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 #include <net/devlink.h> 57 #if IS_ENABLED(CONFIG_IPV6) 58 #include <net/addrconf.h> 59 #endif 60 61 #include "dev.h" 62 63 #define RTNL_MAX_TYPE 50 64 #define RTNL_SLAVE_MAX_TYPE 43 65 66 struct rtnl_link { 67 rtnl_doit_func doit; 68 rtnl_dumpit_func dumpit; 69 struct module *owner; 70 unsigned int flags; 71 struct rcu_head rcu; 72 }; 73 74 static DEFINE_MUTEX(rtnl_mutex); 75 76 void rtnl_lock(void) 77 { 78 mutex_lock(&rtnl_mutex); 79 } 80 EXPORT_SYMBOL(rtnl_lock); 81 82 int rtnl_lock_killable(void) 83 { 84 return mutex_lock_killable(&rtnl_mutex); 85 } 86 EXPORT_SYMBOL(rtnl_lock_killable); 87 88 static struct sk_buff *defer_kfree_skb_list; 89 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail) 90 { 91 if (head && tail) { 92 tail->next = defer_kfree_skb_list; 93 defer_kfree_skb_list = head; 94 } 95 } 96 EXPORT_SYMBOL(rtnl_kfree_skbs); 97 98 void __rtnl_unlock(void) 99 { 100 struct sk_buff *head = defer_kfree_skb_list; 101 102 defer_kfree_skb_list = NULL; 103 104 /* Ensure that we didn't actually add any TODO item when __rtnl_unlock() 105 * is used. In some places, e.g. in cfg80211, we have code that will do 106 * something like 107 * rtnl_lock() 108 * wiphy_lock() 109 * ... 110 * rtnl_unlock() 111 * 112 * and because netdev_run_todo() acquires the RTNL for items on the list 113 * we could cause a situation such as this: 114 * Thread 1 Thread 2 115 * rtnl_lock() 116 * unregister_netdevice() 117 * __rtnl_unlock() 118 * rtnl_lock() 119 * wiphy_lock() 120 * rtnl_unlock() 121 * netdev_run_todo() 122 * __rtnl_unlock() 123 * 124 * // list not empty now 125 * // because of thread 2 126 * rtnl_lock() 127 * while (!list_empty(...)) 128 * rtnl_lock() 129 * wiphy_lock() 130 * **** DEADLOCK **** 131 * 132 * However, usage of __rtnl_unlock() is rare, and so we can ensure that 133 * it's not used in cases where something is added to do the list. 134 */ 135 WARN_ON(!list_empty(&net_todo_list)); 136 137 mutex_unlock(&rtnl_mutex); 138 139 while (head) { 140 struct sk_buff *next = head->next; 141 142 kfree_skb(head); 143 cond_resched(); 144 head = next; 145 } 146 } 147 148 void rtnl_unlock(void) 149 { 150 /* This fellow will unlock it for us. */ 151 netdev_run_todo(); 152 } 153 EXPORT_SYMBOL(rtnl_unlock); 154 155 int rtnl_trylock(void) 156 { 157 return mutex_trylock(&rtnl_mutex); 158 } 159 EXPORT_SYMBOL(rtnl_trylock); 160 161 int rtnl_is_locked(void) 162 { 163 return mutex_is_locked(&rtnl_mutex); 164 } 165 EXPORT_SYMBOL(rtnl_is_locked); 166 167 bool refcount_dec_and_rtnl_lock(refcount_t *r) 168 { 169 return refcount_dec_and_mutex_lock(r, &rtnl_mutex); 170 } 171 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock); 172 173 #ifdef CONFIG_PROVE_LOCKING 174 bool lockdep_rtnl_is_held(void) 175 { 176 return lockdep_is_held(&rtnl_mutex); 177 } 178 EXPORT_SYMBOL(lockdep_rtnl_is_held); 179 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 180 181 static struct rtnl_link __rcu *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 182 183 static inline int rtm_msgindex(int msgtype) 184 { 185 int msgindex = msgtype - RTM_BASE; 186 187 /* 188 * msgindex < 0 implies someone tried to register a netlink 189 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 190 * the message type has not been added to linux/rtnetlink.h 191 */ 192 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 193 194 return msgindex; 195 } 196 197 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype) 198 { 199 struct rtnl_link __rcu **tab; 200 201 if (protocol >= ARRAY_SIZE(rtnl_msg_handlers)) 202 protocol = PF_UNSPEC; 203 204 tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]); 205 if (!tab) 206 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]); 207 208 return rcu_dereference_rtnl(tab[msgtype]); 209 } 210 211 static int rtnl_register_internal(struct module *owner, 212 int protocol, int msgtype, 213 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 214 unsigned int flags) 215 { 216 struct rtnl_link *link, *old; 217 struct rtnl_link __rcu **tab; 218 int msgindex; 219 int ret = -ENOBUFS; 220 221 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 222 msgindex = rtm_msgindex(msgtype); 223 224 rtnl_lock(); 225 tab = rtnl_dereference(rtnl_msg_handlers[protocol]); 226 if (tab == NULL) { 227 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL); 228 if (!tab) 229 goto unlock; 230 231 /* ensures we see the 0 stores */ 232 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab); 233 } 234 235 old = rtnl_dereference(tab[msgindex]); 236 if (old) { 237 link = kmemdup(old, sizeof(*old), GFP_KERNEL); 238 if (!link) 239 goto unlock; 240 } else { 241 link = kzalloc(sizeof(*link), GFP_KERNEL); 242 if (!link) 243 goto unlock; 244 } 245 246 WARN_ON(link->owner && link->owner != owner); 247 link->owner = owner; 248 249 WARN_ON(doit && link->doit && link->doit != doit); 250 if (doit) 251 link->doit = doit; 252 WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit); 253 if (dumpit) 254 link->dumpit = dumpit; 255 256 WARN_ON(rtnl_msgtype_kind(msgtype) != RTNL_KIND_DEL && 257 (flags & RTNL_FLAG_BULK_DEL_SUPPORTED)); 258 link->flags |= flags; 259 260 /* publish protocol:msgtype */ 261 rcu_assign_pointer(tab[msgindex], link); 262 ret = 0; 263 if (old) 264 kfree_rcu(old, rcu); 265 unlock: 266 rtnl_unlock(); 267 return ret; 268 } 269 270 /** 271 * rtnl_register_module - Register a rtnetlink message type 272 * 273 * @owner: module registering the hook (THIS_MODULE) 274 * @protocol: Protocol family or PF_UNSPEC 275 * @msgtype: rtnetlink message type 276 * @doit: Function pointer called for each request message 277 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 278 * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions 279 * 280 * Like rtnl_register, but for use by removable modules. 281 */ 282 int rtnl_register_module(struct module *owner, 283 int protocol, int msgtype, 284 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 285 unsigned int flags) 286 { 287 return rtnl_register_internal(owner, protocol, msgtype, 288 doit, dumpit, flags); 289 } 290 EXPORT_SYMBOL_GPL(rtnl_register_module); 291 292 /** 293 * rtnl_register - Register a rtnetlink message type 294 * @protocol: Protocol family or PF_UNSPEC 295 * @msgtype: rtnetlink message type 296 * @doit: Function pointer called for each request message 297 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 298 * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions 299 * 300 * Registers the specified function pointers (at least one of them has 301 * to be non-NULL) to be called whenever a request message for the 302 * specified protocol family and message type is received. 303 * 304 * The special protocol family PF_UNSPEC may be used to define fallback 305 * function pointers for the case when no entry for the specific protocol 306 * family exists. 307 */ 308 void rtnl_register(int protocol, int msgtype, 309 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 310 unsigned int flags) 311 { 312 int err; 313 314 err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit, 315 flags); 316 if (err) 317 pr_err("Unable to register rtnetlink message handler, " 318 "protocol = %d, message type = %d\n", protocol, msgtype); 319 } 320 321 /** 322 * rtnl_unregister - Unregister a rtnetlink message type 323 * @protocol: Protocol family or PF_UNSPEC 324 * @msgtype: rtnetlink message type 325 * 326 * Returns 0 on success or a negative error code. 327 */ 328 int rtnl_unregister(int protocol, int msgtype) 329 { 330 struct rtnl_link __rcu **tab; 331 struct rtnl_link *link; 332 int msgindex; 333 334 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 335 msgindex = rtm_msgindex(msgtype); 336 337 rtnl_lock(); 338 tab = rtnl_dereference(rtnl_msg_handlers[protocol]); 339 if (!tab) { 340 rtnl_unlock(); 341 return -ENOENT; 342 } 343 344 link = rtnl_dereference(tab[msgindex]); 345 RCU_INIT_POINTER(tab[msgindex], NULL); 346 rtnl_unlock(); 347 348 kfree_rcu(link, rcu); 349 350 return 0; 351 } 352 EXPORT_SYMBOL_GPL(rtnl_unregister); 353 354 /** 355 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 356 * @protocol : Protocol family or PF_UNSPEC 357 * 358 * Identical to calling rtnl_unregster() for all registered message types 359 * of a certain protocol family. 360 */ 361 void rtnl_unregister_all(int protocol) 362 { 363 struct rtnl_link __rcu **tab; 364 struct rtnl_link *link; 365 int msgindex; 366 367 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 368 369 rtnl_lock(); 370 tab = rtnl_dereference(rtnl_msg_handlers[protocol]); 371 if (!tab) { 372 rtnl_unlock(); 373 return; 374 } 375 RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL); 376 for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) { 377 link = rtnl_dereference(tab[msgindex]); 378 if (!link) 379 continue; 380 381 RCU_INIT_POINTER(tab[msgindex], NULL); 382 kfree_rcu(link, rcu); 383 } 384 rtnl_unlock(); 385 386 synchronize_net(); 387 388 kfree(tab); 389 } 390 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 391 392 static LIST_HEAD(link_ops); 393 394 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 395 { 396 const struct rtnl_link_ops *ops; 397 398 list_for_each_entry(ops, &link_ops, list) { 399 if (!strcmp(ops->kind, kind)) 400 return ops; 401 } 402 return NULL; 403 } 404 405 /** 406 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 407 * @ops: struct rtnl_link_ops * to register 408 * 409 * The caller must hold the rtnl_mutex. This function should be used 410 * by drivers that create devices during module initialization. It 411 * must be called before registering the devices. 412 * 413 * Returns 0 on success or a negative error code. 414 */ 415 int __rtnl_link_register(struct rtnl_link_ops *ops) 416 { 417 if (rtnl_link_ops_get(ops->kind)) 418 return -EEXIST; 419 420 /* The check for alloc/setup is here because if ops 421 * does not have that filled up, it is not possible 422 * to use the ops for creating device. So do not 423 * fill up dellink as well. That disables rtnl_dellink. 424 */ 425 if ((ops->alloc || ops->setup) && !ops->dellink) 426 ops->dellink = unregister_netdevice_queue; 427 428 list_add_tail(&ops->list, &link_ops); 429 return 0; 430 } 431 EXPORT_SYMBOL_GPL(__rtnl_link_register); 432 433 /** 434 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 435 * @ops: struct rtnl_link_ops * to register 436 * 437 * Returns 0 on success or a negative error code. 438 */ 439 int rtnl_link_register(struct rtnl_link_ops *ops) 440 { 441 int err; 442 443 /* Sanity-check max sizes to avoid stack buffer overflow. */ 444 if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE || 445 ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)) 446 return -EINVAL; 447 448 rtnl_lock(); 449 err = __rtnl_link_register(ops); 450 rtnl_unlock(); 451 return err; 452 } 453 EXPORT_SYMBOL_GPL(rtnl_link_register); 454 455 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 456 { 457 struct net_device *dev; 458 LIST_HEAD(list_kill); 459 460 for_each_netdev(net, dev) { 461 if (dev->rtnl_link_ops == ops) 462 ops->dellink(dev, &list_kill); 463 } 464 unregister_netdevice_many(&list_kill); 465 } 466 467 /** 468 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 469 * @ops: struct rtnl_link_ops * to unregister 470 * 471 * The caller must hold the rtnl_mutex and guarantee net_namespace_list 472 * integrity (hold pernet_ops_rwsem for writing to close the race 473 * with setup_net() and cleanup_net()). 474 */ 475 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 476 { 477 struct net *net; 478 479 for_each_net(net) { 480 __rtnl_kill_links(net, ops); 481 } 482 list_del(&ops->list); 483 } 484 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 485 486 /* Return with the rtnl_lock held when there are no network 487 * devices unregistering in any network namespace. 488 */ 489 static void rtnl_lock_unregistering_all(void) 490 { 491 struct net *net; 492 bool unregistering; 493 DEFINE_WAIT_FUNC(wait, woken_wake_function); 494 495 add_wait_queue(&netdev_unregistering_wq, &wait); 496 for (;;) { 497 unregistering = false; 498 rtnl_lock(); 499 /* We held write locked pernet_ops_rwsem, and parallel 500 * setup_net() and cleanup_net() are not possible. 501 */ 502 for_each_net(net) { 503 if (atomic_read(&net->dev_unreg_count) > 0) { 504 unregistering = true; 505 break; 506 } 507 } 508 if (!unregistering) 509 break; 510 __rtnl_unlock(); 511 512 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 513 } 514 remove_wait_queue(&netdev_unregistering_wq, &wait); 515 } 516 517 /** 518 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 519 * @ops: struct rtnl_link_ops * to unregister 520 */ 521 void rtnl_link_unregister(struct rtnl_link_ops *ops) 522 { 523 /* Close the race with setup_net() and cleanup_net() */ 524 down_write(&pernet_ops_rwsem); 525 rtnl_lock_unregistering_all(); 526 __rtnl_link_unregister(ops); 527 rtnl_unlock(); 528 up_write(&pernet_ops_rwsem); 529 } 530 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 531 532 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 533 { 534 struct net_device *master_dev; 535 const struct rtnl_link_ops *ops; 536 size_t size = 0; 537 538 rcu_read_lock(); 539 540 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev); 541 if (!master_dev) 542 goto out; 543 544 ops = master_dev->rtnl_link_ops; 545 if (!ops || !ops->get_slave_size) 546 goto out; 547 /* IFLA_INFO_SLAVE_DATA + nested data */ 548 size = nla_total_size(sizeof(struct nlattr)) + 549 ops->get_slave_size(master_dev, dev); 550 551 out: 552 rcu_read_unlock(); 553 return size; 554 } 555 556 static size_t rtnl_link_get_size(const struct net_device *dev) 557 { 558 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 559 size_t size; 560 561 if (!ops) 562 return 0; 563 564 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 565 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 566 567 if (ops->get_size) 568 /* IFLA_INFO_DATA + nested data */ 569 size += nla_total_size(sizeof(struct nlattr)) + 570 ops->get_size(dev); 571 572 if (ops->get_xstats_size) 573 /* IFLA_INFO_XSTATS */ 574 size += nla_total_size(ops->get_xstats_size(dev)); 575 576 size += rtnl_link_get_slave_info_data_size(dev); 577 578 return size; 579 } 580 581 static LIST_HEAD(rtnl_af_ops); 582 583 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 584 { 585 const struct rtnl_af_ops *ops; 586 587 ASSERT_RTNL(); 588 589 list_for_each_entry(ops, &rtnl_af_ops, list) { 590 if (ops->family == family) 591 return ops; 592 } 593 594 return NULL; 595 } 596 597 /** 598 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 599 * @ops: struct rtnl_af_ops * to register 600 * 601 * Returns 0 on success or a negative error code. 602 */ 603 void rtnl_af_register(struct rtnl_af_ops *ops) 604 { 605 rtnl_lock(); 606 list_add_tail_rcu(&ops->list, &rtnl_af_ops); 607 rtnl_unlock(); 608 } 609 EXPORT_SYMBOL_GPL(rtnl_af_register); 610 611 /** 612 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 613 * @ops: struct rtnl_af_ops * to unregister 614 */ 615 void rtnl_af_unregister(struct rtnl_af_ops *ops) 616 { 617 rtnl_lock(); 618 list_del_rcu(&ops->list); 619 rtnl_unlock(); 620 621 synchronize_rcu(); 622 } 623 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 624 625 static size_t rtnl_link_get_af_size(const struct net_device *dev, 626 u32 ext_filter_mask) 627 { 628 struct rtnl_af_ops *af_ops; 629 size_t size; 630 631 /* IFLA_AF_SPEC */ 632 size = nla_total_size(sizeof(struct nlattr)); 633 634 rcu_read_lock(); 635 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 636 if (af_ops->get_link_af_size) { 637 /* AF_* + nested data */ 638 size += nla_total_size(sizeof(struct nlattr)) + 639 af_ops->get_link_af_size(dev, ext_filter_mask); 640 } 641 } 642 rcu_read_unlock(); 643 644 return size; 645 } 646 647 static bool rtnl_have_link_slave_info(const struct net_device *dev) 648 { 649 struct net_device *master_dev; 650 bool ret = false; 651 652 rcu_read_lock(); 653 654 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev); 655 if (master_dev && master_dev->rtnl_link_ops) 656 ret = true; 657 rcu_read_unlock(); 658 return ret; 659 } 660 661 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 662 const struct net_device *dev) 663 { 664 struct net_device *master_dev; 665 const struct rtnl_link_ops *ops; 666 struct nlattr *slave_data; 667 int err; 668 669 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 670 if (!master_dev) 671 return 0; 672 ops = master_dev->rtnl_link_ops; 673 if (!ops) 674 return 0; 675 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 676 return -EMSGSIZE; 677 if (ops->fill_slave_info) { 678 slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA); 679 if (!slave_data) 680 return -EMSGSIZE; 681 err = ops->fill_slave_info(skb, master_dev, dev); 682 if (err < 0) 683 goto err_cancel_slave_data; 684 nla_nest_end(skb, slave_data); 685 } 686 return 0; 687 688 err_cancel_slave_data: 689 nla_nest_cancel(skb, slave_data); 690 return err; 691 } 692 693 static int rtnl_link_info_fill(struct sk_buff *skb, 694 const struct net_device *dev) 695 { 696 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 697 struct nlattr *data; 698 int err; 699 700 if (!ops) 701 return 0; 702 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 703 return -EMSGSIZE; 704 if (ops->fill_xstats) { 705 err = ops->fill_xstats(skb, dev); 706 if (err < 0) 707 return err; 708 } 709 if (ops->fill_info) { 710 data = nla_nest_start_noflag(skb, IFLA_INFO_DATA); 711 if (data == NULL) 712 return -EMSGSIZE; 713 err = ops->fill_info(skb, dev); 714 if (err < 0) 715 goto err_cancel_data; 716 nla_nest_end(skb, data); 717 } 718 return 0; 719 720 err_cancel_data: 721 nla_nest_cancel(skb, data); 722 return err; 723 } 724 725 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 726 { 727 struct nlattr *linkinfo; 728 int err = -EMSGSIZE; 729 730 linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO); 731 if (linkinfo == NULL) 732 goto out; 733 734 err = rtnl_link_info_fill(skb, dev); 735 if (err < 0) 736 goto err_cancel_link; 737 738 err = rtnl_link_slave_info_fill(skb, dev); 739 if (err < 0) 740 goto err_cancel_link; 741 742 nla_nest_end(skb, linkinfo); 743 return 0; 744 745 err_cancel_link: 746 nla_nest_cancel(skb, linkinfo); 747 out: 748 return err; 749 } 750 751 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 752 { 753 struct sock *rtnl = net->rtnl; 754 755 return nlmsg_notify(rtnl, skb, pid, group, echo, GFP_KERNEL); 756 } 757 758 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 759 { 760 struct sock *rtnl = net->rtnl; 761 762 return nlmsg_unicast(rtnl, skb, pid); 763 } 764 EXPORT_SYMBOL(rtnl_unicast); 765 766 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 767 const struct nlmsghdr *nlh, gfp_t flags) 768 { 769 struct sock *rtnl = net->rtnl; 770 771 nlmsg_notify(rtnl, skb, pid, group, nlmsg_report(nlh), flags); 772 } 773 EXPORT_SYMBOL(rtnl_notify); 774 775 void rtnl_set_sk_err(struct net *net, u32 group, int error) 776 { 777 struct sock *rtnl = net->rtnl; 778 779 netlink_set_err(rtnl, 0, group, error); 780 } 781 EXPORT_SYMBOL(rtnl_set_sk_err); 782 783 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 784 { 785 struct nlattr *mx; 786 int i, valid = 0; 787 788 /* nothing is dumped for dst_default_metrics, so just skip the loop */ 789 if (metrics == dst_default_metrics.metrics) 790 return 0; 791 792 mx = nla_nest_start_noflag(skb, RTA_METRICS); 793 if (mx == NULL) 794 return -ENOBUFS; 795 796 for (i = 0; i < RTAX_MAX; i++) { 797 if (metrics[i]) { 798 if (i == RTAX_CC_ALGO - 1) { 799 char tmp[TCP_CA_NAME_MAX], *name; 800 801 name = tcp_ca_get_name_by_key(metrics[i], tmp); 802 if (!name) 803 continue; 804 if (nla_put_string(skb, i + 1, name)) 805 goto nla_put_failure; 806 } else if (i == RTAX_FEATURES - 1) { 807 u32 user_features = metrics[i] & RTAX_FEATURE_MASK; 808 809 if (!user_features) 810 continue; 811 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); 812 if (nla_put_u32(skb, i + 1, user_features)) 813 goto nla_put_failure; 814 } else { 815 if (nla_put_u32(skb, i + 1, metrics[i])) 816 goto nla_put_failure; 817 } 818 valid++; 819 } 820 } 821 822 if (!valid) { 823 nla_nest_cancel(skb, mx); 824 return 0; 825 } 826 827 return nla_nest_end(skb, mx); 828 829 nla_put_failure: 830 nla_nest_cancel(skb, mx); 831 return -EMSGSIZE; 832 } 833 EXPORT_SYMBOL(rtnetlink_put_metrics); 834 835 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 836 long expires, u32 error) 837 { 838 struct rta_cacheinfo ci = { 839 .rta_error = error, 840 .rta_id = id, 841 }; 842 843 if (dst) { 844 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse); 845 ci.rta_used = dst->__use; 846 ci.rta_clntref = rcuref_read(&dst->__rcuref); 847 } 848 if (expires) { 849 unsigned long clock; 850 851 clock = jiffies_to_clock_t(abs(expires)); 852 clock = min_t(unsigned long, clock, INT_MAX); 853 ci.rta_expires = (expires > 0) ? clock : -clock; 854 } 855 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 856 } 857 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 858 859 static void set_operstate(struct net_device *dev, unsigned char transition) 860 { 861 unsigned char operstate = dev->operstate; 862 863 switch (transition) { 864 case IF_OPER_UP: 865 if ((operstate == IF_OPER_DORMANT || 866 operstate == IF_OPER_TESTING || 867 operstate == IF_OPER_UNKNOWN) && 868 !netif_dormant(dev) && !netif_testing(dev)) 869 operstate = IF_OPER_UP; 870 break; 871 872 case IF_OPER_TESTING: 873 if (netif_oper_up(dev)) 874 operstate = IF_OPER_TESTING; 875 break; 876 877 case IF_OPER_DORMANT: 878 if (netif_oper_up(dev)) 879 operstate = IF_OPER_DORMANT; 880 break; 881 } 882 883 if (dev->operstate != operstate) { 884 write_lock(&dev_base_lock); 885 dev->operstate = operstate; 886 write_unlock(&dev_base_lock); 887 netdev_state_change(dev); 888 } 889 } 890 891 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 892 { 893 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 894 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 895 } 896 897 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 898 const struct ifinfomsg *ifm) 899 { 900 unsigned int flags = ifm->ifi_flags; 901 902 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 903 if (ifm->ifi_change) 904 flags = (flags & ifm->ifi_change) | 905 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 906 907 return flags; 908 } 909 910 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 911 const struct rtnl_link_stats64 *b) 912 { 913 a->rx_packets = b->rx_packets; 914 a->tx_packets = b->tx_packets; 915 a->rx_bytes = b->rx_bytes; 916 a->tx_bytes = b->tx_bytes; 917 a->rx_errors = b->rx_errors; 918 a->tx_errors = b->tx_errors; 919 a->rx_dropped = b->rx_dropped; 920 a->tx_dropped = b->tx_dropped; 921 922 a->multicast = b->multicast; 923 a->collisions = b->collisions; 924 925 a->rx_length_errors = b->rx_length_errors; 926 a->rx_over_errors = b->rx_over_errors; 927 a->rx_crc_errors = b->rx_crc_errors; 928 a->rx_frame_errors = b->rx_frame_errors; 929 a->rx_fifo_errors = b->rx_fifo_errors; 930 a->rx_missed_errors = b->rx_missed_errors; 931 932 a->tx_aborted_errors = b->tx_aborted_errors; 933 a->tx_carrier_errors = b->tx_carrier_errors; 934 a->tx_fifo_errors = b->tx_fifo_errors; 935 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 936 a->tx_window_errors = b->tx_window_errors; 937 938 a->rx_compressed = b->rx_compressed; 939 a->tx_compressed = b->tx_compressed; 940 941 a->rx_nohandler = b->rx_nohandler; 942 } 943 944 /* All VF info */ 945 static inline int rtnl_vfinfo_size(const struct net_device *dev, 946 u32 ext_filter_mask) 947 { 948 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) { 949 int num_vfs = dev_num_vf(dev->dev.parent); 950 size_t size = nla_total_size(0); 951 size += num_vfs * 952 (nla_total_size(0) + 953 nla_total_size(sizeof(struct ifla_vf_mac)) + 954 nla_total_size(sizeof(struct ifla_vf_broadcast)) + 955 nla_total_size(sizeof(struct ifla_vf_vlan)) + 956 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */ 957 nla_total_size(MAX_VLAN_LIST_LEN * 958 sizeof(struct ifla_vf_vlan_info)) + 959 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 960 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 961 nla_total_size(sizeof(struct ifla_vf_rate)) + 962 nla_total_size(sizeof(struct ifla_vf_link_state)) + 963 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 964 nla_total_size(0) + /* nest IFLA_VF_STATS */ 965 /* IFLA_VF_STATS_RX_PACKETS */ 966 nla_total_size_64bit(sizeof(__u64)) + 967 /* IFLA_VF_STATS_TX_PACKETS */ 968 nla_total_size_64bit(sizeof(__u64)) + 969 /* IFLA_VF_STATS_RX_BYTES */ 970 nla_total_size_64bit(sizeof(__u64)) + 971 /* IFLA_VF_STATS_TX_BYTES */ 972 nla_total_size_64bit(sizeof(__u64)) + 973 /* IFLA_VF_STATS_BROADCAST */ 974 nla_total_size_64bit(sizeof(__u64)) + 975 /* IFLA_VF_STATS_MULTICAST */ 976 nla_total_size_64bit(sizeof(__u64)) + 977 /* IFLA_VF_STATS_RX_DROPPED */ 978 nla_total_size_64bit(sizeof(__u64)) + 979 /* IFLA_VF_STATS_TX_DROPPED */ 980 nla_total_size_64bit(sizeof(__u64)) + 981 nla_total_size(sizeof(struct ifla_vf_trust))); 982 return size; 983 } else 984 return 0; 985 } 986 987 static size_t rtnl_port_size(const struct net_device *dev, 988 u32 ext_filter_mask) 989 { 990 size_t port_size = nla_total_size(4) /* PORT_VF */ 991 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 992 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 993 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 994 + nla_total_size(1) /* PROT_VDP_REQUEST */ 995 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 996 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 997 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 998 + port_size; 999 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 1000 + port_size; 1001 1002 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 1003 !