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_disc_add_dest(b_ptr->link_req); 198 rcu_read_unlock(); 199 } 200 201 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) 202 { 203 struct tipc_net *tn = net_generic(net, tipc_net_id); 204 struct tipc_bearer *b_ptr; 205 206 rcu_read_lock(); 207 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 208 if (b_ptr) 209 tipc_disc_remove_dest(b_ptr->link_req); 210 rcu_read_unlock(); 211 } 212 213 /** 214 * tipc_enable_bearer - enable bearer with the given name 215 */ 216 static int tipc_enable_bearer(struct net *net, const char *name, 217 u32 disc_domain, u32 priority, 218 struct nlattr *attr[]) 219 { 220 struct tipc_net *tn = net_generic(net, tipc_net_id); 221 struct tipc_bearer *b_ptr; 222 struct tipc_media *m_ptr; 223 struct tipc_bearer_names b_names; 224 char addr_string[16]; 225 u32 bearer_id; 226 u32 with_this_prio; 227 u32 i; 228 int res = -EINVAL; 229 230 if (!tn->own_addr) { 231 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", 232 name); 233 return -ENOPROTOOPT; 234 } 235 if (!bearer_name_validate(name, &b_names)) { 236 pr_warn("Bearer <%s> rejected, illegal name\n", name); 237 return -EINVAL; 238 } 239 if (tipc_addr_domain_valid(disc_domain) && 240 (disc_domain != tn->own_addr)) { 241 if (tipc_in_scope(disc_domain, tn->own_addr)) { 242 disc_domain = tn->own_addr & TIPC_CLUSTER_MASK; 243 res = 0; /* accept any node in own cluster */ 244 } else if (in_own_cluster_exact(net, disc_domain)) 245 res = 0; /* accept specified node in own cluster */ 246 } 247 if (res) { 248 pr_warn("Bearer <%s> rejected, illegal discovery domain\n", 249 name); 250 return -EINVAL; 251 } 252 if ((priority > TIPC_MAX_LINK_PRI) && 253 (priority != TIPC_MEDIA_LINK_PRI)) { 254 pr_warn("Bearer <%s> rejected, illegal priority\n", name); 255 return -EINVAL; 256 } 257 258 m_ptr = tipc_media_find(b_names.media_name); 259 if (!m_ptr) { 260 pr_warn("Bearer <%s> rejected, media <%s> not registered\n", 261 name, b_names.media_name); 262 return -EINVAL; 263 } 264 265 if (priority == TIPC_MEDIA_LINK_PRI) 266 priority = m_ptr->priority; 267 268 restart: 269 bearer_id = MAX_BEARERS; 270 with_this_prio = 1; 271 for (i = MAX_BEARERS; i-- != 0; ) { 272 b_ptr = rtnl_dereference(tn->bearer_list[i]); 273 if (!b_ptr) { 274 bearer_id = i; 275 continue; 276 } 277 if (!strcmp(name, b_ptr->name)) { 278 pr_warn("Bearer <%s> rejected, already enabled\n", 279 name); 280 return -EINVAL; 281 } 282 if ((b_ptr->priority == priority) && 283 (++with_this_prio > 2)) { 284 if (priority-- == 0) { 285 pr_warn("Bearer <%s> rejected, duplicate priority\n", 286 name); 287 return -EINVAL; 288 } 289 pr_warn("Bearer <%s> priority adjustment required %u->%u\n", 290 name, priority + 1, priority); 291 goto restart; 292 } 293 } 294 if (bearer_id >= MAX_BEARERS) { 295 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", 296 name, MAX_BEARERS); 297 return -EINVAL; 298 } 299 300 b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC); 301 if (!b_ptr) 302 return -ENOMEM; 303 304 strcpy(b_ptr->name, name); 305 b_ptr->media = m_ptr; 306 res = m_ptr->enable_media(net, b_ptr, attr); 307 if (res) { 308 pr_warn("Bearer <%s> rejected, enable failure (%d)\n", 309 name, -res); 310 return -EINVAL; 311 } 312 313 b_ptr->identity = bearer_id; 314 b_ptr->tolerance = m_ptr->tolerance; 315 b_ptr->window = m_ptr->window; 316 b_ptr->domain = disc_domain; 317 b_ptr->net_plane = bearer_id + 'A'; 318 b_ptr->priority = priority; 319 320 res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr); 321 if (res) { 322 bearer_disable(net, b_ptr); 323 pr_warn("Bearer <%s> rejected, discovery object creation failed\n", 324 name); 325 return -EINVAL; 326 } 327 328 rcu_assign_pointer(tn->bearer_list[bearer_id], b_ptr); 329 330 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", 