1 /* 2 * net/tipc/bearer.c: TIPC bearer code 3 * 4 * Copyright (c) 1996-2006, 2013-2014, 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 "core.h" 38 #include "config.h" 39 #include "bearer.h" 40 #include "link.h" 41 #include "discover.h" 42 43 #define MAX_ADDR_STR 60 44 45 static struct tipc_media * const media_info_array[] = { 46 ð_media_info, 47 #ifdef CONFIG_TIPC_MEDIA_IB 48 &ib_media_info, 49 #endif 50 NULL 51 }; 52 53 static const struct nla_policy 54 tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1] = { 55 [TIPC_NLA_BEARER_UNSPEC] = { .type = NLA_UNSPEC }, 56 [TIPC_NLA_BEARER_NAME] = { 57 .type = NLA_STRING, 58 .len = TIPC_MAX_BEARER_NAME 59 }, 60 [TIPC_NLA_BEARER_PROP] = { .type = NLA_NESTED }, 61 [TIPC_NLA_BEARER_DOMAIN] = { .type = NLA_U32 } 62 }; 63 64 static const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = { 65 [TIPC_NLA_MEDIA_UNSPEC] = { .type = NLA_UNSPEC }, 66 [TIPC_NLA_MEDIA_NAME] = { .type = NLA_STRING }, 67 [TIPC_NLA_MEDIA_PROP] = { .type = NLA_NESTED } 68 }; 69 70 struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1]; 71 72 static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down); 73 74 /** 75 * tipc_media_find - locates specified media object by name 76 */ 77 struct tipc_media *tipc_media_find(const char *name) 78 { 79 u32 i; 80 81 for (i = 0; media_info_array[i] != NULL; i++) { 82 if (!strcmp(media_info_array[i]->name, name)) 83 break; 84 } 85 return media_info_array[i]; 86 } 87 88 /** 89 * media_find_id - locates specified media object by type identifier 90 */ 91 static struct tipc_media *media_find_id(u8 type) 92 { 93 u32 i; 94 95 for (i = 0; media_info_array[i] != NULL; i++) { 96 if (media_info_array[i]->type_id == type) 97 break; 98 } 99 return media_info_array[i]; 100 } 101 102 /** 103 * tipc_media_addr_printf - record media address in print buffer 104 */ 105 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) 106 { 107 char addr_str[MAX_ADDR_STR]; 108 struct tipc_media *m_ptr; 109 int ret; 110 111 m_ptr = media_find_id(a->media_id); 112 113 if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str))) 114 ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str); 115 else { 116 u32 i; 117 118 ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id); 119 for (i = 0; i < sizeof(a->value); i++) 120 ret += tipc_snprintf(buf - ret, len + ret, 121 "-%02x", a->value[i]); 122 } 123 } 124 125 /** 126 * tipc_media_get_names - record names of registered media in buffer 127 */ 128 struct sk_buff *tipc_media_get_names(void) 129 { 130 struct sk_buff *buf; 131 int i; 132 133 buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME)); 134 if (!buf) 135 return NULL; 136 137 for (i = 0; media_info_array[i] != NULL; i++) { 138 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, 139 media_info_array[i]->name, 140 strlen(media_info_array[i]->name) + 1); 141 } 142 return buf; 143 } 144 145 /** 146 * bearer_name_validate - validate & (optionally) deconstruct bearer name 147 * @name: ptr to bearer name string 148 * @name_parts: ptr to area for bearer name components (or NULL if not needed) 149 * 150 * Returns 1 if bearer name is valid, otherwise 0. 151 */ 152 static int bearer_name_validate(const char *name, 153 struct tipc_bearer_names *name_parts) 154 { 155 char name_copy[TIPC_MAX_BEARER_NAME]; 156 char *media_name; 157 char *if_name; 158 u32 media_len; 159 u32 if_len; 160 161 /* copy bearer name & ensure length is OK */ 162 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; 163 /* need above in case non-Posix strncpy() doesn't pad with nulls */ 164 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); 165 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) 166 return 0; 167 168 /* ensure all component parts of bearer name are present */ 169 media_name = name_copy; 170 if_name = strchr(media_name, ':'); 171 if (if_name == NULL) 172 return 0; 173 *(if_name++) = 0; 174 media_len = if_name - media_name; 175 if_len = strlen(if_name) + 1; 176 177 /* validate component parts of bearer name */ 178 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || 179 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) 180 return 0; 181 182 /* return bearer name components, if necessary */ 183 if (name_parts) { 184 strcpy(name_parts->media_name, media_name); 185 strcpy(name_parts->if_name, if_name); 186 } 187 return 1; 188 } 189 190 /** 191 * tipc_bearer_find - locates bearer object with matching bearer name 192 */ 193 struct tipc_bearer *tipc_bearer_find(const char *name) 194 { 195 struct tipc_bearer *b_ptr; 196 u32 i; 197 198 for (i = 0; i < MAX_BEARERS; i++) { 199 b_ptr = rtnl_dereference(bearer_list[i]); 200 if (b_ptr && (!strcmp(b_ptr->name, name))) 201 return b_ptr; 202 } 203 return NULL; 204 } 205 206 /** 207 * tipc_bearer_get_names - record names of bearers in buffer 208 */ 209 struct sk_buff *tipc_bearer_get_names(void) 210 { 211 struct sk_buff *buf; 212 struct tipc_bearer *b; 213 int i, j; 214 215 buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME)); 216 if (!buf) 217 return NULL; 218 219 for (i = 0; media_info_array[i] != NULL; i++) { 220 for (j = 0; j < MAX_BEARERS; j++) { 221 b = rtnl_dereference(bearer_list[j]); 222 if (!b) 223 continue; 224 if (b->media == media_info_array[i]) { 225 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME, 226 b->name, 227 strlen(b->name) + 1); 228 } 229 } 230 } 231 return buf; 232 } 233 234 void tipc_bearer_add_dest(u32 bearer_id, u32 dest) 235 { 236 struct tipc_bearer *b_ptr; 237 238 rcu_read_lock(); 239 b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]); 240 if (b_ptr) { 241 tipc_bcbearer_sort(&b_ptr->nodes, dest, true); 242 tipc_disc_add_dest(b_ptr->link_req); 243 } 244 rcu_read_unlock(); 245 } 246 247 void tipc_bearer_remove_dest(u32 bearer_id, u32 dest) 248 { 249 struct tipc_bearer *b_ptr; 250 251 rcu_read_lock(); 252 b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]); 253 if (b_ptr) { 254 tipc_bcbearer_sort(&b_ptr->nodes, dest, false); 255 tipc_disc_remove_dest(b_ptr->link_req); 256 } 257 rcu_read_unlock(); 258 } 259 260 /** 261 * tipc_enable_bearer - enable bearer with the given name 262 */ 263 int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority) 264 { 265 struct tipc_bearer *b_ptr; 266 struct tipc_media *m_ptr; 267 struct tipc_bearer_names b_names; 268 char addr_string[16]; 269 u32 bearer_id; 270 u32 with_this_prio; 271 u32 i; 272 int res = -EINVAL; 273 274 if (!tipc_own_addr) { 275 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", 276 name); 277 return -ENOPROTOOPT; 278 } 279 if (!bearer_name_validate(name, &b_names)) { 280 pr_warn("Bearer <%s> rejected, illegal name\n", name); 281 return -EINVAL; 282 } 283 if (tipc_addr_domain_valid(disc_domain) && 284 (disc_domain != tipc_own_addr)) { 285 if (tipc_in_scope(disc_domain, tipc_own_addr)) { 286 disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK; 287 res = 0; /* accept any node in own cluster */ 288 } else if (in_own_cluster_exact(disc_domain)) 289 res = 0; /* accept specified node in own cluster */ 290 } 291 if (res) { 292 pr_warn("Bearer <%s> rejected, illegal discovery domain\n", 293 name); 294 return -EINVAL; 295 } 296 if ((priority > TIPC_MAX_LINK_PRI) && 297 (priority != TIPC_MEDIA_LINK_PRI)) { 298 pr_warn("Bearer <%s> rejected, illegal priority\n", name); 299 return -EINVAL; 300 } 301 302 m_ptr = tipc_media_find(b_names.media_name); 303 if (!m_ptr) { 304 pr_warn("Bearer <%s> rejected, media <%s> not registered\n", 305 name, b_names.media_name); 306 return -EINVAL; 307 } 308 309 if (priority == TIPC_MEDIA_LINK_PRI) 310 priority = m_ptr->priority; 311 312 restart: 313 bearer_id = MAX_BEARERS; 314 with_this_prio = 1; 315 for (i = MAX_BEARERS; i-- != 0; ) { 316 b_ptr = rtnl_dereference(bearer_list[i]); 317 if (!b_ptr) { 318 bearer_id = i; 319 continue; 320 } 321 if (!strcmp(name, b_ptr->name)) { 322 pr_warn("Bearer <%s> rejected, already enabled\n", 323 name); 324 return -EINVAL; 325 } 326 if ((b_ptr->priority == priority) && 327 (++with_this_prio > 2)) { 328 if (priority-- == 0) { 329 pr_warn("Bearer <%s> rejected, duplicate priority\n", 330 name); 331 return -EINVAL; 332 } 333 pr_warn("Bearer <%s> priority adjustment required %u->%u\n", 334 name, priority + 1, priority); 335 goto restart; 336 } 337 } 338 if (bearer_id >= MAX_BEARERS) { 339 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", 340 name, MAX_BEARERS); 341 return -EINVAL; 342 } 343 344 b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC); 345 if (!b_ptr) 346 return -ENOMEM; 347 348 strcpy(b_ptr->name, name); 349 b_ptr->media = m_ptr; 350 res = m_ptr->enable_media(b_ptr); 351 if (res) { 352 pr_warn("Bearer <%s> rejected, enable failure (%d)\n", 353 name, -res); 354 return -EINVAL; 355 } 356 357 b_ptr->identity = bearer_id; 358 b_ptr->tolerance = m_ptr->tolerance; 359 b_ptr->window = m_ptr->window; 360 b_ptr->domain = disc_domain; 361 b_ptr->net_plane = bearer_id + 'A'; 362 b_ptr->priority = priority; 363 364 res = tipc_disc_create(b_ptr, &b_ptr->bcast_addr); 365 if (res) { 366 bearer_disable(b_ptr, false); 367 pr_warn("Bearer <%s> rejected, discovery object creation failed\n", 368 name); 369 return -EINVAL; 370 } 371 372 rcu_assign_pointer(bearer_list[bearer_id], b_ptr); 373 374 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", 375 name, 376 tipc_addr_string_fill(addr_string, disc_domain), priority); 377 return res; 378 } 379 380 /** 381 * tipc_reset_bearer - Reset all links established over this bearer 382 */ 383 static int tipc_reset_bearer(struct tipc_bearer *b_ptr) 384 { 385 pr_info("Resetting bearer <%s>\n", b_ptr->name); 386 tipc_link_reset_list(b_ptr->identity); 387 tipc_disc_reset(b_ptr); 388 return 0; 389 } 390 391 /** 392 * bearer_disable 393 * 394 * Note: This routine assumes caller holds RTNL lock. 395 */ 396 static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down) 397 { 398 u32 i; 399 400 pr_info("Disabling bearer <%s>\n", b_ptr->name); 401 b_ptr->media->disable_media(b_ptr); 402 403 tipc_link_delete_list(b_ptr->identity, shutting_down); 404 if (b_ptr->link_req) 405 tipc_disc_delete(b_ptr->link_req); 406 407 for (i = 0; i < MAX_BEARERS; i++) { 408 if (b_ptr == rtnl_dereference(bearer_list[i])) { 409 RCU_INIT_POINTER(bearer_list[i], NULL); 410 break; 411 } 412 } 413 kfree_rcu(b_ptr, rcu); 414 } 415 416 int tipc_disable_bearer(const char *name) 417 { 418 struct tipc_bearer *b_ptr; 419 int res; 420 421 b_ptr = tipc_bearer_find(name); 422 if (b_ptr == NULL) { 423 pr_warn("Attempt to disable unknown bearer <%s>\n", name); 424 res = -EINVAL; 425 } else { 426 bearer_disable(b_ptr, false); 427 res = 0; 428 } 429 return res; 430 } 431 432 int tipc_enable_l2_media(struct tipc_bearer *b) 433 { 434 struct net_device *dev; 435 char *driver_name = strchr((const char *)b->name, ':') + 1; 436 437 /* Find device with specified name */ 438 dev = dev_get_by_name(&init_net, driver_name); 439 if (!dev) 440 return -ENODEV; 441 442 /* Associate TIPC bearer with L2 bearer */ 443 rcu_assign_pointer(b->media_ptr, dev); 444 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 445 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); 446 b->bcast_addr.media_id = b->media->type_id; 447 b->bcast_addr.broadcast = 1; 448 b->mtu = dev->mtu; 449 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 450 rcu_assign_pointer(dev->tipc_ptr, b); 451 return 0; 452 } 453 454 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 455 * 456 * Mark L2 bearer as inactive so that incoming buffers are thrown away, 457 * then get worker thread to complete bearer cleanup. (Can't do cleanup 458 * here because cleanup code needs to sleep and caller holds spinlocks.) 