netdev - Re: [PATCH] filter: introduce SKF_AD_VLAN

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Message-ID: <20150305085217.GD2033@nanopsycho.orion>
Date:	Thu, 5 Mar 2015 09:52:17 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Michal Sekletar <msekleta@...hat.com>
Cc:	netdev@...r.kernel.org, Alexei Starovoitov <ast@...mgrid.com>,
	Jiri Pirko <jpirko@...hat.com>
Subject: Re: [PATCH] filter: introduce SKF_AD_VLAN_PROTO BPF extension

Wed, Mar 04, 2015 at 09:41:58PM CET, msekleta@...hat.com wrote:
>This commit introduces new BPF extension. It makes possible to load value of
>skb->vlan_proto (vlan tpid) to register A.
>
>Currently, vlan header is removed from frame and information is available to
>userspace only via tpacket interface. Hence, it is not possible to install
>filter which uses value of vlan tpid field.
>
>AFAICT only way how to filter based on tpid value is to reconstruct original
>frame encapsulation and interpret BPF filter code in userspace. Doing that is
>way slower than doing filtering in kernel.
>
>Cc: Alexei Starovoitov <ast@...mgrid.com>
>Cc: Jiri Pirko <jpirko@...hat.com>
>Signed-off-by: Michal Sekletar <msekleta@...hat.com>

Reviewed-by: Jiri Pirko <jiri@...nulli.us>
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