netdev - Re: [PATCH v2 net-next] net: ipv6: send unsolicited NA if enabled for all interfaces

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Date:   Mon, 24 Apr 2017 11:42:57 +0200
From:   Simon Horman <simon.horman@...ronome.com>
To:     David Ahern <dsa@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org, hannes@...essinduktion.org
Subject: Re: [PATCH v2 net-next] net: ipv6: send unsolicited NA if enabled
 for all interfaces

On Sat, Apr 22, 2017 at 09:10:13AM -0700, David Ahern wrote:
> When arp_notify is set to 1 for either a specific interface or for 'all'
> interfaces, gratuitous arp requests are sent. Since ndisc_notify is the
> ipv6 equivalent to arp_notify, it should follow the same semantics.
> Commit 4a6e3c5def13 ("net: ipv6: send unsolicited NA on admin up") sends
> the NA on admin up. The final piece is checking devconf_all->ndisc_notify
> in addition to the per device setting. Add it.
> 
> Fixes: 5cb04436eef6 ("ipv6: add knob to send unsolicited ND on link-layer address change")
> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>

Reviewed-by: Simon Horman <simon.horman@...ronome.com>

> ---
> v2
> - update commit message with subject of commit 4a6e3c5def13 per comment
>   from Sergei
> 
>  net/ipv6/ndisc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
> index b23822e64228..d310dc41209a 100644
> --- a/net/ipv6/ndisc.c
> +++ b/net/ipv6/ndisc.c
> @@ -1753,7 +1753,8 @@ static int ndisc_netdev_event(struct notifier_block *this, unsigned long event,
>  		idev = in6_dev_get(dev);
>  		if (!idev)
>  			break;
> -		if (idev->cnf.ndisc_notify)
> +		if (idev->cnf.ndisc_notify ||
> +		    net->ipv6.devconf_all->ndisc_notify)
>  			ndisc_send_unsol_na(dev);
>  		in6_dev_put(idev);
>  		break;
> -- 
> 2.1.4
>