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 NL_SET_ERR_MSG(extack, "Illegal name"); 263 return res; 264 } 265 266 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) { 267 errstr = "illegal priority"; 268 NL_SET_ERR_MSG(extack, "Illegal priority"); 269 goto rejected; 270 } 271 272 m = tipc_media_find(b_names.media_name); 273 if (!m) { 274 errstr = "media not registered"; 275 NL_SET_ERR_MSG(extack, "Media not registered"); 276 goto rejected; 277 } 278 279 if (prio == TIPC_MEDIA_LINK_PRI) 280 prio = m->priority; 281 282 /* Check new bearer vs existing ones and find free bearer id if any */ 283 bearer_id = MAX_BEARERS; 284 i = MAX_BEARERS; 285 while (i-- != 0) { 286 b = rtnl_dereference(tn->bearer_list[i]); 287 if (!b) { 288 bearer_id = i; 289 continue; 290 } 291 if (!strcmp(name, b->name)) { 292 errstr = "already enabled"; 293 NL_SET_ERR_MSG(extack, "Already enabled"); 294 goto rejected; 295 } 296 297 if (b->priority == prio && 298 (++with_this_prio > 2)) { 299 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n", 300 name, prio); 301 302 if (prio == TIPC_MIN_LINK_PRI) { 303 errstr = "cannot adjust to lower"; 304 NL_SET_ERR_MSG(extack, "Cannot adjust to lower"); 305 goto rejected; 306 } 307 308 pr_warn("Bearer <%s>: trying with adjusted priority\n", 309 name); 310 prio--; 311 bearer_id = MAX_BEARERS; 312 i = MAX_BEARERS; 313 with_this_prio = 1; 314 } 315 } 316 317 if (bearer_id >= MAX_BEARERS) { 318 errstr = "max 3 bearers permitted"; 319 NL_SET_ERR_MSG(extack, "Max 3 bearers permitted"); 320 goto rejected; 321 } 322 323 b = kzalloc(sizeof(*b), GFP_ATOMIC); 324 if (!b) 325 return -ENOMEM; 326 327 strcpy(b->name, name); 328 b->media = m; 329 res = m->enable_media(net, b, attr); 330 if (res) { 331 kfree(b); 332 errstr = "failed to enable media"; 333 NL_SET_ERR_MSG(extack, "Failed to enable media"); 334 goto rejected; 335 } 336 337 b->identity = bearer_id; 338 b->tolerance = m->tolerance; 339 b->min_win = m->min_win; 340 b->max_win = m->max_win; 341 b->domain = disc_domain; 342 b->net_plane = bearer_id + 'A'; 343 b->priority = prio; 344 refcount_set(&b->refcnt, 1); 345 346 res = tipc_disc_create(net, b, &b->bcast_addr, &skb); 347 if (res) { 348 bearer_disable(net, b); 349 errstr = "failed to create discoverer"; 350 NL_SET_ERR_MSG(extack, "Failed to create discoverer"); 351 goto rejected; 352 } 353 354 /* Create monitoring data before accepting activate messages */ 355 if (tipc_mon_create(net, bearer_id)) { 356 bearer_disable(net, b); 357 kfree_skb(skb); 358 return -ENOMEM; 359 } 360 361 test_and_set_bit_lock(0, &b->up); 362 rcu_assign_pointer(tn->bearer_list[bearer_id], b); 363 if (skb) 364 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); 365 366 pr_info("Enabled bearer <%s>, priority %u\n", name, prio); 367 368 return res; 369 rejected: 370 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr); 371 return res; 372 } 373 374 /** 375 * tipc_reset_bearer - Reset all links established over this bearer 376 * @net: the applicable net namespace 377 * @b: the target bearer 378 */ 379 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) 380 { 381 pr_info("Resetting bearer <%s>\n", b->name); 382 tipc_node_delete_links(net, b->identity); 383 tipc_disc_reset(net, b); 384 return 0; 385 } 386 387 bool tipc_bearer_hold(struct tipc_bearer *b) 388 { 389 return (b && refcount_inc_not_zero(&b->refcnt)); 390 } 391 392 void tipc_bearer_put(struct tipc_bearer *b) 393 { 394 if (b && refcount_dec_and_test(&b->refcnt)) 395 kfree_rcu(b, rcu); 396 } 397 398 /** 399 * bearer_disable - disable this bearer 400 * @net: the applicable net