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 36 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 }; 1881 1882 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1883 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1884 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1885 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1886 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1887 }; 1888 1889 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1890 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1891 [IFLA_VF_BROADCAST] = { .type = NLA_REJECT }, 1892 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1893 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED }, 1894 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1895 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1896 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1897 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1898 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1899 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1900 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1901 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1902 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1903 }; 1904 1905 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1906 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1907 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1908 .len = PORT_PROFILE_MAX }, 1909 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1910 .len = PORT_UUID_MAX }, 1911 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1912 .len = PORT_UUID_MAX }, 1913 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1914 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1915 1916 /* Unused, but we need to keep it here since user space could 1917 * fill it. It's also broken with regard to NLA_BINARY use in 1918 * combination with structs. 1919 */ 1920 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1921 .len = sizeof(struct ifla_port_vsi) }, 1922 }; 1923 1924 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = { 1925 [IFLA_XDP_UNSPEC] = { .strict_start_type = IFLA_XDP_EXPECTED_FD }, 1926 [IFLA_XDP_FD] = { .type = NLA_S32 }, 1927 [IFLA_XDP_EXPECTED_FD] = { .type = NLA_S32 }, 1928 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 }, 1929 [IFLA_XDP_FLAGS] = { .type = NLA_U32 }, 1930 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 }, 1931 }; 1932 1933 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 1934 { 1935 const struct rtnl_link_ops *ops = NULL; 1936 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 1937 1938 if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0) 1939 return NULL; 1940 1941 if (linfo[IFLA_INFO_KIND]) { 1942 char kind[MODULE_NAME_LEN]; 1943 1944 nla_strscpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 1945 ops = rtnl_link_ops_get(kind); 1946 } 1947 1948 return ops; 1949 } 1950 1951 static bool link_master_filtered(struct net_device *dev, int master_idx) 1952 { 1953 struct net_device *master; 1954 1955 if (!master_idx) 1956 return false; 1957 1958 master = netdev_master_upper_dev_get(dev); 1959 if (!master || master->ifindex != master_idx) 1960 return true; 1961 1962 return false; 1963 } 1964 1965 static bool link_kind_filtered(const struct net_device *dev, 1966 const struct rtnl_link_ops *kind_ops) 1967 { 1968 if (kind_ops && dev->rtnl_link_ops != kind_ops) 1969 return true; 1970 1971 return false; 1972 } 1973 1974 static bool link_dump_filtered(struct net_device *dev, 1975 int master_idx, 1976 const struct rtnl_link_ops *kind_ops) 1977 { 1978 if (link_master_filtered(dev, master_idx) || 1979 link_kind_filtered(dev, kind_ops)) 1980 return true; 1981 1982 return false; 1983 } 1984 1985 /** 1986 * rtnl_get_net_ns_capable - Get netns if sufficiently privileged. 1987 * @sk: netlink socket 1988 * @netnsid: network namespace identifier 1989 * 1990 * Returns the network namespace identified by netnsid on success or an error 1991 * pointer on failure. 1992 */ 1993 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid) 1994 { 1995 struct net *net; 1996 1997 net = get_net_ns_by_id(sock_net(sk), netnsid); 1998 if (!net) 1999 return ERR_PTR(-EINVAL); 2000 2001 /* For now, the caller is required to have CAP_NET_ADMIN in 2002 * the user namespace owning the target net ns. 2003 */ 2004 if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) { 2005 put_net(net); 2006 return ERR_PTR(-EACCES); 2007 } 2008 return net; 2009 } 2010 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable); 2011 2012 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh, 2013 bool strict_check, struct nlattr **tb, 2014 struct netlink_ext_ack *extack) 2015 { 2016 int hdrlen; 2017 2018 if (strict_check) { 2019 struct ifinfomsg *ifm; 2020 2021 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 2022 NL_SET_ERR_MSG(extack, "Invalid header for link dump"); 2023 return -EINVAL; 2024 } 2025 2026 ifm = nlmsg_data(nlh); 2027 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 2028 ifm->ifi_change) { 2029 NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request"); 2030 return -EINVAL; 2031 } 2032 if (ifm->ifi_index) { 2033 NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps"); 2034 return -EINVAL; 2035 } 2036 2037 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, 2038 IFLA_MAX, ifla_policy, 2039 extack); 2040 } 2041 2042 /* A hack to preserve kernel<->userspace interface. 2043 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 2044 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 2045 * what iproute2 < v3.9.0 used. 2046 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 2047 * attribute, its netlink message is shorter than struct ifinfomsg. 2048 */ 2049 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2050 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2051 2052 return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, 2053 extack); 2054 } 2055 2056 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 2057 { 2058 struct netlink_ext_ack *extack = cb->extack; 2059 const struct nlmsghdr *nlh = cb->nlh; 2060 struct net *net = sock_net(skb->sk); 2061 struct net *tgt_net = net; 2062 int h, s_h; 2063 int idx = 0, s_idx; 2064 struct net_device *dev; 2065 struct hlist_head *head; 2066 struct nlattr *tb[IFLA_MAX+1]; 2067 u32 ext_filter_mask = 0; 2068 const struct rtnl_link_ops *kind_ops = NULL; 2069 unsigned int flags = NLM_F_MULTI; 2070 int master_idx = 0; 2071 int netnsid = -1; 2072 int err, i; 2073 2074 s_h = cb->args[0]; 2075 s_idx = cb->args[1]; 2076 2077 err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack); 2078 if (err < 0) { 2079 if (cb->strict_check) 2080 return err; 2081 2082 goto walk_entries; 2083 } 2084 2085 for (i = 0; i <= IFLA_MAX; ++i) { 2086 if (!tb[i]) 2087 continue; 2088 2089 /* new attributes should only be added with strict checking */ 2090 switch (i) { 2091 case IFLA_TARGET_NETNSID: 2092 netnsid = nla_get_s32(tb[i]); 2093 tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid); 2094 if (IS_ERR(tgt_net)) { 2095 NL_SET_ERR_MSG(extack, "Invalid target network namespace id"); 2096 return PTR_ERR(tgt_net); 2097 } 2098 break; 2099 case IFLA_EXT_MASK: 2100 ext_filter_mask = nla_get_u32(tb[i]); 2101 break; 2102 case IFLA_MASTER: 2103 master_idx = nla_get_u32(tb[i]); 2104 break; 2105 case IFLA_LINKINFO: 2106 kind_ops = linkinfo_to_kind_ops(tb[i]); 2107 break; 2108 default: 2109 if (cb->strict_check) { 2110 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request"); 2111 return -EINVAL; 2112 } 2113 } 2114 } 2115 2116 if (master_idx || kind_ops) 2117 flags |= NLM_F_DUMP_FILTERED; 2118 2119 walk_entries: 2120 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 2121 idx = 0; 2122 head = &tgt_net->dev_index_head[h]; 2123 hlist_for_each_entry(dev, head, index_hlist) { 2124 if (link_dump_filtered(dev, master_idx, kind_ops)) 2125 goto cont; 2126 if (idx < s_idx) 2127 goto cont; 2128 err = rtnl_fill_ifinfo(skb, dev, net, 2129 RTM_NEWLINK, 2130 NETLINK_CB(cb->skb).portid, 2131 nlh->nlmsg_seq, 0, flags, 2132 ext_filter_mask, 0, NULL, 0, 2133 netnsid, GFP_KERNEL); 2134 2135 if (err < 0) { 2136 if (likely(skb->len)) 2137 goto out; 2138 2139 goto out_err; 2140 } 2141 cont: 2142 idx++; 2143 } 2144 } 2145 out: 2146 err = skb->len; 2147 out_err: 2148 cb->args[1] = idx; 2149 cb->args[0] = h; 2150 cb->seq = net->dev_base_seq; 2151 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 2152 if (netnsid >= 0) 2153 put_net(tgt_net); 2154 2155 return err; 2156 } 2157 2158 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len, 2159 struct netlink_ext_ack *exterr) 2160 { 2161 return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy, 2162 exterr); 2163 } 2164 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 2165 2166 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 2167 { 2168 struct net *net; 2169 /* Examine the link attributes and figure out which 2170 * network namespace we are talking about. 2171 */ 2172 if (tb[IFLA_NET_NS_PID]) 2173 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 2174 else if (tb[IFLA_NET_NS_FD]) 2175 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 2176 else 2177 net = get_net(src_net); 2178 return net; 2179 } 2180 EXPORT_SYMBOL(rtnl_link_get_net); 2181 2182 /* Figure out which network namespace we are talking about by 2183 * examining the link attributes in the following order: 2184 * 2185 * 1. IFLA_NET_NS_PID 2186 * 2. IFLA_NET_NS_FD 2187 * 3. IFLA_TARGET_NETNSID 2188 */ 2189 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net, 2190 struct nlattr *tb[]) 2191 { 2192 struct net *net; 2193 2194 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) 2195 return rtnl_link_get_net(src_net, tb); 2196 2197 if (!tb[IFLA_TARGET_NETNSID]) 2198 return get_net(src_net); 2199 2200 net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID])); 2201 if (!net) 2202 return ERR_PTR(-EINVAL); 2203 2204 return net; 2205 } 2206 2207 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb, 2208 struct net *src_net, 2209 struct nlattr *tb[], int cap) 2210 { 2211 struct net *net; 2212 2213 net = rtnl_link_get_net_by_nlattr(src_net, tb); 2214 if (IS_ERR(net)) 2215 return net; 2216 2217 if (!netlink_ns_capable(skb, net->user_ns, cap)) { 2218 put_net(net); 2219 return ERR_PTR(-EPERM); 2220 } 2221 2222 return net; 2223 } 2224 2225 /* Verify that rtnetlink requests do not pass additional properties 2226 * potentially referring to different network namespaces. 2227 */ 2228 static int rtnl_ensure_unique_netns(struct nlattr *tb[], 2229 struct netlink_ext_ack *extack, 2230 bool netns_id_only) 2231 { 2232 2233 if (netns_id_only) { 2234 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD]) 2235 return 0; 2236 2237 NL_SET_ERR_MSG(extack, "specified netns attribute not supported"); 2238 return -EOPNOTSUPP; 2239 } 2240 2241 if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])) 2242 goto invalid_attr; 2243 2244 if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD])) 2245 goto invalid_attr; 2246 2247 if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID])) 2248 goto invalid_attr; 2249 2250 return 0; 2251 2252 invalid_attr: 2253 NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified"); 2254 return -EINVAL; 2255 } 2256 2257 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 2258 { 2259 if (dev) { 2260 if (tb[IFLA_ADDRESS] && 2261 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 2262 return -EINVAL; 2263 2264 if (tb[IFLA_BROADCAST] && 2265 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 2266 return -EINVAL; 2267 } 2268 2269 if (tb[IFLA_AF_SPEC]) { 2270 struct nlattr *af; 2271 int rem, err; 2272 2273 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2274 const struct rtnl_af_ops *af_ops; 2275 2276 rcu_read_lock(); 2277 af_ops = rtnl_af_lookup(nla_type(af)); 2278 if (!af_ops) { 2279 rcu_read_unlock(); 2280 return -EAFNOSUPPORT; 2281 } 2282 2283 if (!af_ops->set_link_af) { 2284 rcu_read_unlock(); 2285 return -EOPNOTSUPP; 2286 } 2287 2288 if (af_ops->validate_link_af) { 2289 err = af_ops->validate_link_af(dev, af); 2290 if (err < 0) { 2291 rcu_read_unlock(); 2292 return err; 2293 } 2294 } 2295 2296 rcu_read_unlock(); 2297 } 2298 } 2299 2300 return 0; 2301 } 2302 2303 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt, 2304 int guid_type) 2305 { 2306 const struct net_device_ops *ops = dev->netdev_ops; 2307 2308 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type); 2309 } 2310 2311 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type) 2312 { 2313 if (dev->type != ARPHRD_INFINIBAND) 2314 return -EOPNOTSUPP; 2315 2316 return handle_infiniband_guid(dev, ivt, guid_type); 2317 } 2318 2319 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 2320 { 2321 const struct net_device_ops *ops = dev->netdev_ops; 2322 int err = -EINVAL; 2323 2324 if (tb[IFLA_VF_MAC]) { 2325 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 2326 2327 if (ivm->vf >= INT_MAX) 2328 return -EINVAL; 2329 err = -EOPNOTSUPP; 2330 if (ops->ndo_set_vf_mac) 2331 err = ops->ndo_set_vf_mac(dev, ivm->vf, 2332 ivm->mac); 2333 if (err < 0) 2334 return err; 2335 } 2336 2337 if (tb[IFLA_VF_VLAN]) { 2338 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 2339 2340 if (ivv->vf >= INT_MAX) 2341 return -EINVAL; 2342 err = -EOPNOTSUPP; 2343 if (ops->ndo_set_vf_vlan) 2344 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 2345 ivv->qos, 2346 htons(ETH_P_8021Q)); 2347 if (err < 0) 2348 return err; 2349 } 2350 2351 if (tb[IFLA_VF_VLAN_LIST]) { 2352 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN]; 2353 struct nlattr *attr; 2354 int rem, len = 0; 2355 2356 err = -EOPNOTSUPP; 2357 if (!ops->ndo_set_vf_vlan) 2358 return err; 2359 2360 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) { 2361 if (nla_type(attr) != IFLA_VF_VLAN_INFO || 2362 nla_len(attr) < NLA_HDRLEN) { 2363 return -EINVAL; 2364 } 2365 if (len >= MAX_VLAN_LIST_LEN) 2366 return -EOPNOTSUPP; 2367 ivvl[len] = nla_data(attr); 2368 2369 len++; 2370 } 2371 if (len == 0) 2372 return -EINVAL; 2373 2374 if (ivvl[0]->vf >= INT_MAX) 2375 return -EINVAL; 2376 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan, 2377 ivvl[0]->qos, ivvl[0]->vlan_proto); 2378 if (err < 0) 2379 return err; 2380 } 2381 2382 if (tb[IFLA_VF_TX_RATE]) { 2383 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 2384 struct ifla_vf_info ivf; 2385 2386 if (ivt->vf >= INT_MAX) 2387 return -EINVAL; 2388 err = -EOPNOTSUPP; 2389 if (ops->ndo_get_vf_config) 2390 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 2391 if (err < 0) 2392 return err; 2393 2394 err = -EOPNOTSUPP; 2395 if (ops->ndo_set_vf_rate) 2396 err = ops->ndo_set_vf_rate(dev, ivt->vf, 2397 ivf.min_tx_rate, 2398 ivt->rate); 2399 if (err < 0) 2400 return err; 2401 } 2402 2403 if (tb[IFLA_VF_RATE]) { 2404 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 2405 2406 if (ivt->vf >= INT_MAX) 2407 return -EINVAL; 2408 err = -EOPNOTSUPP; 2409 if (ops->ndo_set_vf_rate) 2410 err = ops->ndo_set_vf_rate(dev, ivt->vf, 2411 ivt->min_tx_rate, 2412 ivt->max_tx_rate); 2413 if (err < 0) 2414 return err; 2415 } 2416 2417 if (tb[IFLA_VF_SPOOFCHK]) { 2418 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 2419 2420 if (ivs->vf >= INT_MAX) 2421 return -EINVAL; 2422 err = -EOPNOTSUPP; 2423 if (ops->ndo_set_vf_spoofchk) 2424 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 2425 ivs->setting); 2426 if (err < 0) 2427 return err; 2428 } 2429 2430 if (tb[IFLA_VF_LINK_STATE]) { 2431 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 2432 2433 if (ivl->vf >= INT_MAX) 2434 return -EINVAL; 2435 err = -EOPNOTSUPP; 2436 if (ops->ndo_set_vf_link_state) 2437 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 2438 ivl->link_state); 2439 if (err < 0) 2440 return err; 2441 } 2442 2443 if (tb[IFLA_VF_RSS_QUERY_EN]) { 2444 struct ifla_vf_rss_query_en *ivrssq_en; 2445 2446 err = -EOPNOTSUPP; 2447 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 2448 if (ivrssq_en->vf >= INT_MAX) 2449 return -EINVAL; 2450 if (ops->ndo_set_vf_rss_query_en) 2451 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 2452 ivrssq_en->setting); 2453 if (err < 0) 2454 return err; 2455 } 2456 2457 if (tb[IFLA_VF_TRUST]) { 2458 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 2459 2460 if (ivt->vf >= INT_MAX) 2461 return -EINVAL; 2462 err = -EOPNOTSUPP; 2463 if (ops->ndo_set_vf_trust) 2464 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 2465 if (err < 0) 2466 return err; 2467 } 2468 2469 if (tb[IFLA_VF_IB_NODE_GUID]) { 2470 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]); 2471 2472 if (ivt->vf >= INT_MAX) 2473 return -EINVAL; 2474 if (!ops->ndo_set_vf_guid) 2475 return -EOPNOTSUPP; 2476 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID); 2477 } 2478 2479 if (tb[IFLA_VF_IB_PORT_GUID]) { 2480 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]); 2481 2482 if (ivt->vf >= INT_MAX) 2483 return -EINVAL; 2484 if (!ops->ndo_set_vf_guid) 2485 return -EOPNOTSUPP; 2486 2487 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID); 2488 } 2489 2490 return err; 2491 } 2492 2493 static int do_set_master(struct net_device *dev, int ifindex, 2494 struct netlink_ext_ack *extack) 2495 { 2496 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 2497 const struct net_device_ops *ops; 2498 int err; 2499 2500 if (upper_dev) { 2501 if (upper_dev->ifindex == ifindex) 2502 return 0; 2503 ops = upper_dev->netdev_ops; 2504 if (ops->ndo_del_slave) { 2505 err = ops->ndo_del_slave(upper_dev, dev); 2506 if (err) 2507 return err; 2508 } else { 2509 return -EOPNOTSUPP; 2510 } 2511 } 2512 2513 if (ifindex) { 2514 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 2515 if (!upper_dev) 2516 return -EINVAL; 2517 ops = upper_dev->netdev_ops; 2518 if (ops->ndo_add_slave) { 2519 err = ops->ndo_add_slave(upper_dev, dev, extack); 2520 if (err) 2521 return err; 2522 } else { 2523 return -EOPNOTSUPP; 2524 } 2525 } 2526 return 0; 2527 } 2528 2529 static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = { 2530 [IFLA_PROTO_DOWN_REASON_MASK] = { .type = NLA_U32 }, 2531 [IFLA_PROTO_DOWN_REASON_VALUE] = { .type = NLA_U32 }, 2532 }; 2533 2534 static int do_set_proto_down(struct net_device *dev, 2535 struct nlattr *nl_proto_down, 2536 struct nlattr *nl_proto_down_reason, 2537 struct netlink_ext_ack *extack) 2538 { 2539 struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1]; 2540 const struct net_device_ops *ops = dev->netdev_ops; 2541 unsigned long mask = 0; 2542 u32 value; 2543 bool proto_down; 2544 int err; 2545 2546 if (!ops->ndo_change_proto_down) { 2547 NL_SET_ERR_MSG(extack, "Protodown not supported by device"); 2548 return -EOPNOTSUPP; 2549 } 2550 2551 if (nl_proto_down_reason) { 2552 err = nla_parse_nested_deprecated(pdreason, 2553 IFLA_PROTO_DOWN_REASON_MAX, 2554 nl_proto_down_reason, 2555 ifla_proto_down_reason_policy, 2556 NULL); 2557 if (err < 0) 2558 return err; 2559 2560 if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) { 2561 NL_SET_ERR_MSG(extack, "Invalid protodown reason value"); 2562 return -EINVAL; 2563 } 2564 2565 value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]); 2566 2567 if (pdreason[IFLA_PROTO_DOWN_REASON_MASK]) 2568 mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]); 2569 2570 dev_change_proto_down_reason(dev, mask, value); 2571 } 2572 2573 if (nl_proto_down) { 2574 proto_down = nla_get_u8(nl_proto_down); 2575 2576 /* Dont turn off protodown if there are active reasons */ 2577 if (!proto_down && dev->proto_down_reason) { 2578 NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons"); 2579 return -EBUSY; 2580 } 2581 err = dev_change_proto_down(dev, 2582 proto_down); 2583 if (err) 2584 return err; 2585 } 2586 2587 return 0; 2588 } 2589 2590 #define DO_SETLINK_MODIFIED 0x01 2591 /* notify flag means notify + modified. */ 2592 #define DO_SETLINK_NOTIFY 0x03 2593 static int do_setlink(const struct sk_buff *skb, 2594 struct net_device *dev, struct ifinfomsg *ifm, 2595 struct netlink_ext_ack *extack, 2596 struct nlattr **tb, char *ifname, int status) 2597 { 2598 const struct net_device_ops *ops = dev->netdev_ops; 2599 int err; 2600 2601 err = validate_linkmsg(dev, tb); 2602 if (err < 0) 2603 return err; 2604 2605 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) { 2606 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev), 2607 tb, CAP_NET_ADMIN); 2608 if (IS_ERR(net)) { 2609 err = PTR_ERR(net); 2610 goto errout; 2611 } 2612 2613 err = dev_change_net_namespace(dev, net, ifname); 2614 put_net(net); 2615 if (err) 2616 goto errout; 2617 status |= DO_SETLINK_MODIFIED; 2618 } 2619 2620 if (tb[IFLA_MAP]) { 2621 struct rtnl_link_ifmap *u_map; 2622 struct ifmap k_map; 2623 2624 if (!ops->ndo_set_config) { 2625 err = -EOPNOTSUPP; 2626 goto errout; 2627 } 2628 2629 if (!netif_device_present(dev)) { 2630 err = -ENODEV; 2631 goto errout; 2632 } 2633 2634 u_map = nla_data(tb[IFLA_MAP]); 2635 k_map.mem_start = (unsigned long) u_map->mem_start; 2636 k_map.mem_end = (unsigned long) u_map->mem_end; 2637 k_map.base_addr = (unsigned short) u_map->base_addr; 2638 k_map.irq = (unsigned char) u_map->irq; 2639 k_map.dma = (unsigned char) u_map->dma; 2640 k_map.port = (unsigned char) u_map->port; 2641 2642 err = ops->ndo_set_config(dev, &k_map); 2643 if (err < 0) 2644 goto errout; 2645 2646 status |= DO_SETLINK_NOTIFY; 2647 } 2648 2649 if (tb[IFLA_ADDRESS]) { 2650 struct sockaddr *sa; 2651 int len; 2652 2653 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len, 2654 sizeof(*sa)); 2655 sa = kmalloc(len, GFP_KERNEL); 2656 if (!sa) { 2657 err = -ENOMEM; 2658 goto errout; 2659 } 2660 sa->sa_family = dev->type; 2661 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 2662 dev->addr_len); 2663 err = dev_set_mac_address(dev, sa, extack); 2664 kfree(sa); 2665 if (err) 2666 goto errout; 2667 status |= DO_SETLINK_MODIFIED; 2668 } 2669 2670 if (tb[IFLA_MTU]) { 2671 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack); 2672 if (err < 0) 2673 goto errout; 2674 status |= DO_SETLINK_MODIFIED; 2675 } 2676 2677 if (tb[IFLA_GROUP]) { 2678 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2679 status |= DO_SETLINK_NOTIFY; 2680 } 2681 2682 /* 2683 * Interface selected by interface index but interface 2684 * name provided implies that a name change has been 2685 * requested. 2686 */ 2687 if (ifm->ifi_index > 0 && ifname[0]) { 2688 err = dev_change_name(dev, ifname); 2689 if (err < 0) 2690 goto errout; 2691 status |= DO_SETLINK_MODIFIED; 2692 } 2693 2694 if (tb[IFLA_IFALIAS]) { 2695 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 2696 nla_len(tb[IFLA_IFALIAS])); 2697 if (err < 0) 2698 goto errout; 2699 status |= DO_SETLINK_NOTIFY; 2700 } 2701 2702 if (tb[IFLA_BROADCAST]) { 2703 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 2704 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 2705 } 2706 2707 if (ifm->ifi_flags || ifm->ifi_change) { 2708 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm), 2709 extack); 2710 if (err < 0) 2711 goto errout; 2712 } 2713 2714 if (tb[IFLA_MASTER]) { 2715 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); 2716 if (err) 2717 goto errout; 2718 status |= DO_SETLINK_MODIFIED; 2719 } 2720 2721 if (tb[IFLA_CARRIER]) { 2722 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 2723 if (err) 2724 goto errout; 2725 status |= DO_SETLINK_MODIFIED; 2726 } 2727 2728 if (tb[IFLA_TXQLEN]) { 2729 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]); 2730 2731 err = dev_change_tx_queue_len(dev, value); 2732 if (err) 2733 goto errout; 2734 status |= DO_SETLINK_MODIFIED; 2735 } 2736 2737 if (tb[IFLA_GSO_MAX_SIZE]) { 2738 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]); 2739 2740 if (max_size > GSO_MAX_SIZE) { 2741 err = -EINVAL; 2742 goto errout; 2743 } 2744 2745 if (dev->gso_max_size ^ max_size) { 2746 netif_set_gso_max_size(dev, max_size); 2747 status |= DO_SETLINK_MODIFIED; 2748 } 2749 } 2750 2751 if (tb[IFLA_GSO_MAX_SEGS]) { 2752 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]); 2753 2754 if (max_segs > GSO_MAX_SEGS) { 2755 err = -EINVAL; 2756 goto errout; 2757 } 2758 2759 if (dev->gso_max_segs ^ max_segs) { 2760 dev->gso_max_segs = max_segs; 2761 status |= DO_SETLINK_MODIFIED; 2762 } 2763 } 2764 2765 if (tb[IFLA_OPERSTATE]) 2766 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2767 2768 if (tb[IFLA_LINKMODE]) { 2769 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 2770 2771 write_lock_bh(&dev_base_lock); 2772 if (dev->link_mode ^ value) 2773 status |= DO_SETLINK_NOTIFY; 2774 dev->link_mode = value; 2775 write_unlock_bh(&dev_base_lock); 2776 } 2777 2778 if (tb[IFLA_VFINFO_LIST]) { 2779 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 2780 struct nlattr *attr; 2781 int rem; 2782 2783 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 2784 if (nla_type(attr) != IFLA_VF_INFO || 2785 nla_len(attr) < NLA_HDRLEN) { 2786 err = -EINVAL; 2787 goto errout; 2788 } 2789 err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX, 2790 attr, 2791 ifla_vf_policy, 2792 NULL); 2793 if (err < 0) 2794 goto errout; 2795 err = do_setvfinfo(dev, vfinfo); 2796 if (err < 0) 2797 goto errout; 2798 status |= DO_SETLINK_NOTIFY; 2799 } 2800 } 2801 err = 0; 2802 2803 if (tb[IFLA_VF_PORTS]) { 2804 struct nlattr *port[IFLA_PORT_MAX+1]; 2805 struct nlattr *attr; 2806 int vf; 2807 int rem; 2808 2809 err = -EOPNOTSUPP; 2810 if (!ops->ndo_set_vf_port) 2811 goto errout; 2812 2813 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 2814 if (nla_type(attr) != IFLA_VF_PORT || 2815 nla_len(attr) < NLA_HDRLEN) { 2816 err = -EINVAL; 2817 goto errout; 2818 } 2819 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX, 2820 attr, 2821 ifla_port_policy, 2822 NULL); 2823 if (err < 0) 2824 goto errout; 2825 if (!port[IFLA_PORT_VF]) { 2826 err = -EOPNOTSUPP; 2827 goto errout; 2828 } 2829 vf = nla_get_u32(port[IFLA_PORT_VF]); 2830 err = ops->ndo_set_vf_port(dev, vf, port); 2831 if (err < 0) 2832 goto errout; 2833 status |= DO_SETLINK_NOTIFY; 2834 } 2835 } 2836 err = 0; 2837 2838 if (tb[IFLA_PORT_SELF]) { 2839 struct nlattr *port[IFLA_PORT_MAX+1]; 2840 2841 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX, 2842 tb[IFLA_PORT_SELF], 2843 ifla_port_policy, NULL); 2844 if (err < 0) 2845 goto errout; 2846 2847 err = -EOPNOTSUPP; 2848 if (ops->ndo_set_vf_port) 2849 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 2850 if (err < 0) 2851 goto errout; 2852 status |= DO_SETLINK_NOTIFY; 2853 } 2854 2855 if (tb[IFLA_AF_SPEC]) { 2856 struct nlattr *af; 2857 int rem; 2858 2859 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2860 const struct rtnl_af_ops *af_ops; 2861 2862 rcu_read_lock(); 2863 2864 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af)))); 2865 2866 err = af_ops->set_link_af(dev, af); 2867 if (err < 0) { 2868 rcu_read_unlock(); 2869 goto errout; 2870 } 2871 2872 rcu_read_unlock(); 2873 status |= DO_SETLINK_NOTIFY; 2874 } 2875 } 2876 err = 0; 2877 2878 if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) { 2879 err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN], 2880 tb[IFLA_PROTO_DOWN_REASON], extack); 2881 if (err) 2882 goto errout; 2883 status |= DO_SETLINK_NOTIFY; 2884 } 2885 2886 if (tb[IFLA_XDP]) { 2887 struct nlattr *xdp[IFLA_XDP_MAX + 1]; 2888 u32 xdp_flags = 0; 2889 2890 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX, 2891 tb[IFLA_XDP], 2892 ifla_xdp_policy, NULL); 2893 if (err < 0) 2894 goto errout; 2895 2896 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) { 2897 err = -EINVAL; 2898 goto errout; 2899 } 2900 2901 if (xdp[IFLA_XDP_FLAGS]) { 2902 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]); 2903 if (xdp_flags & ~XDP_FLAGS_MASK) { 2904 err = -EINVAL; 2905 goto errout; 2906 } 2907 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) { 2908 err = -EINVAL; 2909 goto errout; 2910 } 2911 } 2912 2913 if (xdp[IFLA_XDP_FD]) { 2914 int expected_fd = -1; 2915 2916 if (xdp_flags & XDP_FLAGS_REPLACE) { 2917 if (!xdp[IFLA_XDP_EXPECTED_FD]) { 2918 err = -EINVAL; 2919 goto errout; 2920 } 2921 expected_fd = 2922 nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]); 2923 } 2924 2925 err = dev_change_xdp_fd(dev, extack, 2926 nla_get_s32(xdp[IFLA_XDP_FD]), 2927 expected_fd, 2928 xdp_flags); 2929 if (err) 2930 goto errout; 2931 status |= DO_SETLINK_NOTIFY; 2932 } 2933 } 2934 2935 errout: 2936 if (status & DO_SETLINK_MODIFIED) { 2937 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY) 2938 netdev_state_change(dev); 2939 2940 if (err < 0) 2941 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", 2942 dev->name); 2943 } 2944 2945 return err; 2946 } 2947 2948 static struct net_device *rtnl_dev_get(struct net *net, 2949 struct nlattr *ifname_attr, 2950 struct nlattr *altifname_attr, 2951 char *ifname) 2952 { 2953 char buffer[ALTIFNAMSIZ]; 2954 2955 if (!ifname) { 2956 ifname = buffer; 2957 if (ifname_attr) 2958 nla_strscpy(ifname, ifname_attr, IFNAMSIZ); 2959 else if (altifname_attr) 2960 nla_strscpy(ifname, altifname_attr, ALTIFNAMSIZ); 2961 else 2962 return NULL; 2963 } 2964 2965 return __dev_get_by_name(net, ifname); 2966 } 2967 2968 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 2969 struct netlink_ext_ack *extack) 2970 { 2971 struct net *net = sock_net(skb->sk); 2972 struct ifinfomsg *ifm; 2973 struct net_device *dev; 2974 int err; 2975 struct nlattr *tb[IFLA_MAX+1]; 2976 char ifname[IFNAMSIZ]; 2977 2978 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 2979 ifla_policy, extack); 2980 if (err < 0) 2981 goto errout; 2982 2983 err = rtnl_ensure_unique_netns(tb, extack, false); 2984 if (err < 0) 2985 goto errout; 2986 2987 if (tb[IFLA_IFNAME]) 2988 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2989 else 2990 ifname[0] = '\0'; 2991 2992 err = -EINVAL; 2993 ifm = nlmsg_data(nlh); 2994 if (ifm->ifi_index > 0) 2995 dev = __dev_get_by_index(net, ifm->ifi_index); 2996 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 2997 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname); 2998 else 2999 goto errout; 3000 3001 if (dev == NULL) { 3002 err = -ENODEV; 3003 goto errout; 3004 } 3005 3006 err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0); 3007 errout: 3008 return err; 3009 } 3010 3011 static int rtnl_group_dellink(const struct net *net, int group) 3012 { 3013 struct net_device *dev, *aux; 3014 LIST_HEAD(list_kill); 3015 bool found = false; 3016 3017 if (!group) 3018 return -EPERM; 3019 3020 for_each_netdev(net, dev) { 3021 if (dev->group == group) { 3022 const struct rtnl_link_ops *ops; 3023 3024 found = true; 3025 ops = dev->rtnl_link_ops; 3026 if (!ops || !ops->dellink) 3027 return -EOPNOTSUPP; 3028 } 3029 } 3030 3031 if (!found) 3032 return -ENODEV; 3033 3034 for_each_netdev_safe(net, dev, aux) { 3035 if (dev->group == group) { 3036 const struct rtnl_link_ops *ops; 3037 3038 ops = dev->rtnl_link_ops; 3039 ops->dellink(dev, &list_kill); 3040 } 3041 } 3042 unregister_netdevice_many(&list_kill); 3043 3044 return 0; 3045 } 3046 3047 int rtnl_delete_link(struct net_device *dev) 3048 { 3049 const struct rtnl_link_ops *ops; 3050 LIST_HEAD(list_kill); 3051 3052 ops = dev->rtnl_link_ops; 3053 if (!ops || !ops->dellink) 3054 return -EOPNOTSUPP; 3055 3056 ops->dellink(dev, &list_kill); 3057 unregister_netdevice_many(&list_kill); 3058 3059 return 0; 3060 } 3061 EXPORT_SYMBOL_GPL(rtnl_delete_link); 3062 3063 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 3064 struct netlink_ext_ack *extack) 3065 { 3066 struct net *net = sock_net(skb->sk); 3067 struct net *tgt_net = net; 3068 struct net_device *dev = NULL; 3069 struct ifinfomsg *ifm; 3070 struct nlattr *tb[IFLA_MAX+1]; 3071 int err; 3072 int netnsid = -1; 3073 3074 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3075 ifla_policy, extack); 3076 if (err < 0) 3077 return err; 3078 3079 err = rtnl_ensure_unique_netns(tb, extack, true); 3080 if (err < 0) 3081 return err; 3082 3083 if (tb[IFLA_TARGET_NETNSID]) { 3084 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 3085 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid); 3086 if (IS_ERR(tgt_net)) 3087 return PTR_ERR(tgt_net); 3088 } 3089 3090 err = -EINVAL; 3091 ifm = nlmsg_data(nlh); 3092 if (ifm->ifi_index > 0) 3093 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 3094 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3095 dev = rtnl_dev_get(net, tb[IFLA_IFNAME], 3096 tb[IFLA_ALT_IFNAME], NULL); 3097 else if (tb[IFLA_GROUP]) 3098 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP])); 3099 else 3100 goto out; 3101 3102 if (!dev) { 3103 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0) 3104 err = -ENODEV; 3105 3106 goto out; 3107 } 3108 3109 err = rtnl_delete_link(dev); 3110 3111 out: 3112 if (netnsid >= 0) 3113 put_net(tgt_net); 3114 3115 return err; 3116 } 3117 3118 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 3119 { 3120 unsigned int old_flags; 3121 int err; 3122 3123 old_flags = dev->flags; 3124 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 3125 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm), 3126 NULL); 3127 if (err < 0) 3128 return err; 3129 } 3130 3131 if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) { 3132 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags)); 3133 } else { 3134 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 3135 __dev_notify_flags(dev, old_flags, ~0U); 3136 } 3137 return 0; 3138 } 3139 EXPORT_SYMBOL(rtnl_configure_link); 3140 3141 struct net_device *rtnl_create_link(struct net *net, const char *ifname, 3142 unsigned char name_assign_type, 3143 const struct rtnl_link_ops *ops, 3144 struct nlattr *tb[], 3145 struct netlink_ext_ack *extack) 3146 { 3147 struct net_device *dev; 3148 unsigned int num_tx_queues = 1; 3149 unsigned int num_rx_queues = 1; 3150 3151 if (tb[IFLA_NUM_TX_QUEUES]) 3152 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 3153 else if (ops->get_num_tx_queues) 3154 num_tx_queues = ops->get_num_tx_queues(); 3155 3156 if (tb[IFLA_NUM_RX_QUEUES]) 3157 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 3158 else if (ops->get_num_rx_queues) 3159 num_rx_queues = ops->get_num_rx_queues(); 3160 3161 if (num_tx_queues < 1 || num_tx_queues > 4096) { 3162 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues"); 3163 return ERR_PTR(-EINVAL); 3164 } 3165 3166 if (num_rx_queues < 1 || num_rx_queues > 4096) { 3167 NL_SET_ERR_MSG(extack, "Invalid number of receive queues"); 3168 return ERR_PTR(-EINVAL); 3169 } 3170 3171 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 3172 ops->setup, num_tx_queues, num_rx_queues); 3173 if (!dev) 3174 return ERR_PTR(-ENOMEM); 3175 3176 dev_net_set(dev, net); 3177 dev->rtnl_link_ops = ops; 3178 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 3179 3180 if (tb[IFLA_MTU]) { 3181 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3182 int err; 3183 3184 err = dev_validate_mtu(dev, mtu, extack); 3185 if (err) { 3186 free_netdev(dev); 3187 return ERR_PTR(err); 3188 } 3189 dev->mtu = mtu; 3190 } 3191 if (tb[IFLA_ADDRESS]) { 3192 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 3193 nla_len(tb[IFLA_ADDRESS])); 3194 dev->addr_assign_type = NET_ADDR_SET; 3195 } 3196 if (tb[IFLA_BROADCAST]) 3197 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 3198 nla_len(tb[IFLA_BROADCAST])); 3199 if (tb[IFLA_TXQLEN]) 3200 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 3201 if (tb[IFLA_OPERSTATE]) 3202 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 3203 if (tb[IFLA_LINKMODE]) 3204 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 3205 if (tb[IFLA_GROUP]) 3206 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 3207 if (tb[IFLA_GSO_MAX_SIZE]) 3208 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE])); 3209 if (tb[IFLA_GSO_MAX_SEGS]) 3210 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]); 3211 3212 return dev; 3213 } 3214 EXPORT_SYMBOL(rtnl_create_link); 3215 3216 static int rtnl_group_changelink(const struct sk_buff *skb, 3217 struct net *net, int group, 3218 struct ifinfomsg *ifm, 3219 struct netlink_ext_ack *extack, 3220 struct nlattr **tb) 3221 { 3222 struct net_device *dev, *aux; 3223 int err; 3224 3225 for_each_netdev_safe(net, dev, aux) { 3226 if (dev->group == group) { 3227 err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0); 3228 if (err < 0) 3229 return err; 3230 } 3231 } 3232 3233 return 0; 3234 } 3235 3236 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3237 struct nlattr **attr, struct netlink_ext_ack *extack) 3238 { 3239 struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1]; 3240 unsigned char name_assign_type = NET_NAME_USER; 3241 struct nlattr *linkinfo[IFLA_INFO_MAX + 1]; 3242 const struct rtnl_link_ops *m_ops = NULL; 3243 struct net_device *master_dev = NULL; 3244 struct net *net = sock_net(skb->sk); 3245 const struct rtnl_link_ops *ops; 3246 struct nlattr *tb[IFLA_MAX + 1]; 3247 struct net *dest_net, *link_net; 3248 struct nlattr **slave_data; 3249 char kind[MODULE_NAME_LEN]; 3250 struct net_device *dev; 3251 struct ifinfomsg *ifm; 3252 char ifname[IFNAMSIZ]; 3253 struct nlattr **data; 3254 int err; 3255 3256 #ifdef CONFIG_MODULES 3257 replay: 3258 #endif 3259 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3260 ifla_policy, extack); 3261 if (err < 0) 3262 return err; 3263 3264 err = rtnl_ensure_unique_netns(tb, extack, false); 3265 if (err < 0) 3266 return err; 3267 3268 if (tb[IFLA_IFNAME]) 3269 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 3270 else 3271 ifname[0] = '\0'; 3272 3273 ifm = nlmsg_data(nlh); 3274 if (ifm->ifi_index > 0) 3275 dev = __dev_get_by_index(net, ifm->ifi_index); 3276 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3277 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname); 3278 else 3279 dev = NULL; 3280 3281 if (dev) { 3282 master_dev = netdev_master_upper_dev_get(dev); 3283 if (master_dev) 3284 m_ops = master_dev->rtnl_link_ops; 3285 } 3286 3287 err = validate_linkmsg(dev, tb); 3288 if (err < 0) 3289 return err; 3290 3291 if (tb[IFLA_LINKINFO]) { 3292 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX, 3293 tb[IFLA_LINKINFO], 3294 ifla_info_policy, NULL); 3295 if (err < 0) 3296 return err; 3297 } else 3298 memset(linkinfo, 0, sizeof(linkinfo)); 3299 3300 if (linkinfo[IFLA_INFO_KIND]) { 3301 nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 3302 ops = rtnl_link_ops_get(kind); 3303 } else { 3304 kind[0] = '\0'; 3305 ops = NULL; 3306 } 3307 3308 data = NULL; 3309 if (ops) { 3310 if (ops->maxtype > RTNL_MAX_TYPE) 3311 return -EINVAL; 3312 3313 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 3314 err = nla_parse_nested_deprecated(attr, ops->maxtype, 3315 linkinfo[IFLA_INFO_DATA], 3316 ops->policy, extack); 3317 if (err < 0) 3318 return err; 3319 data = attr; 3320 } 3321 if (ops->validate) { 3322 err = ops->validate(tb, data, extack); 3323 if (err < 0) 3324 return err; 3325 } 3326 } 3327 3328 slave_data = NULL; 3329 if (m_ops) { 3330 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE) 3331 return -EINVAL; 3332 3333 if (m_ops->slave_maxtype && 3334 linkinfo[IFLA_INFO_SLAVE_DATA]) { 3335 err = nla_parse_nested_deprecated(slave_attr, 3336 m_ops->slave_maxtype, 3337 linkinfo[IFLA_INFO_SLAVE_DATA], 3338 m_ops->slave_policy, 3339 extack); 3340 if (err < 0) 3341 return err; 3342 slave_data = slave_attr; 3343 } 3344 } 3345 3346 if (dev) { 3347 int status = 0; 3348 3349 if (nlh->nlmsg_flags & NLM_F_EXCL) 3350 return -EEXIST; 3351 if (nlh->nlmsg_flags & NLM_F_REPLACE) 3352 return -EOPNOTSUPP; 3353 3354 if (linkinfo[IFLA_INFO_DATA]) { 3355 if (!ops || ops != dev->rtnl_link_ops || 3356 !ops->changelink) 3357 return -EOPNOTSUPP; 3358 3359 err = ops->changelink(dev, tb, data, extack); 3360 if (err < 0) 3361 return err; 3362 status |= DO_SETLINK_NOTIFY; 3363 } 3364 3365 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 3366 if (!m_ops || !m_ops->slave_changelink) 3367 return -EOPNOTSUPP; 3368 3369 err = m_ops->slave_changelink(master_dev, dev, tb, 3370 slave_data, extack); 3371 if (err < 0) 3372 return err; 3373 status |= DO_SETLINK_NOTIFY; 3374 } 3375 3376 return do_setlink(skb, dev, ifm, extack, tb, ifname, status); 3377 } 3378 3379 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 3380 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 3381 return rtnl_group_changelink(skb, net, 3382 nla_get_u32(tb[IFLA_GROUP]), 3383 ifm, extack, tb); 3384 return -ENODEV; 3385 } 3386 3387 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO]) 3388 return -EOPNOTSUPP; 3389 3390 if (!ops) { 3391 #ifdef CONFIG_MODULES 3392 if (kind[0]) { 3393 __rtnl_unlock(); 3394 request_module("rtnl-link-%s", kind); 3395 rtnl_lock(); 3396 ops = rtnl_link_ops_get(kind); 3397 if (ops) 3398 goto replay; 3399 } 3400 #endif 3401 NL_SET_ERR_MSG(extack, "Unknown device type"); 3402 return -EOPNOTSUPP; 3403 } 3404 3405 if (!ops->setup) 3406 return -EOPNOTSUPP; 3407 3408 if (!ifname[0]) { 3409 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 3410 name_assign_type = NET_NAME_ENUM; 3411 } 3412 3413 dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN); 3414 if (IS_ERR(dest_net)) 3415 return PTR_ERR(dest_net); 3416 3417 if (tb[IFLA_LINK_NETNSID]) { 3418 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 3419 3420 link_net = get_net_ns_by_id(dest_net, id); 3421 if (!link_net) { 3422 NL_SET_ERR_MSG(extack, "Unknown network namespace id"); 3423 err = -EINVAL; 3424 goto out; 3425 } 3426 err = -EPERM; 3427 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 3428 goto out; 3429 } else { 3430 link_net = NULL; 3431 } 3432 3433 dev = rtnl_create_link(link_net ? : dest_net, ifname, 3434 name_assign_type, ops, tb, extack); 3435 if (IS_ERR(dev)) { 3436 err = PTR_ERR(dev); 3437 goto out; 3438 } 3439 3440 dev->ifindex = ifm->ifi_index; 3441 3442 if (ops->newlink) 3443 err = ops->newlink(link_net ? : net, dev, tb, data, extack); 3444 else 3445 err = register_netdevice(dev); 3446 if (err < 0) { 3447 free_netdev(dev); 3448 goto out; 3449 } 3450 3451 err = rtnl_configure_link(dev, ifm); 3452 if (err < 0) 3453 goto out_unregister; 3454 if (link_net) { 3455 err = dev_change_net_namespace(dev, dest_net, ifname); 3456 if (err < 0) 3457 goto out_unregister; 3458 } 3459 if (tb[IFLA_MASTER]) { 3460 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); 3461 if (err) 3462 goto out_unregister; 3463 } 3464 out: 3465 if (link_net) 3466 put_net(link_net); 3467 put_net(dest_net); 3468 return err; 3469 out_unregister: 3470 if (ops->newlink) { 3471 LIST_HEAD(list_kill); 3472 3473 ops->dellink(dev, &list_kill); 3474 unregister_netdevice_many(&list_kill); 3475 } else { 3476 unregister_netdevice(dev); 3477 } 3478 goto out; 3479 } 3480 3481 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3482 struct netlink_ext_ack *extack) 3483 { 3484 struct nlattr **attr; 3485 int ret; 3486 3487 attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL); 3488 if (!attr) 3489 return -ENOMEM; 3490 3491 ret = __rtnl_newlink(skb, nlh, attr, extack); 3492 kfree(attr); 3493 return ret; 3494 } 3495 3496 static int rtnl_valid_getlink_req(struct sk_buff *skb, 3497 const struct nlmsghdr *nlh, 3498 struct nlattr **tb, 3499 struct netlink_ext_ack *extack) 3500 { 3501 struct ifinfomsg *ifm; 3502 int i, err; 3503 3504 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 3505 NL_SET_ERR_MSG(extack, "Invalid header for get link"); 3506 return -EINVAL; 3507 } 3508 3509 if (!netlink_strict_get_check(skb)) 3510 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX, 3511 ifla_policy, extack); 3512 3513 ifm = nlmsg_data(nlh); 3514 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 3515 ifm->ifi_change) { 3516 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request"); 3517 return -EINVAL; 3518 } 3519 3520 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX, 3521 ifla_policy, extack); 3522 if (err) 3523 return err; 3524 3525 for (i = 0; i <= IFLA_MAX; i++) { 3526 if (!tb[i]) 3527 continue; 3528 3529 switch (i) { 3530 case IFLA_IFNAME: 3531 case IFLA_ALT_IFNAME: 3532 case IFLA_EXT_MASK: 3533 case IFLA_TARGET_NETNSID: 3534 break; 3535 default: 3536 NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request"); 3537 return -EINVAL; 3538 } 3539 } 3540 3541 return 0; 3542 } 3543 3544 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3545 struct netlink_ext_ack *extack) 3546 { 3547 struct net *net = sock_net(skb->sk); 3548 struct net *tgt_net = net; 3549 struct ifinfomsg *ifm; 3550 struct nlattr *tb[IFLA_MAX+1]; 3551 struct net_device *dev = NULL; 3552 struct sk_buff *nskb; 3553 int netnsid = -1; 3554 int err; 3555 u32 ext_filter_mask = 0; 3556 3557 err = rtnl_valid_getlink_req(skb, nlh, tb, extack); 3558 if (err < 0) 3559 return err; 3560 3561 err = rtnl_ensure_unique_netns(tb, extack, true); 3562 if (err < 0) 3563 return err; 3564 3565 if (tb[IFLA_TARGET_NETNSID]) { 3566 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 3567 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid); 3568 if (IS_ERR(tgt_net)) 3569 return PTR_ERR(tgt_net); 3570 } 3571 3572 if (tb[IFLA_EXT_MASK]) 3573 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 3574 3575 err = -EINVAL; 3576 ifm = nlmsg_data(nlh); 3577 if (ifm->ifi_index > 0) 3578 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 3579 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3580 dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME], 3581 tb[IFLA_ALT_IFNAME], NULL); 3582 else 3583 goto out; 3584 3585 err = -ENODEV; 3586 if (dev == NULL) 3587 goto out; 3588 3589 err = -ENOBUFS; 3590 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 3591 if (nskb == NULL) 3592 goto out; 3593 3594 err = rtnl_fill_ifinfo(nskb, dev, net, 3595 RTM_NEWLINK, NETLINK_CB(skb).portid, 3596 nlh->nlmsg_seq, 0, 0, ext_filter_mask, 3597 0, NULL, 0, netnsid, GFP_KERNEL); 3598 if (err < 0) { 3599 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 3600 WARN_ON(err == -EMSGSIZE); 3601 kfree_skb(nskb); 3602 } else 3603 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 3604 out: 3605 if (netnsid >= 0) 3606 put_net(tgt_net); 3607 3608 return err; 3609 } 3610 3611 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr, 3612 bool *changed, struct netlink_ext_ack *extack) 3613 { 3614 char *alt_ifname; 3615 int err; 3616 3617 err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack); 3618 if (err) 3619 return err; 3620 3621 alt_ifname = nla_strdup(attr, GFP_KERNEL); 3622 if (!alt_ifname) 3623 return -ENOMEM; 3624 3625 if (cmd == RTM_NEWLINKPROP) { 3626 err = netdev_name_node_alt_create(dev, alt_ifname); 3627 if (!err) 3628 alt_ifname = NULL; 3629 } else if (cmd == RTM_DELLINKPROP) { 3630 err = netdev_name_node_alt_destroy(dev, alt_ifname); 3631 } else { 3632 WARN_ON_ONCE(1); 3633 err = -EINVAL; 3634 } 3635 3636 kfree(alt_ifname); 3637 if (!err) 3638 *changed = true; 3639 return err; 3640 } 3641 3642 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh, 3643 struct netlink_ext_ack *extack) 3644 { 3645 struct net *net = sock_net(skb->sk); 3646 struct nlattr *tb[IFLA_MAX + 1]; 3647 struct net_device *dev; 3648 struct ifinfomsg *ifm; 3649 bool changed = false; 3650 struct nlattr *attr; 3651 int err, rem; 3652 3653 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack); 3654 if (err) 3655 return err; 3656 3657 err = rtnl_ensure_unique_netns(tb, extack, true); 3658 if (err) 3659 return err; 3660 3661 ifm = nlmsg_data(nlh); 3662 if (ifm->ifi_index > 0) 3663 dev = __dev_get_by_index(net, ifm->ifi_index); 3664 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) 3665 dev = rtnl_dev_get(net, tb[IFLA_IFNAME], 3666 tb[IFLA_ALT_IFNAME], NULL); 3667 else 3668 return -EINVAL; 3669 3670 if (!dev) 3671 return -ENODEV; 3672 3673 if (!tb[IFLA_PROP_LIST]) 3674 return 0; 3675 3676 nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) { 3677 switch (nla_type(attr)) { 3678 case IFLA_ALT_IFNAME: 3679 err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack); 3680 if (err) 3681 return err; 3682 break; 3683 } 3684 } 3685 3686 if (changed) 3687 netdev_state_change(dev); 3688 return 0; 3689 } 3690 3691 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh, 3692 struct netlink_ext_ack *extack) 3693 { 3694 return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack); 3695 } 3696 3697 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh, 3698 struct netlink_ext_ack *extack) 3699 { 3700 return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack); 3701 } 3702 3703 static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 3704 { 3705 struct net *net = sock_net(skb->sk); 3706 size_t min_ifinfo_dump_size = 0; 3707 struct nlattr *tb[IFLA_MAX+1]; 3708 u32 ext_filter_mask = 0; 3709 struct net_device *dev; 3710 int hdrlen; 3711 3712 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 3713 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 3714 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 3715 3716 if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) { 3717 if (tb[IFLA_EXT_MASK]) 3718 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 3719 } 3720 3721 if (!ext_filter_mask) 3722 return NLMSG_GOODSIZE; 3723 /* 3724 * traverse the list of net devices and compute the minimum 3725 * buffer size based upon the filter mask. 3726 */ 3727 rcu_read_lock(); 3728 for_each_netdev_rcu(net, dev) { 3729 min_ifinfo_dump_size = max(min_ifinfo_dump_size, 3730 if_nlmsg_size(dev, ext_filter_mask)); 3731 } 3732 rcu_read_unlock(); 3733 3734 return nlmsg_total_size(min_ifinfo_dump_size); 3735 } 3736 3737 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 3738 { 3739 int idx; 3740 int s_idx = cb->family; 3741 int type = cb->nlh->nlmsg_type - RTM_BASE; 3742 int ret = 0; 3743 3744 if (s_idx == 0) 3745 s_idx = 1; 3746 3747 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 3748 struct rtnl_link __rcu **tab; 3749 struct rtnl_link *link; 3750 rtnl_dumpit_func dumpit; 3751 3752 if (idx < s_idx || idx == PF_PACKET) 3753 continue; 3754 3755 if (type < 0 || type >= RTM_NR_MSGTYPES) 3756 continue; 3757 3758 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]); 3759 if (!tab) 3760 continue; 3761 3762 link = rcu_dereference_rtnl(tab[type]); 3763 if (!link) 3764 continue; 3765 3766 dumpit = link->dumpit; 3767 if (!dumpit) 3768 continue; 3769 3770 if (idx > s_idx) { 3771 memset(&cb->args[0], 0, sizeof(cb->args)); 3772 cb->prev_seq = 0; 3773 cb->seq = 0; 3774 } 3775 ret = dumpit(skb, cb); 3776 if (ret) 3777 break; 3778 } 3779 cb->family = idx; 3780 3781 return skb->len ? : ret; 3782 } 3783 3784 