1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/slab.h> 31 #include <linux/interrupt.h> 32 #include <linux/capability.h> 33 #include <linux/skbuff.h> 34 #include <linux/init.h> 35 #include <linux/security.h> 36 #include <linux/mutex.h> 37 #include <linux/if_addr.h> 38 #include <linux/if_bridge.h> 39 #include <linux/if_vlan.h> 40 #include <linux/pci.h> 41 #include <linux/etherdevice.h> 42 43 #include <asm/uaccess.h> 44 45 #include <linux/inet.h> 46 #include <linux/netdevice.h> 47 #include <net/switchdev.h> 48 #include <net/ip.h> 49 #include <net/protocol.h> 50 #include <net/arp.h> 51 #include <net/route.h> 52 #include <net/udp.h> 53 #include <net/tcp.h> 54 #include <net/sock.h> 55 #include <net/pkt_sched.h> 56 #include <net/fib_rules.h> 57 #include <net/rtnetlink.h> 58 #include <net/net_namespace.h> 59 60 struct rtnl_link { 61 rtnl_doit_func doit; 62 rtnl_dumpit_func dumpit; 63 rtnl_calcit_func calcit; 64 }; 65 66 static DEFINE_MUTEX(rtnl_mutex); 67 68 void rtnl_lock(void) 69 { 70 mutex_lock(&rtnl_mutex); 71 } 72 EXPORT_SYMBOL(rtnl_lock); 73 74 static struct sk_buff *defer_kfree_skb_list; 75 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail) 76 { 77 if (head && tail) { 78 tail->next = defer_kfree_skb_list; 79 defer_kfree_skb_list = head; 80 } 81 } 82 EXPORT_SYMBOL(rtnl_kfree_skbs); 83 84 void __rtnl_unlock(void) 85 { 86 struct sk_buff *head = defer_kfree_skb_list; 87 88 defer_kfree_skb_list = NULL; 89 90 mutex_unlock(&rtnl_mutex); 91 92 while (head) { 93 struct sk_buff *next = head->next; 94 95 kfree_skb(head); 96 cond_resched(); 97 head = next; 98 } 99 } 100 101 void rtnl_unlock(void) 102 { 103 /* This fellow will unlock it for us. */ 104 netdev_run_todo(); 105 } 106 EXPORT_SYMBOL(rtnl_unlock); 107 108 int rtnl_trylock(void) 109 { 110 return mutex_trylock(&rtnl_mutex); 111 } 112 EXPORT_SYMBOL(rtnl_trylock); 113 114 int rtnl_is_locked(void) 115 { 116 return mutex_is_locked(&rtnl_mutex); 117 } 118 EXPORT_SYMBOL(rtnl_is_locked); 119 120 #ifdef CONFIG_PROVE_LOCKING 121 bool lockdep_rtnl_is_held(void) 122 { 123 return lockdep_is_held(&rtnl_mutex); 124 } 125 EXPORT_SYMBOL(lockdep_rtnl_is_held); 126 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 127 128 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 129 130 static inline int rtm_msgindex(int msgtype) 131 { 132 int msgindex = msgtype - RTM_BASE; 133 134 /* 135 * msgindex < 0 implies someone tried to register a netlink 136 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 137 * the message type has not been added to linux/rtnetlink.h 138 */ 139 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 140 141 return msgindex; 142 } 143 144 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 145 { 146 struct rtnl_link *tab; 147 148 if (protocol <= RTNL_FAMILY_MAX) 149 tab = rtnl_msg_handlers[protocol]; 150 else 151 tab = NULL; 152 153 if (tab == NULL || tab[msgindex].doit == NULL) 154 tab = rtnl_msg_handlers[PF_UNSPEC]; 155 156 return tab[msgindex].doit; 157 } 158 159 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 160 { 161 struct rtnl_link *tab; 162 163 if (protocol <= RTNL_FAMILY_MAX) 164 tab = rtnl_msg_handlers[protocol]; 165 else 166 tab = NULL; 167 168 if (tab == NULL || tab[msgindex].dumpit == NULL) 169 tab = rtnl_msg_handlers[PF_UNSPEC]; 170 171 return tab[msgindex].dumpit; 172 } 173 174 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 175 { 176 struct rtnl_link *tab; 177 178 if (protocol <= RTNL_FAMILY_MAX) 179 tab = rtnl_msg_handlers[protocol]; 180 else 181 tab = NULL; 182 183 if (tab == NULL || tab[msgindex].calcit == NULL) 184 tab = rtnl_msg_handlers[PF_UNSPEC]; 185 186 return tab[msgindex].calcit; 187 } 188 189 /** 190 * __rtnl_register - Register a rtnetlink message type 191 * @protocol: Protocol family or PF_UNSPEC 192 * @msgtype: rtnetlink message type 193 * @doit: Function pointer called for each request message 194 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 195 * @calcit: Function pointer to calc size of dump message 196 * 197 * Registers the specified function pointers (at least one of them has 198 * to be non-NULL) to be called whenever a request message for the 199 * specified protocol family and message type is received. 200 * 201 * The special protocol family PF_UNSPEC may be used to define fallback 202 * function pointers for the case when no entry for the specific protocol 203 * family exists. 204 * 205 * Returns 0 on success or a negative error code. 206 */ 207 int __rtnl_register(int protocol, int msgtype, 208 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 209 rtnl_calcit_func calcit) 210 { 211 struct rtnl_link *tab; 212 int msgindex; 213 214 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 215 msgindex = rtm_msgindex(msgtype); 216 217 tab = rtnl_msg_handlers[protocol]; 218 if (tab == NULL) { 219 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 220 if (tab == NULL) 221 return -ENOBUFS; 222 223 rtnl_msg_handlers[protocol] = tab; 224 } 225 226 if (doit) 227 tab[msgindex].doit = doit; 228 229 if (dumpit) 230 tab[msgindex].dumpit = dumpit; 231 232 if (calcit) 233 tab[msgindex].calcit = calcit; 234 235 return 0; 236 } 237 EXPORT_SYMBOL_GPL(__rtnl_register); 238 239 /** 240 * rtnl_register - Register a rtnetlink message type 241 * 242 * Identical to __rtnl_register() but panics on failure. This is useful 243 * as failure of this function is very unlikely, it can only happen due 244 * to lack of memory when allocating the chain to store all message 245 * handlers for a protocol. Meant for use in init functions where lack 246 * of memory implies no sense in continuing. 247 */ 248 void rtnl_register(int protocol, int msgtype, 249 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 250 rtnl_calcit_func calcit) 251 { 252 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 253 panic("Unable to register rtnetlink message handler, " 254 "protocol = %d, message type = %d\n", 255 protocol, msgtype); 256 } 257 EXPORT_SYMBOL_GPL(rtnl_register); 258 259 /** 260 * rtnl_unregister - Unregister a rtnetlink message type 261 * @protocol: Protocol family or PF_UNSPEC 262 * @msgtype: rtnetlink message type 263 * 264 * Returns 0 on success or a negative error code. 265 */ 266 int rtnl_unregister(int protocol, int msgtype) 267 { 268 int msgindex; 269 270 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 271 msgindex = rtm_msgindex(msgtype); 272 273 if (rtnl_msg_handlers[protocol] == NULL) 274 return -ENOENT; 275 276 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 277 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 278 rtnl_msg_handlers[protocol][msgindex].calcit = NULL; 279 280 return 0; 281 } 282 EXPORT_SYMBOL_GPL(rtnl_unregister); 283 284 /** 285 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 286 * @protocol : Protocol family or PF_UNSPEC 287 * 288 * Identical to calling rtnl_unregster() for all registered message types 289 * of a certain protocol family. 290 */ 291 void rtnl_unregister_all(int protocol) 292 { 293 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 294 295 kfree(rtnl_msg_handlers[protocol]); 296 rtnl_msg_handlers[protocol] = NULL; 297 } 298 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 299 300 static LIST_HEAD(link_ops); 301 302 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 303 { 304 const struct rtnl_link_ops *ops; 305 306 list_for_each_entry(ops, &link_ops, list) { 307 if (!strcmp(ops->kind, kind)) 308 return ops; 309 } 310 return NULL; 311 } 312 313 /** 314 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 315 * @ops: struct rtnl_link_ops * to register 316 * 317 * The caller must hold the rtnl_mutex. This function should be used 318 * by drivers that create devices during module initialization. It 319 * must be called before registering the devices. 320 * 321 * Returns 0 on success or a negative error code. 322 */ 323 int __rtnl_link_register(struct rtnl_link_ops *ops) 324 { 325 if (rtnl_link_ops_get(ops->kind)) 326 return -EEXIST; 327 328 /* The check for setup is here because if ops 329 * does not have that filled up, it is not possible 330 * to use the ops for creating device. So do not 331 * fill up dellink as well. That disables rtnl_dellink. 332 */ 333 if (ops->setup && !ops->dellink) 334 ops->dellink = unregister_netdevice_queue; 335 336 list_add_tail(&ops->list, &link_ops); 337 return 0; 338 } 339 EXPORT_SYMBOL_GPL(__rtnl_link_register); 340 341 /** 342 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 343 * @ops: struct rtnl_link_ops * to register 344 * 345 * Returns 0 on success or a negative error code. 346 */ 347 int rtnl_link_register(struct rtnl_link_ops *ops) 348 { 349 int err; 350 351 rtnl_lock(); 352 err = __rtnl_link_register(ops); 353 rtnl_unlock(); 354 return err; 355 } 356 EXPORT_SYMBOL_GPL(rtnl_link_register); 357 358 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 359 { 360 struct net_device *dev; 361 LIST_HEAD(list_kill); 362 363 for_each_netdev(net, dev) { 364 if (dev->rtnl_link_ops == ops) 365 ops->dellink(dev, &list_kill); 366 } 367 unregister_netdevice_many(&list_kill); 368 } 369 370 /** 371 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 372 * @ops: struct rtnl_link_ops * to unregister 373 * 374 * The caller must hold the rtnl_mutex. 375 */ 376 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 377 { 378 struct net *net; 379 380 for_each_net(net) { 381 __rtnl_kill_links(net, ops); 382 } 383 list_del(&ops->list); 384 } 385 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 386 387 /* Return with the rtnl_lock held when there are no network 388 * devices unregistering in any network namespace. 389 */ 390 static void rtnl_lock_unregistering_all(void) 391 { 392 struct net *net; 393 bool unregistering; 394 DEFINE_WAIT_FUNC(wait, woken_wake_function); 395 396 add_wait_queue(&netdev_unregistering_wq, &wait); 397 for (;;) { 398 unregistering = false; 399 rtnl_lock(); 400 for_each_net(net) { 401 if (net->dev_unreg_count > 0) { 402 unregistering = true; 403 break; 404 } 405 } 406 if (!unregistering) 407 break; 408 __rtnl_unlock(); 409 410 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 411 } 412 remove_wait_queue(&netdev_unregistering_wq, &wait); 413 } 414 415 /** 416 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 417 * @ops: struct rtnl_link_ops * to unregister 418 */ 419 void rtnl_link_unregister(struct rtnl_link_ops *ops) 420 { 421 /* Close the race with cleanup_net() */ 422 mutex_lock(&net_mutex); 423 rtnl_lock_unregistering_all(); 424 __rtnl_link_unregister(ops); 425 rtnl_unlock(); 426 mutex_unlock(&net_mutex); 427 } 428 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 429 430 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 431 { 432 struct net_device *master_dev; 433 const struct rtnl_link_ops *ops; 434 435 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 436 if (!master_dev) 437 return 0; 438 ops = master_dev->rtnl_link_ops; 439 if (!ops || !ops->get_slave_size) 440 return 0; 441 /* IFLA_INFO_SLAVE_DATA + nested data */ 442 return nla_total_size(sizeof(struct nlattr)) + 443 ops->get_slave_size(master_dev, dev); 444 } 445 446 static size_t rtnl_link_get_size(const struct net_device *dev) 447 { 448 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 449 size_t size; 450 451 if (!ops) 452 return 0; 453 454 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 455 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 456 457 if (ops->get_size) 458 /* IFLA_INFO_DATA + nested data */ 459 size += nla_total_size(sizeof(struct nlattr)) + 460 ops->get_size(dev); 461 462 if (ops->get_xstats_size) 463 /* IFLA_INFO_XSTATS */ 464 size += nla_total_size(ops->get_xstats_size(dev)); 465 466 size += rtnl_link_get_slave_info_data_size(dev); 467 468 return size; 469 } 470 471 static LIST_HEAD(rtnl_af_ops); 472 473 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 474 { 475 const struct rtnl_af_ops *ops; 476 477 list_for_each_entry(ops, &rtnl_af_ops, list) { 478 if (ops->family == family) 479 return ops; 480 } 481 482 return NULL; 483 } 484 485 /** 486 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 487 * @ops: struct rtnl_af_ops * to register 488 * 489 * Returns 0 on success or a negative error code. 490 */ 491 void rtnl_af_register(struct rtnl_af_ops *ops) 492 { 493 rtnl_lock(); 494 list_add_tail(&ops->list, &rtnl_af_ops); 495 rtnl_unlock(); 496 } 497 EXPORT_SYMBOL_GPL(rtnl_af_register); 498 499 /** 500 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 501 * @ops: struct rtnl_af_ops * to unregister 502 * 503 * The caller must hold the rtnl_mutex. 