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 46static 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 57static const struct nla_policy 58tipc_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 68static 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 74static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr, 75 bool shutting_down); 76 77/** 78 * tipc_media_find - locates specified media object by name 79 */ 80struct tipc_media *tipc_media_find(const char *name) 81{ 82 u32 i; 83 84 for (i = 0; media_info_array[i] != NULL; i++) { 85 if (!strcmp(media_info_array[i]->name, name)) 86 break; 87 } 88 return media_info_array[i]; 89} 90 91/** 92 * media_find_id - locates specified media object by type identifier 93 */ 94static struct tipc_media *media_find_id(u8 type) 95{ 96 u32 i; 97 98 for (i = 0; media_info_array[i] != NULL; i++) { 99 if (media_info_array[i]->type_id == type) 100 break; 101 } 102 return media_info_array[i]; 103} 104 105/** 106 * tipc_media_addr_printf - record media address in print buffer 107 */ 108void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) 109{ 110 char addr_str[MAX_ADDR_STR]; 111 struct tipc_media *m_ptr; 112 int ret; 113 114 m_ptr = media_find_id(a->media_id); 115 116 if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str))) 117 ret = scnprintf(buf, len, "%s(%s)", m_ptr->name, addr_str); 118 else { 119 u32 i; 120 121 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); 122 for (i = 0; i < sizeof(a->value); i++) 123 ret += scnprintf(buf - ret, len + ret, 124 "-%02x", a->value[i]); 125 } 126} 127 128/** 129 * bearer_name_validate - validate & (optionally) deconstruct bearer name 130 * @name: ptr to bearer name string 131 * @name_parts: ptr to area for bearer name components (or NULL if not needed) 132 * 133 * Returns 1 if bearer name is valid, otherwise 0. 134 */ 135static int bearer_name_validate(const char *name, 136 struct tipc_bearer_names *name_parts) 137{ 138 char name_copy[TIPC_MAX_BEARER_NAME]; 139 char *media_name; 140 char *if_name; 141 u32 media_len; 142 u32 if_len; 143 144 /* copy bearer name & ensure length is OK */ 145 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; 146 /* need above in case non-Posix strncpy() doesn't pad with nulls */ 147 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); 148 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) 149 return 0; 150 151 /* ensure all component parts of bearer name are present */ 152 media_name = name_copy; 153 if_name = strchr(media_name, ':'); 154 if (if_name == NULL) 155 return 0; 156 *(if_name++) = 0; 157 media_len = if_name - media_name; 158 if_len = strlen(if_name) + 1; 159 160 /* validate component parts of bearer name */ 161 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || 162 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) 163 return 0; 164 165 /* return bearer name components, if necessary */ 166 if (name_parts) { 167 strcpy(name_parts->media_name, media_name); 168 strcpy(name_parts->if_name, if_name); 169 } 170 return 1; 171} 172 173/** 174 * tipc_bearer_find - locates bearer object with matching bearer name 175 */ 176struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) 177{ 178 struct tipc_net *tn = net_generic(net, tipc_net_id); 179 struct tipc_bearer *b_ptr; 180 u32 i; 181 182 for (i = 0; i < MAX_BEARERS; i++) { 183 b_ptr = rtnl_dereference(tn->bearer_list[i]); 184 if (b_ptr && (!strcmp(b_ptr->name, name))) 185 return b_ptr; 186 } 187 return NULL; 188} 189 190void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) 191{ 192 struct tipc_net *tn = net_generic(net, tipc_net_id); 