netdev - Re: [PATCH net-next 1/4] net: rtnetlink: support for fdb get

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Date:   Fri, 14 Dec 2018 11:54:21 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     David Ahern <dsa@...ulusnetworks.com>
Cc:     Roopa Prabhu <roopa@...ulusnetworks.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH net-next 1/4] net: rtnetlink: support for fdb get

On Fri, 14 Dec 2018 12:42:21 -0700, David Ahern wrote:
> On 12/14/18 12:37 PM, Jakub Kicinski wrote:
> > Oh, so we'd use the STRICT checking in doit for the first time?  I
> > better send that rename patch then..  
> 
> IMHO, no. The flag is for older userspace that could be sending junk in
> the request. All new code should do strict checking without the flag set
> to ensure only proper requests are handled.

I'm going back and forth on that in my head.  IDK if new user space
shouldn't be able to do a get request on an old kernel which doesn't
understand some of the attributes.  Grey area.. perhaps it needs to be
decided on case by case basis?  For my stats work I think returning too
many stats if what is affectively a filter is not understood may be a
good option.  Perhaps for fdb get it makes more sense to error out.
hmm..