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(4) /* IFLA_MAX_GSO_SEGS */ 899 + nla_total_size(4) /* IFLA_MAX_GSO_SIZE */ 900 + nla_total_size(1) /* IFLA_OPERSTATE */ 901 + nla_total_size(1) /* IFLA_LINKMODE */ 902 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 903 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 904 + nla_total_size(ext_filter_mask 905 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 906 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 907 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 908 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 909 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 910 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 911 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 912 + nla_total_size(1); /* IFLA_PROTO_DOWN */ 913 914 } 915 916 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 917 { 918 struct nlattr *vf_ports; 919 struct nlattr *vf_port; 920 int vf; 921 int err; 922 923 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 924 if (!vf_ports) 925 return -EMSGSIZE; 926 927 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 928 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 929 if (!vf_port) 930 goto nla_put_failure; 931 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 932 goto nla_put_failure; 933 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 934 if (err == -EMSGSIZE) 935 goto nla_put_failure; 936 if (err) { 937 nla_nest_cancel(skb, vf_port); 938 continue; 939 } 940 nla_nest_end(skb, vf_port); 941 } 942 943 nla_nest_end(skb, vf_ports); 944 945 return 0; 946 947 nla_put_failure: 948 nla_nest_cancel(skb, vf_ports); 949 return -EMSGSIZE; 950 } 951 952 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 953 { 954 struct nlattr *port_self; 955 int err; 956 957 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 958 if (!port_self) 959 return -EMSGSIZE; 960 961 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 962 if (err) { 963 nla_nest_cancel(skb, port_self); 964 return (err == -EMSGSIZE) ? err : 0; 965 } 966 967 nla_nest_end(skb, port_self); 968 969 return 0; 970 } 971 972 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 973 u32 ext_filter_mask) 974 { 975 int err; 976 977 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 978 !(ext_filter_mask & RTEXT_FILTER_VF)) 979 return 0; 980 981 err = rtnl_port_self_fill(skb, dev); 982 if (err) 983 return err; 984 985 if (dev_num_vf(dev->dev.parent)) { 986 err = rtnl_vf_ports_fill(skb, dev); 987 if (err) 988 return err; 989 } 990 991 return 0; 992 } 993 994 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 995 { 996 int err; 997 struct netdev_phys_item_id ppid; 998 999 err = dev_get_phys_port_id(dev, &ppid); 1000 if (err) { 1001 if (err == -EOPNOTSUPP) 1002 return 0; 1003 return err; 1004 } 1005 1006 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1007 return -EMSGSIZE; 1008 1009 return 0; 1010 } 1011 1012 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1013 { 1014 char name[IFNAMSIZ]; 1015 int err; 1016 1017 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1018 if (err) { 1019 if (err == -EOPNOTSUPP) 1020 return 0; 1021 return err; 1022 } 1023 1024 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 1025 return -EMSGSIZE; 1026 1027 return 0; 1028 } 1029 1030 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1031 { 1032 int err; 1033 struct switchdev_attr attr = { 1034 .orig_dev = dev, 1035 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 1036 .flags = SWITCHDEV_F_NO_RECURSE, 1037 }; 1038 1039 err = switchdev_port_attr_get(dev, &attr); 1040 if (err) { 1041 if (err == -EOPNOTSUPP) 1042 return 0; 1043 return err; 1044 } 1045 1046 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1047 attr.u.ppid.id)) 1048 return -EMSGSIZE; 1049 1050 return 0; 1051 } 1052 1053 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1054 struct net_device *dev) 1055 { 1056 const struct rtnl_link_stats64 *stats; 1057 struct rtnl_link_stats64 temp; 1058 struct nlattr *attr; 1059 1060 stats = dev_get_stats(dev, &temp); 1061 1062 attr = nla_reserve(skb, IFLA_STATS, 1063 sizeof(struct rtnl_link_stats)); 1064 if (!attr) 1065 return -EMSGSIZE; 1066 1067 copy_rtnl_link_stats(nla_data(attr), stats); 1068 1069 attr = nla_reserve(skb, IFLA_STATS64, 1070 sizeof(struct rtnl_link_stats64)); 1071 if (!attr) 1072 return -EMSGSIZE; 1073 1074 copy_rtnl_link_stats64(nla_data(attr), stats); 1075 1076 return 0; 1077 } 1078 1079 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1080 struct net_device *dev, 1081 int vfs_num, 1082 struct nlattr *vfinfo) 1083 { 1084 struct ifla_vf_rss_query_en vf_rss_query_en; 1085 struct ifla_vf_link_state vf_linkstate; 1086 struct ifla_vf_spoofchk vf_spoofchk; 1087 struct ifla_vf_tx_rate vf_tx_rate; 1088 struct ifla_vf_stats vf_stats; 1089 struct ifla_vf_trust vf_trust; 1090 struct ifla_vf_vlan vf_vlan; 1091 struct ifla_vf_rate vf_rate; 1092 struct nlattr *vf, *vfstats; 1093 struct ifla_vf_mac vf_mac; 1094 struct ifla_vf_info ivi; 1095 1096 /* Not all SR-IOV capable drivers support the 1097 * spoofcheck and "RSS query enable" query. Preset to 1098 * -1 so the user space tool can detect that the driver 1099 * didn't report anything. 1100 */ 1101 ivi.spoofchk = -1; 1102 ivi.rss_query_en = -1; 1103 ivi.trusted = -1; 1104 memset(ivi.mac, 0, sizeof(ivi.mac)); 1105 /* The default value for VF link state is "auto" 1106 * IFLA_VF_LINK_STATE_AUTO which equals zero 1107 */ 1108 ivi.linkstate = 0; 1109 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1110 return 0; 1111 1112 vf_mac.vf = 1113 vf_vlan.vf = 1114 vf_rate.vf = 1115 vf_tx_rate.vf = 1116 vf_spoofchk.vf = 1117 vf_linkstate.vf = 1118 vf_rss_query_en.vf = 1119 vf_trust.vf = ivi.vf; 1120 1121 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1122 vf_vlan.vlan = ivi.vlan; 1123 vf_vlan.qos = ivi.qos; 1124 vf_tx_rate.rate = ivi.max_tx_rate; 1125 vf_rate.min_tx_rate = ivi.min_tx_rate; 1126 vf_rate.max_tx_rate = ivi.max_tx_rate; 1127 vf_spoofchk.setting = ivi.spoofchk; 1128 vf_linkstate.link_state = ivi.linkstate; 1129 vf_rss_query_en.setting = ivi.rss_query_en; 1130 vf_trust.setting = ivi.trusted; 1131 vf = nla_nest_start(skb, IFLA_VF_INFO); 1132 if (!vf) { 1133 nla_nest_cancel(skb, vfinfo); 1134 return -EMSGSIZE; 1135 } 1136 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1137 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1138 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1139 &vf_rate) || 1140 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1141 &vf_tx_rate) || 1142 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1143 &vf_spoofchk) || 1144 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1145 &vf_linkstate) || 1146 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1147 sizeof(vf_rss_query_en), 1148 &vf_rss_query_en) || 1149 nla_put(skb, IFLA_VF_TRUST, 1150 sizeof(vf_trust), &vf_trust)) 1151 return -EMSGSIZE; 1152 memset(&vf_stats, 0, sizeof(vf_stats)); 1153 if (dev->netdev_ops->ndo_get_vf_stats) 1154 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1155 &vf_stats); 1156 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1157 if (!vfstats) { 1158 nla_nest_cancel(skb, vf); 1159 nla_nest_cancel(skb, vfinfo); 1160 return -EMSGSIZE; 1161 } 1162 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS, 1163 vf_stats.rx_packets) || 1164 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS, 1165 vf_stats.tx_packets) || 1166 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES, 1167 vf_stats.rx_bytes) || 1168 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES, 1169 vf_stats.tx_bytes) || 1170 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST, 1171 vf_stats.broadcast) || 1172 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST, 1173 vf_stats.multicast)) 1174 return -EMSGSIZE; 1175 nla_nest_end(skb, vfstats); 1176 nla_nest_end(skb, vf); 1177 return 0; 1178 } 1179 1180 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1181 { 1182 struct rtnl_link_ifmap map = { 1183 .mem_start = dev->mem_start, 1184 .mem_end = dev->mem_end, 1185 .base_addr = dev->base_addr, 1186 .irq = dev->irq, 1187 .dma = dev->dma, 1188 .port = dev->if_port, 1189 }; 1190 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1191 return -EMSGSIZE; 1192 1193 return 0; 1194 } 1195 1196 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1197 int type, u32 pid, u32 seq, u32 change, 1198 unsigned int flags, u32 ext_filter_mask) 1199 { 1200 struct ifinfomsg *ifm; 1201 struct nlmsghdr *nlh; 1202 struct nlattr *af_spec; 1203 struct rtnl_af_ops *af_ops; 1204 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1205 1206 ASSERT_RTNL(); 1207 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1208 if (nlh == NULL) 1209 return -EMSGSIZE; 1210 1211 ifm = nlmsg_data(nlh); 1212 ifm->ifi_family = AF_UNSPEC; 1213 ifm->__ifi_pad = 0; 1214 ifm->ifi_type = dev->type; 1215 ifm->ifi_index = dev->ifindex; 1216 ifm->ifi_flags = dev_get_flags(dev); 1217 ifm->ifi_change = change; 1218 1219 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1220 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1221 nla_put_u8(skb, IFLA_OPERSTATE, 1222 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1223 