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         NULL
  52 };
  53
  54 static const struct nla_policy
  55 tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1]  = {
  56         [TIPC_NLA_BEARER_UNSPEC]                = { .type = NLA_UNSPEC },
  57         [TIPC_NLA_BEARER_NAME] = {
  58                 .type = NLA_STRING,
  59                 .len = TIPC_MAX_BEARER_NAME
  60         },
  61         [TIPC_NLA_BEARER_PROP]                  = { .type = NLA_NESTED },
  62         [TIPC_NLA_BEARER_DOMAIN]                = { .type = NLA_U32 }
  63 };
  64
  65 static const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
  66         [TIPC_NLA_MEDIA_UNSPEC]         = { .type = NLA_UNSPEC },
  67         [TIPC_NLA_MEDIA_NAME]           = { .type = NLA_STRING },
  68         [TIPC_NLA_MEDIA_PROP]           = { .type = NLA_NESTED }
  69 };
  70
  71 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
  72                            bool shutting_down);
  73
  74 /**
  75  * tipc_media_find - locates specified media object by name
  76  */
  77 struct tipc_media *tipc_media_find(const char *name)
  78 {
  79         u32 i;
  80
  81         for (i = 0; media_info_array[i] != NULL; i++) {
  82                 if (!strcmp(media_info_array[i]->name, name))
  83                         break;
  84         }
  85         return media_info_array[i];
  86 }
  87
  88 /**
  89  * media_find_id - locates specified media object by type identifier
  90  */
  91 static struct tipc_media *media_find_id(u8 type)
  92 {
  93         u32 i;
  94
  95         for (i = 0; media_info_array[i] != NULL; i++) {
  96                 if (media_info_array[i]->type_id == type)
  97                         break;
  98         }
  99         return media_info_array[i];
 100 }
 101
 102 /**
 103  * tipc_media_addr_printf - record media address in print buffer
 104  */
 105 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
 106 {
 107         char addr_str[MAX_ADDR_STR];
 108         struct tipc_media *m_ptr;
 109         int ret;
 110
 111         m_ptr = media_find_id(a->media_id);
 112
 113         if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
 114                 ret = scnprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
 115         else {
 116                 u32 i;
 117
 118                 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
 119                 for (i = 0; i < sizeof(a->value); i++)
 120                         ret += scnprintf(buf - ret, len + ret,
 121                                             "-%02x", a->value[i]);
 122         }
 123 }
 124
 125 /**
 126  * bearer_name_validate - validate & (optionally) deconstruct bearer name
 127  * @name: ptr to bearer name string
 128  * @name_parts: ptr to area for bearer name components (or NULL if not needed)
 129  *
 130  * Returns 1 if bearer name is valid, otherwise 0.
 131  */
 132 static int bearer_name_validate(const char *name,
 133                                 struct tipc_bearer_names *name_parts)
 134 {
 135         char name_copy[TIPC_MAX_BEARER_NAME];
 136         char *media_name;
 137         char *if_name;
 138         u32 media_len;
 139         u32 if_len;
 140
 141         /* copy bearer name & ensure length is OK */
 142         name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 143         /* need above in case non-Posix strncpy() doesn't pad with nulls */
 144         strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 145         if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 146                 return 0;
 147
 148         /* ensure all component parts of bearer name are present */
 149         media_name = name_copy;
 150         if_name = strchr(media_name, ':');
 151         if (if_name == NULL)
 152                 return 0;
 153         *(if_name++) = 0;
 154         media_len = if_name - media_name;
 155         if_len = strlen(if_name) + 1;
 156
 157         /* validate component parts of bearer name */
 158         if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 159             (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
 160                 return 0;
 161
 162         /* return bearer name components, if necessary */
 163         if (name_parts) {
 164                 strcpy(name_parts->media_name, media_name);
 165                 strcpy(name_parts->if_name, if_name);
 166         }
 167         return 1;
 168 }
 169
 170 /**
 171  * tipc_bearer_find - locates bearer object with matching bearer name
 172  */
 173 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
 174 {
 175         struct tipc_net *tn = net_generic(net, tipc_net_id);
 176         struct tipc_bearer *b_ptr;
 177         u32 i;
 178
 179         for (i = 0; i < MAX_BEARERS; i++) {
 180                 b_ptr = rtnl_dereference(tn->bearer_list[i]);
 181                 if (b_ptr && (!strcmp(b_ptr->name, name)))
