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Message-Id: <20200420231352.50855-1-dsahern@kernel.org>
Date: Mon, 20 Apr 2020 17:13:50 -0600
From: David Ahern <dsahern@...nel.org>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, trev@...ock.ca,
David Ahern <dsahern@...il.com>
Subject: [PATCH net 0/2] net: Fix looping with vrf, xfrms and qdisc on VRF
From: David Ahern <dsahern@...il.com>
Trev reported that use of VRFs with xfrms is looping when a qdisc
is added to the VRF device. The combination of xfrm + qdisc is not
handled by the VRF driver which lost track that it has already
seen the packet.
The XFRM_TRANSFORMED flag is used by the netfilter code for a similar
purpose, so re-use for VRF. Patch 1 drops the #ifdef around setting
the flag in the xfrm output functions. Patch 2 adds a check to
the VRF driver for flag; if set the packet has already passed through
the VRF driver once and does not need to recirculated a second time.
This is a day 1 bug with VRFs; stable wise, I would only take this
back to 4.14. I have a set of test cases which I will submit to
net-next.
David Ahern (2):
xfrm: Always set XFRM_TRANSFORMED in xfrm{4,6}_output_finish
vrf: Check skb for XFRM_TRANSFORMED flag
drivers/net/vrf.c | 6 ++++--
net/ipv4/xfrm4_output.c | 2 --
net/ipv6/xfrm6_output.c | 2 --
3 files changed, 4 insertions(+), 6 deletions(-)
--
2.20.1
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