1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/slab.h> 31 #include <linux/interrupt.h> 32 #include <linux/capability.h> 33 #include <linux/skbuff.h> 34 #include <linux/init.h> 35 #include <linux/security.h> 36 #include <linux/mutex.h> 37 #include <linux/if_addr.h> 38 #include <linux/if_bridge.h> 39 #include <linux/if_vlan.h> 40 #include <linux/pci.h> 41 #include <linux/etherdevice.h> 42 43 #include <asm/uaccess.h> 44 45 #include <linux/inet.h> 46 #include <linux/netdevice.h> 47 #include <net/switchdev.h> 48 #include <net/ip.h> 49 #include <net/protocol.h> 50 #include <net/arp.h> 51 #include <net/route.h> 52 #include <net/udp.h> 53 #include <net/tcp.h> 54 #include <net/sock.h> 55 #include <net/pkt_sched.h> 56 #include <net/fib_rules.h> 57 #include <net/rtnetlink.h> 58 #include <net/net_namespace.h> 59 60 struct rtnl_link { 61 rtnl_doit_func doit; 62 rtnl_dumpit_func dumpit; 63 rtnl_calcit_func calcit; 64 }; 65 66 static DEFINE_MUTEX(rtnl_mutex); 67 68 void rtnl_lock(void) 69 { 70 mutex_lock(&rtnl_mutex); 71 } 72 EXPORT_SYMBOL(rtnl_lock); 73 74 void __rtnl_unlock(void) 75 { 76 mutex_unlock(&rtnl_mutex); 77 } 78 79 void rtnl_unlock(void) 80 { 81 /* This fellow will unlock it for us. */ 82 netdev_run_todo(); 83 } 84 EXPORT_SYMBOL(rtnl_unlock); 85 86 int rtnl_trylock(void) 87 { 88 return mutex_trylock(&rtnl_mutex); 89 } 90 EXPORT_SYMBOL(rtnl_trylock); 91 92 int rtnl_is_locked(void) 93 { 94 return mutex_is_locked(&rtnl_mutex); 95 } 96 EXPORT_SYMBOL(rtnl_is_locked); 97 98 #ifdef CONFIG_PROVE_LOCKING 99 bool lockdep_rtnl_is_held(void) 100 { 101 return lockdep_is_held(&rtnl_mutex); 102 } 103 EXPORT_SYMBOL(lockdep_rtnl_is_held); 104 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 105 106 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 107 108 static inline int rtm_msgindex(int msgtype) 109 { 110 int msgindex = msgtype - RTM_BASE; 111 112 /* 113 * msgindex < 0 implies someone tried to register a netlink 114 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 115 * the message type has not been added to linux/rtnetlink.h 116 */ 117 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 118 119 return msgindex; 120 } 121 122 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 123 { 124 struct rtnl_link *tab; 125 126 if (protocol <= RTNL_FAMILY_MAX) 127 tab = rtnl_msg_handlers[protocol]; 128 else 129 tab = NULL; 130 131 if (tab == NULL || tab[msgindex].doit == NULL) 132 tab = rtnl_msg_handlers[PF_UNSPEC]; 133 134 return tab[msgindex].doit; 135 } 136 137 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 138 { 139 struct rtnl_link *tab; 140 141 if (protocol <= RTNL_FAMILY_MAX) 142 tab = rtnl_msg_handlers[protocol]; 143 else 144 tab = NULL; 145 146 if (tab == NULL || tab[msgindex].dumpit == NULL) 147 tab = rtnl_msg_handlers[PF_UNSPEC]; 148 149 return tab[msgindex].dumpit; 150 } 151 152 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 153 { 154 struct rtnl_link *tab; 155 156 if (protocol <= RTNL_FAMILY_MAX) 157 tab = rtnl_msg_handlers[protocol]; 158 else 159 tab = NULL; 160 161 if (tab == NULL || tab[msgindex].calcit == NULL) 162 tab = rtnl_msg_handlers[PF_UNSPEC]; 163 164 return tab[msgindex].calcit; 165 } 166 167 /** 168 * __rtnl_register - Register a rtnetlink message type 169 * @protocol: Protocol family or PF_UNSPEC 170 * @msgtype: rtnetlink message type 171 * @doit: Function pointer called for each request message 172 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 173 * @calcit: Function pointer to calc size of dump message 174 * 175 * Registers the specified function pointers (at least one of them has 176 * to be non-NULL) to be called whenever a request message for the 177 * specified protocol family and message type is received. 178 * 179 * The special protocol family PF_UNSPEC may be used to define fallback 180 * function pointers for the case when no entry for the specific protocol 181 * family exists. 182 * 183 * Returns 0 on success or a negative error code. 184 */ 185 int __rtnl_register(int protocol, int msgtype, 186 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 187 rtnl_calcit_func calcit) 188 { 189 struct rtnl_link *tab; 190 int msgindex; 191 192 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 193 msgindex = rtm_msgindex(msgtype); 194 195 tab = rtnl_msg_handlers[protocol]; 196 if (tab == NULL) { 197 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 198 if (tab == NULL) 199 return -ENOBUFS; 200 201 rtnl_msg_handlers[protocol] = tab; 202 } 203 204 if (doit) 205 tab[msgindex].doit = doit; 206 207 if (dumpit) 208 tab[msgindex].dumpit = dumpit; 209 210 if (calcit) 211 tab[msgindex].calcit = calcit; 212 213 return 0; 214 } 215 EXPORT_SYMBOL_GPL(__rtnl_register); 216 217 /** 218 * rtnl_register - Register a rtnetlink message type 219 * 220 * Identical to __rtnl_register() but panics on failure. This is useful 221 * as failure of this function is very unlikely, it can only happen due 222 * to lack of memory when allocating the chain to store all message 223 * handlers for a protocol. Meant for use in init functions where lack 224 * of memory implies no sense in continuing. 225 */ 226 void rtnl_register(int protocol, int msgtype, 227 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 228 rtnl_calcit_func calcit) 229 { 230 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 231 panic("Unable to register rtnetlink message handler, " 232 "protocol = %d, message type = %d\n", 233 protocol, msgtype); 234 } 235 EXPORT_SYMBOL_GPL(rtnl_register); 236 237 /** 238 * rtnl_unregister - Unregister a rtnetlink message type 239 * @protocol: Protocol family or PF_UNSPEC 240 * @msgtype: rtnetlink message type 241 * 242 * Returns 0 on success or a negative error code. 243 */ 244 int rtnl_unregister(int protocol, int msgtype) 245 { 246 int msgindex; 247 248 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 249 msgindex = rtm_msgindex(msgtype); 250 251 if (rtnl_msg_handlers[protocol] == NULL) 252 return -ENOENT; 253 254 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 255 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 256 257 return 0; 258 } 259 EXPORT_SYMBOL_GPL(rtnl_unregister); 260 261 /** 262 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 263 * @protocol : Protocol family or PF_UNSPEC 264 * 265 * Identical to calling rtnl_unregster() for all registered message types 266 * of a certain protocol family. 267 */ 268 void rtnl_unregister_all(int protocol) 269 { 270 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 271 272 kfree(rtnl_msg_handlers[protocol]); 273 rtnl_msg_handlers[protocol] = NULL; 274 } 275 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 276 277 static LIST_HEAD(link_ops); 278 279 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 280 { 281 const struct rtnl_link_ops *ops; 282 283 list_for_each_entry(ops, &link_ops, list) { 284 if (!strcmp(ops->kind, kind)) 285 return ops; 286 } 287 return NULL; 288 } 289 290 /** 291 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 292 * @ops: struct rtnl_link_ops * to register 293 * 294 * The caller must hold the rtnl_mutex. This function should be used 295 * by drivers that create devices during module initialization. It 296 * must be called before registering the devices. 297 * 298 * Returns 0 on success or a negative error code. 299 */ 300 int __rtnl_link_register(struct rtnl_link_ops *ops) 301 { 302 if (rtnl_link_ops_get(ops->kind)) 303 return -EEXIST; 304 305 /* The check for setup is here because if ops 306 * does not have that filled up, it is not possible 307 * to use the ops for creating device. So do not 308 * fill up dellink as well. That disables rtnl_dellink. 309 */ 310 if (ops->setup && !ops->dellink) 311 ops->dellink = unregister_netdevice_queue; 312 313 list_add_tail(&ops->list, &link_ops); 314 return 0; 315 } 316 EXPORT_SYMBOL_GPL(__rtnl_link_register); 317 318 /** 319 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 320 * @ops: struct rtnl_link_ops * to register 321 * 322 * Returns 0 on success or a negative error code. 323 */ 324 int rtnl_link_register(struct rtnl_link_ops *ops) 325 { 326 int err; 327 328 rtnl_lock(); 329 err = __rtnl_link_register(ops); 330 rtnl_unlock(); 331 return err; 332 } 333 EXPORT_SYMBOL_GPL(rtnl_link_register); 334 335 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 336 { 337 struct net_device *dev; 338 LIST_HEAD(list_kill); 339 340 for_each_netdev(net, dev) { 341 if (dev->rtnl_link_ops == ops) 342 ops->dellink(dev, &list_kill); 343 } 344 unregister_netdevice_many(&list_kill); 345 } 346 347 /** 348 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 349 * @ops: struct rtnl_link_ops * to unregister 350 * 351 * The caller must hold the rtnl_mutex. 352 */ 353 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 354 { 355 struct net *net; 356 357 for_each_net(net) { 358 __rtnl_kill_links(net, ops); 359 } 360 list_del(&ops->list); 361 } 362 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 363 364 /* Return with the rtnl_lock held when there are no network 365 * devices unregistering in any network namespace. 366 */ 367 static void rtnl_lock_unregistering_all(void) 368 { 369 struct net *net; 370 bool unregistering; 371 DEFINE_WAIT_FUNC(wait, woken_wake_function); 372 373 add_wait_queue(&netdev_unregistering_wq, &wait); 374 for (;;) { 375 unregistering = false; 376 rtnl_lock(); 377 for_each_net(net) { 378 if (net->dev_unreg_count > 0) { 379 unregistering = true; 380 break; 381 } 382 } 383 if (!unregistering) 384 break; 385 __rtnl_unlock(); 386 387 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 388 } 389 remove_wait_queue(&netdev_unregistering_wq, &wait); 390 } 391 392 /** 393 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 394 * @ops: struct rtnl_link_ops * to unregister 395 */ 396 void rtnl_link_unregister(struct rtnl_link_ops *ops) 397 { 398 /* Close the race with cleanup_net() */ 399 mutex_lock(&net_mutex); 400 rtnl_lock_unregistering_all(); 401 __rtnl_link_unregister(ops); 402 rtnl_unlock(); 403 mutex_unlock(&net_mutex); 404 } 405 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 406 407 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 408 { 409 struct net_device *master_dev; 410 const struct rtnl_link_ops *ops; 411 412 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 413 if (!master_dev) 414 return 0; 415 ops = master_dev->rtnl_link_ops; 416 if (!ops || !ops->get_slave_size) 417 return 0; 418 /* IFLA_INFO_SLAVE_DATA + nested data */ 419 return nla_total_size(sizeof(struct nlattr)) + 420 ops->get_slave_size(master_dev, dev); 421 } 422 423 static size_t rtnl_link_get_size(const struct net_device *dev) 424 { 425 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 426 size_t size; 427 428 if (!ops) 429 return 0; 430 431 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 432 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 433 434 if (ops->get_size) 435 /* IFLA_INFO_DATA + nested data */ 436 size += nla_total_size(sizeof(struct nlattr)) + 437 ops->get_size(dev); 438 439 if (ops->get_xstats_size) 440 /* IFLA_INFO_XSTATS */ 441 size += nla_total_size(ops->get_xstats_size(dev)); 442 443 size += rtnl_link_get_slave_info_data_size(dev); 444 445 return size; 446 } 447 448 static LIST_HEAD(rtnl_af_ops); 449 450 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 451 { 452 const struct rtnl_af_ops *ops; 453 454 list_for_each_entry(ops, &rtnl_af_ops, list) { 455 if (ops->family == family) 456 return ops; 457 } 458 459 return NULL; 460 } 461 462 /** 463 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 464 * @ops: struct rtnl_af_ops * to register 465 * 466 * Returns 0 on success or a negative error code. 467 */ 468 void rtnl_af_register(struct rtnl_af_ops *ops) 469 { 470 rtnl_lock(); 471 list_add_tail(&ops->list, &rtnl_af_ops); 472 rtnl_unlock(); 473 } 474 EXPORT_SYMBOL_GPL(rtnl_af_register); 475 476 /** 477 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 478 * @ops: struct rtnl_af_ops * to unregister 479 * 480 * The caller must hold the rtnl_mutex. 