 182                         return b_ptr;
 183         }
 184         return NULL;
 185 }
 186
 187 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
 188 {
 189         struct tipc_net *tn = net_generic(net, tipc_net_id);
 190         struct tipc_bearer *b_ptr;
 191
 192         rcu_read_lock();
 193         b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 194         if (b_ptr) {
 195                 tipc_bcbearer_sort(net, &b_ptr->nodes, dest, true);
 196                 tipc_disc_add_dest(b_ptr->link_req);
 197         }
 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_bcbearer_sort(net, &b_ptr->nodes, dest, false);
 210                 tipc_disc_remove_dest(b_ptr->link_req);
 211         }
 212         rcu_read_unlock();
 213 }
 214
 215 /**
 216  * tipc_enable_bearer - enable bearer with the given name
 217  */
 218 static int tipc_enable_bearer(struct net *net, const char *name,
 219                               u32 disc_domain, u32 priority)
 220 {
 221         struct tipc_net *tn = net_generic(net, tipc_net_id);
 222         struct tipc_bearer *b_ptr;
 223         struct tipc_media *m_ptr;
 224         struct tipc_bearer_names b_names;
 225         char addr_string[16];
 226         u32 bearer_id;
 227         u32 with_this_prio;
 228         u32 i;
 229         int res = -EINVAL;
 230
 231         if (!tn->own_addr) {
 232                 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
 233                         name);
 234                 return -ENOPROTOOPT;
 235         }
 236         if (!bearer_name_validate(name, &b_names)) {
 237                 pr_warn("Bearer <%s> rejected, illegal name\n", name);
 238                 return -EINVAL;
 239         }
 240         if (tipc_addr_domain_valid(disc_domain) &&
 241             (disc_domain != tn->own_addr)) {
 242                 if (tipc_in_scope(disc_domain, tn->own_addr)) {
 243                         disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
 244                         res = 0;   /* accept any node in own cluster */
 245                 } else if (in_own_cluster_exact(net, disc_domain))
 246                         res = 0;   /* accept specified node in own cluster */
 247         }
 248         if (res) {
 249                 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
 250                         name);
 251                 return -EINVAL;
 252         }
 253         if ((priority > TIPC_MAX_LINK_PRI) &&
 254             (priority != TIPC_MEDIA_LINK_PRI)) {
 255                 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
 256                 return -EINVAL;
 257         }
 258
 259         m_ptr = tipc_media_find(b_names.media_name);
 260         if (!m_ptr) {
 261                 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
 262                         name, b_names.media_name);
 263                 return -EINVAL;
 264         }
 265
 266         if (priority == TIPC_MEDIA_LINK_PRI)
 267                 priority = m_ptr->priority;
 268
 269 restart:
 270         bearer_id = MAX_BEARERS;
 271         with_this_prio = 1;
 272         for (i = MAX_BEARERS; i-- != 0; ) {
 273                 b_ptr = rtnl_dereference(tn->bearer_list[i]);
 274                 if (!b_ptr) {
 275                         bearer_id = i;
 276                         continue;
 277                 }
 278                 if (!strcmp(name, b_ptr->name)) {
 279                         pr_warn("Bearer <%s> rejected, already enabled\n",
 280                                 name);
 281                         return -EINVAL;
 282                 }
 283                 if ((b_ptr->priority == priority) &&
 284                     (++with_this_prio > 2)) {
 285                         if (priority-- == 0) {
 286                                 pr_warn("Bearer <%s> rejected, duplicate priority\n",
 287                                         name);
 288                                 return -EINVAL;
 289                         }
 290                         pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
 291                                 name, priority + 1, priority);
 292                         goto restart;
 293                 }
 294         }
 295         if (bearer_id >= MAX_BEARERS) {
 296                 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
 297                         name, MAX_BEARERS);
 298                 return -EINVAL;
 299         }
 300
 301         b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
 302         if (!b_ptr)
 303                 return -ENOMEM;
 304
 305         strcpy(b_ptr->name, name);
 306         b_ptr->media = m_ptr;
 307         res = m_ptr->enable_media(net, b_ptr);
 308         if (res) {
 309                 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
 310                         name, -res);
