netdev - Re: [PATCH net-next] rtnetlink: return ENODEV when ifname does not exist and group is given

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Date:   Fri, 1 Apr 2022 15:57:52 +0200
From:   Florent Fourcot <florent.fourcot@...irst.fr>
To:     Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     Brian Baboch <brian.baboch@...irst.fr>
Subject: Re: [PATCH net-next] rtnetlink: return ENODEV when ifname does not
 exist and group is given

Hello,

> Please run the patches thru ./scripts/get_maintainer.pl.
> netdev is high volume (and Gmail hates it), we really need people 
> to CC potential reviewers.

Sorry for that. I was unable to choose relevant reviewers in 
get_maintainer output (too few or too many lines). I will add CC in next 
post.

> 
> Would it be slightly cleaner to have a similar check in
> validate_linkmsg()? Something like:
> 
> 	if (!dev && !ifm->ifi_index && tb[IFLA_GROUP] &&
> 	    (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]))

That will add some complexity in validate_linkmsg, since we will need to 
check NLM_F_CREATE flag before (it's probably not an error when 
NLM_F_CREATE is set), and to give ifm as argument to check ifi_index.

I do not have a strong opinion on this topic, and if you think your idea 
is a better solution I can give a try in a v2.

Thanks,

-- 
Florent Fourcot