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