netdev - RE: timer expiry check at icmp.c in ipv6

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Date:	Tue, 17 Jul 2012 05:11:06 +0000
From:	BALAKUMARAN KANNAN <balakumarank@...aelxsi.co.in>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: timer expiry check at icmp.c in ipv6

Dear Eric,
    Can you please explain it into bit further. Actually what I want to know is how the preferred lifetime value of a router advertisement is processed?, Where it is stored? and while sending the ICMP_REPLY how that preferred lifetime value considered before actually sending the packet? I cannot able to find the relation between icmpv6_echo_reply and fib6_run_gc(). I am very new to kernel source. Kindly help me.

thank you.
________________________________________
From: netdev-owner@...r.kernel.org [netdev-owner@...r.kernel.org] on behalf of Eric Dumazet [eric.dumazet@...il.com]
Sent: Monday, July 16, 2012 8:03 PM
To: BALAKUMARAN KANNAN
Cc: netdev@...r.kernel.org
Subject: Re: timer expiry check at icmp.c in ipv6

On Mon, 2012-07-16 at 13:44 +0000, BALAKUMARAN KANNAN wrote:
> Dear all,
>
> In kernel-3.0.26 code net/ipv6/icmp.c, while sending ICMP reply where
> it checks for the timer expiry. It should check the value given by a
> router advertisement. I think the expiry value is stored in
> rt->rt6_expires in ndisc.c (line no: 1284). Then while sending an ICMP
> reply, it should check with the expiry timer right? Where that check
> is happening? Please somebody explain me.
>
> Thank you.

Its probably done in net/ipv6/ip6_fib.c

fib6_gc_timer_cb() -> fib6_run_gc()

Every 30 seconds.

(you can change /proc/sys/net/ipv6/route/gc_interval )



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