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 /**
 334  * bearer_disable
 335  *
 336  * Note: This routine assumes caller holds RTNL lock.
 337  */
 338 static void bearer_disable(struct net *net, struct tipc_bearer *b)
 339 {
 340         struct tipc_net *tn = tipc_net(net);
 341         int bearer_id = b->identity;
 342
 343         pr_info("Disabling bearer <%s>\n", b->name);
 344         b->media->disable_media(b);
 345         tipc_node_delete_links(net, bearer_id);
 346         RCU_INIT_POINTER(b->media_ptr, NULL);
 347         if (b->link_req)
 348                 tipc_disc_delete(b->link_req);
 349         RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
 350         kfree_rcu(b, rcu);
 351 }
 352
 353 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 354                          struct nlattr *attr[])
 355 {
 356         struct net_device *dev;
 357         char *driver_name = strchr((const char *)b->name, ':') + 1;
 358
 359         /* Find device with specified name */
 360         dev = dev_get_by_name(net, driver_name);
 361         if (!dev)
 362                 return -ENODEV;
 363
 364         /* Associate TIPC bearer with L2 bearer */
 365         rcu_assign_pointer(b->media_ptr, dev);
 366         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 367         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 368         b->bcast_addr.media_id = b->media->type_id;
 369         b->bcast_addr.broadcast = 1;
 370         b->mtu = dev->mtu;
 371         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 372         rcu_assign_pointer(dev->tipc_ptr, b);
 373         return 0;
 374 }
 375
 376 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 377  *
 378  * Mark L2 bearer as inactive so that incoming buffers are thrown away
 379  */
 380 void tipc_disable_l2_media(struct tipc_bearer *b)
 381 {
 382         struct net_device *dev;
 383
 384         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 385         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 386         synchronize_net();
 387         dev_put(dev);
 388 }
 389
 390 /**
 391  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 392  * @skb: the packet to be sent
 393  * @b: the bearer through which the packet is to be sent
 394  * @dest: peer destination address
 395  */
 396 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
 397                      struct tipc_bearer *b, struct tipc_media_addr *dest)
 398 {
 399         struct net_device *dev;
 400         int delta;
 401         void *tipc_ptr;
 402
 403         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
 404         if (!dev)
 405                 return 0;
 406
 407         /* Send RESET message even if bearer is detached from device */
 408         tipc_ptr = rtnl_dereference(dev->tipc_ptr);
 409         if (unlikely(!tipc_ptr && !msg_is_reset(buf_msg(skb))))
 410                 goto drop;
 411
 412         delta = dev->hard_header_len - skb_headroom(skb);
 413         if ((delta > 0) &&
 414             pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC))
 415                 goto drop;
 416
 417         skb_reset_network_header(skb);
 418         skb->dev = dev;
 419         skb->protocol = htons(ETH_P_TIPC);
 420         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
 421                         dev->dev_addr, skb->len);
 422         dev_queue_xmit(skb);
 423         return 0;
 424 drop:
 425         kfree_skb(skb);
 426         return 0;
 427 }
 428
 429 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
 430 {
 431         int mtu = 0;
 432         struct tipc_bearer *b;
 433
 434         rcu_read_lock();
 435         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
 436         if (b)
 437                 mtu = b->mtu;
 438         rcu_read_unlock();
 439         return mtu;
 440 }
 441
 442 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
 443  */
 444 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
 445                           struct sk_buff *skb,
 446                           struct tipc_media_addr *dest)
 447 {
 448         struct tipc_net *tn = tipc_net(net);
 449         struct tipc_bearer *b;
 450
 451         rcu_read_lock();
 452         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 453         if (likely(b))
 454                 b->media->send_msg(net, skb, b, dest);
 455         else
 456                 kfree_skb(skb);
 457         rcu_read_unlock();
 458 }
 459
 460 /* tipc_bearer_xmit() -send buffer to destination over bearer
 461  */
 462 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
 463                       struct sk_buff_head *xmitq,
 464                       struct tipc_media_addr *dst)
 465 {
 466         struct tipc_net *tn = net_generic(net, tipc_net_id);
 467         struct tipc_bearer *b;
 468         struct sk_buff *skb, *tmp;
 469
 470         if (skb_queue_empty(xmitq))
 471                 return;
 472
 473         rcu_read_lock();
 474         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 475         if (unlikely(!b))
