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 arithmetics was wrong. 13 */ 14 15 #include <linux/bitops.h> 16 #include <linux/errno.h> 17 #include <linux/module.h> 18 #include <linux/types.h> 19 #include <linux/socket.h> 20 #include <linux/kernel.h> 21 #include <linux/timer.h> 22 #include <linux/string.h> 23 #include <linux/sockios.h> 24 #include <linux/net.h> 25 #include <linux/fcntl.h> 26 #include <linux/mm.h> 27 #include <linux/slab.h> 28 #include <linux/interrupt.h> 29 #include <linux/capability.h> 30 #include <linux/skbuff.h> 31 #include <linux/init.h> 32 #include <linux/security.h> 33 #include <linux/mutex.h> 34 #include <linux/if_addr.h> 35 #include <linux/if_bridge.h> 36 #include <linux/if_vlan.h> 37 #include <linux/pci.h> 38 #include <linux/etherdevice.h> 39 #include <linux/bpf.h> 40 41 #include <linux/uaccess.h> 42 43 #include <linux/inet.h> 44 #include <linux/netdevice.h> 45 #include <net/ip.h> 46 #include <net/protocol.h> 47 #include <net/arp.h> 48 #include <net/route.h> 49 #include <net/udp.h> 50 #include <net/tcp.h> 51 #include <net/sock.h> 52 #include <net/pkt_sched.h> 53 #include <net/fib_rules.h> 54 #include <net/rtnetlink.h> 55 #include <net/net_namespace.h> 56 57 #define RTNL_MAX_TYPE 50 58 #define RTNL_SLAVE_MAX_TYPE 40 59 60 struct rtnl_link { 61 rtnl_doit_func doit; 62 rtnl_dumpit_func dumpit; 63 struct module *owner; 64 unsigned int flags; 65 struct rcu_head rcu; 66 }; 67 68 static DEFINE_MUTEX(rtnl_mutex); 69 70 void rtnl_lock(void) 71 { 72 mutex_lock(&rtnl_mutex); 73 } 74 EXPORT_SYMBOL(rtnl_lock); 75 76 int rtnl_lock_killable(void) 77 { 78 return mutex_lock_killable(&rtnl_mutex); 79 } 80 EXPORT_SYMBOL(rtnl_lock_killable); 81 82 static struct sk_buff *defer_kfree_skb_list; 83 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail) 84 { 85 if (head && tail) { 86 tail->next = defer_kfree_skb_list; 87 defer_kfree_skb_list = head; 88 } 89 } 90 EXPORT_SYMBOL(rtnl_kfree_skbs); 91 92 void __rtnl_unlock(void) 93 { 94 struct sk_buff *head = defer_kfree_skb_list; 95 96 defer_kfree_skb_list = NULL; 97 98 mutex_unlock(&rtnl_mutex); 99 100 while (head) { 101 struct sk_buff *next = head->next; 102 103 kfree_skb(head); 104 cond_resched(); 105 head = next; 106 } 107 } 108 109 void rtnl_unlock(void) 110 { 111 /* This fellow will unlock it for us. */ 112 netdev_run_todo(); 113 } 114 EXPORT_SYMBOL(rtnl_unlock); 115 116 int rtnl_trylock(void) 117 { 118 return mutex_trylock(&rtnl_mutex); 119 } 120 EXPORT_SYMBOL(rtnl_trylock); 121 122 int rtnl_is_locked(void) 123 { 124 return mutex_is_locked(&rtnl_mutex); 125 } 126 EXPORT_SYMBOL(rtnl_is_locked); 127 128 bool refcount_dec_and_rtnl_lock(refcount_t *r) 129 { 130 return refcount_dec_and_mutex_lock(r, &rtnl_mutex); 131 } 132 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock); 133 134 #ifdef CONFIG_PROVE_LOCKING 135 bool lockdep_rtnl_is_held(void) 136 { 137 return lockdep_is_held(&rtnl_mutex); 138 } 139 EXPORT_SYMBOL(lockdep_rtnl_is_held); 140 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 141 142 static struct rtnl_link __rcu *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 143 144 static inline int rtm_msgindex(int msgtype) 145 { 146 int msgindex = msgtype - RTM_BASE; 147 148 /* 149 * msgindex < 0 implies someone tried to register a netlink 150 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 151 * the message type has not been added to linux/rtnetlink.h 152 */ 153 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 154 155 return msgindex; 156 } 157 158 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype) 159 { 160 struct rtnl_link __rcu **tab; 161 162 if (protocol >= ARRAY_SIZE(rtnl_msg_handlers)) 163 protocol = PF_UNSPEC; 164 165 tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]); 166 if (!tab) 167 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]); 168 169 return rcu_dereference_rtnl(tab[msgtype]); 170 } 171 172 static int rtnl_register_internal(struct module *owner, 173 int protocol, int msgtype, 174 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 175 unsigned int flags) 176 { 177 struct rtnl_link *link, *old; 178 struct rtnl_link __rcu **tab; 179 int msgindex; 180 int ret = -ENOBUFS; 181 182 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 183 msgindex = rtm_msgindex(msgtype); 184 185 rtnl_lock(); 186 tab = rtnl_dereference(rtnl_msg_handlers[protocol]); 187 if (tab == NULL) { 188 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL); 189 if (!tab) 190 goto unlock; 191 192 /* ensures we see the 0 stores */ 193 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab); 194 } 195 196 old = rtnl_dereference(tab[msgindex]); 197 if (old) { 198 link = kmemdup(old, sizeof(*old), GFP_KERNEL); 199 if (!link) 200 goto unlock; 201 } else { 202 link = kzalloc(sizeof(*link), GFP_KERNEL); 203 if (!link) 204 goto unlock; 205 } 206 207 WARN_ON(link->owner && link->owner != owner); 208 link->owner = owner; 209 210 WARN_ON(doit && link->doit && link->doit != doit); 211 if (doit) 212 link->doit = doit; 213 WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit); 214 if (dumpit) 215 link->dumpit = dumpit; 216 217 link->flags |= flags; 218 219 /* publish protocol:msgtype */ 220 rcu_assign_pointer(tab[msgindex], link); 221 ret = 0; 222 if (old) 223 kfree_rcu(old, rcu); 224 unlock: 225 rtnl_unlock(); 226 return ret; 227 } 228 229 /** 230 * rtnl_register_module - Register a rtnetlink message type 231 * 232 * @owner: module registering the hook (THIS_MODULE) 233 * @protocol: Protocol family or PF_UNSPEC 234 * @msgtype: rtnetlink message type 235 * @doit: Function pointer called for each request message 236 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 237 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions 238 * 239 * Like rtnl_register, but for use by removable modules. 240 */ 241 int rtnl_register_module(struct module *owner, 242 int protocol, int msgtype, 243 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 244 unsigned int flags) 245 { 246 return rtnl_register_internal(owner, protocol, msgtype, 247 doit, dumpit, flags); 248 } 249 EXPORT_SYMBOL_GPL(rtnl_register_module); 250 251 /** 252 * rtnl_register - Register a rtnetlink message type 253 * @protocol: Protocol family or PF_UNSPEC 254 * @msgtype: rtnetlink message type 255 * @doit: Function pointer called for each request message 256 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 257 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions 258 * 259 * Registers the specified function pointers (at least one of them has 260 * to be non-NULL) to be called whenever a request message for the 261 * specified protocol family and message type is received. 262 * 263 * The special protocol family PF_UNSPEC may be used to define fallback 264 * function pointers for the case when no entry for the specific protocol 265 * family exists. 266 */ 267 void rtnl_register(int protocol, int msgtype, 268 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 269 unsigned int flags) 270 { 271 int err; 272 273 err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit, 274 flags); 275 if (err) 276 pr_err("Unable to register rtnetlink message handler, " 277 "protocol = %d, message type = %d\n", protocol, msgtype); 278 } 279 280 /** 281 * rtnl_unregister - Unregister a rtnetlink message type 282 * @protocol: Protocol family or PF_UNSPEC 283 * @msgtype: rtnetlink message type 284 * 285 * Returns 0 on success or a negative error code. 286 */ 287 int rtnl_unregister(int protocol, int msgtype) 288 { 289 struct rtnl_link __rcu **tab; 290 struct rtnl_link *link; 291 int msgindex; 292 293 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 294 msgindex = rtm_msgindex(msgtype); 295 296 rtnl_lock(); 297 tab = rtnl_dereference(rtnl_msg_handlers[protocol]); 298 if (!tab) { 299 rtnl_unlock(); 300 return -ENOENT; 301 } 302 303 link = rtnl_dereference(tab[msgindex]); 304 rcu_assign_pointer(tab[msgindex], NULL); 305 rtnl_unlock(); 306 307 kfree_rcu(link, rcu); 308 309 return 0; 310 } 311 EXPORT_SYMBOL_GPL(rtnl_unregister); 312 313 /** 314 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 315 * @protocol : Protocol family or PF_UNSPEC 316 * 317 * Identical to calling rtnl_unregster() for all registered message types 318 * of a certain protocol family. 319 */ 320 void rtnl_unregister_all(int protocol) 321 { 322 struct rtnl_link __rcu **tab; 323 struct rtnl_link *link; 324 int msgindex; 325 326 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 327 328 rtnl_lock(); 329 tab = rtnl_dereference(rtnl_msg_handlers[protocol]); 330 if (!tab) { 331 rtnl_unlock(); 332 return; 333 } 334 RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL); 335 for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) { 336 link = rtnl_dereference(tab[msgindex]); 337 if (!link) 338 continue; 339 340 rcu_assign_pointer(tab[msgindex], NULL); 341 kfree_rcu(link, rcu); 342 } 343 rtnl_unlock(); 344 345 synchronize_net(); 346 347 kfree(tab); 348 } 349 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 350 351 static LIST_HEAD(link_ops); 352 353 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 354 { 355 const struct rtnl_link_ops *ops; 356 357 list_for_each_entry(ops, &link_ops, list) { 358 if (!strcmp(ops->kind, kind)) 359 return ops; 360 } 361 return NULL; 362 } 363 364 /** 365 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 366 * @ops: struct rtnl_link_ops * to register 367 * 368 * The caller must hold the rtnl_mutex. This function should be used 369 * by drivers that create devices during module initialization. It 370 * must be called before registering the devices. 371 * 372 * Returns 0 on success or a negative error code. 373 */ 374 int __rtnl_link_register(struct rtnl_link_ops *ops) 375 { 376 if (rtnl_link_ops_get(ops->kind)) 377 return -EEXIST; 378 379 /* The check for setup is here because if ops 380 * does not have that filled up, it is not possible 381 * to use the ops for creating device. So do not 382 * fill up dellink as well. That disables rtnl_dellink. 383 */ 384 if (ops->setup && !ops->dellink) 385 ops->dellink = unregister_netdevice_queue; 386 387 list_add_tail(&ops->list, &link_ops); 388 return 0; 389 } 390 EXPORT_SYMBOL_GPL(__rtnl_link_register); 391 392 /** 393 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 394 * @ops: struct rtnl_link_ops * to register 395 * 396 * Returns 0 on success or a negative error code. 397 */ 398 int rtnl_link_register(struct rtnl_link_ops *ops) 399 { 400 int err; 401 402 /* Sanity-check max sizes to avoid stack buffer overflow. */ 403 if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE || 404 ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)) 405 return -EINVAL; 406 407 rtnl_lock(); 408 err = __rtnl_link_register(ops); 409 rtnl_unlock(); 410 return err; 411 } 412 EXPORT_SYMBOL_GPL(rtnl_link_register); 413 414 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 415 { 416 struct net_device *dev; 417 LIST_HEAD(list_kill); 418 419 for_each_netdev(net, dev) { 420 if (dev->rtnl_link_ops == ops) 421 ops->dellink(dev, &list_kill); 422 } 423 unregister_netdevice_many(&list_kill); 424 } 425 426 /** 427 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 428 * @ops: struct rtnl_link_ops * to unregister 429 * 430 * The caller must hold the rtnl_mutex and guarantee net_namespace_list 431 * integrity (hold pernet_ops_rwsem for writing to close the race 432 * with setup_net() and cleanup_net()). 433 */ 434 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 435 { 436 struct net *net; 437 438 for_each_net(net) { 439 __rtnl_kill_links(net, ops); 440 } 441 list_del(&ops->list); 442 } 443 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 444 445 /* Return with the rtnl_lock held when there are no network 446 * devices unregistering in any network namespace. 447 */ 448 static void rtnl_lock_unregistering_all(void) 449 { 450 struct net *net; 451 bool unregistering; 452 DEFINE_WAIT_FUNC(wait, woken_wake_function); 453 454 add_wait_queue(&netdev_unregistering_wq, &wait); 455 for (;;) { 456 unregistering = false; 457 rtnl_lock(); 458 /* We held write locked pernet_ops_rwsem, and parallel 459 * setup_net() and cleanup_net() are not possible. 460 */ 461 for_each_net(net) { 462 if (net->dev_unreg_count > 0) { 463 unregistering = true; 464 break; 465 } 466 } 467 if (!unregistering) 468 break; 469 __rtnl_unlock(); 470 471 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 472 } 473 remove_wait_queue(&netdev_unregistering_wq, &wait); 474 } 475 476 /** 477 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 478 * @ops: struct rtnl_link_ops * to unregister 479 */ 480 void rtnl_link_unregister(struct rtnl_link_ops *ops) 481 { 482 /* Close the race with setup_net() and cleanup_net() */ 483 down_write(&pernet_ops_rwsem); 484 rtnl_lock_unregistering_all(); 485 __rtnl_link_unregister(ops); 486 rtnl_unlock(); 487 up_write(&pernet_ops_rwsem); 488 } 489 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 490 491 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 492 { 493 struct net_device *master_dev; 494 const struct rtnl_link_ops *ops; 495 size_t size = 0; 496 497 rcu_read_lock(); 498 499 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev); 500 if (!master_dev) 501 goto out; 502 503 ops = master_dev->rtnl_link_ops; 504 if (!ops || !ops->get_slave_size) 505 goto out; 506 /* IFLA_INFO_SLAVE_DATA + nested data */ 507 size = nla_total_size(sizeof(struct nlattr)) + 508 ops->get_slave_size(master_dev, dev); 509 510 out: 511 rcu_read_unlock(); 512 return size; 513 } 514 515 static size_t rtnl_link_get_size(const struct net_device *dev) 516 { 517 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 518 size_t size; 519 520 if (!ops) 521 return 0; 522 523 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 524 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 525 526 if (ops->get_size) 527 /* IFLA_INFO_DATA + nested data */ 528 size += nla_total_size(sizeof(struct nlattr)) + 529 ops->get_size(dev); 530 531 if (ops->get_xstats_size) 532 /* IFLA_INFO_XSTATS */ 533 size += nla_total_size(ops->get_xstats_size(dev)); 534 535 size += rtnl_link_get_slave_info_data_size(dev); 536 537 return size; 538 } 539 540 static LIST_HEAD(rtnl_af_ops); 541 542 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 543 { 544 const struct rtnl_af_ops *ops; 545 546 list_for_each_entry_rcu(ops, &rtnl_af_ops, list) { 547 if (ops->family == family) 548 return ops; 549 } 550 551 return NULL; 552 } 553 554 /** 555 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 556 * @ops: struct rtnl_af_ops * to register 557 * 558 * Returns 0 on success or a negative error code. 559 */ 560 void rtnl_af_register(struct rtnl_af_ops *ops) 561 { 562 rtnl_lock(); 563 list_add_tail_rcu(&ops->list, &rtnl_af_ops); 564 rtnl_unlock(); 565 } 566 EXPORT_SYMBOL_GPL(rtnl_af_register); 567 568 /** 569 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 570 * @ops: struct rtnl_af_ops * to unregister 571 */ 572 void rtnl_af_unregister(struct rtnl_af_ops *ops) 573 { 574 rtnl_lock(); 575 list_del_rcu(&ops->list); 576 rtnl_unlock(); 577 578 synchronize_rcu(); 579 } 580 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 581 582 static size_t rtnl_link_get_af_size(const struct net_device *dev, 583 u32 ext_filter_mask) 584 { 585 struct rtnl_af_ops *af_ops; 586 size_t size; 587 588 /* IFLA_AF_SPEC */ 589 size = nla_total_size(sizeof(struct nlattr)); 590 591 rcu_read_lock(); 592 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 593 if (af_ops->get_link_af_size) { 594 /* AF_* + nested data */ 595 size += nla_total_size(sizeof(struct nlattr)) + 596 af_ops->get_link_af_size(dev, ext_filter_mask); 597 } 598 } 599 rcu_read_unlock(); 600 601 return size; 602 } 603 604 static bool rtnl_have_link_slave_info(const struct net_device *dev) 605 { 606 struct net_device *master_dev; 607 bool ret = false; 608 609 rcu_read_lock(); 610 611 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev); 612 if (master_dev && master_dev->rtnl_link_ops) 613 ret = true; 614 rcu_read_unlock(); 615 return ret; 616 } 617 618 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 619 const struct net_device *dev) 620 { 621 struct net_device *master_dev; 622 const struct rtnl_link_ops *ops; 623 struct nlattr *slave_data; 624 int err; 625 626 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 627 if (!master_dev) 628 return 0; 629 ops = master_dev->rtnl_link_ops; 630 if (!ops) 631 return 0; 632 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 633 return -EMSGSIZE; 634 if (ops->fill_slave_info) { 635 slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA); 636 if (!slave_data) 637 return -EMSGSIZE; 638 err = ops->fill_slave_info(skb, master_dev, dev); 639 if (err < 0) 640 goto err_cancel_slave_data; 641 nla_nest_end(skb, slave_data); 642 } 643 return 0; 644 645 err_cancel_slave_data: 646 nla_nest_cancel(skb, slave_data); 647 return err; 648 } 649 650 static int rtnl_link_info_fill(struct sk_buff *skb, 651 const struct net_device *dev) 652 { 653 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 654 struct nlattr *data; 655 int err; 656 657 if (!ops) 658 return 0; 659 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 660 return -EMSGSIZE; 661 if (ops->fill_xstats) { 662 err = ops->fill_xstats(skb, dev); 663 if (err < 0) 664 return err; 665 } 666 if (ops->fill_info) { 667 data = nla_nest_start_noflag(skb, IFLA_INFO_DATA); 668 if (data == NULL) 669 return -EMSGSIZE; 670 err = ops->fill_info(skb, dev); 671 if (err < 0) 672 goto err_cancel_data; 673 nla_nest_end(skb, data); 674 } 675 return 0; 676 677 err_cancel_data: 678 nla_nest_cancel(skb, data); 679 return err; 680 } 681 682 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 683 { 684 struct nlattr *linkinfo; 685 int err = -EMSGSIZE; 686 687 linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO); 688 if (linkinfo == NULL) 689 goto out; 690 691 err = rtnl_link_info_fill(skb, dev); 692 if (err < 0) 693 goto err_cancel_link; 694 695 err = rtnl_link_slave_info_fill(skb, dev); 696 if (err < 0) 697 goto err_cancel_link; 698 699 nla_nest_end(skb, linkinfo); 700 return 0; 701 702 err_cancel_link: 703 nla_nest_cancel(skb, linkinfo); 704 out: 705 return err; 706 } 707 708 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 709 { 710 struct sock *rtnl = net->rtnl; 711 int err = 0; 712 713 NETLINK_CB(skb).dst_group = group; 714 if (echo) 715 refcount_inc(&skb->users); 716 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 717 if (echo) 718 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 719 return err; 720 } 721 722 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 723 { 724 struct sock *rtnl = net->rtnl; 725 726 return nlmsg_unicast(rtnl, skb, pid); 727 } 728 EXPORT_SYMBOL(rtnl_unicast); 729 730 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 731 struct nlmsghdr *nlh, gfp_t flags) 732 { 733 struct sock *rtnl = net->rtnl; 734 int report = 0; 735 736 if (nlh) 737 report = nlmsg_report(nlh); 738 739 nlmsg_notify(rtnl, skb, pid, group, report, flags); 740 } 741 EXPORT_SYMBOL(rtnl_notify); 742 743 void rtnl_set_sk_err(struct net *net, u32 group, int error) 744 { 745 struct sock *rtnl = net->rtnl; 746 747 netlink_set_err(rtnl, 0, group, error); 748 } 749 EXPORT_SYMBOL(rtnl_set_sk_err); 750 751 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 752 { 753 struct