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1224 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1225 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1226 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1227 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1228 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) || 1229 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) || 1230 #ifdef CONFIG_RPS 1231 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1232 #endif 1233 (dev->ifindex != dev_get_iflink(dev) && 1234 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1235 (upper_dev && 1236 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1237 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1238 (dev->qdisc && 1239 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1240 (dev->ifalias && 1241 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1242 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1243 atomic_read(&dev->carrier_changes)) || 1244 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1245 goto nla_put_failure; 1246 1247 if (rtnl_fill_link_ifmap(skb, dev)) 1248 goto nla_put_failure; 1249 1250 if (dev->addr_len) { 1251 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1252 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1253 goto nla_put_failure; 1254 } 1255 1256 if (rtnl_phys_port_id_fill(skb, dev)) 1257 goto nla_put_failure; 1258 1259 if (rtnl_phys_port_name_fill(skb, dev)) 1260 goto nla_put_failure; 1261 1262 if (rtnl_phys_switch_id_fill(skb, dev)) 1263 goto nla_put_failure; 1264 1265 if (rtnl_fill_stats(skb, dev)) 1266 goto nla_put_failure; 1267 1268 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1269 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1270 goto nla_put_failure; 1271 1272 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent && 1273 ext_filter_mask & RTEXT_FILTER_VF) { 1274 int i; 1275 struct nlattr *vfinfo; 1276 int num_vfs = dev_num_vf(dev->dev.parent); 1277 1278 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1279 if (!vfinfo) 1280 goto nla_put_failure; 1281 for (i = 0; i < num_vfs; i++) { 1282 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1283 goto nla_put_failure; 1284 } 1285 1286 nla_nest_end(skb, vfinfo); 1287 } 1288 1289 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1290 goto nla_put_failure; 1291 1292 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1293 if (rtnl_link_fill(skb, dev) < 0) 1294 goto nla_put_failure; 1295 } 1296 1297 if (dev->rtnl_link_ops && 1298 dev->rtnl_link_ops->get_link_net) { 1299 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1300 1301 if (!net_eq(dev_net(dev), link_net)) { 1302 int id = peernet2id_alloc(dev_net(dev), link_net); 1303 1304 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1305 goto nla_put_failure; 1306 } 1307 } 1308 1309 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1310 goto nla_put_failure; 1311 1312 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1313 if (af_ops->fill_link_af) { 1314 struct nlattr *af; 1315 int err; 1316 1317 if (!(af = nla_nest_start(skb, af_ops->family))) 1318 goto nla_put_failure; 1319 1320 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1321 1322 /* 1323 * Caller may return ENODATA to indicate that there 1324 * was no data to be dumped. This is not an error, it 1325 * means we should trim the attribute header and 1326 * continue. 1327 */ 1328 if (err == -ENODATA) 1329 nla_nest_cancel(skb, af); 1330 else if (err < 0) 1331 goto nla_put_failure; 1332 1333 nla_nest_end(skb, af); 1334 } 1335 } 1336 1337 nla_nest_end(skb, af_spec); 1338 1339 nlmsg_end(skb, nlh); 1340 return 0; 1341 1342 nla_put_failure: 1343 nlmsg_cancel(skb, nlh); 1344 return -EMSGSIZE; 1345 } 1346 1347 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1348 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1349 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1350 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1351 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1352 [IFLA_MTU] = { .type = NLA_U32 }, 1353 [IFLA_LINK] = { .type = NLA_U32 }, 1354 [IFLA_MASTER] = { .type = NLA_U32 }, 1355 [IFLA_CARRIER] = { .type = NLA_U8 }, 1356 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1357 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1358 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1359 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1360 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1361 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1362 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1363 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1364 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1365 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1366 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1367 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1368 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1369 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1370 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1371 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1372 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1373 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1374 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1375 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1376 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1377 }; 1378 1379 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1380 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1381 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1382 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1383 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1384 }; 1385 1386 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1387 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1388 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1389 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1390 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1391 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1392 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1393 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1394 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1395 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1396 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1397 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) }, 1398 }; 1399 1400 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1401 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1402 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1403 .len = PORT_PROFILE_MAX }, 1404 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1405 .len = sizeof(struct ifla_port_vsi)}, 1406 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1407 .len = PORT_UUID_MAX }, 1408 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1409 .len = PORT_UUID_MAX }, 1410 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1411 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1412 }; 1413 1414 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 1415 { 1416 const struct rtnl_link_ops *ops = NULL; 1417 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 1418 1419 if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0) 1420 return NULL; 1421 1422 if (linfo[IFLA_INFO_KIND]) { 1423 char kind[MODULE_NAME_LEN]; 1424 1425 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 1426 ops = rtnl_link_ops_get(kind); 1427 } 1428 1429 return ops; 1430 } 1431 1432 static bool link_master_filtered(struct net_device *dev, int master_idx) 1433 { 1434 struct net_device *master; 1435 1436 if (!master_idx) 1437 return false; 1438 1439 master = netdev_master_upper_dev_get(dev); 1440 if (!master || master->ifindex != master_idx) 1441 return true; 1442 1443 return false; 1444 } 1445 1446 static bool link_kind_filtered(const struct net_device *dev, 1447 const struct rtnl_link_ops *kind_ops) 1448 { 1449 if (kind_ops && dev->rtnl_link_ops != kind_ops) 1450 return true; 1451 1452 return false; 1453 } 1454 1455 static bool link_dump_filtered(struct net_device *dev, 1456 int master_idx, 1457 const struct rtnl_link_ops *kind_ops) 1458 { 1459 if (link_master_filtered(dev, master_idx) || 1460 link_kind_filtered(dev, kind_ops)) 1461 return true; 1462 1463 return false; 1464 } 1465 1466 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1467 { 1468 struct net *net = sock_net(skb->sk); 1469 int h, s_h; 1470 int idx = 0, s_idx; 1471 struct net_device *dev; 1472 struct hlist_head *head; 1473 struct nlattr *tb[IFLA_MAX+1]; 1474 u32 ext_filter_mask = 0; 1475 const struct rtnl_link_ops *kind_ops = NULL; 1476 unsigned int flags = NLM_F_MULTI; 1477 int master_idx = 0; 1478 int err; 1479 int hdrlen; 1480 1481 s_h = cb->args[0]; 1482 s_idx = cb->args[1]; 1483 1484 cb->seq = net->dev_base_seq; 1485 1486 /* A hack to preserve kernel<->userspace interface. 1487 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1488 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1489 * what iproute2 < v3.9.0 used. 1490 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1491 * attribute, its netlink message is shorter than struct ifinfomsg. 