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 #include "netlink.h" 44 45 #define MAX_ADDR_STR 60 46 47 static struct tipc_media * const media_info_array[] = { 48 ð_media_info, 49 #ifdef CONFIG_TIPC_MEDIA_IB 50 &ib_media_info, 51 #endif 52 #ifdef CONFIG_TIPC_MEDIA_UDP 53 &udp_media_info, 54 #endif 55 NULL 56 }; 57 58 static void bearer_disable(struct net *net, struct tipc_bearer *b); 59 60 /** 61 * tipc_media_find - locates specified media object by name 62 */ 63 struct tipc_media *tipc_media_find(const char *name) 64 { 65 u32 i; 66 67 for (i = 0; media_info_array[i] != NULL; i++) { 68 if (!strcmp(media_info_array[i]->name, name)) 69 break; 70 } 71 return media_info_array[i]; 72 } 73 74 /** 75 * media_find_id - locates specified media object by type identifier 76 */ 77 static struct tipc_media *media_find_id(u8 type) 78 { 79 u32 i; 80 81 for (i = 0; media_info_array[i] != NULL; i++) { 82 if (media_info_array[i]->type_id == type) 83 break; 84 } 85 return media_info_array[i]; 86 } 87 88 /** 89 * tipc_media_addr_printf - record media address in print buffer 90 */ 91 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) 92 { 93 char addr_str[MAX_ADDR_STR]; 94 struct tipc_media *m; 95 int ret; 96 97 m = media_find_id(a->media_id); 98 99 if (m && !m->addr2str(a, addr_str, sizeof(addr_str))) 100 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str); 101 else { 102 u32 i; 103 104 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); 105 for (i = 0; i < sizeof(a->value); i++) 106 ret += scnprintf(buf - ret, len + ret, 107 "-%02x", a->value[i]); 108 } 109 } 110 111 /** 112 * bearer_name_validate - validate & (optionally) deconstruct bearer name 113 * @name: ptr to bearer name string 114 * @name_parts: ptr to area for bearer name components (or NULL if not needed) 115 * 116 * Returns 1 if bearer name is valid, otherwise 0. 117 */ 118 static int bearer_name_validate(const char *name, 119 struct tipc_bearer_names *name_parts) 120 { 121 char name_copy[TIPC_MAX_BEARER_NAME]; 122 char *media_name; 123 char *if_name; 124 u32 media_len; 125 u32 if_len; 126 127 /* copy bearer name & ensure length is OK */ 128 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; 129 /* need above in case non-Posix strncpy() doesn't pad with nulls */ 130 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); 131 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) 132 return 0; 133 134 /* ensure all component parts of bearer name are present */ 135 media_name = name_copy; 136 if_name = strchr(media_name, ':'); 137 if (if_name == NULL) 138 return 0; 139 *(if_name++) = 0; 140 media_len = if_name - media_name; 141 if_len = strlen(if_name) + 1; 142 143 /* validate component parts of bearer name */ 144 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || 145 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) 146 return 0; 147 148 /* return bearer name components, if necessary */ 149 if (name_parts) { 150 strcpy(name_parts->media_name, media_name); 151 strcpy(name_parts->if_name, if_name); 152 } 153 return 1; 154 } 155 156 /** 157 * tipc_bearer_find - locates bearer object with matching bearer name 158 */ 159 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) 160 { 161 struct tipc_net *tn = net_generic(net, tipc_net_id); 162 struct tipc_bearer *b; 163 u32 i; 164 165 for (i = 0; i < MAX_BEARERS; i++) { 166 b = rtnl_dereference(tn->bearer_list[i]); 167 if (b && (!strcmp(b->name, name))) 168 return b; 169 } 170 return NULL; 171 } 172 173 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) 174 { 175 struct tipc_net *tn = net_generic(net, tipc_net_id); 176 struct tipc_bearer *b; 177 178 rcu_read_lock(); 179 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 