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)); | |
161 | m_ptr->bcast = 1; | |
162 | strcpy(m_ptr->name, name); | |
163 | m_ptr->priority = bearer_priority; | |
164 | m_ptr->tolerance = link_tolerance; | |
165 | m_ptr->window = send_window_limit; | |
b97bf3fd PL |
166 | res = 0; |
167 | exit: | |
4323add6 | 168 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
169 | return res; |
170 | } | |
171 | ||
172 | /** | |
4323add6 | 173 | * tipc_media_addr_printf - record media address in print buffer |
b97bf3fd PL |
174 | */ |
175 | ||
4323add6 | 176 | void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a) |
b97bf3fd PL |
177 | { |
178 | struct media *m_ptr; | |
179 | u32 media_type; | |
180 | u32 i; | |
181 | ||
182 | media_type = ntohl(a->type); | |
183 | for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) { | |
184 | if (m_ptr->type_id == media_type) | |
185 | break; | |
186 | } | |
187 | ||
188 | if ((i < media_count) && (m_ptr->addr2str != NULL)) { | |
189 | char addr_str[MAX_ADDR_STR]; | |
190 | ||
e91ed0bc | 191 | tipc_printf(pb, "%s(%s)", m_ptr->name, |
b97bf3fd PL |
192 | m_ptr->addr2str(a, addr_str, sizeof(addr_str))); |
193 | } else { | |
194 | unchar *addr = (unchar *)&a->dev_addr; | |
195 | ||
e91ed0bc | 196 | tipc_printf(pb, "UNKNOWN(%u)", media_type); |
a016892c | 197 | for (i = 0; i < (sizeof(*a) - sizeof(a->type)); i++) |
e91ed0bc | 198 | tipc_printf(pb, "-%02x", addr[i]); |
b97bf3fd PL |
199 | } |
200 | } | |
201 | ||
202 | /** | |
4323add6 | 203 | * tipc_media_get_names - record names of registered media in buffer |
b97bf3fd PL |
204 | */ |
205 | ||
4323add6 | 206 | struct sk_buff *tipc_media_get_names(void) |
b97bf3fd PL |
207 | { |
208 | struct sk_buff *buf; | |
209 | struct media *m_ptr; | |
210 | int i; | |
211 | ||
4323add6 | 212 | buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME)); |
b97bf3fd PL |
213 | if (!buf) |
214 | return NULL; | |
215 | ||
4323add6 | 216 | read_lock_bh(&tipc_net_lock); |
b97bf3fd | 217 | for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) { |
c4307285 | 218 | tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, m_ptr->name, |
4323add6 | 219 | strlen(m_ptr->name) + 1); |
b97bf3fd | 220 | } |
4323add6 | 221 | read_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
222 | return buf; |
223 | } | |
224 | ||
225 | /** | |
226 | * bearer_name_validate - validate & (optionally) deconstruct bearer name | |
227 | * @name - ptr to bearer name string | |
228 | * @name_parts - ptr to area for bearer name components (or NULL if not needed) | |
c4307285 | 229 | * |
b97bf3fd PL |
230 | * Returns 1 if bearer name is valid, otherwise 0. |
231 | */ | |
232 | ||
c4307285 | 233 | static int bearer_name_validate(const char *name, |
b97bf3fd PL |
234 | struct bearer_name *name_parts) |
235 | { | |
236 | char name_copy[TIPC_MAX_BEARER_NAME]; | |
237 | char *media_name; | |
238 | char *if_name; | |
239 | u32 media_len; | |
240 | u32 if_len; | |
241 | ||
242 | /* copy bearer name & ensure length is OK */ | |
243 | ||
244 | name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; | |
245 | /* need above in case non-Posix strncpy() doesn't pad with nulls */ | |
