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 | ||
a31abe8d | 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 | 48 | |
3a777ff8 AS |
49 | static void bearer_disable(struct tipc_bearer *b_ptr); |
50 | ||
b97bf3fd PL |
51 | /** |
52 | * media_name_valid - validate media name | |
c4307285 | 53 | * |
b97bf3fd PL |
54 | * Returns 1 if media name is valid, otherwise 0. |
55 | */ | |
56 | ||
57 | static int media_name_valid(const char *name) | |
58 | { | |
59 | u32 len; | |
60 | ||
61 | len = strlen(name); | |
62 | if ((len + 1) > TIPC_MAX_MEDIA_NAME) | |
63 | return 0; | |
a02cec21 | 64 | return strspn(name, tipc_alphabet) == len; |
b97bf3fd PL |
65 | } |
66 | ||
67 | /** | |
68 | * media_find - locates specified media object by name | |
69 | */ | |
70 | ||
71 | static struct media *media_find(const char *name) | |
72 | { | |
b97bf3fd PL |
73 | u32 i; |
74 | ||
a31abe8d AS |
75 | for (i = 0; i < media_count; i++) { |
76 | if (!strcmp(media_list[i]->name, name)) | |
77 | return media_list[i]; | |
b97bf3fd | 78 | } |
1fc54d8f | 79 | return NULL; |
b97bf3fd PL |
80 | } |
81 | ||
c79be454 AS |
82 | /** |
83 | * media_find_id - locates specified media object by type identifier | |
84 | */ | |
85 | ||
86 | static struct media *media_find_id(u8 type) | |
87 | { | |
88 | u32 i; | |
89 | ||
90 | for (i = 0; i < media_count; i++) { | |
a31abe8d AS |
91 | if (media_list[i]->type_id == type) |
92 | return media_list[i]; | |
c79be454 AS |
93 | } |
94 | return NULL; | |
95 | } | |
96 | ||
b97bf3fd PL |
97 | /** |
98 | * tipc_register_media - register a media type | |
c4307285 | 99 | * |
b97bf3fd PL |
100 | * Bearers for this media type must be activated separately at a later stage. |
101 | */ | |
102 | ||
706767da | 103 | int tipc_register_media(struct media *m_ptr) |
b97bf3fd | 104 | { |
b97bf3fd PL |
105 | int res = -EINVAL; |
106 | ||
4323add6 | 107 | write_lock_bh(&tipc_net_lock); |
b97bf3fd | 108 | |
d0021b25 | 109 | if (tipc_mode != TIPC_NET_MODE) { |
706767da AS |
110 | warn("Media <%s> rejected, not in networked mode yet\n", |
111 | m_ptr->name); | |
d0021b25 NH |
112 | goto exit; |
113 | } | |
706767da AS |
114 | if (!media_name_valid(m_ptr->name)) { |
115 | warn("Media <%s> rejected, illegal name\n", m_ptr->name); | |
b97bf3fd PL |
116 | goto exit; |
117 | } | |
706767da AS |
118 | if (m_ptr->bcast_addr.type != htonl(m_ptr->type_id)) { |
119 | warn("Media <%s> rejected, illegal broadcast address\n", | |
120 | m_ptr->name); | |
b97bf3fd PL |
121 | goto exit; |
122 | } | |
706767da AS |
123 | if ((m_ptr->priority < TIPC_MIN_LINK_PRI) || |
124 | (m_ptr->priority > TIPC_MAX_LINK_PRI)) { | |
125 | warn("Media <%s> rejected, illegal priority (%u)\n", | |
126 | m_ptr->name, m_ptr->priority); | |
b97bf3fd PL |
127 | goto exit; |
128 | } | |
706767da AS |
129 | if ((m_ptr->tolerance < TIPC_MIN_LINK_TOL) || |
130 | (m_ptr->tolerance > TIPC_MAX_LINK_TOL)) { | |
131 | warn("Media <%s> rejected, illegal tolerance (%u)\n", | |
132 | m_ptr->name, m_ptr->tolerance); | |
b97bf3fd PL |
133 | goto exit; |
134 | } | |
135 | ||
c79be454 | 136 | if (media_count >= MAX_MEDIA) { |
706767da AS |
137 | warn("Media <%s> rejected, media limit reached (%u)\n", |
138 | m_ptr->name, MAX_MEDIA); | |
b97bf3fd PL |
139 | goto exit; |