1492 */ 1493 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1494 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1495 1496 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1497 1498 if (tb[IFLA_EXT_MASK]) 1499 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1500 1501 if (tb[IFLA_MASTER]) 1502 master_idx = nla_get_u32(tb[IFLA_MASTER]); 1503 1504 if (tb[IFLA_LINKINFO]) 1505 kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]); 1506 1507 if (master_idx || kind_ops) 1508 flags |= NLM_F_DUMP_FILTERED; 1509 } 1510 1511 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1512 idx = 0; 1513 head = &net->dev_index_head[h]; 1514 hlist_for_each_entry(dev, head, index_hlist) { 1515 if (link_dump_filtered(dev, master_idx, kind_ops)) 1516 continue; 1517 if (idx < s_idx) 1518 goto cont; 1519 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1520 NETLINK_CB(cb->skb).portid, 1521 cb->nlh->nlmsg_seq, 0, 1522 flags, 1523 ext_filter_mask); 1524 /* If we ran out of room on the first message, 1525 * we're in trouble 1526 */ 1527 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1528 1529 if (err < 0) 1530 goto out; 1531 1532 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1533 cont: 1534 idx++; 1535 } 1536 } 1537 out: 1538 cb->args[1] = idx; 1539 cb->args[0] = h; 1540 1541 return skb->len; 1542 } 1543 1544 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1545 { 1546 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1547 } 1548 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1549 1550 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1551 { 1552 struct net *net; 1553 /* Examine the link attributes and figure out which 1554 * network namespace we are talking about. 1555 */ 1556 if (tb[IFLA_NET_NS_PID]) 1557 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1558 else if (tb[IFLA_NET_NS_FD]) 1559 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1560 else 1561 net = get_net(src_net); 1562 return net; 1563 } 1564 EXPORT_SYMBOL(rtnl_link_get_net); 1565 1566 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1567 { 1568 if (dev) { 1569 if (tb[IFLA_ADDRESS] && 1570 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1571 return -EINVAL; 1572 1573 if (tb[IFLA_BROADCAST] && 1574 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1575 return -EINVAL; 1576 } 1577 1578 if (tb[IFLA_AF_SPEC]) { 1579 struct nlattr *af; 1580 int rem, err; 1581 1582 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1583 const struct rtnl_af_ops *af_ops; 1584 1585 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1586 return -EAFNOSUPPORT; 1587 1588 if (!af_ops->set_link_af) 1589 return -EOPNOTSUPP; 1590 1591 if (af_ops->validate_link_af) { 1592 err = af_ops->validate_link_af(dev, af); 1593 if (err < 0) 1594 return err; 1595 } 1596 } 1597 } 1598 1599 return 0; 1600 } 1601 1602 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt, 1603 int guid_type) 1604 { 1605 const struct net_device_ops *ops = dev->netdev_ops; 1606 1607 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type); 1608 } 1609 1610 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type) 1611 { 1612 if (dev->type != ARPHRD_INFINIBAND) 1613 return -EOPNOTSUPP; 1614 1615 return handle_infiniband_guid(dev, ivt, guid_type); 1616 } 1617 1618 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 1619 { 1620 const struct net_device_ops *ops = dev->netdev_ops; 1621 int err = -EINVAL; 1622 1623 if (tb[IFLA_VF_MAC]) { 1624 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 1625 1626 err = -EOPNOTSUPP; 1627 if (ops->ndo_set_vf_mac) 1628 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1629 ivm->mac); 1630 if (err < 0) 1631 return err; 1632 } 1633 1634 if (tb[IFLA_VF_VLAN]) { 1635 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 1636 1637 err = -EOPNOTSUPP; 1638 if (ops->ndo_set_vf_vlan) 1639 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 1640 ivv->qos); 1641 if (err < 0) 1642 return err; 1643 } 1644 1645 if (tb[IFLA_VF_TX_RATE]) { 1646 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1647 struct ifla_vf_info ivf; 1648 1649 err = -EOPNOTSUPP; 1650 if (ops->ndo_get_vf_config) 1651 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 1652 if (err < 0) 1653 return err; 1654 1655 err = -EOPNOTSUPP; 1656 if (ops->ndo_set_vf_rate) 1657 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1658 ivf.min_tx_rate, 1659 ivt->rate); 1660 if (err < 0) 1661 return err; 1662 } 1663 1664 if (tb[IFLA_VF_RATE]) { 1665 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 1666 1667 err = -EOPNOTSUPP; 1668 if (ops->ndo_set_vf_rate) 1669 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1670 ivt->min_tx_rate, 1671 ivt->max_tx_rate); 1672 if (err < 0) 1673 return err; 1674 } 1675 1676 if (tb[IFLA_VF_SPOOFCHK]) { 1677 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 1678 1679 err = -EOPNOTSUPP; 1680 if (ops->ndo_set_vf_spoofchk) 1681 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1682 ivs->setting); 1683 if (err < 0) 1684 return err; 1685 } 1686 1687 if (tb[IFLA_VF_LINK_STATE]) { 1688 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 1689 1690 err = -EOPNOTSUPP; 1691 if (ops->ndo_set_vf_link_state) 1692 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1693 ivl->link_state); 1694 if (err < 0) 1695 return err; 1696 } 1697 1698 if (tb[IFLA_VF_RSS_QUERY_EN]) { 1699 struct ifla_vf_rss_query_en *ivrssq_en; 1700 1701 err = -EOPNOTSUPP; 1702 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 1703 if (ops->ndo_set_vf_rss_query_en) 1704 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 1705 ivrssq_en->setting); 1706 if (err < 0) 1707 return err; 1708 } 1709 1710 if (tb[IFLA_VF_TRUST]) { 1711 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 1712 1713 err = -EOPNOTSUPP; 1714 if (ops->ndo_set_vf_trust) 1715 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 1716 if (err < 0) 1717 return err; 1718 } 1719 1720 if (tb[IFLA_VF_IB_NODE_GUID]) { 1721 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]); 1722 1723 if (!ops->ndo_set_vf_guid) 1724 return -EOPNOTSUPP; 1725 1726 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID); 1727 } 1728 1729 if (tb[IFLA_VF_IB_PORT_GUID]) { 1730 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]); 1731 1732 if (!ops->ndo_set_vf_guid) 1733 return -EOPNOTSUPP; 1734 1735 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID); 1736 } 1737 1738 return err; 1739 } 1740 1741 static int do_set_master(struct net_device *dev, int ifindex) 1742 { 1743 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1744 const struct net_device_ops *ops; 1745 int err; 1746 1747 if (upper_dev) { 1748 if (upper_dev->ifindex == ifindex) 1749 return 0; 1750 ops = upper_dev->netdev_ops; 1751 if (ops->ndo_del_slave) { 1752 err = ops->ndo_del_slave(upper_dev, dev); 1753 if (err) 1754 return err; 1755 } else { 1756 return -EOPNOTSUPP; 1757 } 1758 } 1759 1760 if (ifindex) { 1761 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1762 if (!upper_dev) 1763 return -EINVAL; 1764 ops = upper_dev->netdev_ops; 1765 if (ops->ndo_add_slave) { 1766 err = ops->ndo_add_slave(upper_dev, dev); 1767 if (err) 1768 return err; 1769 } else { 1770 return -EOPNOTSUPP; 1771 } 1772 } 1773 return 0; 1774 } 1775 1776 #define DO_SETLINK_MODIFIED 0x01 1777 /* notify flag means notify + modified. */ 1778 #define DO_SETLINK_NOTIFY 0x03 1779 static int do_setlink(const struct sk_buff *skb, 1780 struct net_device *dev, struct ifinfomsg *ifm, 1781 struct nlattr **tb, char *ifname, int status) 1782 { 1783 const struct net_device_ops *ops = dev->netdev_ops; 1784 int err; 1785 1786 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1787 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1788 if (IS_ERR(net)) { 1789 err = PTR_ERR(net); 1790 goto errout; 1791 } 1792 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1793 put_net(net); 1794 err = -EPERM; 1795 goto errout; 1796 } 1797 err = dev_change_net_namespace(dev, net, ifname); 1798 put_net(net); 1799 if (err) 1800 goto errout; 1801 status |= DO_SETLINK_MODIFIED; 1802 } 1803 1804 if (tb[IFLA_MAP]) { 1805 struct rtnl_link_ifmap *u_map; 1806 struct ifmap k_map; 1807 1808 if (!ops->ndo_set_config) { 1809 err = -EOPNOTSUPP; 1810 goto errout; 1811 } 1812 1813 if (!netif_device_present(dev)) { 1814 err = -ENODEV; 1815 goto errout; 1816 } 1817 1818 u_map = nla_data(tb[IFLA_MAP]); 1819 k_map.mem_start = (unsigned long) u_map->mem_start; 1820 k_map.mem_end = (unsigned long) u_map->mem_end; 1821 k_map.base_addr = (unsigned short) u_map->base_addr; 1822 k_map.irq = (unsigned char) u_map->irq; 1823 k_map.dma = (unsigned char) u_map->dma; 1824 k_map.port = (unsigned char) u_map->port; 1825 1826 err = ops->ndo_set_config(dev, &k_map); 1827 if (err < 0) 1828 goto errout; 1829 1830 status |= DO_SETLINK_NOTIFY; 1831 } 1832 1833 if (tb[IFLA_ADDRESS]) { 1834 struct sockaddr *sa; 1835 int len; 1836 1837 len = sizeof(sa_family_t) + dev->addr_len; 1838 sa = kmalloc(len, GFP_KERNEL); 1839 if (!sa) { 1840 err = -ENOMEM; 1841 goto errout; 1842 } 1843 sa->sa_family = dev->type; 1844 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1845 dev->addr_len); 1846 err = dev_set_mac_address(dev, sa); 1847 kfree(sa); 1848 if (err) 1849 goto errout; 1850 status |= DO_SETLINK_MODIFIED; 1851 } 1852 1853 if (tb[IFLA_MTU]) { 1854 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1855 if (err < 0) 1856 goto errout; 1857 status |= DO_SETLINK_MODIFIED; 1858 } 1859 1860 if (tb[IFLA_GROUP]) { 1861 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1862 status |= DO_SETLINK_NOTIFY; 1863 } 1864 1865 /* 1866 * Interface selected by interface index but interface 1867 * name provided implies that a name change has been 1868 * requested. 