linux/net/tipc/bearer.c
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   1/*
   2 * net/tipc/bearer.c: TIPC bearer code
   3 *
   4 * Copyright (c) 1996-2006, Ericsson AB
   5 * Copyright (c) 2004-2006, Wind River Systems
   6 * All rights reserved.
   7 *
   8 * Redistribution and use in source and binary forms, with or without
   9 * modification, are permitted provided that the following conditions are met:
  10 *
  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.
  19 *
  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
  34 * 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
  48static struct media media_list[MAX_MEDIA];
  49static u32 media_count = 0;
  50
  51struct bearer tipc_bearers[MAX_BEARERS];
  52
  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        }
  82        return NULL;
  83}
  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
 110        write_lock_bh(&tipc_net_lock);
 111
 112        if (tipc_mode != TIPC_NET_MODE) {
 113                warn("Media <%s> rejected, not in networked mode yet\n", name);
 114                goto exit;
 115        }
 116        if (!media_name_valid(name)) {
 117                warn("Media <%s> rejected, illegal name\n", name);
 118                goto exit;
 119        }
 120        if (!bcast_addr) {
 121                warn("Media <%s> rejected, no broadcast address\n", name);
 122                goto exit;
 123        }
 124        if ((bearer_priority < TIPC_MIN_LINK_PRI) ||
 125            (bearer_priority > TIPC_MAX_LINK_PRI)) {
 126                warn("Media <%s> rejected, illegal priority (%u)\n", name,
 127                     bearer_priority);
 128                goto exit;
 129        }
 130        if ((link_tolerance < TIPC_MIN_LINK_TOL) ||
 131            (link_tolerance > TIPC_MAX_LINK_TOL)) {
 132                warn("Media <%s> rejected, illegal tolerance (%u)\n", name,
 133                     link_tolerance);
 134                goto exit;
 135        }
 136
 137        media_id = media_count++;
 138        if (media_id >= MAX_MEDIA) {
 139                warn("Media <%s> rejected, media limit reached (%u)\n", name,
 140                     MAX_MEDIA);
 141                media_count--;
 142                goto exit;
 143        }
 144        for (i = 0; i < media_id; i++) {
 145                if (media_list[i].type_id == media_type) {
 146                        warn("Media <%s> rejected, duplicate type (%u)\n", name,
 147                             media_type);
 148                        media_count--;
 149                        goto exit;
 150                }
 151                if (!strcmp(name, media_list[i].name)) {
 152                        warn("Media <%s> rejected, duplicate name\n", name);
 153                        media_count--;
 154                        goto exit;
 155                }
 156        }
 157
 158        m_ptr = &media_list[media_id];
 159        m_ptr->type_id = media_type;
 160        m_ptr->send_msg = send_msg;
 161        m_ptr->enable_bearer = enable;
 162        m_ptr->disable_bearer = disable;
 163        m_ptr->addr2str = addr2str;
 164        memcpy(&m_ptr->bcast_addr, bcast_addr, sizeof(*bcast_addr));
 165        m_ptr->bcast = 1;
 166        strcpy(m_ptr->name, name);
 167        m_ptr->priority = bearer_priority;
 168        m_ptr->tolerance = link_tolerance;
 169        m_ptr->window = send_window_limit;
 170        dbg("Media <%s> registered\n", name);
 171        res = 0;
 172exit:
 173        write_unlock_bh(&tipc_net_lock);
 174        return res;
 175}
 176
 177/**
 178 * tipc_media_addr_printf - record media address in print buffer
 179 */
 180
 181void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a)
 182{
 183        struct media *m_ptr;
 184        u32 media_type;
 185        u32 i;
 186
 187        media_type = ntohl(a->type);
 188        for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
 189                if (m_ptr->type_id == media_type)
 190                        break;
 191        }
 192
 193        if ((i < media_count) && (m_ptr->addr2str != NULL)) {
 194                char addr_str[MAX_ADDR_STR];
 195
 196                tipc_printf(pb, "%s(%s)", m_ptr->name,
 197                            m_ptr->addr2str(a, addr_str, sizeof(addr_str)));
 198        } else {
 199                unchar *addr = (unchar *)&a->dev_addr;
 200
 201                tipc_printf(pb, "UNKNOWN(%u)", media_type);
 202                for (i = 0; i < (sizeof(*a) - sizeof(a->type)); i++) {
 203                        tipc_printf(pb, "-%02x", addr[i]);
 204                }
 205        }
 206}
 207
 208/**
 209 * tipc_media_get_names - record names of registered media in buffer
 210 */
 211
 212struct sk_buff *tipc_media_get_names(void)
 213{
 214        struct sk_buff *buf;
 215        struct media *m_ptr;
 216        int i;
 217
 218        buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
 219        if (!buf)
 220                return NULL;
 221
 222        read_lock_bh(&tipc_net_lock);
 223        for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
 224                tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, m_ptr->name,
 225                                    strlen(m_ptr->name) + 1);
 226        }
 227        read_unlock_bh(&tipc_net_lock);
 228        return buf;
 229}
 230
 231/**
 232 * bearer_name_validate - validate & (optionally) deconstruct bearer name
 233 * @name - ptr to bearer name string
 234 * @name_parts - ptr to area for bearer name components (or NULL if not needed)
 235 *
 236 * Returns 1 if bearer name is valid, otherwise 0.
