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 47 #define MAX_ADDR_STR 60 48 49 static struct tipc_media * const media_info_array[] = { 50 ð_media_info, 51 #ifdef CONFIG_TIPC_MEDIA_IB 52 &ib_media_info, 53 #endif 54 #ifdef CONFIG_TIPC_MEDIA_UDP 55 &udp_media_info, 56 #endif 57 NULL 58 }; 59 60 static struct tipc_bearer *bearer_get(struct net *net, int bearer_id) 61 { 62 struct tipc_net *tn = tipc_net(net); 63 64 return rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 65 } 66 67 static void bearer_disable(struct net *net, struct tipc_bearer *b); 68 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, 69 struct packet_type *pt, struct net_device *orig_dev); 70 71 /** 72 * tipc_media_find - locates specified media object by name 73 */ 74 struct tipc_media *tipc_media_find(const char *name) 75 { 76 u32 i; 77 78 for (i = 0; media_info_array[i] != NULL; i++) { 79 if (!strcmp(media_info_array[i]->name, name)) 80 break; 81 } 82 return media_info_array[i]; 83 } 84 85 /** 86 * media_find_id - locates specified media object by type identifier 87 */ 88 static struct tipc_media *media_find_id(u8 type) 89 { 90 u32 i; 91 92 for (i = 0; media_info_array[i] != NULL; i++) { 93 if (media_info_array[i]->type_id == type) 94 break; 95 } 96 return media_info_array[i]; 97 } 98 99 /** 100 * tipc_media_addr_printf - record media address in print buffer 101 */ 102 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) 103 { 104 char addr_str[MAX_ADDR_STR]; 105 struct tipc_media *m; 106 int ret; 107 108 m = media_find_id(a->media_id); 109 110 if (m && !m->addr2str(a, addr_str, sizeof(addr_str))) 111 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str); 112 else { 113 u32 i; 114 115 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); 116 for (i = 0; i < sizeof(a->value); i++) 117 ret += scnprintf(buf - ret, len + ret, 118 "-%02x", a->value[i]); 119 } 120 } 121 122 /** 123 * bearer_name_validate - validate & (optionally) deconstruct bearer name 124 * @name: ptr to bearer name string 125 * @name_parts: ptr to area for bearer name components (or NULL if not needed) 126 * 127 * Returns 1 if bearer name is valid, otherwise 0. 128 */ 129 static int bearer_name_validate(const char *name, 130 struct tipc_bearer_names *name_parts) 131 { 132 char name_copy[TIPC_MAX_BEARER_NAME]; 133 char *media_name; 134 char *if_name; 135 u32 media_len; 136 u32 if_len; 137 138 /* copy bearer name & ensure length is OK */ 139 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; 140 /* need above in case non-Posix strncpy() doesn't pad with nulls */ 141 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); 142 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) 143 return 0; 144 145 /* ensure all component parts of bearer name are present */ 146 media_name = name_copy; 147 if_name = strchr(media_name, ':'); 148 if (if_name == NULL) 149 return 0; 150 *(if_name++) = 0; 151 media_len = if_name - media_name; 152 if_len = strlen(if_name) + 1; 153 154 /* validate component parts of bearer name */ 155 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || 156 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) 157 return 0; 158 159 /* return bearer name components, if necessary */ 160 if (name_parts) { 161 strcpy(name_parts->media_name, media_name); 162 strcpy(name_parts->if_name, if_name); 163 } 164 return 1; 165 } 166 167 /** 168 * tipc_bearer_find - locates bearer object with matching bearer name 169 */ 170 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) 171 { 172 struct tipc_net *tn = net_generic(net, tipc_net_id); 173 struct tipc_bearer *b; 174 u32 i; 175 176 for (i = 0; i < MAX_BEARERS; i++) { 177 b = rtnl_dereference(tn->bearer_list[i]); 178 if (b && (!strcmp(b->name, name))) 179 return b; 180 } 181 return NULL; 182 } 183 184 /* tipc_bearer_get_name - get the bearer name from its id. 185 * @net: network namespace 186 * @name: a pointer to the buffer where the name will be stored. 