1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Routing netlink socket interface: protocol independent part. 8 * 9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 10 * 11 * Fixes: 12 * Vitaly E. Lavrov RTA_OK arithmetic was wrong. 13 */ 14 15 #include <linux/bitops.h> 16 #include <linux/errno.h> 17 #include <linux/module.h> 18 #include <linux/types.h> 19 #include <linux/socket.h> 20 #include <linux/kernel.h> 21 #include <linux/timer.h> 22 #include <linux/string.h> 23 #include <linux/sockios.h> 24 #include <linux/net.h> 25 #include <linux/fcntl.h> 26 #include <linux/mm.h> 27 #include <linux/slab.h> 28 #include <linux/interrupt.h> 29 #include <linux/capability.h> 30 #include <linux/skbuff.h> 31 #include <linux/init.h> 32 #include <linux/security.h> 33 #include <linux/mutex.h> 34 #include <linux/if_addr.h> 35 #include <linux/if_bridge.h> 36 #include <linux/if_vlan.h> 37 #include <linux/pci.h> 38 #include <linux/etherdevice.h> 39 #include <linux/bpf.h> 40 41 #include <linux/uaccess.h> 42 43 #include <linux/inet.h> 44 #include <linux/netdevice.h> 45 #include <net/ip.h> 46 #include <net/protocol.h> 47 #include <net/arp.h> 48 #include <net/route.h> 49 #include <net/udp.h> 50 #include <net/tcp.h> 51 #include <net/sock.h> 52 #include <net/pkt_sched.h> 53 #include <net/fib_rules.h> 54 #include <net/rtnetlink.h> 55 #include <net/net_namespace.h> 56 57 #define RTNL_MAX_TYPE 50 58 #define RTNL_SLAVE_MAX_TYPE 40 59 60 struct rtnl_link { 61 rtnl_doit_func doit; 62 rtnl_dumpit_func dumpit; 63 struct module *owner; 64 unsigned int flags; 65 struct rcu_head rcu; 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 int rtnl_lock_killable(void) 77 { 78 return mutex_lock_killable(&rtnl_mutex); 79 } 80 EXPORT_SYMBOL(rtnl_lock_killable); 81 82 static struct sk_buff *defer_kfree_skb_list; 83 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail) 84 { 85 if (head && tail) { 86 tail->next = defer_kfree_skb_list; 87 defer_kfree_skb_list = head; 88 } 89 } 90 EXPORT_SYMBOL(rtnl_kfree_skbs); 91 92 void __rtnl_unlock(void) 93 { 94 struct sk_buff *head = defer_kfree_skb_list; 95 96 defer_kfree_skb_list = NULL; 97 98 mutex_unlock(&rtnl_mutex); 99 100 while (head) { 101 struct sk_buff *next = head->next; 102 103 kfree_skb(head); 104 cond_resched(); 105 head = next; 106 } 107 } 108 109 void rtnl_unlock(void) 110 { 111 /* This fellow will unlock it for us. */ 112 netdev_run_todo(); 113 } 114 EXPORT_SYMBOL(rtnl_unlock); 115 116 int rtnl_trylock(void) 117 { 118 return mutex_trylock(&rtnl_mutex); 119 } 120 EXPORT_SYMBOL(rtnl_trylock); 121 122 int rtnl_is_locked(void) 123 { 124 return mutex_is_locked(&rtnl_mutex); 125 } 126 EXPORT_SYMBOL(rtnl_is_locked); 127 128 bool refcount_dec_and_rtnl_lock(refcount_t *r) 129 { 130 return refcount_dec_and_mutex_lock(r, &rtnl_mutex); 131 } 132 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock); 133 134 #ifdef CONFIG_PROVE_LOCKING 135 bool lockdep_rtnl_is_held(void) 136 { 137 return lockdep_is_held(&rtnl_mutex); 138 } 139 EXPORT_SYMBOL(lockdep_rtnl_is_held); 140 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 141 142 static struct rtnl_link __rcu *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 143 144 static inline int rtm_msgindex(int msgtype) 145 { 146 int msgindex = msgtype - RTM_BASE; 147 148 /* 149 * msgindex < 0 implies someone tried to register a netlink 150 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 151 * the message type has not been added to linux/rtnetlink.h 152 */ 153 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 154 155 return msgindex; 156 } 157 158 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype) 159 { 160 struct rtnl_link __rcu **tab; 161 162 if (protocol >= ARRAY_SIZE(rtnl_msg_handlers)) 163 protocol = PF_UNSPEC; 164 165 tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]); 166 if (!tab) 167 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]); 168 169 return rcu_dereference_rtnl(tab[msgtype]); 170 } 171 172 static int rtnl_register_internal(struct module *owner, 173 int protocol, int msgtype, 174 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 175 unsigned int flags) 176 { 177 struct rtnl_link *link, *old; 178 struct rtnl_link __rcu **tab; 179 int msgindex; 180 int ret = -ENOBUFS; 181 182 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 183 msgindex = rtm_msgindex(msgtype); 184 185 rtnl_lock(); 186 tab = rtnl_dereference(rtnl_msg_handlers[protocol]); 187 if (tab == NULL) { 188 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL); 189 if (!tab) 190 goto unlock; 191 192 /* ensures we see the 0 stores */ 193 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab); 194 } 195 196 old = rtnl_dereference(tab[msgindex]); 197 if (old) { 198 link = kmemdup(old, sizeof(*old), GFP_KERNEL); 199 if (!link) 200 goto unlock; 201 } else { 202 link = kzalloc(sizeof(*link), GFP_KERNEL); 203 if (!link) 204 goto unlock; 205 } 206 207 WARN_ON(link->owner && link->owner != owner); 208 link->owner = owner; 209 210 WARN_ON(doit && link->doit && link->doit != doit); 211 if (doit) 212 link->doit = doit; 213 WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit); 214 if (dumpit) 215 link->dumpit = dumpit; 216 217 link->flags |= flags; 218 219 /* publish protocol:msgtype */ 220 rcu_assign_pointer(tab[msgindex], link); 221 ret = 0; 222 if (old) 223 kfree_rcu(old, rcu); 224 unlock: 225 rtnl_unlock(); 226 return ret; 227 } 228 229 /** 230 * rtnl_register_module - Register a rtnetlink message type 231 * 232 * @owner: module registering the hook (THIS_MODULE) 233 * @protocol: Protocol family or PF_UNSPEC 234 * @msgtype: rtnetlink message type 235 * @doit: Function pointer called for each request message 236 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 237 * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions 238 * 239 * Like rtnl_register, but for use by removable modules. 240 */ 241 int rtnl_register_module(struct module *owner, 242 int protocol, int msgtype, 243 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 244 unsigned int flags) 245 { 246 return rtnl_register_internal(owner, protocol, msgtype, 247 doit, dumpit, flags); 248 } 249 EXPORT_SYMBOL_GPL(rtnl_register_module); 250 251 /** 252 * rtnl_register - Register a rtnetlink message type 253 * @protocol: Protocol family or PF_UNSPEC 254 * @msgtype: rtnetlink message type 255 * @doit: Function pointer called for each request message 256 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 257 * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions 258 * 259 * Registers the specified function pointers (at least one of them has 260 * to be non-NULL) to be called whenever a request message for the 261 * specified protocol family and message type is received. 262 * 263 * The special protocol family PF_UNSPEC may be used to define fallback 264 * function pointers for the case when no entry for the specific protocol 265 * family exists. 266 */ 267 void rtnl_register(int protocol, int msgtype, 268 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 269 unsigned int flags) 270 { 271 int err; 272 273 err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit, 274 flags); 275 if (err) 276 pr_err("Unable to register rtnetlink message handler, " 277 "protocol = %d, message type = %d\n", protocol, msgtype); 278 } 279 280 /** 281 * rtnl_unregister - Unregister a rtnetlink message type 282 * @protocol: Protocol family or PF_UNSPEC 283 * @msgtype: rtnetlink message type 284 * 285 * Returns 0 on success or a negative error code. 286 */ 287 int rtnl_unregister(int protocol, int msgtype) 288 { 289 struct rtnl_link __rcu **tab; 290 struct rtnl_link *link; 291 int msgindex; 292 293 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 294 msgindex = rtm_msgindex(msgtype); 295 296 rtnl_lock(); 297 tab = rtnl_dereference(rtnl_msg_handlers[protocol]); 298 if (!tab) { 299 rtnl_unlock(); 300 return -ENOENT; 301 } 302 303 link = rtnl_dereference(tab[msgindex]); 304 rcu_assign_pointer(tab[msgindex], NULL); 305 rtnl_unlock(); 306 307 kfree_rcu(link, rcu); 308 309 return 0; 310 } 311 EXPORT_SYMBOL_GPL(rtnl_unregister); 312 313 /** 314 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 315 * @protocol : Protocol family or PF_UNSPEC 316 * 317 * Identical to calling rtnl_unregster() for all registered message types 318 * of a certain protocol family. 319 */ 320 void rtnl_unregister_all(int protocol) 321 { 322 struct rtnl_link __rcu **tab; 323 struct rtnl_link *link; 324 int msgindex; 325 326 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 327 328 rtnl_lock(); 329 tab = rtnl_dereference(rtnl_msg_handlers[protocol]); 330 if (!tab) { 331 rtnl_unlock(); 332 return; 333 } 334 RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL); 335 for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) { 336 link = rtnl_dereference(tab[msgindex]); 337 if (!link) 338 continue; 339 340 rcu_assign_pointer(tab[msgindex], NULL); 341 kfree_rcu(link, rcu); 342 } 343 rtnl_unlock(); 344 345 synchronize_net(); 346 347 kfree(tab); 348 } 349 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 350 351 static LIST_HEAD(link_ops); 352 353 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 354 { 355 const struct rtnl_link_ops *ops; 356 357 list_for_each_entry(ops, &link_ops, list) { 358 if (!strcmp(ops->kind, kind)) 359 return ops; 360 } 361 return NULL; 362 } 363 364 /** 365 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 366 * @ops: struct rtnl_link_ops * to register 367 * 368 * The caller must hold the rtnl_mutex. This function should be used 369 * by drivers that create devices during module initialization. It 370 * must be called before registering the devices. 371 * 372 * Returns 0 on success or a negative error code. 373 */ 374 int __rtnl_link_register(struct rtnl_link_ops *ops) 375 { 376 if (rtnl_link_ops_get(ops->kind)) 377 return -EEXIST; 378 379 /* The check for alloc/setup is here because if ops 380 * does not have that filled up, it is not possible 381 * to use the ops for creating device. So do not 382 * fill up dellink as well. That disables rtnl_dellink. 383 */ 384 if ((ops->alloc || ops->setup) && !ops->dellink) 385 ops->dellink = unregister_netdevice_queue; 386 387 list_add_tail(&ops->list, &link_ops); 388 return 0; 389 } 390 EXPORT_SYMBOL_GPL(__rtnl_link_register); 391 392 /** 393 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 394 * @ops: struct rtnl_link_ops * to register 395 * 396 * Returns 0 on success or a negative error code. 397 */ 398 int rtnl_link_register(struct rtnl_link_ops *ops) 399 { 400 int err; 401 402 /* Sanity-check max sizes to avoid stack buffer overflow. */ 403 if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE || 404 ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)) 405 return -EINVAL; 406 407 rtnl_lock(); 408 err = __rtnl_link_register(ops); 409 rtnl_unlock(); 410 return err; 411 } 412 EXPORT_SYMBOL_GPL(rtnl_link_register); 413 414 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 415 { 416 struct net_device *dev; 417 LIST_HEAD(list_kill); 418 419 for_each_netdev(net, dev) { 420 if (dev->rtnl_link_ops == ops) 421 ops->dellink(dev, &list_kill); 422 } 423 unregister_netdevice_many(&list_kill); 424 } 425 426 /** 427 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 428 * @ops: struct rtnl_link_ops * to unregister 429 * 430 * The caller must hold the rtnl_mutex and guarantee net_namespace_list 431 * integrity (hold pernet_ops_rwsem for writing to close the race 432 * with setup_net() and cleanup_net()). 433 */ 434 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 435 { 436 struct net *net; 437 438 for_each_net(net) { 439 __rtnl_kill_links(net, ops); 440 } 441 list_del(&ops->list); 442 } 443 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 444 445 /* Return with the rtnl_lock held when there are no network 446 * devices unregistering in any network namespace. 447 */ 448 static void rtnl_lock_unregistering_all(void) 449 { 450 struct net *net; 451 bool unregistering; 452 DEFINE_WAIT_FUNC(wait, woken_wake_function); 453 454 add_wait_queue(&netdev_unregistering_wq, &wait); 455 for (;;) { 456 unregistering = false; 457 rtnl_lock(); 458 /* We held write locked pernet_ops_rwsem, and parallel 459 * setup_net() and cleanup_net() are not possible. 460 */ 461 for_each_net(net) { 462 if (net->dev_unreg_count > 0) { 463 unregistering = true; 464 break; 465 } 466 } 467 if (!unregistering) 468 break; 469 __rtnl_unlock(); 470 471 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 472 } 473 remove_wait_queue(&netdev_unregistering_wq, &wait); 474 } 475 476 /** 477 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 478 * @ops: struct rtnl_link_ops * to unregister 479 */ 480 void rtnl_link_unregister(struct rtnl_link_ops *ops) 481 { 482 /* Close the race with setup_net() and cleanup_net() */ 483 down_write(&pernet_ops_rwsem); 484 rtnl_lock_unregistering_all(); 485 __rtnl_link_unregister(ops); 486 rtnl_unlock(); 487 up_write(&pernet_ops_rwsem); 488 } 489 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 490 491 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 492 { 493 struct net_device *master_dev; 494 const struct rtnl_link_ops *ops; 495 size_t size = 0; 496 497 rcu_read_lock(); 498 499 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev); 500 if (!master_dev) 501 goto out; 502 503 ops = master_dev->rtnl_link_ops; 504 if (!ops || !ops->get_slave_size) 505 goto out; 506 /* IFLA_INFO_SLAVE_DATA + nested data */ 507 size = nla_total_size(sizeof(struct nlattr)) + 508 ops->get_slave_size(master_dev, dev); 509 510 out: 511 rcu_read_unlock(); 512 return size; 513 } 514 515 static size_t rtnl_link_get_size(const struct net_device *dev) 516 { 517 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 518 size_t size; 519 520 if (!ops) 521 return 0; 522 523 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 524 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 525 526 if (ops->get_size) 527 /* IFLA_INFO_DATA + nested data */ 528 size += nla_total_size(sizeof(struct nlattr)) + 529 ops->get_size(dev); 530 531 if (ops->get_xstats_size) 532 /* IFLA_INFO_XSTATS */ 533 size += nla_total_size(ops->get_xstats_size(dev)); 534 535 size += rtnl_link_get_slave_info_data_size(dev); 536 537 return size; 538 } 539 540 static LIST_HEAD(rtnl_af_ops); 541 542 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 543 { 544 const struct rtnl_af_ops *ops; 545 546 ASSERT_RTNL(); 547 548 list_for_each_entry(ops, &rtnl_af_ops, list) { 549 if (ops->family == family) 550 return ops; 551 } 552 553 return NULL; 554 } 555 556 /** 557 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 558 * @ops: struct rtnl_af_ops * to register 559 * 560 * Returns 0 on success or a negative error code. 561 */ 562 void rtnl_af_register(struct rtnl_af_ops *ops) 563 { 564 rtnl_lock(); 565 list_add_tail_rcu(&ops->list, &rtnl_af_ops); 566 rtnl_unlock(); 567 } 568 EXPORT_SYMBOL_GPL(rtnl_af_register); 569 570 /** 571 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 572 * @ops: struct rtnl_af_ops * to unregister 573 */ 574 void rtnl_af_unregister(struct rtnl_af_ops *ops) 575 { 576 rtnl_lock(); 577 list_del_rcu(&ops->list); 578 rtnl_unlock(); 579 580 synchronize_rcu(); 581 } 582 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 583 584 static size_t rtnl_link_get_af_size(const struct net_device *dev, 585 u32 ext_filter_mask) 586 { 587 struct rtnl_af_ops *af_ops; 588 size_t size; 589 590 /* IFLA_AF_SPEC */ 591 size = nla_total_size(sizeof(struct nlattr)); 592 593 rcu_read_lock(); 594 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 595 if (af_ops->get_link_af_size) { 596 /* AF_* + nested data */ 597 size += nla_total_size(sizeof(struct nlattr)) + 598 af_ops->get_link_af_size(dev, ext_filter_mask); 599 } 600 } 601 rcu_read_unlock(); 602 603 return size; 604 } 605 606 static bool rtnl_have_link_slave_info(const struct net_device *dev) 607 { 608 struct net_device *master_dev; 609 bool ret = false; 610 611 rcu_read_lock(); 612 613 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev); 614 if (master_dev && master_dev->rtnl_link_ops) 615 ret = true; 616 rcu_read_unlock(); 617 return ret; 618 } 619 620 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 621 const struct net_device *dev) 622 { 623 struct net_device *master_dev; 624 const struct rtnl_link_ops *ops; 625 struct nlattr *slave_data; 626 int err; 627 628 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 629 if (!master_dev) 630 return 0; 631 ops = master_dev->rtnl_link_ops; 632 if (!ops) 633 return 0; 634 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 635 return -EMSGSIZE; 636 if (ops->fill_slave_info) { 637 slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA); 638 if (!slave_data) 639 return -EMSGSIZE; 640 err = ops->fill_slave_info(skb, master_dev, dev); 641 if (err < 0) 642 goto err_cancel_slave_data; 643 nla_nest_end(skb, slave_data); 644 } 645 return 0; 646 647 err_cancel_slave_data: 648 nla_nest_cancel(skb, slave_data); 649 return err; 650 } 651 652 static int rtnl_link_info_fill(struct sk_buff *skb, 653 const struct net_device *dev) 654 { 655 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 656 struct nlattr *data; 657 int err; 658 659 if (!ops) 660 return 0; 661 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 662 return -EMSGSIZE; 663 if (ops->fill_xstats) { 664 err = ops->fill_xstats(skb, dev); 665 if (err < 0) 666 return err; 667 } 668 if (ops->fill_info) { 669 data = nla_nest_start_noflag(skb, IFLA_INFO_DATA); 670 if (data == NULL) 671 return -EMSGSIZE; 672 err = ops->fill_info(skb, dev); 673 if (err < 0) 674 goto err_cancel_data; 675 nla_nest_end(skb, data); 676 } 677 return 0; 678 679 err_cancel_data: 680 nla_nest_cancel(skb, data); 681 return err; 682 } 683 684 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 685 { 686 struct nlattr *linkinfo; 687 int err = -EMSGSIZE; 688 689 linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO); 690 if (linkinfo == NULL) 691 goto out; 692 693 err = rtnl_link_info_fill(skb, dev); 694 if (err < 0) 695 goto err_cancel_link; 696 697 err = rtnl_link_slave_info_fill(skb, dev); 698 if (err < 0) 699 goto err_cancel_link; 700 701 nla_nest_end(skb, linkinfo); 702 return 0; 703 704 err_cancel_link: 705 nla_nest_cancel(skb, linkinfo); 706 out: 707 return err; 708 } 709 710 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 711 { 712 struct sock *rtnl = net->rtnl; 713 714 return nlmsg_notify(rtnl, skb, pid, group, echo, GFP_KERNEL); 715 } 716 717 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 718 { 719 struct sock *rtnl = net->rtnl; 720 721 return nlmsg_unicast(rtnl, skb, pid); 722 } 723 EXPORT_SYMBOL(rtnl_unicast); 724 725 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 726 struct nlmsghdr *nlh, gfp_t flags) 727 { 728 struct sock *rtnl = net->rtnl; 729 730 nlmsg_notify(rtnl, skb, pid, group, nlmsg_report(nlh), flags); 731 } 732 EXPORT_SYMBOL(rtnl_notify); 733 734 void rtnl_set_sk_err(struct net *net, u32 group, int error) 735 { 736 struct sock *rtnl = net->rtnl; 737 738 netlink_set_err(rtnl, 0, group, error); 739 } 740 EXPORT_SYMBOL(rtnl_set_sk_err); 741 742 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 743 { 744 struct nlattr *mx; 745 int i, valid = 0; 746 747 /* nothing is dumped for dst_default_metrics, so just skip the loop */ 748 if (metrics == dst_default_metrics.metrics) 749 return 0; 