gnrc ipv6: multicast packets are not dispatched to the upper layers

[OlegHahm]

If I understand the forwarding in gnrc_ipv6 correctly multicast packets with a broader scope than link-local (e.g. global ones) are forwarded correctly, but are not passed to any upper layer. I would assume that upon reception of a multicast packet targeted for a global multicast address, the packet would be dispatched to the upper layers and forwarded.

[miri64]

Huh, isn't gnrc_ipc6_demux() called for the multicast case?

[OlegHahm]

If I see it correctly the function returns after the forwarding.

[miri64]

Please rephrase...

[OlegHahm]

The _receive() function of gnrc_ipv6.c returns after forwarding a packet in https://github.com/RIOT-OS/RIOT/blob/master/sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c#L912. Hence the demux call below will never be reached for this case.

[miri64]

Ah sorry, I thought #4528 (which fixes that) was already merged...

[haukepetersen]

the fix (#4528) is set for 2016.07, so I do the same with this issue.

[kYc0o]

Do you know if this issue is still present?

[kYc0o]

Postponing again since the fix was postponed too.