Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/bearer.c: TIPC bearer code | |
c4307285 | 3 | * |
5702dbab | 4 | * Copyright (c) 1996-2006, 2013, Ericsson AB |
e4d050cb | 5 | * Copyright (c) 2004-2006, 2010-2013, 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 | ||
37 | #include "core.h" | |
38 | #include "config.h" | |
b97bf3fd | 39 | #include "bearer.h" |
b97bf3fd | 40 | #include "discover.h" |
b97bf3fd | 41 | |
a29a194a | 42 | #define MAX_ADDR_STR 60 |
b97bf3fd | 43 | |
ef72a7e0 | 44 | static struct tipc_media * const media_info_array[] = { |
5702dbab JPM |
45 | ð_media_info, |
46 | #ifdef CONFIG_TIPC_MEDIA_IB | |
47 | &ib_media_info, | |
48 | #endif | |
49 | NULL | |
50 | }; | |
b97bf3fd | 51 | |
987b58be | 52 | struct tipc_bearer *bearer_list[MAX_BEARERS + 1]; |
b97bf3fd | 53 | |
7d33939f | 54 | static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down); |
3a777ff8 | 55 | |
b97bf3fd | 56 | /** |
5c216e1d | 57 | * tipc_media_find - locates specified media object by name |
b97bf3fd | 58 | */ |
358a0d1c | 59 | struct tipc_media *tipc_media_find(const char *name) |
b97bf3fd | 60 | { |
b97bf3fd PL |
61 | u32 i; |
62 | ||
ef72a7e0 JPM |
63 | for (i = 0; media_info_array[i] != NULL; i++) { |
64 | if (!strcmp(media_info_array[i]->name, name)) | |
5702dbab | 65 | break; |
b97bf3fd | 66 | } |
ef72a7e0 | 67 | return media_info_array[i]; |
b97bf3fd PL |
68 | } |
69 | ||
c79be454 AS |
70 | /** |
71 | * media_find_id - locates specified media object by type identifier | |
72 | */ | |
358a0d1c | 73 | static struct tipc_media *media_find_id(u8 type) |
c79be454 AS |
74 | { |
75 | u32 i; | |
76 | ||
ef72a7e0 JPM |
77 | for (i = 0; media_info_array[i] != NULL; i++) { |
78 | if (media_info_array[i]->type_id == type) | |
5702dbab | 79 | break; |
c79be454 | 80 | } |
ef72a7e0 | 81 | return media_info_array[i]; |
b97bf3fd PL |
82 | } |
83 | ||
84 | /** | |
4323add6 | 85 | * tipc_media_addr_printf - record media address in print buffer |
b97bf3fd | 86 | */ |
dc1aed37 | 87 | void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) |
b97bf3fd | 88 | { |
c61b666e | 89 | char addr_str[MAX_ADDR_STR]; |
358a0d1c | 90 | struct tipc_media *m_ptr; |
dc1aed37 | 91 | int ret; |
b97bf3fd | 92 | |
3d749a6a | 93 | m_ptr = media_find_id(a->media_id); |
b97bf3fd | 94 | |
c61b666e | 95 | if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str))) |
dc1aed37 | 96 | ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str); |
c61b666e | 97 | else { |
c61b666e | 98 | u32 i; |
b97bf3fd | 99 | |
dc1aed37 | 100 | ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id); |
3d749a6a | 101 | for (i = 0; i < sizeof(a->value); i++) |
dc1aed37 EH |
102 | ret += tipc_snprintf(buf - ret, len + ret, |
103 | "-%02x", a->value[i]); | |
b97bf3fd PL |
104 | } |
105 | } | |
106 | ||
107 | /** | |
4323add6 | 108 | * tipc_media_get_names - record names of registered media in buffer |
b97bf3fd | 109 | */ |
4323add6 | 110 | struct sk_buff *tipc_media_get_names(void) |
b97bf3fd PL |
111 | { |
112 | struct sk_buff *buf; | |
b97bf3fd PL |
113 | int i; |
114 | ||
4323add6 | 115 | buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME)); |
b97bf3fd PL |
116 | if (!buf) |
