1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/bitops.h> 20 #include <linux/errno.h> 21 #include <linux/module.h> 22 #include <linux/types.h> 23 #include <linux/socket.h> 24 #include <linux/kernel.h> 25 #include <linux/timer.h> 26 #include <linux/string.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/fcntl.h> 30 #include <linux/mm.h> 31 #include <linux/slab.h> 32 #include <linux/interrupt.h> 33 #include <linux/capability.h> 34 #include <linux/skbuff.h> 35 #include <linux/init.h> 36 #include <linux/security.h> 37 #include <linux/mutex.h> 38 #include <linux/if_addr.h> 39 #include <linux/if_bridge.h> 40 #include <linux/if_vlan.h> 41 #include <linux/pci.h> 42 #include <linux/etherdevice.h> 43 #include <linux/bpf.h> 44 45 #include <linux/uaccess.h> 46 47 #include <linux/inet.h> 48 #include <linux/netdevice.h> 49 #include <net/switchdev.h> 50 #include <net/ip.h> 51 #include <net/protocol.h> 52 #include <net/arp.h> 53 #include <net/route.h> 54 #include <net/udp.h> 55 #include <net/tcp.h> 56 #include <net/sock.h> 57 #include <net/pkt_sched.h> 58 #include <net/fib_rules.h> 59 #include <net/rtnetlink.h> 60 #include <net/net_namespace.h> 61 62 #define RTNL_MAX_TYPE 48 63 #define RTNL_SLAVE_MAX_TYPE 36 64 65 struct rtnl_link { 66 rtnl_doit_func doit; 67 rtnl_dumpit_func dumpit; 68 struct module *owner; 69 unsigned int flags; 70 struct rcu_head rcu; 71 }; 72 73 static DEFINE_MUTEX(rtnl_mutex); 74 75 void rtnl_lock(void) 76 { 77 mutex_lock(&rtnl_mutex); 78 } 79 EXPORT_SYMBOL(rtnl_lock); 80 81 int rtnl_lock_killable(void) 82 { 83 return mutex_lock_killable(&rtnl_mutex); 84 } 85 EXPORT_SYMBOL(rtnl_lock_killable); 86 87 static struct sk_buff *defer_kfree_skb_list; 88 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail) 89 { 90 if (head && tail) { 91 tail->next = defer_kfree_skb_list; 92 defer_kfree_skb_list = head; 93 } 94 } 95 EXPORT_SYMBOL(rtnl_kfree_skbs); 96 97 void __rtnl_unlock(void) 98 { 99 struct sk_buff *head = defer_kfree_skb_list; 100 101 defer_kfree_skb_list = NULL; 102 103 mutex_unlock(&rtnl_mutex); 104 105 while (head) { 106 struct sk_buff *next = head->next; 107 108 kfree_skb(head); 109 cond_resched(); 110 head = next; 111 } 112 } 113 114 void rtnl_unlock(void) 115 { 116 /* This fellow will unlock it for us. */ 117 netdev_run_todo(); 118 } 119 EXPORT_SYMBOL(rtnl_unlock); 120 121 int rtnl_trylock(void) 122 { 123 return mutex_trylock(&rtnl_mutex); 124 } 125 EXPORT_SYMBOL(rtnl_trylock); 126 127 int rtnl_is_locked(void) 128 { 129 return mutex_is_locked(&rtnl_mutex); 130 } 131 EXPORT_SYMBOL(rtnl_is_locked); 132 133 #ifdef CONFIG_PROVE_LOCKING 134 bool lockdep_rtnl_is_held(void) 135 { 136 return lockdep_is_held(&rtnl_mutex); 137 } 138 EXPORT_SYMBOL(lockdep_rtnl_is_held); 139 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 140 141 static struct rtnl_link *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 142 143 static inline int rtm_msgindex(int msgtype) 144 { 145 int msgindex = msgtype - RTM_BASE; 146 147 /* 148 * msgindex < 0 implies someone tried to register a netlink 149 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 150 * the message type has not been added to linux/rtnetlink.h 151 */ 152 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 153 154 return msgindex; 155 } 156 157 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype) 158 { 159 struct rtnl_link **tab; 160 161 if (protocol >= ARRAY_SIZE(rtnl_msg_handlers)) 162 protocol = PF_UNSPEC; 163 164 tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]); 165 if (!tab) 166 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]); 167 168 return tab[msgtype]; 169 } 170 171 static int rtnl_register_internal(struct module *owner, 172 int protocol, int msgtype, 173 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 174 unsigned int flags) 175 { 176 struct rtnl_link *link, *old; 177 struct rtnl_link __rcu **tab; 178 int msgindex; 179 int ret = -ENOBUFS; 180 181 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 182 msgindex = rtm_msgindex(msgtype); 183 184 rtnl_lock(); 185 tab = rtnl_msg_handlers[protocol]; 186 if (tab == NULL) { 187 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL); 188 if (!tab) 189 goto unlock; 190 191 /* ensures we see the 0 stores */ 192 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab); 193 } 194 195 old = rtnl_dereference(tab[msgindex]); 196 if (old) { 197 link = kmemdup(old, sizeof(*old), GFP_KERNEL); 198 if (!link) 199 goto unlock; 200 } else { 201 link = kzalloc(sizeof(*link), GFP_KERNEL); 202 if (!link) 203 goto unlock; 204 } 205 206 WARN_ON(link->owner && link->owner != owner); 207 link->owner = owner; 208 209 WARN_ON(doit && link->doit && link->doit != doit); 210 if (doit) 211 link->doit = doit; 212 WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit); 213 if (dumpit) 214 link->dumpit = dumpit; 215 216 link->flags |= flags; 217 218 /* publish protocol:msgtype */ 219 rcu_assign_pointer(tab[msgindex], link); 220 ret = 0; 221 if (old) 222 kfree_rcu(old, rcu); 223 unlock: 224 rtnl_unlock(); 225 return ret; 226 } 227 228 /** 229 * rtnl_register_module - Register a rtnetlink message type 230 * 231 * @owner: module registering the hook (THIS_MODULE) 232 * @protocol: Protocol family or PF_UNSPEC 233 * @msgtype: rtnetlink message type 234 * @doit: Function pointer called for each request message 235 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 236 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions 237 * 238 * Like rtnl_register, but for use by removable modules. 239 */ 240 int rtnl_register_module(struct module *owner, 241 int protocol, int msgtype, 242 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 243 unsigned int flags) 244 { 245 return rtnl_register_internal(owner, protocol, msgtype, 246 doit, dumpit, flags); 247 } 248 EXPORT_SYMBOL_GPL(rtnl_register_module); 249 250 /** 251 * rtnl_register - Register a rtnetlink message type 252 * @protocol: Protocol family or PF_UNSPEC 253 * @msgtype: rtnetlink message type 254 * @doit: Function pointer called for each request message 255 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 256 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions 257 * 258 * Registers the specified function pointers (at least one of them has 259 * to be non-NULL) to be called whenever a request message for the 260 * specified protocol family and message type is received. 261 * 262 * The special protocol family PF_UNSPEC may be used to define fallback 263 * function pointers for the case when no entry for the specific protocol 264 * family exists. 265 */ 266 void rtnl_register(int protocol, int msgtype, 267 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 268 unsigned int flags) 269 { 270 int err; 271 272 err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit, 273 flags); 274 if (err) 275 pr_err("Unable to register rtnetlink message handler, " 276 "protocol = %d, message type = %d\n", protocol, msgtype); 277 } 278 279 /** 280 * rtnl_unregister - Unregister a rtnetlink message type 281 * @protocol: Protocol family or PF_UNSPEC 282 * @msgtype: rtnetlink message type 283 * 284 * Returns 0 on success or a negative error code. 285 */ 286 int rtnl_unregister(int protocol, int msgtype) 287 { 288 struct rtnl_link **tab, *link; 289 int msgindex; 290 291 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 292 msgindex = rtm_msgindex(msgtype); 293 294 rtnl_lock(); 295 tab = rtnl_dereference(rtnl_msg_handlers[protocol]); 296 if (!tab) { 297 rtnl_unlock(); 298 return -ENOENT; 299 } 300 301 link = tab[msgindex]; 302 rcu_assign_pointer(tab[msgindex], NULL); 303 rtnl_unlock(); 304 305 kfree_rcu(link, rcu); 306 307 return 0; 308 } 309 EXPORT_SYMBOL_GPL(rtnl_unregister); 310 311 /** 312 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 313 * @protocol : Protocol family or PF_UNSPEC 314 * 315 * Identical to calling rtnl_unregster() for all registered message types 316 * of a certain protocol family. 317 */ 318 void rtnl_unregister_all(int protocol) 319 { 320 struct rtnl_link **tab, *link; 321 int msgindex; 322 323 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 324 325 rtnl_lock(); 326 tab = rtnl_msg_handlers[protocol]; 327 if (!tab) { 328 rtnl_unlock(); 329 return; 330 } 331 RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL); 332 for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) { 333 link = tab[msgindex]; 334 if (!link) 335 continue; 336 337 rcu_assign_pointer(tab[msgindex], NULL); 338 kfree_rcu(link, rcu); 339 } 340 rtnl_unlock(); 341 342 synchronize_net(); 343 344 kfree(tab); 345 } 346 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 347 348 static LIST_HEAD(link_ops); 349 350 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 351 { 352 const struct rtnl_link_ops *ops; 353 354 list_for_each_entry(ops, &link_ops, list) { 355 if (!strcmp(ops->kind, kind)) 356 return ops; 357 } 358 return NULL; 359 } 360 361 /** 362 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 363 * @ops: struct rtnl_link_ops * to register 364 * 365 * The caller must hold the rtnl_mutex. This function should be used 366 * by drivers that create devices during module initialization. It 367 * must be called before registering the devices. 368 * 369 * Returns 0 on success or a negative error code. 370 */ 371 int __rtnl_link_register(struct rtnl_link_ops *ops) 372 { 373 if (rtnl_link_ops_get(ops->kind)) 374 return -EEXIST; 375 376 /* The check for setup is here because if ops 377 * does not have that filled up, it is not possible 378 * to use the ops for creating device. So do not 379 * fill up dellink as well. That disables rtnl_dellink. 380 */ 381 if (ops->setup && !ops->dellink) 382 ops->dellink = unregister_netdevice_queue; 383 384 list_add_tail(&ops->list, &link_ops); 385 return 0; 386 } 387 EXPORT_SYMBOL_GPL(__rtnl_link_register); 388 389 /** 390 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 391 * @ops: struct rtnl_link_ops * to register 392 * 393 * Returns 0 on success or a negative error code. 394 */ 395 int rtnl_link_register(struct rtnl_link_ops *ops) 396 { 397 int err; 398 399 /* Sanity-check max sizes to avoid stack buffer overflow. */ 400 if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE || 401 ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)) 402 return -EINVAL; 403 404 rtnl_lock(); 405 err = __rtnl_link_register(ops); 406 rtnl_unlock(); 407 return err; 408 } 409 EXPORT_SYMBOL_GPL(rtnl_link_register); 410 411 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 412 { 413 struct net_device *dev; 414 LIST_HEAD(list_kill); 415 416 for_each_netdev(net, dev) { 417 if (dev->rtnl_link_ops == ops) 418 ops->dellink(dev, &list_kill); 419 } 420 unregister_netdevice_many(&list_kill); 421 } 422 423 /** 424 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 425 * @ops: struct rtnl_link_ops * to unregister 426 * 427 * The caller must hold the rtnl_mutex and guarantee net_namespace_list 428 * integrity (hold pernet_ops_rwsem for writing to close the race 429 * with setup_net() and cleanup_net()). 430 */ 431 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 432 { 433 struct net *net; 434 435 for_each_net(net) { 436 __rtnl_kill_links(net, ops); 437 } 438 list_del(&ops->list); 439 } 440 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 441 442 /* Return with the rtnl_lock held when there are no network 443 * devices unregistering in any network namespace. 444 */ 445 static void rtnl_lock_unregistering_all(void) 446 { 447 struct net *net; 448 bool unregistering; 449 DEFINE_WAIT_FUNC(wait, woken_wake_function); 450 451 add_wait_queue(&netdev_unregistering_wq, &wait); 452 for (;;) { 453 unregistering = false; 454 rtnl_lock(); 455 /* We held write locked pernet_ops_rwsem, and parallel 456 * setup_net() and cleanup_net() are not possible. 457 */ 458 for_each_net(net) { 459 if (net->dev_unreg_count > 0) { 460 unregistering = true; 461 break; 462 } 463 } 464 if (!unregistering) 465 break; 466 __rtnl_unlock(); 467 468 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 469 } 470 remove_wait_queue(&netdev_unregistering_wq, &wait); 471 } 472 473 /** 474 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 475 * @ops: struct rtnl_link_ops * to unregister 476 */ 477 void rtnl_link_unregister(struct rtnl_link_ops *ops) 478 { 479 /* Close the race with setup_net() and cleanup_net() */ 480 down_write(&pernet_ops_rwsem); 481 rtnl_lock_unregistering_all(); 482 __rtnl_link_unregister(ops); 483 rtnl_unlock(); 484 up_write(&pernet_ops_rwsem); 485 } 486 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 487 488 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 489 { 490 struct net_device *master_dev; 491 const struct rtnl_link_ops *ops; 492 size_t size = 0; 493 494 rcu_read_lock(); 495 496 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev); 497 if (!master_dev) 498 goto out; 499 500 ops = master_dev->rtnl_link_ops; 501 if (!ops || !ops->get_slave_size) 502 goto out; 503 /* IFLA_INFO_SLAVE_DATA + nested data */ 504 size = nla_total_size(sizeof(struct nlattr)) + 505 ops->get_slave_size(master_dev, dev); 506 507 out: 508 rcu_read_unlock(); 509 return size; 510 } 511 512 static size_t rtnl_link_get_size(const struct net_device *dev) 513 { 514 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 515 size_t size; 516 517 if (!ops) 518 return 0; 519 520 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 521 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 522 523 if (ops->get_size) 524 /* IFLA_INFO_DATA + nested data */ 525 size += nla_total_size(sizeof(struct nlattr)) + 526 ops->get_size(dev); 527 528 if (ops->get_xstats_size) 529 /* IFLA_INFO_XSTATS */ 530 size += nla_total_size(ops->get_xstats_size(dev)); 531 532 size += rtnl_link_get_slave_info_data_size(dev); 533 534 return size; 535 } 536 537 static LIST_HEAD(rtnl_af_ops); 538 539 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 540 { 541 const struct rtnl_af_ops *ops; 542 543 list_for_each_entry_rcu(ops, &rtnl_af_ops, list) { 544 if (ops->family == family) 545 return ops; 546 } 547 548 return NULL; 549 } 550 551 /** 552 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 553 * @ops: struct rtnl_af_ops * to register 554 * 555 * Returns 0 on success or a negative error code. 556 */ 557 void rtnl_af_register(struct rtnl_af_ops *ops) 558 { 559 rtnl_lock(); 560 list_add_tail_rcu(&ops->list, &rtnl_af_ops); 561 rtnl_unlock(); 562 } 563 EXPORT_SYMBOL_GPL(rtnl_af_register); 564 565 /** 566 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 567 * @ops: struct rtnl_af_ops * to unregister 568 */ 569 void rtnl_af_unregister(struct rtnl_af_ops *ops) 570 { 571 rtnl_lock(); 572 list_del_rcu(&ops->list); 573 rtnl_unlock(); 574 575 synchronize_rcu(); 576 } 577 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 578 579 static size_t rtnl_link_get_af_size(const struct net_device *dev, 580 u32 ext_filter_mask) 581 { 582 struct rtnl_af_ops *af_ops; 583 size_t size; 584 585 /* IFLA_AF_SPEC */ 586 size = nla_total_size(sizeof(struct nlattr)); 587 588 rcu_read_lock(); 589 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 590 if (af_ops->get_link_af_size) { 591 /* AF_* + nested data */ 592 size += nla_total_size(sizeof(struct nlattr)) + 593 af_ops->get_link_af_size(dev, ext_filter_mask); 594 } 595 } 596 rcu_read_unlock(); 597 598 return size; 599 } 600 601 static bool rtnl_have_link_slave_info(const struct net_device *dev) 602 { 603 struct net_device *master_dev; 604 bool ret = false; 605 606 rcu_read_lock(); 607 608 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev); 609 if (master_dev && master_dev->rtnl_link_ops) 610 ret = true; 611 rcu_read_unlock(); 612 return ret; 613 } 614 615 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 616 const struct net_device *dev) 617 { 618 struct net_device *master_dev; 619 const struct rtnl_link_ops *ops; 620 struct nlattr *slave_data; 621 int err; 622 623 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 624 if (!master_dev) 625 return 0; 626 ops = master_dev->rtnl_link_ops; 627 if (!ops) 628 return 0; 629 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 630 return -EMSGSIZE; 631 if (ops->fill_slave_info) { 632 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA); 633 if (!slave_data) 634 return -EMSGSIZE; 635 err = ops->fill_slave_info(skb, master_dev, dev); 636 if (err < 0) 637 goto err_cancel_slave_data; 638 nla_nest_end(skb, slave_data); 