net/tipc/bearer.c

   1 /*
   2  * net/tipc/bearer.c: TIPC bearer code
   3  *
   4  * Copyright (c) 1996-2006, 2013-2014, 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 "link.h"
  41 #include "discover.h"
  42
  43 #define MAX_ADDR_STR 60
  44
  45 static struct tipc_media * const media_info_array[] = {
  46         &eth_media_info,
  47 #ifdef CONFIG_TIPC_MEDIA_IB
  48         &ib_media_info,
  49 #endif
  50         NULL
  51 };
  52
  53 static const struct nla_policy
  54 tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1]  = {
  55         [TIPC_NLA_BEARER_UNSPEC]                = { .type = NLA_UNSPEC },
  56         [TIPC_NLA_BEARER_NAME] = {
  57                 .type = NLA_STRING,
  58                 .len = TIPC_MAX_BEARER_NAME
  59         },
  60         [TIPC_NLA_BEARER_PROP]                  = { .type = NLA_NESTED },
  61         [TIPC_NLA_BEARER_DOMAIN]                = { .type = NLA_U32 }
  62 };
  63
  64 static const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
  65         [TIPC_NLA_MEDIA_UNSPEC]         = { .type = NLA_UNSPEC },
  66         [TIPC_NLA_MEDIA_NAME]           = { .type = NLA_STRING },
  67         [TIPC_NLA_MEDIA_PROP]           = { .type = NLA_NESTED }
  68 };
  69
  70 struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1];
  71
  72 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
  73                            bool shutting_down);
  74
  75 /**
  76  * tipc_media_find - locates specified media object by name
  77  */
  78 struct tipc_media *tipc_media_find(const char *name)
  79 {
  80         u32 i;
  81
  82         for (i = 0; media_info_array[i] != NULL; i++) {
  83                 if (!strcmp(media_info_array[i]->name, name))
  84                         break;
  85         }
  86         return media_info_array[i];
  87 }
  88
  89 /**
  90  * media_find_id - locates specified media object by type identifier
  91  */
  92 static struct tipc_media *media_find_id(u8 type)
  93 {
  94         u32 i;
  95
  96         for (i = 0; media_info_array[i] != NULL; i++) {
  97                 if (media_info_array[i]->type_id == type)
  98                         break;
  99         }
 100         return media_info_array[i];
 101 }
 102
 103 /**
 104  * tipc_media_addr_printf - record media address in print buffer
 105  */
 106 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
 107 {
 108         char addr_str[MAX_ADDR_STR];
 109         struct tipc_media *m_ptr;
 110         int ret;
 111
 112         m_ptr = media_find_id(a->media_id);
 113
 114         if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
 115                 ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
 116         else {
 117                 u32 i;
 118
 119                 ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id);
 120                 for (i = 0; i < sizeof(a->value); i++)
 121                         ret += tipc_snprintf(buf - ret, len + ret,
 122                                             "-%02x", a->value[i]);
 123         }
 124 }
 125
 126 /**
 127  * tipc_media_get_names - record names of registered media in buffer
 128  */
 129 struct sk_buff *tipc_media_get_names(void)
 130 {
 131         struct sk_buff *buf;
 132         int i;
 133
 134         buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
 135         if (!buf)
 136                 return NULL;
 137
 138         for (i = 0; media_info_array[i] != NULL; i++) {
 139                 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
 140                                     media_info_array[i]->name,
 141                                     strlen(media_info_array[i]->name) + 1);
 142         }
 143         return buf;
 144 }
 145
 146 /**
 147  * bearer_name_validate - validate & (optionally) deconstruct bearer name
 148  * @name: ptr to bearer name string
 149  * @name_parts: ptr to area for bearer name components (or NULL if not needed)
 150  *
 151  * Returns 1 if bearer name is valid, otherwise 0.
