net/tipc/bearer.c

   1 /*
   2  * net/tipc/bearer.c: TIPC bearer code
   3  *
   4  * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
   5  * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include <net/sock.h>
  38 #include "core.h"
  39 #include "bearer.h"
  40 #include "link.h"
  41 #include "discover.h"
  42 #include "monitor.h"
  43 #include "bcast.h"
  44 #include "netlink.h"
  45 #include "udp_media.h"
  46
  47 #define MAX_ADDR_STR 60
  48
  49 static struct tipc_media * const media_info_array[] = {
  50         &eth_media_info,
  51 #ifdef CONFIG_TIPC_MEDIA_IB
  52         &ib_media_info,
  53 #endif
  54 #ifdef CONFIG_TIPC_MEDIA_UDP
  55         &udp_media_info,
  56 #endif
  57         NULL
  58 };
  59
  60 static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
  61 {
  62         struct tipc_net *tn = tipc_net(net);
  63
  64         return rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
  65 }
  66
  67 static void bearer_disable(struct net *net, struct tipc_bearer *b);
  68
  69 /**
  70  * tipc_media_find - locates specified media object by name
  71  */
  72 struct tipc_media *tipc_media_find(const char *name)
  73 {
  74         u32 i;
  75
  76         for (i = 0; media_info_array[i] != NULL; i++) {
  77                 if (!strcmp(media_info_array[i]->name, name))
  78                         break;
  79         }
  80         return media_info_array[i];
  81 }
  82
  83 /**
  84  * media_find_id - locates specified media object by type identifier
  85  */
  86 static struct tipc_media *media_find_id(u8 type)
  87 {
  88         u32 i;
  89
  90         for (i = 0; media_info_array[i] != NULL; i++) {
  91                 if (media_info_array[i]->type_id == type)
  92                         break;
  93         }
  94         return media_info_array[i];
  95 }
  96
  97 /**
  98  * tipc_media_addr_printf - record media address in print buffer
  99  */
 100 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
 101 {
 102         char addr_str[MAX_ADDR_STR];
 103         struct tipc_media *m;
 104         int ret;
 105
 106         m = media_find_id(a->media_id);
 107
 108         if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
 109                 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
 110         else {
 111                 u32 i;
 112
 113                 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
 114                 for (i = 0; i < sizeof(a->value); i++)
 115                         ret += scnprintf(buf - ret, len + ret,
 116                                             "-%02x", a->value[i]);
 117         }
 118 }
 119
 120 /**
 121  * bearer_name_validate - validate & (optionally) deconstruct bearer name
 122  * @name: ptr to bearer name string
 123  * @name_parts: ptr to area for bearer name components (or NULL if not needed)
 124  *
 125  * Returns 1 if bearer name is valid, otherwise 0.
 126  */
 127 static int bearer_name_validate(const char *name,
 128                                 struct tipc_bearer_names *name_parts)
 129 {
 130         char name_copy[TIPC_MAX_BEARER_NAME];
 131         char *media_name;
 132         char *if_name;
 133         u32 media_len;
 134         u32 if_len;
 135
 136         /* copy bearer name & ensure length is OK */
 137         name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 138         /* need above in case non-Posix strncpy() doesn't pad with nulls */
 139         strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 140         if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 141                 return 0;
 142
 143         /* ensure all component parts of bearer name are present */
 144         media_name = name_copy;
 145         if_name = strchr(media_name, ':');
 146         if (if_name == NULL)
 147                 return 0;
 148         *(if_name++) = 0;
 149         media_len = if_name - media_name;
 150         if_len = strlen(if_name) + 1;
 151
 152         /* validate component parts of bearer name */
 153         if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 154             (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
 155                 return 0;
 156
 157         /* return bearer name components, if necessary */
 158         if (name_parts) {
 159                 strcpy(name_parts->media_name, media_name);
 160                 strcpy(name_parts->if_name, if_name);
 161         }
 162         return 1;
 163 }
 164
 165 /**
 166  * tipc_bearer_find - locates bearer object with matching bearer name
 167  */
 168 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
 169 {
 170         struct tipc_net *tn = net_generic(net, tipc_net_id);
 171         struct tipc_bearer *b;
 172         u32 i;
 173
 174         for (i = 0; i < MAX_BEARERS; i++) {
 175                 b = rtnl_dereference(tn->bearer_list[i]);
 176                 if (b && (!strcmp(b->name, name)))
 177                         return b;
 178         }
 179         return NULL;
 180 }
 181
 182 /*     tipc_bearer_get_name - get the bearer name from its id.
