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 + nla_total_size(1); /* IFLA_PROTO_DOWN */ 901 902 } 903 904 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 905 { 906 struct nlattr *vf_ports; 907 struct nlattr *vf_port; 908 int vf; 909 int err; 910 911 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 912 if (!vf_ports) 913 return -EMSGSIZE; 914 915 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 916 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 917 if (!vf_port) 918 goto nla_put_failure; 919 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 920 goto nla_put_failure; 921 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 922 if (err == -EMSGSIZE) 923 goto nla_put_failure; 924 if (err) { 925 nla_nest_cancel(skb, vf_port); 926 continue; 927 } 928 nla_nest_end(skb, vf_port); 929 } 930 931 nla_nest_end(skb, vf_ports); 932 933 return 0; 934 935 nla_put_failure: 936 nla_nest_cancel(skb, vf_ports); 937 return -EMSGSIZE; 938 } 939 940 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 941 { 942 struct nlattr *port_self; 943 int err; 944 945 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 946 if (!port_self) 947 return -EMSGSIZE; 948 949 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 950 if (err) { 951 nla_nest_cancel(skb, port_self); 952 return (err == -EMSGSIZE) ? err : 0; 953 } 954 955 nla_nest_end(skb, port_self); 956 957 return 0; 958 } 959 960 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 961 u32 ext_filter_mask) 962 { 963 int err; 964 965 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 966 !(ext_filter_mask & RTEXT_FILTER_VF)) 967 return 0; 968 969 err = rtnl_port_self_fill(skb, dev); 970 if (err) 971 return err; 972 973 if (dev_num_vf(dev->dev.parent)) { 974 err = rtnl_vf_ports_fill(skb, dev); 975 if (err) 976 return err; 977 } 978 979 return 0; 980 } 981 982 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 983 { 984 int err; 985 struct netdev_phys_item_id ppid; 986 987 err = dev_get_phys_port_id(dev, &ppid); 988 if (err) { 989 if (err == -EOPNOTSUPP) 990 return 0; 991 return err; 992 } 993 994 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 995 return -EMSGSIZE; 996 997 return 0; 998 } 999 1000 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1001 { 1002 char name[IFNAMSIZ]; 1003 int err; 1004 1005 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1006 if (err) { 1007 if (err == -EOPNOTSUPP) 1008 return 0; 1009 return err; 1010 } 1011 1012 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 1013 return -EMSGSIZE; 1014 1015 return 0; 1016 } 1017 1018 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1019 { 1020 int err; 1021 struct switchdev_attr attr = { 1022 .id = SWITCHDEV_ATTR_PORT_PARENT_ID, 1023 .flags = SWITCHDEV_F_NO_RECURSE, 1024 }; 1025 1026 err = switchdev_port_attr_get(dev, &attr); 1027 if (err) { 1028 if (err == -EOPNOTSUPP) 1029 return 0; 1030 return err; 1031 } 1032 1033 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1034 attr.u.ppid.id)) 1035 return -EMSGSIZE; 1036 1037 return 0; 1038 } 1039 1040 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1041 int type, u32 pid, u32 seq, u32 change, 1042 unsigned int flags, u32 ext_filter_mask) 1043 { 1044 struct ifinfomsg *ifm; 1045 struct nlmsghdr *nlh; 1046 struct rtnl_link_stats64 temp; 1047 const struct rtnl_link_stats64 *stats; 1048 struct nlattr *attr, *af_spec; 1049 struct rtnl_af_ops *af_ops; 1050 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1051 1052 ASSERT_RTNL(); 1053 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1054 if (nlh == NULL) 1055 return -EMSGSIZE; 1056 1057 ifm = nlmsg_data(nlh); 1058 ifm->ifi_family = AF_UNSPEC; 1059 ifm->__ifi_pad = 0; 1060 ifm->ifi_type = dev->type; 1061 ifm->ifi_index = dev->ifindex; 1062 ifm->ifi_flags = dev_get_flags(dev); 1063 ifm->ifi_change = change; 1064 1065 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1066 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1067 nla_put_u8(skb, IFLA_OPERSTATE, 1068 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1069 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1070 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1071 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1072 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1073 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1074 #ifdef CONFIG_RPS 1075 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1076 #endif 1077 (dev->ifindex != dev_get_iflink(dev) && 1078 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1079 (upper_dev && 1080 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1081 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1082 (dev->qdisc && 1083 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1084 (dev->ifalias && 1085 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1086 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1087 atomic_read(&dev->carrier_changes)) || 1088 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1089 goto nla_put_failure; 1090 1091 if (1) { 1092 struct rtnl_link_ifmap map = { 1093 .mem_start = dev->mem_start, 1094 .mem_end = dev->mem_end, 1095 .base_addr = dev->base_addr, 1096 .irq = dev->irq, 1097 .dma = dev->dma, 1098 .port = dev->if_port, 1099 }; 1100 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1101 goto nla_put_failure; 1102 } 1103 1104 if (dev->addr_len) { 1105 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1106 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1107 goto nla_put_failure; 1108 } 1109 1110 if (rtnl_phys_port_id_fill(skb, dev)) 1111 goto nla_put_failure; 1112 1113 if (rtnl_phys_port_name_fill(skb, dev)) 1114 goto nla_put_failure; 1115 1116 if (rtnl_phys_switch_id_fill(skb, dev)) 1117 goto nla_put_failure; 1118 1119 attr = nla_reserve(skb, IFLA_STATS, 1120 sizeof(struct rtnl_link_stats)); 1121 if (attr == NULL) 1122 goto nla_put_failure; 1123 1124 stats = dev_get_stats(dev, &temp); 1125 copy_rtnl_link_stats(nla_data(attr), stats); 1126 1127 attr = nla_reserve(skb, IFLA_STATS64, 1128 sizeof(struct rtnl_link_stats64)); 1129 if (attr == NULL) 1130 goto nla_put_failure; 1131 copy_rtnl_link_stats64(nla_data(attr), stats); 1132 1133 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1134 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1135 goto nla_put_failure; 1136 1137 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 1138 && (ext_filter_mask & RTEXT_FILTER_VF)) { 1139 int i; 1140 1141 struct nlattr *vfinfo, *vf, *vfstats; 1142 int num_vfs = dev_num_vf(dev->dev.parent); 1143 1144 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1145 if (!vfinfo) 1146 goto nla_put_failure; 1147 for (i = 0; i < num_vfs; i++) { 1148 struct ifla_vf_info ivi; 1149 struct ifla_vf_mac vf_mac; 1150 struct ifla_vf_vlan vf_vlan; 1151 struct ifla_vf_rate vf_rate; 1152 struct ifla_vf_tx_rate vf_tx_rate; 1153 struct ifla_vf_spoofchk vf_spoofchk; 1154 struct ifla_vf_link_state vf_linkstate; 1155 struct ifla_vf_rss_query_en vf_rss_query_en; 1156 struct ifla_vf_stats vf_stats; 1157 1158 /* 1159 * Not all SR-IOV capable drivers support the 1160 * spoofcheck and "RSS query enable" query. Preset to 1161 * -1 so the user space tool can detect that the driver 1162 * didn't report anything. 1163 */ 1164 ivi.spoofchk = -1; 1165 ivi.rss_query_en = -1; 1166 memset(ivi.mac, 0, sizeof(ivi.mac)); 1167 /* The default value for VF link state is "auto" 1168 * IFLA_VF_LINK_STATE_AUTO which equals zero 1169 */ 1170 ivi.linkstate = 0; 1171 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 1172 break; 1173 vf_mac.vf = 1174 vf_vlan.vf = 1175 vf_rate.vf = 1176 vf_tx_rate.vf = 1177 vf_spoofchk.vf = 1178 vf_linkstate.vf = 1179 vf_rss_query_en.vf = ivi.vf; 1180 1181 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1182 vf_vlan.vlan = ivi.vlan; 1183 vf_vlan.qos = ivi.qos; 1184 vf_tx_rate.rate = ivi.max_tx_rate; 1185 vf_rate.min_tx_rate = ivi.min_tx_rate; 1186 vf_rate.max_tx_rate = ivi.max_tx_rate; 1187 vf_spoofchk.setting = ivi.spoofchk; 1188 vf_linkstate.link_state = ivi.linkstate; 1189 vf_rss_query_en.setting = ivi.rss_query_en; 1190 vf = nla_nest_start(skb, IFLA_VF_INFO); 1191 if (!vf) { 1192 nla_nest_cancel(skb, vfinfo); 1193 goto nla_put_failure; 1194 } 1195 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1196 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1197 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1198 &vf_rate) || 1199 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1200 &vf_tx_rate) || 1201 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1202 &vf_spoofchk) || 1203 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1204 &vf_linkstate) || 1205 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1206 sizeof(vf_rss_query_en), 1207 &vf_rss_query_en)) 1208 goto nla_put_failure; 1209 memset(&vf_stats, 0, sizeof(vf_stats)); 1210 if (dev->netdev_ops->ndo_get_vf_stats) 1211 dev->netdev_ops->ndo_get_vf_stats(dev, i, 1212 &vf_stats); 1213 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1214 if (!vfstats) { 1215 nla_nest_cancel(skb, vf); 1216 nla_nest_cancel(skb, vfinfo); 1217 goto nla_put_failure; 1218 } 1219 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS, 1220 vf_stats.rx_packets) || 1221 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS, 1222 vf_stats.tx_packets) || 1223 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES, 1224 vf_stats.rx_bytes) || 1225 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES, 1226 vf_stats.tx_bytes) || 1227 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST, 1228 vf_stats.broadcast) || 1229 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST, 1230 vf_stats.multicast)) 1231 goto nla_put_failure; 1232 nla_nest_end(skb, vfstats); 1233 nla_nest_end(skb, vf); 1234 } 1235 nla_nest_end(skb, vfinfo); 1236 } 1237 1238 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1239 goto nla_put_failure; 1240 1241 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1242 if (rtnl_link_fill(skb, dev) < 0) 1243 goto nla_put_failure; 1244 } 1245 1246 if (dev->rtnl_link_ops && 1247 dev->rtnl_link_ops->get_link_net) { 1248 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1249 1250 if (!net_eq(dev_net(dev), link_net)) { 1251 int id = peernet2id_alloc(dev_net(dev), link_net); 1252 1253 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1254 goto nla_put_failure; 1255 } 1256 } 1257 1258 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1259 goto nla_put_failure; 1260 1261 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1262 if (af_ops->fill_link_af) { 1263 struct nlattr *af; 1264 int err; 1265 1266 if (!(af = nla_nest_start(skb, af_ops->family))) 1267 goto nla_put_failure; 1268 1269 err = af_ops->fill_link_af(skb, dev); 1270 1271 /* 1272 * Caller may return ENODATA to indicate that there 1273 * was no data to be dumped. This is not an error, it 1274 * means we should trim the attribute header and 1275 * continue. 1276 */ 1277 if (err == -ENODATA) 1278 nla_nest_cancel(skb, af); 1279 else if (err < 0) 1280 goto nla_put_failure; 1281 1282 nla_nest_end(skb, af); 1283 } 1284 } 1285 1286 nla_nest_end(skb, af_spec); 1287 1288 nlmsg_end(skb, nlh); 1289 return 0; 1290 1291 nla_put_failure: 1292 nlmsg_cancel(skb, nlh); 1293 return -EMSGSIZE; 1294 } 1295 1296 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1297 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1298 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1299 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1300 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1301 [IFLA_MTU] = { .type = NLA_U32 }, 1302 [IFLA_LINK] = { .type = NLA_U32 }, 1303 [IFLA_MASTER] = { .type = NLA_U32 }, 1304 [IFLA_CARRIER] = { .type = NLA_U8 }, 1305 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1306 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1307 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1308 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1309 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1310 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1311 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1312 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1313 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1314 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1315 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1316 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1317 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1318 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1319 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1320 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1321 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1322 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1323 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1324 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1325 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1326 }; 1327 1328 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1329 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1330 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1331 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1332 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1333 }; 1334 1335 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1336 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1337 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1338 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1339 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1340 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1341 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1342 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1343 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1344 }; 1345 1346 static const struct nla_policy ifla_vf_stats_policy[IFLA_VF_STATS_MAX + 1] = { 1347 [IFLA_VF_STATS_RX_PACKETS] = { .type = NLA_U64 }, 1348 [IFLA_VF_STATS_TX_PACKETS] = { .type = NLA_U64 }, 1349 [IFLA_VF_STATS_RX_BYTES] = { .type = NLA_U64 }, 1350 [IFLA_VF_STATS_TX_BYTES] = { .type = NLA_U64 }, 1351 [IFLA_VF_STATS_BROADCAST] = { .type = NLA_U64 }, 1352 [IFLA_VF_STATS_MULTICAST] = { .type = NLA_U64 }, 1353 }; 1354 1355 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1356 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1357 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1358 .len = PORT_PROFILE_MAX }, 1359 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1360 .len = sizeof(struct ifla_port_vsi)}, 1361 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1362 .len = PORT_UUID_MAX }, 1363 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1364 .len = PORT_UUID_MAX }, 1365 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1366 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1367 }; 1368 1369 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1370 { 1371 struct net *net = sock_net(skb->sk); 1372 int h, s_h; 1373 int idx = 0, s_idx; 1374 struct net_device *dev; 1375 struct hlist_head *head; 1376 struct nlattr *tb[IFLA_MAX+1]; 1377 u32 ext_filter_mask = 0; 1378 int err; 1379 int hdrlen; 1380 1381 s_h = cb->args[0]; 1382 s_idx = cb->args[1]; 1383 1384 cb->seq = net->dev_base_seq; 1385 1386 /* A hack to preserve kernel<->userspace interface. 1387 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1388 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1389 * what iproute2 < v3.9.0 used. 1390 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1391 * attribute, its netlink message is shorter than struct ifinfomsg. 1392 */ 1393 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1394 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1395 1396 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1397 1398 if (tb[IFLA_EXT_MASK]) 1399 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1400 } 1401 1402 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1403 idx = 0; 1404 head = &net->dev_index_head[h]; 1405 hlist_for_each_entry(dev, head, index_hlist) { 1406 if (idx < s_idx) 1407 goto cont; 1408 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1409 NETLINK_CB(cb->skb).portid, 1410 cb->nlh->nlmsg_seq, 0, 1411 NLM_F_MULTI, 1412 ext_filter_mask); 1413 /* If we ran out of room on the first message, 1414 * we're in trouble 1415 */ 1416 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1417 1418 if (err < 0) 1419 goto out; 1420 1421 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1422 cont: 1423 idx++; 1424 } 1425 } 1426 out: 1427 cb->args[1] = idx; 1428 cb->args[0] = h; 1429 1430 return skb->len; 1431 } 1432 1433 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1434 { 1435 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1436 } 1437 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1438 1439 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1440 { 1441 struct net *net; 1442 /* Examine the link attributes and figure out which 1443 * network namespace we are talking about. 