 237 */
 238
 239static int bearer_name_validate(const char *name,
 240                                struct bearer_name *name_parts)
 241{
 242        char name_copy[TIPC_MAX_BEARER_NAME];
 243        char *media_name;
 244        char *if_name;
 245        u32 media_len;
 246        u32 if_len;
 247
 248        /* copy bearer name & ensure length is OK */
 249
 250        name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 251        /* need above in case non-Posix strncpy() doesn't pad with nulls */
 252        strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 253        if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 254                return 0;
 255
 256        /* ensure all component parts of bearer name are present */
 257
 258        media_name = name_copy;
 259        if ((if_name = strchr(media_name, ':')) == NULL)
 260                return 0;
 261        *(if_name++) = 0;
 262        media_len = if_name - media_name;
 263        if_len = strlen(if_name) + 1;
 264
 265        /* validate component parts of bearer name */
 266
 267        if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 268            (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) ||
 269            (strspn(media_name, tipc_alphabet) != (media_len - 1)) ||
 270            (strspn(if_name, tipc_alphabet) != (if_len - 1)))
 271                return 0;
 272
 273        /* return bearer name components, if necessary */
 274
 275        if (name_parts) {
 276                strcpy(name_parts->media_name, media_name);
 277                strcpy(name_parts->if_name, if_name);
 278        }
 279        return 1;
 280}
 281
 282/**
 283 * bearer_find - locates bearer object with matching bearer name
 284 */
 285
 286static struct bearer *bearer_find(const char *name)
 287{
 288        struct bearer *b_ptr;
 289        u32 i;
 290
 291        if (tipc_mode != TIPC_NET_MODE)
 292                return NULL;
 293
 294        for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
 295                if (b_ptr->active && (!strcmp(b_ptr->publ.name, name)))
 296                        return b_ptr;
 297        }
 298        return NULL;
 299}
 300
 301/**
 302 * tipc_bearer_find_interface - locates bearer object with matching interface name
 303 */
 304
 305struct bearer *tipc_bearer_find_interface(const char *if_name)
 306{
 307        struct bearer *b_ptr;
 308        char *b_if_name;
 309        u32 i;
 310
 311        for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
 312                if (!b_ptr->active)
 313                        continue;
 314                b_if_name = strchr(b_ptr->publ.name, ':') + 1;
 315                if (!strcmp(b_if_name, if_name))
 316                        return b_ptr;
 317        }
 318        return NULL;
 319}
 320
 321/**
 322 * tipc_bearer_get_names - record names of bearers in buffer
 323 */
 324
 325struct sk_buff *tipc_bearer_get_names(void)
 326{
 327        struct sk_buff *buf;
 328        struct media *m_ptr;
 329        struct bearer *b_ptr;
 330        int i, j;
 331
 332        buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
 333        if (!buf)
 334                return NULL;
 335
 336        read_lock_bh(&tipc_net_lock);
 337        for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
 338                for (j = 0; j < MAX_BEARERS; j++) {
 339                        b_ptr = &tipc_bearers[j];
 340                        if (b_ptr->active && (b_ptr->media == m_ptr)) {
 341                                tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
 342                                                    b_ptr->publ.name,
 343                                                    strlen(b_ptr->publ.name) + 1);
 344                        }
 345                }
 346        }
 347        read_unlock_bh(&tipc_net_lock);
 348        return buf;
 349}
 350
 351void tipc_bearer_add_dest(struct bearer *b_ptr, u32 dest)
 352{
 353        tipc_nmap_add(&b_ptr->nodes, dest);
 354        tipc_disc_update_link_req(b_ptr->link_req);
 355        tipc_bcbearer_sort();
 356}
 357
 358void tipc_bearer_remove_dest(struct bearer *b_ptr, u32 dest)
 359{
 360        tipc_nmap_remove(&b_ptr->nodes, dest);
 361        tipc_disc_update_link_req(b_ptr->link_req);
 362        tipc_bcbearer_sort();
 363}
 364
 365/*
 366 * bearer_push(): Resolve bearer congestion. Force the waiting
 367 * links to push out their unsent packets, one packet per link
 368 * per iteration, until all packets are gone or congestion reoccurs.