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 3785 unsigned int change, 3786 u32 event, gfp_t flags, int *new_nsid, 3787 int new_ifindex) 3788 { 3789 struct net *net = dev_net(dev); 3790 struct sk_buff *skb; 3791 int err = -ENOBUFS; 3792 size_t if_info_size; 3793 3794 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 3795 if (skb == NULL) 3796 goto errout; 3797 3798 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev), 3799 type, 0, 0, change, 0, 0, event, 3800 new_nsid, new_ifindex, -1, flags); 3801 if (err < 0) { 3802 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 3803 WARN_ON(err == -EMSGSIZE); 3804 kfree_skb(skb); 3805 goto errout; 3806 } 3807 return skb; 3808 errout: 3809 if (err < 0) 3810 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3811 return NULL; 3812 } 3813 3814 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 3815 { 3816 struct net *net = dev_net(dev); 3817 3818 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 3819 } 3820 3821 static void rtmsg_ifinfo_event(int type, struct net_device *dev, 3822 unsigned int change, u32 event, 3823 gfp_t flags, int *new_nsid, int new_ifindex) 3824 { 3825 struct sk_buff *skb; 3826 3827 if (dev->reg_state != NETREG_REGISTERED) 3828 return; 3829 3830 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid, 3831 new_ifindex); 3832 if (skb) 3833 rtmsg_ifinfo_send(skb, dev, flags); 3834 } 3835 3836 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 3837 gfp_t flags) 3838 { 3839 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 3840 NULL, 0); 3841 } 3842 3843 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 3844 gfp_t flags, int *new_nsid, int new_ifindex) 3845 { 3846 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 3847 new_nsid, new_ifindex); 3848 } 3849 3850 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 3851 struct net_device *dev, 3852 u8 *addr, u16 vid, u32 pid, u32 seq, 3853 int type, unsigned int flags, 3854 int nlflags, u16 ndm_state) 3855 { 3856 struct nlmsghdr *nlh; 3857 struct ndmsg *ndm; 3858 3859 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 3860 if (!nlh) 3861 return -EMSGSIZE; 3862 3863 ndm = nlmsg_data(nlh); 3864 ndm->ndm_family = AF_BRIDGE; 3865 ndm->ndm_pad1 = 0; 3866 ndm->ndm_pad2 = 0; 3867 ndm->ndm_flags = flags; 3868 ndm->ndm_type = 0; 3869 ndm->ndm_ifindex = dev->ifindex; 3870 ndm->ndm_state = ndm_state; 3871 3872 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 3873 goto nla_put_failure; 3874 if (vid) 3875 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 3876 goto nla_put_failure; 3877 3878 nlmsg_end(skb, nlh); 3879 return 0; 3880 3881 nla_put_failure: 3882 nlmsg_cancel(skb, nlh); 3883 return -EMSGSIZE; 3884 } 3885 3886 static inline size_t rtnl_fdb_nlmsg_size(void) 3887 { 3888 return NLMSG_ALIGN(sizeof(struct ndmsg)) + 3889 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */ 3890 nla_total_size(sizeof(u16)) + /* NDA_VLAN */ 3891 0; 3892 } 3893 3894 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 3895 u16 ndm_state) 3896 { 3897 struct net *net = dev_net(dev); 3898 struct sk_buff *skb; 3899 int err = -ENOBUFS; 3900 3901 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 3902 if (!skb) 3903 goto errout; 3904 3905 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 3906 0, 0, type, NTF_SELF, 0, ndm_state); 3907 if (err < 0) { 3908 kfree_skb(skb); 3909 goto errout; 3910 } 3911 3912 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 3913 return; 3914 errout: 3915 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 3916 } 3917 3918 /* 3919 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 3920 */ 3921 int ndo_dflt_fdb_add(struct ndmsg *ndm, 3922 struct nlattr *tb[], 3923 struct net_device *dev, 3924 const unsigned char *addr, u16 vid, 3925 u16 flags) 3926 { 3927 int err = -EINVAL; 3928 3929 /* If aging addresses are supported device will need to 3930 * implement its own handler for this. 3931 */ 3932 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 3933 pr_info("%s: FDB only supports static addresses\n", dev->name); 3934 return err; 3935 } 3936 3937 if (vid) { 3938 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 3939 return err; 3940 } 3941 3942 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 3943 err = dev_uc_add_excl(dev, addr); 3944 else if (is_multicast_ether_addr(addr)) 3945 err = dev_mc_add_excl(dev, addr); 3946 3947 /* Only return duplicate errors if NLM_F_EXCL is set */ 3948 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 3949 err = 0; 3950 3951 return err; 3952 } 3953 EXPORT_SYMBOL(ndo_dflt_fdb_add); 3954 3955 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid, 3956 struct netlink_ext_ack *extack) 3957 { 3958 u16 vid = 0; 3959 3960 if (vlan_attr) { 3961 if (nla_len(vlan_attr) != sizeof(u16)) { 3962 NL_SET_ERR_MSG(extack, "invalid vlan attribute size"); 3963 return -EINVAL; 3964 } 3965 3966 vid = nla_get_u16(vlan_attr); 3967 3968 if (!vid || vid >= VLAN_VID_MASK) { 3969 NL_SET_ERR_MSG(extack, "invalid vlan id"); 3970 return -EINVAL; 3971 } 3972 } 3973 *p_vid = vid; 3974 return 0; 3975 } 3976 3977 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, 3978 struct netlink_ext_ack *extack) 3979 { 3980 struct net *net = sock_net(skb->sk); 3981 struct ndmsg *ndm; 3982 struct nlattr *tb[NDA_MAX+1]; 3983 struct net_device *dev; 3984 u8 *addr; 3985 u16 vid; 3986 int err; 3987 3988 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, 3989 extack); 3990 if (err < 0) 3991 return err; 3992 3993 ndm = nlmsg_data(nlh); 3994 if (ndm->ndm_ifindex == 0) { 3995 NL_SET_ERR_MSG(extack, "invalid ifindex"); 3996 return -EINVAL; 3997 } 3998 3999 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 4000 if (dev == NULL) { 4001 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4002 return -ENODEV; 4003 } 4004 4005 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 4006 NL_SET_ERR_MSG(extack, "invalid address"); 4007 return -EINVAL; 4008 } 4009 4010 if (dev->type != ARPHRD_ETHER) { 4011 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices"); 4012 return -EINVAL; 4013 } 4014 4015 addr = nla_data(tb[NDA_LLADDR]); 4016 4017 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 4018 if (err) 4019 return err; 4020 4021 err = -EOPNOTSUPP; 4022 4023 /* Support fdb on master device the net/bridge default case */ 4024 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 4025 netif_is_bridge_port(dev)) { 4026 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4027 const struct net_device_ops *ops = br_dev->netdev_ops; 4028 4029 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 4030 nlh->nlmsg_flags, extack); 4031 if (err) 4032 goto out; 4033 else 4034 ndm->ndm_flags &= ~NTF_MASTER; 4035 } 4036 4037 /* Embedded bridge, macvlan, and any other device support */ 4038 if ((ndm->ndm_flags & NTF_SELF)) { 4039 if (dev->netdev_ops->ndo_fdb_add) 4040 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 4041 vid, 4042 nlh->nlmsg_flags, 4043 extack); 4044 else 4045 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 4046 nlh->nlmsg_flags); 4047 4048 if (!err) { 4049 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 4050 ndm->ndm_state); 4051 ndm->ndm_flags &= ~NTF_SELF; 4052 } 4053 } 4054 out: 4055 return err; 4056 } 4057 4058 /* 4059 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 4060 */ 4061 int ndo_dflt_fdb_del(struct ndmsg *ndm, 4062 struct nlattr *tb[], 4063 struct net_device *dev, 4064 const unsigned char *addr, u16 vid) 4065 { 4066 int err = -EINVAL; 4067 4068 /* If aging addresses are supported device will need to 4069 * implement its own handler for this. 4070 */ 4071 if (!(ndm->ndm_state & NUD_PERMANENT)) { 4072 pr_info("%s: FDB only supports static addresses\n", dev->name); 4073 return err; 4074 } 4075 4076 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 4077 err = dev_uc_del(dev, addr); 4078 else if (is_multicast_ether_addr(addr)) 4079 err = dev_mc_del(dev, addr); 4080 4081 return err; 4082 } 4083 EXPORT_SYMBOL(ndo_dflt_fdb_del); 4084 4085 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, 4086 struct netlink_ext_ack *extack) 4087 { 4088 struct net *net = sock_net(skb->sk); 4089 struct ndmsg *ndm; 4090 struct nlattr *tb[NDA_MAX+1]; 4091 struct net_device *dev; 4092 __u8 *addr; 4093 int err; 4094 u16 vid; 4095 4096 if (!netlink_capable(skb, CAP_NET_ADMIN)) 4097 return -EPERM; 4098 4099 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, 4100 extack); 4101 if (err < 0) 4102 return err; 4103 4104 ndm = nlmsg_data(nlh); 4105 if (ndm->ndm_ifindex == 0) { 4106 NL_SET_ERR_MSG(extack, "invalid ifindex"); 4107 return -EINVAL; 4108 } 4109 4110 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 4111 if (dev == NULL) { 4112 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4113 return -ENODEV; 4114 } 4115 4116 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 4117 NL_SET_ERR_MSG(extack, "invalid address"); 4118 return -EINVAL; 4119 } 4120 4121 if (dev->type != ARPHRD_ETHER) { 4122 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices"); 4123 return -EINVAL; 4124 } 4125 4126 addr = nla_data(tb[NDA_LLADDR]); 4127 4128 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 4129 if (err) 4130 return err; 4131 4132 err = -EOPNOTSUPP; 4133 4134 /* Support fdb on master device the net/bridge default case */ 4135 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 4136 netif_is_bridge_port(dev)) { 4137 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4138 const struct net_device_ops *ops = br_dev->netdev_ops; 4139 4140 if (ops->ndo_fdb_del) 4141 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 4142 4143 if (err) 4144 goto out; 4145 else 4146 ndm->ndm_flags &= ~NTF_MASTER; 4147 } 4148 4149 /* Embedded bridge, macvlan, and any other device support */ 4150 if (ndm->ndm_flags & NTF_SELF) { 4151 if (dev->netdev_ops->ndo_fdb_del) 4152 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 4153 vid); 4154 else 4155 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 4156 4157 if (!err) { 4158 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 4159 ndm->ndm_state); 4160 ndm->ndm_flags &= ~NTF_SELF; 4161 } 4162 } 4163 out: 4164 return err; 4165 } 4166 4167 static int nlmsg_populate_fdb(struct sk_buff *skb, 4168 struct netlink_callback *cb, 4169 struct net_device *dev, 4170 int *idx, 4171 struct netdev_hw_addr_list *list) 4172 { 4173 struct netdev_hw_addr *ha; 4174 int err; 4175 u32 portid, seq; 4176 4177 portid = NETLINK_CB(cb->skb).portid; 4178 seq = cb->nlh->nlmsg_seq; 4179 4180 list_for_each_entry(ha, &list->list, list) { 4181 if (*idx < cb->args[2]) 4182 goto skip; 4183 4184 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 4185 portid, seq, 4186 RTM_NEWNEIGH, NTF_SELF, 4187 NLM_F_MULTI, NUD_PERMANENT); 4188 if (err < 0) 4189 return err; 4190 skip: 4191 *idx += 1; 4192 } 4193 return 0; 4194 } 4195 4196 /** 4197 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 4198 * @skb: socket buffer to store message in 4199 * @cb: netlink callback 4200 * @dev: netdevice 4201 * @filter_dev: ignored 4202 * @idx: the number of FDB table entries dumped is added to *@idx 4203 * 4204 * Default netdevice operation to dump the existing unicast address list. 4205 * Returns number of addresses from list put in skb. 4206 */ 4207 int ndo_dflt_fdb_dump(struct sk_buff *skb, 4208 struct netlink_callback *cb, 4209 struct net_device *dev, 4210 struct net_device *filter_dev, 4211 int *idx) 4212 { 4213 int err; 4214 4215 if (dev->type != ARPHRD_ETHER) 4216 return -EINVAL; 4217 4218 netif_addr_lock_bh(dev); 4219 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc); 4220 if (err) 4221 goto out; 4222 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc); 4223 out: 4224 netif_addr_unlock_bh(dev); 4225 return err; 4226 } 4227 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 4228 4229 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh, 4230 int *br_idx, int *brport_idx, 4231 struct netlink_ext_ack *extack) 4232 { 4233 struct nlattr *tb[NDA_MAX + 1]; 4234 struct ndmsg *ndm; 4235 int err, i; 4236 4237 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { 4238 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request"); 4239 return -EINVAL; 4240 } 4241 4242 ndm = nlmsg_data(nlh); 4243 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || 4244 ndm->ndm_flags || ndm->ndm_type) { 4245 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request"); 4246 return -EINVAL; 4247 } 4248 4249 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, 4250 NDA_MAX, NULL, extack); 4251 if (err < 0) 4252 return err; 4253 4254 *brport_idx = ndm->ndm_ifindex; 4255 for (i = 0; i <= NDA_MAX; ++i) { 4256 if (!tb[i]) 4257 continue; 4258 4259 switch (i) { 4260 case NDA_IFINDEX: 4261 if (nla_len(tb[i]) != sizeof(u32)) { 4262 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request"); 4263 return -EINVAL; 4264 } 4265 *brport_idx = nla_get_u32(tb[NDA_IFINDEX]); 4266 break; 4267 case NDA_MASTER: 4268 if (nla_len(tb[i]) != sizeof(u32)) { 4269 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request"); 4270 return -EINVAL; 4271 } 4272 *br_idx = nla_get_u32(tb[NDA_MASTER]); 4273 break; 4274 default: 4275 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request"); 4276 return -EINVAL; 4277 } 4278 } 4279 4280 return 0; 4281 } 4282 4283 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh, 4284 int *br_idx, int *brport_idx, 4285 struct netlink_ext_ack *extack) 4286 { 4287 struct nlattr *tb[IFLA_MAX+1]; 4288 int err; 4289 4290 /* A hack to preserve kernel<->userspace interface. 