net/tipc/bearer.c

   1 /*
   2  * net/tipc/bearer.c: TIPC bearer code
   3  *
   4  * Copyright (c) 1996-2006, 2013-2014, Ericsson AB
   5  * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include <net/sock.h>
  38 #include "core.h"
  39 #include "bearer.h"
  40 #include "link.h"
  41 #include "discover.h"
  42 #include "bcast.h"
  43 #include "netlink.h"
  44
  45 #define MAX_ADDR_STR 60
  46
  47 static struct tipc_media * const media_info_array[] = {
  48         &eth_media_info,
  49 #ifdef CONFIG_TIPC_MEDIA_IB
  50         &ib_media_info,
  51 #endif
  52 #ifdef CONFIG_TIPC_MEDIA_UDP
  53         &udp_media_info,
  54 #endif
  55         NULL
  56 };
  57
  58 static void bearer_disable(struct net *net, struct tipc_bearer *b);
  59
  60 /**
  61  * tipc_media_find - locates specified media object by name
  62  */
  63 struct tipc_media *tipc_media_find(const char *name)
  64 {
  65         u32 i;
  66
  67         for (i = 0; media_info_array[i] != NULL; i++) {
  68                 if (!strcmp(media_info_array[i]->name, name))
  69                         break;
  70         }
  71         return media_info_array[i];
  72 }
  73
  74 /**
  75  * media_find_id - locates specified media object by type identifier
  76  */
  77 static struct tipc_media *media_find_id(u8 type)
  78 {
  79         u32 i;
  80
  81         for (i = 0; media_info_array[i] != NULL; i++) {
  82                 if (media_info_array[i]->type_id == type)
  83                         break;
  84         }
  85         return media_info_array[i];
  86 }
  87
  88 /**
  89  * tipc_media_addr_printf - record media address in print buffer
  90  */
  91 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
  92 {
  93         char addr_str[MAX_ADDR_STR];
  94         struct tipc_media *m;
  95         int ret;
  96
  97         m = media_find_id(a->media_id);
  98
  99         if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
 100                 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
 101         else {
 102                 u32 i;
 103
 104                 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
 105                 for (i = 0; i < sizeof(a->value); i++)
 106                         ret += scnprintf(buf - ret, len + ret,
 107                                             "-%02x", a->value[i]);
 108         }
 109 }
 110
 111 /**
 112  * bearer_name_validate - validate & (optionally) deconstruct bearer name
 113  * @name: ptr to bearer name string
 114  * @name_parts: ptr to area for bearer name components (or NULL if not needed)
 115  *
 116  * Returns 1 if bearer name is valid, otherwise 0.
 117  */
 118 static int bearer_name_validate(const char *name,
 119                                 struct tipc_bearer_names *name_parts)
 120 {
 121         char name_copy[TIPC_MAX_BEARER_NAME];
 122         char *media_name;
 123         char *if_name;
 124         u32 media_len;
 125         u32 if_len;
 126
 127         /* copy bearer name & ensure length is OK */
 128         name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 129         /* need above in case non-Posix strncpy() doesn't pad with nulls */
 130         strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 131         if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 132                 return 0;
 133
 134         /* ensure all component parts of bearer name are present */
 135         media_name = name_copy;
 136         if_name = strchr(media_name, ':');
 137         if (if_name == NULL)
 138                 return 0;
 139         *(if_name++) = 0;
 140         media_len = if_name - media_name;
 141         if_len = strlen(if_name) + 1;
 142
 143         /* validate component parts of bearer name */
 144         if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 145             (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
 146                 return 0;
 147
 148         /* return bearer name components, if necessary */
 149         if (name_parts) {
 150                 strcpy(name_parts->media_name, media_name);
 151                 strcpy(name_parts->if_name, if_name);
 152         }
 153         return 1;
 154 }
 155
 156 /**
 157  * tipc_bearer_find - locates bearer object with matching bearer name
 158  */
 159 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
 160 {
 161         struct tipc_net *tn = net_generic(net, tipc_net_id);
 162         struct tipc_bearer *b;
 163         u32 i;
 164
 165         for (i = 0; i < MAX_BEARERS; i++) {
 166                 b = rtnl_dereference(tn->bearer_list[i]);
