1 /* 2 * net/tipc/bearer.c: TIPC bearer code 3 * 4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB 5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the names of the copyright holders nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * Alternatively, this software may be distributed under the terms of the 21 * GNU General Public License ("GPL") version 2 as published by the Free 22 * Software Foundation. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include <net/sock.h> 38 #include "core.h" 39 #include "bearer.h" 40 #include "link.h" 41 #include "discover.h" 42 #include "monitor.h" 43 #include "bcast.h" 44 #include "netlink.h" 45 #include "udp_media.h" 46 #include "trace.h" 47 #include "crypto.h" 48 49 #define MAX_ADDR_STR 60 50 51 static struct tipc_media * const media_info_array[] = { 52 ð_media_info, 53 #ifdef CONFIG_TIPC_MEDIA_IB 54 &ib_media_info, 55 #endif 56 #ifdef CONFIG_TIPC_MEDIA_UDP 57 &udp_media_info, 58 #endif 59 NULL 60 }; 61 62 static struct tipc_bearer *bearer_get(struct net *net, int bearer_id) 63 { 64 struct tipc_net *tn = tipc_net(net); 65 66 return rcu_dereference(tn->bearer_list[bearer_id]); 67 } 68 69 static void bearer_disable(struct net *net, struct tipc_bearer *b); 70 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, 71 struct packet_type *pt, struct net_device *orig_dev); 72 73 /** 74 * tipc_media_find - locates specified media object by name 75 * @name: name to locate 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 * @type: type identifier to locate 91 */ 92 static struct tipc_media *media_find_id(u8 type) 93 { 94 u32 i; 95 96 for (i = 0; media_info_array[i] != NULL; i++) { 97 if (media_info_array[i]->type_id == type) 98 break; 99 } 100 return media_info_array[i]; 101 } 102 103 /** 104 * tipc_media_addr_printf - record media address in print buffer 105 * @buf: output buffer 106 * @len: output buffer size remaining 107 * @a: input media address 108 */ 109 int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) 110 { 111 char addr_str[MAX_ADDR_STR]; 112 struct tipc_media *m; 113 int ret; 114 115 m = media_find_id(a->media_id); 116 117 if (m && !m->addr2str(a, addr_str, sizeof(addr_str))) 118 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str); 119 else { 120 u32 i; 121 122 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); 123 for (i = 0; i < sizeof(a->value); i++) 124 ret += scnprintf(buf + ret, len - ret, 125 "-%x", a->value[i]); 126 } 127 return ret; 128 } 129 130 /** 131 * bearer_name_validate - validate & (optionally) deconstruct bearer name 132 * @name: ptr to bearer name string 133 * @name_parts: ptr to area for bearer name components (or NULL if not needed) 134 * 135 * Return: 1 if bearer name is valid, otherwise 0. 136 */ 137 static int bearer_name_validate(const char *name, 138 struct tipc_bearer_names *name_parts) 139 { 140 char name_copy[TIPC_MAX_BEARER_NAME]; 141 char *media_name; 142 char *if_name; 143 u32 media_len; 144 u32 if_len; 145 146 /* copy bearer name & ensure length is OK */ 147 if (strscpy(name_copy, name, TIPC_MAX_BEARER_NAME) < 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 * @net: the applicable net namespace 175 * @name: bearer name to locate 176 */ 177 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) 178 { 179 struct tipc_net *tn = net_generic(net, tipc_net_id); 180 struct tipc_bearer *b; 181 u32 i; 182 183 for (i = 0; i < MAX_BEARERS; i++) { 184 b = rtnl_dereference(tn->bearer_list[i]); 185 if (b && (!strcmp(b->name, name))) 186 return b; 187 } 188 return NULL; 189 } 190 191 /* tipc_bearer_get_name - get the bearer name from its id. 192 * @net: network namespace 193 * @name: a pointer to the buffer where the name will be stored. 