blob: 75a5968c2139b92640f58cb961fafe01660b1d3f [file] [log] [blame]
Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 1996-2006, Ericsson AB
Per Lidenb97bf3f2006-01-02 19:04:38 +01005 * Copyright (c) 2004-2005, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
38#include "config.h"
39#include "dbg.h"
40#include "bearer.h"
41#include "link.h"
42#include "port.h"
43#include "discover.h"
44#include "bcast.h"
45
46#define MAX_ADDR_STR 32
47
Sam Ravnborg1fc54d82006-03-20 22:36:47 -080048static struct media *media_list = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +010049static u32 media_count = 0;
50
Sam Ravnborg1fc54d82006-03-20 22:36:47 -080051struct bearer *tipc_bearers = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +010052
53/**
54 * media_name_valid - validate media name
55 *
56 * Returns 1 if media name is valid, otherwise 0.
57 */
58
59static int media_name_valid(const char *name)
60{
61 u32 len;
62
63 len = strlen(name);
64 if ((len + 1) > TIPC_MAX_MEDIA_NAME)
65 return 0;
66 return (strspn(name, tipc_alphabet) == len);
67}
68
69/**
70 * media_find - locates specified media object by name
71 */
72
73static struct media *media_find(const char *name)
74{
75 struct media *m_ptr;
76 u32 i;
77
78 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
79 if (!strcmp(m_ptr->name, name))
80 return m_ptr;
81 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -080082 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +010083}
84
85/**
86 * tipc_register_media - register a media type
87 *
88 * Bearers for this media type must be activated separately at a later stage.
89 */
90
91int tipc_register_media(u32 media_type,
92 char *name,
93 int (*enable)(struct tipc_bearer *),
94 void (*disable)(struct tipc_bearer *),
95 int (*send_msg)(struct sk_buff *,
96 struct tipc_bearer *,
97 struct tipc_media_addr *),
98 char *(*addr2str)(struct tipc_media_addr *a,
99 char *str_buf, int str_size),
100 struct tipc_media_addr *bcast_addr,
101 const u32 bearer_priority,
102 const u32 link_tolerance, /* [ms] */
103 const u32 send_window_limit)
104{
105 struct media *m_ptr;
106 u32 media_id;
107 u32 i;
108 int res = -EINVAL;
109
Per Liden4323add2006-01-18 00:38:21 +0100110 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100111 if (!media_list)
112 goto exit;
113
114 if (!media_name_valid(name)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700115 warn("Media <%s> rejected, illegal name\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100116 goto exit;
117 }
118 if (!bcast_addr) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700119 warn("Media <%s> rejected, no broadcast address\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100120 goto exit;
121 }
Per Liden16cb4b32006-01-13 22:22:22 +0100122 if ((bearer_priority < TIPC_MIN_LINK_PRI) &&
123 (bearer_priority > TIPC_MAX_LINK_PRI)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700124 warn("Media <%s> rejected, illegal priority (%u)\n", name,
125 bearer_priority);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100126 goto exit;
127 }
128 if ((link_tolerance < TIPC_MIN_LINK_TOL) ||
129 (link_tolerance > TIPC_MAX_LINK_TOL)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700130 warn("Media <%s> rejected, illegal tolerance (%u)\n", name,
131 link_tolerance);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100132 goto exit;
133 }
134
135 media_id = media_count++;
136 if (media_id >= MAX_MEDIA) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700137 warn("Media <%s> rejected, media limit reached (%u)\n", name,
138 MAX_MEDIA);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100139 media_count--;
140 goto exit;
141 }
142 for (i = 0; i < media_id; i++) {
143 if (media_list[i].type_id == media_type) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700144 warn("Media <%s> rejected, duplicate type (%u)\n", name,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100145 media_type);
146 media_count--;
147 goto exit;
148 }
149 if (!strcmp(name, media_list[i].name)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700150 warn("Media <%s> rejected, duplicate name\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100151 media_count--;
152 goto exit;
153 }
154 }
155
156 m_ptr = &media_list[media_id];
157 m_ptr->type_id = media_type;
158 m_ptr->send_msg = send_msg;
159 m_ptr->enable_bearer = enable;
160 m_ptr->disable_bearer = disable;