117 | return NULL; | |
118 | ||
ef72a7e0 | 119 | for (i = 0; media_info_array[i] != NULL; i++) { |
a31abe8d | 120 | tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, |
ef72a7e0 JPM |
121 | media_info_array[i]->name, |
122 | strlen(media_info_array[i]->name) + 1); | |
b97bf3fd | 123 | } |
b97bf3fd PL |
124 | return buf; |
125 | } | |
126 | ||
127 | /** | |
128 | * bearer_name_validate - validate & (optionally) deconstruct bearer name | |
2c53040f BH |
129 | * @name: ptr to bearer name string |
130 | * @name_parts: ptr to area for bearer name components (or NULL if not needed) | |
c4307285 | 131 | * |
b97bf3fd PL |
132 | * Returns 1 if bearer name is valid, otherwise 0. |
133 | */ | |
c4307285 | 134 | static int bearer_name_validate(const char *name, |
f19765f4 | 135 | struct tipc_bearer_names *name_parts) |
b97bf3fd PL |
136 | { |
137 | char name_copy[TIPC_MAX_BEARER_NAME]; | |
138 | char *media_name; | |
139 | char *if_name; | |
140 | u32 media_len; | |
141 | u32 if_len; | |
142 | ||
143 | /* copy bearer name & ensure length is OK */ | |
b97bf3fd PL |
144 | name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; |
145 | /* need above in case non-Posix strncpy() doesn't pad with nulls */ | |
146 | strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); | |
147 | if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) | |
148 | return 0; | |
149 | ||
150 | /* ensure all component parts of bearer name are present */ | |
b97bf3fd | 151 | media_name = name_copy; |
2db9983a AS |
152 | if_name = strchr(media_name, ':'); |
153 | if (if_name == NULL) | |
b97bf3fd PL |
154 | return 0; |
155 | *(if_name++) = 0; | |
156 | media_len = if_name - media_name; | |
157 | if_len = strlen(if_name) + 1; | |
158 | ||
159 | /* validate component parts of bearer name */ | |
c4307285 | 160 | if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || |
fc073938 | 161 | (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) |
b97bf3fd PL |
162 | return 0; |
163 | ||
164 | /* return bearer name components, if necessary */ | |
b97bf3fd PL |
165 | if (name_parts) { |
166 | strcpy(name_parts->media_name, media_name); | |
167 | strcpy(name_parts->if_name, if_name); | |
168 | } | |
169 | return 1; | |
170 | } | |
171 | ||
172 | /** | |
5c216e1d | 173 | * tipc_bearer_find - locates bearer object with matching bearer name |
b97bf3fd | 174 | */ |
5c216e1d | 175 | struct tipc_bearer *tipc_bearer_find(const char *name) |
b97bf3fd | 176 | { |
2d627b92 | 177 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
178 | u32 i; |
179 | ||
3874ccbb YX |
180 | for (i = 0; i < MAX_BEARERS; i++) { |
181 | b_ptr = bearer_list[i]; | |
f47de12b | 182 | if (b_ptr && (!strcmp(b_ptr->name, name))) |
b97bf3fd PL |
183 | return b_ptr; |
184 | } | |
1fc54d8f | 185 | return NULL; |
b97bf3fd PL |
186 | } |
187 | ||
188 | /** | |
4323add6 | 189 | * tipc_bearer_get_names - record names of bearers in buffer |
b97bf3fd | 190 | */ |
4323add6 | 191 | struct sk_buff *tipc_bearer_get_names(void) |
b97bf3fd PL |
192 | { |
193 | struct sk_buff *buf; | |
ef72a7e0 | 194 | struct tipc_bearer *b; |
b97bf3fd PL |
195 | int i, j; |
196 | ||
4323add6 | 197 | buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME)); |