481 */ 482 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 483 { 484 list_del(&ops->list); 485 } 486 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 487 488 /** 489 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 490 * @ops: struct rtnl_af_ops * to unregister 491 */ 492 void rtnl_af_unregister(struct rtnl_af_ops *ops) 493 { 494 rtnl_lock(); 495 __rtnl_af_unregister(ops); 496 rtnl_unlock(); 497 } 498 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 499 500 static size_t rtnl_link_get_af_size(const struct net_device *dev, 501 u32 ext_filter_mask) 502 { 503 struct rtnl_af_ops *af_ops; 504 size_t size; 505 506 /* IFLA_AF_SPEC */ 507 size = nla_total_size(sizeof(struct nlattr)); 508 509 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 510 if (af_ops->get_link_af_size) { 511 /* AF_* + nested data */ 512 size += nla_total_size(sizeof(struct nlattr)) + 513 af_ops->get_link_af_size(dev, ext_filter_mask); 514 } 515 } 516 517 return size; 518 } 519 520 static bool rtnl_have_link_slave_info(const struct net_device *dev) 521 { 522 struct net_device *master_dev; 523 524 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 525 if (master_dev && master_dev->rtnl_link_ops) 526 return true; 527 return false; 528 } 529 530 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 531 const struct net_device *dev) 532 { 533 struct net_device *master_dev; 534 const struct rtnl_link_ops *ops; 535 struct nlattr *slave_data; 536 int err; 537 538 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 539 if (!master_dev) 540 return 0; 541 ops = master_dev->rtnl_link_ops; 542 if (!ops) 543 return 0; 544 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 545 return -EMSGSIZE; 546 if (ops->fill_slave_info) { 547 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA); 548 if (!slave_data) 549 return -EMSGSIZE; 550 err = ops->fill_slave_info(skb, master_dev, dev); 551 if (err < 0) 552 goto err_cancel_slave_data; 553 nla_nest_end(skb, slave_data); 554 } 555 return 0; 556 557 err_cancel_slave_data: 558 nla_nest_cancel(skb, slave_data); 559 return err; 560 } 561 562 static int rtnl_link_info_fill(struct sk_buff *skb, 563 const struct net_device *dev) 564 { 565 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 566 struct nlattr *data; 567 int err; 568 569 if (!ops) 570 return 0; 571 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 572 return -EMSGSIZE; 573 if (ops->fill_xstats) { 574 err = ops->fill_xstats(skb, dev); 575 if (err < 0) 576 return err; 577 } 578 if (ops->fill_info) { 579 data = nla_nest_start(skb, IFLA_INFO_DATA); 580 if (data == NULL) 581 return -EMSGSIZE; 582 err = ops->fill_info(skb, dev); 583 if (err < 0) 584 goto err_cancel_data; 585 nla_nest_end(skb, data); 586 } 587 return 0; 588 589 err_cancel_data: 590 nla_nest_cancel(skb, data); 591 return err; 592 } 593 594 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 595 { 596 struct nlattr *linkinfo; 597 int err = -EMSGSIZE; 598 599 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 600 if (linkinfo == NULL) 601 goto out; 602 603 err = rtnl_link_info_fill(skb, dev); 604 if (err < 0) 605 goto err_cancel_link; 606 607 err = rtnl_link_slave_info_fill(skb, dev); 608 if (err < 0) 609 goto err_cancel_link; 610 611 nla_nest_end(skb, linkinfo); 612 return 0; 613 614 err_cancel_link: 615 nla_nest_cancel(skb, linkinfo); 616 out: 617 return err; 618 } 619 620 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 621 { 622 struct sock *rtnl = net->rtnl; 623 int err = 0; 624 625 NETLINK_CB(skb).dst_group = group; 626 if (echo) 627 atomic_inc(&skb->users); 628 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 629 if (echo) 630 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 631 return err; 632 } 633 634 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 635 { 636 struct sock *rtnl = net->rtnl; 637 638 return nlmsg_unicast(rtnl, skb, pid); 639 } 640 EXPORT_SYMBOL(rtnl_unicast); 641 642 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 643 struct nlmsghdr *nlh, gfp_t flags) 644 { 645 struct sock *rtnl = net->rtnl; 646 int report = 0; 647 648 if (nlh) 649 report = nlmsg_report(nlh); 650 651 nlmsg_notify(rtnl, skb, pid, group, report, flags); 652 } 653 EXPORT_SYMBOL(rtnl_notify); 654 655 void rtnl_set_sk_err(struct net *net, u32 group, int error) 656 { 657 struct sock *rtnl = net->rtnl; 658 659 netlink_set_err(rtnl, 0, group, error); 660 } 661 EXPORT_SYMBOL(rtnl_set_sk_err); 662 663 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 664 { 665 struct nlattr *mx; 666 int i, valid = 0; 667 668 mx = nla_nest_start(skb, RTA_METRICS); 669 if (mx == NULL) 670 return -ENOBUFS; 671 672 for (i = 0; i < RTAX_MAX; i++) { 673 if (metrics[i]) { 674 if (i == RTAX_CC_ALGO - 1) { 675 char tmp[TCP_CA_NAME_MAX], *name; 676 677 name = tcp_ca_get_name_by_key(metrics[i], tmp); 678 if (!name) 679 continue; 680 if (nla_put_string(skb, i + 1, name)) 681 goto nla_put_failure; 682 } else if (i == RTAX_FEATURES - 1) { 683 u32 user_features = metrics[i] & RTAX_FEATURE_MASK; 684 685 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); 686 if (nla_put_u32(skb, i + 1, user_features)) 687 goto nla_put_failure; 688 } else { 689 if (nla_put_u32(skb, i + 1, metrics[i])) 690 goto nla_put_failure; 691 } 692 valid++; 693 } 694 } 695 696 if (!valid) { 697 nla_nest_cancel(skb, mx); 698 return 0; 699 } 700 701 return nla_nest_end(skb, mx); 702 703 nla_put_failure: 704 nla_nest_cancel(skb, mx); 705 return -EMSGSIZE; 706 } 707 EXPORT_SYMBOL(rtnetlink_put_metrics); 708 709 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 710 long expires, u32 error) 711 { 712 struct rta_cacheinfo ci = { 713 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 714 .rta_used = dst->__use, 715 .rta_clntref = atomic_read(&(dst->__refcnt)), 716 .rta_error = error, 717 .rta_id = id, 718 }; 719 720 if (expires) { 721 unsigned long clock; 722 723 clock = jiffies_to_clock_t(abs(expires)); 724 clock = min_t(unsigned long, clock, INT_MAX); 725 ci.rta_expires = (expires > 0) ? clock : -clock; 726 } 727 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 728 } 729 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 730 731 static void set_operstate(struct net_device *dev, unsigned char transition) 732 { 733 unsigned char operstate = dev->operstate; 734 735 switch (transition) { 736 case IF_OPER_UP: 737 if ((operstate == IF_OPER_DORMANT || 738 operstate == IF_OPER_UNKNOWN) && 739 !netif_dormant(dev)) 740 operstate = IF_OPER_UP; 741 break; 742 743 case IF_OPER_DORMANT: 744 if (operstate == IF_OPER_UP || 745 operstate == IF_OPER_UNKNOWN) 746 operstate = IF_OPER_DORMANT; 747 break; 748 } 749 750 if (dev->operstate != operstate) { 751 write_lock_bh(&dev_base_lock); 752 dev->operstate = operstate; 753 write_unlock_bh(&dev_base_lock); 754 netdev_state_change(dev); 755 } 756 } 757 758 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 759 { 760 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 761 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 762 } 763 764 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 765 const struct ifinfomsg *ifm) 766 { 767 unsigned int flags = ifm->ifi_flags; 768 769 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 770 if (ifm->ifi_change) 771 flags = (flags & ifm->ifi_change) | 772 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 773 774 return flags; 775 } 776 777 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 778 const struct rtnl_link_stats64 *b) 779 { 780 a->rx_packets = b->rx_packets; 781 a->tx_packets = b->tx_packets; 782 a->rx_bytes = b->rx_bytes; 783 a->tx_bytes = b->tx_bytes; 784 a->rx_errors = b->rx_errors; 785 a->tx_errors = b->tx_errors; 786 a->rx_dropped = b->rx_dropped; 787 a->tx_dropped = b->tx_dropped; 788 789 a->multicast = b->multicast; 790 a->collisions = b->collisions; 791 792 a->rx_length_errors = b->rx_length_errors; 793 a->rx_over_errors = b->rx_over_errors; 794 a->rx_crc_errors = b->rx_crc_errors; 795 a->rx_frame_errors = b->rx_frame_errors; 796 a->rx_fifo_errors = b->rx_fifo_errors; 797 a->rx_missed_errors = b->rx_missed_errors; 798 799 a->tx_aborted_errors = b->tx_aborted_errors; 800 a->tx_carrier_errors = b->tx_carrier_errors; 801 a->tx_fifo_errors = b->tx_fifo_errors; 802 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 803 a->tx_window_errors = b->tx_window_errors; 804 805 a->rx_compressed = b->rx_compressed; 806 a->tx_compressed = b->tx_compressed; 807 } 808 809 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 810 { 811 memcpy(v, b, sizeof(*b)); 812 } 813 814 /* All VF info */ 815 static inline int rtnl_vfinfo_size(const struct net_device *dev, 816 u32 ext_filter_mask) 817 { 818 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 819 (ext_filter_mask & RTEXT_FILTER_VF)) { 820 int num_vfs = dev_num_vf(dev->dev.parent); 821 size_t size = nla_total_size(sizeof(struct nlattr)); 822 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 823 size += num_vfs * 824 (nla_total_size(sizeof(struct ifla_vf_mac)) + 825 nla_total_size(sizeof(struct ifla_vf_vlan)) + 826 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 827 nla_total_size(sizeof(struct ifla_vf_rate)) + 828 nla_total_size(sizeof(struct ifla_vf_link_state)) + 829 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 830 /* IFLA_VF_STATS_RX_PACKETS */ 831 nla_total_size(sizeof(__u64)) + 832 /* IFLA_VF_STATS_TX_PACKETS */ 833 nla_total_size(sizeof(__u64)) + 834 /* IFLA_VF_STATS_RX_BYTES */ 835 nla_total_size(sizeof(__u64)) + 836 /* IFLA_VF_STATS_TX_BYTES */ 837 nla_total_size(sizeof(__u64)) + 838 /* IFLA_VF_STATS_BROADCAST */ 839 nla_total_size(sizeof(__u64)) + 840 /* IFLA_VF_STATS_MULTICAST */ 841 nla_total_size(sizeof(__u64)) + 842 nla_total_size(sizeof(struct ifla_vf_trust))); 843 return size; 844 } else 845 return 0; 846 } 847 848 static size_t rtnl_port_size(const struct net_device *dev, 849 u32 ext_filter_mask) 850 { 851 size_t port_size = nla_total_size(4) /* PORT_VF */ 852 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 853 + nla_total_size(sizeof(struct ifla_port_vsi)) 854 /* PORT_VSI_TYPE */ 855 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 856 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 857 + nla_total_size(1) /* PROT_VDP_REQUEST */ 858 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 859 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 860 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 861 + port_size; 862 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 863 + port_size; 864 865 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 866 !