1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/slab.h> 31 #include <linux/interrupt.h> 32 #include <linux/capability.h> 33 #include <linux/skbuff.h> 34 #include <linux/init.h> 35 #include <linux/security.h> 36 #include <linux/mutex.h> 37 #include <linux/if_addr.h> 38 #include <linux/if_bridge.h> 39 #include <linux/if_vlan.h> 40 #include <linux/pci.h> 41 #include <linux/etherdevice.h> 42 43 #include <linux/uaccess.h> 44 45 #include <linux/inet.h> 46 #include <linux/netdevice.h> 47 #include <net/switchdev.h> 48 #include <net/ip.h> 49 #include <net/protocol.h> 50 #include <net/arp.h> 51 #include <net/route.h> 52 #include <net/udp.h> 53 #include <net/tcp.h> 54 #include <net/sock.h> 55 #include <net/pkt_sched.h> 56 #include <net/fib_rules.h> 57 #include <net/rtnetlink.h> 58 #include <net/net_namespace.h> 59 60 struct rtnl_link { 61 rtnl_doit_func doit; 62 rtnl_dumpit_func dumpit; 63 rtnl_calcit_func calcit; 64 }; 65 66 static DEFINE_MUTEX(rtnl_mutex); 67 68 void rtnl_lock(void) 69 { 70 mutex_lock(&rtnl_mutex); 71 } 72 EXPORT_SYMBOL(rtnl_lock); 73 74 static struct sk_buff *defer_kfree_skb_list; 75 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail) 76 { 77 if (head && tail) { 78 tail->next = defer_kfree_skb_list; 79 defer_kfree_skb_list = head; 80 } 81 } 82 EXPORT_SYMBOL(rtnl_kfree_skbs); 83 84 void __rtnl_unlock(void) 85 { 86 struct sk_buff *head = defer_kfree_skb_list; 87 88 defer_kfree_skb_list = NULL; 89 90 mutex_unlock(&rtnl_mutex); 91 92 while (head) { 93 struct sk_buff *next = head->next; 94 95 kfree_skb(head); 96 cond_resched(); 97 head = next; 98 } 99 } 100 101 void rtnl_unlock(void) 102 { 103 /* This fellow will unlock it for us. */ 104 netdev_run_todo(); 105 } 106 EXPORT_SYMBOL(rtnl_unlock); 107 108 int rtnl_trylock(void) 109 { 110 return mutex_trylock(&rtnl_mutex); 111 } 112 EXPORT_SYMBOL(rtnl_trylock); 113 114 int rtnl_is_locked(void) 115 { 116 return mutex_is_locked(&rtnl_mutex); 117 } 118 EXPORT_SYMBOL(rtnl_is_locked); 119 120 #ifdef CONFIG_PROVE_LOCKING 121 bool lockdep_rtnl_is_held(void) 122 { 123 return lockdep_is_held(&rtnl_mutex); 124 } 125 EXPORT_SYMBOL(lockdep_rtnl_is_held); 126 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 127 128 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 129 130 static inline int rtm_msgindex(int msgtype) 131 { 132 int msgindex = msgtype - RTM_BASE; 133 134 /* 135 * msgindex < 0 implies someone tried to register a netlink 136 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 137 * the message type has not been added to linux/rtnetlink.h 138 */ 139 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 140 141 return msgindex; 142 } 143 144 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 145 { 146 struct rtnl_link *tab; 147 148 if (protocol <= RTNL_FAMILY_MAX) 149 tab = rtnl_msg_handlers[protocol]; 150 else 151 tab = NULL; 152 153 if (tab == NULL || tab[msgindex].doit == NULL) 154 tab = rtnl_msg_handlers[PF_UNSPEC]; 155 156 return tab[msgindex].doit; 157 } 158 159 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 160 { 161 struct rtnl_link *tab; 162 163 if (protocol <= RTNL_FAMILY_MAX) 164 tab = rtnl_msg_handlers[protocol]; 165 else 166 tab = NULL; 167 168 if (tab == NULL || tab[msgindex].dumpit == NULL) 169 tab = rtnl_msg_handlers[PF_UNSPEC]; 170 171 return tab[msgindex].dumpit; 172 } 173 174 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 175 { 176 struct rtnl_link *tab; 177 178 if (protocol <= RTNL_FAMILY_MAX) 179 tab = rtnl_msg_handlers[protocol]; 180 else 181 tab = NULL; 182 183 if (tab == NULL || tab[msgindex].calcit == NULL) 184 tab = rtnl_msg_handlers[PF_UNSPEC]; 185 186 return tab[msgindex].calcit; 187 } 188 189 /** 190 * __rtnl_register - Register a rtnetlink message type 191 * @protocol: Protocol family or PF_UNSPEC 192 * @msgtype: rtnetlink message type 193 * @doit: Function pointer called for each request message 194 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 195 * @calcit: Function pointer to calc size of dump message 196 * 197 * Registers the specified function pointers (at least one of them has 198 * to be non-NULL) to be called whenever a request message for the 199 * specified protocol family and message type is received. 200 * 201 * The special protocol family PF_UNSPEC may be used to define fallback 202 * function pointers for the case when no entry for the specific protocol 203 * family exists. 204 * 205 * Returns 0 on success or a negative error code. 206 */ 207 int __rtnl_register(int protocol, int msgtype, 208 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 209 rtnl_calcit_func calcit) 210 { 211 struct rtnl_link *tab; 212 int msgindex; 213 214 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 215 msgindex = rtm_msgindex(msgtype); 216 217 tab = rtnl_msg_handlers[protocol]; 218 if (tab == NULL) { 219 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 220 if (tab == NULL) 221 return -ENOBUFS; 222 223 rtnl_msg_handlers[protocol] = tab; 224 } 225 226 if (doit) 227 tab[msgindex].doit = doit; 228 229 if (dumpit) 230 tab[msgindex].dumpit = dumpit; 231 232 if (calcit) 233 tab[msgindex].calcit = calcit; 234 235 return 0; 236 } 237 EXPORT_SYMBOL_GPL(__rtnl_register); 238 239 /** 240 * rtnl_register - Register a rtnetlink message type 241 * 242 * Identical to __rtnl_register() but panics on failure. This is useful 243 * as failure of this function is very unlikely, it can only happen due 244 * to lack of memory when allocating the chain to store all message 245 * handlers for a protocol. Meant for use in init functions where lack 246 * of memory implies no sense in continuing. 247 */ 248 void rtnl_register(int protocol, int msgtype, 249 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 250 rtnl_calcit_func calcit) 251 { 252 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 253 panic("Unable to register rtnetlink message handler, " 254 "protocol = %d, message type = %d\n", 255 protocol, msgtype); 256 } 257 EXPORT_SYMBOL_GPL(rtnl_register); 258 259 /** 260 * rtnl_unregister - Unregister a rtnetlink message type 261 * @protocol: Protocol family or PF_UNSPEC 262 * @msgtype: rtnetlink message type 263 * 264 * Returns 0 on success or a negative error code. 265 */ 266 int rtnl_unregister(int protocol, int msgtype) 267 { 268 int msgindex; 269 270 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 271 msgindex = rtm_msgindex(msgtype); 272 273 if (rtnl_msg_handlers[protocol] == NULL) 274 return -ENOENT; 275 276 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 277 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 278 rtnl_msg_handlers[protocol][msgindex].calcit = NULL; 279 280 return 0; 281 } 282 EXPORT_SYMBOL_GPL(rtnl_unregister); 283 284 /** 285 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 286 * @protocol : Protocol family or PF_UNSPEC 287 * 288 * Identical to calling rtnl_unregster() for all registered message types 289 * of a certain protocol family. 290 */ 291 void rtnl_unregister_all(int protocol) 292 { 293 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 294 295 kfree(rtnl_msg_handlers[protocol]); 296 rtnl_msg_handlers[protocol] = NULL; 297 } 298 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 299 300 static LIST_HEAD(link_ops); 301 302 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 303 { 304 const struct rtnl_link_ops *ops; 305 306 list_for_each_entry(ops, &link_ops, list) { 307 if (!strcmp(ops->kind, kind)) 308 return ops; 309 } 310 return NULL; 311 } 312 313 /** 314 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 315 * @ops: struct rtnl_link_ops * to register 316 * 317 * The caller must hold the rtnl_mutex. This function should be used 318 * by drivers that create devices during module initialization. It 319 * must be called before registering the devices. 320 * 321 * Returns 0 on success or a negative error code. 322 */ 323 int __rtnl_link_register(struct rtnl_link_ops *ops) 324 { 325 if (rtnl_link_ops_get(ops->kind)) 326 return -EEXIST; 327 328 /* The check for setup is here because if ops 329 * does not have that filled up, it is not possible 330 * to use the ops for creating device. So do not 331 * fill up dellink as well. That disables rtnl_dellink. 332 */ 333 if (ops->setup && !ops->dellink) 334 ops->dellink = unregister_netdevice_queue; 335 336 list_add_tail(&ops->list, &link_ops); 337 return 0; 338 } 339 EXPORT_SYMBOL_GPL(__rtnl_link_register); 340 341 /** 342 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 343 * @ops: struct rtnl_link_ops * to register 344 * 345 * Returns 0 on success or a negative error code. 346 */ 347 int rtnl_link_register(struct rtnl_link_ops *ops) 348 { 349 int err; 350 351 rtnl_lock(); 352 err = __rtnl_link_register(ops); 353 rtnl_unlock(); 354 return err; 355 } 356 EXPORT_SYMBOL_GPL(rtnl_link_register); 357 358 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 359 { 360 struct net_device *dev; 361 LIST_HEAD(list_kill); 362 363 for_each_netdev(net, dev) { 364 if (dev->rtnl_link_ops == ops) 365 ops->dellink(dev, &list_kill); 366 } 367 unregister_netdevice_many(&list_kill); 368 } 369 370 /** 371 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 372 * @ops: struct rtnl_link_ops * to unregister 373 * 374 * The caller must hold the rtnl_mutex. 375 */ 376 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 377 { 378 struct net *net; 379 380 for_each_net(net) { 381 __rtnl_kill_links(net, ops); 382 } 383 list_del(&ops->list); 384 } 385 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 386 387 /* Return with the rtnl_lock held when there are no network 388 * devices unregistering in any network namespace. 389 */ 390 static void rtnl_lock_unregistering_all(void) 391 { 392 struct net *net; 393 bool unregistering; 394 DEFINE_WAIT_FUNC(wait, woken_wake_function); 395 396 add_wait_queue(&netdev_unregistering_wq, &wait); 397 for (;;) { 398 unregistering = false; 399 rtnl_lock(); 400 for_each_net(net) { 401 if (net->dev_unreg_count > 0) { 402 unregistering = true; 403 break; 404 } 405 } 406 if (!unregistering) 407 break; 408 __rtnl_unlock(); 409 410 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 411 } 412 remove_wait_queue(&netdev_unregistering_wq, &wait); 413 } 414 415 /** 416 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 417 * @ops: struct rtnl_link_ops * to unregister 418 */ 419 void rtnl_link_unregister(struct rtnl_link_ops *ops) 420 { 421 /* Close the race with cleanup_net() */ 422 mutex_lock(&net_mutex); 423 rtnl_lock_unregistering_all(); 424 __rtnl_link_unregister(ops); 425 rtnl_unlock(); 426 mutex_unlock(&net_mutex); 427 } 428 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 429 430 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 431 { 432 struct net_device *master_dev; 433 const struct rtnl_link_ops *ops; 434 435 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 436 if (!master_dev) 437 return 0; 438 ops = master_dev->rtnl_link_ops; 439 if (!ops || !ops->get_slave_size) 440 return 0; 441 /* IFLA_INFO_SLAVE_DATA + nested data */ 442 return nla_total_size(sizeof(struct nlattr)) + 443 ops->get_slave_size(master_dev, dev); 444 } 445 446 static size_t rtnl_link_get_size(const struct net_device *dev) 447 { 448 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 449 size_t size; 450 451 if (!ops) 452 return 0; 453 454 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 455 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 456 457 if (ops->get_size) 458 /* IFLA_INFO_DATA + nested data */ 459 size += nla_total_size(sizeof(struct nlattr)) + 460 ops->get_size(dev); 461 462 if (ops->get_xstats_size) 463 /* IFLA_INFO_XSTATS */ 464 size += nla_total_size(ops->get_xstats_size(dev)); 465 466 size += rtnl_link_get_slave_info_data_size(dev); 467 468 return size; 469 } 470 471 static LIST_HEAD(rtnl_af_ops); 472 473 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 474 { 475 const struct rtnl_af_ops *ops; 476 477 list_for_each_entry(ops, &rtnl_af_ops, list) { 478 if (ops->family == family) 479 return ops; 480 } 481 482 return NULL; 483 } 484 485 /** 486 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 487 * @ops: struct rtnl_af_ops * to register 488 * 489 * Returns 0 on success or a negative error code. 490 */ 491 void rtnl_af_register(struct rtnl_af_ops *ops) 492 { 493 rtnl_lock(); 494 list_add_tail(&ops->list, &rtnl_af_ops); 495 rtnl_unlock(); 496 } 497 EXPORT_SYMBOL_GPL(rtnl_af_register); 498 499 /** 500 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 501 * @ops: struct rtnl_af_ops * to unregister 502 * 503 * The caller must hold the rtnl_mutex. 