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