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 69 /** 70 * tipc_media_find - locates specified media object by name 71 */ 72 struct tipc_media *tipc_media_find(const char *name) 73 { 74 u32 i; 75 76 for (i = 0; media_info_array[i] != NULL; i++) { 77 if (!strcmp(media_info_array[i]->name, name)) 78 break; 79 } 80 return media_info_array[i]; 81 } 82 83 /** 84 * media_find_id - locates specified media object by type identifier 85 */ 86 static struct tipc_media *media_find_id(u8 type) 87 { 88 u32 i; 89 90 for (i = 0; media_info_array[i] != NULL; i++) { 91 if (media_info_array[i]->type_id == type) 92 break; 93 } 94 return media_info_array[i]; 95 } 96 97 /** 98 * tipc_media_addr_printf - record media address in print buffer 99 */ 100 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) 101 { 102 char addr_str[MAX_ADDR_STR]; 103 struct tipc_media *m; 104 int ret; 105 106 m = media_find_id(a->media_id); 107 108 if (m && !m->addr2str(a, addr_str, sizeof(addr_str))) 109 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str); 110 else { 111 u32 i; 112 113 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); 114 for (i = 0; i < sizeof(a->value); i++) 115 ret += scnprintf(buf - ret, len + ret, 116 "-%02x", a->value[i]); 117 } 118 } 119 120 /** 121 * bearer_name_validate - validate & (optionally) deconstruct bearer name 122 * @name: ptr to bearer name string 123 * @name_parts: ptr to area for bearer name components (or NULL if not needed) 124 * 125 * Returns 1 if bearer name is valid, otherwise 0. 126 */ 127 static int bearer_name_validate(const char *name, 128 struct tipc_bearer_names *name_parts) 129 { 130 char name_copy[TIPC_MAX_BEARER_NAME]; 131 char *media_name; 132 char *if_name; 133 u32 media_len; 134 u32 if_len; 135 136 /* copy bearer name & ensure length is OK */ 137 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; 138 /* need above in case non-Posix strncpy() doesn't pad with nulls */ 139 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); 140 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) 141 return 0; 142 143 /* ensure all component parts of bearer name are present */ 144 media_name = name_copy; 145 if_name = strchr(media_name, ':'); 146 if (if_name == NULL) 147 return 0; 148 *(if_name++) = 0; 149 media_len = if_name - media_name; 150 if_len = strlen(if_name) + 1; 151 152 /* validate component parts of bearer name */ 153 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || 154 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) 155 return 0; 156 157 /* return bearer name components, if necessary */ 158 if (name_parts) { 159 strcpy(name_parts->media_name, media_name); 160 strcpy(name_parts->if_name, if_name); 161 } 162 return 1; 163 } 164 165 /** 166 * tipc_bearer_find - locates bearer object with matching bearer name 167 */ 168 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) 169 { 170 struct tipc_net *tn = net_generic(net, tipc_net_id); 171 struct tipc_bearer *b; 172 u32 i; 173 174 for (i = 0; i < MAX_BEARERS; i++) { 175 b = rtnl_dereference(tn->bearer_list[i]); 176 if (b && (!strcmp(b->name, name))) 177 return b; 178 } 179 return NULL; 180 } 181 182 /* tipc_bearer_get_name - get the bearer name from its id. 183 * @net: network namespace 184 * @name: a pointer to the buffer where the name will be stored. 