netdev - Re: [PATCH][IPv6] Add ifindex field in ND user option messages

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Message-Id: <20071112.165656.149058082.davem@davemloft.net>
Date:	Mon, 12 Nov 2007 16:56:56 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	linkfanel@...oo.fr
Cc:	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org,
	rdenis@...phalempin.com
Subject: Re: [PATCH][IPv6] Add ifindex field in ND user option messages

From: Pierre Ynard <linkfanel@...oo.fr>
Date: Tue, 13 Nov 2007 01:54:13 +0100

> Userland neighbor discovery options are typically heavily involved with
> the interface on which thay are received: add a missing ifindex field to
> the original struct. Thanks to Rémi Denis-Courmont.
> 
> Signed-off-by: Pierre Ynard <linkfanel@...oo.fr>

Unfortunately you cannot change the layout of a structure
already exported to userspace, it is part of the ABI.

You'll need to create a new netlink attribute or similar
in order to provide this information.
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