(ext_filter_mask & RTEXT_FILTER_VF)) 1004 return 0; 1005 if (dev_num_vf(dev->dev.parent)) 1006 return port_self_size + vf_ports_size + 1007 vf_port_size * dev_num_vf(dev->dev.parent); 1008 else 1009 return port_self_size; 1010 } 1011 1012 static size_t rtnl_xdp_size(void) 1013 { 1014 size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */ 1015 nla_total_size(1) + /* XDP_ATTACHED */ 1016 nla_total_size(4) + /* XDP_PROG_ID (or 1st mode) */ 1017 nla_total_size(4); /* XDP_<mode>_PROG_ID */ 1018 1019 return xdp_size; 1020 } 1021 1022 static size_t rtnl_prop_list_size(const struct net_device *dev) 1023 { 1024 struct netdev_name_node *name_node; 1025 size_t size; 1026 1027 if (list_empty(&dev->name_node->list)) 1028 return 0; 1029 size = nla_total_size(0); 1030 list_for_each_entry(name_node, &dev->name_node->list, list) 1031 size += nla_total_size(ALTIFNAMSIZ); 1032 return size; 1033 } 1034 1035 static size_t rtnl_proto_down_size(const struct net_device *dev) 1036 { 1037 size_t size = nla_total_size(1); 1038 1039 if (dev->proto_down_reason) 1040 size += nla_total_size(0) + nla_total_size(4); 1041 1042 return size; 1043 } 1044 1045 static size_t rtnl_devlink_port_size(const struct net_device *dev) 1046 { 1047 size_t size = nla_total_size(0); /* nest IFLA_DEVLINK_PORT */ 1048 1049 if (dev->devlink_port) 1050 size += devlink_nl_port_handle_size(dev->devlink_port); 1051 1052 return size; 1053 } 1054 1055 static noinline size_t if_nlmsg_size(const struct net_device *dev, 1056 u32 ext_filter_mask) 1057 { 1058 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 1059 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 1060 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 1061 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 1062 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap)) 1063 + nla_total_size(sizeof(struct rtnl_link_stats)) 1064 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64)) 1065 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 1066 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 1067 + nla_total_size(4) /* IFLA_TXQLEN */ 1068 + nla_total_size(4) /* IFLA_WEIGHT */ 1069 + nla_total_size(4) /* IFLA_MTU */ 1070 + nla_total_size(4) /* IFLA_LINK */ 1071 + nla_total_size(4) /* IFLA_MASTER */ 1072 + nla_total_size(1) /* IFLA_CARRIER */ 1073 + nla_total_size(4) /* IFLA_PROMISCUITY */ 1074 + nla_total_size(4) /* IFLA_ALLMULTI */ 1075 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 1076 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 1077 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */ 1078 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */ 1079 + nla_total_size(4) /* IFLA_GRO_MAX_SIZE */ 1080 + nla_total_size(4) /* IFLA_GSO_IPV4_MAX_SIZE */ 1081 + nla_total_size(4) /* IFLA_GRO_IPV4_MAX_SIZE */ 1082 + nla_total_size(4) /* IFLA_TSO_MAX_SIZE */ 1083 + nla_total_size(4) /* IFLA_TSO_MAX_SEGS */ 1084 + nla_total_size(1) /* IFLA_OPERSTATE */ 1085 + nla_total_size(1) /* IFLA_LINKMODE */ 1086 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 1087 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 1088 + nla_total_size(4) /* IFLA_GROUP */ 1089 + nla_total_size(ext_filter_mask 1090 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 1091 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 1092 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 1093 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 1094 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 1095 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 1096 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 1097 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */ 1098 + rtnl_xdp_size() /* IFLA_XDP */ 1099 + nla_total_size(4) /* IFLA_EVENT */ 1100 + nla_total_size(4) /* IFLA_NEW_NETNSID */ 1101 + nla_total_size(4) /* IFLA_NEW_IFINDEX */ 1102 + rtnl_proto_down_size(dev) /* proto down */ 1103 + nla_total_size(4) /* IFLA_TARGET_NETNSID */ 1104 + nla_total_size(4) /* IFLA_CARRIER_UP_COUNT */ 1105 + nla_total_size(4) /* IFLA_CARRIER_DOWN_COUNT */ 1106 + nla_total_size(4) /* IFLA_MIN_MTU */ 1107 + nla_total_size(4) /* IFLA_MAX_MTU */ 1108 + rtnl_prop_list_size(dev) 1109 + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */ 1110 + rtnl_devlink_port_size(dev) 1111 + 0; 1112 } 1113 1114 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 1115 { 1116 struct nlattr *vf_ports; 1117 struct nlattr *vf_port; 1118 int vf; 1119 int err; 1120 1121 vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS); 1122 if (!vf_ports) 1123 return -EMSGSIZE; 1124 1125 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 1126 vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT); 1127 if (!vf_port) 1128 goto nla_put_failure; 1129 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 1130 goto nla_put_failure; 1131 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 1132 if (err == -EMSGSIZE) 1133 goto nla_put_failure; 1134 if (err) { 1135 nla_nest_cancel(skb, vf_port); 1136 continue; 1137 } 1138 nla_nest_end(skb, vf_port); 1139 } 1140 1141 nla_nest_end(skb, vf_ports); 1142 1143 return 0; 1144 1145 nla_put_failure: 1146 nla_nest_cancel(skb, vf_ports); 1147 return -EMSGSIZE; 1148 } 1149 1150 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 1151 { 1152 struct nlattr *port_self; 1153 int err; 1154 1155 port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF); 1156 if (!port_self) 1157 return -EMSGSIZE; 1158 1159 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 1160 if (err) { 1161 nla_nest_cancel(skb, port_self); 1162 return (err == -EMSGSIZE) ? err : 0; 1163 } 1164 1165 nla_nest_end(skb, port_self); 1166 1167 return 0; 1168 } 1169 1170 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 1171 u32 ext_filter_mask) 1172 { 1173 int err; 1174 1175 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 1176 !(ext_filter_mask & RTEXT_FILTER_VF)) 1177 return 0; 1178 1179 err = rtnl_port_self_fill(skb, dev); 1180 if (err) 1181 return err; 1182 1183 if (dev_num_vf(dev->dev.parent)) { 1184 err = rtnl_vf_ports_fill(skb, dev); 1185 if (err) 1186 return err; 1187 } 1188 1189 return 0; 1190 } 1191 1192 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 1193 { 1194 int err; 1195 struct netdev_phys_item_id ppid; 1196 1197 err = dev_get_phys_port_id(dev, &ppid); 1198 if (err) { 1199 if (err == -EOPNOTSUPP) 1200 return 0; 1201 return err; 1202 } 1203 1204 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1205 return -EMSGSIZE; 1206 1207 return 0; 1208 } 1209 1210 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1211 { 1212 char name[IFNAMSIZ]; 1213 int err; 1214 1215 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1216 if (err) { 1217 if (err == -EOPNOTSUPP) 1218 return 0; 1219 return err; 1220 } 1221 1222 if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name)) 1223 return -EMSGSIZE; 1224 1225 return 0; 1226 } 1227 1228 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1229 { 1230 struct netdev_phys_item_id ppid = { }; 1231 int err; 1232 1233 err = dev_get_port_parent_id(dev, &ppid, false); 1234 if (err) { 1235 if (err == -EOPNOTSUPP) 1236 return 0; 1237 return err; 1238 } 1239 1240 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id)) 1241 return -EMSGSIZE; 1242 1243 return 0; 1244 } 1245 1246 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1247 struct net_device *dev) 1248 { 1249 struct rtnl_link_stats64 *sp; 1250 struct nlattr *attr; 1251 1252 attr = nla_reserve_64bit(skb, IFLA_STATS64, 1253 sizeof(struct rtnl_link_stats64), IFLA_PAD); 1254 if (!attr) 1255 return -EMSGSIZE; 1256 1257 sp = nla_data(attr); 1258 dev_get_stats(dev, sp); 1259 1260 attr = nla_reserve(skb, IFLA_STATS, 1261 sizeof(struct rtnl_link_stats)); 1262 if (!attr) 1263 return -EMSGSIZE; 1264 1265 copy_rtnl_link_stats(nla_data(attr), sp); 1266 1267 return 0; 1268 } 1269 1270 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1271 struct net_device *dev, 1272 int vfs_num, 1273 struct nlattr *vfinfo) 1274 { 1275 struct ifla_vf_rss_query_en vf_rss_query_en; 1276 struct nlattr *vf, *vfstats, *vfvlanlist; 1277 struct ifla_vf_link_state vf_linkstate; 1278 struct ifla_vf_vlan_info vf_vlan_info; 1279 struct ifla_vf_spoofchk vf_spoofchk; 1280 struct ifla_vf_tx_rate vf_tx_rate; 1281 struct ifla_vf_stats vf_stats; 1282 struct ifla_vf_trust vf_trust; 1283 struct ifla_vf_vlan vf_vlan; 1284 struct ifla_vf_rate vf_rate; 1285 struct ifla_vf_mac vf_mac; 1286 struct ifla_vf_broadcast vf_broadcast; 1287 struct ifla_vf_info ivi; 1288 struct ifla_vf_guid node_guid; 1289 struct ifla_vf_guid port_guid; 1290 1291 memset(&ivi, 0, sizeof(ivi)); 1292 1293 /* Not all SR-IOV capable drivers support the 1294 * spoofcheck and "RSS query enable" query. Preset to 1295 * -1 so the user space tool can detect that the driver 1296 * didn't report anything. 1297 */ 1298 ivi.spoofchk = -1; 1299 ivi.rss_query_en = -1; 1300 ivi.trusted = -1; 1301 /* The default value for VF link state is "auto" 1302 * IFLA_VF_LINK_STATE_AUTO which equals zero 1303 */ 1304 ivi.linkstate = 0; 1305 /* VLAN Protocol by default is 802.1Q */ 1306 ivi.vlan_proto = htons(ETH_P_8021Q); 1307 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1308 return 0; 1309 1310 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info)); 1311 memset(&node_guid, 0, sizeof(node_guid)); 1312 memset(&port_guid, 0, sizeof(port_guid)); 1313 1314 vf_mac.vf = 1315 vf_vlan.vf = 1316 vf_vlan_info.vf = 1317 vf_rate.vf = 1318 vf_tx_rate.vf = 1319 vf_spoofchk.vf = 1320 vf_linkstate.vf = 1321 vf_rss_query_en.vf = 1322 vf_trust.vf = 1323 node_guid.vf = 1324 port_guid.vf = ivi.vf; 1325 1326 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1327 memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len); 1328 vf_vlan.vlan = ivi.vlan; 1329 vf_vlan.qos = ivi.qos; 1330 vf_vlan_info.vlan = ivi.vlan; 1331 vf_vlan_info.qos = ivi.qos; 1332 vf_vlan_info.vlan_proto = ivi.vlan_proto; 1333 vf_tx_rate.rate = ivi.max_tx_rate; 1334 vf_rate.min_tx_rate = ivi.min_tx_rate; 1335 vf_rate.max_tx_rate = ivi.max_tx_rate; 1336 vf_spoofchk.setting = ivi.spoofchk; 1337 vf_linkstate.link_state = ivi.linkstate; 1338 vf_rss_query_en.setting = ivi.rss_query_en; 1339 vf_trust.setting = ivi.trusted; 1340 vf = nla_nest_start_noflag(skb, IFLA_VF_INFO); 1341 if (!vf) 1342 goto nla_put_vfinfo_failure; 1343 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1344 nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) || 1345 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1346 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1347 &vf_rate) || 1348 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1349 &vf_tx_rate) || 1350 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1351 &vf_spoofchk) || 1352 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1353 &vf_linkstate) || 1354 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1355 sizeof(vf_rss_query_en), 1356 &vf_rss_query_en) || 1357 nla_put(skb, IFLA_VF_TRUST, 1358 sizeof(vf_trust), &vf_trust)) 1359 goto nla_put_vf_failure; 1360 1361 if (dev->netdev_ops->ndo_get_vf_guid && 1362 !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid, 1363 &port_guid)) { 1364 if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid), 1365 &node_guid) || 1366 nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid), 1367 &port_guid)) 1368 goto nla_put_vf_failure; 1369 } 1370 vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST); 1371 if (!vfvlanlist) 1372 goto nla_put_vf_failure; 1373 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info), 1374 &vf_vlan_info)) { 1375 nla_nest_cancel(skb, vfvlanlist); 1376 goto nla_put_vf_failure; 1377 } 1378 nla_nest_end(skb, vfvlanlist); 1379 memset(&vf_stats, 0, sizeof(vf_stats)); 1380 if (dev->netdev_ops->ndo_get_vf_stats) 1381 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1382 &vf_stats); 1383 vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS); 1384 if (!vfstats) 1385 goto nla_put_vf_failure; 1386 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS, 1387 vf_stats.rx_packets, IFLA_VF_STATS_PAD) || 1388 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS, 1389 vf_stats.tx_packets, IFLA_VF_STATS_PAD) || 1390 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES, 1391 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) || 1392 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES, 1393 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) || 1394 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST, 1395 vf_stats.broadcast, IFLA_VF_STATS_PAD) || 1396 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST, 1397 vf_stats.multicast, IFLA_VF_STATS_PAD) || 1398 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED, 1399 vf_stats.rx_dropped, IFLA_VF_STATS_PAD) || 1400 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED, 1401 vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) { 1402 nla_nest_cancel(skb, vfstats); 1403 goto nla_put_vf_failure; 1404 } 1405 nla_nest_end(skb, vfstats); 1406 nla_nest_end(skb, vf); 1407 return 0; 1408 1409 nla_put_vf_failure: 1410 nla_nest_cancel(skb, vf); 1411 nla_put_vfinfo_failure: 1412 nla_nest_cancel(skb, vfinfo); 1413 return -EMSGSIZE; 1414 } 1415 1416 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb, 1417 struct net_device *dev, 1418 u32 ext_filter_mask) 1419 { 1420 struct nlattr *vfinfo; 1421 int i, num_vfs; 1422 1423 if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0)) 1424 return 0; 1425 1426 num_vfs = dev_num_vf(dev->dev.parent); 1427 if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs)) 1428 return -EMSGSIZE; 1429 1430 if (!dev->netdev_ops->ndo_get_vf_config) 1431 return 0; 1432 1433 vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST); 1434 if (!vfinfo) 1435 return -EMSGSIZE; 1436 1437 for (i = 0; i < num_vfs; i++) { 1438 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1439 return -EMSGSIZE; 1440 } 1441 1442 nla_nest_end(skb, vfinfo); 1443 return 0; 1444 } 1445 1446 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1447 { 1448 struct rtnl_link_ifmap map; 1449 1450 memset(&map, 0, sizeof(map)); 1451 map.mem_start = dev->mem_start; 1452 map.mem_end = dev->mem_end; 1453 map.base_addr = dev->base_addr; 1454 map.irq = dev->irq; 1455 map.dma = dev->dma; 1456 map.port = dev->if_port; 1457 1458 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD)) 1459 return -EMSGSIZE; 1460 1461 return 0; 1462 } 1463 1464 static u32 rtnl_xdp_prog_skb(struct net_device *dev) 1465 { 1466 const struct bpf_prog *generic_xdp_prog; 1467 1468 ASSERT_RTNL(); 1469 1470 generic_xdp_prog = rtnl_dereference(dev->xdp_prog); 1471 if (!generic_xdp_prog) 1472 return 0; 1473 return generic_xdp_prog->aux->id; 1474 } 1475 1476 static u32 rtnl_xdp_prog_drv(struct net_device *dev) 1477 { 1478 return dev_xdp_prog_id(dev, XDP_MODE_DRV); 1479 } 1480 1481 static u32 rtnl_xdp_prog_hw(struct net_device *dev) 1482 { 1483 return dev_xdp_prog_id(dev, XDP_MODE_HW); 1484 } 1485 1486 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev, 1487 u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr, 1488 u32 (*get_prog_id)(struct net_device *dev)) 1489 { 1490 u32 curr_id; 1491 int err; 1492 1493 curr_id = get_prog_id(dev); 1494 if (!curr_id) 1495 return 0; 1496 1497 *prog_id = curr_id; 1498 err = nla_put_u32(skb, attr, curr_id); 1499 if (err) 1500 return err; 1501 1502 if (*mode != XDP_ATTACHED_NONE) 1503 *mode = XDP_ATTACHED_MULTI; 1504 else 1505 *mode = tgt_mode; 1506 1507 return 0; 1508 } 1509 1510 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev) 1511 { 1512 struct nlattr *xdp; 1513 u32 prog_id; 1514 int err; 1515 u8 mode; 1516 1517 xdp = nla_nest_start_noflag(skb, IFLA_XDP); 1518 if (!xdp) 1519 return -EMSGSIZE; 1520 1521 prog_id = 0; 1522 mode = XDP_ATTACHED_NONE; 1523 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB, 1524 IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb); 1525 if (err) 1526 goto err_cancel; 1527 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV, 1528 IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv); 1529 if (err) 1530 goto err_cancel; 1531 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW, 1532 IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw); 1533 if (err) 1534 goto err_cancel; 1535 1536 err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode); 1537 if (err) 1538 goto err_cancel; 1539 1540 if (prog_id && mode != XDP_ATTACHED_MULTI) { 1541 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id); 1542 if (err) 1543 goto err_cancel; 1544 } 1545 1546 nla_nest_end(skb, xdp); 1547 return 0; 1548 1549 err_cancel: 1550 nla_nest_cancel(skb, xdp); 1551 return err; 1552 } 1553 1554 static u32 rtnl_get_event(unsigned long event) 1555 { 1556 u32 rtnl_event_type = IFLA_EVENT_NONE; 1557 1558 switch (event) { 1559 case NETDEV_REBOOT: 1560 rtnl_event_type = IFLA_EVENT_REBOOT; 1561 break; 1562 case NETDEV_FEAT_CHANGE: 1563 rtnl_event_type = IFLA_EVENT_FEATURES; 1564 break; 1565 case NETDEV_BONDING_FAILOVER: 1566 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER; 1567 break; 1568 case NETDEV_NOTIFY_PEERS: 1569 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS; 1570 break; 1571 case NETDEV_RESEND_IGMP: 1572 rtnl_event_type = IFLA_EVENT_IGMP_RESEND; 1573 break; 1574 case NETDEV_CHANGEINFODATA: 1575 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS; 1576 break; 1577 default: 1578 break; 1579 } 1580 1581 return rtnl_event_type; 1582 } 1583 1584 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev) 1585 { 1586 const struct net_device *upper_dev; 1587 int ret = 0; 1588 1589 rcu_read_lock(); 1590 1591 upper_dev = netdev_master_upper_dev_get_rcu(dev); 1592 if (upper_dev) 1593 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex); 1594 1595 rcu_read_unlock(); 1596 return ret; 1597 } 1598 1599 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev, 1600 bool force) 1601 { 1602 int ifindex = dev_get_iflink(dev); 1603 1604 if (force || dev->ifindex != ifindex) 1605 return nla_put_u32(skb, IFLA_LINK, ifindex); 1606 1607 return 0; 1608 } 1609 1610 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb, 1611 struct net_device *dev) 1612 { 1613 char buf[IFALIASZ]; 1614 int ret; 1615 1616 ret = dev_get_alias(dev, buf, sizeof(buf)); 1617 return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0; 1618 } 1619 1620 static int rtnl_fill_link_netnsid(struct sk_buff *skb, 1621 const struct net_device *dev, 1622 struct net *src_net, gfp_t gfp) 1623 { 1624 bool put_iflink = false; 1625 1626 if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) { 1627 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1628 1629 if (!net_eq(dev_net(dev), link_net)) { 1630 int id = peernet2id_alloc(src_net, link_net, gfp); 1631 1632 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1633 return -EMSGSIZE; 1634 1635 put_iflink = true; 1636 } 1637 } 1638 1639 return nla_put_iflink(skb, dev, put_iflink); 1640 } 1641 1642 static int rtnl_fill_link_af(struct sk_buff *skb, 1643 const struct net_device *dev, 1644 u32 ext_filter_mask) 1645 { 1646 const struct rtnl_af_ops *af_ops; 1647 struct nlattr *af_spec; 1648 1649 af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC); 1650 if (!af_spec) 1651 return -EMSGSIZE; 1652 1653 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 1654 struct nlattr *af; 1655 int err; 1656 1657 if (!af_ops->fill_link_af) 1658 continue; 1659 1660 af = nla_nest_start_noflag(skb, af_ops->family); 1661 if (!af) 1662 return -EMSGSIZE; 1663 1664 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1665 /* 1666 * Caller may return ENODATA to indicate that there 1667 * was no data to be dumped. This is not an error, it 1668 * means we should trim the attribute header and 1669 * continue. 