Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/eth_media.c: Ethernet bearer support for TIPC | |
c4307285 | 3 | * |
f3ec75f6 | 4 | * Copyright (c) 2001-2007, Ericsson AB |
bcd326e8 | 5 | * Copyright (c) 2005-2008, 2011, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
d265fef6 AS |
37 | #include "core.h" |
38 | #include "bearer.h" | |
39 | ||
909234cd | 40 | #define MAX_ETH_BEARERS MAX_BEARERS |
b97bf3fd | 41 | |
4d163a32 AS |
42 | #define ETH_ADDR_OFFSET 4 /* message header offset of MAC address */ |
43 | ||
b97bf3fd PL |
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 | |
64b32f7e | 49 | * @cleanup: work item used when disabling bearer |
b97bf3fd | 50 | */ |
c4307285 | 51 | |
b97bf3fd PL |
52 | struct eth_bearer { |
53 | struct tipc_bearer *bearer; | |
54 | struct net_device *dev; | |
55 | struct packet_type tipc_packet_type; | |
64b32f7e | 56 | struct work_struct cleanup; |
b97bf3fd PL |
57 | }; |
58 | ||
3d749a6a | 59 | static struct media eth_media_info; |
b97bf3fd | 60 | static struct eth_bearer eth_bearers[MAX_ETH_BEARERS]; |
e3ec9c7d | 61 | static int eth_started; |
b97bf3fd PL |
62 | static struct notifier_block notifier; |
63 | ||
4d163a32 AS |
64 | /** |
65 | * eth_media_addr_set - initialize Ethernet media address structure | |
3d749a6a AS |
66 | * |
67 | * Media-dependent "value" field stores MAC address in first 6 bytes | |
68 | * and zeroes out the remaining bytes. | |
4d163a32 AS |
69 | */ |
70 | ||
71 | static void eth_media_addr_set(struct tipc_media_addr *a, char *mac) | |
72 | { | |
3d749a6a AS |
73 | memcpy(a->value, mac, ETH_ALEN); |
74 | memset(a->value + ETH_ALEN, 0, sizeof(a->value) - ETH_ALEN); | |
75 | a->media_id = TIPC_MEDIA_TYPE_ETH; | |
76 | a->broadcast = !memcmp(mac, eth_media_info.bcast_addr.value, ETH_ALEN); | |
4d163a32 AS |
77 | } |
78 | ||
b97bf3fd | 79 | /** |
c4307285 | 80 | * send_msg - send a TIPC message out over an Ethernet interface |
b97bf3fd PL |
81 | */ |
82 | ||
c4307285 | 83 | static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr, |
b97bf3fd PL |
84 | struct tipc_media_addr *dest) |
85 | { | |
86 | struct sk_buff *clone; | |
87 | struct net_device *dev; | |
9fbfca01 | 88 | int delta; |
b97bf3fd PL |
89 | |
90 | clone = skb_clone(buf, GFP_ATOMIC); | |
9fbfca01 AS |
91 | if (!clone) |
92 | return 0; | |
93 | ||
94 | dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev; | |
95 | delta = dev->hard_header_len - skb_headroom(buf); | |
96 | ||
97 | if ((delta > 0) && | |
98 | pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { | |
99 | kfree_skb(clone); | |
100 | return 0; | |
b97bf3fd | 101 | } |
9fbfca01 AS |
102 | |
103 | skb_reset_network_header(clone); | |
104 | clone->dev = dev; | |
3d749a6a | 105 | dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, |
9fbfca01 AS |
106 | dev->dev_addr, clone->len); |
107 | dev_queue_xmit(clone); | |
0e35fd5e | 108 | return 0; |
b97bf3fd PL |
109 | } |
110 | ||
111 | /** | |
112 | * recv_msg - handle incoming TIPC message from an Ethernet interface | |
c4307285 | 113 | * |
f3ec75f6 AS |
114 | * Accept only packets explicitly sent to this node, or broadcast packets; |
115 | * ignores packets sent using Ethernet multicast, and traffic sent to other | |
116 | * nodes (which can happen if interface is running in promiscuous mode). | |
b97bf3fd PL |
