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Add an implementation for IGMP

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This adds an implementation for trapping IGMP packets to the CPU
which will identify IGMPv1/2/3 packets, but handle only v3.
The implementation then inserts/updates/deletes L3 MC entries
in the L3 lookup table. The entries consist of an Ipv4
Destination IP (the IPv4 MC address), a Source IP (0.0.0.0) and
a Portmask. Note that this implementation is not VLAN aware,
as there is no hardware support in the device.

An alternative strategy is to control switching of the L2-MC packets
in which the IPv4-MC packets are transported (dst-MaC is
01:00:5e:xx:yy:zz, with xx:yy:zz corresponding to bits in the Ipv4-MC
address). This will allow to use VLAN-aware packet switching. While
code support is there for table insert/update/deletes, some further
L2 configuration is missing.

There is no support for IPv6 MC, yet.
This commit is contained in:
logicog
2025-12-15 06:54:41 +01:00
parent 96977b5d88
commit c8c524b71f
6 changed files with 310 additions and 36 deletions
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rtl837x_stp.c
+2 -2
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@@ -151,8 +151,8 @@ void stp_cnf_send(uint8_t port)
STP_O->rtl_tag.tag = HTONS(0x8899);
STP_O->rtl_tag.version = 0x04;
STP_O->rtl_tag.dummy = 0x0000;
STP_O->rtl_tag.flag = 0x20; // WHY ???
STP_O->rtl_tag.reason = 0x00;
STP_O->rtl_tag.flags = 0x0020; // Disable L2 learning
STP_O->rtl_tag.pmask = HTONS(((uint16_t)1) << port);
STP_O->msg_len = HTONS(0x27);