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/bitops.h> 20 #include <linux/errno.h> 21 #include <linux/module.h> 22 #include <linux/types.h> 23 #include <linux/socket.h> 24 #include <linux/kernel.h> 25 #include <linux/timer.h> 26 #include <linux/string.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/fcntl.h> 30 #include <linux/mm.h> 31 #include <linux/slab.h> 32 #include <linux/interrupt.h> 33 #include <linux/capability.h> 34 #include <linux/skbuff.h> 35 #include <linux/init.h> 36 #include <linux/security.h> 37 #include <linux/mutex.h> 38 #include <linux/if_addr.h> 39 #include <linux/if_bridge.h> 40 #include <linux/if_vlan.h> 41 #include <linux/pci.h> 42 #include <linux/etherdevice.h> 43 #include <linux/bpf.h> 44 45 #include <linux/uaccess.h> 46 47 #include <linux/inet.h> 48 #include <linux/netdevice.h> 49 #include <net/switchdev.h> 50 #include <net/ip.h> 51 #include <net/protocol.h> 52 #include <net/arp.h> 53 #include <net/route.h> 54 #include <net/udp.h> 55 #include <net/tcp.h> 56 #include <net/sock.h> 57 #include <net/pkt_sched.h> 58 #include <net/fib_rules.h> 59 #include <net/rtnetlink.h> 60 #include <net/net_namespace.h> 61 62 struct rtnl_link { 63 rtnl_doit_func doit; 64 rtnl_dumpit_func dumpit; 65 unsigned int flags; 66 }; 67 68 static DEFINE_MUTEX(rtnl_mutex); 69 70 void rtnl_lock(void) 71 { 72 mutex_lock(&rtnl_mutex); 73 } 74 EXPORT_SYMBOL(rtnl_lock); 75 76 static struct sk_buff *defer_kfree_skb_list; 77 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail) 78 { 79 if (head && tail) { 80 tail->next = defer_kfree_skb_list; 81 defer_kfree_skb_list = head; 82 } 83 } 84 EXPORT_SYMBOL(rtnl_kfree_skbs); 85 86 void __rtnl_unlock(void) 87 { 88 struct sk_buff *head = defer_kfree_skb_list; 89 90 defer_kfree_skb_list = NULL; 91 92 mutex_unlock(&rtnl_mutex); 93 94 while (head) { 95 struct sk_buff *next = head->next; 96 97 kfree_skb(head); 98 cond_resched(); 99 head = next; 100 } 101 } 102 103 void rtnl_unlock(void) 104 { 105 /* This fellow will unlock it for us. */ 106 netdev_run_todo(); 107 } 108 EXPORT_SYMBOL(rtnl_unlock); 109 110 int rtnl_trylock(void) 111 { 112 return mutex_trylock(&rtnl_mutex); 113 } 114 EXPORT_SYMBOL(rtnl_trylock); 115 116 int rtnl_is_locked(void) 117 { 118 return mutex_is_locked(&rtnl_mutex); 119 } 120 EXPORT_SYMBOL(rtnl_is_locked); 121 122 #ifdef CONFIG_PROVE_LOCKING 123 bool lockdep_rtnl_is_held(void) 124 { 125 return lockdep_is_held(&rtnl_mutex); 126 } 127 EXPORT_SYMBOL(lockdep_rtnl_is_held); 128 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 129 130 static struct rtnl_link __rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 131 static refcount_t rtnl_msg_handlers_ref[RTNL_FAMILY_MAX + 1]; 132 133 static inline int rtm_msgindex(int msgtype) 134 { 135 int msgindex = msgtype - RTM_BASE; 136 137 /* 138 * msgindex < 0 implies someone tried to register a netlink 139 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 140 * the message type has not been added to linux/rtnetlink.h 141 */ 142 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 143 144 return msgindex; 145 } 146 147 /** 148 * __rtnl_register - Register a rtnetlink message type 149 * @protocol: Protocol family or PF_UNSPEC 150 * @msgtype: rtnetlink message type 151 * @doit: Function pointer called for each request message 152 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 153 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions 154 * 155 * Registers the specified function pointers (at least one of them has 156 * to be non-NULL) to be called whenever a request message for the 157 * specified protocol family and message type is received. 158 * 159 * The special protocol family PF_UNSPEC may be used to define fallback 160 * function pointers for the case when no entry for the specific protocol 161 * family exists. 162 * 163 * Returns 0 on success or a negative error code. 164 */ 165 int __rtnl_register(int protocol, int msgtype, 166 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 167 unsigned int flags) 168 { 169 struct rtnl_link *tab; 170 int msgindex; 171 172 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 173 msgindex = rtm_msgindex(msgtype); 174 175 tab = rcu_dereference_raw(rtnl_msg_handlers[protocol]); 176 if (tab == NULL) { 177 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 178 if (tab == NULL) 179 return -ENOBUFS; 180 181 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab); 182 } 183 184 if (doit) 185 tab[msgindex].doit = doit; 186 if (dumpit) 187 tab[msgindex].dumpit = dumpit; 188 tab[msgindex].flags |= flags; 189 190 return 0; 191 } 192 EXPORT_SYMBOL_GPL(__rtnl_register); 193 194 /** 195 * rtnl_register - Register a rtnetlink message type 196 * 197 * Identical to __rtnl_register() but panics on failure. This is useful 198 * as failure of this function is very unlikely, it can only happen due 199 * to lack of memory when allocating the chain to store all message 200 * handlers for a protocol. Meant for use in init functions where lack 201 * of memory implies no sense in continuing. 202 */ 203 void rtnl_register(int protocol, int msgtype, 204 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 205 unsigned int flags) 206 { 207 if (__rtnl_register(protocol, msgtype, doit, dumpit, flags) < 0) 208 panic("Unable to register rtnetlink message handler, " 209 "protocol = %d, message type = %d\n", 210 protocol, msgtype); 211 } 212 EXPORT_SYMBOL_GPL(rtnl_register); 213 214 /** 215 * rtnl_unregister - Unregister a rtnetlink message type 216 * @protocol: Protocol family or PF_UNSPEC 217 * @msgtype: rtnetlink message type 218 * 219 * Returns 0 on success or a negative error code. 220 */ 221 int rtnl_unregister(int protocol, int msgtype) 222 { 223 struct rtnl_link *handlers; 224 int msgindex; 225 226 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 227 msgindex = rtm_msgindex(msgtype); 228 229 rtnl_lock(); 230 handlers = rtnl_dereference(rtnl_msg_handlers[protocol]); 231 if (!handlers) { 232 rtnl_unlock(); 233 return -ENOENT; 234 } 235 236 handlers[msgindex].doit = NULL; 237 handlers[msgindex].dumpit = NULL; 238 handlers[msgindex].flags = 0; 239 rtnl_unlock(); 240 241 return 0; 242 } 243 EXPORT_SYMBOL_GPL(rtnl_unregister); 244 245 /** 246 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 247 * @protocol : Protocol family or PF_UNSPEC 248 * 249 * Identical to calling rtnl_unregster() for all registered message types 250 * of a certain protocol family. 251 */ 252 void rtnl_unregister_all(int protocol) 253 { 254 struct rtnl_link *handlers; 255 256 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 257 258 rtnl_lock(); 259 handlers = rtnl_dereference(rtnl_msg_handlers[protocol]); 260 RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL); 261 rtnl_unlock(); 262 263 synchronize_net(); 264 265 while (refcount_read(&rtnl_msg_handlers_ref[protocol]) > 1) 266 schedule(); 267 kfree(handlers); 268 } 269 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 270 271 static LIST_HEAD(link_ops); 272 273 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 274 { 275 const struct rtnl_link_ops *ops; 276 277 list_for_each_entry(ops, &link_ops, list) { 278 if (!strcmp(ops->kind, kind)) 279 return ops; 280 } 281 return NULL; 282 } 283 284 /** 285 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 286 * @ops: struct rtnl_link_ops * to register 287 * 288 * The caller must hold the rtnl_mutex. This function should be used 289 * by drivers that create devices during module initialization. It 290 * must be called before registering the devices. 291 * 292 * Returns 0 on success or a negative error code. 293 */ 294 int __rtnl_link_register(struct rtnl_link_ops *ops) 295 { 296 if (rtnl_link_ops_get(ops->kind)) 297 return -EEXIST; 298 299 /* The check for setup is here because if ops 300 * does not have that filled up, it is not possible 301 * to use the ops for creating device. So do not 302 * fill up dellink as well. That disables rtnl_dellink. 303 */ 304 if (ops->setup && !ops->dellink) 305 ops->dellink = unregister_netdevice_queue; 306 307 list_add_tail(&ops->list, &link_ops); 308 return 0; 309 } 310 EXPORT_SYMBOL_GPL(__rtnl_link_register); 311 312 /** 313 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 314 * @ops: struct rtnl_link_ops * to register 315 * 316 * Returns 0 on success or a negative error code. 317 */ 318 int rtnl_link_register(struct rtnl_link_ops *ops) 319 { 320 int err; 321 322 rtnl_lock(); 323 err = __rtnl_link_register(ops); 324 rtnl_unlock(); 325 return err; 326 } 327 EXPORT_SYMBOL_GPL(rtnl_link_register); 328 329 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 330 { 331 struct net_device *dev; 332 LIST_HEAD(list_kill); 333 334 for_each_netdev(net, dev) { 335 if (dev->rtnl_link_ops == ops) 336 ops->dellink(dev, &list_kill); 337 } 338 unregister_netdevice_many(&list_kill); 339 } 340 341 /** 342 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 343 * @ops: struct rtnl_link_ops * to unregister 344 * 345 * The caller must hold the rtnl_mutex. 346 */ 347 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 348 { 349 struct net *net; 350 351 for_each_net(net) { 352 __rtnl_kill_links(net, ops); 353 } 354 list_del(&ops->list); 355 } 356 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 357 358 /* Return with the rtnl_lock held when there are no network 359 * devices unregistering in any network namespace. 360 */ 361 static void rtnl_lock_unregistering_all(void) 362 { 363 struct net *net; 364 bool unregistering; 365 DEFINE_WAIT_FUNC(wait, woken_wake_function); 366 367 add_wait_queue(&netdev_unregistering_wq, &wait); 368 for (;;) { 369 unregistering = false; 370 rtnl_lock(); 371 for_each_net(net) { 372 if (net->dev_unreg_count > 0) { 373 unregistering = true; 374 break; 375 } 376 } 377 if (!unregistering) 378 break; 379 __rtnl_unlock(); 380 381 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 382 } 383 remove_wait_queue(&netdev_unregistering_wq, &wait); 384 } 385 386 /** 387 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 388 * @ops: struct rtnl_link_ops * to unregister 389 */ 390 void rtnl_link_unregister(struct rtnl_link_ops *ops) 391 { 392 /* Close the race with cleanup_net() */ 393 mutex_lock(&net_mutex); 394 rtnl_lock_unregistering_all(); 395 __rtnl_link_unregister(ops); 396 rtnl_unlock(); 397 mutex_unlock(&net_mutex); 398 } 399 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 400 401 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 402 { 403 struct net_device *master_dev; 404 const struct rtnl_link_ops *ops; 405 size_t size = 0; 406 407 rcu_read_lock(); 408 409 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev); 410 if (!master_dev) 411 goto out; 412 413 ops = master_dev->rtnl_link_ops; 414 if (!ops || !ops->get_slave_size) 415 goto out; 416 /* IFLA_INFO_SLAVE_DATA + nested data */ 417 size = nla_total_size(sizeof(struct nlattr)) + 418 ops->get_slave_size(master_dev, dev); 419 420 out: 421 rcu_read_unlock(); 422 return size; 423 } 424 425 static size_t rtnl_link_get_size(const struct net_device *dev) 426 { 427 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 428 size_t size; 429 430 if (!ops) 431 return 0; 432 433 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 434 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 435 436 if (ops->get_size) 437 /* IFLA_INFO_DATA + nested data */ 438 size += nla_total_size(sizeof(struct nlattr)) + 439 ops->get_size(dev); 440 441 if (ops->get_xstats_size) 442 /* IFLA_INFO_XSTATS */ 443 size += nla_total_size(ops->get_xstats_size(dev)); 444 445 size += rtnl_link_get_slave_info_data_size(dev); 446 447 return size; 448 } 449 450 static LIST_HEAD(rtnl_af_ops); 451 452 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 453 { 454 const struct rtnl_af_ops *ops; 455 456 list_for_each_entry_rcu(ops, &rtnl_af_ops, list) { 457 if (ops->family == family) 458 return ops; 459 } 460 461 return NULL; 462 } 463 464 /** 465 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 466 * @ops: struct rtnl_af_ops * to register 467 * 468 * Returns 0 on success or a negative error code. 469 */ 470 void rtnl_af_register(struct rtnl_af_ops *ops) 471 { 472 rtnl_lock(); 473 list_add_tail_rcu(&ops->list, &rtnl_af_ops); 474 rtnl_unlock(); 475 } 476 EXPORT_SYMBOL_GPL(rtnl_af_register); 477 478 /** 479 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 480 * @ops: struct rtnl_af_ops * to unregister 481 */ 482 void rtnl_af_unregister(struct rtnl_af_ops *ops) 483 { 484 rtnl_lock(); 485 list_del_rcu(&ops->list); 486 rtnl_unlock(); 487 488 synchronize_rcu(); 489 } 490 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 491 492 static size_t rtnl_link_get_af_size(const struct net_device *dev, 493 u32 ext_filter_mask) 494 { 495 struct rtnl_af_ops *af_ops; 496 size_t size; 497 498 /* IFLA_AF_SPEC */ 499 size = nla_total_size(sizeof(struct nlattr)); 500 501 rcu_read_lock(); 502 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 503 if (af_ops->get_link_af_size) { 504 /* AF_* + nested data */ 505 size += nla_total_size(sizeof(struct nlattr)) + 506 af_ops->get_link_af_size(dev, ext_filter_mask); 507 } 508 } 509 rcu_read_unlock(); 510 511 return size; 512 } 513 514 static bool rtnl_have_link_slave_info(const struct net_device *dev) 515 { 516 struct net_device *master_dev; 517 bool ret = false; 518 519 rcu_read_lock(); 520 521 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev); 522 if (master_dev && master_dev->rtnl_link_ops) 523 ret = true; 524 rcu_read_unlock(); 525 return ret; 526 } 527 528 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 529 const struct net_device *dev) 530 { 531 struct net_device *master_dev; 532 const struct rtnl_link_ops *ops; 533 struct nlattr *slave_data; 534 int err; 535 536 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 537 if (!master_dev) 538 return 0; 539 ops = master_dev->rtnl_link_ops; 540 if (!ops) 541 return 0; 542 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 543 return -EMSGSIZE; 544 if (ops->fill_slave_info) { 545 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA); 546 if (!slave_data) 547 return -EMSGSIZE; 548 err = ops->fill_slave_info(skb, master_dev, dev); 549 if (err < 0) 550 goto err_cancel_slave_data; 551 nla_nest_end(skb, slave_data); 552 } 553 return 0; 554 555 err_cancel_slave_data: 556 nla_nest_cancel(skb, slave_data); 557 return err; 558 } 559 560 static int rtnl_link_info_fill(struct sk_buff *skb, 561 const struct net_device *dev) 562 { 563 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 564 struct nlattr *data; 565 int err; 566 567 if (!ops) 568 return 0; 569 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 570 return -EMSGSIZE; 571 if (ops->fill_xstats) { 572 err = ops->fill_xstats(skb, dev); 573 if (err < 0) 574 return err; 575 } 576 if (ops->fill_info) { 577 data = nla_nest_start(skb, IFLA_INFO_DATA); 578 if (data == NULL) 579 return -EMSGSIZE; 580 err = ops->fill_info(skb, dev); 581 if (err < 0) 582 goto err_cancel_data; 583 nla_nest_end(skb, data); 584 } 585 return 0; 586 587 err_cancel_data: 588 nla_nest_cancel(skb, data); 589 return err; 590 } 591 592 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 593 { 594 struct nlattr *linkinfo; 595 int err = -EMSGSIZE; 596 597 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 598 if (linkinfo == NULL) 599 