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 return size; 824 } else 825 return 0; 826 } 827 828 static size_t rtnl_port_size(const struct net_device *dev, 829 u32 ext_filter_mask) 830 { 831 size_t port_size = nla_total_size(4) /* PORT_VF */ 832 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 833 + nla_total_size(sizeof(struct ifla_port_vsi)) 834 /* PORT_VSI_TYPE */ 835 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 836 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 837 + nla_total_size(1) /* PROT_VDP_REQUEST */ 838 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 839 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 840 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 841 + port_size; 842 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 843 + port_size; 844 845 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 846 !(ext_filter_mask & RTEXT_FILTER_VF)) 847 return 0; 848 if (dev_num_vf(dev->dev.parent)) 849 return port_self_size + vf_ports_size + 850 vf_port_size * dev_num_vf(dev->dev.parent); 851 else 852 return port_self_size; 853 } 854 855 static noinline size_t if_nlmsg_size(const struct net_device *dev, 856 u32 ext_filter_mask) 857 { 858 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 859 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 860 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 861 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 862 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 863 + nla_total_size(sizeof(struct rtnl_link_stats)) 864 + nla_total_size(sizeof(struct rtnl_link_stats64)) 865 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 866 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 867 + nla_total_size(4) /* IFLA_TXQLEN */ 868 + nla_total_size(4) /* IFLA_WEIGHT */ 869 + nla_total_size(4) /* IFLA_MTU */ 870 + nla_total_size(4) /* IFLA_LINK */ 871 + nla_total_size(4) /* IFLA_MASTER */ 872 + nla_total_size(1) /* IFLA_CARRIER */ 873 + nla_total_size(4) /* IFLA_PROMISCUITY */ 874 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 875 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 876 + nla_total_size(1) /* IFLA_OPERSTATE */ 877 + nla_total_size(1) /* IFLA_LINKMODE */ 878 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 879 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 880 + nla_total_size(ext_filter_mask 881 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 882 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 883 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 884 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 885 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */ 886 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 887 + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_SWITCH_ID */ 888 } 889 890 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 891 { 892 struct nlattr *vf_ports; 893 struct nlattr *vf_port; 894 int vf; 895 int err; 896 897 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 898 if (!vf_ports) 899 return -EMSGSIZE; 900 901 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 902 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 903 if (!vf_port) 904 goto nla_put_failure; 905 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 906 goto nla_put_failure; 907 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 908 if (err == -EMSGSIZE) 909 goto nla_put_failure; 910 if (err) { 911 nla_nest_cancel(skb, vf_port); 912 continue; 913 } 914 nla_nest_end(skb, vf_port); 915 } 916 917 nla_nest_end(skb, vf_ports); 918 919 return 0; 920 921 nla_put_failure: 922 nla_nest_cancel(skb, vf_ports); 923 return -EMSGSIZE; 924 } 925 926 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 927 { 928 struct nlattr *port_self; 929 int err; 930 931 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 932 if (!port_self) 933 return -EMSGSIZE; 934 935 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 936 if (err) { 937 nla_nest_cancel(skb, port_self); 938 return (err == -EMSGSIZE) ? err : 0; 939 } 940 941 nla_nest_end(skb, port_self); 942 943 return 0; 944 } 945 946 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 947 u32 ext_filter_mask) 948 { 949 int err; 950 951 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 952 !(ext_filter_mask & RTEXT_FILTER_VF)) 953 return 0; 954 955 err = rtnl_port_self_fill(skb, dev); 956 if (err) 957 return err; 958 959 if (dev_num_vf(dev->dev.parent)) { 960 err = rtnl_vf_ports_fill(skb, dev); 961 if (err) 962 return err; 963 } 964 965 return 0; 966 } 967 968 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 969 { 970 int err; 971 struct netdev_phys_item_id ppid; 972 973 err = dev_get_phys_port_id(dev, &ppid); 974 if (err) { 975 if (err == -EOPNOTSUPP) 976 return 0; 977 return err; 978 } 979 980 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 981 return -EMSGSIZE; 982 983 return 0; 984 } 985 986 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 987 { 988 char name[IFNAMSIZ]; 989 int err; 990 991 err = dev_get_phys_port_name(dev, name, sizeof(name)); 992 if (err) { 993 if (err == -EOPNOTSUPP) 994 return 0; 995 return err; 996 } 997 998 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 999 return -EMSGSIZE; 1000 1001 return 0; 1002 } 1003 1004 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1005 { 1006 int err; 1007 struct switchdev_attr attr = { 1008 .id = SWITCHDEV_ATTR_PORT_PARENT_ID, 1009 .flags = SWITCHDEV_F_NO_RECURSE, 1010 }; 1011 1012 err = switchdev_port_attr_get(dev, &attr); 1013 if (err) { 1014 if (err == -EOPNOTSUPP) 1015 return 0; 1016 return err; 1017 } 1018 1019 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1020 attr.u.ppid.id)) 1021 return -EMSGSIZE; 1022 1023 return 0; 1024 } 1025 1026 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1027 int type, u32 pid, u32 seq, u32 change, 1028 unsigned int flags, u32 ext_filter_mask) 1029 { 1030 struct ifinfomsg *ifm; 1031 struct nlmsghdr *nlh; 1032 struct rtnl_link_stats64 temp; 1033 const struct rtnl_link_stats64 *stats; 1034 struct nlattr *attr, *af_spec; 1035 struct rtnl_af_ops *af_ops; 1036 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1037 1038 ASSERT_RTNL(); 1039 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1040 if (nlh == NULL) 1041 return -EMSGSIZE; 1042 1043 ifm = nlmsg_data(nlh); 1044 ifm->ifi_family = AF_UNSPEC; 1045 ifm->__ifi_pad = 0; 1046 ifm->ifi_type = dev->type; 1047 ifm->ifi_index = dev->ifindex; 1048 ifm->ifi_flags = dev_get_flags(dev); 1049 ifm->ifi_change = change; 1050 1051 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1052 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1053 nla_put_u8(skb, IFLA_OPERSTATE, 1054 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1055 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1056 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1057 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1058 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1059 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1060 #ifdef CONFIG_RPS 1061 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1062 #endif 1063 (dev->ifindex != dev_get_iflink(dev) && 1064 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1065 (upper_dev && 1066 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1067 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1068 (dev->qdisc && 1069 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1070 (dev->ifalias && 1071 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1072 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1073 atomic_read(&dev->carrier_changes))) 1074 goto nla_put_failure; 1075 1076 if (1) { 1077 struct rtnl_link_ifmap map = { 1078 .mem_start = dev->mem_start, 1079 .mem_end = dev->mem_end, 1080 .base_addr = dev->base_addr, 1081 .irq = dev->irq, 1082 .dma = dev->dma, 1083 .port = dev->if_port, 1084 }; 1085 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1086 goto nla_put_failure; 1087 } 1088 1089 if (dev->addr_len) { 1090 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1091 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1092 goto nla_put_failure; 1093 } 1094 1095 if (rtnl_phys_port_id_fill(skb, dev)) 1096 goto nla_put_failure; 1097 1098 if (rtnl_phys_port_name_fill(skb, dev)) 1099 goto nla_put_failure; 1100 1101 if (rtnl_phys_switch_id_fill(skb, dev)) 1102 goto nla_put_failure; 1103 1104 attr = nla_reserve(skb, IFLA_STATS, 1105 sizeof(struct rtnl_link_stats)); 1106 if (attr == NULL) 1107 goto nla_put_failure; 1108 1109 stats = dev_get_stats(dev, &temp); 1110 copy_rtnl_link_stats(nla_data(attr), stats); 1111 1112 attr = nla_reserve(skb, IFLA_STATS64, 1113 sizeof(struct rtnl_link_stats64)); 1114 if (attr == NULL) 1115 goto nla_put_failure; 1116 copy_rtnl_link_stats64(nla_data(attr), stats); 1117 1118 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1119 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1120 goto nla_put_failure; 1121 1122 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 1123 && (ext_filter_mask & RTEXT_FILTER_VF)) { 1124 int i; 1125 1126 struct nlattr *vfinfo, *vf; 1127 int num_vfs = dev_num_vf(dev->dev.parent); 1128 1129 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1130 if (!vfinfo) 1131 goto nla_put_failure; 1132 for (i = 0; i < num_vfs; i++) { 1133 struct ifla_vf_info ivi; 1134 struct ifla_vf_mac vf_mac; 1135 struct ifla_vf_vlan vf_vlan; 1136 struct ifla_vf_rate vf_rate; 1137 struct ifla_vf_tx_rate vf_tx_rate; 1138 struct ifla_vf_spoofchk vf_spoofchk; 1139 struct ifla_vf_link_state vf_linkstate; 1140 struct ifla_vf_rss_query_en vf_rss_query_en; 1141 1142 /* 1143 * Not all SR-IOV capable drivers support the 1144 * spoofcheck and "RSS query enable" query. Preset to 1145 * -1 so the user space tool can detect that the driver 1146 * didn't report anything. 