1670 */ 1671 if (err == -ENODATA) 1672 nla_nest_cancel(skb, af); 1673 else if (err < 0) 1674 return -EMSGSIZE; 1675 1676 nla_nest_end(skb, af); 1677 } 1678 1679 nla_nest_end(skb, af_spec); 1680 return 0; 1681 } 1682 1683 static int rtnl_fill_alt_ifnames(struct sk_buff *skb, 1684 const struct net_device *dev) 1685 { 1686 struct netdev_name_node *name_node; 1687 int count = 0; 1688 1689 list_for_each_entry(name_node, &dev->name_node->list, list) { 1690 if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name)) 1691 return -EMSGSIZE; 1692 count++; 1693 } 1694 return count; 1695 } 1696 1697 static int rtnl_fill_prop_list(struct sk_buff *skb, 1698 const struct net_device *dev) 1699 { 1700 struct nlattr *prop_list; 1701 int ret; 1702 1703 prop_list = nla_nest_start(skb, IFLA_PROP_LIST); 1704 if (!prop_list) 1705 return -EMSGSIZE; 1706 1707 ret = rtnl_fill_alt_ifnames(skb, dev); 1708 if (ret <= 0) 1709 goto nest_cancel; 1710 1711 nla_nest_end(skb, prop_list); 1712 return 0; 1713 1714 nest_cancel: 1715 nla_nest_cancel(skb, prop_list); 1716 return ret; 1717 } 1718 1719 static int rtnl_fill_proto_down(struct sk_buff *skb, 1720 const struct net_device *dev) 1721 { 1722 struct nlattr *pr; 1723 u32 preason; 1724 1725 if (nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1726 goto nla_put_failure; 1727 1728 preason = dev->proto_down_reason; 1729 if (!preason) 1730 return 0; 1731 1732 pr = nla_nest_start(skb, IFLA_PROTO_DOWN_REASON); 1733 if (!pr) 1734 return -EMSGSIZE; 1735 1736 if (nla_put_u32(skb, IFLA_PROTO_DOWN_REASON_VALUE, preason)) { 1737 nla_nest_cancel(skb, pr); 1738 goto nla_put_failure; 1739 } 1740 1741 nla_nest_end(skb, pr); 1742 return 0; 1743 1744 nla_put_failure: 1745 return -EMSGSIZE; 1746 } 1747 1748 static int rtnl_fill_devlink_port(struct sk_buff *skb, 1749 const struct net_device *dev) 1750 { 1751 struct nlattr *devlink_port_nest; 1752 int ret; 1753 1754 devlink_port_nest = nla_nest_start(skb, IFLA_DEVLINK_PORT); 1755 if (!devlink_port_nest) 1756 return -EMSGSIZE; 1757 1758 if (dev->devlink_port) { 1759 ret = devlink_nl_port_handle_fill(skb, dev->devlink_port); 1760 if (ret < 0) 1761 goto nest_cancel; 1762 } 1763 1764 nla_nest_end(skb, devlink_port_nest); 1765 return 0; 1766 1767 nest_cancel: 1768 nla_nest_cancel(skb, devlink_port_nest); 1769 return ret; 1770 } 1771 1772 static int rtnl_fill_ifinfo(struct sk_buff *skb, 1773 struct net_device *dev, struct net *src_net, 1774 int type, u32 pid, u32 seq, u32 change, 1775 unsigned int flags, u32 ext_filter_mask, 1776 u32 event, int *new_nsid, int new_ifindex, 1777 int tgt_netnsid, gfp_t gfp) 1778 { 1779 struct ifinfomsg *ifm; 1780 struct nlmsghdr *nlh; 1781 struct Qdisc *qdisc; 1782 1783 ASSERT_RTNL(); 1784 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1785 if (nlh == NULL) 1786 return -EMSGSIZE; 1787 1788 ifm = nlmsg_data(nlh); 1789 ifm->ifi_family = AF_UNSPEC; 1790 ifm->__ifi_pad = 0; 1791 ifm->ifi_type = dev->type; 1792 ifm->ifi_index = dev->ifindex; 1793 ifm->ifi_flags = dev_get_flags(dev); 1794 ifm->ifi_change = change; 1795 1796 if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid)) 1797 goto nla_put_failure; 1798 1799 qdisc = rtnl_dereference(dev->qdisc); 1800 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1801 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1802 nla_put_u8(skb, IFLA_OPERSTATE, 1803 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1804 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1805 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1806 nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) || 1807 nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) || 1808 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1809 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1810 nla_put_u32(skb, IFLA_ALLMULTI, dev->allmulti) || 1811 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1812 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) || 1813 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) || 1814 nla_put_u32(skb, IFLA_GRO_MAX_SIZE, dev->gro_max_size) || 1815 nla_put_u32(skb, IFLA_GSO_IPV4_MAX_SIZE, dev->gso_ipv4_max_size) || 1816 nla_put_u32(skb, IFLA_GRO_IPV4_MAX_SIZE, dev->gro_ipv4_max_size) || 1817 nla_put_u32(skb, IFLA_TSO_MAX_SIZE, dev->tso_max_size) || 1818 nla_put_u32(skb, IFLA_TSO_MAX_SEGS, dev->tso_max_segs) || 1819 #ifdef CONFIG_RPS 1820 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1821 #endif 1822 put_master_ifindex(skb, dev) || 1823 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1824 (qdisc && 1825 nla_put_string(skb, IFLA_QDISC, qdisc->ops->id)) || 1826 nla_put_ifalias(skb, dev) || 1827 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1828 atomic_read(&dev->carrier_up_count) + 1829 atomic_read(&dev->carrier_down_count)) || 1830 nla_put_u32(skb, IFLA_CARRIER_UP_COUNT, 1831 atomic_read(&dev->carrier_up_count)) || 1832 nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT, 1833 atomic_read(&dev->carrier_down_count))) 1834 goto nla_put_failure; 1835 1836 if (rtnl_fill_proto_down(skb, dev)) 1837 goto nla_put_failure; 1838 1839 if (event != IFLA_EVENT_NONE) { 1840 if (nla_put_u32(skb, IFLA_EVENT, event)) 1841 goto nla_put_failure; 1842 } 1843 1844 if (rtnl_fill_link_ifmap(skb, dev)) 1845 goto nla_put_failure; 1846 1847 if (dev->addr_len) { 1848 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1849 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1850 goto nla_put_failure; 1851 } 1852 1853 if (rtnl_phys_port_id_fill(skb, dev)) 1854 goto nla_put_failure; 1855 1856 if (rtnl_phys_port_name_fill(skb, dev)) 1857 goto nla_put_failure; 1858 1859 if (rtnl_phys_switch_id_fill(skb, dev)) 1860 goto nla_put_failure; 1861 1862 if (rtnl_fill_stats(skb, dev)) 1863 goto nla_put_failure; 1864 1865 if (rtnl_fill_vf(skb, dev, ext_filter_mask)) 1866 goto nla_put_failure; 1867 1868 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1869 goto nla_put_failure; 1870 1871 if (rtnl_xdp_fill(skb, dev)) 1872 goto nla_put_failure; 1873 1874 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1875 if (rtnl_link_fill(skb, dev) < 0) 1876 goto nla_put_failure; 1877 } 1878 1879 if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp)) 1880 goto nla_put_failure; 1881 1882 if (new_nsid && 1883 nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0) 1884 goto nla_put_failure; 1885 if (new_ifindex && 1886 nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0) 1887 goto nla_put_failure; 1888 1889 if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) && 1890 nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr)) 1891 goto nla_put_failure; 1892 1893 rcu_read_lock(); 1894 if (rtnl_fill_link_af(skb, dev, ext_filter_mask)) 1895 goto nla_put_failure_rcu; 1896 rcu_read_unlock(); 1897 1898 if (rtnl_fill_prop_list(skb, dev)) 1899 goto nla_put_failure; 1900 1901 if (dev->dev.parent && 1902 nla_put_string(skb, IFLA_PARENT_DEV_NAME, 1903 dev_name(dev->dev.parent))) 1904 goto nla_put_failure; 1905 1906 if (dev->dev.parent && dev->dev.parent->bus && 1907 nla_put_string(skb, IFLA_PARENT_DEV_BUS_NAME, 1908 dev->dev.parent->bus->name)) 1909 goto nla_put_failure; 1910 1911 if (rtnl_fill_devlink_port(skb, dev)) 1912 goto nla_put_failure; 1913 1914 nlmsg_end(skb, nlh); 1915 return 0; 1916 1917 nla_put_failure_rcu: 1918 rcu_read_unlock(); 1919 nla_put_failure: 1920 nlmsg_cancel(skb, nlh); 1921 return -EMSGSIZE; 1922 } 1923 1924 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1925 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1926 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1927 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1928 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1929 [IFLA_MTU] = { .type = NLA_U32 }, 1930 [IFLA_LINK] = { .type = NLA_U32 }, 1931 [IFLA_MASTER] = { .type = NLA_U32 }, 1932 [IFLA_CARRIER] = { .type = NLA_U8 }, 1933 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1934 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1935 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1936 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1937 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1938 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1939 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1940 /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to 1941 * allow 0-length string (needed to remove an alias). 1942 */ 1943 [IFLA_IFALIAS] = { .type = NLA_BINARY, .len = IFALIASZ - 1 }, 1944 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1945 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1946 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1947 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1948 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1949 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1950 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1951 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1952 [IFLA_GSO_MAX_SEGS] = { .type = NLA_U32 }, 1953 [IFLA_GSO_MAX_SIZE] = { .type = NLA_U32 }, 1954 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1955 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1956 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1957 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1958 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1959 [IFLA_XDP] = { .type = NLA_NESTED }, 1960 [IFLA_EVENT] = { .type = NLA_U32 }, 1961 [IFLA_GROUP] = { .type = NLA_U32 }, 1962 [IFLA_TARGET_NETNSID] = { .type = NLA_S32 }, 1963 [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 }, 1964 [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 }, 1965 [IFLA_MIN_MTU] = { .type = NLA_U32 }, 1966 [IFLA_MAX_MTU] = { .type = NLA_U32 }, 1967 [IFLA_PROP_LIST] = { .type = NLA_NESTED }, 1968 [IFLA_ALT_IFNAME] = { .type = NLA_STRING, 1969 .len = ALTIFNAMSIZ - 1 }, 1970 [IFLA_PERM_ADDRESS] = { .type = NLA_REJECT }, 1971 [IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED }, 1972 [IFLA_NEW_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1), 1973 [IFLA_PARENT_DEV_NAME] = { .type = NLA_NUL_STRING }, 1974 [IFLA_GRO_MAX_SIZE] = { .type = NLA_U32 }, 1975 [IFLA_TSO_MAX_SIZE] = { .type = NLA_REJECT }, 1976 [IFLA_TSO_MAX_SEGS] = { .type = NLA_REJECT }, 1977 [IFLA_ALLMULTI] = { .type = NLA_REJECT }, 1978 [IFLA_GSO_IPV4_MAX_SIZE] = { .type = NLA_U32 }, 1979 [IFLA_GRO_IPV4_MAX_SIZE] = { .type = NLA_U32 }, 1980 }; 1981 1982 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1983 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1984 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1985 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1986 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1987 }; 1988 1989 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1990 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1991 [IFLA_VF_BROADCAST] = { .type = NLA_REJECT }, 1992 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1993 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED }, 1994 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1995 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1996 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1997 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1998 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1999 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 2000 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 2001 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 2002 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 2003 }; 2004 2005 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 2006 [IFLA_PORT_VF] = { .type = NLA_U32 }, 2007 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 2008 .len = PORT_PROFILE_MAX }, 2009 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 2010 .len = PORT_UUID_MAX }, 2011 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 2012 .len = PORT_UUID_MAX }, 2013 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 2014 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 2015 2016 /* Unused, but we need to keep it here since user space could 2017 * fill it. It's also broken with regard to NLA_BINARY use in 2018 * combination with structs. 2019 */ 2020 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 2021 .len = sizeof(struct ifla_port_vsi) }, 2022 }; 2023 2024 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = { 2025 [IFLA_XDP_UNSPEC] = { .strict_start_type = IFLA_XDP_EXPECTED_FD }, 2026 [IFLA_XDP_FD] = { .type = NLA_S32 }, 2027 [IFLA_XDP_EXPECTED_FD] = { .type = NLA_S32 }, 2028 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 }, 2029 [IFLA_XDP_FLAGS] = { .type = NLA_U32 }, 2030 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 }, 2031 }; 2032 2033 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 2034 { 2035 const struct rtnl_link_ops *ops = NULL; 2036 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 2037 2038 if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0) 2039 return NULL; 2040 2041 if (linfo[IFLA_INFO_KIND]) { 2042 char kind[MODULE_NAME_LEN]; 2043 2044 nla_strscpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 2045 ops = rtnl_link_ops_get(kind); 2046 } 2047 2048 return ops; 2049 } 2050 2051 static bool link_master_filtered(struct net_device *dev, int master_idx) 2052 { 2053 struct net_device *master; 2054 2055 if (!master_idx) 2056 return false; 2057 2058 master = netdev_master_upper_dev_get(dev); 2059 2060 /* 0 is already used to denote IFLA_MASTER wasn't passed, therefore need 2061 * another invalid value for ifindex to denote "no master". 2062 */ 2063 if (master_idx == -1) 2064 return !!master; 2065 2066 if (!master || master->ifindex != master_idx) 2067 return true; 2068 2069 return false; 2070 } 2071 2072 static bool link_kind_filtered(const struct net_device *dev, 2073 const struct rtnl_link_ops *kind_ops) 2074 { 2075 if (kind_ops && dev->rtnl_link_ops != kind_ops) 2076 return true; 2077 2078 return false; 2079 } 2080 2081 static bool link_dump_filtered(struct net_device *dev, 2082 int master_idx, 2083 const struct rtnl_link_ops *kind_ops) 2084 { 2085 if (link_master_filtered(dev, master_idx) || 2086 link_kind_filtered(dev, kind_ops)) 2087 return true; 2088 2089 return false; 2090 } 2091 2092 /** 2093 * rtnl_get_net_ns_capable - Get netns if sufficiently privileged. 2094 * @sk: netlink socket 2095 * @netnsid: network namespace identifier 2096 * 2097 * Returns the network namespace identified by netnsid on success or an error 2098 * pointer on failure. 2099 */ 2100 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid) 2101 { 2102 struct net *net; 2103 2104 net = get_net_ns_by_id(sock_net(sk), netnsid); 2105 if (!net) 2106 return ERR_PTR(-EINVAL); 2107 2108 /* For now, the caller is required to have CAP_NET_ADMIN in 2109 * the user namespace owning the target net ns. 2110 */ 2111 if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) { 2112 put_net(net); 2113 return ERR_PTR(-EACCES); 2114 } 2115 return net; 2116 } 2117 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable); 2118 2119 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh, 2120 bool strict_check, struct nlattr **tb, 2121 struct netlink_ext_ack *extack) 2122 { 2123 int hdrlen; 2124 2125 if (strict_check) { 2126 struct ifinfomsg *ifm; 2127 2128 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 2129 NL_SET_ERR_MSG(extack, "Invalid header for link dump"); 2130 return -EINVAL; 2131 } 2132 2133 ifm = nlmsg_data(nlh); 2134 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 2135 ifm->ifi_change) { 2136 NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request"); 2137 return -EINVAL; 2138 } 2139 if (ifm->ifi_index) { 2140 NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps"); 2141 return -EINVAL; 2142 } 2143 2144 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, 2145 IFLA_MAX, ifla_policy, 2146 extack); 2147 } 2148 2149 /* A hack to preserve kernel<->userspace interface. 2150 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 2151 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 2152 * what iproute2 < v3.9.0 used. 2153 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 2154 * attribute, its netlink message is shorter than struct ifinfomsg. 2155 */ 2156 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2157 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2158 2159 return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, 2160 extack); 2161 } 2162 2163 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 2164 { 2165 struct netlink_ext_ack *extack = cb->extack; 2166 const struct nlmsghdr *nlh = cb->nlh; 2167 struct net *net = sock_net(skb->sk); 2168 struct net *tgt_net = net; 2169 int h, s_h; 2170 int idx = 0, s_idx; 2171 struct net_device *dev; 2172 struct hlist_head *head; 2173 struct nlattr *tb[IFLA_MAX+1]; 2174 u32 ext_filter_mask = 0; 2175 const struct rtnl_link_ops *kind_ops = NULL; 2176 unsigned int flags = NLM_F_MULTI; 2177 int master_idx = 0; 2178 int netnsid = -1; 2179 int err, i; 2180 2181 s_h = cb->args[0]; 2182 s_idx = cb->args[1]; 2183 2184 err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack); 2185 if (err < 0) { 2186 if (cb->strict_check) 2187 return err; 2188 2189 goto walk_entries; 2190 } 2191 2192 for (i = 0; i <= IFLA_MAX; ++i) { 2193 if (!tb[i]) 2194 continue; 2195 2196 /* new attributes should only be added with strict checking */ 2197 switch (i) { 2198 case IFLA_TARGET_NETNSID: 2199 netnsid = nla_get_s32(tb[i]); 2200 tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid); 2201 if (IS_ERR(tgt_net)) { 2202 NL_SET_ERR_MSG(extack, "Invalid target network namespace id"); 2203 return PTR_ERR(tgt_net); 2204 } 2205 break; 2206 case IFLA_EXT_MASK: 2207 ext_filter_mask = nla_get_u32(tb[i]); 2208 break; 2209 case IFLA_MASTER: 2210 master_idx = nla_get_u32(tb[i]); 2211 break; 2212 case IFLA_LINKINFO: 2213 kind_ops = linkinfo_to_kind_ops(tb[i]); 2214 break; 2215 default: 2216 if (cb->strict_check) { 2217 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request"); 2218 return -EINVAL; 2219 } 2220 } 2221 } 2222 2223 if (master_idx || kind_ops) 2224 flags |= NLM_F_DUMP_FILTERED; 2225 2226 walk_entries: 2227 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 2228 idx = 0; 2229 head = &tgt_net->dev_index_head[h]; 2230 hlist_for_each_entry(dev, head, index_hlist) { 2231 if (link_dump_filtered(dev, master_idx, kind_ops)) 2232 goto cont; 2233 if (idx < s_idx) 2234 goto cont; 2235 err = rtnl_fill_ifinfo(skb, dev, net, 2236 RTM_NEWLINK, 2237 NETLINK_CB(cb->skb).portid, 2238 nlh->nlmsg_seq, 0, flags, 2239 ext_filter_mask, 0, NULL, 0, 2240 netnsid, GFP_KERNEL); 2241 2242 if (err < 0) { 2243 if (likely(skb->len)) 2244 goto out; 2245 2246 goto out_err; 2247 } 2248 cont: 2249 idx++; 2250 } 2251 } 2252 out: 2253 err = skb->len; 2254 out_err: 2255 cb->args[1] = idx; 2256 cb->args[0] = h; 2257 cb->seq = tgt_net->dev_base_seq; 2258 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 2259 if (netnsid >= 0) 2260 put_net(tgt_net); 2261 2262 return err; 2263 } 2264 2265 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len, 2266 struct netlink_ext_ack *exterr) 2267 { 2268 return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy, 2269 exterr); 2270 } 2271 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 2272 2273 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 2274 { 2275 struct net *net; 2276 /* Examine the link attributes and figure out which 2277 * network namespace we are talking about. 2278 */ 2279 if (tb[IFLA_NET_NS_PID]) 2280 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 2281 else if (tb[IFLA_NET_NS_FD]) 2282 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 2283 else 2284 net = get_net(src_net); 2285 return net; 2286 } 2287 EXPORT_SYMBOL(rtnl_link_get_net); 2288 2289 /* Figure out which network namespace we are talking about by 2290 * examining the link attributes in the following order: 2291 * 2292 * 1. IFLA_NET_NS_PID 2293 * 2. IFLA_NET_NS_FD 2294 * 3. IFLA_TARGET_NETNSID 2295 */ 2296 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net, 2297 struct nlattr *tb[]) 2298 { 2299 struct net *net; 2300 2301 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) 2302 return rtnl_link_get_net(src_net, tb); 2303 2304 if (!tb[IFLA_TARGET_NETNSID]) 2305 return get_net(src_net); 2306 2307 net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID])); 2308 if (!net) 2309 return ERR_PTR(-EINVAL); 2310 2311 return net; 2312 } 2313 2314 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb, 2315 struct net *src_net, 2316 struct nlattr *tb[], int cap) 2317 { 2318 struct net *net; 2319 2320 net = rtnl_link_get_net_by_nlattr(src_net, tb); 2321 if (IS_ERR(net)) 2322 return net; 2323 2324 if (!netlink_ns_capable(skb, net->user_ns, cap)) { 2325 put_net(net); 2326 return ERR_PTR(-EPERM); 2327 } 2328 2329 return net; 2330 } 2331 2332 /* Verify that rtnetlink requests do not pass additional properties 2333 * potentially referring to different network namespaces. 