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 bool 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 u32 ext_filter_mask) 502 { 503 struct rtnl_af_ops *af_ops; 504 size_t size; 505 506 /* IFLA_AF_SPEC */ 507 size = nla_total_size(sizeof(struct nlattr)); 508 509 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 510 if (af_ops->get_link_af_size) { 511 /* AF_* + nested data */ 512 size += nla_total_size(sizeof(struct nlattr)) + 513 af_ops->get_link_af_size(dev, ext_filter_mask); 514 } 515 } 516 517 return size; 518 } 519 520 static bool rtnl_have_link_slave_info(const struct net_device *dev) 521 { 522 struct net_device *master_dev; 523 524 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 525 if (master_dev && master_dev->rtnl_link_ops) 526 return true; 527 return false; 528 } 529 530 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 531 const struct net_device *dev) 532 { 533 struct net_device *master_dev; 534 const struct rtnl_link_ops *ops; 535 struct nlattr *slave_data; 536 int err; 537 538 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 539 if (!master_dev) 540 return 0; 541 ops = master_dev->rtnl_link_ops; 542 if (!ops) 543 return 0; 544 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 545 return -EMSGSIZE; 546 if (ops->fill_slave_info) { 547 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA); 548 if (!slave_data) 549 return -EMSGSIZE; 550 err = ops->fill_slave_info(skb, master_dev, dev); 551 if (err < 0) 552 goto err_cancel_slave_data; 553 nla_nest_end(skb, slave_data); 554 } 555 return 0; 556 557 err_cancel_slave_data: 558 nla_nest_cancel(skb, slave_data); 559 return err; 560 } 561 562 static int rtnl_link_info_fill(struct sk_buff *skb, 563 const struct net_device *dev) 564 { 565 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 566 struct nlattr *data; 567 int err; 568 569 if (!ops) 570 return 0; 571 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 572 return -EMSGSIZE; 573 if (ops->fill_xstats) { 574 err = ops->fill_xstats(skb, dev); 575 if (err < 0) 576 return err; 577 } 578 if (ops->fill_info) { 579 data = nla_nest_start(skb, IFLA_INFO_DATA); 580 if (data == NULL) 581 return -EMSGSIZE; 582 err = ops->fill_info(skb, dev); 583 if (err < 0) 584 goto err_cancel_data; 585 nla_nest_end(skb, data); 586 } 587 return 0; 588 589 err_cancel_data: 590 nla_nest_cancel(skb, data); 591 return err; 592 } 593 594 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 595 { 596 struct nlattr *linkinfo; 597 int err = -EMSGSIZE; 598 599 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 600 if (linkinfo == NULL) 601 goto out; 602 603 err = rtnl_link_info_fill(skb, dev); 604 if (err < 0) 605 goto err_cancel_link; 606 607 err = rtnl_link_slave_info_fill(skb, dev); 608 if (err < 0) 609 goto err_cancel_link; 610 611 nla_nest_end(skb, linkinfo); 612 return 0; 613 614 err_cancel_link: 615 nla_nest_cancel(skb, linkinfo); 616 out: 617 return err; 618 } 619 620 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 621 { 622 struct sock *rtnl = net->rtnl; 623 int err = 0; 624 625 NETLINK_CB(skb).dst_group = group; 626 if (echo) 627 atomic_inc(&skb->users); 628 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 629 if (echo) 630 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 631 return err; 632 } 633 634 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 635 { 636 struct sock *rtnl = net->rtnl; 637 638 return nlmsg_unicast(rtnl, skb, pid); 639 } 640 EXPORT_SYMBOL(rtnl_unicast); 641 642 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 643 struct nlmsghdr *nlh, gfp_t flags) 644 { 645 struct sock *rtnl = net->rtnl; 646 int report = 0; 647 648 if (nlh) 649 report = nlmsg_report(nlh); 650 651 nlmsg_notify(rtnl, skb, pid, group, report, flags); 652 } 653 EXPORT_SYMBOL(rtnl_notify); 654 655 void rtnl_set_sk_err(struct net *net, u32 group, int error) 656 { 657 struct sock *rtnl = net->rtnl; 658 659 netlink_set_err(rtnl, 0, group, error); 660 } 661 EXPORT_SYMBOL(rtnl_set_sk_err); 662 663 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 664 { 665 struct nlattr *mx; 666 int i, valid = 0; 667 668 mx = nla_nest_start(skb, RTA_METRICS); 669 if (mx == NULL) 670 return -ENOBUFS; 671 672 for (i = 0; i < RTAX_MAX; i++) { 673 if (metrics[i]) { 674 if (i == RTAX_CC_ALGO - 1) { 675 char tmp[TCP_CA_NAME_MAX], *name; 676 677 name = tcp_ca_get_name_by_key(metrics[i], tmp); 678 if (!name) 679 continue; 680 if (nla_put_string(skb, i + 1, name)) 681 goto nla_put_failure; 682 } else if (i == RTAX_FEATURES - 1) { 683 u32 user_features = metrics[i] & RTAX_FEATURE_MASK; 684 685 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); 686 if (nla_put_u32(skb, i + 1, user_features)) 687 goto nla_put_failure; 688 } else { 689 if (nla_put_u32(skb, i + 1, metrics[i])) 690 goto nla_put_failure; 691 } 692 valid++; 693 } 694 } 695 696 if (!valid) { 697 nla_nest_cancel(skb, mx); 698 return 0; 699 } 700 701 return nla_nest_end(skb, mx); 702 703 nla_put_failure: 704 nla_nest_cancel(skb, mx); 705 return -EMSGSIZE; 706 } 707 EXPORT_SYMBOL(rtnetlink_put_metrics); 708 709 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 710 long expires, u32 error) 711 { 712 struct rta_cacheinfo ci = { 713 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 714 .rta_used = dst->__use, 715 .rta_clntref = atomic_read(&(dst->__refcnt)), 716 .rta_error = error, 717 .rta_id = id, 718 }; 719 720 if (expires) { 721 unsigned long clock; 722 723 clock = jiffies_to_clock_t(abs(expires)); 724 clock = min_t(unsigned long, clock, INT_MAX); 725 ci.rta_expires = (expires > 0) ? clock : -clock; 726 } 727 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 728 } 729 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 730 731 static void set_operstate(struct net_device *dev, unsigned char transition) 732 { 733 unsigned char operstate = dev->operstate; 734 735 switch (transition) { 736 case IF_OPER_UP: 737 if ((operstate == IF_OPER_DORMANT || 738 operstate == IF_OPER_UNKNOWN) && 739 !netif_dormant(dev)) 740 operstate = IF_OPER_UP; 741 break; 742 743 case IF_OPER_DORMANT: 744 if (operstate == IF_OPER_UP || 745 operstate == IF_OPER_UNKNOWN) 746 operstate = IF_OPER_DORMANT; 747 break; 748 } 749 750 if (dev->operstate != operstate) { 751 write_lock_bh(&dev_base_lock); 752 dev->operstate = operstate; 753 write_unlock_bh(&dev_base_lock); 754 netdev_state_change(dev); 755 } 756 } 757 758 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 759 { 760 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 761 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 762 } 763 764 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 765 const struct ifinfomsg *ifm) 766 { 767 unsigned int flags = ifm->ifi_flags; 768 769 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 770 if (ifm->ifi_change) 771 flags = (flags & ifm->ifi_change) | 772 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 773 774 return flags; 775 } 776 777 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 778 const struct rtnl_link_stats64 *b) 779 { 780 a->rx_packets = b->rx_packets; 781 a->tx_packets = b->tx_packets; 782 a->rx_bytes = b->rx_bytes; 783 a->tx_bytes = b->tx_bytes; 784 a->rx_errors = b->rx_errors; 785 a->tx_errors = b->tx_errors; 786 a->rx_dropped = b->rx_dropped; 787 a->tx_dropped = b->tx_dropped; 788 789 a->multicast = b->multicast; 790 a->collisions = b->collisions; 791 792 a->rx_length_errors = b->rx_length_errors; 793 a->rx_over_errors = b->rx_over_errors; 794 a->rx_crc_errors = b->rx_crc_errors; 795 a->rx_frame_errors = b->rx_frame_errors; 796 a->rx_fifo_errors = b->rx_fifo_errors; 797 a->rx_missed_errors = b->rx_missed_errors; 798 799 a->tx_aborted_errors = b->tx_aborted_errors; 800 a->tx_carrier_errors = b->tx_carrier_errors; 801 a->tx_fifo_errors = b->tx_fifo_errors; 802 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 803 a->tx_window_errors = b->tx_window_errors; 804 805 a->rx_compressed = b->rx_compressed; 806 a->tx_compressed = b->tx_compressed; 807 } 808 809 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 810 { 811 memcpy(v, b, sizeof(*b)); 812 } 813 814 /* All VF info */ 815 static inline int rtnl_vfinfo_size(const struct net_device *dev, 816 u32 ext_filter_mask) 817 { 818 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 819 (ext_filter_mask & RTEXT_FILTER_VF)) { 820 int num_vfs = dev_num_vf(dev->dev.parent); 821 size_t size = nla_total_size(sizeof(struct nlattr)); 822 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 823 size += num_vfs * 824 (nla_total_size(sizeof(struct ifla_vf_mac)) + 825 nla_total_size(sizeof(struct ifla_vf_vlan)) + 826 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 827 nla_total_size(sizeof(struct ifla_vf_rate)) + 828 nla_total_size(sizeof(struct ifla_vf_link_state)) + 829 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 830 /* IFLA_VF_STATS_RX_PACKETS */ 831 nla_total_size(sizeof(__u64)) + 832 /* IFLA_VF_STATS_TX_PACKETS */ 833 nla_total_size(sizeof(__u64)) + 834 /* IFLA_VF_STATS_RX_BYTES */ 835 nla_total_size(sizeof(__u64)) + 836 /* IFLA_VF_STATS_TX_BYTES */ 837 nla_total_size(sizeof(__u64)) + 838 /* IFLA_VF_STATS_BROADCAST */ 839 nla_total_size(sizeof(__u64)) + 840 /* IFLA_VF_STATS_MULTICAST */ 841 nla_total_size(sizeof(__u64)) + 842 nla_total_size(sizeof(struct ifla_vf_trust))); 843 return size; 844 } else 845 return 0; 846 } 847 848 static size_t rtnl_port_size(const struct net_device *dev, 849 u32 ext_filter_mask) 850 { 851 size_t port_size = nla_total_size(4) /* PORT_VF */ 852 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 853 + nla_total_size(sizeof(struct ifla_port_vsi)) 854 /* PORT_VSI_TYPE */ 855 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 856 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 857 + nla_total_size(1) /* PROT_VDP_REQUEST */ 858 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 859 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 860 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 861 + port_size; 862 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 863 + port_size; 864 865 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 866 !