194 * @bearer_id: the id to get the name from. 195 */ 196 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id) 197 { 198 struct tipc_net *tn = tipc_net(net); 199 struct tipc_bearer *b; 200 201 if (bearer_id >= MAX_BEARERS) 202 return -EINVAL; 203 204 b = rtnl_dereference(tn->bearer_list[bearer_id]); 205 if (!b) 206 return -EINVAL; 207 208 strcpy(name, b->name); 209 return 0; 210 } 211 212 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) 213 { 214 struct tipc_net *tn = net_generic(net, tipc_net_id); 215 struct tipc_bearer *b; 216 217 rcu_read_lock(); 218 b = rcu_dereference(tn->bearer_list[bearer_id]); 219 if (b) 220 tipc_disc_add_dest(b->disc); 221 rcu_read_unlock(); 222 } 223 224 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) 225 { 226 struct tipc_net *tn = net_generic(net, tipc_net_id); 227 struct tipc_bearer *b; 228 229 rcu_read_lock(); 230 b = rcu_dereference(tn->bearer_list[bearer_id]); 231 if (b) 232 tipc_disc_remove_dest(b->disc); 233 rcu_read_unlock(); 234 } 235 236 /** 237 * tipc_enable_bearer - enable bearer with the given name 238 * @net: the applicable net namespace 239 * @name: bearer name to enable 240 * @disc_domain: bearer domain 241 * @prio: bearer priority 242 * @attr: nlattr array 243 * @extack: netlink extended ack 244 */ 245 static int tipc_enable_bearer(struct net *net, const char *name, 246 u32 disc_domain, u32 prio, 247 struct nlattr *attr[], 248 struct netlink_ext_ack *extack) 249 { 250 struct tipc_net *tn = tipc_net(net); 251 struct tipc_bearer_names b_names; 252 int with_this_prio = 1; 253 struct tipc_bearer *b; 254 struct tipc_media *m; 255 struct sk_buff *skb; 256 int bearer_id = 0; 257 int res = -EINVAL; 258 char *errstr = ""; 259 u32 i; 260 261 if (!bearer_name_validate(name, &b_names)) { 262 errstr = "illegal name"; 263 NL_SET_ERR_MSG(extack, "Illegal name"); 264 goto rejected; 265 } 266 267 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) { 268 errstr = "illegal priority"; 269 NL_SET_ERR_MSG(extack, "Illegal priority"); 270 goto rejected; 271 } 272 273 m = tipc_media_find(b_names.media_name); 274 if (!m) { 275 errstr = "media not registered"; 276 NL_SET_ERR_MSG(extack, "Media not registered"); 277 goto rejected; 278 } 279 280 if (prio == TIPC_MEDIA_LINK_PRI) 281 prio = m->priority; 282 283 /* Check new bearer vs existing ones and find free bearer id if any */ 284 bearer_id = MAX_BEARERS; 285 i = MAX_BEARERS; 286 while (i-- != 0) { 287 b = rtnl_dereference(tn->bearer_list[i]); 288 if (!b) { 289 bearer_id = i; 290 continue; 291 } 292 if (!strcmp(name, b->name)) { 293 errstr = "already enabled"; 294 NL_SET_ERR_MSG(extack, "Already enabled"); 295 goto rejected; 296 } 297 298 if (b->priority == prio && 299 (++with_this_prio > 2)) { 300 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n", 301 name, prio); 302 303 if (prio == TIPC_MIN_LINK_PRI) { 304 errstr = "cannot adjust to lower"; 305 NL_SET_ERR_MSG(extack, "Cannot adjust to lower"); 306 goto rejected; 307 } 308 309 pr_warn("Bearer <%s>: trying with adjusted priority\n", 310 name); 311 prio--; 312 bearer_id = MAX_BEARERS; 313 i = MAX_BEARERS; 314 with_this_prio = 1; 315 } 316 } 317 318 if (bearer_id >= MAX_BEARERS) { 319 errstr = "max 3 bearers permitted"; 320 NL_SET_ERR_MSG(extack, "Max 3 bearers permitted"); 321 goto rejected; 322 } 323 324 b = kzalloc(sizeof(*b), GFP_ATOMIC); 325 if (!b) 326 return -ENOMEM; 327 328 strcpy(b->name, name); 329 b->media = m; 330 res = m->enable_media(net, b, attr); 331 if (res) { 332 kfree(b); 333 errstr = "failed to enable media"; 334 NL_SET_ERR_MSG(extack, "Failed to enable media"); 335 goto rejected; 336 } 337 338 b->identity = bearer_id; 339 b->tolerance = m->tolerance; 340 b->min_win = m->min_win; 341 b->max_win = m->max_win; 342 b->domain = disc_domain; 343 b->net_plane = bearer_id + 'A'; 344 b->priority = prio; 345 refcount_set(&b->refcnt, 1); 346 347 res = tipc_disc_create(net, b, &b->bcast_addr, &skb); 348 if (res) { 349 bearer_disable(net, b); 350 errstr = "failed to create discoverer"; 351 NL_SET_ERR_MSG(extack, "Failed to create discoverer"); 352 goto rejected; 353 } 354 355 test_and_set_bit_lock(0, &b->up); 356 rcu_assign_pointer(tn->bearer_list[bearer_id], b); 357 if (skb) 358 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); 359 360 if (tipc_mon_create(net, bearer_id)) { 361 bearer_disable(net, b); 362 return -ENOMEM; 363 } 364 365 pr_info("Enabled bearer <%s>, priority %u\n", name, prio); 366 367 return res; 368 rejected: 369 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr); 370 return res; 371 } 372 373 /** 374 * tipc_reset_bearer - Reset all links established over this bearer 375 * @net: the applicable net namespace 376 * @b: the target bearer 377 */ 378 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) 379 { 380 pr_info("Resetting