750 751 mx = nla_nest_start_noflag(skb, RTA_METRICS); 752 if (mx == NULL) 753 return -ENOBUFS; 754 755 for (i = 0; i < RTAX_MAX; i++) { 756 if (metrics[i]) { 757 if (i == RTAX_CC_ALGO - 1) { 758 char tmp[TCP_CA_NAME_MAX], *name; 759 760 name = tcp_ca_get_name_by_key(metrics[i], tmp); 761 if (!name) 762 continue; 763 if (nla_put_string(skb, i + 1, name)) 764 goto nla_put_failure; 765 } else if (i == RTAX_FEATURES - 1) { 766 u32 user_features = metrics[i] & RTAX_FEATURE_MASK; 767 768 if (!user_features) 769 continue; 770 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); 771 if (nla_put_u32(skb, i + 1, user_features)) 772 goto nla_put_failure; 773 } else { 774 if (nla_put_u32(skb, i + 1, metrics[i])) 775 goto nla_put_failure; 776 } 777 valid++; 778 } 779 } 780 781 if (!valid) { 782 nla_nest_cancel(skb, mx); 783 return 0; 784 } 785 786 return nla_nest_end(skb, mx); 787 788 nla_put_failure: 789 nla_nest_cancel(skb, mx); 790 return -EMSGSIZE; 791 } 792 EXPORT_SYMBOL(rtnetlink_put_metrics); 793 794 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 795 long expires, u32 error) 796 { 797 struct rta_cacheinfo ci = { 798 .rta_error = error, 799 .rta_id = id, 800 }; 801 802 if (dst) { 803 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse); 804 ci.rta_used = dst->__use; 805 ci.rta_clntref = atomic_read(&dst->__refcnt); 806 } 807 if (expires) { 808 unsigned long clock; 809 810 clock = jiffies_to_clock_t(abs(expires)); 811 clock = min_t(unsigned long, clock, INT_MAX); 812 ci.rta_expires = (expires > 0) ? clock : -clock; 813 } 814 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 815 } 816 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 817 818 static void set_operstate(struct net_device *dev, unsigned char transition) 819 { 820 unsigned char operstate = dev->operstate; 821 822 switch (transition) { 823 case IF_OPER_UP: 824 if ((operstate == IF_OPER_DORMANT || 825 operstate == IF_OPER_TESTING || 826 operstate == IF_OPER_UNKNOWN) && 827 !netif_dormant(dev) && !netif_testing(dev)) 828 operstate = IF_OPER_UP; 829 break; 830 831 case IF_OPER_TESTING: 832 if (operstate == IF_OPER_UP || 833 operstate == IF_OPER_UNKNOWN) 834 operstate = IF_OPER_TESTING; 835 break; 836 837 case IF_OPER_DORMANT: 838 if (operstate == IF_OPER_UP || 839 operstate == IF_OPER_UNKNOWN) 840 operstate = IF_OPER_DORMANT; 841 break; 842 } 843 844 if (dev->operstate != operstate) { 845 write_lock_bh(&dev_base_lock); 846 dev->operstate = operstate; 847 write_unlock_bh(&dev_base_lock); 848 netdev_state_change(dev); 849 } 850 } 851 852 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 853 { 854 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 855 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 856 } 857 858 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 859 const struct ifinfomsg *ifm) 860 { 861 unsigned int flags = ifm->ifi_flags; 862 863 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 864 if (ifm->ifi_change) 865 flags = (flags & ifm->ifi_change) | 866 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 867 868 return flags; 869 } 870 871 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 872 const struct rtnl_link_stats64 *b) 873 { 874 a->rx_packets = b->rx_packets; 875 a->tx_packets = b->tx_packets; 876 a->rx_bytes = b->rx_bytes; 877 a->tx_bytes = b->tx_bytes; 878 a->rx_errors = b->rx_errors; 879 a->tx_errors = b->tx_errors; 880 a->rx_dropped = b->rx_dropped; 881 a->tx_dropped = b->tx_dropped; 882 883 a->multicast = b->multicast; 884 a->collisions = b->collisions; 885 886 a->rx_length_errors = b->rx_length_errors; 887 a->rx_over_errors = b->rx_over_errors; 888 a->rx_crc_errors = b->rx_crc_errors; 889 a->rx_frame_errors = b->rx_frame_errors; 890 a->rx_fifo_errors = b->rx_fifo_errors; 891 a->rx_missed_errors = b->rx_missed_errors; 892 893 a->tx_aborted_errors = b->tx_aborted_errors; 894 a->tx_carrier_errors = b->tx_carrier_errors; 895 a->tx_fifo_errors = b->tx_fifo_errors; 896 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 897 a->tx_window_errors = b->tx_window_errors; 898 899 a->rx_compressed = b->rx_compressed; 900 a->tx_compressed = b->tx_compressed; 901 902 a->rx_nohandler = b->rx_nohandler; 903 } 904 905 /* All VF info */ 906 static inline int rtnl_vfinfo_size(const struct net_device *dev, 907 u32 ext_filter_mask) 908 { 909 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) { 910 int num_vfs = dev_num_vf(dev->dev.parent); 911 size_t size = nla_total_size(0); 912 size += num_vfs * 913 (nla_total_size(0) + 914 nla_total_size(sizeof(struct ifla_vf_mac)) + 915 nla_total_size(sizeof(struct ifla_vf_broadcast)) + 916 nla_total_size(sizeof(struct ifla_vf_vlan)) + 917 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */ 918 nla_total_size(MAX_VLAN_LIST_LEN * 919 sizeof(struct ifla_vf_vlan_info)) + 920 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 921 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 922 nla_total_size(sizeof(struct ifla_vf_rate)) + 923 nla_total_size(sizeof(struct ifla_vf_link_state)) + 924 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 925 nla_total_size(0) + /* nest IFLA_VF_STATS */ 926 /* IFLA_VF_STATS_RX_PACKETS */ 927 nla_total_size_64bit(sizeof(__u64)) + 928 /* IFLA_VF_STATS_TX_PACKETS */ 929 nla_total_size_64bit(sizeof(__u64)) + 930 /* IFLA_VF_STATS_RX_BYTES */ 931 nla_total_size_64bit(sizeof(__u64)) + 932 /* IFLA_VF_STATS_TX_BYTES */ 933 nla_total_size_64bit(sizeof(__u64)) + 934 /* IFLA_VF_STATS_BROADCAST */ 935 nla_total_size_64bit(sizeof(__u64)) + 936 /* IFLA_VF_STATS_MULTICAST */ 937 nla_total_size_64bit(sizeof(__u64)) + 938 /* IFLA_VF_STATS_RX_DROPPED */ 939 nla_total_size_64bit(sizeof(__u64)) + 940 /* IFLA_VF_STATS_TX_DROPPED */ 941 nla_total_size_64bit(sizeof(__u64)) + 942 nla_total_size(sizeof(struct ifla_vf_trust))); 943 return size; 944 } else 945 return 0; 946 } 947 948 static size_t rtnl_port_size(const struct net_device *dev, 949 u32 ext_filter_mask) 950 { 951 size_t port_size = nla_total_size(4) /* PORT_VF */ 952 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 953 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 954 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 955 + nla_total_size(1) /* PROT_VDP_REQUEST */ 956 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 957 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 958 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 959 + port_size; 960 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 961 + port_size; 962 963 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 964 !(ext_filter_mask & RTEXT_FILTER_VF)) 965 return 0; 966 if (dev_num_vf(dev->dev.parent)) 967 return port_self_size + vf_ports_size + 968 vf_port_size * dev_num_vf(dev->dev.parent); 969 else 970 return port_self_size; 971 } 972 973 static size_t rtnl_xdp_size(void) 974 { 975 size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */ 976 nla_total_size(1) + /* XDP_ATTACHED */ 977 nla_total_size(4) + /* XDP_PROG_ID (or 1st mode) */ 978 nla_total_size(4); /* XDP_<mode>_PROG_ID */ 979 980 return xdp_size; 981 } 982 983 static size_t rtnl_prop_list_size(const struct net_device *dev) 984 { 985 struct netdev_name_node *name_node; 986 size_t size; 987 988 if (list_empty(&dev->name_node->list)) 989 return 0; 990 size = nla_total_size(0); 991 list_for_each_entry(name_node, &dev->name_node->list, list) 992 size += nla_total_size(ALTIFNAMSIZ); 993 return size; 994 } 995 996 static size_t rtnl_proto_down_size(const struct net_device *dev) 997 { 998 size_t size = nla_total_size(1); 999 1000 if (dev->proto_down_reason) 1001 size += nla_total_size(0) + nla_total_size(4); 1002 1003 return size; 1004 } 1005 1006 static noinline size_t if_nlmsg_size(const struct net_device *dev, 1007 u32 ext_filter_mask) 1008 { 1009 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 1010 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 1011 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 1012 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 1013 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap)) 1014 + nla_total_size(sizeof(struct rtnl_link_stats)) 1015 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64)) 1016 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 1017 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 1018 + nla_total_size(4) /* IFLA_TXQLEN */ 1019 + nla_total_size(4) /* IFLA_WEIGHT */ 1020 + nla_total_size(4) /* IFLA_MTU */ 1021 + nla_total_size(4) /* IFLA_LINK */ 1022 + nla_total_size(4) /* IFLA_MASTER */ 1023 + nla_total_size(1) /* IFLA_CARRIER */ 1024 + nla_total_size(4) /* IFLA_PROMISCUITY */ 1025 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 1026 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 1027 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */ 1028 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */ 1029 + nla_total_size(1) /* IFLA_OPERSTATE */ 1030 + nla_total_size(1) /* IFLA_LINKMODE */ 1031 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 1032 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 1033 + nla_total_size(4) /* IFLA_GROUP */ 1034 + nla_total_size(ext_filter_mask 1035 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 1036 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 1037 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 1038 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 1039 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 1040 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 1041 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 1042 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */ 1043 + rtnl_xdp_size() /* IFLA_XDP */ 1044 + nla_total_size(4) /* IFLA_EVENT */ 1045 + nla_total_size(4) /* IFLA_NEW_NETNSID */ 1046 + nla_total_size(4) /* IFLA_NEW_IFINDEX */ 1047 + rtnl_proto_down_size(dev) /* proto down */ 1048 + nla_total_size(4) /* IFLA_TARGET_NETNSID */ 1049 + nla_total_size(4) /* IFLA_CARRIER_UP_COUNT */ 1050 + nla_total_size(4) /* IFLA_CARRIER_DOWN_COUNT */ 1051 + nla_total_size(4) /* IFLA_MIN_MTU */ 1052 + nla_total_size(4) /* IFLA_MAX_MTU */ 1053 + rtnl_prop_list_size(dev) 1054 + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */ 1055 + 0; 1056 } 1057 1058 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 1059 { 1060 struct nlattr *vf_ports; 1061 struct nlattr *vf_port; 1062 int vf; 1063 int err; 1064 1065 vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS); 1066 if (!vf_ports) 1067 return -EMSGSIZE; 1068 1069 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 1070 vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT); 1071 if (!vf_port) 1072 goto nla_put_failure; 1073 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 1074 goto nla_put_failure; 1075 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 1076 if (err == -EMSGSIZE) 1077 goto nla_put_failure; 1078 if (err) { 1079 nla_nest_cancel(skb, vf_port); 1080 continue; 1081 } 1082 nla_nest_end(skb, vf_port); 1083 } 1084 1085 nla_nest_end(skb, vf_ports); 1086 1087 return 0; 1088 1089 nla_put_failure: 1090 nla_nest_cancel(skb, vf_ports); 1091 return -EMSGSIZE; 1092 } 1093 1094 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 1095 { 1096 struct nlattr *port_self; 1097 int err; 1098 1099 port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF); 1100 if (!port_self) 1101 return -EMSGSIZE; 1102 1103 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 1104 if (err) { 1105 nla_nest_cancel(skb, port_self); 1106 return (err == -EMSGSIZE) ? err : 0; 1107 } 1108 1109 nla_nest_end(skb, port_self); 1110 1111 return 0; 1112 } 1113 1114 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 1115 u32 ext_filter_mask) 1116 { 1117 int err; 1118 1119 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 1120 !(ext_filter_mask & RTEXT_FILTER_VF)) 1121 return 0; 1122 1123 err = rtnl_port_self_fill(skb, dev); 1124 if (err) 1125 return err; 1126 1127 if (dev_num_vf(dev->dev.parent)) { 1128 err = rtnl_vf_ports_fill(skb, dev); 1129 if (err) 1130 return err; 1131 } 1132 1133 return 0; 1134 } 1135 1136 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 1137 { 1138 int err; 1139 struct netdev_phys_item_id ppid; 1140 1141 err = dev_get_phys_port_id(dev, &ppid); 1142 if (err) { 1143 if (err == -EOPNOTSUPP) 1144 return 0; 1145 return err; 1146 } 1147 1148 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1149 return -EMSGSIZE; 1150 1151 return 0; 1152 } 1153 1154 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1155 { 1156 char name[IFNAMSIZ]; 1157 int err; 1158 1159 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1160 if (err) { 1161 if (err == -EOPNOTSUPP) 1162 return 0; 1163 return err; 1164 } 1165 1166 if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name)) 1167 return -EMSGSIZE; 1168 1169 return 0; 1170 } 1171 1172 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1173 { 1174 struct netdev_phys_item_id ppid = { }; 1175 int err; 1176 1177 err = dev_get_port_parent_id(dev, &ppid, false); 1178 if (err) { 1179 if (err == -EOPNOTSUPP) 1180 return 0; 1181 return err; 1182 } 1183 1184 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id)) 1185 return -EMSGSIZE; 1186 1187 return 0; 1188 } 1189 1190 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1191 struct net_device *dev) 1192 { 1193 struct rtnl_link_stats64 *sp; 1194 struct nlattr *attr; 1195 1196 attr = nla_reserve_64bit(skb, IFLA_STATS64, 1197 sizeof(struct rtnl_link_stats64), IFLA_PAD); 1198 if (!attr) 1199 return -EMSGSIZE; 1200 1201 sp = nla_data(attr); 1202 dev_get_stats(dev, sp); 1203 1204 attr = nla_reserve(skb, IFLA_STATS, 1205 sizeof(struct rtnl_link_stats)); 1206 if (!attr) 1207 return -EMSGSIZE; 1208 1209 copy_rtnl_link_stats(nla_data(attr), sp); 1210 1211 return 0; 1212 } 1213 1214 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1215 struct net_device *dev, 1216 int vfs_num, 1217 struct nlattr *vfinfo) 1218 { 1219 struct ifla_vf_rss_query_en vf_rss_query_en; 1220 struct nlattr *vf, *vfstats, *vfvlanlist; 1221 struct ifla_vf_link_state vf_linkstate; 1222 struct ifla_vf_vlan_info vf_vlan_info; 1223 struct ifla_vf_spoofchk vf_spoofchk; 1224 struct ifla_vf_tx_rate vf_tx_rate; 1225 struct ifla_vf_stats vf_stats; 1226 struct ifla_vf_trust vf_trust; 1227 struct ifla_vf_vlan vf_vlan; 1228 struct ifla_vf_rate vf_rate; 1229 struct ifla_vf_mac vf_mac; 1230 struct ifla_vf_broadcast vf_broadcast; 1231 struct ifla_vf_info ivi; 1232 struct ifla_vf_guid node_guid; 1233 struct ifla_vf_guid port_guid; 1234 1235 memset(&ivi, 0, sizeof(ivi)); 1236 1237 /* Not all SR-IOV capable drivers support the 1238 * spoofcheck and "RSS query enable" query. Preset to 1239 * -1 so the user space tool can detect that the driver 1240 * didn't report anything. 1241 */ 1242 ivi.spoofchk = -1; 1243 ivi.rss_query_en = -1; 1244 ivi.trusted = -1; 1245 /* The default value for VF link state is "auto" 1246 * IFLA_VF_LINK_STATE_AUTO which equals zero 1247 */ 1248 ivi.linkstate = 0; 1249 /* VLAN Protocol by default is 802.1Q */ 1250 ivi.vlan_proto = htons(ETH_P_8021Q); 1251 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1252 return 0; 1253 1254 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info)); 1255 memset(&node_guid, 0, sizeof(node_guid)); 1256 memset(&port_guid, 0, sizeof(port_guid)); 1257 1258 vf_mac.vf = 1259 vf_vlan.vf = 1260 vf_vlan_info.vf = 1261 vf_rate.vf = 1262 vf_tx_rate.vf = 1263 vf_spoofchk.vf = 1264 vf_linkstate.vf = 1265 vf_rss_query_en.vf = 1266 vf_trust.vf = 1267 node_guid.vf = 1268 port_guid.vf = ivi.vf; 1269 1270 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1271 memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len); 1272 vf_vlan.vlan = ivi.vlan; 1273 vf_vlan.qos = ivi.qos; 1274 vf_vlan_info.vlan = ivi.vlan; 1275 vf_vlan_info.qos = ivi.qos; 1276 vf_vlan_info.vlan_proto = ivi.vlan_proto; 1277 vf_tx_rate.rate = ivi.max_tx_rate; 1278 vf_rate.min_tx_rate = ivi.min_tx_rate; 1279 vf_rate.max_tx_rate = ivi.max_tx_rate; 1280 vf_spoofchk.setting = ivi.spoofchk; 1281 vf_linkstate.link_state = ivi.linkstate; 1282 vf_rss_query_en.setting = ivi.rss_query_en; 1283 vf_trust.setting = ivi.trusted; 1284 vf = nla_nest_start_noflag(skb, IFLA_VF_INFO); 1285 if (!vf) 1286 goto nla_put_vfinfo_failure; 1287 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1288 nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) || 1289 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1290 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1291 &vf_rate) || 1292 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1293 &vf_tx_rate) || 1294 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1295 &vf_spoofchk) || 1296 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1297 &vf_linkstate) || 1298 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1299 sizeof(vf_rss_query_en), 1300 &vf_rss_query_en) || 1301 nla_put(skb, IFLA_VF_TRUST, 1302 sizeof(vf_trust), &vf_trust)) 1303 goto nla_put_vf_failure; 1304 1305 if (dev->netdev_ops->ndo_get_vf_guid && 1306 !