namespace 401 * @b: the bearer to disable 402 * 403 * Note: This routine assumes caller holds RTNL lock. 404 */ 405 static void bearer_disable(struct net *net, struct tipc_bearer *b) 406 { 407 struct tipc_net *tn = tipc_net(net); 408 int bearer_id = b->identity; 409 410 pr_info("Disabling bearer <%s>\n", b->name); 411 clear_bit_unlock(0, &b->up); 412 tipc_node_delete_links(net, bearer_id); 413 b->media->disable_media(b); 414 RCU_INIT_POINTER(b->media_ptr, NULL); 415 if (b->disc) 416 tipc_disc_delete(b->disc); 417 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); 418 tipc_bearer_put(b); 419 tipc_mon_delete(net, bearer_id); 420 } 421 422 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 423 struct nlattr *attr[]) 424 { 425 char *dev_name = strchr((const char *)b->name, ':') + 1; 426 int hwaddr_len = b->media->hwaddr_len; 427 u8 node_id[NODE_ID_LEN] = {0,}; 428 struct net_device *dev; 429 430 /* Find device with specified name */ 431 dev = dev_get_by_name(net, dev_name); 432 if (!dev) 433 return -ENODEV; 434 if (tipc_mtu_bad(dev, 0)) { 435 dev_put(dev); 436 return -EINVAL; 437 } 438 if (dev == net->loopback_dev) { 439 dev_put(dev); 440 pr_info("Enabling <%s> not permitted\n", b->name); 441 return -EINVAL; 442 } 443 444 /* Autoconfigure own node identity if needed */ 445 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) { 446 memcpy(node_id, dev->dev_addr, hwaddr_len); 447 tipc_net_init(net, node_id, 0); 448 } 449 if (!tipc_own_id(net)) { 450 dev_put(dev); 451 pr_warn("Failed to obtain node identity\n"); 452 return -EINVAL; 453 } 454 455 /* Associate TIPC bearer with L2 bearer */ 456 rcu_assign_pointer(b->media_ptr, dev); 457 b->pt.dev = dev; 458 b->pt.type = htons(ETH_P_TIPC); 459 b->pt.func = tipc_l2_rcv_msg; 460 dev_add_pack(&b->pt); 461 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 462 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len); 463 b->bcast_addr.media_id = b->media->type_id; 464 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 465 b->mtu = dev->mtu; 466 b->media->raw2addr(b, &b->addr, (const char *)dev->dev_addr); 467 rcu_assign_pointer(dev->tipc_ptr, b); 468 return 0; 469 } 470 471 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 472 * @b: the target bearer 473 * 474 * Mark L2 bearer as inactive so that incoming buffers are thrown away 475 */ 476 void tipc_disable_l2_media(struct tipc_bearer *b) 477 { 478 struct net_device *dev; 479 480 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 481 dev_remove_pack(&b->pt); 482 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 483 synchronize_net(); 484 dev_put(dev); 485 } 486 487 /** 488 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 489 * @net: the associated network namespace 490 * @skb: the packet to be sent 491 * @b: the bearer through which the packet is to be sent 492 * @dest: peer destination address 493 */ 494 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, 495 struct tipc_bearer *b, struct tipc_media_addr *dest) 496 { 497 struct net_device *dev; 498 int delta; 499 500 dev = (struct net_device *)rcu_dereference(b->media_ptr); 501 if (!dev) 502 return 0; 503 504 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); 505 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) { 506 kfree_skb(skb); 507 return 0; 508 } 509 skb_reset_network_header(skb); 510 skb->dev = dev; 511 skb->protocol = htons(ETH_P_TIPC); 512 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, 513 dev->dev_addr, skb->len); 514 dev_queue_xmit(skb); 515 return 0; 516 } 517 518 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id) 519 { 520 bool supp = false; 521 struct tipc_bearer *b; 522 523 rcu_read_lock(); 524 b = bearer_get(net, bearer_id); 525 if (b) 526 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT); 527 rcu_read_unlock(); 528 return supp; 529 } 530 531 int tipc_bearer_mtu(struct net *net, u32 bearer_id) 532 { 533 int mtu = 0; 534 struct tipc_bearer *b; 535 536 rcu_read_lock(); 537 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]); 538 if (b) 539 mtu = b->mtu; 540 rcu_read_unlock(); 541 return mtu; 542 } 543 544 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer 545 */ 546 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, 547 struct sk_buff *skb, 548 struct tipc_media_addr *dest) 549 { 550 struct tipc_msg *hdr = buf_msg(skb); 551 struct tipc_bearer *b; 552 553 rcu_read_lock(); 554 b = bearer_get(net, bearer_id); 555 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) { 556 #ifdef CONFIG_TIPC_CRYPTO 557 tipc_crypto_xmit(net, &skb, b, dest, NULL); 558 if (skb) 559 #endif 560 b->media->send_msg(net, skb, b, dest); 561 } else { 562 kfree_skb(skb); 563 } 564 rcu_read_unlock(); 565 } 566 567 /* tipc_bearer_xmit() -send buffer to destination over bearer 568 */ 569 void tipc_bearer_xmit(struct net *net, u32 bearer_id, 570 struct sk_buff_head *xmitq, 571 struct tipc_media_addr *dst, 572 struct tipc_node *__dnode) 573 { 574 struct tipc_bearer *b; 575 struct sk_buff *skb, *tmp; 576 577 if (skb_queue_empty(xmitq)) 578 return; 579 580 rcu_read_lock(); 581 b = bearer_get(net, bearer_id); 582 if (unlikely(!b)) 583 __skb_queue_purge(xmitq); 584 skb_queue_walk_safe(xmitq, skb, tmp) { 585 __skb_dequeue(xmitq); 586 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) { 587 #ifdef CONFIG_TIPC_CRYPTO 588 tipc_crypto_xmit(net, &skb, b, dst, __dnode); 589 if (skb) 590 #endif 591 b->media->send_msg(net, skb, b, dst); 592 } else { 593 kfree_skb(skb); 594 } 595 } 596 rcu_read_unlock(); 597 } 598 599 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations 600 */ 601 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 602 struct sk_buff_head *xmitq) 603 { 604 struct tipc_net *tn = tipc_net(net); 605 struct tipc_media_addr *dst; 606 int net_id = tn->net_id; 607 struct tipc_bearer *b; 608 struct sk_buff *skb, *tmp; 609 struct tipc_msg *hdr; 610 611 rcu_read_lock(); 612 b = bearer_get(net, bearer_id); 613 if (unlikely(!b || !test_bit(0, &b->up))) 614 __skb_queue_purge(xmitq); 615 skb_queue_walk_safe(xmitq, skb, tmp) { 616 hdr = buf_msg(skb); 617 msg_set_non_seq(hdr, 1); 618 msg_set_mc_netid(hdr, net_id); 619 __skb_dequeue(xmitq); 620 dst = &b->bcast_addr; 621 #ifdef CONFIG_TIPC_CRYPTO 622 tipc_crypto_xmit(net, &skb, b, dst, NULL); 623 if (skb) 624 #endif 625 b->media->send_msg(net, skb, b, dst); 626 } 627 rcu_read_unlock(); 628 } 629 630 /** 631 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 632 * @skb: the received message 633 * @dev: the net device that the packet was received on 634 * @pt: the packet_type structure which was used to register this handler 635 * @orig_dev: the original receive net device in case the device is a bond 636 * 637 * Accept only packets explicitly sent to this node, or broadcast packets; 638 * ignores packets sent using interface multicast, and traffic sent to other 639 * nodes (which can happen if interface is running in promiscuous mode). 