140 | } | |
c79be454 AS |
141 | if (media_find(m_ptr->name) || media_find_id(m_ptr->type_id)) { |
142 | warn("Media <%s> rejected, already registered\n", m_ptr->name); | |
143 | goto exit; | |
b97bf3fd PL |
144 | } |
145 | ||
a31abe8d | 146 | media_list[media_count] = m_ptr; |
c79be454 | 147 | media_count++; |
b97bf3fd PL |
148 | res = 0; |
149 | exit: | |
4323add6 | 150 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
151 | return res; |
152 | } | |
153 | ||
154 | /** | |
4323add6 | 155 | * tipc_media_addr_printf - record media address in print buffer |
b97bf3fd PL |
156 | */ |
157 | ||
4323add6 | 158 | void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a) |
b97bf3fd PL |
159 | { |
160 | struct media *m_ptr; | |
161 | u32 media_type; | |
162 | u32 i; | |
163 | ||
164 | media_type = ntohl(a->type); | |
a31abe8d | 165 | m_ptr = media_find_id(media_type); |
b97bf3fd | 166 | |
a31abe8d | 167 | if (m_ptr && (m_ptr->addr2str != NULL)) { |
b97bf3fd PL |
168 | char addr_str[MAX_ADDR_STR]; |
169 | ||
e91ed0bc | 170 | tipc_printf(pb, "%s(%s)", m_ptr->name, |
b97bf3fd PL |
171 | m_ptr->addr2str(a, addr_str, sizeof(addr_str))); |
172 | } else { | |
173 | unchar *addr = (unchar *)&a->dev_addr; | |
174 | ||
e91ed0bc | 175 | tipc_printf(pb, "UNKNOWN(%u)", media_type); |
a016892c | 176 | for (i = 0; i < (sizeof(*a) - sizeof(a->type)); i++) |
e91ed0bc | 177 | tipc_printf(pb, "-%02x", addr[i]); |
b97bf3fd PL |
178 | } |
179 | } | |
180 | ||
181 | /** | |
4323add6 | 182 | * tipc_media_get_names - record names of registered media in buffer |
b97bf3fd PL |
183 | */ |
184 | ||
4323add6 | 185 | struct sk_buff *tipc_media_get_names(void) |
b97bf3fd PL |
186 | { |
187 | struct sk_buff *buf; | |
b97bf3fd PL |
188 | int i; |
189 | ||
4323add6 | 190 | buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME)); |
b97bf3fd PL |
191 | if (!buf) |
192 | return NULL; | |
193 | ||
4323add6 | 194 | read_lock_bh(&tipc_net_lock); |
a31abe8d AS |
195 | for (i = 0; i < media_count; i++) { |
196 | tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, | |
197 | media_list[i]->name, | |
198 | strlen(media_list[i]->name) + 1); | |
b97bf3fd | 199 | } |
4323add6 | 200 | read_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
201 | return buf; |
202 | } | |
203 | ||
204 | /** | |
205 | * bearer_name_validate - validate & (optionally) deconstruct bearer name | |
206 | * @name - ptr to bearer name string | |
207 | * @name_parts - ptr to area for bearer name components (or NULL if not needed) | |
c4307285 | 208 | * |
b97bf3fd PL |
209 | * Returns 1 if bearer name is valid, otherwise 0. |
210 | */ | |
211 | ||
c4307285 | 212 | static int bearer_name_validate(const char *name, |
b97bf3fd PL |
213 | struct bearer_name *name_parts) |
214 | { | |
215 | char name_copy[TIPC_MAX_BEARER_NAME]; | |
216 | char *media_name; | |
217 | char *if_name; | |
218 | u32 media_len; | |
219 | u32 if_len; | |
220 | ||
221 | /* copy bearer name & ensure length is OK */ | |
222 | ||
223 | name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; | |
224 | /* need above in case non-Posix strncpy() doesn't pad with nulls */ | |
225 | strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); | |
226 | if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) | |
