Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/bearer.c: TIPC bearer code | |
c4307285 | 3 | * |
593a5f22 | 4 | * Copyright (c) 1996-2006, Ericsson AB |
2d627b92 | 5 | * Copyright (c) 2004-2006, 2010-2011, 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 | ||
37 | #include "core.h" | |
38 | #include "config.h" | |
b97bf3fd | 39 | #include "bearer.h" |
b97bf3fd | 40 | #include "discover.h" |
b97bf3fd PL |
41 | |
42 | #define MAX_ADDR_STR 32 | |
43 | ||
d0021b25 | 44 | static struct media media_list[MAX_MEDIA]; |
e3ec9c7d | 45 | static u32 media_count; |
b97bf3fd | 46 | |
2d627b92 | 47 | struct tipc_bearer tipc_bearers[MAX_BEARERS]; |
b97bf3fd PL |
48 | |
49 | /** | |
50 | * media_name_valid - validate media name | |
c4307285 | 51 | * |
b97bf3fd PL |
52 | * Returns 1 if media name is valid, otherwise 0. |
53 | */ | |
54 | ||
55 | static int media_name_valid(const char *name) | |
56 | { | |
57 | u32 len; | |
58 | ||
59 | len = strlen(name); | |
60 | if ((len + 1) > TIPC_MAX_MEDIA_NAME) | |
61 | return 0; | |
a02cec21 | 62 | return strspn(name, tipc_alphabet) == len; |
b97bf3fd PL |
63 | } |
64 | ||
65 | /** | |
66 | * media_find - locates specified media object by name | |
67 | */ | |
68 | ||
69 | static struct media *media_find(const char *name) | |
70 | { | |
71 | struct media *m_ptr; | |
72 | u32 i; | |
73 | ||
74 | for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) { | |
75 | if (!strcmp(m_ptr->name, name)) | |
76 | return m_ptr; | |
77 | } | |
1fc54d8f | 78 | return NULL; |
b97bf3fd PL |
79 | } |
80 | ||
81 | /** | |
82 | * tipc_register_media - register a media type | |
c4307285 | 83 | * |
b97bf3fd PL |
84 | * Bearers for this media type must be activated separately at a later stage. |
85 | */ | |
86 | ||
87 | int tipc_register_media(u32 media_type, | |
c4307285 YH |
88 | char *name, |
89 | int (*enable)(struct tipc_bearer *), | |
90 | void (*disable)(struct tipc_bearer *), | |
91 | int (*send_msg)(struct sk_buff *, | |
b97bf3fd | 92 | struct tipc_bearer *, |
c4307285 | 93 | struct tipc_media_addr *), |
b97bf3fd PL |
94 | char *(*addr2str)(struct tipc_media_addr *a, |
95 | char *str_buf, int str_size), | |
96 | struct tipc_media_addr *bcast_addr, | |
97 | const u32 bearer_priority, | |
98 | const u32 link_tolerance, /* [ms] */ | |
99 | const u32 send_window_limit) | |
100 | { | |
101 | struct media *m_ptr; | |
102 | u32 media_id; | |
103 | u32 i; | |
104 | int res = -EINVAL; | |
105 | ||
4323add6 | 106 | write_lock_bh(&tipc_net_lock); |
b97bf3fd | 107 | |
d0021b25 NH |
108 | if (tipc_mode != TIPC_NET_MODE) { |
109 | warn("Media <%s> rejected, not in networked mode yet\n", name); | |
110 | goto exit; | |
111 | } | |
b97bf3fd | 112 | if (!media_name_valid(name)) { |
a10bd924 | 113 | warn("Media <%s> rejected, illegal name\n", name); |
b97bf3fd PL |
114 | goto exit; |
115 | } | |
116 | if (!bcast_addr) { | |
a10bd924 | 117 | warn("Media <%s> rejected, no broadcast address\n", name); |
b97bf3fd PL |
118 | goto exit; |
119 | } | |
b3df9a51 | 120 | if ((bearer_priority < TIPC_MIN_LINK_PRI) || |
16cb4b33 | 121 | (bearer_priority > TIPC_MAX_LINK_PRI)) { |
c4307285 | 122 | warn("Media <%s> rejected, illegal priority (%u)\n", name, |
a10bd924 | 123 | bearer_priority); |
b97bf3fd PL |
124 | goto exit; |
125 | } | |
c4307285 | 126 | if ((link_tolerance < TIPC_MIN_LINK_TOL) || |
b97bf3fd | 127 | (link_tolerance > TIPC_MAX_LINK_TOL)) { |
