net/tipc/bearer.c

   1 /*
   2  * net/tipc/bearer.c: TIPC bearer code
   3  *
   4  * Copyright (c) 1996-2006, 2013-2016, 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 "monitor.h"
  43 #include "bcast.h"
  44 #include "netlink.h"
  45 #include "udp_media.h"
  46
  47 #define MAX_ADDR_STR 60
  48
  49 static struct tipc_media * const media_info_array[] = {
  50         &eth_media_info,
  51 #ifdef CONFIG_TIPC_MEDIA_IB
  52         &ib_media_info,
  53 #endif
  54 #ifdef CONFIG_TIPC_MEDIA_UDP
  55         &udp_media_info,
  56 #endif
  57         NULL
  58 };
  59
  60 static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
  61 {
  62         struct tipc_net *tn = tipc_net(net);
  63
  64         return rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
  65 }
  66
  67 static void bearer_disable(struct net *net, struct tipc_bearer *b);
  68 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
  69                            struct packet_type *pt, struct net_device *orig_dev);
  70
  71 /**
  72  * tipc_media_find - locates specified media object by name
  73  */
  74 struct tipc_media *tipc_media_find(const char *name)
  75 {
  76         u32 i;
  77
  78         for (i = 0; media_info_array[i] != NULL; i++) {
  79                 if (!strcmp(media_info_array[i]->name, name))
  80                         break;
  81         }
  82         return media_info_array[i];
  83 }
  84
  85 /**
  86  * media_find_id - locates specified media object by type identifier
  87  */
  88 static struct tipc_media *media_find_id(u8 type)
  89 {
  90         u32 i;
  91
  92         for (i = 0; media_info_array[i] != NULL; i++) {
  93                 if (media_info_array[i]->type_id == type)
  94                         break;
  95         }
  96         return media_info_array[i];
  97 }
  98
  99 /**
 100  * tipc_media_addr_printf - record media address in print buffer
 101  */
 102 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
 103 {
 104         char addr_str[MAX_ADDR_STR];
 105         struct tipc_media *m;
 106         int ret;
 107
 108         m = media_find_id(a->media_id);
 109
 110         if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
 111                 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
 112         else {
 113                 u32 i;
 114
 115                 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
 116                 for (i = 0; i < sizeof(a->value); i++)
 117                         ret += scnprintf(buf - ret, len + ret,
 118                                             "-%02x", a->value[i]);
 119         }
 120 }
 121
 122 /**
 123  * bearer_name_validate - validate & (optionally) deconstruct bearer name
 124  * @name: ptr to bearer name string
 125  * @name_parts: ptr to area for bearer name components (or NULL if not needed)
 126  *
 127  * Returns 1 if bearer name is valid, otherwise 0.
 128  */
 129 static int bearer_name_validate(const char *name,
 130                                 struct tipc_bearer_names *name_parts)
 131 {
 132         char name_copy[TIPC_MAX_BEARER_NAME];
 133         char *media_name;
 134         char *if_name;
 135         u32 media_len;
 136         u32 if_len;
 137
 138         /* copy bearer name & ensure length is OK */
 139         name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 140         /* need above in case non-Posix strncpy() doesn't pad with nulls */
 141         strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 142         if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 143                 return 0;
 144
 145         /* ensure all component parts of bearer name are present */
 146         media_name = name_copy;
 147         if_name = strchr(media_name, ':');
 148         if (if_name == NULL)
 149                 return 0;
 150         *(if_name++) = 0;
 151         media_len = if_name - media_name;
 152         if_len = strlen(if_name) + 1;
 153
 154         /* validate component parts of bearer name */
 155         if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 156             (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
 157                 return 0;
 158
 159         /* return bearer name components, if necessary */
 160         if (name_parts) {
 161                 strcpy(name_parts->media_name, media_name);
 162                 strcpy(name_parts->if_name, if_name);
 163         }
 164         return 1;
 165 }
 166
 167 /**
 168  * tipc_bearer_find - locates bearer object with matching bearer name
 169  */
 170 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
 171 {
 172         struct tipc_net *tn = net_generic(net, tipc_net_id);
 173         struct tipc_bearer *b;
 174         u32 i;
 175
 176         for (i = 0; i < MAX_BEARERS; i++) {
 177                 b = rtnl_dereference(tn->bearer_list[i]);
 178                 if (b && (!strcmp(b->name, name)))
 179                         return b;
 180         }
 181         return NULL;
 182 }
 183
 184 /*     tipc_bearer_get_name - get the bearer name from its id.
