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netlink: extended ACK reporting

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Add the base infrastructure and UAPI for netlink extended ACK
reporting. All "manual" calls to netlink_ack() pass NULL for now and
thus don't get extended ACK reporting.

Big thanks goes to Pablo Neira Ayuso for not only bringing up the
whole topic at netconf (again) but also coming up with the nlattr
passing trick and various other ideas.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg
2017-04-12 14:34:04 +02:00
committed by David S. Miller
parent fb9eb899a6
commit 2d4bc93368
17 changed files with 153 additions and 34 deletions
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2
kernel/audit.c
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@@ -1402,7 +1402,7 @@ static void audit_receive_skb(struct sk_buff *skb)
err = audit_receive_msg(skb, nlh);
/* if err or if this message says it wants a response */
if (err || (nlh->nlmsg_flags & NLM_F_ACK))
netlink_ack(skb, nlh, err);
netlink_ack(skb, nlh, err, NULL);
nlh = nlmsg_next(nlh, &len);
}