b97bf3fd PL |
198 | if (!buf) |
199 | return NULL; | |
200 | ||
4323add6 | 201 | read_lock_bh(&tipc_net_lock); |
ef72a7e0 | 202 | for (i = 0; media_info_array[i] != NULL; i++) { |
b97bf3fd | 203 | for (j = 0; j < MAX_BEARERS; j++) { |
3874ccbb YX |
204 | b = bearer_list[j]; |
205 | if (!b) | |
206 | continue; | |
f47de12b | 207 | if (b->media == media_info_array[i]) { |
c4307285 | 208 | tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME, |
ef72a7e0 JPM |
209 | b->name, |
210 | strlen(b->name) + 1); | |
b97bf3fd PL |
211 | } |
212 | } | |
213 | } | |
4323add6 | 214 | read_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
215 | return buf; |
216 | } | |
217 | ||
2d627b92 | 218 | void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest) |
b97bf3fd | 219 | { |
4323add6 | 220 | tipc_nmap_add(&b_ptr->nodes, dest); |
4323add6 | 221 | tipc_bcbearer_sort(); |
1209966c | 222 | tipc_disc_add_dest(b_ptr->link_req); |
b97bf3fd PL |
223 | } |
224 | ||
2d627b92 | 225 | void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest) |
b97bf3fd | 226 | { |
4323add6 | 227 | tipc_nmap_remove(&b_ptr->nodes, dest); |
4323add6 | 228 | tipc_bcbearer_sort(); |
1209966c | 229 | tipc_disc_remove_dest(b_ptr->link_req); |
b97bf3fd PL |
230 | } |
231 | ||
b97bf3fd PL |
232 | /** |
233 | * tipc_enable_bearer - enable bearer with the given name | |
c4307285 | 234 | */ |
50d3e639 | 235 | int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority) |
b97bf3fd | 236 | { |
2d627b92 | 237 | struct tipc_bearer *b_ptr; |
358a0d1c | 238 | struct tipc_media *m_ptr; |
f19765f4 | 239 | struct tipc_bearer_names b_names; |
b97bf3fd PL |
240 | char addr_string[16]; |
241 | u32 bearer_id; | |
242 | u32 with_this_prio; | |
243 | u32 i; | |
244 | int res = -EINVAL; | |
245 | ||
b58343f9 | 246 | if (!tipc_own_addr) { |
2cf8aa19 EH |
247 | pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", |
248 | name); | |
b97bf3fd | 249 | return -ENOPROTOOPT; |
a10bd924 | 250 | } |
f19765f4 | 251 | if (!bearer_name_validate(name, &b_names)) { |
2cf8aa19 | 252 | pr_warn("Bearer <%s> rejected, illegal name\n", name); |
16cb4b33 | 253 | return -EINVAL; |
a10bd924 | 254 | } |
66e019a6 AS |
255 | if (tipc_addr_domain_valid(disc_domain) && |
256 | (disc_domain != tipc_own_addr)) { | |
257 | if (tipc_in_scope(disc_domain, tipc_own_addr)) { | |
258 | disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK; | |
259 | res = 0; /* accept any node in own cluster */ | |
336ebf5b | 260 | } else if (in_own_cluster_exact(disc_domain)) |
66e019a6 AS |
261 | res = 0; /* accept specified node in own cluster */ |
262 | } | |
263 | if (res) { | |
2cf8aa19 EH |
264 | pr_warn("Bearer <%s> rejected, illegal discovery domain\n", |
265 | name); | |
a10bd924 AS |
266 | return -EINVAL; |
267 | } | |
9efde4a0 | 268 | if ((priority > TIPC_MAX_LINK_PRI) && |
a10bd924 | 269 | (priority != TIPC_MEDIA_LINK_PRI)) { |
2cf8aa19 | 270 | pr_warn("Bearer <%s> rejected, illegal priority\n", name); |
b97bf3fd | 271 | return -EINVAL; |
a10bd924 | 272 | } |
b97bf3fd | 273 | |
4323add6 | 274 | write_lock_bh(&tipc_net_lock); |
b97bf3fd | 275 | |
f19765f4 | 276 | m_ptr = tipc_media_find(b_names.media_name); |