2334 */ 2335 static int rtnl_ensure_unique_netns(struct nlattr *tb[], 2336 struct netlink_ext_ack *extack, 2337 bool netns_id_only) 2338 { 2339 2340 if (netns_id_only) { 2341 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD]) 2342 return 0; 2343 2344 NL_SET_ERR_MSG(extack, "specified netns attribute not supported"); 2345 return -EOPNOTSUPP; 2346 } 2347 2348 if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])) 2349 goto invalid_attr; 2350 2351 if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD])) 2352 goto invalid_attr; 2353 2354 if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID])) 2355 goto invalid_attr; 2356 2357 return 0; 2358 2359 invalid_attr: 2360 NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified"); 2361 return -EINVAL; 2362 } 2363 2364 static int rtnl_set_vf_rate(struct net_device *dev, int vf, int min_tx_rate, 2365 int max_tx_rate) 2366 { 2367 const struct net_device_ops *ops = dev->netdev_ops; 2368 2369 if (!ops->ndo_set_vf_rate) 2370 return -EOPNOTSUPP; 2371 if (max_tx_rate && max_tx_rate < min_tx_rate) 2372 return -EINVAL; 2373 2374 return ops->ndo_set_vf_rate(dev, vf, min_tx_rate, max_tx_rate); 2375 } 2376 2377 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[], 2378 struct netlink_ext_ack *extack) 2379 { 2380 if (dev) { 2381 if (tb[IFLA_ADDRESS] && 2382 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 2383 return -EINVAL; 2384 2385 if (tb[IFLA_BROADCAST] && 2386 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 2387 return -EINVAL; 2388 2389 if (tb[IFLA_GSO_MAX_SIZE] && 2390 nla_get_u32(tb[IFLA_GSO_MAX_SIZE]) > dev->tso_max_size) { 2391 NL_SET_ERR_MSG(extack, "too big gso_max_size"); 2392 return -EINVAL; 2393 } 2394 2395 if (tb[IFLA_GSO_MAX_SEGS] && 2396 (nla_get_u32(tb[IFLA_GSO_MAX_SEGS]) > GSO_MAX_SEGS || 2397 nla_get_u32(tb[IFLA_GSO_MAX_SEGS]) > dev->tso_max_segs)) { 2398 NL_SET_ERR_MSG(extack, "too big gso_max_segs"); 2399 return -EINVAL; 2400 } 2401 2402 if (tb[IFLA_GSO_IPV4_MAX_SIZE] && 2403 nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE]) > dev->tso_max_size) { 2404 NL_SET_ERR_MSG(extack, "too big gso_ipv4_max_size"); 2405 return -EINVAL; 2406 } 2407 } 2408 2409 if (tb[IFLA_AF_SPEC]) { 2410 struct nlattr *af; 2411 int rem, err; 2412 2413 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2414 const struct rtnl_af_ops *af_ops; 2415 2416 af_ops = rtnl_af_lookup(nla_type(af)); 2417 if (!af_ops) 2418 return -EAFNOSUPPORT; 2419 2420 if (!af_ops->set_link_af) 2421 return -EOPNOTSUPP; 2422 2423 if (af_ops->validate_link_af) { 2424 err = af_ops->validate_link_af(dev, af, extack); 2425 if (err < 0) 2426 return err; 2427 } 2428 } 2429 } 2430 2431 return 0; 2432 } 2433 2434 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt, 2435 int guid_type) 2436 { 2437 const struct net_device_ops *ops = dev->netdev_ops; 2438 2439 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type); 2440 } 2441 2442 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type) 2443 { 2444 if (dev->type != ARPHRD_INFINIBAND) 2445 return -EOPNOTSUPP; 2446 2447 return handle_infiniband_guid(dev, ivt, guid_type); 2448 } 2449 2450 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 2451 { 2452 const struct net_device_ops *ops = dev->netdev_ops; 2453 int err = -EINVAL; 2454 2455 if (tb[IFLA_VF_MAC]) { 2456 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 2457 2458 if (ivm->vf >= INT_MAX) 2459 return -EINVAL; 2460 err = -EOPNOTSUPP; 2461 if (ops->ndo_set_vf_mac) 2462 err = ops->ndo_set_vf_mac(dev, ivm->vf, 2463 ivm->mac); 2464 if (err < 0) 2465 return err; 2466 } 2467 2468 if (tb[IFLA_VF_VLAN]) { 2469 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 2470 2471 if (ivv->vf >= INT_MAX) 2472 return -EINVAL; 2473 err = -EOPNOTSUPP; 2474 if (ops->ndo_set_vf_vlan) 2475 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 2476 ivv->qos, 2477 htons(ETH_P_8021Q)); 2478 if (err < 0) 2479 return err; 2480 } 2481 2482 if (tb[IFLA_VF_VLAN_LIST]) { 2483 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN]; 2484 struct nlattr *attr; 2485 int rem, len = 0; 2486 2487 err = -EOPNOTSUPP; 2488 if (!ops->ndo_set_vf_vlan) 2489 return err; 2490 2491 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) { 2492 if (nla_type(attr) != IFLA_VF_VLAN_INFO || 2493 nla_len(attr) < NLA_HDRLEN) { 2494 return -EINVAL; 2495 } 2496 if (len >= MAX_VLAN_LIST_LEN) 2497 return -EOPNOTSUPP; 2498 ivvl[len] = nla_data(attr); 2499 2500 len++; 2501 } 2502 if (len == 0) 2503 return -EINVAL; 2504 2505 if (ivvl[0]->vf >= INT_MAX) 2506 return -EINVAL; 2507 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan, 2508 ivvl[0]->qos, ivvl[0]->vlan_proto); 2509 if (err < 0) 2510 return err; 2511 } 2512 2513 if (tb[IFLA_VF_TX_RATE]) { 2514 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 2515 struct ifla_vf_info ivf; 2516 2517 if (ivt->vf >= INT_MAX) 2518 return -EINVAL; 2519 err = -EOPNOTSUPP; 2520 if (ops->ndo_get_vf_config) 2521 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 2522 if (err < 0) 2523 return err; 2524 2525 err = rtnl_set_vf_rate(dev, ivt->vf, 2526 ivf.min_tx_rate, ivt->rate); 2527 if (err < 0) 2528 return err; 2529 } 2530 2531 if (tb[IFLA_VF_RATE]) { 2532 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 2533 2534 if (ivt->vf >= INT_MAX) 2535 return -EINVAL; 2536 2537 err = rtnl_set_vf_rate(dev, ivt->vf, 2538 ivt->min_tx_rate, ivt->max_tx_rate); 2539 if (err < 0) 2540 return err; 2541 } 2542 2543 if (tb[IFLA_VF_SPOOFCHK]) { 2544 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 2545 2546 if (ivs->vf >= INT_MAX) 2547 return -EINVAL; 2548 err = -EOPNOTSUPP; 2549 if (ops->ndo_set_vf_spoofchk) 2550 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 2551 ivs->setting); 2552 if (err < 0) 2553 return err; 2554 } 2555 2556 if (tb[IFLA_VF_LINK_STATE]) { 2557 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 2558 2559 if (ivl->vf >= INT_MAX) 2560 return -EINVAL; 2561 err = -EOPNOTSUPP; 2562 if (ops->ndo_set_vf_link_state) 2563 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 2564 ivl->link_state); 2565 if (err < 0) 2566 return err; 2567 } 2568 2569 if (tb[IFLA_VF_RSS_QUERY_EN]) { 2570 struct ifla_vf_rss_query_en *ivrssq_en; 2571 2572 err = -EOPNOTSUPP; 2573 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 2574 if (ivrssq_en->vf >= INT_MAX) 2575 return -EINVAL; 2576 if (ops->ndo_set_vf_rss_query_en) 2577 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 2578 ivrssq_en->setting); 2579 if (err < 0) 2580 return err; 2581 } 2582 2583 if (tb[IFLA_VF_TRUST]) { 2584 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 2585 2586 if (ivt->vf >= INT_MAX) 2587 return -EINVAL; 2588 err = -EOPNOTSUPP; 2589 if (ops->ndo_set_vf_trust) 2590 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 2591 if (err < 0) 2592 return err; 2593 } 2594 2595 if (tb[IFLA_VF_IB_NODE_GUID]) { 2596 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]); 2597 2598 if (ivt->vf >= INT_MAX) 2599 return -EINVAL; 2600 if (!ops->ndo_set_vf_guid) 2601 return -EOPNOTSUPP; 2602 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID); 2603 } 2604 2605 if (tb[IFLA_VF_IB_PORT_GUID]) { 2606 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]); 2607 2608 if (ivt->vf >= INT_MAX) 2609 return -EINVAL; 2610 if (!ops->ndo_set_vf_guid) 2611 return -EOPNOTSUPP; 2612 2613 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID); 2614 } 2615 2616 return err; 2617 } 2618 2619 static int do_set_master(struct net_device *dev, int ifindex, 2620 struct netlink_ext_ack *extack) 2621 { 2622 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 2623 const struct net_device_ops *ops; 2624 int err; 2625 2626 if (upper_dev) { 2627 if (upper_dev->ifindex == ifindex) 2628 return 0; 2629 ops = upper_dev->netdev_ops; 2630 if (ops->ndo_del_slave) { 2631 err = ops->ndo_del_slave(upper_dev, dev); 2632 if (err) 2633 return err; 2634 } else { 2635 return -EOPNOTSUPP; 2636 } 2637 } 2638 2639 if (ifindex) { 2640 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 2641 if (!upper_dev) 2642 return -EINVAL; 2643 ops = upper_dev->netdev_ops; 2644 if (ops->ndo_add_slave) { 2645 err = ops->ndo_add_slave(upper_dev, dev, extack); 2646 if (err) 2647 return err; 2648 } else { 2649 return -EOPNOTSUPP; 2650 } 2651 } 2652 return 0; 2653 } 2654 2655 static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = { 2656 [IFLA_PROTO_DOWN_REASON_MASK] = { .type = NLA_U32 }, 2657 [IFLA_PROTO_DOWN_REASON_VALUE] = { .type = NLA_U32 }, 2658 }; 2659 2660 static int do_set_proto_down(struct net_device *dev, 2661 struct nlattr *nl_proto_down, 2662 struct nlattr *nl_proto_down_reason, 2663 struct netlink_ext_ack *extack) 2664 { 2665 struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1]; 2666 unsigned long mask = 0; 2667 u32 value; 2668 bool proto_down; 2669 int err; 2670 2671 if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN)) { 2672 NL_SET_ERR_MSG(extack, "Protodown not supported by device"); 2673 return -EOPNOTSUPP; 2674 } 2675 2676 if (nl_proto_down_reason) { 2677 err = nla_parse_nested_deprecated(pdreason, 2678 IFLA_PROTO_DOWN_REASON_MAX, 2679 nl_proto_down_reason, 2680 ifla_proto_down_reason_policy, 2681 NULL); 2682 if (err < 0) 2683 return err; 2684 2685 if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) { 2686 NL_SET_ERR_MSG(extack, "Invalid protodown reason value"); 2687 return -EINVAL; 2688 } 2689 2690 value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]); 2691 2692 if (pdreason[IFLA_PROTO_DOWN_REASON_MASK]) 2693 mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]); 2694 2695 dev_change_proto_down_reason(dev, mask, value); 2696 } 2697 2698 if (nl_proto_down) { 2699 proto_down = nla_get_u8(nl_proto_down); 2700 2701 /* Don't turn off protodown if there are active reasons */ 2702 if (!proto_down && dev->proto_down_reason) { 2703 NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons"); 2704 return -EBUSY; 2705 } 2706 err = dev_change_proto_down(dev, 2707 proto_down); 2708 if (err) 2709 return err; 2710 } 2711 2712 return 0; 2713 } 2714 2715 #define DO_SETLINK_MODIFIED 0x01 2716 /* notify flag means notify + modified. */ 2717 #define DO_SETLINK_NOTIFY 0x03 2718 static int do_setlink(const struct sk_buff *skb, 2719 struct net_device *dev, struct ifinfomsg *ifm, 2720 struct netlink_ext_ack *extack, 2721 struct nlattr **tb, int status) 2722 { 2723 const struct net_device_ops *ops = dev->netdev_ops; 2724 char ifname[IFNAMSIZ]; 2725 int err; 2726 2727 err = validate_linkmsg(dev, tb, extack); 2728 if (err < 0) 2729 return err; 2730 2731 if (tb[IFLA_IFNAME]) 2732 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2733 else 2734 ifname[0] = '\0'; 2735 2736 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) { 2737 const char *pat = ifname[0] ? ifname : NULL; 2738 struct net *net; 2739 int new_ifindex; 2740 2741 net = rtnl_link_get_net_capable(skb, dev_net(dev), 2742 tb, CAP_NET_ADMIN); 2743 if (IS_ERR(net)) { 2744 err = PTR_ERR(net); 2745 goto errout; 2746 } 2747 2748 if (tb[IFLA_NEW_IFINDEX]) 2749 new_ifindex = nla_get_s32(tb[IFLA_NEW_IFINDEX]); 2750 else 2751 new_ifindex = 0; 2752 2753 err = __dev_change_net_namespace(dev, net, pat, new_ifindex); 2754 put_net(net); 2755 if (err) 2756 goto errout; 2757 status |= DO_SETLINK_MODIFIED; 2758 } 2759 2760 if (tb[IFLA_MAP]) { 2761 struct rtnl_link_ifmap *u_map; 2762 struct ifmap k_map; 2763 2764 if (!ops->ndo_set_config) { 2765 err = -EOPNOTSUPP; 2766 goto errout; 2767 } 2768 2769 if (!netif_device_present(dev)) { 2770 err = -ENODEV; 2771 goto errout; 2772 } 2773 2774 u_map = nla_data(tb[IFLA_MAP]); 2775 k_map.mem_start = (unsigned long) u_map->mem_start; 2776 k_map.mem_end = (unsigned long) u_map->mem_end; 2777 k_map.base_addr = (unsigned short) u_map->base_addr; 2778 k_map.irq = (unsigned char) u_map->irq; 2779 k_map.dma = (unsigned char) u_map->dma; 2780 k_map.port = (unsigned char) u_map->port; 2781 2782 err = ops->ndo_set_config(dev, &k_map); 2783 if (err < 0) 2784 goto errout; 2785 2786 status |= DO_SETLINK_NOTIFY; 2787 } 2788 2789 if (tb[IFLA_ADDRESS]) { 2790 struct sockaddr *sa; 2791 int len; 2792 2793 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len, 2794 sizeof(*sa)); 2795 sa = kmalloc(len, GFP_KERNEL); 2796 if (!sa) { 2797 err = -ENOMEM; 2798 goto errout; 2799 } 2800 sa->sa_family = dev->type; 2801 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 2802 dev->addr_len); 2803 err = dev_set_mac_address_user(dev, sa, extack); 2804 kfree(sa); 2805 if (err) 2806 goto errout; 2807 status |= DO_SETLINK_MODIFIED; 2808 } 2809 2810 if (tb[IFLA_MTU]) { 2811 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack); 2812 if (err < 0) 2813 goto errout; 2814 status |= DO_SETLINK_MODIFIED; 2815 } 2816 2817 if (tb[IFLA_GROUP]) { 2818 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2819 status |= DO_SETLINK_NOTIFY; 2820 } 2821 2822 /* 2823 * Interface selected by interface index but interface 2824 * name provided implies that a name change has been 2825 * requested. 2826 */ 2827 if (ifm->ifi_index > 0 && ifname[0]) { 2828 err = dev_change_name(dev, ifname); 2829 if (err < 0) 2830 goto errout; 2831 status |= DO_SETLINK_MODIFIED; 2832 } 2833 2834 if (tb[IFLA_IFALIAS]) { 2835 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 2836 nla_len(tb[IFLA_IFALIAS])); 2837 if (err < 0) 2838 goto errout; 2839 status |= DO_SETLINK_NOTIFY; 2840 } 2841 2842 if (tb[IFLA_BROADCAST]) { 2843 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 2844 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 2845 } 2846 2847 if (tb[IFLA_MASTER]) { 2848 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); 2849 if (err) 2850 goto errout; 2851 status |= DO_SETLINK_MODIFIED; 2852 } 2853 2854 if (ifm->ifi_flags || ifm->ifi_change) { 2855 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm), 2856 extack); 2857 if (err < 0) 2858 goto errout; 2859 } 2860 2861 if (tb[IFLA_CARRIER]) { 2862 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 2863 if (err) 2864 goto errout; 2865 status |= DO_SETLINK_MODIFIED; 2866 } 2867 2868 if (tb[IFLA_TXQLEN]) { 2869 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]); 2870 2871 err = dev_change_tx_queue_len(dev, value); 2872 if (err) 2873 goto errout; 2874 status |= DO_SETLINK_MODIFIED; 2875 } 2876 2877 if (tb[IFLA_GSO_MAX_SIZE]) { 2878 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]); 2879 2880 if (dev->gso_max_size ^ max_size) { 2881 netif_set_gso_max_size(dev, max_size); 2882 status |= DO_SETLINK_MODIFIED; 2883 } 2884 } 2885 2886 if (tb[IFLA_GSO_MAX_SEGS]) { 2887 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]); 2888 2889 if (dev->gso_max_segs ^ max_segs) { 2890 netif_set_gso_max_segs(dev, max_segs); 2891 status |= DO_SETLINK_MODIFIED; 2892 } 2893 } 2894 2895 if (tb[IFLA_GRO_MAX_SIZE]) { 2896 u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_MAX_SIZE]); 2897 2898 if (dev->gro_max_size ^ gro_max_size) { 2899 netif_set_gro_max_size(dev, gro_max_size); 2900 status |= DO_SETLINK_MODIFIED; 2901 } 2902 } 2903 2904 if (tb[IFLA_GSO_IPV4_MAX_SIZE]) { 2905 u32 max_size = nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE]); 2906 2907 if (dev->gso_ipv4_max_size ^ max_size) { 2908 netif_set_gso_ipv4_max_size(dev, max_size); 2909 status |= DO_SETLINK_MODIFIED; 2910 } 2911 } 2912 2913 if (tb[IFLA_GRO_IPV4_MAX_SIZE]) { 2914 u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE]); 2915 2916 if (dev->gro_ipv4_max_size ^ gro_max_size) { 2917 netif_set_gro_ipv4_max_size(dev, gro_max_size); 2918 status |= DO_SETLINK_MODIFIED; 2919 } 2920 } 2921 2922 if (tb[IFLA_OPERSTATE]) 2923 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2924 2925 if (tb[IFLA_LINKMODE]) { 2926 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 2927 2928 write_lock(&dev_base_lock); 2929 if (dev->link_mode ^ value) 2930 status |= DO_SETLINK_NOTIFY; 2931 dev->link_mode = value; 2932 write_unlock(&dev_base_lock); 2933 } 2934 2935 if (tb[IFLA_VFINFO_LIST]) { 2936 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 2937 struct nlattr *attr; 2938 int rem; 2939 2940 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 2941 if (nla_type(attr) != IFLA_VF_INFO || 2942 nla_len(attr) < NLA_HDRLEN) { 2943 err = -EINVAL; 2944 goto errout; 2945 } 2946 err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX, 2947 attr, 2948 ifla_vf_policy, 2949 NULL); 2950 if (err < 0) 2951 goto errout; 2952 err = do_setvfinfo(dev, vfinfo); 2953 if (err < 0) 2954 goto errout; 2955 status |= DO_SETLINK_NOTIFY; 2956 } 2957 } 2958 err = 0; 2959 2960 if (tb[IFLA_VF_PORTS]) { 2961 struct nlattr *port[IFLA_PORT_MAX+1]; 2962 struct nlattr *attr; 2963 int vf; 2964 int rem; 2965 2966 err = -EOPNOTSUPP; 2967 if (!ops->ndo_set_vf_port) 2968 goto errout; 2969 2970 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 2971 if (nla_type(attr) != IFLA_VF_PORT || 2972 nla_len(attr) < NLA_HDRLEN) { 2973 err = -EINVAL; 2974 goto errout; 2975 } 2976 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX, 2977 attr, 2978 ifla_port_policy, 2979 NULL); 2980 if (err < 0) 2981 goto errout; 2982 if (!port[IFLA_PORT_VF]) { 2983 err = -EOPNOTSUPP; 2984 goto errout; 2985 } 2986 vf = nla_get_u32(port[IFLA_PORT_VF]); 2987 err = ops->ndo_set_vf_port(dev, vf, port); 2988 if (err < 0) 2989 goto errout; 2990 status |= DO_SETLINK_NOTIFY; 2991 } 2992 } 2993 err = 0; 2994 2995 if (tb[IFLA_PORT_SELF]) { 2996 struct nlattr *port[IFLA_PORT_MAX+1]; 2997 2998 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX, 2999 tb[IFLA_PORT_SELF], 3000 ifla_port_policy, NULL); 3001 if (err < 0) 3002 goto errout; 3003 3004 err = -EOPNOTSUPP; 3005 if (ops->ndo_set_vf_port) 3006 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 3007 if (err < 0) 3008 goto errout; 3009 status |= DO_SETLINK_NOTIFY; 3010 } 3011 3012 if (tb[IFLA_AF_SPEC]) { 3013 struct nlattr *af; 3014 int rem; 3015 3016 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 3017 const struct rtnl_af_ops *af_ops; 3018 3019 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af)))); 3020 3021 err = af_ops->set_link_af(dev, af, extack); 3022 if (err < 0) 3023 goto errout; 3024 3025 status |= DO_SETLINK_NOTIFY; 3026 } 3027 } 3028 err = 0; 3029 3030 if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) { 3031 err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN], 3032 tb[IFLA_PROTO_DOWN_REASON], extack); 3033 if (err) 3034 goto errout; 3035 status |= DO_SETLINK_NOTIFY; 3036 } 3037 3038 if (tb[IFLA_XDP]) { 3039 struct nlattr *xdp[IFLA_XDP_MAX + 1]; 3040 u32 xdp_flags = 0; 3041 3042 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX, 3043 tb[IFLA_XDP], 3044 ifla_xdp_policy, NULL); 3045 if (err < 0) 3046 goto errout; 3047 3048 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) { 3049 err = -EINVAL; 3050 goto errout; 3051 } 3052 3053 if (xdp[IFLA_XDP_FLAGS]) { 3054 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]); 3055 if (xdp_flags & ~XDP_FLAGS_MASK) { 3056 err = -EINVAL; 3057 goto errout; 3058 } 3059 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) { 3060 err = -EINVAL; 3061 goto errout; 3062 } 3063 } 3064 3065 if (xdp[IFLA_XDP_FD]) { 3066 int expected_fd = -1; 3067 3068 if (xdp_flags & XDP_FLAGS_REPLACE) { 3069 if (!xdp[IFLA_XDP_EXPECTED_FD]) { 3070 err = -EINVAL; 3071 goto errout; 3072 } 3073 expected_fd = 3074 nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]); 3075 } 3076 3077 err = dev_change_xdp_fd(dev, extack, 3078 nla_get_s32(xdp[IFLA_XDP_FD]), 3079 expected_fd, 3080 xdp_flags); 3081 if (err) 3082 goto errout; 3083 status |= DO_SETLINK_NOTIFY; 3084 } 3085 } 3086 3087 errout: 3088 if (status & DO_SETLINK_MODIFIED) { 3089 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY) 3090 netdev_state_change(dev); 3091 3092 if (err < 0) 3093 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", 3094 dev->name); 3095 } 3096 3097 return err; 3098 } 3099 3100 static struct net_device *rtnl_dev_get(struct net *net, 3101 struct nlattr *tb[]) 3102 { 3103 char ifname[ALTIFNAMSIZ]; 3104 3105 if (tb[IFLA_IFNAME]) 3106 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 3107 else if (tb[IFLA_ALT_IFNAME]) 3108 nla_strscpy(ifname, tb[IFLA_ALT_IFNAME], ALTIFNAMSIZ); 3109 else 3110 return NULL; 3111 3112 return __dev_get_by_name(net, ifname); 3113 } 3114 3115 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3116 struct netlink_ext_ack *extack) 3117 { 3118 struct net *net = sock_net(skb->sk); 3119 struct ifinfomsg *ifm; 3120 struct net_device *dev; 3121 int err; 3122 struct nlattr *tb[IFLA_MAX+1]; 3123 3124 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3125 ifla_policy, extack); 3126 if (err < 0) 3127 goto errout; 3128 3129 err = rtnl_ensure_unique_netns(tb, extack, false); 3130 if (err < 0) 3131 goto errout; 3132 3133 err = -EINVAL; 3134 ifm = nlmsg_data(nlh); 3135 if (ifm->ifi_index > 0) 3136 dev = __dev_get_by_index(net, ifm->ifi_index); 3137 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3138 dev = rtnl_dev_get(net, tb); 3139 else 3140 goto errout; 3141 3142 if (dev == NULL) { 3143 err = -ENODEV; 3144 goto errout; 3145 } 3146 3147 err = do_setlink(skb, dev, ifm, extack, tb, 0); 3148 errout: 3149 return err; 3150 } 3151 3152 static int rtnl_group_dellink(const struct net *net, int group) 3153 { 3154 struct net_device *dev, *aux; 3155 LIST_HEAD(list_kill); 3156 bool found = false; 3157 3158 if (!group) 3159 return -EPERM; 3160 3161 for_each_netdev(net, dev) { 3162 if (dev->group == group) { 3163 const struct rtnl_link_ops *ops; 3164 3165 found = true; 3166 ops = dev->rtnl_link_ops; 3167 if (!ops || !ops->dellink) 3168 return -EOPNOTSUPP; 3169 } 3170 } 3171 3172 if (!found) 3173 return -ENODEV; 3174 3175 for_each_netdev_safe(net, dev, aux) { 3176 if (dev->group == group) { 3177 const struct rtnl_link_ops *ops; 3178 3179 ops = dev->rtnl_link_ops; 3180 ops->dellink(dev, &list_kill); 3181 } 3182 } 3183 unregister_netdevice_many(&list_kill); 3184 3185 return 0; 3186 } 3187 3188 int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh) 3189 { 3190 const struct rtnl_link_ops *ops; 3191 LIST_HEAD(list_kill); 3192 3193 ops = dev->rtnl_link_ops; 3194 if (!ops || !ops->dellink) 3195 return -EOPNOTSUPP; 3196 3197 ops->dellink(dev, &list_kill); 3198 unregister_netdevice_many_notify(&list_kill, portid, nlh); 3199 3200 return 0; 3201 } 3202 EXPORT_SYMBOL_GPL(rtnl_delete_link); 3203 3204 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 3205 struct netlink_ext_ack *extack) 3206 { 3207 struct net *net = sock_net(skb->sk); 3208 u32 portid = NETLINK_CB(skb).portid; 3209 struct net *tgt_net = net; 3210 struct net_device *dev = NULL; 3211 struct ifinfomsg *ifm; 3212 struct nlattr *tb[IFLA_MAX+1]; 3213 int err; 3214 int netnsid = -1; 3215 3216 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3217 ifla_policy, extack); 3218 if (err < 0) 3219 return err; 3220 3221 err = rtnl_ensure_unique_netns(tb, extack, true); 3222 if (err < 0) 3223 return err; 3224 3225 if (tb[IFLA_TARGET_NETNSID]) { 3226 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 3227 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid); 3228 if (IS_ERR(tgt_net)) 3229 return PTR_ERR(tgt_net); 3230 } 3231 3232 err = -EINVAL; 3233 ifm = nlmsg_data(nlh); 3234 if (ifm->ifi_index > 0) 3235 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 3236 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3237 dev = rtnl_dev_get(net, tb); 3238 else if (tb[IFLA_GROUP]) 3239 