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[0/2] netlink: export policy on validation failures

Message ID 20201006123202.57898-1-johannes@sipsolutions.net
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Series netlink: export policy on validation failures | expand

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Johannes Berg Oct. 6, 2020, 12:32 p.m. UTC 
Export the policy used for attribute validation when it fails,
so e.g. for an out-of-range attribute userspace immediately gets
the valid ranges back.

Tested using nl80211/iw in a few scenarios, seems to work fine
and return the policy back, e.g.

kernel reports: integer out of range
policy: 04 00 0b 00 0c 00 04 00 01 00 00 00 00 00 00 00 
        ^ padding
                    ^ minimum allowed value
policy: 04 00 0b 00 0c 00 05 00 ff ff ff ff 00 00 00 00 
        ^ padding
                    ^ maximum allowed value
policy: 08 00 01 00 04 00 00 00 
        ^ type 4 == U32

for an out-of-range case.

johannes