a10bd924 AS |
128 | warn("Media <%s> rejected, illegal tolerance (%u)\n", name, |
129 | link_tolerance); | |
b97bf3fd PL |
130 | goto exit; |
131 | } | |
132 | ||
133 | media_id = media_count++; | |
134 | if (media_id >= MAX_MEDIA) { | |
a10bd924 AS |
135 | warn("Media <%s> rejected, media limit reached (%u)\n", name, |
136 | MAX_MEDIA); | |
b97bf3fd PL |
137 | media_count--; |
138 | goto exit; | |
139 | } | |
140 | for (i = 0; i < media_id; i++) { | |
141 | if (media_list[i].type_id == media_type) { | |
a10bd924 | 142 | warn("Media <%s> rejected, duplicate type (%u)\n", name, |
b97bf3fd PL |
143 | media_type); |
144 | media_count--; | |
145 | goto exit; | |
146 | } | |
147 | if (!strcmp(name, media_list[i].name)) { | |
a10bd924 | 148 | warn("Media <%s> rejected, duplicate name\n", name); |
b97bf3fd PL |
149 | media_count--; |
150 | goto exit; | |
151 | } | |
152 | } | |
153 | ||
154 | m_ptr = &media_list[media_id]; | |
155 | m_ptr->type_id = media_type; | |
156 | m_ptr->send_msg = send_msg; | |
157 | m_ptr->enable_bearer = enable; | |
158 | m_ptr->disable_bearer = disable; | |
159 | m_ptr->addr2str = addr2str; | |
160 | memcpy(&m_ptr->bcast_addr, bcast_addr, sizeof(*bcast_addr)); | |
b97bf3fd PL |
161 | strcpy(m_ptr->name, name); |
162 | m_ptr->priority = bearer_priority; | |
163 | m_ptr->tolerance = link_tolerance; | |
164 | m_ptr->window = send_window_limit; | |
b97bf3fd PL |
165 | res = 0; |
166 | exit: | |
4323add6 | 167 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
168 | return res; |
169 | } | |
170 | ||
171 | /** | |
4323add6 | 172 | * tipc_media_addr_printf - record media address in print buffer |
b97bf3fd PL |
173 | */ |
174 | ||
4323add6 | 175 | void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a) |
b97bf3fd PL |
176 | { |
177 | struct media *m_ptr; | |
178 | u32 media_type; | |
179 | u32 i; | |
180 | ||
181 | media_type = ntohl(a->type); | |
182 | for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) { | |
183 | if (m_ptr->type_id == media_type) | |
184 | break; | |
185 | } | |
186 | ||
187 | if ((i < media_count) && (m_ptr->addr2str != NULL)) { | |
188 | char addr_str[MAX_ADDR_STR]; | |
189 | ||
e91ed0bc | 190 | tipc_printf(pb, "%s(%s)", m_ptr->name, |
b97bf3fd PL |
191 | m_ptr->addr2str(a, addr_str, sizeof(addr_str))); |
192 | } else { | |
193 | unchar *addr = (unchar *)&a->dev_addr; | |
194 | ||
e91ed0bc | 195 | tipc_printf(pb, "UNKNOWN(%u)", media_type); |
a016892c | 196 | for (i = 0; i < (sizeof(*a) - sizeof(a->type)); i++) |
e91ed0bc | 197 | tipc_printf(pb, "-%02x", addr[i]); |
b97bf3fd PL |
198 | } |
199 | } | |
200 | ||
201 | /** | |
4323add6 | 202 | * tipc_media_get_names - record names of registered media in buffer |
b97bf3fd PL |
203 | */ |
204 | ||
4323add6 | 205 | struct sk_buff *tipc_media_get_names(void) |
b97bf3fd PL |
206 | { |
207 | struct sk_buff *buf; | |
208 | struct media *m_ptr; | |
209 | int i; | |
210 | ||
4323add6 | 211 | buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME)); |
b97bf3fd PL |
212 | if (!buf) |
213 | return NULL; | |
214 | ||
4323add6 | 215 | read_lock_bh(&tipc_net_lock); |
b97bf3fd | 216 | for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) { |
c4307285 | 217 | tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, m_ptr->name, |
4323add6 | 218 | strlen(m_ptr->name) + 1); |
b97bf3fd | 219 | } |
