1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/slab.h> 31 #include <linux/interrupt.h> 32 #include <linux/capability.h> 33 #include <linux/skbuff.h> 34 #include <linux/init.h> 35 #include <linux/security.h> 36 #include <linux/mutex.h> 37 #include <linux/if_addr.h> 38 #include <linux/if_bridge.h> 39 #include <linux/if_vlan.h> 40 #include <linux/pci.h> 41 #include <linux/etherdevice.h> 42 43 #include <asm/uaccess.h> 44 45 #include <linux/inet.h> 46 #include <linux/netdevice.h> 47 #include <net/switchdev.h> 48 #include <net/ip.h> 49 #include <net/protocol.h> 50 #include <net/arp.h> 51 #include <net/route.h> 52 #include <net/udp.h> 53 #include <net/tcp.h> 54 #include <net/sock.h> 55 #include <net/pkt_sched.h> 56 #include <net/fib_rules.h> 57 #include <net/rtnetlink.h> 58 #include <net/net_namespace.h> 59 60 struct rtnl_link { 61 rtnl_doit_func doit; 62 rtnl_dumpit_func dumpit; 63 rtnl_calcit_func calcit; 64 }; 65 66 static DEFINE_MUTEX(rtnl_mutex); 67 68 void rtnl_lock(void) 69 { 70 mutex_lock(&rtnl_mutex); 71 } 72 EXPORT_SYMBOL(rtnl_lock); 73 74 void __rtnl_unlock(void) 75 { 76 mutex_unlock(&rtnl_mutex); 77 } 78 79 void rtnl_unlock(void) 80 { 81 /* This fellow will unlock it for us. */ 82 netdev_run_todo(); 83 } 84 EXPORT_SYMBOL(rtnl_unlock); 85 86 int rtnl_trylock(void) 87 { 88 return mutex_trylock(&rtnl_mutex); 89 } 90 EXPORT_SYMBOL(rtnl_trylock); 91 92 int rtnl_is_locked(void) 93 { 94 return mutex_is_locked(&rtnl_mutex); 95 } 96 EXPORT_SYMBOL(rtnl_is_locked); 97 98 #ifdef CONFIG_PROVE_LOCKING 99 int lockdep_rtnl_is_held(void) 100 { 101 return lockdep_is_held(&rtnl_mutex); 102 } 103 EXPORT_SYMBOL(lockdep_rtnl_is_held); 104 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 105 106 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 107 108 static inline int rtm_msgindex(int msgtype) 109 { 110 int msgindex = msgtype - RTM_BASE; 111 112 /* 113 * msgindex < 0 implies someone tried to register a netlink 114 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 115 * the message type has not been added to linux/rtnetlink.h 116 */ 117 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 118 119 return msgindex; 120 } 121 122 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 123 { 124 struct rtnl_link *tab; 125 126 if (protocol <= RTNL_FAMILY_MAX) 127 tab = rtnl_msg_handlers[protocol]; 128 else 129 tab = NULL; 130 131 if (tab == NULL || tab[msgindex].doit == NULL) 132 tab = rtnl_msg_handlers[PF_UNSPEC]; 133 134 return tab[msgindex].doit; 135 } 136 137 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 138 { 139 struct rtnl_link *tab; 140 141 if (protocol <= RTNL_FAMILY_MAX) 142 tab = rtnl_msg_handlers[protocol]; 143 else 144 tab = NULL; 145 146 if (tab == NULL || tab[msgindex].dumpit == NULL) 147 tab = rtnl_msg_handlers[PF_UNSPEC]; 148 149 return tab[msgindex].dumpit; 150 } 151 152 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 153 { 154 struct rtnl_link *tab; 155 156 if (protocol <= RTNL_FAMILY_MAX) 157 tab = rtnl_msg_handlers[protocol]; 158 else 159 tab = NULL; 160 161 if (tab == NULL || tab[msgindex].calcit == NULL) 162 tab = rtnl_msg_handlers[PF_UNSPEC]; 163 164 return tab[msgindex].calcit; 165 } 166 167 /** 168 * __rtnl_register - Register a rtnetlink message type 169 * @protocol: Protocol family or PF_UNSPEC 170 * @msgtype: rtnetlink message type 171 * @doit: Function pointer called for each request message 172 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 173 * @calcit: Function pointer to calc size of dump message 174 * 175 * Registers the specified function pointers (at least one of them has 176 * to be non-NULL) to be called whenever a request message for the 177 * specified protocol family and message type is received. 178 * 179 * The special protocol family PF_UNSPEC may be used to define fallback 180 * function pointers for the case when no entry for the specific protocol 181 * family exists. 182 * 183 * Returns 0 on success or a negative error code. 184 */ 185 int __rtnl_register(int protocol, int msgtype, 186 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 187 rtnl_calcit_func calcit) 188 { 189 struct rtnl_link *tab; 190 int msgindex; 191 192 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 193 msgindex = rtm_msgindex(msgtype); 194 195 tab = rtnl_msg_handlers[protocol]; 196 if (tab == NULL) { 197 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 198 if (tab == NULL) 199 return -ENOBUFS; 200 201 rtnl_msg_handlers[protocol] = tab; 202 } 203 204 if (doit) 205 tab[msgindex].doit = doit; 206 207 if (dumpit) 208 tab[msgindex].dumpit = dumpit; 209 210 if (calcit) 211 tab[msgindex].calcit = calcit; 212 213 return 0; 214 } 215 EXPORT_SYMBOL_GPL(__rtnl_register); 216 217 /** 218 * rtnl_register - Register a rtnetlink message type 219 * 220 * Identical to __rtnl_register() but panics on failure. This is useful 221 * as failure of this function is very unlikely, it can only happen due 222 * to lack of memory when allocating the chain to store all message 223 * handlers for a protocol. Meant for use in init functions where lack 224 * of memory implies no sense in continuing. 225 */ 226 void rtnl_register(int protocol, int msgtype, 227 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 228 rtnl_calcit_func calcit) 229 { 230 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 231 panic("Unable to register rtnetlink message handler, " 232 "protocol = %d, message type = %d\n", 233 protocol, msgtype); 234 } 235 EXPORT_SYMBOL_GPL(rtnl_register); 236 237 /** 238 * rtnl_unregister - Unregister a rtnetlink message type 239 * @protocol: Protocol family or PF_UNSPEC 240 * @msgtype: rtnetlink message type 241 * 242 * Returns 0 on success or a negative error code. 243 */ 244 int rtnl_unregister(int protocol, int msgtype) 245 { 246 int msgindex; 247 248 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 249 msgindex = rtm_msgindex(msgtype); 250 251 if (rtnl_msg_handlers[protocol] == NULL) 252 return -ENOENT; 253 254 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 255 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 256 257 return 0; 258 } 259 EXPORT_SYMBOL_GPL(rtnl_unregister); 260 261 /** 262 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 263 * @protocol : Protocol family or PF_UNSPEC 264 * 265 * Identical to calling rtnl_unregster() for all registered message types 266 * of a certain protocol family. 267 */ 268 void rtnl_unregister_all(int protocol) 269 { 270 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 271 272 kfree(rtnl_msg_handlers[protocol]); 273 rtnl_msg_handlers[protocol] = NULL; 274 } 275 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 276 277 static LIST_HEAD(link_ops); 278 279 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 280 { 281 const struct rtnl_link_ops *ops; 282 283 list_for_each_entry(ops, &link_ops, list) { 284 if (!strcmp(ops->kind, kind)) 285 return ops; 286 } 287 return NULL; 288 } 289 290 /** 291 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 292 * @ops: struct rtnl_link_ops * to register 293 * 294 * The caller must hold the rtnl_mutex. This function should be used 295 * by drivers that create devices during module initialization. It 296 * must be called before registering the devices. 297 * 298 * Returns 0 on success or a negative error code. 299 */ 300 int __rtnl_link_register(struct rtnl_link_ops *ops) 301 { 302 if (rtnl_link_ops_get(ops->kind)) 303 return -EEXIST; 304 305 /* The check for setup is here because if ops 306 * does not have that filled up, it is not possible 307 * to use the ops for creating device. So do not 308 * fill up dellink as well. That disables rtnl_dellink. 309 */ 310 if (ops->setup && !ops->dellink) 311 ops->dellink = unregister_netdevice_queue; 312 313 list_add_tail(&ops->list, &link_ops); 314 return 0; 315 } 316 EXPORT_SYMBOL_GPL(__rtnl_link_register); 317 318 /** 319 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 320 * @ops: struct rtnl_link_ops * to register 321 * 322 * Returns 0 on success or a negative error code. 323 */ 324 int rtnl_link_register(struct rtnl_link_ops *ops) 325 { 326 int err; 327 328 rtnl_lock(); 329 err = __rtnl_link_register(ops); 330 rtnl_unlock(); 331 return err; 332 } 333 EXPORT_SYMBOL_GPL(rtnl_link_register); 334 335 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 336 { 337 struct net_device *dev; 338 LIST_HEAD(list_kill); 339 340 for_each_netdev(net, dev) { 341 if (dev->rtnl_link_ops == ops) 342 ops->dellink(dev, &list_kill); 343 } 344 unregister_netdevice_many(&list_kill); 345 } 346 347 /** 348 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 349 * @ops: struct rtnl_link_ops * to unregister 350 * 351 * The caller must hold the rtnl_mutex. 352 */ 353 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 354 { 355 struct net *net; 356 357 for_each_net(net) { 358 __rtnl_kill_links(net, ops); 359 } 360 list_del(&ops->list); 361 } 362 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 363 364 /* Return with the rtnl_lock held when there are no network 365 * devices unregistering in any network namespace. 366 */ 367 static void rtnl_lock_unregistering_all(void) 368 { 369 struct net *net; 370 bool unregistering; 371 DEFINE_WAIT_FUNC(wait, woken_wake_function); 372 373 add_wait_queue(&netdev_unregistering_wq, &wait); 374 for (;;) { 375 unregistering = false; 376 rtnl_lock(); 377 for_each_net(net) { 378 if (net->dev_unreg_count > 0) { 379 unregistering = true; 380 break; 381 } 382 } 383 if (!unregistering) 384 break; 385 __rtnl_unlock(); 386 387 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 388 } 389 remove_wait_queue(&netdev_unregistering_wq, &wait); 390 } 391 392 /** 393 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 394 * @ops: struct rtnl_link_ops * to unregister 395 */ 396 void rtnl_link_unregister(struct rtnl_link_ops *ops) 397 { 398 /* Close the race with cleanup_net() */ 399 mutex_lock(&net_mutex); 400 rtnl_lock_unregistering_all(); 401 __rtnl_link_unregister(ops); 402 rtnl_unlock(); 403 mutex_unlock(&net_mutex); 404 } 405 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 406 407 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 408 { 409 struct net_device *master_dev; 410 const struct rtnl_link_ops *ops; 411 412 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 413 if (!master_dev) 414 return 0; 415 ops = master_dev->rtnl_link_ops; 416 if (!ops || !ops->get_slave_size) 417 return 0; 418 /* IFLA_INFO_SLAVE_DATA + nested data */ 419 return nla_total_size(sizeof(struct nlattr)) + 420 ops->get_slave_size(master_dev, dev); 421 } 422 423 static size_t rtnl_link_get_size(const struct net_device *dev) 424 { 425 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 426 size_t size; 427 428 if (!ops) 429 return 0; 430 431 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 432 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 433 434 if (ops->get_size) 435 /* IFLA_INFO_DATA + nested data */ 436 size += nla_total_size(sizeof(struct nlattr)) + 437 ops->get_size(dev); 438 439 if (ops->get_xstats_size) 440 /* IFLA_INFO_XSTATS */ 441 size += nla_total_size(ops->get_xstats_size(dev)); 442 443 size += rtnl_link_get_slave_info_data_size(dev); 444 445 return size; 446 } 447 448 static LIST_HEAD(rtnl_af_ops); 449 450 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 451 { 452 const struct rtnl_af_ops *ops; 453 454 list_for_each_entry(ops, &rtnl_af_ops, list) { 455 if (ops->family == family) 456 return ops; 457 } 458 459 return NULL; 460 } 461 462 /** 463 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 464 * @ops: struct rtnl_af_ops * to register 465 * 466 * Returns 0 on success or a negative error code. 467 */ 468 void rtnl_af_register(struct rtnl_af_ops *ops) 469 { 470 rtnl_lock(); 471 list_add_tail(&ops->list, &rtnl_af_ops); 472 rtnl_unlock(); 473 } 474 EXPORT_SYMBOL_GPL(rtnl_af_register); 475 476 /** 477 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 478 * @ops: struct rtnl_af_ops * to unregister 479 * 480 * The caller must hold the rtnl_mutex. 