nlattr *mx; 754 int i, valid = 0; 755 756 /* nothing is dumped for dst_default_metrics, so just skip the loop */ 757 if (metrics == dst_default_metrics.metrics) 758 return 0; 759 760 mx = nla_nest_start_noflag(skb, RTA_METRICS); 761 if (mx == NULL) 762 return -ENOBUFS; 763 764 for (i = 0; i < RTAX_MAX; i++) { 765 if (metrics[i]) { 766 if (i == RTAX_CC_ALGO - 1) { 767 char tmp[TCP_CA_NAME_MAX], *name; 768 769 name = tcp_ca_get_name_by_key(metrics[i], tmp); 770 if (!name) 771 continue; 772 if (nla_put_string(skb, i + 1, name)) 773 goto nla_put_failure; 774 } else if (i == RTAX_FEATURES - 1) { 775 u32 user_features = metrics[i] & RTAX_FEATURE_MASK; 776 777 if (!user_features) 778 continue; 779 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); 780 if (nla_put_u32(skb, i + 1, user_features)) 781 goto nla_put_failure; 782 } else { 783 if (nla_put_u32(skb, i + 1, metrics[i])) 784 goto nla_put_failure; 785 } 786 valid++; 787 } 788 } 789 790 if (!valid) { 791 nla_nest_cancel(skb, mx); 792 return 0; 793 } 794 795 return nla_nest_end(skb, mx); 796 797 nla_put_failure: 798 nla_nest_cancel(skb, mx); 799 return -EMSGSIZE; 800 } 801 EXPORT_SYMBOL(rtnetlink_put_metrics); 802 803 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 804 long expires, u32 error) 805 { 806 struct rta_cacheinfo ci = { 807 .rta_error = error, 808 .rta_id = id, 809 }; 810 811 if (dst) { 812 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse); 813 ci.rta_used = dst->__use; 814 ci.rta_clntref = atomic_read(&dst->__refcnt); 815 } 816 if (expires) { 817 unsigned long clock; 818 819 clock = jiffies_to_clock_t(abs(expires)); 820 clock = min_t(unsigned long, clock, INT_MAX); 821 ci.rta_expires = (expires > 0) ? clock : -clock; 822 } 823 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 824 } 825 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 826 827 static void set_operstate(struct net_device *dev, unsigned char transition) 828 { 829 unsigned char operstate = dev->operstate; 830 831 switch (transition) { 832 case IF_OPER_UP: 833 if ((operstate == IF_OPER_DORMANT || 834 operstate == IF_OPER_TESTING || 835 operstate == IF_OPER_UNKNOWN) && 836 !netif_dormant(dev) && !netif_testing(dev)) 837 operstate = IF_OPER_UP; 838 break; 839 840 case IF_OPER_TESTING: 841 if (operstate == IF_OPER_UP || 842 operstate == IF_OPER_UNKNOWN) 843 operstate = IF_OPER_TESTING; 844 break; 845 846 case IF_OPER_DORMANT: 847 if (operstate == IF_OPER_UP || 848 operstate == IF_OPER_UNKNOWN) 849 operstate = IF_OPER_DORMANT; 850 break; 851 } 852 853 if (dev->operstate != operstate) { 854 write_lock_bh(&dev_base_lock); 855 dev->operstate = operstate; 856 write_unlock_bh(&dev_base_lock); 857 netdev_state_change(dev); 858 } 859 } 860 861 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 862 { 863 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 864 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 865 } 866 867 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 868 const struct ifinfomsg *ifm) 869 { 870 unsigned int flags = ifm->ifi_flags; 871 872 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 873 if (ifm->ifi_change) 874 flags = (flags & ifm->ifi_change) | 875 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 876 877 return flags; 878 } 879 880 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 881 const struct rtnl_link_stats64 *b) 882 { 883 a->rx_packets = b->rx_packets; 884 a->tx_packets = b->tx_packets; 885 a->rx_bytes = b->rx_bytes; 886 a->tx_bytes = b->tx_bytes; 887 a->rx_errors = b->rx_errors; 888 a->tx_errors = b->tx_errors; 889 a->rx_dropped = b->rx_dropped; 890 a->tx_dropped = b->tx_dropped; 891 892 a->multicast = b->multicast; 893 a->collisions = b->collisions; 894 895 a->rx_length_errors = b->rx_length_errors; 896 a->rx_over_errors = b->rx_over_errors; 897 a->rx_crc_errors = b->rx_crc_errors; 898 a->rx_frame_errors = b->rx_frame_errors; 899 a->rx_fifo_errors = b->rx_fifo_errors; 900 a->rx_missed_errors = b->rx_missed_errors; 901 902 a->tx_aborted_errors = b->tx_aborted_errors; 903 a->tx_carrier_errors = b->tx_carrier_errors; 904 a->tx_fifo_errors = b->tx_fifo_errors; 905 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 906 a->tx_window_errors = b->tx_window_errors; 907 908 a->rx_compressed = b->rx_compressed; 909 a->tx_compressed = b->tx_compressed; 910 911 a->rx_nohandler = b->rx_nohandler; 912 } 913 914 /* All VF info */ 915 static inline int rtnl_vfinfo_size(const struct net_device *dev, 916 u32 ext_filter_mask) 917 { 918 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) { 919 int num_vfs = dev_num_vf(dev->dev.parent); 920 size_t size = nla_total_size(0); 921 size += num_vfs * 922 (nla_total_size(0) + 923 nla_total_size(sizeof(struct ifla_vf_mac)) + 924 nla_total_size(sizeof(struct ifla_vf_broadcast)) + 925 nla_total_size(sizeof(struct ifla_vf_vlan)) + 926 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */ 927 nla_total_size(MAX_VLAN_LIST_LEN * 928 sizeof(struct ifla_vf_vlan_info)) + 929 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 930 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 931 nla_total_size(sizeof(struct ifla_vf_rate)) + 932 nla_total_size(sizeof(struct ifla_vf_link_state)) + 933 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 934 nla_total_size(0) + /* nest IFLA_VF_STATS */ 935 /* IFLA_VF_STATS_RX_PACKETS */ 936 nla_total_size_64bit(sizeof(__u64)) + 937 /* IFLA_VF_STATS_TX_PACKETS */ 938 nla_total_size_64bit(sizeof(__u64)) + 939 /* IFLA_VF_STATS_RX_BYTES */ 940 nla_total_size_64bit(sizeof(__u64)) + 941 /* IFLA_VF_STATS_TX_BYTES */ 942 nla_total_size_64bit(sizeof(__u64)) + 943 /* IFLA_VF_STATS_BROADCAST */ 944 nla_total_size_64bit(sizeof(__u64)) + 945 /* IFLA_VF_STATS_MULTICAST */ 946 nla_total_size_64bit(sizeof(__u64)) + 947 /* IFLA_VF_STATS_RX_DROPPED */ 948 nla_total_size_64bit(sizeof(__u64)) + 949 /* IFLA_VF_STATS_TX_DROPPED */ 950 nla_total_size_64bit(sizeof(__u64)) + 951 nla_total_size(sizeof(struct ifla_vf_trust))); 952 return size; 953 } else 954 return 0; 955 } 956 957 static size_t rtnl_port_size(const struct net_device *dev, 958 u32 ext_filter_mask) 959 { 960 size_t port_size = nla_total_size(4) /* PORT_VF */ 961 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 962 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 963 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 964 + nla_total_size(1) /* PROT_VDP_REQUEST */ 965 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 966 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 967 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 968 + port_size; 969 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 970 + port_size; 971 972 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 973 !(ext_filter_mask & RTEXT_FILTER_VF)) 974 return 0; 975 if (dev_num_vf(dev->dev.parent)) 976 return port_self_size + vf_ports_size + 977 vf_port_size * dev_num_vf(dev->dev.parent); 978 else 979 return port_self_size; 980 } 981 982 static size_t rtnl_xdp_size(void) 983 { 984 size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */ 985 nla_total_size(1) + /* XDP_ATTACHED */ 986 nla_total_size(4) + /* XDP_PROG_ID (or 1st mode) */ 987 nla_total_size(4); /* XDP_<mode>_PROG_ID */ 988 989 return xdp_size; 990 } 991 992 static size_t rtnl_prop_list_size(const struct net_device *dev) 993 { 994 struct netdev_name_node *name_node; 995 size_t size; 996 997 if (list_empty(&dev->name_node->list)) 998 return 0; 999 size = nla_total_size(0); 1000 list_for_each_entry(name_node, &dev->name_node->list, list) 1001 size += nla_total_size(ALTIFNAMSIZ); 1002 return size; 1003 } 1004 1005 static size_t rtnl_proto_down_size(const struct net_device *dev) 1006 { 1007 size_t size = nla_total_size(1); 1008 1009 if (dev->proto_down_reason) 1010 size += nla_total_size(0) + nla_total_size(4); 1011 1012 return size; 1013 } 1014 1015 static noinline size_t if_nlmsg_size(const struct net_device *dev, 1016 u32 ext_filter_mask) 1017 { 1018 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 1019 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 1020 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 1021 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 1022 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap)) 1023 + nla_total_size(sizeof(struct rtnl_link_stats)) 1024 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64)) 1025 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 1026 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 1027 + nla_total_size(4) /* IFLA_TXQLEN */ 1028 + nla_total_size(4) /* IFLA_WEIGHT */ 1029 + nla_total_size(4) /* IFLA_MTU */ 1030 + nla_total_size(4) /* IFLA_LINK */ 1031 + nla_total_size(4) /* IFLA_MASTER */ 1032 + nla_total_size(1) /* IFLA_CARRIER */ 1033 + nla_total_size(4) /* IFLA_PROMISCUITY */ 1034 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 1035 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 1036 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */ 1037 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */ 1038 + nla_total_size(1) /* IFLA_OPERSTATE */ 1039 + nla_total_size(1) /* IFLA_LINKMODE */ 1040 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 1041 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 1042 + nla_total_size(4) /* IFLA_GROUP */ 1043 + nla_total_size(ext_filter_mask 1044 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 1045 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 1046 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 1047 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 1048 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 1049 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 1050 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 1051 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */ 1052 + rtnl_xdp_size() /* IFLA_XDP */ 1053 + nla_total_size(4) /* IFLA_EVENT */ 1054 + nla_total_size(4) /* IFLA_NEW_NETNSID */ 1055 + nla_total_size(4) /* IFLA_NEW_IFINDEX */ 1056 + rtnl_proto_down_size(dev) /* proto down */ 1057 + nla_total_size(4) /* IFLA_TARGET_NETNSID */ 1058 + nla_total_size(4) /* IFLA_CARRIER_UP_COUNT */ 1059 + nla_total_size(4) /* IFLA_CARRIER_DOWN_COUNT */ 1060 + nla_total_size(4) /* IFLA_MIN_MTU */ 1061 + nla_total_size(4) /* IFLA_MAX_MTU */ 1062 + rtnl_prop_list_size(dev) 1063 + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */ 1064 + 0; 1065 } 1066 1067 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 1068 { 1069 struct nlattr *vf_ports; 1070 struct nlattr *vf_port; 1071 int vf; 1072 int err; 1073 1074 vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS); 1075 if (!vf_ports) 1076 return -EMSGSIZE; 1077 1078 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 1079 vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT); 1080 if (!vf_port) 1081 goto nla_put_failure; 1082 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 1083 goto nla_put_failure; 1084 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 1085 if (err == -EMSGSIZE) 1086 goto nla_put_failure; 1087 if (err) { 1088 nla_nest_cancel(skb, vf_port); 1089 continue; 1090 } 1091 nla_nest_end(skb, vf_port); 1092 } 1093 1094 nla_nest_end(skb, vf_ports); 1095 1096 return 0; 1097 1098 nla_put_failure: 1099 nla_nest_cancel(skb, vf_ports); 1100 return -EMSGSIZE; 1101 } 1102 1103 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 1104 { 1105 struct nlattr *port_self; 1106 int err; 1107 1108 port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF); 1109 if (!port_self) 1110 return -EMSGSIZE; 1111 1112 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 1113 if (err) { 1114 nla_nest_cancel(skb, port_self); 1115 return (err == -EMSGSIZE) ? err : 0; 1116 } 1117 1118 nla_nest_end(skb, port_self); 1119 1120 return 0; 1121 } 1122 1123 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 1124 u32 ext_filter_mask) 1125 { 1126 int err; 1127 1128 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 1129 !(ext_filter_mask & RTEXT_FILTER_VF)) 1130 return 0; 1131 1132 err = rtnl_port_self_fill(skb, dev); 1133 if (err) 1134 return err; 1135 1136 if (dev_num_vf(dev->dev.parent)) { 1137 err = rtnl_vf_ports_fill(skb, dev); 1138 if (err) 1139 return err; 1140 } 1141 1142 return 0; 1143 } 1144 1145 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 1146 { 1147 int err; 1148 struct netdev_phys_item_id ppid; 1149 1150 err = dev_get_phys_port_id(dev, &ppid); 1151 if (err) { 1152 if (err == -EOPNOTSUPP) 1153 return 0; 1154 return err; 1155 } 1156 1157 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1158 return -EMSGSIZE; 1159 1160 return 0; 1161 } 1162 1163 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1164 { 1165 char name[IFNAMSIZ]; 1166 int err; 1167 1168 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1169 if (err) { 1170 if (err == -EOPNOTSUPP) 1171 return 0; 1172 return err; 1173 } 1174 1175 if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name)) 1176 return -EMSGSIZE; 1177 1178 return 0; 1179 } 1180 1181 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1182 { 1183 struct netdev_phys_item_id ppid = { }; 1184 int err; 1185 1186 err = dev_get_port_parent_id(dev, &ppid, false); 1187 if (err) { 1188 if (err == -EOPNOTSUPP) 1189 return 0; 1190 return err; 1191 } 1192 1193 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id)) 1194 return -EMSGSIZE; 1195 1196 return 0; 1197 } 1198 1199 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1200 struct net_device *dev) 1201 { 1202 struct rtnl_link_stats64 *sp; 1203 struct nlattr *attr; 1204 1205 attr = nla_reserve_64bit(skb, IFLA_STATS64, 1206 sizeof(struct rtnl_link_stats64), IFLA_PAD); 1207 if (!attr) 1208 return -EMSGSIZE; 1209 1210 sp = nla_data(attr); 1211 dev_get_stats(dev, sp); 1212 1213 attr = nla_reserve(skb, IFLA_STATS, 1214 sizeof(struct rtnl_link_stats)); 1215 if (!attr) 1216 return -EMSGSIZE; 1217 1218 copy_rtnl_link_stats(nla_data(attr), sp); 1219 1220 return 0; 1221 } 1222 1223 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1224 struct net_device *dev, 1225 int vfs_num, 1226 struct nlattr *vfinfo) 1227 { 1228 struct ifla_vf_rss_query_en vf_rss_query_en; 1229 struct nlattr *vf, *vfstats, *vfvlanlist; 1230 struct ifla_vf_link_state vf_linkstate; 1231 struct ifla_vf_vlan_info vf_vlan_info; 1232 struct ifla_vf_spoofchk vf_spoofchk; 1233 struct ifla_vf_tx_rate vf_tx_rate; 1234 struct ifla_vf_stats vf_stats; 1235 struct ifla_vf_trust vf_trust; 1236 struct ifla_vf_vlan vf_vlan; 1237 struct ifla_vf_rate vf_rate; 1238 struct ifla_vf_mac vf_mac; 1239 struct ifla_vf_broadcast vf_broadcast; 1240 struct ifla_vf_info ivi; 1241 struct ifla_vf_guid node_guid; 1242 struct ifla_vf_guid port_guid; 1243 1244 memset(&ivi, 0, sizeof(ivi)); 1245 1246 /* Not all SR-IOV capable drivers support the 1247 * spoofcheck and "RSS query enable" query. Preset to 1248 * -1 so the user space tool can detect that the driver 1249 * didn't report anything. 1250 */ 1251 ivi.spoofchk = -1; 1252 ivi.rss_query_en = -1; 1253 ivi.trusted = -1; 1254 /* The default value for VF link state is "auto" 1255 * IFLA_VF_LINK_STATE_AUTO which equals zero 1256 */ 1257 ivi.linkstate = 0; 1258 /* VLAN Protocol by default is 802.1Q */ 1259 ivi.vlan_proto = htons(ETH_P_8021Q); 1260 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1261 return 0; 1262 1263 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info)); 1264 memset(&node_guid, 0, sizeof(node_guid)); 1265 memset(&port_guid, 0, sizeof(port_guid)); 1266 1267 vf_mac.vf = 1268 vf_vlan.vf = 1269 vf_vlan_info.vf = 1270 vf_rate.vf = 1271 vf_tx_rate.vf = 1272 vf_spoofchk.vf = 1273 vf_linkstate.vf = 1274 vf_rss_query_en.vf = 1275 vf_trust.vf = 1276 node_guid.vf = 1277 port_guid.vf = ivi.vf; 1278 1279 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1280 memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len); 1281 vf_vlan.vlan = ivi.vlan; 1282 vf_vlan.qos = ivi.qos; 1283 vf_vlan_info.vlan = ivi.vlan; 1284 vf_vlan_info.qos = ivi.qos; 1285 vf_vlan_info.vlan_proto = ivi.vlan_proto; 1286 vf_tx_rate.rate = ivi.max_tx_rate; 1287 vf_rate.min_tx_rate = ivi.min_tx_rate; 1288 vf_rate.max_tx_rate = ivi.max_tx_rate; 1289 vf_spoofchk.setting = ivi.spoofchk; 1290 vf_linkstate.link_state = ivi.linkstate; 1291 vf_rss_query_en.setting = ivi.rss_query_en; 1292 vf_trust.setting = ivi.trusted; 1293 vf = nla_nest_start_noflag(skb, IFLA_VF_INFO); 1294 if (!vf) 1295 goto nla_put_vfinfo_failure; 1296 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1297 nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) || 1298 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1299 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1300 &vf_rate) || 1301 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1302 &vf_tx_rate) || 1303 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1304 &vf_spoofchk) || 1305 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1306 &vf_linkstate) || 1307 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1308 sizeof(vf_rss_query_en), 1309 &vf_rss_query_en) || 1310 nla_put(skb, IFLA_VF_TRUST, 1311 sizeof(vf_trust), &vf_trust)) 1312 goto nla_put_vf_failure; 1313 1314 if (dev->netdev_ops->ndo_get_vf_guid && 1315 !