227 | return 0; | |
228 | ||
229 | /* ensure all component parts of bearer name are present */ | |
230 | ||
231 | media_name = name_copy; | |
2db9983a AS |
232 | if_name = strchr(media_name, ':'); |
233 | if (if_name == NULL) | |
b97bf3fd PL |
234 | return 0; |
235 | *(if_name++) = 0; | |
236 | media_len = if_name - media_name; | |
237 | if_len = strlen(if_name) + 1; | |
238 | ||
239 | /* validate component parts of bearer name */ | |
240 | ||
c4307285 YH |
241 | if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || |
242 | (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) || | |
b97bf3fd PL |
243 | (strspn(media_name, tipc_alphabet) != (media_len - 1)) || |
244 | (strspn(if_name, tipc_alphabet) != (if_len - 1))) | |
245 | return 0; | |
246 | ||
247 | /* return bearer name components, if necessary */ | |
248 | ||
249 | if (name_parts) { | |
250 | strcpy(name_parts->media_name, media_name); | |
251 | strcpy(name_parts->if_name, if_name); | |
252 | } | |
253 | return 1; | |
254 | } | |
255 | ||
256 | /** | |
257 | * bearer_find - locates bearer object with matching bearer name | |
258 | */ | |
259 | ||
2d627b92 | 260 | static struct tipc_bearer *bearer_find(const char *name) |
b97bf3fd | 261 | { |
2d627b92 | 262 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
263 | u32 i; |
264 | ||
4323add6 | 265 | for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) { |
2d627b92 | 266 | if (b_ptr->active && (!strcmp(b_ptr->name, name))) |
b97bf3fd PL |
267 | return b_ptr; |
268 | } | |
1fc54d8f | 269 | return NULL; |
b97bf3fd PL |
270 | } |
271 | ||
272 | /** | |
4323add6 | 273 | * tipc_bearer_find_interface - locates bearer object with matching interface name |
b97bf3fd PL |
274 | */ |
275 | ||
2d627b92 | 276 | struct tipc_bearer *tipc_bearer_find_interface(const char *if_name) |
b97bf3fd | 277 | { |
2d627b92 | 278 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
279 | char *b_if_name; |
280 | u32 i; | |
281 | ||
4323add6 | 282 | for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) { |
b97bf3fd PL |
283 | if (!b_ptr->active) |
284 | continue; | |
2d627b92 | 285 | b_if_name = strchr(b_ptr->name, ':') + 1; |
b97bf3fd PL |
286 | if (!strcmp(b_if_name, if_name)) |
287 | return b_ptr; | |
288 | } | |
1fc54d8f | 289 | return NULL; |
b97bf3fd PL |
290 | } |
291 | ||
292 | /** | |
4323add6 | 293 | * tipc_bearer_get_names - record names of bearers in buffer |
b97bf3fd PL |
294 | */ |
295 | ||
4323add6 | 296 | struct sk_buff *tipc_bearer_get_names(void) |
b97bf3fd PL |
297 | { |
298 | struct sk_buff *buf; | |
2d627b92 | 299 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
300 | int i, j; |
301 | ||
4323add6 | 302 | buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME)); |
b97bf3fd PL |
303 | if (!buf) |
304 | return NULL; | |
305 | ||
4323add6 | 306 | read_lock_bh(&tipc_net_lock); |
a31abe8d | 307 | for (i = 0; i < media_count; i++) { |
b97bf3fd | 308 | for (j = 0; j < MAX_BEARERS; j++) { |
4323add6 | 309 | b_ptr = &tipc_bearers[j]; |
a31abe8d | 310 | if (b_ptr->active && (b_ptr->media == media_list[i])) { |
c4307285 | 311 | tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME, |
2d627b92 AS |
312 | b_ptr->name, |
313 | strlen(b_ptr->name) + 1); | |
b97bf3fd PL |