goto out; 600 601 err = rtnl_link_info_fill(skb, dev); 602 if (err < 0) 603 goto err_cancel_link; 604 605 err = rtnl_link_slave_info_fill(skb, dev); 606 if (err < 0) 607 goto err_cancel_link; 608 609 nla_nest_end(skb, linkinfo); 610 return 0; 611 612 err_cancel_link: 613 nla_nest_cancel(skb, linkinfo); 614 out: 615 return err; 616 } 617 618 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 619 { 620 struct sock *rtnl = net->rtnl; 621 int err = 0; 622 623 NETLINK_CB(skb).dst_group = group; 624 if (echo) 625 refcount_inc(&skb->users); 626 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 627 if (echo) 628 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 629 return err; 630 } 631 632 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 633 { 634 struct sock *rtnl = net->rtnl; 635 636 return nlmsg_unicast(rtnl, skb, pid); 637 } 638 EXPORT_SYMBOL(rtnl_unicast); 639 640 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 641 struct nlmsghdr *nlh, gfp_t flags) 642 { 643 struct sock *rtnl = net->rtnl; 644 int report = 0; 645 646 if (nlh) 647 report = nlmsg_report(nlh); 648 649 nlmsg_notify(rtnl, skb, pid, group, report, flags); 650 } 651 EXPORT_SYMBOL(rtnl_notify); 652 653 void rtnl_set_sk_err(struct net *net, u32 group, int error) 654 { 655 struct sock *rtnl = net->rtnl; 656 657 netlink_set_err(rtnl, 0, group, error); 658 } 659 EXPORT_SYMBOL(rtnl_set_sk_err); 660 661 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 662 { 663 struct nlattr *mx; 664 int i, valid = 0; 665 666 mx = nla_nest_start(skb, RTA_METRICS); 667 if (mx == NULL) 668 return -ENOBUFS; 669 670 for (i = 0; i < RTAX_MAX; i++) { 671 if (metrics[i]) { 672 if (i == RTAX_CC_ALGO - 1) { 673 char tmp[TCP_CA_NAME_MAX], *name; 674 675 name = tcp_ca_get_name_by_key(metrics[i], tmp); 676 if (!name) 677 continue; 678 if (nla_put_string(skb, i + 1, name)) 679 goto nla_put_failure; 680 } else if (i == RTAX_FEATURES - 1) { 681 u32 user_features = metrics[i] & RTAX_FEATURE_MASK; 682 683 if (!user_features) 684 continue; 685 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); 686 if (nla_put_u32(skb, i + 1, user_features)) 687 goto nla_put_failure; 688 } else { 689 if (nla_put_u32(skb, i + 1, metrics[i])) 690 goto nla_put_failure; 691 } 692 valid++; 693 } 694 } 695 696 if (!valid) { 697 nla_nest_cancel(skb, mx); 698 return 0; 699 } 700 701 return nla_nest_end(skb, mx); 702 703 nla_put_failure: 704 nla_nest_cancel(skb, mx); 705 return -EMSGSIZE; 706 } 707 EXPORT_SYMBOL(rtnetlink_put_metrics); 708 709 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 710 long expires, u32 error) 711 { 712 struct rta_cacheinfo ci = { 713 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 714 .rta_used = dst->__use, 715 .rta_clntref = atomic_read(&(dst->__refcnt)), 716 .rta_error = error, 717 .rta_id = id, 718 }; 719 720 if (expires) { 721 unsigned long clock; 722 723 clock = jiffies_to_clock_t(abs(expires)); 724 clock = min_t(unsigned long, clock, INT_MAX); 725 ci.rta_expires = (expires > 0) ? clock : -clock; 726 } 727 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 728 } 729 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 730 731 static void set_operstate(struct net_device *dev, unsigned char transition) 732 { 733 unsigned char operstate = dev->operstate; 734 735 switch (transition) { 736 case IF_OPER_UP: 737 if ((operstate == IF_OPER_DORMANT || 738 operstate == IF_OPER_UNKNOWN) && 739 !netif_dormant(dev)) 740 operstate = IF_OPER_UP; 741 break; 742 743 case IF_OPER_DORMANT: 744 if (operstate == IF_OPER_UP || 745 operstate == IF_OPER_UNKNOWN) 746 operstate = IF_OPER_DORMANT; 747 break; 748 } 749 750 if (dev->operstate != operstate) { 751 write_lock_bh(&dev_base_lock); 752 dev->operstate = operstate; 753 write_unlock_bh(&dev_base_lock); 754 netdev_state_change(dev); 755 } 756 } 757 758 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 759 { 760 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 761 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 762 } 763 764 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 765 const struct ifinfomsg *ifm) 766 { 767 unsigned int flags = ifm->ifi_flags; 768 769 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 770 if (ifm->ifi_change) 771 flags = (flags & ifm->ifi_change) | 772 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 773 774 return flags; 775 } 776 777 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 778 const struct rtnl_link_stats64 *b) 779 { 780 a->rx_packets = b->rx_packets; 781 a->tx_packets = b->tx_packets; 782 a->rx_bytes = b->rx_bytes; 783 a->tx_bytes = b->tx_bytes; 784 a->rx_errors = b->rx_errors; 785 a->tx_errors = b->tx_errors; 786 a->rx_dropped = b->rx_dropped; 787 a->tx_dropped = b->tx_dropped; 788 789 a->multicast = b->multicast; 790 a->collisions = b->collisions; 791 792 a->rx_length_errors = b->rx_length_errors; 793 a->rx_over_errors = b->rx_over_errors; 794 a->rx_crc_errors = b->rx_crc_errors; 795 a->rx_frame_errors = b->rx_frame_errors; 796 a->rx_fifo_errors = b->rx_fifo_errors; 797 a->rx_missed_errors = b->rx_missed_errors; 798 799 a->tx_aborted_errors = b->tx_aborted_errors; 800 a->tx_carrier_errors = b->tx_carrier_errors; 801 a->tx_fifo_errors = b->tx_fifo_errors; 802 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 803 a->tx_window_errors = b->tx_window_errors; 804 805 a->rx_compressed = b->rx_compressed; 806 a->tx_compressed = b->tx_compressed; 807 808 a->rx_nohandler = b->rx_nohandler; 809 } 810 811 /* All VF info */ 812 static inline int rtnl_vfinfo_size(const struct net_device *dev, 813 u32 ext_filter_mask) 814 { 815 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) { 816 int num_vfs = dev_num_vf(dev->dev.parent); 817 size_t size = nla_total_size(0); 818 size += num_vfs * 819 (nla_total_size(0) + 820 nla_total_size(sizeof(struct ifla_vf_mac)) + 821 nla_total_size(sizeof(struct ifla_vf_vlan)) + 822 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */ 823 nla_total_size(MAX_VLAN_LIST_LEN * 824 sizeof(struct ifla_vf_vlan_info)) + 825 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 826 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 827 nla_total_size(sizeof(struct ifla_vf_rate)) + 828 nla_total_size(sizeof(struct ifla_vf_link_state)) + 829 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 830 nla_total_size(0) + /* nest IFLA_VF_STATS */ 831 /* IFLA_VF_STATS_RX_PACKETS */ 832 nla_total_size_64bit(sizeof(__u64)) + 833 /* IFLA_VF_STATS_TX_PACKETS */ 834 nla_total_size_64bit(sizeof(__u64)) + 835 /* IFLA_VF_STATS_RX_BYTES */ 836 nla_total_size_64bit(sizeof(__u64)) + 837 /* IFLA_VF_STATS_TX_BYTES */ 838 nla_total_size_64bit(sizeof(__u64)) + 839 /* IFLA_VF_STATS_BROADCAST */ 840 nla_total_size_64bit(sizeof(__u64)) + 841 /* IFLA_VF_STATS_MULTICAST */ 842 nla_total_size_64bit(sizeof(__u64)) + 843 nla_total_size(sizeof(struct ifla_vf_trust))); 844 return size; 845 } else 846 return 0; 847 } 848 849 static size_t rtnl_port_size(const struct net_device *dev, 850 u32 ext_filter_mask) 851 { 852 size_t port_size = nla_total_size(4) /* PORT_VF */ 853 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 854 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 855 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 856 + nla_total_size(1) /* PROT_VDP_REQUEST */ 857 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 858 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 859 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 860 + port_size; 861 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 862 + port_size; 863 864 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 865 !(ext_filter_mask & RTEXT_FILTER_VF)) 866 return 0; 867 if (dev_num_vf(dev->dev.parent)) 868 return port_self_size + vf_ports_size + 869 vf_port_size * dev_num_vf(dev->dev.parent); 870 else 871 return port_self_size; 872 } 873 874 static size_t rtnl_xdp_size(void) 875 { 876 size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */ 877 nla_total_size(1) + /* XDP_ATTACHED */ 878 nla_total_size(4); /* XDP_PROG_ID */ 879 880 return xdp_size; 881 } 882 883 static noinline size_t if_nlmsg_size(const struct net_device *dev, 884 u32 ext_filter_mask) 885 { 886 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 887 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 888 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 889 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 890 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap)) 891 + nla_total_size(sizeof(struct rtnl_link_stats)) 892 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64)) 893 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 894 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 895 + nla_total_size(4) /* IFLA_TXQLEN */ 896 + nla_total_size(4) /* IFLA_WEIGHT */ 897 + nla_total_size(4) /* IFLA_MTU */ 898 + nla_total_size(4) /* IFLA_LINK */ 899 + nla_total_size(4) /* IFLA_MASTER */ 900 + nla_total_size(1) /* IFLA_CARRIER */ 901 + nla_total_size(4) /* IFLA_PROMISCUITY */ 902 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 903 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 904 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */ 905 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */ 906 + nla_total_size(1) /* IFLA_OPERSTATE */ 907 + nla_total_size(1) /* IFLA_LINKMODE */ 908 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 909 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 910 + nla_total_size(4) /* IFLA_GROUP */ 911 + nla_total_size(ext_filter_mask 912 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 913 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 914 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 915 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 916 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 917 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 918 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 919 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */ 920 + rtnl_xdp_size() /* IFLA_XDP */ 921 + nla_total_size(4) /* IFLA_EVENT */ 922 + nla_total_size(4) /* IFLA_NEW_NETNSID */ 923 + nla_total_size(1) /* IFLA_PROTO_DOWN */ 924 + nla_total_size(4) /* IFLA_IF_NETNSID */ 925 + 0; 926 } 927 928 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 929 { 930 struct nlattr *vf_ports; 931 struct nlattr *vf_port; 932 int vf; 933 int err; 934 935 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 936 if (!vf_ports) 937 return -EMSGSIZE; 938 939 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 940 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 941 if (!vf_port) 942 goto nla_put_failure; 943 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 944 goto nla_put_failure; 945 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 946 if (err == -EMSGSIZE) 947 goto nla_put_failure; 948 if (err) { 949 nla_nest_cancel(skb, vf_port); 950 continue; 951 } 952 nla_nest_end(skb, vf_port); 953 } 954 955 nla_nest_end(skb, vf_ports); 956 957 return 0; 958 959 nla_put_failure: 960 nla_nest_cancel(skb, vf_ports); 961 return -EMSGSIZE; 962 } 963 964 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 965 { 966 struct nlattr *port_self; 967 int err; 968 969 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 970 if (!port_self) 971 return -EMSGSIZE; 972 973 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 974 if (err) { 975 nla_nest_cancel(skb, port_self); 976 return (err == -EMSGSIZE) ? err : 0; 977 } 978 979 nla_nest_end(skb, port_self); 980 981 return 0; 982 } 983 984 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 985 u32 ext_filter_mask) 986 { 987 int err; 988 989 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 990 !(ext_filter_mask & RTEXT_FILTER_VF)) 991 return 0; 992 993 err = rtnl_port_self_fill(skb, dev); 994 if (err) 995 return err; 996 997 if (dev_num_vf(dev->dev.parent)) { 998 err = rtnl_vf_ports_fill(skb, dev); 999 if (err) 1000 return err; 1001 } 1002 1003 return 0; 1004 } 1005 1006 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 1007 { 1008 int err; 1009 struct netdev_phys_item_id ppid; 1010 1011 err = dev_get_phys_port_id(dev, &ppid); 1012 if (err) { 1013 if (err == -EOPNOTSUPP) 1014 return 0; 1015 return err; 1016 } 1017 1018 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1019 return -EMSGSIZE; 1020 1021 return 0; 1022 } 1023 1024 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1025 { 1026 char name[IFNAMSIZ]; 1027 int err; 1028 1029 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1030 if (err) { 1031 if (err == -EOPNOTSUPP) 1032 return 0; 1033 return err; 1034 } 1035 1036 if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name)) 1037 return -EMSGSIZE; 1038 1039 return 0; 1040 } 1041 1042 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1043 { 1044 int err; 1045 struct switchdev_attr attr = { 1046 .orig_dev = dev, 1047 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 1048 .flags = SWITCHDEV_F_NO_RECURSE, 1049 }; 1050 1051 err = switchdev_port_attr_get(dev, &attr); 1052 if (err) { 1053 if (err == -EOPNOTSUPP) 1054 return 0; 1055 return err; 1056 } 1057 1058 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1059 attr.u.ppid.id)) 1060 return -EMSGSIZE; 1061 1062 return 0; 1063 } 1064 1065 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1066 struct net_device *dev) 1067 { 1068 struct rtnl_link_stats64 *sp; 1069 struct nlattr *attr; 1070 1071 attr = nla_reserve_64bit(skb, IFLA_STATS64, 1072 sizeof(struct rtnl_link_stats64), IFLA_PAD); 1073 if (!attr) 1074 return -EMSGSIZE; 1075 1076 sp = nla_data(attr); 1077 dev_get_stats(dev, sp); 1078 1079 attr = nla_reserve(skb, IFLA_STATS, 1080 sizeof(struct rtnl_link_stats)); 1081 if (!attr) 1082 return -EMSGSIZE; 1083 1084 copy_rtnl_link_stats(nla_data(attr), sp); 1085 1086 return 0; 1087 } 1088 1089 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1090 struct net_device *dev, 1091 int vfs_num, 1092 struct nlattr *vfinfo) 1093 { 1094 struct ifla_vf_rss_query_en vf_rss_query_en; 1095 struct nlattr *vf, *vfstats, *vfvlanlist; 1096 struct ifla_vf_link_state vf_linkstate; 1097 struct ifla_vf_vlan_info vf_vlan_info; 1098 struct ifla_vf_spoofchk vf_spoofchk; 1099 struct ifla_vf_tx_rate vf_tx_rate; 1100 struct ifla_vf_stats vf_stats; 1101 struct ifla_vf_trust vf_trust; 1102 struct ifla_vf_vlan vf_vlan; 1103 struct ifla_vf_rate vf_rate; 1104 struct ifla_vf_mac vf_mac; 1105 struct ifla_vf_info ivi; 1106 1107 memset(&ivi, 0, sizeof(ivi)); 1108 1109 /* Not all SR-IOV capable drivers support the 1110 * spoofcheck and "RSS query enable" query. Preset to 1111 * -1 so the user space tool can detect that the driver 1112 * didn't report anything. 