331 name, 332 tipc_addr_string_fill(addr_string, disc_domain), priority); 333 return res; 334 } 335 336 /** 337 * tipc_reset_bearer - Reset all links established over this bearer 338 */ 339 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr) 340 { 341 pr_info("Resetting bearer <%s>\n", b_ptr->name); 342 tipc_node_delete_links(net, b_ptr->identity); 343 tipc_disc_reset(net, b_ptr); 344 return 0; 345 } 346 347 /** 348 * bearer_disable 349 * 350 * Note: This routine assumes caller holds RTNL lock. 351 */ 352 static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr) 353 { 354 struct tipc_net *tn = net_generic(net, tipc_net_id); 355 u32 i; 356 357 pr_info("Disabling bearer <%s>\n", b_ptr->name); 358 b_ptr->media->disable_media(b_ptr); 359 360 tipc_node_delete_links(net, b_ptr->identity); 361 RCU_INIT_POINTER(b_ptr->media_ptr, NULL); 362 if (b_ptr->link_req) 363 tipc_disc_delete(b_ptr->link_req); 364 365 for (i = 0; i < MAX_BEARERS; i++) { 366 if (b_ptr == rtnl_dereference(tn->bearer_list[i])) { 367 RCU_INIT_POINTER(tn->bearer_list[i], NULL); 368 break; 369 } 370 } 371 kfree_rcu(b_ptr, rcu); 372 } 373 374 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 375 struct nlattr *attr[]) 376 { 377 struct net_device *dev; 378 char *driver_name = strchr((const char *)b->name, ':') + 1; 379 380 /* Find device with specified name */ 381 dev = dev_get_by_name(net, driver_name); 382 if (!dev) 383 return -ENODEV; 384 385 /* Associate TIPC bearer with L2 bearer */ 386 rcu_assign_pointer(b->media_ptr, dev); 387 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 388 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); 389 b->bcast_addr.media_id = b->media->type_id; 390 b->bcast_addr.broadcast = 1; 391 b->mtu = dev->mtu; 392 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 393 rcu_assign_pointer(dev->tipc_ptr, b); 394 return 0; 395 } 396 397 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 398 * 399 * Mark L2 bearer as inactive so that incoming buffers are thrown away 400 */ 401 void tipc_disable_l2_media(struct tipc_bearer *b) 402 { 403 struct net_device *dev; 404 405 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 406 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 407 synchronize_net(); 408 dev_put(dev); 409 } 410 411 /** 412 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 413 * @buf: the packet to be sent 414 * @b_ptr: the bearer through which the packet is to be sent 415 * @dest: peer destination address 416 */ 417 int tipc_l2_send_msg(struct net *net, struct sk_buff *buf, 418 struct tipc_bearer *b, struct tipc_media_addr *dest) 419 { 420 struct sk_buff *clone; 421 struct net_device *dev; 422 int delta; 423 424 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 425 if (!dev) 426 return 0; 427 428 clone = skb_clone(buf, GFP_ATOMIC); 429 if (!clone) 430 return 0; 431 432 delta = dev->hard_header_len - skb_headroom(buf); 433 if ((delta > 0) && 434 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { 435 kfree_skb(clone); 436 return 0; 437 } 438 439 skb_reset_network_header(clone); 440 clone->dev = dev; 441 clone->protocol = htons(ETH_P_TIPC); 442 dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, 443 dev->dev_addr, clone->len); 444 dev_queue_xmit(clone); 445 return 0; 446 } 447 448 /* tipc_bearer_send- sends buffer to destination over bearer 449 * 450 * IMPORTANT: 451 * The media send routine must not alter the buffer being passed in 452 * as it may be needed for later retransmission! 