net/tipc/bearer.c

   1 /*
   2  * net/tipc/bearer.c: TIPC bearer code
   3  *
   4  * Copyright (c) 1996-2006, 2013, Ericsson AB
   5  * Copyright (c) 2004-2006, 2010-2013, 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 "bearer.h"
  40 #include "discover.h"
  41
  42 #define MAX_ADDR_STR 60
  43
  44 static struct tipc_media * const media_info_array[] = {
  45         &eth_media_info,
  46 #ifdef CONFIG_TIPC_MEDIA_IB
  47         &ib_media_info,
  48 #endif
  49         NULL
  50 };
  51
  52 struct tipc_bearer *bearer_list[MAX_BEARERS + 1];
  53
  54 static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down);
  55
  56 /**
  57  * tipc_media_find - locates specified media object by name
  58  */
  59 struct tipc_media *tipc_media_find(const char *name)
  60 {
  61         u32 i;
  62
  63         for (i = 0; media_info_array[i] != NULL; i++) {
  64                 if (!strcmp(media_info_array[i]->name, name))
  65                         break;
  66         }
  67         return media_info_array[i];
  68 }
  69
  70 /**
  71  * media_find_id - locates specified media object by type identifier
  72  */
  73 static struct tipc_media *media_find_id(u8 type)
  74 {
  75         u32 i;
  76
  77         for (i = 0; media_info_array[i] != NULL; i++) {
  78                 if (media_info_array[i]->type_id == type)
  79                         break;
  80         }
  81         return media_info_array[i];
  82 }
  83
  84 /**
  85  * tipc_media_addr_printf - record media address in print buffer
  86  */
  87 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
  88 {
  89         char addr_str[MAX_ADDR_STR];
  90         struct tipc_media *m_ptr;
  91         int ret;
  92
  93         m_ptr = media_find_id(a->media_id);
  94
  95         if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
  96                 ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
  97         else {
  98                 u32 i;
  99
 100                 ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id);
 101                 for (i = 0; i < sizeof(a->value); i++)
 102                         ret += tipc_snprintf(buf - ret, len + ret,
 103                                             "-%02x", a->value[i]);
 104         }
 105 }
 106
 107 /**
 108  * tipc_media_get_names - record names of registered media in buffer
 109  */
 110 struct sk_buff *tipc_media_get_names(void)
 111 {
 112         struct sk_buff *buf;
 113         int i;
 114
 115         buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
 116         if (!buf)
 117                 return NULL;
 118
 119         for (i = 0; media_info_array[i] != NULL; i++) {
 120                 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
 121                                     media_info_array[i]->name,
 122                                     strlen(media_info_array[i]->name) + 1);
 123         }
 124         return buf;
 125 }
 126
 127 /**
 128  * bearer_name_validate - validate & (optionally) deconstruct bearer name
 129  * @name: ptr to bearer name string
 130  * @name_parts: ptr to area for bearer name components (or NULL if not needed)
 131  *
 132  * Returns 1 if bearer name is valid, otherwise 0.