314 | } |
315 | } | |
316 | } | |
4323add6 | 317 | read_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
318 | return buf; |
319 | } | |
320 | ||
2d627b92 | 321 | void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest) |
b97bf3fd | 322 | { |
4323add6 | 323 | tipc_nmap_add(&b_ptr->nodes, dest); |
4323add6 | 324 | tipc_bcbearer_sort(); |
1209966c | 325 | tipc_disc_add_dest(b_ptr->link_req); |
b97bf3fd PL |
326 | } |
327 | ||
2d627b92 | 328 | void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest) |
b97bf3fd | 329 | { |
4323add6 | 330 | tipc_nmap_remove(&b_ptr->nodes, dest); |
4323add6 | 331 | tipc_bcbearer_sort(); |
1209966c | 332 | tipc_disc_remove_dest(b_ptr->link_req); |
b97bf3fd PL |
333 | } |
334 | ||
335 | /* | |
336 | * bearer_push(): Resolve bearer congestion. Force the waiting | |
337 | * links to push out their unsent packets, one packet per link | |
338 | * per iteration, until all packets are gone or congestion reoccurs. | |
4323add6 | 339 | * 'tipc_net_lock' is read_locked when this function is called |
b97bf3fd PL |
340 | * bearer.lock must be taken before calling |
341 | * Returns binary true(1) ore false(0) | |
342 | */ | |
2d627b92 | 343 | static int bearer_push(struct tipc_bearer *b_ptr) |
b97bf3fd | 344 | { |
0e35fd5e | 345 | u32 res = 0; |
b97bf3fd PL |
346 | struct link *ln, *tln; |
347 | ||
2d627b92 | 348 | if (b_ptr->blocked) |
b97bf3fd PL |
349 | return 0; |
350 | ||
351 | while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) { | |
352 | list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) { | |
4323add6 | 353 | res = tipc_link_push_packet(ln); |
b97bf3fd PL |
354 | if (res == PUSH_FAILED) |
355 | break; | |
356 | if (res == PUSH_FINISHED) | |
357 | list_move_tail(&ln->link_list, &b_ptr->links); | |
358 | } | |
359 | } | |
360 | return list_empty(&b_ptr->cong_links); | |
361 | } | |
362 | ||
2d627b92 | 363 | void tipc_bearer_lock_push(struct tipc_bearer *b_ptr) |
b97bf3fd | 364 | { |
2d627b92 | 365 | spin_lock_bh(&b_ptr->lock); |
23f0ff90 | 366 | bearer_push(b_ptr); |
2d627b92 | 367 | spin_unlock_bh(&b_ptr->lock); |
b97bf3fd PL |
368 | } |
369 | ||
370 | ||
371 | /* | |
c4307285 YH |
372 | * Interrupt enabling new requests after bearer congestion or blocking: |
373 | * See bearer_send(). | |
b97bf3fd | 374 | */ |
2d627b92 | 375 | void tipc_continue(struct tipc_bearer *b_ptr) |
b97bf3fd | 376 | { |
2d627b92 | 377 | spin_lock_bh(&b_ptr->lock); |
b97bf3fd | 378 | if (!list_empty(&b_ptr->cong_links)) |
4323add6 | 379 | tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr); |
2d627b92 AS |
380 | b_ptr->blocked = 0; |
381 | spin_unlock_bh(&b_ptr->lock); | |
b97bf3fd PL |
382 | } |
383 | ||
384 | /* | |
c4307285 YH |
385 | * Schedule link for sending of messages after the bearer |
386 | * has been deblocked by 'continue()'. This method is called | |
387 | * when somebody tries to send a message via this link while | |
4323add6 | 388 | * the bearer is congested. 'tipc_net_lock' is in read_lock here |
b97bf3fd PL |
389 | * bearer.lock is busy |
390 | */ | |
391 | ||
2d627b92 | 392 | static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b97bf3fd PL |
393 | { |
394 | list_move_tail(&l_ptr->link_list, &b_ptr->cong_links); | |
395 | } | |
396 | ||
