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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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dhcp.c
+4 -5
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@@ -12,7 +12,6 @@
#include "uip.h"
#include "uip/uip.h"
extern __code struct uip_eth_addr uip_ethaddr;
__xdata struct dhcp_state dhcp_state;
__xdata uip_ipaddr_t server;
@@ -104,7 +103,7 @@ void dhcp_prepare_request(void)
DHCP_P->flags = 0;
// Clear fields client_ip to bootp_file
memset(DHCP_P->client_ip, 0, 224);
memcpyc(DHCP_P->client_addr, uip_ethaddr.addr, 6);
memcpy(DHCP_P->client_addr, uip_ethaddr.addr, 6);
DHCP_P->cookie[0] = 0x63;
DHCP_P->cookie[1] = 0x82;
DHCP_P->cookie[2] = 0x53;
@@ -117,7 +116,7 @@ void dhcp_addopt_client_id(void)
DHCP_OPT[dhcp_state.opt_ptr++] = DHCP_CLIENT_ID;
DHCP_OPT[dhcp_state.opt_ptr++] = DHCP_CLIENT_ID_LEN;
DHCP_OPT[dhcp_state.opt_ptr++] = DHCP_HW_TYPE_ETH;
memcpyc(&DHCP_OPT[dhcp_state.opt_ptr], uip_ethaddr.addr, 6);
memcpy(&DHCP_OPT[dhcp_state.opt_ptr], uip_ethaddr.addr, 6);
dhcp_state.opt_ptr += 6;
}
@@ -130,7 +129,7 @@ void dhcp_addopt_request_ip(void)
DHCP_OPT[dhcp_state.opt_ptr++] = dhcp_state.current_ip[1];
DHCP_OPT[dhcp_state.opt_ptr++] = dhcp_state.current_ip[2];
DHCP_OPT[dhcp_state.opt_ptr++] = dhcp_state.current_ip[3];
memcpyc(&DHCP_OPT[dhcp_state.opt_ptr], uip_ethaddr.addr, 4);
memcpy(&DHCP_OPT[dhcp_state.opt_ptr], uip_ethaddr.addr, 4);
}
@@ -142,7 +141,7 @@ void dhcp_addopt_server_id(void)
DHCP_OPT[dhcp_state.opt_ptr++] = dhcp_state.server[1];
DHCP_OPT[dhcp_state.opt_ptr++] = dhcp_state.server[2];
DHCP_OPT[dhcp_state.opt_ptr++] = dhcp_state.server[3];
memcpyc(&DHCP_OPT[dhcp_state.opt_ptr], uip_ethaddr.addr, 4);
memcpy(&DHCP_OPT[dhcp_state.opt_ptr], uip_ethaddr.addr, 4);
}