4323add6 | 220 | read_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
221 | return buf; |
222 | } | |
223 | ||
224 | /** | |
225 | * bearer_name_validate - validate & (optionally) deconstruct bearer name | |
226 | * @name - ptr to bearer name string | |
227 | * @name_parts - ptr to area for bearer name components (or NULL if not needed) | |
c4307285 | 228 | * |
b97bf3fd PL |
229 | * Returns 1 if bearer name is valid, otherwise 0. |
230 | */ | |
231 | ||
c4307285 | 232 | static int bearer_name_validate(const char *name, |
b97bf3fd PL |
233 | struct bearer_name *name_parts) |
234 | { | |
235 | char name_copy[TIPC_MAX_BEARER_NAME]; | |
236 | char *media_name; | |
237 | char *if_name; | |
238 | u32 media_len; | |
239 | u32 if_len; | |
240 | ||
241 | /* copy bearer name & ensure length is OK */ | |
242 | ||
243 | name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; | |
244 | /* need above in case non-Posix strncpy() doesn't pad with nulls */ | |
245 | strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); | |
246 | if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) | |
247 | return 0; | |
248 | ||
249 | /* ensure all component parts of bearer name are present */ | |
250 | ||
251 | media_name = name_copy; | |
2db9983a AS |
252 | if_name = strchr(media_name, ':'); |
253 | if (if_name == NULL) | |
b97bf3fd PL |
254 | return 0; |
255 | *(if_name++) = 0; | |
256 | media_len = if_name - media_name; | |
257 | if_len = strlen(if_name) + 1; | |
258 | ||
259 | /* validate component parts of bearer name */ | |
260 | ||
c4307285 YH |
261 | if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || |
262 | (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) || | |
b97bf3fd PL |
263 | (strspn(media_name, tipc_alphabet) != (media_len - 1)) || |
264 | (strspn(if_name, tipc_alphabet) != (if_len - 1))) | |
265 | return 0; | |
266 | ||
267 | /* return bearer name components, if necessary */ | |
268 | ||
269 | if (name_parts) { | |
270 | strcpy(name_parts->media_name, media_name); | |
271 | strcpy(name_parts->if_name, if_name); | |
272 | } | |
273 | return 1; | |
274 | } | |
275 | ||
276 | /** | |
277 | * bearer_find - locates bearer object with matching bearer name | |
278 | */ | |
279 | ||
2d627b92 | 280 | static struct tipc_bearer *bearer_find(const char *name) |
b97bf3fd | 281 | { |
2d627b92 | 282 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
283 | u32 i; |
284 | ||
4323add6 | 285 | for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) { |
2d627b92 | 286 | if (b_ptr->active && (!strcmp(b_ptr->name, name))) |
b97bf3fd PL |
287 | return b_ptr; |
288 | } | |
1fc54d8f | 289 | return NULL; |
b97bf3fd PL |
290 | } |
291 | ||
292 | /** | |
4323add6 | 293 | * tipc_bearer_find_interface - locates bearer object with matching interface name |
b97bf3fd PL |
294 | */ |
295 | ||
2d627b92 | 296 | struct tipc_bearer *tipc_bearer_find_interface(const char *if_name) |
b97bf3fd | 297 | { |
2d627b92 | 298 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
299 | char *b_if_name; |
300 | u32 i; | |
301 | ||
4323add6 | 302 | for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) { |
b97bf3fd PL |
303 | if (!b_ptr->active) |
304 | continue; | |
2d627b92 | 305 | b_if_name = strchr(b_ptr->name, ':') + 1; |
b97bf3fd PL |
306 | if (!strcmp(b_if_name, if_name)) |
307 | return b_ptr; | |
308 | } | |
1fc54d8f | 309 | return NULL; |
b97bf3fd PL |
310 | } |