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid, 1307 &port_guid)) { 1308 if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid), 1309 &node_guid) || 1310 nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid), 1311 &port_guid)) 1312 goto nla_put_vf_failure; 1313 } 1314 vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST); 1315 if (!vfvlanlist) 1316 goto nla_put_vf_failure; 1317 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info), 1318 &vf_vlan_info)) { 1319 nla_nest_cancel(skb, vfvlanlist); 1320 goto nla_put_vf_failure; 1321 } 1322 nla_nest_end(skb, vfvlanlist); 1323 memset(&vf_stats, 0, sizeof(vf_stats)); 1324 if (dev->netdev_ops->ndo_get_vf_stats) 1325 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1326 &vf_stats); 1327 vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS); 1328 if (!vfstats) 1329 goto nla_put_vf_failure; 1330 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS, 1331 vf_stats.rx_packets, IFLA_VF_STATS_PAD) || 1332 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS, 1333 vf_stats.tx_packets, IFLA_VF_STATS_PAD) || 1334 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES, 1335 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) || 1336 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES, 1337 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) || 1338 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST, 1339 vf_stats.broadcast, IFLA_VF_STATS_PAD) || 1340 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST, 1341 vf_stats.multicast, IFLA_VF_STATS_PAD) || 1342 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED, 1343 vf_stats.rx_dropped, IFLA_VF_STATS_PAD) || 1344 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED, 1345 vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) { 1346 nla_nest_cancel(skb, vfstats); 1347 goto nla_put_vf_failure; 1348 } 1349 nla_nest_end(skb, vfstats); 1350 nla_nest_end(skb, vf); 1351 return 0; 1352 1353 nla_put_vf_failure: 1354 nla_nest_cancel(skb, vf); 1355 nla_put_vfinfo_failure: 1356 nla_nest_cancel(skb, vfinfo); 1357 return -EMSGSIZE; 1358 } 1359 1360 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb, 1361 struct net_device *dev, 1362 u32 ext_filter_mask) 1363 { 1364 struct nlattr *vfinfo; 1365 int i, num_vfs; 1366 1367 if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0)) 1368 return 0; 1369 1370 num_vfs = dev_num_vf(dev->dev.parent); 1371 if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs)) 1372 return -EMSGSIZE; 1373 1374 if (!dev->netdev_ops->ndo_get_vf_config) 1375 return 0; 1376 1377 vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST); 1378 if (!vfinfo) 1379 return -EMSGSIZE; 1380 1381 for (i = 0; i < num_vfs; i++) { 1382 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1383 return -EMSGSIZE; 1384 } 1385 1386 nla_nest_end(skb, vfinfo); 1387 return 0; 1388 } 1389 1390 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1391 { 1392 struct rtnl_link_ifmap map; 1393 1394 memset(&map, 0, sizeof(map)); 1395 map.mem_start = dev->mem_start; 1396 map.mem_end = dev->mem_end; 1397 map.base_addr = dev->base_addr; 1398 map.irq = dev->irq; 1399 map.dma = dev->dma; 1400 map.port = dev->if_port; 1401 1402 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD)) 1403 return -EMSGSIZE; 1404 1405 return 0; 1406 } 1407 1408 static u32 rtnl_xdp_prog_skb(struct net_device *dev) 1409 { 1410 const struct bpf_prog *generic_xdp_prog; 1411 1412 ASSERT_RTNL(); 1413 1414 generic_xdp_prog = rtnl_dereference(dev->xdp_prog); 1415 if (!generic_xdp_prog) 1416 return 0; 1417 return generic_xdp_prog->aux->id; 1418 } 1419 1420 static u32 rtnl_xdp_prog_drv(struct net_device *dev) 1421 { 1422 return dev_xdp_prog_id(dev, XDP_MODE_DRV); 1423 } 1424 1425 static u32 rtnl_xdp_prog_hw(struct net_device *dev) 1426 { 1427 return dev_xdp_prog_id(dev, XDP_MODE_HW); 1428 } 1429 1430 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev, 1431 u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr, 1432 u32 (*get_prog_id)(struct net_device *dev)) 1433 { 1434 u32 curr_id; 1435 int err; 1436 1437 curr_id = get_prog_id(dev); 1438 if (!curr_id) 1439 return 0; 1440 1441 *prog_id = curr_id; 1442 err = nla_put_u32(skb, attr, curr_id); 1443 if (err) 1444 return err; 1445 1446 if (*mode != XDP_ATTACHED_NONE) 1447 *mode = XDP_ATTACHED_MULTI; 1448 else 1449 *mode = tgt_mode; 1450 1451 return 0; 1452 } 1453 1454 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev) 1455 { 1456 struct nlattr *xdp; 1457 u32 prog_id; 1458 int err; 1459 u8 mode; 1460 1461 xdp = nla_nest_start_noflag(skb, IFLA_XDP); 1462 if (!xdp) 1463 return -EMSGSIZE; 1464 1465 prog_id = 0; 1466 mode = XDP_ATTACHED_NONE; 1467 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB, 1468 IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb); 1469 if (err) 1470 goto err_cancel; 1471 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV, 1472 IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv); 1473 if (err) 1474 goto err_cancel; 1475 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW, 1476 IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw); 1477 if (err) 1478 goto err_cancel; 1479 1480 err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode); 1481 if (err) 1482 goto err_cancel; 1483 1484 if (prog_id && mode != XDP_ATTACHED_MULTI) { 1485 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id); 1486 if (err) 1487 goto err_cancel; 1488 } 1489 1490 nla_nest_end(skb, xdp); 1491 return 0; 1492 1493 err_cancel: 1494 nla_nest_cancel(skb, xdp); 1495 return err; 1496 } 1497 1498 static u32 rtnl_get_event(unsigned long event) 1499 { 1500 u32 rtnl_event_type = IFLA_EVENT_NONE; 1501 1502 switch (event) { 1503 case NETDEV_REBOOT: 1504 rtnl_event_type = IFLA_EVENT_REBOOT; 1505 break; 1506 case NETDEV_FEAT_CHANGE: 1507 rtnl_event_type = IFLA_EVENT_FEATURES; 1508 break; 1509 case NETDEV_BONDING_FAILOVER: 1510 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER; 1511 break; 1512 case NETDEV_NOTIFY_PEERS: 1513 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS; 1514 break; 1515 case NETDEV_RESEND_IGMP: 1516 rtnl_event_type = IFLA_EVENT_IGMP_RESEND; 1517 break; 1518 case NETDEV_CHANGEINFODATA: 1519 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS; 1520 break; 1521 default: 1522 break; 1523 } 1524 1525 return rtnl_event_type; 1526 } 1527 1528 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev) 1529 { 1530 const struct net_device *upper_dev; 1531 int ret = 0; 1532 1533 rcu_read_lock(); 1534 1535 upper_dev = netdev_master_upper_dev_get_rcu(dev); 1536 if (upper_dev) 1537 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex); 1538 1539 rcu_read_unlock(); 1540 return ret; 1541 } 1542 1543 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev, 1544 bool force) 1545 { 1546 int ifindex = dev_get_iflink(dev); 1547 1548 if (force || dev->ifindex != ifindex) 1549 return nla_put_u32(skb, IFLA_LINK, ifindex); 1550 1551 return 0; 1552 } 1553 1554 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb, 1555 struct net_device *dev) 1556 { 1557 char buf[IFALIASZ]; 1558 int ret; 1559 1560 ret = dev_get_alias(dev, buf, sizeof(buf)); 1561 return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0; 1562 } 1563 1564 static int rtnl_fill_link_netnsid(struct sk_buff *skb, 1565 const struct net_device *dev, 1566 struct net *src_net, gfp_t gfp) 1567 { 1568 bool put_iflink = false; 1569 1570 if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) { 1571 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1572 1573 if (!net_eq(dev_net(dev), link_net)) { 1574 int id = peernet2id_alloc(src_net, link_net, gfp); 1575 1576 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1577 return -EMSGSIZE; 1578 1579 put_iflink = true; 1580 } 1581 } 1582 1583 return nla_put_iflink(skb, dev, put_iflink); 1584 } 1585 1586 static int rtnl_fill_link_af(struct sk_buff *skb, 1587 const struct net_device *dev, 1588 u32 ext_filter_mask) 1589 { 1590 const struct rtnl_af_ops *af_ops; 1591 struct nlattr *af_spec; 1592 1593 af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC); 1594 if (!af_spec) 1595 return -EMSGSIZE; 1596 1597 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 1598 struct nlattr *af; 1599 int err; 1600 1601 if (!af_ops->fill_link_af) 1602 continue; 1603 1604 af = nla_nest_start_noflag(skb, af_ops->family); 1605 if (!af) 1606 return -EMSGSIZE; 1607 1608 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1609 /* 1610 * Caller may return ENODATA to indicate that there 1611 * was no data to be dumped. This is not an error, it 1612 * means we should trim the attribute header and 1613 * continue. 1614 */ 1615 if (err == -ENODATA) 1616 nla_nest_cancel(skb, af); 1617 else if (err < 0) 1618 return -EMSGSIZE; 1619 1620 nla_nest_end(skb, af); 1621 } 1622 1623 nla_nest_end(skb, af_spec); 1624 return 0; 1625 } 1626 1627 static int rtnl_fill_alt_ifnames(struct sk_buff *skb, 1628 const struct net_device *dev) 1629 { 1630 struct netdev_name_node *name_node; 1631 int count = 0; 1632 1633 list_for_each_entry(name_node, &dev->name_node->list, list) { 1634 if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name)) 1635 return -EMSGSIZE; 1636 count++; 1637 } 1638 return count; 1639 } 1640 1641 static int rtnl_fill_prop_list(struct sk_buff *skb, 1642 const struct net_device *dev) 1643 { 1644 struct nlattr *prop_list; 1645 int ret; 1646 1647 prop_list = nla_nest_start(skb, IFLA_PROP_LIST); 1648 if (!prop_list) 1649 return -EMSGSIZE; 1650 1651 ret = rtnl_fill_alt_ifnames(skb, dev); 1652 if (ret <= 0) 1653 goto nest_cancel; 1654 1655 nla_nest_end(skb, prop_list); 1656 return 0; 1657 1658 nest_cancel: 1659 nla_nest_cancel(skb, prop_list); 1660 return ret; 1661 } 1662 1663 static int rtnl_fill_proto_down(struct sk_buff *skb, 1664 const struct net_device *dev) 1665 { 1666 struct nlattr *pr; 1667 u32 preason; 1668 1669 if (nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1670 goto nla_put_failure; 1671 1672 preason = dev->proto_down_reason; 1673 if (!preason) 1674 return 0; 1675 1676 pr = nla_nest_start(skb, IFLA_PROTO_DOWN_REASON); 1677 if (!pr) 1678 return -EMSGSIZE; 1679 1680 if (nla_put_u32(skb, IFLA_PROTO_DOWN_REASON_VALUE, preason)) { 1681 nla_nest_cancel(skb, pr); 1682 goto nla_put_failure; 1683 } 1684 1685 nla_nest_end(skb, pr); 1686 return 0; 1687 1688 nla_put_failure: 1689 return -EMSGSIZE; 1690 } 1691 1692 static int rtnl_fill_ifinfo(struct sk_buff *skb, 1693 struct net_device *dev, struct net *src_net, 1694 int type, u32 pid, u32 seq, u32 change, 1695 unsigned int flags, u32 ext_filter_mask, 1696 u32 event, int *new_nsid, int new_ifindex, 1697 int tgt_netnsid, gfp_t gfp) 1698 { 1699 struct ifinfomsg *ifm; 1700 struct nlmsghdr *nlh; 1701 1702 ASSERT_RTNL(); 1703 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1704 if (nlh == NULL) 1705 return -EMSGSIZE; 1706 1707 ifm = nlmsg_data(nlh); 1708 ifm->ifi_family = AF_UNSPEC; 1709 ifm->__ifi_pad = 0; 1710 ifm->ifi_type = dev->type; 1711 ifm->ifi_index = dev->ifindex; 1712 ifm->ifi_flags = dev_get_flags(dev); 1713 ifm->ifi_change = change; 1714 1715 if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid)) 1716 goto nla_put_failure; 1717 1718 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1719 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1720 nla_put_u8(skb, IFLA_OPERSTATE, 1721 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1722 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1723 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1724 nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) || 1725 nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) || 1726 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1727 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1728 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1729 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) || 1730 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) || 1731 #ifdef CONFIG_RPS 1732 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1733 #endif 1734 put_master_ifindex(skb, dev) || 1735 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1736 (dev->qdisc && 1737 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1738 nla_put_ifalias(skb, dev) || 1739 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1740 atomic_read(&dev->carrier_up_count) + 1741 atomic_read(&dev->carrier_down_count)) || 1742 nla_put_u32(skb, IFLA_CARRIER_UP_COUNT, 1743 atomic_read(&dev->carrier_up_count)) || 1744 nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT, 1745 atomic_read(&dev->carrier_down_count))) 1746 goto nla_put_failure; 1747 1748 if (rtnl_fill_proto_down(skb, dev)) 1749 goto nla_put_failure; 1750 1751 if (event != IFLA_EVENT_NONE) { 1752 if (nla_put_u32(skb, IFLA_EVENT, event)) 1753 goto nla_put_failure; 1754 } 1755 1756 if (rtnl_fill_link_ifmap(skb, dev)) 1757 goto nla_put_failure; 1758 1759 if (dev->addr_len) { 1760 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1761 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1762 goto nla_put_failure; 1763 } 1764 1765 if (rtnl_phys_port_id_fill(skb, dev)) 1766 goto nla_put_failure; 1767 1768 if (rtnl_phys_port_name_fill(skb, dev)) 1769 goto nla_put_failure; 1770 1771 if (rtnl_phys_switch_id_fill(skb, dev)) 1772 goto nla_put_failure; 1773 1774 if (rtnl_fill_stats(skb, dev)) 1775 goto nla_put_failure; 1776 1777 if (rtnl_fill_vf(skb, dev, ext_filter_mask)) 1778 goto nla_put_failure; 1779 1780 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1781 goto nla_put_failure; 1782 1783 if (rtnl_xdp_fill(skb, dev)) 1784 goto nla_put_failure; 1785 1786 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1787 if (rtnl_link_fill(skb, dev) < 0) 1788 goto nla_put_failure; 1789 } 1790 1791 if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp)) 1792 goto nla_put_failure; 1793 1794 if (new_nsid && 1795 nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0) 1796 goto nla_put_failure; 1797 if (new_ifindex && 1798 nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0) 1799 goto nla_put_failure; 1800 1801 if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) && 1802 nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr)) 1803 goto nla_put_failure; 1804 1805 rcu_read_lock(); 1806 if (rtnl_fill_link_af(skb, dev, ext_filter_mask)) 1807 goto nla_put_failure_rcu; 1808 rcu_read_unlock(); 1809 1810 if (rtnl_fill_prop_list(skb, dev)) 1811 goto nla_put_failure; 1812 1813 if (dev->dev.parent && 1814 nla_put_string(skb, IFLA_PARENT_DEV_NAME, 1815 dev_name(dev->dev.parent))) 1816 goto nla_put_failure; 1817 1818 if (dev->dev.parent && dev->dev.parent->bus && 1819 nla_put_string(skb, IFLA_PARENT_DEV_BUS_NAME, 1820 dev->dev.parent->bus->name)) 1821 goto nla_put_failure; 1822 1823 nlmsg_end(skb, nlh); 1824 return 0; 1825 1826 nla_put_failure_rcu: 1827 rcu_read_unlock(); 1828 nla_put_failure: 1829 nlmsg_cancel(skb, nlh); 1830 return -EMSGSIZE; 1831 } 1832 1833 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1834 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1835 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1836 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1837 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1838 [IFLA_MTU] = { .type = NLA_U32 }, 1839 [IFLA_LINK] = { .type = NLA_U32 }, 1840 [IFLA_MASTER] = { .type = NLA_U32 }, 1841 [IFLA_CARRIER] = { .type = NLA_U8 }, 1842 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1843 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1844 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1845 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1846 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1847 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1848 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1849 /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to 1850 * allow 0-length string (needed to remove an alias). 1851 */ 1852 [IFLA_IFALIAS] = { .type = NLA_BINARY, .len = IFALIASZ - 1 }, 1853 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1854 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1855 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1856 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1857 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1858 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1859 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1860 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1861 [IFLA_GSO_MAX_SEGS] = { .type = NLA_U32 }, 1862 [IFLA_GSO_MAX_SIZE] = { .type = NLA_U32 }, 1863 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1864 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1865 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1866 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1867 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1868 [IFLA_XDP] = { .type = NLA_NESTED }, 1869 [IFLA_EVENT] = { .type = NLA_U32 }, 1870 [IFLA_GROUP] = { .type = NLA_U32 }, 1871 [IFLA_TARGET_NETNSID] = { .type = NLA_S32 }, 1872 [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 }, 1873 [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 }, 1874 [IFLA_MIN_MTU] = { .type = NLA_U32 }, 1875 [IFLA_MAX_MTU] = { .type = NLA_U32 }, 1876 [IFLA_PROP_LIST] = { .type = NLA_NESTED }, 1877 [IFLA_ALT_IFNAME] = { .type = NLA_STRING, 1878 .len = ALTIFNAMSIZ - 1 }, 1879 [IFLA_PERM_ADDRESS] = { .type = NLA_REJECT }, 1880 [IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED }, 1881 [IFLA_NEW_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1), 1882 [IFLA_PARENT_DEV_NAME] = { .type = NLA_NUL_STRING }, 1883 }; 1884 1885 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1886 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1887 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1888 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1889 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1890 }; 1891 1892 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1893 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1894 [IFLA_VF_BROADCAST] = { .type = NLA_REJECT }, 1895 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1896 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED }, 1897 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1898 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1899 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1900 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1901 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1902 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1903 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1904 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1905 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1906 }; 1907 1908 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1909 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1910 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1911 .len = PORT_PROFILE_MAX }, 1912 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1913 .len = PORT_UUID_MAX }, 1914 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1915 .len = PORT_UUID_MAX }, 1916 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1917 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1918 1919 /* Unused, but we need to keep it here since user space could 1920 * fill it. It's also broken with regard to NLA_BINARY use in 1921 * combination with structs. 1922 */ 1923 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1924 .len = sizeof(struct ifla_port_vsi) }, 1925 }; 1926 1927 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = { 1928 [IFLA_XDP_UNSPEC] = { .strict_start_type = IFLA_XDP_EXPECTED_FD }, 1929 [IFLA_XDP_FD] = { .type = NLA_S32 }, 1930 [IFLA_XDP_EXPECTED_FD] = { .type = NLA_S32 }, 1931 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 }, 1932 [IFLA_XDP_FLAGS] = { .type = NLA_U32 }, 1933 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 }, 1934 }; 1935 1936 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 1937 { 1938 const struct rtnl_link_ops *ops = NULL; 1939 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 1940 1941 if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0) 1942 return NULL; 1943 1944 if (linfo[IFLA_INFO_KIND]) { 1945 char kind[MODULE_NAME_LEN]; 1946 1947 nla_strscpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 1948 ops = rtnl_link_ops_get(kind); 1949 } 1950 1951 return ops; 1952 } 1953 1954 static bool link_master_filtered(struct net_device *dev, int master_idx) 1955 { 1956 struct net_device *master; 1957 1958 if (!master_idx) 1959 return false; 1960 1961 master = netdev_master_upper_dev_get(dev); 1962 if (!master || master->ifindex != master_idx) 1963 return true; 1964 1965 return false; 1966 } 1967 1968 static bool link_kind_filtered(const struct net_device *dev, 1969 const struct rtnl_link_ops *kind_ops) 1970 { 1971 if (kind_ops && dev->rtnl_link_ops != kind_ops) 1972 return true; 1973 1974 return false; 1975 } 1976 1977 static bool link_dump_filtered(struct net_device *dev, 1978 int master_idx, 1979 const struct rtnl_link_ops *kind_ops) 1980 { 1981 if (link_master_filtered(dev, master_idx) || 1982 link_kind_filtered(dev, kind_ops)) 1983 return true; 1984 1985 return false; 1986 } 1987 1988 /** 1989 * rtnl_get_net_ns_capable - Get netns if sufficiently privileged. 1990 * @sk: netlink socket 1991 * @netnsid: network namespace identifier 1992 * 1993 * Returns the network namespace identified by netnsid on success or an error 1994 * pointer on failure. 