netdev - A problem about ICMP packet-too-big message handler

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Date:	Tue, 27 Jan 2015 20:58:53 +0800
From:	Yang Yingliang <yangyingliang@...wei.com>
To:	netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: A problem about ICMP packet-too-big message handler

Hi,

My kernel is 3.10 LTS.

I got a problem here about handling ICMP packet-too-big message.

Before sending a packet-too-big packet :

# ip -6 route list table local
local ::1 dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80::1 dev lo  metric 0 	//It  does not have expire value
local fe80::200:ff:fe00:0 dev lo  metric 0 
local fe80::200:ff:fe00:0 dev lo  metric 0 
local fe80::200:ff:fe00:0 dev lo  metric 0 
local fe80::200:ff:fe00:0 dev lo  metric 0 
local fe80::200:ff:fe00:2 dev lo  metric 0 
local fe80::5054:ff:fe12:3456 dev lo  metric 0


After sending a packet-too-big packet

ip -6 route list table local
local ::1 dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80:: dev lo  metric 0 
local fe80::1 dev lo  metric 0  expires _597_  //It has expire value
local fe80::200:ff:fe00:0 dev lo  metric 0 
local fe80::200:ff:fe00:0 dev lo  metric 0 
local fe80::200:ff:fe00:0 dev lo  metric 0 
local fe80::200:ff:fe00:0 dev lo  metric 0 
local fe80::200:ff:fe00:2 dev lo  metric 0 
local fe80::5054:ff:fe12:3456 dev lo  metric 0

When time is up, I can't ping fe80::1 .
Is it ok or a bug ?

Regards,
Yang

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