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP])); 3240 else 3241 goto out; 3242 3243 if (!dev) { 3244 if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME] || ifm->ifi_index > 0) 3245 err = -ENODEV; 3246 3247 goto out; 3248 } 3249 3250 err = rtnl_delete_link(dev, portid, nlh); 3251 3252 out: 3253 if (netnsid >= 0) 3254 put_net(tgt_net); 3255 3256 return err; 3257 } 3258 3259 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm, 3260 u32 portid, const struct nlmsghdr *nlh) 3261 { 3262 unsigned int old_flags; 3263 int err; 3264 3265 old_flags = dev->flags; 3266 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 3267 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm), 3268 NULL); 3269 if (err < 0) 3270 return err; 3271 } 3272 3273 if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) { 3274 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags), portid, nlh); 3275 } else { 3276 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 3277 __dev_notify_flags(dev, old_flags, ~0U, portid, nlh); 3278 } 3279 return 0; 3280 } 3281 EXPORT_SYMBOL(rtnl_configure_link); 3282 3283 struct net_device *rtnl_create_link(struct net *net, const char *ifname, 3284 unsigned char name_assign_type, 3285 const struct rtnl_link_ops *ops, 3286 struct nlattr *tb[], 3287 struct netlink_ext_ack *extack) 3288 { 3289 struct net_device *dev; 3290 unsigned int num_tx_queues = 1; 3291 unsigned int num_rx_queues = 1; 3292 int err; 3293 3294 if (tb[IFLA_NUM_TX_QUEUES]) 3295 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 3296 else if (ops->get_num_tx_queues) 3297 num_tx_queues = ops->get_num_tx_queues(); 3298 3299 if (tb[IFLA_NUM_RX_QUEUES]) 3300 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 3301 else if (ops->get_num_rx_queues) 3302 num_rx_queues = ops->get_num_rx_queues(); 3303 3304 if (num_tx_queues < 1 || num_tx_queues > 4096) { 3305 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues"); 3306 return ERR_PTR(-EINVAL); 3307 } 3308 3309 if (num_rx_queues < 1 || num_rx_queues > 4096) { 3310 NL_SET_ERR_MSG(extack, "Invalid number of receive queues"); 3311 return ERR_PTR(-EINVAL); 3312 } 3313 3314 if (ops->alloc) { 3315 dev = ops->alloc(tb, ifname, name_assign_type, 3316 num_tx_queues, num_rx_queues); 3317 if (IS_ERR(dev)) 3318 return dev; 3319 } else { 3320 dev = alloc_netdev_mqs(ops->priv_size, ifname, 3321 name_assign_type, ops->setup, 3322 num_tx_queues, num_rx_queues); 3323 } 3324 3325 if (!dev) 3326 return ERR_PTR(-ENOMEM); 3327 3328 err = validate_linkmsg(dev, tb, extack); 3329 if (err < 0) { 3330 free_netdev(dev); 3331 return ERR_PTR(err); 3332 } 3333 3334 dev_net_set(dev, net); 3335 dev->rtnl_link_ops = ops; 3336 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 3337 3338 if (tb[IFLA_MTU]) { 3339 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3340 3341 err = dev_validate_mtu(dev, mtu, extack); 3342 if (err) { 3343 free_netdev(dev); 3344 return ERR_PTR(err); 3345 } 3346 dev->mtu = mtu; 3347 } 3348 if (tb[IFLA_ADDRESS]) { 3349 __dev_addr_set(dev, nla_data(tb[IFLA_ADDRESS]), 3350 nla_len(tb[IFLA_ADDRESS])); 3351 dev->addr_assign_type = NET_ADDR_SET; 3352 } 3353 if (tb[IFLA_BROADCAST]) 3354 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 3355 nla_len(tb[IFLA_BROADCAST])); 3356 if (tb[IFLA_TXQLEN]) 3357 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 3358 if (tb[IFLA_OPERSTATE]) 3359 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 3360 if (tb[IFLA_LINKMODE]) 3361 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 3362 if (tb[IFLA_GROUP]) 3363 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 3364 if (tb[IFLA_GSO_MAX_SIZE]) 3365 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE])); 3366 if (tb[IFLA_GSO_MAX_SEGS]) 3367 netif_set_gso_max_segs(dev, nla_get_u32(tb[IFLA_GSO_MAX_SEGS])); 3368 if (tb[IFLA_GRO_MAX_SIZE]) 3369 netif_set_gro_max_size(dev, nla_get_u32(tb[IFLA_GRO_MAX_SIZE])); 3370 if (tb[IFLA_GSO_IPV4_MAX_SIZE]) 3371 netif_set_gso_ipv4_max_size(dev, nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE])); 3372 if (tb[IFLA_GRO_IPV4_MAX_SIZE]) 3373 netif_set_gro_ipv4_max_size(dev, nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE])); 3374 3375 return dev; 3376 } 3377 EXPORT_SYMBOL(rtnl_create_link); 3378 3379 static int rtnl_group_changelink(const struct sk_buff *skb, 3380 struct net *net, int group, 3381 struct ifinfomsg *ifm, 3382 struct netlink_ext_ack *extack, 3383 struct nlattr **tb) 3384 { 3385 struct net_device *dev, *aux; 3386 int err; 3387 3388 for_each_netdev_safe(net, dev, aux) { 3389 if (dev->group == group) { 3390 err = do_setlink(skb, dev, ifm, extack, tb, 0); 3391 if (err < 0) 3392 return err; 3393 } 3394 } 3395 3396 return 0; 3397 } 3398 3399 static int rtnl_newlink_create(struct sk_buff *skb, struct ifinfomsg *ifm, 3400 const struct rtnl_link_ops *ops, 3401 const struct nlmsghdr *nlh, 3402 struct nlattr **tb, struct nlattr **data, 3403 struct netlink_ext_ack *extack) 3404 { 3405 unsigned char name_assign_type = NET_NAME_USER; 3406 struct net *net = sock_net(skb->sk); 3407 u32 portid = NETLINK_CB(skb).portid; 3408 struct net *dest_net, *link_net; 3409 struct net_device *dev; 3410 char ifname[IFNAMSIZ]; 3411 int err; 3412 3413 if (!ops->alloc && !ops->setup) 3414 return -EOPNOTSUPP; 3415 3416 if (tb[IFLA_IFNAME]) { 3417 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 3418 } else { 3419 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 3420 name_assign_type = NET_NAME_ENUM; 3421 } 3422 3423 dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN); 3424 if (IS_ERR(dest_net)) 3425 return PTR_ERR(dest_net); 3426 3427 if (tb[IFLA_LINK_NETNSID]) { 3428 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 3429 3430 link_net = get_net_ns_by_id(dest_net, id); 3431 if (!link_net) { 3432 NL_SET_ERR_MSG(extack, "Unknown network namespace id"); 3433 err = -EINVAL; 3434 goto out; 3435 } 3436 err = -EPERM; 3437 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 3438 goto out; 3439 } else { 3440 link_net = NULL; 3441 } 3442 3443 dev = rtnl_create_link(link_net ? : dest_net, ifname, 3444 name_assign_type, ops, tb, extack); 3445 if (IS_ERR(dev)) { 3446 err = PTR_ERR(dev); 3447 goto out; 3448 } 3449 3450 dev->ifindex = ifm->ifi_index; 3451 3452 if (ops->newlink) 3453 err = ops->newlink(link_net ? : net, dev, tb, data, extack); 3454 else 3455 err = register_netdevice(dev); 3456 if (err < 0) { 3457 free_netdev(dev); 3458 goto out; 3459 } 3460 3461 err = rtnl_configure_link(dev, ifm, portid, nlh); 3462 if (err < 0) 3463 goto out_unregister; 3464 if (link_net) { 3465 err = dev_change_net_namespace(dev, dest_net, ifname); 3466 if (err < 0) 3467 goto out_unregister; 3468 } 3469 if (tb[IFLA_MASTER]) { 3470 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); 3471 if (err) 3472 goto out_unregister; 3473 } 3474 out: 3475 if (link_net) 3476 put_net(link_net); 3477 put_net(dest_net); 3478 return err; 3479 out_unregister: 3480 if (ops->newlink) { 3481 LIST_HEAD(list_kill); 3482 3483 ops->dellink(dev, &list_kill); 3484 unregister_netdevice_many(&list_kill); 3485 } else { 3486 unregister_netdevice(dev); 3487 } 3488 goto out; 3489 } 3490 3491 struct rtnl_newlink_tbs { 3492 struct nlattr *tb[IFLA_MAX + 1]; 3493 struct nlattr *attr[RTNL_MAX_TYPE + 1]; 3494 struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1]; 3495 }; 3496 3497 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3498 struct rtnl_newlink_tbs *tbs, 3499 struct netlink_ext_ack *extack) 3500 { 3501 struct nlattr *linkinfo[IFLA_INFO_MAX + 1]; 3502 struct nlattr ** const tb = tbs->tb; 3503 const struct rtnl_link_ops *m_ops; 3504 struct net_device *master_dev; 3505 struct net *net = sock_net(skb->sk); 3506 const struct rtnl_link_ops *ops; 3507 struct nlattr **slave_data; 3508 char kind[MODULE_NAME_LEN]; 3509 struct net_device *dev; 3510 struct ifinfomsg *ifm; 3511 struct nlattr **data; 3512 bool link_specified; 3513 int err; 3514 3515 #ifdef CONFIG_MODULES 3516 replay: 3517 #endif 3518 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3519 ifla_policy, extack); 3520 if (err < 0) 3521 return err; 3522 3523 err = rtnl_ensure_unique_netns(tb, extack, false); 3524 if (err < 0) 3525 return err; 3526 3527 ifm = nlmsg_data(nlh); 3528 if (ifm->ifi_index > 0) { 3529 link_specified = true; 3530 dev = __dev_get_by_index(net, ifm->ifi_index); 3531 } else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) { 3532 link_specified = true; 3533 dev = rtnl_dev_get(net, tb); 3534 } else { 3535 link_specified = false; 3536 dev = NULL; 3537 } 3538 3539 master_dev = NULL; 3540 m_ops = NULL; 3541 if (dev) { 3542 master_dev = netdev_master_upper_dev_get(dev); 3543 if (master_dev) 3544 m_ops = master_dev->rtnl_link_ops; 3545 } 3546 3547 err = validate_linkmsg(dev, tb, extack); 3548 if (err < 0) 3549 return err; 3550 3551 if (tb[IFLA_LINKINFO]) { 3552 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX, 3553 tb[IFLA_LINKINFO], 3554 ifla_info_policy, NULL); 3555 if (err < 0) 3556 return err; 3557 } else 3558 memset(linkinfo, 0, sizeof(linkinfo)); 3559 3560 if (linkinfo[IFLA_INFO_KIND]) { 3561 nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 3562 ops = rtnl_link_ops_get(kind); 3563 } else { 3564 kind[0] = '\0'; 3565 ops = NULL; 3566 } 3567 3568 data = NULL; 3569 if (ops) { 3570 if (ops->maxtype > RTNL_MAX_TYPE) 3571 return -EINVAL; 3572 3573 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 3574 err = nla_parse_nested_deprecated(tbs->attr, ops->maxtype, 3575 linkinfo[IFLA_INFO_DATA], 3576 ops->policy, extack); 3577 if (err < 0) 3578 return err; 3579 data = tbs->attr; 3580 } 3581 if (ops->validate) { 3582 err = ops->validate(tb, data, extack); 3583 if (err < 0) 3584 return err; 3585 } 3586 } 3587 3588 slave_data = NULL; 3589 if (m_ops) { 3590 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE) 3591 return -EINVAL; 3592 3593 if (m_ops->slave_maxtype && 3594 linkinfo[IFLA_INFO_SLAVE_DATA]) { 3595 err = nla_parse_nested_deprecated(tbs->slave_attr, 3596 m_ops->slave_maxtype, 3597 linkinfo[IFLA_INFO_SLAVE_DATA], 3598 m_ops->slave_policy, 3599 extack); 3600 if (err < 0) 3601 return err; 3602 slave_data = tbs->slave_attr; 3603 } 3604 } 3605 3606 if (dev) { 3607 int status = 0; 3608 3609 if (nlh->nlmsg_flags & NLM_F_EXCL) 3610 return -EEXIST; 3611 if (nlh->nlmsg_flags & NLM_F_REPLACE) 3612 return -EOPNOTSUPP; 3613 3614 if (linkinfo[IFLA_INFO_DATA]) { 3615 if (!ops || ops != dev->rtnl_link_ops || 3616 !ops->changelink) 3617 return -EOPNOTSUPP; 3618 3619 err = ops->changelink(dev, tb, data, extack); 3620 if (err < 0) 3621 return err; 3622 status |= DO_SETLINK_NOTIFY; 3623 } 3624 3625 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 3626 if (!m_ops || !m_ops->slave_changelink) 3627 return -EOPNOTSUPP; 3628 3629 err = m_ops->slave_changelink(master_dev, dev, tb, 3630 slave_data, extack); 3631 if (err < 0) 3632 return err; 3633 status |= DO_SETLINK_NOTIFY; 3634 } 3635 3636 return do_setlink(skb, dev, ifm, extack, tb, status); 3637 } 3638 3639 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 3640 /* No dev found and NLM_F_CREATE not set. Requested dev does not exist, 3641 * or it's for a group 3642 */ 3643 if (link_specified) 3644 return -ENODEV; 3645 if (tb[IFLA_GROUP]) 3646 return rtnl_group_changelink(skb, net, 3647 nla_get_u32(tb[IFLA_GROUP]), 3648 ifm, extack, tb); 3649 return -ENODEV; 3650 } 3651 3652 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO]) 3653 return -EOPNOTSUPP; 3654 3655 if (!ops) { 3656 #ifdef CONFIG_MODULES 3657 if (kind[0]) { 3658 __rtnl_unlock(); 3659 request_module("rtnl-link-%s", kind); 3660 rtnl_lock(); 3661 ops = rtnl_link_ops_get(kind); 3662 if (ops) 3663 goto replay; 3664 } 3665 #endif 3666 NL_SET_ERR_MSG(extack, "Unknown device type"); 3667 return -EOPNOTSUPP; 3668 } 3669 3670 return rtnl_newlink_create(skb, ifm, ops, nlh, tb, data, extack); 3671 } 3672 3673 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3674 struct netlink_ext_ack *extack) 3675 { 3676 struct rtnl_newlink_tbs *tbs; 3677 int ret; 3678 3679 tbs = kmalloc(sizeof(*tbs), GFP_KERNEL); 3680 if (!tbs) 3681 return -ENOMEM; 3682 3683 ret = __rtnl_newlink(skb, nlh, tbs, extack); 3684 kfree(tbs); 3685 return ret; 3686 } 3687 3688 static int rtnl_valid_getlink_req(struct sk_buff *skb, 3689 const struct nlmsghdr *nlh, 3690 struct nlattr **tb, 3691 struct netlink_ext_ack *extack) 3692 { 3693 struct ifinfomsg *ifm; 3694 int i, err; 3695 3696 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 3697 NL_SET_ERR_MSG(extack, "Invalid header for get link"); 3698 return -EINVAL; 3699 } 3700 3701 if (!netlink_strict_get_check(skb)) 3702 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3703 ifla_policy, extack); 3704 3705 ifm = nlmsg_data(nlh); 3706 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 3707 ifm->ifi_change) { 3708 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request"); 3709 return -EINVAL; 3710 } 3711 3712 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX, 3713 ifla_policy, extack); 3714 if (err) 3715 return err; 3716 3717 for (i = 0; i <= IFLA_MAX; i++) { 3718 if (!tb[i]) 3719 continue; 3720 3721 switch (i) { 3722 case IFLA_IFNAME: 3723 case IFLA_ALT_IFNAME: 3724 case IFLA_EXT_MASK: 3725 case IFLA_TARGET_NETNSID: 3726 break; 3727 default: 3728 NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request"); 3729 return -EINVAL; 3730 } 3731 } 3732 3733 return 0; 3734 } 3735 3736 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3737 struct netlink_ext_ack *extack) 3738 { 3739 struct net *net = sock_net(skb->sk); 3740 struct net *tgt_net = net; 3741 struct ifinfomsg *ifm; 3742 struct nlattr *tb[IFLA_MAX+1]; 3743 struct net_device *dev = NULL; 3744 struct sk_buff *nskb; 3745 int netnsid = -1; 3746 int err; 3747 u32 ext_filter_mask = 0; 3748 3749 err = rtnl_valid_getlink_req(skb, nlh, tb, extack); 3750 if (err < 0) 3751 return err; 3752 3753 err = rtnl_ensure_unique_netns(tb, extack, true); 3754 if (err < 0) 3755 return err; 3756 3757 if (tb[IFLA_TARGET_NETNSID]) { 3758 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 3759 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid); 3760 if (IS_ERR(tgt_net)) 3761 return PTR_ERR(tgt_net); 3762 } 3763 3764 if (tb[IFLA_EXT_MASK]) 3765 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 3766 3767 err = -EINVAL; 3768 ifm = nlmsg_data(nlh); 3769 if (ifm->ifi_index > 0) 3770 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 3771 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3772 dev = rtnl_dev_get(tgt_net, tb); 3773 else 3774 goto out; 3775 3776 err = -ENODEV; 3777 if (dev == NULL) 3778 goto out; 3779 3780 err = -ENOBUFS; 3781 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 3782 if (nskb == NULL) 3783 goto out; 3784 3785 err = rtnl_fill_ifinfo(nskb, dev, net, 3786 RTM_NEWLINK, NETLINK_CB(skb).portid, 3787 nlh->nlmsg_seq, 0, 0, ext_filter_mask, 3788 0, NULL, 0, netnsid, GFP_KERNEL); 3789 if (err < 0) { 3790 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 3791 WARN_ON(err == -EMSGSIZE); 3792 kfree_skb(nskb); 3793 } else 3794 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 3795 out: 3796 if (netnsid >= 0) 3797 put_net(tgt_net); 3798 3799 return err; 3800 } 3801 3802 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr, 3803 bool *changed, struct netlink_ext_ack *extack) 3804 { 3805 char *alt_ifname; 3806 size_t size; 3807 int err; 3808 3809 err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack); 3810 if (err) 3811 return err; 3812 3813 if (cmd == RTM_NEWLINKPROP) { 3814 size = rtnl_prop_list_size(dev); 3815 size += nla_total_size(ALTIFNAMSIZ); 3816 if (size >= U16_MAX) { 3817 NL_SET_ERR_MSG(extack, 3818 "effective property list too long"); 3819 return -EINVAL; 3820 } 3821 } 3822 3823 alt_ifname = nla_strdup(attr, GFP_KERNEL_ACCOUNT); 3824 if (!alt_ifname) 3825 return -ENOMEM; 3826 3827 if (cmd == RTM_NEWLINKPROP) { 3828 err = netdev_name_node_alt_create(dev, alt_ifname); 3829 if (!err) 3830 alt_ifname = NULL; 3831 } else if (cmd == RTM_DELLINKPROP) { 3832 err = netdev_name_node_alt_destroy(dev, alt_ifname); 3833 } else { 3834 WARN_ON_ONCE(1); 3835 err = -EINVAL; 3836 } 3837 3838 kfree(alt_ifname); 3839 if (!err) 3840 *changed = true; 3841 return err; 3842 } 3843 3844 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh, 3845 struct netlink_ext_ack *extack) 3846 { 3847 struct net *net = sock_net(skb->sk); 3848 struct nlattr *tb[IFLA_MAX + 1]; 3849 struct net_device *dev; 3850 struct ifinfomsg *ifm; 3851 bool changed = false; 3852 struct nlattr *attr; 3853 int err, rem; 3854 3855 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack); 3856 if (err) 3857 return err; 3858 3859 err = rtnl_ensure_unique_netns(tb, extack, true); 3860 if (err) 3861 return err; 3862 3863 ifm = nlmsg_data(nlh); 3864 if (ifm->ifi_index > 0) 3865 dev = __dev_get_by_index(net, ifm->ifi_index); 3866 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3867 dev = rtnl_dev_get(net, tb); 3868 else 3869 return -EINVAL; 3870 3871 if (!dev) 3872 return -ENODEV; 3873 3874 if (!tb[IFLA_PROP_LIST]) 3875 return 0; 3876 3877 nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) { 3878 switch (nla_type(attr)) { 3879 case IFLA_ALT_IFNAME: 3880 err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack); 3881 if (err) 3882 return err; 3883 break; 3884 } 3885 } 3886 3887 if (changed) 3888 netdev_state_change(dev); 3889 return 0; 3890 } 3891 3892 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh, 3893 struct netlink_ext_ack *extack) 3894 { 3895 return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack); 3896 } 3897 3898 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh, 3899 struct netlink_ext_ack *extack) 3900 { 3901 return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack); 3902 } 3903 3904 static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 3905 { 3906 struct net *net = sock_net(skb->sk); 3907 size_t min_ifinfo_dump_size = 0; 3908 struct nlattr *tb[IFLA_MAX+1]; 3909 u32 ext_filter_mask = 0; 3910 struct net_device *dev; 3911 int hdrlen; 3912 3913 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 3914 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 3915 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 3916 3917 if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) { 3918 if (tb[IFLA_EXT_MASK]) 3919 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 3920 } 3921 3922 if (!ext_filter_mask) 3923 return NLMSG_GOODSIZE; 3924 /* 3925 * traverse the list of net devices and compute the minimum 3926 * buffer size based upon the filter mask. 3927 */ 3928 rcu_read_lock(); 3929 for_each_netdev_rcu(net, dev) { 3930 min_ifinfo_dump_size = max(min_ifinfo_dump_size, 3931 if_nlmsg_size(dev, ext_filter_mask)); 3932 } 3933 rcu_read_unlock(); 3934 3935 return nlmsg_total_size(min_ifinfo_dump_size); 3936 } 3937 3938 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 3939 { 3940 int idx; 3941 int s_idx = cb->family; 3942 int type = cb->nlh->nlmsg_type - RTM_BASE; 3943 int ret = 0; 3944 3945 if (s_idx == 0) 3946 s_idx = 1; 3947 3948 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 3949 struct rtnl_link __rcu **tab; 3950 struct rtnl_link *link; 3951 rtnl_dumpit_func dumpit; 3952 3953 if (idx < s_idx || idx == PF_PACKET) 3954 continue; 3955 3956 if (type < 0 || type >= RTM_NR_MSGTYPES) 3957 continue; 3958 3959 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]); 3960 if (!tab) 3961 continue; 3962 3963 link = rcu_dereference_rtnl(tab[type]); 3964 if (!link) 3965 continue; 3966 3967 dumpit = link->dumpit; 3968 if (!dumpit) 3969 continue; 3970 3971 if (idx > s_idx) { 3972 memset(&cb->args[0], 0, sizeof(cb->args)); 3973 cb->prev_seq = 0; 3974 cb->seq = 0; 3975 } 3976 ret = dumpit(skb, cb); 3977 if (ret) 3978 break; 3979 } 3980 cb->family = idx; 3981 3982 return skb->len ? : ret; 3983 } 3984 3985 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 3986 unsigned int change, 3987 u32 event, gfp_t flags, int *new_nsid, 3988 int new_ifindex, u32 portid, 3989 const struct nlmsghdr *nlh) 3990 { 3991 struct net *net = dev_net(dev); 3992 struct sk_buff *skb; 3993 int err = -ENOBUFS; 3994 u32 seq = 0; 3995 3996 skb = nlmsg_new(if_nlmsg_size(dev, 0), flags); 3997 if (skb == NULL) 3998 goto errout; 3999 4000 if (nlmsg_report(nlh)) 4001 seq = nlmsg_seq(nlh); 4002 else 4003 portid = 0; 4004 4005 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev), 4006 type, portid, seq, change, 0, 0, event, 4007 new_nsid, new_ifindex, -1, flags); 4008 if (err < 0) { 4009 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 4010 WARN_ON(err == -EMSGSIZE); 4011 kfree_skb(skb); 4012 goto errout; 4013 } 4014 return skb; 4015 errout: 4016 if (err < 0) 4017 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 4018 return NULL; 4019 } 4020 4021 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags, 4022 u32 portid, const struct nlmsghdr *nlh) 4023 { 4024 struct net *net = dev_net(dev); 4025 4026 rtnl_notify(skb, net, portid, RTNLGRP_LINK, nlh, flags); 4027 } 4028 4029 static void rtmsg_ifinfo_event(int type, struct net_device *dev, 4030 unsigned int change, u32 event, 4031 gfp_t flags, int *new_nsid, int new_ifindex, 4032 u32 portid, const struct nlmsghdr *nlh) 4033 { 4034 struct sk_buff *skb; 4035 4036 if (dev->reg_state != NETREG_REGISTERED) 4037 return; 4038 4039 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid, 4040 new_ifindex, portid, nlh); 4041 if (skb) 4042 rtmsg_ifinfo_send(skb, dev, flags, portid, nlh); 4043 } 4044 4045 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 4046 gfp_t flags, u32 portid, const struct nlmsghdr *nlh) 4047 { 4048 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 4049 NULL, 0, portid, nlh); 4050 } 4051 4052 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 4053 gfp_t flags, int *new_nsid, int new_ifindex) 4054 { 4055 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 4056 new_nsid, new_ifindex, 0, NULL); 4057 } 4058 4059 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 4060 struct net_device *dev, 4061 u8 *addr, u16 vid, u32 pid, u32 seq, 4062 int type, unsigned int flags, 4063 int nlflags, u16 ndm_state) 4064 { 4065 struct nlmsghdr *nlh; 4066 struct ndmsg *ndm; 4067 4068 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 4069 if (!nlh) 4070 return -EMSGSIZE; 4071 4072 ndm = nlmsg_data(nlh); 4073 ndm->ndm_family = AF_BRIDGE; 4074 ndm->ndm_pad1 = 0; 4075 ndm->ndm_pad2 = 0; 4076 ndm->ndm_flags = flags; 4077 ndm->ndm_type = 0; 4078 ndm->ndm_ifindex = dev->ifindex; 