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Date: Wed, 22 Apr 2020 12:32:59 -0700 (PDT) From: David Miller <davem@...emloft.net> To: dsahern@...nel.org Cc: netdev@...r.kernel.org, kuba@...nel.org, trev@...ock.ca, dsahern@...il.com Subject: Re: [PATCH net 0/2] net: Fix looping with vrf, xfrms and qdisc on VRF From: David Ahern <dsahern@...nel.org> Date: Mon, 20 Apr 2020 17:13:50 -0600 > 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. Series applied and queued up for -stable, thanks David.
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