 152  */
 153 static int bearer_name_validate(const char *name,
 154                                 struct tipc_bearer_names *name_parts)
 155 {
 156         char name_copy[TIPC_MAX_BEARER_NAME];
 157         char *media_name;
 158         char *if_name;
 159         u32 media_len;
 160         u32 if_len;
 161
 162         /* copy bearer name & ensure length is OK */
 163         name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 164         /* need above in case non-Posix strncpy() doesn't pad with nulls */
 165         strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 166         if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 167                 return 0;
 168
 169         /* ensure all component parts of bearer name are present */
 170         media_name = name_copy;
 171         if_name = strchr(media_name, ':');
 172         if (if_name == NULL)
 173                 return 0;
 174         *(if_name++) = 0;
 175         media_len = if_name - media_name;
 176         if_len = strlen(if_name) + 1;
 177
 178         /* validate component parts of bearer name */
 179         if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 180             (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
 181                 return 0;
 182
 183         /* return bearer name components, if necessary */
 184         if (name_parts) {
 185                 strcpy(name_parts->media_name, media_name);
 186                 strcpy(name_parts->if_name, if_name);
 187         }
 188         return 1;
 189 }
 190
 191 /**
 192  * tipc_bearer_find - locates bearer object with matching bearer name
 193  */
 194 struct tipc_bearer *tipc_bearer_find(const char *name)
 195 {
 196         struct tipc_bearer *b_ptr;
 197         u32 i;
 198
 199         for (i = 0; i < MAX_BEARERS; i++) {
 200                 b_ptr = rtnl_dereference(bearer_list[i]);
 201                 if (b_ptr && (!strcmp(b_ptr->name, name)))
 202                         return b_ptr;
 203         }
 204         return NULL;
 205 }
 206
 207 /**
 208  * tipc_bearer_get_names - record names of bearers in buffer
 209  */
 210 struct sk_buff *tipc_bearer_get_names(void)
 211 {
 212         struct sk_buff *buf;
 213         struct tipc_bearer *b;
 214         int i, j;
 215
 216         buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
 217         if (!buf)
 218                 return NULL;
 219
 220         for (i = 0; media_info_array[i] != NULL; i++) {
 221                 for (j = 0; j < MAX_BEARERS; j++) {
 222                         b = rtnl_dereference(bearer_list[j]);
 223                         if (!b)
 224                                 continue;
 225                         if (b->media == media_info_array[i]) {
 226                                 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
 227                                                     b->name,
 228                                                     strlen(b->name) + 1);
 229                         }
 230                 }
 231         }
 232         return buf;
 233 }
 234
 235 void tipc_bearer_add_dest(u32 bearer_id, u32 dest)
 236 {
 237         struct tipc_bearer *b_ptr;
 238
 239         rcu_read_lock();
 240         b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]);
 241         if (b_ptr) {
 242                 tipc_bcbearer_sort(&b_ptr->nodes, dest, true);
 243                 tipc_disc_add_dest(b_ptr->link_req);
 244         }
 245         rcu_read_unlock();
 246 }
 247
 248 void tipc_bearer_remove_dest(u32 bearer_id, u32 dest)
 249 {
 250         struct tipc_bearer *b_ptr;
 251
 252         rcu_read_lock();
 253         b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]);
 254         if (b_ptr) {
 255                 tipc_bcbearer_sort(&b_ptr->nodes, dest, false);
 256                 tipc_disc_remove_dest(b_ptr->link_req);
 257         }
 258         rcu_read_unlock();
 259 }
 260
 261 /**
 262  * tipc_enable_bearer - enable bearer with the given name
 263  */
 264 int tipc_enable_bearer(struct net *net, const char *name, u32 disc_domain,
 265                        u32 priority)
 266 {
 267         struct tipc_bearer *b_ptr;
 268         struct tipc_media *m_ptr;
 269         struct tipc_bearer_names b_names;
 270         char addr_string[16];
 271         u32 bearer_id;
 272         u32 with_this_prio;
 273         u32 i;
 274         int res = -EINVAL;
 275
 276         if (!tipc_own_addr) {
 277                 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
 278                         name);
 279                 return -ENOPROTOOPT;
 280         }
 281         if (!bearer_name_validate(name, &b_names)) {