311 | ||
312 | /** | |
4323add6 | 313 | * tipc_bearer_get_names - record names of bearers in buffer |
b97bf3fd PL |
314 | */ |
315 | ||
4323add6 | 316 | struct sk_buff *tipc_bearer_get_names(void) |
b97bf3fd PL |
317 | { |
318 | struct sk_buff *buf; | |
319 | struct media *m_ptr; | |
2d627b92 | 320 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
321 | int i, j; |
322 | ||
4323add6 | 323 | buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME)); |
b97bf3fd PL |
324 | if (!buf) |
325 | return NULL; | |
326 | ||
4323add6 | 327 | read_lock_bh(&tipc_net_lock); |
b97bf3fd PL |
328 | for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) { |
329 | for (j = 0; j < MAX_BEARERS; j++) { | |
4323add6 | 330 | b_ptr = &tipc_bearers[j]; |
b97bf3fd | 331 | if (b_ptr->active && (b_ptr->media == m_ptr)) { |
c4307285 | 332 | tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME, |
2d627b92 AS |
333 | b_ptr->name, |
334 | strlen(b_ptr->name) + 1); | |
b97bf3fd PL |
335 | } |
336 | } | |
337 | } | |
4323add6 | 338 | read_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
339 | return buf; |
340 | } | |
341 | ||
2d627b92 | 342 | void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest) |
b97bf3fd | 343 | { |
4323add6 PL |
344 | tipc_nmap_add(&b_ptr->nodes, dest); |
345 | tipc_disc_update_link_req(b_ptr->link_req); | |
346 | tipc_bcbearer_sort(); | |
b97bf3fd PL |
347 | } |
348 | ||
2d627b92 | 349 | void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest) |
b97bf3fd | 350 | { |
4323add6 PL |
351 | tipc_nmap_remove(&b_ptr->nodes, dest); |
352 | tipc_disc_update_link_req(b_ptr->link_req); | |
353 | tipc_bcbearer_sort(); | |
b97bf3fd PL |
354 | } |
355 | ||
356 | /* | |
357 | * bearer_push(): Resolve bearer congestion. Force the waiting | |
358 | * links to push out their unsent packets, one packet per link | |
359 | * per iteration, until all packets are gone or congestion reoccurs. | |
4323add6 | 360 | * 'tipc_net_lock' is read_locked when this function is called |
b97bf3fd PL |
361 | * bearer.lock must be taken before calling |
362 | * Returns binary true(1) ore false(0) | |
363 | */ | |
2d627b92 | 364 | static int bearer_push(struct tipc_bearer *b_ptr) |
b97bf3fd | 365 | { |
0e35fd5e | 366 | u32 res = 0; |
b97bf3fd PL |
367 | struct link *ln, *tln; |
368 | ||
2d627b92 | 369 | if (b_ptr->blocked) |
b97bf3fd PL |
370 | return 0; |
371 | ||
372 | while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) { | |
373 | list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) { | |
4323add6 | 374 | res = tipc_link_push_packet(ln); |
b97bf3fd PL |
375 | if (res == PUSH_FAILED) |
376 | break; | |
377 | if (res == PUSH_FINISHED) | |
378 | list_move_tail(&ln->link_list, &b_ptr->links); | |
379 | } | |
380 | } | |
381 | return list_empty(&b_ptr->cong_links); | |
382 | } | |
383 | ||
2d627b92 | 384 | void tipc_bearer_lock_push(struct tipc_bearer *b_ptr) |
b97bf3fd PL |
385 | { |
386 | int res; | |
387 | ||
2d627b92 | 388 | spin_lock_bh(&b_ptr->lock); |
b97bf3fd | 389 | res = bearer_push(b_ptr); |
2d627b92 | 390 | spin_unlock_bh(&b_ptr->lock); |
b97bf3fd | 391 | if (res) |
4323add6 | 392 | tipc_bcbearer_push(); |
b97bf3fd PL |
393 | } |
394 | ||
395 | ||
396 | /* | |
c4307285 YH |
397 | * Interrupt enabling new requests after bearer congestion or blocking: |
398 | * See bearer_send(). | |
b97bf3fd | 399 | */ |