b97bf3fd | 277 | if (!m_ptr) { |
2cf8aa19 EH |
278 | pr_warn("Bearer <%s> rejected, media <%s> not registered\n", |
279 | name, b_names.media_name); | |
3a777ff8 | 280 | goto exit; |
b97bf3fd | 281 | } |
16cb4b33 PL |
282 | |
283 | if (priority == TIPC_MEDIA_LINK_PRI) | |
b97bf3fd PL |
284 | priority = m_ptr->priority; |
285 | ||
286 | restart: | |
287 | bearer_id = MAX_BEARERS; | |
288 | with_this_prio = 1; | |
289 | for (i = MAX_BEARERS; i-- != 0; ) { | |
3874ccbb | 290 | b_ptr = bearer_list[i]; |
f47de12b | 291 | if (!b_ptr) { |
b97bf3fd PL |
292 | bearer_id = i; |
293 | continue; | |
294 | } | |
3874ccbb | 295 | if (!strcmp(name, b_ptr->name)) { |
2cf8aa19 EH |
296 | pr_warn("Bearer <%s> rejected, already enabled\n", |
297 | name); | |
3a777ff8 | 298 | goto exit; |
b97bf3fd | 299 | } |
3874ccbb | 300 | if ((b_ptr->priority == priority) && |
b97bf3fd PL |
301 | (++with_this_prio > 2)) { |
302 | if (priority-- == 0) { | |
2cf8aa19 EH |
303 | pr_warn("Bearer <%s> rejected, duplicate priority\n", |
304 | name); | |
3a777ff8 | 305 | goto exit; |
b97bf3fd | 306 | } |
2cf8aa19 EH |
307 | pr_warn("Bearer <%s> priority adjustment required %u->%u\n", |
308 | name, priority + 1, priority); | |
b97bf3fd PL |
309 | goto restart; |
310 | } | |
311 | } | |
312 | if (bearer_id >= MAX_BEARERS) { | |
2cf8aa19 EH |
313 | pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", |
314 | name, MAX_BEARERS); | |
3a777ff8 | 315 | goto exit; |
b97bf3fd PL |
316 | } |
317 | ||
3874ccbb YX |
318 | b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC); |
319 | if (!b_ptr) { | |
320 | res = -ENOMEM; | |
321 | goto exit; | |
322 | } | |
2d627b92 | 323 | strcpy(b_ptr->name, name); |
e4d050cb | 324 | b_ptr->media = m_ptr; |
4babbaa8 | 325 | res = m_ptr->enable_media(b_ptr); |
b97bf3fd | 326 | if (res) { |
2cf8aa19 EH |
327 | pr_warn("Bearer <%s> rejected, enable failure (%d)\n", |
328 | name, -res); | |
3a777ff8 | 329 | goto exit; |
b97bf3fd PL |
330 | } |
331 | ||
332 | b_ptr->identity = bearer_id; | |
5c216e1d AS |
333 | b_ptr->tolerance = m_ptr->tolerance; |
334 | b_ptr->window = m_ptr->window; | |
b97bf3fd | 335 | b_ptr->net_plane = bearer_id + 'A'; |
b97bf3fd | 336 | b_ptr->priority = priority; |
3a777ff8 | 337 | |
8aeb89f2 | 338 | res = tipc_disc_create(b_ptr, &b_ptr->bcast_addr, disc_domain); |
3a777ff8 | 339 | if (res) { |
7d33939f | 340 | bearer_disable(b_ptr, false); |
2cf8aa19 EH |
341 | pr_warn("Bearer <%s> rejected, discovery object creation failed\n", |
342 | name); | |
3a777ff8 AS |
343 | goto exit; |
344 | } | |
3874ccbb YX |
345 | |
346 | bearer_list[bearer_id] = b_ptr; | |
347 | ||
2cf8aa19 EH |
348 | pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", |
349 | name, | |
350 | tipc_addr_string_fill(addr_string, disc_domain), priority); | |
3a777ff8 | 351 | exit: |
4323add6 | 352 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
353 | return res; |
354 | } | |
355 | ||
356 | /** | |
512137ee | 357 | * tipc_reset_bearer - Reset all links established over this bearer |
b97bf3fd | 358 | */ |
6e967adf | 359 | static int tipc_reset_bearer(struct tipc_bearer *b_ptr) |
b97bf3fd | 360 | { |
4323add6 | 361 | read_lock_bh(&tipc_net_lock); |