504 */ 505 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 506 { 507 list_del(&ops->list); 508 } 509 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 510 511 /** 512 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 513 * @ops: struct rtnl_af_ops * to unregister 514 */ 515 void rtnl_af_unregister(struct rtnl_af_ops *ops) 516 { 517 rtnl_lock(); 518 __rtnl_af_unregister(ops); 519 rtnl_unlock(); 520 } 521 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 522 523 static size_t rtnl_link_get_af_size(const struct net_device *dev, 524 u32 ext_filter_mask) 525 { 526 struct rtnl_af_ops *af_ops; 527 size_t size; 528 529 /* IFLA_AF_SPEC */ 530 size = nla_total_size(sizeof(struct nlattr)); 531 532 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 533 if (af_ops->get_link_af_size) { 534 /* AF_* + nested data */ 535 size += nla_total_size(sizeof(struct nlattr)) + 536 af_ops->get_link_af_size(dev, ext_filter_mask); 537 } 538 } 539 540 return size; 541 } 542 543 static bool rtnl_have_link_slave_info(const struct net_device *dev) 544 { 545 struct net_device *master_dev; 546 547 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 548 if (master_dev && master_dev->rtnl_link_ops) 549 return true; 550 return false; 551 } 552 553 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 554 const struct net_device *dev) 555 { 556 struct net_device *master_dev; 557 const struct rtnl_link_ops *ops; 558 struct nlattr *slave_data; 559 int err; 560 561 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 562 if (!master_dev) 563 return 0; 564 ops = master_dev->rtnl_link_ops; 565 if (!ops) 566 return 0; 567 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 568 return -EMSGSIZE; 569 if (ops->fill_slave_info) { 570 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA); 571 if (!slave_data) 572 return -EMSGSIZE; 573 err = ops->fill_slave_info(skb, master_dev, dev); 574 if (err < 0) 575 goto err_cancel_slave_data; 576 nla_nest_end(skb, slave_data); 577 } 578 return 0; 579 580 err_cancel_slave_data: 581 nla_nest_cancel(skb, slave_data); 582 return err; 583 } 584 585 static int rtnl_link_info_fill(struct sk_buff *skb, 586 const struct net_device *dev) 587 { 588 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 589 struct nlattr *data; 590 int err; 591 592 if (!ops) 593 return 0; 594 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 595 return -EMSGSIZE; 596 if (ops->fill_xstats) { 597 err = ops->fill_xstats(skb, dev); 598 if (err < 0) 599 return err; 600 } 601 if (ops->fill_info) { 602 data = nla_nest_start(skb, IFLA_INFO_DATA); 603 if (data == NULL) 604 return -EMSGSIZE; 605 err = ops->fill_info(skb, dev); 606 if (err < 0) 607 goto err_cancel_data; 608 nla_nest_end(skb, data); 609 } 610 return 0; 611 612 err_cancel_data: 613 nla_nest_cancel(skb, data); 614 return err; 615 } 616 617 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 618 { 619 struct nlattr *linkinfo; 620 int err = -EMSGSIZE; 621 622 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 623 if (linkinfo == NULL) 624 goto out; 625 626 err = rtnl_link_info_fill(skb, dev); 627 if (err < 0) 628 goto err_cancel_link; 629 630 err = rtnl_link_slave_info_fill(skb, dev); 631 if (err < 0) 632 goto err_cancel_link; 633 634 nla_nest_end(skb, linkinfo); 635 return 0; 636 637 err_cancel_link: 638 nla_nest_cancel(skb, linkinfo); 639 out: 640 return err; 641 } 642 643 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 644 { 645 struct sock *rtnl = net->rtnl; 646 int err = 0; 647 648 NETLINK_CB(skb).dst_group = group; 649 if (echo) 650 atomic_inc(&skb->users); 651 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 652 if (echo) 653 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 654 return err; 655 } 656 657 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 658 { 659 struct sock *rtnl = net->rtnl; 660 661 return nlmsg_unicast(rtnl, skb, pid); 662 } 663 EXPORT_SYMBOL(rtnl_unicast); 664 665 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 666 struct nlmsghdr *nlh, gfp_t flags) 667 { 668 struct sock *rtnl = net->rtnl; 669 int report = 0; 670 671 if (nlh) 672 report = nlmsg_report(nlh); 673 674 nlmsg_notify(rtnl, skb, pid, group, report, flags); 675 } 676 EXPORT_SYMBOL(rtnl_notify); 677 678 void rtnl_set_sk_err(struct net *net, u32 group, int error) 679 { 680 struct sock *rtnl = net->rtnl; 681 682 netlink_set_err(rtnl, 0, group, error); 683 } 684 EXPORT_SYMBOL(rtnl_set_sk_err); 685 686 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 687 { 688 struct nlattr *mx; 689 int i, valid = 0; 690 691 mx = nla_nest_start(skb, RTA_METRICS); 692 if (mx == NULL) 693 return -ENOBUFS; 694 695 for (i = 0; i < RTAX_MAX; i++) { 696 if (metrics[i]) { 697 if (i == RTAX_CC_ALGO - 1) { 698 char tmp[TCP_CA_NAME_MAX], *name; 699 700 name = tcp_ca_get_name_by_key(metrics[i], tmp); 701 if (!name) 702 continue; 703 if (nla_put_string(skb, i + 1, name)) 704 goto nla_put_failure; 705 } else if (i == RTAX_FEATURES - 1) { 706 u32 user_features = metrics[i] & RTAX_FEATURE_MASK; 707 708 if (!user_features) 709 continue; 710 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); 711 if (nla_put_u32(skb, i + 1, user_features)) 712 goto nla_put_failure; 713 } else { 714 if (nla_put_u32(skb, i + 1, metrics[i])) 715 goto nla_put_failure; 716 } 717 valid++; 718 } 719 } 720 721 if (!valid) { 722 nla_nest_cancel(skb, mx); 723 return 0; 724 } 725 726 return nla_nest_end(skb, mx); 727 728 nla_put_failure: 729 nla_nest_cancel(skb, mx); 730 return -EMSGSIZE; 731 } 732 EXPORT_SYMBOL(rtnetlink_put_metrics); 733 734 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 735 long expires, u32 error) 736 { 737 struct rta_cacheinfo ci = { 738 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 739 .rta_used = dst->__use, 740 .rta_clntref = atomic_read(&(dst->__refcnt)), 741 .rta_error = error, 742 .rta_id = id, 743 }; 744 745 if (expires) { 746 unsigned long clock; 747 748 clock = jiffies_to_clock_t(abs(expires)); 749 clock = min_t(unsigned long, clock, INT_MAX); 750 ci.rta_expires = (expires > 0) ? clock : -clock; 751 } 752 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 753 } 754 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 755 756 static void set_operstate(struct net_device *dev, unsigned char transition) 757 { 758 unsigned char operstate = dev->operstate; 759 760 switch (transition) { 761 case IF_OPER_UP: 762 if ((operstate == IF_OPER_DORMANT || 763 operstate == IF_OPER_UNKNOWN) && 764 !netif_dormant(dev)) 765 operstate = IF_OPER_UP; 766 break; 767 768 case IF_OPER_DORMANT: 769 if (operstate == IF_OPER_UP || 770 operstate == IF_OPER_UNKNOWN) 771 operstate = IF_OPER_DORMANT; 772 break; 773 } 774 775 if (dev->operstate != operstate) { 776 write_lock_bh(&dev_base_lock); 777 dev->operstate = operstate; 778 write_unlock_bh(&dev_base_lock); 779 netdev_state_change(dev); 780 } 781 } 782 783 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 784 { 785 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 786 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 787 } 788 789 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 790 const struct ifinfomsg *ifm) 791 { 792 unsigned int flags = ifm->ifi_flags; 793 794 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 795 if (ifm->ifi_change) 796 flags = (flags & ifm->ifi_change) | 797 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 798 799 return flags; 800 } 801 802 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 803 const struct rtnl_link_stats64 *b) 804 { 805 a->rx_packets = b->rx_packets; 806 a->tx_packets = b->tx_packets; 807 a->rx_bytes = b->rx_bytes; 808 a->tx_bytes = b->tx_bytes; 809 a->rx_errors = b->rx_errors; 810 a->tx_errors = b->tx_errors; 811 a->rx_dropped = b->rx_dropped; 812 a->tx_dropped = b->tx_dropped; 813 814 a->multicast = b->multicast; 815 a->collisions = b->collisions; 816 817 a->rx_length_errors = b->rx_length_errors; 818 a->rx_over_errors = b->rx_over_errors; 819 a->rx_crc_errors = b->rx_crc_errors; 820 a->rx_frame_errors = b->rx_frame_errors; 821 a->rx_fifo_errors = b->rx_fifo_errors; 822 a->rx_missed_errors = b->rx_missed_errors; 823 824 a->tx_aborted_errors = b->tx_aborted_errors; 825 a->tx_carrier_errors = b->tx_carrier_errors; 826 a->tx_fifo_errors = b->tx_fifo_errors; 827 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 828 a->tx_window_errors = b->tx_window_errors; 829 830 a->rx_compressed = b->rx_compressed; 831 a->tx_compressed = b->tx_compressed; 832 833 a->rx_nohandler = b->rx_nohandler; 834 } 835 836 /* All VF info */ 837 static inline int rtnl_vfinfo_size(const struct net_device *dev, 838 u32 ext_filter_mask) 839 { 840 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 841 (ext_filter_mask & RTEXT_FILTER_VF)) { 842 int num_vfs = dev_num_vf(dev->dev.parent); 843 size_t size = nla_total_size(0); 844 size += num_vfs * 845 (nla_total_size(0) + 846 nla_total_size(sizeof(struct ifla_vf_mac)) + 847 nla_total_size(sizeof(struct ifla_vf_vlan)) + 848 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */ 849 nla_total_size(MAX_VLAN_LIST_LEN * 850 sizeof(struct ifla_vf_vlan_info)) + 851 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 852 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 853 nla_total_size(sizeof(struct ifla_vf_rate)) + 854 nla_total_size(sizeof(struct ifla_vf_link_state)) + 855 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 856 nla_total_size(0) + /* nest IFLA_VF_STATS */ 857 /* IFLA_VF_STATS_RX_PACKETS */ 858 nla_total_size_64bit(sizeof(__u64)) + 859 /* IFLA_VF_STATS_TX_PACKETS */ 860 nla_total_size_64bit(sizeof(__u64)) + 861 /* IFLA_VF_STATS_RX_BYTES */ 862 nla_total_size_64bit(sizeof(__u64)) + 863 /* IFLA_VF_STATS_TX_BYTES */ 864 nla_total_size_64bit(sizeof(__u64)) + 865 /* IFLA_VF_STATS_BROADCAST */ 866 nla_total_size_64bit(sizeof(__u64)) + 867 /* IFLA_VF_STATS_MULTICAST */ 868 nla_total_size_64bit(sizeof(__u64)) + 869 nla_total_size(sizeof(struct ifla_vf_trust))); 870 return size; 871 } else 872 return 0; 873 } 874 875 static size_t rtnl_port_size(const struct net_device *dev, 876 u32 ext_filter_mask) 877 { 878 size_t port_size = nla_total_size(4) /* PORT_VF */ 879 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 880 + nla_total_size(sizeof(struct ifla_port_vsi)) 881 /* PORT_VSI_TYPE */ 882 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 883 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 884 + nla_total_size(1) /* PROT_VDP_REQUEST */ 885 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 886 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 887 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 888 + port_size; 889 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 890 + port_size; 891 892 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 893 !(ext_filter_mask & RTEXT_FILTER_VF)) 894 return 0; 895 if (dev_num_vf(dev->dev.parent)) 896 return port_self_size + vf_ports_size + 897 vf_port_size * dev_num_vf(dev->dev.parent); 898 else 899 return port_self_size; 900 } 901 902 static size_t rtnl_xdp_size(const struct net_device *dev) 903 { 904 size_t xdp_size = nla_total_size(1); /* XDP_ATTACHED */ 905 906 if (!dev->netdev_ops->ndo_xdp) 907 return 0; 908 else 909 return xdp_size; 910 } 911 912 static noinline size_t if_nlmsg_size(const struct net_device *dev, 913 u32 ext_filter_mask) 914 { 915 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 916 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 917 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 918 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 919 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap)) 920 + nla_total_size(sizeof(struct rtnl_link_stats)) 921 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64)) 922 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 923 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 924 + nla_total_size(4) /* IFLA_TXQLEN */ 925 + nla_total_size(4) /* IFLA_WEIGHT */ 926 + nla_total_size(4) /* IFLA_MTU */ 927 + nla_total_size(4) /* IFLA_LINK */ 928 + nla_total_size(4) /* IFLA_MASTER */ 929 + nla_total_size(1) /* IFLA_CARRIER */ 930 + nla_total_size(4) /* IFLA_PROMISCUITY */ 931 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 932 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 933 + nla_total_size(4) /* IFLA_MAX_GSO_SEGS */ 934 + nla_total_size(4) /* IFLA_MAX_GSO_SIZE */ 935 + nla_total_size(1) /* IFLA_OPERSTATE */ 936 + nla_total_size(1) /* IFLA_LINKMODE */ 937 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 938 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 939 + nla_total_size(ext_filter_mask 940 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 941 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 942 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 943 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 944 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 945 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 946 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 947 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */ 948 + rtnl_xdp_size(dev) /* IFLA_XDP */ 949 + nla_total_size(1); /* IFLA_PROTO_DOWN */ 950 951 } 952 953 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 954 { 955 struct nlattr *vf_ports; 956 struct nlattr *vf_port; 957 int vf; 958 int err; 959 960 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 961 if (!vf_ports) 962 return -EMSGSIZE; 963 964 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 965 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 966 if (!vf_port) 967 goto nla_put_failure; 968 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 969 goto nla_put_failure; 970 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 971 if (err == -EMSGSIZE) 972 goto nla_put_failure; 973 if (err) { 974 nla_nest_cancel(skb, vf_port); 975 continue; 976 } 977 nla_nest_end(skb, vf_port); 978 } 979 980 nla_nest_end(skb, vf_ports); 981 982 return 0; 983 984 nla_put_failure: 985 nla_nest_cancel(skb, vf_ports); 986 return -EMSGSIZE; 987 } 988 989 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 990 { 991 struct nlattr *port_self; 992 int err; 993 994 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 995 if (!port_self) 996 return -EMSGSIZE; 997 998 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 999 if (err) { 1000 nla_nest_cancel(skb, port_self); 1001 return (err == -EMSGSIZE) ? err : 0; 1002 } 1003 1004 nla_nest_end(skb, port_self); 1005 1006 return 0; 1007 } 1008 1009 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 1010 u32 ext_filter_mask) 1011 { 1012 int err; 1013 1014 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 1015 !