----- Original Message -----
> From: "Linus Lüssing" <linus.luessing@xxxxxx>
> To: "Jan Stancek" <jstancek@xxxxxxxxxx>
> Cc: netdev@xxxxxxxxxxxxxxx, "Florian Westphal" <fwestpha@xxxxxxxxxx>, bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx
> Sent: Tuesday, 4 March, 2014 10:37:57 PM
> Subject: Re: bridge is not forwaring ICMP6 neighbor solicitation to KVM guest
> > I'm not sure if it's Linux (I'm trying to locate that system by MAC), but I
> > see
> > packets like these on my network every ~125 seconds:
> >
> > No. Time Source Destination Protocol
> > Length Info
> > 22675 1334.751135 :: ff02::1 ICMPv6 86
> > Multicast Listener Query
>
> It's probably the bridge on this ancient kernel, you might want to
> backport the following patch:
Hi,
The example above was from box, which turned out not be running Linux.
>
> If these patches on host B xor the sanity check I just submitted applied
> on your host A / VM host fix your issue, then they might be worth
> considering for the stable queue.
Is it necessary to apply same patch also on any (older) kernel running in VM?
I applied your sanity check patch [1] on host A only and I wasn't able to reproduce
this issue any longer when I sent this malformed packet from host B:
Ethernet II, Src: Hewlett-_47:93:1c (00:21:5a:47:93:1c), Dst: IPv6mcast_00:00:00:01 (33:33:00:00:00:01)
Internet Protocol Version 6, Src: 100:0:600:0:78fb:100:: (100:0:600:0:78fb:100::), Dst: ff02::1 (ff02::1)
Internet Control Message Protocol v6
I hand-crafted one new packet from malformed one used in previous tests.
I modified source address from :: to host B link-scope address and changed
dst address from ff02::1 to ff02::1:ffaa:aaaa
Ethernet II, Src: Hewlett-_47:93:1c (00:21:5a:47:93:1c), Dst: IPv6mcast_00:00:00:01 (33:33:00:00:00:01)
Internet Protocol Version 6, Src: fe80::221:5aff:fe47:931c (fe80::221:5aff:fe47:931c), Dst: ff02::1:ffaa:aaaa (ff02::1:ffaa:aaaa)
Internet Control Message Protocol v6
Type: Multicast Listener Query (130)
Code: 0
Checksum: 0xe365 [correct]
Maximum Response Delay [ms]: 1000
Reserved: 0000
Multicast Address: :: (::)
When I sent it from host B, guest on host A hit same issue - it stopped seeing
neighbor solicitation packets. host A was running 3.14.0-rc5 kernel with
patch [1] applied.
Then I updated kernel on guest to 3.14.0-rc5 + patch [1], but result was the same.
Here is trace from guest: http://jan.stancek.eu/tmp/neigh_solicit_and_bridge_traces2/
host B was sending neigh solicit every 5 seconds:
frame 134, 135 -> OK
frame 216, 217 -> OK
frame 329, 330 -> OK
frame 432, 433 -> OK
frame 459 -> new hand-crafted packet
after 35 second mark, guest doesn't see any longer neigh solicit packets
Regards,
Jan
[1] bridge: multicast: add sanity check for query source addresses