504 */ 505 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 506 { 507 list_del(&ops->list); 508 } 509 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 510 511 /** 512 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 513 * @ops: struct rtnl_af_ops * to unregister 514 */ 515 void rtnl_af_unregister(struct rtnl_af_ops *ops) 516 { 517 rtnl_lock(); 518 __rtnl_af_unregister(ops); 519 rtnl_unlock(); 520 } 521 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 522 523 static size_t rtnl_link_get_af_size(const struct net_device *dev, 524 u32 ext_filter_mask) 525 { 526 struct rtnl_af_ops *af_ops; 527 size_t size; 528 529 /* IFLA_AF_SPEC */ 530 size = nla_total_size(sizeof(struct nlattr)); 531 532 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 533 if (af_ops->get_link_af_size) { 534 /* AF_* + nested data */ 535 size += nla_total_size(sizeof(struct nlattr)) + 536 af_ops->get_link_af_size(dev, ext_filter_mask); 537 } 538 } 539 540 return size; 541 } 542 543 static bool rtnl_have_link_slave_info(const struct net_device *dev) 544 { 545 struct net_device *master_dev; 546 547 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 548 if (master_dev && master_dev->rtnl_link_ops) 549 return true; 550 return false; 551 } 552 553 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 554 const struct net_device *dev) 555 { 556 struct net_device *master_dev; 557 const struct rtnl_link_ops *ops; 558 struct nlattr *slave_data; 559 int err; 560 561 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 562 if (!master_dev) 563 return 0; 564 ops = master_dev->rtnl_link_ops; 565 if (!ops) 566 return 0; 567 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 568 return -EMSGSIZE; 569 if (ops->fill_slave_info) { 570 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA); 571 if (!slave_data) 572 return -EMSGSIZE; 573 err = ops->fill_slave_info(skb, master_dev, dev); 574 if (err < 0) 575 goto err_cancel_slave_data; 576 nla_nest_end(skb, slave_data); 577 } 578 return 0; 579 580 err_cancel_slave_data: 581 nla_nest_cancel(skb, slave_data); 582 return err; 583 } 584 585 static int rtnl_link_info_fill(struct sk_buff *skb, 586 const struct net_device *dev) 587 { 588 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 589 struct nlattr *data; 590 int err; 591 592 if (!ops) 593 return 0; 594 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 595 return -EMSGSIZE; 596 if (ops->fill_xstats) { 597 err = ops->fill_xstats(skb, dev); 598 if (err < 0) 599 return err; 600 } 601 if (ops->fill_info) { 602 data = nla_nest_start(skb, IFLA_INFO_DATA); 603 if (data == NULL) 604 return -EMSGSIZE; 605 err = ops->fill_info(skb, dev); 606 if (err < 0) 607 goto err_cancel_data; 608 nla_nest_end(skb, data); 609 } 610 return 0; 611 612 err_cancel_data: 613 nla_nest_cancel(skb, data); 614 return err; 615 } 616 617 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 618 { 619 struct nlattr *linkinfo; 620 int err = -EMSGSIZE; 621 622 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 623 if (linkinfo == NULL) 624 goto out; 625 626 err = rtnl_link_info_fill(skb, dev); 627 if (err < 0) 628 goto err_cancel_link; 629 630 err = rtnl_link_slave_info_fill(skb, dev); 631 if (err < 0) 632 goto err_cancel_link; 633 634 nla_nest_end(skb, linkinfo); 635 return 0; 636 637 err_cancel_link: 638 nla_nest_cancel(skb, linkinfo); 639 out: 640 return err; 641 } 642 643 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 644 { 645 struct sock *rtnl = net->rtnl; 646 int err = 0; 647 648 NETLINK_CB(skb).dst_group = group; 649 if (echo) 650 atomic_inc(&skb->users); 651 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 652 if (echo) 653 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 654 return err; 655 } 656 657 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 658 { 659 struct sock *rtnl = net->rtnl; 660 661 return nlmsg_unicast(rtnl, skb, pid); 662 } 663 EXPORT_SYMBOL(rtnl_unicast); 664 665 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 666 struct nlmsghdr *nlh, gfp_t flags) 667 { 668 struct sock *rtnl = net->rtnl; 669 int report = 0; 670 671 if (nlh) 672 report = nlmsg_report(nlh); 673 674 nlmsg_notify(rtnl, skb, pid, group, report, flags); 675 } 676 EXPORT_SYMBOL(rtnl_notify); 677 678 void rtnl_set_sk_err(struct net *net, u32 group, int error) 679 { 680 struct sock *rtnl = net->rtnl; 681 682 netlink_set_err(rtnl, 0, group, error); 683 } 684 EXPORT_SYMBOL(rtnl_set_sk_err); 685 686 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 687 { 688 struct nlattr *mx; 689 int i, valid = 0; 690 691 mx = nla_nest_start(skb, RTA_METRICS); 692 if (mx == NULL) 693 return -ENOBUFS; 694 695 for (i = 0; i < RTAX_MAX; i++) { 696 if (metrics[i]) { 697 if (i == RTAX_CC_ALGO - 1) { 698 char tmp[TCP_CA_NAME_MAX], *name; 699 700 name = tcp_ca_get_name_by_key(metrics[i], tmp); 701 if (!name) 702 continue; 703 if (nla_put_string(skb, i + 1, name)) 704 goto nla_put_failure; 705 } else if (i == RTAX_FEATURES - 1) { 706 u32 user_features = metrics[i] & RTAX_FEATURE_MASK; 707 708 if (!user_features) 709 continue; 710 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); 711 if (nla_put_u32(skb, i + 1, user_features)) 712 goto nla_put_failure; 713 } else { 714 if (nla_put_u32(skb, i + 1, metrics[i])) 715 goto nla_put_failure; 716 } 717 valid++; 718 } 719 } 720 721 if (!valid) { 722 nla_nest_cancel(skb, mx); 723 return 0; 724 } 725 726 return nla_nest_end(skb, mx); 727 728 nla_put_failure: 729 nla_nest_cancel(skb, mx); 730 return -EMSGSIZE; 731 } 732 EXPORT_SYMBOL(rtnetlink_put_metrics); 733 734 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 735 long expires, u32 error) 736 { 737 struct rta_cacheinfo ci = { 738 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 739 .rta_used = dst->__use, 740 .rta_clntref = atomic_read(&(dst->__refcnt)), 741 .rta_error = error, 742 .rta_id = id, 743 }; 744 745 if (expires) { 746 unsigned long clock; 747 748 clock = jiffies_to_clock_t(abs(expires)); 749 clock = min_t(unsigned long, clock, INT_MAX); 750 ci.rta_expires = (expires > 0) ? clock : -clock; 751 } 752 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 753 } 754 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 755 756 static void set_operstate(struct net_device *dev, unsigned char transition) 757 { 758 unsigned char operstate = dev->operstate; 759 760 switch (transition) { 761 case IF_OPER_UP: 762 if ((operstate == IF_OPER_DORMANT || 763 operstate == IF_OPER_UNKNOWN) && 764 !netif_dormant(dev)) 765 operstate = IF_OPER_UP; 766 break; 767 768 case IF_OPER_DORMANT: 769 if (operstate == IF_OPER_UP || 770 operstate == IF_OPER_UNKNOWN) 771 operstate = IF_OPER_DORMANT; 772 break; 773 } 774 775 if (dev->operstate != operstate) { 776 write_lock_bh(&dev_base_lock); 777 dev->operstate = operstate; 778 write_unlock_bh(&dev_base_lock); 779 netdev_state_change(dev); 780 } 781 } 782 783 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 784 { 785 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 786 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 787 } 788 789 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 790 const struct ifinfomsg *ifm) 791 { 792 unsigned int flags = ifm->ifi_flags; 793 794 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 795 if (ifm->ifi_change) 796 flags = (flags & ifm->ifi_change) | 797 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 798 799 return flags; 800 } 801 802 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 803 const struct rtnl_link_stats64 *b) 804 { 805 a->rx_packets = b->rx_packets; 806 a->tx_packets = b->tx_packets; 807 a->rx_bytes = b->rx_bytes; 808 a->tx_bytes = b->tx_bytes; 809 a->rx_errors = b->rx_errors; 810 a->tx_errors = b->tx_errors; 811 a->rx_dropped = b->rx_dropped; 812 a->tx_dropped = b->tx_dropped; 813 814 a->multicast = b->multicast; 815 a->collisions = b->collisions; 816 817 a->rx_length_errors = b->rx_length_errors; 818 a->rx_over_errors = b->rx_over_errors; 819 a->rx_crc_errors = b->rx_crc_errors; 820 a->rx_frame_errors = b->rx_frame_errors; 821 a->rx_fifo_errors = b->rx_fifo_errors; 822 a->rx_missed_errors = b->rx_missed_errors; 823 824 a->tx_aborted_errors = b->tx_aborted_errors; 825 a->tx_carrier_errors = b->tx_carrier_errors; 826 a->tx_fifo_errors = b->tx_fifo_errors; 827 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 828 a->tx_window_errors = b->tx_window_errors; 829 830 a->rx_compressed = b->rx_compressed; 831 a->tx_compressed = b->tx_compressed; 832 833 a->rx_nohandler = b->rx_nohandler; 834 } 835 836 /* All VF info */ 837 static inline int rtnl_vfinfo_size(const struct net_device *dev, 838 u32 ext_filter_mask) 839 { 840 if (dev->dev.parent && 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(0) + /* nest IFLA_XDP */ 905 nla_total_size(1); /* XDP_ATTACHED */ 906 907 if (!dev->netdev_ops->ndo_xdp) 908 return 0; 909 else 910 return xdp_size; 911 } 912 913 static noinline size_t if_nlmsg_size(const struct net_device *dev, 914 u32 ext_filter_mask) 915 { 916 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 917 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 918 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 919 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 920 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap)) 921 + nla_total_size(sizeof(struct rtnl_link_stats)) 922 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64)) 923 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 924 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 925 + nla_total_size(4) /* IFLA_TXQLEN */ 926 + nla_total_size(4) /* IFLA_WEIGHT */ 927 + nla_total_size(4) /* IFLA_MTU */ 928 + nla_total_size(4) /* IFLA_LINK */ 929 + nla_total_size(4) /* IFLA_MASTER */ 930 + nla_total_size(1) /* IFLA_CARRIER */ 931 + nla_total_size(4) /* IFLA_PROMISCUITY */ 932 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 933 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 934 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */ 935 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */ 936 + nla_total_size(1) /* IFLA_OPERSTATE */ 937 + nla_total_size(1) /* IFLA_LINKMODE */ 938 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 939 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 940 + nla_total_size(ext_filter_mask 941 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 942 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 943 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 944 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 945 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 946 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 947 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 948 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */ 949 + rtnl_xdp_size(dev) /* IFLA_XDP */ 950 + nla_total_size(1); /* IFLA_PROTO_DOWN */ 951 952 } 953 954 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 955 { 956 struct nlattr *vf_ports; 957 struct nlattr *vf_port; 958 int vf; 959 int err; 960 961 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 962 if (!vf_ports) 963 return -EMSGSIZE; 964 965 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 966 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 967 if (!vf_port) 968 goto nla_put_failure; 969 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 970 goto nla_put_failure; 971 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 972 if (err == -EMSGSIZE) 973 goto nla_put_failure; 974 if (err) { 975 nla_nest_cancel(skb, vf_port); 976 continue; 977 } 978 nla_nest_end(skb, vf_port); 979 } 980 981 nla_nest_end(skb, vf_ports); 982 983 return 0; 984 985 nla_put_failure: 986 nla_nest_cancel(skb, vf_ports); 987 return -EMSGSIZE; 988 } 989 990 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 991 { 992 struct nlattr *port_self; 993 int err; 994 995 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 996 if (!port_self) 997 return -EMSGSIZE; 998 999 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 1000 if (err) { 1001 nla_nest_cancel(skb, port_self); 1002 return (err == -EMSGSIZE) ? err : 0; 1003 } 1004 1005 nla_nest_end(skb, port_self); 1006 1007 return 0; 1008 } 1009 1010 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 1011 u32 ext_filter_mask) 1012 { 1013 int err; 1014 1015 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 1016 !(ext_filter_mask & RTEXT_FILTER_VF)) 1017 return 0; 1018 1019 err = rtnl_port_self_fill(skb, dev); 1020 if (err) 1021 return err; 1022 1023 if (dev_num_vf(dev->dev.parent)) { 1024 err = rtnl_vf_ports_fill(skb, dev); 1025 if (err) 1026 return err; 1027 } 1028 1029 return 0; 1030 } 1031 1032 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 1033 { 1034 int err; 1035 struct netdev_phys_item_id ppid; 1036 1037 err = dev_get_phys_port_id(dev, &ppid); 1038 if (err) { 1039 if (err == -EOPNOTSUPP) 1040 return 0; 1041 return err; 1042 } 1043 1044 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1045 return -EMSGSIZE; 1046 1047 return 0; 1048 } 1049 1050 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1051 { 1052 char name[IFNAMSIZ]; 1053 int err; 1054 1055 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1056 if (err) { 1057 if (err == -EOPNOTSUPP) 1058 return 0; 1059 return err; 1060 } 1061 1062 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 1063 return -EMSGSIZE; 1064 1065 return 0; 1066 } 1067 1068 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1069 { 1070 int err; 1071 struct switchdev_attr attr = { 1072 .orig_dev = dev, 1073 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 1074 .flags = SWITCHDEV_F_NO_RECURSE, 1075 }; 1076 1077 err = switchdev_port_attr_get(dev, &attr); 1078 if (err) { 1079 if (err == -EOPNOTSUPP) 1080 return 0; 1081 return err; 1082 } 1083 1084 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1085 attr.u.ppid.id)) 1086 return -EMSGSIZE; 1087 1088 return 0; 1089 } 1090 1091 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1092 struct net_device *dev) 1093 { 1094 struct rtnl_link_stats64 *sp; 1095 struct nlattr *attr; 1096 1097 attr = nla_reserve_64bit(skb, IFLA_STATS64, 1098 sizeof(struct rtnl_link_stats64), IFLA_PAD); 1099 if (!attr) 1100 return -EMSGSIZE; 1101 1102 sp = nla_data(attr); 1103 dev_get_stats(dev, sp); 1104 1105 attr = nla_reserve(skb, IFLA_STATS, 1106 sizeof(struct rtnl_link_stats)); 1107 if (!attr) 1108 return -EMSGSIZE; 1109 1110 copy_rtnl_link_stats(nla_data(attr), sp); 1111 1112 return 0; 1113 } 1114 1115 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1116 struct net_device *dev, 1117 int vfs_num, 1118 struct nlattr *vfinfo) 1119 { 1120 struct ifla_vf_rss_query_en vf_rss_query_en; 1121 struct nlattr *vf, *vfstats, *vfvlanlist; 1122 struct ifla_vf_link_state vf_linkstate; 1123 struct ifla_vf_vlan_info vf_vlan_info; 1124 struct ifla_vf_spoofchk vf_spoofchk; 1125 struct ifla_vf_tx_rate vf_tx_rate; 1126 struct ifla_vf_stats vf_stats; 1127 struct ifla_vf_trust vf_trust; 1128 struct ifla_vf_vlan vf_vlan; 1129 struct ifla_vf_rate vf_rate; 1130 struct ifla_vf_mac vf_mac; 1131 struct ifla_vf_info ivi; 1132 1133 /* Not all SR-IOV capable drivers support the 1134 * spoofcheck and "RSS query enable" query. Preset to 1135 * -1 so the user space tool can detect that the driver 1136 * didn't report anything. 