1147 */ 1148 ivi.spoofchk = -1; 1149 ivi.rss_query_en = -1; 1150 memset(ivi.mac, 0, sizeof(ivi.mac)); 1151 /* The default value for VF link state is "auto" 1152 * IFLA_VF_LINK_STATE_AUTO which equals zero 1153 */ 1154 ivi.linkstate = 0; 1155 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 1156 break; 1157 vf_mac.vf = 1158 vf_vlan.vf = 1159 vf_rate.vf = 1160 vf_tx_rate.vf = 1161 vf_spoofchk.vf = 1162 vf_linkstate.vf = 1163 vf_rss_query_en.vf = ivi.vf; 1164 1165 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1166 vf_vlan.vlan = ivi.vlan; 1167 vf_vlan.qos = ivi.qos; 1168 vf_tx_rate.rate = ivi.max_tx_rate; 1169 vf_rate.min_tx_rate = ivi.min_tx_rate; 1170 vf_rate.max_tx_rate = ivi.max_tx_rate; 1171 vf_spoofchk.setting = ivi.spoofchk; 1172 vf_linkstate.link_state = ivi.linkstate; 1173 vf_rss_query_en.setting = ivi.rss_query_en; 1174 vf = nla_nest_start(skb, IFLA_VF_INFO); 1175 if (!vf) { 1176 nla_nest_cancel(skb, vfinfo); 1177 goto nla_put_failure; 1178 } 1179 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1180 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1181 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1182 &vf_rate) || 1183 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1184 &vf_tx_rate) || 1185 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1186 &vf_spoofchk) || 1187 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1188 &vf_linkstate) || 1189 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1190 sizeof(vf_rss_query_en), 1191 &vf_rss_query_en)) 1192 goto nla_put_failure; 1193 nla_nest_end(skb, vf); 1194 } 1195 nla_nest_end(skb, vfinfo); 1196 } 1197 1198 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1199 goto nla_put_failure; 1200 1201 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1202 if (rtnl_link_fill(skb, dev) < 0) 1203 goto nla_put_failure; 1204 } 1205 1206 if (dev->rtnl_link_ops && 1207 dev->rtnl_link_ops->get_link_net) { 1208 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1209 1210 if (!net_eq(dev_net(dev), link_net)) { 1211 int id = peernet2id_alloc(dev_net(dev), link_net); 1212 1213 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1214 goto nla_put_failure; 1215 } 1216 } 1217 1218 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1219 goto nla_put_failure; 1220 1221 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1222 if (af_ops->fill_link_af) { 1223 struct nlattr *af; 1224 int err; 1225 1226 if (!(af = nla_nest_start(skb, af_ops->family))) 1227 goto nla_put_failure; 1228 1229 err = af_ops->fill_link_af(skb, dev); 1230 1231 /* 1232 * Caller may return ENODATA to indicate that there 1233 * was no data to be dumped. This is not an error, it 1234 * means we should trim the attribute header and 1235 * continue. 1236 */ 1237 if (err == -ENODATA) 1238 nla_nest_cancel(skb, af); 1239 else if (err < 0) 1240 goto nla_put_failure; 1241 1242 nla_nest_end(skb, af); 1243 } 1244 } 1245 1246 nla_nest_end(skb, af_spec); 1247 1248 nlmsg_end(skb, nlh); 1249 return 0; 1250 1251 nla_put_failure: 1252 nlmsg_cancel(skb, nlh); 1253 return -EMSGSIZE; 1254 } 1255 1256 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1257 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1258 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1259 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1260 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1261 [IFLA_MTU] = { .type = NLA_U32 }, 1262 [IFLA_LINK] = { .type = NLA_U32 }, 1263 [IFLA_MASTER] = { .type = NLA_U32 }, 1264 [IFLA_CARRIER] = { .type = NLA_U8 }, 1265 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1266 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1267 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1268 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1269 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1270 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1271 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1272 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1273 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1274 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1275 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1276 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1277 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1278 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1279 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1280 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1281 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1282 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1283 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1284 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1285 }; 1286 1287 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1288 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1289 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1290 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1291 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1292 }; 1293 1294 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1295 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1296 }; 1297 1298 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1299 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1300 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1301 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1302 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1303 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1304 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1305 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1306 }; 1307 1308 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1309 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1310 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1311 .len = PORT_PROFILE_MAX }, 1312 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1313 .len = sizeof(struct ifla_port_vsi)}, 1314 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1315 .len = PORT_UUID_MAX }, 1316 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1317 .len = PORT_UUID_MAX }, 1318 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1319 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1320 }; 1321 1322 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1323 { 1324 struct net *net = sock_net(skb->sk); 1325 int h, s_h; 1326 int idx = 0, s_idx; 1327 struct net_device *dev; 1328 struct hlist_head *head; 1329 struct nlattr *tb[IFLA_MAX+1]; 1330 u32 ext_filter_mask = 0; 1331 int err; 1332 int hdrlen; 1333 1334 s_h = cb->args[0]; 1335 s_idx = cb->args[1]; 1336 1337 cb->seq = net->dev_base_seq; 1338 1339 /* A hack to preserve kernel<->userspace interface. 1340 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1341 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1342 * what iproute2 < v3.9.0 used. 1343 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1344 * attribute, its netlink message is shorter than struct ifinfomsg. 