161 m_ptr->addr2str = addr2str;
162 memcpy(&m_ptr->bcast_addr, bcast_addr, sizeof(*bcast_addr));
163 m_ptr->bcast = 1;
164 strcpy(m_ptr->name, name);
165 m_ptr->priority = bearer_priority;
166 m_ptr->tolerance = link_tolerance;
167 m_ptr->window = send_window_limit;
168 dbg("Media <%s> registered\n", name);
169 res = 0;
170exit:
Per Liden4323add2006-01-18 00:38:21 +0100171 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100172 return res;
173}
174
175/**
Per Liden4323add2006-01-18 00:38:21 +0100176 * tipc_media_addr_printf - record media address in print buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100177 */
178
Per Liden4323add2006-01-18 00:38:21 +0100179void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100180{
181 struct media *m_ptr;
182 u32 media_type;
183 u32 i;
184
185 media_type = ntohl(a->type);
186 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
187 if (m_ptr->type_id == media_type)
188 break;
189 }
190
191 if ((i < media_count) && (m_ptr->addr2str != NULL)) {
192 char addr_str[MAX_ADDR_STR];
193
194 tipc_printf(pb, "%s(%s) ", m_ptr->name,
195 m_ptr->addr2str(a, addr_str, sizeof(addr_str)));
196 } else {
197 unchar *addr = (unchar *)&a->dev_addr;
198
199 tipc_printf(pb, "UNKNOWN(%u):", media_type);
200 for (i = 0; i < (sizeof(*a) - sizeof(a->type)); i++) {
201 tipc_printf(pb, "%02x ", addr[i]);
202 }
203 }
204}
205
206/**
Per Liden4323add2006-01-18 00:38:21 +0100207 * tipc_media_get_names - record names of registered media in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100208 */
209
Per Liden4323add2006-01-18 00:38:21 +0100210struct sk_buff *tipc_media_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100211{
212 struct sk_buff *buf;
213 struct media *m_ptr;
214 int i;
215
Per Liden4323add2006-01-18 00:38:21 +0100216 buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100217 if (!buf)
218 return NULL;
219
Per Liden4323add2006-01-18 00:38:21 +0100220 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100221 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
Per Liden4323add2006-01-18 00:38:21 +0100222 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, m_ptr->name,
223 strlen(m_ptr->name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100224 }
Per Liden4323add2006-01-18 00:38:21 +0100225 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100226 return buf;
227}
228
229/**
230 * bearer_name_validate - validate & (optionally) deconstruct bearer name
231 * @name - ptr to bearer name string
232 * @name_parts - ptr to area for bearer name components (or NULL if not needed)
233 *
234 * Returns 1 if bearer name is valid, otherwise 0.
235 */
236
237static int bearer_name_validate(const char *name,
238 struct bearer_name *name_parts)
239{
240 char name_copy[TIPC_MAX_BEARER_NAME];
241 char *media_name;
242 char *if_name;
243 u32 media_len;
244 u32 if_len;
245
246 /* copy bearer name & ensure length is OK */
247
248 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
249 /* need above in case non-Posix strncpy() doesn't pad with nulls */
250 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
251 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
252 return 0;
253
254 /* ensure all component parts of bearer name are present */
255
256 media_name = name_copy;
257 if ((if_name = strchr(media_name, ':')) == NULL)
258 return 0;
259 *(if_name++) = 0;
260 media_len = if_name - media_name;
261 if_len = strlen(if_name) + 1;
262
263 /* validate component parts of bearer name */
264
265 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
266 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) ||
267 (strspn(media_name, tipc_alphabet) != (media_len - 1)) ||
268 (strspn(if_name, tipc_alphabet) != (if_len - 1)))
269 return 0;
270
271 /* return bearer name components, if necessary */
272
273 if (name_parts) {
274 strcpy(name_parts->media_name, media_name);
275 strcpy(name_parts->if_name, if_name);
276 }
277 return 1;
278}
279
280/**
281 * bearer_find - locates bearer object with matching bearer name
282 */
283
284static struct bearer *bearer_find(const char *name)
285{
286 struct bearer *b_ptr;
287 u32 i;
288
Allan Stephensa10bd922006-06-25 23:52:17 -0700289 if (tipc_mode != TIPC_NET_MODE)
290 return NULL;
291
Per Liden4323add2006-01-18 00:38:21 +0100292 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100293 if (b_ptr->active && (!strcmp(b_ptr->publ.name, name)))