bearer <%s>\n", b->name); 381 tipc_node_delete_links(net, b->identity); 382 tipc_disc_reset(net, b); 383 return 0; 384 } 385 386 bool tipc_bearer_hold(struct tipc_bearer *b) 387 { 388 return (b && refcount_inc_not_zero(&b->refcnt)); 389 } 390 391 void tipc_bearer_put(struct tipc_bearer *b) 392 { 393 if (b && refcount_dec_and_test(&b->refcnt)) 394 kfree_rcu(b, rcu); 395 } 396 397 /** 398 * bearer_disable - disable this bearer 399 * @net: the applicable net namespace 400 * @b: the bearer to disable 401 * 402 * Note: This routine assumes caller holds RTNL lock. 403 */ 404 static void bearer_disable(struct net *net, struct tipc_bearer *b) 405 { 406 struct tipc_net *tn = tipc_net(net); 407 int bearer_id = b->identity; 408 409 pr_info("Disabling bearer <%s>\n", b->name); 410 clear_bit_unlock(0, &b->up); 411 tipc_node_delete_links(net, bearer_id); 412 b->media->disable_media(b); 413 RCU_INIT_POINTER(b->media_ptr, NULL); 414 if (b->disc) 415 tipc_disc_delete(b->disc); 416 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); 417 tipc_bearer_put(b); 418 tipc_mon_delete(net, bearer_id); 419 } 420 421 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 422 struct nlattr *attr[]) 423 { 424 char *dev_name = strchr((const char *)b->name, ':') + 1; 425 int hwaddr_len = b->media->hwaddr_len; 426 u8 node_id[NODE_ID_LEN] = {0,}; 427 struct net_device *dev; 428 429 /* Find device with specified name */ 430 dev = dev_get_by_name(net, dev_name); 431 if (!dev) 432 return -ENODEV; 433 if (tipc_mtu_bad(dev, 0)) { 434 dev_put(dev); 435 return -EINVAL; 436 } 437 if (dev == net->loopback_dev) { 438 dev_put(dev); 439 pr_info("Enabling <%s> not permitted\n", b->name); 440 return -EINVAL; 441 } 442 443 /* Autoconfigure own node identity if needed */ 444 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) { 445 memcpy(node_id, dev->dev_addr, hwaddr_len); 446 tipc_net_init(net, node_id, 0); 447 } 448 if (!tipc_own_id(net)) { 449 dev_put(dev); 450 pr_warn("Failed to obtain node identity\n"); 451 return -EINVAL; 452 } 453 454 /* Associate TIPC bearer with L2 bearer */ 455 rcu_assign_pointer(b->media_ptr, dev); 456 b->pt.dev = dev; 457 b->pt.type = htons(ETH_P_TIPC); 458 b->pt.func = tipc_l2_rcv_msg; 459 dev_add_pack(&b->pt); 460 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 461 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len); 462 b->bcast_addr.media_id = b->media->type_id; 463 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 464 b->mtu = dev->mtu; 465 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 466 rcu_assign_pointer(dev->tipc_ptr, b); 467 return 0; 468 } 469 470 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 471 * @b: the target bearer 472 * 473 * Mark L2 bearer as inactive so that incoming buffers are thrown away 474 */ 475 void tipc_disable_l2_media(struct tipc_bearer *b) 476 { 477 struct net_device *dev; 478 479 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 480 dev_remove_pack(&b->pt); 481 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 482 synchronize_net(); 483 dev_put(dev); 484 } 485 486 /** 487 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 488 * @net: the associated network namespace 489 * @skb: the packet to be sent 490 * @b: the bearer through which the packet is to be sent 491 * @dest: peer destination address 492 */ 493 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, 494 struct tipc_bearer *b, struct tipc_media_addr *dest) 495 { 496 struct net_device *dev; 497 int delta; 498 499 dev = (struct net_device *)rcu_dereference(b->media_ptr); 500 if (!dev) 501 return 0; 502 503 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); 504 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) { 505 kfree_skb(skb); 506 return 0; 507 } 508 skb_reset_network_header(skb); 509 skb->dev = dev; 510 skb->protocol = htons(ETH_P_TIPC); 511 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, 512 dev->dev_addr, skb->len); 513 dev_queue_xmit(skb); 514 return 0; 515 } 516 517 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id) 518 { 519 bool supp = false; 520 struct tipc_bearer *b; 521 522 rcu_read_lock(); 523 b = bearer_get(net, bearer_id); 524 if (b) 525 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT); 526 rcu_read_unlock(); 527 