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 return -EINVAL; 328 } 329 330 b->identity = bearer_id; 331 b->tolerance = m->tolerance; 332 b->window = m->window; 333 b->domain = disc_domain; 334 b->net_plane = bearer_id + 'A'; 335 b->priority = priority; 336 test_and_set_bit_lock(0, &b->up); 337 338 res = tipc_disc_create(net, b, &b->bcast_addr, &skb); 339 if (res) { 340 bearer_disable(net, b); 341 pr_warn("Bearer <%s> rejected, discovery object creation failed\n", 342 name); 343 return -EINVAL; 344 } 345 346 rcu_assign_pointer(tn->bearer_list[bearer_id], b); 347 if (skb) 348 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); 349 350 if (tipc_mon_create(net, bearer_id)) 351 return -ENOMEM; 352 353 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", 354 name, 355 tipc_addr_string_fill(addr_string, disc_domain), priority); 356 return res; 357 } 358 359 /** 360 * tipc_reset_bearer - Reset all links established over this bearer 361 */ 362 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) 363 { 364 pr_info("Resetting bearer <%s>\n", b->name); 365 tipc_node_delete_links(net, b->identity); 366 tipc_disc_reset(net, b); 367 return 0; 368 } 369 370 /** 371 * bearer_disable 372 * 373 * Note: This routine assumes caller holds RTNL lock. 374 */ 375 static void bearer_disable(struct net *net, struct tipc_bearer *b) 376 { 377 struct tipc_net *tn = tipc_net(net); 378 int bearer_id = b->identity; 379 380 pr_info("Disabling bearer <%s>\n", b->name); 381 clear_bit_unlock(0, &b->up); 382 tipc_node_delete_links(net, bearer_id); 383 b->media->disable_media(b); 384 RCU_INIT_POINTER(b->media_ptr, NULL); 385 if (b->link_req) 386 tipc_disc_delete(b->link_req); 387 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); 388 kfree_rcu(b, rcu); 389 tipc_mon_delete(net, bearer_id); 390 } 391 392 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 393 struct nlattr *attr[]) 394 { 395 struct net_device *dev; 396 char *driver_name = strchr((const char *)b->name, ':') + 1; 397 398 /* Find device with specified name */ 399 dev = dev_get_by_name(net, driver_name); 400 if (!dev) 401 return -ENODEV; 402 if (tipc_mtu_bad(dev, 0)) { 403 dev_put(dev); 404 return -EINVAL; 405 } 406 407 /* Associate TIPC bearer with L2 bearer */ 408 rcu_assign_pointer(b->media_ptr, dev); 409 b->pt.dev = dev; 410 b->pt.type = htons(ETH_P_TIPC); 411 b->pt.func = tipc_l2_rcv_msg; 412 dev_add_pack(&b->pt); 413 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 414 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); 415 b->bcast_addr.media_id = b->media->type_id; 416 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 417 b->mtu = dev->mtu; 418 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 419 rcu_assign_pointer(dev->tipc_ptr, b); 420 return 0; 421 } 422 423 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 424 * 425 * Mark L2 bearer as inactive so that incoming buffers are thrown away 426 */ 427 void tipc_disable_l2_media(struct tipc_bearer *b) 428 { 429 struct net_device *dev; 430 431 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 432 dev_remove_pack(&b->pt); 433 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 434 synchronize_net(); 435 dev_put(dev); 436 } 437 438 /** 439 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 440 * @skb: the packet to be sent 441 * @b: the bearer through which the packet is to be sent 442 * @dest: peer destination address 443 */ 444 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, 445 struct tipc_bearer *b, struct tipc_media_addr *dest) 446 { 447 struct net_device *dev; 448 int delta; 449 450 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 451 if (!dev) 452 return 0; 453 454 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); 455 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) { 456 kfree_skb(skb); 457 return 0; 458 } 459 skb_reset_network_header(skb); 460 skb->dev = dev; 461 skb->protocol = htons(ETH_P_TIPC); 462 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, 463 dev->dev_addr, skb->len); 464 dev_queue_xmit(skb); 465 return 0; 466 } 467 468 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id) 469 { 470 bool supp = false; 471 struct tipc_bearer *b; 472 473 rcu_read_lock(); 474 b = bearer_get(net, bearer_id); 475 if (b) 476 