639 } 640 return 0; 641 642 err_cancel_slave_data: 643 nla_nest_cancel(skb, slave_data); 644 return err; 645 } 646 647 static int rtnl_link_info_fill(struct sk_buff *skb, 648 const struct net_device *dev) 649 { 650 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 651 struct nlattr *data; 652 int err; 653 654 if (!ops) 655 return 0; 656 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 657 return -EMSGSIZE; 658 if (ops->fill_xstats) { 659 err = ops->fill_xstats(skb, dev); 660 if (err < 0) 661 return err; 662 } 663 if (ops->fill_info) { 664 data = nla_nest_start(skb, IFLA_INFO_DATA); 665 if (data == NULL) 666 return -EMSGSIZE; 667 err = ops->fill_info(skb, dev); 668 if (err < 0) 669 goto err_cancel_data; 670 nla_nest_end(skb, data); 671 } 672 return 0; 673 674 err_cancel_data: 675 nla_nest_cancel(skb, data); 676 return err; 677 } 678 679 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 680 { 681 struct nlattr *linkinfo; 682 int err = -EMSGSIZE; 683 684 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 685 if (linkinfo == NULL) 686 goto out; 687 688 err = rtnl_link_info_fill(skb, dev); 689 if (err < 0) 690 goto err_cancel_link; 691 692 err = rtnl_link_slave_info_fill(skb, dev); 693 if (err < 0) 694 goto err_cancel_link; 695 696 nla_nest_end(skb, linkinfo); 697 return 0; 698 699 err_cancel_link: 700 nla_nest_cancel(skb, linkinfo); 701 out: 702 return err; 703 } 704 705 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 706 { 707 struct sock *rtnl = net->rtnl; 708 int err = 0; 709 710 NETLINK_CB(skb).dst_group = group; 711 if (echo) 712 refcount_inc(&skb->users); 713 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 714 if (echo) 715 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 716 return err; 717 } 718 719 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 720 { 721 struct sock *rtnl = net->rtnl; 722 723 return nlmsg_unicast(rtnl, skb, pid); 724 } 725 EXPORT_SYMBOL(rtnl_unicast); 726 727 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 728 struct nlmsghdr *nlh, gfp_t flags) 729 { 730 struct sock *rtnl = net->rtnl; 731 int report = 0; 732 733 if (nlh) 734 report = nlmsg_report(nlh); 735 736 nlmsg_notify(rtnl, skb, pid, group, report, flags); 737 } 738 EXPORT_SYMBOL(rtnl_notify); 739 740 void rtnl_set_sk_err(struct net *net, u32 group, int error) 741 { 742 struct sock *rtnl = net->rtnl; 743 744 netlink_set_err(rtnl, 0, group, error); 745 } 746 EXPORT_SYMBOL(rtnl_set_sk_err); 747 748 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 749 { 750 struct nlattr *mx; 751 int i, valid = 0; 752 753 mx = nla_nest_start(skb, RTA_METRICS); 754 if (mx == NULL) 755 return -ENOBUFS; 756 757 for (i = 0; i < RTAX_MAX; i++) { 758 if (metrics[i]) { 759 if (i == RTAX_CC_ALGO - 1) { 760 char tmp[TCP_CA_NAME_MAX], *name; 761 762 name = tcp_ca_get_name_by_key(metrics[i], tmp); 763 if (!name) 764 continue; 765 if (nla_put_string(skb, i + 1, name)) 766 goto nla_put_failure; 767 } else if (i == RTAX_FEATURES - 1) { 768 u32 user_features = metrics[i] & RTAX_FEATURE_MASK; 769 770 if (!user_features) 771 continue; 772 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); 773 if (nla_put_u32(skb, i + 1, user_features)) 774 goto nla_put_failure; 775 } else { 776 if (nla_put_u32(skb, i + 1, metrics[i])) 777 goto nla_put_failure; 778 } 779 valid++; 780 } 781 } 782 783 if (!valid) { 784 nla_nest_cancel(skb, mx); 785 return 0; 786 } 787 788 return nla_nest_end(skb, mx); 789 790 nla_put_failure: 791 nla_nest_cancel(skb, mx); 792 return -EMSGSIZE; 793 } 794 EXPORT_SYMBOL(rtnetlink_put_metrics); 795 796 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 797 long expires, u32 error) 798 { 799 struct rta_cacheinfo ci = { 800 .rta_error = error, 801 .rta_id = id, 802 }; 803 804 if (dst) { 805 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse); 806 ci.rta_used = dst->__use; 807 ci.rta_clntref = atomic_read(&dst->__refcnt); 808 } 809 if (expires) { 810 unsigned long clock; 811 812 clock = jiffies_to_clock_t(abs(expires)); 813 clock = min_t(unsigned long, clock, INT_MAX); 814 ci.rta_expires = (expires > 0) ? clock : -clock; 815 } 816 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 817 } 818 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 819 820 static void set_operstate(struct net_device *dev, unsigned char transition) 821 { 822 unsigned char operstate = dev->operstate; 823 824 switch (transition) { 825 case IF_OPER_UP: 826 if ((operstate == IF_OPER_DORMANT || 827 operstate == IF_OPER_UNKNOWN) && 828 !netif_dormant(dev)) 829 operstate = IF_OPER_UP; 830 break; 831 832 case IF_OPER_DORMANT: 833 if (operstate == IF_OPER_UP || 834 operstate == IF_OPER_UNKNOWN) 835 operstate = IF_OPER_DORMANT; 836 break; 837 } 838 839 if (dev->operstate != operstate) { 840 write_lock_bh(&dev_base_lock); 841 dev->operstate = operstate; 842 write_unlock_bh(&dev_base_lock); 843 netdev_state_change(dev); 844 } 845 } 846 847 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 848 { 849 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 850 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 851 } 852 853 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 854 const struct ifinfomsg *ifm) 855 { 856 unsigned int flags = ifm->ifi_flags; 857 858 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 859 if (ifm->ifi_change) 860 flags = (flags & ifm->ifi_change) | 861 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 862 863 return flags; 864 } 865 866 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 867 const struct rtnl_link_stats64 *b) 868 { 869 a->rx_packets = b->rx_packets; 870 a->tx_packets = b->tx_packets; 871 a->rx_bytes = b->rx_bytes; 872 a->tx_bytes = b->tx_bytes; 873 a->rx_errors = b->rx_errors; 874 a->tx_errors = b->tx_errors; 875 a->rx_dropped = b->rx_dropped; 876 a->tx_dropped = b->tx_dropped; 877 878 a->multicast = b->multicast; 879 a->collisions = b->collisions; 880 881 a->rx_length_errors = b->rx_length_errors; 882 a->rx_over_errors = b->rx_over_errors; 883 a->rx_crc_errors = b->rx_crc_errors; 884 a->rx_frame_errors = b->rx_frame_errors; 885 a->rx_fifo_errors = b->rx_fifo_errors; 886 a->rx_missed_errors = b->rx_missed_errors; 887 888 a->tx_aborted_errors = b->tx_aborted_errors; 889 a->tx_carrier_errors = b->tx_carrier_errors; 890 a->tx_fifo_errors = b->tx_fifo_errors; 891 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 892 a->tx_window_errors = b->tx_window_errors; 893 894 a->rx_compressed = b->rx_compressed; 895 a->tx_compressed = b->tx_compressed; 896 897 a->rx_nohandler = b->rx_nohandler; 898 } 899 900 /* All VF info */ 901 static inline int rtnl_vfinfo_size(const struct net_device *dev, 902 u32 ext_filter_mask) 903 { 904 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) { 905 int num_vfs = dev_num_vf(dev->dev.parent); 906 size_t size = nla_total_size(0); 907 size += num_vfs * 908 (nla_total_size(0) + 909 nla_total_size(sizeof(struct ifla_vf_mac)) + 910 nla_total_size(sizeof(struct ifla_vf_vlan)) + 911 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */ 912 nla_total_size(MAX_VLAN_LIST_LEN * 913 sizeof(struct ifla_vf_vlan_info)) + 914 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 915 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 916 nla_total_size(sizeof(struct ifla_vf_rate)) + 917 nla_total_size(sizeof(struct ifla_vf_link_state)) + 918 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 919 nla_total_size(0) + /* nest IFLA_VF_STATS */ 920 /* IFLA_VF_STATS_RX_PACKETS */ 921 nla_total_size_64bit(sizeof(__u64)) + 922 /* IFLA_VF_STATS_TX_PACKETS */ 923 nla_total_size_64bit(sizeof(__u64)) + 924 /* IFLA_VF_STATS_RX_BYTES */ 925 nla_total_size_64bit(sizeof(__u64)) + 926 /* IFLA_VF_STATS_TX_BYTES */ 927 nla_total_size_64bit(sizeof(__u64)) + 928 /* IFLA_VF_STATS_BROADCAST */ 929 nla_total_size_64bit(sizeof(__u64)) + 930 /* IFLA_VF_STATS_MULTICAST */ 931 nla_total_size_64bit(sizeof(__u64)) + 932 /* IFLA_VF_STATS_RX_DROPPED */ 933 nla_total_size_64bit(sizeof(__u64)) + 934 /* IFLA_VF_STATS_TX_DROPPED */ 935 nla_total_size_64bit(sizeof(__u64)) + 936 nla_total_size(sizeof(struct ifla_vf_trust))); 937 return size; 938 } else 939 return 0; 940 } 941 942 static size_t rtnl_port_size(const struct net_device *dev, 943 u32 ext_filter_mask) 944 { 945 size_t port_size = nla_total_size(4) /* PORT_VF */ 946 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 947 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 948 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 949 + nla_total_size(1) /* PROT_VDP_REQUEST */ 950 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 951 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 952 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 953 + port_size; 954 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 955 + port_size; 956 957 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 958 !(ext_filter_mask & RTEXT_FILTER_VF)) 959 return 0; 960 if (dev_num_vf(dev->dev.parent)) 961 return port_self_size + vf_ports_size + 962 vf_port_size * dev_num_vf(dev->dev.parent); 963 else 964 return port_self_size; 965 } 966 967 static size_t rtnl_xdp_size(void) 968 { 969 size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */ 970 nla_total_size(1) + /* XDP_ATTACHED */ 971 nla_total_size(4) + /* XDP_PROG_ID (or 1st mode) */ 972 nla_total_size(4); /* XDP_<mode>_PROG_ID */ 973 974 return xdp_size; 975 } 976 977 static noinline size_t if_nlmsg_size(const struct net_device *dev, 978 u32 ext_filter_mask) 979 { 980 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 981 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 982 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 983 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 984 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap)) 985 + nla_total_size(sizeof(struct rtnl_link_stats)) 986 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64)) 987 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 988 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 989 + nla_total_size(4) /* IFLA_TXQLEN */ 990 + nla_total_size(4) /* IFLA_WEIGHT */ 991 + nla_total_size(4) /* IFLA_MTU */ 992 + nla_total_size(4) /* IFLA_LINK */ 993 + nla_total_size(4) /* IFLA_MASTER */ 994 + nla_total_size(1) /* IFLA_CARRIER */ 995 + nla_total_size(4) /* IFLA_PROMISCUITY */ 996 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 997 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 998 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */ 999 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */ 1000 + nla_total_size(1) /* IFLA_OPERSTATE */ 1001 + nla_total_size(1) /* IFLA_LINKMODE */ 1002 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 1003 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 1004 + nla_total_size(4) /* IFLA_GROUP */ 1005 + nla_total_size(ext_filter_mask 1006 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 1007 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 1008 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 1009 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 1010 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 1011 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 1012 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 1013 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */ 1014 + rtnl_xdp_size() /* IFLA_XDP */ 1015 + nla_total_size(4) /* IFLA_EVENT */ 1016 + nla_total_size(4) /* IFLA_NEW_NETNSID */ 1017 + nla_total_size(4) /* IFLA_NEW_IFINDEX */ 1018 + nla_total_size(1) /* IFLA_PROTO_DOWN */ 1019 + nla_total_size(4) /* IFLA_TARGET_NETNSID */ 1020 + nla_total_size(4) /* IFLA_CARRIER_UP_COUNT */ 1021 + nla_total_size(4) /* IFLA_CARRIER_DOWN_COUNT */ 1022 + nla_total_size(4) /* IFLA_MIN_MTU */ 1023 + nla_total_size(4) /* IFLA_MAX_MTU */ 1024 + 0; 1025 } 1026 1027 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 1028 { 1029 struct nlattr *vf_ports; 1030 struct nlattr *vf_port; 1031 int vf; 1032 int err; 1033 1034 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 1035 if (!vf_ports) 1036 return -EMSGSIZE; 1037 1038 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 1039 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 1040 if (!vf_port) 1041 goto nla_put_failure; 1042 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 1043 goto nla_put_failure; 1044 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 1045 if (err == -EMSGSIZE) 1046 goto nla_put_failure; 1047 if (err) { 1048 nla_nest_cancel(skb, vf_port); 1049 continue; 1050 } 1051 nla_nest_end(skb, vf_port); 1052 } 1053 1054 nla_nest_end(skb, vf_ports); 1055 1056 return 0; 1057 1058 nla_put_failure: 1059 nla_nest_cancel(skb, vf_ports); 1060 return -EMSGSIZE; 1061 } 1062 1063 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 1064 { 1065 struct nlattr *port_self; 1066 int err; 1067 1068 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 1069 if (!port_self) 1070 return -EMSGSIZE; 1071 1072 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 1073 if (err) { 1074 nla_nest_cancel(skb, port_self); 1075 return (err == -EMSGSIZE) ? err : 0; 1076 } 1077 1078 nla_nest_end(skb, port_self); 1079 1080 return 0; 1081 } 1082 1083 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 1084 u32 ext_filter_mask) 1085 { 1086 int err; 1087 1088 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 1089 !(ext_filter_mask & RTEXT_FILTER_VF)) 1090 return 0; 1091 1092 err = rtnl_port_self_fill(skb, dev); 1093 if (err) 1094 return err; 1095 1096 if (dev_num_vf(dev->dev.parent)) { 1097 err = rtnl_vf_ports_fill(skb, dev); 1098 if (err) 1099 return err; 1100 } 1101 1102 return 0; 1103 } 1104 1105 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 1106 { 1107 int err; 1108 struct netdev_phys_item_id ppid; 1109 1110 err = dev_get_phys_port_id(dev, &ppid); 1111 if (err) { 1112 if (err == -EOPNOTSUPP) 1113 return 0; 1114 return err; 1115 } 1116 1117 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1118 return -EMSGSIZE; 1119 1120 return 0; 1121 } 1122 1123 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1124 { 1125 char name[IFNAMSIZ]; 1126 int err; 1127 1128 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1129 if (err) { 1130 if (err == -EOPNOTSUPP) 1131 return 0; 1132 return err; 1133 } 1134 1135 if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name)) 1136 return -EMSGSIZE; 1137 1138 return 0; 1139 } 1140 1141 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1142 { 1143 int err; 1144 struct switchdev_attr attr = { 1145 .orig_dev = dev, 1146 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 1147 .flags = SWITCHDEV_F_NO_RECURSE, 1148 }; 1149 1150 err = switchdev_port_attr_get(dev, &attr); 1151 if (err) { 1152 if (err == -EOPNOTSUPP) 1153 return 0; 1154 return err; 1155 } 1156 1157 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1158 attr.u.ppid.id)) 1159 return -EMSGSIZE; 1160 1161 return 0; 1162 } 1163 1164 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1165 struct net_device *dev) 1166 { 1167 struct rtnl_link_stats64 *sp; 1168 struct nlattr *attr; 1169 1170 attr = nla_reserve_64bit(skb, IFLA_STATS64, 1171 sizeof(struct rtnl_link_stats64), IFLA_PAD); 1172 if (!attr) 1173 return -EMSGSIZE; 1174 1175 sp = nla_data(attr); 1176 dev_get_stats(dev, sp); 1177 1178 attr = nla_reserve(skb, IFLA_STATS, 1179 sizeof(struct rtnl_link_stats)); 1180 if (!attr) 1181 return -EMSGSIZE; 1182 1183 copy_rtnl_link_stats(nla_data(attr), sp); 1184 1185 return 0; 1186 } 1187 1188 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1189 struct net_device *dev, 1190 int vfs_num, 1191 struct nlattr *vfinfo) 1192 { 1193 struct ifla_vf_rss_query_en vf_rss_query_en; 1194 struct nlattr *vf, *vfstats, *vfvlanlist; 1195 struct ifla_vf_link_state vf_linkstate; 1196 struct ifla_vf_vlan_info vf_vlan_info; 1197 struct ifla_vf_spoofchk vf_spoofchk; 1198 struct ifla_vf_tx_rate vf_tx_rate; 1199 struct ifla_vf_stats vf_stats; 1200 struct ifla_vf_trust vf_trust; 1201 struct ifla_vf_vlan vf_vlan; 1202 struct ifla_vf_rate vf_rate; 1203 struct ifla_vf_mac vf_mac; 1204 struct ifla_vf_info ivi; 1205 1206 memset(&ivi, 0, sizeof(ivi)); 1207 1208 /* Not all SR-IOV capable drivers support the 1209 * spoofcheck and "RSS query enable" query. Preset to 1210 * -1 so the user space tool can detect that the driver 1211 * didn't report anything. 