4291 * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0. 4292 * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails. 4293 * So, check for ndmsg with an optional u32 attribute (not used here). 4294 * Fortunately these sizes don't conflict with the size of ifinfomsg 4295 * with an optional attribute. 4296 */ 4297 if (nlmsg_len(nlh) != sizeof(struct ndmsg) && 4298 (nlmsg_len(nlh) != sizeof(struct ndmsg) + 4299 nla_attr_size(sizeof(u32)))) { 4300 struct ifinfomsg *ifm; 4301 4302 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg), 4303 tb, IFLA_MAX, ifla_policy, 4304 extack); 4305 if (err < 0) { 4306 return -EINVAL; 4307 } else if (err == 0) { 4308 if (tb[IFLA_MASTER]) 4309 *br_idx = nla_get_u32(tb[IFLA_MASTER]); 4310 } 4311 4312 ifm = nlmsg_data(nlh); 4313 *brport_idx = ifm->ifi_index; 4314 } 4315 return 0; 4316 } 4317 4318 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 4319 { 4320 struct net_device *dev; 4321 struct net_device *br_dev = NULL; 4322 const struct net_device_ops *ops = NULL; 4323 const struct net_device_ops *cops = NULL; 4324 struct net *net = sock_net(skb->sk); 4325 struct hlist_head *head; 4326 int brport_idx = 0; 4327 int br_idx = 0; 4328 int h, s_h; 4329 int idx = 0, s_idx; 4330 int err = 0; 4331 int fidx = 0; 4332 4333 if (cb->strict_check) 4334 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx, 4335 cb->extack); 4336 else 4337 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx, 4338 cb->extack); 4339 if (err < 0) 4340 return err; 4341 4342 if (br_idx) { 4343 br_dev = __dev_get_by_index(net, br_idx); 4344 if (!br_dev) 4345 return -ENODEV; 4346 4347 ops = br_dev->netdev_ops; 4348 } 4349 4350 s_h = cb->args[0]; 4351 s_idx = cb->args[1]; 4352 4353 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4354 idx = 0; 4355 head = &net->dev_index_head[h]; 4356 hlist_for_each_entry(dev, head, index_hlist) { 4357 4358 if (brport_idx && (dev->ifindex != brport_idx)) 4359 continue; 4360 4361 if (!br_idx) { /* user did not specify a specific bridge */ 4362 if (netif_is_bridge_port(dev)) { 4363 br_dev = netdev_master_upper_dev_get(dev); 4364 cops = br_dev->netdev_ops; 4365 } 4366 } else { 4367 if (dev != br_dev && 4368 !netif_is_bridge_port(dev)) 4369 continue; 4370 4371 if (br_dev != netdev_master_upper_dev_get(dev) && 4372 !(dev->priv_flags & IFF_EBRIDGE)) 4373 continue; 4374 cops = ops; 4375 } 4376 4377 if (idx < s_idx) 4378 goto cont; 4379 4380 if (netif_is_bridge_port(dev)) { 4381 if (cops && cops->ndo_fdb_dump) { 4382 err = cops->ndo_fdb_dump(skb, cb, 4383 br_dev, dev, 4384 &fidx); 4385 if (err == -EMSGSIZE) 4386 goto out; 4387 } 4388 } 4389 4390 if (dev->netdev_ops->ndo_fdb_dump) 4391 err = dev->netdev_ops->ndo_fdb_dump(skb, cb, 4392 dev, NULL, 4393 &fidx); 4394 else 4395 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, 4396 &fidx); 4397 if (err == -EMSGSIZE) 4398 goto out; 4399 4400 cops = NULL; 4401 4402 /* reset fdb offset to 0 for rest of the interfaces */ 4403 cb->args[2] = 0; 4404 fidx = 0; 4405 cont: 4406 idx++; 4407 } 4408 } 4409 4410 out: 4411 cb->args[0] = h; 4412 cb->args[1] = idx; 4413 cb->args[2] = fidx; 4414 4415 return skb->len; 4416 } 4417 4418 static int valid_fdb_get_strict(const struct nlmsghdr *nlh, 4419 struct nlattr **tb, u8 *ndm_flags, 4420 int *br_idx, int *brport_idx, u8 **addr, 4421 u16 *vid, struct netlink_ext_ack *extack) 4422 { 4423 struct ndmsg *ndm; 4424 int err, i; 4425 4426 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { 4427 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request"); 4428 return -EINVAL; 4429 } 4430 4431 ndm = nlmsg_data(nlh); 4432 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || 4433 ndm->ndm_type) { 4434 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request"); 4435 return -EINVAL; 4436 } 4437 4438 if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) { 4439 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request"); 4440 return -EINVAL; 4441 } 4442 4443 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, 4444 NDA_MAX, nda_policy, extack); 4445 if (err < 0) 4446 return err; 4447 4448 *ndm_flags = ndm->ndm_flags; 4449 *brport_idx = ndm->ndm_ifindex; 4450 for (i = 0; i <= NDA_MAX; ++i) { 4451 if (!tb[i]) 4452 continue; 4453 4454 switch (i) { 4455 case NDA_MASTER: 4456 *br_idx = nla_get_u32(tb[i]); 4457 break; 4458 case NDA_LLADDR: 4459 if (nla_len(tb[i]) != ETH_ALEN) { 4460 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request"); 4461 return -EINVAL; 4462 } 4463 *addr = nla_data(tb[i]); 4464 break; 4465 case NDA_VLAN: 4466 err = fdb_vid_parse(tb[i], vid, extack); 4467 if (err) 4468 return err; 4469 break; 4470 case NDA_VNI: 4471 break; 4472 default: 4473 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request"); 4474 return -EINVAL; 4475 } 4476 } 4477 4478 return 0; 4479 } 4480 4481 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4482 struct netlink_ext_ack *extack) 4483 { 4484 struct net_device *dev = NULL, *br_dev = NULL; 4485 const struct net_device_ops *ops = NULL; 4486 struct net *net = sock_net(in_skb->sk); 4487 struct nlattr *tb[NDA_MAX + 1]; 4488 struct sk_buff *skb; 4489 int brport_idx = 0; 4490 u8 ndm_flags = 0; 4491 int br_idx = 0; 4492 u8 *addr = NULL; 4493 u16 vid = 0; 4494 int err; 4495 4496 err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx, 4497 &brport_idx, &addr, &vid, extack); 4498 if (err < 0) 4499 return err; 4500 4501 if (!addr) { 4502 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request"); 4503 return -EINVAL; 4504 } 4505 4506 if (brport_idx) { 4507 dev = __dev_get_by_index(net, brport_idx); 4508 if (!dev) { 4509 NL_SET_ERR_MSG(extack, "Unknown device ifindex"); 4510 return -ENODEV; 4511 } 4512 } 4513 4514 if (br_idx) { 4515 if (dev) { 4516 NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive"); 4517 return -EINVAL; 4518 } 4519 4520 br_dev = __dev_get_by_index(net, br_idx); 4521 if (!br_dev) { 4522 NL_SET_ERR_MSG(extack, "Invalid master ifindex"); 4523 return -EINVAL; 4524 } 4525 ops = br_dev->netdev_ops; 4526 } 4527 4528 if (dev) { 4529 if (!ndm_flags || (ndm_flags & NTF_MASTER)) { 4530 if (!netif_is_bridge_port(dev)) { 4531 NL_SET_ERR_MSG(extack, "Device is not a bridge port"); 4532 return -EINVAL; 4533 } 4534 br_dev = netdev_master_upper_dev_get(dev); 4535 if (!br_dev) { 4536 NL_SET_ERR_MSG(extack, "Master of device not found"); 4537 return -EINVAL; 4538 } 4539 ops = br_dev->netdev_ops; 4540 } else { 4541 if (!(ndm_flags & NTF_SELF)) { 4542 NL_SET_ERR_MSG(extack, "Missing NTF_SELF"); 4543 return -EINVAL; 4544 } 4545 ops = dev->netdev_ops; 4546 } 4547 } 4548 4549 if (!br_dev && !dev) { 4550 NL_SET_ERR_MSG(extack, "No device specified"); 4551 return -ENODEV; 4552 } 4553 4554 if (!ops || !ops->ndo_fdb_get) { 4555 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device"); 4556 return -EOPNOTSUPP; 4557 } 4558 4559 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 4560 if (!skb) 4561 return -ENOBUFS; 4562 4563 if (br_dev) 4564 dev = br_dev; 4565 err = ops->ndo_fdb_get(skb, tb, dev, addr, vid, 4566 NETLINK_CB(in_skb).portid, 4567 nlh->nlmsg_seq, extack); 4568 if (err) 4569 goto out; 4570 4571 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4572 out: 4573 kfree_skb(skb); 4574 return err; 4575 } 4576 4577 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 4578 unsigned int attrnum, unsigned int flag) 4579 { 4580 if (mask & flag) 4581 return nla_put_u8(skb, attrnum, !!(flags & flag)); 4582 return 0; 4583 } 4584 4585 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 4586 struct net_device *dev, u16 mode, 4587 u32 flags, u32 mask, int nlflags, 4588 u32 filter_mask, 4589 int (*vlan_fill)(struct sk_buff *skb, 4590 struct net_device *dev, 4591 u32 filter_mask)) 4592 { 4593 struct nlmsghdr *nlh; 4594 struct ifinfomsg *ifm; 4595 struct nlattr *br_afspec; 4596 struct nlattr *protinfo; 4597 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 4598 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4599 int err = 0; 4600 4601 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 4602 if (nlh == NULL) 4603 return -EMSGSIZE; 4604 4605 ifm = nlmsg_data(nlh); 4606 ifm->ifi_family = AF_BRIDGE; 4607 ifm->__ifi_pad = 0; 4608 ifm->ifi_type = dev->type; 4609 ifm->ifi_index = dev->ifindex; 4610 ifm->ifi_flags = dev_get_flags(dev); 4611 ifm->ifi_change = 0; 4612 4613 4614 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4615 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4616 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 4617 (br_dev && 4618 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 4619 (dev->addr_len && 4620 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4621 (dev->ifindex != dev_get_iflink(dev) && 4622 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 4623 goto nla_put_failure; 4624 4625 br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC); 4626 if (!br_afspec) 4627 goto nla_put_failure; 4628 4629 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 4630 nla_nest_cancel(skb, br_afspec); 4631 goto nla_put_failure; 4632 } 4633 4634 if (mode != BRIDGE_MODE_UNDEF) { 4635 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 4636 nla_nest_cancel(skb, br_afspec); 4637 goto nla_put_failure; 4638 } 4639 } 4640 if (vlan_fill) { 4641 err = vlan_fill(skb, dev, filter_mask); 4642 if (err) { 4643 nla_nest_cancel(skb, br_afspec); 4644 goto nla_put_failure; 4645 } 4646 } 4647 nla_nest_end(skb, br_afspec); 4648 4649 protinfo = nla_nest_start(skb, IFLA_PROTINFO); 4650 if (!protinfo) 4651 goto nla_put_failure; 4652 4653 if (brport_nla_put_flag(skb, flags, mask, 4654 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 4655 brport_nla_put_flag(skb, flags, mask, 4656 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 4657 brport_nla_put_flag(skb, flags, mask, 4658 IFLA_BRPORT_FAST_LEAVE, 4659 BR_MULTICAST_FAST_LEAVE) || 4660 brport_nla_put_flag(skb, flags, mask, 4661 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 4662 brport_nla_put_flag(skb, flags, mask, 4663 IFLA_BRPORT_LEARNING, BR_LEARNING) || 4664 brport_nla_put_flag(skb, flags, mask, 4665 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 4666 brport_nla_put_flag(skb, flags, mask, 4667 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 4668 brport_nla_put_flag(skb, flags, mask, 4669 IFLA_BRPORT_PROXYARP, BR_PROXYARP) || 4670 brport_nla_put_flag(skb, flags, mask, 4671 IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) || 4672 brport_nla_put_flag(skb, flags, mask, 4673 IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) { 4674 nla_nest_cancel(skb, protinfo); 4675 goto nla_put_failure; 4676 } 4677 4678 nla_nest_end(skb, protinfo); 4679 4680 nlmsg_end(skb, nlh); 4681 return 0; 4682 nla_put_failure: 4683 nlmsg_cancel(skb, nlh); 4684 return err ? err : -EMSGSIZE; 4685 } 4686 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 4687 4688 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh, 4689 bool strict_check, u32 *filter_mask, 4690 struct netlink_ext_ack *extack) 4691 { 4692 struct nlattr *tb[IFLA_MAX+1]; 4693 int err, i; 4694 4695 if (strict_check) { 4696 struct ifinfomsg *ifm; 4697 4698 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 4699 NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump"); 4700 return -EINVAL; 4701 } 4702 4703 ifm = nlmsg_data(nlh); 4704 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 4705 ifm->ifi_change || ifm->ifi_index) { 4706 NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request"); 4707 return -EINVAL; 4708 } 4709 4710 err = nlmsg_parse_deprecated_strict(nlh, 4711 sizeof(struct ifinfomsg), 4712 tb, IFLA_MAX, ifla_policy, 4713 extack); 4714 } else { 4715 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg), 