On Tue, Oct 24, 2023 at 10:11:44PM +0200, Pablo Neira Ayuso wrote: > On Mon, Oct 16, 2023 at 07:20:06AM +0700, Bagas Sanjaya wrote: > > On Sun, Oct 15, 2023 at 09:56:14PM +0200, Vladimir Smelhaus wrote: > > > Netfilter ignores the timeout settings for a flowtable > > > > > > # sysctl -a -r flowtable > > > net.netfilter.nf_flowtable_tcp_timeout = 30 > > > net.netfilter.nf_flowtable_udp_timeout = 30 > > > > > > Situation. A long udp connection (tunnel) with some data flowing through a > > > router. The connection is sent to a flowtable on the router. It's a few > > > packets per second, more here and there, a pause here and there, and so on > > > over and over. The pauses are minimal and are also limited by the tunnel > > > settings to be no longer than 25 seconds. Everything is satisfying to make > > > the connection last continuously in the flowtable and not reappear in > > > forward. However, the connection keeps dropping out of the flowtable. It > > > stays in the flowtable (offloaded) for a second at most and then it is > > > kicked out, back to forward. > > > > > > In an attached test script you can see counters that should be zero but are not. If I watch the normal packet flow on a particular router, I can see packets in the conntrack table that should be OFFLOAD as ASSURED. > > > > > > Tested in kernel 6.5.6. In an old(er) kernel 5.10 it works as expected. > > > > > > > Then please perform bisection to find a culprit that introduces your > > regression (see Documentation/admin-guide/bug-bisect.rst in the kernel > > sources for reference). Also, it'd been great if you also post the > > reproducer script inline (within your email) instead, as some MUAs > > (like mutt that I'm using now) may ignore the attachment. > > > > Anyway, thanks for the regression report. I'm adding it to regzbot: > > > > #regzbot ^introduced: v5.10..v6.5 > > Fix here: > > https://patchwork.ozlabs.org/project/netfilter-devel/patch/20231024193815.1987-1-pablo@xxxxxxxxxxxxx/ > > it is a bug from Jun 2023, regression was introduced in the v6.5 > development cycle. > Telling regzbot: #regzbot fix: netfilter: nf_flow_table: GC pushes back packets to classic path Thanks. -- An old man doll... just what I always wanted! - Clara
Attachment:
signature.asc
Description: PGP signature