453 */ 454 void tipc_bearer_send(struct net *net, u32 bearer_id, struct sk_buff *buf, 455 struct tipc_media_addr *dest) 456 { 457 struct tipc_net *tn = net_generic(net, tipc_net_id); 458 struct tipc_bearer *b_ptr; 459 460 rcu_read_lock(); 461 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 462 if (likely(b_ptr)) 463 b_ptr->media->send_msg(net, buf, b_ptr, dest); 464 rcu_read_unlock(); 465 } 466 467 /* tipc_bearer_xmit() -send buffer to destination over bearer 468 */ 469 void tipc_bearer_xmit(struct net *net, u32 bearer_id, 470 struct sk_buff_head *xmitq, 471 struct tipc_media_addr *dst) 472 { 473 struct tipc_net *tn = net_generic(net, tipc_net_id); 474 struct tipc_bearer *b; 475 struct sk_buff *skb, *tmp; 476 477 if (skb_queue_empty(xmitq)) 478 return; 479 480 rcu_read_lock(); 481 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 482 if (likely(b)) { 483 skb_queue_walk_safe(xmitq, skb, tmp) { 484 __skb_dequeue(xmitq); 485 b->media->send_msg(net, skb, b, dst); 486 /* Until we remove cloning in tipc_l2_send_msg(): */ 487 kfree_skb(skb); 488 } 489 } 490 rcu_read_unlock(); 491 } 492 493 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations 494 */ 495 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 496 struct sk_buff_head *xmitq) 497 { 498 struct tipc_net *tn = tipc_net(net); 499 int net_id = tn->net_id; 500 struct tipc_bearer *b; 501 struct sk_buff *skb, *tmp; 502 struct tipc_msg *hdr; 503 504 rcu_read_lock(); 505 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 506 if (likely(b)) { 507 skb_queue_walk_safe(xmitq, skb, tmp) { 508 hdr = buf_msg(skb); 509 msg_set_non_seq(hdr, 1); 510 msg_set_mc_netid(hdr, net_id); 511 __skb_dequeue(xmitq); 512 b->media->send_msg(net, skb, b, &b->bcast_addr); 513 /* Until we remove cloning in tipc_l2_send_msg(): */ 514 kfree_skb(skb); 515 } 516 } 517 rcu_read_unlock(); 518 } 519 520 /** 521 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 522 * @buf: the received packet 523 * @dev: the net device that the packet was received on 524 * @pt: the packet_type structure which was used to register this handler 525 * @orig_dev: the original receive net device in case the device is a bond 526 * 527 * Accept only packets explicitly sent to this node, or broadcast packets; 528 * ignores packets sent using interface multicast, and traffic sent to other 529 * nodes (which can happen if interface is running in promiscuous mode). 530 */ 531 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev, 532 struct packet_type *pt, struct net_device *orig_dev) 533 { 534 struct tipc_bearer *b_ptr; 535 536 rcu_read_lock(); 537 b_ptr = rcu_dereference_rtnl(dev->tipc_ptr); 538 if (likely(b_ptr)) { 539 if (likely(buf->pkt_type <= PACKET_BROADCAST)) { 540 buf->next = NULL; 541 tipc_rcv(dev_net(dev), buf, b_ptr); 542 rcu_read_unlock(); 543 return NET_RX_SUCCESS; 544 } 545 } 546 rcu_read_unlock(); 547 548 kfree_skb(buf); 549 return NET_RX_DROP; 550 } 551 552 /** 553 * tipc_l2_device_event - handle device events from network device 554 * @nb: the context of the notification 555 * @evt: the type of event 556 * @ptr: the net device that the event was on 557 * 558 * This function is called by the Ethernet driver in case of link 559 * change event. 560 */ 561 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 562 void *ptr) 563 { 564 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 565 struct net *net = dev_net(dev); 566 struct tipc_bearer *b_ptr; 567 568 b_ptr = rtnl_dereference(dev->tipc_ptr); 569 if (!b_ptr) 570 return NOTIFY_DONE; 571 572 b_ptr->mtu = dev->mtu; 573 574 switch (evt) { 575 case NETDEV_CHANGE: 576 if (netif_carrier_ok(dev)) 577 break; 578 case NETDEV_GOING_DOWN: 579 case NETDEV_CHANGEMTU: 580 tipc_reset_bearer(net, b_ptr); 581 break; 582 case NETDEV_CHANGEADDR: 583 b_ptr->media->raw2addr(b_ptr, &b_ptr->addr, 584 (char *)dev->dev_addr); 585 tipc_reset_bearer(net, b_ptr); 586 break; 587 case NETDEV_UNREGISTER: 588 case NETDEV_CHANGENAME: 589 bearer_disable(dev_net(dev), b_ptr); 590 break; 591 } 592 return NOTIFY_OK; 593 } 594 595 static struct