193 struct tipc_bearer *b_ptr; 194 195 rcu_read_lock(); 196 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 197 if (b_ptr) { 198 tipc_bcbearer_sort(net, &b_ptr->nodes, dest, true); 199 tipc_disc_add_dest(b_ptr->link_req); 200 } 201 rcu_read_unlock(); 202} 203 204void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) 205{ 206 struct tipc_net *tn = net_generic(net, tipc_net_id); 207 struct tipc_bearer *b_ptr; 208 209 rcu_read_lock(); 210 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 211 if (b_ptr) { 212 tipc_bcbearer_sort(net, &b_ptr->nodes, dest, false); 213 tipc_disc_remove_dest(b_ptr->link_req); 214 } 215 rcu_read_unlock(); 216} 217 218/** 219 * tipc_enable_bearer - enable bearer with the given name 220 */ 221static int tipc_enable_bearer(struct net *net, const char *name, 222 u32 disc_domain, u32 priority, 223 struct nlattr *attr[]) 224{ 225 struct tipc_net *tn = net_generic(net, tipc_net_id); 226 struct tipc_bearer *b_ptr; 227 struct tipc_media *m_ptr; 228 struct tipc_bearer_names b_names; 229 char addr_string[16]; 230 u32 bearer_id; 231 u32 with_this_prio; 232 u32 i; 233 int res = -EINVAL; 234 235 if (!tn->own_addr) { 236 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", 237 name); 238 return -ENOPROTOOPT; 239 } 240 if (!bearer_name_validate(name, &b_names)) { 241 pr_warn("Bearer <%s> rejected, illegal name\n", name); 242 return -EINVAL; 243 } 244 if (tipc_addr_domain_valid(disc_domain) && 245 (disc_domain != tn->own_addr)) { 246 if (tipc_in_scope(disc_domain, tn->own_addr)) { 247 disc_domain = tn->own_addr & TIPC_CLUSTER_MASK; 248 res = 0; /* accept any node in own cluster */ 249 } else if (in_own_cluster_exact(net, disc_domain)) 250 res = 0; /* accept specified node in own cluster */ 251 } 252 if (res) { 253 pr_warn("Bearer <%s> rejected, illegal discovery domain\n", 254 name); 255 return -EINVAL; 256 } 257 if ((priority > TIPC_MAX_LINK_PRI) && 258 (priority != TIPC_MEDIA_LINK_PRI)) { 259 pr_warn("Bearer <%s> rejected, illegal priority\n", name); 260 return -EINVAL; 261 } 262 263 m_ptr = tipc_media_find(b_names.media_name); 264 if (!m_ptr) { 265 pr_warn("Bearer <%s> rejected, media <%s> not registered\n", 266 name, b_names.media_name); 267 return -EINVAL; 268 } 269 270 if (priority == TIPC_MEDIA_LINK_PRI) 271 priority = m_ptr->priority; 272 273restart: 274 bearer_id = MAX_BEARERS; 275 with_this_prio = 1; 276 for (i = MAX_BEARERS; i-- != 0; ) { 277 b_ptr = rtnl_dereference(tn->bearer_list[i]); 278 if (!b_ptr) { 279 bearer_id = i; 280 continue; 281 } 282 if (!strcmp(name, b_ptr->name)) { 283 pr_warn("Bearer <%s> rejected, already enabled\n", 284 name); 285 return -EINVAL; 286 } 287 if ((b_ptr->priority == priority) && 288 (++with_this_prio > 2)) { 289 if (priority-- == 0) { 290 pr_warn("Bearer <%s> rejected, duplicate priority\n", 291 name); 292 return -EINVAL; 293 } 294 pr_warn("Bearer <%s> priority adjustment required %u->%u\n", 295 name, priority + 1, priority); 296 goto restart; 297 } 298 } 299 if (bearer_id >= MAX_BEARERS) { 300 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", 301 name, MAX_BEARERS); 302 return -EINVAL; 303 } 304 305 b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC); 306 if (!b_ptr) 307 return -ENOMEM; 308 309 strcpy(b_ptr->name, name); 310 b_ptr->media = m_ptr; 311 res = m_ptr->enable_media(net, b_ptr, attr); 312 if (res) { 313 pr_warn("Bearer <%s> rejected, enable failure (%d)\n", 314 name, -res); 315 return -EINVAL; 316 } 317 318 b_ptr->identity = bearer_id; 319 b_ptr->tolerance = m_ptr->tolerance; 320 b_ptr->window = m_ptr->window; 321 b_ptr->domain = disc_domain; 322 b_ptr->net_plane = bearer_id + 'A'; 323 b_ptr->priority = priority; 324 325 res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr); 326 if (res) { 327 bearer_disable(net, b_ptr, false); 328 pr_warn("Bearer <%s> rejected, discovery object creation failed\n", 329 name); 330 return -EINVAL; 331 } 332 333 rcu_assign_pointer(tn->bearer_list[bearer_id], b_ptr); 334 335 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", 336 name, 337 tipc_addr_string_fill(addr_string, disc_domain), priority); 338 return res; 339} 340 341/** 342 * tipc_reset_bearer - Reset all links established over this bearer 343 */ 344static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr) 345{ 346 pr_info("Resetting bearer <%s>\n", b_ptr->name); 347 tipc_link_reset_list(net, b_ptr->identity); 348 tipc_disc_reset(net, b_ptr); 349 return 0; 350} 351 352/** 353 * bearer_disable 354 * 355 * Note: This routine assumes caller holds RTNL lock. 356 */ 357static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr, 358 bool shutting_down) 359{ 360 struct tipc_net *tn = net_generic(net, tipc_net_id); 361 u32 i; 362 363 pr_info("Disabling bearer <%s>\n", b_ptr->name); 364 b_ptr->media->disable_media(b_ptr); 365 366 tipc_link_delete_list(net, b_ptr->identity, shutting_down); 367 if (b_ptr->link_req) 368 tipc_disc_delete(b_ptr->link_req); 369 370 for (i = 0; i < MAX_BEARERS; i++) { 371 if (b_ptr == rtnl_dereference(tn->bearer_list[i])) { 372 RCU_INIT_POINTER(tn->bearer_list[i], NULL); 373 break; 374 } 375 } 376 kfree_rcu(b_ptr, rcu); 377} 378 379int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 380 struct nlattr *attr[]) 381{ 382 struct net_device *dev; 383 char *driver_name = strchr((const char *)b->name, ':') + 1; 384 385 /* Find device with specified name */ 386 dev = dev_get_by_name(net, driver_name); 387 if (!dev) 388 return -ENODEV; 389 390 /* Associate TIPC bearer with L2 bearer */ 391 rcu_assign_pointer(b->media_ptr, dev); 392 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 393 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); 394 b->bcast_addr.media_id = b->media->type_id; 395 b->bcast_addr.broadcast = 1; 396 b->mtu = dev->mtu; 397 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 398 rcu_assign_pointer(dev->tipc_ptr, b); 399 return 0; 400} 401 402/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 403 * 404 * Mark L2 bearer as inactive so that incoming buffers are thrown away, 405 * then get worker thread to complete bearer cleanup. (Can't do cleanup 406 * here because cleanup code needs to sleep and caller holds spinlocks.) 407 */ 408void tipc_disable_l2_media(struct tipc_bearer *b) 409{ 410 struct net_device *dev; 411 412 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 413 RCU_INIT_POINTER(b->media_ptr, NULL); 414 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 415 synchronize_net(); 416 dev_put(dev); 417} 418 419/** 420 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 421 * @buf: the packet to be sent 422 * @b_ptr: the bearer through which the packet is to be sent 423 * @dest: peer destination address 424 */ 425int tipc_l2_send_msg(struct net *net, struct sk_buff *buf, 426 struct tipc_bearer *b, struct tipc_media_addr *dest) 427{ 428 struct sk_buff *clone; 429 struct net_device *dev; 430 int delta; 431 432 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 433 if (!dev) 434 return 0; 435 436 clone = skb_clone(buf, GFP_ATOMIC); 437 if (!clone) 438 return 0; 439 440 delta = dev->hard_header_len - skb_headroom(buf); 441 if ((delta > 0) && 442 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { 443 kfree_skb(clone); 444 return 0; 445 } 446 447 skb_reset_network_header(clone); 448 clone->dev = dev; 449 clone->protocol = htons(ETH_P_TIPC); 450 dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, 451 dev->dev_addr, clone->len); 452 dev_queue_xmit(clone); 453 return 0; 454} 455 456/* tipc_bearer_send- sends buffer to destination over bearer 457 * 458 * IMPORTANT: 459 * The media send routine must not alter the buffer being passed in 460 * as it may be needed for later retransmission! 