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, <[email protected]> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/slab.h> 31 #include <linux/interrupt.h> 32 #include <linux/capability.h> 33 #include <linux/skbuff.h> 34 #include <linux/init.h> 35 #include <linux/security.h> 36 #include <linux/mutex.h> 37 #include <linux/if_addr.h> 38 #include <linux/if_bridge.h> 39 #include <linux/if_vlan.h> 40 #include <linux/pci.h> 41 #include <linux/etherdevice.h> 42 43 #include <asm/uaccess.h> 44 45 #include <linux/inet.h> 46 #include <linux/netdevice.h> 47 #include <net/switchdev.h> 48 #include <net/ip.h> 49 #include <net/protocol.h> 50 #include <net/arp.h> 51 #include <net/route.h> 52 #include <net/udp.h> 53 #include <net/tcp.h> 54 #include <net/sock.h> 55 #include <net/pkt_sched.h> 56 #include <net/fib_rules.h> 57 #include <net/rtnetlink.h> 58 #include <net/net_namespace.h> 59 60 struct rtnl_link { 61 rtnl_doit_func doit; 62 rtnl_dumpit_func dumpit; 63 rtnl_calcit_func calcit; 64 }; 65 66 static DEFINE_MUTEX(rtnl_mutex); 67 68 void rtnl_lock(void) 69 { 70 mutex_lock(&rtnl_mutex); 71 } 72 EXPORT_SYMBOL(rtnl_lock); 73 74 void __rtnl_unlock(void) 75 { 76 mutex_unlock(&rtnl_mutex); 77 } 78 79 void rtnl_unlock(void) 80 { 81 /* This fellow will unlock it for us. */ 82 netdev_run_todo(); 83 } 84 EXPORT_SYMBOL(rtnl_unlock); 85 86 int rtnl_trylock(void) 87 { 88 return mutex_trylock(&rtnl_mutex); 89 } 90 EXPORT_SYMBOL(rtnl_trylock); 91 92 int rtnl_is_locked(void) 93 { 94 return mutex_is_locked(&rtnl_mutex); 95 } 96 EXPORT_SYMBOL(rtnl_is_locked); 97 98 #ifdef CONFIG_PROVE_LOCKING 99 bool lockdep_rtnl_is_held(void) 100 { 101 return lockdep_is_held(&rtnl_mutex); 102 } 103 EXPORT_SYMBOL(lockdep_rtnl_is_held); 104 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 105 106 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 107 108 static inline int rtm_msgindex(int msgtype) 109 { 110 int msgindex = msgtype - RTM_BASE; 111 112 /* 113 * msgindex < 0 implies someone tried to register a netlink 114 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 115 * the message type has not been added to linux/rtnetlink.h 116 */ 117 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 118 119 return msgindex; 120 } 121 122 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 123 { 124 struct rtnl_link *tab; 125 126 if (protocol <= RTNL_FAMILY_MAX) 127 tab = rtnl_msg_handlers[protocol]; 128 else 129 tab = NULL; 130 131 if (tab == NULL || tab[msgindex].doit == NULL) 132 tab = rtnl_msg_handlers[PF_UNSPEC]; 133 134 return tab[msgindex].doit; 135 } 136 137 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 138 { 139 struct rtnl_link *tab; 140 141 if (protocol <= RTNL_FAMILY_MAX) 142 tab = rtnl_msg_handlers[protocol]; 143 else 144 tab = NULL; 145 146 if (tab == NULL || tab[msgindex].dumpit == NULL) 147 tab = rtnl_msg_handlers[PF_UNSPEC]; 148 149 return tab[msgindex].dumpit; 150 } 151 152 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 153 { 154 struct rtnl_link *tab; 155 156 if (protocol <= RTNL_FAMILY_MAX) 157 tab = rtnl_msg_handlers[protocol]; 158 else 159 tab = NULL; 160 161 if (tab == NULL || tab[msgindex].calcit == NULL) 162 tab = rtnl_msg_handlers[PF_UNSPEC]; 163 164 return tab[msgindex].calcit; 165 } 166 167 /** 168 * __rtnl_register - Register a rtnetlink message type 169 * @protocol: Protocol family or PF_UNSPEC 170 * @msgtype: rtnetlink message type 171 * @doit: Function pointer called for each request message 172 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 173 * @calcit: Function pointer to calc size of dump message 174 * 175 * Registers the specified function pointers (at least one of them has 176 * to be non-NULL) to be called whenever a request message for the 177 * specified protocol family and message type is received. 178 * 179 * The special protocol family PF_UNSPEC may be used to define fallback 180 * function pointers for the case when no entry for the specific protocol 181 * family exists. 182 * 183 * Returns 0 on success or a negative error code. 184 */ 185 int __rtnl_register(int protocol, int msgtype, 186 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 187 rtnl_calcit_func calcit) 188 { 189 struct rtnl_link *tab; 190 int msgindex; 191 192 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 193 msgindex = rtm_msgindex(msgtype); 194 195 tab = rtnl_msg_handlers[protocol]; 196 if (tab == NULL) { 197 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 198 if (tab == NULL) 199 return -ENOBUFS; 200 201 rtnl_msg_handlers[protocol] = tab; 202 } 203 204 if (doit) 205 tab[msgindex].doit = doit; 206 207 if (dumpit) 208 tab[msgindex].dumpit = dumpit; 209 210 if (calcit) 211 tab[msgindex].calcit = calcit; 212 213 return 0; 214 } 215 EXPORT_SYMBOL_GPL(__rtnl_register); 216 217 /** 218 * rtnl_register - Register a rtnetlink message type 219 * 220 * Identical to __rtnl_register() but panics on failure. This is useful 221 * as failure of this function is very unlikely, it can only happen due 222 * to lack of memory when allocating the chain to store all message 223 * handlers for a protocol. Meant for use in init functions where lack 224 * of memory implies no sense in continuing. 225 */ 226 void rtnl_register(int protocol, int msgtype, 227 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 228 rtnl_calcit_func calcit) 229 { 230 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 231 panic("Unable to register rtnetlink message handler, " 232 "protocol = %d, message type = %d\n", 233 protocol, msgtype); 234 } 235 EXPORT_SYMBOL_GPL(rtnl_register); 236 237 /** 238 * rtnl_unregister - Unregister a rtnetlink message type 239 * @protocol: Protocol family or PF_UNSPEC 240 * @msgtype: rtnetlink message type 241 * 242 * Returns 0 on success or a negative error code. 243 */ 244 int rtnl_unregister(int protocol, int msgtype) 245 { 246 int msgindex; 247 248 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 249 msgindex = rtm_msgindex(msgtype); 250 251 if (rtnl_msg_handlers[protocol] == NULL) 252 return -ENOENT; 253 254 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 255 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 256 257 return 0; 258 } 259 EXPORT_SYMBOL_GPL(rtnl_unregister); 260 261 /** 262 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 263 * @protocol : Protocol family or PF_UNSPEC 264 * 265 * Identical to calling rtnl_unregster() for all registered message types 266 * of a certain protocol family. 267 */ 268 void rtnl_unregister_all(int protocol) 269 { 270 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 271 272 kfree(rtnl_msg_handlers[protocol]); 273 rtnl_msg_handlers[protocol] = NULL; 274 } 275 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 276 277 static LIST_HEAD(link_ops); 278 279 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 280 { 281 const struct rtnl_link_ops *ops; 282 283 list_for_each_entry(ops, &link_ops, list) { 284 if (!strcmp(ops->kind, kind)) 285 return ops; 286 } 287 return NULL; 288 } 289 290 /** 291 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 292 * @ops: struct rtnl_link_ops * to register 293 * 294 * The caller must hold the rtnl_mutex. This function should be used 295 * by drivers that create devices during module initialization. It 296 * must be called before registering the devices. 297 * 298 * Returns 0 on success or a negative error code. 299 */ 300 int __rtnl_link_register(struct rtnl_link_ops *ops) 301 { 302 if (rtnl_link_ops_get(ops->kind)) 303 return -EEXIST; 304 305 /* The check for setup is here because if ops 306 * does not have that filled up, it is not possible 307 * to use the ops for creating device. So do not 308 * fill up dellink as well. That disables rtnl_dellink. 