185 * @bearer_id: the id to get the name from. 186 */ 187 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id) 188 { 189 struct tipc_net *tn = tipc_net(net); 190 struct tipc_bearer *b; 191 192 if (bearer_id >= MAX_BEARERS) 193 return -EINVAL; 194 195 b = rtnl_dereference(tn->bearer_list[bearer_id]); 196 if (!b) 197 return -EINVAL; 198 199 strcpy(name, b->name); 200 return 0; 201 } 202 203 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) 204 { 205 struct tipc_net *tn = net_generic(net, tipc_net_id); 206 struct tipc_bearer *b; 207 208 rcu_read_lock(); 209 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 210 if (b) 211 tipc_disc_add_dest(b->link_req); 212 rcu_read_unlock(); 213 } 214 215 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) 216 { 217 struct tipc_net *tn = net_generic(net, tipc_net_id); 218 struct tipc_bearer *b; 219 220 rcu_read_lock(); 221 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 222 if (b) 223 tipc_disc_remove_dest(b->link_req); 224 rcu_read_unlock(); 225 } 226 227 /** 228 * tipc_enable_bearer - enable bearer with the given name 229 */ 230 static int tipc_enable_bearer(struct net *net, const char *name, 231 u32 disc_domain, u32 priority, 232 struct nlattr *attr[]) 233 { 234 struct tipc_net *tn = net_generic(net, tipc_net_id); 235 struct tipc_bearer *b; 236 struct tipc_media *m; 237 struct tipc_bearer_names b_names; 238 struct sk_buff *skb; 239 char addr_string[16]; 240 u32 bearer_id; 241 u32 with_this_prio; 242 u32 i; 243 int res = -EINVAL; 244 245 if (!tn->own_addr) { 246 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", 247 name); 248 return -ENOPROTOOPT; 249 } 250 if (!bearer_name_validate(name, &b_names)) { 251 pr_warn("Bearer <%s> rejected, illegal name\n", name); 252 return -EINVAL; 253 } 254 if (tipc_addr_domain_valid(disc_domain) && 255 (disc_domain != tn->own_addr)) { 256 if (tipc_in_scope(disc_domain, tn->own_addr)) { 257 disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK; 258 res = 0; /* accept any node in own cluster */ 259 } else if (in_own_cluster_exact(net, disc_domain)) 260 res = 0; /* accept specified node in own cluster */ 261 } 262 if (res) { 263 pr_warn("Bearer <%s> rejected, illegal discovery domain\n", 264 name); 265 return -EINVAL; 266 } 267 if ((priority > TIPC_MAX_LINK_PRI) && 268 (priority != TIPC_MEDIA_LINK_PRI)) { 269 pr_warn("Bearer <%s> rejected, illegal priority\n", name); 270 return -EINVAL; 271 } 272 273 m = tipc_media_find(b_names.media_name); 274 if (!m) { 275 pr_warn("Bearer <%s> rejected, media <%s> not registered\n", 276 name, b_names.media_name); 277 return -EINVAL; 278 } 279 280 if (priority == TIPC_MEDIA_LINK_PRI) 281 priority = m->priority; 282 283 restart: 284 bearer_id = MAX_BEARERS; 285 with_this_prio = 1; 286 for (i = MAX_BEARERS; i-- != 0; ) { 287 b = rtnl_dereference(tn->bearer_list[i]); 288 if (!b) { 289 bearer_id = i; 290 continue; 291 } 292 if (!strcmp(name, b->name)) { 293 pr_warn("Bearer <%s> rejected, already enabled\n", 294 name); 295 return -EINVAL; 296 } 297 if ((b->priority == priority) && 298 (++with_this_prio > 2)) { 299 if (priority-- == 0) { 300 pr_warn("Bearer <%s> rejected, duplicate priority\n", 301 name); 302 return -EINVAL; 303 } 304 pr_warn("Bearer <%s> priority adjustment required %u->%u\n", 305 name, priority + 1, priority); 306 goto restart; 307 } 308 } 309 if (bearer_id >= MAX_BEARERS) { 310 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", 311 name, MAX_BEARERS); 312 return -EINVAL; 313 } 314 315 b = kzalloc(sizeof(*b), GFP_ATOMIC); 316 if (!b) 317 return -ENOMEM; 318 319 strcpy(b->name, name); 320 b->media = m; 321 res = m->enable_media(net, b, attr); 322 if (res) { 323 pr_warn("Bearer <%s> rejected, enable failure (%d)\n", 324 name, -res); 325 return -EINVAL; 326 } 327 328 b->identity = bearer_id; 329 b->tolerance = m->tolerance; 330 b->window = m->window; 331 b->domain = disc_domain; 332 b->net_plane = bearer_id + 'A'; 333 b->priority = priority; 334 test_and_set_bit_lock(0, &b->up); 