 311                 return -EINVAL;
 312         }
 313
 314         b_ptr->identity = bearer_id;
 315         b_ptr->tolerance = m_ptr->tolerance;
 316         b_ptr->window = m_ptr->window;
 317         b_ptr->domain = disc_domain;
 318         b_ptr->net_plane = bearer_id + 'A';
 319         b_ptr->priority = priority;
 320
 321         res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr);
 322         if (res) {
 323                 bearer_disable(net, b_ptr, false);
 324                 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
 325                         name);
 326                 return -EINVAL;
 327         }
 328
 329         rcu_assign_pointer(tn->bearer_list[bearer_id], b_ptr);
 330
 331         pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
 332                 name,
 333                 tipc_addr_string_fill(addr_string, disc_domain), priority);
 334         return res;
 335 }
 336
 337 /**
 338  * tipc_reset_bearer - Reset all links established over this bearer
 339  */
 340 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr)
 341 {
 342         pr_info("Resetting bearer <%s>\n", b_ptr->name);
 343         tipc_link_reset_list(net, b_ptr->identity);
 344         tipc_disc_reset(net, b_ptr);
 345         return 0;
 346 }
 347
 348 /**
 349  * bearer_disable
 350  *
 351  * Note: This routine assumes caller holds RTNL lock.
 352  */
 353 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
 354                            bool shutting_down)
 355 {
 356         struct tipc_net *tn = net_generic(net, tipc_net_id);
 357         u32 i;
 358
 359         pr_info("Disabling bearer <%s>\n", b_ptr->name);
 360         b_ptr->media->disable_media(b_ptr);
 361
 362         tipc_link_delete_list(net, b_ptr->identity, shutting_down);
 363         if (b_ptr->link_req)
 364                 tipc_disc_delete(b_ptr->link_req);
 365
 366         for (i = 0; i < MAX_BEARERS; i++) {
 367                 if (b_ptr == rtnl_dereference(tn->bearer_list[i])) {
 368                         RCU_INIT_POINTER(tn->bearer_list[i], NULL);
 369                         break;
 370                 }
 371         }
 372         kfree_rcu(b_ptr, rcu);
 373 }
 374
 375 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b)
 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
 385         /* Associate TIPC bearer with L2 bearer */
 386         rcu_assign_pointer(b->media_ptr, dev);
 387         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 388         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 389         b->bcast_addr.media_id = b->media->type_id;
 390         b->bcast_addr.broadcast = 1;
 391         b->mtu = dev->mtu;
 392         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 393         rcu_assign_pointer(dev->tipc_ptr, b);
 394         return 0;
 395 }
 396
 397 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 398  *
 399  * Mark L2 bearer as inactive so that incoming buffers are thrown away,
 400  * then get worker thread to complete bearer cleanup.  (Can't do cleanup
 401  * here because cleanup code needs to sleep and caller holds spinlocks.)
 402  */
 403 void tipc_disable_l2_media(struct tipc_bearer *b)
 404 {
 405         struct net_device *dev;
 406
 407         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 408         RCU_INIT_POINTER(b->media_ptr, NULL);
 409         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 410         synchronize_net();
 411         dev_put(dev);
 412 }
 413
 414 /**
 415  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 416  * @buf: the packet to be sent
 417  * @b_ptr: the bearer through which the packet is to be sent
 418  * @dest: peer destination address
 419  */
 420 int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
 421                      struct tipc_bearer *b, struct tipc_media_addr *dest)
 422 {
 423         struct sk_buff *clone;
 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         clone = skb_clone(buf, GFP_ATOMIC);
 432         if (!clone)
 433                 return 0;
 434
 435         delta = dev->hard_header_len - skb_headroom(buf);
 436         if ((delta > 0) &&
 437             pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
 438                 kfree_skb(clone);
 439                 return 0;
 440         }
 441
 442         skb_reset_network_header(clone);
 443         clone->dev = dev;
 444         clone->protocol = htons(ETH_P_TIPC);
 445         dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
 446                         dev->dev_addr, clone->len);
 447         dev_queue_xmit(clone);
 448         return 0;
 449 }
 450
 451 /* tipc_bearer_send- sends buffer to destination over bearer
 452  *
 453  * IMPORTANT:
 454  * The media send routine must not alter the buffer being passed in
 455  * as it may be needed for later retransmission!
