1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/slab.h> 31 #include <linux/interrupt.h> 32 #include <linux/capability.h> 33 #include <linux/skbuff.h> 34 #include <linux/init.h> 35 #include <linux/security.h> 36 #include <linux/mutex.h> 37 #include <linux/if_addr.h> 38 #include <linux/if_bridge.h> 39 #include <linux/if_vlan.h> 40 #include <linux/pci.h> 41 #include <linux/etherdevice.h> 42 43 #include <asm/uaccess.h> 44 45 #include <linux/inet.h> 46 #include <linux/netdevice.h> 47 #include <net/switchdev.h> 48 #include <net/ip.h> 49 #include <net/protocol.h> 50 #include <net/arp.h> 51 #include <net/route.h> 52 #include <net/udp.h> 53 #include <net/tcp.h> 54 #include <net/sock.h> 55 #include <net/pkt_sched.h> 56 #include <net/fib_rules.h> 57 #include <net/rtnetlink.h> 58 #include <net/net_namespace.h> 59 60 struct rtnl_link { 61 rtnl_doit_func doit; 62 rtnl_dumpit_func dumpit; 63 rtnl_calcit_func calcit; 64 }; 65 66 static DEFINE_MUTEX(rtnl_mutex); 67 68 void rtnl_lock(void) 69 { 70 mutex_lock(&rtnl_mutex); 71 } 72 EXPORT_SYMBOL(rtnl_lock); 73 74 void __rtnl_unlock(void) 75 { 76 mutex_unlock(&rtnl_mutex); 77 } 78 79 void rtnl_unlock(void) 80 { 81 /* This fellow will unlock it for us. */ 82 netdev_run_todo(); 83 } 84 EXPORT_SYMBOL(rtnl_unlock); 85 86 int rtnl_trylock(void) 87 { 88 return mutex_trylock(&rtnl_mutex); 89 } 90 EXPORT_SYMBOL(rtnl_trylock); 91 92 int rtnl_is_locked(void) 93 { 94 return mutex_is_locked(&rtnl_mutex); 95 } 96 EXPORT_SYMBOL(rtnl_is_locked); 97 98 #ifdef CONFIG_PROVE_LOCKING 99 int lockdep_rtnl_is_held(void) 100 { 101 return lockdep_is_held(&rtnl_mutex); 102 } 103 EXPORT_SYMBOL(lockdep_rtnl_is_held); 104 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 105 106 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 107 108 static inline int rtm_msgindex(int msgtype) 109 { 110 int msgindex = msgtype - RTM_BASE; 111 112 /* 113 * msgindex < 0 implies someone tried to register a netlink 114 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 115 * the message type has not been added to linux/rtnetlink.h 116 */ 117 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 118 119 return msgindex; 120 } 121 122 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 123 { 124 struct rtnl_link *tab; 125 126 if (protocol <= RTNL_FAMILY_MAX) 127 tab = rtnl_msg_handlers[protocol]; 128 else 129 tab = NULL; 130 131 if (tab == NULL || tab[msgindex].doit == NULL) 132 tab = rtnl_msg_handlers[PF_UNSPEC]; 133 134 return tab[msgindex].doit; 135 } 136 137 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 138 { 139 struct rtnl_link *tab; 140 141 if (protocol <= RTNL_FAMILY_MAX) 142 tab = rtnl_msg_handlers[protocol]; 143 else 144 tab = NULL; 145 146 if (tab == NULL || tab[msgindex].dumpit == NULL) 147 tab = rtnl_msg_handlers[PF_UNSPEC]; 148 149 return tab[msgindex].dumpit; 150 } 151 152 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 153 { 154 struct rtnl_link *tab; 155 156 if (protocol <= RTNL_FAMILY_MAX) 157 tab = rtnl_msg_handlers[protocol]; 158 else 159 tab = NULL; 160 161 if (tab == NULL || tab[msgindex].calcit == NULL) 162 tab = rtnl_msg_handlers[PF_UNSPEC]; 163 164 return tab[msgindex].calcit; 165 } 166 167 /** 168 * __rtnl_register - Register a rtnetlink message type 169 * @protocol: Protocol family or PF_UNSPEC 170 * @msgtype: rtnetlink message type 171 * @doit: Function pointer called for each request message 172 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 173 * @calcit: Function pointer to calc size of dump message 174 * 175 * Registers the specified function pointers (at least one of them has 176 * to be non-NULL) to be called whenever a request message for the 177 * specified protocol family and message type is received. 178 * 179 * The special protocol family PF_UNSPEC may be used to define fallback 180 * function pointers for the case when no entry for the specific protocol 181 * family exists. 182 * 183 * Returns 0 on success or a negative error code. 184 */ 185 int __rtnl_register(int protocol, int msgtype, 186 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 187 rtnl_calcit_func calcit) 188 { 189 struct rtnl_link *tab; 190 int msgindex; 191 192 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 193 msgindex = rtm_msgindex(msgtype); 194 195 tab = rtnl_msg_handlers[protocol]; 196 if (tab == NULL) { 197 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 198 if (tab == NULL) 199 return -ENOBUFS; 200 201 rtnl_msg_handlers[protocol] = tab; 202 } 203 204 if (doit) 205 tab[msgindex].doit = doit; 206 207 if (dumpit) 208 tab[msgindex].dumpit = dumpit; 209 210 if (calcit) 211 tab[msgindex].calcit = calcit; 212 213 return 0; 214 } 215 EXPORT_SYMBOL_GPL(__rtnl_register); 216 217 /** 218 * rtnl_register - Register a rtnetlink message type 219 * 220 * Identical to __rtnl_register() but panics on failure. This is useful 221 * as failure of this function is very unlikely, it can only happen due 222 * to lack of memory when allocating the chain to store all message 223 * handlers for a protocol. Meant for use in init functions where lack 224 * of memory implies no sense in continuing. 225 */ 226 void rtnl_register(int protocol, int msgtype, 227 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 228 rtnl_calcit_func calcit) 229 { 230 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 231 panic("Unable to register rtnetlink message handler, " 232 "protocol = %d, message type = %d\n", 233 protocol, msgtype); 234 } 235 EXPORT_SYMBOL_GPL(rtnl_register); 236 237 /** 238 * rtnl_unregister - Unregister a rtnetlink message type 239 * @protocol: Protocol family or PF_UNSPEC 240 * @msgtype: rtnetlink message type 241 * 242 * Returns 0 on success or a negative error code. 243 */ 244 int rtnl_unregister(int protocol, int msgtype) 245 { 246 int msgindex; 247 248 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 249 msgindex = rtm_msgindex(msgtype); 250 251 if (rtnl_msg_handlers[protocol] == NULL) 252 return -ENOENT; 253 254 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 255 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 256 257 return 0; 258 } 259 EXPORT_SYMBOL_GPL(rtnl_unregister); 260 261 /** 262 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 263 * @protocol : Protocol family or PF_UNSPEC 264 * 265 * Identical to calling rtnl_unregster() for all registered message types 266 * of a certain protocol family. 267 */ 268 void rtnl_unregister_all(int protocol) 269 { 270 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 271 272 kfree(rtnl_msg_handlers[protocol]); 273 rtnl_msg_handlers[protocol] = NULL; 274 } 275 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 276 277 static LIST_HEAD(link_ops); 278 279 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 280 { 281 const struct rtnl_link_ops *ops; 282 283 list_for_each_entry(ops, &link_ops, list) { 284 if (!strcmp(ops->kind, kind)) 285 return ops; 286 } 287 return NULL; 288 } 289 290 /** 291 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 292 * @ops: struct rtnl_link_ops * to register 293 * 294 * The caller must hold the rtnl_mutex. This function should be used 295 * by drivers that create devices during module initialization. It 296 * must be called before registering the devices. 297 * 298 * Returns 0 on success or a negative error code. 299 */ 300 int __rtnl_link_register(struct rtnl_link_ops *ops) 301 { 302 if (rtnl_link_ops_get(ops->kind)) 303 return -EEXIST; 304 305 /* The check for setup is here because if ops 306 * does not have that filled up, it is not possible 307 * to use the ops for creating device. So do not 308 * fill up dellink as well. That disables rtnl_dellink. 309 */ 310 if (ops->setup && !ops->dellink) 311 ops->dellink = unregister_netdevice_queue; 312 313 list_add_tail(&ops->list, &link_ops); 314 return 0; 315 } 316 EXPORT_SYMBOL_GPL(__rtnl_link_register); 317 318 /** 319 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 320 * @ops: struct rtnl_link_ops * to register 321 * 322 * Returns 0 on success or a negative error code. 323 */ 324 int rtnl_link_register(struct rtnl_link_ops *ops) 325 { 326 int err; 327 328 rtnl_lock(); 329 err = __rtnl_link_register(ops); 330 rtnl_unlock(); 331 return err; 332 } 333 EXPORT_SYMBOL_GPL(rtnl_link_register); 334 335 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 336 { 337 struct net_device *dev; 338 LIST_HEAD(list_kill); 339 340 for_each_netdev(net, dev) { 341 if (dev->rtnl_link_ops == ops) 342 ops->dellink(dev, &list_kill); 343 } 344 unregister_netdevice_many(&list_kill); 345 } 346 347 /** 348 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 349 * @ops: struct rtnl_link_ops * to unregister 350 * 351 * The caller must hold the rtnl_mutex. 352 */ 353 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 354 { 355 struct net *net; 356 357 for_each_net(net) { 358 __rtnl_kill_links(net, ops); 359 } 360 list_del(&ops->list); 361 } 362 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 363 364 /* Return with the rtnl_lock held when there are no network 365 * devices unregistering in any network namespace. 366 */ 367 static void rtnl_lock_unregistering_all(void) 368 { 369 struct net *net; 370 bool unregistering; 371 DEFINE_WAIT_FUNC(wait, woken_wake_function); 372 373 add_wait_queue(&netdev_unregistering_wq, &wait); 374 for (;;) { 375 unregistering = false; 376 rtnl_lock(); 377 for_each_net(net) { 378 if (net->dev_unreg_count > 0) { 379 unregistering = true; 380 break; 381 } 382 } 383 if (!unregistering) 384 break; 385 __rtnl_unlock(); 386 387 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 388 } 389 remove_wait_queue(&netdev_unregistering_wq, &wait); 390 } 391 392 /** 393 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 394 * @ops: struct rtnl_link_ops * to unregister 395 */ 396 void rtnl_link_unregister(struct rtnl_link_ops *ops) 397 { 398 /* Close the race with cleanup_net() */ 399 mutex_lock(&net_mutex); 400 rtnl_lock_unregistering_all(); 401 __rtnl_link_unregister(ops); 402 rtnl_unlock(); 403 mutex_unlock(&net_mutex); 404 } 405 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 406 407 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 408 { 409 struct net_device *master_dev; 410 const struct rtnl_link_ops *ops; 411 412 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 413 if (!master_dev) 414 return 0; 415 ops = master_dev->rtnl_link_ops; 416 if (!ops || !ops->get_slave_size) 417 return 0; 418 /* IFLA_INFO_SLAVE_DATA + nested data */ 419 return nla_total_size(sizeof(struct nlattr)) + 420 ops->get_slave_size(master_dev, dev); 421 } 422 423 static size_t rtnl_link_get_size(const struct net_device *dev) 424 { 425 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 426 size_t size; 427 428 if (!ops) 429 return 0; 430 431 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 432 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 433 434 if (ops->get_size) 435 /* IFLA_INFO_DATA + nested data */ 436 size += nla_total_size(sizeof(struct nlattr)) + 437 ops->get_size(dev); 438 439 if (ops->get_xstats_size) 440 /* IFLA_INFO_XSTATS */ 441 size += nla_total_size(ops->get_xstats_size(dev)); 442 443 size += rtnl_link_get_slave_info_data_size(dev); 444 445 return size; 446 } 447 448 static LIST_HEAD(rtnl_af_ops); 449 450 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 451 { 452 const struct rtnl_af_ops *ops; 453 454 list_for_each_entry(ops, &rtnl_af_ops, list) { 455 if (ops->family == family) 456 return ops; 457 } 458 459 return NULL; 460 } 461 462 /** 463 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 464 * @ops: struct rtnl_af_ops * to register 465 * 466 * Returns 0 on success or a negative error code. 467 */ 468 void rtnl_af_register(struct rtnl_af_ops *ops) 469 { 470 rtnl_lock(); 471 list_add_tail(&ops->list, &rtnl_af_ops); 472 rtnl_unlock(); 473 } 474 EXPORT_SYMBOL_GPL(rtnl_af_register); 475 476 /** 477 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 478 * @ops: struct rtnl_af_ops * to unregister 479 * 480 * The caller must hold the rtnl_mutex. 