 282                 pr_warn("Bearer <%s> rejected, illegal name\n", name);
 283                 return -EINVAL;
 284         }
 285         if (tipc_addr_domain_valid(disc_domain) &&
 286             (disc_domain != tipc_own_addr)) {
 287                 if (tipc_in_scope(disc_domain, tipc_own_addr)) {
 288                         disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
 289                         res = 0;   /* accept any node in own cluster */
 290                 } else if (in_own_cluster_exact(disc_domain))
 291                         res = 0;   /* accept specified node in own cluster */
 292         }
 293         if (res) {
 294                 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
 295                         name);
 296                 return -EINVAL;
 297         }
 298         if ((priority > TIPC_MAX_LINK_PRI) &&
 299             (priority != TIPC_MEDIA_LINK_PRI)) {
 300                 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
 301                 return -EINVAL;
 302         }
 303
 304         m_ptr = tipc_media_find(b_names.media_name);
 305         if (!m_ptr) {
 306                 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
 307                         name, b_names.media_name);
 308                 return -EINVAL;
 309         }
 310
 311         if (priority == TIPC_MEDIA_LINK_PRI)
 312                 priority = m_ptr->priority;
 313
 314 restart:
 315         bearer_id = MAX_BEARERS;
 316         with_this_prio = 1;
 317         for (i = MAX_BEARERS; i-- != 0; ) {
 318                 b_ptr = rtnl_dereference(bearer_list[i]);
 319                 if (!b_ptr) {
 320                         bearer_id = i;
 321                         continue;
 322                 }
 323                 if (!strcmp(name, b_ptr->name)) {
 324                         pr_warn("Bearer <%s> rejected, already enabled\n",
 325                                 name);
 326                         return -EINVAL;
 327                 }
 328                 if ((b_ptr->priority == priority) &&
 329                     (++with_this_prio > 2)) {
 330                         if (priority-- == 0) {
 331                                 pr_warn("Bearer <%s> rejected, duplicate priority\n",
 332                                         name);
 333                                 return -EINVAL;
 334                         }
 335                         pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
 336                                 name, priority + 1, priority);
 337                         goto restart;
 338                 }
 339         }
 340         if (bearer_id >= MAX_BEARERS) {
 341                 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 342                         name, MAX_BEARERS);
 343                 return -EINVAL;
 344         }
 345
 346         b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
 347         if (!b_ptr)
 348                 return -ENOMEM;
 349
 350         strcpy(b_ptr->name, name);
 351         b_ptr->media = m_ptr;
 352         res = m_ptr->enable_media(b_ptr);
 353         if (res) {
 354                 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
 355                         name, -res);
 356                 return -EINVAL;
 357         }
 358
 359         b_ptr->identity = bearer_id;
 360         b_ptr->tolerance = m_ptr->tolerance;
 361         b_ptr->window = m_ptr->window;
 362         b_ptr->domain = disc_domain;
 363         b_ptr->net_plane = bearer_id + 'A';
 364         b_ptr->priority = priority;
 365
 366         res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr);
 367         if (res) {
 368                 bearer_disable(net, b_ptr, false);
 369                 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
 370                         name);
 371                 return -EINVAL;
 372         }
 373
 374         rcu_assign_pointer(bearer_list[bearer_id], b_ptr);
 375
 376         pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 377                 name,
 378                 tipc_addr_string_fill(addr_string, disc_domain), priority);
 379         return res;
 380 }
 381
 382 /**
 383  * tipc_reset_bearer - Reset all links established over this bearer
 384  */
 385 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr)
 386 {
 387         pr_info("Resetting bearer <%s>\n", b_ptr->name);
 388         tipc_link_reset_list(net, b_ptr->identity);
 389         tipc_disc_reset(net, b_ptr);
 390         return 0;
 391 }
 392
 393 /**
 394  * bearer_disable
 395  *
 396  * Note: This routine assumes caller holds RTNL lock.
