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From: Jamal Hadi Salim <jhs@mojatatu.com>
To: Cong Wang <xiyou.wangcong@gmail.com>, netdev@vger.kernel.org
Cc: Martin Olsson <martin.olsson+netdev@sentorsecurity.com>,
	Jiri Pirko <jiri@resnulli.us>
Subject: Re: [Patch net] net_sched: refetch skb protocol for each filter
Date: Wed, 16 Jan 2019 08:59:08 -0500	[thread overview]
Message-ID: <7d4c774c-c17d-1739-81f3-bdab67099138@mojatatu.com> (raw)
In-Reply-To: <20190112025542.397-1-xiyou.wangcong@gmail.com>

On 2019-01-11 9:55 p.m., Cong Wang wrote:
> Martin reported a set of filters don't work after changing
> from reclassify to continue. Looking into the code, it
> looks like skb protocol is not always fetched for each
> iteration of the filters. But, as demonstrated by Martin,
> TC actions could modify skb->protocol, for example act_vlan,
> this means we have to refetch skb protocol in each iteration,
> rather than using the one we fetch in the beginning of the loop.
> 
> This bug is _not_ introduced by commit 3b3ae880266d
> ("net: sched: consolidate tc_classify{,_compat}"), technically,
> if act_vlan is the only action that modifies skb protocol, then
> it is commit c7e2b9689ef8 ("sched: introduce vlan action") which
> introduced this bug.
> 
> Reported-by: Martin Olsson <martin.olsson+netdev@sentorsecurity.com>
> Cc: Jamal Hadi Salim <jhs@mojatatu.com>
> Cc: Jiri Pirko <jiri@resnulli.us>
> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>

Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>

cheers,
jamal

      parent reply	other threads:[~2019-01-16 13:59 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-12  2:55 [Patch net] net_sched: refetch skb protocol for each filter Cong Wang
2019-01-12 12:23 ` Jamal Hadi Salim
2019-01-12 15:41   ` Jamal Hadi Salim
2019-01-13 21:08     ` Cong Wang
2019-01-15 15:59       ` Jamal Hadi Salim
2019-01-15 16:21         ` Jamal Hadi Salim
2019-01-15 17:57           ` Cong Wang
2019-01-16 14:02             ` Jamal Hadi Salim
2019-01-15 17:52         ` Cong Wang
2019-01-13 20:58   ` Cong Wang
2019-01-15 15:14     ` Jamal Hadi Salim
2019-01-14  9:15   ` Martin Olsson
2019-01-15 15:19     ` Jamal Hadi Salim
2019-01-14 23:13   ` Lucas Bates
2019-01-14  9:23 ` Daniel Borkmann
2019-01-14 19:55   ` Cong Wang
2019-01-16 13:59 ` Jamal Hadi Salim [this message]

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