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 69 /** 70 * tipc_media_find - locates specified media object by name 71 */ 72 struct tipc_media *tipc_media_find(const char *name) 73 { 74 u32 i; 75 76 for (i = 0; media_info_array[i] != NULL; i++) { 77 if (!strcmp(media_info_array[i]->name, name)) 78 break; 79 } 80 return media_info_array[i]; 81 } 82 83 /** 84 * media_find_id - locates specified media object by type identifier 85 */ 86 static struct tipc_media *media_find_id(u8 type) 87 { 88 u32 i; 89 90 for (i = 0; media_info_array[i] != NULL; i++) { 91 if (media_info_array[i]->type_id == type) 92 break; 93 } 94 return media_info_array[i]; 95 } 96 97 /** 98 * tipc_media_addr_printf - record media address in print buffer 99 */ 100 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) 101 { 102 char addr_str[MAX_ADDR_STR]; 103 struct tipc_media *m; 104 int ret; 105 106 m = media_find_id(a->media_id); 107 108 if (m && !m->addr2str(a, addr_str, sizeof(addr_str))) 109 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str); 110 else { 111 u32 i; 112 113 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); 114 for (i = 0; i < sizeof(a->value); i++) 115 ret += scnprintf(buf - ret, len + ret, 116 "-%02x", a->value[i]); 117 } 118 } 119 120 /** 121 * bearer_name_validate - validate & (optionally) deconstruct bearer name 122 * @name: ptr to bearer name string 123 * @name_parts: ptr to area for bearer name components (or NULL if not needed) 124 * 125 * Returns 1 if bearer name is valid, otherwise 0. 126 */ 127 static int bearer_name_validate(const char *name, 128 struct tipc_bearer_names *name_parts) 129 { 130 char name_copy[TIPC_MAX_BEARER_NAME]; 131 char *media_name; 132 char *if_name; 133 u32 media_len; 134 u32 if_len; 135 136 /* copy bearer name & ensure length is OK */ 137 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; 138 /* need above in case non-Posix strncpy() doesn't pad with nulls */ 139 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); 140 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) 141 return 0; 142 143 /* ensure all component parts of bearer name are present */ 144 media_name = name_copy; 145 if_name = strchr(media_name, ':'); 146 if (if_name == NULL) 147 return 0; 148 *(if_name++) = 0; 149 media_len = if_name - media_name; 150 if_len = strlen(if_name) + 1; 151 152 /* validate component parts of bearer name */ 153 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || 154 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) 155 return 0; 156 157 /* return bearer name components, if necessary */ 158 if (name_parts) { 159 strcpy(name_parts->media_name, media_name); 160 strcpy(name_parts->if_name, if_name); 161 } 162 return 1; 163 } 164 165 /** 166 * tipc_bearer_find - locates bearer object with matching bearer name 167 */ 168 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) 169 { 170 struct tipc_net *tn = net_generic(net, tipc_net_id); 171 struct tipc_bearer *b; 172 u32 i; 173 174 for (i = 0; i < MAX_BEARERS; i++) { 175 b = rtnl_dereference(tn->bearer_list[i]); 176 if (b && (!strcmp(b->name, name))) 177 return b; 178 } 179 return NULL; 180 } 181 182 /* tipc_bearer_get_name - get the bearer name from its id. 183 * @net: network namespace 184 * @name: a pointer to the buffer where the name will be stored. 