397 | /* | |
c4307285 YH |
398 | * Schedule link for sending of messages after the bearer |
399 | * has been deblocked by 'continue()'. This method is called | |
400 | * when somebody tries to send a message via this link while | |
4323add6 | 401 | * the bearer is congested. 'tipc_net_lock' is in read_lock here, |
b97bf3fd PL |
402 | * bearer.lock is free |
403 | */ | |
404 | ||
2d627b92 | 405 | void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b97bf3fd | 406 | { |
2d627b92 | 407 | spin_lock_bh(&b_ptr->lock); |
4323add6 | 408 | tipc_bearer_schedule_unlocked(b_ptr, l_ptr); |
2d627b92 | 409 | spin_unlock_bh(&b_ptr->lock); |
b97bf3fd PL |
410 | } |
411 | ||
412 | ||
413 | /* | |
4323add6 | 414 | * tipc_bearer_resolve_congestion(): Check if there is bearer congestion, |
b97bf3fd | 415 | * and if there is, try to resolve it before returning. |
4323add6 | 416 | * 'tipc_net_lock' is read_locked when this function is called |
b97bf3fd | 417 | */ |
2d627b92 | 418 | int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b97bf3fd PL |
419 | { |
420 | int res = 1; | |
421 | ||
422 | if (list_empty(&b_ptr->cong_links)) | |
423 | return 1; | |
2d627b92 | 424 | spin_lock_bh(&b_ptr->lock); |
b97bf3fd | 425 | if (!bearer_push(b_ptr)) { |
4323add6 | 426 | tipc_bearer_schedule_unlocked(b_ptr, l_ptr); |
b97bf3fd PL |
427 | res = 0; |
428 | } | |
2d627b92 | 429 | spin_unlock_bh(&b_ptr->lock); |
b97bf3fd PL |
430 | return res; |
431 | } | |
432 | ||
b274f4ab AS |
433 | /** |
434 | * tipc_bearer_congested - determines if bearer is currently congested | |
435 | */ | |
436 | ||
2d627b92 | 437 | int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct link *l_ptr) |
b274f4ab | 438 | { |
2d627b92 | 439 | if (unlikely(b_ptr->blocked)) |
b274f4ab AS |
440 | return 1; |
441 | if (likely(list_empty(&b_ptr->cong_links))) | |
442 | return 0; | |
443 | return !tipc_bearer_resolve_congestion(b_ptr, l_ptr); | |
444 | } | |
b97bf3fd PL |
445 | |
446 | /** | |
447 | * tipc_enable_bearer - enable bearer with the given name | |
c4307285 | 448 | */ |
b97bf3fd | 449 | |
50d3e639 | 450 | int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority) |
b97bf3fd | 451 | { |
2d627b92 | 452 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
453 | struct media *m_ptr; |
454 | struct bearer_name b_name; | |
455 | char addr_string[16]; | |
456 | u32 bearer_id; | |
457 | u32 with_this_prio; | |
458 | u32 i; | |
459 | int res = -EINVAL; | |
460 | ||
a10bd924 AS |
461 | if (tipc_mode != TIPC_NET_MODE) { |
462 | warn("Bearer <%s> rejected, not supported in standalone mode\n", | |
463 | name); | |
b97bf3fd | 464 | return -ENOPROTOOPT; |
a10bd924 AS |
465 | } |
466 | if (!bearer_name_validate(name, &b_name)) { | |
467 | warn("Bearer <%s> rejected, illegal name\n", name); | |
16cb4b33 | 468 | return -EINVAL; |
a10bd924 | 469 | } |
66e019a6 AS |
470 | if (tipc_addr_domain_valid(disc_domain) && |
471 | (disc_domain != tipc_own_addr)) { | |
472 | if (tipc_in_scope(disc_domain, tipc_own_addr)) { | |
473 | disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK; | |
474 | res = 0; /* accept any node in own cluster */ | |
475 | } else if (in_own_cluster(disc_domain)) | |
476 | res = 0; /* accept specified node in own cluster */ | |
477 | } | |
