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 "config.h"
  40 #include "bearer.h"
  41 #include "link.h"
  42 #include "discover.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         NULL
  52 };
  53
  54 static const struct nla_policy
  55 tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1]  = {
  56         [TIPC_NLA_BEARER_UNSPEC]                = { .type = NLA_UNSPEC },
  57         [TIPC_NLA_BEARER_NAME] = {
  58                 .type = NLA_STRING,
  59                 .len = TIPC_MAX_BEARER_NAME
  60         },
  61         [TIPC_NLA_BEARER_PROP]                  = { .type = NLA_NESTED },
  62         [TIPC_NLA_BEARER_DOMAIN]                = { .type = NLA_U32 }
  63 };
  64
  65 static const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
  66         [TIPC_NLA_MEDIA_UNSPEC]         = { .type = NLA_UNSPEC },
  67         [TIPC_NLA_MEDIA_NAME]           = { .type = NLA_STRING },
  68         [TIPC_NLA_MEDIA_PROP]           = { .type = NLA_NESTED }
  69 };
  70
  71 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
  72                            bool shutting_down);
  73
  74 /**
  75  * tipc_media_find - locates specified media object by name
  76  */
  77 struct tipc_media *tipc_media_find(const char *name)
  78 {
  79         u32 i;
  80
  81         for (i = 0; media_info_array[i] != NULL; i++) {
  82                 if (!strcmp(media_info_array[i]->name, name))
  83                         break;
  84         }
  85         return media_info_array[i];
  86 }
  87
  88 /**
  89  * media_find_id - locates specified media object by type identifier
  90  */
  91 static struct tipc_media *media_find_id(u8 type)
  92 {
  93         u32 i;
  94
  95         for (i = 0; media_info_array[i] != NULL; i++) {
  96                 if (media_info_array[i]->type_id == type)
  97                         break;
  98         }
  99         return media_info_array[i];
 100 }
 101
 102 /**
 103  * tipc_media_addr_printf - record media address in print buffer
 104  */
 105 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
 106 {
 107         char addr_str[MAX_ADDR_STR];
 108         struct tipc_media *m_ptr;
 109         int ret;
 110
 111         m_ptr = media_find_id(a->media_id);
 112
 113         if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
 114                 ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
 115         else {
 116                 u32 i;
 117
 118                 ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id);
 119                 for (i = 0; i < sizeof(a->value); i++)
 120                         ret += tipc_snprintf(buf - ret, len + ret,
 121                                             "-%02x", a->value[i]);
 122         }
 123 }
 124
 125 /**
 126  * tipc_media_get_names - record names of registered media in buffer
 127  */
 128 struct sk_buff *tipc_media_get_names(void)
 129 {
 130         struct sk_buff *buf;
 131         int i;
 132
 133         buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
 134         if (!buf)
 135                 return NULL;
 136
 137         for (i = 0; media_info_array[i] != NULL; i++) {
 138                 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
 139                                     media_info_array[i]->name,
 140                                     strlen(media_info_array[i]->name) + 1);
 141         }
 142         return buf;
 143 }
 144
 145 /**
 146  * bearer_name_validate - validate & (optionally) deconstruct bearer name
 147  * @name: ptr to bearer name string
 148  * @name_parts: ptr to area for bearer name components (or NULL if not needed)
 149  *
 150  * Returns 1 if bearer name is valid, otherwise 0.