 456  */
 457 void tipc_bearer_send(struct net *net, u32 bearer_id, struct sk_buff *buf,
 458                       struct tipc_media_addr *dest)
 459 {
 460         struct tipc_net *tn = net_generic(net, tipc_net_id);
 461         struct tipc_bearer *b_ptr;
 462
 463         rcu_read_lock();
 464         b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 465         if (likely(b_ptr))
 466                 b_ptr->media->send_msg(net, buf, b_ptr, dest);
 467         rcu_read_unlock();
 468 }
 469
 470 /**
 471  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 472  * @buf: the received packet
 473  * @dev: the net device that the packet was received on
 474  * @pt: the packet_type structure which was used to register this handler
 475  * @orig_dev: the original receive net device in case the device is a bond
 476  *
 477  * Accept only packets explicitly sent to this node, or broadcast packets;
 478  * ignores packets sent using interface multicast, and traffic sent to other
 479  * nodes (which can happen if interface is running in promiscuous mode).
 480  */
 481 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
 482                            struct packet_type *pt, struct net_device *orig_dev)
 483 {
 484         struct tipc_bearer *b_ptr;
 485
 486         rcu_read_lock();
 487         b_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
 488         if (likely(b_ptr)) {
 489                 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
 490                         buf->next = NULL;
 491                         tipc_rcv(dev_net(dev), buf, b_ptr);
 492                         rcu_read_unlock();
 493                         return NET_RX_SUCCESS;
 494                 }
 495         }
 496         rcu_read_unlock();
 497
 498         kfree_skb(buf);
 499         return NET_RX_DROP;
 500 }
 501
 502 /**
 503  * tipc_l2_device_event - handle device events from network device
 504  * @nb: the context of the notification
 505  * @evt: the type of event
 506  * @ptr: the net device that the event was on
 507  *
 508  * This function is called by the Ethernet driver in case of link
 509  * change event.
 510  */
 511 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 512                                 void *ptr)
 513 {
 514         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 515         struct net *net = dev_net(dev);
 516         struct tipc_bearer *b_ptr;
 517
 518         b_ptr = rtnl_dereference(dev->tipc_ptr);
 519         if (!b_ptr)
 520                 return NOTIFY_DONE;
 521
 522         b_ptr->mtu = dev->mtu;
 523
 524         switch (evt) {
 525         case NETDEV_CHANGE:
 526                 if (netif_carrier_ok(dev))
 527                         break;
 528         case NETDEV_DOWN:
 529         case NETDEV_CHANGEMTU:
 530                 tipc_reset_bearer(net, b_ptr);
 531                 break;
 532         case NETDEV_CHANGEADDR:
 533                 b_ptr->media->raw2addr(b_ptr, &b_ptr->addr,
 534                                        (char *)dev->dev_addr);
 535                 tipc_reset_bearer(net, b_ptr);
 536                 break;
 537         case NETDEV_UNREGISTER:
 538         case NETDEV_CHANGENAME:
 539                 bearer_disable(dev_net(dev), b_ptr, false);
 540                 break;
 541         }
 542         return NOTIFY_OK;
 543 }
 544
 545 static struct packet_type tipc_packet_type __read_mostly = {
 546         .type = htons(ETH_P_TIPC),
 547         .func = tipc_l2_rcv_msg,
 548 };
 549
 550 static struct notifier_block notifier = {
 551         .notifier_call  = tipc_l2_device_event,
 552         .priority       = 0,
 553 };
 554
 555 int tipc_bearer_setup(void)
 556 {
 557         int err;
 558
 559         err = register_netdevice_notifier(&notifier);
 560         if (err)
 561                 return err;
 562         dev_add_pack(&tipc_packet_type);
 563         return 0;
 564 }
 565
 566 void tipc_bearer_cleanup(void)
 567 {
 568         unregister_netdevice_notifier(&notifier);
 569         dev_remove_pack(&tipc_packet_type);
 570 }
 571
 572 void tipc_bearer_stop(struct net *net)
 573 {
 574         struct tipc_net *tn = net_generic(net, tipc_net_id);
 575         struct tipc_bearer *b_ptr;
 576         u32 i;
 577
 578         for (i = 0; i < MAX_BEARERS; i++) {
 579                 b_ptr = rtnl_dereference(tn->bearer_list[i]);
 580                 if (b_ptr) {
 581                         bearer_disable(net, b_ptr, true);
 582                         tn->bearer_list[i] = NULL;
 583                 }
 584         }
 585 }
 586
 587 /* Caller should hold rtnl_lock to protect the bearer */
 588 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 589                                 struct tipc_bearer *bearer)