 397  */
 398 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
 399                            bool shutting_down)
 400 {
 401         u32 i;
 402
 403         pr_info("Disabling bearer <%s>\n", b_ptr->name);
 404         b_ptr->media->disable_media(b_ptr);
 405
 406         tipc_link_delete_list(net, b_ptr->identity, shutting_down);
 407         if (b_ptr->link_req)
 408                 tipc_disc_delete(b_ptr->link_req);
 409
 410         for (i = 0; i < MAX_BEARERS; i++) {
 411                 if (b_ptr == rtnl_dereference(bearer_list[i])) {
 412                         RCU_INIT_POINTER(bearer_list[i], NULL);
 413                         break;
 414                 }
 415         }
 416         kfree_rcu(b_ptr, rcu);
 417 }
 418
 419 int tipc_disable_bearer(struct net *net, const char *name)
 420 {
 421         struct tipc_bearer *b_ptr;
 422         int res;
 423
 424         b_ptr = tipc_bearer_find(name);
 425         if (b_ptr == NULL) {
 426                 pr_warn("Attempt to disable unknown bearer <%s>\n", name);
 427                 res = -EINVAL;
 428         } else {
 429                 bearer_disable(net, b_ptr, false);
 430                 res = 0;
 431         }
 432         return res;
 433 }
 434
 435 int tipc_enable_l2_media(struct tipc_bearer *b)
 436 {
 437         struct net_device *dev;
 438         char *driver_name = strchr((const char *)b->name, ':') + 1;
 439
 440         /* Find device with specified name */
 441         dev = dev_get_by_name(&init_net, driver_name);
 442         if (!dev)
 443                 return -ENODEV;
 444
 445         /* Associate TIPC bearer with L2 bearer */
 446         rcu_assign_pointer(b->media_ptr, dev);
 447         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 448         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 449         b->bcast_addr.media_id = b->media->type_id;
 450         b->bcast_addr.broadcast = 1;
 451         b->mtu = dev->mtu;
 452         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 453         rcu_assign_pointer(dev->tipc_ptr, b);
 454         return 0;
 455 }
 456
 457 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 458  *
 459  * Mark L2 bearer as inactive so that incoming buffers are thrown away,
 460  * then get worker thread to complete bearer cleanup.  (Can't do cleanup
 461  * here because cleanup code needs to sleep and caller holds spinlocks.)
 462  */
 463 void tipc_disable_l2_media(struct tipc_bearer *b)
 464 {
 465         struct net_device *dev;
 466
 467         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 468         RCU_INIT_POINTER(b->media_ptr, NULL);
 469         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 470         synchronize_net();
 471         dev_put(dev);
 472 }
 473
 474 /**
 475  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 476  * @buf: the packet to be sent
 477  * @b_ptr: the bearer through which the packet is to be sent
 478  * @dest: peer destination address
 479  */
 480 int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b,
 481                      struct tipc_media_addr *dest)
 482 {
 483         struct sk_buff *clone;
 484         struct net_device *dev;
 485         int delta;
 486
 487         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
 488         if (!dev)
 489                 return 0;
 490
 491         clone = skb_clone(buf, GFP_ATOMIC);
 492         if (!clone)
 493                 return 0;
 494
 495         delta = dev->hard_header_len - skb_headroom(buf);
 496         if ((delta > 0) &&
 497             pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
 498                 kfree_skb(clone);
 499                 return 0;
 500         }
 501
 502         skb_reset_network_header(clone);
 503         clone->dev = dev;
 504         clone->protocol = htons(ETH_P_TIPC);
 505         dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
 506                         dev->dev_addr, clone->len);
 507         dev_queue_xmit(clone);
 508         return 0;
 509 }
 510
 511 /* tipc_bearer_send- sends buffer to destination over bearer
 512  *
 513  * IMPORTANT:
 514  * The media send routine must not alter the buffer being passed in
 515  * as it may be needed for later retransmission!
