From: zhuyj <zyjzyj2000@gmail.com>
To: netdev@vger.kernel.org, "David S. Miller" <davem@davemloft.net>,
ebiederm@xmission.com, ja@ssi.bg, zhuyj <zyjzyj2000@gmail.com>,
"Yang, Zhangle (Eric)" <Zhangle.Yang@windriver.com>,
"Tao, Yue" <Yue.Tao@windriver.com>,
"Zadoyan, Grant" <Grant.Zadoyan@windriver.com>
Subject: Should linux send netlink message as it is deleting that routing entry?
Date: Thu, 10 Apr 2014 16:23:26 +0800 [thread overview]
Message-ID: <534654FE.3040804@gmail.com> (raw)
Hi, David
With ubuntu 12.04, I run the following to reproduce this defect.
1) Configure an interface
ifconfig eth1 150.0.0.1/24 up
2) Add routing entry via that interface address
route add -net 200.0.0.0/24 gw 150.0.0.1
3) Change the ip address on that interface as shown below.
ifconfig eth1 151.0.0.1/24 up
4) Check netlink messages with "ip monitor all". There is no route
delete netlink message.
[ADDR]Deleted 3: eth1 inet 150.0.0.1/24 brd 150.0.0.255 scope global eth1
[ROUTE]Deleted 150.0.0.0/24 dev eth1 proto kernel scope link src
150.0.0.1
[ROUTE]Deleted broadcast 150.0.0.255 dev eth1 table local proto
kernel scope link src 150.0.0.1
[ROUTE]Deleted broadcast 150.0.0.0 dev eth1 table local proto kernel
scope link src 150.0.0.1
[ROUTE]Deleted local 150.0.0.1 dev eth1 table local proto kernel scope
host src 150.0.0.1
[NEIGH]224.0.0.251 dev eth1 lladdr 01:00:5e:00:00:fb NOARP
[NEIGH]224.0.0.22 dev eth1 lladdr 01:00:5e:00:00:16 NOARP
[ADDR]3: eth1 inet 151.0.0.1/16 brd 151.0.255.255 scope global eth1
[ROUTE]local 151.0.0.1 dev eth1 table local proto kernel scope host
src 151.0.0.1
[ROUTE]broadcast 151.0.255.255 dev eth1 table local proto kernel scope
link src 151.0.0.1
[ROUTE]151.0.0.0/16 dev eth1 proto kernel scope link src 151.0.0.1
[ROUTE]broadcast 151.0.0.0 dev eth1 table local proto kernel scope
link src 151.0.0.1
[ADDR]Deleted 3: eth1 inet 151.0.0.1/16 brd 151.0.255.255 scope
global eth1
[ROUTE]Deleted 151.0.0.0/16 dev eth1 proto kernel scope link src
151.0.0.1
[ROUTE]Deleted broadcast 151.0.255.255 dev eth1 table local proto
kernel scope link src 151.0.0.1
[ROUTE]Deleted broadcast 151.0.0.0 dev eth1 table local proto kernel
scope link src 151.0.0.1
[ROUTE]Deleted local 151.0.0.1 dev eth1 table local proto kernel scope
host src 151.0.0.1
[NEIGH]224.0.0.22 dev eth1 lladdr 01:00:5e:00:00:16 NOARP
[ADDR]3: eth1 inet 151.0.0.1/24 brd 151.0.0.255 scope global eth1
[ROUTE]local 151.0.0.1 dev eth1 table local proto kernel scope host
src 151.0.0.1
[ROUTE]broadcast 151.0.0.255 dev eth1 table local proto kernel scope
link src 151.0.0.1
[ROUTE]151.0.0.0/24 dev eth1 proto kernel scope link src 151.0.0.1
[ROUTE]broadcast 151.0.0.0 dev eth1 table local proto kernel scope
link src 151.0.0.1
There is no netlink message to notify that 200.0.0.0/24 is deleted. But
in fact, this 200.0.0.0/24 route item disappears.
I checked the source code, and I found the following is the process to
delete static routes when the attached interface is deleted.
1) | fib_netdev_event() {
1) | fib_disable_ip() {
1) 1.284 us | fib_sync_down_dev();
1) | fib_flush() {
1) | fib_table_flush() {
1) 0.129 us | fib_release_info();
1) 0.351 us | fib_release_info();
1) 4.605 us | }
1) | fib_table_flush() {
1) 0.096 us | fib_release_info();
1) 0.255 us | fib_release_info();
1) 4.770 us | }
1) + 11.787 us | }
1) ! 315.273 us | }
1) ! 315.888 us | }
But there is no netlink message sent here.
Should linux send netlink message as it is deleting that 200.0.0.0/24
routing entry?
Best Regards!
Zhu Yanjun
next reply other threads:[~2014-04-10 8:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-10 8:23 zhuyj [this message]
2014-04-11 9:15 ` Should linux send netlink message as it is deleting that routing entry? zhuyj
2014-04-11 18:30 ` Stephen Hemminger
2014-04-16 10:50 ` zhuyj
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