294 return b_ptr;
295 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800296 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100297}
298
299/**
Per Liden4323add2006-01-18 00:38:21 +0100300 * tipc_bearer_find_interface - locates bearer object with matching interface name
Per Lidenb97bf3f2006-01-02 19:04:38 +0100301 */
302
Per Liden4323add2006-01-18 00:38:21 +0100303struct bearer *tipc_bearer_find_interface(const char *if_name)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100304{
305 struct bearer *b_ptr;
306 char *b_if_name;
307 u32 i;
308
Per Liden4323add2006-01-18 00:38:21 +0100309 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100310 if (!b_ptr->active)
311 continue;
312 b_if_name = strchr(b_ptr->publ.name, ':') + 1;
313 if (!strcmp(b_if_name, if_name))
314 return b_ptr;
315 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800316 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100317}
318
319/**
Per Liden4323add2006-01-18 00:38:21 +0100320 * tipc_bearer_get_names - record names of bearers in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100321 */
322
Per Liden4323add2006-01-18 00:38:21 +0100323struct sk_buff *tipc_bearer_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100324{
325 struct sk_buff *buf;
326 struct media *m_ptr;
327 struct bearer *b_ptr;
328 int i, j;
329
Per Liden4323add2006-01-18 00:38:21 +0100330 buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100331 if (!buf)
332 return NULL;
333
Per Liden4323add2006-01-18 00:38:21 +0100334 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100335 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
336 for (j = 0; j < MAX_BEARERS; j++) {
Per Liden4323add2006-01-18 00:38:21 +0100337 b_ptr = &tipc_bearers[j];
Per Lidenb97bf3f2006-01-02 19:04:38 +0100338 if (b_ptr->active && (b_ptr->media == m_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +0100339 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
340 b_ptr->publ.name,
341 strlen(b_ptr->publ.name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100342 }
343 }
344 }
Per Liden4323add2006-01-18 00:38:21 +0100345 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100346 return buf;
347}
348
Per Liden4323add2006-01-18 00:38:21 +0100349void tipc_bearer_add_dest(struct bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100350{
Per Liden4323add2006-01-18 00:38:21 +0100351 tipc_nmap_add(&b_ptr->nodes, dest);
352 tipc_disc_update_link_req(b_ptr->link_req);
353 tipc_bcbearer_sort();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100354}
355
Per Liden4323add2006-01-18 00:38:21 +0100356void tipc_bearer_remove_dest(struct bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100357{
Per Liden4323add2006-01-18 00:38:21 +0100358 tipc_nmap_remove(&b_ptr->nodes, dest);
359 tipc_disc_update_link_req(b_ptr->link_req);
360 tipc_bcbearer_sort();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100361}
362
363/*
364 * bearer_push(): Resolve bearer congestion. Force the waiting
365 * links to push out their unsent packets, one packet per link
366 * per iteration, until all packets are gone or congestion reoccurs.
Per Liden4323add2006-01-18 00:38:21 +0100367 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100368 * bearer.lock must be taken before calling
369 * Returns binary true(1) ore false(0)
370 */
371static int bearer_push(struct bearer *b_ptr)
372{
373 u32 res = TIPC_OK;
374 struct link *ln, *tln;
375
376 if (b_ptr->publ.blocked)
377 return 0;
378
379 while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) {
380 list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100381 res = tipc_link_push_packet(ln);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100382 if (res == PUSH_FAILED)
383 break;
384 if (res == PUSH_FINISHED)
385 list_move_tail(&ln->link_list, &b_ptr->links);
386 }
387 }
388 return list_empty(&b_ptr->cong_links);
389}
390
Per Liden4323add2006-01-18 00:38:21 +0100391void tipc_bearer_lock_push(struct bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100392{
393 int res;
394
395 spin_lock_bh(&b_ptr->publ.lock);
396 res = bearer_push(b_ptr);
397 spin_unlock_bh(&b_ptr->publ.lock);
398 if (res)
Per Liden4323add2006-01-18 00:38:21 +0100399 tipc_bcbearer_push();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100400}
401
402
403/*
404 * Interrupt enabling new requests after bearer congestion or blocking:
405 * See bearer_send().
