diff options
| author | Michael Walle <michael@walle.cc> | 2012-06-05 11:33:16 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-07-07 14:07:32 +0200 |
| commit | 03c1b04f86ddd6a296e2d80d73f5e4670e55da1d (patch) | |
| tree | b4d8209cc1b1dee7b0ced4ab179c09b01cc5ab52 /net | |
| parent | 99e139d5902e488eb779cd4f00c978f3803c39be (diff) | |
net: add helper to generate random mac address
Add new function eth_random_enetaddr() to generate a locally administered
ethernet address.
Signed-off-by: Michael Walle <michael@walle.cc>
Acked-by: Joe Hershberger <joe.hershberger@gmail.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/eth.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/net/eth.c b/net/eth.c index d9a643073d8..d526264fa65 100644 --- a/net/eth.c +++ b/net/eth.c @@ -70,6 +70,28 @@ static int eth_mac_skip(int index) return ((skip_state = getenv(enetvar)) != NULL); } +#ifdef CONFIG_RANDOM_MACADDR +void eth_random_enetaddr(uchar *enetaddr) +{ + uint32_t rval; + + srand(get_timer(0)); + + rval = rand(); + enetaddr[0] = rval & 0xff; + enetaddr[1] = (rval >> 8) & 0xff; + enetaddr[2] = (rval >> 16) & 0xff; + + rval = rand(); + enetaddr[3] = rval & 0xff; + enetaddr[4] = (rval >> 8) & 0xff; + enetaddr[5] = (rval >> 16) & 0xff; + + /* make sure it's local and unicast */ + enetaddr[0] = (enetaddr[0] | 0x02) & ~0x01; +} +#endif + /* * CPU and board-specific Ethernet initializations. Aliased function * signals caller to move on |