netdev - [PATCH/RFC net-next 0/4] net/sched: cls_flower: avoid false matching of truncated packets

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Message-Id: <20170428120035.15984-1-simon.horman@netronome.com>
Date:   Fri, 28 Apr 2017 14:00:31 +0200
From:   Simon Horman <simon.horman@...ronome.com>
To:     Jiri Pirko <jiri@...lanox.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     Dinan Gunawardena <dinan.gunawardena@...ronome.com>,
        netdev@...r.kernel.org, oss-drivers@...ronome.com
Subject: [PATCH/RFC net-next 0/4] net/sched: cls_flower: avoid false matching of truncated packets

Hi,

this series is intended to avoid false-positives which match
truncated packets against flower classifiers which match on:
* zero L4 ports or;
* zero ICMP code or type

This requires updating the flow dissector to return an error in such cases
and updating flower to not match on the result of a failed dissection.

In the case of UDP this results in a behavioural change to users of
flow_keys_dissector_keys[] and flow_keys_dissector_symmetric_keys[] -
dissection will fail on truncated packets where the IP protocol of the
packets indicates ports should be present (according to skb_flow_get_ports()).

The last patch of the series builds on the above to allow users to specify
a policy for how to handle packets whose dissection fails.

I will separately provide RFC patches to iproute2 to allow exercising the
last patch.

Simon Horman (4):
  flow dissector: return error on port dissection under-run
  flow dissector: return error on icmp dissection under-run
  net/sched: cls_flower: do not match if dissection fails
  net/sched: cls_flower: allow control of tree traversal on packet parse
    errors

 include/linux/skbuff.h       |  11 +++--
 include/uapi/linux/pkt_cls.h |   2 +
 net/core/flow_dissector.c    | 105 ++++++++++++++++++++++++-------------------
 net/sched/cls_flower.c       |  47 ++++++++++++++-----
 4 files changed, 107 insertions(+), 58 deletions(-)

-- 
2.12.2.816.g2cccc81164