Hi!
On 9/3/16, Jared McNeill <jmcne...@freebsd.org> wrote:
> Author: jmcneill
> Date: Sat Sep 3 15:28:09 2016
> New Revision: 305354
> URL: https://svnweb.freebsd.org/changeset/base/305354
>
> Log:
> Use the root key in the Security ID EFUSE (when valid) to generate a
> MAC address instead of creating a random one each boot.
Could you please describe a little more about this root key? What is
it? What's the main purpose? Is is a crypto root key?
>
> Modified:
> head/sys/arm/allwinner/if_awg.c
>
> Modified: head/sys/arm/allwinner/if_awg.c
> ==============================================================================
> --- head/sys/arm/allwinner/if_awg.c Sat Sep 3 15:26:28 2016
> (r305353)
> +++ head/sys/arm/allwinner/if_awg.c Sat Sep 3 15:28:09 2016
> (r305354)
> @@ -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 *ead
> {
> 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 *ead
>
> 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;
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