 183  *     @net: network namespace
 184  *     @name: a pointer to the buffer where the name will be stored.
 185  *     @bearer_id: the id to get the name from.
 186  */
 187 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
 188 {
 189         struct tipc_net *tn = tipc_net(net);
 190         struct tipc_bearer *b;
 191
 192         if (bearer_id >= MAX_BEARERS)
 193                 return -EINVAL;
 194
 195         b = rtnl_dereference(tn->bearer_list[bearer_id]);
 196         if (!b)
 197                 return -EINVAL;
 198
 199         strcpy(name, b->name);
 200         return 0;
 201 }
 202
 203 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
 204 {
 205         struct tipc_net *tn = net_generic(net, tipc_net_id);
 206         struct tipc_bearer *b;
 207
 208         rcu_read_lock();
 209         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 210         if (b)
 211                 tipc_disc_add_dest(b->link_req);
 212         rcu_read_unlock();
 213 }
 214
 215 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
 216 {
 217         struct tipc_net *tn = net_generic(net, tipc_net_id);
 218         struct tipc_bearer *b;
 219
 220         rcu_read_lock();
 221         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 222         if (b)
 223                 tipc_disc_remove_dest(b->link_req);
 224         rcu_read_unlock();
 225 }
 226
 227 /**
 228  * tipc_enable_bearer - enable bearer with the given name
 229  */
 230 static int tipc_enable_bearer(struct net *net, const char *name,
 231                               u32 disc_domain, u32 priority,
 232                               struct nlattr *attr[])
 233 {
 234         struct tipc_net *tn = net_generic(net, tipc_net_id);
 235         struct tipc_bearer *b;
 236         struct tipc_media *m;
 237         struct tipc_bearer_names b_names;
 238         struct sk_buff *skb;
 239         char addr_string[16];
 240         u32 bearer_id;
 241         u32 with_this_prio;
 242         u32 i;
 243         int res = -EINVAL;
 244
 245         if (!tn->own_addr) {
 246                 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
 247                         name);
 248                 return -ENOPROTOOPT;
 249         }
 250         if (!bearer_name_validate(name, &b_names)) {
 251                 pr_warn("Bearer <%s> rejected, illegal name\n", name);
 252                 return -EINVAL;
 253         }
 254         if (tipc_addr_domain_valid(disc_domain) &&
 255             (disc_domain != tn->own_addr)) {
 256                 if (tipc_in_scope(disc_domain, tn->own_addr)) {
 257                         disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
 258                         res = 0;   /* accept any node in own cluster */
 259                 } else if (in_own_cluster_exact(net, disc_domain))
 260                         res = 0;   /* accept specified node in own cluster */
 261         }
 262         if (res) {
 263                 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
 264                         name);
 265                 return -EINVAL;
 266         }
 267         if ((priority > TIPC_MAX_LINK_PRI) &&
 268             (priority != TIPC_MEDIA_LINK_PRI)) {
 269                 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
 270                 return -EINVAL;
 271         }
 272
 273         m = tipc_media_find(b_names.media_name);
 274         if (!m) {
 275                 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
 276                         name, b_names.media_name);
 277                 return -EINVAL;
 278         }
 279
 280         if (priority == TIPC_MEDIA_LINK_PRI)
 281                 priority = m->priority;
 282
 283 restart:
 284         bearer_id = MAX_BEARERS;
 285         with_this_prio = 1;
 286         for (i = MAX_BEARERS; i-- != 0; ) {
 287                 b = rtnl_dereference(tn->bearer_list[i]);
 288                 if (!b) {
 289                         bearer_id = i;
 290                         continue;
 291                 }
 292                 if (!strcmp(name, b->name)) {
 293                         pr_warn("Bearer <%s> rejected, already enabled\n",
 294                                 name);
 295                         return -EINVAL;
 296                 }
 297                 if ((b->priority == priority) &&
 298                     (++with_this_prio > 2)) {
 299                         if (priority-- == 0) {
 300                                 pr_warn("Bearer <%s> rejected, duplicate priority\n",
 301                                         name);
 302                                 return -EINVAL;
 303                         }
 304                         pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
 305                                 name, priority + 1, priority);
 306                         goto restart;
 307                 }
 308         }
 309         if (bearer_id >= MAX_BEARERS) {
