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 return size; 823 } else 824 return 0; 825 } 826 827 static size_t rtnl_port_size(const struct net_device *dev, 828 u32 ext_filter_mask) 829 { 830 size_t port_size = nla_total_size(4) /* PORT_VF */ 831 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 832 + nla_total_size(sizeof(struct ifla_port_vsi)) 833 /* PORT_VSI_TYPE */ 834 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 835 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 836 + nla_total_size(1) /* PROT_VDP_REQUEST */ 837 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 838 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 839 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 840 + port_size; 841 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 842 + port_size; 843 844 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 845 !(ext_filter_mask & RTEXT_FILTER_VF)) 846 return 0; 847 if (dev_num_vf(dev->dev.parent)) 848 return port_self_size + vf_ports_size + 849 vf_port_size * dev_num_vf(dev->dev.parent); 850 else 851 return port_self_size; 852 } 853 854 static noinline size_t if_nlmsg_size(const struct net_device *dev, 855 u32 ext_filter_mask) 856 { 857 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 858 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 859 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 860 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 861 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 862 + nla_total_size(sizeof(struct rtnl_link_stats)) 863 + nla_total_size(sizeof(struct rtnl_link_stats64)) 864 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 865 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 866 + nla_total_size(4) /* IFLA_TXQLEN */ 867 + nla_total_size(4) /* IFLA_WEIGHT */ 868 + nla_total_size(4) /* IFLA_MTU */ 869 + nla_total_size(4) /* IFLA_LINK */ 870 + nla_total_size(4) /* IFLA_MASTER */ 871 + nla_total_size(1) /* IFLA_CARRIER */ 872 + nla_total_size(4) /* IFLA_PROMISCUITY */ 873 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 874 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 875 + nla_total_size(1) /* IFLA_OPERSTATE */ 876 + nla_total_size(1) /* IFLA_LINKMODE */ 877 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 878 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 879 + nla_total_size(ext_filter_mask 880 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 881 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 882 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 883 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 884 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */ 885 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 886 + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_SWITCH_ID */ 887 } 888 889 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 890 { 891 struct nlattr *vf_ports; 892 struct nlattr *vf_port; 893 int vf; 894 int err; 895 896 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 897 if (!vf_ports) 898 return -EMSGSIZE; 899 900 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 901 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 902 if (!vf_port) 903 goto nla_put_failure; 904 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 905 goto nla_put_failure; 906 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 907 if (err == -EMSGSIZE) 908 goto nla_put_failure; 909 if (err) { 910 nla_nest_cancel(skb, vf_port); 911 continue; 912 } 913 nla_nest_end(skb, vf_port); 914 } 915 916 nla_nest_end(skb, vf_ports); 917 918 return 0; 919 920 nla_put_failure: 921 nla_nest_cancel(skb, vf_ports); 922 return -EMSGSIZE; 923 } 924 925 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 926 { 927 struct nlattr *port_self; 928 int err; 929 930 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 931 if (!port_self) 932 return -EMSGSIZE; 933 934 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 935 if (err) { 936 nla_nest_cancel(skb, port_self); 937 return (err == -EMSGSIZE) ? err : 0; 938 } 939 940 nla_nest_end(skb, port_self); 941 942 return 0; 943 } 944 945 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 946 u32 ext_filter_mask) 947 { 948 int err; 949 950 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 951 !(ext_filter_mask & RTEXT_FILTER_VF)) 952 return 0; 953 954 err = rtnl_port_self_fill(skb, dev); 955 if (err) 956 return err; 957 958 if (dev_num_vf(dev->dev.parent)) { 959 err = rtnl_vf_ports_fill(skb, dev); 960 if (err) 961 return err; 962 } 963 964 return 0; 965 } 966 967 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 968 { 969 int err; 970 struct netdev_phys_item_id ppid; 971 972 err = dev_get_phys_port_id(dev, &ppid); 973 if (err) { 974 if (err == -EOPNOTSUPP) 975 return 0; 976 return err; 977 } 978 979 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 980 return -EMSGSIZE; 981 982 return 0; 983 } 984 985 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 986 { 987 char name[IFNAMSIZ]; 988 int err; 989 990 err = dev_get_phys_port_name(dev, name, sizeof(name)); 991 if (err) { 992 if (err == -EOPNOTSUPP) 993 return 0; 994 return err; 995 } 996 997 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 998 return -EMSGSIZE; 999 1000 return 0; 1001 } 1002 1003 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1004 { 1005 int err; 1006 struct netdev_phys_item_id psid; 1007 1008 err = netdev_switch_parent_id_get(dev, &psid); 1009 if (err) { 1010 if (err == -EOPNOTSUPP) 1011 return 0; 1012 return err; 1013 } 1014 1015 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, psid.id_len, psid.id)) 1016 return -EMSGSIZE; 1017 1018 return 0; 1019 } 1020 1021 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1022 int type, u32 pid, u32 seq, u32 change, 1023 unsigned int flags, u32 ext_filter_mask) 1024 { 1025 struct ifinfomsg *ifm; 1026 struct nlmsghdr *nlh; 1027 struct rtnl_link_stats64 temp; 1028 const struct rtnl_link_stats64 *stats; 1029 struct nlattr *attr, *af_spec; 1030 struct rtnl_af_ops *af_ops; 1031 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1032 1033 ASSERT_RTNL(); 1034 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1035 if (nlh == NULL) 1036 return -EMSGSIZE; 1037 1038 ifm = nlmsg_data(nlh); 1039 ifm->ifi_family = AF_UNSPEC; 1040 ifm->__ifi_pad = 0; 1041 ifm->ifi_type = dev->type; 1042 ifm->ifi_index = dev->ifindex; 1043 ifm->ifi_flags = dev_get_flags(dev); 1044 ifm->ifi_change = change; 1045 1046 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1047 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1048 nla_put_u8(skb, IFLA_OPERSTATE, 1049 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1050 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1051 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1052 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1053 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1054 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1055 #ifdef CONFIG_RPS 1056 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1057 #endif 1058 (dev->ifindex != dev->iflink && 1059 nla_put_u32(skb, IFLA_LINK, dev->iflink)) || 1060 (upper_dev && 1061 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1062 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1063 (dev->qdisc && 1064 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1065 (dev->ifalias && 1066 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1067 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1068 atomic_read(&dev->carrier_changes))) 1069 goto nla_put_failure; 1070 1071 if (1) { 1072 struct rtnl_link_ifmap map = { 1073 .mem_start = dev->mem_start, 1074 .mem_end = dev->mem_end, 1075 .base_addr = dev->base_addr, 1076 .irq = dev->irq, 1077 .dma = dev->dma, 1078 .port = dev->if_port, 1079 }; 1080 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1081 goto nla_put_failure; 1082 } 1083 1084 if (dev->addr_len) { 1085 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1086 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1087 goto nla_put_failure; 1088 } 1089 1090 if (rtnl_phys_port_id_fill(skb, dev)) 1091 goto nla_put_failure; 1092 1093 if (rtnl_phys_port_name_fill(skb, dev)) 1094 goto nla_put_failure; 1095 1096 if (rtnl_phys_switch_id_fill(skb, dev)) 1097 goto nla_put_failure; 1098 1099 attr = nla_reserve(skb, IFLA_STATS, 1100 sizeof(struct rtnl_link_stats)); 1101 if (attr == NULL) 1102 goto nla_put_failure; 1103 1104 stats = dev_get_stats(dev, &temp); 1105 copy_rtnl_link_stats(nla_data(attr), stats); 1106 1107 attr = nla_reserve(skb, IFLA_STATS64, 1108 sizeof(struct rtnl_link_stats64)); 1109 if (attr == NULL) 1110 goto nla_put_failure; 1111 copy_rtnl_link_stats64(nla_data(attr), stats); 1112 1113 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1114 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1115 goto nla_put_failure; 1116 1117 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 1118 && (ext_filter_mask & RTEXT_FILTER_VF)) { 1119 int i; 1120 1121 struct nlattr *vfinfo, *vf; 1122 int num_vfs = dev_num_vf(dev->dev.parent); 1123 1124 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1125 if (!vfinfo) 1126 goto nla_put_failure; 1127 for (i = 0; i < num_vfs; i++) { 1128 struct ifla_vf_info ivi; 1129 struct ifla_vf_mac vf_mac; 1130 struct ifla_vf_vlan vf_vlan; 1131 struct ifla_vf_rate vf_rate; 1132 struct ifla_vf_tx_rate vf_tx_rate; 1133 struct ifla_vf_spoofchk vf_spoofchk; 1134 struct ifla_vf_link_state vf_linkstate; 1135 1136 /* 1137 * Not all SR-IOV capable drivers support the 1138 * spoofcheck query. Preset to -1 so the user 1139 * space tool can detect that the driver didn't 1140 * report anything. 