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 /* tipc_bearer_reset_all - reset all links on all bearers 334 */ 335 void tipc_bearer_reset_all(struct net *net) 336 { 337 struct tipc_net *tn = tipc_net(net); 338 struct tipc_bearer *b; 339 int i; 340 341 for (i = 0; i < MAX_BEARERS; i++) { 342 b = rcu_dereference_rtnl(tn->bearer_list[i]); 343 if (b) 344 tipc_reset_bearer(net, b); 345 } 346 } 347 348 /** 349 * bearer_disable 350 * 351 * Note: This routine assumes caller holds RTNL lock. 352 */ 353 static void bearer_disable(struct net *net, struct tipc_bearer *b) 354 { 355 struct tipc_net *tn = tipc_net(net); 356 int bearer_id = b->identity; 357 358 pr_info("Disabling bearer <%s>\n", b->name); 359 b->media->disable_media(b); 360 tipc_node_delete_links(net, bearer_id); 361 RCU_INIT_POINTER(b->media_ptr, NULL); 362 if (b->link_req) 363 tipc_disc_delete(b->link_req); 364 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); 365 kfree_rcu(b, rcu); 366 } 367 368 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, 369 struct nlattr *attr[]) 370 { 371 struct net_device *dev; 372 char *driver_name = strchr((const char *)b->name, ':') + 1; 373 374 /* Find device with specified name */ 375 dev = dev_get_by_name(net, driver_name); 376 if (!dev) 377 return -ENODEV; 378 379 /* Associate TIPC bearer with L2 bearer */ 380 rcu_assign_pointer(b->media_ptr, dev); 381 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); 382 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); 383 b->bcast_addr.media_id = b->media->type_id; 384 b->bcast_addr.broadcast = 1; 385 b->mtu = dev->mtu; 386 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); 387 rcu_assign_pointer(dev->tipc_ptr, b); 388 return 0; 389 } 390 391 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface 392 * 393 * Mark L2 bearer as inactive so that incoming buffers are thrown away 394 */ 395 void tipc_disable_l2_media(struct tipc_bearer *b) 396 { 397 struct net_device *dev; 398 399 dev = (struct net_device *)rtnl_dereference(b->media_ptr); 400 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 401 synchronize_net(); 402 dev_put(dev); 403 } 404 405 /** 406 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface 407 * @skb: the packet to be sent 408 * @b: the bearer through which the packet is to be sent 409 * @dest: peer destination address 410 */ 411 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, 412 struct tipc_bearer *b, struct tipc_media_addr *dest) 413 { 414 struct net_device *dev; 415 int delta; 416 void *tipc_ptr; 417 418 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); 419 if (!dev) 420 return 0; 421 422 /* Send RESET message even if bearer is detached from device */ 423 tipc_ptr = rcu_dereference_rtnl(dev->tipc_ptr); 424 if (unlikely(!tipc_ptr && !msg_is_reset(buf_msg(skb)))) 425 goto drop; 426 427 delta = dev->hard_header_len - skb_headroom(skb); 428 if ((delta > 0) && 429 pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) 430 goto drop; 431 432 skb_reset_network_header(skb); 433 skb->dev = dev; 434 skb->protocol = htons(ETH_P_TIPC); 435 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, 436 dev->dev_addr, skb->len); 437 dev_queue_xmit(skb); 438 return 0; 439 drop: 440 kfree_skb(skb); 441 return 0; 442 } 443 444 int tipc_bearer_mtu(struct net *net, u32 bearer_id) 445 { 446 int mtu = 0; 447 struct tipc_bearer *b; 448 449 rcu_read_lock(); 450 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]); 451 if (b) 452 mtu = b->mtu; 453 rcu_read_unlock(); 454 return mtu; 455 } 456 457 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer 458 */ 459 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, 460 struct sk_buff *skb, 461 struct tipc_media_addr *dest) 462 { 463 struct tipc_net *tn = tipc_net(net); 464 struct tipc_bearer *b; 465 466 rcu_read_lock(); 467 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 