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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 | |
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, | |
ae8509c4 | 65 | void *dv); |
fa7f86f1 YX |
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 | */ |
8aeb89f2 PM |
80 | static void eth_media_addr_set(const struct tipc_bearer *tb_ptr, |
81 | struct tipc_media_addr *a, char *mac) | |
4d163a32 | 82 | { |
3d749a6a AS |
83 | memcpy(a->value, mac, ETH_ALEN); |
84 | memset(a->value + ETH_ALEN, 0, sizeof(a->value) - ETH_ALEN); | |
85 | a->media_id = TIPC_MEDIA_TYPE_ETH; | |
8aeb89f2 | 86 | a->broadcast = !memcmp(mac, tb_ptr->bcast_addr.value, ETH_ALEN); |
4d163a32 AS |
87 | } |
88 | ||
b97bf3fd | 89 | /** |
c4307285 | 90 | * send_msg - send a TIPC message out over an Ethernet interface |
b97bf3fd | 91 | */ |
c4307285 | 92 | static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr, |
b97bf3fd PL |
93 | struct tipc_media_addr *dest) |
94 | { | |
95 | struct sk_buff *clone; | |
96 | struct net_device *dev; | |
9fbfca01 | 97 | int delta; |
b97bf3fd PL |
98 | |
99 | clone = skb_clone(buf, GFP_ATOMIC); | |
9fbfca01 AS |
100 | if (!clone) |
101 | return 0; | |
102 | ||
103 | dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev; | |
104 | delta = dev->hard_header_len - skb_headroom(buf); | |
105 | ||
106 | if ((delta > 0) && | |
107 | pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { | |
108 | kfree_skb(clone); | |
109 | return 0; | |
b97bf3fd | 110 | } |
9fbfca01 AS |
111 | |
112 | skb_reset_network_header(clone); | |
113 | clone->dev = dev; | |
76f5c6f3 | 114 | clone->protocol = htons(ETH_P_TIPC); |
3d749a6a | 115 | dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, |
9fbfca01 AS |
116 | dev->dev_addr, clone->len); |
117 | dev_queue_xmit(clone); | |
0e35fd5e | 118 | return 0; |
b97bf3fd PL |
119 | } |
120 | ||
121 | /** | |
122 | * recv_msg - handle incoming TIPC message from an Ethernet interface | |
c4307285 | 123 | * |
f3ec75f6 AS |
124 | * Accept only packets explicitly sent to this node, or broadcast packets; |
125 | * ignores packets sent using Ethernet multicast, and traffic sent to other | |
126 | * nodes (which can happen if interface is running in promiscuous mode). | |
b97bf3fd | 127 | */ |
c4307285 | 128 | static int recv_msg(struct sk_buff *buf, struct net_device *dev, |
b97bf3fd PL |
129 | struct packet_type *pt, struct net_device *orig_dev) |
130 | { | |
131 | struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv; | |
b97bf3fd | 132 | |
721499e8 | 133 | if (!net_eq(dev_net(dev), &init_net)) { |
e730c155 EB |
134 | kfree_skb(buf); |
135 | return 0; | |
136 | } | |
137 | ||
b97bf3fd | 138 | if (likely(eb_ptr->bearer)) { |
f3ec75f6 | 139 | if (likely(buf->pkt_type <= PACKET_BROADCAST)) { |
b2abd4c0 PG |
140 | buf->next = NULL; |
141 | tipc_recv_msg(buf, eb_ptr->bearer); | |
142 | return 0; | |
b97bf3fd | 143 | } |
b97bf3fd | 144 | } |
5e3c8854 | 145 | kfree_skb(buf); |
0e35fd5e | 146 | return 0; |
b97bf3fd PL |
147 | } |
148 | ||
4225a398 YX |
149 | /** |
150 | * setup_bearer - setup association between Ethernet bearer and interface | |
151 | */ | |
152 | static void setup_bearer(struct work_struct *work) | |
153 | { | |
154 | struct eth_bearer *eb_ptr = | |
155 | container_of(work, struct eth_bearer, setup); | |
156 | ||
157 | dev_add_pack(&eb_ptr->tipc_packet_type); | |
158 | } | |
159 | ||
b97bf3fd | 160 | /** |
c4307285 | 161 | * enable_bearer - attach TIPC bearer to an Ethernet interface |
b97bf3fd | 162 | */ |
b97bf3fd PL |
163 | static int enable_bearer(struct tipc_bearer *tb_ptr) |
164 | { | |
2537af9d | 165 | struct net_device *dev; |
b97bf3fd PL |
166 | struct eth_bearer *eb_ptr = ð_bearers[0]; |
167 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
168 | char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; | |
d1fb6279 AS |
169 | int pending_dev = 0; |
170 | ||
171 | /* Find unused Ethernet bearer structure */ | |
