1 /* 2 * net/tipc/bearer.c: TIPC bearer code 3 * 4 * Copyright (c) 1996-2006, 2013-2014, Ericsson AB 5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the names of the copyright holders nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * Alternatively, this software may be distributed under the terms of the 21 * GNU General Public License ("GPL") version 2 as published by the Free 22 * Software Foundation. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include <net/sock.h> 38 #include "core.h" 39 #include "bearer.h" 40 #include "link.h" 41 #include "discover.h" 42 #include "bcast.h" 43 44 #define MAX_ADDR_STR 60 45 46 static struct tipc_media * const media_info_array[] = { 47 ð_media_info, 48 #ifdef CONFIG_TIPC_MEDIA_IB 49 &ib_media_info, 50 #endif 51 #ifdef CONFIG_TIPC_MEDIA_UDP 52 &udp_media_info, 53 #endif 54 NULL 55 }; 56 57 static const struct nla_policy 58 tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1] = { 59 [TIPC_NLA_BEARER_UNSPEC] = { .type = NLA_UNSPEC }, 60 [TIPC_NLA_BEARER_NAME] = { 61 .type = NLA_STRING, 62 .len = TIPC_MAX_BEARER_NAME 63 }, 64 [TIPC_NLA_BEARER_PROP] = { .type = NLA_NESTED }, 65 [TIPC_NLA_BEARER_DOMAIN] = { .type = NLA_U32 } 66 }; 67 68 static const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = { 69 [TIPC_NLA_MEDIA_UNSPEC] = { .type = NLA_UNSPEC }, 70 [TIPC_NLA_MEDIA_NAME] = { .type = NLA_STRING }, 71 [TIPC_NLA_MEDIA_PROP] = { .type = NLA_NESTED } 72 }; 73 74 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr); 75 76 /** 77 * tipc_media_find - locates specified media object by name 78 */ 79 struct tipc_media *tipc_media_find(const char *name) 80 { 81 u32 i; 82 83 for (i = 0; media_info_array[i] != NULL; i++) { 84 if (!strcmp(media_info_array[i]->name, name)) 85 break; 86 } 87 return media_info_array[i]; 88 } 89 90 /** 91 * media_find_id - locates specified media object by type identifier 92 */ 93 static struct tipc_media *media_find_id(u8 type) 94 { 95 u32 i; 96 97 for (i = 0; media_info_array[i] != NULL; i++) { 98 if (media_info_array[i]->type_id == type) 99 break; 100 } 101 return media_info_array[i]; 102 } 103 104 /** 105 * tipc_media_addr_printf - record media address in print buffer 106 */ 107 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) 108 { 109 char addr_str[MAX_ADDR_STR]; 110 struct tipc_media *m_ptr; 111 int ret; 112 113 m_ptr = media_find_id(a->media_id); 114 115 if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str))) 116 ret = scnprintf(buf, len, "%s(%s)", m_ptr->name, addr_str); 117 else { 118 u32 i; 119 120 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); 121 for (i = 0; i < sizeof(a->value); i++) 122 ret += scnprintf(buf - ret, len + ret, 123 "-%02x", a->value[i]); 124 } 125 } 126 127 /** 128 * bearer_name_validate - validate & (optionally) deconstruct bearer name 129 * @name: ptr to bearer name string 130 * @name_parts: ptr to area for bearer name components (or NULL if not needed) 131 * 132 * Returns 1 if bearer name is valid, otherwise 0. 133 */ 134 static int bearer_name_validate(const char *name, 135 struct tipc_bearer_names *name_parts) 136 { 137 char name_copy[TIPC_MAX_BEARER_NAME]; 138 char *media_name; 139 char *if_name; 140 u32 media_len; 141 u32 if_len; 142 143 /* copy bearer name & ensure length is OK */ 144 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; 145 /* need above in case non-Posix strncpy() doesn't pad with nulls */ 146 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); 147 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) 148 return 0; 149 150 /* ensure all component parts of bearer name are present */ 151 media_name = name_copy; 152 if_name = strchr(media_name, ':'); 153 if (if_name == NULL) 154 return 0; 155 *(if_name++) = 0; 156 media_len = if_name - media_name; 157 if_len = strlen(if_name) + 1; 158 159 /* validate component parts of bearer name */ 160 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || 161 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) 162 return 0; 163 164 /* return bearer name components, if necessary */ 165 if (name_parts) { 166 strcpy(name_parts->media_name, media_name); 167 strcpy(name_parts->if_name, if_name); 168 } 169 return 1; 170 } 171 172 /** 173 * tipc_bearer_find - locates bearer object with matching bearer name 174 */ 175 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) 176 { 177 struct tipc_net *tn = net_generic(net, tipc_net_id); 178 struct tipc_bearer *b_ptr; 179 u32 i; 180 181 for (i = 0; i < MAX_BEARERS; i++) { 182 b_ptr = rtnl_dereference(tn->bearer_list[i]); 183 if (b_ptr && (!strcmp(b_ptr->name, name))) 184 return b_ptr; 185 } 186 return NULL; 187 } 188 189 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) 190 { 191 struct tipc_net *tn = net_generic(net, tipc_net_id); 192 struct tipc_bearer *b_ptr; 193 194 rcu_read_lock(); 195 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 196 if (b_ptr) { 197 tipc_bcbearer_sort(net, &b_ptr->nodes, dest, true); 198 tipc_disc_add_dest(b_ptr->link_req); 199 } 200 rcu_read_unlock(); 201 } 202 203 void tipc_bearer_remove_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_ptr; 207 208 rcu_read_lock(); 209 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 210 if (b_ptr) { 211 tipc_bcbearer_sort(net, &b_ptr->nodes, dest, false); 212 tipc_disc_remove_dest(b_ptr->link_req); 213 } 214 rcu_read_unlock(); 215 } 216 217 /** 218 * tipc_enable_bearer - enable bearer with the given name 219 */ 220 static int tipc_enable_bearer(struct net *net, const char *name, 221 u32 disc_domain, u32 priority, 222 struct nlattr *attr[]) 223 { 224 struct tipc_net *tn = net_generic(net, tipc_net_id); 225 struct tipc_bearer *b_ptr; 226 struct tipc_media *m_ptr; 227 struct tipc_bearer_names b_names; 228 char addr_string[16]; 229 u32 bearer_id; 230 u32 with_this_prio; 231 u32 i; 232 int res = -EINVAL; 233 234 if (!tn->own_addr) { 235 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", 236 name); 237 return -ENOPROTOOPT; 238 } 239 if (!bearer_name_validate(name, &b_names)) { 240 pr_warn("Bearer <%s> rejected, illegal name\n", name); 241 return -EINVAL; 242 } 243 if (tipc_addr_domain_valid(disc_domain) && 244 (disc_domain != tn->own_addr)) { 245 if (tipc_in_scope(disc_domain, tn->own_addr)) { 246 disc_domain = tn->own_addr & TIPC_CLUSTER_MASK; 247 res = 0; /* accept any node in own cluster */ 248 } else if (in_own_cluster_exact(net, disc_domain)) 249 res = 0; /* accept specified node in own cluster */ 250 } 251 if (res) { 252 pr_warn("Bearer <%s> rejected, illegal discovery domain\n", 253 name); 254 return -EINVAL; 255 } 256 if ((priority > TIPC_MAX_LINK_PRI) && 257 (priority != TIPC_MEDIA_LINK_PRI)) { 258 pr_warn("Bearer <%s> rejected, illegal priority\n", name); 259 return -EINVAL; 260 } 261 262 m_ptr = tipc_media_find(b_names.media_name); 263 if (!m_ptr) { 264 pr_warn("Bearer <%s> rejected, media <%s> not registered\n", 265 name, b_names.media_name); 266 return -EINVAL; 267 } 268 269 if (priority == TIPC_MEDIA_LINK_PRI) 270 priority = m_ptr->priority; 271 272 restart: 273 bearer_id = MAX_BEARERS; 274 with_this_prio = 1; 275 for (i = MAX_BEARERS; i-- != 0; ) { 276 b_ptr = rtnl_dereference(tn->bearer_list[i]); 277 if (!b_ptr) { 278 bearer_id = i; 279 continue; 280 } 281 if (!strcmp(name, b_ptr->name)) { 282 pr_warn("Bearer <%s> rejected, already enabled\n", 283 name); 284 return -EINVAL; 285 } 286 if ((b_ptr->priority == priority) && 287 (++with_this_prio > 2)) { 288 if (priority-- == 0) { 289 pr_warn("Bearer <%s> rejected, duplicate