 151  */
 152 static int bearer_name_validate(const char *name,
 153                                 struct tipc_bearer_names *name_parts)
 154 {
 155         char name_copy[TIPC_MAX_BEARER_NAME];
 156         char *media_name;
 157         char *if_name;
 158         u32 media_len;
 159         u32 if_len;
 160
 161         /* copy bearer name & ensure length is OK */
 162         name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 163         /* need above in case non-Posix strncpy() doesn't pad with nulls */
 164         strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 165         if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 166                 return 0;
 167
 168         /* ensure all component parts of bearer name are present */
 169         media_name = name_copy;
 170         if_name = strchr(media_name, ':');
 171         if (if_name == NULL)
 172                 return 0;
 173         *(if_name++) = 0;
 174         media_len = if_name - media_name;
 175         if_len = strlen(if_name) + 1;
 176
 177         /* validate component parts of bearer name */
 178         if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 179             (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
 180                 return 0;
 181
 182         /* return bearer name components, if necessary */
 183         if (name_parts) {
 184                 strcpy(name_parts->media_name, media_name);
 185                 strcpy(name_parts->if_name, if_name);
 186         }
 187         return 1;
 188 }
 189
 190 /**
 191  * tipc_bearer_find - locates bearer object with matching bearer name
 192  */
 193 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
 194 {
 195         struct tipc_net *tn = net_generic(net, tipc_net_id);
 196         struct tipc_bearer *b_ptr;
 197         u32 i;
 198
 199         for (i = 0; i < MAX_BEARERS; i++) {
 200                 b_ptr = rtnl_dereference(tn->bearer_list[i]);
 201                 if (b_ptr && (!strcmp(b_ptr->name, name)))
 202                         return b_ptr;
 203         }
 204         return NULL;
 205 }
 206
 207 /**
 208  * tipc_bearer_get_names - record names of bearers in buffer
 209  */
 210 struct sk_buff *tipc_bearer_get_names(struct net *net)
 211 {
 212         struct tipc_net *tn = net_generic(net, tipc_net_id);
 213         struct sk_buff *buf;
 214         struct tipc_bearer *b;
 215         int i, j;
 216
 217         buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
 218         if (!buf)
 219                 return NULL;
 220
 221         for (i = 0; media_info_array[i] != NULL; i++) {
 222                 for (j = 0; j < MAX_BEARERS; j++) {
 223                         b = rtnl_dereference(tn->bearer_list[j]);
 224                         if (!b)
 225                                 continue;
 226                         if (b->media == media_info_array[i]) {
 227                                 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
 228                                                     b->name,
 229                                                     strlen(b->name) + 1);
 230                         }
 231                 }
 232         }
 233         return buf;
 234 }
 235
 236 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
 237 {
 238         struct tipc_net *tn = net_generic(net, tipc_net_id);
 239         struct tipc_bearer *b_ptr;
 240
 241         rcu_read_lock();
 242         b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 243         if (b_ptr) {
 244                 tipc_bcbearer_sort(net, &b_ptr->nodes, dest, true);
 245                 tipc_disc_add_dest(b_ptr->link_req);
 246         }
 247         rcu_read_unlock();
 248 }
 249
 250 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
 251 {
 252         struct tipc_net *tn = net_generic(net, tipc_net_id);
 253         struct tipc_bearer *b_ptr;
 254
 255         rcu_read_lock();
 256         b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 257         if (b_ptr) {
 258                 tipc_bcbearer_sort(net, &b_ptr->nodes, dest, false);
 259                 tipc_disc_remove_dest(b_ptr->link_req);
 260         }
 261         rcu_read_unlock();
 262 }
 263
 264 /**
 265  * tipc_enable_bearer - enable bearer with the given name
 266  */
 267 int tipc_enable_bearer(struct net *net, const char *name, u32 disc_domain,
 268                        u32 priority)
 269 {
 270         struct tipc_net *tn = net_generic(net, tipc_net_id);
 271         struct tipc_bearer *b_ptr;
 272         struct tipc_media *m_ptr;
 273         struct tipc_bearer_names b_names;
 274         char addr_string[16];
 275         u32 bearer_id;
 276         u32 with_this_prio;
 277         u32 i;
 278         int res = -EINVAL;
 279
 280         if (!tipc_own_addr) {
