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 pr_warn("Failed to obtain node identity\n"); 399 return -EINVAL; 400 } 401 402 /* Associate TIPC bearer with L2 bearer */ 403 rcu_assign_pointer(b->media_ptr, dev); 404 b->pt.dev = dev; 405 b->pt.type = htons(ETH_P_TIPC); 406 b->pt.func = tipc_l2_rcv_msg; 407 dev_add_pack(&b->pt); 408 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 409 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len); 410 b->bcast_addr.media_id = b->media->type_id; 411 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 412 b->mtu = dev->mtu; 413 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 414 rcu_assign_pointer(dev->tipc_ptr, b); 415 return 0; 416 } 417 418 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 419 * 420 * Mark L2 bearer as inactive so that incoming buffers are thrown away 421 */ 422 void tipc_disable_l2_media(struct tipc_bearer *b) 423 { 424 struct net_device *dev; 425 426 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 427 dev_remove_pack(&b->pt); 428 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 429 synchronize_net(); 430 dev_put(dev); 431 } 432 433 /** 434 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 435 * @skb: the packet to be sent 436 * @b: the bearer through which the packet is to be sent 437 * @dest: peer destination address 438 */ 439 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, 440 struct tipc_bearer *b, struct tipc_media_addr *dest) 441 { 442 struct net_device *dev; 443 int delta; 444 445 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 446 if (!dev) 447 return 0; 448 449 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); 450 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) { 451 kfree_skb(skb); 452 return 0; 453 } 454 skb_reset_network_header(skb); 455 skb->dev = dev; 456 skb->protocol = htons(ETH_P_TIPC); 457 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, 458 dev->dev_addr, skb->len); 459 dev_queue_xmit(skb); 460 return 0; 461 } 462 463 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id) 464 { 465 bool supp = false; 466 struct tipc_bearer *b; 467 468 rcu_read_lock(); 469 b = bearer_get(net, bearer_id); 470 if (b) 471 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT); 472 rcu_read_unlock(); 473 return supp; 474 } 475 476 int tipc_bearer_mtu(struct net *net, u32 bearer_id) 477 { 478 int mtu = 0; 479 struct tipc_bearer *b; 480 481 rcu_read_lock(); 482 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]); 483 if (b) 484 mtu = b->mtu; 485 rcu_read_unlock(); 486 return mtu; 487 } 488 489 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer 490 */ 491 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, 492 struct sk_buff *skb, 493 struct tipc_media_addr *dest) 494 { 495 struct tipc_msg *hdr = buf_msg(skb); 496 struct tipc_bearer *b; 497 498 rcu_read_lock(); 499 b = bearer_get(net, bearer_id); 500 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) 501 b->media->send_msg(net, skb, b, dest); 502 else 503 kfree_skb(skb); 504 rcu_read_unlock(); 505 } 506 507 /* tipc_bearer_xmit() -send buffer to destination over bearer 508 */ 509 void tipc_bearer_xmit(struct net *net, u32 bearer_id, 510 struct sk_buff_head *xmitq, 511 struct tipc_media_addr *dst) 512 { 513 struct tipc_bearer *b; 514 struct sk_buff *skb, *tmp; 515 516 if (skb_queue_empty(xmitq)) 517 return; 518 519 rcu_read_lock(); 520 b = bearer_get(net, bearer_id); 521 if (unlikely(!b)) 522 __skb_queue_purge(xmitq); 523 skb_queue_walk_safe(xmitq, skb, tmp) { 524 __skb_dequeue(xmitq); 525 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) 526 b->media->send_msg(net, skb, b, dst); 527 else 528 kfree_skb(skb); 529 } 530 rcu_read_unlock(); 531 } 532 533 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations 534 */ 535 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 536 struct sk_buff_head *xmitq) 537 { 538 struct tipc_net *tn = tipc_net(net); 539 int net_id = tn->net_id; 540 struct tipc_bearer *b; 541 struct sk_buff *skb, *tmp; 542 struct tipc_msg *hdr; 543 544 rcu_read_lock(); 545 b = bearer_get(net, bearer_id); 546 if (unlikely(!b || !test_bit(0, &b->up))) 547 __skb_queue_purge(xmitq); 548 skb_queue_walk_safe(xmitq, skb, tmp) { 549 hdr = buf_msg(skb); 550 msg_set_non_seq(hdr, 1); 551 msg_set_mc_netid(hdr, net_id); 552 __skb_dequeue(xmitq); 553 b->media->send_msg(net, skb, b, &b->bcast_addr); 554 } 555 rcu_read_unlock(); 556 } 557 558 /** 559 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 560 * @buf: the received packet 561 * @dev: the net device that the packet was received on 562 * @pt: the packet_type structure which was used to register this handler 563 * @orig_dev: the original receive net device in case the device is a bond 564 * 565 * Accept only packets explicitly sent to this node, or broadcast packets; 566 * ignores packets sent using interface multicast, and traffic sent to other 567 * nodes (which can happen if interface is running in promiscuous mode). 568 */ 569 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, 570 struct packet_type *pt, struct net_device *orig_dev) 571 { 572 struct tipc_bearer *b; 573 574 rcu_read_lock(); 575 b = rcu_dereference_rtnl(dev->tipc_ptr) ?: 576 rcu_dereference_rtnl(orig_dev->tipc_ptr); 577 if (likely(b && test_bit(0, &b->up) && 578 (skb->pkt_type <= PACKET_MULTICAST))) { 579 skb->next = NULL; 580 tipc_rcv(dev_net(b->pt.dev), skb, b); 581 rcu_read_unlock(); 582 return NET_RX_SUCCESS; 583 } 584 rcu_read_unlock(); 585 kfree_skb(skb); 586 return NET_RX_DROP; 587 } 588 589 /** 590 * tipc_l2_device_event - handle device events from network device 591 * @nb: the context of the notification 592 * @evt: the type of event 593 * @ptr: the net device that the event was on 594 * 595 * This function is called by the Ethernet driver in case of link 596 * change event. 597 */ 598 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 599 void *ptr) 600 { 601 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 602 struct net *net = dev_net(dev); 603 struct tipc_bearer *b; 604 605 b = rtnl_dereference(dev->tipc_ptr); 606 if (!b) 607 return NOTIFY_DONE; 608 609 switch (evt) { 610 case NETDEV_CHANGE: 611 if (netif_carrier_ok(dev)) 612 break; 613 case NETDEV_UP: 614 test_and_set_bit_lock(0, &b->up); 615 break; 616 case NETDEV_GOING_DOWN: 617 clear_bit_unlock(0, &b->up); 618 tipc_reset_bearer(net, b); 619 break; 620 case NETDEV_CHANGEMTU: 621 if (tipc_mtu_bad(dev, 0)) { 622 bearer_disable(net, b); 623 break; 624 } 625 b->mtu = dev->mtu; 626 tipc_reset_bearer(net, b); 627 break; 628 case NETDEV_CHANGEADDR: 629 b->media->raw2addr(b, &b->addr, 630 (char *)dev->dev_addr); 631 tipc_reset_bearer(net, b); 632 break; 633 case NETDEV_UNREGISTER: 634 case NETDEV_CHANGENAME: 635 bearer_disable(net, b); 636 break; 637 } 638 return NOTIFY_OK; 639 } 640 641 static struct notifier_block notifier = { 642 .notifier_call = tipc_l2_device_event, 643 .priority = 0, 644 }; 645 646 int tipc_bearer_setup(void) 647 { 648 return register_netdevice_notifier(¬ifier); 649 } 650 651 void tipc_bearer_cleanup(void) 652 { 653 unregister_netdevice_notifier(¬ifier); 654 } 655 656 void tipc_bearer_stop(struct net *net) 657 { 658 struct tipc_net *tn = net_generic(net, tipc_net_id); 659 struct tipc_bearer *b; 660 u32 i; 661 662 for (i = 0; i < MAX_BEARERS; i++) { 663 b = rtnl_dereference(tn->bearer_list[i]); 664 if (b) { 665 bearer_disable(net, b); 666 tn->bearer_list[i] = NULL; 667 } 668 } 669 } 670 671 /* Caller should hold rtnl_lock to protect the bearer */ 672 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 673 struct tipc_bearer *bearer, int nlflags) 674 { 675 void *hdr; 676 struct nlattr *attrs; 677 struct nlattr *prop; 678 679 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 680 nlflags, TIPC_NL_BEARER_GET); 681 if (!hdr) 682 return -EMSGSIZE; 683 684 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 685 if (!attrs) 686 goto msg_full; 687 688 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 689 goto attr_msg_full; 690 691 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 692 if (!prop) 693 goto prop_msg_full; 694 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 695 goto prop_msg_full; 696 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 697 goto prop_msg_full; 698 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 699 goto prop_msg_full; 700 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) 701 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu)) 702 goto prop_msg_full; 703 704 nla_nest_end(msg->skb, prop); 705 706 #ifdef CONFIG_TIPC_MEDIA_UDP 707 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) { 708 if (tipc_udp_nl_add_bearer_data(msg, bearer)) 709 goto attr_msg_full; 710 } 711 #endif 712 713 nla_nest_end(msg->skb, attrs); 714 genlmsg_end(msg->skb, hdr); 715 716 return 0; 717 718 prop_msg_full: 719 nla_nest_cancel(msg->skb, prop); 720 attr_msg_full: 721 nla_nest_cancel(msg->skb, attrs); 722 msg_full: 723 genlmsg_cancel(msg->skb, hdr); 724 725 return -EMSGSIZE; 726 } 727 728 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 729 { 730 int err; 731 int i = cb->args[0]; 732 struct tipc_bearer *bearer; 733 struct tipc_nl_msg msg; 734 struct net *net = sock_net(skb->sk); 735 struct tipc_net *tn = net_generic(net, tipc_net_id); 736 737 if (i == MAX_BEARERS) 738 return 0; 739 740 msg.skb = skb; 741 msg.portid = NETLINK_CB(cb->skb).portid; 742 msg.seq = cb->nlh->nlmsg_seq; 743 744 rtnl_lock(); 745 for (i = 0; i < MAX_BEARERS; i++) { 746 bearer = rtnl_dereference(tn->bearer_list[i]); 747 if (!bearer) 748 continue; 749 750 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 751 if (err) 752 break; 753 } 754 rtnl_unlock(); 755 756 cb->args[0] = i; 757 return skb->len; 758 } 759 760 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 761 { 762 int err; 763 char *name; 764 struct sk_buff *rep; 765 struct tipc_bearer *bearer; 766 struct tipc_nl_msg msg; 767 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 768 struct net *net = genl_info_net(info); 769 770 if (!info->attrs[TIPC_NLA_BEARER]) 771 return -EINVAL; 772 773 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 774 info->attrs[TIPC_NLA_BEARER], 775 tipc_nl_bearer_policy, info->extack); 776 if (err) 777 return err; 778 779 if (!attrs[TIPC_NLA_BEARER_NAME]) 780 return -EINVAL; 781 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 782 783 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 784 if (!rep) 785 return -ENOMEM; 786 787 msg.skb = rep; 788 msg.portid = info->snd_portid; 789 msg.seq = info->snd_seq; 790 791 rtnl_lock(); 792 bearer = tipc_bearer_find(net, name); 793 if (!bearer) { 794 err = -EINVAL; 795 goto err_out; 796 } 797 798 err = __tipc_nl_add_bearer(&msg, bearer, 0); 799 if (err) 800 goto err_out; 801 rtnl_unlock(); 802 803 return genlmsg_reply(rep, info); 804 err_out: 805 rtnl_unlock(); 806 nlmsg_free(rep); 807 808 return err; 809 } 810 811 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 812 { 813 int err; 814 char *name; 815 struct tipc_bearer *bearer; 816 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 817 struct net *net = sock_net(skb->sk); 818 819 if (!info->attrs[TIPC_NLA_BEARER]) 820 return -EINVAL; 821 822 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 823 info->attrs[TIPC_NLA_BEARER], 824 tipc_nl_bearer_policy, info->extack); 825 if (err) 826 return err; 827 828 if (!attrs[TIPC_NLA_BEARER_NAME]) 829 return -EINVAL; 830 831 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 832 833 bearer = tipc_bearer_find(net, name); 834 if (!bearer) 835 return -EINVAL; 836 837 bearer_disable(net, bearer); 838 839 return 0; 840 } 841 842 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 843 { 844 int err; 845 846 rtnl_lock(); 847 err = __tipc_nl_bearer_disable(skb, info); 848 rtnl_unlock(); 849 850 return err; 851 } 852 853 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 854 { 855 int err; 856 char *bearer; 857 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 858 struct net *net = sock_net(skb->sk); 859 u32 domain = 0; 860 u32 prio; 861 862 prio = TIPC_MEDIA_LINK_PRI; 863 864 if (!info->attrs[TIPC_NLA_BEARER]) 865 return -EINVAL; 866 867 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 868 info->attrs[TIPC_NLA_BEARER], 869 tipc_nl_bearer_policy, info->extack); 870 if (err) 871 return err; 872 873 if (!attrs[TIPC_NLA_BEARER_NAME]) 874 return -EINVAL; 875 876 