netdev - Re: [RFC] Arp announce (for Xen)

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Message-Id: <20070305.203536.92584097.davem@davemloft.net>
Date:	Mon, 05 Mar 2007 20:35:36 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...ux-foundation.org
Cc:	jeremy@...p.org, ak@....de, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, chrisw@...s-sol.org,
	zach@...are.com, rusty@...tcorp.com.au, ian.pratt@...source.com,
	Christian.Limpach@...cam.ac.uk, netdev@...r.kernel.org,
	jeff@...zik.org
Subject: Re: [RFC] Arp announce (for Xen)

From: Stephen Hemminger <shemminger@...ux-foundation.org>
Date: Thu, 1 Mar 2007 17:30:30 -0800

> What about implementing the unused arp_announce flag on the inetdevice?
> Something like the following.  Totally untested...
> 
> Looks like it either was there (and got removed) or was planned but
> never implemented.

This idea is fine.  But:

> +	case NETDEV_CHANGEADDR:
> +		/* Send gratuitous ARP in case of address change or new device */
> +		if (IN_DEV_ARP_ANNOUNCE(in_dev))
> +			arp_send(ARPOP_REQUEST, ETH_P_ARP,
> +				 in_dev->ifa_list->ifa_address, dev,
> +				 in_dev->ifa_list->ifa_address, NULL, 
> +				 dev->dev_addr, NULL);

We'll need to make sure the appropriate 'arp_anounce' address
selection is employed here.

One idea is to change arp_solicit() such that it can be invoked in
this context, or provide a new helper function which will do the
source address selection rules of 'arp_announce' and then invoke
arp_send() as appropriate for us.
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