 281                 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
 282                         name);
 283                 return -ENOPROTOOPT;
 284         }
 285         if (!bearer_name_validate(name, &b_names)) {
 286                 pr_warn("Bearer <%s> rejected, illegal name\n", name);
 287                 return -EINVAL;
 288         }
 289         if (tipc_addr_domain_valid(disc_domain) &&
 290             (disc_domain != tipc_own_addr)) {
 291                 if (tipc_in_scope(disc_domain, tipc_own_addr)) {
 292                         disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
 293                         res = 0;   /* accept any node in own cluster */
 294                 } else if (in_own_cluster_exact(disc_domain))
 295                         res = 0;   /* accept specified node in own cluster */
 296         }
 297         if (res) {
 298                 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
 299                         name);
 300                 return -EINVAL;
 301         }
 302         if ((priority > TIPC_MAX_LINK_PRI) &&
 303             (priority != TIPC_MEDIA_LINK_PRI)) {
 304                 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
 305                 return -EINVAL;
 306         }
 307
 308         m_ptr = tipc_media_find(b_names.media_name);
 309         if (!m_ptr) {
 310                 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
 311                         name, b_names.media_name);
 312                 return -EINVAL;
 313         }
 314
 315         if (priority == TIPC_MEDIA_LINK_PRI)
 316                 priority = m_ptr->priority;
 317
 318 restart:
 319         bearer_id = MAX_BEARERS;
 320         with_this_prio = 1;
 321         for (i = MAX_BEARERS; i-- != 0; ) {
 322                 b_ptr = rtnl_dereference(tn->bearer_list[i]);
 323                 if (!b_ptr) {
 324                         bearer_id = i;
 325                         continue;
 326                 }
 327                 if (!strcmp(name, b_ptr->name)) {
 328                         pr_warn("Bearer <%s> rejected, already enabled\n",
 329                                 name);
 330                         return -EINVAL;
 331                 }
 332                 if ((b_ptr->priority == priority) &&
 333                     (++with_this_prio > 2)) {
 334                         if (priority-- == 0) {
 335                                 pr_warn("Bearer <%s> rejected, duplicate priority\n",
 336                                         name);
 337                                 return -EINVAL;
 338                         }
 339                         pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
 340                                 name, priority + 1, priority);
 341                         goto restart;
 342                 }
 343         }
 344         if (bearer_id >= MAX_BEARERS) {
 345                 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 346                         name, MAX_BEARERS);
 347                 return -EINVAL;
 348         }
 349
 350         b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
 351         if (!b_ptr)
 352                 return -ENOMEM;
 353
 354         strcpy(b_ptr->name, name);
 355         b_ptr->media = m_ptr;
 356         res = m_ptr->enable_media(net, b_ptr);
 357         if (res) {
 358                 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
 359                         name, -res);
 360                 return -EINVAL;
 361         }
 362
 363         b_ptr->identity = bearer_id;
 364         b_ptr->tolerance = m_ptr->tolerance;
 365         b_ptr->window = m_ptr->window;
 366         b_ptr->domain = disc_domain;
 367         b_ptr->net_plane = bearer_id + 'A';
 368         b_ptr->priority = priority;
 369
 370         res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr);
 371         if (res) {
 372                 bearer_disable(net, b_ptr, false);
 373                 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
 374                         name);
 375                 return -EINVAL;
 376         }
 377
 378         rcu_assign_pointer(tn->bearer_list[bearer_id], b_ptr);
 379
 380         pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 381                 name,
 382                 tipc_addr_string_fill(addr_string, disc_domain), priority);
 383         return res;
 384 }
 385
 386 /**
 387  * tipc_reset_bearer - Reset all links established over this bearer
 388  */
 389 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr)
 390 {
 391         pr_info("Resetting bearer <%s>\n", b_ptr->name);
 392         tipc_link_reset_list(net, b_ptr->identity);
 393         tipc_disc_reset(net, b_ptr);
 394         return 0;
 395 }
 396
 397 /**
 398  * bearer_disable
 399  *
 400  * Note: This routine assumes caller holds RTNL lock.