246 | strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); | |
247 | if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) | |
248 | return 0; | |
249 | ||
250 | /* ensure all component parts of bearer name are present */ | |
251 | ||
252 | media_name = name_copy; | |
2db9983a AS |
253 | if_name = strchr(media_name, ':'); |
254 | if (if_name == NULL) | |
b97bf3fd PL |
255 | return 0; |
256 | *(if_name++) = 0; | |
257 | media_len = if_name - media_name; | |
258 | if_len = strlen(if_name) + 1; | |
259 | ||
260 | /* validate component parts of bearer name */ | |
261 | ||
c4307285 YH |
262 | if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || |
263 | (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) || | |
b97bf3fd PL |
264 | (strspn(media_name, tipc_alphabet) != (media_len - 1)) || |
265 | (strspn(if_name, tipc_alphabet) != (if_len - 1))) | |
266 | return 0; | |
267 | ||
268 | /* return bearer name components, if necessary */ | |
269 | ||
270 | if (name_parts) { | |
271 | strcpy(name_parts->media_name, media_name); | |
272 | strcpy(name_parts->if_name, if_name); | |
273 | } | |
274 | return 1; | |
275 | } | |
276 | ||
277 | /** | |
278 | * bearer_find - locates bearer object with matching bearer name | |
279 | */ | |
280 | ||
2d627b92 | 281 | static struct tipc_bearer *bearer_find(const char *name) |
b97bf3fd | 282 | { |
2d627b92 | 283 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
284 | u32 i; |
285 | ||
4323add6 | 286 | for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) { |
2d627b92 | 287 | if (b_ptr->active && (!strcmp(b_ptr->name, name))) |
b97bf3fd PL |
288 | return b_ptr; |
289 | } | |
1fc54d8f | 290 | return NULL; |
b97bf3fd PL |
291 | } |
292 | ||
293 | /** | |
4323add6 | 294 | * tipc_bearer_find_interface - locates bearer object with matching interface name |
b97bf3fd PL |
295 | */ |
296 | ||
2d627b92 | 297 | struct tipc_bearer *tipc_bearer_find_interface(const char *if_name) |
b97bf3fd | 298 | { |
2d627b92 | 299 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
300 | char *b_if_name; |
301 | u32 i; | |
302 | ||
4323add6 | 303 | for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) { |
b97bf3fd PL |
304 | if (!b_ptr->active) |
305 | continue; | |
2d627b92 | 306 | b_if_name = strchr(b_ptr->name, ':') + 1; |
b97bf3fd PL |
307 | if (!strcmp(b_if_name, if_name)) |
308 | return b_ptr; | |
309 | } | |
1fc54d8f | 310 | return NULL; |
b97bf3fd PL |
311 | } |
312 | ||
313 | /** | |
4323add6 | 314 | * tipc_bearer_get_names - record names of bearers in buffer |
b97bf3fd PL |
315 | */ |
316 | ||
4323add6 | 317 | struct sk_buff *tipc_bearer_get_names(void) |
b97bf3fd PL |
318 | { |
319 | struct sk_buff *buf; | |
320 | struct media *m_ptr; | |
2d627b92 | 321 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
322 | int i, j; |
323 | ||
4323add6 | 324 | buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME)); |
b97bf3fd PL |
325 | if (!buf) |
326 | return NULL; | |
327 | ||
4323add6 | 328 | read_lock_bh(&tipc_net_lock); |
b97bf3fd PL |
329 | for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) { |
330 | for (j = 0; j < MAX_BEARERS; j++) { | |
4323add6 | 331 | b_ptr = &tipc_bearers[j]; |
b97bf3fd | 332 | if (b_ptr->active && (b_ptr->media == m_ptr)) { |
