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         char addr_string[16];
 209         u32 bearer_id;
 210         u32 with_this_prio;
 211         u32 i;
 212         int res = -EINVAL;
 213
 214         if (!tn->own_addr) {
 215                 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
 216                         name);
 217                 return -ENOPROTOOPT;
 218         }
 219         if (!bearer_name_validate(name, &b_names)) {
 220                 pr_warn("Bearer <%s> rejected, illegal name\n", name);
 221                 return -EINVAL;
 222         }
 223         if (tipc_addr_domain_valid(disc_domain) &&
 224             (disc_domain != tn->own_addr)) {
 225                 if (tipc_in_scope(disc_domain, tn->own_addr)) {
 226                         disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
 227                         res = 0;   /* accept any node in own cluster */
 228                 } else if (in_own_cluster_exact(net, disc_domain))
 229                         res = 0;   /* accept specified node in own cluster */
 230         }
 231         if (res) {
 232                 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
 233                         name);
 234                 return -EINVAL;
 235         }
 236         if ((priority > TIPC_MAX_LINK_PRI) &&
 237             (priority != TIPC_MEDIA_LINK_PRI)) {
 238                 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
 239                 return -EINVAL;
 240         }
 241
 242         m = tipc_media_find(b_names.media_name);
 243         if (!m) {
 244                 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
 245                         name, b_names.media_name);
 246                 return -EINVAL;
 247         }
 248
 249         if (priority == TIPC_MEDIA_LINK_PRI)
 250                 priority = m->priority;
 251
 252 restart:
 253         bearer_id = MAX_BEARERS;
 254         with_this_prio = 1;
 255         for (i = MAX_BEARERS; i-- != 0; ) {
 256                 b = rtnl_dereference(tn->bearer_list[i]);
 257                 if (!b) {
 258                         bearer_id = i;
 259                         continue;
 260                 }
 261                 if (!strcmp(name, b->name)) {
 262                         pr_warn("Bearer <%s> rejected, already enabled\n",
 263                                 name);
 264                         return -EINVAL;
 265                 }
 266                 if ((b->priority == priority) &&
 267                     (++with_this_prio > 2)) {
 268                         if (priority-- == 0) {
 269                                 pr_warn("Bearer <%s> rejected, duplicate priority\n",
 270                                         name);
 271                                 return -EINVAL;
 272                         }
 273                         pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
 274                                 name, priority + 1, priority);
 275                         goto restart;
 276                 }
 277         }
 278         if (bearer_id >= MAX_BEARERS) {
 279                 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 280                         name, MAX_BEARERS);
 281                 return -EINVAL;
 282         }
 283
 284         b = kzalloc(sizeof(*b), GFP_ATOMIC);
 285         if (!b)
 286                 return -ENOMEM;
 287
 288         strcpy(b->name, name);
 289         b->media = m;
 290         res = m->enable_media(net, b, attr);
 291         if (res) {
 292                 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
 293                         name, -res);
 294                 return -EINVAL;
 295         }
 296
 297         b->identity = bearer_id;
 298         b->tolerance = m->tolerance;
 299         b->window = m->window;
 300         b->domain = disc_domain;
 301         b->net_plane = bearer_id + 'A';
 302         b->priority = priority;
 303
 304         res = tipc_disc_create(net, b, &b->bcast_addr);
 305         if (res) {
 306                 bearer_disable(net, b);
 307                 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
 308                         name);
 309                 return -EINVAL;
 310         }
 311
 312         rcu_assign_pointer(tn->bearer_list[bearer_id], b);
 313
 314         pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 315                 name,
 316                 tipc_addr_string_fill(addr_string, disc_domain), priority);
 317         return res;
 318 }
 319
 320 /**
 321  * tipc_reset_bearer - Reset all links established over this bearer
 322  */
 323 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
 324 {
 325         pr_info("Resetting bearer <%s>\n", b->name);
 326         tipc_node_delete_links(net, b->identity);
 327         tipc_disc_reset(net, b);
 328         return 0;
 329 }
 330
 331 /**
 332  * bearer_disable
 333  *
 334  * Note: This routine assumes caller holds RTNL lock.