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid, 1316 &port_guid)) { 1317 if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid), 1318 &node_guid) || 1319 nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid), 1320 &port_guid)) 1321 goto nla_put_vf_failure; 1322 } 1323 vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST); 1324 if (!vfvlanlist) 1325 goto nla_put_vf_failure; 1326 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info), 1327 &vf_vlan_info)) { 1328 nla_nest_cancel(skb, vfvlanlist); 1329 goto nla_put_vf_failure; 1330 } 1331 nla_nest_end(skb, vfvlanlist); 1332 memset(&vf_stats, 0, sizeof(vf_stats)); 1333 if (dev->netdev_ops->ndo_get_vf_stats) 1334 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1335 &vf_stats); 1336 vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS); 1337 if (!vfstats) 1338 goto nla_put_vf_failure; 1339 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS, 1340 vf_stats.rx_packets, IFLA_VF_STATS_PAD) || 1341 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS, 1342 vf_stats.tx_packets, IFLA_VF_STATS_PAD) || 1343 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES, 1344 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) || 1345 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES, 1346 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) || 1347 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST, 1348 vf_stats.broadcast, IFLA_VF_STATS_PAD) || 1349 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST, 1350 vf_stats.multicast, IFLA_VF_STATS_PAD) || 1351 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED, 1352 vf_stats.rx_dropped, IFLA_VF_STATS_PAD) || 1353 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED, 1354 vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) { 1355 nla_nest_cancel(skb, vfstats); 1356 goto nla_put_vf_failure; 1357 } 1358 nla_nest_end(skb, vfstats); 1359 nla_nest_end(skb, vf); 1360 return 0; 1361 1362 nla_put_vf_failure: 1363 nla_nest_cancel(skb, vf); 1364 nla_put_vfinfo_failure: 1365 nla_nest_cancel(skb, vfinfo); 1366 return -EMSGSIZE; 1367 } 1368 1369 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb, 1370 struct net_device *dev, 1371 u32 ext_filter_mask) 1372 { 1373 struct nlattr *vfinfo; 1374 int i, num_vfs; 1375 1376 if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0)) 1377 return 0; 1378 1379 num_vfs = dev_num_vf(dev->dev.parent); 1380 if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs)) 1381 return -EMSGSIZE; 1382 1383 if (!dev->netdev_ops->ndo_get_vf_config) 1384 return 0; 1385 1386 vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST); 1387 if (!vfinfo) 1388 return -EMSGSIZE; 1389 1390 for (i = 0; i < num_vfs; i++) { 1391 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1392 return -EMSGSIZE; 1393 } 1394 1395 nla_nest_end(skb, vfinfo); 1396 return 0; 1397 } 1398 1399 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1400 { 1401 struct rtnl_link_ifmap map; 1402 1403 memset(&map, 0, sizeof(map)); 1404 map.mem_start = dev->mem_start; 1405 map.mem_end = dev->mem_end; 1406 map.base_addr = dev->base_addr; 1407 map.irq = dev->irq; 1408 map.dma = dev->dma; 1409 map.port = dev->if_port; 1410 1411 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD)) 1412 return -EMSGSIZE; 1413 1414 return 0; 1415 } 1416 1417 static u32 rtnl_xdp_prog_skb(struct net_device *dev) 1418 { 1419 const struct bpf_prog *generic_xdp_prog; 1420 1421 ASSERT_RTNL(); 1422 1423 generic_xdp_prog = rtnl_dereference(dev->xdp_prog); 1424 if (!generic_xdp_prog) 1425 return 0; 1426 return generic_xdp_prog->aux->id; 1427 } 1428 1429 static u32 rtnl_xdp_prog_drv(struct net_device *dev) 1430 { 1431 return dev_xdp_prog_id(dev, XDP_MODE_DRV); 1432 } 1433 1434 static u32 rtnl_xdp_prog_hw(struct net_device *dev) 1435 { 1436 return dev_xdp_prog_id(dev, XDP_MODE_HW); 1437 } 1438 1439 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev, 1440 u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr, 1441 u32 (*get_prog_id)(struct net_device *dev)) 1442 { 1443 u32 curr_id; 1444 int err; 1445 1446 curr_id = get_prog_id(dev); 1447 if (!curr_id) 1448 return 0; 1449 1450 *prog_id = curr_id; 1451 err = nla_put_u32(skb, attr, curr_id); 1452 if (err) 1453 return err; 1454 1455 if (*mode != XDP_ATTACHED_NONE) 1456 *mode = XDP_ATTACHED_MULTI; 1457 else 1458 *mode = tgt_mode; 1459 1460 return 0; 1461 } 1462 1463 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev) 1464 { 1465 struct nlattr *xdp; 1466 u32 prog_id; 1467 int err; 1468 u8 mode; 1469 1470 xdp = nla_nest_start_noflag(skb, IFLA_XDP); 1471 if (!xdp) 1472 return -EMSGSIZE; 1473 1474 prog_id = 0; 1475 mode = XDP_ATTACHED_NONE; 1476 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB, 1477 IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb); 1478 if (err) 1479 goto err_cancel; 1480 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV, 1481 IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv); 1482 if (err) 1483 goto err_cancel; 1484 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW, 1485 IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw); 1486 if (err) 1487 goto err_cancel; 1488 1489 err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode); 1490 if (err) 1491 goto err_cancel; 1492 1493 if (prog_id && mode != XDP_ATTACHED_MULTI) { 1494 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id); 1495 if (err) 1496 goto err_cancel; 1497 } 1498 1499 nla_nest_end(skb, xdp); 1500 return 0; 1501 1502 err_cancel: 1503 nla_nest_cancel(skb, xdp); 1504 return err; 1505 } 1506 1507 static u32 rtnl_get_event(unsigned long event) 1508 { 1509 u32 rtnl_event_type = IFLA_EVENT_NONE; 1510 1511 switch (event) { 1512 case NETDEV_REBOOT: 1513 rtnl_event_type = IFLA_EVENT_REBOOT; 1514 break; 1515 case NETDEV_FEAT_CHANGE: 1516 rtnl_event_type = IFLA_EVENT_FEATURES; 1517 break; 1518 case NETDEV_BONDING_FAILOVER: 1519 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER; 1520 break; 1521 case NETDEV_NOTIFY_PEERS: 1522 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS; 1523 break; 1524 case NETDEV_RESEND_IGMP: 1525 rtnl_event_type = IFLA_EVENT_IGMP_RESEND; 1526 break; 1527 case NETDEV_CHANGEINFODATA: 1528 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS; 1529 break; 1530 default: 1531 break; 1532 } 1533 1534 return rtnl_event_type; 1535 } 1536 1537 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev) 1538 { 1539 const struct net_device *upper_dev; 1540 int ret = 0; 1541 1542 rcu_read_lock(); 1543 1544 upper_dev = netdev_master_upper_dev_get_rcu(dev); 1545 if (upper_dev) 1546 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex); 1547 1548 rcu_read_unlock(); 1549 return ret; 1550 } 1551 1552 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev, 1553 bool force) 1554 { 1555 int ifindex = dev_get_iflink(dev); 1556 1557 if (force || dev->ifindex != ifindex) 1558 return nla_put_u32(skb, IFLA_LINK, ifindex); 1559 1560 return 0; 1561 } 1562 1563 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb, 1564 struct net_device *dev) 1565 { 1566 char buf[IFALIASZ]; 1567 int ret; 1568 1569 ret = dev_get_alias(dev, buf, sizeof(buf)); 1570 return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0; 1571 } 1572 1573 static int rtnl_fill_link_netnsid(struct sk_buff *skb, 1574 const struct net_device *dev, 1575 struct net *src_net, gfp_t gfp) 1576 { 1577 bool put_iflink = false; 1578 1579 if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) { 1580 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1581 1582 if (!net_eq(dev_net(dev), link_net)) { 1583 int id = peernet2id_alloc(src_net, link_net, gfp); 1584 1585 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1586 return -EMSGSIZE; 1587 1588 put_iflink = true; 1589 } 1590 } 1591 1592 return nla_put_iflink(skb, dev, put_iflink); 1593 } 1594 1595 static int rtnl_fill_link_af(struct sk_buff *skb, 1596 const struct net_device *dev, 1597 u32 ext_filter_mask) 1598 { 1599 const struct rtnl_af_ops *af_ops; 1600 struct nlattr *af_spec; 1601 1602 af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC); 1603 if (!af_spec) 1604 return -EMSGSIZE; 1605 1606 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 1607 struct nlattr *af; 1608 int err; 1609 1610 if (!af_ops->fill_link_af) 1611 continue; 1612 1613 af = nla_nest_start_noflag(skb, af_ops->family); 1614 if (!af) 1615 return -EMSGSIZE; 1616 1617 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1618 /* 1619 * Caller may return ENODATA to indicate that there 1620 * was no data to be dumped. This is not an error, it 1621 * means we should trim the attribute header and 1622 * continue. 1623 */ 1624 if (err == -ENODATA) 1625 nla_nest_cancel(skb, af); 1626 else if (err < 0) 1627 return -EMSGSIZE; 1628 1629 nla_nest_end(skb, af); 1630 } 1631 1632 nla_nest_end(skb, af_spec); 1633 return 0; 1634 } 1635 1636 static int rtnl_fill_alt_ifnames(struct sk_buff *skb, 1637 const struct net_device *dev) 1638 { 1639 struct netdev_name_node *name_node; 1640 int count = 0; 1641 1642 list_for_each_entry(name_node, &dev->name_node->list, list) { 1643 if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name)) 1644 return -EMSGSIZE; 1645 count++; 1646 } 1647 return count; 1648 } 1649 1650 static int rtnl_fill_prop_list(struct sk_buff *skb, 1651 const struct net_device *dev) 1652 { 1653 struct nlattr *prop_list; 1654 int ret; 1655 1656 prop_list = nla_nest_start(skb, IFLA_PROP_LIST); 1657 if (!prop_list) 1658 return -EMSGSIZE; 1659 1660 ret = rtnl_fill_alt_ifnames(skb, dev); 1661 if (ret <= 0) 1662 goto nest_cancel; 1663 1664 nla_nest_end(skb, prop_list); 1665 return 0; 1666 1667 nest_cancel: 1668 nla_nest_cancel(skb, prop_list); 1669 return ret; 1670 } 1671 1672 static int rtnl_fill_proto_down(struct sk_buff *skb, 1673 const struct net_device *dev) 1674 { 1675 struct nlattr *pr; 1676 u32 preason; 1677 1678 if (nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1679 goto nla_put_failure; 1680 1681 preason = dev->proto_down_reason; 1682 if (!preason) 1683 return 0; 1684 1685 pr = nla_nest_start(skb, IFLA_PROTO_DOWN_REASON); 1686 if (!pr) 1687 return -EMSGSIZE; 1688 1689 if (nla_put_u32(skb, IFLA_PROTO_DOWN_REASON_VALUE, preason)) { 1690 nla_nest_cancel(skb, pr); 1691 goto nla_put_failure; 1692 } 1693 1694 nla_nest_end(skb, pr); 1695 return 0; 1696 1697 nla_put_failure: 1698 return -EMSGSIZE; 1699 } 1700 1701 static int rtnl_fill_ifinfo(struct sk_buff *skb, 1702 struct net_device *dev, struct net *src_net, 1703 int type, u32 pid, u32 seq, u32 change, 1704 unsigned int flags, u32 ext_filter_mask, 1705 u32 event, int *new_nsid, int new_ifindex, 1706 int tgt_netnsid, gfp_t gfp) 1707 { 1708 struct ifinfomsg *ifm; 1709 struct nlmsghdr *nlh; 1710 1711 ASSERT_RTNL(); 1712 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1713 if (nlh == NULL) 1714 return -EMSGSIZE; 1715 1716 ifm = nlmsg_data(nlh); 1717 ifm->ifi_family = AF_UNSPEC; 1718 ifm->__ifi_pad = 0; 1719 ifm->ifi_type = dev->type; 1720 ifm->ifi_index = dev->ifindex; 1721 ifm->ifi_flags = dev_get_flags(dev); 1722 ifm->ifi_change = change; 1723 1724 if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid)) 1725 goto nla_put_failure; 1726 1727 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1728 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1729 nla_put_u8(skb, IFLA_OPERSTATE, 1730 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1731 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1732 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1733 nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) || 1734 nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) || 1735 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1736 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1737 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1738 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) || 1739 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) || 1740 #ifdef CONFIG_RPS 1741 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1742 #endif 1743 put_master_ifindex(skb, dev) || 1744 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1745 (dev->qdisc && 1746 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1747 nla_put_ifalias(skb, dev) || 1748 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1749 atomic_read(&dev->carrier_up_count) + 1750 atomic_read(&dev->carrier_down_count)) || 1751 nla_put_u32(skb, IFLA_CARRIER_UP_COUNT, 1752 atomic_read(&dev->carrier_up_count)) || 1753 nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT, 1754 atomic_read(&dev->carrier_down_count))) 1755 goto nla_put_failure; 1756 1757 if (rtnl_fill_proto_down(skb, dev)) 1758 goto nla_put_failure; 1759 1760 if (event != IFLA_EVENT_NONE) { 1761 if (nla_put_u32(skb, IFLA_EVENT, event)) 1762 goto nla_put_failure; 1763 } 1764 1765 if (rtnl_fill_link_ifmap(skb, dev)) 1766 goto nla_put_failure; 1767 1768 if (dev->addr_len) { 1769 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1770 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1771 goto nla_put_failure; 1772 } 1773 1774 if (rtnl_phys_port_id_fill(skb, dev)) 1775 goto nla_put_failure; 1776 1777 if (rtnl_phys_port_name_fill(skb, dev)) 1778 goto nla_put_failure; 1779 1780 if (rtnl_phys_switch_id_fill(skb, dev)) 1781 goto nla_put_failure; 1782 1783 if (rtnl_fill_stats(skb, dev)) 1784 goto nla_put_failure; 1785 1786 if (rtnl_fill_vf(skb, dev, ext_filter_mask)) 1787 goto nla_put_failure; 1788 1789 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1790 goto nla_put_failure; 1791 1792 if (rtnl_xdp_fill(skb, dev)) 1793 goto nla_put_failure; 1794 1795 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1796 if (rtnl_link_fill(skb, dev) < 0) 1797 goto nla_put_failure; 1798 } 1799 1800 if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp)) 1801 goto nla_put_failure; 1802 1803 if (new_nsid && 1804 nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0) 1805 goto nla_put_failure; 1806 if (new_ifindex && 1807 nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0) 1808 goto nla_put_failure; 1809 1810 if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) && 1811 nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr)) 1812 goto nla_put_failure; 1813 1814 rcu_read_lock(); 1815 if (rtnl_fill_link_af(skb, dev, ext_filter_mask)) 1816 goto nla_put_failure_rcu; 1817 rcu_read_unlock(); 1818 1819 if (rtnl_fill_prop_list(skb, dev)) 1820 goto nla_put_failure; 1821 1822 nlmsg_end(skb, nlh); 1823 return 0; 1824 1825 nla_put_failure_rcu: 1826 rcu_read_unlock(); 1827 nla_put_failure: 1828 nlmsg_cancel(skb, nlh); 1829 return -EMSGSIZE; 1830 } 1831 1832 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1833 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1834 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1835 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1836 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1837 [IFLA_MTU] = { .type = NLA_U32 }, 1838 [IFLA_LINK] = { .type = NLA_U32 }, 1839 [IFLA_MASTER] = { .type = NLA_U32 }, 1840 [IFLA_CARRIER] = { .type = NLA_U8 }, 1841 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1842 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1843 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1844 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1845 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1846 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1847 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1848 /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to 1849 * allow 0-length string (needed to remove an alias). 1850 */ 1851 [IFLA_IFALIAS] = { .type = NLA_BINARY, .len = IFALIASZ - 1 }, 1852 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1853 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1854 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1855 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1856 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1857 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1858 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1859 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1860 [IFLA_GSO_MAX_SEGS] = { .type = NLA_U32 }, 1861 [IFLA_GSO_MAX_SIZE] = { .type = NLA_U32 }, 1862 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1863 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1864 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1865 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1866 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1867 [IFLA_XDP] = { .type = NLA_NESTED }, 1868 [IFLA_EVENT] = { .type = NLA_U32 }, 1869 [IFLA_GROUP] = { .type = NLA_U32 }, 1870 [IFLA_TARGET_NETNSID] = { .type = NLA_S32 }, 1871 [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 }, 1872 [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 }, 1873 [IFLA_MIN_MTU] = { .type = NLA_U32 }, 1874 [IFLA_MAX_MTU] = { .type = NLA_U32 }, 1875 [IFLA_PROP_LIST] = { .type = NLA_NESTED }, 1876 [IFLA_ALT_IFNAME] = { .type = NLA_STRING, 1877 .len = ALTIFNAMSIZ - 1 }, 1878 [IFLA_PERM_ADDRESS] = { .type = NLA_REJECT }, 1879 [IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED }, 1880 [IFLA_NEW_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1), 1881 }; 1882 1883 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1884 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1885 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1886 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1887 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1888 }; 1889 1890 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1891 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1892 [IFLA_VF_BROADCAST] = { .type = NLA_REJECT }, 1893 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1894 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED }, 1895 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1896 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1897 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1898 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1899 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1900 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1901 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1902 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1903 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1904 }; 1905 1906 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1907 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1908 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1909 .len = PORT_PROFILE_MAX }, 1910 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1911 .len = PORT_UUID_MAX }, 1912 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1913 .len = PORT_UUID_MAX }, 1914 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1915 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1916 1917 /* Unused, but we need to keep it here since user space could 1918 * fill it. It's also broken with regard to NLA_BINARY use in 1919 * combination with structs. 1920 */ 1921 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1922 .len = sizeof(struct ifla_port_vsi) }, 1923 }; 1924 1925 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = { 1926 [IFLA_XDP_UNSPEC] = { .strict_start_type = IFLA_XDP_EXPECTED_FD }, 1927 [IFLA_XDP_FD] = { .type = NLA_S32 }, 1928 [IFLA_XDP_EXPECTED_FD] = { .type = NLA_S32 }, 1929 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 }, 1930 [IFLA_XDP_FLAGS] = { .type = NLA_U32 }, 1931 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 }, 1932 }; 1933 1934 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 1935 { 1936 const struct rtnl_link_ops *ops = NULL; 1937 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 1938 1939 if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0) 1940 return NULL; 1941 1942 if (linfo[IFLA_INFO_KIND]) { 1943 char kind[MODULE_NAME_LEN]; 1944 1945 nla_strscpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 1946 ops = rtnl_link_ops_get(kind); 1947 } 1948 1949 return ops; 1950 } 1951 1952 static bool link_master_filtered(struct net_device *dev, int master_idx) 1953 { 1954 struct net_device *master; 1955 1956 if (!master_idx) 1957 return false; 1958 1959 master = netdev_master_upper_dev_get(dev); 1960 if (!master || master->ifindex != master_idx) 1961 return true; 1962 1963 return false; 1964 } 1965 1966 static bool link_kind_filtered(const struct net_device *dev, 1967 const struct rtnl_link_ops *kind_ops) 1968 { 1969 if (kind_ops && dev->rtnl_link_ops != kind_ops) 1970 return true; 1971 1972 return false; 1973 } 1974 1975 static bool link_dump_filtered(struct net_device *dev, 1976 int master_idx, 1977 const struct rtnl_link_ops *kind_ops) 1978 { 1979 if (link_master_filtered(dev, master_idx) || 1980 link_kind_filtered(dev, kind_ops)) 1981 return true; 1982 1983 return false; 1984 } 1985 1986 /** 1987 * rtnl_get_net_ns_capable - Get netns if sufficiently privileged. 1988 * @sk: netlink socket 1989 * @netnsid: network namespace identifier 1990 * 1991 * Returns the network namespace identified by netnsid on success or an error 1992 * pointer on failure. 