c4307285 | 333 | tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME, |
2d627b92 AS |
334 | b_ptr->name, |
335 | strlen(b_ptr->name) + 1); | |
b97bf3fd PL |
336 | } |
337 | } | |
338 | } | |
4323add6 | 339 | read_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
340 | return buf; |
341 | } | |
342 | ||
2d627b92 | 343 | void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest) |
b97bf3fd | 344 | { |
4323add6 PL |
345 | tipc_nmap_add(&b_ptr->nodes, dest); |
346 | tipc_disc_update_link_req(b_ptr->link_req); | |
347 | tipc_bcbearer_sort(); | |
b97bf3fd PL |
348 | } |
349 | ||
2d627b92 | 350 | void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest) |
b97bf3fd | 351 | { |
4323add6 PL |
352 | tipc_nmap_remove(&b_ptr->nodes, dest); |
353 | tipc_disc_update_link_req(b_ptr->link_req); | |
354 | tipc_bcbearer_sort(); | |
b97bf3fd PL |
355 | } |
356 | ||
357 | /* | |
358 | * bearer_push(): Resolve bearer congestion. Force the waiting | |
359 | * links to push out their unsent packets, one packet per link | |
360 | * per iteration, until all packets are gone or congestion reoccurs. | |
4323add6 | 361 | * 'tipc_net_lock' is read_locked when this function is called |
b97bf3fd PL |
362 | * bearer.lock must be taken before calling |
363 | * Returns binary true(1) ore false(0) | |
364 | */ | |
2d627b92 | 365 | static int bearer_push(struct tipc_bearer *b_ptr) |
b97bf3fd | 366 | { |
0e35fd5e | 367 | u32 res = 0; |
b97bf3fd PL |
368 | struct link *ln, *tln; |
369 | ||
2d627b92 | 370 | if (b_ptr->blocked) |
b97bf3fd PL |
371 | return 0; |
372 | ||
373 | while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) { | |
374 | list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) { | |
4323add6 | 375 | res = tipc_link_push_packet(ln); |
b97bf3fd PL |
376 | if (res == PUSH_FAILED) |
377 | break; | |
378 | if (res == PUSH_FINISHED) | |
379 | list_move_tail(&ln->link_list, &b_ptr->links); | |
380 | } | |
381 | } | |
382 | return list_empty(&b_ptr->cong_links); | |
383 | } | |
384 | ||
2d627b92 | 385 | void tipc_bearer_lock_push(struct tipc_bearer *b_ptr) |
b97bf3fd PL |
386 | { |
387 | int res; | |
388 | ||
2d627b92 | 389 | spin_lock_bh(&b_ptr->lock); |
b97bf3fd | 390 | res = bearer_push(b_ptr); |
2d627b92 | 391 | spin_unlock_bh(&b_ptr->lock); |
b97bf3fd | 392 | if (res) |
4323add6 | 393 | tipc_bcbearer_push(); |
b97bf3fd PL |
394 | } |
395 | ||
396 | ||
397 | /* | |
c4307285 YH |
398 | * Interrupt enabling new requests after bearer congestion or blocking: |
399 | * See bearer_send(). | |
b97bf3fd | 400 | */ |
2d627b92 | 401 | void tipc_continue(struct tipc_bearer *b_ptr) |
b97bf3fd | 402 | { |
2d627b92 | 403 | spin_lock_bh(&b_ptr->lock); |
b97bf3fd PL |
404 | b_ptr->continue_count++; |
405 | if (!list_empty(&b_ptr->cong_links)) | |
4323add6 | 406 | tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr); |
2d627b92 AS |
407 | b_ptr->blocked = 0; |
408 | spin_unlock_bh(&b_ptr->lock); | |
b97bf3fd PL |
409 | } |
410 | ||
411 | /* | |
c4307285 YH |
412 | * Schedule link for sending of messages after the bearer |
413 | * has been deblocked by 'continue()'. This method is called | |
414 | * when somebody tries to send a message via this link while | |