481 */ 482 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 483 { 484 list_del(&ops->list); 485 } 486 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 487 488 /** 489 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 490 * @ops: struct rtnl_af_ops * to unregister 491 */ 492 void rtnl_af_unregister(struct rtnl_af_ops *ops) 493 { 494 rtnl_lock(); 495 __rtnl_af_unregister(ops); 496 rtnl_unlock(); 497 } 498 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 499 500 static size_t rtnl_link_get_af_size(const struct net_device *dev) 501 { 502 struct rtnl_af_ops *af_ops; 503 size_t size; 504 505 /* IFLA_AF_SPEC */ 506 size = nla_total_size(sizeof(struct nlattr)); 507 508 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 509 if (af_ops->get_link_af_size) { 510 /* AF_* + nested data */ 511 size += nla_total_size(sizeof(struct nlattr)) + 512 af_ops->get_link_af_size(dev); 513 } 514 } 515 516 return size; 517 } 518 519 static bool rtnl_have_link_slave_info(const struct net_device *dev) 520 { 521 struct net_device *master_dev; 522 523 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 524 if (master_dev && master_dev->rtnl_link_ops) 525 return true; 526 return false; 527 } 528 529 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 530 const struct net_device *dev) 531 { 532 struct net_device *master_dev; 533 const struct rtnl_link_ops *ops; 534 struct nlattr *slave_data; 535 int err; 536 537 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 538 if (!master_dev) 539 return 0; 540 ops = master_dev->rtnl_link_ops; 541 if (!ops) 542 return 0; 543 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 544 return -EMSGSIZE; 545 if (ops->fill_slave_info) { 546 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA); 547 if (!slave_data) 548 return -EMSGSIZE; 549 err = ops->fill_slave_info(skb, master_dev, dev); 550 if (err < 0) 551 goto err_cancel_slave_data; 552 nla_nest_end(skb, slave_data); 553 } 554 return 0; 555 556 err_cancel_slave_data: 557 nla_nest_cancel(skb, slave_data); 558 return err; 559 } 560 561 static int rtnl_link_info_fill(struct sk_buff *skb, 562 const struct net_device *dev) 563 { 564 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 565 struct nlattr *data; 566 int err; 567 568 if (!ops) 569 return 0; 570 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 571 return -EMSGSIZE; 572 if (ops->fill_xstats) { 573 err = ops->fill_xstats(skb, dev); 574 if (err < 0) 575 return err; 576 } 577 if (ops->fill_info) { 578 data = nla_nest_start(skb, IFLA_INFO_DATA); 579 if (data == NULL) 580 return -EMSGSIZE; 581 err = ops->fill_info(skb, dev); 582 if (err < 0) 583 goto err_cancel_data; 584 nla_nest_end(skb, data); 585 } 586 return 0; 587 588 err_cancel_data: 589 nla_nest_cancel(skb, data); 590 return err; 591 } 592 593 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 594 { 595 struct nlattr *linkinfo; 596 int err = -EMSGSIZE; 597 598 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 599 if (linkinfo == NULL) 600 goto out; 601 602 err = rtnl_link_info_fill(skb, dev); 603 if (err < 0) 604 goto err_cancel_link; 605 606 err = rtnl_link_slave_info_fill(skb, dev); 607 if (err < 0) 608 goto err_cancel_link; 609 610 nla_nest_end(skb, linkinfo); 611 return 0; 612 613 err_cancel_link: 614 nla_nest_cancel(skb, linkinfo); 615 out: 616 return err; 617 } 618 619 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 620 { 621 struct sock *rtnl = net->rtnl; 622 int err = 0; 623 624 NETLINK_CB(skb).dst_group = group; 625 if (echo) 626 atomic_inc(&skb->users); 627 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 628 if (echo) 629 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 630 return err; 631 } 632 633 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 634 { 635 struct sock *rtnl = net->rtnl; 636 637 return nlmsg_unicast(rtnl, skb, pid); 638 } 639 EXPORT_SYMBOL(rtnl_unicast); 640 641 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 642 struct nlmsghdr *nlh, gfp_t flags) 643 { 644 struct sock *rtnl = net->rtnl; 645 int report = 0; 646 647 if (nlh) 648 report = nlmsg_report(nlh); 649 650 nlmsg_notify(rtnl, skb, pid, group, report, flags); 651 } 652 EXPORT_SYMBOL(rtnl_notify); 653 654 void rtnl_set_sk_err(struct net *net, u32 group, int error) 655 { 656 struct sock *rtnl = net->rtnl; 657 658 netlink_set_err(rtnl, 0, group, error); 659 } 660 EXPORT_SYMBOL(rtnl_set_sk_err); 661 662 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 663 { 664 struct nlattr *mx; 665 int i, valid = 0; 666 667 mx = nla_nest_start(skb, RTA_METRICS); 668 if (mx == NULL) 669 return -ENOBUFS; 670 671 for (i = 0; i < RTAX_MAX; i++) { 672 if (metrics[i]) { 673 if (i == RTAX_CC_ALGO - 1) { 674 char tmp[TCP_CA_NAME_MAX], *name; 675 676 name = tcp_ca_get_name_by_key(metrics[i], tmp); 677 if (!name) 678 continue; 679 if (nla_put_string(skb, i + 1, name)) 680 goto nla_put_failure; 681 } else { 682 if (nla_put_u32(skb, i + 1, metrics[i])) 683 goto nla_put_failure; 684 } 685 valid++; 686 } 687 } 688 689 if (!valid) { 690 nla_nest_cancel(skb, mx); 691 return 0; 692 } 693 694 return nla_nest_end(skb, mx); 695 696 nla_put_failure: 697 nla_nest_cancel(skb, mx); 698 return -EMSGSIZE; 699 } 700 EXPORT_SYMBOL(rtnetlink_put_metrics); 701 702 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 703 long expires, u32 error) 704 { 705 struct rta_cacheinfo ci = { 706 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 707 .rta_used = dst->__use, 708 .rta_clntref = atomic_read(&(dst->__refcnt)), 709 .rta_error = error, 710 .rta_id = id, 711 }; 712 713 if (expires) { 714 unsigned long clock; 715 716 clock = jiffies_to_clock_t(abs(expires)); 717 clock = min_t(unsigned long, clock, INT_MAX); 718 ci.rta_expires = (expires > 0) ? clock : -clock; 719 } 720 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 721 } 722 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 723 724 static void set_operstate(struct net_device *dev, unsigned char transition) 725 { 726 unsigned char operstate = dev->operstate; 727 728 switch (transition) { 729 case IF_OPER_UP: 730 if ((operstate == IF_OPER_DORMANT || 731 operstate == IF_OPER_UNKNOWN) && 732 !netif_dormant(dev)) 733 operstate = IF_OPER_UP; 734 break; 735 736 case IF_OPER_DORMANT: 737 if (operstate == IF_OPER_UP || 738 operstate == IF_OPER_UNKNOWN) 739 operstate = IF_OPER_DORMANT; 740 break; 741 } 742 743 if (dev->operstate != operstate) { 744 write_lock_bh(&dev_base_lock); 745 dev->operstate = operstate; 746 write_unlock_bh(&dev_base_lock); 747 netdev_state_change(dev); 748 } 749 } 750 751 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 752 { 753 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 754 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 755 } 756 757 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 758 const struct ifinfomsg *ifm) 759 { 760 unsigned int flags = ifm->ifi_flags; 761 762 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 763 if (ifm->ifi_change) 764 flags = (flags & ifm->ifi_change) | 765 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 766 767 return flags; 768 } 769 770 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 771 const struct rtnl_link_stats64 *b) 772 { 773 a->rx_packets = b->rx_packets; 774 a->tx_packets = b->tx_packets; 775 a->rx_bytes = b->rx_bytes; 776 a->tx_bytes = b->tx_bytes; 777 a->rx_errors = b->rx_errors; 778 a->tx_errors = b->tx_errors; 779 a->rx_dropped = b->rx_dropped; 780 a->tx_dropped = b->tx_dropped; 781 782 a->multicast = b->multicast; 783 a->collisions = b->collisions; 784 785 a->rx_length_errors = b->rx_length_errors; 786 a->rx_over_errors = b->rx_over_errors; 787 a->rx_crc_errors = b->rx_crc_errors; 788 a->rx_frame_errors = b->rx_frame_errors; 789 a->rx_fifo_errors = b->rx_fifo_errors; 790 a->rx_missed_errors = b->rx_missed_errors; 791 792 a->tx_aborted_errors = b->tx_aborted_errors; 793 a->tx_carrier_errors = b->tx_carrier_errors; 794 a->tx_fifo_errors = b->tx_fifo_errors; 795 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 796 a->tx_window_errors = b->tx_window_errors; 797 798 a->rx_compressed = b->rx_compressed; 799 a->tx_compressed = b->tx_compressed; 800 } 801 802 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 803 { 804 memcpy(v, b, sizeof(*b)); 805 } 806 807 /* All VF info */ 808 static inline int rtnl_vfinfo_size(const struct net_device *dev, 809 u32 ext_filter_mask) 810 { 811 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 812 (ext_filter_mask & RTEXT_FILTER_VF)) { 813 int num_vfs = dev_num_vf(dev->dev.parent); 814 size_t size = nla_total_size(sizeof(struct nlattr)); 815 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 816 size += num_vfs * 817 (nla_total_size(sizeof(struct ifla_vf_mac)) + 818 nla_total_size(sizeof(struct ifla_vf_vlan)) + 819 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 820 nla_total_size(sizeof(struct ifla_vf_rate)) + 821 nla_total_size(sizeof(struct ifla_vf_link_state)) + 822 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 823 /* IFLA_VF_STATS_RX_PACKETS */ 824 nla_total_size(sizeof(__u64)) + 825 /* IFLA_VF_STATS_TX_PACKETS */ 826 nla_total_size(sizeof(__u64)) + 827 /* IFLA_VF_STATS_RX_BYTES */ 828 nla_total_size(sizeof(__u64)) + 829 /* IFLA_VF_STATS_TX_BYTES */ 830 nla_total_size(sizeof(__u64)) + 831 /* IFLA_VF_STATS_BROADCAST */ 832 nla_total_size(sizeof(__u64)) + 833 /* IFLA_VF_STATS_MULTICAST */ 834 nla_total_size(sizeof(__u64))); 835 return size; 836 } else 837 return 0; 838 } 839 840 static size_t rtnl_port_size(const struct net_device *dev, 841 u32 ext_filter_mask) 842 { 843 size_t port_size = nla_total_size(4) /* PORT_VF */ 844 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 845 + nla_total_size(sizeof(struct ifla_port_vsi)) 846 /* PORT_VSI_TYPE */ 847 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 848 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 849 + nla_total_size(1) /* PROT_VDP_REQUEST */ 850 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 851 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 852 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 853 + port_size; 854 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 855 + port_size; 856 857 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 858 !