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
  44 #define MAX_ADDR_STR 60
  45
  46 static struct tipc_media * const media_info_array[] = {
  47         &eth_media_info,
  48 #ifdef CONFIG_TIPC_MEDIA_IB
  49         &ib_media_info,
  50 #endif
  51 #ifdef CONFIG_TIPC_MEDIA_UDP
  52         &udp_media_info,
  53 #endif
  54         NULL
  55 };
  56
  57 static const struct nla_policy
  58 tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1]  = {
  59         [TIPC_NLA_BEARER_UNSPEC]                = { .type = NLA_UNSPEC },
  60         [TIPC_NLA_BEARER_NAME] = {
  61                 .type = NLA_STRING,
  62                 .len = TIPC_MAX_BEARER_NAME
  63         },
  64         [TIPC_NLA_BEARER_PROP]                  = { .type = NLA_NESTED },
  65         [TIPC_NLA_BEARER_DOMAIN]                = { .type = NLA_U32 }
  66 };
  67
  68 static const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
  69         [TIPC_NLA_MEDIA_UNSPEC]         = { .type = NLA_UNSPEC },
  70         [TIPC_NLA_MEDIA_NAME]           = { .type = NLA_STRING },
  71         [TIPC_NLA_MEDIA_PROP]           = { .type = NLA_NESTED }
  72 };
  73
  74 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr);
  75
  76 /**
  77  * tipc_media_find - locates specified media object by name
  78  */
  79 struct tipc_media *tipc_media_find(const char *name)
  80 {
  81         u32 i;
  82
  83         for (i = 0; media_info_array[i] != NULL; i++) {
  84                 if (!strcmp(media_info_array[i]->name, name))
  85                         break;
  86         }
  87         return media_info_array[i];
  88 }
  89
  90 /**
  91  * media_find_id - locates specified media object by type identifier
  92  */
  93 static struct tipc_media *media_find_id(u8 type)
  94 {
  95         u32 i;
  96
  97         for (i = 0; media_info_array[i] != NULL; i++) {
  98                 if (media_info_array[i]->type_id == type)
  99                         break;
 100         }
 101         return media_info_array[i];
 102 }
 103
 104 /**
 105  * tipc_media_addr_printf - record media address in print buffer
 106  */
 107 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
 108 {
 109         char addr_str[MAX_ADDR_STR];
 110         struct tipc_media *m_ptr;
 111         int ret;
 112
 113         m_ptr = media_find_id(a->media_id);
 114
 115         if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
 116                 ret = scnprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
 117         else {
 118                 u32 i;
 119
 120                 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
 121                 for (i = 0; i < sizeof(a->value); i++)
 122                         ret += scnprintf(buf - ret, len + ret,
 123                                             "-%02x", a->value[i]);
 124         }
 125 }
 126
 127 /**
 128  * bearer_name_validate - validate & (optionally) deconstruct bearer name
 129  * @name: ptr to bearer name string
 130  * @name_parts: ptr to area for bearer name components (or NULL if not needed)
 131  *
 132  * Returns 1 if bearer name is valid, otherwise 0.