 335  */
 336 static void bearer_disable(struct net *net, struct tipc_bearer *b)
 337 {
 338         struct tipc_net *tn = net_generic(net, tipc_net_id);
 339         u32 i;
 340
 341         pr_info("Disabling bearer <%s>\n", b->name);
 342         b->media->disable_media(b);
 343
 344         tipc_node_delete_links(net, b->identity);
 345         RCU_INIT_POINTER(b->media_ptr, NULL);
 346         if (b->link_req)
 347                 tipc_disc_delete(b->link_req);
 348
 349         for (i = 0; i < MAX_BEARERS; i++) {
 350                 if (b == rtnl_dereference(tn->bearer_list[i])) {
 351                         RCU_INIT_POINTER(tn->bearer_list[i], NULL);
 352                         break;
 353                 }
 354         }
 355         kfree_rcu(b, rcu);
 356 }
 357
 358 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 359                          struct nlattr *attr[])
 360 {
 361         struct net_device *dev;
 362         char *driver_name = strchr((const char *)b->name, ':') + 1;
 363
 364         /* Find device with specified name */
 365         dev = dev_get_by_name(net, driver_name);
 366         if (!dev)
 367                 return -ENODEV;
 368
 369         /* Associate TIPC bearer with L2 bearer */
 370         rcu_assign_pointer(b->media_ptr, dev);
 371         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 372         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 373         b->bcast_addr.media_id = b->media->type_id;
 374         b->bcast_addr.broadcast = 1;
 375         b->mtu = dev->mtu;
 376         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 377         rcu_assign_pointer(dev->tipc_ptr, b);
 378         return 0;
 379 }
 380
 381 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 382  *
 383  * Mark L2 bearer as inactive so that incoming buffers are thrown away
 384  */
 385 void tipc_disable_l2_media(struct tipc_bearer *b)
 386 {
 387         struct net_device *dev;
 388
 389         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 390         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 391         synchronize_net();
 392         dev_put(dev);
 393 }
 394
 395 /**
 396  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 397  * @buf: the packet to be sent
 398  * @b: the bearer through which the packet is to be sent
 399  * @dest: peer destination address
 400  */
 401 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
 402                      struct tipc_bearer *b, struct tipc_media_addr *dest)
 403 {
 404         struct net_device *dev;
 405         int delta;
 406
 407         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
 408         if (!dev)
 409                 return 0;
 410
 411         delta = dev->hard_header_len - skb_headroom(skb);
 412         if ((delta > 0) &&
 413             pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
 414                 kfree_skb(skb);
 415                 return 0;
 416         }
 417
 418         skb_reset_network_header(skb);
 419         skb->dev = dev;
 420         skb->protocol = htons(ETH_P_TIPC);
 421         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
 422                         dev->dev_addr, skb->len);
 423         dev_queue_xmit(skb);
 424         return 0;
 425 }
 426
 427 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
 428 {
 429         int mtu = 0;
 430         struct tipc_bearer *b;
 431
 432         rcu_read_lock();
 433         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
 434         if (b)
 435                 mtu = b->mtu;
 436         rcu_read_unlock();
 437         return mtu;
 438 }
 439
 440 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
 441  */
 442 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
 443                           struct sk_buff *skb,
 444                           struct tipc_media_addr *dest)
 445 {
 446         struct tipc_net *tn = tipc_net(net);
 447         struct tipc_bearer *b;
 448
 449         rcu_read_lock();
 450         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 451         if (likely(b))
 452                 b->media->send_msg(net, skb, b, dest);
 453         rcu_read_unlock();
 454 }
 455
 456 /* tipc_bearer_xmit() -send buffer to destination over bearer
 457  */
 458 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
 459                       struct sk_buff_head *xmitq,
 460                       struct tipc_media_addr *dst)
 461 {
 462         struct tipc_net *tn = net_generic(net, tipc_net_id);
 463         struct tipc_bearer *b;
 464         struct sk_buff *skb, *tmp;
 465
 466         if (skb_queue_empty(xmitq))
 467                 return;
 468
 469         rcu_read_lock();
 470         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 471         if (likely(b)) {
 472                 skb_queue_walk_safe(xmitq, skb, tmp) {
 473                         __skb_dequeue(xmitq);