(ext_filter_mask & RTEXT_FILTER_VF)) 859 return 0; 860 if (dev_num_vf(dev->dev.parent)) 861 return port_self_size + vf_ports_size + 862 vf_port_size * dev_num_vf(dev->dev.parent); 863 else 864 return port_self_size; 865 } 866 867 static noinline size_t if_nlmsg_size(const struct net_device *dev, 868 u32 ext_filter_mask) 869 { 870 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 871 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 872 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 873 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 874 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 875 + nla_total_size(sizeof(struct rtnl_link_stats)) 876 + nla_total_size(sizeof(struct rtnl_link_stats64)) 877 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 878 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 879 + nla_total_size(4) /* IFLA_TXQLEN */ 880 + nla_total_size(4) /* IFLA_WEIGHT */ 881 + nla_total_size(4) /* IFLA_MTU */ 882 + nla_total_size(4) /* IFLA_LINK */ 883 + nla_total_size(4) /* IFLA_MASTER */ 884 + nla_total_size(1) /* IFLA_CARRIER */ 885 + nla_total_size(4) /* IFLA_PROMISCUITY */ 886 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 887 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 888 + nla_total_size(1) /* IFLA_OPERSTATE */ 889 + nla_total_size(1) /* IFLA_LINKMODE */ 890 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 891 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 892 + nla_total_size(ext_filter_mask 893 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 894 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 895 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 896 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 897 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */ 898 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 899 + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_SWITCH_ID */ 900 } 901 902 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 903 { 904 struct nlattr *vf_ports; 905 struct nlattr *vf_port; 906 int vf; 907 int err; 908 909 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 910 if (!vf_ports) 911 return -EMSGSIZE; 912 913 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 914 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 915 if (!vf_port) 916 goto nla_put_failure; 917 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 918 goto nla_put_failure; 919 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 920 if (err == -EMSGSIZE) 921 goto nla_put_failure; 922 if (err) { 923 nla_nest_cancel(skb, vf_port); 924 continue; 925 } 926 nla_nest_end(skb, vf_port); 927 } 928 929 nla_nest_end(skb, vf_ports); 930 931 return 0; 932 933 nla_put_failure: 934 nla_nest_cancel(skb, vf_ports); 935 return -EMSGSIZE; 936 } 937 938 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 939 { 940 struct nlattr *port_self; 941 int err; 942 943 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 944 if (!port_self) 945 return -EMSGSIZE; 946 947 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 948 if (err) { 949 nla_nest_cancel(skb, port_self); 950 return (err == -EMSGSIZE) ? err : 0; 951 } 952 953 nla_nest_end(skb, port_self); 954 955 return 0; 956 } 957 958 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 959 u32 ext_filter_mask) 960 { 961 int err; 962 963 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 964 !(ext_filter_mask & RTEXT_FILTER_VF)) 965 return 0; 966 967 err = rtnl_port_self_fill(skb, dev); 968 if (err) 969 return err; 970 971 if (dev_num_vf(dev->dev.parent)) { 972 err = rtnl_vf_ports_fill(skb, dev); 973 if (err) 974 return err; 975 } 976 977 return 0; 978 } 979 980 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 981 { 982 int err; 983 struct netdev_phys_item_id ppid; 984 985 err = dev_get_phys_port_id(dev, &ppid); 986 if (err) { 987 if (err == -EOPNOTSUPP) 988 return 0; 989 return err; 990 } 991 992 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 993 return -EMSGSIZE; 994 995 return 0; 996 } 997 998 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 999 { 1000 char name[IFNAMSIZ]; 1001 int err; 1002 1003 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1004 if (err) { 1005 if (err == -EOPNOTSUPP) 1006 return 0; 1007 return err; 1008 } 1009 1010 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 1011 return -EMSGSIZE; 1012 1013 return 0; 1014 } 1015 1016 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1017 { 1018 int err; 1019 struct switchdev_attr attr = { 1020 .id = SWITCHDEV_ATTR_PORT_PARENT_ID, 1021 .flags = SWITCHDEV_F_NO_RECURSE, 1022 }; 1023 1024 err = switchdev_port_attr_get(dev, &attr); 1025 if (err) { 1026 if (err == -EOPNOTSUPP) 1027 return 0; 1028 return err; 1029 } 1030 1031 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1032 attr.u.ppid.id)) 1033 return -EMSGSIZE; 1034 1035 return 0; 1036 } 1037 1038 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1039 int type, u32 pid, u32 seq, u32 change, 1040 unsigned int flags, u32 ext_filter_mask) 1041 { 1042 struct ifinfomsg *ifm; 1043 struct nlmsghdr *nlh; 1044 struct rtnl_link_stats64 temp; 1045 const struct rtnl_link_stats64 *stats; 1046 struct nlattr *attr, *af_spec; 1047 struct rtnl_af_ops *af_ops; 1048 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1049 1050 ASSERT_RTNL(); 1051 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1052 if (nlh == NULL) 1053 return -EMSGSIZE; 1054 1055 ifm = nlmsg_data(nlh); 1056 ifm->ifi_family = AF_UNSPEC; 1057 ifm->__ifi_pad = 0; 1058 ifm->ifi_type = dev->type; 1059 ifm->ifi_index = dev->ifindex; 1060 ifm->ifi_flags = dev_get_flags(dev); 1061 ifm->ifi_change = change; 1062 1063 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1064 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1065 nla_put_u8(skb, IFLA_OPERSTATE, 1066 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1067 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1068 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1069 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1070 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1071 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1072 #ifdef CONFIG_RPS 1073 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1074 #endif 1075 (dev->ifindex != dev_get_iflink(dev) && 1076 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1077 (upper_dev && 1078 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1079 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1080 (dev->qdisc && 1081 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1082 (dev->ifalias && 1083 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1084 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1085 atomic_read(&dev->carrier_changes))) 1086 goto nla_put_failure; 1087 1088 if (1) { 1089 struct rtnl_link_ifmap map = { 1090 .mem_start = dev->mem_start, 1091 .mem_end = dev->mem_end, 1092 .base_addr = dev->base_addr, 1093 .irq = dev->irq, 1094 .dma = dev->dma, 1095 .port = dev->if_port, 1096 }; 1097 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1098 goto nla_put_failure; 1099 } 1100 1101 if (dev->addr_len) { 1102 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1103 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1104 goto nla_put_failure; 1105 } 1106 1107 if (rtnl_phys_port_id_fill(skb, dev)) 1108 goto nla_put_failure; 1109 1110 if (rtnl_phys_port_name_fill(skb, dev)) 1111 goto nla_put_failure; 1112 1113 if (rtnl_phys_switch_id_fill(skb, dev)) 1114 goto nla_put_failure; 1115 1116 attr = nla_reserve(skb, IFLA_STATS, 1117 sizeof(struct rtnl_link_stats)); 1118 if (attr == NULL) 1119 goto nla_put_failure; 1120 1121 stats = dev_get_stats(dev, &temp); 1122 copy_rtnl_link_stats(nla_data(attr), stats); 1123 1124 attr = nla_reserve(skb, IFLA_STATS64, 1125 sizeof(struct rtnl_link_stats64)); 1126 if (attr == NULL) 1127 goto nla_put_failure; 1128 copy_rtnl_link_stats64(nla_data(attr), stats); 1129 1130 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1131 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1132 goto nla_put_failure; 1133 1134 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 1135 && (ext_filter_mask & RTEXT_FILTER_VF)) { 1136 int i; 1137 1138 struct nlattr *vfinfo, *vf, *vfstats; 1139 int num_vfs = dev_num_vf(dev->dev.parent); 1140 1141 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1142 if (!vfinfo) 1143 goto nla_put_failure; 1144 for (i = 0; i < num_vfs; i++) { 1145 struct ifla_vf_info ivi; 1146 struct ifla_vf_mac vf_mac; 1147 struct ifla_vf_vlan vf_vlan; 1148 struct ifla_vf_rate vf_rate; 1149 struct ifla_vf_tx_rate vf_tx_rate; 1150 struct ifla_vf_spoofchk vf_spoofchk; 1151 struct ifla_vf_link_state vf_linkstate; 1152 struct ifla_vf_rss_query_en vf_rss_query_en; 1153 struct ifla_vf_stats vf_stats; 1154 1155 /* 1156 * Not all SR-IOV capable drivers support the 1157 * spoofcheck and "RSS query enable" query. Preset to 1158 * -1 so the user space tool can detect that the driver 1159 * didn't report anything. 1160 */ 1161 ivi.spoofchk = -1; 1162 ivi.rss_query_en = -1; 1163 memset(ivi.mac, 0, sizeof(ivi.mac)); 1164 /* The default value for VF link state is "auto" 1165 * IFLA_VF_LINK_STATE_AUTO which equals zero 1166 */ 1167 ivi.linkstate = 0; 1168 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 1169 break; 1170 vf_mac.vf = 1171 vf_vlan.vf = 1172 vf_rate.vf = 1173 vf_tx_rate.vf = 1174 vf_spoofchk.vf = 1175 vf_linkstate.vf = 1176 vf_rss_query_en.vf = ivi.vf; 1177 1178 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1179 vf_vlan.vlan = ivi.vlan; 1180 vf_vlan.qos = ivi.qos; 1181 vf_tx_rate.rate = ivi.max_tx_rate; 1182 vf_rate.min_tx_rate = ivi.min_tx_rate; 1183 vf_rate.max_tx_rate = ivi.max_tx_rate; 1184 vf_spoofchk.setting = ivi.spoofchk; 1185 vf_linkstate.link_state = ivi.linkstate; 1186 vf_rss_query_en.setting = ivi.rss_query_en; 1187 vf = nla_nest_start(skb, IFLA_VF_INFO); 1188 if (!vf) { 1189 nla_nest_cancel(skb, vfinfo); 1190 goto nla_put_failure; 1191 } 1192 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1193 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1194 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1195 &vf_rate) || 1196 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1197 &vf_tx_rate) || 1198 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1199 &vf_spoofchk) || 1200 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1201 &vf_linkstate) || 1202 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1203 sizeof(vf_rss_query_en), 1204 &vf_rss_query_en)) 1205 goto nla_put_failure; 1206 memset(&vf_stats, 0, sizeof(vf_stats)); 1207 if (dev->netdev_ops->ndo_get_vf_stats) 1208 dev->netdev_ops->ndo_get_vf_stats(dev, i, 1209 &vf_stats); 1210 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1211 if (!vfstats) { 1212 nla_nest_cancel(skb, vf); 1213 nla_nest_cancel(skb, vfinfo); 1214 goto nla_put_failure; 1215 } 1216 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS, 1217 vf_stats.rx_packets) || 1218 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS, 1219 vf_stats.tx_packets) || 1220 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES, 1221 vf_stats.rx_bytes) || 1222 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES, 1223 vf_stats.tx_bytes) || 1224 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST, 1225 vf_stats.broadcast) || 1226 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST, 1227 vf_stats.multicast)) 1228 goto nla_put_failure; 1229 nla_nest_end(skb, vfstats); 1230 nla_nest_end(skb, vf); 1231 } 1232 nla_nest_end(skb, vfinfo); 1233 } 1234 1235 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1236 goto nla_put_failure; 1237 1238 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1239 if (rtnl_link_fill(skb, dev) < 0) 1240 goto nla_put_failure; 1241 } 1242 1243 if (dev->rtnl_link_ops && 1244 dev->rtnl_link_ops->get_link_net) { 1245 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1246 1247 if (!net_eq(dev_net(dev), link_net)) { 1248 int id = peernet2id_alloc(dev_net(dev), link_net); 1249 1250 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1251 goto nla_put_failure; 1252 } 1253 } 1254 1255 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1256 goto nla_put_failure; 1257 1258 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1259 if (af_ops->fill_link_af) { 1260 struct nlattr *af; 1261 int err; 1262 1263 if (!