461 */ 462void tipc_bearer_send(struct net *net, u32 bearer_id, struct sk_buff *buf, 463 struct tipc_media_addr *dest) 464{ 465 struct tipc_net *tn = net_generic(net, tipc_net_id); 466 struct tipc_bearer *b_ptr; 467 468 rcu_read_lock(); 469 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 470 if (likely(b_ptr)) 471 b_ptr->media->send_msg(net, buf, b_ptr, dest); 472 rcu_read_unlock(); 473} 474 475/** 476 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 477 * @buf: the received packet 478 * @dev: the net device that the packet was received on 479 * @pt: the packet_type structure which was used to register this handler 480 * @orig_dev: the original receive net device in case the device is a bond 481 * 482 * Accept only packets explicitly sent to this node, or broadcast packets; 483 * ignores packets sent using interface multicast, and traffic sent to other 484 * nodes (which can happen if interface is running in promiscuous mode). 485 */ 486static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev, 487 struct packet_type *pt, struct net_device *orig_dev) 488{ 489 struct tipc_bearer *b_ptr; 490 491 rcu_read_lock(); 492 b_ptr = rcu_dereference_rtnl(dev->tipc_ptr); 493 if (likely(b_ptr)) { 494 if (likely(buf->pkt_type <= PACKET_BROADCAST)) { 495 buf->next = NULL; 496 tipc_rcv(dev_net(dev), buf, b_ptr); 497 rcu_read_unlock(); 498 return NET_RX_SUCCESS; 499 } 500 } 501 rcu_read_unlock(); 502 503 kfree_skb(buf); 504 return NET_RX_DROP; 505} 506 507/** 508 * tipc_l2_device_event - handle device events from network device 509 * @nb: the context of the notification 510 * @evt: the type of event 511 * @ptr: the net device that the event was on 512 * 513 * This function is called by the Ethernet driver in case of link 514 * change event. 515 */ 516static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 517 void *ptr) 518{ 519 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 520 struct net *net = dev_net(dev); 521 struct tipc_bearer *b_ptr; 522 523 b_ptr = rtnl_dereference(dev->tipc_ptr); 524 if (!b_ptr) 525 return NOTIFY_DONE; 526 527 b_ptr->mtu = dev->mtu; 528 529 switch (evt) { 530 case NETDEV_CHANGE: 531 if (netif_carrier_ok(dev)) 532 break; 533 case NETDEV_DOWN: 534 case NETDEV_CHANGEMTU: 535 tipc_reset_bearer(net, b_ptr); 536 break; 537 case NETDEV_CHANGEADDR: 538 b_ptr->media->raw2addr(b_ptr, &b_ptr->addr, 539 (char *)dev->dev_addr); 540 tipc_reset_bearer(net, b_ptr); 541 break; 542 case NETDEV_UNREGISTER: 543 case NETDEV_CHANGENAME: 544 bearer_disable(dev_net(dev), b_ptr, false); 545 break; 546 } 547 return NOTIFY_OK; 548} 549 550static struct packet_type tipc_packet_type __read_mostly = { 551 .type = htons(ETH_P_TIPC), 552 .func = tipc_l2_rcv_msg, 553}; 554 555static struct notifier_block notifier = { 556 .notifier_call = tipc_l2_device_event, 557 .priority = 0, 558}; 559 560int tipc_bearer_setup(void) 561{ 562 int err; 563 564 err = register_netdevice_notifier(¬ifier); 565 if (err) 566 return err; 567 dev_add_pack(&tipc_packet_type); 568 return 0; 569} 570 571void tipc_bearer_cleanup(void) 572{ 573 unregister_netdevice_notifier(¬ifier); 