1113 */ 1114 ivi.spoofchk = -1; 1115 ivi.rss_query_en = -1; 1116 ivi.trusted = -1; 1117 /* The default value for VF link state is "auto" 1118 * IFLA_VF_LINK_STATE_AUTO which equals zero 1119 */ 1120 ivi.linkstate = 0; 1121 /* VLAN Protocol by default is 802.1Q */ 1122 ivi.vlan_proto = htons(ETH_P_8021Q); 1123 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1124 return 0; 1125 1126 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info)); 1127 1128 vf_mac.vf = 1129 vf_vlan.vf = 1130 vf_vlan_info.vf = 1131 vf_rate.vf = 1132 vf_tx_rate.vf = 1133 vf_spoofchk.vf = 1134 vf_linkstate.vf = 1135 vf_rss_query_en.vf = 1136 vf_trust.vf = ivi.vf; 1137 1138 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1139 vf_vlan.vlan = ivi.vlan; 1140 vf_vlan.qos = ivi.qos; 1141 vf_vlan_info.vlan = ivi.vlan; 1142 vf_vlan_info.qos = ivi.qos; 1143 vf_vlan_info.vlan_proto = ivi.vlan_proto; 1144 vf_tx_rate.rate = ivi.max_tx_rate; 1145 vf_rate.min_tx_rate = ivi.min_tx_rate; 1146 vf_rate.max_tx_rate = ivi.max_tx_rate; 1147 vf_spoofchk.setting = ivi.spoofchk; 1148 vf_linkstate.link_state = ivi.linkstate; 1149 vf_rss_query_en.setting = ivi.rss_query_en; 1150 vf_trust.setting = ivi.trusted; 1151 vf = nla_nest_start(skb, IFLA_VF_INFO); 1152 if (!vf) 1153 goto nla_put_vfinfo_failure; 1154 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1155 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1156 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1157 &vf_rate) || 1158 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1159 &vf_tx_rate) || 1160 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1161 &vf_spoofchk) || 1162 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1163 &vf_linkstate) || 1164 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1165 sizeof(vf_rss_query_en), 1166 &vf_rss_query_en) || 1167 nla_put(skb, IFLA_VF_TRUST, 1168 sizeof(vf_trust), &vf_trust)) 1169 goto nla_put_vf_failure; 1170 vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST); 1171 if (!vfvlanlist) 1172 goto nla_put_vf_failure; 1173 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info), 1174 &vf_vlan_info)) { 1175 nla_nest_cancel(skb, vfvlanlist); 1176 goto nla_put_vf_failure; 1177 } 1178 nla_nest_end(skb, vfvlanlist); 1179 memset(&vf_stats, 0, sizeof(vf_stats)); 1180 if (dev->netdev_ops->ndo_get_vf_stats) 1181 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1182 &vf_stats); 1183 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1184 if (!vfstats) 1185 goto nla_put_vf_failure; 1186 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS, 1187 vf_stats.rx_packets, IFLA_VF_STATS_PAD) || 1188 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS, 1189 vf_stats.tx_packets, IFLA_VF_STATS_PAD) || 1190 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES, 1191 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) || 1192 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES, 1193 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) || 1194 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST, 1195 vf_stats.broadcast, IFLA_VF_STATS_PAD) || 1196 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST, 1197 vf_stats.multicast, IFLA_VF_STATS_PAD)) { 1198 nla_nest_cancel(skb, vfstats); 1199 goto nla_put_vf_failure; 1200 } 1201 nla_nest_end(skb, vfstats); 1202 nla_nest_end(skb, vf); 1203 return 0; 1204 1205 nla_put_vf_failure: 1206 nla_nest_cancel(skb, vf); 1207 nla_put_vfinfo_failure: 1208 nla_nest_cancel(skb, vfinfo); 1209 return -EMSGSIZE; 1210 } 1211 1212 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb, 1213 struct net_device *dev, 1214 u32 ext_filter_mask) 1215 { 1216 struct nlattr *vfinfo; 1217 int i, num_vfs; 1218 1219 if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0)) 1220 return 0; 1221 1222 num_vfs = dev_num_vf(dev->dev.parent); 1223 if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs)) 1224 return -EMSGSIZE; 1225 1226 if (!dev->netdev_ops->ndo_get_vf_config) 1227 return 0; 1228 1229 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1230 if (!vfinfo) 1231 return -EMSGSIZE; 1232 1233 for (i = 0; i < num_vfs; i++) { 1234 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1235 return -EMSGSIZE; 1236 } 1237 1238 nla_nest_end(skb, vfinfo); 1239 return 0; 1240 } 1241 1242 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1243 { 1244 struct rtnl_link_ifmap map; 1245 1246 memset(&map, 0, sizeof(map)); 1247 map.mem_start = dev->mem_start; 1248 map.mem_end = dev->mem_end; 1249 map.base_addr = dev->base_addr; 1250 map.irq = dev->irq; 1251 map.dma = dev->dma; 1252 map.port = dev->if_port; 1253 1254 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD)) 1255 return -EMSGSIZE; 1256 1257 return 0; 1258 } 1259 1260 static u8 rtnl_xdp_attached_mode(struct net_device *dev, u32 *prog_id) 1261 { 1262 const struct net_device_ops *ops = dev->netdev_ops; 1263 const struct bpf_prog *generic_xdp_prog; 1264 1265 ASSERT_RTNL(); 1266 1267 *prog_id = 0; 1268 generic_xdp_prog = rtnl_dereference(dev->xdp_prog); 1269 if (generic_xdp_prog) { 1270 *prog_id = generic_xdp_prog->aux->id; 1271 return XDP_ATTACHED_SKB; 1272 } 1273 if (!ops->ndo_bpf) 1274 return XDP_ATTACHED_NONE; 1275 1276 return __dev_xdp_attached(dev, ops->ndo_bpf, prog_id); 1277 } 1278 1279 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev) 1280 { 1281 struct nlattr *xdp; 1282 u32 prog_id; 1283 int err; 1284 1285 xdp = nla_nest_start(skb, IFLA_XDP); 1286 if (!xdp) 1287 return -EMSGSIZE; 1288 1289 err = nla_put_u8(skb, IFLA_XDP_ATTACHED, 1290 rtnl_xdp_attached_mode(dev, &prog_id)); 1291 if (err) 1292 goto err_cancel; 1293 1294 if (prog_id) { 1295 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id); 1296 if (err) 1297 goto err_cancel; 1298 } 1299 1300 nla_nest_end(skb, xdp); 1301 return 0; 1302 1303 err_cancel: 1304 nla_nest_cancel(skb, xdp); 1305 return err; 1306 } 1307 1308 static u32 rtnl_get_event(unsigned long event) 1309 { 1310 u32 rtnl_event_type = IFLA_EVENT_NONE; 1311 1312 switch (event) { 1313 case NETDEV_REBOOT: 1314 rtnl_event_type = IFLA_EVENT_REBOOT; 1315 break; 1316 case NETDEV_FEAT_CHANGE: 1317 rtnl_event_type = IFLA_EVENT_FEATURES; 1318 break; 1319 case NETDEV_BONDING_FAILOVER: 1320 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER; 1321 break; 1322 case NETDEV_NOTIFY_PEERS: 1323 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS; 1324 break; 1325 case NETDEV_RESEND_IGMP: 1326 rtnl_event_type = IFLA_EVENT_IGMP_RESEND; 1327 break; 1328 case NETDEV_CHANGEINFODATA: 1329 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS; 1330 break; 1331 default: 1332 break; 1333 } 1334 1335 return rtnl_event_type; 1336 } 1337 1338 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev) 1339 { 1340 const struct net_device *upper_dev; 1341 int ret = 0; 1342 1343 rcu_read_lock(); 1344 1345 upper_dev = netdev_master_upper_dev_get_rcu(dev); 1346 if (upper_dev) 1347 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex); 1348 1349 rcu_read_unlock(); 1350 return ret; 1351 } 1352 1353 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev) 1354 { 1355 int ifindex = dev_get_iflink(dev); 1356 1357 if (dev->ifindex == ifindex) 1358 return 0; 1359 1360 return nla_put_u32(skb, IFLA_LINK, ifindex); 1361 } 1362 1363 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb, 1364 struct net_device *dev) 1365 { 1366 char buf[IFALIASZ]; 1367 int ret; 1368 1369 ret = dev_get_alias(dev, buf, sizeof(buf)); 1370 return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0; 1371 } 1372 1373 static int rtnl_fill_link_netnsid(struct sk_buff *skb, 1374 const struct net_device *dev, 1375 struct net *src_net) 1376 { 1377 if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) { 1378 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1379 1380 if (!net_eq(dev_net(dev), link_net)) { 1381 int id = peernet2id_alloc(src_net, link_net); 1382 1383 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1384 return -EMSGSIZE; 1385 } 1386 } 1387 1388 return 0; 1389 } 1390 1391 static int rtnl_fill_link_af(struct sk_buff *skb, 1392 const struct net_device *dev, 1393 u32 ext_filter_mask) 1394 { 1395 const struct rtnl_af_ops *af_ops; 1396 struct nlattr *af_spec; 1397 1398 af_spec = nla_nest_start(skb, IFLA_AF_SPEC); 1399 if (!af_spec) 1400 return -EMSGSIZE; 1401 1402 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 1403 struct nlattr *af; 1404 int err; 1405 1406 if (!af_ops->fill_link_af) 1407 continue; 1408 1409 af = nla_nest_start(skb, af_ops->family); 1410 if (!af) 1411 return -EMSGSIZE; 1412 1413 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1414 /* 1415 * Caller may return ENODATA to indicate that there 1416 * was no data to be dumped. This is not an error, it 1417 * means we should trim the attribute header and 1418 * continue. 1419 */ 1420 if (err == -ENODATA) 1421 nla_nest_cancel(skb, af); 1422 else if (err < 0) 1423 return -EMSGSIZE; 1424 1425 nla_nest_end(skb, af); 1426 } 1427 1428 nla_nest_end(skb, af_spec); 1429 return 0; 1430 } 1431 1432 static int rtnl_fill_ifinfo(struct sk_buff *skb, 1433 struct net_device *dev, struct net *src_net, 1434 int type, u32 pid, u32 seq, u32 change, 1435 unsigned int flags, u32 ext_filter_mask, 1436 u32 event, int *new_nsid, int tgt_netnsid) 1437 { 1438 struct ifinfomsg *ifm; 1439 struct nlmsghdr *nlh; 1440 1441 ASSERT_RTNL(); 1442 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1443 if (nlh == NULL) 1444 return -EMSGSIZE; 1445 1446 ifm = nlmsg_data(nlh); 1447 ifm->ifi_family = AF_UNSPEC; 1448 ifm->__ifi_pad = 0; 1449 ifm->ifi_type = dev->type; 1450 ifm->ifi_index = dev->ifindex; 1451 ifm->ifi_flags = dev_get_flags(dev); 1452 ifm->ifi_change = change; 1453 1454 if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_IF_NETNSID, tgt_netnsid)) 1455 goto nla_put_failure; 1456 1457 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1458 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1459 nla_put_u8(skb, IFLA_OPERSTATE, 1460 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1461 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1462 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1463 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1464 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1465 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1466 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) || 1467 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) || 1468 #ifdef CONFIG_RPS 1469 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1470 #endif 1471 nla_put_iflink(skb, dev) || 1472 put_master_ifindex(skb, dev) || 1473 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1474 (dev->qdisc && 1475 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1476 nla_put_ifalias(skb, dev) || 1477 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1478 atomic_read(&dev->carrier_changes)) || 1479 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1480 goto nla_put_failure; 1481 1482 if (event != IFLA_EVENT_NONE) { 1483 if (nla_put_u32(skb, IFLA_EVENT, event)) 1484 goto nla_put_failure; 1485 } 1486 1487 if (rtnl_fill_link_ifmap(skb, dev)) 1488 goto nla_put_failure; 1489 1490 if (dev->addr_len) { 1491 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1492 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1493 goto nla_put_failure; 1494 } 1495 1496 if (rtnl_phys_port_id_fill(skb, dev)) 1497 goto nla_put_failure; 1498 1499 if (rtnl_phys_port_name_fill(skb, dev)) 1500 goto nla_put_failure; 1501 1502 if (rtnl_phys_switch_id_fill(skb, dev)) 1503 goto nla_put_failure; 1504 1505 if (rtnl_fill_stats(skb, dev)) 1506 goto nla_put_failure; 1507 1508 if (rtnl_fill_vf(skb, dev, ext_filter_mask)) 1509 goto nla_put_failure; 1510 1511 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1512 goto nla_put_failure; 1513 1514 if (rtnl_xdp_fill(skb, dev)) 1515 goto nla_put_failure; 1516 1517 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1518 if (rtnl_link_fill(skb, dev) < 0) 1519 goto nla_put_failure; 1520 } 1521 1522 if (rtnl_fill_link_netnsid(skb, dev, src_net)) 1523 goto nla_put_failure; 1524 1525 if (new_nsid && 1526 nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0) 1527 goto nla_put_failure; 1528 1529 rcu_read_lock(); 1530 if (rtnl_fill_link_af(skb, dev, ext_filter_mask)) 1531 goto nla_put_failure_rcu; 1532 rcu_read_unlock(); 1533 1534 nlmsg_end(skb, nlh); 1535 return 0; 1536 1537 nla_put_failure_rcu: 1538 rcu_read_unlock(); 1539 nla_put_failure: 1540 nlmsg_cancel(skb, nlh); 1541 return -EMSGSIZE; 1542 } 1543 1544 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1545 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1546 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1547 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1548 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1549 [IFLA_MTU] = { .type = NLA_U32 }, 1550 [IFLA_LINK] = { .type = NLA_U32 }, 1551 [IFLA_MASTER] = { .type = NLA_U32 }, 1552 [IFLA_CARRIER] = { .type = NLA_U8 }, 1553 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1554 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1555 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1556 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1557 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1558 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1559 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1560 /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to 1561 * allow 0-length string (needed to remove an alias). 1562 */ 1563 [IFLA_IFALIAS] = { .type = NLA_BINARY, .len = IFALIASZ - 1 }, 1564 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1565 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1566 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1567 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1568 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1569 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1570 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1571 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1572 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1573 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1574 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1575 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1576 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1577 [IFLA_XDP] = { .type = NLA_NESTED }, 1578 [IFLA_EVENT] = { .type = NLA_U32 }, 1579 [IFLA_GROUP] = { .type = NLA_U32 }, 1580 [IFLA_IF_NETNSID] = { .type = NLA_S32 }, 1581 }; 1582 1583 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1584 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1585 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1586 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1587 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1588 }; 1589 1590 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1591 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1592 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1593 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED }, 1594 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1595 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1596 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1597 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1598 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1599 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1600 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1601 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1602 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1603 }; 1604 1605 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1606 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1607 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1608 .len = PORT_PROFILE_MAX }, 1609 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1610 .len = PORT_UUID_MAX }, 1611 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1612 .len = PORT_UUID_MAX }, 1613 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1614 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1615 1616 /* Unused, but we need to keep it here since user space could 1617 * fill it. It's also broken with regard to NLA_BINARY use in 1618 * combination with structs. 