(ext_filter_mask & RTEXT_FILTER_VF)) 867 return 0; 868 if (dev_num_vf(dev->dev.parent)) 869 return port_self_size + vf_ports_size + 870 vf_port_size * dev_num_vf(dev->dev.parent); 871 else 872 return port_self_size; 873 } 874 875 static noinline size_t if_nlmsg_size(const struct net_device *dev, 876 u32 ext_filter_mask) 877 { 878 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 879 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 880 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 881 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 882 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 883 + nla_total_size(sizeof(struct rtnl_link_stats)) 884 + nla_total_size(sizeof(struct rtnl_link_stats64)) 885 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 886 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 887 + nla_total_size(4) /* IFLA_TXQLEN */ 888 + nla_total_size(4) /* IFLA_WEIGHT */ 889 + nla_total_size(4) /* IFLA_MTU */ 890 + nla_total_size(4) /* IFLA_LINK */ 891 + nla_total_size(4) /* IFLA_MASTER */ 892 + nla_total_size(1) /* IFLA_CARRIER */ 893 + nla_total_size(4) /* IFLA_PROMISCUITY */ 894 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 895 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 896 + nla_total_size(1) /* IFLA_OPERSTATE */ 897 + nla_total_size(1) /* IFLA_LINKMODE */ 898 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 899 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 900 + nla_total_size(ext_filter_mask 901 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 902 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 903 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 904 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 905 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 906 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 907 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 908 + nla_total_size(1); /* IFLA_PROTO_DOWN */ 909 910 } 911 912 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 913 { 914 struct nlattr *vf_ports; 915 struct nlattr *vf_port; 916 int vf; 917 int err; 918 919 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 920 if (!vf_ports) 921 return -EMSGSIZE; 922 923 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 924 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 925 if (!vf_port) 926 goto nla_put_failure; 927 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 928 goto nla_put_failure; 929 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 930 if (err == -EMSGSIZE) 931 goto nla_put_failure; 932 if (err) { 933 nla_nest_cancel(skb, vf_port); 934 continue; 935 } 936 nla_nest_end(skb, vf_port); 937 } 938 939 nla_nest_end(skb, vf_ports); 940 941 return 0; 942 943 nla_put_failure: 944 nla_nest_cancel(skb, vf_ports); 945 return -EMSGSIZE; 946 } 947 948 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 949 { 950 struct nlattr *port_self; 951 int err; 952 953 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 954 if (!port_self) 955 return -EMSGSIZE; 956 957 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 958 if (err) { 959 nla_nest_cancel(skb, port_self); 960 return (err == -EMSGSIZE) ? err : 0; 961 } 962 963 nla_nest_end(skb, port_self); 964 965 return 0; 966 } 967 968 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 969 u32 ext_filter_mask) 970 { 971 int err; 972 973 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 974 !(ext_filter_mask & RTEXT_FILTER_VF)) 975 return 0; 976 977 err = rtnl_port_self_fill(skb, dev); 978 if (err) 979 return err; 980 981 if (dev_num_vf(dev->dev.parent)) { 982 err = rtnl_vf_ports_fill(skb, dev); 983 if (err) 984 return err; 985 } 986 987 return 0; 988 } 989 990 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 991 { 992 int err; 993 struct netdev_phys_item_id ppid; 994 995 err = dev_get_phys_port_id(dev, &ppid); 996 if (err) { 997 if (err == -EOPNOTSUPP) 998 return 0; 999 return err; 1000 } 1001 1002 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1003 return -EMSGSIZE; 1004 1005 return 0; 1006 } 1007 1008 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1009 { 1010 char name[IFNAMSIZ]; 1011 int err; 1012 1013 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1014 if (err) { 1015 if (err == -EOPNOTSUPP) 1016 return 0; 1017 return err; 1018 } 1019 1020 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 1021 return -EMSGSIZE; 1022 1023 return 0; 1024 } 1025 1026 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1027 { 1028 int err; 1029 struct switchdev_attr attr = { 1030 .orig_dev = dev, 1031 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 1032 .flags = SWITCHDEV_F_NO_RECURSE, 1033 }; 1034 1035 err = switchdev_port_attr_get(dev, &attr); 1036 if (err) { 1037 if (err == -EOPNOTSUPP) 1038 return 0; 1039 return err; 1040 } 1041 1042 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1043 attr.u.ppid.id)) 1044 return -EMSGSIZE; 1045 1046 return 0; 1047 } 1048 1049 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1050 struct net_device *dev) 1051 { 1052 const struct rtnl_link_stats64 *stats; 1053 struct rtnl_link_stats64 temp; 1054 struct nlattr *attr; 1055 1056 stats = dev_get_stats(dev, &temp); 1057 1058 attr = nla_reserve(skb, IFLA_STATS, 1059 sizeof(struct rtnl_link_stats)); 1060 if (!attr) 1061 return -EMSGSIZE; 1062 1063 copy_rtnl_link_stats(nla_data(attr), stats); 1064 1065 attr = nla_reserve(skb, IFLA_STATS64, 1066 sizeof(struct rtnl_link_stats64)); 1067 if (!attr) 1068 return -EMSGSIZE; 1069 1070 copy_rtnl_link_stats64(nla_data(attr), stats); 1071 1072 return 0; 1073 } 1074 1075 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1076 struct net_device *dev, 1077 int vfs_num, 1078 struct nlattr *vfinfo) 1079 { 1080 struct ifla_vf_rss_query_en vf_rss_query_en; 1081 struct ifla_vf_link_state vf_linkstate; 1082 struct ifla_vf_spoofchk vf_spoofchk; 1083 struct ifla_vf_tx_rate vf_tx_rate; 1084 struct ifla_vf_stats vf_stats; 1085 struct ifla_vf_trust vf_trust; 1086 struct ifla_vf_vlan vf_vlan; 1087 struct ifla_vf_rate vf_rate; 1088 struct nlattr *vf, *vfstats; 1089 struct ifla_vf_mac vf_mac; 1090 struct ifla_vf_info ivi; 1091 1092 /* Not all SR-IOV capable drivers support the 1093 * spoofcheck and "RSS query enable" query. Preset to 1094 * -1 so the user space tool can detect that the driver 1095 * didn't report anything. 1096 */ 1097 ivi.spoofchk = -1; 1098 ivi.rss_query_en = -1; 1099 ivi.trusted = -1; 1100 memset(ivi.mac, 0, sizeof(ivi.mac)); 1101 /* The default value for VF link state is "auto" 1102 * IFLA_VF_LINK_STATE_AUTO which equals zero 1103 */ 1104 ivi.linkstate = 0; 1105 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1106 return 0; 1107 1108 vf_mac.vf = 1109 vf_vlan.vf = 1110 vf_rate.vf = 1111 vf_tx_rate.vf = 1112 vf_spoofchk.vf = 1113 vf_linkstate.vf = 1114 vf_rss_query_en.vf = 1115 vf_trust.vf = ivi.vf; 1116 1117 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1118 vf_vlan.vlan = ivi.vlan; 1119 vf_vlan.qos = ivi.qos; 1120 vf_tx_rate.rate = ivi.max_tx_rate; 1121 vf_rate.min_tx_rate = ivi.min_tx_rate; 1122 vf_rate.max_tx_rate = ivi.max_tx_rate; 1123 vf_spoofchk.setting = ivi.spoofchk; 1124 vf_linkstate.link_state = ivi.linkstate; 1125 vf_rss_query_en.setting = ivi.rss_query_en; 1126 vf_trust.setting = ivi.trusted; 1127 vf = nla_nest_start(skb, IFLA_VF_INFO); 1128 if (!vf) { 1129 nla_nest_cancel(skb, vfinfo); 1130 return -EMSGSIZE; 1131 } 1132 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1133 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1134 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1135 &vf_rate) || 1136 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1137 &vf_tx_rate) || 1138 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1139 &vf_spoofchk) || 1140 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1141 &vf_linkstate) || 1142 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1143 sizeof(vf_rss_query_en), 1144 &vf_rss_query_en) || 1145 nla_put(skb, IFLA_VF_TRUST, 1146 sizeof(vf_trust), &vf_trust)) 1147 return -EMSGSIZE; 1148 memset(&vf_stats, 0, sizeof(vf_stats)); 1149 if (dev->netdev_ops->ndo_get_vf_stats) 1150 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1151 &vf_stats); 1152 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1153 if (!vfstats) { 1154 nla_nest_cancel(skb, vf); 1155 nla_nest_cancel(skb, vfinfo); 1156 return -EMSGSIZE; 1157 } 1158 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS, 1159 vf_stats.rx_packets) || 1160 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS, 1161 vf_stats.tx_packets) || 1162 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES, 1163 vf_stats.rx_bytes) || 1164 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES, 1165 vf_stats.tx_bytes) || 1166 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST, 1167 vf_stats.broadcast) || 1168 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST, 1169 vf_stats.multicast)) 1170 return -EMSGSIZE; 1171 nla_nest_end(skb, vfstats); 1172 nla_nest_end(skb, vf); 1173 return 0; 1174 } 1175 1176 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1177 { 1178 struct rtnl_link_ifmap map = { 1179 .mem_start = dev->mem_start, 1180 .mem_end = dev->mem_end, 1181 .base_addr = dev->base_addr, 1182 .irq = dev->irq, 1183 .dma = dev->dma, 1184 .port = dev->if_port, 1185 }; 1186 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1187 return -EMSGSIZE; 1188 1189 return 0; 1190 } 1191 1192 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1193 int type, u32 pid, u32 seq, u32 change, 1194 unsigned int flags, u32 ext_filter_mask) 1195 { 1196 struct ifinfomsg *ifm; 1197 struct nlmsghdr *nlh; 1198 struct nlattr *af_spec; 1199 struct rtnl_af_ops *af_ops; 1200 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1201 1202 ASSERT_RTNL(); 1203 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1204 if (nlh == NULL) 1205 return -EMSGSIZE; 1206 1207 ifm = nlmsg_data(nlh); 1208 ifm->ifi_family = AF_UNSPEC; 1209 ifm->__ifi_pad = 0; 1210 ifm->ifi_type = dev->type; 1211 ifm->ifi_index = dev->ifindex; 1212 ifm->ifi_flags = dev_get_flags(dev); 1213 ifm->ifi_change = change; 1214 1215 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1216 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1217 nla_put_u8(skb, IFLA_OPERSTATE, 1218 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1219 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1220 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1221 