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 = NULL;
  49static u32 media_count = 0;
  50
  51struct bearer *tipc_bearers = NULL;
  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        if (!media_list)
 112                goto exit;
 113
 114        if (!media_name_valid(name)) {
 115                warn("Media <%s> rejected, illegal name\n", name);
 116                goto exit;
 117        }
 118        if (!bcast_addr) {
 119                warn("Media <%s> rejected, no broadcast address\n", name);
 120                goto exit;
 121        }
 122        if ((bearer_priority < TIPC_MIN_LINK_PRI) &&
 123            (bearer_priority > TIPC_MAX_LINK_PRI)) {
 124                warn("Media <%s> rejected, illegal priority (%u)\n", name,
 125                     bearer_priority);
 126                goto exit;
 127        }
 128        if ((link_tolerance < TIPC_MIN_LINK_TOL) ||
 129            (link_tolerance > TIPC_MAX_LINK_TOL)) {
 130                warn("Media <%s> rejected, illegal tolerance (%u)\n", name,
 131                     link_tolerance);
 132                goto exit;
 133        }
 134
 135        media_id = media_count++;
 136        if (media_id >= MAX_MEDIA) {
 137                warn("Media <%s> rejected, media limit reached (%u)\n", name,
 138                     MAX_MEDIA);
 139                media_count--;
 140                goto exit;
 141        }
 142        for (i = 0; i < media_id; i++) {
 143                if (media_list[i].type_id == media_type) {
 144                        warn("Media <%s> rejected, duplicate type (%u)\n", name,
 145                             media_type);
 146                        media_count--;
 147                        goto exit;
 148                }
 149                if (!strcmp(name, media_list[i].name)) {
 150                        warn("Media <%s> rejected, duplicate name\n", name);
 151                        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:
 171        write_unlock_bh(&tipc_net_lock);
 172        return res;
 173}
 174
 175/**
 176 * tipc_media_addr_printf - record media address in print buffer
 177 */
 178
 179void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a)
 180{
 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/**
 207 * tipc_media_get_names - record names of registered media in buffer
 208 */
 209
 210struct sk_buff *tipc_media_get_names(void)
 211{
 212        struct sk_buff *buf;
 213        struct media *m_ptr;
 214        int i;
 215
 216        buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
 217        if (!buf)
 218                return NULL;
 219
 220        read_lock_bh(&tipc_net_lock);
 221        for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
 222                tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, m_ptr->name,
 223                                    strlen(m_ptr->name) + 1);
 224        }
 225        read_unlock_bh(&tipc_net_lock);
 226        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
 289        if (tipc_mode != TIPC_NET_MODE)
 290                return NULL;
 291
 292        for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
 293                if (b_ptr->active && (!strcmp(b_ptr->publ.name, name)))
 294                        return b_ptr;
 295        }
 296        return NULL;
 297}
 298
 299/**
 300 * tipc_bearer_find_interface - locates bearer object with matching interface name
 301 */
 302
 303struct bearer *tipc_bearer_find_interface(const char *if_name)
 304{
 305        struct bearer *b_ptr;
 306        char *b_if_name;
 307        u32 i;
 308
 309        for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
 310                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        }
 316        return NULL;
 317}
 318
 319/**
 320 * tipc_bearer_get_names - record names of bearers in buffer
 321 */
 322
 323struct sk_buff *tipc_bearer_get_names(void)
 324{
 325        struct sk_buff *buf;
 326        struct media *m_ptr;
 327        struct bearer *b_ptr;
 328        int i, j;
 329
 330        buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
 331        if (!buf)
 332                return NULL;
 333
 334        read_lock_bh(&tipc_net_lock);
 335        for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
 336                for (j = 0; j < MAX_BEARERS; j++) {
 337                        b_ptr = &tipc_bearers[j];
 338                        if (b_ptr->active && (b_ptr->media == m_ptr)) {
 339                                tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
 340                                                    b_ptr->publ.name,
 341                                                    strlen(b_ptr->publ.name) + 1);
 342                        }
 343                }
 344        }
 345        read_unlock_bh(&tipc_net_lock);
 346        return buf;
 347}
 348
 349void tipc_bearer_add_dest(struct bearer *b_ptr, u32 dest)
 350{
 351        tipc_nmap_add(&b_ptr->nodes, dest);
 352        tipc_disc_update_link_req(b_ptr->link_req);
 353        tipc_bcbearer_sort();
 354}
 355
 356void tipc_bearer_remove_dest(struct bearer *b_ptr, u32 dest)
 357{
 358        tipc_nmap_remove(&b_ptr->nodes, dest);
 359        tipc_disc_update_link_req(b_ptr->link_req);
 360        tipc_bcbearer_sort();
 361}
 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.
