[pulseaudio-tickets] [Bug 44777] module-rtp-send floods the network with UDP packets, crippling it severely

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=44777

--- Comment #22 from Piotr Górski <piotr at prokocim.org> ---
All problems with RTP module flooding network, Wifi are caused by lack of IGMP
support in rtp_send module. 

When pulseaudio with rtp_recv module is started proper IGMPv2 signalling works
like it should:

root at orangepione:~# tshark -i eth0 -Y "igmp"
Capturing on 'eth0'
117 6.950723148 192.168.254.141 -> 239.255.1.56 IGMPv2 46 Membership Report
group 239.255.1.56
177 10.430705605 192.168.254.141 -> 239.255.1.56 IGMPv2 46 Membership Report
group 239.255.1.56
215 13.660683494 192.168.254.141 -> 239.255.1.56 IGMPv2 46 Membership Report
group 239.255.1.56

Pulseaudio creates Multicast group (I don't use default group). As IGMP
signalling is OK - IGMP capable switches enable that multicast group only on
ports that need it. 

If pulseaudio is configured with rtp_send module - there is no IGMP signalling. 

Looking at code of module-rtp-recv.c we can find:

            mr4.imr_multiaddr = ((const struct sockaddr_in*) sa)->sin_addr;
            r = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mr4,
sizeof(mr4));

IP_ADD_MEMBERSHIP tells kernel to join multicast group. 

There is no such command is module-rtp-send.c 

It needs fixing ASAP

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