309 */ 310 if (ops->setup && !ops->dellink) 311 ops->dellink = unregister_netdevice_queue; 312 313 list_add_tail(&ops->list, &link_ops); 314 return 0; 315 } 316 EXPORT_SYMBOL_GPL(__rtnl_link_register); 317 318 /** 319 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 320 * @ops: struct rtnl_link_ops * to register 321 * 322 * Returns 0 on success or a negative error code. 323 */ 324 int rtnl_link_register(struct rtnl_link_ops *ops) 325 { 326 int err; 327 328 rtnl_lock(); 329 err = __rtnl_link_register(ops); 330 rtnl_unlock(); 331 return err; 332 } 333 EXPORT_SYMBOL_GPL(rtnl_link_register); 334 335 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 336 { 337 struct net_device *dev; 338 LIST_HEAD(list_kill); 339 340 for_each_netdev(net, dev) { 341 if (dev->rtnl_link_ops == ops) 342 ops->dellink(dev, &list_kill); 343 } 344 unregister_netdevice_many(&list_kill); 345 } 346 347 /** 348 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 349 * @ops: struct rtnl_link_ops * to unregister 350 * 351 * The caller must hold the rtnl_mutex. 352 */ 353 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 354 { 355 struct net *net; 356 357 for_each_net(net) { 358 __rtnl_kill_links(net, ops); 359 } 360 list_del(&ops->list); 361 } 362 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 363 364 /* Return with the rtnl_lock held when there are no network 365 * devices unregistering in any network namespace. 366 */ 367 static void rtnl_lock_unregistering_all(void) 368 { 369 struct net *net; 370 bool unregistering; 371 DEFINE_WAIT_FUNC(wait, woken_wake_function); 372 373 add_wait_queue(&netdev_unregistering_wq, &wait); 374 for (;;) { 375 unregistering = false; 376 rtnl_lock(); 377 for_each_net(net) { 378 if (net->dev_unreg_count > 0) { 379 unregistering = true; 380 break; 381 } 382 } 383 if (!unregistering) 384 break; 385 __rtnl_unlock(); 386 387 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 388 } 389 remove_wait_queue(&netdev_unregistering_wq, &wait); 390 } 391 392 /** 393 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 394 * @ops: struct rtnl_link_ops * to unregister 395 */ 396 void rtnl_link_unregister(struct rtnl_link_ops *ops) 397 { 398 /* Close the race with cleanup_net() */ 399 mutex_lock(&net_mutex); 400 rtnl_lock_unregistering_all(); 401 __rtnl_link_unregister(ops); 402 rtnl_unlock(); 403 mutex_unlock(&net_mutex); 404 } 405 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 406 407 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 408 { 409 struct net_device *master_dev; 410 const struct rtnl_link_ops *ops; 411 412 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 413 if (!master_dev) 414 return 0; 415 ops = master_dev->rtnl_link_ops; 416 if (!ops || !ops->get_slave_size) 417 return 0; 418 /* IFLA_INFO_SLAVE_DATA + nested data */ 419 return nla_total_size(sizeof(struct nlattr)) + 420 ops->get_slave_size(master_dev, dev); 421 } 422 423 static size_t rtnl_link_get_size(const struct net_device *dev) 424 { 425 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 426 size_t size; 427 428 if (!ops) 429 return 0; 430 431 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 432 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 433 434 if (ops->get_size) 435 /* IFLA_INFO_DATA + nested data */ 436 size += nla_total_size(sizeof(struct nlattr)) + 437 ops->get_size(dev); 438 439 if (ops->get_xstats_size) 440 /* IFLA_INFO_XSTATS */ 441 size += nla_total_size(ops->get_xstats_size(dev)); 442 443 size += rtnl_link_get_slave_info_data_size(dev); 444 445 return size; 446 } 447 448 static LIST_HEAD(rtnl_af_ops); 449 450 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 451 { 452 const struct rtnl_af_ops *ops; 453 454 list_for_each_entry(ops, &rtnl_af_ops, list) { 455 if (ops->family == family) 456 return ops; 457 } 458 459 return NULL; 460 } 461 462 /** 463 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 464 * @ops: struct rtnl_af_ops * to register 465 * 466 * Returns 0 on success or a negative error code. 467 */ 468 void rtnl_af_register(struct rtnl_af_ops *ops) 469 { 470 rtnl_lock(); 471 list_add_tail(&ops->list, &rtnl_af_ops); 472 rtnl_unlock(); 473 } 474 EXPORT_SYMBOL_GPL(rtnl_af_register); 475 476 /** 477 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 478 * @ops: struct rtnl_af_ops * to unregister 479 * 480 * The caller must hold the rtnl_mutex. 481 */ 482 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 483 { 484 list_del(&ops->list); 485 } 486 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 487 488 /** 489 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 490 * @ops: struct rtnl_af_ops * to unregister 491 */ 492 void rtnl_af_unregister(struct rtnl_af_ops *ops) 493 { 494 rtnl_lock(); 495 __rtnl_af_unregister(ops); 496 rtnl_unlock(); 497 } 498 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 499 500 static size_t rtnl_link_get_af_size(const struct net_device *dev, 501 u32 ext_filter_mask) 502 { 503 struct rtnl_af_ops *af_ops; 504 size_t size; 505 506 /* IFLA_AF_SPEC */ 507 size = nla_total_size(sizeof(struct nlattr)); 508 509 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 510 if (af_ops->get_link_af_size) { 511 /* AF_* + nested data */ 512 size += nla_total_size(sizeof(struct nlattr)) + 513 af_ops->get_link_af_size(dev, ext_filter_mask); 514 } 515 } 516 517 return size; 518 } 519 520 static bool rtnl_have_link_slave_info(const struct net_device *dev) 521 { 522 struct net_device *master_dev; 523 524 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 525 if (master_dev && master_dev->rtnl_link_ops) 526 return true; 527 return false; 528 } 529 530 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 531 const struct net_device *dev) 532 { 533 struct net_device *master_dev; 534 const struct rtnl_link_ops *ops; 535 struct nlattr *slave_data; 536 int err; 537 538 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 539 if (!master_dev) 540 return 0; 541 ops = master_dev->rtnl_link_ops; 542 if (!ops) 543 return 0; 544 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 545 return -EMSGSIZE; 546 if (ops->fill_slave_info) { 547 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA); 548 if (!slave_data) 549 return -EMSGSIZE; 550 err = ops->fill_slave_info(skb, master_dev, dev); 551 if (err < 0) 552 goto err_cancel_slave_data; 553 nla_nest_end(skb, slave_data); 554 } 555 return 0; 556 557 err_cancel_slave_data: 558 nla_nest_cancel(skb, slave_data); 559 return err; 560 } 561 562 static int rtnl_link_info_fill(struct sk_buff *skb, 563 const struct net_device *dev) 564 { 565 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 566 struct nlattr *data; 567 int err; 568 569 if (!ops) 570 return 0; 571 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 572 return -EMSGSIZE; 573 if (ops->fill_xstats) { 574 err = ops->fill_xstats(skb, dev); 575 if (err < 0) 576 return err; 577 } 578 if (ops->fill_info) { 579 data = nla_nest_start(skb, IFLA_INFO_DATA); 580 if (data == NULL) 581 return -EMSGSIZE; 582 err = ops->fill_info(skb, dev); 583 if (err < 0) 584 goto err_cancel_data; 585 nla_nest_end(skb, data); 586 } 587 return 0; 588 589 err_cancel_data: 590 nla_nest_cancel(skb, data); 591 return err; 592 } 593 594 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 595 { 596 struct nlattr *linkinfo; 597 int err = -EMSGSIZE; 598 599 