netdev - Re: [PATCH net-next] Revert "rtnetlink: return EINVAL when request cannot succeed"

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Date:   Wed, 20 Apr 2022 16:48:15 +0200
From:   Guillaume Nault <gnault@...hat.com>
To:     Florent Fourcot <florent.fourcot@...irst.fr>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org,
        Stephen Hemminger <stephen@...workplumber.org>,
        Brian Baboch <brian.baboch@...irst.fr>
Subject: Re: [PATCH net-next] Revert "rtnetlink: return EINVAL when request
 cannot succeed"

On Tue, Apr 19, 2022 at 02:51:51PM +0200, Florent Fourcot wrote:
> This reverts commit b6177d3240a4
> 
> ip-link command is testing kernel capability by sending a RTM_NEWLINK
> request, without any argument. It accepts everything in reply, except
> EOPNOTSUPP and EINVAL (functions iplink_have_newlink / accept_msg)
> 
> So we must keep compatiblity here, invalid empty message should not
> return EINVAL

"ip link" is currently unusable on net-next without this patch.
Can we please rush this fix in?

Tested-by: Guillaume Nault <gnault@...hat.com>
Fixes: b6177d3240a4 ("rtnetlink: return EINVAL when request cannot succeed")

> Signed-off-by: Florent Fourcot <florent.fourcot@...irst.fr>
> ---
>  net/core/rtnetlink.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index b943336908a7..73f2cbc440c9 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -3457,7 +3457,7 @@ static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
>  			return rtnl_group_changelink(skb, net,
>  						nla_get_u32(tb[IFLA_GROUP]),
>  						ifm, extack, tb);
> -		return -EINVAL;
> +		return -ENODEV;
>  	}
>  
>  	if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
> -- 
> 2.30.2
>