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
  46 #define MAX_ADDR_STR 60
  47
  48 static struct tipc_media * const media_info_array[] = {
  49         &eth_media_info,
  50 #ifdef CONFIG_TIPC_MEDIA_IB
  51         &ib_media_info,
  52 #endif
  53 #ifdef CONFIG_TIPC_MEDIA_UDP
  54         &udp_media_info,
  55 #endif
  56         NULL
  57 };
  58
  59 static void bearer_disable(struct net *net, struct tipc_bearer *b);
  60
  61 /**
  62  * tipc_media_find - locates specified media object by name
  63  */
  64 struct tipc_media *tipc_media_find(const char *name)
  65 {
  66         u32 i;
  67
  68         for (i = 0; media_info_array[i] != NULL; i++) {
  69                 if (!strcmp(media_info_array[i]->name, name))
  70                         break;
  71         }
  72         return media_info_array[i];
  73 }
  74
  75 /**
  76  * media_find_id - locates specified media object by type identifier
  77  */
  78 static struct tipc_media *media_find_id(u8 type)
  79 {
  80         u32 i;
  81
  82         for (i = 0; media_info_array[i] != NULL; i++) {
  83                 if (media_info_array[i]->type_id == type)
  84                         break;
  85         }
  86         return media_info_array[i];
  87 }
  88
  89 /**
  90  * tipc_media_addr_printf - record media address in print buffer
  91  */
  92 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
  93 {
  94         char addr_str[MAX_ADDR_STR];
  95         struct tipc_media *m;
  96         int ret;
  97
  98         m = media_find_id(a->media_id);
  99
 100         if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
 101                 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
 102         else {
 103                 u32 i;
 104
 105                 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
 106                 for (i = 0; i < sizeof(a->value); i++)
 107                         ret += scnprintf(buf - ret, len + ret,
 108                                             "-%02x", a->value[i]);
 109         }
 110 }
 111
 112 /**
 113  * bearer_name_validate - validate & (optionally) deconstruct bearer name
 114  * @name: ptr to bearer name string
 115  * @name_parts: ptr to area for bearer name components (or NULL if not needed)
 116  *
 117  * Returns 1 if bearer name is valid, otherwise 0.
 118  */
 119 static int bearer_name_validate(const char *name,
 120                                 struct tipc_bearer_names *name_parts)
 121 {
 122         char name_copy[TIPC_MAX_BEARER_NAME];
 123         char *media_name;
 124         char *if_name;
 125         u32 media_len;
 126         u32 if_len;
 127
 128         /* copy bearer name & ensure length is OK */
 129         name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 130         /* need above in case non-Posix strncpy() doesn't pad with nulls */
 131         strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 132         if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 133                 return 0;
 134
 135         /* ensure all component parts of bearer name are present */
 136         media_name = name_copy;
 137         if_name = strchr(media_name, ':');
 138         if (if_name == NULL)
 139                 return 0;
 140         *(if_name++) = 0;
 141         media_len = if_name - media_name;
 142         if_len = strlen(if_name) + 1;
 143
 144         /* validate component parts of bearer name */
 145         if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 146             (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
 147                 return 0;
 148
 149         /* return bearer name components, if necessary */
 150         if (name_parts) {
 151                 strcpy(name_parts->media_name, media_name);
 152                 strcpy(name_parts->if_name, if_name);
 153         }
 154         return 1;
 155 }
 156
 157 /**
 158  * tipc_bearer_find - locates bearer object with matching bearer name
 159  */
 160 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
 161 {
 162         struct tipc_net *tn = net_generic(net, tipc_net_id);
 163         struct tipc_bearer *b;
 164         u32 i;
 165
 166         for (i = 0; i < MAX_BEARERS; i++) {
 167                 b = rtnl_dereference(tn->bearer_list[i]);
 168                 if (b && (!strcmp(b->name, name)))
 169                         return b;
 170         }
 171         return NULL;
 172 }
 173