1137 */ 1138 ivi.spoofchk = -1; 1139 ivi.rss_query_en = -1; 1140 ivi.trusted = -1; 1141 memset(ivi.mac, 0, sizeof(ivi.mac)); 1142 /* The default value for VF link state is "auto" 1143 * IFLA_VF_LINK_STATE_AUTO which equals zero 1144 */ 1145 ivi.linkstate = 0; 1146 /* VLAN Protocol by default is 802.1Q */ 1147 ivi.vlan_proto = htons(ETH_P_8021Q); 1148 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1149 return 0; 1150 1151 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info)); 1152 1153 vf_mac.vf = 1154 vf_vlan.vf = 1155 vf_vlan_info.vf = 1156 vf_rate.vf = 1157 vf_tx_rate.vf = 1158 vf_spoofchk.vf = 1159 vf_linkstate.vf = 1160 vf_rss_query_en.vf = 1161 vf_trust.vf = ivi.vf; 1162 1163 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1164 vf_vlan.vlan = ivi.vlan; 1165 vf_vlan.qos = ivi.qos; 1166 vf_vlan_info.vlan = ivi.vlan; 1167 vf_vlan_info.qos = ivi.qos; 1168 vf_vlan_info.vlan_proto = ivi.vlan_proto; 1169 vf_tx_rate.rate = ivi.max_tx_rate; 1170 vf_rate.min_tx_rate = ivi.min_tx_rate; 1171 vf_rate.max_tx_rate = ivi.max_tx_rate; 1172 vf_spoofchk.setting = ivi.spoofchk; 1173 vf_linkstate.link_state = ivi.linkstate; 1174 vf_rss_query_en.setting = ivi.rss_query_en; 1175 vf_trust.setting = ivi.trusted; 1176 vf = nla_nest_start(skb, IFLA_VF_INFO); 1177 if (!vf) 1178 goto nla_put_vfinfo_failure; 1179 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1180 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1181 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1182 &vf_rate) || 1183 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1184 &vf_tx_rate) || 1185 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1186 &vf_spoofchk) || 1187 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1188 &vf_linkstate) || 1189 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1190 sizeof(vf_rss_query_en), 1191 &vf_rss_query_en) || 1192 nla_put(skb, IFLA_VF_TRUST, 1193 sizeof(vf_trust), &vf_trust)) 1194 goto nla_put_vf_failure; 1195 vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST); 1196 if (!vfvlanlist) 1197 goto nla_put_vf_failure; 1198 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info), 1199 &vf_vlan_info)) { 1200 nla_nest_cancel(skb, vfvlanlist); 1201 goto nla_put_vf_failure; 1202 } 1203 nla_nest_end(skb, vfvlanlist); 1204 memset(&vf_stats, 0, sizeof(vf_stats)); 1205 if (dev->netdev_ops->ndo_get_vf_stats) 1206 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1207 &vf_stats); 1208 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1209 if (!vfstats) 1210 goto nla_put_vf_failure; 1211 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS, 1212 vf_stats.rx_packets, IFLA_VF_STATS_PAD) || 1213 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS, 1214 vf_stats.tx_packets, IFLA_VF_STATS_PAD) || 1215 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES, 1216 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) || 1217 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES, 1218 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) || 1219 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST, 1220 vf_stats.broadcast, IFLA_VF_STATS_PAD) || 1221 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST, 1222 vf_stats.multicast, IFLA_VF_STATS_PAD)) { 1223 nla_nest_cancel(skb, vfstats); 1224 goto nla_put_vf_failure; 1225 } 1226 nla_nest_end(skb, vfstats); 1227 nla_nest_end(skb, vf); 1228 return 0; 1229 1230 nla_put_vf_failure: 1231 nla_nest_cancel(skb, vf); 1232 nla_put_vfinfo_failure: 1233 nla_nest_cancel(skb, vfinfo); 1234 return -EMSGSIZE; 1235 } 1236 1237 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1238 { 1239 struct rtnl_link_ifmap map; 1240 1241 memset(&map, 0, sizeof(map)); 1242 map.mem_start = dev->mem_start; 1243 map.mem_end = dev->mem_end; 1244 map.base_addr = dev->base_addr; 1245 map.irq = dev->irq; 1246 map.dma = dev->dma; 1247 map.port = dev->if_port; 1248 1249 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD)) 1250 return -EMSGSIZE; 1251 1252 return 0; 1253 } 1254 1255 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev) 1256 { 1257 struct netdev_xdp xdp_op = {}; 1258 struct nlattr *xdp; 1259 int err; 1260 1261 if (!dev->netdev_ops->ndo_xdp) 1262 return 0; 1263 xdp = nla_nest_start(skb, IFLA_XDP); 1264 if (!xdp) 1265 return -EMSGSIZE; 1266 xdp_op.command = XDP_QUERY_PROG; 1267 err = dev->netdev_ops->ndo_xdp(dev, &xdp_op); 1268 if (err) 1269 goto err_cancel; 1270 err = nla_put_u8(skb, IFLA_XDP_ATTACHED, xdp_op.prog_attached); 1271 if (err) 1272 goto err_cancel; 1273 1274 nla_nest_end(skb, xdp); 1275 return 0; 1276 1277 err_cancel: 1278 nla_nest_cancel(skb, xdp); 1279 return err; 1280 } 1281 1282 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1283 int type, u32 pid, u32 seq, u32 change, 1284 unsigned int flags, u32 ext_filter_mask) 1285 { 1286 struct ifinfomsg *ifm; 1287 struct nlmsghdr *nlh; 1288 struct nlattr *af_spec; 1289 struct rtnl_af_ops *af_ops; 1290 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1291 1292 ASSERT_RTNL(); 1293 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1294 if (nlh == NULL) 1295 return -EMSGSIZE; 1296 1297 ifm = nlmsg_data(nlh); 1298 ifm->ifi_family = AF_UNSPEC; 1299 ifm->__ifi_pad = 0; 1300 ifm->ifi_type = dev->type; 1301 ifm->ifi_index = dev->ifindex; 1302 ifm->ifi_flags = dev_get_flags(dev); 1303 ifm->ifi_change = change; 1304 1305 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1306 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1307 nla_put_u8(skb, IFLA_OPERSTATE, 1308 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1309 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1310 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1311 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1312 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1313 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1314 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) || 1315 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) || 1316 #ifdef CONFIG_RPS 1317 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1318 #endif 1319 (dev->ifindex != dev_get_iflink(dev) && 1320 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1321 (upper_dev && 1322 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1323 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1324 (dev->qdisc && 1325 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1326 (dev->ifalias && 1327 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1328 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1329 atomic_read(&dev->carrier_changes)) || 1330 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1331 goto nla_put_failure; 1332 1333 if (rtnl_fill_link_ifmap(skb, dev)) 1334 goto nla_put_failure; 1335 1336 if (dev->addr_len) { 1337 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1338 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1339 goto nla_put_failure; 1340 } 1341 1342 if (rtnl_phys_port_id_fill(skb, dev)) 1343 goto nla_put_failure; 1344 1345 if (rtnl_phys_port_name_fill(skb, dev)) 1346 goto nla_put_failure; 1347 1348 if (rtnl_phys_switch_id_fill(skb, dev)) 1349 goto nla_put_failure; 1350 1351 if (rtnl_fill_stats(skb, dev)) 1352 goto nla_put_failure; 1353 1354 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1355 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1356 goto nla_put_failure; 1357 1358 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent && 1359 ext_filter_mask & RTEXT_FILTER_VF) { 1360 int i; 1361 struct nlattr *vfinfo; 1362 int num_vfs = dev_num_vf(dev->dev.parent); 1363 1364 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1365 if (!vfinfo) 1366 goto nla_put_failure; 1367 for (i = 0; i < num_vfs; i++) { 1368 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1369 goto nla_put_failure; 1370 } 1371 1372 nla_nest_end(skb, vfinfo); 1373 } 1374 1375 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1376 goto nla_put_failure; 1377 1378 if (rtnl_xdp_fill(skb, dev)) 1379 goto nla_put_failure; 1380 1381 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1382 if (rtnl_link_fill(skb, dev) < 0) 1383 goto nla_put_failure; 1384 } 1385 1386 if (dev->rtnl_link_ops && 1387 dev->rtnl_link_ops->get_link_net) { 1388 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1389 1390 if (!net_eq(dev_net(dev), link_net)) { 1391 int id = peernet2id_alloc(dev_net(dev), link_net); 1392 1393 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1394 goto nla_put_failure; 1395 } 1396 } 1397 1398 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1399 goto nla_put_failure; 1400 1401 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1402 if (af_ops->fill_link_af) { 1403 struct nlattr *af; 1404 int err; 1405 1406 if (!(af = nla_nest_start(skb, af_ops->family))) 1407 goto nla_put_failure; 1408 1409 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1410 1411 /* 1412 * Caller may return ENODATA to indicate that there 1413 * was no data to be dumped. This is not an error, it 1414 * means we should trim the attribute header and 1415 * continue. 1416 */ 1417 if (err == -ENODATA) 1418 nla_nest_cancel(skb, af); 1419 else if (err < 0) 1420 goto nla_put_failure; 1421 1422 nla_nest_end(skb, af); 1423 } 1424 } 1425 1426 nla_nest_end(skb, af_spec); 1427 1428 nlmsg_end(skb, nlh); 1429 return 0; 1430 1431 nla_put_failure: 1432 nlmsg_cancel(skb, nlh); 1433 return -EMSGSIZE; 1434 } 1435 1436 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1437 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1438 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1439 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1440 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1441 [IFLA_MTU] = { .type = NLA_U32 }, 1442 [IFLA_LINK] = { .type = NLA_U32 }, 1443 [IFLA_MASTER] = { .type = NLA_U32 }, 1444 [IFLA_CARRIER] = { .type = NLA_U8 }, 1445 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1446 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1447 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1448 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1449 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1450 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1451 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1452 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1453 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1454 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1455 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1456 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1457 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1458 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1459 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1460 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1461 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1462 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1463 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1464 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1465 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1466 [IFLA_XDP] = { .type = NLA_NESTED }, 1467 }; 1468 1469 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1470 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1471 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1472 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1473 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1474 }; 1475 1476 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1477 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1478 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1479 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED }, 1480 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1481 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1482 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1483 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1484 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1485 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1486 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1487 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1488 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1489 }; 1490 1491 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1492 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1493 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1494 .len = PORT_PROFILE_MAX }, 1495 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1496 .len = sizeof(struct ifla_port_vsi)}, 1497 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1498 .len = PORT_UUID_MAX }, 1499 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1500 .len = PORT_UUID_MAX }, 1501 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1502 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1503 }; 1504 1505 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = { 1506 [IFLA_XDP_FD] = { .type = NLA_S32 }, 1507 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 }, 1508 [IFLA_XDP_FLAGS] = { .type = NLA_U32 }, 1509 }; 1510 1511 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 1512 { 1513 const struct rtnl_link_ops *ops = NULL; 1514 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 1515 1516 if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0) 1517 return NULL; 1518 1519 if (linfo[IFLA_INFO_KIND]) { 1520 char kind[MODULE_NAME_LEN]; 1521 1522 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 1523 ops = rtnl_link_ops_get(kind); 1524 } 1525 1526 return ops; 1527 } 1528 1529 static bool link_master_filtered(struct net_device *dev, int master_idx) 1530 { 1531 struct net_device *master; 1532 1533 if (!master_idx) 1534 return false; 1535 1536 master = netdev_master_upper_dev_get(dev); 1537 if (!master || master->ifindex != master_idx) 1538 return true; 1539 1540 return false; 1541 } 1542 1543 static bool link_kind_filtered(const struct net_device *dev, 1544 const struct rtnl_link_ops *kind_ops) 1545 { 1546 if (kind_ops && dev->rtnl_link_ops != kind_ops) 1547 return true; 1548 1549 return false; 1550 } 1551 1552 static bool link_dump_filtered(struct net_device *dev, 1553 int master_idx, 1554 const struct rtnl_link_ops *kind_ops) 1555 { 1556 if (link_master_filtered(dev, master_idx) || 1557 link_kind_filtered(dev, kind_ops)) 1558 return true; 1559 1560 return false; 1561 } 1562 1563 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1564 { 1565 struct net *net = sock_net(skb->sk); 1566 int h, s_h; 1567 int idx = 0, s_idx; 1568 struct net_device *dev; 1569 struct hlist_head *head; 1570 struct nlattr *tb[IFLA_MAX+1]; 1571 u32 ext_filter_mask = 0; 1572 const struct rtnl_link_ops *kind_ops = NULL; 1573 unsigned int flags = NLM_F_MULTI; 1574 int master_idx = 0; 1575 int err; 1576 int hdrlen; 1577 1578 s_h = cb->args[0]; 1579 s_idx = cb->args[1]; 1580 1581 cb->seq = net->dev_base_seq; 1582 1583 /* A hack to preserve kernel<->userspace interface. 