185 * @bearer_id: the id to get the name from. 186 */ 187 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id) 188 { 189 struct tipc_net *tn = tipc_net(net); 190 struct tipc_bearer *b; 191 192 if (bearer_id >= MAX_BEARERS) 193 return -EINVAL; 194 195 b = rtnl_dereference(tn->bearer_list[bearer_id]); 196 if (!b) 197 return -EINVAL; 198 199 strcpy(name, b->name); 200 return 0; 201 } 202 203 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) 204 { 205 struct tipc_net *tn = net_generic(net, tipc_net_id); 206 struct tipc_bearer *b; 207 208 rcu_read_lock(); 209 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 210 if (b) 211 tipc_disc_add_dest(b->link_req); 212 rcu_read_unlock(); 213 } 214 215 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) 216 { 217 struct tipc_net *tn = net_generic(net, tipc_net_id); 218 struct tipc_bearer *b; 219 220 rcu_read_lock(); 221 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 222 if (b) 223 tipc_disc_remove_dest(b->link_req); 224 rcu_read_unlock(); 225 } 226 227 /** 228 * tipc_enable_bearer - enable bearer with the given name 229 */ 230 static int tipc_enable_bearer(struct net *net, const char *name, 231 u32 disc_domain, u32 priority, 232 struct nlattr *attr[]) 233 { 234 struct tipc_net *tn = net_generic(net, tipc_net_id); 235 struct tipc_bearer *b; 236 struct tipc_media *m; 237 struct tipc_bearer_names b_names; 238 struct sk_buff *skb; 239 char addr_string[16]; 240 u32 bearer_id; 241 u32 with_this_prio; 242 u32 i; 243 int res = -EINVAL; 244 245 if (!tn->own_addr) { 246 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", 247 name); 248 return -ENOPROTOOPT; 249 } 250 if (!bearer_name_validate(name, &b_names)) { 251 pr_warn("Bearer <%s> rejected, illegal name\n", name); 252 return -EINVAL; 253 } 254 if (tipc_addr_domain_valid(disc_domain) && 255 (disc_domain != tn->own_addr)) { 256 if (tipc_in_scope(disc_domain, tn->own_addr)) { 257 disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK; 258 res = 0; /* accept any node in own cluster */ 259 } else if (in_own_cluster_exact(net, disc_domain)) 260 res = 0; /* accept specified node in own cluster */ 261 } 262 if (res) { 263 pr_warn("Bearer <%s> rejected, illegal discovery domain\n", 264 name); 265 return -EINVAL; 266 } 267 if ((priority > TIPC_MAX_LINK_PRI) && 268 (priority != TIPC_MEDIA_LINK_PRI)) { 269 pr_warn("Bearer <%s> rejected, illegal priority\n", name); 270 return -EINVAL; 271 } 272 273 m = tipc_media_find(b_names.media_name); 274 if (!m) { 275 pr_warn("Bearer <%s> rejected, media <%s> not registered\n", 276 name, b_names.media_name); 277 return -EINVAL; 278 } 279 280 if (priority == TIPC_MEDIA_LINK_PRI) 281 priority = m->priority; 282 283 restart: 284 bearer_id = MAX_BEARERS; 285 with_this_prio = 1; 286 for (i = MAX_BEARERS; 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 pr_warn("Bearer <%s> rejected, already enabled\n", 294 name); 295 return -EINVAL; 296 } 297 if ((b->priority == priority) && 298 (++with_this_prio > 2)) { 299 if (priority-- == 0) { 300 pr_warn("Bearer <%s> rejected, duplicate priority\n", 301 name); 302 return -EINVAL; 303 } 304 pr_warn("Bearer <%s> priority adjustment required %u->%u\n", 305 name, priority + 1, priority); 306 goto restart; 307 } 308 } 309 if (bearer_id >= MAX_BEARERS) { 310 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", 311 name, MAX_BEARERS); 312 return -EINVAL; 313 } 314 315 b = kzalloc(sizeof(*b), GFP_ATOMIC); 316 if (!b) 317 return -ENOMEM; 318 319 strcpy(b->name, name); 320 b->media = m; 321 res = m->enable_media(net, b, attr); 322 if (res) { 323 pr_warn("Bearer <%s> rejected, enable failure (%d)\n", 324 name, -res); 325 return -EINVAL; 326 } 327 328 b->identity = bearer_id; 329 b->tolerance = m->tolerance; 330 b->window = m->window; 331 b->domain = disc_domain; 332 