 516  */
 517 void tipc_bearer_send(u32 bearer_id, struct sk_buff *buf,
 518                       struct tipc_media_addr *dest)
 519 {
 520         struct tipc_bearer *b_ptr;
 521
 522         rcu_read_lock();
 523         b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]);
 524         if (likely(b_ptr))
 525                 b_ptr->media->send_msg(buf, b_ptr, dest);
 526         rcu_read_unlock();
 527 }
 528
 529 /**
 530  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 531  * @buf: the received packet
 532  * @dev: the net device that the packet was received on
 533  * @pt: the packet_type structure which was used to register this handler
 534  * @orig_dev: the original receive net device in case the device is a bond
 535  *
 536  * Accept only packets explicitly sent to this node, or broadcast packets;
 537  * ignores packets sent using interface multicast, and traffic sent to other
 538  * nodes (which can happen if interface is running in promiscuous mode).
 539  */
 540 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
 541                            struct packet_type *pt, struct net_device *orig_dev)
 542 {
 543         struct tipc_bearer *b_ptr;
 544
 545         rcu_read_lock();
 546         b_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
 547         if (likely(b_ptr)) {
 548                 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
 549                         buf->next = NULL;
 550                         tipc_rcv(dev_net(dev), buf, b_ptr);
 551                         rcu_read_unlock();
 552                         return NET_RX_SUCCESS;
 553                 }
 554         }
 555         rcu_read_unlock();
 556
 557         kfree_skb(buf);
 558         return NET_RX_DROP;
 559 }
 560
 561 /**
 562  * tipc_l2_device_event - handle device events from network device
 563  * @nb: the context of the notification
 564  * @evt: the type of event
 565  * @ptr: the net device that the event was on
 566  *
 567  * This function is called by the Ethernet driver in case of link
 568  * change event.
 569  */
 570 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 571                                 void *ptr)
 572 {
 573         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 574         struct net *net = dev_net(dev);
 575         struct tipc_bearer *b_ptr;
 576
 577         b_ptr = rtnl_dereference(dev->tipc_ptr);
 578         if (!b_ptr)
 579                 return NOTIFY_DONE;
 580
 581         b_ptr->mtu = dev->mtu;
 582
 583         switch (evt) {
 584         case NETDEV_CHANGE:
 585                 if (netif_carrier_ok(dev))
 586                         break;
 587         case NETDEV_DOWN:
 588         case NETDEV_CHANGEMTU:
 589                 tipc_reset_bearer(net, b_ptr);
 590                 break;
 591         case NETDEV_CHANGEADDR:
 592                 b_ptr->media->raw2addr(b_ptr, &b_ptr->addr,
 593                                        (char *)dev->dev_addr);
 594                 tipc_reset_bearer(net, b_ptr);
 595                 break;
 596         case NETDEV_UNREGISTER:
 597         case NETDEV_CHANGENAME:
 598                 bearer_disable(dev_net(dev), b_ptr, false);
 599                 break;
 600         }
 601         return NOTIFY_OK;
 602 }
 603
 604 static struct packet_type tipc_packet_type __read_mostly = {
 605         .type = htons(ETH_P_TIPC),
 606         .func = tipc_l2_rcv_msg,
 607 };
 608
 609 static struct notifier_block notifier = {
 610         .notifier_call  = tipc_l2_device_event,
 611         .priority       = 0,
 612 };
 613
 614 int tipc_bearer_setup(void)
 615 {
 616         int err;
 617
 618         err = register_netdevice_notifier(&notifier);
 619         if (err)
 620                 return err;
 621         dev_add_pack(&tipc_packet_type);
 622         return 0;
 623 }
 624
 625 void tipc_bearer_cleanup(void)
 626 {
 627         unregister_netdevice_notifier(&notifier);
 628         dev_remove_pack(&tipc_packet_type);
 629 }
 630
 631 void tipc_bearer_stop(struct net *net)
 632 {
 633         struct tipc_bearer *b_ptr;
 634         u32 i;
 635
 636         for (i = 0; i < MAX_BEARERS; i++) {
 637                 b_ptr = rtnl_dereference(bearer_list[i]);
 638                 if (b_ptr) {
 639                         bearer_disable(net, b_ptr, true);
 640                         bearer_list[i] = NULL;
 641                 }
 642         }
 643 }
 644
 645 /* Caller should hold rtnl_lock to protect the bearer */
 646 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 647                                 struct tipc_bearer *bearer)
 648 {
