netdev - Re: [PATCH ipsec,v2] xfrm: fix "disable

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Date:   Mon, 10 Oct 2022 15:52:59 +0300
From:   Eyal Birger <eyal.birger@...il.com>
To:     nicolas.dichtel@...nd.com
Cc:     steffen.klassert@...unet.com, davem@...emloft.net,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        monil191989@...il.com, stephen@...workplumber.org
Subject: Re: [PATCH ipsec,v2] xfrm: fix "disable_policy" on ipv4 early demux

On Mon, Oct 10, 2022 at 3:19 PM Nicolas Dichtel
<nicolas.dichtel@...nd.com> wrote:
>
> Le 10/10/2022 à 12:29, Eyal Birger a écrit :
> > Hi Nicolas,
> >
> > On Mon, Oct 10, 2022 at 11:28 AM Nicolas Dichtel
> > <nicolas.dichtel@...nd.com> wrote:
> >>
> >> Le 09/10/2022 à 21:16, Eyal Birger a écrit :
> >>> The commit in the "Fixes" tag tried to avoid a case where policy check
> >>> is ignored due to dst caching in next hops.
> >>>
> >>> However, when the traffic is locally consumed, the dst may be cached
> >>> in a local TCP or UDP socket as part of early demux. In this case the
> >>> "disable_policy" flag is not checked as ip_route_input_noref() was only
> >>> called before caching, and thus, packets after the initial packet in a
> >>> flow will be dropped if not matching policies.
> >>>
> >>> Fix by checking the "disable_policy" flag also when a valid dst is
> >>> already available.
> >>>
> >>> Link: https://bugzilla.kernel.org/show_bug.cgi?id=216557
> >>> Reported-by: Monil Patel <monil191989@...il.com>
> >>> Fixes: e6175a2ed1f1 ("xfrm: fix "disable_policy" flag use when arriving from different devices")
> >>> Signed-off-by: Eyal Birger <eyal.birger@...il.com>
> >>>
> >>
> >> Is there the same problem with ipv6?
> >
> > The issue is specific to IPv4 as the original fix was only relevant
> > to IPv4.
> >
> > I also tested a similar scenario using IPv6 addresses and did not see
> > a problem.
> Thanks. Is it possible to write a selftest with this scenario?

I can add one targeting ipsec-next.

Do you perhaps know which is the current preferred flavor for such selftests
for ipsec - C or bash?

Eyal.