netns: add support of NETNSA_TARGET_NSID
Like it was done for link and address, add the ability to perform get/dump in another netns by specifying a target nsid attribute. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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