 476                 __skb_queue_purge(xmitq);
 477         skb_queue_walk_safe(xmitq, skb, tmp) {
 478                 __skb_dequeue(xmitq);
 479                 b->media->send_msg(net, skb, b, dst);
 480         }
 481         rcu_read_unlock();
 482 }
 483
 484 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
 485  */
 486 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
 487                          struct sk_buff_head *xmitq)
 488 {
 489         struct tipc_net *tn = tipc_net(net);
 490         int net_id = tn->net_id;
 491         struct tipc_bearer *b;
 492         struct sk_buff *skb, *tmp;
 493         struct tipc_msg *hdr;
 494
 495         rcu_read_lock();
 496         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 497         if (unlikely(!b))
 498                 __skb_queue_purge(xmitq);
 499         skb_queue_walk_safe(xmitq, skb, tmp) {
 500                 hdr = buf_msg(skb);
 501                 msg_set_non_seq(hdr, 1);
 502                 msg_set_mc_netid(hdr, net_id);
 503                 __skb_dequeue(xmitq);
 504                 b->media->send_msg(net, skb, b, &b->bcast_addr);
 505         }
 506         rcu_read_unlock();
 507 }
 508
 509 /**
 510  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 511  * @buf: the received packet
 512  * @dev: the net device that the packet was received on
 513  * @pt: the packet_type structure which was used to register this handler
 514  * @orig_dev: the original receive net device in case the device is a bond
 515  *
 516  * Accept only packets explicitly sent to this node, or broadcast packets;
 517  * ignores packets sent using interface multicast, and traffic sent to other
 518  * nodes (which can happen if interface is running in promiscuous mode).
 519  */
 520 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
 521                            struct packet_type *pt, struct net_device *orig_dev)
 522 {
 523         struct tipc_bearer *b;
 524
 525         rcu_read_lock();
 526         b = rcu_dereference_rtnl(dev->tipc_ptr);
 527         if (likely(b && (skb->pkt_type <= PACKET_BROADCAST))) {
 528                 skb->next = NULL;
 529                 tipc_rcv(dev_net(dev), skb, b);
 530                 rcu_read_unlock();
 531                 return NET_RX_SUCCESS;
 532         }
 533         rcu_read_unlock();
 534         kfree_skb(skb);
 535         return NET_RX_DROP;
 536 }
 537
 538 /**
 539  * tipc_l2_device_event - handle device events from network device
 540  * @nb: the context of the notification
 541  * @evt: the type of event
 542  * @ptr: the net device that the event was on
 543  *
 544  * This function is called by the Ethernet driver in case of link
 545  * change event.
 546  */
 547 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 548                                 void *ptr)
 549 {
 550         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 551         struct net *net = dev_net(dev);
 552         struct tipc_net *tn = tipc_net(net);
 553         struct tipc_bearer *b;
 554         int i;
 555
 556         b = rtnl_dereference(dev->tipc_ptr);
 557         if (!b) {
 558                 for (i = 0; i < MAX_BEARERS; b = NULL, i++) {
 559                         b = rtnl_dereference(tn->bearer_list[i]);
 560                         if (b && (b->media_ptr == dev))
 561                                 break;
 562                 }
 563         }
 564         if (!b)
 565                 return NOTIFY_DONE;
 566
 567         b->mtu = dev->mtu;
 568
 569         switch (evt) {
 570         case NETDEV_CHANGE:
 571                 if (netif_carrier_ok(dev))
 572                         break;
 573         case NETDEV_UP:
 574                 rcu_assign_pointer(dev->tipc_ptr, b);
 575                 break;
 576         case NETDEV_GOING_DOWN:
 577                 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 578                 synchronize_net();
 579                 tipc_reset_bearer(net, b);
 580                 break;
 581         case NETDEV_CHANGEMTU:
 582                 tipc_reset_bearer(net, b);
 583                 break;
 584         case NETDEV_CHANGEADDR:
 585                 b->media->raw2addr(b, &b->addr,
 586                                    (char *)dev->dev_addr);
 587                 tipc_reset_bearer(net, b);
 588                 break;
 589         case NETDEV_UNREGISTER:
 590         case NETDEV_CHANGENAME:
 591                 bearer_disable(dev_net(dev), b);
 592                 break;
 593         }
 594         return NOTIFY_OK;
 595 }
 596
 597 static struct packet_type tipc_packet_type __read_mostly = {
 598         .type = htons(ETH_P_TIPC),
 599         .func = tipc_l2_rcv_msg,
 600 };
 601
 602 static struct notifier_block notifier = {
 603         .notifier_call  = tipc_l2_device_event,
 604         .priority       = 0,
 605 };
 606
 607 int tipc_bearer_setup(void)
 608 {
 609         int err;
 610
 611         err = register_netdevice_notifier(&notifier);
 612         if (err)
 613                 return err;
