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/*-
* Copyright (c) 2015, Adrian Chadd <adrian@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/libkern.h>
#include <net/ethernet.h>
#include <mips/atheros/ar71xx_macaddr.h>
/*
* Some boards don't have a separate MAC address for each individual
* device on-board, but instead need to derive them from a single MAC
* address stored somewhere.
*/
uint8_t ar71xx_board_mac_addr[ETHER_ADDR_LEN];
/*
* Initialise a MAC address 'dst' from a MAC address 'src'.
*
* 'offset' is added to the low three bytes to allow for sequential
* MAC addresses to be derived from a single one.
*
* 'is_local' is whether this 'dst' should be made a local MAC address.
*
* Returns 0 if it was successfully initialised, -1 on error.
*/
int
ar71xx_mac_addr_init(unsigned char *dst, const unsigned char *src,
int offset, int is_local)
{
int t;
if (dst == NULL || src == NULL)
return (-1);
/* XXX TODO: validate 'src' is a valid MAC address */
t = (((uint32_t) src[3]) << 16)
+ (((uint32_t) src[4]) << 8)
+ ((uint32_t) src[5]);
/* Note: this is handles both positive and negative offsets */
t += offset;
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst[3] = (t >> 16) & 0xff;
dst[4] = (t >> 8) & 0xff;
dst[5] = t & 0xff;
if (is_local)
dst[0] |= 0x02;
/* Everything's okay */
return (0);
}
/*
* Initialise a random MAC address for use by if_arge.c and whatever
* else requires it.
*
* Returns 0 on success, -1 on error.
*/
int
ar71xx_mac_addr_random_init(unsigned char *dst)
{
uint32_t rnd;
rnd = arc4random();
dst[0] = 'b';
dst[1] = 's';
dst[2] = 'd';
dst[3] = (rnd >> 24) & 0xff;
dst[4] = (rnd >> 16) & 0xff;
dst[5] = (rnd >> 8) & 0xff;
return (0);
}
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