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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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uip/uip_arp.c
+5 -5
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@@ -306,8 +306,8 @@ uip_arp_arpin(void) __banked
BUF_O->opcode = HTONS(2);
memcpy(BUF_O->dhwaddr.addr, BUF->shwaddr.addr, 6);
memcpyc(BUF_O->shwaddr.addr, uip_ethaddr.addr, 6);
memcpyc(BUF_O->ethhdr.src.addr, uip_ethaddr.addr, 6);
memcpy(BUF_O->shwaddr.addr, uip_ethaddr.addr, 6);
memcpy(BUF_O->ethhdr.src.addr, uip_ethaddr.addr, 6);
memcpy(BUF_O->ethhdr.dest.addr, BUF->dhwaddr.addr, 6);
BUF_O->dipaddr[0] = BUF->sipaddr[0];
@@ -399,8 +399,8 @@ uip_arp_out(void) __banked
memset(BUF_O->ethhdr.dest.addr, 0xff, 6);
memset(BUF_O->dhwaddr.addr, 0x00, 6);
memcpyc(BUF_O->ethhdr.src.addr, uip_ethaddr.addr, 6);
memcpyc(BUF_O->shwaddr.addr, uip_ethaddr.addr, 6);
memcpy(BUF_O->ethhdr.src.addr, uip_ethaddr.addr, 6);
memcpy(BUF_O->shwaddr.addr, uip_ethaddr.addr, 6);
uip_ipaddr_copy(BUF_O->dipaddr, ipaddr);
uip_ipaddr_copy(BUF_O->sipaddr, uip_hostaddr);
@@ -420,7 +420,7 @@ uip_arp_out(void) __banked
/* Build an ethernet header. */
memcpy(IPBUF->ethhdr.dest.addr, tabptr->ethaddr.addr, 6);
}
memcpyc(IPBUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
memcpy(IPBUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
IPBUF->ethhdr.type = HTONS(UIP_ETHTYPE_IP);