1141 */ 1142 ivi.spoofchk = -1; 1143 memset(ivi.mac, 0, sizeof(ivi.mac)); 1144 /* The default value for VF link state is "auto" 1145 * IFLA_VF_LINK_STATE_AUTO which equals zero 1146 */ 1147 ivi.linkstate = 0; 1148 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 1149 break; 1150 vf_mac.vf = 1151 vf_vlan.vf = 1152 vf_rate.vf = 1153 vf_tx_rate.vf = 1154 vf_spoofchk.vf = 1155 vf_linkstate.vf = ivi.vf; 1156 1157 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1158 vf_vlan.vlan = ivi.vlan; 1159 vf_vlan.qos = ivi.qos; 1160 vf_tx_rate.rate = ivi.max_tx_rate; 1161 vf_rate.min_tx_rate = ivi.min_tx_rate; 1162 vf_rate.max_tx_rate = ivi.max_tx_rate; 1163 vf_spoofchk.setting = ivi.spoofchk; 1164 vf_linkstate.link_state = ivi.linkstate; 1165 vf = nla_nest_start(skb, IFLA_VF_INFO); 1166 if (!vf) { 1167 nla_nest_cancel(skb, vfinfo); 1168 goto nla_put_failure; 1169 } 1170 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1171 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1172 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1173 &vf_rate) || 1174 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1175 &vf_tx_rate) || 1176 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1177 &vf_spoofchk) || 1178 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1179 &vf_linkstate)) 1180 goto nla_put_failure; 1181 nla_nest_end(skb, vf); 1182 } 1183 nla_nest_end(skb, vfinfo); 1184 } 1185 1186 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1187 goto nla_put_failure; 1188 1189 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1190 if (rtnl_link_fill(skb, dev) < 0) 1191 goto nla_put_failure; 1192 } 1193 1194 if (dev->rtnl_link_ops && 1195 dev->rtnl_link_ops->get_link_net) { 1196 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1197 1198 if (!net_eq(dev_net(dev), link_net)) { 1199 int id = peernet2id(dev_net(dev), link_net); 1200 1201 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1202 goto nla_put_failure; 1203 } 1204 } 1205 1206 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1207 goto nla_put_failure; 1208 1209 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1210 if (af_ops->fill_link_af) { 1211 struct nlattr *af; 1212 int err; 1213 1214 if (!(af = nla_nest_start(skb, af_ops->family))) 1215 goto nla_put_failure; 1216 1217 err = af_ops->fill_link_af(skb, dev); 1218 1219 /* 1220 * Caller may return ENODATA to indicate that there 1221 * was no data to be dumped. This is not an error, it 1222 * means we should trim the attribute header and 1223 * continue. 1224 */ 1225 if (err == -ENODATA) 1226 nla_nest_cancel(skb, af); 1227 else if (err < 0) 1228 goto nla_put_failure; 1229 1230 nla_nest_end(skb, af); 1231 } 1232 } 1233 1234 nla_nest_end(skb, af_spec); 1235 1236 nlmsg_end(skb, nlh); 1237 return 0; 1238 1239 nla_put_failure: 1240 nlmsg_cancel(skb, nlh); 1241 return -EMSGSIZE; 1242 } 1243 1244 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1245 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1246 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1247 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1248 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1249 [IFLA_MTU] = { .type = NLA_U32 }, 1250 [IFLA_LINK] = { .type = NLA_U32 }, 1251 [IFLA_MASTER] = { .type = NLA_U32 }, 1252 [IFLA_CARRIER] = { .type = NLA_U8 }, 1253 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1254 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1255 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1256 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1257 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1258 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1259 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1260 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1261 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1262 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1263 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1264 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1265 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1266 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1267 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1268 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1269 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1270 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1271 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1272 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1273 }; 1274 1275 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1276 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1277 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1278 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1279 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1280 }; 1281 1282 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1283 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1284 }; 1285 1286 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1287 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1288 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1289 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1290 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1291 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1292 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1293 }; 1294 1295 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1296 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1297 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1298 .len = PORT_PROFILE_MAX }, 1299 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1300 .len = sizeof(struct ifla_port_vsi)}, 1301 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1302 .len = PORT_UUID_MAX }, 1303 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1304 .len = PORT_UUID_MAX }, 1305 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1306 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1307 }; 1308 1309 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1310 { 1311 struct net *net = sock_net(skb->sk); 1312 int h, s_h; 1313 int idx = 0, s_idx; 1314 struct net_device *dev; 1315 struct hlist_head *head; 1316 struct nlattr *tb[IFLA_MAX+1]; 1317 u32 ext_filter_mask = 0; 1318 int err; 1319 int hdrlen; 1320 1321 s_h = cb->args[0]; 1322 s_idx = cb->args[1]; 1323 1324 cb->seq = net->dev_base_seq; 1325 1326 /* A hack to preserve kernel<->userspace interface. 1327 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1328 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1329 * what iproute2 < v3.9.0 used. 1330 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1331 * attribute, its netlink message is shorter than struct ifinfomsg. 1332 */ 1333 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1334 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1335 1336 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1337 1338 if (tb[IFLA_EXT_MASK]) 1339 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1340 } 1341 1342 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1343 idx = 0; 1344 head = &net->dev_index_head[h]; 1345 hlist_for_each_entry(dev, head, index_hlist) { 1346 if (idx < s_idx) 1347 goto cont; 1348 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1349 NETLINK_CB(cb->skb).portid, 1350 cb->nlh->nlmsg_seq, 0, 1351 NLM_F_MULTI, 1352 ext_filter_mask); 1353 /* If we ran out of room on the first message, 1354 * we're in trouble 1355 */ 1356 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1357 1358 if (err < 0) 1359 goto out; 1360 1361 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1362 cont: 1363 idx++; 1364 } 1365 } 1366 out: 1367 cb->args[1] = idx; 1368 cb->args[0] = h; 1369 1370 return skb->len; 1371 } 1372 1373 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1374 { 1375 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1376 } 1377 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1378 1379 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1380 { 1381 struct net *net; 1382 /* Examine the link attributes and figure out which 1383 * network namespace we are talking about. 