 367 * 'tipc_net_lock' is read_locked when this function is called
 368 * 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 = 0;
 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) {
 381                        res = tipc_link_push_packet(ln);
 382                        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
 391void tipc_bearer_lock_push(struct bearer *b_ptr)
 392{
 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)
 399                tipc_bcbearer_push();
 400}
 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))
 414                tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
 415        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
 423 * the bearer is congested. 'tipc_net_lock' is in read_lock here
 424 * bearer.lock is busy
 425 */
 426
 427static void tipc_bearer_schedule_unlocked(struct bearer *b_ptr, struct link *l_ptr)
 428{
 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
 436 * the bearer is congested. 'tipc_net_lock' is in read_lock here,
 437 * bearer.lock is free
 438 */
 439
 440void tipc_bearer_schedule(struct bearer *b_ptr, struct link *l_ptr)
 441{
 442        spin_lock_bh(&b_ptr->publ.lock);
 443        tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
 444        spin_unlock_bh(&b_ptr->publ.lock);
 445}
 446
 447
 448/*
 449 * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
 450 * and if there is, try to resolve it before returning.
 451 * 'tipc_net_lock' is read_locked when this function is called
 452 */
 453int tipc_bearer_resolve_congestion(struct bearer *b_ptr, struct link *l_ptr)
 454{
 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)) {
 461                tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
 462                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
 484        if (tipc_mode != TIPC_NET_MODE) {
 485                warn("Bearer <%s> rejected, not supported in standalone mode\n",
 486                     name);
 487                return -ENOPROTOOPT;
 488        }
 489        if (!bearer_name_validate(name, &b_name)) {
 490                warn("Bearer <%s> rejected, illegal name\n", name);
 491                return -EINVAL;
 492        }
 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        }
 498        if ((priority < TIPC_MIN_LINK_PRI ||
 499             priority > TIPC_MAX_LINK_PRI) &&
 500            (priority != TIPC_MEDIA_LINK_PRI)) {
 501                warn("Bearer <%s> rejected, illegal priority\n", name);
 502                return -EINVAL;
 503        }
 504
 505        write_lock_bh(&tipc_net_lock);
 506
 507        m_ptr = media_find(b_name.media_name);
 508        if (!m_ptr) {
 509                warn("Bearer <%s> rejected, media <%s> not registered\n", name,
 510                     b_name.media_name);
 511                goto failed;
 512        }
 513
 514        if (priority == TIPC_MEDIA_LINK_PRI)
 515                priority = m_ptr->priority;
 516
 517restart:
 518        bearer_id = MAX_BEARERS;
 519        with_this_prio = 1;
 520        for (i = MAX_BEARERS; i-- != 0; ) {
 521                if (!tipc_bearers[i].active) {
 522                        bearer_id = i;
 523                        continue;
 524                }
 525                if (!strcmp(name, tipc_bearers[i].publ.name)) {
 526                        warn("Bearer <%s> rejected, already enabled\n", name);
 527                        goto failed;
 528                }
 529                if ((tipc_bearers[i].priority == priority) &&
 530                    (++with_this_prio > 2)) {
 531                        if (priority-- == 0) {
 532                                warn("Bearer <%s> rejected, duplicate priority\n",
 533                                     name);
 534                                goto failed;
 535                        }
 536                        warn("Bearer <%s> priority adjustment required %u->%u\n",
 537                             name, priority + 1, priority);
 538                        goto restart;
 539                }
 540        }
 541        if (bearer_id >= MAX_BEARERS) {
 542                warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 543                     name, MAX_BEARERS);
 544                goto failed;
 545        }