1869 */ 1870 if (ifm->ifi_index > 0 && ifname[0]) { 1871 err = dev_change_name(dev, ifname); 1872 if (err < 0) 1873 goto errout; 1874 status |= DO_SETLINK_MODIFIED; 1875 } 1876 1877 if (tb[IFLA_IFALIAS]) { 1878 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1879 nla_len(tb[IFLA_IFALIAS])); 1880 if (err < 0) 1881 goto errout; 1882 status |= DO_SETLINK_NOTIFY; 1883 } 1884 1885 if (tb[IFLA_BROADCAST]) { 1886 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1887 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1888 } 1889 1890 if (ifm->ifi_flags || ifm->ifi_change) { 1891 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1892 if (err < 0) 1893 goto errout; 1894 } 1895 1896 if (tb[IFLA_MASTER]) { 1897 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1898 if (err) 1899 goto errout; 1900 status |= DO_SETLINK_MODIFIED; 1901 } 1902 1903 if (tb[IFLA_CARRIER]) { 1904 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1905 if (err) 1906 goto errout; 1907 status |= DO_SETLINK_MODIFIED; 1908 } 1909 1910 if (tb[IFLA_TXQLEN]) { 1911 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1912 1913 if (dev->tx_queue_len ^ value) 1914 status |= DO_SETLINK_NOTIFY; 1915 1916 dev->tx_queue_len = value; 1917 } 1918 1919 if (tb[IFLA_OPERSTATE]) 1920 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1921 1922 if (tb[IFLA_LINKMODE]) { 1923 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1924 1925 write_lock_bh(&dev_base_lock); 1926 if (dev->link_mode ^ value) 1927 status |= DO_SETLINK_NOTIFY; 1928 dev->link_mode = value; 1929 write_unlock_bh(&dev_base_lock); 1930 } 1931 1932 if (tb[IFLA_VFINFO_LIST]) { 1933 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 1934 struct nlattr *attr; 1935 int rem; 1936 1937 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1938 if (nla_type(attr) != IFLA_VF_INFO || 1939 nla_len(attr) < NLA_HDRLEN) { 1940 err = -EINVAL; 1941 goto errout; 1942 } 1943 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 1944 ifla_vf_policy); 1945 if (err < 0) 1946 goto errout; 1947 err = do_setvfinfo(dev, vfinfo); 1948 if (err < 0) 1949 goto errout; 1950 status |= DO_SETLINK_NOTIFY; 1951 } 1952 } 1953 err = 0; 1954 1955 if (tb[IFLA_VF_PORTS]) { 1956 struct nlattr *port[IFLA_PORT_MAX+1]; 1957 struct nlattr *attr; 1958 int vf; 1959 int rem; 1960 1961 err = -EOPNOTSUPP; 1962 if (!ops->ndo_set_vf_port) 1963 goto errout; 1964 1965 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1966 if (nla_type(attr) != IFLA_VF_PORT || 1967 nla_len(attr) < NLA_HDRLEN) { 1968 err = -EINVAL; 1969 goto errout; 1970 } 1971 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 1972 ifla_port_policy); 1973 if (err < 0) 1974 goto errout; 1975 if (!port[IFLA_PORT_VF]) { 1976 err = -EOPNOTSUPP; 1977 goto errout; 1978 } 1979 vf = nla_get_u32(port[IFLA_PORT_VF]); 1980 err = ops->ndo_set_vf_port(dev, vf, port); 1981 if (err < 0) 1982 goto errout; 1983 status |= DO_SETLINK_NOTIFY; 1984 } 1985 } 1986 err = 0; 1987 1988 if (tb[IFLA_PORT_SELF]) { 1989 struct nlattr *port[IFLA_PORT_MAX+1]; 1990 1991 err = nla_parse_nested(port, IFLA_PORT_MAX, 1992 tb[IFLA_PORT_SELF], ifla_port_policy); 1993 if (err < 0) 1994 goto errout; 1995 1996 err = -EOPNOTSUPP; 1997 if (ops->ndo_set_vf_port) 1998 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1999 if (err < 0) 2000 goto errout; 2001 status |= DO_SETLINK_NOTIFY; 2002 } 2003 2004 if (tb[IFLA_AF_SPEC]) { 2005 struct nlattr *af; 2006 int rem; 2007 2008 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 2009 const struct rtnl_af_ops *af_ops; 2010 2011 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 2012 BUG(); 2013 2014 err = af_ops->set_link_af(dev, af); 2015 if (err < 0) 2016 goto errout; 2017 2018 status |= DO_SETLINK_NOTIFY; 2019 } 2020 } 2021 err = 0; 2022 2023 if (tb[IFLA_PROTO_DOWN]) { 2024 err = dev_change_proto_down(dev, 2025 nla_get_u8(tb[IFLA_PROTO_DOWN])); 2026 if (err) 2027 goto errout; 2028 status |= DO_SETLINK_NOTIFY; 2029 } 2030 2031 errout: 2032 if (status & DO_SETLINK_MODIFIED) { 2033 if (status & DO_SETLINK_NOTIFY) 2034 netdev_state_change(dev); 2035 2036 if (err < 0) 2037 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", 2038 dev->name); 2039 } 2040 2041 return err; 2042 } 2043 2044 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2045 { 2046 struct net *net = sock_net(skb->sk); 2047 struct ifinfomsg *ifm; 2048 struct net_device *dev; 2049 int err; 2050 struct nlattr *tb[IFLA_MAX+1]; 2051 char ifname[IFNAMSIZ]; 2052 2053 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2054 if (err < 0) 2055 goto errout; 2056 2057 if (tb[IFLA_IFNAME]) 2058 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2059 else 2060 ifname[0] = '\0'; 2061 2062 err = -EINVAL; 2063 ifm = nlmsg_data(nlh); 2064 if (ifm->ifi_index > 0) 2065 dev = __dev_get_by_index(net, ifm->ifi_index); 2066 else if (tb[IFLA_IFNAME]) 2067 dev = __dev_get_by_name(net, ifname); 2068 else 2069 goto errout; 2070 2071 if (dev == NULL) { 2072 err = -ENODEV; 2073 goto errout; 2074 } 2075 2076 err = validate_linkmsg(dev, tb); 2077 if (err < 0) 2078 goto errout; 2079 2080 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 2081 errout: 2082 return err; 2083 } 2084 2085 static int rtnl_group_dellink(const struct net *net, int group) 2086 { 2087 struct net_device *dev, *aux; 2088 LIST_HEAD(list_kill); 2089 bool found = false; 2090 2091 if (!group) 2092 return -EPERM; 2093 2094 for_each_netdev(net, dev) { 2095 if (dev->group == group) { 2096 const struct rtnl_link_ops *ops; 2097 2098 found = true; 2099 ops = dev->rtnl_link_ops; 2100 if (!ops || !ops->dellink) 2101 return -EOPNOTSUPP; 2102 } 2103 } 2104 2105 if (!found) 2106 return -ENODEV; 2107 2108 for_each_netdev_safe(net, dev, aux) { 2109 if (dev->group == group) { 2110 const struct rtnl_link_ops *ops; 2111 2112 ops = dev->rtnl_link_ops; 2113 ops->dellink(dev, &list_kill); 2114 } 2115 } 2116 unregister_netdevice_many(&list_kill); 2117 2118 return 0; 2119 } 2120 2121 int rtnl_delete_link(struct net_device *dev) 2122 { 2123 const struct rtnl_link_ops *ops; 2124 LIST_HEAD(list_kill); 2125 2126 ops = dev->rtnl_link_ops; 2127 if (!ops || !ops->dellink) 2128 return -EOPNOTSUPP; 2129 2130 ops->dellink(dev, &list_kill); 2131 unregister_netdevice_many(&list_kill); 2132 2133 return 0; 2134 } 2135 EXPORT_SYMBOL_GPL(rtnl_delete_link); 2136 2137 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2138 { 2139 struct net *net = sock_net(skb->sk); 2140 struct net_device *dev; 2141 struct ifinfomsg *ifm; 2142 char ifname[IFNAMSIZ]; 2143 struct nlattr *tb[IFLA_MAX+1]; 2144 int err; 2145 2146 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2147 if (err < 0) 2148 return err; 2149 2150 if (tb[IFLA_IFNAME]) 2151 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2152 2153 ifm = nlmsg_data(nlh); 2154 if (ifm->ifi_index > 0) 2155 dev = __dev_get_by_index(net, ifm->ifi_index); 2156 else if (tb[IFLA_IFNAME]) 2157 dev = __dev_get_by_name(net, ifname); 2158 else if (tb[IFLA_GROUP]) 2159 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 2160 else 2161 return -EINVAL; 2162 2163 if (!dev) 2164 return -ENODEV; 2165 2166 return rtnl_delete_link(dev); 2167 } 2168 2169 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 2170 { 2171 unsigned int old_flags; 2172 int err; 2173 2174 old_flags = dev->flags; 2175 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2176 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2177 if (err < 0) 2178 return err; 2179 } 2180 2181 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2182 2183 __dev_notify_flags(dev, old_flags, ~0U); 2184 return 0; 2185 } 2186 EXPORT_SYMBOL(rtnl_configure_link); 2187 2188 struct net_device *rtnl_create_link(struct net *net, 2189 const char *ifname, unsigned char name_assign_type, 2190 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2191 { 2192 int err; 2193 struct net_device *dev; 2194 unsigned int num_tx_queues = 1; 2195 unsigned int num_rx_queues = 1; 2196 2197 if (tb[IFLA_NUM_TX_QUEUES]) 2198 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2199 else if (ops->get_num_tx_queues) 2200 num_tx_queues = ops->get_num_tx_queues(); 2201 2202 if (tb[IFLA_NUM_RX_QUEUES]) 2203 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2204 else if (ops->get_num_rx_queues) 2205 num_rx_queues = ops->get_num_rx_queues(); 2206 2207 err = -ENOMEM; 2208 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2209 ops->setup, num_tx_queues, num_rx_queues); 2210 if (!dev) 2211 goto err; 2212 2213 dev_net_set(dev, net); 2214 dev->rtnl_link_ops = ops; 2215 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2216 2217 if (tb[IFLA_MTU]) 2218 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2219 if (tb[IFLA_ADDRESS]) { 2220 