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netns: enable to inherit devconf from current netns

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The goal is to be able to inherit the initial devconf parameters from the
current netns, ie the netns where this new netns has been created.

This is useful in a containers environment where /proc/sys is read only.
For example, if a pod is created with specifics devconf parameters and has
the capability to create netns, the user expects to get the same parameters
than his 'init_net', which is not the real init_net in this case.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel
2020-05-13 15:58:43 +02:00
committed by David S. Miller
parent 74a1c05916
commit 9efd6a3cec
4 changed files with 44 additions and 10 deletions
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4
Documentation/admin-guide/sysctl/net.rst
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@@ -339,7 +339,9 @@ settings from init_net and for IPv6 we reset all settings to default.
If set to 1, both IPv4 and IPv6 settings are forced to inherit from
current ones in init_net. If set to 2, both IPv4 and IPv6 settings are
forced to reset to their default values.
forced to reset to their default values. If set to 3, both IPv4 and IPv6
settings are forced to inherit from current ones in the netns where this
new netns has been created.
Default : 0 (for compatibility reasons)