1619 */ 1620 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1621 .len = sizeof(struct ifla_port_vsi) }, 1622 }; 1623 1624 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = { 1625 [IFLA_XDP_FD] = { .type = NLA_S32 }, 1626 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 }, 1627 [IFLA_XDP_FLAGS] = { .type = NLA_U32 }, 1628 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 }, 1629 }; 1630 1631 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 1632 { 1633 const struct rtnl_link_ops *ops = NULL; 1634 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 1635 1636 if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, 1637 ifla_info_policy, NULL) < 0) 1638 return NULL; 1639 1640 if (linfo[IFLA_INFO_KIND]) { 1641 char kind[MODULE_NAME_LEN]; 1642 1643 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 1644 ops = rtnl_link_ops_get(kind); 1645 } 1646 1647 return ops; 1648 } 1649 1650 static bool link_master_filtered(struct net_device *dev, int master_idx) 1651 { 1652 struct net_device *master; 1653 1654 if (!master_idx) 1655 return false; 1656 1657 master = netdev_master_upper_dev_get(dev); 1658 if (!master || master->ifindex != master_idx) 1659 return true; 1660 1661 return false; 1662 } 1663 1664 static bool link_kind_filtered(const struct net_device *dev, 1665 const struct rtnl_link_ops *kind_ops) 1666 { 1667 if (kind_ops && dev->rtnl_link_ops != kind_ops) 1668 return true; 1669 1670 return false; 1671 } 1672 1673 static bool link_dump_filtered(struct net_device *dev, 1674 int master_idx, 1675 const struct rtnl_link_ops *kind_ops) 1676 { 1677 if (link_master_filtered(dev, master_idx) || 1678 link_kind_filtered(dev, kind_ops)) 1679 return true; 1680 1681 return false; 1682 } 1683 1684 static struct net *get_target_net(struct sk_buff *skb, int netnsid) 1685 { 1686 struct net *net; 1687 1688 net = get_net_ns_by_id(sock_net(skb->sk), netnsid); 1689 if (!net) 1690 return ERR_PTR(-EINVAL); 1691 1692 /* For now, the caller is required to have CAP_NET_ADMIN in 1693 * the user namespace owning the target net ns. 1694 */ 1695 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1696 put_net(net); 1697 return ERR_PTR(-EACCES); 1698 } 1699 return net; 1700 } 1701 1702 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1703 { 1704 struct net *net = sock_net(skb->sk); 1705 struct net *tgt_net = net; 1706 int h, s_h; 1707 int idx = 0, s_idx; 1708 struct net_device *dev; 1709 struct hlist_head *head; 1710 struct nlattr *tb[IFLA_MAX+1]; 1711 u32 ext_filter_mask = 0; 1712 const struct rtnl_link_ops *kind_ops = NULL; 1713 unsigned int flags = NLM_F_MULTI; 1714 int master_idx = 0; 1715 int netnsid = -1; 1716 int err; 1717 int hdrlen; 1718 1719 s_h = cb->args[0]; 1720 s_idx = cb->args[1]; 1721 1722 /* A hack to preserve kernel<->userspace interface. 1723 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1724 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1725 * what iproute2 < v3.9.0 used. 1726 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1727 * attribute, its netlink message is shorter than struct ifinfomsg. 1728 */ 1729 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1730 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1731 1732 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, 1733 ifla_policy, NULL) >= 0) { 1734 if (tb[IFLA_IF_NETNSID]) { 1735 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]); 1736 tgt_net = get_target_net(skb, netnsid); 1737 if (IS_ERR(tgt_net)) { 1738 tgt_net = net; 1739 netnsid = -1; 1740 } 1741 } 1742 1743 if (tb[IFLA_EXT_MASK]) 1744 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1745 1746 if (tb[IFLA_MASTER]) 1747 master_idx = nla_get_u32(tb[IFLA_MASTER]); 1748 1749 if (tb[IFLA_LINKINFO]) 1750 kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]); 1751 1752 if (master_idx || kind_ops) 1753 flags |= NLM_F_DUMP_FILTERED; 1754 } 1755 1756 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1757 idx = 0; 1758 head = &tgt_net->dev_index_head[h]; 1759 hlist_for_each_entry(dev, head, index_hlist) { 1760 if (link_dump_filtered(dev, master_idx, kind_ops)) 1761 goto cont; 1762 if (idx < s_idx) 1763 goto cont; 1764 err = rtnl_fill_ifinfo(skb, dev, net, 1765 RTM_NEWLINK, 1766 NETLINK_CB(cb->skb).portid, 1767 cb->nlh->nlmsg_seq, 0, 1768 flags, 1769 ext_filter_mask, 0, NULL, 1770 netnsid); 1771 1772 if (err < 0) { 1773 if (likely(skb->len)) 1774 goto out; 1775 1776 goto out_err; 1777 } 1778 cont: 1779 idx++; 1780 } 1781 } 1782 out: 1783 err = skb->len; 1784 out_err: 1785 cb->args[1] = idx; 1786 cb->args[0] = h; 1787 cb->seq = net->dev_base_seq; 1788 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1789 if (netnsid >= 0) 1790 put_net(tgt_net); 1791 1792 return err; 1793 } 1794 1795 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len, 1796 struct netlink_ext_ack *exterr) 1797 { 1798 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy, exterr); 1799 } 1800 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1801 1802 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1803 { 1804 struct net *net; 1805 /* Examine the link attributes and figure out which 1806 * network namespace we are talking about. 1807 */ 1808 if (tb[IFLA_NET_NS_PID]) 1809 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1810 else if (tb[IFLA_NET_NS_FD]) 1811 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1812 else 1813 net = get_net(src_net); 1814 return net; 1815 } 1816 EXPORT_SYMBOL(rtnl_link_get_net); 1817 1818 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1819 { 1820 if (dev) { 1821 if (tb[IFLA_ADDRESS] && 1822 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1823 return -EINVAL; 1824 1825 if (tb[IFLA_BROADCAST] && 1826 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1827 return -EINVAL; 1828 } 1829 1830 if (tb[IFLA_AF_SPEC]) { 1831 struct nlattr *af; 1832 int rem, err; 1833 1834 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1835 const struct rtnl_af_ops *af_ops; 1836 1837 rcu_read_lock(); 1838 af_ops = rtnl_af_lookup(nla_type(af)); 1839 if (!af_ops) { 1840 rcu_read_unlock(); 1841 return -EAFNOSUPPORT; 1842 } 1843 1844 if (!af_ops->set_link_af) { 1845 rcu_read_unlock(); 1846 return -EOPNOTSUPP; 1847 } 1848 1849 if (af_ops->validate_link_af) { 1850 err = af_ops->validate_link_af(dev, af); 1851 if (err < 0) { 1852 rcu_read_unlock(); 1853 return err; 1854 } 1855 } 1856 1857 rcu_read_unlock(); 1858 } 1859 } 1860 1861 return 0; 1862 } 1863 1864 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt, 1865 int guid_type) 1866 { 1867 const struct net_device_ops *ops = dev->netdev_ops; 1868 1869 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type); 1870 } 1871 1872 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type) 1873 { 1874 if (dev->type != ARPHRD_INFINIBAND) 1875 return -EOPNOTSUPP; 1876 1877 return handle_infiniband_guid(dev, ivt, guid_type); 1878 } 1879 1880 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 1881 { 1882 const struct net_device_ops *ops = dev->netdev_ops; 1883 int err = -EINVAL; 1884 1885 if (tb[IFLA_VF_MAC]) { 1886 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 1887 1888 err = -EOPNOTSUPP; 1889 if (ops->ndo_set_vf_mac) 1890 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1891 ivm->mac); 1892 if (err < 0) 1893 return err; 1894 } 1895 1896 if (tb[IFLA_VF_VLAN]) { 1897 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 1898 1899 err = -EOPNOTSUPP; 1900 if (ops->ndo_set_vf_vlan) 1901 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 1902 ivv->qos, 1903 htons(ETH_P_8021Q)); 1904 if (err < 0) 1905 return err; 1906 } 1907 1908 if (tb[IFLA_VF_VLAN_LIST]) { 1909 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN]; 1910 struct nlattr *attr; 1911 int rem, len = 0; 1912 1913 err = -EOPNOTSUPP; 1914 if (!ops->ndo_set_vf_vlan) 1915 return err; 1916 1917 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) { 1918 if (nla_type(attr) != IFLA_VF_VLAN_INFO || 1919 nla_len(attr) < NLA_HDRLEN) { 1920 return -EINVAL; 1921 } 1922 if (len >= MAX_VLAN_LIST_LEN) 1923 return -EOPNOTSUPP; 1924 ivvl[len] = nla_data(attr); 1925 1926 len++; 1927 } 1928 if (len == 0) 1929 return -EINVAL; 1930 1931 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan, 1932 ivvl[0]->qos, ivvl[0]->vlan_proto); 1933 if (err < 0) 1934 return err; 1935 } 1936 1937 if (tb[IFLA_VF_TX_RATE]) { 1938 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1939 struct ifla_vf_info ivf; 1940 1941 err = -EOPNOTSUPP; 1942 if (ops->ndo_get_vf_config) 1943 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 1944 if (err < 0) 1945 return err; 1946 1947 err = -EOPNOTSUPP; 1948 if (ops->ndo_set_vf_rate) 1949 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1950 ivf.min_tx_rate, 1951 ivt->rate); 1952 if (err < 0) 1953 return err; 1954 } 1955 1956 if (tb[IFLA_VF_RATE]) { 1957 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 1958 1959 err = -EOPNOTSUPP; 1960 if (ops->ndo_set_vf_rate) 1961 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1962 ivt->min_tx_rate, 1963 ivt->max_tx_rate); 1964 if (err < 0) 1965 return err; 1966 } 1967 1968 if (tb[IFLA_VF_SPOOFCHK]) { 1969 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 1970 1971 err = -EOPNOTSUPP; 1972 if (ops->ndo_set_vf_spoofchk) 1973 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1974 ivs->setting); 1975 if (err < 0) 1976 return err; 1977 } 1978 1979 if (tb[IFLA_VF_LINK_STATE]) { 1980 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 1981 1982 err = -EOPNOTSUPP; 1983 if (ops->ndo_set_vf_link_state) 1984 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1985 ivl->link_state); 1986 if (err < 0) 1987 return err; 1988 } 1989 1990 if (tb[IFLA_VF_RSS_QUERY_EN]) { 1991 struct ifla_vf_rss_query_en *ivrssq_en; 1992 1993 err = -EOPNOTSUPP; 1994 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 1995 if (ops->ndo_set_vf_rss_query_en) 1996 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 1997 ivrssq_en->setting); 1998 if (err < 0) 1999 return err; 2000 } 2001 2002 if (tb[IFLA_VF_TRUST]) { 2003 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 2004 2005 err = -EOPNOTSUPP; 2006 if (ops->ndo_set_vf_trust) 2007 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 2008 if (err < 0) 2009 return err; 2010 } 2011 2012 if (tb[IFLA_VF_IB_NODE_GUID]) { 2013 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]); 2014 2015 if (!ops->ndo_set_vf_guid) 2016 return -EOPNOTSUPP; 2017 2018 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID); 2019 } 2020 2021 if (tb[IFLA_VF_IB_PORT_GUID]) { 2022 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]); 2023 2024 if (!ops->ndo_set_vf_guid) 2025 return -EOPNOTSUPP; 2026 2027 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID); 2028 } 2029 2030 return err; 2031 } 2032 2033 static int do_set_master(struct net_device *dev, int ifindex, 2034 struct netlink_ext_ack *extack) 2035 { 2036 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 2037 const struct net_device_ops *ops; 2038 int err; 2039 2040 if (upper_dev) { 2041 if (upper_dev->ifindex == ifindex) 2042 return 0; 2043 ops = upper_dev->netdev_ops; 2044 if (ops->ndo_del_slave) { 2045 err = ops->ndo_del_slave(upper_dev, dev); 2046 if (err) 2047 return err; 2048 } else { 2049 return -EOPNOTSUPP; 2050 } 2051 } 2052 2053 if (ifindex) { 2054 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 2055 if (!upper_dev) 2056 return -EINVAL; 2057 ops = upper_dev->netdev_ops; 2058 if (ops->ndo_add_slave) { 2059 err = ops->ndo_add_slave(upper_dev, dev, extack); 2060 if (err) 2061 return err; 2062 } else { 2063 return -EOPNOTSUPP; 2064 } 2065 } 2066 return 0; 2067 } 2068 2069 #define DO_SETLINK_MODIFIED 0x01 2070 /* notify flag means notify + modified. */ 2071 #define DO_SETLINK_NOTIFY 0x03 2072 static int do_setlink(const struct sk_buff *skb, 2073 struct net_device *dev, struct ifinfomsg *ifm, 2074 struct netlink_ext_ack *extack, 2075 struct nlattr **tb, char *ifname, int status) 2076 { 2077 const struct net_device_ops *ops = dev->netdev_ops; 2078 int err; 2079 2080 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 2081 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 2082 if (IS_ERR(net)) { 2083 err = PTR_ERR(net); 2084 goto errout; 2085 } 2086 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 2087 put_net(net); 2088 err = -EPERM; 2089 goto errout; 2090 } 2091 err = dev_change_net_namespace(dev, net, ifname); 2092 put_net(net); 2093 if (err) 2094 goto errout; 2095 status |= DO_SETLINK_MODIFIED; 2096 } 2097 2098 if (tb[IFLA_MAP]) { 2099 struct rtnl_link_ifmap *u_map; 2100 struct ifmap k_map; 2101 2102 if (!ops->ndo_set_config) { 2103 err = -EOPNOTSUPP; 2104 goto errout; 2105 } 2106 2107 if (!netif_device_present(dev)) { 2108 err = -ENODEV; 2109 goto errout; 2110 } 2111 2112 u_map = nla_data(tb[IFLA_MAP]); 2113 k_map.mem_start = (unsigned long) u_map->mem_start; 2114 k_map.mem_end = (unsigned long) u_map->mem_end; 2115 k_map.base_addr = (unsigned short) u_map->base_addr; 2116 k_map.irq = (unsigned char) u_map->irq; 2117 k_map.dma = (unsigned char) u_map->dma; 2118 k_map.port = (unsigned char) u_map->port; 2119 2120 err = ops->ndo_set_config(dev, &k_map); 2121 if (err < 0) 2122 goto errout; 2123 2124 status |= DO_SETLINK_NOTIFY; 2125 } 2126 2127 if (tb[IFLA_ADDRESS]) { 2128 struct sockaddr *sa; 2129 int len; 2130 2131 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len, 2132 sizeof(*sa)); 2133 sa = kmalloc(len, GFP_KERNEL); 2134 if (!sa) { 2135 err = -ENOMEM; 2136 goto errout; 2137 } 2138 sa->sa_family = dev->type; 2139 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 2140 dev->addr_len); 2141 err = dev_set_mac_address(dev, sa); 2142 kfree(sa); 2143 if (err) 2144 goto errout; 2145 status |= DO_SETLINK_MODIFIED; 2146 } 2147 2148 if (tb[IFLA_MTU]) { 2149 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 2150 if (err < 0) 2151 goto errout; 2152 status |= DO_SETLINK_MODIFIED; 2153 } 2154 2155 if (tb[IFLA_GROUP]) { 2156 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2157 status |= DO_SETLINK_NOTIFY; 2158 } 2159 2160 /* 2161 * Interface selected by interface index but interface 2162 * name provided implies that a name change has been 2163 * requested. 