335 336 res = tipc_disc_create(net, b, &b->bcast_addr, &skb); 337 if (res) { 338 bearer_disable(net, b); 339 pr_warn("Bearer <%s> rejected, discovery object creation failed\n", 340 name); 341 return -EINVAL; 342 } 343 344 rcu_assign_pointer(tn->bearer_list[bearer_id], b); 345 if (skb) 346 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); 347 348 if (tipc_mon_create(net, bearer_id)) 349 return -ENOMEM; 350 351 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", 352 name, 353 tipc_addr_string_fill(addr_string, disc_domain), priority); 354 return res; 355 } 356 357 /** 358 * tipc_reset_bearer - Reset all links established over this bearer 359 */ 360 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) 361 { 362 pr_info("Resetting bearer <%s>\n", b->name); 363 tipc_node_delete_links(net, b->identity); 364 tipc_disc_reset(net, b); 365 return 0; 366 } 367 368 /* tipc_bearer_reset_all - reset all links on all bearers 369 */ 370 void tipc_bearer_reset_all(struct net *net) 371 { 372 struct tipc_bearer *b; 373 int i; 374 375 for (i = 0; i < MAX_BEARERS; i++) { 376 b = bearer_get(net, i); 377 if (b) 378 clear_bit_unlock(0, &b->up); 379 } 380 for (i = 0; i < MAX_BEARERS; i++) { 381 b = bearer_get(net, i); 382 if (b) 383 tipc_reset_bearer(net, b); 384 } 385 for (i = 0; i < MAX_BEARERS; i++) { 386 b = bearer_get(net, i); 387 if (b) 388 test_and_set_bit_lock(0, &b->up); 389 } 390 } 391 392 /** 393 * bearer_disable 394 * 395 * Note: This routine assumes caller holds RTNL lock. 396 */ 397 static void bearer_disable(struct net *net, struct tipc_bearer *b) 398 { 399 struct tipc_net *tn = tipc_net(net); 400 int bearer_id = b->identity; 401 402 pr_info("Disabling bearer <%s>\n", b->name); 403 clear_bit_unlock(0, &b->up); 404 tipc_node_delete_links(net, bearer_id); 405 b->media->disable_media(b); 406 RCU_INIT_POINTER(b->media_ptr, NULL); 407 if (b->link_req) 408 tipc_disc_delete(b->link_req); 409 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); 410 kfree_rcu(b, rcu); 411 tipc_mon_delete(net, bearer_id); 412 } 413 414 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 415 struct nlattr *attr[]) 416 { 417 struct net_device *dev; 418 char *driver_name = strchr((const char *)b->name, ':') + 1; 419 420 /* Find device with specified name */ 421 dev = dev_get_by_name(net, driver_name); 422 if (!dev) 423 return -ENODEV; 424 425 /* Associate TIPC bearer with L2 bearer */ 426 rcu_assign_pointer(b->media_ptr, dev); 427 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 428 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); 429 b->bcast_addr.media_id = b->media->type_id; 430 b->bcast_addr.broadcast = 1; 431 b->mtu = dev->mtu; 432 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 433 rcu_assign_pointer(dev->tipc_ptr, b); 434 return 0; 435 } 436 437 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 438 * 439 * Mark L2 bearer as inactive so that incoming buffers are thrown away 440 */ 441 void tipc_disable_l2_media(struct tipc_bearer *b) 442 { 443 struct net_device *dev; 444 445 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 446 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 447 synchronize_net(); 448 dev_put(dev); 449 } 450 451 /** 452 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 453 * @skb: the packet to be sent 454 * @b: the bearer through which the packet is to be sent 455 * @dest: peer destination address 456 */ 457 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, 458 struct tipc_bearer *b, struct tipc_media_addr *dest) 459 { 460 struct net_device *dev; 461 int delta; 462 463 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 464 if (!dev) 