 310                 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 311                         name, MAX_BEARERS);
 312                 return -EINVAL;
 313         }
 314
 315         b = kzalloc(sizeof(*b), GFP_ATOMIC);
 316         if (!b)
 317                 return -ENOMEM;
 318
 319         strcpy(b->name, name);
 320         b->media = m;
 321         res = m->enable_media(net, b, attr);
 322         if (res) {
 323                 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
 324                         name, -res);
 325                 return -EINVAL;
 326         }
 327
 328         b->identity = bearer_id;
 329         b->tolerance = m->tolerance;
 330         b->window = m->window;
 331         b->domain = disc_domain;
 332         b->net_plane = bearer_id + 'A';
 333         b->priority = priority;
 334         test_and_set_bit_lock(0, &b->up);
 335
 336         res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
 337         if (res) {
 338                 bearer_disable(net, b);
 339                 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
 340                         name);
 341                 return -EINVAL;
 342         }
 343
 344         rcu_assign_pointer(tn->bearer_list[bearer_id], b);
 345         if (skb)
 346                 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
 347
 348         if (tipc_mon_create(net, bearer_id))
 349                 return -ENOMEM;
 350
 351         pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 352                 name,
 353                 tipc_addr_string_fill(addr_string, disc_domain), priority);
 354         return res;
 355 }
 356
 357 /**
 358  * tipc_reset_bearer - Reset all links established over this bearer
 359  */
 360 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
 361 {
 362         pr_info("Resetting bearer <%s>\n", b->name);
 363         tipc_node_delete_links(net, b->identity);
 364         tipc_disc_reset(net, b);
 365         return 0;
 366 }
 367
 368 /* tipc_bearer_reset_all - reset all links on all bearers
 369  */
 370 void tipc_bearer_reset_all(struct net *net)
 371 {
 372         struct tipc_bearer *b;
 373         int i;
 374
 375         for (i = 0; i < MAX_BEARERS; i++) {
 376                 b = bearer_get(net, i);
 377                 if (b)
 378                         clear_bit_unlock(0, &b->up);
 379         }
 380         for (i = 0; i < MAX_BEARERS; i++) {
 381                 b = bearer_get(net, i);
 382                 if (b)
 383                         tipc_reset_bearer(net, b);
 384         }
 385         for (i = 0; i < MAX_BEARERS; i++) {
 386                 b = bearer_get(net, i);
 387                 if (b)
 388                         test_and_set_bit_lock(0, &b->up);
 389         }
 390 }
 391
 392 /**
 393  * bearer_disable
 394  *
 395  * Note: This routine assumes caller holds RTNL lock.
 396  */
 397 static void bearer_disable(struct net *net, struct tipc_bearer *b)
 398 {
 399         struct tipc_net *tn = tipc_net(net);
 400         int bearer_id = b->identity;
 401
 402         pr_info("Disabling bearer <%s>\n", b->name);
 403         clear_bit_unlock(0, &b->up);
 404         tipc_node_delete_links(net, bearer_id);
 405         b->media->disable_media(b);
 406         RCU_INIT_POINTER(b->media_ptr, NULL);
 407         if (b->link_req)
 408                 tipc_disc_delete(b->link_req);
 409         RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
 410         kfree_rcu(b, rcu);
 411         tipc_mon_delete(net, bearer_id);
 412 }
 413
 414 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 415                          struct nlattr *attr[])
 416 {
 417         struct net_device *dev;
 418         char *driver_name = strchr((const char *)b->name, ':') + 1;
 419
 420         /* Find device with specified name */
 421         dev = dev_get_by_name(net, driver_name);
 422         if (!dev)
 423                 return -ENODEV;
 424         if (tipc_mtu_bad(dev, 0)) {
 425                 dev_put(dev);
 426                 return -EINVAL;
 427         }
 428
 429         /* Associate TIPC bearer with L2 bearer */
 430         rcu_assign_pointer(b->media_ptr, dev);
 431         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 432         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 433         b->bcast_addr.media_id = b->media->type_id;
 434         b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
 435         b->mtu = dev->mtu;
 436         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 437         rcu_assign_pointer(dev->tipc_ptr, b);
 438         return 0;
 439 }
 440
 441 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 442  *
 443  * Mark L2 bearer as inactive so that incoming buffers are thrown away
 444  */
 445 void tipc_disable_l2_media(struct tipc_bearer *b)
 446 {
 447         struct net_device *dev;
 448
 449         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 450         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 451         synchronize_net();