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 877 878 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 879 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 880 881 if (attrs[TIPC_NLA_BEARER_PROP]) { 882 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 883 884 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 885 props); 886 if (err) 887 return err; 888 889 if (props[TIPC_NLA_PROP_PRIO]) 890 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 891 } 892 893 return tipc_enable_bearer(net, bearer, domain, prio, attrs); 894 } 895 896 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 897 { 898 int err; 899 900 rtnl_lock(); 901 err = __tipc_nl_bearer_enable(skb, info); 902 rtnl_unlock(); 903 904 return err; 905 } 906 907 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info) 908 { 909 int err; 910 char *name; 911 struct tipc_bearer *b; 912 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 913 struct net *net = sock_net(skb->sk); 914 915 if (!info->attrs[TIPC_NLA_BEARER]) 916 return -EINVAL; 917 918 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 919 info->attrs[TIPC_NLA_BEARER], 920 tipc_nl_bearer_policy, info->extack); 921 if (err) 922 return err; 923 924 if (!attrs[TIPC_NLA_BEARER_NAME]) 925 return -EINVAL; 926 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 927 928 rtnl_lock(); 929 b = tipc_bearer_find(net, name); 930 if (!b) { 931 rtnl_unlock(); 932 return -EINVAL; 933 } 934 935 #ifdef CONFIG_TIPC_MEDIA_UDP 936 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) { 937 err = tipc_udp_nl_bearer_add(b, 938 attrs[TIPC_NLA_BEARER_UDP_OPTS]); 939 if (err) { 940 rtnl_unlock(); 941 return err; 942 } 943 } 944 #endif 945 rtnl_unlock(); 946 947 return 0; 948 } 949 950 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 951 { 952 struct tipc_bearer *b; 953 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 954 struct net *net = sock_net(skb->sk); 955 char *name; 956 int err; 957 958 if (!info->attrs[TIPC_NLA_BEARER]) 959 return -EINVAL; 960 961 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 962 info->attrs[TIPC_NLA_BEARER], 963 tipc_nl_bearer_policy, info->extack); 964 if (err) 965 return err; 966 967 if (!attrs[TIPC_NLA_BEARER_NAME]) 968 return -EINVAL; 969 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 970 971 b = tipc_bearer_find(net, name); 972 if (!b) 973 return -EINVAL; 974 975 if (attrs[TIPC_NLA_BEARER_PROP]) { 976 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 977 978 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 979 props); 980 if (err) 981 return err; 982 983 if (props[TIPC_NLA_PROP_TOL]) { 984 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 985 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL); 986 } 987 if (props[TIPC_NLA_PROP_PRIO]) 988 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 989 if (props[TIPC_NLA_PROP_WIN]) 990 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 991 if (props[TIPC_NLA_PROP_MTU]) { 992 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) 993 return -EINVAL; 994 #ifdef CONFIG_TIPC_MEDIA_UDP 995 if (tipc_udp_mtu_bad(nla_get_u32 996 (props[TIPC_NLA_PROP_MTU]))) 997 return -EINVAL; 998 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); 999 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU); 1000 #endif 1001 } 1002 } 1003 1004 return 0; 1005 } 1006 1007 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 1008 { 1009 int err; 1010 1011 rtnl_lock(); 1012 err = __tipc_nl_bearer_set(skb, info); 1013 rtnl_unlock(); 1014 1015 return err; 1016 } 1017 1018 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 1019 struct tipc_media *media, int nlflags) 1020 { 1021 void *hdr; 1022 struct nlattr *attrs; 1023 struct nlattr *prop; 1024 1025 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 1026 nlflags, TIPC_NL_MEDIA_GET); 1027 if (!hdr) 1028 return -EMSGSIZE; 1029 1030 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 1031 if (!attrs) 1032 goto msg_full; 1033 1034 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 1035 goto attr_msg_full; 1036 1037 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 1038 if (!prop) 1039 