 649         void *hdr;
 650         struct nlattr *attrs;
 651         struct nlattr *prop;
 652
 653         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family,
 654                           NLM_F_MULTI, TIPC_NL_BEARER_GET);
 655         if (!hdr)
 656                 return -EMSGSIZE;
 657
 658         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
 659         if (!attrs)
 660                 goto msg_full;
 661
 662         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 663                 goto attr_msg_full;
 664
 665         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
 666         if (!prop)
 667                 goto prop_msg_full;
 668         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 669                 goto prop_msg_full;
 670         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 671                 goto prop_msg_full;
 672         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 673                 goto prop_msg_full;
 674
 675         nla_nest_end(msg->skb, prop);
 676         nla_nest_end(msg->skb, attrs);
 677         genlmsg_end(msg->skb, hdr);
 678
 679         return 0;
 680
 681 prop_msg_full:
 682         nla_nest_cancel(msg->skb, prop);
 683 attr_msg_full:
 684         nla_nest_cancel(msg->skb, attrs);
 685 msg_full:
 686         genlmsg_cancel(msg->skb, hdr);
 687
 688         return -EMSGSIZE;
 689 }
 690
 691 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 692 {
 693         int err;
 694         int i = cb->args[0];
 695         struct tipc_bearer *bearer;
 696         struct tipc_nl_msg msg;
 697
 698         if (i == MAX_BEARERS)
 699                 return 0;
 700
 701         msg.skb = skb;
 702         msg.portid = NETLINK_CB(cb->skb).portid;
 703         msg.seq = cb->nlh->nlmsg_seq;
 704
 705         rtnl_lock();
 706         for (i = 0; i < MAX_BEARERS; i++) {
 707                 bearer = rtnl_dereference(bearer_list[i]);
 708                 if (!bearer)
 709                         continue;
 710
 711                 err = __tipc_nl_add_bearer(&msg, bearer);
 712                 if (err)
 713                         break;
 714         }
 715         rtnl_unlock();
 716
 717         cb->args[0] = i;
 718         return skb->len;
 719 }
 720
 721 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 722 {
 723         int err;
 724         char *name;
 725         struct sk_buff *rep;
 726         struct tipc_bearer *bearer;
 727         struct tipc_nl_msg msg;
 728         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 729
 730         if (!info->attrs[TIPC_NLA_BEARER])
 731                 return -EINVAL;
 732
 733         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 734                                info->attrs[TIPC_NLA_BEARER],
 735                                tipc_nl_bearer_policy);
 736         if (err)
 737                 return err;
 738
 739         if (!attrs[TIPC_NLA_BEARER_NAME])
 740                 return -EINVAL;
 741         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 742
 743         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 744         if (!rep)
 745                 return -ENOMEM;
 746
 747         msg.skb = rep;
 748         msg.portid = info->snd_portid;
 749         msg.seq = info->snd_seq;
 750
 751         rtnl_lock();
 752         bearer = tipc_bearer_find(name);
 753         if (!bearer) {
 754                 err = -EINVAL;
 755                 goto err_out;
 756         }
 757
 758         err = __tipc_nl_add_bearer(&msg, bearer);
 759         if (err)
 760                 goto err_out;
 761         rtnl_unlock();
 762
 763         return genlmsg_reply(rep, info);
 764 err_out:
 765         rtnl_unlock();
 766         nlmsg_free(rep);
 767
 768         return err;
 769 }
 770
 771 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 772 {
 773         int err;
 774         char *name;
 775         struct tipc_bearer *bearer;
 776         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 777         struct net *net = genl_info_net(info);
 778
 779         if (!info->attrs[TIPC_NLA_BEARER])
 780                 return -EINVAL;
 781
 782         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 783                                info->attrs[TIPC_NLA_BEARER],
 784                                tipc_nl_bearer_policy);
 785         if (err)
 786                 return err;
 787
 788         if (!attrs[TIPC_NLA_BEARER_NAME])
 789                 return -EINVAL;
 790
 791         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 792
 793         rtnl_lock();
 794         bearer = tipc_bearer_find(name);