(ext_filter_mask & RTEXT_FILTER_VF)) 1016 return 0; 1017 1018 err = rtnl_port_self_fill(skb, dev); 1019 if (err) 1020 return err; 1021 1022 if (dev_num_vf(dev->dev.parent)) { 1023 err = rtnl_vf_ports_fill(skb, dev); 1024 if (err) 1025 return err; 1026 } 1027 1028 return 0; 1029 } 1030 1031 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 1032 { 1033 int err; 1034 struct netdev_phys_item_id ppid; 1035 1036 err = dev_get_phys_port_id(dev, &ppid); 1037 if (err) { 1038 if (err == -EOPNOTSUPP) 1039 return 0; 1040 return err; 1041 } 1042 1043 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1044 return -EMSGSIZE; 1045 1046 return 0; 1047 } 1048 1049 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1050 { 1051 char name[IFNAMSIZ]; 1052 int err; 1053 1054 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1055 if (err) { 1056 if (err == -EOPNOTSUPP) 1057 return 0; 1058 return err; 1059 } 1060 1061 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 1062 return -EMSGSIZE; 1063 1064 return 0; 1065 } 1066 1067 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1068 { 1069 int err; 1070 struct switchdev_attr attr = { 1071 .orig_dev = dev, 1072 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 1073 .flags = SWITCHDEV_F_NO_RECURSE, 1074 }; 1075 1076 err = switchdev_port_attr_get(dev, &attr); 1077 if (err) { 1078 if (err == -EOPNOTSUPP) 1079 return 0; 1080 return err; 1081 } 1082 1083 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1084 attr.u.ppid.id)) 1085 return -EMSGSIZE; 1086 1087 return 0; 1088 } 1089 1090 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1091 struct net_device *dev) 1092 { 1093 struct rtnl_link_stats64 *sp; 1094 struct nlattr *attr; 1095 1096 attr = nla_reserve_64bit(skb, IFLA_STATS64, 1097 sizeof(struct rtnl_link_stats64), IFLA_PAD); 1098 if (!attr) 1099 return -EMSGSIZE; 1100 1101 sp = nla_data(attr); 1102 dev_get_stats(dev, sp); 1103 1104 attr = nla_reserve(skb, IFLA_STATS, 1105 sizeof(struct rtnl_link_stats)); 1106 if (!attr) 1107 return -EMSGSIZE; 1108 1109 copy_rtnl_link_stats(nla_data(attr), sp); 1110 1111 return 0; 1112 } 1113 1114 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1115 struct net_device *dev, 1116 int vfs_num, 1117 struct nlattr *vfinfo) 1118 { 1119 struct ifla_vf_rss_query_en vf_rss_query_en; 1120 struct nlattr *vf, *vfstats, *vfvlanlist; 1121 struct ifla_vf_link_state vf_linkstate; 1122 struct ifla_vf_vlan_info vf_vlan_info; 1123 struct ifla_vf_spoofchk vf_spoofchk; 1124 struct ifla_vf_tx_rate vf_tx_rate; 1125 struct ifla_vf_stats vf_stats; 1126 struct ifla_vf_trust vf_trust; 1127 struct ifla_vf_vlan vf_vlan; 1128 struct ifla_vf_rate vf_rate; 1129 struct ifla_vf_mac vf_mac; 1130 struct ifla_vf_info ivi; 1131 1132 /* Not all SR-IOV capable drivers support the 1133 * spoofcheck and "RSS query enable" query. Preset to 1134 * -1 so the user space tool can detect that the driver 1135 * didn't report anything. 1136 */ 1137 ivi.spoofchk = -1; 1138 ivi.rss_query_en = -1; 1139 ivi.trusted = -1; 1140 memset(ivi.mac, 0, sizeof(ivi.mac)); 1141 /* The default value for VF link state is "auto" 1142 * IFLA_VF_LINK_STATE_AUTO which equals zero 1143 */ 1144 ivi.linkstate = 0; 1145 /* VLAN Protocol by default is 802.1Q */ 1146 ivi.vlan_proto = htons(ETH_P_8021Q); 1147 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1148 return 0; 1149 1150 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info)); 1151 1152 vf_mac.vf = 1153 vf_vlan.vf = 1154 vf_vlan_info.vf = 1155 vf_rate.vf = 1156 vf_tx_rate.vf = 1157 vf_spoofchk.vf = 1158 vf_linkstate.vf = 1159 vf_rss_query_en.vf = 1160 vf_trust.vf = ivi.vf; 1161 1162 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1163 vf_vlan.vlan = ivi.vlan; 1164 vf_vlan.qos = ivi.qos; 1165 vf_vlan_info.vlan = ivi.vlan; 1166 vf_vlan_info.qos = ivi.qos; 1167 vf_vlan_info.vlan_proto = ivi.vlan_proto; 1168 vf_tx_rate.rate = ivi.max_tx_rate; 1169 vf_rate.min_tx_rate = ivi.min_tx_rate; 1170 vf_rate.max_tx_rate = ivi.max_tx_rate; 1171 vf_spoofchk.setting = ivi.spoofchk; 1172 vf_linkstate.link_state = ivi.linkstate; 1173 vf_rss_query_en.setting = ivi.rss_query_en; 1174 vf_trust.setting = ivi.trusted; 1175 vf = nla_nest_start(skb, IFLA_VF_INFO); 1176 if (!vf) 1177 goto nla_put_vfinfo_failure; 1178 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1179 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1180 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1181 &vf_rate) || 1182 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1183 &vf_tx_rate) || 1184 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1185 &vf_spoofchk) || 1186 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1187 &vf_linkstate) || 1188 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1189 sizeof(vf_rss_query_en), 1190 &vf_rss_query_en) || 1191 nla_put(skb, IFLA_VF_TRUST, 1192 sizeof(vf_trust), &vf_trust)) 1193 goto nla_put_vf_failure; 1194 vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST); 1195 if (!vfvlanlist) 1196 goto nla_put_vf_failure; 1197 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info), 1198 &vf_vlan_info)) { 1199 nla_nest_cancel(skb, vfvlanlist); 1200 goto nla_put_vf_failure; 1201 } 1202 nla_nest_end(skb, vfvlanlist); 1203 memset(&vf_stats, 0, sizeof(vf_stats)); 1204 if (dev->netdev_ops->ndo_get_vf_stats) 1205 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1206 &vf_stats); 1207 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1208 if (!vfstats) 1209 goto nla_put_vf_failure; 1210 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS, 1211 vf_stats.rx_packets, IFLA_VF_STATS_PAD) || 1212 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS, 1213 vf_stats.tx_packets, IFLA_VF_STATS_PAD) || 1214 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES, 1215 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) || 1216 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES, 1217 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) || 1218 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST, 1219 vf_stats.broadcast, IFLA_VF_STATS_PAD) || 1220 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST, 1221 vf_stats.multicast, IFLA_VF_STATS_PAD)) { 1222 nla_nest_cancel(skb, vfstats); 1223 goto nla_put_vf_failure; 1224 } 1225 nla_nest_end(skb, vfstats); 1226 nla_nest_end(skb, vf); 1227 return 0; 1228 1229 nla_put_vf_failure: 1230 nla_nest_cancel(skb, vf); 1231 nla_put_vfinfo_failure: 1232 nla_nest_cancel(skb, vfinfo); 1233 return -EMSGSIZE; 1234 } 1235 1236 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1237 { 1238 struct rtnl_link_ifmap map; 1239 1240 memset(&map, 0, sizeof(map)); 1241 map.mem_start = dev->mem_start; 1242 map.mem_end = dev->mem_end; 1243 map.base_addr = dev->base_addr; 1244 map.irq = dev->irq; 1245 map.dma = dev->dma; 1246 map.port = dev->if_port; 1247 1248 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD)) 1249 return -EMSGSIZE; 1250 1251 return 0; 1252 } 1253 1254 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev) 1255 { 1256 struct netdev_xdp xdp_op = {}; 1257 struct nlattr *xdp; 1258 int err; 1259 1260 if (!dev->netdev_ops->ndo_xdp) 1261 return 0; 1262 xdp = nla_nest_start(skb, IFLA_XDP); 1263 if (!xdp) 1264 return -EMSGSIZE; 1265 xdp_op.command = XDP_QUERY_PROG; 1266 err = dev->netdev_ops->ndo_xdp(dev, &xdp_op); 1267 if (err) 1268 goto err_cancel; 1269 err = nla_put_u8(skb, IFLA_XDP_ATTACHED, xdp_op.prog_attached); 1270 if (err) 1271 goto err_cancel; 1272 1273 nla_nest_end(skb, xdp); 1274 return 0; 1275 1276 err_cancel: 1277 nla_nest_cancel(skb, xdp); 1278 return err; 1279 } 1280 1281 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1282 int type, u32 pid, u32 seq, u32 change, 1283 unsigned int flags, u32 ext_filter_mask) 1284 { 1285 struct ifinfomsg *ifm; 1286 struct nlmsghdr *nlh; 1287 struct nlattr *af_spec; 1288 struct rtnl_af_ops *af_ops; 1289 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1290 1291 ASSERT_RTNL(); 1292 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1293 if (nlh == NULL) 1294 return -EMSGSIZE; 1295 1296 ifm = nlmsg_data(nlh); 1297 ifm->ifi_family = AF_UNSPEC; 1298 ifm->__ifi_pad = 0; 1299 ifm->ifi_type = dev->type; 1300 ifm->ifi_index = dev->ifindex; 1301 ifm->ifi_flags = dev_get_flags(dev); 1302 ifm->ifi_change = change; 1303 1304 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1305 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1306 nla_put_u8(skb, IFLA_OPERSTATE, 1307 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1308 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1309 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1310 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1311 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1312 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1313 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) || 1314 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) || 1315 #ifdef CONFIG_RPS 1316 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1317 #endif 1318 (dev->ifindex != dev_get_iflink(dev) && 1319 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1320 (upper_dev && 1321 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1322 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1323 (dev->qdisc && 1324 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1325 (dev->ifalias && 1326 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1327 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1328 atomic_read(&dev->carrier_changes)) || 1329 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1330 goto nla_put_failure; 1331 1332 if (rtnl_fill_link_ifmap(skb, dev)) 1333 goto nla_put_failure; 1334 1335 if (dev->addr_len) { 1336 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1337 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1338 goto nla_put_failure; 1339 } 1340 1341 if (rtnl_phys_port_id_fill(skb, dev)) 1342 goto nla_put_failure; 1343 1344 if (rtnl_phys_port_name_fill(skb, dev)) 1345 goto nla_put_failure; 1346 1347 if (rtnl_phys_switch_id_fill(skb, dev)) 1348 goto nla_put_failure; 1349 1350 if (rtnl_fill_stats(skb, dev)) 1351 goto nla_put_failure; 1352 1353 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1354 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1355 goto nla_put_failure; 1356 1357 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent && 1358 ext_filter_mask & RTEXT_FILTER_VF) { 1359 int i; 1360 struct nlattr *vfinfo; 1361 int num_vfs = dev_num_vf(dev->dev.parent); 1362 1363 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1364 if (!vfinfo) 1365 goto nla_put_failure; 1366 for (i = 0; i < num_vfs; i++) { 1367 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1368 goto nla_put_failure; 1369 } 1370 1371 nla_nest_end(skb, vfinfo); 1372 } 1373 1374 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1375 goto nla_put_failure; 1376 1377 if (rtnl_xdp_fill(skb, dev)) 1378 goto nla_put_failure; 1379 1380 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1381 if (rtnl_link_fill(skb, dev) < 0) 1382 goto nla_put_failure; 1383 } 1384 1385 if (dev->rtnl_link_ops && 1386 dev->rtnl_link_ops->get_link_net) { 1387 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1388 1389 if (!net_eq(dev_net(dev), link_net)) { 1390 int id = peernet2id_alloc(dev_net(dev), link_net); 1391 1392 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1393 goto nla_put_failure; 1394 } 1395 } 1396 1397 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1398 goto nla_put_failure; 1399 1400 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1401 if (af_ops->fill_link_af) { 1402 struct nlattr *af; 1403 int err; 1404 1405 if (!(af = nla_nest_start(skb, af_ops->family))) 1406 goto nla_put_failure; 1407 1408 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1409 1410 /* 1411 * Caller may return ENODATA to indicate that there 1412 * was no data to be dumped. This is not an error, it 1413 * means we should trim the attribute header and 1414 * continue. 1415 */ 1416 if (err == -ENODATA) 1417 nla_nest_cancel(skb, af); 1418 else if (err < 0) 1419 goto nla_put_failure; 1420 1421 nla_nest_end(skb, af); 1422 } 1423 } 1424 1425 nla_nest_end(skb, af_spec); 1426 1427 nlmsg_end(skb, nlh); 1428 return 0; 1429 1430 nla_put_failure: 1431 nlmsg_cancel(skb, nlh); 1432 return -EMSGSIZE; 1433 } 1434 1435 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1436 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1437 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1438 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1439 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1440 [IFLA_MTU] = { .type = NLA_U32 }, 1441 [IFLA_LINK] = { .type = NLA_U32 }, 1442 [IFLA_MASTER] = { .type = NLA_U32 }, 1443 [IFLA_CARRIER] = { .type = NLA_U8 }, 1444 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1445 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1446 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1447 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1448 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1449 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1450 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1451 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1452 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1453 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1454 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1455 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1456 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1457 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1458 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1459 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1460 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1461 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1462 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1463 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1464 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1465 [IFLA_XDP] = { .type = NLA_NESTED }, 1466 }; 1467 1468 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1469 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1470 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1471 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1472 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1473 }; 1474 1475 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1476 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1477 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1478 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED }, 1479 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1480 