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