 614         dev_add_pack(&tipc_packet_type);
 615         return 0;
 616 }
 617
 618 void tipc_bearer_cleanup(void)
 619 {
 620         unregister_netdevice_notifier(&notifier);
 621         dev_remove_pack(&tipc_packet_type);
 622 }
 623
 624 void tipc_bearer_stop(struct net *net)
 625 {
 626         struct tipc_net *tn = net_generic(net, tipc_net_id);
 627         struct tipc_bearer *b;
 628         u32 i;
 629
 630         for (i = 0; i < MAX_BEARERS; i++) {
 631                 b = rtnl_dereference(tn->bearer_list[i]);
 632                 if (b) {
 633                         bearer_disable(net, b);
 634                         tn->bearer_list[i] = NULL;
 635                 }
 636         }
 637 }
 638
 639 /* Caller should hold rtnl_lock to protect the bearer */
 640 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 641                                 struct tipc_bearer *bearer, int nlflags)
 642 {
 643         void *hdr;
 644         struct nlattr *attrs;
 645         struct nlattr *prop;
 646
 647         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 648                           nlflags, TIPC_NL_BEARER_GET);
 649         if (!hdr)
 650                 return -EMSGSIZE;
 651
 652         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
 653         if (!attrs)
 654                 goto msg_full;
 655
 656         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 657                 goto attr_msg_full;
 658
 659         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
 660         if (!prop)
 661                 goto prop_msg_full;
 662         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 663                 goto prop_msg_full;
 664         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 665                 goto prop_msg_full;
 666         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 667                 goto prop_msg_full;
 668
 669         nla_nest_end(msg->skb, prop);
 670         nla_nest_end(msg->skb, attrs);
 671         genlmsg_end(msg->skb, hdr);
 672
 673         return 0;
 674
 675 prop_msg_full:
 676         nla_nest_cancel(msg->skb, prop);
 677 attr_msg_full:
 678         nla_nest_cancel(msg->skb, attrs);
 679 msg_full:
 680         genlmsg_cancel(msg->skb, hdr);
 681
 682         return -EMSGSIZE;
 683 }
 684
 685 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 686 {
 687         int err;
 688         int i = cb->args[0];
 689         struct tipc_bearer *bearer;
 690         struct tipc_nl_msg msg;
 691         struct net *net = sock_net(skb->sk);
 692         struct tipc_net *tn = net_generic(net, tipc_net_id);
 693
 694         if (i == MAX_BEARERS)
 695                 return 0;
 696
 697         msg.skb = skb;
 698         msg.portid = NETLINK_CB(cb->skb).portid;
 699         msg.seq = cb->nlh->nlmsg_seq;
 700
 701         rtnl_lock();
 702         for (i = 0; i < MAX_BEARERS; i++) {
 703                 bearer = rtnl_dereference(tn->bearer_list[i]);
 704                 if (!bearer)
 705                         continue;
 706
 707                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
 708                 if (err)
 709                         break;
 710         }
 711         rtnl_unlock();
 712
 713         cb->args[0] = i;
 714         return skb->len;
 715 }
 716
 717 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 718 {
 719         int err;
 720         char *name;
 721         struct sk_buff *rep;
 722         struct tipc_bearer *bearer;
 723         struct tipc_nl_msg msg;
 724         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 725         struct net *net = genl_info_net(info);
 726
 727         if (!info->attrs[TIPC_NLA_BEARER])
 728                 return -EINVAL;
 729
 730         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 731                                info->attrs[TIPC_NLA_BEARER],
 732                                tipc_nl_bearer_policy);
 733         if (err)
 734                 return err;
 735
 736         if (!attrs[TIPC_NLA_BEARER_NAME])
 737                 return -EINVAL;
 738         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 739
 740         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 741         if (!rep)
 742                 return -ENOMEM;
 743
 744         msg.skb = rep;
 745         msg.portid = info->snd_portid;
 746         msg.seq = info->snd_seq;
 747
 748         rtnl_lock();
 749         bearer = tipc_bearer_find(net, name);
 750         if (!bearer) {
 751                 err = -EINVAL;
 752                 goto err_out;
 753         }
 754
 755         err = __tipc_nl_add_bearer(&msg, bearer, 0);
 756         if (err)
 757                 goto err_out;
 758         rtnl_unlock();
 759
 760         return genlmsg_reply(rep, info);
 761 err_out:
 762         rtnl_unlock();
 763         nlmsg_free(rep);
 764
 765         return err;
 766 }
 767
 768 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 769 {
 770         int err;
 771         char *name;
 772         struct tipc_bearer *bearer;