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1222 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1223 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1224 #ifdef CONFIG_RPS 1225 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1226 #endif 1227 (dev->ifindex != dev_get_iflink(dev) && 1228 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1229 (upper_dev && 1230 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1231 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1232 (dev->qdisc && 1233 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1234 (dev->ifalias && 1235 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1236 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1237 atomic_read(&dev->carrier_changes)) || 1238 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1239 goto nla_put_failure; 1240 1241 if (rtnl_fill_link_ifmap(skb, dev)) 1242 goto nla_put_failure; 1243 1244 if (dev->addr_len) { 1245 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1246 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1247 goto nla_put_failure; 1248 } 1249 1250 if (rtnl_phys_port_id_fill(skb, dev)) 1251 goto nla_put_failure; 1252 1253 if (rtnl_phys_port_name_fill(skb, dev)) 1254 goto nla_put_failure; 1255 1256 if (rtnl_phys_switch_id_fill(skb, dev)) 1257 goto nla_put_failure; 1258 1259 if (rtnl_fill_stats(skb, dev)) 1260 goto nla_put_failure; 1261 1262 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1263 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1264 goto nla_put_failure; 1265 1266 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent && 1267 ext_filter_mask & RTEXT_FILTER_VF) { 1268 int i; 1269 struct nlattr *vfinfo; 1270 int num_vfs = dev_num_vf(dev->dev.parent); 1271 1272 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1273 if (!vfinfo) 1274 goto nla_put_failure; 1275 for (i = 0; i < num_vfs; i++) { 1276 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1277 goto nla_put_failure; 1278 } 1279 1280 nla_nest_end(skb, vfinfo); 1281 } 1282 1283 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1284 goto nla_put_failure; 1285 1286 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1287 if (rtnl_link_fill(skb, dev) < 0) 1288 goto nla_put_failure; 1289 } 1290 1291 if (dev->rtnl_link_ops && 1292 dev->rtnl_link_ops->get_link_net) { 1293 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1294 1295 if (!net_eq(dev_net(dev), link_net)) { 1296 int id = peernet2id_alloc(dev_net(dev), link_net); 1297 1298 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1299 goto nla_put_failure; 1300 } 1301 } 1302 1303 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1304 goto nla_put_failure; 1305 1306 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1307 if (af_ops->fill_link_af) { 1308 struct nlattr *af; 1309 int err; 1310 1311 if (!(af = nla_nest_start(skb, af_ops->family))) 1312 goto nla_put_failure; 1313 1314 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1315 1316 /* 1317 * Caller may return ENODATA to indicate that there 1318 * was no data to be dumped. This is not an error, it 1319 * means we should trim the attribute header and 1320 * continue. 1321 */ 1322 if (err == -ENODATA) 1323 nla_nest_cancel(skb, af); 1324 else if (err < 0) 1325 goto nla_put_failure; 1326 1327 nla_nest_end(skb, af); 1328 } 1329 } 1330 1331 nla_nest_end(skb, af_spec); 1332 1333 nlmsg_end(skb, nlh); 1334 return 0; 1335 1336 nla_put_failure: 1337 nlmsg_cancel(skb, nlh); 1338 return -EMSGSIZE; 1339 } 1340 1341 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1342 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1343 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1344 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1345 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1346 [IFLA_MTU] = { .type = NLA_U32 }, 1347 [IFLA_LINK] = { .type = NLA_U32 }, 1348 [IFLA_MASTER] = { .type = NLA_U32 }, 1349 [IFLA_CARRIER] = { .type = NLA_U8 }, 1350 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1351 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1352 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1353 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1354 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1355 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1356 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1357 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1358 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1359 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1360 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1361 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1362 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1363 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1364 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1365 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1366 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1367 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1368 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1369 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1370 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1371 }; 1372 1373 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1374 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1375 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1376 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1377 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1378 }; 1379 1380 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1381 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1382 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1383 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1384 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1385 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1386 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1387 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1388 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1389 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1390 }; 1391 1392 static const struct nla_policy ifla_vf_stats_policy[IFLA_VF_STATS_MAX + 1] = { 1393 [IFLA_VF_STATS_RX_PACKETS] = { .type = NLA_U64 }, 1394 [IFLA_VF_STATS_TX_PACKETS] = { .type = NLA_U64 }, 1395 [IFLA_VF_STATS_RX_BYTES] = { .type = NLA_U64 }, 1396 [IFLA_VF_STATS_TX_BYTES] = { .type = NLA_U64 }, 1397 [IFLA_VF_STATS_BROADCAST] = { .type = NLA_U64 }, 1398 [IFLA_VF_STATS_MULTICAST] = { .type = NLA_U64 }, 1399 }; 1400 1401 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1402 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1403 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1404 .len = PORT_PROFILE_MAX }, 1405 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1406 .len = sizeof(struct ifla_port_vsi)}, 1407 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1408 .len = PORT_UUID_MAX }, 1409 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1410 .len = PORT_UUID_MAX }, 1411 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1412 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1413 }; 1414 1415 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1416 { 1417 struct net *net = sock_net(skb->sk); 1418 int h, s_h; 1419 int idx = 0, s_idx; 1420 struct net_device *dev; 1421 struct hlist_head *head; 1422 struct nlattr *tb[IFLA_MAX+1]; 1423 u32 ext_filter_mask = 0; 1424 int err; 1425 int hdrlen; 1426 1427 s_h = cb->args[0]; 1428 s_idx = cb->args[1]; 1429 1430 cb->seq = net->dev_base_seq; 1431 1432 /* A hack to preserve kernel<->userspace interface. 1433 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1434 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1435 * what iproute2 < v3.9.0 used. 1436 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1437 * attribute, its netlink message is shorter than struct ifinfomsg. 1438 */ 1439 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1440 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1441 1442 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1443 1444 if (tb[IFLA_EXT_MASK]) 1445 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1446 } 1447 1448 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1449 idx = 0; 1450 head = &net->dev_index_head[h]; 1451 hlist_for_each_entry(dev, head, index_hlist) { 1452 if (idx < s_idx) 1453 goto cont; 1454 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1455 NETLINK_CB(cb->skb).portid, 1456 cb->nlh->nlmsg_seq, 0, 1457 NLM_F_MULTI, 1458 ext_filter_mask); 1459 /* If we ran out of room on the first message, 1460 * we're in trouble 1461 */ 1462 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1463 1464 if (err < 0) 1465 goto out; 1466 1467 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1468 cont: 1469 idx++; 1470 } 1471 } 1472 out: 1473 cb->args[1] = idx; 1474 cb->args[0] = h; 1475 1476 return skb->len; 1477 } 1478 1479 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1480 { 1481 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1482 } 1483 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1484 1485 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1486 { 1487 struct net *net; 1488 /* Examine the link attributes and figure out which 1489 * network namespace we are talking about. 