117 | */ |
118 | ||
c4307285 | 119 | static int recv_msg(struct sk_buff *buf, struct net_device *dev, |
b97bf3fd PL |
120 | struct packet_type *pt, struct net_device *orig_dev) |
121 | { | |
122 | struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv; | |
b97bf3fd | 123 | |
721499e8 | 124 | if (!net_eq(dev_net(dev), &init_net)) { |
e730c155 EB |
125 | kfree_skb(buf); |
126 | return 0; | |
127 | } | |
128 | ||
b97bf3fd | 129 | if (likely(eb_ptr->bearer)) { |
f3ec75f6 | 130 | if (likely(buf->pkt_type <= PACKET_BROADCAST)) { |
b2abd4c0 PG |
131 | buf->next = NULL; |
132 | tipc_recv_msg(buf, eb_ptr->bearer); | |
133 | return 0; | |
b97bf3fd | 134 | } |
b97bf3fd | 135 | } |
5e3c8854 | 136 | kfree_skb(buf); |
0e35fd5e | 137 | return 0; |
b97bf3fd PL |
138 | } |
139 | ||
140 | /** | |
c4307285 | 141 | * enable_bearer - attach TIPC bearer to an Ethernet interface |
b97bf3fd PL |
142 | */ |
143 | ||
144 | static int enable_bearer(struct tipc_bearer *tb_ptr) | |
145 | { | |
cb283ead JPM |
146 | struct net_device *dev = NULL; |
147 | struct net_device *pdev = NULL; | |
b97bf3fd PL |
148 | struct eth_bearer *eb_ptr = ð_bearers[0]; |
149 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
150 | char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; | |
d1fb6279 AS |
151 | int pending_dev = 0; |
152 | ||
153 | /* Find unused Ethernet bearer structure */ | |
154 | ||
155 | while (eb_ptr->dev) { | |
156 | if (!eb_ptr->bearer) | |
157 | pending_dev++; | |
158 | if (++eb_ptr == stop) | |
159 | return pending_dev ? -EAGAIN : -EDQUOT; | |
160 | } | |
b97bf3fd PL |
161 | |
162 | /* Find device with specified name */ | |
cb283ead | 163 | |
bcd326e8 | 164 | read_lock(&dev_base_lock); |
0e65967e | 165 | for_each_netdev(&init_net, pdev) { |
cb283ead | 166 | if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) { |
7562f876 | 167 | dev = pdev; |
bcd326e8 | 168 | dev_hold(dev); |
7562f876 PE |
169 | break; |
170 | } | |
cb283ead | 171 | } |
bcd326e8 | 172 | read_unlock(&dev_base_lock); |
b97bf3fd PL |
173 | if (!dev) |
174 | return -ENODEV; | |
175 | ||
18abf0fb AS |
176 | /* Create Ethernet bearer for device */ |
177 | ||
178 | eb_ptr->dev = dev; | |
179 | eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC); | |
180 | eb_ptr->tipc_packet_type.dev = dev; | |
181 | eb_ptr->tipc_packet_type.func = recv_msg; | |
182 | eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr; | |
183 | INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list)); | |
184 | dev_add_pack(&eb_ptr->tipc_packet_type); | |
b97bf3fd PL |
185 | |
186 | /* Associate TIPC bearer with Ethernet bearer */ | |
187 | ||
188 | eb_ptr->bearer = tb_ptr; | |
189 | tb_ptr->usr_handle = (void *)eb_ptr; | |
190 | tb_ptr->mtu = dev->mtu; | |
c4307285 | 191 | tb_ptr->blocked = 0; |
4d163a32 | 192 | eth_media_addr_set(&tb_ptr->addr, (char *)dev->dev_addr); |
b97bf3fd PL |
193 | return 0; |
194 | } | |
195 | ||
64b32f7e AS |
196 | /** |
197 | * cleanup_bearer - break association between Ethernet bearer and interface | |
198 | * | |
199 | * This routine must be invoked from a work queue because it can sleep. | |
200 | */ | |
201 | ||
202 | static void cleanup_bearer(struct work_struct *work) | |
203 | { | |
204 | struct eth_bearer *eb_ptr = | |
205 | container_of(work, struct eth_bearer, cleanup); | |
206 | ||