d1fb6279 AS |
172 | while (eb_ptr->dev) { |
173 | if (!eb_ptr->bearer) | |
174 | pending_dev++; | |
175 | if (++eb_ptr == stop) | |
176 | return pending_dev ? -EAGAIN : -EDQUOT; | |
177 | } | |
b97bf3fd PL |
178 | |
179 | /* Find device with specified name */ | |
2537af9d | 180 | dev = dev_get_by_name(&init_net, driver_name); |
b97bf3fd PL |
181 | if (!dev) |
182 | return -ENODEV; | |
183 | ||
18abf0fb | 184 | /* Create Ethernet bearer for device */ |
18abf0fb AS |
185 | eb_ptr->dev = dev; |
186 | eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC); | |
187 | eb_ptr->tipc_packet_type.dev = dev; | |
188 | eb_ptr->tipc_packet_type.func = recv_msg; | |
189 | eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr; | |
190 | INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list)); | |
4225a398 YX |
191 | INIT_WORK(&eb_ptr->setup, setup_bearer); |
192 | schedule_work(&eb_ptr->setup); | |
b97bf3fd PL |
193 | |
194 | /* Associate TIPC bearer with Ethernet bearer */ | |
b97bf3fd PL |
195 | eb_ptr->bearer = tb_ptr; |
196 | tb_ptr->usr_handle = (void *)eb_ptr; | |
8aeb89f2 PM |
197 | memset(tb_ptr->bcast_addr.value, 0, sizeof(tb_ptr->bcast_addr.value)); |
198 | memcpy(tb_ptr->bcast_addr.value, dev->broadcast, ETH_ALEN); | |
199 | tb_ptr->bcast_addr.media_id = TIPC_MEDIA_TYPE_ETH; | |
200 | tb_ptr->bcast_addr.broadcast = 1; | |
b97bf3fd | 201 | tb_ptr->mtu = dev->mtu; |
c4307285 | 202 | tb_ptr->blocked = 0; |
8aeb89f2 | 203 | eth_media_addr_set(tb_ptr, &tb_ptr->addr, (char *)dev->dev_addr); |
b97bf3fd PL |
204 | return 0; |
205 | } | |
206 | ||
64b32f7e AS |
207 | /** |
208 | * cleanup_bearer - break association between Ethernet bearer and interface | |
209 | * | |
210 | * This routine must be invoked from a work queue because it can sleep. | |
211 | */ | |
64b32f7e AS |
212 | static void cleanup_bearer(struct work_struct *work) |
213 | { | |
214 | struct eth_bearer *eb_ptr = | |
215 | container_of(work, struct eth_bearer, cleanup); | |
216 | ||
217 | dev_remove_pack(&eb_ptr->tipc_packet_type); | |
218 | dev_put(eb_ptr->dev); | |
219 | eb_ptr->dev = NULL; | |
220 | } | |
221 | ||
b97bf3fd | 222 | /** |
c4307285 | 223 | * disable_bearer - detach TIPC bearer from an Ethernet interface |
b97bf3fd | 224 | * |
64b32f7e AS |
225 | * Mark Ethernet bearer as inactive so that incoming buffers are thrown away, |
226 | * then get worker thread to complete bearer cleanup. (Can't do cleanup | |
227 | * here because cleanup code needs to sleep and caller holds spinlocks.) | |
b97bf3fd | 228 | */ |
b97bf3fd PL |
229 | static void disable_bearer(struct tipc_bearer *tb_ptr) |
230 | { | |
64b32f7e AS |
231 | struct eth_bearer *eb_ptr = (struct eth_bearer *)tb_ptr->usr_handle; |
232 | ||
233 | eb_ptr->bearer = NULL; | |
234 | INIT_WORK(&eb_ptr->cleanup, cleanup_bearer); | |
235 | schedule_work(&eb_ptr->cleanup); | |
b97bf3fd PL |
236 | } |
237 | ||
238 | /** | |
239 | * recv_notification - handle device updates from OS | |
240 | * | |
c4307285 | 241 | * Change the state of the Ethernet bearer (if any) associated with the |
b97bf3fd PL |
242 | * specified device. |
243 | */ | |
c4307285 | 244 | static int recv_notification(struct notifier_block *nb, unsigned long evt, |
351638e7 | 245 | void *ptr) |
b97bf3fd | 246 | { |
351638e7 | 247 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
b97bf3fd PL |
248 | struct eth_bearer *eb_ptr = ð_bearers[0]; |
249 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
250 | ||
721499e8 | 251 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
252 | return NOTIFY_DONE; |
253 | ||
b97bf3fd PL |
254 | while ((eb_ptr->dev != dev)) { |
255 | if (++eb_ptr == stop) | |
256 | return NOTIFY_DONE; /* couldn't find device */ | |
257 | } | |
258 | if (!eb_ptr->bearer) | |
259 | return NOTIFY_DONE; /* bearer had been disabled */ | |
260 | ||
c4307285 | 261 | eb_ptr->bearer->mtu = dev->mtu; |
b97bf3fd PL |
262 | |
263 | switch (evt) { | |
264 | case NETDEV_CHANGE: | |