1345 */ 1346 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1347 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1348 1349 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1350 1351 if (tb[IFLA_EXT_MASK]) 1352 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1353 } 1354 1355 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1356 idx = 0; 1357 head = &net->dev_index_head[h]; 1358 hlist_for_each_entry(dev, head, index_hlist) { 1359 if (idx < s_idx) 1360 goto cont; 1361 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1362 NETLINK_CB(cb->skb).portid, 1363 cb->nlh->nlmsg_seq, 0, 1364 NLM_F_MULTI, 1365 ext_filter_mask); 1366 /* If we ran out of room on the first message, 1367 * we're in trouble 1368 */ 1369 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1370 1371 if (err < 0) 1372 goto out; 1373 1374 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1375 cont: 1376 idx++; 1377 } 1378 } 1379 out: 1380 cb->args[1] = idx; 1381 cb->args[0] = h; 1382 1383 return skb->len; 1384 } 1385 1386 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1387 { 1388 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1389 } 1390 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1391 1392 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1393 { 1394 struct net *net; 1395 /* Examine the link attributes and figure out which 1396 * network namespace we are talking about. 1397 */ 1398 if (tb[IFLA_NET_NS_PID]) 1399 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1400 else if (tb[IFLA_NET_NS_FD]) 1401 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1402 else 1403 net = get_net(src_net); 1404 return net; 1405 } 1406 EXPORT_SYMBOL(rtnl_link_get_net); 1407 1408 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1409 { 1410 if (dev) { 1411 if (tb[IFLA_ADDRESS] && 1412 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1413 return -EINVAL; 1414 1415 if (tb[IFLA_BROADCAST] && 1416 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1417 return -EINVAL; 1418 } 1419 1420 if (tb[IFLA_AF_SPEC]) { 1421 struct nlattr *af; 1422 int rem, err; 1423 1424 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1425 const struct rtnl_af_ops *af_ops; 1426 1427 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1428 return -EAFNOSUPPORT; 1429 1430 if (!af_ops->set_link_af) 1431 return -EOPNOTSUPP; 1432 1433 if (af_ops->validate_link_af) { 1434 err = af_ops->validate_link_af(dev, af); 1435 if (err < 0) 1436 return err; 1437 } 1438 } 1439 } 1440 1441 return 0; 1442 } 1443 1444 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1445 { 1446 int rem, err = -EINVAL; 1447 struct nlattr *vf; 1448 const struct net_device_ops *ops = dev->netdev_ops; 1449 1450 nla_for_each_nested(vf, attr, rem) { 1451 switch (nla_type(vf)) { 1452 case IFLA_VF_MAC: { 1453 struct ifla_vf_mac *ivm; 1454 ivm = nla_data(vf); 1455 err = -EOPNOTSUPP; 1456 if (ops->ndo_set_vf_mac) 1457 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1458 ivm->mac); 1459 break; 1460 } 1461 case IFLA_VF_VLAN: { 1462 struct ifla_vf_vlan *ivv; 1463 ivv = nla_data(vf); 1464 err = -EOPNOTSUPP; 1465 if (ops->ndo_set_vf_vlan) 1466 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1467 ivv->vlan, 1468 ivv->qos); 1469 break; 1470 } 1471 case IFLA_VF_TX_RATE: { 1472 struct ifla_vf_tx_rate *ivt; 1473 struct ifla_vf_info ivf; 1474 ivt = nla_data(vf); 1475 err = -EOPNOTSUPP; 1476 if (ops->ndo_get_vf_config) 1477 err = ops->ndo_get_vf_config(dev, ivt->vf, 1478 &ivf); 1479 if (err) 1480 break; 1481 err = -EOPNOTSUPP; 1482 if (ops->ndo_set_vf_rate) 1483 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1484 ivf.min_tx_rate, 1485 ivt->rate); 1486 break; 1487 } 1488 case IFLA_VF_RATE: { 1489 struct ifla_vf_rate *ivt; 1490 ivt = nla_data(vf); 1491 err = -EOPNOTSUPP; 1492 if (ops->ndo_set_vf_rate) 1493 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1494 ivt->min_tx_rate, 1495 ivt->max_tx_rate); 1496 break; 1497 } 1498 case IFLA_VF_SPOOFCHK: { 1499 struct ifla_vf_spoofchk *ivs; 1500 ivs = nla_data(vf); 1501 err = -EOPNOTSUPP; 1502 if (ops->ndo_set_vf_spoofchk) 1503 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1504 ivs->setting); 1505 break; 1506 } 1507 case IFLA_VF_LINK_STATE: { 1508 struct ifla_vf_link_state *ivl; 1509 ivl = nla_data(vf); 1510 err = -EOPNOTSUPP; 1511 if (ops->ndo_set_vf_link_state) 1512 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1513 ivl->link_state); 1514 break; 1515 } 1516 case IFLA_VF_RSS_QUERY_EN: { 1517 struct ifla_vf_rss_query_en *ivrssq_en; 1518 1519 ivrssq_en = nla_data(vf); 1520 err = -EOPNOTSUPP; 1521 if (ops->ndo_set_vf_rss_query_en) 1522 err = ops->ndo_set_vf_rss_query_en(dev, 1523 ivrssq_en->vf, 1524 ivrssq_en->setting); 1525 break; 1526 } 1527 default: 1528 err = -EINVAL; 1529 break; 1530 } 1531 if (err) 1532 break; 1533 } 1534 return err; 1535 } 1536 1537 static int do_set_master(struct net_device *dev, int ifindex) 1538 { 1539 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1540 const struct net_device_ops *ops; 1541 int err; 1542 1543 if (upper_dev) { 1544 if (upper_dev->ifindex == ifindex) 1545 return 0; 1546 ops = upper_dev->netdev_ops; 1547 if (ops->ndo_del_slave) { 1548 err = ops->ndo_del_slave(upper_dev, dev); 1549 if (err) 1550 return err; 1551 } else { 1552 return -EOPNOTSUPP; 1553 } 1554 } 1555 1556 if (ifindex) { 1557 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1558 if (!upper_dev) 1559 return -EINVAL; 1560 ops = upper_dev->netdev_ops; 1561 if (ops->ndo_add_slave) { 1562 err = ops->ndo_add_slave(upper_dev, dev); 1563 if (err) 1564 return err; 1565 } else { 1566 return -EOPNOTSUPP; 1567 } 1568 } 1569 return 0; 1570 } 1571 1572 #define DO_SETLINK_MODIFIED 0x01 1573 /* notify flag means notify + modified. */ 1574 #define DO_SETLINK_NOTIFY 0x03 1575 static int do_setlink(const struct sk_buff *skb, 1576 struct net_device *dev, struct ifinfomsg *ifm, 1577 struct nlattr **tb, char *ifname, int status) 1578 { 1579 const struct net_device_ops *ops = dev->netdev_ops; 1580 int err; 1581 1582 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1583 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1584 if (IS_ERR(net)) { 1585 err = PTR_ERR(net); 1586 goto errout; 1587 } 1588 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1589 put_net(net); 1590 err = -EPERM; 1591 goto errout; 1592 } 1593 err = dev_change_net_namespace(dev, net, ifname); 1594 put_net(net); 1595 if (err) 1596 goto errout; 1597 status |= DO_SETLINK_MODIFIED; 1598 } 1599 1600 if (tb[IFLA_MAP]) { 1601 struct rtnl_link_ifmap *u_map; 1602 struct ifmap k_map; 1603 1604 if (!ops->ndo_set_config) { 1605 err = -EOPNOTSUPP; 1606 goto errout; 1607 } 1608 1609 if (!netif_device_present(dev)) { 1610 err = -ENODEV; 1611 goto errout; 1612 } 1613 1614 u_map = nla_data(tb[IFLA_MAP]); 1615 k_map.mem_start = (unsigned long) u_map->mem_start; 1616 k_map.mem_end = (unsigned long) u_map->mem_end; 1617 k_map.base_addr = (unsigned short) u_map->base_addr; 1618 k_map.irq = (unsigned char) u_map->irq; 1619 k_map.dma = (unsigned char) u_map->dma; 1620 k_map.port = (unsigned char) u_map->port; 1621 1622 err = ops->ndo_set_config(dev, &k_map); 1623 if (err < 0) 1624 goto errout; 1625 1626 status |= DO_SETLINK_NOTIFY; 1627 } 1628 1629 if (tb[IFLA_ADDRESS]) { 1630 struct sockaddr *sa; 1631 int len; 1632 1633 len = sizeof(sa_family_t) + dev->addr_len; 1634 sa = kmalloc(len, GFP_KERNEL); 1635 if (!sa) { 1636 err = -ENOMEM; 1637 goto errout; 1638 } 1639 sa->sa_family = dev->type; 1640 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1641 dev->addr_len); 1642 err = dev_set_mac_address(dev, sa); 1643 kfree(sa); 1644 if (err) 1645 goto errout; 1646 status |= DO_SETLINK_MODIFIED; 1647 } 1648 1649 if (tb[IFLA_MTU]) { 1650 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1651 if (err < 0) 1652 goto errout; 1653 status |= DO_SETLINK_MODIFIED; 1654 } 1655 1656 if (tb[IFLA_GROUP]) { 1657 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1658 status |= DO_SETLINK_NOTIFY; 1659 } 1660 1661 /* 1662 * Interface selected by interface index but interface 1663 * name provided implies that a name change has been 1664 * requested. 