481 */ 482 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 483 { 484 list_del(&ops->list); 485 } 486 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 487 488 /** 489 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 490 * @ops: struct rtnl_af_ops * to unregister 491 */ 492 void rtnl_af_unregister(struct rtnl_af_ops *ops) 493 { 494 rtnl_lock(); 495 __rtnl_af_unregister(ops); 496 rtnl_unlock(); 497 } 498 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 499 500 static size_t rtnl_link_get_af_size(const struct net_device *dev) 501 { 502 struct rtnl_af_ops *af_ops; 503 size_t size; 504 505 /* IFLA_AF_SPEC */ 506 size = nla_total_size(sizeof(struct nlattr)); 507 508 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 509 if (af_ops->get_link_af_size) { 510 /* AF_* + nested data */ 511 size += nla_total_size(sizeof(struct nlattr)) + 512 af_ops->get_link_af_size(dev); 513 } 514 } 515 516 return size; 517 } 518 519 static bool rtnl_have_link_slave_info(const struct net_device *dev) 520 { 521 struct net_device *master_dev; 522 523 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 524 if (master_dev && master_dev->rtnl_link_ops) 525 return true; 526 return false; 527 } 528 529 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 530 const struct net_device *dev) 531 { 532 struct net_device *master_dev; 533 const struct rtnl_link_ops *ops; 534 struct nlattr *slave_data; 535 int err; 536 537 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 538 if (!master_dev) 539 return 0; 540 ops = master_dev->rtnl_link_ops; 541 if (!ops) 542 return 0; 543 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 544 return -EMSGSIZE; 545 if (ops->fill_slave_info) { 546 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA); 547 if (!slave_data) 548 return -EMSGSIZE; 549 err = ops->fill_slave_info(skb, master_dev, dev); 550 if (err < 0) 551 goto err_cancel_slave_data; 552 nla_nest_end(skb, slave_data); 553 } 554 return 0; 555 556 err_cancel_slave_data: 557 nla_nest_cancel(skb, slave_data); 558 return err; 559 } 560 561 static int rtnl_link_info_fill(struct sk_buff *skb, 562 const struct net_device *dev) 563 { 564 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 565 struct nlattr *data; 566 int err; 567 568 if (!ops) 569 return 0; 570 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 571 return -EMSGSIZE; 572 if (ops->fill_xstats) { 573 err = ops->fill_xstats(skb, dev); 574 if (err < 0) 575 return err; 576 } 577 if (ops->fill_info) { 578 data = nla_nest_start(skb, IFLA_INFO_DATA); 579 if (data == NULL) 580 return -EMSGSIZE; 581 err = ops->fill_info(skb, dev); 582 if (err < 0) 583 goto err_cancel_data; 584 nla_nest_end(skb, data); 585 } 586 return 0; 587 588 err_cancel_data: 589 nla_nest_cancel(skb, data); 590 return err; 591 } 592 593 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 594 { 595 struct nlattr *linkinfo; 596 int err = -EMSGSIZE; 597 598 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 599 if (linkinfo == NULL) 600 goto out; 601 602 err = rtnl_link_info_fill(skb, dev); 603 if (err < 0) 604 goto err_cancel_link; 605 606 err = rtnl_link_slave_info_fill(skb, dev); 607 if (err < 0) 608 goto err_cancel_link; 609 610 nla_nest_end(skb, linkinfo); 611 return 0; 612 613 err_cancel_link: 614 nla_nest_cancel(skb, linkinfo); 615 out: 616 return err; 617 } 618 619 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 620 { 621 struct sock *rtnl = net->rtnl; 622 int err = 0; 623 624 NETLINK_CB(skb).dst_group = group; 625 if (echo) 626 atomic_inc(&skb->users); 627 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 628 if (echo) 629 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 630 return err; 631 } 632 633 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 634 { 635 struct sock *rtnl = net->rtnl; 636 637 return nlmsg_unicast(rtnl, skb, pid); 638 } 639 EXPORT_SYMBOL(rtnl_unicast); 640 641 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 642 struct nlmsghdr *nlh, gfp_t flags) 643 { 644 struct sock *rtnl = net->rtnl; 645 int report = 0; 646 647 if (nlh) 648 report = nlmsg_report(nlh); 649 650 nlmsg_notify(rtnl, skb, pid, group, report, flags); 651 } 652 EXPORT_SYMBOL(rtnl_notify); 653 654 void rtnl_set_sk_err(struct net *net, u32 group, int error) 655 { 656 struct sock *rtnl = net->rtnl; 657 658 netlink_set_err(rtnl, 0, group, error); 659 } 660 EXPORT_SYMBOL(rtnl_set_sk_err); 661 662 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 663 { 664 struct nlattr *mx; 665 int i, valid = 0; 666 667 mx = nla_nest_start(skb, RTA_METRICS); 668 if (mx == NULL) 669 return -ENOBUFS; 670 671 for (i = 0; i < RTAX_MAX; i++) { 672 if (metrics[i]) { 673 if (i == RTAX_CC_ALGO - 1) { 674 char tmp[TCP_CA_NAME_MAX], *name; 675 676 name = tcp_ca_get_name_by_key(metrics[i], tmp); 677 if (!name) 678 continue; 679 if (nla_put_string(skb, i + 1, name)) 680 goto nla_put_failure; 681 } else { 682 if (nla_put_u32(skb, i + 1, metrics[i])) 683 goto nla_put_failure; 684 } 685 valid++; 686 } 687 } 688 689 if (!valid) { 690 nla_nest_cancel(skb, mx); 691 return 0; 692 } 693 694 return nla_nest_end(skb, mx); 695 696 nla_put_failure: 697 nla_nest_cancel(skb, mx); 698 return -EMSGSIZE; 699 } 700 EXPORT_SYMBOL(rtnetlink_put_metrics); 701 702 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 703 long expires, u32 error) 704 { 705 struct rta_cacheinfo ci = { 706 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 707 .rta_used = dst->__use, 708 .rta_clntref = atomic_read(&(dst->__refcnt)), 709 .rta_error = error, 710 .rta_id = id, 711 }; 712 713 if (expires) { 714 unsigned long clock; 715 716 clock = jiffies_to_clock_t(abs(expires)); 717 clock = min_t(unsigned long, clock, INT_MAX); 718 ci.rta_expires = (expires > 0) ? clock : -clock; 719 } 720 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 721 } 722 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 723 724 static void set_operstate(struct net_device *dev, unsigned char transition) 725 { 726 unsigned char operstate = dev->operstate; 727 728 switch (transition) { 729 case IF_OPER_UP: 730 if ((operstate == IF_OPER_DORMANT || 731 operstate == IF_OPER_UNKNOWN) && 732 !netif_dormant(dev)) 733 operstate = IF_OPER_UP; 734 break; 735 736 case IF_OPER_DORMANT: 737 if (operstate == IF_OPER_UP || 738 operstate == IF_OPER_UNKNOWN) 739 operstate = IF_OPER_DORMANT; 740 break; 741 } 742 743 if (dev->operstate != operstate) { 744 write_lock_bh(&dev_base_lock); 745 dev->operstate = operstate; 746 write_unlock_bh(&dev_base_lock); 747 netdev_state_change(dev); 748 } 749 } 750 751 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 752 { 753 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 754 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 755 } 756 757 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 758 const struct ifinfomsg *ifm) 759 { 760 unsigned int flags = ifm->ifi_flags; 761 762 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 763 if (ifm->ifi_change) 764 flags = (flags & ifm->ifi_change) | 765 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 766 767 return flags; 768 } 769 770 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 771 const struct rtnl_link_stats64 *b) 772 { 773 a->rx_packets = b->rx_packets; 774 a->tx_packets = b->tx_packets; 775 a->rx_bytes = b->rx_bytes; 776 a->tx_bytes = b->tx_bytes; 777 a->rx_errors = b->rx_errors; 778 a->tx_errors = b->tx_errors; 779 a->rx_dropped = b->rx_dropped; 780 a->tx_dropped = b->tx_dropped; 781 782 a->multicast = b->multicast; 783 a->collisions = b->collisions; 784 785 a->rx_length_errors = b->rx_length_errors; 786 a->rx_over_errors = b->rx_over_errors; 787 a->rx_crc_errors = b->rx_crc_errors; 788 a->rx_frame_errors = b->rx_frame_errors; 789 a->rx_fifo_errors = b->rx_fifo_errors; 790 a->rx_missed_errors = b->rx_missed_errors; 791 792 a->tx_aborted_errors = b->tx_aborted_errors; 793 a->tx_carrier_errors = b->tx_carrier_errors; 794 a->tx_fifo_errors = b->tx_fifo_errors; 795 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 796 a->tx_window_errors = b->tx_window_errors; 797 798 a->rx_compressed = b->rx_compressed; 799 a->tx_compressed = b->tx_compressed; 800 } 801 802 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 803 { 804 memcpy(v, b, sizeof(*b)); 805 } 806 807 /* All VF info */ 808 static inline int rtnl_vfinfo_size(const struct net_device *dev, 809 u32 ext_filter_mask) 810 { 811 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 812 (ext_filter_mask & RTEXT_FILTER_VF)) { 813 int num_vfs = dev_num_vf(dev->dev.parent); 814 size_t size = nla_total_size(sizeof(struct nlattr)); 815 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 816 size += num_vfs * 817 (nla_total_size(sizeof(struct ifla_vf_mac)) + 818 nla_total_size(sizeof(struct ifla_vf_vlan)) + 819 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 820 nla_total_size(sizeof(struct ifla_vf_rate)) + 821 nla_total_size(sizeof(struct ifla_vf_link_state)) + 822 nla_total_size(sizeof(struct ifla_vf_rss_query_en))); 823 return size; 824 } else 825 return 0; 826 } 827 828 static size_t rtnl_port_size(const struct net_device *dev, 829 u32 ext_filter_mask) 830 { 831 size_t port_size = nla_total_size(4) /* PORT_VF */ 832 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 833 + nla_total_size(sizeof(struct ifla_port_vsi)) 834 /* PORT_VSI_TYPE */ 835 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 836 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 837 + nla_total_size(1) /* PROT_VDP_REQUEST */ 838 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 839 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 840 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 841 + port_size; 842 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 843 + port_size; 844 845 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 846 !