 773         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 774         struct net *net = sock_net(skb->sk);
 775
 776         if (!info->attrs[TIPC_NLA_BEARER])
 777                 return -EINVAL;
 778
 779         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 780                                info->attrs[TIPC_NLA_BEARER],
 781                                tipc_nl_bearer_policy);
 782         if (err)
 783                 return err;
 784
 785         if (!attrs[TIPC_NLA_BEARER_NAME])
 786                 return -EINVAL;
 787
 788         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 789
 790         rtnl_lock();
 791         bearer = tipc_bearer_find(net, name);
 792         if (!bearer) {
 793                 rtnl_unlock();
 794                 return -EINVAL;
 795         }
 796
 797         bearer_disable(net, bearer);
 798         rtnl_unlock();
 799
 800         return 0;
 801 }
 802
 803 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 804 {
 805         int err;
 806         char *bearer;
 807         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 808         struct net *net = sock_net(skb->sk);
 809         struct tipc_net *tn = net_generic(net, tipc_net_id);
 810         u32 domain;
 811         u32 prio;
 812
 813         prio = TIPC_MEDIA_LINK_PRI;
 814         domain = tn->own_addr & TIPC_CLUSTER_MASK;
 815
 816         if (!info->attrs[TIPC_NLA_BEARER])
 817                 return -EINVAL;
 818
 819         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 820                                info->attrs[TIPC_NLA_BEARER],
 821                                tipc_nl_bearer_policy);
 822         if (err)
 823                 return err;
 824
 825         if (!attrs[TIPC_NLA_BEARER_NAME])
 826                 return -EINVAL;
 827
 828         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 829
 830         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 831                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 832
 833         if (attrs[TIPC_NLA_BEARER_PROP]) {
 834                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 835
 836                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 837                                               props);
 838                 if (err)
 839                         return err;
 840
 841                 if (props[TIPC_NLA_PROP_PRIO])
 842                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 843         }
 844
 845         rtnl_lock();
 846         err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
 847         if (err) {
 848                 rtnl_unlock();
 849                 return err;
 850         }
 851         rtnl_unlock();
 852
 853         return 0;
 854 }
 855
 856 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 857 {
 858         int err;
 859         char *name;
 860         struct tipc_bearer *b;
 861         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 862         struct net *net = sock_net(skb->sk);
 863
 864         if (!info->attrs[TIPC_NLA_BEARER])
 865                 return -EINVAL;
 866
 867         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 868                                info->attrs[TIPC_NLA_BEARER],
 869                                tipc_nl_bearer_policy);
 870         if (err)
 871                 return err;
 872
 873         if (!attrs[TIPC_NLA_BEARER_NAME])
 874                 return -EINVAL;
 875         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 876
 877         rtnl_lock();
 878         b = tipc_bearer_find(net, name);
 879         if (!b) {
 880                 rtnl_unlock();
 881                 return -EINVAL;
 882         }
 883
 884         if (attrs[TIPC_NLA_BEARER_PROP]) {
 885                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 886
 887                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 888                                               props);
 889                 if (err) {
 890                         rtnl_unlock();
 891                         return err;
 892                 }
 893
 894                 if (props[TIPC_NLA_PROP_TOL])
 895                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
 896                 if (props[TIPC_NLA_PROP_PRIO])
 897                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 898                 if (props[TIPC_NLA_PROP_WIN])
 899                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
 900         }
 901         rtnl_unlock();
 902
 903         return 0;
 904 }
 905
 906 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
 907                                struct tipc_media *media, int nlflags)
 908 {
 909         void *hdr;
 910         struct nlattr *attrs;
 911         struct nlattr *prop;
 912
 913         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 914                           nlflags, TIPC_NL_MEDIA_GET);
 915         if (!hdr)
 916                 return -EMSGSIZE;
 917
 918         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