1995 */ 1996 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid) 1997 { 1998 struct net *net; 1999 2000 net = get_net_ns_by_id(sock_net(sk), netnsid); 2001 if (!net) 2002 return ERR_PTR(-EINVAL); 2003 2004 /* For now, the caller is required to have CAP_NET_ADMIN in 2005 * the user namespace owning the target net ns. 2006 */ 2007 if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) { 2008 put_net(net); 2009 return ERR_PTR(-EACCES); 2010 } 2011 return net; 2012 } 2013 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable); 2014 2015 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh, 2016 bool strict_check, struct nlattr **tb, 2017 struct netlink_ext_ack *extack) 2018 { 2019 int hdrlen; 2020 2021 if (strict_check) { 2022 struct ifinfomsg *ifm; 2023 2024 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 2025 NL_SET_ERR_MSG(extack, "Invalid header for link dump"); 2026 return -EINVAL; 2027 } 2028 2029 ifm = nlmsg_data(nlh); 2030 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 2031 ifm->ifi_change) { 2032 NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request"); 2033 return -EINVAL; 2034 } 2035 if (ifm->ifi_index) { 2036 NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps"); 2037 return -EINVAL; 2038 } 2039 2040 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, 2041 IFLA_MAX, ifla_policy, 2042 extack); 2043 } 2044 2045 /* A hack to preserve kernel<->userspace interface. 2046 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 2047 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 2048 * what iproute2 < v3.9.0 used. 2049 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 2050 * attribute, its netlink message is shorter than struct ifinfomsg. 2051 */ 2052 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2053 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2054 2055 return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, 2056 extack); 2057 } 2058 2059 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 2060 { 2061 struct netlink_ext_ack *extack = cb->extack; 2062 const struct nlmsghdr *nlh = cb->nlh; 2063 struct net *net = sock_net(skb->sk); 2064 struct net *tgt_net = net; 2065 int h, s_h; 2066 int idx = 0, s_idx; 2067 struct net_device *dev; 2068 struct hlist_head *head; 2069 struct nlattr *tb[IFLA_MAX+1]; 2070 u32 ext_filter_mask = 0; 2071 const struct rtnl_link_ops *kind_ops = NULL; 2072 unsigned int flags = NLM_F_MULTI; 2073 int master_idx = 0; 2074 int netnsid = -1; 2075 int err, i; 2076 2077 s_h = cb->args[0]; 2078 s_idx = cb->args[1]; 2079 2080 err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack); 2081 if (err < 0) { 2082 if (cb->strict_check) 2083 return err; 2084 2085 goto walk_entries; 2086 } 2087 2088 for (i = 0; i <= IFLA_MAX; ++i) { 2089 if (!tb[i]) 2090 continue; 2091 2092 /* new attributes should only be added with strict checking */ 2093 switch (i) { 2094 case IFLA_TARGET_NETNSID: 2095 netnsid = nla_get_s32(tb[i]); 2096 tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid); 2097 if (IS_ERR(tgt_net)) { 2098 NL_SET_ERR_MSG(extack, "Invalid target network namespace id"); 2099 return PTR_ERR(tgt_net); 2100 } 2101 break; 2102 case IFLA_EXT_MASK: 2103 ext_filter_mask = nla_get_u32(tb[i]); 2104 break; 2105 case IFLA_MASTER: 2106 master_idx = nla_get_u32(tb[i]); 2107 break; 2108 case IFLA_LINKINFO: 2109 kind_ops = linkinfo_to_kind_ops(tb[i]); 2110 break; 2111 default: 2112 if (cb->strict_check) { 2113 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request"); 2114 return -EINVAL; 2115 } 2116 } 2117 } 2118 2119 if (master_idx || kind_ops) 2120 flags |= NLM_F_DUMP_FILTERED; 2121 2122 walk_entries: 2123 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 2124 idx = 0; 2125 head = &tgt_net->dev_index_head[h]; 2126 hlist_for_each_entry(dev, head, index_hlist) { 2127 if (link_dump_filtered(dev, master_idx, kind_ops)) 2128 goto cont; 2129 if (idx < s_idx) 2130 goto cont; 2131 err = rtnl_fill_ifinfo(skb, dev, net, 2132 RTM_NEWLINK, 2133 NETLINK_CB(cb->skb).portid, 2134 nlh->nlmsg_seq, 0, flags, 2135 ext_filter_mask, 0, NULL, 0, 2136 netnsid, GFP_KERNEL); 2137 2138 if (err < 0) { 2139 if (likely(skb->len)) 2140 goto out; 2141 2142 goto out_err; 2143 } 2144 cont: 2145 idx++; 2146 } 2147 } 2148 out: 2149 err = skb->len; 2150 out_err: 2151 cb->args[1] = idx; 2152 cb->args[0] = h; 2153 cb->seq = tgt_net->dev_base_seq; 2154 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 2155 if (netnsid >= 0) 2156 put_net(tgt_net); 2157 2158 return err; 2159 } 2160 2161 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len, 2162 struct netlink_ext_ack *exterr) 2163 { 2164 return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy, 2165 exterr); 2166 } 2167 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 2168 2169 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 2170 { 2171 struct net *net; 2172 /* Examine the link attributes and figure out which 2173 * network namespace we are talking about. 2174 */ 2175 if (tb[IFLA_NET_NS_PID]) 2176 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 2177 else if (tb[IFLA_NET_NS_FD]) 2178 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 2179 else 2180 net = get_net(src_net); 2181 return net; 2182 } 2183 EXPORT_SYMBOL(rtnl_link_get_net); 2184 2185 /* Figure out which network namespace we are talking about by 2186 * examining the link attributes in the following order: 2187 * 2188 * 1. IFLA_NET_NS_PID 2189 * 2. IFLA_NET_NS_FD 2190 * 3. IFLA_TARGET_NETNSID 2191 */ 2192 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net, 2193 struct nlattr *tb[]) 2194 { 2195 struct net *net; 2196 2197 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) 2198 return rtnl_link_get_net(src_net, tb); 2199 2200 if (!tb[IFLA_TARGET_NETNSID]) 2201 return get_net(src_net); 2202 2203 net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID])); 2204 if (!net) 2205 return ERR_PTR(-EINVAL); 2206 2207 return net; 2208 } 2209 2210 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb, 2211 struct net *src_net, 2212 struct nlattr *tb[], int cap) 2213 { 2214 struct net *net; 2215 2216 net = rtnl_link_get_net_by_nlattr(src_net, tb); 2217 if (IS_ERR(net)) 2218 return net; 2219 2220 if (!netlink_ns_capable(skb, net->user_ns, cap)) { 2221 put_net(net); 2222 return ERR_PTR(-EPERM); 2223 } 2224 2225 return net; 2226 } 2227 2228 /* Verify that rtnetlink requests do not pass additional properties 2229 * potentially referring to different network namespaces. 2230 */ 2231 static int rtnl_ensure_unique_netns(struct nlattr *tb[], 2232 struct netlink_ext_ack *extack, 2233 bool netns_id_only) 2234 { 2235 2236 if (netns_id_only) { 2237 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD]) 2238 return 0; 2239 2240 NL_SET_ERR_MSG(extack, "specified netns attribute not supported"); 2241 return -EOPNOTSUPP; 2242 } 2243 2244 if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])) 2245 goto invalid_attr; 2246 2247 if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD])) 2248 goto invalid_attr; 2249 2250 if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID])) 2251 goto invalid_attr; 2252 2253 return 0; 2254 2255 invalid_attr: 2256 NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified"); 2257 return -EINVAL; 2258 } 2259 2260 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 2261 { 2262 if (dev) { 2263 if (tb[IFLA_ADDRESS] && 2264 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 2265 return -EINVAL; 2266 2267 if (tb[IFLA_BROADCAST] && 2268 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 2269 return -EINVAL; 2270 } 2271 2272 if (tb[IFLA_AF_SPEC]) { 2273 struct nlattr *af; 2274 int rem, err; 2275 2276 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2277 const struct rtnl_af_ops *af_ops; 2278 2279 af_ops = rtnl_af_lookup(nla_type(af)); 2280 if (!af_ops) 2281 return -EAFNOSUPPORT; 2282 2283 if (!af_ops->set_link_af) 2284 return -EOPNOTSUPP; 2285 2286 if (af_ops->validate_link_af) { 2287 err = af_ops->validate_link_af(dev, af); 2288 if (err < 0) 2289 return err; 2290 } 2291 } 2292 } 2293 2294 return 0; 2295 } 2296 2297 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt, 2298 int guid_type) 2299 { 2300 const struct net_device_ops *ops = dev->netdev_ops; 2301 2302 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type); 2303 } 2304 2305 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type) 2306 { 2307 if (dev->type != ARPHRD_INFINIBAND) 2308 return -EOPNOTSUPP; 2309 2310 return handle_infiniband_guid(dev, ivt, guid_type); 2311 } 2312 2313 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 2314 { 2315 const struct net_device_ops *ops = dev->netdev_ops; 2316 int err = -EINVAL; 2317 2318 if (tb[IFLA_VF_MAC]) { 2319 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 2320 2321 if (ivm->vf >= INT_MAX) 2322 return -EINVAL; 2323 err = -EOPNOTSUPP; 2324 if (ops->ndo_set_vf_mac) 2325 err = ops->ndo_set_vf_mac(dev, ivm->vf, 2326 ivm->mac); 2327 if (err < 0) 2328 return err; 2329 } 2330 2331 if (tb[IFLA_VF_VLAN]) { 2332 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 2333 2334 if (ivv->vf >= INT_MAX) 2335 return -EINVAL; 2336 err = -EOPNOTSUPP; 2337 if (ops->ndo_set_vf_vlan) 2338 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 2339 ivv->qos, 2340 htons(ETH_P_8021Q)); 2341 if (err < 0) 2342 return err; 2343 } 2344 2345 if (tb[IFLA_VF_VLAN_LIST]) { 2346 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN]; 2347 struct nlattr *attr; 2348 int rem, len = 0; 2349 2350 err = -EOPNOTSUPP; 2351 if (!ops->ndo_set_vf_vlan) 2352 return err; 2353 2354 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) { 2355 if (nla_type(attr) != IFLA_VF_VLAN_INFO || 2356 nla_len(attr) < NLA_HDRLEN) { 2357 return -EINVAL; 2358 } 2359 if (len >= MAX_VLAN_LIST_LEN) 2360 return -EOPNOTSUPP; 2361 ivvl[len] = nla_data(attr); 2362 2363 len++; 2364 } 2365 if (len == 0) 2366 return -EINVAL; 2367 2368 if (ivvl[0]->vf >= INT_MAX) 2369 return -EINVAL; 2370 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan, 2371 ivvl[0]->qos, ivvl[0]->vlan_proto); 2372 if (err < 0) 2373 return err; 2374 } 2375 2376 if (tb[IFLA_VF_TX_RATE]) { 2377 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 2378 struct ifla_vf_info ivf; 2379 2380 if (ivt->vf >= INT_MAX) 2381 return -EINVAL; 2382 err = -EOPNOTSUPP; 2383 if (ops->ndo_get_vf_config) 2384 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 2385 if (err < 0) 2386 return err; 2387 2388 err = -EOPNOTSUPP; 2389 if (ops->ndo_set_vf_rate) 2390 err = ops->ndo_set_vf_rate(dev, ivt->vf, 2391 ivf.min_tx_rate, 2392 ivt->rate); 2393 if (err < 0) 2394 return err; 2395 } 2396 2397 if (tb[IFLA_VF_RATE]) { 2398 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 2399 2400 if (ivt->vf >= INT_MAX) 2401 return -EINVAL; 2402 err = -EOPNOTSUPP; 2403 if (ops->ndo_set_vf_rate) 2404 err = ops->ndo_set_vf_rate(dev, ivt->vf, 2405 ivt->min_tx_rate, 2406 ivt->max_tx_rate); 2407 if (err < 0) 2408 return err; 2409 } 2410 2411 if (tb[IFLA_VF_SPOOFCHK]) { 2412 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 2413 2414 if (ivs->vf >= INT_MAX) 2415 return -EINVAL; 2416 err = -EOPNOTSUPP; 2417 if (ops->ndo_set_vf_spoofchk) 2418 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 2419 ivs->setting); 2420 if (err < 0) 2421 return err; 2422 } 2423 2424 if (tb[IFLA_VF_LINK_STATE]) { 2425 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 2426 2427 if (ivl->vf >= INT_MAX) 2428 return -EINVAL; 2429 err = -EOPNOTSUPP; 2430 if (ops->ndo_set_vf_link_state) 2431 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 2432 ivl->link_state); 2433 if (err < 0) 2434 return err; 2435 } 2436 2437 if (tb[IFLA_VF_RSS_QUERY_EN]) { 2438 struct ifla_vf_rss_query_en *ivrssq_en; 2439 2440 err = -EOPNOTSUPP; 2441 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 2442 if (ivrssq_en->vf >= INT_MAX) 2443 return -EINVAL; 2444 if (ops->ndo_set_vf_rss_query_en) 2445 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 2446 ivrssq_en->setting); 2447 if (err < 0) 2448 return err; 2449 } 2450 2451 if (tb[IFLA_VF_TRUST]) { 2452 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 2453 2454 if (ivt->vf >= INT_MAX) 2455 return -EINVAL; 2456 err = -EOPNOTSUPP; 2457 if (ops->ndo_set_vf_trust) 2458 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 2459 if (err < 0) 2460 return err; 2461 } 2462 2463 if (tb[IFLA_VF_IB_NODE_GUID]) { 2464 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]); 2465 2466 if (ivt->vf >= INT_MAX) 2467 return -EINVAL; 2468 if (!ops->ndo_set_vf_guid) 2469 return -EOPNOTSUPP; 2470 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID); 2471 } 2472 2473 if (tb[IFLA_VF_IB_PORT_GUID]) { 2474 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]); 2475 2476 if (ivt->vf >= INT_MAX) 2477 return -EINVAL; 2478 if (!ops->ndo_set_vf_guid) 2479 return -EOPNOTSUPP; 2480 2481 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID); 2482 } 2483 2484 return err; 2485 } 2486 2487 static int do_set_master(struct net_device *dev, int ifindex, 2488 struct netlink_ext_ack *extack) 2489 { 2490 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 2491 const struct net_device_ops *ops; 2492 int err; 2493 2494 if (upper_dev) { 2495 if (upper_dev->ifindex == ifindex) 2496 return 0; 2497 ops = upper_dev->netdev_ops; 2498 if (ops->ndo_del_slave) { 2499 err = ops->ndo_del_slave(upper_dev, dev); 2500 if (err) 2501 return err; 2502 } else { 2503 return -EOPNOTSUPP; 2504 } 2505 } 2506 2507 if (ifindex) { 2508 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 2509 if (!upper_dev) 2510 return -EINVAL; 2511 ops = upper_dev->netdev_ops; 2512 if (ops->ndo_add_slave) { 2513 err = ops->ndo_add_slave(upper_dev, dev, extack); 2514 if (err) 2515 return err; 2516 } else { 2517 return -EOPNOTSUPP; 2518 } 2519 } 2520 return 0; 2521 } 2522 2523 static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = { 2524 [IFLA_PROTO_DOWN_REASON_MASK] = { .type = NLA_U32 }, 2525 [IFLA_PROTO_DOWN_REASON_VALUE] = { .type = NLA_U32 }, 2526 }; 2527 2528 static int do_set_proto_down(struct net_device *dev, 2529 struct nlattr *nl_proto_down, 2530 struct nlattr *nl_proto_down_reason, 2531 struct netlink_ext_ack *extack) 2532 { 2533 struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1]; 2534 const struct net_device_ops *ops = dev->netdev_ops; 2535 unsigned long mask = 0; 2536 u32 value; 2537 bool proto_down; 2538 int err; 2539 2540 if (!ops->ndo_change_proto_down) { 2541 NL_SET_ERR_MSG(extack, "Protodown not supported by device"); 2542 return -EOPNOTSUPP; 2543 } 2544 2545 if (nl_proto_down_reason) { 2546 err = nla_parse_nested_deprecated(pdreason, 2547 IFLA_PROTO_DOWN_REASON_MAX, 2548 nl_proto_down_reason, 2549 ifla_proto_down_reason_policy, 2550 NULL); 2551 if (err < 0) 2552 return err; 2553 2554 if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) { 2555 NL_SET_ERR_MSG(extack, "Invalid protodown reason value"); 2556 return -EINVAL; 2557 } 2558 2559 value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]); 2560 2561 if (pdreason[IFLA_PROTO_DOWN_REASON_MASK]) 2562 mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]); 2563 2564 dev_change_proto_down_reason(dev, mask, value); 2565 } 2566 2567 if (nl_proto_down) { 2568 proto_down = nla_get_u8(nl_proto_down); 2569 2570 /* Don't turn off protodown if there are active reasons */ 2571 if (!proto_down && dev->proto_down_reason) { 2572 NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons"); 2573 return -EBUSY; 2574 } 2575 err = dev_change_proto_down(dev, 2576 proto_down); 2577 if (err) 2578 return err; 2579 } 2580 2581 return 0; 2582 } 2583 2584 #define DO_SETLINK_MODIFIED 0x01 2585 /* notify flag means notify + modified. */ 2586 #define DO_SETLINK_NOTIFY 0x03 2587 static int do_setlink(const struct sk_buff *skb, 2588 struct net_device *dev, struct ifinfomsg *ifm, 2589 struct netlink_ext_ack *extack, 2590 struct nlattr **tb, char *ifname, int status) 2591 { 2592 const struct net_device_ops *ops = dev->netdev_ops; 2593 int err; 2594 2595 err = validate_linkmsg(dev, tb); 2596 if (err < 0) 2597 return err; 2598 2599 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) { 2600 struct net *net; 2601 int new_ifindex; 2602 2603 net = rtnl_link_get_net_capable(skb, dev_net(dev), 2604 tb, CAP_NET_ADMIN); 2605 if (IS_ERR(net)) { 2606 err = PTR_ERR(net); 2607 goto errout; 2608 } 2609 2610 if (tb[IFLA_NEW_IFINDEX]) 2611 new_ifindex = nla_get_s32(tb[IFLA_NEW_IFINDEX]); 2612 else 2613 new_ifindex = 0; 2614 2615 err = __dev_change_net_namespace(dev, net, ifname, new_ifindex); 2616 put_net(net); 2617 if (err) 2618 goto errout; 2619 status |= DO_SETLINK_MODIFIED; 2620 } 2621 2622 if (tb[IFLA_MAP]) { 2623 struct rtnl_link_ifmap *u_map; 2624 struct ifmap k_map; 2625 2626 if (!ops->ndo_set_config) { 2627 err = -EOPNOTSUPP; 2628 goto errout; 2629 } 2630 2631 if (!netif_device_present(dev)) { 2632 err = -ENODEV; 2633 goto errout; 2634 } 2635 2636 u_map = nla_data(tb[IFLA_MAP]); 2637 k_map.mem_start = (unsigned long) u_map->mem_start; 2638 k_map.mem_end = (unsigned long) u_map->mem_end; 2639 k_map.base_addr = (unsigned short) u_map->base_addr; 2640 k_map.irq = (unsigned char) u_map->irq; 2641 k_map.dma = (unsigned char) u_map->dma; 2642 k_map.port = (unsigned char) u_map->port; 2643 2644 err = ops->ndo_set_config(dev, &k_map); 2645 if (err < 0) 2646 goto errout; 2647 2648 status |= DO_SETLINK_NOTIFY; 2649 } 2650 2651 if (tb[IFLA_ADDRESS]) { 2652 struct sockaddr *sa; 2653 int len; 2654 2655 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len, 2656 sizeof(*sa)); 2657 sa = kmalloc(len, GFP_KERNEL); 2658 if (!sa) { 2659 err = -ENOMEM; 2660 goto errout; 2661 } 2662 sa->sa_family = dev->type; 2663 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 2664 dev->addr_len); 2665 err = dev_set_mac_address_user(dev, sa, extack); 2666 kfree(sa); 2667 if (err) 2668 goto errout; 2669 status |= DO_SETLINK_MODIFIED; 2670 } 2671 2672 if (tb[IFLA_MTU]) { 2673 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack); 2674 if (err < 0) 2675 goto errout; 2676 status |= DO_SETLINK_MODIFIED; 2677 } 2678 2679 if (tb[IFLA_GROUP]) { 2680 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2681 status |= DO_SETLINK_NOTIFY; 2682 } 2683 2684 /* 2685 * Interface selected by interface index but interface 2686 * name provided implies that a name change has been 2687 * requested. 