2164 */ 2165 if (ifm->ifi_index > 0 && ifname[0]) { 2166 err = dev_change_name(dev, ifname); 2167 if (err < 0) 2168 goto errout; 2169 status |= DO_SETLINK_MODIFIED; 2170 } 2171 2172 if (tb[IFLA_IFALIAS]) { 2173 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 2174 nla_len(tb[IFLA_IFALIAS])); 2175 if (err < 0) 2176 goto errout; 2177 status |= DO_SETLINK_NOTIFY; 2178 } 2179 2180 if (tb[IFLA_BROADCAST]) { 2181 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 2182 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 2183 } 2184 2185 if (ifm->ifi_flags || ifm->ifi_change) { 2186 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2187 if (err < 0) 2188 goto errout; 2189 } 2190 2191 if (tb[IFLA_MASTER]) { 2192 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); 2193 if (err) 2194 goto errout; 2195 status |= DO_SETLINK_MODIFIED; 2196 } 2197 2198 if (tb[IFLA_CARRIER]) { 2199 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 2200 if (err) 2201 goto errout; 2202 status |= DO_SETLINK_MODIFIED; 2203 } 2204 2205 if (tb[IFLA_TXQLEN]) { 2206 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]); 2207 unsigned int orig_len = dev->tx_queue_len; 2208 2209 if (dev->tx_queue_len ^ value) { 2210 dev->tx_queue_len = value; 2211 err = call_netdevice_notifiers( 2212 NETDEV_CHANGE_TX_QUEUE_LEN, dev); 2213 err = notifier_to_errno(err); 2214 if (err) { 2215 dev->tx_queue_len = orig_len; 2216 goto errout; 2217 } 2218 status |= DO_SETLINK_MODIFIED; 2219 } 2220 } 2221 2222 if (tb[IFLA_OPERSTATE]) 2223 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2224 2225 if (tb[IFLA_LINKMODE]) { 2226 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 2227 2228 write_lock_bh(&dev_base_lock); 2229 if (dev->link_mode ^ value) 2230 status |= DO_SETLINK_NOTIFY; 2231 dev->link_mode = value; 2232 write_unlock_bh(&dev_base_lock); 2233 } 2234 2235 if (tb[IFLA_VFINFO_LIST]) { 2236 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 2237 struct nlattr *attr; 2238 int rem; 2239 2240 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 2241 if (nla_type(attr) != IFLA_VF_INFO || 2242 nla_len(attr) < NLA_HDRLEN) { 2243 err = -EINVAL; 2244 goto errout; 2245 } 2246 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 2247 ifla_vf_policy, NULL); 2248 if (err < 0) 2249 goto errout; 2250 err = do_setvfinfo(dev, vfinfo); 2251 if (err < 0) 2252 goto errout; 2253 status |= DO_SETLINK_NOTIFY; 2254 } 2255 } 2256 err = 0; 2257 2258 if (tb[IFLA_VF_PORTS]) { 2259 struct nlattr *port[IFLA_PORT_MAX+1]; 2260 struct nlattr *attr; 2261 int vf; 2262 int rem; 2263 2264 err = -EOPNOTSUPP; 2265 if (!ops->ndo_set_vf_port) 2266 goto errout; 2267 2268 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 2269 if (nla_type(attr) != IFLA_VF_PORT || 2270 nla_len(attr) < NLA_HDRLEN) { 2271 err = -EINVAL; 2272 goto errout; 2273 } 2274 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 2275 ifla_port_policy, NULL); 2276 if (err < 0) 2277 goto errout; 2278 if (!port[IFLA_PORT_VF]) { 2279 err = -EOPNOTSUPP; 2280 goto errout; 2281 } 2282 vf = nla_get_u32(port[IFLA_PORT_VF]); 2283 err = ops->ndo_set_vf_port(dev, vf, port); 2284 if (err < 0) 2285 goto errout; 2286 status |= DO_SETLINK_NOTIFY; 2287 } 2288 } 2289 err = 0; 2290 2291 if (tb[IFLA_PORT_SELF]) { 2292 struct nlattr *port[IFLA_PORT_MAX+1]; 2293 2294 err = nla_parse_nested(port, IFLA_PORT_MAX, 2295 tb[IFLA_PORT_SELF], ifla_port_policy, 2296 NULL); 2297 if (err < 0) 2298 goto errout; 2299 2300 err = -EOPNOTSUPP; 2301 if (ops->ndo_set_vf_port) 2302 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 2303 if (err < 0) 2304 goto errout; 2305 status |= DO_SETLINK_NOTIFY; 2306 } 2307 2308 if (tb[IFLA_AF_SPEC]) { 2309 struct nlattr *af; 2310 int rem; 2311 2312 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2313 const struct rtnl_af_ops *af_ops; 2314 2315 rcu_read_lock(); 2316 2317 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af)))); 2318 2319 err = af_ops->set_link_af(dev, af); 2320 if (err < 0) { 2321 rcu_read_unlock(); 2322 goto errout; 2323 } 2324 2325 rcu_read_unlock(); 2326 status |= DO_SETLINK_NOTIFY; 2327 } 2328 } 2329 err = 0; 2330 2331 if (tb[IFLA_PROTO_DOWN]) { 2332 err = dev_change_proto_down(dev, 2333 nla_get_u8(tb[IFLA_PROTO_DOWN])); 2334 if (err) 2335 goto errout; 2336 status |= DO_SETLINK_NOTIFY; 2337 } 2338 2339 if (tb[IFLA_XDP]) { 2340 struct nlattr *xdp[IFLA_XDP_MAX + 1]; 2341 u32 xdp_flags = 0; 2342 2343 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP], 2344 ifla_xdp_policy, NULL); 2345 if (err < 0) 2346 goto errout; 2347 2348 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) { 2349 err = -EINVAL; 2350 goto errout; 2351 } 2352 2353 if (xdp[IFLA_XDP_FLAGS]) { 2354 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]); 2355 if (xdp_flags & ~XDP_FLAGS_MASK) { 2356 err = -EINVAL; 2357 goto errout; 2358 } 2359 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) { 2360 err = -EINVAL; 2361 goto errout; 2362 } 2363 } 2364 2365 if (xdp[IFLA_XDP_FD]) { 2366 err = dev_change_xdp_fd(dev, extack, 2367 nla_get_s32(xdp[IFLA_XDP_FD]), 2368 xdp_flags); 2369 if (err) 2370 goto errout; 2371 status |= DO_SETLINK_NOTIFY; 2372 } 2373 } 2374 2375 errout: 2376 if (status & DO_SETLINK_MODIFIED) { 2377 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY) 2378 netdev_state_change(dev); 2379 2380 if (err < 0) 2381 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", 2382 dev->name); 2383 } 2384 2385 return err; 2386 } 2387 2388 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 2389 struct netlink_ext_ack *extack) 2390 { 2391 struct net *net = sock_net(skb->sk); 2392 struct ifinfomsg *ifm; 2393 struct net_device *dev; 2394 int err; 2395 struct nlattr *tb[IFLA_MAX+1]; 2396 char ifname[IFNAMSIZ]; 2397 2398 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, 2399 extack); 2400 if (err < 0) 2401 goto errout; 2402 2403 if (tb[IFLA_IF_NETNSID]) 2404 return -EOPNOTSUPP; 2405 2406 if (tb[IFLA_IFNAME]) 2407 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2408 else 2409 ifname[0] = '\0'; 2410 2411 err = -EINVAL; 2412 ifm = nlmsg_data(nlh); 2413 if (ifm->ifi_index > 0) 2414 dev = __dev_get_by_index(net, ifm->ifi_index); 2415 else if (tb[IFLA_IFNAME]) 2416 dev = __dev_get_by_name(net, ifname); 2417 else 2418 goto errout; 2419 2420 if (dev == NULL) { 2421 err = -ENODEV; 2422 goto errout; 2423 } 2424 2425 err = validate_linkmsg(dev, tb); 2426 if (err < 0) 2427 goto errout; 2428 2429 err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0); 2430 errout: 2431 return err; 2432 } 2433 2434 static int rtnl_group_dellink(const struct net *net, int group) 2435 { 2436 struct net_device *dev, *aux; 2437 LIST_HEAD(list_kill); 2438 bool found = false; 2439 2440 if (!group) 2441 return -EPERM; 2442 2443 for_each_netdev(net, dev) { 2444 if (dev->group == group) { 2445 const struct rtnl_link_ops *ops; 2446 2447 found = true; 2448 ops = dev->rtnl_link_ops; 2449 if (!ops || !ops->dellink) 2450 return -EOPNOTSUPP; 2451 } 2452 } 2453 2454 if (!found) 2455 return -ENODEV; 2456 2457 for_each_netdev_safe(net, dev, aux) { 2458 if (dev->group == group) { 2459 const struct rtnl_link_ops *ops; 2460 2461 ops = dev->rtnl_link_ops; 2462 ops->dellink(dev, &list_kill); 2463 } 2464 } 2465 unregister_netdevice_many(&list_kill); 2466 2467 return 0; 2468 } 2469 2470 int rtnl_delete_link(struct net_device *dev) 2471 { 2472 const struct rtnl_link_ops *ops; 2473 LIST_HEAD(list_kill); 2474 2475 ops = dev->rtnl_link_ops; 2476 if (!ops || !ops->dellink) 2477 return -EOPNOTSUPP; 2478 2479 ops->dellink(dev, &list_kill); 2480 unregister_netdevice_many(&list_kill); 2481 2482 return 0; 2483 } 2484 EXPORT_SYMBOL_GPL(rtnl_delete_link); 2485 2486 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 2487 struct netlink_ext_ack *extack) 2488 { 2489 struct net *net = sock_net(skb->sk); 2490 struct net_device *dev; 2491 struct ifinfomsg *ifm; 2492 char ifname[IFNAMSIZ]; 2493 struct nlattr *tb[IFLA_MAX+1]; 2494 int err; 2495 2496 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack); 2497 if (err < 0) 2498 return err; 2499 2500 if (tb[IFLA_IF_NETNSID]) 2501 return -EOPNOTSUPP; 2502 2503 if (tb[IFLA_IFNAME]) 2504 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2505 2506 ifm = nlmsg_data(nlh); 2507 if (ifm->ifi_index > 0) 2508 dev = __dev_get_by_index(net, ifm->ifi_index); 2509 else if (tb[IFLA_IFNAME]) 2510 dev = __dev_get_by_name(net, ifname); 2511 else if (tb[IFLA_GROUP]) 2512 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 2513 else 2514 return -EINVAL; 2515 2516 if (!dev) 2517 return -ENODEV; 2518 2519 return rtnl_delete_link(dev); 2520 } 2521 2522 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 2523 { 2524 unsigned int old_flags; 2525 int err; 2526 2527 old_flags = dev->flags; 2528 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2529 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2530 if (err < 0) 2531 return err; 2532 } 2533 2534 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2535 2536 __dev_notify_flags(dev, old_flags, ~0U); 2537 return 0; 2538 } 2539 EXPORT_SYMBOL(rtnl_configure_link); 2540 2541 struct net_device *rtnl_create_link(struct net *net, 2542 const char *ifname, unsigned char name_assign_type, 2543 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2544 { 2545 struct net_device *dev; 2546 unsigned int num_tx_queues = 1; 2547 unsigned int num_rx_queues = 1; 2548 2549 if (tb[IFLA_NUM_TX_QUEUES]) 2550 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2551 else if (ops->get_num_tx_queues) 2552 num_tx_queues = ops->get_num_tx_queues(); 2553 2554 if (tb[IFLA_NUM_RX_QUEUES]) 2555 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2556 else if (ops->get_num_rx_queues) 2557 num_rx_queues = ops->get_num_rx_queues(); 2558 2559 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2560 ops->setup, num_tx_queues, num_rx_queues); 2561 if (!dev) 2562 return ERR_PTR(-ENOMEM); 2563 2564 dev_net_set(dev, net); 2565 dev->rtnl_link_ops = ops; 2566 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2567 2568 if (tb[IFLA_MTU]) 2569 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2570 if (tb[IFLA_ADDRESS]) { 2571 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2572 nla_len(tb[IFLA_ADDRESS])); 2573 dev->addr_assign_type = NET_ADDR_SET; 2574 } 2575 if (tb[IFLA_BROADCAST]) 2576 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2577 nla_len(tb[IFLA_BROADCAST])); 2578 if (tb[IFLA_TXQLEN]) 2579 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2580 if (tb[IFLA_OPERSTATE]) 2581 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2582 if (tb[IFLA_LINKMODE]) 2583 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2584 if (tb[IFLA_GROUP]) 2585 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2586 2587 return dev; 2588 } 2589 EXPORT_SYMBOL(rtnl_create_link); 2590 2591 static int rtnl_group_changelink(const struct sk_buff *skb, 2592 struct net *net, int group, 2593 struct ifinfomsg *ifm, 2594 struct netlink_ext_ack *extack, 2595 struct nlattr **tb) 2596 { 2597 struct net_device *dev, *aux; 2598 int err; 2599 2600 for_each_netdev_safe(net, dev, aux) { 2601 if (dev->group == group) { 2602 err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0); 2603 if (err < 0) 2604 return err; 2605 } 2606 } 2607 2608 return 0; 2609 } 2610 2611 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, 2612 struct netlink_ext_ack *extack) 2613 { 2614 struct net *net = sock_net(skb->sk); 2615 const struct rtnl_link_ops *ops; 2616 const struct rtnl_link_ops *m_ops = NULL; 2617 struct net_device *dev; 2618 struct net_device *master_dev = NULL; 2619 struct ifinfomsg *ifm; 2620 char kind[MODULE_NAME_LEN]; 2621 char ifname[IFNAMSIZ]; 2622 struct nlattr *tb[IFLA_MAX+1]; 2623 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2624 unsigned char name_assign_type = NET_NAME_USER; 2625 int err; 2626 2627 #ifdef CONFIG_MODULES 2628 replay: 2629 #endif 2630 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack); 2631 if (err < 0) 2632 return err; 2633 2634 if (tb[IFLA_IF_NETNSID]) 2635 return -EOPNOTSUPP; 2636 2637 if (tb[IFLA_IFNAME]) 2638 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2639 else 2640 ifname[0] = '\0'; 2641 2642 ifm = nlmsg_data(nlh); 2643 if (ifm->ifi_index > 0) 2644 dev = __dev_get_by_index(net, ifm->ifi_index); 2645 else { 2646 if (ifname[0]) 2647 dev = __dev_get_by_name(net, ifname); 2648 else 2649 dev = NULL; 2650 } 2651 2652 if (dev) { 2653 master_dev = netdev_master_upper_dev_get(dev); 2654 if (master_dev) 2655 m_ops = master_dev->rtnl_link_ops; 2656 } 2657 2658 err = validate_linkmsg(dev, tb); 2659 if (err < 0) 2660 return err; 2661 2662 if (tb[IFLA_LINKINFO]) { 2663 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2664 tb[IFLA_LINKINFO], ifla_info_policy, 2665 NULL); 2666 if (err < 0) 2667 return err; 2668 } else 2669 memset(linkinfo, 0, sizeof(linkinfo)); 2670 2671 if (linkinfo[IFLA_INFO_KIND]) { 2672 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2673 ops = rtnl_link_ops_get(kind); 2674 } else { 2675 kind[0] = '\0'; 2676 ops = NULL; 2677 } 2678 2679 if (1) { 2680 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2681 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2682 struct nlattr **data = NULL; 2683 struct nlattr **slave_data = NULL; 2684 struct net *dest_net, *link_net = NULL; 2685 2686 if (ops) { 2687 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2688 err = nla_parse_nested(attr, ops->maxtype, 2689 linkinfo[IFLA_INFO_DATA], 2690 ops->policy, NULL); 2691 if (err < 0) 2692 return err; 2693 data = attr; 2694 } 2695 if (ops->validate) { 2696 err = ops->validate(tb, data, extack); 2697 if (err < 0) 2698 return err; 2699 } 2700 } 2701 2702 if (m_ops) { 2703 if (m_ops->slave_maxtype && 2704 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2705 err = nla_parse_nested(slave_attr, 2706 m_ops->slave_maxtype, 2707 linkinfo[IFLA_INFO_SLAVE_DATA], 2708 m_ops->slave_policy, 2709 NULL); 2710 if (err < 0) 2711 return err; 2712 slave_data = slave_attr; 2713 } 2714 } 2715 2716 if (dev) { 2717 int status = 0; 2718 2719 if (nlh->nlmsg_flags & NLM_F_EXCL) 2720 return -EEXIST; 2721 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2722 return -EOPNOTSUPP; 2723 2724 if (linkinfo[IFLA_INFO_DATA]) { 2725 if (!ops || ops != dev->rtnl_link_ops || 2726 !ops->changelink) 2727 return -EOPNOTSUPP; 2728 2729 err = ops->changelink(dev, tb, data, extack); 2730 if (err < 0) 2731 return err; 2732 status |= DO_SETLINK_NOTIFY; 2733 } 2734 2735 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2736 if (!m_ops || !m_ops->slave_changelink) 2737 return -EOPNOTSUPP; 2738 2739 err = m_ops->slave_changelink(master_dev, dev, 2740 tb, slave_data, 2741 extack); 2742 if (err < 0) 2743 return err; 2744 status |= DO_SETLINK_NOTIFY; 2745 } 2746 2747 return do_setlink(skb, dev, ifm, extack, tb, ifname, 2748 status); 2749 } 2750 2751 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2752 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2753 return rtnl_group_changelink(skb, net, 2754 nla_get_u32(tb[IFLA_GROUP]), 2755 ifm, extack, tb); 2756 return -ENODEV; 2757 } 2758 2759 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO]) 2760 return -EOPNOTSUPP; 2761 2762 if (!ops) { 2763 #ifdef CONFIG_MODULES 2764 if (kind[0]) { 2765 __rtnl_unlock(); 2766 request_module("rtnl-link-%s", kind); 2767 rtnl_lock(); 2768 ops = rtnl_link_ops_get(kind); 2769 if (ops) 2770 goto replay; 2771 } 2772 #endif 2773 return -EOPNOTSUPP; 2774 } 2775 2776 if (!ops->setup) 2777 return -EOPNOTSUPP; 2778 2779 if (!ifname[0]) { 2780 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2781 name_assign_type = NET_NAME_ENUM; 2782 } 2783 2784 dest_net = rtnl_link_get_net(net, tb); 2785 if (IS_ERR(dest_net)) 2786 return PTR_ERR(dest_net); 2787 2788 err = -EPERM; 2789 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2790 goto out; 2791 2792 if (tb[IFLA_LINK_NETNSID]) { 2793 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2794 2795 link_net = get_net_ns_by_id(dest_net, id); 2796 if (!link_net) { 2797 err = -EINVAL; 2798 goto out; 2799 } 2800 err = -EPERM; 2801 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2802 goto out; 2803 } 2804 2805 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2806 name_assign_type, ops, tb); 2807 if (IS_ERR(dev)) { 2808 err = PTR_ERR(dev); 2809 goto out; 2810 } 2811 2812 dev->ifindex = ifm->ifi_index; 2813 2814 if (ops->newlink) { 2815 err = ops->newlink(link_net ? : net, dev, tb, data, 2816 extack); 2817 /* Drivers should call free_netdev() in ->destructor 2818 * and unregister it on failure after registration 2819 * so that device could be finally freed in rtnl_unlock. 