Commit | Line | Data |
---|---|---|
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 | |
4225a398 | 49 | * @setup: work item used when enabling bearer |
64b32f7e | 50 | * @cleanup: work item used when disabling bearer |
b97bf3fd | 51 | */ |
b97bf3fd PL |
52 | struct eth_bearer { |
53 | struct tipc_bearer *bearer; | |
54 | struct net_device *dev; | |
55 | struct packet_type tipc_packet_type; | |
4225a398 | 56 | struct work_struct setup; |
64b32f7e | 57 | struct work_struct cleanup; |
b97bf3fd PL |
58 | }; |
59 | ||
358a0d1c | 60 | static struct tipc_media eth_media_info; |
b97bf3fd | 61 | static struct eth_bearer eth_bearers[MAX_ETH_BEARERS]; |
e3ec9c7d | 62 | static int eth_started; |
fa7f86f1 YX |
63 | |
64 | static int recv_notification(struct notifier_block *nb, unsigned long evt, | |
65 | void *dv); | |
66 | /* | |
67 | * Network device notifier info | |
68 | */ | |
69 | static struct notifier_block notifier = { | |
70 | .notifier_call = recv_notification, | |
71 | .priority = 0 | |
72 | }; | |
b97bf3fd | 73 | |
4d163a32 AS |
74 | /** |
75 | * eth_media_addr_set - initialize Ethernet media address structure | |
3d749a6a AS |
76 | * |
77 | * Media-dependent "value" field stores MAC address in first 6 bytes | |
78 | * and zeroes out the remaining bytes. | |
4d163a32 | 79 | */ |
4d163a32 AS |
80 | static void eth_media_addr_set(struct tipc_media_addr *a, char *mac) |
81 | { | |
3d749a6a AS |
82 | memcpy(a->value, mac, ETH_ALEN); |
83 | memset(a->value + ETH_ALEN, 0, sizeof(a->value) - ETH_ALEN); | |
84 | a->media_id = TIPC_MEDIA_TYPE_ETH; | |
85 | a->broadcast = !memcmp(mac, eth_media_info.bcast_addr.value, ETH_ALEN); | |
4d163a32 AS |
86 | } |
87 | ||
b97bf3fd | 88 | /** |
c4307285 | 89 | * send_msg - send a TIPC message out over an Ethernet interface |
b97bf3fd | 90 | */ |
c4307285 | 91 | static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr, |
b97bf3fd PL |
92 | struct tipc_media_addr *dest) |
93 | { | |
94 | struct sk_buff *clone; | |
95 | struct net_device *dev; | |
9fbfca01 | 96 | int delta; |
b97bf3fd PL |
97 | |
98 | clone = skb_clone(buf, GFP_ATOMIC); | |
9fbfca01 AS |
99 | if (!clone) |
100 | return 0; | |
101 | ||
102 | dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev; | |
103 | delta = dev->hard_header_len - skb_headroom(buf); | |
104 | ||
105 | if ((delta > 0) && | |
106 | pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { | |
107 | kfree_skb(clone); | |
108 | return 0; | |
b97bf3fd | 109 | } |
9fbfca01 AS |
110 | |
111 | skb_reset_network_header(clone); | |
112 | clone->dev = dev; | |
3d749a6a | 113 | dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, |
9fbfca01 AS |
114 | dev->dev_addr, clone->len); |
115 | dev_queue_xmit(clone); | |
0e35fd5e | 116 | return 0; |
b97bf3fd PL |
117 | } |
118 | ||
119 | /** | |
120 | * recv_msg - handle incoming TIPC message from an Ethernet interface | |
c4307285 | 121 | * |
f3ec75f6 AS |
122 | * Accept only packets explicitly sent to this node, or broadcast packets; |
123 | * ignores packets sent using Ethernet multicast, and traffic sent to other | |
124 | * nodes (which can happen if interface is running in promiscuous mode). | |
b97bf3fd | 125 | */ |
c4307285 | 126 | static int recv_msg(struct sk_buff *buf, struct net_device *dev, |
b97bf3fd PL |
127 | struct packet_type *pt, struct net_device *orig_dev) |
128 | { | |