b->net_plane = bearer_id + 'A'; 333 b->priority = priority; 334 test_and_set_bit_lock(0, &b->up); 335 336 res = tipc_disc_create(net, b, &b->bcast_addr, &skb); 337 if (res) { 338 bearer_disable(net, b); 339 pr_warn("Bearer <%s> rejected, discovery object creation failed\n", 340 name); 341 return -EINVAL; 342 } 343 344 rcu_assign_pointer(tn->bearer_list[bearer_id], b); 345 if (skb) 346 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); 347 348 if (tipc_mon_create(net, bearer_id)) 349 return -ENOMEM; 350 351 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", 352 name, 353 tipc_addr_string_fill(addr_string, disc_domain), priority); 354 return res; 355 } 356 357 /** 358 * tipc_reset_bearer - Reset all links established over this bearer 359 */ 360 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) 361 { 362 pr_info("Resetting bearer <%s>\n", b->name); 363 tipc_node_delete_links(net, b->identity); 364 tipc_disc_reset(net, b); 365 return 0; 366 } 367 368 /* tipc_bearer_reset_all - reset all links on all bearers 369 */ 370 void tipc_bearer_reset_all(struct net *net) 371 { 372 struct tipc_bearer *b; 373 int i; 374 375 for (i = 0; i < MAX_BEARERS; i++) { 376 b = bearer_get(net, i); 377 if (b) 378 clear_bit_unlock(0, &b->up); 379 } 380 for (i = 0; i < MAX_BEARERS; i++) { 381 b = bearer_get(net, i); 382 if (b) 383 tipc_reset_bearer(net, b); 384 } 385 for (i = 0; i < MAX_BEARERS; i++) { 386 b = bearer_get(net, i); 387 if (b) 388 test_and_set_bit_lock(0, &b->up); 389 } 390 } 391 392 /** 393 * bearer_disable 394 * 395 * Note: This routine assumes caller holds RTNL lock. 396 */ 397 static void bearer_disable(struct net *net, struct tipc_bearer *b) 398 { 399 struct tipc_net *tn = tipc_net(net); 400 int bearer_id = b->identity; 401 402 pr_info("Disabling bearer <%s>\n", b->name); 403 clear_bit_unlock(0, &b->up); 404 tipc_node_delete_links(net, bearer_id); 405 b->media->disable_media(b); 406 RCU_INIT_POINTER(b->media_ptr, NULL); 407 if (b->link_req) 408 tipc_disc_delete(b->link_req); 409 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); 410 kfree_rcu(b, rcu); 411 tipc_mon_delete(net, bearer_id); 412 } 413 414 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 415 struct nlattr *attr[]) 416 { 417 struct net_device *dev; 418 char *driver_name = strchr((const char *)b->name, ':') + 1; 419 420 /* Find device with specified name */ 421 dev = dev_get_by_name(net, driver_name); 422 if (!dev) 423 return -ENODEV; 424 if (tipc_mtu_bad(dev, 0)) { 425 dev_put(dev); 426 return -EINVAL; 427 } 428 429 /* Associate TIPC bearer with L2 bearer */ 430 rcu_assign_pointer(b->media_ptr, dev); 431 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 432 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); 433 b->bcast_addr.media_id = b->media->type_id; 434 b->bcast_addr.broadcast = 1; 435 b->mtu = dev->mtu; 436 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 437 rcu_assign_pointer(dev->tipc_ptr, b); 438 return 0; 439 } 440 441 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 442 * 443 * Mark L2 bearer as inactive so that incoming buffers are thrown away 444 */ 445 void tipc_disable_l2_media(struct tipc_bearer *b) 446 { 447 struct net_device *dev; 448 449 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 450 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 451 synchronize_net(); 452 dev_put(dev); 453 } 454 455 /** 456 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 457 * @skb: the packet to be sent 458 * @b: the bearer through which the packet is to be sent 459 * @dest: peer destination