1490 */ 1491 if (tb[IFLA_NET_NS_PID]) 1492 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1493 else if (tb[IFLA_NET_NS_FD]) 1494 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1495 else 1496 net = get_net(src_net); 1497 return net; 1498 } 1499 EXPORT_SYMBOL(rtnl_link_get_net); 1500 1501 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1502 { 1503 if (dev) { 1504 if (tb[IFLA_ADDRESS] && 1505 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1506 return -EINVAL; 1507 1508 if (tb[IFLA_BROADCAST] && 1509 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1510 return -EINVAL; 1511 } 1512 1513 if (tb[IFLA_AF_SPEC]) { 1514 struct nlattr *af; 1515 int rem, err; 1516 1517 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1518 const struct rtnl_af_ops *af_ops; 1519 1520 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1521 return -EAFNOSUPPORT; 1522 1523 if (!af_ops->set_link_af) 1524 return -EOPNOTSUPP; 1525 1526 if (af_ops->validate_link_af) { 1527 err = af_ops->validate_link_af(dev, af); 1528 if (err < 0) 1529 return err; 1530 } 1531 } 1532 } 1533 1534 return 0; 1535 } 1536 1537 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 1538 { 1539 const struct net_device_ops *ops = dev->netdev_ops; 1540 int err = -EINVAL; 1541 1542 if (tb[IFLA_VF_MAC]) { 1543 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 1544 1545 err = -EOPNOTSUPP; 1546 if (ops->ndo_set_vf_mac) 1547 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1548 ivm->mac); 1549 if (err < 0) 1550 return err; 1551 } 1552 1553 if (tb[IFLA_VF_VLAN]) { 1554 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 1555 1556 err = -EOPNOTSUPP; 1557 if (ops->ndo_set_vf_vlan) 1558 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 1559 ivv->qos); 1560 if (err < 0) 1561 return err; 1562 } 1563 1564 if (tb[IFLA_VF_TX_RATE]) { 1565 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1566 struct ifla_vf_info ivf; 1567 1568 err = -EOPNOTSUPP; 1569 if (ops->ndo_get_vf_config) 1570 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 1571 if (err < 0) 1572 return err; 1573 1574 err = -EOPNOTSUPP; 1575 if (ops->ndo_set_vf_rate) 1576 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1577 ivf.min_tx_rate, 1578 ivt->rate); 1579 if (err < 0) 1580 return err; 1581 } 1582 1583 if (tb[IFLA_VF_RATE]) { 1584 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 1585 1586 err = -EOPNOTSUPP; 1587 if (ops->ndo_set_vf_rate) 1588 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1589 ivt->min_tx_rate, 1590 ivt->max_tx_rate); 1591 if (err < 0) 1592 return err; 1593 } 1594 1595 if (tb[IFLA_VF_SPOOFCHK]) { 1596 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 1597 1598 err = -EOPNOTSUPP; 1599 if (ops->ndo_set_vf_spoofchk) 1600 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1601 ivs->setting); 1602 if (err < 0) 1603 return err; 1604 } 1605 1606 if (tb[IFLA_VF_LINK_STATE]) { 1607 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 1608 1609 err = -EOPNOTSUPP; 1610 if (ops->ndo_set_vf_link_state) 1611 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1612 ivl->link_state); 1613 if (err < 0) 1614 return err; 1615 } 1616 1617 if (tb[IFLA_VF_RSS_QUERY_EN]) { 1618 struct ifla_vf_rss_query_en *ivrssq_en; 1619 1620 err = -EOPNOTSUPP; 1621 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 1622 if (ops->ndo_set_vf_rss_query_en) 1623 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 1624 ivrssq_en->setting); 1625 if (err < 0) 1626 return err; 1627 } 1628 1629 if (tb[IFLA_VF_TRUST]) { 1630 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 1631 1632 err = -EOPNOTSUPP; 1633 if (ops->ndo_set_vf_trust) 1634 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 1635 if (err < 0) 1636 return err; 1637 } 1638 1639 return err; 1640 } 1641 1642 static int do_set_master(struct net_device *dev, int ifindex) 1643 { 1644 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1645 const struct net_device_ops *ops; 1646 int err; 1647 1648 if (upper_dev) { 1649 if (upper_dev->ifindex == ifindex) 1650 return 0; 1651 ops = upper_dev->netdev_ops; 1652 if (ops->ndo_del_slave) { 1653 err = ops->ndo_del_slave(upper_dev, dev); 1654 if (err) 1655 return err; 1656 } else { 1657 return -EOPNOTSUPP; 1658 } 1659 } 1660 1661 if (ifindex) { 1662 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1663 if (!upper_dev) 1664 return -EINVAL; 1665 ops = upper_dev->netdev_ops; 1666 if (ops->ndo_add_slave) { 1667 err = ops->ndo_add_slave(upper_dev, dev); 1668 if (err) 1669 return err; 1670 } else { 1671 return -EOPNOTSUPP; 1672 } 1673 } 1674 return 0; 1675 } 1676 1677 #define DO_SETLINK_MODIFIED 0x01 1678 /* notify flag means notify + modified. */ 1679 #define DO_SETLINK_NOTIFY 0x03 1680 static int do_setlink(const struct sk_buff *skb, 1681 struct net_device *dev, struct ifinfomsg *ifm, 1682 struct nlattr **tb, char *ifname, int status) 1683 { 1684 const struct net_device_ops *ops = dev->netdev_ops; 1685 int err; 1686 1687 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1688 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1689 if (IS_ERR(net)) { 1690 err = PTR_ERR(net); 1691 goto errout; 1692 } 1693 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1694 put_net(net); 1695 err = -EPERM; 1696 goto errout; 1697 } 1698 err = dev_change_net_namespace(dev, net, ifname); 1699 put_net(net); 1700 if (err) 1701 goto errout; 1702 status |= DO_SETLINK_MODIFIED; 1703 } 1704 1705 if (tb[IFLA_MAP]) { 1706 struct rtnl_link_ifmap *u_map; 1707 struct ifmap k_map; 1708 1709 if (!ops->ndo_set_config) { 1710 err = -EOPNOTSUPP; 1711 goto errout; 1712 } 1713 1714 if (!netif_device_present(dev)) { 1715 err = -ENODEV; 1716 goto errout; 1717 } 1718 1719 u_map = nla_data(tb[IFLA_MAP]); 1720 k_map.mem_start = (unsigned long) u_map->mem_start; 1721 k_map.mem_end = (unsigned long) u_map->mem_end; 1722 k_map.base_addr = (unsigned short) u_map->base_addr; 1723 k_map.irq = (unsigned char) u_map->irq; 1724 k_map.dma = (unsigned char) u_map->dma; 1725 k_map.port = (unsigned char) u_map->port; 1726 1727 err = ops->ndo_set_config(dev, &k_map); 1728 if (err < 0) 1729 goto errout; 1730 1731 status |= DO_SETLINK_NOTIFY; 1732 } 1733 1734 if (tb[IFLA_ADDRESS]) { 1735 struct sockaddr *sa; 1736 int len; 1737 1738 len = sizeof(sa_family_t) + dev->addr_len; 1739 sa = kmalloc(len, GFP_KERNEL); 1740 if (!sa) { 1741 err = -ENOMEM; 1742 goto errout; 1743 } 1744 sa->sa_family = dev->type; 1745 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1746 dev->addr_len); 1747 err = dev_set_mac_address(dev, sa); 1748 kfree(sa); 1749 if (err) 1750 goto errout; 1751 status |= DO_SETLINK_MODIFIED; 1752 } 1753 1754 if (tb[IFLA_MTU]) { 1755 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1756 if (err < 0) 1757 goto errout; 1758 status |= DO_SETLINK_MODIFIED; 1759 } 1760 1761 if (tb[IFLA_GROUP]) { 1762 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1763 status |= DO_SETLINK_NOTIFY; 1764 } 1765 1766 /* 1767 * Interface selected by interface index but interface 1768 * name provided implies that a name change has been 1769 * requested. 1770 */ 1771 if (ifm->ifi_index > 0 && ifname[0]) { 1772 err = dev_change_name(dev, ifname); 1773 if (err < 0) 1774 goto errout; 1775 status |= DO_SETLINK_MODIFIED; 1776 } 1777 1778 if (tb[IFLA_IFALIAS]) { 1779 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1780 nla_len(tb[IFLA_IFALIAS])); 1781 if (err < 0) 1782 goto errout; 1783 status |= DO_SETLINK_NOTIFY; 1784 } 1785 1786 if (tb[IFLA_BROADCAST]) { 1787 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1788 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1789 } 1790 1791 if (ifm->ifi_flags || ifm->ifi_change) { 1792 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1793 if (err < 0) 1794 goto errout; 1795 } 1796 1797 if (tb[IFLA_MASTER]) { 1798 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1799 if (err) 1800 goto errout; 1801 status |= DO_SETLINK_MODIFIED; 1802 } 1803 1804 if (tb[IFLA_CARRIER]) { 1805 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1806 if (err) 1807 goto errout; 1808 status |= DO_SETLINK_MODIFIED; 1809 } 1810 1811 if (tb[IFLA_TXQLEN]) { 1812 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1813 1814 if (dev->tx_queue_len ^ value) 1815 status |= DO_SETLINK_NOTIFY; 1816 1817 dev->tx_queue_len = value; 1818 } 1819 1820 if (tb[IFLA_OPERSTATE]) 1821 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1822 1823 if (tb[IFLA_LINKMODE]) { 1824 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1825 1826 write_lock_bh(&dev_base_lock); 1827 if (dev->link_mode ^ value) 1828 status |= DO_SETLINK_NOTIFY; 1829 dev->link_mode = value; 1830 write_unlock_bh(&dev_base_lock); 1831 } 1832 1833 if (tb[IFLA_VFINFO_LIST]) { 1834 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 1835 struct nlattr *attr; 1836 int rem; 1837 1838 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1839 if (nla_type(attr) != IFLA_VF_INFO || 1840 nla_len(attr) < NLA_HDRLEN) { 1841 err = -EINVAL; 1842 goto errout; 1843 } 1844 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 1845 ifla_vf_policy); 1846 if (err < 0) 1847 goto errout; 1848 err = do_setvfinfo(dev, vfinfo); 1849 if (err < 0) 1850 goto errout; 1851 status |= DO_SETLINK_NOTIFY; 1852 } 1853 } 1854 err = 0; 1855 1856 if (tb[IFLA_VF_PORTS]) { 1857 struct nlattr *port[IFLA_PORT_MAX+1]; 1858 struct nlattr *attr; 1859 int vf; 1860 int rem; 1861 1862 err = -EOPNOTSUPP; 1863 if (!ops->ndo_set_vf_port) 1864 goto errout; 1865 1866 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1867 if (nla_type(attr) != IFLA_VF_PORT || 1868 nla_len(attr) < NLA_HDRLEN) { 1869 err = -EINVAL; 1870 goto errout; 1871 } 1872 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 1873 ifla_port_policy); 1874 if (err < 0) 1875 goto errout; 1876 if (!port[IFLA_PORT_VF]) { 1877 err = -EOPNOTSUPP; 1878 goto errout; 1879 } 1880 vf = nla_get_u32(port[IFLA_PORT_VF]); 1881 err = ops->ndo_set_vf_port(dev, vf, port); 1882 if (err < 0) 1883 goto errout; 1884 status |= DO_SETLINK_NOTIFY; 1885 } 1886 } 1887 err = 0; 1888 1889 if (tb[IFLA_PORT_SELF]) { 1890 struct nlattr *port[IFLA_PORT_MAX+1]; 1891 1892 err = nla_parse_nested(port, IFLA_PORT_MAX, 1893 tb[IFLA_PORT_SELF], ifla_port_policy); 1894 if (err < 0) 1895 goto errout; 1896 1897 err = -EOPNOTSUPP; 1898 if (ops->ndo_set_vf_port) 1899 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1900 if (err < 0) 1901 goto errout; 1902 status |= DO_SETLINK_NOTIFY; 1903 } 1904 1905 if (tb[IFLA_AF_SPEC]) { 1906 struct nlattr *af; 1907 int rem; 1908 1909 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1910 const struct rtnl_af_ops *af_ops; 1911 1912 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1913 BUG(); 1914 1915 err = af_ops->set_link_af(dev, af); 1916 if (err < 0) 1917 goto errout; 1918 1919 status |= DO_SETLINK_NOTIFY; 1920 } 1921 } 1922 err = 0; 1923 1924 if (tb[IFLA_PROTO_DOWN]) { 1925 err = dev_change_proto_down(dev, 1926 nla_get_u8(tb[IFLA_PROTO_DOWN])); 1927 if (err) 1928 goto errout; 1929 status |= DO_SETLINK_NOTIFY; 1930 } 1931 1932 errout: 1933 if (status & DO_SETLINK_MODIFIED) { 1934 if (status & DO_SETLINK_NOTIFY) 1935 netdev_state_change(dev); 1936 1937 if (err < 0) 1938 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", 1939 dev->name); 1940 } 1941 1942 return err; 1943 } 1944 1945 