(ext_filter_mask & RTEXT_FILTER_VF)) 847 return 0; 848 if (dev_num_vf(dev->dev.parent)) 849 return port_self_size + vf_ports_size + 850 vf_port_size * dev_num_vf(dev->dev.parent); 851 else 852 return port_self_size; 853 } 854 855 static noinline size_t if_nlmsg_size(const struct net_device *dev, 856 u32 ext_filter_mask) 857 { 858 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 859 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 860 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 861 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 862 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 863 + nla_total_size(sizeof(struct rtnl_link_stats)) 864 + nla_total_size(sizeof(struct rtnl_link_stats64)) 865 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 866 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 867 + nla_total_size(4) /* IFLA_TXQLEN */ 868 + nla_total_size(4) /* IFLA_WEIGHT */ 869 + nla_total_size(4) /* IFLA_MTU */ 870 + nla_total_size(4) /* IFLA_LINK */ 871 + nla_total_size(4) /* IFLA_MASTER */ 872 + nla_total_size(1) /* IFLA_CARRIER */ 873 + nla_total_size(4) /* IFLA_PROMISCUITY */ 874 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 875 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 876 + nla_total_size(1) /* IFLA_OPERSTATE */ 877 + nla_total_size(1) /* IFLA_LINKMODE */ 878 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 879 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 880 + nla_total_size(ext_filter_mask 881 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 882 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 883 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 884 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 885 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */ 886 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 887 + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_SWITCH_ID */ 888 } 889 890 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 891 { 892 struct nlattr *vf_ports; 893 struct nlattr *vf_port; 894 int vf; 895 int err; 896 897 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 898 if (!vf_ports) 899 return -EMSGSIZE; 900 901 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 902 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 903 if (!vf_port) 904 goto nla_put_failure; 905 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 906 goto nla_put_failure; 907 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 908 if (err == -EMSGSIZE) 909 goto nla_put_failure; 910 if (err) { 911 nla_nest_cancel(skb, vf_port); 912 continue; 913 } 914 nla_nest_end(skb, vf_port); 915 } 916 917 nla_nest_end(skb, vf_ports); 918 919 return 0; 920 921 nla_put_failure: 922 nla_nest_cancel(skb, vf_ports); 923 return -EMSGSIZE; 924 } 925 926 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 927 { 928 struct nlattr *port_self; 929 int err; 930 931 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 932 if (!port_self) 933 return -EMSGSIZE; 934 935 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 936 if (err) { 937 nla_nest_cancel(skb, port_self); 938 return (err == -EMSGSIZE) ? err : 0; 939 } 940 941 nla_nest_end(skb, port_self); 942 943 return 0; 944 } 945 946 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 947 u32 ext_filter_mask) 948 { 949 int err; 950 951 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 952 !(ext_filter_mask & RTEXT_FILTER_VF)) 953 return 0; 954 955 err = rtnl_port_self_fill(skb, dev); 956 if (err) 957 return err; 958 959 if (dev_num_vf(dev->dev.parent)) { 960 err = rtnl_vf_ports_fill(skb, dev); 961 if (err) 962 return err; 963 } 964 965 return 0; 966 } 967 968 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 969 { 970 int err; 971 struct netdev_phys_item_id ppid; 972 973 err = dev_get_phys_port_id(dev, &ppid); 974 if (err) { 975 if (err == -EOPNOTSUPP) 976 return 0; 977 return err; 978 } 979 980 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 981 return -EMSGSIZE; 982 983 return 0; 984 } 985 986 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 987 { 988 char name[IFNAMSIZ]; 989 int err; 990 991 err = dev_get_phys_port_name(dev, name, sizeof(name)); 992 if (err) { 993 if (err == -EOPNOTSUPP) 994 return 0; 995 return err; 996 } 997 998 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 999 return -EMSGSIZE; 1000 1001 return 0; 1002 } 1003 1004 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1005 { 1006 int err; 1007 struct netdev_phys_item_id psid; 1008 1009 err = netdev_switch_parent_id_get(dev, &psid); 1010 if (err) { 1011 if (err == -EOPNOTSUPP) 1012 return 0; 1013 return err; 1014 } 1015 1016 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, psid.id_len, psid.id)) 1017 return -EMSGSIZE; 1018 1019 return 0; 1020 } 1021 1022 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1023 int type, u32 pid, u32 seq, u32 change, 1024 unsigned int flags, u32 ext_filter_mask) 1025 { 1026 struct ifinfomsg *ifm; 1027 struct nlmsghdr *nlh; 1028 struct rtnl_link_stats64 temp; 1029 const struct rtnl_link_stats64 *stats; 1030 struct nlattr *attr, *af_spec; 1031 struct rtnl_af_ops *af_ops; 1032 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1033 1034 ASSERT_RTNL(); 1035 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1036 if (nlh == NULL) 1037 return -EMSGSIZE; 1038 1039 ifm = nlmsg_data(nlh); 1040 ifm->ifi_family = AF_UNSPEC; 1041 ifm->__ifi_pad = 0; 1042 ifm->ifi_type = dev->type; 1043 ifm->ifi_index = dev->ifindex; 1044 ifm->ifi_flags = dev_get_flags(dev); 1045 ifm->ifi_change = change; 1046 1047 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1048 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1049 nla_put_u8(skb, IFLA_OPERSTATE, 1050 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1051 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1052 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1053 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1054 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1055 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1056 #ifdef CONFIG_RPS 1057 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1058 #endif 1059 (dev->ifindex != dev_get_iflink(dev) && 1060 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1061 (upper_dev && 1062 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1063 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1064 (dev->qdisc && 1065 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1066 (dev->ifalias && 1067 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1068 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1069 atomic_read(&dev->carrier_changes))) 1070 goto nla_put_failure; 1071 1072 if (1) { 1073 struct rtnl_link_ifmap map = { 1074 .mem_start = dev->mem_start, 1075 .mem_end = dev->mem_end, 1076 .base_addr = dev->base_addr, 1077 .irq = dev->irq, 1078 .dma = dev->dma, 1079 .port = dev->if_port, 1080 }; 1081 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1082 goto nla_put_failure; 1083 } 1084 1085 if (dev->addr_len) { 1086 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1087 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1088 goto nla_put_failure; 1089 } 1090 1091 if (rtnl_phys_port_id_fill(skb, dev)) 1092 goto nla_put_failure; 1093 1094 if (rtnl_phys_port_name_fill(skb, dev)) 1095 goto nla_put_failure; 1096 1097 if (rtnl_phys_switch_id_fill(skb, dev)) 1098 goto nla_put_failure; 1099 1100 attr = nla_reserve(skb, IFLA_STATS, 1101 sizeof(struct rtnl_link_stats)); 1102 if (attr == NULL) 1103 goto nla_put_failure; 1104 1105 stats = dev_get_stats(dev, &temp); 1106 copy_rtnl_link_stats(nla_data(attr), stats); 1107 1108 attr = nla_reserve(skb, IFLA_STATS64, 1109 sizeof(struct rtnl_link_stats64)); 1110 if (attr == NULL) 1111 goto nla_put_failure; 1112 copy_rtnl_link_stats64(nla_data(attr), stats); 1113 1114 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1115 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1116 goto nla_put_failure; 1117 1118 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 1119 && (ext_filter_mask & RTEXT_FILTER_VF)) { 1120 int i; 1121 1122 struct nlattr *vfinfo, *vf; 1123 int num_vfs = dev_num_vf(dev->dev.parent); 1124 1125 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1126 if (!vfinfo) 1127 goto nla_put_failure; 1128 for (i = 0; i < num_vfs; i++) { 1129 struct ifla_vf_info ivi; 1130 struct ifla_vf_mac vf_mac; 1131 struct ifla_vf_vlan vf_vlan; 1132 struct ifla_vf_rate vf_rate; 1133 struct ifla_vf_tx_rate vf_tx_rate; 1134 struct ifla_vf_spoofchk vf_spoofchk; 1135 struct ifla_vf_link_state vf_linkstate; 1136 struct ifla_vf_rss_query_en vf_rss_query_en; 1137 1138 /* 1139 * Not all SR-IOV capable drivers support the 1140 * spoofcheck and "RSS query enable" query. Preset to 1141 * -1 so the user space tool can detect that the driver 1142 * didn't report anything. 1143 */ 1144 ivi.spoofchk = -1; 1145 ivi.rss_query_en = -1; 1146 memset(ivi.mac, 0, sizeof(ivi.mac)); 1147 /* The default value for VF link state is "auto" 1148 * IFLA_VF_LINK_STATE_AUTO which equals zero 1149 */ 1150 ivi.linkstate = 0; 1151 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 1152 break; 1153 vf_mac.vf = 1154 vf_vlan.vf = 1155 vf_rate.vf = 1156 vf_tx_rate.vf = 1157 vf_spoofchk.vf = 1158 vf_linkstate.vf = 1159 vf_rss_query_en.vf = ivi.vf; 1160 1161 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1162 vf_vlan.vlan = ivi.vlan; 1163 vf_vlan.qos = ivi.qos; 1164 vf_tx_rate.rate = ivi.max_tx_rate; 1165 vf_rate.min_tx_rate = ivi.min_tx_rate; 1166 vf_rate.max_tx_rate = ivi.max_tx_rate; 1167 vf_spoofchk.setting = ivi.spoofchk; 1168 vf_linkstate.link_state = ivi.linkstate; 1169 vf_rss_query_en.setting = ivi.rss_query_en; 1170 vf = nla_nest_start(skb, IFLA_VF_INFO); 1171 if (!vf) { 1172 nla_nest_cancel(skb, vfinfo); 1173 goto nla_put_failure; 1174 } 1175 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1176 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1177 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1178 &vf_rate) || 1179 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1180 &vf_tx_rate) || 1181 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1182 &vf_spoofchk) || 1183 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1184 &vf_linkstate) || 1185 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1186 sizeof(vf_rss_query_en), 1187 &vf_rss_query_en)) 1188 goto nla_put_failure; 1189 nla_nest_end(skb, vf); 1190 } 1191 nla_nest_end(skb, vfinfo); 1192 } 1193 1194 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1195 goto nla_put_failure; 1196 1197 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1198 if (rtnl_link_fill(skb, dev) < 0) 1199 goto nla_put_failure; 1200 } 1201 1202 if (dev->rtnl_link_ops && 1203 dev->rtnl_link_ops->get_link_net) { 1204 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1205 1206 if (!net_eq(dev_net(dev), link_net)) { 1207 int id = peernet2id(dev_net(dev), link_net); 1208 1209 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1210 goto nla_put_failure; 1211 } 1212 } 1213 1214 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1215 goto nla_put_failure; 1216 1217 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1218 if (af_ops->fill_link_af) { 1219 struct nlattr *af; 1220 int err; 1221 1222 if (!(af = nla_nest_start(skb, af_ops->family))) 1223 goto nla_put_failure; 1224 1225 err = af_ops->fill_link_af(skb, dev); 1226 1227 /* 1228 * Caller may return ENODATA to indicate that there 1229 * was no data to be dumped. This is not an error, it 1230 * means we should trim the attribute header and 1231 * continue. 