465 return 0; 466 467 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); 468 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) { 469 kfree_skb(skb); 470 return 0; 471 } 472 skb_reset_network_header(skb); 473 skb->dev = dev; 474 skb->protocol = htons(ETH_P_TIPC); 475 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, 476 dev->dev_addr, skb->len); 477 dev_queue_xmit(skb); 478 return 0; 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 if (likely(b && test_bit(0, &b->up) && 582 (skb->pkt_type <= PACKET_BROADCAST))) { 583 skb->next = NULL; 584 tipc_rcv(dev_net(dev), skb, b); 585 rcu_read_unlock(); 586 return NET_RX_SUCCESS; 587 } 588 rcu_read_unlock(); 589 kfree_skb(skb); 590 return NET_RX_DROP; 591 } 592 593 /** 594 * tipc_l2_device_event - handle device events from network device 595 * @nb: the context of the notification 596 * @evt: the type of event 597 * @ptr: the net device that the event was on 598 * 599 * This function is called by the Ethernet driver in case of link 600 * change event. 601 */ 602 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 603 void *ptr) 604 { 605 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 606 struct net *net = dev_net(dev); 607 struct tipc_bearer *b; 608 609 b = rtnl_dereference(dev->tipc_ptr); 610 if (!b) 611 return NOTIFY_DONE; 612 613 b->mtu = dev->mtu; 614 615 switch (evt) { 616 case NETDEV_CHANGE: 617 if (netif_carrier_ok(dev)) 618 break; 619 case NETDEV_UP: 620 test_and_set_bit_lock(0, &b->up); 621 break; 622 case NETDEV_GOING_DOWN: 623 clear_bit_unlock(0, &b->up); 624 tipc_reset_bearer(net, b); 625 break; 626 case NETDEV_CHANGEMTU: 627 tipc_reset_bearer(net, b); 628 break; 629 case NETDEV_CHANGEADDR: 630 b->media->raw2addr(b, &b->addr, 631 (char *)dev->dev_addr); 632 tipc_reset_bearer(net, b); 633 break; 634 case NETDEV_UNREGISTER: 635 case NETDEV_CHANGENAME: 636 bearer_disable(dev_net(dev), b); 637 break; 638 } 639 return NOTIFY_OK; 640 } 641 642 static struct packet_type tipc_packet_type __read_mostly = { 643 .type = htons(ETH_P_TIPC), 644 .func = tipc_l2_rcv_msg, 645 }; 646 647 static struct notifier_block notifier = { 648 .notifier_call = tipc_l2_device_event, 649 .priority = 0, 650 }; 651 652 int tipc_bearer_setup(void) 653 { 654 int err; 655 656 err = register_netdevice_notifier(¬ifier); 657 if (err) 658 return err; 659 dev_add_pack(&tipc_packet_type); 660 return 0; 661 } 662 663 void tipc_bearer_cleanup(void) 664 { 665 unregister_netdevice_notifier(¬ifier); 666 dev_remove_pack(&tipc_packet_type); 667 } 668 669 void tipc_bearer_stop(struct net *net) 670 { 671 struct tipc_net *tn = net_generic(net, tipc_net_id); 672 struct tipc_bearer *b; 673 u32 i; 674 675 for (i = 0; i < MAX_BEARERS; i++) { 676 b = rtnl_dereference(tn->bearer_list[i]); 677 if (b) { 678 bearer_disable(net, b); 679 tn->bearer_list[i] = NULL; 680 } 681 } 682 } 683 684 /* Caller should hold rtnl_lock to protect the bearer */ 685 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 686 struct tipc_bearer *bearer, int nlflags) 687 { 688 void *hdr; 689 struct nlattr *attrs; 690 struct nlattr *prop; 691 692 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 693 nlflags, TIPC_NL_BEARER_GET); 694 if (!hdr) 695 return -EMSGSIZE; 696 697 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 698 if (!attrs) 699 goto msg_full; 700 701 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 702 goto attr_msg_full; 703 704 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 705 if (!prop) 706 goto prop_msg_full; 707 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 708 goto prop_msg_full; 709 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 