180 if (b) 181 tipc_disc_add_dest(b->link_req); 182 rcu_read_unlock(); 183 } 184 185 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) 186 { 187 struct tipc_net *tn = net_generic(net, tipc_net_id); 188 struct tipc_bearer *b; 189 190 rcu_read_lock(); 191 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 192 if (b) 193 tipc_disc_remove_dest(b->link_req); 194 rcu_read_unlock(); 195 } 196 197 /** 198 * tipc_enable_bearer - enable bearer with the given name 199 */ 200 static int tipc_enable_bearer(struct net *net, const char *name, 201 u32 disc_domain, u32 priority, 202 struct nlattr *attr[]) 203 { 204 struct tipc_net *tn = net_generic(net, tipc_net_id); 205 struct tipc_bearer *b; 206 struct tipc_media *m; 207 struct tipc_bearer_names b_names; 208 char addr_string[16]; 209 u32 bearer_id; 210 u32 with_this_prio; 211 u32 i; 212 int res = -EINVAL; 213 214 if (!tn->own_addr) { 215 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", 216 name); 217 return -ENOPROTOOPT; 218 } 219 if (!bearer_name_validate(name, &b_names)) { 220 pr_warn("Bearer <%s> rejected, illegal name\n", name); 221 return -EINVAL; 222 } 223 if (tipc_addr_domain_valid(disc_domain) && 224 (disc_domain != tn->own_addr)) { 225 if (tipc_in_scope(disc_domain, tn->own_addr)) { 226 disc_domain = tn->own_addr & TIPC_CLUSTER_MASK; 227 res = 0; /* accept any node in own cluster */ 228 } else if (in_own_cluster_exact(net, disc_domain)) 229 res = 0; /* accept specified node in own cluster */ 230 } 231 if (res) { 232 pr_warn("Bearer <%s> rejected, illegal discovery domain\n", 233 name); 234 return -EINVAL; 235 } 236 if ((priority > TIPC_MAX_LINK_PRI) && 237 (priority != TIPC_MEDIA_LINK_PRI)) { 238 pr_warn("Bearer <%s> rejected, illegal priority\n", name); 239 return -EINVAL; 240 } 241 242 m = tipc_media_find(b_names.media_name); 243 if (!m) { 244 pr_warn("Bearer <%s> rejected, media <%s> not registered\n", 245 name, b_names.media_name); 246 return -EINVAL; 247 } 248 249 if (priority == TIPC_MEDIA_LINK_PRI) 250 priority = m->priority; 251 252 restart: 253 bearer_id = MAX_BEARERS; 254 with_this_prio = 1; 255 for (i = MAX_BEARERS; i-- != 0; ) { 256 b = rtnl_dereference(tn->bearer_list[i]); 257 if (!b) { 258 bearer_id = i; 259 continue; 260 } 261 if (!strcmp(name, b->name)) { 262 pr_warn("Bearer <%s> rejected, already enabled\n", 263 name); 264 return -EINVAL; 265 } 266 if ((b->priority == priority) && 267 (++with_this_prio > 2)) { 268 if (priority-- == 0) { 269 pr_warn("Bearer <%s> rejected, duplicate priority\n", 270 name); 271 return -EINVAL; 272 } 273 pr_warn("Bearer <%s> priority adjustment required %u->%u\n", 274 name, priority + 1, priority); 275 goto restart; 276 } 277 } 278 if (bearer_id >= MAX_BEARERS) { 279 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", 280 name, MAX_BEARERS); 281 return -EINVAL; 282 } 283 284 b = kzalloc(sizeof(*b), GFP_ATOMIC); 285 if (!b) 286 return -ENOMEM; 287 288 strcpy(b->name, name); 289 b->media = m; 290 res = m->enable_media(net, b, attr); 291 if (res) { 292 pr_warn("Bearer <%s> rejected, enable failure (%d)\n", 293 name, -res); 294 return -EINVAL; 295 } 296 297 b->identity = bearer_id; 298 b->tolerance = m->tolerance; 299 b->window = m->window; 300 b->domain = disc_domain; 301 b->net_plane = bearer_id + 'A'; 302 b->priority = priority; 303 304 res = tipc_disc_create(net, b, &b->bcast_addr); 305 if (res) { 306 bearer_disable(net, b); 307 pr_warn("Bearer <%s> rejected, discovery object creation failed\n", 308 name); 309 return -EINVAL; 310 } 311 312 rcu_assign_pointer(tn->bearer_list[bearer_id], b); 313 314 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", 315 name, 316 tipc_addr_string_fill(addr_string, disc_domain), priority); 