1232 */ 1233 if (err == -ENODATA) 1234 nla_nest_cancel(skb, af); 1235 else if (err < 0) 1236 goto nla_put_failure; 1237 1238 nla_nest_end(skb, af); 1239 } 1240 } 1241 1242 nla_nest_end(skb, af_spec); 1243 1244 nlmsg_end(skb, nlh); 1245 return 0; 1246 1247 nla_put_failure: 1248 nlmsg_cancel(skb, nlh); 1249 return -EMSGSIZE; 1250 } 1251 1252 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1253 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1254 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1255 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1256 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1257 [IFLA_MTU] = { .type = NLA_U32 }, 1258 [IFLA_LINK] = { .type = NLA_U32 }, 1259 [IFLA_MASTER] = { .type = NLA_U32 }, 1260 [IFLA_CARRIER] = { .type = NLA_U8 }, 1261 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1262 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1263 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1264 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1265 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1266 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1267 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1268 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1269 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1270 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1271 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1272 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1273 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1274 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1275 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1276 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1277 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1278 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1279 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1280 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1281 }; 1282 1283 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1284 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1285 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1286 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1287 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1288 }; 1289 1290 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1291 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1292 }; 1293 1294 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1295 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1296 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1297 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1298 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1299 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1300 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1301 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1302 }; 1303 1304 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1305 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1306 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1307 .len = PORT_PROFILE_MAX }, 1308 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1309 .len = sizeof(struct ifla_port_vsi)}, 1310 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1311 .len = PORT_UUID_MAX }, 1312 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1313 .len = PORT_UUID_MAX }, 1314 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1315 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1316 }; 1317 1318 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1319 { 1320 struct net *net = sock_net(skb->sk); 1321 int h, s_h; 1322 int idx = 0, s_idx; 1323 struct net_device *dev; 1324 struct hlist_head *head; 1325 struct nlattr *tb[IFLA_MAX+1]; 1326 u32 ext_filter_mask = 0; 1327 int err; 1328 int hdrlen; 1329 1330 s_h = cb->args[0]; 1331 s_idx = cb->args[1]; 1332 1333 cb->seq = net->dev_base_seq; 1334 1335 /* A hack to preserve kernel<->userspace interface. 1336 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1337 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1338 * what iproute2 < v3.9.0 used. 1339 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1340 * attribute, its netlink message is shorter than struct ifinfomsg. 1341 */ 1342 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1343 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1344 1345 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1346 1347 if (tb[IFLA_EXT_MASK]) 1348 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1349 } 1350 1351 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1352 idx = 0; 1353 head = &net->dev_index_head[h]; 1354 hlist_for_each_entry(dev, head, index_hlist) { 1355 if (idx < s_idx) 1356 goto cont; 1357 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1358 NETLINK_CB(cb->skb).portid, 1359 cb->nlh->nlmsg_seq, 0, 1360 NLM_F_MULTI, 1361 ext_filter_mask); 1362 /* If we ran out of room on the first message, 1363 * we're in trouble 1364 */ 1365 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1366 1367 if (err < 0) 1368 goto out; 1369 1370 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1371 cont: 1372 idx++; 1373 } 1374 } 1375 out: 1376 cb->args[1] = idx; 1377 cb->args[0] = h; 1378 1379 return skb->len; 1380 } 1381 1382 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1383 { 1384 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1385 } 1386 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1387 1388 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1389 { 1390 struct net *net; 1391 /* Examine the link attributes and figure out which 1392 * network namespace we are talking about. 1393 */ 1394 if (tb[IFLA_NET_NS_PID]) 1395 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1396 else if (tb[IFLA_NET_NS_FD]) 1397 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1398 else 1399 net = get_net(src_net); 1400 return net; 1401 } 1402 EXPORT_SYMBOL(rtnl_link_get_net); 1403 1404 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1405 { 1406 if (dev) { 1407 if (tb[IFLA_ADDRESS] && 1408 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1409 return -EINVAL; 1410 1411 if (tb[IFLA_BROADCAST] && 1412 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1413 return -EINVAL; 1414 } 1415 1416 if (tb[IFLA_AF_SPEC]) { 1417 struct nlattr *af; 1418 int rem, err; 1419 1420 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1421 const struct rtnl_af_ops *af_ops; 1422 1423 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1424 return -EAFNOSUPPORT; 1425 1426 if (!af_ops->set_link_af) 1427 return -EOPNOTSUPP; 1428 1429 if (af_ops->validate_link_af) { 1430 err = af_ops->validate_link_af(dev, af); 1431 if (err < 0) 1432 return err; 1433 } 1434 } 1435 } 1436 1437 return 0; 1438 } 1439 1440 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1441 { 1442 int rem, err = -EINVAL; 1443 struct nlattr *vf; 1444 const struct net_device_ops *ops = dev->netdev_ops; 1445 1446 nla_for_each_nested(vf, attr, rem) { 1447 switch (nla_type(vf)) { 1448 case IFLA_VF_MAC: { 1449 struct ifla_vf_mac *ivm; 1450 ivm = nla_data(vf); 1451 err = -EOPNOTSUPP; 1452 if (ops->ndo_set_vf_mac) 1453 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1454 ivm->mac); 1455 break; 1456 } 1457 case IFLA_VF_VLAN: { 1458 struct ifla_vf_vlan *ivv; 1459 ivv = nla_data(vf); 1460 err = -EOPNOTSUPP; 1461 if (ops->ndo_set_vf_vlan) 1462 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1463 ivv->vlan, 1464 ivv->qos); 1465 break; 1466 } 1467 case IFLA_VF_TX_RATE: { 1468 struct ifla_vf_tx_rate *ivt; 1469 struct ifla_vf_info ivf; 1470 ivt = nla_data(vf); 1471 err = -EOPNOTSUPP; 1472 if (ops->ndo_get_vf_config) 1473 err = ops->ndo_get_vf_config(dev, ivt->vf, 1474 &ivf); 1475 if (err) 1476 break; 1477 err = -EOPNOTSUPP; 1478 if (ops->ndo_set_vf_rate) 1479 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1480 ivf.min_tx_rate, 1481 ivt->rate); 1482 break; 1483 } 1484 case IFLA_VF_RATE: { 1485 struct ifla_vf_rate *ivt; 1486 ivt = nla_data(vf); 1487 err = -EOPNOTSUPP; 1488 if (ops->ndo_set_vf_rate) 1489 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1490 ivt->min_tx_rate, 1491 ivt->max_tx_rate); 1492 break; 1493 } 1494 case IFLA_VF_SPOOFCHK: { 1495 struct ifla_vf_spoofchk *ivs; 1496 ivs = nla_data(vf); 1497 err = -EOPNOTSUPP; 1498 if (ops->ndo_set_vf_spoofchk) 1499 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1500 ivs->setting); 1501 break; 1502 } 1503 case IFLA_VF_LINK_STATE: { 1504 struct ifla_vf_link_state *ivl; 1505 ivl = nla_data(vf); 1506 err = -EOPNOTSUPP; 1507 if (ops->ndo_set_vf_link_state) 1508 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1509 ivl->link_state); 1510 break; 1511 } 1512 case IFLA_VF_RSS_QUERY_EN: { 1513 struct ifla_vf_rss_query_en *ivrssq_en; 1514 1515 ivrssq_en = nla_data(vf); 1516 err = -EOPNOTSUPP; 1517 if (ops->ndo_set_vf_rss_query_en) 1518 err = ops->ndo_set_vf_rss_query_en(dev, 1519 ivrssq_en->vf, 1520 ivrssq_en->setting); 1521 break; 1522 } 1523 default: 1524 err = -EINVAL; 1525 break; 1526 } 1527 if (err) 1528 break; 1529 } 1530 return err; 1531 } 1532 1533 static int do_set_master(struct net_device *dev, int ifindex) 1534 { 1535 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1536 const struct net_device_ops *ops; 1537 int err; 1538 1539 if (upper_dev) { 1540 if (upper_dev->ifindex == ifindex) 1541 return 0; 1542 ops = upper_dev->netdev_ops; 1543 if (ops->ndo_del_slave) { 1544 err = ops->ndo_del_slave(upper_dev, dev); 1545 if (err) 1546 return err; 1547 } else { 1548 return -EOPNOTSUPP; 1549 } 1550 } 1551 1552 if (ifindex) { 1553 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1554 if (!upper_dev) 1555 return -EINVAL; 1556 ops = upper_dev->netdev_ops; 1557 if (ops->ndo_add_slave) { 1558 err = ops->ndo_add_slave(upper_dev, dev); 1559 if (err) 1560 return err; 1561 } else { 1562 return -EOPNOTSUPP; 1563 } 1564 } 1565 return 0; 1566 } 1567 1568 #define DO_SETLINK_MODIFIED 0x01 1569 /* notify flag means notify + modified. */ 1570 #define DO_SETLINK_NOTIFY 0x03 1571 static int do_setlink(const struct sk_buff *skb, 1572 struct net_device *dev, struct ifinfomsg *ifm, 1573 struct nlattr **tb, char *ifname, int status) 1574 { 1575 const struct net_device_ops *ops = dev->netdev_ops; 1576 int err; 1577 1578 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1579 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1580 if (IS_ERR(net)) { 1581 err = PTR_ERR(net); 1582 goto errout; 1583 } 1584 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1585 put_net(net); 1586 err = -EPERM; 1587 goto errout; 1588 } 1589 err = dev_change_net_namespace(dev, net, ifname); 1590 put_net(net); 1591 if (err) 1592 goto errout; 1593 status |= DO_SETLINK_MODIFIED; 1594 } 1595 1596 if (tb[IFLA_MAP]) { 1597 struct rtnl_link_ifmap *u_map; 1598 struct ifmap k_map; 1599 1600 if (!ops->ndo_set_config) { 1601 err = -EOPNOTSUPP; 1602 goto errout; 1603 } 1604 1605 if (!netif_device_present(dev)) { 1606 err = -ENODEV; 1607 goto errout; 1608 } 1609 1610 u_map = nla_data(tb[IFLA_MAP]); 1611 k_map.mem_start = (unsigned long) u_map->mem_start; 1612 k_map.mem_end = (unsigned long) u_map->mem_end; 1613 k_map.base_addr = (unsigned short) u_map->base_addr; 1614 k_map.irq = (unsigned char) u_map->irq; 1615 k_map.dma = (unsigned char) u_map->dma; 1616 k_map.port = (unsigned char) u_map->port; 1617 1618 err = ops->ndo_set_config(dev, &k_map); 1619 if (err < 0) 1620 goto errout; 1621 1622 status |= DO_SETLINK_NOTIFY; 1623 } 1624 1625 if (tb[IFLA_ADDRESS]) { 1626 struct sockaddr *sa; 1627 int len; 1628 1629 len = sizeof(sa_family_t) + dev->addr_len; 1630 sa = kmalloc(len, GFP_KERNEL); 1631 if (!sa) { 1632 err = -ENOMEM; 1633 goto errout; 1634 } 1635 sa->sa_family = dev->type; 1636 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1637 dev->addr_len); 1638 err = dev_set_mac_address(dev, sa); 1639 kfree(sa); 1640 if (err) 1641 goto errout; 1642 status |= DO_SETLINK_MODIFIED; 1643 } 1644 1645 if (tb[IFLA_MTU]) { 1646 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1647 if (err < 0) 1648 goto errout; 1649 status |= DO_SETLINK_MODIFIED; 1650 } 1651 1652 if (tb[IFLA_GROUP]) { 1653 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1654 status |= DO_SETLINK_NOTIFY; 1655 } 1656 1657 /* 1658 * Interface selected by interface index but interface 1659 * name provided implies that a name change has been 1660 * requested. 