1212 */ 1213 ivi.spoofchk = -1; 1214 ivi.rss_query_en = -1; 1215 ivi.trusted = -1; 1216 /* The default value for VF link state is "auto" 1217 * IFLA_VF_LINK_STATE_AUTO which equals zero 1218 */ 1219 ivi.linkstate = 0; 1220 /* VLAN Protocol by default is 802.1Q */ 1221 ivi.vlan_proto = htons(ETH_P_8021Q); 1222 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1223 return 0; 1224 1225 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info)); 1226 1227 vf_mac.vf = 1228 vf_vlan.vf = 1229 vf_vlan_info.vf = 1230 vf_rate.vf = 1231 vf_tx_rate.vf = 1232 vf_spoofchk.vf = 1233 vf_linkstate.vf = 1234 vf_rss_query_en.vf = 1235 vf_trust.vf = ivi.vf; 1236 1237 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1238 vf_vlan.vlan = ivi.vlan; 1239 vf_vlan.qos = ivi.qos; 1240 vf_vlan_info.vlan = ivi.vlan; 1241 vf_vlan_info.qos = ivi.qos; 1242 vf_vlan_info.vlan_proto = ivi.vlan_proto; 1243 vf_tx_rate.rate = ivi.max_tx_rate; 1244 vf_rate.min_tx_rate = ivi.min_tx_rate; 1245 vf_rate.max_tx_rate = ivi.max_tx_rate; 1246 vf_spoofchk.setting = ivi.spoofchk; 1247 vf_linkstate.link_state = ivi.linkstate; 1248 vf_rss_query_en.setting = ivi.rss_query_en; 1249 vf_trust.setting = ivi.trusted; 1250 vf = nla_nest_start(skb, IFLA_VF_INFO); 1251 if (!vf) 1252 goto nla_put_vfinfo_failure; 1253 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1254 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1255 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1256 &vf_rate) || 1257 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1258 &vf_tx_rate) || 1259 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1260 &vf_spoofchk) || 1261 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1262 &vf_linkstate) || 1263 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1264 sizeof(vf_rss_query_en), 1265 &vf_rss_query_en) || 1266 nla_put(skb, IFLA_VF_TRUST, 1267 sizeof(vf_trust), &vf_trust)) 1268 goto nla_put_vf_failure; 1269 vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST); 1270 if (!vfvlanlist) 1271 goto nla_put_vf_failure; 1272 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info), 1273 &vf_vlan_info)) { 1274 nla_nest_cancel(skb, vfvlanlist); 1275 goto nla_put_vf_failure; 1276 } 1277 nla_nest_end(skb, vfvlanlist); 1278 memset(&vf_stats, 0, sizeof(vf_stats)); 1279 if (dev->netdev_ops->ndo_get_vf_stats) 1280 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1281 &vf_stats); 1282 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1283 if (!vfstats) 1284 goto nla_put_vf_failure; 1285 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS, 1286 vf_stats.rx_packets, IFLA_VF_STATS_PAD) || 1287 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS, 1288 vf_stats.tx_packets, IFLA_VF_STATS_PAD) || 1289 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES, 1290 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) || 1291 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES, 1292 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) || 1293 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST, 1294 vf_stats.broadcast, IFLA_VF_STATS_PAD) || 1295 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST, 1296 vf_stats.multicast, IFLA_VF_STATS_PAD) || 1297 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED, 1298 vf_stats.rx_dropped, IFLA_VF_STATS_PAD) || 1299 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED, 1300 vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) { 1301 nla_nest_cancel(skb, vfstats); 1302 goto nla_put_vf_failure; 1303 } 1304 nla_nest_end(skb, vfstats); 1305 nla_nest_end(skb, vf); 1306 return 0; 1307 1308 nla_put_vf_failure: 1309 nla_nest_cancel(skb, vf); 1310 nla_put_vfinfo_failure: 1311 nla_nest_cancel(skb, vfinfo); 1312 return -EMSGSIZE; 1313 } 1314 1315 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb, 1316 struct net_device *dev, 1317 u32 ext_filter_mask) 1318 { 1319 struct nlattr *vfinfo; 1320 int i, num_vfs; 1321 1322 if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0)) 1323 return 0; 1324 1325 num_vfs = dev_num_vf(dev->dev.parent); 1326 if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs)) 1327 return -EMSGSIZE; 1328 1329 if (!dev->netdev_ops->ndo_get_vf_config) 1330 return 0; 1331 1332 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1333 if (!vfinfo) 1334 return -EMSGSIZE; 1335 1336 for (i = 0; i < num_vfs; i++) { 1337 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1338 return -EMSGSIZE; 1339 } 1340 1341 nla_nest_end(skb, vfinfo); 1342 return 0; 1343 } 1344 1345 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1346 { 1347 struct rtnl_link_ifmap map; 1348 1349 memset(&map, 0, sizeof(map)); 1350 map.mem_start = dev->mem_start; 1351 map.mem_end = dev->mem_end; 1352 map.base_addr = dev->base_addr; 1353 map.irq = dev->irq; 1354 map.dma = dev->dma; 1355 map.port = dev->if_port; 1356 1357 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD)) 1358 return -EMSGSIZE; 1359 1360 return 0; 1361 } 1362 1363 static u32 rtnl_xdp_prog_skb(struct net_device *dev) 1364 { 1365 const struct bpf_prog *generic_xdp_prog; 1366 1367 ASSERT_RTNL(); 1368 1369 generic_xdp_prog = rtnl_dereference(dev->xdp_prog); 1370 if (!generic_xdp_prog) 1371 return 0; 1372 return generic_xdp_prog->aux->id; 1373 } 1374 1375 static u32 rtnl_xdp_prog_drv(struct net_device *dev) 1376 { 1377 return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf, XDP_QUERY_PROG); 1378 } 1379 1380 static u32 rtnl_xdp_prog_hw(struct net_device *dev) 1381 { 1382 return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf, 1383 XDP_QUERY_PROG_HW); 1384 } 1385 1386 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev, 1387 u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr, 1388 u32 (*get_prog_id)(struct net_device *dev)) 1389 { 1390 u32 curr_id; 1391 int err; 1392 1393 curr_id = get_prog_id(dev); 1394 if (!curr_id) 1395 return 0; 1396 1397 *prog_id = curr_id; 1398 err = nla_put_u32(skb, attr, curr_id); 1399 if (err) 1400 return err; 1401 1402 if (*mode != XDP_ATTACHED_NONE) 1403 *mode = XDP_ATTACHED_MULTI; 1404 else 1405 *mode = tgt_mode; 1406 1407 return 0; 1408 } 1409 1410 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev) 1411 { 1412 struct nlattr *xdp; 1413 u32 prog_id; 1414 int err; 1415 u8 mode; 1416 1417 xdp = nla_nest_start(skb, IFLA_XDP); 1418 if (!xdp) 1419 return -EMSGSIZE; 1420 1421 prog_id = 0; 1422 mode = XDP_ATTACHED_NONE; 1423 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB, 1424 IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb); 1425 if (err) 1426 goto err_cancel; 1427 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV, 1428 IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv); 1429 if (err) 1430 goto err_cancel; 1431 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW, 1432 IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw); 1433 if (err) 1434 goto err_cancel; 1435 1436 err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode); 1437 if (err) 1438 goto err_cancel; 1439 1440 if (prog_id && mode != XDP_ATTACHED_MULTI) { 1441 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id); 1442 if (err) 1443 goto err_cancel; 1444 } 1445 1446 nla_nest_end(skb, xdp); 1447 return 0; 1448 1449 err_cancel: 1450 nla_nest_cancel(skb, xdp); 1451 return err; 1452 } 1453 1454 static u32 rtnl_get_event(unsigned long event) 1455 { 1456 u32 rtnl_event_type = IFLA_EVENT_NONE; 1457 1458 switch (event) { 1459 case NETDEV_REBOOT: 1460 rtnl_event_type = IFLA_EVENT_REBOOT; 1461 break; 1462 case NETDEV_FEAT_CHANGE: 1463 rtnl_event_type = IFLA_EVENT_FEATURES; 1464 break; 1465 case NETDEV_BONDING_FAILOVER: 1466 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER; 1467 break; 1468 case NETDEV_NOTIFY_PEERS: 1469 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS; 1470 break; 1471 case NETDEV_RESEND_IGMP: 1472 rtnl_event_type = IFLA_EVENT_IGMP_RESEND; 1473 break; 1474 case NETDEV_CHANGEINFODATA: 1475 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS; 1476 break; 1477 default: 1478 break; 1479 } 1480 1481 return rtnl_event_type; 1482 } 1483 1484 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev) 1485 { 1486 const struct net_device *upper_dev; 1487 int ret = 0; 1488 1489 rcu_read_lock(); 1490 1491 upper_dev = netdev_master_upper_dev_get_rcu(dev); 1492 if (upper_dev) 1493 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex); 1494 1495 rcu_read_unlock(); 1496 return ret; 1497 } 1498 1499 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev) 1500 { 1501 int ifindex = dev_get_iflink(dev); 1502 1503 if (dev->ifindex == ifindex) 1504 return 0; 1505 1506 return nla_put_u32(skb, IFLA_LINK, ifindex); 1507 } 1508 1509 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb, 1510 struct net_device *dev) 1511 { 1512 char buf[IFALIASZ]; 1513 int ret; 1514 1515 ret = dev_get_alias(dev, buf, sizeof(buf)); 1516 return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0; 1517 } 1518 1519 static int rtnl_fill_link_netnsid(struct sk_buff *skb, 1520 const struct net_device *dev, 1521 struct net *src_net) 1522 { 1523 if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) { 1524 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1525 1526 if (!net_eq(dev_net(dev), link_net)) { 1527 int id = peernet2id_alloc(src_net, link_net); 1528 1529 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1530 return -EMSGSIZE; 1531 } 1532 } 1533 1534 return 0; 1535 } 1536 1537 static int rtnl_fill_link_af(struct sk_buff *skb, 1538 const struct net_device *dev, 1539 u32 ext_filter_mask) 1540 { 1541 const struct rtnl_af_ops *af_ops; 1542 struct nlattr *af_spec; 1543 1544 af_spec = nla_nest_start(skb, IFLA_AF_SPEC); 1545 if (!af_spec) 1546 return -EMSGSIZE; 1547 1548 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 1549 struct nlattr *af; 1550 int err; 1551 1552 if (!af_ops->fill_link_af) 1553 continue; 1554 1555 af = nla_nest_start(skb, af_ops->family); 1556 if (!af) 1557 return -EMSGSIZE; 1558 1559 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1560 /* 1561 * Caller may return ENODATA to indicate that there 1562 * was no data to be dumped. This is not an error, it 1563 * means we should trim the attribute header and 1564 * continue. 1565 */ 1566 if (err == -ENODATA) 1567 nla_nest_cancel(skb, af); 1568 else if (err < 0) 1569 return -EMSGSIZE; 1570 1571 nla_nest_end(skb, af); 1572 } 1573 1574 nla_nest_end(skb, af_spec); 1575 return 0; 1576 } 1577 1578 static int rtnl_fill_ifinfo(struct sk_buff *skb, 1579 struct net_device *dev, struct net *src_net, 1580 int type, u32 pid, u32 seq, u32 change, 1581 unsigned int flags, u32 ext_filter_mask, 1582 u32 event, int *new_nsid, int new_ifindex, 1583 int tgt_netnsid) 1584 { 1585 struct ifinfomsg *ifm; 1586 struct nlmsghdr *nlh; 1587 1588 ASSERT_RTNL(); 1589 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1590 if (nlh == NULL) 1591 return -EMSGSIZE; 1592 1593 ifm = nlmsg_data(nlh); 1594 ifm->ifi_family = AF_UNSPEC; 1595 ifm->__ifi_pad = 0; 1596 ifm->ifi_type = dev->type; 1597 ifm->ifi_index = dev->ifindex; 1598 ifm->ifi_flags = dev_get_flags(dev); 1599 ifm->ifi_change = change; 1600 1601 if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid)) 1602 goto nla_put_failure; 1603 1604 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1605 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1606 nla_put_u8(skb, IFLA_OPERSTATE, 1607 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1608 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1609 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1610 nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) || 1611 nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) || 1612 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1613 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1614 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1615 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) || 1616 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) || 1617 #ifdef CONFIG_RPS 1618 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1619 #endif 1620 nla_put_iflink(skb, dev) || 1621 put_master_ifindex(skb, dev) || 1622 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1623 (dev->qdisc && 1624 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1625 nla_put_ifalias(skb, dev) || 1626 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1627 atomic_read(&dev->carrier_up_count) + 1628 atomic_read(&dev->carrier_down_count)) || 1629 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down) || 1630 nla_put_u32(skb, IFLA_CARRIER_UP_COUNT, 1631 atomic_read(&dev->carrier_up_count)) || 1632 nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT, 1633 atomic_read(&dev->carrier_down_count))) 1634 goto nla_put_failure; 1635 1636 if (event != IFLA_EVENT_NONE) { 1637 if (nla_put_u32(skb, IFLA_EVENT, event)) 1638 goto nla_put_failure; 1639 } 1640 1641 if (rtnl_fill_link_ifmap(skb, dev)) 1642 goto nla_put_failure; 1643 1644 if (dev->addr_len) { 1645 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1646 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1647 goto nla_put_failure; 1648 } 1649 1650 if (rtnl_phys_port_id_fill(skb, dev)) 1651 goto nla_put_failure; 1652 1653 if (rtnl_phys_port_name_fill(skb, dev)) 1654 goto nla_put_failure; 1655 1656 if (rtnl_phys_switch_id_fill(skb, dev)) 1657 goto nla_put_failure; 1658 1659 if (rtnl_fill_stats(skb, dev)) 1660 goto nla_put_failure; 1661 1662 if (rtnl_fill_vf(skb, dev, ext_filter_mask)) 1663 goto nla_put_failure; 1664 1665 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1666 goto nla_put_failure; 1667 1668 if (rtnl_xdp_fill(skb, dev)) 1669 goto nla_put_failure; 1670 1671 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1672 if (rtnl_link_fill(skb, dev) < 0) 1673 goto nla_put_failure; 1674 } 1675 1676 if (rtnl_fill_link_netnsid(skb, dev, src_net)) 1677 goto nla_put_failure; 1678 1679 if (new_nsid && 1680 nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0) 1681 goto nla_put_failure; 1682 if (new_ifindex && 1683 nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0) 1684 goto nla_put_failure; 1685 1686 1687 rcu_read_lock(); 1688 if (rtnl_fill_link_af(skb, dev, ext_filter_mask)) 1689 goto nla_put_failure_rcu; 1690 rcu_read_unlock(); 1691 1692 nlmsg_end(skb, nlh); 1693 return 0; 1694 1695 nla_put_failure_rcu: 1696 rcu_read_unlock(); 1697 nla_put_failure: 1698 nlmsg_cancel(skb, nlh); 1699 return -EMSGSIZE; 1700 } 1701 1702 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1703 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1704 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1705 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1706 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1707 [IFLA_MTU] = { .type = NLA_U32 }, 1708 [IFLA_LINK] = { .type = NLA_U32 }, 1709 [IFLA_MASTER] = { .type = NLA_U32 }, 1710 [IFLA_CARRIER] = { .type = NLA_U8 }, 1711 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1712 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1713 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1714 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1715 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1716 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1717 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1718 /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to 1719 * allow 0-length string (needed to remove an alias). 