netdev - Re: [PATCH net 1/2] net: dev_queue_xmit_nit: fix skb->vlan

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Date:	Tue, 8 Jan 2013 22:06:45 -0800
From:	Ani Sinha <ani@...stanetworks.com>
To:	Paul Pearce <pearce@...berkeley.edu>
Cc:	netdev@...r.kernel.org, dborkman <dborkman@...hat.com>,
	edumazet <edumazet@...gle.com>, Jiri Pirko <jpirko@...hat.com>
Subject: Re: [PATCH net 1/2] net: dev_queue_xmit_nit: fix skb->vlan_tci field value

On Tue, Jan 8, 2013 at 9:15 PM, Paul Pearce <pearce@...berkeley.edu> wrote:
> On Tue, 2013-01-08 at 19:51 +0100, Daniel Borkmann wrote:
>> VLAN packets that are locally injected through taps will loose their
>> skb->vlan_tci value when they pass dev_hard_start_xmit and get looped
>> back to a packet sniffer via dev_queue_xmit_nit. Besides others, this
>> meta data is used in Linux socket filtering for VLANs. Tested with a
>> VLAN ancillary ops filter.
>>
>> Patch is based on a previous version by Jiri Pirko.
>
> I think there may be issues with the patch beyond Eric's comments. It
> seems to trash packet contents.
>
> I applied this patch to Fedora flavored kernel 3.6.11-1.fc16.x86_64.
> vlan tagged packets injected via libpcap's pcap_inject() came out
> mangled at the packet filters.
>

The proposed patch tries to fix the issue that arose after the
following commit :

commit b40863c667c16b7a73d4f034a8eab67029b5b15a
Author: Eric Dumazet <edumazet@...gle.com>
Date:   Tue Sep 18 20:44:49 2012 +0000

    net: more accurate network taps in transmit path


I do not believe 3.6.11 kernel has this change. 3.6.11 should not need
the patch.

ani
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