574 dev_remove_pack(&tipc_packet_type); 575} 576 577void tipc_bearer_stop(struct net *net) 578{ 579 struct tipc_net *tn = net_generic(net, tipc_net_id); 580 struct tipc_bearer *b_ptr; 581 u32 i; 582 583 for (i = 0; i < MAX_BEARERS; i++) { 584 b_ptr = rtnl_dereference(tn->bearer_list[i]); 585 if (b_ptr) { 586 bearer_disable(net, b_ptr, true); 587 tn->bearer_list[i] = NULL; 588 } 589 } 590} 591 592/* Caller should hold rtnl_lock to protect the bearer */ 593static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 594 struct tipc_bearer *bearer, int nlflags) 595{ 596 void *hdr; 597 struct nlattr *attrs; 598 struct nlattr *prop; 599 600 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 601 nlflags, TIPC_NL_BEARER_GET); 602 if (!hdr) 603 return -EMSGSIZE; 604 605 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 606 if (!attrs) 607 goto msg_full; 608 609 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 610 goto attr_msg_full; 611 612 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 613 if (!prop) 614 goto prop_msg_full; 615 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 616 goto prop_msg_full; 617 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 618 goto prop_msg_full; 619 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 620 goto prop_msg_full; 621 622 nla_nest_end(msg->skb, prop); 623 nla_nest_end(msg->skb, attrs); 624 genlmsg_end(msg->skb, hdr); 625 626 return 0; 627 628prop_msg_full: 629 nla_nest_cancel(msg->skb, prop); 630attr_msg_full: 631 nla_nest_cancel(msg->skb, attrs); 632msg_full: 633 genlmsg_cancel(msg->skb, hdr); 634 635 return -EMSGSIZE; 636} 637 638int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 639{ 640 int err; 641 int i = cb->args[0]; 642 struct tipc_bearer *bearer; 643 struct tipc_nl_msg msg; 644 struct net *net = sock_net(skb->sk); 645 struct tipc_net *tn = net_generic(net, tipc_net_id); 646 647 if (i == MAX_BEARERS) 648 return 0; 649 650 msg.skb = skb; 651 msg.portid = NETLINK_CB(cb->skb).portid; 652 msg.seq = cb->nlh->nlmsg_seq; 653 654 rtnl_lock(); 655 for (i = 0; i < MAX_BEARERS; i++) { 656 bearer = rtnl_dereference(tn->bearer_list[i]); 657 if (!bearer) 658 continue; 659 660 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 661 if (err) 662 break; 663 } 664 rtnl_unlock(); 665 666 cb->args[0] = i; 667 return skb->len; 668} 669 670int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 671{ 672 int err; 673 char *name; 674 struct sk_buff *rep; 675 struct tipc_bearer *bearer; 676 struct tipc_nl_msg msg; 677 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 678 struct net *net = genl_info_net(info); 679 680 if (!info->attrs[TIPC_NLA_BEARER]) 681 return -EINVAL; 682 683 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 684 info->attrs[TIPC_NLA_BEARER], 685 tipc_nl_bearer_policy); 686 if (err) 687 return err; 688 689 if (!attrs[TIPC_NLA_BEARER_NAME]) 690 return -EINVAL; 691 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 692 693 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 694 if (!rep) 695 return -ENOMEM; 696 697 msg.skb = rep; 698 msg.portid = info->snd_portid; 699 msg.seq = info->snd_seq; 700 701 rtnl_lock(); 702 bearer = tipc_bearer_find(net, name); 703 if (!bearer) { 704 err = -EINVAL; 705 goto err_out; 706 } 707 708 err = __tipc_nl_add_bearer(&msg, bearer, 0); 709 if (err) 710 goto err_out; 711 rtnl_unlock(); 712 713 return genlmsg_reply(rep, info); 714err_out: 715 rtnl_unlock(); 716 nlmsg_free(rep); 717 718 return err; 719} 720 721int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 722{ 723 int err; 724 char *name; 725 struct