4079 ndm->ndm_state = ndm_state; 4080 4081 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 4082 goto nla_put_failure; 4083 if (vid) 4084 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 4085 goto nla_put_failure; 4086 4087 nlmsg_end(skb, nlh); 4088 return 0; 4089 4090 nla_put_failure: 4091 nlmsg_cancel(skb, nlh); 4092 return -EMSGSIZE; 4093 } 4094 4095 static inline size_t rtnl_fdb_nlmsg_size(void) 4096 { 4097 return NLMSG_ALIGN(sizeof(struct ndmsg)) + 4098 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */ 4099 nla_total_size(sizeof(u16)) + /* NDA_VLAN */ 4100 0; 4101 } 4102 4103 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 4104 u16 ndm_state) 4105 { 4106 struct net *net = dev_net(dev); 4107 struct sk_buff *skb; 4108 int err = -ENOBUFS; 4109 4110 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 4111 if (!skb) 4112 goto errout; 4113 4114 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 4115 0, 0, type, NTF_SELF, 0, ndm_state); 4116 if (err < 0) { 4117 kfree_skb(skb); 4118 goto errout; 4119 } 4120 4121 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 4122 return; 4123 errout: 4124 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 4125 } 4126 4127 /* 4128 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 4129 */ 4130 int ndo_dflt_fdb_add(struct ndmsg *ndm, 4131 struct nlattr *tb[], 4132 struct net_device *dev, 4133 const unsigned char *addr, u16 vid, 4134 u16 flags) 4135 { 4136 int err = -EINVAL; 4137 4138 /* If aging addresses are supported device will need to 4139 * implement its own handler for this. 4140 */ 4141 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 4142 netdev_info(dev, "default FDB implementation only supports local addresses\n"); 4143 return err; 4144 } 4145 4146 if (tb[NDA_FLAGS_EXT]) { 4147 netdev_info(dev, "invalid flags given to default FDB implementation\n"); 4148 return err; 4149 } 4150 4151 if (vid) { 4152 netdev_info(dev, "vlans aren't supported yet for dev_uc|mc_add()\n"); 4153 return err; 4154 } 4155 4156 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 4157 err = dev_uc_add_excl(dev, addr); 4158 else if (is_multicast_ether_addr(addr)) 4159 err = dev_mc_add_excl(dev, addr); 4160 4161 /* Only return duplicate errors if NLM_F_EXCL is set */ 4162 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 4163 err = 0; 4164 4165 return err; 4166 } 4167 EXPORT_SYMBOL(ndo_dflt_fdb_add); 4168 4169 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid, 4170 struct netlink_ext_ack *extack) 4171 { 4172 u16 vid = 0; 4173 4174 if (vlan_attr) { 4175 if (nla_len(vlan_attr) != sizeof(u16)) { 4176 NL_SET_ERR_MSG(extack, "invalid vlan attribute size"); 4177 return -EINVAL; 4178 } 4179 4180 vid = nla_get_u16(vlan_attr); 4181 4182 if (!vid || vid >= VLAN_VID_MASK) { 4183 NL_SET_ERR_MSG(extack, "invalid vlan id"); 4184 return -EINVAL; 4185 } 4186 } 4187 *p_vid = vid; 4188 return 0; 4189 } 4190 4191 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, 4192 struct netlink_ext_ack *extack) 4193 { 4194 struct net *net = sock_net(skb->sk); 4195 struct ndmsg *ndm; 4196 struct nlattr *tb[NDA_MAX+1]; 4197 struct net_device *dev; 4198 u8 *addr; 4199 u16 vid; 4200 int err; 4201 4202 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, 4203 extack); 4204 if (err < 0) 4205 return err; 4206 4207 ndm = nlmsg_data(nlh); 4208 if (ndm->ndm_ifindex == 0) { 4209 NL_SET_ERR_MSG(extack, "invalid ifindex"); 4210 return -EINVAL; 4211 } 4212 4213 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 4214 if (dev == NULL) { 4215 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4216 return -ENODEV; 4217 } 4218 4219 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 4220 NL_SET_ERR_MSG(extack, "invalid address"); 4221 return -EINVAL; 4222 } 4223 4224 if (dev->type != ARPHRD_ETHER) { 4225 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices"); 4226 return -EINVAL; 4227 } 4228 4229 addr = nla_data(tb[NDA_LLADDR]); 4230 4231 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 4232 if (err) 4233 return err; 4234 4235 err = -EOPNOTSUPP; 4236 4237 /* Support fdb on master device the net/bridge default case */ 4238 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 4239 netif_is_bridge_port(dev)) { 4240 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4241 const struct net_device_ops *ops = br_dev->netdev_ops; 4242 4243 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 4244 nlh->nlmsg_flags, extack); 4245 if (err) 4246 goto out; 4247 else 4248 ndm->ndm_flags &= ~NTF_MASTER; 4249 } 4250 4251 /* Embedded bridge, macvlan, and any other device support */ 4252 if ((ndm->ndm_flags & NTF_SELF)) { 4253 if (dev->netdev_ops->ndo_fdb_add) 4254 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 4255 vid, 4256 nlh->nlmsg_flags, 4257 extack); 4258 else 4259 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 4260 nlh->nlmsg_flags); 4261 4262 if (!err) { 4263 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 4264 ndm->ndm_state); 4265 ndm->ndm_flags &= ~NTF_SELF; 4266 } 4267 } 4268 out: 4269 return err; 4270 } 4271 4272 /* 4273 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 4274 */ 4275 int ndo_dflt_fdb_del(struct ndmsg *ndm, 4276 struct nlattr *tb[], 4277 struct net_device *dev, 4278 const unsigned char *addr, u16 vid) 4279 { 4280 int err = -EINVAL; 4281 4282 /* If aging addresses are supported device will need to 4283 * implement its own handler for this. 4284 */ 4285 if (!(ndm->ndm_state & NUD_PERMANENT)) { 4286 netdev_info(dev, "default FDB implementation only supports local addresses\n"); 4287 return err; 4288 } 4289 4290 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 4291 err = dev_uc_del(dev, addr); 4292 else if (is_multicast_ether_addr(addr)) 4293 err = dev_mc_del(dev, addr); 4294 4295 return err; 4296 } 4297 EXPORT_SYMBOL(ndo_dflt_fdb_del); 4298 4299 static const struct nla_policy fdb_del_bulk_policy[NDA_MAX + 1] = { 4300 [NDA_VLAN] = { .type = NLA_U16 }, 4301 [NDA_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1), 4302 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 }, 4303 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 }, 4304 }; 4305 4306 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, 4307 struct netlink_ext_ack *extack) 4308 { 4309 bool del_bulk = !!(nlh->nlmsg_flags & NLM_F_BULK); 4310 struct net *net = sock_net(skb->sk); 4311 const struct net_device_ops *ops; 4312 struct ndmsg *ndm; 4313 struct nlattr *tb[NDA_MAX+1]; 4314 struct net_device *dev; 4315 __u8 *addr = NULL; 4316 int err; 4317 u16 vid; 4318 4319 if (!netlink_capable(skb, CAP_NET_ADMIN)) 4320 return -EPERM; 4321 4322 if (!del_bulk) { 4323 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, 4324 NULL, extack); 4325 } else { 4326 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, 4327 fdb_del_bulk_policy, extack); 4328 } 4329 if (err < 0) 4330 return err; 4331 4332 ndm = nlmsg_data(nlh); 4333 if (ndm->ndm_ifindex == 0) { 4334 NL_SET_ERR_MSG(extack, "invalid ifindex"); 4335 return -EINVAL; 4336 } 4337 4338 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 4339 if (dev == NULL) { 4340 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4341 return -ENODEV; 4342 } 4343 4344 if (!del_bulk) { 4345 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 4346 NL_SET_ERR_MSG(extack, "invalid address"); 4347 return -EINVAL; 4348 } 4349 addr = nla_data(tb[NDA_LLADDR]); 4350 } 4351 4352 if (dev->type != ARPHRD_ETHER) { 4353 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices"); 4354 return -EINVAL; 4355 } 4356 4357 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 4358 if (err) 4359 return err; 4360 4361 err = -EOPNOTSUPP; 4362 4363 /* Support fdb on master device the net/bridge default case */ 4364 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 4365 netif_is_bridge_port(dev)) { 4366 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4367 4368 ops = br_dev->netdev_ops; 4369 if (!del_bulk) { 4370 if (ops->ndo_fdb_del) 4371 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid, extack); 4372 } else { 4373 if (ops->ndo_fdb_del_bulk) 4374 err = ops->ndo_fdb_del_bulk(ndm, tb, dev, vid, 4375 extack); 4376 } 4377 4378 if (err) 4379 goto out; 4380 else 4381 ndm->ndm_flags &= ~NTF_MASTER; 4382 } 4383 4384 /* Embedded bridge, macvlan, and any other device support */ 4385 if (ndm->ndm_flags & NTF_SELF) { 4386 ops = dev->netdev_ops; 4387 if (!del_bulk) { 4388 if (ops->ndo_fdb_del) 4389 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid, extack); 4390 else 4391 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 4392 } else { 4393 /* in case err was cleared by NTF_MASTER call */ 4394 err = -EOPNOTSUPP; 4395 if (ops->ndo_fdb_del_bulk) 4396 err = ops->ndo_fdb_del_bulk(ndm, tb, dev, vid, 4397 extack); 4398 } 4399 4400 if (!err) { 4401 if (!del_bulk) 4402 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 4403 ndm->ndm_state); 4404 ndm->ndm_flags &= ~NTF_SELF; 4405 } 4406 } 4407 out: 4408 return err; 4409 } 4410 4411 static int nlmsg_populate_fdb(struct sk_buff *skb, 4412 struct netlink_callback *cb, 4413 struct net_device *dev, 4414 int *idx, 4415 struct netdev_hw_addr_list *list) 4416 { 4417 struct netdev_hw_addr *ha; 4418 int err; 4419 u32 portid, seq; 4420 4421 portid = NETLINK_CB(cb->skb).portid; 4422 seq = cb->nlh->nlmsg_seq; 4423 4424 list_for_each_entry(ha, &list->list, list) { 4425 if (*idx < cb->args[2]) 4426 goto skip; 4427 4428 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 4429 portid, seq, 4430 RTM_NEWNEIGH, NTF_SELF, 4431 NLM_F_MULTI, NUD_PERMANENT); 4432 if (err < 0) 4433 return err; 4434 skip: 4435 *idx += 1; 4436 } 4437 return 0; 4438 } 4439 4440 /** 4441 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 4442 * @skb: socket buffer to store message in 4443 * @cb: netlink callback 4444 * @dev: netdevice 4445 * @filter_dev: ignored 4446 * @idx: the number of FDB table entries dumped is added to *@idx 4447 * 4448 * Default netdevice operation to dump the existing unicast address list. 4449 * Returns number of addresses from list put in skb. 4450 */ 4451 int ndo_dflt_fdb_dump(struct sk_buff *skb, 4452 struct netlink_callback *cb, 4453 struct net_device *dev, 4454 struct net_device *filter_dev, 4455 int *idx) 4456 { 4457 int err; 4458 4459 if (dev->type != ARPHRD_ETHER) 4460 return -EINVAL; 4461 4462 netif_addr_lock_bh(dev); 4463 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc); 4464 if (err) 4465 goto out; 4466 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc); 4467 out: 4468 netif_addr_unlock_bh(dev); 4469 return err; 4470 } 4471 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 4472 4473 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh, 4474 int *br_idx, int *brport_idx, 4475 struct netlink_ext_ack *extack) 4476 { 4477 struct nlattr *tb[NDA_MAX + 1]; 4478 struct ndmsg *ndm; 4479 int err, i; 4480 4481 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { 4482 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request"); 4483 return -EINVAL; 4484 } 4485 4486 ndm = nlmsg_data(nlh); 4487 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || 4488 ndm->ndm_flags || ndm->ndm_type) { 4489 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request"); 4490 return -EINVAL; 4491 } 4492 4493 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, 4494 NDA_MAX, NULL, extack); 4495 if (err < 0) 4496 return err; 4497 4498 *brport_idx = ndm->ndm_ifindex; 4499 for (i = 0; i <= NDA_MAX; ++i) { 4500 if (!tb[i]) 4501 continue; 4502 4503 switch (i) { 4504 case NDA_IFINDEX: 4505 if (nla_len(tb[i]) != sizeof(u32)) { 4506 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request"); 4507 return -EINVAL; 4508 } 4509 *brport_idx = nla_get_u32(tb[NDA_IFINDEX]); 4510 break; 4511 case NDA_MASTER: 4512 if (nla_len(tb[i]) != sizeof(u32)) { 4513 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request"); 4514 return -EINVAL; 4515 } 4516 *br_idx = nla_get_u32(tb[NDA_MASTER]); 4517 break; 4518 default: 4519 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request"); 4520 return -EINVAL; 4521 } 4522 } 4523 4524 return 0; 4525 } 4526 4527 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh, 4528 int *br_idx, int *brport_idx, 4529 struct netlink_ext_ack *extack) 4530 { 4531 struct nlattr *tb[IFLA_MAX+1]; 4532 int err; 4533 4534 /* A hack to preserve kernel<->userspace interface. 4535 * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0. 4536 * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails. 4537 * So, check for ndmsg with an optional u32 attribute (not used here). 4538 * Fortunately these sizes don't conflict with the size of ifinfomsg 4539 * with an optional attribute. 4540 */ 4541 if (nlmsg_len(nlh) != sizeof(struct ndmsg) && 4542 (nlmsg_len(nlh) != sizeof(struct ndmsg) + 4543 nla_attr_size(sizeof(u32)))) { 4544 struct ifinfomsg *ifm; 4545 4546 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg), 4547 tb, IFLA_MAX, ifla_policy, 4548 extack); 4549 if (err < 0) { 4550 return -EINVAL; 4551 } else if (err == 0) { 4552 if (tb[IFLA_MASTER]) 4553 *br_idx = nla_get_u32(tb[IFLA_MASTER]); 4554 } 4555 4556 ifm = nlmsg_data(nlh); 4557 *brport_idx = ifm->ifi_index; 4558 } 4559 return 0; 4560 } 4561 4562 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 4563 { 4564 struct net_device *dev; 4565 struct net_device *br_dev = NULL; 4566 const struct net_device_ops *ops = NULL; 4567 const struct net_device_ops *cops = NULL; 4568 struct net *net = sock_net(skb->sk); 4569 struct hlist_head *head; 4570 int brport_idx = 0; 4571 int br_idx = 0; 4572 int h, s_h; 4573 int idx = 0, s_idx; 4574 int err = 0; 4575 int fidx = 0; 4576 4577 if (cb->strict_check) 4578 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx, 4579 cb->extack); 4580 else 4581 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx, 4582 cb->extack); 4583 if (err < 0) 4584 return err; 4585 4586 if (br_idx) { 4587 br_dev = __dev_get_by_index(net, br_idx); 4588 if (!br_dev) 4589 return -ENODEV; 4590 4591 ops = br_dev->netdev_ops; 4592 } 4593 4594 s_h = cb->args[0]; 4595 s_idx = cb->args[1]; 4596 4597 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4598 idx = 0; 4599 head = &net->dev_index_head[h]; 4600 hlist_for_each_entry(dev, head, index_hlist) { 4601 4602 if (brport_idx && (dev->ifindex != brport_idx)) 4603 continue; 4604 4605 if (!br_idx) { /* user did not specify a specific bridge */ 4606 if (netif_is_bridge_port(dev)) { 4607 br_dev = netdev_master_upper_dev_get(dev); 4608 cops = br_dev->netdev_ops; 4609 } 4610 } else { 4611 if (dev != br_dev && 4612 !netif_is_bridge_port(dev)) 4613 continue; 4614 4615 if (br_dev != netdev_master_upper_dev_get(dev) && 4616 !netif_is_bridge_master(dev)) 4617 continue; 4618 cops = ops; 4619 } 4620 4621 if (idx < s_idx) 4622 goto cont; 4623 4624 if (netif_is_bridge_port(dev)) { 4625 if (cops && cops->ndo_fdb_dump) { 4626 err = cops->ndo_fdb_dump(skb, cb, 4627 br_dev, dev, 4628 &fidx); 4629 if (err == -EMSGSIZE) 4630 goto out; 4631 } 4632 } 4633 4634 if (dev->netdev_ops->ndo_fdb_dump) 4635 err = dev->netdev_ops->ndo_fdb_dump(skb, cb, 4636 dev, NULL, 4637 &fidx); 4638 else 4639 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, 4640 &fidx); 4641 if (err == -EMSGSIZE) 4642 goto out; 4643 4644 cops = NULL; 4645 4646 /* reset fdb offset to 0 for rest of the interfaces */ 4647 cb->args[2] = 0; 4648 fidx = 0; 4649 cont: 4650 idx++; 4651 } 4652 } 4653 4654 out: 4655 cb->args[0] = h; 4656 cb->args[1] = idx; 4657 cb->args[2] = fidx; 4658 4659 return skb->len; 4660 } 4661 4662 static int valid_fdb_get_strict(const struct nlmsghdr *nlh, 4663 struct nlattr **tb, u8 *ndm_flags, 4664 int *br_idx, int *brport_idx, u8 **addr, 4665 u16 *vid, struct netlink_ext_ack *extack) 4666 { 4667 struct ndmsg *ndm; 4668 int err, i; 4669 4670 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { 4671 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request"); 4672 return -EINVAL; 4673 } 4674 4675 ndm = nlmsg_data(nlh); 4676 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || 4677 ndm->ndm_type) { 4678 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request"); 4679 return -EINVAL; 4680 } 4681 4682 if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) { 4683 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request"); 4684 return -EINVAL; 4685 } 4686 4687 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, 4688 NDA_MAX, nda_policy, extack); 4689 if (err < 0) 4690 return err; 4691 4692 *ndm_flags = ndm->ndm_flags; 4693 *brport_idx = ndm->ndm_ifindex; 4694 for (i = 0; i <= NDA_MAX; ++i) { 4695 if (!tb[i]) 4696 continue; 4697 4698 switch (i) { 4699 case NDA_MASTER: 4700 *br_idx = nla_get_u32(tb[i]); 4701 break; 4702 case NDA_LLADDR: 4703 if (nla_len(tb[i]) != ETH_ALEN) { 4704 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request"); 4705 return -EINVAL; 4706 } 4707 *addr = nla_data(tb[i]); 4708 break; 4709 case NDA_VLAN: 4710 err = fdb_vid_parse(tb[i], vid, extack); 4711 if (err) 4712 return err; 4713 break; 4714 case NDA_VNI: 4715 break; 4716 default: 4717 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request"); 4718 return -EINVAL; 4719 } 4720 } 4721 4722 return 0; 4723 } 4724 4725 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4726 struct netlink_ext_ack *extack) 4727 { 4728 struct net_device *dev = NULL, *br_dev = NULL; 4729 const struct net_device_ops *ops = NULL; 4730 struct net *net = sock_net(in_skb->sk); 4731 struct nlattr *tb[NDA_MAX + 1]; 4732 struct sk_buff *skb; 4733 int brport_idx = 0; 4734 u8 ndm_flags = 0; 4735 int br_idx = 0; 4736 u8 *addr = NULL; 4737 u16 vid = 0; 4738 int err; 4739 4740 err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx, 4741 &brport_idx, &addr, &vid, extack); 4742 if (err < 0) 4743 return err; 4744 4745 if (!addr) { 4746 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request"); 4747 return -EINVAL; 4748 } 4749 4750 if (brport_idx) { 4751 dev = __dev_get_by_index(net, brport_idx); 4752 if (!dev) { 4753 NL_SET_ERR_MSG(extack, "Unknown device ifindex"); 4754 return -ENODEV; 4755 } 4756 } 4757 4758 if (br_idx) { 4759 if (dev) { 4760 NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive"); 4761 return -EINVAL; 4762 } 4763 4764 br_dev = __dev_get_by_index(net, br_idx); 4765 if (!br_dev) { 4766 NL_SET_ERR_MSG(extack, "Invalid master ifindex"); 4767 return -EINVAL; 4768 } 4769 ops = br_dev->netdev_ops; 4770 } 4771 4772 if (dev) { 4773 if (!ndm_flags || (ndm_flags & NTF_MASTER)) { 4774 if (!netif_is_bridge_port(dev)) { 4775 NL_SET_ERR_MSG(extack, "Device is not a bridge port"); 4776 return -EINVAL; 4777 } 4778 br_dev = netdev_master_upper_dev_get(dev); 4779 if (!br_dev) { 4780 NL_SET_ERR_MSG(extack, "Master of device not found"); 4781 return -EINVAL; 4782 } 4783 ops = br_dev->netdev_ops; 4784 } else { 4785 if (!(ndm_flags & NTF_SELF)) { 4786 NL_SET_ERR_MSG(extack, "Missing NTF_SELF"); 4787 return -EINVAL; 4788 } 4789 ops = dev->netdev_ops; 4790 } 4791 } 4792 4793 if (!br_dev && !dev) { 4794 NL_SET_ERR_MSG(extack, "No device specified"); 4795 return -ENODEV; 4796 } 4797 4798 if (!ops || !ops->ndo_fdb_get) { 4799 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device"); 4800 return -EOPNOTSUPP; 4801 } 4802 4803 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 4804 if (!skb) 4805 return -ENOBUFS; 4806 4807 if (br_dev) 4808 dev = br_dev; 4809 err = ops->ndo_fdb_get(skb, tb, dev, addr, vid, 4810 NETLINK_CB(in_skb).portid, 4811 nlh->nlmsg_seq, extack); 4812 if (err) 4813 goto out; 4814 4815 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4816 out: 4817 kfree_skb(skb); 4818 return err; 4819 } 4820 4821 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 4822 unsigned int attrnum, unsigned int flag) 4823 { 4824 if (mask & flag) 4825 return nla_put_u8(skb, attrnum, !!