4716 tb, IFLA_MAX, ifla_policy, 4717 extack); 4718 } 4719 if (err < 0) 4720 return err; 4721 4722 /* new attributes should only be added with strict checking */ 4723 for (i = 0; i <= IFLA_MAX; ++i) { 4724 if (!tb[i]) 4725 continue; 4726 4727 switch (i) { 4728 case IFLA_EXT_MASK: 4729 *filter_mask = nla_get_u32(tb[i]); 4730 break; 4731 default: 4732 if (strict_check) { 4733 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request"); 4734 return -EINVAL; 4735 } 4736 } 4737 } 4738 4739 return 0; 4740 } 4741 4742 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 4743 { 4744 const struct nlmsghdr *nlh = cb->nlh; 4745 struct net *net = sock_net(skb->sk); 4746 struct net_device *dev; 4747 int idx = 0; 4748 u32 portid = NETLINK_CB(cb->skb).portid; 4749 u32 seq = nlh->nlmsg_seq; 4750 u32 filter_mask = 0; 4751 int err; 4752 4753 err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask, 4754 cb->extack); 4755 if (err < 0 && cb->strict_check) 4756 return err; 4757 4758 rcu_read_lock(); 4759 for_each_netdev_rcu(net, dev) { 4760 const struct net_device_ops *ops = dev->netdev_ops; 4761 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4762 4763 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 4764 if (idx >= cb->args[0]) { 4765 err = br_dev->netdev_ops->ndo_bridge_getlink( 4766 skb, portid, seq, dev, 4767 filter_mask, NLM_F_MULTI); 4768 if (err < 0 && err != -EOPNOTSUPP) { 4769 if (likely(skb->len)) 4770 break; 4771 4772 goto out_err; 4773 } 4774 } 4775 idx++; 4776 } 4777 4778 if (ops->ndo_bridge_getlink) { 4779 if (idx >= cb->args[0]) { 4780 err = ops->ndo_bridge_getlink(skb, portid, 4781 seq, dev, 4782 filter_mask, 4783 NLM_F_MULTI); 4784 if (err < 0 && err != -EOPNOTSUPP) { 4785 if (likely(skb->len)) 4786 break; 4787 4788 goto out_err; 4789 } 4790 } 4791 idx++; 4792 } 4793 } 4794 err = skb->len; 4795 out_err: 4796 rcu_read_unlock(); 4797 cb->args[0] = idx; 4798 4799 return err; 4800 } 4801 4802 static inline size_t bridge_nlmsg_size(void) 4803 { 4804 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4805 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4806 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4807 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 4808 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 4809 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 4810 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 4811 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 4812 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 4813 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 4814 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 4815 } 4816 4817 static int rtnl_bridge_notify(struct net_device *dev) 4818 { 4819 struct net *net = dev_net(dev); 4820 struct sk_buff *skb; 4821 int err = -EOPNOTSUPP; 4822 4823 if (!dev->netdev_ops->ndo_bridge_getlink) 4824 return 0; 4825 4826 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 4827 if (!skb) { 4828 err = -ENOMEM; 4829 goto errout; 4830 } 4831 4832 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 4833 if (err < 0) 4834 goto errout; 4835 4836 if (!skb->len) 4837 goto errout; 4838 4839 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 4840 return 0; 4841 errout: 4842 WARN_ON(err == -EMSGSIZE); 4843 kfree_skb(skb); 4844 if (err) 4845 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 4846 return err; 4847 } 4848 4849 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 4850 struct netlink_ext_ack *extack) 4851 { 4852 struct net *net = sock_net(skb->sk); 4853 struct ifinfomsg *ifm; 4854 struct net_device *dev; 4855 struct nlattr *br_spec, *attr = NULL; 4856 int rem, err = -EOPNOTSUPP; 4857 u16 flags = 0; 4858 bool have_flags = false; 4859 4860 if (nlmsg_len(nlh) < sizeof(*ifm)) 4861 return -EINVAL; 4862 4863 ifm = nlmsg_data(nlh); 4864 if (ifm->ifi_family != AF_BRIDGE) 4865 return -EPFNOSUPPORT; 4866 4867 dev = __dev_get_by_index(net, ifm->ifi_index); 4868 if (!dev) { 4869 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4870 return -ENODEV; 4871 } 4872 4873 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 4874 if (br_spec) { 4875 nla_for_each_nested(attr, br_spec, rem) { 4876 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 4877 if (nla_len(attr) < sizeof(flags)) 4878 return -EINVAL; 4879 4880 have_flags = true; 4881 flags = nla_get_u16(attr); 4882 break; 4883 } 4884 } 4885 } 4886 4887 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 4888 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4889 4890 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 4891 err = -EOPNOTSUPP; 4892 goto out; 4893 } 4894 4895 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags, 4896 extack); 4897 if (err) 4898 goto out; 4899 4900 flags &= ~BRIDGE_FLAGS_MASTER; 4901 } 4902 4903 if ((flags & BRIDGE_FLAGS_SELF)) { 4904 if (!dev->netdev_ops->ndo_bridge_setlink) 4905 err = -EOPNOTSUPP; 4906 else 4907 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 4908 flags, 4909 extack); 4910 if (!err) { 4911 flags &= ~BRIDGE_FLAGS_SELF; 4912 4913 /* Generate event to notify upper layer of bridge 4914 * change 4915 */ 4916 err = rtnl_bridge_notify(dev); 4917 } 4918 } 4919 4920 if (have_flags) 4921 memcpy(nla_data(attr), &flags, sizeof(flags)); 4922 out: 4923 return err; 4924 } 4925 4926 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 4927 struct netlink_ext_ack *extack) 4928 { 4929 struct net *net = sock_net(skb->sk); 4930 struct ifinfomsg *ifm; 4931 struct net_device *dev; 4932 struct nlattr *br_spec, *attr = NULL; 4933 int rem, err = -EOPNOTSUPP; 4934 u16 flags = 0; 4935 bool have_flags = false; 4936 4937 if (nlmsg_len(nlh) < sizeof(*ifm)) 4938 return -EINVAL; 4939 4940 ifm = nlmsg_data(nlh); 4941 if (ifm->ifi_family != AF_BRIDGE) 4942 return -EPFNOSUPPORT; 4943 4944 dev = __dev_get_by_index(net, ifm->ifi_index); 4945 if (!dev) { 4946 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4947 return -ENODEV; 4948 } 4949 4950 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 4951 if (br_spec) { 4952 nla_for_each_nested(attr, br_spec, rem) { 4953 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 4954 if (nla_len(attr) < sizeof(flags)) 4955 return -EINVAL; 4956 4957 have_flags = true; 4958 flags = nla_get_u16(attr); 4959 break; 4960 } 4961 } 4962 } 4963 4964 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 4965 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4966 4967 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 4968 err = -EOPNOTSUPP; 4969 goto out; 4970 } 4971 4972 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 4973 if (err) 4974 goto out; 4975 4976 flags &= ~BRIDGE_FLAGS_MASTER; 4977 } 4978 4979 if ((flags & BRIDGE_FLAGS_SELF)) { 4980 if (!dev->netdev_ops->ndo_bridge_dellink) 4981 err = -EOPNOTSUPP; 4982 else 4983 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 4984 flags); 4985 4986 if (!err) { 4987 flags &= ~BRIDGE_FLAGS_SELF; 4988 4989 /* Generate event to notify upper layer of bridge 4990 * change 4991 */ 4992 err = rtnl_bridge_notify(dev); 4993 } 4994 } 4995 4996 if (have_flags) 4997 memcpy(nla_data(attr), &flags, sizeof(flags)); 4998 out: 4999 return err; 5000 } 5001 5002 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr) 5003 { 5004 return (mask & IFLA_STATS_FILTER_BIT(attrid)) && 5005 (!idxattr || idxattr == attrid); 5006 } 5007 5008 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1) 5009 static int rtnl_get_offload_stats_attr_size(int attr_id) 5010 { 5011 switch (attr_id) { 5012 case IFLA_OFFLOAD_XSTATS_CPU_HIT: 5013 return sizeof(struct rtnl_link_stats64); 5014 } 5015 5016 return 0; 5017 } 5018 5019 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev, 5020 int *prividx) 5021 { 5022 struct nlattr *attr = NULL; 5023 int attr_id, size; 5024 void *attr_data; 5025 int err; 5026 5027 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 5028 dev->netdev_ops->ndo_get_offload_stats)) 5029 return -ENODATA; 5030 5031 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 5032 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 5033 if (attr_id < *prividx) 5034 continue; 5035 5036 size = rtnl_get_offload_stats_attr_size(attr_id); 5037 if (!size) 5038 continue; 5039 5040 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 5041 continue; 5042 5043 attr = nla_reserve_64bit(skb, attr_id, size, 5044 IFLA_OFFLOAD_XSTATS_UNSPEC); 5045 if (!attr) 5046 goto nla_put_failure; 5047 5048 attr_data = nla_data(attr); 5049 memset(attr_data, 0, size); 5050 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, 5051 attr_data); 5052 if (err) 5053 goto get_offload_stats_failure; 5054 } 5055 5056 if (!attr) 5057 return -ENODATA; 5058 5059 *prividx = 0; 5060 return 0; 5061 5062 nla_put_failure: 5063 err = -EMSGSIZE; 5064 get_offload_stats_failure: 5065 *prividx = attr_id; 5066 return err; 5067 } 5068 5069 static int rtnl_get_offload_stats_size(const struct net_device *dev) 5070 { 5071 int nla_size = 0; 5072 int attr_id; 5073 int size; 5074 5075 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 5076 dev->netdev_ops->ndo_get_offload_stats)) 5077 return 0; 5078 5079 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 5080 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 5081 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 5082 continue; 5083 size = rtnl_get_offload_stats_attr_size(attr_id); 5084 nla_size += nla_total_size_64bit(size); 5085 } 5086 5087 if (nla_size != 0) 5088 nla_size += nla_total_size(0); 5089 5090 return nla_size; 5091 } 5092 5093 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, 5094 int type, u32 pid, u32 seq, u32 change, 5095 unsigned int flags, unsigned int filter_mask, 5096 int *idxattr, int *prividx) 5097 { 5098 struct if_stats_msg *ifsm; 5099 struct nlmsghdr *nlh; 5100 struct nlattr *attr; 5101 int s_prividx = *prividx; 5102 int err; 5103 5104 ASSERT_RTNL(); 5105 5106 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags); 5107 if (!nlh) 5108 return -EMSGSIZE; 5109 5110 ifsm = nlmsg_data(nlh); 5111 ifsm->family = PF_UNSPEC; 5112 ifsm->pad1 = 0; 5113 ifsm->pad2 = 0; 5114 ifsm->ifindex = dev->ifindex; 5115 ifsm->filter_mask = filter_mask; 5116 5117 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) { 5118 struct rtnl_link_stats64 *sp; 5119 5120 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64, 5121 sizeof(struct rtnl_link_stats64), 5122 IFLA_STATS_UNSPEC); 5123 if (!attr) 5124 goto nla_put_failure; 5125 5126 sp = nla_data(attr); 5127 dev_get_stats(dev, sp); 5128 } 5129 5130 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) { 5131 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 5132 5133 if (ops && ops->fill_linkxstats) { 5134 *idxattr = IFLA_STATS_LINK_XSTATS; 5135 attr = nla_nest_start_noflag(skb, 5136 IFLA_STATS_LINK_XSTATS); 5137 if (!attr) 5138 goto nla_put_failure; 5139 5140 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 5141 nla_nest_end(skb, attr); 5142 if (err) 5143 goto nla_put_failure; 5144 *idxattr = 0; 5145 } 5146 } 5147 5148 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 5149 *idxattr)) { 5150 const struct rtnl_link_ops *ops = NULL; 5151 const struct net_device *master; 5152 5153 master = netdev_master_upper_dev_get(dev); 5154 if (master) 5155 ops = master->rtnl_link_ops; 5156 if (ops && ops->fill_linkxstats) { 5157 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE; 5158 attr = nla_nest_start_noflag(skb, 5159 IFLA_STATS_LINK_XSTATS_SLAVE); 5160 if (!attr) 5161 goto nla_put_failure; 5162 5163 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 5164 nla_nest_end(skb, attr); 5165 if (err) 5166 goto nla_put_failure; 5167 *idxattr = 0; 5168 } 5169 } 5170 5171 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 5172 *idxattr)) { 5173 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS; 5174 attr = nla_nest_start_noflag(skb, 5175 IFLA_STATS_LINK_OFFLOAD_XSTATS); 5176 if (!attr) 5177 goto nla_put_failure; 5178 5179 err = rtnl_get_offload_stats(skb, dev, prividx); 5180 if (err == -ENODATA) 5181 nla_nest_cancel(skb, attr); 5182 else 5183 nla_nest_end(skb, attr); 5184 5185 if (err && err != -ENODATA) 5186 goto nla_put_failure; 5187 *idxattr = 0; 5188 } 5189 5190 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) { 5191 struct rtnl_af_ops *af_ops; 5192 5193 *idxattr = IFLA_STATS_AF_SPEC; 5194 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC); 5195 if (!attr) 5196 goto nla_put_failure; 5197 5198 rcu_read_lock(); 5199 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 5200 if (af_ops->fill_stats_af) { 5201 struct nlattr *af; 5202 int err; 5203 5204 af = nla_nest_start_noflag(skb, 5205 