blob: e213a8e5485564cf3fadf9089eae4174955667ed [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)) {
115 warn("Media registration error: illegal name <%s>\n", name);
116 goto exit;
117 }
118 if (!bcast_addr) {
119 warn("Media registration error: no broadcast address supplied\n");
120 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)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100124 warn("Media registration error: priority %u\n", bearer_priority);
125 goto exit;
126 }
127 if ((link_tolerance < TIPC_MIN_LINK_TOL) ||
128 (link_tolerance > TIPC_MAX_LINK_TOL)) {
129 warn("Media registration error: tolerance %u\n", link_tolerance);
130 goto exit;
131 }
132
133 media_id = media_count++;
134 if (media_id >= MAX_MEDIA) {
135 warn("Attempt to register more than %u media\n", MAX_MEDIA);
136 media_count--;
137 goto exit;
138 }
139 for (i = 0; i < media_id; i++) {
140 if (media_list[i].type_id == media_type) {
141 warn("Attempt to register second media with type %u\n",
142 media_type);
143 media_count--;
144 goto exit;
145 }
146 if (!strcmp(name, media_list[i].name)) {
147 warn("Attempt to re-register media name <%s>\n", name);
148 media_count--;
149 goto exit;
150 }
151 }
152
153 m_ptr = &media_list[media_id];
154 m_ptr->type_id = media_type;
155 m_ptr->send_msg = send_msg;
156 m_ptr->enable_bearer = enable;
157 m_ptr->disable_bearer = disable;
158 m_ptr->addr2str = addr2str;
159 memcpy(&m_ptr->bcast_addr, bcast_addr, sizeof(*bcast_addr));
160 m_ptr->bcast = 1;
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;
165 dbg("Media <%s> registered\n", name);
166 res = 0;
167exit:
Per Liden4323add2006-01-18 00:38:21 +0100168 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100169 return res;
170}
171
172/**
Per Liden4323add2006-01-18 00:38:21 +0100173 * tipc_media_addr_printf - record media address in print buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100174 */
175
Per Liden4323add2006-01-18 00:38:21 +0100176void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100177{
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
191 tipc_printf(pb, "%s(%s) ", m_ptr->name,
192 m_ptr->addr2str(a, addr_str, sizeof(addr_str)));
193 } else {
194 unchar *addr = (unchar *)&a->dev_addr;
195
196 tipc_printf(pb, "UNKNOWN(%u):", media_type);
197 for (i = 0; i < (sizeof(*a) - sizeof(a->type)); i++) {
198 tipc_printf(pb, "%02x ", addr[i]);
199 }
200 }
201}
202
203/**
Per Liden4323add2006-01-18 00:38:21 +0100204 * tipc_media_get_names - record names of registered media in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100205 */
206
Per Liden4323add2006-01-18 00:38:21 +0100207struct sk_buff *tipc_media_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100208{
209 struct sk_buff *buf;
210 struct media *m_ptr;
211 int i;
212
Per Liden4323add2006-01-18 00:38:21 +0100213 buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100214 if (!buf)
215 return NULL;
216
Per Liden4323add2006-01-18 00:38:21 +0100217 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100218 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
Per Liden4323add2006-01-18 00:38:21 +0100219 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, m_ptr->name,
220 strlen(m_ptr->name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100221 }
Per Liden4323add2006-01-18 00:38:21 +0100222 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100223 return buf;
224}
225
226/**
227 * bearer_name_validate - validate & (optionally) deconstruct bearer name
228 * @name - ptr to bearer name string
229 * @name_parts - ptr to area for bearer name components (or NULL if not needed)
230 *
231 * Returns 1 if bearer name is valid, otherwise 0.