 174 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
 175 {
 176         struct tipc_net *tn = net_generic(net, tipc_net_id);
 177         struct tipc_bearer *b;
 178
 179         rcu_read_lock();
 180         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 181         if (b)
 182                 tipc_disc_add_dest(b->link_req);
 183         rcu_read_unlock();
 184 }
 185
 186 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
 187 {
 188         struct tipc_net *tn = net_generic(net, tipc_net_id);
 189         struct tipc_bearer *b;
 190
 191         rcu_read_lock();
 192         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 193         if (b)
 194                 tipc_disc_remove_dest(b->link_req);
 195         rcu_read_unlock();
 196 }
 197
 198 /**
 199  * tipc_enable_bearer - enable bearer with the given name
 200  */
 201 static int tipc_enable_bearer(struct net *net, const char *name,
 202                               u32 disc_domain, u32 priority,
 203                               struct nlattr *attr[])
 204 {
 205         struct tipc_net *tn = net_generic(net, tipc_net_id);
 206         struct tipc_bearer *b;
 207         struct tipc_media *m;
 208         struct tipc_bearer_names b_names;
 209         struct sk_buff *skb;
 210         char addr_string[16];
 211         u32 bearer_id;
 212         u32 with_this_prio;
 213         u32 i;
 214         int res = -EINVAL;
 215
 216         if (!tn->own_addr) {
 217                 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
 218                         name);
 219                 return -ENOPROTOOPT;
 220         }
 221         if (!bearer_name_validate(name, &b_names)) {
 222                 pr_warn("Bearer <%s> rejected, illegal name\n", name);
 223                 return -EINVAL;
 224         }
 225         if (tipc_addr_domain_valid(disc_domain) &&
 226             (disc_domain != tn->own_addr)) {
 227                 if (tipc_in_scope(disc_domain, tn->own_addr)) {
 228                         disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
 229                         res = 0;   /* accept any node in own cluster */
 230                 } else if (in_own_cluster_exact(net, disc_domain))
 231                         res = 0;   /* accept specified node in own cluster */
 232         }
 233         if (res) {
 234                 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
 235                         name);
 236                 return -EINVAL;
 237         }
 238         if ((priority > TIPC_MAX_LINK_PRI) &&
 239             (priority != TIPC_MEDIA_LINK_PRI)) {
 240                 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
 241                 return -EINVAL;
 242         }
 243
 244         m = tipc_media_find(b_names.media_name);
 245         if (!m) {
 246                 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
 247                         name, b_names.media_name);
 248                 return -EINVAL;
 249         }
 250
 251         if (priority == TIPC_MEDIA_LINK_PRI)
 252                 priority = m->priority;
 253
 254 restart:
 255         bearer_id = MAX_BEARERS;
 256         with_this_prio = 1;
 257         for (i = MAX_BEARERS; i-- != 0; ) {
 258                 b = rtnl_dereference(tn->bearer_list[i]);
 259                 if (!b) {
 260                         bearer_id = i;
 261                         continue;
 262                 }
 263                 if (!strcmp(name, b->name)) {
 264                         pr_warn("Bearer <%s> rejected, already enabled\n",
 265                                 name);
 266                         return -EINVAL;
 267                 }
 268                 if ((b->priority == priority) &&
 269                     (++with_this_prio > 2)) {
 270                         if (priority-- == 0) {
 271                                 pr_warn("Bearer <%s> rejected, duplicate priority\n",
 272                                         name);
 273                                 return -EINVAL;
 274                         }
 275                         pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
 276                                 name, priority + 1, priority);
 277                         goto restart;
 278                 }
 279         }
 280         if (bearer_id >= MAX_BEARERS) {
 281                 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 282                         name, MAX_BEARERS);