2688 */ 2689 if (ifm->ifi_index > 0 && ifname[0]) { 2690 err = dev_change_name(dev, ifname); 2691 if (err < 0) 2692 goto errout; 2693 status |= DO_SETLINK_MODIFIED; 2694 } 2695 2696 if (tb[IFLA_IFALIAS]) { 2697 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 2698 nla_len(tb[IFLA_IFALIAS])); 2699 if (err < 0) 2700 goto errout; 2701 status |= DO_SETLINK_NOTIFY; 2702 } 2703 2704 if (tb[IFLA_BROADCAST]) { 2705 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 2706 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 2707 } 2708 2709 if (ifm->ifi_flags || ifm->ifi_change) { 2710 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm), 2711 extack); 2712 if (err < 0) 2713 goto errout; 2714 } 2715 2716 if (tb[IFLA_MASTER]) { 2717 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); 2718 if (err) 2719 goto errout; 2720 status |= DO_SETLINK_MODIFIED; 2721 } 2722 2723 if (tb[IFLA_CARRIER]) { 2724 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 2725 if (err) 2726 goto errout; 2727 status |= DO_SETLINK_MODIFIED; 2728 } 2729 2730 if (tb[IFLA_TXQLEN]) { 2731 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]); 2732 2733 err = dev_change_tx_queue_len(dev, value); 2734 if (err) 2735 goto errout; 2736 status |= DO_SETLINK_MODIFIED; 2737 } 2738 2739 if (tb[IFLA_GSO_MAX_SIZE]) { 2740 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]); 2741 2742 if (max_size > GSO_MAX_SIZE) { 2743 err = -EINVAL; 2744 goto errout; 2745 } 2746 2747 if (dev->gso_max_size ^ max_size) { 2748 netif_set_gso_max_size(dev, max_size); 2749 status |= DO_SETLINK_MODIFIED; 2750 } 2751 } 2752 2753 if (tb[IFLA_GSO_MAX_SEGS]) { 2754 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]); 2755 2756 if (max_segs > GSO_MAX_SEGS) { 2757 err = -EINVAL; 2758 goto errout; 2759 } 2760 2761 if (dev->gso_max_segs ^ max_segs) { 2762 dev->gso_max_segs = max_segs; 2763 status |= DO_SETLINK_MODIFIED; 2764 } 2765 } 2766 2767 if (tb[IFLA_OPERSTATE]) 2768 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2769 2770 if (tb[IFLA_LINKMODE]) { 2771 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 2772 2773 write_lock_bh(&dev_base_lock); 2774 if (dev->link_mode ^ value) 2775 status |= DO_SETLINK_NOTIFY; 2776 dev->link_mode = value; 2777 write_unlock_bh(&dev_base_lock); 2778 } 2779 2780 if (tb[IFLA_VFINFO_LIST]) { 2781 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 2782 struct nlattr *attr; 2783 int rem; 2784 2785 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 2786 if (nla_type(attr) != IFLA_VF_INFO || 2787 nla_len(attr) < NLA_HDRLEN) { 2788 err = -EINVAL; 2789 goto errout; 2790 } 2791 err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX, 2792 attr, 2793 ifla_vf_policy, 2794 NULL); 2795 if (err < 0) 2796 goto errout; 2797 err = do_setvfinfo(dev, vfinfo); 2798 if (err < 0) 2799 goto errout; 2800 status |= DO_SETLINK_NOTIFY; 2801 } 2802 } 2803 err = 0; 2804 2805 if (tb[IFLA_VF_PORTS]) { 2806 struct nlattr *port[IFLA_PORT_MAX+1]; 2807 struct nlattr *attr; 2808 int vf; 2809 int rem; 2810 2811 err = -EOPNOTSUPP; 2812 if (!ops->ndo_set_vf_port) 2813 goto errout; 2814 2815 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 2816 if (nla_type(attr) != IFLA_VF_PORT || 2817 nla_len(attr) < NLA_HDRLEN) { 2818 err = -EINVAL; 2819 goto errout; 2820 } 2821 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX, 2822 attr, 2823 ifla_port_policy, 2824 NULL); 2825 if (err < 0) 2826 goto errout; 2827 if (!port[IFLA_PORT_VF]) { 2828 err = -EOPNOTSUPP; 2829 goto errout; 2830 } 2831 vf = nla_get_u32(port[IFLA_PORT_VF]); 2832 err = ops->ndo_set_vf_port(dev, vf, port); 2833 if (err < 0) 2834 goto errout; 2835 status |= DO_SETLINK_NOTIFY; 2836 } 2837 } 2838 err = 0; 2839 2840 if (tb[IFLA_PORT_SELF]) { 2841 struct nlattr *port[IFLA_PORT_MAX+1]; 2842 2843 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX, 2844 tb[IFLA_PORT_SELF], 2845 ifla_port_policy, NULL); 2846 if (err < 0) 2847 goto errout; 2848 2849 err = -EOPNOTSUPP; 2850 if (ops->ndo_set_vf_port) 2851 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 2852 if (err < 0) 2853 goto errout; 2854 status |= DO_SETLINK_NOTIFY; 2855 } 2856 2857 if (tb[IFLA_AF_SPEC]) { 2858 struct nlattr *af; 2859 int rem; 2860 2861 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2862 const struct rtnl_af_ops *af_ops; 2863 2864 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af)))); 2865 2866 err = af_ops->set_link_af(dev, af, extack); 2867 if (err < 0) 2868 goto errout; 2869 2870 status |= DO_SETLINK_NOTIFY; 2871 } 2872 } 2873 err = 0; 2874 2875 if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) { 2876 err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN], 2877 tb[IFLA_PROTO_DOWN_REASON], extack); 2878 if (err) 2879 goto errout; 2880 status |= DO_SETLINK_NOTIFY; 2881 } 2882 2883 if (tb[IFLA_XDP]) { 2884 struct nlattr *xdp[IFLA_XDP_MAX + 1]; 2885 u32 xdp_flags = 0; 2886 2887 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX, 2888 tb[IFLA_XDP], 2889 ifla_xdp_policy, NULL); 2890 if (err < 0) 2891 goto errout; 2892 2893 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) { 2894 err = -EINVAL; 2895 goto errout; 2896 } 2897 2898 if (xdp[IFLA_XDP_FLAGS]) { 2899 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]); 2900 if (xdp_flags & ~XDP_FLAGS_MASK) { 2901 err = -EINVAL; 2902 goto errout; 2903 } 2904 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) { 2905 err = -EINVAL; 2906 goto errout; 2907 } 2908 } 2909 2910 if (xdp[IFLA_XDP_FD]) { 2911 int expected_fd = -1; 2912 2913 if (xdp_flags & XDP_FLAGS_REPLACE) { 2914 if (!xdp[IFLA_XDP_EXPECTED_FD]) { 2915 err = -EINVAL; 2916 goto errout; 2917 } 2918 expected_fd = 2919 nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]); 2920 } 2921 2922 err = dev_change_xdp_fd(dev, extack, 2923 nla_get_s32(xdp[IFLA_XDP_FD]), 2924 expected_fd, 2925 xdp_flags); 2926 if (err) 2927 goto errout; 2928 status |= DO_SETLINK_NOTIFY; 2929 } 2930 } 2931 2932 errout: 2933 if (status & DO_SETLINK_MODIFIED) { 2934 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY) 2935 netdev_state_change(dev); 2936 2937 if (err < 0) 2938 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", 2939 dev->name); 2940 } 2941 2942 return err; 2943 } 2944 2945 static struct net_device *rtnl_dev_get(struct net *net, 2946 struct nlattr *ifname_attr, 2947 struct nlattr *altifname_attr, 2948 char *ifname) 2949 { 2950 char buffer[ALTIFNAMSIZ]; 2951 2952 if (!ifname) { 2953 ifname = buffer; 2954 if (ifname_attr) 2955 nla_strscpy(ifname, ifname_attr, IFNAMSIZ); 2956 else if (altifname_attr) 2957 nla_strscpy(ifname, altifname_attr, ALTIFNAMSIZ); 2958 else 2959 return NULL; 2960 } 2961 2962 return __dev_get_by_name(net, ifname); 2963 } 2964 2965 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 2966 struct netlink_ext_ack *extack) 2967 { 2968 struct net *net = sock_net(skb->sk); 2969 struct ifinfomsg *ifm; 2970 struct net_device *dev; 2971 int err; 2972 struct nlattr *tb[IFLA_MAX+1]; 2973 char ifname[IFNAMSIZ]; 2974 2975 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 2976 ifla_policy, extack); 2977 if (err < 0) 2978 goto errout; 2979 2980 err = rtnl_ensure_unique_netns(tb, extack, false); 2981 if (err < 0) 2982 goto errout; 2983 2984 if (tb[IFLA_IFNAME]) 2985 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2986 else 2987 ifname[0] = '\0'; 2988 2989 err = -EINVAL; 2990 ifm = nlmsg_data(nlh); 2991 if (ifm->ifi_index > 0) 2992 dev = __dev_get_by_index(net, ifm->ifi_index); 2993 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 2994 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname); 2995 else 2996 goto errout; 2997 2998 if (dev == NULL) { 2999 err = -ENODEV; 3000 goto errout; 3001 } 3002 3003 err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0); 3004 errout: 3005 return err; 3006 } 3007 3008 static int rtnl_group_dellink(const struct net *net, int group) 3009 { 3010 struct net_device *dev, *aux; 3011 LIST_HEAD(list_kill); 3012 bool found = false; 3013 3014 if (!group) 3015 return -EPERM; 3016 3017 for_each_netdev(net, dev) { 3018 if (dev->group == group) { 3019 const struct rtnl_link_ops *ops; 3020 3021 found = true; 3022 ops = dev->rtnl_link_ops; 3023 if (!ops || !ops->dellink) 3024 return -EOPNOTSUPP; 3025 } 3026 } 3027 3028 if (!found) 3029 return -ENODEV; 3030 3031 for_each_netdev_safe(net, dev, aux) { 3032 if (dev->group == group) { 3033 const struct rtnl_link_ops *ops; 3034 3035 ops = dev->rtnl_link_ops; 3036 ops->dellink(dev, &list_kill); 3037 } 3038 } 3039 unregister_netdevice_many(&list_kill); 3040 3041 return 0; 3042 } 3043 3044 int rtnl_delete_link(struct net_device *dev) 3045 { 3046 const struct rtnl_link_ops *ops; 3047 LIST_HEAD(list_kill); 3048 3049 ops = dev->rtnl_link_ops; 3050 if (!ops || !ops->dellink) 3051 return -EOPNOTSUPP; 3052 3053 ops->dellink(dev, &list_kill); 3054 unregister_netdevice_many(&list_kill); 3055 3056 return 0; 3057 } 3058 EXPORT_SYMBOL_GPL(rtnl_delete_link); 3059 3060 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 3061 struct netlink_ext_ack *extack) 3062 { 3063 struct net *net = sock_net(skb->sk); 3064 struct net *tgt_net = net; 3065 struct net_device *dev = NULL; 3066 struct ifinfomsg *ifm; 3067 struct nlattr *tb[IFLA_MAX+1]; 3068 int err; 3069 int netnsid = -1; 3070 3071 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3072 ifla_policy, extack); 3073 if (err < 0) 3074 return err; 3075 3076 err = rtnl_ensure_unique_netns(tb, extack, true); 3077 if (err < 0) 3078 return err; 3079 3080 if (tb[IFLA_TARGET_NETNSID]) { 3081 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 3082 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid); 3083 if (IS_ERR(tgt_net)) 3084 return PTR_ERR(tgt_net); 3085 } 3086 3087 err = -EINVAL; 3088 ifm = nlmsg_data(nlh); 3089 if (ifm->ifi_index > 0) 3090 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 3091 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3092 dev = rtnl_dev_get(net, tb[IFLA_IFNAME], 3093 tb[IFLA_ALT_IFNAME], NULL); 3094 else if (tb[IFLA_GROUP]) 3095 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP])); 3096 else 3097 goto out; 3098 3099 if (!dev) { 3100 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0) 3101 err = -ENODEV; 3102 3103 goto out; 3104 } 3105 3106 err = rtnl_delete_link(dev); 3107 3108 out: 3109 if (netnsid >= 0) 3110 put_net(tgt_net); 3111 3112 return err; 3113 } 3114 3115 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 3116 { 3117 unsigned int old_flags; 3118 int err; 3119 3120 old_flags = dev->flags; 3121 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 3122 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm), 3123 NULL); 3124 if (err < 0) 3125 return err; 3126 } 3127 3128 if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) { 3129 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags)); 3130 } else { 3131 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 3132 __dev_notify_flags(dev, old_flags, ~0U); 3133 } 3134 return 0; 3135 } 3136 EXPORT_SYMBOL(rtnl_configure_link); 3137 3138 struct net_device *rtnl_create_link(struct net *net, const char *ifname, 3139 unsigned char name_assign_type, 3140 const struct rtnl_link_ops *ops, 3141 struct nlattr *tb[], 3142 struct netlink_ext_ack *extack) 3143 { 3144 struct net_device *dev; 3145 unsigned int num_tx_queues = 1; 3146 unsigned int num_rx_queues = 1; 3147 3148 if (tb[IFLA_NUM_TX_QUEUES]) 3149 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 3150 else if (ops->get_num_tx_queues) 3151 num_tx_queues = ops->get_num_tx_queues(); 3152 3153 if (tb[IFLA_NUM_RX_QUEUES]) 3154 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 3155 else if (ops->get_num_rx_queues) 3156 num_rx_queues = ops->get_num_rx_queues(); 3157 3158 if (num_tx_queues < 1 || num_tx_queues > 4096) { 3159 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues"); 3160 return ERR_PTR(-EINVAL); 3161 } 3162 3163 if (num_rx_queues < 1 || num_rx_queues > 4096) { 3164 NL_SET_ERR_MSG(extack, "Invalid number of receive queues"); 3165 return ERR_PTR(-EINVAL); 3166 } 3167 3168 if (ops->alloc) { 3169 dev = ops->alloc(tb, ifname, name_assign_type, 3170 num_tx_queues, num_rx_queues); 3171 if (IS_ERR(dev)) 3172 return dev; 3173 } else { 3174 dev = alloc_netdev_mqs(ops->priv_size, ifname, 3175 name_assign_type, ops->setup, 3176 num_tx_queues, num_rx_queues); 3177 } 3178 3179 if (!dev) 3180 return ERR_PTR(-ENOMEM); 3181 3182 dev_net_set(dev, net); 3183 dev->rtnl_link_ops = ops; 3184 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 3185 3186 if (tb[IFLA_MTU]) { 3187 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3188 int err; 3189 3190 err = dev_validate_mtu(dev, mtu, extack); 3191 if (err) { 3192 free_netdev(dev); 3193 return ERR_PTR(err); 3194 } 3195 dev->mtu = mtu; 3196 } 3197 if (tb[IFLA_ADDRESS]) { 3198 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 3199 nla_len(tb[IFLA_ADDRESS])); 3200 dev->addr_assign_type = NET_ADDR_SET; 3201 } 3202 if (tb[IFLA_BROADCAST]) 3203 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 3204 nla_len(tb[IFLA_BROADCAST])); 3205 if (tb[IFLA_TXQLEN]) 3206 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 3207 if (tb[IFLA_OPERSTATE]) 3208 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 3209 if (tb[IFLA_LINKMODE]) 3210 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 3211 if (tb[IFLA_GROUP]) 3212 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 3213 if (tb[IFLA_GSO_MAX_SIZE]) 3214 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE])); 3215 if (tb[IFLA_GSO_MAX_SEGS]) 3216 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]); 3217 3218 return dev; 3219 } 3220 EXPORT_SYMBOL(rtnl_create_link); 3221 3222 static int rtnl_group_changelink(const struct sk_buff *skb, 3223 struct net *net, int group, 3224 struct ifinfomsg *ifm, 3225 struct netlink_ext_ack *extack, 3226 struct nlattr **tb) 3227 { 3228 struct net_device *dev, *aux; 3229 int err; 3230 3231 for_each_netdev_safe(net, dev, aux) { 3232 if (dev->group == group) { 3233 err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0); 3234 if (err < 0) 3235 return err; 3236 } 3237 } 3238 3239 return 0; 3240 } 3241 3242 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3243 struct nlattr **attr, struct netlink_ext_ack *extack) 3244 { 3245 struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1]; 3246 unsigned char name_assign_type = NET_NAME_USER; 3247 struct nlattr *linkinfo[IFLA_INFO_MAX + 1]; 3248 const struct rtnl_link_ops *m_ops = NULL; 3249 struct net_device *master_dev = NULL; 3250 struct net *net = sock_net(skb->sk); 3251 const struct rtnl_link_ops *ops; 3252 struct nlattr *tb[IFLA_MAX + 1]; 3253 struct net *dest_net, *link_net; 3254 struct nlattr **slave_data; 3255 char kind[MODULE_NAME_LEN]; 3256 struct net_device *dev; 3257 struct ifinfomsg *ifm; 3258 char ifname[IFNAMSIZ]; 3259 struct nlattr **data; 3260 int err; 3261 3262 #ifdef CONFIG_MODULES 3263 replay: 3264 #endif 3265 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3266 ifla_policy, extack); 3267 if (err < 0) 3268 return err; 3269 3270 err = rtnl_ensure_unique_netns(tb, extack, false); 3271 if (err < 0) 3272 return err; 3273 3274 if (tb[IFLA_IFNAME]) 3275 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 3276 else 3277 ifname[0] = '\0'; 3278 3279 ifm = nlmsg_data(nlh); 3280 if (ifm->ifi_index > 0) 3281 dev = __dev_get_by_index(net, ifm->ifi_index); 3282 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3283 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname); 3284 else 3285 dev = NULL; 3286 3287 if (dev) { 3288 master_dev = netdev_master_upper_dev_get(dev); 3289 if (master_dev) 3290 m_ops = master_dev->rtnl_link_ops; 3291 } 3292 3293 err = validate_linkmsg(dev, tb); 3294 if (err < 0) 3295 return err; 3296 3297 if (tb[IFLA_LINKINFO]) { 3298 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX, 3299 tb[IFLA_LINKINFO], 3300 ifla_info_policy, NULL); 3301 if (err < 0) 3302 return err; 3303 } else 3304 memset(linkinfo, 0, sizeof(linkinfo)); 3305 3306 if (linkinfo[IFLA_INFO_KIND]) { 3307 nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 3308 ops = rtnl_link_ops_get(kind); 3309 } else { 3310 kind[0] = '\0'; 3311 ops = NULL; 3312 } 3313 3314 data = NULL; 3315 if (ops) { 3316 if (ops->maxtype > RTNL_MAX_TYPE) 3317 return -EINVAL; 3318 3319 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 3320 err = nla_parse_nested_deprecated(attr, ops->maxtype, 3321 linkinfo[IFLA_INFO_DATA], 3322 ops->policy, extack); 3323 if (err < 0) 3324 return err; 3325 data = attr; 3326 } 3327 if (ops->validate) { 3328 err = ops->validate(tb, data, extack); 3329 if (err < 0) 3330 return err; 3331 } 3332 } 3333 3334 slave_data = NULL; 3335 if (m_ops) { 3336 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE) 3337 return -EINVAL; 3338 3339 if (m_ops->slave_maxtype && 3340 linkinfo[IFLA_INFO_SLAVE_DATA]) { 3341 err = nla_parse_nested_deprecated(slave_attr, 3342 m_ops->slave_maxtype, 3343 linkinfo[IFLA_INFO_SLAVE_DATA], 3344 m_ops->slave_policy, 3345 extack); 3346 if (err < 0) 3347 return err; 3348 slave_data = slave_attr; 3349 } 3350 } 3351 3352 if (dev) { 3353 int status = 0; 3354 3355 if (nlh->nlmsg_flags & NLM_F_EXCL) 3356 return -EEXIST; 3357 if (nlh->nlmsg_flags & NLM_F_REPLACE) 3358 return -EOPNOTSUPP; 3359 3360 if (linkinfo[IFLA_INFO_DATA]) { 3361 if (!ops || ops != dev->rtnl_link_ops || 3362 !ops->changelink) 3363 return -EOPNOTSUPP; 3364 3365 err = ops->changelink(dev, tb, data, extack); 3366 if (err < 0) 3367 return err; 3368 status |= DO_SETLINK_NOTIFY; 3369 } 3370 3371 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 3372 if (!m_ops || !m_ops->slave_changelink) 3373 return -EOPNOTSUPP; 3374 3375 err = m_ops->slave_changelink(master_dev, dev, tb, 3376 slave_data, extack); 3377 if (err < 0) 3378 return err; 3379 status |= DO_SETLINK_NOTIFY; 3380 } 3381 3382 return do_setlink(skb, dev, ifm, extack, tb, ifname, status); 3383 } 3384 3385 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 3386 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 3387 return rtnl_group_changelink(skb, net, 3388 nla_get_u32(tb[IFLA_GROUP]), 3389 ifm, extack, tb); 3390 return -ENODEV; 3391 } 3392 3393 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO]) 3394 return -EOPNOTSUPP; 3395 3396 if (!ops) { 3397 #ifdef CONFIG_MODULES 3398 if (kind[0]) { 3399 __rtnl_unlock(); 3400 request_module("rtnl-link-%s", kind); 3401 rtnl_lock(); 3402 ops = rtnl_link_ops_get(kind); 3403 if (ops) 3404 goto replay; 3405 } 3406 #endif 3407 NL_SET_ERR_MSG(extack, "Unknown device type"); 3408 return -EOPNOTSUPP; 3409 } 3410 3411 if (!ops->alloc && !ops->setup) 3412 return -EOPNOTSUPP; 3413 3414 if (!ifname[0]) { 3415 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 3416 name_assign_type = NET_NAME_ENUM; 3417 } 3418 3419 dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN); 3420 if (IS_ERR(dest_net)) 3421 return PTR_ERR(dest_net); 3422 3423 if (tb[IFLA_LINK_NETNSID]) { 3424 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 3425 3426 link_net = get_net_ns_by_id(dest_net, id); 3427 if (!link_net) { 3428 NL_SET_ERR_MSG(extack, "Unknown network namespace id"); 3429 err = -EINVAL; 3430 goto out; 3431 } 3432 err = -EPERM; 3433 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 3434 goto out; 3435 } else { 3436 link_net = NULL; 3437 } 3438 3439 dev = rtnl_create_link(link_net ? : dest_net, ifname, 3440 name_assign_type, ops, tb, extack); 3441 if (IS_ERR(dev)) { 3442 err = PTR_ERR(dev); 3443 goto out; 3444 } 3445 3446 dev->ifindex = ifm->ifi_index; 3447 3448 if (ops->newlink) 3449 err = ops->newlink(link_net ? : net, dev, tb, data, extack); 3450 else 3451 err = register_netdevice(dev); 3452 if (err < 0) { 3453 free_netdev(dev); 3454 goto out; 3455 } 3456 3457 err = rtnl_configure_link(dev, ifm); 3458 if (err < 0) 3459 goto out_unregister; 3460 if (link_net) { 3461 err = dev_change_net_namespace(dev, dest_net, ifname); 3462 if (err < 0) 3463 goto out_unregister; 3464 } 3465 if (tb[IFLA_MASTER]) { 3466 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); 3467 if (err) 3468 goto out_unregister; 3469 } 3470 out: 3471 if (link_net) 3472 put_net(link_net); 3473 put_net(dest_net); 3474 return err; 3475 out_unregister: 3476 if (ops->newlink) { 3477 LIST_HEAD(list_kill); 3478 3479 ops->dellink(dev, &list_kill); 3480 unregister_netdevice_many(&list_kill); 3481 } else { 3482 unregister_netdevice(dev); 3483 } 3484 goto out; 3485 } 3486 3487 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3488 struct netlink_ext_ack *extack) 3489 { 3490 struct nlattr **attr; 3491 int ret; 3492 3493 attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL); 3494 if (!attr) 3495 return -ENOMEM; 3496 3497 ret = __rtnl_newlink(skb, nlh, attr, extack); 3498 kfree(attr); 3499 