netdev - IPv6 PREFSRC behaves different than IPv4 PREFSRC?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20110429080916.GB11260@Chamillionaire.breakpoint.cc>
Date:	Fri, 29 Apr 2011 10:09:16 +0200
From:	Florian Westphal <fw@...len.de>
To:	netdev <netdev@...r.kernel.org>
Cc:	Daniel Walter <sahne@...0.at>
Subject: IPv6 PREFSRC behaves different than IPv4 PREFSRC?

I tested todays net-next and tried to use the new ipv6 prefsrc
patch that went in this month.

But as far as I can say it does not work, or at least
the behaviour I see is unexpected.

Test setup:
eth0 has addresses 192.168.10.100/24 and dead:1::100/64

With IPv4,
I get this behaviour:

$ ip addr add  192.168.10.101 dev eth0
$ ip route get 192.168.10.1
192.168.10.1 dev eth0  src 192.168.10.100
    cache
$ ip route add 192.168.10.1 src 192.168.10.101 dev eth0
$ ip route get 192.168.10.1
192.168.10.1 dev eth0  src 192.168.10.101
     cache
$ ip route get  192.168.10.2
192.168.10.2 dev eth0  src 192.168.10.100
    cache

And that is what I would have expected... But with ipv6 the behaviour
differs:

ipv6
$ ip route get dead:1::1
dead:1::1 via dead:1::1 dev eth0  src dead:1::100  metric 0
    cache
$ ip addr add dead:1::101/64 dev eth0
$ ip route add dead:1::1 src dead:1::101
$ ip route get dead:1::1
dead:1::1 via dead:1::1 dev eth0  src dead:1::101  metric 0
    cache

$ ip route add dead:1::2 src dead:1::100
$ ip route get dead:1::2
dead:1::2 via dead:1::2 dev eth0  src dead:1::101  metric 0

-> src is dead:1:101, and not 100 as I had expected...

This behaviour is rather irritating.
What am I doing wrong?

Thanks,
Florian
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html