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netns: add rtnl cmd to add and get peer netns ids

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With this patch, a user can define an id for a peer netns by providing a FD or a
PID. These ids are local to the netns where it is added (ie valid only into this
netns).

The main function (ie the one exported to other module), peernet2id(), allows to
get the id of a peer netns. If no id has been assigned by the user, this
function allocates one.

These ids will be used in netlink messages to point to a peer netns, for example
in case of a x-netns interface.

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 2015-01-15 15:11:15 +01:00 • committed by David S. Miller
parent 4de8b41370
commit 0c7aecd4bd
6 changed files with 245 additions and 0 deletions
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5
include/uapi/linux/rtnetlink.h
View file

@ -132,6 +132,11 @@ enum {
RTM_GETMDB = 86,
#define RTM_GETMDB RTM_GETMDB
RTM_NEWNSID = 88,
#define RTM_NEWNSID RTM_NEWNSID
RTM_GETNSID = 90,
#define RTM_GETNSID RTM_GETNSID
__RTM_MAX,
#define RTM_MAX (((__RTM_MAX + 3) & ~3) - 1)
};