return supp; 528 } 529 530 int tipc_bearer_mtu(struct net *net, u32 bearer_id) 531 { 532 int mtu = 0; 533 struct tipc_bearer *b; 534 535 rcu_read_lock(); 536 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]); 537 if (b) 538 mtu = b->mtu; 539 rcu_read_unlock(); 540 return mtu; 541 } 542 543 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer 544 */ 545 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, 546 struct sk_buff *skb, 547 struct tipc_media_addr *dest) 548 { 549 struct tipc_msg *hdr = buf_msg(skb); 550 struct tipc_bearer *b; 551 552 rcu_read_lock(); 553 b = bearer_get(net, bearer_id); 554 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) { 555 #ifdef CONFIG_TIPC_CRYPTO 556 tipc_crypto_xmit(net, &skb, b, dest, NULL); 557 if (skb) 558 #endif 559 b->media->send_msg(net, skb, b, dest); 560 } else { 561 kfree_skb(skb); 562 } 563 rcu_read_unlock(); 564 } 565 566 /* tipc_bearer_xmit() -send buffer to destination over bearer 567 */ 568 void tipc_bearer_xmit(struct net *net, u32 bearer_id, 569 struct sk_buff_head *xmitq, 570 struct tipc_media_addr *dst, 571 struct tipc_node *__dnode) 572 { 573 struct tipc_bearer *b; 574 struct sk_buff *skb, *tmp; 575 576 if (skb_queue_empty(xmitq)) 577 return; 578 579 rcu_read_lock(); 580 b = bearer_get(net, bearer_id); 581 if (unlikely(!b)) 582 __skb_queue_purge(xmitq); 583 skb_queue_walk_safe(xmitq, skb, tmp) { 584 __skb_dequeue(xmitq); 585 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) { 586 #ifdef CONFIG_TIPC_CRYPTO 587 tipc_crypto_xmit(net, &skb, b, dst, __dnode); 588 if (skb) 589 #endif 590 b->media->send_msg(net, skb, b, dst); 591 } else { 592 kfree_skb(skb); 593 } 594 } 595 rcu_read_unlock(); 596 } 597 598 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations 599 */ 600 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 601 struct sk_buff_head *xmitq) 602 { 603 struct tipc_net *tn = tipc_net(net); 604 struct tipc_media_addr *dst; 605 int net_id = tn->net_id; 606 struct tipc_bearer *b; 607 struct sk_buff *skb, *tmp; 608 struct tipc_msg *hdr; 609 610 rcu_read_lock(); 611 b = bearer_get(net, bearer_id); 612 if (unlikely(!b || !test_bit(0, &b->up))) 613 __skb_queue_purge(xmitq); 614 skb_queue_walk_safe(xmitq, skb, tmp) { 615 hdr = buf_msg(skb); 616 msg_set_non_seq(hdr, 1); 617 msg_set_mc_netid(hdr, net_id); 618 __skb_dequeue(xmitq); 619 dst = &b->bcast_addr; 620 #ifdef CONFIG_TIPC_CRYPTO 621 tipc_crypto_xmit(net, &skb, b, dst, NULL); 622 if (skb) 623 #endif 624 b->media->send_msg(net, skb, b, dst); 625 } 626 rcu_read_unlock(); 627 } 628 629 /** 630 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 631 * @skb: the received message 632 * @dev: the net device that the packet was received on 633 * @pt: the packet_type structure which was used to register this handler 634 * @orig_dev: the original receive net device in case the device is a bond 635 * 636 * Accept only packets explicitly sent to this node, or broadcast packets; 637 * ignores packets sent using interface multicast, and traffic sent to other 638 * nodes (which can happen if interface is running in promiscuous mode). 639 */ 640 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, 641 struct packet_type *pt, struct net_device *orig_dev) 642 { 643 struct tipc_bearer *b; 644 645 rcu_read_lock(); 646 b = rcu_dereference(dev->tipc_ptr) ?: 647 rcu_dereference(orig_dev->tipc_ptr); 648 if (likely(b && test_bit(0, &b->up) && 649 (skb->pkt_type <= PACKET_MULTICAST))) { 650 skb_mark_not_on_list(skb); 651 TIPC_SKB_CB(skb)->flags = 0; 652 tipc_rcv(dev_net(b->pt.dev), skb, b); 653 rcu_read_unlock(); 654 return NET_RX_SUCCESS; 655 } 656 rcu_read_unlock(); 657 kfree_skb(skb); 658 return NET_RX_DROP; 659 } 660 661 /** 662 * tipc_l2_device_event - handle device events from network device 663 * @nb: the context of the notification 664 * @evt: the type of event 665 * @ptr: the net device that the event was on 666 * 667 * This function is called by the Ethernet driver in case of link 668 * change event. 