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Use the root key in the Security ID EFUSE (when valid) to generate a

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MAC address instead of creating a random one each boot.
This commit is contained in:
Jared McNeill 2016-09-03 15:28:09 +00:00
parent 155d3e43ff
commit 1403e695b7
1 changed files with 15 additions and 3 deletions
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18
sys/arm/allwinner/if_awg.c
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@ -62,6 +62,7 @@ __FBSDID("$FreeBSD$");
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/allwinner/if_awgreg.h>
#include <arm/allwinner/aw_sid.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
@ -1277,6 +1278,7 @@ awg_get_eaddr(device_t dev, uint8_t *eaddr)
{
struct awg_softc *sc;
uint32_t maclo, machi, rnd;
u_char rootkey[16];
sc = device_get_softc(dev);
@ -1285,9 +1287,19 @@ awg_get_eaddr(device_t dev, uint8_t *eaddr)
if (maclo == 0xffffffff && machi == 0xffff) {
/* MAC address in hardware is invalid, create one */
rnd = arc4random();
maclo = 0x00f2 | (rnd & 0xffff0000);
machi = rnd & 0xffff;
if (aw_sid_get_rootkey(rootkey) == 0 &&
(rootkey[3] | rootkey[12] | rootkey[13] | rootkey[14] |
rootkey[15]) != 0) {
/* MAC address is derived from the root key in SID */
maclo = (rootkey[13] << 24) | (rootkey[12] << 16) |
(rootkey[3] << 8) | 0x02;
machi = (rootkey[15] << 8) | rootkey[14];
} else {
/* Create one */
rnd = arc4random();
maclo = 0x00f2 | (rnd & 0xffff0000);
machi = rnd & 0xffff;
}
}
eaddr[0] = maclo & 0xff;