 919         if (!attrs)
 920                 goto msg_full;
 921
 922         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
 923                 goto attr_msg_full;
 924
 925         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
 926         if (!prop)
 927                 goto prop_msg_full;
 928         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
 929                 goto prop_msg_full;
 930         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
 931                 goto prop_msg_full;
 932         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
 933                 goto prop_msg_full;
 934
 935         nla_nest_end(msg->skb, prop);
 936         nla_nest_end(msg->skb, attrs);
 937         genlmsg_end(msg->skb, hdr);
 938
 939         return 0;
 940
 941 prop_msg_full:
 942         nla_nest_cancel(msg->skb, prop);
 943 attr_msg_full:
 944         nla_nest_cancel(msg->skb, attrs);
 945 msg_full:
 946         genlmsg_cancel(msg->skb, hdr);
 947
 948         return -EMSGSIZE;
 949 }
 950
 951 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
 952 {
 953         int err;
 954         int i = cb->args[0];
 955         struct tipc_nl_msg msg;
 956
 957         if (i == MAX_MEDIA)
 958                 return 0;
 959
 960         msg.skb = skb;
 961         msg.portid = NETLINK_CB(cb->skb).portid;
 962         msg.seq = cb->nlh->nlmsg_seq;
 963
 964         rtnl_lock();
 965         for (; media_info_array[i] != NULL; i++) {
 966                 err = __tipc_nl_add_media(&msg, media_info_array[i],
 967                                           NLM_F_MULTI);
 968                 if (err)
 969                         break;
 970         }
 971         rtnl_unlock();
 972
 973         cb->args[0] = i;
 974         return skb->len;
 975 }
 976
 977 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 978 {
 979         int err;
 980         char *name;
 981         struct tipc_nl_msg msg;
 982         struct tipc_media *media;
 983         struct sk_buff *rep;
 984         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 985
 986         if (!info->attrs[TIPC_NLA_MEDIA])
 987                 return -EINVAL;
 988
 989         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
 990                                info->attrs[TIPC_NLA_MEDIA],
 991                                tipc_nl_media_policy);
 992         if (err)
 993                 return err;
 994
 995         if (!attrs[TIPC_NLA_MEDIA_NAME])
 996                 return -EINVAL;
 997         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
 998
 999         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1000         if (!rep)
1001                 return -ENOMEM;
1002
1003         msg.skb = rep;
1004         msg.portid = info->snd_portid;
1005         msg.seq = info->snd_seq;
1006
1007         rtnl_lock();
1008         media = tipc_media_find(name);
1009         if (!media) {
1010                 err = -EINVAL;
1011                 goto err_out;
1012         }
1013
1014         err = __tipc_nl_add_media(&msg, media, 0);
1015         if (err)
1016                 goto err_out;
1017         rtnl_unlock();
1018
1019         return genlmsg_reply(rep, info);
1020 err_out:
1021         rtnl_unlock();
1022         nlmsg_free(rep);
1023
1024         return err;
1025 }
1026
1027 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1028 {
1029         int err;
1030         char *name;
1031         struct tipc_media *m;
1032         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1033
1034         if (!info->attrs[TIPC_NLA_MEDIA])
1035                 return -EINVAL;
1036
1037         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1038                                info->attrs[TIPC_NLA_MEDIA],
1039                                tipc_nl_media_policy);
1040
1041         if (!attrs[TIPC_NLA_MEDIA_NAME])
1042                 return -EINVAL;
1043         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1044
1045         rtnl_lock();
1046         m = tipc_media_find(name);
1047         if (!m) {
1048                 rtnl_unlock();
1049                 return -EINVAL;
1050         }
1051
1052         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1053                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1054
1055                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1056                                               props);
1057                 if (err) {
1058                         rtnl_unlock();
1059                         return err;
1060                 }
1061
1062                 if (props[TIPC_NLA_PROP_TOL])
1063                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1064                 if (props[TIPC_NLA_PROP_PRIO])
1065                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1066                 if (props[TIPC_NLA_PROP_WIN])
1067                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1068         }
1069         rtnl_unlock();
1070
1071         return 0;
1072 }