1720 */ 1721 [IFLA_IFALIAS] = { .type = NLA_BINARY, .len = IFALIASZ - 1 }, 1722 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1723 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1724 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1725 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1726 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1727 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1728 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1729 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1730 [IFLA_GSO_MAX_SEGS] = { .type = NLA_U32 }, 1731 [IFLA_GSO_MAX_SIZE] = { .type = NLA_U32 }, 1732 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1733 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1734 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1735 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1736 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1737 [IFLA_XDP] = { .type = NLA_NESTED }, 1738 [IFLA_EVENT] = { .type = NLA_U32 }, 1739 [IFLA_GROUP] = { .type = NLA_U32 }, 1740 [IFLA_TARGET_NETNSID] = { .type = NLA_S32 }, 1741 [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 }, 1742 [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 }, 1743 [IFLA_MIN_MTU] = { .type = NLA_U32 }, 1744 [IFLA_MAX_MTU] = { .type = NLA_U32 }, 1745 }; 1746 1747 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1748 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1749 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1750 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1751 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1752 }; 1753 1754 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1755 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1756 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1757 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED }, 1758 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1759 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1760 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1761 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1762 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1763 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1764 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1765 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1766 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1767 }; 1768 1769 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1770 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1771 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1772 .len = PORT_PROFILE_MAX }, 1773 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1774 .len = PORT_UUID_MAX }, 1775 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1776 .len = PORT_UUID_MAX }, 1777 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1778 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1779 1780 /* Unused, but we need to keep it here since user space could 1781 * fill it. It's also broken with regard to NLA_BINARY use in 1782 * combination with structs. 1783 */ 1784 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1785 .len = sizeof(struct ifla_port_vsi) }, 1786 }; 1787 1788 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = { 1789 [IFLA_XDP_FD] = { .type = NLA_S32 }, 1790 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 }, 1791 [IFLA_XDP_FLAGS] = { .type = NLA_U32 }, 1792 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 }, 1793 }; 1794 1795 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 1796 { 1797 const struct rtnl_link_ops *ops = NULL; 1798 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 1799 1800 if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, 1801 ifla_info_policy, NULL) < 0) 1802 return NULL; 1803 1804 if (linfo[IFLA_INFO_KIND]) { 1805 char kind[MODULE_NAME_LEN]; 1806 1807 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 1808 ops = rtnl_link_ops_get(kind); 1809 } 1810 1811 return ops; 1812 } 1813 1814 static bool link_master_filtered(struct net_device *dev, int master_idx) 1815 { 1816 struct net_device *master; 1817 1818 if (!master_idx) 1819 return false; 1820 1821 master = netdev_master_upper_dev_get(dev); 1822 if (!master || master->ifindex != master_idx) 1823 return true; 1824 1825 return false; 1826 } 1827 1828 static bool link_kind_filtered(const struct net_device *dev, 1829 const struct rtnl_link_ops *kind_ops) 1830 { 1831 if (kind_ops && dev->rtnl_link_ops != kind_ops) 1832 return true; 1833 1834 return false; 1835 } 1836 1837 static bool link_dump_filtered(struct net_device *dev, 1838 int master_idx, 1839 const struct rtnl_link_ops *kind_ops) 1840 { 1841 if (link_master_filtered(dev, master_idx) || 1842 link_kind_filtered(dev, kind_ops)) 1843 return true; 1844 1845 return false; 1846 } 1847 1848 /** 1849 * rtnl_get_net_ns_capable - Get netns if sufficiently privileged. 1850 * @sk: netlink socket 1851 * @netnsid: network namespace identifier 1852 * 1853 * Returns the network namespace identified by netnsid on success or an error 1854 * pointer on failure. 1855 */ 1856 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid) 1857 { 1858 struct net *net; 1859 1860 net = get_net_ns_by_id(sock_net(sk), netnsid); 1861 if (!net) 1862 return ERR_PTR(-EINVAL); 1863 1864 /* For now, the caller is required to have CAP_NET_ADMIN in 1865 * the user namespace owning the target net ns. 1866 */ 1867 if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) { 1868 put_net(net); 1869 return ERR_PTR(-EACCES); 1870 } 1871 return net; 1872 } 1873 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable); 1874 1875 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1876 { 1877 struct net *net = sock_net(skb->sk); 1878 struct net *tgt_net = net; 1879 int h, s_h; 1880 int idx = 0, s_idx; 1881 struct net_device *dev; 1882 struct hlist_head *head; 1883 struct nlattr *tb[IFLA_MAX+1]; 1884 u32 ext_filter_mask = 0; 1885 const struct rtnl_link_ops *kind_ops = NULL; 1886 unsigned int flags = NLM_F_MULTI; 1887 int master_idx = 0; 1888 int netnsid = -1; 1889 int err; 1890 int hdrlen; 1891 1892 s_h = cb->args[0]; 1893 s_idx = cb->args[1]; 1894 1895 /* A hack to preserve kernel<->userspace interface. 1896 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1897 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1898 * what iproute2 < v3.9.0 used. 1899 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1900 * attribute, its netlink message is shorter than struct ifinfomsg. 1901 */ 1902 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1903 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1904 1905 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, 1906 ifla_policy, NULL) >= 0) { 1907 if (tb[IFLA_TARGET_NETNSID]) { 1908 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 1909 tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid); 1910 if (IS_ERR(tgt_net)) { 1911 tgt_net = net; 1912 netnsid = -1; 1913 } 1914 } 1915 1916 if (tb[IFLA_EXT_MASK]) 1917 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1918 1919 if (tb[IFLA_MASTER]) 1920 master_idx = nla_get_u32(tb[IFLA_MASTER]); 1921 1922 if (tb[IFLA_LINKINFO]) 1923 kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]); 1924 1925 if (master_idx || kind_ops) 1926 flags |= NLM_F_DUMP_FILTERED; 1927 } 1928 1929 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1930 idx = 0; 1931 head = &tgt_net->dev_index_head[h]; 1932 hlist_for_each_entry(dev, head, index_hlist) { 1933 if (link_dump_filtered(dev, master_idx, kind_ops)) 1934 goto cont; 1935 if (idx < s_idx) 1936 goto cont; 1937 err = rtnl_fill_ifinfo(skb, dev, net, 1938 RTM_NEWLINK, 1939 NETLINK_CB(cb->skb).portid, 1940 cb->nlh->nlmsg_seq, 0, 1941 flags, 1942 ext_filter_mask, 0, NULL, 0, 1943 netnsid); 1944 1945 if (err < 0) { 1946 if (likely(skb->len)) 1947 goto out; 1948 1949 goto out_err; 1950 } 1951 cont: 1952 idx++; 1953 } 1954 } 1955 out: 1956 err = skb->len; 1957 out_err: 1958 cb->args[1] = idx; 1959 cb->args[0] = h; 1960 cb->seq = net->dev_base_seq; 1961 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1962 if (netnsid >= 0) 1963 put_net(tgt_net); 1964 1965 return err; 1966 } 1967 1968 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len, 1969 struct netlink_ext_ack *exterr) 1970 { 1971 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy, exterr); 1972 } 1973 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1974 1975 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1976 { 1977 struct net *net; 1978 /* Examine the link attributes and figure out which 1979 * network namespace we are talking about. 1980 */ 1981 if (tb[IFLA_NET_NS_PID]) 1982 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1983 else if (tb[IFLA_NET_NS_FD]) 1984 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1985 else 1986 net = get_net(src_net); 1987 return net; 1988 } 1989 EXPORT_SYMBOL(rtnl_link_get_net); 1990 1991 /* Figure out which network namespace we are talking about by 1992 * examining the link attributes in the following order: 1993 * 1994 * 1. IFLA_NET_NS_PID 1995 * 2. IFLA_NET_NS_FD 1996 * 3. IFLA_TARGET_NETNSID 1997 */ 1998 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net, 1999 struct nlattr *tb[]) 2000 { 2001 struct net *net; 2002 2003 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) 2004 return rtnl_link_get_net(src_net, tb); 2005 2006 if (!tb[IFLA_TARGET_NETNSID]) 2007 return get_net(src_net); 2008 2009 net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID])); 2010 if (!net) 2011 return ERR_PTR(-EINVAL); 2012 2013 return net; 2014 } 2015 2016 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb, 2017 struct net *src_net, 2018 struct nlattr *tb[], int cap) 2019 { 2020 struct net *net; 2021 2022 net = rtnl_link_get_net_by_nlattr(src_net, tb); 2023 if (IS_ERR(net)) 2024 return net; 2025 2026 if (!netlink_ns_capable(skb, net->user_ns, cap)) { 2027 put_net(net); 2028 return ERR_PTR(-EPERM); 2029 } 2030 2031 return net; 2032 } 2033 2034 /* Verify that rtnetlink requests do not pass additional properties 2035 * potentially referring to different network namespaces. 2036 */ 2037 static int rtnl_ensure_unique_netns(struct nlattr *tb[], 2038 struct netlink_ext_ack *extack, 2039 bool netns_id_only) 2040 { 2041 2042 if (netns_id_only) { 2043 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD]) 2044 return 0; 2045 2046 NL_SET_ERR_MSG(extack, "specified netns attribute not supported"); 2047 return -EOPNOTSUPP; 2048 } 2049 2050 if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])) 2051 goto invalid_attr; 2052 2053 if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD])) 2054 goto invalid_attr; 2055 2056 if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID])) 2057 goto invalid_attr; 2058 2059 return 0; 2060 2061 invalid_attr: 2062 NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified"); 2063 return -EINVAL; 2064 } 2065 2066 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 2067 { 2068 if (dev) { 2069 if (tb[IFLA_ADDRESS] && 2070 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 2071 return -EINVAL; 2072 2073 if (tb[IFLA_BROADCAST] && 2074 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 2075 return -EINVAL; 2076 } 2077 2078 if (tb[IFLA_AF_SPEC]) { 2079 struct nlattr *af; 2080 int rem, err; 2081 2082 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2083 const struct rtnl_af_ops *af_ops; 2084 2085 rcu_read_lock(); 2086 af_ops = rtnl_af_lookup(nla_type(af)); 2087 if (!af_ops) { 2088 rcu_read_unlock(); 2089 return -EAFNOSUPPORT; 2090 } 2091 2092 if (!af_ops->set_link_af) { 2093 rcu_read_unlock(); 2094 return -EOPNOTSUPP; 2095 } 2096 2097 if (af_ops->validate_link_af) { 2098 err = af_ops->validate_link_af(dev, af); 2099 if (err < 0) { 2100 rcu_read_unlock(); 2101 return err; 2102 } 2103 } 2104 2105 rcu_read_unlock(); 2106 } 2107 } 2108 2109 return 0; 2110 } 2111 2112 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt, 2113 int guid_type) 2114 { 2115 const struct net_device_ops *ops = dev->netdev_ops; 2116 2117 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type); 2118 } 2119 2120 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type) 2121 { 2122 if (dev->type != ARPHRD_INFINIBAND) 2123 return -EOPNOTSUPP; 2124 2125 return handle_infiniband_guid(dev, ivt, guid_type); 2126 } 2127 2128 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 2129 { 2130 const struct net_device_ops *ops = dev->netdev_ops; 2131 int err = -EINVAL; 2132 2133 if (tb[IFLA_VF_MAC]) { 2134 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 2135 2136 err = -EOPNOTSUPP; 2137 if (ops->ndo_set_vf_mac) 2138 err = ops->ndo_set_vf_mac(dev, ivm->vf, 2139 ivm->mac); 2140 if (err < 0) 2141 return err; 2142 } 2143 2144 if (tb[IFLA_VF_VLAN]) { 2145 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 2146 2147 err = -EOPNOTSUPP; 2148 if (ops->ndo_set_vf_vlan) 2149 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 2150 ivv->qos, 2151 htons(ETH_P_8021Q)); 2152 if (err < 0) 2153 return err; 2154 } 2155 2156 if (tb[IFLA_VF_VLAN_LIST]) { 2157 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN]; 2158 struct nlattr *attr; 2159 int rem, len = 0; 2160 2161 err = -EOPNOTSUPP; 2162 if (!ops->ndo_set_vf_vlan) 2163 return err; 2164 2165 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) { 2166 if (nla_type(attr) != IFLA_VF_VLAN_INFO || 2167 nla_len(attr) < NLA_HDRLEN) { 2168 return -EINVAL; 2169 } 2170 if (len >= MAX_VLAN_LIST_LEN) 2171 return -EOPNOTSUPP; 2172 ivvl[len] = nla_data(attr); 2173 2174 len++; 2175 } 2176 if (len == 0) 2177 return -EINVAL; 2178 2179 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan, 2180 ivvl[0]->qos, ivvl[0]->vlan_proto); 2181 if (err < 0) 2182 return err; 2183 } 2184 2185 if (tb[IFLA_VF_TX_RATE]) { 2186 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 2187 struct ifla_vf_info ivf; 2188 2189 err = -EOPNOTSUPP; 2190 if (ops->ndo_get_vf_config) 2191 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 2192 if (err < 0) 2193 return err; 2194 2195 err = -EOPNOTSUPP; 2196 if (ops->ndo_set_vf_rate) 2197 err = ops->ndo_set_vf_rate(dev, ivt->vf, 2198 ivf.min_tx_rate, 2199 ivt->rate); 2200 if (err < 0) 2201 return err; 2202 } 2203 2204 if (tb[IFLA_VF_RATE]) { 2205 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 2206 2207 err = -EOPNOTSUPP; 2208 if (ops->ndo_set_vf_rate) 2209 err = ops->ndo_set_vf_rate(dev, ivt->vf, 2210 ivt->min_tx_rate, 2211 ivt->max_tx_rate); 2212 if (err < 0) 2213 return err; 2214 } 2215 2216 if (tb[IFLA_VF_SPOOFCHK]) { 2217 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 2218 2219 err = -EOPNOTSUPP; 2220 if (ops->ndo_set_vf_spoofchk) 2221 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 2222 ivs->setting); 2223 if (err < 0) 2224 return err; 2225 } 2226 2227 if (tb[IFLA_VF_LINK_STATE]) { 2228 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 2229 2230 err = -EOPNOTSUPP; 2231 if (ops->ndo_set_vf_link_state) 2232 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 2233 ivl->link_state); 2234 if (err < 0) 2235 return err; 2236 } 2237 2238 if (tb[IFLA_VF_RSS_QUERY_EN]) { 2239 struct ifla_vf_rss_query_en *ivrssq_en; 2240 2241 err = -EOPNOTSUPP; 2242 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 2243 if (ops->ndo_set_vf_rss_query_en) 2244 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 2245 ivrssq_en->setting); 2246 if (err < 0) 2247 return err; 2248 } 2249 2250 if (tb[IFLA_VF_TRUST]) { 2251 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 2252 2253 err = -EOPNOTSUPP; 2254 if (ops->ndo_set_vf_trust) 2255 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 2256 if (err < 0) 2257 return err; 2258 } 2259 2260 if (tb[IFLA_VF_IB_NODE_GUID]) { 2261 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]); 2262 2263 if (!ops->ndo_set_vf_guid) 2264 return -EOPNOTSUPP; 2265 2266 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID); 2267 } 2268 2269 if (tb[IFLA_VF_IB_PORT_GUID]) { 2270 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]); 2271 2272 if (!ops->ndo_set_vf_guid) 2273 return -EOPNOTSUPP; 2274 2275 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID); 2276 } 2277 2278 return err; 2279 } 2280 2281 static int do_set_master(struct net_device *dev, int ifindex, 2282 struct netlink_ext_ack *extack) 2283 { 2284 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 2285 const struct net_device_ops *ops; 2286 int err; 2287 2288 if (upper_dev) { 2289 if (upper_dev->ifindex == ifindex) 2290 return 0; 2291 ops = upper_dev->netdev_ops; 2292 if (ops->ndo_del_slave) { 2293 err = ops->ndo_del_slave(upper_dev, dev); 2294 if (err) 2295 return err; 2296 } else { 2297 return -EOPNOTSUPP; 2298 } 2299 } 2300 2301 if (ifindex) { 2302 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 2303 if (!upper_dev) 2304 return -EINVAL; 2305 ops = upper_dev->netdev_ops; 2306 if (ops->ndo_add_slave) { 2307 err = ops->ndo_add_slave(upper_dev, dev, extack); 2308 if (err) 2309 return err; 2310 } else { 2311 return -EOPNOTSUPP; 2312 } 2313 } 2314 return 0; 2315 } 2316 2317 #define DO_SETLINK_MODIFIED 0x01 2318 /* notify flag means notify + modified. */ 2319 #define DO_SETLINK_NOTIFY 0x03 2320 static int do_setlink(const struct sk_buff *skb, 2321 struct net_device *dev, struct ifinfomsg *ifm, 2322 struct netlink_ext_ack *extack, 2323 struct nlattr **tb, char *ifname, int status) 2324 { 2325 const struct net_device_ops *ops = dev->netdev_ops; 2326 int err; 2327 2328 err = validate_linkmsg(dev, tb); 2329 if (err < 0) 2330 return err; 2331 2332 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) { 2333 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev), 2334 tb, CAP_NET_ADMIN); 2335 if (IS_ERR(net)) { 2336 err = PTR_ERR(net); 2337 goto errout; 2338 } 2339 2340 err = dev_change_net_namespace(dev, net, ifname); 2341 put_net(net); 2342 if (err) 2343 goto errout; 2344 status |= DO_SETLINK_MODIFIED; 2345 } 2346 2347 if (tb[IFLA_MAP]) { 2348 struct rtnl_link_ifmap *u_map; 2349 struct ifmap k_map; 2350 2351 if (!ops->ndo_set_config) { 2352 err = -EOPNOTSUPP; 2353 goto errout; 2354 } 2355 2356 if (!netif_device_present(dev)) { 2357 err = -ENODEV; 2358 goto errout; 2359 } 2360 2361 u_map = nla_data(tb[IFLA_MAP]); 2362 k_map.mem_start = (unsigned long) u_map->mem_start; 2363 k_map.mem_end = (unsigned long) u_map->mem_end; 2364 k_map.base_addr = (unsigned short) u_map->base_addr; 2365 k_map.irq = (unsigned char) u_map->irq; 2366 k_map.dma = (unsigned char) u_map->dma; 2367 k_map.port = (unsigned char) u_map->port; 2368 2369 err = ops->ndo_set_config(dev, &k_map); 2370 if (err < 0) 2371 goto errout; 2372 2373 status |= DO_SETLINK_NOTIFY; 2374 } 2375 2376 if (tb[IFLA_ADDRESS]) { 2377 struct sockaddr *sa; 2378 int len; 2379 2380 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len, 2381 sizeof(*sa)); 2382 sa = kmalloc(len, GFP_KERNEL); 2383 if (!sa) { 2384 err = -ENOMEM; 2385 goto errout; 2386 } 2387 sa->sa_family = dev->type; 2388 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 2389 dev->addr_len); 2390 err = dev_set_mac_address(dev, sa); 2391 kfree(sa); 2392 if (err) 2393 goto errout; 2394 status |= DO_SETLINK_MODIFIED; 2395 } 2396 2397 if (tb[IFLA_MTU]) { 2398 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack); 2399 if (err < 0) 2400 goto errout; 2401 status |= DO_SETLINK_MODIFIED; 2402 } 2403 2404 if (tb[IFLA_GROUP]) { 2405 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2406 status |= DO_SETLINK_NOTIFY; 2407 } 2408 2409 /* 2410 * Interface selected by interface index but interface 2411 * name provided implies that a name change has been 2412 * requested. 