640 */ 641 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, 642 struct packet_type *pt, struct net_device *orig_dev) 643 { 644 struct tipc_bearer *b; 645 646 rcu_read_lock(); 647 b = rcu_dereference(dev->tipc_ptr) ?: 648 rcu_dereference(orig_dev->tipc_ptr); 649 if (likely(b && test_bit(0, &b->up) && 650 (skb->pkt_type <= PACKET_MULTICAST))) { 651 skb_mark_not_on_list(skb); 652 TIPC_SKB_CB(skb)->flags = 0; 653 tipc_rcv(dev_net(b->pt.dev), skb, b); 654 rcu_read_unlock(); 655 return NET_RX_SUCCESS; 656 } 657 rcu_read_unlock(); 658 kfree_skb(skb); 659 return NET_RX_DROP; 660 } 661 662 /** 663 * tipc_l2_device_event - handle device events from network device 664 * @nb: the context of the notification 665 * @evt: the type of event 666 * @ptr: the net device that the event was on 667 * 668 * This function is called by the Ethernet driver in case of link 669 * change event. 670 */ 671 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 672 void *ptr) 673 { 674 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 675 struct net *net = dev_net(dev); 676 struct tipc_bearer *b; 677 678 b = rtnl_dereference(dev->tipc_ptr); 679 if (!b) 680 return NOTIFY_DONE; 681 682 trace_tipc_l2_device_event(dev, b, evt); 683 switch (evt) { 684 case NETDEV_CHANGE: 685 if (netif_carrier_ok(dev) && netif_oper_up(dev)) { 686 test_and_set_bit_lock(0, &b->up); 687 break; 688 } 689 fallthrough; 690 case NETDEV_GOING_DOWN: 691 clear_bit_unlock(0, &b->up); 692 tipc_reset_bearer(net, b); 693 break; 694 case NETDEV_UP: 695 test_and_set_bit_lock(0, &b->up); 696 break; 697 case NETDEV_CHANGEMTU: 698 if (tipc_mtu_bad(dev, 0)) { 699 bearer_disable(net, b); 700 break; 701 } 702 b->mtu = dev->mtu; 703 tipc_reset_bearer(net, b); 704 break; 705 case NETDEV_CHANGEADDR: 706 b->media->raw2addr(b, &b->addr, 707 (const char *)dev->dev_addr); 708 tipc_reset_bearer(net, b); 709 break; 710 case NETDEV_UNREGISTER: 711 case NETDEV_CHANGENAME: 712 bearer_disable(net, b); 713 break; 714 } 715 return NOTIFY_OK; 716 } 717 718 static struct notifier_block notifier = { 719 .notifier_call = tipc_l2_device_event, 720 .priority = 0, 721 }; 722 723 int tipc_bearer_setup(void) 724 { 725 return register_netdevice_notifier(¬ifier); 726 } 727 728 void tipc_bearer_cleanup(void) 729 { 730 unregister_netdevice_notifier(¬ifier); 731 } 732 733 void tipc_bearer_stop(struct net *net) 734 { 735 struct tipc_net *tn = net_generic(net, tipc_net_id); 736 struct tipc_bearer *b; 737 u32 i; 738 739 for (i = 0; i < MAX_BEARERS; i++) { 740 b = rtnl_dereference(tn->bearer_list[i]); 741 if (b) { 742 bearer_disable(net, b); 743 tn->bearer_list[i] = NULL; 744 } 745 } 746 } 747 748 void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts) 749 { 750 struct net_device *dev = net->loopback_dev; 751 struct sk_buff *skb, *_skb; 752 int exp; 753 754 skb_queue_walk(pkts, _skb) { 755 skb = pskb_copy(_skb, GFP_ATOMIC); 756 if (!skb) 757 continue; 758 759 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); 760 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) { 761 kfree_skb(skb); 762 continue; 763 } 764 765 skb_reset_network_header(skb); 766 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr, 767 dev->dev_addr, skb->len); 768 skb->dev = dev; 769 skb->pkt_type = PACKET_HOST; 770 skb->ip_summed = CHECKSUM_UNNECESSARY; 771 skb->protocol = eth_type_trans(skb, dev); 772 netif_rx(skb); 773 } 774 } 775 776 static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev, 777 struct packet_type *pt, struct net_device *od) 778 { 779 consume_skb(skb); 780 return NET_RX_SUCCESS; 781 } 782 783 int tipc_attach_loopback(struct net *net) 784 { 785 struct net_device *dev = net->loopback_dev; 786 struct tipc_net *tn = tipc_net(net); 787 788 if (!dev) 789 return -ENODEV; 790 791 netdev_hold(dev, &tn->loopback_pt.dev_tracker, GFP_KERNEL); 792 tn->loopback_pt.dev = dev; 793 tn->loopback_pt.type = htons(ETH_P_TIPC); 794 tn->loopback_pt.func = tipc_loopback_rcv_pkt; 795 dev_add_pack(&tn->loopback_pt); 796 return 0; 797 } 798 799 void tipc_detach_loopback(struct net *net) 800 { 801 struct tipc_net *tn = tipc_net(net); 802 803 dev_remove_pack(&tn->loopback_pt); 804 netdev_put(net->loopback_dev, &tn->loopback_pt.dev_tracker); 805 } 806 807 /* Caller should hold rtnl_lock to protect the bearer */ 808 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 809 struct tipc_bearer *bearer, int nlflags) 810 { 811 void *hdr; 812 struct nlattr *attrs; 813 struct nlattr *prop; 814 815 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 816 nlflags, TIPC_NL_BEARER_GET); 817 if (!hdr) 818 return -EMSGSIZE; 819 820 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER); 821 if (!attrs) 822 goto msg_full; 823 824 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 825 goto attr_msg_full; 826 827 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP); 828 if (!prop) 829 goto prop_msg_full; 830 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 831 goto prop_msg_full; 832 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 833 goto prop_msg_full; 834 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win)) 835 goto prop_msg_full; 836 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) 837 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu)) 838 goto prop_msg_full; 839 840 nla_nest_end(msg->skb, prop); 841 842 #ifdef CONFIG_TIPC_MEDIA_UDP 843 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) { 844 if (tipc_udp_nl_add_bearer_data(msg, bearer)) 845 goto attr_msg_full; 846 } 847 #endif 848 849 nla_nest_end(msg->skb, attrs); 850 genlmsg_end(msg->skb, hdr); 851 852 return 0; 853 854 prop_msg_full: 855 nla_nest_cancel(msg->skb, prop); 856 attr_msg_full: 857 nla_nest_cancel(msg->skb, attrs); 858 msg_full: 859 genlmsg_cancel(msg->skb, hdr); 860 861 return -EMSGSIZE; 862 } 863 864 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 865 { 866 int err; 867 int i = cb->args[0]; 868 struct tipc_bearer *bearer; 869 struct tipc_nl_msg msg; 870 struct net *net = sock_net(skb->sk); 871 struct tipc_net *tn = net_generic(net, tipc_net_id); 872 873 if (i == MAX_BEARERS) 874 return 0; 875 876 msg.skb = skb; 877 msg.portid = NETLINK_CB(cb->skb).portid; 878 msg.seq = cb->nlh->nlmsg_seq; 879 880 rtnl_lock(); 881 for (i = 0; i < MAX_BEARERS; i++) { 882 bearer = rtnl_dereference(tn->bearer_list[i]); 883 if (!bearer) 884 continue; 885 886 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 887 if (err) 888 break; 889 } 890 rtnl_unlock(); 891 892 cb->args[0] = i; 893 return skb->len; 894 } 895 896 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 897 { 898 int err; 899 char *name; 900 struct sk_buff *rep; 901 struct tipc_bearer *bearer; 902 struct tipc_nl_msg msg; 903 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 904 struct net *net = genl_info_net(info); 905 906 if (!info->attrs[TIPC_NLA_BEARER]) 907 return -EINVAL; 908 909 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, 910 info->attrs[TIPC_NLA_BEARER], 911 tipc_nl_bearer_policy, info->extack); 912 if (err) 913 return err; 914 915 if (!attrs[TIPC_NLA_BEARER_NAME]) 916 return -EINVAL; 917 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 918 919 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 920 if (!rep) 921 return -ENOMEM; 922 923 msg.skb = rep; 924 msg.portid = info->snd_portid; 925 msg.seq = info->snd_seq; 926 927 rtnl_lock(); 928 bearer = tipc_bearer_find(net, name); 929 if (!bearer) { 930 err = -EINVAL; 931 NL_SET_ERR_MSG(info->extack, "Bearer not found"); 