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 a->rx_nohandler = b->rx_nohandler; 809 } 810 811 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 812 { 813 memcpy(v, b, sizeof(*b)); 814 } 815 816 /* All VF info */ 817 static inline int rtnl_vfinfo_size(const struct net_device *dev, 818 u32 ext_filter_mask) 819 { 820 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 821 (ext_filter_mask & RTEXT_FILTER_VF)) { 822 int num_vfs = dev_num_vf(dev->dev.parent); 823 size_t size = nla_total_size(sizeof(struct nlattr)); 824 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 825 size += num_vfs * 826 (nla_total_size(sizeof(struct ifla_vf_mac)) + 827 nla_total_size(sizeof(struct ifla_vf_vlan)) + 828 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 829 nla_total_size(sizeof(struct ifla_vf_rate)) + 830 nla_total_size(sizeof(struct ifla_vf_link_state)) + 831 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 832 /* IFLA_VF_STATS_RX_PACKETS */ 833 nla_total_size(sizeof(__u64)) + 834 /* IFLA_VF_STATS_TX_PACKETS */ 835 nla_total_size(sizeof(__u64)) + 836 /* IFLA_VF_STATS_RX_BYTES */ 837 nla_total_size(sizeof(__u64)) + 838 /* IFLA_VF_STATS_TX_BYTES */ 839 nla_total_size(sizeof(__u64)) + 840 /* IFLA_VF_STATS_BROADCAST */ 841 nla_total_size(sizeof(__u64)) + 842 /* IFLA_VF_STATS_MULTICAST */ 843 nla_total_size(sizeof(__u64)) + 844 nla_total_size(sizeof(struct ifla_vf_trust))); 845 return size; 846 } else 847 return 0; 848 } 849 850 static size_t rtnl_port_size(const struct net_device *dev, 851 u32 ext_filter_mask) 852 { 853 size_t port_size = nla_total_size(4) /* PORT_VF */ 854 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 855 + nla_total_size(sizeof(struct ifla_port_vsi)) 856 /* PORT_VSI_TYPE */ 857 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 858 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 859 + nla_total_size(1) /* PROT_VDP_REQUEST */ 860 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 861 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 862 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 863 + port_size; 864 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 865 + port_size; 866 867 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 868 !(ext_filter_mask & RTEXT_FILTER_VF)) 869 return 0; 870 if (dev_num_vf(dev->dev.parent)) 871 return port_self_size + vf_ports_size + 872 vf_port_size * dev_num_vf(dev->dev.parent); 873 else 874 return port_self_size; 875 } 876 877 static noinline size_t if_nlmsg_size(const struct net_device *dev, 878 u32 ext_filter_mask) 879 { 880 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 881 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 882 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 883 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 884 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 885 + nla_total_size(sizeof(struct rtnl_link_stats)) 886 + nla_total_size(sizeof(struct rtnl_link_stats64)) 887 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 888 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 889 + nla_total_size(4) /* IFLA_TXQLEN */ 890 + nla_total_size(4) /* IFLA_WEIGHT */ 891 + nla_total_size(4) /* IFLA_MTU */ 892 + nla_total_size(4) /* IFLA_LINK */ 893 + nla_total_size(4) /* IFLA_MASTER */ 894 + nla_total_size(1) /* IFLA_CARRIER */ 895 + nla_total_size(4) /* IFLA_PROMISCUITY */ 896 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 897 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 898 + nla_total_size(1) /* IFLA_OPERSTATE */ 899 + nla_total_size(1) /* IFLA_LINKMODE */ 900 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 901 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 902 + nla_total_size(ext_filter_mask 903 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 904 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 905 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 906 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 907 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 908 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 909 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 910 + nla_total_size(1); /* IFLA_PROTO_DOWN */ 911 912 } 913 914 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 915 { 916 struct nlattr *vf_ports; 917 struct nlattr *vf_port; 918 int vf; 919 int err; 920 921 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 922 if (!vf_ports) 923 return -EMSGSIZE; 924 925 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 926 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 927 if (!vf_port) 928 goto nla_put_failure; 929 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 930 goto nla_put_failure; 931 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 932 if (err == -EMSGSIZE) 933 goto nla_put_failure; 934 if (err) { 935 nla_nest_cancel(skb, vf_port); 936 continue; 937 } 938 nla_nest_end(skb, vf_port); 939 } 940 941 nla_nest_end(skb, vf_ports); 942 943 return 0; 944 945 nla_put_failure: 946 nla_nest_cancel(skb, vf_ports); 947 return -EMSGSIZE; 948 } 949 950 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 951 { 952 struct nlattr *port_self; 953 int err; 954 955 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 956 if (!port_self) 957 return -EMSGSIZE; 958 959 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 960 if (err) { 961 nla_nest_cancel(skb, port_self); 962 return (err == -EMSGSIZE) ? err : 0; 963 } 964 965 nla_nest_end(skb, port_self); 966 967 return 0; 968 } 969 970 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 971 u32 ext_filter_mask) 972 { 973 int err; 974 975 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 976 !(ext_filter_mask & RTEXT_FILTER_VF)) 977 return 0; 978 979 err = rtnl_port_self_fill(skb, dev); 980 if (err) 981 return err; 982 983 if (dev_num_vf(dev->dev.parent)) { 984 err = rtnl_vf_ports_fill(skb, dev); 985 if (err) 986 return err; 987 } 988 989 return 0; 990 } 991 992 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 993 { 994 int err; 995 struct netdev_phys_item_id ppid; 996 997 err = dev_get_phys_port_id(dev, &ppid); 998 if (err) { 999 if (err == -EOPNOTSUPP) 1000 return 0; 1001 return err; 1002 } 1003 1004 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1005 return -EMSGSIZE; 1006 1007 return 0; 1008 } 1009 1010 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1011 { 1012 char name[IFNAMSIZ]; 1013 int err; 1014 1015 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1016 if (err) { 1017 if (err == -EOPNOTSUPP) 1018 return 0; 1019 return err; 1020 } 1021 1022 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 1023 return -EMSGSIZE; 1024 1025 return 0; 1026 } 1027 1028 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1029 { 1030 int err; 1031 struct switchdev_attr attr = { 1032 .orig_dev = dev, 1033 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 1034 .flags = SWITCHDEV_F_NO_RECURSE, 1035 }; 1036 1037 err = switchdev_port_attr_get(dev, &attr); 1038 if (err) { 1039 if (err == -EOPNOTSUPP) 1040 return 0; 1041 return err; 1042 } 1043 1044 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1045 attr.u.ppid.id)) 1046 return -EMSGSIZE; 1047 1048 return 0; 1049 } 1050 1051 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1052 struct net_device *dev) 1053 { 1054 const struct rtnl_link_stats64 *stats; 1055 struct rtnl_link_stats64 temp; 1056 struct nlattr *attr; 1057 1058 stats = dev_get_stats(dev, &temp); 1059 1060 attr = nla_reserve(skb, IFLA_STATS, 1061 sizeof(struct rtnl_link_stats)); 1062 if (!attr) 1063 return -EMSGSIZE; 1064 1065 copy_rtnl_link_stats(nla_data(attr), stats); 1066 1067 attr = nla_reserve(skb, IFLA_STATS64, 1068 sizeof(struct rtnl_link_stats64)); 1069 if (!attr) 1070 return -EMSGSIZE; 1071 1072 copy_rtnl_link_stats64(nla_data(attr), stats); 1073 1074 return 0; 1075 } 1076 1077 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1078 struct net_device *dev, 1079 int vfs_num, 1080 struct nlattr *vfinfo) 1081 { 1082 struct ifla_vf_rss_query_en vf_rss_query_en; 1083 struct ifla_vf_link_state vf_linkstate; 1084 struct ifla_vf_spoofchk vf_spoofchk; 1085 struct ifla_vf_tx_rate vf_tx_rate; 1086 struct ifla_vf_stats vf_stats; 1087 struct ifla_vf_trust vf_trust; 1088 struct ifla_vf_vlan vf_vlan; 1089 struct ifla_vf_rate vf_rate; 1090 struct nlattr *vf, *vfstats; 1091 struct ifla_vf_mac vf_mac; 1092 struct ifla_vf_info ivi; 1093 1094 /* Not all SR-IOV capable drivers support the 1095 * spoofcheck and "RSS query enable" query. Preset to 1096 * -1 so the user space tool can detect that the driver 1097 * didn't report anything. 