406 */
407void tipc_continue(struct tipc_bearer *tb_ptr)
408{
409 struct bearer *b_ptr = (struct bearer *)tb_ptr;
410
411 spin_lock_bh(&b_ptr->publ.lock);
412 b_ptr->continue_count++;
413 if (!list_empty(&b_ptr->cong_links))
Per Liden4323add2006-01-18 00:38:21 +0100414 tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100415 b_ptr->publ.blocked = 0;
416 spin_unlock_bh(&b_ptr->publ.lock);
417}
418
419/*
420 * Schedule link for sending of messages after the bearer
421 * has been deblocked by 'continue()'. This method is called
422 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100423 * the bearer is congested. 'tipc_net_lock' is in read_lock here
Per Lidenb97bf3f2006-01-02 19:04:38 +0100424 * bearer.lock is busy
425 */
426
Per Liden4323add2006-01-18 00:38:21 +0100427static void tipc_bearer_schedule_unlocked(struct bearer *b_ptr, struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100428{
429 list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
430}
431
432/*
433 * Schedule link for sending of messages after the bearer
434 * has been deblocked by 'continue()'. This method is called
435 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100436 * the bearer is congested. 'tipc_net_lock' is in read_lock here,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100437 * bearer.lock is free
438 */
439
Per Liden4323add2006-01-18 00:38:21 +0100440void tipc_bearer_schedule(struct bearer *b_ptr, struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100441{
442 spin_lock_bh(&b_ptr->publ.lock);
Per Liden4323add2006-01-18 00:38:21 +0100443 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100444 spin_unlock_bh(&b_ptr->publ.lock);
445}
446
447
448/*
Per Liden4323add2006-01-18 00:38:21 +0100449 * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100450 * and if there is, try to resolve it before returning.
Per Liden4323add2006-01-18 00:38:21 +0100451 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100452 */
Per Liden4323add2006-01-18 00:38:21 +0100453int tipc_bearer_resolve_congestion(struct bearer *b_ptr, struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100454{
455 int res = 1;
456
457 if (list_empty(&b_ptr->cong_links))
458 return 1;
459 spin_lock_bh(&b_ptr->publ.lock);
460 if (!bearer_push(b_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +0100461 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100462 res = 0;
463 }
464 spin_unlock_bh(&b_ptr->publ.lock);
465 return res;
466}
467
468
469/**
470 * tipc_enable_bearer - enable bearer with the given name
471 */
472
473int tipc_enable_bearer(const char *name, u32 bcast_scope, u32 priority)
474{
475 struct bearer *b_ptr;
476 struct media *m_ptr;
477 struct bearer_name b_name;
478 char addr_string[16];
479 u32 bearer_id;
480 u32 with_this_prio;
481 u32 i;
482 int res = -EINVAL;
483
Allan Stephensa10bd922006-06-25 23:52:17 -0700484 if (tipc_mode != TIPC_NET_MODE) {
485 warn("Bearer <%s> rejected, not supported in standalone mode\n",
486 name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100487 return -ENOPROTOOPT;
Allan Stephensa10bd922006-06-25 23:52:17 -0700488 }
489 if (!bearer_name_validate(name, &b_name)) {
490 warn("Bearer <%s> rejected, illegal name\n", name);
Per Liden16cb4b32006-01-13 22:22:22 +0100491 return -EINVAL;
Allan Stephensa10bd922006-06-25 23:52:17 -0700492 }
493 if (!tipc_addr_domain_valid(bcast_scope) ||
494 !in_scope(bcast_scope, tipc_own_addr)) {
495 warn("Bearer <%s> rejected, illegal broadcast scope\n", name);
496 return -EINVAL;
497 }
Per Liden16cb4b32006-01-13 22:22:22 +0100498 if ((priority < TIPC_MIN_LINK_PRI ||
499 priority > TIPC_MAX_LINK_PRI) &&
Allan Stephensa10bd922006-06-25 23:52:17 -0700500 (priority != TIPC_MEDIA_LINK_PRI)) {
501 warn("Bearer <%s> rejected, illegal priority\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100502 return -EINVAL;
Allan Stephensa10bd922006-06-25 23:52:17 -0700503 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100504
Per Liden4323add2006-01-18 00:38:21 +0100505 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100506
507 m_ptr = media_find(b_name.media_name);
508 if (!m_ptr) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700509 warn("Bearer <%s> rejected, media <%s> not registered\n", name,