468 if (likely(b)) 469 b->media->send_msg(net, skb, b, dest); 470 else 471 kfree_skb(skb); 472 rcu_read_unlock(); 473 } 474 475 /* tipc_bearer_xmit() -send buffer to destination over bearer 476 */ 477 void tipc_bearer_xmit(struct net *net, u32 bearer_id, 478 struct sk_buff_head *xmitq, 479 struct tipc_media_addr *dst) 480 { 481 struct tipc_net *tn = net_generic(net, tipc_net_id); 482 struct tipc_bearer *b; 483 struct sk_buff *skb, *tmp; 484 485 if (skb_queue_empty(xmitq)) 486 return; 487 488 rcu_read_lock(); 489 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 490 if (unlikely(!b)) 491 __skb_queue_purge(xmitq); 492 skb_queue_walk_safe(xmitq, skb, tmp) { 493 __skb_dequeue(xmitq); 494 b->media->send_msg(net, skb, b, dst); 495 } 496 rcu_read_unlock(); 497 } 498 499 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations 500 */ 501 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 502 struct sk_buff_head *xmitq) 503 { 504 struct tipc_net *tn = tipc_net(net); 505 int net_id = tn->net_id; 506 struct tipc_bearer *b; 507 struct sk_buff *skb, *tmp; 508 struct tipc_msg *hdr; 509 510 rcu_read_lock(); 511 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); 512 if (unlikely(!b)) 513 __skb_queue_purge(xmitq); 514 skb_queue_walk_safe(xmitq, skb, tmp) { 515 hdr = buf_msg(skb); 516 msg_set_non_seq(hdr, 1); 517 msg_set_mc_netid(hdr, net_id); 518 __skb_dequeue(xmitq); 519 b->media->send_msg(net, skb, b, &b->bcast_addr); 520 } 521 rcu_read_unlock(); 522 } 523 524 /** 525 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface 526 * @buf: the received packet 527 * @dev: the net device that the packet was received on 528 * @pt: the packet_type structure which was used to register this handler 529 * @orig_dev: the original receive net device in case the device is a bond 530 * 531 * Accept only packets explicitly sent to this node, or broadcast packets; 532 * ignores packets sent using interface multicast, and traffic sent to other 533 * nodes (which can happen if interface is running in promiscuous mode). 534 */ 535 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, 536 struct packet_type *pt, struct net_device *orig_dev) 537 { 538 struct tipc_bearer *b; 539 540 rcu_read_lock(); 541 b = rcu_dereference_rtnl(dev->tipc_ptr); 542 if (likely(b && (skb->pkt_type <= PACKET_BROADCAST))) { 543 skb->next = NULL; 544 tipc_rcv(dev_net(dev), skb, b); 545 rcu_read_unlock(); 546 return NET_RX_SUCCESS; 547 } 548 rcu_read_unlock(); 549 kfree_skb(skb); 550 return NET_RX_DROP; 551 } 552 553 /** 554 * tipc_l2_device_event - handle device events from network device 555 * @nb: the context of the notification 556 * @evt: the type of event 557 * @ptr: the net device that the event was on 558 * 559 * This function is called by the Ethernet driver in case of link 560 * change event. 561 */ 562 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, 563 void *ptr) 564 { 565 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 566 struct net *net = dev_net(dev); 567 struct tipc_net *tn = tipc_net(net); 568 struct tipc_bearer *b; 569 int i; 570 571 b = rtnl_dereference(dev->tipc_ptr); 572 if (!b) { 573 for (i = 0; i < MAX_BEARERS; b = NULL, i++) { 574 b = rtnl_dereference(tn->bearer_list[i]); 575 if (b && (b->media_ptr == dev)) 576 break; 577 } 578 } 579 if (!b) 580 return NOTIFY_DONE; 581 582 b->mtu = dev->mtu; 583 584 switch (evt) { 585 case NETDEV_CHANGE: 586 if (netif_carrier_ok(dev)) 587 break; 588 case NETDEV_UP: 589 rcu_assign_pointer(dev->tipc_ptr, b); 590 break; 591 case NETDEV_GOING_DOWN: 592 RCU_INIT_POINTER(dev->tipc_ptr, NULL); 593 synchronize_net(); 594 tipc_reset_bearer(net, b); 595 break; 596 case NETDEV_CHANGEMTU: 597 tipc_reset_bearer(net, b); 598 break; 599 case NETDEV_CHANGEADDR: 600 b->media->raw2addr(b, &b->addr, 601 (char *)dev->dev_addr); 602 tipc_reset_bearer(net, b); 