netdev - Re: [PATCH net-next v2 1/5] rtnetlink: provide permanent hardware address in RTM

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Date:   Tue, 10 Dec 2019 21:23:24 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jiri Pirko <jiri@...nulli.us>
Cc:     Michal Kubecek <mkubecek@...e.cz>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        John Linville <linville@...driver.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/5] rtnetlink: provide permanent hardware
 address in RTM_NEWLINK

On Tue, 2019-12-10 at 21:22 +0100, Johannes Berg wrote:
> On Tue, 2019-12-10 at 09:51 -0800, Jakub Kicinski wrote:
> > On Tue, 10 Dec 2019 14:07:53 +0100 (CET), Michal Kubecek wrote:
> > > @@ -1822,6 +1826,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
> > >  	[IFLA_PROP_LIST]	= { .type = NLA_NESTED },
> > >  	[IFLA_ALT_IFNAME]	= { .type = NLA_STRING,
> > >  				    .len = ALTIFNAMSIZ - 1 },
> > > +	[IFLA_PERM_ADDRESS]	= { .type = NLA_REJECT },
> > >  };
> > >  
> > >  static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
> > 
> > Jiri, I just noticed ifla_policy didn't get strict_start_type set when
> > ALT_IFNAME was added, should we add it in net? 🤔
> 
> Does it need one? It shouldn't be used with
> nla_parse_nested_deprecated(), and if it's used with nla_parse_nested()
> then it doesn't matter?

No, wait. I misread, you said "when ALT_IFNAME was added" but somehow I
managed to read "when it was added"...

So yeah, it should have one. Dunno about net, your call. I'd probably
not bother for an NLA_REJECT attribute, there's little use including it
anyway.

johannes