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Re: [lwip-users] Multicast MAC address filtering

From: address@hidden
Subject: Re: [lwip-users] Multicast MAC address filtering
Date: Tue, 22 Jan 2019 20:13:33 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

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).


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