[PATCH 5.10 31/67] netfilter: conntrack: adjust stop timestamp to real expiry value

Greg Kroah-Hartman
2021-08-02T14:02:19Z

From: Florian Westphal <fw@strlen.de>

[ 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>
---
net/netfilter/nf_conntrack_core.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index ff0168736f6e..f9f2af26ccb3 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -661,8 +661,13 @@ 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) {
--
2.30.2