1993 */ 1994 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid) 1995 { 1996 struct net *net; 1997 1998 net = get_net_ns_by_id(sock_net(sk), netnsid); 1999 if (!net) 2000 return ERR_PTR(-EINVAL); 2001 2002 /* For now, the caller is required to have CAP_NET_ADMIN in 2003 * the user namespace owning the target net ns. 2004 */ 2005 if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) { 2006 put_net(net); 2007 return ERR_PTR(-EACCES); 2008 } 2009 return net; 2010 } 2011 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable); 2012 2013 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh, 2014 bool strict_check, struct nlattr **tb, 2015 struct netlink_ext_ack *extack) 2016 { 2017 int hdrlen; 2018 2019 if (strict_check) { 2020 struct ifinfomsg *ifm; 2021 2022 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 2023 NL_SET_ERR_MSG(extack, "Invalid header for link dump"); 2024 return -EINVAL; 2025 } 2026 2027 ifm = nlmsg_data(nlh); 2028 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 2029 ifm->ifi_change) { 2030 NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request"); 2031 return -EINVAL; 2032 } 2033 if (ifm->ifi_index) { 2034 NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps"); 2035 return -EINVAL; 2036 } 2037 2038 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, 2039 IFLA_MAX, ifla_policy, 2040 extack); 2041 } 2042 2043 /* A hack to preserve kernel<->userspace interface. 2044 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 2045 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 2046 * what iproute2 < v3.9.0 used. 2047 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 2048 * attribute, its netlink message is shorter than struct ifinfomsg. 2049 */ 2050 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2051 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2052 2053 return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, 2054 extack); 2055 } 2056 2057 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 2058 { 2059 struct netlink_ext_ack *extack = cb->extack; 2060 const struct nlmsghdr *nlh = cb->nlh; 2061 struct net *net = sock_net(skb->sk); 2062 struct net *tgt_net = net; 2063 int h, s_h; 2064 int idx = 0, s_idx; 2065 struct net_device *dev; 2066 struct hlist_head *head; 2067 struct nlattr *tb[IFLA_MAX+1]; 2068 u32 ext_filter_mask = 0; 2069 const struct rtnl_link_ops *kind_ops = NULL; 2070 unsigned int flags = NLM_F_MULTI; 2071 int master_idx = 0; 2072 int netnsid = -1; 2073 int err, i; 2074 2075 s_h = cb->args[0]; 2076 s_idx = cb->args[1]; 2077 2078 err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack); 2079 if (err < 0) { 2080 if (cb->strict_check) 2081 return err; 2082 2083 goto walk_entries; 2084 } 2085 2086 for (i = 0; i <= IFLA_MAX; ++i) { 2087 if (!tb[i]) 2088 continue; 2089 2090 /* new attributes should only be added with strict checking */ 2091 switch (i) { 2092 case IFLA_TARGET_NETNSID: 2093 netnsid = nla_get_s32(tb[i]); 2094 tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid); 2095 if (IS_ERR(tgt_net)) { 2096 NL_SET_ERR_MSG(extack, "Invalid target network namespace id"); 2097 return PTR_ERR(tgt_net); 2098 } 2099 break; 2100 case IFLA_EXT_MASK: 2101 ext_filter_mask = nla_get_u32(tb[i]); 2102 break; 2103 case IFLA_MASTER: 2104 master_idx = nla_get_u32(tb[i]); 2105 break; 2106 case IFLA_LINKINFO: 2107 kind_ops = linkinfo_to_kind_ops(tb[i]); 2108 break; 2109 default: 2110 if (cb->strict_check) { 2111 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request"); 2112 return -EINVAL; 2113 } 2114 } 2115 } 2116 2117 if (master_idx || kind_ops) 2118 flags |= NLM_F_DUMP_FILTERED; 2119 2120 walk_entries: 2121 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 2122 idx = 0; 2123 head = &tgt_net->dev_index_head[h]; 2124 hlist_for_each_entry(dev, head, index_hlist) { 2125 if (link_dump_filtered(dev, master_idx, kind_ops)) 2126 goto cont; 2127 if (idx < s_idx) 2128 goto cont; 2129 err = rtnl_fill_ifinfo(skb, dev, net, 2130 RTM_NEWLINK, 2131 NETLINK_CB(cb->skb).portid, 2132 nlh->nlmsg_seq, 0, flags, 2133 ext_filter_mask, 0, NULL, 0, 2134 netnsid, GFP_KERNEL); 2135 2136 if (err < 0) { 2137 if (likely(skb->len)) 2138 goto out; 2139 2140 goto out_err; 2141 } 2142 cont: 2143 idx++; 2144 } 2145 } 2146 out: 2147 err = skb->len; 2148 out_err: 2149 cb->args[1] = idx; 2150 cb->args[0] = h; 2151 cb->seq = tgt_net->dev_base_seq; 2152 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 2153 if (netnsid >= 0) 2154 put_net(tgt_net); 2155 2156 return err; 2157 } 2158 2159 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len, 2160 struct netlink_ext_ack *exterr) 2161 { 2162 return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy, 2163 exterr); 2164 } 2165 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 2166 2167 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 2168 { 2169 struct net *net; 2170 /* Examine the link attributes and figure out which 2171 * network namespace we are talking about. 2172 */ 2173 if (tb[IFLA_NET_NS_PID]) 2174 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 2175 else if (tb[IFLA_NET_NS_FD]) 2176 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 2177 else 2178 net = get_net(src_net); 2179 return net; 2180 } 2181 EXPORT_SYMBOL(rtnl_link_get_net); 2182 2183 /* Figure out which network namespace we are talking about by 2184 * examining the link attributes in the following order: 2185 * 2186 * 1. IFLA_NET_NS_PID 2187 * 2. IFLA_NET_NS_FD 2188 * 3. IFLA_TARGET_NETNSID 2189 */ 2190 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net, 2191 struct nlattr *tb[]) 2192 { 2193 struct net *net; 2194 2195 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) 2196 return rtnl_link_get_net(src_net, tb); 2197 2198 if (!tb[IFLA_TARGET_NETNSID]) 2199 return get_net(src_net); 2200 2201 net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID])); 2202 if (!net) 2203 return ERR_PTR(-EINVAL); 2204 2205 return net; 2206 } 2207 2208 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb, 2209 struct net *src_net, 2210 struct nlattr *tb[], int cap) 2211 { 2212 struct net *net; 2213 2214 net = rtnl_link_get_net_by_nlattr(src_net, tb); 2215 if (IS_ERR(net)) 2216 return net; 2217 2218 if (!netlink_ns_capable(skb, net->user_ns, cap)) { 2219 put_net(net); 2220 return ERR_PTR(-EPERM); 2221 } 2222 2223 return net; 2224 } 2225 2226 /* Verify that rtnetlink requests do not pass additional properties 2227 * potentially referring to different network namespaces. 2228 */ 2229 static int rtnl_ensure_unique_netns(struct nlattr *tb[], 2230 struct netlink_ext_ack *extack, 2231 bool netns_id_only) 2232 { 2233 2234 if (netns_id_only) { 2235 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD]) 2236 return 0; 2237 2238 NL_SET_ERR_MSG(extack, "specified netns attribute not supported"); 2239 return -EOPNOTSUPP; 2240 } 2241 2242 if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])) 2243 goto invalid_attr; 2244 2245 if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD])) 2246 goto invalid_attr; 2247 2248 if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID])) 2249 goto invalid_attr; 2250 2251 return 0; 2252 2253 invalid_attr: 2254 NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified"); 2255 return -EINVAL; 2256 } 2257 2258 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 2259 { 2260 if (dev) { 2261 if (tb[IFLA_ADDRESS] && 2262 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 2263 return -EINVAL; 2264 2265 if (tb[IFLA_BROADCAST] && 2266 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 2267 return -EINVAL; 2268 } 2269 2270 if (tb[IFLA_AF_SPEC]) { 2271 struct nlattr *af; 2272 int rem, err; 2273 2274 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2275 const struct rtnl_af_ops *af_ops; 2276 2277 rcu_read_lock(); 2278 af_ops = rtnl_af_lookup(nla_type(af)); 2279 if (!af_ops) { 2280 rcu_read_unlock(); 2281 return -EAFNOSUPPORT; 2282 } 2283 2284 if (!af_ops->set_link_af) { 2285 rcu_read_unlock(); 2286 return -EOPNOTSUPP; 2287 } 2288 2289 if (af_ops->validate_link_af) { 2290 err = af_ops->validate_link_af(dev, af); 2291 if (err < 0) { 2292 rcu_read_unlock(); 2293 return err; 2294 } 2295 } 2296 2297 rcu_read_unlock(); 2298 } 2299 } 2300 2301 return 0; 2302 } 2303 2304 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt, 2305 int guid_type) 2306 { 2307 const struct net_device_ops *ops = dev->netdev_ops; 2308 2309 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type); 2310 } 2311 2312 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type) 2313 { 2314 if (dev->type != ARPHRD_INFINIBAND) 2315 return -EOPNOTSUPP; 2316 2317 return handle_infiniband_guid(dev, ivt, guid_type); 2318 } 2319 2320 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 2321 { 2322 const struct net_device_ops *ops = dev->netdev_ops; 2323 int err = -EINVAL; 2324 2325 if (tb[IFLA_VF_MAC]) { 2326 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 2327 2328 if (ivm->vf >= INT_MAX) 2329 return -EINVAL; 2330 err = -EOPNOTSUPP; 2331 if (ops->ndo_set_vf_mac) 2332 err = ops->ndo_set_vf_mac(dev, ivm->vf, 2333 ivm->mac); 2334 if (err < 0) 2335 return err; 2336 } 2337 2338 if (tb[IFLA_VF_VLAN]) { 2339 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 2340 2341 if (ivv->vf >= INT_MAX) 2342 return -EINVAL; 2343 err = -EOPNOTSUPP; 2344 if (ops->ndo_set_vf_vlan) 2345 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 2346 ivv->qos, 2347 htons(ETH_P_8021Q)); 2348 if (err < 0) 2349 return err; 2350 } 2351 2352 if (tb[IFLA_VF_VLAN_LIST]) { 2353 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN]; 2354 struct nlattr *attr; 2355 int rem, len = 0; 2356 2357 err = -EOPNOTSUPP; 2358 if (!ops->ndo_set_vf_vlan) 2359 return err; 2360 2361 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) { 2362 if (nla_type(attr) != IFLA_VF_VLAN_INFO || 2363 nla_len(attr) < NLA_HDRLEN) { 2364 return -EINVAL; 2365 } 2366 if (len >= MAX_VLAN_LIST_LEN) 2367 return -EOPNOTSUPP; 2368 ivvl[len] = nla_data(attr); 2369 2370 len++; 2371 } 2372 if (len == 0) 2373 return -EINVAL; 2374 2375 if (ivvl[0]->vf >= INT_MAX) 2376 return -EINVAL; 2377 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan, 2378 ivvl[0]->qos, ivvl[0]->vlan_proto); 2379 if (err < 0) 2380 return err; 2381 } 2382 2383 if (tb[IFLA_VF_TX_RATE]) { 2384 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 2385 struct ifla_vf_info ivf; 2386 2387 if (ivt->vf >= INT_MAX) 2388 return -EINVAL; 2389 err = -EOPNOTSUPP; 2390 if (ops->ndo_get_vf_config) 2391 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 2392 if (err < 0) 2393 return err; 2394 2395 err = -EOPNOTSUPP; 2396 if (ops->ndo_set_vf_rate) 2397 err = ops->ndo_set_vf_rate(dev, ivt->vf, 2398 ivf.min_tx_rate, 2399 ivt->rate); 2400 if (err < 0) 2401 return err; 2402 } 2403 2404 if (tb[IFLA_VF_RATE]) { 2405 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 2406 2407 if (ivt->vf >= INT_MAX) 2408 return -EINVAL; 2409 err = -EOPNOTSUPP; 2410 if (ops->ndo_set_vf_rate) 2411 err = ops->ndo_set_vf_rate(dev, ivt->vf, 2412 ivt->min_tx_rate, 2413 ivt->max_tx_rate); 2414 if (err < 0) 2415 return err; 2416 } 2417 2418 if (tb[IFLA_VF_SPOOFCHK]) { 2419 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 2420 2421 if (ivs->vf >= INT_MAX) 2422 return -EINVAL; 2423 err = -EOPNOTSUPP; 2424 if (ops->ndo_set_vf_spoofchk) 2425 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 2426 ivs->setting); 2427 if (err < 0) 2428 return err; 2429 } 2430 2431 if (tb[IFLA_VF_LINK_STATE]) { 2432 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 2433 2434 if (ivl->vf >= INT_MAX) 2435 return -EINVAL; 2436 err = -EOPNOTSUPP; 2437 if (ops->ndo_set_vf_link_state) 2438 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 2439 ivl->link_state); 2440 if (err < 0) 2441 return err; 2442 } 2443 2444 if (tb[IFLA_VF_RSS_QUERY_EN]) { 2445 struct ifla_vf_rss_query_en *ivrssq_en; 2446 2447 err = -EOPNOTSUPP; 2448 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 2449 if (ivrssq_en->vf >= INT_MAX) 2450 return -EINVAL; 2451 if (ops->ndo_set_vf_rss_query_en) 2452 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 2453 ivrssq_en->setting); 2454 if (err < 0) 2455 return err; 2456 } 2457 2458 if (tb[IFLA_VF_TRUST]) { 2459 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 2460 2461 if (ivt->vf >= INT_MAX) 2462 return -EINVAL; 2463 err = -EOPNOTSUPP; 2464 if (ops->ndo_set_vf_trust) 2465 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 2466 if (err < 0) 2467 return err; 2468 } 2469 2470 if (tb[IFLA_VF_IB_NODE_GUID]) { 2471 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]); 2472 2473 if (ivt->vf >= INT_MAX) 2474 return -EINVAL; 2475 if (!ops->ndo_set_vf_guid) 2476 return -EOPNOTSUPP; 2477 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID); 2478 } 2479 2480 if (tb[IFLA_VF_IB_PORT_GUID]) { 2481 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]); 2482 2483 if (ivt->vf >= INT_MAX) 2484 return -EINVAL; 2485 if (!ops->ndo_set_vf_guid) 2486 return -EOPNOTSUPP; 2487 2488 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID); 2489 } 2490 2491 return err; 2492 } 2493 2494 static int do_set_master(struct net_device *dev, int ifindex, 2495 struct netlink_ext_ack *extack) 2496 { 2497 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 2498 const struct net_device_ops *ops; 2499 int err; 2500 2501 if (upper_dev) { 2502 if (upper_dev->ifindex == ifindex) 2503 return 0; 2504 ops = upper_dev->netdev_ops; 2505 if (ops->ndo_del_slave) { 2506 err = ops->ndo_del_slave(upper_dev, dev); 2507 if (err) 2508 return err; 2509 } else { 2510 return -EOPNOTSUPP; 2511 } 2512 } 2513 2514 if (ifindex) { 2515 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 2516 if (!upper_dev) 2517 return -EINVAL; 2518 ops = upper_dev->netdev_ops; 2519 if (ops->ndo_add_slave) { 2520 err = ops->ndo_add_slave(upper_dev, dev, extack); 2521 if (err) 2522 return err; 2523 } else { 2524 return -EOPNOTSUPP; 2525 } 2526 } 2527 return 0; 2528 } 2529 2530 static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = { 2531 [IFLA_PROTO_DOWN_REASON_MASK] = { .type = NLA_U32 }, 2532 [IFLA_PROTO_DOWN_REASON_VALUE] = { .type = NLA_U32 }, 2533 }; 2534 2535 static int do_set_proto_down(struct net_device *dev, 2536 struct nlattr *nl_proto_down, 2537 struct nlattr *nl_proto_down_reason, 2538 struct netlink_ext_ack *extack) 2539 { 2540 struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1]; 2541 const struct net_device_ops *ops = dev->netdev_ops; 2542 unsigned long mask = 0; 2543 u32 value; 2544 bool proto_down; 2545 int err; 2546 2547 if (!ops->ndo_change_proto_down) { 2548 NL_SET_ERR_MSG(extack, "Protodown not supported by device"); 2549 return -EOPNOTSUPP; 2550 } 2551 2552 if (nl_proto_down_reason) { 2553 err = nla_parse_nested_deprecated(pdreason, 2554 IFLA_PROTO_DOWN_REASON_MAX, 2555 nl_proto_down_reason, 2556 ifla_proto_down_reason_policy, 2557 NULL); 2558 if (err < 0) 2559 return err; 2560 2561 if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) { 2562 NL_SET_ERR_MSG(extack, "Invalid protodown reason value"); 2563 return -EINVAL; 2564 } 2565 2566 value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]); 2567 2568 if (pdreason[IFLA_PROTO_DOWN_REASON_MASK]) 2569 mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]); 2570 2571 dev_change_proto_down_reason(dev, mask, value); 2572 } 2573 2574 if (nl_proto_down) { 2575 proto_down = nla_get_u8(nl_proto_down); 2576 2577 /* Dont turn off protodown if there are active reasons */ 2578 if (!proto_down && dev->proto_down_reason) { 2579 NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons"); 2580 return -EBUSY; 2581 } 2582 err = dev_change_proto_down(dev, 2583 proto_down); 2584 if (err) 2585 return err; 2586 } 2587 2588 return 0; 2589 } 2590 2591 #define DO_SETLINK_MODIFIED 0x01 2592 /* notify flag means notify + modified. */ 2593 #define DO_SETLINK_NOTIFY 0x03 2594 static int do_setlink(const struct sk_buff *skb, 2595 struct net_device *dev, struct ifinfomsg *ifm, 2596 struct netlink_ext_ack *extack, 2597 struct nlattr **tb, char *ifname, int status) 2598 { 2599 const struct net_device_ops *ops = dev->netdev_ops; 2600 int err; 2601 2602 err = validate_linkmsg(dev, tb); 2603 if (err < 0) 2604 return err; 2605 2606 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) { 2607 struct net *net; 2608 int new_ifindex; 2609 2610 net = rtnl_link_get_net_capable(skb, dev_net(dev), 2611 tb, CAP_NET_ADMIN); 2612 if (IS_ERR(net)) { 2613 err = PTR_ERR(net); 2614 goto errout; 2615 } 2616 2617 if (tb[IFLA_NEW_IFINDEX]) 2618 new_ifindex = nla_get_s32(tb[IFLA_NEW_IFINDEX]); 2619 else 2620 new_ifindex = 0; 2621 2622 err = __dev_change_net_namespace(dev, net, ifname, new_ifindex); 2623 put_net(net); 2624 if (err) 2625 goto errout; 2626 status |= DO_SETLINK_MODIFIED; 2627 } 2628 2629 if (tb[IFLA_MAP]) { 2630 struct rtnl_link_ifmap *u_map; 2631 struct ifmap k_map; 2632 2633 if (!ops->ndo_set_config) { 2634 err = -EOPNOTSUPP; 2635 goto errout; 2636 } 2637 2638 if (!netif_device_present(dev)) { 2639 err = -ENODEV; 2640 goto errout; 2641 } 2642 2643 u_map = nla_data(tb[IFLA_MAP]); 2644 k_map.mem_start = (unsigned long) u_map->mem_start; 2645 k_map.mem_end = (unsigned long) u_map->mem_end; 2646 k_map.base_addr = (unsigned short) u_map->base_addr; 2647 k_map.irq = (unsigned char) u_map->irq; 2648 k_map.dma = (unsigned char) u_map->dma; 2649 k_map.port = (unsigned char) u_map->port; 2650 2651 err = ops->ndo_set_config(dev, &k_map); 2652 if (err < 0) 2653 goto errout; 2654 2655 status |= DO_SETLINK_NOTIFY; 2656 } 2657 2658 if (tb[IFLA_ADDRESS]) { 2659 struct sockaddr *sa; 2660 int len; 2661 2662 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len, 2663 sizeof(*sa)); 2664 sa = kmalloc(len, GFP_KERNEL); 2665 if (!sa) { 2666 err = -ENOMEM; 2667 goto errout; 2668 } 2669 sa->sa_family = dev->type; 2670 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 2671 dev->addr_len); 2672 err = dev_set_mac_address_user(dev, sa, extack); 2673 kfree(sa); 2674 if (err) 2675 goto errout; 2676 status |= DO_SETLINK_MODIFIED; 2677 } 2678 2679 if (tb[IFLA_MTU]) { 2680 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack); 2681 if (err < 0) 2682 goto errout; 2683 status |= DO_SETLINK_MODIFIED; 2684 } 2685 2686 if (tb[IFLA_GROUP]) { 2687 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2688 status |= DO_SETLINK_NOTIFY; 2689 } 2690 2691 /* 2692 * Interface selected by interface index but interface 2693 * name provided implies that a name change has been 2694 * requested. 