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