On Fri, Jan 18, 2019 at 4:25 PM Nicolas Dichtel
<nicolas.dich...@6wind.com> wrote:
>
> Le 18/01/2019 à 08:27, Cong Wang a écrit :
> > There have been many people complaining about the inconsistent
> > behaviors of IPv4 and IPv6 devconf when creating new network
> > namespaces. Currently, for IPv4, we inherit all current settings
> > from init_net, but for IPv6 we reset all setting to default.
> >
> > This patch introduces a new /proc file
> > /proc/sys/net/core/devconf_inherit_init_net to control the
> > behavior of whether to inhert sysctl current settings from init_net.
> > This file itself is only available in init_net.
> >
> > As demonstrated below:
> >
> > Initial setup in init_net:
> > # cat /proc/sys/net/ipv4/conf/all/rp_filter
> > 2
> > # cat /proc/sys/net/ipv6/conf/all/accept_dad
> > 1
> >
> > Default value 0 (current behavior):
> > # ip netns del test
> > # ip netns add test
> > # ip netns exec test cat /proc/sys/net/ipv4/conf/all/rp_filter
> > 2
> > # ip netns exec test cat /proc/sys/net/ipv6/conf/all/accept_dad
> > 0
> >
> > Set to 1 (inherit from init_net):
> > # echo 1 > /proc/sys/net/core/devconf_inherit_init_net
> > # ip netns del test
> > # ip netns add test
> > # ip netns exec test cat /proc/sys/net/ipv4/conf/all/rp_filter
> > 2
> > # ip netns exec test cat /proc/sys/net/ipv6/conf/all/accept_dad
> > 1
> >
> > Set to 2 (reset to default):
> > # echo 2 > /proc/sys/net/core/devconf_inherit_init_net
> > # ip netns del test
> > # ip netns add test
> > # ip netns exec test cat /proc/sys/net/ipv4/conf/all/rp_filter
> > 0
> > # ip netns exec test cat /proc/sys/net/ipv6/conf/all/accept_dad
> > 0
> >
> > Set to a value out of range (invalid):
> > # echo 3 > /proc/sys/net/core/devconf_inherit_init_net
> > -bash: echo: write error: Invalid argument
> > # echo -1 > /proc/sys/net/core/devconf_inherit_init_net
> > -bash: echo: write error: Invalid argument
> >
> > Reported-by: Zhu Yanjun <yanjun....@windriver.com>
> > Reported-by: Tonghao Zhang <xiangxia.m....@gmail.com>
> > Cc: Nicolas Dichtel <nicolas.dich...@6wind.com>
> > Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
> Nice!
>
> Acked-by: Nicolas Dichtel <nicolas.dich...@6wind.com>
Acked-by: Tonghao Zhang <xiangxia.m....@gmail.com>