 452         dev_put(dev);
 453 }
 454
 455 /**
 456  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 457  * @skb: the packet to be sent
 458  * @b: the bearer through which the packet is to be sent
 459  * @dest: peer destination address
 460  */
 461 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
 462                      struct tipc_bearer *b, struct tipc_media_addr *dest)
 463 {
 464         struct net_device *dev;
 465         int delta;
 466
 467         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
 468         if (!dev)
 469                 return 0;
 470
 471         delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
 472         if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
 473                 kfree_skb(skb);
 474                 return 0;
 475         }
 476         skb_reset_network_header(skb);
 477         skb->dev = dev;
 478         skb->protocol = htons(ETH_P_TIPC);
 479         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
 480                         dev->dev_addr, skb->len);
 481         dev_queue_xmit(skb);
 482         return 0;
 483 }
 484
 485 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
 486 {
 487         bool supp = false;
 488         struct tipc_bearer *b;
 489
 490         rcu_read_lock();
 491         b = bearer_get(net, bearer_id);
 492         if (b)
 493                 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
 494         rcu_read_unlock();
 495         return supp;
 496 }
 497
 498 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
 499 {
 500         int mtu = 0;
 501         struct tipc_bearer *b;
 502
 503         rcu_read_lock();
 504         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
 505         if (b)
 506                 mtu = b->mtu;
 507         rcu_read_unlock();
 508         return mtu;
 509 }
 510
 511 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
 512  */
 513 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
 514                           struct sk_buff *skb,
 515                           struct tipc_media_addr *dest)
 516 {
 517         struct tipc_msg *hdr = buf_msg(skb);
 518         struct tipc_bearer *b;
 519
 520         rcu_read_lock();
 521         b = bearer_get(net, bearer_id);
 522         if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
 523                 b->media->send_msg(net, skb, b, dest);
 524         else
 525                 kfree_skb(skb);
 526         rcu_read_unlock();
 527 }
 528
 529 /* tipc_bearer_xmit() -send buffer to destination over bearer
 530  */
 531 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
 532                       struct sk_buff_head *xmitq,
 533                       struct tipc_media_addr *dst)
 534 {
 535         struct tipc_bearer *b;
 536         struct sk_buff *skb, *tmp;
 537
 538         if (skb_queue_empty(xmitq))
 539                 return;
 540
 541         rcu_read_lock();
 542         b = bearer_get(net, bearer_id);
 543         if (unlikely(!b))
 544                 __skb_queue_purge(xmitq);
 545         skb_queue_walk_safe(xmitq, skb, tmp) {
 546                 __skb_dequeue(xmitq);
 547                 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
 548                         b->media->send_msg(net, skb, b, dst);
 549                 else
 550                         kfree_skb(skb);
 551         }
 552         rcu_read_unlock();
 553 }
 554
 555 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
 556  */
 557 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
 558                          struct sk_buff_head *xmitq)
 559 {
 560         struct tipc_net *tn = tipc_net(net);
 561         int net_id = tn->net_id;
 562         struct tipc_bearer *b;
 563         struct sk_buff *skb, *tmp;
 564         struct tipc_msg *hdr;
 565
 566         rcu_read_lock();
 567         b = bearer_get(net, bearer_id);
 568         if (unlikely(!b || !test_bit(0, &b->up)))
 569                 __skb_queue_purge(xmitq);
 570         skb_queue_walk_safe(xmitq, skb, tmp) {
 571                 hdr = buf_msg(skb);
 572                 msg_set_non_seq(hdr, 1);
 573                 msg_set_mc_netid(hdr, net_id);
 574                 __skb_dequeue(xmitq);
 575                 b->media->send_msg(net, skb, b, &b->bcast_addr);
 576         }
 577         rcu_read_unlock();
 578 }
 579
 580 /**
 581  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 582  * @buf: the received packet
 583  * @dev: the net device that the packet was received on
 584  * @pt: the packet_type structure which was used to register this handler
 585  * @orig_dev: the original receive net device in case the device is a bond
 586  *
 587  * Accept only packets explicitly sent to this node, or broadcast packets;
 588  * ignores packets sent using interface multicast, and traffic sent to other
 589  * nodes (which can happen if interface is running in promiscuous mode).