1665 */ 1666 if (ifm->ifi_index > 0 && ifname[0]) { 1667 err = dev_change_name(dev, ifname); 1668 if (err < 0) 1669 goto errout; 1670 status |= DO_SETLINK_MODIFIED; 1671 } 1672 1673 if (tb[IFLA_IFALIAS]) { 1674 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1675 nla_len(tb[IFLA_IFALIAS])); 1676 if (err < 0) 1677 goto errout; 1678 status |= DO_SETLINK_NOTIFY; 1679 } 1680 1681 if (tb[IFLA_BROADCAST]) { 1682 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1683 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1684 } 1685 1686 if (ifm->ifi_flags || ifm->ifi_change) { 1687 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1688 if (err < 0) 1689 goto errout; 1690 } 1691 1692 if (tb[IFLA_MASTER]) { 1693 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1694 if (err) 1695 goto errout; 1696 status |= DO_SETLINK_MODIFIED; 1697 } 1698 1699 if (tb[IFLA_CARRIER]) { 1700 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1701 if (err) 1702 goto errout; 1703 status |= DO_SETLINK_MODIFIED; 1704 } 1705 1706 if (tb[IFLA_TXQLEN]) { 1707 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1708 1709 if (dev->tx_queue_len ^ value) 1710 status |= DO_SETLINK_NOTIFY; 1711 1712 dev->tx_queue_len = value; 1713 } 1714 1715 if (tb[IFLA_OPERSTATE]) 1716 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1717 1718 if (tb[IFLA_LINKMODE]) { 1719 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1720 1721 write_lock_bh(&dev_base_lock); 1722 if (dev->link_mode ^ value) 1723 status |= DO_SETLINK_NOTIFY; 1724 dev->link_mode = value; 1725 write_unlock_bh(&dev_base_lock); 1726 } 1727 1728 if (tb[IFLA_VFINFO_LIST]) { 1729 struct nlattr *attr; 1730 int rem; 1731 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1732 if (nla_type(attr) != IFLA_VF_INFO) { 1733 err = -EINVAL; 1734 goto errout; 1735 } 1736 err = do_setvfinfo(dev, attr); 1737 if (err < 0) 1738 goto errout; 1739 status |= DO_SETLINK_NOTIFY; 1740 } 1741 } 1742 err = 0; 1743 1744 if (tb[IFLA_VF_PORTS]) { 1745 struct nlattr *port[IFLA_PORT_MAX+1]; 1746 struct nlattr *attr; 1747 int vf; 1748 int rem; 1749 1750 err = -EOPNOTSUPP; 1751 if (!ops->ndo_set_vf_port) 1752 goto errout; 1753 1754 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1755 if (nla_type(attr) != IFLA_VF_PORT) 1756 continue; 1757 err = nla_parse_nested(port, IFLA_PORT_MAX, 1758 attr, ifla_port_policy); 1759 if (err < 0) 1760 goto errout; 1761 if (!port[IFLA_PORT_VF]) { 1762 err = -EOPNOTSUPP; 1763 goto errout; 1764 } 1765 vf = nla_get_u32(port[IFLA_PORT_VF]); 1766 err = ops->ndo_set_vf_port(dev, vf, port); 1767 if (err < 0) 1768 goto errout; 1769 status |= DO_SETLINK_NOTIFY; 1770 } 1771 } 1772 err = 0; 1773 1774 if (tb[IFLA_PORT_SELF]) { 1775 struct nlattr *port[IFLA_PORT_MAX+1]; 1776 1777 err = nla_parse_nested(port, IFLA_PORT_MAX, 1778 tb[IFLA_PORT_SELF], ifla_port_policy); 1779 if (err < 0) 1780 goto errout; 1781 1782 err = -EOPNOTSUPP; 1783 if (ops->ndo_set_vf_port) 1784 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1785 if (err < 0) 1786 goto errout; 1787 status |= DO_SETLINK_NOTIFY; 1788 } 1789 1790 if (tb[IFLA_AF_SPEC]) { 1791 struct nlattr *af; 1792 int rem; 1793 1794 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1795 const struct rtnl_af_ops *af_ops; 1796 1797 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1798 BUG(); 1799 1800 err = af_ops->set_link_af(dev, af); 1801 if (err < 0) 1802 goto errout; 1803 1804 status |= DO_SETLINK_NOTIFY; 1805 } 1806 } 1807 err = 0; 1808 1809 errout: 1810 if (status & DO_SETLINK_MODIFIED) { 1811 if (status & DO_SETLINK_NOTIFY) 1812 netdev_state_change(dev); 1813 1814 if (err < 0) 1815 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", 1816 dev->name); 1817 } 1818 1819 return err; 1820 } 1821 1822 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1823 { 1824 struct net *net = sock_net(skb->sk); 1825 struct ifinfomsg *ifm; 1826 struct net_device *dev; 1827 int err; 1828 struct nlattr *tb[IFLA_MAX+1]; 1829 char ifname[IFNAMSIZ]; 1830 1831 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1832 if (err < 0) 1833 goto errout; 1834 1835 if (tb[IFLA_IFNAME]) 1836 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1837 else 1838 ifname[0] = '\0'; 1839 1840 err = -EINVAL; 1841 ifm = nlmsg_data(nlh); 1842 if (ifm->ifi_index > 0) 1843 dev = __dev_get_by_index(net, ifm->ifi_index); 1844 else if (tb[IFLA_IFNAME]) 1845 dev = __dev_get_by_name(net, ifname); 1846 else 1847 goto errout; 1848 1849 if (dev == NULL) { 1850 err = -ENODEV; 1851 goto errout; 1852 } 1853 1854 err = validate_linkmsg(dev, tb); 1855 if (err < 0) 1856 goto errout; 1857 1858 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 1859 errout: 1860 return err; 1861 } 1862 1863 static int rtnl_group_dellink(const struct net *net, int group) 1864 { 1865 struct net_device *dev, *aux; 1866 LIST_HEAD(list_kill); 1867 bool found = false; 1868 1869 if (!group) 1870 return -EPERM; 1871 1872 for_each_netdev(net, dev) { 1873 if (dev->group == group) { 1874 const struct rtnl_link_ops *ops; 1875 1876 found = true; 1877 ops = dev->rtnl_link_ops; 1878 if (!ops || !ops->dellink) 1879 return -EOPNOTSUPP; 1880 } 1881 } 1882 1883 if (!found) 1884 return -ENODEV; 1885 1886 for_each_netdev_safe(net, dev, aux) { 1887 if (dev->group == group) { 1888 const struct rtnl_link_ops *ops; 1889 1890 ops = dev->rtnl_link_ops; 1891 ops->dellink(dev, &list_kill); 1892 } 1893 } 1894 unregister_netdevice_many(&list_kill); 1895 1896 return 0; 1897 } 1898 1899 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1900 { 1901 struct net *net = sock_net(skb->sk); 1902 const struct rtnl_link_ops *ops; 1903 struct net_device *dev; 1904 struct ifinfomsg *ifm; 1905 char ifname[IFNAMSIZ]; 1906 struct nlattr *tb[IFLA_MAX+1]; 1907 int err; 1908 LIST_HEAD(list_kill); 1909 1910 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1911 if (err < 0) 1912 return err; 1913 1914 if (tb[IFLA_IFNAME]) 1915 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1916 1917 ifm = nlmsg_data(nlh); 1918 if (ifm->ifi_index > 0) 1919 dev = __dev_get_by_index(net, ifm->ifi_index); 1920 else if (tb[IFLA_IFNAME]) 1921 dev = __dev_get_by_name(net, ifname); 1922 else if (tb[IFLA_GROUP]) 1923 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 1924 else 1925 return -EINVAL; 1926 1927 if (!dev) 1928 return -ENODEV; 1929 1930 ops = dev->rtnl_link_ops; 1931 if (!ops || !ops->dellink) 1932 return -EOPNOTSUPP; 1933 1934 ops->dellink(dev, &list_kill); 1935 unregister_netdevice_many(&list_kill); 1936 return 0; 1937 } 1938 1939 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1940 { 1941 unsigned int old_flags; 1942 int err; 1943 1944 old_flags = dev->flags; 1945 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1946 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1947 if (err < 0) 1948 return err; 1949 } 1950 1951 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1952 1953 __dev_notify_flags(dev, old_flags, ~0U); 1954 return 0; 1955 } 1956 EXPORT_SYMBOL(rtnl_configure_link); 1957 1958 struct net_device *rtnl_create_link(struct net *net, 1959 const char *ifname, unsigned char name_assign_type, 1960 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1961 { 1962 int err; 1963 struct net_device *dev; 1964 unsigned int num_tx_queues = 1; 1965 unsigned int num_rx_queues = 1; 1966 1967 if (tb[IFLA_NUM_TX_QUEUES]) 1968 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1969 else if (ops->get_num_tx_queues) 1970 num_tx_queues = ops->get_num_tx_queues(); 1971 1972 if (tb[IFLA_NUM_RX_QUEUES]) 1973 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1974 else if (ops->get_num_rx_queues) 1975 num_rx_queues = ops->get_num_rx_queues(); 1976 1977 err = -ENOMEM; 1978 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 1979 ops->setup, num_tx_queues, num_rx_queues); 1980 if (!dev) 1981 goto err; 1982 1983 dev_net_set(dev, net); 1984 dev->rtnl_link_ops = ops; 1985 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1986 1987 if (tb[IFLA_MTU]) 1988 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1989 if (tb[IFLA_ADDRESS]) { 1990 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1991 nla_len(tb[IFLA_ADDRESS])); 1992 dev->addr_assign_type = NET_ADDR_SET; 1993 } 1994 if (tb[IFLA_BROADCAST]) 1995 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1996 nla_len(tb[IFLA_BROADCAST])); 1997 if (tb[IFLA_TXQLEN]) 1998 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1999 if (tb[IFLA_OPERSTATE]) 2000 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2001 if (tb[IFLA_LINKMODE]) 2002 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2003 if (tb[IFLA_GROUP]) 2004 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2005 2006 return dev; 2007 2008 err: 2009 return ERR_PTR(err); 2010 } 2011 EXPORT_SYMBOL(rtnl_create_link); 2012 2013 static int rtnl_group_changelink(const struct sk_buff *skb, 2014 struct net *net, int group, 2015 struct ifinfomsg *ifm, 2016 struct nlattr **tb) 2017 { 2018 struct net_device *dev, *aux; 2019 int err; 2020 2021 for_each_netdev_safe(net, dev, aux) { 2022 if (dev->group == group) { 2023 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2024 if (err < 0) 2025 return err; 2026 } 2027 } 2028 2029 return 0; 2030 } 2031 2032 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2033 { 2034 struct net *net = sock_net(skb->sk); 2035 const struct rtnl_link_ops *ops; 2036 const struct rtnl_link_ops *m_ops = NULL; 2037 struct net_device *dev; 2038 struct net_device *master_dev = NULL; 2039 struct ifinfomsg *ifm; 2040 char kind[MODULE_NAME_LEN]; 2041 char ifname[IFNAMSIZ]; 2042 struct nlattr *tb[IFLA_MAX+1]; 2043 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2044 unsigned