priority\n", 290 name); 291 return -EINVAL; 292 } 293 pr_warn("Bearer <%s> priority adjustment required %u->%u\n", 294 name, priority + 1, priority); 295 goto restart; 296 } 297 } 298 if (bearer_id >= MAX_BEARERS) { 299 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", 300 name, MAX_BEARERS); 301 return -EINVAL; 302 } 303 304 b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC); 305 if (!b_ptr) 306 return -ENOMEM; 307 308 strcpy(b_ptr->name, name); 309 b_ptr->media = m_ptr; 310 res = m_ptr->enable_media(net, b_ptr, attr); 311 if (res) { 312 pr_warn("Bearer <%s> rejected, enable failure (%d)\n", 313 name, -res); 314 return -EINVAL; 315 } 316 317 b_ptr->identity = bearer_id; 318 b_ptr->tolerance = m_ptr->tolerance; 319 b_ptr->window = m_ptr->window; 320 b_ptr->domain = disc_domain; 321 b_ptr->net_plane = bearer_id + 'A'; 322 b_ptr->priority = priority; 323 324 res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr); 325 if (res) { 326 bearer_disable(net, b_ptr); 327 pr_warn("Bearer <%s> rejected, discovery object creation failed\n", 328 name); 329 return -EINVAL; 330 } 331 332 rcu_assign_pointer(tn->bearer_list[bearer_id], b_ptr); 333 334 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", 335 name, 336 tipc_addr_string_fill(addr_string, disc_domain), priority); 337 return res; 338 } 339 340 /** 341 * tipc_reset_bearer - Reset all links established over this bearer 342 */ 343 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr) 344 { 345 pr_info("Resetting bearer <%s>\n", b_ptr->name); 346 tipc_link_delete_list(net, b_ptr->identity); 347 tipc_disc_reset(net, b_ptr); 348 return 0; 349 } 350 351 /** 352 * bearer_disable 353 * 354 * Note: This routine assumes caller holds RTNL lock. 355 */ 356 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr) 357 { 358 struct tipc_net *tn = net_generic(net, tipc_net_id); 359 u32 i; 360 361 pr_info("Disabling bearer <%s>\n", b_ptr->name); 362 b_ptr->media->disable_media(b_ptr); 363 364 tipc_link_delete_list(net, b_ptr->identity); 365 if (b_ptr->link_req) 366 tipc_disc_delete(b_ptr->link_req); 367 368 for (i = 0; i < MAX_BEARERS; i++) { 369 if (b_ptr == rtnl_dereference(tn->bearer_list[i])) { 370 RCU_INIT_POINTER(tn->bearer_list[i], NULL); 371 break; 372 } 373 } 374 kfree_rcu(b_ptr, rcu); 375 } 376 377 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 378 struct nlattr *attr[]) 379 { 380 struct net_device *dev; 381 char *driver_name = strchr((const char *)b->name, ':') + 1; 382 383 /* Find device with specified name */ 384 dev = dev_get_by_name(net, driver_name); 385 if (!dev) 386 return -ENODEV; 387 388 /* Associate TIPC bearer with L2 bearer */ 389 rcu_assign_pointer(b->media_ptr, dev); 390 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 391 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); 392 b->bcast_addr.media_id = b->media->type_id; 393 b->bcast_addr.broadcast = 1; 394 b->mtu = dev->mtu; 395 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 396 rcu_assign_pointer(dev->tipc_ptr, b); 397 return 0; 398 } 399 400 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 401 * 402 * Mark L2 bearer as inactive so that incoming buffers are thrown away, 403 * then get worker thread to complete bearer cleanup. (Can't do cleanup 404 * here because cleanup code needs to sleep and caller holds spinlocks.) 