return ret; 3500 } 3501 3502 static int rtnl_valid_getlink_req(struct sk_buff *skb, 3503 const struct nlmsghdr *nlh, 3504 struct nlattr **tb, 3505 struct netlink_ext_ack *extack) 3506 { 3507 struct ifinfomsg *ifm; 3508 int i, err; 3509 3510 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 3511 NL_SET_ERR_MSG(extack, "Invalid header for get link"); 3512 return -EINVAL; 3513 } 3514 3515 if (!netlink_strict_get_check(skb)) 3516 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3517 ifla_policy, extack); 3518 3519 ifm = nlmsg_data(nlh); 3520 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 3521 ifm->ifi_change) { 3522 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request"); 3523 return -EINVAL; 3524 } 3525 3526 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX, 3527 ifla_policy, extack); 3528 if (err) 3529 return err; 3530 3531 for (i = 0; i <= IFLA_MAX; i++) { 3532 if (!tb[i]) 3533 continue; 3534 3535 switch (i) { 3536 case IFLA_IFNAME: 3537 case IFLA_ALT_IFNAME: 3538 case IFLA_EXT_MASK: 3539 case IFLA_TARGET_NETNSID: 3540 break; 3541 default: 3542 NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request"); 3543 return -EINVAL; 3544 } 3545 } 3546 3547 return 0; 3548 } 3549 3550 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3551 struct netlink_ext_ack *extack) 3552 { 3553 struct net *net = sock_net(skb->sk); 3554 struct net *tgt_net = net; 3555 struct ifinfomsg *ifm; 3556 struct nlattr *tb[IFLA_MAX+1]; 3557 struct net_device *dev = NULL; 3558 struct sk_buff *nskb; 3559 int netnsid = -1; 3560 int err; 3561 u32 ext_filter_mask = 0; 3562 3563 err = rtnl_valid_getlink_req(skb, nlh, tb, extack); 3564 if (err < 0) 3565 return err; 3566 3567 err = rtnl_ensure_unique_netns(tb, extack, true); 3568 if (err < 0) 3569 return err; 3570 3571 if (tb[IFLA_TARGET_NETNSID]) { 3572 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 3573 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid); 3574 if (IS_ERR(tgt_net)) 3575 return PTR_ERR(tgt_net); 3576 } 3577 3578 if (tb[IFLA_EXT_MASK]) 3579 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 3580 3581 err = -EINVAL; 3582 ifm = nlmsg_data(nlh); 3583 if (ifm->ifi_index > 0) 3584 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 3585 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3586 dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME], 3587 tb[IFLA_ALT_IFNAME], NULL); 3588 else 3589 goto out; 3590 3591 err = -ENODEV; 3592 if (dev == NULL) 3593 goto out; 3594 3595 err = -ENOBUFS; 3596 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 3597 if (nskb == NULL) 3598 goto out; 3599 3600 err = rtnl_fill_ifinfo(nskb, dev, net, 3601 RTM_NEWLINK, NETLINK_CB(skb).portid, 3602 nlh->nlmsg_seq, 0, 0, ext_filter_mask, 3603 0, NULL, 0, netnsid, GFP_KERNEL); 3604 if (err < 0) { 3605 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 3606 WARN_ON(err == -EMSGSIZE); 3607 kfree_skb(nskb); 3608 } else 3609 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 3610 out: 3611 if (netnsid >= 0) 3612 put_net(tgt_net); 3613 3614 return err; 3615 } 3616 3617 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr, 3618 bool *changed, struct netlink_ext_ack *extack) 3619 { 3620 char *alt_ifname; 3621 int err; 3622 3623 err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack); 3624 if (err) 3625 return err; 3626 3627 alt_ifname = nla_strdup(attr, GFP_KERNEL); 3628 if (!alt_ifname) 3629 return -ENOMEM; 3630 3631 if (cmd == RTM_NEWLINKPROP) { 3632 err = netdev_name_node_alt_create(dev, alt_ifname); 3633 if (!err) 3634 alt_ifname = NULL; 3635 } else if (cmd == RTM_DELLINKPROP) { 3636 err = netdev_name_node_alt_destroy(dev, alt_ifname); 3637 } else { 3638 WARN_ON_ONCE(1); 3639 err = -EINVAL; 3640 } 3641 3642 kfree(alt_ifname); 3643 if (!err) 3644 *changed = true; 3645 return err; 3646 } 3647 3648 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh, 3649 struct netlink_ext_ack *extack) 3650 { 3651 struct net *net = sock_net(skb->sk); 3652 struct nlattr *tb[IFLA_MAX + 1]; 3653 struct net_device *dev; 3654 struct ifinfomsg *ifm; 3655 bool changed = false; 3656 struct nlattr *attr; 3657 int err, rem; 3658 3659 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack); 3660 if (err) 3661 return err; 3662 3663 err = rtnl_ensure_unique_netns(tb, extack, true); 3664 if (err) 3665 return err; 3666 3667 ifm = nlmsg_data(nlh); 3668 if (ifm->ifi_index > 0) 3669 dev = __dev_get_by_index(net, ifm->ifi_index); 3670 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3671 dev = rtnl_dev_get(net, tb[IFLA_IFNAME], 3672 tb[IFLA_ALT_IFNAME], NULL); 3673 else 3674 return -EINVAL; 3675 3676 if (!dev) 3677 return -ENODEV; 3678 3679 if (!tb[IFLA_PROP_LIST]) 3680 return 0; 3681 3682 nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) { 3683 switch (nla_type(attr)) { 3684 case IFLA_ALT_IFNAME: 3685 err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack); 3686 if (err) 3687 return err; 3688 break; 3689 } 3690 } 3691 3692 if (changed) 3693 netdev_state_change(dev); 3694 return 0; 3695 } 3696 3697 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh, 3698 struct netlink_ext_ack *extack) 3699 { 3700 return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack); 3701 } 3702 3703 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh, 3704 struct netlink_ext_ack *extack) 3705 { 3706 return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack); 3707 } 3708 3709 static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 3710 { 3711 struct net *net = sock_net(skb->sk); 3712 size_t min_ifinfo_dump_size = 0; 3713 struct nlattr *tb[IFLA_MAX+1]; 3714 u32 ext_filter_mask = 0; 3715 struct net_device *dev; 3716 int hdrlen; 3717 3718 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 3719 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 3720 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 3721 3722 if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) { 3723 if (tb[IFLA_EXT_MASK]) 3724 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 3725 } 3726 3727 if (!ext_filter_mask) 3728 return NLMSG_GOODSIZE; 3729 /* 3730 * traverse the list of net devices and compute the minimum 3731 * buffer size based upon the filter mask. 3732 */ 3733 rcu_read_lock(); 3734 for_each_netdev_rcu(net, dev) { 3735 min_ifinfo_dump_size = max(min_ifinfo_dump_size, 3736 if_nlmsg_size(dev, ext_filter_mask)); 3737 } 3738 rcu_read_unlock(); 3739 3740 return nlmsg_total_size(min_ifinfo_dump_size); 3741 } 3742 3743 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 3744 { 3745 int idx; 3746 int s_idx = cb->family; 3747 int type = cb->nlh->nlmsg_type - RTM_BASE; 3748 int ret = 0; 3749 3750 if (s_idx == 0) 3751 s_idx = 1; 3752 3753 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 3754 struct rtnl_link __rcu **tab; 3755 struct rtnl_link *link; 3756 rtnl_dumpit_func dumpit; 3757 3758 if (idx < s_idx || idx == PF_PACKET) 3759 continue; 3760 3761 if (type < 0 || type >= RTM_NR_MSGTYPES) 3762 continue; 3763 3764 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]); 3765 if (!tab) 3766 continue; 3767 3768 link = rcu_dereference_rtnl(tab[type]); 3769 if (!link) 3770 continue; 3771 3772 dumpit = link->dumpit; 3773 if (!dumpit) 3774 continue; 3775 3776 if (idx > s_idx) { 3777 memset(&cb->args[0], 0, sizeof(cb->args)); 3778 cb->prev_seq = 0; 3779 cb->seq = 0; 3780 } 3781 ret = dumpit(skb, cb); 3782 if (ret) 3783 break; 3784 } 3785 cb->family = idx; 3786 3787 return skb->len ? : ret; 3788 } 3789 3790 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 3791 unsigned int change, 3792 u32 event, gfp_t flags, int *new_nsid, 3793 int new_ifindex) 3794 { 3795 struct net *net = dev_net(dev); 3796 struct sk_buff *skb; 3797 int err = -ENOBUFS; 3798 size_t if_info_size; 3799 3800 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 3801 if (skb == NULL) 3802 goto errout; 3803 3804 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev), 3805 type, 0, 0, change, 0, 0, event, 3806 new_nsid, new_ifindex, -1, flags); 3807 if (err < 0) { 3808 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 3809 WARN_ON(err == -EMSGSIZE); 3810 kfree_skb(skb); 3811 goto errout; 3812 } 3813 return skb; 3814 errout: 3815 if (err < 0) 3816 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3817 return NULL; 3818 } 3819 3820 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 3821 { 3822 struct net *net = dev_net(dev); 3823 3824 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 3825 } 3826 3827 static void rtmsg_ifinfo_event(int type, struct net_device *dev, 3828 unsigned int change, u32 event, 3829 gfp_t flags, int *new_nsid, int new_ifindex) 3830 { 3831 struct sk_buff *skb; 3832 3833 if (dev->reg_state != NETREG_REGISTERED) 3834 return; 3835 3836 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid, 3837 new_ifindex); 3838 if (skb) 3839 rtmsg_ifinfo_send(skb, dev, flags); 3840 } 3841 3842 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 3843 gfp_t flags) 3844 { 3845 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 3846 NULL, 0); 3847 } 3848 3849 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 3850 gfp_t flags, int *new_nsid, int new_ifindex) 3851 { 3852 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 3853 new_nsid, new_ifindex); 3854 } 3855 3856 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 3857 struct net_device *dev, 3858 u8 *addr, u16 vid, u32 pid, u32 seq, 3859 int type, unsigned int flags, 3860 int nlflags, u16 ndm_state) 3861 { 3862 struct nlmsghdr *nlh; 3863 struct ndmsg *ndm; 3864 3865 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 3866 if (!nlh) 3867 return -EMSGSIZE; 3868 3869 ndm = nlmsg_data(nlh); 3870 ndm->ndm_family = AF_BRIDGE; 3871 ndm->ndm_pad1 = 0; 3872 ndm->ndm_pad2 = 0; 3873 ndm->ndm_flags = flags; 3874 ndm->ndm_type = 0; 3875 ndm->ndm_ifindex = dev->ifindex; 3876 ndm->ndm_state = ndm_state; 3877 3878 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 3879 goto nla_put_failure; 3880 if (vid) 3881 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 3882 goto nla_put_failure; 3883 3884 nlmsg_end(skb, nlh); 3885 return 0; 3886 3887 nla_put_failure: 3888 nlmsg_cancel(skb, nlh); 3889 return -EMSGSIZE; 3890 } 3891 3892 static inline size_t rtnl_fdb_nlmsg_size(void) 3893 { 3894 return NLMSG_ALIGN(sizeof(struct ndmsg)) + 3895 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */ 3896 nla_total_size(sizeof(u16)) + /* NDA_VLAN */ 3897 0; 3898 } 3899 3900 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 3901 u16 ndm_state) 3902 { 3903 struct net *net = dev_net(dev); 3904 struct sk_buff *skb; 3905 int err = -ENOBUFS; 3906 3907 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 3908 if (!skb) 3909 goto errout; 3910 3911 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 3912 0, 0, type, NTF_SELF, 0, ndm_state); 3913 if (err < 0) { 3914 kfree_skb(skb); 3915 goto errout; 3916 } 3917 3918 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 3919 return; 3920 errout: 3921 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 3922 } 3923 3924 /* 3925 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 3926 */ 3927 int ndo_dflt_fdb_add(struct ndmsg *ndm, 3928 struct nlattr *tb[], 3929 struct net_device *dev, 3930 const unsigned char *addr, u16 vid, 3931 u16 flags) 3932 { 3933 int err = -EINVAL; 3934 3935 /* If aging addresses are supported device will need to 3936 * implement its own handler for this. 3937 */ 3938 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 3939 netdev_info(dev, "default FDB implementation only supports local addresses\n"); 3940 return err; 3941 } 3942 3943 if (vid) { 3944 netdev_info(dev, "vlans aren't supported yet for dev_uc|mc_add()\n"); 3945 return err; 3946 } 3947 3948 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 3949 err = dev_uc_add_excl(dev, addr); 3950 else if (is_multicast_ether_addr(addr)) 3951 err = dev_mc_add_excl(dev, addr); 3952 3953 /* Only return duplicate errors if NLM_F_EXCL is set */ 3954 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 3955 err = 0; 3956 3957 return err; 3958 } 3959 EXPORT_SYMBOL(ndo_dflt_fdb_add); 3960 3961 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid, 3962 struct netlink_ext_ack *extack) 3963 { 3964 u16 vid = 0; 3965 3966 if (vlan_attr) { 3967 if (nla_len(vlan_attr) != sizeof(u16)) { 3968 NL_SET_ERR_MSG(extack, "invalid vlan attribute size"); 3969 return -EINVAL; 3970 } 3971 3972 vid = nla_get_u16(vlan_attr); 3973 3974 if (!vid || vid >= VLAN_VID_MASK) { 3975 NL_SET_ERR_MSG(extack, "invalid vlan id"); 3976 return -EINVAL; 3977 } 3978 } 3979 *p_vid = vid; 3980 return 0; 3981 } 3982 3983 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, 3984 struct netlink_ext_ack *extack) 3985 { 3986 struct net *net = sock_net(skb->sk); 3987 struct ndmsg *ndm; 3988 struct nlattr *tb[NDA_MAX+1]; 3989 struct net_device *dev; 3990 u8 *addr; 3991 u16 vid; 3992 int err; 3993 3994 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, 3995 extack); 3996 if (err < 0) 3997 return err; 3998 3999 ndm = nlmsg_data(nlh); 4000 if (ndm->ndm_ifindex == 0) { 4001 NL_SET_ERR_MSG(extack, "invalid ifindex"); 4002 return -EINVAL; 4003 } 4004 4005 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 4006 if (dev == NULL) { 4007 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4008 return -ENODEV; 4009 } 4010 4011 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 4012 NL_SET_ERR_MSG(extack, "invalid address"); 4013 return -EINVAL; 4014 } 4015 4016 if (dev->type != ARPHRD_ETHER) { 4017 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices"); 4018 return -EINVAL; 4019 } 4020 4021 addr = nla_data(tb[NDA_LLADDR]); 4022 4023 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 4024 if (err) 4025 return err; 4026 4027 err = -EOPNOTSUPP; 4028 4029 /* Support fdb on master device the net/bridge default case */ 4030 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 4031 netif_is_bridge_port(dev)) { 4032 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4033 const struct net_device_ops *ops = br_dev->netdev_ops; 4034 4035 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 4036 nlh->nlmsg_flags, extack); 4037 if (err) 4038 goto out; 4039 else 4040 ndm->ndm_flags &= ~NTF_MASTER; 4041 } 4042 4043 /* Embedded bridge, macvlan, and any other device support */ 4044 if ((ndm->ndm_flags & NTF_SELF)) { 4045 if (dev->netdev_ops->ndo_fdb_add) 4046 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 4047 vid, 4048 nlh->nlmsg_flags, 4049 extack); 4050 else 4051 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 4052 nlh->nlmsg_flags); 4053 4054 if (!err) { 4055 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 4056 ndm->ndm_state); 4057 ndm->ndm_flags &= ~NTF_SELF; 4058 } 4059 } 4060 out: 4061 return err; 4062 } 4063 4064 /* 4065 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 4066 */ 4067 int ndo_dflt_fdb_del(struct ndmsg *ndm, 4068 struct nlattr *tb[], 4069 struct net_device *dev, 4070 const unsigned char *addr, u16 vid) 4071 { 4072 int err = -EINVAL; 4073 4074 /* If aging addresses are supported device will need to 4075 * implement its own handler for this. 4076 */ 4077 if (!(ndm->ndm_state & NUD_PERMANENT)) { 4078 netdev_info(dev, "default FDB implementation only supports local addresses\n"); 4079 return err; 4080 } 4081 4082 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 4083 err = dev_uc_del(dev, addr); 4084 else if (is_multicast_ether_addr(addr)) 4085 err = dev_mc_del(dev, addr); 4086 4087 return err; 4088 } 4089 EXPORT_SYMBOL(ndo_dflt_fdb_del); 4090 4091 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, 4092 struct netlink_ext_ack *extack) 4093 { 4094 struct net *net = sock_net(skb->sk); 4095 struct ndmsg *ndm; 4096 struct nlattr *tb[NDA_MAX+1]; 4097 struct net_device *dev; 4098 __u8 *addr; 4099 int err; 4100 u16 vid; 4101 4102 if (!netlink_capable(skb, CAP_NET_ADMIN)) 4103 return -EPERM; 4104 4105 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, 4106 extack); 4107 if (err < 0) 4108 return err; 4109 4110 ndm = nlmsg_data(nlh); 4111 if (ndm->ndm_ifindex == 0) { 4112 NL_SET_ERR_MSG(extack, "invalid ifindex"); 4113 return -EINVAL; 4114 } 4115 4116 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 4117 if (dev == NULL) { 4118 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4119 return -ENODEV; 4120 } 4121 4122 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 4123 NL_SET_ERR_MSG(extack, "invalid address"); 4124 return -EINVAL; 4125 } 4126 4127 if (dev->type != ARPHRD_ETHER) { 4128 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices"); 4129 return -EINVAL; 4130 } 4131 4132 addr = nla_data(tb[NDA_LLADDR]); 4133 4134 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 4135 if (err) 4136 return err; 4137 4138 err = -EOPNOTSUPP; 4139 4140 /* Support fdb on master device the net/bridge default case */ 4141 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 4142 netif_is_bridge_port(dev)) { 4143 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4144 const struct net_device_ops *ops = br_dev->netdev_ops; 4145 4146 if (ops->ndo_fdb_del) 4147 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 4148 4149 if (err) 4150 goto out; 4151 else 4152 ndm->ndm_flags &= ~NTF_MASTER; 4153 } 4154 4155 /* Embedded bridge, macvlan, and any other device support */ 4156 if (ndm->ndm_flags & NTF_SELF) { 4157 if (dev->netdev_ops->ndo_fdb_del) 4158 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 4159 vid); 4160 else 4161 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 4162 4163 if (!err) { 4164 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 4165 ndm->ndm_state); 4166 ndm->ndm_flags &= ~NTF_SELF; 4167 } 4168 } 4169 out: 4170 return err; 4171 } 4172 4173 static int nlmsg_populate_fdb(struct sk_buff *skb, 4174 struct netlink_callback *cb, 4175 struct net_device *dev, 4176 int *idx, 4177 struct netdev_hw_addr_list *list) 4178 { 4179 struct netdev_hw_addr *ha; 4180 int err; 4181 u32 portid, seq; 4182 4183 portid = NETLINK_CB(cb->skb).portid; 4184 seq = cb->nlh->nlmsg_seq; 4185 4186 list_for_each_entry(ha, &list->list, list) { 4187 if (*idx < cb->args[2]) 4188 goto skip; 4189 4190 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 4191 portid, seq, 4192 RTM_NEWNEIGH, NTF_SELF, 4193 NLM_F_MULTI, NUD_PERMANENT); 4194 if (err < 0) 4195 return err; 4196 skip: 4197 *idx += 1; 4198 } 4199 return 0; 4200 } 4201 4202 /** 4203 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 4204 * @skb: socket buffer to store message in 4205 * @cb: netlink callback 4206 * @dev: netdevice 4207 * @filter_dev: ignored 4208 * @idx: the number of FDB table entries dumped is added to *@idx 4209 * 4210 * Default netdevice operation to dump the existing unicast address list. 4211 * Returns number of addresses from list put in skb. 4212 */ 4213 int ndo_dflt_fdb_dump(struct sk_buff *skb, 4214 struct netlink_callback *cb, 4215 struct net_device *dev, 4216 struct net_device *filter_dev, 4217 int *idx) 4218 { 4219 int err; 4220 4221 if (dev->type != ARPHRD_ETHER) 4222 return -EINVAL; 4223 4224 netif_addr_lock_bh(dev); 4225 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc); 4226 if (err) 4227 goto out; 4228 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc); 4229 out: 4230 netif_addr_unlock_bh(dev); 4231 return err; 4232 } 4233 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 4234 4235 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh, 4236 int *br_idx, int *brport_idx, 4237 struct netlink_ext_ack *extack) 4238 { 4239 struct nlattr *tb[NDA_MAX + 1]; 4240 struct ndmsg *ndm; 4241 int err, i; 4242 4243 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { 4244 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request"); 4245 return -EINVAL; 4246 } 4247 4248 ndm = nlmsg_data(nlh); 4249 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || 4250 ndm->ndm_flags || ndm->ndm_type) { 4251 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request"); 4252 return -EINVAL; 4253 } 4254 4255 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, 4256 NDA_MAX, NULL, extack); 4257 if (err < 0) 4258 return err; 4259 4260 *brport_idx = ndm->ndm_ifindex; 4261 for (i = 0; i <= NDA_MAX; ++i) { 4262 if (!tb[i]) 4263 continue; 4264 4265 switch (i) { 4266 case NDA_IFINDEX: 4267 if (nla_len(tb[i]) != sizeof(u32)) { 4268 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request"); 4269 return -EINVAL; 4270 } 4271 *brport_idx = nla_get_u32(tb[NDA_IFINDEX]); 4272 break; 4273 case NDA_MASTER: 4274 if (nla_len(tb[i]) != sizeof(u32)) { 4275 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request"); 4276 return -EINVAL; 4277 } 4278 *br_idx = nla_get_u32(tb[NDA_MASTER]); 4279 break; 4280 default: 4281 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request"); 4282 return -EINVAL; 4283 } 4284 } 4285 4286 return 0; 4287 } 4288 4289 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh, 4290 int *br_idx, int *brport_idx, 4291 struct netlink_ext_ack *extack) 4292 { 4293 struct nlattr *tb[IFLA_MAX+1]; 4294 int err; 4295 4296 /* A hack to preserve kernel<->userspace interface. 