187 * @bearer_id: the id to get the name from. 188 */ 189 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id) 190 { 191 struct tipc_net *tn = tipc_net(net); 192 struct tipc_bearer *b; 193 194 if (bearer_id >= MAX_BEARERS) 195 return -EINVAL; 196 197 b = rtnl_dereference(tn->bearer_list[bearer_id]); 198 if (!b) 199 return -EINVAL; 200 201 strcpy(name, b->name); 202 return 0; 203 } 204 205 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) 206 { 207 struct tipc_net *tn = net_generic(net, tipc_net_id); 208 struct tipc_bearer *b; 209 210 rcu_read_lock(); 211 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 212 if (b) 213 tipc_disc_add_dest(b->disc); 214 rcu_read_unlock(); 215 } 216 217 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) 218 { 219 struct tipc_net *tn = net_generic(net, tipc_net_id); 220 struct tipc_bearer *b; 221 222 rcu_read_lock(); 223 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 224 if (b) 225 tipc_disc_remove_dest(b->disc); 226 rcu_read_unlock(); 227 } 228 229 /** 230 * tipc_enable_bearer - enable bearer with the given name 231 */ 232 static int tipc_enable_bearer(struct net *net, const char *name, 233 u32 disc_domain, u32 prio, 234 struct nlattr *attr[]) 235 { 236 struct tipc_net *tn = tipc_net(net); 237 struct tipc_bearer_names b_names; 238 int with_this_prio = 1; 239 struct tipc_bearer *b; 240 struct tipc_media *m; 241 struct sk_buff *skb; 242 int bearer_id = 0; 243 int res = -EINVAL; 244 char *errstr = ""; 245 246 if (!bearer_name_validate(name, &b_names)) { 247 errstr = "illegal name"; 248 goto rejected; 249 } 250 251 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) { 252 errstr = "illegal priority"; 253 goto rejected; 254 } 255 256 m = tipc_media_find(b_names.media_name); 257 if (!m) { 258 errstr = "media not registered"; 259 goto rejected; 260 } 261 262 if (prio == TIPC_MEDIA_LINK_PRI) 263 prio = m->priority; 264 265 /* Check new bearer vs existing ones and find free bearer id if any */ 266 while (bearer_id < MAX_BEARERS) { 267 b = rtnl_dereference(tn->bearer_list[bearer_id]); 268 if (!b) 269 break; 270 if (!strcmp(name, b->name)) { 271 errstr = "already enabled"; 272 goto rejected; 273 } 274 bearer_id++; 275 if (b->priority != prio) 276 continue; 277 if (++with_this_prio <= 2) 278 continue; 279 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n", 280 name, prio); 281 if (prio == TIPC_MIN_LINK_PRI) { 282 errstr = "cannot adjust to lower"; 283 goto rejected; 284 } 285 pr_warn("Bearer <%s>: trying with adjusted priority\n", name); 286 prio--; 287 bearer_id = 0; 288 with_this_prio = 1; 289 } 290 291 if (bearer_id >= MAX_BEARERS) { 292 errstr = "max 3 bearers permitted"; 293 goto rejected; 294 } 295 296 b = kzalloc(sizeof(*b), GFP_ATOMIC); 297 if (!b) 298 return -ENOMEM; 299 300 strcpy(b->name, name); 301 b->media = m; 302 res = m->enable_media(net, b, attr); 303 if (res) { 304 kfree(b); 305 errstr = "failed to enable media"; 306 goto rejected; 307 } 308 309 b->identity = bearer_id; 310 b->tolerance = m->tolerance; 311 b->window = m->window; 312 b->domain = disc_domain; 313 b->net_plane = bearer_id + 'A'; 314 b->priority = prio; 315 test_and_set_bit_lock(0, &b->up); 316 317 res = tipc_disc_create(net, b, &b->bcast_addr, &skb); 318 if (res) { 319 bearer_disable(net, b); 320 kfree(b); 321 errstr = "failed to create discoverer"; 322 goto rejected; 323 } 324 325 rcu_assign_pointer(tn->bearer_list[bearer_id], b); 326 if (skb) 327 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); 328 329 if (tipc_mon_create(net, bearer_id)) { 330 