317 return res; 318 } 319 320 /** 321 * tipc_reset_bearer - Reset all links established over this bearer 322 */ 323 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) 324 { 325 pr_info("Resetting bearer <%s>\n", b->name); 326 tipc_node_delete_links(net, b->identity); 327 tipc_disc_reset(net, b); 328 return 0; 329 } 330 331 /** 332 * bearer_disable 333 * 334 * Note: This routine assumes caller holds RTNL lock. 335 */ 336 static void bearer_disable(struct net *net, struct tipc_bearer *b) 337 { 338 struct tipc_net *tn = net_generic(net, tipc_net_id); 339 u32 i; 340 341 pr_info("Disabling bearer <%s>\n", b->name); 342 b->media->disable_media(b); 343 344 tipc_node_delete_links(net, b->identity); 345 RCU_INIT_POINTER(b->media_ptr, NULL); 346 if (b->link_req) 347 tipc_disc_delete(b->link_req); 348 349 for (i = 0; i < MAX_BEARERS; i++) { 350 if (b == rtnl_dereference(tn->bearer_list[i])) { 351 RCU_INIT_POINTER(tn->bearer_list[i], NULL); 352 break; 353 } 354 } 355 kfree_rcu(b, rcu); 356 } 357 358 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 359 struct nlattr *attr[]) 360 { 361 struct net_device *dev; 362 char *driver_name = strchr((const char *)b->name, ':') + 1; 363 364 /* Find device with specified name */ 365 dev = dev_get_by_name(net, driver_name); 366 if (!dev) 367 return -ENODEV; 368 369 /* Associate TIPC bearer with L2 bearer */ 370 rcu_assign_pointer(b->media_ptr, dev); 371 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 372 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); 373 b->bcast_addr.media_id = b->media->type_id; 374 b->bcast_addr.broadcast = 1; 375 b->mtu = dev->mtu; 376 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 377 rcu_assign_pointer(dev->tipc_ptr, b); 378 return 0; 379 } 380 381 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 382 * 383 * Mark L2 bearer as inactive so that incoming buffers are thrown away 384 */ 385 void tipc_disable_l2_media(struct tipc_bearer *b) 386 { 387 struct net_device *dev; 388 389 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 390 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 391 synchronize_net(); 392 dev_put(dev); 393 } 394 395 /** 396 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 397 * @buf: the packet to be sent 398 * @b: the bearer through which the packet is to be sent 399 * @dest: peer destination address 400 */ 401 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, 402 struct tipc_bearer *b, struct tipc_media_addr *dest) 403 { 404 struct net_device *dev; 405 int delta; 406 407 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 408 if (!dev) 409 return 0; 410 411 delta = dev->hard_header_len - skb_headroom(skb); 412 if ((delta > 0) && 413 pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { 414 kfree_skb(skb); 415 return 0; 416 } 417 418 skb_reset_network_header(skb); 419 skb->dev = dev; 420 skb->protocol = htons(ETH_P_TIPC); 421 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, 422 dev->dev_addr, skb->len); 423 dev_queue_xmit(skb); 424 return 0; 425 } 426 427 int tipc_bearer_mtu(struct net *net, u32 bearer_id) 428 { 429 int mtu = 0; 430 struct tipc_bearer *b; 431 432 rcu_read_lock(); 433 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]); 434 if (b) 435 mtu = b->mtu; 436 rcu_read_unlock(); 437 return mtu; 438 } 439 440 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer 441 */ 442 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, 443 struct sk_buff *skb, 444 struct tipc_media_addr *dest) 445 { 446 struct tipc_net *tn = tipc_net(net); 447 struct tipc_bearer *b; 448 449 rcu_read_lock(); 450 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 451 if (likely(b)) 452 b->media->send_msg(net, skb, b, dest); 