459 */ 460 void tipc_disable_l2_media(struct tipc_bearer *b) 461 { 462 struct net_device *dev; 463 464 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 465 RCU_INIT_POINTER(b->media_ptr, NULL); 466 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 467 synchronize_net(); 468 dev_put(dev); 469 } 470 471 /** 472 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 473 * @buf: the packet to be sent 474 * @b_ptr: the bearer through which the packet is to be sent 475 * @dest: peer destination address 476 */ 477 int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b, 478 struct tipc_media_addr *dest) 479 { 480 struct sk_buff *clone; 481 struct net_device *dev; 482 int delta; 483 484 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 485 if (!dev) 486 return 0; 487 488 clone = skb_clone(buf, GFP_ATOMIC); 489 if (!clone) 490 return 0; 491 492 delta = dev->hard_header_len - skb_headroom(buf); 493 if ((delta > 0) && 494 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { 495 kfree_skb(clone); 496 return 0; 497 } 498 499 skb_reset_network_header(clone); 500 clone->dev = dev; 501 clone->protocol = htons(ETH_P_TIPC); 502 dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, 503 dev->dev_addr, clone->len); 504 dev_queue_xmit(clone); 505 return 0; 506 } 507 508 /* tipc_bearer_send- sends buffer to destination over bearer 509 * 510 * IMPORTANT: 511 * The media send routine must not alter the buffer being passed in 512 * as it may be needed for later retransmission! 513 */ 514 void tipc_bearer_send(u32 bearer_id, struct sk_buff *buf, 515 struct tipc_media_addr *dest) 516 { 517 struct tipc_bearer *b_ptr; 518 519 rcu_read_lock(); 520 b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]); 521 if (likely(b_ptr)) 522 b_ptr->media->send_msg(buf, b_ptr, dest); 523 rcu_read_unlock(); 524 } 525 526 /** 527 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 528 * @buf: the received packet 529 * @dev: the net device that the packet was received on 530 * @pt: the packet_type structure which was used to register this handler 531 * @orig_dev: the original receive net device in case the device is a bond 532 * 533 * Accept only packets explicitly sent to this node, or broadcast packets; 534 * ignores packets sent using interface multicast, and traffic sent to other 535 * nodes (which can happen if interface is running in promiscuous mode). 536 */ 537 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev, 538 struct packet_type *pt, struct net_device *orig_dev) 539 { 540 struct tipc_bearer *b_ptr; 541 542 if (!net_eq(dev_net(dev), &init_net)) { 543 kfree_skb(buf); 544 return NET_RX_DROP; 545 } 546 547 rcu_read_lock(); 548 b_ptr = rcu_dereference_rtnl(dev->tipc_ptr); 549 if (likely(b_ptr)) { 550 if (likely(buf->pkt_type <= PACKET_BROADCAST)) { 551 buf->next = NULL; 552 tipc_rcv(buf, b_ptr); 553 rcu_read_unlock(); 554 return NET_RX_SUCCESS; 555 } 556 } 557 rcu_read_unlock(); 558 559 kfree_skb(buf); 560 return NET_RX_DROP; 561 } 562 563 /** 564 * tipc_l2_device_event - handle device events from network device 565 * @nb: the context of the notification 566 * @evt: the type of event 567 * @ptr: the net device that the event was on 568 * 569 * This function is called by the Ethernet driver in case of link 570 * change event. 