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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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rtlplayground.c
+10 -2
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@@ -849,6 +849,8 @@ void handle_rx(void)
rx_packet_vlan |= uip_buf[12 + RTL_TAG_SIZE + 3];
#ifdef RXTXDBG
print_string(" RX-VLAN: "); print_short(rx_packet_vlan); write_char('\n');
print_string(" RX dst: "); print_byte(uip_buf[0]); print_byte(uip_buf[1]); print_byte(uip_buf[2]);
print_byte(uip_buf[3]); print_byte(uip_buf[4]); print_byte(uip_buf[5]); write_char('\n');
#endif
if (stpEnabled && uip_buf[0] == 0x01 && uip_buf[1] == 0x80 && uip_buf[2] == 0xc2 // STP packet?
&& uip_buf[3] == 0x00 && uip_buf[4] == 0x00 && uip_buf[5] == 0x00) {
@@ -857,13 +859,19 @@ void handle_rx(void)
print_string("STP TX\n");
tcpip_output();
}
} else if (uip_buf[0] == 0x01 && uip_buf[1] == 0x00 && uip_buf[2] == 0x5e // IPv4-MC packet?
&& uip_buf[3] == 0x00 && uip_buf[4] == 0x00 && uip_buf[5] == 0x16) {
igmp_packet_handler();
if (uip_len) {
tcpip_output();
}
} else if (uip_buf[ETHERTYPE_OFFSET] == 0x08 && uip_buf[ETHERTYPE_OFFSET + 1] == 0x06) { // ARP?
uip_arp_arpin();
if (uip_len) {
tcpip_output();
}
} else if (uip_buf[ETHERTYPE_OFFSET] == 0x08 && uip_buf[ETHERTYPE_OFFSET + 1] == 0x00) {
uip_arp_ipin();
} else if (uip_buf[ETHERTYPE_OFFSET] == 0x08 && uip_buf[ETHERTYPE_OFFSET + 1] == 0x00) { // TCP?
uip_arp_ipin(); // Learn MAC addresses in TCP packets
uip_input();
if (uip_len) {
// Add ethernet frame