netdev - ipv6: RTM_GETROUTE inconsistent interpretation of RTA

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Message-ID: <20120401091807.2f4614f2@pixies.home.jungo.com>
Date:	Sun, 1 Apr 2012 09:18:07 +0300
From:	Shmulik Ladkani <shmulik.ladkani@...il.com>
To:	netdev@...r.kernel.org, davem@...emloft.net
Cc:	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net
Subject: ipv6: RTM_GETROUTE inconsistent interpretation of RTA_IIF

(Bump)

Any reason not to submit a patch that fixes the below issue?

Regards,
Shmulik

On Thu, 29 Mar 2012 15:03:11 +0200 Shmulik Ladkani <shmulik.ladkani@...il.com> wrote:
> Hi,
> 
> In IPv4, if the RTA_IIF attribute is specified in an RTM_GETROUTE
> message, then a route is searched as if a packet was received on the
> specified iif interface - i.e. 'inet_rtm_getroute()' calls
> 'ip_route_input()'.
> 
> However in IPv6, RTA_IIF is not interpreted in the same way:
> 'inet6_rtm_getroute()' always calls 'ip6_route_output()', regardless the
> RTA_IIF attribute.
> 
> As a result, in IPv6 there's no way to use RTM_GETROUTE in order to look
> for a route as if a packet was received on a specific interface.
> 
> I'd like to modify 'inet6_rtm_getroute()' so that RTA_IIF is interpreted
> in the same way as in IPv4's 'inet_rtm_getroute()'.
> 
> Before I come up with a patch, I'd like to know whether current
> interpretation of RTA_IIF in 'inet6_rtm_getroute()' is deliberate.
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