2413 */ 2414 if (ifm->ifi_index > 0 && ifname[0]) { 2415 err = dev_change_name(dev, ifname); 2416 if (err < 0) 2417 goto errout; 2418 status |= DO_SETLINK_MODIFIED; 2419 } 2420 2421 if (tb[IFLA_IFALIAS]) { 2422 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 2423 nla_len(tb[IFLA_IFALIAS])); 2424 if (err < 0) 2425 goto errout; 2426 status |= DO_SETLINK_NOTIFY; 2427 } 2428 2429 if (tb[IFLA_BROADCAST]) { 2430 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 2431 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 2432 } 2433 2434 if (ifm->ifi_flags || ifm->ifi_change) { 2435 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2436 if (err < 0) 2437 goto errout; 2438 } 2439 2440 if (tb[IFLA_MASTER]) { 2441 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); 2442 if (err) 2443 goto errout; 2444 status |= DO_SETLINK_MODIFIED; 2445 } 2446 2447 if (tb[IFLA_CARRIER]) { 2448 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 2449 if (err) 2450 goto errout; 2451 status |= DO_SETLINK_MODIFIED; 2452 } 2453 2454 if (tb[IFLA_TXQLEN]) { 2455 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]); 2456 2457 err = dev_change_tx_queue_len(dev, value); 2458 if (err) 2459 goto errout; 2460 status |= DO_SETLINK_MODIFIED; 2461 } 2462 2463 if (tb[IFLA_GSO_MAX_SIZE]) { 2464 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]); 2465 2466 if (max_size > GSO_MAX_SIZE) { 2467 err = -EINVAL; 2468 goto errout; 2469 } 2470 2471 if (dev->gso_max_size ^ max_size) { 2472 netif_set_gso_max_size(dev, max_size); 2473 status |= DO_SETLINK_MODIFIED; 2474 } 2475 } 2476 2477 if (tb[IFLA_GSO_MAX_SEGS]) { 2478 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]); 2479 2480 if (max_segs > GSO_MAX_SEGS) { 2481 err = -EINVAL; 2482 goto errout; 2483 } 2484 2485 if (dev->gso_max_segs ^ max_segs) { 2486 dev->gso_max_segs = max_segs; 2487 status |= DO_SETLINK_MODIFIED; 2488 } 2489 } 2490 2491 if (tb[IFLA_OPERSTATE]) 2492 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2493 2494 if (tb[IFLA_LINKMODE]) { 2495 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 2496 2497 write_lock_bh(&dev_base_lock); 2498 if (dev->link_mode ^ value) 2499 status |= DO_SETLINK_NOTIFY; 2500 dev->link_mode = value; 2501 write_unlock_bh(&dev_base_lock); 2502 } 2503 2504 if (tb[IFLA_VFINFO_LIST]) { 2505 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 2506 struct nlattr *attr; 2507 int rem; 2508 2509 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 2510 if (nla_type(attr) != IFLA_VF_INFO || 2511 nla_len(attr) < NLA_HDRLEN) { 2512 err = -EINVAL; 2513 goto errout; 2514 } 2515 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 2516 ifla_vf_policy, NULL); 2517 if (err < 0) 2518 goto errout; 2519 err = do_setvfinfo(dev, vfinfo); 2520 if (err < 0) 2521 goto errout; 2522 status |= DO_SETLINK_NOTIFY; 2523 } 2524 } 2525 err = 0; 2526 2527 if (tb[IFLA_VF_PORTS]) { 2528 struct nlattr *port[IFLA_PORT_MAX+1]; 2529 struct nlattr *attr; 2530 int vf; 2531 int rem; 2532 2533 err = -EOPNOTSUPP; 2534 if (!ops->ndo_set_vf_port) 2535 goto errout; 2536 2537 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 2538 if (nla_type(attr) != IFLA_VF_PORT || 2539 nla_len(attr) < NLA_HDRLEN) { 2540 err = -EINVAL; 2541 goto errout; 2542 } 2543 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 2544 ifla_port_policy, NULL); 2545 if (err < 0) 2546 goto errout; 2547 if (!port[IFLA_PORT_VF]) { 2548 err = -EOPNOTSUPP; 2549 goto errout; 2550 } 2551 vf = nla_get_u32(port[IFLA_PORT_VF]); 2552 err = ops->ndo_set_vf_port(dev, vf, port); 2553 if (err < 0) 2554 goto errout; 2555 status |= DO_SETLINK_NOTIFY; 2556 } 2557 } 2558 err = 0; 2559 2560 if (tb[IFLA_PORT_SELF]) { 2561 struct nlattr *port[IFLA_PORT_MAX+1]; 2562 2563 err = nla_parse_nested(port, IFLA_PORT_MAX, 2564 tb[IFLA_PORT_SELF], ifla_port_policy, 2565 NULL); 2566 if (err < 0) 2567 goto errout; 2568 2569 err = -EOPNOTSUPP; 2570 if (ops->ndo_set_vf_port) 2571 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 2572 if (err < 0) 2573 goto errout; 2574 status |= DO_SETLINK_NOTIFY; 2575 } 2576 2577 if (tb[IFLA_AF_SPEC]) { 2578 struct nlattr *af; 2579 int rem; 2580 2581 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2582 const struct rtnl_af_ops *af_ops; 2583 2584 rcu_read_lock(); 2585 2586 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af)))); 2587 2588 err = af_ops->set_link_af(dev, af); 2589 if (err < 0) { 2590 rcu_read_unlock(); 2591 goto errout; 2592 } 2593 2594 rcu_read_unlock(); 2595 status |= DO_SETLINK_NOTIFY; 2596 } 2597 } 2598 err = 0; 2599 2600 if (tb[IFLA_PROTO_DOWN]) { 2601 err = dev_change_proto_down(dev, 2602 nla_get_u8(tb[IFLA_PROTO_DOWN])); 2603 if (err) 2604 goto errout; 2605 status |= DO_SETLINK_NOTIFY; 2606 } 2607 2608 if (tb[IFLA_XDP]) { 2609 struct nlattr *xdp[IFLA_XDP_MAX + 1]; 2610 u32 xdp_flags = 0; 2611 2612 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP], 2613 ifla_xdp_policy, NULL); 2614 if (err < 0) 2615 goto errout; 2616 2617 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) { 2618 err = -EINVAL; 2619 goto errout; 2620 } 2621 2622 if (xdp[IFLA_XDP_FLAGS]) { 2623 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]); 2624 if (xdp_flags & ~XDP_FLAGS_MASK) { 2625 err = -EINVAL; 2626 goto errout; 2627 } 2628 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) { 2629 err = -EINVAL; 2630 goto errout; 2631 } 2632 } 2633 2634 if (xdp[IFLA_XDP_FD]) { 2635 err = dev_change_xdp_fd(dev, extack, 2636 nla_get_s32(xdp[IFLA_XDP_FD]), 2637 xdp_flags); 2638 if (err) 2639 goto errout; 2640 status |= DO_SETLINK_NOTIFY; 2641 } 2642 } 2643 2644 errout: 2645 if (status & DO_SETLINK_MODIFIED) { 2646 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY) 2647 netdev_state_change(dev); 2648 2649 if (err < 0) 2650 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", 2651 dev->name); 2652 } 2653 2654 return err; 2655 } 2656 2657 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 2658 struct netlink_ext_ack *extack) 2659 { 2660 struct net *net = sock_net(skb->sk); 2661 struct ifinfomsg *ifm; 2662 struct net_device *dev; 2663 int err; 2664 struct nlattr *tb[IFLA_MAX+1]; 2665 char ifname[IFNAMSIZ]; 2666 2667 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, 2668 extack); 2669 if (err < 0) 2670 goto errout; 2671 2672 err = rtnl_ensure_unique_netns(tb, extack, false); 2673 if (err < 0) 2674 goto errout; 2675 2676 if (tb[IFLA_IFNAME]) 2677 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2678 else 2679 ifname[0] = '\0'; 2680 2681 err = -EINVAL; 2682 ifm = nlmsg_data(nlh); 2683 if (ifm->ifi_index > 0) 2684 dev = __dev_get_by_index(net, ifm->ifi_index); 2685 else if (tb[IFLA_IFNAME]) 2686 dev = __dev_get_by_name(net, ifname); 2687 else 2688 goto errout; 2689 2690 if (dev == NULL) { 2691 err = -ENODEV; 2692 goto errout; 2693 } 2694 2695 err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0); 2696 errout: 2697 return err; 2698 } 2699 2700 static int rtnl_group_dellink(const struct net *net, int group) 2701 { 2702 struct net_device *dev, *aux; 2703 LIST_HEAD(list_kill); 2704 bool found = false; 2705 2706 if (!group) 2707 return -EPERM; 2708 2709 for_each_netdev(net, dev) { 2710 if (dev->group == group) { 2711 const struct rtnl_link_ops *ops; 2712 2713 found = true; 2714 ops = dev->rtnl_link_ops; 2715 if (!ops || !ops->dellink) 2716 return -EOPNOTSUPP; 2717 } 2718 } 2719 2720 if (!found) 2721 return -ENODEV; 2722 2723 for_each_netdev_safe(net, dev, aux) { 2724 if (dev->group == group) { 2725 const struct rtnl_link_ops *ops; 2726 2727 ops = dev->rtnl_link_ops; 2728 ops->dellink(dev, &list_kill); 2729 } 2730 } 2731 unregister_netdevice_many(&list_kill); 2732 2733 return 0; 2734 } 2735 2736 int rtnl_delete_link(struct net_device *dev) 2737 { 2738 const struct rtnl_link_ops *ops; 2739 LIST_HEAD(list_kill); 2740 2741 ops = dev->rtnl_link_ops; 2742 if (!ops || !ops->dellink) 2743 return -EOPNOTSUPP; 2744 2745 ops->dellink(dev, &list_kill); 2746 unregister_netdevice_many(&list_kill); 2747 2748 return 0; 2749 } 2750 EXPORT_SYMBOL_GPL(rtnl_delete_link); 2751 2752 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 2753 struct netlink_ext_ack *extack) 2754 { 2755 struct net *net = sock_net(skb->sk); 2756 struct net *tgt_net = net; 2757 struct net_device *dev = NULL; 2758 struct ifinfomsg *ifm; 2759 char ifname[IFNAMSIZ]; 2760 struct nlattr *tb[IFLA_MAX+1]; 2761 int err; 2762 int netnsid = -1; 2763 2764 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack); 2765 if (err < 0) 2766 return err; 2767 2768 err = rtnl_ensure_unique_netns(tb, extack, true); 2769 if (err < 0) 2770 return err; 2771 2772 if (tb[IFLA_IFNAME]) 2773 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2774 2775 if (tb[IFLA_TARGET_NETNSID]) { 2776 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 2777 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid); 2778 if (IS_ERR(tgt_net)) 2779 return PTR_ERR(tgt_net); 2780 } 2781 2782 err = -EINVAL; 2783 ifm = nlmsg_data(nlh); 2784 if (ifm->ifi_index > 0) 2785 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 2786 else if (tb[IFLA_IFNAME]) 2787 dev = __dev_get_by_name(tgt_net, ifname); 2788 else if (tb[IFLA_GROUP]) 2789 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP])); 2790 else 2791 goto out; 2792 2793 if (!dev) { 2794 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0) 2795 err = -ENODEV; 2796 2797 goto out; 2798 } 2799 2800 err = rtnl_delete_link(dev); 2801 2802 out: 2803 if (netnsid >= 0) 2804 put_net(tgt_net); 2805 2806 return err; 2807 } 2808 2809 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 2810 { 2811 unsigned int old_flags; 2812 int err; 2813 2814 old_flags = dev->flags; 2815 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2816 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2817 if (err < 0) 2818 return err; 2819 } 2820 2821 if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) { 2822 __dev_notify_flags(dev, old_flags, 0U); 2823 } else { 2824 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2825 __dev_notify_flags(dev, old_flags, ~0U); 2826 } 2827 return 0; 2828 } 2829 EXPORT_SYMBOL(rtnl_configure_link); 2830 2831 struct net_device *rtnl_create_link(struct net *net, 2832 const char *ifname, unsigned char name_assign_type, 2833 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2834 { 2835 struct net_device *dev; 2836 unsigned int num_tx_queues = 1; 2837 unsigned int num_rx_queues = 1; 2838 2839 if (tb[IFLA_NUM_TX_QUEUES]) 2840 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2841 else if (ops->get_num_tx_queues) 2842 num_tx_queues = ops->get_num_tx_queues(); 2843 2844 if (tb[IFLA_NUM_RX_QUEUES]) 2845 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2846 else if (ops->get_num_rx_queues) 2847 num_rx_queues = ops->get_num_rx_queues(); 2848 2849 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2850 ops->setup, num_tx_queues, num_rx_queues); 2851 if (!dev) 2852 return ERR_PTR(-ENOMEM); 2853 2854 dev_net_set(dev, net); 2855 dev->rtnl_link_ops = ops; 2856 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2857 2858 if (tb[IFLA_MTU]) 2859 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2860 if (tb[IFLA_ADDRESS]) { 2861 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2862 nla_len(tb[IFLA_ADDRESS])); 2863 dev->addr_assign_type = NET_ADDR_SET; 2864 } 2865 if (tb[IFLA_BROADCAST]) 2866 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2867 nla_len(tb[IFLA_BROADCAST])); 2868 if (tb[IFLA_TXQLEN]) 2869 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2870 if (tb[IFLA_OPERSTATE]) 2871 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2872 if (tb[IFLA_LINKMODE]) 2873 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2874 if (tb[IFLA_GROUP]) 2875 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2876 if (tb[IFLA_GSO_MAX_SIZE]) 2877 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE])); 2878 if (tb[IFLA_GSO_MAX_SEGS]) 2879 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]); 2880 2881 return dev; 2882 } 2883 EXPORT_SYMBOL(rtnl_create_link); 2884 2885 static int rtnl_group_changelink(const struct sk_buff *skb, 2886 struct net *net, int group, 2887 struct ifinfomsg *ifm, 2888 struct netlink_ext_ack *extack, 2889 struct nlattr **tb) 2890 { 2891 struct net_device *dev, *aux; 2892 int err; 2893 2894 for_each_netdev_safe(net, dev, aux) { 2895 if (dev->group == group) { 2896 err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0); 2897 if (err < 0) 2898 return err; 2899 } 2900 } 2901 2902 return 0; 2903 } 2904 2905 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, 2906 struct netlink_ext_ack *extack) 2907 { 2908 struct net *net = sock_net(skb->sk); 2909 const struct rtnl_link_ops *ops; 2910 const struct rtnl_link_ops *m_ops = NULL; 2911 struct net_device *dev; 2912 struct net_device *master_dev = NULL; 2913 struct ifinfomsg *ifm; 2914 char kind[MODULE_NAME_LEN]; 2915 char ifname[IFNAMSIZ]; 2916 struct nlattr *tb[IFLA_MAX+1]; 2917 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2918 unsigned char name_assign_type = NET_NAME_USER; 2919 int err; 2920 2921 #ifdef CONFIG_MODULES 2922 replay: 2923 #endif 2924 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack); 2925 if (err < 0) 2926 return err; 2927 2928 err = rtnl_ensure_unique_netns(tb, extack, false); 2929 if (err < 0) 2930 return err; 2931 2932 if (tb[IFLA_IFNAME]) 2933 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2934 else 2935 ifname[0] = '\0'; 2936 2937 ifm = nlmsg_data(nlh); 2938 if (ifm->ifi_index > 0) 2939 dev = __dev_get_by_index(net, ifm->ifi_index); 2940 else { 2941 if (ifname[0]) 2942 dev = __dev_get_by_name(net, ifname); 2943 else 2944 dev = NULL; 2945 } 2946 2947 if (dev) { 2948 master_dev = netdev_master_upper_dev_get(dev); 2949 if (master_dev) 2950 m_ops = master_dev->rtnl_link_ops; 2951 } 2952 2953 err = validate_linkmsg(dev, tb); 2954 if (err < 0) 2955 return err; 2956 2957 if (tb[IFLA_LINKINFO]) { 2958 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2959 tb[IFLA_LINKINFO], ifla_info_policy, 2960 NULL); 2961 if (err < 0) 2962 return err; 2963 } else 2964 memset(linkinfo, 0, sizeof(linkinfo)); 2965 2966 if (linkinfo[IFLA_INFO_KIND]) { 2967 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2968 ops = rtnl_link_ops_get(kind); 2969 } else { 2970 kind[0] = '\0'; 2971 ops = NULL; 2972 } 2973 2974 if (1) { 2975 struct nlattr *attr[RTNL_MAX_TYPE + 1]; 2976 struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1]; 2977 struct nlattr **data = NULL; 2978 struct nlattr **slave_data = NULL; 2979 struct net *dest_net, *link_net = NULL; 2980 2981 if (ops) { 2982 if (ops->maxtype > RTNL_MAX_TYPE) 2983 return -EINVAL; 2984 2985 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2986 err = nla_parse_nested(attr, ops->maxtype, 2987 linkinfo[IFLA_INFO_DATA], 2988 ops->policy, NULL); 2989 if (err < 0) 2990 return err; 2991 data = attr; 2992 } 2993 if (ops->validate) { 2994 err = ops->validate(tb, data, extack); 2995 if (err < 0) 2996 return err; 2997 } 2998 } 2999 3000 if (m_ops) { 3001 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE) 3002 return -EINVAL; 3003 3004 if (m_ops->slave_maxtype && 3005 linkinfo[IFLA_INFO_SLAVE_DATA]) { 3006 err = nla_parse_nested(slave_attr, 3007 m_ops->slave_maxtype, 3008 linkinfo[IFLA_INFO_SLAVE_DATA], 3009 m_ops->slave_policy, 3010 NULL); 3011 if (err < 0) 3012 return err; 3013 slave_data = slave_attr; 3014 } 3015 } 3016 3017 if (dev) { 3018 int status = 0; 3019 3020 if (nlh->nlmsg_flags & NLM_F_EXCL) 3021 return -EEXIST; 3022 if (nlh->nlmsg_flags & NLM_F_REPLACE) 3023 return -EOPNOTSUPP; 3024 3025 if (linkinfo[IFLA_INFO_DATA]) { 3026 if (!ops || ops != dev->rtnl_link_ops || 3027 !ops->changelink) 3028 return -EOPNOTSUPP; 3029 3030 err = ops->changelink(dev, tb, data, extack); 3031 if (err < 0) 3032 return err; 3033 status |= DO_SETLINK_NOTIFY; 3034 } 3035 3036 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 3037 if (!m_ops || !m_ops->slave_changelink) 3038 return -EOPNOTSUPP; 3039 3040 err = m_ops->slave_changelink(master_dev, dev, 3041 tb, slave_data, 3042 extack); 3043 if (err < 0) 3044 return err; 3045 status |= DO_SETLINK_NOTIFY; 3046 } 3047 3048 return do_setlink(skb, dev, ifm, extack, tb, ifname, 3049 status); 3050 } 3051 3052 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 3053 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 3054 return rtnl_group_changelink(skb, net, 3055 nla_get_u32(tb[IFLA_GROUP]), 3056 ifm, extack, tb); 3057 return -ENODEV; 3058 } 3059 3060 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO]) 3061 return -EOPNOTSUPP; 3062 3063 if (!ops) { 3064 #ifdef CONFIG_MODULES 3065 if (kind[0]) { 3066 __rtnl_unlock(); 3067 request_module("rtnl-link-%s", kind); 3068 rtnl_lock(); 3069 ops = rtnl_link_ops_get(kind); 3070 if (ops) 3071 goto replay; 3072 } 3073 #endif 3074 return -EOPNOTSUPP; 3075 } 3076 3077 if (!ops->setup) 3078 return -EOPNOTSUPP; 3079 3080 if (!ifname[0]) { 3081 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 3082 name_assign_type = NET_NAME_ENUM; 3083 } 3084 3085 dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN); 3086 if (IS_ERR(dest_net)) 3087 return PTR_ERR(dest_net); 3088 3089 if (tb[IFLA_LINK_NETNSID]) { 3090 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 3091 3092 link_net = get_net_ns_by_id(dest_net, id); 3093 if (!link_net) { 3094 err = -EINVAL; 3095 goto out; 3096 } 3097 err = -EPERM; 3098 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 3099 goto out; 3100 } 3101 3102 dev = rtnl_create_link(link_net ? : dest_net, ifname, 3103 name_assign_type, ops, tb); 3104 if (IS_ERR(dev)) { 3105 err = PTR_ERR(dev); 3106 goto out; 3107 } 3108 3109 dev->ifindex = ifm->ifi_index; 3110 3111 if (ops->newlink) { 3112 err = ops->newlink(link_net ? : net, dev, tb, data, 3113 extack); 3114 /* Drivers should call free_netdev() in ->destructor 3115 * and unregister it on failure after registration 3116 * so that device could be finally freed in rtnl_unlock. 3117 */ 3118 if (err < 0) { 3119 /* If device is not registered at all, free it now */ 3120 if (dev->reg_state == NETREG_UNINITIALIZED) 3121 free_netdev(dev); 3122 goto out; 3123 } 3124 } else { 3125 err = register_netdevice(dev); 3126 if (err < 0) { 3127 free_netdev(dev); 3128 goto out; 3129 } 3130 } 3131 err = rtnl_configure_link(dev, ifm); 3132 if (err < 0) 3133 goto out_unregister; 3134 if (link_net) { 3135 err = dev_change_net_namespace(dev, dest_net, ifname); 3136 if (err < 0) 3137 goto out_unregister; 3138 } 3139 if (tb[IFLA_MASTER]) { 3140 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), 3141 extack); 3142 if (err) 3143 goto out_unregister; 3144 } 3145 out: 3146 if (link_net) 3147 put_net(link_net); 3148 put_net(dest_net); 3149 return err; 3150 out_unregister: 3151 if (ops->newlink) { 3152 LIST_HEAD(list_kill); 3153 3154 ops->dellink(dev, &list_kill); 3155 unregister_netdevice_many(&list_kill); 3156 } else { 3157 unregister_netdevice(dev); 3158 } 3159 goto out; 3160 } 3161 } 3162 3163 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh, 3164 struct netlink_ext_ack *extack) 3165 { 3166 struct net *net = sock_net(skb->sk); 3167 struct net *tgt_net = net; 3168 struct ifinfomsg *ifm; 3169 char ifname[IFNAMSIZ]; 3170 struct nlattr *tb[IFLA_MAX+1]; 3171 struct net_device *dev = NULL; 3172 struct sk_buff *nskb; 3173 int netnsid = -1; 3174 int err; 3175 u32 ext_filter_mask = 0; 3176 3177 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack); 3178 if (err < 0) 3179 return err; 3180 3181 err = rtnl_ensure_unique_netns(tb, extack, true); 3182 if (err < 0) 3183 return err; 3184 3185 if (tb[IFLA_TARGET_NETNSID]) { 3186 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]); 3187 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid); 3188 if (IS_ERR(tgt_net)) 3189 return PTR_ERR(tgt_net); 3190 } 3191 3192 if (tb[IFLA_IFNAME]) 3193 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 3194 3195 if (tb[IFLA_EXT_MASK]) 3196 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 3197 3198 err = -EINVAL; 3199 ifm = nlmsg_data(nlh); 3200 if (ifm->ifi_index > 0) 3201 dev = __dev_get_by_index(tgt_net, ifm->ifi_index); 3202 else if (tb[IFLA_IFNAME]) 3203 dev = __dev_get_by_name(tgt_net, ifname); 3204 else 3205 goto out; 3206 3207 err = -ENODEV; 3208 if (dev == NULL) 3209 goto out; 3210 3211 err = -ENOBUFS; 3212 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 3213 if (nskb == NULL) 3214 goto out; 3215 3216 err = rtnl_fill_ifinfo(nskb, dev, net, 3217 RTM_NEWLINK, NETLINK_CB(skb).portid, 3218 nlh->nlmsg_seq, 0, 0, ext_filter_mask, 3219 0, NULL, 0, netnsid); 3220 if (err < 0) { 3221 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 3222 WARN_ON(err == -EMSGSIZE); 3223 kfree_skb(nskb); 3224 } else 3225 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 3226 out: 3227 if (netnsid >= 0) 3228 put_net(tgt_net); 3229 3230 return err; 3231 } 3232 3233 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 3234 { 3235 struct net *net = sock_net(skb->sk); 3236 struct net_device *dev; 3237 struct nlattr *tb[IFLA_MAX+1]; 3238 u32 ext_filter_mask = 0; 3239 u16 min_ifinfo_dump_size = 0; 3240 int hdrlen; 3241 3242 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 3243 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 3244 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 3245 3246 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) { 3247 if (tb[IFLA_EXT_MASK]) 3248 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 3249 } 3250 3251 if (!ext_filter_mask) 3252 return NLMSG_GOODSIZE; 3253 /* 3254 * traverse the list of net devices and compute the minimum 3255 * buffer size based upon the filter mask. 3256 */ 3257 rcu_read_lock(); 3258 for_each_netdev_rcu(net, dev) { 3259 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 3260 if_nlmsg_size(dev, 3261 ext_filter_mask)); 3262 } 3263 rcu_read_unlock(); 3264 3265 return nlmsg_total_size(min_ifinfo_dump_size); 3266 } 3267 3268 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 3269 { 3270 int idx; 3271 int s_idx = cb->family; 3272 int type = cb->nlh->nlmsg_type - RTM_BASE; 3273 3274 if (s_idx == 0) 3275 s_idx = 1; 3276 3277 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 3278 struct rtnl_link **tab; 3279 struct rtnl_link *link; 3280 rtnl_dumpit_func dumpit; 3281 3282 if (idx < s_idx || idx == PF_PACKET) 3283 continue; 3284 3285 if (type < 0 || type >= RTM_NR_MSGTYPES) 3286 continue; 3287 3288 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]); 3289 if (!tab) 3290 continue; 3291 3292 link = tab[type]; 3293 if (!link) 3294 continue; 3295 3296 dumpit = link->dumpit; 3297 if (!dumpit) 3298 continue; 3299 3300 if (idx > s_idx) { 3301 memset(&cb->args[0], 0, sizeof(cb->args)); 3302 cb->prev_seq = 0; 3303 cb->seq = 0; 3304 } 3305 if (dumpit(skb, cb)) 3306 break; 3307 } 3308 cb->family = idx; 3309 3310 return skb->len; 3311 } 3312 3313 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 3314 unsigned int change, 3315 u32 event, gfp_t flags, int *new_nsid, 3316 int new_ifindex) 3317 { 3318 struct net *net = dev_net(dev); 3319 struct sk_buff *skb; 3320 int err = -ENOBUFS; 3321 size_t if_info_size; 3322 3323 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 3324 if (skb == NULL) 3325 goto errout; 3326 3327 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev), 3328 type, 0, 0, change, 0, 0, event, 3329 new_nsid, new_ifindex, -1); 3330 if (err < 0) { 3331 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 3332 WARN_ON(err == -EMSGSIZE); 3333 kfree_skb(skb); 3334 goto errout; 3335 } 3336 return skb; 3337 errout: 3338 if (err < 0) 3339 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3340 return NULL; 3341 } 3342 3343 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 3344 { 3345 struct net *net = dev_net(dev); 3346 3347 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 3348 } 3349 3350 static void rtmsg_ifinfo_event(int type, struct net_device *dev, 3351 unsigned int change, u32 event, 3352 gfp_t flags, int *new_nsid, int new_ifindex) 3353 { 3354 struct sk_buff *skb; 3355 3356 if (dev->reg_state != NETREG_REGISTERED) 3357 return; 3358 3359 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid, 3360 new_ifindex); 3361 if (skb) 3362 rtmsg_ifinfo_send(skb, dev, flags); 3363 } 3364 3365 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 3366 gfp_t flags) 3367 { 3368 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 3369 NULL, 0); 3370 } 3371 3372 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 3373 gfp_t flags, int *new_nsid, int new_ifindex) 3374 { 3375 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, 3376 new_nsid, new_ifindex); 3377 } 3378 3379 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 3380 struct net_device *dev, 3381 u8 *addr, u16 vid, u32 pid, u32 seq, 3382 int type, unsigned int flags, 3383 int nlflags, u16 ndm_state) 3384 { 3385 struct nlmsghdr *nlh; 3386 struct ndmsg *ndm; 3387 3388 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 3389 if (!nlh) 3390 return -EMSGSIZE; 3391 3392 ndm = nlmsg_data(nlh); 3393 ndm->ndm_family = AF_BRIDGE; 3394 ndm->ndm_pad1 = 0; 3395 ndm->ndm_pad2 = 0; 3396 ndm->ndm_flags = flags; 3397 ndm->ndm_type = 0; 3398 ndm->ndm_ifindex = dev->ifindex; 3399 ndm->ndm_state = ndm_state; 3400 3401 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 3402 goto nla_put_failure; 3403 if (vid) 3404 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 3405 goto nla_put_failure; 3406 3407 nlmsg_end(skb, nlh); 3408 return 0; 3409 3410 nla_put_failure: 3411 nlmsg_cancel(skb, nlh); 3412 return -EMSGSIZE; 3413 } 3414 3415 static inline size_t rtnl_fdb_nlmsg_size(void) 3416 { 3417 return NLMSG_ALIGN(sizeof(struct ndmsg)) + 3418 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */ 3419 nla_total_size(sizeof(u16)) + /* NDA_VLAN */ 3420 0; 3421 } 3422 3423 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 3424 u16 ndm_state) 3425 { 3426 struct net *net = dev_net(dev); 3427 struct sk_buff *skb; 3428 int err = -ENOBUFS; 3429 3430 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 3431 if (!skb) 3432 goto errout; 3433 3434 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 3435 0, 0, type, NTF_SELF, 0, ndm_state); 3436 if (err < 0) { 3437 kfree_skb(skb); 3438 goto errout; 3439 } 3440 3441 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 3442 return; 3443 errout: 3444 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 3445 } 3446 3447 /** 3448 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 3449 */ 3450 int ndo_dflt_fdb_add(struct ndmsg *ndm, 3451 struct nlattr *tb[], 3452 struct net_device *dev, 3453 const unsigned char *addr, u16 vid, 3454 u16 flags) 3455 { 3456 int err = -EINVAL; 3457 3458 /* If aging addresses are supported device will need to 3459 * implement its own handler for this. 3460 */ 3461 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 3462 pr_info("%s: FDB only supports static addresses\n", dev->name); 3463 return err; 3464 } 3465 3466 if (vid) { 3467 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 3468 return err; 3469 } 3470 3471 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 3472 err = dev_uc_add_excl(dev, addr); 3473 else if (is_multicast_ether_addr(addr)) 3474 err = dev_mc_add_excl(dev, addr); 3475 3476 /* Only return duplicate errors if NLM_F_EXCL is set */ 3477 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 3478 err = 0; 3479 3480 return err; 3481 } 3482 EXPORT_SYMBOL(ndo_dflt_fdb_add); 3483 3484 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid, 3485 struct netlink_ext_ack *extack) 3486 { 3487 u16 vid = 0; 3488 3489 if (vlan_attr) { 3490 if (nla_len(vlan_attr) != sizeof(u16)) { 3491 NL_SET_ERR_MSG(extack, "invalid vlan attribute size"); 3492 return -EINVAL; 3493 } 3494 3495 vid = nla_get_u16(vlan_attr); 3496 3497 if (!vid || vid >= VLAN_VID_MASK) { 3498 NL_SET_ERR_MSG(extack, "invalid vlan id"); 3499 return -EINVAL; 3500 } 3501 } 3502 *p_vid = vid; 3503 return 0; 3504 } 3505 3506 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, 3507 struct netlink_ext_ack *extack) 3508 { 3509 struct net *net = sock_net(skb->sk); 3510 struct ndmsg *ndm; 3511 struct nlattr *tb[NDA_MAX+1]; 3512 struct net_device *dev; 3513 u8 *addr; 3514 u16 vid; 3515 int err; 3516 3517 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack); 3518 if (err < 0) 3519 return err; 3520 3521 ndm = nlmsg_data(nlh); 3522 if (ndm->ndm_ifindex == 0) { 3523 NL_SET_ERR_MSG(extack, "invalid ifindex"); 3524 return -EINVAL; 3525 } 3526 3527 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 3528 if (dev == NULL) { 3529 NL_SET_ERR_MSG(extack, "unknown ifindex"); 3530 return -ENODEV; 3531 } 3532 3533 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 3534 NL_SET_ERR_MSG(extack, "invalid address"); 3535 return -EINVAL; 3536 } 3537 3538 addr = nla_data(tb[NDA_LLADDR]); 3539 3540 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 3541 if (err) 3542 return err; 3543 3544 err = -EOPNOTSUPP; 3545 3546 /* Support fdb on master device the net/bridge default case */ 3547 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 3548 (dev->priv_flags & IFF_BRIDGE_PORT)) { 3549 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3550 const struct net_device_ops *ops = br_dev->netdev_ops; 3551 3552 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 3553 nlh->nlmsg_flags); 3554 if (err) 3555 goto out; 3556 else 3557 ndm->ndm_flags &= ~NTF_MASTER; 3558 } 3559 3560 /* Embedded bridge, macvlan, and any other device support */ 3561 if ((ndm->ndm_flags & NTF_SELF)) { 3562 if (dev->netdev_ops->ndo_fdb_add) 3563 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 3564 vid, 3565 nlh->nlmsg_flags); 3566 else 3567 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 3568 nlh->nlmsg_flags); 3569 3570 if (!err) { 3571 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 3572 ndm->ndm_state); 3573 ndm->ndm_flags &= ~NTF_SELF; 3574 } 3575 } 3576 out: 3577 return err; 3578 } 3579 3580 /** 3581 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 3582 */ 3583 int ndo_dflt_fdb_del(struct ndmsg *ndm, 3584 struct nlattr *tb[], 3585 struct net_device *dev, 3586 const unsigned char *addr, u16 vid) 3587 { 3588 int err = -EINVAL; 3589 3590 /* If aging addresses are supported device will need to 3591 * implement its own handler for this. 3592 */ 3593 if (!