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1/*
2 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
3 *
4 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2005-2007, 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 MAX_ETH_BEARERS 2
41#define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
42#define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
43#define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
44
45/**
46 * struct eth_bearer - Ethernet bearer data structure
47 * @bearer: ptr to associated "generic" bearer structure
48 * @dev: ptr to associated Ethernet network device
49 * @tipc_packet_type: used in binding TIPC to Ethernet driver
50 */
51
52struct eth_bearer {
53 struct tipc_bearer *bearer;
54 struct net_device *dev;
55 struct packet_type tipc_packet_type;
56};
57
58static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
59static int eth_started;
60static struct notifier_block notifier;
61
62/**
63 * send_msg - send a TIPC message out over an Ethernet interface
64 */
65
66static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
67 struct tipc_media_addr *dest)
68{
69 struct sk_buff *clone;
70 struct net_device *dev;
71 int delta;
72
73 clone = skb_clone(buf, GFP_ATOMIC);
74 if (!clone)
75 return 0;
76
77 dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
78 delta = dev->hard_header_len - skb_headroom(buf);
79
80 if ((delta > 0) &&
81 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
82 kfree_skb(clone);
83 return 0;
84 }
85
86 skb_reset_network_header(clone);
87 clone->dev = dev;
88 dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr,
89 dev->dev_addr, clone->len);
90 dev_queue_xmit(clone);
91 return 0;
92}
93
94/**
95 * recv_msg - handle incoming TIPC message from an Ethernet interface
96 *
97 * Accept only packets explicitly sent to this node, or broadcast packets;
98 * ignores packets sent using Ethernet multicast, and traffic sent to other
99 * nodes (which can happen if interface is running in promiscuous mode).
100 */
101
102static int recv_msg(struct sk_buff *buf, struct net_device *dev,
103 struct packet_type *pt, struct net_device *orig_dev)
104{
105 struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
106
107 if (!net_eq(dev_net(dev), &init_net)) {
108 kfree_skb(buf);
109 return 0;
110 }
111
112 if (likely(eb_ptr->bearer)) {
113 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
114 buf->next = NULL;
115 tipc_recv_msg(buf, eb_ptr->bearer);
116 return 0;
117 }
118 }
119 kfree_skb(buf);
120 return 0;
121}
122
123/**
124 * enable_bearer - attach TIPC bearer to an Ethernet interface
125 */
126
127static int enable_bearer(struct tipc_bearer *tb_ptr)
128{
129 struct net_device *dev = NULL;
130 struct net_device *pdev = NULL;
131 struct eth_bearer *eb_ptr = ð_bearers[0];
132 struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
133 char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
134 int pending_dev = 0;
135
136 /* Find unused Ethernet bearer structure */
137
138 while (eb_ptr->dev) {
139 if (!eb_ptr->bearer)
140 pending_dev++;
141 if (++eb_ptr == stop)
142 return pending_dev ? -EAGAIN : -EDQUOT;
143 }
144
145 /* Find device with specified name */
146
147 for_each_netdev(&init_net, pdev) {
148 if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
149 dev = pdev;
150 break;
151 }
152 }
153 if (!dev)
154 return -ENODEV;
155
156 /* Find Ethernet bearer for device (or create one) */
157
158 while ((eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev))
159 eb_ptr++;
160 if (eb_ptr == stop)
161 return -EDQUOT;
162 if (!eb_ptr->dev) {
163 eb_ptr->dev = dev;
164 eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
165 eb_ptr->tipc_packet_type.dev = dev;
166 eb_ptr->tipc_packet_type.func = recv_msg;
167 eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
168 INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
169 dev_hold(dev);
170 dev_add_pack(&eb_ptr->tipc_packet_type);
171 }
172
173 /* Associate TIPC bearer with Ethernet bearer */
174
175 eb_ptr->bearer = tb_ptr;
176 tb_ptr->usr_handle = (void *)eb_ptr;
177 tb_ptr->mtu = dev->mtu;
178 tb_ptr->blocked = 0;
179 tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
180 memcpy(&tb_ptr->addr.dev_addr, dev->dev_addr, ETH_ALEN);
181 return 0;
182}
183
184/**
185 * disable_bearer - detach TIPC bearer from an Ethernet interface
186 *
187 * We really should do dev_remove_pack() here, but this function can not be
188 * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
189 * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
190 */
191
192static void disable_bearer(struct tipc_bearer *tb_ptr)
193{
194 ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
195}
196
197/**
198 * recv_notification - handle device updates from OS
199 *
200 * Change the state of the Ethernet bearer (if any) associated with the
201 * specified device.