405 */ 406 void tipc_disable_l2_media(struct tipc_bearer *b) 407 { 408 struct net_device *dev; 409 410 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 411 RCU_INIT_POINTER(b->media_ptr, NULL); 412 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 413 synchronize_net(); 414 dev_put(dev); 415 } 416 417 /** 418 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 419 * @buf: the packet to be sent 420 * @b_ptr: the bearer through which the packet is to be sent 421 * @dest: peer destination address 422 */ 423 int tipc_l2_send_msg(struct net *net, struct sk_buff *buf, 424 struct tipc_bearer *b, struct tipc_media_addr *dest) 425 { 426 struct sk_buff *clone; 427 struct net_device *dev; 428 int delta; 429 430 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 431 if (!dev) 432 return 0; 433 434 clone = skb_clone(buf, GFP_ATOMIC); 435 if (!clone) 436 return 0; 437 438 delta = dev->hard_header_len - skb_headroom(buf); 439 if ((delta > 0) && 440 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { 441 kfree_skb(clone); 442 return 0; 443 } 444 445 skb_reset_network_header(clone); 446 clone->dev = dev; 447 clone->protocol = htons(ETH_P_TIPC); 448 dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, 449 dev->dev_addr, clone->len); 450 dev_queue_xmit(clone); 451 return 0; 452 } 453 454 /* tipc_bearer_send- sends buffer to destination over bearer 455 * 456 * IMPORTANT: 457 * The media send routine must not alter the buffer being passed in 458 * as it may be needed for later retransmission! 459 */ 460 void tipc_bearer_send(struct net *net, u32 bearer_id, struct sk_buff *buf, 461 struct tipc_media_addr *dest) 462 { 463 struct tipc_net *tn = net_generic(net, tipc_net_id); 464 struct tipc_bearer *b_ptr; 465 466 rcu_read_lock(); 467 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 468 if (likely(b_ptr)) 469 b_ptr->media->send_msg(net, buf, b_ptr, dest); 470 rcu_read_unlock(); 471 } 472 473 /** 474 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 475 * @buf: the received packet 476 * @dev: the net device that the packet was received on 477 * @pt: the packet_type structure which was used to register this handler 478 * @orig_dev: the original receive net device in case the device is a bond 479 * 480 * Accept only packets explicitly sent to this node, or broadcast packets; 481 * ignores packets sent using interface multicast, and traffic sent to other 482 * nodes (which can happen if interface is running in promiscuous mode). 483 */ 484 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev, 485 struct packet_type *pt, struct net_device *orig_dev) 486 { 487 struct tipc_bearer *b_ptr; 488 489 rcu_read_lock(); 490 b_ptr = rcu_dereference_rtnl(dev->tipc_ptr); 491 if (likely(b_ptr)) { 492 if (likely(buf->pkt_type <= PACKET_BROADCAST)) { 493 buf->next = NULL; 494 tipc_rcv(dev_net(dev), buf, b_ptr); 495 rcu_read_unlock(); 496 return NET_RX_SUCCESS; 497 } 498 } 499 rcu_read_unlock(); 500 501 kfree_skb(buf); 502 return NET_RX_DROP; 503 } 504 505 /** 506 * tipc_l2_device_event - handle device events from network device 507 * @nb: the context of the notification 508 * @evt: the type of event 509 * @ptr: the net device that the event was on 510 * 511 * This function is called by the Ethernet driver in case of link 512 * change event. 513 */ 514 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 515 void *ptr) 516 { 517 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 518 struct net *net = dev_net(dev); 519 struct tipc_bearer *b_ptr; 520 521 b_ptr = rtnl_dereference(dev->tipc_ptr); 522 if (!b_ptr) 523 return NOTIFY_DONE; 524 525 b_ptr->mtu = dev->mtu; 526 527 switch (evt) { 528 case NETDEV_CHANGE: 529 if (netif_carrier_ok(dev)) 530 break; 531 case NETDEV_DOWN: 532 case NETDEV_CHANGEMTU: 533 tipc_reset_bearer(net, b_ptr); 534 break; 535 case NETDEV_CHANGEADDR: 536 b_ptr->media->raw2addr(b_ptr, &b_ptr->addr, 537 (char *)dev->dev_addr); 538 tipc_reset_bearer(net, b_ptr); 539 break; 540 case NETDEV_UNREGISTER: 541 case NETDEV_CHANGENAME: 542 bearer_disable(dev_net(dev), b_ptr); 543 break; 544 } 545 return NOTIFY_OK; 546 } 547 548 static struct packet_type tipc_packet_type __read_mostly = { 549 .type = htons(ETH_P_TIPC), 550 .func = tipc_l2_rcv_msg, 551 }; 552 553 static struct notifier_block notifier = { 554 .notifier_call = tipc_l2_device_event, 555 .priority = 0, 556 }; 557 558 int tipc_bearer_setup(void) 559 { 560 int err; 561 562 err = register_netdevice_notifier(¬ifier); 563 if (err) 564 return err; 565 dev_add_pack(&tipc_packet_type); 566 return 0; 567 } 568 569 void tipc_bearer_cleanup(void) 570 { 571 unregister_netdevice_notifier(¬ifier); 572 dev_remove_pack(&tipc_packet_type); 573 } 574 575 void tipc_bearer_stop(struct net *net) 576 { 577 struct tipc_net *tn = net_generic(net, tipc_net_id); 578 struct tipc_bearer *b_ptr; 579 u32 i; 580 581 for (i = 0; i < MAX_BEARERS; i++) { 582 b_ptr = rtnl_dereference(tn->bearer_list[i]); 583 if (b_ptr) { 584 bearer_disable(net, b_ptr); 585 tn->bearer_list[i] = NULL; 586 } 587 } 588 } 589 590 /* Caller should hold rtnl_lock to protect the bearer */ 591 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 592 struct tipc_bearer *bearer, int nlflags) 593 { 594 void *hdr; 595 struct nlattr *attrs; 596 struct nlattr *prop; 597 598 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 599 nlflags, TIPC_NL_BEARER_GET); 600 if (!hdr) 601 return -EMSGSIZE; 602 603 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 604 if (!attrs) 605 goto msg_full; 606 607 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 608 goto attr_msg_full; 609 610 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 611 if (!prop) 612 goto prop_msg_full; 613 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 614 goto prop_msg_full; 615 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 616 goto prop_msg_full; 617 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 618 goto prop_msg_full; 619 620 nla_nest_end(msg->skb, prop); 621 nla_nest_end(msg->skb, attrs); 622 genlmsg_end(msg->skb, hdr); 623 624 return 0; 625 626 prop_msg_full: 627 nla_nest_cancel(msg->skb, prop); 628 attr_msg_full: 629 nla_nest_cancel(msg->skb, attrs); 630 msg_full: 631 genlmsg_cancel(msg->skb, hdr); 632 633 return -EMSGSIZE; 634 } 635 636 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 637 { 638 int err; 639 int i = cb->args[0]; 640 struct tipc_bearer *bearer; 641 struct tipc_nl_msg msg; 642 struct net *net = sock_net(skb->sk); 643 struct tipc_net *tn = net_generic(net, tipc_net_id); 644 645 if (i == MAX_BEARERS) 646 return 0; 647 648 msg.skb = skb; 649 msg.portid = NETLINK_CB(cb->skb).portid; 650 msg.seq = cb->nlh->nlmsg_seq; 651 652 rtnl_lock(); 653 for (i = 0; i < MAX_BEARERS; i++) { 654 bearer = rtnl_dereference(tn->bearer_list[i]); 655 if (!bearer) 656 continue; 657 658 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 659 if (err) 660 break; 661 } 662 rtnl_unlock(); 663 664 cb->args[0] = i; 665 return skb->len; 666 } 667 668 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 669 { 670 int err; 671 char *name; 672 struct sk_buff *rep; 673 struct tipc_bearer *bearer; 674 struct tipc_nl_msg msg; 675 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 676 struct net *net = genl_info_net(info); 677 678 if (!info->attrs[TIPC_NLA_BEARER]) 679 return -EINVAL; 680 681 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 682 info->attrs[TIPC_NLA_BEARER], 683 tipc_nl_bearer_policy); 684 if (err) 685 return err; 686 687 if (!attrs[TIPC_NLA_BEARER_NAME]) 688 return -EINVAL; 689 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 690 691 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 692 if (!rep) 693 return -ENOMEM; 694 695 msg.skb = rep; 696 msg.portid = info->snd_portid; 697 msg.seq = info->snd_seq; 698 699 rtnl_lock(); 700 bearer = tipc_bearer_find(net, name); 701 if (!bearer) { 702 err = -EINVAL; 703 goto err_out; 704 } 705 706 err = __tipc_nl_add_bearer(&msg, bearer, 0); 707 if (err) 708 goto err_out; 709 rtnl_unlock(); 710 711 return genlmsg_reply(rep, info); 712 err_out: 713 rtnl_unlock(); 714 nlmsg_free(rep); 715 716 return err; 717 } 718 719 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 720 { 721 int err; 722 char *name; 723 struct tipc_bearer *bearer; 724 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 725 struct net *net = sock_net(skb->sk); 726 727 if (!info->attrs[TIPC_NLA_BEARER]) 728 return -EINVAL; 729 730 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 731 info->attrs[TIPC_NLA_BEARER], 732 tipc_nl_bearer_policy); 733 if (err) 734 return err; 735 736 if (!attrs[TIPC_NLA_BEARER_NAME]) 737 return -EINVAL; 738 739 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 740 741 rtnl_lock(); 742 bearer = tipc_bearer_find(net, name); 743 if (!bearer) { 744 rtnl_unlock(); 745 return -EINVAL; 746 } 747 748 bearer_disable(net, bearer); 749 rtnl_unlock(); 750 751 return 0; 752 } 753 754 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 755 { 756 int err; 757 char *bearer; 758 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 759 struct net *net = sock_net(skb->sk); 760 struct tipc_net *tn = net_generic(net, tipc_net_id); 761 u32 domain; 762 u32 prio; 763 764 prio = TIPC_MEDIA_LINK_PRI; 765 domain = tn->own_addr & TIPC_CLUSTER_MASK; 766 767 if (!info->attrs[TIPC_NLA_BEARER]) 768 return -EINVAL; 769 770 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 771 info->attrs[TIPC_NLA_BEARER], 772 tipc_nl_bearer_policy); 773 if (err) 774 return err; 775 776 if (!attrs[TIPC_NLA_BEARER_NAME]) 777 return -EINVAL; 778 779 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 780 781 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 782 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 783 784 if (attrs[TIPC_NLA_BEARER_PROP]) { 785 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 786 787 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 788 props); 789 if (err) 790 return err; 791 792 if (props[TIPC_NLA_PROP_PRIO]) 793 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 794 } 795 796 rtnl_lock(); 797 err = tipc_enable_bearer(net, bearer, domain, prio, attrs); 798 if (err) { 799 rtnl_unlock(); 800 return err; 801 } 802 rtnl_unlock(); 803 804 return 0; 805 } 806 807 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 808 { 809 int err; 810 char *name; 811 struct tipc_bearer *b; 812 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 813 struct net *net = sock_net(skb->sk); 814 815 if (!info->attrs[TIPC_NLA_BEARER]) 816 return -EINVAL; 817 818 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 819 info->attrs[TIPC_NLA_BEARER], 820 tipc_nl_bearer_policy); 821 if (err) 822 return err; 823 824 if (!attrs[TIPC_NLA_BEARER_NAME]) 825 return -EINVAL; 826 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 827 828 rtnl_lock(); 829 b = tipc_bearer_find(net, name); 830 if (!b) { 831 rtnl_unlock(); 832 return -EINVAL; 833 } 834 835 if (attrs[TIPC_NLA_BEARER_PROP]) { 836 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 837 838 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 839 props); 840 if (err) { 841 rtnl_unlock(); 842 return err; 843 } 844 845 if (props[TIPC_NLA_PROP_TOL]) 846 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 847 if (props[TIPC_NLA_PROP_PRIO]) 848 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 849 if (props[TIPC_NLA_PROP_WIN]) 850 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 851 } 852 rtnl_unlock(); 853 854 return 0; 855 } 856 857 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 858 struct tipc_media *media, int nlflags) 859 { 860 void *hdr; 861 struct nlattr *attrs; 862 struct nlattr *prop; 863 864 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 