 133  */
 134 static int bearer_name_validate(const char *name,
 135                                 struct tipc_bearer_names *name_parts)
 136 {
 137         char name_copy[TIPC_MAX_BEARER_NAME];
 138         char *media_name;
 139         char *if_name;
 140         u32 media_len;
 141         u32 if_len;
 142
 143         /* copy bearer name & ensure length is OK */
 144         name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 145         /* need above in case non-Posix strncpy() doesn't pad with nulls */
 146         strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 147         if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 148                 return 0;
 149
 150         /* ensure all component parts of bearer name are present */
 151         media_name = name_copy;
 152         if_name = strchr(media_name, ':');
 153         if (if_name == NULL)
 154                 return 0;
 155         *(if_name++) = 0;
 156         media_len = if_name - media_name;
 157         if_len = strlen(if_name) + 1;
 158
 159         /* validate component parts of bearer name */
 160         if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 161             (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
 162                 return 0;
 163
 164         /* return bearer name components, if necessary */
 165         if (name_parts) {
 166                 strcpy(name_parts->media_name, media_name);
 167                 strcpy(name_parts->if_name, if_name);
 168         }
 169         return 1;
 170 }
 171
 172 /**
 173  * tipc_bearer_find - locates bearer object with matching bearer name
 174  */
 175 struct tipc_bearer *tipc_bearer_find(const char *name)
 176 {
 177         struct tipc_bearer *b_ptr;
 178         u32 i;
 179
 180         for (i = 0; i < MAX_BEARERS; i++) {
 181                 b_ptr = bearer_list[i];
 182                 if (b_ptr && (!strcmp(b_ptr->name, name)))
 183                         return b_ptr;
 184         }
 185         return NULL;
 186 }
 187
 188 /**
 189  * tipc_bearer_get_names - record names of bearers in buffer
 190  */
 191 struct sk_buff *tipc_bearer_get_names(void)
 192 {
 193         struct sk_buff *buf;
 194         struct tipc_bearer *b;
 195         int i, j;
 196
 197         buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
 198         if (!buf)
 199                 return NULL;
 200
 201         read_lock_bh(&tipc_net_lock);
 202         for (i = 0; media_info_array[i] != NULL; i++) {
 203                 for (j = 0; j < MAX_BEARERS; j++) {
 204                         b = bearer_list[j];
 205                         if (!b)
 206                                 continue;
 207                         if (b->media == media_info_array[i]) {
 208                                 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
 209                                                     b->name,
 210                                                     strlen(b->name) + 1);
 211                         }
 212                 }
 213         }
 214         read_unlock_bh(&tipc_net_lock);
 215         return buf;
 216 }
 217
 218 void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest)
 219 {
 220         tipc_nmap_add(&b_ptr->nodes, dest);
 221         tipc_bcbearer_sort();
 222         tipc_disc_add_dest(b_ptr->link_req);
 223 }
 224
 225 void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest)
 226 {
 227         tipc_nmap_remove(&b_ptr->nodes, dest);
 228         tipc_bcbearer_sort();
 229         tipc_disc_remove_dest(b_ptr->link_req);
 230 }
 231
 232 /**
 233  * tipc_enable_bearer - enable bearer with the given name
 234  */
 235 int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
 236 {
 237         struct tipc_bearer *b_ptr;
 238         struct tipc_media *m_ptr;
 239         struct tipc_bearer_names b_names;
 240         char addr_string[16];
 241         u32 bearer_id;
 242         u32 with_this_prio;
 243         u32 i;
 244         int res = -EINVAL;
 245
 246         if (!tipc_own_addr) {
 247                 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
 248                         name);
 249                 return -ENOPROTOOPT;
 250         }
 251         if (!bearer_name_validate(name, &b_names)) {
 252                 pr_warn("Bearer <%s> rejected, illegal name\n", name);
 253                 return -EINVAL;
 254         }
 255         if (tipc_addr_domain_valid(disc_domain) &&
 256             (disc_domain != tipc_own_addr)) {
 257                 if (tipc_in_scope(disc_domain, tipc_own_addr)) {
 258                         disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
 259                         res = 0;   /* accept any node in own cluster */
 260                 } else if (in_own_cluster_exact(disc_domain))
 261                         res = 0;   /* accept specified node in own cluster */
 262         }
 263         if (res) {
 264                 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
 265                         name);
 266                 return -EINVAL;
 267         }
 268         if ((priority > TIPC_MAX_LINK_PRI) &&
 269             (priority != TIPC_MEDIA_LINK_PRI)) {
 270                 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