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 600 if (linkinfo == NULL) 601 goto out; 602 603 err = rtnl_link_info_fill(skb, dev); 604 if (err < 0) 605 goto err_cancel_link; 606 607 err = rtnl_link_slave_info_fill(skb, dev); 608 if (err < 0) 609 goto err_cancel_link; 610 611 nla_nest_end(skb, linkinfo); 612 return 0; 613 614 err_cancel_link: 615 nla_nest_cancel(skb, linkinfo); 616 out: 617 return err; 618 } 619 620 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 621 { 622 struct sock *rtnl = net->rtnl; 623 int err = 0; 624 625 NETLINK_CB(skb).dst_group = group; 626 if (echo) 627 atomic_inc(&skb->users); 628 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 629 if (echo) 630 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 631 return err; 632 } 633 634 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 635 { 636 struct sock *rtnl = net->rtnl; 637 638 return nlmsg_unicast(rtnl, skb, pid); 639 } 640 EXPORT_SYMBOL(rtnl_unicast); 641 642 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 643 struct nlmsghdr *nlh, gfp_t flags) 644 { 645 struct sock *rtnl = net->rtnl; 646 int report = 0; 647 648 if (nlh) 649 report = nlmsg_report(nlh); 650 651 nlmsg_notify(rtnl, skb, pid, group, report, flags); 652 } 653 EXPORT_SYMBOL(rtnl_notify); 654 655 void rtnl_set_sk_err(struct net *net, u32 group, int error) 656 { 657 struct sock *rtnl = net->rtnl; 658 659 netlink_set_err(rtnl, 0, group, error); 660 } 661 EXPORT_SYMBOL(rtnl_set_sk_err); 662 663 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 664 { 665 struct nlattr *mx; 666 int i, valid = 0; 667 668 mx = nla_nest_start(skb, RTA_METRICS); 669 if (mx == NULL) 670 return -ENOBUFS; 671 672 for (i = 0; i < RTAX_MAX; i++) { 673 if (metrics[i]) { 674 if (i == RTAX_CC_ALGO - 1) { 675 char tmp[TCP_CA_NAME_MAX], *name; 676 677 name = tcp_ca_get_name_by_key(metrics[i], tmp); 678 if (!name) 679 continue; 680 if (nla_put_string(skb, i + 1, name)) 681 goto nla_put_failure; 682 } else if (i == RTAX_FEATURES - 1) { 683 u32 user_features = metrics[i] & RTAX_FEATURE_MASK; 684 685 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); 686 if (nla_put_u32(skb, i + 1, user_features)) 687 goto nla_put_failure; 688 } else { 689 if (nla_put_u32(skb, i + 1, metrics[i])) 690 goto nla_put_failure; 691 } 692 valid++; 693 } 694 } 695 696 if (!valid) { 697 nla_nest_cancel(skb, mx); 698 return 0; 699 } 700 701 return nla_nest_end(skb, mx); 702 703 nla_put_failure: 704 nla_nest_cancel(skb, mx); 705 return -EMSGSIZE; 706 } 707 EXPORT_SYMBOL(rtnetlink_put_metrics); 708 709 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 710 long expires, u32 error) 711 { 712 struct rta_cacheinfo ci = { 713 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 714 .rta_used = dst->__use, 715 .rta_clntref = atomic_read(&(dst->__refcnt)), 716 .rta_error = error, 717 .rta_id = id, 718 }; 719 720 if (expires) { 721 unsigned long clock; 722 723 clock = jiffies_to_clock_t(abs(expires)); 724 clock = min_t(unsigned long, clock, INT_MAX); 725 ci.rta_expires = (expires > 0) ? clock : -clock; 726 } 727 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 728 } 729 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 730 731 static void set_operstate(struct net_device *dev, unsigned char transition) 732 { 733 unsigned char operstate = dev->operstate; 734 735 switch (transition) { 736 case IF_OPER_UP: 737 if ((operstate == IF_OPER_DORMANT || 738 operstate == IF_OPER_UNKNOWN) && 739 !netif_dormant(dev)) 740 operstate = IF_OPER_UP; 741 break; 742 743 case IF_OPER_DORMANT: 744 if (operstate == IF_OPER_UP || 745 operstate == IF_OPER_UNKNOWN) 746 operstate = IF_OPER_DORMANT; 747 break; 748 } 749 750 if (dev->operstate != operstate) { 751 write_lock_bh(&dev_base_lock); 752 dev->operstate = operstate; 753 write_unlock_bh(&dev_base_lock); 754 netdev_state_change(dev); 755 } 756 } 757 758 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 759 { 760 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 761 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 762 } 763 764 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 765 const struct ifinfomsg *ifm) 766 { 767 unsigned int flags = ifm->ifi_flags; 768 769 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 770 if (ifm->ifi_change) 771 flags = (flags & ifm->ifi_change) | 772 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 773 774 return flags; 775 } 776 777 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 778 const struct rtnl_link_stats64 *b) 779 { 780 a->rx_packets = b->rx_packets; 781 a->tx_packets = b->tx_packets; 782 a->rx_bytes = b->rx_bytes; 783 a->tx_bytes = b->tx_bytes; 784 a->rx_errors = b->rx_errors; 785 a->tx_errors = b->tx_errors; 786 a->rx_dropped = b->rx_dropped; 787 a->tx_dropped = b->tx_dropped; 788 789 a->multicast = b->multicast; 790 a->collisions = b->collisions; 791 792 a->rx_length_errors = b->rx_length_errors; 793 a->rx_over_errors = b->rx_over_errors; 794 a->rx_crc_errors = b->rx_crc_errors; 795 a->rx_frame_errors = b->rx_frame_errors; 796 a->rx_fifo_errors = b->rx_fifo_errors; 797 a->rx_missed_errors = b->rx_missed_errors; 798 799 a->tx_aborted_errors = b->tx_aborted_errors; 800 a->tx_carrier_errors = b->tx_carrier_errors; 801 a->tx_fifo_errors = b->tx_fifo_errors; 802 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 803 a->tx_window_errors = b->tx_window_errors; 804 805 a->rx_compressed = b->rx_compressed; 806 a->tx_compressed = b->tx_compressed; 807 808 a->rx_nohandler = b->rx_nohandler; 809 } 810 811 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 812 { 813 memcpy(v, b, sizeof(*b)); 814 } 815 816 /* All VF info */ 817 static inline int rtnl_vfinfo_size(const struct net_device *dev, 818 u32 ext_filter_mask) 819 { 820 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 821 (ext_filter_mask & RTEXT_FILTER_VF)) { 822 int num_vfs = dev_num_vf(dev->dev.parent); 823 size_t size = nla_total_size(sizeof(struct nlattr)); 824 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 825 size += num_vfs * 826 (nla_total_size(sizeof(struct ifla_vf_mac)) + 827 nla_total_size(sizeof(struct ifla_vf_vlan)) + 828 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 829 nla_total_size(sizeof(struct ifla_vf_rate)) + 830 nla_total_size(sizeof(struct ifla_vf_link_state)) + 831 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) + 832 /* IFLA_VF_STATS_RX_PACKETS */ 833 nla_total_size(sizeof(__u64)) + 834 /* IFLA_VF_STATS_TX_PACKETS */ 835 nla_total_size(sizeof(__u64)) + 836 /* IFLA_VF_STATS_RX_BYTES */ 837 nla_total_size(sizeof(__u64)) + 838 /* IFLA_VF_STATS_TX_BYTES */ 839 nla_total_size(sizeof(__u64)) + 840 /* IFLA_VF_STATS_BROADCAST */ 841 nla_total_size(sizeof(__u64)) + 842 /* IFLA_VF_STATS_MULTICAST */ 843 nla_total_size(sizeof(__u64)) + 844 nla_total_size(sizeof(struct ifla_vf_trust))); 845 return size; 846 } else 847 return 0; 848 } 849 850 static size_t rtnl_port_size(const struct net_device *dev, 851 u32 ext_filter_mask) 852 { 853 size_t port_size = nla_total_size(4) /* PORT_VF */ 854 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 855 + nla_total_size(sizeof(struct ifla_port_vsi)) 856 /* PORT_VSI_TYPE */ 857 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 858 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 859 + nla_total_size(1) /* PROT_VDP_REQUEST */ 860 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 861 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 862 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 863 + port_size; 864 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 865 + port_size; 866 867 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 868 !