232 */
233
234static int bearer_name_validate(const char *name,
235 struct bearer_name *name_parts)
236{
237 char name_copy[TIPC_MAX_BEARER_NAME];
238 char *media_name;
239 char *if_name;
240 u32 media_len;
241 u32 if_len;
242
243 /* copy bearer name & ensure length is OK */
244
245 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
246 /* need above in case non-Posix strncpy() doesn't pad with nulls */
247 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
248 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
249 return 0;
250
251 /* ensure all component parts of bearer name are present */
252
253 media_name = name_copy;
254 if ((if_name = strchr(media_name, ':')) == NULL)
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
262 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
263 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) ||
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
281static struct bearer *bearer_find(const char *name)
282{
283 struct bearer *b_ptr;
284 u32 i;
285
Per Liden4323add2006-01-18 00:38:21 +0100286 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100287 if (b_ptr->active && (!strcmp(b_ptr->publ.name, name)))
288 return b_ptr;
289 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800290 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100291}
292
293/**
Per Liden4323add2006-01-18 00:38:21 +0100294 * tipc_bearer_find_interface - locates bearer object with matching interface name
Per Lidenb97bf3f2006-01-02 19:04:38 +0100295 */
296
Per Liden4323add2006-01-18 00:38:21 +0100297struct bearer *tipc_bearer_find_interface(const char *if_name)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100298{
299 struct bearer *b_ptr;
300 char *b_if_name;
301 u32 i;
302
Per Liden4323add2006-01-18 00:38:21 +0100303 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100304 if (!b_ptr->active)
305 continue;
306 b_if_name = strchr(b_ptr->publ.name, ':') + 1;
307 if (!strcmp(b_if_name, if_name))
308 return b_ptr;
309 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800310 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100311}
312
313/**
Per Liden4323add2006-01-18 00:38:21 +0100314 * tipc_bearer_get_names - record names of bearers in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100315 */
316
Per Liden4323add2006-01-18 00:38:21 +0100317struct sk_buff *tipc_bearer_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100318{
319 struct sk_buff *buf;
320 struct media *m_ptr;
321 struct bearer *b_ptr;
322 int i, j;
323
Per Liden4323add2006-01-18 00:38:21 +0100324 buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100325 if (!buf)
326 return NULL;
327
Per Liden4323add2006-01-18 00:38:21 +0100328 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100329 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
330 for (j = 0; j < MAX_BEARERS; j++) {
Per Liden4323add2006-01-18 00:38:21 +0100331 b_ptr = &tipc_bearers[j];
Per Lidenb97bf3f2006-01-02 19:04:38 +0100332 if (b_ptr->active && (b_ptr->media == m_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +0100333 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
334 b_ptr->publ.name,
335 strlen(b_ptr->publ.name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100336 }
337 }
338 }
Per Liden4323add2006-01-18 00:38:21 +0100339 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100340 return buf;
341}
342
Per Liden4323add2006-01-18 00:38:21 +0100343void tipc_bearer_add_dest(struct bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100344{
Per Liden4323add2006-01-18 00:38:21 +0100345 tipc_nmap_add(&b_ptr->nodes, dest);
346 tipc_disc_update_link_req(b_ptr->link_req);
347 tipc_bcbearer_sort();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100348}
349
Per Liden4323add2006-01-18 00:38:21 +0100350void tipc_bearer_remove_dest(struct bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100351{
Per Liden4323add2006-01-18 00:38:21 +0100352 tipc_nmap_remove(&b_ptr->nodes, dest);
353 tipc_disc_update_link_req(b_ptr->link_req);
354 tipc_bcbearer_sort();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100355}
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.
Per Liden4323add2006-01-18 00:38:21 +0100361 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100362 * bearer.lock must be taken before calling
363 * Returns binary true(1) ore false(0)
364 */
365static int bearer_push(struct bearer *b_ptr)
366{
367 u32 res = TIPC_OK;
368 struct link *ln, *tln;
369
370 if (b_ptr->publ.blocked)
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) {
Per Liden4323add2006-01-18 00:38:21 +0100375 res = tipc_link_push_packet(ln);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100376 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
Per Liden4323add2006-01-18 00:38:21 +0100385void tipc_bearer_lock_push(struct bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100386{
387 int res;
388
389 spin_lock_bh(&b_ptr->publ.lock);
390 res = bearer_push(b_ptr);
391 spin_unlock_bh(&b_ptr->publ.lock);
392 if (res)
Per Liden4323add2006-01-18 00:38:21 +0100393 tipc_bcbearer_push();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100394}
395
396
397/*
398 * Interrupt enabling new requests after bearer congestion or blocking:
399 * See bearer_send().