address 460 */ 461 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, 462 struct tipc_bearer *b, struct tipc_media_addr *dest) 463 { 464 struct net_device *dev; 465 int delta; 466 467 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 468 if (!dev) 469 return 0; 470 471 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); 472 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) { 473 kfree_skb(skb); 474 return 0; 475 } 476 skb_reset_network_header(skb); 477 skb->dev = dev; 478 skb->protocol = htons(ETH_P_TIPC); 479 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, 480 dev->dev_addr, skb->len); 481 dev_queue_xmit(skb); 482 return 0; 483 } 484 485 int tipc_bearer_mtu(struct net *net, u32 bearer_id) 486 { 487 int mtu = 0; 488 struct tipc_bearer *b; 489 490 rcu_read_lock(); 491 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]); 492 if (b) 493 mtu = b->mtu; 494 rcu_read_unlock(); 495 return mtu; 496 } 497 498 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer 499 */ 500 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, 501 struct sk_buff *skb, 502 struct tipc_media_addr *dest) 503 { 504 struct tipc_msg *hdr = buf_msg(skb); 505 struct tipc_bearer *b; 506 507 rcu_read_lock(); 508 b = bearer_get(net, bearer_id); 509 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) 510 b->media->send_msg(net, skb, b, dest); 511 else 512 kfree_skb(skb); 513 rcu_read_unlock(); 514 } 515 516 /* tipc_bearer_xmit() -send buffer to destination over bearer 517 */ 518 void tipc_bearer_xmit(struct net *net, u32 bearer_id, 519 struct sk_buff_head *xmitq, 520 struct tipc_media_addr *dst) 521 { 522 struct tipc_bearer *b; 523 struct sk_buff *skb, *tmp; 524 525 if (skb_queue_empty(xmitq)) 526 return; 527 528 rcu_read_lock(); 529 b = bearer_get(net, bearer_id); 530 if (unlikely(!b)) 531 __skb_queue_purge(xmitq); 532 skb_queue_walk_safe(xmitq, skb, tmp) { 533 __skb_dequeue(xmitq); 534 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) 535 b->media->send_msg(net, skb, b, dst); 536 else 537 kfree_skb(skb); 538 } 539 rcu_read_unlock(); 540 } 541 542 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations 543 */ 544 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 545 struct sk_buff_head *xmitq) 546 { 547 struct tipc_net *tn = tipc_net(net); 548 int net_id = tn->net_id; 549 struct tipc_bearer *b; 550 struct sk_buff *skb, *tmp; 551 struct tipc_msg *hdr; 552 553 rcu_read_lock(); 554 b = bearer_get(net, bearer_id); 555 if (unlikely(!b || !test_bit(0, &b->up))) 556 __skb_queue_purge(xmitq); 557 skb_queue_walk_safe(xmitq, skb, tmp) { 558 hdr = buf_msg(skb); 559 msg_set_non_seq(hdr, 1); 560 msg_set_mc_netid(hdr, net_id); 561 __skb_dequeue(xmitq); 562 b->media->send_msg(net, skb, b, &b->bcast_addr); 563 } 564 rcu_read_unlock(); 565 } 566 567 /** 568 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 569 * @buf: the received packet 570 * @dev: the net device that the packet was received on 571 * @pt: the packet_type structure which was used to register this handler 572 * @orig_dev: the original receive net device in case the device is a bond 573 * 574 * Accept only packets explicitly sent to this node, or broadcast packets; 575 * ignores packets sent using interface multicast, and traffic sent to other 576 * nodes (which can happen if interface is running in promiscuous mode). 