netdev - Re: 2.6.20.3-rc1 / iproute2 hoplimit 2^32-1 vs 2^8-1

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Message-ID: <Pine.LNX.4.64.0703201026300.25136@netcore.fi>
Date:	Tue, 20 Mar 2007 10:27:51 +0200 (EET)
From:	Pekka Savola <pekkas@...core.fi>
To:	David Miller <davem@...emloft.net>
cc:	kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: 2.6.20.3-rc1 / iproute2 hoplimit 2^32-1 vs 2^8-1

On Mon, 19 Mar 2007, David Miller wrote:
> From: Patrick McHardy <kaber@...sh.net>
> Date: Mon, 19 Mar 2007 16:27:29 +0100
>
>> Mhh actually this looks intentional:
>>
>> icmpv6_send and some other output functions do:
>> 	int hlimit;
>> ...
>>         if (hlimit < 0)
>>                 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
>>         if (hlimit < 0)
>>                 hlimit = ipv6_get_hoplimit(dst->dev);
>
> Yep, negative value has a specific meaning.

Which seems to indicate that the kernel-internal implementation has a 
need to store a negative TTL.  Reporting it to the userspace as a 
negative doesn't seem right though?

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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