(af = nla_nest_start(skb, af_ops->family))) 1264 goto nla_put_failure; 1265 1266 err = af_ops->fill_link_af(skb, dev); 1267 1268 /* 1269 * Caller may return ENODATA to indicate that there 1270 * was no data to be dumped. This is not an error, it 1271 * means we should trim the attribute header and 1272 * continue. 1273 */ 1274 if (err == -ENODATA) 1275 nla_nest_cancel(skb, af); 1276 else if (err < 0) 1277 goto nla_put_failure; 1278 1279 nla_nest_end(skb, af); 1280 } 1281 } 1282 1283 nla_nest_end(skb, af_spec); 1284 1285 nlmsg_end(skb, nlh); 1286 return 0; 1287 1288 nla_put_failure: 1289 nlmsg_cancel(skb, nlh); 1290 return -EMSGSIZE; 1291 } 1292 1293 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1294 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1295 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1296 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1297 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1298 [IFLA_MTU] = { .type = NLA_U32 }, 1299 [IFLA_LINK] = { .type = NLA_U32 }, 1300 [IFLA_MASTER] = { .type = NLA_U32 }, 1301 [IFLA_CARRIER] = { .type = NLA_U8 }, 1302 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1303 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1304 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1305 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1306 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1307 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1308 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1309 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1310 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1311 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1312 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1313 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1314 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1315 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1316 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1317 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1318 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1319 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1320 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1321 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1322 }; 1323 1324 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1325 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1326 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1327 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1328 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1329 }; 1330 1331 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1332 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1333 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1334 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1335 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1336 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1337 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1338 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1339 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1340 }; 1341 1342 static const struct nla_policy ifla_vf_stats_policy[IFLA_VF_STATS_MAX + 1] = { 1343 [IFLA_VF_STATS_RX_PACKETS] = { .type = NLA_U64 }, 1344 [IFLA_VF_STATS_TX_PACKETS] = { .type = NLA_U64 }, 1345 [IFLA_VF_STATS_RX_BYTES] = { .type = NLA_U64 }, 1346 [IFLA_VF_STATS_TX_BYTES] = { .type = NLA_U64 }, 1347 [IFLA_VF_STATS_BROADCAST] = { .type = NLA_U64 }, 1348 [IFLA_VF_STATS_MULTICAST] = { .type = NLA_U64 }, 1349 }; 1350 1351 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1352 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1353 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1354 .len = PORT_PROFILE_MAX }, 1355 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1356 .len = sizeof(struct ifla_port_vsi)}, 1357 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1358 .len = PORT_UUID_MAX }, 1359 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1360 .len = PORT_UUID_MAX }, 1361 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1362 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1363 }; 1364 1365 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1366 { 1367 struct net *net = sock_net(skb->sk); 1368 int h, s_h; 1369 int idx = 0, s_idx; 1370 struct net_device *dev; 1371 struct hlist_head *head; 1372 struct nlattr *tb[IFLA_MAX+1]; 1373 u32 ext_filter_mask = 0; 1374 int err; 1375 int hdrlen; 1376 1377 s_h = cb->args[0]; 1378 s_idx = cb->args[1]; 1379 1380 cb->seq = net->dev_base_seq; 1381 1382 /* A hack to preserve kernel<->userspace interface. 1383 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1384 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1385 * what iproute2 < v3.9.0 used. 1386 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1387 * attribute, its netlink message is shorter than struct ifinfomsg. 1388 */ 1389 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1390 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1391 1392 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1393 1394 if (tb[IFLA_EXT_MASK]) 1395 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1396 } 1397 1398 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1399 idx = 0; 1400 head = &net->dev_index_head[h]; 1401 hlist_for_each_entry(dev, head, index_hlist) { 1402 if (idx < s_idx) 1403 goto cont; 1404 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1405 NETLINK_CB(cb->skb).portid, 1406 cb->nlh->nlmsg_seq, 0, 1407 NLM_F_MULTI, 1408 ext_filter_mask); 1409 /* If we ran out of room on the first message, 1410 * we're in trouble 1411 */ 1412 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1413 1414 if (err < 0) 1415 goto out; 1416 1417 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1418 cont: 1419 idx++; 1420 } 1421 } 1422 out: 1423 cb->args[1] = idx; 1424 cb->args[0] = h; 1425 1426 return skb->len; 1427 } 1428 1429 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1430 { 1431 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1432 } 1433 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1434 1435 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1436 { 1437 struct net *net; 1438 /* Examine the link attributes and figure out which 1439 * network namespace we are talking about. 1440 */ 1441 if (tb[IFLA_NET_NS_PID]) 1442 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1443 else if (tb[IFLA_NET_NS_FD]) 1444 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1445 else 1446 net = get_net(src_net); 1447 return net; 1448 } 1449 EXPORT_SYMBOL(rtnl_link_get_net); 1450 1451 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1452 { 1453 if (dev) { 1454 if (tb[IFLA_ADDRESS] && 1455 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1456 return -EINVAL; 1457 1458 if (tb[IFLA_BROADCAST] && 1459 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1460 return -EINVAL; 1461 } 1462 1463 if (tb[IFLA_AF_SPEC]) { 1464 struct nlattr *af; 1465 int rem, err; 1466 1467 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1468 const struct rtnl_af_ops *af_ops; 1469 1470 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1471 return -EAFNOSUPPORT; 1472 1473 if (!af_ops->set_link_af) 1474 return -EOPNOTSUPP; 1475 1476 if (af_ops->validate_link_af) { 1477 err = af_ops->validate_link_af(dev, af); 1478 if (err < 0) 1479 return err; 1480 } 1481 } 1482 } 1483 1484 return 0; 1485 } 1486 1487 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 1488 { 1489 const struct net_device_ops *ops = dev->netdev_ops; 1490 int err = -EINVAL; 1491 1492 if (tb[IFLA_VF_MAC]) { 1493 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 1494 1495 err = -EOPNOTSUPP; 1496 if (ops->ndo_set_vf_mac) 1497 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1498 ivm->mac); 1499 if (err < 0) 1500 return err; 1501 } 1502 1503 if (tb[IFLA_VF_VLAN]) { 1504 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 1505 1506 err = -EOPNOTSUPP; 1507 if (ops->ndo_set_vf_vlan) 1508 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 1509 ivv->qos); 1510 if (err < 0) 1511 return err; 1512 } 1513 1514 if (tb[IFLA_VF_TX_RATE]) { 1515 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1516 struct ifla_vf_info ivf; 1517 1518 err = -EOPNOTSUPP; 1519 if (ops->ndo_get_vf_config) 1520 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 1521 if (err < 0) 1522 return err; 1523 1524 err = -EOPNOTSUPP; 1525 if (ops->ndo_set_vf_rate) 1526 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1527 ivf.min_tx_rate, 1528 ivt->rate); 1529 if (err < 0) 1530 return err; 1531 } 1532 1533 if (tb[IFLA_VF_RATE]) { 1534 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 1535 1536 err = -EOPNOTSUPP; 1537 if (ops->ndo_set_vf_rate) 1538 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1539 ivt->min_tx_rate, 1540 ivt->max_tx_rate); 1541 if (err < 0) 1542 return err; 1543 } 1544 1545 if (tb[IFLA_VF_SPOOFCHK]) { 1546 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 1547 1548 err = -EOPNOTSUPP; 1549 if (ops->ndo_set_vf_spoofchk) 1550 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1551 ivs->setting); 1552 if (err < 0) 1553 return err; 1554 } 1555 1556 if (tb[IFLA_VF_LINK_STATE]) { 1557 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 1558 1559 err = -EOPNOTSUPP; 1560 if (ops->ndo_set_vf_link_state) 1561 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1562 ivl->link_state); 1563 if (err < 0) 1564 return err; 1565 } 1566 1567 if (tb[IFLA_VF_RSS_QUERY_EN]) { 1568 struct ifla_vf_rss_query_en *ivrssq_en; 1569 1570 err = -EOPNOTSUPP; 1571 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 1572 if (ops->ndo_set_vf_rss_query_en) 1573 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 1574 ivrssq_en->setting); 1575 if (err < 0) 1576 return err; 1577 } 1578 1579 return err; 1580 } 1581 1582 static int do_set_master(struct net_device *dev, int ifindex) 1583 { 1584 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1585 const struct net_device_ops *ops; 1586 int err; 1587 1588 if (upper_dev) { 1589 if (upper_dev->ifindex == ifindex) 1590 return 0; 1591 ops = upper_dev->netdev_ops; 1592 if (ops->ndo_del_slave) { 1593 err = ops->ndo_del_slave(upper_dev, dev); 1594 if (err) 1595 return err; 1596 } else { 1597 return -EOPNOTSUPP; 1598 } 1599 } 1600 1601 if (ifindex) { 1602 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1603 if (!upper_dev) 1604 return -EINVAL; 1605 ops = upper_dev->netdev_ops; 1606 if (ops->ndo_add_slave) { 1607 err = ops->ndo_add_slave(upper_dev, dev); 1608 if (err) 1609 return err; 1610 } else { 1611 return -EOPNOTSUPP; 1612 } 1613 } 1614 return 0; 1615 } 1616 1617 #define DO_SETLINK_MODIFIED 0x01 1618 /* notify flag means notify + modified. */ 1619 #define DO_SETLINK_NOTIFY 0x03 1620 static int do_setlink(const struct sk_buff *skb, 1621 struct net_device *dev, struct ifinfomsg *ifm, 1622 struct nlattr **tb, char *ifname, int status) 1623 { 1624 const struct net_device_ops *ops = dev->netdev_ops; 1625 int err; 1626 1627 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1628 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1629 if (IS_ERR(net)) { 1630 err = PTR_ERR(net); 1631 goto errout; 1632 } 1633 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1634 put_net(net); 1635 err = -EPERM; 1636 goto errout; 1637 } 1638 err = dev_change_net_namespace(dev, net, ifname); 1639 put_net(net); 1640 if (err) 1641 goto errout; 1642 status |= DO_SETLINK_MODIFIED; 1643 } 1644 1645 if (tb[IFLA_MAP]) { 1646 struct rtnl_link_ifmap *u_map; 1647 struct ifmap k_map; 1648 1649 if (!ops->ndo_set_config) { 1650 err = -EOPNOTSUPP; 1651 goto errout; 1652 } 1653 1654 if (!netif_device_present(dev)) { 1655 err = -ENODEV; 1656 goto errout; 1657 } 1658 1659 u_map = nla_data(tb[IFLA_MAP]); 1660 k_map.mem_start = (unsigned long) u_map->mem_start; 1661 k_map.mem_end = (unsigned long) u_map->mem_end; 1662 k_map.base_addr = (unsigned short) u_map->base_addr; 1663 k_map.irq = (unsigned char) u_map->irq; 1664 k_map.dma = (unsigned char) u_map->dma; 1665 k_map.port = (unsigned char) u_map->port; 1666 1667 err = ops->ndo_set_config(dev, &k_map); 1668 if (err < 0) 1669 goto errout; 1670 1671 status |= DO_SETLINK_NOTIFY; 1672 } 1673 1674 if (tb[IFLA_ADDRESS]) { 1675 struct sockaddr *sa; 1676 int len; 1677 1678 len = sizeof(sa_family_t) + dev->addr_len; 1679 sa = kmalloc(len, GFP_KERNEL); 1680 if (!sa) { 1681 err = -ENOMEM; 1682 goto errout; 1683 } 1684 sa->sa_family = dev->type; 1685 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1686 dev->addr_len); 1687 err = dev_set_mac_address(dev, sa); 1688 kfree(sa); 1689 if (err) 1690 goto errout; 1691 status |= DO_SETLINK_MODIFIED; 1692 } 1693 1694 if (tb[IFLA_MTU]) { 1695 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1696 if (err < 0) 1697 goto errout; 1698 status |= DO_SETLINK_MODIFIED; 1699 } 1700 1701 if (tb[IFLA_GROUP]) { 1702 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1703 status |= DO_SETLINK_NOTIFY; 1704 } 1705 1706 /* 1707 * Interface selected by interface index but interface 1708 * name provided implies that a name change has been 1709 * requested. 