(flags & flag)); 4826 return 0; 4827 } 4828 4829 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 4830 struct net_device *dev, u16 mode, 4831 u32 flags, u32 mask, int nlflags, 4832 u32 filter_mask, 4833 int (*vlan_fill)(struct sk_buff *skb, 4834 struct net_device *dev, 4835 u32 filter_mask)) 4836 { 4837 struct nlmsghdr *nlh; 4838 struct ifinfomsg *ifm; 4839 struct nlattr *br_afspec; 4840 struct nlattr *protinfo; 4841 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 4842 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4843 int err = 0; 4844 4845 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 4846 if (nlh == NULL) 4847 return -EMSGSIZE; 4848 4849 ifm = nlmsg_data(nlh); 4850 ifm->ifi_family = AF_BRIDGE; 4851 ifm->__ifi_pad = 0; 4852 ifm->ifi_type = dev->type; 4853 ifm->ifi_index = dev->ifindex; 4854 ifm->ifi_flags = dev_get_flags(dev); 4855 ifm->ifi_change = 0; 4856 4857 4858 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4859 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4860 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 4861 (br_dev && 4862 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 4863 (dev->addr_len && 4864 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4865 (dev->ifindex != dev_get_iflink(dev) && 4866 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 4867 goto nla_put_failure; 4868 4869 br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC); 4870 if (!br_afspec) 4871 goto nla_put_failure; 4872 4873 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 4874 nla_nest_cancel(skb, br_afspec); 4875 goto nla_put_failure; 4876 } 4877 4878 if (mode != BRIDGE_MODE_UNDEF) { 4879 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 4880 nla_nest_cancel(skb, br_afspec); 4881 goto nla_put_failure; 4882 } 4883 } 4884 if (vlan_fill) { 4885 err = vlan_fill(skb, dev, filter_mask); 4886 if (err) { 4887 nla_nest_cancel(skb, br_afspec); 4888 goto nla_put_failure; 4889 } 4890 } 4891 nla_nest_end(skb, br_afspec); 4892 4893 protinfo = nla_nest_start(skb, IFLA_PROTINFO); 4894 if (!protinfo) 4895 goto nla_put_failure; 4896 4897 if (brport_nla_put_flag(skb, flags, mask, 4898 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 4899 brport_nla_put_flag(skb, flags, mask, 4900 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 4901 brport_nla_put_flag(skb, flags, mask, 4902 IFLA_BRPORT_FAST_LEAVE, 4903 BR_MULTICAST_FAST_LEAVE) || 4904 brport_nla_put_flag(skb, flags, mask, 4905 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 4906 brport_nla_put_flag(skb, flags, mask, 4907 IFLA_BRPORT_LEARNING, BR_LEARNING) || 4908 brport_nla_put_flag(skb, flags, mask, 4909 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 4910 brport_nla_put_flag(skb, flags, mask, 4911 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 4912 brport_nla_put_flag(skb, flags, mask, 4913 IFLA_BRPORT_PROXYARP, BR_PROXYARP) || 4914 brport_nla_put_flag(skb, flags, mask, 4915 IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) || 4916 brport_nla_put_flag(skb, flags, mask, 4917 IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) { 4918 nla_nest_cancel(skb, protinfo); 4919 goto nla_put_failure; 4920 } 4921 4922 nla_nest_end(skb, protinfo); 4923 4924 nlmsg_end(skb, nlh); 4925 return 0; 4926 nla_put_failure: 4927 nlmsg_cancel(skb, nlh); 4928 return err ? err : -EMSGSIZE; 4929 } 4930 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 4931 4932 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh, 4933 bool strict_check, u32 *filter_mask, 4934 struct netlink_ext_ack *extack) 4935 { 4936 struct nlattr *tb[IFLA_MAX+1]; 4937 int err, i; 4938 4939 if (strict_check) { 4940 struct ifinfomsg *ifm; 4941 4942 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 4943 NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump"); 4944 return -EINVAL; 4945 } 4946 4947 ifm = nlmsg_data(nlh); 4948 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 4949 ifm->ifi_change || ifm->ifi_index) { 4950 NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request"); 4951 return -EINVAL; 4952 } 4953 4954 err = nlmsg_parse_deprecated_strict(nlh, 4955 sizeof(struct ifinfomsg), 4956 tb, IFLA_MAX, ifla_policy, 4957 extack); 4958 } else { 4959 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg), 4960 tb, IFLA_MAX, ifla_policy, 4961 extack); 4962 } 4963 if (err < 0) 4964 return err; 4965 4966 /* new attributes should only be added with strict checking */ 4967 for (i = 0; i <= IFLA_MAX; ++i) { 4968 if (!tb[i]) 4969 continue; 4970 4971 switch (i) { 4972 case IFLA_EXT_MASK: 4973 *filter_mask = nla_get_u32(tb[i]); 4974 break; 4975 default: 4976 if (strict_check) { 4977 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request"); 4978 return -EINVAL; 4979 } 4980 } 4981 } 4982 4983 return 0; 4984 } 4985 4986 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 4987 { 4988 const struct nlmsghdr *nlh = cb->nlh; 4989 struct net *net = sock_net(skb->sk); 4990 struct net_device *dev; 4991 int idx = 0; 4992 u32 portid = NETLINK_CB(cb->skb).portid; 4993 u32 seq = nlh->nlmsg_seq; 4994 u32 filter_mask = 0; 4995 int err; 4996 4997 err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask, 4998 cb->extack); 4999 if (err < 0 && cb->strict_check) 5000 return err; 5001 5002 rcu_read_lock(); 5003 for_each_netdev_rcu(net, dev) { 5004 const struct net_device_ops *ops = dev->netdev_ops; 5005 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 5006 5007 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 5008 if (idx >= cb->args[0]) { 5009 err = br_dev->netdev_ops->ndo_bridge_getlink( 5010 skb, portid, seq, dev, 5011 filter_mask, NLM_F_MULTI); 5012 if (err < 0 && err != -EOPNOTSUPP) { 5013 if (likely(skb->len)) 5014 break; 5015 5016 goto out_err; 5017 } 5018 } 5019 idx++; 5020 } 5021 5022 if (ops->ndo_bridge_getlink) { 5023 if (idx >= cb->args[0]) { 5024 err = ops->ndo_bridge_getlink(skb, portid, 5025 seq, dev, 5026 filter_mask, 5027 NLM_F_MULTI); 5028 if (err < 0 && err != -EOPNOTSUPP) { 5029 if (likely(skb->len)) 5030 break; 5031 5032 goto out_err; 5033 } 5034 } 5035 idx++; 5036 } 5037 } 5038 err = skb->len; 5039 out_err: 5040 rcu_read_unlock(); 5041 cb->args[0] = idx; 5042 5043 return err; 5044 } 5045 5046 static inline size_t bridge_nlmsg_size(void) 5047 { 5048 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5049 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5050 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5051 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 5052 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 5053 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 5054 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 5055 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 5056 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 5057 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 5058 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 5059 } 5060 5061 static int rtnl_bridge_notify(struct net_device *dev) 5062 { 5063 struct net *net = dev_net(dev); 5064 struct sk_buff *skb; 5065 int err = -EOPNOTSUPP; 5066 5067 if (!dev->netdev_ops->ndo_bridge_getlink) 5068 return 0; 5069 5070 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 5071 if (!skb) { 5072 err = -ENOMEM; 5073 goto errout; 5074 } 5075 5076 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 5077 if (err < 0) 5078 goto errout; 5079 5080 /* Notification info is only filled for bridge ports, not the bridge 5081 * device itself. Therefore, a zero notification length is valid and 5082 * should not result in an error. 5083 */ 5084 if (!skb->len) 5085 goto errout; 5086 5087 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 5088 return 0; 5089 errout: 5090 WARN_ON(err == -EMSGSIZE); 5091 kfree_skb(skb); 5092 if (err) 5093 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 5094 return err; 5095 } 5096 5097 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 5098 struct netlink_ext_ack *extack) 5099 { 5100 struct net *net = sock_net(skb->sk); 5101 struct ifinfomsg *ifm; 5102 struct net_device *dev; 5103 struct nlattr *br_spec, *attr = NULL; 5104 int rem, err = -EOPNOTSUPP; 5105 u16 flags = 0; 5106 bool have_flags = false; 5107 5108 if (nlmsg_len(nlh) < sizeof(*ifm)) 5109 return -EINVAL; 5110 5111 ifm = nlmsg_data(nlh); 5112 if (ifm->ifi_family != AF_BRIDGE) 5113 return -EPFNOSUPPORT; 5114 5115 dev = __dev_get_by_index(net, ifm->ifi_index); 5116 if (!dev) { 5117 NL_SET_ERR_MSG(extack, "unknown ifindex"); 5118 return -ENODEV; 5119 } 5120 5121 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 5122 if (br_spec) { 5123 nla_for_each_nested(attr, br_spec, rem) { 5124 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 5125 if (nla_len(attr) < sizeof(flags)) 5126 return -EINVAL; 5127 5128 have_flags = true; 5129 flags = nla_get_u16(attr); 5130 break; 5131 } 5132 } 5133 } 5134 5135 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 5136 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 5137 5138 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 5139 err = -EOPNOTSUPP; 5140 goto out; 5141 } 5142 5143 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags, 5144 extack); 5145 if (err) 5146 goto out; 5147 5148 flags &= ~BRIDGE_FLAGS_MASTER; 5149 } 5150 5151 if ((flags & BRIDGE_FLAGS_SELF)) { 5152 if (!dev->netdev_ops->ndo_bridge_setlink) 5153 err = -EOPNOTSUPP; 5154 else 5155 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 5156 flags, 5157 extack); 5158 if (!err) { 5159 flags &= ~BRIDGE_FLAGS_SELF; 5160 5161 /* Generate event to notify upper layer of bridge 5162 * change 5163 */ 5164 err = rtnl_bridge_notify(dev); 5165 } 5166 } 5167 5168 if (have_flags) 5169 memcpy(nla_data(attr), &flags, sizeof(flags)); 5170 out: 5171 return err; 5172 } 5173 5174 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 5175 struct netlink_ext_ack *extack) 5176 { 5177 struct net *net = sock_net(skb->sk); 5178 struct ifinfomsg *ifm; 5179 struct net_device *dev; 5180 struct nlattr *br_spec, *attr = NULL; 5181 int rem, err = -EOPNOTSUPP; 5182 u16 flags = 0; 5183 bool have_flags = false; 5184 5185 if (nlmsg_len(nlh) < sizeof(*ifm)) 5186 return -EINVAL; 5187 5188 ifm = nlmsg_data(nlh); 5189 if (ifm->ifi_family != AF_BRIDGE) 5190 return -EPFNOSUPPORT; 5191 5192 dev = __dev_get_by_index(net, ifm->ifi_index); 5193 if (!dev) { 5194 NL_SET_ERR_MSG(extack, "unknown ifindex"); 5195 return -ENODEV; 5196 } 5197 5198 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 5199 if (br_spec) { 5200 nla_for_each_nested(attr, br_spec, rem) { 5201 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 5202 if (nla_len(attr) < sizeof(flags)) 5203 return -EINVAL; 5204 5205 have_flags = true; 5206 flags = nla_get_u16(attr); 5207 break; 5208 } 5209 } 5210 } 5211 5212 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 5213 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 5214 5215 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 5216 err = -EOPNOTSUPP; 5217 goto out; 5218 } 5219 5220 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 5221 if (err) 5222 goto out; 5223 5224 flags &= ~BRIDGE_FLAGS_MASTER; 5225 } 5226 5227 if ((flags & BRIDGE_FLAGS_SELF)) { 5228 if (!dev->netdev_ops->ndo_bridge_dellink) 5229 err = -EOPNOTSUPP; 5230 else 5231 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 5232 flags); 5233 5234 if (!err) { 5235 flags &= ~BRIDGE_FLAGS_SELF; 5236 5237 /* Generate event to notify upper layer of bridge 5238 * change 5239 */ 5240 err = rtnl_bridge_notify(dev); 5241 } 5242 } 5243 5244 if (have_flags) 5245 memcpy(nla_data(attr), &flags, sizeof(flags)); 5246 out: 5247 return err; 5248 } 5249 5250 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr) 5251 { 5252 return (mask & IFLA_STATS_FILTER_BIT(attrid)) && 5253 (!idxattr || idxattr == attrid); 5254 } 5255 5256 static bool 5257 rtnl_offload_xstats_have_ndo(const struct net_device *dev, int attr_id) 5258 { 5259 return dev->netdev_ops && 5260 dev->netdev_ops->ndo_has_offload_stats && 5261 dev->netdev_ops->ndo_get_offload_stats && 5262 dev->netdev_ops->ndo_has_offload_stats(dev, attr_id); 5263 } 5264 5265 static unsigned int 5266 rtnl_offload_xstats_get_size_ndo(const struct net_device *dev, int attr_id) 5267 { 5268 return rtnl_offload_xstats_have_ndo(dev, attr_id) ? 5269 sizeof(struct rtnl_link_stats64) : 0; 5270 } 5271 5272 static int 5273 rtnl_offload_xstats_fill_ndo(struct net_device *dev, int attr_id, 5274 struct sk_buff *skb) 5275 { 5276 unsigned int size = rtnl_offload_xstats_get_size_ndo(dev, attr_id); 5277 struct nlattr *attr = NULL; 5278 void *attr_data; 5279 int err; 5280 5281 if (!size) 5282 return -ENODATA; 5283 5284 attr = nla_reserve_64bit(skb, attr_id, size, 5285 IFLA_OFFLOAD_XSTATS_UNSPEC); 5286 if (!attr) 5287 return -EMSGSIZE; 5288 5289 attr_data = nla_data(attr); 5290 memset(attr_data, 0, size); 5291 5292 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, attr_data); 5293 if (err) 5294 return err; 5295 5296 return 0; 5297 } 5298 5299 static unsigned int 5300 rtnl_offload_xstats_get_size_stats(const struct net_device *dev, 5301 enum netdev_offload_xstats_type type) 5302 { 5303 bool enabled = netdev_offload_xstats_enabled(dev, type); 5304 5305 return enabled ? sizeof(struct rtnl_hw_stats64) : 0; 5306 } 5307 5308 struct rtnl_offload_xstats_request_used { 5309 bool request; 5310 bool used; 5311 }; 5312 5313 static int 5314 rtnl_offload_xstats_get_stats(struct net_device *dev, 5315 enum netdev_offload_xstats_type type, 5316 struct rtnl_offload_xstats_request_used *ru, 5317 struct rtnl_hw_stats64 *stats, 5318 struct netlink_ext_ack *extack) 5319 { 5320 bool request; 5321 bool used; 5322 int err; 5323 5324 request = netdev_offload_xstats_enabled(dev, type); 5325 if (!request) { 5326 used = false; 5327 goto out; 5328 } 5329 5330 err = netdev_offload_xstats_get(dev, type, stats, &used, extack); 5331 if (err) 5332 return err; 5333 5334 out: 5335 if (ru) { 5336 ru->request = request; 5337 ru->used = used; 5338 } 5339 return 0; 5340 } 5341 5342 static int 5343 rtnl_offload_xstats_fill_hw_s_info_one(struct sk_buff *skb, int attr_id, 5344 struct rtnl_offload_xstats_request_used *ru) 5345 { 5346 struct nlattr *nest; 5347 5348 nest = nla_nest_start(skb, attr_id); 5349 if (!nest) 5350 return -EMSGSIZE; 5351 5352 if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST, ru->request)) 5353 goto nla_put_failure; 5354 5355 if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED, ru->used)) 5356 goto nla_put_failure; 5357 5358 nla_nest_end(skb, nest); 5359 return 0; 5360 5361 nla_put_failure: 5362 nla_nest_cancel(skb, nest); 5363 return -EMSGSIZE; 5364 } 5365 5366 static int 5367 rtnl_offload_xstats_fill_hw_s_info(struct sk_buff *skb, struct net_device *dev, 5368 struct netlink_ext_ack *extack) 5369 { 5370 enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3; 5371 struct rtnl_offload_xstats_request_used ru_l3; 5372 struct nlattr *nest; 5373 int err; 5374 5375 err = rtnl_offload_xstats_get_stats(dev, t_l3, &ru_l3, NULL, extack); 5376 if (err) 5377 return err; 5378 5379 nest = nla_nest_start(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO); 5380 if (!nest) 5381 return -EMSGSIZE; 5382 5383 if (rtnl_offload_xstats_fill_hw_s_info_one(skb, 5384 IFLA_OFFLOAD_XSTATS_L3_STATS, 5385 &ru_l3)) 5386 goto nla_put_failure; 5387 5388 nla_nest_end(skb, nest); 5389 return 0; 5390 5391 nla_put_failure: 5392 nla_nest_cancel(skb, nest); 5393 return -EMSGSIZE; 5394 } 5395 5396 static int rtnl_offload_xstats_fill(struct sk_buff *skb, struct net_device *dev, 5397 int *prividx, u32 off_filter_mask, 5398 struct netlink_ext_ack *extack) 5399 { 5400 enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3; 5401 int attr_id_hw_s_info = IFLA_OFFLOAD_XSTATS_HW_S_INFO; 5402 int attr_id_l3_stats = IFLA_OFFLOAD_XSTATS_L3_STATS; 5403 int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT; 5404 bool have_data = false; 5405 int err; 5406 5407 if (*prividx <= attr_id_cpu_hit && 5408 (off_filter_mask & 5409 IFLA_STATS_FILTER_BIT(attr_id_cpu_hit))) { 5410 err = rtnl_offload_xstats_fill_ndo(dev, attr_id_cpu_hit, skb); 5411 if (!err) { 5412 have_data = true; 5413 } else if (err != -ENODATA) { 5414 *prividx = attr_id_cpu_hit; 5415 return err; 5416 } 5417 } 5418 5419 if (*prividx <= attr_id_hw_s_info && 5420 (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_hw_s_info))) { 5421 *prividx = attr_id_hw_s_info; 5422 5423 err = rtnl_offload_xstats_fill_hw_s_info(skb, dev, extack); 5424 if (err) 5425 return err; 5426 5427 have_data = true; 5428 *prividx = 0; 5429 } 5430 5431 if (*prividx <= attr_id_l3_stats && 5432 (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_l3_stats))) { 5433 unsigned int size_l3; 5434 struct nlattr *attr; 5435 5436 *prividx = attr_id_l3_stats; 5437 5438 size_l3 = rtnl_offload_xstats_get_size_stats(dev, t_l3); 5439 if (!size_l3) 5440 goto skip_l3_stats; 5441 attr = nla_reserve_64bit(skb, attr_id_l3_stats, size_l3, 5442 IFLA_OFFLOAD_XSTATS_UNSPEC); 5443 if (!attr) 5444 return -EMSGSIZE; 5445 5446 err = rtnl_offload_xstats_get_stats(dev, t_l3, NULL, 5447 nla_data(attr), extack); 5448 if (err) 5449 return err; 5450 5451 have_data = true; 5452 skip_l3_stats: 5453 *prividx = 0; 5454 } 5455 5456 if (!have_data) 5457 return -ENODATA; 5458 5459 *prividx = 0; 5460 return 0; 5461 } 5462 5463 static unsigned int 5464 rtnl_offload_xstats_get_size_hw_s_info_one(const struct net_device *dev, 5465 enum netdev_offload_xstats_type type) 5466 { 5467 bool enabled = netdev_offload_xstats_enabled(dev, type); 5468 5469 return nla_total_size(0) + 5470 /* IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST */ 5471 nla_total_size(sizeof(u8)) + 5472 /* IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED */ 5473 (enabled ? nla_total_size(sizeof(u8)) : 0) + 5474 0; 5475 } 5476 5477 static unsigned int 5478 rtnl_offload_xstats_get_size_hw_s_info(const struct net_device *dev) 5479 { 5480 enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3; 5481 5482 return nla_total_size(0) + 5483 /* IFLA_OFFLOAD_XSTATS_L3_STATS */ 5484 rtnl_offload_xstats_get_size_hw_s_info_one(dev, t_l3) + 5485 0; 5486 } 5487 5488 static int rtnl_offload_xstats_get_size(const struct net_device *dev, 5489 u32 off_filter_mask) 5490 { 5491 enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3; 5492 int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT; 5493 int nla_size = 0; 5494 int size; 5495 5496 if (off_filter_mask & 5497 IFLA_STATS_FILTER_BIT(attr_id_cpu_hit)) { 5498 size = rtnl_offload_xstats_get_size_ndo(dev, attr_id_cpu_hit); 5499 nla_size += nla_total_size_64bit(size); 5500 } 5501 5502 if (off_filter_mask & 5503 IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO)) 5504 nla_size += rtnl_offload_xstats_get_size_hw_s_info(dev); 5505 5506 if (off_filter_mask & 5507 IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_L3_STATS)) { 5508 size = rtnl_offload_xstats_get_size_stats(dev, t_l3); 5509 nla_size += nla_total_size_64bit(size); 5510 } 5511 5512 if (nla_size != 0) 5513 nla_size += nla_total_size(0); 5514 5515 return nla_size; 5516 } 5517 5518 struct rtnl_stats_dump_filters { 5519 /* mask[0] filters outer attributes. Then individual nests have their 5520 * filtering mask at the index of the nested attribute. 5521 */ 5522 u32 mask[IFLA_STATS_MAX + 1]; 5523 }; 5524 5525 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, 5526 int type, u32 pid, u32 seq, u32 change, 5527 unsigned int flags, 5528 const struct rtnl_stats_dump_filters *filters, 5529 int *idxattr, int *prividx, 5530 struct netlink_ext_ack *extack) 5531 { 5532 unsigned int filter_mask = filters->mask[0]; 5533 struct if_stats_msg *ifsm; 5534 struct nlmsghdr *nlh; 5535 struct nlattr *attr; 5536 int s_prividx = *prividx; 5537 int err; 5538 5539 ASSERT_RTNL(); 5540 5541 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags); 5542 if (!nlh) 5543 return -EMSGSIZE; 5544 5545 ifsm = nlmsg_data(nlh); 5546 ifsm->family = PF_UNSPEC; 5547 ifsm->pad1 = 0; 5548 ifsm->pad2 = 0; 5549 ifsm->ifindex = dev->ifindex; 5550 ifsm->filter_mask = filter_mask; 5551 5552 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) { 5553 struct rtnl_link_stats64 *sp; 5554 5555 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64, 5556 sizeof(struct rtnl_link_stats64), 5557 IFLA_STATS_UNSPEC); 5558 if (!attr) { 5559 err = -EMSGSIZE; 5560 goto nla_put_failure; 5561 } 5562 5563 sp = nla_data(attr); 5564 dev_get_stats(dev, sp); 5565 } 5566 5567 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) { 5568 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 5569 5570 if (ops && ops->fill_linkxstats) { 5571 *idxattr = IFLA_STATS_LINK_XSTATS; 5572 attr = nla_nest_start_noflag(skb, 5573 IFLA_STATS_LINK_XSTATS); 5574 if (!attr) { 5575 err = -EMSGSIZE; 5576 goto nla_put_failure; 5577 } 5578 5579 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 5580 nla_nest_end(skb, attr); 5581 if (err) 5582 goto nla_put_failure; 5583 *idxattr = 0; 5584 } 5585 } 5586 5587 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 5588 *idxattr)) { 5589 const struct rtnl_link_ops *ops = NULL; 5590 const struct net_device *master; 5591 5592 master = netdev_master_upper_dev_get(dev); 5593 if (master) 5594 ops = master->rtnl_link_ops; 5595 if (ops && ops->fill_linkxstats) { 5596 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE; 5597 attr = nla_nest_start_noflag(skb, 5598 IFLA_STATS_LINK_XSTATS_SLAVE); 5599 if (!attr) { 5600 err = -EMSGSIZE; 5601 goto nla_put_failure; 5602 } 5603 5604 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 5605 nla_nest_end(skb, attr); 5606 if (err) 5607 goto nla_put_failure; 5608 *idxattr = 0; 5609 } 5610 } 5611 5612 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 5613 *idxattr)) { 5614 u32 off_filter_mask; 5615 5616 off_filter_mask = filters->mask[IFLA_STATS_LINK_OFFLOAD_XSTATS]; 5617 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS; 5618 attr = nla_nest_start_noflag(skb, 5619 IFLA_STATS_LINK_OFFLOAD_XSTATS); 5620 if (!attr) { 5621 err = -EMSGSIZE; 5622 goto nla_put_failure; 5623 } 5624 5625 err = rtnl_offload_xstats_fill(skb, dev, prividx, 5626 off_filter_mask, extack); 5627 if (err == -ENODATA) 5628 nla_nest_cancel(skb, attr); 5629 else 5630 nla_nest_end(skb, attr); 5631 5632 if (err && err != -ENODATA) 5633 goto nla_put_failure; 5634 *idxattr = 0; 5635 } 5636 5637 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) { 5638 struct rtnl_af_ops *af_ops; 5639 5640 *idxattr = IFLA_STATS_AF_SPEC; 5641 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC); 5642 if (!attr) { 5643 err = -EMSGSIZE; 5644 goto nla_put_failure; 5645 } 5646 5647 rcu_read_lock(); 5648 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 5649 if (af_ops->fill_stats_af) { 5650 struct nlattr *af; 5651 5652 af = nla_nest_start_noflag(skb, 5653 af_ops->family); 5654 if (!af) { 5655 rcu_read_unlock(); 5656 err = -EMSGSIZE; 5657 goto nla_put_failure; 5658 } 5659 err = af_ops->fill_stats_af(skb, dev); 5660 5661 if (err == -ENODATA) { 5662 nla_nest_cancel(skb, af); 5663 } else if (err < 0) { 5664 rcu_read_unlock(); 5665 goto nla_put_failure; 5666 } 5667 5668 nla_nest_end(skb, af); 5669 } 5670 } 5671 rcu_read_unlock(); 5672 5673 nla_nest_end(skb, attr); 5674 5675 *idxattr = 0; 5676 } 5677 5678 nlmsg_end(skb, nlh); 5679 5680 return 0; 5681 5682 nla_put_failure: 5683 /* not a multi message or no progress mean a real error */ 5684 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx) 5685 nlmsg_cancel(skb, nlh); 5686 else 5687 nlmsg_end(skb, nlh); 5688 5689 return err; 5690 } 5691 5692 static size_t if_nlmsg_stats_size(const struct net_device *dev, 5693 const struct rtnl_stats_dump_filters *filters) 5694 { 5695 size_t size = NLMSG_ALIGN(sizeof(struct if_stats_msg)); 5696 unsigned int filter_mask = filters->mask[0]; 5697 5698 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0)) 5699 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64)); 5700 5701 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) { 5702 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 5703 int attr = IFLA_STATS_LINK_XSTATS; 5704 5705 if (ops && ops->get_linkxstats_size) { 5706 size += nla_total_size(ops->get_linkxstats_size(dev, 5707 attr)); 5708 /* for IFLA_STATS_LINK_XSTATS */ 5709 size += nla_total_size(0); 5710 } 5711 } 5712 5713 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) { 5714 struct net_device *_dev = (struct net_device *)dev; 5715 const struct rtnl_link_ops *ops = NULL; 5716 const struct net_device *master; 5717 5718 /* netdev_master_upper_dev_get can't take const */ 5719 master = netdev_master_upper_dev_get(_dev); 5720 if (master) 5721 ops = master->rtnl_link_ops; 5722 if (ops && ops->get_linkxstats_size) { 5723 int attr = IFLA_STATS_LINK_XSTATS_SLAVE; 5724 5725 size += nla_total_size(ops->get_linkxstats_size(dev, 5726 attr)); 5727 /* for IFLA_STATS_LINK_XSTATS_SLAVE */ 5728 size += nla_total_size(0); 5729 } 5730 } 5731 5732 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) { 5733 u32 off_filter_mask; 5734 5735 off_filter_mask = filters->mask[IFLA_STATS_LINK_OFFLOAD_XSTATS]; 5736 size += rtnl_offload_xstats_get_size(dev, off_filter_mask); 5737 } 5738 5739 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) { 5740 struct rtnl_af_ops *af_ops; 5741 5742 /* for IFLA_STATS_AF_SPEC */ 5743 size += nla_total_size(0); 5744 5745 rcu_read_lock(); 5746 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 5747 if (af_ops->get_stats_af_size) { 5748 size += nla_total_size( 5749 af_ops->get_stats_af_size(dev)); 5750 5751 /* for AF_* */ 5752 size += nla_total_size(0); 5753 } 5754 } 5755 rcu_read_unlock(); 5756 } 5757 5758 return size; 5759 } 5760 5761 #define RTNL_STATS_OFFLOAD_XSTATS_VALID ((1 << __IFLA_OFFLOAD_XSTATS_MAX) - 1) 5762 5763 static const struct nla_policy 5764 rtnl_stats_get_policy_filters[IFLA_STATS_MAX + 1] = { 5765 [IFLA_STATS_LINK_OFFLOAD_XSTATS] = 5766 NLA_POLICY_MASK(NLA_U32, RTNL_STATS_OFFLOAD_XSTATS_VALID), 5767 }; 5768 5769 static const struct nla_policy 5770 rtnl_stats_get_policy[IFLA_STATS_GETSET_MAX + 1] = { 5771 [IFLA_STATS_GET_FILTERS] = 5772 NLA_POLICY_NESTED(rtnl_stats_get_policy_filters), 5773 }; 5774 5775 static const struct nla_policy 5776 ifla_stats_set_policy[IFLA_STATS_GETSET_MAX + 1] = { 5777 [IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS] = NLA_POLICY_MAX(NLA_U8, 1), 5778 }; 5779 5780 static int rtnl_stats_get_parse_filters(struct nlattr *ifla_filters, 5781 struct rtnl_stats_dump_filters *filters, 5782 struct netlink_ext_ack *extack) 5783 { 5784 struct nlattr *tb[IFLA_STATS_MAX + 1]; 5785 int err; 5786 int at; 5787 5788 err = nla_parse_nested(tb, IFLA_STATS_MAX, ifla_filters, 5789 rtnl_stats_get_policy_filters, extack); 5790 if (err < 0) 5791 return err; 5792 5793 for (at = 1; at <= IFLA_STATS_MAX; at++) { 5794 if (tb[at]) { 5795 if (!