710 goto prop_msg_full; 711 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 712 goto prop_msg_full; 713 714 nla_nest_end(msg->skb, prop); 715 716 #ifdef CONFIG_TIPC_MEDIA_UDP 717 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) { 718 if (tipc_udp_nl_add_bearer_data(msg, bearer)) 719 goto attr_msg_full; 720 } 721 #endif 722 723 nla_nest_end(msg->skb, attrs); 724 genlmsg_end(msg->skb, hdr); 725 726 return 0; 727 728 prop_msg_full: 729 nla_nest_cancel(msg->skb, prop); 730 attr_msg_full: 731 nla_nest_cancel(msg->skb, attrs); 732 msg_full: 733 genlmsg_cancel(msg->skb, hdr); 734 735 return -EMSGSIZE; 736 } 737 738 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 739 { 740 int err; 741 int i = cb->args[0]; 742 struct tipc_bearer *bearer; 743 struct tipc_nl_msg msg; 744 struct net *net = sock_net(skb->sk); 745 struct tipc_net *tn = net_generic(net, tipc_net_id); 746 747 if (i == MAX_BEARERS) 748 return 0; 749 750 msg.skb = skb; 751 msg.portid = NETLINK_CB(cb->skb).portid; 752 msg.seq = cb->nlh->nlmsg_seq; 753 754 rtnl_lock(); 755 for (i = 0; i < MAX_BEARERS; i++) { 756 bearer = rtnl_dereference(tn->bearer_list[i]); 757 if (!bearer) 758 continue; 759 760 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 761 if (err) 762 break; 763 } 764 rtnl_unlock(); 765 766 cb->args[0] = i; 767 return skb->len; 768 } 769 770 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 771 { 772 int err; 773 char *name; 774 struct sk_buff *rep; 775 struct tipc_bearer *bearer; 776 struct tipc_nl_msg msg; 777 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 778 struct net *net = genl_info_net(info); 779 780 if (!info->attrs[TIPC_NLA_BEARER]) 781 return -EINVAL; 782 783 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 784 info->attrs[TIPC_NLA_BEARER], 785 tipc_nl_bearer_policy); 786 if (err) 787 return err; 788 789 if (!attrs[TIPC_NLA_BEARER_NAME]) 790 return -EINVAL; 791 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 792 793 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 794 if (!rep) 795 return -ENOMEM; 796 797 msg.skb = rep; 798 msg.portid = info->snd_portid; 799 msg.seq = info->snd_seq; 800 801 rtnl_lock(); 802 bearer = tipc_bearer_find(net, name); 803 if (!bearer) { 804 err = -EINVAL; 805 goto err_out; 806 } 807 808 err = __tipc_nl_add_bearer(&msg, bearer, 0); 809 if (err) 810 goto err_out; 811 rtnl_unlock(); 812 813 return genlmsg_reply(rep, info); 814 err_out: 815 rtnl_unlock(); 816 nlmsg_free(rep); 817 818 return err; 819 } 820 821 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 822 { 823 int err; 824 char *name; 825 struct tipc_bearer *bearer; 826 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 827 struct net *net = sock_net(skb->sk); 828 829 if (!info->attrs[TIPC_NLA_BEARER]) 830 return -EINVAL; 831 832 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 833 info->attrs[TIPC_NLA_BEARER], 834 tipc_nl_bearer_policy); 835 if (err) 836 return err; 837 838 if (!attrs[TIPC_NLA_BEARER_NAME]) 839 return -EINVAL; 840 841 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 842 843 rtnl_lock(); 844 bearer = tipc_bearer_find(net, name); 845 if (!bearer) { 846 rtnl_unlock(); 847 return -EINVAL; 848 } 849 850 bearer_disable(net, bearer); 851 rtnl_unlock(); 852 853 return 0; 854 } 855 856 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 857 { 858 int err; 859 char *bearer; 860 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 861 struct net *net = sock_net(skb->sk); 862 struct tipc_net *tn = net_generic(net, tipc_net_id); 863 u32 domain; 864 u32 prio; 865 866 prio = TIPC_MEDIA_LINK_PRI; 867 domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK; 868 