(ext_filter_mask & RTEXT_FILTER_VF)) 869 return 0; 870 if (dev_num_vf(dev->dev.parent)) 871 return port_self_size + vf_ports_size + 872 vf_port_size * dev_num_vf(dev->dev.parent); 873 else 874 return port_self_size; 875 } 876 877 static noinline size_t if_nlmsg_size(const struct net_device *dev, 878 u32 ext_filter_mask) 879 { 880 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 881 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 882 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 883 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 884 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 885 + nla_total_size(sizeof(struct rtnl_link_stats)) 886 + nla_total_size(sizeof(struct rtnl_link_stats64)) 887 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 888 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 889 + nla_total_size(4) /* IFLA_TXQLEN */ 890 + nla_total_size(4) /* IFLA_WEIGHT */ 891 + nla_total_size(4) /* IFLA_MTU */ 892 + nla_total_size(4) /* IFLA_LINK */ 893 + nla_total_size(4) /* IFLA_MASTER */ 894 + nla_total_size(1) /* IFLA_CARRIER */ 895 + nla_total_size(4) /* IFLA_PROMISCUITY */ 896 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 897 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 898 + nla_total_size(1) /* IFLA_OPERSTATE */ 899 + nla_total_size(1) /* IFLA_LINKMODE */ 900 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 901 + nla_total_size(4) /* IFLA_LINK_NETNSID */ 902 + nla_total_size(ext_filter_mask 903 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 904 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 905 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 906 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 907 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */ 908 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */ 909 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */ 910 + nla_total_size(1); /* IFLA_PROTO_DOWN */ 911 912 } 913 914 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 915 { 916 struct nlattr *vf_ports; 917 struct nlattr *vf_port; 918 int vf; 919 int err; 920 921 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 922 if (!vf_ports) 923 return -EMSGSIZE; 924 925 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 926 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 927 if (!vf_port) 928 goto nla_put_failure; 929 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 930 goto nla_put_failure; 931 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 932 if (err == -EMSGSIZE) 933 goto nla_put_failure; 934 if (err) { 935 nla_nest_cancel(skb, vf_port); 936 continue; 937 } 938 nla_nest_end(skb, vf_port); 939 } 940 941 nla_nest_end(skb, vf_ports); 942 943 return 0; 944 945 nla_put_failure: 946 nla_nest_cancel(skb, vf_ports); 947 return -EMSGSIZE; 948 } 949 950 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 951 { 952 struct nlattr *port_self; 953 int err; 954 955 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 956 if (!port_self) 957 return -EMSGSIZE; 958 959 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 960 if (err) { 961 nla_nest_cancel(skb, port_self); 962 return (err == -EMSGSIZE) ? err : 0; 963 } 964 965 nla_nest_end(skb, port_self); 966 967 return 0; 968 } 969 970 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 971 u32 ext_filter_mask) 972 { 973 int err; 974 975 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 976 !(ext_filter_mask & RTEXT_FILTER_VF)) 977 return 0; 978 979 err = rtnl_port_self_fill(skb, dev); 980 if (err) 981 return err; 982 983 if (dev_num_vf(dev->dev.parent)) { 984 err = rtnl_vf_ports_fill(skb, dev); 985 if (err) 986 return err; 987 } 988 989 return 0; 990 } 991 992 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 993 { 994 int err; 995 struct netdev_phys_item_id ppid; 996 997 err = dev_get_phys_port_id(dev, &ppid); 998 if (err) { 999 if (err == -EOPNOTSUPP) 1000 return 0; 1001 return err; 1002 } 1003 1004 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 1005 return -EMSGSIZE; 1006 1007 return 0; 1008 } 1009 1010 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev) 1011 { 1012 char name[IFNAMSIZ]; 1013 int err; 1014 1015 err = dev_get_phys_port_name(dev, name, sizeof(name)); 1016 if (err) { 1017 if (err == -EOPNOTSUPP) 1018 return 0; 1019 return err; 1020 } 1021 1022 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name)) 1023 return -EMSGSIZE; 1024 1025 return 0; 1026 } 1027 1028 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev) 1029 { 1030 int err; 1031 struct switchdev_attr attr = { 1032 .orig_dev = dev, 1033 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 1034 .flags = SWITCHDEV_F_NO_RECURSE, 1035 }; 1036 1037 err = switchdev_port_attr_get(dev, &attr); 1038 if (err) { 1039 if (err == -EOPNOTSUPP) 1040 return 0; 1041 return err; 1042 } 1043 1044 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len, 1045 attr.u.ppid.id)) 1046 return -EMSGSIZE; 1047 1048 return 0; 1049 } 1050 1051 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 1052 struct net_device *dev) 1053 { 1054 const struct rtnl_link_stats64 *stats; 1055 struct rtnl_link_stats64 temp; 1056 struct nlattr *attr; 1057 1058 stats = dev_get_stats(dev, &temp); 1059 1060 attr = nla_reserve(skb, IFLA_STATS, 1061 sizeof(struct rtnl_link_stats)); 1062 if (!attr) 1063 return -EMSGSIZE; 1064 1065 copy_rtnl_link_stats(nla_data(attr), stats); 1066 1067 attr = nla_reserve(skb, IFLA_STATS64, 1068 sizeof(struct rtnl_link_stats64)); 1069 if (!attr) 1070 return -EMSGSIZE; 1071 1072 copy_rtnl_link_stats64(nla_data(attr), stats); 1073 1074 return 0; 1075 } 1076 1077 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 1078 struct net_device *dev, 1079 int vfs_num, 1080 struct nlattr *vfinfo) 1081 { 1082 struct ifla_vf_rss_query_en vf_rss_query_en; 1083 struct ifla_vf_link_state vf_linkstate; 1084 struct ifla_vf_spoofchk vf_spoofchk; 1085 struct ifla_vf_tx_rate vf_tx_rate; 1086 struct ifla_vf_stats vf_stats; 1087 struct ifla_vf_trust vf_trust; 1088 struct ifla_vf_vlan vf_vlan; 1089 struct ifla_vf_rate vf_rate; 1090 struct nlattr *vf, *vfstats; 1091 struct ifla_vf_mac vf_mac; 1092 struct ifla_vf_info ivi; 1093 1094 /* Not all SR-IOV capable drivers support the 1095 * spoofcheck and "RSS query enable" query. Preset to 1096 * -1 so the user space tool can detect that the driver 1097 * didn't report anything. 