 401  */
 402 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
 403                            bool shutting_down)
 404 {
 405         struct tipc_net *tn = net_generic(net, tipc_net_id);
 406         u32 i;
 407
 408         pr_info("Disabling bearer <%s>\n", b_ptr->name);
 409         b_ptr->media->disable_media(b_ptr);
 410
 411         tipc_link_delete_list(net, b_ptr->identity, shutting_down);
 412         if (b_ptr->link_req)
 413                 tipc_disc_delete(b_ptr->link_req);
 414
 415         for (i = 0; i < MAX_BEARERS; i++) {
 416                 if (b_ptr == rtnl_dereference(tn->bearer_list[i])) {
 417                         RCU_INIT_POINTER(tn->bearer_list[i], NULL);
 418                         break;
 419                 }
 420         }
 421         kfree_rcu(b_ptr, rcu);
 422 }
 423
 424 int tipc_disable_bearer(struct net *net, const char *name)
 425 {
 426         struct tipc_bearer *b_ptr;
 427         int res;
 428
 429         b_ptr = tipc_bearer_find(net, name);
 430         if (b_ptr == NULL) {
 431                 pr_warn("Attempt to disable unknown bearer <%s>\n", name);
 432                 res = -EINVAL;
 433         } else {
 434                 bearer_disable(net, b_ptr, false);
 435                 res = 0;
 436         }
 437         return res;
 438 }
 439
 440 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b)
 441 {
 442         struct net_device *dev;
 443         char *driver_name = strchr((const char *)b->name, ':') + 1;
 444
 445         /* Find device with specified name */
 446         dev = dev_get_by_name(net, driver_name);
 447         if (!dev)
 448                 return -ENODEV;
 449
 450         /* Associate TIPC bearer with L2 bearer */
 451         rcu_assign_pointer(b->media_ptr, dev);
 452         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 453         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 454         b->bcast_addr.media_id = b->media->type_id;
 455         b->bcast_addr.broadcast = 1;
 456         b->mtu = dev->mtu;
 457         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 458         rcu_assign_pointer(dev->tipc_ptr, b);
 459         return 0;
 460 }
 461
 462 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 463  *
 464  * Mark L2 bearer as inactive so that incoming buffers are thrown away,
 465  * then get worker thread to complete bearer cleanup.  (Can't do cleanup
 466  * here because cleanup code needs to sleep and caller holds spinlocks.)
 467  */
 468 void tipc_disable_l2_media(struct tipc_bearer *b)
 469 {
 470         struct net_device *dev;
 471
 472         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 473         RCU_INIT_POINTER(b->media_ptr, NULL);
 474         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 475         synchronize_net();
 476         dev_put(dev);
 477 }
 478
 479 /**
 480  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 481  * @buf: the packet to be sent
 482  * @b_ptr: the bearer through which the packet is to be sent
 483  * @dest: peer destination address
 484  */
 485 int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b,
 486                      struct tipc_media_addr *dest)
 487 {
 488         struct sk_buff *clone;
 489         struct net_device *dev;
 490         int delta;
 491
 492         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
 493         if (!dev)
 494                 return 0;
 495
 496         clone = skb_clone(buf, GFP_ATOMIC);
 497         if (!clone)
 498                 return 0;
 499
 500         delta = dev->hard_header_len - skb_headroom(buf);
 501         if ((delta > 0) &&
 502             pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
 503                 kfree_skb(clone);
 504                 return 0;
 505         }
 506
 507         skb_reset_network_header(clone);
 508         clone->dev = dev;
 509         clone->protocol = htons(ETH_P_TIPC);
 510         dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
 511                         dev->dev_addr, clone->len);
 512         dev_queue_xmit(clone);
 513         return 0;
 514 }
 515
 516 /* tipc_bearer_send- sends buffer to destination over bearer
 517  *
 518  * IMPORTANT:
 519  * The media send routine must not alter the buffer being passed in
 520  * as it may be needed for later retransmission!