 271                 return -EINVAL;
 272         }
 273
 274         write_lock_bh(&tipc_net_lock);
 275
 276         m_ptr = tipc_media_find(b_names.media_name);
 277         if (!m_ptr) {
 278                 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
 279                         name, b_names.media_name);
 280                 goto exit;
 281         }
 282
 283         if (priority == TIPC_MEDIA_LINK_PRI)
 284                 priority = m_ptr->priority;
 285
 286 restart:
 287         bearer_id = MAX_BEARERS;
 288         with_this_prio = 1;
 289         for (i = MAX_BEARERS; i-- != 0; ) {
 290                 b_ptr = bearer_list[i];
 291                 if (!b_ptr) {
 292                         bearer_id = i;
 293                         continue;
 294                 }
 295                 if (!strcmp(name, b_ptr->name)) {
 296                         pr_warn("Bearer <%s> rejected, already enabled\n",
 297                                 name);
 298                         goto exit;
 299                 }
 300                 if ((b_ptr->priority == priority) &&
 301                     (++with_this_prio > 2)) {
 302                         if (priority-- == 0) {
 303                                 pr_warn("Bearer <%s> rejected, duplicate priority\n",
 304                                         name);
 305                                 goto exit;
 306                         }
 307                         pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
 308                                 name, priority + 1, priority);
 309                         goto restart;
 310                 }
 311         }
 312         if (bearer_id >= MAX_BEARERS) {
 313                 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 314                         name, MAX_BEARERS);
 315                 goto exit;
 316         }
 317
 318         b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
 319         if (!b_ptr) {
 320                 res = -ENOMEM;
 321                 goto exit;
 322         }
 323         strcpy(b_ptr->name, name);
 324         b_ptr->media = m_ptr;
 325         res = m_ptr->enable_media(b_ptr);
 326         if (res) {
 327                 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
 328                         name, -res);
 329                 goto exit;
 330         }
 331
 332         b_ptr->identity = bearer_id;
 333         b_ptr->tolerance = m_ptr->tolerance;
 334         b_ptr->window = m_ptr->window;
 335         b_ptr->domain = disc_domain;
 336         b_ptr->net_plane = bearer_id + 'A';
 337         b_ptr->priority = priority;
 338
 339         res = tipc_disc_create(b_ptr, &b_ptr->bcast_addr);
 340         if (res) {
 341                 bearer_disable(b_ptr, false);
 342                 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
 343                         name);
 344                 goto exit;
 345         }
 346
 347         bearer_list[bearer_id] = b_ptr;
 348
 349         pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 350                 name,
 351                 tipc_addr_string_fill(addr_string, disc_domain), priority);
 352 exit:
 353         write_unlock_bh(&tipc_net_lock);
 354         return res;
 355 }
 356
 357 /**
 358  * tipc_reset_bearer - Reset all links established over this bearer
 359  */
 360 static int tipc_reset_bearer(struct tipc_bearer *b_ptr)
 361 {
 362         read_lock_bh(&tipc_net_lock);
 363         pr_info("Resetting bearer <%s>\n", b_ptr->name);
 364         tipc_disc_delete(b_ptr->link_req);
 365         tipc_link_reset_list(b_ptr->identity);
 366         tipc_disc_create(b_ptr, &b_ptr->bcast_addr);
 367         read_unlock_bh(&tipc_net_lock);
 368         return 0;
 369 }
 370
 371 /**
 372  * bearer_disable
 373  *
 374  * Note: This routine assumes caller holds tipc_net_lock.
 375  */
 376 static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down)
 377 {
 378         u32 i;
 379
 380         pr_info("Disabling bearer <%s>\n", b_ptr->name);
 381         b_ptr->media->disable_media(b_ptr);
 382
 383         tipc_link_delete_list(b_ptr->identity, shutting_down);
 384         if (b_ptr->link_req)
 385                 tipc_disc_delete(b_ptr->link_req);
 386
 387         for (i = 0; i < MAX_BEARERS; i++) {
 388                 if (b_ptr == bearer_list[i]) {
 389                         bearer_list[i] = NULL;
 390                         break;
 391                 }
 392         }
 393         kfree(b_ptr);
 394 }
 395
 396 int tipc_disable_bearer(const char *name)
 397 {
 398         struct tipc_bearer *b_ptr;
 399         int res;
 400
 401         write_lock_bh(&tipc_net_lock);
 402         b_ptr = tipc_bearer_find(name);
 403         if (b_ptr == NULL) {
 404                 pr_warn("Attempt to disable unknown bearer <%s>\n", name);
 405                 res = -EINVAL;
 406         } else {
 407                 bearer_disable(b_ptr, false);
 408                 res = 0;
 409         }
 410         write_unlock_bh(&tipc_net_lock);
 411         return res;
 412 }
 413
 414
 415 /* tipc_l2_media_addr_set - initialize Ethernet media address structure
 416  *
 417  * Media-dependent "value" field stores MAC address in first 6 bytes
 418  * and zeroes out the remaining bytes.