1444 */ 1445 if (tb[IFLA_NET_NS_PID]) 1446 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1447 else if (tb[IFLA_NET_NS_FD]) 1448 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1449 else 1450 net = get_net(src_net); 1451 return net; 1452 } 1453 EXPORT_SYMBOL(rtnl_link_get_net); 1454 1455 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1456 { 1457 if (dev) { 1458 if (tb[IFLA_ADDRESS] && 1459 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1460 return -EINVAL; 1461 1462 if (tb[IFLA_BROADCAST] && 1463 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1464 return -EINVAL; 1465 } 1466 1467 if (tb[IFLA_AF_SPEC]) { 1468 struct nlattr *af; 1469 int rem, err; 1470 1471 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1472 const struct rtnl_af_ops *af_ops; 1473 1474 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1475 return -EAFNOSUPPORT; 1476 1477 if (!af_ops->set_link_af) 1478 return -EOPNOTSUPP; 1479 1480 if (af_ops->validate_link_af) { 1481 err = af_ops->validate_link_af(dev, af); 1482 if (err < 0) 1483 return err; 1484 } 1485 } 1486 } 1487 1488 return 0; 1489 } 1490 1491 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 1492 { 1493 const struct net_device_ops *ops = dev->netdev_ops; 1494 int err = -EINVAL; 1495 1496 if (tb[IFLA_VF_MAC]) { 1497 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 1498 1499 err = -EOPNOTSUPP; 1500 if (ops->ndo_set_vf_mac) 1501 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1502 ivm->mac); 1503 if (err < 0) 1504 return err; 1505 } 1506 1507 if (tb[IFLA_VF_VLAN]) { 1508 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 1509 1510 err = -EOPNOTSUPP; 1511 if (ops->ndo_set_vf_vlan) 1512 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 1513 ivv->qos); 1514 if (err < 0) 1515 return err; 1516 } 1517 1518 if (tb[IFLA_VF_TX_RATE]) { 1519 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1520 struct ifla_vf_info ivf; 1521 1522 err = -EOPNOTSUPP; 1523 if (ops->ndo_get_vf_config) 1524 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 1525 if (err < 0) 1526 return err; 1527 1528 err = -EOPNOTSUPP; 1529 if (ops->ndo_set_vf_rate) 1530 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1531 ivf.min_tx_rate, 1532 ivt->rate); 1533 if (err < 0) 1534 return err; 1535 } 1536 1537 if (tb[IFLA_VF_RATE]) { 1538 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 1539 1540 err = -EOPNOTSUPP; 1541 if (ops->ndo_set_vf_rate) 1542 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1543 ivt->min_tx_rate, 1544 ivt->max_tx_rate); 1545 if (err < 0) 1546 return err; 1547 } 1548 1549 if (tb[IFLA_VF_SPOOFCHK]) { 1550 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 1551 1552 err = -EOPNOTSUPP; 1553 if (ops->ndo_set_vf_spoofchk) 1554 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1555 ivs->setting); 1556 if (err < 0) 1557 return err; 1558 } 1559 1560 if (tb[IFLA_VF_LINK_STATE]) { 1561 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 1562 1563 err = -EOPNOTSUPP; 1564 if (ops->ndo_set_vf_link_state) 1565 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1566 ivl->link_state); 1567 if (err < 0) 1568 return err; 1569 } 1570 1571 if (tb[IFLA_VF_RSS_QUERY_EN]) { 1572 struct ifla_vf_rss_query_en *ivrssq_en; 1573 1574 err = -EOPNOTSUPP; 1575 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 1576 if (ops->ndo_set_vf_rss_query_en) 1577 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 1578 ivrssq_en->setting); 1579 if (err < 0) 1580 return err; 1581 } 1582 1583 return err; 1584 } 1585 1586 static int do_set_master(struct net_device *dev, int ifindex) 1587 { 1588 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1589 const struct net_device_ops *ops; 1590 int err; 1591 1592 if (upper_dev) { 1593 if (upper_dev->ifindex == ifindex) 1594 return 0; 1595 ops = upper_dev->netdev_ops; 1596 if (ops->ndo_del_slave) { 1597 err = ops->ndo_del_slave(upper_dev, dev); 1598 if (err) 1599 return err; 1600 } else { 1601 return -EOPNOTSUPP; 1602 } 1603 } 1604 1605 if (ifindex) { 1606 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1607 if (!upper_dev) 1608 return -EINVAL; 1609 ops = upper_dev->netdev_ops; 1610 if (ops->ndo_add_slave) { 1611 err = ops->ndo_add_slave(upper_dev, dev); 1612 if (err) 1613 return err; 1614 } else { 1615 return -EOPNOTSUPP; 1616 } 1617 } 1618 return 0; 1619 } 1620 1621 #define DO_SETLINK_MODIFIED 0x01 1622 /* notify flag means notify + modified. */ 1623 #define DO_SETLINK_NOTIFY 0x03 1624 static int do_setlink(const struct sk_buff *skb, 1625 struct net_device *dev, struct ifinfomsg *ifm, 1626 struct nlattr **tb, char *ifname, int status) 1627 { 1628 const struct net_device_ops *ops = dev->netdev_ops; 1629 int err; 1630 1631 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1632 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1633 if (IS_ERR(net)) { 1634 err = PTR_ERR(net); 1635 goto errout; 1636 } 1637 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1638 put_net(net); 1639 err = -EPERM; 1640 goto errout; 1641 } 1642 err = dev_change_net_namespace(dev, net, ifname); 1643 put_net(net); 1644 if (err) 1645 goto errout; 1646 status |= DO_SETLINK_MODIFIED; 1647 } 1648 1649 if (tb[IFLA_MAP]) { 1650 struct rtnl_link_ifmap *u_map; 1651 struct ifmap k_map; 1652 1653 if (!ops->ndo_set_config) { 1654 err = -EOPNOTSUPP; 1655 goto errout; 1656 } 1657 1658 if (!netif_device_present(dev)) { 1659 err = -ENODEV; 1660 goto errout; 1661 } 1662 1663 u_map = nla_data(tb[IFLA_MAP]); 1664 k_map.mem_start = (unsigned long) u_map->mem_start; 1665 k_map.mem_end = (unsigned long) u_map->mem_end; 1666 k_map.base_addr = (unsigned short) u_map->base_addr; 1667 k_map.irq = (unsigned char) u_map->irq; 1668 k_map.dma = (unsigned char) u_map->dma; 1669 k_map.port = (unsigned char) u_map->port; 1670 1671 err = ops->ndo_set_config(dev, &k_map); 1672 if (err < 0) 1673 goto errout; 1674 1675 status |= DO_SETLINK_NOTIFY; 1676 } 1677 1678 if (tb[IFLA_ADDRESS]) { 1679 struct sockaddr *sa; 1680 int len; 1681 1682 len = sizeof(sa_family_t) + dev->addr_len; 1683 sa = kmalloc(len, GFP_KERNEL); 1684 if (!sa) { 1685 err = -ENOMEM; 1686 goto errout; 1687 } 1688 sa->sa_family = dev->type; 1689 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1690 dev->addr_len); 1691 err = dev_set_mac_address(dev, sa); 1692 kfree(sa); 1693 if (err) 1694 goto errout; 1695 status |= DO_SETLINK_MODIFIED; 1696 } 1697 1698 if (tb[IFLA_MTU]) { 1699 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1700 if (err < 0) 1701 goto errout; 1702 status |= DO_SETLINK_MODIFIED; 1703 } 1704 1705 if (tb[IFLA_GROUP]) { 1706 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1707 status |= DO_SETLINK_NOTIFY; 1708 } 1709 1710 /* 1711 * Interface selected by interface index but interface 1712 * name provided implies that a name change has been 1713 * requested. 1714 */ 1715 if (ifm->ifi_index > 0 && ifname[0]) { 1716 err = dev_change_name(dev, ifname); 1717 if (err < 0) 1718 goto errout; 1719 status |= DO_SETLINK_MODIFIED; 1720 } 1721 1722 if (tb[IFLA_IFALIAS]) { 1723 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1724 nla_len(tb[IFLA_IFALIAS])); 1725 if (err < 0) 1726 goto errout; 1727 status |= DO_SETLINK_NOTIFY; 1728 } 1729 1730 if (tb[IFLA_BROADCAST]) { 1731 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1732 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1733 } 1734 1735 if (ifm->ifi_flags || ifm->ifi_change) { 1736 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1737 if (err < 0) 1738 goto errout; 1739 } 1740 1741 if (tb[IFLA_MASTER]) { 1742 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1743 if (err) 1744 goto errout; 1745 status |= DO_SETLINK_MODIFIED; 1746 } 1747 1748 if (tb[IFLA_CARRIER]) { 1749 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1750 if (err) 1751 goto errout; 1752 status |= DO_SETLINK_MODIFIED; 1753 } 1754 1755 if (tb[IFLA_TXQLEN]) { 1756 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1757 1758 if (dev->tx_queue_len ^ value) 1759 status |= DO_SETLINK_NOTIFY; 1760 1761 dev->tx_queue_len = value; 1762 } 1763 1764 if (tb[IFLA_OPERSTATE]) 1765 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1766 1767 if (tb[IFLA_LINKMODE]) { 1768 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1769 1770 write_lock_bh(&dev_base_lock); 1771 if (dev->link_mode ^ value) 1772 status |= DO_SETLINK_NOTIFY; 1773 dev->link_mode = value; 1774 write_unlock_bh(&dev_base_lock); 1775 } 1776 1777 if (tb[IFLA_VFINFO_LIST]) { 1778 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 1779 struct nlattr *attr; 1780 int rem; 1781 1782 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1783 if (nla_type(attr) != IFLA_VF_INFO || 1784 nla_len(attr) < NLA_HDRLEN) { 1785 err = -EINVAL; 1786 goto errout; 1787 } 1788 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 1789 ifla_vf_policy); 1790 if (err < 0) 1791 goto errout; 1792 err = do_setvfinfo(dev, vfinfo); 1793 if (err < 