2820 */ 2821 if (err < 0) { 2822 /* If device is not registered at all, free it now */ 2823 if (dev->reg_state == NETREG_UNINITIALIZED) 2824 free_netdev(dev); 2825 goto out; 2826 } 2827 } else { 2828 err = register_netdevice(dev); 2829 if (err < 0) { 2830 free_netdev(dev); 2831 goto out; 2832 } 2833 } 2834 err = rtnl_configure_link(dev, ifm); 2835 if (err < 0) 2836 goto out_unregister; 2837 if (link_net) { 2838 err = dev_change_net_namespace(dev, dest_net, ifname); 2839 if (err < 0) 2840 goto out_unregister; 2841 } 2842 if (tb[IFLA_MASTER]) { 2843 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), 2844 extack); 2845 if (err) 2846 goto out_unregister; 2847 } 2848 out: 2849 if (link_net) 2850 put_net(link_net); 2851 put_net(dest_net); 2852 return err; 2853 out_unregister: 2854 if (ops->newlink) { 2855 LIST_HEAD(list_kill); 2856 2857 ops->dellink(dev, &list_kill); 2858 unregister_netdevice_many(&list_kill); 2859 } else { 2860 unregister_netdevice(dev); 2861 } 2862 goto out; 2863 } 2864 } 2865 2866 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh, 2867 struct netlink_ext_ack *extack) 2868 { 2869 struct net *net = sock_net(skb->sk); 2870 struct net *tgt_net = net; 2871 struct ifinfomsg *ifm; 2872 char ifname[IFNAMSIZ]; 2873 struct nlattr *tb[IFLA_MAX+1]; 2874 struct net_device *dev = NULL; 2875 struct sk_buff *nskb; 2876 int netnsid = -1; 2877 int err; 2878 u32 ext_filter_mask = 0; 2879 2880 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack); 2881 if (err < 0) 2882 return err; 2883 2884 if (tb[IFLA_IF_NETNSID]) { 2885 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]); 2886 tgt_net = get_target_net(skb, netnsid); 2887 if (IS_ERR(tgt_net)) 2888 return PTR_ERR(tgt_net); 2889 } 2890 2891 if (tb[IFLA_IFNAME]) 2892 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2893 2894 if (tb[IFLA_EXT_MASK]) 2895 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2896 2897 err = -EINVAL; 2898 ifm = nlmsg_data(nlh); 2899 if (ifm->ifi_index > 0) 2900 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 2901 else if (tb[IFLA_IFNAME]) 2902 dev = __dev_get_by_name(tgt_net, ifname); 2903 else 2904 goto out; 2905 2906 err = -ENODEV; 2907 if (dev == NULL) 2908 goto out; 2909 2910 err = -ENOBUFS; 2911 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2912 if (nskb == NULL) 2913 goto out; 2914 2915 err = rtnl_fill_ifinfo(nskb, dev, net, 2916 RTM_NEWLINK, NETLINK_CB(skb).portid, 2917 nlh->nlmsg_seq, 0, 0, ext_filter_mask, 2918 0, NULL, netnsid); 2919 if (err < 0) { 2920 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2921 WARN_ON(err == -EMSGSIZE); 2922 kfree_skb(nskb); 2923 } else 2924 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2925 out: 2926 if (netnsid >= 0) 2927 put_net(tgt_net); 2928 2929 return err; 2930 } 2931 2932 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2933 { 2934 struct net *net = sock_net(skb->sk); 2935 struct net_device *dev; 2936 struct nlattr *tb[IFLA_MAX+1]; 2937 u32 ext_filter_mask = 0; 2938 u16 min_ifinfo_dump_size = 0; 2939 int hdrlen; 2940 2941 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2942 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2943 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2944 2945 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) { 2946 if (tb[IFLA_EXT_MASK]) 2947 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2948 } 2949 2950 if (!ext_filter_mask) 2951 return NLMSG_GOODSIZE; 2952 /* 2953 * traverse the list of net devices and compute the minimum 2954 * buffer size based upon the filter mask. 2955 */ 2956 rcu_read_lock(); 2957 for_each_netdev_rcu(net, dev) { 2958 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2959 if_nlmsg_size(dev, 2960 ext_filter_mask)); 2961 } 2962 rcu_read_unlock(); 2963 2964 return nlmsg_total_size(min_ifinfo_dump_size); 2965 } 2966 2967 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2968 { 2969 int idx; 2970 int s_idx = cb->family; 2971 2972 if (s_idx == 0) 2973 s_idx = 1; 2974 2975 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2976 int type = cb->nlh->nlmsg_type-RTM_BASE; 2977 struct rtnl_link *handlers; 2978 rtnl_dumpit_func dumpit; 2979 2980 if (idx < s_idx || idx == PF_PACKET) 2981 continue; 2982 2983 handlers = rtnl_dereference(rtnl_msg_handlers[idx]); 2984 if (!handlers) 2985 continue; 2986 2987 dumpit = READ_ONCE(handlers[type].dumpit); 2988 if (!dumpit) 2989 continue; 2990 2991 if (idx > s_idx) { 2992 memset(&cb->args[0], 0, sizeof(cb->args)); 2993 cb->prev_seq = 0; 2994 cb->seq = 0; 2995 } 2996 if (dumpit(skb, cb)) 2997 break; 2998 } 2999 cb->family = idx; 3000 3001 return skb->len; 3002 } 3003 3004 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 3005 unsigned int change, 3006 u32 event, gfp_t flags, int *new_nsid) 3007 { 3008 struct net *net = dev_net(dev); 3009 struct sk_buff *skb; 3010 int err = -ENOBUFS; 3011 size_t if_info_size; 3012 3013 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 3014 if (skb == NULL) 3015 goto errout; 3016 3017 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev), 3018 type, 0, 0, change, 0, 0, event, 3019 new_nsid, -1); 3020 if (err < 0) { 3021 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 3022 WARN_ON(err == -EMSGSIZE); 3023 kfree_skb(skb); 3024 goto errout; 3025 } 3026 return skb; 3027 errout: 3028 if (err < 0) 3029 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3030 return NULL; 3031 } 3032 3033 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 3034 { 3035 struct net *net = dev_net(dev); 3036 3037 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 3038 } 3039 3040 static void rtmsg_ifinfo_event(int type, struct net_device *dev, 3041 unsigned int change, u32 event, 3042 gfp_t flags, int *new_nsid) 3043 { 3044 struct sk_buff *skb; 3045 3046 if (dev->reg_state != NETREG_REGISTERED) 3047 return; 3048 3049 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid); 3050 if (skb) 3051 rtmsg_ifinfo_send(skb, dev, flags); 3052 } 3053 3054 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 3055 gfp_t flags) 3056 { 3057 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, NULL); 3058 } 3059 3060 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 3061 gfp_t flags, int *new_nsid) 3062 { 3063 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 3064 new_nsid); 3065 } 3066 3067 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 3068 struct net_device *dev, 3069 u8 *addr, u16 vid, u32 pid, u32 seq, 3070 int type, unsigned int flags, 3071 int nlflags, u16 ndm_state) 3072 { 3073 struct nlmsghdr *nlh; 3074 struct ndmsg *ndm; 3075 3076 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 3077 if (!nlh) 3078 return -EMSGSIZE; 3079 3080 ndm = nlmsg_data(nlh); 3081 ndm->ndm_family = AF_BRIDGE; 3082 ndm->ndm_pad1 = 0; 3083 ndm->ndm_pad2 = 0; 3084 ndm->ndm_flags = flags; 3085 ndm->ndm_type = 0; 3086 ndm->ndm_ifindex = dev->ifindex; 3087 ndm->ndm_state = ndm_state; 3088 3089 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 3090 goto nla_put_failure; 3091 if (vid) 3092 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 3093 goto nla_put_failure; 3094 3095 nlmsg_end(skb, nlh); 3096 return 0; 3097 3098 nla_put_failure: 3099 nlmsg_cancel(skb, nlh); 3100 return -EMSGSIZE; 3101 } 3102 3103 static inline size_t rtnl_fdb_nlmsg_size(void) 3104 { 3105 return NLMSG_ALIGN(sizeof(struct ndmsg)) + 3106 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */ 3107 nla_total_size(sizeof(u16)) + /* NDA_VLAN */ 3108 0; 3109 } 3110 3111 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 3112 u16 ndm_state) 3113 { 3114 struct net *net = dev_net(dev); 3115 struct sk_buff *skb; 3116 int err = -ENOBUFS; 3117 3118 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 3119 if (!skb) 3120 goto errout; 3121 3122 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 3123 0, 0, type, NTF_SELF, 0, ndm_state); 3124 if (err < 0) { 3125 kfree_skb(skb); 3126 goto errout; 3127 } 3128 3129 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 3130 return; 3131 errout: 3132 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 3133 } 3134 3135 /** 3136 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 3137 */ 3138 int ndo_dflt_fdb_add(struct ndmsg *ndm, 3139 struct nlattr *tb[], 3140 struct net_device *dev, 3141 const unsigned char *addr, u16 vid, 3142 u16 flags) 3143 { 3144 int err = -EINVAL; 3145 3146 /* If aging addresses are supported device will need to 3147 * implement its own handler for this. 3148 */ 3149 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 3150 pr_info("%s: FDB only supports static addresses\n", dev->name); 3151 return err; 3152 } 3153 3154 if (vid) { 3155 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 3156 return err; 3157 } 3158 3159 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 3160 err = dev_uc_add_excl(dev, addr); 3161 else if (is_multicast_ether_addr(addr)) 3162 err = dev_mc_add_excl(dev, addr); 3163 3164 /* Only return duplicate errors if NLM_F_EXCL is set */ 3165 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 3166 err = 0; 3167 3168 return err; 3169 } 3170 EXPORT_SYMBOL(ndo_dflt_fdb_add); 3171 3172 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid, 3173 struct netlink_ext_ack *extack) 3174 { 3175 u16 vid = 0; 3176 3177 if (vlan_attr) { 3178 if (nla_len(vlan_attr) != sizeof(u16)) { 3179 NL_SET_ERR_MSG(extack, "invalid vlan attribute size"); 3180 return -EINVAL; 3181 } 3182 3183 vid = nla_get_u16(vlan_attr); 3184 3185 if (!vid || vid >= VLAN_VID_MASK) { 3186 NL_SET_ERR_MSG(extack, "invalid vlan id"); 3187 return -EINVAL; 3188 } 3189 } 3190 *p_vid = vid; 3191 return 0; 3192 } 3193 3194 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, 3195 struct netlink_ext_ack *extack) 3196 { 3197 struct net *net = sock_net(skb->sk); 3198 struct ndmsg *ndm; 3199 struct nlattr *tb[NDA_MAX+1]; 3200 struct net_device *dev; 3201 u8 *addr; 3202 u16 vid; 3203 int err; 3204 3205 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack); 3206 if (err < 0) 3207 return err; 3208 3209 ndm = nlmsg_data(nlh); 3210 if (ndm->ndm_ifindex == 0) { 3211 NL_SET_ERR_MSG(extack, "invalid ifindex"); 3212 return -EINVAL; 3213 } 3214 3215 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 3216 if (dev == NULL) { 3217 NL_SET_ERR_MSG(extack, "unknown ifindex"); 3218 return -ENODEV; 3219 } 3220 3221 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 3222 NL_SET_ERR_MSG(extack, "invalid address"); 3223 return -EINVAL; 3224 } 3225 3226 addr = nla_data(tb[NDA_LLADDR]); 3227 3228 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 3229 if (err) 3230 return err; 3231 3232 err = -EOPNOTSUPP; 3233 3234 /* Support fdb on master device the net/bridge default case */ 3235 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 3236 (dev->priv_flags & IFF_BRIDGE_PORT)) { 3237 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3238 const struct net_device_ops *ops = br_dev->netdev_ops; 3239 3240 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 3241 nlh->nlmsg_flags); 3242 if (err) 3243 goto out; 3244 else 3245 ndm->ndm_flags &= ~NTF_MASTER; 3246 } 3247 3248 /* Embedded bridge, macvlan, and any other device support */ 3249 if ((ndm->ndm_flags & NTF_SELF)) { 3250 if (dev->netdev_ops->ndo_fdb_add) 3251 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 3252 vid, 3253 nlh->nlmsg_flags); 3254 else 3255 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 3256 nlh->nlmsg_flags); 3257 3258 if (!err) { 3259 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 3260 ndm->ndm_state); 3261 ndm->ndm_flags &= ~NTF_SELF; 3262 } 3263 } 3264 out: 3265 return err; 3266 } 3267 3268 /** 3269 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 3270 */ 3271 int ndo_dflt_fdb_del(struct ndmsg *ndm, 3272 struct nlattr *tb[], 3273 struct net_device *dev, 3274 const unsigned char *addr, u16 vid) 3275 { 3276 int err = -EINVAL; 3277 3278 /* If aging addresses are supported device will need to 3279 * implement its own handler for this. 3280 */ 3281 if (!(ndm->ndm_state & NUD_PERMANENT)) { 3282 pr_info("%s: FDB only supports static addresses\n", dev->name); 3283 return err; 3284 } 3285 3286 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 3287 err = dev_uc_del(dev, addr); 3288 else if (is_multicast_ether_addr(addr)) 3289 err = dev_mc_del(dev, addr); 3290 3291 return err; 3292 } 3293 EXPORT_SYMBOL(ndo_dflt_fdb_del); 3294 3295 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, 3296 struct netlink_ext_ack *extack) 3297 { 3298 struct net *net = sock_net(skb->sk); 3299 struct ndmsg *ndm; 3300 struct nlattr *tb[NDA_MAX+1]; 3301 struct net_device *dev; 3302 int err = -EINVAL; 3303 __u8 *addr; 3304 u16 vid; 3305 3306 if (!netlink_capable(skb, CAP_NET_ADMIN)) 3307 return -EPERM; 3308 3309 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack); 3310 if (err < 0) 3311 return err; 3312 3313 ndm = nlmsg_data(nlh); 3314 if (ndm->ndm_ifindex == 0) { 3315 NL_SET_ERR_MSG(extack, "invalid ifindex"); 3316 return -EINVAL; 3317 } 3318 3319 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 3320 if (dev == NULL) { 3321 NL_SET_ERR_MSG(extack, "unknown ifindex"); 3322 return -ENODEV; 3323 } 3324 3325 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 3326 NL_SET_ERR_MSG(extack, "invalid address"); 3327 return -EINVAL; 3328 } 3329 3330 addr = nla_data(tb[NDA_LLADDR]); 3331 3332 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 3333 if (err) 3334 return err; 3335 3336 err = -EOPNOTSUPP; 3337 3338 /* Support fdb on master device the net/bridge default case */ 3339 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 3340 (dev->priv_flags & IFF_BRIDGE_PORT)) { 3341 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3342 const struct net_device_ops *ops = br_dev->netdev_ops; 3343 3344 if (ops->ndo_fdb_del) 3345 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 3346 3347 if (err) 3348 goto out; 3349 else 3350 ndm->ndm_flags &= ~NTF_MASTER; 3351 } 3352 3353 /* Embedded bridge, macvlan, and any other device support */ 3354 if (ndm->ndm_flags & NTF_SELF) { 3355 if (dev->netdev_ops->ndo_fdb_del) 3356 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 3357 vid); 3358 else 3359 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 3360 3361 if (!err) { 3362 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 3363 ndm->ndm_state); 3364 ndm->ndm_flags &= ~NTF_SELF; 3365 } 3366 } 3367 out: 3368 return err; 3369 } 3370 3371 static int nlmsg_populate_fdb(struct sk_buff *skb, 3372 struct netlink_callback *cb, 3373 struct net_device *dev, 3374 int *idx, 3375 struct netdev_hw_addr_list *list) 3376 { 3377 struct netdev_hw_addr *ha; 3378 int err; 3379 u32 portid, seq; 3380 3381 portid = NETLINK_CB(cb->skb).portid; 