603 break; 604 case NETDEV_UNREGISTER: 605 case NETDEV_CHANGENAME: 606 bearer_disable(dev_net(dev), b); 607 break; 608 } 609 return NOTIFY_OK; 610 } 611 612 static struct packet_type tipc_packet_type __read_mostly = { 613 .type = htons(ETH_P_TIPC), 614 .func = tipc_l2_rcv_msg, 615 }; 616 617 static struct notifier_block notifier = { 618 .notifier_call = tipc_l2_device_event, 619 .priority = 0, 620 }; 621 622 int tipc_bearer_setup(void) 623 { 624 int err; 625 626 err = register_netdevice_notifier(¬ifier); 627 if (err) 628 return err; 629 dev_add_pack(&tipc_packet_type); 630 return 0; 631 } 632 633 void tipc_bearer_cleanup(void) 634 { 635 unregister_netdevice_notifier(¬ifier); 636 dev_remove_pack(&tipc_packet_type); 637 } 638 639 void tipc_bearer_stop(struct net *net) 640 { 641 struct tipc_net *tn = net_generic(net, tipc_net_id); 642 struct tipc_bearer *b; 643 u32 i; 644 645 for (i = 0; i < MAX_BEARERS; i++) { 646 b = rtnl_dereference(tn->bearer_list[i]); 647 if (b) { 648 bearer_disable(net, b); 649 tn->bearer_list[i] = NULL; 650 } 651 } 652 } 653 654 /* Caller should hold rtnl_lock to protect the bearer */ 655 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, 656 struct tipc_bearer *bearer, int nlflags) 657 { 658 void *hdr; 659 struct nlattr *attrs; 660 struct nlattr *prop; 661 662 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 663 nlflags, TIPC_NL_BEARER_GET); 664 if (!hdr) 665 return -EMSGSIZE; 666 667 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); 668 if (!attrs) 669 goto msg_full; 670 671 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) 672 goto attr_msg_full; 673 674 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); 675 if (!prop) 676 goto prop_msg_full; 677 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) 678 goto prop_msg_full; 679 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) 680 goto prop_msg_full; 681 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) 682 goto prop_msg_full; 683 684 nla_nest_end(msg->skb, prop); 685 nla_nest_end(msg->skb, attrs); 686 genlmsg_end(msg->skb, hdr); 687 688 return 0; 689 690 prop_msg_full: 691 nla_nest_cancel(msg->skb, prop); 692 attr_msg_full: 693 nla_nest_cancel(msg->skb, attrs); 694 msg_full: 695 genlmsg_cancel(msg->skb, hdr); 696 697 return -EMSGSIZE; 698 } 699 700 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) 701 { 702 int err; 703 int i = cb->args[0]; 704 struct tipc_bearer *bearer; 705 struct tipc_nl_msg msg; 706 struct net *net = sock_net(skb->sk); 707 struct tipc_net *tn = net_generic(net, tipc_net_id); 708 709 if (i == MAX_BEARERS) 710 return 0; 711 712 msg.skb = skb; 713 msg.portid = NETLINK_CB(cb->skb).portid; 714 msg.seq = cb->nlh->nlmsg_seq; 715 716 rtnl_lock(); 717 for (i = 0; i < MAX_BEARERS; i++) { 718 bearer = rtnl_dereference(tn->bearer_list[i]); 719 if (!bearer) 720 continue; 721 722 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); 723 if (err) 724 break; 725 } 726 rtnl_unlock(); 727 728 cb->args[0] = i; 729 return skb->len; 730 } 731 732 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) 733 { 734 int err; 735 char *name; 736 struct sk_buff *rep; 737 struct tipc_bearer *bearer; 738 struct tipc_nl_msg msg; 739 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 740 struct net *net = genl_info_net(info); 741 742 if (!info->attrs[TIPC_NLA_BEARER]) 743 return -EINVAL; 744 745 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 746 info->attrs[TIPC_NLA_BEARER], 747 tipc_nl_bearer_policy); 748 if (err) 749 return err; 750 751 if (!attrs[TIPC_NLA_BEARER_NAME]) 752 return -EINVAL; 753 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 754 755 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 756 if (!rep) 757 return -ENOMEM; 758 759 msg.skb = rep; 760 msg.portid = info->snd_portid; 761 msg.seq = info->snd_seq; 762 763 rtnl_lock(); 764 bearer = tipc_bearer_find(net, name); 765 if (!bearer) { 766 err = -EINVAL; 767 goto err_out; 768 } 769 770 err = __tipc_nl_add_bearer(&msg, bearer, 0); 771 if (err) 772 goto err_out; 773 rtnl_unlock(); 774 775 return genlmsg_reply(rep, info); 776 err_out: 777 rtnl_unlock(); 778 nlmsg_free(rep); 779 780 return err; 781 } 782 783 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) 784 { 785 int err; 786 char *name; 787 struct tipc_bearer *bearer; 788 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 789 struct net *net = sock_net(skb->sk); 790 791 if (!info->attrs[TIPC_NLA_BEARER]) 792 return -EINVAL; 793 794 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 795 info->attrs[TIPC_NLA_BEARER], 796 tipc_nl_bearer_policy); 797 if (err) 798 return err; 799 800 if (!attrs[TIPC_NLA_BEARER_NAME]) 801 return -EINVAL; 802 803 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 804 805 rtnl_lock(); 806 bearer = tipc_bearer_find(net, name); 807 if (!bearer) { 808 rtnl_unlock(); 809 return -EINVAL; 810 } 811 812 bearer_disable(net, bearer); 813 rtnl_unlock(); 814 815 return 0; 816 } 817 818 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) 819 { 820 int err; 821 char *bearer; 822 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 823 struct net *net = sock_net(skb->sk); 824 struct tipc_net *tn = net_generic(net, tipc_net_id); 825 u32 domain; 826 u32 prio; 827 828 prio = TIPC_MEDIA_LINK_PRI; 829 domain = tn->own_addr & TIPC_CLUSTER_MASK; 830 831 if (!info->attrs[TIPC_NLA_BEARER]) 832 return -EINVAL; 833 834 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 835 info->attrs[TIPC_NLA_BEARER], 836 tipc_nl_bearer_policy); 837 if (err) 838 return err; 839 840 if (!attrs[TIPC_NLA_BEARER_NAME]) 841 return -EINVAL; 842 843 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 844 845 if (attrs[TIPC_NLA_BEARER_DOMAIN]) 846 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); 847 848 if (attrs[TIPC_NLA_BEARER_PROP]) { 849 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 850 851 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 852 props); 853 if (err) 854 return err; 855 856 if (props[TIPC_NLA_PROP_PRIO]) 857 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 858 } 859 860 rtnl_lock(); 861 err = tipc_enable_bearer(net, bearer, domain, prio, attrs); 862 if (err) { 863 rtnl_unlock(); 864 return err; 865 } 866 rtnl_unlock(); 867 868 return 0; 869 } 870 871 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) 872 { 873 int err; 874 char *name; 875 struct tipc_bearer *b; 876 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 877 struct net *net = sock_net(skb->sk); 878 879 if (!info->attrs[TIPC_NLA_BEARER]) 880 return -EINVAL; 881 882 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, 883 info->attrs[TIPC_NLA_BEARER], 884 tipc_nl_bearer_policy); 885 if (err) 886 return err; 887 888 if (!attrs[TIPC_NLA_BEARER_NAME]) 889 return -EINVAL; 890 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); 891 892 rtnl_lock(); 893 b = tipc_bearer_find(net, name); 894 if (!b) { 895 rtnl_unlock(); 896 return -EINVAL; 897 } 898 899 if (attrs[TIPC_NLA_BEARER_PROP]) { 900 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 901 902 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], 903 props); 904 if (err) { 905 rtnl_unlock(); 906 return err; 907 } 908 909 if (props[TIPC_NLA_PROP_TOL]) 910 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 911 if (props[TIPC_NLA_PROP_PRIO]) 912 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 913 if (props[TIPC_NLA_PROP_WIN]) 914 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 915 } 916 rtnl_unlock(); 917 918 return 0; 919 } 920 921 static int __tipc_nl_add_media(struct tipc_nl_msg *msg, 922 struct tipc_media *media, int nlflags) 923 { 924 void *hdr; 925 struct nlattr *attrs; 926 struct nlattr *prop; 927 928 