 590  */
 591 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
 592                            struct packet_type *pt, struct net_device *orig_dev)
 593 {
 594         struct tipc_bearer *b;
 595
 596         rcu_read_lock();
 597         b = rcu_dereference_rtnl(dev->tipc_ptr);
 598         if (likely(b && test_bit(0, &b->up) &&
 599                    (skb->pkt_type <= PACKET_BROADCAST))) {
 600                 skb->next = NULL;
 601                 tipc_rcv(dev_net(dev), skb, b);
 602                 rcu_read_unlock();
 603                 return NET_RX_SUCCESS;
 604         }
 605         rcu_read_unlock();
 606         kfree_skb(skb);
 607         return NET_RX_DROP;
 608 }
 609
 610 /**
 611  * tipc_l2_device_event - handle device events from network device
 612  * @nb: the context of the notification
 613  * @evt: the type of event
 614  * @ptr: the net device that the event was on
 615  *
 616  * This function is called by the Ethernet driver in case of link
 617  * change event.
 618  */
 619 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 620                                 void *ptr)
 621 {
 622         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 623         struct net *net = dev_net(dev);
 624         struct tipc_bearer *b;
 625
 626         b = rtnl_dereference(dev->tipc_ptr);
 627         if (!b)
 628                 return NOTIFY_DONE;
 629
 630         switch (evt) {
 631         case NETDEV_CHANGE:
 632                 if (netif_carrier_ok(dev))
 633                         break;
 634         case NETDEV_UP:
 635                 test_and_set_bit_lock(0, &b->up);
 636                 break;
 637         case NETDEV_GOING_DOWN:
 638                 clear_bit_unlock(0, &b->up);
 639                 tipc_reset_bearer(net, b);
 640                 break;
 641         case NETDEV_CHANGEMTU:
 642                 if (tipc_mtu_bad(dev, 0)) {
 643                         bearer_disable(net, b);
 644                         break;
 645                 }
 646                 b->mtu = dev->mtu;
 647                 tipc_reset_bearer(net, b);
 648                 break;
 649         case NETDEV_CHANGEADDR:
 650                 b->media->raw2addr(b, &b->addr,
 651                                    (char *)dev->dev_addr);
 652                 tipc_reset_bearer(net, b);
 653                 break;
 654         case NETDEV_UNREGISTER:
 655         case NETDEV_CHANGENAME:
 656                 bearer_disable(dev_net(dev), b);
 657                 break;
 658         }
 659         return NOTIFY_OK;
 660 }
 661
 662 static struct packet_type tipc_packet_type __read_mostly = {
 663         .type = htons(ETH_P_TIPC),
 664         .func = tipc_l2_rcv_msg,
 665 };
 666
 667 static struct notifier_block notifier = {
 668         .notifier_call  = tipc_l2_device_event,
 669         .priority       = 0,
 670 };
 671
 672 int tipc_bearer_setup(void)
 673 {
 674         int err;
 675
 676         err = register_netdevice_notifier(&notifier);
 677         if (err)
 678                 return err;
 679         dev_add_pack(&tipc_packet_type);
 680         return 0;
 681 }
 682
 683 void tipc_bearer_cleanup(void)
 684 {
 685         unregister_netdevice_notifier(&notifier);
 686         dev_remove_pack(&tipc_packet_type);
 687 }
 688
 689 void tipc_bearer_stop(struct net *net)
 690 {
 691         struct tipc_net *tn = net_generic(net, tipc_net_id);
 692         struct tipc_bearer *b;
 693         u32 i;
 694
 695         for (i = 0; i < MAX_BEARERS; i++) {
 696                 b = rtnl_dereference(tn->bearer_list[i]);
 697                 if (b) {
 698                         bearer_disable(net, b);
 699                         tn->bearer_list[i] = NULL;
 700                 }
 701         }
 702 }
 703
 704 /* Caller should hold rtnl_lock to protect the bearer */
 705 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 706                                 struct tipc_bearer *bearer, int nlflags)
 707 {
 708         void *hdr;
 709         struct nlattr *attrs;
 710         struct nlattr *prop;
 711
 712         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 713                           nlflags, TIPC_NL_BEARER_GET);
 714         if (!hdr)
 715                 return -EMSGSIZE;
 716
 717         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
 718         if (!attrs)
 719                 goto msg_full;
 720
 721         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 722                 goto attr_msg_full;
 723
 724         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
 725         if (!prop)
 726                 goto prop_msg_full;
 727         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 728                 goto prop_msg_full;
 729         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 730                 goto prop_msg_full;
 731         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 732                 goto prop_msg_full;
 733
 734         nla_nest_end(msg->skb, prop);