869 if (!info->attrs[TIPC_NLA_BEARER]) 870 return -EINVAL; 871 872 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 873 info->attrs[TIPC_NLA_BEARER], 874 tipc_nl_bearer_policy); 875 if (err) 876 return err; 877 878 if (!attrs[TIPC_NLA_BEARER_NAME]) 879 return -EINVAL; 880 881 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 882 883 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 884 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 885 886 if (attrs[TIPC_NLA_BEARER_PROP]) { 887 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 888 889 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 890 props); 891 if (err) 892 return err; 893 894 if (props[TIPC_NLA_PROP_PRIO]) 895 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 896 } 897 898 rtnl_lock(); 899 err = tipc_enable_bearer(net, bearer, domain, prio, attrs); 900 if (err) { 901 rtnl_unlock(); 902 return err; 903 } 904 rtnl_unlock(); 905 906 return 0; 907 } 908 909 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info) 910 { 911 int err; 912 char *name; 913 struct tipc_bearer *b; 914 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 915 struct net *net = sock_net(skb->sk); 916 917 if (!info->attrs[TIPC_NLA_BEARER]) 918 return -EINVAL; 919 920 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 921 info->attrs[TIPC_NLA_BEARER], 922 tipc_nl_bearer_policy); 923 if (err) 924 return err; 925 926 if (!attrs[TIPC_NLA_BEARER_NAME]) 927 return -EINVAL; 928 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 929 930 rtnl_lock(); 931 b = tipc_bearer_find(net, name); 932 if (!b) { 933 rtnl_unlock(); 934 return -EINVAL; 935 } 936 937 #ifdef CONFIG_TIPC_MEDIA_UDP 938 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) { 939 err = tipc_udp_nl_bearer_add(b, 940 attrs[TIPC_NLA_BEARER_UDP_OPTS]); 941 if (err) { 942 rtnl_unlock(); 943 return err; 944 } 945 } 946 #endif 947 rtnl_unlock(); 948 949 return 0; 950 } 951 952 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 953 { 954 int err; 955 char *name; 956 struct tipc_bearer *b; 957 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 958 struct net *net = sock_net(skb->sk); 959 960 if (!info->attrs[TIPC_NLA_BEARER]) 961 return -EINVAL; 962 963 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 964 info->attrs[TIPC_NLA_BEARER], 965 tipc_nl_bearer_policy); 966 if (err) 967 return err; 968 969 if (!attrs[TIPC_NLA_BEARER_NAME]) 970 return -EINVAL; 971 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 972 973 rtnl_lock(); 974 b = tipc_bearer_find(net, name); 975 if (!b) { 976 rtnl_unlock(); 977 return -EINVAL; 978 } 979 980 if (attrs[TIPC_NLA_BEARER_PROP]) { 981 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 982 983 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 984 props); 985 if (err) { 986 rtnl_unlock(); 987 return err; 988 } 989 990 if (props[TIPC_NLA_PROP_TOL]) 991 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 992 if (props[TIPC_NLA_PROP_PRIO]) 993 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 994 if (props[TIPC_NLA_PROP_WIN]) 995 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 996 } 997 rtnl_unlock(); 998 999 return 0; 1000 } 1001 1002 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 1003 struct tipc_media *media, int nlflags) 1004 { 1005 void *hdr; 1006 struct nlattr *attrs; 1007 struct nlattr *prop; 1008 1009 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 1010 nlflags, TIPC_NL_MEDIA_GET); 1011 if (!hdr) 1012 return -EMSGSIZE; 1013 1014 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 1015 if (!attrs) 1016 goto msg_full; 1017 1018 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 1019 goto