netdev - kernel never returns rtm_protocol of RTPROT

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Date:	Tue, 13 Apr 2010 19:04:54 -0700
From:	Jeff Haran <jharan@...cade.COM>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: kernel never returns rtm_protocol of RTPROT_RA?

Hi,

Perhaps I am misreading the kernel sources, but it looks to me like an IPv6 default gateway that is discovered via the receipt of the Router Advertisement will not be reported in a netlink RTM_NEWROUTE message with the rtm_protocol field == RTPROT_RA, though that seems to be the defined purpose for RTPROT_RA. It seems like such addresses are going to be reported with rtm_protocol == RTPROT_KERNEL.

This is what I observe reading the sources to our old kernel (2.6.14) and actually running the data through it, and later sources seem to be doing the same thing though I haven't studied them as closely.

Is this the expected behavior?

Does anybody see any problems if I change rt6_fill_node() to put RTPROT_RA into rtm_protocol when rt6i_flags has both the RTF_ADDRCONF and RTF_DEFAULT bits set?

I am writing an application that distinguishes different sources of IPv6 routes and would like be able to count on RTPROT_RA meaning the default router address originated from a Router Advertisements.

Please include my email address in response as I do not subscribe to this list.

Thanks,

Jeff Haran
Brocade

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