 735
 736 #ifdef CONFIG_TIPC_MEDIA_UDP
 737         if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
 738                 if (tipc_udp_nl_add_bearer_data(msg, bearer))
 739                         goto attr_msg_full;
 740         }
 741 #endif
 742
 743         nla_nest_end(msg->skb, attrs);
 744         genlmsg_end(msg->skb, hdr);
 745
 746         return 0;
 747
 748 prop_msg_full:
 749         nla_nest_cancel(msg->skb, prop);
 750 attr_msg_full:
 751         nla_nest_cancel(msg->skb, attrs);
 752 msg_full:
 753         genlmsg_cancel(msg->skb, hdr);
 754
 755         return -EMSGSIZE;
 756 }
 757
 758 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 759 {
 760         int err;
 761         int i = cb->args[0];
 762         struct tipc_bearer *bearer;
 763         struct tipc_nl_msg msg;
 764         struct net *net = sock_net(skb->sk);
 765         struct tipc_net *tn = net_generic(net, tipc_net_id);
 766
 767         if (i == MAX_BEARERS)
 768                 return 0;
 769
 770         msg.skb = skb;
 771         msg.portid = NETLINK_CB(cb->skb).portid;
 772         msg.seq = cb->nlh->nlmsg_seq;
 773
 774         rtnl_lock();
 775         for (i = 0; i < MAX_BEARERS; i++) {
 776                 bearer = rtnl_dereference(tn->bearer_list[i]);
 777                 if (!bearer)
 778                         continue;
 779
 780                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
 781                 if (err)
 782                         break;
 783         }
 784         rtnl_unlock();
 785
 786         cb->args[0] = i;
 787         return skb->len;
 788 }
 789
 790 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 791 {
 792         int err;
 793         char *name;
 794         struct sk_buff *rep;
 795         struct tipc_bearer *bearer;
 796         struct tipc_nl_msg msg;
 797         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 798         struct net *net = genl_info_net(info);
 799
 800         if (!info->attrs[TIPC_NLA_BEARER])
 801                 return -EINVAL;
 802
 803         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 804                                info->attrs[TIPC_NLA_BEARER],
 805                                tipc_nl_bearer_policy, info->extack);
 806         if (err)
 807                 return err;
 808
 809         if (!attrs[TIPC_NLA_BEARER_NAME])
 810                 return -EINVAL;
 811         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 812
 813         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 814         if (!rep)
 815                 return -ENOMEM;
 816
 817         msg.skb = rep;
 818         msg.portid = info->snd_portid;
 819         msg.seq = info->snd_seq;
 820
 821         rtnl_lock();
 822         bearer = tipc_bearer_find(net, name);
 823         if (!bearer) {
 824                 err = -EINVAL;
 825                 goto err_out;
 826         }
 827
 828         err = __tipc_nl_add_bearer(&msg, bearer, 0);
 829         if (err)
 830                 goto err_out;
 831         rtnl_unlock();
 832
 833         return genlmsg_reply(rep, info);
 834 err_out:
 835         rtnl_unlock();
 836         nlmsg_free(rep);
 837
 838         return err;
 839 }
 840
 841 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 842 {
 843         int err;
 844         char *name;
 845         struct tipc_bearer *bearer;
 846         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 847         struct net *net = sock_net(skb->sk);
 848
 849         if (!info->attrs[TIPC_NLA_BEARER])
 850                 return -EINVAL;
 851
 852         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 853                                info->attrs[TIPC_NLA_BEARER],
 854                                tipc_nl_bearer_policy, info->extack);
 855         if (err)
 856                 return err;
 857
 858         if (!attrs[TIPC_NLA_BEARER_NAME])
 859                 return -EINVAL;
 860
 861         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 862
 863         rtnl_lock();
 864         bearer = tipc_bearer_find(net, name);
 865         if (!bearer) {
 866                 rtnl_unlock();
 867                 return -EINVAL;
 868         }
 869
 870         bearer_disable(net, bearer);
 871         rtnl_unlock();
 872
 873         return 0;
 874 }
 875
 876 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 877 {
 878         int err;
 879         char *bearer;
 880         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 881         struct net *net = sock_net(skb->sk);
 882         struct tipc_net *tn = net_generic(net, tipc_net_id);
 883         u32 domain;
 884         u32 prio;
 885
 886         prio = TIPC_MEDIA_LINK_PRI;
 887         domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
 888
 889         if (!info->attrs[TIPC_NLA_BEARER])
 890                 return -EINVAL;
 891
 892         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 893                                info->attrs[TIPC_NLA_BEARER],