 167                 if (b && (!strcmp(b->name, name)))
 168                         return b;
 169         }
 170         return NULL;
 171 }
 172
 173 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
 174 {
 175         struct tipc_net *tn = net_generic(net, tipc_net_id);
 176         struct tipc_bearer *b;
 177
 178         rcu_read_lock();
 179         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 180         if (b)
 181                 tipc_disc_add_dest(b->link_req);
 182         rcu_read_unlock();
 183 }
 184
 185 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
 186 {
 187         struct tipc_net *tn = net_generic(net, tipc_net_id);
 188         struct tipc_bearer *b;
 189
 190         rcu_read_lock();
 191         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 192         if (b)
 193                 tipc_disc_remove_dest(b->link_req);
 194         rcu_read_unlock();
 195 }
 196
 197 /**
 198  * tipc_enable_bearer - enable bearer with the given name
 199  */
 200 static int tipc_enable_bearer(struct net *net, const char *name,
 201                               u32 disc_domain, u32 priority,
 202                               struct nlattr *attr[])
 203 {
 204         struct tipc_net *tn = net_generic(net, tipc_net_id);
 205         struct tipc_bearer *b;
 206         struct tipc_media *m;
 207         struct tipc_bearer_names b_names;
 208         struct sk_buff *skb;
 209         char addr_string[16];
 210         u32 bearer_id;
 211         u32 with_this_prio;
 212         u32 i;
 213         int res = -EINVAL;
 214
 215         if (!tn->own_addr) {
 216                 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
 217                         name);
 218                 return -ENOPROTOOPT;
 219         }
 220         if (!bearer_name_validate(name, &b_names)) {
 221                 pr_warn("Bearer <%s> rejected, illegal name\n", name);
 222                 return -EINVAL;
 223         }
 224         if (tipc_addr_domain_valid(disc_domain) &&
 225             (disc_domain != tn->own_addr)) {
 226                 if (tipc_in_scope(disc_domain, tn->own_addr)) {
 227                         disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
 228                         res = 0;   /* accept any node in own cluster */
 229                 } else if (in_own_cluster_exact(net, disc_domain))
 230                         res = 0;   /* accept specified node in own cluster */
 231         }
 232         if (res) {
 233                 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
 234                         name);
 235                 return -EINVAL;
 236         }
 237         if ((priority > TIPC_MAX_LINK_PRI) &&
 238             (priority != TIPC_MEDIA_LINK_PRI)) {
 239                 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
 240                 return -EINVAL;
 241         }
 242
 243         m = tipc_media_find(b_names.media_name);
 244         if (!m) {
 245                 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
 246                         name, b_names.media_name);
 247                 return -EINVAL;
 248         }
 249
 250         if (priority == TIPC_MEDIA_LINK_PRI)
 251                 priority = m->priority;
 252
 253 restart:
 254         bearer_id = MAX_BEARERS;
 255         with_this_prio = 1;
 256         for (i = MAX_BEARERS; i-- != 0; ) {
 257                 b = rtnl_dereference(tn->bearer_list[i]);
 258                 if (!b) {
 259                         bearer_id = i;
 260                         continue;
 261                 }
 262                 if (!strcmp(name, b->name)) {
 263                         pr_warn("Bearer <%s> rejected, already enabled\n",
 264                                 name);
 265                         return -EINVAL;
 266                 }
 267                 if ((b->priority == priority) &&
 268                     (++with_this_prio > 2)) {
 269                         if (priority-- == 0) {
 270                                 pr_warn("Bearer <%s> rejected, duplicate priority\n",
 271                                         name);
 272                                 return -EINVAL;
 273                         }
 274                         pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
 275                                 name, priority + 1, priority);
 276                         goto restart;
 277                 }
 278         }
 279         if (bearer_id >= MAX_BEARERS) {
