/*
   * net/tipc/eth_media.c: Ethernet bearer support for TIPC

   *

   * Copyright (c) 2001-2007, 2013-2014, Ericsson AB

   * Copyright (c) 2005-2008, 2011-2013, Wind River Systems

   * 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, 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.
   * 3. Neither the names of the copyright holders nor the names of its
   *    contributors may be used to endorse or promote products derived from
   *    this software without specific prior written permission.

   *

   * Alternatively, this software may be distributed under the terms of the
   * GNU General Public License ("GPL") version 2 as published by the Free
   * Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 "core.h"
  #include "bearer.h"

  /* Convert Ethernet address (media address format) to string */
  static int tipc_eth_addr2str(struct tipc_media_addr *addr,
  			     char *strbuf, int bufsz)

  {

  	if (bufsz < 18)	/* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */

  		return 1;

  	sprintf(strbuf, "%pM", addr->value);

  	return 0;

  }

  /* Convert from media address format to discovery message addr format */
  static int tipc_eth_addr2msg(char *msg, struct tipc_media_addr *addr)

  {

  	memset(msg, 0, TIPC_MEDIA_INFO_SIZE);

  	msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH;

  	memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, addr->value, ETH_ALEN);

  	return 0;
  }

  /* Convert raw mac address format to media addr format */
  static int tipc_eth_raw2addr(struct tipc_bearer *b,
  			     struct tipc_media_addr *addr,
  			     char *msg)

  {

  	char bcast_mac[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

  	memset(addr, 0, sizeof(*addr));
  	ether_addr_copy(addr->value, msg);
  	addr->media_id = TIPC_MEDIA_TYPE_ETH;
  	addr->broadcast = !memcmp(addr->value, bcast_mac, ETH_ALEN);

  	return 0;
  }

  /* Convert discovery msg addr format to Ethernet media addr format */
  static int tipc_eth_msg2addr(struct tipc_bearer *b,
  			     struct tipc_media_addr *addr,
  			     char *msg)
  {
  	/* Skip past preamble: */

  	msg += TIPC_MEDIA_ADDR_OFFSET;

  	return tipc_eth_raw2addr(b, addr, msg);
  }

  /* Ethernet media registration info */

  struct tipc_media eth_media_info = {

  	.send_msg	= tipc_l2_send_msg,
  	.enable_media	= tipc_enable_l2_media,
  	.disable_media	= tipc_disable_l2_media,
  	.addr2str	= tipc_eth_addr2str,
  	.addr2msg	= tipc_eth_addr2msg,
  	.msg2addr	= tipc_eth_msg2addr,

  	.raw2addr	= tipc_eth_raw2addr,

  	.priority	= TIPC_DEF_LINK_PRI,
  	.tolerance	= TIPC_DEF_LINK_TOL,
  	.window		= TIPC_DEF_LINK_WIN,
  	.type_id	= TIPC_MEDIA_TYPE_ETH,

  	.hwaddr_len	= ETH_ALEN,

  	.name		= "eth"
  };