4323add6 | 415 | * the bearer is congested. 'tipc_net_lock' is in read_lock here |
b97bf3fd PL |
416 | * bearer.lock is busy |
417 | */ | |
418 | ||
2d627b92 | 419 | static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b97bf3fd PL |
420 | { |
421 | list_move_tail(&l_ptr->link_list, &b_ptr->cong_links); | |
422 | } | |
423 | ||
424 | /* | |
c4307285 YH |
425 | * Schedule link for sending of messages after the bearer |
426 | * has been deblocked by 'continue()'. This method is called | |
427 | * when somebody tries to send a message via this link while | |
4323add6 | 428 | * the bearer is congested. 'tipc_net_lock' is in read_lock here, |
b97bf3fd PL |
429 | * bearer.lock is free |
430 | */ | |
431 | ||
2d627b92 | 432 | void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b97bf3fd | 433 | { |
2d627b92 | 434 | spin_lock_bh(&b_ptr->lock); |
4323add6 | 435 | tipc_bearer_schedule_unlocked(b_ptr, l_ptr); |
2d627b92 | 436 | spin_unlock_bh(&b_ptr->lock); |
b97bf3fd PL |
437 | } |
438 | ||
439 | ||
440 | /* | |
4323add6 | 441 | * tipc_bearer_resolve_congestion(): Check if there is bearer congestion, |
b97bf3fd | 442 | * and if there is, try to resolve it before returning. |
4323add6 | 443 | * 'tipc_net_lock' is read_locked when this function is called |
b97bf3fd | 444 | */ |
2d627b92 | 445 | int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b97bf3fd PL |
446 | { |
447 | int res = 1; | |
448 | ||
449 | if (list_empty(&b_ptr->cong_links)) | |
450 | return 1; | |
2d627b92 | 451 | spin_lock_bh(&b_ptr->lock); |
b97bf3fd | 452 | if (!bearer_push(b_ptr)) { |
4323add6 | 453 | tipc_bearer_schedule_unlocked(b_ptr, l_ptr); |
b97bf3fd PL |
454 | res = 0; |
455 | } | |
2d627b92 | 456 | spin_unlock_bh(&b_ptr->lock); |
b97bf3fd PL |
457 | return res; |
458 | } | |
459 | ||
b274f4ab AS |
460 | /** |
461 | * tipc_bearer_congested - determines if bearer is currently congested | |
462 | */ | |
463 | ||
2d627b92 | 464 | int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b274f4ab | 465 | { |
2d627b92 | 466 | if (unlikely(b_ptr->blocked)) |
b274f4ab AS |
467 | return 1; |
468 | if (likely(list_empty(&b_ptr->cong_links))) | |
469 | return 0; | |
470 | return !tipc_bearer_resolve_congestion(b_ptr, l_ptr); | |
471 | } | |
b97bf3fd PL |
472 | |
473 | /** | |
474 | * tipc_enable_bearer - enable bearer with the given name | |
c4307285 | 475 | */ |
b97bf3fd PL |
476 | |
477 | int tipc_enable_bearer(const char *name, u32 bcast_scope, u32 priority) | |
478 | { | |
2d627b92 | 479 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
480 | struct media *m_ptr; |
481 | struct bearer_name b_name; | |
482 | char addr_string[16]; | |
483 | u32 bearer_id; | |
484 | u32 with_this_prio; | |
485 | u32 i; | |
486 | int res = -EINVAL; | |
487 | ||
a10bd924 AS |
488 | if (tipc_mode != TIPC_NET_MODE) { |
489 | warn("Bearer <%s> rejected, not supported in standalone mode\n", | |
490 | name); | |
b97bf3fd | 491 | return -ENOPROTOOPT; |
a10bd924 AS |
492 | } |
493 | if (!bearer_name_validate(name, &b_name)) { | |
494 | warn("Bearer <%s> rejected, illegal name\n", name); | |
16cb4b33 | 495 | return -EINVAL; |
a10bd924 | 496 | } |
c4307285 | 497 | if (!tipc_addr_domain_valid(bcast_scope) || |
