netdev - Re: [PATCH 1/5] netlink: extended ACK reporting

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Date:   Tue, 18 Apr 2017 11:41:34 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Joe Stringer <joe@....org>
Cc:     Jiri Benc <jbenc@...hat.com>, ovs dev <dev@...nvswitch.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Pravin Shelar <pshelar@...ira.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        linux-wireless@...r.kernel.org, Jiri Pirko <jiri@...nulli.us>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        netdev <netdev@...r.kernel.org>, gvrose8192@...il.com
Subject: Re: [PATCH 1/5] netlink: extended ACK reporting

On Thu, 2017-04-13 at 14:44 -0700, Joe Stringer wrote
(something that never made it to the list, due to HTML formatting)
> 
> I think that OVS was doing some more elaborate validation than most
> users, so over time we picked up a bunch of extra parsing code that
> layers on top of nla_parse(). I took a look at trying to broaden this
> and make it useful to other users a while ago, but when I posted
> there wasn't much interest from others on it so I just moved on.
> Maybe it's about time to pick that back up.

Ah, ok. I didn't realize it was actually on top of nla_parse(). Some of
this does seem rather useful though, and having more expressive policy
would seem very useful too - I'd love to be able to express nesting
better, for example.

Also, I think we should - at least with the strict checking that Jiri
is proposing - think about checking the actual size, not just against a
minimum.

johannes