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