1584 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1585 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1586 * what iproute2 < v3.9.0 used. 1587 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1588 * attribute, its netlink message is shorter than struct ifinfomsg. 1589 */ 1590 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1591 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1592 1593 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1594 1595 if (tb[IFLA_EXT_MASK]) 1596 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1597 1598 if (tb[IFLA_MASTER]) 1599 master_idx = nla_get_u32(tb[IFLA_MASTER]); 1600 1601 if (tb[IFLA_LINKINFO]) 1602 kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]); 1603 1604 if (master_idx || kind_ops) 1605 flags |= NLM_F_DUMP_FILTERED; 1606 } 1607 1608 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1609 idx = 0; 1610 head = &net->dev_index_head[h]; 1611 hlist_for_each_entry(dev, head, index_hlist) { 1612 if (link_dump_filtered(dev, master_idx, kind_ops)) 1613 goto cont; 1614 if (idx < s_idx) 1615 goto cont; 1616 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1617 NETLINK_CB(cb->skb).portid, 1618 cb->nlh->nlmsg_seq, 0, 1619 flags, 1620 ext_filter_mask); 1621 /* If we ran out of room on the first message, 1622 * we're in trouble 1623 */ 1624 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1625 1626 if (err < 0) 1627 goto out; 1628 1629 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1630 cont: 1631 idx++; 1632 } 1633 } 1634 out: 1635 cb->args[1] = idx; 1636 cb->args[0] = h; 1637 1638 return skb->len; 1639 } 1640 1641 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1642 { 1643 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1644 } 1645 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1646 1647 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1648 { 1649 struct net *net; 1650 /* Examine the link attributes and figure out which 1651 * network namespace we are talking about. 1652 */ 1653 if (tb[IFLA_NET_NS_PID]) 1654 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1655 else if (tb[IFLA_NET_NS_FD]) 1656 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1657 else 1658 net = get_net(src_net); 1659 return net; 1660 } 1661 EXPORT_SYMBOL(rtnl_link_get_net); 1662 1663 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1664 { 1665 if (dev) { 1666 if (tb[IFLA_ADDRESS] && 1667 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1668 return -EINVAL; 1669 1670 if (tb[IFLA_BROADCAST] && 1671 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1672 return -EINVAL; 1673 } 1674 1675 if (tb[IFLA_AF_SPEC]) { 1676 struct nlattr *af; 1677 int rem, err; 1678 1679 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1680 const struct rtnl_af_ops *af_ops; 1681 1682 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1683 return -EAFNOSUPPORT; 1684 1685 if (!af_ops->set_link_af) 1686 return -EOPNOTSUPP; 1687 1688 if (af_ops->validate_link_af) { 1689 err = af_ops->validate_link_af(dev, af); 1690 if (err < 0) 1691 return err; 1692 } 1693 } 1694 } 1695 1696 return 0; 1697 } 1698 1699 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt, 1700 int guid_type) 1701 { 1702 const struct net_device_ops *ops = dev->netdev_ops; 1703 1704 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type); 1705 } 1706 1707 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type) 1708 { 1709 if (dev->type != ARPHRD_INFINIBAND) 1710 return -EOPNOTSUPP; 1711 1712 return handle_infiniband_guid(dev, ivt, guid_type); 1713 } 1714 1715 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 1716 { 1717 const struct net_device_ops *ops = dev->netdev_ops; 1718 int err = -EINVAL; 1719 1720 if (tb[IFLA_VF_MAC]) { 1721 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 1722 1723 err = -EOPNOTSUPP; 1724 if (ops->ndo_set_vf_mac) 1725 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1726 ivm->mac); 1727 if (err < 0) 1728 return err; 1729 } 1730 1731 if (tb[IFLA_VF_VLAN]) { 1732 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 1733 1734 err = -EOPNOTSUPP; 1735 if (ops->ndo_set_vf_vlan) 1736 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 1737 ivv->qos, 1738 htons(ETH_P_8021Q)); 1739 if (err < 0) 1740 return err; 1741 } 1742 1743 if (tb[IFLA_VF_VLAN_LIST]) { 1744 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN]; 1745 struct nlattr *attr; 1746 int rem, len = 0; 1747 1748 err = -EOPNOTSUPP; 1749 if (!ops->ndo_set_vf_vlan) 1750 return err; 1751 1752 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) { 1753 if (nla_type(attr) != IFLA_VF_VLAN_INFO || 1754 nla_len(attr) < NLA_HDRLEN) { 1755 return -EINVAL; 1756 } 1757 if (len >= MAX_VLAN_LIST_LEN) 1758 return -EOPNOTSUPP; 1759 ivvl[len] = nla_data(attr); 1760 1761 len++; 1762 } 1763 if (len == 0) 1764 return -EINVAL; 1765 1766 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan, 1767 ivvl[0]->qos, ivvl[0]->vlan_proto); 1768 if (err < 0) 1769 return err; 1770 } 1771 1772 if (tb[IFLA_VF_TX_RATE]) { 1773 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1774 struct ifla_vf_info ivf; 1775 1776 err = -EOPNOTSUPP; 1777 if (ops->ndo_get_vf_config) 1778 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 1779 if (err < 0) 1780 return err; 1781 1782 err = -EOPNOTSUPP; 1783 if (ops->ndo_set_vf_rate) 1784 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1785 ivf.min_tx_rate, 1786 ivt->rate); 1787 if (err < 0) 1788 return err; 1789 } 1790 1791 if (tb[IFLA_VF_RATE]) { 1792 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 1793 1794 err = -EOPNOTSUPP; 1795 if (ops->ndo_set_vf_rate) 1796 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1797 ivt->min_tx_rate, 1798 ivt->max_tx_rate); 1799 if (err < 0) 1800 return err; 1801 } 1802 1803 if (tb[IFLA_VF_SPOOFCHK]) { 1804 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 1805 1806 err = -EOPNOTSUPP; 1807 if (ops->ndo_set_vf_spoofchk) 1808 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1809 ivs->setting); 1810 if (err < 0) 1811 return err; 1812 } 1813 1814 if (tb[IFLA_VF_LINK_STATE]) { 1815 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 1816 1817 err = -EOPNOTSUPP; 1818 if (ops->ndo_set_vf_link_state) 1819 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1820 ivl->link_state); 1821 if (err < 0) 1822 return err; 1823 } 1824 1825 if (tb[IFLA_VF_RSS_QUERY_EN]) { 1826 struct ifla_vf_rss_query_en *ivrssq_en; 1827 1828 err = -EOPNOTSUPP; 1829 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 1830 if (ops->ndo_set_vf_rss_query_en) 1831 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 1832 ivrssq_en->setting); 1833 if (err < 0) 1834 return err; 1835 } 1836 1837 if (tb[IFLA_VF_TRUST]) { 1838 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 1839 1840 err = -EOPNOTSUPP; 1841 if (ops->ndo_set_vf_trust) 1842 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 1843 if (err < 0) 1844 return err; 1845 } 1846 1847 if (tb[IFLA_VF_IB_NODE_GUID]) { 1848 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]); 1849 1850 if (!ops->ndo_set_vf_guid) 1851 return -EOPNOTSUPP; 1852 1853 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID); 1854 } 1855 1856 if (tb[IFLA_VF_IB_PORT_GUID]) { 1857 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]); 1858 1859 if (!ops->ndo_set_vf_guid) 1860 return -EOPNOTSUPP; 1861 1862 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID); 1863 } 1864 1865 return err; 1866 } 1867 1868 static int do_set_master(struct net_device *dev, int ifindex) 1869 { 1870 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1871 const struct net_device_ops *ops; 1872 int err; 1873 1874 if (upper_dev) { 1875 if (upper_dev->ifindex == ifindex) 1876 return 0; 1877 ops = upper_dev->netdev_ops; 1878 if (ops->ndo_del_slave) { 1879 err = ops->ndo_del_slave(upper_dev, dev); 1880 if (err) 1881 return err; 1882 } else { 1883 return -EOPNOTSUPP; 1884 } 1885 } 1886 1887 if (ifindex) { 1888 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1889 if (!upper_dev) 1890 return -EINVAL; 1891 ops = upper_dev->netdev_ops; 1892 if (ops->ndo_add_slave) { 1893 err = ops->ndo_add_slave(upper_dev, dev); 1894 if (err) 1895 return err; 1896 } else { 1897 return -EOPNOTSUPP; 1898 } 1899 } 1900 return 0; 1901 } 1902 1903 #define DO_SETLINK_MODIFIED 0x01 1904 /* notify flag means notify + modified. */ 1905 #define DO_SETLINK_NOTIFY 0x03 1906 static int do_setlink(const struct sk_buff *skb, 1907 struct net_device *dev, struct ifinfomsg *ifm, 1908 struct nlattr **tb, char *ifname, int status) 1909 { 1910 const struct net_device_ops *ops = dev->netdev_ops; 1911 int err; 1912 1913 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1914 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1915 if (IS_ERR(net)) { 1916 err = PTR_ERR(net); 1917 goto errout; 1918 } 1919 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1920 put_net(net); 1921 err = -EPERM; 1922 goto errout; 1923 } 1924 err = dev_change_net_namespace(dev, net, ifname); 1925 put_net(net); 1926 if (err) 1927 goto errout; 1928 status |= DO_SETLINK_MODIFIED; 1929 } 1930 1931 if (tb[IFLA_MAP]) { 1932 struct rtnl_link_ifmap *u_map; 1933 struct ifmap k_map; 1934 1935 if (!ops->ndo_set_config) { 1936 err = -EOPNOTSUPP; 1937 goto errout; 1938 } 1939 1940 if (!netif_device_present(dev)) { 1941 err = -ENODEV; 1942 goto errout; 1943 } 1944 1945 u_map = nla_data(tb[IFLA_MAP]); 1946 k_map.mem_start = (unsigned long) u_map->mem_start; 1947 k_map.mem_end = (unsigned long) u_map->mem_end; 1948 k_map.base_addr = (unsigned short) u_map->base_addr; 1949 k_map.irq = (unsigned char) u_map->irq; 1950 k_map.dma = (unsigned char) u_map->dma; 1951 k_map.port = (unsigned char) u_map->port; 1952 1953 err = ops->ndo_set_config(dev, &k_map); 1954 if (err < 0) 1955 goto errout; 1956 1957 status |= DO_SETLINK_NOTIFY; 1958 } 1959 1960 if (tb[IFLA_ADDRESS]) { 1961 struct sockaddr *sa; 1962 int len; 1963 1964 len = sizeof(sa_family_t) + dev->addr_len; 1965 sa = kmalloc(len, GFP_KERNEL); 1966 if (!sa) { 1967 err = -ENOMEM; 1968 goto errout; 1969 } 1970 sa->sa_family = dev->type; 1971 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1972 dev->addr_len); 1973 err = dev_set_mac_address(dev, sa); 1974 kfree(sa); 1975 if (err) 1976 goto errout; 1977 status |= DO_SETLINK_MODIFIED; 1978 } 1979 1980 if (tb[IFLA_MTU]) { 1981 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1982 if (err < 0) 1983 goto errout; 1984 status |= DO_SETLINK_MODIFIED; 1985 } 1986 1987 if (tb[IFLA_GROUP]) { 1988 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1989 status |= DO_SETLINK_NOTIFY; 1990 } 1991 1992 /* 1993 * Interface selected by interface index but interface 1994 * name provided implies that a name change has been 1995 * requested. 