bearer_disable(net, b); 331 return -ENOMEM; 332 } 333 334 pr_info("Enabled bearer <%s>, priority %u\n", name, prio); 335 336 return res; 337 rejected: 338 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr); 339 return res; 340 } 341 342 /** 343 * tipc_reset_bearer - Reset all links established over this bearer 344 */ 345 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) 346 { 347 pr_info("Resetting bearer <%s>\n", b->name); 348 tipc_node_delete_links(net, b->identity); 349 tipc_disc_reset(net, b); 350 return 0; 351 } 352 353 /** 354 * bearer_disable 355 * 356 * Note: This routine assumes caller holds RTNL lock. 357 */ 358 static void bearer_disable(struct net *net, struct tipc_bearer *b) 359 { 360 struct tipc_net *tn = tipc_net(net); 361 int bearer_id = b->identity; 362 363 pr_info("Disabling bearer <%s>\n", b->name); 364 clear_bit_unlock(0, &b->up); 365 tipc_node_delete_links(net, bearer_id); 366 b->media->disable_media(b); 367 RCU_INIT_POINTER(b->media_ptr, NULL); 368 if (b->disc) 369 tipc_disc_delete(b->disc); 370 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); 371 kfree_rcu(b, rcu); 372 tipc_mon_delete(net, bearer_id); 373 } 374 375 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 376 struct nlattr *attr[]) 377 { 378 char *dev_name = strchr((const char *)b->name, ':') + 1; 379 int hwaddr_len = b->media->hwaddr_len; 380 u8 node_id[NODE_ID_LEN] = {0,}; 381 struct net_device *dev; 382 383 /* Find device with specified name */ 384 dev = dev_get_by_name(net, dev_name); 385 if (!dev) 386 return -ENODEV; 387 if (tipc_mtu_bad(dev, 0)) { 388 dev_put(dev); 389 return -EINVAL; 390 } 391 392 /* Autoconfigure own node identity if needed */ 393 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) { 394 memcpy(node_id, dev->dev_addr, hwaddr_len); 395 tipc_net_init(net, node_id, 0); 396 } 397 if (!tipc_own_id(net)) { 398 dev_put(dev); 399 pr_warn("Failed to obtain node identity\n"); 400 return -EINVAL; 401 } 402 403 /* Associate TIPC bearer with L2 bearer */ 404 rcu_assign_pointer(b->media_ptr, dev); 405 b->pt.dev = dev; 406 b->pt.type = htons(ETH_P_TIPC); 407 b->pt.func = tipc_l2_rcv_msg; 408 dev_add_pack(&b->pt); 409 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 410 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len); 411 b->bcast_addr.media_id = b->media->type_id; 412 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 413 b->mtu = dev->mtu; 414 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 415 rcu_assign_pointer(dev->tipc_ptr, b); 416 return 0; 417 } 418 419 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 420 * 421 * Mark L2 bearer as inactive so that incoming buffers are thrown away 422 */ 423 void tipc_disable_l2_media(struct tipc_bearer *b) 424 { 425 struct net_device *dev; 426 427 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 428 dev_remove_pack(&b->pt); 429 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 430 synchronize_net(); 431 dev_put(dev); 432 } 433 434 /** 435 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 436 * @skb: the packet to be sent 437 * @b: the bearer through which the packet is to be sent 438 * @dest: peer destination address 439 */ 440 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, 441 struct tipc_bearer *b, struct tipc_media_addr *dest) 442 { 443 struct net_device *dev; 444 int delta; 445 446 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 447 if (!dev) 448 return 0; 449 450 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); 451 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) { 452 kfree_skb(skb); 453 return 0; 454 } 455 skb_reset_network_header(skb); 456 skb->dev = dev; 457 skb->protocol = htons(ETH_P_TIPC); 458 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, 459 