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