1098 */ 1099 ivi.spoofchk = -1; 1100 ivi.rss_query_en = -1; 1101 ivi.trusted = -1; 1102 memset(ivi.mac, 0, sizeof(ivi.mac)); 1103 /* The default value for VF link state is "auto" 1104 * IFLA_VF_LINK_STATE_AUTO which equals zero 1105 */ 1106 ivi.linkstate = 0; 1107 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1108 return 0; 1109 1110 vf_mac.vf = 1111 vf_vlan.vf = 1112 vf_rate.vf = 1113 vf_tx_rate.vf = 1114 vf_spoofchk.vf = 1115 vf_linkstate.vf = 1116 vf_rss_query_en.vf = 1117 vf_trust.vf = ivi.vf; 1118 1119 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1120 vf_vlan.vlan = ivi.vlan; 1121 vf_vlan.qos = ivi.qos; 1122 vf_tx_rate.rate = ivi.max_tx_rate; 1123 vf_rate.min_tx_rate = ivi.min_tx_rate; 1124 vf_rate.max_tx_rate = ivi.max_tx_rate; 1125 vf_spoofchk.setting = ivi.spoofchk; 1126 vf_linkstate.link_state = ivi.linkstate; 1127 vf_rss_query_en.setting = ivi.rss_query_en; 1128 vf_trust.setting = ivi.trusted; 1129 vf = nla_nest_start(skb, IFLA_VF_INFO); 1130 if (!vf) { 1131 nla_nest_cancel(skb, vfinfo); 1132 return -EMSGSIZE; 1133 } 1134 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1135 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1136 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1137 &vf_rate) || 1138 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1139 &vf_tx_rate) || 1140 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1141 &vf_spoofchk) || 1142 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1143 &vf_linkstate) || 1144 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1145 sizeof(vf_rss_query_en), 1146 &vf_rss_query_en) || 1147 nla_put(skb, IFLA_VF_TRUST, 1148 sizeof(vf_trust), &vf_trust)) 1149 return -EMSGSIZE; 1150 memset(&vf_stats, 0, sizeof(vf_stats)); 1151 if (dev->netdev_ops->ndo_get_vf_stats) 1152 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1153 &vf_stats); 1154 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1155 if (!vfstats) { 1156 nla_nest_cancel(skb, vf); 1157 nla_nest_cancel(skb, vfinfo); 1158 return -EMSGSIZE; 1159 } 1160 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS, 1161 vf_stats.rx_packets) || 1162 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS, 1163 vf_stats.tx_packets) || 1164 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES, 1165 vf_stats.rx_bytes) || 1166 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES, 1167 vf_stats.tx_bytes) || 1168 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST, 1169 vf_stats.broadcast) || 1170 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST, 1171 vf_stats.multicast)) 1172 return -EMSGSIZE; 1173 nla_nest_end(skb, vfstats); 1174 nla_nest_end(skb, vf); 1175 return 0; 1176 } 1177 1178 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1179 { 1180 struct rtnl_link_ifmap map = { 1181 .mem_start = dev->mem_start, 1182 .mem_end = dev->mem_end, 1183 .base_addr = dev->base_addr, 1184 .irq = dev->irq, 1185 .dma = dev->dma, 1186 .port = dev->if_port, 1187 }; 1188 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1189 return -EMSGSIZE; 1190 1191 return 0; 1192 } 1193 1194 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1195 int type, u32 pid, u32 seq, u32 change, 1196 unsigned int flags, u32 ext_filter_mask) 1197 { 1198 struct ifinfomsg *ifm; 1199 struct nlmsghdr *nlh; 1200 struct nlattr *af_spec; 1201 struct rtnl_af_ops *af_ops; 1202 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1203 1204 ASSERT_RTNL(); 1205 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1206 if (nlh == NULL) 1207 return -EMSGSIZE; 1208 1209 ifm = nlmsg_data(nlh); 1210 ifm->ifi_family = AF_UNSPEC; 1211 ifm->__ifi_pad = 0; 1212 ifm->ifi_type = dev->type; 1213 ifm->ifi_index = dev->ifindex; 1214 ifm->ifi_flags = dev_get_flags(dev); 1215 ifm->ifi_change = change; 1216 1217 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1218 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1219 nla_put_u8(skb, IFLA_OPERSTATE, 1220 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1221 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1222 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1223 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1224 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1225 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1226 #ifdef CONFIG_RPS 1227 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1228 #endif 1229 (dev->ifindex != dev_get_iflink(dev) && 1230 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1231 (upper_dev && 1232 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1233 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1234 (dev->qdisc && 1235 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1236 (dev->ifalias && 1237 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1238 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1239 atomic_read(&dev->carrier_changes)) || 1240 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1241 goto nla_put_failure; 1242 1243 if (rtnl_fill_link_ifmap(skb, dev)) 1244 goto nla_put_failure; 1245 1246 if (dev->addr_len) { 1247 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1248 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1249 goto nla_put_failure; 1250 } 1251 1252 if (rtnl_phys_port_id_fill(skb, dev)) 1253 goto nla_put_failure; 1254 1255 if (rtnl_phys_port_name_fill(skb, dev)) 1256 goto nla_put_failure; 1257 1258 if (rtnl_phys_switch_id_fill(skb, dev)) 1259 goto nla_put_failure; 1260 1261 if (rtnl_fill_stats(skb, dev)) 1262 goto nla_put_failure; 1263 1264 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1265 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1266 goto nla_put_failure; 1267 1268 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent && 1269 ext_filter_mask & RTEXT_FILTER_VF) { 1270 int i; 1271 struct nlattr *vfinfo; 1272 int num_vfs = dev_num_vf(dev->dev.parent); 1273 1274 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1275 if (!vfinfo) 1276 goto nla_put_failure; 1277 for (i = 0; i < num_vfs; i++) { 1278 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1279 goto nla_put_failure; 1280 } 1281 1282 nla_nest_end(skb, vfinfo); 1283 } 1284 1285 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1286 goto nla_put_failure; 1287 1288 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1289 if (rtnl_link_fill(skb, dev) < 0) 1290 goto nla_put_failure; 1291 } 1292 1293 if (dev->rtnl_link_ops && 1294 dev->rtnl_link_ops->get_link_net) { 1295 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1296 1297 if (!net_eq(dev_net(dev), link_net)) { 1298 int id = peernet2id_alloc(dev_net(dev), link_net); 1299 1300 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1301 goto nla_put_failure; 1302 } 1303 } 1304 1305 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1306 goto nla_put_failure; 1307 1308 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1309 if (af_ops->fill_link_af) { 1310 struct nlattr *af; 1311 int err; 1312 1313 if (!(af = nla_nest_start(skb, af_ops->family))) 1314 goto nla_put_failure; 1315 1316 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1317 1318 /* 1319 * Caller may return ENODATA to indicate that there 1320 * was no data to be dumped. This is not an error, it 1321 * means we should trim the attribute header and 1322 * continue. 1323 */ 1324 if (err == -ENODATA) 1325 nla_nest_cancel(skb, af); 1326 else if (err < 0) 1327 goto nla_put_failure; 1328 1329 nla_nest_end(skb, af); 1330 } 1331 } 1332 1333 nla_nest_end(skb, af_spec); 1334 1335 nlmsg_end(skb, nlh); 1336 return 0; 1337 1338 nla_put_failure: 1339 nlmsg_cancel(skb, nlh); 1340 return -EMSGSIZE; 1341 } 1342 1343 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1344 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1345 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1346 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1347 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1348 [IFLA_MTU] = { .type = NLA_U32 }, 1349 [IFLA_LINK] = { .type = NLA_U32 }, 1350 [IFLA_MASTER] = { .type = NLA_U32 }, 1351 [IFLA_CARRIER] = { .type = NLA_U8 }, 1352 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1353 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1354 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1355 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1356 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1357 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1358 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1359 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1360 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1361 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1362 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1363 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1364 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1365 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1366 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1367 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1368 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1369 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1370 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1371 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1372 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1373 }; 1374 1375 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1376 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1377 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1378 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1379 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1380 }; 1381 1382 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1383 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1384 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1385 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1386 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1387 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1388 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1389 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1390 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1391 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1392 }; 1393 1394 static const struct nla_policy ifla_vf_stats_policy[IFLA_VF_STATS_MAX + 1] = { 1395 [IFLA_VF_STATS_RX_PACKETS] = { .type = NLA_U64 }, 1396 [IFLA_VF_STATS_TX_PACKETS] = { .type = NLA_U64 }, 1397 [IFLA_VF_STATS_RX_BYTES] = { .type = NLA_U64 }, 1398 [IFLA_VF_STATS_TX_BYTES] = { .type = NLA_U64 }, 1399 [IFLA_VF_STATS_BROADCAST] = { .type = NLA_U64 }, 1400 [IFLA_VF_STATS_MULTICAST] = { .type = NLA_U64 }, 1401 }; 1402 1403 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1404 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1405 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1406 .len = PORT_PROFILE_MAX }, 1407 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1408 .len = sizeof(struct ifla_port_vsi)}, 1409 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1410 .len = PORT_UUID_MAX }, 1411 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1412 .len = PORT_UUID_MAX }, 1413 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1414 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1415 }; 1416 1417 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 1418 { 1419 const struct rtnl_link_ops *ops = NULL; 1420 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 1421 1422 if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0) 1423 return NULL; 1424 1425 if (linfo[IFLA_INFO_KIND]) { 1426 char kind[MODULE_NAME_LEN]; 1427 1428 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 1429 ops = rtnl_link_ops_get(kind); 1430 } 1431 1432 return ops; 1433 } 1434 1435 static bool link_master_filtered(struct net_device *dev, int master_idx) 1436 { 1437 struct net_device *master; 1438 1439 if (!master_idx) 1440 return false; 1441 1442 master = netdev_master_upper_dev_get(dev); 1443 if (!master || master->ifindex != master_idx) 1444 return true; 1445 1446 return false; 1447 } 1448 1449 static bool link_kind_filtered(const struct net_device *dev, 1450 const struct rtnl_link_ops *kind_ops) 1451 { 1452 if (kind_ops && dev->rtnl_link_ops != kind_ops) 1453 return true; 1454 1455 return false; 1456 } 1457 1458 static bool link_dump_filtered(struct net_device *dev, 1459 int master_idx, 1460 const struct rtnl_link_ops *kind_ops) 1461 { 1462 if (link_master_filtered(dev, master_idx) || 1463 link_kind_filtered(dev, kind_ops)) 1464 return true; 1465 1466 return false; 1467 } 1468 1469 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1470 { 1471 struct net *net = sock_net(skb->sk); 1472 int h, s_h; 1473 int idx = 0, s_idx; 1474 struct net_device *dev; 1475 struct hlist_head *head; 1476 struct nlattr *tb[IFLA_MAX+1]; 1477 u32 ext_filter_mask = 0; 1478 const struct rtnl_link_ops *kind_ops = NULL; 1479 unsigned int flags = NLM_F_MULTI; 1480 int master_idx = 0; 1481 int err; 1482 int hdrlen; 1483 1484 s_h = cb->args[0]; 1485 s_idx = cb->args[1]; 1486 1487 cb->seq = net->dev_base_seq; 1488 1489 /* A hack to preserve kernel<->userspace interface. 1490 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1491 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1492 * what iproute2 < v3.9.0 used. 1493 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1494 * attribute, its netlink message is shorter than struct ifinfomsg. 1495 */ 1496 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1497 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1498 1499 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1500 1501 if (tb[IFLA_EXT_MASK]) 1502 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1503 1504 if (tb[IFLA_MASTER]) 1505 master_idx = nla_get_u32(tb[IFLA_MASTER]); 1506 1507 if (tb[IFLA_LINKINFO]) 1508 kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]); 1509 1510 if (master_idx || kind_ops) 1511 flags |= NLM_F_DUMP_FILTERED; 1512 } 1513 1514 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1515 idx = 0; 1516 head = &net->dev_index_head[h]; 1517 hlist_for_each_entry(dev, head, index_hlist) { 1518 if (link_dump_filtered(dev, master_idx, kind_ops)) 1519 continue; 1520 if (idx < s_idx) 1521 goto cont; 1522 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1523 NETLINK_CB(cb->skb).portid, 1524 cb->nlh->nlmsg_seq, 0, 1525 flags, 1526 ext_filter_mask); 1527 /* If we ran out of room on the first message, 1528 * we're in trouble 1529 */ 1530 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1531 1532 if (err < 0) 1533 goto out; 1534 1535 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1536 cont: 1537 idx++; 1538 } 1539 } 1540 out: 1541 cb->args[1] = idx; 1542 cb->args[0] = h; 1543 1544 return skb->len; 1545 } 1546 1547 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1548 { 1549 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1550 } 1551 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1552 1553 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1554 { 1555 struct net *net; 1556 /* Examine the link attributes and figure out which 1557 * network namespace we are talking about. 1558 */ 1559 if (tb[IFLA_NET_NS_PID]) 1560 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1561 else if (tb[IFLA_NET_NS_FD]) 1562 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1563 else 1564 net = get_net(src_net); 1565 return net; 1566 } 1567 EXPORT_SYMBOL(rtnl_link_get_net); 1568 1569 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1570 { 1571 if (dev) { 1572 if (tb[IFLA_ADDRESS] && 1573 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1574 return -EINVAL; 1575 1576 if (tb[IFLA_BROADCAST] && 1577 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1578 return -EINVAL; 1579 } 1580 1581 if (tb[IFLA_AF_SPEC]) { 1582 struct nlattr *af; 1583 int rem, err; 1584 1585 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1586 const struct rtnl_af_ops *af_ops; 1587 1588 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1589 return -EAFNOSUPPORT; 1590 1591 if (!af_ops->set_link_af) 1592 return -EOPNOTSUPP; 1593 1594 if (af_ops->validate_link_af) { 1595 err = af_ops->validate_link_af(dev, af); 1596 if (err < 0) 1597 return err; 1598 } 1599 } 1600 } 1601 1602 return 0; 1603 } 1604 1605 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 1606 { 1607 const struct net_device_ops *ops = dev->netdev_ops; 1608 int err = -EINVAL; 1609 1610 if (tb[IFLA_VF_MAC]) { 1611 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 1612 1613 err = -EOPNOTSUPP; 1614 if (ops->ndo_set_vf_mac) 1615 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1616 ivm->mac); 1617 if (err < 0) 1618 return err; 1619 } 1620 1621 if (tb[IFLA_VF_VLAN]) { 1622 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 1623 1624 err = -EOPNOTSUPP; 1625 if (ops->ndo_set_vf_vlan) 1626 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 1627 ivv->qos); 1628 if (err < 0) 1629 return err; 1630 } 1631 1632 if (tb[IFLA_VF_TX_RATE]) { 1633 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1634 struct ifla_vf_info ivf; 1635 1636 err = -EOPNOTSUPP; 1637 if (ops->ndo_get_vf_config) 1638 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 1639 if (err < 0) 1640 return err; 1641 1642 err = -EOPNOTSUPP; 1643 if (ops->ndo_set_vf_rate) 1644 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1645 ivf.min_tx_rate, 1646 ivt->rate); 1647 if (err < 0) 1648 return err; 1649 } 1650 1651 if (tb[IFLA_VF_RATE]) { 1652 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 1653 1654 err = -EOPNOTSUPP; 1655 if (ops->ndo_set_vf_rate) 1656 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1657 ivt->min_tx_rate, 1658 ivt->max_tx_rate); 1659 if (err < 0) 1660 return err; 1661 } 1662 1663 if (tb[IFLA_VF_SPOOFCHK]) { 1664 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 1665 1666 err = -EOPNOTSUPP; 1667 if (ops->ndo_set_vf_spoofchk) 1668 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1669 ivs->setting); 1670 if (err < 0) 1671 return err; 1672 } 1673 1674 if (tb[IFLA_VF_LINK_STATE]) { 1675 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 1676 1677 err = -EOPNOTSUPP; 1678 if (ops->ndo_set_vf_link_state) 1679 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1680 ivl->link_state); 1681 if (err < 0) 1682 return err; 1683 } 1684 1685 if (tb[IFLA_VF_RSS_QUERY_EN]) { 1686 struct ifla_vf_rss_query_en *ivrssq_en; 1687 1688 err = -EOPNOTSUPP; 1689 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 1690 if (ops->ndo_set_vf_rss_query_en) 1691 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 1692 ivrssq_en->setting); 1693 if (err < 0) 1694 return err; 1695 } 1696 1697 if (tb[IFLA_VF_TRUST]) { 1698 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 1699 1700 err = -EOPNOTSUPP; 1701 if (ops->ndo_set_vf_trust) 1702 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 1703 if (err < 0) 1704 return err; 1705 } 1706 1707 return err; 1708 } 1709 1710 static int do_set_master(struct net_device *dev, int ifindex) 1711 { 1712 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1713 const struct net_device_ops *ops; 1714 int err; 1715 1716 if (upper_dev) { 1717 if (upper_dev->ifindex == ifindex) 1718 return 0; 1719 ops = upper_dev->netdev_ops; 1720 if (ops->ndo_del_slave) { 1721 err = ops->ndo_del_slave(upper_dev, dev); 1722 if (err) 1723 return err; 1724 } else { 1725 return -EOPNOTSUPP; 1726 } 1727 } 1728 1729 if (ifindex) { 1730 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1731 if (!upper_dev) 1732 return -EINVAL; 1733 ops = upper_dev->netdev_ops; 1734 if (ops->ndo_add_slave) { 1735 err = ops->ndo_add_slave(upper_dev, dev); 1736 if (err) 1737 return err; 1738 } else { 1739 return -EOPNOTSUPP; 1740 } 1741 } 1742 return 0; 1743 } 1744 1745 #define DO_SETLINK_MODIFIED 0x01 1746 /* notify flag means notify + modified. */ 1747 #define DO_SETLINK_NOTIFY 0x03 1748 static int do_setlink(const struct sk_buff *skb, 1749 struct net_device *dev, struct ifinfomsg *ifm, 1750 struct nlattr **tb, char *ifname, int status) 