 521  */
 522 void tipc_bearer_send(struct net *net, u32 bearer_id, struct sk_buff *buf,
 523                       struct tipc_media_addr *dest)
 524 {
 525         struct tipc_net *tn = net_generic(net, tipc_net_id);
 526         struct tipc_bearer *b_ptr;
 527
 528         rcu_read_lock();
 529         b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 530         if (likely(b_ptr))
 531                 b_ptr->media->send_msg(buf, b_ptr, dest);
 532         rcu_read_unlock();
 533 }
 534
 535 /**
 536  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 537  * @buf: the received packet
 538  * @dev: the net device that the packet was received on
 539  * @pt: the packet_type structure which was used to register this handler
 540  * @orig_dev: the original receive net device in case the device is a bond
 541  *
 542  * Accept only packets explicitly sent to this node, or broadcast packets;
 543  * ignores packets sent using interface multicast, and traffic sent to other
 544  * nodes (which can happen if interface is running in promiscuous mode).
 545  */
 546 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
 547                            struct packet_type *pt, struct net_device *orig_dev)
 548 {
 549         struct tipc_bearer *b_ptr;
 550
 551         rcu_read_lock();
 552         b_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
 553         if (likely(b_ptr)) {
 554                 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
 555                         buf->next = NULL;
 556                         tipc_rcv(dev_net(dev), buf, b_ptr);
 557                         rcu_read_unlock();
 558                         return NET_RX_SUCCESS;
 559                 }
 560         }
 561         rcu_read_unlock();
 562
 563         kfree_skb(buf);
 564         return NET_RX_DROP;
 565 }
 566
 567 /**
 568  * tipc_l2_device_event - handle device events from network device
 569  * @nb: the context of the notification
 570  * @evt: the type of event
 571  * @ptr: the net device that the event was on
 572  *
 573  * This function is called by the Ethernet driver in case of link
 574  * change event.
 575  */
 576 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 577                                 void *ptr)
 578 {
 579         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 580         struct net *net = dev_net(dev);
 581         struct tipc_bearer *b_ptr;
 582
 583         b_ptr = rtnl_dereference(dev->tipc_ptr);
 584         if (!b_ptr)
 585                 return NOTIFY_DONE;
 586
 587         b_ptr->mtu = dev->mtu;
 588
 589         switch (evt) {
 590         case NETDEV_CHANGE:
 591                 if (netif_carrier_ok(dev))
 592                         break;
 593         case NETDEV_DOWN:
 594         case NETDEV_CHANGEMTU:
 595                 tipc_reset_bearer(net, b_ptr);
 596                 break;
 597         case NETDEV_CHANGEADDR:
 598                 b_ptr->media->raw2addr(b_ptr, &b_ptr->addr,
 599                                        (char *)dev->dev_addr);
 600                 tipc_reset_bearer(net, b_ptr);
 601                 break;
 602         case NETDEV_UNREGISTER:
 603         case NETDEV_CHANGENAME:
 604                 bearer_disable(dev_net(dev), b_ptr, false);
 605                 break;
 606         }
 607         return NOTIFY_OK;
 608 }
 609
 610 static struct packet_type tipc_packet_type __read_mostly = {
 611         .type = htons(ETH_P_TIPC),
 612         .func = tipc_l2_rcv_msg,
 613 };
 614
 615 static struct notifier_block notifier = {
 616         .notifier_call  = tipc_l2_device_event,
 617         .priority       = 0,
 618 };
 619
 620 int tipc_bearer_setup(void)
 621 {
 622         int err;
 623
 624         err = register_netdevice_notifier(&notifier);
 625         if (err)
 626                 return err;
 627         dev_add_pack(&tipc_packet_type);
 628         return 0;
 629 }
 630
 631 void tipc_bearer_cleanup(void)
 632 {
 633         unregister_netdevice_notifier(&notifier);
 634         dev_remove_pack(&tipc_packet_type);
 635 }
 636
 637 void tipc_bearer_stop(struct net *net)
 638 {
 639         struct tipc_net *tn = net_generic(net, tipc_net_id);
 640         struct tipc_bearer *b_ptr;
 641         u32 i;
 642
 643         for (i = 0; i < MAX_BEARERS; i++) {
 644                 b_ptr = rtnl_dereference(tn->bearer_list[i]);
 645                 if (b_ptr) {
 646                         bearer_disable(net, b_ptr, true);
 647                         tn->bearer_list[i] = NULL;
 648                 }
 649         }
 650 }
 651
 652 /* Caller should hold rtnl_lock to protect the bearer */
 653 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 654                                 struct tipc_bearer *bearer)