129 | struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv; | |
b97bf3fd | 130 | |
721499e8 | 131 | if (!net_eq(dev_net(dev), &init_net)) { |
e730c155 EB |
132 | kfree_skb(buf); |
133 | return 0; | |
134 | } | |
135 | ||
b97bf3fd | 136 | if (likely(eb_ptr->bearer)) { |
f3ec75f6 | 137 | if (likely(buf->pkt_type <= PACKET_BROADCAST)) { |
b2abd4c0 PG |
138 | buf->next = NULL; |
139 | tipc_recv_msg(buf, eb_ptr->bearer); | |
140 | return 0; | |
b97bf3fd | 141 | } |
b97bf3fd | 142 | } |
5e3c8854 | 143 | kfree_skb(buf); |
0e35fd5e | 144 | return 0; |
b97bf3fd PL |
145 | } |
146 | ||
4225a398 YX |
147 | /** |
148 | * setup_bearer - setup association between Ethernet bearer and interface | |
149 | */ | |
150 | static void setup_bearer(struct work_struct *work) | |
151 | { | |
152 | struct eth_bearer *eb_ptr = | |
153 | container_of(work, struct eth_bearer, setup); | |
154 | ||
155 | dev_add_pack(&eb_ptr->tipc_packet_type); | |
156 | } | |
157 | ||
b97bf3fd | 158 | /** |
c4307285 | 159 | * enable_bearer - attach TIPC bearer to an Ethernet interface |
b97bf3fd | 160 | */ |
b97bf3fd PL |
161 | static int enable_bearer(struct tipc_bearer *tb_ptr) |
162 | { | |
cb283ead JPM |
163 | struct net_device *dev = NULL; |
164 | struct net_device *pdev = NULL; | |
b97bf3fd PL |
165 | struct eth_bearer *eb_ptr = ð_bearers[0]; |
166 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
167 | char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; | |
d1fb6279 AS |
168 | int pending_dev = 0; |
169 | ||
170 | /* Find unused Ethernet bearer structure */ | |
d1fb6279 AS |
171 | while (eb_ptr->dev) { |
172 | if (!eb_ptr->bearer) | |
173 | pending_dev++; | |
174 | if (++eb_ptr == stop) | |
175 | return pending_dev ? -EAGAIN : -EDQUOT; | |
176 | } | |
b97bf3fd PL |
177 | |
178 | /* Find device with specified name */ | |
bcd326e8 | 179 | read_lock(&dev_base_lock); |
0e65967e | 180 | for_each_netdev(&init_net, pdev) { |
cb283ead | 181 | if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) { |
7562f876 | 182 | dev = pdev; |
bcd326e8 | 183 | dev_hold(dev); |
7562f876 PE |
184 | break; |
185 | } | |
cb283ead | 186 | } |
bcd326e8 | 187 | read_unlock(&dev_base_lock); |
b97bf3fd PL |
188 | if (!dev) |
189 | return -ENODEV; | |
190 | ||
18abf0fb | 191 | /* Create Ethernet bearer for device */ |
18abf0fb AS |
192 | eb_ptr->dev = dev; |
193 | eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC); | |
194 | eb_ptr->tipc_packet_type.dev = dev; | |
195 | eb_ptr->tipc_packet_type.func = recv_msg; | |
196 | eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr; | |
197 | INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list)); | |
4225a398 YX |
198 | INIT_WORK(&eb_ptr->setup, setup_bearer); |
199 | schedule_work(&eb_ptr->setup); | |
b97bf3fd PL |
200 | |
201 | /* Associate TIPC bearer with Ethernet bearer */ | |
b97bf3fd PL |
202 | eb_ptr->bearer = tb_ptr; |
203 | tb_ptr->usr_handle = (void *)eb_ptr; | |
204 | tb_ptr->mtu = dev->mtu; | |
c4307285 | 205 | tb_ptr->blocked = 0; |
4d163a32 | 206 | eth_media_addr_set(&tb_ptr->addr, (char *)dev->dev_addr); |
b97bf3fd PL |
207 | return 0; |
208 | } | |
209 | ||
64b32f7e AS |
210 | /** |
211 | * cleanup_bearer - break association between Ethernet bearer and interface | |
212 | * | |
213 | * This routine must be invoked from a work queue because it can sleep. | |
214 | */ | |
64b32f7e AS |
