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igmp: stop looking up IPv4 multicast in the L2 table on igmp off

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igmp_setup(), which `igmp off` also calls, enabled the lookup of IPv4
multicast in the L2 table. Groups learned while IGMP was on therefore
kept going only to the ports that had reported them, and with reports
no longer trapped nothing updated those entries until a reboot.

The lookup is now enabled in igmp_enable() and disabled in igmp_setup(),
so with IGMP off all IP multicast is flooded again.
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DrDoof committed 2026-10-10 02:43:04 +02:00
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commit 24c0a95734
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doc/igmp.md
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@@ -73,7 +73,8 @@ uint8_t igmp_packet_handler(void) __banked;
void igmp_show(void) __banked;
```c
`igmp_setup()` is called at boot-time and configures flooding of all IP-MC packets by
default, as otherwise no IP-MC would be possible in the network.
default, as otherwise no IP-MC would be possible in the network. `igmp off` calls it as
well; groups learned while IGMP was on stay in the table, but are no longer looked up.
`igmp_enable()`starts IGMP which cause IGMP packets to be handled by the CPU and forwarding
of IP-MC packets to be limited to only subscribed ports.