char name_assign_type = NET_NAME_USER; 2045 int err; 2046 2047 #ifdef CONFIG_MODULES 2048 replay: 2049 #endif 2050 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2051 if (err < 0) 2052 return err; 2053 2054 if (tb[IFLA_IFNAME]) 2055 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2056 else 2057 ifname[0] = '\0'; 2058 2059 ifm = nlmsg_data(nlh); 2060 if (ifm->ifi_index > 0) 2061 dev = __dev_get_by_index(net, ifm->ifi_index); 2062 else { 2063 if (ifname[0]) 2064 dev = __dev_get_by_name(net, ifname); 2065 else 2066 dev = NULL; 2067 } 2068 2069 if (dev) { 2070 master_dev = netdev_master_upper_dev_get(dev); 2071 if (master_dev) 2072 m_ops = master_dev->rtnl_link_ops; 2073 } 2074 2075 err = validate_linkmsg(dev, tb); 2076 if (err < 0) 2077 return err; 2078 2079 if (tb[IFLA_LINKINFO]) { 2080 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2081 tb[IFLA_LINKINFO], ifla_info_policy); 2082 if (err < 0) 2083 return err; 2084 } else 2085 memset(linkinfo, 0, sizeof(linkinfo)); 2086 2087 if (linkinfo[IFLA_INFO_KIND]) { 2088 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2089 ops = rtnl_link_ops_get(kind); 2090 } else { 2091 kind[0] = '\0'; 2092 ops = NULL; 2093 } 2094 2095 if (1) { 2096 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2097 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2098 struct nlattr **data = NULL; 2099 struct nlattr **slave_data = NULL; 2100 struct net *dest_net, *link_net = NULL; 2101 2102 if (ops) { 2103 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2104 err = nla_parse_nested(attr, ops->maxtype, 2105 linkinfo[IFLA_INFO_DATA], 2106 ops->policy); 2107 if (err < 0) 2108 return err; 2109 data = attr; 2110 } 2111 if (ops->validate) { 2112 err = ops->validate(tb, data); 2113 if (err < 0) 2114 return err; 2115 } 2116 } 2117 2118 if (m_ops) { 2119 if (m_ops->slave_maxtype && 2120 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2121 err = nla_parse_nested(slave_attr, 2122 m_ops->slave_maxtype, 2123 linkinfo[IFLA_INFO_SLAVE_DATA], 2124 m_ops->slave_policy); 2125 if (err < 0) 2126 return err; 2127 slave_data = slave_attr; 2128 } 2129 if (m_ops->slave_validate) { 2130 err = m_ops->slave_validate(tb, slave_data); 2131 if (err < 0) 2132 return err; 2133 } 2134 } 2135 2136 if (dev) { 2137 int status = 0; 2138 2139 if (nlh->nlmsg_flags & NLM_F_EXCL) 2140 return -EEXIST; 2141 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2142 return -EOPNOTSUPP; 2143 2144 if (linkinfo[IFLA_INFO_DATA]) { 2145 if (!ops || ops != dev->rtnl_link_ops || 2146 !ops->changelink) 2147 return -EOPNOTSUPP; 2148 2149 err = ops->changelink(dev, tb, data); 2150 if (err < 0) 2151 return err; 2152 status |= DO_SETLINK_NOTIFY; 2153 } 2154 2155 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2156 if (!m_ops || !m_ops->slave_changelink) 2157 return -EOPNOTSUPP; 2158 2159 err = m_ops->slave_changelink(master_dev, dev, 2160 tb, slave_data); 2161 if (err < 0) 2162 return err; 2163 status |= DO_SETLINK_NOTIFY; 2164 } 2165 2166 return do_setlink(skb, dev, ifm, tb, ifname, status); 2167 } 2168 2169 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2170 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2171 return rtnl_group_changelink(skb, net, 2172 nla_get_u32(tb[IFLA_GROUP]), 2173 ifm, tb); 2174 return -ENODEV; 2175 } 2176 2177 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2178 return -EOPNOTSUPP; 2179 2180 if (!ops) { 2181 #ifdef CONFIG_MODULES 2182 if (kind[0]) { 2183 __rtnl_unlock(); 2184 request_module("rtnl-link-%s", kind); 2185 rtnl_lock(); 2186 ops = rtnl_link_ops_get(kind); 2187 if (ops) 2188 goto replay; 2189 } 2190 #endif 2191 return -EOPNOTSUPP; 2192 } 2193 2194 if (!ops->setup) 2195 return -EOPNOTSUPP; 2196 2197 if (!ifname[0]) { 2198 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2199 name_assign_type = NET_NAME_ENUM; 2200 } 2201 2202 dest_net = rtnl_link_get_net(net, tb); 2203 if (IS_ERR(dest_net)) 2204 return PTR_ERR(dest_net); 2205 2206 err = -EPERM; 2207 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2208 goto out; 2209 2210 if (tb[IFLA_LINK_NETNSID]) { 2211 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2212 2213 link_net = get_net_ns_by_id(dest_net, id); 2214 if (!link_net) { 2215 err = -EINVAL; 2216 goto out; 2217 } 2218 err = -EPERM; 2219 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2220 goto out; 2221 } 2222 2223 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2224 name_assign_type, ops, tb); 2225 if (IS_ERR(dev)) { 2226 err = PTR_ERR(dev); 2227 goto out; 2228 } 2229 2230 dev->ifindex = ifm->ifi_index; 2231 2232 if (ops->newlink) { 2233 err = ops->newlink(link_net ? : net, dev, tb, data); 2234 /* Drivers should call free_netdev() in ->destructor 2235 * and unregister it on failure after registration 2236 * so that device could be finally freed in rtnl_unlock. 2237 */ 2238 if (err < 0) { 2239 /* If device is not registered at all, free it now */ 2240 if (dev->reg_state == NETREG_UNINITIALIZED) 2241 free_netdev(dev); 2242 goto out; 2243 } 2244 } else { 2245 err = register_netdevice(dev); 2246 if (err < 0) { 2247 free_netdev(dev); 2248 goto out; 2249 } 2250 } 2251 err = rtnl_configure_link(dev, ifm); 2252 if (err < 0) 2253 goto out_unregister; 2254 if (link_net) { 2255 err = dev_change_net_namespace(dev, dest_net, ifname); 2256 if (err < 0) 2257 goto out_unregister; 2258 } 2259 out: 2260 if (link_net) 2261 put_net(link_net); 2262 put_net(dest_net); 2263 return err; 2264 out_unregister: 2265 if (ops->newlink) { 2266 LIST_HEAD(list_kill); 2267 2268 ops->dellink(dev, &list_kill); 2269 unregister_netdevice_many(&list_kill); 2270 } else { 2271 unregister_netdevice(dev); 2272 } 2273 goto out; 2274 } 2275 } 2276 2277 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2278 { 2279 struct net *net = sock_net(skb->sk); 2280 struct ifinfomsg *ifm; 2281 char ifname[IFNAMSIZ]; 2282 struct nlattr *tb[IFLA_MAX+1]; 2283 struct net_device *dev = NULL; 2284 struct sk_buff *nskb; 2285 int err; 2286 u32 ext_filter_mask = 0; 2287 2288 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2289 if (err < 0) 2290 return err; 2291 2292 if (tb[IFLA_IFNAME]) 2293 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2294 2295 if (tb[IFLA_EXT_MASK]) 2296 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2297 2298 ifm = nlmsg_data(nlh); 2299 if (ifm->ifi_index > 0) 2300 dev = __dev_get_by_index(net, ifm->ifi_index); 2301 else if (tb[IFLA_IFNAME]) 2302 dev = __dev_get_by_name(net, ifname); 2303 else 2304 return -EINVAL; 2305 2306 if (dev == NULL) 2307 return -ENODEV; 2308 2309 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2310 if (nskb == NULL) 2311 return -ENOBUFS; 2312 2313 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2314 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2315 if (err < 0) { 2316 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2317 WARN_ON(err == -EMSGSIZE); 2318 kfree_skb(nskb); 2319 } else 2320 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2321 2322 return err; 2323 } 2324 2325 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2326 { 2327 struct net *net = sock_net(skb->sk); 2328 struct net_device *dev; 2329 struct nlattr *tb[IFLA_MAX+1]; 2330 u32 ext_filter_mask = 0; 2331 u16 min_ifinfo_dump_size = 0; 2332 int hdrlen; 2333 2334 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2335 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2336 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2337 2338 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2339 if (tb[IFLA_EXT_MASK]) 2340 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2341 } 2342 2343 if (!ext_filter_mask) 2344 return NLMSG_GOODSIZE; 2345 /* 2346 * traverse the list of net devices and compute the minimum 2347 * buffer size based upon the filter mask. 2348 */ 2349 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2350 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2351 if_nlmsg_size(dev, 2352 ext_filter_mask)); 2353 } 2354 2355 return min_ifinfo_dump_size; 2356 } 2357 2358 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2359 { 2360 int idx; 2361 int s_idx = cb->family; 2362 2363 if (s_idx == 0) 2364 s_idx = 1; 2365 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2366 int type = cb->nlh->nlmsg_type-RTM_BASE; 2367 if (idx < s_idx || idx == PF_PACKET) 2368 continue; 2369 if (rtnl_msg_handlers[idx] == NULL || 2370 rtnl_msg_handlers[idx][type].dumpit == NULL) 2371 continue; 2372 if (idx > s_idx) { 2373 memset(&cb->args[0], 0, sizeof(cb->args)); 2374 cb->prev_seq = 0; 2375 cb->seq = 0; 2376 } 2377 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2378 break; 2379 } 2380 cb->family = idx; 2381 2382 