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 929 nlflags, TIPC_NL_MEDIA_GET); 930 if (!hdr) 931 return -EMSGSIZE; 932 933 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); 934 if (!attrs) 935 goto msg_full; 936 937 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) 938 goto attr_msg_full; 939 940 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); 941 if (!prop) 942 goto prop_msg_full; 943 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) 944 goto prop_msg_full; 945 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) 946 goto prop_msg_full; 947 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) 948 goto prop_msg_full; 949 950 nla_nest_end(msg->skb, prop); 951 nla_nest_end(msg->skb, attrs); 952 genlmsg_end(msg->skb, hdr); 953 954 return 0; 955 956 prop_msg_full: 957 nla_nest_cancel(msg->skb, prop); 958 attr_msg_full: 959 nla_nest_cancel(msg->skb, attrs); 960 msg_full: 961 genlmsg_cancel(msg->skb, hdr); 962 963 return -EMSGSIZE; 964 } 965 966 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) 967 { 968 int err; 969 int i = cb->args[0]; 970 struct tipc_nl_msg msg; 971 972 if (i == MAX_MEDIA) 973 return 0; 974 975 msg.skb = skb; 976 msg.portid = NETLINK_CB(cb->skb).portid; 977 msg.seq = cb->nlh->nlmsg_seq; 978 979 rtnl_lock(); 980 for (; media_info_array[i] != NULL; i++) { 981 err = __tipc_nl_add_media(&msg, media_info_array[i], 982 NLM_F_MULTI); 983 if (err) 984 break; 985 } 986 rtnl_unlock(); 987 988 cb->args[0] = i; 989 return skb->len; 990 } 991 992 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) 993 { 994 int err; 995 char *name; 996 struct tipc_nl_msg msg; 997 struct tipc_media *media; 998 struct sk_buff *rep; 999 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1000 1001 if (!info->attrs[TIPC_NLA_MEDIA]) 1002 return -EINVAL; 1003 1004 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1005 info->attrs[TIPC_NLA_MEDIA], 1006 tipc_nl_media_policy); 1007 if (err) 1008 return err; 1009 1010 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1011 return -EINVAL; 1012 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1013 1014 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1015 if (!rep) 1016 return -ENOMEM; 1017 1018 msg.skb = rep; 1019 msg.portid = info->snd_portid; 1020 msg.seq = info->snd_seq; 1021 1022 rtnl_lock(); 1023 media = tipc_media_find(name); 1024 if (!media) { 1025 err = -EINVAL; 1026 goto err_out; 1027 } 1028 1029 err = __tipc_nl_add_media(&msg, media, 0); 1030 if (err) 1031 goto err_out; 1032 rtnl_unlock(); 1033 1034 return genlmsg_reply(rep, info); 1035 err_out: 1036 rtnl_unlock(); 1037 nlmsg_free(rep); 1038 1039 return err; 1040 } 1041 1042 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) 1043 { 1044 int err; 1045 char *name; 1046 struct tipc_media *m; 1047 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; 1048 1049 if (!info->attrs[TIPC_NLA_MEDIA]) 1050 return -EINVAL; 1051 1052 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, 1053 info->attrs[TIPC_NLA_MEDIA], 1054 tipc_nl_media_policy); 1055 1056 if (!attrs[TIPC_NLA_MEDIA_NAME]) 1057 return -EINVAL; 1058 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); 1059 1060 rtnl_lock(); 1061 m = tipc_media_find(name); 1062 if (!m) { 1063 rtnl_unlock(); 1064 return -EINVAL; 1065 } 1066 1067 if (attrs[TIPC_NLA_MEDIA_PROP]) { 1068 struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; 1069 1070 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], 1071 props); 1072 if (err) { 1073 rtnl_unlock(); 1074 return err; 1075 } 1076 1077 if (props[TIPC_NLA_PROP_TOL]) 1078 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 1079 if (props[TIPC_NLA_PROP_PRIO]) 1080 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 1081 if (props[TIPC_NLA_PROP_WIN]) 1082 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 1083 } 1084 rtnl_unlock(); 1085 1086 return 0; 1087 } 1088