669 */ 670 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 671 void *ptr) 672 { 673 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 674 struct net *net = dev_net(dev); 675 struct tipc_bearer *b; 676 677 b = rtnl_dereference(dev->tipc_ptr); 678 if (!b) 679 return NOTIFY_DONE; 680 681 trace_tipc_l2_device_event(dev, b, evt); 682 switch (evt) { 683 case NETDEV_CHANGE: 684 if (netif_carrier_ok(dev) && netif_oper_up(dev)) { 685 test_and_set_bit_lock(0, &b->up); 686 break; 687 } 688 fallthrough; 689 case NETDEV_GOING_DOWN: 690 clear_bit_unlock(0, &b->up); 691 tipc_reset_bearer(net, b); 692 break; 693 case NETDEV_UP: 694 test_and_set_bit_lock(0, &b->up); 695 break; 696 case NETDEV_CHANGEMTU: 697 if (tipc_mtu_bad(dev, 0)) { 698 bearer_disable(net, b); 699 break; 700 } 701 b->mtu = dev->mtu; 702 tipc_reset_bearer(net, b); 703 break; 704 case NETDEV_CHANGEADDR: 705 b->media->raw2addr(b, &b->addr, 706 (char *)dev->dev_addr); 707 tipc_reset_bearer(net, b); 708 break; 709 case NETDEV_UNREGISTER: 710 case NETDEV_CHANGENAME: 711 bearer_disable(net, b); 712 break; 713 } 714 return NOTIFY_OK; 715 } 716 717 static struct notifier_block notifier = { 718 .notifier_call = tipc_l2_device_event, 719 .priority = 0, 720 }; 721 722 int tipc_bearer_setup(void) 723 { 724 return register_netdevice_notifier(¬ifier); 725 } 726 727 void tipc_bearer_cleanup(void) 728 { 729 unregister_netdevice_notifier(¬ifier); 730 } 731 732 void tipc_bearer_stop(struct net *net) 733 { 734 struct tipc_net *tn = net_generic(net, tipc_net_id); 735 struct tipc_bearer *b; 736 u32 i; 737 738 for (i = 0; i < MAX_BEARERS; i++) { 739 b = rtnl_dereference(tn->bearer_list[i]); 740 if (b) { 741 bearer_disable(net, b); 742 tn->bearer_list[i] = NULL; 743 } 744 } 745 } 746 747 void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts) 748 { 749 struct net_device *dev = net->loopback_dev; 750 struct sk_buff *skb, *_skb; 751 int exp; 752 753 skb_queue_walk(pkts, _skb) { 754 skb = pskb_copy(_skb, GFP_ATOMIC); 755 if (!skb) 756 continue; 757 758 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); 759 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) { 760 kfree_skb(skb); 761 continue; 762 } 763 764 skb_reset_network_header(skb); 765 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr, 766 dev->dev_addr, skb->len); 767 skb->dev = dev; 768 skb->pkt_type = PACKET_HOST; 769 skb->ip_summed = CHECKSUM_UNNECESSARY; 770 skb->protocol = eth_type_trans(skb, dev); 771 netif_rx_ni(skb); 772 } 773 } 774 775 static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev, 776 struct packet_type *pt, struct net_device *od) 777 { 778 consume_skb(skb); 779 return NET_RX_SUCCESS; 780 } 781 782 int tipc_attach_loopback(struct net *net) 783 { 784 struct net_device *dev = net->loopback_dev; 785 struct tipc_net *tn = tipc_net(net); 786 787 if (!dev) 788 return -ENODEV; 789 790 dev_hold(dev); 791 tn->loopback_pt.dev = dev; 792 tn->loopback_pt.type = htons(ETH_P_TIPC); 793 tn->loopback_pt.func = tipc_loopback_rcv_pkt; 794 dev_add_pack(&tn->loopback_pt); 795 return 0; 796 } 797 798 void tipc_detach_loopback(struct net *net) 799 { 800 struct tipc_net *tn = tipc_net(net); 801 802 dev_remove_pack(&tn->loopback_pt); 803 dev_put(net->loopback_dev); 804 } 805 806 /* Caller should hold rtnl_lock to protect the bearer */ 807 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 808 struct tipc_bearer *bearer, int nlflags) 809 { 810 void *hdr; 811 struct nlattr *attrs; 812 struct nlattr *prop; 813 814 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 815 nlflags, TIPC_NL_BEARER_GET); 816 if (!hdr) 817 return -EMSGSIZE; 818 819 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER); 820 if (!attrs) 821 goto msg_full; 822 823 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 824 goto attr_msg_full; 825 826 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP); 827 if (!prop) 828 goto prop_msg_full; 829 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 830 goto prop_msg_full; 831 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 832 goto prop_msg_full; 833 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win)) 834 goto prop_msg_full; 835 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) 836 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu)) 837 goto prop_msg_full; 838 839 nla_nest_end(msg->skb, prop); 840 841 #ifdef CONFIG_TIPC_MEDIA_UDP 842 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) { 843 if (tipc_udp_nl_add_bearer_data(msg, bearer)) 844 goto attr_msg_full; 845 } 846 #endif 847 848 nla_nest_end(msg->skb, attrs); 849 genlmsg_end(msg->skb, hdr); 850 851 return 0; 852 853 prop_msg_full: 854 nla_nest_cancel(msg->skb, prop); 855 attr_msg_full: 856 nla_nest_cancel(msg->skb, attrs); 857 msg_full: 858 genlmsg_cancel(msg->skb, hdr); 859 860 return -EMSGSIZE; 861 } 862 863 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 864 { 865 int err; 866 int i = cb->args[0]; 867 struct tipc_bearer *bearer; 868 struct tipc_nl_msg msg; 869 struct net *net = sock_net(skb->sk); 870 struct tipc_net *tn = net_generic(net, tipc_net_id); 871 872 if (i == MAX_BEARERS) 873 return 0; 874 875 msg.skb = skb; 876 msg.portid = NETLINK_CB(cb->skb).portid; 877 msg.seq = cb->nlh->nlmsg_seq; 878 879 rtnl_lock(); 880 for (i = 0; i < MAX_BEARERS; i++) { 881 bearer = rtnl_dereference(tn->bearer_list[i]); 882 if (!bearer) 883 continue; 884 885 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 886 if (err) 887 break; 888 } 889 rtnl_unlock(); 890 891 cb->args[0] = i; 892 return skb->len; 893 } 894 895 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 896 { 897 int err; 898 char *name; 899 struct sk_buff *rep; 900 struct tipc_bearer *bearer; 901 struct tipc_nl_msg msg; 902 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 903 struct net *net = genl_info_net(info); 904 905 if (!info->attrs[TIPC_NLA_BEARER]) 906 return -EINVAL; 907 908 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, 909 info->attrs[TIPC_NLA_BEARER], 910 tipc_nl_bearer_policy, info->extack); 911 if (err) 912 return err; 913 914 if (!attrs[TIPC_NLA_BEARER_NAME]) 915 return -EINVAL; 916 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 917 918 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 919 if (!rep) 920 return -ENOMEM; 921 922 msg.skb = rep; 923 msg.portid = info->snd_portid; 924 msg.seq = info->snd_seq; 925 926 rtnl_lock(); 927 bearer = tipc_bearer_find(net, name); 928 if (!bearer) { 929 err = -EINVAL; 930 NL_SET_ERR_MSG(info->extack, "Bearer not found"); 931 goto err_out; 932 } 933 934 err = __tipc_nl_add_bearer(&msg, bearer, 0); 935 if (err) 936 goto err_out; 937 rtnl_unlock(); 938 939 return genlmsg_reply(rep, info); 940 err_out: 941 rtnl_unlock(); 942 nlmsg_free(rep); 943 944 return err; 945 } 946 947 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 948 { 949 int err; 950 char *name; 951 struct tipc_bearer *bearer; 952 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 953 struct net *net = sock_net(skb->sk); 954 955 if (!info->attrs[TIPC_NLA_BEARER]) 956 return -EINVAL; 957 958 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, 959 info->attrs[TIPC_NLA_BEARER], 960 tipc_nl_bearer_policy, info->extack); 961 if (err) 962 return err; 963 964 if (!attrs[TIPC_NLA_BEARER_NAME]) 965 return -EINVAL; 966 967 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 968 969 bearer = tipc_bearer_find(net, name); 970 if (!bearer) { 971 NL_SET_ERR_MSG(info->extack, "Bearer not found"); 972 return -EINVAL; 973 } 974 975 bearer_disable(net, bearer); 976 977 return 0; 978 } 979 980 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 981 { 982 int err; 983 984 rtnl_lock(); 985 err = __tipc_nl_bearer_disable(skb, info); 986 rtnl_unlock(); 987 988 return err; 989 } 990 991 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 992 { 993 int err; 994 char *bearer; 995 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 996 struct net *net = sock_net(skb->sk); 997 u32 domain = 0; 998 u32 prio; 999 1000 prio = TIPC_MEDIA_LINK_PRI; 1001 1002 if (!info->attrs[TIPC_NLA_BEARER]) 1003 return -EINVAL; 1004 1005 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, 1006 info->attrs[TIPC_NLA_BEARER], 1007 tipc_nl_bearer_policy, info->extack); 1008 if (err) 1009 return err; 1010 1011 if (!attrs[TIPC_NLA_BEARER_NAME]) 1012 return -EINVAL; 1013 1014 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 1015 1016 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 1017 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 1018 1019 if (attrs[TIPC_NLA_BEARER_PROP]) { 1020 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1021 1022 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 1023 props); 1024 if (err) 1025 return err; 1026 1027 if (props[TIPC_NLA_PROP_PRIO]) 1028 