From: "David S. Miller" <davem@davemloft.net>
To: Hasso Tepper <hasso@estpak.ee>
Cc: netdev@oss.sgi.com
Subject: Re: IPv6 and netlink
Date: Tue, 23 Nov 2004 13:42:57 -0800 [thread overview]
Message-ID: <20041123134257.5c45f5fc.davem@davemloft.net> (raw)
In-Reply-To: <200411232322.50083.hasso@estpak.ee>
On Tue, 23 Nov 2004 23:22:50 +0200
Hasso Tepper <hasso@estpak.ee> wrote:
> While debugging IPv6 RIB in Quagga routing software I discovered some issues
> with kernel rtnetlink messages.
>
> 1) RTM_NEWROUTE message with prefix ff00::/8 (if interface goes up or down)
> is sent with rtm_type set to RTN_UNICAST. It's multicast route, so why not
> RTN_MULTICAST? Is it bug?
What kernel version? I remember fixing this bug.
We should not be emitting rtnetlink messages for
these any more.
> 2) If address is added to the interface, route is created by kernel to route
> prefix to the intarface. In IPv4 these routes have rtm_protocol set to
> RTPROT_KERNEL if announced it via rtnetlink, but that's not the case with
> IPv6. It doesn't matter if address is added by the user or it's the link
> local address (fe80::/64 route). Is it intentional or bug?
>
> 3) Not really rtnetlink related, but if this address is removed from
> interface, route created by kernel (when address was added) isn't removed
> from table. Is it intentional?
I remember fixing these problems too at some point.
In net/ipv6/route.c:rt6_fill_node(), if the RTF_ADDRCONF flag is
set on the route (which is will be set for link-local address
addition routes done by the addrconf layer) then we will set
RTPROT_KERNEL on it.
For every address deleted on an ipv6 interface we invoke
net/ipv6/addrconf.c:ipv6_ifa_notify() with event set to
RTM_DELADDR. That causes ip6_del_rt() to be invoked for
that link-local address's route.
In the end, I think you're just using an ancient kernel
which didn't have these bug fixes added.
next prev parent reply other threads:[~2004-11-23 21:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-23 21:22 IPv6 and netlink Hasso Tepper
2004-11-23 21:42 ` David S. Miller [this message]
2004-11-25 21:13 ` Hasso Tepper
2004-11-26 1:14 ` YOSHIFUJI Hideaki / 吉藤英明
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