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 */
tipc_eth_addr2str(struct tipc_media_addr * addr,char * strbuf,int bufsz)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 */
tipc_eth_addr2msg(char * msg,struct tipc_media_addr * addr)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 */
tipc_eth_raw2addr(struct tipc_bearer * b,struct tipc_media_addr * addr,const char * msg)61 static 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 */
tipc_eth_msg2addr(struct tipc_bearer * b,struct tipc_media_addr * addr,char * msg)73 static 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 */
83 struct 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