The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/atheros/ar71xx_macaddr.c

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    1 /*-
    2  * Copyright (c) 2015, Adrian Chadd <adrian@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: stable/12/sys/mips/atheros/ar71xx_macaddr.c 280798 2015-03-28 23:40:29Z adrian $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/types.h>
   34 #include <sys/libkern.h>
   35 
   36 #include <net/ethernet.h>
   37 
   38 #include <mips/atheros/ar71xx_macaddr.h>
   39 
   40 /*
   41  * Some boards don't have a separate MAC address for each individual
   42  * device on-board, but instead need to derive them from a single MAC
   43  * address stored somewhere.
   44  */
   45 uint8_t ar71xx_board_mac_addr[ETHER_ADDR_LEN];
   46 
   47 /*
   48  * Initialise a MAC address 'dst' from a MAC address 'src'.
   49  *
   50  * 'offset' is added to the low three bytes to allow for sequential
   51  * MAC addresses to be derived from a single one.
   52  *
   53  * 'is_local' is whether this 'dst' should be made a local MAC address.
   54  *
   55  * Returns 0 if it was successfully initialised, -1 on error.
   56  */
   57 int
   58 ar71xx_mac_addr_init(unsigned char *dst, const unsigned char *src,
   59     int offset, int is_local)
   60 {
   61         int t;
   62 
   63         if (dst == NULL || src == NULL)
   64                 return (-1);
   65 
   66         /* XXX TODO: validate 'src' is a valid MAC address */
   67 
   68         t = (((uint32_t) src[3]) << 16)
   69             + (((uint32_t) src[4]) << 8)
   70             + ((uint32_t) src[5]);
   71 
   72         /* Note: this is handles both positive and negative offsets */
   73         t += offset;
   74 
   75         dst[0] = src[0];
   76         dst[1] = src[1];
   77         dst[2] = src[2];
   78         dst[3] = (t >> 16) & 0xff;
   79         dst[4] = (t >> 8) & 0xff;
   80         dst[5] = t & 0xff;
   81 
   82         if (is_local)
   83                 dst[0] |= 0x02;
   84 
   85         /* Everything's okay */
   86         return (0);
   87 }
   88 
   89 /*
   90  * Initialise a random MAC address for use by if_arge.c and whatever
   91  * else requires it.
   92  *
   93  * Returns 0 on success, -1 on error.
   94  */
   95 int
   96 ar71xx_mac_addr_random_init(unsigned char *dst)
   97 {
   98         uint32_t rnd;
   99 
  100         rnd = arc4random();
  101 
  102         dst[0] = 'b';
  103         dst[1] = 's';
  104         dst[2] = 'd';
  105         dst[3] = (rnd >> 24) & 0xff;
  106         dst[4] = (rnd >> 16) & 0xff;
  107         dst[5] = (rnd >> 8) & 0xff;
  108 
  109         return (0);
  110 }

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