IGMP proxying setup for tv7

[stapelberg]

Out of curiosity, I figured I’d see what would be necessary to make tv7 work with router7.

Running a statically compiled igmpproxy 0.2.1 via breakglass with the following config:

phyint uplink0 upstream altnet 77.109.129.0/25
phyint lan0 downstream

…results in a working SRF1 stream:

% curl https://api.init7.net/tvchannels.xspf
% vlc udp://@239.77.0.77:5000

With regards to what we’d need to do:

• listen to IGMP packets
• when a client joins an IGMP group, make the router join it
• install a multicast route (see linux/mroute.h for the API) to tell the kernel to forward multicast packets from uplink0 to lan0 for the specific IGMP group
• looks like the mroute API needs to be added to x/sys/unix first

https://haefelfinger.ch/posts/2018/2018-10-31-fiber7-tv7-with-plex-media-server/ looks like it might contain some additional pointers.

This all seems feasible, but since I don’t consume TV, I don’t have a lot of motivation to get this done. Help welcome.