attr_msg_full; 1020 1021 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 1022 if (!prop) 1023 goto prop_msg_full; 1024 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 1025 goto prop_msg_full; 1026 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 1027 goto prop_msg_full; 1028 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 1029 goto prop_msg_full; 1030 1031 nla_nest_end(msg->skb, prop); 1032 nla_nest_end(msg->skb, attrs); 1033 genlmsg_end(msg->skb, hdr); 1034 1035 return 0; 1036 1037 prop_msg_full: 1038 nla_nest_cancel(msg->skb, prop); 1039 attr_msg_full: 1040 nla_nest_cancel(msg->skb, attrs); 1041 msg_full: 1042 genlmsg_cancel(msg->skb, hdr); 1043 1044 return -EMSGSIZE; 1045 } 1046 1047 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 1048 { 1049 int err; 1050 int i = cb->args[0]; 1051 struct tipc_nl_msg msg; 1052 1053 if (i == MAX_MEDIA) 1054 return 0; 1055 1056 msg.skb = skb; 1057 msg.portid = NETLINK_CB(cb->skb).portid; 1058 msg.seq = cb->nlh->nlmsg_seq; 1059 1060 rtnl_lock(); 1061 for (; media_info_array[i] != NULL; i++) { 1062 err = __tipc_nl_add_media(&msg, media_info_array[i], 1063 NLM_F_MULTI); 1064 if (err) 1065 break; 1066 } 1067 rtnl_unlock(); 1068 1069 cb->args[0] = i; 1070 return skb->len; 1071 } 1072 1073 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 1074 { 1075 int err; 1076 char *name; 1077 struct tipc_nl_msg msg; 1078 struct tipc_media *media; 1079 struct sk_buff *rep; 1080 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1081 1082 if (!info->attrs[TIPC_NLA_MEDIA]) 1083 return -EINVAL; 1084 1085 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1086 info->attrs[TIPC_NLA_MEDIA], 1087 tipc_nl_media_policy); 1088 if (err) 1089 return err; 1090 1091 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1092 return -EINVAL; 1093 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1094 1095 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1096 if (!rep) 1097 return -ENOMEM; 1098 1099 msg.skb = rep; 1100 msg.portid = info->snd_portid; 1101 msg.seq = info->snd_seq; 1102 1103 rtnl_lock(); 1104 media = tipc_media_find(name); 1105 if (!media) { 1106 err = -EINVAL; 1107 goto err_out; 1108 } 1109 1110 err = __tipc_nl_add_media(&msg, media, 0); 1111 if (err) 1112 goto err_out; 1113 rtnl_unlock(); 1114 1115 return genlmsg_reply(rep, info); 1116 err_out: 1117 rtnl_unlock(); 1118 nlmsg_free(rep); 1119 1120 return err; 1121 } 1122 1123 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1124 { 1125 int err; 1126 char *name; 1127 struct tipc_media *m; 1128 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1129 1130 if (!info->attrs[TIPC_NLA_MEDIA]) 1131 return -EINVAL; 1132 1133 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1134 info->attrs[TIPC_NLA_MEDIA], 1135 tipc_nl_media_policy); 1136 1137 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1138 return -EINVAL; 1139 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1140 1141 rtnl_lock(); 1142 m = tipc_media_find(name); 1143 if (!m) { 1144 rtnl_unlock(); 1145 return -EINVAL; 1146 } 1147 1148 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1149 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1150 1151 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1152 props); 1153 if (err) { 1154 rtnl_unlock(); 1155 return err; 1156 } 1157 1158 if (props[TIPC_NLA_PROP_TOL]) 1159 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1160 if (props[TIPC_NLA_PROP_PRIO]) 1161 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1162 if (props[TIPC_NLA_PROP_WIN]) 1163 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1164 } 1165 rtnl_unlock(); 1166 1167 return 0; 1168 } 1169