453 rcu_read_unlock(); 454 } 455 456 /* tipc_bearer_xmit() -send buffer to destination over bearer 457 */ 458 void tipc_bearer_xmit(struct net *net, u32 bearer_id, 459 struct sk_buff_head *xmitq, 460 struct tipc_media_addr *dst) 461 { 462 struct tipc_net *tn = net_generic(net, tipc_net_id); 463 struct tipc_bearer *b; 464 struct sk_buff *skb, *tmp; 465 466 if (skb_queue_empty(xmitq)) 467 return; 468 469 rcu_read_lock(); 470 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 471 if (likely(b)) { 472 skb_queue_walk_safe(xmitq, skb, tmp) { 473 __skb_dequeue(xmitq); 474 b->media->send_msg(net, skb, b, dst); 475 } 476 } 477 rcu_read_unlock(); 478 } 479 480 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations 481 */ 482 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 483 struct sk_buff_head *xmitq) 484 { 485 struct tipc_net *tn = tipc_net(net); 486 int net_id = tn->net_id; 487 struct tipc_bearer *b; 488 struct sk_buff *skb, *tmp; 489 struct tipc_msg *hdr; 490 491 rcu_read_lock(); 492 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 493 if (likely(b)) { 494 skb_queue_walk_safe(xmitq, skb, tmp) { 495 hdr = buf_msg(skb); 496 msg_set_non_seq(hdr, 1); 497 msg_set_mc_netid(hdr, net_id); 498 __skb_dequeue(xmitq); 499 b->media->send_msg(net, skb, b, &b->bcast_addr); 500 } 501 } 502 rcu_read_unlock(); 503 } 504 505 /** 506 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 507 * @buf: the received packet 508 * @dev: the net device that the packet was received on 509 * @pt: the packet_type structure which was used to register this handler 510 * @orig_dev: the original receive net device in case the device is a bond 511 * 512 * Accept only packets explicitly sent to this node, or broadcast packets; 513 * ignores packets sent using interface multicast, and traffic sent to other 514 * nodes (which can happen if interface is running in promiscuous mode). 515 */ 516 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev, 517 struct packet_type *pt, struct net_device *orig_dev) 518 { 519 struct tipc_bearer *b; 520 521 rcu_read_lock(); 522 b = rcu_dereference_rtnl(dev->tipc_ptr); 523 if (likely(b)) { 524 if (likely(buf->pkt_type <= PACKET_BROADCAST)) { 525 buf->next = NULL; 526 tipc_rcv(dev_net(dev), buf, b); 527 rcu_read_unlock(); 528 return NET_RX_SUCCESS; 529 } 530 } 531 rcu_read_unlock(); 532 533 kfree_skb(buf); 534 return NET_RX_DROP; 535 } 536 537 /** 538 * tipc_l2_device_event - handle device events from network device 539 * @nb: the context of the notification 540 * @evt: the type of event 541 * @ptr: the net device that the event was on 542 * 543 * This function is called by the Ethernet driver in case of link 544 * change event. 545 */ 546 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 547 void *ptr) 548 { 549 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 550 struct net *net = dev_net(dev); 551 struct tipc_bearer *b; 552 553 b = rtnl_dereference(dev->tipc_ptr); 554 if (!b) 555 return NOTIFY_DONE; 556 557 b->mtu = dev->mtu; 558 559 switch (evt) { 560 case NETDEV_CHANGE: 561 if (netif_carrier_ok(dev)) 562 break; 563 case NETDEV_GOING_DOWN: 564 case NETDEV_CHANGEMTU: 565 tipc_reset_bearer(net, b); 566 break; 567 case NETDEV_CHANGEADDR: 568 b->media->raw2addr(b, &b->addr, 569 (char *)dev->dev_addr); 570 tipc_reset_bearer(net, b); 571 break; 572 case NETDEV_UNREGISTER: 573 case NETDEV_CHANGENAME: 574 bearer_disable(dev_net(dev), b); 575 break; 576 } 577 return NOTIFY_OK; 578 } 579 580 static struct packet_type tipc_packet_type __read_mostly = { 581 .type = htons(ETH_P_TIPC), 582 .func = tipc_l2_rcv_msg, 583 }; 584 585 static struct notifier_block notifier = { 586 .notifier_call = tipc_l2_device_event, 587 .priority = 0, 588 }; 589 590 int tipc_bearer_setup(void) 591 { 592 int err; 593 594 err = register_netdevice_notifier(¬ifier); 595 if (err) 596 return err; 597 dev_add_pack(&tipc_packet_type); 598 return 0; 599 } 600 601 void tipc_bearer_cleanup(void) 602 { 603 unregister_netdevice_notifier(¬ifier); 604 dev_remove_pack(&tipc_packet_type); 605 } 606 607 void tipc_bearer_stop(struct net *net) 608 { 609 struct tipc_net *tn = net_generic(net, tipc_net_id); 610 struct tipc_bearer *b; 611 u32 i; 612 613 for (i = 0; i < MAX_BEARERS; i++) { 614 b = rtnl_dereference(tn->bearer_list[i]); 615 if (b) { 616 bearer_disable(net, b); 617 tn->bearer_list[i] = NULL; 618 } 619 } 620 } 621 622 /* Caller should hold rtnl_lock to protect the bearer */ 623 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 624 struct tipc_bearer *bearer, int nlflags) 625 { 626 void *hdr; 627 struct nlattr *attrs; 628 struct nlattr *prop; 629 630 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 631 nlflags, TIPC_NL_BEARER_GET); 632 if (!hdr) 633 return -EMSGSIZE; 634 635 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 636 if (!attrs) 637 goto msg_full; 638 639 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 640 goto attr_msg_full; 641 642 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 643 if (!prop) 644 goto prop_msg_full; 645 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 646 goto prop_msg_full; 647 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 648 goto prop_msg_full; 649 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 650 goto prop_msg_full; 651 652 nla_nest_end(msg->skb, prop); 653 nla_nest_end(msg->skb, attrs); 654 genlmsg_end(msg->skb, hdr); 655 656 return 0; 657 658 prop_msg_full: 659 nla_nest_cancel(msg->skb, prop); 660 attr_msg_full: 661 nla_nest_cancel(msg->skb, attrs); 662 msg_full: 663 genlmsg_cancel(msg->skb, hdr); 664 665 return -EMSGSIZE; 666 } 667 668 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 669 { 670 int err; 671 int i = cb->args[0]; 672 struct tipc_bearer *bearer; 673 struct tipc_nl_msg msg; 674 struct net *net = sock_net(skb->sk); 675 struct tipc_net *tn = net_generic(net, tipc_net_id); 676 677 if (i == MAX_BEARERS) 678 return 0; 679 680 msg.skb = skb; 681 msg.portid = NETLINK_CB(cb->skb).portid; 682 msg.seq = cb->nlh->nlmsg_seq; 683 684 rtnl_lock(); 685 for (i = 0; i < MAX_BEARERS; i++) { 686 bearer = rtnl_dereference(tn->bearer_list[i]); 687 if (!bearer) 688 continue; 689 690 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 691 if (err) 692 break; 693 } 694 rtnl_unlock(); 695 696 cb->args[0] = i; 697 return skb->len; 698 } 699 700 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 701 { 702 int err; 703 char *name; 704 struct sk_buff *rep; 705 struct tipc_bearer *bearer; 706 struct tipc_nl_msg msg; 707 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 708 struct net *net = genl_info_net(info); 709 710 if (!info->attrs[TIPC_NLA_BEARER]) 711 return -EINVAL; 712 713 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 714 info->attrs[TIPC_NLA_BEARER], 715 tipc_nl_bearer_policy); 716 if (err) 717 return err; 718 719 if (!attrs[TIPC_NLA_BEARER_NAME]) 720 return -EINVAL; 721 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 722 723 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 724 if (!rep) 725 return -ENOMEM; 726 727 msg.skb = rep; 728 msg.portid = info->snd_portid; 729 msg.seq = info->snd_seq; 730 731 rtnl_lock(); 732 bearer = tipc_bearer_find(net, name); 733 if (!bearer) { 734 err = -EINVAL; 735 goto err_out; 736 } 737 738 err = __tipc_nl_add_bearer(&msg, bearer, 0); 739 if (err) 740 goto err_out; 741 rtnl_unlock(); 742 743 return genlmsg_reply(rep, info); 744 err_out: 745 