0) 1794 goto errout; 1795 status |= DO_SETLINK_NOTIFY; 1796 } 1797 } 1798 err = 0; 1799 1800 if (tb[IFLA_VF_PORTS]) { 1801 struct nlattr *port[IFLA_PORT_MAX+1]; 1802 struct nlattr *attr; 1803 int vf; 1804 int rem; 1805 1806 err = -EOPNOTSUPP; 1807 if (!ops->ndo_set_vf_port) 1808 goto errout; 1809 1810 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1811 if (nla_type(attr) != IFLA_VF_PORT || 1812 nla_len(attr) < NLA_HDRLEN) { 1813 err = -EINVAL; 1814 goto errout; 1815 } 1816 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 1817 ifla_port_policy); 1818 if (err < 0) 1819 goto errout; 1820 if (!port[IFLA_PORT_VF]) { 1821 err = -EOPNOTSUPP; 1822 goto errout; 1823 } 1824 vf = nla_get_u32(port[IFLA_PORT_VF]); 1825 err = ops->ndo_set_vf_port(dev, vf, port); 1826 if (err < 0) 1827 goto errout; 1828 status |= DO_SETLINK_NOTIFY; 1829 } 1830 } 1831 err = 0; 1832 1833 if (tb[IFLA_PORT_SELF]) { 1834 struct nlattr *port[IFLA_PORT_MAX+1]; 1835 1836 err = nla_parse_nested(port, IFLA_PORT_MAX, 1837 tb[IFLA_PORT_SELF], ifla_port_policy); 1838 if (err < 0) 1839 goto errout; 1840 1841 err = -EOPNOTSUPP; 1842 if (ops->ndo_set_vf_port) 1843 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1844 if (err < 0) 1845 goto errout; 1846 status |= DO_SETLINK_NOTIFY; 1847 } 1848 1849 if (tb[IFLA_AF_SPEC]) { 1850 struct nlattr *af; 1851 int rem; 1852 1853 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1854 const struct rtnl_af_ops *af_ops; 1855 1856 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1857 BUG(); 1858 1859 err = af_ops->set_link_af(dev, af); 1860 if (err < 0) 1861 goto errout; 1862 1863 status |= DO_SETLINK_NOTIFY; 1864 } 1865 } 1866 err = 0; 1867 1868 if (tb[IFLA_PROTO_DOWN]) { 1869 err = dev_change_proto_down(dev, 1870 nla_get_u8(tb[IFLA_PROTO_DOWN])); 1871 if (err) 1872 goto errout; 1873 status |= DO_SETLINK_NOTIFY; 1874 } 1875 1876 errout: 1877 if (status & DO_SETLINK_MODIFIED) { 1878 if (status & DO_SETLINK_NOTIFY) 1879 netdev_state_change(dev); 1880 1881 if (err < 0) 1882 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", 1883 dev->name); 1884 } 1885 1886 return err; 1887 } 1888 1889 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1890 { 1891 struct net *net = sock_net(skb->sk); 1892 struct ifinfomsg *ifm; 1893 struct net_device *dev; 1894 int err; 1895 struct nlattr *tb[IFLA_MAX+1]; 1896 char ifname[IFNAMSIZ]; 1897 1898 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1899 if (err < 0) 1900 goto errout; 1901 1902 if (tb[IFLA_IFNAME]) 1903 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1904 else 1905 ifname[0] = '\0'; 1906 1907 err = -EINVAL; 1908 ifm = nlmsg_data(nlh); 1909 if (ifm->ifi_index > 0) 1910 dev = __dev_get_by_index(net, ifm->ifi_index); 1911 else if (tb[IFLA_IFNAME]) 1912 dev = __dev_get_by_name(net, ifname); 1913 else 1914 goto errout; 1915 1916 if (dev == NULL) { 1917 err = -ENODEV; 1918 goto errout; 1919 } 1920 1921 err = validate_linkmsg(dev, tb); 1922 if (err < 0) 1923 goto errout; 1924 1925 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 1926 errout: 1927 return err; 1928 } 1929 1930 static int rtnl_group_dellink(const struct net *net, int group) 1931 { 1932 struct net_device *dev, *aux; 1933 LIST_HEAD(list_kill); 1934 bool found = false; 1935 1936 if (!group) 1937 return -EPERM; 1938 1939 for_each_netdev(net, dev) { 1940 if (dev->group == group) { 1941 const struct rtnl_link_ops *ops; 1942 1943 found = true; 1944 ops = dev->rtnl_link_ops; 1945 if (!ops || !ops->dellink) 1946 return -EOPNOTSUPP; 1947 } 1948 } 1949 1950 if (!found) 1951 return -ENODEV; 1952 1953 for_each_netdev_safe(net, dev, aux) { 1954 if (dev->group == group) { 1955 const struct rtnl_link_ops *ops; 1956 1957 ops = dev->rtnl_link_ops; 1958 ops->dellink(dev, &list_kill); 1959 } 1960 } 1961 unregister_netdevice_many(&list_kill); 1962 1963 return 0; 1964 } 1965 1966 int rtnl_delete_link(struct net_device *dev) 1967 { 1968 const struct rtnl_link_ops *ops; 1969 LIST_HEAD(list_kill); 1970 1971 ops = dev->rtnl_link_ops; 1972 if (!ops || !ops->dellink) 1973 return -EOPNOTSUPP; 1974 1975 ops->dellink(dev, &list_kill); 1976 unregister_netdevice_many(&list_kill); 1977 1978 return 0; 1979 } 1980 EXPORT_SYMBOL_GPL(rtnl_delete_link); 1981 1982 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1983 { 1984 struct net *net = sock_net(skb->sk); 1985 struct net_device *dev; 1986 struct ifinfomsg *ifm; 1987 char ifname[IFNAMSIZ]; 1988 struct nlattr *tb[IFLA_MAX+1]; 1989 int err; 1990 1991 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1992 if (err < 0) 1993 return err; 1994 1995 if (tb[IFLA_IFNAME]) 1996 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1997 1998 ifm = nlmsg_data(nlh); 1999 if (ifm->ifi_index > 0) 2000 dev = __dev_get_by_index(net, ifm->ifi_index); 2001 else if (tb[IFLA_IFNAME]) 2002 dev = __dev_get_by_name(net, ifname); 2003 else if (tb[IFLA_GROUP]) 2004 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 2005 else 2006 return -EINVAL; 2007 2008 if (!dev) 2009 return -ENODEV; 2010 2011 return rtnl_delete_link(dev); 2012 } 2013 2014 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 2015 { 2016 unsigned int old_flags; 2017 int err; 2018 2019 old_flags = dev->flags; 2020 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2021 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2022 if (err < 0) 2023 return err; 2024 } 2025 2026 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2027 2028 __dev_notify_flags(dev, old_flags, ~0U); 2029 return 0; 2030 } 2031 EXPORT_SYMBOL(rtnl_configure_link); 2032 2033 struct net_device *rtnl_create_link(struct net *net, 2034 const char *ifname, unsigned char name_assign_type, 2035 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2036 { 2037 int err; 2038 struct net_device *dev; 2039 unsigned int num_tx_queues = 1; 2040 unsigned int num_rx_queues = 1; 2041 2042 if (tb[IFLA_NUM_TX_QUEUES]) 2043 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2044 else if (ops->get_num_tx_queues) 2045 num_tx_queues = ops->get_num_tx_queues(); 2046 2047 if (tb[IFLA_NUM_RX_QUEUES]) 2048 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2049 else if (ops->get_num_rx_queues) 2050 num_rx_queues = ops->get_num_rx_queues(); 2051 2052 err = -ENOMEM; 2053 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2054 ops->setup, num_tx_queues, num_rx_queues); 2055 if (!dev) 2056 goto err; 2057 2058 dev_net_set(dev, net); 2059 dev->rtnl_link_ops = ops; 2060 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2061 2062 if (tb[IFLA_MTU]) 2063 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2064 if (tb[IFLA_ADDRESS]) { 2065 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2066 nla_len(tb[IFLA_ADDRESS])); 2067 dev->addr_assign_type = NET_ADDR_SET; 2068 } 2069 if (tb[IFLA_BROADCAST]) 2070 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2071 nla_len(tb[IFLA_BROADCAST])); 2072 if (tb[IFLA_TXQLEN]) 2073 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2074 if (tb[IFLA_OPERSTATE]) 2075 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2076 if (tb[IFLA_LINKMODE]) 2077 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2078 if (tb[IFLA_GROUP]) 2079 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2080 2081 return dev; 2082 2083 err: 2084 return ERR_PTR(err); 2085 } 2086 EXPORT_SYMBOL(rtnl_create_link); 2087 2088 static int rtnl_group_changelink(const struct sk_buff *skb, 2089 struct net *net, int group, 2090 struct ifinfomsg *ifm, 2091 struct nlattr **tb) 2092 { 2093 struct net_device *dev, *aux; 2094 int err; 2095 2096 for_each_netdev_safe(net, dev, aux) { 2097 if (dev->group == group) { 2098 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2099 if (err < 0) 2100 return err; 2101 } 2102 } 2103 2104 return 0; 2105 } 2106 2107 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2108 { 2109 struct net *net = sock_net(skb->sk); 2110 const struct rtnl_link_ops *ops; 2111 const struct rtnl_link_ops *m_ops = NULL; 2112 struct net_device *dev; 2113 struct net_device *master_dev = NULL; 2114 struct ifinfomsg *ifm; 2115 char kind[MODULE_NAME_LEN]; 2116 char ifname[IFNAMSIZ]; 2117 struct nlattr *tb[IFLA_MAX+1]; 2118 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2119 unsigned char name_assign_type = NET_NAME_USER; 2120 int err; 2121 2122 #ifdef CONFIG_MODULES 2123 replay: 2124 #endif 2125 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2126 if (err < 0) 2127 return err; 2128 2129 if (tb[IFLA_IFNAME]) 2130 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2131 else 2132 ifname[0] = '\0'; 2133 2134 ifm = nlmsg_data(nlh); 2135 if (ifm->ifi_index > 0) 2136 dev = __dev_get_by_index(net, ifm->ifi_index); 