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2221 nla_len(tb[IFLA_ADDRESS])); 2222 dev->addr_assign_type = NET_ADDR_SET; 2223 } 2224 if (tb[IFLA_BROADCAST]) 2225 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2226 nla_len(tb[IFLA_BROADCAST])); 2227 if (tb[IFLA_TXQLEN]) 2228 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2229 if (tb[IFLA_OPERSTATE]) 2230 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2231 if (tb[IFLA_LINKMODE]) 2232 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2233 if (tb[IFLA_GROUP]) 2234 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2235 2236 return dev; 2237 2238 err: 2239 return ERR_PTR(err); 2240 } 2241 EXPORT_SYMBOL(rtnl_create_link); 2242 2243 static int rtnl_group_changelink(const struct sk_buff *skb, 2244 struct net *net, int group, 2245 struct ifinfomsg *ifm, 2246 struct nlattr **tb) 2247 { 2248 struct net_device *dev, *aux; 2249 int err; 2250 2251 for_each_netdev_safe(net, dev, aux) { 2252 if (dev->group == group) { 2253 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2254 if (err < 0) 2255 return err; 2256 } 2257 } 2258 2259 return 0; 2260 } 2261 2262 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2263 { 2264 struct net *net = sock_net(skb->sk); 2265 const struct rtnl_link_ops *ops; 2266 const struct rtnl_link_ops *m_ops = NULL; 2267 struct net_device *dev; 2268 struct net_device *master_dev = NULL; 2269 struct ifinfomsg *ifm; 2270 char kind[MODULE_NAME_LEN]; 2271 char ifname[IFNAMSIZ]; 2272 struct nlattr *tb[IFLA_MAX+1]; 2273 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2274 unsigned char name_assign_type = NET_NAME_USER; 2275 int err; 2276 2277 #ifdef CONFIG_MODULES 2278 replay: 2279 #endif 2280 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2281 if (err < 0) 2282 return err; 2283 2284 if (tb[IFLA_IFNAME]) 2285 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2286 else 2287 ifname[0] = '\0'; 2288 2289 ifm = nlmsg_data(nlh); 2290 if (ifm->ifi_index > 0) 2291 dev = __dev_get_by_index(net, ifm->ifi_index); 2292 else { 2293 if (ifname[0]) 2294 dev = __dev_get_by_name(net, ifname); 2295 else 2296 dev = NULL; 2297 } 2298 2299 if (dev) { 2300 master_dev = netdev_master_upper_dev_get(dev); 2301 if (master_dev) 2302 m_ops = master_dev->rtnl_link_ops; 2303 } 2304 2305 err = validate_linkmsg(dev, tb); 2306 if (err < 0) 2307 return err; 2308 2309 if (tb[IFLA_LINKINFO]) { 2310 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2311 tb[IFLA_LINKINFO], ifla_info_policy); 2312 if (err < 0) 2313 return err; 2314 } else 2315 memset(linkinfo, 0, sizeof(linkinfo)); 2316 2317 if (linkinfo[IFLA_INFO_KIND]) { 2318 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2319 ops = rtnl_link_ops_get(kind); 2320 } else { 2321 kind[0] = '\0'; 2322 ops = NULL; 2323 } 2324 2325 if (1) { 2326 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2327 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2328 struct nlattr **data = NULL; 2329 struct nlattr **slave_data = NULL; 2330 struct net *dest_net, *link_net = NULL; 2331 2332 if (ops) { 2333 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2334 err = nla_parse_nested(attr, ops->maxtype, 2335 linkinfo[IFLA_INFO_DATA], 2336 ops->policy); 2337 if (err < 0) 2338 return err; 2339 data = attr; 2340 } 2341 if (ops->validate) { 2342 err = ops->validate(tb, data); 2343 if (err < 0) 2344 return err; 2345 } 2346 } 2347 2348 if (m_ops) { 2349 if (m_ops->slave_maxtype && 2350 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2351 err = nla_parse_nested(slave_attr, 2352 m_ops->slave_maxtype, 2353 linkinfo[IFLA_INFO_SLAVE_DATA], 2354 m_ops->slave_policy); 2355 if (err < 0) 2356 return err; 2357 slave_data = slave_attr; 2358 } 2359 if (m_ops->slave_validate) { 2360 err = m_ops->slave_validate(tb, slave_data); 2361 if (err < 0) 2362 return err; 2363 } 2364 } 2365 2366 if (dev) { 2367 int status = 0; 2368 2369 if (nlh->nlmsg_flags & NLM_F_EXCL) 2370 return -EEXIST; 2371 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2372 return -EOPNOTSUPP; 2373 2374 if (linkinfo[IFLA_INFO_DATA]) { 2375 if (!ops || ops != dev->rtnl_link_ops || 2376 !ops->changelink) 2377 return -EOPNOTSUPP; 2378 2379 err = ops->changelink(dev, tb, data); 2380 if (err < 0) 2381 return err; 2382 status |= DO_SETLINK_NOTIFY; 2383 } 2384 2385 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2386 if (!m_ops || !m_ops->slave_changelink) 2387 return -EOPNOTSUPP; 2388 2389 err = m_ops->slave_changelink(master_dev, dev, 2390 tb, slave_data); 2391 if (err < 0) 2392 return err; 2393 status |= DO_SETLINK_NOTIFY; 2394 } 2395 2396 return do_setlink(skb, dev, ifm, tb, ifname, status); 2397 } 2398 2399 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2400 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2401 return rtnl_group_changelink(skb, net, 2402 nla_get_u32(tb[IFLA_GROUP]), 2403 ifm, tb); 2404 return -ENODEV; 2405 } 2406 2407 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2408 return -EOPNOTSUPP; 2409 2410 if (!ops) { 2411 #ifdef CONFIG_MODULES 2412 if (kind[0]) { 2413 __rtnl_unlock(); 2414 request_module("rtnl-link-%s", kind); 2415 rtnl_lock(); 2416 ops = rtnl_link_ops_get(kind); 2417 if (ops) 2418 goto replay; 2419 } 2420 #endif 2421 return -EOPNOTSUPP; 2422 } 2423 2424 if (!ops->setup) 2425 return -EOPNOTSUPP; 2426 2427 if (!ifname[0]) { 2428 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2429 name_assign_type = NET_NAME_ENUM; 2430 } 2431 2432 dest_net = rtnl_link_get_net(net, tb); 2433 if (IS_ERR(dest_net)) 2434 return PTR_ERR(dest_net); 2435 2436 err = -EPERM; 2437 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2438 goto out; 2439 2440 if (tb[IFLA_LINK_NETNSID]) { 2441 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2442 2443 link_net = get_net_ns_by_id(dest_net, id); 2444 if (!link_net) { 2445 err = -EINVAL; 2446 goto out; 2447 } 2448 err = -EPERM; 2449 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2450 goto out; 2451 } 2452 2453 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2454 name_assign_type, ops, tb); 2455 if (IS_ERR(dev)) { 2456 err = PTR_ERR(dev); 2457 goto out; 2458 } 2459 2460 dev->ifindex = ifm->ifi_index; 2461 2462 if (ops->newlink) { 2463 err = ops->newlink(link_net ? : net, dev, tb, data); 2464 /* Drivers should call free_netdev() in ->destructor 2465 * and unregister it on failure after registration 2466 * so that device could be finally freed in rtnl_unlock. 2467 */ 2468 if (err < 0) { 2469 /* If device is not registered at all, free it now */ 2470 if (dev->reg_state == NETREG_UNINITIALIZED) 2471 free_netdev(dev); 2472 goto out; 2473 } 2474 } else { 2475 err = register_netdevice(dev); 2476 if (err < 0) { 2477 free_netdev(dev); 2478 goto out; 2479 } 2480 } 2481 err = rtnl_configure_link(dev, ifm); 2482 if (err < 0) 2483 goto out_unregister; 2484 if (link_net) { 2485 err = dev_change_net_namespace(dev, dest_net, ifname); 2486 if (err < 0) 2487 goto out_unregister; 2488 } 2489 out: 2490 if (link_net) 2491 put_net(link_net); 2492 put_net(dest_net); 2493 return err; 2494 out_unregister: 2495 if (ops->newlink) { 2496 LIST_HEAD(list_kill); 2497 2498 ops->dellink(dev, &list_kill); 2499 unregister_netdevice_many(&list_kill); 2500 } else { 2501 unregister_netdevice(dev); 2502 } 2503 goto out; 2504 } 2505 } 2506 2507 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2508 { 2509 struct net *net = sock_net(skb->sk); 2510 struct ifinfomsg *ifm; 2511 char ifname[IFNAMSIZ]; 2512 struct nlattr *tb[IFLA_MAX+1]; 2513 struct net_device *dev = NULL; 2514 struct sk_buff *nskb; 2515 int err; 2516 u32 ext_filter_mask = 0; 2517 2518 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2519 if (err < 0) 2520 return err; 2521 2522 if (tb[IFLA_IFNAME]) 2523 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2524 2525 if (tb[IFLA_EXT_MASK]) 2526 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2527 2528 ifm = nlmsg_data(nlh); 2529 if (ifm->ifi_index > 0) 2530 dev = __dev_get_by_index(net, ifm->ifi_index); 2531 else if (tb[IFLA_IFNAME]) 2532 dev = __dev_get_by_name(net, ifname); 2533 else 2534 return -EINVAL; 2535 2536 if (dev == NULL) 2537 return -ENODEV; 2538 2539 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2540 if (nskb == NULL) 2541 return -ENOBUFS; 2542 2543 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2544 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2545 if (err < 0) { 2546 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2547 WARN_ON(err == -EMSGSIZE); 2548 kfree_skb(nskb); 2549 } else 2550 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2551 2552 return err; 2553 } 2554 2555 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2556 { 2557 struct net *net = sock_net(skb->sk); 2558 struct net_device *dev; 2559 struct nlattr *tb[IFLA_MAX+1]; 2560 u32 ext_filter_mask = 0; 2561 u16 min_ifinfo_dump_size = 0; 2562 int hdrlen; 2563 2564 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2565 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2566 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2567 2568 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2569 if (tb[IFLA_EXT_MASK]) 2570 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2571 } 2572 2573 if (!ext_filter_mask) 2574 return NLMSG_GOODSIZE; 2575 /* 2576 * traverse the list of net devices and compute the minimum 2577 * buffer size based upon the filter mask. 2578 */ 2579 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2580 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2581 if_nlmsg_size(dev, 2582 ext_filter_mask)); 2583 } 2584 2585 return min_ifinfo_dump_size; 2586 } 2587 2588 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2589 { 2590 int idx; 2591 int s_idx = cb->family; 2592 2593 if (s_idx == 0) 2594 s_idx = 1; 2595 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2596 int type = cb->nlh->nlmsg_type-RTM_BASE; 2597 if (idx < s_idx || idx == PF_PACKET) 2598 continue; 2599 if (rtnl_msg_handlers[idx] == NULL || 2600 rtnl_msg_handlers[idx][type].dumpit == NULL) 2601 continue; 2602 if (idx > s_idx) { 2603 memset(&cb->args[0], 0, sizeof(cb->args)); 2604 cb->prev_seq = 0; 2605 cb->seq = 0; 2606 } 2607 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2608 break; 2609 } 2610 cb->family = idx; 2611 2612 return skb->len; 2613 } 2614 2615 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2616 unsigned int change, gfp_t flags) 2617 { 2618 struct net *net = dev_net(dev); 2619 struct sk_buff *skb; 2620 int err = -ENOBUFS; 2621 size_t if_info_size; 2622 2623 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2624 if (skb == NULL) 2625 goto errout; 2626 2627 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2628 if (err < 0) { 2629 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2630 WARN_ON(err == -EMSGSIZE); 2631 kfree_skb(skb); 2632 goto errout; 2633 } 2634 return skb; 2635 errout: 2636 if (err < 0) 2637 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2638 return NULL; 2639 } 2640 2641 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2642 { 2643 struct net *net = dev_net(dev); 2644 2645 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2646 } 2647 2648 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2649 gfp_t flags) 2650 { 2651 struct sk_buff *skb; 2652 2653 if (dev->reg_state != NETREG_REGISTERED) 2654 return; 2655 2656 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2657 if (skb) 2658 rtmsg_ifinfo_send(skb, dev, flags); 2659 } 2660 EXPORT_SYMBOL(rtmsg_ifinfo); 2661 2662 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2663 struct net_device *dev, 2664 u8 *addr, u16 vid, u32 pid, u32 seq, 2665 int type, unsigned int flags, 2666 int nlflags, u16 ndm_state) 2667 { 2668 struct nlmsghdr *nlh; 2669 struct ndmsg *ndm; 2670 2671 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2672 if (!nlh) 2673 return -EMSGSIZE; 2674 2675 ndm = nlmsg_data(nlh); 2676 ndm->ndm_family = AF_BRIDGE; 2677 ndm->ndm_pad1 = 0; 2678 ndm->ndm_pad2 = 0; 2679 ndm->ndm_flags = flags; 2680 ndm->ndm_type = 0; 2681 ndm->ndm_ifindex = dev->ifindex; 2682 ndm->ndm_state = ndm_state; 2683 2684 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2685 goto nla_put_failure; 2686 if (vid) 2687 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2688 goto nla_put_failure; 2689 2690 nlmsg_end(skb, nlh); 2691 return 0; 2692 2693 nla_put_failure: 2694 nlmsg_cancel(skb, nlh); 2695 return -EMSGSIZE; 2696 } 2697 2698 static inline size_t rtnl_fdb_nlmsg_size(void) 2699 { 2700 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2701 } 2702 2703 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 2704 u16 ndm_state) 2705 { 2706 struct net *net = dev_net(dev); 2707 struct sk_buff *skb; 2708 int err = -ENOBUFS; 2709 2710 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2711 if (!skb) 2712 goto errout; 2713 2714 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2715 0, 0, type, NTF_SELF, 0, ndm_state); 2716 if (err < 0) { 2717 kfree_skb(skb); 2718 goto errout; 2719 } 2720 2721 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2722 return; 2723 errout: 2724 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2725 } 2726 2727 /** 2728 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2729 */ 2730 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2731 struct nlattr *tb[], 2732 struct net_device *dev, 2733 const unsigned char *addr, u16 vid, 2734 u16 flags) 2735 { 2736 int err = -EINVAL; 2737 2738 /* If aging addresses are supported device will need to 2739 * implement its own handler for this. 2740 */ 2741 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2742 pr_info("%s: FDB only supports static addresses\n", dev->name); 2743 return err; 2744 } 2745 2746 if (vid) { 2747 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2748 return err; 2749 } 2750 2751 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2752 err = dev_uc_add_excl(dev, addr); 2753 else if (is_multicast_ether_addr(addr)) 2754 err = dev_mc_add_excl(dev, addr); 2755 2756 /* Only return duplicate errors if NLM_F_EXCL is set */ 2757 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2758 err = 0; 2759 2760 return err; 2761 } 2762 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2763 2764 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2765 { 2766 u16 vid = 0; 2767 2768 if (vlan_attr) { 2769 if (nla_len(vlan_attr) != sizeof(u16)) { 2770 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2771 return -EINVAL; 2772 } 2773 2774 vid = nla_get_u16(vlan_attr); 2775 2776 if (!vid || vid >= VLAN_VID_MASK) { 2777 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2778 vid); 2779 return -EINVAL; 2780 } 2781 } 2782 *p_vid = vid; 2783 return 0; 2784 } 2785 2786 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2787 { 2788 struct net *net = sock_net(skb->sk); 2789 struct ndmsg *ndm; 2790 struct nlattr *tb[NDA_MAX+1]; 2791 struct net_device *dev; 2792 u8 *addr; 2793 u16 vid; 2794 int err; 2795 2796 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2797 if (err < 0) 2798 return err; 2799 2800 ndm = nlmsg_data(nlh); 2801 if (ndm->ndm_ifindex == 0) { 2802 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2803 return -EINVAL; 2804 } 2805 2806 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2807 if (dev == NULL) { 2808 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2809 return -ENODEV; 2810 } 2811 2812 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2813 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2814 return -EINVAL; 2815 } 2816 2817 addr = nla_data(tb[NDA_LLADDR]); 2818 2819 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2820 if (err) 2821 return err; 2822 2823 err = -EOPNOTSUPP; 2824 2825 /* Support fdb on master device the net/bridge default case */ 2826 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2827 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2828 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2829 const struct net_device_ops *ops = br_dev->netdev_ops; 2830 2831 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2832 nlh->nlmsg_flags); 2833 if (err) 2834 goto out; 2835 else 2836 ndm->ndm_flags &= ~NTF_MASTER; 2837 } 2838 2839 /* Embedded bridge, macvlan, and any other device support */ 2840 if ((ndm->ndm_flags & NTF_SELF)) { 2841 if (dev->netdev_ops->ndo_fdb_add) 2842 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2843 vid, 2844 nlh->nlmsg_flags); 2845 else 2846 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 2847 nlh->nlmsg_flags); 2848 2849 if (!err) { 2850 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 2851 ndm->ndm_state); 2852 ndm->ndm_flags &= ~NTF_SELF; 2853 } 2854 } 2855 out: 2856 return err; 2857 } 2858 2859 /** 2860 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2861 */ 2862 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2863 struct nlattr *tb[], 2864 struct net_device *dev, 2865 const unsigned char *addr, u16 vid) 2866 { 2867 int err = -EINVAL; 2868 2869 /* If aging addresses are supported device will need to 2870 * implement its own handler for this. 2871 */ 2872 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2873 pr_info("%s: FDB only supports static addresses\n", dev->name); 2874 return err; 2875 } 2876 2877 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2878 err = dev_uc_del(dev, addr); 2879 else if (is_multicast_ether_addr(addr)) 2880 err = dev_mc_del(dev, addr); 2881 2882 return err; 2883 } 2884 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2885 2886 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2887 { 2888 struct net *net = sock_net(skb->sk); 2889 struct ndmsg *ndm; 2890 struct nlattr *tb[NDA_MAX+1]; 2891 struct net_device *dev; 2892 int err = -EINVAL; 2893 __u8 *addr; 2894 u16 vid; 2895 2896 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2897 return -EPERM; 2898 2899 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2900 if (err < 0) 2901 return err; 2902 2903 ndm = nlmsg_data(nlh); 2904 if (ndm->ndm_ifindex == 0) { 2905 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2906 return -EINVAL; 2907 } 2908 2909 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2910 if (dev == NULL) { 2911 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2912 return -ENODEV; 2913 } 2914 2915 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2916 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2917 return -EINVAL; 2918 } 2919 2920 addr = nla_data(tb[NDA_LLADDR]); 2921 2922 