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net: Allow to specify ifindex when device is moved to another namespace

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Currently, we can specify ifindex on link creation. This change allows
to specify ifindex when a device is moved to another network namespace.

Even now, a device ifindex can be changed if there is another device
with the same ifindex in the target namespace. So this change doesn't
introduce completely new behavior, it adds more control to the process.

CRIU users want to restore containers with pre-created network devices.
A user will provide network devices and instructions where they have to
be restored, then CRIU will restore network namespaces and move devices
into them. The problem is that devices have to be restored with the same
indexes that they have before C/R.

Cc: Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com>
Suggested-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrei Vagin
2021-04-05 00:12:23 -07:00
committed by David S. Miller
parent d3295869c4
commit eeb85a14ee
6 changed files with 39 additions and 17 deletions
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3
include/linux/netdevice.h
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@@ -4026,7 +4026,8 @@ void __dev_notify_flags(struct net_device *, unsigned int old_flags,
int dev_change_name(struct net_device *, const char *);
int dev_set_alias(struct net_device *, const char *, size_t);
int dev_get_alias(const struct net_device *, char *, size_t);
int dev_change_net_namespace(struct net_device *, struct net *, const char *);
int dev_change_net_namespace(struct net_device *dev, struct net *net,
const char *pat, int new_ifindex);
int __dev_set_mtu(struct net_device *, int);
int dev_validate_mtu(struct net_device *dev, int mtu,
struct netlink_ext_ack *extack);