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Merge pull request #535 from DrDoof/fix/igmp-v2

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igmp: handle IGMPv1/v2 reports and v2 leaves
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logicog authored and GitHub committed 2026-10-04 07:16:52 +02:00
2 parents d80717f3f0 87db2dd4b8
commit 5ab247e996
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.