netdev - get receiving interface index while no message is received

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Date:	Fri, 08 Aug 2008 12:27:06 +0800
From:	Yang Hongyang <yanghy@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org
Subject: get receiving interface index while no message is received


when I use getsockopt(sk, IPPROTO_IPV6, IPV6_2292PKTOPTIONS,(char *)incmsg, &cnt)
to get receiving interface index while no message is received,

What interface index should be returned?
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