2137 else { 2138 if (ifname[0]) 2139 dev = __dev_get_by_name(net, ifname); 2140 else 2141 dev = NULL; 2142 } 2143 2144 if (dev) { 2145 master_dev = netdev_master_upper_dev_get(dev); 2146 if (master_dev) 2147 m_ops = master_dev->rtnl_link_ops; 2148 } 2149 2150 err = validate_linkmsg(dev, tb); 2151 if (err < 0) 2152 return err; 2153 2154 if (tb[IFLA_LINKINFO]) { 2155 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2156 tb[IFLA_LINKINFO], ifla_info_policy); 2157 if (err < 0) 2158 return err; 2159 } else 2160 memset(linkinfo, 0, sizeof(linkinfo)); 2161 2162 if (linkinfo[IFLA_INFO_KIND]) { 2163 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2164 ops = rtnl_link_ops_get(kind); 2165 } else { 2166 kind[0] = '\0'; 2167 ops = NULL; 2168 } 2169 2170 if (1) { 2171 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2172 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2173 struct nlattr **data = NULL; 2174 struct nlattr **slave_data = NULL; 2175 struct net *dest_net, *link_net = NULL; 2176 2177 if (ops) { 2178 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2179 err = nla_parse_nested(attr, ops->maxtype, 2180 linkinfo[IFLA_INFO_DATA], 2181 ops->policy); 2182 if (err < 0) 2183 return err; 2184 data = attr; 2185 } 2186 if (ops->validate) { 2187 err = ops->validate(tb, data); 2188 if (err < 0) 2189 return err; 2190 } 2191 } 2192 2193 if (m_ops) { 2194 if (m_ops->slave_maxtype && 2195 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2196 err = nla_parse_nested(slave_attr, 2197 m_ops->slave_maxtype, 2198 linkinfo[IFLA_INFO_SLAVE_DATA], 2199 m_ops->slave_policy); 2200 if (err < 0) 2201 return err; 2202 slave_data = slave_attr; 2203 } 2204 if (m_ops->slave_validate) { 2205 err = m_ops->slave_validate(tb, slave_data); 2206 if (err < 0) 2207 return err; 2208 } 2209 } 2210 2211 if (dev) { 2212 int status = 0; 2213 2214 if (nlh->nlmsg_flags & NLM_F_EXCL) 2215 return -EEXIST; 2216 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2217 return -EOPNOTSUPP; 2218 2219 if (linkinfo[IFLA_INFO_DATA]) { 2220 if (!ops || ops != dev->rtnl_link_ops || 2221 !ops->changelink) 2222 return -EOPNOTSUPP; 2223 2224 err = ops->changelink(dev, tb, data); 2225 if (err < 0) 2226 return err; 2227 status |= DO_SETLINK_NOTIFY; 2228 } 2229 2230 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2231 if (!m_ops || !m_ops->slave_changelink) 2232 return -EOPNOTSUPP; 2233 2234 err = m_ops->slave_changelink(master_dev, dev, 2235 tb, slave_data); 2236 if (err < 0) 2237 return err; 2238 status |= DO_SETLINK_NOTIFY; 2239 } 2240 2241 return do_setlink(skb, dev, ifm, tb, ifname, status); 2242 } 2243 2244 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2245 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2246 return rtnl_group_changelink(skb, net, 2247 nla_get_u32(tb[IFLA_GROUP]), 2248 ifm, tb); 2249 return -ENODEV; 2250 } 2251 2252 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2253 return -EOPNOTSUPP; 2254 2255 if (!ops) { 2256 #ifdef CONFIG_MODULES 2257 if (kind[0]) { 2258 __rtnl_unlock(); 2259 request_module("rtnl-link-%s", kind); 2260 rtnl_lock(); 2261 ops = rtnl_link_ops_get(kind); 2262 if (ops) 2263 goto replay; 2264 } 2265 #endif 2266 return -EOPNOTSUPP; 2267 } 2268 2269 if (!ops->setup) 2270 return -EOPNOTSUPP; 2271 2272 if (!ifname[0]) { 2273 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2274 name_assign_type = NET_NAME_ENUM; 2275 } 2276 2277 dest_net = rtnl_link_get_net(net, tb); 2278 if (IS_ERR(dest_net)) 2279 return PTR_ERR(dest_net); 2280 2281 err = -EPERM; 2282 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2283 goto out; 2284 2285 if (tb[IFLA_LINK_NETNSID]) { 2286 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2287 2288 link_net = get_net_ns_by_id(dest_net, id); 2289 if (!link_net) { 2290 err = -EINVAL; 2291 goto out; 2292 } 2293 err = -EPERM; 2294 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2295 goto out; 2296 } 2297 2298 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2299 name_assign_type, ops, tb); 2300 if (IS_ERR(dev)) { 2301 err = PTR_ERR(dev); 2302 goto out; 2303 } 2304 2305 dev->ifindex = ifm->ifi_index; 2306 2307 if (ops->newlink) { 2308 err = ops->newlink(link_net ? : net, dev, tb, data); 2309 /* Drivers should call free_netdev() in ->destructor 2310 * and unregister it on failure after registration 2311 * so that device could be finally freed in rtnl_unlock. 2312 */ 2313 if (err < 0) { 2314 /* If device is not registered at all, free it now */ 2315 if (dev->reg_state == NETREG_UNINITIALIZED) 2316 free_netdev(dev); 2317 goto out; 2318 } 2319 } else { 2320 err = register_netdevice(dev); 2321 if (err < 0) { 2322 free_netdev(dev); 2323 goto out; 2324 } 2325 } 2326 err = rtnl_configure_link(dev, ifm); 2327 if (err < 0) 2328 goto out_unregister; 2329 if (link_net) { 2330 err = dev_change_net_namespace(dev, dest_net, ifname); 2331 if (err < 0) 2332 goto out_unregister; 2333 } 2334 out: 2335 if (link_net) 2336 put_net(link_net); 2337 put_net(dest_net); 2338 return err; 2339 out_unregister: 2340 if (ops->newlink) { 2341 LIST_HEAD(list_kill); 2342 2343 ops->dellink(dev, &list_kill); 2344 unregister_netdevice_many(&list_kill); 2345 } else { 2346 unregister_netdevice(dev); 2347 } 2348 goto out; 2349 } 2350 } 2351 2352 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2353 { 2354 struct net *net = sock_net(skb->sk); 2355 struct ifinfomsg *ifm; 2356 char ifname[IFNAMSIZ]; 2357 struct nlattr *tb[IFLA_MAX+1]; 2358 struct net_device *dev = NULL; 2359 struct sk_buff *nskb; 2360 int err; 2361 u32 ext_filter_mask = 0; 2362 2363 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2364 if (err < 0) 2365 return err; 2366 2367 if (tb[IFLA_IFNAME]) 2368 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2369 2370 if (tb[IFLA_EXT_MASK]) 2371 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2372 2373 ifm = nlmsg_data(nlh); 2374 if (ifm->ifi_index > 0) 2375 dev = __dev_get_by_index(net, ifm->ifi_index); 2376 else if (tb[IFLA_IFNAME]) 2377 dev = __dev_get_by_name(net, ifname); 2378 else 2379 return -EINVAL; 2380 2381 if (dev == NULL) 2382 return -ENODEV; 2383 2384 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2385 if (nskb == NULL) 2386 return -ENOBUFS; 2387 2388 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2389 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2390 if (err < 0) { 2391 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2392 WARN_ON(err == -EMSGSIZE); 2393 kfree_skb(nskb); 2394 } else 2395 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2396 2397 return err; 2398 } 2399 2400 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2401 { 2402 struct net *net = sock_net(skb->sk); 2403 struct net_device *dev; 2404 struct nlattr *tb[IFLA_MAX+1]; 2405 u32 ext_filter_mask = 0; 2406 u16 min_ifinfo_dump_size = 0; 2407 int hdrlen; 2408 2409 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2410 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2411 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2412 2413 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2414 if (tb[IFLA_EXT_MASK]) 2415 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2416 } 2417 2418 if (!ext_filter_mask) 2419 return NLMSG_GOODSIZE; 2420 /* 2421 * traverse the list of net devices and compute the minimum 2422 * buffer size based upon the filter mask. 2423 */ 2424 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2425 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2426 if_nlmsg_size(dev, 2427 ext_filter_mask)); 2428 } 2429 2430 return min_ifinfo_dump_size; 2431 } 2432 2433 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2434 { 2435 int idx; 2436 int s_idx = cb->family; 2437 2438 if (s_idx == 0) 2439 s_idx = 1; 2440 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2441 int type = cb->nlh->nlmsg_type-RTM_BASE; 2442 if (idx < s_idx || idx == PF_PACKET) 2443 continue; 2444 if (rtnl_msg_handlers[idx] == NULL || 2445 rtnl_msg_handlers[idx][type].dumpit == NULL) 2446 continue; 2447 if (idx > s_idx) { 2448 memset(&cb->args[0], 0, sizeof(cb->args)); 2449 cb->prev_seq = 0; 2450 cb->seq = 0; 2451 } 2452 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2453 break; 2454 } 2455 cb->family = idx; 2456 2457 return skb->len; 2458 } 2459 2460 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2461 unsigned int change, gfp_t flags) 2462 { 2463 struct net *net = dev_net(dev); 2464 struct sk_buff *skb; 2465 int err = -ENOBUFS; 2466 size_t if_info_size; 2467 2468 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2469 if (skb == NULL) 2470 goto errout; 2471 2472 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2473 