865 nlflags, TIPC_NL_MEDIA_GET); 866 if (!hdr) 867 return -EMSGSIZE; 868 869 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 870 if (!attrs) 871 goto msg_full; 872 873 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 874 goto attr_msg_full; 875 876 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 877 if (!prop) 878 goto prop_msg_full; 879 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 880 goto prop_msg_full; 881 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 882 goto prop_msg_full; 883 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 884 goto prop_msg_full; 885 886 nla_nest_end(msg->skb, prop); 887 nla_nest_end(msg->skb, attrs); 888 genlmsg_end(msg->skb, hdr); 889 890 return 0; 891 892 prop_msg_full: 893 nla_nest_cancel(msg->skb, prop); 894 attr_msg_full: 895 nla_nest_cancel(msg->skb, attrs); 896 msg_full: 897 genlmsg_cancel(msg->skb, hdr); 898 899 return -EMSGSIZE; 900 } 901 902 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 903 { 904 int err; 905 int i = cb->args[0]; 906 struct tipc_nl_msg msg; 907 908 if (i == MAX_MEDIA) 909 return 0; 910 911 msg.skb = skb; 912 msg.portid = NETLINK_CB(cb->skb).portid; 913 msg.seq = cb->nlh->nlmsg_seq; 914 915 rtnl_lock(); 916 for (; media_info_array[i] != NULL; i++) { 917 err = __tipc_nl_add_media(&msg, media_info_array[i], 918 NLM_F_MULTI); 919 if (err) 920 break; 921 } 922 rtnl_unlock(); 923 924 cb->args[0] = i; 925 return skb->len; 926 } 927 928 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 929 { 930 int err; 931 char *name; 932 struct tipc_nl_msg msg; 933 struct tipc_media *media; 934 struct sk_buff *rep; 935 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 936 937 if (!info->attrs[TIPC_NLA_MEDIA]) 938 return -EINVAL; 939 940 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 941 info->attrs[TIPC_NLA_MEDIA], 942 tipc_nl_media_policy); 943 if (err) 944 return err; 945 946 if (!attrs[TIPC_NLA_MEDIA_NAME]) 947 return -EINVAL; 948 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 949 950 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 951 if (!rep) 952 return -ENOMEM; 953 954 msg.skb = rep; 955 msg.portid = info->snd_portid; 956 msg.seq = info->snd_seq; 957 958 rtnl_lock(); 959 media = tipc_media_find(name); 960 if (!media) { 961 err = -EINVAL; 962 goto err_out; 963 } 964 965 err = __tipc_nl_add_media(&msg, media, 0); 966 if (err) 967 goto err_out; 968 rtnl_unlock(); 969 970 return genlmsg_reply(rep, info); 971 err_out: 972 rtnl_unlock(); 973 nlmsg_free(rep); 974 975 return err; 976 } 977 978 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 979 { 980 int err; 981 char *name; 982 struct tipc_media *m; 983 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 984 985 if (!info->attrs[TIPC_NLA_MEDIA]) 986 return -EINVAL; 987 988 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 989 info->attrs[TIPC_NLA_MEDIA], 990 tipc_nl_media_policy); 991 992 if (!attrs[TIPC_NLA_MEDIA_NAME]) 993 return -EINVAL; 994 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 995 996 rtnl_lock(); 997 m = tipc_media_find(name); 998 if (!m) { 999 rtnl_unlock(); 1000 return -EINVAL; 1001 } 1002 1003 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1004 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1005 1006 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1007 props); 1008 if (err) { 1009 rtnl_unlock(); 1010 return err; 1011 } 1012 1013 if (props[TIPC_NLA_PROP_TOL]) 1014 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1015 if (props[TIPC_NLA_PROP_PRIO]) 1016 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1017 if (props[TIPC_NLA_PROP_WIN]) 1018 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1019 } 1020 rtnl_unlock(); 1021 1022 return 0; 1023 } 1024