netdev - [PATCH net 0/2] Fix vlan untag and insertion for bridge and vlan with reorder

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Date:   Tue, 13 Mar 2018 14:51:26 +0900
From:   Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
        netdev@...r.kernel.org,
        Brandon Carpenter <brandon.carpenter@...herpath.com>,
        Vlad Yasevich <vyasevic@...hat.com>
Subject: [PATCH net 0/2] Fix vlan untag and insertion for bridge and vlan with reorder_hdr off

As Brandon Carpenter reported[1], sending non-vlan-offloaded packets from
bridge devices ends up with corrupted packets. He narrowed down this problem
and found that the root cause is in skb_reorder_vlan_header().

While I was working on fixing this problem, I found that the function does
not work properly for double tagged packets with reorder_hdr off as well.

Patch 1 fixes these 2 problems in skb_reorder_vlan_header().

And it turned out that fixing skb_reorder_vlan_header() is not sufficient
to receive double tagged packets with reorder_hdr off while I was testing the
fix. Vlan tags got out of order when vlan devices with reorder_hdr disabled
were stacked. Patch 2 fixes this problem.

[1] https://www.spinics.net/lists/linux-ethernet-bridging/msg07039.html

Toshiaki Makita (2):
  net: Fix vlan untag for bridge and vlan_dev with reorder_hdr off
  vlan: Fix out of order vlan headers with reorder header off

 include/linux/if_vlan.h       | 66 +++++++++++++++++++++++++++++++++++--------
 include/uapi/linux/if_ether.h |  1 +
 net/8021q/vlan_core.c         |  4 +--
 net/core/skbuff.c             |  7 +++--
 4 files changed, 63 insertions(+), 15 deletions(-)

-- 
1.8.3.1