1710 */ 1711 if (ifm->ifi_index > 0 && ifname[0]) { 1712 err = dev_change_name(dev, ifname); 1713 if (err < 0) 1714 goto errout; 1715 status |= DO_SETLINK_MODIFIED; 1716 } 1717 1718 if (tb[IFLA_IFALIAS]) { 1719 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1720 nla_len(tb[IFLA_IFALIAS])); 1721 if (err < 0) 1722 goto errout; 1723 status |= DO_SETLINK_NOTIFY; 1724 } 1725 1726 if (tb[IFLA_BROADCAST]) { 1727 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1728 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1729 } 1730 1731 if (ifm->ifi_flags || ifm->ifi_change) { 1732 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1733 if (err < 0) 1734 goto errout; 1735 } 1736 1737 if (tb[IFLA_MASTER]) { 1738 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1739 if (err) 1740 goto errout; 1741 status |= DO_SETLINK_MODIFIED; 1742 } 1743 1744 if (tb[IFLA_CARRIER]) { 1745 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1746 if (err) 1747 goto errout; 1748 status |= DO_SETLINK_MODIFIED; 1749 } 1750 1751 if (tb[IFLA_TXQLEN]) { 1752 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1753 1754 if (dev->tx_queue_len ^ value) 1755 status |= DO_SETLINK_NOTIFY; 1756 1757 dev->tx_queue_len = value; 1758 } 1759 1760 if (tb[IFLA_OPERSTATE]) 1761 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1762 1763 if (tb[IFLA_LINKMODE]) { 1764 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1765 1766 write_lock_bh(&dev_base_lock); 1767 if (dev->link_mode ^ value) 1768 status |= DO_SETLINK_NOTIFY; 1769 dev->link_mode = value; 1770 write_unlock_bh(&dev_base_lock); 1771 } 1772 1773 if (tb[IFLA_VFINFO_LIST]) { 1774 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 1775 struct nlattr *attr; 1776 int rem; 1777 1778 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1779 if (nla_type(attr) != IFLA_VF_INFO || 1780 nla_len(attr) < NLA_HDRLEN) { 1781 err = -EINVAL; 1782 goto errout; 1783 } 1784 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 1785 ifla_vf_policy); 1786 if (err < 0) 1787 goto errout; 1788 err = do_setvfinfo(dev, vfinfo); 1789 if (err < 0) 1790 goto errout; 1791 status |= DO_SETLINK_NOTIFY; 1792 } 1793 } 1794 err = 0; 1795 1796 if (tb[IFLA_VF_PORTS]) { 1797 struct nlattr *port[IFLA_PORT_MAX+1]; 1798 struct nlattr *attr; 1799 int vf; 1800 int rem; 1801 1802 err = -EOPNOTSUPP; 1803 if (!ops->ndo_set_vf_port) 1804 goto errout; 1805 1806 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1807 if (nla_type(attr) != IFLA_VF_PORT || 1808 nla_len(attr) < NLA_HDRLEN) { 1809 err = -EINVAL; 1810 goto errout; 1811 } 1812 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 1813 ifla_port_policy); 1814 if (err < 0) 1815 goto errout; 1816 if (!port[IFLA_PORT_VF]) { 1817 err = -EOPNOTSUPP; 1818 goto errout; 1819 } 1820 vf = nla_get_u32(port[IFLA_PORT_VF]); 1821 err = ops->ndo_set_vf_port(dev, vf, port); 1822 if (err < 0) 1823 goto errout; 1824 status |= DO_SETLINK_NOTIFY; 1825 } 1826 } 1827 err = 0; 1828 1829 if (tb[IFLA_PORT_SELF]) { 1830 struct nlattr *port[IFLA_PORT_MAX+1]; 1831 1832 err = nla_parse_nested(port, IFLA_PORT_MAX, 1833 tb[IFLA_PORT_SELF], ifla_port_policy); 1834 if (err < 0) 1835 goto errout; 1836 1837 err = -EOPNOTSUPP; 1838 if (ops->ndo_set_vf_port) 1839 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1840 if (err < 0) 1841 goto errout; 1842 status |= DO_SETLINK_NOTIFY; 1843 } 1844 1845 if (tb[IFLA_AF_SPEC]) { 1846 struct nlattr *af; 1847 int rem; 1848 1849 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1850 const struct rtnl_af_ops *af_ops; 1851 1852 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1853 BUG(); 1854 1855 err = af_ops->set_link_af(dev, af); 1856 if (err < 0) 1857 goto errout; 1858 1859 status |= DO_SETLINK_NOTIFY; 1860 } 1861 } 1862 err = 0; 1863 1864 errout: 1865 if (status & DO_SETLINK_MODIFIED) { 1866 if (status & DO_SETLINK_NOTIFY) 1867 netdev_state_change(dev); 1868 1869 if (err < 0) 1870 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", 1871 dev->name); 1872 } 1873 1874 return err; 1875 } 1876 1877 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1878 { 1879 struct net *net = sock_net(skb->sk); 1880 struct ifinfomsg *ifm; 1881 struct net_device *dev; 1882 int err; 1883 struct nlattr *tb[IFLA_MAX+1]; 1884 char ifname[IFNAMSIZ]; 1885 1886 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1887 if (err < 0) 1888 goto errout; 1889 1890 if (tb[IFLA_IFNAME]) 1891 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1892 else 1893 ifname[0] = '\0'; 1894 1895 err = -EINVAL; 1896 ifm = nlmsg_data(nlh); 1897 if (ifm->ifi_index > 0) 1898 dev = __dev_get_by_index(net, ifm->ifi_index); 1899 else if (tb[IFLA_IFNAME]) 1900 dev = __dev_get_by_name(net, ifname); 1901 else 1902 goto errout; 1903 1904 if (dev == NULL) { 1905 err = -ENODEV; 1906 goto errout; 1907 } 1908 1909 err = validate_linkmsg(dev, tb); 1910 if (err < 0) 1911 goto errout; 1912 1913 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 1914 errout: 1915 return err; 1916 } 1917 1918 static int rtnl_group_dellink(const struct net *net, int group) 1919 { 1920 struct net_device *dev, *aux; 1921 LIST_HEAD(list_kill); 1922 bool found = false; 1923 1924 if (!group) 1925 return -EPERM; 1926 1927 for_each_netdev(net, dev) { 1928 if (dev->group == group) { 1929 const struct rtnl_link_ops *ops; 1930 1931 found = true; 1932 ops = dev->rtnl_link_ops; 1933 if (!ops || !ops->dellink) 1934 return -EOPNOTSUPP; 1935 } 1936 } 1937 1938 if (!found) 1939 return -ENODEV; 1940 1941 for_each_netdev_safe(net, dev, aux) { 1942 if (dev->group == group) { 1943 const struct rtnl_link_ops *ops; 1944 1945 ops = dev->rtnl_link_ops; 1946 ops->dellink(dev, &list_kill); 1947 } 1948 } 1949 unregister_netdevice_many(&list_kill); 1950 1951 return 0; 1952 } 1953 1954 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1955 { 1956 struct net *net = sock_net(skb->sk); 1957 const struct rtnl_link_ops *ops; 1958 struct net_device *dev; 1959 struct ifinfomsg *ifm; 1960 char ifname[IFNAMSIZ]; 1961 struct nlattr *tb[IFLA_MAX+1]; 1962 int err; 1963 LIST_HEAD(list_kill); 1964 1965 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1966 if (err < 0) 1967 return err; 1968 1969 if (tb[IFLA_IFNAME]) 1970 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1971 1972 ifm = nlmsg_data(nlh); 1973 if (ifm->ifi_index > 0) 1974 dev = __dev_get_by_index(net, ifm->ifi_index); 1975 else if (tb[IFLA_IFNAME]) 1976 dev = __dev_get_by_name(net, ifname); 1977 else if (tb[IFLA_GROUP]) 1978 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 1979 else 1980 return -EINVAL; 1981 1982 if (!dev) 1983 return -ENODEV; 1984 1985 ops = dev->rtnl_link_ops; 1986 if (!ops || !ops->dellink) 1987 return -EOPNOTSUPP; 1988 1989 ops->dellink(dev, &list_kill); 1990 unregister_netdevice_many(&list_kill); 1991 return 0; 1992 } 1993 1994 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1995 { 1996 unsigned int old_flags; 1997 int err; 1998 1999 old_flags = dev->flags; 2000 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2001 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2002 if (err < 0) 2003 return err; 2004 } 2005 2006 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2007 2008 __dev_notify_flags(dev, old_flags, ~0U); 2009 return 0; 2010 } 2011 EXPORT_SYMBOL(rtnl_configure_link); 2012 2013 struct net_device *rtnl_create_link(struct net *net, 2014 const char *ifname, unsigned char name_assign_type, 2015 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2016 { 2017 int err; 2018 struct net_device *dev; 2019 unsigned int num_tx_queues = 1; 2020 unsigned int num_rx_queues = 1; 2021 2022 if (tb[IFLA_NUM_TX_QUEUES]) 2023 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2024 else if (ops->get_num_tx_queues) 2025 num_tx_queues = ops->get_num_tx_queues(); 2026 2027 if (tb[IFLA_NUM_RX_QUEUES]) 2028 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2029 else if (ops->get_num_rx_queues) 2030 num_rx_queues = ops->get_num_rx_queues(); 2031 2032 err = -ENOMEM; 2033 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2034 ops->setup, num_tx_queues, num_rx_queues); 2035 if (!dev) 2036 goto err; 2037 2038 dev_net_set(dev, net); 2039 dev->rtnl_link_ops = ops; 2040 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2041 2042 if (tb[IFLA_MTU]) 2043 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2044 if (tb[IFLA_ADDRESS]) { 2045 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2046 nla_len(tb[IFLA_ADDRESS])); 2047 dev->addr_assign_type = NET_ADDR_SET; 2048 } 2049 if (tb[IFLA_BROADCAST]) 2050 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2051 nla_len(tb[IFLA_BROADCAST])); 2052 if (tb[IFLA_TXQLEN]) 2053 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2054 if (tb[IFLA_OPERSTATE]) 2055 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2056 if (tb[IFLA_LINKMODE]) 2057 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2058 if (tb[IFLA_GROUP]) 2059 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2060 2061 return dev; 2062 2063 err: 2064 return ERR_PTR(err); 2065 } 2066 EXPORT_SYMBOL(rtnl_create_link); 2067 2068 static int rtnl_group_changelink(const struct sk_buff *skb, 2069 struct net *net, int group, 2070 struct ifinfomsg *ifm, 2071 struct nlattr **tb) 2072 { 2073 struct net_device *dev, *aux; 2074 int err; 2075 2076 for_each_netdev_safe(net, dev, aux) { 2077 if (dev->group == group) { 2078 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2079 if (err < 0) 2080 return err; 2081 } 2082 } 2083 2084 return 0; 2085 } 2086 2087 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2088 { 2089 struct net *net = sock_net(skb->sk); 2090 const struct rtnl_link_ops *ops; 2091 const struct rtnl_link_ops *m_ops = NULL; 2092 struct net_device *dev; 2093 struct net_device *master_dev = NULL; 2094 struct ifinfomsg *ifm; 2095 char kind[MODULE_NAME_LEN]; 2096 char ifname[IFNAMSIZ]; 2097 struct nlattr *tb[IFLA_MAX+1]; 2098 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2099 unsigned char name_assign_type = NET_NAME_USER; 2100 int err; 2101 2102 #ifdef CONFIG_MODULES 2103 replay: 2104 #endif 2105 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2106 if (err < 0) 2107 return