dev->dev_addr, skb->len); 460 dev_queue_xmit(skb); 461 return 0; 462 } 463 464 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id) 465 { 466 bool supp = false; 467 struct tipc_bearer *b; 468 469 rcu_read_lock(); 470 b = bearer_get(net, bearer_id); 471 if (b) 472 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT); 473 rcu_read_unlock(); 474 return supp; 475 } 476 477 int tipc_bearer_mtu(struct net *net, u32 bearer_id) 478 { 479 int mtu = 0; 480 struct tipc_bearer *b; 481 482 rcu_read_lock(); 483 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]); 484 if (b) 485 mtu = b->mtu; 486 rcu_read_unlock(); 487 return mtu; 488 } 489 490 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer 491 */ 492 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, 493 struct sk_buff *skb, 494 struct tipc_media_addr *dest) 495 { 496 struct tipc_msg *hdr = buf_msg(skb); 497 struct tipc_bearer *b; 498 499 rcu_read_lock(); 500 b = bearer_get(net, bearer_id); 501 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) 502 b->media->send_msg(net, skb, b, dest); 503 else 504 kfree_skb(skb); 505 rcu_read_unlock(); 506 } 507 508 /* tipc_bearer_xmit() -send buffer to destination over bearer 509 */ 510 void tipc_bearer_xmit(struct net *net, u32 bearer_id, 511 struct sk_buff_head *xmitq, 512 struct tipc_media_addr *dst) 513 { 514 struct tipc_bearer *b; 515 struct sk_buff *skb, *tmp; 516 517 if (skb_queue_empty(xmitq)) 518 return; 519 520 rcu_read_lock(); 521 b = bearer_get(net, bearer_id); 522 if (unlikely(!b)) 523 __skb_queue_purge(xmitq); 524 skb_queue_walk_safe(xmitq, skb, tmp) { 525 __skb_dequeue(xmitq); 526 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) 527 b->media->send_msg(net, skb, b, dst); 528 else 529 kfree_skb(skb); 530 } 531 rcu_read_unlock(); 532 } 533 534 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations 535 */ 536 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 537 struct sk_buff_head *xmitq) 538 { 539 struct tipc_net *tn = tipc_net(net); 540 int net_id = tn->net_id; 541 struct tipc_bearer *b; 542 struct sk_buff *skb, *tmp; 543 struct tipc_msg *hdr; 544 545 rcu_read_lock(); 546 b = bearer_get(net, bearer_id); 547 if (unlikely(!b || !test_bit(0, &b->up))) 548 __skb_queue_purge(xmitq); 549 skb_queue_walk_safe(xmitq, skb, tmp) { 550 hdr = buf_msg(skb); 551 msg_set_non_seq(hdr, 1); 552 msg_set_mc_netid(hdr, net_id); 553 __skb_dequeue(xmitq); 554 b->media->send_msg(net, skb, b, &b->bcast_addr); 555 } 556 rcu_read_unlock(); 557 } 558 559 /** 560 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 561 * @buf: the received packet 562 * @dev: the net device that the packet was received on 563 * @pt: the packet_type structure which was used to register this handler 564 * @orig_dev: the original receive net device in case the device is a bond 565 * 566 * Accept only packets explicitly sent to this node, or broadcast packets; 567 * ignores packets sent using interface multicast, and traffic sent to other 568 * nodes (which can happen if interface is running in promiscuous mode). 569 */ 570 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, 571 struct packet_type *pt, struct net_device *orig_dev) 572 { 573 struct tipc_bearer *b; 574 575 rcu_read_lock(); 576 b = rcu_dereference_rtnl(dev->tipc_ptr) ?: 577 rcu_dereference_rtnl(orig_dev->tipc_ptr); 578 if (likely(b && test_bit(0, &b->up) && 579 (skb->pkt_type <= PACKET_MULTICAST))) { 580 skb->next = NULL; 581 tipc_rcv(dev_net(b->pt.dev), skb, b); 582 rcu_read_unlock(); 583 return NET_RX_SUCCESS; 584 } 585 rcu_read_unlock(); 586 kfree_skb(skb); 587 return NET_RX_DROP; 588 } 589 590 /** 591 * tipc_l2_device_event - handle device events from network device 592 * @nb: the context of the notification 593 * @evt: the type of event 594 * @ptr: the net device that the event was on 595 * 596 * This function is called by the Ethernet driver in case of link 597 * change event. 