 280                 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 281                         name, MAX_BEARERS);
 282                 return -EINVAL;
 283         }
 284
 285         b = kzalloc(sizeof(*b), GFP_ATOMIC);
 286         if (!b)
 287                 return -ENOMEM;
 288
 289         strcpy(b->name, name);
 290         b->media = m;
 291         res = m->enable_media(net, b, attr);
 292         if (res) {
 293                 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
 294                         name, -res);
 295                 return -EINVAL;
 296         }
 297
 298         b->identity = bearer_id;
 299         b->tolerance = m->tolerance;
 300         b->window = m->window;
 301         b->domain = disc_domain;
 302         b->net_plane = bearer_id + 'A';
 303         b->priority = priority;
 304
 305         res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
 306         if (res) {
 307                 bearer_disable(net, b);
 308                 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
 309                         name);
 310                 return -EINVAL;
 311         }
 312
 313         rcu_assign_pointer(tn->bearer_list[bearer_id], b);
 314         if (skb)
 315                 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
 316         pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 317                 name,
 318                 tipc_addr_string_fill(addr_string, disc_domain), priority);
 319         return res;
 320 }
 321
 322 /**
 323  * tipc_reset_bearer - Reset all links established over this bearer
 324  */
 325 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
 326 {
 327         pr_info("Resetting bearer <%s>\n", b->name);
 328         tipc_node_delete_links(net, b->identity);
 329         tipc_disc_reset(net, b);
 330         return 0;
 331 }
 332
 333 /* tipc_bearer_reset_all - reset all links on all bearers
 334  */
 335 void tipc_bearer_reset_all(struct net *net)
 336 {
 337         struct tipc_net *tn = tipc_net(net);
 338         struct tipc_bearer *b;
 339         int i;
 340
 341         for (i = 0; i < MAX_BEARERS; i++) {
 342                 b = rcu_dereference_rtnl(tn->bearer_list[i]);
 343                 if (b)
 344                         tipc_reset_bearer(net, b);
 345         }
 346 }
 347
 348 /**
 349  * bearer_disable
 350  *
 351  * Note: This routine assumes caller holds RTNL lock.
 352  */
 353 static void bearer_disable(struct net *net, struct tipc_bearer *b)
 354 {
 355         struct tipc_net *tn = tipc_net(net);
 356         int bearer_id = b->identity;
 357
 358         pr_info("Disabling bearer <%s>\n", b->name);
 359         b->media->disable_media(b);
 360         tipc_node_delete_links(net, bearer_id);
 361         RCU_INIT_POINTER(b->media_ptr, NULL);
 362         if (b->link_req)
 363                 tipc_disc_delete(b->link_req);
 364         RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
 365         kfree_rcu(b, rcu);
 366 }
 367
 368 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 369                          struct nlattr *attr[])
 370 {
 371         struct net_device *dev;
 372         char *driver_name = strchr((const char *)b->name, ':') + 1;
 373
 374         /* Find device with specified name */
 375         dev = dev_get_by_name(net, driver_name);
 376         if (!dev)
 377                 return -ENODEV;
 378
 379         /* Associate TIPC bearer with L2 bearer */
 380         rcu_assign_pointer(b->media_ptr, dev);
 381         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 382         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 383         b->bcast_addr.media_id = b->media->type_id;
 384         b->bcast_addr.broadcast = 1;
 385         b->mtu = dev->mtu;
 386         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 387         rcu_assign_pointer(dev->tipc_ptr, b);
 388         return 0;
 389 }
 390
 391 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 392  *
 393  * Mark L2 bearer as inactive so that incoming buffers are thrown away
 394  */
 395 void tipc_disable_l2_media(struct tipc_bearer *b)
 396 {
 397         struct net_device *dev;
 398
 399         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 400         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 401         synchronize_net();
 402         dev_put(dev);
 403 }
 404
 405 /**
 406  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 407  * @skb: the packet to be sent
 408  * @b: the bearer through which the packet is to be sent
 409  * @dest: peer destination address