512137ee | 362 | pr_info("Resetting bearer <%s>\n", b_ptr->name); |
c61dd61d | 363 | tipc_link_reset_list(b_ptr->identity); |
4323add6 | 364 | read_unlock_bh(&tipc_net_lock); |
0e35fd5e | 365 | return 0; |
b97bf3fd PL |
366 | } |
367 | ||
368 | /** | |
617d3c7a | 369 | * bearer_disable |
c4307285 | 370 | * |
4323add6 | 371 | * Note: This routine assumes caller holds tipc_net_lock. |
b97bf3fd | 372 | */ |
7d33939f | 373 | static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down) |
b97bf3fd | 374 | { |
3874ccbb YX |
375 | u32 i; |
376 | ||
2cf8aa19 | 377 | pr_info("Disabling bearer <%s>\n", b_ptr->name); |
4babbaa8 | 378 | b_ptr->media->disable_media(b_ptr); |
d4cca39d | 379 | |
a8304529 YX |
380 | tipc_link_delete_list(b_ptr->identity, shutting_down); |
381 | if (b_ptr->link_req) | |
382 | tipc_disc_delete(b_ptr->link_req); | |
3874ccbb YX |
383 | |
384 | for (i = 0; i < MAX_BEARERS; i++) { | |
385 | if (b_ptr == bearer_list[i]) { | |
386 | bearer_list[i] = NULL; | |
387 | break; | |
388 | } | |
389 | } | |
390 | kfree(b_ptr); | |
b97bf3fd PL |
391 | } |
392 | ||
393 | int tipc_disable_bearer(const char *name) | |
394 | { | |
2d627b92 | 395 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
396 | int res; |
397 | ||
4323add6 | 398 | write_lock_bh(&tipc_net_lock); |
5c216e1d | 399 | b_ptr = tipc_bearer_find(name); |
ccc901ee | 400 | if (b_ptr == NULL) { |
2cf8aa19 | 401 | pr_warn("Attempt to disable unknown bearer <%s>\n", name); |
ccc901ee | 402 | res = -EINVAL; |
28cc937e | 403 | } else { |
7d33939f | 404 | bearer_disable(b_ptr, false); |
28cc937e AS |
405 | res = 0; |
406 | } | |
4323add6 | 407 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
408 | return res; |
409 | } | |
410 | ||
e4d050cb YX |
411 | |
412 | /* tipc_l2_media_addr_set - initialize Ethernet media address structure | |
413 | * | |
414 | * Media-dependent "value" field stores MAC address in first 6 bytes | |
415 | * and zeroes out the remaining bytes. | |
416 | */ | |
417 | void tipc_l2_media_addr_set(const struct tipc_bearer *b, | |
418 | struct tipc_media_addr *a, char *mac) | |
419 | { | |
420 | int len = b->media->hwaddr_len; | |
421 | ||
422 | if (unlikely(sizeof(a->value) < len)) { | |
423 | WARN_ONCE(1, "Media length invalid\n"); | |
424 | return; | |
425 | } | |
426 | ||
427 | memcpy(a->value, mac, len); | |
428 | memset(a->value + len, 0, sizeof(a->value) - len); | |
429 | a->media_id = b->media->type_id; | |
430 | a->broadcast = !memcmp(mac, b->bcast_addr.value, len); | |
431 | } | |
432 | ||
433 | int tipc_enable_l2_media(struct tipc_bearer *b) | |
434 | { | |
435 | struct net_device *dev; | |
436 | char *driver_name = strchr((const char *)b->name, ':') + 1; | |
437 | ||
438 | /* Find device with specified name */ | |
439 | dev = dev_get_by_name(&init_net, driver_name); | |
440 | if (!dev) | |
441 | return -ENODEV; | |
442 | ||
443 | /* Associate TIPC bearer with Ethernet bearer */ | |
444 | b->media_ptr = dev; | |
445 | memset(b->bcast_addr.value, 0, sizeof(b->bcast_addr.value)); | |
446 | memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); | |
447 | b->bcast_addr.media_id = b->media->type_id; | |
448 | b->bcast_addr.broadcast = 1; | |
449 | b->mtu = dev->mtu; | |