 133  */
 134 static int bearer_name_validate(const char *name,
 135                                 struct tipc_bearer_names *name_parts)
 136 {
 137         char name_copy[TIPC_MAX_BEARER_NAME];
 138         char *media_name;
 139         char *if_name;
 140         u32 media_len;
 141         u32 if_len;
 142
 143         /* copy bearer name & ensure length is OK */
 144         name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 145         /* need above in case non-Posix strncpy() doesn't pad with nulls */
 146         strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 147         if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 148                 return 0;
 149
 150         /* ensure all component parts of bearer name are present */
 151         media_name = name_copy;
 152         if_name = strchr(media_name, ':');
 153         if (if_name == NULL)
 154                 return 0;
 155         *(if_name++) = 0;
 156         media_len = if_name - media_name;
 157         if_len = strlen(if_name) + 1;
 158
 159         /* validate component parts of bearer name */
 160         if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 161             (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
 162                 return 0;
 163
 164         /* return bearer name components, if necessary */
 165         if (name_parts) {
 166                 strcpy(name_parts->media_name, media_name);
 167                 strcpy(name_parts->if_name, if_name);
 168         }
 169         return 1;
 170 }
 171
 172 /**
 173  * tipc_bearer_find - locates bearer object with matching bearer name
 174  */
 175 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
 176 {
 177         struct tipc_net *tn = net_generic(net, tipc_net_id);
 178         struct tipc_bearer *b_ptr;
 179         u32 i;
 180
 181         for (i = 0; i < MAX_BEARERS; i++) {
 182                 b_ptr = rtnl_dereference(tn->bearer_list[i]);
 183                 if (b_ptr && (!strcmp(b_ptr->name, name)))
 184                         return b_ptr;
 185         }
 186         return NULL;
 187 }
 188
 189 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
 190 {
 191         struct tipc_net *tn = net_generic(net, tipc_net_id);
 192         struct tipc_bearer *b_ptr;
 193
 194         rcu_read_lock();
 195         b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 196         if (b_ptr)
 197                 tipc_disc_add_dest(b_ptr->link_req);
 198         rcu_read_unlock();
 199 }
 200
 201 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
 202 {
 203         struct tipc_net *tn = net_generic(net, tipc_net_id);
 204         struct tipc_bearer *b_ptr;
 205
 206         rcu_read_lock();
 207         b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 208         if (b_ptr)
 209                 tipc_disc_remove_dest(b_ptr->link_req);
 210         rcu_read_unlock();
 211 }
 212
 213 /**
 214  * tipc_enable_bearer - enable bearer with the given name
 215  */
 216 static int tipc_enable_bearer(struct net *net, const char *name,
 217                               u32 disc_domain, u32 priority,
 218                               struct nlattr *attr[])
 219 {
 220         struct tipc_net *tn = net_generic(net, tipc_net_id);
 221         struct tipc_bearer *b_ptr;
 222         struct tipc_media *m_ptr;
 223         struct tipc_bearer_names b_names;
 224         char addr_string[16];
 225         u32 bearer_id;
 226         u32 with_this_prio;
 227         u32 i;
 228         int res = -EINVAL;
 229
 230         if (!tn->own_addr) {
 231                 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
 232                         name);
 233                 return -ENOPROTOOPT;
 234         }
 235         if (!bearer_name_validate(name, &b_names)) {
 236                 pr_warn("Bearer <%s> rejected, illegal name\n", name);
 237                 return -EINVAL;
 238         }
 239         if (tipc_addr_domain_valid(disc_domain) &&
 240             (disc_domain != tn->own_addr)) {
 241                 if (tipc_in_scope(disc_domain, tn->own_addr)) {
 242                         disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
 243                         res = 0;   /* accept any node in own cluster */
 244                 } else if (in_own_cluster_exact(net, disc_domain))
 245                         res = 0;   /* accept specified node in own cluster */
 246         }
 247         if (res) {
 248                 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
 249                         name);
 250                 return -EINVAL;
 251         }
 252         if ((priority > TIPC_MAX_LINK_PRI) &&
 253             (priority != TIPC_MEDIA_LINK_PRI)) {
 254                 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
 255                 return -EINVAL;
 256         }
 257
 258         m_ptr = tipc_media_find(b_names.media_name);
 259         if (!m_ptr) {