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1946 { 1947 struct net *net = sock_net(skb->sk); 1948 struct ifinfomsg *ifm; 1949 struct net_device *dev; 1950 int err; 1951 struct nlattr *tb[IFLA_MAX+1]; 1952 char ifname[IFNAMSIZ]; 1953 1954 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1955 if (err < 0) 1956 goto errout; 1957 1958 if (tb[IFLA_IFNAME]) 1959 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1960 else 1961 ifname[0] = '\0'; 1962 1963 err = -EINVAL; 1964 ifm = nlmsg_data(nlh); 1965 if (ifm->ifi_index > 0) 1966 dev = __dev_get_by_index(net, ifm->ifi_index); 1967 else if (tb[IFLA_IFNAME]) 1968 dev = __dev_get_by_name(net, ifname); 1969 else 1970 goto errout; 1971 1972 if (dev == NULL) { 1973 err = -ENODEV; 1974 goto errout; 1975 } 1976 1977 err = validate_linkmsg(dev, tb); 1978 if (err < 0) 1979 goto errout; 1980 1981 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 1982 errout: 1983 return err; 1984 } 1985 1986 static int rtnl_group_dellink(const struct net *net, int group) 1987 { 1988 struct net_device *dev, *aux; 1989 LIST_HEAD(list_kill); 1990 bool found = false; 1991 1992 if (!group) 1993 return -EPERM; 1994 1995 for_each_netdev(net, dev) { 1996 if (dev->group == group) { 1997 const struct rtnl_link_ops *ops; 1998 1999 found = true; 2000 ops = dev->rtnl_link_ops; 2001 if (!ops || !ops->dellink) 2002 return -EOPNOTSUPP; 2003 } 2004 } 2005 2006 if (!found) 2007 return -ENODEV; 2008 2009 for_each_netdev_safe(net, dev, aux) { 2010 if (dev->group == group) { 2011 const struct rtnl_link_ops *ops; 2012 2013 ops = dev->rtnl_link_ops; 2014 ops->dellink(dev, &list_kill); 2015 } 2016 } 2017 unregister_netdevice_many(&list_kill); 2018 2019 return 0; 2020 } 2021 2022 int rtnl_delete_link(struct net_device *dev) 2023 { 2024 const struct rtnl_link_ops *ops; 2025 LIST_HEAD(list_kill); 2026 2027 ops = dev->rtnl_link_ops; 2028 if (!ops || !ops->dellink) 2029 return -EOPNOTSUPP; 2030 2031 ops->dellink(dev, &list_kill); 2032 unregister_netdevice_many(&list_kill); 2033 2034 return 0; 2035 } 2036 EXPORT_SYMBOL_GPL(rtnl_delete_link); 2037 2038 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2039 { 2040 struct net *net = sock_net(skb->sk); 2041 struct net_device *dev; 2042 struct ifinfomsg *ifm; 2043 char ifname[IFNAMSIZ]; 2044 struct nlattr *tb[IFLA_MAX+1]; 2045 int err; 2046 2047 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2048 if (err < 0) 2049 return err; 2050 2051 if (tb[IFLA_IFNAME]) 2052 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2053 2054 ifm = nlmsg_data(nlh); 2055 if (ifm->ifi_index > 0) 2056 dev = __dev_get_by_index(net, ifm->ifi_index); 2057 else if (tb[IFLA_IFNAME]) 2058 dev = __dev_get_by_name(net, ifname); 2059 else if (tb[IFLA_GROUP]) 2060 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 2061 else 2062 return -EINVAL; 2063 2064 if (!dev) 2065 return -ENODEV; 2066 2067 return rtnl_delete_link(dev); 2068 } 2069 2070 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 2071 { 2072 unsigned int old_flags; 2073 int err; 2074 2075 old_flags = dev->flags; 2076 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2077 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2078 if (err < 0) 2079 return err; 2080 } 2081 2082 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2083 2084 __dev_notify_flags(dev, old_flags, ~0U); 2085 return 0; 2086 } 2087 EXPORT_SYMBOL(rtnl_configure_link); 2088 2089 struct net_device *rtnl_create_link(struct net *net, 2090 const char *ifname, unsigned char name_assign_type, 2091 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2092 { 2093 int err; 2094 struct net_device *dev; 2095 unsigned int num_tx_queues = 1; 2096 unsigned int num_rx_queues = 1; 2097 2098 if (tb[IFLA_NUM_TX_QUEUES]) 2099 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2100 else if (ops->get_num_tx_queues) 2101 num_tx_queues = ops->get_num_tx_queues(); 2102 2103 if (tb[IFLA_NUM_RX_QUEUES]) 2104 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2105 else if (ops->get_num_rx_queues) 2106 num_rx_queues = ops->get_num_rx_queues(); 2107 2108 err = -ENOMEM; 2109 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2110 ops->setup, num_tx_queues, num_rx_queues); 2111 if (!dev) 2112 goto err; 2113 2114 dev_net_set(dev, net); 2115 dev->rtnl_link_ops = ops; 2116 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2117 2118 if (tb[IFLA_MTU]) 2119 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2120 if (tb[IFLA_ADDRESS]) { 2121 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2122 nla_len(tb[IFLA_ADDRESS])); 2123 dev->addr_assign_type = NET_ADDR_SET; 2124 } 2125 if (tb[IFLA_BROADCAST]) 2126 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2127 nla_len(tb[IFLA_BROADCAST])); 2128 if (tb[IFLA_TXQLEN]) 2129 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2130 if (tb[IFLA_OPERSTATE]) 2131 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2132 if (tb[IFLA_LINKMODE]) 2133 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2134 if (tb[IFLA_GROUP]) 2135 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2136 2137 return dev; 2138 2139 err: 2140 return ERR_PTR(err); 2141 } 2142 EXPORT_SYMBOL(rtnl_create_link); 2143 2144 static int rtnl_group_changelink(const struct sk_buff *skb, 2145 struct net *net, int group, 2146 struct ifinfomsg *ifm, 2147 struct nlattr **tb) 2148 { 2149 struct net_device *dev, *aux; 2150 int err; 2151 2152 for_each_netdev_safe(net, dev, aux) { 2153 if (dev->group == group) { 2154 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2155 if (err < 0) 2156 return err; 2157 } 2158 } 2159 2160 return 0; 2161 } 2162 2163 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2164 { 2165 struct net *net = sock_net(skb->sk); 2166 const struct rtnl_link_ops *ops; 2167 const struct rtnl_link_ops *m_ops = NULL; 2168 struct net_device *dev; 2169 struct net_device *master_dev = NULL; 2170 struct ifinfomsg *ifm; 2171 char kind[MODULE_NAME_LEN]; 2172 char ifname[IFNAMSIZ]; 2173 struct nlattr *tb[IFLA_MAX+1]; 2174 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2175 unsigned char name_assign_type = NET_NAME_USER; 2176 int err; 2177 2178 #ifdef CONFIG_MODULES 2179 replay: 2180 #endif 2181 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2182 if (err < 0) 2183 return err; 2184 2185 if (tb[IFLA_IFNAME]) 2186 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2187 else 2188 ifname[0] = '\0'; 2189 2190 ifm = nlmsg_data(nlh); 2191 if (ifm->ifi_index > 0) 2192 dev = __dev_get_by_index(net, ifm->ifi_index); 2193 else { 2194 if (ifname[0]) 2195 dev = __dev_get_by_name(net, ifname); 2196 else 2197 dev = NULL; 2198 } 2199 2200 if (dev) { 2201 master_dev = netdev_master_upper_dev_get(dev); 2202 if (master_dev) 2203 m_ops = master_dev->rtnl_link_ops; 2204 } 2205 2206 err = validate_linkmsg(dev, tb); 2207 if (err < 0) 2208 return err; 2209 2210 if (tb[IFLA_LINKINFO]) { 2211 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2212 tb[IFLA_LINKINFO], ifla_info_policy); 2213 if (err < 0) 2214 return err; 2215 } else 2216 memset(linkinfo, 0, sizeof(linkinfo)); 2217 2218 if (linkinfo[IFLA_INFO_KIND]) { 2219 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2220 ops = rtnl_link_ops_get(kind); 2221 } else { 2222 kind[0] = '\0'; 2223 ops = NULL; 2224 } 2225 2226 if (1) { 2227 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2228 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2229 struct nlattr **data = NULL; 2230 struct nlattr **slave_data = NULL; 2231 struct net *dest_net, *link_net = NULL; 2232 2233 if (ops) { 2234 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2235 err = nla_parse_nested(attr, ops->maxtype, 2236 linkinfo[IFLA_INFO_DATA], 2237 ops->policy); 2238 if (err < 0) 2239 return err; 2240 data = attr; 2241 } 2242 if (ops->validate) { 2243 err = ops->validate(tb, data); 2244 if (err < 0) 2245 return err; 2246 } 2247 } 2248 2249 if (m_ops) { 2250 if (m_ops->slave_maxtype && 2251 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2252 err = nla_parse_nested(slave_attr, 2253 m_ops->slave_maxtype, 2254 linkinfo[IFLA_INFO_SLAVE_DATA], 2255 m_ops->slave_policy); 2256 if (err < 0) 2257 return err; 2258 slave_data = slave_attr; 2259 } 2260 if (m_ops->slave_validate) { 2261 err = m_ops->slave_validate(tb, slave_data); 2262 if (err < 0) 2263 return err; 2264 } 2265 } 2266 2267 if (dev) { 2268 int status = 0; 2269 2270 if (nlh->nlmsg_flags & NLM_F_EXCL) 2271 return -EEXIST; 2272 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2273 return -EOPNOTSUPP; 2274 2275 if (linkinfo[IFLA_INFO_DATA]) { 2276 if (!ops || ops != dev->rtnl_link_ops || 2277 !ops->changelink) 2278 return -EOPNOTSUPP; 2279 2280 err = ops->changelink(dev, tb, data); 2281 if (err < 0) 2282 return err; 2283 status |= DO_SETLINK_NOTIFY; 2284 } 2285 2286 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2287 if (!m_ops || !m_ops->slave_changelink) 2288 return -EOPNOTSUPP; 2289 2290 err = m_ops->slave_changelink(master_dev, dev, 2291 tb, slave_data); 2292 if (err < 0) 2293 return err; 2294 status |= DO_SETLINK_NOTIFY; 2295 } 2296 2297 return do_setlink(skb, dev, ifm, tb, ifname, status); 2298 } 2299 2300 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2301 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2302 return rtnl_group_changelink(skb, net, 2303 nla_get_u32(tb[IFLA_GROUP]), 2304 ifm, tb); 2305 return -ENODEV; 2306 } 2307 2308 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2309 return -EOPNOTSUPP; 2310 2311 if (!ops) { 2312 #ifdef CONFIG_MODULES 2313 if (kind[0]) { 2314 __rtnl_unlock(); 2315 request_module("rtnl-link-%s", kind); 2316 rtnl_lock(); 2317 ops = rtnl_link_ops_get(kind); 2318 if (ops) 2319 goto replay; 2320 } 2321 #endif 2322 return -EOPNOTSUPP; 2323 } 2324 2325 if (!ops->setup) 2326 return -EOPNOTSUPP; 2327 2328 if (!ifname[0]) { 2329 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2330 name_assign_type = NET_NAME_ENUM; 2331 } 2332 2333 dest_net = rtnl_link_get_net(net, tb); 2334 if (IS_ERR(dest_net)) 2335 return PTR_ERR(dest_net); 2336 2337 err = -EPERM; 2338 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2339 goto out; 2340 2341 if (tb[IFLA_LINK_NETNSID]) { 2342 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2343 2344 link_net = get_net_ns_by_id(dest_net, id); 2345 if (!link_net) { 2346 err = -EINVAL; 2347 goto out; 2348 } 2349 err = -EPERM; 2350 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2351 goto out; 2352 } 2353 2354 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2355 name_assign_type, ops, tb); 2356 if (IS_ERR(dev)) { 2357 err = PTR_ERR(dev); 2358 goto out; 2359 } 2360 2361 dev->ifindex = ifm->ifi_index; 2362 2363 if (ops->newlink) { 2364 err = ops->newlink(link_net ? : net, dev, tb, data); 2365 /* Drivers should call free_netdev() in ->destructor 2366 * and unregister it on failure after registration 2367 * so that device could be finally freed in rtnl_unlock. 