571 */ 572 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 573 void *ptr) 574 { 575 struct tipc_bearer *b_ptr; 576 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 577 578 if (!net_eq(dev_net(dev), &init_net)) 579 return NOTIFY_DONE; 580 581 b_ptr = rtnl_dereference(dev->tipc_ptr); 582 if (!b_ptr) 583 return NOTIFY_DONE; 584 585 b_ptr->mtu = dev->mtu; 586 587 switch (evt) { 588 case NETDEV_CHANGE: 589 if (netif_carrier_ok(dev)) 590 break; 591 case NETDEV_DOWN: 592 case NETDEV_CHANGEMTU: 593 tipc_reset_bearer(b_ptr); 594 break; 595 case NETDEV_CHANGEADDR: 596 b_ptr->media->raw2addr(b_ptr, &b_ptr->addr, 597 (char *)dev->dev_addr); 598 tipc_reset_bearer(b_ptr); 599 break; 600 case NETDEV_UNREGISTER: 601 case NETDEV_CHANGENAME: 602 bearer_disable(b_ptr, false); 603 break; 604 } 605 return NOTIFY_OK; 606 } 607 608 static struct packet_type tipc_packet_type __read_mostly = { 609 .type = htons(ETH_P_TIPC), 610 .func = tipc_l2_rcv_msg, 611 }; 612 613 static struct notifier_block notifier = { 614 .notifier_call = tipc_l2_device_event, 615 .priority = 0, 616 }; 617 618 int tipc_bearer_setup(void) 619 { 620 int err; 621 622 err = register_netdevice_notifier(¬ifier); 623 if (err) 624 return err; 625 dev_add_pack(&tipc_packet_type); 626 return 0; 627 } 628 629 void tipc_bearer_cleanup(void) 630 { 631 unregister_netdevice_notifier(¬ifier); 632 dev_remove_pack(&tipc_packet_type); 633 } 634 635 void tipc_bearer_stop(void) 636 { 637 struct tipc_bearer *b_ptr; 638 u32 i; 639 640 for (i = 0; i < MAX_BEARERS; i++) { 641 b_ptr = rtnl_dereference(bearer_list[i]); 642 if (b_ptr) { 643 bearer_disable(b_ptr, true); 644 bearer_list[i] = NULL; 645 } 646 } 647 } 648 649 /* Caller should hold rtnl_lock to protect the bearer */ 650 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 651 struct tipc_bearer *bearer) 652 { 653 void *hdr; 654 struct nlattr *attrs; 655 struct nlattr *prop; 656 657 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family, 658 NLM_F_MULTI, TIPC_NL_BEARER_GET); 659 if (!hdr) 660 return -EMSGSIZE; 661 662 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 663 if (!attrs) 664 goto msg_full; 665 666 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 667 goto attr_msg_full; 668 669 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 670 if (!prop) 671 goto prop_msg_full; 672 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 673 goto prop_msg_full; 674 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 675 goto prop_msg_full; 676 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 677 goto prop_msg_full; 678 679 nla_nest_end(msg->skb, prop); 680 nla_nest_end(msg->skb, attrs); 681 genlmsg_end(msg->skb, hdr); 682 683 return 0; 684 685 prop_msg_full: 686 nla_nest_cancel(msg->skb, prop); 687 attr_msg_full: 688 nla_nest_cancel(msg->skb, attrs); 689 msg_full: 690 genlmsg_cancel(msg->skb, hdr); 691 692 return -EMSGSIZE; 693 } 694 695 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 696 { 697 int err; 698 int i = cb->args[0]; 699 struct tipc_bearer *bearer; 700 struct tipc_nl_msg msg; 701 702 if (i == MAX_BEARERS) 703 return 0; 704 705 msg.skb = skb; 706 msg.portid = NETLINK_CB(cb->skb).portid; 707 msg.seq = cb->nlh->nlmsg_seq; 708 709 rtnl_lock(); 710 for (i = 0; i < MAX_BEARERS; i++) { 711 bearer = rtnl_dereference(bearer_list[i]); 712 if (!bearer) 713 continue; 714 715 err = __tipc_nl_add_bearer(&msg, bearer); 716 if (err) 717 break; 718 } 719 rtnl_unlock(); 720 721 cb->args[0] = i; 722 return skb->len; 723 } 724 725 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 726 { 727 int err; 728 char *name; 729 struct sk_buff *rep; 730 struct tipc_bearer *bearer; 731 struct tipc_nl_msg msg; 732 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 733 734 if (!info->attrs[TIPC_NLA_BEARER]) 735 return -EINVAL; 736 737 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 738 info->attrs[TIPC_NLA_BEARER], 739 tipc_nl_bearer_policy); 740 if (err) 741 return err; 742 743 if (!attrs[TIPC_NLA_BEARER_NAME]) 744 return -EINVAL; 745 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 746 747 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 