 655 {
 656         void *hdr;
 657         struct nlattr *attrs;
 658         struct nlattr *prop;
 659
 660         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family,
 661                           NLM_F_MULTI, TIPC_NL_BEARER_GET);
 662         if (!hdr)
 663                 return -EMSGSIZE;
 664
 665         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
 666         if (!attrs)
 667                 goto msg_full;
 668
 669         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 670                 goto attr_msg_full;
 671
 672         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
 673         if (!prop)
 674                 goto prop_msg_full;
 675         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 676                 goto prop_msg_full;
 677         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 678                 goto prop_msg_full;
 679         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 680                 goto prop_msg_full;
 681
 682         nla_nest_end(msg->skb, prop);
 683         nla_nest_end(msg->skb, attrs);
 684         genlmsg_end(msg->skb, hdr);
 685
 686         return 0;
 687
 688 prop_msg_full:
 689         nla_nest_cancel(msg->skb, prop);
 690 attr_msg_full:
 691         nla_nest_cancel(msg->skb, attrs);
 692 msg_full:
 693         genlmsg_cancel(msg->skb, hdr);
 694
 695         return -EMSGSIZE;
 696 }
 697
 698 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 699 {
 700         int err;
 701         int i = cb->args[0];
 702         struct tipc_bearer *bearer;
 703         struct tipc_nl_msg msg;
 704         struct net *net = sock_net(skb->sk);
 705         struct tipc_net *tn = net_generic(net, tipc_net_id);
 706
 707         if (i == MAX_BEARERS)
 708                 return 0;
 709
 710         msg.skb = skb;
 711         msg.portid = NETLINK_CB(cb->skb).portid;
 712         msg.seq = cb->nlh->nlmsg_seq;
 713
 714         rtnl_lock();
 715         for (i = 0; i < MAX_BEARERS; i++) {
 716                 bearer = rtnl_dereference(tn->bearer_list[i]);
 717                 if (!bearer)
 718                         continue;
 719
 720                 err = __tipc_nl_add_bearer(&msg, bearer);
 721                 if (err)
 722                         break;
 723         }
 724         rtnl_unlock();
 725
 726         cb->args[0] = i;
 727         return skb->len;
 728 }
 729
 730 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 731 {
 732         int err;
 733         char *name;
 734         struct sk_buff *rep;
 735         struct tipc_bearer *bearer;
 736         struct tipc_nl_msg msg;
 737         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 738         struct net *net = genl_info_net(info);
 739
 740         if (!info->attrs[TIPC_NLA_BEARER])
 741                 return -EINVAL;
 742
 743         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 744                                info->attrs[TIPC_NLA_BEARER],
 745                                tipc_nl_bearer_policy);
 746         if (err)
 747                 return err;
 748
 749         if (!attrs[TIPC_NLA_BEARER_NAME])
 750                 return -EINVAL;
 751         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 752
 753         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 754         if (!rep)
 755                 return -ENOMEM;
 756
 757         msg.skb = rep;
 758         msg.portid = info->snd_portid;
 759         msg.seq = info->snd_seq;
 760
 761         rtnl_lock();
 762         bearer = tipc_bearer_find(net, name);
 763         if (!bearer) {
 764                 err = -EINVAL;
 765                 goto err_out;
 766         }
 767
 768         err = __tipc_nl_add_bearer(&msg, bearer);
 769         if (err)
 770                 goto err_out;
 771         rtnl_unlock();
 772
 773         return genlmsg_reply(rep, info);
 774 err_out:
 775         rtnl_unlock();
 776         nlmsg_free(rep);
 777
 778         return err;
 779 }
 780
 781 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 782 {
 783         int err;
 784         char *name;
 785         struct tipc_bearer *bearer;
 786         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 787         struct net *net = genl_info_net(info);
 788
 789         if (!info->attrs[TIPC_NLA_BEARER])
 790                 return -EINVAL;
 791
 792         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 793                                info->attrs[TIPC_NLA_BEARER],
 794                                tipc_nl_bearer_policy);
 795         if (err)
 796                 return err;
 797
 798         if (!attrs[TIPC_NLA_BEARER_NAME])
 799                 return -EINVAL;