(ext_filter_mask & RTEXT_FILTER_VF)) 867 return 0; 868 if (dev_num_vf(dev->dev.parent)) 869 return port_self_size + vf_ports_size + 870 vf_port_size * dev_num_vf(dev->dev.parent); 871 else 872 return port_self_size; 873 } 874 875 static noinline size_t if_nlmsg_size(const struct net_device *dev, 876 u32 ext_filter_mask) 877 { 878 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 879 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 880 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 881 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 882 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 883 + nla_total_size(sizeof(struct rtnl_link_stats)) 884 + nla_total_size(sizeof(struct rtnl_link_stats64)) 885 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 886 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 887 + nla_total_size(4) /* IFLA_TXQLEN */ 888 + nla_total_size(4) /* IFLA_WEIGHT */ 889 + nla_total_size(4) /* IFLA_MTU */ 890 + nla_total_size(4) /* IFLA_LINK */ 891 + nla_total_size(4) /* IFLA_MASTER */ 892 + nla_total_size(1) /* IFLA_CARRIER */ 893 + nla_total_size(4) /* IFLA_PROMISCUITY */ 894 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 895 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 896 + nla_total_size(1) /* IFLA_OPERSTATE */ 897 + nla_total_size(1) /* IFLA_LINKMODE */ 898 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 899 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 900 + nla_total_size(ext_filter_mask 901 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 902 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 903 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 904 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 905 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 906 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 907 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 908 + nla_total_size(1); /* IFLA_PROTO_DOWN */ 909 910 } 911 912 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 913 { 914 struct nlattr *vf_ports; 915 struct nlattr *vf_port; 916 int vf; 917 int err; 918 919 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 920 if (!vf_ports) 921 return -EMSGSIZE; 922 923 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 924 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 925 if (!vf_port) 926 goto nla_put_failure; 927 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 928 goto nla_put_failure; 929 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 930 if (err == -EMSGSIZE) 931 goto nla_put_failure; 932 if (err) { 933 nla_nest_cancel(skb, vf_port); 934 continue; 935 } 936 nla_nest_end(skb, vf_port); 937 } 938 939 nla_nest_end(skb, vf_ports); 940 941 return 0; 942 943 nla_put_failure: 944 nla_nest_cancel(skb, vf_ports); 945 return -EMSGSIZE; 946 } 947 948 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 949 { 950 struct nlattr *port_self; 951 int err; 952 953 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 954 if (!port_self) 955 return -EMSGSIZE; 956 957 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 958 if (err) { 959 nla_nest_cancel(skb, port_self); 960 return (err == -EMSGSIZE) ? err : 0; 961 } 962 963 nla_nest_end(skb, port_self); 964 965 return 0; 966 } 967 968 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 969 u32 ext_filter_mask) 970 { 971 int err; 972 973 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 974 !(ext_filter_mask & RTEXT_FILTER_VF)) 975 return 0; 976 977 err = rtnl_port_self_fill(skb, dev); 978 if (err) 979 return err; 980 981 if (dev_num_vf(dev->dev.parent)) { 982 err = rtnl_vf_ports_fill(skb, dev); 983 if (err) 984 return err; 985 } 986 987 return 0; 988 } 989 990 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 991 { 992 int err; 993 struct netdev_phys_item_id ppid; 994 995 err = dev_get_phys_port_id(dev, &ppid); 996 if (err) { 997 if (err == -EOPNOTSUPP) 998 return 0; 999 return err; 1000 } 1001 1002 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1003 return -EMSGSIZE; 1004 1005 return 0; 1006 } 1007 1008 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1009 { 1010 char name[IFNAMSIZ]; 1011 int err; 1012 1013 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1014 if (err) { 1015 if (err == -EOPNOTSUPP) 1016 return 0; 1017 return err; 1018 } 1019 1020 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 1021 return -EMSGSIZE; 1022 1023 return 0; 1024 } 1025 1026 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1027 { 1028 int err; 1029 struct switchdev_attr attr = { 1030 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 1031 .flags = SWITCHDEV_F_NO_RECURSE, 1032 }; 1033 1034 err = switchdev_port_attr_get(dev, &attr); 1035 if (err) { 1036 if (err == -EOPNOTSUPP) 1037 return 0; 1038 return err; 1039 } 1040 1041 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1042 attr.u.ppid.id)) 1043 return -EMSGSIZE; 1044 1045 return 0; 1046 } 1047 1048 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1049 struct net_device *dev) 1050 { 1051 const struct rtnl_link_stats64 *stats; 1052 struct rtnl_link_stats64 temp; 1053 struct nlattr *attr; 1054 1055 stats = dev_get_stats(dev, &temp); 1056 1057 attr = nla_reserve(skb, IFLA_STATS, 1058 sizeof(struct rtnl_link_stats)); 1059 if (!attr) 1060 return -EMSGSIZE; 1061 1062 copy_rtnl_link_stats(nla_data(attr), stats); 1063 1064 attr = nla_reserve(skb, IFLA_STATS64, 1065 sizeof(struct rtnl_link_stats64)); 1066 if (!attr) 1067 return -EMSGSIZE; 1068 1069 copy_rtnl_link_stats64(nla_data(attr), stats); 1070 1071 return 0; 1072 } 1073 1074 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1075 struct net_device *dev, 1076 int vfs_num, 1077 struct nlattr *vfinfo) 1078 { 1079 struct ifla_vf_rss_query_en vf_rss_query_en; 1080 struct ifla_vf_link_state vf_linkstate; 1081 struct ifla_vf_spoofchk vf_spoofchk; 1082 struct ifla_vf_tx_rate vf_tx_rate; 1083 struct ifla_vf_stats vf_stats; 1084 struct ifla_vf_trust vf_trust; 1085 struct ifla_vf_vlan vf_vlan; 1086 struct ifla_vf_rate vf_rate; 1087 struct nlattr *vf, *vfstats; 1088 struct ifla_vf_mac vf_mac; 1089 struct ifla_vf_info ivi; 1090 1091 /* Not all SR-IOV capable drivers support the 1092 * spoofcheck and "RSS query enable" query. Preset to 1093 * -1 so the user space tool can detect that the driver 1094 * didn't report anything. 1095 */ 1096 ivi.spoofchk = -1; 1097 ivi.rss_query_en = -1; 1098 ivi.trusted = -1; 1099 memset(ivi.mac, 0, sizeof(ivi.mac)); 1100 /* The default value for VF link state is "auto" 1101 * IFLA_VF_LINK_STATE_AUTO which equals zero 1102 */ 1103 ivi.linkstate = 0; 1104 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1105 return 0; 1106 1107 vf_mac.vf = 1108 vf_vlan.vf = 1109 vf_rate.vf = 1110 vf_tx_rate.vf = 1111 vf_spoofchk.vf = 1112 vf_linkstate.vf = 1113 vf_rss_query_en.vf = 1114 vf_trust.vf = ivi.vf; 1115 1116 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1117 vf_vlan.vlan = ivi.vlan; 1118 vf_vlan.qos = ivi.qos; 1119 vf_tx_rate.rate = ivi.max_tx_rate; 1120 vf_rate.min_tx_rate = ivi.min_tx_rate; 1121 vf_rate.max_tx_rate = ivi.max_tx_rate; 1122 vf_spoofchk.setting = ivi.spoofchk; 1123 vf_linkstate.link_state = ivi.linkstate; 1124 vf_rss_query_en.setting = ivi.rss_query_en; 1125 vf_trust.setting = ivi.trusted; 1126 vf = nla_nest_start(skb, IFLA_VF_INFO); 1127 if (!vf) { 1128 nla_nest_cancel(skb, vfinfo); 1129 return -EMSGSIZE; 1130 } 1131 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1132 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1133 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1134 &vf_rate) || 1135 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1136 &vf_tx_rate) || 1137 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1138 &vf_spoofchk) || 1139 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1140 &vf_linkstate) || 1141 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1142 sizeof(vf_rss_query_en), 1143 &vf_rss_query_en) || 1144 nla_put(skb, IFLA_VF_TRUST, 1145 sizeof(vf_trust), &vf_trust)) 1146 return -EMSGSIZE; 1147 memset(&vf_stats, 0, sizeof(vf_stats)); 1148 if (dev->netdev_ops->ndo_get_vf_stats) 1149 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1150 &vf_stats); 1151 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1152 if (!vfstats) { 1153 nla_nest_cancel(skb, vf); 1154 nla_nest_cancel(skb, vfinfo); 1155 return -EMSGSIZE; 1156 } 1157 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS, 1158 vf_stats.rx_packets) || 1159 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS, 1160 vf_stats.tx_packets) || 1161 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES, 1162 vf_stats.rx_bytes) || 1163 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES, 1164 vf_stats.tx_bytes) || 1165 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST, 1166 vf_stats.broadcast) || 1167 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST, 1168 vf_stats.multicast)) 1169 return -EMSGSIZE; 1170 nla_nest_end(skb, vfstats); 1171 nla_nest_end(skb, vf); 1172 return 0; 1173 } 1174 1175 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1176 { 1177 struct rtnl_link_ifmap map = { 1178 .mem_start = dev->mem_start, 1179 .mem_end = dev->mem_end, 1180 .base_addr = dev->base_addr, 1181 .irq = dev->irq, 1182 .dma = dev->dma, 1183 .port = dev->if_port, 1184 }; 1185 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1186 return -EMSGSIZE; 1187 1188 return 0; 1189 } 1190 1191 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1192 int type, u32 pid, u32 seq, u32 change, 1193 unsigned int flags, u32 ext_filter_mask) 1194 { 1195 struct ifinfomsg *ifm; 1196 struct nlmsghdr *nlh; 1197 struct nlattr *af_spec; 1198 struct rtnl_af_ops *af_ops; 1199 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1200 1201 ASSERT_RTNL(); 1202 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1203 if (nlh == NULL) 1204 return -EMSGSIZE; 1205 1206 ifm = nlmsg_data(nlh); 1207 ifm->ifi_family = AF_UNSPEC; 1208 ifm->__ifi_pad = 0; 1209 ifm->ifi_type = dev->type; 1210 ifm->ifi_index = dev->ifindex; 1211 ifm->ifi_flags = dev_get_flags(dev); 1212 ifm->ifi_change = change; 1213 1214 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1215 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1216 nla_put_u8(skb, IFLA_OPERSTATE, 1217 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1218 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1219 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1220 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1221 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1222 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1223 #ifdef CONFIG_RPS 1224 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1225 #endif 1226 (dev->ifindex != dev_get_iflink(dev) && 1227 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1228 (upper_dev && 1229 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1230 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1231 (dev->qdisc && 1232 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1233 (dev->ifalias && 1234 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1235 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1236 atomic_read(&dev->carrier_changes)) || 1237 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1238 goto nla_put_failure; 1239 1240 if (rtnl_fill_link_ifmap(skb, dev)) 1241 goto nla_put_failure; 1242 1243 if (dev->addr_len) { 1244 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1245 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1246 goto nla_put_failure; 1247 } 1248 1249 if (rtnl_phys_port_id_fill(skb, dev)) 1250 goto nla_put_failure; 1251 1252 if (rtnl_phys_port_name_fill(skb, dev)) 1253 goto nla_put_failure; 1254 1255 if (rtnl_phys_switch_id_fill(skb, dev)) 1256 goto nla_put_failure; 1257 1258 if (rtnl_fill_stats(skb, dev)) 1259 goto nla_put_failure; 1260 1261 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1262 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1263 goto nla_put_failure; 1264 1265 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent && 1266 ext_filter_mask & RTEXT_FILTER_VF) { 1267 int i; 1268 struct nlattr *vfinfo; 1269 int num_vfs = dev_num_vf(dev->dev.parent); 1270 1271 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1272 if (!vfinfo) 1273 goto nla_put_failure; 1274 for (i = 0; i < num_vfs; i++) { 1275 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1276 goto nla_put_failure; 1277 } 1278 1279 nla_nest_end(skb, vfinfo); 1280 } 1281 1282 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1283 goto nla_put_failure; 1284 1285 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1286 if (rtnl_link_fill(skb, dev) < 0) 1287 goto nla_put_failure; 1288 } 1289 1290 if (dev->rtnl_link_ops && 1291 dev->rtnl_link_ops->get_link_net) { 1292 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1293 1294 if (!net_eq(dev_net(dev), link_net)) { 1295 int id = peernet2id_alloc(dev_net(dev), link_net); 1296 1297 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1298 goto nla_put_failure; 1299 } 1300 } 1301 1302 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1303 goto nla_put_failure; 1304 1305 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1306 if (af_ops->fill_link_af) { 1307 struct nlattr *af; 1308 int err; 1309 1310 if (!