 894                                tipc_nl_bearer_policy, info->extack);
 895         if (err)
 896                 return err;
 897
 898         if (!attrs[TIPC_NLA_BEARER_NAME])
 899                 return -EINVAL;
 900
 901         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 902
 903         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 904                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 905
 906         if (attrs[TIPC_NLA_BEARER_PROP]) {
 907                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 908
 909                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 910                                               props);
 911                 if (err)
 912                         return err;
 913
 914                 if (props[TIPC_NLA_PROP_PRIO])
 915                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 916         }
 917
 918         rtnl_lock();
 919         err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
 920         if (err) {
 921                 rtnl_unlock();
 922                 return err;
 923         }
 924         rtnl_unlock();
 925
 926         return 0;
 927 }
 928
 929 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
 930 {
 931         int err;
 932         char *name;
 933         struct tipc_bearer *b;
 934         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 935         struct net *net = sock_net(skb->sk);
 936
 937         if (!info->attrs[TIPC_NLA_BEARER])
 938                 return -EINVAL;
 939
 940         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 941                                info->attrs[TIPC_NLA_BEARER],
 942                                tipc_nl_bearer_policy, info->extack);
 943         if (err)
 944                 return err;
 945
 946         if (!attrs[TIPC_NLA_BEARER_NAME])
 947                 return -EINVAL;
 948         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 949
 950         rtnl_lock();
 951         b = tipc_bearer_find(net, name);
 952         if (!b) {
 953                 rtnl_unlock();
 954                 return -EINVAL;
 955         }
 956
 957 #ifdef CONFIG_TIPC_MEDIA_UDP
 958         if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
 959                 err = tipc_udp_nl_bearer_add(b,
 960                                              attrs[TIPC_NLA_BEARER_UDP_OPTS]);
 961                 if (err) {
 962                         rtnl_unlock();
 963                         return err;
 964                 }
 965         }
 966 #endif
 967         rtnl_unlock();
 968
 969         return 0;
 970 }
 971
 972 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 973 {
 974         int err;
 975         char *name;
 976         struct tipc_bearer *b;
 977         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 978         struct net *net = sock_net(skb->sk);
 979
 980         if (!info->attrs[TIPC_NLA_BEARER])
 981                 return -EINVAL;
 982
 983         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 984                                info->attrs[TIPC_NLA_BEARER],
 985                                tipc_nl_bearer_policy, info->extack);
 986         if (err)
 987                 return err;
 988
 989         if (!attrs[TIPC_NLA_BEARER_NAME])
 990                 return -EINVAL;
 991         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 992
 993         rtnl_lock();
 994         b = tipc_bearer_find(net, name);
 995         if (!b) {
 996                 rtnl_unlock();
 997                 return -EINVAL;
 998         }
 999
1000         if (attrs[TIPC_NLA_BEARER_PROP]) {
1001                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1002
1003                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1004                                               props);
1005                 if (err) {
1006                         rtnl_unlock();
1007                         return err;
1008                 }
1009
1010                 if (props[TIPC_NLA_PROP_TOL])
1011                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1012                 if (props[TIPC_NLA_PROP_PRIO])
1013                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1014                 if (props[TIPC_NLA_PROP_WIN])
1015                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1016         }
1017         rtnl_unlock();
1018
1019         return 0;
1020 }
1021
1022 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1023                                struct tipc_media *media, int nlflags)
1024 {
1025         void *hdr;
1026         struct nlattr *attrs;
1027         struct nlattr *prop;
1028
1029         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1030                           nlflags, TIPC_NL_MEDIA_GET);
1031         if (!hdr)
1032                 return -EMSGSIZE;
1033
1034         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1035         if (!attrs)
1036                 goto msg_full;