202 */
203
204static int recv_notification(struct notifier_block *nb, unsigned long evt,
205 void *dv)
206{
207 struct net_device *dev = (struct net_device *)dv;
208 struct eth_bearer *eb_ptr = ð_bearers[0];
209 struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
210
211 if (!net_eq(dev_net(dev), &init_net))
212 return NOTIFY_DONE;
213
214 while ((eb_ptr->dev != dev)) {
215 if (++eb_ptr == stop)
216 return NOTIFY_DONE; /* couldn't find device */
217 }
218 if (!eb_ptr->bearer)
219 return NOTIFY_DONE; /* bearer had been disabled */
220
221 eb_ptr->bearer->mtu = dev->mtu;
222
223 switch (evt) {
224 case NETDEV_CHANGE:
225 if (netif_carrier_ok(dev))
226 tipc_continue(eb_ptr->bearer);
227 else
228 tipc_block_bearer(eb_ptr->bearer->name);
229 break;
230 case NETDEV_UP:
231 tipc_continue(eb_ptr->bearer);
232 break;
233 case NETDEV_DOWN:
234 tipc_block_bearer(eb_ptr->bearer->name);
235 break;
236 case NETDEV_CHANGEMTU:
237 case NETDEV_CHANGEADDR:
238 tipc_block_bearer(eb_ptr->bearer->name);
239 tipc_continue(eb_ptr->bearer);
240 break;
241 case NETDEV_UNREGISTER:
242 case NETDEV_CHANGENAME:
243 tipc_disable_bearer(eb_ptr->bearer->name);
244 break;
245 }
246 return NOTIFY_OK;
247}
248
249/**
250 * eth_addr2str - convert Ethernet address to string
251 */
252
253static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
254{
255 unchar *addr = (unchar *)&a->dev_addr;
256
257 if (str_size < 18)
258 *str_buf = '\0';
259 else
260 sprintf(str_buf, "%pM", addr);
261 return str_buf;
262}
263
264/**
265 * tipc_eth_media_start - activate Ethernet bearer support
266 *
267 * Register Ethernet media type with TIPC bearer code. Also register
268 * with OS for notifications about device state changes.
269 */
270
271int tipc_eth_media_start(void)
272{
273 struct tipc_media_addr bcast_addr;
274 int res;
275
276 if (eth_started)
277 return -EINVAL;
278
279 bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
280 memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN);
281
282 memset(eth_bearers, 0, sizeof(eth_bearers));
283
284 res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
285 enable_bearer, disable_bearer, send_msg,
286 eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
287 ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
288 if (res)
289 return res;
290
291 notifier.notifier_call = &recv_notification;
292 notifier.priority = 0;
293 res = register_netdevice_notifier(¬ifier);
294 if (!res)
295 eth_started = 1;
296 return res;
297}
298
299/**
300 * tipc_eth_media_stop - deactivate Ethernet bearer support
301 */
302
303void tipc_eth_media_stop(void)
304{
305 int i;
306
307 if (!eth_started)
308 return;
309
310 unregister_netdevice_notifier(¬ifier);
311 for (i = 0; i < MAX_ETH_BEARERS ; i++) {
312 if (eth_bearers[i].bearer) {
313 eth_bearers[i].bearer->blocked = 1;
314 eth_bearers[i].bearer = NULL;
315 }
316 if (eth_bearers[i].dev) {
317 dev_remove_pack(ð_bearers[i].tipc_packet_type);
318 dev_put(eth_bearers[i].dev);
319 }
320 }
321 memset(ð_bearers, 0, sizeof(eth_bearers));
322 eth_started = 0;
323}
1/*
2 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
3 *
4 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2005-2008, 2011, 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 MAX_ETH_BEARERS MAX_BEARERS
41
42#define ETH_ADDR_OFFSET 4 /* message header offset of MAC address */
43
44/**
45 * struct eth_bearer - Ethernet bearer data structure
46 * @bearer: ptr to associated "generic" bearer structure
47 * @dev: ptr to associated Ethernet network device
48 * @tipc_packet_type: used in binding TIPC to Ethernet driver
49 * @cleanup: work item used when disabling bearer
50 */
51struct eth_bearer {
52 struct tipc_bearer *bearer;
53 struct net_device *dev;
54 struct packet_type tipc_packet_type;
55 struct work_struct cleanup;
56};
57
58static struct tipc_media eth_media_info;
59static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
60static int eth_started;
61static struct notifier_block notifier;
62
63/**
64 * eth_media_addr_set - initialize Ethernet media address structure
65 *
66 * Media-dependent "value" field stores MAC address in first 6 bytes
67 * and zeroes out the remaining bytes.