 283                 return -EINVAL;
 284         }
 285
 286         b = kzalloc(sizeof(*b), GFP_ATOMIC);
 287         if (!b)
 288                 return -ENOMEM;
 289
 290         strcpy(b->name, name);
 291         b->media = m;
 292         res = m->enable_media(net, b, attr);
 293         if (res) {
 294                 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
 295                         name, -res);
 296                 return -EINVAL;
 297         }
 298
 299         b->identity = bearer_id;
 300         b->tolerance = m->tolerance;
 301         b->window = m->window;
 302         b->domain = disc_domain;
 303         b->net_plane = bearer_id + 'A';
 304         b->priority = priority;
 305
 306         res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
 307         if (res) {
 308                 bearer_disable(net, b);
 309                 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
 310                         name);
 311                 return -EINVAL;
 312         }
 313
 314         rcu_assign_pointer(tn->bearer_list[bearer_id], b);
 315         if (skb)
 316                 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
 317
 318         if (tipc_mon_create(net, bearer_id))
 319                 return -ENOMEM;
 320
 321         pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 322                 name,
 323                 tipc_addr_string_fill(addr_string, disc_domain), priority);
 324         return res;
 325 }
 326
 327 /**
 328  * tipc_reset_bearer - Reset all links established over this bearer
 329  */
 330 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
 331 {
 332         pr_info("Resetting bearer <%s>\n", b->name);
 333         tipc_node_delete_links(net, b->identity);
 334         tipc_disc_reset(net, b);
 335         return 0;
 336 }
 337
 338 /* tipc_bearer_reset_all - reset all links on all bearers
 339  */
 340 void tipc_bearer_reset_all(struct net *net)
 341 {
 342         struct tipc_net *tn = tipc_net(net);
 343         struct tipc_bearer *b;
 344         int i;
 345
 346         for (i = 0; i < MAX_BEARERS; i++) {
 347                 b = rcu_dereference_rtnl(tn->bearer_list[i]);
 348                 if (b)
 349                         tipc_reset_bearer(net, b);
 350         }
 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         b->media->disable_media(b);
 365         tipc_node_delete_links(net, bearer_id);
 366         RCU_INIT_POINTER(b->media_ptr, NULL);
 367         if (b->link_req)
 368                 tipc_disc_delete(b->link_req);
 369         RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
 370         kfree_rcu(b, rcu);
 371         tipc_mon_delete(net, bearer_id);
 372 }
 373
 374 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 375                          struct nlattr *attr[])
 376 {
 377         struct net_device *dev;
 378         char *driver_name = strchr((const char *)b->name, ':') + 1;
 379
 380         /* Find device with specified name */
 381         dev = dev_get_by_name(net, driver_name);
 382         if (!dev)
 383                 return -ENODEV;
 384
 385         /* Associate TIPC bearer with L2 bearer */
 386         rcu_assign_pointer(b->media_ptr, dev);
 387         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 388         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 389         b->bcast_addr.media_id = b->media->type_id;
 390         b->bcast_addr.broadcast = 1;
 391         b->mtu = dev->mtu;
 392         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 393         rcu_assign_pointer(dev->tipc_ptr, b);
 394         return 0;
 395 }
 396
 397 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 398  *
 399  * Mark L2 bearer as inactive so that incoming buffers are thrown away
 400  */
 401 void tipc_disable_l2_media(struct tipc_bearer *b)
 402 {
 403         struct net_device *dev;
 404
 405         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 406         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 407         synchronize_net();
 408         dev_put(dev);
 409 }
 410
 411 /**
 412  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 413  * @skb: the packet to be sent
 414  * @b: the bearer through which the packet is to be sent
 415  * @dest: peer destination address
 416  */
 417 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
 418                      struct tipc_bearer *b, struct tipc_media_addr *dest)