if (err < 0) { 2474 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2475 WARN_ON(err == -EMSGSIZE); 2476 kfree_skb(skb); 2477 goto errout; 2478 } 2479 return skb; 2480 errout: 2481 if (err < 0) 2482 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2483 return NULL; 2484 } 2485 2486 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2487 { 2488 struct net *net = dev_net(dev); 2489 2490 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2491 } 2492 2493 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2494 gfp_t flags) 2495 { 2496 struct sk_buff *skb; 2497 2498 if (dev->reg_state != NETREG_REGISTERED) 2499 return; 2500 2501 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2502 if (skb) 2503 rtmsg_ifinfo_send(skb, dev, flags); 2504 } 2505 EXPORT_SYMBOL(rtmsg_ifinfo); 2506 2507 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2508 struct net_device *dev, 2509 u8 *addr, u16 vid, u32 pid, u32 seq, 2510 int type, unsigned int flags, 2511 int nlflags) 2512 { 2513 struct nlmsghdr *nlh; 2514 struct ndmsg *ndm; 2515 2516 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2517 if (!nlh) 2518 return -EMSGSIZE; 2519 2520 ndm = nlmsg_data(nlh); 2521 ndm->ndm_family = AF_BRIDGE; 2522 ndm->ndm_pad1 = 0; 2523 ndm->ndm_pad2 = 0; 2524 ndm->ndm_flags = flags; 2525 ndm->ndm_type = 0; 2526 ndm->ndm_ifindex = dev->ifindex; 2527 ndm->ndm_state = NUD_PERMANENT; 2528 2529 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2530 goto nla_put_failure; 2531 if (vid) 2532 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2533 goto nla_put_failure; 2534 2535 nlmsg_end(skb, nlh); 2536 return 0; 2537 2538 nla_put_failure: 2539 nlmsg_cancel(skb, nlh); 2540 return -EMSGSIZE; 2541 } 2542 2543 static inline size_t rtnl_fdb_nlmsg_size(void) 2544 { 2545 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2546 } 2547 2548 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type) 2549 { 2550 struct net *net = dev_net(dev); 2551 struct sk_buff *skb; 2552 int err = -ENOBUFS; 2553 2554 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2555 if (!skb) 2556 goto errout; 2557 2558 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2559 0, 0, type, NTF_SELF, 0); 2560 if (err < 0) { 2561 kfree_skb(skb); 2562 goto errout; 2563 } 2564 2565 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2566 return; 2567 errout: 2568 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2569 } 2570 2571 /** 2572 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2573 */ 2574 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2575 struct nlattr *tb[], 2576 struct net_device *dev, 2577 const unsigned char *addr, u16 vid, 2578 u16 flags) 2579 { 2580 int err = -EINVAL; 2581 2582 /* If aging addresses are supported device will need to 2583 * implement its own handler for this. 2584 */ 2585 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2586 pr_info("%s: FDB only supports static addresses\n", dev->name); 2587 return err; 2588 } 2589 2590 if (vid) { 2591 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2592 return err; 2593 } 2594 2595 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2596 err = dev_uc_add_excl(dev, addr); 2597 else if (is_multicast_ether_addr(addr)) 2598 err = dev_mc_add_excl(dev, addr); 2599 2600 /* Only return duplicate errors if NLM_F_EXCL is set */ 2601 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2602 err = 0; 2603 2604 return err; 2605 } 2606 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2607 2608 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2609 { 2610 u16 vid = 0; 2611 2612 if (vlan_attr) { 2613 if (nla_len(vlan_attr) != sizeof(u16)) { 2614 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2615 return -EINVAL; 2616 } 2617 2618 vid = nla_get_u16(vlan_attr); 2619 2620 if (!vid || vid >= VLAN_VID_MASK) { 2621 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2622 vid); 2623 return -EINVAL; 2624 } 2625 } 2626 *p_vid = vid; 2627 return 0; 2628 } 2629 2630 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2631 { 2632 struct net *net = sock_net(skb->sk); 2633 struct ndmsg *ndm; 2634 struct nlattr *tb[NDA_MAX+1]; 2635 struct net_device *dev; 2636 u8 *addr; 2637 u16 vid; 2638 int err; 2639 2640 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2641 if (err < 0) 2642 return err; 2643 2644 ndm = nlmsg_data(nlh); 2645 if (ndm->ndm_ifindex == 0) { 2646 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2647 return -EINVAL; 2648 } 2649 2650 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2651 if (dev == NULL) { 2652 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2653 return -ENODEV; 2654 } 2655 2656 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2657 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2658 return -EINVAL; 2659 } 2660 2661 addr = nla_data(tb[NDA_LLADDR]); 2662 2663 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2664 if (err) 2665 return err; 2666 2667 err = -EOPNOTSUPP; 2668 2669 /* Support fdb on master device the net/bridge default case */ 2670 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2671 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2672 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2673 const struct net_device_ops *ops = br_dev->netdev_ops; 2674 2675 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2676 nlh->nlmsg_flags); 2677 if (err) 2678 goto out; 2679 else 2680 ndm->ndm_flags &= ~NTF_MASTER; 2681 } 2682 2683 /* Embedded bridge, macvlan, and any other device support */ 2684 if ((ndm->ndm_flags & NTF_SELF)) { 2685 if (dev->netdev_ops->ndo_fdb_add) 2686 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2687 vid, 2688 nlh->nlmsg_flags); 2689 else 2690 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 2691 nlh->nlmsg_flags); 2692 2693 if (!err) { 2694 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH); 2695 ndm->ndm_flags &= ~NTF_SELF; 2696 } 2697 } 2698 out: 2699 return err; 2700 } 2701 2702 /** 2703 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2704 */ 2705 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2706 struct nlattr *tb[], 2707 struct net_device *dev, 2708 const unsigned char *addr, u16 vid) 2709 { 2710 int err = -EINVAL; 2711 2712 /* If aging addresses are supported device will need to 2713 * implement its own handler for this. 2714 */ 2715 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2716 pr_info("%s: FDB only supports static addresses\n", dev->name); 2717 return err; 2718 } 2719 2720 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2721 err = dev_uc_del(dev, addr); 2722 else if (is_multicast_ether_addr(addr)) 2723 err = dev_mc_del(dev, addr); 2724 2725 return err; 2726 } 2727 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2728 2729 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2730 { 2731 struct net *net = sock_net(skb->sk); 2732 struct ndmsg *ndm; 2733 struct nlattr *tb[NDA_MAX+1]; 2734 struct net_device *dev; 2735 int err = -EINVAL; 2736 __u8 *addr; 2737 u16 vid; 2738 2739 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2740 return -EPERM; 2741 2742 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2743 if (err < 0) 2744 return err; 2745 2746 ndm = nlmsg_data(nlh); 2747 if (ndm->ndm_ifindex == 0) { 2748 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2749 return -EINVAL; 2750 } 2751 2752 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2753 if (dev == NULL) { 2754 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2755 return -ENODEV; 2756 } 2757 2758 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2759 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2760 return -EINVAL; 2761 } 2762 2763 addr = nla_data(tb[NDA_LLADDR]); 2764 2765 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2766 if (err) 2767 return err; 2768 2769 err = -EOPNOTSUPP; 2770 2771 /* Support fdb on master device the net/bridge default case */ 2772 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2773 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2774 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2775 const struct net_device_ops *ops = br_dev->netdev_ops; 2776 2777 if (ops->ndo_fdb_del) 2778 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 2779 2780 if (err) 2781 goto out; 2782 else 2783 ndm->ndm_flags &= ~NTF_MASTER; 2784 } 2785 2786 /* Embedded bridge, macvlan, and any other device support */ 2787 if (ndm->ndm_flags & NTF_SELF) { 2788 if (dev->netdev_ops->ndo_fdb_del) 2789 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 2790 vid); 2791 else 2792 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 2793 2794 if (!err) { 2795 