Thread (4 messages) 4 messages, 2 authors, 2012-04-01

ipv6: RTM_GETROUTE inconsistent interpretation of RTA_IIF

From: Shmulik Ladkani <hidden>
Date: 2012-04-01 06:18:17

(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 [off-list ref] 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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