 795         if (!bearer) {
 796                 rtnl_unlock();
 797                 return -EINVAL;
 798         }
 799
 800         bearer_disable(net, bearer, false);
 801         rtnl_unlock();
 802
 803         return 0;
 804 }
 805
 806 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 807 {
 808         struct net *net = genl_info_net(info);
 809         int err;
 810         char *bearer;
 811         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 812         u32 domain;
 813         u32 prio;
 814
 815         prio = TIPC_MEDIA_LINK_PRI;
 816         domain = tipc_own_addr & TIPC_CLUSTER_MASK;
 817
 818         if (!info->attrs[TIPC_NLA_BEARER])
 819                 return -EINVAL;
 820
 821         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 822                                info->attrs[TIPC_NLA_BEARER],
 823                                tipc_nl_bearer_policy);
 824         if (err)
 825                 return err;
 826
 827         if (!attrs[TIPC_NLA_BEARER_NAME])
 828                 return -EINVAL;
 829
 830         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 831
 832         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 833                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 834
 835         if (attrs[TIPC_NLA_BEARER_PROP]) {
 836                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 837
 838                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 839                                               props);
 840                 if (err)
 841                         return err;
 842
 843                 if (props[TIPC_NLA_PROP_PRIO])
 844                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 845         }
 846
 847         rtnl_lock();
 848         err = tipc_enable_bearer(net, bearer, domain, prio);
 849         if (err) {
 850                 rtnl_unlock();
 851                 return err;
 852         }
 853         rtnl_unlock();
 854
 855         return 0;
 856 }
 857
 858 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 859 {
 860         int err;
 861         char *name;
 862         struct tipc_bearer *b;
 863         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 864
 865         if (!info->attrs[TIPC_NLA_BEARER])
 866                 return -EINVAL;
 867
 868         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 869                                info->attrs[TIPC_NLA_BEARER],
 870                                tipc_nl_bearer_policy);
 871         if (err)
 872                 return err;
 873
 874         if (!attrs[TIPC_NLA_BEARER_NAME])
 875                 return -EINVAL;
 876         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 877
 878         rtnl_lock();
 879         b = tipc_bearer_find(name);
 880         if (!b) {
 881                 rtnl_unlock();
 882                 return -EINVAL;
 883         }
 884
 885         if (attrs[TIPC_NLA_BEARER_PROP]) {
 886                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 887
 888                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 889                                               props);
 890                 if (err) {
 891                         rtnl_unlock();
 892                         return err;
 893                 }
 894
 895                 if (props[TIPC_NLA_PROP_TOL])
 896                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
 897                 if (props[TIPC_NLA_PROP_PRIO])
 898                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 899                 if (props[TIPC_NLA_PROP_WIN])
 900                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
 901         }
 902         rtnl_unlock();
 903
 904         return 0;
 905 }
 906
 907 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
 908                                struct tipc_media *media)
 909 {
 910         void *hdr;
 911         struct nlattr *attrs;
 912         struct nlattr *prop;
 913
 914         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family,
 915                           NLM_F_MULTI, TIPC_NL_MEDIA_GET);
 916         if (!hdr)
 917                 return -EMSGSIZE;
 918
 919         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
 920         if (!attrs)
 921                 goto msg_full;
 922
 923         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
 924                 goto attr_msg_full;
 925
 926         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
 927         if (!prop)
 928                 goto prop_msg_full;