 185  *     @net: network namespace
 186  *     @name: a pointer to the buffer where the name will be stored.
 187  *     @bearer_id: the id to get the name from.
 188  */
 189 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
 190 {
 191         struct tipc_net *tn = tipc_net(net);
 192         struct tipc_bearer *b;
 193
 194         if (bearer_id >= MAX_BEARERS)
 195                 return -EINVAL;
 196
 197         b = rtnl_dereference(tn->bearer_list[bearer_id]);
 198         if (!b)
 199                 return -EINVAL;
 200
 201         strcpy(name, b->name);
 202         return 0;
 203 }
 204
 205 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
 206 {
 207         struct tipc_net *tn = net_generic(net, tipc_net_id);
 208         struct tipc_bearer *b;
 209
 210         rcu_read_lock();
 211         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 212         if (b)
 213                 tipc_disc_add_dest(b->disc);
 214         rcu_read_unlock();
 215 }
 216
 217 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
 218 {
 219         struct tipc_net *tn = net_generic(net, tipc_net_id);
 220         struct tipc_bearer *b;
 221
 222         rcu_read_lock();
 223         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 224         if (b)
 225                 tipc_disc_remove_dest(b->disc);
 226         rcu_read_unlock();
 227 }
 228
 229 /**
 230  * tipc_enable_bearer - enable bearer with the given name
 231  */
 232 static int tipc_enable_bearer(struct net *net, const char *name,
 233                               u32 disc_domain, u32 prio,
 234                               struct nlattr *attr[])
 235 {
 236         struct tipc_net *tn = tipc_net(net);
 237         struct tipc_bearer_names b_names;
 238         int with_this_prio = 1;
 239         struct tipc_bearer *b;
 240         struct tipc_media *m;
 241         struct sk_buff *skb;
 242         int bearer_id = 0;
 243         int res = -EINVAL;
 244         char *errstr = "";
 245
 246         if (!bearer_name_validate(name, &b_names)) {
 247                 errstr = "illegal name";
 248                 goto rejected;
 249         }
 250
 251         if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
 252                 errstr = "illegal priority";
 253                 goto rejected;
 254         }
 255
 256         m = tipc_media_find(b_names.media_name);
 257         if (!m) {
 258                 errstr = "media not registered";
 259                 goto rejected;
 260         }
 261
 262         if (prio == TIPC_MEDIA_LINK_PRI)
 263                 prio = m->priority;
 264
 265         /* Check new bearer vs existing ones and find free bearer id if any */
 266         while (bearer_id < MAX_BEARERS) {
 267                 b = rtnl_dereference(tn->bearer_list[bearer_id]);
 268                 if (!b)
 269                         break;
 270                 if (!strcmp(name, b->name)) {
 271                         errstr = "already enabled";
 272                         goto rejected;
 273                 }
 274                 bearer_id++;
 275                 if (b->priority != prio)
 276                         continue;
 277                 if (++with_this_prio <= 2)
 278                         continue;
 279                 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
 280                         name, prio);
 281                 if (prio == TIPC_MIN_LINK_PRI) {
 282                         errstr = "cannot adjust to lower";
 283                         goto rejected;
 284                 }
 285                 pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
 286                 prio--;
 287                 bearer_id = 0;
 288                 with_this_prio = 1;
 289         }
 290
 291         if (bearer_id >= MAX_BEARERS) {
 292                 errstr = "max 3 bearers permitted";
 293                 goto rejected;
 294         }
 295
 296         b = kzalloc(sizeof(*b), GFP_ATOMIC);
 297         if (!b)
 298                 return -ENOMEM;
 299
 300         strcpy(b->name, name);
 301         b->media = m;
 302         res = m->enable_media(net, b, attr);
 303         if (res) {
 304                 kfree(b);
 305                 errstr = "failed to enable media";
 306                 goto rejected;
 307         }
 308
 309         b->identity = bearer_id;
 310         b->tolerance = m->tolerance;
 311         b->window = m->window;
 312         b->domain = disc_domain;
 313         b->net_plane = bearer_id + 'A';
 314         b->priority = prio;
 315         test_and_set_bit_lock(0, &b->up);
 316
 317         res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
 318         if (res) {
 319                 bearer_disable(net, b);
 320                 kfree(b);
 321                 errstr = "failed to create discoverer";
 322                 goto rejected;
 323         }
 324
 325         rcu_assign_pointer(tn->bearer_list[bearer_id], b);
 326         if (skb)
 327                 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
 328
 329         if (tipc_mon_create(net, bearer_id)) {
 330                 bearer_disable(net, b);
 331                 return -ENOMEM;
 332         }
 333
 334         pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
 335
 336         return res;
 337 rejected:
 338         pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
 339         return res;
 340 }
 341
 342 /**
 343  * tipc_reset_bearer - Reset all links established over this bearer
 344  */
 345 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
 346 {
 347         pr_info("Resetting bearer <%s>\n", b->name);
 348         tipc_node_delete_links(net, b->identity);
 349         tipc_disc_reset(net, b);
 350         return 0;
 351 }
 352
 353 /**
 354  * bearer_disable
 355  *
 356  * Note: This routine assumes caller holds RTNL lock.