510 b_name.media_name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100511 goto failed;
512 }
Per Liden16cb4b32006-01-13 22:22:22 +0100513
514 if (priority == TIPC_MEDIA_LINK_PRI)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100515 priority = m_ptr->priority;
516
517restart:
518 bearer_id = MAX_BEARERS;
519 with_this_prio = 1;
520 for (i = MAX_BEARERS; i-- != 0; ) {
Per Liden4323add2006-01-18 00:38:21 +0100521 if (!tipc_bearers[i].active) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100522 bearer_id = i;
523 continue;
524 }
Per Liden4323add2006-01-18 00:38:21 +0100525 if (!strcmp(name, tipc_bearers[i].publ.name)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700526 warn("Bearer <%s> rejected, already enabled\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100527 goto failed;
528 }
Per Liden4323add2006-01-18 00:38:21 +0100529 if ((tipc_bearers[i].priority == priority) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100530 (++with_this_prio > 2)) {
531 if (priority-- == 0) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700532 warn("Bearer <%s> rejected, duplicate priority\n",
533 name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100534 goto failed;
535 }
Allan Stephensa10bd922006-06-25 23:52:17 -0700536 warn("Bearer <%s> priority adjustment required %u->%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +0100537 name, priority + 1, priority);
538 goto restart;
539 }
540 }
541 if (bearer_id >= MAX_BEARERS) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700542 warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
543 name, MAX_BEARERS);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100544 goto failed;
545 }
546
Per Liden4323add2006-01-18 00:38:21 +0100547 b_ptr = &tipc_bearers[bearer_id];
Per Lidenb97bf3f2006-01-02 19:04:38 +0100548 memset(b_ptr, 0, sizeof(struct bearer));
549
550 strcpy(b_ptr->publ.name, name);
551 res = m_ptr->enable_bearer(&b_ptr->publ);
552 if (res) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700553 warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100554 goto failed;
555 }
556
557 b_ptr->identity = bearer_id;
558 b_ptr->media = m_ptr;
559 b_ptr->net_plane = bearer_id + 'A';
560 b_ptr->active = 1;
561 b_ptr->detect_scope = bcast_scope;
562 b_ptr->priority = priority;
563 INIT_LIST_HEAD(&b_ptr->cong_links);
564 INIT_LIST_HEAD(&b_ptr->links);
565 if (m_ptr->bcast) {
Per Liden4323add2006-01-18 00:38:21 +0100566 b_ptr->link_req = tipc_disc_init_link_req(b_ptr, &m_ptr->bcast_addr,
567 bcast_scope, 2);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100568 }
Ingo Molnar34af9462006-06-27 02:53:55 -0700569 spin_lock_init(&b_ptr->publ.lock);
Per Liden4323add2006-01-18 00:38:21 +0100570 write_unlock_bh(&tipc_net_lock);
Per Liden16cb4b32006-01-13 22:22:22 +0100571 info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
572 name, addr_string_fill(addr_string, bcast_scope), priority);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100573 return 0;
574failed:
Per Liden4323add2006-01-18 00:38:21 +0100575 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100576 return res;
577}
578
579/**
580 * tipc_block_bearer(): Block the bearer with the given name,
581 * and reset all its links
582 */
583
584int tipc_block_bearer(const char *name)
585{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800586 struct bearer *b_ptr = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100587 struct link *l_ptr;
588 struct link *temp_l_ptr;
589
Per Liden4323add2006-01-18 00:38:21 +0100590 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100591 b_ptr = bearer_find(name);
592 if (!b_ptr) {
593 warn("Attempt to block unknown bearer <%s>\n", name);
Per Liden4323add2006-01-18 00:38:21 +0100594 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100595 return -EINVAL;
596 }
597
Allan Stephensa10bd922006-06-25 23:52:17 -0700598 info("Blocking bearer <%s>\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100599 spin_lock_bh(&b_ptr->publ.lock);
600 b_ptr->publ.blocked = 1;
601 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
602 struct node *n_ptr = l_ptr->owner;
603