1661 */ 1662 if (ifm->ifi_index > 0 && ifname[0]) { 1663 err = dev_change_name(dev, ifname); 1664 if (err < 0) 1665 goto errout; 1666 status |= DO_SETLINK_MODIFIED; 1667 } 1668 1669 if (tb[IFLA_IFALIAS]) { 1670 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1671 nla_len(tb[IFLA_IFALIAS])); 1672 if (err < 0) 1673 goto errout; 1674 status |= DO_SETLINK_NOTIFY; 1675 } 1676 1677 if (tb[IFLA_BROADCAST]) { 1678 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1679 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1680 } 1681 1682 if (ifm->ifi_flags || ifm->ifi_change) { 1683 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1684 if (err < 0) 1685 goto errout; 1686 } 1687 1688 if (tb[IFLA_MASTER]) { 1689 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1690 if (err) 1691 goto errout; 1692 status |= DO_SETLINK_MODIFIED; 1693 } 1694 1695 if (tb[IFLA_CARRIER]) { 1696 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1697 if (err) 1698 goto errout; 1699 status |= DO_SETLINK_MODIFIED; 1700 } 1701 1702 if (tb[IFLA_TXQLEN]) { 1703 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1704 1705 if (dev->tx_queue_len ^ value) 1706 status |= DO_SETLINK_NOTIFY; 1707 1708 dev->tx_queue_len = value; 1709 } 1710 1711 if (tb[IFLA_OPERSTATE]) 1712 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1713 1714 if (tb[IFLA_LINKMODE]) { 1715 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1716 1717 write_lock_bh(&dev_base_lock); 1718 if (dev->link_mode ^ value) 1719 status |= DO_SETLINK_NOTIFY; 1720 dev->link_mode = value; 1721 write_unlock_bh(&dev_base_lock); 1722 } 1723 1724 if (tb[IFLA_VFINFO_LIST]) { 1725 struct nlattr *attr; 1726 int rem; 1727 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1728 if (nla_type(attr) != IFLA_VF_INFO) { 1729 err = -EINVAL; 1730 goto errout; 1731 } 1732 err = do_setvfinfo(dev, attr); 1733 if (err < 0) 1734 goto errout; 1735 status |= DO_SETLINK_NOTIFY; 1736 } 1737 } 1738 err = 0; 1739 1740 if (tb[IFLA_VF_PORTS]) { 1741 struct nlattr *port[IFLA_PORT_MAX+1]; 1742 struct nlattr *attr; 1743 int vf; 1744 int rem; 1745 1746 err = -EOPNOTSUPP; 1747 if (!ops->ndo_set_vf_port) 1748 goto errout; 1749 1750 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1751 if (nla_type(attr) != IFLA_VF_PORT) 1752 continue; 1753 err = nla_parse_nested(port, IFLA_PORT_MAX, 1754 attr, ifla_port_policy); 1755 if (err < 0) 1756 goto errout; 1757 if (!port[IFLA_PORT_VF]) { 1758 err = -EOPNOTSUPP; 1759 goto errout; 1760 } 1761 vf = nla_get_u32(port[IFLA_PORT_VF]); 1762 err = ops->ndo_set_vf_port(dev, vf, port); 1763 if (err < 0) 1764 goto errout; 1765 status |= DO_SETLINK_NOTIFY; 1766 } 1767 } 1768 err = 0; 1769 1770 if (tb[IFLA_PORT_SELF]) { 1771 struct nlattr *port[IFLA_PORT_MAX+1]; 1772 1773 err = nla_parse_nested(port, IFLA_PORT_MAX, 1774 tb[IFLA_PORT_SELF], ifla_port_policy); 1775 if (err < 0) 1776 goto errout; 1777 1778 err = -EOPNOTSUPP; 1779 if (ops->ndo_set_vf_port) 1780 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1781 if (err < 0) 1782 goto errout; 1783 status |= DO_SETLINK_NOTIFY; 1784 } 1785 1786 if (tb[IFLA_AF_SPEC]) { 1787 struct nlattr *af; 1788 int rem; 1789 1790 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1791 const struct rtnl_af_ops *af_ops; 1792 1793 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1794 BUG(); 1795 1796 err = af_ops->set_link_af(dev, af); 1797 if (err < 0) 1798 goto errout; 1799 1800 status |= DO_SETLINK_NOTIFY; 1801 } 1802 } 1803 err = 0; 1804 1805 errout: 1806 if (status & DO_SETLINK_MODIFIED) { 1807 if (status & DO_SETLINK_NOTIFY) 1808 netdev_state_change(dev); 1809 1810 if (err < 0) 1811 net_warn_ratelimited("A link change request failed with some changes committed already. Interface %s may have been left with an inconsistent configuration, please check.\n", 1812 dev->name); 1813 } 1814 1815 return err; 1816 } 1817 1818 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1819 { 1820 struct net *net = sock_net(skb->sk); 1821 struct ifinfomsg *ifm; 1822 struct net_device *dev; 1823 int err; 1824 struct nlattr *tb[IFLA_MAX+1]; 1825 char ifname[IFNAMSIZ]; 1826 1827 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1828 if (err < 0) 1829 goto errout; 1830 1831 if (tb[IFLA_IFNAME]) 1832 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1833 else 1834 ifname[0] = '\0'; 1835 1836 err = -EINVAL; 1837 ifm = nlmsg_data(nlh); 1838 if (ifm->ifi_index > 0) 1839 dev = __dev_get_by_index(net, ifm->ifi_index); 1840 else if (tb[IFLA_IFNAME]) 1841 dev = __dev_get_by_name(net, ifname); 1842 else 1843 goto errout; 1844 1845 if (dev == NULL) { 1846 err = -ENODEV; 1847 goto errout; 1848 } 1849 1850 err = validate_linkmsg(dev, tb); 1851 if (err < 0) 1852 goto errout; 1853 1854 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 1855 errout: 1856 return err; 1857 } 1858 1859 static int rtnl_group_dellink(const struct net *net, int group) 1860 { 1861 struct net_device *dev, *aux; 1862 LIST_HEAD(list_kill); 1863 bool found = false; 1864 1865 if (!group) 1866 return -EPERM; 1867 1868 for_each_netdev(net, dev) { 1869 if (dev->group == group) { 1870 const struct rtnl_link_ops *ops; 1871 1872 found = true; 1873 ops = dev->rtnl_link_ops; 1874 if (!ops || !ops->dellink) 1875 return -EOPNOTSUPP; 1876 } 1877 } 1878 1879 if (!found) 1880 return -ENODEV; 1881 1882 for_each_netdev_safe(net, dev, aux) { 1883 if (dev->group == group) { 1884 const struct rtnl_link_ops *ops; 1885 1886 ops = dev->rtnl_link_ops; 1887 ops->dellink(dev, &list_kill); 1888 } 1889 } 1890 unregister_netdevice_many(&list_kill); 1891 1892 return 0; 1893 } 1894 1895 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1896 { 1897 struct net *net = sock_net(skb->sk); 1898 const struct rtnl_link_ops *ops; 1899 struct net_device *dev; 1900 struct ifinfomsg *ifm; 1901 char ifname[IFNAMSIZ]; 1902 struct nlattr *tb[IFLA_MAX+1]; 1903 int err; 1904 LIST_HEAD(list_kill); 1905 1906 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1907 if (err < 0) 1908 return err; 1909 1910 if (tb[IFLA_IFNAME]) 1911 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1912 1913 ifm = nlmsg_data(nlh); 1914 if (ifm->ifi_index > 0) 1915 dev = __dev_get_by_index(net, ifm->ifi_index); 1916 else if (tb[IFLA_IFNAME]) 1917 dev = __dev_get_by_name(net, ifname); 1918 else if (tb[IFLA_GROUP]) 1919 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 1920 else 1921 return -EINVAL; 1922 1923 if (!dev) 1924 return -ENODEV; 1925 1926 ops = dev->rtnl_link_ops; 1927 if (!ops || !ops->dellink) 1928 return -EOPNOTSUPP; 1929 1930 ops->dellink(dev, &list_kill); 1931 unregister_netdevice_many(&list_kill); 1932 return 0; 1933 } 1934 1935 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1936 { 1937 unsigned int old_flags; 1938 int err; 1939 1940 old_flags = dev->flags; 1941 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1942 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1943 if (err < 0) 1944 return err; 1945 } 1946 1947 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1948 1949 __dev_notify_flags(dev, old_flags, ~0U); 1950 return 0; 1951 } 1952 EXPORT_SYMBOL(rtnl_configure_link); 1953 1954 struct net_device *rtnl_create_link(struct net *net, 1955 const char *ifname, unsigned char name_assign_type, 1956 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1957 { 1958 int err; 1959 struct net_device *dev; 1960 unsigned int num_tx_queues = 1; 1961 unsigned int num_rx_queues = 1; 1962 1963 if (tb[IFLA_NUM_TX_QUEUES]) 1964 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1965 else if (ops->get_num_tx_queues) 1966 num_tx_queues = ops->get_num_tx_queues(); 1967 1968 if (tb[IFLA_NUM_RX_QUEUES]) 1969 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1970 else if (ops->get_num_rx_queues) 1971 num_rx_queues = ops->get_num_rx_queues(); 1972 1973 err = -ENOMEM; 1974 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 1975 ops->setup, num_tx_queues, num_rx_queues); 1976 if (!dev) 1977 goto err; 1978 1979 dev_net_set(dev, net); 1980 dev->rtnl_link_ops = ops; 1981 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1982 1983 if (tb[IFLA_MTU]) 1984 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1985 if (tb[IFLA_ADDRESS]) { 1986 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1987 nla_len(tb[IFLA_ADDRESS])); 1988 dev->addr_assign_type = NET_ADDR_SET; 1989 } 1990 if (tb[IFLA_BROADCAST]) 1991 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1992 nla_len(tb[IFLA_BROADCAST])); 1993 if (tb[IFLA_TXQLEN]) 1994 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1995 if (tb[IFLA_OPERSTATE]) 1996 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1997 if (tb[IFLA_LINKMODE]) 1998 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1999 if (tb[IFLA_GROUP]) 2000 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2001 2002 return dev; 2003 2004 err: 2005 return ERR_PTR(err); 2006 } 2007 EXPORT_SYMBOL(rtnl_create_link); 2008 2009 static int rtnl_group_changelink(const struct sk_buff *skb, 2010 struct net *net, int group, 2011 struct ifinfomsg *ifm, 2012 struct nlattr **tb) 2013 { 2014 struct net_device *dev, *aux; 2015 int err; 2016 2017 for_each_netdev_safe(net, dev, aux) { 2018 if (dev->group == group) { 2019 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2020 if (err < 0) 2021 return err; 2022 } 2023 } 2024 2025 return 0; 2026 } 2027 2028 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2029 { 2030 struct net *net = sock_net(skb->sk); 2031 const struct rtnl_link_ops *ops; 2032 const struct rtnl_link_ops *m_ops = NULL; 2033 struct net_device *dev; 2034 struct net_device *master_dev = NULL; 2035 struct ifinfomsg *ifm; 2036 char kind[MODULE_NAME_LEN]; 2037 char ifname[IFNAMSIZ]; 2038 struct nlattr *tb[IFLA_MAX+1]; 2039 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2040 unsigned char name_assign_type = NET_NAME_USER; 2041 int err; 2042 2043 #ifdef CONFIG_MODULES 2044 replay: 2045 #endif 2046 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2047 if (err < 0) 2048 return err; 2049 2050 if (tb[IFLA_IFNAME]) 2051 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2052 else 2053 ifname[0] = '\0'; 2054 2055 ifm = nlmsg_data(nlh); 2056 if (ifm->ifi_index > 0) 2057 dev = __dev_get_by_index(net, ifm->ifi_index); 2058 else { 2059 if (ifname[0]) 2060 dev = __dev_get_by_name(net, ifname); 2061 else 2062 dev = NULL; 2063 } 2064 2065 if (dev) { 2066 master_dev = netdev_master_upper_dev_get(dev); 2067 if (master_dev) 2068 m_ops = master_dev->rtnl_link_ops; 2069 } 2070 2071 err = validate_linkmsg(dev, tb); 2072 if (err < 0) 2073 return err; 2074 2075 if (tb[IFLA_LINKINFO]) { 2076 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2077 tb[IFLA_LINKINFO], ifla_info_policy); 2078 if (err < 0) 2079 return err; 2080 } else 2081 memset(linkinfo, 0, sizeof(linkinfo)); 2082 2083 if (linkinfo[IFLA_INFO_KIND]) { 2084 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2085 ops = rtnl_link_ops_get(kind); 2086 } else { 2087 kind[0] = '\0'; 2088 ops = NULL; 2089 } 2090 2091 if (1) { 2092 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2093 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2094 struct nlattr **data = NULL; 2095 struct nlattr **slave_data = NULL; 2096 struct net *dest_net, *link_net = NULL; 2097 2098 if (ops) { 2099 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2100 err = nla_parse_nested(attr, ops->maxtype, 2101 linkinfo[IFLA_INFO_DATA], 2102 ops->policy); 2103 if (err < 0) 2104 return err; 2105 data = attr; 2106 } 2107 if (ops->validate) { 2108 err = ops->validate(tb, data); 2109 if (err < 0) 2110 return err; 2111 } 2112 } 2113 2114 if (m_ops) { 2115 if (m_ops->slave_maxtype && 2116 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2117 err = nla_parse_nested(slave_attr, 2118 m_ops->slave_maxtype, 2119 linkinfo[IFLA_INFO_SLAVE_DATA], 2120 m_ops->slave_policy); 2121 if (err < 0) 2122 return err; 2123 slave_data = slave_attr; 2124 } 2125 if (m_ops->slave_validate) { 2126 err = m_ops->slave_validate(tb, slave_data); 2127 if (err < 0) 2128 return err; 2129 } 2130 } 2131 2132 if (dev) { 2133 int status = 0; 2134 2135 if (nlh->nlmsg_flags & NLM_F_EXCL) 2136 return -EEXIST; 2137 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2138 return -EOPNOTSUPP; 2139 2140 if (linkinfo[IFLA_INFO_DATA]) { 2141 if (!ops || ops != dev->rtnl_link_ops || 2142 !ops->changelink) 2143 return -EOPNOTSUPP; 2144 2145 err = ops->changelink(dev, tb, data); 2146 if (err < 0) 2147 return err; 2148 status |= DO_SETLINK_NOTIFY; 2149 } 2150 2151 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2152 if (!m_ops || !m_ops->slave_changelink) 2153 return -EOPNOTSUPP; 2154 2155 err = m_ops->slave_changelink(master_dev, dev, 2156 tb, slave_data); 2157 if (err < 0) 2158 return err; 2159 status |= DO_SETLINK_NOTIFY; 2160 } 2161 2162 return do_setlink(skb, dev, ifm, tb, ifname, status); 2163 } 2164 2165 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2166 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2167 return rtnl_group_changelink(skb, net, 2168 nla_get_u32(tb[IFLA_GROUP]), 2169 ifm, tb); 2170 return -ENODEV; 2171 } 2172 2173 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2174 return -EOPNOTSUPP; 2175 2176 if (!ops) { 2177 #ifdef CONFIG_MODULES 2178 if (kind[0]) { 2179 __rtnl_unlock(); 2180 request_module("rtnl-link-%s", kind); 2181 rtnl_lock(); 2182 ops = rtnl_link_ops_get(kind); 2183 if (ops) 2184 goto replay; 2185 } 2186 #endif 2187 return -EOPNOTSUPP; 2188 } 2189 2190 if (!ops->setup) 2191 return -EOPNOTSUPP; 2192 2193 if (!ifname[0]) { 2194 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2195 name_assign_type = NET_NAME_ENUM; 2196 } 2197 2198 dest_net = rtnl_link_get_net(net, tb); 2199 if (IS_ERR(dest_net)) 2200 return PTR_ERR(dest_net); 2201 2202 err = -EPERM; 2203 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2204 goto out; 2205 2206 if (tb[IFLA_LINK_NETNSID]) { 2207 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2208 2209 link_net = get_net_ns_by_id(dest_net, id); 2210 if (!link_net) { 2211 err = -EINVAL; 2212 goto out; 2213 } 2214 err = -EPERM; 2215 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2216 goto out; 2217 } 2218 2219 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2220 name_assign_type, ops, tb); 2221 if (IS_ERR(dev)) { 2222 err = PTR_ERR(dev); 2223 goto out; 2224 } 2225 2226 dev->ifindex = ifm->ifi_index; 2227 2228 if (ops->newlink) { 2229 err = ops->newlink(link_net ? : net, dev, tb, data); 2230 /* Drivers should call free_netdev() in ->destructor 2231 * and unregister it on failure after registration 2232 * so that device could be finally freed in rtnl_unlock. 2233 */ 2234 if (err < 0) { 2235 /* If device is not registered at all, free it now */ 2236 if (dev->reg_state == NETREG_UNINITIALIZED) 2237 free_netdev(dev); 2238 goto out; 2239 } 2240 } else { 2241 err = register_netdevice(dev); 2242 if (err < 0) { 2243 free_netdev(dev); 2244 goto out; 2245 } 2246 } 2247 err = rtnl_configure_link(dev, ifm); 2248 if (err < 0) 2249 goto out_unregister; 2250 if (link_net) { 2251 err = dev_change_net_namespace(dev, dest_net, ifname); 2252 if (err < 0) 2253 goto out_unregister; 2254 } 2255 out: 2256 if (link_net) 2257 put_net(link_net); 2258 put_net(dest_net); 2259 return err; 2260 out_unregister: 2261 if (ops->newlink) { 2262 LIST_HEAD(list_kill); 2263 2264 ops->dellink(dev, &list_kill); 2265 unregister_netdevice_many(&list_kill); 2266 } else { 2267 unregister_netdevice(dev); 2268 } 2269 goto out; 2270 } 2271 } 2272 2273 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2274 { 2275 struct net *net = sock_net(skb->sk); 2276 struct ifinfomsg *ifm; 2277 char ifname[IFNAMSIZ]; 2278 struct nlattr *tb[IFLA_MAX+1]; 2279 struct net_device *dev = NULL; 2280 struct sk_buff *nskb; 2281 int err; 2282 u32 ext_filter_mask = 0; 2283 2284 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2285 if (err < 0) 2286 return err; 2287 2288 if (tb[IFLA_IFNAME]) 2289 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2290 2291 if (tb[IFLA_EXT_MASK]) 2292 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2293 2294 ifm = nlmsg_data(nlh); 2295 if (ifm->ifi_index > 0) 2296 dev = __dev_get_by_index(net, ifm->ifi_index); 2297 else if (tb[IFLA_IFNAME]) 2298 dev = __dev_get_by_name(net, ifname); 2299 else 2300 return -EINVAL; 2301 2302 if (dev == NULL) 2303 return -ENODEV; 2304 2305 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2306 if (nskb == NULL) 2307 return -ENOBUFS; 2308 2309 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2310 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2311 if (err < 0) { 2312 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2313 WARN_ON(err == -EMSGSIZE); 2314 kfree_skb(nskb); 2315 } else 2316 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2317 2318 return err; 2319 } 2320 2321 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2322 { 2323 struct net *net = sock_net(skb->sk); 2324 struct net_device *dev; 2325 struct nlattr *tb[IFLA_MAX+1]; 2326 u32 ext_filter_mask = 0; 2327 u16 min_ifinfo_dump_size = 0; 2328 int hdrlen; 2329 2330 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2331 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2332 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2333 2334 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2335 if (tb[IFLA_EXT_MASK]) 2336 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2337 } 2338 2339 if (!ext_filter_mask) 2340 return NLMSG_GOODSIZE; 2341 /* 2342 * traverse the list of net devices and compute the minimum 2343 * buffer size based upon the filter mask. 2344 */ 2345 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2346 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2347 if_nlmsg_size(dev, 2348 ext_filter_mask)); 2349 } 2350 2351 return min_ifinfo_dump_size; 2352 } 2353 2354 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2355 { 2356 int idx; 2357 int s_idx = cb->family; 2358 2359 if (s_idx == 0) 2360 s_idx = 1; 2361 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2362 int type = cb->nlh->nlmsg_type-RTM_BASE; 2363 if (idx < s_idx || idx == PF_PACKET) 2364 continue; 2365 if (rtnl_msg_handlers[idx] == NULL || 2366 rtnl_msg_handlers[idx][type].dumpit == NULL) 2367 continue; 2368 if (idx > s_idx) { 2369 memset(&cb->args[0], 0, sizeof(cb->args)); 2370 cb->prev_seq = 0; 2371 cb->seq = 0; 2372 } 2373 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2374 break; 2375 } 2376 cb->family = idx; 2377 2378 return skb->len; 2379 } 2380 2381 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2382 unsigned int change, gfp_t flags) 2383 { 2384 struct net *net = dev_net(dev); 2385 struct sk_buff *skb; 2386 int err = -ENOBUFS; 2387 size_t if_info_size; 2388 2389 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2390 if (skb == NULL) 2391 goto errout; 2392 2393 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2394 if (err < 0) { 2395 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2396 WARN_ON(err == -EMSGSIZE); 2397 kfree_skb(skb); 2398 goto errout; 2399 } 2400 return skb; 2401 errout: 2402 if (err < 0) 2403 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2404 return NULL; 2405 } 2406 2407 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2408 { 2409 struct net *net = dev_net(dev); 2410 2411 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2412 } 2413 2414 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2415 gfp_t flags) 2416 { 2417 struct sk_buff *skb; 2418 2419 if (dev->reg_state != NETREG_REGISTERED) 2420 return; 2421 2422 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2423 if (skb) 2424 rtmsg_ifinfo_send(skb, dev, flags); 2425 } 2426 EXPORT_SYMBOL(rtmsg_ifinfo); 2427 2428 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2429 struct net_device *dev, 2430 u8 *addr, u16 vid, u32 pid, u32 seq, 2431 int type, unsigned int flags, 2432 int nlflags) 2433 { 2434 struct nlmsghdr *nlh; 2435 struct ndmsg *ndm; 2436 2437 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2438 if (!nlh) 2439 return -EMSGSIZE; 2440 2441 ndm = nlmsg_data(nlh); 2442 ndm->ndm_family = AF_BRIDGE; 2443 ndm->ndm_pad1 = 0; 2444 ndm->ndm_pad2 = 0; 2445 ndm->ndm_flags = flags; 2446 ndm->ndm_type = 0; 2447 ndm->ndm_ifindex = dev->ifindex; 2448 ndm->ndm_state = NUD_PERMANENT; 2449 2450 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2451 goto nla_put_failure; 2452 if (vid) 2453 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2454 goto nla_put_failure; 2455 2456 nlmsg_end(skb, nlh); 2457 return 0; 2458 2459 nla_put_failure: 2460 nlmsg_cancel(skb, nlh); 2461 return -EMSGSIZE; 2462 } 2463 2464 static inline size_t rtnl_fdb_nlmsg_size(void) 2465 { 2466 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2467 } 2468 2469 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type) 2470 { 2471 struct net *net = dev_net(dev); 2472 struct sk_buff *skb; 2473 int err = -ENOBUFS; 2474 2475 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2476 if (!skb) 2477 goto errout; 2478 2479 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2480 0, 0, type, NTF_SELF, 0); 2481 if (err < 0) { 2482 kfree_skb(skb); 2483 goto errout; 2484 } 2485 2486 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2487 return; 2488 errout: 2489 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2490 } 2491 2492 /** 2493 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2494 */ 2495 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2496 struct nlattr *tb[], 2497 struct net_device *dev, 2498 const unsigned char *addr, u16 vid, 2499 u16 flags) 2500 { 2501 int err = -EINVAL; 2502 2503 /* If aging addresses are supported device will need to 2504 * implement its own handler for this. 2505 */ 2506 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2507 pr_info("%s: FDB only supports static addresses\n", dev->name); 2508 return err; 2509 } 2510 2511 if (vid) { 2512 