 357  */
 358 static void bearer_disable(struct net *net, struct tipc_bearer *b)
 359 {
 360         struct tipc_net *tn = tipc_net(net);
 361         int bearer_id = b->identity;
 362
 363         pr_info("Disabling bearer <%s>\n", b->name);
 364         clear_bit_unlock(0, &b->up);
 365         tipc_node_delete_links(net, bearer_id);
 366         b->media->disable_media(b);
 367         RCU_INIT_POINTER(b->media_ptr, NULL);
 368         if (b->disc)
 369                 tipc_disc_delete(b->disc);
 370         RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
 371         kfree_rcu(b, rcu);
 372         tipc_mon_delete(net, bearer_id);
 373 }
 374
 375 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 376                          struct nlattr *attr[])
 377 {
 378         char *dev_name = strchr((const char *)b->name, ':') + 1;
 379         int hwaddr_len = b->media->hwaddr_len;
 380         u8 node_id[NODE_ID_LEN] = {0,};
 381         struct net_device *dev;
 382
 383         /* Find device with specified name */
 384         dev = dev_get_by_name(net, dev_name);
 385         if (!dev)
 386                 return -ENODEV;
 387         if (tipc_mtu_bad(dev, 0)) {
 388                 dev_put(dev);
 389                 return -EINVAL;
 390         }
 391
 392         /* Autoconfigure own node identity if needed */
 393         if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
 394                 memcpy(node_id, dev->dev_addr, hwaddr_len);
 395                 tipc_net_init(net, node_id, 0);
 396         }
 397         if (!tipc_own_id(net)) {
 398                 dev_put(dev);
 399                 pr_warn("Failed to obtain node identity\n");
 400                 return -EINVAL;
 401         }
 402
 403         /* Associate TIPC bearer with L2 bearer */
 404         rcu_assign_pointer(b->media_ptr, dev);
 405         b->pt.dev = dev;
 406         b->pt.type = htons(ETH_P_TIPC);
 407         b->pt.func = tipc_l2_rcv_msg;
 408         dev_add_pack(&b->pt);
 409         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 410         memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
 411         b->bcast_addr.media_id = b->media->type_id;
 412         b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
 413         b->mtu = dev->mtu;
 414         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 415         rcu_assign_pointer(dev->tipc_ptr, b);
 416         return 0;
 417 }
 418
 419 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 420  *
 421  * Mark L2 bearer as inactive so that incoming buffers are thrown away
 422  */
 423 void tipc_disable_l2_media(struct tipc_bearer *b)
 424 {
 425         struct net_device *dev;
 426
 427         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 428         dev_remove_pack(&b->pt);
 429         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 430         synchronize_net();
 431         dev_put(dev);
 432 }
 433
 434 /**
 435  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 436  * @skb: the packet to be sent
 437  * @b: the bearer through which the packet is to be sent
 438  * @dest: peer destination address
 439  */
 440 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
 441                      struct tipc_bearer *b, struct tipc_media_addr *dest)
 442 {
 443         struct net_device *dev;
 444         int delta;
 445
 446         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
 447         if (!dev)
 448                 return 0;
 449
 450         delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
 451         if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
 452                 kfree_skb(skb);
 453                 return 0;
 454         }
 455         skb_reset_network_header(skb);
 456         skb->dev = dev;
 457         skb->protocol = htons(ETH_P_TIPC);
 458         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
 459                         dev->dev_addr, skb->len);
 460         dev_queue_xmit(skb);
 461         return 0;
 462 }
 463
 464 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
 465 {
 466         bool supp = false;
 467         struct tipc_bearer *b;
 468
 469         rcu_read_lock();
 470         b = bearer_get(net, bearer_id);
 471         if (b)
 472                 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
 473         rcu_read_unlock();
 474         return supp;
 475 }
 476
 477 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