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1481 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1482 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1483 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1484 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1485 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1486 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1487 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1488 }; 1489 1490 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1491 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1492 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1493 .len = PORT_PROFILE_MAX }, 1494 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1495 .len = sizeof(struct ifla_port_vsi)}, 1496 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1497 .len = PORT_UUID_MAX }, 1498 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1499 .len = PORT_UUID_MAX }, 1500 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1501 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1502 }; 1503 1504 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = { 1505 [IFLA_XDP_FD] = { .type = NLA_S32 }, 1506 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 }, 1507 }; 1508 1509 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 1510 { 1511 const struct rtnl_link_ops *ops = NULL; 1512 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 1513 1514 if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0) 1515 return NULL; 1516 1517 if (linfo[IFLA_INFO_KIND]) { 1518 char kind[MODULE_NAME_LEN]; 1519 1520 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 1521 ops = rtnl_link_ops_get(kind); 1522 } 1523 1524 return ops; 1525 } 1526 1527 static bool link_master_filtered(struct net_device *dev, int master_idx) 1528 { 1529 struct net_device *master; 1530 1531 if (!master_idx) 1532 return false; 1533 1534 master = netdev_master_upper_dev_get(dev); 1535 if (!master || master->ifindex != master_idx) 1536 return true; 1537 1538 return false; 1539 } 1540 1541 static bool link_kind_filtered(const struct net_device *dev, 1542 const struct rtnl_link_ops *kind_ops) 1543 { 1544 if (kind_ops && dev->rtnl_link_ops != kind_ops) 1545 return true; 1546 1547 return false; 1548 } 1549 1550 static bool link_dump_filtered(struct net_device *dev, 1551 int master_idx, 1552 const struct rtnl_link_ops *kind_ops) 1553 { 1554 if (link_master_filtered(dev, master_idx) || 1555 link_kind_filtered(dev, kind_ops)) 1556 return true; 1557 1558 return false; 1559 } 1560 1561 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1562 { 1563 struct net *net = sock_net(skb->sk); 1564 int h, s_h; 1565 int idx = 0, s_idx; 1566 struct net_device *dev; 1567 struct hlist_head *head; 1568 struct nlattr *tb[IFLA_MAX+1]; 1569 u32 ext_filter_mask = 0; 1570 const struct rtnl_link_ops *kind_ops = NULL; 1571 unsigned int flags = NLM_F_MULTI; 1572 int master_idx = 0; 1573 int err; 1574 int hdrlen; 1575 1576 s_h = cb->args[0]; 1577 s_idx = cb->args[1]; 1578 1579 cb->seq = net->dev_base_seq; 1580 1581 /* A hack to preserve kernel<->userspace interface. 1582 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1583 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1584 * what iproute2 < v3.9.0 used. 1585 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1586 * attribute, its netlink message is shorter than struct ifinfomsg. 1587 */ 1588 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1589 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1590 1591 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1592 1593 if (tb[IFLA_EXT_MASK]) 1594 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1595 1596 if (tb[IFLA_MASTER]) 1597 master_idx = nla_get_u32(tb[IFLA_MASTER]); 1598 1599 if (tb[IFLA_LINKINFO]) 1600 kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]); 1601 1602 if (master_idx || kind_ops) 1603 flags |= NLM_F_DUMP_FILTERED; 1604 } 1605 1606 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1607 idx = 0; 1608 head = &net->dev_index_head[h]; 1609 hlist_for_each_entry(dev, head, index_hlist) { 1610 if (link_dump_filtered(dev, master_idx, kind_ops)) 1611 continue; 1612 if (idx < s_idx) 1613 goto cont; 1614 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1615 NETLINK_CB(cb->skb).portid, 1616 cb->nlh->nlmsg_seq, 0, 1617 flags, 1618 ext_filter_mask); 1619 /* If we ran out of room on the first message, 1620 * we're in trouble 1621 */ 1622 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1623 1624 if (err < 0) 1625 goto out; 1626 1627 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1628 cont: 1629 idx++; 1630 } 1631 } 1632 out: 1633 cb->args[1] = idx; 1634 cb->args[0] = h; 1635 1636 return skb->len; 1637 } 1638 1639 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1640 { 1641 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1642 } 1643 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1644 1645 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1646 { 1647 struct net *net; 1648 /* Examine the link attributes and figure out which 1649 * network namespace we are talking about. 1650 */ 1651 if (tb[IFLA_NET_NS_PID]) 1652 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1653 else if (tb[IFLA_NET_NS_FD]) 1654 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1655 else 1656 net = get_net(src_net); 1657 return net; 1658 } 1659 EXPORT_SYMBOL(rtnl_link_get_net); 1660 1661 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1662 { 1663 if (dev) { 1664 if (tb[IFLA_ADDRESS] && 1665 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1666 return -EINVAL; 1667 1668 if (tb[IFLA_BROADCAST] && 1669 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1670 return -EINVAL; 1671 } 1672 1673 if (tb[IFLA_AF_SPEC]) { 1674 struct nlattr *af; 1675 int rem, err; 1676 1677 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1678 const struct rtnl_af_ops *af_ops; 1679 1680 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1681 return -EAFNOSUPPORT; 1682 1683 if (!af_ops->set_link_af) 1684 return -EOPNOTSUPP; 1685 1686 if (af_ops->validate_link_af) { 1687 err = af_ops->validate_link_af(dev, af); 1688 if (err < 0) 1689 return err; 1690 } 1691 } 1692 } 1693 1694 return 0; 1695 } 1696 1697 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt, 1698 int guid_type) 1699 { 1700 const struct net_device_ops *ops = dev->netdev_ops; 1701 1702 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type); 1703 } 1704 1705 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type) 1706 { 1707 if (dev->type != ARPHRD_INFINIBAND) 1708 return -EOPNOTSUPP; 1709 1710 return handle_infiniband_guid(dev, ivt, guid_type); 1711 } 1712 1713 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 1714 { 1715 const struct net_device_ops *ops = dev->netdev_ops; 1716 int err = -EINVAL; 1717 1718 if (tb[IFLA_VF_MAC]) { 1719 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 1720 1721 err = -EOPNOTSUPP; 1722 if (ops->ndo_set_vf_mac) 1723 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1724 ivm->mac); 1725 if (err < 0) 1726 return err; 1727 } 1728 1729 if (tb[IFLA_VF_VLAN]) { 1730 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 1731 1732 err = -EOPNOTSUPP; 1733 if (ops->ndo_set_vf_vlan) 1734 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 1735 ivv->qos, 1736 htons(ETH_P_8021Q)); 1737 if (err < 0) 1738 return err; 1739 } 1740 1741 if (tb[IFLA_VF_VLAN_LIST]) { 1742 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN]; 1743 struct nlattr *attr; 1744 int rem, len = 0; 1745 1746 err = -EOPNOTSUPP; 1747 if (!ops->ndo_set_vf_vlan) 1748 return err; 1749 1750 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) { 1751 if (nla_type(attr) != IFLA_VF_VLAN_INFO || 1752 nla_len(attr) < NLA_HDRLEN) { 1753 return -EINVAL; 1754 } 1755 if (len >= MAX_VLAN_LIST_LEN) 1756 return -EOPNOTSUPP; 1757 ivvl[len] = nla_data(attr); 1758 1759 len++; 1760 } 1761 if (len == 0) 1762 return -EINVAL; 1763 1764 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan, 1765 ivvl[0]->qos, ivvl[0]->vlan_proto); 1766 if (err < 0) 1767 return err; 1768 } 1769 1770 if (tb[IFLA_VF_TX_RATE]) { 1771 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1772 struct ifla_vf_info ivf; 1773 1774 err = -EOPNOTSUPP; 1775 if (ops->ndo_get_vf_config) 1776 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 1777 if (err < 0) 1778 return err; 1779 1780 err = -EOPNOTSUPP; 1781 if (ops->ndo_set_vf_rate) 1782 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1783 ivf.min_tx_rate, 1784 ivt->rate); 1785 if (err < 0) 1786 return err; 1787 } 1788 1789 if (tb[IFLA_VF_RATE]) { 1790 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 1791 1792 err = -EOPNOTSUPP; 1793 if (ops->ndo_set_vf_rate) 1794 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1795 ivt->min_tx_rate, 1796 ivt->max_tx_rate); 1797 if (err < 0) 1798 return err; 1799 } 1800 1801 if (tb[IFLA_VF_SPOOFCHK]) { 1802 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 1803 1804 err = -EOPNOTSUPP; 1805 if (ops->ndo_set_vf_spoofchk) 1806 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1807 ivs->setting); 1808 if (err < 0) 1809 return err; 1810 } 1811 1812 if (tb[IFLA_VF_LINK_STATE]) { 1813 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 1814 1815 err = -EOPNOTSUPP; 1816 if (ops->ndo_set_vf_link_state) 1817 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1818 ivl->link_state); 1819 if (err < 0) 1820 return err; 1821 } 1822 1823 if (tb[IFLA_VF_RSS_QUERY_EN]) { 1824 struct ifla_vf_rss_query_en *ivrssq_en; 1825 1826 err = -EOPNOTSUPP; 1827 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 1828 if (ops->ndo_set_vf_rss_query_en) 1829 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 1830 ivrssq_en->setting); 1831 if (err < 0) 1832 return err; 1833 } 1834 1835 if (tb[IFLA_VF_TRUST]) { 1836 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 1837 1838 err = -EOPNOTSUPP; 1839 if (ops->ndo_set_vf_trust) 1840 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 1841 if (err < 0) 1842 return err; 1843 } 1844 1845 if (tb[IFLA_VF_IB_NODE_GUID]) { 1846 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]); 1847 1848 if (!ops->ndo_set_vf_guid) 1849 return -EOPNOTSUPP; 1850 1851 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID); 1852 } 1853 1854 if (tb[IFLA_VF_IB_PORT_GUID]) { 1855 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]); 1856 1857 if (!ops->ndo_set_vf_guid) 1858 return -EOPNOTSUPP; 1859 1860 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID); 1861 } 1862 1863 return err; 1864 } 1865 1866 static int do_set_master(struct net_device *dev, int ifindex) 1867 { 1868 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1869 const struct net_device_ops *ops; 1870 int err; 1871 1872 if (upper_dev) { 1873 if (upper_dev->ifindex == ifindex) 1874 return 0; 1875 ops = upper_dev->netdev_ops; 1876 if (ops->ndo_del_slave) { 1877 err = ops->ndo_del_slave(upper_dev, dev); 1878 if (err) 1879 return err; 1880 } else { 1881 return -EOPNOTSUPP; 1882 } 1883 } 1884 1885 if (ifindex) { 1886 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1887 if (!upper_dev) 1888 return -EINVAL; 1889 ops = upper_dev->netdev_ops; 1890 if (ops->ndo_add_slave) { 1891 err = ops->ndo_add_slave(upper_dev, dev); 1892 if (err) 1893 return err; 1894 } else { 1895 return -EOPNOTSUPP; 1896 } 1897 } 1898 return 0; 1899 } 1900 1901 #define DO_SETLINK_MODIFIED 0x01 1902 /* notify flag means notify + modified. */ 1903 #define DO_SETLINK_NOTIFY 0x03 1904 static int do_setlink(const struct sk_buff *skb, 1905 struct net_device *dev, struct ifinfomsg *ifm, 1906 struct nlattr **tb, char *ifname, int status) 1907 { 1908 const struct net_device_ops *ops = dev->netdev_ops; 1909 int err; 1910 1911 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1912 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1913 if (IS_ERR(net)) { 1914 err = PTR_ERR(net); 1915 goto errout; 1916 } 1917 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1918 put_net(net); 1919 err = -EPERM; 1920 goto errout; 1921 } 1922 err = dev_change_net_namespace(dev, net, ifname); 1923 put_net(net); 1924 if (err) 1925 goto errout; 1926 status |= DO_SETLINK_MODIFIED; 1927 } 1928 1929 if (tb[IFLA_MAP]) { 1930 struct rtnl_link_ifmap *u_map; 1931 struct ifmap k_map; 1932 1933 if (!ops->ndo_set_config) { 1934 err = -EOPNOTSUPP; 1935 goto errout; 1936 } 1937 1938 if (!netif_device_present(dev)) { 1939 err = -ENODEV; 1940 goto errout; 1941 } 1942 1943 u_map = nla_data(tb[IFLA_MAP]); 1944 k_map.mem_start = (unsigned long) u_map->mem_start; 1945 k_map.mem_end = (unsigned long) u_map->mem_end; 1946 k_map.base_addr = (unsigned short) u_map->base_addr; 1947 k_map.irq = (unsigned char) u_map->irq; 1948 k_map.dma = (unsigned char) u_map->dma; 1949 k_map.port = (unsigned char) u_map->port; 1950 1951 err = ops->ndo_set_config(dev, &k_map); 1952 if (err < 0) 1953 goto errout; 1954 1955 status |= DO_SETLINK_NOTIFY; 1956 } 1957 1958 if (tb[IFLA_ADDRESS]) { 1959 struct sockaddr *sa; 1960 int len; 1961 1962 len = sizeof(sa_family_t) + dev->addr_len; 1963 sa = kmalloc(len, GFP_KERNEL); 1964 if (!sa) { 1965 err = -ENOMEM; 1966 goto errout; 1967 } 1968 sa->sa_family = dev->type; 1969 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1970 dev->addr_len); 1971 err = dev_set_mac_address(dev, sa); 1972 kfree(sa); 1973 if (err) 1974 goto errout; 1975 status |= DO_SETLINK_MODIFIED; 1976 } 1977 1978 if (tb[IFLA_MTU]) { 1979 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1980 if (err < 0) 1981 goto errout; 1982 status |= DO_SETLINK_MODIFIED; 1983 } 1984 1985 if (tb[IFLA_GROUP]) { 1986 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1987 status |= DO_SETLINK_NOTIFY; 1988 } 1989 1990 /* 1991 * Interface selected by interface index but interface 1992 * name provided implies that a name change has been 1993 * requested. 