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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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rtlplayground.c
+20 -2
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@@ -76,10 +76,11 @@ void crc16(__xdata uint8_t *v) __naked;
__xdata uint8_t idle_ready;
__code uint8_t ownIP[] = { 192, 168, 2, 2 };
__code struct uip_eth_addr uip_ethaddr = {{ 0x1c, 0x2a, 0xa3, 0x23, 0x00, 0x02 }};
__code uint8_t gatewayIP[] = { 192, 168, 2, 22};
__code uint8_t netmask[] = { 255, 255, 255, 0};
__xdata struct uip_eth_addr uip_ethaddr;
volatile __xdata uint32_t ticks;
volatile __xdata uint8_t sec_counter;
volatile __xdata uint16_t sleep_ticks;
@@ -1958,11 +1959,28 @@ void bootloader(void)
uip_ipaddr(&uip_hostaddr, ownIP[0], ownIP[1], ownIP[2], ownIP[3]);
uip_ipaddr(&uip_draddr, gatewayIP[0], gatewayIP[1], gatewayIP[2], gatewayIP[3]);
uip_ipaddr(&uip_netmask, netmask[0], netmask[1], netmask[2], netmask[3]);
reg_read_m(RTL837X_REG_CHIP_UUID);
#ifdef DEBUG
print_string("SoC UUID: "); print_sfr_data();
#endif
uip_ethaddr.addr[0] = 0x06; // LAA prefix
uip_ethaddr.addr[3] = sfr_data[0] ^ sfr_data[3];
uip_ethaddr.addr[4] = sfr_data[1] ^ sfr_data[3];
uip_ethaddr.addr[5] = sfr_data[2] ^ sfr_data[3];
reg_read_m(RTL837X_REG_CHIP_LOT_NO);
#ifdef DEBUG
print_string(", LOT: "); print_sfr_data(); write_char(' ');
#endif
uip_ethaddr.addr[1] = sfr_data[0] ^ sfr_data[2];
uip_ethaddr.addr[2] = sfr_data[1] ^ sfr_data[3];
print_string("Setting MAC to: ");
print_byte(uip_ethaddr.addr[0]); write_char(':'); print_byte(uip_ethaddr.addr[1]); write_char(':');
print_byte(uip_ethaddr.addr[2]); write_char(':'); print_byte(uip_ethaddr.addr[3]); write_char(':');
print_byte(uip_ethaddr.addr[4]); write_char(':'); print_byte(uip_ethaddr.addr[5]); write_char('\n');
REG_SET(RTL837X_PIN_MUX_2, 0x0); // Disable pins for ACL
init_smi();
rtl8373_revision();
if (machine_detected.isRTL8373)
rtl8373_init();