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->link_req); 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->link_req); 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 priority, 234 struct nlattr *attr[]) 235 { 236 struct tipc_net *tn = net_generic(net, tipc_net_id); 237 struct tipc_bearer *b; 238 struct tipc_media *m; 239 struct tipc_bearer_names b_names; 240 struct sk_buff *skb; 241 char addr_string[16]; 242 u32 bearer_id; 243 u32 with_this_prio; 244 u32 i; 245 int res = -EINVAL; 246 247 if (!tn->own_addr) { 248 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", 249 name); 250 return -ENOPROTOOPT; 251 } 252 if (!bearer_name_validate(name, &b_names)) { 253 pr_warn("Bearer <%s> rejected, illegal name\n", name); 254 return -EINVAL; 255 } 256 if (tipc_addr_domain_valid(disc_domain) && 257 (disc_domain != tn->own_addr)) { 258 if (tipc_in_scope(disc_domain, tn->own_addr)) { 259 disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK; 260 res = 0; /* accept any node in own cluster */ 261 } else if (in_own_cluster_exact(net, disc_domain)) 262 res = 0; /* accept specified node in own cluster */ 263 } 264 if (res) { 265 pr_warn("Bearer <%s> rejected, illegal discovery domain\n", 266 name); 267 return -EINVAL; 268 } 269 if ((priority > TIPC_MAX_LINK_PRI) && 270 (priority != TIPC_MEDIA_LINK_PRI)) { 271 pr_warn("Bearer <%s> rejected, illegal priority\n", name); 272 return -EINVAL; 273 } 274 275 m = tipc_media_find(b_names.media_name); 276 if (!m) { 277 pr_warn("Bearer <%s> rejected, media <%s> not registered\n", 278 name, b_names.media_name); 279 return -EINVAL; 280 } 281 282 if (priority == TIPC_MEDIA_LINK_PRI) 283 priority = m->priority; 284 285 restart: 286 bearer_id = MAX_BEARERS; 287 with_this_prio = 1; 288 for (i = MAX_BEARERS; i-- != 0; ) { 289 b = rtnl_dereference(tn->bearer_list[i]); 290 if (!b) { 291 bearer_id = i; 292 continue; 293 } 294 if (!strcmp(name, b->name)) { 295 pr_warn("Bearer <%s> rejected, already enabled\n", 296 name); 297 return -EINVAL; 298 } 299 if ((b->priority == priority) && 300 (++with_this_prio > 2)) { 301 if (priority-- == 0) { 302 pr_warn("Bearer <%s> rejected, duplicate priority\n", 303 name); 304 return -EINVAL; 305 } 306 pr_warn("Bearer <%s> priority adjustment required %u->%u\n", 307 name, priority + 1, priority); 308 goto restart; 309 } 310 } 311 if (bearer_id >= MAX_BEARERS) { 312 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", 313 name, MAX_BEARERS); 314 return -EINVAL; 315 } 316 317 b = kzalloc(sizeof(*b), GFP_ATOMIC); 318 if (!b) 319 return -ENOMEM; 320 321 strcpy(b->name, name); 322 b->media = m; 323 res = m->enable_media(net, b, attr); 324 if (res) { 325 pr_warn("Bearer <%s> rejected, enable failure (%d)\n", 326 name, -res); 327 kfree(b); 328 return -EINVAL; 329 } 330 331 b->identity = bearer_id; 332 b->tolerance = m->tolerance; 333 b->window = m->window; 334 b->domain = disc_domain; 335 b->net_plane = bearer_id + 'A'; 336 b->priority = priority; 337 test_and_set_bit_lock(0, &b->up); 338 339 res = tipc_disc_create(net, b, &b->bcast_addr, &skb); 340 if (res) { 341 bearer_disable(net, b); 342 pr_warn("Bearer <%s> rejected, discovery object creation failed\n", 343 name); 344 return -EINVAL; 345 } 346 347 rcu_assign_pointer(tn->bearer_list[bearer_id], b); 348 if (skb) 349 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); 350 351 if (tipc_mon_create(net, bearer_id)) { 352 bearer_disable(net, b); 353 return -ENOMEM; 354 } 355 356 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", 357 name, 358 tipc_addr_string_fill(addr_string, disc_domain), priority); 359 return res; 360 } 361 362 /** 363 * tipc_reset_bearer - Reset all links established over this bearer 364 */ 365 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) 366 { 367 pr_info("Resetting bearer <%s>\n", b->name); 368 tipc_node_delete_links(net, b->identity); 369 tipc_disc_reset(net, b); 370 return 0; 371 } 372 373 /** 374 * bearer_disable 375 * 376 * Note: This routine assumes caller holds RTNL lock. 377 */ 378 static void bearer_disable(struct net *net, struct tipc_bearer *b) 379 { 380 struct tipc_net *tn = tipc_net(net); 381 int bearer_id = b->identity; 382 383 pr_info("Disabling bearer <%s>\n", b->name); 384 clear_bit_unlock(0, &b->up); 385 tipc_node_delete_links(net, bearer_id); 386 b->media->disable_media(b); 387 RCU_INIT_POINTER(b->media_ptr, NULL); 388 if (b->link_req) 389 tipc_disc_delete(b->link_req); 390 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); 391 kfree_rcu(b, rcu); 392 tipc_mon_delete(net, bearer_id); 393 } 394 395 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 396 struct nlattr *attr[]) 397 { 398 struct net_device *dev; 399 char *driver_name = strchr((const char *)b->name, ':') + 1; 400 401 /* Find device with specified name */ 402 dev = dev_get_by_name(net, driver_name); 403 if (!dev) 404 return -ENODEV; 405 if (tipc_mtu_bad(dev, 0)) { 406 dev_put(dev); 407 return -EINVAL; 408 } 409 410 /* Associate TIPC bearer with L2 bearer */ 411 rcu_assign_pointer(b->media_ptr, dev); 412 b->pt.dev = dev; 413 b->pt.type = htons(ETH_P_TIPC); 414 b->pt.func = tipc_l2_rcv_msg; 415 dev_add_pack(&b->pt); 416 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 417 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); 418 b->bcast_addr.media_id = b->media->type_id; 419 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 420 b->mtu = dev->mtu; 421 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 422 rcu_assign_pointer(dev->tipc_ptr, b); 423 return 0; 424 } 425 426 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 427 * 428 * Mark L2 bearer as inactive so that incoming buffers are thrown away 429 */ 430 void tipc_disable_l2_media(struct tipc_bearer *b) 431 { 432 struct net_device *dev; 433 434 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 435 dev_remove_pack(&b->pt); 436 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 437 synchronize_net(); 438 dev_put(dev); 439 } 440 441 /** 442 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 443 * @skb: the packet to be sent 444 * @b: the bearer through which the packet is to be sent 445 * @dest: peer destination address 446 */ 447 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, 448 struct tipc_bearer *b, struct tipc_media_addr *dest) 449 { 450 struct net_device *dev; 451 int delta; 452 453 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 454 if (!dev) 455 return 0; 456 457 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); 458 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) { 459 kfree_skb(skb); 460 return 0; 461 } 462 skb_reset_network_header(skb); 463 skb->dev = dev; 464 skb->protocol = htons(ETH_P_TIPC); 465 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, 466 dev->dev_addr, skb->len); 467 dev_queue_xmit(skb); 468 return 0; 469 } 470 471 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id) 472 { 473 bool supp = false; 474 struct tipc_bearer *b; 475 476 rcu_read_lock(); 477 b = bearer_get(net, bearer_id); 478 if (b) 479 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT); 480 rcu_read_unlock(); 481 return supp; 482 } 483 484 int tipc_bearer_mtu(struct net *net, u32 bearer_id) 485 { 486 int mtu = 0; 487 struct tipc_bearer *b; 488 489 rcu_read_lock(); 490 