1098 */ 1099 ivi.spoofchk = -1; 1100 ivi.rss_query_en = -1; 1101 ivi.trusted = -1; 1102 memset(ivi.mac, 0, sizeof(ivi.mac)); 1103 /* The default value for VF link state is "auto" 1104 * IFLA_VF_LINK_STATE_AUTO which equals zero 1105 */ 1106 ivi.linkstate = 0; 1107 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)) 1108 return 0; 1109 1110 vf_mac.vf = 1111 vf_vlan.vf = 1112 vf_rate.vf = 1113 vf_tx_rate.vf = 1114 vf_spoofchk.vf = 1115 vf_linkstate.vf = 1116 vf_rss_query_en.vf = 1117 vf_trust.vf = ivi.vf; 1118 1119 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1120 vf_vlan.vlan = ivi.vlan; 1121 vf_vlan.qos = ivi.qos; 1122 vf_tx_rate.rate = ivi.max_tx_rate; 1123 vf_rate.min_tx_rate = ivi.min_tx_rate; 1124 vf_rate.max_tx_rate = ivi.max_tx_rate; 1125 vf_spoofchk.setting = ivi.spoofchk; 1126 vf_linkstate.link_state = ivi.linkstate; 1127 vf_rss_query_en.setting = ivi.rss_query_en; 1128 vf_trust.setting = ivi.trusted; 1129 vf = nla_nest_start(skb, IFLA_VF_INFO); 1130 if (!vf) { 1131 nla_nest_cancel(skb, vfinfo); 1132 return -EMSGSIZE; 1133 } 1134 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1135 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1136 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1137 &vf_rate) || 1138 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1139 &vf_tx_rate) || 1140 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1141 &vf_spoofchk) || 1142 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1143 &vf_linkstate) || 1144 nla_put(skb, IFLA_VF_RSS_QUERY_EN, 1145 sizeof(vf_rss_query_en), 1146 &vf_rss_query_en) || 1147 nla_put(skb, IFLA_VF_TRUST, 1148 sizeof(vf_trust), &vf_trust)) 1149 return -EMSGSIZE; 1150 memset(&vf_stats, 0, sizeof(vf_stats)); 1151 if (dev->netdev_ops->ndo_get_vf_stats) 1152 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num, 1153 &vf_stats); 1154 vfstats = nla_nest_start(skb, IFLA_VF_STATS); 1155 if (!vfstats) { 1156 nla_nest_cancel(skb, vf); 1157 nla_nest_cancel(skb, vfinfo); 1158 return -EMSGSIZE; 1159 } 1160 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS, 1161 vf_stats.rx_packets) || 1162 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS, 1163 vf_stats.tx_packets) || 1164 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES, 1165 vf_stats.rx_bytes) || 1166 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES, 1167 vf_stats.tx_bytes) || 1168 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST, 1169 vf_stats.broadcast) || 1170 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST, 1171 vf_stats.multicast)) 1172 return -EMSGSIZE; 1173 nla_nest_end(skb, vfstats); 1174 nla_nest_end(skb, vf); 1175 return 0; 1176 } 1177 1178 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) 1179 { 1180 struct rtnl_link_ifmap map = { 1181 .mem_start = dev->mem_start, 1182 .mem_end = dev->mem_end, 1183 .base_addr = dev->base_addr, 1184 .irq = dev->irq, 1185 .dma = dev->dma, 1186 .port = dev->if_port, 1187 }; 1188 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1189 return -EMSGSIZE; 1190 1191 return 0; 1192 } 1193 1194 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 1195 int type, u32 pid, u32 seq, u32 change, 1196 unsigned int flags, u32 ext_filter_mask) 1197 { 1198 struct ifinfomsg *ifm; 1199 struct nlmsghdr *nlh; 1200 struct nlattr *af_spec; 1201 struct rtnl_af_ops *af_ops; 1202 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1203 1204 ASSERT_RTNL(); 1205 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 1206 if (nlh == NULL) 1207 return -EMSGSIZE; 1208 1209 ifm = nlmsg_data(nlh); 1210 ifm->ifi_family = AF_UNSPEC; 1211 ifm->__ifi_pad = 0; 1212 ifm->ifi_type = dev->type; 1213 ifm->ifi_index = dev->ifindex; 1214 ifm->ifi_flags = dev_get_flags(dev); 1215 ifm->ifi_change = change; 1216 1217 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 1218 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 1219 nla_put_u8(skb, IFLA_OPERSTATE, 1220 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 1221 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1222 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1223 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1224 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1225 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1226 #ifdef CONFIG_RPS 1227 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1228 #endif 1229 (dev->ifindex != dev_get_iflink(dev) && 1230 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 1231 (upper_dev && 1232 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1233 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1234 (dev->qdisc && 1235 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1236 (dev->ifalias && 1237 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1238 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1239 atomic_read(&dev->carrier_changes)) || 1240 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down)) 1241 goto nla_put_failure; 1242 1243 if (rtnl_fill_link_ifmap(skb, dev)) 1244 goto nla_put_failure; 1245 1246 if (dev->addr_len) { 1247 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1248 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1249 goto nla_put_failure; 1250 } 1251 1252 if (rtnl_phys_port_id_fill(skb, dev)) 1253 goto nla_put_failure; 1254 1255 if (rtnl_phys_port_name_fill(skb, dev)) 1256 goto nla_put_failure; 1257 1258 if (rtnl_phys_switch_id_fill(skb, dev)) 1259 goto nla_put_failure; 1260 1261 if (rtnl_fill_stats(skb, dev)) 1262 goto nla_put_failure; 1263 1264 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1265 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1266 goto nla_put_failure; 1267 1268 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent && 1269 ext_filter_mask & RTEXT_FILTER_VF) { 1270 int i; 1271 struct nlattr *vfinfo; 1272 int num_vfs = dev_num_vf(dev->dev.parent); 1273 1274 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1275 if (!vfinfo) 1276 goto nla_put_failure; 1277 for (i = 0; i < num_vfs; i++) { 1278 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo)) 1279 goto nla_put_failure; 1280 } 1281 1282 nla_nest_end(skb, vfinfo); 1283 } 1284 1285 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1286 goto nla_put_failure; 1287 1288 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1289 if (rtnl_link_fill(skb, dev) < 0) 1290 goto nla_put_failure; 1291 } 1292 1293 if (dev->rtnl_link_ops && 1294 dev->rtnl_link_ops->get_link_net) { 1295 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); 1296 1297 if (!net_eq(dev_net(dev), link_net)) { 1298 int id = peernet2id_alloc(dev_net(dev), link_net); 1299 1300 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) 1301 goto nla_put_failure; 1302 } 1303 } 1304 1305 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1306 goto nla_put_failure; 1307 1308 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1309 if (af_ops->fill_link_af) { 1310 struct nlattr *af; 1311 int err; 1312 1313 if (!(af = nla_nest_start(skb, af_ops->family))) 1314 goto nla_put_failure; 1315 1316 err = af_ops->fill_link_af(skb, dev, ext_filter_mask); 1317 1318 /* 1319 * Caller may return ENODATA to indicate that there 1320 * was no data to be dumped. This is not an error, it 1321 * means we should trim the attribute header and 1322 * continue. 1323 */ 1324 if (err == -ENODATA) 1325 nla_nest_cancel(skb, af); 1326 else if (err < 0) 1327 goto nla_put_failure; 1328 1329 nla_nest_end(skb, af); 1330 } 1331 } 1332 1333 nla_nest_end(skb, af_spec); 1334 1335 nlmsg_end(skb, nlh); 1336 return 0; 1337 1338 nla_put_failure: 1339 nlmsg_cancel(skb, nlh); 1340 return -EMSGSIZE; 1341 } 1342 1343 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1344 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1345 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1346 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1347 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1348 [IFLA_MTU] = { .type = NLA_U32 }, 1349 [IFLA_LINK] = { .type = NLA_U32 }, 1350 [IFLA_MASTER] = { .type = NLA_U32 }, 1351 [IFLA_CARRIER] = { .type = NLA_U8 }, 1352 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1353 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1354 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1355 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1356 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1357 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1358 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1359 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1360 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1361 