tipc_bearer *bearer; 726 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 727 struct net *net = sock_net(skb->sk); 728 729 if (!info->attrs[TIPC_NLA_BEARER]) 730 return -EINVAL; 731 732 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 733 info->attrs[TIPC_NLA_BEARER], 734 tipc_nl_bearer_policy); 735 if (err) 736 return err; 737 738 if (!attrs[TIPC_NLA_BEARER_NAME]) 739 return -EINVAL; 740 741 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 742 743 rtnl_lock(); 744 bearer = tipc_bearer_find(net, name); 745 if (!bearer) { 746 rtnl_unlock(); 747 return -EINVAL; 748 } 749 750 bearer_disable(net, bearer, false); 751 rtnl_unlock(); 752 753 return 0; 754} 755 756int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 757{ 758 int err; 759 char *bearer; 760 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 761 struct net *net = sock_net(skb->sk); 762 struct tipc_net *tn = net_generic(net, tipc_net_id); 763 u32 domain; 764 u32 prio; 765 766 prio = TIPC_MEDIA_LINK_PRI; 767 domain = tn->own_addr & TIPC_CLUSTER_MASK; 768 769 if (!info->attrs[TIPC_NLA_BEARER]) 770 return -EINVAL; 771 772 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 773 info->attrs[TIPC_NLA_BEARER], 774 tipc_nl_bearer_policy); 775 if (err) 776 return err; 777 778 if (!attrs[TIPC_NLA_BEARER_NAME]) 779 return -EINVAL; 780 781 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 782 783 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 784 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 785 786 if (attrs[TIPC_NLA_BEARER_PROP]) { 787 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 788 789 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 790 props); 791 if (err) 792 return err; 793 794 if (props[TIPC_NLA_PROP_PRIO]) 795 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 796 } 797 798 rtnl_lock(); 799 err = tipc_enable_bearer(net, bearer, domain, prio, attrs); 800 if (err) { 801 rtnl_unlock(); 802 return err; 803 } 804 rtnl_unlock(); 805 806 return 0; 807} 808 809int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 810{ 811 int err; 812 char *name; 813 struct tipc_bearer *b; 814 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 815 struct net *net = genl_info_net(info); 816 817 if (!info->attrs[TIPC_NLA_BEARER]) 818 return -EINVAL; 819 820 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 821 info->attrs[TIPC_NLA_BEARER], 822 tipc_nl_bearer_policy); 823 if (err) 824 return err; 825 826 if (!attrs[TIPC_NLA_BEARER_NAME]) 827 return -EINVAL; 828 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 829 830 rtnl_lock(); 831 b = tipc_bearer_find(net, name); 832 if (!b) { 833 rtnl_unlock(); 834 return -EINVAL; 835 } 836 837 if (attrs[TIPC_NLA_BEARER_PROP]) { 838 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 839 840 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 841 props); 842 if (err) { 843 rtnl_unlock(); 844 return err; 845 } 846 847 if (props[TIPC_NLA_PROP_TOL]) 848 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 849 if (props[TIPC_NLA_PROP_PRIO]) 850 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 851 if (props[TIPC_NLA_PROP_WIN]) 852 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 853 } 854 rtnl_unlock(); 855 856 return 0; 857} 858 859static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 860 struct tipc_media *media, int nlflags) 861{ 862 void *hdr; 863 struct nlattr *attrs; 864 struct nlattr *prop; 865 866 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 867 nlflags, TIPC_NL_MEDIA_GET); 868 if (!hdr) 869 return -EMSGSIZE; 870 871 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 