 800
 801         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 802
 803         rtnl_lock();
 804         bearer = tipc_bearer_find(net, name);
 805         if (!bearer) {
 806                 rtnl_unlock();
 807                 return -EINVAL;
 808         }
 809
 810         bearer_disable(net, bearer, false);
 811         rtnl_unlock();
 812
 813         return 0;
 814 }
 815
 816 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 817 {
 818         struct net *net = genl_info_net(info);
 819         int err;
 820         char *bearer;
 821         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 822         u32 domain;
 823         u32 prio;
 824
 825         prio = TIPC_MEDIA_LINK_PRI;
 826         domain = tipc_own_addr & TIPC_CLUSTER_MASK;
 827
 828         if (!info->attrs[TIPC_NLA_BEARER])
 829                 return -EINVAL;
 830
 831         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 832                                info->attrs[TIPC_NLA_BEARER],
 833                                tipc_nl_bearer_policy);
 834         if (err)
 835                 return err;
 836
 837         if (!attrs[TIPC_NLA_BEARER_NAME])
 838                 return -EINVAL;
 839
 840         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 841
 842         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 843                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 844
 845         if (attrs[TIPC_NLA_BEARER_PROP]) {
 846                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 847
 848                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 849                                               props);
 850                 if (err)
 851                         return err;
 852
 853                 if (props[TIPC_NLA_PROP_PRIO])
 854                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 855         }
 856
 857         rtnl_lock();
 858         err = tipc_enable_bearer(net, bearer, domain, prio);
 859         if (err) {
 860                 rtnl_unlock();
 861                 return err;
 862         }
 863         rtnl_unlock();
 864
 865         return 0;
 866 }
 867
 868 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 869 {
 870         int err;
 871         char *name;
 872         struct tipc_bearer *b;
 873         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 874         struct net *net = genl_info_net(info);
 875
 876         if (!info->attrs[TIPC_NLA_BEARER])
 877                 return -EINVAL;
 878
 879         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 880                                info->attrs[TIPC_NLA_BEARER],
 881                                tipc_nl_bearer_policy);
 882         if (err)
 883                 return err;
 884
 885         if (!attrs[TIPC_NLA_BEARER_NAME])
 886                 return -EINVAL;
 887         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 888
 889         rtnl_lock();
 890         b = tipc_bearer_find(net, name);
 891         if (!b) {
 892                 rtnl_unlock();
 893                 return -EINVAL;
 894         }
 895
 896         if (attrs[TIPC_NLA_BEARER_PROP]) {
 897                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 898
 899                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 900                                               props);
 901                 if (err) {
 902                         rtnl_unlock();
 903                         return err;
 904                 }
 905
 906                 if (props[TIPC_NLA_PROP_TOL])
 907                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
 908                 if (props[TIPC_NLA_PROP_PRIO])
 909                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 910                 if (props[TIPC_NLA_PROP_WIN])
 911                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
 912         }
 913         rtnl_unlock();
 914
 915         return 0;
 916 }
 917
 918 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
 919                                struct tipc_media *media)
 920 {
 921         void *hdr;
 922         struct nlattr *attrs;
 923         struct nlattr *prop;
 924
 925         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family,
 926                           NLM_F_MULTI, TIPC_NL_MEDIA_GET);
 927         if (!hdr)
 928                 return -EMSGSIZE;
 929
 930         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
 931         if (!attrs)
 932                 goto msg_full;
 933
 934         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
 935                 goto attr_msg_full;
 936
 937         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