c68ca7b7 | 498 | !tipc_in_scope(bcast_scope, tipc_own_addr)) { |
a10bd924 AS |
499 | warn("Bearer <%s> rejected, illegal broadcast scope\n", name); |
500 | return -EINVAL; | |
501 | } | |
16cb4b33 PL |
502 | if ((priority < TIPC_MIN_LINK_PRI || |
503 | priority > TIPC_MAX_LINK_PRI) && | |
a10bd924 AS |
504 | (priority != TIPC_MEDIA_LINK_PRI)) { |
505 | warn("Bearer <%s> rejected, illegal priority\n", name); | |
b97bf3fd | 506 | return -EINVAL; |
a10bd924 | 507 | } |
b97bf3fd | 508 | |
4323add6 | 509 | write_lock_bh(&tipc_net_lock); |
b97bf3fd PL |
510 | |
511 | m_ptr = media_find(b_name.media_name); | |
512 | if (!m_ptr) { | |
a10bd924 AS |
513 | warn("Bearer <%s> rejected, media <%s> not registered\n", name, |
514 | b_name.media_name); | |
b97bf3fd PL |
515 | goto failed; |
516 | } | |
16cb4b33 PL |
517 | |
518 | if (priority == TIPC_MEDIA_LINK_PRI) | |
b97bf3fd PL |
519 | priority = m_ptr->priority; |
520 | ||
521 | restart: | |
522 | bearer_id = MAX_BEARERS; | |
523 | with_this_prio = 1; | |
524 | for (i = MAX_BEARERS; i-- != 0; ) { | |
4323add6 | 525 | if (!tipc_bearers[i].active) { |
b97bf3fd PL |
526 | bearer_id = i; |
527 | continue; | |
528 | } | |
2d627b92 | 529 | if (!strcmp(name, tipc_bearers[i].name)) { |
a10bd924 | 530 | warn("Bearer <%s> rejected, already enabled\n", name); |
b97bf3fd PL |
531 | goto failed; |
532 | } | |
4323add6 | 533 | if ((tipc_bearers[i].priority == priority) && |
b97bf3fd PL |
534 | (++with_this_prio > 2)) { |
535 | if (priority-- == 0) { | |
a10bd924 AS |
536 | warn("Bearer <%s> rejected, duplicate priority\n", |
537 | name); | |
b97bf3fd PL |
538 | goto failed; |
539 | } | |
a10bd924 | 540 | warn("Bearer <%s> priority adjustment required %u->%u\n", |
b97bf3fd PL |
541 | name, priority + 1, priority); |
542 | goto restart; | |
543 | } | |
544 | } | |
545 | if (bearer_id >= MAX_BEARERS) { | |
c4307285 | 546 | warn("Bearer <%s> rejected, bearer limit reached (%u)\n", |
a10bd924 | 547 | name, MAX_BEARERS); |
b97bf3fd PL |
548 | goto failed; |
549 | } | |
550 | ||
4323add6 | 551 | b_ptr = &tipc_bearers[bearer_id]; |
2d627b92 AS |
552 | strcpy(b_ptr->name, name); |
553 | res = m_ptr->enable_bearer(b_ptr); | |
b97bf3fd | 554 | if (res) { |
a10bd924 | 555 | warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res); |
b97bf3fd PL |
556 | goto failed; |
557 | } | |
558 | ||
559 | b_ptr->identity = bearer_id; | |
560 | b_ptr->media = m_ptr; | |
561 | b_ptr->net_plane = bearer_id + 'A'; | |
562 | b_ptr->active = 1; | |
563 | b_ptr->detect_scope = bcast_scope; | |
564 | b_ptr->priority = priority; | |
565 | INIT_LIST_HEAD(&b_ptr->cong_links); | |
566 | INIT_LIST_HEAD(&b_ptr->links); | |
567 | if (m_ptr->bcast) { | |
4323add6 | 568 | b_ptr->link_req = tipc_disc_init_link_req(b_ptr, &m_ptr->bcast_addr, |
2e07dda1 | 569 | bcast_scope); |
b97bf3fd | 570 | } |
2d627b92 | 571 | spin_lock_init(&b_ptr->lock); |
4323add6 | 572 | write_unlock_bh(&tipc_net_lock); |
16cb4b33 | 573 | info("Enabled bearer <%s>, discovery domain %s, priority %u\n", |
c68ca7b7 | 574 | name, tipc_addr_string_fill(addr_string, bcast_scope), priority); |
b97bf3fd PL |
575 | return 0; |
576 | failed: | |
4323add6 | 577 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
