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act_ct: prepare for stolen verdict coming from conntrack and nat engine

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At this time, conntrack either returns NF_ACCEPT or NF_DROP.
To improve debuging it would be nice to be able to replace NF_DROP verdict
with NF_DROP_REASON() helper,

This helper releases the skb instantly (so drop_monitor can pinpoint
exact location) and returns NF_STOLEN.

Prepare call sites to deal with this before introducing such changes
in conntrack and nat core.

Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2024-07-04 13:29:20 +02:00 committed by David S. Miller
parent 2f5e639571
commit 3abbd7ed8b
1 changed files with 25 additions and 6 deletions
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31
net/sched/act_ct.c
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@ -944,6 +944,8 @@ static int tcf_ct_act_nat(struct sk_buff *skb,
action |= BIT(NF_NAT_MANIP_DST);
err = nf_ct_nat(skb, ct, ctinfo, &action, range, commit);
if (err != NF_ACCEPT)
return err & NF_VERDICT_MASK;
if (action & BIT(NF_NAT_MANIP_SRC))
tc_skb_cb(skb)->post_ct_snat = 1;
@ -1035,7 +1037,7 @@ TC_INDIRECT_SCOPE int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
state.pf = family;
err = nf_conntrack_in(skb, &state);
if (err != NF_ACCEPT)
goto out_push;
goto nf_error;
}
do_nat:
@ -1047,7 +1049,7 @@ do_nat:
err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit);
if (err != NF_ACCEPT)
goto drop;
goto nf_error;
if (!nf_ct_is_confirmed(ct) && commit && p->helper && !nfct_help(ct)) {
err = __nf_ct_try_assign_helper(ct, p->tmpl, GFP_ATOMIC);
@ -1061,8 +1063,9 @@ do_nat:
}
if (nf_ct_is_confirmed(ct) ? ((!cached && !skip_add) || add_helper) : commit) {
if (nf_ct_helper(skb, ct, ctinfo, family) != NF_ACCEPT)
goto drop;
err = nf_ct_helper(skb, ct, ctinfo, family);
if (err != NF_ACCEPT)
goto nf_error;
}
if (commit) {
@ -1075,8 +1078,9 @@ do_nat:
/* This will take care of sending queued events
* even if the connection is already confirmed.
*/
if (nf_conntrack_confirm(skb) != NF_ACCEPT)
goto drop;
err = nf_conntrack_confirm(skb);
if (err != NF_ACCEPT)
goto nf_error;
}
if (!skip_add)
@ -1100,6 +1104,21 @@ out_frag:
drop:
tcf_action_inc_drop_qstats(&c->common);
return TC_ACT_SHOT;
nf_error:
/* some verdicts store extra data in upper bits, such
* as errno or queue number.
*/
switch (err & NF_VERDICT_MASK) {
case NF_DROP:
goto drop;
case NF_STOLEN:
tcf_action_inc_drop_qstats(&c->common);
return TC_ACT_CONSUMED;
default:
DEBUG_NET_WARN_ON_ONCE(1);
goto drop;
}
}
static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {