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