578 | return res; |
579 | } | |
580 | ||
581 | /** | |
582 | * tipc_block_bearer(): Block the bearer with the given name, | |
583 | * and reset all its links | |
584 | */ | |
585 | ||
586 | int tipc_block_bearer(const char *name) | |
587 | { | |
2d627b92 | 588 | struct tipc_bearer *b_ptr = NULL; |
b97bf3fd PL |
589 | struct link *l_ptr; |
590 | struct link *temp_l_ptr; | |
591 | ||
4323add6 | 592 | read_lock_bh(&tipc_net_lock); |
b97bf3fd PL |
593 | b_ptr = bearer_find(name); |
594 | if (!b_ptr) { | |
595 | warn("Attempt to block unknown bearer <%s>\n", name); | |
4323add6 | 596 | read_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
597 | return -EINVAL; |
598 | } | |
599 | ||
a10bd924 | 600 | info("Blocking bearer <%s>\n", name); |
2d627b92 AS |
601 | spin_lock_bh(&b_ptr->lock); |
602 | b_ptr->blocked = 1; | |
b97bf3fd | 603 | list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { |
6c00055a | 604 | struct tipc_node *n_ptr = l_ptr->owner; |
b97bf3fd PL |
605 | |
606 | spin_lock_bh(&n_ptr->lock); | |
4323add6 | 607 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
608 | spin_unlock_bh(&n_ptr->lock); |
609 | } | |
2d627b92 | 610 | spin_unlock_bh(&b_ptr->lock); |
4323add6 | 611 | read_unlock_bh(&tipc_net_lock); |
0e35fd5e | 612 | return 0; |
b97bf3fd PL |
613 | } |
614 | ||
615 | /** | |
616 | * bearer_disable - | |
c4307285 | 617 | * |
4323add6 | 618 | * Note: This routine assumes caller holds tipc_net_lock. |
b97bf3fd PL |
619 | */ |
620 | ||
2d627b92 | 621 | static void bearer_disable(struct tipc_bearer *b_ptr) |
b97bf3fd | 622 | { |
b97bf3fd PL |
623 | struct link *l_ptr; |
624 | struct link *temp_l_ptr; | |
625 | ||
2d627b92 | 626 | info("Disabling bearer <%s>\n", b_ptr->name); |
4323add6 | 627 | tipc_disc_stop_link_req(b_ptr->link_req); |
2d627b92 | 628 | spin_lock_bh(&b_ptr->lock); |
b97bf3fd | 629 | b_ptr->link_req = NULL; |
2d627b92 AS |
630 | b_ptr->blocked = 1; |
631 | b_ptr->media->disable_bearer(b_ptr); | |
b97bf3fd | 632 | list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { |
4323add6 | 633 | tipc_link_delete(l_ptr); |
b97bf3fd | 634 | } |
2d627b92 AS |
635 | spin_unlock_bh(&b_ptr->lock); |
636 | memset(b_ptr, 0, sizeof(struct tipc_bearer)); | |
b97bf3fd PL |
637 | } |
638 | ||
639 | int tipc_disable_bearer(const char *name) | |
640 | { | |
2d627b92 | 641 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
642 | int res; |
643 | ||
4323add6 | 644 | write_lock_bh(&tipc_net_lock); |
ccc901ee AS |
645 | b_ptr = bearer_find(name); |
646 | if (b_ptr == NULL) { | |
647 | warn("Attempt to disable unknown bearer <%s>\n", name); | |
648 | res = -EINVAL; | |
28cc937e AS |
649 | } else { |
650 | bearer_disable(b_ptr); | |
651 | res = 0; | |
652 | } | |
4323add6 | 653 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
654 | return res; |
655 | } | |
656 | ||
657 | ||
658 | ||
4323add6 | 659 | void tipc_bearer_stop(void) |
b97bf3fd PL |
660 | { |
661 | u32 i; | |
662 | ||
b97bf3fd | 663 | for (i = 0; i < MAX_BEARERS; i++) { |
4323add6 | 664 | if (tipc_bearers[i].active) |
ccc901ee | 665 | bearer_disable(&tipc_bearers[i]); |
b97bf3fd | 666 | } |
b97bf3fd PL |
667 | media_count = 0; |
668 | } |