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2513 return err; 2514 } 2515 2516 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2517 err = dev_uc_add_excl(dev, addr); 2518 else if (is_multicast_ether_addr(addr)) 2519 err = dev_mc_add_excl(dev, addr); 2520 2521 /* Only return duplicate errors if NLM_F_EXCL is set */ 2522 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2523 err = 0; 2524 2525 return err; 2526 } 2527 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2528 2529 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2530 { 2531 u16 vid = 0; 2532 2533 if (vlan_attr) { 2534 if (nla_len(vlan_attr) != sizeof(u16)) { 2535 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2536 return -EINVAL; 2537 } 2538 2539 vid = nla_get_u16(vlan_attr); 2540 2541 if (!vid || vid >= VLAN_VID_MASK) { 2542 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2543 vid); 2544 return -EINVAL; 2545 } 2546 } 2547 *p_vid = vid; 2548 return 0; 2549 } 2550 2551 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2552 { 2553 struct net *net = sock_net(skb->sk); 2554 struct ndmsg *ndm; 2555 struct nlattr *tb[NDA_MAX+1]; 2556 struct net_device *dev; 2557 u8 *addr; 2558 u16 vid; 2559 int err; 2560 2561 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2562 if (err < 0) 2563 return err; 2564 2565 ndm = nlmsg_data(nlh); 2566 if (ndm->ndm_ifindex == 0) { 2567 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2568 return -EINVAL; 2569 } 2570 2571 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2572 if (dev == NULL) { 2573 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2574 return -ENODEV; 2575 } 2576 2577 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2578 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2579 return -EINVAL; 2580 } 2581 2582 addr = nla_data(tb[NDA_LLADDR]); 2583 2584 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2585 if (err) 2586 return err; 2587 2588 err = -EOPNOTSUPP; 2589 2590 /* Support fdb on master device the net/bridge default case */ 2591 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2592 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2593 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2594 const struct net_device_ops *ops = br_dev->netdev_ops; 2595 2596 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2597 nlh->nlmsg_flags); 2598 if (err) 2599 goto out; 2600 else 2601 ndm->ndm_flags &= ~NTF_MASTER; 2602 } 2603 2604 /* Embedded bridge, macvlan, and any other device support */ 2605 if ((ndm->ndm_flags & NTF_SELF)) { 2606 if (dev->netdev_ops->ndo_fdb_add) 2607 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2608 vid, 2609 nlh->nlmsg_flags); 2610 else 2611 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 2612 nlh->nlmsg_flags); 2613 2614 if (!err) { 2615 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH); 2616 ndm->ndm_flags &= ~NTF_SELF; 2617 } 2618 } 2619 out: 2620 return err; 2621 } 2622 2623 /** 2624 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2625 */ 2626 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2627 struct nlattr *tb[], 2628 struct net_device *dev, 2629 const unsigned char *addr, u16 vid) 2630 { 2631 int err = -EINVAL; 2632 2633 /* If aging addresses are supported device will need to 2634 * implement its own handler for this. 2635 */ 2636 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2637 pr_info("%s: FDB only supports static addresses\n", dev->name); 2638 return err; 2639 } 2640 2641 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2642 err = dev_uc_del(dev, addr); 2643 else if (is_multicast_ether_addr(addr)) 2644 err = dev_mc_del(dev, addr); 2645 2646 return err; 2647 } 2648 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2649 2650 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2651 { 2652 struct net *net = sock_net(skb->sk); 2653 struct ndmsg *ndm; 2654 struct nlattr *tb[NDA_MAX+1]; 2655 struct net_device *dev; 2656 int err = -EINVAL; 2657 __u8 *addr; 2658 u16 vid; 2659 2660 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2661 return -EPERM; 2662 2663 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2664 if (err < 0) 2665 return err; 2666 2667 ndm = nlmsg_data(nlh); 2668 if (ndm->ndm_ifindex == 0) { 2669 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2670 return -EINVAL; 2671 } 2672 2673 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2674 if (dev == NULL) { 2675 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2676 return -ENODEV; 2677 } 2678 2679 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2680 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2681 return -EINVAL; 2682 } 2683 2684 addr = nla_data(tb[NDA_LLADDR]); 2685 2686 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2687 if (err) 2688 return err; 2689 2690 err = -EOPNOTSUPP; 2691 2692 /* Support fdb on master device the net/bridge default case */ 2693 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2694 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2695 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2696 const struct net_device_ops *ops = br_dev->netdev_ops; 2697 2698 if (ops->ndo_fdb_del) 2699 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 2700 2701 if (err) 2702 goto out; 2703 else 2704 ndm->ndm_flags &= ~NTF_MASTER; 2705 } 2706 2707 /* Embedded bridge, macvlan, and any other device support */ 2708 if (ndm->ndm_flags & NTF_SELF) { 2709 if (dev->netdev_ops->ndo_fdb_del) 2710 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 2711 vid); 2712 else 2713 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 2714 2715 if (!err) { 2716 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH); 2717 ndm->ndm_flags &= ~NTF_SELF; 2718 } 2719 } 2720 out: 2721 return err; 2722 } 2723 2724 static int nlmsg_populate_fdb(struct sk_buff *skb, 2725 struct netlink_callback *cb, 2726 struct net_device *dev, 2727 int *idx, 2728 struct netdev_hw_addr_list *list) 2729 { 2730 struct netdev_hw_addr *ha; 2731 int err; 2732 u32 portid, seq; 2733 2734 portid = NETLINK_CB(cb->skb).portid; 2735 seq = cb->nlh->nlmsg_seq; 2736 2737 list_for_each_entry(ha, &list->list, list) { 2738 if (*idx < cb->args[0]) 2739 goto skip; 2740 2741 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 2742 portid, seq, 2743 RTM_NEWNEIGH, NTF_SELF, 2744 NLM_F_MULTI); 2745 if (err < 0) 2746 return err; 2747 skip: 2748 *idx += 1; 2749 } 2750 return 0; 2751 } 2752 2753 /** 2754 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2755 * @nlh: netlink message header 2756 * @dev: netdevice 2757 * 2758 * Default netdevice operation to dump the existing unicast address list. 2759 * Returns number of addresses from list put in skb. 2760 */ 2761 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2762 struct netlink_callback *cb, 2763 struct net_device *dev, 2764 struct net_device *filter_dev, 2765 int idx) 2766 { 2767 int err; 2768 2769 netif_addr_lock_bh(dev); 2770 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2771 if (err) 2772 goto out; 2773 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2774 out: 2775 netif_addr_unlock_bh(dev); 2776 return idx; 2777 } 2778 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2779 2780 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2781 { 2782 struct net_device *dev; 2783 struct nlattr *tb[IFLA_MAX+1]; 2784 struct net_device *br_dev = NULL; 2785 const struct net_device_ops *ops = NULL; 2786 const struct net_device_ops *cops = NULL; 2787 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2788 struct net *net = sock_net(skb->sk); 2789 int brport_idx = 0; 2790 int br_idx = 0; 2791 int idx = 0; 2792 2793 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 2794 ifla_policy) == 0) { 2795 if (tb[IFLA_MASTER]) 2796 br_idx = nla_get_u32(tb[IFLA_MASTER]); 2797 } 2798 2799 brport_idx = ifm->ifi_index; 2800 2801 if (br_idx) { 2802 br_dev = __dev_get_by_index(net, br_idx); 2803 if (!br_dev) 2804 return -ENODEV; 2805 2806 ops = br_dev->netdev_ops; 2807 } 2808 2809 for_each_netdev(net, dev) { 2810 if (brport_idx && (dev->ifindex != brport_idx)) 2811 continue; 2812 2813 if (!br_idx) { /* user did not specify a specific bridge */ 2814 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2815 br_dev = netdev_master_upper_dev_get(dev); 2816 cops = br_dev->netdev_ops; 2817 } 2818 2819 } else { 2820 if (dev != br_dev && 2821 !(dev->priv_flags & IFF_BRIDGE_PORT)) 2822 continue; 2823 2824 if (br_dev != netdev_master_upper_dev_get(dev) && 2825 !(dev->priv_flags & IFF_EBRIDGE)) 2826 continue; 2827 2828 cops = ops; 2829 } 2830 2831 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2832 if (cops && cops->ndo_fdb_dump) 2833 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 2834 idx); 2835 } 2836 2837 if (dev->netdev_ops->ndo_fdb_dump) 2838 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL, 2839 idx); 2840 else 2841 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 2842 2843 cops = NULL; 2844 } 2845 2846 cb->args[0] = idx; 2847 return skb->len; 2848 } 2849 2850 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 2851 unsigned int attrnum, unsigned int flag) 2852 { 2853 if (mask & flag) 2854 return nla_put_u8(skb, attrnum, !!(flags & flag)); 2855 return 0; 2856 } 2857 2858 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2859 struct net_device *dev, u16 mode, 2860 u32 flags, u32 mask, int nlflags) 2861 { 2862 struct nlmsghdr *nlh; 2863 struct ifinfomsg *ifm; 2864 struct nlattr *br_afspec; 2865 struct nlattr *protinfo; 2866 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2867 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2868 2869 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 2870 if (nlh == NULL) 2871 return -EMSGSIZE; 2872 2873 ifm = nlmsg_data(nlh); 2874 ifm->ifi_family = AF_BRIDGE; 2875 ifm->__ifi_pad = 0; 2876 ifm->ifi_type = dev->type; 2877 ifm->ifi_index = dev->ifindex; 2878 ifm->ifi_flags = dev_get_flags(dev); 2879 ifm->ifi_change = 0; 2880 2881 2882 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2883 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2884 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2885 (br_dev && 2886 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2887 (dev->addr_len && 2888 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2889 (dev->ifindex != dev_get_iflink(dev) && 2890 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 2891 goto nla_put_failure; 2892 2893 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2894 if (!br_afspec) 2895 goto nla_put_failure; 2896 2897 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 2898 nla_nest_cancel(skb, br_afspec); 2899 goto nla_put_failure; 2900 } 2901 2902 if (mode != BRIDGE_MODE_UNDEF) { 2903 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2904 nla_nest_cancel(skb, br_afspec); 2905 goto nla_put_failure; 2906 } 2907 } 2908 nla_nest_end(skb, br_afspec); 2909 2910 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 2911 if (!protinfo) 2912 goto nla_put_failure; 2913 2914 if (brport_nla_put_flag(skb, flags, mask, 2915 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 2916 brport_nla_put_flag(skb, flags, mask, 2917 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 2918 brport_nla_put_flag(skb, flags, mask, 2919 IFLA_BRPORT_FAST_LEAVE, 2920 BR_MULTICAST_FAST_LEAVE) || 