netdev - Re: [PATCH net] ipv6: tcp: add a missing nf_reset

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Date: Sat, 23 Sep 2023 01:53:51 +0200
From: Florian Westphal <fw@...len.de>
To: Ilya Maximets <i.maximets@....org>
Cc: netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...nel.org>,
	Florian Westphal <fw@...len.de>,
	Madhu Koriginja <madhu.koriginja@....com>,
	Frode Nordahl <frode.nordahl@...onical.com>,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [PATCH net] ipv6: tcp: add a missing nf_reset_ct() in 3WHS
 handling

Ilya Maximets <i.maximets@....org> wrote:
> Commit b0e214d21203 ("netfilter: keep conntrack reference until
> IPsecv6 policy checks are done") is a direct copy of the old
> commit b59c270104f0 ("[NETFILTER]: Keep conntrack reference until
> IPsec policy checks are done") but for IPv6.  However, it also
> copies a bug that this old commit had.  That is: when the third
> packet of 3WHS connection establishment contains payload, it is
> added into socket receive queue without the XFRM check and the
> drop of connection tracking context.
> 
> That leads to nf_conntrack module being impossible to unload as
> it waits for all the conntrack references to be dropped while
> the packet release is deferred in per-cpu cache indefinitely, if
> not consumed by the application.
> 
> The issue for IPv4 was fixed in commit 6f0012e35160 ("tcp: add a
> missing nf_reset_ct() in 3WHS handling") by adding a missing XFRM
> check and correctly dropping the conntrack context.  However, the
> issue was introduced to IPv6 code afterwards.  Fixing it the
> same way for IPv6 now.
> 
> Fixes: b0e214d21203 ("netfilter: keep conntrack reference until IPsecv6 policy checks are done")
> Link: https://lore.kernel.org/netdev/d589a999-d4dd-2768-b2d5-89dec64a4a42@ovn.org/
> Signed-off-by: Ilya Maximets <i.maximets@....org>
> ---
>  net/ipv6/tcp_ipv6.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 

LGTM, thanks for tracking this down.

Acked-by: Florian Westphal <fw@...len.de>