1996 */ 1997 if (ifm->ifi_index > 0 && ifname[0]) { 1998 err = dev_change_name(dev, ifname); 1999 if (err < 0) 2000 goto errout; 2001 status |= DO_SETLINK_MODIFIED; 2002 } 2003 2004 if (tb[IFLA_IFALIAS]) { 2005 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 2006 nla_len(tb[IFLA_IFALIAS])); 2007 if (err < 0) 2008 goto errout; 2009 status |= DO_SETLINK_NOTIFY; 2010 } 2011 2012 if (tb[IFLA_BROADCAST]) { 2013 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 2014 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 2015 } 2016 2017 if (ifm->ifi_flags || ifm->ifi_change) { 2018 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2019 if (err < 0) 2020 goto errout; 2021 } 2022 2023 if (tb[IFLA_MASTER]) { 2024 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 2025 if (err) 2026 goto errout; 2027 status |= DO_SETLINK_MODIFIED; 2028 } 2029 2030 if (tb[IFLA_CARRIER]) { 2031 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 2032 if (err) 2033 goto errout; 2034 status |= DO_SETLINK_MODIFIED; 2035 } 2036 2037 if (tb[IFLA_TXQLEN]) { 2038 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 2039 unsigned long orig_len = dev->tx_queue_len; 2040 2041 if (dev->tx_queue_len ^ value) { 2042 dev->tx_queue_len = value; 2043 err = call_netdevice_notifiers( 2044 NETDEV_CHANGE_TX_QUEUE_LEN, dev); 2045 err = notifier_to_errno(err); 2046 if (err) { 2047 dev->tx_queue_len = orig_len; 2048 goto errout; 2049 } 2050 status |= DO_SETLINK_NOTIFY; 2051 } 2052 } 2053 2054 if (tb[IFLA_OPERSTATE]) 2055 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2056 2057 if (tb[IFLA_LINKMODE]) { 2058 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 2059 2060 write_lock_bh(&dev_base_lock); 2061 if (dev->link_mode ^ value) 2062 status |= DO_SETLINK_NOTIFY; 2063 dev->link_mode = value; 2064 write_unlock_bh(&dev_base_lock); 2065 } 2066 2067 if (tb[IFLA_VFINFO_LIST]) { 2068 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 2069 struct nlattr *attr; 2070 int rem; 2071 2072 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 2073 if (nla_type(attr) != IFLA_VF_INFO || 2074 nla_len(attr) < NLA_HDRLEN) { 2075 err = -EINVAL; 2076 goto errout; 2077 } 2078 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 2079 ifla_vf_policy); 2080 if (err < 0) 2081 goto errout; 2082 err = do_setvfinfo(dev, vfinfo); 2083 if (err < 0) 2084 goto errout; 2085 status |= DO_SETLINK_NOTIFY; 2086 } 2087 } 2088 err = 0; 2089 2090 if (tb[IFLA_VF_PORTS]) { 2091 struct nlattr *port[IFLA_PORT_MAX+1]; 2092 struct nlattr *attr; 2093 int vf; 2094 int rem; 2095 2096 err = -EOPNOTSUPP; 2097 if (!ops->ndo_set_vf_port) 2098 goto errout; 2099 2100 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 2101 if (nla_type(attr) != IFLA_VF_PORT || 2102 nla_len(attr) < NLA_HDRLEN) { 2103 err = -EINVAL; 2104 goto errout; 2105 } 2106 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 2107 ifla_port_policy); 2108 if (err < 0) 2109 goto errout; 2110 if (!port[IFLA_PORT_VF]) { 2111 err = -EOPNOTSUPP; 2112 goto errout; 2113 } 2114 vf = nla_get_u32(port[IFLA_PORT_VF]); 2115 err = ops->ndo_set_vf_port(dev, vf, port); 2116 if (err < 0) 2117 goto errout; 2118 status |= DO_SETLINK_NOTIFY; 2119 } 2120 } 2121 err = 0; 2122 2123 if (tb[IFLA_PORT_SELF]) { 2124 struct nlattr *port[IFLA_PORT_MAX+1]; 2125 2126 err = nla_parse_nested(port, IFLA_PORT_MAX, 2127 tb[IFLA_PORT_SELF], ifla_port_policy); 2128 if (err < 0) 2129 goto errout; 2130 2131 err = -EOPNOTSUPP; 2132 if (ops->ndo_set_vf_port) 2133 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 2134 if (err < 0) 2135 goto errout; 2136 status |= DO_SETLINK_NOTIFY; 2137 } 2138 2139 if (tb[IFLA_AF_SPEC]) { 2140 struct nlattr *af; 2141 int rem; 2142 2143 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2144 const struct rtnl_af_ops *af_ops; 2145 2146 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 2147 BUG(); 2148 2149 err = af_ops->set_link_af(dev, af); 2150 if (err < 0) 2151 goto errout; 2152 2153 status |= DO_SETLINK_NOTIFY; 2154 } 2155 } 2156 err = 0; 2157 2158 if (tb[IFLA_PROTO_DOWN]) { 2159 err = dev_change_proto_down(dev, 2160 nla_get_u8(tb[IFLA_PROTO_DOWN])); 2161 if (err) 2162 goto errout; 2163 status |= DO_SETLINK_NOTIFY; 2164 } 2165 2166 if (tb[IFLA_XDP]) { 2167 struct nlattr *xdp[IFLA_XDP_MAX + 1]; 2168 u32 xdp_flags = 0; 2169 2170 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP], 2171 ifla_xdp_policy); 2172 if (err < 0) 2173 goto errout; 2174 2175 if (xdp[IFLA_XDP_ATTACHED]) { 2176 err = -EINVAL; 2177 goto errout; 2178 } 2179 2180 if (xdp[IFLA_XDP_FLAGS]) { 2181 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]); 2182 if (xdp_flags & ~XDP_FLAGS_MASK) { 2183 err = -EINVAL; 2184 goto errout; 2185 } 2186 } 2187 2188 if (xdp[IFLA_XDP_FD]) { 2189 err = dev_change_xdp_fd(dev, 2190 nla_get_s32(xdp[IFLA_XDP_FD]), 2191 xdp_flags); 2192 if (err) 2193 goto errout; 2194 status |= DO_SETLINK_NOTIFY; 2195 } 2196 } 2197 2198 errout: 2199 if (status & DO_SETLINK_MODIFIED) { 2200 if (status & DO_SETLINK_NOTIFY) 2201 netdev_state_change(dev); 2202 2203 if (err < 0) 2204 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", 2205 dev->name); 2206 } 2207 2208 return err; 2209 } 2210 2211 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2212 { 2213 struct net *net = sock_net(skb->sk); 2214 struct ifinfomsg *ifm; 2215 struct net_device *dev; 2216 int err; 2217 struct nlattr *tb[IFLA_MAX+1]; 2218 char ifname[IFNAMSIZ]; 2219 2220 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2221 if (err < 0) 2222 goto errout; 2223 2224 if (tb[IFLA_IFNAME]) 2225 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2226 else 2227 ifname[0] = '\0'; 2228 2229 err = -EINVAL; 2230 ifm = nlmsg_data(nlh); 2231 if (ifm->ifi_index > 0) 2232 dev = __dev_get_by_index(net, ifm->ifi_index); 2233 else if (tb[IFLA_IFNAME]) 2234 dev = __dev_get_by_name(net, ifname); 2235 else 2236 goto errout; 2237 2238 if (dev == NULL) { 2239 err = -ENODEV; 2240 goto errout; 2241 } 2242 2243 err = validate_linkmsg(dev, tb); 2244 if (err < 0) 2245 goto errout; 2246 2247 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 2248 errout: 2249 return err; 2250 } 2251 2252 static int rtnl_group_dellink(const struct net *net, int group) 2253 { 2254 struct net_device *dev, *aux; 2255 LIST_HEAD(list_kill); 2256 bool found = false; 2257 2258 if (!group) 2259 return -EPERM; 2260 2261 for_each_netdev(net, dev) { 2262 if (dev->group == group) { 2263 const struct rtnl_link_ops *ops; 2264 2265 found = true; 2266 ops = dev->rtnl_link_ops; 2267 if (!ops || !ops->dellink) 2268 return -EOPNOTSUPP; 2269 } 2270 } 2271 2272 if (!found) 2273 return -ENODEV; 2274 2275 for_each_netdev_safe(net, dev, aux) { 2276 if (dev->group == group) { 2277 const struct rtnl_link_ops *ops; 2278 2279 ops = dev->rtnl_link_ops; 2280 ops->dellink(dev, &list_kill); 2281 } 2282 } 2283 unregister_netdevice_many(&list_kill); 2284 2285 return 0; 2286 } 2287 2288 int rtnl_delete_link(struct net_device *dev) 2289 { 2290 const struct rtnl_link_ops *ops; 2291 LIST_HEAD(list_kill); 2292 2293 ops = dev->rtnl_link_ops; 2294 if (!ops || !ops->dellink) 2295 return -EOPNOTSUPP; 2296 2297 ops->dellink(dev, &list_kill); 2298 unregister_netdevice_many(&list_kill); 2299 2300 return 0; 2301 } 2302 EXPORT_SYMBOL_GPL(rtnl_delete_link); 2303 2304 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2305 { 2306 struct net *net = sock_net(skb->sk); 2307 struct net_device *dev; 2308 struct ifinfomsg *ifm; 2309 char ifname[IFNAMSIZ]; 2310 struct nlattr *tb[IFLA_MAX+1]; 2311 int err; 2312 2313 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2314 if (err < 0) 2315 return err; 2316 2317 if (tb[IFLA_IFNAME]) 2318 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2319 2320 ifm = nlmsg_data(nlh); 2321 if (ifm->ifi_index > 0) 2322 dev = __dev_get_by_index(net, ifm->ifi_index); 2323 else if (tb[IFLA_IFNAME]) 2324 dev = __dev_get_by_name(net, ifname); 2325 else if (tb[IFLA_GROUP]) 2326 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 2327 else 2328 return -EINVAL; 2329 2330 if (!dev) 2331 return -ENODEV; 2332 2333 return rtnl_delete_link(dev); 2334 } 2335 2336 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 2337 { 2338 unsigned int old_flags; 2339 int err; 2340 2341 old_flags = dev->flags; 2342 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2343 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2344 if (err < 0) 2345 return err; 2346 } 2347 2348 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2349 2350 __dev_notify_flags(dev, old_flags, ~0U); 2351 return 0; 2352 } 2353 EXPORT_SYMBOL(rtnl_configure_link); 2354 2355 struct net_device *rtnl_create_link(struct net *net, 2356 const char *ifname, unsigned char name_assign_type, 2357 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2358 { 2359 int err; 2360 struct net_device *dev; 2361 unsigned int num_tx_queues = 1; 2362 unsigned int num_rx_queues = 1; 2363 2364 if (tb[IFLA_NUM_TX_QUEUES]) 2365 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2366 else if (ops->get_num_tx_queues) 2367 num_tx_queues = ops->get_num_tx_queues(); 2368 2369 if (tb[IFLA_NUM_RX_QUEUES]) 2370 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2371 else if (ops->get_num_rx_queues) 2372 num_rx_queues = ops->get_num_rx_queues(); 2373 2374 err = -ENOMEM; 2375 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2376 ops->setup, num_tx_queues, num_rx_queues); 2377 if (!dev) 2378 goto err; 2379 2380 dev_net_set(dev, net); 2381 dev->rtnl_link_ops = ops; 2382 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2383 2384 if (tb[IFLA_MTU]) 2385 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2386 if (tb[IFLA_ADDRESS]) { 2387 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2388 nla_len(tb[IFLA_ADDRESS])); 2389 dev->addr_assign_type = NET_ADDR_SET; 2390 } 2391 if (tb[IFLA_BROADCAST]) 2392 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2393 nla_len(tb[IFLA_BROADCAST])); 2394 if (tb[IFLA_TXQLEN]) 2395 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2396 if (tb[IFLA_OPERSTATE]) 2397 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2398 if (tb[IFLA_LINKMODE]) 2399 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2400 if (tb[IFLA_GROUP]) 2401 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2402 2403 return dev; 2404 2405 err: 2406 return ERR_PTR(err); 2407 } 2408 EXPORT_SYMBOL(rtnl_create_link); 2409 2410 static int rtnl_group_changelink(const struct sk_buff *skb, 2411 struct net *net, int group, 2412 struct ifinfomsg *ifm, 2413 struct nlattr **tb) 2414 { 2415 struct net_device *dev, *aux; 2416 int err; 2417 2418 for_each_netdev_safe(net, dev, aux) { 2419 if (dev->group == group) { 2420 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2421 if (err < 0) 2422 return err; 2423 } 2424 } 2425 2426 return 0; 2427 } 2428 2429 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2430 { 2431 struct net *net = sock_net(skb->sk); 2432 const struct rtnl_link_ops *ops; 2433 const struct rtnl_link_ops *m_ops = NULL; 2434 struct net_device *dev; 2435 struct net_device *master_dev = NULL; 2436 struct ifinfomsg *ifm; 2437 char kind[MODULE_NAME_LEN]; 2438 char ifname[IFNAMSIZ]; 2439 struct nlattr *tb[IFLA_MAX+1]; 2440 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2441 unsigned char name_assign_type = NET_NAME_USER; 2442 int err; 2443 2444 #ifdef CONFIG_MODULES 2445 replay: 2446 #endif 2447 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2448 if (err < 0) 2449 return err; 2450 2451 if (tb[IFLA_IFNAME]) 2452 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2453 else 2454 ifname[0] = '\0'; 2455 2456 ifm = nlmsg_data(nlh); 2457 if (ifm->ifi_index > 0) 2458 dev = __dev_get_by_index(net, ifm->ifi_index); 2459 else { 2460 if (ifname[0]) 2461 dev = __dev_get_by_name(net, ifname); 2462 else 2463 dev = NULL; 2464 } 2465 2466 if (dev) { 2467 master_dev = netdev_master_upper_dev_get(dev); 2468 if (master_dev) 2469 m_ops = master_dev->rtnl_link_ops; 2470 } 2471 2472 err = validate_linkmsg(dev, tb); 2473 if (err < 0) 2474 return err; 2475 2476 if (tb[IFLA_LINKINFO]) { 2477 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2478 tb[IFLA_LINKINFO], ifla_info_policy); 2479 if (err < 0) 2480 return err; 2481 } else 2482 memset(linkinfo, 0, sizeof(linkinfo)); 2483 2484 if (linkinfo[IFLA_INFO_KIND]) { 2485 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2486 ops = rtnl_link_ops_get(kind); 2487 } else { 2488 kind[0] = '\0'; 2489 ops = NULL; 2490 } 2491 2492 if (1) { 2493 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2494 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2495 struct nlattr **data = NULL; 2496 struct nlattr **slave_data = NULL; 2497 struct net *dest_net, *link_net = NULL; 2498 2499 if (ops) { 2500 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2501 err = nla_parse_nested(attr, ops->maxtype, 2502 linkinfo[IFLA_INFO_DATA], 2503 ops->policy); 2504 if (err < 0) 2505 return err; 2506 data = attr; 2507 } 2508 if (ops->validate) { 2509 err = ops->validate(tb, data); 2510 if (err < 0) 2511 return err; 2512 } 2513 } 2514 2515 if (m_ops) { 2516 if (m_ops->slave_maxtype && 2517 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2518 err = nla_parse_nested(slave_attr, 2519 m_ops->slave_maxtype, 2520 linkinfo[IFLA_INFO_SLAVE_DATA], 2521 m_ops->slave_policy); 2522 if (err < 0) 2523 return err; 2524 slave_data = slave_attr; 2525 } 2526 if (m_ops->slave_validate) { 2527 err = m_ops->slave_validate(tb, slave_data); 2528 if (err < 0) 2529 return err; 2530 } 2531 } 2532 2533 if (dev) { 2534 int status = 0; 2535 2536 if (nlh->nlmsg_flags & NLM_F_EXCL) 2537 return -EEXIST; 2538 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2539 return -EOPNOTSUPP; 2540 2541 if (linkinfo[IFLA_INFO_DATA]) { 2542 if (!ops || ops != dev->rtnl_link_ops || 2543 !ops->changelink) 2544 return -EOPNOTSUPP; 2545 2546 err = ops->changelink(dev, tb, data); 2547 if (err < 0) 2548 return err; 2549 status |= DO_SETLINK_NOTIFY; 2550 } 2551 2552 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2553 if (!m_ops || !m_ops->slave_changelink) 2554 return -EOPNOTSUPP; 2555 2556 err = m_ops->slave_changelink(master_dev, dev, 2557 tb, slave_data); 2558 if (err < 0) 2559 return err; 2560 status |= DO_SETLINK_NOTIFY; 2561 } 2562 2563 return do_setlink(skb, dev, ifm, tb, ifname, status); 2564 } 2565 2566 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2567 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2568 return rtnl_group_changelink(skb, net, 2569 nla_get_u32(tb[IFLA_GROUP]), 2570 ifm, tb); 2571 return -ENODEV; 2572 } 2573 2574 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2575 return -EOPNOTSUPP; 2576 2577 if (!ops) { 2578 #ifdef CONFIG_MODULES 2579 if (kind[0]) { 2580 __rtnl_unlock(); 2581 request_module("rtnl-link-%s", kind); 2582 rtnl_lock(); 2583 ops = rtnl_link_ops_get(kind); 2584 if (ops) 2585 goto replay; 2586 } 2587 #endif 2588 return -EOPNOTSUPP; 2589 } 2590 2591 if (!ops->setup) 2592 return -EOPNOTSUPP; 2593 2594 if (!ifname[0]) { 2595 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2596 name_assign_type = NET_NAME_ENUM; 2597 } 2598 2599 dest_net = rtnl_link_get_net(net, tb); 2600 if (IS_ERR(dest_net)) 2601 return PTR_ERR(dest_net); 2602 2603 err = -EPERM; 2604 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2605 goto out; 2606 2607 if (tb[IFLA_LINK_NETNSID]) { 2608 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2609 2610 link_net = get_net_ns_by_id(dest_net, id); 2611 if (!link_net) { 2612 err = -EINVAL; 2613 goto out; 2614 } 2615 err = -EPERM; 2616 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2617 goto out; 2618 } 2619 2620 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2621 name_assign_type, ops, tb); 2622 if (IS_ERR(dev)) { 2623 err = PTR_ERR(dev); 2624 goto out; 2625 } 2626 2627 dev->ifindex = ifm->ifi_index; 2628 2629 if (ops->newlink) { 2630 err = ops->newlink(link_net ? : net, dev, tb, data); 2631 /* Drivers should call free_netdev() in ->destructor 2632 * and unregister it on failure after registration 2633 * so that device could be finally freed in rtnl_unlock. 