2695 */ 2696 if (ifm->ifi_index > 0 && ifname[0]) { 2697 err = dev_change_name(dev, ifname); 2698 if (err < 0) 2699 goto errout; 2700 status |= DO_SETLINK_MODIFIED; 2701 } 2702 2703 if (tb[IFLA_IFALIAS]) { 2704 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 2705 nla_len(tb[IFLA_IFALIAS])); 2706 if (err < 0) 2707 goto errout; 2708 status |= DO_SETLINK_NOTIFY; 2709 } 2710 2711 if (tb[IFLA_BROADCAST]) { 2712 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 2713 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 2714 } 2715 2716 if (ifm->ifi_flags || ifm->ifi_change) { 2717 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm), 2718 extack); 2719 if (err < 0) 2720 goto errout; 2721 } 2722 2723 if (tb[IFLA_MASTER]) { 2724 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); 2725 if (err) 2726 goto errout; 2727 status |= DO_SETLINK_MODIFIED; 2728 } 2729 2730 if (tb[IFLA_CARRIER]) { 2731 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 2732 if (err) 2733 goto errout; 2734 status |= DO_SETLINK_MODIFIED; 2735 } 2736 2737 if (tb[IFLA_TXQLEN]) { 2738 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]); 2739 2740 err = dev_change_tx_queue_len(dev, value); 2741 if (err) 2742 goto errout; 2743 status |= DO_SETLINK_MODIFIED; 2744 } 2745 2746 if (tb[IFLA_GSO_MAX_SIZE]) { 2747 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]); 2748 2749 if (max_size > GSO_MAX_SIZE) { 2750 err = -EINVAL; 2751 goto errout; 2752 } 2753 2754 if (dev->gso_max_size ^ max_size) { 2755 netif_set_gso_max_size(dev, max_size); 2756 status |= DO_SETLINK_MODIFIED; 2757 } 2758 } 2759 2760 if (tb[IFLA_GSO_MAX_SEGS]) { 2761 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]); 2762 2763 if (max_segs > GSO_MAX_SEGS) { 2764 err = -EINVAL; 2765 goto errout; 2766 } 2767 2768 if (dev->gso_max_segs ^ max_segs) { 2769 dev->gso_max_segs = max_segs; 2770 status |= DO_SETLINK_MODIFIED; 2771 } 2772 } 2773 2774 if (tb[IFLA_OPERSTATE]) 2775 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2776 2777 if (tb[IFLA_LINKMODE]) { 2778 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 2779 2780 write_lock_bh(&dev_base_lock); 2781 if (dev->link_mode ^ value) 2782 status |= DO_SETLINK_NOTIFY; 2783 dev->link_mode = value; 2784 write_unlock_bh(&dev_base_lock); 2785 } 2786 2787 if (tb[IFLA_VFINFO_LIST]) { 2788 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 2789 struct nlattr *attr; 2790 int rem; 2791 2792 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 2793 if (nla_type(attr) != IFLA_VF_INFO || 2794 nla_len(attr) < NLA_HDRLEN) { 2795 err = -EINVAL; 2796 goto errout; 2797 } 2798 err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX, 2799 attr, 2800 ifla_vf_policy, 2801 NULL); 2802 if (err < 0) 2803 goto errout; 2804 err = do_setvfinfo(dev, vfinfo); 2805 if (err < 0) 2806 goto errout; 2807 status |= DO_SETLINK_NOTIFY; 2808 } 2809 } 2810 err = 0; 2811 2812 if (tb[IFLA_VF_PORTS]) { 2813 struct nlattr *port[IFLA_PORT_MAX+1]; 2814 struct nlattr *attr; 2815 int vf; 2816 int rem; 2817 2818 err = -EOPNOTSUPP; 2819 if (!ops->ndo_set_vf_port) 2820 goto errout; 2821 2822 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 2823 if (nla_type(attr) != IFLA_VF_PORT || 2824 nla_len(attr) < NLA_HDRLEN) { 2825 err = -EINVAL; 2826 goto errout; 2827 } 2828 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX, 2829 attr, 2830 ifla_port_policy, 2831 NULL); 2832 if (err < 0) 2833 goto errout; 2834 if (!port[IFLA_PORT_VF]) { 2835 err = -EOPNOTSUPP; 2836 goto errout; 2837 } 2838 vf = nla_get_u32(port[IFLA_PORT_VF]); 2839 err = ops->ndo_set_vf_port(dev, vf, port); 2840 if (err < 0) 2841 goto errout; 2842 status |= DO_SETLINK_NOTIFY; 2843 } 2844 } 2845 err = 0; 2846 2847 if (tb[IFLA_PORT_SELF]) { 2848 struct nlattr *port[IFLA_PORT_MAX+1]; 2849 2850 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX, 2851 tb[IFLA_PORT_SELF], 2852 ifla_port_policy, NULL); 2853 if (err < 0) 2854 goto errout; 2855 2856 err = -EOPNOTSUPP; 2857 if (ops->ndo_set_vf_port) 2858 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 2859 if (err < 0) 2860 goto errout; 2861 status |= DO_SETLINK_NOTIFY; 2862 } 2863 2864 if (tb[IFLA_AF_SPEC]) { 2865 struct nlattr *af; 2866 int rem; 2867 2868 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2869 const struct rtnl_af_ops *af_ops; 2870 2871 rcu_read_lock(); 2872 2873 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af)))); 2874 2875 err = af_ops->set_link_af(dev, af, extack); 2876 if (err < 0) { 2877 rcu_read_unlock(); 2878 goto errout; 2879 } 2880 2881 rcu_read_unlock(); 2882 status |= DO_SETLINK_NOTIFY; 2883 } 2884 } 2885 err = 0; 2886 2887 if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) { 2888 err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN], 2889 tb[IFLA_PROTO_DOWN_REASON], extack); 2890 if (err) 2891 goto errout; 2892 status |= DO_SETLINK_NOTIFY; 2893 } 2894 2895 if (tb[IFLA_XDP]) { 2896 struct nlattr *xdp[IFLA_XDP_MAX + 1]; 2897 u32 xdp_flags = 0; 2898 2899 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX, 2900 tb[IFLA_XDP], 2901 ifla_xdp_policy, NULL); 2902 if (err < 0) 2903 goto errout; 2904 2905 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) { 2906 err = -EINVAL; 2907 goto errout; 2908 } 2909 2910 if (xdp[IFLA_XDP_FLAGS]) { 2911 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]); 2912 if (xdp_flags & ~XDP_FLAGS_MASK) { 2913 err = -EINVAL; 2914 goto errout; 2915 } 2916 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) { 2917 err = -EINVAL; 2918 goto errout; 2919 } 2920 } 2921 2922 if (xdp[IFLA_XDP_FD]) { 2923 int expected_fd = -1; 2924 2925 if (xdp_flags & XDP_FLAGS_REPLACE) { 2926 if (!xdp[IFLA_XDP_EXPECTED_FD]) { 2927 err = -EINVAL; 2928 goto errout; 2929 } 2930 expected_fd = 2931 nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]); 2932 } 2933 2934 err = dev_change_xdp_fd(dev, extack, 2935 nla_get_s32(xdp[IFLA_XDP_FD]), 2936 expected_fd, 2937 xdp_flags); 2938 if (err) 2939 goto errout; 2940 status |= DO_SETLINK_NOTIFY; 2941 } 2942 } 2943 2944 errout: 2945 if (status & DO_SETLINK_MODIFIED) { 2946 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY) 2947 netdev_state_change(dev); 2948 2949 if (err < 0) 2950 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", 2951 dev->name); 2952 } 2953 2954 return err; 2955 } 2956 2957 static struct net_device *rtnl_dev_get(struct net *net, 2958 struct nlattr *ifname_attr, 2959 struct nlattr *altifname_attr, 2960 char *ifname) 2961 { 2962 char buffer[ALTIFNAMSIZ]; 2963 2964 if (!ifname) { 2965 ifname = buffer; 2966 if (ifname_attr) 2967 nla_strscpy(ifname, ifname_attr, IFNAMSIZ); 2968 else if (altifname_attr) 2969 nla_strscpy(ifname, altifname_attr, ALTIFNAMSIZ); 2970 else 2971 return NULL; 2972 } 2973 2974 return __dev_get_by_name(net, ifname); 2975 } 2976 2977 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 2978 struct netlink_ext_ack *extack) 2979 { 2980 struct net *net = sock_net(skb->sk); 2981 struct ifinfomsg *ifm; 2982 struct net_device *dev; 2983 int err; 2984 struct nlattr *tb[IFLA_MAX+1]; 2985 char ifname[IFNAMSIZ]; 2986 2987 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 2988 ifla_policy, extack); 2989 if (err < 0) 2990 goto errout; 2991 2992 err = rtnl_ensure_unique_netns(tb, extack, false); 2993 if (err < 0) 2994 goto errout; 2995 2996 if (tb[IFLA_IFNAME]) 2997 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2998 else 2999 ifname[0] = '\0'; 3000 3001 err = -EINVAL; 3002 ifm = nlmsg_data(nlh); 3003 if (ifm->ifi_index > 0) 3004 dev = __dev_get_by_index(net, ifm->ifi_index); 3005 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3006 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname); 3007 else 3008 goto errout; 3009 3010 if (dev == NULL) { 3011 err = -ENODEV; 3012 goto errout; 3013 } 3014 3015 err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0); 3016 errout: 3017 return err; 3018 } 3019 3020 static int rtnl_group_dellink(const struct net *net, int group) 3021 { 3022 struct net_device *dev, *aux; 3023 LIST_HEAD(list_kill); 3024 bool found = false; 3025 3026 if (!group) 3027 return -EPERM; 3028 3029 for_each_netdev(net, dev) { 3030 if (dev->group == group) { 3031 const struct rtnl_link_ops *ops; 3032 3033 found = true; 3034 ops = dev->rtnl_link_ops; 3035 if (!ops || !ops->dellink) 3036 return -EOPNOTSUPP; 3037 } 3038 } 3039 3040 if (!found) 3041 return -ENODEV; 3042 3043 for_each_netdev_safe(net, dev, aux) { 3044 if (dev->group == group) { 3045 const struct rtnl_link_ops *ops; 3046 3047 ops = dev->rtnl_link_ops; 3048 ops->dellink(dev, &list_kill); 3049 } 3050 } 3051 unregister_netdevice_many(&list_kill); 3052 3053 return 0; 3054 } 3055 3056 int rtnl_delete_link(struct net_device *dev) 3057 { 3058 const struct rtnl_link_ops *ops; 3059 LIST_HEAD(list_kill); 3060 3061 ops = dev->rtnl_link_ops; 3062 if (!ops || !ops->dellink) 3063 return -EOPNOTSUPP; 3064 3065 ops->dellink(dev, &list_kill); 3066 unregister_netdevice_many(&list_kill); 3067 3068 return 0; 3069 } 3070 EXPORT_SYMBOL_GPL(rtnl_delete_link); 3071 3072 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 3073 struct netlink_ext_ack *extack) 3074 { 3075 struct net *net = sock_net(skb->sk); 3076 struct net *tgt_net = net; 3077 struct net_device *dev = NULL; 3078 struct ifinfomsg *ifm; 3079 struct nlattr *tb[IFLA_MAX+1]; 3080 int err; 3081 int netnsid = -1; 3082 3083 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3084 ifla_policy, extack); 3085 if (err < 0) 3086 return err; 3087 3088 err = rtnl_ensure_unique_netns(tb, extack, true); 3089 if (err < 0) 3090 return err; 3091 3092 if (tb[IFLA_TARGET_NETNSID]) { 3093 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 3094 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid); 3095 if (IS_ERR(tgt_net)) 3096 return PTR_ERR(tgt_net); 3097 } 3098 3099 err = -EINVAL; 3100 ifm = nlmsg_data(nlh); 3101 if (ifm->ifi_index > 0) 3102 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 3103 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3104 dev = rtnl_dev_get(net, tb[IFLA_IFNAME], 3105 tb[IFLA_ALT_IFNAME], NULL); 3106 else if (tb[IFLA_GROUP]) 3107 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP])); 3108 else 3109 goto out; 3110 3111 if (!dev) { 3112 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0) 3113 err = -ENODEV; 3114 3115 goto out; 3116 } 3117 3118 err = rtnl_delete_link(dev); 3119 3120 out: 3121 if (netnsid >= 0) 3122 put_net(tgt_net); 3123 3124 return err; 3125 } 3126 3127 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 3128 { 3129 unsigned int old_flags; 3130 int err; 3131 3132 old_flags = dev->flags; 3133 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 3134 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm), 3135 NULL); 3136 if (err < 0) 3137 return err; 3138 } 3139 3140 if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) { 3141 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags)); 3142 } else { 3143 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 3144 __dev_notify_flags(dev, old_flags, ~0U); 3145 } 3146 return 0; 3147 } 3148 EXPORT_SYMBOL(rtnl_configure_link); 3149 3150 struct net_device *rtnl_create_link(struct net *net, const char *ifname, 3151 unsigned char name_assign_type, 3152 const struct rtnl_link_ops *ops, 3153 struct nlattr *tb[], 3154 struct netlink_ext_ack *extack) 3155 { 3156 struct net_device *dev; 3157 unsigned int num_tx_queues = 1; 3158 unsigned int num_rx_queues = 1; 3159 3160 if (tb[IFLA_NUM_TX_QUEUES]) 3161 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 3162 else if (ops->get_num_tx_queues) 3163 num_tx_queues = ops->get_num_tx_queues(); 3164 3165 if (tb[IFLA_NUM_RX_QUEUES]) 3166 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 3167 else if (ops->get_num_rx_queues) 3168 num_rx_queues = ops->get_num_rx_queues(); 3169 3170 if (num_tx_queues < 1 || num_tx_queues > 4096) { 3171 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues"); 3172 return ERR_PTR(-EINVAL); 3173 } 3174 3175 if (num_rx_queues < 1 || num_rx_queues > 4096) { 3176 NL_SET_ERR_MSG(extack, "Invalid number of receive queues"); 3177 return ERR_PTR(-EINVAL); 3178 } 3179 3180 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 3181 ops->setup, num_tx_queues, num_rx_queues); 3182 if (!dev) 3183 return ERR_PTR(-ENOMEM); 3184 3185 dev_net_set(dev, net); 3186 dev->rtnl_link_ops = ops; 3187 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 3188 3189 if (tb[IFLA_MTU]) { 3190 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3191 int err; 3192 3193 err = dev_validate_mtu(dev, mtu, extack); 3194 if (err) { 3195 free_netdev(dev); 3196 return ERR_PTR(err); 3197 } 3198 dev->mtu = mtu; 3199 } 3200 if (tb[IFLA_ADDRESS]) { 3201 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 3202 nla_len(tb[IFLA_ADDRESS])); 3203 dev->addr_assign_type = NET_ADDR_SET; 3204 } 3205 if (tb[IFLA_BROADCAST]) 3206 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 3207 nla_len(tb[IFLA_BROADCAST])); 3208 if (tb[IFLA_TXQLEN]) 3209 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 3210 if (tb[IFLA_OPERSTATE]) 3211 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 3212 if (tb[IFLA_LINKMODE]) 3213 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 3214 if (tb[IFLA_GROUP]) 3215 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 3216 if (tb[IFLA_GSO_MAX_SIZE]) 3217 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE])); 3218 if (tb[IFLA_GSO_MAX_SEGS]) 3219 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]); 3220 3221 return dev; 3222 } 3223 EXPORT_SYMBOL(rtnl_create_link); 3224 3225 static int rtnl_group_changelink(const struct sk_buff *skb, 3226 struct net *net, int group, 3227 struct ifinfomsg *ifm, 3228 struct netlink_ext_ack *extack, 3229 struct nlattr **tb) 3230 { 3231 struct net_device *dev, *aux; 3232 int err; 3233 3234 for_each_netdev_safe(net, dev, aux) { 3235 if (dev->group == group) { 3236 err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0); 3237 if (err < 0) 3238 return err; 3239 } 3240 } 3241 3242 return 0; 3243 } 3244 3245 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3246 struct nlattr **attr, struct netlink_ext_ack *extack) 3247 { 3248 struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1]; 3249 unsigned char name_assign_type = NET_NAME_USER; 3250 struct nlattr *linkinfo[IFLA_INFO_MAX + 1]; 3251 const struct rtnl_link_ops *m_ops = NULL; 3252 struct net_device *master_dev = NULL; 3253 struct net *net = sock_net(skb->sk); 3254 const struct rtnl_link_ops *ops; 3255 struct nlattr *tb[IFLA_MAX + 1]; 3256 struct net *dest_net, *link_net; 3257 struct nlattr **slave_data; 3258 char kind[MODULE_NAME_LEN]; 3259 struct net_device *dev; 3260 struct ifinfomsg *ifm; 3261 char ifname[IFNAMSIZ]; 3262 struct nlattr **data; 3263 int err; 3264 3265 #ifdef CONFIG_MODULES 3266 replay: 3267 #endif 3268 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3269 ifla_policy, extack); 3270 if (err < 0) 3271 return err; 3272 3273 err = rtnl_ensure_unique_netns(tb, extack, false); 3274 if (err < 0) 3275 return err; 3276 3277 if (tb[IFLA_IFNAME]) 3278 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 3279 else 3280 ifname[0] = '\0'; 3281 3282 ifm = nlmsg_data(nlh); 3283 if (ifm->ifi_index > 0) 3284 dev = __dev_get_by_index(net, ifm->ifi_index); 3285 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3286 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname); 3287 else 3288 dev = NULL; 3289 3290 if (dev) { 3291 master_dev = netdev_master_upper_dev_get(dev); 3292 if (master_dev) 3293 m_ops = master_dev->rtnl_link_ops; 3294 } 3295 3296 err = validate_linkmsg(dev, tb); 3297 if (err < 0) 3298 return err; 3299 3300 if (tb[IFLA_LINKINFO]) { 3301 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX, 3302 tb[IFLA_LINKINFO], 3303 ifla_info_policy, NULL); 3304 if (err < 0) 3305 return err; 3306 } else 3307 memset(linkinfo, 0, sizeof(linkinfo)); 3308 3309 if (linkinfo[IFLA_INFO_KIND]) { 3310 nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 3311 ops = rtnl_link_ops_get(kind); 3312 } else { 3313 kind[0] = '\0'; 3314 ops = NULL; 3315 } 3316 3317 data = NULL; 3318 if (ops) { 3319 if (ops->maxtype > RTNL_MAX_TYPE) 3320 return -EINVAL; 3321 3322 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 3323 err = nla_parse_nested_deprecated(attr, ops->maxtype, 3324 linkinfo[IFLA_INFO_DATA], 3325 ops->policy, extack); 3326 if (err < 0) 3327 return err; 3328 data = attr; 3329 } 3330 if (ops->validate) { 3331 err = ops->validate(tb, data, extack); 3332 if (err < 0) 3333 return err; 3334 } 3335 } 3336 3337 slave_data = NULL; 3338 if (m_ops) { 3339 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE) 3340 return -EINVAL; 3341 3342 if (m_ops->slave_maxtype && 3343 linkinfo[IFLA_INFO_SLAVE_DATA]) { 3344 err = nla_parse_nested_deprecated(slave_attr, 3345 m_ops->slave_maxtype, 3346 linkinfo[IFLA_INFO_SLAVE_DATA], 3347 m_ops->slave_policy, 3348 extack); 3349 if (err < 0) 3350 return err; 3351 slave_data = slave_attr; 3352 } 3353 } 3354 3355 if (dev) { 3356 int status = 0; 3357 3358 if (nlh->nlmsg_flags & NLM_F_EXCL) 3359 return -EEXIST; 3360 if (nlh->nlmsg_flags & NLM_F_REPLACE) 3361 return -EOPNOTSUPP; 3362 3363 if (linkinfo[IFLA_INFO_DATA]) { 3364 if (!ops || ops != dev->rtnl_link_ops || 3365 !ops->changelink) 3366 return -EOPNOTSUPP; 3367 3368 err = ops->changelink(dev, tb, data, extack); 3369 if (err < 0) 3370 return err; 3371 status |= DO_SETLINK_NOTIFY; 3372 } 3373 3374 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 3375 if (!m_ops || !m_ops->slave_changelink) 3376 return -EOPNOTSUPP; 3377 3378 err = m_ops->slave_changelink(master_dev, dev, tb, 3379 slave_data, extack); 3380 if (err < 0) 3381 return err; 3382 status |= DO_SETLINK_NOTIFY; 3383 } 3384 3385 return do_setlink(skb, dev, ifm, extack, tb, ifname, status); 3386 } 3387 3388 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 3389 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 3390 return rtnl_group_changelink(skb, net, 3391 nla_get_u32(tb[IFLA_GROUP]), 3392 ifm, extack, tb); 3393 return -ENODEV; 3394 } 3395 3396 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO]) 3397 return -EOPNOTSUPP; 3398 3399 if (!ops) { 3400 #ifdef CONFIG_MODULES 3401 if (kind[0]) { 3402 __rtnl_unlock(); 3403 request_module("rtnl-link-%s", kind); 3404 rtnl_lock(); 3405 ops = rtnl_link_ops_get(kind); 3406 if (ops) 3407 goto replay; 3408 } 3409 #endif 3410 NL_SET_ERR_MSG(extack, "Unknown device type"); 3411 return -EOPNOTSUPP; 3412 } 3413 3414 if (!ops->setup) 3415 return -EOPNOTSUPP; 3416 3417 if (!ifname[0]) { 3418 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 3419 name_assign_type = NET_NAME_ENUM; 3420 } 3421 3422 dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN); 3423 if (IS_ERR(dest_net)) 3424 return PTR_ERR(dest_net); 3425 3426 if (tb[IFLA_LINK_NETNSID]) { 3427 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 3428 3429 link_net = get_net_ns_by_id(dest_net, id); 3430 if (!link_net) { 3431 NL_SET_ERR_MSG(extack, "Unknown network namespace id"); 3432 err = -EINVAL; 3433 goto out; 3434 } 3435 err = -EPERM; 3436 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 3437 goto out; 3438 } else { 3439 link_net = NULL; 3440 } 3441 3442 dev = rtnl_create_link(link_net ? : dest_net, ifname, 3443 name_assign_type, ops, tb, extack); 3444 if (IS_ERR(dev)) { 3445 err = PTR_ERR(dev); 3446 goto out; 3447 } 3448 3449 dev->ifindex = ifm->ifi_index; 3450 3451 if (ops->newlink) 3452 err = ops->newlink(link_net ? : net, dev, tb, data, extack); 3453 else 3454 err = register_netdevice(dev); 3455 if (err < 0) { 3456 free_netdev(dev); 3457 goto out; 3458 } 3459 3460 err = rtnl_configure_link(dev, ifm); 3461 if (err < 0) 3462 goto out_unregister; 3463 if (link_net) { 3464 err = dev_change_net_namespace(dev, dest_net, ifname); 3465 if (err < 0) 3466 goto out_unregister; 3467 } 3468 if (tb[IFLA_MASTER]) { 3469 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); 3470 if (err) 3471 goto out_unregister; 3472 } 3473 out: 3474 if (link_net) 3475 put_net(link_net); 3476 put_net(dest_net); 3477 return err; 3478 out_unregister: 3479 if (ops->newlink) { 3480 LIST_HEAD(list_kill); 3481 3482 ops->dellink(dev, &list_kill); 3483 unregister_netdevice_many(&list_kill); 3484 } else { 3485 unregister_netdevice(dev); 3486 } 3487 goto out; 3488 } 3489 3490 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3491 struct netlink_ext_ack *extack) 3492 { 3493 struct nlattr **attr; 3494 int ret; 3495 3496 attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL); 3497 if (!attr) 3498 return -ENOMEM; 3499 3500 