af_ops->family); 5206 if (!af) { 5207 rcu_read_unlock(); 5208 goto nla_put_failure; 5209 } 5210 err = af_ops->fill_stats_af(skb, dev); 5211 5212 if (err == -ENODATA) { 5213 nla_nest_cancel(skb, af); 5214 } else if (err < 0) { 5215 rcu_read_unlock(); 5216 goto nla_put_failure; 5217 } 5218 5219 nla_nest_end(skb, af); 5220 } 5221 } 5222 rcu_read_unlock(); 5223 5224 nla_nest_end(skb, attr); 5225 5226 *idxattr = 0; 5227 } 5228 5229 nlmsg_end(skb, nlh); 5230 5231 return 0; 5232 5233 nla_put_failure: 5234 /* not a multi message or no progress mean a real error */ 5235 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx) 5236 nlmsg_cancel(skb, nlh); 5237 else 5238 nlmsg_end(skb, nlh); 5239 5240 return -EMSGSIZE; 5241 } 5242 5243 static size_t if_nlmsg_stats_size(const struct net_device *dev, 5244 u32 filter_mask) 5245 { 5246 size_t size = 0; 5247 5248 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0)) 5249 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64)); 5250 5251 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) { 5252 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 5253 int attr = IFLA_STATS_LINK_XSTATS; 5254 5255 if (ops && ops->get_linkxstats_size) { 5256 size += nla_total_size(ops->get_linkxstats_size(dev, 5257 attr)); 5258 /* for IFLA_STATS_LINK_XSTATS */ 5259 size += nla_total_size(0); 5260 } 5261 } 5262 5263 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) { 5264 struct net_device *_dev = (struct net_device *)dev; 5265 const struct rtnl_link_ops *ops = NULL; 5266 const struct net_device *master; 5267 5268 /* netdev_master_upper_dev_get can't take const */ 5269 master = netdev_master_upper_dev_get(_dev); 5270 if (master) 5271 ops = master->rtnl_link_ops; 5272 if (ops && ops->get_linkxstats_size) { 5273 int attr = IFLA_STATS_LINK_XSTATS_SLAVE; 5274 5275 size += nla_total_size(ops->get_linkxstats_size(dev, 5276 attr)); 5277 /* for IFLA_STATS_LINK_XSTATS_SLAVE */ 5278 size += nla_total_size(0); 5279 } 5280 } 5281 5282 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) 5283 size += rtnl_get_offload_stats_size(dev); 5284 5285 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) { 5286 struct rtnl_af_ops *af_ops; 5287 5288 /* for IFLA_STATS_AF_SPEC */ 5289 size += nla_total_size(0); 5290 5291 rcu_read_lock(); 5292 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 5293 if (af_ops->get_stats_af_size) { 5294 size += nla_total_size( 5295 af_ops->get_stats_af_size(dev)); 5296 5297 /* for AF_* */ 5298 size += nla_total_size(0); 5299 } 5300 } 5301 rcu_read_unlock(); 5302 } 5303 5304 return size; 5305 } 5306 5307 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check, 5308 bool is_dump, struct netlink_ext_ack *extack) 5309 { 5310 struct if_stats_msg *ifsm; 5311 5312 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) { 5313 NL_SET_ERR_MSG(extack, "Invalid header for stats dump"); 5314 return -EINVAL; 5315 } 5316 5317 if (!strict_check) 5318 return 0; 5319 5320 ifsm = nlmsg_data(nlh); 5321 5322 /* only requests using strict checks can pass data to influence 5323 * the dump. The legacy exception is filter_mask. 5324 */ 5325 if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) { 5326 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request"); 5327 return -EINVAL; 5328 } 5329 if (nlmsg_attrlen(nlh, sizeof(*ifsm))) { 5330 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header"); 5331 return -EINVAL; 5332 } 5333 if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) { 5334 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask"); 5335 return -EINVAL; 5336 } 5337 5338 return 0; 5339 } 5340 5341 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh, 5342 struct netlink_ext_ack *extack) 5343 { 5344 struct net *net = sock_net(skb->sk); 5345 struct net_device *dev = NULL; 5346 int idxattr = 0, prividx = 0; 5347 struct if_stats_msg *ifsm; 5348 struct sk_buff *nskb; 5349 u32 filter_mask; 5350 int err; 5351 5352 err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb), 5353 false, extack); 5354 if (err) 5355 return err; 5356 5357 ifsm = nlmsg_data(nlh); 5358 if (ifsm->ifindex > 0) 5359 dev = __dev_get_by_index(net, ifsm->ifindex); 5360 else 5361 return -EINVAL; 5362 5363 if (!dev) 5364 return -ENODEV; 5365 5366 filter_mask = ifsm->filter_mask; 5367 if (!filter_mask) 5368 return -EINVAL; 5369 5370 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL); 5371 if (!nskb) 5372 return -ENOBUFS; 5373 5374 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS, 5375 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 5376 0, filter_mask, &idxattr, &prividx); 5377 if (err < 0) { 5378 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */ 5379 WARN_ON(err == -EMSGSIZE); 5380 kfree_skb(nskb); 5381 } else { 5382 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 5383 } 5384 5385 return err; 5386 } 5387 5388 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb) 5389 { 5390 struct netlink_ext_ack *extack = cb->extack; 5391 int h, s_h, err, s_idx, s_idxattr, s_prividx; 5392 struct net *net = sock_net(skb->sk); 5393 unsigned int flags = NLM_F_MULTI; 5394 struct if_stats_msg *ifsm; 5395 struct hlist_head *head; 5396 struct net_device *dev; 5397 u32 filter_mask = 0; 5398 int idx = 0; 5399 5400 s_h = cb->args[0]; 5401 s_idx = cb->args[1]; 5402 s_idxattr = cb->args[2]; 5403 s_prividx = cb->args[3]; 5404 5405 cb->seq = net->dev_base_seq; 5406 5407 err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack); 5408 if (err) 5409 return err; 5410 5411 ifsm = nlmsg_data(cb->nlh); 5412 filter_mask = ifsm->filter_mask; 5413 if (!filter_mask) { 5414 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump"); 5415 return -EINVAL; 5416 } 5417 5418 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5419 idx = 0; 5420 head = &net->dev_index_head[h]; 5421 hlist_for_each_entry(dev, head, index_hlist) { 5422 if (idx < s_idx) 5423 goto cont; 5424 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 5425 NETLINK_CB(cb->skb).portid, 5426 cb->nlh->nlmsg_seq, 0, 5427 flags, filter_mask, 5428 &s_idxattr, &s_prividx); 5429 /* If we ran out of room on the first message, 5430 * we're in trouble 5431 */ 5432 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 5433 5434 if (err < 0) 5435 goto out; 5436 s_prividx = 0; 5437 s_idxattr = 0; 5438 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5439 cont: 5440 idx++; 5441 } 5442 } 5443 out: 5444 cb->args[3] = s_prividx; 5445 cb->args[2] = s_idxattr; 5446 cb->args[1] = idx; 5447 cb->args[0] = h; 5448 5449 return skb->len; 5450 } 5451 5452 /* Process one rtnetlink message. */ 5453 5454 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 5455 struct netlink_ext_ack *extack) 5456 { 5457 struct net *net = sock_net(skb->sk); 5458 struct rtnl_link *link; 5459 struct module *owner; 5460 int err = -EOPNOTSUPP; 5461 rtnl_doit_func doit; 5462 unsigned int flags; 5463 int kind; 5464 int family; 5465 int type; 5466 5467 type = nlh->nlmsg_type; 5468 if (type > RTM_MAX) 5469 return -EOPNOTSUPP; 5470 5471 type -= RTM_BASE; 5472 5473 /* All the messages must have at least 1 byte length */ 5474 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 5475 return 0; 5476 5477 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 5478 kind = type&3; 5479 5480 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 5481 return -EPERM; 5482 5483 rcu_read_lock(); 5484 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 5485 struct sock *rtnl; 5486 rtnl_dumpit_func dumpit; 5487 u32 min_dump_alloc = 0; 5488 5489 link = rtnl_get_link(family, type); 5490 if (!link || !link->dumpit) { 5491 family = PF_UNSPEC; 5492 link = rtnl_get_link(family, type); 5493 if (!link || !link->dumpit) 5494 goto err_unlock; 5495 } 5496 owner = link->owner; 5497 dumpit = link->dumpit; 5498 5499 if (type == RTM_GETLINK - RTM_BASE) 5500 min_dump_alloc = rtnl_calcit(skb, nlh); 5501 5502 err = 0; 5503 /* need to do this before rcu_read_unlock() */ 5504 if (!try_module_get(owner)) 5505 err = -EPROTONOSUPPORT; 5506 5507 rcu_read_unlock(); 5508 5509 rtnl = net->rtnl; 5510 if (err == 0) { 5511 struct netlink_dump_control c = { 5512 .dump = dumpit, 5513 .min_dump_alloc = min_dump_alloc, 5514 .module = owner, 5515 }; 5516 err = netlink_dump_start(rtnl, skb, nlh, &c); 5517 /* netlink_dump_start() will keep a reference on 5518 * module if dump is still in progress. 5519 */ 5520 module_put(owner); 5521 } 5522 return err; 5523 } 5524 5525 link = rtnl_get_link(family, type); 5526 if (!link || !link->doit) { 5527 family = PF_UNSPEC; 5528 link = rtnl_get_link(PF_UNSPEC, type); 5529 if (!link || !link->doit) 5530 goto out_unlock; 5531 } 5532 5533 owner = link->owner; 5534 if (!try_module_get(owner)) { 5535 err = -EPROTONOSUPPORT; 5536 goto out_unlock; 5537 } 5538 5539 flags = link->flags; 5540 if (flags & RTNL_FLAG_DOIT_UNLOCKED) { 5541 doit = link->doit; 5542 rcu_read_unlock(); 5543 if (doit) 5544 err = doit(skb, nlh, extack); 5545 module_put(owner); 5546 return err; 5547 } 5548 rcu_read_unlock(); 5549 5550 rtnl_lock(); 5551 link = rtnl_get_link(family, type); 5552 if (link && link->doit) 5553 err = link->doit(skb, nlh, extack); 5554 rtnl_unlock(); 5555 5556 module_put(owner); 5557 5558 return err; 5559 5560 out_unlock: 5561 rcu_read_unlock(); 5562 return err; 5563 5564 err_unlock: 5565 rcu_read_unlock(); 5566 return -EOPNOTSUPP; 5567 } 5568 5569 static void rtnetlink_rcv(struct sk_buff *skb) 5570 { 5571 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 5572 } 5573 5574 static int rtnetlink_bind(struct net *net, int group) 5575 { 5576 switch (group) { 5577 case RTNLGRP_IPV4_MROUTE_R: 5578 case RTNLGRP_IPV6_MROUTE_R: 5579 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 5580 return -EPERM; 5581 break; 5582 } 5583 return 0; 5584 } 5585 5586 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 5587 { 5588 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 5589 5590 switch (event) { 5591 case NETDEV_REBOOT: 5592 case NETDEV_CHANGEMTU: 5593 case NETDEV_CHANGEADDR: 5594 case NETDEV_CHANGENAME: 5595 case NETDEV_FEAT_CHANGE: 5596 case NETDEV_BONDING_FAILOVER: 5597 case NETDEV_POST_TYPE_CHANGE: 5598 case NETDEV_NOTIFY_PEERS: 5599 case NETDEV_CHANGEUPPER: 5600 case NETDEV_RESEND_IGMP: 5601 case NETDEV_CHANGEINFODATA: 5602 case NETDEV_CHANGELOWERSTATE: 5603 case NETDEV_CHANGE_TX_QUEUE_LEN: 5604 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event), 5605 GFP_KERNEL, NULL, 0); 5606 break; 5607 default: 5608 break; 5609 } 5610 return NOTIFY_DONE; 5611 } 5612 5613 static struct notifier_block rtnetlink_dev_notifier = { 5614 .notifier_call = rtnetlink_event, 5615 }; 5616 5617 5618 static int __net_init rtnetlink_net_init(struct net *net) 5619 { 5620 struct sock *sk; 5621 struct netlink_kernel_cfg cfg = { 5622 .groups = RTNLGRP_MAX, 5623 .input = rtnetlink_rcv, 5624 .cb_mutex = &rtnl_mutex, 5625 .flags = NL_CFG_F_NONROOT_RECV, 5626 .bind = rtnetlink_bind, 5627 }; 5628 5629 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 5630 if (!sk) 5631 return -ENOMEM; 5632 net->rtnl = sk; 5633 return 0; 5634 } 5635 5636 static void __net_exit rtnetlink_net_exit(struct net *net) 5637 { 5638 netlink_kernel_release(net->rtnl); 5639 net->rtnl = NULL; 5640 } 5641 5642 static struct pernet_operations rtnetlink_net_ops = { 5643 .init = rtnetlink_net_init, 5644 .exit = rtnetlink_net_exit, 5645 }; 5646 5647 void __init rtnetlink_init(void) 5648 { 5649 if (register_pernet_subsys(&rtnetlink_net_ops)) 5650 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 5651 5652 register_netdevice_notifier(&rtnetlink_dev_notifier); 5653 5654 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 5655 rtnl_dump_ifinfo, 0); 5656 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0); 5657 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0); 5658 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0); 5659 5660 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0); 5661 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0); 5662 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0); 5663 5664 rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0); 5665 rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0); 5666 5667 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0); 5668 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0); 5669 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0); 5670 5671 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0); 5672 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0); 5673 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0); 5674 5675 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump, 5676 0); 5677 } 5678