604 spin_lock_bh(&n_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100605 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100606 spin_unlock_bh(&n_ptr->lock);
607 }
608 spin_unlock_bh(&b_ptr->publ.lock);
Per Liden4323add2006-01-18 00:38:21 +0100609 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100610 return TIPC_OK;
611}
612
613/**
614 * bearer_disable -
615 *
Per Liden4323add2006-01-18 00:38:21 +0100616 * Note: This routine assumes caller holds tipc_net_lock.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100617 */
618
619static int bearer_disable(const char *name)
620{
621 struct bearer *b_ptr;
622 struct link *l_ptr;
623 struct link *temp_l_ptr;
624
Per Lidenb97bf3f2006-01-02 19:04:38 +0100625 b_ptr = bearer_find(name);
626 if (!b_ptr) {
627 warn("Attempt to disable unknown bearer <%s>\n", name);
628 return -EINVAL;
629 }
630
Allan Stephensa10bd922006-06-25 23:52:17 -0700631 info("Disabling bearer <%s>\n", name);
Per Liden4323add2006-01-18 00:38:21 +0100632 tipc_disc_stop_link_req(b_ptr->link_req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100633 spin_lock_bh(&b_ptr->publ.lock);
634 b_ptr->link_req = NULL;
635 b_ptr->publ.blocked = 1;
636 if (b_ptr->media->disable_bearer) {
637 spin_unlock_bh(&b_ptr->publ.lock);
Per Liden4323add2006-01-18 00:38:21 +0100638 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100639 b_ptr->media->disable_bearer(&b_ptr->publ);
Per Liden4323add2006-01-18 00:38:21 +0100640 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100641 spin_lock_bh(&b_ptr->publ.lock);
642 }
643 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100644 tipc_link_delete(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100645 }
646 spin_unlock_bh(&b_ptr->publ.lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100647 memset(b_ptr, 0, sizeof(struct bearer));
648 return TIPC_OK;
649}
650
651int tipc_disable_bearer(const char *name)
652{
653 int res;
654
Per Liden4323add2006-01-18 00:38:21 +0100655 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100656 res = bearer_disable(name);
Per Liden4323add2006-01-18 00:38:21 +0100657 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100658 return res;
659}
660
661
662
Per Liden4323add2006-01-18 00:38:21 +0100663int tipc_bearer_init(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100664{
665 int res;
666
Per Liden4323add2006-01-18 00:38:21 +0100667 write_lock_bh(&tipc_net_lock);
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700668 tipc_bearers = kcalloc(MAX_BEARERS, sizeof(struct bearer), GFP_ATOMIC);
669 media_list = kcalloc(MAX_MEDIA, sizeof(struct media), GFP_ATOMIC);
Per Liden4323add2006-01-18 00:38:21 +0100670 if (tipc_bearers && media_list) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100671 res = TIPC_OK;
672 } else {
Per Liden4323add2006-01-18 00:38:21 +0100673 kfree(tipc_bearers);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100674 kfree(media_list);
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800675 tipc_bearers = NULL;
676 media_list = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100677 res = -ENOMEM;
678 }
Per Liden4323add2006-01-18 00:38:21 +0100679 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100680 return res;
681}
682
Per Liden4323add2006-01-18 00:38:21 +0100683void tipc_bearer_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100684{
685 u32 i;
686
Per Liden4323add2006-01-18 00:38:21 +0100687 if (!tipc_bearers)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100688 return;
689
690 for (i = 0; i < MAX_BEARERS; i++) {
Per Liden4323add2006-01-18 00:38:21 +0100691 if (tipc_bearers[i].active)
692 tipc_bearers[i].publ.blocked = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100693 }
694 for (i = 0; i < MAX_BEARERS; i++) {
Per Liden4323add2006-01-18 00:38:21 +0100695 if (tipc_bearers[i].active)
696 bearer_disable(tipc_bearers[i].publ.name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100697 }
Per Liden4323add2006-01-18 00:38:21 +0100698 kfree(tipc_bearers);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100699 kfree(media_list);
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800700 tipc_bearers = NULL;
701 media_list = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100702 media_count = 0;
703}
704
705