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]); 491 if (b) 492 mtu = b->mtu; 493 rcu_read_unlock(); 494 return mtu; 495 } 496 497 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer 498 */ 499 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, 500 struct sk_buff *skb, 501 struct tipc_media_addr *dest) 502 { 503 struct tipc_msg *hdr = buf_msg(skb); 504 struct tipc_bearer *b; 505 506 rcu_read_lock(); 507 b = bearer_get(net, bearer_id); 508 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) 509 b->media->send_msg(net, skb, b, dest); 510 else 511 kfree_skb(skb); 512 rcu_read_unlock(); 513 } 514 515 /* tipc_bearer_xmit() -send buffer to destination over bearer 516 */ 517 void tipc_bearer_xmit(struct net *net, u32 bearer_id, 518 struct sk_buff_head *xmitq, 519 struct tipc_media_addr *dst) 520 { 521 struct tipc_bearer *b; 522 struct sk_buff *skb, *tmp; 523 524 if (skb_queue_empty(xmitq)) 525 return; 526 527 rcu_read_lock(); 528 b = bearer_get(net, bearer_id); 529 if (unlikely(!b)) 530 __skb_queue_purge(xmitq); 531 skb_queue_walk_safe(xmitq, skb, tmp) { 532 __skb_dequeue(xmitq); 533 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) 534 b->media->send_msg(net, skb, b, dst); 535 else 536 kfree_skb(skb); 537 } 538 rcu_read_unlock(); 539 } 540 541 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations 542 */ 543 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 544 struct sk_buff_head *xmitq) 545 { 546 struct tipc_net *tn = tipc_net(net); 547 int net_id = tn->net_id; 548 struct tipc_bearer *b; 549 struct sk_buff *skb, *tmp; 550 struct tipc_msg *hdr; 551 552 rcu_read_lock(); 553 b = bearer_get(net, bearer_id); 554 if (unlikely(!b || !test_bit(0, &b->up))) 555 __skb_queue_purge(xmitq); 556 skb_queue_walk_safe(xmitq, skb, tmp) { 557 hdr = buf_msg(skb); 558 msg_set_non_seq(hdr, 1); 559 msg_set_mc_netid(hdr, net_id); 560 __skb_dequeue(xmitq); 561 b->media->send_msg(net, skb, b, &b->bcast_addr); 562 } 563 rcu_read_unlock(); 564 } 565 566 /** 567 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 568 * @buf: the received packet 569 * @dev: the net device that the packet was received on 570 * @pt: the packet_type structure which was used to register this handler 571 * @orig_dev: the original receive net device in case the device is a bond 572 * 573 * Accept only packets explicitly sent to this node, or broadcast packets; 574 * ignores packets sent using interface multicast, and traffic sent to other 575 * nodes (which can happen if interface is running in promiscuous mode). 576 */ 577 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, 578 struct packet_type *pt, struct net_device *orig_dev) 579 { 580 struct tipc_bearer *b; 581 582 rcu_read_lock(); 583 b = rcu_dereference_rtnl(dev->tipc_ptr) ?: 584 rcu_dereference_rtnl(orig_dev->tipc_ptr); 585 if (likely(b && test_bit(0, &b->up) && 586 (skb->pkt_type <= PACKET_MULTICAST))) { 587 skb->next = NULL; 588 tipc_rcv(dev_net(b->pt.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(net, b); 644 break; 645 } 646 return NOTIFY_OK; 647 } 648 649 static struct notifier_block notifier = { 650 .notifier_call = tipc_l2_device_event, 651 .priority = 0, 652 }; 653 654 int tipc_bearer_setup(void) 655 { 656 return register_netdevice_notifier(¬ifier); 657 } 658 659 void tipc_bearer_cleanup(void) 660 { 661 unregister_netdevice_notifier(¬ifier); 662 } 663 664 void tipc_bearer_stop(struct net *net) 665 { 666 struct tipc_net *tn = net_generic(net, tipc_net_id); 667 struct tipc_bearer *b; 668 u32 i; 669 670 for (i = 0; i < MAX_BEARERS; i++) { 671 b = rtnl_dereference(tn->bearer_list[i]); 672 if (b) { 673 bearer_disable(net, b); 