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