(filters->mask[0] & IFLA_STATS_FILTER_BIT(at))) { 5796 NL_SET_ERR_MSG(extack, "Filtered attribute not enabled in filter_mask"); 5797 return -EINVAL; 5798 } 5799 filters->mask[at] = nla_get_u32(tb[at]); 5800 } 5801 } 5802 5803 return 0; 5804 } 5805 5806 static int rtnl_stats_get_parse(const struct nlmsghdr *nlh, 5807 u32 filter_mask, 5808 struct rtnl_stats_dump_filters *filters, 5809 struct netlink_ext_ack *extack) 5810 { 5811 struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1]; 5812 int err; 5813 int i; 5814 5815 filters->mask[0] = filter_mask; 5816 for (i = 1; i < ARRAY_SIZE(filters->mask); i++) 5817 filters->mask[i] = -1U; 5818 5819 err = nlmsg_parse(nlh, sizeof(struct if_stats_msg), tb, 5820 IFLA_STATS_GETSET_MAX, rtnl_stats_get_policy, extack); 5821 if (err < 0) 5822 return err; 5823 5824 if (tb[IFLA_STATS_GET_FILTERS]) { 5825 err = rtnl_stats_get_parse_filters(tb[IFLA_STATS_GET_FILTERS], 5826 filters, extack); 5827 if (err) 5828 return err; 5829 } 5830 5831 return 0; 5832 } 5833 5834 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check, 5835 bool is_dump, struct netlink_ext_ack *extack) 5836 { 5837 struct if_stats_msg *ifsm; 5838 5839 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) { 5840 NL_SET_ERR_MSG(extack, "Invalid header for stats dump"); 5841 return -EINVAL; 5842 } 5843 5844 if (!strict_check) 5845 return 0; 5846 5847 ifsm = nlmsg_data(nlh); 5848 5849 /* only requests using strict checks can pass data to influence 5850 * the dump. The legacy exception is filter_mask. 5851 */ 5852 if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) { 5853 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request"); 5854 return -EINVAL; 5855 } 5856 if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) { 5857 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask"); 5858 return -EINVAL; 5859 } 5860 5861 return 0; 5862 } 5863 5864 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh, 5865 struct netlink_ext_ack *extack) 5866 { 5867 struct rtnl_stats_dump_filters filters; 5868 struct net *net = sock_net(skb->sk); 5869 struct net_device *dev = NULL; 5870 int idxattr = 0, prividx = 0; 5871 struct if_stats_msg *ifsm; 5872 struct sk_buff *nskb; 5873 int err; 5874 5875 err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb), 5876 false, extack); 5877 if (err) 5878 return err; 5879 5880 ifsm = nlmsg_data(nlh); 5881 if (ifsm->ifindex > 0) 5882 dev = __dev_get_by_index(net, ifsm->ifindex); 5883 else 5884 return -EINVAL; 5885 5886 if (!dev) 5887 return -ENODEV; 5888 5889 if (!ifsm->filter_mask) { 5890 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats get"); 5891 return -EINVAL; 5892 } 5893 5894 err = rtnl_stats_get_parse(nlh, ifsm->filter_mask, &filters, extack); 5895 if (err) 5896 return err; 5897 5898 nskb = nlmsg_new(if_nlmsg_stats_size(dev, &filters), GFP_KERNEL); 5899 if (!nskb) 5900 return -ENOBUFS; 5901 5902 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS, 5903 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 5904 0, &filters, &idxattr, &prividx, extack); 5905 if (err < 0) { 5906 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */ 5907 WARN_ON(err == -EMSGSIZE); 5908 kfree_skb(nskb); 5909 } else { 5910 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 5911 } 5912 5913 return err; 5914 } 5915 5916 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb) 5917 { 5918 struct netlink_ext_ack *extack = cb->extack; 5919 int h, s_h, err, s_idx, s_idxattr, s_prividx; 5920 struct rtnl_stats_dump_filters filters; 5921 struct net *net = sock_net(skb->sk); 5922 unsigned int flags = NLM_F_MULTI; 5923 struct if_stats_msg *ifsm; 5924 struct hlist_head *head; 5925 struct net_device *dev; 5926 int idx = 0; 5927 5928 s_h = cb->args[0]; 5929 s_idx = cb->args[1]; 5930 s_idxattr = cb->args[2]; 5931 s_prividx = cb->args[3]; 5932 5933 cb->seq = net->dev_base_seq; 5934 5935 err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack); 5936 if (err) 5937 return err; 5938 5939 ifsm = nlmsg_data(cb->nlh); 5940 if (!ifsm->filter_mask) { 5941 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump"); 5942 return -EINVAL; 5943 } 5944 5945 err = rtnl_stats_get_parse(cb->nlh, ifsm->filter_mask, &filters, 5946 extack); 5947 if (err) 5948 return err; 5949 5950 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5951 idx = 0; 5952 head = &net->dev_index_head[h]; 5953 hlist_for_each_entry(dev, head, index_hlist) { 5954 if (idx < s_idx) 5955 goto cont; 5956 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 5957 NETLINK_CB(cb->skb).portid, 5958 cb->nlh->nlmsg_seq, 0, 5959 flags, &filters, 5960 &s_idxattr, &s_prividx, 5961 extack); 5962 /* If we ran out of room on the first message, 5963 * we're in trouble 5964 */ 5965 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 5966 5967 if (err < 0) 5968 goto out; 5969 s_prividx = 0; 5970 s_idxattr = 0; 5971 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5972 cont: 5973 idx++; 5974 } 5975 } 5976 out: 5977 cb->args[3] = s_prividx; 5978 cb->args[2] = s_idxattr; 5979 cb->args[1] = idx; 5980 cb->args[0] = h; 5981 5982 return skb->len; 5983 } 5984 5985 void rtnl_offload_xstats_notify(struct net_device *dev) 5986 { 5987 struct rtnl_stats_dump_filters response_filters = {}; 5988 struct net *net = dev_net(dev); 5989 int idxattr = 0, prividx = 0; 5990 struct sk_buff *skb; 5991 int err = -ENOBUFS; 5992 5993 ASSERT_RTNL(); 5994 5995 response_filters.mask[0] |= 5996 IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_OFFLOAD_XSTATS); 5997 response_filters.mask[IFLA_STATS_LINK_OFFLOAD_XSTATS] |= 5998 IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO); 5999 6000 skb = nlmsg_new(if_nlmsg_stats_size(dev, &response_filters), 6001 GFP_KERNEL); 6002 if (!skb) 6003 goto errout; 6004 6005 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 0, 0, 0, 0, 6006 &response_filters, &idxattr, &prividx, NULL); 6007 if (err < 0) { 6008 kfree_skb(skb); 6009 goto errout; 6010 } 6011 6012 rtnl_notify(skb, net, 0, RTNLGRP_STATS, NULL, GFP_KERNEL); 6013 return; 6014 6015 errout: 6016 rtnl_set_sk_err(net, RTNLGRP_STATS, err); 6017 } 6018 EXPORT_SYMBOL(rtnl_offload_xstats_notify); 6019 6020 static int rtnl_stats_set(struct sk_buff *skb, struct nlmsghdr *nlh, 6021 struct netlink_ext_ack *extack) 6022 { 6023 enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3; 6024 struct rtnl_stats_dump_filters response_filters = {}; 6025 struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1]; 6026 struct net *net = sock_net(skb->sk); 6027 struct net_device *dev = NULL; 6028 struct if_stats_msg *ifsm; 6029 bool notify = false; 6030 int err; 6031 6032 err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb), 6033 false, extack); 6034 if (err) 6035 return err; 6036 6037 ifsm = nlmsg_data(nlh); 6038 if (ifsm->family != AF_UNSPEC) { 6039 NL_SET_ERR_MSG(extack, "Address family should be AF_UNSPEC"); 6040 return -EINVAL; 6041 } 6042 6043 if (ifsm->ifindex > 0) 6044 dev = __dev_get_by_index(net, ifsm->ifindex); 6045 else 6046 return -EINVAL; 6047 6048 if (!dev) 6049 return -ENODEV; 6050 6051 if (ifsm->filter_mask) { 6052 NL_SET_ERR_MSG(extack, "Filter mask must be 0 for stats set"); 6053 return -EINVAL; 6054 } 6055 6056 err = nlmsg_parse(nlh, sizeof(*ifsm), tb, IFLA_STATS_GETSET_MAX, 6057 ifla_stats_set_policy, extack); 6058 if (err < 0) 6059 return err; 6060 6061 if (tb[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS]) { 6062 u8 req = nla_get_u8(tb[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS]); 6063 6064 if (req) 6065 err = netdev_offload_xstats_enable(dev, t_l3, extack); 6066 else 6067 err = netdev_offload_xstats_disable(dev, t_l3); 6068 6069 if (!err) 6070 notify = true; 6071 else if (err != -EALREADY) 6072 return err; 6073 6074 response_filters.mask[0] |= 6075 IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_OFFLOAD_XSTATS); 6076 response_filters.mask[IFLA_STATS_LINK_OFFLOAD_XSTATS] |= 6077 IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO); 6078 } 6079 6080 if (notify) 6081 rtnl_offload_xstats_notify(dev); 6082 6083 return 0; 6084 } 6085 6086 static int rtnl_mdb_valid_dump_req(const struct nlmsghdr *nlh, 6087 struct netlink_ext_ack *extack) 6088 { 6089 struct br_port_msg *bpm; 6090 6091 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) { 6092 NL_SET_ERR_MSG(extack, "Invalid header for mdb dump request"); 6093 return -EINVAL; 6094 } 6095 6096 bpm = nlmsg_data(nlh); 6097 if (bpm->ifindex) { 6098 NL_SET_ERR_MSG(extack, "Filtering by device index is not supported for mdb dump request"); 6099 return -EINVAL; 6100 } 6101 if (nlmsg_attrlen(nlh, sizeof(*bpm))) { 6102 NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request"); 6103 return -EINVAL; 6104 } 6105 6106 return 0; 6107 } 6108 6109 struct rtnl_mdb_dump_ctx { 6110 long idx; 6111 }; 6112 6113 static int rtnl_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 6114 { 6115 struct rtnl_mdb_dump_ctx *ctx = (void *)cb->ctx; 6116 struct net *net = sock_net(skb->sk); 6117 struct net_device *dev; 6118 int idx, s_idx; 6119 int err; 6120 6121 NL_ASSERT_DUMP_CTX_FITS(struct rtnl_mdb_dump_ctx); 6122 6123 if (cb->strict_check) { 6124 err = rtnl_mdb_valid_dump_req(cb->nlh, cb->extack); 6125 if (err) 6126 return err; 6127 } 6128 6129 s_idx = ctx->idx; 6130 idx = 0; 6131 6132 for_each_netdev(net, dev) { 6133 if (idx < s_idx) 6134 goto skip; 6135 if (!dev->netdev_ops->ndo_mdb_dump) 6136 goto skip; 6137 6138 err = dev->netdev_ops->ndo_mdb_dump(dev, skb, cb); 6139 if (err == -EMSGSIZE) 6140 goto out; 6141 /* Moving on to next device, reset markers and sequence 6142 * counters since they are all maintained per-device. 6143 */ 6144 memset(cb->ctx, 0, sizeof(cb->ctx)); 6145 cb->prev_seq = 0; 6146 cb->seq = 0; 6147 skip: 6148 idx++; 6149 } 6150 6151 out: 6152 ctx->idx = idx; 6153 return skb->len; 6154 } 6155 6156 static int rtnl_validate_mdb_entry(const struct nlattr *attr, 6157 struct netlink_ext_ack *extack) 6158 { 6159 struct br_mdb_entry *entry = nla_data(attr); 6160 6161 if (nla_len(attr) != sizeof(struct br_mdb_entry)) { 6162 NL_SET_ERR_MSG_ATTR(extack, attr, "Invalid attribute length"); 6163 return -EINVAL; 6164 } 6165 6166 if (entry->ifindex == 0) { 6167 NL_SET_ERR_MSG(extack, "Zero entry ifindex is not allowed"); 6168 return -EINVAL; 6169 } 6170 6171 if (entry->addr.proto == htons(ETH_P_IP)) { 6172 if (!ipv4_is_multicast(entry->addr.u.ip4) && 6173 !ipv4_is_zeronet(entry->addr.u.ip4)) { 6174 NL_SET_ERR_MSG(extack, "IPv4 entry group address is not multicast or 0.0.0.0"); 6175 return -EINVAL; 6176 } 6177 if (ipv4_is_local_multicast(entry->addr.u.ip4)) { 6178 NL_SET_ERR_MSG(extack, "IPv4 entry group address is local multicast"); 6179 return -EINVAL; 6180 } 6181 #if IS_ENABLED(CONFIG_IPV6) 6182 } else if (entry->addr.proto == htons(ETH_P_IPV6)) { 6183 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) { 6184 NL_SET_ERR_MSG(extack, "IPv6 entry group address is link-local all nodes"); 6185 return -EINVAL; 6186 } 6187 #endif 6188 } else if (entry->addr.proto == 0) { 6189 /* L2 mdb */ 6190 if (!is_multicast_ether_addr(entry->addr.u.mac_addr)) { 6191 NL_SET_ERR_MSG(extack, "L2 entry group is not multicast"); 6192 return -EINVAL; 6193 } 6194 } else { 6195 NL_SET_ERR_MSG(extack, "Unknown entry protocol"); 6196 return -EINVAL; 6197 } 6198 6199 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) { 6200 NL_SET_ERR_MSG(extack, "Unknown entry state"); 6201 return -EINVAL; 6202 } 6203 if (entry->vid >= VLAN_VID_MASK) { 6204 NL_SET_ERR_MSG(extack, "Invalid entry VLAN id"); 6205 return -EINVAL; 6206 } 6207 6208 return 0; 6209 } 6210 6211 static const struct nla_policy mdba_policy[MDBA_SET_ENTRY_MAX + 1] = { 6212 [MDBA_SET_ENTRY_UNSPEC] = { .strict_start_type = MDBA_SET_ENTRY_ATTRS + 1 }, 6213 [MDBA_SET_ENTRY] = NLA_POLICY_VALIDATE_FN(NLA_BINARY, 6214 rtnl_validate_mdb_entry, 6215 sizeof(struct br_mdb_entry)), 6216 [MDBA_SET_ENTRY_ATTRS] = { .type = NLA_NESTED }, 6217 }; 6218 6219 static int rtnl_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, 6220 struct netlink_ext_ack *extack) 6221 { 6222 struct nlattr *tb[MDBA_SET_ENTRY_MAX + 1]; 6223 struct net *net = sock_net(skb->sk); 6224 struct br_port_msg *bpm; 6225 struct net_device *dev; 6226 int err; 6227 6228 err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb, 6229 MDBA_SET_ENTRY_MAX, mdba_policy, extack); 6230 if (err) 6231 return err; 6232 6233 bpm = nlmsg_data(nlh); 6234 if (!bpm->ifindex) { 6235 NL_SET_ERR_MSG(extack, "Invalid ifindex"); 6236 return -EINVAL; 6237 } 6238 6239 dev = __dev_get_by_index(net, bpm->ifindex); 6240 if (!dev) { 6241 NL_SET_ERR_MSG(extack, "Device doesn't exist"); 6242 return -ENODEV; 6243 } 6244 6245 if (NL_REQ_ATTR_CHECK(extack, NULL, tb, MDBA_SET_ENTRY)) { 6246 NL_SET_ERR_MSG(extack, "Missing MDBA_SET_ENTRY attribute"); 6247 return -EINVAL; 6248 } 6249 6250 if (!dev->netdev_ops->ndo_mdb_add) { 6251 NL_SET_ERR_MSG(extack, "Device does not support MDB operations"); 6252 return -EOPNOTSUPP; 6253 } 6254 6255 return dev->netdev_ops->ndo_mdb_add(dev, tb, nlh->nlmsg_flags, extack); 6256 } 6257 6258 static int rtnl_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, 6259 struct netlink_ext_ack *extack) 6260 { 6261 struct nlattr *tb[MDBA_SET_ENTRY_MAX + 1]; 6262 struct net *net = sock_net(skb->sk); 6263 struct br_port_msg *bpm; 6264 struct net_device *dev; 6265 int err; 6266 6267 err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb, 6268 MDBA_SET_ENTRY_MAX, mdba_policy, extack); 6269 if (err) 6270 return err; 6271 6272 bpm = nlmsg_data(nlh); 6273 if (!bpm->ifindex) { 6274 NL_SET_ERR_MSG(extack, "Invalid ifindex"); 6275 return -EINVAL; 6276 } 6277 6278 dev = __dev_get_by_index(net, bpm->ifindex); 6279 if (!dev) { 6280 NL_SET_ERR_MSG(extack, "Device doesn't exist"); 6281 return -ENODEV; 6282 } 6283 6284 if (NL_REQ_ATTR_CHECK(extack, NULL, tb, MDBA_SET_ENTRY)) { 6285 NL_SET_ERR_MSG(extack, "Missing MDBA_SET_ENTRY attribute"); 6286 return -EINVAL; 6287 } 6288 6289 if (!dev->netdev_ops->ndo_mdb_del) { 6290 NL_SET_ERR_MSG(extack, "Device does not support MDB operations"); 6291 return -EOPNOTSUPP; 6292 } 6293 6294 return dev->netdev_ops->ndo_mdb_del(dev, tb, extack); 6295 } 6296 6297 /* Process one rtnetlink message. */ 6298 6299 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 6300 struct netlink_ext_ack *extack) 6301 { 6302 struct net *net = sock_net(skb->sk); 6303 struct rtnl_link *link; 6304 enum rtnl_kinds kind; 6305 struct module *owner; 6306 int err = -EOPNOTSUPP; 6307 rtnl_doit_func doit; 6308 unsigned int flags; 6309 int family; 6310 int type; 6311 6312 type = nlh->nlmsg_type; 6313 if (type > RTM_MAX) 6314 return -EOPNOTSUPP; 6315 6316 type -= RTM_BASE; 6317 6318 /* All the messages must have at least 1 byte length */ 6319 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 6320 return 0; 6321 6322 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 6323 kind = rtnl_msgtype_kind(type); 6324 6325 if (kind != RTNL_KIND_GET && !netlink_net_capable(skb, CAP_NET_ADMIN)) 6326 return -EPERM; 6327 6328 rcu_read_lock(); 6329 if (kind == RTNL_KIND_GET && (nlh->nlmsg_flags & NLM_F_DUMP)) { 6330 struct sock *rtnl; 6331 rtnl_dumpit_func dumpit; 6332 u32 min_dump_alloc = 0; 6333 6334 link = rtnl_get_link(family, type); 6335 if (!link || !link->dumpit) { 6336 family = PF_UNSPEC; 6337 link = rtnl_get_link(family, type); 6338 if (!link || !link->dumpit) 6339 goto err_unlock; 6340 } 6341 owner = link->owner; 6342 dumpit = link->dumpit; 6343 6344 if (type == RTM_GETLINK - RTM_BASE) 6345 min_dump_alloc = rtnl_calcit(skb, nlh); 6346 6347 err = 0; 6348 /* need to do this before rcu_read_unlock() */ 6349 if (!try_module_get(owner)) 6350 err = -EPROTONOSUPPORT; 6351 6352 rcu_read_unlock(); 6353 6354 rtnl = net->rtnl; 6355 if (err == 0) { 6356 struct netlink_dump_control c = { 6357 .dump = dumpit, 6358 .min_dump_alloc = min_dump_alloc, 6359 .module = owner, 6360 }; 6361 err = netlink_dump_start(rtnl, skb, nlh, &c); 6362 /* netlink_dump_start() will keep a reference on 6363 * module if dump is still in progress. 6364 */ 6365 module_put(owner); 6366 } 6367 return err; 6368 } 6369 6370 link = rtnl_get_link(family, type); 6371 if (!link || !link->doit) { 6372 family = PF_UNSPEC; 6373 link = rtnl_get_link(PF_UNSPEC, type); 6374 if (!link || !link->doit) 6375 goto out_unlock; 6376 } 6377 6378 owner = link->owner; 6379 if (!try_module_get(owner)) { 6380 err = -EPROTONOSUPPORT; 6381 goto out_unlock; 6382 } 6383 6384 flags = link->flags; 6385 if (kind == RTNL_KIND_DEL && (nlh->nlmsg_flags & NLM_F_BULK) && 6386 !(flags & RTNL_FLAG_BULK_DEL_SUPPORTED)) { 6387 NL_SET_ERR_MSG(extack, "Bulk delete is not supported"); 6388 module_put(owner); 6389 goto err_unlock; 6390 } 6391 6392 if (flags & RTNL_FLAG_DOIT_UNLOCKED) { 6393 doit = link->doit; 6394 rcu_read_unlock(); 6395 if (doit) 6396 err = doit(skb, nlh, extack); 6397 module_put(owner); 6398 return err; 6399 } 6400 rcu_read_unlock(); 6401 6402 rtnl_lock(); 6403 link = rtnl_get_link(family, type); 6404 if (link && link->doit) 6405 err = link->doit(skb, nlh, extack); 6406 rtnl_unlock(); 6407 6408 module_put(owner); 6409 6410 return err; 6411 6412 out_unlock: 6413 rcu_read_unlock(); 6414 return err; 6415 6416 err_unlock: 6417 rcu_read_unlock(); 6418 return -EOPNOTSUPP; 6419 } 6420 6421 static void rtnetlink_rcv(struct sk_buff *skb) 6422 { 6423 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 6424 } 6425 6426 static int rtnetlink_bind(struct net *net, int group) 6427 { 6428 switch (group) { 6429 case RTNLGRP_IPV4_MROUTE_R: 6430 case RTNLGRP_IPV6_MROUTE_R: 6431 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 6432 return -EPERM; 6433 break; 6434 } 6435 return 0; 6436 } 6437 6438 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 6439 { 6440 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 6441 6442 switch (event) { 6443 case NETDEV_REBOOT: 6444 case NETDEV_CHANGEMTU: 6445 case NETDEV_CHANGEADDR: 6446 case NETDEV_CHANGENAME: 6447 case NETDEV_FEAT_CHANGE: 6448 case NETDEV_BONDING_FAILOVER: 6449 case NETDEV_POST_TYPE_CHANGE: 6450 case NETDEV_NOTIFY_PEERS: 6451 case NETDEV_CHANGEUPPER: 6452 case NETDEV_RESEND_IGMP: 6453 case NETDEV_CHANGEINFODATA: 6454 case NETDEV_CHANGELOWERSTATE: 6455 case NETDEV_CHANGE_TX_QUEUE_LEN: 6456 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event), 6457 GFP_KERNEL, NULL, 0, 0, NULL); 6458 break; 6459 default: 6460 break; 6461 } 6462 return NOTIFY_DONE; 6463 } 6464 6465 static struct notifier_block rtnetlink_dev_notifier = { 6466 .notifier_call = rtnetlink_event, 6467 }; 6468 6469 6470 static int __net_init rtnetlink_net_init(struct net *net) 6471 { 6472 struct sock *sk; 6473 struct netlink_kernel_cfg cfg = { 6474 .groups = RTNLGRP_MAX, 6475 .input = rtnetlink_rcv, 6476 .cb_mutex = &rtnl_mutex, 6477 .flags = NL_CFG_F_NONROOT_RECV, 6478 .bind = rtnetlink_bind, 6479 }; 6480 6481 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 6482 if (!sk) 6483 return -ENOMEM; 6484 net->rtnl = sk; 6485 return 0; 6486 } 6487 6488 static void __net_exit rtnetlink_net_exit(struct net *net) 6489 { 6490 netlink_kernel_release(net->rtnl); 6491 net->rtnl = NULL; 6492 } 6493 6494 static struct pernet_operations rtnetlink_net_ops = { 6495 .init = rtnetlink_net_init, 6496 .exit = rtnetlink_net_exit, 6497 }; 6498 6499 void __init rtnetlink_init(void) 6500 { 6501 if (register_pernet_subsys(&rtnetlink_net_ops)) 6502 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 6503 6504 register_netdevice_notifier(&rtnetlink_dev_notifier); 6505 6506 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 6507 rtnl_dump_ifinfo, 0); 6508 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0); 6509 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0); 6510 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0); 6511 6512 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0); 6513 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0); 6514 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0); 6515 6516 rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0); 6517 rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0); 6518 6519 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0); 6520 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 6521 RTNL_FLAG_BULK_DEL_SUPPORTED); 6522 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0); 6523 6524 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0); 6525 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0); 6526 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0); 6527 6528 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump, 6529 0); 6530 rtnl_register(PF_UNSPEC, RTM_SETSTATS, rtnl_stats_set, NULL, 0); 6531 6532 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, rtnl_mdb_dump, 0); 6533 rtnl_register(PF_BRIDGE, RTM_NEWMDB, rtnl_mdb_add, NULL, 0); 6534 rtnl_register(PF_BRIDGE, RTM_DELMDB, rtnl_mdb_del, NULL, 0); 6535 } 6536