400 */
401void tipc_continue(struct tipc_bearer *tb_ptr)
402{
403 struct bearer *b_ptr = (struct bearer *)tb_ptr;
404
405 spin_lock_bh(&b_ptr->publ.lock);
406 b_ptr->continue_count++;
407 if (!list_empty(&b_ptr->cong_links))
Per Liden4323add2006-01-18 00:38:21 +0100408 tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100409 b_ptr->publ.blocked = 0;
410 spin_unlock_bh(&b_ptr->publ.lock);
411}
412
413/*
414 * Schedule link for sending of messages after the bearer
415 * has been deblocked by 'continue()'. This method is called
416 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100417 * the bearer is congested. 'tipc_net_lock' is in read_lock here
Per Lidenb97bf3f2006-01-02 19:04:38 +0100418 * bearer.lock is busy
419 */
420
Per Liden4323add2006-01-18 00:38:21 +0100421static void tipc_bearer_schedule_unlocked(struct bearer *b_ptr, struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100422{
423 list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
424}
425
426/*
427 * Schedule link for sending of messages after the bearer
428 * has been deblocked by 'continue()'. This method is called
429 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100430 * the bearer is congested. 'tipc_net_lock' is in read_lock here,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100431 * bearer.lock is free
432 */
433
Per Liden4323add2006-01-18 00:38:21 +0100434void tipc_bearer_schedule(struct bearer *b_ptr, struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100435{
436 spin_lock_bh(&b_ptr->publ.lock);
Per Liden4323add2006-01-18 00:38:21 +0100437 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100438 spin_unlock_bh(&b_ptr->publ.lock);
439}
440
441
442/*
Per Liden4323add2006-01-18 00:38:21 +0100443 * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100444 * and if there is, try to resolve it before returning.
Per Liden4323add2006-01-18 00:38:21 +0100445 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100446 */
Per Liden4323add2006-01-18 00:38:21 +0100447int tipc_bearer_resolve_congestion(struct bearer *b_ptr, struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100448{
449 int res = 1;
450
451 if (list_empty(&b_ptr->cong_links))
452 return 1;
453 spin_lock_bh(&b_ptr->publ.lock);
454 if (!bearer_push(b_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +0100455 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100456 res = 0;
457 }
458 spin_unlock_bh(&b_ptr->publ.lock);
459 return res;
460}
461
462
463/**
464 * tipc_enable_bearer - enable bearer with the given name
465 */
466
467int tipc_enable_bearer(const char *name, u32 bcast_scope, u32 priority)
468{
469 struct bearer *b_ptr;
470 struct media *m_ptr;
471 struct bearer_name b_name;
472 char addr_string[16];
473 u32 bearer_id;
474 u32 with_this_prio;
475 u32 i;
476 int res = -EINVAL;
477
478 if (tipc_mode != TIPC_NET_MODE)
479 return -ENOPROTOOPT;
Per Liden16cb4b32006-01-13 22:22:22 +0100480
Per Lidenb97bf3f2006-01-02 19:04:38 +0100481 if (!bearer_name_validate(name, &b_name) ||
Per Liden4323add2006-01-18 00:38:21 +0100482 !tipc_addr_domain_valid(bcast_scope) ||
Per Liden16cb4b32006-01-13 22:22:22 +0100483 !in_scope(bcast_scope, tipc_own_addr))
484 return -EINVAL;
485
486 if ((priority < TIPC_MIN_LINK_PRI ||
487 priority > TIPC_MAX_LINK_PRI) &&
488 (priority != TIPC_MEDIA_LINK_PRI))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100489 return -EINVAL;
490
Per Liden4323add2006-01-18 00:38:21 +0100491 write_lock_bh(&tipc_net_lock);
492 if (!tipc_bearers)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100493 goto failed;
494
495 m_ptr = media_find(b_name.media_name);
496 if (!m_ptr) {
497 warn("No media <%s>\n", b_name.media_name);
498 goto failed;
499 }
Per Liden16cb4b32006-01-13 22:22:22 +0100500
501 if (priority == TIPC_MEDIA_LINK_PRI)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100502 priority = m_ptr->priority;