478 | if (res) { | |
50d3e639 | 479 | warn("Bearer <%s> rejected, illegal discovery domain\n", name); |
a10bd924 AS |
480 | return -EINVAL; |
481 | } | |
16cb4b33 PL |
482 | if ((priority < TIPC_MIN_LINK_PRI || |
483 | priority > TIPC_MAX_LINK_PRI) && | |
a10bd924 AS |
484 | (priority != TIPC_MEDIA_LINK_PRI)) { |
485 | warn("Bearer <%s> rejected, illegal priority\n", name); | |
b97bf3fd | 486 | return -EINVAL; |
a10bd924 | 487 | } |
b97bf3fd | 488 | |
4323add6 | 489 | write_lock_bh(&tipc_net_lock); |
b97bf3fd PL |
490 | |
491 | m_ptr = media_find(b_name.media_name); | |
492 | if (!m_ptr) { | |
a10bd924 AS |
493 | warn("Bearer <%s> rejected, media <%s> not registered\n", name, |
494 | b_name.media_name); | |
3a777ff8 | 495 | goto exit; |
b97bf3fd | 496 | } |
16cb4b33 PL |
497 | |
498 | if (priority == TIPC_MEDIA_LINK_PRI) | |
b97bf3fd PL |
499 | priority = m_ptr->priority; |
500 | ||
501 | restart: | |
502 | bearer_id = MAX_BEARERS; | |
503 | with_this_prio = 1; | |
504 | for (i = MAX_BEARERS; i-- != 0; ) { | |
4323add6 | 505 | if (!tipc_bearers[i].active) { |
b97bf3fd PL |
506 | bearer_id = i; |
507 | continue; | |
508 | } | |
2d627b92 | 509 | if (!strcmp(name, tipc_bearers[i].name)) { |
a10bd924 | 510 | warn("Bearer <%s> rejected, already enabled\n", name); |
3a777ff8 | 511 | goto exit; |
b97bf3fd | 512 | } |
4323add6 | 513 | if ((tipc_bearers[i].priority == priority) && |
b97bf3fd PL |
514 | (++with_this_prio > 2)) { |
515 | if (priority-- == 0) { | |
a10bd924 AS |
516 | warn("Bearer <%s> rejected, duplicate priority\n", |
517 | name); | |
3a777ff8 | 518 | goto exit; |
b97bf3fd | 519 | } |
a10bd924 | 520 | warn("Bearer <%s> priority adjustment required %u->%u\n", |
b97bf3fd PL |
521 | name, priority + 1, priority); |
522 | goto restart; | |
523 | } | |
524 | } | |
525 | if (bearer_id >= MAX_BEARERS) { | |
c4307285 | 526 | warn("Bearer <%s> rejected, bearer limit reached (%u)\n", |
a10bd924 | 527 | name, MAX_BEARERS); |
3a777ff8 | 528 | goto exit; |
b97bf3fd PL |
529 | } |
530 | ||
4323add6 | 531 | b_ptr = &tipc_bearers[bearer_id]; |
2d627b92 AS |
532 | strcpy(b_ptr->name, name); |
533 | res = m_ptr->enable_bearer(b_ptr); | |
b97bf3fd | 534 | if (res) { |
a10bd924 | 535 | warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res); |
3a777ff8 | 536 | goto exit; |
b97bf3fd PL |
537 | } |
538 | ||
539 | b_ptr->identity = bearer_id; | |
540 | b_ptr->media = m_ptr; | |
541 | b_ptr->net_plane = bearer_id + 'A'; | |
542 | b_ptr->active = 1; | |
b97bf3fd PL |
543 | b_ptr->priority = priority; |
544 | INIT_LIST_HEAD(&b_ptr->cong_links); | |
545 | INIT_LIST_HEAD(&b_ptr->links); | |
2d627b92 | 546 | spin_lock_init(&b_ptr->lock); |
3a777ff8 AS |
547 | |
548 | res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain); | |
549 | if (res) { | |
550 | bearer_disable(b_ptr); | |
551 | warn("Bearer <%s> rejected, discovery object creation failed\n", | |
552 | name); | |
553 | goto exit; | |
554 | } | |
16cb4b33 | 555 | info("Enabled bearer <%s>, discovery domain %s, priority %u\n", |
50d3e639 | 556 | name, tipc_addr_string_fill(addr_string, disc_domain), priority); |
3a777ff8 | 557 | exit: |
4323add6 | 558 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
559 | return res; |
560 | } | |
561 | ||
