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 */
41 static 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 */
52 static 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 */
61 static int tipc_eth_raw2addr(struct tipc_bearer *b,
62 struct tipc_media_addr *addr,
63 char *msg)
64 {
65 char bcast_mac[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
66
67 memset(addr, 0, sizeof(*addr));
68 ether_addr_copy(addr->value, msg);
69 addr->media_id = TIPC_MEDIA_TYPE_ETH;
70 addr->broadcast = !memcmp(addr->value, bcast_mac, ETH_ALEN);
71 return 0;
72 }
73
74 /* Convert discovery msg addr format to Ethernet media addr format */
75 static int tipc_eth_msg2addr(struct tipc_bearer *b,
76 struct tipc_media_addr *addr,
77 char *msg)
78 {
79 /* Skip past preamble: */
80 msg += TIPC_MEDIA_ADDR_OFFSET;
81 return tipc_eth_raw2addr(b, addr, msg);
82 }
83
84 /* Ethernet media registration info */
85 struct tipc_media eth_media_info = {
86 .send_msg = tipc_l2_send_msg,
87 .enable_media = tipc_enable_l2_media,
88 .disable_media = tipc_disable_l2_media,
89 .addr2str = tipc_eth_addr2str,
90 .addr2msg = tipc_eth_addr2msg,
91 .msg2addr = tipc_eth_msg2addr,
92 .raw2addr = tipc_eth_raw2addr,
93 .priority = TIPC_DEF_LINK_PRI,
94 .tolerance = TIPC_DEF_LINK_TOL,
95 .window = TIPC_DEF_LINK_WIN,
96 .type_id = TIPC_MEDIA_TYPE_ETH,
97 .hwaddr_len = ETH_ALEN,
98 .name = "eth"
99 };