1037
1038         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1039                 goto attr_msg_full;
1040
1041         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1042         if (!prop)
1043                 goto prop_msg_full;
1044         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1045                 goto prop_msg_full;
1046         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1047                 goto prop_msg_full;
1048         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1049                 goto prop_msg_full;
1050
1051         nla_nest_end(msg->skb, prop);
1052         nla_nest_end(msg->skb, attrs);
1053         genlmsg_end(msg->skb, hdr);
1054
1055         return 0;
1056
1057 prop_msg_full:
1058         nla_nest_cancel(msg->skb, prop);
1059 attr_msg_full:
1060         nla_nest_cancel(msg->skb, attrs);
1061 msg_full:
1062         genlmsg_cancel(msg->skb, hdr);
1063
1064         return -EMSGSIZE;
1065 }
1066
1067 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1068 {
1069         int err;
1070         int i = cb->args[0];
1071         struct tipc_nl_msg msg;
1072
1073         if (i == MAX_MEDIA)
1074                 return 0;
1075
1076         msg.skb = skb;
1077         msg.portid = NETLINK_CB(cb->skb).portid;
1078         msg.seq = cb->nlh->nlmsg_seq;
1079
1080         rtnl_lock();
1081         for (; media_info_array[i] != NULL; i++) {
1082                 err = __tipc_nl_add_media(&msg, media_info_array[i],
1083                                           NLM_F_MULTI);
1084                 if (err)
1085                         break;
1086         }
1087         rtnl_unlock();
1088
1089         cb->args[0] = i;
1090         return skb->len;
1091 }
1092
1093 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1094 {
1095         int err;
1096         char *name;
1097         struct tipc_nl_msg msg;
1098         struct tipc_media *media;
1099         struct sk_buff *rep;
1100         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1101
1102         if (!info->attrs[TIPC_NLA_MEDIA])
1103                 return -EINVAL;
1104
1105         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1106                                info->attrs[TIPC_NLA_MEDIA],
1107                                tipc_nl_media_policy, info->extack);
1108         if (err)
1109                 return err;
1110
1111         if (!attrs[TIPC_NLA_MEDIA_NAME])
1112                 return -EINVAL;
1113         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1114
1115         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1116         if (!rep)
1117                 return -ENOMEM;
1118
1119         msg.skb = rep;
1120         msg.portid = info->snd_portid;
1121         msg.seq = info->snd_seq;
1122
1123         rtnl_lock();
1124         media = tipc_media_find(name);
1125         if (!media) {
1126                 err = -EINVAL;
1127                 goto err_out;
1128         }
1129
1130         err = __tipc_nl_add_media(&msg, media, 0);
1131         if (err)
1132                 goto err_out;
1133         rtnl_unlock();
1134
1135         return genlmsg_reply(rep, info);
1136 err_out:
1137         rtnl_unlock();
1138         nlmsg_free(rep);
1139
1140         return err;
1141 }
1142
1143 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1144 {
1145         int err;
1146         char *name;
1147         struct tipc_media *m;
1148         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1149
1150         if (!info->attrs[TIPC_NLA_MEDIA])
1151                 return -EINVAL;
1152
1153         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1154                                info->attrs[TIPC_NLA_MEDIA],
1155                                tipc_nl_media_policy, info->extack);
1156
1157         if (!attrs[TIPC_NLA_MEDIA_NAME])
1158                 return -EINVAL;
1159         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1160
1161         rtnl_lock();
1162         m = tipc_media_find(name);
1163         if (!m) {
1164                 rtnl_unlock();
1165                 return -EINVAL;
1166         }
1167
1168         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1169                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1170
1171                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1172                                               props);
1173                 if (err) {
1174                         rtnl_unlock();
1175                         return err;
1176                 }
1177
1178                 if (props[TIPC_NLA_PROP_TOL])
1179                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1180                 if (props[TIPC_NLA_PROP_PRIO])
1181                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1182                 if (props[TIPC_NLA_PROP_WIN])
1183                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1184         }
1185         rtnl_unlock();
1186
1187         return 0;
1188 }