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