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Change netns of current thread and switch back on context exit.
For example:
with NetNSEnter("ns1"):
ip("link add dummy0 type dummy")
The command be executed in netns "ns1".
Signed-off-by: Xiao Liang <shaw.leon@gmail.com>
Link: https://patch.msgid.link/20250219125039.18024-13-shaw.leon@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>