 260                 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
 261                         name, b_names.media_name);
 262                 return -EINVAL;
 263         }
 264
 265         if (priority == TIPC_MEDIA_LINK_PRI)
 266                 priority = m_ptr->priority;
 267
 268 restart:
 269         bearer_id = MAX_BEARERS;
 270         with_this_prio = 1;
 271         for (i = MAX_BEARERS; i-- != 0; ) {
 272                 b_ptr = rtnl_dereference(tn->bearer_list[i]);
 273                 if (!b_ptr) {
 274                         bearer_id = i;
 275                         continue;
 276                 }
 277                 if (!strcmp(name, b_ptr->name)) {
 278                         pr_warn("Bearer <%s> rejected, already enabled\n",
 279                                 name);
 280                         return -EINVAL;
 281                 }
 282                 if ((b_ptr->priority == priority) &&
 283                     (++with_this_prio > 2)) {
 284                         if (priority-- == 0) {
 285                                 pr_warn("Bearer <%s> rejected, duplicate priority\n",
 286                                         name);
 287                                 return -EINVAL;
 288                         }
 289                         pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
 290                                 name, priority + 1, priority);
 291                         goto restart;
 292                 }
 293         }
 294         if (bearer_id >= MAX_BEARERS) {
 295                 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 296                         name, MAX_BEARERS);
 297                 return -EINVAL;
 298         }
 299
 300         b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
 301         if (!b_ptr)
 302                 return -ENOMEM;
 303
 304         strcpy(b_ptr->name, name);
 305         b_ptr->media = m_ptr;
 306         res = m_ptr->enable_media(net, b_ptr, attr);
 307         if (res) {
 308                 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
 309                         name, -res);
 310                 return -EINVAL;
 311         }
 312
 313         b_ptr->identity = bearer_id;
 314         b_ptr->tolerance = m_ptr->tolerance;
 315         b_ptr->window = m_ptr->window;
 316         b_ptr->domain = disc_domain;
 317         b_ptr->net_plane = bearer_id + 'A';
 318         b_ptr->priority = priority;
 319
 320         res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr);
 321         if (res) {
 322                 bearer_disable(net, b_ptr);
 323                 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
 324                         name);
 325                 return -EINVAL;
 326         }
 327
 328         rcu_assign_pointer(tn->bearer_list[bearer_id], b_ptr);
 329
 330         pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 331                 name,
 332                 tipc_addr_string_fill(addr_string, disc_domain), priority);
 333         return res;
 334 }
 335
 336 /**
 337  * tipc_reset_bearer - Reset all links established over this bearer
 338  */
 339 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr)
 340 {
 341         pr_info("Resetting bearer <%s>\n", b_ptr->name);
 342         tipc_node_delete_links(net, b_ptr->identity);
 343         tipc_disc_reset(net, b_ptr);
 344         return 0;
 345 }
 346
 347 /**
 348  * bearer_disable
 349  *
 350  * Note: This routine assumes caller holds RTNL lock.
 351  */
 352 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr)
 353 {
 354         struct tipc_net *tn = net_generic(net, tipc_net_id);
 355         u32 i;
 356
 357         pr_info("Disabling bearer <%s>\n", b_ptr->name);
 358         b_ptr->media->disable_media(b_ptr);
 359
 360         tipc_node_delete_links(net, b_ptr->identity);
 361         RCU_INIT_POINTER(b_ptr->media_ptr, NULL);
 362         if (b_ptr->link_req)
 363                 tipc_disc_delete(b_ptr->link_req);
 364
 365         for (i = 0; i < MAX_BEARERS; i++) {
 366                 if (b_ptr == rtnl_dereference(tn->bearer_list[i])) {
 367                         RCU_INIT_POINTER(tn->bearer_list[i], NULL);
 368                         break;
 369                 }
 370         }
 371         kfree_rcu(b_ptr, rcu);
 372 }
 373
 374 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 375                          struct nlattr *attr[])
 376 {
 377         struct net_device *dev;
 378         char *driver_name = strchr((const char *)b->name, ':') + 1;
 379
 380         /* Find device with specified name */
 381         dev = dev_get_by_name(net, driver_name);
 382         if (!dev)
 383                 return -ENODEV;
 384         if (tipc_mtu_bad(dev, 0)) {
 385                 dev_put(dev);
 386                 return -EINVAL;
 387         }
 388
 389         /* Associate TIPC bearer with L2 bearer */
 390         rcu_assign_pointer(b->media_ptr, dev);