ret = __rtnl_newlink(skb, nlh, attr, extack); 3501 kfree(attr); 3502 return ret; 3503 } 3504 3505 static int rtnl_valid_getlink_req(struct sk_buff *skb, 3506 const struct nlmsghdr *nlh, 3507 struct nlattr **tb, 3508 struct netlink_ext_ack *extack) 3509 { 3510 struct ifinfomsg *ifm; 3511 int i, err; 3512 3513 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 3514 NL_SET_ERR_MSG(extack, "Invalid header for get link"); 3515 return -EINVAL; 3516 } 3517 3518 if (!netlink_strict_get_check(skb)) 3519 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3520 ifla_policy, extack); 3521 3522 ifm = nlmsg_data(nlh); 3523 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 3524 ifm->ifi_change) { 3525 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request"); 3526 return -EINVAL; 3527 } 3528 3529 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX, 3530 ifla_policy, extack); 3531 if (err) 3532 return err; 3533 3534 for (i = 0; i <= IFLA_MAX; i++) { 3535 if (!tb[i]) 3536 continue; 3537 3538 switch (i) { 3539 case IFLA_IFNAME: 3540 case IFLA_ALT_IFNAME: 3541 case IFLA_EXT_MASK: 3542 case IFLA_TARGET_NETNSID: 3543 break; 3544 default: 3545 NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request"); 3546 return -EINVAL; 3547 } 3548 } 3549 3550 return 0; 3551 } 3552 3553 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3554 struct netlink_ext_ack *extack) 3555 { 3556 struct net *net = sock_net(skb->sk); 3557 struct net *tgt_net = net; 3558 struct ifinfomsg *ifm; 3559 struct nlattr *tb[IFLA_MAX+1]; 3560 struct net_device *dev = NULL; 3561 struct sk_buff *nskb; 3562 int netnsid = -1; 3563 int err; 3564 u32 ext_filter_mask = 0; 3565 3566 err = rtnl_valid_getlink_req(skb, nlh, tb, extack); 3567 if (err < 0) 3568 return err; 3569 3570 err = rtnl_ensure_unique_netns(tb, extack, true); 3571 if (err < 0) 3572 return err; 3573 3574 if (tb[IFLA_TARGET_NETNSID]) { 3575 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 3576 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid); 3577 if (IS_ERR(tgt_net)) 3578 return PTR_ERR(tgt_net); 3579 } 3580 3581 if (tb[IFLA_EXT_MASK]) 3582 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 3583 3584 err = -EINVAL; 3585 ifm = nlmsg_data(nlh); 3586 if (ifm->ifi_index > 0) 3587 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 3588 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3589 dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME], 3590 tb[IFLA_ALT_IFNAME], NULL); 3591 else 3592 goto out; 3593 3594 err = -ENODEV; 3595 if (dev == NULL) 3596 goto out; 3597 3598 err = -ENOBUFS; 3599 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 3600 if (nskb == NULL) 3601 goto out; 3602 3603 err = rtnl_fill_ifinfo(nskb, dev, net, 3604 RTM_NEWLINK, NETLINK_CB(skb).portid, 3605 nlh->nlmsg_seq, 0, 0, ext_filter_mask, 3606 0, NULL, 0, netnsid, GFP_KERNEL); 3607 if (err < 0) { 3608 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 3609 WARN_ON(err == -EMSGSIZE); 3610 kfree_skb(nskb); 3611 } else 3612 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 3613 out: 3614 if (netnsid >= 0) 3615 put_net(tgt_net); 3616 3617 return err; 3618 } 3619 3620 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr, 3621 bool *changed, struct netlink_ext_ack *extack) 3622 { 3623 char *alt_ifname; 3624 int err; 3625 3626 err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack); 3627 if (err) 3628 return err; 3629 3630 alt_ifname = nla_strdup(attr, GFP_KERNEL); 3631 if (!alt_ifname) 3632 return -ENOMEM; 3633 3634 if (cmd == RTM_NEWLINKPROP) { 3635 err = netdev_name_node_alt_create(dev, alt_ifname); 3636 if (!err) 3637 alt_ifname = NULL; 3638 } else if (cmd == RTM_DELLINKPROP) { 3639 err = netdev_name_node_alt_destroy(dev, alt_ifname); 3640 } else { 3641 WARN_ON_ONCE(1); 3642 err = -EINVAL; 3643 } 3644 3645 kfree(alt_ifname); 3646 if (!err) 3647 *changed = true; 3648 return err; 3649 } 3650 3651 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh, 3652 struct netlink_ext_ack *extack) 3653 { 3654 struct net *net = sock_net(skb->sk); 3655 struct nlattr *tb[IFLA_MAX + 1]; 3656 struct net_device *dev; 3657 struct ifinfomsg *ifm; 3658 bool changed = false; 3659 struct nlattr *attr; 3660 int err, rem; 3661 3662 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack); 3663 if (err) 3664 return err; 3665 3666 err = rtnl_ensure_unique_netns(tb, extack, true); 3667 if (err) 3668 return err; 3669 3670 ifm = nlmsg_data(nlh); 3671 if (ifm->ifi_index > 0) 3672 dev = __dev_get_by_index(net, ifm->ifi_index); 3673 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3674 dev = rtnl_dev_get(net, tb[IFLA_IFNAME], 3675 tb[IFLA_ALT_IFNAME], NULL); 3676 else 3677 return -EINVAL; 3678 3679 if (!dev) 3680 return -ENODEV; 3681 3682 if (!tb[IFLA_PROP_LIST]) 3683 return 0; 3684 3685 nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) { 3686 switch (nla_type(attr)) { 3687 case IFLA_ALT_IFNAME: 3688 err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack); 3689 if (err) 3690 return err; 3691 break; 3692 } 3693 } 3694 3695 if (changed) 3696 netdev_state_change(dev); 3697 return 0; 3698 } 3699 3700 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh, 3701 struct netlink_ext_ack *extack) 3702 { 3703 return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack); 3704 } 3705 3706 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh, 3707 struct netlink_ext_ack *extack) 3708 { 3709 return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack); 3710 } 3711 3712 static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 3713 { 3714 struct net *net = sock_net(skb->sk); 3715 size_t min_ifinfo_dump_size = 0; 3716 struct nlattr *tb[IFLA_MAX+1]; 3717 u32 ext_filter_mask = 0; 3718 struct net_device *dev; 3719 int hdrlen; 3720 3721 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 3722 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 3723 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 3724 3725 if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) { 3726 if (tb[IFLA_EXT_MASK]) 3727 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 3728 } 3729 3730 if (!ext_filter_mask) 3731 return NLMSG_GOODSIZE; 3732 /* 3733 * traverse the list of net devices and compute the minimum 3734 * buffer size based upon the filter mask. 3735 */ 3736 rcu_read_lock(); 3737 for_each_netdev_rcu(net, dev) { 3738 min_ifinfo_dump_size = max(min_ifinfo_dump_size, 3739 if_nlmsg_size(dev, ext_filter_mask)); 3740 } 3741 rcu_read_unlock(); 3742 3743 return nlmsg_total_size(min_ifinfo_dump_size); 3744 } 3745 3746 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 3747 { 3748 int idx; 3749 int s_idx = cb->family; 3750 int type = cb->nlh->nlmsg_type - RTM_BASE; 3751 int ret = 0; 3752 3753 if (s_idx == 0) 3754 s_idx = 1; 3755 3756 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 3757 struct rtnl_link __rcu **tab; 3758 struct rtnl_link *link; 3759 rtnl_dumpit_func dumpit; 3760 3761 if (idx < s_idx || idx == PF_PACKET) 3762 continue; 3763 3764 if (type < 0 || type >= RTM_NR_MSGTYPES) 3765 continue; 3766 3767 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]); 3768 if (!tab) 3769 continue; 3770 3771 link = rcu_dereference_rtnl(tab[type]); 3772 if (!link) 3773 continue; 3774 3775 dumpit = link->dumpit; 3776 if (!dumpit) 3777 continue; 3778 3779 if (idx > s_idx) { 3780 memset(&cb->args[0], 0, sizeof(cb->args)); 3781 cb->prev_seq = 0; 3782 cb->seq = 0; 3783 } 3784 ret = dumpit(skb, cb); 3785 if (ret) 3786 break; 3787 } 3788 cb->family = idx; 3789 3790 return skb->len ? : ret; 3791 } 3792 3793 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 3794 unsigned int change, 3795 u32 event, gfp_t flags, int *new_nsid, 3796 int new_ifindex) 3797 { 3798 struct net *net = dev_net(dev); 3799 struct sk_buff *skb; 3800 int err = -ENOBUFS; 3801 size_t if_info_size; 3802 3803 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 3804 if (skb == NULL) 3805 goto errout; 3806 3807 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev), 3808 type, 0, 0, change, 0, 0, event, 3809 new_nsid, new_ifindex, -1, flags); 3810 if (err < 0) { 3811 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 3812 WARN_ON(err == -EMSGSIZE); 3813 kfree_skb(skb); 3814 goto errout; 3815 } 3816 return skb; 3817 errout: 3818 if (err < 0) 3819 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3820 return NULL; 3821 } 3822 3823 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 3824 { 3825 struct net *net = dev_net(dev); 3826 3827 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 3828 } 3829 3830 static void rtmsg_ifinfo_event(int type, struct net_device *dev, 3831 unsigned int change, u32 event, 3832 gfp_t flags, int *new_nsid, int new_ifindex) 3833 { 3834 struct sk_buff *skb; 3835 3836 if (dev->reg_state != NETREG_REGISTERED) 3837 return; 3838 3839 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid, 3840 new_ifindex); 3841 if (skb) 3842 rtmsg_ifinfo_send(skb, dev, flags); 3843 } 3844 3845 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 3846 gfp_t flags) 3847 { 3848 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 3849 NULL, 0); 3850 } 3851 3852 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 3853 gfp_t flags, int *new_nsid, int new_ifindex) 3854 { 3855 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 3856 new_nsid, new_ifindex); 3857 } 3858 3859 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 3860 struct net_device *dev, 3861 u8 *addr, u16 vid, u32 pid, u32 seq, 3862 int type, unsigned int flags, 3863 int nlflags, u16 ndm_state) 3864 { 3865 struct nlmsghdr *nlh; 3866 struct ndmsg *ndm; 3867 3868 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 3869 if (!nlh) 3870 return -EMSGSIZE; 3871 3872 ndm = nlmsg_data(nlh); 3873 ndm->ndm_family = AF_BRIDGE; 3874 ndm->ndm_pad1 = 0; 3875 ndm->ndm_pad2 = 0; 3876 ndm->ndm_flags = flags; 3877 ndm->ndm_type = 0; 3878 ndm->ndm_ifindex = dev->ifindex; 3879 ndm->ndm_state = ndm_state; 3880 3881 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 3882 goto nla_put_failure; 3883 if (vid) 3884 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 3885 goto nla_put_failure; 3886 3887 nlmsg_end(skb, nlh); 3888 return 0; 3889 3890 nla_put_failure: 3891 nlmsg_cancel(skb, nlh); 3892 return -EMSGSIZE; 3893 } 3894 3895 static inline size_t rtnl_fdb_nlmsg_size(void) 3896 { 3897 return NLMSG_ALIGN(sizeof(struct ndmsg)) + 3898 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */ 3899 nla_total_size(sizeof(u16)) + /* NDA_VLAN */ 3900 0; 3901 } 3902 3903 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 3904 u16 ndm_state) 3905 { 3906 struct net *net = dev_net(dev); 3907 struct sk_buff *skb; 3908 int err = -ENOBUFS; 3909 3910 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 3911 if (!skb) 3912 goto errout; 3913 3914 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 3915 0, 0, type, NTF_SELF, 0, ndm_state); 3916 if (err < 0) { 3917 kfree_skb(skb); 3918 goto errout; 3919 } 3920 3921 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 3922 return; 3923 errout: 3924 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 3925 } 3926 3927 /* 3928 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 3929 */ 3930 int ndo_dflt_fdb_add(struct ndmsg *ndm, 3931 struct nlattr *tb[], 3932 struct net_device *dev, 3933 const unsigned char *addr, u16 vid, 3934 u16 flags) 3935 { 3936 int err = -EINVAL; 3937 3938 /* If aging addresses are supported device will need to 3939 * implement its own handler for this. 3940 */ 3941 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 3942 pr_info("%s: FDB only supports static addresses\n", dev->name); 3943 return err; 3944 } 3945 3946 if (vid) { 3947 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 3948 return err; 3949 } 3950 3951 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 3952 err = dev_uc_add_excl(dev, addr); 3953 else if (is_multicast_ether_addr(addr)) 3954 err = dev_mc_add_excl(dev, addr); 3955 3956 /* Only return duplicate errors if NLM_F_EXCL is set */ 3957 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 3958 err = 0; 3959 3960 return err; 3961 } 3962 EXPORT_SYMBOL(ndo_dflt_fdb_add); 3963 3964 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid, 3965 struct netlink_ext_ack *extack) 3966 { 3967 u16 vid = 0; 3968 3969 if (vlan_attr) { 3970 if (nla_len(vlan_attr) != sizeof(u16)) { 3971 NL_SET_ERR_MSG(extack, "invalid vlan attribute size"); 3972 return -EINVAL; 3973 } 3974 3975 vid = nla_get_u16(vlan_attr); 3976 3977 if (!vid || vid >= VLAN_VID_MASK) { 3978 NL_SET_ERR_MSG(extack, "invalid vlan id"); 3979 return -EINVAL; 3980 } 3981 } 3982 *p_vid = vid; 3983 return 0; 3984 } 3985 3986 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, 3987 struct netlink_ext_ack *extack) 3988 { 3989 struct net *net = sock_net(skb->sk); 3990 struct ndmsg *ndm; 3991 struct nlattr *tb[NDA_MAX+1]; 3992 struct net_device *dev; 3993 u8 *addr; 3994 u16 vid; 3995 int err; 3996 3997 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, 3998 extack); 3999 if (err < 0) 4000 return err; 4001 4002 ndm = nlmsg_data(nlh); 4003 if (ndm->ndm_ifindex == 0) { 4004 NL_SET_ERR_MSG(extack, "invalid ifindex"); 4005 return -EINVAL; 4006 } 4007 4008 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 4009 if (dev == NULL) { 4010 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4011 return -ENODEV; 4012 } 4013 4014 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 4015 NL_SET_ERR_MSG(extack, "invalid address"); 4016 return -EINVAL; 4017 } 4018 4019 if (dev->type != ARPHRD_ETHER) { 4020 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices"); 4021 return -EINVAL; 4022 } 4023 4024 addr = nla_data(tb[NDA_LLADDR]); 4025 4026 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 4027 if (err) 4028 return err; 4029 4030 err = -EOPNOTSUPP; 4031 4032 /* Support fdb on master device the net/bridge default case */ 4033 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 4034 netif_is_bridge_port(dev)) { 4035 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4036 const struct net_device_ops *ops = br_dev->netdev_ops; 4037 4038 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 4039 nlh->nlmsg_flags, extack); 4040 if (err) 4041 goto out; 4042 else 4043 ndm->ndm_flags &= ~NTF_MASTER; 4044 } 4045 4046 /* Embedded bridge, macvlan, and any other device support */ 4047 if ((ndm->ndm_flags & NTF_SELF)) { 4048 if (dev->netdev_ops->ndo_fdb_add) 4049 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 4050 vid, 4051 nlh->nlmsg_flags, 4052 extack); 4053 else 4054 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 4055 nlh->nlmsg_flags); 4056 4057 if (!err) { 4058 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 4059 ndm->ndm_state); 4060 ndm->ndm_flags &= ~NTF_SELF; 4061 } 4062 } 4063 out: 4064 return err; 4065 } 4066 4067 /* 4068 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 4069 */ 4070 int ndo_dflt_fdb_del(struct ndmsg *ndm, 4071 struct nlattr *tb[], 4072 struct net_device *dev, 4073 const unsigned char *addr, u16 vid) 4074 { 4075 int err = -EINVAL; 4076 4077 /* If aging addresses are supported device will need to 4078 * implement its own handler for this. 4079 */ 4080 if (!(ndm->ndm_state & NUD_PERMANENT)) { 4081 pr_info("%s: FDB only supports static addresses\n", dev->name); 4082 return err; 4083 } 4084 4085 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 4086 err = dev_uc_del(dev, addr); 4087 else if (is_multicast_ether_addr(addr)) 4088 err = dev_mc_del(dev, addr); 4089 4090 return err; 4091 } 4092 EXPORT_SYMBOL(ndo_dflt_fdb_del); 4093 4094 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, 4095 struct netlink_ext_ack *extack) 4096 { 4097 struct net *net = sock_net(skb->sk); 4098 struct ndmsg *ndm; 4099 struct nlattr *tb[NDA_MAX+1]; 4100 struct net_device *dev; 4101 __u8 *addr; 4102 int err; 4103 u16 vid; 4104 4105 if (!netlink_capable(skb, CAP_NET_ADMIN)) 4106 return -EPERM; 4107 4108 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, 4109 extack); 4110 if (err < 0) 4111 return err; 4112 4113 ndm = nlmsg_data(nlh); 4114 if (ndm->ndm_ifindex == 0) { 4115 NL_SET_ERR_MSG(extack, "invalid ifindex"); 4116 return -EINVAL; 4117 } 4118 4119 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 4120 if (dev == NULL) { 4121 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4122 return -ENODEV; 4123 } 4124 4125 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 4126 NL_SET_ERR_MSG(extack, "invalid address"); 4127 return -EINVAL; 4128 } 4129 4130 if (dev->type != ARPHRD_ETHER) { 4131 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices"); 4132 return -EINVAL; 4133 } 4134 4135 addr = nla_data(tb[NDA_LLADDR]); 4136 4137 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 4138 if (err) 4139 return err; 4140 4141 err = -EOPNOTSUPP; 4142 4143 /* Support fdb on master device the net/bridge default case */ 4144 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 4145 netif_is_bridge_port(dev)) { 4146 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4147 const struct net_device_ops *ops = br_dev->netdev_ops; 4148 4149 if (ops->ndo_fdb_del) 4150 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 4151 4152 if (err) 4153 goto out; 4154 else 4155 ndm->ndm_flags &= ~NTF_MASTER; 4156 } 4157 4158 /* Embedded bridge, macvlan, and any other device support */ 4159 if (ndm->ndm_flags & NTF_SELF) { 4160 if (dev->netdev_ops->ndo_fdb_del) 4161 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 4162 vid); 4163 else 4164 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 4165 4166 if (!err) { 4167 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 4168 ndm->ndm_state); 4169 ndm->ndm_flags &= ~NTF_SELF; 4170 } 4171 } 4172 out: 4173 return err; 4174 } 4175 4176 static int nlmsg_populate_fdb(struct sk_buff *skb, 4177 struct netlink_callback *cb, 4178 struct net_device *dev, 4179 int *idx, 4180 struct netdev_hw_addr_list *list) 4181 { 4182 struct netdev_hw_addr *ha; 4183 int err; 4184 u32 portid, seq; 4185 4186 portid = NETLINK_CB(cb->skb).portid; 4187 seq = cb->nlh->nlmsg_seq; 4188 4189 list_for_each_entry(ha, &list->list, list) { 4190 if (*idx < cb->args[2]) 4191 goto skip; 4192 4193 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 4194 portid, seq, 4195 RTM_NEWNEIGH, NTF_SELF, 4196 NLM_F_MULTI, NUD_PERMANENT); 4197 if (err < 0) 4198 return err; 4199 skip: 4200 *idx += 1; 4201 } 4202 return 0; 4203 } 4204 4205 /** 4206 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 4207 * @skb: socket buffer to store message in 4208 * @cb: netlink callback 4209 * @dev: netdevice 4210 * @filter_dev: ignored 4211 * @idx: the number of FDB table entries dumped is added to *@idx 4212 * 4213 * Default netdevice operation to dump the existing unicast address list. 4214 * Returns number of addresses from list put in skb. 4215 */ 4216 int ndo_dflt_fdb_dump(struct sk_buff *skb, 4217 struct netlink_callback *cb, 4218 struct net_device *dev, 4219 struct net_device *filter_dev, 4220 int *idx) 4221 { 4222 int err; 4223 4224 if (dev->type != ARPHRD_ETHER) 4225 return -EINVAL; 4226 4227 netif_addr_lock_bh(dev); 4228 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc); 4229 if (err) 4230 goto out; 4231 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc); 4232 out: 4233 netif_addr_unlock_bh(dev); 4234 return err; 4235 } 4236 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 4237 4238 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh, 4239 int *br_idx, int *brport_idx, 4240 struct netlink_ext_ack *extack) 4241 { 4242 struct nlattr *tb[NDA_MAX + 1]; 4243 struct ndmsg *ndm; 4244 int err, i; 4245 4246 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { 4247 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request"); 4248 return -EINVAL; 4249 } 4250 4251 ndm = nlmsg_data(nlh); 4252 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || 4253 ndm->ndm_flags || ndm->ndm_type) { 4254 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request"); 4255 return -EINVAL; 4256 } 4257 4258 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, 4259 NDA_MAX, NULL, extack); 4260 if (err < 0) 4261 return err; 4262 4263 *brport_idx = ndm->ndm_ifindex; 4264 for (i = 0; i <= NDA_MAX; ++i) { 4265 if (!tb[i]) 4266 continue; 4267 4268 switch (i) { 4269 case NDA_IFINDEX: 4270 if (nla_len(tb[i]) != sizeof(u32)) { 4271 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request"); 4272 return -EINVAL; 4273 } 4274 *brport_idx = nla_get_u32(tb[NDA_IFINDEX]); 4275 break; 4276 case NDA_MASTER: 4277 if (nla_len(tb[i]) != sizeof(u32)) { 4278 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request"); 4279 return -EINVAL; 4280 } 4281 *br_idx = nla_get_u32(tb[NDA_MASTER]); 4282 break; 4283 default: 4284 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request"); 4285 return -EINVAL; 4286 } 4287 } 4288 4289 return 0; 4290 } 4291 4292 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh, 4293 int *br_idx, int *brport_idx, 4294 struct netlink_ext_ack *extack) 4295 { 4296 struct nlattr *tb[IFLA_MAX+1]; 4297 int err; 4298 4299 /* A hack to preserve kernel<->userspace interface. 