 474                         b->media->send_msg(net, skb, b, dst);
 475                 }
 476         }
 477         rcu_read_unlock();
 478 }
 479
 480 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
 481  */
 482 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
 483                          struct sk_buff_head *xmitq)
 484 {
 485         struct tipc_net *tn = tipc_net(net);
 486         int net_id = tn->net_id;
 487         struct tipc_bearer *b;
 488         struct sk_buff *skb, *tmp;
 489         struct tipc_msg *hdr;
 490
 491         rcu_read_lock();
 492         b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 493         if (likely(b)) {
 494                 skb_queue_walk_safe(xmitq, skb, tmp) {
 495                         hdr = buf_msg(skb);
 496                         msg_set_non_seq(hdr, 1);
 497                         msg_set_mc_netid(hdr, net_id);
 498                         __skb_dequeue(xmitq);
 499                         b->media->send_msg(net, skb, b, &b->bcast_addr);
 500                 }
 501         }
 502         rcu_read_unlock();
 503 }
 504
 505 /**
 506  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 507  * @buf: the received packet
 508  * @dev: the net device that the packet was received on
 509  * @pt: the packet_type structure which was used to register this handler
 510  * @orig_dev: the original receive net device in case the device is a bond
 511  *
 512  * Accept only packets explicitly sent to this node, or broadcast packets;
 513  * ignores packets sent using interface multicast, and traffic sent to other
 514  * nodes (which can happen if interface is running in promiscuous mode).
 515  */
 516 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
 517                            struct packet_type *pt, struct net_device *orig_dev)
 518 {
 519         struct tipc_bearer *b;
 520
 521         rcu_read_lock();
 522         b = rcu_dereference_rtnl(dev->tipc_ptr);
 523         if (likely(b)) {
 524                 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
 525                         buf->next = NULL;
 526                         tipc_rcv(dev_net(dev), buf, b);
 527                         rcu_read_unlock();
 528                         return NET_RX_SUCCESS;
 529                 }
 530         }
 531         rcu_read_unlock();
 532
 533         kfree_skb(buf);
 534         return NET_RX_DROP;
 535 }
 536
 537 /**
 538  * tipc_l2_device_event - handle device events from network device
 539  * @nb: the context of the notification
 540  * @evt: the type of event
 541  * @ptr: the net device that the event was on
 542  *
 543  * This function is called by the Ethernet driver in case of link
 544  * change event.
 545  */
 546 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 547                                 void *ptr)
 548 {
 549         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 550         struct net *net = dev_net(dev);
 551         struct tipc_bearer *b;
 552
 553         b = rtnl_dereference(dev->tipc_ptr);
 554         if (!b)
 555                 return NOTIFY_DONE;
 556
 557         b->mtu = dev->mtu;
 558
 559         switch (evt) {
 560         case NETDEV_CHANGE:
 561                 if (netif_carrier_ok(dev))
 562                         break;
 563         case NETDEV_GOING_DOWN:
 564         case NETDEV_CHANGEMTU:
 565                 tipc_reset_bearer(net, b);
 566                 break;
 567         case NETDEV_CHANGEADDR:
 568                 b->media->raw2addr(b, &b->addr,
 569                                        (char *)dev->dev_addr);
 570                 tipc_reset_bearer(net, b);
 571                 break;
 572         case NETDEV_UNREGISTER:
 573         case NETDEV_CHANGENAME:
 574                 bearer_disable(dev_net(dev), b);
 575                 break;
 576         }
 577         return NOTIFY_OK;
 578 }
 579
 580 static struct packet_type tipc_packet_type __read_mostly = {
 581         .type = htons(ETH_P_TIPC),
 582         .func = tipc_l2_rcv_msg,
 583 };
 584
 585 static struct notifier_block notifier = {
 586         .notifier_call  = tipc_l2_device_event,
 587         .priority       = 0,
 588 };
 589
 590 int tipc_bearer_setup(void)
 591 {
 592         int err;
 593
 594         err = register_netdevice_notifier(&notifier);
 595         if (err)
 596                 return err;
 597         dev_add_pack(&tipc_packet_type);
 598         return 0;
 599 }
 600
 601 void tipc_bearer_cleanup(void)
 602 {
 603         unregister_netdevice_notifier(&notifier);
 604         dev_remove_pack(&tipc_packet_type);
 605 }
 606
 607 void tipc_bearer_stop(struct net *net)
 608 {
 609         struct tipc_net *tn = net_generic(net, tipc_net_id);
 610         struct tipc_bearer *b;
 611         u32 i;
 612
 613         for (i = 0; i < MAX_BEARERS; i++) {