 478 {
 479         int mtu = 0;
 480         struct tipc_bearer *b;
 481
 482         rcu_read_lock();
 483         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
 484         if (b)
 485                 mtu = b->mtu;
 486         rcu_read_unlock();
 487         return mtu;
 488 }
 489
 490 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
 491  */
 492 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
 493                           struct sk_buff *skb,
 494                           struct tipc_media_addr *dest)
 495 {
 496         struct tipc_msg *hdr = buf_msg(skb);
 497         struct tipc_bearer *b;
 498
 499         rcu_read_lock();
 500         b = bearer_get(net, bearer_id);
 501         if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
 502                 b->media->send_msg(net, skb, b, dest);
 503         else
 504                 kfree_skb(skb);
 505         rcu_read_unlock();
 506 }
 507
 508 /* tipc_bearer_xmit() -send buffer to destination over bearer
 509  */
 510 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
 511                       struct sk_buff_head *xmitq,
 512                       struct tipc_media_addr *dst)
 513 {
 514         struct tipc_bearer *b;
 515         struct sk_buff *skb, *tmp;
 516
 517         if (skb_queue_empty(xmitq))
 518                 return;
 519
 520         rcu_read_lock();
 521         b = bearer_get(net, bearer_id);
 522         if (unlikely(!b))
 523                 __skb_queue_purge(xmitq);
 524         skb_queue_walk_safe(xmitq, skb, tmp) {
 525                 __skb_dequeue(xmitq);
 526                 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
 527                         b->media->send_msg(net, skb, b, dst);
 528                 else
 529                         kfree_skb(skb);
 530         }
 531         rcu_read_unlock();
 532 }
 533
 534 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
 535  */
 536 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
 537                          struct sk_buff_head *xmitq)
 538 {
 539         struct tipc_net *tn = tipc_net(net);
 540         int net_id = tn->net_id;
 541         struct tipc_bearer *b;
 542         struct sk_buff *skb, *tmp;
 543         struct tipc_msg *hdr;
 544
 545         rcu_read_lock();
 546         b = bearer_get(net, bearer_id);
 547         if (unlikely(!b || !test_bit(0, &b->up)))
 548                 __skb_queue_purge(xmitq);
 549         skb_queue_walk_safe(xmitq, skb, tmp) {
 550                 hdr = buf_msg(skb);
 551                 msg_set_non_seq(hdr, 1);
 552                 msg_set_mc_netid(hdr, net_id);
 553                 __skb_dequeue(xmitq);
 554                 b->media->send_msg(net, skb, b, &b->bcast_addr);
 555         }
 556         rcu_read_unlock();
 557 }
 558
 559 /**
 560  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 561  * @buf: the received packet
 562  * @dev: the net device that the packet was received on
 563  * @pt: the packet_type structure which was used to register this handler
 564  * @orig_dev: the original receive net device in case the device is a bond
 565  *
 566  * Accept only packets explicitly sent to this node, or broadcast packets;
 567  * ignores packets sent using interface multicast, and traffic sent to other
 568  * nodes (which can happen if interface is running in promiscuous mode).
 569  */
 570 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
 571                            struct packet_type *pt, struct net_device *orig_dev)
 572 {
 573         struct tipc_bearer *b;
 574
 575         rcu_read_lock();
 576         b = rcu_dereference_rtnl(dev->tipc_ptr) ?:
 577                 rcu_dereference_rtnl(orig_dev->tipc_ptr);
 578         if (likely(b && test_bit(0, &b->up) &&
 579                    (skb->pkt_type <= PACKET_MULTICAST))) {
 580                 skb->next = NULL;
 581                 tipc_rcv(dev_net(b->pt.dev), skb, b);
 582                 rcu_read_unlock();
 583                 return NET_RX_SUCCESS;
 584         }
 585         rcu_read_unlock();
 586         kfree_skb(skb);
 587         return NET_RX_DROP;
 588 }
 589
 590 /**
 591  * tipc_l2_device_event - handle device events from network device
 592  * @nb: the context of the notification
 593  * @evt: the type of event
 594  * @ptr: the net device that the event was on
 595  *
 596  * This function is called by the Ethernet driver in case of link
 597  * change event.
