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