(af = nla_nest_start(skb, af_ops->family))) 1311 goto nla_put_failure; 1312 1313 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1314 1315 /* 1316 * Caller may return ENODATA to indicate that there 1317 * was no data to be dumped. This is not an error, it 1318 * means we should trim the attribute header and 1319 * continue. 1320 */ 1321 if (err == -ENODATA) 1322 nla_nest_cancel(skb, af); 1323 else if (err < 0) 1324 goto nla_put_failure; 1325 1326 nla_nest_end(skb, af); 1327 } 1328 } 1329 1330 nla_nest_end(skb, af_spec); 1331 1332 nlmsg_end(skb, nlh); 1333 return 0; 1334 1335 nla_put_failure: 1336 nlmsg_cancel(skb, nlh); 1337 return -EMSGSIZE; 1338 } 1339 1340 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1341 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1342 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1343 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1344 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1345 [IFLA_MTU] = { .type = NLA_U32 }, 1346 [IFLA_LINK] = { .type = NLA_U32 }, 1347 [IFLA_MASTER] = { .type = NLA_U32 }, 1348 [IFLA_CARRIER] = { .type = NLA_U8 }, 1349 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1350 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1351 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1352 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1353 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1354 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1355 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1356 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1357 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1358 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1359 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1360 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1361 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1362 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1363 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1364 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1365 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1366 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1367 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1368 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1369 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1370 }; 1371 1372 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1373 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1374 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1375 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1376 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1377 }; 1378 1379 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1380 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1381 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1382 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1383 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1384 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1385 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1386 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1387 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1388 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1389 }; 1390 1391 static const struct nla_policy ifla_vf_stats_policy[IFLA_VF_STATS_MAX + 1] = { 1392 [IFLA_VF_STATS_RX_PACKETS] = { .type = NLA_U64 }, 1393 [IFLA_VF_STATS_TX_PACKETS] = { .type = NLA_U64 }, 1394 [IFLA_VF_STATS_RX_BYTES] = { .type = NLA_U64 }, 1395 [IFLA_VF_STATS_TX_BYTES] = { .type = NLA_U64 }, 1396 [IFLA_VF_STATS_BROADCAST] = { .type = NLA_U64 }, 1397 [IFLA_VF_STATS_MULTICAST] = { .type = NLA_U64 }, 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 int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1415 { 1416 struct net *net = sock_net(skb->sk); 1417 int h, s_h; 1418 int idx = 0, s_idx; 1419 struct net_device *dev; 1420 struct hlist_head *head; 1421 struct nlattr *tb[IFLA_MAX+1]; 1422 u32 ext_filter_mask = 0; 1423 int err; 1424 int hdrlen; 1425 1426 s_h = cb->args[0]; 1427 s_idx = cb->args[1]; 1428 1429 cb->seq = net->dev_base_seq; 1430 1431 /* A hack to preserve kernel<->userspace interface. 1432 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1433 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1434 * what iproute2 < v3.9.0 used. 1435 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1436 * attribute, its netlink message is shorter than struct ifinfomsg. 1437 */ 1438 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1439 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1440 1441 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1442 1443 if (tb[IFLA_EXT_MASK]) 1444 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1445 } 1446 1447 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1448 idx = 0; 1449 head = &net->dev_index_head[h]; 1450 hlist_for_each_entry(dev, head, index_hlist) { 1451 if (idx < s_idx) 1452 goto cont; 1453 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1454 NETLINK_CB(cb->skb).portid, 1455 cb->nlh->nlmsg_seq, 0, 1456 NLM_F_MULTI, 1457 ext_filter_mask); 1458 /* If we ran out of room on the first message, 1459 * we're in trouble 1460 */ 1461 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1462 1463 if (err < 0) 1464 goto out; 1465 1466 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1467 cont: 1468 idx++; 1469 } 1470 } 1471 out: 1472 cb->args[1] = idx; 1473 cb->args[0] = h; 1474 1475 return skb->len; 1476 } 1477 1478 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1479 { 1480 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1481 } 1482 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1483 1484 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1485 { 1486 struct net *net; 1487 /* Examine the link attributes and figure out which 1488 * network namespace we are talking about. 1489 */ 1490 if (tb[IFLA_NET_NS_PID]) 1491 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1492 else if (tb[IFLA_NET_NS_FD]) 1493 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1494 else 1495 net = get_net(src_net); 1496 return net; 1497 } 1498 EXPORT_SYMBOL(rtnl_link_get_net); 1499 1500 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1501 { 1502 if (dev) { 1503 if (tb[IFLA_ADDRESS] && 1504 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1505 return -EINVAL; 1506 1507 if (tb[IFLA_BROADCAST] && 1508 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1509 return -EINVAL; 1510 } 1511 1512 if (tb[IFLA_AF_SPEC]) { 1513 struct nlattr *af; 1514 int rem, err; 1515 1516 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1517 const struct rtnl_af_ops *af_ops; 1518 1519 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1520 return -EAFNOSUPPORT; 1521 1522 if (!af_ops->set_link_af) 1523 return -EOPNOTSUPP; 1524 1525 if (af_ops->validate_link_af) { 1526 err = af_ops->validate_link_af(dev, af); 1527 if (err < 0) 1528 return err; 1529 } 1530 } 1531 } 1532 1533 return 0; 1534 } 1535 1536 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 1537 { 1538 const struct net_device_ops *ops = dev->netdev_ops; 1539 int err = -EINVAL; 1540 1541 if (tb[IFLA_VF_MAC]) { 1542 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 1543 1544 err = -EOPNOTSUPP; 1545 if (ops->ndo_set_vf_mac) 1546 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1547 ivm->mac); 1548 if (err < 0) 1549 return err; 1550 } 1551 1552 if (tb[IFLA_VF_VLAN]) { 1553 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 1554 1555 err = -EOPNOTSUPP; 1556 if (ops->ndo_set_vf_vlan) 1557 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 1558 ivv->qos); 1559 if (err < 0) 1560 return err; 1561 } 1562 1563 if (tb[IFLA_VF_TX_RATE]) { 1564 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1565 struct ifla_vf_info ivf; 1566 1567 err = -EOPNOTSUPP; 1568 if (ops->ndo_get_vf_config) 1569 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 1570 if (err < 0) 1571 return err; 1572 1573 err = -EOPNOTSUPP; 1574 if (ops->ndo_set_vf_rate) 1575 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1576 ivf.min_tx_rate, 1577 ivt->rate); 1578 if (err < 0) 1579 return err; 1580 } 1581 1582 if (tb[IFLA_VF_RATE]) { 1583 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 1584 1585 err = -EOPNOTSUPP; 1586 if (ops->ndo_set_vf_rate) 1587 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1588 ivt->min_tx_rate, 1589 ivt->max_tx_rate); 1590 if (err < 0) 1591 return err; 1592 } 1593 1594 if (tb[IFLA_VF_SPOOFCHK]) { 1595 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 1596 1597 err = -EOPNOTSUPP; 1598 if (ops->ndo_set_vf_spoofchk) 1599 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1600 ivs->setting); 1601 if (err < 0) 1602 return err; 1603 } 1604 1605 if (tb[IFLA_VF_LINK_STATE]) { 1606 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 1607 1608 err = -EOPNOTSUPP; 1609 if (ops->ndo_set_vf_link_state) 1610 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1611 ivl->link_state); 1612 if (err < 0) 1613 return err; 1614 } 1615 1616 if (tb[IFLA_VF_RSS_QUERY_EN]) { 1617 struct ifla_vf_rss_query_en *ivrssq_en; 1618 1619 err = -EOPNOTSUPP; 1620 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 1621 if (ops->ndo_set_vf_rss_query_en) 1622 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 1623 ivrssq_en->setting); 1624 if (err < 0) 1625 return err; 1626 } 1627 1628 if (tb[IFLA_VF_TRUST]) { 1629 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 1630 1631 err = -EOPNOTSUPP; 1632 if (ops->ndo_set_vf_trust) 1633 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 1634 if (err < 0) 1635 return err; 1636 } 1637 1638 return err; 1639 } 1640 1641 static int do_set_master(struct net_device *dev, int ifindex) 1642 { 1643 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1644 const struct net_device_ops *ops; 1645 int err; 1646 1647 if (upper_dev) { 1648 if (upper_dev->ifindex == ifindex) 1649 return 0; 1650 ops = upper_dev->netdev_ops; 1651 if (ops->ndo_del_slave) { 1652 err = ops->ndo_del_slave(upper_dev, dev); 1653 if (err) 1654 return err; 1655 } else { 1656 return -EOPNOTSUPP; 1657 } 1658 } 1659 1660 if (ifindex) { 1661 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1662 if (!upper_dev) 1663 return -EINVAL; 1664 ops = upper_dev->netdev_ops; 1665 if (ops->ndo_add_slave) { 1666 err = ops->ndo_add_slave(upper_dev, dev); 1667 if (err) 1668 return err; 1669 } else { 1670 return -EOPNOTSUPP; 1671 } 1672 } 1673 return 0; 1674 } 1675 1676 #define DO_SETLINK_MODIFIED 0x01 1677 /* notify flag means notify + modified. */ 1678 #define DO_SETLINK_NOTIFY 0x03 1679 static int do_setlink(const struct sk_buff *skb, 1680 struct net_device *dev, struct ifinfomsg *ifm, 1681 struct nlattr **tb, char *ifname, int status) 1682 { 1683 const struct net_device_ops *ops = dev->netdev_ops; 1684 int err; 1685 1686 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1687 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1688 if (IS_ERR(net)) { 1689 err = PTR_ERR(net); 1690 goto errout; 1691 } 1692 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1693 put_net(net); 1694 err = -EPERM; 1695 goto errout; 1696 } 1697 err = dev_change_net_namespace(dev, net, ifname); 1698 put_net(net); 1699 if (err) 1700 goto errout; 1701 status |= DO_SETLINK_MODIFIED; 1702 } 1703 1704 if (tb[IFLA_MAP]) { 1705 struct rtnl_link_ifmap *u_map; 1706 struct ifmap k_map; 1707 1708 if (!ops->ndo_set_config) { 1709 err = -EOPNOTSUPP; 1710 goto errout; 1711 } 1712 1713 if (!netif_device_present(dev)) { 1714 err = -ENODEV; 1715 goto errout; 1716 } 1717 1718 u_map = nla_data(tb[IFLA_MAP]); 1719 k_map.mem_start = (unsigned long) u_map->mem_start; 1720 k_map.mem_end = (unsigned long) u_map->mem_end; 1721 k_map.base_addr = (unsigned short) u_map->base_addr; 1722 k_map.irq = (unsigned char) u_map->irq; 1723 k_map.dma = (unsigned char) u_map->dma; 1724 k_map.port = (unsigned char) u_map->port; 1725 1726 err = ops->ndo_set_config(dev, &k_map); 1727 if (err < 0) 1728 goto errout; 1729 1730 status |= DO_SETLINK_NOTIFY; 1731 } 1732 1733 if (tb[IFLA_ADDRESS]) { 1734 struct sockaddr *sa; 1735 int len; 1736 1737 len = sizeof(sa_family_t) + dev->addr_len; 1738 sa = kmalloc(len, GFP_KERNEL); 1739 if (!sa) { 1740 err = -ENOMEM; 1741 goto errout; 1742 } 1743 sa->sa_family = dev->type; 1744 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1745 dev->addr_len); 1746 err = dev_set_mac_address(dev, sa); 1747 kfree(sa); 1748 if (err) 1749 goto errout; 1750 status |= DO_SETLINK_MODIFIED; 1751 } 1752 1753 if (tb[IFLA_MTU]) { 1754 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1755 if (err < 0) 1756 goto errout; 1757 status |= DO_SETLINK_MODIFIED; 1758 } 1759 1760 if (tb[IFLA_GROUP]) { 1761 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1762 status |= DO_SETLINK_NOTIFY; 1763 } 1764 1765 /* 1766 * Interface selected by interface index but interface 1767 * name provided implies that a name change has been 1768 * requested. 