2634 */ 2635 if (err < 0) { 2636 /* If device is not registered at all, free it now */ 2637 if (dev->reg_state == NETREG_UNINITIALIZED) 2638 free_netdev(dev); 2639 goto out; 2640 } 2641 } else { 2642 err = register_netdevice(dev); 2643 if (err < 0) { 2644 free_netdev(dev); 2645 goto out; 2646 } 2647 } 2648 err = rtnl_configure_link(dev, ifm); 2649 if (err < 0) 2650 goto out_unregister; 2651 if (link_net) { 2652 err = dev_change_net_namespace(dev, dest_net, ifname); 2653 if (err < 0) 2654 goto out_unregister; 2655 } 2656 out: 2657 if (link_net) 2658 put_net(link_net); 2659 put_net(dest_net); 2660 return err; 2661 out_unregister: 2662 if (ops->newlink) { 2663 LIST_HEAD(list_kill); 2664 2665 ops->dellink(dev, &list_kill); 2666 unregister_netdevice_many(&list_kill); 2667 } else { 2668 unregister_netdevice(dev); 2669 } 2670 goto out; 2671 } 2672 } 2673 2674 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2675 { 2676 struct net *net = sock_net(skb->sk); 2677 struct ifinfomsg *ifm; 2678 char ifname[IFNAMSIZ]; 2679 struct nlattr *tb[IFLA_MAX+1]; 2680 struct net_device *dev = NULL; 2681 struct sk_buff *nskb; 2682 int err; 2683 u32 ext_filter_mask = 0; 2684 2685 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2686 if (err < 0) 2687 return err; 2688 2689 if (tb[IFLA_IFNAME]) 2690 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2691 2692 if (tb[IFLA_EXT_MASK]) 2693 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2694 2695 ifm = nlmsg_data(nlh); 2696 if (ifm->ifi_index > 0) 2697 dev = __dev_get_by_index(net, ifm->ifi_index); 2698 else if (tb[IFLA_IFNAME]) 2699 dev = __dev_get_by_name(net, ifname); 2700 else 2701 return -EINVAL; 2702 2703 if (dev == NULL) 2704 return -ENODEV; 2705 2706 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2707 if (nskb == NULL) 2708 return -ENOBUFS; 2709 2710 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2711 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2712 if (err < 0) { 2713 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2714 WARN_ON(err == -EMSGSIZE); 2715 kfree_skb(nskb); 2716 } else 2717 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2718 2719 return err; 2720 } 2721 2722 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2723 { 2724 struct net *net = sock_net(skb->sk); 2725 struct net_device *dev; 2726 struct nlattr *tb[IFLA_MAX+1]; 2727 u32 ext_filter_mask = 0; 2728 u16 min_ifinfo_dump_size = 0; 2729 int hdrlen; 2730 2731 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2732 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2733 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2734 2735 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2736 if (tb[IFLA_EXT_MASK]) 2737 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2738 } 2739 2740 if (!ext_filter_mask) 2741 return NLMSG_GOODSIZE; 2742 /* 2743 * traverse the list of net devices and compute the minimum 2744 * buffer size based upon the filter mask. 2745 */ 2746 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2747 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2748 if_nlmsg_size(dev, 2749 ext_filter_mask)); 2750 } 2751 2752 return nlmsg_total_size(min_ifinfo_dump_size); 2753 } 2754 2755 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2756 { 2757 int idx; 2758 int s_idx = cb->family; 2759 2760 if (s_idx == 0) 2761 s_idx = 1; 2762 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2763 int type = cb->nlh->nlmsg_type-RTM_BASE; 2764 if (idx < s_idx || idx == PF_PACKET) 2765 continue; 2766 if (rtnl_msg_handlers[idx] == NULL || 2767 rtnl_msg_handlers[idx][type].dumpit == NULL) 2768 continue; 2769 if (idx > s_idx) { 2770 memset(&cb->args[0], 0, sizeof(cb->args)); 2771 cb->prev_seq = 0; 2772 cb->seq = 0; 2773 } 2774 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2775 break; 2776 } 2777 cb->family = idx; 2778 2779 return skb->len; 2780 } 2781 2782 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2783 unsigned int change, gfp_t flags) 2784 { 2785 struct net *net = dev_net(dev); 2786 struct sk_buff *skb; 2787 int err = -ENOBUFS; 2788 size_t if_info_size; 2789 2790 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2791 if (skb == NULL) 2792 goto errout; 2793 2794 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2795 if (err < 0) { 2796 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2797 WARN_ON(err == -EMSGSIZE); 2798 kfree_skb(skb); 2799 goto errout; 2800 } 2801 return skb; 2802 errout: 2803 if (err < 0) 2804 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2805 return NULL; 2806 } 2807 2808 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2809 { 2810 struct net *net = dev_net(dev); 2811 2812 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2813 } 2814 2815 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2816 gfp_t flags) 2817 { 2818 struct sk_buff *skb; 2819 2820 if (dev->reg_state != NETREG_REGISTERED) 2821 return; 2822 2823 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2824 if (skb) 2825 rtmsg_ifinfo_send(skb, dev, flags); 2826 } 2827 EXPORT_SYMBOL(rtmsg_ifinfo); 2828 2829 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2830 struct net_device *dev, 2831 u8 *addr, u16 vid, u32 pid, u32 seq, 2832 int type, unsigned int flags, 2833 int nlflags, u16 ndm_state) 2834 { 2835 struct nlmsghdr *nlh; 2836 struct ndmsg *ndm; 2837 2838 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2839 if (!nlh) 2840 return -EMSGSIZE; 2841 2842 ndm = nlmsg_data(nlh); 2843 ndm->ndm_family = AF_BRIDGE; 2844 ndm->ndm_pad1 = 0; 2845 ndm->ndm_pad2 = 0; 2846 ndm->ndm_flags = flags; 2847 ndm->ndm_type = 0; 2848 ndm->ndm_ifindex = dev->ifindex; 2849 ndm->ndm_state = ndm_state; 2850 2851 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2852 goto nla_put_failure; 2853 if (vid) 2854 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2855 goto nla_put_failure; 2856 2857 nlmsg_end(skb, nlh); 2858 return 0; 2859 2860 nla_put_failure: 2861 nlmsg_cancel(skb, nlh); 2862 return -EMSGSIZE; 2863 } 2864 2865 static inline size_t rtnl_fdb_nlmsg_size(void) 2866 { 2867 return NLMSG_ALIGN(sizeof(struct ndmsg)) + 2868 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */ 2869 nla_total_size(sizeof(u16)) + /* NDA_VLAN */ 2870 0; 2871 } 2872 2873 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 2874 u16 ndm_state) 2875 { 2876 struct net *net = dev_net(dev); 2877 struct sk_buff *skb; 2878 int err = -ENOBUFS; 2879 2880 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2881 if (!skb) 2882 goto errout; 2883 2884 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2885 0, 0, type, NTF_SELF, 0, ndm_state); 2886 if (err < 0) { 2887 kfree_skb(skb); 2888 goto errout; 2889 } 2890 2891 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2892 return; 2893 errout: 2894 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2895 } 2896 2897 /** 2898 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2899 */ 2900 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2901 struct nlattr *tb[], 2902 struct net_device *dev, 2903 const unsigned char *addr, u16 vid, 2904 u16 flags) 2905 { 2906 int err = -EINVAL; 2907 2908 /* If aging addresses are supported device will need to 2909 * implement its own handler for this. 2910 */ 2911 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2912 pr_info("%s: FDB only supports static addresses\n", dev->name); 2913 return err; 2914 } 2915 2916 if (vid) { 2917 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2918 return err; 2919 } 2920 2921 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2922 err = dev_uc_add_excl(dev, addr); 2923 else if (is_multicast_ether_addr(addr)) 2924 err = dev_mc_add_excl(dev, addr); 2925 2926 /* Only return duplicate errors if NLM_F_EXCL is set */ 2927 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2928 err = 0; 2929 2930 return err; 2931 } 2932 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2933 2934 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2935 { 2936 u16 vid = 0; 2937 2938 if (vlan_attr) { 2939 if (nla_len(vlan_attr) != sizeof(u16)) { 2940 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2941 return -EINVAL; 2942 } 2943 2944 vid = nla_get_u16(vlan_attr); 2945 2946 if (!vid || vid >= VLAN_VID_MASK) { 2947 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2948 vid); 2949 return -EINVAL; 2950 } 2951 } 2952 *p_vid = vid; 2953 return 0; 2954 } 2955 2956 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2957 { 2958 struct net *net = sock_net(skb->sk); 2959 struct ndmsg *ndm; 2960 struct nlattr *tb[NDA_MAX+1]; 2961 struct net_device *dev; 2962 u8 *addr; 2963 u16 vid; 2964 int err; 2965 2966 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2967 if (err < 0) 2968 return err; 2969 2970 ndm = nlmsg_data(nlh); 2971 if (ndm->ndm_ifindex == 0) { 2972 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2973 return -EINVAL; 2974 } 2975 2976 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2977 if (dev == NULL) { 2978 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2979 return -ENODEV; 2980 } 2981 2982 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2983 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2984 return -EINVAL; 2985 } 2986 2987 addr = nla_data(tb[NDA_LLADDR]); 2988 2989 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2990 if (err) 2991 return err; 2992 2993 err = -EOPNOTSUPP; 2994 2995 /* Support fdb on master device the net/bridge default case */ 2996 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2997 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2998 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2999 const struct net_device_ops *ops = br_dev->netdev_ops; 3000 3001 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 3002 nlh->nlmsg_flags); 3003 if (err) 3004 goto out; 3005 else 3006 ndm->ndm_flags &= ~NTF_MASTER; 3007 } 3008 3009 /* Embedded bridge, macvlan, and any other device support */ 3010 if ((ndm->ndm_flags & NTF_SELF)) { 3011 if (dev->netdev_ops->ndo_fdb_add) 3012 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 3013 vid, 3014 nlh->nlmsg_flags); 3015 else 3016 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 3017 nlh->nlmsg_flags); 3018 3019 if (!err) { 3020 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 3021 ndm->ndm_state); 3022 ndm->ndm_flags &= ~NTF_SELF; 3023 } 3024 } 3025 out: 3026 return err; 3027 } 3028 3029 /** 3030 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 3031 */ 3032 int ndo_dflt_fdb_del(struct ndmsg *ndm, 3033 struct nlattr *tb[], 3034 struct net_device *dev, 3035 const unsigned char *addr, u16 vid) 3036 { 3037 int err = -EINVAL; 3038 3039 /* If aging addresses are supported device will need to 3040 * implement its own handler for this. 3041 */ 3042 if (!(ndm->ndm_state & NUD_PERMANENT)) { 3043 pr_info("%s: FDB only supports static addresses\n", dev->name); 3044 return err; 3045 } 3046 3047 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 3048 err = dev_uc_del(dev, addr); 3049 else if (is_multicast_ether_addr(addr)) 3050 err = dev_mc_del(dev, addr); 3051 3052 return err; 3053 } 3054 EXPORT_SYMBOL(ndo_dflt_fdb_del); 3055 3056 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 3057 { 3058 struct net *net = sock_net(skb->sk); 3059 struct ndmsg *ndm; 3060 struct nlattr *tb[NDA_MAX+1]; 3061 struct net_device *dev; 3062 int err = -EINVAL; 3063 __u8 *addr; 3064 u16 vid; 3065 3066 if (!netlink_capable(skb, CAP_NET_ADMIN)) 3067 return -EPERM; 3068 3069 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 3070 if (err < 0) 3071 return err; 3072 3073 ndm = nlmsg_data(nlh); 3074 if (ndm->ndm_ifindex == 0) { 3075 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 3076 return -EINVAL; 3077 } 3078 3079 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 3080 if (dev == NULL) { 3081 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 3082 return -ENODEV; 3083 } 3084 3085 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 3086 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 3087 return -EINVAL; 3088 } 3089 3090 addr = nla_data(tb[NDA_LLADDR]); 3091 3092 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 3093 if (err) 3094 return err; 3095 3096 err = -EOPNOTSUPP; 3097 3098 /* Support fdb on master device the net/bridge default case */ 3099 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 3100 (dev->priv_flags & IFF_BRIDGE_PORT)) { 3101 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3102 const struct net_device_ops *ops = br_dev->netdev_ops; 3103 3104 if (ops->ndo_fdb_del) 3105 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 3106 3107 if (err) 3108 goto out; 3109 else 3110 ndm->ndm_flags &= ~NTF_MASTER; 3111 } 3112 3113 /* Embedded bridge, macvlan, and any other device support */ 3114 if (ndm->ndm_flags & NTF_SELF) { 3115 if (dev->netdev_ops->ndo_fdb_del) 3116 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 3117 vid); 3118 