 598  */
 599 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 600                                 void *ptr)
 601 {
 602         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 603         struct net *net = dev_net(dev);
 604         struct tipc_bearer *b;
 605
 606         b = rtnl_dereference(dev->tipc_ptr);
 607         if (!b)
 608                 return NOTIFY_DONE;
 609
 610         switch (evt) {
 611         case NETDEV_CHANGE:
 612                 if (netif_carrier_ok(dev))
 613                         break;
 614                 /* else: fall through */
 615         case NETDEV_UP:
 616                 test_and_set_bit_lock(0, &b->up);
 617                 break;
 618         case NETDEV_GOING_DOWN:
 619                 clear_bit_unlock(0, &b->up);
 620                 tipc_reset_bearer(net, b);
 621                 break;
 622         case NETDEV_CHANGEMTU:
 623                 if (tipc_mtu_bad(dev, 0)) {
 624                         bearer_disable(net, b);
 625                         break;
 626                 }
 627                 b->mtu = dev->mtu;
 628                 tipc_reset_bearer(net, b);
 629                 break;
 630         case NETDEV_CHANGEADDR:
 631                 b->media->raw2addr(b, &b->addr,
 632                                    (char *)dev->dev_addr);
 633                 tipc_reset_bearer(net, b);
 634                 break;
 635         case NETDEV_UNREGISTER:
 636         case NETDEV_CHANGENAME:
 637                 bearer_disable(net, b);
 638                 break;
 639         }
 640         return NOTIFY_OK;
 641 }
 642
 643 static struct notifier_block notifier = {
 644         .notifier_call  = tipc_l2_device_event,
 645         .priority       = 0,
 646 };
 647
 648 int tipc_bearer_setup(void)
 649 {
 650         return register_netdevice_notifier(&notifier);
 651 }
 652
 653 void tipc_bearer_cleanup(void)
 654 {
 655         unregister_netdevice_notifier(&notifier);
 656 }
 657
 658 void tipc_bearer_stop(struct net *net)
 659 {
 660         struct tipc_net *tn = net_generic(net, tipc_net_id);
 661         struct tipc_bearer *b;
 662         u32 i;
 663
 664         for (i = 0; i < MAX_BEARERS; i++) {
 665                 b = rtnl_dereference(tn->bearer_list[i]);
 666                 if (b) {
 667                         bearer_disable(net, b);
 668                         tn->bearer_list[i] = NULL;
 669                 }
 670         }
 671 }
 672
 673 /* Caller should hold rtnl_lock to protect the bearer */
 674 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 675                                 struct tipc_bearer *bearer, int nlflags)
 676 {
 677         void *hdr;
 678         struct nlattr *attrs;
 679         struct nlattr *prop;
 680
 681         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 682                           nlflags, TIPC_NL_BEARER_GET);
 683         if (!hdr)
 684                 return -EMSGSIZE;
 685
 686         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
 687         if (!attrs)
 688                 goto msg_full;
 689
 690         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 691                 goto attr_msg_full;
 692
 693         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
 694         if (!prop)
 695                 goto prop_msg_full;
 696         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 697                 goto prop_msg_full;
 698         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 699                 goto prop_msg_full;
 700         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 701                 goto prop_msg_full;
 702         if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
 703                 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
 704                         goto prop_msg_full;
 705
 706         nla_nest_end(msg->skb, prop);
 707
 708 #ifdef CONFIG_TIPC_MEDIA_UDP
 709         if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
 710                 if (tipc_udp_nl_add_bearer_data(msg, bearer))
 711                         goto attr_msg_full;
 712         }
 713 #endif
 714
 715         nla_nest_end(msg->skb, attrs);
 716         genlmsg_end(msg->skb, hdr);
 717
 718         return 0;
 719
 720 prop_msg_full:
 721         nla_nest_cancel(msg->skb, prop);
 722 attr_msg_full:
 723         nla_nest_cancel(msg->skb, attrs);
 724 msg_full:
 725         genlmsg_cancel(msg->skb, hdr);
 726
 727         return -EMSGSIZE;
 728 }
 729
 730 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 731 {
 732         int err;
 733         int i = cb->args[0];
 734         struct tipc_bearer *bearer;
 735         struct tipc_nl_msg msg;
 736         struct net *net = sock_net(skb->sk);
 737         struct tipc_net *tn = net_generic(net, tipc_net_id);
 738
 739         if (i == MAX_BEARERS)
 740                 return 0;
 741
 742         msg.skb = skb;
 743         msg.portid = NETLINK_CB(cb->skb).portid;
 744         msg.seq = cb->nlh->nlmsg_seq;
 745
 746         rtnl_lock();
 747         for (i = 0; i < MAX_BEARERS; i++) {
 748                 bearer = rtnl_dereference(tn->bearer_list[i]);