1769 */ 1770 if (ifm->ifi_index > 0 && ifname[0]) { 1771 err = dev_change_name(dev, ifname); 1772 if (err < 0) 1773 goto errout; 1774 status |= DO_SETLINK_MODIFIED; 1775 } 1776 1777 if (tb[IFLA_IFALIAS]) { 1778 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1779 nla_len(tb[IFLA_IFALIAS])); 1780 if (err < 0) 1781 goto errout; 1782 status |= DO_SETLINK_NOTIFY; 1783 } 1784 1785 if (tb[IFLA_BROADCAST]) { 1786 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1787 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1788 } 1789 1790 if (ifm->ifi_flags || ifm->ifi_change) { 1791 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1792 if (err < 0) 1793 goto errout; 1794 } 1795 1796 if (tb[IFLA_MASTER]) { 1797 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1798 if (err) 1799 goto errout; 1800 status |= DO_SETLINK_MODIFIED; 1801 } 1802 1803 if (tb[IFLA_CARRIER]) { 1804 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1805 if (err) 1806 goto errout; 1807 status |= DO_SETLINK_MODIFIED; 1808 } 1809 1810 if (tb[IFLA_TXQLEN]) { 1811 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1812 1813 if (dev->tx_queue_len ^ value) 1814 status |= DO_SETLINK_NOTIFY; 1815 1816 dev->tx_queue_len = value; 1817 } 1818 1819 if (tb[IFLA_OPERSTATE]) 1820 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1821 1822 if (tb[IFLA_LINKMODE]) { 1823 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1824 1825 write_lock_bh(&dev_base_lock); 1826 if (dev->link_mode ^ value) 1827 status |= DO_SETLINK_NOTIFY; 1828 dev->link_mode = value; 1829 write_unlock_bh(&dev_base_lock); 1830 } 1831 1832 if (tb[IFLA_VFINFO_LIST]) { 1833 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 1834 struct nlattr *attr; 1835 int rem; 1836 1837 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1838 if (nla_type(attr) != IFLA_VF_INFO || 1839 nla_len(attr) < NLA_HDRLEN) { 1840 err = -EINVAL; 1841 goto errout; 1842 } 1843 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 1844 ifla_vf_policy); 1845 if (err < 0) 1846 goto errout; 1847 err = do_setvfinfo(dev, vfinfo); 1848 if (err < 0) 1849 goto errout; 1850 status |= DO_SETLINK_NOTIFY; 1851 } 1852 } 1853 err = 0; 1854 1855 if (tb[IFLA_VF_PORTS]) { 1856 struct nlattr *port[IFLA_PORT_MAX+1]; 1857 struct nlattr *attr; 1858 int vf; 1859 int rem; 1860 1861 err = -EOPNOTSUPP; 1862 if (!ops->ndo_set_vf_port) 1863 goto errout; 1864 1865 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1866 if (nla_type(attr) != IFLA_VF_PORT || 1867 nla_len(attr) < NLA_HDRLEN) { 1868 err = -EINVAL; 1869 goto errout; 1870 } 1871 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 1872 ifla_port_policy); 1873 if (err < 0) 1874 goto errout; 1875 if (!port[IFLA_PORT_VF]) { 1876 err = -EOPNOTSUPP; 1877 goto errout; 1878 } 1879 vf = nla_get_u32(port[IFLA_PORT_VF]); 1880 err = ops->ndo_set_vf_port(dev, vf, port); 1881 if (err < 0) 1882 goto errout; 1883 status |= DO_SETLINK_NOTIFY; 1884 } 1885 } 1886 err = 0; 1887 1888 if (tb[IFLA_PORT_SELF]) { 1889 struct nlattr *port[IFLA_PORT_MAX+1]; 1890 1891 err = nla_parse_nested(port, IFLA_PORT_MAX, 1892 tb[IFLA_PORT_SELF], ifla_port_policy); 1893 if (err < 0) 1894 goto errout; 1895 1896 err = -EOPNOTSUPP; 1897 if (ops->ndo_set_vf_port) 1898 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1899 if (err < 0) 1900 goto errout; 1901 status |= DO_SETLINK_NOTIFY; 1902 } 1903 1904 if (tb[IFLA_AF_SPEC]) { 1905 struct nlattr *af; 1906 int rem; 1907 1908 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1909 const struct rtnl_af_ops *af_ops; 1910 1911 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1912 BUG(); 1913 1914 err = af_ops->set_link_af(dev, af); 1915 if (err < 0) 1916 goto errout; 1917 1918 status |= DO_SETLINK_NOTIFY; 1919 } 1920 } 1921 err = 0; 1922 1923 if (tb[IFLA_PROTO_DOWN]) { 1924 err = dev_change_proto_down(dev, 1925 nla_get_u8(tb[IFLA_PROTO_DOWN])); 1926 if (err) 1927 goto errout; 1928 status |= DO_SETLINK_NOTIFY; 1929 } 1930 1931 errout: 1932 if (status & DO_SETLINK_MODIFIED) { 1933 if (status & DO_SETLINK_NOTIFY) 1934 netdev_state_change(dev); 1935 1936 if (err < 0) 1937 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", 1938 dev->name); 1939 } 1940 1941 return err; 1942 } 1943 1944 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1945 { 1946 struct net *net = sock_net(skb->sk); 1947 struct ifinfomsg *ifm; 1948 struct net_device *dev; 1949 int err; 1950 struct nlattr *tb[IFLA_MAX+1]; 1951 char ifname[IFNAMSIZ]; 1952 1953 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1954 if (err < 0) 1955 goto errout; 1956 1957 if (tb[IFLA_IFNAME]) 1958 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1959 else 1960 ifname[0] = '\0'; 1961 1962 err = -EINVAL; 1963 ifm = nlmsg_data(nlh); 1964 if (ifm->ifi_index > 0) 1965 dev = __dev_get_by_index(net, ifm->ifi_index); 1966 else if (tb[IFLA_IFNAME]) 1967 dev = __dev_get_by_name(net, ifname); 1968 else 1969 goto errout; 1970 1971 if (dev == NULL) { 1972 err = -ENODEV; 1973 goto errout; 1974 } 1975 1976 err = validate_linkmsg(dev, tb); 1977 if (err < 0) 1978 goto errout; 1979 1980 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 1981 errout: 1982 return err; 1983 } 1984 1985 static int rtnl_group_dellink(const struct net *net, int group) 1986 { 1987 struct net_device *dev, *aux; 1988 LIST_HEAD(list_kill); 1989 bool found = false; 1990 1991 if (!group) 1992 return -EPERM; 1993 1994 for_each_netdev(net, dev) { 1995 if (dev->group == group) { 1996 const struct rtnl_link_ops *ops; 1997 1998 found = true; 1999 ops = dev->rtnl_link_ops; 2000 if (!ops || !ops->dellink) 2001 return -EOPNOTSUPP; 2002 } 2003 } 2004 2005 if (!found) 2006 return -ENODEV; 2007 2008 for_each_netdev_safe(net, dev, aux) { 2009 if (dev->group == group) { 2010 const struct rtnl_link_ops *ops; 2011 2012 ops = dev->rtnl_link_ops; 2013 ops->dellink(dev, &list_kill); 2014 } 2015 } 2016 unregister_netdevice_many(&list_kill); 2017 2018 return 0; 2019 } 2020 2021 int rtnl_delete_link(struct net_device *dev) 2022 { 2023 const struct rtnl_link_ops *ops; 2024 LIST_HEAD(list_kill); 2025 2026 ops = dev->rtnl_link_ops; 2027 if (!ops || !ops->dellink) 2028 return -EOPNOTSUPP; 2029 2030 ops->dellink(dev, &list_kill); 2031 unregister_netdevice_many(&list_kill); 2032 2033 return 0; 2034 } 2035 EXPORT_SYMBOL_GPL(rtnl_delete_link); 2036 2037 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2038 { 2039 struct net *net = sock_net(skb->sk); 2040 struct net_device *dev; 2041 struct ifinfomsg *ifm; 2042 char ifname[IFNAMSIZ]; 2043 struct nlattr *tb[IFLA_MAX+1]; 2044 int err; 2045 2046 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2047 if (err < 0) 2048 return err; 2049 2050 if (tb[IFLA_IFNAME]) 2051 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2052 2053 ifm = nlmsg_data(nlh); 2054 if (ifm->ifi_index > 0) 2055 dev = __dev_get_by_index(net, ifm->ifi_index); 2056 else if (tb[IFLA_IFNAME]) 2057 dev = __dev_get_by_name(net, ifname); 2058 else if (tb[IFLA_GROUP]) 2059 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 2060 else 2061 return -EINVAL; 2062 2063 if (!dev) 2064 return -ENODEV; 2065 2066 return rtnl_delete_link(dev); 2067 } 2068 2069 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 2070 { 2071 unsigned int old_flags; 2072 int err; 2073 2074 old_flags = dev->flags; 2075 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2076 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2077 if (err < 0) 2078 return err; 2079 } 2080 2081 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2082 2083 __dev_notify_flags(dev, old_flags, ~0U); 2084 return 0; 2085 } 2086 EXPORT_SYMBOL(rtnl_configure_link); 2087 2088 struct net_device *rtnl_create_link(struct net *net, 2089 const char *ifname, unsigned char name_assign_type, 2090 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2091 { 2092 int err; 2093 struct net_device *dev; 2094 unsigned int num_tx_queues = 1; 2095 unsigned int num_rx_queues = 1; 2096 2097 if (tb[IFLA_NUM_TX_QUEUES]) 2098 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2099 else if (ops->get_num_tx_queues) 2100 num_tx_queues = ops->get_num_tx_queues(); 2101 2102 if (tb[IFLA_NUM_RX_QUEUES]) 2103 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2104 else if (ops->get_num_rx_queues) 2105 num_rx_queues = ops->get_num_rx_queues(); 2106 2107 err = -ENOMEM; 2108 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2109 ops->setup, num_tx_queues, num_rx_queues); 2110 if (!dev) 2111 goto err; 2112 2113 dev_net_set(dev, net); 2114 dev->rtnl_link_ops = ops; 2115 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2116 2117 if (tb[IFLA_MTU]) 2118 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2119 if (tb[IFLA_ADDRESS]) { 2120 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2121 nla_len(tb[IFLA_ADDRESS])); 2122 dev->addr_assign_type = NET_ADDR_SET; 2123 } 2124 if (tb[IFLA_BROADCAST]) 2125 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2126 nla_len(tb[IFLA_BROADCAST])); 2127 if (tb[IFLA_TXQLEN]) 2128 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2129 if (tb[IFLA_OPERSTATE]) 2130 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2131 if (tb[IFLA_LINKMODE]) 2132 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2133 if (tb[IFLA_GROUP]) 2134 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2135 2136 return dev; 2137 2138 err: 2139 return ERR_PTR(err); 2140 } 2141 EXPORT_SYMBOL(rtnl_create_link); 2142 2143 static int rtnl_group_changelink(const struct sk_buff *skb, 2144 struct net *net, int group, 2145 struct ifinfomsg *ifm, 2146 struct nlattr **tb) 2147 { 2148 struct net_device *dev, *aux; 2149 int err; 2150 2151 for_each_netdev_safe(net, dev, aux) { 2152 if (dev->group == group) { 2153 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2154 if (err < 0) 2155 return err; 2156 } 2157 } 2158 2159 return 0; 2160 } 2161 2162 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2163 { 2164 struct net *net = sock_net(skb->sk); 2165 const struct rtnl_link_ops *ops; 2166 const struct rtnl_link_ops *m_ops = NULL; 2167 struct