1384 */ 1385 if (tb[IFLA_NET_NS_PID]) 1386 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1387 else if (tb[IFLA_NET_NS_FD]) 1388 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1389 else 1390 net = get_net(src_net); 1391 return net; 1392 } 1393 EXPORT_SYMBOL(rtnl_link_get_net); 1394 1395 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1396 { 1397 if (dev) { 1398 if (tb[IFLA_ADDRESS] && 1399 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1400 return -EINVAL; 1401 1402 if (tb[IFLA_BROADCAST] && 1403 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1404 return -EINVAL; 1405 } 1406 1407 if (tb[IFLA_AF_SPEC]) { 1408 struct nlattr *af; 1409 int rem, err; 1410 1411 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1412 const struct rtnl_af_ops *af_ops; 1413 1414 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1415 return -EAFNOSUPPORT; 1416 1417 if (!af_ops->set_link_af) 1418 return -EOPNOTSUPP; 1419 1420 if (af_ops->validate_link_af) { 1421 err = af_ops->validate_link_af(dev, af); 1422 if (err < 0) 1423 return err; 1424 } 1425 } 1426 } 1427 1428 return 0; 1429 } 1430 1431 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1432 { 1433 int rem, err = -EINVAL; 1434 struct nlattr *vf; 1435 const struct net_device_ops *ops = dev->netdev_ops; 1436 1437 nla_for_each_nested(vf, attr, rem) { 1438 switch (nla_type(vf)) { 1439 case IFLA_VF_MAC: { 1440 struct ifla_vf_mac *ivm; 1441 ivm = nla_data(vf); 1442 err = -EOPNOTSUPP; 1443 if (ops->ndo_set_vf_mac) 1444 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1445 ivm->mac); 1446 break; 1447 } 1448 case IFLA_VF_VLAN: { 1449 struct ifla_vf_vlan *ivv; 1450 ivv = nla_data(vf); 1451 err = -EOPNOTSUPP; 1452 if (ops->ndo_set_vf_vlan) 1453 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1454 ivv->vlan, 1455 ivv->qos); 1456 break; 1457 } 1458 case IFLA_VF_TX_RATE: { 1459 struct ifla_vf_tx_rate *ivt; 1460 struct ifla_vf_info ivf; 1461 ivt = nla_data(vf); 1462 err = -EOPNOTSUPP; 1463 if (ops->ndo_get_vf_config) 1464 err = ops->ndo_get_vf_config(dev, ivt->vf, 1465 &ivf); 1466 if (err) 1467 break; 1468 err = -EOPNOTSUPP; 1469 if (ops->ndo_set_vf_rate) 1470 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1471 ivf.min_tx_rate, 1472 ivt->rate); 1473 break; 1474 } 1475 case IFLA_VF_RATE: { 1476 struct ifla_vf_rate *ivt; 1477 ivt = nla_data(vf); 1478 err = -EOPNOTSUPP; 1479 if (ops->ndo_set_vf_rate) 1480 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1481 ivt->min_tx_rate, 1482 ivt->max_tx_rate); 1483 break; 1484 } 1485 case IFLA_VF_SPOOFCHK: { 1486 struct ifla_vf_spoofchk *ivs; 1487 ivs = nla_data(vf); 1488 err = -EOPNOTSUPP; 1489 if (ops->ndo_set_vf_spoofchk) 1490 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1491 ivs->setting); 1492 break; 1493 } 1494 case IFLA_VF_LINK_STATE: { 1495 struct ifla_vf_link_state *ivl; 1496 ivl = nla_data(vf); 1497 err = -EOPNOTSUPP; 1498 if (ops->ndo_set_vf_link_state) 1499 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1500 ivl->link_state); 1501 break; 1502 } 1503 default: 1504 err = -EINVAL; 1505 break; 1506 } 1507 if (err) 1508 break; 1509 } 1510 return err; 1511 } 1512 1513 static int do_set_master(struct net_device *dev, int ifindex) 1514 { 1515 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1516 const struct net_device_ops *ops; 1517 int err; 1518 1519 if (upper_dev) { 1520 if (upper_dev->ifindex == ifindex) 1521 return 0; 1522 ops = upper_dev->netdev_ops; 1523 if (ops->ndo_del_slave) { 1524 err = ops->ndo_del_slave(upper_dev, dev); 1525 if (err) 1526 return err; 1527 } else { 1528 return -EOPNOTSUPP; 1529 } 1530 } 1531 1532 if (ifindex) { 1533 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1534 if (!upper_dev) 1535 return -EINVAL; 1536 ops = upper_dev->netdev_ops; 1537 if (ops->ndo_add_slave) { 1538 err = ops->ndo_add_slave(upper_dev, dev); 1539 if (err) 1540 return err; 1541 } else { 1542 return -EOPNOTSUPP; 1543 } 1544 } 1545 return 0; 1546 } 1547 1548 #define DO_SETLINK_MODIFIED 0x01 1549 /* notify flag means notify + modified. */ 1550 #define DO_SETLINK_NOTIFY 0x03 1551 static int do_setlink(const struct sk_buff *skb, 1552 struct net_device *dev, struct ifinfomsg *ifm, 1553 struct nlattr **tb, char *ifname, int status) 1554 { 1555 const struct net_device_ops *ops = dev->netdev_ops; 1556 int err; 1557 1558 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1559 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1560 if (IS_ERR(net)) { 1561 err = PTR_ERR(net); 1562 goto errout; 1563 } 1564 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1565 put_net(net); 1566 err = -EPERM; 1567 goto errout; 1568 } 1569 err = dev_change_net_namespace(dev, net, ifname); 1570 put_net(net); 1571 if (err) 1572 goto errout; 1573 status |= DO_SETLINK_MODIFIED; 1574 } 1575 1576 if (tb[IFLA_MAP]) { 1577 struct rtnl_link_ifmap *u_map; 1578 struct ifmap k_map; 1579 1580 if (!ops->ndo_set_config) { 1581 err = -EOPNOTSUPP; 1582 goto errout; 1583 } 1584 1585 if (!netif_device_present(dev)) { 1586 err = -ENODEV; 1587 goto errout; 1588 } 1589 1590 u_map = nla_data(tb[IFLA_MAP]); 1591 k_map.mem_start = (unsigned long) u_map->mem_start; 1592 k_map.mem_end = (unsigned long) u_map->mem_end; 1593 k_map.base_addr = (unsigned short) u_map->base_addr; 1594 k_map.irq = (unsigned char) u_map->irq; 1595 k_map.dma = (unsigned char) u_map->dma; 1596 k_map.port = (unsigned char) u_map->port; 1597 1598 err = ops->ndo_set_config(dev, &k_map); 1599 if (err < 0) 1600 goto errout; 1601 1602 status |= DO_SETLINK_NOTIFY; 1603 } 1604 1605 if (tb[IFLA_ADDRESS]) { 1606 struct sockaddr *sa; 1607 int len; 1608 1609 len = sizeof(sa_family_t) + dev->addr_len; 1610 sa = kmalloc(len, GFP_KERNEL); 1611 if (!sa) { 1612 err = -ENOMEM; 1613 goto errout; 1614 } 1615 sa->sa_family = dev->type; 1616 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1617 dev->addr_len); 1618 err = dev_set_mac_address(dev, sa); 1619 kfree(sa); 1620 if (err) 1621 goto errout; 1622 status |= DO_SETLINK_MODIFIED; 1623 } 1624 1625 if (tb[IFLA_MTU]) { 1626 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1627 if (err < 0) 1628 goto errout; 1629 status |= DO_SETLINK_MODIFIED; 1630 } 1631 1632 if (tb[IFLA_GROUP]) { 1633 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1634 status |= DO_SETLINK_NOTIFY; 1635 } 1636 1637 /* 1638 * Interface selected by interface index but interface 1639 * name provided implies that a name change has been 1640 * requested. 1641 */ 1642 if (ifm->ifi_index > 0 && ifname[0]) { 1643 err = dev_change_name(dev, ifname); 1644 if (err < 0) 1645 goto errout; 1646 status |= DO_SETLINK_MODIFIED; 1647 } 1648 1649 if (tb[IFLA_IFALIAS]) { 1650 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1651 nla_len(tb[IFLA_IFALIAS])); 1652 if (err < 0) 1653 goto errout; 1654 status |= DO_SETLINK_NOTIFY; 1655 } 1656 1657 if (tb[IFLA_BROADCAST]) { 1658 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1659 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1660 } 1661 1662 if (ifm->ifi_flags || ifm->ifi_change) { 1663 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1664 if (err < 0) 1665 goto errout; 1666 } 1667 1668 if (tb[IFLA_MASTER]) { 1669 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1670 if (err) 1671 goto errout; 1672 status |= DO_SETLINK_MODIFIED; 1673 } 1674 1675 if (tb[IFLA_CARRIER]) { 1676 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1677 if (err) 1678 goto errout; 1679 status |= DO_SETLINK_MODIFIED; 1680 } 1681 1682 if (tb[IFLA_TXQLEN]) { 1683 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1684 1685 if (dev->tx_queue_len ^ value) 1686 status |= DO_SETLINK_NOTIFY; 1687 1688 dev->tx_queue_len = value; 1689 } 1690 1691 if (tb[IFLA_OPERSTATE]) 1692 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1693 1694 if (tb[IFLA_LINKMODE]) { 1695 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1696 