else 3119 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 3120 3121 if (!err) { 3122 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 3123 ndm->ndm_state); 3124 ndm->ndm_flags &= ~NTF_SELF; 3125 } 3126 } 3127 out: 3128 return err; 3129 } 3130 3131 static int nlmsg_populate_fdb(struct sk_buff *skb, 3132 struct netlink_callback *cb, 3133 struct net_device *dev, 3134 int *idx, 3135 struct netdev_hw_addr_list *list) 3136 { 3137 struct netdev_hw_addr *ha; 3138 int err; 3139 u32 portid, seq; 3140 3141 portid = NETLINK_CB(cb->skb).portid; 3142 seq = cb->nlh->nlmsg_seq; 3143 3144 list_for_each_entry(ha, &list->list, list) { 3145 if (*idx < cb->args[2]) 3146 goto skip; 3147 3148 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 3149 portid, seq, 3150 RTM_NEWNEIGH, NTF_SELF, 3151 NLM_F_MULTI, NUD_PERMANENT); 3152 if (err < 0) 3153 return err; 3154 skip: 3155 *idx += 1; 3156 } 3157 return 0; 3158 } 3159 3160 /** 3161 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 3162 * @nlh: netlink message header 3163 * @dev: netdevice 3164 * 3165 * Default netdevice operation to dump the existing unicast address list. 3166 * Returns number of addresses from list put in skb. 3167 */ 3168 int ndo_dflt_fdb_dump(struct sk_buff *skb, 3169 struct netlink_callback *cb, 3170 struct net_device *dev, 3171 struct net_device *filter_dev, 3172 int *idx) 3173 { 3174 int err; 3175 3176 netif_addr_lock_bh(dev); 3177 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc); 3178 if (err) 3179 goto out; 3180 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc); 3181 out: 3182 netif_addr_unlock_bh(dev); 3183 return err; 3184 } 3185 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 3186 3187 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 3188 { 3189 struct net_device *dev; 3190 struct nlattr *tb[IFLA_MAX+1]; 3191 struct net_device *br_dev = NULL; 3192 const struct net_device_ops *ops = NULL; 3193 const struct net_device_ops *cops = NULL; 3194 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 3195 struct net *net = sock_net(skb->sk); 3196 struct hlist_head *head; 3197 int brport_idx = 0; 3198 int br_idx = 0; 3199 int h, s_h; 3200 int idx = 0, s_idx; 3201 int err = 0; 3202 int fidx = 0; 3203 3204 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 3205 ifla_policy) == 0) { 3206 if (tb[IFLA_MASTER]) 3207 br_idx = nla_get_u32(tb[IFLA_MASTER]); 3208 } 3209 3210 brport_idx = ifm->ifi_index; 3211 3212 if (br_idx) { 3213 br_dev = __dev_get_by_index(net, br_idx); 3214 if (!br_dev) 3215 return -ENODEV; 3216 3217 ops = br_dev->netdev_ops; 3218 } 3219 3220 s_h = cb->args[0]; 3221 s_idx = cb->args[1]; 3222 3223 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3224 idx = 0; 3225 head = &net->dev_index_head[h]; 3226 hlist_for_each_entry(dev, head, index_hlist) { 3227 3228 if (brport_idx && (dev->ifindex != brport_idx)) 3229 continue; 3230 3231 if (!br_idx) { /* user did not specify a specific bridge */ 3232 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3233 br_dev = netdev_master_upper_dev_get(dev); 3234 cops = br_dev->netdev_ops; 3235 } 3236 } else { 3237 if (dev != br_dev && 3238 !(dev->priv_flags & IFF_BRIDGE_PORT)) 3239 continue; 3240 3241 if (br_dev != netdev_master_upper_dev_get(dev) && 3242 !(dev->priv_flags & IFF_EBRIDGE)) 3243 continue; 3244 cops = ops; 3245 } 3246 3247 if (idx < s_idx) 3248 goto cont; 3249 3250 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3251 if (cops && cops->ndo_fdb_dump) { 3252 err = cops->ndo_fdb_dump(skb, cb, 3253 br_dev, dev, 3254 &fidx); 3255 if (err == -EMSGSIZE) 3256 goto out; 3257 } 3258 } 3259 3260 if (dev->netdev_ops->ndo_fdb_dump) 3261 err = dev->netdev_ops->ndo_fdb_dump(skb, cb, 3262 dev, NULL, 3263 &fidx); 3264 else 3265 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, 3266 &fidx); 3267 if (err == -EMSGSIZE) 3268 goto out; 3269 3270 cops = NULL; 3271 3272 /* reset fdb offset to 0 for rest of the interfaces */ 3273 cb->args[2] = 0; 3274 fidx = 0; 3275 cont: 3276 idx++; 3277 } 3278 } 3279 3280 out: 3281 cb->args[0] = h; 3282 cb->args[1] = idx; 3283 cb->args[2] = fidx; 3284 3285 return skb->len; 3286 } 3287 3288 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 3289 unsigned int attrnum, unsigned int flag) 3290 { 3291 if (mask & flag) 3292 return nla_put_u8(skb, attrnum, !!(flags & flag)); 3293 return 0; 3294 } 3295 3296 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 3297 struct net_device *dev, u16 mode, 3298 u32 flags, u32 mask, int nlflags, 3299 u32 filter_mask, 3300 int (*vlan_fill)(struct sk_buff *skb, 3301 struct net_device *dev, 3302 u32 filter_mask)) 3303 { 3304 struct nlmsghdr *nlh; 3305 struct ifinfomsg *ifm; 3306 struct nlattr *br_afspec; 3307 struct nlattr *protinfo; 3308 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 3309 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3310 int err = 0; 3311 3312 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 3313 if (nlh == NULL) 3314 return -EMSGSIZE; 3315 3316 ifm = nlmsg_data(nlh); 3317 ifm->ifi_family = AF_BRIDGE; 3318 ifm->__ifi_pad = 0; 3319 ifm->ifi_type = dev->type; 3320 ifm->ifi_index = dev->ifindex; 3321 ifm->ifi_flags = dev_get_flags(dev); 3322 ifm->ifi_change = 0; 3323 3324 3325 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 3326 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 3327 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 3328 (br_dev && 3329 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 3330 (dev->addr_len && 3331 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 3332 (dev->ifindex != dev_get_iflink(dev) && 3333 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 3334 goto nla_put_failure; 3335 3336 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 3337 if (!br_afspec) 3338 goto nla_put_failure; 3339 3340 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 3341 nla_nest_cancel(skb, br_afspec); 3342 goto nla_put_failure; 3343 } 3344 3345 if (mode != BRIDGE_MODE_UNDEF) { 3346 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 3347 nla_nest_cancel(skb, br_afspec); 3348 goto nla_put_failure; 3349 } 3350 } 3351 if (vlan_fill) { 3352 err = vlan_fill(skb, dev, filter_mask); 3353 if (err) { 3354 nla_nest_cancel(skb, br_afspec); 3355 goto nla_put_failure; 3356 } 3357 } 3358 nla_nest_end(skb, br_afspec); 3359 3360 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 3361 if (!protinfo) 3362 goto nla_put_failure; 3363 3364 if (brport_nla_put_flag(skb, flags, mask, 3365 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 3366 brport_nla_put_flag(skb, flags, mask, 3367 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 3368 brport_nla_put_flag(skb, flags, mask, 3369 IFLA_BRPORT_FAST_LEAVE, 3370 BR_MULTICAST_FAST_LEAVE) || 3371 brport_nla_put_flag(skb, flags, mask, 3372 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 3373 brport_nla_put_flag(skb, flags, mask, 3374 IFLA_BRPORT_LEARNING, BR_LEARNING) || 3375 brport_nla_put_flag(skb, flags, mask, 3376 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 3377 brport_nla_put_flag(skb, flags, mask, 3378 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3379 brport_nla_put_flag(skb, flags, mask, 3380 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3381 nla_nest_cancel(skb, protinfo); 3382 goto nla_put_failure; 3383 } 3384 3385 nla_nest_end(skb, protinfo); 3386 3387 nlmsg_end(skb, nlh); 3388 return 0; 3389 nla_put_failure: 3390 nlmsg_cancel(skb, nlh); 3391 return err ? err : -EMSGSIZE; 3392 } 3393 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3394 3395 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3396 { 3397 struct net *net = sock_net(skb->sk); 3398 struct net_device *dev; 3399 int idx = 0; 3400 u32 portid = NETLINK_CB(cb->skb).portid; 3401 u32 seq = cb->nlh->nlmsg_seq; 3402 u32 filter_mask = 0; 3403 int err; 3404 3405 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3406 struct nlattr *extfilt; 3407 3408 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3409 IFLA_EXT_MASK); 3410 if (extfilt) { 3411 if (nla_len(extfilt) < sizeof(filter_mask)) 3412 return -EINVAL; 3413 3414 filter_mask = nla_get_u32(extfilt); 3415 } 3416 } 3417 3418 rcu_read_lock(); 3419 for_each_netdev_rcu(net, dev) { 3420 const struct net_device_ops *ops = dev->netdev_ops; 3421 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3422 3423 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3424 if (idx >= cb->args[0]) { 3425 err = br_dev->netdev_ops->ndo_bridge_getlink( 3426 skb, portid, seq, dev, 3427 filter_mask, NLM_F_MULTI); 3428 if (err < 0 && err != -EOPNOTSUPP) 3429 break; 3430 } 3431 idx++; 3432 } 3433 3434 if (ops->ndo_bridge_getlink) { 3435 if (idx >= cb->args[0]) { 3436 err = ops->ndo_bridge_getlink(skb, portid, 3437 seq, dev, 3438 filter_mask, 3439 NLM_F_MULTI); 3440 if (err < 0 && err != -EOPNOTSUPP) 3441 break; 3442 } 3443 idx++; 3444 } 3445 } 3446 rcu_read_unlock(); 3447 cb->args[0] = idx; 3448 3449 return skb->len; 3450 } 3451 3452 static inline size_t bridge_nlmsg_size(void) 3453 { 3454 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3455 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3456 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3457 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3458 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3459 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3460 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3461 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3462 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3463 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3464 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3465 } 3466 3467 static int rtnl_bridge_notify(struct net_device *dev) 3468 { 3469 struct net *net = dev_net(dev); 3470 struct sk_buff *skb; 3471 int err = -EOPNOTSUPP; 3472 3473 if (!dev->netdev_ops->ndo_bridge_getlink) 3474 return 0; 3475 3476 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3477 if (!skb) { 3478 err = -ENOMEM; 3479 goto errout; 3480 } 3481 3482 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3483 if (err < 0) 3484 goto errout; 3485 3486 if (!skb->len) 3487 goto errout; 3488 3489 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3490 return 0; 3491 errout: 3492 WARN_ON(err == -EMSGSIZE); 3493 kfree_skb(skb); 3494 if (err) 3495 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3496 return err; 3497 } 3498 3499 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3500 { 3501 struct net *net = sock_net(skb->sk); 3502 struct ifinfomsg *ifm; 3503 struct net_device *dev; 3504 struct nlattr *br_spec, *attr = NULL; 3505 int rem, err = -EOPNOTSUPP; 3506 u16 flags = 0; 3507 bool have_flags = false; 3508 3509 if (nlmsg_len(nlh) < sizeof(*ifm)) 3510 return -EINVAL; 3511 3512 ifm = nlmsg_data(nlh); 3513 if (ifm->ifi_family != AF_BRIDGE) 3514 return -EPFNOSUPPORT; 3515 3516 dev = __dev_get_by_index(net, ifm->ifi_index); 3517 if (!dev) { 3518 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3519 return -ENODEV; 3520 } 3521 3522 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3523 if (br_spec) { 3524 nla_for_each_nested(attr, br_spec, rem) { 3525 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3526 if (nla_len(attr) < sizeof(flags)) 3527 return -EINVAL; 3528 3529 have_flags = true; 3530 flags = nla_get_u16(attr); 3531 break; 3532 } 3533 } 3534 } 3535 3536 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3537 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3538 3539 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3540 err = -EOPNOTSUPP; 3541 goto out; 3542 } 3543 3544 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3545 if (err) 3546 goto out; 3547 3548 flags &= ~BRIDGE_FLAGS_MASTER; 3549 } 3550 3551 if ((flags & BRIDGE_FLAGS_SELF)) { 3552 if (!dev->netdev_ops->ndo_bridge_setlink) 3553 err = -EOPNOTSUPP; 3554 else 3555 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3556 flags); 3557 if (!err) { 3558 flags &= ~BRIDGE_FLAGS_SELF; 3559 3560 /* Generate event to notify upper layer of bridge 3561 * change 3562 */ 3563 err = rtnl_bridge_notify(dev); 3564 } 3565 } 3566 3567 if (have_flags) 3568 memcpy(nla_data(attr), &flags, sizeof(flags)); 3569 out: 3570 return err; 3571 } 3572 3573 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3574 { 3575 struct net *net = sock_net(skb->sk); 3576 struct ifinfomsg *ifm; 3577 struct net_device *dev; 3578 struct nlattr *br_spec, *attr = NULL; 3579 int rem, err = -EOPNOTSUPP; 3580 u16 flags = 0; 3581 bool have_flags = false; 3582 3583 if (nlmsg_len(nlh) < sizeof(*ifm)) 3584 return -EINVAL; 3585 3586 ifm = nlmsg_data(nlh); 3587 if (ifm->ifi_family != AF_BRIDGE) 3588 return -EPFNOSUPPORT; 3589 3590 dev = __dev_get_by_index(net, ifm->ifi_index); 3591 if (!dev) { 3592 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3593 return -ENODEV; 3594 } 3595 3596 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3597 if (br_spec) { 3598 nla_for_each_nested(attr, br_spec, rem) { 3599 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3600 if (nla_len(attr) < sizeof(flags)) 3601 return -EINVAL; 3602 3603 have_flags = true; 3604 flags = nla_get_u16(attr); 3605 break; 3606 } 3607 } 3608 } 3609 3610 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3611 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3612 3613 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3614 err = -EOPNOTSUPP; 3615 goto out; 3616 } 3617 3618 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3619 if (err) 3620 goto out; 3621 3622 flags &= ~BRIDGE_FLAGS_MASTER; 3623 } 3624 3625 if ((flags & BRIDGE_FLAGS_SELF)) { 3626 if (!dev->netdev_ops->ndo_bridge_dellink) 3627 err = -EOPNOTSUPP; 3628 else 3629 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3630 