503
504restart:
505 bearer_id = MAX_BEARERS;
506 with_this_prio = 1;
507 for (i = MAX_BEARERS; i-- != 0; ) {
Per Liden4323add2006-01-18 00:38:21 +0100508 if (!tipc_bearers[i].active) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100509 bearer_id = i;
510 continue;
511 }
Per Liden4323add2006-01-18 00:38:21 +0100512 if (!strcmp(name, tipc_bearers[i].publ.name)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100513 warn("Bearer <%s> already enabled\n", name);
514 goto failed;
515 }
Per Liden4323add2006-01-18 00:38:21 +0100516 if ((tipc_bearers[i].priority == priority) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100517 (++with_this_prio > 2)) {
518 if (priority-- == 0) {
519 warn("Third bearer <%s> with priority %u, unable to lower to %u\n",
520 name, priority + 1, priority);
521 goto failed;
522 }
523 warn("Third bearer <%s> with priority %u, lowering to %u\n",
524 name, priority + 1, priority);
525 goto restart;
526 }
527 }
528 if (bearer_id >= MAX_BEARERS) {
529 warn("Attempt to enable more than %d bearers\n", MAX_BEARERS);
530 goto failed;
531 }
532
Per Liden4323add2006-01-18 00:38:21 +0100533 b_ptr = &tipc_bearers[bearer_id];
Per Lidenb97bf3f2006-01-02 19:04:38 +0100534 memset(b_ptr, 0, sizeof(struct bearer));
535
536 strcpy(b_ptr->publ.name, name);
537 res = m_ptr->enable_bearer(&b_ptr->publ);
538 if (res) {
539 warn("Failed to enable bearer <%s>\n", name);
540 goto failed;
541 }
542
543 b_ptr->identity = bearer_id;
544 b_ptr->media = m_ptr;
545 b_ptr->net_plane = bearer_id + 'A';
546 b_ptr->active = 1;
547 b_ptr->detect_scope = bcast_scope;
548 b_ptr->priority = priority;
549 INIT_LIST_HEAD(&b_ptr->cong_links);
550 INIT_LIST_HEAD(&b_ptr->links);
551 if (m_ptr->bcast) {
Per Liden4323add2006-01-18 00:38:21 +0100552 b_ptr->link_req = tipc_disc_init_link_req(b_ptr, &m_ptr->bcast_addr,
553 bcast_scope, 2);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100554 }
555 b_ptr->publ.lock = SPIN_LOCK_UNLOCKED;
Per Liden4323add2006-01-18 00:38:21 +0100556 write_unlock_bh(&tipc_net_lock);
Per Liden16cb4b32006-01-13 22:22:22 +0100557 info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
558 name, addr_string_fill(addr_string, bcast_scope), priority);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100559 return 0;
560failed:
Per Liden4323add2006-01-18 00:38:21 +0100561 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100562 return res;
563}
564
565/**
566 * tipc_block_bearer(): Block the bearer with the given name,
567 * and reset all its links
568 */
569
570int tipc_block_bearer(const char *name)
571{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800572 struct bearer *b_ptr = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100573 struct link *l_ptr;
574 struct link *temp_l_ptr;
575
576 if (tipc_mode != TIPC_NET_MODE)
577 return -ENOPROTOOPT;
578
Per Liden4323add2006-01-18 00:38:21 +0100579 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100580 b_ptr = bearer_find(name);
581 if (!b_ptr) {
582 warn("Attempt to block unknown bearer <%s>\n", name);
Per Liden4323add2006-01-18 00:38:21 +0100583 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100584 return -EINVAL;
585 }
586
587 spin_lock_bh(&b_ptr->publ.lock);
588 b_ptr->publ.blocked = 1;
589 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
590 struct node *n_ptr = l_ptr->owner;
591
592 spin_lock_bh(&n_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100593 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100594 spin_unlock_bh(&n_ptr->lock);
595 }
596 spin_unlock_bh(&b_ptr->publ.lock);
Per Liden4323add2006-01-18 00:38:21 +0100597 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100598 info("Blocked bearer <%s>\n", name);
599 return TIPC_OK;
600}
601
602/**
603 * bearer_disable -
604 *