 749                 if (!bearer)
 750                         continue;
 751
 752                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
 753                 if (err)
 754                         break;
 755         }
 756         rtnl_unlock();
 757
 758         cb->args[0] = i;
 759         return skb->len;
 760 }
 761
 762 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 763 {
 764         int err;
 765         char *name;
 766         struct sk_buff *rep;
 767         struct tipc_bearer *bearer;
 768         struct tipc_nl_msg msg;
 769         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 770         struct net *net = genl_info_net(info);
 771
 772         if (!info->attrs[TIPC_NLA_BEARER])
 773                 return -EINVAL;
 774
 775         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 776                                info->attrs[TIPC_NLA_BEARER],
 777                                tipc_nl_bearer_policy, info->extack);
 778         if (err)
 779                 return err;
 780
 781         if (!attrs[TIPC_NLA_BEARER_NAME])
 782                 return -EINVAL;
 783         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 784
 785         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 786         if (!rep)
 787                 return -ENOMEM;
 788
 789         msg.skb = rep;
 790         msg.portid = info->snd_portid;
 791         msg.seq = info->snd_seq;
 792
 793         rtnl_lock();
 794         bearer = tipc_bearer_find(net, name);
 795         if (!bearer) {
 796                 err = -EINVAL;
 797                 goto err_out;
 798         }
 799
 800         err = __tipc_nl_add_bearer(&msg, bearer, 0);
 801         if (err)
 802                 goto err_out;
 803         rtnl_unlock();
 804
 805         return genlmsg_reply(rep, info);
 806 err_out:
 807         rtnl_unlock();
 808         nlmsg_free(rep);
 809
 810         return err;
 811 }
 812
 813 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 814 {
 815         int err;
 816         char *name;
 817         struct tipc_bearer *bearer;
 818         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 819         struct net *net = sock_net(skb->sk);
 820
 821         if (!info->attrs[TIPC_NLA_BEARER])
 822                 return -EINVAL;
 823
 824         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 825                                info->attrs[TIPC_NLA_BEARER],
 826                                tipc_nl_bearer_policy, info->extack);
 827         if (err)
 828                 return err;
 829
 830         if (!attrs[TIPC_NLA_BEARER_NAME])
 831                 return -EINVAL;
 832
 833         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 834
 835         bearer = tipc_bearer_find(net, name);
 836         if (!bearer)
 837                 return -EINVAL;
 838
 839         bearer_disable(net, bearer);
 840
 841         return 0;
 842 }
 843
 844 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 845 {
 846         int err;
 847
 848         rtnl_lock();
 849         err = __tipc_nl_bearer_disable(skb, info);
 850         rtnl_unlock();
 851
 852         return err;
 853 }
 854
 855 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 856 {
 857         int err;
 858         char *bearer;
 859         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 860         struct net *net = sock_net(skb->sk);
 861         u32 domain = 0;
 862         u32 prio;
 863
 864         prio = TIPC_MEDIA_LINK_PRI;
 865
 866         if (!info->attrs[TIPC_NLA_BEARER])
 867                 return -EINVAL;
 868
 869         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 870                                info->attrs[TIPC_NLA_BEARER],
 871                                tipc_nl_bearer_policy, info->extack);
 872         if (err)
 873                 return err;
 874
 875         if (!attrs[TIPC_NLA_BEARER_NAME])
 876                 return -EINVAL;
 877
 878         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 879
 880         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 881                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 882
 883         if (attrs[TIPC_NLA_BEARER_PROP]) {
 884                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 885
 886                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 887                                               props);
 888                 if (err)
 889                         return err;
 890
 891                 if (props[TIPC_NLA_PROP_PRIO])
 892                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 893         }
 894
 895         return tipc_enable_bearer(net, bearer, domain, prio, attrs);
 896 }
 897
 898 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 899 {
 900         int err;
 901
 902         rtnl_lock();
 903         err = __tipc_nl_bearer_enable(skb, info);
 904         rtnl_unlock();
 905
 906         return err;
 907 }
 908
 909 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
 910 {
 911         int err;
 912         char *name;