215 | static void cleanup_bearer(struct work_struct *work) |
216 | { | |
217 | struct eth_bearer *eb_ptr = | |
218 | container_of(work, struct eth_bearer, cleanup); | |
219 | ||
220 | dev_remove_pack(&eb_ptr->tipc_packet_type); | |
221 | dev_put(eb_ptr->dev); | |
222 | eb_ptr->dev = NULL; | |
223 | } | |
224 | ||
b97bf3fd | 225 | /** |
c4307285 | 226 | * disable_bearer - detach TIPC bearer from an Ethernet interface |
b97bf3fd | 227 | * |
64b32f7e AS |
228 | * Mark Ethernet bearer as inactive so that incoming buffers are thrown away, |
229 | * then get worker thread to complete bearer cleanup. (Can't do cleanup | |
230 | * here because cleanup code needs to sleep and caller holds spinlocks.) | |
b97bf3fd | 231 | */ |
b97bf3fd PL |
232 | static void disable_bearer(struct tipc_bearer *tb_ptr) |
233 | { | |
64b32f7e AS |
234 | struct eth_bearer *eb_ptr = (struct eth_bearer *)tb_ptr->usr_handle; |
235 | ||
236 | eb_ptr->bearer = NULL; | |
237 | INIT_WORK(&eb_ptr->cleanup, cleanup_bearer); | |
238 | schedule_work(&eb_ptr->cleanup); | |
b97bf3fd PL |
239 | } |
240 | ||
241 | /** | |
242 | * recv_notification - handle device updates from OS | |
243 | * | |
c4307285 | 244 | * Change the state of the Ethernet bearer (if any) associated with the |
b97bf3fd PL |
245 | * specified device. |
246 | */ | |
c4307285 | 247 | static int recv_notification(struct notifier_block *nb, unsigned long evt, |
b97bf3fd PL |
248 | void *dv) |
249 | { | |
250 | struct net_device *dev = (struct net_device *)dv; | |
251 | struct eth_bearer *eb_ptr = ð_bearers[0]; | |
252 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
253 | ||
721499e8 | 254 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
255 | return NOTIFY_DONE; |
256 | ||
b97bf3fd PL |
257 | while ((eb_ptr->dev != dev)) { |
258 | if (++eb_ptr == stop) | |
259 | return NOTIFY_DONE; /* couldn't find device */ | |
260 | } | |
261 | if (!eb_ptr->bearer) | |
262 | return NOTIFY_DONE; /* bearer had been disabled */ | |
263 | ||
c4307285 | 264 | eb_ptr->bearer->mtu = dev->mtu; |
b97bf3fd PL |
265 | |
266 | switch (evt) { | |
267 | case NETDEV_CHANGE: | |
268 | if (netif_carrier_ok(dev)) | |
269 | tipc_continue(eb_ptr->bearer); | |
270 | else | |
271 | tipc_block_bearer(eb_ptr->bearer->name); | |
272 | break; | |
273 | case NETDEV_UP: | |
274 | tipc_continue(eb_ptr->bearer); | |
275 | break; | |
276 | case NETDEV_DOWN: | |
277 | tipc_block_bearer(eb_ptr->bearer->name); | |
278 | break; | |
279 | case NETDEV_CHANGEMTU: | |
c4307285 | 280 | case NETDEV_CHANGEADDR: |
b97bf3fd | 281 | tipc_block_bearer(eb_ptr->bearer->name); |
c4307285 | 282 | tipc_continue(eb_ptr->bearer); |
b97bf3fd PL |
283 | break; |
284 | case NETDEV_UNREGISTER: | |
c4307285 | 285 | case NETDEV_CHANGENAME: |
b97bf3fd PL |
286 | tipc_disable_bearer(eb_ptr->bearer->name); |
287 | break; | |
288 | } | |
289 | return NOTIFY_OK; | |
290 | } | |
291 | ||
292 | /** | |
293 | * eth_addr2str - convert Ethernet address to string | |
294 | */ | |
c61b666e | 295 | static int eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size) |
c4307285 | 296 | { |
c61b666e AS |
297 | if (str_size < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */ |
298 | return 1; | |
299 | ||
3d749a6a | 300 | sprintf(str_buf, "%pM", a->value); |
c61b666e | 301 | return 0; |
b97bf3fd PL |
302 | } |
303 | ||
4d163a32 AS |
304 | /** |