 410  */
 411 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
 412                      struct tipc_bearer *b, struct tipc_media_addr *dest)
 413 {
 414         struct net_device *dev;
 415         int delta;
 416         void *tipc_ptr;
 417
 418         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
 419         if (!dev)
 420                 return 0;
 421
 422         /* Send RESET message even if bearer is detached from device */
 423         tipc_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
 424         if (unlikely(!tipc_ptr && !msg_is_reset(buf_msg(skb))))
 425                 goto drop;
 426
 427         delta = dev->hard_header_len - skb_headroom(skb);
 428         if ((delta > 0) &&
 429             pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC))
 430                 goto drop;
 431
 432         skb_reset_network_header(skb);
 433         skb->dev = dev;
 434         skb->protocol = htons(ETH_P_TIPC);
 435         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
 436                         dev->dev_addr, skb->len);
 437         dev_queue_xmit(skb);
 438         return 0;
 439 drop:
 440         kfree_skb(skb);
 441         return 0;
 442 }
 443
 444 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
 445 {
 446         int mtu = 0;
 447         struct tipc_bearer *b;
 448
 449         rcu_read_lock();
 450         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
 451         if (b)
 452                 mtu = b->mtu;
 453         rcu_read_unlock();
 454         return mtu;
 455 }
 456
 457 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
 458  */
 459 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
 460                           struct sk_buff *skb,
 461                           struct tipc_media_addr *dest)
 462 {
 463         struct tipc_net *tn = tipc_net(net);
 464         struct tipc_bearer *b;
 465
 466         rcu_read_lock();
 467         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 468         if (likely(b))
 469                 b->media->send_msg(net, skb, b, dest);
 470         else
 471                 kfree_skb(skb);
 472         rcu_read_unlock();
 473 }
 474
 475 /* tipc_bearer_xmit() -send buffer to destination over bearer
 476  */
 477 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
 478                       struct sk_buff_head *xmitq,
 479                       struct tipc_media_addr *dst)
 480 {
 481         struct tipc_net *tn = net_generic(net, tipc_net_id);
 482         struct tipc_bearer *b;
 483         struct sk_buff *skb, *tmp;
 484
 485         if (skb_queue_empty(xmitq))
 486                 return;
 487
 488         rcu_read_lock();
 489         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 490         if (unlikely(!b))
 491                 __skb_queue_purge(xmitq);
 492         skb_queue_walk_safe(xmitq, skb, tmp) {
 493                 __skb_dequeue(xmitq);
 494                 b->media->send_msg(net, skb, b, dst);
 495         }
 496         rcu_read_unlock();
 497 }
 498
 499 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
 500  */
 501 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
 502                          struct sk_buff_head *xmitq)
 503 {
 504         struct tipc_net *tn = tipc_net(net);
 505         int net_id = tn->net_id;
 506         struct tipc_bearer *b;
 507         struct sk_buff *skb, *tmp;
 508         struct tipc_msg *hdr;
 509
 510         rcu_read_lock();
 511         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 512         if (unlikely(!b))
 513                 __skb_queue_purge(xmitq);
 514         skb_queue_walk_safe(xmitq, skb, tmp) {
 515                 hdr = buf_msg(skb);
 516                 msg_set_non_seq(hdr, 1);
 517                 msg_set_mc_netid(hdr, net_id);
 518                 __skb_dequeue(xmitq);
 519                 b->media->send_msg(net, skb, b, &b->bcast_addr);
 520         }
 521         rcu_read_unlock();
 522 }
 523
 524 /**
 525  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 526  * @buf: the received packet
 527  * @dev: the net device that the packet was received on
 528  * @pt: the packet_type structure which was used to register this handler
 529  * @orig_dev: the original receive net device in case the device is a bond
 530  *
 531  * Accept only packets explicitly sent to this node, or broadcast packets;
 532  * ignores packets sent using interface multicast, and traffic sent to other
 533  * nodes (which can happen if interface is running in promiscuous mode).