net_device *dev; 2168 struct net_device *master_dev = NULL; 2169 struct ifinfomsg *ifm; 2170 char kind[MODULE_NAME_LEN]; 2171 char ifname[IFNAMSIZ]; 2172 struct nlattr *tb[IFLA_MAX+1]; 2173 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2174 unsigned char name_assign_type = NET_NAME_USER; 2175 int err; 2176 2177 #ifdef CONFIG_MODULES 2178 replay: 2179 #endif 2180 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2181 if (err < 0) 2182 return err; 2183 2184 if (tb[IFLA_IFNAME]) 2185 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2186 else 2187 ifname[0] = '\0'; 2188 2189 ifm = nlmsg_data(nlh); 2190 if (ifm->ifi_index > 0) 2191 dev = __dev_get_by_index(net, ifm->ifi_index); 2192 else { 2193 if (ifname[0]) 2194 dev = __dev_get_by_name(net, ifname); 2195 else 2196 dev = NULL; 2197 } 2198 2199 if (dev) { 2200 master_dev = netdev_master_upper_dev_get(dev); 2201 if (master_dev) 2202 m_ops = master_dev->rtnl_link_ops; 2203 } 2204 2205 err = validate_linkmsg(dev, tb); 2206 if (err < 0) 2207 return err; 2208 2209 if (tb[IFLA_LINKINFO]) { 2210 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2211 tb[IFLA_LINKINFO], ifla_info_policy); 2212 if (err < 0) 2213 return err; 2214 } else 2215 memset(linkinfo, 0, sizeof(linkinfo)); 2216 2217 if (linkinfo[IFLA_INFO_KIND]) { 2218 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2219 ops = rtnl_link_ops_get(kind); 2220 } else { 2221 kind[0] = '\0'; 2222 ops = NULL; 2223 } 2224 2225 if (1) { 2226 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2227 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2228 struct nlattr **data = NULL; 2229 struct nlattr **slave_data = NULL; 2230 struct net *dest_net, *link_net = NULL; 2231 2232 if (ops) { 2233 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2234 err = nla_parse_nested(attr, ops->maxtype, 2235 linkinfo[IFLA_INFO_DATA], 2236 ops->policy); 2237 if (err < 0) 2238 return err; 2239 data = attr; 2240 } 2241 if (ops->validate) { 2242 err = ops->validate(tb, data); 2243 if (err < 0) 2244 return err; 2245 } 2246 } 2247 2248 if (m_ops) { 2249 if (m_ops->slave_maxtype && 2250 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2251 err = nla_parse_nested(slave_attr, 2252 m_ops->slave_maxtype, 2253 linkinfo[IFLA_INFO_SLAVE_DATA], 2254 m_ops->slave_policy); 2255 if (err < 0) 2256 return err; 2257 slave_data = slave_attr; 2258 } 2259 if (m_ops->slave_validate) { 2260 err = m_ops->slave_validate(tb, slave_data); 2261 if (err < 0) 2262 return err; 2263 } 2264 } 2265 2266 if (dev) { 2267 int status = 0; 2268 2269 if (nlh->nlmsg_flags & NLM_F_EXCL) 2270 return -EEXIST; 2271 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2272 return -EOPNOTSUPP; 2273 2274 if (linkinfo[IFLA_INFO_DATA]) { 2275 if (!ops || ops != dev->rtnl_link_ops || 2276 !ops->changelink) 2277 return -EOPNOTSUPP; 2278 2279 err = ops->changelink(dev, tb, data); 2280 if (err < 0) 2281 return err; 2282 status |= DO_SETLINK_NOTIFY; 2283 } 2284 2285 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2286 if (!m_ops || !m_ops->slave_changelink) 2287 return -EOPNOTSUPP; 2288 2289 err = m_ops->slave_changelink(master_dev, dev, 2290 tb, slave_data); 2291 if (err < 0) 2292 return err; 2293 status |= DO_SETLINK_NOTIFY; 2294 } 2295 2296 return do_setlink(skb, dev, ifm, tb, ifname, status); 2297 } 2298 2299 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2300 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2301 return rtnl_group_changelink(skb, net, 2302 nla_get_u32(tb[IFLA_GROUP]), 2303 ifm, tb); 2304 return -ENODEV; 2305 } 2306 2307 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2308 return -EOPNOTSUPP; 2309 2310 if (!ops) { 2311 #ifdef CONFIG_MODULES 2312 if (kind[0]) { 2313 __rtnl_unlock(); 2314 request_module("rtnl-link-%s", kind); 2315 rtnl_lock(); 2316 ops = rtnl_link_ops_get(kind); 2317 if (ops) 2318 goto replay; 2319 } 2320 #endif 2321 return -EOPNOTSUPP; 2322 } 2323 2324 if (!ops->setup) 2325 return -EOPNOTSUPP; 2326 2327 if (!ifname[0]) { 2328 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2329 name_assign_type = NET_NAME_ENUM; 2330 } 2331 2332 dest_net = rtnl_link_get_net(net, tb); 2333 if (IS_ERR(dest_net)) 2334 return PTR_ERR(dest_net); 2335 2336 err = -EPERM; 2337 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2338 goto out; 2339 2340 if (tb[IFLA_LINK_NETNSID]) { 2341 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2342 2343 link_net = get_net_ns_by_id(dest_net, id); 2344 if (!link_net) { 2345 err = -EINVAL; 2346 goto out; 2347 } 2348 err = -EPERM; 2349 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2350 goto out; 2351 } 2352 2353 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2354 name_assign_type, ops, tb); 2355 if (IS_ERR(dev)) { 2356 err = PTR_ERR(dev); 2357 goto out; 2358 } 2359 2360 dev->ifindex = ifm->ifi_index; 2361 2362 if (ops->newlink) { 2363 err = ops->newlink(link_net ? : net, dev, tb, data); 2364 /* Drivers should call free_netdev() in ->destructor 2365 * and unregister it on failure after registration 2366 * so that device could be finally freed in rtnl_unlock. 2367 */ 2368 if (err < 0) { 2369 /* If device is not registered at all, free it now */ 2370 if (dev->reg_state == NETREG_UNINITIALIZED) 2371 free_netdev(dev); 2372 goto out; 2373 } 2374 } else { 2375 err = register_netdevice(dev); 2376 if (err < 0) { 2377 free_netdev(dev); 2378 goto out; 2379 } 2380 } 2381 err = rtnl_configure_link(dev, ifm); 2382 if (err < 0) 2383 goto out_unregister; 2384 if (link_net) { 2385 err = dev_change_net_namespace(dev, dest_net, ifname); 2386 if (err < 0) 2387 goto out_unregister; 2388 } 2389 out: 2390 if (link_net) 2391 put_net(link_net); 2392 put_net(dest_net); 2393 return err; 2394 out_unregister: 2395 if (ops->newlink) { 2396 LIST_HEAD(list_kill); 2397 2398 ops->dellink(dev, &list_kill); 2399 unregister_netdevice_many(&list_kill); 2400 } else { 2401 unregister_netdevice(dev); 2402 } 2403 goto out; 2404 } 2405 } 2406 2407 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2408 { 2409 struct net *net = sock_net(skb->sk); 2410 struct ifinfomsg *ifm; 2411 char ifname[IFNAMSIZ]; 2412 struct nlattr *tb[IFLA_MAX+1]; 2413 struct net_device *dev = NULL; 2414 struct sk_buff *nskb; 2415 int err; 2416 u32 ext_filter_mask = 0; 2417 2418 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2419 if (err < 0) 2420 return err; 2421 2422 if (tb[IFLA_IFNAME]) 2423 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2424 2425 if (tb[IFLA_EXT_MASK]) 2426 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2427 2428 ifm = nlmsg_data(nlh); 2429 if (ifm->ifi_index > 0) 2430 dev = __dev_get_by_index(net, ifm->ifi_index); 2431 else if (tb[IFLA_IFNAME]) 2432 dev = __dev_get_by_name(net, ifname); 2433 else 2434 return -EINVAL; 2435 2436 if (dev == NULL) 2437 return -ENODEV; 2438 2439 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2440 if (nskb == NULL) 2441 return -ENOBUFS; 2442 2443 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2444 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2445 if (err < 0) { 2446 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2447 WARN_ON(err == -EMSGSIZE); 2448 kfree_skb(nskb); 2449 } else 2450 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2451 2452 return err; 2453 } 2454 2455 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2456 { 2457 struct net *net = sock_net(skb->sk); 2458 struct net_device *dev; 2459 struct nlattr *tb[IFLA_MAX+1]; 2460 u32 ext_filter_mask = 0; 2461 u16 min_ifinfo_dump_size = 0; 2462 int hdrlen; 2463 2464 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2465 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2466 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2467 2468 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2469 if (tb[IFLA_EXT_MASK]) 2470 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2471 } 2472 2473 if (!ext_filter_mask) 2474 return NLMSG_GOODSIZE; 2475 /* 2476 * traverse the list of net devices and compute the minimum 2477 * buffer size based upon the filter mask. 2478 */ 2479 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2480 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2481 if_nlmsg_size(dev, 2482 ext_filter_mask)); 2483 } 2484 2485 return min_ifinfo_dump_size; 2486 } 2487 2488 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2489 { 2490 int idx; 2491 int s_idx = cb->family; 2492 2493 if (s_idx == 0) 2494 s_idx = 1; 2495 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2496 int type = cb->nlh->nlmsg_type-RTM_BASE; 2497 if (idx < s_idx || idx == PF_PACKET) 2498 continue; 2499 if (rtnl_msg_handlers[idx] == NULL || 2500 rtnl_msg_handlers[idx][type].dumpit == NULL) 2501 continue; 2502 if (idx > s_idx) { 2503 memset(&cb->args[0], 0, sizeof(cb->args)); 2504 cb->prev_seq = 0; 2505 cb->seq = 0; 2506 } 2507 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2508 break; 2509 } 2510 cb->family = idx; 2511 2512 return skb->len; 2513 } 2514 2515 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2516 unsigned int change, gfp_t flags) 2517 { 2518 struct net *net = dev_net(dev); 2519 struct sk_buff *skb; 2520 int err = -ENOBUFS; 2521 size_t if_info_size; 2522 2523 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2524 if (skb == NULL) 2525 goto errout; 2526 2527 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2528 if (err < 0) { 2529 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2530 WARN_ON(err == -EMSGSIZE); 2531 kfree_skb(skb); 2532 goto errout; 2533 } 2534 return skb; 2535 errout: 2536 if (err < 0) 2537 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2538 return NULL; 2539 } 2540 2541 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2542 { 2543 struct net *net = dev_net(dev); 2544 2545 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2546 } 2547 2548 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2549 gfp_t flags) 2550 { 2551 struct sk_buff *skb; 2552 2553 if (dev->reg_state != NETREG_REGISTERED) 2554 return; 2555 2556 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2557 if (skb) 2558 rtmsg_ifinfo_send(skb, dev, flags); 2559 } 2560 EXPORT_SYMBOL(rtmsg_ifinfo); 2561 2562 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2563 struct net_device *dev, 2564 u8 *addr, u16 vid, u32 pid, u32 seq, 2565 int type, unsigned int flags, 2566 int nlflags) 2567 { 2568 struct nlmsghdr *nlh; 2569 struct ndmsg *ndm; 2570 2571 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2572 if (!nlh) 2573 return -EMSGSIZE; 2574 2575 ndm = nlmsg_data(nlh); 2576 ndm->ndm_family = AF_BRIDGE; 2577 ndm->ndm_pad1 = 0; 2578 ndm->ndm_pad2 = 0; 2579 ndm->ndm_flags = flags; 2580 ndm->ndm_type = 0; 2581 ndm->ndm_ifindex = dev->ifindex; 2582 ndm->ndm_state = NUD_PERMANENT; 2583 2584 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2585 goto nla_put_failure; 2586 if (vid) 2587 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2588 goto nla_put_failure; 2589 2590 nlmsg_end(skb, nlh); 2591 return 0; 2592 2593 nla_put_failure: 2594 nlmsg_cancel(skb, nlh); 2595 return -EMSGSIZE; 2596 } 2597 2598 static inline size_t rtnl_fdb_nlmsg_size(void) 2599 { 2600 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2601 } 2602 2603 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type) 2604 { 2605 struct net *net = dev_net(dev); 2606 struct sk_buff *skb; 2607 int err = -ENOBUFS; 2608 2609 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2610 if (!skb) 2611 goto errout; 2612 2613 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2614 0, 0, type, NTF_SELF, 0); 2615 if (err < 0) { 2616 kfree_skb(skb); 2617 goto errout; 2618 } 2619 2620 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2621 return; 2622 errout: 2623 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2624 } 2625 2626 /** 2627 