 419 {
 420         struct net_device *dev;
 421         int delta;
 422         void *tipc_ptr;
 423
 424         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
 425         if (!dev)
 426                 return 0;
 427
 428         /* Send RESET message even if bearer is detached from device */
 429         tipc_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
 430         if (unlikely(!tipc_ptr && !msg_is_reset(buf_msg(skb))))
 431                 goto drop;
 432
 433         delta = dev->hard_header_len - skb_headroom(skb);
 434         if ((delta > 0) &&
 435             pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC))
 436                 goto drop;
 437
 438         skb_reset_network_header(skb);
 439         skb->dev = dev;
 440         skb->protocol = htons(ETH_P_TIPC);
 441         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
 442                         dev->dev_addr, skb->len);
 443         dev_queue_xmit(skb);
 444         return 0;
 445 drop:
 446         kfree_skb(skb);
 447         return 0;
 448 }
 449
 450 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
 451 {
 452         int mtu = 0;
 453         struct tipc_bearer *b;
 454
 455         rcu_read_lock();
 456         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
 457         if (b)
 458                 mtu = b->mtu;
 459         rcu_read_unlock();
 460         return mtu;
 461 }
 462
 463 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
 464  */
 465 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
 466                           struct sk_buff *skb,
 467                           struct tipc_media_addr *dest)
 468 {
 469         struct tipc_net *tn = tipc_net(net);
 470         struct tipc_bearer *b;
 471
 472         rcu_read_lock();
 473         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 474         if (likely(b))
 475                 b->media->send_msg(net, skb, b, dest);
 476         else
 477                 kfree_skb(skb);
 478         rcu_read_unlock();
 479 }
 480
 481 /* tipc_bearer_xmit() -send buffer to destination over bearer
 482  */
 483 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
 484                       struct sk_buff_head *xmitq,
 485                       struct tipc_media_addr *dst)
 486 {
 487         struct tipc_net *tn = net_generic(net, tipc_net_id);
 488         struct tipc_bearer *b;
 489         struct sk_buff *skb, *tmp;
 490
 491         if (skb_queue_empty(xmitq))
 492                 return;
 493
 494         rcu_read_lock();
 495         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 496         if (unlikely(!b))
 497                 __skb_queue_purge(xmitq);
 498         skb_queue_walk_safe(xmitq, skb, tmp) {
 499                 __skb_dequeue(xmitq);
 500                 b->media->send_msg(net, skb, b, dst);
 501         }
 502         rcu_read_unlock();
 503 }
 504
 505 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
 506  */
 507 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
 508                          struct sk_buff_head *xmitq)
 509 {
 510         struct tipc_net *tn = tipc_net(net);
 511         int net_id = tn->net_id;
 512         struct tipc_bearer *b;
 513         struct sk_buff *skb, *tmp;
 514         struct tipc_msg *hdr;
 515
 516         rcu_read_lock();
 517         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 518         if (unlikely(!b))
 519                 __skb_queue_purge(xmitq);
 520         skb_queue_walk_safe(xmitq, skb, tmp) {
 521                 hdr = buf_msg(skb);
 522                 msg_set_non_seq(hdr, 1);
 523                 msg_set_mc_netid(hdr, net_id);
 524                 __skb_dequeue(xmitq);
 525                 b->media->send_msg(net, skb, b, &b->bcast_addr);
 526         }
 527         rcu_read_unlock();
 528 }
 529
 530 /**
 531  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 532  * @buf: the received packet
 533  * @dev: the net device that the packet was received on
 534  * @pt: the packet_type structure which was used to register this handler
 535  * @orig_dev: the original receive net device in case the device is a bond
 536  *
 537  * Accept only packets explicitly sent to this node, or broadcast packets;
 538  * ignores packets sent using interface multicast, and traffic sent to other
 539  * nodes (which can happen if interface is running in promiscuous mode).