 534  */
 535 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
 536                            struct packet_type *pt, struct net_device *orig_dev)
 537 {
 538         struct tipc_bearer *b;
 539
 540         rcu_read_lock();
 541         b = rcu_dereference_rtnl(dev->tipc_ptr);
 542         if (likely(b && (skb->pkt_type <= PACKET_BROADCAST))) {
 543                 skb->next = NULL;
 544                 tipc_rcv(dev_net(dev), skb, b);
 545                 rcu_read_unlock();
 546                 return NET_RX_SUCCESS;
 547         }
 548         rcu_read_unlock();
 549         kfree_skb(skb);
 550         return NET_RX_DROP;
 551 }
 552
 553 /**
 554  * tipc_l2_device_event - handle device events from network device
 555  * @nb: the context of the notification
 556  * @evt: the type of event
 557  * @ptr: the net device that the event was on
 558  *
 559  * This function is called by the Ethernet driver in case of link
 560  * change event.
 561  */
 562 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 563                                 void *ptr)
 564 {
 565         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 566         struct net *net = dev_net(dev);
 567         struct tipc_net *tn = tipc_net(net);
 568         struct tipc_bearer *b;
 569         int i;
 570
 571         b = rtnl_dereference(dev->tipc_ptr);
 572         if (!b) {
 573                 for (i = 0; i < MAX_BEARERS; b = NULL, i++) {
 574                         b = rtnl_dereference(tn->bearer_list[i]);
 575                         if (b && (b->media_ptr == dev))
 576                                 break;
 577                 }
 578         }
 579         if (!b)
 580                 return NOTIFY_DONE;
 581
 582         b->mtu = dev->mtu;
 583
 584         switch (evt) {
 585         case NETDEV_CHANGE:
 586                 if (netif_carrier_ok(dev))
 587                         break;
 588         case NETDEV_UP:
 589                 rcu_assign_pointer(dev->tipc_ptr, b);
 590                 break;
 591         case NETDEV_GOING_DOWN:
 592                 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 593                 synchronize_net();
 594                 tipc_reset_bearer(net, b);
 595                 break;
 596         case NETDEV_CHANGEMTU:
 597                 tipc_reset_bearer(net, b);
 598                 break;
 599         case NETDEV_CHANGEADDR:
 600                 b->media->raw2addr(b, &b->addr,
 601                                    (char *)dev->dev_addr);
 602                 tipc_reset_bearer(net, b);
 603                 break;
 604         case NETDEV_UNREGISTER:
 605         case NETDEV_CHANGENAME:
 606                 bearer_disable(dev_net(dev), b);
 607                 break;
 608         }
 609         return NOTIFY_OK;
 610 }
 611
 612 static struct packet_type tipc_packet_type __read_mostly = {
 613         .type = htons(ETH_P_TIPC),
 614         .func = tipc_l2_rcv_msg,
 615 };
 616
 617 static struct notifier_block notifier = {
 618         .notifier_call  = tipc_l2_device_event,
 619         .priority       = 0,
 620 };
 621
 622 int tipc_bearer_setup(void)
 623 {
 624         int err;
 625
 626         err = register_netdevice_notifier(&notifier);
 627         if (err)
 628                 return err;
 629         dev_add_pack(&tipc_packet_type);
 630         return 0;
 631 }
 632
 633 void tipc_bearer_cleanup(void)
 634 {
 635         unregister_netdevice_notifier(&notifier);
 636         dev_remove_pack(&tipc_packet_type);
 637 }
 638
 639 void tipc_bearer_stop(struct net *net)
 640 {
 641         struct tipc_net *tn = net_generic(net, tipc_net_id);
 642         struct tipc_bearer *b;
 643         u32 i;
 644
 645         for (i = 0; i < MAX_BEARERS; i++) {
 646                 b = rtnl_dereference(tn->bearer_list[i]);
 647                 if (b) {
 648                         bearer_disable(net, b);
 649                         tn->bearer_list[i] = NULL;
 650                 }
 651         }
 652 }
 653
 654 /* Caller should hold rtnl_lock to protect the bearer */
 655 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 656                                 struct tipc_bearer *bearer, int nlflags)
 657 {
 658         void *hdr;
 659         struct nlattr *attrs;
 660         struct nlattr *prop;
 661
 662         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 663                           nlflags, TIPC_NL_BEARER_GET);
 664         if (!hdr)
 665                 return -EMSGSIZE;
 666
 667         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
 668         if (!attrs)
 669                 goto msg_full;