 938         if (!prop)
 939                 goto prop_msg_full;
 940         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
 941                 goto prop_msg_full;
 942         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
 943                 goto prop_msg_full;
 944         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
 945                 goto prop_msg_full;
 946
 947         nla_nest_end(msg->skb, prop);
 948         nla_nest_end(msg->skb, attrs);
 949         genlmsg_end(msg->skb, hdr);
 950
 951         return 0;
 952
 953 prop_msg_full:
 954         nla_nest_cancel(msg->skb, prop);
 955 attr_msg_full:
 956         nla_nest_cancel(msg->skb, attrs);
 957 msg_full:
 958         genlmsg_cancel(msg->skb, hdr);
 959
 960         return -EMSGSIZE;
 961 }
 962
 963 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
 964 {
 965         int err;
 966         int i = cb->args[0];
 967         struct tipc_nl_msg msg;
 968
 969         if (i == MAX_MEDIA)
 970                 return 0;
 971
 972         msg.skb = skb;
 973         msg.portid = NETLINK_CB(cb->skb).portid;
 974         msg.seq = cb->nlh->nlmsg_seq;
 975
 976         rtnl_lock();
 977         for (; media_info_array[i] != NULL; i++) {
 978                 err = __tipc_nl_add_media(&msg, media_info_array[i]);
 979                 if (err)
 980                         break;
 981         }
 982         rtnl_unlock();
 983
 984         cb->args[0] = i;
 985         return skb->len;
 986 }
 987
 988 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 989 {
 990         int err;
 991         char *name;
 992         struct tipc_nl_msg msg;
 993         struct tipc_media *media;
 994         struct sk_buff *rep;
 995         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 996
 997         if (!info->attrs[TIPC_NLA_MEDIA])
 998                 return -EINVAL;
 999
1000         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1001                                info->attrs[TIPC_NLA_MEDIA],
1002                                tipc_nl_media_policy);
1003         if (err)
1004                 return err;
1005
1006         if (!attrs[TIPC_NLA_MEDIA_NAME])
1007                 return -EINVAL;
1008         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1009
1010         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1011         if (!rep)
1012                 return -ENOMEM;
1013
1014         msg.skb = rep;
1015         msg.portid = info->snd_portid;
1016         msg.seq = info->snd_seq;
1017
1018         rtnl_lock();
1019         media = tipc_media_find(name);
1020         if (!media) {
1021                 err = -EINVAL;
1022                 goto err_out;
1023         }
1024
1025         err = __tipc_nl_add_media(&msg, media);
1026         if (err)
1027                 goto err_out;
1028         rtnl_unlock();
1029
1030         return genlmsg_reply(rep, info);
1031 err_out:
1032         rtnl_unlock();
1033         nlmsg_free(rep);
1034
1035         return err;
1036 }
1037
1038 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1039 {
1040         int err;
1041         char *name;
1042         struct tipc_media *m;
1043         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1044
1045         if (!info->attrs[TIPC_NLA_MEDIA])
1046                 return -EINVAL;
1047
1048         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1049                                info->attrs[TIPC_NLA_MEDIA],
1050                                tipc_nl_media_policy);
1051
1052         if (!attrs[TIPC_NLA_MEDIA_NAME])
1053                 return -EINVAL;
1054         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1055
1056         rtnl_lock();
1057         m = tipc_media_find(name);
1058         if (!m) {
1059                 rtnl_unlock();
1060                 return -EINVAL;
1061         }
1062
1063         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1064                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1065
1066                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1067                                               props);
1068                 if (err) {
1069                         rtnl_unlock();
1070                         return err;
1071                 }
1072
1073                 if (props[TIPC_NLA_PROP_TOL])
1074                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1075                 if (props[TIPC_NLA_PROP_PRIO])
1076                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1077                 if (props[TIPC_NLA_PROP_WIN])
1078                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1079         }
1080         rtnl_unlock();
1081
1082         return 0;
1083 }