 540  */
 541 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
 542                            struct packet_type *pt, struct net_device *orig_dev)
 543 {
 544         struct tipc_bearer *b;
 545
 546         rcu_read_lock();
 547         b = rcu_dereference_rtnl(dev->tipc_ptr);
 548         if (likely(b && (skb->pkt_type <= PACKET_BROADCAST))) {
 549                 skb->next = NULL;
 550                 tipc_rcv(dev_net(dev), skb, b);
 551                 rcu_read_unlock();
 552                 return NET_RX_SUCCESS;
 553         }
 554         rcu_read_unlock();
 555         kfree_skb(skb);
 556         return NET_RX_DROP;
 557 }
 558
 559 /**
 560  * tipc_l2_device_event - handle device events from network device
 561  * @nb: the context of the notification
 562  * @evt: the type of event
 563  * @ptr: the net device that the event was on
 564  *
 565  * This function is called by the Ethernet driver in case of link
 566  * change event.
 567  */
 568 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 569                                 void *ptr)
 570 {
 571         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 572         struct net *net = dev_net(dev);
 573         struct tipc_net *tn = tipc_net(net);
 574         struct tipc_bearer *b;
 575         int i;
 576
 577         b = rtnl_dereference(dev->tipc_ptr);
 578         if (!b) {
 579                 for (i = 0; i < MAX_BEARERS; b = NULL, i++) {
 580                         b = rtnl_dereference(tn->bearer_list[i]);
 581                         if (b && (b->media_ptr == dev))
 582                                 break;
 583                 }
 584         }
 585         if (!b)
 586                 return NOTIFY_DONE;
 587
 588         b->mtu = dev->mtu;
 589
 590         switch (evt) {
 591         case NETDEV_CHANGE:
 592                 if (netif_carrier_ok(dev))
 593                         break;
 594         case NETDEV_UP:
 595                 rcu_assign_pointer(dev->tipc_ptr, b);
 596                 break;
 597         case NETDEV_GOING_DOWN:
 598                 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 599                 synchronize_net();
 600                 tipc_reset_bearer(net, b);
 601                 break;
 602         case NETDEV_CHANGEMTU:
 603                 tipc_reset_bearer(net, b);
 604                 break;
 605         case NETDEV_CHANGEADDR:
 606                 b->media->raw2addr(b, &b->addr,
 607                                    (char *)dev->dev_addr);
 608                 tipc_reset_bearer(net, b);
 609                 break;
 610         case NETDEV_UNREGISTER:
 611         case NETDEV_CHANGENAME:
 612                 bearer_disable(dev_net(dev), b);
 613                 break;
 614         }
 615         return NOTIFY_OK;
 616 }
 617
 618 static struct packet_type tipc_packet_type __read_mostly = {
 619         .type = htons(ETH_P_TIPC),
 620         .func = tipc_l2_rcv_msg,
 621 };
 622
 623 static struct notifier_block notifier = {
 624         .notifier_call  = tipc_l2_device_event,
 625         .priority       = 0,
 626 };
 627
 628 int tipc_bearer_setup(void)
 629 {
 630         int err;
 631
 632         err = register_netdevice_notifier(&notifier);
 633         if (err)
 634                 return err;
 635         dev_add_pack(&tipc_packet_type);
 636         return 0;
 637 }
 638
 639 void tipc_bearer_cleanup(void)
 640 {
 641         unregister_netdevice_notifier(&notifier);
 642         dev_remove_pack(&tipc_packet_type);
 643 }
 644
 645 void tipc_bearer_stop(struct net *net)
 646 {
 647         struct tipc_net *tn = net_generic(net, tipc_net_id);
 648         struct tipc_bearer *b;
 649         u32 i;
 650
 651         for (i = 0; i < MAX_BEARERS; i++) {
 652                 b = rtnl_dereference(tn->bearer_list[i]);
 653                 if (b) {
 654                         bearer_disable(net, b);
 655                         tn->bearer_list[i] = NULL;
 656                 }
 657         }
 658 }
 659
 660 /* Caller should hold rtnl_lock to protect the bearer */
 661 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 662                                 struct tipc_bearer *bearer, int nlflags)
 663 {
 664         void *hdr;
 665         struct nlattr *attrs;
 666         struct nlattr *prop;
 667
 668         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 669                           nlflags, TIPC_NL_BEARER_GET);
 670         if (!hdr)
 671                 return -EMSGSIZE;
 672
 673         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
 674         if (!attrs)
 675                 goto msg_full;