 929         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
 930                 goto prop_msg_full;
 931         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
 932                 goto prop_msg_full;
 933         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
 934                 goto prop_msg_full;
 935
 936         nla_nest_end(msg->skb, prop);
 937         nla_nest_end(msg->skb, attrs);
 938         genlmsg_end(msg->skb, hdr);
 939
 940         return 0;
 941
 942 prop_msg_full:
 943         nla_nest_cancel(msg->skb, prop);
 944 attr_msg_full:
 945         nla_nest_cancel(msg->skb, attrs);
 946 msg_full:
 947         genlmsg_cancel(msg->skb, hdr);
 948
 949         return -EMSGSIZE;
 950 }
 951
 952 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
 953 {
 954         int err;
 955         int i = cb->args[0];
 956         struct tipc_nl_msg msg;
 957
 958         if (i == MAX_MEDIA)
 959                 return 0;
 960
 961         msg.skb = skb;
 962         msg.portid = NETLINK_CB(cb->skb).portid;
 963         msg.seq = cb->nlh->nlmsg_seq;
 964
 965         rtnl_lock();
 966         for (; media_info_array[i] != NULL; i++) {
 967                 err = __tipc_nl_add_media(&msg, media_info_array[i]);
 968                 if (err)
 969                         break;
 970         }
 971         rtnl_unlock();
 972
 973         cb->args[0] = i;
 974         return skb->len;
 975 }
 976
 977 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 978 {
 979         int err;
 980         char *name;
 981         struct tipc_nl_msg msg;
 982         struct tipc_media *media;
 983         struct sk_buff *rep;
 984         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 985
 986         if (!info->attrs[TIPC_NLA_MEDIA])
 987                 return -EINVAL;
 988
 989         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
 990                                info->attrs[TIPC_NLA_MEDIA],
 991                                tipc_nl_media_policy);
 992         if (err)
 993                 return err;
 994
 995         if (!attrs[TIPC_NLA_MEDIA_NAME])
 996                 return -EINVAL;
 997         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
 998
 999         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1000         if (!rep)
1001                 return -ENOMEM;
1002
1003         msg.skb = rep;
1004         msg.portid = info->snd_portid;
1005         msg.seq = info->snd_seq;
1006
1007         rtnl_lock();
1008         media = tipc_media_find(name);
1009         if (!media) {
1010                 err = -EINVAL;
1011                 goto err_out;
1012         }
1013
1014         err = __tipc_nl_add_media(&msg, media);
1015         if (err)
1016                 goto err_out;
1017         rtnl_unlock();
1018
1019         return genlmsg_reply(rep, info);
1020 err_out:
1021         rtnl_unlock();
1022         nlmsg_free(rep);
1023
1024         return err;
1025 }
1026
1027 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1028 {
1029         int err;
1030         char *name;
1031         struct tipc_media *m;
1032         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1033
1034         if (!info->attrs[TIPC_NLA_MEDIA])
1035                 return -EINVAL;
1036
1037         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1038                                info->attrs[TIPC_NLA_MEDIA],
1039                                tipc_nl_media_policy);
1040
1041         if (!attrs[TIPC_NLA_MEDIA_NAME])
1042                 return -EINVAL;
1043         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1044
1045         rtnl_lock();
1046         m = tipc_media_find(name);
1047         if (!m) {
1048                 rtnl_unlock();
1049                 return -EINVAL;
1050         }
1051
1052         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1053                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1054
1055                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1056                                               props);
1057                 if (err) {
1058                         rtnl_unlock();
1059                         return err;
1060                 }
1061
1062                 if (props[TIPC_NLA_PROP_TOL])
1063                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1064                 if (props[TIPC_NLA_PROP_PRIO])
1065                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1066                 if (props[TIPC_NLA_PROP_WIN])
1067                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1068         }
1069         rtnl_unlock();
1070
1071         return 0;
1072 }