Jakub Kicinski 690252f19f
netlink: add support for ext_ack missing attributes ...
There is currently no way to report via extack in a structured way
that an attribute is missing. This leads to families resorting to
string messages.
Add a pair of attributes - @offset and @type for machine-readable
way of reporting missing attributes. The @offset points to the
nest which should have contained the attribute, @type is the
expected nla_type. The offset will be skipped if the attribute
is missing at the message level rather than inside a nest.
User space should be able to figure out which attribute enum
(AKA attribute space AKA attribute set) the nest pointed to by
@offset is using.
Reviewed-by: Johannes Berg <johannes@sipsolutions.net >
Signed-off-by: Jakub Kicinski <kuba@kernel.org >
Signed-off-by: Paolo Abeni <pabeni@redhat.com >
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