450 | tipc_l2_media_addr_set(b, &b->addr, (char *)dev->dev_addr); | |
451 | rcu_assign_pointer(dev->tipc_ptr, b); | |
452 | return 0; | |
453 | } | |
454 | ||
455 | /* tipc_disable_l2_media - detach TIPC bearer from an Ethernet interface | |
456 | * | |
457 | * Mark Ethernet bearer as inactive so that incoming buffers are thrown away, | |
458 | * then get worker thread to complete bearer cleanup. (Can't do cleanup | |
459 | * here because cleanup code needs to sleep and caller holds spinlocks.) | |
460 | */ | |
461 | void tipc_disable_l2_media(struct tipc_bearer *b) | |
462 | { | |
463 | struct net_device *dev = (struct net_device *)b->media_ptr; | |
464 | RCU_INIT_POINTER(dev->tipc_ptr, NULL); | |
465 | dev_put(dev); | |
466 | } | |
467 | ||
468 | /** | |
469 | * tipc_l2_send_msg - send a TIPC packet out over an Ethernet interface | |
470 | * @buf: the packet to be sent | |
963a1855 | 471 | * @b_ptr: the bearer through which the packet is to be sent |
e4d050cb YX |
472 | * @dest: peer destination address |
473 | */ | |
474 | int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b, | |
475 | struct tipc_media_addr *dest) | |
476 | { | |
477 | struct sk_buff *clone; | |
478 | int delta; | |
479 | struct net_device *dev = (struct net_device *)b->media_ptr; | |
480 | ||
481 | clone = skb_clone(buf, GFP_ATOMIC); | |
482 | if (!clone) | |
483 | return 0; | |
484 | ||
485 | delta = dev->hard_header_len - skb_headroom(buf); | |
486 | if ((delta > 0) && | |
487 | pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { | |
488 | kfree_skb(clone); | |
489 | return 0; | |
490 | } | |
491 | ||
492 | skb_reset_network_header(clone); | |
493 | clone->dev = dev; | |
494 | clone->protocol = htons(ETH_P_TIPC); | |
495 | dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, | |
496 | dev->dev_addr, clone->len); | |
497 | dev_queue_xmit(clone); | |
498 | return 0; | |
499 | } | |
500 | ||
501 | /* tipc_bearer_send- sends buffer to destination over bearer | |
502 | * | |
503 | * IMPORTANT: | |
504 | * The media send routine must not alter the buffer being passed in | |
505 | * as it may be needed for later retransmission! | |
506 | */ | |
507 | void tipc_bearer_send(struct tipc_bearer *b, struct sk_buff *buf, | |
508 | struct tipc_media_addr *dest) | |
509 | { | |
510 | b->media->send_msg(buf, b, dest); | |
511 | } | |
512 | ||
6e967adf YX |
513 | /** |
514 | * tipc_l2_rcv_msg - handle incoming TIPC message from an interface | |
515 | * @buf: the received packet | |
516 | * @dev: the net device that the packet was received on | |
517 | * @pt: the packet_type structure which was used to register this handler | |
518 | * @orig_dev: the original receive net device in case the device is a bond | |
519 | * | |
520 | * Accept only packets explicitly sent to this node, or broadcast packets; | |
521 | * ignores packets sent using interface multicast, and traffic sent to other | |
522 | * nodes (which can happen if interface is running in promiscuous mode). | |
523 | */ | |
524 | static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev, | |
525 | struct packet_type *pt, struct net_device *orig_dev) | |
526 | { | |
527 | struct tipc_bearer *b_ptr; | |
528 | ||