1751 { 1752 const struct net_device_ops *ops = dev->netdev_ops; 1753 int err; 1754 1755 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1756 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1757 if (IS_ERR(net)) { 1758 err = PTR_ERR(net); 1759 goto errout; 1760 } 1761 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1762 put_net(net); 1763 err = -EPERM; 1764 goto errout; 1765 } 1766 err = dev_change_net_namespace(dev, net, ifname); 1767 put_net(net); 1768 if (err) 1769 goto errout; 1770 status |= DO_SETLINK_MODIFIED; 1771 } 1772 1773 if (tb[IFLA_MAP]) { 1774 struct rtnl_link_ifmap *u_map; 1775 struct ifmap k_map; 1776 1777 if (!ops->ndo_set_config) { 1778 err = -EOPNOTSUPP; 1779 goto errout; 1780 } 1781 1782 if (!netif_device_present(dev)) { 1783 err = -ENODEV; 1784 goto errout; 1785 } 1786 1787 u_map = nla_data(tb[IFLA_MAP]); 1788 k_map.mem_start = (unsigned long) u_map->mem_start; 1789 k_map.mem_end = (unsigned long) u_map->mem_end; 1790 k_map.base_addr = (unsigned short) u_map->base_addr; 1791 k_map.irq = (unsigned char) u_map->irq; 1792 k_map.dma = (unsigned char) u_map->dma; 1793 k_map.port = (unsigned char) u_map->port; 1794 1795 err = ops->ndo_set_config(dev, &k_map); 1796 if (err < 0) 1797 goto errout; 1798 1799 status |= DO_SETLINK_NOTIFY; 1800 } 1801 1802 if (tb[IFLA_ADDRESS]) { 1803 struct sockaddr *sa; 1804 int len; 1805 1806 len = sizeof(sa_family_t) + dev->addr_len; 1807 sa = kmalloc(len, GFP_KERNEL); 1808 if (!sa) { 1809 err = -ENOMEM; 1810 goto errout; 1811 } 1812 sa->sa_family = dev->type; 1813 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1814 dev->addr_len); 1815 err = dev_set_mac_address(dev, sa); 1816 kfree(sa); 1817 if (err) 1818 goto errout; 1819 status |= DO_SETLINK_MODIFIED; 1820 } 1821 1822 if (tb[IFLA_MTU]) { 1823 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1824 if (err < 0) 1825 goto errout; 1826 status |= DO_SETLINK_MODIFIED; 1827 } 1828 1829 if (tb[IFLA_GROUP]) { 1830 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1831 status |= DO_SETLINK_NOTIFY; 1832 } 1833 1834 /* 1835 * Interface selected by interface index but interface 1836 * name provided implies that a name change has been 1837 * requested. 1838 */ 1839 if (ifm->ifi_index > 0 && ifname[0]) { 1840 err = dev_change_name(dev, ifname); 1841 if (err < 0) 1842 goto errout; 1843 status |= DO_SETLINK_MODIFIED; 1844 } 1845 1846 if (tb[IFLA_IFALIAS]) { 1847 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1848 nla_len(tb[IFLA_IFALIAS])); 1849 if (err < 0) 1850 goto errout; 1851 status |= DO_SETLINK_NOTIFY; 1852 } 1853 1854 if (tb[IFLA_BROADCAST]) { 1855 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1856 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1857 } 1858 1859 if (ifm->ifi_flags || ifm->ifi_change) { 1860 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1861 if (err < 0) 1862 goto errout; 1863 } 1864 1865 if (tb[IFLA_MASTER]) { 1866 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1867 if (err) 1868 goto errout; 1869 status |= DO_SETLINK_MODIFIED; 1870 } 1871 1872 if (tb[IFLA_CARRIER]) { 1873 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1874 if (err) 1875 goto errout; 1876 status |= DO_SETLINK_MODIFIED; 1877 } 1878 1879 if (tb[IFLA_TXQLEN]) { 1880 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1881 1882 if (dev->tx_queue_len ^ value) 1883 status |= DO_SETLINK_NOTIFY; 1884 1885 dev->tx_queue_len = value; 1886 } 1887 1888 if (tb[IFLA_OPERSTATE]) 1889 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1890 1891 if (tb[IFLA_LINKMODE]) { 1892 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1893 1894 write_lock_bh(&dev_base_lock); 1895 if (dev->link_mode ^ value) 1896 status |= DO_SETLINK_NOTIFY; 1897 dev->link_mode = value; 1898 write_unlock_bh(&dev_base_lock); 1899 } 1900 1901 if (tb[IFLA_VFINFO_LIST]) { 1902 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 1903 struct nlattr *attr; 1904 int rem; 1905 1906 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1907 if (nla_type(attr) != IFLA_VF_INFO || 1908 nla_len(attr) < NLA_HDRLEN) { 1909 err = -EINVAL; 1910 goto errout; 1911 } 1912 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 1913 ifla_vf_policy); 1914 if (err < 0) 1915 goto errout; 1916 err = do_setvfinfo(dev, vfinfo); 1917 if (err < 0) 1918 goto errout; 1919 status |= DO_SETLINK_NOTIFY; 1920 } 1921 } 1922 err = 0; 1923 1924 if (tb[IFLA_VF_PORTS]) { 1925 struct nlattr *port[IFLA_PORT_MAX+1]; 1926 struct nlattr *attr; 1927 int vf; 1928 int rem; 1929 1930 err = -EOPNOTSUPP; 1931 if (!ops->ndo_set_vf_port) 1932 goto errout; 1933 1934 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1935 if (nla_type(attr) != IFLA_VF_PORT || 1936 nla_len(attr) < NLA_HDRLEN) { 1937 err = -EINVAL; 1938 goto errout; 1939 } 1940 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 1941 ifla_port_policy); 1942 if (err < 0) 1943 goto errout; 1944 if (!port[IFLA_PORT_VF]) { 1945 err = -EOPNOTSUPP; 1946 goto errout; 1947 } 1948 vf = nla_get_u32(port[IFLA_PORT_VF]); 1949 err = ops->ndo_set_vf_port(dev, vf, port); 1950 if (err < 0) 1951 goto errout; 1952 status |= DO_SETLINK_NOTIFY; 1953 } 1954 } 1955 err = 0; 1956 1957 if (tb[IFLA_PORT_SELF]) { 1958 struct nlattr *port[IFLA_PORT_MAX+1]; 1959 1960 err = nla_parse_nested(port, IFLA_PORT_MAX, 1961 tb[IFLA_PORT_SELF], ifla_port_policy); 1962 if (err < 0) 1963 goto errout; 1964 1965 err = -EOPNOTSUPP; 1966 if (ops->ndo_set_vf_port) 1967 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1968 if (err < 0) 1969 goto errout; 1970 status |= DO_SETLINK_NOTIFY; 1971 } 1972 1973 if (tb[IFLA_AF_SPEC]) { 1974 struct nlattr *af; 1975 int rem; 1976 1977 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1978 const struct rtnl_af_ops *af_ops; 1979 1980 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1981 BUG(); 1982 1983 err = af_ops->set_link_af(dev, af); 1984 if (err < 0) 1985 goto errout; 1986 1987 status |= DO_SETLINK_NOTIFY; 1988 } 1989 } 1990 err = 0; 1991 1992 if (tb[IFLA_PROTO_DOWN]) { 1993 err = dev_change_proto_down(dev, 1994 nla_get_u8(tb[IFLA_PROTO_DOWN])); 1995 if (err) 1996 goto errout; 1997 status |= DO_SETLINK_NOTIFY; 1998 } 1999 2000 errout: 2001 if (status & DO_SETLINK_MODIFIED) { 2002 if (status & DO_SETLINK_NOTIFY) 2003 netdev_state_change(dev); 2004 2005 if (err < 0) 2006 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", 2007 dev->name); 2008 } 2009 2010 return err; 2011 } 2012 2013 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2014 { 2015 struct net *net = sock_net(skb->sk); 2016 struct ifinfomsg *ifm; 2017 struct net_device *dev; 2018 int err; 2019 struct nlattr *tb[IFLA_MAX+1]; 2020 char ifname[IFNAMSIZ]; 2021 2022 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2023 if (err < 0) 2024 goto errout; 2025 2026 if (tb[IFLA_IFNAME]) 2027 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2028 else 2029 ifname[0] = '\0'; 2030 2031 err = -EINVAL; 2032 ifm = nlmsg_data(nlh); 2033 if (ifm->ifi_index > 0) 2034 dev = __dev_get_by_index(net, ifm->ifi_index); 2035 else if (tb[IFLA_IFNAME]) 2036 dev = __dev_get_by_name(net, ifname); 2037 else 2038 goto errout; 2039 2040 if (dev == NULL) { 2041 err = -ENODEV; 2042 goto errout; 2043 } 2044 2045 err = validate_linkmsg(dev, tb); 2046 if (err < 0) 2047 goto errout; 2048 2049 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 2050 errout: 2051 return err; 2052 } 2053 2054 static int rtnl_group_dellink(const struct net *net, int group) 2055 { 2056 struct net_device *dev, *aux; 2057 LIST_HEAD(list_kill); 2058 bool found = false; 2059 2060 if (!group) 2061 return -EPERM; 2062 2063 for_each_netdev(net, dev) { 2064 if (dev->group == group) { 2065 const struct rtnl_link_ops *ops; 2066 2067 found = true; 2068 ops = dev->rtnl_link_ops; 2069 if (!ops || !ops->dellink) 2070 return -EOPNOTSUPP; 2071 } 2072 } 2073 2074 if (!found) 2075 return -ENODEV; 2076 2077 for_each_netdev_safe(net, dev, aux) { 2078 if (dev->group == group) { 2079 const struct rtnl_link_ops *ops; 2080 2081 ops = dev->rtnl_link_ops; 2082 ops->dellink(dev, &list_kill); 2083 } 2084 } 2085 unregister_netdevice_many(&list_kill); 2086 2087 return 0; 2088 } 2089 2090 int rtnl_delete_link(struct net_device *dev) 2091 { 2092 const struct rtnl_link_ops *ops; 2093 LIST_HEAD(list_kill); 2094 2095 ops = dev->rtnl_link_ops; 2096 if (!ops || !ops->dellink) 2097 return -EOPNOTSUPP; 2098 2099 ops->dellink(dev, &list_kill); 2100 unregister_netdevice_many(&list_kill); 2101 2102 return 0; 2103 } 2104 EXPORT_SYMBOL_GPL(rtnl_delete_link); 2105 2106 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2107 { 2108 struct net *net = sock_net(skb->sk); 2109 struct net_device *dev; 2110 struct ifinfomsg *ifm; 2111 char ifname[IFNAMSIZ]; 2112 struct nlattr *tb[IFLA_MAX+1]; 2113 int err; 2114 2115 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2116 if (err < 0) 2117 return err; 2118 2119 if (tb[IFLA_IFNAME]) 2120 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2121 2122 ifm = nlmsg_data(nlh); 2123 if (ifm->ifi_index > 0) 2124 dev = __dev_get_by_index(net, ifm->ifi_index); 2125 else if (tb[IFLA_IFNAME]) 2126 dev = __dev_get_by_name(net, ifname); 2127 else if (tb[IFLA_GROUP]) 2128 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 2129 else 2130 return -EINVAL; 2131 2132 if (!dev) 2133 return -ENODEV; 2134 2135 return rtnl_delete_link(dev); 2136 } 2137 2138 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 2139 { 2140 unsigned int old_flags; 2141 int err; 2142 2143 old_flags = dev->flags; 2144 