 391         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 392         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 393         b->bcast_addr.media_id = b->media->type_id;
 394         b->bcast_addr.broadcast = 1;
 395         b->mtu = dev->mtu;
 396         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 397         rcu_assign_pointer(dev->tipc_ptr, b);
 398         return 0;
 399 }
 400
 401 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 402  *
 403  * Mark L2 bearer as inactive so that incoming buffers are thrown away
 404  */
 405 void tipc_disable_l2_media(struct tipc_bearer *b)
 406 {
 407         struct net_device *dev;
 408
 409         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 410         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 411         synchronize_net();
 412         dev_put(dev);
 413 }
 414
 415 /**
 416  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 417  * @buf: the packet to be sent
 418  * @b_ptr: the bearer through which the packet is to be sent
 419  * @dest: peer destination address
 420  */
 421 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
 422                      struct tipc_bearer *b, struct tipc_media_addr *dest)
 423 {
 424         struct net_device *dev;
 425         int delta;
 426
 427         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
 428         if (!dev)
 429                 return 0;
 430
 431         delta = dev->hard_header_len - skb_headroom(skb);
 432         if ((delta > 0) &&
 433             pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
 434                 kfree_skb(skb);
 435                 return 0;
 436         }
 437
 438         skb_reset_network_header(skb);
 439         skb->dev = dev;
 440         skb->protocol = htons(ETH_P_TIPC);
 441         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
 442                         dev->dev_addr, skb->len);
 443         dev_queue_xmit(skb);
 444         return 0;
 445 }
 446
 447 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
 448 {
 449         int mtu = 0;
 450         struct tipc_bearer *b;
 451
 452         rcu_read_lock();
 453         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
 454         if (b)
 455                 mtu = b->mtu;
 456         rcu_read_unlock();
 457         return mtu;
 458 }
 459
 460 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
 461  */
 462 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
 463                           struct sk_buff *skb,
 464                           struct tipc_media_addr *dest)
 465 {
 466         struct tipc_net *tn = tipc_net(net);
 467         struct tipc_bearer *b;
 468
 469         rcu_read_lock();
 470         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 471         if (likely(b))
 472                 b->media->send_msg(net, skb, b, dest);
 473         rcu_read_unlock();
 474 }
 475
 476 /* tipc_bearer_xmit() -send buffer to destination over bearer
 477  */
 478 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
 479                       struct sk_buff_head *xmitq,
 480                       struct tipc_media_addr *dst)
 481 {
 482         struct tipc_net *tn = net_generic(net, tipc_net_id);
 483         struct tipc_bearer *b;
 484         struct sk_buff *skb, *tmp;
 485
 486         if (skb_queue_empty(xmitq))
 487                 return;
 488
 489         rcu_read_lock();
 490         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 491         if (likely(b)) {
 492                 skb_queue_walk_safe(xmitq, skb, tmp) {
 493                         __skb_dequeue(xmitq);
 494                         b->media->send_msg(net, skb, b, dst);
 495                 }
 496         }
 497         rcu_read_unlock();
 498 }
 499
 500 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
 501  */
 502 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
 503                          struct sk_buff_head *xmitq)
 504 {
 505         struct tipc_net *tn = tipc_net(net);
 506         int net_id = tn->net_id;
 507         struct tipc_bearer *b;
 508         struct sk_buff *skb, *tmp;
 509         struct tipc_msg *hdr;
 510
 511         rcu_read_lock();
 512         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 513         if (likely(b)) {
 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         }
 522         rcu_read_unlock();
 523 }
 524
 525 /**
 526  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 527  * @buf: the received packet
 528  * @dev: the net device that the packet was received on
 529  * @pt: the packet_type structure which was used to register this handler
 530  * @orig_dev: the original receive net device in case the device is a bond
 531  *
 532  * Accept only packets explicitly sent to this node, or broadcast packets;
 533  * ignores packets sent using interface multicast, and traffic sent to other
 534  * nodes (which can happen if interface is running in promiscuous mode).
