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netfilter: conntrack: adjust stop timestamp to real expiry value

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[ Upstream commit 30a56a2b881821625f79837d4d968c679852444e ]

In case the entry is evicted via garbage collection there is
delay between the timeout value and the eviction event.

This adjusts the stop value based on how much time has passed.

Fixes: b87a2f9199ea82 ("netfilter: conntrack: add gc worker to remove timed-out entries")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Florian Westphal 2021-07-18 18:36:00 +02:00 committed by Greg Kroah-Hartman
parent f6ba582293
commit 789a3a3c94
1 changed files with 6 additions and 1 deletions
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7
net/netfilter/nf_conntrack_core.c
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@ -491,8 +491,13 @@ bool nf_ct_delete(struct nf_conn *ct, u32 portid, int report)
return false;
tstamp = nf_conn_tstamp_find(ct);
if (tstamp && tstamp->stop == 0)
if (tstamp) {
s32 timeout = ct->timeout - nfct_time_stamp;
tstamp->stop = ktime_get_real_ns();
if (timeout < 0)
tstamp->stop -= jiffies_to_nsecs(-timeout);
}
if (nf_conntrack_event_report(IPCT_DESTROY, ct,
portid, report) < 0) {