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2145 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2146 if (err < 0) 2147 return err; 2148 } 2149 2150 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2151 2152 __dev_notify_flags(dev, old_flags, ~0U); 2153 return 0; 2154 } 2155 EXPORT_SYMBOL(rtnl_configure_link); 2156 2157 struct net_device *rtnl_create_link(struct net *net, 2158 const char *ifname, unsigned char name_assign_type, 2159 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2160 { 2161 int err; 2162 struct net_device *dev; 2163 unsigned int num_tx_queues = 1; 2164 unsigned int num_rx_queues = 1; 2165 2166 if (tb[IFLA_NUM_TX_QUEUES]) 2167 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2168 else if (ops->get_num_tx_queues) 2169 num_tx_queues = ops->get_num_tx_queues(); 2170 2171 if (tb[IFLA_NUM_RX_QUEUES]) 2172 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2173 else if (ops->get_num_rx_queues) 2174 num_rx_queues = ops->get_num_rx_queues(); 2175 2176 err = -ENOMEM; 2177 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2178 ops->setup, num_tx_queues, num_rx_queues); 2179 if (!dev) 2180 goto err; 2181 2182 dev_net_set(dev, net); 2183 dev->rtnl_link_ops = ops; 2184 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2185 2186 if (tb[IFLA_MTU]) 2187 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2188 if (tb[IFLA_ADDRESS]) { 2189 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2190 nla_len(tb[IFLA_ADDRESS])); 2191 dev->addr_assign_type = NET_ADDR_SET; 2192 } 2193 if (tb[IFLA_BROADCAST]) 2194 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2195 nla_len(tb[IFLA_BROADCAST])); 2196 if (tb[IFLA_TXQLEN]) 2197 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2198 if (tb[IFLA_OPERSTATE]) 2199 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2200 if (tb[IFLA_LINKMODE]) 2201 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2202 if (tb[IFLA_GROUP]) 2203 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2204 2205 return dev; 2206 2207 err: 2208 return ERR_PTR(err); 2209 } 2210 EXPORT_SYMBOL(rtnl_create_link); 2211 2212 static int rtnl_group_changelink(const struct sk_buff *skb, 2213 struct net *net, int group, 2214 struct ifinfomsg *ifm, 2215 struct nlattr **tb) 2216 { 2217 struct net_device *dev, *aux; 2218 int err; 2219 2220 for_each_netdev_safe(net, dev, aux) { 2221 if (dev->group == group) { 2222 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2223 if (err < 0) 2224 return err; 2225 } 2226 } 2227 2228 return 0; 2229 } 2230 2231 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2232 { 2233 struct net *net = sock_net(skb->sk); 2234 const struct rtnl_link_ops *ops; 2235 const struct rtnl_link_ops *m_ops = NULL; 2236 struct net_device *dev; 2237 struct net_device *master_dev = NULL; 2238 struct ifinfomsg *ifm; 2239 char kind[MODULE_NAME_LEN]; 2240 char ifname[IFNAMSIZ]; 2241 struct nlattr *tb[IFLA_MAX+1]; 2242 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2243 unsigned char name_assign_type = NET_NAME_USER; 2244 int err; 2245 2246 #ifdef CONFIG_MODULES 2247 replay: 2248 #endif 2249 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2250 if (err < 0) 2251 return err; 2252 2253 if (tb[IFLA_IFNAME]) 2254 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2255 else 2256 ifname[0] = '\0'; 2257 2258 ifm = nlmsg_data(nlh); 2259 if (ifm->ifi_index > 0) 2260 dev = __dev_get_by_index(net, ifm->ifi_index); 2261 else { 2262 if (ifname[0]) 2263 dev = __dev_get_by_name(net, ifname); 2264 else 2265 dev = NULL; 2266 } 2267 2268 if (dev) { 2269 master_dev = netdev_master_upper_dev_get(dev); 2270 if (master_dev) 2271 m_ops = master_dev->rtnl_link_ops; 2272 } 2273 2274 err = validate_linkmsg(dev, tb); 2275 if (err < 0) 2276 return err; 2277 2278 if (tb[IFLA_LINKINFO]) { 2279 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2280 tb[IFLA_LINKINFO], ifla_info_policy); 2281 if (err < 0) 2282 return err; 2283 } else 2284 memset(linkinfo, 0, sizeof(linkinfo)); 2285 2286 if (linkinfo[IFLA_INFO_KIND]) { 2287 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2288 ops = rtnl_link_ops_get(kind); 2289 } else { 2290 kind[0] = '\0'; 2291 ops = NULL; 2292 } 2293 2294 if (1) { 2295 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2296 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2297 struct nlattr **data = NULL; 2298 struct nlattr **slave_data = NULL; 2299 struct net *dest_net, *link_net = NULL; 2300 2301 if (ops) { 2302 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2303 err = nla_parse_nested(attr, ops->maxtype, 2304 linkinfo[IFLA_INFO_DATA], 2305 ops->policy); 2306 if (err < 0) 2307 return err; 2308 data = attr; 2309 } 2310 if (ops->validate) { 2311 err = ops->validate(tb, data); 2312 if (err < 0) 2313 return err; 2314 } 2315 } 2316 2317 if (m_ops) { 2318 if (m_ops->slave_maxtype && 2319 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2320 err = nla_parse_nested(slave_attr, 2321 m_ops->slave_maxtype, 2322 linkinfo[IFLA_INFO_SLAVE_DATA], 2323 m_ops->slave_policy); 2324 if (err < 0) 2325 return err; 2326 slave_data = slave_attr; 2327 } 2328 if (m_ops->slave_validate) { 2329 err = m_ops->slave_validate(tb, slave_data); 2330 if (err < 0) 2331 return err; 2332 } 2333 } 2334 2335 if (dev) { 2336 int status = 0; 2337 2338 if (nlh->nlmsg_flags & NLM_F_EXCL) 2339 return -EEXIST; 2340 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2341 return -EOPNOTSUPP; 2342 2343 if (linkinfo[IFLA_INFO_DATA]) { 2344 if (!ops || ops != dev->rtnl_link_ops || 2345 !ops->changelink) 2346 return -EOPNOTSUPP; 2347 2348 err = ops->changelink(dev, tb, data); 2349 if (err < 0) 2350 return err; 2351 status |= DO_SETLINK_NOTIFY; 2352 } 2353 2354 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2355 if (!m_ops || !m_ops->slave_changelink) 2356 return -EOPNOTSUPP; 2357 2358 err = m_ops->slave_changelink(master_dev, dev, 2359 tb, slave_data); 2360 if (err < 0) 2361 return err; 2362 status |= DO_SETLINK_NOTIFY; 2363 } 2364 2365 return do_setlink(skb, dev, ifm, tb, ifname, status); 2366 } 2367 2368 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2369 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2370 return rtnl_group_changelink(skb, net, 2371 nla_get_u32(tb[IFLA_GROUP]), 2372 ifm, tb); 2373 return -ENODEV; 2374 } 2375 2376 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2377 return -EOPNOTSUPP; 2378 2379 if (!ops) { 2380 #ifdef CONFIG_MODULES 2381 if (kind[0]) { 2382 __rtnl_unlock(); 2383 request_module("rtnl-link-%s", kind); 2384 rtnl_lock(); 2385 ops = rtnl_link_ops_get(kind); 2386 if (ops) 2387 goto replay; 2388 } 2389 #endif 2390 return -EOPNOTSUPP; 2391 } 2392 2393 if (!ops->setup) 2394 return -EOPNOTSUPP; 2395 2396 if (!ifname[0]) { 2397 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2398 name_assign_type = NET_NAME_ENUM; 2399 } 2400 2401 dest_net = rtnl_link_get_net(net, tb); 2402 if (IS_ERR(dest_net)) 2403 return PTR_ERR(dest_net); 2404 2405 err = -EPERM; 2406 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2407 goto out; 2408 2409 if (tb[IFLA_LINK_NETNSID]) { 2410 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2411 2412 link_net = get_net_ns_by_id(dest_net, id); 2413 if (!link_net) { 2414 err = -EINVAL; 2415 goto out; 2416 } 2417 err = -EPERM; 2418 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2419 goto out; 2420 } 2421 2422 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2423 name_assign_type, ops, tb); 2424 if (IS_ERR(dev)) { 2425 err = PTR_ERR(dev); 2426 goto out; 2427 } 2428 2429 dev->ifindex = ifm->ifi_index; 2430 2431 if (ops->newlink) { 2432 err = ops->newlink(link_net ? : net, dev, tb, data); 2433 /* Drivers should call free_netdev() in ->destructor 2434 * and unregister it on failure after registration 2435 * so that device could be finally freed in rtnl_unlock. 2436 */ 2437 if (err < 0) { 2438 /* If device is not registered at all, free it now */ 2439 if (dev->reg_state == NETREG_UNINITIALIZED) 2440 free_netdev(dev); 2441 goto out; 2442 } 2443 } else { 2444 err = register_netdevice(dev); 2445 if (err < 0) { 2446 free_netdev(dev); 2447 goto out; 2448 } 2449 } 2450 err = rtnl_configure_link(dev, ifm); 2451 if (err < 0) 2452 goto out_unregister; 2453 if (link_net) { 2454 err = dev_change_net_namespace(dev, dest_net, ifname); 2455 if (err < 0) 2456 goto out_unregister; 2457 } 2458 out: 2459 if (link_net) 2460 put_net(link_net); 2461 put_net(dest_net); 2462 return err; 2463 out_unregister: 2464 if (ops->newlink) { 2465 LIST_HEAD(list_kill); 2466 2467 ops->dellink(dev, &list_kill); 2468 unregister_netdevice_many(&list_kill); 2469 } else { 2470 unregister_netdevice(dev); 2471 } 2472 goto out; 2473 } 2474 } 2475 2476 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2477 { 2478 struct net *net = sock_net(skb->sk); 2479 struct ifinfomsg *ifm; 2480 char ifname[IFNAMSIZ]; 2481 struct nlattr *tb[IFLA_MAX+1]; 2482 struct net_device *dev = NULL; 2483 struct sk_buff *nskb; 2484 int err; 2485 u32 ext_filter_mask = 0; 2486 2487 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2488 if (err < 0) 2489 return err; 2490 2491 if (tb[IFLA_IFNAME]) 2492 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2493 2494 if (tb[IFLA_EXT_MASK]) 2495 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2496 2497 ifm = nlmsg_data(nlh); 2498 if (ifm->ifi_index > 0) 2499 dev = __dev_get_by_index(net, ifm->ifi_index); 2500 else if (tb[IFLA_IFNAME]) 2501 dev = __dev_get_by_name(net, ifname); 2502 else 2503 return -EINVAL; 2504 2505 if (dev == NULL) 2506 return -ENODEV; 2507 