 535  */
 536 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
 537                            struct packet_type *pt, struct net_device *orig_dev)
 538 {
 539         struct tipc_bearer *b_ptr;
 540
 541         rcu_read_lock();
 542         b_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
 543         if (likely(b_ptr)) {
 544                 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
 545                         buf->next = NULL;
 546                         tipc_rcv(dev_net(dev), buf, b_ptr);
 547                         rcu_read_unlock();
 548                         return NET_RX_SUCCESS;
 549                 }
 550         }
 551         rcu_read_unlock();
 552
 553         kfree_skb(buf);
 554         return NET_RX_DROP;
 555 }
 556
 557 /**
 558  * tipc_l2_device_event - handle device events from network device
 559  * @nb: the context of the notification
 560  * @evt: the type of event
 561  * @ptr: the net device that the event was on
 562  *
 563  * This function is called by the Ethernet driver in case of link
 564  * change event.
 565  */
 566 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 567                                 void *ptr)
 568 {
 569         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 570         struct net *net = dev_net(dev);
 571         struct tipc_bearer *b_ptr;
 572
 573         b_ptr = rtnl_dereference(dev->tipc_ptr);
 574         if (!b_ptr)
 575                 return NOTIFY_DONE;
 576
 577         switch (evt) {
 578         case NETDEV_CHANGE:
 579                 if (netif_carrier_ok(dev))
 580                         break;
 581         case NETDEV_GOING_DOWN:
 582                 tipc_reset_bearer(net, b_ptr);
 583                 break;
 584         case NETDEV_CHANGEMTU:
 585                 if (tipc_mtu_bad(dev, 0)) {
 586                         bearer_disable(net, b_ptr);
 587                         break;
 588                 }
 589                 b_ptr->mtu = dev->mtu;
 590                 tipc_reset_bearer(net, b_ptr);
 591                 break;
 592         case NETDEV_CHANGEADDR:
 593                 b_ptr->media->raw2addr(b_ptr, &b_ptr->addr,
 594                                        (char *)dev->dev_addr);
 595                 tipc_reset_bearer(net, b_ptr);
 596                 break;
 597         case NETDEV_UNREGISTER:
 598         case NETDEV_CHANGENAME:
 599                 bearer_disable(dev_net(dev), b_ptr);
 600                 break;
 601         }
 602         return NOTIFY_OK;
 603 }
 604
 605 static struct packet_type tipc_packet_type __read_mostly = {
 606         .type = htons(ETH_P_TIPC),
 607         .func = tipc_l2_rcv_msg,
 608 };
 609
 610 static struct notifier_block notifier = {
 611         .notifier_call  = tipc_l2_device_event,
 612         .priority       = 0,
 613 };
 614
 615 int tipc_bearer_setup(void)
 616 {
 617         int err;
 618
 619         err = register_netdevice_notifier(&notifier);
 620         if (err)
 621                 return err;
 622         dev_add_pack(&tipc_packet_type);
 623         return 0;
 624 }
 625
 626 void tipc_bearer_cleanup(void)
 627 {
 628         unregister_netdevice_notifier(&notifier);
 629         dev_remove_pack(&tipc_packet_type);
 630 }
 631
 632 void tipc_bearer_stop(struct net *net)
 633 {
 634         struct tipc_net *tn = net_generic(net, tipc_net_id);
 635         struct tipc_bearer *b_ptr;
 636         u32 i;
 637
 638         for (i = 0; i < MAX_BEARERS; i++) {
 639                 b_ptr = rtnl_dereference(tn->bearer_list[i]);
 640                 if (b_ptr) {
 641                         bearer_disable(net, b_ptr);
 642                         tn->bearer_list[i] = NULL;
 643                 }
 644         }
 645 }
 646
 647 /* Caller should hold rtnl_lock to protect the bearer */
 648 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 649                                 struct tipc_bearer *bearer, int nlflags)
 650 {
 651         void *hdr;
 652         struct nlattr *attrs;
 653         struct nlattr *prop;
 654
 655         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 656                           nlflags, TIPC_NL_BEARER_GET);
 657         if (!hdr)
 658                 return -EMSGSIZE;
 659
 660         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
 661         if (!attrs)
 662                 goto msg_full;
 663
 664         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 665                 goto attr_msg_full;
 666
 667         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