529 | if (!net_eq(dev_net(dev), &init_net)) { | |
530 | kfree_skb(buf); | |
531 | return NET_RX_DROP; | |
532 | } | |
533 | ||
534 | rcu_read_lock(); | |
535 | b_ptr = rcu_dereference(dev->tipc_ptr); | |
536 | if (likely(b_ptr)) { | |
537 | if (likely(buf->pkt_type <= PACKET_BROADCAST)) { | |
538 | buf->next = NULL; | |
170b3927 | 539 | tipc_rcv(buf, b_ptr); |
6e967adf YX |
540 | rcu_read_unlock(); |
541 | return NET_RX_SUCCESS; | |
542 | } | |
543 | } | |
544 | rcu_read_unlock(); | |
545 | ||
546 | kfree_skb(buf); | |
547 | return NET_RX_DROP; | |
548 | } | |
549 | ||
550 | /** | |
551 | * tipc_l2_device_event - handle device events from network device | |
552 | * @nb: the context of the notification | |
553 | * @evt: the type of event | |
554 | * @ptr: the net device that the event was on | |
555 | * | |
556 | * This function is called by the Ethernet driver in case of link | |
557 | * change event. | |
558 | */ | |
559 | static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, | |
560 | void *ptr) | |
561 | { | |
562 | struct tipc_bearer *b_ptr; | |
563 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
b97bf3fd | 564 | |
6e967adf YX |
565 | if (!net_eq(dev_net(dev), &init_net)) |
566 | return NOTIFY_DONE; | |
567 | ||
568 | rcu_read_lock(); | |
569 | b_ptr = rcu_dereference(dev->tipc_ptr); | |
570 | if (!b_ptr) { | |
571 | rcu_read_unlock(); | |
572 | return NOTIFY_DONE; | |
573 | } | |
574 | ||
575 | b_ptr->mtu = dev->mtu; | |
576 | ||
577 | switch (evt) { | |
578 | case NETDEV_CHANGE: | |
579 | if (netif_carrier_ok(dev)) | |
580 | break; | |
581 | case NETDEV_DOWN: | |
582 | case NETDEV_CHANGEMTU: | |
583 | case NETDEV_CHANGEADDR: | |
584 | tipc_reset_bearer(b_ptr); | |
585 | break; | |
586 | case NETDEV_UNREGISTER: | |
587 | case NETDEV_CHANGENAME: | |
588 | tipc_disable_bearer(b_ptr->name); | |
589 | break; | |
590 | } | |
591 | rcu_read_unlock(); | |
592 | ||
593 | return NOTIFY_OK; | |
594 | } | |
595 | ||
596 | static struct packet_type tipc_packet_type __read_mostly = { | |
184593c7 | 597 | .type = htons(ETH_P_TIPC), |
6e967adf YX |
598 | .func = tipc_l2_rcv_msg, |
599 | }; | |
600 | ||
601 | static struct notifier_block notifier = { | |
602 | .notifier_call = tipc_l2_device_event, | |
603 | .priority = 0, | |
604 | }; | |
605 | ||
606 | int tipc_bearer_setup(void) | |
607 | { | |
970122fd YX |
608 | int err; |
609 | ||
610 | err = register_netdevice_notifier(¬ifier); | |
611 | if (err) | |
612 | return err; | |
6e967adf | 613 | dev_add_pack(&tipc_packet_type); |
970122fd | 614 | return 0; |
6e967adf YX |
615 | } |
616 | ||
617 | void tipc_bearer_cleanup(void) | |
618 | { | |
619 | unregister_netdevice_notifier(¬ifier); | |
620 | dev_remove_pack(&tipc_packet_type); | |
621 | } | |
b97bf3fd | 622 | |
4323add6 | 623 | void tipc_bearer_stop(void) |
b97bf3fd | 624 | { |
3874ccbb | 625 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
626 | u32 i; |
627 | ||
b97bf3fd | 628 | for (i = 0; i < MAX_BEARERS; i++) { |
3874ccbb | 629 | b_ptr = bearer_list[i]; |
f47de12b | 630 | if (b_ptr) { |
3874ccbb YX |
631 | bearer_disable(b_ptr, true); |
632 | bearer_list[i] = NULL; | |
633 | } | |
b97bf3fd | 634 | } |
b97bf3fd | 635 | } |