return skb->len; 2383 } 2384 2385 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2386 unsigned int change, gfp_t flags) 2387 { 2388 struct net *net = dev_net(dev); 2389 struct sk_buff *skb; 2390 int err = -ENOBUFS; 2391 size_t if_info_size; 2392 2393 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2394 if (skb == NULL) 2395 goto errout; 2396 2397 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2398 if (err < 0) { 2399 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2400 WARN_ON(err == -EMSGSIZE); 2401 kfree_skb(skb); 2402 goto errout; 2403 } 2404 return skb; 2405 errout: 2406 if (err < 0) 2407 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2408 return NULL; 2409 } 2410 2411 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2412 { 2413 struct net *net = dev_net(dev); 2414 2415 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2416 } 2417 2418 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2419 gfp_t flags) 2420 { 2421 struct sk_buff *skb; 2422 2423 if (dev->reg_state != NETREG_REGISTERED) 2424 return; 2425 2426 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2427 if (skb) 2428 rtmsg_ifinfo_send(skb, dev, flags); 2429 } 2430 EXPORT_SYMBOL(rtmsg_ifinfo); 2431 2432 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2433 struct net_device *dev, 2434 u8 *addr, u16 vid, u32 pid, u32 seq, 2435 int type, unsigned int flags, 2436 int nlflags) 2437 { 2438 struct nlmsghdr *nlh; 2439 struct ndmsg *ndm; 2440 2441 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2442 if (!nlh) 2443 return -EMSGSIZE; 2444 2445 ndm = nlmsg_data(nlh); 2446 ndm->ndm_family = AF_BRIDGE; 2447 ndm->ndm_pad1 = 0; 2448 ndm->ndm_pad2 = 0; 2449 ndm->ndm_flags = flags; 2450 ndm->ndm_type = 0; 2451 ndm->ndm_ifindex = dev->ifindex; 2452 ndm->ndm_state = NUD_PERMANENT; 2453 2454 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2455 goto nla_put_failure; 2456 if (vid) 2457 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2458 goto nla_put_failure; 2459 2460 nlmsg_end(skb, nlh); 2461 return 0; 2462 2463 nla_put_failure: 2464 nlmsg_cancel(skb, nlh); 2465 return -EMSGSIZE; 2466 } 2467 2468 static inline size_t rtnl_fdb_nlmsg_size(void) 2469 { 2470 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2471 } 2472 2473 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type) 2474 { 2475 struct net *net = dev_net(dev); 2476 struct sk_buff *skb; 2477 int err = -ENOBUFS; 2478 2479 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2480 if (!skb) 2481 goto errout; 2482 2483 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2484 0, 0, type, NTF_SELF, 0); 2485 if (err < 0) { 2486 kfree_skb(skb); 2487 goto errout; 2488 } 2489 2490 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2491 return; 2492 errout: 2493 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2494 } 2495 2496 /** 2497 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2498 */ 2499 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2500 struct nlattr *tb[], 2501 struct net_device *dev, 2502 const unsigned char *addr, u16 vid, 2503 u16 flags) 2504 { 2505 int err = -EINVAL; 2506 2507 /* If aging addresses are supported device will need to 2508 * implement its own handler for this. 2509 */ 2510 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2511 pr_info("%s: FDB only supports static addresses\n", dev->name); 2512 return err; 2513 } 2514 2515 if (vid) { 2516 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2517 return err; 2518 } 2519 2520 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2521 err = dev_uc_add_excl(dev, addr); 2522 else if (is_multicast_ether_addr(addr)) 2523 err = dev_mc_add_excl(dev, addr); 2524 2525 /* Only return duplicate errors if NLM_F_EXCL is set */ 2526 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2527 err = 0; 2528 2529 return err; 2530 } 2531 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2532 2533 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2534 { 2535 u16 vid = 0; 2536 2537 if (vlan_attr) { 2538 if (nla_len(vlan_attr) != sizeof(u16)) { 2539 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2540 return -EINVAL; 2541 } 2542 2543 vid = nla_get_u16(vlan_attr); 2544 2545 if (!vid || vid >= VLAN_VID_MASK) { 2546 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2547 vid); 2548 return -EINVAL; 2549 } 2550 } 2551 *p_vid = vid; 2552 return 0; 2553 } 2554 2555 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2556 { 2557 struct net *net = sock_net(skb->sk); 2558 struct ndmsg *ndm; 2559 struct nlattr *tb[NDA_MAX+1]; 2560 struct net_device *dev; 2561 u8 *addr; 2562 u16 vid; 2563 int err; 2564 2565 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2566 if (err < 0) 2567 return err; 2568 2569 ndm = nlmsg_data(nlh); 2570 if (ndm->ndm_ifindex == 0) { 2571 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2572 return -EINVAL; 2573 } 2574 2575 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2576 if (dev == NULL) { 2577 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2578 return -ENODEV; 2579 } 2580 2581 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2582 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2583 return -EINVAL; 2584 } 2585 2586 addr = nla_data(tb[NDA_LLADDR]); 2587 2588 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2589 if (err) 2590 return err; 2591 2592 err = -EOPNOTSUPP; 2593 2594 /* Support fdb on master device the net/bridge default case */ 2595 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2596 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2597 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2598 const struct net_device_ops *ops = br_dev->netdev_ops; 2599 2600 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2601 nlh->nlmsg_flags); 2602 if (err) 2603 goto out; 2604 else 2605 ndm->ndm_flags &= ~NTF_MASTER; 2606 } 2607 2608 /* Embedded bridge, macvlan, and any other device support */ 2609 if ((ndm->ndm_flags & NTF_SELF)) { 2610 if (dev->netdev_ops->ndo_fdb_add) 2611 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2612 vid, 2613 nlh->nlmsg_flags); 2614 else 2615 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 2616 nlh->nlmsg_flags); 2617 2618 if (!err) { 2619 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH); 2620 ndm->ndm_flags &= ~NTF_SELF; 2621 } 2622 } 2623 out: 2624 return err; 2625 } 2626 2627 /** 2628 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2629 */ 2630 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2631 struct nlattr *tb[], 2632 struct net_device *dev, 2633 const unsigned char *addr, u16 vid) 2634 { 2635 int err = -EINVAL; 2636 2637 /* If aging addresses are supported device will need to 2638 * implement its own handler for this. 2639 */ 2640 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2641 pr_info("%s: FDB only supports static addresses\n", dev->name); 2642 return err; 2643 } 2644 2645 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2646 err = dev_uc_del(dev, addr); 2647 else if (is_multicast_ether_addr(addr)) 2648 err = dev_mc_del(dev, addr); 2649 2650 return err; 2651 } 2652 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2653 2654 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2655 { 2656 struct net *net = sock_net(skb->sk); 2657 struct ndmsg *ndm; 2658 struct nlattr *tb[NDA_MAX+1]; 2659 struct net_device *dev; 2660 int err = -EINVAL; 2661 __u8 *addr; 2662 u16 vid; 2663 2664 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2665 return -EPERM; 2666 2667 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2668 if (err < 0) 2669 return err; 2670 2671 ndm = nlmsg_data(nlh); 2672 if (ndm->ndm_ifindex == 0) { 2673 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2674 return -EINVAL; 2675 } 2676 2677 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2678 if (dev == NULL) { 2679 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2680 return -ENODEV; 2681 } 2682 2683 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2684 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2685 return -EINVAL; 2686 } 2687 2688 addr = nla_data(tb[NDA_LLADDR]); 2689 2690 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2691 if (err) 2692 return err; 2693 2694 err = -EOPNOTSUPP; 2695 2696 /* Support fdb on master device the net/bridge default case */ 2697 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2698 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2699 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2700 const struct net_device_ops *ops = br_dev->netdev_ops; 2701 2702 if (ops->ndo_fdb_del) 2703 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 2704 2705 if (err) 2706 goto out; 2707 else 