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2628 */ 2629 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2630 struct nlattr *tb[], 2631 struct net_device *dev, 2632 const unsigned char *addr, u16 vid, 2633 u16 flags) 2634 { 2635 int err = -EINVAL; 2636 2637 /* If aging addresses are supported device will need to 2638 * implement its own handler for this. 2639 */ 2640 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2641 pr_info("%s: FDB only supports static addresses\n", dev->name); 2642 return err; 2643 } 2644 2645 if (vid) { 2646 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2647 return err; 2648 } 2649 2650 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2651 err = dev_uc_add_excl(dev, addr); 2652 else if (is_multicast_ether_addr(addr)) 2653 err = dev_mc_add_excl(dev, addr); 2654 2655 /* Only return duplicate errors if NLM_F_EXCL is set */ 2656 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2657 err = 0; 2658 2659 return err; 2660 } 2661 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2662 2663 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2664 { 2665 u16 vid = 0; 2666 2667 if (vlan_attr) { 2668 if (nla_len(vlan_attr) != sizeof(u16)) { 2669 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2670 return -EINVAL; 2671 } 2672 2673 vid = nla_get_u16(vlan_attr); 2674 2675 if (!vid || vid >= VLAN_VID_MASK) { 2676 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2677 vid); 2678 return -EINVAL; 2679 } 2680 } 2681 *p_vid = vid; 2682 return 0; 2683 } 2684 2685 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2686 { 2687 struct net *net = sock_net(skb->sk); 2688 struct ndmsg *ndm; 2689 struct nlattr *tb[NDA_MAX+1]; 2690 struct net_device *dev; 2691 u8 *addr; 2692 u16 vid; 2693 int err; 2694 2695 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2696 if (err < 0) 2697 return err; 2698 2699 ndm = nlmsg_data(nlh); 2700 if (ndm->ndm_ifindex == 0) { 2701 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2702 return -EINVAL; 2703 } 2704 2705 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2706 if (dev == NULL) { 2707 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2708 return -ENODEV; 2709 } 2710 2711 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2712 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2713 return -EINVAL; 2714 } 2715 2716 addr = nla_data(tb[NDA_LLADDR]); 2717 2718 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2719 if (err) 2720 return err; 2721 2722 err = -EOPNOTSUPP; 2723 2724 /* Support fdb on master device the net/bridge default case */ 2725 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2726 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2727 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2728 const struct net_device_ops *ops = br_dev->netdev_ops; 2729 2730 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2731 nlh->nlmsg_flags); 2732 if (err) 2733 goto out; 2734 else 2735 ndm->ndm_flags &= ~NTF_MASTER; 2736 } 2737 2738 /* Embedded bridge, macvlan, and any other device support */ 2739 if ((ndm->ndm_flags & NTF_SELF)) { 2740 if (dev->netdev_ops->ndo_fdb_add) 2741 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2742 vid, 2743 nlh->nlmsg_flags); 2744 else 2745 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 2746 nlh->nlmsg_flags); 2747 2748 if (!err) { 2749 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH); 2750 ndm->ndm_flags &= ~NTF_SELF; 2751 } 2752 } 2753 out: 2754 return err; 2755 } 2756 2757 /** 2758 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2759 */ 2760 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2761 struct nlattr *tb[], 2762 struct net_device *dev, 2763 const unsigned char *addr, u16 vid) 2764 { 2765 int err = -EINVAL; 2766 2767 /* If aging addresses are supported device will need to 2768 * implement its own handler for this. 2769 */ 2770 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2771 pr_info("%s: FDB only supports static addresses\n", dev->name); 2772 return err; 2773 } 2774 2775 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2776 err = dev_uc_del(dev, addr); 2777 else if (is_multicast_ether_addr(addr)) 2778 err = dev_mc_del(dev, addr); 2779 2780 return err; 2781 } 2782 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2783 2784 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2785 { 2786 struct net *net = sock_net(skb->sk); 2787 struct ndmsg *ndm; 2788 struct nlattr *tb[NDA_MAX+1]; 2789 struct net_device *dev; 2790 int err = -EINVAL; 2791 __u8 *addr; 2792 u16 vid; 2793 2794 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2795 return -EPERM; 2796 2797 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2798 if (err < 0) 2799 return err; 2800 2801 ndm = nlmsg_data(nlh); 2802 if (ndm->ndm_ifindex == 0) { 2803 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2804 return -EINVAL; 2805 } 2806 2807 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2808 if (dev == NULL) { 2809 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2810 return -ENODEV; 2811 } 2812 2813 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2814 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2815 return -EINVAL; 2816 } 2817 2818 addr = nla_data(tb[NDA_LLADDR]); 2819 2820 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2821 if (err) 2822 return err; 2823 2824 err = -EOPNOTSUPP; 2825 2826 /* Support fdb on master device the net/bridge default case */ 2827 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2828 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2829 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2830 const struct net_device_ops *ops = br_dev->netdev_ops; 2831 2832 if (ops->ndo_fdb_del) 2833 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 2834 2835 if (err) 2836 goto out; 2837 else 2838 ndm->ndm_flags &= ~NTF_MASTER; 2839 } 2840 2841 /* Embedded bridge, macvlan, and any other device support */ 2842 if (ndm->ndm_flags & NTF_SELF) { 2843 if (dev->netdev_ops->ndo_fdb_del) 2844 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 2845 vid); 2846 else 2847 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 2848 2849 if (!err) { 2850 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH); 2851 ndm->ndm_flags &= ~NTF_SELF; 2852 } 2853 } 2854 out: 2855 return err; 2856 } 2857 2858 static int nlmsg_populate_fdb(struct sk_buff *skb, 2859 struct netlink_callback *cb, 2860 struct net_device *dev, 2861 int *idx, 2862 struct netdev_hw_addr_list *list) 2863 { 2864 struct netdev_hw_addr *ha; 2865 int err; 2866 u32 portid, seq; 2867 2868 portid = NETLINK_CB(cb->skb).portid; 2869 seq = cb->nlh->nlmsg_seq; 2870 2871 list_for_each_entry(ha, &list->list, list) { 2872 if (*idx < cb->args[0]) 2873 goto skip; 2874 2875 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 2876 portid, seq, 2877 RTM_NEWNEIGH, NTF_SELF, 2878 NLM_F_MULTI); 2879 if (err < 0) 2880 return err; 2881 skip: 2882 *idx += 1; 2883 } 2884 return 0; 2885 } 2886 2887 /** 2888 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2889 * @nlh: netlink message header 2890 * @dev: netdevice 2891 * 2892 * Default netdevice operation to dump the existing unicast address list. 2893 * Returns number of addresses from list put in skb. 2894 */ 2895 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2896 struct netlink_callback *cb, 2897 struct net_device *dev, 2898 struct net_device *filter_dev, 2899 int idx) 2900 { 2901 int err; 2902 2903 netif_addr_lock_bh(dev); 2904 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2905 if (err) 2906 goto out; 2907 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2908 out: 2909 netif_addr_unlock_bh(dev); 2910 return idx; 2911 } 2912 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2913 2914 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2915 { 2916 struct net_device *dev; 2917 struct nlattr *tb[IFLA_MAX+1]; 2918 struct net_device *br_dev = NULL; 2919 const struct net_device_ops *ops = NULL; 2920 const struct net_device_ops *cops = NULL; 2921 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2922 struct net *net = sock_net(skb->sk); 2923 int brport_idx = 0; 2924 int br_idx = 0; 2925 int idx = 0; 2926 2927 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 2928 ifla_policy) == 0) { 2929 if (tb[IFLA_MASTER]) 2930 br_idx = nla_get_u32(tb[IFLA_MASTER]); 2931 } 2932 2933 brport_idx = ifm->ifi_index; 2934 2935 if (br_idx) { 2936 br_dev = __dev_get_by_index(net, br_idx); 2937 if (!br_dev) 2938 return -ENODEV; 2939 2940 ops = br_dev->netdev_ops; 2941 } 2942 2943 for_each_netdev(net, dev) { 2944 if (brport_idx && (dev->ifindex != brport_idx)) 2945 continue; 2946 2947 if (!br_idx) { /* user did not specify a specific bridge */ 2948 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2949 br_dev = netdev_master_upper_dev_get(dev); 2950 cops = br_dev->netdev_ops; 2951 } 2952 2953 } else { 2954 if (dev != br_dev && 2955 !(dev->priv_flags & IFF_BRIDGE_PORT)) 2956 continue; 2957 2958 if (br_dev != netdev_master_upper_dev_get(dev) && 2959 !(dev->priv_flags & IFF_EBRIDGE)) 2960 continue; 2961 2962 cops = ops; 2963 } 2964 2965 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2966 if (cops && cops->ndo_fdb_dump) 2967 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 2968 idx); 2969 } 2970 2971 if (dev->netdev_ops->ndo_fdb_dump) 2972 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL, 2973 idx); 2974 else 2975 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 2976 2977 cops = NULL; 2978 } 2979 2980 cb->args[0] = idx; 2981 return skb->len; 2982 } 2983 2984 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 2985 unsigned int attrnum, unsigned int flag) 2986 { 2987 if (mask & flag) 2988 return nla_put_u8(skb, attrnum, !!(flags & flag)); 2989 return 0; 2990 } 2991 2992 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2993 struct net_device *dev, u16 mode, 2994 u32 flags, u32 mask, int nlflags, 2995 u32 filter_mask, 2996 int (*vlan_fill)(struct sk_buff *skb, 2997 struct net_device *dev, 2998 u32 filter_mask)) 2999 { 3000 struct nlmsghdr *nlh; 3001 struct ifinfomsg *ifm; 3002 struct nlattr *br_afspec; 3003 struct nlattr *protinfo; 3004 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 3005 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3006 int err = 0; 3007 3008 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 3009 if (nlh == NULL) 3010 return -EMSGSIZE; 3011 3012 ifm = nlmsg_data(nlh); 3013 ifm->ifi_family = AF_BRIDGE; 3014 ifm->__ifi_pad = 0; 3015 ifm->ifi_type = dev->type; 3016 ifm->ifi_index = dev->ifindex; 3017 ifm->ifi_flags = dev_get_flags(dev); 3018 ifm->ifi_change = 0; 3019 3020 3021 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 3022 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 3023 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 3024 (br_dev && 3025 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 3026 (dev->addr_len && 3027 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 3028 (dev->ifindex != dev_get_iflink(dev) && 3029 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 3030 goto nla_put_failure; 3031 3032 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 3033 if (!br_afspec) 3034 goto nla_put_failure; 3035 3036 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 3037 nla_nest_cancel(skb, br_afspec); 3038 goto nla_put_failure; 3039 } 3040 3041 if (mode != BRIDGE_MODE_UNDEF) { 3042 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 3043 nla_nest_cancel(skb, br_afspec); 3044 goto nla_put_failure; 3045 } 3046 } 3047 if (vlan_fill) { 3048 err = vlan_fill(skb, dev, filter_mask); 3049 if (err) { 3050 nla_nest_cancel(skb, br_afspec); 3051 goto nla_put_failure; 3052 } 3053 } 3054 nla_nest_end(skb, br_afspec); 3055 3056 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 