[PATCH net-next v9 04/11] ieee802154: 6lowpan: Validate link netns in newlink() of rtnl_link_ops

[Kuniyuki Iwashima]

From: Xiao Liang <shaw.leon at gmail.com>
Date: Mon, 10 Feb 2025 21:29:55 +0800
> Device denoted by IFLA_LINK is in link_net (IFLA_LINK_NETNSID) or
> source netns by design, but 6lowpan uses dev_net.
> 
> Note dev->netns_local is set to true and currently link_net is
> implemented via a netns change. These together effectively reject
> IFLA_LINK_NETNSID.
> 
> This patch adds a validation to ensure link_net is either NULL or
> identical to dev_net. Thus it would be fine to continue using dev_net
> when rtnetlink core begins to create devices directly in target netns.
> 
> Signed-off-by: Xiao Liang <shaw.leon at gmail.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu at amazon.com>