 614                 b = rtnl_dereference(tn->bearer_list[i]);
 615                 if (b) {
 616                         bearer_disable(net, b);
 617                         tn->bearer_list[i] = NULL;
 618                 }
 619         }
 620 }
 621
 622 /* Caller should hold rtnl_lock to protect the bearer */
 623 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 624                                 struct tipc_bearer *bearer, int nlflags)
 625 {
 626         void *hdr;
 627         struct nlattr *attrs;
 628         struct nlattr *prop;
 629
 630         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 631                           nlflags, TIPC_NL_BEARER_GET);
 632         if (!hdr)
 633                 return -EMSGSIZE;
 634
 635         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
 636         if (!attrs)
 637                 goto msg_full;
 638
 639         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 640                 goto attr_msg_full;
 641
 642         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
 643         if (!prop)
 644                 goto prop_msg_full;
 645         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 646                 goto prop_msg_full;
 647         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 648                 goto prop_msg_full;
 649         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 650                 goto prop_msg_full;
 651
 652         nla_nest_end(msg->skb, prop);
 653         nla_nest_end(msg->skb, attrs);
 654         genlmsg_end(msg->skb, hdr);
 655
 656         return 0;
 657
 658 prop_msg_full:
 659         nla_nest_cancel(msg->skb, prop);
 660 attr_msg_full:
 661         nla_nest_cancel(msg->skb, attrs);
 662 msg_full:
 663         genlmsg_cancel(msg->skb, hdr);
 664
 665         return -EMSGSIZE;
 666 }
 667
 668 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 669 {
 670         int err;
 671         int i = cb->args[0];
 672         struct tipc_bearer *bearer;
 673         struct tipc_nl_msg msg;
 674         struct net *net = sock_net(skb->sk);
 675         struct tipc_net *tn = net_generic(net, tipc_net_id);
 676
 677         if (i == MAX_BEARERS)
 678                 return 0;
 679
 680         msg.skb = skb;
 681         msg.portid = NETLINK_CB(cb->skb).portid;
 682         msg.seq = cb->nlh->nlmsg_seq;
 683
 684         rtnl_lock();
 685         for (i = 0; i < MAX_BEARERS; i++) {
 686                 bearer = rtnl_dereference(tn->bearer_list[i]);
 687                 if (!bearer)
 688                         continue;
 689
 690                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
 691                 if (err)
 692                         break;
 693         }
 694         rtnl_unlock();
 695
 696         cb->args[0] = i;
 697         return skb->len;
 698 }
 699
 700 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 701 {
 702         int err;
 703         char *name;
 704         struct sk_buff *rep;
 705         struct tipc_bearer *bearer;
 706         struct tipc_nl_msg msg;
 707         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 708         struct net *net = genl_info_net(info);
 709
 710         if (!info->attrs[TIPC_NLA_BEARER])
 711                 return -EINVAL;
 712
 713         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 714                                info->attrs[TIPC_NLA_BEARER],
 715                                tipc_nl_bearer_policy);
 716         if (err)
 717                 return err;
 718
 719         if (!attrs[TIPC_NLA_BEARER_NAME])
 720                 return -EINVAL;
 721         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 722
 723         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 724         if (!rep)
 725                 return -ENOMEM;
 726
 727         msg.skb = rep;
 728         msg.portid = info->snd_portid;
 729         msg.seq = info->snd_seq;
 730
 731         rtnl_lock();
 732         bearer = tipc_bearer_find(net, name);
 733         if (!bearer) {
 734                 err = -EINVAL;
 735                 goto err_out;
 736         }
 737
 738         err = __tipc_nl_add_bearer(&msg, bearer, 0);
 739         if (err)
 740                 goto err_out;
 741         rtnl_unlock();
 742
 743         return genlmsg_reply(rep, info);
 744 err_out:
 745         rtnl_unlock();
 746         nlmsg_free(rep);
 747
 748         return err;
 749 }
 750
 751 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 752 {
 753         int err;
 754         char *name;
 755         struct tipc_bearer *bearer;
 756         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 757         struct net *net = sock_net(skb->sk);
 758
 759         if (!info->attrs[TIPC_NLA_BEARER])
 760                 return -EINVAL;
 761
 762         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 763                                info->attrs[TIPC_NLA_BEARER],
