aboutsummaryrefslogtreecommitdiff
path: root/net
diff options
context:
space:
mode:
authorMichael Walle <michael@walle.cc>2012-06-05 11:33:16 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-07-07 14:07:32 +0200
commit03c1b04f86ddd6a296e2d80d73f5e4670e55da1d (patch)
treeb4d8209cc1b1dee7b0ced4ab179c09b01cc5ab52 /net
parent99e139d5902e488eb779cd4f00c978f3803c39be (diff)
downloadu-boot-linaro-stable-03c1b04f86ddd6a296e2d80d73f5e4670e55da1d.tar.gz
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.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/net/eth.c b/net/eth.c
index d9a643073..d526264fa 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