Am 22.01.2019 um 18:36 schrieb Ivan Warren:
Lwip friends,
Is there a way for LWIP to register MAC addresses related to IPV4 or
IPV6 multicast addresses to assist in multicast address filtering by the
MAC (or possibly by upstream switches when supported - without using
IGMP snooping - or whatever is used when MLD is used).
The NIC I use has the capability to filter Multicast Mac addresses
(which can possibly reduce the load). I also have another NIC that is a
virtualization NIC and can inform upstream switch(es) about the filtering.
Without this, a Multicast MAC destination is basically a broadcast ! (Of
course, the filtering is probably done in LWIP at this point anyway).
(Or am I just on a wild goose chase ?)
Struct netif has the 2 callback functions for this: 'igmp_mac_filter'
and 'mld_mac_filter'. These two take IP addreses (each in their matching
version), but since the mapping is defined, that should work for you?
You should use 'netif_set_igmp_mac_filter()' and
'netif_set_mld_mac_filter()' to set these callbacks.
For IPv6, note that the 'mld_mac_filter' callback is not called for the
all-nodes group (if I remember correctly).
Regards,
Simon
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