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/* Convert Ethernet address (media address format) to string */
41static int tipc_eth_addr2str(struct tipc_media_addr *addr,
42			     char *strbuf, int bufsz)
43{
44	if (bufsz < 18)	/* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */
45		return 1;
46
47	sprintf(strbuf, "%pM", addr->value);
48	return 0;
49}
50
51/* Convert from media address format to discovery message addr format */
52static int tipc_eth_addr2msg(char *msg, struct tipc_media_addr *addr)
53{
54	memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
55	msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH;
56	memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, addr->value, ETH_ALEN);
57	return 0;
58}
59
60/* Convert raw mac address format to media addr format */
61static int tipc_eth_raw2addr(struct tipc_bearer *b,
62			     struct tipc_media_addr *addr,
63			     const char *msg)
64{
65	memset(addr, 0, sizeof(*addr));
66	ether_addr_copy(addr->value, msg);
67	addr->media_id = TIPC_MEDIA_TYPE_ETH;
68	addr->broadcast = is_broadcast_ether_addr(addr->value);
69	return 0;
70}
71
72/* Convert discovery msg addr format to Ethernet media addr format */
73static int tipc_eth_msg2addr(struct tipc_bearer *b,
74			     struct tipc_media_addr *addr,
75			     char *msg)
76{
77	/* Skip past preamble: */
78	msg += TIPC_MEDIA_ADDR_OFFSET;
79	return tipc_eth_raw2addr(b, addr, msg);
80}
81
82/* Ethernet media registration info */
83struct tipc_media eth_media_info = {
84	.send_msg	= tipc_l2_send_msg,
85	.enable_media	= tipc_enable_l2_media,
86	.disable_media	= tipc_disable_l2_media,
87	.addr2str	= tipc_eth_addr2str,
88	.addr2msg	= tipc_eth_addr2msg,
89	.msg2addr	= tipc_eth_msg2addr,
90	.raw2addr	= tipc_eth_raw2addr,
91	.priority	= TIPC_DEF_LINK_PRI,
92	.tolerance	= TIPC_DEF_LINK_TOL,
93	.min_win	= TIPC_DEF_LINK_WIN,
94	.max_win	= TIPC_MAX_LINK_WIN,
95	.type_id	= TIPC_MEDIA_TYPE_ETH,
96	.hwaddr_len	= ETH_ALEN,
97	.name		= "eth"
98};
99