rtnl_unlock(); 746 nlmsg_free(rep); 747 748 return err; 749 } 750 751 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 752 { 753 int err; 754 char *name; 755 struct tipc_bearer *bearer; 756 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 757 struct net *net = sock_net(skb->sk); 758 759 if (!info->attrs[TIPC_NLA_BEARER]) 760 return -EINVAL; 761 762 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 763 info->attrs[TIPC_NLA_BEARER], 764 tipc_nl_bearer_policy); 765 if (err) 766 return err; 767 768 if (!attrs[TIPC_NLA_BEARER_NAME]) 769 return -EINVAL; 770 771 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 772 773 rtnl_lock(); 774 bearer = tipc_bearer_find(net, name); 775 if (!bearer) { 776 rtnl_unlock(); 777 return -EINVAL; 778 } 779 780 bearer_disable(net, bearer); 781 rtnl_unlock(); 782 783 return 0; 784 } 785 786 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 787 { 788 int err; 789 char *bearer; 790 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 791 struct net *net = sock_net(skb->sk); 792 struct tipc_net *tn = net_generic(net, tipc_net_id); 793 u32 domain; 794 u32 prio; 795 796 prio = TIPC_MEDIA_LINK_PRI; 797 domain = tn->own_addr & TIPC_CLUSTER_MASK; 798 799 if (!info->attrs[TIPC_NLA_BEARER]) 800 return -EINVAL; 801 802 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 803 info->attrs[TIPC_NLA_BEARER], 804 tipc_nl_bearer_policy); 805 if (err) 806 return err; 807 808 if (!attrs[TIPC_NLA_BEARER_NAME]) 809 return -EINVAL; 810 811 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 812 813 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 814 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 815 816 if (attrs[TIPC_NLA_BEARER_PROP]) { 817 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 818 819 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 820 props); 821 if (err) 822 return err; 823 824 if (props[TIPC_NLA_PROP_PRIO]) 825 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 826 } 827 828 rtnl_lock(); 829 err = tipc_enable_bearer(net, bearer, domain, prio, attrs); 830 if (err) { 831 rtnl_unlock(); 832 return err; 833 } 834 rtnl_unlock(); 835 836 return 0; 837 } 838 839 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 840 { 841 int err; 842 char *name; 843 struct tipc_bearer *b; 844 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 845 struct net *net = sock_net(skb->sk); 846 847 if (!info->attrs[TIPC_NLA_BEARER]) 848 return -EINVAL; 849 850 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 851 info->attrs[TIPC_NLA_BEARER], 852 tipc_nl_bearer_policy); 853 if (err) 854 return err; 855 856 if (!attrs[TIPC_NLA_BEARER_NAME]) 857 return -EINVAL; 858 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 859 860 rtnl_lock(); 861 b = tipc_bearer_find(net, name); 862 if (!b) { 863 rtnl_unlock(); 864 return -EINVAL; 865 } 866 867 if (attrs[TIPC_NLA_BEARER_PROP]) { 868 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 869 870 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 871 props); 872 if (err) { 873 rtnl_unlock(); 874 return err; 875 } 876 877 if (props[TIPC_NLA_PROP_TOL]) 878 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 879 if (props[TIPC_NLA_PROP_PRIO]) 880 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 881 if (props[TIPC_NLA_PROP_WIN]) 882 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 883 } 884 rtnl_unlock(); 885 886 return 0; 887 } 888 889 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 890 struct tipc_media *media, int nlflags) 891 { 892 void *hdr; 893 struct nlattr *attrs; 894 struct nlattr *prop; 895 896 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 897 nlflags, TIPC_NL_MEDIA_GET); 898 if (!hdr) 899 return -EMSGSIZE; 900 