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nl_addr() and nl_route() take an 'op' selector which affects a number of
parameters to the netlink call. Unfortunately when we introduced this
option a bug was introduced so that we always use the interface index for
the host side, rather than the one for the pasta namespace.
Really, the entire interface to nl_addr() and nl_route() is pretty bad:
it's tightly coupled with the use cases of its callers. This is a minimal
fix which doesn't address that, but also doesn't make it significantly
worse.
Link: https://bugs.passt.top/show_bug.cgi?id=59
Fixes: 2fe046185634 ("netlink: Add functionality to copy routes from outer namespace")
Fixes: e89da3cf03b2 ("netlink: Add functionality to copy addresses from outer namespace")
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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