 668         if (!prop)
 669                 goto prop_msg_full;
 670         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 671                 goto prop_msg_full;
 672         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 673                 goto prop_msg_full;
 674         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 675                 goto prop_msg_full;
 676
 677         nla_nest_end(msg->skb, prop);
 678         nla_nest_end(msg->skb, attrs);
 679         genlmsg_end(msg->skb, hdr);
 680
 681         return 0;
 682
 683 prop_msg_full:
 684         nla_nest_cancel(msg->skb, prop);
 685 attr_msg_full:
 686         nla_nest_cancel(msg->skb, attrs);
 687 msg_full:
 688         genlmsg_cancel(msg->skb, hdr);
 689
 690         return -EMSGSIZE;
 691 }
 692
 693 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 694 {
 695         int err;
 696         int i = cb->args[0];
 697         struct tipc_bearer *bearer;
 698         struct tipc_nl_msg msg;
 699         struct net *net = sock_net(skb->sk);
 700         struct tipc_net *tn = net_generic(net, tipc_net_id);
 701
 702         if (i == MAX_BEARERS)
 703                 return 0;
 704
 705         msg.skb = skb;
 706         msg.portid = NETLINK_CB(cb->skb).portid;
 707         msg.seq = cb->nlh->nlmsg_seq;
 708
 709         rtnl_lock();
 710         for (i = 0; i < MAX_BEARERS; i++) {
 711                 bearer = rtnl_dereference(tn->bearer_list[i]);
 712                 if (!bearer)
 713                         continue;
 714
 715                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
 716                 if (err)
 717                         break;
 718         }
 719         rtnl_unlock();
 720
 721         cb->args[0] = i;
 722         return skb->len;
 723 }
 724
 725 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 726 {
 727         int err;
 728         char *name;
 729         struct sk_buff *rep;
 730         struct tipc_bearer *bearer;
 731         struct tipc_nl_msg msg;
 732         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 733         struct net *net = genl_info_net(info);
 734
 735         if (!info->attrs[TIPC_NLA_BEARER])
 736                 return -EINVAL;
 737
 738         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 739                                info->attrs[TIPC_NLA_BEARER],
 740                                tipc_nl_bearer_policy);
 741         if (err)
 742                 return err;
 743
 744         if (!attrs[TIPC_NLA_BEARER_NAME])
 745                 return -EINVAL;
 746         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 747
 748         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 749         if (!rep)
 750                 return -ENOMEM;
 751
 752         msg.skb = rep;
 753         msg.portid = info->snd_portid;
 754         msg.seq = info->snd_seq;
 755
 756         rtnl_lock();
 757         bearer = tipc_bearer_find(net, name);
 758         if (!bearer) {
 759                 err = -EINVAL;
 760                 goto err_out;
 761         }
 762
 763         err = __tipc_nl_add_bearer(&msg, bearer, 0);
 764         if (err)
 765                 goto err_out;
 766         rtnl_unlock();
 767
 768         return genlmsg_reply(rep, info);
 769 err_out:
 770         rtnl_unlock();
 771         nlmsg_free(rep);
 772
 773         return err;
 774 }
 775
 776 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 777 {
 778         int err;
 779         char *name;
 780         struct tipc_bearer *bearer;
 781         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 782         struct net *net = sock_net(skb->sk);
 783
 784         if (!info->attrs[TIPC_NLA_BEARER])
 785                 return -EINVAL;
 786
 787         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 788                                info->attrs[TIPC_NLA_BEARER],
 789                                tipc_nl_bearer_policy);
 790         if (err)
 791                 return err;
 792
 793         if (!attrs[TIPC_NLA_BEARER_NAME])
 794                 return -EINVAL;
 795
 796         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 797
 798         rtnl_lock();
 799         bearer = tipc_bearer_find(net, name);
 800         if (!bearer) {
 801                 rtnl_unlock();
 802                 return -EINVAL;
 803         }
 804
 805         bearer_disable(net, bearer);
 806         rtnl_unlock();
 807
 808         return 0;
 809 }
 810
 811 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 812 {
 813         int err;