932 goto err_out; 933 } 934 935 err = __tipc_nl_add_bearer(&msg, bearer, 0); 936 if (err) 937 goto err_out; 938 rtnl_unlock(); 939 940 return genlmsg_reply(rep, info); 941 err_out: 942 rtnl_unlock(); 943 nlmsg_free(rep); 944 945 return err; 946 } 947 948 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 949 { 950 int err; 951 char *name; 952 struct tipc_bearer *bearer; 953 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 954 struct net *net = sock_net(skb->sk); 955 956 if (!info->attrs[TIPC_NLA_BEARER]) 957 return -EINVAL; 958 959 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, 960 info->attrs[TIPC_NLA_BEARER], 961 tipc_nl_bearer_policy, info->extack); 962 if (err) 963 return err; 964 965 if (!attrs[TIPC_NLA_BEARER_NAME]) 966 return -EINVAL; 967 968 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 969 970 bearer = tipc_bearer_find(net, name); 971 if (!bearer) { 972 NL_SET_ERR_MSG(info->extack, "Bearer not found"); 973 return -EINVAL; 974 } 975 976 bearer_disable(net, bearer); 977 978 return 0; 979 } 980 981 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 982 { 983 int err; 984 985 rtnl_lock(); 986 err = __tipc_nl_bearer_disable(skb, info); 987 rtnl_unlock(); 988 989 return err; 990 } 991 992 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 993 { 994 int err; 995 char *bearer; 996 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 997 struct net *net = sock_net(skb->sk); 998 u32 domain = 0; 999 u32 prio; 1000 1001 prio = TIPC_MEDIA_LINK_PRI; 1002 1003 if (!info->attrs[TIPC_NLA_BEARER]) 1004 return -EINVAL; 1005 1006 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, 1007 info->attrs[TIPC_NLA_BEARER], 1008 tipc_nl_bearer_policy, info->extack); 1009 if (err) 1010 return err; 1011 1012 if (!attrs[TIPC_NLA_BEARER_NAME]) 1013 return -EINVAL; 1014 1015 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 1016 1017 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 1018 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 1019 1020 if (attrs[TIPC_NLA_BEARER_PROP]) { 1021 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1022 1023 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 1024 props); 1025 if (err) 1026 return err; 1027 1028 if (props[TIPC_NLA_PROP_PRIO]) 1029 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1030 } 1031 1032 return tipc_enable_bearer(net, bearer, domain, prio, attrs, 1033 info->extack); 1034 } 1035 1036 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 1037 { 1038 int err; 1039 1040 rtnl_lock(); 1041 err = __tipc_nl_bearer_enable(skb, info); 1042 rtnl_unlock(); 1043 1044 return err; 1045 } 1046 1047 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info) 1048 { 1049 int err; 1050 char *name; 1051 struct tipc_bearer *b; 1052 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1053 struct net *net = sock_net(skb->sk); 1054 1055 if (!info->attrs[TIPC_NLA_BEARER]) 1056 return -EINVAL; 1057 1058 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, 1059 info->attrs[TIPC_NLA_BEARER], 1060 tipc_nl_bearer_policy, info->extack); 1061 if (err) 1062 return err; 1063 1064 if (!attrs[TIPC_NLA_BEARER_NAME]) 1065 return -EINVAL; 1066 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 1067 1068 rtnl_lock(); 1069 b = tipc_bearer_find(net, name); 1070 if (!b) { 1071 rtnl_unlock(); 1072 NL_SET_ERR_MSG(info->extack, "Bearer not found"); 1073 return -EINVAL; 1074 } 1075 1076 #ifdef CONFIG_TIPC_MEDIA_UDP 1077 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) { 1078 err = tipc_udp_nl_bearer_add(b, 1079 attrs[TIPC_NLA_BEARER_UDP_OPTS]); 1080 if (err) { 1081 