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Use a MAC address based on the SoC's UUID

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We use the SoC's UUID to generate a fixed MAC for a particular
switch device. The MAC generated uses a Realtek prefix and then
is followed by 3 bytes genertaed from the first 3 bytes of the
UUID xored with the last byte in order to prevent being able
to deduce the UUID from the public MAC.
This commit is contained in:
logicog
2026-02-08 15:49:49 +01:00
parent eafe2e96e8
commit ea230615f9
9 changed files with 37 additions and 22 deletions
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rtl837x_stp.c
+4 -4
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@@ -17,7 +17,7 @@
extern __code struct machine machine;
extern __xdata uint8_t sfr_data[4];
extern __code struct uip_eth_addr uip_ethaddr;
extern __xdata struct uip_eth_addr uip_ethaddr;
extern __xdata uint8_t uip_buf[UIP_CONF_BUFFER_SIZE + 2];
@@ -164,9 +164,9 @@ void stp_cnf_send(uint8_t port)
STP_O->bpdu_type = 0x00; // Config
STP_O->flags = 0x81;
memcpyc(STP_O->src_addr, uip_ethaddr.addr, 6);
memcpy(STP_O->src_addr, uip_ethaddr.addr, 6);
memcpy(STP_O->root.mac, root_bridge.mac, 6);
memcpyc(STP_O->bridge.mac, uip_ethaddr.addr, 6);
memcpy(STP_O->bridge.mac, uip_ethaddr.addr, 6);
STP_O->root.prio = root_bridge.prio;
STP_O->root.ext = 0x00;
@@ -221,7 +221,7 @@ void stp_setup(void) __banked
root_bridge.prio = 0x80; // This corresponds to 32768
root_bridge.ext = 0x00;
memcpyc(root_bridge.mac, uip_ethaddr.addr, 6);
memcpy(root_bridge.mac, uip_ethaddr.addr, 6);
}