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1362 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1363 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1364 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1365 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1366 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1367 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1368 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1369 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1370 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN }, 1371 [IFLA_LINK_NETNSID] = { .type = NLA_S32 }, 1372 [IFLA_PROTO_DOWN] = { .type = NLA_U8 }, 1373 }; 1374 1375 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1376 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1377 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1378 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1379 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1380 }; 1381 1382 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1383 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) }, 1384 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) }, 1385 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) }, 1386 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) }, 1387 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) }, 1388 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) }, 1389 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) }, 1390 [IFLA_VF_STATS] = { .type = NLA_NESTED }, 1391 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) }, 1392 }; 1393 1394 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1395 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1396 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1397 .len = PORT_PROFILE_MAX }, 1398 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1399 .len = sizeof(struct ifla_port_vsi)}, 1400 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1401 .len = PORT_UUID_MAX }, 1402 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1403 .len = PORT_UUID_MAX }, 1404 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1405 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1406 }; 1407 1408 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) 1409 { 1410 const struct rtnl_link_ops *ops = NULL; 1411 struct nlattr *linfo[IFLA_INFO_MAX + 1]; 1412 1413 if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0) 1414 return NULL; 1415 1416 if (linfo[IFLA_INFO_KIND]) { 1417 char kind[MODULE_NAME_LEN]; 1418 1419 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind)); 1420 ops = rtnl_link_ops_get(kind); 1421 } 1422 1423 return ops; 1424 } 1425 1426 static bool link_master_filtered(struct net_device *dev, int master_idx) 1427 { 1428 struct net_device *master; 1429 1430 if (!master_idx) 1431 return false; 1432 1433 master = netdev_master_upper_dev_get(dev); 1434 if (!master || master->ifindex != master_idx) 1435 return true; 1436 1437 return false; 1438 } 1439 1440 static bool link_kind_filtered(const struct net_device *dev, 1441 const struct rtnl_link_ops *kind_ops) 1442 { 1443 if (kind_ops && dev->rtnl_link_ops != kind_ops) 1444 return true; 1445 1446 return false; 1447 } 1448 1449 static bool link_dump_filtered(struct net_device *dev, 1450 int master_idx, 1451 const struct rtnl_link_ops *kind_ops) 1452 { 1453 if (link_master_filtered(dev, master_idx) || 1454 link_kind_filtered(dev, kind_ops)) 1455 return true; 1456 1457 return false; 1458 } 1459 1460 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1461 { 1462 struct net *net = sock_net(skb->sk); 1463 int h, s_h; 1464 int idx = 0, s_idx; 1465 struct net_device *dev; 1466 struct hlist_head *head; 1467 struct nlattr *tb[IFLA_MAX+1]; 1468 u32 ext_filter_mask = 0; 1469 const struct rtnl_link_ops *kind_ops = NULL; 1470 unsigned int flags = NLM_F_MULTI; 1471 int master_idx = 0; 1472 int err; 1473 int hdrlen; 1474 1475 s_h = cb->args[0]; 1476 s_idx = cb->args[1]; 1477 1478 cb->seq = net->dev_base_seq; 1479 1480 /* A hack to preserve kernel<->userspace interface. 1481 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1482 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1483 * what iproute2 < v3.9.0 used. 1484 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1485 * attribute, its netlink message is shorter than struct ifinfomsg. 1486 */ 1487 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1488 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1489 1490 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1491 1492 if (tb[IFLA_EXT_MASK]) 1493 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1494 1495 if (tb[IFLA_MASTER]) 1496 master_idx = nla_get_u32(tb[IFLA_MASTER]); 1497 1498 if (tb[IFLA_LINKINFO]) 1499 kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]); 1500 1501 if (master_idx || kind_ops) 1502 flags |= NLM_F_DUMP_FILTERED; 1503 } 1504 1505 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1506 idx = 0; 1507 head = &net->dev_index_head[h]; 1508 hlist_for_each_entry(dev, head, index_hlist) { 1509 if (link_dump_filtered(dev, master_idx, kind_ops)) 1510 continue; 1511 if (idx < s_idx) 1512 goto cont; 1513 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1514 NETLINK_CB(cb->skb).portid, 1515 cb->nlh->nlmsg_seq, 0, 1516 flags, 1517 ext_filter_mask); 1518 /* If we ran out of room on the first message, 1519 * we're in trouble 1520 */ 1521 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1522 1523 if (err < 0) 1524 goto out; 1525 1526 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1527 cont: 1528 idx++; 1529 } 1530 } 1531 out: 1532 cb->args[1] = idx; 1533 cb->args[0] = h; 1534 1535 return skb->len; 1536 } 1537 1538 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1539 { 1540 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1541 } 1542 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1543 1544 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1545 { 1546 struct net *net; 1547 /* Examine the link attributes and figure out which 1548 * network namespace we are talking about. 1549 */ 1550 if (tb[IFLA_NET_NS_PID]) 1551 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1552 else if (tb[IFLA_NET_NS_FD]) 1553 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1554 else 1555 net = get_net(src_net); 1556 return net; 1557 } 1558 EXPORT_SYMBOL(rtnl_link_get_net); 1559 1560 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1561 { 1562 if (dev) { 1563 if (tb[IFLA_ADDRESS] && 1564 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1565 return -EINVAL; 1566 1567 if (tb[IFLA_BROADCAST] && 1568 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1569 return -EINVAL; 1570 } 1571 1572 if (tb[IFLA_AF_SPEC]) { 1573 struct nlattr *af; 1574 int rem, err; 1575 1576 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1577 const struct rtnl_af_ops *af_ops; 1578 1579 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1580 return -EAFNOSUPPORT; 1581 1582 if (!af_ops->set_link_af) 1583 return -EOPNOTSUPP; 1584 1585 if (af_ops->validate_link_af) { 1586 err = af_ops->validate_link_af(dev, af); 1587 if (err < 0) 1588 return err; 1589 } 1590 } 1591 } 1592 1593 return 0; 1594 } 1595 1596 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) 1597 { 1598 const struct net_device_ops *ops = dev->netdev_ops; 1599 int err = -EINVAL; 1600 1601 if (tb[IFLA_VF_MAC]) { 1602 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]); 1603 1604 err = -EOPNOTSUPP; 1605 if (ops->ndo_set_vf_mac) 1606 