562 | /** | |
563 | * tipc_block_bearer(): Block the bearer with the given name, | |
564 | * and reset all its links | |
565 | */ | |
566 | ||
567 | int tipc_block_bearer(const char *name) | |
568 | { | |
2d627b92 | 569 | struct tipc_bearer *b_ptr = NULL; |
b97bf3fd PL |
570 | struct link *l_ptr; |
571 | struct link *temp_l_ptr; | |
572 | ||
4323add6 | 573 | read_lock_bh(&tipc_net_lock); |
b97bf3fd PL |
574 | b_ptr = bearer_find(name); |
575 | if (!b_ptr) { | |
576 | warn("Attempt to block unknown bearer <%s>\n", name); | |
4323add6 | 577 | read_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
578 | return -EINVAL; |
579 | } | |
580 | ||
a10bd924 | 581 | info("Blocking bearer <%s>\n", name); |
2d627b92 AS |
582 | spin_lock_bh(&b_ptr->lock); |
583 | b_ptr->blocked = 1; | |
4b3743ef | 584 | list_splice_init(&b_ptr->cong_links, &b_ptr->links); |
b97bf3fd | 585 | list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { |
6c00055a | 586 | struct tipc_node *n_ptr = l_ptr->owner; |
b97bf3fd PL |
587 | |
588 | spin_lock_bh(&n_ptr->lock); | |
4323add6 | 589 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
590 | spin_unlock_bh(&n_ptr->lock); |
591 | } | |
2d627b92 | 592 | spin_unlock_bh(&b_ptr->lock); |
4323add6 | 593 | read_unlock_bh(&tipc_net_lock); |
0e35fd5e | 594 | return 0; |
b97bf3fd PL |
595 | } |
596 | ||
597 | /** | |
598 | * bearer_disable - | |
c4307285 | 599 | * |
4323add6 | 600 | * Note: This routine assumes caller holds tipc_net_lock. |
b97bf3fd PL |
601 | */ |
602 | ||
2d627b92 | 603 | static void bearer_disable(struct tipc_bearer *b_ptr) |
b97bf3fd | 604 | { |
b97bf3fd PL |
605 | struct link *l_ptr; |
606 | struct link *temp_l_ptr; | |
607 | ||
2d627b92 | 608 | info("Disabling bearer <%s>\n", b_ptr->name); |
2d627b92 | 609 | spin_lock_bh(&b_ptr->lock); |
2d627b92 AS |
610 | b_ptr->blocked = 1; |
611 | b_ptr->media->disable_bearer(b_ptr); | |
4b3743ef | 612 | list_splice_init(&b_ptr->cong_links, &b_ptr->links); |
b97bf3fd | 613 | list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { |
4323add6 | 614 | tipc_link_delete(l_ptr); |
b97bf3fd | 615 | } |
3a777ff8 AS |
616 | if (b_ptr->link_req) |
617 | tipc_disc_delete(b_ptr->link_req); | |
2d627b92 AS |
618 | spin_unlock_bh(&b_ptr->lock); |
619 | memset(b_ptr, 0, sizeof(struct tipc_bearer)); | |
b97bf3fd PL |
620 | } |
621 | ||
622 | int tipc_disable_bearer(const char *name) | |
623 | { | |
2d627b92 | 624 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
625 | int res; |
626 | ||
4323add6 | 627 | write_lock_bh(&tipc_net_lock); |
ccc901ee AS |
628 | b_ptr = bearer_find(name); |
629 | if (b_ptr == NULL) { | |
630 | warn("Attempt to disable unknown bearer <%s>\n", name); | |
631 | res = -EINVAL; | |
28cc937e AS |
632 | } else { |
633 | bearer_disable(b_ptr); | |
634 | res = 0; | |
635 | } | |
4323add6 | 636 | write_unlock_bh(&tipc_net_lock); |
b97bf3fd PL |
637 | return res; |
638 | } | |
639 | ||
640 | ||
641 | ||
4323add6 | 642 | void tipc_bearer_stop(void) |
b97bf3fd PL |
643 | { |
644 | u32 i; | |
645 | ||
b97bf3fd | 646 | for (i = 0; i < MAX_BEARERS; i++) { |
4323add6 | 647 | if (tipc_bearers[i].active) |
ccc901ee | 648 | bearer_disable(&tipc_bearers[i]); |
b97bf3fd | 649 | } |
b97bf3fd PL |
650 | media_count = 0; |
651 | } |