2708 ndm->ndm_flags &= ~NTF_MASTER; 2709 } 2710 2711 /* Embedded bridge, macvlan, and any other device support */ 2712 if (ndm->ndm_flags & NTF_SELF) { 2713 if (dev->netdev_ops->ndo_fdb_del) 2714 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 2715 vid); 2716 else 2717 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 2718 2719 if (!err) { 2720 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH); 2721 ndm->ndm_flags &= ~NTF_SELF; 2722 } 2723 } 2724 out: 2725 return err; 2726 } 2727 2728 static int nlmsg_populate_fdb(struct sk_buff *skb, 2729 struct netlink_callback *cb, 2730 struct net_device *dev, 2731 int *idx, 2732 struct netdev_hw_addr_list *list) 2733 { 2734 struct netdev_hw_addr *ha; 2735 int err; 2736 u32 portid, seq; 2737 2738 portid = NETLINK_CB(cb->skb).portid; 2739 seq = cb->nlh->nlmsg_seq; 2740 2741 list_for_each_entry(ha, &list->list, list) { 2742 if (*idx < cb->args[0]) 2743 goto skip; 2744 2745 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 2746 portid, seq, 2747 RTM_NEWNEIGH, NTF_SELF, 2748 NLM_F_MULTI); 2749 if (err < 0) 2750 return err; 2751 skip: 2752 *idx += 1; 2753 } 2754 return 0; 2755 } 2756 2757 /** 2758 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2759 * @nlh: netlink message header 2760 * @dev: netdevice 2761 * 2762 * Default netdevice operation to dump the existing unicast address list. 2763 * Returns number of addresses from list put in skb. 2764 */ 2765 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2766 struct netlink_callback *cb, 2767 struct net_device *dev, 2768 struct net_device *filter_dev, 2769 int idx) 2770 { 2771 int err; 2772 2773 netif_addr_lock_bh(dev); 2774 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2775 if (err) 2776 goto out; 2777 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2778 out: 2779 netif_addr_unlock_bh(dev); 2780 return idx; 2781 } 2782 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2783 2784 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2785 { 2786 struct net_device *dev; 2787 struct nlattr *tb[IFLA_MAX+1]; 2788 struct net_device *br_dev = NULL; 2789 const struct net_device_ops *ops = NULL; 2790 const struct net_device_ops *cops = NULL; 2791 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2792 struct net *net = sock_net(skb->sk); 2793 int brport_idx = 0; 2794 int br_idx = 0; 2795 int idx = 0; 2796 2797 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 2798 ifla_policy) == 0) { 2799 if (tb[IFLA_MASTER]) 2800 br_idx = nla_get_u32(tb[IFLA_MASTER]); 2801 } 2802 2803 brport_idx = ifm->ifi_index; 2804 2805 if (br_idx) { 2806 br_dev = __dev_get_by_index(net, br_idx); 2807 if (!br_dev) 2808 return -ENODEV; 2809 2810 ops = br_dev->netdev_ops; 2811 } 2812 2813 for_each_netdev(net, dev) { 2814 if (brport_idx && (dev->ifindex != brport_idx)) 2815 continue; 2816 2817 if (!br_idx) { /* user did not specify a specific bridge */ 2818 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2819 br_dev = netdev_master_upper_dev_get(dev); 2820 cops = br_dev->netdev_ops; 2821 } 2822 2823 } else { 2824 if (dev != br_dev && 2825 !(dev->priv_flags & IFF_BRIDGE_PORT)) 2826 continue; 2827 2828 if (br_dev != netdev_master_upper_dev_get(dev) && 2829 !(dev->priv_flags & IFF_EBRIDGE)) 2830 continue; 2831 2832 cops = ops; 2833 } 2834 2835 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2836 if (cops && cops->ndo_fdb_dump) 2837 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 2838 idx); 2839 } 2840 2841 if (dev->netdev_ops->ndo_fdb_dump) 2842 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL, 2843 idx); 2844 else 2845 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 2846 2847 cops = NULL; 2848 } 2849 2850 cb->args[0] = idx; 2851 return skb->len; 2852 } 2853 2854 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 2855 unsigned int attrnum, unsigned int flag) 2856 { 2857 if (mask & flag) 2858 return nla_put_u8(skb, attrnum, !!(flags & flag)); 2859 return 0; 2860 } 2861 2862 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2863 struct net_device *dev, u16 mode, 2864 u32 flags, u32 mask, int nlflags) 2865 { 2866 struct nlmsghdr *nlh; 2867 struct ifinfomsg *ifm; 2868 struct nlattr *br_afspec; 2869 struct nlattr *protinfo; 2870 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2871 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2872 2873 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 2874 if (nlh == NULL) 2875 return -EMSGSIZE; 2876 2877 ifm = nlmsg_data(nlh); 2878 ifm->ifi_family = AF_BRIDGE; 2879 ifm->__ifi_pad = 0; 2880 ifm->ifi_type = dev->type; 2881 ifm->ifi_index = dev->ifindex; 2882 ifm->ifi_flags = dev_get_flags(dev); 2883 ifm->ifi_change = 0; 2884 2885 2886 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2887 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2888 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2889 (br_dev && 2890 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2891 (dev->addr_len && 2892 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2893 (dev->ifindex != dev_get_iflink(dev) && 2894 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 2895 goto nla_put_failure; 2896 2897 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2898 if (!br_afspec) 2899 goto nla_put_failure; 2900 2901 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 2902 nla_nest_cancel(skb, br_afspec); 2903 goto nla_put_failure; 2904 } 2905 2906 if (mode != BRIDGE_MODE_UNDEF) { 2907 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2908 nla_nest_cancel(skb, br_afspec); 2909 goto nla_put_failure; 2910 } 2911 } 2912 nla_nest_end(skb, br_afspec); 2913 2914 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 2915 if (!protinfo) 2916 goto nla_put_failure; 2917 2918 if (brport_nla_put_flag(skb, flags, mask, 2919 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 2920 brport_nla_put_flag(skb, flags, mask, 2921 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 2922 brport_nla_put_flag(skb, flags, mask, 2923 IFLA_BRPORT_FAST_LEAVE, 2924 BR_MULTICAST_FAST_LEAVE) || 2925 brport_nla_put_flag(skb, flags, mask, 2926 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 2927 brport_nla_put_flag(skb, flags, mask, 2928 IFLA_BRPORT_LEARNING, BR_LEARNING) || 2929 brport_nla_put_flag(skb, flags, mask, 2930 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 2931 brport_nla_put_flag(skb, flags, mask, 2932 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 2933 brport_nla_put_flag(skb, flags, mask, 2934 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 2935 nla_nest_cancel(skb, protinfo); 2936 goto nla_put_failure; 2937 } 2938 2939 nla_nest_end(skb, protinfo); 2940 2941 nlmsg_end(skb, nlh); 2942 return 0; 2943 nla_put_failure: 2944 nlmsg_cancel(skb, nlh); 2945 return -EMSGSIZE; 2946 } 2947 EXPORT_SYMBOL(ndo_dflt_bridge_getlink); 2948 2949 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 2950 { 2951 struct net *net = sock_net(skb->sk); 2952 struct net_device *dev; 2953 int idx = 0; 2954 u32 portid = NETLINK_CB(cb->skb).portid; 2955 u32 seq = cb->nlh->nlmsg_seq; 2956 u32 filter_mask = 0; 2957 2958 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 2959 struct nlattr *extfilt; 2960 2961 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 2962 IFLA_EXT_MASK); 2963 if (extfilt) { 2964 if (nla_len(extfilt) < sizeof(filter_mask)) 2965 return -EINVAL; 2966 2967 filter_mask = nla_get_u32(extfilt); 2968 } 2969 } 2970 2971 rcu_read_lock(); 2972 for_each_netdev_rcu(net, dev) { 2973 const struct net_device_ops *ops = dev->netdev_ops; 2974 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2975 2976 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2977 if (idx >= cb->args[0] && 2978 br_dev->netdev_ops->ndo_bridge_getlink( 2979 skb, portid, seq, dev, filter_mask, 2980 NLM_F_MULTI) < 0) 2981 break; 2982 idx++; 2983 } 2984 2985 if (ops->ndo_bridge_getlink) { 2986 if (idx >= cb->args[0] && 2987 ops->ndo_bridge_getlink(skb, portid, seq, dev, 2988 filter_mask, 2989 NLM_F_MULTI) < 0) 2990 break; 2991 idx++; 2992 } 2993 } 2994 rcu_read_unlock(); 2995 cb->args[0] = idx; 2996 2997 return skb->len; 2998 } 2999 3000 static inline size_t bridge_nlmsg_size(void) 3001 { 3002 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3003 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3004 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3005 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3006 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3007 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3008 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3009 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3010 