Per Liden4323add2006-01-18 00:38:21 +0100605 * Note: This routine assumes caller holds tipc_net_lock.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100606 */
607
608static int bearer_disable(const char *name)
609{
610 struct bearer *b_ptr;
611 struct link *l_ptr;
612 struct link *temp_l_ptr;
613
614 if (tipc_mode != TIPC_NET_MODE)
615 return -ENOPROTOOPT;
616
617 b_ptr = bearer_find(name);
618 if (!b_ptr) {
619 warn("Attempt to disable unknown bearer <%s>\n", name);
620 return -EINVAL;
621 }
622
Per Liden4323add2006-01-18 00:38:21 +0100623 tipc_disc_stop_link_req(b_ptr->link_req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100624 spin_lock_bh(&b_ptr->publ.lock);
625 b_ptr->link_req = NULL;
626 b_ptr->publ.blocked = 1;
627 if (b_ptr->media->disable_bearer) {
628 spin_unlock_bh(&b_ptr->publ.lock);
Per Liden4323add2006-01-18 00:38:21 +0100629 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100630 b_ptr->media->disable_bearer(&b_ptr->publ);
Per Liden4323add2006-01-18 00:38:21 +0100631 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100632 spin_lock_bh(&b_ptr->publ.lock);
633 }
634 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100635 tipc_link_delete(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100636 }
637 spin_unlock_bh(&b_ptr->publ.lock);
638 info("Disabled bearer <%s>\n", name);
639 memset(b_ptr, 0, sizeof(struct bearer));
640 return TIPC_OK;
641}
642
643int tipc_disable_bearer(const char *name)
644{
645 int res;
646
Per Liden4323add2006-01-18 00:38:21 +0100647 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100648 res = bearer_disable(name);
Per Liden4323add2006-01-18 00:38:21 +0100649 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100650 return res;
651}
652
653
654
Per Liden4323add2006-01-18 00:38:21 +0100655int tipc_bearer_init(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100656{
657 int res;
658
Per Liden4323add2006-01-18 00:38:21 +0100659 write_lock_bh(&tipc_net_lock);
660 tipc_bearers = kmalloc(MAX_BEARERS * sizeof(struct bearer), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100661 media_list = kmalloc(MAX_MEDIA * sizeof(struct media), GFP_ATOMIC);
Per Liden4323add2006-01-18 00:38:21 +0100662 if (tipc_bearers && media_list) {
663 memset(tipc_bearers, 0, MAX_BEARERS * sizeof(struct bearer));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100664 memset(media_list, 0, MAX_MEDIA * sizeof(struct media));
665 res = TIPC_OK;
666 } else {
Per Liden4323add2006-01-18 00:38:21 +0100667 kfree(tipc_bearers);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100668 kfree(media_list);
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800669 tipc_bearers = NULL;
670 media_list = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100671 res = -ENOMEM;
672 }
Per Liden4323add2006-01-18 00:38:21 +0100673 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100674 return res;
675}
676
Per Liden4323add2006-01-18 00:38:21 +0100677void tipc_bearer_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100678{
679 u32 i;
680
Per Liden4323add2006-01-18 00:38:21 +0100681 if (!tipc_bearers)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100682 return;
683
684 for (i = 0; i < MAX_BEARERS; i++) {
Per Liden4323add2006-01-18 00:38:21 +0100685 if (tipc_bearers[i].active)
686 tipc_bearers[i].publ.blocked = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100687 }
688 for (i = 0; i < MAX_BEARERS; i++) {
Per Liden4323add2006-01-18 00:38:21 +0100689 if (tipc_bearers[i].active)
690 bearer_disable(tipc_bearers[i].publ.name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100691 }
Per Liden4323add2006-01-18 00:38:21 +0100692 kfree(tipc_bearers);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100693 kfree(media_list);
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800694 tipc_bearers = NULL;
695 media_list = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100696 media_count = 0;
697}
698
699