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT); 477 rcu_read_unlock(); 478 return supp; 479 } 480 481 int tipc_bearer_mtu(struct net *net, u32 bearer_id) 482 { 483 int mtu = 0; 484 struct tipc_bearer *b; 485 486 rcu_read_lock(); 487 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]); 488 if (b) 489 mtu = b->mtu; 490 rcu_read_unlock(); 491 return mtu; 492 } 493 494 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer 495 */ 496 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, 497 struct sk_buff *skb, 498 struct tipc_media_addr *dest) 499 { 500 struct tipc_msg *hdr = buf_msg(skb); 501 struct tipc_bearer *b; 502 503 rcu_read_lock(); 504 b = bearer_get(net, bearer_id); 505 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) 506 b->media->send_msg(net, skb, b, dest); 507 else 508 kfree_skb(skb); 509 rcu_read_unlock(); 510 } 511 512 /* tipc_bearer_xmit() -send buffer to destination over bearer 513 */ 514 void tipc_bearer_xmit(struct net *net, u32 bearer_id, 515 struct sk_buff_head *xmitq, 516 struct tipc_media_addr *dst) 517 { 518 struct tipc_bearer *b; 519 struct sk_buff *skb, *tmp; 520 521 if (skb_queue_empty(xmitq)) 522 return; 523 524 rcu_read_lock(); 525 b = bearer_get(net, bearer_id); 526 if (unlikely(!b)) 527 __skb_queue_purge(xmitq); 528 skb_queue_walk_safe(xmitq, skb, tmp) { 529 __skb_dequeue(xmitq); 530 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) 531 b->media->send_msg(net, skb, b, dst); 532 else 533 kfree_skb(skb); 534 } 535 rcu_read_unlock(); 536 } 537 538 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations 539 */ 540 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 541 struct sk_buff_head *xmitq) 542 { 543 struct tipc_net *tn = tipc_net(net); 544 int net_id = tn->net_id; 545 struct tipc_bearer *b; 546 struct sk_buff *skb, *tmp; 547 struct tipc_msg *hdr; 548 549 rcu_read_lock(); 550 b = bearer_get(net, bearer_id); 551 if (unlikely(!b || !test_bit(0, &b->up))) 552 __skb_queue_purge(xmitq); 553 skb_queue_walk_safe(xmitq, skb, tmp) { 554 hdr = buf_msg(skb); 555 msg_set_non_seq(hdr, 1); 556 msg_set_mc_netid(hdr, net_id); 557 __skb_dequeue(xmitq); 558 b->media->send_msg(net, skb, b, &b->bcast_addr); 559 } 560 rcu_read_unlock(); 561 } 562 563 /** 564 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 565 * @buf: the received packet 566 * @dev: the net device that the packet was received on 567 * @pt: the packet_type structure which was used to register this handler 568 * @orig_dev: the original receive net device in case the device is a bond 569 * 570 * Accept only packets explicitly sent to this node, or broadcast packets; 571 * ignores packets sent using interface multicast, and traffic sent to other 572 * nodes (which can happen if interface is running in promiscuous mode). 573 */ 574 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, 575 struct packet_type *pt, struct net_device *orig_dev) 576 { 577 struct tipc_bearer *b; 578 579 rcu_read_lock(); 580 b = rcu_dereference_rtnl(dev->tipc_ptr) ?: 581 rcu_dereference_rtnl(orig_dev->tipc_ptr); 582 if (likely(b && test_bit(0, &b->up) && 583 (skb->pkt_type <= PACKET_MULTICAST))) { 584 skb->next = NULL; 585 tipc_rcv(dev_net(b->pt.dev), skb, b); 586 rcu_read_unlock(); 587 return NET_RX_SUCCESS; 588 } 589 rcu_read_unlock(); 590 kfree_skb(skb); 591 return NET_RX_DROP; 592 } 593 594 /** 595 * tipc_l2_device_event - handle device events from network device 596 * @nb: the context of the notification 597 * @evt: the type of event 598 * @ptr: the net device that the event was on 599 * 600 * This function is called by the Ethernet driver in case of link 601 * change event. 602 */ 603 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 604 void *ptr) 605 { 606 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 607 struct net *net = dev_net(dev); 608 struct tipc_bearer *b; 609 610 b = rtnl_dereference(dev->tipc_ptr); 611 if (!b) 612 return NOTIFY_DONE; 613 614 switch (evt) { 615 case NETDEV_CHANGE: 616 if (netif_carrier_ok(dev)) 617 break; 618 case NETDEV_UP: 619 test_and_set_bit_lock(0, &b->up); 620 break; 621 case NETDEV_GOING_DOWN: 622 clear_bit_unlock(0, &b->up); 623 tipc_reset_bearer(net, b); 624 break; 625 case NETDEV_CHANGEMTU: 626 if (tipc_mtu_bad(dev, 0)) { 627 bearer_disable(net, b); 628 break; 