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

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Message-ID: <45FEABE1.9050003@trash.net>
Date:	Mon, 19 Mar 2007 16:27:29 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Pekka Savola <pekkas@...core.fi>
CC:	netdev@...r.kernel.org
Subject: Re: 2.6.20.3-rc1 / iproute2 hoplimit 2^32-1 vs 2^8-1

Patrick McHardy wrote:
> Pekka Savola wrote:
> 
>>On kernel based on 2.6.20.3-rc1 (FC6), 'ip -6 r l' shows:
>>
>>default via fe80::212:f0ff:fe5f:c4ec dev eth1  proto kernel  metric
>>1024  expires 7191sec mtu 1500 advmss 1440 hoplimit 4294967295
>>
>>(this is the same with iproute2-ss061214 and iproute2-ss070313.)
>>
>>So, it seems that the data length for hoplimit is not quite right, or
>>it's reported as 2^32-1 instead of 2^8-1...
> 
> 
> 
> Does this fix it?


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);

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