 369 * 'tipc_net_lock' is read_locked when this function is called
 370 * bearer.lock must be taken before calling
 371 * Returns binary true(1) ore false(0)
 372 */
 373static int bearer_push(struct bearer *b_ptr)
 374{
 375        u32 res = 0;
 376        struct link *ln, *tln;
 377
 378        if (b_ptr->publ.blocked)
 379                return 0;
 380
 381        while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) {
 382                list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) {
 383                        res = tipc_link_push_packet(ln);
 384                        if (res == PUSH_FAILED)
 385                                break;
 386                        if (res == PUSH_FINISHED)
 387                                list_move_tail(&ln->link_list, &b_ptr->links);
 388                }
 389        }
 390        return list_empty(&b_ptr->cong_links);
 391}
 392
 393void tipc_bearer_lock_push(struct bearer *b_ptr)
 394{
 395        int res;
 396
 397        spin_lock_bh(&b_ptr->publ.lock);
 398        res = bearer_push(b_ptr);
 399        spin_unlock_bh(&b_ptr->publ.lock);
 400        if (res)
 401                tipc_bcbearer_push();
 402}
 403
 404
 405/*
 406 * Interrupt enabling new requests after bearer congestion or blocking:
 407 * See bearer_send().
 408 */
 409void tipc_continue(struct tipc_bearer *tb_ptr)
 410{
 411        struct bearer *b_ptr = (struct bearer *)tb_ptr;
 412
 413        spin_lock_bh(&b_ptr->publ.lock);
 414        b_ptr->continue_count++;
 415        if (!list_empty(&b_ptr->cong_links))
 416                tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
 417        b_ptr->publ.blocked = 0;
 418        spin_unlock_bh(&b_ptr->publ.lock);
 419}
 420
 421/*
 422 * Schedule link for sending of messages after the bearer
 423 * has been deblocked by 'continue()'. This method is called
 424 * when somebody tries to send a message via this link while
 425 * the bearer is congested. 'tipc_net_lock' is in read_lock here
 426 * bearer.lock is busy
 427 */
 428
 429static void tipc_bearer_schedule_unlocked(struct bearer *b_ptr, struct link *l_ptr)
 430{
 431        list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
 432}
 433
 434/*
 435 * Schedule link for sending of messages after the bearer
 436 * has been deblocked by 'continue()'. This method is called
 437 * when somebody tries to send a message via this link while
 438 * the bearer is congested. 'tipc_net_lock' is in read_lock here,
 439 * bearer.lock is free
 440 */
 441
 442void tipc_bearer_schedule(struct bearer *b_ptr, struct link *l_ptr)
 443{
 444        spin_lock_bh(&b_ptr->publ.lock);
 445        tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
 446        spin_unlock_bh(&b_ptr->publ.lock);
 447}
 448
 449
 450/*
 451 * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
 452 * and if there is, try to resolve it before returning.
