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