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1607 ivm->mac); 1608 if (err < 0) 1609 return err; 1610 } 1611 1612 if (tb[IFLA_VF_VLAN]) { 1613 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]); 1614 1615 err = -EOPNOTSUPP; 1616 if (ops->ndo_set_vf_vlan) 1617 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan, 1618 ivv->qos); 1619 if (err < 0) 1620 return err; 1621 } 1622 1623 if (tb[IFLA_VF_TX_RATE]) { 1624 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1625 struct ifla_vf_info ivf; 1626 1627 err = -EOPNOTSUPP; 1628 if (ops->ndo_get_vf_config) 1629 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf); 1630 if (err < 0) 1631 return err; 1632 1633 err = -EOPNOTSUPP; 1634 if (ops->ndo_set_vf_rate) 1635 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1636 ivf.min_tx_rate, 1637 ivt->rate); 1638 if (err < 0) 1639 return err; 1640 } 1641 1642 if (tb[IFLA_VF_RATE]) { 1643 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]); 1644 1645 err = -EOPNOTSUPP; 1646 if (ops->ndo_set_vf_rate) 1647 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1648 ivt->min_tx_rate, 1649 ivt->max_tx_rate); 1650 if (err < 0) 1651 return err; 1652 } 1653 1654 if (tb[IFLA_VF_SPOOFCHK]) { 1655 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]); 1656 1657 err = -EOPNOTSUPP; 1658 if (ops->ndo_set_vf_spoofchk) 1659 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1660 ivs->setting); 1661 if (err < 0) 1662 return err; 1663 } 1664 1665 if (tb[IFLA_VF_LINK_STATE]) { 1666 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]); 1667 1668 err = -EOPNOTSUPP; 1669 if (ops->ndo_set_vf_link_state) 1670 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1671 ivl->link_state); 1672 if (err < 0) 1673 return err; 1674 } 1675 1676 if (tb[IFLA_VF_RSS_QUERY_EN]) { 1677 struct ifla_vf_rss_query_en *ivrssq_en; 1678 1679 err = -EOPNOTSUPP; 1680 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]); 1681 if (ops->ndo_set_vf_rss_query_en) 1682 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf, 1683 ivrssq_en->setting); 1684 if (err < 0) 1685 return err; 1686 } 1687 1688 if (tb[IFLA_VF_TRUST]) { 1689 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]); 1690 1691 err = -EOPNOTSUPP; 1692 if (ops->ndo_set_vf_trust) 1693 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting); 1694 if (err < 0) 1695 return err; 1696 } 1697 1698 return err; 1699 } 1700 1701 static int do_set_master(struct net_device *dev, int ifindex) 1702 { 1703 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1704 const struct net_device_ops *ops; 1705 int err; 1706 1707 if (upper_dev) { 1708 if (upper_dev->ifindex == ifindex) 1709 return 0; 1710 ops = upper_dev->netdev_ops; 1711 if (ops->ndo_del_slave) { 1712 err = ops->ndo_del_slave(upper_dev, dev); 1713 if (err) 1714 return err; 1715 } else { 1716 return -EOPNOTSUPP; 1717 } 1718 } 1719 1720 if (ifindex) { 1721 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1722 if (!upper_dev) 1723 return -EINVAL; 1724 ops = upper_dev->netdev_ops; 1725 if (ops->ndo_add_slave) { 1726 err = ops->ndo_add_slave(upper_dev, dev); 1727 if (err) 1728 return err; 1729 } else { 1730 return -EOPNOTSUPP; 1731 } 1732 } 1733 return 0; 1734 } 1735 1736 #define DO_SETLINK_MODIFIED 0x01 1737 /* notify flag means notify + modified. */ 1738 #define DO_SETLINK_NOTIFY 0x03 1739 static int do_setlink(const struct sk_buff *skb, 1740 struct net_device *dev, struct ifinfomsg *ifm, 1741 struct nlattr **tb, char *ifname, int status) 1742 { 1743 const struct net_device_ops *ops = dev->netdev_ops; 1744 int err; 1745 1746 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1747 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1748 if (IS_ERR(net)) { 1749 err = PTR_ERR(net); 1750 goto errout; 1751 } 1752 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1753 put_net(net); 1754 err = -EPERM; 1755 goto errout; 1756 } 1757 err = dev_change_net_namespace(dev, net, ifname); 1758 put_net(net); 1759 if (err) 1760 goto errout; 1761 status |= DO_SETLINK_MODIFIED; 1762 } 1763 1764 if (tb[IFLA_MAP]) { 1765 struct rtnl_link_ifmap *u_map; 1766 struct ifmap k_map; 1767 1768 if (!ops->ndo_set_config) { 1769 err = -EOPNOTSUPP; 1770 goto errout; 1771 } 1772 1773 if (!netif_device_present(dev)) { 1774 err = -ENODEV; 1775 goto errout; 1776 } 1777 1778 u_map = nla_data(tb[IFLA_MAP]); 1779 k_map.mem_start = (unsigned long) u_map->mem_start; 1780 k_map.mem_end = (unsigned long) u_map->mem_end; 1781 k_map.base_addr = (unsigned short) u_map->base_addr; 1782 k_map.irq = (unsigned char) u_map->irq; 1783 k_map.dma = (unsigned char) u_map->dma; 1784 k_map.port = (unsigned char) u_map->port; 1785 1786 err = ops->ndo_set_config(dev, &k_map); 1787 if (err < 0) 1788 goto errout; 1789 1790 status |= DO_SETLINK_NOTIFY; 1791 } 1792 1793 if (tb[IFLA_ADDRESS]) { 1794 struct sockaddr *sa; 1795 int len; 1796 1797 len = sizeof(sa_family_t) + dev->addr_len; 1798 sa = kmalloc(len, GFP_KERNEL); 1799 if (!sa) { 1800 err = -ENOMEM; 1801 goto errout; 1802 } 1803 sa->sa_family = dev->type; 1804 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1805 dev->addr_len); 1806 err = dev_set_mac_address(dev, sa); 1807 kfree(sa); 1808 if (err) 1809 goto errout; 1810 status |= DO_SETLINK_MODIFIED; 1811 } 1812 1813 if (tb[IFLA_MTU]) { 1814 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1815 if (err < 0) 1816 goto errout; 1817 status |= DO_SETLINK_MODIFIED; 1818 } 1819 1820 if (tb[IFLA_GROUP]) { 1821 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1822 status |= DO_SETLINK_NOTIFY; 1823 } 1824 1825 /* 1826 * Interface selected by interface index but interface 1827 * name provided implies that a name change has been 1828 * requested. 1829 */ 1830 if (ifm->ifi_index > 0 && ifname[0]) { 1831 err = dev_change_name(dev, ifname); 1832 if (err < 0) 1833 goto errout; 1834 status |= DO_SETLINK_MODIFIED; 1835 } 1836 1837 if (tb[IFLA_IFALIAS]) { 1838 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1839 nla_len(tb[IFLA_IFALIAS])); 1840 if (err < 0) 1841 goto errout; 1842 status |= DO_SETLINK_NOTIFY; 1843 } 1844 1845 if (tb[IFLA_BROADCAST]) { 1846 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1847 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1848 } 1849 1850 if (ifm->ifi_flags || ifm->ifi_change) { 1851 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1852 if (err < 0) 1853 goto errout; 1854 } 1855 1856 if (tb[IFLA_MASTER]) { 1857 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1858 if (err) 1859 goto errout; 1860 status |= DO_SETLINK_MODIFIED; 1861 } 1862 1863 if (tb[IFLA_CARRIER]) { 1864 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1865 if (err) 1866 goto errout; 1867 status |= DO_SETLINK_MODIFIED; 1868 } 1869 1870 if (tb[IFLA_TXQLEN]) { 1871 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1872 1873 if (dev->tx_queue_len ^ value) 1874 status |= DO_SETLINK_NOTIFY; 1875 1876 dev->tx_queue_len = value; 1877 } 1878 1879 if (tb[IFLA_OPERSTATE]) 1880 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1881 1882 if (tb[IFLA_LINKMODE]) { 1883 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1884 1885 write_lock_bh(&dev_base_lock); 1886 if (dev->link_mode ^ value) 1887 status |= DO_SETLINK_NOTIFY; 1888 dev->link_mode = value; 1889 write_unlock_bh(&dev_base_lock); 1890 } 1891 1892 if (tb[IFLA_VFINFO_LIST]) { 1893 struct nlattr *vfinfo[IFLA_VF_MAX + 1]; 1894 struct nlattr *attr; 1895 int rem; 1896 1897 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1898 if (nla_type(attr) != IFLA_VF_INFO || 1899 nla_len(attr) < NLA_HDRLEN) { 