 670
 671         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 672                 goto attr_msg_full;
 673
 674         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
 675         if (!prop)
 676                 goto prop_msg_full;
 677         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 678                 goto prop_msg_full;
 679         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 680                 goto prop_msg_full;
 681         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 682                 goto prop_msg_full;
 683
 684         nla_nest_end(msg->skb, prop);
 685         nla_nest_end(msg->skb, attrs);
 686         genlmsg_end(msg->skb, hdr);
 687
 688         return 0;
 689
 690 prop_msg_full:
 691         nla_nest_cancel(msg->skb, prop);
 692 attr_msg_full:
 693         nla_nest_cancel(msg->skb, attrs);
 694 msg_full:
 695         genlmsg_cancel(msg->skb, hdr);
 696
 697         return -EMSGSIZE;
 698 }
 699
 700 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 701 {
 702         int err;
 703         int i = cb->args[0];
 704         struct tipc_bearer *bearer;
 705         struct tipc_nl_msg msg;
 706         struct net *net = sock_net(skb->sk);
 707         struct tipc_net *tn = net_generic(net, tipc_net_id);
 708
 709         if (i == MAX_BEARERS)
 710                 return 0;
 711
 712         msg.skb = skb;
 713         msg.portid = NETLINK_CB(cb->skb).portid;
 714         msg.seq = cb->nlh->nlmsg_seq;
 715
 716         rtnl_lock();
 717         for (i = 0; i < MAX_BEARERS; i++) {
 718                 bearer = rtnl_dereference(tn->bearer_list[i]);
 719                 if (!bearer)
 720                         continue;
 721
 722                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
 723                 if (err)
 724                         break;
 725         }
 726         rtnl_unlock();
 727
 728         cb->args[0] = i;
 729         return skb->len;
 730 }
 731
 732 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 733 {
 734         int err;
 735         char *name;
 736         struct sk_buff *rep;
 737         struct tipc_bearer *bearer;
 738         struct tipc_nl_msg msg;
 739         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 740         struct net *net = genl_info_net(info);
 741
 742         if (!info->attrs[TIPC_NLA_BEARER])
 743                 return -EINVAL;
 744
 745         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 746                                info->attrs[TIPC_NLA_BEARER],
 747                                tipc_nl_bearer_policy);
 748         if (err)
 749                 return err;
 750
 751         if (!attrs[TIPC_NLA_BEARER_NAME])
 752                 return -EINVAL;
 753         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 754
 755         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 756         if (!rep)
 757                 return -ENOMEM;
 758
 759         msg.skb = rep;
 760         msg.portid = info->snd_portid;
 761         msg.seq = info->snd_seq;
 762
 763         rtnl_lock();
 764         bearer = tipc_bearer_find(net, name);
 765         if (!bearer) {
 766                 err = -EINVAL;
 767                 goto err_out;
 768         }
 769
 770         err = __tipc_nl_add_bearer(&msg, bearer, 0);
 771         if (err)
 772                 goto err_out;
 773         rtnl_unlock();
 774
 775         return genlmsg_reply(rep, info);
 776 err_out:
 777         rtnl_unlock();
 778         nlmsg_free(rep);
 779
 780         return err;
 781 }
 782
 783 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 784 {
 785         int err;
 786         char *name;
 787         struct tipc_bearer *bearer;
 788         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 789         struct net *net = sock_net(skb->sk);
 790
 791         if (!info->attrs[TIPC_NLA_BEARER])
 792                 return -EINVAL;
 793
 794         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 795                                info->attrs[TIPC_NLA_BEARER],
 796                                tipc_nl_bearer_policy);
 797         if (err)
 798                 return err;
 799
 800         if (!attrs[TIPC_NLA_BEARER_NAME])
 801                 return -EINVAL;
 802
 803         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 804
 805         rtnl_lock();
 806         bearer = tipc_bearer_find(net, name);
 807         if (!bearer) {
 808                 rtnl_unlock();
 809                 return -EINVAL;
 810         }
 811
 812         bearer_disable(net, bearer);
 813         rtnl_unlock();