2508 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2509 if (nskb == NULL) 2510 return -ENOBUFS; 2511 2512 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2513 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2514 if (err < 0) { 2515 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2516 WARN_ON(err == -EMSGSIZE); 2517 kfree_skb(nskb); 2518 } else 2519 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2520 2521 return err; 2522 } 2523 2524 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2525 { 2526 struct net *net = sock_net(skb->sk); 2527 struct net_device *dev; 2528 struct nlattr *tb[IFLA_MAX+1]; 2529 u32 ext_filter_mask = 0; 2530 u16 min_ifinfo_dump_size = 0; 2531 int hdrlen; 2532 2533 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2534 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2535 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2536 2537 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2538 if (tb[IFLA_EXT_MASK]) 2539 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2540 } 2541 2542 if (!ext_filter_mask) 2543 return NLMSG_GOODSIZE; 2544 /* 2545 * traverse the list of net devices and compute the minimum 2546 * buffer size based upon the filter mask. 2547 */ 2548 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2549 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2550 if_nlmsg_size(dev, 2551 ext_filter_mask)); 2552 } 2553 2554 return min_ifinfo_dump_size; 2555 } 2556 2557 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2558 { 2559 int idx; 2560 int s_idx = cb->family; 2561 2562 if (s_idx == 0) 2563 s_idx = 1; 2564 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2565 int type = cb->nlh->nlmsg_type-RTM_BASE; 2566 if (idx < s_idx || idx == PF_PACKET) 2567 continue; 2568 if (rtnl_msg_handlers[idx] == NULL || 2569 rtnl_msg_handlers[idx][type].dumpit == NULL) 2570 continue; 2571 if (idx > s_idx) { 2572 memset(&cb->args[0], 0, sizeof(cb->args)); 2573 cb->prev_seq = 0; 2574 cb->seq = 0; 2575 } 2576 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2577 break; 2578 } 2579 cb->family = idx; 2580 2581 return skb->len; 2582 } 2583 2584 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2585 unsigned int change, gfp_t flags) 2586 { 2587 struct net *net = dev_net(dev); 2588 struct sk_buff *skb; 2589 int err = -ENOBUFS; 2590 size_t if_info_size; 2591 2592 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2593 if (skb == NULL) 2594 goto errout; 2595 2596 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2597 if (err < 0) { 2598 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2599 WARN_ON(err == -EMSGSIZE); 2600 kfree_skb(skb); 2601 goto errout; 2602 } 2603 return skb; 2604 errout: 2605 if (err < 0) 2606 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2607 return NULL; 2608 } 2609 2610 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2611 { 2612 struct net *net = dev_net(dev); 2613 2614 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2615 } 2616 2617 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2618 gfp_t flags) 2619 { 2620 struct sk_buff *skb; 2621 2622 if (dev->reg_state != NETREG_REGISTERED) 2623 return; 2624 2625 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2626 if (skb) 2627 rtmsg_ifinfo_send(skb, dev, flags); 2628 } 2629 EXPORT_SYMBOL(rtmsg_ifinfo); 2630 2631 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2632 struct net_device *dev, 2633 u8 *addr, u16 vid, u32 pid, u32 seq, 2634 int type, unsigned int flags, 2635 int nlflags, u16 ndm_state) 2636 { 2637 struct nlmsghdr *nlh; 2638 struct ndmsg *ndm; 2639 2640 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2641 if (!nlh) 2642 return -EMSGSIZE; 2643 2644 ndm = nlmsg_data(nlh); 2645 ndm->ndm_family = AF_BRIDGE; 2646 ndm->ndm_pad1 = 0; 2647 ndm->ndm_pad2 = 0; 2648 ndm->ndm_flags = flags; 2649 ndm->ndm_type = 0; 2650 ndm->ndm_ifindex = dev->ifindex; 2651 ndm->ndm_state = ndm_state; 2652 2653 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2654 goto nla_put_failure; 2655 if (vid) 2656 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2657 goto nla_put_failure; 2658 2659 nlmsg_end(skb, nlh); 2660 return 0; 2661 2662 nla_put_failure: 2663 nlmsg_cancel(skb, nlh); 2664 return -EMSGSIZE; 2665 } 2666 2667 static inline size_t rtnl_fdb_nlmsg_size(void) 2668 { 2669 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2670 } 2671 2672 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 2673 u16 ndm_state) 2674 { 2675 struct net *net = dev_net(dev); 2676 struct sk_buff *skb; 2677 int err = -ENOBUFS; 2678 2679 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2680 if (!skb) 2681 goto errout; 2682 2683 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2684 0, 0, type, NTF_SELF, 0, ndm_state); 2685 if (err < 0) { 2686 kfree_skb(skb); 2687 goto errout; 2688 } 2689 2690 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2691 return; 2692 errout: 2693 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2694 } 2695 2696 /** 2697 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2698 */ 2699 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2700 struct nlattr *tb[], 2701 struct net_device *dev, 2702 const unsigned char *addr, u16 vid, 2703 u16 flags) 2704 { 2705 int err = -EINVAL; 2706 2707 /* If aging addresses are supported device will need to 2708 * implement its own handler for this. 2709 */ 2710 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2711 pr_info("%s: FDB only supports static addresses\n", dev->name); 2712 return err; 2713 } 2714 2715 if (vid) { 2716 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2717 return err; 2718 } 2719 2720 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2721 err = dev_uc_add_excl(dev, addr); 2722 else if (is_multicast_ether_addr(addr)) 2723 err = dev_mc_add_excl(dev, addr); 2724 2725 /* Only return duplicate errors if NLM_F_EXCL is set */ 2726 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2727 err = 0; 2728 2729 return err; 2730 } 2731 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2732 2733 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2734 { 2735 u16 vid = 0; 2736 2737 if (vlan_attr) { 2738 if (nla_len(vlan_attr) != sizeof(u16)) { 2739 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2740 return -EINVAL; 2741 } 2742 2743 vid = nla_get_u16(vlan_attr); 2744 2745 if (!vid || vid >= VLAN_VID_MASK) { 2746 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2747 vid); 2748 return -EINVAL; 2749 } 2750 } 2751 *p_vid = vid; 2752 return 0; 2753 } 2754 2755 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2756 { 2757 struct net *net = sock_net(skb->sk); 2758 struct ndmsg *ndm; 2759 struct nlattr *tb[NDA_MAX+1]; 2760 struct net_device *dev; 2761 u8 *addr; 2762 u16 vid; 2763 int err; 2764 2765 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2766 if (err < 0) 2767 return err; 2768 2769 ndm = nlmsg_data(nlh); 2770 if (ndm->ndm_ifindex == 0) { 2771 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2772 return -EINVAL; 2773 } 2774 2775 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2776 if (dev == NULL) { 2777 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2778 return -ENODEV; 2779 } 2780 2781 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2782 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2783 return -EINVAL; 2784 } 2785 2786 addr = nla_data(tb[NDA_LLADDR]); 2787 2788 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2789 if (err) 2790 return err; 2791 2792 err = -EOPNOTSUPP; 2793 2794 /* Support fdb on master device the net/bridge default case */ 2795 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2796 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2797 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2798 const struct net_device_ops *ops = br_dev->netdev_ops; 2799 2800 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2801 nlh->nlmsg_flags); 2802 if (err) 2803 goto out; 2804 else 2805 ndm->ndm_flags &= ~NTF_MASTER; 2806 } 2807 2808 /* Embedded bridge, macvlan, and any other device support */ 2809 if ((ndm->ndm_flags & NTF_SELF)) { 2810 if (dev->netdev_ops->ndo_fdb_add) 2811 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2812 vid, 2813 nlh->nlmsg_flags); 2814 else 2815 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 2816 nlh->nlmsg_flags); 2817 2818 if (!err) { 2819 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 2820 ndm->ndm_state); 2821 ndm->ndm_flags &= ~NTF_SELF; 2822 } 2823 } 2824 out: 2825 return err; 2826 } 2827 2828 /** 2829 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2830 */ 2831 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2832 struct nlattr *tb[], 2833 struct net_device *dev, 2834 const unsigned char *addr, u16 vid) 2835 { 2836 int err = -EINVAL; 2837 2838 /* If aging addresses are supported device will need to 2839 * implement its own handler for this. 2840 */ 2841 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2842 pr_info("%s: FDB only supports static addresses\n", dev->name); 2843 return err; 2844 } 2845 2846 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2847 err = dev_uc_del(dev, addr); 2848 else if (is_multicast_ether_addr(addr)) 2849 err = dev_mc_del(dev, addr); 2850 2851 return err; 2852 } 2853 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2854 2855 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2856 { 2857 struct net *net = sock_net(skb->sk); 2858 struct ndmsg *ndm; 2859 struct nlattr *tb[NDA_MAX+1]; 2860 struct net_device *dev; 2861 int err = -EINVAL; 