629 } 630 b->mtu = dev->mtu; 631 tipc_reset_bearer(net, b); 632 break; 633 case NETDEV_CHANGEADDR: 634 b->media->raw2addr(b, &b->addr, 635 (char *)dev->dev_addr); 636 tipc_reset_bearer(net, b); 637 break; 638 case NETDEV_UNREGISTER: 639 case NETDEV_CHANGENAME: 640 bearer_disable(net, b); 641 break; 642 } 643 return NOTIFY_OK; 644 } 645 646 static struct notifier_block notifier = { 647 .notifier_call = tipc_l2_device_event, 648 .priority = 0, 649 }; 650 651 int tipc_bearer_setup(void) 652 { 653 return register_netdevice_notifier(¬ifier); 654 } 655 656 void tipc_bearer_cleanup(void) 657 { 658 unregister_netdevice_notifier(¬ifier); 659 } 660 661 void tipc_bearer_stop(struct net *net) 662 { 663 struct tipc_net *tn = net_generic(net, tipc_net_id); 664 struct tipc_bearer *b; 665 u32 i; 666 667 for (i = 0; i < MAX_BEARERS; i++) { 668 b = rtnl_dereference(tn->bearer_list[i]); 669 if (b) { 670 bearer_disable(net, b); 671 tn->bearer_list[i] = NULL; 672 } 673 } 674 } 675 676 /* Caller should hold rtnl_lock to protect the bearer */ 677 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 678 struct tipc_bearer *bearer, int nlflags) 679 { 680 void *hdr; 681 struct nlattr *attrs; 682 struct nlattr *prop; 683 684 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 685 nlflags, TIPC_NL_BEARER_GET); 686 if (!hdr) 687 return -EMSGSIZE; 688 689 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 690 if (!attrs) 691 goto msg_full; 692 693 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 694 goto attr_msg_full; 695 696 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 697 if (!prop) 698 goto prop_msg_full; 699 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 700 goto prop_msg_full; 701 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 702 goto prop_msg_full; 703 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 704 goto prop_msg_full; 705 706 nla_nest_end(msg->skb, prop); 707 708 #ifdef CONFIG_TIPC_MEDIA_UDP 709 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) { 710 if (tipc_udp_nl_add_bearer_data(msg, bearer)) 711 goto attr_msg_full; 712 } 713 #endif 714 715 nla_nest_end(msg->skb, attrs); 716 genlmsg_end(msg->skb, hdr); 717 718 return 0; 719 720 prop_msg_full: 721 nla_nest_cancel(msg->skb, prop); 722 attr_msg_full: 723 nla_nest_cancel(msg->skb, attrs); 724 msg_full: 725 genlmsg_cancel(msg->skb, hdr); 726 727 return -EMSGSIZE; 728 } 729 730 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 731 { 732 int err; 733 int i = cb->args[0]; 734 struct tipc_bearer *bearer; 735 struct tipc_nl_msg msg; 736 struct net *net = sock_net(skb->sk); 737 struct tipc_net *tn = net_generic(net, tipc_net_id); 738 739 if (i == MAX_BEARERS) 740 return 0; 741 742 msg.skb = skb; 743 msg.portid = NETLINK_CB(cb->skb).portid; 744 msg.seq = cb->nlh->nlmsg_seq; 745 746 rtnl_lock(); 747 for (i = 0; i < MAX_BEARERS; i++) { 748 bearer = rtnl_dereference(tn->bearer_list[i]); 749 if (!bearer) 750 continue; 751 752 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 753 if (err) 754 break; 755 } 756 rtnl_unlock(); 757 758 cb->args[0] = i; 759 return skb->len; 760 } 761 762 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 763 { 764 int err; 765 char *name; 766 struct sk_buff *rep; 767 struct tipc_bearer *bearer; 768 struct tipc_nl_msg msg; 769 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 770 struct net *net = genl_info_net(info); 771 772 if (!info->attrs[TIPC_NLA_BEARER]) 773 return -EINVAL; 774 775 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 776 info->attrs[TIPC_NLA_BEARER], 777 tipc_nl_bearer_policy, info->extack); 778 if (err) 779 return err; 780 781 if (!attrs[TIPC_NLA_BEARER_NAME]) 782 return -EINVAL; 783 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 784 785 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 786 if (!rep) 787 return -ENOMEM; 788 789 msg.skb = rep; 790 msg.portid = info->snd_portid; 791 msg.seq = info->snd_seq; 792 793 rtnl_lock(); 794 bearer = tipc_bearer_find(net, name); 795 if (!bearer) { 796 err = -EINVAL; 797 goto err_out; 798 } 799 800 err = __tipc_nl_add_bearer(&msg, bearer, 0); 801 if (err) 802 goto err_out; 803 rtnl_unlock(); 804 805 return genlmsg_reply(rep, info); 806 err_out: 807 rtnl_unlock(); 808 nlmsg_free(rep); 809 810 return err; 811 } 