 419  */
 420 void tipc_l2_media_addr_set(const struct tipc_bearer *b,
 421                             struct tipc_media_addr *a, char *mac)
 422 {
 423         int len = b->media->hwaddr_len;
 424
 425         if (unlikely(sizeof(a->value) < len)) {
 426                 WARN_ONCE(1, "Media length invalid\n");
 427                 return;
 428         }
 429
 430         memcpy(a->value, mac, len);
 431         memset(a->value + len, 0, sizeof(a->value) - len);
 432         a->media_id = b->media->type_id;
 433         a->broadcast = !memcmp(mac, b->bcast_addr.value, len);
 434 }
 435
 436 int tipc_enable_l2_media(struct tipc_bearer *b)
 437 {
 438         struct net_device *dev;
 439         char *driver_name = strchr((const char *)b->name, ':') + 1;
 440
 441         /* Find device with specified name */
 442         dev = dev_get_by_name(&init_net, driver_name);
 443         if (!dev)
 444                 return -ENODEV;
 445
 446         /* Associate TIPC bearer with Ethernet bearer */
 447         b->media_ptr = dev;
 448         memset(b->bcast_addr.value, 0, sizeof(b->bcast_addr.value));
 449         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 450         b->bcast_addr.media_id = b->media->type_id;
 451         b->bcast_addr.broadcast = 1;
 452         b->mtu = dev->mtu;
 453         tipc_l2_media_addr_set(b, &b->addr, (char *)dev->dev_addr);
 454         rcu_assign_pointer(dev->tipc_ptr, b);
 455         return 0;
 456 }
 457
 458 /* tipc_disable_l2_media - detach TIPC bearer from an Ethernet interface
 459  *
 460  * Mark Ethernet bearer as inactive so that incoming buffers are thrown away,
 461  * then get worker thread to complete bearer cleanup.  (Can't do cleanup
 462  * here because cleanup code needs to sleep and caller holds spinlocks.)
 463  */
 464 void tipc_disable_l2_media(struct tipc_bearer *b)
 465 {
 466         struct net_device *dev = (struct net_device *)b->media_ptr;
 467         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 468         dev_put(dev);
 469 }
 470
 471 /**
 472  * tipc_l2_send_msg - send a TIPC packet out over an Ethernet interface
 473  * @buf: the packet to be sent
 474  * @b_ptr: the bearer through which the packet is to be sent
 475  * @dest: peer destination address
 476  */
 477 int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b,
 478                      struct tipc_media_addr *dest)
 479 {
 480         struct sk_buff *clone;
 481         int delta;
 482         struct net_device *dev = (struct net_device *)b->media_ptr;
 483
 484         clone = skb_clone(buf, GFP_ATOMIC);
 485         if (!clone)
 486                 return 0;
 487
 488         delta = dev->hard_header_len - skb_headroom(buf);
 489         if ((delta > 0) &&
 490             pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
 491                 kfree_skb(clone);
 492                 return 0;
 493         }
 494
 495         skb_reset_network_header(clone);
 496         clone->dev = dev;
 497         clone->protocol = htons(ETH_P_TIPC);
 498         dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
 499                         dev->dev_addr, clone->len);
 500         dev_queue_xmit(clone);
 501         return 0;
 502 }
 503
 504 /* tipc_bearer_send- sends buffer to destination over bearer
 505  *
 506  * IMPORTANT:
 507  * The media send routine must not alter the buffer being passed in
 508  * as it may be needed for later retransmission!