2368 */ 2369 if (err < 0) { 2370 /* If device is not registered at all, free it now */ 2371 if (dev->reg_state == NETREG_UNINITIALIZED) 2372 free_netdev(dev); 2373 goto out; 2374 } 2375 } else { 2376 err = register_netdevice(dev); 2377 if (err < 0) { 2378 free_netdev(dev); 2379 goto out; 2380 } 2381 } 2382 err = rtnl_configure_link(dev, ifm); 2383 if (err < 0) 2384 goto out_unregister; 2385 if (link_net) { 2386 err = dev_change_net_namespace(dev, dest_net, ifname); 2387 if (err < 0) 2388 goto out_unregister; 2389 } 2390 out: 2391 if (link_net) 2392 put_net(link_net); 2393 put_net(dest_net); 2394 return err; 2395 out_unregister: 2396 if (ops->newlink) { 2397 LIST_HEAD(list_kill); 2398 2399 ops->dellink(dev, &list_kill); 2400 unregister_netdevice_many(&list_kill); 2401 } else { 2402 unregister_netdevice(dev); 2403 } 2404 goto out; 2405 } 2406 } 2407 2408 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2409 { 2410 struct net *net = sock_net(skb->sk); 2411 struct ifinfomsg *ifm; 2412 char ifname[IFNAMSIZ]; 2413 struct nlattr *tb[IFLA_MAX+1]; 2414 struct net_device *dev = NULL; 2415 struct sk_buff *nskb; 2416 int err; 2417 u32 ext_filter_mask = 0; 2418 2419 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2420 if (err < 0) 2421 return err; 2422 2423 if (tb[IFLA_IFNAME]) 2424 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2425 2426 if (tb[IFLA_EXT_MASK]) 2427 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2428 2429 ifm = nlmsg_data(nlh); 2430 if (ifm->ifi_index > 0) 2431 dev = __dev_get_by_index(net, ifm->ifi_index); 2432 else if (tb[IFLA_IFNAME]) 2433 dev = __dev_get_by_name(net, ifname); 2434 else 2435 return -EINVAL; 2436 2437 if (dev == NULL) 2438 return -ENODEV; 2439 2440 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2441 if (nskb == NULL) 2442 return -ENOBUFS; 2443 2444 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2445 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2446 if (err < 0) { 2447 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2448 WARN_ON(err == -EMSGSIZE); 2449 kfree_skb(nskb); 2450 } else 2451 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2452 2453 return err; 2454 } 2455 2456 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2457 { 2458 struct net *net = sock_net(skb->sk); 2459 struct net_device *dev; 2460 struct nlattr *tb[IFLA_MAX+1]; 2461 u32 ext_filter_mask = 0; 2462 u16 min_ifinfo_dump_size = 0; 2463 int hdrlen; 2464 2465 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2466 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2467 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2468 2469 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2470 if (tb[IFLA_EXT_MASK]) 2471 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2472 } 2473 2474 if (!ext_filter_mask) 2475 return NLMSG_GOODSIZE; 2476 /* 2477 * traverse the list of net devices and compute the minimum 2478 * buffer size based upon the filter mask. 2479 */ 2480 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2481 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2482 if_nlmsg_size(dev, 2483 ext_filter_mask)); 2484 } 2485 2486 return min_ifinfo_dump_size; 2487 } 2488 2489 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2490 { 2491 int idx; 2492 int s_idx = cb->family; 2493 2494 if (s_idx == 0) 2495 s_idx = 1; 2496 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2497 int type = cb->nlh->nlmsg_type-RTM_BASE; 2498 if (idx < s_idx || idx == PF_PACKET) 2499 continue; 2500 if (rtnl_msg_handlers[idx] == NULL || 2501 rtnl_msg_handlers[idx][type].dumpit == NULL) 2502 continue; 2503 if (idx > s_idx) { 2504 memset(&cb->args[0], 0, sizeof(cb->args)); 2505 cb->prev_seq = 0; 2506 cb->seq = 0; 2507 } 2508 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2509 break; 2510 } 2511 cb->family = idx; 2512 2513 return skb->len; 2514 } 2515 2516 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2517 unsigned int change, gfp_t flags) 2518 { 2519 struct net *net = dev_net(dev); 2520 struct sk_buff *skb; 2521 int err = -ENOBUFS; 2522 size_t if_info_size; 2523 2524 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2525 if (skb == NULL) 2526 goto errout; 2527 2528 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2529 if (err < 0) { 2530 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2531 WARN_ON(err == -EMSGSIZE); 2532 kfree_skb(skb); 2533 goto errout; 2534 } 2535 return skb; 2536 errout: 2537 if (err < 0) 2538 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2539 return NULL; 2540 } 2541 2542 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2543 { 2544 struct net *net = dev_net(dev); 2545 2546 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2547 } 2548 2549 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2550 gfp_t flags) 2551 { 2552 struct sk_buff *skb; 2553 2554 if (dev->reg_state != NETREG_REGISTERED) 2555 return; 2556 2557 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2558 if (skb) 2559 rtmsg_ifinfo_send(skb, dev, flags); 2560 } 2561 EXPORT_SYMBOL(rtmsg_ifinfo); 2562 2563 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2564 struct net_device *dev, 2565 u8 *addr, u16 vid, u32 pid, u32 seq, 2566 int type, unsigned int flags, 2567 int nlflags, u16 ndm_state) 2568 { 2569 struct nlmsghdr *nlh; 2570 struct ndmsg *ndm; 2571 2572 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2573 if (!nlh) 2574 return -EMSGSIZE; 2575 2576 ndm = nlmsg_data(nlh); 2577 ndm->ndm_family = AF_BRIDGE; 2578 ndm->ndm_pad1 = 0; 2579 ndm->ndm_pad2 = 0; 2580 ndm->ndm_flags = flags; 2581 ndm->ndm_type = 0; 2582 ndm->ndm_ifindex = dev->ifindex; 2583 ndm->ndm_state = ndm_state; 2584 2585 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2586 goto nla_put_failure; 2587 if (vid) 2588 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2589 goto nla_put_failure; 2590 2591 nlmsg_end(skb, nlh); 2592 return 0; 2593 2594 nla_put_failure: 2595 nlmsg_cancel(skb, nlh); 2596 return -EMSGSIZE; 2597 } 2598 2599 static inline size_t rtnl_fdb_nlmsg_size(void) 2600 { 2601 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2602 } 2603 2604 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 2605 u16 ndm_state) 2606 { 2607 struct net *net = dev_net(dev); 2608 struct sk_buff *skb; 2609 int err = -ENOBUFS; 2610 2611 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2612 if (!skb) 2613 goto errout; 2614 2615 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2616 0, 0, type, NTF_SELF, 0, ndm_state); 2617 if (err < 0) { 2618 kfree_skb(skb); 2619 goto errout; 2620 } 2621 2622 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2623 return; 2624 errout: 2625 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2626 } 2627 2628 /** 2629 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2630 */ 2631 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2632 struct nlattr *tb[], 2633 struct net_device *dev, 2634 const unsigned char *addr, u16 vid, 2635 u16 flags) 2636 { 2637 int err = -EINVAL; 2638 2639 /* If aging addresses are supported device will need to 2640 * implement its own handler for this. 2641 */ 2642 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2643 pr_info("%s: FDB only supports static addresses\n", dev->name); 2644 return err; 2645 } 2646 2647 if (vid) { 2648 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2649 return err; 2650 } 2651 2652 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2653 err = dev_uc_add_excl(dev, addr); 2654 else if (is_multicast_ether_addr(addr)) 2655 err = dev_mc_add_excl(dev, addr); 2656 2657 /* Only return duplicate errors if NLM_F_EXCL is set */ 2658 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2659 err = 0; 2660 2661 return err; 2662 } 2663 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2664 2665 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2666 { 2667 u16 vid = 0; 2668 2669 if (vlan_attr) { 2670 if (nla_len(vlan_attr) != sizeof(u16)) { 2671 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2672 return -EINVAL; 2673 } 2674 2675 vid = nla_get_u16(vlan_attr); 2676 2677 if (!vid || vid >= VLAN_VID_MASK) { 2678 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2679 vid); 2680 return -EINVAL; 2681 } 2682 } 2683 *p_vid = vid; 2684 return 0; 2685 } 2686 2687 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2688 { 2689 struct net *net = sock_net(skb->sk); 2690 struct ndmsg *ndm; 2691 struct nlattr *tb[NDA_MAX+1]; 2692 struct net_device *dev; 2693 u8 *addr; 2694 u16 vid; 2695 int err; 2696 2697 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2698 if (err < 0) 2699 return err; 2700 2701 ndm = nlmsg_data(nlh); 2702 if (ndm->ndm_ifindex == 0) { 2703 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2704 return -EINVAL; 2705 } 2706 2707 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2708 if (dev == NULL) { 2709 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2710 return -ENODEV; 2711 } 2712 2713 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2714 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2715 return -EINVAL; 2716 } 2717 2718 addr = nla_data(tb[NDA_LLADDR]); 2719 2720 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2721 if (err) 2722 return err; 2723 2724 err = -EOPNOTSUPP; 2725 2726 /* Support fdb on master device the net/bridge default case */ 2727 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2728 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2729 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2730 const struct net_device_ops *ops = br_dev->netdev_ops; 2731 2732 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2733 nlh->nlmsg_flags); 2734 if (err) 2735 goto out; 2736 else 2737 ndm->ndm_flags &= ~NTF_MASTER; 2738 } 2739 2740 /* Embedded bridge, macvlan, and any other device support */ 2741 if ((ndm->ndm_flags & NTF_SELF)) { 2742 if (dev->netdev_ops->ndo_fdb_add) 2743 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2744 vid, 2745 nlh->nlmsg_flags); 2746 else 2747 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 2748 nlh->nlmsg_flags); 2749 2750 if (!err) { 2751 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 2752 ndm->ndm_state); 2753 ndm->ndm_flags &= ~NTF_SELF; 2754 } 2755 } 2756 out: 2757 return err; 2758 } 2759 2760 /** 2761 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2762 */ 2763 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2764 struct nlattr *tb[], 2765 struct net_device *dev, 2766 const unsigned char *addr, u16 vid) 2767 { 2768 int err = -EINVAL; 2769 2770 /* If aging addresses are supported device will need to 2771 * implement its own handler for this. 2772 */ 2773 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2774 pr_info("%s: FDB only supports static addresses\n", dev->name); 2775 return err; 2776 } 2777 2778 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2779 err = dev_uc_del(dev, addr); 2780 else if (is_multicast_ether_addr(addr)) 2781 err = dev_mc_del(dev, addr); 2782 2783 return err; 2784 } 2785 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2786 2787 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2788 { 2789 struct net *net = sock_net(skb->sk); 2790 struct ndmsg *ndm; 2791 struct nlattr *tb[NDA_MAX+1]; 2792 struct net_device *dev; 2793 int err = -EINVAL; 2794 __u8 *addr; 2795 u16 vid; 2796 2797 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2798 return -EPERM; 2799 2800 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2801 if (err < 0) 2802 return err; 2803 2804 ndm = nlmsg_data(nlh); 2805 if (ndm->ndm_ifindex == 0) { 2806 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2807 return -EINVAL; 2808 } 2809 2810 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2811 if (dev == NULL) { 2812 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2813 return -ENODEV; 2814 } 2815 2816 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2817 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2818 return -EINVAL; 2819 } 2820 2821 addr = nla_data(tb[NDA_LLADDR]); 2822 2823 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2824 if (err) 2825 return err; 2826 2827 err = -EOPNOTSUPP; 2828 2829 /* Support fdb on master device the net/bridge default case */ 2830 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2831 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2832 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2833 const struct net_device_ops *ops = br_dev->netdev_ops; 2834 2835 if (ops->ndo_fdb_del) 2836 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 2837 2838 if (err) 2839 goto out; 2840 else 2841 ndm->ndm_flags &= ~NTF_MASTER; 2842 } 2843 2844 /* Embedded bridge, macvlan, and any other device support */ 2845 if (ndm->ndm_flags & NTF_SELF) { 2846 if (dev->netdev_ops->ndo_fdb_del) 2847 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 2848 vid); 2849 else 2850 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 2851 2852 if (!err) { 2853 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 2854 ndm->ndm_state); 2855 ndm->ndm_flags &= ~NTF_SELF; 2856 } 2857 } 2858 out: 2859 return err; 2860 } 2861 2862 static int nlmsg_populate_fdb(struct sk_buff *skb, 2863 struct netlink_callback *cb, 2864 struct net_device *dev, 2865 int *idx, 2866 struct netdev_hw_addr_list *list) 2867 { 2868 struct netdev_hw_addr *ha; 2869 int err; 2870 u32 portid, seq; 2871 2872 portid = NETLINK_CB(cb->skb).portid; 2873 seq = cb->nlh->nlmsg_seq; 2874 2875 list_for_each_entry(ha, &list->list, list) { 2876 if (*idx < cb->args[0]) 2877 goto skip; 2878 2879 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 2880 portid, seq, 2881 RTM_NEWNEIGH, NTF_SELF, 2882 NLM_F_MULTI, NUD_PERMANENT); 2883 if (err < 0) 2884 return err; 2885 skip: 2886 *idx += 1; 2887 } 2888 return 0; 2889 } 2890 2891 /** 2892 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2893 * @nlh: netlink message header 2894 * @dev: netdevice 2895 * 2896 * Default netdevice operation to dump the existing unicast address list. 2897 * Returns number of addresses from list put in skb. 2898 */ 2899 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2900 struct netlink_callback *cb, 2901 struct net_device *dev, 2902 struct net_device *filter_dev, 2903 int idx) 2904 { 2905 int err; 2906 2907 netif_addr_lock_bh(dev); 2908 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2909 if (err) 2910 goto out; 2911 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2912 out: 2913 netif_addr_unlock_bh(dev); 2914 return idx; 2915 } 2916 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2917 2918 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2919 { 2920 struct net_device *dev; 2921 struct nlattr *tb[IFLA_MAX+1]; 2922 struct net_device *br_dev = NULL; 2923 const struct net_device_ops *ops = NULL; 2924 const struct net_device_ops *cops = NULL; 2925 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2926 struct net *net = sock_net(skb->sk); 2927 int brport_idx = 0; 2928 int br_idx = 0; 2929 int idx = 0; 2930 2931 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 2932 ifla_policy) == 0) { 2933 if (tb[IFLA_MASTER]) 2934 br_idx = nla_get_u32(tb[IFLA_MASTER]); 2935 } 2936 2937 brport_idx = ifm->ifi_index; 2938 2939 if (br_idx) { 2940 br_dev = __dev_get_by_index(net, br_idx); 2941 if (!br_dev) 2942 return -ENODEV; 2943 2944 ops = br_dev->netdev_ops; 2945 } 2946 2947 for_each_netdev(net, dev) { 2948 if (brport_idx && (dev->ifindex != brport_idx)) 2949 continue; 2950 2951 if (!br_idx) { /* user did not specify a specific bridge */ 2952 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2953 br_dev = netdev_master_upper_dev_get(dev); 2954 cops = br_dev->netdev_ops; 2955 } 2956 2957 } else { 2958 if (dev != br_dev && 2959 !(dev->priv_flags & IFF_BRIDGE_PORT)) 2960 continue; 2961 2962 if (br_dev != netdev_master_upper_dev_get(dev) && 2963 !(dev->priv_flags & IFF_EBRIDGE)) 2964 continue; 2965 2966 cops = ops; 2967 } 2968 2969 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2970 if (cops && cops->ndo_fdb_dump) 2971 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 2972 idx); 2973 } 2974 2975 if (dev->netdev_ops->ndo_fdb_dump) 2976 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL, 2977 idx); 2978 else 2979 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 2980 2981 cops = NULL; 2982 } 2983 2984 cb->args[0] = idx; 2985 return skb->len; 2986 } 2987 2988 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 2989 unsigned int attrnum, unsigned int flag) 2990 { 2991 if (mask & flag) 2992 return nla_put_u8(skb, attrnum, !!(flags & flag)); 2993 return 0; 2994 } 2995 2996 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2997 struct net_device *dev, u16 mode, 2998 u32 flags, u32 mask, int nlflags, 2999 u32 filter_mask, 3000 int (*vlan_fill)(struct sk_buff *skb, 3001 struct net_device *dev, 3002 u32 filter_mask)) 3003 { 3004 struct nlmsghdr *nlh; 3005 struct ifinfomsg *ifm; 3006 struct nlattr *br_afspec; 3007 struct nlattr *protinfo; 3008 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 3009 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3010 int err = 0; 3011 3012 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 3013 if (nlh == NULL) 3014 return -EMSGSIZE; 3015 3016 ifm = nlmsg_data(nlh); 3017 ifm->ifi_family = AF_BRIDGE; 3018 ifm->__ifi_pad = 0; 3019 ifm->ifi_type = dev->type; 3020 ifm->ifi_index = dev->ifindex; 3021 ifm->ifi_flags = dev_get_flags(dev); 3022 ifm->ifi_change = 0; 3023 3024 3025 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 3026 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 3027 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 3028 (br_dev && 3029 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 3030 (dev->addr_len && 3031 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 3032 (dev->ifindex != dev_get_iflink(dev) && 3033 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 3034 goto nla_put_failure; 3035 3036 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 3037 if (!br_afspec) 3038 goto nla_put_failure; 3039 3040 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 3041 nla_nest_cancel(skb, br_afspec); 3042 goto nla_put_failure; 3043 } 3044 3045 if (mode != BRIDGE_MODE_UNDEF) { 3046 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 3047 nla_nest_cancel(skb, br_afspec); 3048 goto nla_put_failure; 3049 } 3050 } 3051 if (vlan_fill) { 3052 err = vlan_fill(skb, dev, filter_mask); 3053 if (err) { 3054 nla_nest_cancel(skb, br_afspec); 3055 goto nla_put_failure; 3056 } 3057 } 3058 nla_nest_end(skb, br_afspec); 3059 3060 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 3061 if (!protinfo) 3062 goto nla_put_failure; 3063 3064 if (brport_nla_put_flag(skb, flags, mask, 3065 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 3066 brport_nla_put_flag(skb, flags, mask, 3067 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 3068 brport_nla_put_flag(skb, flags, mask, 3069 IFLA_BRPORT_FAST_LEAVE, 3070 BR_MULTICAST_FAST_LEAVE) || 3071 brport_nla_put_flag(skb, flags, mask, 3072 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 3073 brport_nla_put_flag(skb, flags, mask, 3074 IFLA_BRPORT_LEARNING, BR_LEARNING) || 3075 brport_nla_put_flag(skb, flags, mask, 3076 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 3077 brport_nla_put_flag(skb, flags, mask, 3078 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3079 brport_nla_put_flag(skb, flags, mask, 3080 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3081 nla_nest_cancel(skb, protinfo); 3082 goto nla_put_failure; 3083 } 3084 3085 nla_nest_end(skb, protinfo); 3086 3087 nlmsg_end(skb, nlh); 3088 return 0; 3089 nla_put_failure: 3090 nlmsg_cancel(skb, nlh); 3091 return err ? err : -EMSGSIZE; 3092 } 3093 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3094 3095 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3096 { 3097 struct net *net = sock_net(skb->sk); 3098 struct net_device *dev; 3099 int idx = 0; 3100 u32 portid = NETLINK_CB(cb->skb).portid; 3101 u32 seq = cb->nlh->nlmsg_seq; 3102 u32 filter_mask = 0; 3103 int err; 