1994 */ 1995 if (ifm->ifi_index > 0 && ifname[0]) { 1996 err = dev_change_name(dev, ifname); 1997 if (err < 0) 1998 goto errout; 1999 status |= DO_SETLINK_MODIFIED; 2000 } 2001 2002 if (tb[IFLA_IFALIAS]) { 2003 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 2004 nla_len(tb[IFLA_IFALIAS])); 2005 if (err < 0) 2006 goto errout; 2007 status |= DO_SETLINK_NOTIFY; 2008 } 2009 2010 if (tb[IFLA_BROADCAST]) { 2011 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 2012 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 2013 } 2014 2015 if (ifm->ifi_flags || ifm->ifi_change) { 2016 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2017 if (err < 0) 2018 goto errout; 2019 } 2020 2021 if (tb[IFLA_MASTER]) { 2022 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 2023 if (err) 2024 goto errout; 2025 status |= DO_SETLINK_MODIFIED; 2026 } 2027 2028 if (tb[IFLA_CARRIER]) { 2029 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 2030 if (err) 2031 goto errout; 2032 status |= DO_SETLINK_MODIFIED; 2033 } 2034 2035 if (tb[IFLA_TXQLEN]) { 2036 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 2037 unsigned long orig_len = dev->tx_queue_len; 2038 2039 if (dev->tx_queue_len ^ value) { 2040 dev->tx_queue_len = value; 2041 err = call_netdevice_notifiers( 2042 NETDEV_CHANGE_TX_QUEUE_LEN, dev); 2043 err = notifier_to_errno(err); 2044 if (err) { 2045 dev->tx_queue_len = orig_len; 2046 goto errout; 2047 } 2048 status |= DO_SETLINK_NOTIFY; 2049 } 2050 } 2051 2052 if (tb[IFLA_OPERSTATE]) 2053 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2054 2055 if (tb[IFLA_LINKMODE]) { 2056 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 2057 2058 write_lock_bh(&dev_base_lock); 2059 if (dev->link_mode ^ value) 2060 status |= DO_SETLINK_NOTIFY; 2061 dev->link_mode = value; 2062 write_unlock_bh(&dev_base_lock); 2063 } 2064 2065 if (tb[IFLA_VFINFO_LIST]) { 2066 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 2067 struct nlattr *attr; 2068 int rem; 2069 2070 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 2071 if (nla_type(attr) != IFLA_VF_INFO || 2072 nla_len(attr) < NLA_HDRLEN) { 2073 err = -EINVAL; 2074 goto errout; 2075 } 2076 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 2077 ifla_vf_policy); 2078 if (err < 0) 2079 goto errout; 2080 err = do_setvfinfo(dev, vfinfo); 2081 if (err < 0) 2082 goto errout; 2083 status |= DO_SETLINK_NOTIFY; 2084 } 2085 } 2086 err = 0; 2087 2088 if (tb[IFLA_VF_PORTS]) { 2089 struct nlattr *port[IFLA_PORT_MAX+1]; 2090 struct nlattr *attr; 2091 int vf; 2092 int rem; 2093 2094 err = -EOPNOTSUPP; 2095 if (!ops->ndo_set_vf_port) 2096 goto errout; 2097 2098 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 2099 if (nla_type(attr) != IFLA_VF_PORT || 2100 nla_len(attr) < NLA_HDRLEN) { 2101 err = -EINVAL; 2102 goto errout; 2103 } 2104 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 2105 ifla_port_policy); 2106 if (err < 0) 2107 goto errout; 2108 if (!port[IFLA_PORT_VF]) { 2109 err = -EOPNOTSUPP; 2110 goto errout; 2111 } 2112 vf = nla_get_u32(port[IFLA_PORT_VF]); 2113 err = ops->ndo_set_vf_port(dev, vf, port); 2114 if (err < 0) 2115 goto errout; 2116 status |= DO_SETLINK_NOTIFY; 2117 } 2118 } 2119 err = 0; 2120 2121 if (tb[IFLA_PORT_SELF]) { 2122 struct nlattr *port[IFLA_PORT_MAX+1]; 2123 2124 err = nla_parse_nested(port, IFLA_PORT_MAX, 2125 tb[IFLA_PORT_SELF], ifla_port_policy); 2126 if (err < 0) 2127 goto errout; 2128 2129 err = -EOPNOTSUPP; 2130 if (ops->ndo_set_vf_port) 2131 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 2132 if (err < 0) 2133 goto errout; 2134 status |= DO_SETLINK_NOTIFY; 2135 } 2136 2137 if (tb[IFLA_AF_SPEC]) { 2138 struct nlattr *af; 2139 int rem; 2140 2141 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2142 const struct rtnl_af_ops *af_ops; 2143 2144 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 2145 BUG(); 2146 2147 err = af_ops->set_link_af(dev, af); 2148 if (err < 0) 2149 goto errout; 2150 2151 status |= DO_SETLINK_NOTIFY; 2152 } 2153 } 2154 err = 0; 2155 2156 if (tb[IFLA_PROTO_DOWN]) { 2157 err = dev_change_proto_down(dev, 2158 nla_get_u8(tb[IFLA_PROTO_DOWN])); 2159 if (err) 2160 goto errout; 2161 status |= DO_SETLINK_NOTIFY; 2162 } 2163 2164 if (tb[IFLA_XDP]) { 2165 struct nlattr *xdp[IFLA_XDP_MAX + 1]; 2166 2167 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP], 2168 ifla_xdp_policy); 2169 if (err < 0) 2170 goto errout; 2171 2172 if (xdp[IFLA_XDP_ATTACHED]) { 2173 err = -EINVAL; 2174 goto errout; 2175 } 2176 if (xdp[IFLA_XDP_FD]) { 2177 err = dev_change_xdp_fd(dev, 2178 nla_get_s32(xdp[IFLA_XDP_FD])); 2179 if (err) 2180 goto errout; 2181 status |= DO_SETLINK_NOTIFY; 2182 } 2183 } 2184 2185 errout: 2186 if (status & DO_SETLINK_MODIFIED) { 2187 if (status & DO_SETLINK_NOTIFY) 2188 netdev_state_change(dev); 2189 2190 if (err < 0) 2191 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", 2192 dev->name); 2193 } 2194 2195 return err; 2196 } 2197 2198 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2199 { 2200 struct net *net = sock_net(skb->sk); 2201 struct ifinfomsg *ifm; 2202 struct net_device *dev; 2203 int err; 2204 struct nlattr *tb[IFLA_MAX+1]; 2205 char ifname[IFNAMSIZ]; 2206 2207 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2208 if (err < 0) 2209 goto errout; 2210 2211 if (tb[IFLA_IFNAME]) 2212 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2213 else 2214 ifname[0] = '\0'; 2215 2216 err = -EINVAL; 2217 ifm = nlmsg_data(nlh); 2218 if (ifm->ifi_index > 0) 2219 dev = __dev_get_by_index(net, ifm->ifi_index); 2220 else if (tb[IFLA_IFNAME]) 2221 dev = __dev_get_by_name(net, ifname); 2222 else 2223 goto errout; 2224 2225 if (dev == NULL) { 2226 err = -ENODEV; 2227 goto errout; 2228 } 2229 2230 err = validate_linkmsg(dev, tb); 2231 if (err < 0) 2232 goto errout; 2233 2234 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 2235 errout: 2236 return err; 2237 } 2238 2239 static int rtnl_group_dellink(const struct net *net, int group) 2240 { 2241 struct net_device *dev, *aux; 2242 LIST_HEAD(list_kill); 2243 bool found = false; 2244 2245 if (!group) 2246 return -EPERM; 2247 2248 for_each_netdev(net, dev) { 2249 if (dev->group == group) { 2250 const struct rtnl_link_ops *ops; 2251 2252 found = true; 2253 ops = dev->rtnl_link_ops; 2254 if (!ops || !ops->dellink) 2255 return -EOPNOTSUPP; 2256 } 2257 } 2258 2259 if (!found) 2260 return -ENODEV; 2261 2262 for_each_netdev_safe(net, dev, aux) { 2263 if (dev->group == group) { 2264 const struct rtnl_link_ops *ops; 2265 2266 ops = dev->rtnl_link_ops; 2267 ops->dellink(dev, &list_kill); 2268 } 2269 } 2270 unregister_netdevice_many(&list_kill); 2271 2272 return 0; 2273 } 2274 2275 int rtnl_delete_link(struct net_device *dev) 2276 { 2277 const struct rtnl_link_ops *ops; 2278 LIST_HEAD(list_kill); 2279 2280 ops = dev->rtnl_link_ops; 2281 if (!ops || !ops->dellink) 2282 return -EOPNOTSUPP; 2283 2284 ops->dellink(dev, &list_kill); 2285 unregister_netdevice_many(&list_kill); 2286 2287 return 0; 2288 } 2289 EXPORT_SYMBOL_GPL(rtnl_delete_link); 2290 2291 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2292 { 2293 struct net *net = sock_net(skb->sk); 2294 struct net_device *dev; 2295 struct ifinfomsg *ifm; 2296 char ifname[IFNAMSIZ]; 2297 struct nlattr *tb[IFLA_MAX+1]; 2298 int err; 2299 2300 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2301 if (err < 0) 2302 return err; 2303 2304 if (tb[IFLA_IFNAME]) 2305 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2306 2307 ifm = nlmsg_data(nlh); 2308 if (ifm->ifi_index > 0) 2309 dev = __dev_get_by_index(net, ifm->ifi_index); 2310 else if (tb[IFLA_IFNAME]) 2311 dev = __dev_get_by_name(net, ifname); 2312 else if (tb[IFLA_GROUP]) 2313 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 2314 else 2315 return -EINVAL; 2316 2317 if (!dev) 2318 return -ENODEV; 2319 2320 return rtnl_delete_link(dev); 2321 } 2322 2323 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 2324 { 2325 unsigned int old_flags; 2326 int err; 2327 2328 old_flags = dev->flags; 2329 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2330 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2331 if (err < 0) 2332 return err; 2333 } 2334 2335 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2336 2337 __dev_notify_flags(dev, old_flags, ~0U); 2338 return 0; 2339 } 2340 EXPORT_SYMBOL(rtnl_configure_link); 2341 2342 struct net_device *rtnl_create_link(struct net *net, 2343 const char *ifname, unsigned char name_assign_type, 2344 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2345 { 2346 int err; 2347 struct net_device *dev; 2348 unsigned int num_tx_queues = 1; 2349 unsigned int num_rx_queues = 1; 2350 2351 if (tb[IFLA_NUM_TX_QUEUES]) 2352 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2353 else if (ops->get_num_tx_queues) 2354 num_tx_queues = ops->get_num_tx_queues(); 2355 2356 if (tb[IFLA_NUM_RX_QUEUES]) 2357 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2358 else if (ops->get_num_rx_queues) 2359 num_rx_queues = ops->get_num_rx_queues(); 2360 2361 err = -ENOMEM; 2362 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2363 ops->setup, num_tx_queues, num_rx_queues); 2364 if (!dev) 2365 goto err; 2366 2367 dev_net_set(dev, net); 2368 dev->rtnl_link_ops = ops; 2369 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2370 2371 if (tb[IFLA_MTU]) 2372 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2373 if (tb[IFLA_ADDRESS]) { 2374 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2375 nla_len(tb[IFLA_ADDRESS])); 2376 dev->addr_assign_type = NET_ADDR_SET; 2377 } 2378 if (tb[IFLA_BROADCAST]) 2379 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2380 nla_len(tb[IFLA_BROADCAST])); 2381 if (tb[IFLA_TXQLEN]) 2382 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2383 if (tb[IFLA_OPERSTATE]) 2384 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2385 if (tb[IFLA_LINKMODE]) 2386 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2387 if (tb[IFLA_GROUP]) 2388 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2389 2390 return dev; 2391 2392 err: 2393 return ERR_PTR(err); 2394 } 2395 EXPORT_SYMBOL(rtnl_create_link); 2396 2397 static int rtnl_group_changelink(const struct sk_buff *skb, 2398 struct net *net, int group, 2399 struct ifinfomsg *ifm, 2400 struct nlattr **tb) 2401 { 2402 struct net_device *dev, *aux; 2403 int err; 2404 2405 for_each_netdev_safe(net, dev, aux) { 2406 if (dev->group == group) { 2407 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2408 if (err < 0) 2409 return err; 2410 } 2411 } 2412 2413 return 0; 2414 } 2415 2416 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2417 { 2418 struct net *net = sock_net(skb->sk); 2419 const struct rtnl_link_ops *ops; 2420 const struct rtnl_link_ops *m_ops = NULL; 2421 struct net_device *dev; 2422 struct net_device *master_dev = NULL; 2423 struct ifinfomsg *ifm; 2424 char kind[MODULE_NAME_LEN]; 2425 char ifname[IFNAMSIZ]; 2426 struct nlattr *tb[IFLA_MAX+1]; 2427 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2428 unsigned char name_assign_type = NET_NAME_USER; 2429 int err; 2430 2431 #ifdef CONFIG_MODULES 2432 replay: 2433 #endif 2434 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2435 if (err < 0) 2436 return err; 2437 2438 if (tb[IFLA_IFNAME]) 2439 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2440 else 2441 ifname[0] = '\0'; 2442 2443 ifm = nlmsg_data(nlh); 2444 if (ifm->ifi_index > 0) 2445 dev = __dev_get_by_index(net, ifm->ifi_index); 2446 else { 2447 if (ifname[0]) 2448 dev = __dev_get_by_name(net, ifname); 2449 else 2450 dev = NULL; 2451 } 2452 2453 if (dev) { 2454 master_dev = netdev_master_upper_dev_get(dev); 2455 if (master_dev) 2456 m_ops = master_dev->rtnl_link_ops; 2457 } 2458 2459 err = validate_linkmsg(dev, tb); 2460 if (err < 0) 2461 return err; 2462 2463 if (tb[IFLA_LINKINFO]) { 2464 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2465 tb[IFLA_LINKINFO], ifla_info_policy); 2466 if (err < 0) 2467 return err; 2468 } else 2469 memset(linkinfo, 0, sizeof(linkinfo)); 2470 2471 if (linkinfo[IFLA_INFO_KIND]) { 2472 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2473 ops = rtnl_link_ops_get(kind); 2474 } else { 2475 kind[0] = '\0'; 2476 ops = NULL; 2477 } 2478 2479 if (1) { 2480 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2481 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2482 struct nlattr **data = NULL; 2483 struct nlattr **slave_data = NULL; 2484 struct net *dest_net, *link_net = NULL; 2485 2486 if (ops) { 2487 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2488 err = nla_parse_nested(attr, ops->maxtype, 2489 linkinfo[IFLA_INFO_DATA], 2490 ops->policy); 2491 if (err < 0) 2492 return err; 2493 data = attr; 2494 } 2495 if (ops->validate) { 2496 err = ops->validate(tb, data); 2497 if (err < 0) 2498 return err; 2499 } 2500 } 2501 2502 if (m_ops) { 2503 if (m_ops->slave_maxtype && 2504 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2505 err = nla_parse_nested(slave_attr, 2506 m_ops->slave_maxtype, 2507 linkinfo[IFLA_INFO_SLAVE_DATA], 2508 m_ops->slave_policy); 2509 if (err < 0) 2510 return err; 2511 slave_data = slave_attr; 2512 } 2513 if (m_ops->slave_validate) { 2514 err = m_ops->slave_validate(tb, slave_data); 2515 if (err < 0) 2516 return err; 2517 } 2518 } 2519 2520 if (dev) { 2521 int status = 0; 2522 2523 if (nlh->nlmsg_flags & NLM_F_EXCL) 2524 return -EEXIST; 2525 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2526 return -EOPNOTSUPP; 2527 2528 if (linkinfo[IFLA_INFO_DATA]) { 2529 if (!ops || ops != dev->rtnl_link_ops || 2530 !ops->changelink) 2531 return -EOPNOTSUPP; 2532 2533 err = ops->changelink(dev, tb, data); 2534 if (err < 0) 2535 return err; 2536 status |= DO_SETLINK_NOTIFY; 2537 } 2538 2539 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2540 if (!m_ops || !m_ops->slave_changelink) 2541 return -EOPNOTSUPP; 2542 2543 err = m_ops->slave_changelink(master_dev, dev, 2544 tb, slave_data); 2545 if (err < 0) 2546 return err; 2547 status |= DO_SETLINK_NOTIFY; 2548 } 2549 2550 return do_setlink(skb, dev, ifm, tb, ifname, status); 2551 } 2552 2553 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2554 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2555 return rtnl_group_changelink(skb, net, 2556 nla_get_u32(tb[IFLA_GROUP]), 2557 ifm, tb); 2558 return -ENODEV; 2559 } 2560 2561 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2562 return -EOPNOTSUPP; 2563 2564 if (!ops) { 2565 #ifdef CONFIG_MODULES 2566 if (kind[0]) { 2567 __rtnl_unlock(); 2568 request_module("rtnl-link-%s", kind); 2569 rtnl_lock(); 2570 ops = rtnl_link_ops_get(kind); 2571 if (ops) 2572 goto replay; 2573 } 2574 #endif 2575 return -EOPNOTSUPP; 2576 } 2577 2578 if (!ops->setup) 2579 return -EOPNOTSUPP; 2580 2581 if (!ifname[0]) { 2582 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2583 name_assign_type = NET_NAME_ENUM; 2584 } 2585 2586 dest_net = rtnl_link_get_net(net, tb); 2587 if (IS_ERR(dest_net)) 2588 return PTR_ERR(dest_net); 2589 2590 err = -EPERM; 2591 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2592 goto out; 2593 2594 if (tb[IFLA_LINK_NETNSID]) { 2595 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2596 2597 link_net = get_net_ns_by_id(dest_net, id); 2598 if (!link_net) { 2599 err = -EINVAL; 2600 goto out; 2601 } 2602 err = -EPERM; 2603 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2604 goto out; 2605 } 2606 2607 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2608 name_assign_type, ops, tb); 2609 if (IS_ERR(dev)) { 2610 err = PTR_ERR(dev); 2611 goto out; 2612 } 2613 2614 dev->ifindex = ifm->ifi_index; 2615 2616 if (ops->newlink) { 2617 err = ops->newlink(link_net ? : net, dev, tb, data); 2618 /* Drivers should call free_netdev() in ->destructor 2619 * and unregister it on failure after registration 2620 * so that device could be finally freed in rtnl_unlock. 