 509  */
 510 void tipc_bearer_send(struct tipc_bearer *b, struct sk_buff *buf,
 511                       struct tipc_media_addr *dest)
 512 {
 513         b->media->send_msg(buf, b, dest);
 514 }
 515
 516 /**
 517  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 518  * @buf: the received packet
 519  * @dev: the net device that the packet was received on
 520  * @pt: the packet_type structure which was used to register this handler
 521  * @orig_dev: the original receive net device in case the device is a bond
 522  *
 523  * Accept only packets explicitly sent to this node, or broadcast packets;
 524  * ignores packets sent using interface multicast, and traffic sent to other
 525  * nodes (which can happen if interface is running in promiscuous mode).
 526  */
 527 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
 528                            struct packet_type *pt, struct net_device *orig_dev)
 529 {
 530         struct tipc_bearer *b_ptr;
 531
 532         if (!net_eq(dev_net(dev), &init_net)) {
 533                 kfree_skb(buf);
 534                 return NET_RX_DROP;
 535         }
 536
 537         rcu_read_lock();
 538         b_ptr = rcu_dereference(dev->tipc_ptr);
 539         if (likely(b_ptr)) {
 540                 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
 541                         buf->next = NULL;
 542                         tipc_rcv(buf, b_ptr);
 543                         rcu_read_unlock();
 544                         return NET_RX_SUCCESS;
 545                 }
 546         }
 547         rcu_read_unlock();
 548
 549         kfree_skb(buf);
 550         return NET_RX_DROP;
 551 }
 552
 553 /**
 554  * tipc_l2_device_event - handle device events from network device
 555  * @nb: the context of the notification
 556  * @evt: the type of event
 557  * @ptr: the net device that the event was on
 558  *
 559  * This function is called by the Ethernet driver in case of link
 560  * change event.
 561  */
 562 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 563                                 void *ptr)
 564 {
 565         struct tipc_bearer *b_ptr;
 566         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 567
 568         if (!net_eq(dev_net(dev), &init_net))
 569                 return NOTIFY_DONE;
 570
 571         rcu_read_lock();
 572         b_ptr = rcu_dereference(dev->tipc_ptr);
 573         if (!b_ptr) {
 574                 rcu_read_unlock();
 575                 return NOTIFY_DONE;
 576         }
 577
 578         b_ptr->mtu = dev->mtu;
 579
 580         switch (evt) {
 581         case NETDEV_CHANGE:
 582                 if (netif_carrier_ok(dev))
 583                         break;
 584         case NETDEV_DOWN:
 585         case NETDEV_CHANGEMTU:
 586                 tipc_reset_bearer(b_ptr);
 587                 break;
 588         case NETDEV_CHANGEADDR:
 589                 tipc_l2_media_addr_set(b_ptr, &b_ptr->addr,
 590                                        (char *)dev->dev_addr);
 591                 tipc_reset_bearer(b_ptr);
 592                 break;
 593         case NETDEV_UNREGISTER:
 594         case NETDEV_CHANGENAME:
 595                 tipc_disable_bearer(b_ptr->name);
 596                 break;
 597         }
 598         rcu_read_unlock();
 599
 600         return NOTIFY_OK;
 601 }
 602
 603 static struct packet_type tipc_packet_type __read_mostly = {
 604         .type = htons(ETH_P_TIPC),
 605         .func = tipc_l2_rcv_msg,
 606 };
 607
 608 static struct notifier_block notifier = {
 609         .notifier_call  = tipc_l2_device_event,
 610         .priority       = 0,
 611 };
 612
 613 int tipc_bearer_setup(void)
 614 {
 615         int err;
 616
 617         err = register_netdevice_notifier(&notifier);
 618         if (err)
 619                 return err;
 620         dev_add_pack(&tipc_packet_type);
 621         return 0;
 622 }
 623
 624 void tipc_bearer_cleanup(void)
 625 {
 626         unregister_netdevice_notifier(&notifier);
 627         dev_remove_pack(&tipc_packet_type);
 628 }
 629
 630 void tipc_bearer_stop(void)
 631 {
 632         struct tipc_bearer *b_ptr;
 633         u32 i;
 634
 635         for (i = 0; i < MAX_BEARERS; i++) {
 636                 b_ptr = bearer_list[i];
 637                 if (b_ptr) {
 638                         bearer_disable(b_ptr, true);
 639                         bearer_list[i] = NULL;
 640                 }
 641         }
 642 }