4300 * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0. 4301 * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails. 4302 * So, check for ndmsg with an optional u32 attribute (not used here). 4303 * Fortunately these sizes don't conflict with the size of ifinfomsg 4304 * with an optional attribute. 4305 */ 4306 if (nlmsg_len(nlh) != sizeof(struct ndmsg) && 4307 (nlmsg_len(nlh) != sizeof(struct ndmsg) + 4308 nla_attr_size(sizeof(u32)))) { 4309 struct ifinfomsg *ifm; 4310 4311 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg), 4312 tb, IFLA_MAX, ifla_policy, 4313 extack); 4314 if (err < 0) { 4315 return -EINVAL; 4316 } else if (err == 0) { 4317 if (tb[IFLA_MASTER]) 4318 *br_idx = nla_get_u32(tb[IFLA_MASTER]); 4319 } 4320 4321 ifm = nlmsg_data(nlh); 4322 *brport_idx = ifm->ifi_index; 4323 } 4324 return 0; 4325 } 4326 4327 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 4328 { 4329 struct net_device *dev; 4330 struct net_device *br_dev = NULL; 4331 const struct net_device_ops *ops = NULL; 4332 const struct net_device_ops *cops = NULL; 4333 struct net *net = sock_net(skb->sk); 4334 struct hlist_head *head; 4335 int brport_idx = 0; 4336 int br_idx = 0; 4337 int h, s_h; 4338 int idx = 0, s_idx; 4339 int err = 0; 4340 int fidx = 0; 4341 4342 if (cb->strict_check) 4343 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx, 4344 cb->extack); 4345 else 4346 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx, 4347 cb->extack); 4348 if (err < 0) 4349 return err; 4350 4351 if (br_idx) { 4352 br_dev = __dev_get_by_index(net, br_idx); 4353 if (!br_dev) 4354 return -ENODEV; 4355 4356 ops = br_dev->netdev_ops; 4357 } 4358 4359 s_h = cb->args[0]; 4360 s_idx = cb->args[1]; 4361 4362 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4363 idx = 0; 4364 head = &net->dev_index_head[h]; 4365 hlist_for_each_entry(dev, head, index_hlist) { 4366 4367 if (brport_idx && (dev->ifindex != brport_idx)) 4368 continue; 4369 4370 if (!br_idx) { /* user did not specify a specific bridge */ 4371 if (netif_is_bridge_port(dev)) { 4372 br_dev = netdev_master_upper_dev_get(dev); 4373 cops = br_dev->netdev_ops; 4374 } 4375 } else { 4376 if (dev != br_dev && 4377 !netif_is_bridge_port(dev)) 4378 continue; 4379 4380 if (br_dev != netdev_master_upper_dev_get(dev) && 4381 !(dev->priv_flags & IFF_EBRIDGE)) 4382 continue; 4383 cops = ops; 4384 } 4385 4386 if (idx < s_idx) 4387 goto cont; 4388 4389 if (netif_is_bridge_port(dev)) { 4390 if (cops && cops->ndo_fdb_dump) { 4391 err = cops->ndo_fdb_dump(skb, cb, 4392 br_dev, dev, 4393 &fidx); 4394 if (err == -EMSGSIZE) 4395 goto out; 4396 } 4397 } 4398 4399 if (dev->netdev_ops->ndo_fdb_dump) 4400 err = dev->netdev_ops->ndo_fdb_dump(skb, cb, 4401 dev, NULL, 4402 &fidx); 4403 else 4404 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, 4405 &fidx); 4406 if (err == -EMSGSIZE) 4407 goto out; 4408 4409 cops = NULL; 4410 4411 /* reset fdb offset to 0 for rest of the interfaces */ 4412 cb->args[2] = 0; 4413 fidx = 0; 4414 cont: 4415 idx++; 4416 } 4417 } 4418 4419 out: 4420 cb->args[0] = h; 4421 cb->args[1] = idx; 4422 cb->args[2] = fidx; 4423 4424 return skb->len; 4425 } 4426 4427 static int valid_fdb_get_strict(const struct nlmsghdr *nlh, 4428 struct nlattr **tb, u8 *ndm_flags, 4429 int *br_idx, int *brport_idx, u8 **addr, 4430 u16 *vid, struct netlink_ext_ack *extack) 4431 { 4432 struct ndmsg *ndm; 4433 int err, i; 4434 4435 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { 4436 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request"); 4437 return -EINVAL; 4438 } 4439 4440 ndm = nlmsg_data(nlh); 4441 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || 4442 ndm->ndm_type) { 4443 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request"); 4444 return -EINVAL; 4445 } 4446 4447 if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) { 4448 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request"); 4449 return -EINVAL; 4450 } 4451 4452 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, 4453 NDA_MAX, nda_policy, extack); 4454 if (err < 0) 4455 return err; 4456 4457 *ndm_flags = ndm->ndm_flags; 4458 *brport_idx = ndm->ndm_ifindex; 4459 for (i = 0; i <= NDA_MAX; ++i) { 4460 if (!tb[i]) 4461 continue; 4462 4463 switch (i) { 4464 case NDA_MASTER: 4465 *br_idx = nla_get_u32(tb[i]); 4466 break; 4467 case NDA_LLADDR: 4468 if (nla_len(tb[i]) != ETH_ALEN) { 4469 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request"); 4470 return -EINVAL; 4471 } 4472 *addr = nla_data(tb[i]); 4473 break; 4474 case NDA_VLAN: 4475 err = fdb_vid_parse(tb[i], vid, extack); 4476 if (err) 4477 return err; 4478 break; 4479 case NDA_VNI: 4480 break; 4481 default: 4482 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request"); 4483 return -EINVAL; 4484 } 4485 } 4486 4487 return 0; 4488 } 4489 4490 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4491 struct netlink_ext_ack *extack) 4492 { 4493 struct net_device *dev = NULL, *br_dev = NULL; 4494 const struct net_device_ops *ops = NULL; 4495 struct net *net = sock_net(in_skb->sk); 4496 struct nlattr *tb[NDA_MAX + 1]; 4497 struct sk_buff *skb; 4498 int brport_idx = 0; 4499 u8 ndm_flags = 0; 4500 int br_idx = 0; 4501 u8 *addr = NULL; 4502 u16 vid = 0; 4503 int err; 4504 4505 err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx, 4506 &brport_idx, &addr, &vid, extack); 4507 if (err < 0) 4508 return err; 4509 4510 if (!addr) { 4511 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request"); 4512 return -EINVAL; 4513 } 4514 4515 if (brport_idx) { 4516 dev = __dev_get_by_index(net, brport_idx); 4517 if (!dev) { 4518 NL_SET_ERR_MSG(extack, "Unknown device ifindex"); 4519 return -ENODEV; 4520 } 4521 } 4522 4523 if (br_idx) { 4524 if (dev) { 4525 NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive"); 4526 return -EINVAL; 4527 } 4528 4529 br_dev = __dev_get_by_index(net, br_idx); 4530 if (!br_dev) { 4531 NL_SET_ERR_MSG(extack, "Invalid master ifindex"); 4532 return -EINVAL; 4533 } 4534 ops = br_dev->netdev_ops; 4535 } 4536 4537 if (dev) { 4538 if (!ndm_flags || (ndm_flags & NTF_MASTER)) { 4539 if (!netif_is_bridge_port(dev)) { 4540 NL_SET_ERR_MSG(extack, "Device is not a bridge port"); 4541 return -EINVAL; 4542 } 4543 br_dev = netdev_master_upper_dev_get(dev); 4544 if (!br_dev) { 4545 NL_SET_ERR_MSG(extack, "Master of device not found"); 4546 return -EINVAL; 4547 } 4548 ops = br_dev->netdev_ops; 4549 } else { 4550 if (!(ndm_flags & NTF_SELF)) { 4551 NL_SET_ERR_MSG(extack, "Missing NTF_SELF"); 4552 return -EINVAL; 4553 } 4554 ops = dev->netdev_ops; 4555 } 4556 } 4557 4558 if (!br_dev && !dev) { 4559 NL_SET_ERR_MSG(extack, "No device specified"); 4560 return -ENODEV; 4561 } 4562 4563 if (!ops || !ops->ndo_fdb_get) { 4564 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device"); 4565 return -EOPNOTSUPP; 4566 } 4567 4568 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 4569 if (!skb) 4570 return -ENOBUFS; 4571 4572 if (br_dev) 4573 dev = br_dev; 4574 err = ops->ndo_fdb_get(skb, tb, dev, addr, vid, 4575 NETLINK_CB(in_skb).portid, 4576 nlh->nlmsg_seq, extack); 4577 if (err) 4578 goto out; 4579 4580 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4581 out: 4582 kfree_skb(skb); 4583 return err; 4584 } 4585 4586 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 4587 unsigned int attrnum, unsigned int flag) 4588 { 4589 if (mask & flag) 4590 return nla_put_u8(skb, attrnum, !!(flags & flag)); 4591 return 0; 4592 } 4593 4594 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 4595 struct net_device *dev, u16 mode, 4596 u32 flags, u32 mask, int nlflags, 4597 u32 filter_mask, 4598 int (*vlan_fill)(struct sk_buff *skb, 4599 struct net_device *dev, 4600 u32 filter_mask)) 4601 { 4602 struct nlmsghdr *nlh; 4603 struct ifinfomsg *ifm; 4604 struct nlattr *br_afspec; 4605 struct nlattr *protinfo; 4606 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 4607 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4608 int err = 0; 4609 4610 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 4611 if (nlh == NULL) 4612 return -EMSGSIZE; 4613 4614 ifm = nlmsg_data(nlh); 4615 ifm->ifi_family = AF_BRIDGE; 4616 ifm->__ifi_pad = 0; 4617 ifm->ifi_type = dev->type; 4618 ifm->ifi_index = dev->ifindex; 4619 ifm->ifi_flags = dev_get_flags(dev); 4620 ifm->ifi_change = 0; 4621 4622 4623 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4624 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4625 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 4626 (br_dev && 4627 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 4628 (dev->addr_len && 4629 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4630 (dev->ifindex != dev_get_iflink(dev) && 4631 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 4632 goto nla_put_failure; 4633 4634 br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC); 4635 if (!br_afspec) 4636 goto nla_put_failure; 4637 4638 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 4639 nla_nest_cancel(skb, br_afspec); 4640 goto nla_put_failure; 4641 } 4642 4643 if (mode != BRIDGE_MODE_UNDEF) { 4644 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 4645 nla_nest_cancel(skb, br_afspec); 4646 goto nla_put_failure; 4647 } 4648 } 4649 if (vlan_fill) { 4650 err = vlan_fill(skb, dev, filter_mask); 4651 if (err) { 4652 nla_nest_cancel(skb, br_afspec); 4653 goto nla_put_failure; 4654 } 4655 } 4656 nla_nest_end(skb, br_afspec); 4657 4658 protinfo = nla_nest_start(skb, IFLA_PROTINFO); 4659 if (!protinfo) 4660 goto nla_put_failure; 4661 4662 if (brport_nla_put_flag(skb, flags, mask, 4663 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 4664 brport_nla_put_flag(skb, flags, mask, 4665 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 4666 brport_nla_put_flag(skb, flags, mask, 4667 IFLA_BRPORT_FAST_LEAVE, 4668 BR_MULTICAST_FAST_LEAVE) || 4669 brport_nla_put_flag(skb, flags, mask, 4670 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 4671 brport_nla_put_flag(skb, flags, mask, 4672 IFLA_BRPORT_LEARNING, BR_LEARNING) || 4673 brport_nla_put_flag(skb, flags, mask, 4674 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 4675 brport_nla_put_flag(skb, flags, mask, 4676 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 4677 brport_nla_put_flag(skb, flags, mask, 4678 IFLA_BRPORT_PROXYARP, BR_PROXYARP) || 4679 brport_nla_put_flag(skb, flags, mask, 4680 IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) || 4681 brport_nla_put_flag(skb, flags, mask, 4682 IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) { 4683 nla_nest_cancel(skb, protinfo); 4684 goto nla_put_failure; 4685 } 4686 4687 nla_nest_end(skb, protinfo); 4688 4689 nlmsg_end(skb, nlh); 4690 return 0; 4691 nla_put_failure: 4692 nlmsg_cancel(skb, nlh); 4693 return err ? err : -EMSGSIZE; 4694 } 4695 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 4696 4697 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh, 4698 bool strict_check, u32 *filter_mask, 4699 struct netlink_ext_ack *extack) 4700 { 4701 struct nlattr *tb[IFLA_MAX+1]; 4702 int err, i; 4703 4704 if (strict_check) { 4705 struct ifinfomsg *ifm; 4706 4707 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 4708 NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump"); 4709 return -EINVAL; 4710 } 4711 4712 ifm = nlmsg_data(nlh); 4713 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 4714 ifm->ifi_change || ifm->ifi_index) { 4715 NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request"); 4716 return -EINVAL; 4717 } 4718 4719 err = nlmsg_parse_deprecated_strict(nlh, 4720 sizeof(struct ifinfomsg), 4721 tb, IFLA_MAX, ifla_policy, 4722 extack); 4723 } else { 4724 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg), 4725 tb, IFLA_MAX, ifla_policy, 4726 extack); 4727 } 4728 if (err < 0) 4729 return err; 4730 4731 /* new attributes should only be added with strict checking */ 4732 for (i = 0; i <= IFLA_MAX; ++i) { 4733 if (!tb[i]) 4734 continue; 4735 4736 switch (i) { 4737 case IFLA_EXT_MASK: 4738 *filter_mask = nla_get_u32(tb[i]); 4739 break; 4740 default: 4741 if (strict_check) { 4742 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request"); 4743 return -EINVAL; 4744 } 4745 } 4746 } 4747 4748 return 0; 4749 } 4750 4751 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 4752 { 4753 const struct nlmsghdr *nlh = cb->nlh; 4754 struct net *net = sock_net(skb->sk); 4755 struct net_device *dev; 4756 int idx = 0; 4757 u32 portid = NETLINK_CB(cb->skb).portid; 4758 u32 seq = nlh->nlmsg_seq; 4759 u32 filter_mask = 0; 4760 int err; 4761 4762 err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask, 4763 cb->extack); 4764 if (err < 0 && cb->strict_check) 4765 return err; 4766 4767 rcu_read_lock(); 4768 for_each_netdev_rcu(net, dev) { 4769 const struct net_device_ops *ops = dev->netdev_ops; 4770 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4771 4772 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 4773 if (idx >= cb->args[0]) { 4774 err = br_dev->netdev_ops->ndo_bridge_getlink( 4775 skb, portid, seq, dev, 4776 filter_mask, NLM_F_MULTI); 4777 if (err < 0 && err != -EOPNOTSUPP) { 4778 if (likely(skb->len)) 4779 break; 4780 4781 goto out_err; 4782 } 4783 } 4784 idx++; 4785 } 4786 4787 if (ops->ndo_bridge_getlink) { 4788 if (idx >= cb->args[0]) { 4789 err = ops->ndo_bridge_getlink(skb, portid, 4790 seq, dev, 4791 filter_mask, 4792 NLM_F_MULTI); 4793 if (err < 0 && err != -EOPNOTSUPP) { 4794 if (likely(skb->len)) 4795 break; 4796 4797 goto out_err; 4798 } 4799 } 4800 idx++; 4801 } 4802 } 4803 err = skb->len; 4804 out_err: 4805 rcu_read_unlock(); 4806 cb->args[0] = idx; 4807 4808 return err; 4809 } 4810 4811 static inline size_t bridge_nlmsg_size(void) 4812 { 4813 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4814 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4815 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4816 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 4817 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 4818 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 4819 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 4820 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 4821 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 4822 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 4823 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 4824 } 4825 4826 static int rtnl_bridge_notify(struct net_device *dev) 4827 { 4828 struct net *net = dev_net(dev); 4829 struct sk_buff *skb; 4830 int err = -EOPNOTSUPP; 4831 4832 if (!dev->netdev_ops->ndo_bridge_getlink) 4833 return 0; 4834 4835 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 4836 if (!skb) { 4837 err = -ENOMEM; 4838 goto errout; 4839 } 4840 4841 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 4842 if (err < 0) 4843 goto errout; 4844 4845 if (!skb->len) 4846 goto errout; 4847 4848 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 4849 return 0; 4850 errout: 4851 WARN_ON(err == -EMSGSIZE); 4852 kfree_skb(skb); 4853 if (err) 4854 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 4855 return err; 4856 } 4857 4858 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 4859 struct netlink_ext_ack *extack) 4860 { 4861 struct net *net = sock_net(skb->sk); 4862 struct ifinfomsg *ifm; 4863 struct net_device *dev; 4864 struct nlattr *br_spec, *attr = NULL; 4865 int rem, err = -EOPNOTSUPP; 4866 u16 flags = 0; 4867 bool have_flags = false; 4868 4869 if (nlmsg_len(nlh) < sizeof(*ifm)) 4870 return -EINVAL; 4871 4872 ifm = nlmsg_data(nlh); 4873 if (ifm->ifi_family != AF_BRIDGE) 4874 return -EPFNOSUPPORT; 4875 4876 dev = __dev_get_by_index(net, ifm->ifi_index); 4877 if (!dev) { 4878 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4879 return -ENODEV; 4880 } 4881 4882 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 4883 if (br_spec) { 4884 nla_for_each_nested(attr, br_spec, rem) { 4885 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 4886 if (nla_len(attr) < sizeof(flags)) 4887 return -EINVAL; 4888 4889 have_flags = true; 4890 flags = nla_get_u16(attr); 4891 break; 4892 } 4893 } 4894 } 4895 4896 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 4897 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4898 4899 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 4900 err = -EOPNOTSUPP; 4901 goto out; 4902 } 4903 4904 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags, 4905 extack); 4906 if (err) 4907 goto out; 4908 4909 flags &= ~BRIDGE_FLAGS_MASTER; 4910 } 4911 4912 if ((flags & BRIDGE_FLAGS_SELF)) { 4913 if (!dev->netdev_ops->ndo_bridge_setlink) 4914 err = -EOPNOTSUPP; 4915 else 4916 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 4917 flags, 4918 extack); 4919 if (!err) { 4920 flags &= ~BRIDGE_FLAGS_SELF; 4921 4922 /* Generate event to notify upper layer of bridge 4923 * change 4924 */ 4925 err = rtnl_bridge_notify(dev); 4926 } 4927 } 4928 4929 if (have_flags) 4930 memcpy(nla_data(attr), &flags, sizeof(flags)); 4931 out: 4932 return err; 4933 } 4934 4935 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 4936 struct netlink_ext_ack *extack) 4937 { 4938 struct net *net = sock_net(skb->sk); 4939 struct ifinfomsg *ifm; 4940 struct net_device *dev; 4941 struct nlattr *br_spec, *attr = NULL; 4942 int rem, err = -EOPNOTSUPP; 4943 u16 flags = 0; 4944 bool have_flags = false; 4945 4946 if (nlmsg_len(nlh) < sizeof(*ifm)) 4947 return -EINVAL; 4948 4949 ifm = nlmsg_data(nlh); 4950 if (ifm->ifi_family != AF_BRIDGE) 4951 return -EPFNOSUPPORT; 4952 4953 dev = __dev_get_by_index(net, ifm->ifi_index); 4954 if (!dev) { 4955 