305 | * eth_str2addr - convert string to Ethernet address | |
306 | */ | |
4d163a32 AS |
307 | static int eth_str2addr(struct tipc_media_addr *a, char *str_buf) |
308 | { | |
309 | char mac[ETH_ALEN]; | |
310 | int r; | |
311 | ||
312 | r = sscanf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x", | |
313 | (u32 *)&mac[0], (u32 *)&mac[1], (u32 *)&mac[2], | |
314 | (u32 *)&mac[3], (u32 *)&mac[4], (u32 *)&mac[5]); | |
315 | ||
316 | if (r != ETH_ALEN) | |
317 | return 1; | |
318 | ||
319 | eth_media_addr_set(a, mac); | |
320 | return 0; | |
321 | } | |
322 | ||
323 | /** | |
324 | * eth_str2addr - convert Ethernet address format to message header format | |
325 | */ | |
4d163a32 AS |
326 | static int eth_addr2msg(struct tipc_media_addr *a, char *msg_area) |
327 | { | |
328 | memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE); | |
329 | msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH; | |
3d749a6a | 330 | memcpy(msg_area + ETH_ADDR_OFFSET, a->value, ETH_ALEN); |
4d163a32 AS |
331 | return 0; |
332 | } | |
333 | ||
334 | /** | |
335 | * eth_str2addr - convert message header address format to Ethernet format | |
336 | */ | |
4d163a32 AS |
337 | static int eth_msg2addr(struct tipc_media_addr *a, char *msg_area) |
338 | { | |
339 | if (msg_area[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_ETH) | |
340 | return 1; | |
341 | ||
342 | eth_media_addr_set(a, msg_area + ETH_ADDR_OFFSET); | |
343 | return 0; | |
344 | } | |
345 | ||
706767da AS |
346 | /* |
347 | * Ethernet media registration info | |
348 | */ | |
358a0d1c | 349 | static struct tipc_media eth_media_info = { |
706767da AS |
350 | .send_msg = send_msg, |
351 | .enable_bearer = enable_bearer, | |
352 | .disable_bearer = disable_bearer, | |
353 | .addr2str = eth_addr2str, | |
4d163a32 AS |
354 | .str2addr = eth_str2addr, |
355 | .addr2msg = eth_addr2msg, | |
356 | .msg2addr = eth_msg2addr, | |
3d749a6a AS |
357 | .bcast_addr = { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, |
358 | TIPC_MEDIA_TYPE_ETH, 1 }, | |
706767da AS |
359 | .priority = TIPC_DEF_LINK_PRI, |
360 | .tolerance = TIPC_DEF_LINK_TOL, | |
361 | .window = TIPC_DEF_LINK_WIN, | |
362 | .type_id = TIPC_MEDIA_TYPE_ETH, | |
363 | .name = "eth" | |
364 | }; | |
365 | ||
b97bf3fd | 366 | /** |
4323add6 | 367 | * tipc_eth_media_start - activate Ethernet bearer support |
b97bf3fd PL |
368 | * |
369 | * Register Ethernet media type with TIPC bearer code. Also register | |
370 | * with OS for notifications about device state changes. | |
371 | */ | |
4323add6 | 372 | int tipc_eth_media_start(void) |
c4307285 | 373 | { |
b97bf3fd PL |
374 | int res; |
375 | ||
376 | if (eth_started) | |
377 | return -EINVAL; | |
378 | ||
706767da | 379 | res = tipc_register_media(ð_media_info); |
b97bf3fd PL |
380 | if (res) |
381 | return res; | |
382 | ||
b97bf3fd PL |
383 | res = register_netdevice_notifier(¬ifier); |
384 | if (!res) | |
385 | eth_started = 1; | |
386 | return res; | |
387 | } | |
388 | ||
389 | /** | |
4323add6 | 390 | * tipc_eth_media_stop - deactivate Ethernet bearer support |
b97bf3fd | 391 | */ |
4323add6 | 392 | void tipc_eth_media_stop(void) |
b97bf3fd | 393 | { |
b97bf3fd PL |
394 | if (!eth_started) |
395 | return; | |
396 | ||
64b32f7e | 397 | flush_scheduled_work(); |
b97bf3fd | 398 | unregister_netdevice_notifier(¬ifier); |
b97bf3fd PL |
399 | eth_started = 0; |
400 | } |