207 | dev_remove_pack(&eb_ptr->tipc_packet_type); | |
208 | dev_put(eb_ptr->dev); | |
209 | eb_ptr->dev = NULL; | |
210 | } | |
211 | ||
b97bf3fd | 212 | /** |
c4307285 | 213 | * disable_bearer - detach TIPC bearer from an Ethernet interface |
b97bf3fd | 214 | * |
64b32f7e AS |
215 | * Mark Ethernet bearer as inactive so that incoming buffers are thrown away, |
216 | * then get worker thread to complete bearer cleanup. (Can't do cleanup | |
217 | * here because cleanup code needs to sleep and caller holds spinlocks.) | |
b97bf3fd PL |
218 | */ |
219 | ||
220 | static void disable_bearer(struct tipc_bearer *tb_ptr) | |
221 | { | |
64b32f7e AS |
222 | struct eth_bearer *eb_ptr = (struct eth_bearer *)tb_ptr->usr_handle; |
223 | ||
224 | eb_ptr->bearer = NULL; | |
225 | INIT_WORK(&eb_ptr->cleanup, cleanup_bearer); | |
226 | schedule_work(&eb_ptr->cleanup); | |
b97bf3fd PL |
227 | } |
228 | ||
229 | /** | |
230 | * recv_notification - handle device updates from OS | |
231 | * | |
c4307285 | 232 | * Change the state of the Ethernet bearer (if any) associated with the |
b97bf3fd PL |
233 | * specified device. |
234 | */ | |
235 | ||
c4307285 | 236 | static int recv_notification(struct notifier_block *nb, unsigned long evt, |
b97bf3fd PL |
237 | void *dv) |
238 | { | |
239 | struct net_device *dev = (struct net_device *)dv; | |
240 | struct eth_bearer *eb_ptr = ð_bearers[0]; | |
241 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
242 | ||
721499e8 | 243 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
244 | return NOTIFY_DONE; |
245 | ||
b97bf3fd PL |
246 | while ((eb_ptr->dev != dev)) { |
247 | if (++eb_ptr == stop) | |
248 | return NOTIFY_DONE; /* couldn't find device */ | |
249 | } | |
250 | if (!eb_ptr->bearer) | |
251 | return NOTIFY_DONE; /* bearer had been disabled */ | |
252 | ||
c4307285 | 253 | eb_ptr->bearer->mtu = dev->mtu; |
b97bf3fd PL |
254 | |
255 | switch (evt) { | |
256 | case NETDEV_CHANGE: | |
257 | if (netif_carrier_ok(dev)) | |
258 | tipc_continue(eb_ptr->bearer); | |
259 | else | |
260 | tipc_block_bearer(eb_ptr->bearer->name); | |
261 | break; | |
262 | case NETDEV_UP: | |
263 | tipc_continue(eb_ptr->bearer); | |
264 | break; | |
265 | case NETDEV_DOWN: | |
266 | tipc_block_bearer(eb_ptr->bearer->name); | |
267 | break; | |
268 | case NETDEV_CHANGEMTU: | |
c4307285 | 269 | case NETDEV_CHANGEADDR: |
b97bf3fd | 270 | tipc_block_bearer(eb_ptr->bearer->name); |
c4307285 | 271 | tipc_continue(eb_ptr->bearer); |
b97bf3fd PL |
272 | break; |
273 | case NETDEV_UNREGISTER: | |
c4307285 | 274 | case NETDEV_CHANGENAME: |
b97bf3fd PL |
275 | tipc_disable_bearer(eb_ptr->bearer->name); |
276 | break; | |
277 | } | |
278 | return NOTIFY_OK; | |
279 | } | |
280 | ||
281 | /** | |
282 | * eth_addr2str - convert Ethernet address to string | |
283 | */ | |
284 | ||
c61b666e | 285 | static int eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size) |
c4307285 | 286 | { |
c61b666e AS |
287 | if (str_size < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */ |
288 | return 1; | |
289 | ||
3d749a6a | 290 | sprintf(str_buf, "%pM", a->value); |
c61b666e | 291 | return 0; |
b97bf3fd PL |
292 | } |
293 | ||
4d163a32 AS |
294 | /** |
295 | * eth_str2addr - convert string to Ethernet address | |
296 | */ | |
297 | ||
298 | static int eth_str2addr(struct tipc_media_addr *a, char *str_buf) | |