 676
 677         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 678                 goto attr_msg_full;
 679
 680         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
 681         if (!prop)
 682                 goto prop_msg_full;
 683         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 684                 goto prop_msg_full;
 685         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 686                 goto prop_msg_full;
 687         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 688                 goto prop_msg_full;
 689
 690         nla_nest_end(msg->skb, prop);
 691         nla_nest_end(msg->skb, attrs);
 692         genlmsg_end(msg->skb, hdr);
 693
 694         return 0;
 695
 696 prop_msg_full:
 697         nla_nest_cancel(msg->skb, prop);
 698 attr_msg_full:
 699         nla_nest_cancel(msg->skb, attrs);
 700 msg_full:
 701         genlmsg_cancel(msg->skb, hdr);
 702
 703         return -EMSGSIZE;
 704 }
 705
 706 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 707 {
 708         int err;
 709         int i = cb->args[0];
 710         struct tipc_bearer *bearer;
 711         struct tipc_nl_msg msg;
 712         struct net *net = sock_net(skb->sk);
 713         struct tipc_net *tn = net_generic(net, tipc_net_id);
 714
 715         if (i == MAX_BEARERS)
 716                 return 0;
 717
 718         msg.skb = skb;
 719         msg.portid = NETLINK_CB(cb->skb).portid;
 720         msg.seq = cb->nlh->nlmsg_seq;
 721
 722         rtnl_lock();
 723         for (i = 0; i < MAX_BEARERS; i++) {
 724                 bearer = rtnl_dereference(tn->bearer_list[i]);
 725                 if (!bearer)
 726                         continue;
 727
 728                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
 729                 if (err)
 730                         break;
 731         }
 732         rtnl_unlock();
 733
 734         cb->args[0] = i;
 735         return skb->len;
 736 }
 737
 738 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 739 {
 740         int err;
 741         char *name;
 742         struct sk_buff *rep;
 743         struct tipc_bearer *bearer;
 744         struct tipc_nl_msg msg;
 745         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 746         struct net *net = genl_info_net(info);
 747
 748         if (!info->attrs[TIPC_NLA_BEARER])
 749                 return -EINVAL;
 750
 751         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 752                                info->attrs[TIPC_NLA_BEARER],
 753                                tipc_nl_bearer_policy);
 754         if (err)
 755                 return err;
 756
 757         if (!attrs[TIPC_NLA_BEARER_NAME])
 758                 return -EINVAL;
 759         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 760
 761         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 762         if (!rep)
 763                 return -ENOMEM;
 764
 765         msg.skb = rep;
 766         msg.portid = info->snd_portid;
 767         msg.seq = info->snd_seq;
 768
 769         rtnl_lock();
 770         bearer = tipc_bearer_find(net, name);
 771         if (!bearer) {
 772                 err = -EINVAL;
 773                 goto err_out;
 774         }
 775
 776         err = __tipc_nl_add_bearer(&msg, bearer, 0);
 777         if (err)
 778                 goto err_out;
 779         rtnl_unlock();
 780
 781         return genlmsg_reply(rep, info);
 782 err_out:
 783         rtnl_unlock();
 784         nlmsg_free(rep);
 785
 786         return err;
 787 }
 788
 789 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 790 {
 791         int err;
 792         char *name;
 793         struct tipc_bearer *bearer;
 794         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 795         struct net *net = sock_net(skb->sk);
 796
 797         if (!info->attrs[TIPC_NLA_BEARER])
 798                 return -EINVAL;
 799
 800         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 801                                info->attrs[TIPC_NLA_BEARER],
 802                                tipc_nl_bearer_policy);
 803         if (err)
 804                 return err;
 805
 806         if (!attrs[TIPC_NLA_BEARER_NAME])
 807                 return -EINVAL;
 808
 809         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 810
 811         rtnl_lock();
 812         bearer = tipc_bearer_find(net, name);
 813         if (!bearer) {
 814                 rtnl_unlock();
 815                 return -EINVAL;
 816         }
 817
 818         bearer_disable(net, bearer);
 819         rtnl_unlock();