1697 write_lock_bh(&dev_base_lock); 1698 if (dev->link_mode ^ value) 1699 status |= DO_SETLINK_NOTIFY; 1700 dev->link_mode = value; 1701 write_unlock_bh(&dev_base_lock); 1702 } 1703 1704 if (tb[IFLA_VFINFO_LIST]) { 1705 struct nlattr *attr; 1706 int rem; 1707 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1708 if (nla_type(attr) != IFLA_VF_INFO) { 1709 err = -EINVAL; 1710 goto errout; 1711 } 1712 err = do_setvfinfo(dev, attr); 1713 if (err < 0) 1714 goto errout; 1715 status |= DO_SETLINK_NOTIFY; 1716 } 1717 } 1718 err = 0; 1719 1720 if (tb[IFLA_VF_PORTS]) { 1721 struct nlattr *port[IFLA_PORT_MAX+1]; 1722 struct nlattr *attr; 1723 int vf; 1724 int rem; 1725 1726 err = -EOPNOTSUPP; 1727 if (!ops->ndo_set_vf_port) 1728 goto errout; 1729 1730 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1731 if (nla_type(attr) != IFLA_VF_PORT) 1732 continue; 1733 err = nla_parse_nested(port, IFLA_PORT_MAX, 1734 attr, ifla_port_policy); 1735 if (err < 0) 1736 goto errout; 1737 if (!port[IFLA_PORT_VF]) { 1738 err = -EOPNOTSUPP; 1739 goto errout; 1740 } 1741 vf = nla_get_u32(port[IFLA_PORT_VF]); 1742 err = ops->ndo_set_vf_port(dev, vf, port); 1743 if (err < 0) 1744 goto errout; 1745 status |= DO_SETLINK_NOTIFY; 1746 } 1747 } 1748 err = 0; 1749 1750 if (tb[IFLA_PORT_SELF]) { 1751 struct nlattr *port[IFLA_PORT_MAX+1]; 1752 1753 err = nla_parse_nested(port, IFLA_PORT_MAX, 1754 tb[IFLA_PORT_SELF], ifla_port_policy); 1755 if (err < 0) 1756 goto errout; 1757 1758 err = -EOPNOTSUPP; 1759 if (ops->ndo_set_vf_port) 1760 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1761 if (err < 0) 1762 goto errout; 1763 status |= DO_SETLINK_NOTIFY; 1764 } 1765 1766 if (tb[IFLA_AF_SPEC]) { 1767 struct nlattr *af; 1768 int rem; 1769 1770 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1771 const struct rtnl_af_ops *af_ops; 1772 1773 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1774 BUG(); 1775 1776 err = af_ops->set_link_af(dev, af); 1777 if (err < 0) 1778 goto errout; 1779 1780 status |= DO_SETLINK_NOTIFY; 1781 } 1782 } 1783 err = 0; 1784 1785 errout: 1786 if (status & DO_SETLINK_MODIFIED) { 1787 if (status & DO_SETLINK_NOTIFY) 1788 netdev_state_change(dev); 1789 1790 if (err < 0) 1791 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", 1792 dev->name); 1793 } 1794 1795 return err; 1796 } 1797 1798 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1799 { 1800 struct net *net = sock_net(skb->sk); 1801 struct ifinfomsg *ifm; 1802 struct net_device *dev; 1803 int err; 1804 struct nlattr *tb[IFLA_MAX+1]; 1805 char ifname[IFNAMSIZ]; 1806 1807 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1808 if (err < 0) 1809 goto errout; 1810 1811 if (tb[IFLA_IFNAME]) 1812 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1813 else 1814 ifname[0] = '\0'; 1815 1816 err = -EINVAL; 1817 ifm = nlmsg_data(nlh); 1818 if (ifm->ifi_index > 0) 1819 dev = __dev_get_by_index(net, ifm->ifi_index); 1820 else if (tb[IFLA_IFNAME]) 1821 dev = __dev_get_by_name(net, ifname); 1822 else 1823 goto errout; 1824 1825 if (dev == NULL) { 1826 err = -ENODEV; 1827 goto errout; 1828 } 1829 1830 err = validate_linkmsg(dev, tb); 1831 if (err < 0) 1832 goto errout; 1833 1834 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 1835 errout: 1836 return err; 1837 } 1838 1839 static int rtnl_group_dellink(const struct net *net, int group) 1840 { 1841 struct net_device *dev, *aux; 1842 LIST_HEAD(list_kill); 1843 bool found = false; 1844 1845 if (!group) 1846 return -EPERM; 1847 1848 for_each_netdev(net, dev) { 1849 if (dev->group == group) { 1850 const struct rtnl_link_ops *ops; 1851 1852 found = true; 1853 ops = dev->rtnl_link_ops; 1854 if (!ops || !ops->dellink) 1855 return -EOPNOTSUPP; 1856 } 1857 } 1858 1859 if (!found) 1860 return -ENODEV; 1861 1862 for_each_netdev_safe(net, dev, aux) { 1863 if (dev->group == group) { 1864 const struct rtnl_link_ops *ops; 1865 1866 ops = dev->rtnl_link_ops; 1867 ops->dellink(dev, &list_kill); 1868 } 1869 } 1870 unregister_netdevice_many(&list_kill); 1871 1872 return 0; 1873 } 1874 1875 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1876 { 1877 struct net *net = sock_net(skb->sk); 1878 const struct rtnl_link_ops *ops; 1879 struct net_device *dev; 1880 struct ifinfomsg *ifm; 1881 char ifname[IFNAMSIZ]; 1882 struct nlattr *tb[IFLA_MAX+1]; 1883 int err; 1884 LIST_HEAD(list_kill); 1885 1886 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1887 if (err < 0) 1888 return err; 1889 1890 if (tb[IFLA_IFNAME]) 1891 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1892 1893 ifm = nlmsg_data(nlh); 1894 if (ifm->ifi_index > 0) 1895 dev = __dev_get_by_index(net, ifm->ifi_index); 1896 else if (tb[IFLA_IFNAME]) 1897 dev = __dev_get_by_name(net, ifname); 1898 else if (tb[IFLA_GROUP]) 1899 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 1900 else 1901 return -EINVAL; 1902 1903 if (!dev) 1904 return -ENODEV; 1905 1906 ops = dev->rtnl_link_ops; 1907 if (!ops || !ops->dellink) 1908 return -EOPNOTSUPP; 1909 1910 ops->dellink(dev, &list_kill); 1911 unregister_netdevice_many(&list_kill); 1912 return 0; 1913 } 1914 1915 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1916 { 1917 unsigned int old_flags; 1918 int err; 1919 1920 old_flags = dev->flags; 1921 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1922 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1923 if (err < 0) 1924 return err; 1925 } 1926 1927 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1928 1929 __dev_notify_flags(dev, old_flags, ~0U); 1930 return 0; 1931 } 1932 EXPORT_SYMBOL(rtnl_configure_link); 1933 1934 struct net_device *rtnl_create_link(struct net *net, 1935 char *ifname, unsigned char name_assign_type, 1936 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1937 { 1938 int err; 1939 struct net_device *dev; 1940 unsigned int num_tx_queues = 1; 1941 unsigned int num_rx_queues = 1; 1942 1943 if (tb[IFLA_NUM_TX_QUEUES]) 1944 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1945 else if (ops->get_num_tx_queues) 1946 num_tx_queues = ops->get_num_tx_queues(); 1947 1948 if (tb[IFLA_NUM_RX_QUEUES]) 1949 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1950 else if (ops->get_num_rx_queues) 1951 num_rx_queues = ops->get_num_rx_queues(); 1952 1953 err = -ENOMEM; 1954 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 1955 ops->setup, num_tx_queues, num_rx_queues); 1956 if (!dev) 1957 goto err; 1958 1959 dev_net_set(dev, net); 1960 dev->rtnl_link_ops = ops; 1961 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1962 1963 if (tb[IFLA_MTU]) 1964 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1965 if (tb[IFLA_ADDRESS]) { 1966 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1967 nla_len(tb[IFLA_ADDRESS])); 1968 dev->addr_assign_type = NET_ADDR_SET; 1969 } 1970 if (tb[IFLA_BROADCAST]) 1971 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1972 nla_len(tb[IFLA_BROADCAST])); 1973 if (tb[IFLA_TXQLEN]) 1974 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1975 if (tb[IFLA_OPERSTATE]) 1976 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1977 if (tb[IFLA_LINKMODE]) 1978 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1979 if (tb[IFLA_GROUP]) 1980 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1981 1982 return dev; 1983 1984 err: 1985 return ERR_PTR(err); 1986 } 1987 EXPORT_SYMBOL(rtnl_create_link); 1988 1989 static int rtnl_group_changelink(const struct sk_buff *skb, 1990 struct net *net, int group, 1991 struct ifinfomsg *ifm, 1992 struct nlattr **tb) 1993 { 1994 struct net_device *dev; 1995 int err; 1996 1997 for_each_netdev(net, dev) { 1998 if (dev->group == group) { 1999 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2000 if (err < 0) 2001 return err; 2002 } 2003 } 2004 2005 return 0; 2006 } 2007 2008 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2009 { 2010 struct net *net = sock_net(skb->sk); 2011 const struct rtnl_link_ops *ops; 2012 const struct rtnl_link_ops *m_ops = NULL; 2013 struct net_device *dev; 2014 struct net_device *master_dev = NULL; 2015 struct ifinfomsg *ifm; 2016 char kind[MODULE_NAME_LEN]; 2017 char ifname[IFNAMSIZ]; 2018 struct nlattr *tb[IFLA_MAX+1]; 2019 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2020 unsigned char name_assign_type = NET_NAME_USER; 2021 int err; 2022 2023 #ifdef CONFIG_MODULES 2024 replay: 2025 #endif 2026 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2027 if (err < 0) 2028 return err; 2029 2030 if (tb[IFLA_IFNAME]) 2031 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2032 else 2033 