812 813 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 814 { 815 int err; 816 char *name; 817 struct tipc_bearer *bearer; 818 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 819 struct net *net = sock_net(skb->sk); 820 821 if (!info->attrs[TIPC_NLA_BEARER]) 822 return -EINVAL; 823 824 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 825 info->attrs[TIPC_NLA_BEARER], 826 tipc_nl_bearer_policy, info->extack); 827 if (err) 828 return err; 829 830 if (!attrs[TIPC_NLA_BEARER_NAME]) 831 return -EINVAL; 832 833 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 834 835 rtnl_lock(); 836 bearer = tipc_bearer_find(net, name); 837 if (!bearer) { 838 rtnl_unlock(); 839 return -EINVAL; 840 } 841 842 bearer_disable(net, bearer); 843 rtnl_unlock(); 844 845 return 0; 846 } 847 848 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 849 { 850 int err; 851 char *bearer; 852 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 853 struct net *net = sock_net(skb->sk); 854 struct tipc_net *tn = net_generic(net, tipc_net_id); 855 u32 domain; 856 u32 prio; 857 858 prio = TIPC_MEDIA_LINK_PRI; 859 domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK; 860 861 if (!info->attrs[TIPC_NLA_BEARER]) 862 return -EINVAL; 863 864 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 865 info->attrs[TIPC_NLA_BEARER], 866 tipc_nl_bearer_policy, info->extack); 867 if (err) 868 return err; 869 870 if (!attrs[TIPC_NLA_BEARER_NAME]) 871 return -EINVAL; 872 873 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 874 875 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 876 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 877 878 if (attrs[TIPC_NLA_BEARER_PROP]) { 879 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 880 881 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 882 props); 883 if (err) 884 return err; 885 886 if (props[TIPC_NLA_PROP_PRIO]) 887 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 888 } 889 890 rtnl_lock(); 891 err = tipc_enable_bearer(net, bearer, domain, prio, attrs); 892 if (err) { 893 rtnl_unlock(); 894 return err; 895 } 896 rtnl_unlock(); 897 898 return 0; 899 } 900 901 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info) 902 { 903 int err; 904 char *name; 905 struct tipc_bearer *b; 906 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 907 struct net *net = sock_net(skb->sk); 908 909 if (!info->attrs[TIPC_NLA_BEARER]) 910 return -EINVAL; 911 912 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 913 info->attrs[TIPC_NLA_BEARER], 914 tipc_nl_bearer_policy, info->extack); 915 if (err) 916 return err; 917 918 if (!attrs[TIPC_NLA_BEARER_NAME]) 919 return -EINVAL; 920 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 921 922 rtnl_lock(); 923 b = tipc_bearer_find(net, name); 924 if (!b) { 925 rtnl_unlock(); 926 return -EINVAL; 927 } 928 929 #ifdef CONFIG_TIPC_MEDIA_UDP 930 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) { 931 err = tipc_udp_nl_bearer_add(b, 932 attrs[TIPC_NLA_BEARER_UDP_OPTS]); 933 if (err) { 934 rtnl_unlock(); 935 return err; 936 } 937 } 938 #endif 939 rtnl_unlock(); 940 941 return 0; 942 } 943 944 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 945 { 946 int err; 947 char *name; 948 struct tipc_bearer *b; 949 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 950 struct net *net = sock_net(skb->sk); 951 952 if (!info->attrs[TIPC_NLA_BEARER]) 953 return -EINVAL; 954 955 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 956 info->attrs[TIPC_NLA_BEARER], 957 tipc_nl_bearer_policy, info->extack); 958 if (err) 959 return err; 960 961 if (!attrs[TIPC_NLA_BEARER_NAME]) 962 return -EINVAL; 963 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 964 965 rtnl_lock(); 966 b = tipc_bearer_find(net, name); 967 if (!b) { 968 rtnl_unlock(); 969 return -EINVAL; 970 } 971 972 if (attrs[TIPC_NLA_BEARER_PROP]) { 973 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 974 975 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 976 props); 977 if (err) { 978 rtnl_unlock(); 979 return err; 980 } 981 982 if (props[TIPC_NLA_PROP_TOL]) 983 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 984 if (props[TIPC_NLA_PROP_PRIO]) 985 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 986 if (props[TIPC_NLA_PROP_WIN]) 987 