LXR linux/net/tipc/eth

   1/*
   2 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
   3 *
   4 * Copyright (c) 2001-2007, 2013-2014, Ericsson AB
   5 * Copyright (c) 2005-2008, 2011-2013, Wind River Systems
   6 * All rights reserved.
   7 *
   8 * Redistribution and use in source and binary forms, with or without
   9 * modification, are permitted provided that the following conditions are met:
  10 *
  11 * 1. Redistributions of source code must retain the above copyright
  12 *    notice, this list of conditions and the following disclaimer.
  13 * 2. Redistributions in binary form must reproduce the above copyright
  14 *    notice, this list of conditions and the following disclaimer in the
  15 *    documentation and/or other materials provided with the distribution.
  16 * 3. Neither the names of the copyright holders nor the names of its
  17 *    contributors may be used to endorse or promote products derived from
  18 *    this software without specific prior written permission.
  19 *
  20 * Alternatively, this software may be distributed under the terms of the
  21 * GNU General Public License ("GPL") version 2 as published by the Free
  22 * Software Foundation.
  23 *
  24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34 * POSSIBILITY OF SUCH DAMAGE.
  35 */
  36
  37#include "core.h"
  38#include "bearer.h"
  39
  40#define ETH_ADDR_OFFSET  4  /* MAC addr position inside address field */
  41
  42/* Convert Ethernet address (media address format) to string */
  43static int tipc_eth_addr2str(struct tipc_media_addr *addr,
  44                             char *strbuf, int bufsz)
  45{
  46        if (bufsz < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */
  47                return 1;
  48
  49        sprintf(strbuf, "%pM", addr->value);
  50        return 0;
  51}
  52
  53/* Convert from media address format to discovery message addr format */
  54static int tipc_eth_addr2msg(char *msg, struct tipc_media_addr *addr)
  55{
  56        memset(msg, 0, TIPC_MEDIA_ADDR_SIZE);
  57        msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH;
  58        memcpy(msg + ETH_ADDR_OFFSET, addr->value, ETH_ALEN);
  59        return 0;
  60}
  61
  62/* Convert raw mac address format to media addr format */
  63static int tipc_eth_raw2addr(struct tipc_bearer *b,
  64                             struct tipc_media_addr *addr,
  65                             char *msg)
  66{
  67        char bcast_mac[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  68
  69        memset(addr, 0, sizeof(*addr));
  70        ether_addr_copy(addr->value, msg);
  71        addr->media_id = TIPC_MEDIA_TYPE_ETH;
  72        addr->broadcast = !memcmp(addr->value, bcast_mac, ETH_ALEN);
  73        return 0;
  74}
  75
  76/* Convert discovery msg addr format to Ethernet media addr format */
  77static int tipc_eth_msg2addr(struct tipc_bearer *b,
  78                             struct tipc_media_addr *addr,
  79                             char *msg)
  80{
  81        /* Skip past preamble: */
  82        msg += ETH_ADDR_OFFSET;
  83        return tipc_eth_raw2addr(b, addr, msg);
  84}
  85
  86/* Ethernet media registration info */
  87struct tipc_media eth_media_info = {
  88        .send_msg       = tipc_l2_send_msg,
  89        .enable_media   = tipc_enable_l2_media,
  90        .disable_media  = tipc_disable_l2_media,
  91        .addr2str       = tipc_eth_addr2str,
  92        .addr2msg       = tipc_eth_addr2msg,
  93        .msg2addr       = tipc_eth_msg2addr,
  94        .raw2addr       = tipc_eth_raw2addr,
  95        .priority       = TIPC_DEF_LINK_PRI,
  96        .tolerance      = TIPC_DEF_LINK_TOL,
  97        .window         = TIPC_DEF_LINK_WIN,
  98        .type_id        = TIPC_MEDIA_TYPE_ETH,
  99        .hwaddr_len     = ETH_ALEN,
 100        .name           = "eth"
 101};
 102