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igmp: handle IGMPv1/v2 reports and v2 leaves

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Only frames to 01:00:5e:00:00:16 reached the IGMP handler, so v1/v2
reports, which go to the group address, were never seen. The handler
also took the group from the first v3 group record for every type.

Pass all IPv4 multicast to the handler, which takes the IGMP header
from the IP header length, the group from the IGMP header for v1/v2
reports and v2 leaves and from the first group record for v3, and
returns 0 for anything that is not IGMP so it goes on to the IP stack.
The message and record types have names now.
This commit is contained in:
DrDoof committed 2026-10-01 20:42:22 +02:00
1 parent f0aea3dcac
commit 87db2dd4b8
4 files changed
+60 -23
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doc/igmp.md
+6 -2
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@@ -69,7 +69,7 @@ The code currently provides the following functions:
void igmp_setup(void) __banked;
void igmp_enable(void) __banked;
void igmp_router_port_set(uint16_t pmask) __banked;
void igmp_packet_handler(void) __banked;
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
@@ -80,7 +80,11 @@ of IP-MC packets to be limited to only subscribed ports.
`igmp_router_port_set()`configures forwarding ports for IGMP messages.
`igmp_packet_handler()` implements handling of trapped IGMP packets by the CPU.
`igmp_packet_handler()` implements handling of trapped IGMP packets by the CPU. It is called
for frames to 01:00:5e:xx:xx:xx and returns 0 when the frame is not a trapped IGMP packet,
so that it is passed on to the IP stack. IGMPv1/v2 reports (0x12, 0x16) join the group given
in the IGMP header, IGMPv2 leaves (0x17) leave it, IGMPv3 reports use the first group record
(type 4 joins, type 3 leaves). Trapped IGMP frames arrive without a VLAN tag.
`igmp_show()` prints out the IGMP configuration on the CLI.