3057 if (!protinfo) 3058 goto nla_put_failure; 3059 3060 if (brport_nla_put_flag(skb, flags, mask, 3061 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 3062 brport_nla_put_flag(skb, flags, mask, 3063 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 3064 brport_nla_put_flag(skb, flags, mask, 3065 IFLA_BRPORT_FAST_LEAVE, 3066 BR_MULTICAST_FAST_LEAVE) || 3067 brport_nla_put_flag(skb, flags, mask, 3068 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 3069 brport_nla_put_flag(skb, flags, mask, 3070 IFLA_BRPORT_LEARNING, BR_LEARNING) || 3071 brport_nla_put_flag(skb, flags, mask, 3072 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 3073 brport_nla_put_flag(skb, flags, mask, 3074 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3075 brport_nla_put_flag(skb, flags, mask, 3076 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3077 nla_nest_cancel(skb, protinfo); 3078 goto nla_put_failure; 3079 } 3080 3081 nla_nest_end(skb, protinfo); 3082 3083 nlmsg_end(skb, nlh); 3084 return 0; 3085 nla_put_failure: 3086 nlmsg_cancel(skb, nlh); 3087 return err ? err : -EMSGSIZE; 3088 } 3089 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3090 3091 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3092 { 3093 struct net *net = sock_net(skb->sk); 3094 struct net_device *dev; 3095 int idx = 0; 3096 u32 portid = NETLINK_CB(cb->skb).portid; 3097 u32 seq = cb->nlh->nlmsg_seq; 3098 u32 filter_mask = 0; 3099 int err; 3100 3101 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3102 struct nlattr *extfilt; 3103 3104 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3105 IFLA_EXT_MASK); 3106 if (extfilt) { 3107 if (nla_len(extfilt) < sizeof(filter_mask)) 3108 return -EINVAL; 3109 3110 filter_mask = nla_get_u32(extfilt); 3111 } 3112 } 3113 3114 rcu_read_lock(); 3115 for_each_netdev_rcu(net, dev) { 3116 const struct net_device_ops *ops = dev->netdev_ops; 3117 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3118 3119 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3120 if (idx >= cb->args[0]) { 3121 err = br_dev->netdev_ops->ndo_bridge_getlink( 3122 skb, portid, seq, dev, 3123 filter_mask, NLM_F_MULTI); 3124 if (err < 0 && err != -EOPNOTSUPP) 3125 break; 3126 } 3127 idx++; 3128 } 3129 3130 if (ops->ndo_bridge_getlink) { 3131 if (idx >= cb->args[0]) { 3132 err = ops->ndo_bridge_getlink(skb, portid, 3133 seq, dev, 3134 filter_mask, 3135 NLM_F_MULTI); 3136 if (err < 0 && err != -EOPNOTSUPP) 3137 break; 3138 } 3139 idx++; 3140 } 3141 } 3142 rcu_read_unlock(); 3143 cb->args[0] = idx; 3144 3145 return skb->len; 3146 } 3147 3148 static inline size_t bridge_nlmsg_size(void) 3149 { 3150 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3151 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3152 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3153 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3154 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3155 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3156 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3157 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3158 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3159 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3160 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3161 } 3162 3163 static int rtnl_bridge_notify(struct net_device *dev) 3164 { 3165 struct net *net = dev_net(dev); 3166 struct sk_buff *skb; 3167 int err = -EOPNOTSUPP; 3168 3169 if (!dev->netdev_ops->ndo_bridge_getlink) 3170 return 0; 3171 3172 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3173 if (!skb) { 3174 err = -ENOMEM; 3175 goto errout; 3176 } 3177 3178 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3179 if (err < 0) 3180 goto errout; 3181 3182 if (!skb->len) 3183 goto errout; 3184 3185 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3186 return 0; 3187 errout: 3188 WARN_ON(err == -EMSGSIZE); 3189 kfree_skb(skb); 3190 if (err) 3191 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3192 return err; 3193 } 3194 3195 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3196 { 3197 struct net *net = sock_net(skb->sk); 3198 struct ifinfomsg *ifm; 3199 struct net_device *dev; 3200 struct nlattr *br_spec, *attr = NULL; 3201 int rem, err = -EOPNOTSUPP; 3202 u16 flags = 0; 3203 bool have_flags = false; 3204 3205 if (nlmsg_len(nlh) < sizeof(*ifm)) 3206 return -EINVAL; 3207 3208 ifm = nlmsg_data(nlh); 3209 if (ifm->ifi_family != AF_BRIDGE) 3210 return -EPFNOSUPPORT; 3211 3212 dev = __dev_get_by_index(net, ifm->ifi_index); 3213 if (!dev) { 3214 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3215 return -ENODEV; 3216 } 3217 3218 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3219 if (br_spec) { 3220 nla_for_each_nested(attr, br_spec, rem) { 3221 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3222 if (nla_len(attr) < sizeof(flags)) 3223 return -EINVAL; 3224 3225 have_flags = true; 3226 flags = nla_get_u16(attr); 3227 break; 3228 } 3229 } 3230 } 3231 3232 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3233 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3234 3235 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3236 err = -EOPNOTSUPP; 3237 goto out; 3238 } 3239 3240 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3241 if (err) 3242 goto out; 3243 3244 flags &= ~BRIDGE_FLAGS_MASTER; 3245 } 3246 3247 if ((flags & BRIDGE_FLAGS_SELF)) { 3248 if (!dev->netdev_ops->ndo_bridge_setlink) 3249 err = -EOPNOTSUPP; 3250 else 3251 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3252 flags); 3253 if (!err) { 3254 flags &= ~BRIDGE_FLAGS_SELF; 3255 3256 /* Generate event to notify upper layer of bridge 3257 * change 3258 */ 3259 err = rtnl_bridge_notify(dev); 3260 } 3261 } 3262 3263 if (have_flags) 3264 memcpy(nla_data(attr), &flags, sizeof(flags)); 3265 out: 3266 return err; 3267 } 3268 3269 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3270 { 3271 struct net *net = sock_net(skb->sk); 3272 struct ifinfomsg *ifm; 3273 struct net_device *dev; 3274 struct nlattr *br_spec, *attr = NULL; 3275 int rem, err = -EOPNOTSUPP; 3276 u16 flags = 0; 3277 bool have_flags = false; 3278 3279 if (nlmsg_len(nlh) < sizeof(*ifm)) 3280 return -EINVAL; 3281 3282 ifm = nlmsg_data(nlh); 3283 if (ifm->ifi_family != AF_BRIDGE) 3284 return -EPFNOSUPPORT; 3285 3286 dev = __dev_get_by_index(net, ifm->ifi_index); 3287 if (!dev) { 3288 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3289 return -ENODEV; 3290 } 3291 3292 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3293 if (br_spec) { 3294 nla_for_each_nested(attr, br_spec, rem) { 3295 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3296 if (nla_len(attr) < sizeof(flags)) 3297 return -EINVAL; 3298 3299 have_flags = true; 3300 flags = nla_get_u16(attr); 3301 break; 3302 } 3303 } 3304 } 3305 3306 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3307 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3308 3309 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3310 err = -EOPNOTSUPP; 3311 goto out; 3312 } 3313 3314 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3315 if (err) 3316 goto out; 3317 3318 flags &= ~BRIDGE_FLAGS_MASTER; 3319 } 3320 3321 if ((flags & BRIDGE_FLAGS_SELF)) { 3322 if (!dev->netdev_ops->ndo_bridge_dellink) 3323 err = -EOPNOTSUPP; 3324 else 3325 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3326 flags); 3327 3328 if (!err) { 3329 flags &= ~BRIDGE_FLAGS_SELF; 3330 3331 /* Generate event to notify upper layer of bridge 3332 * change 3333 */ 3334 err = rtnl_bridge_notify(dev); 3335 } 3336 } 3337 3338 if (have_flags) 3339 memcpy(nla_data(attr), &flags, sizeof(flags)); 3340 out: 3341 return err; 3342 } 3343 3344 /* Process one rtnetlink message. */ 3345 3346 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3347 { 3348 struct net *net = sock_net(skb->sk); 3349 rtnl_doit_func doit; 3350 int sz_idx, kind; 3351 int family; 3352 int type; 3353 int err; 3354 3355 type = nlh->nlmsg_type; 3356 if (type > RTM_MAX) 3357 return -EOPNOTSUPP; 3358 3359 type -= RTM_BASE; 3360 3361 /* All the messages must have at least 1 byte length */ 3362 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3363 return 0; 3364 3365 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3366 sz_idx = type>>2; 3367 kind = type&3; 3368 3369 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3370 return -EPERM; 3371 3372 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 3373 struct sock *rtnl; 3374 rtnl_dumpit_func dumpit; 3375 rtnl_calcit_func calcit; 3376 u16 min_dump_alloc = 0; 3377 3378 dumpit = rtnl_get_dumpit(family, type); 3379 if (dumpit == NULL) 3380 return -EOPNOTSUPP; 3381 calcit = rtnl_get_calcit(family, type); 3382 if (calcit) 3383 min_dump_alloc = calcit(skb, nlh); 3384 3385 __rtnl_unlock(); 3386 rtnl = net->rtnl; 3387 { 3388 struct netlink_dump_control c = { 3389 .dump = dumpit, 3390 .min_dump_alloc = min_dump_alloc, 3391 }; 3392 err = netlink_dump_start(rtnl, skb, nlh, &c); 3393 } 3394 rtnl_lock(); 3395 return err; 3396 } 3397 3398 doit = rtnl_get_doit(family, type); 3399 if (doit == NULL) 3400 return -EOPNOTSUPP; 3401 3402 return doit(skb, nlh); 3403 } 3404 3405 static void rtnetlink_rcv(struct sk_buff *skb) 3406 { 3407 rtnl_lock(); 3408 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 3409 rtnl_unlock(); 3410 } 3411 3412 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 3413 { 3414 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3415 3416 switch (event) { 3417 case NETDEV_UP: 3418 case NETDEV_DOWN: 3419 case NETDEV_PRE_UP: 3420 case NETDEV_POST_INIT: 3421 case NETDEV_REGISTER: 3422 case NETDEV_CHANGE: 3423 case NETDEV_PRE_TYPE_CHANGE: 3424 case NETDEV_GOING_DOWN: 3425 case NETDEV_UNREGISTER: 3426 case NETDEV_UNREGISTER_FINAL: 3427 case NETDEV_RELEASE: 3428 case NETDEV_JOIN: 3429 case NETDEV_BONDING_INFO: 3430 break; 3431 default: 3432 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3433 break; 3434 } 3435 return NOTIFY_DONE; 3436 } 3437 3438 static struct notifier_block rtnetlink_dev_notifier = { 3439 .notifier_call = rtnetlink_event, 3440 }; 3441 3442 3443 static int __net_init rtnetlink_net_init(struct net *net) 3444 { 3445 struct sock *sk; 3446 struct netlink_kernel_cfg cfg = { 3447 .groups = RTNLGRP_MAX, 3448 .input = rtnetlink_rcv, 3449 .cb_mutex = &rtnl_mutex, 3450 .flags = NL_CFG_F_NONROOT_RECV, 3451 }; 3452 3453 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3454 if (!sk) 3455 return -ENOMEM; 3456 net->rtnl = sk; 3457 return 0; 3458 } 3459 3460 static void __net_exit rtnetlink_net_exit(struct net *net) 3461 { 3462 netlink_kernel_release(net->rtnl); 3463 net->rtnl = NULL; 3464 } 3465 3466 static struct pernet_operations rtnetlink_net_ops = { 3467 .init = rtnetlink_net_init, 3468 .exit = rtnetlink_net_exit, 3469 }; 3470 3471 void __init rtnetlink_init(void) 3472 { 3473 if (register_pernet_subsys(&rtnetlink_net_ops)) 3474 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3475 3476 register_netdevice_notifier(&rtnetlink_dev_notifier); 3477 3478 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3479 rtnl_dump_ifinfo, rtnl_calcit); 3480 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3481 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3482 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3483 3484 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3485 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3486 3487 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3488 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3489 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3490 3491 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3492 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3493 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3494 } 3495