2d627b92 | 400 | void tipc_continue(struct tipc_bearer *b_ptr) |
b97bf3fd | 401 | { |
2d627b92 | 402 | spin_lock_bh(&b_ptr->lock); |
b97bf3fd PL |
403 | b_ptr->continue_count++; |
404 | if (!list_empty(&b_ptr->cong_links)) | |
4323add6 | 405 | tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr); |
2d627b92 AS |
406 | b_ptr->blocked = 0; |
407 | spin_unlock_bh(&b_ptr->lock); | |
b97bf3fd PL |
408 | } |
409 | ||
410 | /* | |
c4307285 YH |
411 | * Schedule link for sending of messages after the bearer |
412 | * has been deblocked by 'continue()'. This method is called | |
413 | * when somebody tries to send a message via this link while | |
4323add6 | 414 | * the bearer is congested. 'tipc_net_lock' is in read_lock here |
b97bf3fd PL |
415 | * bearer.lock is busy |
416 | */ | |
417 | ||
2d627b92 | 418 | static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b97bf3fd PL |
419 | { |
420 | list_move_tail(&l_ptr->link_list, &b_ptr->cong_links); | |
421 | } | |
422 | ||
423 | /* | |
c4307285 YH |
424 | * Schedule link for sending of messages after the bearer |
425 | * has been deblocked by 'continue()'. This method is called | |
426 | * when somebody tries to send a message via this link while | |
4323add6 | 427 | * the bearer is congested. 'tipc_net_lock' is in read_lock here, |
b97bf3fd PL |
428 | * bearer.lock is free |
429 | */ | |
430 | ||
2d627b92 | 431 | void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b97bf3fd | 432 | { |
2d627b92 | 433 | spin_lock_bh(&b_ptr->lock); |
4323add6 | 434 | tipc_bearer_schedule_unlocked(b_ptr, l_ptr); |
2d627b92 | 435 | spin_unlock_bh(&b_ptr->lock); |
b97bf3fd PL |
436 | } |
437 | ||
438 | ||
439 | /* | |
4323add6 | 440 | * tipc_bearer_resolve_congestion(): Check if there is bearer congestion, |
b97bf3fd | 441 | * and if there is, try to resolve it before returning. |
4323add6 | 442 | * 'tipc_net_lock' is read_locked when this function is called |
b97bf3fd | 443 | */ |
2d627b92 | 444 | int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b97bf3fd PL |
445 | { |
446 | int res = 1; | |
447 | ||
448 | if (list_empty(&b_ptr->cong_links)) | |
449 | return 1; | |
2d627b92 | 450 | spin_lock_bh(&b_ptr->lock); |
b97bf3fd | 451 | if (!bearer_push(b_ptr)) { |
4323add6 | 452 | tipc_bearer_schedule_unlocked(b_ptr, l_ptr); |
b97bf3fd PL |
453 | res = 0; |
454 | } | |
2d627b92 | 455 | spin_unlock_bh(&b_ptr->lock); |
b97bf3fd PL |
456 | return res; |
457 | } | |
458 | ||
b274f4ab AS |
459 | /** |
460 | * tipc_bearer_congested - determines if bearer is currently congested | |
461 | */ | |
462 | ||
2d627b92 | 463 | int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b274f4ab | 464 | { |
2d627b92 | 465 | if (unlikely(b_ptr->blocked)) |
b274f4ab AS |
466 | return 1; |
467 | if (likely(list_empty(&b_ptr->cong_links))) | |
468 | return 0; | |
469 | return !tipc_bearer_resolve_congestion(b_ptr, l_ptr); | |
470 | } | |
b97bf3fd PL |
471 | |
472 | /** | |
473 | * tipc_enable_bearer - enable bearer with the given name | |
c4307285 | 474 | */ |
b97bf3fd | 475 | |
50d3e639 | 476 | int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority) |
b97bf3fd | 477 | { |
2d627b92 | 478 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
479 | struct media *m_ptr; |
480 | struct bearer_name b_name; | |
481 | char addr_string[16]; | |
482 | u32 bearer_id; | |
483 | u32 with_this_prio; | |
484 | u32 i; | |
485 | int res = -EINVAL; | |