2921 brport_nla_put_flag(skb, flags, mask, 2922 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 2923 brport_nla_put_flag(skb, flags, mask, 2924 IFLA_BRPORT_LEARNING, BR_LEARNING) || 2925 brport_nla_put_flag(skb, flags, mask, 2926 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 2927 brport_nla_put_flag(skb, flags, mask, 2928 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 2929 brport_nla_put_flag(skb, flags, mask, 2930 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 2931 nla_nest_cancel(skb, protinfo); 2932 goto nla_put_failure; 2933 } 2934 2935 nla_nest_end(skb, protinfo); 2936 2937 nlmsg_end(skb, nlh); 2938 return 0; 2939 nla_put_failure: 2940 nlmsg_cancel(skb, nlh); 2941 return -EMSGSIZE; 2942 } 2943 EXPORT_SYMBOL(ndo_dflt_bridge_getlink); 2944 2945 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 2946 { 2947 struct net *net = sock_net(skb->sk); 2948 struct net_device *dev; 2949 int idx = 0; 2950 u32 portid = NETLINK_CB(cb->skb).portid; 2951 u32 seq = cb->nlh->nlmsg_seq; 2952 u32 filter_mask = 0; 2953 2954 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 2955 struct nlattr *extfilt; 2956 2957 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 2958 IFLA_EXT_MASK); 2959 if (extfilt) { 2960 if (nla_len(extfilt) < sizeof(filter_mask)) 2961 return -EINVAL; 2962 2963 filter_mask = nla_get_u32(extfilt); 2964 } 2965 } 2966 2967 rcu_read_lock(); 2968 for_each_netdev_rcu(net, dev) { 2969 const struct net_device_ops *ops = dev->netdev_ops; 2970 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2971 2972 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2973 if (idx >= cb->args[0] && 2974 br_dev->netdev_ops->ndo_bridge_getlink( 2975 skb, portid, seq, dev, filter_mask, 2976 NLM_F_MULTI) < 0) 2977 break; 2978 idx++; 2979 } 2980 2981 if (ops->ndo_bridge_getlink) { 2982 if (idx >= cb->args[0] && 2983 ops->ndo_bridge_getlink(skb, portid, seq, dev, 2984 filter_mask, 2985 NLM_F_MULTI) < 0) 2986 break; 2987 idx++; 2988 } 2989 } 2990 rcu_read_unlock(); 2991 cb->args[0] = idx; 2992 2993 return skb->len; 2994 } 2995 2996 static inline size_t bridge_nlmsg_size(void) 2997 { 2998 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 2999 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3000 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3001 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3002 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3003 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3004 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3005 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3006 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3007 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3008 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3009 } 3010 3011 static int rtnl_bridge_notify(struct net_device *dev) 3012 { 3013 struct net *net = dev_net(dev); 3014 struct sk_buff *skb; 3015 int err = -EOPNOTSUPP; 3016 3017 if (!dev->netdev_ops->ndo_bridge_getlink) 3018 return 0; 3019 3020 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3021 if (!skb) { 3022 err = -ENOMEM; 3023 goto errout; 3024 } 3025 3026 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3027 if (err < 0) 3028 goto errout; 3029 3030 if (!skb->len) 3031 goto errout; 3032 3033 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3034 return 0; 3035 errout: 3036 WARN_ON(err == -EMSGSIZE); 3037 kfree_skb(skb); 3038 if (err) 3039 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3040 return err; 3041 } 3042 3043 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3044 { 3045 struct net *net = sock_net(skb->sk); 3046 struct ifinfomsg *ifm; 3047 struct net_device *dev; 3048 struct nlattr *br_spec, *attr = NULL; 3049 int rem, err = -EOPNOTSUPP; 3050 u16 flags = 0; 3051 bool have_flags = false; 3052 3053 if (nlmsg_len(nlh) < sizeof(*ifm)) 3054 return -EINVAL; 3055 3056 ifm = nlmsg_data(nlh); 3057 if (ifm->ifi_family != AF_BRIDGE) 3058 return -EPFNOSUPPORT; 3059 3060 dev = __dev_get_by_index(net, ifm->ifi_index); 3061 if (!dev) { 3062 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3063 return -ENODEV; 3064 } 3065 3066 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3067 if (br_spec) { 3068 nla_for_each_nested(attr, br_spec, rem) { 3069 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3070 if (nla_len(attr) < sizeof(flags)) 3071 return -EINVAL; 3072 3073 have_flags = true; 3074 flags = nla_get_u16(attr); 3075 break; 3076 } 3077 } 3078 } 3079 3080 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3081 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3082 3083 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3084 err = -EOPNOTSUPP; 3085 goto out; 3086 } 3087 3088 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3089 if (err) 3090 goto out; 3091 3092 flags &= ~BRIDGE_FLAGS_MASTER; 3093 } 3094 3095 if ((flags & BRIDGE_FLAGS_SELF)) { 3096 if (!dev->netdev_ops->ndo_bridge_setlink) 3097 err = -EOPNOTSUPP; 3098 else 3099 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3100 flags); 3101 if (!err) { 3102 flags &= ~BRIDGE_FLAGS_SELF; 3103 3104 /* Generate event to notify upper layer of bridge 3105 * change 3106 */ 3107 err = rtnl_bridge_notify(dev); 3108 } 3109 } 3110 3111 if (have_flags) 3112 memcpy(nla_data(attr), &flags, sizeof(flags)); 3113 out: 3114 return err; 3115 } 3116 3117 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3118 { 3119 struct net *net = sock_net(skb->sk); 3120 struct ifinfomsg *ifm; 3121 struct net_device *dev; 3122 struct nlattr *br_spec, *attr = NULL; 3123 int rem, err = -EOPNOTSUPP; 3124 u16 flags = 0; 3125 bool have_flags = false; 3126 3127 if (nlmsg_len(nlh) < sizeof(*ifm)) 3128 return -EINVAL; 3129 3130 ifm = nlmsg_data(nlh); 3131 if (ifm->ifi_family != AF_BRIDGE) 3132 return -EPFNOSUPPORT; 3133 3134 dev = __dev_get_by_index(net, ifm->ifi_index); 3135 if (!dev) { 3136 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3137 return -ENODEV; 3138 } 3139 3140 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3141 if (br_spec) { 3142 nla_for_each_nested(attr, br_spec, rem) { 3143 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3144 if (nla_len(attr) < sizeof(flags)) 3145 return -EINVAL; 3146 3147 have_flags = true; 3148 flags = nla_get_u16(attr); 3149 break; 3150 } 3151 } 3152 } 3153 3154 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3155 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3156 3157 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3158 err = -EOPNOTSUPP; 3159 goto out; 3160 } 3161 3162 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3163 if (err) 3164 goto out; 3165 3166 flags &= ~BRIDGE_FLAGS_MASTER; 3167 } 3168 3169 if ((flags & BRIDGE_FLAGS_SELF)) { 3170 if (!dev->netdev_ops->ndo_bridge_dellink) 3171 err = -EOPNOTSUPP; 3172 else 3173 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3174 flags); 3175 3176 if (!err) { 3177 flags &= ~BRIDGE_FLAGS_SELF; 3178 3179 /* Generate event to notify upper layer of bridge 3180 * change 3181 */ 3182 err = rtnl_bridge_notify(dev); 3183 } 3184 } 3185 3186 if (have_flags) 3187 memcpy(nla_data(attr), &flags, sizeof(flags)); 3188 out: 3189 return err; 3190 } 3191 3192 /* Process one rtnetlink message. */ 3193 3194 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3195 { 3196 struct net *net = sock_net(skb->sk); 3197 rtnl_doit_func doit; 3198 int sz_idx, kind; 3199 int family; 3200 int type; 3201 int err; 3202 3203 type = nlh->nlmsg_type; 3204 if (type > RTM_MAX) 3205 return -EOPNOTSUPP; 3206 3207 type -= RTM_BASE; 3208 3209 /* All the messages must have at least 1 byte length */ 3210 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3211 return 0; 3212 3213 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3214 sz_idx = type>>2; 3215 kind = type&3; 3216 3217 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3218 return -EPERM; 3219 3220 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 3221 struct sock *rtnl; 3222 rtnl_dumpit_func dumpit; 3223 rtnl_calcit_func calcit; 3224 u16 min_dump_alloc = 0; 3225 3226 dumpit = rtnl_get_dumpit(family, type); 3227 if (dumpit == NULL) 3228 return -EOPNOTSUPP; 3229 calcit = rtnl_get_calcit(family, type); 3230 if (calcit) 3231 min_dump_alloc = calcit(skb, nlh); 3232 3233 __rtnl_unlock(); 3234 rtnl = net->rtnl; 3235 { 3236 struct netlink_dump_control c = { 3237 .dump = dumpit, 3238 .min_dump_alloc = min_dump_alloc, 3239 }; 3240 err = netlink_dump_start(rtnl, skb, nlh, &c); 3241 } 3242 rtnl_lock(); 3243 return err; 3244 } 3245 3246 doit = rtnl_get_doit(family, type); 3247 if (doit == NULL) 3248 return -EOPNOTSUPP; 3249 3250 return doit(skb, nlh); 3251 } 3252 3253 static void rtnetlink_rcv(struct sk_buff *skb) 3254 { 3255 rtnl_lock(); 3256 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 3257 rtnl_unlock(); 3258 } 3259 3260 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 3261 { 3262 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3263 3264 switch (event) { 3265 case NETDEV_UP: 3266 case NETDEV_DOWN: 3267 case NETDEV_PRE_UP: 3268 case NETDEV_POST_INIT: 3269 case NETDEV_REGISTER: 3270 case NETDEV_CHANGE: 3271 case NETDEV_PRE_TYPE_CHANGE: 3272 case NETDEV_GOING_DOWN: 3273 case NETDEV_UNREGISTER: 3274 case NETDEV_UNREGISTER_FINAL: 3275 case NETDEV_RELEASE: 3276 case NETDEV_JOIN: 3277 case NETDEV_BONDING_INFO: 3278 break; 3279 default: 3280 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3281 break; 3282 } 3283 return NOTIFY_DONE; 3284 } 3285 3286 static struct notifier_block rtnetlink_dev_notifier = { 3287 .notifier_call = rtnetlink_event, 3288 }; 3289 3290 3291 static int __net_init rtnetlink_net_init(struct net *net) 3292 { 3293 struct sock *sk; 3294 struct netlink_kernel_cfg cfg = { 3295 .groups = RTNLGRP_MAX, 3296 .input = rtnetlink_rcv, 3297 .cb_mutex = &rtnl_mutex, 3298 .flags = NL_CFG_F_NONROOT_RECV, 3299 }; 3300 3301 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3302 if (!sk) 3303 return -ENOMEM; 3304 net->rtnl = sk; 3305 return 0; 3306 } 3307 3308 static void __net_exit rtnetlink_net_exit(struct net *net) 3309 { 3310 netlink_kernel_release(net->rtnl); 3311 net->rtnl = NULL; 3312 } 3313 3314 static struct pernet_operations rtnetlink_net_ops = { 3315 .init = rtnetlink_net_init, 3316 .exit = rtnetlink_net_exit, 3317 }; 3318 3319 void __init rtnetlink_init(void) 3320 { 3321 if (register_pernet_subsys(&rtnetlink_net_ops)) 3322 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3323 3324 register_netdevice_notifier(&rtnetlink_dev_notifier); 3325 3326 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3327 rtnl_dump_ifinfo, rtnl_calcit); 3328 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3329 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3330 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3331 3332 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3333 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3334 3335 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3336 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3337 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3338 3339 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3340 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3341 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3342 } 3343 3344