4297 * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0. 4298 * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails. 4299 * So, check for ndmsg with an optional u32 attribute (not used here). 4300 * Fortunately these sizes don't conflict with the size of ifinfomsg 4301 * with an optional attribute. 4302 */ 4303 if (nlmsg_len(nlh) != sizeof(struct ndmsg) && 4304 (nlmsg_len(nlh) != sizeof(struct ndmsg) + 4305 nla_attr_size(sizeof(u32)))) { 4306 struct ifinfomsg *ifm; 4307 4308 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg), 4309 tb, IFLA_MAX, ifla_policy, 4310 extack); 4311 if (err < 0) { 4312 return -EINVAL; 4313 } else if (err == 0) { 4314 if (tb[IFLA_MASTER]) 4315 *br_idx = nla_get_u32(tb[IFLA_MASTER]); 4316 } 4317 4318 ifm = nlmsg_data(nlh); 4319 *brport_idx = ifm->ifi_index; 4320 } 4321 return 0; 4322 } 4323 4324 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 4325 { 4326 struct net_device *dev; 4327 struct net_device *br_dev = NULL; 4328 const struct net_device_ops *ops = NULL; 4329 const struct net_device_ops *cops = NULL; 4330 struct net *net = sock_net(skb->sk); 4331 struct hlist_head *head; 4332 int brport_idx = 0; 4333 int br_idx = 0; 4334 int h, s_h; 4335 int idx = 0, s_idx; 4336 int err = 0; 4337 int fidx = 0; 4338 4339 if (cb->strict_check) 4340 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx, 4341 cb->extack); 4342 else 4343 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx, 4344 cb->extack); 4345 if (err < 0) 4346 return err; 4347 4348 if (br_idx) { 4349 br_dev = __dev_get_by_index(net, br_idx); 4350 if (!br_dev) 4351 return -ENODEV; 4352 4353 ops = br_dev->netdev_ops; 4354 } 4355 4356 s_h = cb->args[0]; 4357 s_idx = cb->args[1]; 4358 4359 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4360 idx = 0; 4361 head = &net->dev_index_head[h]; 4362 hlist_for_each_entry(dev, head, index_hlist) { 4363 4364 if (brport_idx && (dev->ifindex != brport_idx)) 4365 continue; 4366 4367 if (!br_idx) { /* user did not specify a specific bridge */ 4368 if (netif_is_bridge_port(dev)) { 4369 br_dev = netdev_master_upper_dev_get(dev); 4370 cops = br_dev->netdev_ops; 4371 } 4372 } else { 4373 if (dev != br_dev && 4374 !netif_is_bridge_port(dev)) 4375 continue; 4376 4377 if (br_dev != netdev_master_upper_dev_get(dev) && 4378 !(dev->priv_flags & IFF_EBRIDGE)) 4379 continue; 4380 cops = ops; 4381 } 4382 4383 if (idx < s_idx) 4384 goto cont; 4385 4386 if (netif_is_bridge_port(dev)) { 4387 if (cops && cops->ndo_fdb_dump) { 4388 err = cops->ndo_fdb_dump(skb, cb, 4389 br_dev, dev, 4390 &fidx); 4391 if (err == -EMSGSIZE) 4392 goto out; 4393 } 4394 } 4395 4396 if (dev->netdev_ops->ndo_fdb_dump) 4397 err = dev->netdev_ops->ndo_fdb_dump(skb, cb, 4398 dev, NULL, 4399 &fidx); 4400 else 4401 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, 4402 &fidx); 4403 if (err == -EMSGSIZE) 4404 goto out; 4405 4406 cops = NULL; 4407 4408 /* reset fdb offset to 0 for rest of the interfaces */ 4409 cb->args[2] = 0; 4410 fidx = 0; 4411 cont: 4412 idx++; 4413 } 4414 } 4415 4416 out: 4417 cb->args[0] = h; 4418 cb->args[1] = idx; 4419 cb->args[2] = fidx; 4420 4421 return skb->len; 4422 } 4423 4424 static int valid_fdb_get_strict(const struct nlmsghdr *nlh, 4425 struct nlattr **tb, u8 *ndm_flags, 4426 int *br_idx, int *brport_idx, u8 **addr, 4427 u16 *vid, struct netlink_ext_ack *extack) 4428 { 4429 struct ndmsg *ndm; 4430 int err, i; 4431 4432 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { 4433 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request"); 4434 return -EINVAL; 4435 } 4436 4437 ndm = nlmsg_data(nlh); 4438 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || 4439 ndm->ndm_type) { 4440 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request"); 4441 return -EINVAL; 4442 } 4443 4444 if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) { 4445 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request"); 4446 return -EINVAL; 4447 } 4448 4449 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, 4450 NDA_MAX, nda_policy, extack); 4451 if (err < 0) 4452 return err; 4453 4454 *ndm_flags = ndm->ndm_flags; 4455 *brport_idx = ndm->ndm_ifindex; 4456 for (i = 0; i <= NDA_MAX; ++i) { 4457 if (!tb[i]) 4458 continue; 4459 4460 switch (i) { 4461 case NDA_MASTER: 4462 *br_idx = nla_get_u32(tb[i]); 4463 break; 4464 case NDA_LLADDR: 4465 if (nla_len(tb[i]) != ETH_ALEN) { 4466 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request"); 4467 return -EINVAL; 4468 } 4469 *addr = nla_data(tb[i]); 4470 break; 4471 case NDA_VLAN: 4472 err = fdb_vid_parse(tb[i], vid, extack); 4473 if (err) 4474 return err; 4475 break; 4476 case NDA_VNI: 4477 break; 4478 default: 4479 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request"); 4480 return -EINVAL; 4481 } 4482 } 4483 4484 return 0; 4485 } 4486 4487 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4488 struct netlink_ext_ack *extack) 4489 { 4490 struct net_device *dev = NULL, *br_dev = NULL; 4491 const struct net_device_ops *ops = NULL; 4492 struct net *net = sock_net(in_skb->sk); 4493 struct nlattr *tb[NDA_MAX + 1]; 4494 struct sk_buff *skb; 4495 int brport_idx = 0; 4496 u8 ndm_flags = 0; 4497 int br_idx = 0; 4498 u8 *addr = NULL; 4499 u16 vid = 0; 4500 int err; 4501 4502 err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx, 4503 &brport_idx, &addr, &vid, extack); 4504 if (err < 0) 4505 return err; 4506 4507 if (!addr) { 4508 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request"); 4509 return -EINVAL; 4510 } 4511 4512 if (brport_idx) { 4513 dev = __dev_get_by_index(net, brport_idx); 4514 if (!dev) { 4515 NL_SET_ERR_MSG(extack, "Unknown device ifindex"); 4516 return -ENODEV; 4517 } 4518 } 4519 4520 if (br_idx) { 4521 if (dev) { 4522 NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive"); 4523 return -EINVAL; 4524 } 4525 4526 br_dev = __dev_get_by_index(net, br_idx); 4527 if (!br_dev) { 4528 NL_SET_ERR_MSG(extack, "Invalid master ifindex"); 4529 return -EINVAL; 4530 } 4531 ops = br_dev->netdev_ops; 4532 } 4533 4534 if (dev) { 4535 if (!ndm_flags || (ndm_flags & NTF_MASTER)) { 4536 if (!netif_is_bridge_port(dev)) { 4537 NL_SET_ERR_MSG(extack, "Device is not a bridge port"); 4538 return -EINVAL; 4539 } 4540 br_dev = netdev_master_upper_dev_get(dev); 4541 if (!br_dev) { 4542 NL_SET_ERR_MSG(extack, "Master of device not found"); 4543 return -EINVAL; 4544 } 4545 ops = br_dev->netdev_ops; 4546 } else { 4547 if (!(ndm_flags & NTF_SELF)) { 4548 NL_SET_ERR_MSG(extack, "Missing NTF_SELF"); 4549 return -EINVAL; 4550 } 4551 ops = dev->netdev_ops; 4552 } 4553 } 4554 4555 if (!br_dev && !dev) { 4556 NL_SET_ERR_MSG(extack, "No device specified"); 4557 return -ENODEV; 4558 } 4559 4560 if (!ops || !ops->ndo_fdb_get) { 4561 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device"); 4562 return -EOPNOTSUPP; 4563 } 4564 4565 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 4566 if (!skb) 4567 return -ENOBUFS; 4568 4569 if (br_dev) 4570 dev = br_dev; 4571 err = ops->ndo_fdb_get(skb, tb, dev, addr, vid, 4572 NETLINK_CB(in_skb).portid, 4573 nlh->nlmsg_seq, extack); 4574 if (err) 4575 goto out; 4576 4577 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4578 out: 4579 kfree_skb(skb); 4580 return err; 4581 } 4582 4583 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 4584 unsigned int attrnum, unsigned int flag) 4585 { 4586 if (mask & flag) 4587 return nla_put_u8(skb, attrnum, !!(flags & flag)); 4588 return 0; 4589 } 4590 4591 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 4592 struct net_device *dev, u16 mode, 4593 u32 flags, u32 mask, int nlflags, 4594 u32 filter_mask, 4595 int (*vlan_fill)(struct sk_buff *skb, 4596 struct net_device *dev, 4597 u32 filter_mask)) 4598 { 4599 struct nlmsghdr *nlh; 4600 struct ifinfomsg *ifm; 4601 struct nlattr *br_afspec; 4602 struct nlattr *protinfo; 4603 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 4604 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4605 int err = 0; 4606 4607 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 4608 if (nlh == NULL) 4609 return -EMSGSIZE; 4610 4611 ifm = nlmsg_data(nlh); 4612 ifm->ifi_family = AF_BRIDGE; 4613 ifm->__ifi_pad = 0; 4614 ifm->ifi_type = dev->type; 4615 ifm->ifi_index = dev->ifindex; 4616 ifm->ifi_flags = dev_get_flags(dev); 4617 ifm->ifi_change = 0; 4618 4619 4620 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4621 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4622 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 4623 (br_dev && 4624 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 4625 (dev->addr_len && 4626 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4627 (dev->ifindex != dev_get_iflink(dev) && 4628 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 4629 goto nla_put_failure; 4630 4631 br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC); 4632 if (!br_afspec) 4633 goto nla_put_failure; 4634 4635 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 4636 nla_nest_cancel(skb, br_afspec); 4637 goto nla_put_failure; 4638 } 4639 4640 if (mode != BRIDGE_MODE_UNDEF) { 4641 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 4642 nla_nest_cancel(skb, br_afspec); 4643 goto nla_put_failure; 4644 } 4645 } 4646 if (vlan_fill) { 4647 err = vlan_fill(skb, dev, filter_mask); 4648 if (err) { 4649 nla_nest_cancel(skb, br_afspec); 4650 goto nla_put_failure; 4651 } 4652 } 4653 nla_nest_end(skb, br_afspec); 4654 4655 protinfo = nla_nest_start(skb, IFLA_PROTINFO); 4656 if (!protinfo) 4657 goto nla_put_failure; 4658 4659 if (brport_nla_put_flag(skb, flags, mask, 4660 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 4661 brport_nla_put_flag(skb, flags, mask, 4662 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 4663 brport_nla_put_flag(skb, flags, mask, 4664 IFLA_BRPORT_FAST_LEAVE, 4665 BR_MULTICAST_FAST_LEAVE) || 4666 brport_nla_put_flag(skb, flags, mask, 4667 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 4668 brport_nla_put_flag(skb, flags, mask, 4669 IFLA_BRPORT_LEARNING, BR_LEARNING) || 4670 brport_nla_put_flag(skb, flags, mask, 4671 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 4672 brport_nla_put_flag(skb, flags, mask, 4673 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 4674 brport_nla_put_flag(skb, flags, mask, 4675 IFLA_BRPORT_PROXYARP, BR_PROXYARP) || 4676 brport_nla_put_flag(skb, flags, mask, 4677 IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) || 4678 brport_nla_put_flag(skb, flags, mask, 4679 IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) { 4680 nla_nest_cancel(skb, protinfo); 4681 goto nla_put_failure; 4682 } 4683 4684 nla_nest_end(skb, protinfo); 4685 4686 nlmsg_end(skb, nlh); 4687 return 0; 4688 nla_put_failure: 4689 nlmsg_cancel(skb, nlh); 4690 return err ? err : -EMSGSIZE; 4691 } 4692 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 4693 4694 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh, 4695 bool strict_check, u32 *filter_mask, 4696 struct netlink_ext_ack *extack) 4697 { 4698 struct nlattr *tb[IFLA_MAX+1]; 4699 int err, i; 4700 4701 if (strict_check) { 4702 struct ifinfomsg *ifm; 4703 4704 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 4705 NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump"); 4706 return -EINVAL; 4707 } 4708 4709 ifm = nlmsg_data(nlh); 4710 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 4711 ifm->ifi_change || ifm->ifi_index) { 4712 NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request"); 4713 return -EINVAL; 4714 } 4715 4716 err = nlmsg_parse_deprecated_strict(nlh, 4717 sizeof(struct ifinfomsg), 4718 tb, IFLA_MAX, ifla_policy, 4719 extack); 4720 } else { 4721 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg), 4722 tb, IFLA_MAX, ifla_policy, 4723 extack); 4724 } 4725 if (err < 0) 4726 return err; 4727 4728 /* new attributes should only be added with strict checking */ 4729 for (i = 0; i <= IFLA_MAX; ++i) { 4730 if (!tb[i]) 4731 continue; 4732 4733 switch (i) { 4734 case IFLA_EXT_MASK: 4735 *filter_mask = nla_get_u32(tb[i]); 4736 break; 4737 default: 4738 if (strict_check) { 4739 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request"); 4740 return -EINVAL; 4741 } 4742 } 4743 } 4744 4745 return 0; 4746 } 4747 4748 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 4749 { 4750 const struct nlmsghdr *nlh = cb->nlh; 4751 struct net *net = sock_net(skb->sk); 4752 struct net_device *dev; 4753 int idx = 0; 4754 u32 portid = NETLINK_CB(cb->skb).portid; 4755 u32 seq = nlh->nlmsg_seq; 4756 u32 filter_mask = 0; 4757 int err; 4758 4759 err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask, 4760 cb->extack); 4761 if (err < 0 && cb->strict_check) 4762 return err; 4763 4764 rcu_read_lock(); 4765 for_each_netdev_rcu(net, dev) { 4766 const struct net_device_ops *ops = dev->netdev_ops; 4767 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4768 4769 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 4770 if (idx >= cb->args[0]) { 4771 err = br_dev->netdev_ops->ndo_bridge_getlink( 4772 skb, portid, seq, dev, 4773 filter_mask, NLM_F_MULTI); 4774 if (err < 0 && err != -EOPNOTSUPP) { 4775 if (likely(skb->len)) 4776 break; 4777 4778 goto out_err; 4779 } 4780 } 4781 idx++; 4782 } 4783 4784 if (ops->ndo_bridge_getlink) { 4785 if (idx >= cb->args[0]) { 4786 err = ops->ndo_bridge_getlink(skb, portid, 4787 seq, dev, 4788 filter_mask, 4789 NLM_F_MULTI); 4790 if (err < 0 && err != -EOPNOTSUPP) { 4791 if (likely(skb->len)) 4792 break; 4793 4794 goto out_err; 4795 } 4796 } 4797 idx++; 4798 } 4799 } 4800 err = skb->len; 4801 out_err: 4802 rcu_read_unlock(); 4803 cb->args[0] = idx; 4804 4805 return err; 4806 } 4807 4808 static inline size_t bridge_nlmsg_size(void) 4809 { 4810 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4811 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4812 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4813 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 4814 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 4815 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 4816 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 4817 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 4818 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 4819 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 4820 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 4821 } 4822 4823 static int rtnl_bridge_notify(struct net_device *dev) 4824 { 4825 struct net *net = dev_net(dev); 4826 struct sk_buff *skb; 4827 int err = -EOPNOTSUPP; 4828 4829 if (!dev->netdev_ops->ndo_bridge_getlink) 4830 return 0; 4831 4832 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 4833 if (!skb) { 4834 err = -ENOMEM; 4835 goto errout; 4836 } 4837 4838 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 4839 if (err < 0) 4840 goto errout; 4841 4842 /* Notification info is only filled for bridge ports, not the bridge 4843 * device itself. Therefore, a zero notification length is valid and 4844 * should not result in an error. 