577 */ 578 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, 579 struct packet_type *pt, struct net_device *orig_dev) 580 { 581 struct tipc_bearer *b; 582 583 rcu_read_lock(); 584 b = rcu_dereference_rtnl(dev->tipc_ptr); 585 if (likely(b && test_bit(0, &b->up) && 586 (skb->pkt_type <= PACKET_BROADCAST))) { 587 skb->next = NULL; 588 tipc_rcv(dev_net(dev), skb, b); 589 rcu_read_unlock(); 590 return NET_RX_SUCCESS; 591 } 592 rcu_read_unlock(); 593 kfree_skb(skb); 594 return NET_RX_DROP; 595 } 596 597 /** 598 * tipc_l2_device_event - handle device events from network device 599 * @nb: the context of the notification 600 * @evt: the type of event 601 * @ptr: the net device that the event was on 602 * 603 * This function is called by the Ethernet driver in case of link 604 * change event. 605 */ 606 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 607 void *ptr) 608 { 609 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 610 struct net *net = dev_net(dev); 611 struct tipc_bearer *b; 612 613 b = rtnl_dereference(dev->tipc_ptr); 614 if (!b) 615 return NOTIFY_DONE; 616 617 switch (evt) { 618 case NETDEV_CHANGE: 619 if (netif_carrier_ok(dev)) 620 break; 621 case NETDEV_UP: 622 test_and_set_bit_lock(0, &b->up); 623 break; 624 case NETDEV_GOING_DOWN: 625 clear_bit_unlock(0, &b->up); 626 tipc_reset_bearer(net, b); 627 break; 628 case NETDEV_CHANGEMTU: 629 if (tipc_mtu_bad(dev, 0)) { 630 bearer_disable(net, b); 631 break; 632 } 633 b->mtu = dev->mtu; 634 tipc_reset_bearer(net, b); 635 break; 636 case NETDEV_CHANGEADDR: 637 b->media->raw2addr(b, &b->addr, 638 (char *)dev->dev_addr); 639 tipc_reset_bearer(net, b); 640 break; 641 case NETDEV_UNREGISTER: 642 case NETDEV_CHANGENAME: 643 bearer_disable(dev_net(dev), b); 644 break; 645 } 646 return NOTIFY_OK; 647 } 648 649 static struct packet_type tipc_packet_type __read_mostly = { 650 .type = htons(ETH_P_TIPC), 651 .func = tipc_l2_rcv_msg, 652 }; 653 654 static struct notifier_block notifier = { 655 .notifier_call = tipc_l2_device_event, 656 .priority = 0, 657 }; 658 659 int tipc_bearer_setup(void) 660 { 661 int err; 662 663 err = register_netdevice_notifier(¬ifier); 664 if (err) 665 return err; 666 dev_add_pack(&tipc_packet_type); 667 return 0; 668 } 669 670 void tipc_bearer_cleanup(void) 671 { 672 unregister_netdevice_notifier(¬ifier); 673 dev_remove_pack(&tipc_packet_type); 674 } 675 676 void tipc_bearer_stop(struct net *net) 677 { 678 struct tipc_net *tn = net_generic(net, tipc_net_id); 679 struct tipc_bearer *b; 680 u32 i; 681 682 for (i = 0; i < MAX_BEARERS; i++) { 683 b = rtnl_dereference(tn->bearer_list[i]); 684 if (b) { 685 bearer_disable(net, b); 686 tn->bearer_list[i] = NULL; 687 } 688 } 689 } 690 691 /* Caller should hold rtnl_lock to protect the bearer */ 692 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 693 struct tipc_bearer *bearer, int nlflags) 694 { 695 void *hdr; 696 struct nlattr *attrs; 697 struct nlattr *prop; 698 699 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 700 nlflags, TIPC_NL_BEARER_GET); 701 if (!hdr) 702 return -EMSGSIZE; 703 704 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 705 if (!attrs) 706 goto msg_full; 707 708 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 709 goto attr_msg_full; 710 711 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 712 if (!prop) 713 goto prop_msg_full; 714 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 715 goto prop_msg_full; 716 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 717 goto prop_msg_full; 718 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 719 goto prop_msg_full; 720 721 nla_nest_end(msg->skb, prop); 722 723 #ifdef CONFIG_TIPC_MEDIA_UDP 724 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) { 725 if (tipc_udp_nl_add_bearer_data(msg, bearer)) 