 764                                tipc_nl_bearer_policy);
 765         if (err)
 766                 return err;
 767
 768         if (!attrs[TIPC_NLA_BEARER_NAME])
 769                 return -EINVAL;
 770
 771         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 772
 773         rtnl_lock();
 774         bearer = tipc_bearer_find(net, name);
 775         if (!bearer) {
 776                 rtnl_unlock();
 777                 return -EINVAL;
 778         }
 779
 780         bearer_disable(net, bearer);
 781         rtnl_unlock();
 782
 783         return 0;
 784 }
 785
 786 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 787 {
 788         int err;
 789         char *bearer;
 790         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 791         struct net *net = sock_net(skb->sk);
 792         struct tipc_net *tn = net_generic(net, tipc_net_id);
 793         u32 domain;
 794         u32 prio;
 795
 796         prio = TIPC_MEDIA_LINK_PRI;
 797         domain = tn->own_addr & TIPC_CLUSTER_MASK;
 798
 799         if (!info->attrs[TIPC_NLA_BEARER])
 800                 return -EINVAL;
 801
 802         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 803                                info->attrs[TIPC_NLA_BEARER],
 804                                tipc_nl_bearer_policy);
 805         if (err)
 806                 return err;
 807
 808         if (!attrs[TIPC_NLA_BEARER_NAME])
 809                 return -EINVAL;
 810
 811         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 812
 813         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 814                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 815
 816         if (attrs[TIPC_NLA_BEARER_PROP]) {
 817                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 818
 819                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 820                                               props);
 821                 if (err)
 822                         return err;
 823
 824                 if (props[TIPC_NLA_PROP_PRIO])
 825                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 826         }
 827
 828         rtnl_lock();
 829         err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
 830         if (err) {
 831                 rtnl_unlock();
 832                 return err;
 833         }
 834         rtnl_unlock();
 835
 836         return 0;
 837 }
 838
 839 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 840 {
 841         int err;
 842         char *name;
 843         struct tipc_bearer *b;
 844         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 845         struct net *net = sock_net(skb->sk);
 846
 847         if (!info->attrs[TIPC_NLA_BEARER])
 848                 return -EINVAL;
 849
 850         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 851                                info->attrs[TIPC_NLA_BEARER],
 852                                tipc_nl_bearer_policy);
 853         if (err)
 854                 return err;
 855
 856         if (!attrs[TIPC_NLA_BEARER_NAME])
 857                 return -EINVAL;
 858         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 859
 860         rtnl_lock();
 861         b = tipc_bearer_find(net, name);
 862         if (!b) {
 863                 rtnl_unlock();
 864                 return -EINVAL;
 865         }
 866
 867         if (attrs[TIPC_NLA_BEARER_PROP]) {
 868                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 869
 870                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 871                                               props);
 872                 if (err) {
 873                         rtnl_unlock();
 874                         return err;
 875                 }
 876
 877                 if (props[TIPC_NLA_PROP_TOL])
 878                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
 879                 if (props[TIPC_NLA_PROP_PRIO])
 880                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 881                 if (props[TIPC_NLA_PROP_WIN])
 882                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
 883         }
 884         rtnl_unlock();
 885
 886         return 0;
 887 }
 888
 889 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
 890                                struct tipc_media *media, int nlflags)
 891 {
 892         void *hdr;
 893         struct nlattr *attrs;
 894         struct nlattr *prop;
 895
 896         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 897                           nlflags, TIPC_NL_MEDIA_GET);
 898         if (!hdr)
 899                 return -EMSGSIZE;
 900
 901         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
 902         if (!attrs)
 903                 goto msg_full;
 904
 905         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