packet_type tipc_packet_type __read_mostly = { 596 .type = htons(ETH_P_TIPC), 597 .func = tipc_l2_rcv_msg, 598 }; 599 600 static struct notifier_block notifier = { 601 .notifier_call = tipc_l2_device_event, 602 .priority = 0, 603 }; 604 605 int tipc_bearer_setup(void) 606 { 607 int err; 608 609 err = register_netdevice_notifier(¬ifier); 610 if (err) 611 return err; 612 dev_add_pack(&tipc_packet_type); 613 return 0; 614 } 615 616 void tipc_bearer_cleanup(void) 617 { 618 unregister_netdevice_notifier(¬ifier); 619 dev_remove_pack(&tipc_packet_type); 620 } 621 622 void tipc_bearer_stop(struct net *net) 623 { 624 struct tipc_net *tn = net_generic(net, tipc_net_id); 625 struct tipc_bearer *b_ptr; 626 u32 i; 627 628 for (i = 0; i < MAX_BEARERS; i++) { 629 b_ptr = rtnl_dereference(tn->bearer_list[i]); 630 if (b_ptr) { 631 bearer_disable(net, b_ptr); 632 tn->bearer_list[i] = NULL; 633 } 634 } 635 } 636 637 /* Caller should hold rtnl_lock to protect the bearer */ 638 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 639 struct tipc_bearer *bearer, int nlflags) 640 { 641 void *hdr; 642 struct nlattr *attrs; 643 struct nlattr *prop; 644 645 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 646 nlflags, TIPC_NL_BEARER_GET); 647 if (!hdr) 648 return -EMSGSIZE; 649 650 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 651 if (!attrs) 652 goto msg_full; 653 654 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 655 goto attr_msg_full; 656 657 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 658 if (!prop) 659 goto prop_msg_full; 660 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 661 goto prop_msg_full; 662 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 663 goto prop_msg_full; 664 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 665 goto prop_msg_full; 666 667 nla_nest_end(msg->skb, prop); 668 nla_nest_end(msg->skb, attrs); 669 genlmsg_end(msg->skb, hdr); 670 671 return 0; 672 673 prop_msg_full: 674 nla_nest_cancel(msg->skb, prop); 675 attr_msg_full: 676 nla_nest_cancel(msg->skb, attrs); 677 msg_full: 678 genlmsg_cancel(msg->skb, hdr); 679 680 return -EMSGSIZE; 681 } 682 683 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 684 { 685 int err; 686 int i = cb->args[0]; 687 struct tipc_bearer *bearer; 688 struct tipc_nl_msg msg; 689 struct net *net = sock_net(skb->sk); 690 struct tipc_net *tn = net_generic(net, tipc_net_id); 691 692 if (i == MAX_BEARERS) 693 return 0; 694 695 msg.skb = skb; 696 msg.portid = NETLINK_CB(cb->skb).portid; 697 msg.seq = cb->nlh->nlmsg_seq; 698 699 rtnl_lock(); 700 for (i = 0; i < MAX_BEARERS; i++) { 701 bearer = rtnl_dereference(tn->bearer_list[i]); 702 if (!bearer) 703 continue; 704 705 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 706 if (err) 707 break; 708 } 709 rtnl_unlock(); 710 711 cb->args[0] = i; 712 return skb->len; 713 } 714 715 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 716 { 717 int err; 718 char *name; 719 struct sk_buff *rep; 720 struct tipc_bearer *bearer; 721 struct tipc_nl_msg msg; 722 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 723 struct net *net = genl_info_net(info); 724 725 if (!info->attrs[TIPC_NLA_BEARER]) 726 return -EINVAL; 727 728 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 729 info->attrs[TIPC_NLA_BEARER], 730 tipc_nl_bearer_policy); 731 if (err) 732 return err; 733 734 if (!attrs[TIPC_NLA_BEARER_NAME]) 735 return -EINVAL; 736 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 737 738 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 739 if (!rep) 740 return -ENOMEM; 741 742 msg.skb = rep; 743 msg.portid = info->snd_portid; 744 msg.seq = info->snd_seq; 745 746 rtnl_lock(); 747 bearer = tipc_bearer_find(net, name); 748 if (!bearer) { 749 err = -EINVAL; 750 goto err_out; 751 } 752 753 err = __tipc_nl_add_bearer(&msg, bearer, 0); 754 if (err) 755 goto err_out; 756 rtnl_unlock(); 757 758 return genlmsg_reply(rep, info); 759 err_out: 760 rtnl_unlock(); 761 nlmsg_free(rep); 762 763 return err; 764 } 765 766 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 767 { 768 int err; 769 char *name; 770 struct tipc_bearer *bearer; 771 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 772 struct net *net = sock_net(skb->sk); 773 774 if (!info->attrs[TIPC_NLA_BEARER]) 775 return -EINVAL; 776 777 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 778 info->attrs[TIPC_NLA_BEARER], 779 tipc_nl_bearer_policy); 780 if (err) 781 return err; 782 783 if (!attrs[TIPC_NLA_BEARER_NAME]) 784 return -EINVAL; 785 786 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 787 788 rtnl_lock(); 789 bearer = tipc_bearer_find(net, name); 790 if (!bearer) { 791 rtnl_unlock(); 792 return -EINVAL; 793 } 794 795 bearer_disable(net, bearer); 796 rtnl_unlock(); 797 798 return 0; 799 } 800 801 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 802 { 803 int err; 804 char *bearer; 805 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 806 struct net *net = sock_net(skb->sk); 807 struct tipc_net *tn = net_generic(net, tipc_net_id); 808 u32 domain; 809 u32 prio; 810 811 prio = TIPC_MEDIA_LINK_PRI; 812 domain = tn->own_addr & TIPC_CLUSTER_MASK; 813 814 if (!info->attrs[TIPC_NLA_BEARER]) 815 return -EINVAL; 816 817 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 818 info->attrs[TIPC_NLA_BEARER], 819 tipc_nl_bearer_policy); 820 if (err) 821 return err; 822 823 if (!attrs[TIPC_NLA_BEARER_NAME]) 824 return -EINVAL; 825 826 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 827 828 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 829 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 830 831 if (attrs[TIPC_NLA_BEARER_PROP]) { 832 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 833 834 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 835 props); 836 if (err) 837 return err; 838 839 if (props[TIPC_NLA_PROP_PRIO]) 840 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 841 } 842 843 rtnl_lock(); 844 err = tipc_enable_bearer(net, bearer, domain, prio, attrs); 845 if (err) { 846 rtnl_unlock(); 847 return err; 848 } 849 rtnl_unlock(); 850 851 return 0; 852 } 853 854 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 855 { 856 int err; 857 char *name; 858 struct tipc_bearer *b; 859 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 860 struct net *net = sock_net(skb->sk); 861 862 if (!info->attrs[TIPC_NLA_BEARER]) 863 return -EINVAL; 864 865 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 866 info->attrs[TIPC_NLA_BEARER], 867 tipc_nl_bearer_policy); 868 if (err) 869 return err; 870 871 if (!attrs[TIPC_NLA_BEARER_NAME]) 872 return -EINVAL; 873 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 874 875 rtnl_lock(); 876 b = tipc_bearer_find(net, name); 877 if (!b) { 878 rtnl_unlock(); 879 return -EINVAL; 880 } 881 882 if (attrs[TIPC_NLA_BEARER_PROP]) { 883 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 884 885 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 886 props); 887 if (err) { 888 rtnl_unlock(); 889 return err; 890 } 891 892 if (props[TIPC_NLA_PROP_TOL]) 893 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 894 if (props[TIPC_NLA_PROP_PRIO]) 895 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 896 if (props[TIPC_NLA_PROP_WIN]) 897 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 898 } 899 rtnl_unlock(); 900 901 return 0; 902 } 903 904 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 905 struct tipc_media *media, int nlflags) 906 { 907 void *hdr; 908 struct nlattr *attrs; 909 struct nlattr *prop; 910 911 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 912 