 820
 821         return 0;
 822 }
 823
 824 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 825 {
 826         int err;
 827         char *bearer;
 828         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 829         struct net *net = sock_net(skb->sk);
 830         struct tipc_net *tn = net_generic(net, tipc_net_id);
 831         u32 domain;
 832         u32 prio;
 833
 834         prio = TIPC_MEDIA_LINK_PRI;
 835         domain = tn->own_addr & TIPC_CLUSTER_MASK;
 836
 837         if (!info->attrs[TIPC_NLA_BEARER])
 838                 return -EINVAL;
 839
 840         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 841                                info->attrs[TIPC_NLA_BEARER],
 842                                tipc_nl_bearer_policy);
 843         if (err)
 844                 return err;
 845
 846         if (!attrs[TIPC_NLA_BEARER_NAME])
 847                 return -EINVAL;
 848
 849         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 850
 851         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 852                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 853
 854         if (attrs[TIPC_NLA_BEARER_PROP]) {
 855                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 856
 857                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 858                                               props);
 859                 if (err)
 860                         return err;
 861
 862                 if (props[TIPC_NLA_PROP_PRIO])
 863                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 864         }
 865
 866         rtnl_lock();
 867         err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
 868         if (err) {
 869                 rtnl_unlock();
 870                 return err;
 871         }
 872         rtnl_unlock();
 873
 874         return 0;
 875 }
 876
 877 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 878 {
 879         int err;
 880         char *name;
 881         struct tipc_bearer *b;
 882         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 883         struct net *net = sock_net(skb->sk);
 884
 885         if (!info->attrs[TIPC_NLA_BEARER])
 886                 return -EINVAL;
 887
 888         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 889                                info->attrs[TIPC_NLA_BEARER],
 890                                tipc_nl_bearer_policy);
 891         if (err)
 892                 return err;
 893
 894         if (!attrs[TIPC_NLA_BEARER_NAME])
 895                 return -EINVAL;
 896         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 897
 898         rtnl_lock();
 899         b = tipc_bearer_find(net, name);
 900         if (!b) {
 901                 rtnl_unlock();
 902                 return -EINVAL;
 903         }
 904
 905         if (attrs[TIPC_NLA_BEARER_PROP]) {
 906                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 907
 908                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 909                                               props);
 910                 if (err) {
 911                         rtnl_unlock();
 912                         return err;
 913                 }
 914
 915                 if (props[TIPC_NLA_PROP_TOL])
 916                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
 917                 if (props[TIPC_NLA_PROP_PRIO])
 918                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 919                 if (props[TIPC_NLA_PROP_WIN])
 920                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
 921         }
 922         rtnl_unlock();
 923
 924         return 0;
 925 }
 926
 927 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
 928                                struct tipc_media *media, int nlflags)
 929 {
 930         void *hdr;
 931         struct nlattr *attrs;
 932         struct nlattr *prop;
 933
 934         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 935                           nlflags, TIPC_NL_MEDIA_GET);
 936         if (!hdr)
 937                 return -EMSGSIZE;
 938
 939         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
 940         if (!attrs)
 941                 goto msg_full;
 942
 943         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
 944                 goto attr_msg_full;
 945
 946         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
 947         if (!prop)
 948                 goto prop_msg_full;
 949         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
 950                 goto prop_msg_full;
