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

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Message-Id: <20070320.093949.117333367.yoshfuji@linux-ipv6.org>
Date:	Tue, 20 Mar 2007 09:39:49 +0100 (CET)
From:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
To:	pekkas@...core.fi
Cc:	davem@...emloft.net, kaber@...sh.net, netdev@...r.kernel.org,
	yoshfuji@...ux-ipv6.org
Subject: Re: 2.6.20.3-rc1 / iproute2 hoplimit 2^32-1 vs 2^8-1

In article <Pine.LNX.4.64.0703201026300.25136@...core.fi> (at Tue, 20 Mar 2007 10:27:51 +0200 (EET)), Pekka Savola <pekkas@...core.fi> says:

> 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?

I think it is better to fix iproute2 instead, 1) to treat the variable as 
int, or, 2) not to show such variable.

--yoshfuji
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