ifname[0] = '\0'; 2034 2035 ifm = nlmsg_data(nlh); 2036 if (ifm->ifi_index > 0) 2037 dev = __dev_get_by_index(net, ifm->ifi_index); 2038 else { 2039 if (ifname[0]) 2040 dev = __dev_get_by_name(net, ifname); 2041 else 2042 dev = NULL; 2043 } 2044 2045 if (dev) { 2046 master_dev = netdev_master_upper_dev_get(dev); 2047 if (master_dev) 2048 m_ops = master_dev->rtnl_link_ops; 2049 } 2050 2051 err = validate_linkmsg(dev, tb); 2052 if (err < 0) 2053 return err; 2054 2055 if (tb[IFLA_LINKINFO]) { 2056 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2057 tb[IFLA_LINKINFO], ifla_info_policy); 2058 if (err < 0) 2059 return err; 2060 } else 2061 memset(linkinfo, 0, sizeof(linkinfo)); 2062 2063 if (linkinfo[IFLA_INFO_KIND]) { 2064 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2065 ops = rtnl_link_ops_get(kind); 2066 } else { 2067 kind[0] = '\0'; 2068 ops = NULL; 2069 } 2070 2071 if (1) { 2072 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2073 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2074 struct nlattr **data = NULL; 2075 struct nlattr **slave_data = NULL; 2076 struct net *dest_net, *link_net = NULL; 2077 2078 if (ops) { 2079 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2080 err = nla_parse_nested(attr, ops->maxtype, 2081 linkinfo[IFLA_INFO_DATA], 2082 ops->policy); 2083 if (err < 0) 2084 return err; 2085 data = attr; 2086 } 2087 if (ops->validate) { 2088 err = ops->validate(tb, data); 2089 if (err < 0) 2090 return err; 2091 } 2092 } 2093 2094 if (m_ops) { 2095 if (m_ops->slave_maxtype && 2096 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2097 err = nla_parse_nested(slave_attr, 2098 m_ops->slave_maxtype, 2099 linkinfo[IFLA_INFO_SLAVE_DATA], 2100 m_ops->slave_policy); 2101 if (err < 0) 2102 return err; 2103 slave_data = slave_attr; 2104 } 2105 if (m_ops->slave_validate) { 2106 err = m_ops->slave_validate(tb, slave_data); 2107 if (err < 0) 2108 return err; 2109 } 2110 } 2111 2112 if (dev) { 2113 int status = 0; 2114 2115 if (nlh->nlmsg_flags & NLM_F_EXCL) 2116 return -EEXIST; 2117 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2118 return -EOPNOTSUPP; 2119 2120 if (linkinfo[IFLA_INFO_DATA]) { 2121 if (!ops || ops != dev->rtnl_link_ops || 2122 !ops->changelink) 2123 return -EOPNOTSUPP; 2124 2125 err = ops->changelink(dev, tb, data); 2126 if (err < 0) 2127 return err; 2128 status |= DO_SETLINK_NOTIFY; 2129 } 2130 2131 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2132 if (!m_ops || !m_ops->slave_changelink) 2133 return -EOPNOTSUPP; 2134 2135 err = m_ops->slave_changelink(master_dev, dev, 2136 tb, slave_data); 2137 if (err < 0) 2138 return err; 2139 status |= DO_SETLINK_NOTIFY; 2140 } 2141 2142 return do_setlink(skb, dev, ifm, tb, ifname, status); 2143 } 2144 2145 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2146 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2147 return rtnl_group_changelink(skb, net, 2148 nla_get_u32(tb[IFLA_GROUP]), 2149 ifm, tb); 2150 return -ENODEV; 2151 } 2152 2153 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2154 return -EOPNOTSUPP; 2155 2156 if (!ops) { 2157 #ifdef CONFIG_MODULES 2158 if (kind[0]) { 2159 __rtnl_unlock(); 2160 request_module("rtnl-link-%s", kind); 2161 rtnl_lock(); 2162 ops = rtnl_link_ops_get(kind); 2163 if (ops) 2164 goto replay; 2165 } 2166 #endif 2167 return -EOPNOTSUPP; 2168 } 2169 2170 if (!ops->setup) 2171 return -EOPNOTSUPP; 2172 2173 if (!ifname[0]) { 2174 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2175 name_assign_type = NET_NAME_ENUM; 2176 } 2177 2178 dest_net = rtnl_link_get_net(net, tb); 2179 if (IS_ERR(dest_net)) 2180 return PTR_ERR(dest_net); 2181 2182 err = -EPERM; 2183 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2184 goto out; 2185 2186 if (tb[IFLA_LINK_NETNSID]) { 2187 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2188 2189 link_net = get_net_ns_by_id(dest_net, id); 2190 if (!link_net) { 2191 err = -EINVAL; 2192 goto out; 2193 } 2194 err = -EPERM; 2195 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2196 goto out; 2197 } 2198 2199 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2200 name_assign_type, ops, tb); 2201 if (IS_ERR(dev)) { 2202 err = PTR_ERR(dev); 2203 goto out; 2204 } 2205 2206 dev->ifindex = ifm->ifi_index; 2207 2208 if (ops->newlink) { 2209 err = ops->newlink(link_net ? : net, dev, tb, data); 2210 /* Drivers should call free_netdev() in ->destructor 2211 * and unregister it on failure after registration 2212 * so that device could be finally freed in rtnl_unlock. 2213 */ 2214 if (err < 0) { 2215 /* If device is not registered at all, free it now */ 2216 if (dev->reg_state == NETREG_UNINITIALIZED) 2217 free_netdev(dev); 2218 goto out; 2219 } 2220 } else { 2221 err = register_netdevice(dev); 2222 if (err < 0) { 2223 free_netdev(dev); 2224 goto out; 2225 } 2226 } 2227 err = rtnl_configure_link(dev, ifm); 2228 if (err < 0) 2229 goto out_unregister; 2230 if (link_net) { 2231 err = dev_change_net_namespace(dev, dest_net, ifname); 2232 if (err < 0) 2233 goto out_unregister; 2234 } 2235 out: 2236 if (link_net) 2237 put_net(link_net); 2238 put_net(dest_net); 2239 return err; 2240 out_unregister: 2241 if (ops->newlink) { 2242 LIST_HEAD(list_kill); 2243 2244 ops->dellink(dev, &list_kill); 2245 unregister_netdevice_many(&list_kill); 2246 } else { 2247 unregister_netdevice(dev); 2248 } 2249 goto out; 2250 } 2251 } 2252 2253 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2254 { 2255 struct net *net = sock_net(skb->sk); 2256 struct ifinfomsg *ifm; 2257 char ifname[IFNAMSIZ]; 2258 struct nlattr *tb[IFLA_MAX+1]; 2259 struct net_device *dev = NULL; 2260 struct sk_buff *nskb; 2261 int err; 2262 u32 ext_filter_mask = 0; 2263 2264 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2265 if (err < 0) 2266 return err; 2267 2268 if (tb[IFLA_IFNAME]) 2269 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2270 2271 if (tb[IFLA_EXT_MASK]) 2272 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2273 2274 ifm = nlmsg_data(nlh); 2275 if (ifm->ifi_index > 0) 2276 dev = __dev_get_by_index(net, ifm->ifi_index); 2277 else if (tb[IFLA_IFNAME]) 2278 dev = __dev_get_by_name(net, ifname); 2279 else 2280 return -EINVAL; 2281 2282 if (dev == NULL) 2283 return -ENODEV; 2284 2285 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2286 if (nskb == NULL) 2287 return -ENOBUFS; 2288 2289 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2290 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2291 if (err < 0) { 2292 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2293 WARN_ON(err == -EMSGSIZE); 2294 kfree_skb(nskb); 2295 } else 2296 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2297 2298 return err; 2299 } 2300 2301 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2302 { 2303 struct net *net = sock_net(skb->sk); 2304 struct net_device *dev; 2305 struct nlattr *tb[IFLA_MAX+1]; 2306 u32 ext_filter_mask = 0; 2307 u16 min_ifinfo_dump_size = 0; 2308 int hdrlen; 2309 2310 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2311 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2312 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2313 2314 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2315 if (tb[IFLA_EXT_MASK]) 2316 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2317 } 2318 2319 if (!ext_filter_mask) 2320 return NLMSG_GOODSIZE; 2321 /* 2322 * traverse the list of net devices and compute the minimum 2323 * buffer size based upon the filter mask. 2324 */ 2325 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2326 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2327 if_nlmsg_size(dev, 2328 ext_filter_mask)); 2329 } 2330 2331 return min_ifinfo_dump_size; 2332 } 2333 2334 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2335 { 2336 int idx; 2337 int s_idx = cb->family; 2338 2339 if (s_idx == 0) 2340 s_idx = 1; 2341 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2342 int type = cb->nlh->nlmsg_type-RTM_BASE; 2343 if (idx < s_idx || idx == PF_PACKET) 2344 continue; 2345 if (rtnl_msg_handlers[idx] == NULL || 2346 rtnl_msg_handlers[idx][type].dumpit == NULL) 2347 continue; 2348 if (idx > s_idx) { 2349 memset(&cb->args[0], 0, sizeof(cb->args)); 2350 cb->prev_seq = 0; 2351 cb->seq = 0; 2352 } 2353 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2354 break; 2355 } 2356 cb->family = idx; 2357 2358 return skb->len; 2359 } 2360 2361 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2362 unsigned int change, gfp_t flags) 2363 { 2364 struct net *net = dev_net(dev); 2365 struct sk_buff *skb; 2366 int err = -ENOBUFS; 2367 size_t if_info_size; 2368 2369 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2370 if (skb == NULL) 2371 goto errout; 2372 2373 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2374 if (err < 0) { 2375 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2376 WARN_ON(err == -EMSGSIZE); 2377 kfree_skb(skb); 2378 goto errout; 2379 } 2380 return skb; 2381 errout: 2382 if (err < 0) 2383 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2384 return NULL; 2385 } 2386 2387 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2388 { 2389 struct net *net = dev_net(dev); 2390 2391 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2392 } 2393 2394 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2395 gfp_t flags) 2396 { 2397 struct sk_buff *skb; 2398 2399 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2400 if (skb) 2401 rtmsg_ifinfo_send(skb, dev, flags); 2402 } 2403 EXPORT_SYMBOL(rtmsg_ifinfo); 2404 2405 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2406 struct net_device *dev, 2407 u8 *addr, u32 pid, u32 seq, 2408 int type, unsigned int flags, 2409 int nlflags) 2410 { 2411 struct nlmsghdr *nlh; 2412 struct ndmsg *ndm; 2413 2414 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2415 if (!nlh) 2416 return -EMSGSIZE; 2417 2418 ndm = nlmsg_data(nlh); 2419 ndm->ndm_family = AF_BRIDGE; 2420 ndm->ndm_pad1 = 0; 2421 ndm->ndm_pad2 = 0; 2422 ndm->ndm_flags = flags; 2423 ndm->ndm_type = 0; 2424 ndm->ndm_ifindex = dev->ifindex; 2425 ndm->ndm_state = NUD_PERMANENT; 2426 2427 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2428 goto nla_put_failure; 2429 2430 nlmsg_end(skb, nlh); 2431 return 0; 2432 2433 nla_put_failure: 2434 nlmsg_cancel(skb, nlh); 2435 return -EMSGSIZE; 2436 } 2437 2438 static inline size_t rtnl_fdb_nlmsg_size(void) 2439 { 2440 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2441 } 2442 2443 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type) 2444 { 2445 struct net *net = dev_net(dev); 2446 struct sk_buff *skb; 2447 int err = -ENOBUFS; 2448 2449 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2450 if (!skb) 2451 goto errout; 2452 2453 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0); 2454 if (err < 0) { 2455 kfree_skb(skb); 2456 goto errout; 2457 } 2458 2459 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2460 return; 2461 errout: 2462 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2463 } 2464 2465 /** 2466 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2467 */ 2468 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2469 struct nlattr *tb[], 2470 struct net_device *dev, 2471 const unsigned char *addr, u16 vid, 2472 u16 flags) 2473 { 2474 int err = -EINVAL; 2475 2476 /* If aging addresses are supported device will need to 2477 * implement its own handler for this. 2478 */ 2479 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2480 pr_info("%s: FDB only supports static addresses\n", dev->name); 2481 return err; 2482 } 2483 2484 if (vid) { 2485 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2486 return err; 2487 } 2488 2489 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2490 err = dev_uc_add_excl(dev, addr); 2491 else if (is_multicast_ether_addr(addr)) 2492 err = dev_mc_add_excl(dev, addr); 2493 2494 /* Only return duplicate errors if NLM_F_EXCL is set */ 2495 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2496 err = 0; 2497 2498 return err; 2499 } 2500 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2501 2502 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2503 { 2504 u16 vid = 0; 2505 2506 if (vlan_attr) { 2507 if (nla_len(vlan_attr) != sizeof(u16)) { 2508 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2509 return -EINVAL; 2510 } 2511 2512 vid = nla_get_u16(vlan_attr); 2513 2514 if (!vid || vid >= VLAN_VID_MASK) { 2515 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2516 vid); 2517 return -EINVAL; 2518 } 2519 } 2520 *p_vid = vid; 2521 return 0; 2522 } 2523 2524 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2525 { 2526 struct net *net = sock_net(skb->sk); 2527 struct ndmsg *ndm; 2528 struct nlattr *tb[NDA_MAX+1]; 2529 struct net_device *dev; 2530 u8 *addr; 2531 u16 vid; 2532 int err; 2533 2534 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2535 if (err < 0) 2536 return err; 2537 2538 ndm = nlmsg_data(nlh); 2539 if (ndm->ndm_ifindex == 0) { 2540 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2541 return -EINVAL; 2542 } 2543 2544 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2545 if (dev == NULL) { 2546 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2547 return -ENODEV; 2548 } 2549 2550 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2551 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2552 return -EINVAL; 2553 } 2554 2555 addr = nla_data(tb[NDA_LLADDR]); 2556 2557 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2558 if (err) 2559 return err; 2560 2561 err = -EOPNOTSUPP; 2562 2563 /* Support fdb on master device the net/bridge default case */ 2564 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2565 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2566 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2567 const struct net_device_ops *ops = br_dev->netdev_ops; 2568 2569 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2570 nlh->nlmsg_flags); 2571 if (err) 2572 goto out; 2573 else 2574 ndm->ndm_flags &= ~NTF_MASTER; 2575 } 2576 2577 /* Embedded bridge, macvlan, and any other device support */ 2578 if ((ndm->ndm_flags & NTF_SELF)) { 2579 if (dev->netdev_ops->ndo_fdb_add) 2580 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2581 vid, 2582 nlh->nlmsg_flags); 2583 else 2584 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 2585 nlh->nlmsg_flags); 2586 2587 if (!err) { 2588 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH); 2589 ndm->ndm_flags &= ~NTF_SELF; 2590 } 2591 } 2592 out: 2593 return err; 2594 } 2595 2596 /** 2597 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2598 */ 2599 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2600 struct nlattr *tb[], 2601 struct net_device *dev, 2602 const unsigned char *addr, u16 vid) 2603 { 2604 int err = -EINVAL; 2605 2606 /* If aging addresses are supported device will need to 2607 * implement its own handler for this. 2608 */ 2609 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2610 pr_info("%s: FDB only supports static addresses\n", dev->name); 2611 return err; 2612 } 2613 2614 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2615 err = dev_uc_del(dev, addr); 2616 else if (is_multicast_ether_addr(addr)) 2617 err = dev_mc_del(dev, addr); 2618 2619 return err; 2620 } 2621 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2622 2623 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2624 { 2625 struct net *net = sock_net(skb->sk); 2626 struct ndmsg *ndm; 2627 struct nlattr *tb[NDA_MAX+1]; 2628 struct net_device *dev; 2629 int err = -EINVAL; 2630 __u8 *addr; 2631 u16 vid; 2632 2633 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2634 return -EPERM; 2635 2636 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2637 if (err < 0) 2638 return err; 2639 2640 ndm = nlmsg_data(nlh); 2641 if (ndm->ndm_ifindex == 0) { 2642 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2643 return -EINVAL; 2644 } 2645 2646 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2647 if (dev == NULL) { 2648 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2649 return -ENODEV; 2650 } 2651 2652 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2653 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2654 return -EINVAL; 2655 } 2656 2657 addr = nla_data(tb[NDA_LLADDR]); 2658 2659 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2660 if (err) 2661 return err; 2662 2663 err = -EOPNOTSUPP; 2664 2665 /* Support fdb on master device the net/bridge default case */ 2666 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2667 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2668 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2669 const struct net_device_ops *ops = br_dev->netdev_ops; 2670 2671 if (ops->ndo_fdb_del) 2672 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 2673 2674 if (err) 2675 goto out; 2676 else 2677 ndm->ndm_flags &= ~NTF_MASTER; 2678 } 2679 2680 /* Embedded bridge, macvlan, and any other device support */ 2681 if (ndm->ndm_flags & NTF_SELF) { 2682 if (dev->netdev_ops->ndo_fdb_del) 2683 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 2684 vid); 2685 else 2686 