748 if (!rep) 749 return -ENOMEM; 750 751 msg.skb = rep; 752 msg.portid = info->snd_portid; 753 msg.seq = info->snd_seq; 754 755 rtnl_lock(); 756 bearer = tipc_bearer_find(name); 757 if (!bearer) { 758 err = -EINVAL; 759 goto err_out; 760 } 761 762 err = __tipc_nl_add_bearer(&msg, bearer); 763 if (err) 764 goto err_out; 765 rtnl_unlock(); 766 767 return genlmsg_reply(rep, info); 768 err_out: 769 rtnl_unlock(); 770 nlmsg_free(rep); 771 772 return err; 773 } 774 775 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 776 { 777 int err; 778 char *name; 779 struct tipc_bearer *bearer; 780 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 781 782 if (!info->attrs[TIPC_NLA_BEARER]) 783 return -EINVAL; 784 785 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 786 info->attrs[TIPC_NLA_BEARER], 787 tipc_nl_bearer_policy); 788 if (err) 789 return err; 790 791 if (!attrs[TIPC_NLA_BEARER_NAME]) 792 return -EINVAL; 793 794 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 795 796 rtnl_lock(); 797 bearer = tipc_bearer_find(name); 798 if (!bearer) { 799 rtnl_unlock(); 800 return -EINVAL; 801 } 802 803 bearer_disable(bearer, false); 804 rtnl_unlock(); 805 806 return 0; 807 } 808 809 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 810 { 811 int err; 812 char *bearer; 813 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 814 u32 domain; 815 u32 prio; 816 817 prio = TIPC_MEDIA_LINK_PRI; 818 domain = tipc_own_addr & TIPC_CLUSTER_MASK; 819 820 if (!info->attrs[TIPC_NLA_BEARER]) 821 return -EINVAL; 822 823 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 824 info->attrs[TIPC_NLA_BEARER], 825 tipc_nl_bearer_policy); 826 if (err) 827 return err; 828 829 if (!attrs[TIPC_NLA_BEARER_NAME]) 830 return -EINVAL; 831 832 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 833 834 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 835 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 836 837 if (attrs[TIPC_NLA_BEARER_PROP]) { 838 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 839 840 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 841 props); 842 if (err) 843 return err; 844 845 if (props[TIPC_NLA_PROP_PRIO]) 846 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 847 } 848 849 rtnl_lock(); 850 err = tipc_enable_bearer(bearer, domain, prio); 851 if (err) { 852 rtnl_unlock(); 853 return err; 854 } 855 rtnl_unlock(); 856 857 return 0; 858 } 859 860 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 861 { 862 int err; 863 char *name; 864 struct tipc_bearer *b; 865 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 866 867 if (!info->attrs[TIPC_NLA_BEARER]) 868 return -EINVAL; 869 870 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 871 info->attrs[TIPC_NLA_BEARER], 872 tipc_nl_bearer_policy); 873 if (err) 874 return err; 875 876 if (!attrs[TIPC_NLA_BEARER_NAME]) 877 return -EINVAL; 878 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 879 880 rtnl_lock(); 881 b = tipc_bearer_find(name); 882 if (!b) { 883 rtnl_unlock(); 884 return -EINVAL; 885 } 886 887 if (attrs[TIPC_NLA_BEARER_PROP]) { 888 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 889 890 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 891 props); 892 if (err) { 893 rtnl_unlock(); 894 return err; 895 } 896 897 if (props[TIPC_NLA_PROP_TOL]) 898 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 899 if (props[TIPC_NLA_PROP_PRIO]) 900 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 901 if (props[TIPC_NLA_PROP_WIN]) 902 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 903 } 904 rtnl_unlock(); 905 906 return 0; 907 } 908 909 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 910 struct tipc_media *media) 911 { 912 void *hdr; 913 struct nlattr *attrs; 914 struct nlattr *prop; 915 916 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family, 