2862 __u8 *addr; 2863 u16 vid; 2864 2865 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2866 return -EPERM; 2867 2868 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2869 if (err < 0) 2870 return err; 2871 2872 ndm = nlmsg_data(nlh); 2873 if (ndm->ndm_ifindex == 0) { 2874 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2875 return -EINVAL; 2876 } 2877 2878 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2879 if (dev == NULL) { 2880 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2881 return -ENODEV; 2882 } 2883 2884 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2885 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2886 return -EINVAL; 2887 } 2888 2889 addr = nla_data(tb[NDA_LLADDR]); 2890 2891 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2892 if (err) 2893 return err; 2894 2895 err = -EOPNOTSUPP; 2896 2897 /* Support fdb on master device the net/bridge default case */ 2898 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2899 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2900 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2901 const struct net_device_ops *ops = br_dev->netdev_ops; 2902 2903 if (ops->ndo_fdb_del) 2904 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 2905 2906 if (err) 2907 goto out; 2908 else 2909 ndm->ndm_flags &= ~NTF_MASTER; 2910 } 2911 2912 /* Embedded bridge, macvlan, and any other device support */ 2913 if (ndm->ndm_flags & NTF_SELF) { 2914 if (dev->netdev_ops->ndo_fdb_del) 2915 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 2916 vid); 2917 else 2918 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 2919 2920 if (!err) { 2921 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 2922 ndm->ndm_state); 2923 ndm->ndm_flags &= ~NTF_SELF; 2924 } 2925 } 2926 out: 2927 return err; 2928 } 2929 2930 static int nlmsg_populate_fdb(struct sk_buff *skb, 2931 struct netlink_callback *cb, 2932 struct net_device *dev, 2933 int *idx, 2934 struct netdev_hw_addr_list *list) 2935 { 2936 struct netdev_hw_addr *ha; 2937 int err; 2938 u32 portid, seq; 2939 2940 portid = NETLINK_CB(cb->skb).portid; 2941 seq = cb->nlh->nlmsg_seq; 2942 2943 list_for_each_entry(ha, &list->list, list) { 2944 if (*idx < cb->args[0]) 2945 goto skip; 2946 2947 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 2948 portid, seq, 2949 RTM_NEWNEIGH, NTF_SELF, 2950 NLM_F_MULTI, NUD_PERMANENT); 2951 if (err < 0) 2952 return err; 2953 skip: 2954 *idx += 1; 2955 } 2956 return 0; 2957 } 2958 2959 /** 2960 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2961 * @nlh: netlink message header 2962 * @dev: netdevice 2963 * 2964 * Default netdevice operation to dump the existing unicast address list. 2965 * Returns number of addresses from list put in skb. 2966 */ 2967 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2968 struct netlink_callback *cb, 2969 struct net_device *dev, 2970 struct net_device *filter_dev, 2971 int idx) 2972 { 2973 int err; 2974 2975 netif_addr_lock_bh(dev); 2976 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2977 if (err) 2978 goto out; 2979 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2980 out: 2981 netif_addr_unlock_bh(dev); 2982 return idx; 2983 } 2984 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2985 2986 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2987 { 2988 struct net_device *dev; 2989 struct nlattr *tb[IFLA_MAX+1]; 2990 struct net_device *br_dev = NULL; 2991 const struct net_device_ops *ops = NULL; 2992 const struct net_device_ops *cops = NULL; 2993 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2994 struct net *net = sock_net(skb->sk); 2995 int brport_idx = 0; 2996 int br_idx = 0; 2997 int idx = 0; 2998 2999 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 3000 ifla_policy) == 0) { 3001 if (tb[IFLA_MASTER]) 3002 br_idx = nla_get_u32(tb[IFLA_MASTER]); 3003 } 3004 3005 brport_idx = ifm->ifi_index; 3006 3007 if (br_idx) { 3008 br_dev = __dev_get_by_index(net, br_idx); 3009 if (!br_dev) 3010 return -ENODEV; 3011 3012 ops = br_dev->netdev_ops; 3013 } 3014 3015 for_each_netdev(net, dev) { 3016 if (brport_idx && (dev->ifindex != brport_idx)) 3017 continue; 3018 3019 if (!br_idx) { /* user did not specify a specific bridge */ 3020 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3021 br_dev = netdev_master_upper_dev_get(dev); 3022 cops = br_dev->netdev_ops; 3023 } 3024 3025 } else { 3026 if (dev != br_dev && 3027 !(dev->priv_flags & IFF_BRIDGE_PORT)) 3028 continue; 3029 3030 if (br_dev != netdev_master_upper_dev_get(dev) && 3031 !(dev->priv_flags & IFF_EBRIDGE)) 3032 continue; 3033 3034 cops = ops; 3035 } 3036 3037 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3038 if (cops && cops->ndo_fdb_dump) 3039 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 3040 idx); 3041 } 3042 3043 if (dev->netdev_ops->ndo_fdb_dump) 3044 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL, 3045 idx); 3046 else 3047 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 3048 3049 cops = NULL; 3050 } 3051 3052 cb->args[0] = idx; 3053 return skb->len; 3054 } 3055 3056 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 3057 unsigned int attrnum, unsigned int flag) 3058 { 3059 if (mask & flag) 3060 return nla_put_u8(skb, attrnum, !!(flags & flag)); 3061 return 0; 3062 } 3063 3064 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 3065 struct net_device *dev, u16 mode, 3066 u32 flags, u32 mask, int nlflags, 3067 u32 filter_mask, 3068 int (*vlan_fill)(struct sk_buff *skb, 3069 struct net_device *dev, 3070 u32 filter_mask)) 3071 { 3072 struct nlmsghdr *nlh; 3073 struct ifinfomsg *ifm; 3074 struct nlattr *br_afspec; 3075 struct nlattr *protinfo; 3076 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 3077 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3078 int err = 0; 3079 3080 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 3081 if (nlh == NULL) 3082 return -EMSGSIZE; 3083 3084 ifm = nlmsg_data(nlh); 3085 ifm->ifi_family = AF_BRIDGE; 3086 ifm->__ifi_pad = 0; 3087 ifm->ifi_type = dev->type; 3088 ifm->ifi_index = dev->ifindex; 3089 ifm->ifi_flags = dev_get_flags(dev); 3090 ifm->ifi_change = 0; 3091 3092 3093 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 3094 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 3095 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 3096 (br_dev && 3097 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 3098 (dev->addr_len && 3099 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 3100 (dev->ifindex != dev_get_iflink(dev) && 3101 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 3102 goto nla_put_failure; 3103 3104 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 3105 if (!br_afspec) 3106 goto nla_put_failure; 3107 3108 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 3109 nla_nest_cancel(skb, br_afspec); 3110 goto nla_put_failure; 3111 } 3112 3113 if (mode != BRIDGE_MODE_UNDEF) { 3114 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 3115 nla_nest_cancel(skb, br_afspec); 3116 goto nla_put_failure; 3117 } 3118 } 3119 if (vlan_fill) { 3120 err = vlan_fill(skb, dev, filter_mask); 3121 if (err) { 3122 nla_nest_cancel(skb, br_afspec); 3123 goto nla_put_failure; 3124 } 3125 } 3126 nla_nest_end(skb, br_afspec); 3127 3128 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 3129 if (!protinfo) 3130 goto nla_put_failure; 3131 3132 if (brport_nla_put_flag(skb, flags, mask, 3133 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 3134 brport_nla_put_flag(skb, flags, mask, 3135 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 3136 brport_nla_put_flag(skb, flags, mask, 3137 IFLA_BRPORT_FAST_LEAVE, 3138 BR_MULTICAST_FAST_LEAVE) || 3139 brport_nla_put_flag(skb, flags, mask, 3140 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 3141 brport_nla_put_flag(skb, flags, mask, 3142 IFLA_BRPORT_LEARNING, BR_LEARNING) || 3143 brport_nla_put_flag(skb, flags, mask, 3144 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 3145 brport_nla_put_flag(skb, flags, mask, 3146 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3147 brport_nla_put_flag(skb, flags, mask, 3148 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3149 nla_nest_cancel(skb, protinfo); 3150 goto nla_put_failure; 3151 } 3152 3153 nla_nest_end(skb, protinfo); 3154 3155 nlmsg_end(skb, nlh); 3156 return 0; 3157 nla_put_failure: 3158 nlmsg_cancel(skb, nlh); 3159 return err ? err : -EMSGSIZE; 3160 } 3161 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3162 3163 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3164 { 3165 struct net *net = sock_net(skb->sk); 3166 struct net_device *dev; 3167 int idx = 0; 3168 u32 portid = NETLINK_CB(cb->skb).portid; 3169 u32 seq = cb->nlh->nlmsg_seq; 3170 u32 filter_mask = 0; 3171 int err; 3172 3173 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3174 struct nlattr *extfilt; 3175 3176 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3177 IFLA_EXT_MASK); 3178 if (extfilt) { 3179 if (nla_len(extfilt) < sizeof(filter_mask)) 3180 return -EINVAL; 3181 3182 filter_mask = nla_get_u32(extfilt); 3183 } 3184 } 3185 3186 rcu_read_lock(); 3187 for_each_netdev_rcu(net, dev) { 3188 const struct net_device_ops *ops = dev->netdev_ops; 3189 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3190 3191 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3192 if (idx >= cb->args[0]) { 3193 err = br_dev->netdev_ops->ndo_bridge_getlink( 3194 skb, portid, seq, dev, 3195 filter_mask, NLM_F_MULTI); 3196 if (err < 0 && err != -EOPNOTSUPP) 3197 break; 3198 } 