netdev - Re: [RFC] add extack errors for iptoken

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Date:   Thu, 1 Apr 2021 08:31:05 -0600
From:   David Ahern <dsahern@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        Hongren Zheng <i@...ithal.me>
Cc:     Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org
Subject: Re: [RFC] add extack errors for iptoken

On 3/31/21 9:49 PM, Stephen Hemminger wrote:
> @@ -5681,14 +5682,29 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
>  
>  	ASSERT_RTNL();
>  
> -	if (!token)
> +	if (!token) {

You forgot to add a message here.

>  		return -EINVAL;
> -	if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
> +	}
> +
> +	if (dev->flags & IFF_LOOPBACK) {
> +		NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
>  		return -EINVAL;
> -	if (!ipv6_accept_ra(idev))
> +	}
> +
> +	if (dev->flags & IFF_NOARP) {
> +		NL_SET_ERR_MSG_MOD(extack, "Device does not do discovery");

'Device does not do neighbor discovery'

>  		return -EINVAL;
> -	if (idev->cnf.rtr_solicits == 0)
> +	}
> +
> +	if (!ipv6_accept_ra(idev)) {
> +		NL_SET_ERR_MSG_MOD(extack, "Device does accept route adverts");

How about
'Router advertisements are disabled for this device'


> +		return -EINVAL;
> +	}
> +
> +	if (idev->cnf.rtr_solicits == 0) {
> +		NL_SET_ERR_MSG(extack, "Device has disabled router solicitation");

How about

'Router solicitation is disabled on device'