Add IGMP protocols to cli tool

[Leon]

Would it be possible to add ICMP & IGMP to the protocols ufw can use? There are ways around it and it isn't needed often but it can be handy and it would be nice for completeness' sake.

[Pali (pali)]

Allowing igmp packets is needed for configuring correct multicast support

[Scott Bertilson (ssb-v)]

This seems to be a trivial change at least as far as igmp is concerned:
--- /usr/lib/python3/dist-packages/ufw/common.py.orig 2014-02-28 15:50:59.000000000 -0600
+++ /usr/lib/python3/dist-packages/ufw/common.py 2015-01-13 11:38:45.249090960 -0600
@@ -246,6 +246,7 @@
            protocol == "ipv6" or \
            protocol == "esp" or \
            protocol == "ah" or \
+ protocol == "igmp" or \
            protocol == "any":
             self.protocol = protocol
         else:

This would be very helpful since it allows one to enable IPv4 multicast using the CLI alone.

I hesitate to suggest that icmp is as simple because there are built-in rules which may need to be taken into account.

[Jamie Strandboge (jdstrand)]

It isn't quite as easy as comment #2-- for example, igmp should only be used with ipv4 addresses, you shouldn't specify a port and there needs to be test cases. However, I've added preliminary support for igmp just now. icmp is a whole other thing and may be addressed at a future date.