flags); 3631 3632 if (!err) { 3633 flags &= ~BRIDGE_FLAGS_SELF; 3634 3635 /* Generate event to notify upper layer of bridge 3636 * change 3637 */ 3638 err = rtnl_bridge_notify(dev); 3639 } 3640 } 3641 3642 if (have_flags) 3643 memcpy(nla_data(attr), &flags, sizeof(flags)); 3644 out: 3645 return err; 3646 } 3647 3648 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr) 3649 { 3650 return (mask & IFLA_STATS_FILTER_BIT(attrid)) && 3651 (!idxattr || idxattr == attrid); 3652 } 3653 3654 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1) 3655 static int rtnl_get_offload_stats_attr_size(int attr_id) 3656 { 3657 switch (attr_id) { 3658 case IFLA_OFFLOAD_XSTATS_CPU_HIT: 3659 return sizeof(struct rtnl_link_stats64); 3660 } 3661 3662 return 0; 3663 } 3664 3665 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev, 3666 int *prividx) 3667 { 3668 struct nlattr *attr = NULL; 3669 int attr_id, size; 3670 void *attr_data; 3671 int err; 3672 3673 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 3674 dev->netdev_ops->ndo_get_offload_stats)) 3675 return -ENODATA; 3676 3677 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 3678 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 3679 if (attr_id < *prividx) 3680 continue; 3681 3682 size = rtnl_get_offload_stats_attr_size(attr_id); 3683 if (!size) 3684 continue; 3685 3686 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 3687 continue; 3688 3689 attr = nla_reserve_64bit(skb, attr_id, size, 3690 IFLA_OFFLOAD_XSTATS_UNSPEC); 3691 if (!attr) 3692 goto nla_put_failure; 3693 3694 attr_data = nla_data(attr); 3695 memset(attr_data, 0, size); 3696 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, 3697 attr_data); 3698 if (err) 3699 goto get_offload_stats_failure; 3700 } 3701 3702 if (!attr) 3703 return -ENODATA; 3704 3705 *prividx = 0; 3706 return 0; 3707 3708 nla_put_failure: 3709 err = -EMSGSIZE; 3710 get_offload_stats_failure: 3711 *prividx = attr_id; 3712 return err; 3713 } 3714 3715 static int rtnl_get_offload_stats_size(const struct net_device *dev) 3716 { 3717 int nla_size = 0; 3718 int attr_id; 3719 int size; 3720 3721 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats && 3722 dev->netdev_ops->ndo_get_offload_stats)) 3723 return 0; 3724 3725 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST; 3726 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) { 3727 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id)) 3728 continue; 3729 size = rtnl_get_offload_stats_attr_size(attr_id); 3730 nla_size += nla_total_size_64bit(size); 3731 } 3732 3733 if (nla_size != 0) 3734 nla_size += nla_total_size(0); 3735 3736 return nla_size; 3737 } 3738 3739 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, 3740 int type, u32 pid, u32 seq, u32 change, 3741 unsigned int flags, unsigned int filter_mask, 3742 int *idxattr, int *prividx) 3743 { 3744 struct if_stats_msg *ifsm; 3745 struct nlmsghdr *nlh; 3746 struct nlattr *attr; 3747 int s_prividx = *prividx; 3748 int err; 3749 3750 ASSERT_RTNL(); 3751 3752 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags); 3753 if (!nlh) 3754 return -EMSGSIZE; 3755 3756 ifsm = nlmsg_data(nlh); 3757 ifsm->ifindex = dev->ifindex; 3758 ifsm->filter_mask = filter_mask; 3759 3760 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) { 3761 struct rtnl_link_stats64 *sp; 3762 3763 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64, 3764 sizeof(struct rtnl_link_stats64), 3765 IFLA_STATS_UNSPEC); 3766 if (!attr) 3767 goto nla_put_failure; 3768 3769 sp = nla_data(attr); 3770 dev_get_stats(dev, sp); 3771 } 3772 3773 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) { 3774 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 3775 3776 if (ops && ops->fill_linkxstats) { 3777 *idxattr = IFLA_STATS_LINK_XSTATS; 3778 attr = nla_nest_start(skb, 3779 IFLA_STATS_LINK_XSTATS); 3780 if (!attr) 3781 goto nla_put_failure; 3782 3783 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 3784 nla_nest_end(skb, attr); 3785 if (err) 3786 goto nla_put_failure; 3787 *idxattr = 0; 3788 } 3789 } 3790 3791 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 3792 *idxattr)) { 3793 const struct rtnl_link_ops *ops = NULL; 3794 const struct net_device *master; 3795 3796 master = netdev_master_upper_dev_get(dev); 3797 if (master) 3798 ops = master->rtnl_link_ops; 3799 if (ops && ops->fill_linkxstats) { 3800 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE; 3801 attr = nla_nest_start(skb, 3802 IFLA_STATS_LINK_XSTATS_SLAVE); 3803 if (!attr) 3804 goto nla_put_failure; 3805 3806 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); 3807 nla_nest_end(skb, attr); 3808 if (err) 3809 goto nla_put_failure; 3810 *idxattr = 0; 3811 } 3812 } 3813 3814 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 3815 *idxattr)) { 3816 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS; 3817 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS); 3818 if (!attr) 3819 goto nla_put_failure; 3820 3821 err = rtnl_get_offload_stats(skb, dev, prividx); 3822 if (err == -ENODATA) 3823 nla_nest_cancel(skb, attr); 3824 else 3825 nla_nest_end(skb, attr); 3826 3827 if (err && err != -ENODATA) 3828 goto nla_put_failure; 3829 *idxattr = 0; 3830 } 3831 3832 nlmsg_end(skb, nlh); 3833 3834 return 0; 3835 3836 nla_put_failure: 3837 /* not a multi message or no progress mean a real error */ 3838 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx) 3839 nlmsg_cancel(skb, nlh); 3840 else 3841 nlmsg_end(skb, nlh); 3842 3843 return -EMSGSIZE; 3844 } 3845 3846 static size_t if_nlmsg_stats_size(const struct net_device *dev, 3847 u32 filter_mask) 3848 { 3849 size_t size = 0; 3850 3851 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0)) 3852 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64)); 3853 3854 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) { 3855 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 3856 int attr = IFLA_STATS_LINK_XSTATS; 3857 3858 if (ops && ops->get_linkxstats_size) { 3859 size += nla_total_size(ops->get_linkxstats_size(dev, 3860 attr)); 3861 /* for IFLA_STATS_LINK_XSTATS */ 3862 size += nla_total_size(0); 3863 } 3864 } 3865 3866 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) { 3867 struct net_device *_dev = (struct net_device *)dev; 3868 const struct rtnl_link_ops *ops = NULL; 3869 const struct net_device *master; 3870 3871 /* netdev_master_upper_dev_get can't take const */ 3872 master = netdev_master_upper_dev_get(_dev); 3873 if (master) 3874 ops = master->rtnl_link_ops; 3875 if (ops && ops->get_linkxstats_size) { 3876 int attr = IFLA_STATS_LINK_XSTATS_SLAVE; 3877 3878 size += nla_total_size(ops->get_linkxstats_size(dev, 3879 attr)); 3880 /* for IFLA_STATS_LINK_XSTATS_SLAVE */ 3881 size += nla_total_size(0); 3882 } 3883 } 3884 3885 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) 3886 size += rtnl_get_offload_stats_size(dev); 3887 3888 return size; 3889 } 3890 3891 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh) 3892 { 3893 struct net *net = sock_net(skb->sk); 3894 struct net_device *dev = NULL; 3895 int idxattr = 0, prividx = 0; 3896 struct if_stats_msg *ifsm; 3897 struct sk_buff *nskb; 3898 u32 filter_mask; 3899 int err; 3900 3901 if (nlmsg_len(nlh) < sizeof(*ifsm)) 3902 return -EINVAL; 3903 3904 ifsm = nlmsg_data(nlh); 3905 if (ifsm->ifindex > 0) 3906 dev = __dev_get_by_index(net, ifsm->ifindex); 3907 else 3908 return -EINVAL; 3909 3910 if (!dev) 3911 return -ENODEV; 3912 3913 filter_mask = ifsm->filter_mask; 3914 if (!filter_mask) 3915 return -EINVAL; 3916 3917 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL); 3918 if (!nskb) 3919 return -ENOBUFS; 3920 3921 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS, 3922 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 3923 0, filter_mask, &idxattr, &prividx); 3924 if (err < 0) { 3925 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */ 3926 WARN_ON(err == -EMSGSIZE); 3927 kfree_skb(nskb); 3928 } else { 3929 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 3930 } 3931 3932 return err; 3933 } 3934 3935 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb) 3936 { 3937 int h, s_h, err, s_idx, s_idxattr, s_prividx; 3938 struct net *net = sock_net(skb->sk); 3939 unsigned int flags = NLM_F_MULTI; 3940 struct if_stats_msg *ifsm; 3941 struct hlist_head *head; 3942 struct net_device *dev; 3943 u32 filter_mask = 0; 3944 int idx = 0; 3945 3946 s_h = cb->args[0]; 3947 s_idx = cb->args[1]; 3948 s_idxattr = cb->args[2]; 3949 s_prividx = cb->args[3]; 3950 3951 cb->seq = net->dev_base_seq; 3952 3953 if (nlmsg_len(cb->nlh) < sizeof(*ifsm)) 3954 return -EINVAL; 3955 3956 ifsm = nlmsg_data(cb->nlh); 3957 filter_mask = ifsm->filter_mask; 3958 if (!filter_mask) 3959 return -EINVAL; 3960 3961 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3962 idx = 0; 3963 head = &net->dev_index_head[h]; 3964 hlist_for_each_entry(dev, head, index_hlist) { 3965 if (idx < s_idx) 3966 goto cont; 3967 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 3968 NETLINK_CB(cb->skb).portid, 3969 cb->nlh->nlmsg_seq, 0, 3970 flags, filter_mask, 3971 &s_idxattr, &s_prividx); 3972 /* If we ran out of room on the first message, 3973 * we're in trouble 3974 */ 3975 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 3976 3977 if (err < 0) 3978 goto out; 3979 s_prividx = 0; 3980 s_idxattr = 0; 3981 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3982 cont: 3983 idx++; 3984 } 3985 } 3986 out: 3987 cb->args[3] = s_prividx; 3988 cb->args[2] = s_idxattr; 3989 cb->args[1] = idx; 3990 cb->args[0] = h; 3991 3992 return skb->len; 3993 } 3994 3995 /* Process one rtnetlink message. */ 3996 3997 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3998 { 3999 struct net *net = sock_net(skb->sk); 4000 rtnl_doit_func doit; 4001 int kind; 4002 int family; 4003 int type; 4004 int err; 4005 4006 type = nlh->nlmsg_type; 4007 if (type > RTM_MAX) 4008 return -EOPNOTSUPP; 4009 4010 type -= RTM_BASE; 4011 4012 /* All the messages must have at least 1 byte length */ 4013 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 4014 return 0; 4015 4016 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 4017 kind = type&3; 4018 4019 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 4020 return -EPERM; 4021 4022 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 4023 struct sock *rtnl; 4024 rtnl_dumpit_func dumpit; 4025 rtnl_calcit_func calcit; 4026 u16 min_dump_alloc = 0; 4027 4028 dumpit = rtnl_get_dumpit(family, type); 4029 if (dumpit == NULL) 4030 return -EOPNOTSUPP; 4031 calcit = rtnl_get_calcit(family, type); 4032 if (calcit) 4033 min_dump_alloc = calcit(skb, nlh); 4034 4035 __rtnl_unlock(); 4036 rtnl = net->rtnl; 4037 { 4038 struct netlink_dump_control c = { 4039 .dump = dumpit, 4040 .min_dump_alloc = min_dump_alloc, 4041 }; 4042 err = netlink_dump_start(rtnl, skb, nlh, &c); 4043 } 4044 rtnl_lock(); 4045 return err; 4046 } 4047 4048 doit = rtnl_get_doit(family, type); 4049 if (doit == NULL) 4050 return -EOPNOTSUPP; 4051 4052 return doit(skb, nlh); 4053 } 4054 4055 static void rtnetlink_rcv(struct sk_buff *skb) 4056 { 4057 rtnl_lock(); 4058 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 4059 rtnl_unlock(); 4060 } 4061 4062 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 4063 { 4064 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4065 4066 switch (event) { 4067 case NETDEV_UP: 4068 case NETDEV_DOWN: 4069 case NETDEV_PRE_UP: 4070 case NETDEV_POST_INIT: 4071 case NETDEV_REGISTER: 4072 case NETDEV_CHANGE: 4073 case NETDEV_PRE_TYPE_CHANGE: 4074 case NETDEV_GOING_DOWN: 4075 case NETDEV_UNREGISTER: 4076 case NETDEV_UNREGISTER_FINAL: 4077 case NETDEV_RELEASE: 4078 case NETDEV_JOIN: 4079 case NETDEV_BONDING_INFO: 4080 break; 4081 default: 4082 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 4083 break; 4084 } 4085 return NOTIFY_DONE; 4086 } 4087 4088 static struct notifier_block rtnetlink_dev_notifier = { 4089 .notifier_call = rtnetlink_event, 4090 }; 4091 4092 4093 static int __net_init rtnetlink_net_init(struct net *net) 4094 { 4095 struct sock *sk; 4096 struct netlink_kernel_cfg cfg = { 4097 .groups = RTNLGRP_MAX, 4098 .input = rtnetlink_rcv, 4099 .cb_mutex = &rtnl_mutex, 4100 .flags = NL_CFG_F_NONROOT_RECV, 4101 }; 4102 4103 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 4104 if (!sk) 4105 return -ENOMEM; 4106 net->rtnl = sk; 4107 return 0; 4108 } 4109 4110 static void __net_exit rtnetlink_net_exit(struct net *net) 4111 { 4112 netlink_kernel_release(net->rtnl); 4113 net->rtnl = NULL; 4114 } 4115 4116 static struct pernet_operations rtnetlink_net_ops = { 4117 .init = rtnetlink_net_init, 4118 .exit = rtnetlink_net_exit, 4119 }; 4120 4121 void __init rtnetlink_init(void) 4122 { 4123 if (register_pernet_subsys(&rtnetlink_net_ops)) 4124 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 4125 4126 register_netdevice_notifier(&rtnetlink_dev_notifier); 4127 4128 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 4129 rtnl_dump_ifinfo, rtnl_calcit); 4130 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 4131 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 4132 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 4133 4134 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 4135 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 4136 4137 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 4138 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 4139 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 4140 4141 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 4142 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 4143 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 4144 4145 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump, 4146 NULL); 4147 } 4148