2621 */ 2622 if (err < 0) { 2623 /* If device is not registered at all, free it now */ 2624 if (dev->reg_state == NETREG_UNINITIALIZED) 2625 free_netdev(dev); 2626 goto out; 2627 } 2628 } else { 2629 err = register_netdevice(dev); 2630 if (err < 0) { 2631 free_netdev(dev); 2632 goto out; 2633 } 2634 } 2635 err = rtnl_configure_link(dev, ifm); 2636 if (err < 0) 2637 goto out_unregister; 2638 if (link_net) { 2639 err = dev_change_net_namespace(dev, dest_net, ifname); 2640 if (err < 0) 2641 goto out_unregister; 2642 } 2643 out: 2644 if (link_net) 2645 put_net(link_net); 2646 put_net(dest_net); 2647 return err; 2648 out_unregister: 2649 if (ops->newlink) { 2650 LIST_HEAD(list_kill); 2651 2652 ops->dellink(dev, &list_kill); 2653 unregister_netdevice_many(&list_kill); 2654 } else { 2655 unregister_netdevice(dev); 2656 } 2657 goto out; 2658 } 2659 } 2660 2661 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2662 { 2663 struct net *net = sock_net(skb->sk); 2664 struct ifinfomsg *ifm; 2665 char ifname[IFNAMSIZ]; 2666 struct nlattr *tb[IFLA_MAX+1]; 2667 struct net_device *dev = NULL; 2668 struct sk_buff *nskb; 2669 int err; 2670 u32 ext_filter_mask = 0; 2671 2672 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2673 if (err < 0) 2674 return err; 2675 2676 if (tb[IFLA_IFNAME]) 2677 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2678 2679 if (tb[IFLA_EXT_MASK]) 2680 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2681 2682 ifm = nlmsg_data(nlh); 2683 if (ifm->ifi_index > 0) 2684 dev = __dev_get_by_index(net, ifm->ifi_index); 2685 else if (tb[IFLA_IFNAME]) 2686 dev = __dev_get_by_name(net, ifname); 2687 else 2688 return -EINVAL; 2689 2690 if (dev == NULL) 2691 return -ENODEV; 2692 2693 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2694 if (nskb == NULL) 2695 return -ENOBUFS; 2696 2697 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2698 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2699 if (err < 0) { 2700 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2701 WARN_ON(err == -EMSGSIZE); 2702 kfree_skb(nskb); 2703 } else 2704 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2705 2706 return err; 2707 } 2708 2709 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2710 { 2711 struct net *net = sock_net(skb->sk); 2712 struct net_device *dev; 2713 struct nlattr *tb[IFLA_MAX+1]; 2714 u32 ext_filter_mask = 0; 2715 u16 min_ifinfo_dump_size = 0; 2716 int hdrlen; 2717 2718 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2719 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2720 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2721 2722 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2723 if (tb[IFLA_EXT_MASK]) 2724 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2725 } 2726 2727 if (!ext_filter_mask) 2728 return NLMSG_GOODSIZE; 2729 /* 2730 * traverse the list of net devices and compute the minimum 2731 * buffer size based upon the filter mask. 2732 */ 2733 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2734 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2735 if_nlmsg_size(dev, 2736 ext_filter_mask)); 2737 } 2738 2739 return min_ifinfo_dump_size; 2740 } 2741 2742 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2743 { 2744 int idx; 2745 int s_idx = cb->family; 2746 2747 if (s_idx == 0) 2748 s_idx = 1; 2749 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2750 int type = cb->nlh->nlmsg_type-RTM_BASE; 2751 if (idx < s_idx || idx == PF_PACKET) 2752 continue; 2753 if (rtnl_msg_handlers[idx] == NULL || 2754 rtnl_msg_handlers[idx][type].dumpit == NULL) 2755 continue; 2756 if (idx > s_idx) { 2757 memset(&cb->args[0], 0, sizeof(cb->args)); 2758 cb->prev_seq = 0; 2759 cb->seq = 0; 2760 } 2761 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2762 break; 2763 } 2764 cb->family = idx; 2765 2766 return skb->len; 2767 } 2768 2769 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2770 unsigned int change, gfp_t flags) 2771 { 2772 struct net *net = dev_net(dev); 2773 struct sk_buff *skb; 2774 int err = -ENOBUFS; 2775 size_t if_info_size; 2776 2777 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2778 if (skb == NULL) 2779 goto errout; 2780 2781 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2782 if (err < 0) { 2783 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2784 WARN_ON(err == -EMSGSIZE); 2785 kfree_skb(skb); 2786 goto errout; 2787 } 2788 return skb; 2789 errout: 2790 if (err < 0) 2791 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2792 return NULL; 2793 } 2794 2795 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2796 { 2797 struct net *net = dev_net(dev); 2798 2799 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2800 } 2801 2802 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2803 gfp_t flags) 2804 { 2805 struct sk_buff *skb; 2806 2807 if (dev->reg_state != NETREG_REGISTERED) 2808 return; 2809 2810 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2811 if (skb) 2812 rtmsg_ifinfo_send(skb, dev, flags); 2813 } 2814 EXPORT_SYMBOL(rtmsg_ifinfo); 2815 2816 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2817 struct net_device *dev, 2818 u8 *addr, u16 vid, u32 pid, u32 seq, 2819 int type, unsigned int flags, 2820 int nlflags, u16 ndm_state) 2821 { 2822 struct nlmsghdr *nlh; 2823 struct ndmsg *ndm; 2824 2825 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2826 if (!nlh) 2827 return -EMSGSIZE; 2828 2829 ndm = nlmsg_data(nlh); 2830 ndm->ndm_family = AF_BRIDGE; 2831 ndm->ndm_pad1 = 0; 2832 ndm->ndm_pad2 = 0; 2833 ndm->ndm_flags = flags; 2834 ndm->ndm_type = 0; 2835 ndm->ndm_ifindex = dev->ifindex; 2836 ndm->ndm_state = ndm_state; 2837 2838 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2839 goto nla_put_failure; 2840 if (vid) 2841 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2842 goto nla_put_failure; 2843 2844 nlmsg_end(skb, nlh); 2845 return 0; 2846 2847 nla_put_failure: 2848 nlmsg_cancel(skb, nlh); 2849 return -EMSGSIZE; 2850 } 2851 2852 static inline size_t rtnl_fdb_nlmsg_size(void) 2853 { 2854 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2855 } 2856 2857 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 2858 u16 ndm_state) 2859 { 2860 struct net *net = dev_net(dev); 2861 struct sk_buff *skb; 2862 int err = -ENOBUFS; 2863 2864 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2865 if (!skb) 2866 goto errout; 2867 2868 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2869 0, 0, type, NTF_SELF, 0, ndm_state); 2870 if (err < 0) { 2871 kfree_skb(skb); 2872 goto errout; 2873 } 2874 2875 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2876 return; 2877 errout: 2878 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2879 } 2880 2881 /** 2882 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2883 */ 2884 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2885 struct nlattr *tb[], 2886 struct net_device *dev, 2887 const unsigned char *addr, u16 vid, 2888 u16 flags) 2889 { 2890 int err = -EINVAL; 2891 2892 /* If aging addresses are supported device will need to 2893 * implement its own handler for this. 2894 */ 2895 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2896 pr_info("%s: FDB only supports static addresses\n", dev->name); 2897 return err; 2898 } 2899 2900 if (vid) { 2901 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2902 return err; 2903 } 2904 2905 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2906 err = dev_uc_add_excl(dev, addr); 2907 else if (is_multicast_ether_addr(addr)) 2908 err = dev_mc_add_excl(dev, addr); 2909 2910 /* Only return duplicate errors if NLM_F_EXCL is set */ 2911 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2912 err = 0; 2913 2914 return err; 2915 } 2916 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2917 2918 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2919 { 2920 u16 vid = 0; 2921 2922 if (vlan_attr) { 2923 if (nla_len(vlan_attr) != sizeof(u16)) { 2924 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2925 return -EINVAL; 2926 } 2927 2928 vid = nla_get_u16(vlan_attr); 2929 2930 if (!vid || vid >= VLAN_VID_MASK) { 2931 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2932 vid); 2933 return -EINVAL; 2934 } 2935 } 2936 *p_vid = vid; 2937 return 0; 2938 } 2939 2940 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2941 { 2942 struct net *net = sock_net(skb->sk); 2943 struct ndmsg *ndm; 2944 struct nlattr *tb[NDA_MAX+1]; 2945 struct net_device *dev; 2946 u8 *addr; 2947 u16 vid; 2948 int err; 2949 2950 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2951 if (err < 0) 2952 return err; 2953 2954 ndm = nlmsg_data(nlh); 2955 if (ndm->ndm_ifindex == 0) { 2956 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2957 return -EINVAL; 2958 } 2959 2960 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2961 if (dev == NULL) { 2962 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2963 return -ENODEV; 2964 } 2965 2966 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2967 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2968 return -EINVAL; 2969 } 2970 2971 addr = nla_data(tb[NDA_LLADDR]); 2972 2973 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2974 if (err) 2975 return err; 2976 2977 err = -EOPNOTSUPP; 2978 2979 /* Support fdb on master device the net/bridge default case */ 2980 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2981 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2982 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2983 const struct net_device_ops *ops = br_dev->netdev_ops; 2984 2985 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2986 nlh->nlmsg_flags); 2987 if (err) 2988 goto out; 2989 else 2990 ndm->ndm_flags &= ~NTF_MASTER; 2991 } 2992 2993 /* Embedded bridge, macvlan, and any other device support */ 2994 if ((ndm->ndm_flags & NTF_SELF)) { 2995 if (dev->netdev_ops->ndo_fdb_add) 2996 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2997 vid, 2998 nlh->nlmsg_flags); 2999 else 3000 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 3001 nlh->nlmsg_flags); 3002 3003 if (!err) { 3004 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 3005 ndm->ndm_state); 3006 ndm->ndm_flags &= ~NTF_SELF; 3007 } 3008 } 3009 out: 3010 return err; 3011 } 3012 3013 /** 3014 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 3015 */ 3016 int ndo_dflt_fdb_del(struct ndmsg *ndm, 3017 struct nlattr *tb[], 3018 struct net_device *dev, 3019 const unsigned char *addr, u16 vid) 3020 { 3021 int err = -EINVAL; 3022 3023 /* If aging addresses are supported device will need to 3024 * implement its own handler for this. 3025 */ 3026 if (!