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