3104 3105 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3106 struct nlattr *extfilt; 3107 3108 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3109 IFLA_EXT_MASK); 3110 if (extfilt) { 3111 if (nla_len(extfilt) < sizeof(filter_mask)) 3112 return -EINVAL; 3113 3114 filter_mask = nla_get_u32(extfilt); 3115 } 3116 } 3117 3118 rcu_read_lock(); 3119 for_each_netdev_rcu(net, dev) { 3120 const struct net_device_ops *ops = dev->netdev_ops; 3121 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3122 3123 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3124 if (idx >= cb->args[0]) { 3125 err = br_dev->netdev_ops->ndo_bridge_getlink( 3126 skb, portid, seq, dev, 3127 filter_mask, NLM_F_MULTI); 3128 if (err < 0 && err != -EOPNOTSUPP) 3129 break; 3130 } 3131 idx++; 3132 } 3133 3134 if (ops->ndo_bridge_getlink) { 3135 if (idx >= cb->args[0]) { 3136 err = ops->ndo_bridge_getlink(skb, portid, 3137 seq, dev, 3138 filter_mask, 3139 NLM_F_MULTI); 3140 if (err < 0 && err != -EOPNOTSUPP) 3141 break; 3142 } 3143 idx++; 3144 } 3145 } 3146 rcu_read_unlock(); 3147 cb->args[0] = idx; 3148 3149 return skb->len; 3150 } 3151 3152 static inline size_t bridge_nlmsg_size(void) 3153 { 3154 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3155 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3156 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3157 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3158 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3159 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3160 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3161 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3162 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3163 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3164 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3165 } 3166 3167 static int rtnl_bridge_notify(struct net_device *dev) 3168 { 3169 struct net *net = dev_net(dev); 3170 struct sk_buff *skb; 3171 int err = -EOPNOTSUPP; 3172 3173 if (!dev->netdev_ops->ndo_bridge_getlink) 3174 return 0; 3175 3176 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3177 if (!skb) { 3178 err = -ENOMEM; 3179 goto errout; 3180 } 3181 3182 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3183 if (err < 0) 3184 goto errout; 3185 3186 if (!skb->len) 3187 goto errout; 3188 3189 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3190 return 0; 3191 errout: 3192 WARN_ON(err == -EMSGSIZE); 3193 kfree_skb(skb); 3194 if (err) 3195 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3196 return err; 3197 } 3198 3199 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3200 { 3201 struct net *net = sock_net(skb->sk); 3202 struct ifinfomsg *ifm; 3203 struct net_device *dev; 3204 struct nlattr *br_spec, *attr = NULL; 3205 int rem, err = -EOPNOTSUPP; 3206 u16 flags = 0; 3207 bool have_flags = false; 3208 3209 if (nlmsg_len(nlh) < sizeof(*ifm)) 3210 return -EINVAL; 3211 3212 ifm = nlmsg_data(nlh); 3213 if (ifm->ifi_family != AF_BRIDGE) 3214 return -EPFNOSUPPORT; 3215 3216 dev = __dev_get_by_index(net, ifm->ifi_index); 3217 if (!dev) { 3218 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3219 return -ENODEV; 3220 } 3221 3222 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3223 if (br_spec) { 3224 nla_for_each_nested(attr, br_spec, rem) { 3225 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3226 if (nla_len(attr) < sizeof(flags)) 3227 return -EINVAL; 3228 3229 have_flags = true; 3230 flags = nla_get_u16(attr); 3231 break; 3232 } 3233 } 3234 } 3235 3236 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3237 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3238 3239 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3240 err = -EOPNOTSUPP; 3241 goto out; 3242 } 3243 3244 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3245 if (err) 3246 goto out; 3247 3248 flags &= ~BRIDGE_FLAGS_MASTER; 3249 } 3250 3251 if ((flags & BRIDGE_FLAGS_SELF)) { 3252 if (!dev->netdev_ops->ndo_bridge_setlink) 3253 err = -EOPNOTSUPP; 3254 else 3255 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3256 flags); 3257 if (!err) { 3258 flags &= ~BRIDGE_FLAGS_SELF; 3259 3260 /* Generate event to notify upper layer of bridge 3261 * change 3262 */ 3263 err = rtnl_bridge_notify(dev); 3264 } 3265 } 3266 3267 if (have_flags) 3268 memcpy(nla_data(attr), &flags, sizeof(flags)); 3269 out: 3270 return err; 3271 } 3272 3273 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3274 { 3275 struct net *net = sock_net(skb->sk); 3276 struct ifinfomsg *ifm; 3277 struct net_device *dev; 3278 struct nlattr *br_spec, *attr = NULL; 3279 int rem, err = -EOPNOTSUPP; 3280 u16 flags = 0; 3281 bool have_flags = false; 3282 3283 if (nlmsg_len(nlh) < sizeof(*ifm)) 3284 return -EINVAL; 3285 3286 ifm = nlmsg_data(nlh); 3287 if (ifm->ifi_family != AF_BRIDGE) 3288 return -EPFNOSUPPORT; 3289 3290 dev = __dev_get_by_index(net, ifm->ifi_index); 3291 if (!dev) { 3292 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3293 return -ENODEV; 3294 } 3295 3296 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3297 if (br_spec) { 3298 nla_for_each_nested(attr, br_spec, rem) { 3299 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3300 if (nla_len(attr) < sizeof(flags)) 3301 return -EINVAL; 3302 3303 have_flags = true; 3304 flags = nla_get_u16(attr); 3305 break; 3306 } 3307 } 3308 } 3309 3310 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3311 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3312 3313 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3314 err = -EOPNOTSUPP; 3315 goto out; 3316 } 3317 3318 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3319 if (err) 3320 goto out; 3321 3322 flags &= ~BRIDGE_FLAGS_MASTER; 3323 } 3324 3325 if ((flags & BRIDGE_FLAGS_SELF)) { 3326 if (!dev->netdev_ops->ndo_bridge_dellink) 3327 err = -EOPNOTSUPP; 3328 else 3329 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3330 flags); 3331 3332 if (!err) { 3333 flags &= ~BRIDGE_FLAGS_SELF; 3334 3335 /* Generate event to notify upper layer of bridge 3336 * change 3337 */ 3338 err = rtnl_bridge_notify(dev); 3339 } 3340 } 3341 3342 if (have_flags) 3343 memcpy(nla_data(attr), &flags, sizeof(flags)); 3344 out: 3345 return err; 3346 } 3347 3348 /* Process one rtnetlink message. */ 3349 3350 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3351 { 3352 struct net *net = sock_net(skb->sk); 3353 rtnl_doit_func doit; 3354 int kind; 3355 int family; 3356 int type; 3357 int err; 3358 3359 type = nlh->nlmsg_type; 3360 if (type > RTM_MAX) 3361 return -EOPNOTSUPP; 3362 3363 type -= RTM_BASE; 3364 3365 /* All the messages must have at least 1 byte length */ 3366 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3367 return 0; 3368 3369 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3370 kind = type&3; 3371 3372 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3373 return -EPERM; 3374 3375 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 3376 struct sock *rtnl; 3377 rtnl_dumpit_func dumpit; 3378 rtnl_calcit_func calcit; 3379 u16 min_dump_alloc = 0; 3380 3381 dumpit = rtnl_get_dumpit(family, type); 3382 if (dumpit == NULL) 3383 return -EOPNOTSUPP; 3384 calcit = rtnl_get_calcit(family, type); 3385 if (calcit) 3386 min_dump_alloc = calcit(skb, nlh); 3387 3388 __rtnl_unlock(); 3389 rtnl = net->rtnl; 3390 { 3391 struct netlink_dump_control c = { 3392 .dump = dumpit, 3393 .min_dump_alloc = min_dump_alloc, 3394 }; 3395 err = netlink_dump_start(rtnl, skb, nlh, &c); 3396 } 3397 rtnl_lock(); 3398 return err; 3399 } 3400 3401 doit = rtnl_get_doit(family, type); 3402 if (doit == NULL) 3403 return -EOPNOTSUPP; 3404 3405 return doit(skb, nlh); 3406 } 3407 3408 static void rtnetlink_rcv(struct sk_buff *skb) 3409 { 3410 rtnl_lock(); 3411 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 3412 rtnl_unlock(); 3413 } 3414 3415 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 3416 { 3417 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3418 3419 switch (event) { 3420 case NETDEV_UP: 3421 case NETDEV_DOWN: 3422 case NETDEV_PRE_UP: 3423 case NETDEV_POST_INIT: 3424 case NETDEV_REGISTER: 3425 case NETDEV_CHANGE: 3426 case NETDEV_PRE_TYPE_CHANGE: 3427 case NETDEV_GOING_DOWN: 3428 case NETDEV_UNREGISTER: 3429 case NETDEV_UNREGISTER_FINAL: 3430 case NETDEV_RELEASE: 3431 case NETDEV_JOIN: 3432 case NETDEV_BONDING_INFO: 3433 break; 3434 default: 3435 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3436 break; 3437 } 3438 return NOTIFY_DONE; 3439 } 3440 3441 static struct notifier_block rtnetlink_dev_notifier = { 3442 .notifier_call = rtnetlink_event, 3443 }; 3444 3445 3446 static int __net_init rtnetlink_net_init(struct net *net) 3447 { 3448 struct sock *sk; 3449 struct netlink_kernel_cfg cfg = { 3450 .groups = RTNLGRP_MAX, 3451 .input = rtnetlink_rcv, 3452 .cb_mutex = &rtnl_mutex, 3453 .flags = NL_CFG_F_NONROOT_RECV, 3454 }; 3455 3456 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3457 if (!sk) 3458 return -ENOMEM; 3459 net->rtnl = sk; 3460 return 0; 3461 } 3462 3463 static void __net_exit rtnetlink_net_exit(struct net *net) 3464 { 3465 netlink_kernel_release(net->rtnl); 3466 net->rtnl = NULL; 3467 } 3468 3469 static struct pernet_operations rtnetlink_net_ops = { 3470 .init = rtnetlink_net_init, 3471 .exit = rtnetlink_net_exit, 3472 }; 3473 3474 void __init rtnetlink_init(void) 3475 { 3476 if (register_pernet_subsys(&rtnetlink_net_ops)) 3477 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3478 3479 register_netdevice_notifier(&rtnetlink_dev_notifier); 3480 3481 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3482 rtnl_dump_ifinfo, rtnl_calcit); 3483 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3484 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3485 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3486 3487 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3488 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3489 3490 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3491 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3492 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3493 3494 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3495 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3496 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3497 } 3498