674 tn->bearer_list[i] = NULL; 675 } 676 } 677 } 678 679 /* Caller should hold rtnl_lock to protect the bearer */ 680 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 681 struct tipc_bearer *bearer, int nlflags) 682 { 683 void *hdr; 684 struct nlattr *attrs; 685 struct nlattr *prop; 686 687 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 688 nlflags, TIPC_NL_BEARER_GET); 689 if (!hdr) 690 return -EMSGSIZE; 691 692 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 693 if (!attrs) 694 goto msg_full; 695 696 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 697 goto attr_msg_full; 698 699 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 700 if (!prop) 701 goto prop_msg_full; 702 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 703 goto prop_msg_full; 704 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 705 goto prop_msg_full; 706 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 707 goto prop_msg_full; 708 709 nla_nest_end(msg->skb, prop); 710 711 #ifdef CONFIG_TIPC_MEDIA_UDP 712 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) { 713 if (tipc_udp_nl_add_bearer_data(msg, bearer)) 714 goto attr_msg_full; 715 } 716 #endif 717 718 nla_nest_end(msg->skb, attrs); 719 genlmsg_end(msg->skb, hdr); 720 721 return 0; 722 723 prop_msg_full: 724 nla_nest_cancel(msg->skb, prop); 725 attr_msg_full: 726 nla_nest_cancel(msg->skb, attrs); 727 msg_full: 728 genlmsg_cancel(msg->skb, hdr); 729 730 return -EMSGSIZE; 731 } 732 733 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 734 { 735 int err; 736 int i = cb->args[0]; 737 struct tipc_bearer *bearer; 738 struct tipc_nl_msg msg; 739 struct net *net = sock_net(skb->sk); 740 struct tipc_net *tn = net_generic(net, tipc_net_id); 741 742 if (i == MAX_BEARERS) 743 return 0; 744 745 msg.skb = skb; 746 msg.portid = NETLINK_CB(cb->skb).portid; 747 msg.seq = cb->nlh->nlmsg_seq; 748 749 rtnl_lock(); 750 for (i = 0; i < MAX_BEARERS; i++) { 751 bearer = rtnl_dereference(tn->bearer_list[i]); 752 if (!bearer) 753 continue; 754 755 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 756 if (err) 757 break; 758 } 759 rtnl_unlock(); 760 761 cb->args[0] = i; 762 return skb->len; 763 } 764 765 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 766 { 767 int err; 768 char *name; 769 struct sk_buff *rep; 770 struct tipc_bearer *bearer; 771 struct tipc_nl_msg msg; 772 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 773 struct net *net = genl_info_net(info); 774 775 if (!info->attrs[TIPC_NLA_BEARER]) 776 return -EINVAL; 777 778 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 779 info->attrs[TIPC_NLA_BEARER], 780 tipc_nl_bearer_policy, info->extack); 781 if (err) 782 return err; 783 784 if (!attrs[TIPC_NLA_BEARER_NAME]) 785 return -EINVAL; 786 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 787 788 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 789 if (!rep) 790 return -ENOMEM; 791 792 msg.skb = rep; 793 msg.portid = info->snd_portid; 794 msg.seq = info->snd_seq; 795 796 rtnl_lock(); 797 bearer = tipc_bearer_find(net, name); 798 if (!bearer) { 799 err = -EINVAL; 800 goto err_out; 801 } 802 803 err = __tipc_nl_add_bearer(&msg, bearer, 0); 804 if (err) 805 goto err_out; 806 rtnl_unlock(); 807 808 return genlmsg_reply(rep, info); 809 err_out: 810 rtnl_unlock(); 811 nlmsg_free(rep); 812 813 return err; 814 } 815 816 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 817 { 818 int err; 819 char *name; 820 struct tipc_bearer *bearer; 821 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 822 struct net *net = sock_net(skb->sk); 823 824 if (!info->attrs[TIPC_NLA_BEARER]) 825 