68 */
69static void eth_media_addr_set(struct tipc_media_addr *a, char *mac)
70{
71 memcpy(a->value, mac, ETH_ALEN);
72 memset(a->value + ETH_ALEN, 0, sizeof(a->value) - ETH_ALEN);
73 a->media_id = TIPC_MEDIA_TYPE_ETH;
74 a->broadcast = !memcmp(mac, eth_media_info.bcast_addr.value, ETH_ALEN);
75}
76
77/**
78 * send_msg - send a TIPC message out over an Ethernet interface
79 */
80static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
81 struct tipc_media_addr *dest)
82{
83 struct sk_buff *clone;
84 struct net_device *dev;
85 int delta;
86
87 clone = skb_clone(buf, GFP_ATOMIC);
88 if (!clone)
89 return 0;
90
91 dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
92 delta = dev->hard_header_len - skb_headroom(buf);
93
94 if ((delta > 0) &&
95 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
96 kfree_skb(clone);
97 return 0;
98 }
99
100 skb_reset_network_header(clone);
101 clone->dev = dev;
102 dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
103 dev->dev_addr, clone->len);
104 dev_queue_xmit(clone);
105 return 0;
106}
107
108/**
109 * recv_msg - handle incoming TIPC message from an Ethernet interface
110 *
111 * Accept only packets explicitly sent to this node, or broadcast packets;
112 * ignores packets sent using Ethernet multicast, and traffic sent to other
113 * nodes (which can happen if interface is running in promiscuous mode).
114 */
115static int recv_msg(struct sk_buff *buf, struct net_device *dev,
116 struct packet_type *pt, struct net_device *orig_dev)
117{
118 struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
119
120 if (!net_eq(dev_net(dev), &init_net)) {
121 kfree_skb(buf);
122 return 0;
123 }
124
125 if (likely(eb_ptr->bearer)) {
126 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
127 buf->next = NULL;
128 tipc_recv_msg(buf, eb_ptr->bearer);
129 return 0;
130 }
131 }
132 kfree_skb(buf);
133 return 0;
134}
135
136/**
137 * enable_bearer - attach TIPC bearer to an Ethernet interface
138 */
139static int enable_bearer(struct tipc_bearer *tb_ptr)
140{
141 struct net_device *dev = NULL;
142 struct net_device *pdev = NULL;
143 struct eth_bearer *eb_ptr = ð_bearers[0];
144 struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
145 char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
146 int pending_dev = 0;
147
148 /* Find unused Ethernet bearer structure */
149 while (eb_ptr->dev) {
150 if (!eb_ptr->bearer)
151 pending_dev++;
152 if (++eb_ptr == stop)
153 return pending_dev ? -EAGAIN : -EDQUOT;
154 }
155
156 /* Find device with specified name */
157 read_lock(&dev_base_lock);
158 for_each_netdev(&init_net, pdev) {
159 if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
160 dev = pdev;
161 dev_hold(dev);
162 break;
163 }
164 }
165 read_unlock(&dev_base_lock);
166 if (!dev)
167 return -ENODEV;
168
169 /* Create Ethernet bearer for device */
170 eb_ptr->dev = dev;
171 eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
172 eb_ptr->tipc_packet_type.dev = dev;
173 eb_ptr->tipc_packet_type.func = recv_msg;
174 eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
175 INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
176 dev_add_pack(&eb_ptr->tipc_packet_type);
177
178 /* Associate TIPC bearer with Ethernet bearer */
179 eb_ptr->bearer = tb_ptr;
180 tb_ptr->usr_handle = (void *)eb_ptr;
181 tb_ptr->mtu = dev->mtu;
182 tb_ptr->blocked = 0;
183 eth_media_addr_set(&tb_ptr->addr, (char *)dev->dev_addr);
184 return 0;
185}
186
187/**
188 * cleanup_bearer - break association between Ethernet bearer and interface
189 *
190 * This routine must be invoked from a work queue because it can sleep.
191 */
192static void cleanup_bearer(struct work_struct *work)
193{
194 struct eth_bearer *eb_ptr =
195 container_of(work, struct eth_bearer, cleanup);
196
197 dev_remove_pack(&eb_ptr->tipc_packet_type);
198 dev_put(eb_ptr->dev);
199 eb_ptr->dev = NULL;
200}
201
202/**
203 * disable_bearer - detach TIPC bearer from an Ethernet interface
204 *
205 * Mark Ethernet bearer as inactive so that incoming buffers are thrown away,
206 * then get worker thread to complete bearer cleanup. (Can't do cleanup
207 * here because cleanup code needs to sleep and caller holds spinlocks.)
208 */
209static void disable_bearer(struct tipc_bearer *tb_ptr)
210{
211 struct eth_bearer *eb_ptr = (struct eth_bearer *)tb_ptr->usr_handle;
212
213 eb_ptr->bearer = NULL;
214 INIT_WORK(&eb_ptr->cleanup, cleanup_bearer);
215 schedule_work(&eb_ptr->cleanup);
216}
217
218/**
219 * recv_notification - handle device updates from OS
220 *
221 * Change the state of the Ethernet bearer (if any) associated with the
222 * specified device.