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH); 2796 ndm->ndm_flags &= ~NTF_SELF; 2797 } 2798 } 2799 out: 2800 return err; 2801 } 2802 2803 static int nlmsg_populate_fdb(struct sk_buff *skb, 2804 struct netlink_callback *cb, 2805 struct net_device *dev, 2806 int *idx, 2807 struct netdev_hw_addr_list *list) 2808 { 2809 struct netdev_hw_addr *ha; 2810 int err; 2811 u32 portid, seq; 2812 2813 portid = NETLINK_CB(cb->skb).portid; 2814 seq = cb->nlh->nlmsg_seq; 2815 2816 list_for_each_entry(ha, &list->list, list) { 2817 if (*idx < cb->args[0]) 2818 goto skip; 2819 2820 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 2821 portid, seq, 2822 RTM_NEWNEIGH, NTF_SELF, 2823 NLM_F_MULTI); 2824 if (err < 0) 2825 return err; 2826 skip: 2827 *idx += 1; 2828 } 2829 return 0; 2830 } 2831 2832 /** 2833 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2834 * @nlh: netlink message header 2835 * @dev: netdevice 2836 * 2837 * Default netdevice operation to dump the existing unicast address list. 2838 * Returns number of addresses from list put in skb. 2839 */ 2840 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2841 struct netlink_callback *cb, 2842 struct net_device *dev, 2843 struct net_device *filter_dev, 2844 int idx) 2845 { 2846 int err; 2847 2848 netif_addr_lock_bh(dev); 2849 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2850 if (err) 2851 goto out; 2852 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2853 out: 2854 netif_addr_unlock_bh(dev); 2855 return idx; 2856 } 2857 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2858 2859 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2860 { 2861 struct net_device *dev; 2862 struct nlattr *tb[IFLA_MAX+1]; 2863 struct net_device *br_dev = NULL; 2864 const struct net_device_ops *ops = NULL; 2865 const struct net_device_ops *cops = NULL; 2866 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2867 struct net *net = sock_net(skb->sk); 2868 int brport_idx = 0; 2869 int br_idx = 0; 2870 int idx = 0; 2871 2872 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 2873 ifla_policy) == 0) { 2874 if (tb[IFLA_MASTER]) 2875 br_idx = nla_get_u32(tb[IFLA_MASTER]); 2876 } 2877 2878 brport_idx = ifm->ifi_index; 2879 2880 if (br_idx) { 2881 br_dev = __dev_get_by_index(net, br_idx); 2882 if (!br_dev) 2883 return -ENODEV; 2884 2885 ops = br_dev->netdev_ops; 2886 } 2887 2888 for_each_netdev(net, dev) { 2889 if (brport_idx && (dev->ifindex != brport_idx)) 2890 continue; 2891 2892 if (!br_idx) { /* user did not specify a specific bridge */ 2893 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2894 br_dev = netdev_master_upper_dev_get(dev); 2895 cops = br_dev->netdev_ops; 2896 } 2897 2898 } else { 2899 if (dev != br_dev && 2900 !(dev->priv_flags & IFF_BRIDGE_PORT)) 2901 continue; 2902 2903 if (br_dev != netdev_master_upper_dev_get(dev) && 2904 !(dev->priv_flags & IFF_EBRIDGE)) 2905 continue; 2906 2907 cops = ops; 2908 } 2909 2910 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2911 if (cops && cops->ndo_fdb_dump) 2912 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 2913 idx); 2914 } 2915 2916 if (dev->netdev_ops->ndo_fdb_dump) 2917 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL, 2918 idx); 2919 else 2920 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 2921 2922 cops = NULL; 2923 } 2924 2925 cb->args[0] = idx; 2926 return skb->len; 2927 } 2928 2929 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 2930 unsigned int attrnum, unsigned int flag) 2931 { 2932 if (mask & flag) 2933 return nla_put_u8(skb, attrnum, !!(flags & flag)); 2934 return 0; 2935 } 2936 2937 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2938 struct net_device *dev, u16 mode, 2939 u32 flags, u32 mask, int nlflags, 2940 u32 filter_mask, 2941 int (*vlan_fill)(struct sk_buff *skb, 2942 struct net_device *dev, 2943 u32 filter_mask)) 2944 { 2945 struct nlmsghdr *nlh; 2946 struct ifinfomsg *ifm; 2947 struct nlattr *br_afspec; 2948 struct nlattr *protinfo; 2949 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2950 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2951 int err = 0; 2952 2953 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 2954 if (nlh == NULL) 2955 return -EMSGSIZE; 2956 2957 ifm = nlmsg_data(nlh); 2958 ifm->ifi_family = AF_BRIDGE; 2959 ifm->__ifi_pad = 0; 2960 ifm->ifi_type = dev->type; 2961 ifm->ifi_index = dev->ifindex; 2962 ifm->ifi_flags = dev_get_flags(dev); 2963 ifm->ifi_change = 0; 2964 2965 2966 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2967 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2968 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2969 (br_dev && 2970 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2971 (dev->addr_len && 2972 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2973 (dev->ifindex != dev_get_iflink(dev) && 2974 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 2975 goto nla_put_failure; 2976 2977 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2978 if (!br_afspec) 2979 goto nla_put_failure; 2980 2981 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 2982 nla_nest_cancel(skb, br_afspec); 2983 goto nla_put_failure; 2984 } 2985 2986 if (mode != BRIDGE_MODE_UNDEF) { 2987 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2988 nla_nest_cancel(skb, br_afspec); 2989 goto nla_put_failure; 2990 } 2991 } 2992 if (vlan_fill) { 2993 err = vlan_fill(skb, dev, filter_mask); 2994 if (err) { 2995 nla_nest_cancel(skb, br_afspec); 2996 goto nla_put_failure; 2997 } 2998 } 2999 nla_nest_end(skb, br_afspec); 3000 3001 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 3002 if (!protinfo) 3003 goto nla_put_failure; 3004 3005 if (brport_nla_put_flag(skb, flags, mask, 3006 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 3007 brport_nla_put_flag(skb, flags, mask, 3008 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 3009 brport_nla_put_flag(skb, flags, mask, 3010 IFLA_BRPORT_FAST_LEAVE, 3011 BR_MULTICAST_FAST_LEAVE) || 3012 brport_nla_put_flag(skb, flags, mask, 3013 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 3014 brport_nla_put_flag(skb, flags, mask, 3015 IFLA_BRPORT_LEARNING, BR_LEARNING) || 3016 brport_nla_put_flag(skb, flags, mask, 3017 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 3018 brport_nla_put_flag(skb, flags, mask, 3019 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3020 brport_nla_put_flag(skb, flags, mask, 3021 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3022 nla_nest_cancel(skb, protinfo); 3023 goto nla_put_failure; 3024 } 3025 3026 nla_nest_end(skb, protinfo); 3027 3028 nlmsg_end(skb, nlh); 3029 return 0; 3030 nla_put_failure: 3031 nlmsg_cancel(skb, nlh); 3032 return err ? err : -EMSGSIZE; 3033 } 3034 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3035 3036 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3037 { 3038 struct net *net = sock_net(skb->sk); 3039 struct net_device *dev; 3040 int idx = 0; 3041 u32 portid = NETLINK_CB(cb->skb).portid; 3042 u32 seq = cb->nlh->nlmsg_seq; 3043 u32 filter_mask = 0; 3044 3045 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3046 struct nlattr *extfilt; 3047 3048 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3049 IFLA_EXT_MASK); 3050 if (extfilt) { 3051 if (nla_len(extfilt) < sizeof(filter_mask)) 3052 return -EINVAL; 3053 3054 filter_mask = nla_get_u32(extfilt); 3055 } 3056 } 3057 3058 rcu_read_lock(); 3059 for_each_netdev_rcu(net, dev) { 3060 const struct net_device_ops *ops = dev->netdev_ops; 3061 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3062 3063 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3064 if (idx >= cb->args[0] && 3065 br_dev->netdev_ops->ndo_bridge_getlink( 3066 skb, portid, seq, dev, filter_mask, 3067 NLM_F_MULTI) < 0) 3068 break; 3069 idx++; 3070 } 3071 3072 if (ops->ndo_bridge_getlink) { 3073 if (idx >= cb->args[0] && 3074 ops->ndo_bridge_getlink(skb, portid, seq, dev, 3075 filter_mask, 3076 NLM_F_MULTI) < 0) 3077 break; 3078 idx++; 3079 } 3080 } 3081 rcu_read_unlock(); 3082 cb->args[0] = idx; 3083 3084 return skb->len; 3085 } 3086 3087 static inline size_t bridge_nlmsg_size(void) 3088 { 3089 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3090 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3091 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3092 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3093 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3094 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3095 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3096 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3097 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3098 