 590 {
 591         void *hdr;
 592         struct nlattr *attrs;
 593         struct nlattr *prop;
 594
 595         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 596                           NLM_F_MULTI, TIPC_NL_BEARER_GET);
 597         if (!hdr)
 598                 return -EMSGSIZE;
 599
 600         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
 601         if (!attrs)
 602                 goto msg_full;
 603
 604         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 605                 goto attr_msg_full;
 606
 607         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
 608         if (!prop)
 609                 goto prop_msg_full;
 610         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 611                 goto prop_msg_full;
 612         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 613                 goto prop_msg_full;
 614         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 615                 goto prop_msg_full;
 616
 617         nla_nest_end(msg->skb, prop);
 618         nla_nest_end(msg->skb, attrs);
 619         genlmsg_end(msg->skb, hdr);
 620
 621         return 0;
 622
 623 prop_msg_full:
 624         nla_nest_cancel(msg->skb, prop);
 625 attr_msg_full:
 626         nla_nest_cancel(msg->skb, attrs);
 627 msg_full:
 628         genlmsg_cancel(msg->skb, hdr);
 629
 630         return -EMSGSIZE;
 631 }
 632
 633 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 634 {
 635         int err;
 636         int i = cb->args[0];
 637         struct tipc_bearer *bearer;
 638         struct tipc_nl_msg msg;
 639         struct net *net = sock_net(skb->sk);
 640         struct tipc_net *tn = net_generic(net, tipc_net_id);
 641
 642         if (i == MAX_BEARERS)
 643                 return 0;
 644
 645         msg.skb = skb;
 646         msg.portid = NETLINK_CB(cb->skb).portid;
 647         msg.seq = cb->nlh->nlmsg_seq;
 648
 649         rtnl_lock();
 650         for (i = 0; i < MAX_BEARERS; i++) {
 651                 bearer = rtnl_dereference(tn->bearer_list[i]);
 652                 if (!bearer)
 653                         continue;
 654
 655                 err = __tipc_nl_add_bearer(&msg, bearer);
 656                 if (err)
 657                         break;
 658         }
 659         rtnl_unlock();
 660
 661         cb->args[0] = i;
 662         return skb->len;
 663 }
 664
 665 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 666 {
 667         int err;
 668         char *name;
 669         struct sk_buff *rep;
 670         struct tipc_bearer *bearer;
 671         struct tipc_nl_msg msg;
 672         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 673         struct net *net = genl_info_net(info);
 674
 675         if (!info->attrs[TIPC_NLA_BEARER])
 676                 return -EINVAL;
 677
 678         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 679                                info->attrs[TIPC_NLA_BEARER],
 680                                tipc_nl_bearer_policy);
 681         if (err)
 682                 return err;
 683
 684         if (!attrs[TIPC_NLA_BEARER_NAME])
 685                 return -EINVAL;
 686         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 687
 688         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 689         if (!rep)
 690                 return -ENOMEM;
 691
 692         msg.skb = rep;
 693         msg.portid = info->snd_portid;
 694         msg.seq = info->snd_seq;
 695
 696         rtnl_lock();
 697         bearer = tipc_bearer_find(net, name);
 698         if (!bearer) {
 699                 err = -EINVAL;
 700                 goto err_out;
 701         }
 702
 703         err = __tipc_nl_add_bearer(&msg, bearer);
 704         if (err)
 705                 goto err_out;
 706         rtnl_unlock();
 707
 708         return genlmsg_reply(rep, info);
 709 err_out:
 710         rtnl_unlock();
 711         nlmsg_free(rep);
 712
 713         return err;
 714 }
 715
 716 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 717 {
 718         int err;
 719         char *name;
 720         struct tipc_bearer *bearer;
 721         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 722         struct net *net = sock_net(skb->sk);
 723
 724         if (!info->attrs[TIPC_NLA_BEARER])
 725                 return -EINVAL;
 726
 727         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 728                                info->attrs[TIPC_NLA_BEARER],
 729                                tipc_nl_bearer_policy);
 730         if (err)
 731                 return err;
 732
 733         if (!attrs[TIPC_NLA_BEARER_NAME])
 734                 return -EINVAL;
 735