 814         char *bearer;
 815         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 816         struct net *net = sock_net(skb->sk);
 817         struct tipc_net *tn = net_generic(net, tipc_net_id);
 818         u32 domain;
 819         u32 prio;
 820
 821         prio = TIPC_MEDIA_LINK_PRI;
 822         domain = tn->own_addr & TIPC_CLUSTER_MASK;
 823
 824         if (!info->attrs[TIPC_NLA_BEARER])
 825                 return -EINVAL;
 826
 827         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 828                                info->attrs[TIPC_NLA_BEARER],
 829                                tipc_nl_bearer_policy);
 830         if (err)
 831                 return err;
 832
 833         if (!attrs[TIPC_NLA_BEARER_NAME])
 834                 return -EINVAL;
 835
 836         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 837
 838         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 839                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 840
 841         if (attrs[TIPC_NLA_BEARER_PROP]) {
 842                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 843
 844                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 845                                               props);
 846                 if (err)
 847                         return err;
 848
 849                 if (props[TIPC_NLA_PROP_PRIO])
 850                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 851         }
 852
 853         rtnl_lock();
 854         err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
 855         if (err) {
 856                 rtnl_unlock();
 857                 return err;
 858         }
 859         rtnl_unlock();
 860
 861         return 0;
 862 }
 863
 864 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 865 {
 866         int err;
 867         char *name;
 868         struct tipc_bearer *b;
 869         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 870         struct net *net = sock_net(skb->sk);
 871
 872         if (!info->attrs[TIPC_NLA_BEARER])
 873                 return -EINVAL;
 874
 875         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 876                                info->attrs[TIPC_NLA_BEARER],
 877                                tipc_nl_bearer_policy);
 878         if (err)
 879                 return err;
 880
 881         if (!attrs[TIPC_NLA_BEARER_NAME])
 882                 return -EINVAL;
 883         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 884
 885         rtnl_lock();
 886         b = tipc_bearer_find(net, name);
 887         if (!b) {
 888                 rtnl_unlock();
 889                 return -EINVAL;
 890         }
 891
 892         if (attrs[TIPC_NLA_BEARER_PROP]) {
 893                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 894
 895                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 896                                               props);
 897                 if (err) {
 898                         rtnl_unlock();
 899                         return err;
 900                 }
 901
 902                 if (props[TIPC_NLA_PROP_TOL])
 903                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
 904                 if (props[TIPC_NLA_PROP_PRIO])
 905                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 906                 if (props[TIPC_NLA_PROP_WIN])
 907                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
 908         }
 909         rtnl_unlock();
 910
 911         return 0;
 912 }
 913
 914 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
 915                                struct tipc_media *media, int nlflags)
 916 {
 917         void *hdr;
 918         struct nlattr *attrs;
 919         struct nlattr *prop;
 920
 921         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 922                           nlflags, TIPC_NL_MEDIA_GET);
 923         if (!hdr)
 924                 return -EMSGSIZE;
 925
 926         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
 927         if (!attrs)
 928                 goto msg_full;
 929
 930         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
 931                 goto attr_msg_full;
 932
 933         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
 934         if (!prop)
 935                 goto prop_msg_full;
 936         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
 937                 goto prop_msg_full;
 938         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
