf_ct_fill_params(struct net *net,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct tc_ct_action_net *tn = net_generic(net, act_ct_ops.net_id);
struct nf_conntrack_zone zone;
int err, family, proto, len;
bool put_labels = false;
struct nf_conn *tmpl;
char *name;
@ -1186,15 +1190,20 @@ static int tcf_ct_fill_params(struct net *net,
}
if (tb[TCA_CT_LABELS]) {
unsigned int n_bits = sizeof_field(struct tcf_ct_params, labels) * 8;
if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) {
NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled.");
return -EOPNOTSUPP;
}
if (!tn->labels) {
if (nf_connlabels_get(net, n_bits - 1)) {
NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length");
return -EOPNOTSUPP;
} else {
put_labels = true;
}
tcf_ct_set_key_val(tb,
p->labels, TCA_CT_LABELS,
p->labels_mask, TCA_CT_LABELS_MASK,
@ -1238,10 +1247,15 @@ static int tcf_ct_fill_params(struct net *net,
}
}
p->put_labels = put_labels;
if (p->ct_action & TCA_CT_ACT_COMMIT)
__set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
return 0;
err:
if (put_labels)
nf_connlabels_put(net);
nf_ct_put(p->tmpl);
p->tmpl = NULL;
return err;
@ -1542,32 +1556,13 @@ static struct tc_action_ops act_ct_ops = {
static __net_init int ct_init_net(struct net *net)
{
unsigned int n_bits = sizeof_field(struct tcf_ct_params, labels) * 8;
struct tc_ct_action_net *tn = net_generic(net, act_ct_ops.net_id);
if (nf_connlabels_get(net, n_bits - 1)) {
tn->labels = false;
pr_err("act_ct: Failed to set connlabels length");
} else {
tn->labels = true;
}
return tc_action_net_init(net, &tn->tn, &act_ct_ops);
}
static void __net_exit ct_exit_net(struct list_head *net_list)
{
struct net *net;
rtnl_lock();
list_for_each_entry(net, net_list, exit_list) {
struct tc_ct_action_net *tn = net_generic(net, act_ct_ops.net_id);
if (tn->labels)
nf_connlabels_put(net);
}
rtnl_unlock();
tc_action_net_exit(net_list, act_ct_ops.net_id);
}