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4956 return -ENODEV; 4957 } 4958 4959 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 4960 if (br_spec) { 4961 nla_for_each_nested(attr, br_spec, rem) { 4962 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 4963 if (nla_len(attr) < sizeof(flags)) 4964 return -EINVAL; 4965 4966 have_flags = true; 4967 flags = nla_get_u16(attr); 4968 break; 4969 } 4970 } 4971 } 4972 4973 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 4974 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4975 4976 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 4977 err = -EOPNOTSUPP; 4978 goto out; 4979 } 4980 4981 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 4982 if (err) 4983 goto out; 4984 4985 flags &= ~BRIDGE_FLAGS_MASTER; 4986 } 4987 4988 if ((flags & BRIDGE_FLAGS_SELF)) { 4989 if (!dev->netdev_ops->ndo_bridge_dellink) 4990 err = -EOPNOTSUPP; 4991 else 4992 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 4993 flags); 4994 4995 if (!err) { 4996 flags &= ~BRIDGE_FLAGS_SELF; 4997 4998 /* Generate event to notify upper layer of bridge 4999 * change 5000 */ 5001 err = rtnl_bridge_notify(dev); 5002 } 5003 } 5004 5005 if (have_flags) 5006 memcpy(nla_data(attr), &flags, sizeof(flags)); 5007 out: 5008 return err; 5009 } 5010 5011 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr) 5012 { 5013 return (mask & IFLA_STATS_FILTER_BIT(attrid)) && 5014 (!idxattr || idxattr == attrid); 5015 } 5016 5017 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1) 5018 static int rtnl_get_offload_stats_attr_size(int attr_id) 5019 { 5020 switch (attr_id) { 5021 case IFLA_OFFLOAD_XSTATS_CPU_HIT: 5022 return sizeof(struct rtnl_link_stats64); 5023 } 5024 5025 return 0; 5026 } 5027 5028 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev, 5029 int *prividx) 5030 { 5031 struct nlattr *attr = NULL; 5032 int attr_id, size; 5033 void *attr_data; 5034 int err; 5035 5036 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 5037 dev->netdev_ops->ndo_get_offload_stats)) 5038 return -ENODATA; 5039 5040 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 5041 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 5042 if (attr_id < *prividx) 5043 continue; 5044 5045 size = rtnl_get_offload_stats_attr_size(attr_id); 5046 if (!size) 5047 continue; 5048 5049 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 5050 continue; 5051 5052 attr = nla_reserve_64bit(skb, attr_id, size, 5053 IFLA_OFFLOAD_XSTATS_UNSPEC); 5054 if (!attr) 5055 goto nla_put_failure; 5056 5057 attr_data = nla_data(attr); 5058 memset(attr_data, 0, size); 5059 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, 5060 attr_data); 5061 if (err) 5062 goto get_offload_stats_failure; 5063 } 5064 5065 if (!attr) 5066 return -ENODATA; 5067 5068 *prividx = 0; 5069 return 0; 5070 5071 nla_put_failure: 5072 err = -EMSGSIZE; 5073 get_offload_stats_failure: 5074 *prividx = attr_id; 5075 return err; 5076 } 5077 5078 static int rtnl_get_offload_stats_size(const struct net_device *dev) 5079 { 5080 int nla_size = 0; 5081 int attr_id; 5082 int size; 5083 5084 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 5085 dev->netdev_ops->ndo_get_offload_stats)) 5086 return 0; 5087 5088 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 5089 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 5090 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 5091 continue; 5092 size = rtnl_get_offload_stats_attr_size(attr_id); 5093 nla_size += nla_total_size_64bit(size); 5094 } 5095 5096 if (nla_size != 0) 5097 nla_size += nla_total_size(0); 5098 5099 return nla_size; 5100 } 5101 5102 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, 5103 int type, u32 pid, u32 seq, u32 change, 5104 unsigned int flags, unsigned int filter_mask, 5105 int *idxattr, int *prividx) 5106 { 5107 struct if_stats_msg *ifsm; 5108 struct nlmsghdr *nlh; 5109 struct nlattr *attr; 5110 int s_prividx = *prividx; 5111 int err; 5112 5113 ASSERT_RTNL(); 5114 5115 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags); 5116 if (!nlh) 5117 return -EMSGSIZE; 5118 5119 ifsm = nlmsg_data(nlh); 5120 ifsm->family = PF_UNSPEC; 5121 ifsm->pad1 = 0; 5122 ifsm->pad2 = 0; 5123 ifsm->ifindex = dev->ifindex; 5124 ifsm->filter_mask = filter_mask; 5125 5126 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) { 5127 struct rtnl_link_stats64 *sp; 5128 5129 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64, 5130 sizeof(struct rtnl_link_stats64), 5131 IFLA_STATS_UNSPEC); 5132 if (!attr) 5133 goto nla_put_failure; 5134 5135 sp = nla_data(attr); 5136 dev_get_stats(dev, sp); 5137 } 5138 5139 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) { 5140 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 5141 5142 if (ops && ops->fill_linkxstats) { 5143 *idxattr = IFLA_STATS_LINK_XSTATS; 5144 attr = nla_nest_start_noflag(skb, 5145 IFLA_STATS_LINK_XSTATS); 5146 if (!attr) 5147 goto nla_put_failure; 5148 5149 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 5150 nla_nest_end(skb, attr); 5151 if (err) 5152 goto nla_put_failure; 5153 *idxattr = 0; 5154 } 5155 } 5156 5157 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 5158 *idxattr)) { 5159 const struct rtnl_link_ops *ops = NULL; 5160 const struct net_device *master; 5161 5162 master = netdev_master_upper_dev_get(dev); 5163 if (master) 5164 ops = master->rtnl_link_ops; 5165 if (ops && ops->fill_linkxstats) { 5166 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE; 5167 attr = nla_nest_start_noflag(skb, 5168 IFLA_STATS_LINK_XSTATS_SLAVE); 5169 if (!attr) 5170 goto nla_put_failure; 5171 5172 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 5173 nla_nest_end(skb, attr); 5174 if (err) 5175 goto nla_put_failure; 5176 *idxattr = 0; 5177 } 5178 } 5179 5180 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 5181 *idxattr)) { 5182 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS; 5183 attr = nla_nest_start_noflag(skb, 5184 IFLA_STATS_LINK_OFFLOAD_XSTATS); 5185 if (!attr) 5186 goto nla_put_failure; 5187 5188 err = rtnl_get_offload_stats(skb, dev, prividx); 5189 if (err == -ENODATA) 5190 nla_nest_cancel(skb, attr); 5191 else 5192 nla_nest_end(skb, attr); 5193 5194 if (err && err != -ENODATA) 5195 goto nla_put_failure; 5196 *idxattr = 0; 5197 } 5198 5199 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) { 5200 struct rtnl_af_ops *af_ops; 5201 5202 *idxattr = IFLA_STATS_AF_SPEC; 5203 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC); 5204 if (!attr) 5205 goto nla_put_failure; 5206 5207 rcu_read_lock(); 5208 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 5209 if (af_ops->fill_stats_af) { 5210 struct nlattr *af; 5211 int err; 5212 5213 af = nla_nest_start_noflag(skb, 5214 af_ops->family); 5215 if (!af) { 5216 rcu_read_unlock(); 5217 goto nla_put_failure; 5218 } 5219 err = af_ops->fill_stats_af(skb, dev); 5220 5221 if (err == -ENODATA) { 5222 nla_nest_cancel(skb, af); 5223 } else if (err < 0) { 5224 rcu_read_unlock(); 5225 goto nla_put_failure; 5226 } 5227 5228 nla_nest_end(skb, af); 5229 } 5230 } 5231 rcu_read_unlock(); 5232 5233 nla_nest_end(skb, attr); 5234 5235 *idxattr = 0; 5236 } 5237 5238 nlmsg_end(skb, nlh); 5239 5240 return 0; 5241 5242 nla_put_failure: 5243 /* not a multi message or no progress mean a real error */ 5244 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx) 5245 nlmsg_cancel(skb, nlh); 5246 else 5247 nlmsg_end(skb, nlh); 5248 5249 return -EMSGSIZE; 5250 } 5251 5252 static size_t if_nlmsg_stats_size(const struct net_device *dev, 5253 u32 filter_mask) 5254 { 5255 size_t size = 0; 5256 5257 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0)) 5258 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64)); 5259 5260 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) { 5261 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 5262 int attr = IFLA_STATS_LINK_XSTATS; 5263 5264 if (ops && ops->get_linkxstats_size) { 5265 size += nla_total_size(ops->get_linkxstats_size(dev, 5266 attr)); 5267 /* for IFLA_STATS_LINK_XSTATS */ 5268 size += nla_total_size(0); 5269 } 5270 } 5271 5272 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) { 5273 struct net_device *_dev = (struct net_device *)dev; 5274 const struct rtnl_link_ops *ops = NULL; 5275 const struct net_device *master; 5276 5277 /* netdev_master_upper_dev_get can't take const */ 5278 master = netdev_master_upper_dev_get(_dev); 5279 if (master) 5280 ops = master->rtnl_link_ops; 5281 if (ops && ops->get_linkxstats_size) { 5282 int attr = IFLA_STATS_LINK_XSTATS_SLAVE; 5283 5284 size += nla_total_size(ops->get_linkxstats_size(dev, 5285 attr)); 5286 /* for IFLA_STATS_LINK_XSTATS_SLAVE */ 5287 size += nla_total_size(0); 5288 } 5289 } 5290 5291 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) 5292 size += rtnl_get_offload_stats_size(dev); 5293 5294 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) { 5295 struct rtnl_af_ops *af_ops; 5296 5297 /* for IFLA_STATS_AF_SPEC */ 5298 size += nla_total_size(0); 5299 5300 rcu_read_lock(); 5301 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 5302 if (af_ops->get_stats_af_size) { 5303 size += nla_total_size( 5304 af_ops->get_stats_af_size(dev)); 5305 5306 /* for AF_* */ 5307 size += nla_total_size(0); 5308 } 5309 } 5310 rcu_read_unlock(); 5311 } 5312 5313 return size; 5314 } 5315 5316 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check, 5317 bool is_dump, struct netlink_ext_ack *extack) 5318 { 5319 struct if_stats_msg *ifsm; 5320 5321 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) { 5322 NL_SET_ERR_MSG(extack, "Invalid header for stats dump"); 5323 return -EINVAL; 5324 } 5325 5326 if (!strict_check) 5327 return 0; 5328 5329 ifsm = nlmsg_data(nlh); 5330 5331 /* only requests using strict checks can pass data to influence 5332 * the dump. The legacy exception is filter_mask. 5333 */ 5334 if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) { 5335 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request"); 5336 return -EINVAL; 5337 } 5338 if (nlmsg_attrlen(nlh, sizeof(*ifsm))) { 5339 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header"); 5340 return -EINVAL; 5341 } 5342 if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) { 5343 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask"); 5344 return -EINVAL; 5345 } 5346 5347 return 0; 5348 } 5349 5350 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh, 5351 struct netlink_ext_ack *extack) 5352 { 5353 struct net *net = sock_net(skb->sk); 5354 struct net_device *dev = NULL; 5355 int idxattr = 0, prividx = 0; 5356 struct if_stats_msg *ifsm; 5357 struct sk_buff *nskb; 5358 u32 filter_mask; 5359 int err; 5360 5361 err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb), 5362 false, extack); 5363 if (err) 5364 return err; 5365 5366 ifsm = nlmsg_data(nlh); 5367 if (ifsm->ifindex > 0) 5368 dev = __dev_get_by_index(net, ifsm->ifindex); 5369 else 5370 return -EINVAL; 5371 5372 if (!dev) 5373 return -ENODEV; 5374 5375 filter_mask = ifsm->filter_mask; 5376 if (!filter_mask) 5377 return -EINVAL; 5378 5379 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL); 5380 if (!nskb) 5381 return -ENOBUFS; 5382 5383 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS, 5384 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 5385 0, filter_mask, &idxattr, &prividx); 5386 if (err < 0) { 5387 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */ 5388 WARN_ON(err == -EMSGSIZE); 5389 kfree_skb(nskb); 5390 } else { 5391 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 5392 } 5393 5394 return err; 5395 } 5396 5397 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb) 5398 { 5399 struct netlink_ext_ack *extack = cb->extack; 5400 int h, s_h, err, s_idx, s_idxattr, s_prividx; 5401 struct net *net = sock_net(skb->sk); 5402 unsigned int flags = NLM_F_MULTI; 5403 struct if_stats_msg *ifsm; 5404 struct hlist_head *head; 5405 struct net_device *dev; 5406 u32 filter_mask = 0; 5407 int idx = 0; 5408 5409 s_h = cb->args[0]; 5410 s_idx = cb->args[1]; 5411 s_idxattr = cb->args[2]; 5412 s_prividx = cb->args[3]; 5413 5414 cb->seq = net->dev_base_seq; 5415 5416 err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack); 5417 if (err) 5418 return err; 5419 5420 ifsm = nlmsg_data(cb->nlh); 5421 filter_mask = ifsm->filter_mask; 5422 if (!filter_mask) { 5423 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump"); 5424 return -EINVAL; 5425 } 5426 5427 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5428 idx = 0; 5429 head = &net->dev_index_head[h]; 5430 hlist_for_each_entry(dev, head, index_hlist) { 5431 if (idx < s_idx) 5432 goto cont; 5433 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 5434 NETLINK_CB(cb->skb).portid, 5435 cb->nlh->nlmsg_seq, 0, 5436 flags, filter_mask, 5437 &s_idxattr, &s_prividx); 5438 /* If we ran out of room on the first message, 5439 * we're in trouble 5440 */ 5441 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 5442 5443 if (err < 0) 5444 goto out; 5445 s_prividx = 0; 5446 s_idxattr = 0; 5447 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5448 cont: 5449 idx++; 5450 } 5451 } 5452 out: 5453 cb->args[3] = s_prividx; 5454 cb->args[2] = s_idxattr; 5455 cb->args[1] = idx; 5456 cb->args[0] = h; 5457 5458 return skb->len; 5459 } 5460 5461 /* Process one rtnetlink message. */ 5462 5463 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 5464 struct netlink_ext_ack *extack) 5465 { 5466 struct net *net = sock_net(skb->sk); 5467 struct rtnl_link *link; 5468 struct module *owner; 5469 int err = -EOPNOTSUPP; 5470 rtnl_doit_func doit; 5471 unsigned int flags; 5472 int kind; 5473 int family; 5474 int type; 5475 5476 type = nlh->nlmsg_type; 5477 if (type > RTM_MAX) 5478 return -EOPNOTSUPP; 5479 5480 type -= RTM_BASE; 5481 5482 /* All the messages must have at least 1 byte length */ 5483 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 5484 return 0; 5485 5486 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 5487 kind = type&3; 5488 5489 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 5490 return -EPERM; 5491 5492 rcu_read_lock(); 5493 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 5494 struct sock *rtnl; 5495 rtnl_dumpit_func dumpit; 5496 u32 min_dump_alloc = 0; 5497 5498 link = rtnl_get_link(family, type); 5499 if (!link || !link->dumpit) { 5500 family = PF_UNSPEC; 5501 link = rtnl_get_link(family, type); 5502 if (!link || !link->dumpit) 5503 goto err_unlock; 5504 } 5505 owner = link->owner; 5506 dumpit = link->dumpit; 5507 5508 if (type == RTM_GETLINK - RTM_BASE) 5509 min_dump_alloc = rtnl_calcit(skb, nlh); 5510 5511 err = 0; 5512 /* need to do this before rcu_read_unlock() */ 5513 if (!try_module_get(owner)) 5514 err = -EPROTONOSUPPORT; 5515 5516 rcu_read_unlock(); 5517 5518 rtnl = net->rtnl; 5519 if (err == 0) { 5520 struct netlink_dump_control c = { 5521 .dump = dumpit, 5522 .min_dump_alloc = min_dump_alloc, 5523 .module = owner, 5524 }; 5525 err = netlink_dump_start(rtnl, skb, nlh, &c); 5526 /* netlink_dump_start() will keep a reference on 5527 * module if dump is still in progress. 5528 */ 5529 module_put(owner); 5530 } 5531 return err; 5532 } 5533 5534 link = rtnl_get_link(family, type); 5535 if (!link || !link->doit) { 5536 family = PF_UNSPEC; 5537 link = rtnl_get_link(PF_UNSPEC, type); 5538 if (!link || !link->doit) 5539 goto out_unlock; 5540 } 5541 5542 owner = link->owner; 5543 if (!try_module_get(owner)) { 5544 err = -EPROTONOSUPPORT; 5545 goto out_unlock; 5546 } 5547 5548 flags = link->flags; 5549 if (flags & RTNL_FLAG_DOIT_UNLOCKED) { 5550 doit = link->doit; 5551 rcu_read_unlock(); 5552 if (doit) 5553 err = doit(skb, nlh, extack); 5554 module_put(owner); 5555 return err; 5556 } 5557 rcu_read_unlock(); 5558 5559 rtnl_lock(); 5560 link = rtnl_get_link(family, type); 5561 if (link && link->doit) 5562 err = link->doit(skb, nlh, extack); 5563 rtnl_unlock(); 5564 5565 module_put(owner); 5566 5567 return err; 5568 5569 out_unlock: 5570 rcu_read_unlock(); 5571 return err; 5572 5573 err_unlock: 5574 rcu_read_unlock(); 5575 return -EOPNOTSUPP; 5576 } 5577 5578 static void rtnetlink_rcv(struct sk_buff *skb) 5579 { 5580 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 5581 } 5582 5583 static int rtnetlink_bind(struct net *net, int group) 5584 { 5585 switch (group) { 5586 case RTNLGRP_IPV4_MROUTE_R: 5587 case RTNLGRP_IPV6_MROUTE_R: 5588 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 5589 return -EPERM; 5590 break; 5591 } 5592 return 0; 5593 } 5594 5595 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 5596 { 5597 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 5598 5599 switch (event) { 5600 case NETDEV_REBOOT: 5601 case NETDEV_CHANGEMTU: 5602 case NETDEV_CHANGEADDR: 5603 case NETDEV_CHANGENAME: 5604 case NETDEV_FEAT_CHANGE: 5605 case NETDEV_BONDING_FAILOVER: 5606 case NETDEV_POST_TYPE_CHANGE: 5607 case NETDEV_NOTIFY_PEERS: 5608 case NETDEV_CHANGEUPPER: 5609 case NETDEV_RESEND_IGMP: 5610 case NETDEV_CHANGEINFODATA: 5611 case NETDEV_CHANGELOWERSTATE: 5612 case NETDEV_CHANGE_TX_QUEUE_LEN: 5613 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event), 5614 GFP_KERNEL, NULL, 0); 5615 break; 5616 default: 5617 break; 5618 } 5619 return NOTIFY_DONE; 5620 } 5621 5622 static struct notifier_block rtnetlink_dev_notifier = { 5623 .notifier_call = rtnetlink_event, 5624 }; 5625 5626 5627 static int __net_init rtnetlink_net_init(struct net *net) 5628 { 5629 struct sock *sk; 5630 struct netlink_kernel_cfg cfg = { 5631 .groups = RTNLGRP_MAX, 5632 .input = rtnetlink_rcv, 5633 .cb_mutex = &rtnl_mutex, 5634 .flags = NL_CFG_F_NONROOT_RECV, 5635 .bind = rtnetlink_bind, 5636 }; 5637 5638 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 5639 if (!sk) 5640 return -ENOMEM; 5641 net->rtnl = sk; 5642 return 0; 5643 } 5644 5645 static void __net_exit rtnetlink_net_exit(struct net *net) 5646 { 5647 netlink_kernel_release(net->rtnl); 5648 net->rtnl = NULL; 5649 } 5650 5651 static struct pernet_operations rtnetlink_net_ops = { 5652 .init = rtnetlink_net_init, 5653 .exit = rtnetlink_net_exit, 5654 }; 5655 5656 void __init rtnetlink_init(void) 5657 { 5658 if (register_pernet_subsys(&rtnetlink_net_ops)) 5659 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 5660 5661 register_netdevice_notifier(&rtnetlink_dev_notifier); 5662 5663 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 5664 rtnl_dump_ifinfo, 0); 5665 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0); 5666 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0); 5667 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0); 5668 5669 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0); 5670 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0); 5671 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0); 5672 5673 rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0); 5674 rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0); 5675 5676 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0); 5677 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0); 5678 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0); 5679 5680 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0); 5681 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0); 5682 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0); 5683 5684 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump, 5685 0); 5686 } 5687