 906                 goto attr_msg_full;
 907
 908         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
 909         if (!prop)
 910                 goto prop_msg_full;
 911         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
 912                 goto prop_msg_full;
 913         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
 914                 goto prop_msg_full;
 915         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
 916                 goto prop_msg_full;
 917
 918         nla_nest_end(msg->skb, prop);
 919         nla_nest_end(msg->skb, attrs);
 920         genlmsg_end(msg->skb, hdr);
 921
 922         return 0;
 923
 924 prop_msg_full:
 925         nla_nest_cancel(msg->skb, prop);
 926 attr_msg_full:
 927         nla_nest_cancel(msg->skb, attrs);
 928 msg_full:
 929         genlmsg_cancel(msg->skb, hdr);
 930
 931         return -EMSGSIZE;
 932 }
 933
 934 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
 935 {
 936         int err;
 937         int i = cb->args[0];
 938         struct tipc_nl_msg msg;
 939
 940         if (i == MAX_MEDIA)
 941                 return 0;
 942
 943         msg.skb = skb;
 944         msg.portid = NETLINK_CB(cb->skb).portid;
 945         msg.seq = cb->nlh->nlmsg_seq;
 946
 947         rtnl_lock();
 948         for (; media_info_array[i] != NULL; i++) {
 949                 err = __tipc_nl_add_media(&msg, media_info_array[i],
 950                                           NLM_F_MULTI);
 951                 if (err)
 952                         break;
 953         }
 954         rtnl_unlock();
 955
 956         cb->args[0] = i;
 957         return skb->len;
 958 }
 959
 960 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 961 {
 962         int err;
 963         char *name;
 964         struct tipc_nl_msg msg;
 965         struct tipc_media *media;
 966         struct sk_buff *rep;
 967         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 968
 969         if (!info->attrs[TIPC_NLA_MEDIA])
 970                 return -EINVAL;
 971
 972         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
 973                                info->attrs[TIPC_NLA_MEDIA],
 974                                tipc_nl_media_policy);
 975         if (err)
 976                 return err;
 977
 978         if (!attrs[TIPC_NLA_MEDIA_NAME])
 979                 return -EINVAL;
 980         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
 981
 982         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 983         if (!rep)
 984                 return -ENOMEM;
 985
 986         msg.skb = rep;
 987         msg.portid = info->snd_portid;
 988         msg.seq = info->snd_seq;
 989
 990         rtnl_lock();
 991         media = tipc_media_find(name);
 992         if (!media) {
 993                 err = -EINVAL;
 994                 goto err_out;
 995         }
 996
 997         err = __tipc_nl_add_media(&msg, media, 0);
 998         if (err)
 999                 goto err_out;
1000         rtnl_unlock();
1001
1002         return genlmsg_reply(rep, info);
1003 err_out:
1004         rtnl_unlock();
1005         nlmsg_free(rep);
1006
1007         return err;
1008 }
1009
1010 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1011 {
1012         int err;
1013         char *name;
1014         struct tipc_media *m;
1015         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1016
1017         if (!info->attrs[TIPC_NLA_MEDIA])
1018                 return -EINVAL;
1019
1020         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1021                                info->attrs[TIPC_NLA_MEDIA],
1022                                tipc_nl_media_policy);
1023
1024         if (!attrs[TIPC_NLA_MEDIA_NAME])
1025                 return -EINVAL;
1026         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1027
1028         rtnl_lock();
1029         m = tipc_media_find(name);
1030         if (!m) {
1031                 rtnl_unlock();
1032                 return -EINVAL;
1033         }
1034
1035         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1036                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1037
1038                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1039                                               props);
1040                 if (err) {
1041                         rtnl_unlock();
1042                         return err;
1043                 }
1044
1045                 if (props[TIPC_NLA_PROP_TOL])
1046                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1047                 if (props[TIPC_NLA_PROP_PRIO])
1048                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1049                 if (props[TIPC_NLA_PROP_WIN])
1050                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1051         }
1052         rtnl_unlock();
1053
1054         return 0;
1055 }