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2923 if (err) 2924 return err; 2925 2926 err = -EOPNOTSUPP; 2927 2928 /* Support fdb on master device the net/bridge default case */ 2929 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2930 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2931 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2932 const struct net_device_ops *ops = br_dev->netdev_ops; 2933 2934 if (ops->ndo_fdb_del) 2935 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 2936 2937 if (err) 2938 goto out; 2939 else 2940 ndm->ndm_flags &= ~NTF_MASTER; 2941 } 2942 2943 /* Embedded bridge, macvlan, and any other device support */ 2944 if (ndm->ndm_flags & NTF_SELF) { 2945 if (dev->netdev_ops->ndo_fdb_del) 2946 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 2947 vid); 2948 else 2949 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 2950 2951 if (!err) { 2952 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 2953 ndm->ndm_state); 2954 ndm->ndm_flags &= ~NTF_SELF; 2955 } 2956 } 2957 out: 2958 return err; 2959 } 2960 2961 static int nlmsg_populate_fdb(struct sk_buff *skb, 2962 struct netlink_callback *cb, 2963 struct net_device *dev, 2964 int *idx, 2965 struct netdev_hw_addr_list *list) 2966 { 2967 struct netdev_hw_addr *ha; 2968 int err; 2969 u32 portid, seq; 2970 2971 portid = NETLINK_CB(cb->skb).portid; 2972 seq = cb->nlh->nlmsg_seq; 2973 2974 list_for_each_entry(ha, &list->list, list) { 2975 if (*idx < cb->args[0]) 2976 goto skip; 2977 2978 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 2979 portid, seq, 2980 RTM_NEWNEIGH, NTF_SELF, 2981 NLM_F_MULTI, NUD_PERMANENT); 2982 if (err < 0) 2983 return err; 2984 skip: 2985 *idx += 1; 2986 } 2987 return 0; 2988 } 2989 2990 /** 2991 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2992 * @nlh: netlink message header 2993 * @dev: netdevice 2994 * 2995 * Default netdevice operation to dump the existing unicast address list. 2996 * Returns number of addresses from list put in skb. 2997 */ 2998 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2999 struct netlink_callback *cb, 3000 struct net_device *dev, 3001 struct net_device *filter_dev, 3002 int idx) 3003 { 3004 int err; 3005 3006 netif_addr_lock_bh(dev); 3007 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 3008 if (err) 3009 goto out; 3010 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 3011 out: 3012 netif_addr_unlock_bh(dev); 3013 cb->args[1] = err; 3014 return idx; 3015 } 3016 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 3017 3018 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 3019 { 3020 struct net_device *dev; 3021 struct nlattr *tb[IFLA_MAX+1]; 3022 struct net_device *br_dev = NULL; 3023 const struct net_device_ops *ops = NULL; 3024 const struct net_device_ops *cops = NULL; 3025 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 3026 struct net *net = sock_net(skb->sk); 3027 int brport_idx = 0; 3028 int br_idx = 0; 3029 int idx = 0; 3030 3031 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 3032 ifla_policy) == 0) { 3033 if (tb[IFLA_MASTER]) 3034 br_idx = nla_get_u32(tb[IFLA_MASTER]); 3035 } 3036 3037 brport_idx = ifm->ifi_index; 3038 3039 if (br_idx) { 3040 br_dev = __dev_get_by_index(net, br_idx); 3041 if (!br_dev) 3042 return -ENODEV; 3043 3044 ops = br_dev->netdev_ops; 3045 } 3046 3047 cb->args[1] = 0; 3048 for_each_netdev(net, dev) { 3049 if (brport_idx && (dev->ifindex != brport_idx)) 3050 continue; 3051 3052 if (!br_idx) { /* user did not specify a specific bridge */ 3053 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3054 br_dev = netdev_master_upper_dev_get(dev); 3055 cops = br_dev->netdev_ops; 3056 } 3057 3058 } else { 3059 if (dev != br_dev && 3060 !(dev->priv_flags & IFF_BRIDGE_PORT)) 3061 continue; 3062 3063 if (br_dev != netdev_master_upper_dev_get(dev) && 3064 !(dev->priv_flags & IFF_EBRIDGE)) 3065 continue; 3066 3067 cops = ops; 3068 } 3069 3070 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3071 if (cops && cops->ndo_fdb_dump) 3072 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 3073 idx); 3074 } 3075 if (cb->args[1] == -EMSGSIZE) 3076 break; 3077 3078 if (dev->netdev_ops->ndo_fdb_dump) 3079 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL, 3080 idx); 3081 else 3082 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 3083 if (cb->args[1] == -EMSGSIZE) 3084 break; 3085 3086 cops = NULL; 3087 } 3088 3089 cb->args[0] = idx; 3090 return skb->len; 3091 } 3092 3093 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 3094 unsigned int attrnum, unsigned int flag) 3095 { 3096 if (mask & flag) 3097 return nla_put_u8(skb, attrnum, !!(flags & flag)); 3098 return 0; 3099 } 3100 3101 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 3102 struct net_device *dev, u16 mode, 3103 u32 flags, u32 mask, int nlflags, 3104 u32 filter_mask, 3105 int (*vlan_fill)(struct sk_buff *skb, 3106 struct net_device *dev, 3107 u32 filter_mask)) 3108 { 3109 struct nlmsghdr *nlh; 3110 struct ifinfomsg *ifm; 3111 struct nlattr *br_afspec; 3112 struct nlattr *protinfo; 3113 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 3114 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3115 int err = 0; 3116 3117 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 3118 if (nlh == NULL) 3119 return -EMSGSIZE; 3120 3121 ifm = nlmsg_data(nlh); 3122 ifm->ifi_family = AF_BRIDGE; 3123 ifm->__ifi_pad = 0; 3124 ifm->ifi_type = dev->type; 3125 ifm->ifi_index = dev->ifindex; 3126 ifm->ifi_flags = dev_get_flags(dev); 3127 ifm->ifi_change = 0; 3128 3129 3130 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 3131 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 3132 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 3133 (br_dev && 3134 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 3135 (dev->addr_len && 3136 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 3137 (dev->ifindex != dev_get_iflink(dev) && 3138 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 3139 goto nla_put_failure; 3140 3141 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 3142 if (!br_afspec) 3143 goto nla_put_failure; 3144 3145 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 3146 nla_nest_cancel(skb, br_afspec); 3147 goto nla_put_failure; 3148 } 3149 3150 if (mode != BRIDGE_MODE_UNDEF) { 3151 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 3152 nla_nest_cancel(skb, br_afspec); 3153 goto nla_put_failure; 3154 } 3155 } 3156 if (vlan_fill) { 3157 err = vlan_fill(skb, dev, filter_mask); 3158 if (err) { 3159 nla_nest_cancel(skb, br_afspec); 3160 goto nla_put_failure; 3161 } 3162 } 3163 nla_nest_end(skb, br_afspec); 3164 3165 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 3166 if (!protinfo) 3167 goto nla_put_failure; 3168 3169 if (brport_nla_put_flag(skb, flags, mask, 3170 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 3171 brport_nla_put_flag(skb, flags, mask, 3172 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 3173 brport_nla_put_flag(skb, flags, mask, 3174 IFLA_BRPORT_FAST_LEAVE, 3175 BR_MULTICAST_FAST_LEAVE) || 3176 brport_nla_put_flag(skb, flags, mask, 3177 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 3178 brport_nla_put_flag(skb, flags, mask, 3179 IFLA_BRPORT_LEARNING, BR_LEARNING) || 3180 brport_nla_put_flag(skb, flags, mask, 3181 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 3182 brport_nla_put_flag(skb, flags, mask, 3183 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3184 brport_nla_put_flag(skb, flags, mask, 3185 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3186 nla_nest_cancel(skb, protinfo); 3187 goto nla_put_failure; 3188 } 3189 3190 nla_nest_end(skb, protinfo); 3191 3192 nlmsg_end(skb, nlh); 3193 return 0; 3194 nla_put_failure: 3195 nlmsg_cancel(skb, nlh); 3196 return err ? err : -EMSGSIZE; 3197 } 3198 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3199 3200 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3201 { 3202 struct net *net = sock_net(skb->sk); 3203 struct net_device *dev; 3204 int idx = 0; 3205 u32 portid = NETLINK_CB(cb->skb).portid; 3206 u32 seq = cb->nlh->nlmsg_seq; 3207 u32 filter_mask = 0; 3208 int err; 3209 3210 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3211 struct nlattr *extfilt; 3212 3213 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3214 IFLA_EXT_MASK); 3215 if (extfilt) { 3216 if (nla_len(extfilt) < sizeof(filter_mask)) 3217 return -EINVAL; 3218 3219 filter_mask = nla_get_u32(extfilt); 3220 } 3221 } 3222 3223 rcu_read_lock(); 3224 for_each_netdev_rcu(net, dev) { 3225 const struct net_device_ops *ops = dev->netdev_ops; 3226 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3227 3228 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3229 if (idx >= cb->args[0]) { 3230 err = br_dev->netdev_ops->ndo_bridge_getlink( 3231 skb, portid, seq, dev, 3232 filter_mask, NLM_F_MULTI); 3233 if (err < 0 && err != -EOPNOTSUPP) 3234 break; 3235 } 3236 idx++; 3237 } 3238 3239 if (ops->ndo_bridge_getlink) { 3240 if (idx >= cb->args[0]) { 3241 err = ops->ndo_bridge_getlink(skb, portid, 3242 seq, dev, 3243 filter_mask, 3244 NLM_F_MULTI); 3245 if (err < 0 && err != -EOPNOTSUPP) 3246 break; 3247 } 3248 idx++; 3249 } 3250 } 3251 rcu_read_unlock(); 3252 