3199 idx++; 3200 } 3201 3202 if (ops->ndo_bridge_getlink) { 3203 if (idx >= cb->args[0]) { 3204 err = ops->ndo_bridge_getlink(skb, portid, 3205 seq, dev, 3206 filter_mask, 3207 NLM_F_MULTI); 3208 if (err < 0 && err != -EOPNOTSUPP) 3209 break; 3210 } 3211 idx++; 3212 } 3213 } 3214 rcu_read_unlock(); 3215 cb->args[0] = idx; 3216 3217 return skb->len; 3218 } 3219 3220 static inline size_t bridge_nlmsg_size(void) 3221 { 3222 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3223 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3224 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3225 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3226 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3227 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3228 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3229 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3230 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3231 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3232 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3233 } 3234 3235 static int rtnl_bridge_notify(struct net_device *dev) 3236 { 3237 struct net *net = dev_net(dev); 3238 struct sk_buff *skb; 3239 int err = -EOPNOTSUPP; 3240 3241 if (!dev->netdev_ops->ndo_bridge_getlink) 3242 return 0; 3243 3244 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3245 if (!skb) { 3246 err = -ENOMEM; 3247 goto errout; 3248 } 3249 3250 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3251 if (err < 0) 3252 goto errout; 3253 3254 if (!skb->len) 3255 goto errout; 3256 3257 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3258 return 0; 3259 errout: 3260 WARN_ON(err == -EMSGSIZE); 3261 kfree_skb(skb); 3262 if (err) 3263 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3264 return err; 3265 } 3266 3267 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3268 { 3269 struct net *net = sock_net(skb->sk); 3270 struct ifinfomsg *ifm; 3271 struct net_device *dev; 3272 struct nlattr *br_spec, *attr = NULL; 3273 int rem, err = -EOPNOTSUPP; 3274 u16 flags = 0; 3275 bool have_flags = false; 3276 3277 if (nlmsg_len(nlh) < sizeof(*ifm)) 3278 return -EINVAL; 3279 3280 ifm = nlmsg_data(nlh); 3281 if (ifm->ifi_family != AF_BRIDGE) 3282 return -EPFNOSUPPORT; 3283 3284 dev = __dev_get_by_index(net, ifm->ifi_index); 3285 if (!dev) { 3286 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3287 return -ENODEV; 3288 } 3289 3290 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3291 if (br_spec) { 3292 nla_for_each_nested(attr, br_spec, rem) { 3293 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3294 if (nla_len(attr) < sizeof(flags)) 3295 return -EINVAL; 3296 3297 have_flags = true; 3298 flags = nla_get_u16(attr); 3299 break; 3300 } 3301 } 3302 } 3303 3304 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3305 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3306 3307 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3308 err = -EOPNOTSUPP; 3309 goto out; 3310 } 3311 3312 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3313 if (err) 3314 goto out; 3315 3316 flags &= ~BRIDGE_FLAGS_MASTER; 3317 } 3318 3319 if ((flags & BRIDGE_FLAGS_SELF)) { 3320 if (!dev->netdev_ops->ndo_bridge_setlink) 3321 err = -EOPNOTSUPP; 3322 else 3323 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3324 flags); 3325 if (!err) { 3326 flags &= ~BRIDGE_FLAGS_SELF; 3327 3328 /* Generate event to notify upper layer of bridge 3329 * change 3330 */ 3331 err = rtnl_bridge_notify(dev); 3332 } 3333 } 3334 3335 if (have_flags) 3336 memcpy(nla_data(attr), &flags, sizeof(flags)); 3337 out: 3338 return err; 3339 } 3340 3341 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3342 { 3343 struct net *net = sock_net(skb->sk); 3344 struct ifinfomsg *ifm; 3345 struct net_device *dev; 3346 struct nlattr *br_spec, *attr = NULL; 3347 int rem, err = -EOPNOTSUPP; 3348 u16 flags = 0; 3349 bool have_flags = false; 3350 3351 if (nlmsg_len(nlh) < sizeof(*ifm)) 3352 return -EINVAL; 3353 3354 ifm = nlmsg_data(nlh); 3355 if (ifm->ifi_family != AF_BRIDGE) 3356 return -EPFNOSUPPORT; 3357 3358 dev = __dev_get_by_index(net, ifm->ifi_index); 3359 if (!dev) { 3360 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3361 return -ENODEV; 3362 } 3363 3364 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3365 if (br_spec) { 3366 nla_for_each_nested(attr, br_spec, rem) { 3367 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3368 if (nla_len(attr) < sizeof(flags)) 3369 return -EINVAL; 3370 3371 have_flags = true; 3372 flags = nla_get_u16(attr); 3373 break; 3374 } 3375 } 3376 } 3377 3378 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3379 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3380 3381 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3382 err = -EOPNOTSUPP; 3383 goto out; 3384 } 3385 3386 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3387 if (err) 3388 goto out; 3389 3390 flags &= ~BRIDGE_FLAGS_MASTER; 3391 } 3392 3393 if ((flags & BRIDGE_FLAGS_SELF)) { 3394 if (!dev->netdev_ops->ndo_bridge_dellink) 3395 err = -EOPNOTSUPP; 3396 else 3397 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3398 flags); 3399 3400 if (!err) { 3401 flags &= ~BRIDGE_FLAGS_SELF; 3402 3403 /* Generate event to notify upper layer of bridge 3404 * change 3405 */ 3406 err = rtnl_bridge_notify(dev); 3407 } 3408 } 3409 3410 if (have_flags) 3411 memcpy(nla_data(attr), &flags, sizeof(flags)); 3412 out: 3413 return err; 3414 } 3415 3416 /* Process one rtnetlink message. */ 3417 3418 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3419 { 3420 struct net *net = sock_net(skb->sk); 3421 rtnl_doit_func doit; 3422 int kind; 3423 int family; 3424 int type; 3425 int err; 3426 3427 type = nlh->nlmsg_type; 3428 if (type > RTM_MAX) 3429 return -EOPNOTSUPP; 3430 3431 type -= RTM_BASE; 3432 3433 /* All the messages must have at least 1 byte length */ 3434 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3435 return 0; 3436 3437 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3438 kind = type&3; 3439 3440 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3441 return -EPERM; 3442 3443 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 3444 struct sock *rtnl; 3445 rtnl_dumpit_func dumpit; 3446 rtnl_calcit_func calcit; 3447 u16 min_dump_alloc = 0; 3448 3449 dumpit = rtnl_get_dumpit(family, type); 3450 if (dumpit == NULL) 3451 return -EOPNOTSUPP; 3452 calcit = rtnl_get_calcit(family, type); 3453 if (calcit) 3454 min_dump_alloc = calcit(skb, nlh); 3455 3456 __rtnl_unlock(); 3457 rtnl = net->rtnl; 3458 { 3459 struct netlink_dump_control c = { 3460 .dump = dumpit, 3461 .min_dump_alloc = min_dump_alloc, 3462 }; 3463 err = netlink_dump_start(rtnl, skb, nlh, &c); 3464 } 3465 rtnl_lock(); 3466 return err; 3467 } 3468 3469 doit = rtnl_get_doit(family, type); 3470 if (doit == NULL) 3471 return -EOPNOTSUPP; 3472 3473 return doit(skb, nlh); 3474 } 3475 3476 static void rtnetlink_rcv(struct sk_buff *skb) 3477 { 3478 rtnl_lock(); 3479 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 3480 rtnl_unlock(); 3481 } 3482 3483 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 3484 { 3485 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3486 3487 switch (event) { 3488 case NETDEV_UP: 3489 case NETDEV_DOWN: 3490 case NETDEV_PRE_UP: 3491 case NETDEV_POST_INIT: 3492 case NETDEV_REGISTER: 3493 case NETDEV_CHANGE: 3494 case NETDEV_PRE_TYPE_CHANGE: 3495 case NETDEV_GOING_DOWN: 3496 case NETDEV_UNREGISTER: 3497 case NETDEV_UNREGISTER_FINAL: 3498 case NETDEV_RELEASE: 3499 case NETDEV_JOIN: 3500 case NETDEV_BONDING_INFO: 3501 break; 3502 default: 3503 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3504 break; 3505 } 3506 return NOTIFY_DONE; 3507 } 3508 3509 static struct notifier_block rtnetlink_dev_notifier = { 3510 .notifier_call = rtnetlink_event, 3511 }; 3512 3513 3514 static int __net_init rtnetlink_net_init(struct net *net) 3515 { 3516 struct sock *sk; 3517 struct netlink_kernel_cfg cfg = { 3518 .groups = RTNLGRP_MAX, 3519 .input = rtnetlink_rcv, 3520 .cb_mutex = &rtnl_mutex, 3521 .flags = NL_CFG_F_NONROOT_RECV, 3522 }; 3523 3524 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3525 if (!sk) 3526 return -ENOMEM; 3527 net->rtnl = sk; 3528 return 0; 3529 } 3530 3531 static void __net_exit rtnetlink_net_exit(struct net *net) 3532 { 3533 netlink_kernel_release(net->rtnl); 3534 net->rtnl = NULL; 3535 } 3536 3537 static struct pernet_operations rtnetlink_net_ops = { 3538 .init = rtnetlink_net_init, 3539 .exit = rtnetlink_net_exit, 3540 }; 3541 3542 void __init rtnetlink_init(void) 3543 { 3544 if (register_pernet_subsys(&rtnetlink_net_ops)) 3545 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3546 3547 register_netdevice_notifier(&rtnetlink_dev_notifier); 3548 3549 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3550 rtnl_dump_ifinfo, rtnl_calcit); 3551 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3552 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3553 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3554 3555 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3556 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3557 3558 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3559 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3560 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3561 3562 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3563 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3564 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3565 } 3566