return -EINVAL; 826 827 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 828 info->attrs[TIPC_NLA_BEARER], 829 tipc_nl_bearer_policy, info->extack); 830 if (err) 831 return err; 832 833 if (!attrs[TIPC_NLA_BEARER_NAME]) 834 return -EINVAL; 835 836 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 837 838 rtnl_lock(); 839 bearer = tipc_bearer_find(net, name); 840 if (!bearer) { 841 rtnl_unlock(); 842 return -EINVAL; 843 } 844 845 bearer_disable(net, bearer); 846 rtnl_unlock(); 847 848 return 0; 849 } 850 851 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 852 { 853 int err; 854 char *bearer; 855 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 856 struct net *net = sock_net(skb->sk); 857 struct tipc_net *tn = net_generic(net, tipc_net_id); 858 u32 domain; 859 u32 prio; 860 861 prio = TIPC_MEDIA_LINK_PRI; 862 domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK; 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 rtnl_lock(); 894 err = tipc_enable_bearer(net, bearer, domain, prio, attrs); 895 if (err) { 896 rtnl_unlock(); 897 return err; 898 } 899 rtnl_unlock(); 900 901 return 0; 902 } 903 904 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info) 905 { 906 int err; 907 char *name; 908 struct tipc_bearer *b; 909 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 910 struct net *net = sock_net(skb->sk); 911 912 if (!info->attrs[TIPC_NLA_BEARER]) 913 return -EINVAL; 914 915 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 916 info->attrs[TIPC_NLA_BEARER], 917 tipc_nl_bearer_policy, info->extack); 918 if (err) 919 return err; 920 921 if (!attrs[TIPC_NLA_BEARER_NAME]) 922 return -EINVAL; 923 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 924 925 rtnl_lock(); 926 b = tipc_bearer_find(net, name); 927 if (!b) { 928 rtnl_unlock(); 929 return -EINVAL; 930 } 931 932 #ifdef CONFIG_TIPC_MEDIA_UDP 933 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) { 934 err = tipc_udp_nl_bearer_add(b, 935 attrs[TIPC_NLA_BEARER_UDP_OPTS]); 936 if (err) { 937 rtnl_unlock(); 938 return err; 939 } 940 } 941 #endif 942 rtnl_unlock(); 943 944 return 0; 945 } 946 947 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 948 { 949 int err; 950 char *name; 951 struct tipc_bearer *b; 952 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 953 struct net *net = sock_net(skb->sk); 954 955 if (!info->attrs[TIPC_NLA_BEARER]) 956 return -EINVAL; 957 958 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 959 info->attrs[TIPC_NLA_BEARER], 960 tipc_nl_bearer_policy, info->extack); 961 if (err) 962 return err; 963 964 if (!attrs[TIPC_NLA_BEARER_NAME]) 965 return -EINVAL; 966 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 967 968 rtnl_lock(); 969 b = tipc_bearer_find(net, name); 970 if (!b) { 971 rtnl_unlock(); 972 return -EINVAL; 973 } 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 rtnl_unlock(); 982 return err; 983 } 984 985 if (props[TIPC_NLA_PROP_TOL]) 986 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 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 } 992 rtnl_unlock(); 993 994 return 0; 995 } 996 997 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 998 struct tipc_media *media, int nlflags) 999 { 1000 void *hdr; 1001 struct nlattr *attrs; 1002 struct nlattr *prop; 1003 1004 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 1005 nlflags, TIPC_NL_MEDIA_GET); 1006 if (!hdr) 1007 return -EMSGSIZE; 1008 1009 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 1010 if (!attrs) 1011 goto msg_full; 1012 1013 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 1014 goto attr_msg_full; 1015 1016 