598 */ 599 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 600 void *ptr) 601 { 602 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 603 struct net *net = dev_net(dev); 604 struct tipc_bearer *b; 605 606 b = rtnl_dereference(dev->tipc_ptr); 607 if (!b) 608 return NOTIFY_DONE; 609 610 switch (evt) { 611 case NETDEV_CHANGE: 612 if (netif_carrier_ok(dev)) 613 break; 614 /* else: fall through */ 615 case NETDEV_UP: 616 test_and_set_bit_lock(0, &b->up); 617 break; 618 case NETDEV_GOING_DOWN: 619 clear_bit_unlock(0, &b->up); 620 tipc_reset_bearer(net, b); 621 break; 622 case NETDEV_CHANGEMTU: 623 if (tipc_mtu_bad(dev, 0)) { 624 bearer_disable(net, b); 625 break; 626 } 627 b->mtu = dev->mtu; 628 tipc_reset_bearer(net, b); 629 break; 630 case NETDEV_CHANGEADDR: 631 b->media->raw2addr(b, &b->addr, 632 (char *)dev->dev_addr); 633 tipc_reset_bearer(net, b); 634 break; 635 case NETDEV_UNREGISTER: 636 case NETDEV_CHANGENAME: 637 bearer_disable(net, b); 638 break; 639 } 640 return NOTIFY_OK; 641 } 642 643 static struct notifier_block notifier = { 644 .notifier_call = tipc_l2_device_event, 645 .priority = 0, 646 }; 647 648 int tipc_bearer_setup(void) 649 { 650 return register_netdevice_notifier(¬ifier); 651 } 652 653 void tipc_bearer_cleanup(void) 654 { 655 unregister_netdevice_notifier(¬ifier); 656 } 657 658 void tipc_bearer_stop(struct net *net) 659 { 660 struct tipc_net *tn = net_generic(net, tipc_net_id); 661 struct tipc_bearer *b; 662 u32 i; 663 664 for (i = 0; i < MAX_BEARERS; i++) { 665 b = rtnl_dereference(tn->bearer_list[i]); 666 if (b) { 667 bearer_disable(net, b); 668 tn->bearer_list[i] = NULL; 669 } 670 } 671 } 672 673 /* Caller should hold rtnl_lock to protect the bearer */ 674 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 675 struct tipc_bearer *bearer, int nlflags) 676 { 677 void *hdr; 678 struct nlattr *attrs; 679 struct nlattr *prop; 680 681 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 682 nlflags, TIPC_NL_BEARER_GET); 683 if (!hdr) 684 return -EMSGSIZE; 685 686 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 687 if (!attrs) 688 goto msg_full; 689 690 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 691 goto attr_msg_full; 692 693 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 694 if (!prop) 695 goto prop_msg_full; 696 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 697 goto prop_msg_full; 698 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 699 goto prop_msg_full; 700 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 701 goto prop_msg_full; 702 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) 703 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu)) 704 goto prop_msg_full; 705 706 nla_nest_end(msg->skb, prop); 707 708 #ifdef CONFIG_TIPC_MEDIA_UDP 709 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) { 710 if (tipc_udp_nl_add_bearer_data(msg, bearer)) 711 goto attr_msg_full; 712 } 713 #endif 714 715 nla_nest_end(msg->skb, attrs); 716 genlmsg_end(msg->skb, hdr); 717 718 return 0; 719 720 prop_msg_full: 721 nla_nest_cancel(msg->skb, prop); 722 attr_msg_full: 723 nla_nest_cancel(msg->skb, attrs); 724 msg_full: 725 genlmsg_cancel(msg->skb, hdr); 726 727 return -EMSGSIZE; 728 } 729 730 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 731 { 732 int err; 733 int i = cb->args[0]; 734 struct tipc_bearer *bearer; 735 struct tipc_nl_msg msg; 736 struct net *net = sock_net(skb->sk); 737 struct tipc_net *tn = net_generic(net, tipc_net_id); 738 739 if (i == MAX_BEARERS) 740 return 0; 741 742 msg.skb = skb; 743 msg.portid = NETLINK_CB(cb->skb).portid; 744 msg.seq = cb->nlh->nlmsg_seq; 745 746 rtnl_lock(); 747 for (i = 0; i < MAX_BEARERS; i++) { 748 bearer = rtnl_dereference(tn->bearer_list[i]); 749 if (!bearer) 750 continue; 751 752 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 753 if (err) 754 break; 755 } 756 rtnl_unlock(); 757 758 cb->args[0] = i; 759 return skb->len; 760 } 761 762 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 763 { 764 int err; 765 char *name; 766 struct sk_buff *rep; 767 struct tipc_bearer *bearer; 768 struct tipc_nl_msg msg; 769 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 770 struct net *net = genl_info_net(info); 771 772 if (!info->attrs[TIPC_NLA_BEARER]) 773 return -EINVAL; 774 775 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 776 info->attrs[TIPC_NLA_BEARER], 777 tipc_nl_bearer_policy, info->extack); 778 if (err) 779 return err; 780 781 if (!attrs[TIPC_NLA_BEARER_NAME]) 782 return -EINVAL; 783 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 784 785 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 786 if (!rep) 787 return -ENOMEM; 788 789 msg.skb = rep; 790 msg.portid = info->snd_portid; 791 msg.seq = info->snd_seq; 792 793 rtnl_lock(); 794 bearer = tipc_bearer_find(net, name); 795 if (!bearer) { 796 err = -EINVAL; 797 goto err_out; 798 } 799 800 err = __tipc_nl_add_bearer(&msg, bearer, 0); 801 if (err) 802 goto err_out; 803 rtnl_unlock(); 804 805 return genlmsg_reply(rep, info); 806 err_out: 807 rtnl_unlock(); 808 nlmsg_free(rep); 809 810 return err; 811 } 812 813 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 814 { 815 int err; 816 char *name; 817 struct tipc_bearer *bearer; 818 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 819 struct net *net = sock_net(skb->sk); 820 821 if (!info->attrs[TIPC_NLA_BEARER]) 822 return -EINVAL; 823 824 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 825 info->attrs[TIPC_NLA_BEARER], 826 tipc_nl_bearer_policy, info->extack); 827 if (err) 828 return err; 829 830 if (!attrs[TIPC_NLA_BEARER_NAME]) 831 return -EINVAL; 832 833 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 834 835 bearer = tipc_bearer_find(net, name); 836 if (!bearer) 837 return -EINVAL; 838 839 bearer_disable(net, bearer); 840 841 return 0; 842 } 843 844 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 845 { 846 int err; 847 848 rtnl_lock(); 849 err = __tipc_nl_bearer_disable(skb, info); 850 rtnl_unlock(); 851 852 return err; 853 } 854 855 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 856 { 857 int err; 858 char *bearer; 859 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 860 struct net *net = sock_net(skb->sk); 861 u32 domain = 0; 862 u32 prio; 863 864 prio = TIPC_MEDIA_LINK_PRI; 865 866 if (!info->attrs[TIPC_NLA_BEARER]) 867 return -EINVAL; 868 869 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 870 info->attrs[TIPC_NLA_BEARER], 871 tipc_nl_bearer_policy, info->extack); 872 if (err) 873 return err; 874 875 if (!attrs[TIPC_NLA_BEARER_NAME]) 876 return -EINVAL; 877 878 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 879 880 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 881 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 882 883 if (attrs[TIPC_NLA_BEARER_PROP]) { 884 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 885 886 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 887 props); 888 if (err) 889 return err; 890 891 if (props[TIPC_NLA_PROP_PRIO]) 892 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 893 } 894 895 return tipc_enable_bearer(net, bearer, domain, prio, attrs); 896 } 897 898 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 899 { 900 int err; 901 902 rtnl_lock(); 903 err = __tipc_nl_bearer_enable(skb, info); 904 rtnl_unlock(); 905 906 return err; 907 } 908 909 