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 988 } 989 rtnl_unlock(); 990 991 return 0; 992 } 993 994 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 995 struct tipc_media *media, int nlflags) 996 { 997 void *hdr; 998 struct nlattr *attrs; 999 struct nlattr *prop; 1000 1001 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 1002 nlflags, TIPC_NL_MEDIA_GET); 1003 if (!hdr) 1004 return -EMSGSIZE; 1005 1006 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 1007 if (!attrs) 1008 goto msg_full; 1009 1010 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 1011 goto attr_msg_full; 1012 1013 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 1014 if (!prop) 1015 goto prop_msg_full; 1016 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 1017 goto prop_msg_full; 1018 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 1019 goto prop_msg_full; 1020 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 1021 goto prop_msg_full; 1022 1023 nla_nest_end(msg->skb, prop); 1024 nla_nest_end(msg->skb, attrs); 1025 genlmsg_end(msg->skb, hdr); 1026 1027 return 0; 1028 1029 prop_msg_full: 1030 nla_nest_cancel(msg->skb, prop); 1031 attr_msg_full: 1032 nla_nest_cancel(msg->skb, attrs); 1033 msg_full: 1034 genlmsg_cancel(msg->skb, hdr); 1035 1036 return -EMSGSIZE; 1037 } 1038 1039 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 1040 { 1041 int err; 1042 int i = cb->args[0]; 1043 struct tipc_nl_msg msg; 1044 1045 if (i == MAX_MEDIA) 1046 return 0; 1047 1048 msg.skb = skb; 1049 msg.portid = NETLINK_CB(cb->skb).portid; 1050 msg.seq = cb->nlh->nlmsg_seq; 1051 1052 rtnl_lock(); 1053 for (; media_info_array[i] != NULL; i++) { 1054 err = __tipc_nl_add_media(&msg, media_info_array[i], 1055 NLM_F_MULTI); 1056 if (err) 1057 break; 1058 } 1059 rtnl_unlock(); 1060 1061 cb->args[0] = i; 1062 return skb->len; 1063 } 1064 1065 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 1066 { 1067 int err; 1068 char *name; 1069 struct tipc_nl_msg msg; 1070 struct tipc_media *media; 1071 struct sk_buff *rep; 1072 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1073 1074 if (!info->attrs[TIPC_NLA_MEDIA]) 1075 return -EINVAL; 1076 1077 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1078 info->attrs[TIPC_NLA_MEDIA], 1079 tipc_nl_media_policy, info->extack); 1080 if (err) 1081 return err; 1082 1083 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1084 return -EINVAL; 1085 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1086 1087 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1088 if (!rep) 1089 return -ENOMEM; 1090 1091 msg.skb = rep; 1092 msg.portid = info->snd_portid; 1093 msg.seq = info->snd_seq; 1094 1095 rtnl_lock(); 1096 media = tipc_media_find(name); 1097 if (!media) { 1098 err = -EINVAL; 1099 goto err_out; 1100 } 1101 1102 err = __tipc_nl_add_media(&msg, media, 0); 1103 if (err) 1104 goto err_out; 1105 rtnl_unlock(); 1106 1107 return genlmsg_reply(rep, info); 1108 err_out: 1109 rtnl_unlock(); 1110 nlmsg_free(rep); 1111 1112 return err; 1113 } 1114 1115 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1116 { 1117 int err; 1118 char *name; 1119 struct tipc_media *m; 1120 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1121 1122 if (!info->attrs[TIPC_NLA_MEDIA]) 1123 return -EINVAL; 1124 1125 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1126 info->attrs[TIPC_NLA_MEDIA], 1127 tipc_nl_media_policy, info->extack); 1128 1129 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1130 return -EINVAL; 1131 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1132 1133 rtnl_lock(); 1134 m = tipc_media_find(name); 1135 if (!m) { 1136 rtnl_unlock(); 1137 return -EINVAL; 1138 } 1139 1140 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1141 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1142 1143 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1144 props); 1145 if (err) { 1146 rtnl_unlock(); 1147 return err; 1148 } 1149 1150 if (props[TIPC_NLA_PROP_TOL]) 1151 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1152 if (props[TIPC_NLA_PROP_PRIO]) 1153 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1154 if (props[TIPC_NLA_PROP_WIN]) 1155 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1156 } 1157 rtnl_unlock(); 1158 1159 return 0; 1160 } 1161