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 1017 if (!prop) 1018 goto prop_msg_full; 1019 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 1020 goto prop_msg_full; 1021 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 1022 goto prop_msg_full; 1023 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 1024 goto prop_msg_full; 1025 1026 nla_nest_end(msg->skb, prop); 1027 nla_nest_end(msg->skb, attrs); 1028 genlmsg_end(msg->skb, hdr); 1029 1030 return 0; 1031 1032 prop_msg_full: 1033 nla_nest_cancel(msg->skb, prop); 1034 attr_msg_full: 1035 nla_nest_cancel(msg->skb, attrs); 1036 msg_full: 1037 genlmsg_cancel(msg->skb, hdr); 1038 1039 return -EMSGSIZE; 1040 } 1041 1042 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 1043 { 1044 int err; 1045 int i = cb->args[0]; 1046 struct tipc_nl_msg msg; 1047 1048 if (i == MAX_MEDIA) 1049 return 0; 1050 1051 msg.skb = skb; 1052 msg.portid = NETLINK_CB(cb->skb).portid; 1053 msg.seq = cb->nlh->nlmsg_seq; 1054 1055 rtnl_lock(); 1056 for (; media_info_array[i] != NULL; i++) { 1057 err = __tipc_nl_add_media(&msg, media_info_array[i], 1058 NLM_F_MULTI); 1059 if (err) 1060 break; 1061 } 1062 rtnl_unlock(); 1063 1064 cb->args[0] = i; 1065 return skb->len; 1066 } 1067 1068 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 1069 { 1070 int err; 1071 char *name; 1072 struct tipc_nl_msg msg; 1073 struct tipc_media *media; 1074 struct sk_buff *rep; 1075 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1076 1077 if (!info->attrs[TIPC_NLA_MEDIA]) 1078 return -EINVAL; 1079 1080 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1081 info->attrs[TIPC_NLA_MEDIA], 1082 tipc_nl_media_policy, info->extack); 1083 if (err) 1084 return err; 1085 1086 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1087 return -EINVAL; 1088 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1089 1090 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1091 if (!rep) 1092 return -ENOMEM; 1093 1094 msg.skb = rep; 1095 msg.portid = info->snd_portid; 1096 msg.seq = info->snd_seq; 1097 1098 rtnl_lock(); 1099 media = tipc_media_find(name); 1100 if (!media) { 1101 err = -EINVAL; 1102 goto err_out; 1103 } 1104 1105 err = __tipc_nl_add_media(&msg, media, 0); 1106 if (err) 1107 goto err_out; 1108 rtnl_unlock(); 1109 1110 return genlmsg_reply(rep, info); 1111 err_out: 1112 rtnl_unlock(); 1113 nlmsg_free(rep); 1114 1115 return err; 1116 } 1117 1118 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1119 { 1120 int err; 1121 char *name; 1122 struct tipc_media *m; 1123 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1124 1125 if (!info->attrs[TIPC_NLA_MEDIA]) 1126 return -EINVAL; 1127 1128 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1129 info->attrs[TIPC_NLA_MEDIA], 1130 tipc_nl_media_policy, info->extack); 1131 1132 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1133 return -EINVAL; 1134 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1135 1136 rtnl_lock(); 1137 m = tipc_media_find(name); 1138 if (!m) { 1139 rtnl_unlock(); 1140 return -EINVAL; 1141 } 1142 1143 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1144 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1145 1146 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1147 props); 1148 if (err) { 1149 rtnl_unlock(); 1150 return err; 1151 } 1152 1153 if (props[TIPC_NLA_PROP_TOL]) 1154 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1155 if (props[TIPC_NLA_PROP_PRIO]) 1156 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1157 if (props[TIPC_NLA_PROP_WIN]) 1158 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1159 } 1160 rtnl_unlock(); 1161 1162 return 0; 1163 } 1164