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 2687 2688 if (!err) { 2689 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH); 2690 ndm->ndm_flags &= ~NTF_SELF; 2691 } 2692 } 2693 out: 2694 return err; 2695 } 2696 2697 static int nlmsg_populate_fdb(struct sk_buff *skb, 2698 struct netlink_callback *cb, 2699 struct net_device *dev, 2700 int *idx, 2701 struct netdev_hw_addr_list *list) 2702 { 2703 struct netdev_hw_addr *ha; 2704 int err; 2705 u32 portid, seq; 2706 2707 portid = NETLINK_CB(cb->skb).portid; 2708 seq = cb->nlh->nlmsg_seq; 2709 2710 list_for_each_entry(ha, &list->list, list) { 2711 if (*idx < cb->args[0]) 2712 goto skip; 2713 2714 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 2715 portid, seq, 2716 RTM_NEWNEIGH, NTF_SELF, 2717 NLM_F_MULTI); 2718 if (err < 0) 2719 return err; 2720 skip: 2721 *idx += 1; 2722 } 2723 return 0; 2724 } 2725 2726 /** 2727 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2728 * @nlh: netlink message header 2729 * @dev: netdevice 2730 * 2731 * Default netdevice operation to dump the existing unicast address list. 2732 * Returns number of addresses from list put in skb. 2733 */ 2734 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2735 struct netlink_callback *cb, 2736 struct net_device *dev, 2737 struct net_device *filter_dev, 2738 int idx) 2739 { 2740 int err; 2741 2742 netif_addr_lock_bh(dev); 2743 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2744 if (err) 2745 goto out; 2746 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2747 out: 2748 netif_addr_unlock_bh(dev); 2749 return idx; 2750 } 2751 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2752 2753 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2754 { 2755 struct net_device *dev; 2756 struct nlattr *tb[IFLA_MAX+1]; 2757 struct net_device *bdev = NULL; 2758 struct net_device *br_dev = NULL; 2759 const struct net_device_ops *ops = NULL; 2760 const struct net_device_ops *cops = NULL; 2761 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2762 struct net *net = sock_net(skb->sk); 2763 int brport_idx = 0; 2764 int br_idx = 0; 2765 int idx = 0; 2766 2767 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 2768 ifla_policy) == 0) { 2769 if (tb[IFLA_MASTER]) 2770 br_idx = nla_get_u32(tb[IFLA_MASTER]); 2771 } 2772 2773 brport_idx = ifm->ifi_index; 2774 2775 if (br_idx) { 2776 br_dev = __dev_get_by_index(net, br_idx); 2777 if (!br_dev) 2778 return -ENODEV; 2779 2780 ops = br_dev->netdev_ops; 2781 bdev = br_dev; 2782 } 2783 2784 for_each_netdev(net, dev) { 2785 if (brport_idx && (dev->ifindex != brport_idx)) 2786 continue; 2787 2788 if (!br_idx) { /* user did not specify a specific bridge */ 2789 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2790 br_dev = netdev_master_upper_dev_get(dev); 2791 cops = br_dev->netdev_ops; 2792 } 2793 2794 bdev = dev; 2795 } else { 2796 if (dev != br_dev && 2797 !(dev->priv_flags & IFF_BRIDGE_PORT)) 2798 continue; 2799 2800 if (br_dev != netdev_master_upper_dev_get(dev) && 2801 !(dev->priv_flags & IFF_EBRIDGE)) 2802 continue; 2803 2804 bdev = br_dev; 2805 cops = ops; 2806 } 2807 2808 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2809 if (cops && cops->ndo_fdb_dump) 2810 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 2811 idx); 2812 } 2813 2814 if (dev->netdev_ops->ndo_fdb_dump) 2815 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL, 2816 idx); 2817 else 2818 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 2819 2820 cops = NULL; 2821 } 2822 2823 cb->args[0] = idx; 2824 return skb->len; 2825 } 2826 2827 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 2828 unsigned int attrnum, unsigned int flag) 2829 { 2830 if (mask & flag) 2831 return nla_put_u8(skb, attrnum, !!(flags & flag)); 2832 return 0; 2833 } 2834 2835 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2836 struct net_device *dev, u16 mode, 2837 u32 flags, u32 mask) 2838 { 2839 struct nlmsghdr *nlh; 2840 struct ifinfomsg *ifm; 2841 struct nlattr *br_afspec; 2842 struct nlattr *protinfo; 2843 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2844 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2845 2846 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI); 2847 if (nlh == NULL) 2848 return -EMSGSIZE; 2849 2850 ifm = nlmsg_data(nlh); 2851 ifm->ifi_family = AF_BRIDGE; 2852 ifm->__ifi_pad = 0; 2853 ifm->ifi_type = dev->type; 2854 ifm->ifi_index = dev->ifindex; 2855 ifm->ifi_flags = dev_get_flags(dev); 2856 ifm->ifi_change = 0; 2857 2858 2859 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2860 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2861 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2862 (br_dev && 2863 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2864 (dev->addr_len && 2865 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2866 (dev->ifindex != dev->iflink && 2867 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 2868 goto nla_put_failure; 2869 2870 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2871 if (!br_afspec) 2872 goto nla_put_failure; 2873 2874 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 2875 nla_nest_cancel(skb, br_afspec); 2876 goto nla_put_failure; 2877 } 2878 2879 if (mode != BRIDGE_MODE_UNDEF) { 2880 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2881 nla_nest_cancel(skb, br_afspec); 2882 goto nla_put_failure; 2883 } 2884 } 2885 nla_nest_end(skb, br_afspec); 2886 2887 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 2888 if (!protinfo) 2889 goto nla_put_failure; 2890 2891 if (brport_nla_put_flag(skb, flags, mask, 2892 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 2893 brport_nla_put_flag(skb, flags, mask, 2894 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 2895 brport_nla_put_flag(skb, flags, mask, 2896 IFLA_BRPORT_FAST_LEAVE, 2897 BR_MULTICAST_FAST_LEAVE) || 2898 brport_nla_put_flag(skb, flags, mask, 2899 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 2900 brport_nla_put_flag(skb, flags, mask, 2901 IFLA_BRPORT_LEARNING, BR_LEARNING) || 2902 brport_nla_put_flag(skb, flags, mask, 2903 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 2904 brport_nla_put_flag(skb, flags, mask, 2905 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 2906 brport_nla_put_flag(skb, flags, mask, 2907 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 2908 nla_nest_cancel(skb, protinfo); 2909 goto nla_put_failure; 2910 } 2911 2912 nla_nest_end(skb, protinfo); 2913 2914 nlmsg_end(skb, nlh); 2915 return 0; 2916 nla_put_failure: 2917 nlmsg_cancel(skb, nlh); 2918 return -EMSGSIZE; 2919 } 2920 EXPORT_SYMBOL(ndo_dflt_bridge_getlink); 2921 2922 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 2923 { 2924 struct net *net = sock_net(skb->sk); 2925 struct net_device *dev; 2926 int idx = 0; 2927 u32 portid = NETLINK_CB(cb->skb).portid; 2928 u32 seq = cb->nlh->nlmsg_seq; 2929 u32 filter_mask = 0; 2930 2931 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 2932 struct nlattr *extfilt; 2933 2934 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 2935 IFLA_EXT_MASK); 2936 if (extfilt) { 2937 if (nla_len(extfilt) < sizeof(filter_mask)) 2938 return -EINVAL; 2939 2940 filter_mask = nla_get_u32(extfilt); 2941 } 2942 } 2943 2944 rcu_read_lock(); 2945 for_each_netdev_rcu(net, dev) { 2946 const struct net_device_ops *ops = dev->netdev_ops; 2947 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2948 2949 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2950 if (idx >= cb->args[0] && 2951 br_dev->netdev_ops->ndo_bridge_getlink( 2952 skb, portid, seq, dev, filter_mask) < 0) 2953 break; 2954 idx++; 2955 } 2956 2957 if (ops->ndo_bridge_getlink) { 2958 if (idx >= cb->args[0] && 2959 ops->ndo_bridge_getlink(skb, portid, seq, dev, 2960 filter_mask) < 0) 2961 break; 2962 idx++; 2963 } 2964 } 2965 rcu_read_unlock(); 2966 cb->args[0] = idx; 2967 2968 return skb->len; 2969 } 2970 2971 static inline size_t bridge_nlmsg_size(void) 2972 { 2973 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 2974 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 2975 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 2976 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 2977 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 2978 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 2979 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 2980 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 2981 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 2982 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 2983 