265 | if (netif_carrier_ok(dev)) | |
266 | tipc_continue(eb_ptr->bearer); | |
267 | else | |
268 | tipc_block_bearer(eb_ptr->bearer->name); | |
269 | break; | |
270 | case NETDEV_UP: | |
271 | tipc_continue(eb_ptr->bearer); | |
272 | break; | |
273 | case NETDEV_DOWN: | |
274 | tipc_block_bearer(eb_ptr->bearer->name); | |
275 | break; | |
276 | case NETDEV_CHANGEMTU: | |
c4307285 | 277 | case NETDEV_CHANGEADDR: |
b97bf3fd | 278 | tipc_block_bearer(eb_ptr->bearer->name); |
c4307285 | 279 | tipc_continue(eb_ptr->bearer); |
b97bf3fd PL |
280 | break; |
281 | case NETDEV_UNREGISTER: | |
c4307285 | 282 | case NETDEV_CHANGENAME: |
b97bf3fd PL |
283 | tipc_disable_bearer(eb_ptr->bearer->name); |
284 | break; | |
285 | } | |
286 | return NOTIFY_OK; | |
287 | } | |
288 | ||
289 | /** | |
290 | * eth_addr2str - convert Ethernet address to string | |
291 | */ | |
c61b666e | 292 | static int eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size) |
c4307285 | 293 | { |
c61b666e AS |
294 | if (str_size < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */ |
295 | return 1; | |
296 | ||
3d749a6a | 297 | sprintf(str_buf, "%pM", a->value); |
c61b666e | 298 | return 0; |
b97bf3fd PL |
299 | } |
300 | ||
4d163a32 AS |
301 | /** |
302 | * eth_str2addr - convert Ethernet address format to message header format | |
303 | */ | |
4d163a32 AS |
304 | static int eth_addr2msg(struct tipc_media_addr *a, char *msg_area) |
305 | { | |
306 | memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE); | |
307 | msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH; | |
3d749a6a | 308 | memcpy(msg_area + ETH_ADDR_OFFSET, a->value, ETH_ALEN); |
4d163a32 AS |
309 | return 0; |
310 | } | |
311 | ||
312 | /** | |
313 | * eth_str2addr - convert message header address format to Ethernet format | |
314 | */ | |
8aeb89f2 PM |
315 | static int eth_msg2addr(const struct tipc_bearer *tb_ptr, |
316 | struct tipc_media_addr *a, char *msg_area) | |
4d163a32 AS |
317 | { |
318 | if (msg_area[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_ETH) | |
319 | return 1; | |
320 | ||
8aeb89f2 | 321 | eth_media_addr_set(tb_ptr, a, msg_area + ETH_ADDR_OFFSET); |
4d163a32 AS |
322 | return 0; |
323 | } | |
324 | ||
706767da AS |
325 | /* |
326 | * Ethernet media registration info | |
327 | */ | |
358a0d1c | 328 | static struct tipc_media eth_media_info = { |
706767da AS |
329 | .send_msg = send_msg, |
330 | .enable_bearer = enable_bearer, | |
331 | .disable_bearer = disable_bearer, | |
332 | .addr2str = eth_addr2str, | |
4d163a32 AS |
333 | .addr2msg = eth_addr2msg, |
334 | .msg2addr = eth_msg2addr, | |
706767da AS |
335 | .priority = TIPC_DEF_LINK_PRI, |
336 | .tolerance = TIPC_DEF_LINK_TOL, | |
337 | .window = TIPC_DEF_LINK_WIN, | |
338 | .type_id = TIPC_MEDIA_TYPE_ETH, | |
339 | .name = "eth" | |
340 | }; | |
341 | ||
b97bf3fd | 342 | /** |
4323add6 | 343 | * tipc_eth_media_start - activate Ethernet bearer support |
b97bf3fd PL |
344 | * |
345 | * Register Ethernet media type with TIPC bearer code. Also register | |
346 | * with OS for notifications about device state changes. | |
347 | */ | |
4323add6 | 348 | int tipc_eth_media_start(void) |
c4307285 | 349 | { |
b97bf3fd PL |
350 | int res; |
351 | ||
352 | if (eth_started) | |
353 | return -EINVAL; | |
354 | ||
706767da | 355 | res = tipc_register_media(ð_media_info); |
b97bf3fd PL |
356 | if (res) |
357 | return res; | |
358 | ||
b97bf3fd PL |
359 | res = register_netdevice_notifier(¬ifier); |
360 | if (!res) | |
361 | eth_started = 1; | |
362 | return res; | |
363 | } | |
364 | ||
365 | /** | |
4323add6 | 366 | * tipc_eth_media_stop - deactivate Ethernet bearer support |
b97bf3fd | 367 | */ |
4323add6 | 368 | void tipc_eth_media_stop(void) |
b97bf3fd | 369 | { |
b97bf3fd PL |
370 | if (!eth_started) |
371 | return; | |
372 | ||
64b32f7e | 373 | flush_scheduled_work(); |
b97bf3fd | 374 | unregister_netdevice_notifier(¬ifier); |
b97bf3fd PL |
375 | eth_started = 0; |
376 | } |