[lwip-devel] [patch #8724] Add multicast support to loopif

[Joel Cunningham]

Follow-up Comment #2, patch #8724 (project lwip):

The link-up bug was fixed in commit 5b0d9338fd5f2c90e3cbd40970bc11f16631b17c,
before that was fixed, loopif didn't even work for unicast traffic

My products use the loopback interface for same-machine communication that
needs to be available all the time, regardless of the state of the real netifs
(which are WiFi netifs that go up/down frequently during run-time)

This commit just enables multicast to be sent over the loopif and looped back.
 Without enabling NETIF_FLAG_IGMP, looped back multicast messages will be
dropped in ip4_input, where it checks if the input netif has NETIF_FLAG_IGMP
set and that netif has joined the multicast group

Also calls to IP_ADD_MEMBERSHIP fail if the netif doesn't have NETIF_FLAG_IGMP
set

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