486 | ||
a10bd924 AS |
487 | if (tipc_mode != TIPC_NET_MODE) { |
488 | warn("Bearer <%s> rejected, not supported in standalone mode\n", | |
489 | name); | |
b97bf3fd | 490 | return -ENOPROTOOPT; |
a10bd924 AS |
491 | } |
492 | if (!bearer_name_validate(name, &b_name)) { | |
493 | warn("Bearer <%s> rejected, illegal name\n", name); | |
16cb4b33 | 494 | return -EINVAL; |
a10bd924 | 495 | } |
50d3e639 AS |
496 | if (!tipc_addr_domain_valid(disc_domain) || |
497 | !tipc_in_scope(disc_domain, tipc_own_addr)) { | |
498 | warn("Bearer <%s> rejected, illegal discovery domain\n", name); | |
a10bd924 AS |
499 | return -EINVAL; |
500 | } | |
16cb4b33 PL |
501 | if ((priority < TIPC_MIN_LINK_PRI || |
502 | priority > TIPC_MAX_LINK_PRI) && | |
a10bd924 AS |
503 | (priority != TIPC_MEDIA_LINK_PRI)) { |
504 | warn("Bearer <%s> rejected, illegal priority\n", name); | |
b97bf3fd | 505 | return -EINVAL; |
a10bd924 | 506 | } |
b97bf3fd | 507 | |
4323add6 | 508 | write_lock_bh(&tipc_net_lock); |
b97bf3fd PL |
509 | |
510 | m_ptr = media_find(b_name.media_name); | |
511 | if (!m_ptr) { | |
a10bd924 AS |
512 | warn("Bearer <%s> rejected, media <%s> not registered\n", name, |
513 | b_name.media_name); | |
b97bf3fd PL |
514 | goto failed; |
515 | } | |
16cb4b33 PL |
516 | |
517 | if (priority == TIPC_MEDIA_LINK_PRI) | |
b97bf3fd PL |
518 | priority = m_ptr->priority; |
519 | ||
520 | restart: | |
521 | bearer_id = MAX_BEARERS; | |
522 | with_this_prio = 1; | |
523 | for (i = MAX_BEARERS; i-- != 0; ) { | |
4323add6 | 524 | if (!tipc_bearers[i].active) { |
b97bf3fd PL |
525 | bearer_id = i; |
526 | continue; | |
527 | } | |
2d627b92 | 528 | if (!strcmp(name, tipc_bearers[i].name)) { |
a10bd924 | 529 | warn("Bearer <%s> rejected, already enabled\n", name); |
b97bf3fd PL |
530 | goto failed; |
531 | } | |
4323add6 | 532 | if ((tipc_bearers[i].priority == priority) && |
b97bf3fd PL |
533 | (++with_this_prio > 2)) { |
534 | if (priority-- == 0) { | |
a10bd924 AS |
535 | warn("Bearer <%s> rejected, duplicate priority\n", |
536 | name); | |
b97bf3fd PL |
537 | goto failed; |
538 | } | |
a10bd924 | 539 | warn("Bearer <%s> priority adjustment required %u->%u\n", |
b97bf3fd PL |
540 | name, priority + 1, priority); |
541 | goto restart; | |
542 | } | |
543 | } | |
544 | if (bearer_id >= MAX_BEARERS) { | |
c4307285 | 545 | warn("Bearer <%s> rejected, bearer limit reached (%u)\n", |
a10bd924 | 546 | name, MAX_BEARERS); |
b97bf3fd PL |
547 | goto failed; |
548 | } | |
549 | ||
4323add6 | 550 | b_ptr = &tipc_bearers[bearer_id]; |
2d627b92 AS |
551 | strcpy(b_ptr->name, name); |
552 | res = m_ptr->enable_bearer(b_ptr); | |
b97bf3fd | 553 | if (res) { |
a10bd924 | 554 | warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res); |
b97bf3fd PL |
555 | goto failed; |
556 | } | |
557 | ||
558 | b_ptr->identity = bearer_id; | |
559 | b_ptr->media = m_ptr; | |
560 | b_ptr->net_plane = bearer_id + 'A'; | |
561 | b_ptr->active = 1; | |
b97bf3fd PL |
562 | b_ptr->priority = priority; |
563 | INIT_LIST_HEAD(&b_ptr->cong_links); | |
564 | INIT_LIST_HEAD(&b_ptr->links); | |
50d49232 AS |
565 | b_ptr->link_req = tipc_disc_init_link_req(b_ptr, &m_ptr->bcast_addr, |
566 | disc_domain); | |
2d627b92 | 567 | spin_lock_init(&b_ptr->lock); |
4323add6 | 568 | write_unlock_bh(&tipc_net_lock); |
16cb4b33 | 569 | info("Enabled bearer <%s>, discovery domain %s, priority %u\n", |
