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