901 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 902 if (!attrs) 903 goto msg_full; 904 905 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 906 goto attr_msg_full; 907 908 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 909 if (!prop) 910 goto prop_msg_full; 911 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 912 goto prop_msg_full; 913 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 914 goto prop_msg_full; 915 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 916 goto prop_msg_full; 917 918 nla_nest_end(msg->skb, prop); 919 nla_nest_end(msg->skb, attrs); 920 genlmsg_end(msg->skb, hdr); 921 922 return 0; 923 924 prop_msg_full: 925 nla_nest_cancel(msg->skb, prop); 926 attr_msg_full: 927 nla_nest_cancel(msg->skb, attrs); 928 msg_full: 929 genlmsg_cancel(msg->skb, hdr); 930 931 return -EMSGSIZE; 932 } 933 934 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 935 { 936 int err; 937 int i = cb->args[0]; 938 struct tipc_nl_msg msg; 939 940 if (i == MAX_MEDIA) 941 return 0; 942 943 msg.skb = skb; 944 msg.portid = NETLINK_CB(cb->skb).portid; 945 msg.seq = cb->nlh->nlmsg_seq; 946 947 rtnl_lock(); 948 for (; media_info_array[i] != NULL; i++) { 949 err = __tipc_nl_add_media(&msg, media_info_array[i], 950 NLM_F_MULTI); 951 if (err) 952 break; 953 } 954 rtnl_unlock(); 955 956 cb->args[0] = i; 957 return skb->len; 958 } 959 960 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 961 { 962 int err; 963 char *name; 964 struct tipc_nl_msg msg; 965 struct tipc_media *media; 966 struct sk_buff *rep; 967 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 968 969 if (!info->attrs[TIPC_NLA_MEDIA]) 970 return -EINVAL; 971 972 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 973 info->attrs[TIPC_NLA_MEDIA], 974 tipc_nl_media_policy); 975 if (err) 976 return err; 977 978 if (!attrs[TIPC_NLA_MEDIA_NAME]) 979 return -EINVAL; 980 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 981 982 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 983 if (!rep) 984 return -ENOMEM; 985 986 msg.skb = rep; 987 msg.portid = info->snd_portid; 988 msg.seq = info->snd_seq; 989 990 rtnl_lock(); 991 media = tipc_media_find(name); 992 if (!media) { 993 err = -EINVAL; 994 goto err_out; 995 } 996 997 err = __tipc_nl_add_media(&msg, media, 0); 998 if (err) 999 goto err_out; 1000 rtnl_unlock(); 1001 1002 return genlmsg_reply(rep, info); 1003 err_out: 1004 rtnl_unlock(); 1005 nlmsg_free(rep); 1006 1007 return err; 1008 } 1009 1010 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1011 { 1012 int err; 1013 char *name; 1014 struct tipc_media *m; 1015 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1016 1017 if (!info->attrs[TIPC_NLA_MEDIA]) 1018 return -EINVAL; 1019 1020 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1021 info->attrs[TIPC_NLA_MEDIA], 1022 tipc_nl_media_policy); 1023 1024 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1025 return -EINVAL; 1026 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1027 1028 rtnl_lock(); 1029 m = tipc_media_find(name); 1030 if (!m) { 1031 rtnl_unlock(); 1032 return -EINVAL; 1033 } 1034 1035 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1036 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1037 1038 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1039 props); 1040 if (err) { 1041 rtnl_unlock(); 1042 return err; 1043 } 1044 1045 if (props[TIPC_NLA_PROP_TOL]) 1046 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1047 if (props[TIPC_NLA_PROP_PRIO]) 1048 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1049 if (props[TIPC_NLA_PROP_WIN]) 1050 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1051 } 1052 rtnl_unlock(); 1053 1054 return 0; 1055 } 1056