goto prop_msg_full; 1040 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 1041 goto prop_msg_full; 1042 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 1043 goto prop_msg_full; 1044 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 1045 goto prop_msg_full; 1046 if (media->type_id == TIPC_MEDIA_TYPE_UDP) 1047 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu)) 1048 goto prop_msg_full; 1049 1050 nla_nest_end(msg->skb, prop); 1051 nla_nest_end(msg->skb, attrs); 1052 genlmsg_end(msg->skb, hdr); 1053 1054 return 0; 1055 1056 prop_msg_full: 1057 nla_nest_cancel(msg->skb, prop); 1058 attr_msg_full: 1059 nla_nest_cancel(msg->skb, attrs); 1060 msg_full: 1061 genlmsg_cancel(msg->skb, hdr); 1062 1063 return -EMSGSIZE; 1064 } 1065 1066 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 1067 { 1068 int err; 1069 int i = cb->args[0]; 1070 struct tipc_nl_msg msg; 1071 1072 if (i == MAX_MEDIA) 1073 return 0; 1074 1075 msg.skb = skb; 1076 msg.portid = NETLINK_CB(cb->skb).portid; 1077 msg.seq = cb->nlh->nlmsg_seq; 1078 1079 rtnl_lock(); 1080 for (; media_info_array[i] != NULL; i++) { 1081 err = __tipc_nl_add_media(&msg, media_info_array[i], 1082 NLM_F_MULTI); 1083 if (err) 1084 break; 1085 } 1086 rtnl_unlock(); 1087 1088 cb->args[0] = i; 1089 return skb->len; 1090 } 1091 1092 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 1093 { 1094 int err; 1095 char *name; 1096 struct tipc_nl_msg msg; 1097 struct tipc_media *media; 1098 struct sk_buff *rep; 1099 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1100 1101 if (!info->attrs[TIPC_NLA_MEDIA]) 1102 return -EINVAL; 1103 1104 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1105 info->attrs[TIPC_NLA_MEDIA], 1106 tipc_nl_media_policy, info->extack); 1107 if (err) 1108 return err; 1109 1110 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1111 return -EINVAL; 1112 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1113 1114 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1115 if (!rep) 1116 return -ENOMEM; 1117 1118 msg.skb = rep; 1119 msg.portid = info->snd_portid; 1120 msg.seq = info->snd_seq; 1121 1122 rtnl_lock(); 1123 media = tipc_media_find(name); 1124 if (!media) { 1125 err = -EINVAL; 1126 goto err_out; 1127 } 1128 1129 err = __tipc_nl_add_media(&msg, media, 0); 1130 if (err) 1131 goto err_out; 1132 rtnl_unlock(); 1133 1134 return genlmsg_reply(rep, info); 1135 err_out: 1136 rtnl_unlock(); 1137 nlmsg_free(rep); 1138 1139 return err; 1140 } 1141 1142 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1143 { 1144 int err; 1145 char *name; 1146 struct tipc_media *m; 1147 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1148 1149 if (!info->attrs[TIPC_NLA_MEDIA]) 1150 return -EINVAL; 1151 1152 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1153 info->attrs[TIPC_NLA_MEDIA], 1154 tipc_nl_media_policy, info->extack); 1155 1156 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1157 return -EINVAL; 1158 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1159 1160 m = tipc_media_find(name); 1161 if (!m) 1162 return -EINVAL; 1163 1164 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1165 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1166 1167 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1168 props); 1169 if (err) 1170 return err; 1171 1172 if (props[TIPC_NLA_PROP_TOL]) 1173 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1174 if (props[TIPC_NLA_PROP_PRIO]) 1175 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1176 if (props[TIPC_NLA_PROP_WIN]) 1177 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1178 if (props[TIPC_NLA_PROP_MTU]) { 1179 if (m->type_id != TIPC_MEDIA_TYPE_UDP) 1180 return -EINVAL; 1181 #ifdef CONFIG_TIPC_MEDIA_UDP 1182 if (tipc_udp_mtu_bad(nla_get_u32 1183 (props[TIPC_NLA_PROP_MTU]))) 1184 return -EINVAL; 1185 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); 1186 #endif 1187 } 1188 } 1189 1190 return 0; 1191 } 1192 1193 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1194 { 1195 int err; 1196 1197 rtnl_lock(); 1198 err = __tipc_nl_media_set(skb, info); 1199 rtnl_unlock(); 1200 1201 return err; 1202 } 1203