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info) 910 { 911 int err; 912 char *name; 913 struct tipc_bearer *b; 914 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 915 struct net *net = sock_net(skb->sk); 916 917 if (!info->attrs[TIPC_NLA_BEARER]) 918 return -EINVAL; 919 920 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 921 info->attrs[TIPC_NLA_BEARER], 922 tipc_nl_bearer_policy, info->extack); 923 if (err) 924 return err; 925 926 if (!attrs[TIPC_NLA_BEARER_NAME]) 927 return -EINVAL; 928 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 929 930 rtnl_lock(); 931 b = tipc_bearer_find(net, name); 932 if (!b) { 933 rtnl_unlock(); 934 return -EINVAL; 935 } 936 937 #ifdef CONFIG_TIPC_MEDIA_UDP 938 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) { 939 err = tipc_udp_nl_bearer_add(b, 940 attrs[TIPC_NLA_BEARER_UDP_OPTS]); 941 if (err) { 942 rtnl_unlock(); 943 return err; 944 } 945 } 946 #endif 947 rtnl_unlock(); 948 949 return 0; 950 } 951 952 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 953 { 954 struct tipc_bearer *b; 955 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 956 struct net *net = sock_net(skb->sk); 957 char *name; 958 int err; 959 960 if (!info->attrs[TIPC_NLA_BEARER]) 961 return -EINVAL; 962 963 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 964 info->attrs[TIPC_NLA_BEARER], 965 tipc_nl_bearer_policy, info->extack); 966 if (err) 967 return err; 968 969 if (!attrs[TIPC_NLA_BEARER_NAME]) 970 return -EINVAL; 971 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 972 973 b = tipc_bearer_find(net, name); 974 if (!b) 975 return -EINVAL; 976 977 if (attrs[TIPC_NLA_BEARER_PROP]) { 978 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 979 980 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 981 props); 982 if (err) 983 return err; 984 985 if (props[TIPC_NLA_PROP_TOL]) { 986 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 987 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL); 988 } 989 if (props[TIPC_NLA_PROP_PRIO]) 990 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 991 if (props[TIPC_NLA_PROP_WIN]) 992 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 993 if (props[TIPC_NLA_PROP_MTU]) { 994 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) 995 return -EINVAL; 996 #ifdef CONFIG_TIPC_MEDIA_UDP 997 if (tipc_udp_mtu_bad(nla_get_u32 998 (props[TIPC_NLA_PROP_MTU]))) 999 return -EINVAL; 1000 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); 1001 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU); 1002 #endif 1003 } 1004 } 1005 1006 return 0; 1007 } 1008 1009 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 1010 { 1011 int err; 1012 1013 rtnl_lock(); 1014 err = __tipc_nl_bearer_set(skb, info); 1015 rtnl_unlock(); 1016 1017 return err; 1018 } 1019 1020 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 1021 struct tipc_media *media, int nlflags) 1022 { 1023 void *hdr; 1024 struct nlattr *attrs; 1025 struct nlattr *prop; 1026 1027 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 1028 nlflags, TIPC_NL_MEDIA_GET); 1029 if (!hdr) 1030 return -EMSGSIZE; 1031 1032 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 1033 if (!attrs) 1034 goto msg_full; 1035 1036 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 1037 goto attr_msg_full; 1038 1039 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 1040 if (!prop) 1041 goto prop_msg_full; 1042 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 1043 goto prop_msg_full; 1044 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 1045 goto prop_msg_full; 1046 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 1047 goto prop_msg_full; 1048 if (media->type_id == TIPC_MEDIA_TYPE_UDP) 1049 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu)) 