726 goto attr_msg_full; 727 } 728 #endif 729 730 nla_nest_end(msg->skb, attrs); 731 genlmsg_end(msg->skb, hdr); 732 733 return 0; 734 735 prop_msg_full: 736 nla_nest_cancel(msg->skb, prop); 737 attr_msg_full: 738 nla_nest_cancel(msg->skb, attrs); 739 msg_full: 740 genlmsg_cancel(msg->skb, hdr); 741 742 return -EMSGSIZE; 743 } 744 745 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 746 { 747 int err; 748 int i = cb->args[0]; 749 struct tipc_bearer *bearer; 750 struct tipc_nl_msg msg; 751 struct net *net = sock_net(skb->sk); 752 struct tipc_net *tn = net_generic(net, tipc_net_id); 753 754 if (i == MAX_BEARERS) 755 return 0; 756 757 msg.skb = skb; 758 msg.portid = NETLINK_CB(cb->skb).portid; 759 msg.seq = cb->nlh->nlmsg_seq; 760 761 rtnl_lock(); 762 for (i = 0; i < MAX_BEARERS; i++) { 763 bearer = rtnl_dereference(tn->bearer_list[i]); 764 if (!bearer) 765 continue; 766 767 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 768 if (err) 769 break; 770 } 771 rtnl_unlock(); 772 773 cb->args[0] = i; 774 return skb->len; 775 } 776 777 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 778 { 779 int err; 780 char *name; 781 struct sk_buff *rep; 782 struct tipc_bearer *bearer; 783 struct tipc_nl_msg msg; 784 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 785 struct net *net = genl_info_net(info); 786 787 if (!info->attrs[TIPC_NLA_BEARER]) 788 return -EINVAL; 789 790 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 791 info->attrs[TIPC_NLA_BEARER], 792 tipc_nl_bearer_policy); 793 if (err) 794 return err; 795 796 if (!attrs[TIPC_NLA_BEARER_NAME]) 797 return -EINVAL; 798 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 799 800 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 801 if (!rep) 802 return -ENOMEM; 803 804 msg.skb = rep; 805 msg.portid = info->snd_portid; 806 msg.seq = info->snd_seq; 807 808 rtnl_lock(); 809 bearer = tipc_bearer_find(net, name); 810 if (!bearer) { 811 err = -EINVAL; 812 goto err_out; 813 } 814 815 err = __tipc_nl_add_bearer(&msg, bearer, 0); 816 if (err) 817 goto err_out; 818 rtnl_unlock(); 819 820 return genlmsg_reply(rep, info); 821 err_out: 822 rtnl_unlock(); 823 nlmsg_free(rep); 824 825 return err; 826 } 827 828 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 829 { 830 int err; 831 char *name; 832 struct tipc_bearer *bearer; 833 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 834 struct net *net = sock_net(skb->sk); 835 836 if (!info->attrs[TIPC_NLA_BEARER]) 837 return -EINVAL; 838 839 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 840 info->attrs[TIPC_NLA_BEARER], 841 tipc_nl_bearer_policy); 842 if (err) 843 return err; 844 845 if (!attrs[TIPC_NLA_BEARER_NAME]) 846 return -EINVAL; 847 848 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 849 850 rtnl_lock(); 851 bearer = tipc_bearer_find(net, name); 852 if (!bearer) { 853 rtnl_unlock(); 854 return -EINVAL; 855 } 856 857 bearer_disable(net, bearer); 858 rtnl_unlock(); 859 860 return 0; 861 } 862 863 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 864 { 865 int err; 866 char *bearer; 867 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 868 struct net *net = sock_net(skb->sk); 869 struct tipc_net *tn = net_generic(net, tipc_net_id); 870 u32 domain; 871 u32 prio; 872 873 prio = TIPC_MEDIA_LINK_PRI; 874 domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK; 875 876 if (!info->attrs[TIPC_NLA_BEARER]) 877 return -EINVAL; 878 879 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 880 info->attrs[TIPC_NLA_BEARER], 881 tipc_nl_bearer_policy); 882 if (err) 883 return err; 884 885 if (!attrs[TIPC_NLA_BEARER_NAME]) 886 return -EINVAL; 887 888 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 889 890 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 891 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 892 893 if (attrs[TIPC_NLA_BEARER_PROP]) { 894 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 895 896 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 897 props); 898 if (err) 899 return err; 900 901 if (props[TIPC_NLA_PROP_PRIO]) 902 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 903 } 904 905 rtnl_lock(); 906 err = tipc_enable_bearer(net, bearer, domain, prio, attrs); 907 if (err) { 908 rtnl_unlock(); 909 return err; 910 } 911 rtnl_unlock(); 912 913 return 0; 914 } 915 916 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info) 917 { 918 int err; 919 char *name; 920 struct tipc_bearer *b; 921 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 922 struct net *net = sock_net(skb->sk); 923 924 if (!info->attrs[TIPC_NLA_BEARER]) 925 return -EINVAL; 926 927 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 928 info->attrs[TIPC_NLA_BEARER], 929 tipc_nl_bearer_policy); 930 if (err) 931 return err; 932 933 if (!attrs[TIPC_NLA_BEARER_NAME]) 934 return -EINVAL; 935 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 936 937 rtnl_lock(); 938 b = tipc_bearer_find(net, name); 939 if (!b) { 940 rtnl_unlock(); 941 return -EINVAL; 942 } 943 944 #ifdef CONFIG_TIPC_MEDIA_UDP 945 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) { 946 err = tipc_udp_nl_bearer_add(b, 947 attrs[TIPC_NLA_BEARER_UDP_OPTS]); 948 if (err) { 949 rtnl_unlock(); 950 return err; 951 } 952 } 953 #endif 954 rtnl_unlock(); 955 956 return 0; 957 } 958 959 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 960 { 961 int err; 962 char *name; 963 struct tipc_bearer *b; 964 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 965 struct net *net = sock_net(skb->sk); 966 967 if (!info->attrs[TIPC_NLA_BEARER]) 968 return -EINVAL; 969 970 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 971 info->attrs[TIPC_NLA_BEARER], 972 tipc_nl_bearer_policy); 973 if (err) 974 return err; 975 976 if (!attrs[TIPC_NLA_BEARER_NAME]) 977 return -EINVAL; 978 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 979 980 rtnl_lock(); 981 b = tipc_bearer_find(net, name); 982 if (!b) { 983 rtnl_unlock(); 984 return -EINVAL; 985 } 986 987 if (attrs[TIPC_NLA_BEARER_PROP]) { 988 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 989 990 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 991 props); 992 if (err) { 993 rtnl_unlock(); 994 return err; 995 } 996 997 if (props[TIPC_NLA_PROP_TOL]) 998 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 999 if (props[TIPC_NLA_PROP_PRIO]) 1000 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1001 if (props[TIPC_NLA_PROP_WIN]) 1002 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1003 } 1004 rtnl_unlock(); 1005 1006 return 0; 1007 } 1008 1009 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 1010 struct tipc_media *media, int nlflags) 1011 { 1012 void *hdr; 1013 struct nlattr *attrs; 1014 struct nlattr *prop; 1015 1016 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 1017 nlflags, TIPC_NL_MEDIA_GET); 1018 if (!hdr) 1019 return -EMSGSIZE; 1020 1021 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 1022 if (!attrs) 1023 goto msg_full; 1024 1025 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 1026 goto attr_msg_full; 1027 1028 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 1029 if (!prop) 