err; 2108 2109 if (tb[IFLA_IFNAME]) 2110 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2111 else 2112 ifname[0] = '\0'; 2113 2114 ifm = nlmsg_data(nlh); 2115 if (ifm->ifi_index > 0) 2116 dev = __dev_get_by_index(net, ifm->ifi_index); 2117 else { 2118 if (ifname[0]) 2119 dev = __dev_get_by_name(net, ifname); 2120 else 2121 dev = NULL; 2122 } 2123 2124 if (dev) { 2125 master_dev = netdev_master_upper_dev_get(dev); 2126 if (master_dev) 2127 m_ops = master_dev->rtnl_link_ops; 2128 } 2129 2130 err = validate_linkmsg(dev, tb); 2131 if (err < 0) 2132 return err; 2133 2134 if (tb[IFLA_LINKINFO]) { 2135 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2136 tb[IFLA_LINKINFO], ifla_info_policy); 2137 if (err < 0) 2138 return err; 2139 } else 2140 memset(linkinfo, 0, sizeof(linkinfo)); 2141 2142 if (linkinfo[IFLA_INFO_KIND]) { 2143 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2144 ops = rtnl_link_ops_get(kind); 2145 } else { 2146 kind[0] = '\0'; 2147 ops = NULL; 2148 } 2149 2150 if (1) { 2151 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2152 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2153 struct nlattr **data = NULL; 2154 struct nlattr **slave_data = NULL; 2155 struct net *dest_net, *link_net = NULL; 2156 2157 if (ops) { 2158 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2159 err = nla_parse_nested(attr, ops->maxtype, 2160 linkinfo[IFLA_INFO_DATA], 2161 ops->policy); 2162 if (err < 0) 2163 return err; 2164 data = attr; 2165 } 2166 if (ops->validate) { 2167 err = ops->validate(tb, data); 2168 if (err < 0) 2169 return err; 2170 } 2171 } 2172 2173 if (m_ops) { 2174 if (m_ops->slave_maxtype && 2175 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2176 err = nla_parse_nested(slave_attr, 2177 m_ops->slave_maxtype, 2178 linkinfo[IFLA_INFO_SLAVE_DATA], 2179 m_ops->slave_policy); 2180 if (err < 0) 2181 return err; 2182 slave_data = slave_attr; 2183 } 2184 if (m_ops->slave_validate) { 2185 err = m_ops->slave_validate(tb, slave_data); 2186 if (err < 0) 2187 return err; 2188 } 2189 } 2190 2191 if (dev) { 2192 int status = 0; 2193 2194 if (nlh->nlmsg_flags & NLM_F_EXCL) 2195 return -EEXIST; 2196 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2197 return -EOPNOTSUPP; 2198 2199 if (linkinfo[IFLA_INFO_DATA]) { 2200 if (!ops || ops != dev->rtnl_link_ops || 2201 !ops->changelink) 2202 return -EOPNOTSUPP; 2203 2204 err = ops->changelink(dev, tb, data); 2205 if (err < 0) 2206 return err; 2207 status |= DO_SETLINK_NOTIFY; 2208 } 2209 2210 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2211 if (!m_ops || !m_ops->slave_changelink) 2212 return -EOPNOTSUPP; 2213 2214 err = m_ops->slave_changelink(master_dev, dev, 2215 tb, slave_data); 2216 if (err < 0) 2217 return err; 2218 status |= DO_SETLINK_NOTIFY; 2219 } 2220 2221 return do_setlink(skb, dev, ifm, tb, ifname, status); 2222 } 2223 2224 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2225 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2226 return rtnl_group_changelink(skb, net, 2227 nla_get_u32(tb[IFLA_GROUP]), 2228 ifm, tb); 2229 return -ENODEV; 2230 } 2231 2232 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2233 return -EOPNOTSUPP; 2234 2235 if (!ops) { 2236 #ifdef CONFIG_MODULES 2237 if (kind[0]) { 2238 __rtnl_unlock(); 2239 request_module("rtnl-link-%s", kind); 2240 rtnl_lock(); 2241 ops = rtnl_link_ops_get(kind); 2242 if (ops) 2243 goto replay; 2244 } 2245 #endif 2246 return -EOPNOTSUPP; 2247 } 2248 2249 if (!ops->setup) 2250 return -EOPNOTSUPP; 2251 2252 if (!ifname[0]) { 2253 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2254 name_assign_type = NET_NAME_ENUM; 2255 } 2256 2257 dest_net = rtnl_link_get_net(net, tb); 2258 if (IS_ERR(dest_net)) 2259 return PTR_ERR(dest_net); 2260 2261 err = -EPERM; 2262 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2263 goto out; 2264 2265 if (tb[IFLA_LINK_NETNSID]) { 2266 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2267 2268 link_net = get_net_ns_by_id(dest_net, id); 2269 if (!link_net) { 2270 err = -EINVAL; 2271 goto out; 2272 } 2273 err = -EPERM; 2274 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2275 goto out; 2276 } 2277 2278 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2279 name_assign_type, ops, tb); 2280 if (IS_ERR(dev)) { 2281 err = PTR_ERR(dev); 2282 goto out; 2283 } 2284 2285 dev->ifindex = ifm->ifi_index; 2286 2287 if (ops->newlink) { 2288 err = ops->newlink(link_net ? : net, dev, tb, data); 2289 /* Drivers should call free_netdev() in ->destructor 2290 * and unregister it on failure after registration 2291 * so that device could be finally freed in rtnl_unlock. 2292 */ 2293 if (err < 0) { 2294 /* If device is not registered at all, free it now */ 2295 if (dev->reg_state == NETREG_UNINITIALIZED) 2296 free_netdev(dev); 2297 goto out; 2298 } 2299 } else { 2300 err = register_netdevice(dev); 2301 if (err < 0) { 2302 free_netdev(dev); 2303 goto out; 2304 } 2305 } 2306 err = rtnl_configure_link(dev, ifm); 2307 if (err < 0) 2308 goto out_unregister; 2309 if (link_net) { 2310 err = dev_change_net_namespace(dev, dest_net, ifname); 2311 if (err < 0) 2312 goto out_unregister; 2313 } 2314 out: 2315 if (link_net) 2316 put_net(link_net); 2317 put_net(dest_net); 2318 return err; 2319 out_unregister: 2320 if (ops->newlink) { 2321 LIST_HEAD(list_kill); 2322 2323 ops->dellink(dev, &list_kill); 2324 unregister_netdevice_many(&list_kill); 2325 } else { 2326 unregister_netdevice(dev); 2327 } 2328 goto out; 2329 } 2330 } 2331 2332 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2333 { 2334 struct net *net = sock_net(skb->sk); 2335 struct ifinfomsg *ifm; 2336 char ifname[IFNAMSIZ]; 2337 struct nlattr *tb[IFLA_MAX+1]; 2338 struct net_device *dev = NULL; 2339 struct sk_buff *nskb; 2340 int err; 2341 u32 ext_filter_mask = 0; 2342 2343 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2344 if (err < 0) 2345 return err; 2346 2347 if (tb[IFLA_IFNAME]) 2348 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2349 2350 if (tb[IFLA_EXT_MASK]) 2351 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2352 2353 ifm = nlmsg_data(nlh); 2354 if (ifm->ifi_index > 0) 2355 dev = __dev_get_by_index(net, ifm->ifi_index); 2356 else if (tb[IFLA_IFNAME]) 2357 dev = __dev_get_by_name(net, ifname); 2358 else 2359 return -EINVAL; 2360 2361 if (dev == NULL) 2362 return -ENODEV; 2363 2364 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2365 if (nskb == NULL) 2366 return -ENOBUFS; 2367 2368 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2369 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2370 if (err < 0) { 2371 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2372 WARN_ON(err == -EMSGSIZE); 2373 kfree_skb(nskb); 2374 } else 2375 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2376 2377 return err; 2378 } 2379 2380 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2381 { 2382 struct net *net = sock_net(skb->sk); 2383 struct net_device *dev; 2384 struct nlattr *tb[IFLA_MAX+1]; 2385 u32 ext_filter_mask = 0; 2386 u16 min_ifinfo_dump_size = 0; 2387 int hdrlen; 2388 2389 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2390 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2391 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2392 2393 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2394 if (tb[IFLA_EXT_MASK]) 2395 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2396 } 2397 2398 if (!ext_filter_mask) 2399 return NLMSG_GOODSIZE; 2400 /* 2401 * traverse the list of net devices and compute the minimum 2402 * buffer size based upon the filter mask. 2403 */ 2404 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2405 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2406 if_nlmsg_size(dev, 2407 ext_filter_mask)); 2408 } 2409 2410 return min_ifinfo_dump_size; 2411 } 2412 2413 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2414 { 2415 int idx; 2416 int s_idx = cb->family; 2417 2418 if (s_idx == 0) 2419 s_idx = 1; 2420 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2421 int type = cb->nlh->nlmsg_type-RTM_BASE; 2422 if (idx < s_idx || idx == PF_PACKET) 2423 continue; 2424 if (rtnl_msg_handlers[idx] == NULL || 2425 rtnl_msg_handlers[idx][type].dumpit == NULL) 2426 continue; 2427 if (idx > s_idx) { 2428 memset(&cb->args[0], 0, sizeof(cb->args)); 2429 cb->prev_seq = 0; 2430 cb->seq = 0; 2431 } 2432 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2433 break; 2434 } 2435 cb->family = idx; 2436 2437 return skb->len; 2438 } 2439 2440 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2441 unsigned int change, gfp_t flags) 2442 { 2443 struct net *net = dev_net(dev); 2444 struct sk_buff *skb; 2445 int err = -ENOBUFS; 2446 size_t if_info_size; 2447 2448 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2449 if (skb == NULL) 2450 goto errout; 2451 2452 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2453 if (err < 0) { 2454 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2455 WARN_ON(err == -EMSGSIZE); 2456 kfree_skb(skb); 2457 goto errout; 2458 } 2459 return skb; 2460 errout: 2461 if (err < 0) 2462 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2463 return NULL; 2464 } 2465 2466 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2467 { 2468 struct net *net = dev_net(dev); 2469 2470 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2471 } 2472 2473 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2474 gfp_t flags) 2475 { 2476 struct sk_buff *skb; 2477 2478 if (dev->reg_state != NETREG_REGISTERED) 2479 return; 2480 2481 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2482 if (skb) 2483 rtmsg_ifinfo_send(skb, dev, flags); 2484 } 2485 EXPORT_SYMBOL(rtmsg_ifinfo); 2486 2487 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2488 struct net_device *dev, 2489 u8 *addr, u16 vid, u32 pid, u32 seq, 2490 int type, unsigned int flags, 2491 int nlflags) 2492 { 2493 struct nlmsghdr *nlh; 2494 struct ndmsg *ndm; 2495 2496 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2497 if (!nlh) 2498 return -EMSGSIZE; 2499 2500 ndm = nlmsg_data(nlh); 2501 ndm->ndm_family = AF_BRIDGE; 2502 ndm->ndm_pad1 = 0; 2503 ndm->ndm_pad2 = 0; 2504 ndm->ndm_flags = flags; 2505 ndm->ndm_type = 0; 2506 ndm->ndm_ifindex = dev->ifindex; 2507 ndm->ndm_state = NUD_PERMANENT; 2508 2509 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2510 goto nla_put_failure; 2511 if (vid) 2512 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2513 goto nla_put_failure; 2514 2515 nlmsg_end(skb, nlh); 2516 return 0; 2517 2518 nla_put_failure: 2519 nlmsg_cancel(skb, nlh); 2520 return -EMSGSIZE; 2521 } 2522 2523 static inline size_t rtnl_fdb_nlmsg_size(void) 2524 { 2525 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2526 } 2527 2528 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type) 2529 { 2530 struct net *net = dev_net(dev); 2531 struct sk_buff *skb; 2532 int err = -ENOBUFS; 2533 2534 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2535 if (!skb) 2536 goto errout; 2537 2538 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2539 0, 0, type, NTF_SELF, 0); 2540 if (err < 0) { 2541 kfree_skb(skb); 2542 goto errout; 2543 } 2544 2545 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2546 return; 2547 errout: 2548 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2549 } 2550 2551 /** 2552 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2553 */ 2554 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2555 struct nlattr *tb[], 2556 struct net_device *dev, 2557 const unsigned char *addr, u16 vid, 2558 u16 flags) 2559 { 2560 int err = -EINVAL; 2561 2562 /* If aging addresses are supported device will need to 2563 * implement its own handler for this. 2564 */ 2565 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2566 pr_info("%s: FDB only supports static addresses\n", dev->name); 2567 return err; 2568 } 2569 2570 if (vid) { 2571 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2572 return err; 2573 } 2574 2575 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2576 err = dev_uc_add_excl(dev, addr); 2577 else if (is_multicast_ether_addr(addr)) 2578 err = dev_mc_add_excl(dev, addr); 2579 2580 /* Only return duplicate errors if NLM_F_EXCL is set */ 2581 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2582 err = 0; 2583 2584 return err; 2585 } 2586 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2587 2588 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2589 { 2590 u16 vid = 0; 2591 2592 if (vlan_attr) { 2593 if (nla_len(vlan_attr) != sizeof(u16)) { 2594 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2595 return -EINVAL; 2596 } 2597 2598 vid = nla_get_u16(vlan_attr); 2599 2600 if (!vid || vid >= VLAN_VID_MASK) { 2601 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2602 vid); 2603 return -EINVAL; 2604 } 2605 } 2606 *p_vid = vid; 2607 return 0; 2608 } 2609 2610 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2611 { 2612 struct net *net = sock_net(skb->sk); 2613 struct ndmsg *ndm; 2614 struct nlattr *tb[NDA_MAX+1]; 2615 struct net_device *dev; 2616 u8 *addr; 2617 u16 vid; 2618 int err; 2619 2620 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2621 if (err < 0) 2622 return err; 2623 2624 ndm = nlmsg_data(nlh); 2625 if (ndm->ndm_ifindex == 0) { 2626 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2627 return -EINVAL; 2628 } 2629 2630 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2631 if (dev == NULL) { 2632 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2633 return -ENODEV; 2634 } 2635 2636 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2637 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2638 return -EINVAL; 2639 } 2640 2641 addr = nla_data(tb[NDA_LLADDR]); 2642 2643 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2644 if (err) 2645 return err; 2646 2647 err = -EOPNOTSUPP; 2648 2649 /* Support fdb on master device the net/bridge default case */ 2650 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2651 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2652 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2653 const struct net_device_ops *ops = br_dev->netdev_ops; 2654 2655 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2656 nlh->nlmsg_flags); 2657 if (err) 2658 goto out; 2659 else 2660 ndm->ndm_flags &= ~NTF_MASTER; 2661 } 2662 2663 /* Embedded bridge, macvlan, and any other device support */ 2664 if ((ndm->ndm_flags & NTF_SELF)) { 2665 if (dev->netdev_ops->ndo_fdb_add) 2666 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2667 vid, 2668 nlh->nlmsg_flags); 2669 else 2670 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 2671 nlh->nlmsg_flags); 2672 2673 if (!err) { 2674 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH); 2675 ndm->ndm_flags &= ~NTF_SELF; 2676 } 2677 } 2678 out: 2679 return err; 2680 } 2681 2682 /** 2683 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2684 */ 2685 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2686 struct nlattr *tb[], 2687 struct net_device *dev, 2688 const unsigned char *addr, u16 vid) 2689 { 2690 int err = -EINVAL; 2691 2692 /* If aging addresses are supported device will need to 2693 * implement its own handler for this. 2694 */ 2695 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2696 pr_info("%s: FDB only supports static addresses\n", dev->name); 2697 return err; 2698 } 2699 2700 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2701 err = dev_uc_del(dev, addr); 2702 else if (is_multicast_ether_addr(addr)) 2703 err = dev_mc_del(dev, addr); 2704 2705 return err; 2706 } 2707 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2708 2709 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2710 { 2711 struct net *net = sock_net(skb->sk); 2712 struct ndmsg *ndm; 2713 struct nlattr *tb[NDA_MAX+1]; 2714 struct net_device *dev; 2715 int err = -EINVAL; 2716 __u8 *addr; 2717 u16 vid; 2718 2719 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2720 return -EPERM; 2721 2722 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2723 if (err < 0) 2724 return err; 2725 2726 ndm = nlmsg_data(nlh); 2727 if (ndm->ndm_ifindex == 0) { 2728 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2729 return -EINVAL; 2730 } 2731 2732 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2733 if (dev == NULL) { 2734 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2735 return -ENODEV; 2736 } 2737 2738 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2739 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2740 return -EINVAL; 2741 } 2742 2743 addr = nla_data(tb[NDA_LLADDR]); 2744 2745 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2746 if (err) 2747 return err; 2748 2749 err = -EOPNOTSUPP; 2750 2751 /* Support fdb on master device the net/bridge default case */ 2752 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2753 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2754 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2755 const struct net_device_ops *ops = br_dev->netdev_ops; 2756 2757 if (ops->ndo_fdb_del) 2758 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 2759 2760 if (err) 2761 goto out; 2762 else 2763 ndm->ndm_flags &= ~NTF_MASTER; 2764 } 2765 2766 /* Embedded bridge, macvlan, and any other device support */ 2767 if (ndm->ndm_flags & NTF_SELF) { 2768 if (dev->netdev_ops->ndo_fdb_del) 2769 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 2770 vid); 2771 else 2772 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 2773 2774 if (!err) { 2775 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH); 2776 ndm->ndm_flags &= ~NTF_SELF; 2777 } 2778 } 2779 out: 2780 return err; 2781 } 2782 2783 static int nlmsg_populate_fdb(struct sk_buff *skb, 2784 struct netlink_callback *cb, 2785 struct net_device *dev, 2786 int *idx, 2787 struct netdev_hw_addr_list *list) 2788 { 2789 struct netdev_hw_addr *ha; 2790 int err; 2791 u32 portid, seq; 2792 2793 portid = NETLINK_CB(cb->skb).portid; 2794 seq = cb->nlh->nlmsg_seq; 2795 2796 list_for_each_entry(ha, &list->list, list) { 2797 if (*idx < cb->args[0]) 2798 goto skip; 2799 2800 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 2801 portid, seq, 2802 RTM_NEWNEIGH, NTF_SELF, 2803 NLM_F_MULTI); 2804 if (err < 0) 2805 return err; 2806 skip: 2807 *idx += 1; 2808 } 2809 return 0; 2810 } 2811 2812 /** 2813 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2814 * @nlh: netlink message header 2815 * @dev: netdevice 2816 * 2817 * Default netdevice operation to dump the existing unicast address list. 2818 * Returns number of addresses from list put in skb. 2819 */ 2820 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2821 struct netlink_callback *cb, 2822 struct net_device *dev, 2823 struct net_device *filter_dev, 2824 int idx) 2825 { 2826 int err; 2827 2828 netif_addr_lock_bh(dev); 2829 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2830 if (err) 2831 goto out; 2832 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2833 out: 2834 netif_addr_unlock_bh(dev); 2835 return idx; 2836 } 2837 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2838 2839 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2840 { 2841 struct net_device *dev; 2842 struct nlattr *tb[IFLA_MAX+1]; 2843 struct net_device *br_dev = NULL; 2844 const struct net_device_ops *ops = NULL; 2845 const struct net_device_ops *cops = NULL; 2846 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2847 struct net *net = sock_net(skb->sk); 2848 int brport_idx = 0; 2849 int br_idx = 0; 2850 int idx = 0; 2851 2852 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 2853 ifla_policy) == 0) { 2854 if (tb[IFLA_MASTER]) 2855 br_idx = nla_get_u32(tb[IFLA_MASTER]); 2856 } 2857 2858 brport_idx = ifm->ifi_index; 2859 2860 if (br_idx) { 2861 br_dev = __dev_get_by_index(net, br_idx); 2862 if (!br_dev) 2863 return -ENODEV; 2864 2865 ops = br_dev->netdev_ops; 2866 } 2867 2868 for_each_netdev(net, dev) { 2869 if (brport_idx && (dev->ifindex != brport_idx)) 2870 continue; 2871 2872 if (!br_idx) { /* user did not specify a specific bridge */ 2873 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2874 br_dev = netdev_master_upper_dev_get(dev); 2875 cops = br_dev->netdev_ops; 2876 } 2877 2878 } else { 2879 if (dev != br_dev && 2880 !(dev->priv_flags & IFF_BRIDGE_PORT)) 2881 continue; 2882 2883 if (br_dev != netdev_master_upper_dev_get(dev) && 2884 !(dev->priv_flags & IFF_EBRIDGE)) 2885 continue; 2886 2887 cops = ops; 2888 } 2889 2890 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2891 if (cops && cops->ndo_fdb_dump) 2892 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 2893 idx); 2894 } 2895 2896 if (dev->netdev_ops->ndo_fdb_dump) 2897 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL, 2898 idx); 2899 else 2900 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 2901 2902 cops = NULL; 2903 } 2904 2905 cb->args[0] = idx; 2906 return skb->len; 2907 } 2908 2909 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 2910 unsigned int attrnum, unsigned int flag) 2911 { 2912 if (mask & flag) 2913 return nla_put_u8(skb, attrnum, !!(flags & flag)); 2914 return 0; 2915 } 2916 2917 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2918 struct net_device *dev, u16 mode, 2919 u32 flags, u32 mask, int nlflags, 2920 u32 filter_mask, 2921 int (*vlan_fill)(struct sk_buff *skb, 2922 struct net_device *dev, 2923 u32 filter_mask)) 2924 { 2925 struct nlmsghdr *nlh; 2926 struct ifinfomsg *ifm; 2927 struct nlattr *br_afspec; 2928 struct nlattr *protinfo; 2929 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2930 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2931 int err = 0; 2932 2933 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 2934 if (nlh == NULL) 2935 return -EMSGSIZE; 2936 2937 ifm = nlmsg_data(nlh); 2938 ifm->ifi_family = AF_BRIDGE; 2939 ifm->__ifi_pad = 0; 2940 ifm->ifi_type = dev->type; 2941 ifm->ifi_index = dev->ifindex; 2942 ifm->ifi_flags = dev_get_flags(dev); 2943 ifm->ifi_change = 0; 2944 2945 2946 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2947 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2948 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2949 (br_dev && 2950 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2951 (dev->addr_len && 2952 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2953 (dev->ifindex != dev_get_iflink(dev) && 2954 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 2955 goto nla_put_failure; 2956 2957 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2958 if (!br_afspec) 2959 goto nla_put_failure; 2960 2961 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 2962 nla_nest_cancel(skb, br_afspec); 2963 goto nla_put_failure; 2964 } 2965 2966 if (mode != BRIDGE_MODE_UNDEF) { 2967 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2968 nla_nest_cancel(skb, br_afspec); 2969 goto nla_put_failure; 2970 } 2971 } 2972 if (vlan_fill) { 2973 err = vlan_fill(skb, dev, filter_mask); 2974 if (err) { 2975 nla_nest_cancel(skb, br_afspec); 2976 goto nla_put_failure; 2977 } 2978 } 2979 nla_nest_end(skb, br_afspec); 2980 2981 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 2982 if (!protinfo) 2983 goto nla_put_failure; 2984 2985 if (brport_nla_put_flag(skb, flags, mask, 2986 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 2987 brport_nla_put_flag(skb, flags, mask, 2988 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 2989 brport_nla_put_flag(skb, flags, mask, 2990 IFLA_BRPORT_FAST_LEAVE, 2991 BR_MULTICAST_FAST_LEAVE) || 2992 brport_nla_put_flag(skb, flags, mask, 2993 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 2994 brport_nla_put_flag(skb, flags, mask, 2995 IFLA_BRPORT_LEARNING, BR_LEARNING) || 2996 brport_nla_put_flag(skb, flags, mask, 2997 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 2998 brport_nla_put_flag(skb, flags, mask, 2999 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3000 brport_nla_put_flag(skb, flags, mask, 3001 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3002 nla_nest_cancel(skb, protinfo); 3003 goto nla_put_failure; 3004 } 3005 3006 nla_nest_end(skb, protinfo); 3007 3008 nlmsg_end(skb, nlh); 3009 return 0; 3010 nla_put_failure: 3011 nlmsg_cancel(skb, nlh); 3012 return err ? err : -EMSGSIZE; 3013 } 3014 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3015 3016 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3017 { 3018 struct net *net = sock_net(skb->sk); 3019 struct net_device *dev; 3020 int idx = 0; 3021 u32 portid = NETLINK_CB(cb->skb).portid; 3022 u32 seq = cb->nlh->nlmsg_seq; 3023 u32 filter_mask = 0; 3024 3025 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3026 struct nlattr *extfilt; 3027 3028 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3029 IFLA_EXT_MASK); 3030 if (extfilt) { 3031 if (nla_len(extfilt) < sizeof(filter_mask)) 3032 return -EINVAL; 3033 3034 filter_mask = nla_get_u32(extfilt); 3035 } 3036 } 3037 3038 rcu_read_lock(); 3039 for_each_netdev_rcu(net, dev) { 3040 const struct net_device_ops *ops = dev->netdev_ops; 3041 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3042 3043 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3044 if (idx >= cb->args[0] && 3045 br_dev->netdev_ops->ndo_bridge_getlink( 3046 skb, portid, seq, dev, filter_mask, 3047 NLM_F_MULTI) < 0) 3048 break; 3049 idx++; 3050 } 3051 3052 if (ops->ndo_bridge_getlink) { 3053 if (idx >= cb->args[0] && 3054 ops->ndo_bridge_getlink(skb, portid, seq, dev, 3055 filter_mask, 3056 NLM_F_MULTI) < 0) 3057 break; 3058 idx++; 3059 } 3060 } 3061 rcu_read_unlock(); 3062 cb->args[0] = idx; 3063 3064 return skb->len; 3065 } 3066 3067 static inline size_t bridge_nlmsg_size(void) 3068 { 3069 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3070 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3071 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3072 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3073 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3074 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3075 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3076 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3077 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3078 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3079 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3080 } 3081 3082 static int rtnl_bridge_notify(struct net_device *dev) 3083 { 3084 struct net *net = dev_net(dev); 3085 struct sk_buff *skb; 3086 int err = -EOPNOTSUPP; 3087 3088 if (!dev->netdev_ops->ndo_bridge_getlink) 3089 return 0; 3090 3091 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3092 if (!skb) { 3093 err = -ENOMEM; 3094 goto errout; 3095 } 3096 3097 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3098 if (err < 0) 3099 goto errout; 3100 3101 if (!skb->len) 3102 goto errout; 3103 3104 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3105 return 0; 3106 errout: 3107 WARN_ON(err == -EMSGSIZE); 3108 kfree_skb(skb); 3109 if (err) 3110 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3111 return err; 3112 } 3113 3114 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3115 { 3116 struct net *net = sock_net(skb->sk); 3117 struct ifinfomsg *ifm; 3118 struct net_device *dev; 3119 struct nlattr *br_spec, *attr = NULL; 3120 int rem, err = -EOPNOTSUPP; 3121 u16 flags = 0; 3122 bool have_flags = false; 3123 3124 if (nlmsg_len(nlh) < sizeof(*ifm)) 3125 return -EINVAL; 3126 3127 ifm = nlmsg_data(nlh); 3128 if (ifm->ifi_family != AF_BRIDGE) 3129 return -EPFNOSUPPORT; 3130 3131 dev = __dev_get_by_index(net, ifm->ifi_index); 3132 if (!dev) { 3133 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3134 return -ENODEV; 3135 } 3136 3137 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3138 if (br_spec) { 3139 nla_for_each_nested(attr, br_spec, rem) { 3140 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3141 if (nla_len(attr) < sizeof(flags)) 3142 return -EINVAL; 3143 3144 have_flags = true; 3145 flags = nla_get_u16(attr); 3146 break; 3147 } 3148 } 3149 } 3150 3151 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3152 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3153 3154 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3155 err = -EOPNOTSUPP; 3156 goto out; 3157 } 3158 3159 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3160 if (err) 3161 goto out; 3162 3163 flags &= ~BRIDGE_FLAGS_MASTER; 3164 } 3165 3166 if ((flags & BRIDGE_FLAGS_SELF)) { 3167 if (!dev->netdev_ops->ndo_bridge_setlink) 3168 err = -EOPNOTSUPP; 3169 else 3170 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3171 flags); 3172 if (!err) { 3173 flags &= ~BRIDGE_FLAGS_SELF; 3174 3175 /* Generate event to notify upper layer of bridge 3176 * change 3177 */ 3178 err = rtnl_bridge_notify(dev); 3179 } 3180 } 3181 3182 if (have_flags) 3183 memcpy(nla_data(attr), &flags, sizeof(flags)); 3184 out: 3185 return err; 3186 } 3187 3188 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3189 { 3190 struct net *net = sock_net(skb->sk); 3191 struct ifinfomsg *ifm; 3192 struct net_device *dev; 3193 struct nlattr *br_spec, *attr = NULL; 3194 int rem, err = -EOPNOTSUPP; 3195 u16 flags = 0; 3196 bool have_flags = false; 3197 3198 if (nlmsg_len(nlh) < sizeof(*ifm)) 3199 return -EINVAL; 3200 3201 ifm = nlmsg_data(nlh); 3202 if (ifm->ifi_family != AF_BRIDGE) 3203 return -EPFNOSUPPORT; 3204 3205 dev = __dev_get_by_index(net, ifm->ifi_index); 3206 if (!dev) { 3207 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3208 return -ENODEV; 3209 } 3210 3211 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3212 if (br_spec) { 3213 nla_for_each_nested(attr, br_spec, rem) { 3214 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3215 if (nla_len(attr) < sizeof(flags)) 3216 return -EINVAL; 3217 3218 have_flags = true; 3219 flags = nla_get_u16(attr); 3220 break; 3221 } 3222 } 3223 } 3224 3225 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3226 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3227 3228 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3229 err = -EOPNOTSUPP; 3230 goto out; 3231 } 3232 3233 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3234 if (err) 3235 goto out; 3236 3237 flags &= ~BRIDGE_FLAGS_MASTER; 3238 } 3239 3240 if ((flags & BRIDGE_FLAGS_SELF)) { 3241 if (!dev->netdev_ops->ndo_bridge_dellink) 3242 err = -EOPNOTSUPP; 3243 else 3244 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3245 flags); 3246 3247 if (!err) { 3248 flags &= ~BRIDGE_FLAGS_SELF; 3249 3250 /* Generate event to notify upper layer of bridge 3251 * change 3252 */ 3253 err = rtnl_bridge_notify(dev); 3254 } 3255 } 3256 3257 if (have_flags) 3258 memcpy(nla_data(attr), &flags, sizeof(flags)); 3259 out: 3260 return err; 3261 } 3262 3263 /* Process one rtnetlink message. */ 3264 3265 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3266 { 3267 struct net *net = sock_net(skb->sk); 3268 rtnl_doit_func doit; 3269 int sz_idx, kind; 3270 int family; 3271 int type; 3272 int err; 3273 3274 type = nlh->nlmsg_type; 3275 if (type > RTM_MAX) 3276 return -EOPNOTSUPP; 3277 3278 type -= RTM_BASE; 3279 3280 /* All the messages must have at least 1 byte length */ 3281 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3282 return 0; 3283 3284 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3285 sz_idx = type>>2; 3286 kind = type&3; 3287 3288 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3289 return -EPERM; 3290 3291 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 3292 struct sock *rtnl; 3293 rtnl_dumpit_func dumpit; 3294 rtnl_calcit_func calcit; 3295 u16 min_dump_alloc = 0; 3296 3297 dumpit = rtnl_get_dumpit(family, type); 3298 if (dumpit == NULL) 3299 return -EOPNOTSUPP; 3300 calcit = rtnl_get_calcit(family, type); 3301 if (calcit) 3302 min_dump_alloc = calcit(skb, nlh); 3303 3304 __rtnl_unlock(); 3305 rtnl = net->rtnl; 3306 { 3307 struct netlink_dump_control c = { 3308 .dump = dumpit, 3309 .min_dump_alloc = min_dump_alloc, 3310 }; 3311 err = netlink_dump_start(rtnl, skb, nlh, &c); 3312 } 3313 rtnl_lock(); 3314 return err; 3315 } 3316 3317 doit = rtnl_get_doit(family, type); 3318 if (doit == NULL) 3319 return -EOPNOTSUPP; 3320 3321 return doit(skb, nlh); 3322 } 3323 3324 static void rtnetlink_rcv(struct sk_buff *skb) 3325 { 3326 rtnl_lock(); 3327 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 3328 rtnl_unlock(); 3329 } 3330 3331 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 3332 { 3333 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3334 3335 switch (event) { 3336 case NETDEV_UP: 3337 case NETDEV_DOWN: 3338 case NETDEV_PRE_UP: 3339 case NETDEV_POST_INIT: 3340 case NETDEV_REGISTER: 3341 case NETDEV_CHANGE: 3342 case NETDEV_PRE_TYPE_CHANGE: 3343 case NETDEV_GOING_DOWN: 3344 case NETDEV_UNREGISTER: 3345 case NETDEV_UNREGISTER_FINAL: 3346 case NETDEV_RELEASE: 3347 case NETDEV_JOIN: 3348 case NETDEV_BONDING_INFO: 3349 break; 3350 default: 3351 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3352 break; 3353 } 3354 return NOTIFY_DONE; 3355 } 3356 3357 static struct notifier_block rtnetlink_dev_notifier = { 3358 .notifier_call = rtnetlink_event, 3359 }; 3360 3361 3362 static int __net_init rtnetlink_net_init(struct net *net) 3363 { 3364 struct sock *sk; 3365 struct netlink_kernel_cfg cfg = { 3366 .groups = RTNLGRP_MAX, 3367 .input = rtnetlink_rcv, 3368 .cb_mutex = &rtnl_mutex, 3369 .flags = NL_CFG_F_NONROOT_RECV, 3370 }; 3371 3372 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3373 if (!sk) 3374 return -ENOMEM; 3375 net->rtnl = sk; 3376 return 0; 3377 } 3378 3379 static void __net_exit rtnetlink_net_exit(struct net *net) 3380 { 3381 netlink_kernel_release(net->rtnl); 3382 net->rtnl = NULL; 3383 } 3384 3385 static struct pernet_operations rtnetlink_net_ops = { 3386 .init = rtnetlink_net_init, 3387 .exit = rtnetlink_net_exit, 3388 }; 3389 3390 void __init rtnetlink_init(void) 3391 { 3392 if (register_pernet_subsys(&rtnetlink_net_ops)) 3393 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3394 3395 register_netdevice_notifier(&rtnetlink_dev_notifier); 3396 3397 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3398 rtnl_dump_ifinfo, rtnl_calcit); 3399 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3400 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3401 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3402 3403 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3404 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3405 3406 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3407 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3408 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3409 3410 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3411 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3412 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3413 } 3414 3415