 951         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
 952                 goto prop_msg_full;
 953         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
 954                 goto prop_msg_full;
 955
 956         nla_nest_end(msg->skb, prop);
 957         nla_nest_end(msg->skb, attrs);
 958         genlmsg_end(msg->skb, hdr);
 959
 960         return 0;
 961
 962 prop_msg_full:
 963         nla_nest_cancel(msg->skb, prop);
 964 attr_msg_full:
 965         nla_nest_cancel(msg->skb, attrs);
 966 msg_full:
 967         genlmsg_cancel(msg->skb, hdr);
 968
 969         return -EMSGSIZE;
 970 }
 971
 972 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
 973 {
 974         int err;
 975         int i = cb->args[0];
 976         struct tipc_nl_msg msg;
 977
 978         if (i == MAX_MEDIA)
 979                 return 0;
 980
 981         msg.skb = skb;
 982         msg.portid = NETLINK_CB(cb->skb).portid;
 983         msg.seq = cb->nlh->nlmsg_seq;
 984
 985         rtnl_lock();
 986         for (; media_info_array[i] != NULL; i++) {
 987                 err = __tipc_nl_add_media(&msg, media_info_array[i],
 988                                           NLM_F_MULTI);
 989                 if (err)
 990                         break;
 991         }
 992         rtnl_unlock();
 993
 994         cb->args[0] = i;
 995         return skb->len;
 996 }
 997
 998 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 999 {
1000         int err;
1001         char *name;
1002         struct tipc_nl_msg msg;
1003         struct tipc_media *media;
1004         struct sk_buff *rep;
1005         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1006
1007         if (!info->attrs[TIPC_NLA_MEDIA])
1008                 return -EINVAL;
1009
1010         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1011                                info->attrs[TIPC_NLA_MEDIA],
1012                                tipc_nl_media_policy);
1013         if (err)
1014                 return err;
1015
1016         if (!attrs[TIPC_NLA_MEDIA_NAME])
1017                 return -EINVAL;
1018         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1019
1020         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1021         if (!rep)
1022                 return -ENOMEM;
1023
1024         msg.skb = rep;
1025         msg.portid = info->snd_portid;
1026         msg.seq = info->snd_seq;
1027
1028         rtnl_lock();
1029         media = tipc_media_find(name);
1030         if (!media) {
1031                 err = -EINVAL;
1032                 goto err_out;
1033         }
1034
1035         err = __tipc_nl_add_media(&msg, media, 0);
1036         if (err)
1037                 goto err_out;
1038         rtnl_unlock();
1039
1040         return genlmsg_reply(rep, info);
1041 err_out:
1042         rtnl_unlock();
1043         nlmsg_free(rep);
1044
1045         return err;
1046 }
1047
1048 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1049 {
1050         int err;
1051         char *name;
1052         struct tipc_media *m;
1053         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1054
1055         if (!info->attrs[TIPC_NLA_MEDIA])
1056                 return -EINVAL;
1057
1058         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1059                                info->attrs[TIPC_NLA_MEDIA],
1060                                tipc_nl_media_policy);
1061
1062         if (!attrs[TIPC_NLA_MEDIA_NAME])
1063                 return -EINVAL;
1064         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1065
1066         rtnl_lock();
1067         m = tipc_media_find(name);
1068         if (!m) {
1069                 rtnl_unlock();
1070                 return -EINVAL;
1071         }
1072
1073         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1074                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1075
1076                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1077                                               props);
1078                 if (err) {
1079                         rtnl_unlock();
1080                         return err;
1081                 }
1082
1083                 if (props[TIPC_NLA_PROP_TOL])
1084                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1085                 if (props[TIPC_NLA_PROP_PRIO])
1086                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1087                 if (props[TIPC_NLA_PROP_WIN])
1088                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1089         }
1090         rtnl_unlock();
1091
1092         return 0;
1093 }