 814
 815         return 0;
 816 }
 817
 818 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 819 {
 820         int err;
 821         char *bearer;
 822         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 823         struct net *net = sock_net(skb->sk);
 824         struct tipc_net *tn = net_generic(net, tipc_net_id);
 825         u32 domain;
 826         u32 prio;
 827
 828         prio = TIPC_MEDIA_LINK_PRI;
 829         domain = tn->own_addr & TIPC_CLUSTER_MASK;
 830
 831         if (!info->attrs[TIPC_NLA_BEARER])
 832                 return -EINVAL;
 833
 834         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 835                                info->attrs[TIPC_NLA_BEARER],
 836                                tipc_nl_bearer_policy);
 837         if (err)
 838                 return err;
 839
 840         if (!attrs[TIPC_NLA_BEARER_NAME])
 841                 return -EINVAL;
 842
 843         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 844
 845         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 846                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 847
 848         if (attrs[TIPC_NLA_BEARER_PROP]) {
 849                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 850
 851                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 852                                               props);
 853                 if (err)
 854                         return err;
 855
 856                 if (props[TIPC_NLA_PROP_PRIO])
 857                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 858         }
 859
 860         rtnl_lock();
 861         err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
 862         if (err) {
 863                 rtnl_unlock();
 864                 return err;
 865         }
 866         rtnl_unlock();
 867
 868         return 0;
 869 }
 870
 871 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 872 {
 873         int err;
 874         char *name;
 875         struct tipc_bearer *b;
 876         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 877         struct net *net = sock_net(skb->sk);
 878
 879         if (!info->attrs[TIPC_NLA_BEARER])
 880                 return -EINVAL;
 881
 882         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 883                                info->attrs[TIPC_NLA_BEARER],
 884                                tipc_nl_bearer_policy);
 885         if (err)
 886                 return err;
 887
 888         if (!attrs[TIPC_NLA_BEARER_NAME])
 889                 return -EINVAL;
 890         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 891
 892         rtnl_lock();
 893         b = tipc_bearer_find(net, name);
 894         if (!b) {
 895                 rtnl_unlock();
 896                 return -EINVAL;
 897         }
 898
 899         if (attrs[TIPC_NLA_BEARER_PROP]) {
 900                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 901
 902                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 903                                               props);
 904                 if (err) {
 905                         rtnl_unlock();
 906                         return err;
 907                 }
 908
 909                 if (props[TIPC_NLA_PROP_TOL])
 910                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
 911                 if (props[TIPC_NLA_PROP_PRIO])
 912                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 913                 if (props[TIPC_NLA_PROP_WIN])
 914                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
 915         }
 916         rtnl_unlock();
 917
 918         return 0;
 919 }
 920
 921 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
 922                                struct tipc_media *media, int nlflags)
 923 {
 924         void *hdr;
 925         struct nlattr *attrs;
 926         struct nlattr *prop;
 927
 928         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 929                           nlflags, TIPC_NL_MEDIA_GET);
 930         if (!hdr)
 931                 return -EMSGSIZE;
 932
 933         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
 934         if (!attrs)
 935                 goto msg_full;
 936
 937         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
 938                 goto attr_msg_full;
 939
 940         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
 941         if (!prop)
 942                 goto prop_msg_full;
 943         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
 944                 goto prop_msg_full;