299 | { | |
300 | char mac[ETH_ALEN]; | |
301 | int r; | |
302 | ||
303 | r = sscanf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x", | |
304 | (u32 *)&mac[0], (u32 *)&mac[1], (u32 *)&mac[2], | |
305 | (u32 *)&mac[3], (u32 *)&mac[4], (u32 *)&mac[5]); | |
306 | ||
307 | if (r != ETH_ALEN) | |
308 | return 1; | |
309 | ||
310 | eth_media_addr_set(a, mac); | |
311 | return 0; | |
312 | } | |
313 | ||
314 | /** | |
315 | * eth_str2addr - convert Ethernet address format to message header format | |
316 | */ | |
317 | ||
318 | static int eth_addr2msg(struct tipc_media_addr *a, char *msg_area) | |
319 | { | |
320 | memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE); | |
321 | msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH; | |
3d749a6a | 322 | memcpy(msg_area + ETH_ADDR_OFFSET, a->value, ETH_ALEN); |
4d163a32 AS |
323 | return 0; |
324 | } | |
325 | ||
326 | /** | |
327 | * eth_str2addr - convert message header address format to Ethernet format | |
328 | */ | |
329 | ||
330 | static int eth_msg2addr(struct tipc_media_addr *a, char *msg_area) | |
331 | { | |
332 | if (msg_area[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_ETH) | |
333 | return 1; | |
334 | ||
335 | eth_media_addr_set(a, msg_area + ETH_ADDR_OFFSET); | |
336 | return 0; | |
337 | } | |
338 | ||
706767da AS |
339 | /* |
340 | * Ethernet media registration info | |
341 | */ | |
342 | ||
343 | static struct media eth_media_info = { | |
344 | .send_msg = send_msg, | |
345 | .enable_bearer = enable_bearer, | |
346 | .disable_bearer = disable_bearer, | |
347 | .addr2str = eth_addr2str, | |
4d163a32 AS |
348 | .str2addr = eth_str2addr, |
349 | .addr2msg = eth_addr2msg, | |
350 | .msg2addr = eth_msg2addr, | |
3d749a6a AS |
351 | .bcast_addr = { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, |
352 | TIPC_MEDIA_TYPE_ETH, 1 }, | |
706767da AS |
353 | .priority = TIPC_DEF_LINK_PRI, |
354 | .tolerance = TIPC_DEF_LINK_TOL, | |
355 | .window = TIPC_DEF_LINK_WIN, | |
356 | .type_id = TIPC_MEDIA_TYPE_ETH, | |
357 | .name = "eth" | |
358 | }; | |
359 | ||
b97bf3fd | 360 | /** |
4323add6 | 361 | * tipc_eth_media_start - activate Ethernet bearer support |
b97bf3fd PL |
362 | * |
363 | * Register Ethernet media type with TIPC bearer code. Also register | |
364 | * with OS for notifications about device state changes. | |
365 | */ | |
366 | ||
4323add6 | 367 | int tipc_eth_media_start(void) |
c4307285 | 368 | { |
b97bf3fd PL |
369 | int res; |
370 | ||
371 | if (eth_started) | |
372 | return -EINVAL; | |
373 | ||
706767da | 374 | res = tipc_register_media(ð_media_info); |
b97bf3fd PL |
375 | if (res) |
376 | return res; | |
377 | ||
378 | notifier.notifier_call = &recv_notification; | |
379 | notifier.priority = 0; | |
380 | res = register_netdevice_notifier(¬ifier); | |
381 | if (!res) | |
382 | eth_started = 1; | |
383 | return res; | |
384 | } | |
385 | ||
386 | /** | |
4323add6 | 387 | * tipc_eth_media_stop - deactivate Ethernet bearer support |
b97bf3fd PL |
388 | */ |
389 | ||
4323add6 | 390 | void tipc_eth_media_stop(void) |
b97bf3fd | 391 | { |
b97bf3fd PL |
392 | if (!eth_started) |
393 | return; | |
394 | ||
64b32f7e | 395 | flush_scheduled_work(); |
b97bf3fd | 396 | unregister_netdevice_notifier(¬ifier); |
b97bf3fd PL |
397 | eth_started = 0; |
398 | } |