netdev - Re: [PATCH net] openvswitch: Fix cached ct with helper.

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Message-ID: <CAPWQB7H9CxqgwE_K6_7-PgeoeV2FR=0T8=JXEhVbkpR-WKTk4g@mail.gmail.com>
Date:	Tue, 10 May 2016 17:31:30 -0700
From:	Joe Stringer <joe@....org>
To:	Jarno Rajahalme <jarno@....org>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] openvswitch: Fix cached ct with helper.

On 10 May 2016 at 16:55, Jarno Rajahalme <jarno@....org> wrote:
> This would result in inconsistent helper assignment if a first CT action assigns a helper and a further CT action tries to assign a different helper; Typically the second helper assignment would be ignored, but if the unconfirmed conntrack entry is lost due to an upcall the second helper assignment would be successful.  This is best resolved by allowing helper assignment by a committing CT action only by testing the 'info->commit' flag in addition to the conditions you have there already. It may also be helpful to fail helper assignment without the commit flag in parse_ct().

Strictly speaking I think that skb_nfct_cached() handles at least some
of those cases but I agree it should be more explicit here. I'll send
a v2. We can follow up separately on net-next to improve the
parsing/make that more user-friendly.