 945         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
 946                 goto prop_msg_full;
 947         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
 948                 goto prop_msg_full;
 949
 950         nla_nest_end(msg->skb, prop);
 951         nla_nest_end(msg->skb, attrs);
 952         genlmsg_end(msg->skb, hdr);
 953
 954         return 0;
 955
 956 prop_msg_full:
 957         nla_nest_cancel(msg->skb, prop);
 958 attr_msg_full:
 959         nla_nest_cancel(msg->skb, attrs);
 960 msg_full:
 961         genlmsg_cancel(msg->skb, hdr);
 962
 963         return -EMSGSIZE;
 964 }
 965
 966 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
 967 {
 968         int err;
 969         int i = cb->args[0];
 970         struct tipc_nl_msg msg;
 971
 972         if (i == MAX_MEDIA)
 973                 return 0;
 974
 975         msg.skb = skb;
 976         msg.portid = NETLINK_CB(cb->skb).portid;
 977         msg.seq = cb->nlh->nlmsg_seq;
 978
 979         rtnl_lock();
 980         for (; media_info_array[i] != NULL; i++) {
 981                 err = __tipc_nl_add_media(&msg, media_info_array[i],
 982                                           NLM_F_MULTI);
 983                 if (err)
 984                         break;
 985         }
 986         rtnl_unlock();
 987
 988         cb->args[0] = i;
 989         return skb->len;
 990 }
 991
 992 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 993 {
 994         int err;
 995         char *name;
 996         struct tipc_nl_msg msg;
 997         struct tipc_media *media;
 998         struct sk_buff *rep;
 999         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1000
1001         if (!info->attrs[TIPC_NLA_MEDIA])
1002                 return -EINVAL;
1003
1004         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1005                                info->attrs[TIPC_NLA_MEDIA],
1006                                tipc_nl_media_policy);
1007         if (err)
1008                 return err;
1009
1010         if (!attrs[TIPC_NLA_MEDIA_NAME])
1011                 return -EINVAL;
1012         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1013
1014         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1015         if (!rep)
1016                 return -ENOMEM;
1017
1018         msg.skb = rep;
1019         msg.portid = info->snd_portid;
1020         msg.seq = info->snd_seq;
1021
1022         rtnl_lock();
1023         media = tipc_media_find(name);
1024         if (!media) {
1025                 err = -EINVAL;
1026                 goto err_out;
1027         }
1028
1029         err = __tipc_nl_add_media(&msg, media, 0);
1030         if (err)
1031                 goto err_out;
1032         rtnl_unlock();
1033
1034         return genlmsg_reply(rep, info);
1035 err_out:
1036         rtnl_unlock();
1037         nlmsg_free(rep);
1038
1039         return err;
1040 }
1041
1042 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1043 {
1044         int err;
1045         char *name;
1046         struct tipc_media *m;
1047         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1048
1049         if (!info->attrs[TIPC_NLA_MEDIA])
1050                 return -EINVAL;
1051
1052         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1053                                info->attrs[TIPC_NLA_MEDIA],
1054                                tipc_nl_media_policy);
1055
1056         if (!attrs[TIPC_NLA_MEDIA_NAME])
1057                 return -EINVAL;
1058         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1059
1060         rtnl_lock();
1061         m = tipc_media_find(name);
1062         if (!m) {
1063                 rtnl_unlock();
1064                 return -EINVAL;
1065         }
1066
1067         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1068                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1069
1070                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1071                                               props);
1072                 if (err) {
1073                         rtnl_unlock();
1074                         return err;
1075                 }
1076
1077                 if (props[TIPC_NLA_PROP_TOL])
1078                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1079                 if (props[TIPC_NLA_PROP_PRIO])
1080                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1081                 if (props[TIPC_NLA_PROP_WIN])
1082                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1083         }
1084         rtnl_unlock();
1085
1086         return 0;
1087 }