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