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3099 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3100 } 3101 3102 static int rtnl_bridge_notify(struct net_device *dev) 3103 { 3104 struct net *net = dev_net(dev); 3105 struct sk_buff *skb; 3106 int err = -EOPNOTSUPP; 3107 3108 if (!dev->netdev_ops->ndo_bridge_getlink) 3109 return 0; 3110 3111 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3112 if (!skb) { 3113 err = -ENOMEM; 3114 goto errout; 3115 } 3116 3117 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3118 if (err < 0) 3119 goto errout; 3120 3121 if (!skb->len) 3122 goto errout; 3123 3124 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3125 return 0; 3126 errout: 3127 WARN_ON(err == -EMSGSIZE); 3128 kfree_skb(skb); 3129 if (err) 3130 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3131 return err; 3132 } 3133 3134 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3135 { 3136 struct net *net = sock_net(skb->sk); 3137 struct ifinfomsg *ifm; 3138 struct net_device *dev; 3139 struct nlattr *br_spec, *attr = NULL; 3140 int rem, err = -EOPNOTSUPP; 3141 u16 flags = 0; 3142 bool have_flags = false; 3143 3144 if (nlmsg_len(nlh) < sizeof(*ifm)) 3145 return -EINVAL; 3146 3147 ifm = nlmsg_data(nlh); 3148 if (ifm->ifi_family != AF_BRIDGE) 3149 return -EPFNOSUPPORT; 3150 3151 dev = __dev_get_by_index(net, ifm->ifi_index); 3152 if (!dev) { 3153 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3154 return -ENODEV; 3155 } 3156 3157 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3158 if (br_spec) { 3159 nla_for_each_nested(attr, br_spec, rem) { 3160 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3161 if (nla_len(attr) < sizeof(flags)) 3162 return -EINVAL; 3163 3164 have_flags = true; 3165 flags = nla_get_u16(attr); 3166 break; 3167 } 3168 } 3169 } 3170 3171 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3172 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3173 3174 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3175 err = -EOPNOTSUPP; 3176 goto out; 3177 } 3178 3179 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3180 if (err) 3181 goto out; 3182 3183 flags &= ~BRIDGE_FLAGS_MASTER; 3184 } 3185 3186 if ((flags & BRIDGE_FLAGS_SELF)) { 3187 if (!dev->netdev_ops->ndo_bridge_setlink) 3188 err = -EOPNOTSUPP; 3189 else 3190 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3191 flags); 3192 if (!err) { 3193 flags &= ~BRIDGE_FLAGS_SELF; 3194 3195 /* Generate event to notify upper layer of bridge 3196 * change 3197 */ 3198 err = rtnl_bridge_notify(dev); 3199 } 3200 } 3201 3202 if (have_flags) 3203 memcpy(nla_data(attr), &flags, sizeof(flags)); 3204 out: 3205 return err; 3206 } 3207 3208 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3209 { 3210 struct net *net = sock_net(skb->sk); 3211 struct ifinfomsg *ifm; 3212 struct net_device *dev; 3213 struct nlattr *br_spec, *attr = NULL; 3214 int rem, err = -EOPNOTSUPP; 3215 u16 flags = 0; 3216 bool have_flags = false; 3217 3218 if (nlmsg_len(nlh) < sizeof(*ifm)) 3219 return -EINVAL; 3220 3221 ifm = nlmsg_data(nlh); 3222 if (ifm->ifi_family != AF_BRIDGE) 3223 return -EPFNOSUPPORT; 3224 3225 dev = __dev_get_by_index(net, ifm->ifi_index); 3226 if (!dev) { 3227 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3228 return -ENODEV; 3229 } 3230 3231 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3232 if (br_spec) { 3233 nla_for_each_nested(attr, br_spec, rem) { 3234 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3235 if (nla_len(attr) < sizeof(flags)) 3236 return -EINVAL; 3237 3238 have_flags = true; 3239 flags = nla_get_u16(attr); 3240 break; 3241 } 3242 } 3243 } 3244 3245 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3246 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3247 3248 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3249 err = -EOPNOTSUPP; 3250 goto out; 3251 } 3252 3253 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3254 if (err) 3255 goto out; 3256 3257 flags &= ~BRIDGE_FLAGS_MASTER; 3258 } 3259 3260 if ((flags & BRIDGE_FLAGS_SELF)) { 3261 if (!dev->netdev_ops->ndo_bridge_dellink) 3262 err = -EOPNOTSUPP; 3263 else 3264 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3265 flags); 3266 3267 if (!err) { 3268 flags &= ~BRIDGE_FLAGS_SELF; 3269 3270 /* Generate event to notify upper layer of bridge 3271 * change 3272 */ 3273 err = rtnl_bridge_notify(dev); 3274 } 3275 } 3276 3277 if (have_flags) 3278 memcpy(nla_data(attr), &flags, sizeof(flags)); 3279 out: 3280 return err; 3281 } 3282 3283 /* Process one rtnetlink message. */ 3284 3285 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3286 { 3287 struct net *net = sock_net(skb->sk); 3288 rtnl_doit_func doit; 3289 int sz_idx, kind; 3290 int family; 3291 int type; 3292 int err; 3293 3294 type = nlh->nlmsg_type; 3295 if (type > RTM_MAX) 3296 return -EOPNOTSUPP; 3297 3298 type -= RTM_BASE; 3299 3300 /* All the messages must have at least 1 byte length */ 3301 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3302 return 0; 3303 3304 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3305 sz_idx = type>>2; 3306 kind = type&3; 3307 3308 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3309 return -EPERM; 3310 3311 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 3312 struct sock *rtnl; 3313 rtnl_dumpit_func dumpit; 3314 rtnl_calcit_func calcit; 3315 u16 min_dump_alloc = 0; 3316 3317 dumpit = rtnl_get_dumpit(family, type); 3318 if (dumpit == NULL) 3319 return -EOPNOTSUPP; 3320 calcit = rtnl_get_calcit(family, type); 3321 if (calcit) 3322 min_dump_alloc = calcit(skb, nlh); 3323 3324 __rtnl_unlock(); 3325 rtnl = net->rtnl; 3326 { 3327 struct netlink_dump_control c = { 3328 .dump = dumpit, 3329 .min_dump_alloc = min_dump_alloc, 3330 }; 3331 err = netlink_dump_start(rtnl, skb, nlh, &c); 3332 } 3333 rtnl_lock(); 3334 return err; 3335 } 3336 3337 doit = rtnl_get_doit(family, type); 3338 if (doit == NULL) 3339 return -EOPNOTSUPP; 3340 3341 return doit(skb, nlh); 3342 } 3343 3344 static void rtnetlink_rcv(struct sk_buff *skb) 3345 { 3346 rtnl_lock(); 3347 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 3348 rtnl_unlock(); 3349 } 3350 3351 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 3352 { 3353 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3354 3355 switch (event) { 3356 case NETDEV_UP: 3357 case NETDEV_DOWN: 3358 case NETDEV_PRE_UP: 3359 case NETDEV_POST_INIT: 3360 case NETDEV_REGISTER: 3361 case NETDEV_CHANGE: 3362 case NETDEV_PRE_TYPE_CHANGE: 3363 case NETDEV_GOING_DOWN: 3364 case NETDEV_UNREGISTER: 3365 case NETDEV_UNREGISTER_FINAL: 3366 case NETDEV_RELEASE: 3367 case NETDEV_JOIN: 3368 case NETDEV_BONDING_INFO: 3369 break; 3370 default: 3371 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3372 break; 3373 } 3374 return NOTIFY_DONE; 3375 } 3376 3377 static struct notifier_block rtnetlink_dev_notifier = { 3378 .notifier_call = rtnetlink_event, 3379 }; 3380 3381 3382 static int __net_init rtnetlink_net_init(struct net *net) 3383 { 3384 struct sock *sk; 3385 struct netlink_kernel_cfg cfg = { 3386 .groups = RTNLGRP_MAX, 3387 .input = rtnetlink_rcv, 3388 .cb_mutex = &rtnl_mutex, 3389 .flags = NL_CFG_F_NONROOT_RECV, 3390 }; 3391 3392 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3393 if (!sk) 3394 return -ENOMEM; 3395 net->rtnl = sk; 3396 return 0; 3397 } 3398 3399 static void __net_exit rtnetlink_net_exit(struct net *net) 3400 { 3401 netlink_kernel_release(net->rtnl); 3402 net->rtnl = NULL; 3403 } 3404 3405 static struct pernet_operations rtnetlink_net_ops = { 3406 .init = rtnetlink_net_init, 3407 .exit = rtnetlink_net_exit, 3408 }; 3409 3410 void __init rtnetlink_init(void) 3411 { 3412 if (register_pernet_subsys(&rtnetlink_net_ops)) 3413 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3414 3415 register_netdevice_notifier(&rtnetlink_dev_notifier); 3416 3417 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3418 rtnl_dump_ifinfo, rtnl_calcit); 3419 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3420 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3421 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3422 3423 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3424 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3425 3426 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3427 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3428 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3429 3430 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3431 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3432 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3433 } 3434 3435