(ndm->ndm_state & NUD_PERMANENT)) { 3594 pr_info("%s: FDB only supports static addresses\n", dev->name); 3595 return err; 3596 } 3597 3598 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 3599 err = dev_uc_del(dev, addr); 3600 else if (is_multicast_ether_addr(addr)) 3601 err = dev_mc_del(dev, addr); 3602 3603 return err; 3604 } 3605 EXPORT_SYMBOL(ndo_dflt_fdb_del); 3606 3607 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, 3608 struct netlink_ext_ack *extack) 3609 { 3610 struct net *net = sock_net(skb->sk); 3611 struct ndmsg *ndm; 3612 struct nlattr *tb[NDA_MAX+1]; 3613 struct net_device *dev; 3614 int err = -EINVAL; 3615 __u8 *addr; 3616 u16 vid; 3617 3618 if (!netlink_capable(skb, CAP_NET_ADMIN)) 3619 return -EPERM; 3620 3621 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack); 3622 if (err < 0) 3623 return err; 3624 3625 ndm = nlmsg_data(nlh); 3626 if (ndm->ndm_ifindex == 0) { 3627 NL_SET_ERR_MSG(extack, "invalid ifindex"); 3628 return -EINVAL; 3629 } 3630 3631 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 3632 if (dev == NULL) { 3633 NL_SET_ERR_MSG(extack, "unknown ifindex"); 3634 return -ENODEV; 3635 } 3636 3637 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 3638 NL_SET_ERR_MSG(extack, "invalid address"); 3639 return -EINVAL; 3640 } 3641 3642 addr = nla_data(tb[NDA_LLADDR]); 3643 3644 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack); 3645 if (err) 3646 return err; 3647 3648 err = -EOPNOTSUPP; 3649 3650 /* Support fdb on master device the net/bridge default case */ 3651 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 3652 (dev->priv_flags & IFF_BRIDGE_PORT)) { 3653 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3654 const struct net_device_ops *ops = br_dev->netdev_ops; 3655 3656 if (ops->ndo_fdb_del) 3657 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 3658 3659 if (err) 3660 goto out; 3661 else 3662 ndm->ndm_flags &= ~NTF_MASTER; 3663 } 3664 3665 /* Embedded bridge, macvlan, and any other device support */ 3666 if (ndm->ndm_flags & NTF_SELF) { 3667 if (dev->netdev_ops->ndo_fdb_del) 3668 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 3669 vid); 3670 else 3671 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 3672 3673 if (!err) { 3674 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 3675 ndm->ndm_state); 3676 ndm->ndm_flags &= ~NTF_SELF; 3677 } 3678 } 3679 out: 3680 return err; 3681 } 3682 3683 static int nlmsg_populate_fdb(struct sk_buff *skb, 3684 struct netlink_callback *cb, 3685 struct net_device *dev, 3686 int *idx, 3687 struct netdev_hw_addr_list *list) 3688 { 3689 struct netdev_hw_addr *ha; 3690 int err; 3691 u32 portid, seq; 3692 3693 portid = NETLINK_CB(cb->skb).portid; 3694 seq = cb->nlh->nlmsg_seq; 3695 3696 list_for_each_entry(ha, &list->list, list) { 3697 if (*idx < cb->args[2]) 3698 goto skip; 3699 3700 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 3701 portid, seq, 3702 RTM_NEWNEIGH, NTF_SELF, 3703 NLM_F_MULTI, NUD_PERMANENT); 3704 if (err < 0) 3705 return err; 3706 skip: 3707 *idx += 1; 3708 } 3709 return 0; 3710 } 3711 3712 /** 3713 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 3714 * @nlh: netlink message header 3715 * @dev: netdevice 3716 * 3717 * Default netdevice operation to dump the existing unicast address list. 3718 * Returns number of addresses from list put in skb. 3719 */ 3720 int ndo_dflt_fdb_dump(struct sk_buff *skb, 3721 struct netlink_callback *cb, 3722 struct net_device *dev, 3723 struct net_device *filter_dev, 3724 int *idx) 3725 { 3726 int err; 3727 3728 netif_addr_lock_bh(dev); 3729 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc); 3730 if (err) 3731 goto out; 3732 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc); 3733 out: 3734 netif_addr_unlock_bh(dev); 3735 return err; 3736 } 3737 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 3738 3739 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 3740 { 3741 struct net_device *dev; 3742 struct nlattr *tb[IFLA_MAX+1]; 3743 struct net_device *br_dev = NULL; 3744 const struct net_device_ops *ops = NULL; 3745 const struct net_device_ops *cops = NULL; 3746 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 3747 struct net *net = sock_net(skb->sk); 3748 struct hlist_head *head; 3749 int brport_idx = 0; 3750 int br_idx = 0; 3751 int h, s_h; 3752 int idx = 0, s_idx; 3753 int err = 0; 3754 int fidx = 0; 3755 3756 err = nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, 3757 IFLA_MAX, ifla_policy, NULL); 3758 if (err < 0) { 3759 return -EINVAL; 3760 } else if (err == 0) { 3761 if (tb[IFLA_MASTER]) 3762 br_idx = nla_get_u32(tb[IFLA_MASTER]); 3763 } 3764 3765 brport_idx = ifm->ifi_index; 3766 3767 if (br_idx) { 3768 br_dev = __dev_get_by_index(net, br_idx); 3769 if (!br_dev) 3770 return -ENODEV; 3771 3772 ops = br_dev->netdev_ops; 3773 } 3774 3775 s_h = cb->args[0]; 3776 s_idx = cb->args[1]; 3777 3778 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3779 idx = 0; 3780 head = &net->dev_index_head[h]; 3781 hlist_for_each_entry(dev, head, index_hlist) { 3782 3783 if (brport_idx && (dev->ifindex != brport_idx)) 3784 continue; 3785 3786 if (!br_idx) { /* user did not specify a specific bridge */ 3787 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3788 br_dev = netdev_master_upper_dev_get(dev); 3789 cops = br_dev->netdev_ops; 3790 } 3791 } else { 3792 if (dev != br_dev && 3793 !(dev->priv_flags & IFF_BRIDGE_PORT)) 3794 continue; 3795 3796 if (br_dev != netdev_master_upper_dev_get(dev) && 3797 !(dev->priv_flags & IFF_EBRIDGE)) 3798 continue; 3799 cops = ops; 3800 } 3801 3802 if (idx < s_idx) 3803 goto cont; 3804 3805 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3806 if (cops && cops->ndo_fdb_dump) { 3807 err = cops->ndo_fdb_dump(skb, cb, 3808 br_dev, dev, 3809 &fidx); 3810 if (err == -EMSGSIZE) 3811 goto out; 3812 } 3813 } 3814 3815 if (dev->netdev_ops->ndo_fdb_dump) 3816 err = dev->netdev_ops->ndo_fdb_dump(skb, cb, 3817 dev, NULL, 3818 &fidx); 3819 else 3820 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, 3821 &fidx); 3822 if (err == -EMSGSIZE) 3823 goto out; 3824 3825 cops = NULL; 3826 3827 /* reset fdb offset to 0 for rest of the interfaces */ 3828 cb->args[2] = 0; 3829 fidx = 0; 3830 cont: 3831 idx++; 3832 } 3833 } 3834 3835 out: 3836 cb->args[0] = h; 3837 cb->args[1] = idx; 3838 cb->args[2] = fidx; 3839 3840 return skb->len; 3841 } 3842 3843 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 3844 unsigned int attrnum, unsigned int flag) 3845 { 3846 if (mask & flag) 3847 return nla_put_u8(skb, attrnum, !!(flags & flag)); 3848 return 0; 3849 } 3850 3851 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 3852 struct net_device *dev, u16 mode, 3853 u32 flags, u32 mask, int nlflags, 3854 u32 filter_mask, 3855 int (*vlan_fill)(struct sk_buff *skb, 3856 struct net_device *dev, 3857 u32 filter_mask)) 3858 { 3859 struct nlmsghdr *nlh; 3860 struct ifinfomsg *ifm; 3861 struct nlattr *br_afspec; 3862 struct nlattr *protinfo; 3863 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 3864 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3865 int err = 0; 3866 3867 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 3868 if (nlh == NULL) 3869 return -EMSGSIZE; 3870 3871 ifm = nlmsg_data(nlh); 3872 ifm->ifi_family = AF_BRIDGE; 3873 ifm->__ifi_pad = 0; 3874 ifm->ifi_type = dev->type; 3875 ifm->ifi_index = dev->ifindex; 3876 ifm->ifi_flags = dev_get_flags(dev); 3877 ifm->ifi_change = 0; 3878 3879 3880 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 3881 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 3882 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 3883 (br_dev && 3884 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 3885 (dev->addr_len && 3886 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 3887 (dev->ifindex != dev_get_iflink(dev) && 3888 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 3889 goto nla_put_failure; 3890 3891 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 3892 if (!br_afspec) 3893 goto nla_put_failure; 3894 3895 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 3896 nla_nest_cancel(skb, br_afspec); 3897 goto nla_put_failure; 3898 } 3899 3900 if (mode != BRIDGE_MODE_UNDEF) { 3901 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 3902 nla_nest_cancel(skb, br_afspec); 3903 goto nla_put_failure; 3904 } 3905 } 3906 if (vlan_fill) { 3907 err = vlan_fill(skb, dev, filter_mask); 3908 if (err) { 3909 nla_nest_cancel(skb, br_afspec); 3910 goto nla_put_failure; 3911 } 3912 } 3913 nla_nest_end(skb, br_afspec); 3914 3915 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 3916 if (!protinfo) 3917 goto nla_put_failure; 3918 3919 if (brport_nla_put_flag(skb, flags, mask, 3920 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 3921 brport_nla_put_flag(skb, flags, mask, 3922 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 3923 brport_nla_put_flag(skb, flags, mask, 3924 IFLA_BRPORT_FAST_LEAVE, 3925 BR_MULTICAST_FAST_LEAVE) || 3926 brport_nla_put_flag(skb, flags, mask, 3927 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 3928 brport_nla_put_flag(skb, flags, mask, 3929 IFLA_BRPORT_LEARNING, BR_LEARNING) || 3930 brport_nla_put_flag(skb, flags, mask, 3931 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 3932 brport_nla_put_flag(skb, flags, mask, 3933 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3934 brport_nla_put_flag(skb, flags, mask, 3935 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3936 nla_nest_cancel(skb, protinfo); 3937 goto nla_put_failure; 3938 } 3939 3940 nla_nest_end(skb, protinfo); 3941 3942 nlmsg_end(skb, nlh); 3943 return 0; 3944 nla_put_failure: 3945 nlmsg_cancel(skb, nlh); 3946 return err ? err : -EMSGSIZE; 3947 } 3948 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3949 3950 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3951 { 3952 struct net *net = sock_net(skb->sk); 3953 struct net_device *dev; 3954 int idx = 0; 3955 u32 portid = NETLINK_CB(cb->skb).portid; 3956 u32 seq = cb->nlh->nlmsg_seq; 3957 u32 filter_mask = 0; 3958 int err; 3959 3960 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3961 struct nlattr *extfilt; 3962 3963 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3964 IFLA_EXT_MASK); 3965 if (extfilt) { 3966 if (nla_len(extfilt) < sizeof(filter_mask)) 3967 return -EINVAL; 3968 3969 filter_mask = nla_get_u32(extfilt); 3970 } 3971 } 3972 3973 rcu_read_lock(); 3974 for_each_netdev_rcu(net, dev) { 3975 const struct net_device_ops *ops = dev->netdev_ops; 3976 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3977 3978 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3979 if (idx >= cb->args[0]) { 3980 err = br_dev->netdev_ops->ndo_bridge_getlink( 3981 skb, portid, seq, dev, 3982 filter_mask, NLM_F_MULTI); 3983 if (err < 0 && err != -EOPNOTSUPP) { 3984 if (likely(skb->len)) 3985 break; 3986 3987 goto out_err; 3988 } 3989 } 3990 idx++; 3991 } 3992 3993 if (ops->ndo_bridge_getlink) { 3994 if (idx >= cb->args[0]) { 3995 err = ops->ndo_bridge_getlink(skb, portid, 3996 seq, dev, 3997 filter_mask, 3998 NLM_F_MULTI); 3999 if (err < 0 && err != -EOPNOTSUPP) { 4000 if (likely(skb->len)) 4001 break; 4002 4003 goto out_err; 4004 } 4005 } 4006 idx++; 4007 } 4008 } 4009 err = skb->len; 4010 out_err: 4011 rcu_read_unlock(); 4012 cb->args[0] = idx; 4013 4014 return err; 4015 } 4016 4017 static inline size_t bridge_nlmsg_size(void) 4018 { 4019 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4020 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4021 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4022 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 4023 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 4024 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 4025 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 4026 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 4027 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 4028 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 4029 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 4030 } 4031 4032 static int rtnl_bridge_notify(struct net_device *dev) 4033 { 4034 struct net *net = dev_net(dev); 4035 struct sk_buff *skb; 4036 int err = -EOPNOTSUPP; 4037 4038 if (!dev->netdev_ops->ndo_bridge_getlink) 4039 return 0; 4040 4041 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 4042 if (!skb) { 4043 err = -ENOMEM; 4044 goto errout; 4045 } 4046 4047 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 4048 if (err < 0) 4049 goto errout; 4050 4051 if (!skb->len) 4052 goto errout; 4053 4054 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 4055 return 0; 4056 errout: 4057 WARN_ON(err == -EMSGSIZE); 4058 kfree_skb(skb); 4059 if (err) 4060 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 4061 return err; 4062 } 4063 4064 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 4065 struct netlink_ext_ack *extack) 4066 { 4067 struct net *net = sock_net(skb->sk); 4068 struct ifinfomsg *ifm; 4069 struct net_device *dev; 4070 struct nlattr *br_spec, *attr = NULL; 4071 int rem, err = -EOPNOTSUPP; 4072 u16 flags = 0; 4073 bool have_flags = false; 4074 4075 if (nlmsg_len(nlh) < sizeof(*ifm)) 4076 return -EINVAL; 4077 4078 ifm = nlmsg_data(nlh); 4079 if (ifm->ifi_family != AF_BRIDGE) 4080 return -EPFNOSUPPORT; 4081 4082 dev = __dev_get_by_index(net, ifm->ifi_index); 4083 if (!dev) { 4084 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4085 return -ENODEV; 4086 } 4087 4088 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 4089 if (br_spec) { 4090 nla_for_each_nested(attr, br_spec, rem) { 4091 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 4092 if (nla_len(attr) < sizeof(flags)) 4093 return -EINVAL; 4094 4095 have_flags = true; 4096 flags = nla_get_u16(attr); 4097 break; 4098 } 4099 } 4100 } 4101 4102 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 4103 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4104 4105 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 4106 err = -EOPNOTSUPP; 4107 goto out; 4108 } 4109 4110 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 4111 if (err) 4112 goto out; 4113 4114 flags &= ~BRIDGE_FLAGS_MASTER; 4115 } 4116 4117 if ((flags & BRIDGE_FLAGS_SELF)) { 4118 if (!dev->netdev_ops->ndo_bridge_setlink) 4119 err = -EOPNOTSUPP; 4120 else 4121 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 4122 flags); 4123 if (!err) { 4124 flags &= ~BRIDGE_FLAGS_SELF; 4125 4126 /* Generate event to notify upper layer of bridge 4127 * change 4128 */ 4129 err = rtnl_bridge_notify(dev); 4130 } 4131 } 4132 4133 if (have_flags) 4134 memcpy(nla_data(attr), &flags, sizeof(flags)); 4135 out: 4136 return err; 4137 } 4138 4139 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 4140 struct netlink_ext_ack *extack) 4141 { 4142 struct net *net = sock_net(skb->sk); 4143 struct ifinfomsg *ifm; 4144 struct net_device *dev; 4145 struct nlattr *br_spec, *attr = NULL; 4146 int rem, err = -EOPNOTSUPP; 4147 u16 flags = 0; 4148 bool have_flags = false; 4149 4150 if (nlmsg_len(nlh) < sizeof(*ifm)) 4151 return -EINVAL; 4152 4153 ifm = nlmsg_data(nlh); 4154 if (ifm->ifi_family != AF_BRIDGE) 4155 return -EPFNOSUPPORT; 4156 4157 dev = __dev_get_by_index(net, ifm->ifi_index); 4158 if (!dev) { 4159 NL_SET_ERR_MSG(extack, "unknown ifindex"); 4160 return -ENODEV; 4161 } 4162 4163 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 4164 if (br_spec) { 4165 nla_for_each_nested(attr, br_spec, rem) { 4166 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 4167 if (nla_len(attr) < sizeof(flags)) 4168 return -EINVAL; 4169 4170 have_flags = true; 4171 flags = nla_get_u16(attr); 4172 break; 4173 } 4174 } 4175 } 4176 4177 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 4178 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 4179 4180 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 4181 err = -EOPNOTSUPP; 4182 goto out; 4183 } 4184 4185 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 4186 if (err) 4187 goto out; 4188 4189 flags &= ~BRIDGE_FLAGS_MASTER; 4190 } 4191 4192 if ((flags & BRIDGE_FLAGS_SELF)) { 4193 if (!dev->netdev_ops->ndo_bridge_dellink) 4194 err = -EOPNOTSUPP; 4195 else 4196 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 4197 flags); 4198 4199 if (!err) { 4200 flags &= ~BRIDGE_FLAGS_SELF; 4201 4202 /* Generate event to notify upper layer of bridge 4203 * change 4204 */ 4205 err = rtnl_bridge_notify(dev); 4206 } 4207 } 4208 4209 if (have_flags) 4210 memcpy(nla_data(attr), &flags, sizeof(flags)); 4211 out: 4212 return err; 4213 } 4214 4215 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr) 4216 { 4217 return (mask & IFLA_STATS_FILTER_BIT(attrid)) && 4218 (!idxattr || idxattr == attrid); 4219 } 4220 4221 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1) 