 453 * 'tipc_net_lock' is read_locked when this function is called
 454 */
 455int tipc_bearer_resolve_congestion(struct bearer *b_ptr, struct link *l_ptr)
 456{
 457        int res = 1;
 458
 459        if (list_empty(&b_ptr->cong_links))
 460                return 1;
 461        spin_lock_bh(&b_ptr->publ.lock);
 462        if (!bearer_push(b_ptr)) {
 463                tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
 464                res = 0;
 465        }
 466        spin_unlock_bh(&b_ptr->publ.lock);
 467        return res;
 468}
 469
 470/**
 471 * tipc_bearer_congested - determines if bearer is currently congested
 472 */
 473
 474int tipc_bearer_congested(struct bearer *b_ptr, struct link *l_ptr)
 475{
 476        if (unlikely(b_ptr->publ.blocked))
 477                return 1;
 478        if (likely(list_empty(&b_ptr->cong_links)))
 479                return 0;
 480        return !tipc_bearer_resolve_congestion(b_ptr, l_ptr);
 481}
 482
 483/**
 484 * tipc_enable_bearer - enable bearer with the given name
 485 */
 486
 487int tipc_enable_bearer(const char *name, u32 bcast_scope, u32 priority)
 488{
 489        struct bearer *b_ptr;
 490        struct media *m_ptr;
 491        struct bearer_name b_name;
 492        char addr_string[16];
 493        u32 bearer_id;
 494        u32 with_this_prio;
 495        u32 i;
 496        int res = -EINVAL;
 497
 498        if (tipc_mode != TIPC_NET_MODE) {
 499                warn("Bearer <%s> rejected, not supported in standalone mode\n",
 500                     name);
 501                return -ENOPROTOOPT;
 502        }
 503        if (!bearer_name_validate(name, &b_name)) {
 504                warn("Bearer <%s> rejected, illegal name\n", name);
 505                return -EINVAL;
 506        }
 507        if (!tipc_addr_domain_valid(bcast_scope) ||
 508            !tipc_in_scope(bcast_scope, tipc_own_addr)) {
 509                warn("Bearer <%s> rejected, illegal broadcast scope\n", name);
 510                return -EINVAL;
 511        }
 512        if ((priority < TIPC_MIN_LINK_PRI ||
 513             priority > TIPC_MAX_LINK_PRI) &&
 514            (priority != TIPC_MEDIA_LINK_PRI)) {
 515                warn("Bearer <%s> rejected, illegal priority\n", name);
 516                return -EINVAL;
 517        }
 518
 519        write_lock_bh(&tipc_net_lock);
 520
 521        m_ptr = media_find(b_name.media_name);
 522        if (!m_ptr) {
 523                warn("Bearer <%s> rejected, media <%s> not registered\n", name,
 524                     b_name.media_name);
 525                goto failed;
 526        }
 527
 528        if (priority == TIPC_MEDIA_LINK_PRI)
 529                priority = m_ptr->priority;
 530
 531restart:
 532        bearer_id = MAX_BEARERS;
 533        with_this_prio = 1;
 534        for (i = MAX_BEARERS; i-- != 0; ) {
 535                if (!tipc_bearers[i].active) {
 536                        bearer_id = i;
 537                        continue;
 538                }
 539                if (!strcmp(name, tipc_bearers[i].publ.name)) {
 540                        warn("Bearer <%s> rejected, already enabled\n", name);
 541                        goto failed;
 542                }
 543                if ((tipc_bearers[i].priority == priority) &&
 544                    (++with_this_prio > 2)) {
 545                        if (priority-- == 0) {
 546                                warn("Bearer <%s> rejected, duplicate priority\n",
 547                                     name);
 548                                goto failed;
 549                        }
 550                        warn("Bearer <%s> priority adjustment required %u->%u\n",
 551                             name, priority + 1, priority);
 552                        goto restart;
 553                }
 554        }
 555        if (bearer_id >= MAX_BEARERS) {
 556                warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 557                     name, MAX_BEARERS);
 558                goto failed;
 559        }
 560
 561        b_ptr = &tipc_bearers[bearer_id];
 562        memset(b_ptr, 0, sizeof(struct bearer));
 563
 564        strcpy(b_ptr->publ.name, name);
 565        res = m_ptr->enable_bearer(&b_ptr->publ);
