[ovs-git] Open vSwitch: ofproto-dpif-xlate: Make flows that match ICMP fields revalidate correctly. (master)

dev at openvswitch.org dev at openvswitch.org
Tue Feb 11 16:27:53 UTC 2014


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      from  276e2864c517a13f9a3ba33086b091743096d30c (commit)

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- Log -----------------------------------------------------------------
commit c56fac1b678101b189e16f0462556c992feeffdc
Diffs: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=c56fac1b678101b189e16f0462556c992feeffdc
Author: Ben Pfaff <blp at nicira.com>
		
ofproto-dpif-xlate: Make flows that match ICMP fields revalidate correctly.
		
ICMPv4 and ICMPv6 have 8-bit "type" and "code" fields.  struct flow
uses the low 8 bits of the 16-bit tp_src and tp_dst members to
represent these fields.  The datapath interface, on the other hand,
represents them with just 8 bits each.  This means that if the high 8
bits of the masks for these fields somehow become set (meaning to
match on the nonexistent "high bits" of these fields) during
translation, then they will get chopped off by a round trip through
the datapath, and revalidation will spot that as an inconsistency and
delete the flow.  This commit avoids the problem by making sure that
only the low 8 bits of either field can be unwildcarded for ICMP.

This seems like the minimal fix for this problem, appropriate for
backporting to earlier branches.  The root of the issue is that these high
bits can get set in the match at all.  I have some leads on that, but they
require more invasive changes elsewhere.

Bug #23320.
Reported-by: Krishna Miriyala <miriyalak at vmware.com>
Signed-off-by: Ben Pfaff <blp at nicira.com>
Acked-by: Andy Zhou <azhou at nicira.com>


-----------------------------------------------------------------------

Summary of changes:
 lib/meta-flow.c              |   14 --------------
 lib/packets.h                |   14 +++++++++++++-
 ofproto/ofproto-dpif-xlate.c |   17 +++++++++++++++++
 3 files changed, 30 insertions(+), 15 deletions(-)


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