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1029 } 1030 1031 return tipc_enable_bearer(net, bearer, domain, prio, attrs, 1032 info->extack); 1033 } 1034 1035 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 1036 { 1037 int err; 1038 1039 rtnl_lock(); 1040 err = __tipc_nl_bearer_enable(skb, info); 1041 rtnl_unlock(); 1042 1043 return err; 1044 } 1045 1046 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info) 1047 { 1048 int err; 1049 char *name; 1050 struct tipc_bearer *b; 1051 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1052 struct net *net = sock_net(skb->sk); 1053 1054 if (!info->attrs[TIPC_NLA_BEARER]) 1055 return -EINVAL; 1056 1057 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, 1058 info->attrs[TIPC_NLA_BEARER], 1059 tipc_nl_bearer_policy, info->extack); 1060 if (err) 1061 return err; 1062 1063 if (!attrs[TIPC_NLA_BEARER_NAME]) 1064 return -EINVAL; 1065 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 1066 1067 rtnl_lock(); 1068 b = tipc_bearer_find(net, name); 1069 if (!b) { 1070 rtnl_unlock(); 1071 NL_SET_ERR_MSG(info->extack, "Bearer not found"); 1072 return -EINVAL; 1073 } 1074 1075 #ifdef CONFIG_TIPC_MEDIA_UDP 1076 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) { 1077 err = tipc_udp_nl_bearer_add(b, 1078 attrs[TIPC_NLA_BEARER_UDP_OPTS]); 1079 if (err) { 1080 rtnl_unlock(); 1081 return err; 1082 } 1083 } 1084 #endif 1085 rtnl_unlock(); 1086 1087 return 0; 1088 } 1089 1090 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 1091 { 1092 struct tipc_bearer *b; 1093 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1094 struct net *net = sock_net(skb->sk); 1095 char *name; 1096 int err; 1097 1098 if (!info->attrs[TIPC_NLA_BEARER]) 1099 return -EINVAL; 1100 1101 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, 1102 info->attrs[TIPC_NLA_BEARER], 1103 tipc_nl_bearer_policy, info->extack); 1104 if (err) 1105 return err; 1106 1107 if (!attrs[TIPC_NLA_BEARER_NAME]) 1108 return -EINVAL; 1109 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 1110 1111 b = tipc_bearer_find(net, name); 1112 if (!b) { 1113 NL_SET_ERR_MSG(info->extack, "Bearer not found"); 1114 return -EINVAL; 1115 } 1116 1117 if (attrs[TIPC_NLA_BEARER_PROP]) { 1118 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1119 1120 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 1121 props); 1122 if (err) 1123 return err; 1124 1125 if (props[TIPC_NLA_PROP_TOL]) { 1126 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1127 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL); 1128 } 1129 if (props[TIPC_NLA_PROP_PRIO]) 1130 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1131 if (props[TIPC_NLA_PROP_WIN]) 1132 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1133 if (props[TIPC_NLA_PROP_MTU]) { 1134 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) { 1135 NL_SET_ERR_MSG(info->extack, 1136 "MTU property is unsupported"); 1137 return -EINVAL; 1138 } 1139 #ifdef CONFIG_TIPC_MEDIA_UDP 1140 if (tipc_udp_mtu_bad(nla_get_u32 1141 (props[TIPC_NLA_PROP_MTU]))) { 1142 NL_SET_ERR_MSG(info->extack, 1143 "MTU value is out-of-range"); 1144 return -EINVAL; 1145 } 1146 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); 1147 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU); 1148 #endif 1149 } 1150 } 1151 1152 return 0; 1153 } 1154 1155 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 1156 { 1157 int err; 1158 1159 rtnl_lock(); 1160 err = __tipc_nl_bearer_set(skb, info); 1161 rtnl_unlock(); 1162 1163 return err; 1164 } 1165 1166 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 1167 struct tipc_media *media, int nlflags) 1168 { 1169 void *hdr; 1170 struct nlattr *attrs; 1171 struct nlattr *prop; 1172 1173 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 1174 nlflags, TIPC_NL_MEDIA_GET); 1175 if (!hdr) 1176 return -EMSGSIZE; 1177 1178 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA); 1179 if (!attrs) 1180 goto msg_full; 1181 1182 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 1183 goto attr_msg_full; 1184 1185 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP); 1186 if (!prop) 1187 goto prop_msg_full; 1188 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 1189 goto prop_msg_full; 1190 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 