nlflags, TIPC_NL_MEDIA_GET); 913 if (!hdr) 914 return -EMSGSIZE; 915 916 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 917 if (!attrs) 918 goto msg_full; 919 920 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 921 goto attr_msg_full; 922 923 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 924 if (!prop) 925 goto prop_msg_full; 926 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 927 goto prop_msg_full; 928 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 929 goto prop_msg_full; 930 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 931 goto prop_msg_full; 932 933 nla_nest_end(msg->skb, prop); 934 nla_nest_end(msg->skb, attrs); 935 genlmsg_end(msg->skb, hdr); 936 937 return 0; 938 939 prop_msg_full: 940 nla_nest_cancel(msg->skb, prop); 941 attr_msg_full: 942 nla_nest_cancel(msg->skb, attrs); 943 msg_full: 944 genlmsg_cancel(msg->skb, hdr); 945 946 return -EMSGSIZE; 947 } 948 949 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 950 { 951 int err; 952 int i = cb->args[0]; 953 struct tipc_nl_msg msg; 954 955 if (i == MAX_MEDIA) 956 return 0; 957 958 msg.skb = skb; 959 msg.portid = NETLINK_CB(cb->skb).portid; 960 msg.seq = cb->nlh->nlmsg_seq; 961 962 rtnl_lock(); 963 for (; media_info_array[i] != NULL; i++) { 964 err = __tipc_nl_add_media(&msg, media_info_array[i], 965 NLM_F_MULTI); 966 if (err) 967 break; 968 } 969 rtnl_unlock(); 970 971 cb->args[0] = i; 972 return skb->len; 973 } 974 975 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 976 { 977 int err; 978 char *name; 979 struct tipc_nl_msg msg; 980 struct tipc_media *media; 981 struct sk_buff *rep; 982 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 983 984 if (!info->attrs[TIPC_NLA_MEDIA]) 985 return -EINVAL; 986 987 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 988 info->attrs[TIPC_NLA_MEDIA], 989 tipc_nl_media_policy); 990 if (err) 991 return err; 992 993 if (!attrs[TIPC_NLA_MEDIA_NAME]) 994 return -EINVAL; 995 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 996 997 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 998 if (!rep) 999 return -ENOMEM; 1000 1001 msg.skb = rep; 1002 msg.portid = info->snd_portid; 1003 msg.seq = info->snd_seq; 1004 1005 rtnl_lock(); 1006 media = tipc_media_find(name); 1007 if (!media) { 1008 err = -EINVAL; 1009 goto err_out; 1010 } 1011 1012 err = __tipc_nl_add_media(&msg, media, 0); 1013 if (err) 1014 goto err_out; 1015 rtnl_unlock(); 1016 1017 return genlmsg_reply(rep, info); 1018 err_out: 1019 rtnl_unlock(); 1020 nlmsg_free(rep); 1021 1022 return err; 1023 } 1024 1025 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1026 { 1027 int err; 1028 char *name; 1029 struct tipc_media *m; 1030 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1031 1032 if (!info->attrs[TIPC_NLA_MEDIA]) 1033 return -EINVAL; 1034 1035 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1036 info->attrs[TIPC_NLA_MEDIA], 1037 tipc_nl_media_policy); 1038 1039 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1040 return -EINVAL; 1041 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1042 1043 rtnl_lock(); 1044 m = tipc_media_find(name); 1045 if (!m) { 1046 rtnl_unlock(); 1047 return -EINVAL; 1048 } 1049 1050 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1051 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1052 1053 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1054 props); 1055 if (err) { 1056 rtnl_unlock(); 1057 return err; 1058 } 1059 1060 if (props[TIPC_NLA_PROP_TOL]) 1061 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1062 if (props[TIPC_NLA_PROP_PRIO]) 1063 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1064 if (props[TIPC_NLA_PROP_WIN]) 1065 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1066 } 1067 rtnl_unlock(); 1068 1069 return 0; 1070 } 1071