netdev - Re: [PATCH net-next] mcast: ensure L-L IPv6 packets are accepted by bridge

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>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <45a527bf8946b52abb939fbdf844c98ac3ee7c0f.camel@vyatta.att-mail.com>
Date:   Thu, 15 Aug 2019 14:36:39 +0100
From:   Patrick Ruddy <pruddy@...tta.att-mail.com>
To:     Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        Linus Lüssing <linus.luessing@...3.blue>
Cc:     bridge@...ts.linux-foundation.org,
        Ido Schimmel <idosch@...sch.org>, netdev@...r.kernel.org,
        roopa@...ulusnetworks.com
Subject: Re: [PATCH net-next] mcast: ensure L-L IPv6 packets are accepted by
 bridge

On Wed, 2019-08-14 at 23:34 +0300, Nikolay Aleksandrov wrote:
> On 8/14/19 11:11 PM, Linus Lüssing wrote:
> > On Wed, Aug 14, 2019 at 05:40:58PM +0100, Patrick Ruddy wrote:
> > > The group is being joined by MLD at the L3 level but the packets are
> > > not being passed up to the l3 interface becasue there is a MLD querier
> > > on the network
> > > 
> > > snippet from /proc/net/igmp6
> > > ...
> > > 40   sw1             ff0200000000000000000001ff008700     1 00000004 0
> > > 40   sw1             ff020000000000000000000000000002     1 00000004 0
> > > 40   sw1             ff020000000000000000000000000001     1 0000000C 0
> > > 40   sw1             ff010000000000000000000000000001     1 00000008 0
> > > 41   lo1             ff020000000000000000000000000001     1 0000000C 0
> > > 41   lo1             ff010000000000000000000000000001     1 00000008 0
> > > 42   sw1.1           ff020000000000000000000000000006     1 00000004 0
> > > 42   sw1.1           ff020000000000000000000000000005     1 00000004 0
> > > 42   sw1.1           ff0200000000000000000001ff000000     2 00000004 0
> > > 42   sw1.1           ff0200000000000000000001ff008700     1 00000004 0
> > > 42   sw1.1           ff0200000000000000000001ff000099     1 00000004 0
> > > 42   sw1.1           ff020000000000000000000000000002     1 00000004 0
> > > 42   sw1.1           ff020000000000000000000000000001     1 0000000C 0
> > > 42   sw1.1           ff010000000000000000000000000001     1 00000008 0
> > > ...
> > > 
> > > the bridge is sw1 and the l3 intervace is sw1.1
> > 
> > What kind of interface is sw1.1 exactly? Is it a VLAN or a VRF
> > interface? Something else?
> > 
> +1
> 
> > Could you also post the output of bridge mdb show?
> > 
> > Regards, Linus
> > 
> > 
> > PS: Also please include the bridge mailinglist in the future.
> > 
> 
> Note that if you'd like to debug a host joined group currently bridge mdb show
> will not dump it and if the group is host-joined only it
> can even be empty. You can use my latest set (not applied yet):
> https://urldefense.proofpoint.com/v2/url?u=http-3A__patchwork.ozlabs.org_project_netdev_list_-3Fseries-3D125169&d=DwIDaQ&c=LFYZ-o9_HUMeMTSQicvjIg&r=au3D9TlUU6OvFpWOU9cuIHeNeV2fw-AOF1ZqCRqsILc&m=KsdarH0MAMMoKZ4PuvHrEC57uEluTGK-XSL4uUxu9MY&s=jyoK6VVmFh1KpKZirrtUYwq9nLy8fz-GigFFLjaLsoE&e=
> 
> Alternatively you could monitor the mdb events, it will show up there even
> today without any changes (bridge monitor mdb) and you can check if it's
> getting deleted.
> 
> Cheers,
>  Nik

The sw1.1 interface is a .1q vlan

The output of "bridge monitor mdb" is empty

I can see the incoming query and the outging report on tshark:
29002 72654.887739 fe80::4041:1ff:fe00:101 → ff02::1      ICMPv6 94
Multicast Listener Query
29003 72655.502035 fe80::eac5:7aff:fe00:8700 → ff02::16     ICMPv6 194
Multicast Listener Report Message v2

debugging shows that bridge code sees the incoming query but not the
outgoing report.

Thanks for all the pointers - I will pursue what is happening.

-pr