917 NLM_F_MULTI, TIPC_NL_MEDIA_GET); 918 if (!hdr) 919 return -EMSGSIZE; 920 921 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 922 if (!attrs) 923 goto msg_full; 924 925 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 926 goto attr_msg_full; 927 928 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 929 if (!prop) 930 goto prop_msg_full; 931 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 932 goto prop_msg_full; 933 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 934 goto prop_msg_full; 935 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 936 goto prop_msg_full; 937 938 nla_nest_end(msg->skb, prop); 939 nla_nest_end(msg->skb, attrs); 940 genlmsg_end(msg->skb, hdr); 941 942 return 0; 943 944 prop_msg_full: 945 nla_nest_cancel(msg->skb, prop); 946 attr_msg_full: 947 nla_nest_cancel(msg->skb, attrs); 948 msg_full: 949 genlmsg_cancel(msg->skb, hdr); 950 951 return -EMSGSIZE; 952 } 953 954 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 955 { 956 int err; 957 int i = cb->args[0]; 958 struct tipc_nl_msg msg; 959 960 if (i == MAX_MEDIA) 961 return 0; 962 963 msg.skb = skb; 964 msg.portid = NETLINK_CB(cb->skb).portid; 965 msg.seq = cb->nlh->nlmsg_seq; 966 967 rtnl_lock(); 968 for (; media_info_array[i] != NULL; i++) { 969 err = __tipc_nl_add_media(&msg, media_info_array[i]); 970 if (err) 971 break; 972 } 973 rtnl_unlock(); 974 975 cb->args[0] = i; 976 return skb->len; 977 } 978 979 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 980 { 981 int err; 982 char *name; 983 struct tipc_nl_msg msg; 984 struct tipc_media *media; 985 struct sk_buff *rep; 986 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 987 988 if (!info->attrs[TIPC_NLA_MEDIA]) 989 return -EINVAL; 990 991 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 992 info->attrs[TIPC_NLA_MEDIA], 993 tipc_nl_media_policy); 994 if (err) 995 return err; 996 997 if (!attrs[TIPC_NLA_MEDIA_NAME]) 998 return -EINVAL; 999 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1000 1001 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1002 if (!rep) 1003 return -ENOMEM; 1004 1005 msg.skb = rep; 1006 msg.portid = info->snd_portid; 1007 msg.seq = info->snd_seq; 1008 1009 rtnl_lock(); 1010 media = tipc_media_find(name); 1011 if (!media) { 1012 err = -EINVAL; 1013 goto err_out; 1014 } 1015 1016 err = __tipc_nl_add_media(&msg, media); 1017 if (err) 1018 goto err_out; 1019 rtnl_unlock(); 1020 1021 return genlmsg_reply(rep, info); 1022 err_out: 1023 rtnl_unlock(); 1024 nlmsg_free(rep); 1025 1026 return err; 1027 } 1028 1029 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1030 { 1031 int err; 1032 char *name; 1033 struct tipc_media *m; 1034 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1035 1036 if (!info->attrs[TIPC_NLA_MEDIA]) 1037 return -EINVAL; 1038 1039 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1040 info->attrs[TIPC_NLA_MEDIA], 1041 tipc_nl_media_policy); 1042 1043 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1044 return -EINVAL; 1045 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1046 1047 rtnl_lock(); 1048 m = tipc_media_find(name); 1049 if (!m) { 1050 rtnl_unlock(); 1051 return -EINVAL; 1052 } 1053 1054 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1055 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1056 1057 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1058 props); 1059 if (err) { 1060 rtnl_unlock(); 1061 return err; 1062 } 1063 1064 if (props[TIPC_NLA_PROP_TOL]) 1065 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1066 if (props[TIPC_NLA_PROP_PRIO]) 1067 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1068 if (props[TIPC_NLA_PROP_WIN]) 1069 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1070 } 1071 rtnl_unlock(); 1072 1073 return 0; 1074 } 1075