netdev - [PATCH 0/5] extended netlink ACK reporting

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Date:   Sat,  8 Apr 2017 19:48:55 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Cc:     pablo@...filter.org, Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Benc <jbenc@...hat.com>,
        David Ahern <dsa@...ulusnetworks.com>, jiri@...nulli.us
Subject: [PATCH 0/5] extended netlink ACK reporting

Hi,

After testing and fixing the ack message length calculation,
this now works.

The UAPI changes are like before - the ACK message format becomes
 [nlmsg header]
 [ack header]
 [request nlmsg header]
 [request nlmsg body (already optional) - length aligned]
 [extended ACK TLVs - this is NEW]

The extended ACK TLVs currently are:
For the error case:
 * MSG - string message
 * OFFS - offset of problem (e.g. malformed attribute)
          in the request message
 * ATTR - missing attribute ID
For the success case:
 * COOKIE - arbitrary per-subsystem cookie to identify
            the newly created object or similar

The whole behaviour can be enabled/disabled/queried using
a new socket option NETLINK_EXT_ACK.

johannes