(ndm->ndm_state & NUD_PERMANENT)) { 3027 pr_info("%s: FDB only supports static addresses\n", dev->name); 3028 return err; 3029 } 3030 3031 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 3032 err = dev_uc_del(dev, addr); 3033 else if (is_multicast_ether_addr(addr)) 3034 err = dev_mc_del(dev, addr); 3035 3036 return err; 3037 } 3038 EXPORT_SYMBOL(ndo_dflt_fdb_del); 3039 3040 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 3041 { 3042 struct net *net = sock_net(skb->sk); 3043 struct ndmsg *ndm; 3044 struct nlattr *tb[NDA_MAX+1]; 3045 struct net_device *dev; 3046 int err = -EINVAL; 3047 __u8 *addr; 3048 u16 vid; 3049 3050 if (!netlink_capable(skb, CAP_NET_ADMIN)) 3051 return -EPERM; 3052 3053 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 3054 if (err < 0) 3055 return err; 3056 3057 ndm = nlmsg_data(nlh); 3058 if (ndm->ndm_ifindex == 0) { 3059 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 3060 return -EINVAL; 3061 } 3062 3063 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 3064 if (dev == NULL) { 3065 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 3066 return -ENODEV; 3067 } 3068 3069 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 3070 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 3071 return -EINVAL; 3072 } 3073 3074 addr = nla_data(tb[NDA_LLADDR]); 3075 3076 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 3077 if (err) 3078 return err; 3079 3080 err = -EOPNOTSUPP; 3081 3082 /* Support fdb on master device the net/bridge default case */ 3083 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 3084 (dev->priv_flags & IFF_BRIDGE_PORT)) { 3085 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3086 const struct net_device_ops *ops = br_dev->netdev_ops; 3087 3088 if (ops->ndo_fdb_del) 3089 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 3090 3091 if (err) 3092 goto out; 3093 else 3094 ndm->ndm_flags &= ~NTF_MASTER; 3095 } 3096 3097 /* Embedded bridge, macvlan, and any other device support */ 3098 if (ndm->ndm_flags & NTF_SELF) { 3099 if (dev->netdev_ops->ndo_fdb_del) 3100 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 3101 vid); 3102 else 3103 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 3104 3105 if (!err) { 3106 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 3107 ndm->ndm_state); 3108 ndm->ndm_flags &= ~NTF_SELF; 3109 } 3110 } 3111 out: 3112 return err; 3113 } 3114 3115 static int nlmsg_populate_fdb(struct sk_buff *skb, 3116 struct netlink_callback *cb, 3117 struct net_device *dev, 3118 int *idx, 3119 struct netdev_hw_addr_list *list) 3120 { 3121 struct netdev_hw_addr *ha; 3122 int err; 3123 u32 portid, seq; 3124 3125 portid = NETLINK_CB(cb->skb).portid; 3126 seq = cb->nlh->nlmsg_seq; 3127 3128 list_for_each_entry(ha, &list->list, list) { 3129 if (*idx < cb->args[2]) 3130 goto skip; 3131 3132 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 3133 portid, seq, 3134 RTM_NEWNEIGH, NTF_SELF, 3135 NLM_F_MULTI, NUD_PERMANENT); 3136 if (err < 0) 3137 return err; 3138 skip: 3139 *idx += 1; 3140 } 3141 return 0; 3142 } 3143 3144 /** 3145 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 3146 * @nlh: netlink message header 3147 * @dev: netdevice 3148 * 3149 * Default netdevice operation to dump the existing unicast address list. 3150 * Returns number of addresses from list put in skb. 3151 */ 3152 int ndo_dflt_fdb_dump(struct sk_buff *skb, 3153 struct netlink_callback *cb, 3154 struct net_device *dev, 3155 struct net_device *filter_dev, 3156 int *idx) 3157 { 3158 int err; 3159 3160 netif_addr_lock_bh(dev); 3161 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc); 3162 if (err) 3163 goto out; 3164 nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc); 3165 out: 3166 netif_addr_unlock_bh(dev); 3167 return err; 3168 } 3169 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 3170 3171 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 3172 { 3173 struct net_device *dev; 3174 struct nlattr *tb[IFLA_MAX+1]; 3175 struct net_device *br_dev = NULL; 3176 const struct net_device_ops *ops = NULL; 3177 const struct net_device_ops *cops = NULL; 3178 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 3179 struct net *net = sock_net(skb->sk); 3180 struct hlist_head *head; 3181 int brport_idx = 0; 3182 int br_idx = 0; 3183 int h, s_h; 3184 int idx = 0, s_idx; 3185 int err = 0; 3186 int fidx = 0; 3187 3188 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 3189 ifla_policy) == 0) { 3190 if (tb[IFLA_MASTER]) 3191 br_idx = nla_get_u32(tb[IFLA_MASTER]); 3192 } 3193 3194 brport_idx = ifm->ifi_index; 3195 3196 if (br_idx) { 3197 br_dev = __dev_get_by_index(net, br_idx); 3198 if (!br_dev) 3199 return -ENODEV; 3200 3201 ops = br_dev->netdev_ops; 3202 } 3203 3204 s_h = cb->args[0]; 3205 s_idx = cb->args[1]; 3206 3207 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3208 idx = 0; 3209 head = &net->dev_index_head[h]; 3210 hlist_for_each_entry(dev, head, index_hlist) { 3211 3212 if (brport_idx && (dev->ifindex != brport_idx)) 3213 continue; 3214 3215 if (!br_idx) { /* user did not specify a specific bridge */ 3216 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3217 br_dev = netdev_master_upper_dev_get(dev); 3218 cops = br_dev->netdev_ops; 3219 } 3220 } else { 3221 if (dev != br_dev && 3222 !(dev->priv_flags & IFF_BRIDGE_PORT)) 3223 continue; 3224 3225 if (br_dev != netdev_master_upper_dev_get(dev) && 3226 !(dev->priv_flags & IFF_EBRIDGE)) 3227 continue; 3228 cops = ops; 3229 } 3230 3231 if (idx < s_idx) 3232 goto cont; 3233 3234 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3235 if (cops && cops->ndo_fdb_dump) { 3236 err = cops->ndo_fdb_dump(skb, cb, 3237 br_dev, dev, 3238 &fidx); 3239 if (err == -EMSGSIZE) 3240 goto out; 3241 } 3242 } 3243 3244 if (dev->netdev_ops->ndo_fdb_dump) 3245 err = dev->netdev_ops->ndo_fdb_dump(skb, cb, 3246 dev, NULL, 3247 &fidx); 3248 else 3249 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, 3250 &fidx); 3251 if (err == -EMSGSIZE) 3252 goto out; 3253 3254 cops = NULL; 3255 3256 /* reset fdb offset to 0 for rest of the interfaces */ 3257 cb->args[2] = 0; 3258 fidx = 0; 3259 cont: 3260 idx++; 3261 } 3262 } 3263 3264 out: 3265 cb->args[0] = h; 3266 cb->args[1] = idx; 3267 cb->args[2] = fidx; 3268 3269 return skb->len; 3270 } 3271 3272 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 3273 unsigned int attrnum, unsigned int flag) 3274 { 3275 if (mask & flag) 3276 return nla_put_u8(skb, attrnum, !!(flags & flag)); 3277 return 0; 3278 } 3279 3280 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 3281 struct net_device *dev, u16 mode, 3282 u32 flags, u32 mask, int nlflags, 3283 u32 filter_mask, 3284 int (*vlan_fill)(struct sk_buff *skb, 3285 struct net_device *dev, 3286 u32 filter_mask)) 3287 { 3288 struct nlmsghdr *nlh; 3289 struct ifinfomsg *ifm; 3290 struct nlattr *br_afspec; 3291 struct nlattr *protinfo; 3292 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 3293 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3294 int err = 0; 3295 3296 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 3297 if (nlh == NULL) 3298 return -EMSGSIZE; 3299 3300 ifm = nlmsg_data(nlh); 3301 ifm->ifi_family = AF_BRIDGE; 3302 ifm->__ifi_pad = 0; 3303 ifm->ifi_type = dev->type; 3304 ifm->ifi_index = dev->ifindex; 3305 ifm->ifi_flags = dev_get_flags(dev); 3306 ifm->ifi_change = 0; 3307 3308 3309 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 3310 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 3311 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 3312 (br_dev && 3313 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 3314 (dev->addr_len && 3315 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 3316 (dev->ifindex != dev_get_iflink(dev) && 3317 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 3318 goto nla_put_failure; 3319 3320 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 3321 if (!br_afspec) 3322 goto nla_put_failure; 3323 3324 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 3325 nla_nest_cancel(skb, br_afspec); 3326 goto nla_put_failure; 3327 } 3328 3329 if (mode != BRIDGE_MODE_UNDEF) { 3330 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 3331 nla_nest_cancel(skb, br_afspec); 3332 goto nla_put_failure; 3333 } 3334 } 3335 if (vlan_fill) { 3336 err = vlan_fill(skb, dev, filter_mask); 3337 if (err) { 3338 nla_nest_cancel(skb, br_afspec); 3339 goto nla_put_failure; 3340 } 3341 } 3342 nla_nest_end(skb, br_afspec); 3343 3344 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 3345 if (!protinfo) 3346 goto nla_put_failure; 3347 3348 if (brport_nla_put_flag(skb, flags, mask, 3349 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 3350 brport_nla_put_flag(skb, flags, mask, 3351 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 3352 brport_nla_put_flag(skb, flags, mask, 3353 IFLA_BRPORT_FAST_LEAVE, 3354 BR_MULTICAST_FAST_LEAVE) || 3355 brport_nla_put_flag(skb, flags, mask, 3356 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 3357 brport_nla_put_flag(skb, flags, mask, 3358 IFLA_BRPORT_LEARNING, BR_LEARNING) || 3359 brport_nla_put_flag(skb, flags, mask, 3360 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 3361 brport_nla_put_flag(skb, flags, mask, 3362 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3363 brport_nla_put_flag(skb, flags, mask, 3364 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3365 nla_nest_cancel(skb, protinfo); 3366 goto nla_put_failure; 3367 } 3368 3369 nla_nest_end(skb, protinfo); 3370 3371 nlmsg_end(skb, nlh); 3372 return 0; 3373 nla_put_failure: 3374 nlmsg_cancel(skb, nlh); 3375 return err ? err : -EMSGSIZE; 3376 } 3377 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3378 3379 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3380 { 3381 struct net *net = sock_net(skb->sk); 3382 struct net_device *dev; 3383 int idx = 0; 3384 u32 portid = NETLINK_CB(cb->skb).portid; 3385 u32 seq = cb->nlh->nlmsg_seq; 3386 u32 filter_mask = 0; 3387 int err; 3388 3389 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3390 struct nlattr *extfilt; 3391 3392 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3393 IFLA_EXT_MASK); 3394 if (extfilt) { 3395 if (nla_len(extfilt) < sizeof(filter_mask)) 3396 return -EINVAL; 3397 3398 filter_mask = nla_get_u32(extfilt); 3399 } 3400 } 3401 3402 rcu_read_lock(); 3403 for_each_netdev_rcu(net, dev) { 3404 const struct net_device_ops *ops = dev->netdev_ops; 3405 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3406 3407 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3408 if (idx >= cb->args[0]) { 3409 err = br_dev->netdev_ops->ndo_bridge_getlink( 3410 skb, portid, seq, dev, 3411 filter_mask, NLM_F_MULTI); 3412 if (err < 0 && err != -EOPNOTSUPP) 3413 break; 3414 } 3415 idx++; 3416 } 3417 3418 if (ops->ndo_bridge_getlink) { 3419 if (idx >= cb->args[0]) { 3420 err = ops->ndo_bridge_getlink(skb, portid, 3421 seq, dev, 3422 filter_mask, 3423 NLM_F_MULTI); 3424 if (err < 0 && err != -EOPNOTSUPP) 3425 break; 3426 } 3427 idx++; 3428 } 3429 } 3430 rcu_read_unlock(); 3431 cb->args[0] = idx; 3432 3433 return skb->len; 3434 } 3435 3436 static inline size_t bridge_nlmsg_size(void) 3437 { 3438 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3439 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3440 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3441 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3442 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3443 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3444 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3445 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3446 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3447 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3448 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3449 } 3450 3451 static int rtnl_bridge_notify(struct net_device *dev) 3452 { 3453 struct net *net = dev_net(dev); 3454 struct sk_buff *skb; 3455 int err = -EOPNOTSUPP; 3456 3457 if (!dev->netdev_ops->ndo_bridge_getlink) 3458 return 0; 3459 3460 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3461 if (!skb) { 3462 err = -ENOMEM; 3463 goto errout; 3464 } 3465 3466 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3467 if (err < 0) 3468 goto errout; 3469 3470 if (!skb->len) 3471 goto errout; 3472 3473 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3474 return 0; 3475 errout: 3476 WARN_ON(err == -EMSGSIZE); 3477 kfree_skb(skb); 3478 if (err) 3479 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3480 return err; 3481 } 3482 3483 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3484 { 3485 struct net *net = sock_net(skb->sk); 3486 struct ifinfomsg *ifm; 3487 struct net_device *dev; 3488 struct nlattr *br_spec, *attr = NULL; 3489 int rem, err = -EOPNOTSUPP; 3490 u16 flags = 0; 3491 bool have_flags = false; 3492 3493 if (nlmsg_len(nlh) < sizeof(*ifm)) 3494 return -EINVAL; 3495 3496 ifm = nlmsg_data(nlh); 3497 if (ifm->ifi_family != AF_BRIDGE) 3498 return -EPFNOSUPPORT; 3499 3500 dev = __dev_get_by_index(net, ifm->ifi_index); 3501 if (!dev) { 3502 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3503 return -ENODEV; 3504 } 3505 3506 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3507 if (br_spec) { 3508 nla_for_each_nested(attr, br_spec, rem) { 3509 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3510 if (nla_len(attr) < sizeof(flags)) 3511 return -EINVAL; 3512 3513 have_flags = true; 3514 flags = nla_get_u16(attr); 3515 break; 3516 } 3517 } 3518 } 3519 3520 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3521 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3522 3523 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3524 err = -EOPNOTSUPP; 3525 goto out; 3526 } 3527 3528 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3529 if (err) 3530 goto out; 3531 3532 flags &= ~BRIDGE_FLAGS_MASTER; 3533 } 3534 3535 if ((flags & BRIDGE_FLAGS_SELF)) { 3536 if (!dev->netdev_ops->ndo_bridge_setlink) 3537 err = -EOPNOTSUPP; 3538 else 3539 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3540 flags); 3541 if (!err) { 3542 flags &= ~BRIDGE_FLAGS_SELF; 3543 3544 /* Generate event to notify upper layer of bridge 3545 * change 3546 */ 3547 err = rtnl_bridge_notify(dev); 3548 } 3549 } 3550 3551 if (have_flags) 3552 memcpy(nla_data(attr), &flags, sizeof(flags)); 3553 out: 3554 return err; 3555 } 3556 3557 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3558 { 3559 struct net *net = sock_net(skb->sk); 3560 struct ifinfomsg *ifm; 3561 struct net_device *dev; 3562 struct nlattr *br_spec, *attr = NULL; 3563 int rem, err = -EOPNOTSUPP; 3564 u16 flags = 0; 3565 bool have_flags = false; 3566 3567 if (nlmsg_len(nlh) < sizeof(*ifm)) 3568 return -EINVAL; 3569 3570 ifm = nlmsg_data(nlh); 3571 if (ifm->ifi_family != AF_BRIDGE) 3572 return -EPFNOSUPPORT; 3573 3574 dev = __dev_get_by_index(net, ifm->ifi_index); 3575 if (!dev) { 3576 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3577 return -ENODEV; 3578 } 3579 3580 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3581 if (br_spec) { 3582 nla_for_each_nested(attr, br_spec, rem) { 3583 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3584 if (nla_len(attr) < sizeof(flags)) 3585 return -EINVAL; 3586 3587 have_flags = true; 3588 flags = nla_get_u16(attr); 3589 break; 3590 } 3591 } 3592 } 3593 3594 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3595 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3596 3597 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3598 