872 if (!attrs) 873 goto msg_full; 874 875 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 876 goto attr_msg_full; 877 878 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 879 if (!prop) 880 goto prop_msg_full; 881 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 882 goto prop_msg_full; 883 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 884 goto prop_msg_full; 885 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 886 goto prop_msg_full; 887 888 nla_nest_end(msg->skb, prop); 889 nla_nest_end(msg->skb, attrs); 890 genlmsg_end(msg->skb, hdr); 891 892 return 0; 893 894prop_msg_full: 895 nla_nest_cancel(msg->skb, prop); 896attr_msg_full: 897 nla_nest_cancel(msg->skb, attrs); 898msg_full: 899 genlmsg_cancel(msg->skb, hdr); 900 901 return -EMSGSIZE; 902} 903 904int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 905{ 906 int err; 907 int i = cb->args[0]; 908 struct tipc_nl_msg msg; 909 910 if (i == MAX_MEDIA) 911 return 0; 912 913 msg.skb = skb; 914 msg.portid = NETLINK_CB(cb->skb).portid; 915 msg.seq = cb->nlh->nlmsg_seq; 916 917 rtnl_lock(); 918 for (; media_info_array[i] != NULL; i++) { 919 err = __tipc_nl_add_media(&msg, media_info_array[i], 920 NLM_F_MULTI); 921 if (err) 922 break; 923 } 924 rtnl_unlock(); 925 926 cb->args[0] = i; 927 return skb->len; 928} 929 930int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 931{ 932 int err; 933 char *name; 934 struct tipc_nl_msg msg; 935 struct tipc_media *media; 936 struct sk_buff *rep; 937 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 938 939 if (!info->attrs[TIPC_NLA_MEDIA]) 940 return -EINVAL; 941 942 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 943 info->attrs[TIPC_NLA_MEDIA], 944 tipc_nl_media_policy); 945 if (err) 946 return err; 947 948 if (!attrs[TIPC_NLA_MEDIA_NAME]) 949 return -EINVAL; 950 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 951 952 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 953 if (!rep) 954 return -ENOMEM; 955 956 msg.skb = rep; 957 msg.portid = info->snd_portid; 958 msg.seq = info->snd_seq; 959 960 rtnl_lock(); 961 media = tipc_media_find(name); 962 if (!media) { 963 err = -EINVAL; 964 goto err_out; 965 } 966 967 err = __tipc_nl_add_media(&msg, media, 0); 968 if (err) 969 goto err_out; 970 rtnl_unlock(); 971 972 return genlmsg_reply(rep, info); 973err_out: 974 rtnl_unlock(); 975 nlmsg_free(rep); 976 977 return err; 978} 979 980int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 981{ 982 int err; 983 char *name; 984 struct tipc_media *m; 985 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 986 987 if (!info->attrs[TIPC_NLA_MEDIA]) 988 return -EINVAL; 989 990 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 991 info->attrs[TIPC_NLA_MEDIA], 992 tipc_nl_media_policy); 993 994 if (!attrs[TIPC_NLA_MEDIA_NAME]) 995 return -EINVAL; 996 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 997 998 rtnl_lock(); 999 m = tipc_media_find(name); 1000 if (!m) { 1001 rtnl_unlock(); 1002 return -EINVAL; 1003 } 1004 1005 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1006 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1007 1008 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1009 props); 1010 if (err) { 1011 rtnl_unlock(); 1012 return err; 1013 } 1014 1015 if (props[TIPC_NLA_PROP_TOL]) 1016 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1017 if (props[TIPC_NLA_PROP_PRIO]) 1018 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1019 if (props[TIPC_NLA_PROP_WIN]) 1020 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1021 } 1022 rtnl_unlock(); 1023 1024 return 0; 1025} 1026