 913         struct tipc_bearer *b;
 914         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 915         struct net *net = sock_net(skb->sk);
 916
 917         if (!info->attrs[TIPC_NLA_BEARER])
 918                 return -EINVAL;
 919
 920         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 921                                info->attrs[TIPC_NLA_BEARER],
 922                                tipc_nl_bearer_policy, info->extack);
 923         if (err)
 924                 return err;
 925
 926         if (!attrs[TIPC_NLA_BEARER_NAME])
 927                 return -EINVAL;
 928         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 929
 930         rtnl_lock();
 931         b = tipc_bearer_find(net, name);
 932         if (!b) {
 933                 rtnl_unlock();
 934                 return -EINVAL;
 935         }
 936
 937 #ifdef CONFIG_TIPC_MEDIA_UDP
 938         if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
 939                 err = tipc_udp_nl_bearer_add(b,
 940                                              attrs[TIPC_NLA_BEARER_UDP_OPTS]);
 941                 if (err) {
 942                         rtnl_unlock();
 943                         return err;
 944                 }
 945         }
 946 #endif
 947         rtnl_unlock();
 948
 949         return 0;
 950 }
 951
 952 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 953 {
 954         struct tipc_bearer *b;
 955         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 956         struct net *net = sock_net(skb->sk);
 957         char *name;
 958         int err;
 959
 960         if (!info->attrs[TIPC_NLA_BEARER])
 961                 return -EINVAL;
 962
 963         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 964                                info->attrs[TIPC_NLA_BEARER],
 965                                tipc_nl_bearer_policy, info->extack);
 966         if (err)
 967                 return err;
 968
 969         if (!attrs[TIPC_NLA_BEARER_NAME])
 970                 return -EINVAL;
 971         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 972
 973         b = tipc_bearer_find(net, name);
 974         if (!b)
 975                 return -EINVAL;
 976
 977         if (attrs[TIPC_NLA_BEARER_PROP]) {
 978                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 979
 980                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 981                                               props);
 982                 if (err)
 983                         return err;
 984
 985                 if (props[TIPC_NLA_PROP_TOL]) {
 986                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
 987                         tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
 988                 }
 989                 if (props[TIPC_NLA_PROP_PRIO])
 990                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 991                 if (props[TIPC_NLA_PROP_WIN])
 992                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
 993                 if (props[TIPC_NLA_PROP_MTU]) {
 994                         if (b->media->type_id != TIPC_MEDIA_TYPE_UDP)
 995                                 return -EINVAL;
 996 #ifdef CONFIG_TIPC_MEDIA_UDP
 997                         if (tipc_udp_mtu_bad(nla_get_u32
 998                                              (props[TIPC_NLA_PROP_MTU])))
 999                                 return -EINVAL;
1000                         b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1001                         tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1002 #endif
1003                 }
1004         }
1005
1006         return 0;
1007 }
1008
1009 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1010 {
1011         int err;
1012
1013         rtnl_lock();
1014         err = __tipc_nl_bearer_set(skb, info);
1015         rtnl_unlock();
1016
1017         return err;
1018 }
1019
1020 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1021                                struct tipc_media *media, int nlflags)
1022 {
1023         void *hdr;
1024         struct nlattr *attrs;
1025         struct nlattr *prop;
1026
1027         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1028                           nlflags, TIPC_NL_MEDIA_GET);
1029         if (!hdr)
1030                 return -EMSGSIZE;
1031
1032         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1033         if (!attrs)
1034                 goto msg_full;
1035
1036         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1037                 goto attr_msg_full;
1038
1039         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1040         if (!prop)
1041                 goto prop_msg_full;
1042         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1043                 goto prop_msg_full;
1044         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1045                 goto prop_msg_full;
1046         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1047                 goto prop_msg_full;