50d3e639 | 570 | name, tipc_addr_string_fill(addr_string, disc_domain), priority); |
b97bf3fd PL |
571 | return 0; |
572 | failed: | |
4323add6 | 573 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
574 | return res; |
575 | } | |
576 | ||
577 | /** | |
578 | * tipc_block_bearer(): Block the bearer with the given name, | |
579 | * and reset all its links | |
580 | */ | |
581 | ||
582 | int tipc_block_bearer(const char *name) | |
583 | { | |
2d627b92 | 584 | struct tipc_bearer *b_ptr = NULL; |
b97bf3fd PL |
585 | struct link *l_ptr; |
586 | struct link *temp_l_ptr; | |
587 | ||
4323add6 | 588 | read_lock_bh(&tipc_net_lock); |
b97bf3fd PL |
589 | b_ptr = bearer_find(name); |
590 | if (!b_ptr) { | |
591 | warn("Attempt to block unknown bearer <%s>\n", name); | |
4323add6 | 592 | read_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
593 | return -EINVAL; |
594 | } | |
595 | ||
a10bd924 | 596 | info("Blocking bearer <%s>\n", name); |
2d627b92 AS |
597 | spin_lock_bh(&b_ptr->lock); |
598 | b_ptr->blocked = 1; | |
b97bf3fd | 599 | list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { |
6c00055a | 600 | struct tipc_node *n_ptr = l_ptr->owner; |
b97bf3fd PL |
601 | |
602 | spin_lock_bh(&n_ptr->lock); | |
4323add6 | 603 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
604 | spin_unlock_bh(&n_ptr->lock); |
605 | } | |
2d627b92 | 606 | spin_unlock_bh(&b_ptr->lock); |
4323add6 | 607 | read_unlock_bh(&tipc_net_lock); |
0e35fd5e | 608 | return 0; |
b97bf3fd PL |
609 | } |
610 | ||
611 | /** | |
612 | * bearer_disable - | |
c4307285 | 613 | * |
4323add6 | 614 | * Note: This routine assumes caller holds tipc_net_lock. |
b97bf3fd PL |
615 | */ |
616 | ||
2d627b92 | 617 | static void bearer_disable(struct tipc_bearer *b_ptr) |
b97bf3fd | 618 | { |
b97bf3fd PL |
619 | struct link *l_ptr; |
620 | struct link *temp_l_ptr; | |
621 | ||
2d627b92 | 622 | info("Disabling bearer <%s>\n", b_ptr->name); |
4323add6 | 623 | tipc_disc_stop_link_req(b_ptr->link_req); |
2d627b92 | 624 | spin_lock_bh(&b_ptr->lock); |
b97bf3fd | 625 | b_ptr->link_req = NULL; |
2d627b92 AS |
626 | b_ptr->blocked = 1; |
627 | b_ptr->media->disable_bearer(b_ptr); | |
b97bf3fd | 628 | list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { |
4323add6 | 629 | tipc_link_delete(l_ptr); |
b97bf3fd | 630 | } |
2d627b92 AS |
631 | spin_unlock_bh(&b_ptr->lock); |
632 | memset(b_ptr, 0, sizeof(struct tipc_bearer)); | |
b97bf3fd PL |
633 | } |
634 | ||
635 | int tipc_disable_bearer(const char *name) | |
636 | { | |
2d627b92 | 637 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
638 | int res; |
639 | ||
4323add6 | 640 | write_lock_bh(&tipc_net_lock); |
ccc901ee AS |
641 | b_ptr = bearer_find(name); |
642 | if (b_ptr == NULL) { | |
643 | warn("Attempt to disable unknown bearer <%s>\n", name); | |
644 | res = -EINVAL; | |
28cc937e AS |
645 | } else { |
646 | bearer_disable(b_ptr); | |
647 | res = 0; | |
648 | } | |
4323add6 | 649 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
650 | return res; |
651 | } | |
652 | ||
653 | ||
654 | ||
4323add6 | 655 | void tipc_bearer_stop(void) |
b97bf3fd PL |
656 | { |
657 | u32 i; | |
658 | ||
b97bf3fd | 659 | for (i = 0; i < MAX_BEARERS; i++) { |
4323add6 | 660 | if (tipc_bearers[i].active) |
ccc901ee | 661 | bearer_disable(&tipc_bearers[i]); |
b97bf3fd | 662 | } |
b97bf3fd PL |
663 | media_count = 0; |
664 | } |