err = -EOPNOTSUPP; 3599 goto out; 3600 } 3601 3602 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3603 if (err) 3604 goto out; 3605 3606 flags &= ~BRIDGE_FLAGS_MASTER; 3607 } 3608 3609 if ((flags & BRIDGE_FLAGS_SELF)) { 3610 if (!dev->netdev_ops->ndo_bridge_dellink) 3611 err = -EOPNOTSUPP; 3612 else 3613 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3614 flags); 3615 3616 if (!err) { 3617 flags &= ~BRIDGE_FLAGS_SELF; 3618 3619 /* Generate event to notify upper layer of bridge 3620 * change 3621 */ 3622 err = rtnl_bridge_notify(dev); 3623 } 3624 } 3625 3626 if (have_flags) 3627 memcpy(nla_data(attr), &flags, sizeof(flags)); 3628 out: 3629 return err; 3630 } 3631 3632 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr) 3633 { 3634 return (mask & IFLA_STATS_FILTER_BIT(attrid)) && 3635 (!idxattr || idxattr == attrid); 3636 } 3637 3638 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1) 3639 static int rtnl_get_offload_stats_attr_size(int attr_id) 3640 { 3641 switch (attr_id) { 3642 case IFLA_OFFLOAD_XSTATS_CPU_HIT: 3643 return sizeof(struct rtnl_link_stats64); 3644 } 3645 3646 return 0; 3647 } 3648 3649 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev, 3650 int *prividx) 3651 { 3652 struct nlattr *attr = NULL; 3653 int attr_id, size; 3654 void *attr_data; 3655 int err; 3656 3657 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 3658 dev->netdev_ops->ndo_get_offload_stats)) 3659 return -ENODATA; 3660 3661 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 3662 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 3663 if (attr_id < *prividx) 3664 continue; 3665 3666 size = rtnl_get_offload_stats_attr_size(attr_id); 3667 if (!size) 3668 continue; 3669 3670 if (!dev->netdev_ops->ndo_has_offload_stats(attr_id)) 3671 continue; 3672 3673 attr = nla_reserve_64bit(skb, attr_id, size, 3674 IFLA_OFFLOAD_XSTATS_UNSPEC); 3675 if (!attr) 3676 goto nla_put_failure; 3677 3678 attr_data = nla_data(attr); 3679 memset(attr_data, 0, size); 3680 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, 3681 attr_data); 3682 if (err) 3683 goto get_offload_stats_failure; 3684 } 3685 3686 if (!attr) 3687 return -ENODATA; 3688 3689 *prividx = 0; 3690 return 0; 3691 3692 nla_put_failure: 3693 err = -EMSGSIZE; 3694 get_offload_stats_failure: 3695 *prividx = attr_id; 3696 return err; 3697 } 3698 3699 static int rtnl_get_offload_stats_size(const struct net_device *dev) 3700 { 3701 int nla_size = 0; 3702 int attr_id; 3703 int size; 3704 3705 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 3706 dev->netdev_ops->ndo_get_offload_stats)) 3707 return 0; 3708 3709 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 3710 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 3711 if (!dev->netdev_ops->ndo_has_offload_stats(attr_id)) 3712 continue; 3713 size = rtnl_get_offload_stats_attr_size(attr_id); 3714 nla_size += nla_total_size_64bit(size); 3715 } 3716 3717 if (nla_size != 0) 3718 nla_size += nla_total_size(0); 3719 3720 return nla_size; 3721 } 3722 3723 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, 3724 int type, u32 pid, u32 seq, u32 change, 3725 unsigned int flags, unsigned int filter_mask, 3726 int *idxattr, int *prividx) 3727 { 3728 struct if_stats_msg *ifsm; 3729 struct nlmsghdr *nlh; 3730 struct nlattr *attr; 3731 int s_prividx = *prividx; 3732 int err; 3733 3734 ASSERT_RTNL(); 3735 3736 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags); 3737 if (!nlh) 3738 return -EMSGSIZE; 3739 3740 ifsm = nlmsg_data(nlh); 3741 ifsm->ifindex = dev->ifindex; 3742 ifsm->filter_mask = filter_mask; 3743 3744 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) { 3745 struct rtnl_link_stats64 *sp; 3746 3747 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64, 3748 sizeof(struct rtnl_link_stats64), 3749 IFLA_STATS_UNSPEC); 3750 if (!attr) 3751 goto nla_put_failure; 3752 3753 sp = nla_data(attr); 3754 dev_get_stats(dev, sp); 3755 } 3756 3757 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) { 3758 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 3759 3760 if (ops && ops->fill_linkxstats) { 3761 *idxattr = IFLA_STATS_LINK_XSTATS; 3762 attr = nla_nest_start(skb, 3763 IFLA_STATS_LINK_XSTATS); 3764 if (!attr) 3765 goto nla_put_failure; 3766 3767 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 3768 nla_nest_end(skb, attr); 3769 if (err) 3770 goto nla_put_failure; 3771 *idxattr = 0; 3772 } 3773 } 3774 3775 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 3776 *idxattr)) { 3777 const struct rtnl_link_ops *ops = NULL; 3778 const struct net_device *master; 3779 3780 master = netdev_master_upper_dev_get(dev); 3781 if (master) 3782 ops = master->rtnl_link_ops; 3783 if (ops && ops->fill_linkxstats) { 3784 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE; 3785 attr = nla_nest_start(skb, 3786 IFLA_STATS_LINK_XSTATS_SLAVE); 3787 if (!attr) 3788 goto nla_put_failure; 3789 3790 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 3791 nla_nest_end(skb, attr); 3792 if (err) 3793 goto nla_put_failure; 3794 *idxattr = 0; 3795 } 3796 } 3797 3798 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 3799 *idxattr)) { 3800 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS; 3801 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS); 3802 if (!attr) 3803 goto nla_put_failure; 3804 3805 err = rtnl_get_offload_stats(skb, dev, prividx); 3806 if (err == -ENODATA) 3807 nla_nest_cancel(skb, attr); 3808 else 3809 nla_nest_end(skb, attr); 3810 3811 if (err && err != -ENODATA) 3812 goto nla_put_failure; 3813 *idxattr = 0; 3814 } 3815 3816 nlmsg_end(skb, nlh); 3817 3818 return 0; 3819 3820 nla_put_failure: 3821 /* not a multi message or no progress mean a real error */ 3822 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx) 3823 nlmsg_cancel(skb, nlh); 3824 else 3825 nlmsg_end(skb, nlh); 3826 3827 return -EMSGSIZE; 3828 } 3829 3830 static size_t if_nlmsg_stats_size(const struct net_device *dev, 3831 u32 filter_mask) 3832 { 3833 size_t size = 0; 3834 3835 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0)) 3836 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64)); 3837 3838 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) { 3839 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 3840 int attr = IFLA_STATS_LINK_XSTATS; 3841 3842 if (ops && ops->get_linkxstats_size) { 3843 size += nla_total_size(ops->get_linkxstats_size(dev, 3844 attr)); 3845 /* for IFLA_STATS_LINK_XSTATS */ 3846 size += nla_total_size(0); 3847 } 3848 } 3849 3850 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) { 3851 struct net_device *_dev = (struct net_device *)dev; 3852 const struct rtnl_link_ops *ops = NULL; 3853 const struct net_device *master; 3854 3855 /* netdev_master_upper_dev_get can't take const */ 3856 master = netdev_master_upper_dev_get(_dev); 3857 if (master) 3858 ops = master->rtnl_link_ops; 3859 if (ops && ops->get_linkxstats_size) { 3860 int attr = IFLA_STATS_LINK_XSTATS_SLAVE; 3861 3862 size += nla_total_size(ops->get_linkxstats_size(dev, 3863 attr)); 3864 /* for IFLA_STATS_LINK_XSTATS_SLAVE */ 3865 size += nla_total_size(0); 3866 } 3867 } 3868 3869 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) 3870 size += rtnl_get_offload_stats_size(dev); 3871 3872 return size; 3873 } 3874 3875 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh) 3876 { 3877 struct net *net = sock_net(skb->sk); 3878 struct net_device *dev = NULL; 3879 int idxattr = 0, prividx = 0; 3880 struct if_stats_msg *ifsm; 3881 struct sk_buff *nskb; 3882 u32 filter_mask; 3883 int err; 3884 3885 ifsm = nlmsg_data(nlh); 3886 if (ifsm->ifindex > 0) 3887 dev = __dev_get_by_index(net, ifsm->ifindex); 3888 else 3889 return -EINVAL; 3890 3891 if (!dev) 3892 return -ENODEV; 3893 3894 filter_mask = ifsm->filter_mask; 3895 if (!filter_mask) 3896 return -EINVAL; 3897 3898 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL); 3899 if (!nskb) 3900 return -ENOBUFS; 3901 3902 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS, 3903 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 3904 0, filter_mask, &idxattr, &prividx); 3905 if (err < 0) { 3906 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */ 3907 WARN_ON(err == -EMSGSIZE); 3908 kfree_skb(nskb); 3909 } else { 3910 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 3911 } 3912 3913 return err; 3914 } 3915 3916 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb) 3917 { 3918 int h, s_h, err, s_idx, s_idxattr, s_prividx; 3919 struct net *net = sock_net(skb->sk); 3920 unsigned int flags = NLM_F_MULTI; 3921 struct if_stats_msg *ifsm; 3922 struct hlist_head *head; 3923 struct net_device *dev; 3924 u32 filter_mask = 0; 3925 int idx = 0; 3926 3927 s_h = cb->args[0]; 3928 s_idx = cb->args[1]; 3929 s_idxattr = cb->args[2]; 3930 s_prividx = cb->args[3]; 3931 3932 cb->seq = net->dev_base_seq; 3933 3934 ifsm = nlmsg_data(cb->nlh); 3935 filter_mask = ifsm->filter_mask; 3936 if (!filter_mask) 3937 return -EINVAL; 3938 3939 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3940 idx = 0; 3941 head = &net->dev_index_head[h]; 3942 hlist_for_each_entry(dev, head, index_hlist) { 3943 if (idx < s_idx) 3944 goto cont; 3945 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 3946 NETLINK_CB(cb->skb).portid, 3947 cb->nlh->nlmsg_seq, 0, 3948 flags, filter_mask, 3949 &s_idxattr, &s_prividx); 3950 /* If we ran out of room on the first message, 3951 * we're in trouble 3952 */ 3953 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 3954 3955 if (err < 0) 3956 goto out; 3957 s_prividx = 0; 3958 s_idxattr = 0; 3959 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3960 cont: 3961 idx++; 3962 } 3963 } 3964 out: 3965 cb->args[3] = s_prividx; 3966 cb->args[2] = s_idxattr; 3967 cb->args[1] = idx; 3968 cb->args[0] = h; 3969 3970 return skb->len; 3971 } 3972 3973 /* Process one rtnetlink message. */ 3974 3975 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3976 { 3977 struct net *net = sock_net(skb->sk); 3978 rtnl_doit_func doit; 3979 int kind; 3980 int family; 3981 int type; 3982 int err; 3983 3984 type = nlh->nlmsg_type; 3985 if (type > RTM_MAX) 3986 return -EOPNOTSUPP; 3987 3988 type -= RTM_BASE; 3989 3990 /* All the messages must have at least 1 byte length */ 3991 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3992 return 0; 3993 3994 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3995 kind = type&3; 3996 3997 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3998 return -EPERM; 3999 4000 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 4001 struct sock *rtnl; 4002 rtnl_dumpit_func dumpit; 4003 rtnl_calcit_func calcit; 4004 u16 min_dump_alloc = 0; 4005 4006 dumpit = rtnl_get_dumpit(family, type); 4007 if (dumpit == NULL) 4008 return -EOPNOTSUPP; 4009 calcit = rtnl_get_calcit(family, type); 4010 if (calcit) 4011 min_dump_alloc = calcit(skb, nlh); 4012 4013 __rtnl_unlock(); 4014 rtnl = net->rtnl; 4015 { 4016 struct netlink_dump_control c = { 4017 .dump = dumpit, 4018 .min_dump_alloc = min_dump_alloc, 4019 }; 4020 err = netlink_dump_start(rtnl, skb, nlh, &c); 4021 } 4022 rtnl_lock(); 4023 return err; 4024 } 4025 4026 doit = rtnl_get_doit(family, type); 4027 if (doit == NULL) 4028 return -EOPNOTSUPP; 4029 4030 return doit(skb, nlh); 4031 } 4032 4033 static void rtnetlink_rcv(struct sk_buff *skb) 4034 { 4035 rtnl_lock(); 4036 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 4037 rtnl_unlock(); 4038 } 4039 4040 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 4041 { 4042 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4043 4044 switch (event) { 4045 case NETDEV_UP: 4046 case NETDEV_DOWN: 4047 case NETDEV_PRE_UP: 4048 case NETDEV_POST_INIT: 4049 case NETDEV_REGISTER: 4050 case NETDEV_CHANGE: 4051 case NETDEV_PRE_TYPE_CHANGE: 4052 case NETDEV_GOING_DOWN: 4053 case NETDEV_UNREGISTER: 4054 case NETDEV_UNREGISTER_FINAL: 4055 case NETDEV_RELEASE: 4056 case NETDEV_JOIN: 4057 case NETDEV_BONDING_INFO: 4058 break; 4059 default: 4060 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 4061 break; 4062 } 4063 return NOTIFY_DONE; 4064 } 4065 4066 static struct notifier_block rtnetlink_dev_notifier = { 4067 .notifier_call = rtnetlink_event, 4068 }; 4069 4070 4071 static int __net_init rtnetlink_net_init(struct net *net) 4072 { 4073 struct sock *sk; 4074 struct netlink_kernel_cfg cfg = { 4075 .groups = RTNLGRP_MAX, 4076 .input = rtnetlink_rcv, 4077 .cb_mutex = &rtnl_mutex, 4078 .flags = NL_CFG_F_NONROOT_RECV, 4079 }; 4080 4081 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 4082 if (!sk) 4083 return -ENOMEM; 4084 net->rtnl = sk; 4085 return 0; 4086 } 4087 4088 static void __net_exit rtnetlink_net_exit(struct net *net) 4089 { 4090 netlink_kernel_release(net->rtnl); 4091 net->rtnl = NULL; 4092 } 4093 4094 static struct pernet_operations rtnetlink_net_ops = { 4095 .init = rtnetlink_net_init, 4096 .exit = rtnetlink_net_exit, 4097 }; 4098 4099 void __init rtnetlink_init(void) 4100 { 4101 if (register_pernet_subsys(&rtnetlink_net_ops)) 4102 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 4103 4104 register_netdevice_notifier(&rtnetlink_dev_notifier); 4105 4106 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 4107 rtnl_dump_ifinfo, rtnl_calcit); 4108 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 4109 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 4110 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 4111 4112 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 4113 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 4114 4115 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 4116 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 4117 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 4118 4119 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 4120 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 4121 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 4122 4123 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump, 4124 NULL); 4125 } 4126