 736         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 737
 738         rtnl_lock();
 739         bearer = tipc_bearer_find(net, name);
 740         if (!bearer) {
 741                 rtnl_unlock();
 742                 return -EINVAL;
 743         }
 744
 745         bearer_disable(net, bearer, false);
 746         rtnl_unlock();
 747
 748         return 0;
 749 }
 750
 751 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 752 {
 753         int err;
 754         char *bearer;
 755         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 756         struct net *net = sock_net(skb->sk);
 757         struct tipc_net *tn = net_generic(net, tipc_net_id);
 758         u32 domain;
 759         u32 prio;
 760
 761         prio = TIPC_MEDIA_LINK_PRI;
 762         domain = tn->own_addr & TIPC_CLUSTER_MASK;
 763
 764         if (!info->attrs[TIPC_NLA_BEARER])
 765                 return -EINVAL;
 766
 767         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 768                                info->attrs[TIPC_NLA_BEARER],
 769                                tipc_nl_bearer_policy);
 770         if (err)
 771                 return err;
 772
 773         if (!attrs[TIPC_NLA_BEARER_NAME])
 774                 return -EINVAL;
 775
 776         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 777
 778         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 779                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 780
 781         if (attrs[TIPC_NLA_BEARER_PROP]) {
 782                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 783
 784                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 785                                               props);
 786                 if (err)
 787                         return err;
 788
 789                 if (props[TIPC_NLA_PROP_PRIO])
 790                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 791         }
 792
 793         rtnl_lock();
 794         err = tipc_enable_bearer(net, bearer, domain, prio);
 795         if (err) {
 796                 rtnl_unlock();
 797                 return err;
 798         }
 799         rtnl_unlock();
 800
 801         return 0;
 802 }
 803
 804 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 805 {
 806         int err;
 807         char *name;
 808         struct tipc_bearer *b;
 809         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 810         struct net *net = genl_info_net(info);
 811
 812         if (!info->attrs[TIPC_NLA_BEARER])
 813                 return -EINVAL;
 814
 815         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 816                                info->attrs[TIPC_NLA_BEARER],
 817                                tipc_nl_bearer_policy);
 818         if (err)
 819                 return err;
 820
 821         if (!attrs[TIPC_NLA_BEARER_NAME])
 822                 return -EINVAL;
 823         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 824
 825         rtnl_lock();
 826         b = tipc_bearer_find(net, name);
 827         if (!b) {
 828                 rtnl_unlock();
 829                 return -EINVAL;
 830         }
 831
 832         if (attrs[TIPC_NLA_BEARER_PROP]) {
 833                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 834
 835                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 836                                               props);
 837                 if (err) {
 838                         rtnl_unlock();
 839                         return err;
 840                 }
 841
 842                 if (props[TIPC_NLA_PROP_TOL])
 843                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
 844                 if (props[TIPC_NLA_PROP_PRIO])
 845                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 846                 if (props[TIPC_NLA_PROP_WIN])
 847                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
 848         }
 849         rtnl_unlock();
 850
 851         return 0;
 852 }
 853
 854 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
 855                                struct tipc_media *media)
 856 {
 857         void *hdr;
 858         struct nlattr *attrs;
 859         struct nlattr *prop;
 860
 861         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 862                           NLM_F_MULTI, TIPC_NL_MEDIA_GET);
 863         if (!hdr)
 864                 return -EMSGSIZE;
 865
 866         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
 867         if (!attrs)
 868                 goto msg_full;
 869
 870         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
 871                 goto attr_msg_full;
 872
 873         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
