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net: add helper to generate random mac address

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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>
This commit is contained in:
Michael Walle
2012-06-05 11:33:16 +00:00
committed by Albert ARIBAUD
parent 99e139d590
commit 03c1b04f86
2 changed files with 39 additions and 0 deletions
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17
include/net.h
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@@ -122,6 +122,23 @@ extern int eth_setenv_enetaddr(char *name, const uchar *enetaddr);
extern int eth_getenv_enetaddr_by_index(const char *base_name, int index,
uchar *enetaddr);
#ifdef CONFIG_RANDOM_MACADDR
/*
* The u-boot policy does not allow hardcoded ethernet addresses. Under the
* following circumstances a random generated address is allowed:
* - in emergency cases, where you need a working network connection to set
* the ethernet address.
* Eg. you want a rescue boot and don't have a serial port to access the
* CLI to set environment variables.
*
* In these cases, we generate a random locally administered ethernet address.
*
* Args:
* enetaddr - returns 6 byte hardware address
*/
extern void eth_random_enetaddr(uchar *enetaddr);
#endif
extern int usb_eth_initialize(bd_t *bi);
extern int eth_init(bd_t *bis); /* Initialize the device */
extern int eth_send(void *packet, int length); /* Send a packet */