Re: TAHI IPv6 testing of kernel 2.6.20

[David Miller <davem@davemloft.net>]

From: William Seppeler <wrs@pt.com>
Date: Thu, 15 May 2008 15:21:14 -0400

You'll get a lot more feedback from the networking developers
if you actually send it to the list they subscribe to.
Thus, netdev CC:'d

> I noticed on the TAHI website that kernel.org had the 2.6.20 kernel 
> certified for IPv6 Ready Logo Phase2 as a router device. 
> 
> The application was submitted on 20070827 (Application ID: 
> US-2-C-20070827-000142) and certified on 20070926. 
> 
> I'm currently testing a 2.6.20 kernel using Self_Test_1.4.14 (performing 
> Phase2 host testing - ipv6ready_p2_host).  It passes all tests except for 
> one.  I'm failing test: 
> 
>     v6LC_2_3_6_G - Redirected to Alternate Router: Invalid (Target Address 
> is Multicast) 
> 
> Based on the kernel.org application date, I assume the application was 
> submitted using TAHI Self_Test_1.4.8.  I see from the Self_Test CHANGELOG 
> that test v6LC_2_3_6_G was modified after the application date: 
> 
>     2007/09/26    Yukiyo Akisada
>        nd.p2/v6LC_2_3_6_G.def - correct packet definition 
> 
> 
> Q: Has the kernel.org group retested the 2.6.20 kernel using any of the 
> recent Self_Test releases?  In particular, Self_Test_1.4.14 or greater? 
> And were there any failures? 
> 
> As for details into the v6LC_2_3_6_G test failure: 
> 
> The log shows the test fails due to processing an invalid redirect packet 
> (ie: it's a negative test).  The redirect packet contains a multicast 
> address as a target address.  RFC2461 (p.26) doesn't explicitly state this 
> is invalid: 
> 
>       Target Address 
>                      An IP address that is a better first hop to use for
>                     the ICMP Destination Address.  When the target is
>                     the actual endpoint of communication, i.e., the
>                     destination is a neighbor, the Target Address field
>                     MUST contain the same value as the ICMP Destination
>                     Address field.  Otherwise the target is a better
>                     first-hop router and the Target Address MUST be the
>                     router's link-local address so that hosts can
>                     uniquely identify routers.
> 
> But the test does appear to make sense based on the last sentence.  The 
> linux kernel I'm testing shows an echo response trying to use the 
> multicast address from the redirect packet as it's first hop.  This is 
> what causes the test to fail.  The expectation is that the linux kernel 
> would ignore the redirect packet entirely. 
> 
> As stated, this is the ONLY test in the whole Phase2 test suite that 
> fails.  I understand the failure, but I don't understand how the 2.6.20 
> kernel is Phase2 certified.  At least not with the current Self_Test test 
> suite. 
> 
> Q: Has anyone else had issues in getting the 2.6.20 kernel to pass all 
> TAHI IPv6 Ready Logo Phase2 tests? 
> 
> Please CC answers to wrs@pt.com
> 
> Thank You, 
> 
> ========================================
> William Seppeler
> Test Engineer
> Performance Technologies Inc.
> 205 Indigo Creek Dr.
> Rochester, NY  14626
> 
> Phone:  (585) 256-0200, Fax:  (585) 256-0791
> Email:  wrs@pt.com, Web:  www.pt.com
> ========================================
> 
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