3382 seq = cb->nlh->nlmsg_seq; 3383 3384 list_for_each_entry(ha, &list->list, list) { 3385 if (*idx < cb->args[2]) 3386 goto skip; 3387 3388 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 3389 portid, seq, 3390 RTM_NEWNEIGH, NTF_SELF, 3391 NLM_F_MULTI, NUD_PERMANENT); 3392 if (err < 0) 3393 return err; 3394 skip: 3395 *idx += 1; 3396 } 3397 return 0; 3398 } 3399 3400 /** 3401 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 3402 * @nlh: netlink message header 3403 * @dev: netdevice 3404 * 3405 * Default netdevice operation to dump the existing unicast address list. 3406 * Returns number of addresses from list put in skb. 3407 */ 3408 int ndo_dflt_fdb_dump(struct sk_buff *skb, 3409 struct netlink_callback *cb, 3410 struct net_device *dev, 3411 struct net_device *filter_dev, 3412 int *idx) 3413 { 3414 int err; 3415 3416 netif_addr_lock_bh(dev); 3417 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc); 3418 if (err) 3419 goto out; 3420 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc); 3421 out: 3422 netif_addr_unlock_bh(dev); 3423 return err; 3424 } 3425 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 3426 3427 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 3428 { 3429 struct net_device *dev; 3430 struct nlattr *tb[IFLA_MAX+1]; 3431 struct net_device *br_dev = NULL; 3432 const struct net_device_ops *ops = NULL; 3433 const struct net_device_ops *cops = NULL; 3434 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 3435 struct net *net = sock_net(skb->sk); 3436 struct hlist_head *head; 3437 int brport_idx = 0; 3438 int br_idx = 0; 3439 int h, s_h; 3440 int idx = 0, s_idx; 3441 int err = 0; 3442 int fidx = 0; 3443 3444 err = nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, 3445 IFLA_MAX, ifla_policy, NULL); 3446 if (err < 0) { 3447 return -EINVAL; 3448 } else if (err == 0) { 3449 if (tb[IFLA_MASTER]) 3450 br_idx = nla_get_u32(tb[IFLA_MASTER]); 3451 } 3452 3453 brport_idx = ifm->ifi_index; 3454 3455 if (br_idx) { 3456 br_dev = __dev_get_by_index(net, br_idx); 3457 if (!br_dev) 3458 return -ENODEV; 3459 3460 ops = br_dev->netdev_ops; 3461 } 3462 3463 s_h = cb->args[0]; 3464 s_idx = cb->args[1]; 3465 3466 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3467 idx = 0; 3468 head = &net->dev_index_head[h]; 3469 hlist_for_each_entry(dev, head, index_hlist) { 3470 3471 if (brport_idx && (dev->ifindex != brport_idx)) 3472 continue; 3473 3474 if (!br_idx) { /* user did not specify a specific bridge */ 3475 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3476 br_dev = netdev_master_upper_dev_get(dev); 3477 cops = br_dev->netdev_ops; 3478 } 3479 } else { 3480 if (dev != br_dev && 3481 !(dev->priv_flags & IFF_BRIDGE_PORT)) 3482 continue; 3483 3484 if (br_dev != netdev_master_upper_dev_get(dev) && 3485 !(dev->priv_flags & IFF_EBRIDGE)) 3486 continue; 3487 cops = ops; 3488 } 3489 3490 if (idx < s_idx) 3491 goto cont; 3492 3493 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3494 if (cops && cops->ndo_fdb_dump) { 3495 err = cops->ndo_fdb_dump(skb, cb, 3496 br_dev, dev, 3497 &fidx); 3498 if (err == -EMSGSIZE) 3499 goto out; 3500 } 3501 } 3502 3503 if (dev->netdev_ops->ndo_fdb_dump) 3504 err = dev->netdev_ops->ndo_fdb_dump(skb, cb, 3505 dev, NULL, 3506 &fidx); 3507 else 3508 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, 3509 &fidx); 3510 if (err == -EMSGSIZE) 3511 goto out; 3512 3513 cops = NULL; 3514 3515 /* reset fdb offset to 0 for rest of the interfaces */ 3516 cb->args[2] = 0; 3517 fidx = 0; 3518 cont: 3519 idx++; 3520 } 3521 } 3522 3523 out: 3524 cb->args[0] = h; 3525 cb->args[1] = idx; 3526 cb->args[2] = fidx; 3527 3528 return skb->len; 3529 } 3530 3531 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 3532 unsigned int attrnum, unsigned int flag) 3533 { 3534 if (mask & flag) 3535 return nla_put_u8(skb, attrnum, !!(flags & flag)); 3536 return 0; 3537 } 3538 3539 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 3540 struct net_device *dev, u16 mode, 3541 u32 flags, u32 mask, int nlflags, 3542 u32 filter_mask, 3543 int (*vlan_fill)(struct sk_buff *skb, 3544 struct net_device *dev, 3545 u32 filter_mask)) 3546 { 3547 struct nlmsghdr *nlh; 3548 struct ifinfomsg *ifm; 3549 struct nlattr *br_afspec; 3550 struct nlattr *protinfo; 3551 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 3552 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3553 int err = 0; 3554 3555 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 3556 if (nlh == NULL) 3557 return -EMSGSIZE; 3558 3559 ifm = nlmsg_data(nlh); 3560 ifm->ifi_family = AF_BRIDGE; 3561 ifm->__ifi_pad = 0; 3562 ifm->ifi_type = dev->type; 3563 ifm->ifi_index = dev->ifindex; 3564 ifm->ifi_flags = dev_get_flags(dev); 3565 ifm->ifi_change = 0; 3566 3567 3568 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 3569 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 3570 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 3571 (br_dev && 3572 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 3573 (dev->addr_len && 3574 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 3575 (dev->ifindex != dev_get_iflink(dev) && 3576 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 3577 goto nla_put_failure; 3578 3579 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 3580 if (!br_afspec) 3581 goto nla_put_failure; 3582 3583 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 3584 nla_nest_cancel(skb, br_afspec); 3585 goto nla_put_failure; 3586 } 3587 3588 if (mode != BRIDGE_MODE_UNDEF) { 3589 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 3590 nla_nest_cancel(skb, br_afspec); 3591 goto nla_put_failure; 3592 } 3593 } 3594 if (vlan_fill) { 3595 err = vlan_fill(skb, dev, filter_mask); 3596 if (err) { 3597 nla_nest_cancel(skb, br_afspec); 3598 goto nla_put_failure; 3599 } 3600 } 3601 nla_nest_end(skb, br_afspec); 3602 3603 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 3604 if (!protinfo) 3605 goto nla_put_failure; 3606 3607 if (brport_nla_put_flag(skb, flags, mask, 3608 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 3609 brport_nla_put_flag(skb, flags, mask, 3610 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 3611 brport_nla_put_flag(skb, flags, mask, 3612 IFLA_BRPORT_FAST_LEAVE, 3613 BR_MULTICAST_FAST_LEAVE) || 3614 brport_nla_put_flag(skb, flags, mask, 3615 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 3616 brport_nla_put_flag(skb, flags, mask, 3617 IFLA_BRPORT_LEARNING, BR_LEARNING) || 3618 brport_nla_put_flag(skb, flags, mask, 3619 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 3620 brport_nla_put_flag(skb, flags, mask, 3621 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3622 brport_nla_put_flag(skb, flags, mask, 3623 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3624 nla_nest_cancel(skb, protinfo); 3625 goto nla_put_failure; 3626 } 3627 3628 nla_nest_end(skb, protinfo); 3629 3630 nlmsg_end(skb, nlh); 3631 return 0; 3632 nla_put_failure: 3633 nlmsg_cancel(skb, nlh); 3634 return err ? err : -EMSGSIZE; 3635 } 3636 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3637 3638 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3639 { 3640 struct net *net = sock_net(skb->sk); 3641 struct net_device *dev; 3642 int idx = 0; 3643 u32 portid = NETLINK_CB(cb->skb).portid; 3644 u32 seq = cb->nlh->nlmsg_seq; 3645 u32 filter_mask = 0; 3646 int err; 3647 3648 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3649 struct nlattr *extfilt; 3650 3651 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3652 IFLA_EXT_MASK); 3653 if (extfilt) { 3654 if (nla_len(extfilt) < sizeof(filter_mask)) 3655 return -EINVAL; 3656 3657 filter_mask = nla_get_u32(extfilt); 3658 } 3659 } 3660 3661 rcu_read_lock(); 3662 for_each_netdev_rcu(net, dev) { 3663 const struct net_device_ops *ops = dev->netdev_ops; 3664 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3665 3666 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3667 if (idx >= cb->args[0]) { 3668 err = br_dev->netdev_ops->ndo_bridge_getlink( 3669 skb, portid, seq, dev, 3670 filter_mask, NLM_F_MULTI); 3671 if (err < 0 && err != -EOPNOTSUPP) { 3672 if (likely(skb->len)) 3673 break; 3674 3675 goto out_err; 3676 } 3677 } 3678 idx++; 3679 } 3680 3681 if (ops->ndo_bridge_getlink) { 3682 if (idx >= cb->args[0]) { 3683 err = ops->ndo_bridge_getlink(skb, portid, 3684 seq, dev, 3685 filter_mask, 3686 NLM_F_MULTI); 3687 if (err < 0 && err != -EOPNOTSUPP) { 3688 if (likely(skb->len)) 3689 break; 3690 3691 goto out_err; 3692 } 3693 } 3694 idx++; 3695 } 3696 } 3697 err = skb->len; 3698 out_err: 3699 rcu_read_unlock(); 3700 cb->args[0] = idx; 3701 3702 return err; 3703 } 3704 3705 static inline size_t bridge_nlmsg_size(void) 3706 { 3707 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3708 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3709 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3710 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3711 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3712 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3713 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3714 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3715 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3716 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3717 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3718 } 3719 3720 static int rtnl_bridge_notify(struct net_device *dev) 3721 { 3722 struct net *net = dev_net(dev); 3723 struct sk_buff *skb; 3724 int err = -EOPNOTSUPP; 3725 3726 if (!dev->netdev_ops->ndo_bridge_getlink) 3727 return 0; 3728 3729 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3730 if (!skb) { 3731 err = -ENOMEM; 3732 goto errout; 3733 } 3734 3735 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3736 if (err < 0) 3737 goto errout; 3738 3739 if (!skb->len) 3740 goto errout; 3741 3742 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3743 return 0; 3744 errout: 3745 WARN_ON(err == -EMSGSIZE); 3746 kfree_skb(skb); 3747 if (err) 3748 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3749 return err; 3750 } 3751 3752 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3753 struct netlink_ext_ack *extack) 3754 { 3755 struct net *net = sock_net(skb->sk); 3756 struct ifinfomsg *ifm; 3757 struct net_device *dev; 3758 struct nlattr *br_spec, *attr = NULL; 3759 int rem, err = -EOPNOTSUPP; 3760 u16 flags = 0; 3761 bool have_flags = false; 3762 3763 if (nlmsg_len(nlh) < sizeof(*ifm)) 3764 return -EINVAL; 3765 3766 ifm = nlmsg_data(nlh); 3767 if (ifm->ifi_family != AF_BRIDGE) 3768 return -EPFNOSUPPORT; 3769 3770 dev = __dev_get_by_index(net, ifm->ifi_index); 3771 if (!dev) { 3772 NL_SET_ERR_MSG(extack, "unknown ifindex"); 3773 return -ENODEV; 3774 } 3775 3776 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3777 if (br_spec) { 3778 nla_for_each_nested(attr, br_spec, rem) { 3779 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3780 if (nla_len(attr) < sizeof(flags)) 3781 return -EINVAL; 3782 3783 have_flags = true; 3784 flags = nla_get_u16(attr); 3785 break; 3786 } 3787 } 3788 } 3789 3790 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3791 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3792 3793 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3794 err = -EOPNOTSUPP; 3795 goto out; 3796 } 3797 3798 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3799 if (err) 3800 goto out; 3801 3802 flags &= ~BRIDGE_FLAGS_MASTER; 3803 } 3804 3805 if ((flags & BRIDGE_FLAGS_SELF)) { 3806 if (!dev->netdev_ops->ndo_bridge_setlink) 3807 err = -EOPNOTSUPP; 3808 else 3809 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3810 flags); 3811 if (!err) { 3812 flags &= ~BRIDGE_FLAGS_SELF; 3813 3814 /* Generate event to notify upper layer of bridge 3815 * change 3816 */ 3817 err = rtnl_bridge_notify(dev); 3818 } 3819 } 3820 3821 if (have_flags) 3822 memcpy(nla_data(attr), &flags, sizeof(flags)); 3823 out: 3824 return err; 3825 } 3826 3827 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 3828 struct netlink_ext_ack *extack) 3829 { 3830 struct net *net = sock_net(skb->sk); 3831 struct ifinfomsg *ifm; 3832 struct net_device *dev; 3833 struct nlattr *br_spec, *attr = NULL; 3834 int rem, err = -EOPNOTSUPP; 3835 u16 flags = 0; 3836 bool have_flags = false; 3837 3838 if (nlmsg_len(nlh) < sizeof(*ifm)) 3839 return -EINVAL; 3840 3841 ifm = nlmsg_data(nlh); 3842 if (ifm->ifi_family != AF_BRIDGE) 3843 return -EPFNOSUPPORT; 3844 3845 dev = __dev_get_by_index(net, ifm->ifi_index); 3846 if (!dev) { 3847 NL_SET_ERR_MSG(extack, "unknown ifindex"); 3848 return -ENODEV; 3849 } 3850 3851 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3852 if (br_spec) { 3853 nla_for_each_nested(attr, br_spec, rem) { 3854 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3855 if (nla_len(attr) < sizeof(flags)) 3856 return -EINVAL; 3857 3858 have_flags = true; 3859 flags = nla_get_u16(attr); 3860 break; 3861 } 3862 } 3863 } 3864 3865 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3866 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3867 3868 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3869 err = -EOPNOTSUPP; 3870 goto out; 3871 } 3872 3873 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3874 if (err) 3875 goto out; 3876 3877 flags &= ~BRIDGE_FLAGS_MASTER; 3878 } 3879 3880 if ((flags & BRIDGE_FLAGS_SELF)) { 3881 if (!dev->netdev_ops->ndo_bridge_dellink) 3882 err = -EOPNOTSUPP; 3883 else 3884 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3885 flags); 3886 3887 if (!err) { 3888 flags &= ~BRIDGE_FLAGS_SELF; 3889 3890 /* Generate event to notify upper layer of bridge 3891 * change 3892 */ 3893 err = rtnl_bridge_notify(dev); 3894 } 3895 } 3896 3897 if (have_flags) 3898 memcpy(nla_data(attr), &flags, sizeof(flags)); 3899 out: 3900 return err; 3901 } 3902 3903 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr) 3904 { 3905 return (mask & IFLA_STATS_FILTER_BIT(attrid)) && 3906 (!idxattr || idxattr == attrid); 3907 } 3908 3909 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1) 3910 static int rtnl_get_offload_stats_attr_size(int attr_id) 3911 { 3912 switch (attr_id) { 3913 case IFLA_OFFLOAD_XSTATS_CPU_HIT: 3914 return sizeof(struct rtnl_link_stats64); 3915 } 3916 3917 return 0; 3918 } 3919 3920 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev, 3921 int *prividx) 3922 { 3923 struct nlattr *attr = NULL; 3924 int attr_id, size; 3925 void *attr_data; 3926 int err; 3927 3928 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 3929 dev->netdev_ops->ndo_get_offload_stats)) 3930 return -ENODATA; 3931 3932 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 3933 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 3934 if (attr_id < *prividx) 3935 continue; 3936 3937 size = rtnl_get_offload_stats_attr_size(attr_id); 3938 if (!size) 3939 continue; 3940 3941 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 3942 continue; 3943 3944 attr = nla_reserve_64bit(skb, attr_id, size, 3945 IFLA_OFFLOAD_XSTATS_UNSPEC); 3946 if (!attr) 3947 goto nla_put_failure; 3948 3949 attr_data = nla_data(attr); 3950 memset(attr_data, 0, size); 3951 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, 3952 attr_data); 3953 if (err) 3954 goto get_offload_stats_failure; 3955 } 3956 3957 if (!attr) 3958 return -ENODATA; 3959 3960 *prividx = 0; 3961 return 0; 3962 3963 nla_put_failure: 3964 err = -EMSGSIZE; 3965 get_offload_stats_failure: 3966 *prividx = attr_id; 3967 return err; 3968 } 3969 3970 static int rtnl_get_offload_stats_size(const struct net_device *dev) 3971 { 3972 int nla_size = 0; 3973 int attr_id; 3974 int size; 3975 3976 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 3977 dev->netdev_ops->ndo_get_offload_stats)) 3978 return 0; 3979 3980 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 3981 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 3982 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 3983 continue; 3984 size = rtnl_get_offload_stats_attr_size(attr_id); 3985 nla_size += nla_total_size_64bit(size); 3986 } 3987 3988 if (nla_size != 0) 3989 nla_size += nla_total_size(0); 3990 3991 return nla_size; 3992 } 3993 3994 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, 3995 int type, u32 pid, u32 seq, u32 change, 3996 unsigned int flags, unsigned int filter_mask, 3997 int *idxattr, int *prividx) 3998 { 3999 struct if_stats_msg *ifsm; 4000 struct nlmsghdr *nlh; 4001 struct nlattr *attr; 4002 int s_prividx = *prividx; 4003 int err; 4004 4005 ASSERT_RTNL(); 4006 4007 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags); 4008 if (!nlh) 4009 return -EMSGSIZE; 4010 4011 ifsm = nlmsg_data(nlh); 4012 ifsm->family = PF_UNSPEC; 4013 ifsm->pad1 = 0; 4014 ifsm->pad2 = 0; 4015 ifsm->ifindex = dev->ifindex; 4016 ifsm->filter_mask = filter_mask; 4017 4018 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) { 4019 struct rtnl_link_stats64 *sp; 4020 4021 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64, 4022 sizeof(struct rtnl_link_stats64), 4023 IFLA_STATS_UNSPEC); 4024 if (!attr) 4025 goto nla_put_failure; 4026 4027 sp = nla_data(attr); 4028 dev_get_stats(dev, sp); 4029 } 4030 4031 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) { 4032 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 4033 4034 if (ops && ops->fill_linkxstats) { 4035 *idxattr = IFLA_STATS_LINK_XSTATS; 4036 attr = nla_nest_start(skb, 4037 IFLA_STATS_LINK_XSTATS); 4038 if (!attr) 4039 goto nla_put_failure; 4040 4041 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 4042 nla_nest_end(skb, attr); 4043 if (err) 4044 goto nla_put_failure; 4045 *idxattr = 0; 4046 } 4047 } 4048 4049 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 4050 *idxattr)) { 4051 const struct rtnl_link_ops *ops = NULL; 4052 const struct net_device *master; 4053 4054 master = netdev_master_upper_dev_get(dev); 4055 if (master) 4056 ops = master->rtnl_link_ops; 4057 if (ops && ops->fill_linkxstats) { 4058 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE; 4059 attr = nla_nest_start(skb, 4060 IFLA_STATS_LINK_XSTATS_SLAVE); 4061 if (!attr) 4062 goto nla_put_failure; 4063 4064 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 4065 nla_nest_end(skb, attr); 4066 if (err) 4067 goto nla_put_failure; 4068 *idxattr = 0; 4069 } 4070 } 4071 4072 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 4073 *idxattr)) { 4074 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS; 4075 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS); 4076 if (!attr) 4077 goto nla_put_failure; 4078 4079 err = rtnl_get_offload_stats(skb, dev, prividx); 4080 if (err == -ENODATA) 4081 nla_nest_cancel(skb, attr); 4082 else 4083 nla_nest_end(skb, attr); 4084 4085 if (err && err != -ENODATA) 4086 goto nla_put_failure; 4087 *idxattr = 0; 4088 } 4089 4090 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) { 4091 struct rtnl_af_ops *af_ops; 4092 4093 *idxattr = IFLA_STATS_AF_SPEC; 4094 attr = nla_nest_start(skb, IFLA_STATS_AF_SPEC); 4095 if (!attr) 4096 goto nla_put_failure; 4097 4098 rcu_read_lock(); 4099 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 4100 if (af_ops->fill_stats_af) { 4101 struct nlattr *af; 4102 int err; 4103 4104 af = nla_nest_start(skb, af_ops->family); 4105 if (!af) { 4106 rcu_read_unlock(); 4107 goto nla_put_failure; 4108 } 4109 err = af_ops->fill_stats_af(skb, dev); 4110 4111 if (err == -ENODATA) { 4112 nla_nest_cancel(skb, af); 4113 } else if (err < 0) { 4114 rcu_read_unlock(); 4115 goto nla_put_failure; 4116 } 4117 4118 nla_nest_end(skb, af); 4119 } 4120 } 4121 rcu_read_unlock(); 4122 4123 nla_nest_end(skb, attr); 4124 4125 *idxattr = 0; 4126 } 4127 4128 nlmsg_end(skb, nlh); 4129 4130 return 0; 4131 4132 nla_put_failure: 4133 /* not a multi message or no progress mean a real error */ 4134 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx) 4135 nlmsg_cancel(skb, nlh); 4136 else 4137 nlmsg_end(skb, nlh); 4138 4139 return -EMSGSIZE; 4140 } 4141 4142 static size_t if_nlmsg_stats_size(const struct net_device *dev, 4143 u32 filter_mask) 4144 { 4145 size_t size = 0; 4146 4147 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0)) 4148 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64)); 4149 4150 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) { 4151 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 4152 int attr = IFLA_STATS_LINK_XSTATS; 4153 4154 if (ops && ops->get_linkxstats_size) { 4155 size += nla_total_size(ops->get_linkxstats_size(dev, 4156 attr)); 4157 /* for IFLA_STATS_LINK_XSTATS */ 4158 size += nla_total_size(0); 4159 } 4160 } 4161 4162 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) { 4163 struct net_device *_dev = (struct net_device *)dev; 4164 const struct rtnl_link_ops *ops = NULL; 4165 const struct net_device *master; 4166 4167 /* netdev_master_upper_dev_get can't take const */ 4168 master = netdev_master_upper_dev_get(_dev); 4169 if (master) 4170 ops = master->rtnl_link_ops; 4171 if (ops && ops->get_linkxstats_size) { 4172 int attr = IFLA_STATS_LINK_XSTATS_SLAVE; 4173 4174 size += nla_total_size(ops->get_linkxstats_size(dev, 4175 attr)); 4176 /* for IFLA_STATS_LINK_XSTATS_SLAVE */ 4177 size += nla_total_size(0); 4178 } 4179 } 4180 4181 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) 4182 size += rtnl_get_offload_stats_size(dev); 4183 4184 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) { 4185 struct rtnl_af_ops *af_ops; 4186 4187 /* for IFLA_STATS_AF_SPEC */ 4188 size += nla_total_size(0); 4189 4190 rcu_read_lock(); 4191 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 4192 if (af_ops->get_stats_af_size) { 4193 size += nla_total_size( 4194 af_ops->get_stats_af_size(dev)); 4195 4196 /* for AF_* */ 4197 size += nla_total_size(0); 4198 } 4199 } 4200 rcu_read_unlock(); 4201 } 4202 4203 return size; 4204 } 4205 4206 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh, 4207 struct netlink_ext_ack *extack) 4208 { 4209 struct net *net = sock_net(skb->sk); 4210 struct net_device *dev = NULL; 4211 int idxattr = 0, prividx = 0; 4212 struct if_stats_msg *ifsm; 4213 struct sk_buff *nskb; 4214 u32 filter_mask; 4215 int err; 4216 4217 if (nlmsg_len(nlh) < sizeof(*ifsm)) 4218 return -EINVAL; 4219 4220 ifsm = nlmsg_data(nlh); 4221 if (ifsm->ifindex > 0) 4222 dev = __dev_get_by_index(net, ifsm->ifindex); 4223 else 4224 return -EINVAL; 4225 4226 if (!dev) 4227 return -ENODEV; 4228 4229 filter_mask = ifsm->filter_mask; 4230 if (!filter_mask) 4231 return -EINVAL; 4232 4233 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL); 4234 if (!nskb) 4235 return -ENOBUFS; 4236 4237 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS, 4238 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 4239 0, filter_mask, &idxattr, &prividx); 4240 if (err < 0) { 4241 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */ 4242 WARN_ON(err == -EMSGSIZE); 4243 kfree_skb(nskb); 4244 } else { 4245 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 4246 } 4247 4248 return err; 4249 } 4250 4251 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb) 4252 { 4253 int h, s_h, err, s_idx, s_idxattr, s_prividx; 4254 struct net *net = sock_net(skb->sk); 4255 unsigned int flags = NLM_F_MULTI; 4256 struct if_stats_msg *ifsm; 4257 struct hlist_head *head; 4258 struct net_device *dev; 4259 u32 filter_mask = 0; 4260 int idx = 0; 4261 4262 s_h = cb->args[0]; 4263 s_idx = cb->args[1]; 4264 s_idxattr = cb->args[2]; 4265 s_prividx = cb->args[3]; 4266 4267 cb->seq = net->dev_base_seq; 4268 4269 if (nlmsg_len(cb->nlh) < sizeof(*ifsm)) 4270 return -EINVAL; 4271 4272 ifsm = nlmsg_data(cb->nlh); 4273 filter_mask = ifsm->filter_mask; 4274 if (!filter_mask) 4275 return -EINVAL; 4276 4277 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4278 idx = 0; 4279 head = &net->dev_index_head[h]; 4280 hlist_for_each_entry(dev, head, index_hlist) { 4281 if (idx < s_idx) 4282 goto cont; 4283 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 4284 NETLINK_CB(cb->skb).portid, 4285 cb->nlh->nlmsg_seq, 0, 4286 flags, filter_mask, 4287 &s_idxattr, &s_prividx); 4288 /* If we ran out of room on the first message, 4289 * we're in trouble 4290 */ 4291 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 4292 4293 if (err < 0) 4294 goto out; 4295 s_prividx = 0; 4296 s_idxattr = 0; 4297 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4298 cont: 4299 idx++; 4300 } 4301 } 4302 out: 4303 cb->args[3] = s_prividx; 4304 cb->args[2] = s_idxattr; 4305 cb->args[1] = idx; 4306 cb->args[0] = h; 4307 4308 return skb->len; 4309 } 4310 4311 /* Process one rtnetlink message. */ 4312 4313 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 4314 struct netlink_ext_ack *extack) 4315 { 4316 struct net *net = sock_net(skb->sk); 4317 struct rtnl_link *handlers; 4318 int err = -EOPNOTSUPP; 4319 rtnl_doit_func doit; 4320 unsigned int flags; 4321 int kind; 4322 int family; 4323 int type; 4324 4325 type = nlh->nlmsg_type; 4326 if (type > RTM_MAX) 4327 return -EOPNOTSUPP; 4328 4329 type -= RTM_BASE; 4330 4331 /* All the messages must have at least 1 byte length */ 4332 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 4333 return 0; 4334 4335 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 4336 kind = type&3; 4337 4338 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 4339 return -EPERM; 4340 4341 if (family >= ARRAY_SIZE(rtnl_msg_handlers)) 4342 family = PF_UNSPEC; 4343 4344 rcu_read_lock(); 4345 handlers = rcu_dereference(rtnl_msg_handlers[family]); 4346 if (!handlers) { 4347 family = PF_UNSPEC; 4348 handlers = rcu_dereference(rtnl_msg_handlers[family]); 4349 } 4350 4351 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 4352 struct sock *rtnl; 4353 rtnl_dumpit_func dumpit; 4354 u16 min_dump_alloc = 0; 4355 4356 dumpit = READ_ONCE(handlers[type].dumpit); 4357 if (!dumpit) { 4358 family = PF_UNSPEC; 4359 handlers = rcu_dereference(rtnl_msg_handlers[PF_UNSPEC]); 4360 if (!handlers) 4361 goto err_unlock; 4362 4363 dumpit = READ_ONCE(handlers[type].dumpit); 4364 if (!dumpit) 4365 goto err_unlock; 4366 } 4367 4368 refcount_inc(&rtnl_msg_handlers_ref[family]); 4369 4370 if (type == RTM_GETLINK - RTM_BASE) 4371 min_dump_alloc = rtnl_calcit(skb, nlh); 4372 4373 rcu_read_unlock(); 4374 4375 rtnl = net->rtnl; 4376 { 4377 struct netlink_dump_control c = { 4378 .dump = dumpit, 4379 .min_dump_alloc = min_dump_alloc, 4380 }; 4381 err = netlink_dump_start(rtnl, skb, nlh, &c); 4382 } 4383 refcount_dec(&rtnl_msg_handlers_ref[family]); 4384 return err; 4385 } 4386 4387 doit = READ_ONCE(handlers[type].doit); 4388 if (!doit) { 4389 family = PF_UNSPEC; 4390 handlers = rcu_dereference(rtnl_msg_handlers[family]); 4391 } 4392 4393 flags = READ_ONCE(handlers[type].flags); 4394 if (flags & RTNL_FLAG_DOIT_UNLOCKED) { 4395 refcount_inc(&rtnl_msg_handlers_ref[family]); 4396 doit = READ_ONCE(handlers[type].doit); 4397 rcu_read_unlock(); 4398 if (doit) 4399 err = doit(skb, nlh, extack); 4400 refcount_dec(&rtnl_msg_handlers_ref[family]); 4401 return err; 4402 } 4403 4404 rcu_read_unlock(); 4405 4406 rtnl_lock(); 4407 handlers = rtnl_dereference(rtnl_msg_handlers[family]); 4408 if (handlers) { 4409 doit = READ_ONCE(handlers[type].doit); 4410 if (doit) 4411 err = doit(skb, nlh, extack); 4412 } 4413 rtnl_unlock(); 4414 return err; 4415 4416 err_unlock: 4417 rcu_read_unlock(); 4418 return -EOPNOTSUPP; 4419 } 4420 4421 static void rtnetlink_rcv(struct sk_buff *skb) 4422 { 4423 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 4424 } 4425 4426 static int rtnetlink_bind(struct net *net, int group) 4427 { 4428 switch (group) { 4429 case RTNLGRP_IPV4_MROUTE_R: 4430 case RTNLGRP_IPV6_MROUTE_R: 4431 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4432 return -EPERM; 4433 break; 4434 } 4435 return 0; 4436 } 4437 4438 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 4439 { 4440 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4441 4442 switch (event) { 4443 case NETDEV_REBOOT: 4444 case NETDEV_CHANGEMTU: 4445 case NETDEV_CHANGEADDR: 4446 case NETDEV_CHANGENAME: 4447 case NETDEV_FEAT_CHANGE: 4448 case NETDEV_BONDING_FAILOVER: 4449 case NETDEV_POST_TYPE_CHANGE: 4450 case NETDEV_NOTIFY_PEERS: 4451 case NETDEV_CHANGEUPPER: 4452 case NETDEV_RESEND_IGMP: 4453 case NETDEV_CHANGEINFODATA: 4454 case NETDEV_CHANGELOWERSTATE: 4455 case NETDEV_CHANGE_TX_QUEUE_LEN: 4456 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event), 4457 GFP_KERNEL, NULL); 4458 break; 4459 default: 4460 break; 4461 } 4462 return NOTIFY_DONE; 4463 } 4464 4465 static struct notifier_block rtnetlink_dev_notifier = { 4466 .notifier_call = rtnetlink_event, 4467 }; 4468 4469 4470 static int __net_init rtnetlink_net_init(struct net *net) 4471 { 4472 struct sock *sk; 4473 struct netlink_kernel_cfg cfg = { 4474 .groups = RTNLGRP_MAX, 4475 .input = rtnetlink_rcv, 4476 .cb_mutex = &rtnl_mutex, 4477 .flags = NL_CFG_F_NONROOT_RECV, 4478 .bind = rtnetlink_bind, 4479 }; 4480 4481 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 4482 if (!sk) 4483 return -ENOMEM; 4484 net->rtnl = sk; 4485 return 0; 4486 } 4487 4488 static void __net_exit rtnetlink_net_exit(struct net *net) 4489 { 4490 netlink_kernel_release(net->rtnl); 4491 net->rtnl = NULL; 4492 } 4493 4494 static struct pernet_operations rtnetlink_net_ops = { 4495 .init = rtnetlink_net_init, 4496 .exit = rtnetlink_net_exit, 4497 }; 4498 4499 void __init rtnetlink_init(void) 4500 { 4501 int i; 4502 4503 for (i = 0; i < ARRAY_SIZE(rtnl_msg_handlers_ref); i++) 4504 refcount_set(&rtnl_msg_handlers_ref[i], 1); 4505 4506 if (register_pernet_subsys(&rtnetlink_net_ops)) 4507 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 4508 4509 register_netdevice_notifier(&rtnetlink_dev_notifier); 4510 4511 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 4512 rtnl_dump_ifinfo, 0); 4513 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0); 4514 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0); 4515 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0); 4516 4517 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0); 4518 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0); 4519 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0); 4520 4521 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0); 4522 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0); 4523 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, 0); 4524 4525 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0); 4526 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0); 4527 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0); 4528 4529 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump, 4530 0); 4531 } 4532