netdev - Re: Fw: [Bug 203137] New: Bridge does not forward multicast if multicast

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Date:   Wed, 3 Apr 2019 22:57:41 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        roopa@...ulusnetworks.com
Cc:     netdev@...r.kernel.org
Subject: Re: Fw: [Bug 203137] New: Bridge does not forward multicast if
 multicast_querier is enabled

On 03/04/2019 21:53, Stephen Hemminger wrote:
> 
> 
> Begin forwarded message:
> 
> Date: Wed, 03 Apr 2019 04:49:49 +0000
> From: bugzilla-daemon@...zilla.kernel.org
> To: stephen@...workplumber.org
> Subject: [Bug 203137] New: Bridge does not forward multicast if multicast_querier is enabled
> 
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=203137
> 
>             Bug ID: 203137
>            Summary: Bridge does not forward multicast if multicast_querier
>                     is enabled
>            Product: Networking
>            Version: 2.5
>     Kernel Version: 5.0.3
>           Hardware: All
>                 OS: Linux
>               Tree: Fedora
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Other
>           Assignee: stephen@...workplumber.org
>           Reporter: liam.mcbirnie@...ing.com
>         Regression: Yes
> 
> When multicast querier is enabled on a bridge, multicasts are not forwarded
> according to the multicast forwarding database.
> 
> "bridge mdb" shows the multicast forwarding entries but they are not forwarded
> to the ports.
> Manually adding the port to the bridge multicast DB works.
> 
> Wireshark shows the packets arriving on the bridge but not being sent out the
> proper port.
> 
> The regression was introduced by commit
> 19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3, "net: bridge: convert multicast to
> generic rhashtable" by Nikolay Aleksandrov <nikolay@...ulusnetworks.com>.
> 
> Steps to reproduce:
> 
> ip link add br0 type bridge mcast_querier 1
> ip link set br0 up
> 
> ip link add v2 type veth peer name v3
> ip link set v2 master br0
> ip link set v2 up
> ip link set v3 up
> ip addr add 3.0.0.2/24 dev v3
> 
> ip netns add test
> ip link add v1 type veth peer name v1 netns test
> ip link set v1 master br0
> ip link set v1 up
> ip -n test link set v1 up
> ip -n test addr add 3.0.0.1/24 dev v1
> 
> # Multicast receiver
> ip netns exec test socat
> UDP4-RECVFROM:5588,ip-add-membership=224.224.224.224:3.0.0.1,fork -
> 
> # Multicast sender
> echo hello | nc -u -s 3.0.0.2 224.224.224.224 5588
> 
> Observe that 'bridge mdb' has an entry for 224.224.224.224 on port v1.
> Observe that the multicast packets are seen on v2, v3 and br0 but not v1.
> 

I saw the issue, I've missed one memset during the conversion.
Will send a patch after running some tests.

Thanks!