 546
 547        b_ptr = &tipc_bearers[bearer_id];
 548        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) {
 553                warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res);
 554                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) {
 566                b_ptr->link_req = tipc_disc_init_link_req(b_ptr, &m_ptr->bcast_addr,
 567                                                          bcast_scope, 2);
 568        }
 569        spin_lock_init(&b_ptr->publ.lock);
 570        write_unlock_bh(&tipc_net_lock);
 571        info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 572             name, addr_string_fill(addr_string, bcast_scope), priority);
 573        return 0;
 574failed:
 575        write_unlock_bh(&tipc_net_lock);
 576        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{
 586        struct bearer *b_ptr = NULL;
 587        struct link *l_ptr;
 588        struct link *temp_l_ptr;
 589
 590        read_lock_bh(&tipc_net_lock);
 591        b_ptr = bearer_find(name);
 592        if (!b_ptr) {
 593                warn("Attempt to block unknown bearer <%s>\n", name);
 594                read_unlock_bh(&tipc_net_lock);
 595                return -EINVAL;
 596        }
 597
 598        info("Blocking bearer <%s>\n", name);
 599        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 tipc_node *n_ptr = l_ptr->owner;
 603
 604                spin_lock_bh(&n_ptr->lock);
 605                tipc_link_reset(l_ptr);
 606                spin_unlock_bh(&n_ptr->lock);
 607        }
 608        spin_unlock_bh(&b_ptr->publ.lock);
 609        read_unlock_bh(&tipc_net_lock);
 610        return 0;
 611}
 612
 613/**
 614 * bearer_disable -
 615 *
 616 * Note: This routine assumes caller holds tipc_net_lock.
 617 */
 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
 625        b_ptr = bearer_find(name);
 626        if (!b_ptr) {
 627                warn("Attempt to disable unknown bearer <%s>\n", name);
 628                return -EINVAL;
 629        }
 630
 631        info("Disabling bearer <%s>\n", name);
 632        tipc_disc_stop_link_req(b_ptr->link_req);
 633        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);
 638                write_unlock_bh(&tipc_net_lock);
 639                b_ptr->media->disable_bearer(&b_ptr->publ);
 640                write_lock_bh(&tipc_net_lock);
 641                spin_lock_bh(&b_ptr->publ.lock);
 642        }
 643        list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
 644                tipc_link_delete(l_ptr);
 645        }
 646        spin_unlock_bh(&b_ptr->publ.lock);
 647        memset(b_ptr, 0, sizeof(struct bearer));
 648        return 0;
 649}
 650
 651int tipc_disable_bearer(const char *name)
 652{
 653        int res;
 654
 655        write_lock_bh(&tipc_net_lock);
 656        res = bearer_disable(name);
 657        write_unlock_bh(&tipc_net_lock);
 658        return res;
 659}
 660
 661
 662
 663int tipc_bearer_init(void)
 664{
 665        int res;
 666
 667        write_lock_bh(&tipc_net_lock);
 668        tipc_bearers = kcalloc(MAX_BEARERS, sizeof(struct bearer), GFP_ATOMIC);
 669        media_list = kcalloc(MAX_MEDIA, sizeof(struct media), GFP_ATOMIC);
 670        if (tipc_bearers && media_list) {
 671                res = 0;
 672        } else {
 673                kfree(tipc_bearers);
 674                kfree(media_list);
 675                tipc_bearers = NULL;
 676                media_list = NULL;
 677                res = -ENOMEM;
 678        }
 679        write_unlock_bh(&tipc_net_lock);
 680        return res;
 681}
 682
 683void tipc_bearer_stop(void)
 684{
 685        u32 i;
 686
 687        if (!tipc_bearers)
 688                return;
 689
 690        for (i = 0; i < MAX_BEARERS; i++) {
 691                if (tipc_bearers[i].active)
 692                        tipc_bearers[i].publ.blocked = 1;
 693        }
 694        for (i = 0; i < MAX_BEARERS; i++) {
 695                if (tipc_bearers[i].active)
 696                        bearer_disable(tipc_bearers[i].publ.name);
 697        }
 698        kfree(tipc_bearers);
 699        kfree(media_list);
 700        tipc_bearers = NULL;
 701        media_list = NULL;
 702        media_count = 0;
 703}
 704
 705
 706