1050 goto prop_msg_full; 1051 1052 nla_nest_end(msg->skb, prop); 1053 nla_nest_end(msg->skb, attrs); 1054 genlmsg_end(msg->skb, hdr); 1055 1056 return 0; 1057 1058 prop_msg_full: 1059 nla_nest_cancel(msg->skb, prop); 1060 attr_msg_full: 1061 nla_nest_cancel(msg->skb, attrs); 1062 msg_full: 1063 genlmsg_cancel(msg->skb, hdr); 1064 1065 return -EMSGSIZE; 1066 } 1067 1068 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 1069 { 1070 int err; 1071 int i = cb->args[0]; 1072 struct tipc_nl_msg msg; 1073 1074 if (i == MAX_MEDIA) 1075 return 0; 1076 1077 msg.skb = skb; 1078 msg.portid = NETLINK_CB(cb->skb).portid; 1079 msg.seq = cb->nlh->nlmsg_seq; 1080 1081 rtnl_lock(); 1082 for (; media_info_array[i] != NULL; i++) { 1083 err = __tipc_nl_add_media(&msg, media_info_array[i], 1084 NLM_F_MULTI); 1085 if (err) 1086 break; 1087 } 1088 rtnl_unlock(); 1089 1090 cb->args[0] = i; 1091 return skb->len; 1092 } 1093 1094 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 1095 { 1096 int err; 1097 char *name; 1098 struct tipc_nl_msg msg; 1099 struct tipc_media *media; 1100 struct sk_buff *rep; 1101 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1102 1103 if (!info->attrs[TIPC_NLA_MEDIA]) 1104 return -EINVAL; 1105 1106 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1107 info->attrs[TIPC_NLA_MEDIA], 1108 tipc_nl_media_policy, info->extack); 1109 if (err) 1110 return err; 1111 1112 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1113 return -EINVAL; 1114 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1115 1116 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1117 if (!rep) 1118 return -ENOMEM; 1119 1120 msg.skb = rep; 1121 msg.portid = info->snd_portid; 1122 msg.seq = info->snd_seq; 1123 1124 rtnl_lock(); 1125 media = tipc_media_find(name); 1126 if (!media) { 1127 err = -EINVAL; 1128 goto err_out; 1129 } 1130 1131 err = __tipc_nl_add_media(&msg, media, 0); 1132 if (err) 1133 goto err_out; 1134 rtnl_unlock(); 1135 1136 return genlmsg_reply(rep, info); 1137 err_out: 1138 rtnl_unlock(); 1139 nlmsg_free(rep); 1140 1141 return err; 1142 } 1143 1144 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1145 { 1146 int err; 1147 char *name; 1148 struct tipc_media *m; 1149 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1150 1151 if (!info->attrs[TIPC_NLA_MEDIA]) 1152 return -EINVAL; 1153 1154 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1155 info->attrs[TIPC_NLA_MEDIA], 1156 tipc_nl_media_policy, info->extack); 1157 1158 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1159 return -EINVAL; 1160 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1161 1162 m = tipc_media_find(name); 1163 if (!m) 1164 return -EINVAL; 1165 1166 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1167 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1168 1169 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1170 props); 1171 if (err) 1172 return err; 1173 1174 if (props[TIPC_NLA_PROP_TOL]) 1175 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1176 if (props[TIPC_NLA_PROP_PRIO]) 1177 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1178 if (props[TIPC_NLA_PROP_WIN]) 1179 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1180 if (props[TIPC_NLA_PROP_MTU]) { 1181 if (m->type_id != TIPC_MEDIA_TYPE_UDP) 1182 return -EINVAL; 1183 #ifdef CONFIG_TIPC_MEDIA_UDP 1184 if (tipc_udp_mtu_bad(nla_get_u32 1185 (props[TIPC_NLA_PROP_MTU]))) 1186 return -EINVAL; 1187 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); 1188 #endif 1189 } 1190 } 1191 1192 return 0; 1193 } 1194 1195 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1196 { 1197 int err; 1198 1199 rtnl_lock(); 1200 err = __tipc_nl_media_set(skb, info); 1201 rtnl_unlock(); 1202 1203 return err; 1204 } 1205