cb->args[0] = idx; 3253 3254 return skb->len; 3255 } 3256 3257 static inline size_t bridge_nlmsg_size(void) 3258 { 3259 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3260 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3261 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3262 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3263 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3264 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3265 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3266 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3267 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3268 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3269 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3270 } 3271 3272 static int rtnl_bridge_notify(struct net_device *dev) 3273 { 3274 struct net *net = dev_net(dev); 3275 struct sk_buff *skb; 3276 int err = -EOPNOTSUPP; 3277 3278 if (!dev->netdev_ops->ndo_bridge_getlink) 3279 return 0; 3280 3281 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3282 if (!skb) { 3283 err = -ENOMEM; 3284 goto errout; 3285 } 3286 3287 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3288 if (err < 0) 3289 goto errout; 3290 3291 if (!skb->len) 3292 goto errout; 3293 3294 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3295 return 0; 3296 errout: 3297 WARN_ON(err == -EMSGSIZE); 3298 kfree_skb(skb); 3299 if (err) 3300 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3301 return err; 3302 } 3303 3304 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3305 { 3306 struct net *net = sock_net(skb->sk); 3307 struct ifinfomsg *ifm; 3308 struct net_device *dev; 3309 struct nlattr *br_spec, *attr = NULL; 3310 int rem, err = -EOPNOTSUPP; 3311 u16 flags = 0; 3312 bool have_flags = false; 3313 3314 if (nlmsg_len(nlh) < sizeof(*ifm)) 3315 return -EINVAL; 3316 3317 ifm = nlmsg_data(nlh); 3318 if (ifm->ifi_family != AF_BRIDGE) 3319 return -EPFNOSUPPORT; 3320 3321 dev = __dev_get_by_index(net, ifm->ifi_index); 3322 if (!dev) { 3323 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3324 return -ENODEV; 3325 } 3326 3327 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3328 if (br_spec) { 3329 nla_for_each_nested(attr, br_spec, rem) { 3330 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3331 if (nla_len(attr) < sizeof(flags)) 3332 return -EINVAL; 3333 3334 have_flags = true; 3335 flags = nla_get_u16(attr); 3336 break; 3337 } 3338 } 3339 } 3340 3341 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3342 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3343 3344 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3345 err = -EOPNOTSUPP; 3346 goto out; 3347 } 3348 3349 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3350 if (err) 3351 goto out; 3352 3353 flags &= ~BRIDGE_FLAGS_MASTER; 3354 } 3355 3356 if ((flags & BRIDGE_FLAGS_SELF)) { 3357 if (!dev->netdev_ops->ndo_bridge_setlink) 3358 err = -EOPNOTSUPP; 3359 else 3360 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3361 flags); 3362 if (!err) { 3363 flags &= ~BRIDGE_FLAGS_SELF; 3364 3365 /* Generate event to notify upper layer of bridge 3366 * change 3367 */ 3368 err = rtnl_bridge_notify(dev); 3369 } 3370 } 3371 3372 if (have_flags) 3373 memcpy(nla_data(attr), &flags, sizeof(flags)); 3374 out: 3375 return err; 3376 } 3377 3378 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3379 { 3380 struct net *net = sock_net(skb->sk); 3381 struct ifinfomsg *ifm; 3382 struct net_device *dev; 3383 struct nlattr *br_spec, *attr = NULL; 3384 int rem, err = -EOPNOTSUPP; 3385 u16 flags = 0; 3386 bool have_flags = false; 3387 3388 if (nlmsg_len(nlh) < sizeof(*ifm)) 3389 return -EINVAL; 3390 3391 ifm = nlmsg_data(nlh); 3392 if (ifm->ifi_family != AF_BRIDGE) 3393 return -EPFNOSUPPORT; 3394 3395 dev = __dev_get_by_index(net, ifm->ifi_index); 3396 if (!dev) { 3397 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3398 return -ENODEV; 3399 } 3400 3401 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3402 if (br_spec) { 3403 nla_for_each_nested(attr, br_spec, rem) { 3404 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3405 if (nla_len(attr) < sizeof(flags)) 3406 return -EINVAL; 3407 3408 have_flags = true; 3409 flags = nla_get_u16(attr); 3410 break; 3411 } 3412 } 3413 } 3414 3415 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3416 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3417 3418 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3419 err = -EOPNOTSUPP; 3420 goto out; 3421 } 3422 3423 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3424 if (err) 3425 goto out; 3426 3427 flags &= ~BRIDGE_FLAGS_MASTER; 3428 } 3429 3430 if ((flags & BRIDGE_FLAGS_SELF)) { 3431 if (!dev->netdev_ops->ndo_bridge_dellink) 3432 err = -EOPNOTSUPP; 3433 else 3434 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3435 flags); 3436 3437 if (!err) { 3438 flags &= ~BRIDGE_FLAGS_SELF; 3439 3440 /* Generate event to notify upper layer of bridge 3441 * change 3442 */ 3443 err = rtnl_bridge_notify(dev); 3444 } 3445 } 3446 3447 if (have_flags) 3448 memcpy(nla_data(attr), &flags, sizeof(flags)); 3449 out: 3450 return err; 3451 } 3452 3453 /* Process one rtnetlink message. */ 3454 3455 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3456 { 3457 struct net *net = sock_net(skb->sk); 3458 rtnl_doit_func doit; 3459 int kind; 3460 int family; 3461 int type; 3462 int err; 3463 3464 type = nlh->nlmsg_type; 3465 if (type > RTM_MAX) 3466 return -EOPNOTSUPP; 3467 3468 type -= RTM_BASE; 3469 3470 /* All the messages must have at least 1 byte length */ 3471 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3472 return 0; 3473 3474 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3475 kind = type&3; 3476 3477 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3478 return -EPERM; 3479 3480 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 3481 struct sock *rtnl; 3482 rtnl_dumpit_func dumpit; 3483 rtnl_calcit_func calcit; 3484 u16 min_dump_alloc = 0; 3485 3486 dumpit = rtnl_get_dumpit(family, type); 3487 if (dumpit == NULL) 3488 return -EOPNOTSUPP; 3489 calcit = rtnl_get_calcit(family, type); 3490 if (calcit) 3491 min_dump_alloc = calcit(skb, nlh); 3492 3493 __rtnl_unlock(); 3494 rtnl = net->rtnl; 3495 { 3496 struct netlink_dump_control c = { 3497 .dump = dumpit, 3498 .min_dump_alloc = min_dump_alloc, 3499 }; 3500 err = netlink_dump_start(rtnl, skb, nlh, &c); 3501 } 3502 rtnl_lock(); 3503 return err; 3504 } 3505 3506 doit = rtnl_get_doit(family, type); 3507 if (doit == NULL) 3508 return -EOPNOTSUPP; 3509 3510 return doit(skb, nlh); 3511 } 3512 3513 static void rtnetlink_rcv(struct sk_buff *skb) 3514 { 3515 rtnl_lock(); 3516 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 3517 rtnl_unlock(); 3518 } 3519 3520 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 3521 { 3522 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3523 3524 switch (event) { 3525 case NETDEV_UP: 3526 case NETDEV_DOWN: 3527 case NETDEV_PRE_UP: 3528 case NETDEV_POST_INIT: 3529 case NETDEV_REGISTER: 3530 case NETDEV_CHANGE: 3531 case NETDEV_PRE_TYPE_CHANGE: 3532 case NETDEV_GOING_DOWN: 3533 case NETDEV_UNREGISTER: 3534 case NETDEV_UNREGISTER_FINAL: 3535 case NETDEV_RELEASE: 3536 case NETDEV_JOIN: 3537 case NETDEV_BONDING_INFO: 3538 break; 3539 default: 3540 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3541 break; 3542 } 3543 return NOTIFY_DONE; 3544 } 3545 3546 static struct notifier_block rtnetlink_dev_notifier = { 3547 .notifier_call = rtnetlink_event, 3548 }; 3549 3550 3551 static int __net_init rtnetlink_net_init(struct net *net) 3552 { 3553 struct sock *sk; 3554 struct netlink_kernel_cfg cfg = { 3555 .groups = RTNLGRP_MAX, 3556 .input = rtnetlink_rcv, 3557 .cb_mutex = &rtnl_mutex, 3558 .flags = NL_CFG_F_NONROOT_RECV, 3559 }; 3560 3561 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3562 if (!sk) 3563 return -ENOMEM; 3564 net->rtnl = sk; 3565 return 0; 3566 } 3567 3568 static void __net_exit rtnetlink_net_exit(struct net *net) 3569 { 3570 netlink_kernel_release(net->rtnl); 3571 net->rtnl = NULL; 3572 } 3573 3574 static struct pernet_operations rtnetlink_net_ops = { 3575 .init = rtnetlink_net_init, 3576 .exit = rtnetlink_net_exit, 3577 }; 3578 3579 void __init rtnetlink_init(void) 3580 { 3581 if (register_pernet_subsys(&rtnetlink_net_ops)) 3582 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3583 3584 register_netdevice_notifier(&rtnetlink_dev_notifier); 3585 3586 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3587 rtnl_dump_ifinfo, rtnl_calcit); 3588 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3589 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3590 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3591 3592 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3593 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3594 3595 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3596 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3597 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3598 3599 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3600 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3601 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3602 } 3603