1048         if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1049                 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1050                         goto prop_msg_full;
1051
1052         nla_nest_end(msg->skb, prop);
1053         nla_nest_end(msg->skb, attrs);
1054         genlmsg_end(msg->skb, hdr);
1055
1056         return 0;
1057
1058 prop_msg_full:
1059         nla_nest_cancel(msg->skb, prop);
1060 attr_msg_full:
1061         nla_nest_cancel(msg->skb, attrs);
1062 msg_full:
1063         genlmsg_cancel(msg->skb, hdr);
1064
1065         return -EMSGSIZE;
1066 }
1067
1068 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1069 {
1070         int err;
1071         int i = cb->args[0];
1072         struct tipc_nl_msg msg;
1073
1074         if (i == MAX_MEDIA)
1075                 return 0;
1076
1077         msg.skb = skb;
1078         msg.portid = NETLINK_CB(cb->skb).portid;
1079         msg.seq = cb->nlh->nlmsg_seq;
1080
1081         rtnl_lock();
1082         for (; media_info_array[i] != NULL; i++) {
1083                 err = __tipc_nl_add_media(&msg, media_info_array[i],
1084                                           NLM_F_MULTI);
1085                 if (err)
1086                         break;
1087         }
1088         rtnl_unlock();
1089
1090         cb->args[0] = i;
1091         return skb->len;
1092 }
1093
1094 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1095 {
1096         int err;
1097         char *name;
1098         struct tipc_nl_msg msg;
1099         struct tipc_media *media;
1100         struct sk_buff *rep;
1101         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1102
1103         if (!info->attrs[TIPC_NLA_MEDIA])
1104                 return -EINVAL;
1105
1106         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1107                                info->attrs[TIPC_NLA_MEDIA],
1108                                tipc_nl_media_policy, info->extack);
1109         if (err)
1110                 return err;
1111
1112         if (!attrs[TIPC_NLA_MEDIA_NAME])
1113                 return -EINVAL;
1114         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1115
1116         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1117         if (!rep)
1118                 return -ENOMEM;
1119
1120         msg.skb = rep;
1121         msg.portid = info->snd_portid;
1122         msg.seq = info->snd_seq;
1123
1124         rtnl_lock();
1125         media = tipc_media_find(name);
1126         if (!media) {
1127                 err = -EINVAL;
1128                 goto err_out;
1129         }
1130
1131         err = __tipc_nl_add_media(&msg, media, 0);
1132         if (err)
1133                 goto err_out;
1134         rtnl_unlock();
1135
1136         return genlmsg_reply(rep, info);
1137 err_out:
1138         rtnl_unlock();
1139         nlmsg_free(rep);
1140
1141         return err;
1142 }
1143
1144 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1145 {
1146         int err;
1147         char *name;
1148         struct tipc_media *m;
1149         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1150
1151         if (!info->attrs[TIPC_NLA_MEDIA])
1152                 return -EINVAL;
1153
1154         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1155                                info->attrs[TIPC_NLA_MEDIA],
1156                                tipc_nl_media_policy, info->extack);
1157
1158         if (!attrs[TIPC_NLA_MEDIA_NAME])
1159                 return -EINVAL;
1160         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1161
1162         m = tipc_media_find(name);
1163         if (!m)
1164                 return -EINVAL;
1165
1166         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1167                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1168
1169                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1170                                               props);
1171                 if (err)
1172                         return err;
1173
1174                 if (props[TIPC_NLA_PROP_TOL])
1175                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1176                 if (props[TIPC_NLA_PROP_PRIO])
1177                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1178                 if (props[TIPC_NLA_PROP_WIN])
1179                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1180                 if (props[TIPC_NLA_PROP_MTU]) {
1181                         if (m->type_id != TIPC_MEDIA_TYPE_UDP)
1182                                 return -EINVAL;
1183 #ifdef CONFIG_TIPC_MEDIA_UDP
1184                         if (tipc_udp_mtu_bad(nla_get_u32
1185                                              (props[TIPC_NLA_PROP_MTU])))
1186                                 return -EINVAL;
1187                         m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1188 #endif
1189                 }
1190         }
1191
1192         return 0;
1193 }
1194
1195 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1196 {
1197         int err;
1198
1199         rtnl_lock();
1200         err = __tipc_nl_media_set(skb, info);
1201         rtnl_unlock();
1202
1203         return err;
1204 }