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 2984 } 2985 2986 static int rtnl_bridge_notify(struct net_device *dev) 2987 { 2988 struct net *net = dev_net(dev); 2989 struct sk_buff *skb; 2990 int err = -EOPNOTSUPP; 2991 2992 if (!dev->netdev_ops->ndo_bridge_getlink) 2993 return 0; 2994 2995 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 2996 if (!skb) { 2997 err = -ENOMEM; 2998 goto errout; 2999 } 3000 3001 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 3002 if (err < 0) 3003 goto errout; 3004 3005 if (!skb->len) 3006 goto errout; 3007 3008 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3009 return 0; 3010 errout: 3011 WARN_ON(err == -EMSGSIZE); 3012 kfree_skb(skb); 3013 if (err) 3014 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3015 return err; 3016 } 3017 3018 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3019 { 3020 struct net *net = sock_net(skb->sk); 3021 struct ifinfomsg *ifm; 3022 struct net_device *dev; 3023 struct nlattr *br_spec, *attr = NULL; 3024 int rem, err = -EOPNOTSUPP; 3025 u16 flags = 0; 3026 bool have_flags = false; 3027 3028 if (nlmsg_len(nlh) < sizeof(*ifm)) 3029 return -EINVAL; 3030 3031 ifm = nlmsg_data(nlh); 3032 if (ifm->ifi_family != AF_BRIDGE) 3033 return -EPFNOSUPPORT; 3034 3035 dev = __dev_get_by_index(net, ifm->ifi_index); 3036 if (!dev) { 3037 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3038 return -ENODEV; 3039 } 3040 3041 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3042 if (br_spec) { 3043 nla_for_each_nested(attr, br_spec, rem) { 3044 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3045 if (nla_len(attr) < sizeof(flags)) 3046 return -EINVAL; 3047 3048 have_flags = true; 3049 flags = nla_get_u16(attr); 3050 break; 3051 } 3052 } 3053 } 3054 3055 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3056 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3057 3058 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3059 err = -EOPNOTSUPP; 3060 goto out; 3061 } 3062 3063 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3064 if (err) 3065 goto out; 3066 3067 flags &= ~BRIDGE_FLAGS_MASTER; 3068 } 3069 3070 if ((flags & BRIDGE_FLAGS_SELF)) { 3071 if (!dev->netdev_ops->ndo_bridge_setlink) 3072 err = -EOPNOTSUPP; 3073 else 3074 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3075 flags); 3076 if (!err) { 3077 flags &= ~BRIDGE_FLAGS_SELF; 3078 3079 /* Generate event to notify upper layer of bridge 3080 * change 3081 */ 3082 err = rtnl_bridge_notify(dev); 3083 } 3084 } 3085 3086 if (have_flags) 3087 memcpy(nla_data(attr), &flags, sizeof(flags)); 3088 out: 3089 return err; 3090 } 3091 3092 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3093 { 3094 struct net *net = sock_net(skb->sk); 3095 struct ifinfomsg *ifm; 3096 struct net_device *dev; 3097 struct nlattr *br_spec, *attr = NULL; 3098 int rem, err = -EOPNOTSUPP; 3099 u16 flags = 0; 3100 bool have_flags = false; 3101 3102 if (nlmsg_len(nlh) < sizeof(*ifm)) 3103 return -EINVAL; 3104 3105 ifm = nlmsg_data(nlh); 3106 if (ifm->ifi_family != AF_BRIDGE) 3107 return -EPFNOSUPPORT; 3108 3109 dev = __dev_get_by_index(net, ifm->ifi_index); 3110 if (!dev) { 3111 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3112 return -ENODEV; 3113 } 3114 3115 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3116 if (br_spec) { 3117 nla_for_each_nested(attr, br_spec, rem) { 3118 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3119 if (nla_len(attr) < sizeof(flags)) 3120 return -EINVAL; 3121 3122 have_flags = true; 3123 flags = nla_get_u16(attr); 3124 break; 3125 } 3126 } 3127 } 3128 3129 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3130 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3131 3132 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3133 err = -EOPNOTSUPP; 3134 goto out; 3135 } 3136 3137 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3138 if (err) 3139 goto out; 3140 3141 flags &= ~BRIDGE_FLAGS_MASTER; 3142 } 3143 3144 if ((flags & BRIDGE_FLAGS_SELF)) { 3145 if (!dev->netdev_ops->ndo_bridge_dellink) 3146 err = -EOPNOTSUPP; 3147 else 3148 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3149 flags); 3150 3151 if (!err) { 3152 flags &= ~BRIDGE_FLAGS_SELF; 3153 3154 /* Generate event to notify upper layer of bridge 3155 * change 3156 */ 3157 err = rtnl_bridge_notify(dev); 3158 } 3159 } 3160 3161 if (have_flags) 3162 memcpy(nla_data(attr), &flags, sizeof(flags)); 3163 out: 3164 return err; 3165 } 3166 3167 /* Process one rtnetlink message. */ 3168 3169 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3170 { 3171 struct net *net = sock_net(skb->sk); 3172 rtnl_doit_func doit; 3173 int sz_idx, kind; 3174 int family; 3175 int type; 3176 int err; 3177 3178 type = nlh->nlmsg_type; 3179 if (type > RTM_MAX) 3180 return -EOPNOTSUPP; 3181 3182 type -= RTM_BASE; 3183 3184 /* All the messages must have at least 1 byte length */ 3185 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3186 return 0; 3187 3188 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3189 sz_idx = type>>2; 3190 kind = type&3; 3191 3192 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3193 return -EPERM; 3194 3195 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 3196 struct sock *rtnl; 3197 rtnl_dumpit_func dumpit; 3198 rtnl_calcit_func calcit; 3199 u16 min_dump_alloc = 0; 3200 3201 dumpit = rtnl_get_dumpit(family, type); 3202 if (dumpit == NULL) 3203 return -EOPNOTSUPP; 3204 calcit = rtnl_get_calcit(family, type); 3205 if (calcit) 3206 min_dump_alloc = calcit(skb, nlh); 3207 3208 __rtnl_unlock(); 3209 rtnl = net->rtnl; 3210 { 3211 struct netlink_dump_control c = { 3212 .dump = dumpit, 3213 .min_dump_alloc = min_dump_alloc, 3214 }; 3215 err = netlink_dump_start(rtnl, skb, nlh, &c); 3216 } 3217 rtnl_lock(); 3218 return err; 3219 } 3220 3221 doit = rtnl_get_doit(family, type); 3222 if (doit == NULL) 3223 return -EOPNOTSUPP; 3224 3225 return doit(skb, nlh); 3226 } 3227 3228 static void rtnetlink_rcv(struct sk_buff *skb) 3229 { 3230 rtnl_lock(); 3231 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 3232 rtnl_unlock(); 3233 } 3234 3235 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 3236 { 3237 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3238 3239 switch (event) { 3240 case NETDEV_UP: 3241 case NETDEV_DOWN: 3242 case NETDEV_PRE_UP: 3243 case NETDEV_POST_INIT: 3244 case NETDEV_REGISTER: 3245 case NETDEV_CHANGE: 3246 case NETDEV_PRE_TYPE_CHANGE: 3247 case NETDEV_GOING_DOWN: 3248 case NETDEV_UNREGISTER: 3249 case NETDEV_UNREGISTER_FINAL: 3250 case NETDEV_RELEASE: 3251 case NETDEV_JOIN: 3252 case NETDEV_BONDING_INFO: 3253 break; 3254 default: 3255 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3256 break; 3257 } 3258 return NOTIFY_DONE; 3259 } 3260 3261 static struct notifier_block rtnetlink_dev_notifier = { 3262 .notifier_call = rtnetlink_event, 3263 }; 3264 3265 3266 static int __net_init rtnetlink_net_init(struct net *net) 3267 { 3268 struct sock *sk; 3269 struct netlink_kernel_cfg cfg = { 3270 .groups = RTNLGRP_MAX, 3271 .input = rtnetlink_rcv, 3272 .cb_mutex = &rtnl_mutex, 3273 .flags = NL_CFG_F_NONROOT_RECV, 3274 }; 3275 3276 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3277 if (!sk) 3278 return -ENOMEM; 3279 net->rtnl = sk; 3280 return 0; 3281 } 3282 3283 static void __net_exit rtnetlink_net_exit(struct net *net) 3284 { 3285 netlink_kernel_release(net->rtnl); 3286 net->rtnl = NULL; 3287 } 3288 3289 static struct pernet_operations rtnetlink_net_ops = { 3290 .init = rtnetlink_net_init, 3291 .exit = rtnetlink_net_exit, 3292 }; 3293 3294 void __init rtnetlink_init(void) 3295 { 3296 if (register_pernet_subsys(&rtnetlink_net_ops)) 3297 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3298 3299 register_netdevice_notifier(&rtnetlink_dev_notifier); 3300 3301 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3302 rtnl_dump_ifinfo, rtnl_calcit); 3303 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3304 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3305 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3306 3307 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3308 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3309 3310 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3311 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3312 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3313 3314 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3315 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3316 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3317 } 3318 3319