From: Eric Dumazet <eric.dumazet@gmail.com>
To: BALAKUMARAN KANNAN <balakumarank@tataelxsi.co.in>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: RE: timer expiry check at icmp.c in ipv6
Date: Tue, 17 Jul 2012 07:39:23 +0200 [thread overview]
Message-ID: <1342503563.2626.38.camel@edumazet-glaptop> (raw)
In-Reply-To: <4A71D24947E78D43BC584A7CD4391A41017DBDB4@SIXPRD0410MB359.apcprd04.prod.outlook.com>
On Tue, 2012-07-17 at 05:11 +0000, BALAKUMARAN KANNAN wrote:
> 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.
# find net/ipv6|xargs grep -n RTF_EXPIRES
net/ipv6/ip6_fib.c:675: if (!(iter->rt6i_flags & RTF_EXPIRES))
net/ipv6/ip6_fib.c:677: if (!(rt->rt6i_flags & RTF_EXPIRES))
net/ipv6/ip6_fib.c:740: (rt->rt6i_flags & (RTF_EXPIRES | RTF_CACHE)))
net/ipv6/ip6_fib.c:1545: if (rt->rt6i_flags & RTF_EXPIRES && rt->dst.expires) {
net/ipv6/route.c:307: if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from)
net/ipv6/route.c:370: if (rt->rt6i_flags & RTF_EXPIRES) {
net/ipv6/route.c:375: return (ort->rt6i_flags & RTF_EXPIRES) &&
net/ipv6/route.c:1397: if (cfg->fc_flags & RTF_EXPIRES)
net/ipv6/route.c:1908: RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
net/ipv6/route.c:2476: if (!(rt->rt6i_flags & RTF_EXPIRES))
net/ipv6/addrconf.c:805: } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
net/ipv6/addrconf.c:1902: flags |= RTF_EXPIRES;
net/ipv6/addrconf.c:2212: flags = RTF_EXPIRES;
net/ipv6/addrconf.c:3420: flags = RTF_EXPIRES;
net/ipv6/ip6_fib.c.orig:675: if (!(iter->rt6i_flags & RTF_EXPIRES))
net/ipv6/ip6_fib.c.orig:677: if (!(rt->rt6i_flags & RTF_EXPIRES))
net/ipv6/ip6_fib.c.orig:740: (rt->rt6i_flags & (RTF_EXPIRES | RTF_CACHE)))
net/ipv6/ip6_fib.c.orig:1545: if (rt->rt6i_flags & RTF_EXPIRES && rt->dst.expires) {
What are the expected preferred lifetimes of a router ?
If granularity is one second, the garbage collection done every 30
seconds is not good.
But if its one hour, or one day, having a 30 seconds delay at the end of
the period isnt critical.
prev parent reply other threads:[~2012-07-17 5:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-16 13:44 timer expiry check at icmp.c in ipv6 BALAKUMARAN KANNAN
2012-07-16 14:33 ` Eric Dumazet
2012-07-17 5:11 ` BALAKUMARAN KANNAN
2012-07-17 5:39 ` Eric Dumazet [this message]
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