 874         if (!prop)
 875                 goto prop_msg_full;
 876         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
 877                 goto prop_msg_full;
 878         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
 879                 goto prop_msg_full;
 880         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
 881                 goto prop_msg_full;
 882
 883         nla_nest_end(msg->skb, prop);
 884         nla_nest_end(msg->skb, attrs);
 885         genlmsg_end(msg->skb, hdr);
 886
 887         return 0;
 888
 889 prop_msg_full:
 890         nla_nest_cancel(msg->skb, prop);
 891 attr_msg_full:
 892         nla_nest_cancel(msg->skb, attrs);
 893 msg_full:
 894         genlmsg_cancel(msg->skb, hdr);
 895
 896         return -EMSGSIZE;
 897 }
 898
 899 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
 900 {
 901         int err;
 902         int i = cb->args[0];
 903         struct tipc_nl_msg msg;
 904
 905         if (i == MAX_MEDIA)
 906                 return 0;
 907
 908         msg.skb = skb;
 909         msg.portid = NETLINK_CB(cb->skb).portid;
 910         msg.seq = cb->nlh->nlmsg_seq;
 911
 912         rtnl_lock();
 913         for (; media_info_array[i] != NULL; i++) {
 914                 err = __tipc_nl_add_media(&msg, media_info_array[i]);
 915                 if (err)
 916                         break;
 917         }
 918         rtnl_unlock();
 919
 920         cb->args[0] = i;
 921         return skb->len;
 922 }
 923
 924 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 925 {
 926         int err;
 927         char *name;
 928         struct tipc_nl_msg msg;
 929         struct tipc_media *media;
 930         struct sk_buff *rep;
 931         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 932
 933         if (!info->attrs[TIPC_NLA_MEDIA])
 934                 return -EINVAL;
 935
 936         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
 937                                info->attrs[TIPC_NLA_MEDIA],
 938                                tipc_nl_media_policy);
 939         if (err)
 940                 return err;
 941
 942         if (!attrs[TIPC_NLA_MEDIA_NAME])
 943                 return -EINVAL;
 944         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
 945
 946         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 947         if (!rep)
 948                 return -ENOMEM;
 949
 950         msg.skb = rep;
 951         msg.portid = info->snd_portid;
 952         msg.seq = info->snd_seq;
 953
 954         rtnl_lock();
 955         media = tipc_media_find(name);
 956         if (!media) {
 957                 err = -EINVAL;
 958                 goto err_out;
 959         }
 960
 961         err = __tipc_nl_add_media(&msg, media);
 962         if (err)
 963                 goto err_out;
 964         rtnl_unlock();
 965
 966         return genlmsg_reply(rep, info);
 967 err_out:
 968         rtnl_unlock();
 969         nlmsg_free(rep);
 970
 971         return err;
 972 }
 973
 974 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
 975 {
 976         int err;
 977         char *name;
 978         struct tipc_media *m;
 979         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 980
 981         if (!info->attrs[TIPC_NLA_MEDIA])
 982                 return -EINVAL;
 983
 984         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
 985                                info->attrs[TIPC_NLA_MEDIA],
 986                                tipc_nl_media_policy);
 987
 988         if (!attrs[TIPC_NLA_MEDIA_NAME])
 989                 return -EINVAL;
 990         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
 991
 992         rtnl_lock();
 993         m = tipc_media_find(name);
 994         if (!m) {
 995                 rtnl_unlock();
 996                 return -EINVAL;
 997         }
 998
 999         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1000                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1001
1002                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1003                                               props);
1004                 if (err) {
1005                         rtnl_unlock();
1006                         return err;
1007                 }
1008
1009                 if (props[TIPC_NLA_PROP_TOL])
1010                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1011                 if (props[TIPC_NLA_PROP_PRIO])
1012                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1013                 if (props[TIPC_NLA_PROP_WIN])
1014                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1015         }
1016         rtnl_unlock();
1017
1018         return 0;
1019 }