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3011 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3012 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3013 } 3014 3015 static int rtnl_bridge_notify(struct net_device *dev) 3016 { 3017 struct net *net = dev_net(dev); 3018 struct sk_buff *skb; 3019 int err = -EOPNOTSUPP; 3020 3021 if (!dev->netdev_ops->ndo_bridge_getlink) 3022 return 0; 3023 3024 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3025 if (!skb) { 3026 err = -ENOMEM; 3027 goto errout; 3028 } 3029 3030 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3031 if (err < 0) 3032 goto errout; 3033 3034 if (!skb->len) 3035 goto errout; 3036 3037 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3038 return 0; 3039 errout: 3040 WARN_ON(err == -EMSGSIZE); 3041 kfree_skb(skb); 3042 if (err) 3043 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3044 return err; 3045 } 3046 3047 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3048 { 3049 struct net *net = sock_net(skb->sk); 3050 struct ifinfomsg *ifm; 3051 struct net_device *dev; 3052 struct nlattr *br_spec, *attr = NULL; 3053 int rem, err = -EOPNOTSUPP; 3054 u16 flags = 0; 3055 bool have_flags = false; 3056 3057 if (nlmsg_len(nlh) < sizeof(*ifm)) 3058 return -EINVAL; 3059 3060 ifm = nlmsg_data(nlh); 3061 if (ifm->ifi_family != AF_BRIDGE) 3062 return -EPFNOSUPPORT; 3063 3064 dev = __dev_get_by_index(net, ifm->ifi_index); 3065 if (!dev) { 3066 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3067 return -ENODEV; 3068 } 3069 3070 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3071 if (br_spec) { 3072 nla_for_each_nested(attr, br_spec, rem) { 3073 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3074 if (nla_len(attr) < sizeof(flags)) 3075 return -EINVAL; 3076 3077 have_flags = true; 3078 flags = nla_get_u16(attr); 3079 break; 3080 } 3081 } 3082 } 3083 3084 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3085 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3086 3087 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3088 err = -EOPNOTSUPP; 3089 goto out; 3090 } 3091 3092 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3093 if (err) 3094 goto out; 3095 3096 flags &= ~BRIDGE_FLAGS_MASTER; 3097 } 3098 3099 if ((flags & BRIDGE_FLAGS_SELF)) { 3100 if (!dev->netdev_ops->ndo_bridge_setlink) 3101 err = -EOPNOTSUPP; 3102 else 3103 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3104 flags); 3105 if (!err) { 3106 flags &= ~BRIDGE_FLAGS_SELF; 3107 3108 /* Generate event to notify upper layer of bridge 3109 * change 3110 */ 3111 err = rtnl_bridge_notify(dev); 3112 } 3113 } 3114 3115 if (have_flags) 3116 memcpy(nla_data(attr), &flags, sizeof(flags)); 3117 out: 3118 return err; 3119 } 3120 3121 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3122 { 3123 struct net *net = sock_net(skb->sk); 3124 struct ifinfomsg *ifm; 3125 struct net_device *dev; 3126 struct nlattr *br_spec, *attr = NULL; 3127 int rem, err = -EOPNOTSUPP; 3128 u16 flags = 0; 3129 bool have_flags = false; 3130 3131 if (nlmsg_len(nlh) < sizeof(*ifm)) 3132 return -EINVAL; 3133 3134 ifm = nlmsg_data(nlh); 3135 if (ifm->ifi_family != AF_BRIDGE) 3136 return -EPFNOSUPPORT; 3137 3138 dev = __dev_get_by_index(net, ifm->ifi_index); 3139 if (!dev) { 3140 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3141 return -ENODEV; 3142 } 3143 3144 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3145 if (br_spec) { 3146 nla_for_each_nested(attr, br_spec, rem) { 3147 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3148 if (nla_len(attr) < sizeof(flags)) 3149 return -EINVAL; 3150 3151 have_flags = true; 3152 flags = nla_get_u16(attr); 3153 break; 3154 } 3155 } 3156 } 3157 3158 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3159 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3160 3161 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3162 err = -EOPNOTSUPP; 3163 goto out; 3164 } 3165 3166 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3167 if (err) 3168 goto out; 3169 3170 flags &= ~BRIDGE_FLAGS_MASTER; 3171 } 3172 3173 if ((flags & BRIDGE_FLAGS_SELF)) { 3174 if (!dev->netdev_ops->ndo_bridge_dellink) 3175 err = -EOPNOTSUPP; 3176 else 3177 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3178 flags); 3179 3180 if (!err) { 3181 flags &= ~BRIDGE_FLAGS_SELF; 3182 3183 /* Generate event to notify upper layer of bridge 3184 * change 3185 */ 3186 err = rtnl_bridge_notify(dev); 3187 } 3188 } 3189 3190 if (have_flags) 3191 memcpy(nla_data(attr), &flags, sizeof(flags)); 3192 out: 3193 return err; 3194 } 3195 3196 /* Process one rtnetlink message. */ 3197 3198 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3199 { 3200 struct net *net = sock_net(skb->sk); 3201 rtnl_doit_func doit; 3202 int sz_idx, kind; 3203 int family; 3204 int type; 3205 int err; 3206 3207 type = nlh->nlmsg_type; 3208 if (type > RTM_MAX) 3209 return -EOPNOTSUPP; 3210 3211 type -= RTM_BASE; 3212 3213 /* All the messages must have at least 1 byte length */ 3214 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3215 return 0; 3216 3217 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3218 sz_idx = type>>2; 3219 kind = type&3; 3220 3221 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3222 return -EPERM; 3223 3224 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 3225 struct sock *rtnl; 3226 rtnl_dumpit_func dumpit; 3227 rtnl_calcit_func calcit; 3228 u16 min_dump_alloc = 0; 3229 3230 dumpit = rtnl_get_dumpit(family, type); 3231 if (dumpit == NULL) 3232 return -EOPNOTSUPP; 3233 calcit = rtnl_get_calcit(family, type); 3234 if (calcit) 3235 min_dump_alloc = calcit(skb, nlh); 3236 3237 __rtnl_unlock(); 3238 rtnl = net->rtnl; 3239 { 3240 struct netlink_dump_control c = { 3241 .dump = dumpit, 3242 .min_dump_alloc = min_dump_alloc, 3243 }; 3244 err = netlink_dump_start(rtnl, skb, nlh, &c); 3245 } 3246 rtnl_lock(); 3247 return err; 3248 } 3249 3250 doit = rtnl_get_doit(family, type); 3251 if (doit == NULL) 3252 return -EOPNOTSUPP; 3253 3254 return doit(skb, nlh); 3255 } 3256 3257 static void rtnetlink_rcv(struct sk_buff *skb) 3258 { 3259 rtnl_lock(); 3260 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 3261 rtnl_unlock(); 3262 } 3263 3264 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 3265 { 3266 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3267 3268 switch (event) { 3269 case NETDEV_UP: 3270 case NETDEV_DOWN: 3271 case NETDEV_PRE_UP: 3272 case NETDEV_POST_INIT: 3273 case NETDEV_REGISTER: 3274 case NETDEV_CHANGE: 3275 case NETDEV_PRE_TYPE_CHANGE: 3276 case NETDEV_GOING_DOWN: 3277 case NETDEV_UNREGISTER: 3278 case NETDEV_UNREGISTER_FINAL: 3279 case NETDEV_RELEASE: 3280 case NETDEV_JOIN: 3281 case NETDEV_BONDING_INFO: 3282 break; 3283 default: 3284 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3285 break; 3286 } 3287 return NOTIFY_DONE; 3288 } 3289 3290 static struct notifier_block rtnetlink_dev_notifier = { 3291 .notifier_call = rtnetlink_event, 3292 }; 3293 3294 3295 static int __net_init rtnetlink_net_init(struct net *net) 3296 { 3297 struct sock *sk; 3298 struct netlink_kernel_cfg cfg = { 3299 .groups = RTNLGRP_MAX, 3300 .input = rtnetlink_rcv, 3301 .cb_mutex = &rtnl_mutex, 3302 .flags = NL_CFG_F_NONROOT_RECV, 3303 }; 3304 3305 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3306 if (!sk) 3307 return -ENOMEM; 3308 net->rtnl = sk; 3309 return 0; 3310 } 3311 3312 static void __net_exit rtnetlink_net_exit(struct net *net) 3313 { 3314 netlink_kernel_release(net->rtnl); 3315 net->rtnl = NULL; 3316 } 3317 3318 static struct pernet_operations rtnetlink_net_ops = { 3319 .init = rtnetlink_net_init, 3320 .exit = rtnetlink_net_exit, 3321 }; 3322 3323 void __init rtnetlink_init(void) 3324 { 3325 if (register_pernet_subsys(&rtnetlink_net_ops)) 3326 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3327 3328 register_netdevice_notifier(&rtnetlink_dev_notifier); 3329 3330 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3331 rtnl_dump_ifinfo, rtnl_calcit); 3332 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3333 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3334 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3335 3336 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3337 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3338 3339 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3340 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3341 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3342 3343 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3344 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3345 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3346 } 3347 3348