linux-kernel - [PATCH V2 0/1] ipv4: net namespace does not inherit network configurations

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Date:	Thu, 21 Aug 2014 10:32:00 +0800
From:	Zhu Yanjun <zyjzyj2000@...il.com>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	zyjzyj2000@...il.com, Yue.Tao@...driver.com,
	alexandre.dietsch@...driver.com, davem@...emloft.net,
	honkiko@...il.com, cwang@...pensource.com
Cc:	Zhu Yanjun <Yanjun.Zhu@...driver.com>
Subject: [PATCH V2 0/1] ipv4: net namespace does not inherit network configurations

V2: Following the advice from Cong Wang, I submit a patch as normal.

Hi,all

I did a test on kernel3.16 rc6:

root@...u1:~# echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
root@...u1:~# echo 1 > /proc/sys/net/ipv4/conf/all/forwarding
root@...u1:~# ip netns list
root@...u1:~# ip netns add fib1
root@...u1:~# ip netns exec fib1 bash
root@...u1:~# cat /proc/sys/net/ipv6/conf/all/forwarding
0
root@...u1:~# cat /proc/sys/net/ipv4/conf/all/forwarding
1

The behavior of ipv4 and ipv6 is very inconsistent. I checked
the kernel source code. I found that from this patch
[ipv6: fix bad free of addrconf_init_net], the above difference
appeared.

Since a net namespace is independent to another. That is, there
is no any relationship between the net namespaces. So the behavior
of ipv4 is not correct.

Based on this patch [ipv6: fix bad free of addrconf_init_net], I made
a new patch to fix this problem on ipv4.

Any reply is appreciated. 

Zhu Yanjun (1):
  ipv4: net namespace does not inherit network configurations

 net/ipv4/devinet.c | 29 ++++++++++++-----------------
 1 file changed, 12 insertions(+), 17 deletions(-)

-- 
1.9.1

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