rtnl_unlock(); 1082 return err; 1083 } 1084 } 1085 #endif 1086 rtnl_unlock(); 1087 1088 return 0; 1089 } 1090 1091 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 1092 { 1093 struct tipc_bearer *b; 1094 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1095 struct net *net = sock_net(skb->sk); 1096 char *name; 1097 int err; 1098 1099 if (!info->attrs[TIPC_NLA_BEARER]) 1100 return -EINVAL; 1101 1102 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, 1103 info->attrs[TIPC_NLA_BEARER], 1104 tipc_nl_bearer_policy, info->extack); 1105 if (err) 1106 return err; 1107 1108 if (!attrs[TIPC_NLA_BEARER_NAME]) 1109 return -EINVAL; 1110 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 1111 1112 b = tipc_bearer_find(net, name); 1113 if (!b) { 1114 NL_SET_ERR_MSG(info->extack, "Bearer not found"); 1115 return -EINVAL; 1116 } 1117 1118 if (attrs[TIPC_NLA_BEARER_PROP]) { 1119 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1120 1121 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 1122 props); 1123 if (err) 1124 return err; 1125 1126 if (props[TIPC_NLA_PROP_TOL]) { 1127 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1128 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL); 1129 } 1130 if (props[TIPC_NLA_PROP_PRIO]) 1131 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1132 if (props[TIPC_NLA_PROP_WIN]) 1133 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1134 if (props[TIPC_NLA_PROP_MTU]) { 1135 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) { 1136 NL_SET_ERR_MSG(info->extack, 1137 "MTU property is unsupported"); 1138 return -EINVAL; 1139 } 1140 #ifdef CONFIG_TIPC_MEDIA_UDP 1141 if (tipc_udp_mtu_bad(nla_get_u32 1142 (props[TIPC_NLA_PROP_MTU]))) { 1143 NL_SET_ERR_MSG(info->extack, 1144 "MTU value is out-of-range"); 1145 return -EINVAL; 1146 } 1147 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); 1148 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU); 1149 #endif 1150 } 1151 } 1152 1153 return 0; 1154 } 1155 1156 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 1157 { 1158 int err; 1159 1160 rtnl_lock(); 1161 err = __tipc_nl_bearer_set(skb, info); 1162 rtnl_unlock(); 1163 1164 return err; 1165 } 1166 1167 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 1168 struct tipc_media *media, int nlflags) 1169 { 1170 void *hdr; 1171 struct nlattr *attrs; 1172 struct nlattr *prop; 1173 1174 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 1175 nlflags, TIPC_NL_MEDIA_GET); 1176 if (!hdr) 1177 return -EMSGSIZE; 1178 1179 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA); 1180 if (!attrs) 1181 goto msg_full; 1182 1183 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 1184 goto attr_msg_full; 1185 1186 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP); 1187 if (!prop) 1188 goto prop_msg_full; 1189 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 1190 goto prop_msg_full; 1191 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 1192 goto prop_msg_full; 1193 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win)) 1194 goto prop_msg_full; 1195 if (media->type_id == TIPC_MEDIA_TYPE_UDP) 1196 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu)) 1197 goto prop_msg_full; 1198 1199 nla_nest_end(msg->skb, prop); 1200 nla_nest_end(msg->skb, attrs); 1201 genlmsg_end(msg->skb, hdr); 1202 1203 return 0; 1204 1205 prop_msg_full: 1206 nla_nest_cancel(msg->skb, prop); 1207 attr_msg_full: 1208 nla_nest_cancel(msg->skb, attrs); 1209 msg_full: 1210 genlmsg_cancel(msg->skb, hdr); 1211 1212 return -EMSGSIZE; 1213 } 1214 1215 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 