1030 goto prop_msg_full; 1031 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 1032 goto prop_msg_full; 1033 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 1034 goto prop_msg_full; 1035 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 1036 goto prop_msg_full; 1037 1038 nla_nest_end(msg->skb, prop); 1039 nla_nest_end(msg->skb, attrs); 1040 genlmsg_end(msg->skb, hdr); 1041 1042 return 0; 1043 1044 prop_msg_full: 1045 nla_nest_cancel(msg->skb, prop); 1046 attr_msg_full: 1047 nla_nest_cancel(msg->skb, attrs); 1048 msg_full: 1049 genlmsg_cancel(msg->skb, hdr); 1050 1051 return -EMSGSIZE; 1052 } 1053 1054 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 1055 { 1056 int err; 1057 int i = cb->args[0]; 1058 struct tipc_nl_msg msg; 1059 1060 if (i == MAX_MEDIA) 1061 return 0; 1062 1063 msg.skb = skb; 1064 msg.portid = NETLINK_CB(cb->skb).portid; 1065 msg.seq = cb->nlh->nlmsg_seq; 1066 1067 rtnl_lock(); 1068 for (; media_info_array[i] != NULL; i++) { 1069 err = __tipc_nl_add_media(&msg, media_info_array[i], 1070 NLM_F_MULTI); 1071 if (err) 1072 break; 1073 } 1074 rtnl_unlock(); 1075 1076 cb->args[0] = i; 1077 return skb->len; 1078 } 1079 1080 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 1081 { 1082 int err; 1083 char *name; 1084 struct tipc_nl_msg msg; 1085 struct tipc_media *media; 1086 struct sk_buff *rep; 1087 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1088 1089 if (!info->attrs[TIPC_NLA_MEDIA]) 1090 return -EINVAL; 1091 1092 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1093 info->attrs[TIPC_NLA_MEDIA], 1094 tipc_nl_media_policy); 1095 if (err) 1096 return err; 1097 1098 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1099 return -EINVAL; 1100 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1101 1102 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1103 if (!rep) 1104 return -ENOMEM; 1105 1106 msg.skb = rep; 1107 msg.portid = info->snd_portid; 1108 msg.seq = info->snd_seq; 1109 1110 rtnl_lock(); 1111 media = tipc_media_find(name); 1112 if (!media) { 1113 err = -EINVAL; 1114 goto err_out; 1115 } 1116 1117 err = __tipc_nl_add_media(&msg, media, 0); 1118 if (err) 1119 goto err_out; 1120 rtnl_unlock(); 1121 1122 return genlmsg_reply(rep, info); 1123 err_out: 1124 rtnl_unlock(); 1125 nlmsg_free(rep); 1126 1127 return err; 1128 } 1129 1130 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1131 { 1132 int err; 1133 char *name; 1134 struct tipc_media *m; 1135 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1136 1137 if (!info->attrs[TIPC_NLA_MEDIA]) 1138 return -EINVAL; 1139 1140 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1141 info->attrs[TIPC_NLA_MEDIA], 1142 tipc_nl_media_policy); 1143 1144 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1145 return -EINVAL; 1146 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1147 1148 rtnl_lock(); 1149 m = tipc_media_find(name); 1150 if (!m) { 1151 rtnl_unlock(); 1152 return -EINVAL; 1153 } 1154 1155 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1156 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1157 1158 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1159 props); 1160 if (err) { 1161 rtnl_unlock(); 1162 return err; 1163 } 1164 1165 if (props[TIPC_NLA_PROP_TOL]) 1166 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1167 if (props[TIPC_NLA_PROP_PRIO]) 1168 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1169 if (props[TIPC_NLA_PROP_WIN]) 1170 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1171 } 1172 rtnl_unlock(); 1173 1174 return 0; 1175 } 1176