4222 static int rtnl_get_offload_stats_attr_size(int attr_id) 4223 { 4224 switch (attr_id) { 4225 case IFLA_OFFLOAD_XSTATS_CPU_HIT: 4226 return sizeof(struct rtnl_link_stats64); 4227 } 4228 4229 return 0; 4230 } 4231 4232 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev, 4233 int *prividx) 4234 { 4235 struct nlattr *attr = NULL; 4236 int attr_id, size; 4237 void *attr_data; 4238 int err; 4239 4240 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 4241 dev->netdev_ops->ndo_get_offload_stats)) 4242 return -ENODATA; 4243 4244 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 4245 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 4246 if (attr_id < *prividx) 4247 continue; 4248 4249 size = rtnl_get_offload_stats_attr_size(attr_id); 4250 if (!size) 4251 continue; 4252 4253 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 4254 continue; 4255 4256 attr = nla_reserve_64bit(skb, attr_id, size, 4257 IFLA_OFFLOAD_XSTATS_UNSPEC); 4258 if (!attr) 4259 goto nla_put_failure; 4260 4261 attr_data = nla_data(attr); 4262 memset(attr_data, 0, size); 4263 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, 4264 attr_data); 4265 if (err) 4266 goto get_offload_stats_failure; 4267 } 4268 4269 if (!attr) 4270 return -ENODATA; 4271 4272 *prividx = 0; 4273 return 0; 4274 4275 nla_put_failure: 4276 err = -EMSGSIZE; 4277 get_offload_stats_failure: 4278 *prividx = attr_id; 4279 return err; 4280 } 4281 4282 static int rtnl_get_offload_stats_size(const struct net_device *dev) 4283 { 4284 int nla_size = 0; 4285 int attr_id; 4286 int size; 4287 4288 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 4289 dev->netdev_ops->ndo_get_offload_stats)) 4290 return 0; 4291 4292 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 4293 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 4294 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 4295 continue; 4296 size = rtnl_get_offload_stats_attr_size(attr_id); 4297 nla_size += nla_total_size_64bit(size); 4298 } 4299 4300 if (nla_size != 0) 4301 nla_size += nla_total_size(0); 4302 4303 return nla_size; 4304 } 4305 4306 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, 4307 int type, u32 pid, u32 seq, u32 change, 4308 unsigned int flags, unsigned int filter_mask, 4309 int *idxattr, int *prividx) 4310 { 4311 struct if_stats_msg *ifsm; 4312 struct nlmsghdr *nlh; 4313 struct nlattr *attr; 4314 int s_prividx = *prividx; 4315 int err; 4316 4317 ASSERT_RTNL(); 4318 4319 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags); 4320 if (!nlh) 4321 return -EMSGSIZE; 4322 4323 ifsm = nlmsg_data(nlh); 4324 ifsm->family = PF_UNSPEC; 4325 ifsm->pad1 = 0; 4326 ifsm->pad2 = 0; 4327 ifsm->ifindex = dev->ifindex; 4328 ifsm->filter_mask = filter_mask; 4329 4330 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) { 4331 struct rtnl_link_stats64 *sp; 4332 4333 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64, 4334 sizeof(struct rtnl_link_stats64), 4335 IFLA_STATS_UNSPEC); 4336 if (!attr) 4337 goto nla_put_failure; 4338 4339 sp = nla_data(attr); 4340 dev_get_stats(dev, sp); 4341 } 4342 4343 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) { 4344 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 4345 4346 if (ops && ops->fill_linkxstats) { 4347 *idxattr = IFLA_STATS_LINK_XSTATS; 4348 attr = nla_nest_start(skb, 4349 IFLA_STATS_LINK_XSTATS); 4350 if (!attr) 4351 goto nla_put_failure; 4352 4353 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 4354 nla_nest_end(skb, attr); 4355 if (err) 4356 goto nla_put_failure; 4357 *idxattr = 0; 4358 } 4359 } 4360 4361 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 4362 *idxattr)) { 4363 const struct rtnl_link_ops *ops = NULL; 4364 const struct net_device *master; 4365 4366 master = netdev_master_upper_dev_get(dev); 4367 if (master) 4368 ops = master->rtnl_link_ops; 4369 if (ops && ops->fill_linkxstats) { 4370 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE; 4371 attr = nla_nest_start(skb, 4372 IFLA_STATS_LINK_XSTATS_SLAVE); 4373 if (!attr) 4374 goto nla_put_failure; 4375 4376 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 4377 nla_nest_end(skb, attr); 4378 if (err) 4379 goto nla_put_failure; 4380 *idxattr = 0; 4381 } 4382 } 4383 4384 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 4385 *idxattr)) { 4386 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS; 4387 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS); 4388 if (!attr) 4389 goto nla_put_failure; 4390 4391 err = rtnl_get_offload_stats(skb, dev, prividx); 4392 if (err == -ENODATA) 4393 nla_nest_cancel(skb, attr); 4394 else 4395 nla_nest_end(skb, attr); 4396 4397 if (err && err != -ENODATA) 4398 goto nla_put_failure; 4399 *idxattr = 0; 4400 } 4401 4402 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) { 4403 struct rtnl_af_ops *af_ops; 4404 4405 *idxattr = IFLA_STATS_AF_SPEC; 4406 attr = nla_nest_start(skb, IFLA_STATS_AF_SPEC); 4407 if (!attr) 4408 goto nla_put_failure; 4409 4410 rcu_read_lock(); 4411 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 4412 if (af_ops->fill_stats_af) { 4413 struct nlattr *af; 4414 int err; 4415 4416 af = nla_nest_start(skb, af_ops->family); 4417 if (!af) { 4418 rcu_read_unlock(); 4419 goto nla_put_failure; 4420 } 4421 err = af_ops->fill_stats_af(skb, dev); 4422 4423 if (err == -ENODATA) { 4424 nla_nest_cancel(skb, af); 4425 } else if (err < 0) { 4426 rcu_read_unlock(); 4427 goto nla_put_failure; 4428 } 4429 4430 nla_nest_end(skb, af); 4431 } 4432 } 4433 rcu_read_unlock(); 4434 4435 nla_nest_end(skb, attr); 4436 4437 *idxattr = 0; 4438 } 4439 4440 nlmsg_end(skb, nlh); 4441 4442 return 0; 4443 4444 nla_put_failure: 4445 /* not a multi message or no progress mean a real error */ 4446 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx) 4447 nlmsg_cancel(skb, nlh); 4448 else 4449 nlmsg_end(skb, nlh); 4450 4451 return -EMSGSIZE; 4452 } 4453 4454 static size_t if_nlmsg_stats_size(const struct net_device *dev, 4455 u32 filter_mask) 4456 { 4457 size_t size = 0; 4458 4459 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0)) 4460 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64)); 4461 4462 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) { 4463 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 4464 int attr = IFLA_STATS_LINK_XSTATS; 4465 4466 if (ops && ops->get_linkxstats_size) { 4467 size += nla_total_size(ops->get_linkxstats_size(dev, 4468 attr)); 4469 /* for IFLA_STATS_LINK_XSTATS */ 4470 size += nla_total_size(0); 4471 } 4472 } 4473 4474 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) { 4475 struct net_device *_dev = (struct net_device *)dev; 4476 const struct rtnl_link_ops *ops = NULL; 4477 const struct net_device *master; 4478 4479 /* netdev_master_upper_dev_get can't take const */ 4480 master = netdev_master_upper_dev_get(_dev); 4481 if (master) 4482 ops = master->rtnl_link_ops; 4483 if (ops && ops->get_linkxstats_size) { 4484 int attr = IFLA_STATS_LINK_XSTATS_SLAVE; 4485 4486 size += nla_total_size(ops->get_linkxstats_size(dev, 4487 attr)); 4488 /* for IFLA_STATS_LINK_XSTATS_SLAVE */ 4489 size += nla_total_size(0); 4490 } 4491 } 4492 4493 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) 4494 size += rtnl_get_offload_stats_size(dev); 4495 4496 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) { 4497 struct rtnl_af_ops *af_ops; 4498 4499 /* for IFLA_STATS_AF_SPEC */ 4500 size += nla_total_size(0); 4501 4502 rcu_read_lock(); 4503 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { 4504 if (af_ops->get_stats_af_size) { 4505 size += nla_total_size( 4506 af_ops->get_stats_af_size(dev)); 4507 4508 /* for AF_* */ 4509 size += nla_total_size(0); 4510 } 4511 } 4512 rcu_read_unlock(); 4513 } 4514 4515 return size; 4516 } 4517 4518 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh, 4519 struct netlink_ext_ack *extack) 4520 { 4521 struct net *net = sock_net(skb->sk); 4522 struct net_device *dev = NULL; 4523 int idxattr = 0, prividx = 0; 4524 struct if_stats_msg *ifsm; 4525 struct sk_buff *nskb; 4526 u32 filter_mask; 4527 int err; 4528 4529 if (nlmsg_len(nlh) < sizeof(*ifsm)) 4530 return -EINVAL; 4531 4532 ifsm = nlmsg_data(nlh); 4533 if (ifsm->ifindex > 0) 4534 dev = __dev_get_by_index(net, ifsm->ifindex); 4535 else 4536 return -EINVAL; 4537 4538 if (!dev) 4539 return -ENODEV; 4540 4541 filter_mask = ifsm->filter_mask; 4542 if (!filter_mask) 4543 return -EINVAL; 4544 4545 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL); 4546 if (!nskb) 4547 return -ENOBUFS; 4548 4549 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS, 4550 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 4551 0, filter_mask, &idxattr, &prividx); 4552 if (err < 0) { 4553 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */ 4554 WARN_ON(err == -EMSGSIZE); 4555 kfree_skb(nskb); 4556 } else { 4557 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 4558 } 4559 4560 return err; 4561 } 4562 4563 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb) 4564 { 4565 int h, s_h, err, s_idx, s_idxattr, s_prividx; 4566 struct net *net = sock_net(skb->sk); 4567 unsigned int flags = NLM_F_MULTI; 4568 struct if_stats_msg *ifsm; 4569 struct hlist_head *head; 4570 struct net_device *dev; 4571 u32 filter_mask = 0; 4572 int idx = 0; 4573 4574 s_h = cb->args[0]; 4575 s_idx = cb->args[1]; 4576 s_idxattr = cb->args[2]; 4577 s_prividx = cb->args[3]; 4578 4579 cb->seq = net->dev_base_seq; 4580 4581 if (nlmsg_len(cb->nlh) < sizeof(*ifsm)) 4582 return -EINVAL; 4583 4584 ifsm = nlmsg_data(cb->nlh); 4585 filter_mask = ifsm->filter_mask; 4586 if (!filter_mask) 4587 return -EINVAL; 4588 4589 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4590 idx = 0; 4591 head = &net->dev_index_head[h]; 4592 hlist_for_each_entry(dev, head, index_hlist) { 4593 if (idx < s_idx) 4594 goto cont; 4595 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 4596 NETLINK_CB(cb->skb).portid, 4597 cb->nlh->nlmsg_seq, 0, 4598 flags, filter_mask, 4599 &s_idxattr, &s_prividx); 4600 /* If we ran out of room on the first message, 4601 * we're in trouble 4602 */ 4603 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 4604 4605 if (err < 0) 4606 goto out; 4607 s_prividx = 0; 4608 s_idxattr = 0; 4609 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4610 cont: 4611 idx++; 4612 } 4613 } 4614 out: 4615 cb->args[3] = s_prividx; 4616 cb->args[2] = s_idxattr; 4617 cb->args[1] = idx; 4618 cb->args[0] = h; 4619 4620 return skb->len; 4621 } 4622 4623 /* Process one rtnetlink message. */ 4624 4625 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 4626 struct netlink_ext_ack *extack) 4627 { 4628 struct net *net = sock_net(skb->sk); 4629 struct rtnl_link *link; 4630 struct module *owner; 4631 int err = -EOPNOTSUPP; 4632 rtnl_doit_func doit; 4633 unsigned int flags; 4634 int kind; 4635 int family; 4636 int type; 4637 4638 type = nlh->nlmsg_type; 4639 if (type > RTM_MAX) 4640 return -EOPNOTSUPP; 4641 4642 type -= RTM_BASE; 4643 4644 /* All the messages must have at least 1 byte length */ 4645 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 4646 return 0; 4647 4648 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 4649 kind = type&3; 4650 4651 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 4652 return -EPERM; 4653 4654 rcu_read_lock(); 4655 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 4656 struct sock *rtnl; 4657 rtnl_dumpit_func dumpit; 4658 u16 min_dump_alloc = 0; 4659 4660 link = rtnl_get_link(family, type); 4661 if (!link || !link->dumpit) { 4662 family = PF_UNSPEC; 4663 link = rtnl_get_link(family, type); 4664 if (!link || !link->dumpit) 4665 goto err_unlock; 4666 } 4667 owner = link->owner; 4668 dumpit = link->dumpit; 4669 4670 if (type == RTM_GETLINK - RTM_BASE) 4671 min_dump_alloc = rtnl_calcit(skb, nlh); 4672 4673 err = 0; 4674 /* need to do this before rcu_read_unlock() */ 4675 if (!try_module_get(owner)) 4676 err = -EPROTONOSUPPORT; 4677 4678 rcu_read_unlock(); 4679 4680 rtnl = net->rtnl; 4681 if (err == 0) { 4682 struct netlink_dump_control c = { 4683 .dump = dumpit, 4684 .min_dump_alloc = min_dump_alloc, 4685 .module = owner, 4686 }; 4687 err = netlink_dump_start(rtnl, skb, nlh, &c); 4688 /* netlink_dump_start() will keep a reference on 4689 * module if dump is still in progress. 4690 */ 4691 module_put(owner); 4692 } 4693 return err; 4694 } 4695 4696 link = rtnl_get_link(family, type); 4697 if (!link || !link->doit) { 4698 family = PF_UNSPEC; 4699 link = rtnl_get_link(PF_UNSPEC, type); 4700 if (!link || !link->doit) 4701 goto out_unlock; 4702 } 4703 4704 owner = link->owner; 4705 if (!try_module_get(owner)) { 4706 err = -EPROTONOSUPPORT; 4707 goto out_unlock; 4708 } 4709 4710 flags = link->flags; 4711 if (flags & RTNL_FLAG_DOIT_UNLOCKED) { 4712 doit = link->doit; 4713 rcu_read_unlock(); 4714 if (doit) 4715 err = doit(skb, nlh, extack); 4716 module_put(owner); 4717 return err; 4718 } 4719 rcu_read_unlock(); 4720 4721 rtnl_lock(); 4722 link = rtnl_get_link(family, type); 4723 if (link && link->doit) 4724 err = link->doit(skb, nlh, extack); 4725 rtnl_unlock(); 4726 4727 module_put(owner); 4728 4729 return err; 4730 4731 out_unlock: 4732 rcu_read_unlock(); 4733 return err; 4734 4735 err_unlock: 4736 rcu_read_unlock(); 4737 return -EOPNOTSUPP; 4738 } 4739 4740 static void rtnetlink_rcv(struct sk_buff *skb) 4741 { 4742 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 4743 } 4744 4745 static int rtnetlink_bind(struct net *net, int group) 4746 { 4747 switch (group) { 4748 case RTNLGRP_IPV4_MROUTE_R: 4749 case RTNLGRP_IPV6_MROUTE_R: 4750 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4751 return -EPERM; 4752 break; 4753 } 4754 return 0; 4755 } 4756 4757 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 4758 { 4759 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4760 4761 switch (event) { 4762 case NETDEV_REBOOT: 4763 case NETDEV_CHANGEMTU: 4764 case NETDEV_CHANGEADDR: 4765 case NETDEV_CHANGENAME: 4766 case NETDEV_FEAT_CHANGE: 4767 case NETDEV_BONDING_FAILOVER: 4768 case NETDEV_POST_TYPE_CHANGE: 4769 case NETDEV_NOTIFY_PEERS: 4770 case NETDEV_CHANGEUPPER: 4771 case NETDEV_RESEND_IGMP: 4772 case NETDEV_CHANGEINFODATA: 4773 case NETDEV_CHANGELOWERSTATE: 4774 case NETDEV_CHANGE_TX_QUEUE_LEN: 4775 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event), 4776 GFP_KERNEL, NULL, 0); 4777 break; 4778 default: 4779 break; 4780 } 4781 return NOTIFY_DONE; 4782 } 4783 4784 static struct notifier_block rtnetlink_dev_notifier = { 4785 .notifier_call = rtnetlink_event, 4786 }; 4787 4788 4789 static int __net_init rtnetlink_net_init(struct net *net) 4790 { 4791 struct sock *sk; 4792 struct netlink_kernel_cfg cfg = { 4793 .groups = RTNLGRP_MAX, 4794 .input = rtnetlink_rcv, 4795 .cb_mutex = &rtnl_mutex, 4796 .flags = NL_CFG_F_NONROOT_RECV, 4797 .bind = rtnetlink_bind, 4798 }; 4799 4800 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 4801 if (!sk) 4802 return -ENOMEM; 4803 net->rtnl = sk; 4804 return 0; 4805 } 4806 4807 static void __net_exit rtnetlink_net_exit(struct net *net) 4808 { 4809 netlink_kernel_release(net->rtnl); 4810 net->rtnl = NULL; 4811 } 4812 4813 static struct pernet_operations rtnetlink_net_ops = { 4814 .init = rtnetlink_net_init, 4815 .exit = rtnetlink_net_exit, 4816 }; 4817 4818 void __init rtnetlink_init(void) 4819 { 4820 if (register_pernet_subsys(&rtnetlink_net_ops)) 4821 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 4822 4823 register_netdevice_notifier(&rtnetlink_dev_notifier); 4824 4825 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 4826 rtnl_dump_ifinfo, 0); 4827 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0); 4828 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0); 4829 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0); 4830 4831 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0); 4832 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0); 4833 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0); 4834 4835 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0); 4836 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0); 4837 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, 0); 4838 4839 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0); 4840 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0); 4841 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0); 4842 4843 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump, 4844 0); 4845 } 4846