 939                 goto prop_msg_full;
 940         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
 941                 goto prop_msg_full;
 942
 943         nla_nest_end(msg->skb, prop);
 944         nla_nest_end(msg->skb, attrs);
 945         genlmsg_end(msg->skb, hdr);
 946
 947         return 0;
 948
 949 prop_msg_full:
 950         nla_nest_cancel(msg->skb, prop);
 951 attr_msg_full:
 952         nla_nest_cancel(msg->skb, attrs);
 953 msg_full:
 954         genlmsg_cancel(msg->skb, hdr);
 955
 956         return -EMSGSIZE;
 957 }
 958
 959 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
 960 {
 961         int err;
 962         int i = cb->args[0];
 963         struct tipc_nl_msg msg;
 964
 965         if (i == MAX_MEDIA)
 966                 return 0;
 967
 968         msg.skb = skb;
 969         msg.portid = NETLINK_CB(cb->skb).portid;
 970         msg.seq = cb->nlh->nlmsg_seq;
 971
 972         rtnl_lock();
 973         for (; media_info_array[i] != NULL; i++) {
 974                 err = __tipc_nl_add_media(&msg, media_info_array[i],
 975                                           NLM_F_MULTI);
 976                 if (err)
 977                         break;
 978         }
 979         rtnl_unlock();
 980
 981         cb->args[0] = i;
 982         return skb->len;
 983 }
 984
 985 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 986 {
 987         int err;
 988         char *name;
 989         struct tipc_nl_msg msg;
 990         struct tipc_media *media;
 991         struct sk_buff *rep;
 992         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 993
 994         if (!info->attrs[TIPC_NLA_MEDIA])
 995                 return -EINVAL;
 996
 997         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
 998                                info->attrs[TIPC_NLA_MEDIA],
 999                                tipc_nl_media_policy);
1000         if (err)
1001                 return err;
1002
1003         if (!attrs[TIPC_NLA_MEDIA_NAME])
1004                 return -EINVAL;
1005         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1006
1007         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1008         if (!rep)
1009                 return -ENOMEM;
1010
1011         msg.skb = rep;
1012         msg.portid = info->snd_portid;
1013         msg.seq = info->snd_seq;
1014
1015         rtnl_lock();
1016         media = tipc_media_find(name);
1017         if (!media) {
1018                 err = -EINVAL;
1019                 goto err_out;
1020         }
1021
1022         err = __tipc_nl_add_media(&msg, media, 0);
1023         if (err)
1024                 goto err_out;
1025         rtnl_unlock();
1026
1027         return genlmsg_reply(rep, info);
1028 err_out:
1029         rtnl_unlock();
1030         nlmsg_free(rep);
1031
1032         return err;
1033 }
1034
1035 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1036 {
1037         int err;
1038         char *name;
1039         struct tipc_media *m;
1040         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1041
1042         if (!info->attrs[TIPC_NLA_MEDIA])
1043                 return -EINVAL;
1044
1045         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1046                                info->attrs[TIPC_NLA_MEDIA],
1047                                tipc_nl_media_policy);
1048
1049         if (!attrs[TIPC_NLA_MEDIA_NAME])
1050                 return -EINVAL;
1051         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1052
1053         rtnl_lock();
1054         m = tipc_media_find(name);
1055         if (!m) {
1056                 rtnl_unlock();
1057                 return -EINVAL;
1058         }
1059
1060         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1061                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1062
1063                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1064                                               props);
1065                 if (err) {
1066                         rtnl_unlock();
1067                         return err;
1068                 }
1069
1070                 if (props[TIPC_NLA_PROP_TOL])
1071                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1072                 if (props[TIPC_NLA_PROP_PRIO])
1073                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1074                 if (props[TIPC_NLA_PROP_WIN])
1075                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1076         }
1077         rtnl_unlock();
1078
1079         return 0;
1080 }