[Bluez-users] Multicast over BNET

[Bluez-users] Multicast over BNET

[Álvaro Lopes]

Hello list

I'm having a problem with multicast filters. When BNEP multicast
filters are activated in the kernel (2.6.11, also in others) I cannot
send multicast packets over the interface.

If I do a "tcpdump -i bnep0" the packets I am sending (to 224.0.0.133)
show up, but they aren't actually sent over the "air" (in fact, a
hcidump shows no activity).

I've set up a route for the interface (eg, route add -net 224.0.0.0
netmask 240.0.0.0 dev bnep0).

I am not a member of that group. Even if I join the MC group (using
only setsockopt, not using SIOCADDMULTI ioctl), it still doesn't
transmit the packets.

If I disable the multicast filters, all goes OK. The packets are
really sent and received by my peer.

The box receives all multicast traffic OK, just those packets I wish
to send do not reach my peer.

My question: Is there a way (simple) to get around this w/o
recompiling the kernel? I also have another problem because the
application we're using is Java(tm) based...

Thanks in advance for any pointers/help on this.

=C1lvaro Lopes


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Re: [Bluez-users] Multicast over BNET

[Marcel Holtmann]

Hi Alvaro,

> I'm having a problem with multicast filters. When BNEP multicast
> filters are activated in the kernel (2.6.11, also in others) I cannot
> send multicast packets over the interface.
> 
> If I do a "tcpdump -i bnep0" the packets I am sending (to 224.0.0.133)
> show up, but they aren't actually sent over the "air" (in fact, a
> hcidump shows no activity).
> 
> I've set up a route for the interface (eg, route add -net 224.0.0.0
> netmask 240.0.0.0 dev bnep0).
> 
> I am not a member of that group. Even if I join the MC group (using
> only setsockopt, not using SIOCADDMULTI ioctl), it still doesn't
> transmit the packets.
> 
> If I disable the multicast filters, all goes OK. The packets are
> really sent and received by my peer.
> 
> The box receives all multicast traffic OK, just those packets I wish
> to send do not reach my peer.
> 
> My question: Is there a way (simple) to get around this w/o
> recompiling the kernel? I also have another problem because the
> application we're using is Java(tm) based...
> 
> Thanks in advance for any pointers/help on this.

I never used multicast and actually I have no idea what is going wrong
there. Hopefully someone is debugging it and send in a patch to fix it.
Another alternate option can be to make the multicast and protocol
filter options a module parameter. Both patches are welcome, but until
then there is no other chance the recompiling the kernel, I think.

Regards

Marcel




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