223 */
224static int recv_notification(struct notifier_block *nb, unsigned long evt,
225 void *dv)
226{
227 struct net_device *dev = (struct net_device *)dv;
228 struct eth_bearer *eb_ptr = ð_bearers[0];
229 struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
230
231 if (!net_eq(dev_net(dev), &init_net))
232 return NOTIFY_DONE;
233
234 while ((eb_ptr->dev != dev)) {
235 if (++eb_ptr == stop)
236 return NOTIFY_DONE; /* couldn't find device */
237 }
238 if (!eb_ptr->bearer)
239 return NOTIFY_DONE; /* bearer had been disabled */
240
241 eb_ptr->bearer->mtu = dev->mtu;
242
243 switch (evt) {
244 case NETDEV_CHANGE:
245 if (netif_carrier_ok(dev))
246 tipc_continue(eb_ptr->bearer);
247 else
248 tipc_block_bearer(eb_ptr->bearer->name);
249 break;
250 case NETDEV_UP:
251 tipc_continue(eb_ptr->bearer);
252 break;
253 case NETDEV_DOWN:
254 tipc_block_bearer(eb_ptr->bearer->name);
255 break;
256 case NETDEV_CHANGEMTU:
257 case NETDEV_CHANGEADDR:
258 tipc_block_bearer(eb_ptr->bearer->name);
259 tipc_continue(eb_ptr->bearer);
260 break;
261 case NETDEV_UNREGISTER:
262 case NETDEV_CHANGENAME:
263 tipc_disable_bearer(eb_ptr->bearer->name);
264 break;
265 }
266 return NOTIFY_OK;
267}
268
269/**
270 * eth_addr2str - convert Ethernet address to string
271 */
272static int eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
273{
274 if (str_size < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */
275 return 1;
276
277 sprintf(str_buf, "%pM", a->value);
278 return 0;
279}
280
281/**
282 * eth_str2addr - convert string to Ethernet address
283 */
284static int eth_str2addr(struct tipc_media_addr *a, char *str_buf)
285{
286 char mac[ETH_ALEN];
287 int r;
288
289 r = sscanf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
290 (u32 *)&mac[0], (u32 *)&mac[1], (u32 *)&mac[2],
291 (u32 *)&mac[3], (u32 *)&mac[4], (u32 *)&mac[5]);
292
293 if (r != ETH_ALEN)
294 return 1;
295
296 eth_media_addr_set(a, mac);
297 return 0;
298}
299
300/**
301 * eth_str2addr - convert Ethernet address format to message header format
302 */
303static int eth_addr2msg(struct tipc_media_addr *a, char *msg_area)
304{
305 memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE);
306 msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH;
307 memcpy(msg_area + ETH_ADDR_OFFSET, a->value, ETH_ALEN);
308 return 0;
309}
310
311/**
312 * eth_str2addr - convert message header address format to Ethernet format
313 */
314static int eth_msg2addr(struct tipc_media_addr *a, char *msg_area)
315{
316 if (msg_area[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_ETH)
317 return 1;
318
319 eth_media_addr_set(a, msg_area + ETH_ADDR_OFFSET);
320 return 0;
321}
322
323/*
324 * Ethernet media registration info
325 */
326static struct tipc_media eth_media_info = {
327 .send_msg = send_msg,
328 .enable_bearer = enable_bearer,
329 .disable_bearer = disable_bearer,
330 .addr2str = eth_addr2str,
331 .str2addr = eth_str2addr,
332 .addr2msg = eth_addr2msg,
333 .msg2addr = eth_msg2addr,
334 .bcast_addr = { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
335 TIPC_MEDIA_TYPE_ETH, 1 },
336 .priority = TIPC_DEF_LINK_PRI,
337 .tolerance = TIPC_DEF_LINK_TOL,
338 .window = TIPC_DEF_LINK_WIN,
339 .type_id = TIPC_MEDIA_TYPE_ETH,
340 .name = "eth"
341};
342
343/**
344 * tipc_eth_media_start - activate Ethernet bearer support
345 *
346 * Register Ethernet media type with TIPC bearer code. Also register
347 * with OS for notifications about device state changes.
348 */
349int tipc_eth_media_start(void)
350{
351 int res;
352
353 if (eth_started)
354 return -EINVAL;
355
356 res = tipc_register_media(ð_media_info);
357 if (res)
358 return res;
359
360 notifier.notifier_call = &recv_notification;
361 notifier.priority = 0;
362 res = register_netdevice_notifier(¬ifier);
363 if (!res)
364 eth_started = 1;
365 return res;
366}
367
368/**
369 * tipc_eth_media_stop - deactivate Ethernet bearer support
370 */
371void tipc_eth_media_stop(void)
372{
373 if (!eth_started)
374 return;
375
376 flush_scheduled_work();
377 unregister_netdevice_notifier(¬ifier);
378 eth_started = 0;
379}