1216 { 1217 int err; 1218 int i = cb->args[0]; 1219 struct tipc_nl_msg msg; 1220 1221 if (i == MAX_MEDIA) 1222 return 0; 1223 1224 msg.skb = skb; 1225 msg.portid = NETLINK_CB(cb->skb).portid; 1226 msg.seq = cb->nlh->nlmsg_seq; 1227 1228 rtnl_lock(); 1229 for (; media_info_array[i] != NULL; i++) { 1230 err = __tipc_nl_add_media(&msg, media_info_array[i], 1231 NLM_F_MULTI); 1232 if (err) 1233 break; 1234 } 1235 rtnl_unlock(); 1236 1237 cb->args[0] = i; 1238 return skb->len; 1239 } 1240 1241 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 1242 { 1243 int err; 1244 char *name; 1245 struct tipc_nl_msg msg; 1246 struct tipc_media *media; 1247 struct sk_buff *rep; 1248 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1249 1250 if (!info->attrs[TIPC_NLA_MEDIA]) 1251 return -EINVAL; 1252 1253 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX, 1254 info->attrs[TIPC_NLA_MEDIA], 1255 tipc_nl_media_policy, info->extack); 1256 if (err) 1257 return err; 1258 1259 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1260 return -EINVAL; 1261 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1262 1263 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1264 if (!rep) 1265 return -ENOMEM; 1266 1267 msg.skb = rep; 1268 msg.portid = info->snd_portid; 1269 msg.seq = info->snd_seq; 1270 1271 rtnl_lock(); 1272 media = tipc_media_find(name); 1273 if (!media) { 1274 NL_SET_ERR_MSG(info->extack, "Media not found"); 1275 err = -EINVAL; 1276 goto err_out; 1277 } 1278 1279 err = __tipc_nl_add_media(&msg, media, 0); 1280 if (err) 1281 goto err_out; 1282 rtnl_unlock(); 1283 1284 return genlmsg_reply(rep, info); 1285 err_out: 1286 rtnl_unlock(); 1287 nlmsg_free(rep); 1288 1289 return err; 1290 } 1291 1292 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1293 { 1294 int err; 1295 char *name; 1296 struct tipc_media *m; 1297 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1298 1299 if (!info->attrs[TIPC_NLA_MEDIA]) 1300 return -EINVAL; 1301 1302 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX, 1303 info->attrs[TIPC_NLA_MEDIA], 1304 tipc_nl_media_policy, info->extack); 1305 1306 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1307 return -EINVAL; 1308 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1309 1310 m = tipc_media_find(name); 1311 if (!m) { 1312 NL_SET_ERR_MSG(info->extack, "Media not found"); 1313 return -EINVAL; 1314 } 1315 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1316 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1317 1318 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1319 props); 1320 if (err) 1321 return err; 1322 1323 if (props[TIPC_NLA_PROP_TOL]) 1324 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1325 if (props[TIPC_NLA_PROP_PRIO]) 1326 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1327 if (props[TIPC_NLA_PROP_WIN]) 1328 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1329 if (props[TIPC_NLA_PROP_MTU]) { 1330 if (m->type_id != TIPC_MEDIA_TYPE_UDP) { 1331 NL_SET_ERR_MSG(info->extack, 1332 "MTU property is unsupported"); 1333 return -EINVAL; 1334 } 1335 #ifdef CONFIG_TIPC_MEDIA_UDP 1336 if (tipc_udp_mtu_bad(nla_get_u32 1337 (props[TIPC_NLA_PROP_MTU]))) { 1338 NL_SET_ERR_MSG(info->extack, 1339 "MTU value is out-of-range"); 1340 return -EINVAL; 1341 } 1342 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); 1343 #endif 1344 } 1345 } 1346 1347 return 0; 1348 } 1349 1350 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1351 { 1352 int err; 1353 1354 rtnl_lock(); 1355 err = __tipc_nl_media_set(skb, info); 1356 rtnl_unlock(); 1357 1358 return err; 1359 } 1360