 566        if (res) {
 567                warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res);
 568                goto failed;
 569        }
 570
 571        b_ptr->identity = bearer_id;
 572        b_ptr->media = m_ptr;
 573        b_ptr->net_plane = bearer_id + 'A';
 574        b_ptr->active = 1;
 575        b_ptr->detect_scope = bcast_scope;
 576        b_ptr->priority = priority;
 577        INIT_LIST_HEAD(&b_ptr->cong_links);
 578        INIT_LIST_HEAD(&b_ptr->links);
 579        if (m_ptr->bcast) {
 580                b_ptr->link_req = tipc_disc_init_link_req(b_ptr, &m_ptr->bcast_addr,
 581                                                          bcast_scope, 2);
 582        }
 583        spin_lock_init(&b_ptr->publ.lock);
 584        write_unlock_bh(&tipc_net_lock);
 585        info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 586             name, tipc_addr_string_fill(addr_string, bcast_scope), priority);
 587        return 0;
 588failed:
 589        write_unlock_bh(&tipc_net_lock);
 590        return res;
 591}
 592
 593/**
 594 * tipc_block_bearer(): Block the bearer with the given name,
 595 *                      and reset all its links
 596 */
 597
 598int tipc_block_bearer(const char *name)
 599{
 600        struct bearer *b_ptr = NULL;
 601        struct link *l_ptr;
 602        struct link *temp_l_ptr;
 603
 604        read_lock_bh(&tipc_net_lock);
 605        b_ptr = bearer_find(name);
 606        if (!b_ptr) {
 607                warn("Attempt to block unknown bearer <%s>\n", name);
 608                read_unlock_bh(&tipc_net_lock);
 609                return -EINVAL;
 610        }
 611
 612        info("Blocking bearer <%s>\n", name);
 613        spin_lock_bh(&b_ptr->publ.lock);
 614        b_ptr->publ.blocked = 1;
 615        list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
 616                struct tipc_node *n_ptr = l_ptr->owner;
 617
 618                spin_lock_bh(&n_ptr->lock);
 619                tipc_link_reset(l_ptr);
 620                spin_unlock_bh(&n_ptr->lock);
 621        }
 622        spin_unlock_bh(&b_ptr->publ.lock);
 623        read_unlock_bh(&tipc_net_lock);
 624        return 0;
 625}
 626
 627/**
 628 * bearer_disable -
 629 *
 630 * Note: This routine assumes caller holds tipc_net_lock.
 631 */
 632
 633static int bearer_disable(const char *name)
 634{
 635        struct bearer *b_ptr;
 636        struct link *l_ptr;
 637        struct link *temp_l_ptr;
 638
 639        b_ptr = bearer_find(name);
 640        if (!b_ptr) {
 641                warn("Attempt to disable unknown bearer <%s>\n", name);
 642                return -EINVAL;
 643        }
 644
 645        info("Disabling bearer <%s>\n", name);
 646        tipc_disc_stop_link_req(b_ptr->link_req);
 647        spin_lock_bh(&b_ptr->publ.lock);
 648        b_ptr->link_req = NULL;
 649        b_ptr->publ.blocked = 1;
 650        if (b_ptr->media->disable_bearer) {
 651                spin_unlock_bh(&b_ptr->publ.lock);
 652                write_unlock_bh(&tipc_net_lock);
 653                b_ptr->media->disable_bearer(&b_ptr->publ);
 654                write_lock_bh(&tipc_net_lock);
 655                spin_lock_bh(&b_ptr->publ.lock);
 656        }
 657        list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
 658                tipc_link_delete(l_ptr);
 659        }
 660        spin_unlock_bh(&b_ptr->publ.lock);
 661        memset(b_ptr, 0, sizeof(struct bearer));
 662        return 0;
 663}
 664
 665int tipc_disable_bearer(const char *name)
 666{
 667        int res;
 668
 669        write_lock_bh(&tipc_net_lock);
 670        res = bearer_disable(name);
 671        write_unlock_bh(&tipc_net_lock);
 672        return res;
 673}
 674
 675
 676
 677void tipc_bearer_stop(void)
 678{
 679        u32 i;
 680
 681        for (i = 0; i < MAX_BEARERS; i++) {
 682                if (tipc_bearers[i].active)
 683                        tipc_bearers[i].publ.blocked = 1;
 684        }
 685        for (i = 0; i < MAX_BEARERS; i++) {
 686                if (tipc_bearers[i].active)
 687                        bearer_disable(tipc_bearers[i].publ.name);
 688        }
 689        media_count = 0;
 690}
 691
 692
 693