4845 */ 4846 if (!skb->len) 4847 goto errout; 4848 4849 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 4850 return 0; 4851 errout: 4852 WARN_ON(err == -EMSGSIZE); 4853 kfree_skb(skb); 4854 if (err) 4855 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 4856 return err; 4857 } 4858 4859 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 4860 struct netlink_ext_ack *extack) 4861 { 4862 struct net *net = sock_net(skb->sk); 4863 struct ifinfomsg *ifm; 4864 struct net_device *dev; 4865 struct nlattr *br_spec, *attr = NULL; 4866 int rem, err = -EOPNOTSUPP; 4867 u16 flags = 0; 4868 bool have_flags = false; 4869 4870 if (nlmsg_len(nlh) < sizeof(*ifm)) 4871 return -EINVAL; 4872 4873 ifm = nlmsg_data(nlh); 4874 if (ifm->ifi_family != AF_BRIDGE) 4875 return -EPFNOSUPPORT; 4876 4877 dev = __dev_get_by_index(net, ifm->ifi_index); 4878 if (!dev) { 4879 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4880 return -ENODEV; 4881 } 4882 4883 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 4884 if (br_spec) { 4885 nla_for_each_nested(attr, br_spec, rem) { 4886 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 4887 if (nla_len(attr) < sizeof(flags)) 4888 return -EINVAL; 4889 4890 have_flags = true; 4891 flags = nla_get_u16(attr); 4892 break; 4893 } 4894 } 4895 } 4896 4897 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 4898 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4899 4900 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 4901 err = -EOPNOTSUPP; 4902 goto out; 4903 } 4904 4905 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags, 4906 extack); 4907 if (err) 4908 goto out; 4909 4910 flags &= ~BRIDGE_FLAGS_MASTER; 4911 } 4912 4913 if ((flags & BRIDGE_FLAGS_SELF)) { 4914 if (!dev->netdev_ops->ndo_bridge_setlink) 4915 err = -EOPNOTSUPP; 4916 else 4917 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 4918 flags, 4919 extack); 4920 if (!err) { 4921 flags &= ~BRIDGE_FLAGS_SELF; 4922 4923 /* Generate event to notify upper layer of bridge 4924 * change 4925 */ 4926 err = rtnl_bridge_notify(dev); 4927 } 4928 } 4929 4930 if (have_flags) 4931 memcpy(nla_data(attr), &flags, sizeof(flags)); 4932 out: 4933 return err; 4934 } 4935 4936 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 4937 struct netlink_ext_ack *extack) 4938 { 4939 struct net *net = sock_net(skb->sk); 4940 struct ifinfomsg *ifm; 4941 struct net_device *dev; 4942 struct nlattr *br_spec, *attr = NULL; 4943 int rem, err = -EOPNOTSUPP; 4944 u16 flags = 0; 4945 bool have_flags = false; 4946 4947 if (nlmsg_len(nlh) < sizeof(*ifm)) 4948 return -EINVAL; 4949 4950 ifm = nlmsg_data(nlh); 4951 if (ifm->ifi_family != AF_BRIDGE) 4952 return -EPFNOSUPPORT; 4953 4954 dev = __dev_get_by_index(net, ifm->ifi_index); 4955 if (!dev) { 4956 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4957 return -ENODEV; 4958 } 4959 4960 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 4961 if (br_spec) { 4962 nla_for_each_nested(attr, br_spec, rem) { 4963 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 4964 if (nla_len(attr) < sizeof(flags)) 4965 return -EINVAL; 4966 4967 have_flags = true; 4968 flags = nla_get_u16(attr); 4969 break; 4970 } 4971 } 4972 } 4973 4974 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 4975 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4976 4977 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 4978 err = -EOPNOTSUPP; 4979 goto out; 4980 } 4981 4982 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 4983 if (err) 4984 goto out; 4985 4986 flags &= ~BRIDGE_FLAGS_MASTER; 4987 } 4988 4989 if ((flags & BRIDGE_FLAGS_SELF)) { 4990 if (!dev->netdev_ops->ndo_bridge_dellink) 4991 err = -EOPNOTSUPP; 4992 else 4993 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 4994 flags); 4995 4996 if (!err) { 4997 flags &= ~BRIDGE_FLAGS_SELF; 4998 4999 /* Generate event to notify upper layer of bridge 5000 * change 5001 */ 5002 err = rtnl_bridge_notify(dev); 5003 } 5004 } 5005 5006 if (have_flags) 5007 memcpy(nla_data(attr), &flags, sizeof(flags)); 5008 out: 5009 return err; 5010 } 5011 5012 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr) 5013 { 5014 return (mask & IFLA_STATS_FILTER_BIT(attrid)) && 5015 (!idxattr || idxattr == attrid); 5016 } 5017 5018 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1) 5019 static int rtnl_get_offload_stats_attr_size(int attr_id) 5020 { 5021 switch (attr_id) { 5022 case IFLA_OFFLOAD_XSTATS_CPU_HIT: 5023 return sizeof(struct rtnl_link_stats64); 5024 } 5025 5026 return 0; 5027 } 5028 5029 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev, 5030 int *prividx) 5031 { 5032 struct nlattr *attr = NULL; 5033 int attr_id, size; 5034 void *attr_data; 5035 int err; 5036 5037 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 5038 dev->netdev_ops->ndo_get_offload_stats)) 5039 return -ENODATA; 5040 5041 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 5042 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 5043 if (attr_id < *prividx) 5044 continue; 5045 5046 size = rtnl_get_offload_stats_attr_size(attr_id); 5047 if (!size) 5048 continue; 5049 5050 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 5051 continue; 5052 5053 attr = nla_reserve_64bit(skb, attr_id, size, 5054 IFLA_OFFLOAD_XSTATS_UNSPEC); 5055 if (!attr) 5056 goto nla_put_failure; 5057 5058 attr_data = nla_data(attr); 5059 memset(attr_data, 0, size); 5060 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, 5061 attr_data); 5062 if (err) 5063 goto get_offload_stats_failure; 5064 } 5065 5066 if (!attr) 5067 return -ENODATA; 5068 5069 *prividx = 0; 5070 return 0; 5071 5072 nla_put_failure: 5073 err = -EMSGSIZE; 5074 get_offload_stats_failure: 5075 *prividx = attr_id; 5076 return err; 5077 } 5078 5079 static int rtnl_get_offload_stats_size(const struct net_device *dev) 5080 { 5081 int nla_size = 0; 5082 int attr_id; 5083 int size; 5084 5085 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 5086 dev->netdev_ops->ndo_get_offload_stats)) 5087 return 0; 5088 5089 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 5090 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 5091 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 5092 continue; 5093 size = rtnl_get_offload_stats_attr_size(attr_id); 5094 nla_size += nla_total_size_64bit(size); 5095 } 5096 5097 if (nla_size != 0) 5098 nla_size += nla_total_size(0); 5099 5100 return nla_size; 5101 } 5102 5103 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, 5104 int type, u32 pid, u32 seq, u32 change, 5105 unsigned int flags, unsigned int filter_mask, 5106 int *idxattr, int *prividx) 5107 { 5108 struct if_stats_msg *ifsm; 5109 struct nlmsghdr *nlh; 5110 struct nlattr *attr; 5111 int s_prividx = *prividx; 5112 int err; 5113 5114 ASSERT_RTNL(); 5115 5116 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags); 5117 if (!nlh) 5118 return -EMSGSIZE; 5119 5120 ifsm = nlmsg_data(nlh); 5121 ifsm->family = PF_UNSPEC; 5122 ifsm->pad1 = 0; 5123 ifsm->pad2 = 0; 5124 ifsm->ifindex = dev->ifindex; 5125 ifsm->filter_mask = filter_mask; 5126 5127 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) { 5128 struct rtnl_link_stats64 *sp; 5129 5130 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64, 5131 sizeof(struct rtnl_link_stats64), 5132 IFLA_STATS_UNSPEC); 5133 if (!attr) 5134 goto nla_put_failure; 5135 5136 sp = nla_data(attr); 5137 dev_get_stats(dev, sp); 5138 } 5139 5140 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) { 5141 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 5142 5143 if (ops && ops->fill_linkxstats) { 5144 *idxattr = IFLA_STATS_LINK_XSTATS; 5145 attr = nla_nest_start_noflag(skb, 5146 IFLA_STATS_LINK_XSTATS); 5147 if (!attr) 5148 goto nla_put_failure; 5149 5150 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 5151 nla_nest_end(skb, attr); 5152 if (err) 5153 goto nla_put_failure; 5154 *idxattr = 0; 5155 } 5156 } 5157 5158 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 5159 *idxattr)) { 5160 const struct rtnl_link_ops *ops = NULL; 5161 const struct net_device *master; 5162 5163 master = netdev_master_upper_dev_get(dev); 5164 if (master) 5165 ops = master->rtnl_link_ops; 5166 if (ops && ops->fill_linkxstats) { 5167 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE; 5168 attr = nla_nest_start_noflag(skb, 5169 IFLA_STATS_LINK_XSTATS_SLAVE); 5170 if (!attr) 5171 goto nla_put_failure; 5172 5173 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 5174 nla_nest_end(skb, attr); 5175 if (err) 5176 goto nla_put_failure; 5177 *idxattr = 0; 5178 } 5179 } 5180 5181 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 5182 *idxattr)) { 5183 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS; 5184 attr = nla_nest_start_noflag(skb, 5185 IFLA_STATS_LINK_OFFLOAD_XSTATS); 5186 if (!attr) 5187 goto nla_put_failure; 5188 5189 err = rtnl_get_offload_stats(skb, dev, prividx); 5190 if (err == -ENODATA) 5191 nla_nest_cancel(skb, attr); 5192 else 5193 nla_nest_end(skb, attr); 5194 5195 if (err && err != -ENODATA) 5196 goto nla_put_failure; 5197 *idxattr = 0; 5198 } 5199 5200 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) { 5201 struct rtnl_af_ops *af_ops; 5202 5203 *idxattr = IFLA_STATS_AF_SPEC; 5204 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC); 5205 if (!attr) 5206 goto nla_put_failure; 5207 5208 rcu_read_lock(); 5209 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 5210 if (af_ops->fill_stats_af) { 5211 struct nlattr *af; 5212 int err; 5213 5214 af = nla_nest_start_noflag(skb, 5215 af_ops->family); 5216 if (!af) { 5217 rcu_read_unlock(); 5218 goto nla_put_failure; 5219 } 5220 err = af_ops->fill_stats_af(skb, dev); 5221 5222 if (err == -ENODATA) { 5223 nla_nest_cancel(skb, af); 5224 } else if (err < 0) { 5225 rcu_read_unlock(); 5226 goto nla_put_failure; 5227 } 5228 5229 nla_nest_end(skb, af); 5230 } 5231 } 5232 rcu_read_unlock(); 5233 5234 nla_nest_end(skb, attr); 5235 5236 *idxattr = 0; 5237 } 5238 5239 nlmsg_end(skb, nlh); 5240 5241 return 0; 5242 5243 nla_put_failure: 5244 /* not a multi message or no progress mean a real error */ 5245 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx) 5246 nlmsg_cancel(skb, nlh); 5247 else 5248 nlmsg_end(skb, nlh); 5249 5250 return -EMSGSIZE; 5251 } 5252 5253 static size_t if_nlmsg_stats_size(const struct net_device *dev, 5254 u32 filter_mask) 5255 { 5256 size_t size = 0; 5257 5258 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0)) 5259 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64)); 5260 5261 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) { 5262 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 5263 int attr = IFLA_STATS_LINK_XSTATS; 5264 5265 if (ops && ops->get_linkxstats_size) { 5266 size += nla_total_size(ops->get_linkxstats_size(dev, 5267 attr)); 5268 /* for IFLA_STATS_LINK_XSTATS */ 5269 size += nla_total_size(0); 5270 } 5271 } 5272 5273 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) { 5274 struct net_device *_dev = (struct net_device *)dev; 5275 const struct rtnl_link_ops *ops = NULL; 5276 const struct net_device *master; 5277 5278 /* netdev_master_upper_dev_get can't take const */ 5279 master = netdev_master_upper_dev_get(_dev); 5280 if (master) 5281 ops = master->rtnl_link_ops; 5282 if (ops && ops->get_linkxstats_size) { 5283 int attr = IFLA_STATS_LINK_XSTATS_SLAVE; 5284 5285 size += nla_total_size(ops->get_linkxstats_size(dev, 5286 attr)); 5287 /* for IFLA_STATS_LINK_XSTATS_SLAVE */ 5288 size += nla_total_size(0); 5289 } 5290 } 5291 5292 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) 5293 size += rtnl_get_offload_stats_size(dev); 5294 5295 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) { 5296 struct rtnl_af_ops *af_ops; 5297 5298 /* for IFLA_STATS_AF_SPEC */ 5299 size += nla_total_size(0); 5300 5301 rcu_read_lock(); 5302 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 5303 if (af_ops->get_stats_af_size) { 5304 size += nla_total_size( 5305 af_ops->get_stats_af_size(dev)); 5306 5307 /* for AF_* */ 5308 size += nla_total_size(0); 5309 } 5310 } 5311 rcu_read_unlock(); 5312 } 5313 5314 return size; 5315 } 5316 5317 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check, 5318 bool is_dump, struct netlink_ext_ack *extack) 5319 { 5320 struct if_stats_msg *ifsm; 5321 5322 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) { 5323 NL_SET_ERR_MSG(extack, "Invalid header for stats dump"); 5324 return -EINVAL; 5325 } 5326 5327 if (!strict_check) 5328 return 0; 5329 5330 ifsm = nlmsg_data(nlh); 5331 5332 /* only requests using strict checks can pass data to influence 5333 * the dump. The legacy exception is filter_mask. 5334 */ 5335 if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) { 5336 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request"); 5337 return -EINVAL; 5338 } 5339 if (nlmsg_attrlen(nlh, sizeof(*ifsm))) { 5340 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header"); 5341 return -EINVAL; 5342 } 5343 if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) { 5344 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask"); 5345 return -EINVAL; 5346 } 5347 5348 return 0; 5349 } 5350 5351 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh, 5352 struct netlink_ext_ack *extack) 5353 { 5354 struct net *net = sock_net(skb->sk); 5355 struct net_device *dev = NULL; 5356 int idxattr = 0, prividx = 0; 5357 struct if_stats_msg *ifsm; 5358 struct sk_buff *nskb; 5359 u32 filter_mask; 5360 int err; 5361 5362 err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb), 5363 false, extack); 5364 if (err) 5365 return err; 5366 5367 ifsm = nlmsg_data(nlh); 5368 if (ifsm->ifindex > 0) 5369 dev = __dev_get_by_index(net, ifsm->ifindex); 5370 else 5371 return -EINVAL; 5372 5373 if (!dev) 5374 return -ENODEV; 5375 5376 filter_mask = ifsm->filter_mask; 5377 if (!filter_mask) 5378 return -EINVAL; 5379 5380 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL); 5381 if (!nskb) 5382 return -ENOBUFS; 5383 5384 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS, 5385 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 5386 0, filter_mask, &idxattr, &prividx); 5387 if (err < 0) { 5388 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */ 5389 WARN_ON(err == -EMSGSIZE); 5390 kfree_skb(nskb); 5391 } else { 5392 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 5393 } 5394 5395 return err; 5396 } 5397 5398 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb) 5399 { 5400 struct netlink_ext_ack *extack = cb->extack; 5401 int h, s_h, err, s_idx, s_idxattr, s_prividx; 5402 struct net *net = sock_net(skb->sk); 5403 unsigned int flags = NLM_F_MULTI; 5404 struct if_stats_msg *ifsm; 5405 struct hlist_head *head; 5406 struct net_device *dev; 5407 u32 filter_mask = 0; 5408 int idx = 0; 5409 5410 s_h = cb->args[0]; 5411 s_idx = cb->args[1]; 5412 s_idxattr = cb->args[2]; 5413 s_prividx = cb->args[3]; 5414 5415 cb->seq = net->dev_base_seq; 5416 5417 err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack); 5418 if (err) 5419 return err; 5420 5421 ifsm = nlmsg_data(cb->nlh); 5422 filter_mask = ifsm->filter_mask; 5423 if (!filter_mask) { 5424 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump"); 5425 return -EINVAL; 5426 } 5427 5428 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5429 idx = 0; 5430 head = &net->dev_index_head[h]; 5431 hlist_for_each_entry(dev, head, index_hlist) { 5432 if (idx < s_idx) 5433 goto cont; 5434 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 5435 NETLINK_CB(cb->skb).portid, 5436 cb->nlh->nlmsg_seq, 0, 5437 flags, filter_mask, 5438 &s_idxattr, &s_prividx); 5439 /* If we ran out of room on the first message, 5440 * we're in trouble 5441 */ 5442 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 5443 5444 if (err < 0) 5445 goto out; 5446 s_prividx = 0; 5447 s_idxattr = 0; 5448 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5449 cont: 5450 idx++; 5451 } 5452 } 5453 out: 5454 cb->args[3] = s_prividx; 5455 cb->args[2] = s_idxattr; 5456 cb->args[1] = idx; 5457 cb->args[0] = h; 5458 5459 return skb->len; 5460 } 5461 5462 /* Process one rtnetlink message. */ 5463 5464 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 5465 struct netlink_ext_ack *extack) 5466 { 5467 struct net *net = sock_net(skb->sk); 5468 struct rtnl_link *link; 5469 struct module *owner; 5470 int err = -EOPNOTSUPP; 5471 rtnl_doit_func doit; 5472 unsigned int flags; 5473 int kind; 5474 int family; 5475 int type; 5476 5477 type = nlh->nlmsg_type; 5478 if (type > RTM_MAX) 5479 return -EOPNOTSUPP; 5480 5481 type -= RTM_BASE; 5482 5483 /* All the messages must have at least 1 byte length */ 5484 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 5485 return 0; 5486 5487 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 5488 kind = type&3; 5489 5490 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 5491 return -EPERM; 5492 5493 rcu_read_lock(); 5494 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 5495 struct sock *rtnl; 5496 rtnl_dumpit_func dumpit; 5497 u32 min_dump_alloc = 0; 5498 5499 link = rtnl_get_link(family, type); 5500 if (!link || !link->dumpit) { 5501 family = PF_UNSPEC; 5502 link = rtnl_get_link(family, type); 5503 if (!link || !link->dumpit) 5504 goto err_unlock; 5505 } 5506 owner = link->owner; 5507 dumpit = link->dumpit; 5508 5509 if (type == RTM_GETLINK - RTM_BASE) 5510 min_dump_alloc = rtnl_calcit(skb, nlh); 5511 5512 err = 0; 5513 /* need to do this before rcu_read_unlock() */ 5514 if (!try_module_get(owner)) 5515 err = -EPROTONOSUPPORT; 5516 5517 rcu_read_unlock(); 5518 5519 rtnl = net->rtnl; 5520 if (err == 0) { 5521 struct netlink_dump_control c = { 5522 .dump = dumpit, 5523 .min_dump_alloc = min_dump_alloc, 5524 .module = owner, 5525 }; 5526 err = netlink_dump_start(rtnl, skb, nlh, &c); 5527 /* netlink_dump_start() will keep a reference on 5528 * module if dump is still in progress. 5529 */ 5530 module_put(owner); 5531 } 5532 return err; 5533 } 5534 5535 link = rtnl_get_link(family, type); 5536 if (!link || !link->doit) { 5537 family = PF_UNSPEC; 5538 link = rtnl_get_link(PF_UNSPEC, type); 5539 if (!link || !link->doit) 5540 goto out_unlock; 5541 } 5542 5543 owner = link->owner; 5544 if (!try_module_get(owner)) { 5545 err = -EPROTONOSUPPORT; 5546 goto out_unlock; 5547 } 5548 5549 flags = link->flags; 5550 if (flags & RTNL_FLAG_DOIT_UNLOCKED) { 5551 doit = link->doit; 5552 rcu_read_unlock(); 5553 if (doit) 5554 err = doit(skb, nlh, extack); 5555 module_put(owner); 5556 return err; 5557 } 5558 rcu_read_unlock(); 5559 5560 rtnl_lock(); 5561 link = rtnl_get_link(family, type); 5562 if (link && link->doit) 5563 err = link->doit(skb, nlh, extack); 5564 rtnl_unlock(); 5565 5566 module_put(owner); 5567 5568 return err; 5569 5570 out_unlock: 5571 rcu_read_unlock(); 5572 return err; 5573 5574 err_unlock: 5575 rcu_read_unlock(); 5576 return -EOPNOTSUPP; 5577 } 5578 5579 static void rtnetlink_rcv(struct sk_buff *skb) 5580 { 5581 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 5582 } 5583 5584 static int rtnetlink_bind(struct net *net, int group) 5585 { 5586 switch (group) { 5587 case RTNLGRP_IPV4_MROUTE_R: 5588 case RTNLGRP_IPV6_MROUTE_R: 5589 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 5590 return -EPERM; 5591 break; 5592 } 5593 return 0; 5594 } 5595 5596 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 5597 { 5598 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 5599 5600 switch (event) { 5601 case NETDEV_REBOOT: 5602 case NETDEV_CHANGEMTU: 5603 case NETDEV_CHANGEADDR: 5604 case NETDEV_CHANGENAME: 5605 case NETDEV_FEAT_CHANGE: 5606 case NETDEV_BONDING_FAILOVER: 5607 case NETDEV_POST_TYPE_CHANGE: 5608 case NETDEV_NOTIFY_PEERS: 5609 case NETDEV_CHANGEUPPER: 5610 case NETDEV_RESEND_IGMP: 5611 case NETDEV_CHANGEINFODATA: 5612 case NETDEV_CHANGELOWERSTATE: 5613 case NETDEV_CHANGE_TX_QUEUE_LEN: 5614 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event), 5615 GFP_KERNEL, NULL, 0); 5616 break; 5617 default: 5618 break; 5619 } 5620 return NOTIFY_DONE; 5621 } 5622 5623 static struct notifier_block rtnetlink_dev_notifier = { 5624 .notifier_call = rtnetlink_event, 5625 }; 5626 5627 5628 static int __net_init rtnetlink_net_init(struct net *net) 5629 { 5630 struct sock *sk; 5631 struct netlink_kernel_cfg cfg = { 5632 .groups = RTNLGRP_MAX, 5633 .input = rtnetlink_rcv, 5634 .cb_mutex = &rtnl_mutex, 5635 .flags = NL_CFG_F_NONROOT_RECV, 5636 .bind = rtnetlink_bind, 5637 }; 5638 5639 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 5640 if (!sk) 5641 return -ENOMEM; 5642 net->rtnl = sk; 5643 return 0; 5644 } 5645 5646 static void __net_exit rtnetlink_net_exit(struct net *net) 5647 { 5648 netlink_kernel_release(net->rtnl); 5649 net->rtnl = NULL; 5650 } 5651 5652 static struct pernet_operations rtnetlink_net_ops = { 5653 .init = rtnetlink_net_init, 5654 .exit = rtnetlink_net_exit, 5655 }; 5656 5657 void __init rtnetlink_init(void) 5658 { 5659 if (register_pernet_subsys(&rtnetlink_net_ops)) 5660 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 5661 5662 register_netdevice_notifier(&rtnetlink_dev_notifier); 5663 5664 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 5665 rtnl_dump_ifinfo, 0); 5666 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0); 5667 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0); 5668 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0); 5669 5670 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0); 5671 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0); 5672 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0); 5673 5674 rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0); 5675 rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0); 5676 5677 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0); 5678 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0); 5679 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0); 5680 5681 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0); 5682 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0); 5683 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0); 5684 5685 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump, 5686 0); 5687 } 5688