1191 goto prop_msg_full; 1192 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win)) 1193 goto prop_msg_full; 1194 if (media->type_id == TIPC_MEDIA_TYPE_UDP) 1195 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu)) 1196 goto prop_msg_full; 1197 1198 nla_nest_end(msg->skb, prop); 1199 nla_nest_end(msg->skb, attrs); 1200 genlmsg_end(msg->skb, hdr); 1201 1202 return 0; 1203 1204 prop_msg_full: 1205 nla_nest_cancel(msg->skb, prop); 1206 attr_msg_full: 1207 nla_nest_cancel(msg->skb, attrs); 1208 msg_full: 1209 genlmsg_cancel(msg->skb, hdr); 1210 1211 return -EMSGSIZE; 1212 } 1213 1214 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 1215 { 1216 int err; 1217 int i = cb->args[0]; 1218 struct tipc_nl_msg msg; 1219 1220 if (i == MAX_MEDIA) 1221 return 0; 1222 1223 msg.skb = skb; 1224 msg.portid = NETLINK_CB(cb->skb).portid; 1225 msg.seq = cb->nlh->nlmsg_seq; 1226 1227 rtnl_lock(); 1228 for (; media_info_array[i] != NULL; i++) { 1229 err = __tipc_nl_add_media(&msg, media_info_array[i], 1230 NLM_F_MULTI); 1231 if (err) 1232 break; 1233 } 1234 rtnl_unlock(); 1235 1236 cb->args[0] = i; 1237 return skb->len; 1238 } 1239 1240 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 1241 { 1242 int err; 1243 char *name; 1244 struct tipc_nl_msg msg; 1245 struct tipc_media *media; 1246 struct sk_buff *rep; 1247 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1248 1249 if (!info->attrs[TIPC_NLA_MEDIA]) 1250 return -EINVAL; 1251 1252 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX, 1253 info->attrs[TIPC_NLA_MEDIA], 1254 tipc_nl_media_policy, info->extack); 1255 if (err) 1256 return err; 1257 1258 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1259 return -EINVAL; 1260 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1261 1262 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1263 if (!rep) 1264 return -ENOMEM; 1265 1266 msg.skb = rep; 1267 msg.portid = info->snd_portid; 1268 msg.seq = info->snd_seq; 1269 1270 rtnl_lock(); 1271 media = tipc_media_find(name); 1272 if (!media) { 1273 NL_SET_ERR_MSG(info->extack, "Media not found"); 1274 err = -EINVAL; 1275 goto err_out; 1276 } 1277 1278 err = __tipc_nl_add_media(&msg, media, 0); 1279 if (err) 1280 goto err_out; 1281 rtnl_unlock(); 1282 1283 return genlmsg_reply(rep, info); 1284 err_out: 1285 rtnl_unlock(); 1286 nlmsg_free(rep); 1287 1288 return err; 1289 } 1290 1291 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1292 { 1293 int err; 1294 char *name; 1295 struct tipc_media *m; 1296 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1297 1298 if (!info->attrs[TIPC_NLA_MEDIA]) 1299 return -EINVAL; 1300 1301 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX, 1302 info->attrs[TIPC_NLA_MEDIA], 1303 tipc_nl_media_policy, info->extack); 1304 1305 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1306 return -EINVAL; 1307 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1308 1309 m = tipc_media_find(name); 1310 if (!m) { 1311 NL_SET_ERR_MSG(info->extack, "Media not found"); 1312 return -EINVAL; 1313 } 1314 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1315 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1316 1317 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1318 props); 1319 if (err) 1320 return err; 1321 1322 if (props[TIPC_NLA_PROP_TOL]) 1323 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1324 if (props[TIPC_NLA_PROP_PRIO]) 1325 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1326 if (props[TIPC_NLA_PROP_WIN]) 1327 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1328 if (props[TIPC_NLA_PROP_MTU]) { 1329 if (m->type_id != TIPC_MEDIA_TYPE_UDP) { 1330 NL_SET_ERR_MSG(info->extack, 1331 "MTU property is unsupported"); 1332 return -EINVAL; 1333 } 1334 #ifdef CONFIG_TIPC_MEDIA_UDP 1335 if (tipc_udp_mtu_bad(nla_get_u32 1336 (props[TIPC_NLA_PROP_MTU]))) { 1337 NL_SET_ERR_MSG(info->extack, 1338 "MTU value is out-of-range"); 1339 return -EINVAL; 1340 } 1341 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); 1342 #endif 1343 } 1344 } 1345 1346 return 0; 1347 } 1348 1349 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1350 { 1351 int err; 1352 1353 rtnl_lock(); 1354 err = __tipc_nl_media_set(skb, info); 1355 rtnl_unlock(); 1356 1357 return err; 1358 } 1359