1900 err = -EINVAL; 1901 goto errout; 1902 } 1903 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr, 1904 ifla_vf_policy); 1905 if (err < 0) 1906 goto errout; 1907 err = do_setvfinfo(dev, vfinfo); 1908 if (err < 0) 1909 goto errout; 1910 status |= DO_SETLINK_NOTIFY; 1911 } 1912 } 1913 err = 0; 1914 1915 if (tb[IFLA_VF_PORTS]) { 1916 struct nlattr *port[IFLA_PORT_MAX+1]; 1917 struct nlattr *attr; 1918 int vf; 1919 int rem; 1920 1921 err = -EOPNOTSUPP; 1922 if (!ops->ndo_set_vf_port) 1923 goto errout; 1924 1925 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1926 if (nla_type(attr) != IFLA_VF_PORT || 1927 nla_len(attr) < NLA_HDRLEN) { 1928 err = -EINVAL; 1929 goto errout; 1930 } 1931 err = nla_parse_nested(port, IFLA_PORT_MAX, attr, 1932 ifla_port_policy); 1933 if (err < 0) 1934 goto errout; 1935 if (!port[IFLA_PORT_VF]) { 1936 err = -EOPNOTSUPP; 1937 goto errout; 1938 } 1939 vf = nla_get_u32(port[IFLA_PORT_VF]); 1940 err = ops->ndo_set_vf_port(dev, vf, port); 1941 if (err < 0) 1942 goto errout; 1943 status |= DO_SETLINK_NOTIFY; 1944 } 1945 } 1946 err = 0; 1947 1948 if (tb[IFLA_PORT_SELF]) { 1949 struct nlattr *port[IFLA_PORT_MAX+1]; 1950 1951 err = nla_parse_nested(port, IFLA_PORT_MAX, 1952 tb[IFLA_PORT_SELF], ifla_port_policy); 1953 if (err < 0) 1954 goto errout; 1955 1956 err = -EOPNOTSUPP; 1957 if (ops->ndo_set_vf_port) 1958 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1959 if (err < 0) 1960 goto errout; 1961 status |= DO_SETLINK_NOTIFY; 1962 } 1963 1964 if (tb[IFLA_AF_SPEC]) { 1965 struct nlattr *af; 1966 int rem; 1967 1968 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1969 const struct rtnl_af_ops *af_ops; 1970 1971 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1972 BUG(); 1973 1974 err = af_ops->set_link_af(dev, af); 1975 if (err < 0) 1976 goto errout; 1977 1978 status |= DO_SETLINK_NOTIFY; 1979 } 1980 } 1981 err = 0; 1982 1983 if (tb[IFLA_PROTO_DOWN]) { 1984 err = dev_change_proto_down(dev, 1985 nla_get_u8(tb[IFLA_PROTO_DOWN])); 1986 if (err) 1987 goto errout; 1988 status |= DO_SETLINK_NOTIFY; 1989 } 1990 1991 errout: 1992 if (status & DO_SETLINK_MODIFIED) { 1993 if (status & DO_SETLINK_NOTIFY) 1994 netdev_state_change(dev); 1995 1996 if (err < 0) 1997 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", 1998 dev->name); 1999 } 2000 2001 return err; 2002 } 2003 2004 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2005 { 2006 struct net *net = sock_net(skb->sk); 2007 struct ifinfomsg *ifm; 2008 struct net_device *dev; 2009 int err; 2010 struct nlattr *tb[IFLA_MAX+1]; 2011 char ifname[IFNAMSIZ]; 2012 2013 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2014 if (err < 0) 2015 goto errout; 2016 2017 if (tb[IFLA_IFNAME]) 2018 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2019 else 2020 ifname[0] = '\0'; 2021 2022 err = -EINVAL; 2023 ifm = nlmsg_data(nlh); 2024 if (ifm->ifi_index > 0) 2025 dev = __dev_get_by_index(net, ifm->ifi_index); 2026 else if (tb[IFLA_IFNAME]) 2027 dev = __dev_get_by_name(net, ifname); 2028 else 2029 goto errout; 2030 2031 if (dev == NULL) { 2032 err = -ENODEV; 2033 goto errout; 2034 } 2035 2036 err = validate_linkmsg(dev, tb); 2037 if (err < 0) 2038 goto errout; 2039 2040 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 2041 errout: 2042 return err; 2043 } 2044 2045 static int rtnl_group_dellink(const struct net *net, int group) 2046 { 2047 struct net_device *dev, *aux; 2048 LIST_HEAD(list_kill); 2049 bool found = false; 2050 2051 if (!group) 2052 return -EPERM; 2053 2054 for_each_netdev(net, dev) { 2055 if (dev->group == group) { 2056 const struct rtnl_link_ops *ops; 2057 2058 found = true; 2059 ops = dev->rtnl_link_ops; 2060 if (!ops || !ops->dellink) 2061 return -EOPNOTSUPP; 2062 } 2063 } 2064 2065 if (!found) 2066 return -ENODEV; 2067 2068 for_each_netdev_safe(net, dev, aux) { 2069 if (dev->group == group) { 2070 const struct rtnl_link_ops *ops; 2071 2072 ops = dev->rtnl_link_ops; 2073 ops->dellink(dev, &list_kill); 2074 } 2075 } 2076 unregister_netdevice_many(&list_kill); 2077 2078 return 0; 2079 } 2080 2081 int rtnl_delete_link(struct net_device *dev) 2082 { 2083 const struct rtnl_link_ops *ops; 2084 LIST_HEAD(list_kill); 2085 2086 ops = dev->rtnl_link_ops; 2087 if (!ops || !ops->dellink) 2088 return -EOPNOTSUPP; 2089 2090 ops->dellink(dev, &list_kill); 2091 unregister_netdevice_many(&list_kill); 2092 2093 return 0; 2094 } 2095 EXPORT_SYMBOL_GPL(rtnl_delete_link); 2096 2097 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2098 { 2099 struct net *net = sock_net(skb->sk); 2100 struct net_device *dev; 2101 struct ifinfomsg *ifm; 2102 char ifname[IFNAMSIZ]; 2103 struct nlattr *tb[IFLA_MAX+1]; 2104 int err; 2105 2106 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2107 if (err < 0) 2108 return err; 2109 2110 if (tb[IFLA_IFNAME]) 2111 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2112 2113 ifm = nlmsg_data(nlh); 2114 if (ifm->ifi_index > 0) 2115 dev = __dev_get_by_index(net, ifm->ifi_index); 2116 else if (tb[IFLA_IFNAME]) 2117 dev = __dev_get_by_name(net, ifname); 2118 else if (tb[IFLA_GROUP]) 2119 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP])); 2120 else 2121 return -EINVAL; 2122 2123 if (!dev) 2124 return -ENODEV; 2125 2126 return rtnl_delete_link(dev); 2127 } 2128 2129 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 2130 { 2131 unsigned int old_flags; 2132 int err; 2133 2134 old_flags = dev->flags; 2135 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 2136 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 2137 if (err < 0) 2138 return err; 2139 } 2140 2141 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 2142 2143 __dev_notify_flags(dev, old_flags, ~0U); 2144 return 0; 2145 } 2146 EXPORT_SYMBOL(rtnl_configure_link); 2147 2148 struct net_device *rtnl_create_link(struct net *net, 2149 const char *ifname, unsigned char name_assign_type, 2150 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 2151 { 2152 int err; 2153 struct net_device *dev; 2154 unsigned int num_tx_queues = 1; 2155 unsigned int num_rx_queues = 1; 2156 2157 if (tb[IFLA_NUM_TX_QUEUES]) 2158 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 2159 else if (ops->get_num_tx_queues) 2160 num_tx_queues = ops->get_num_tx_queues(); 2161 2162 if (tb[IFLA_NUM_RX_QUEUES]) 2163 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 2164 else if (ops->get_num_rx_queues) 2165 num_rx_queues = ops->get_num_rx_queues(); 2166 2167 err = -ENOMEM; 2168 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 2169 ops->setup, num_tx_queues, num_rx_queues); 2170 if (!dev) 2171 goto err; 2172 2173 dev_net_set(dev, net); 2174 dev->rtnl_link_ops = ops; 2175 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 2176 2177 if (tb[IFLA_MTU]) 2178 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 2179 if (tb[IFLA_ADDRESS]) { 2180 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 2181 nla_len(tb[IFLA_ADDRESS])); 2182 dev->addr_assign_type = NET_ADDR_SET; 2183 } 2184 if (tb[IFLA_BROADCAST]) 2185 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 2186 nla_len(tb[IFLA_BROADCAST])); 2187 if (tb[IFLA_TXQLEN]) 2188 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 2189 if (tb[IFLA_OPERSTATE]) 2190 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 2191 if (tb[IFLA_LINKMODE]) 2192 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 2193 if (tb[IFLA_GROUP]) 2194 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 2195 2196 return dev; 2197 2198 err: 2199 return ERR_PTR(err); 2200 } 2201 EXPORT_SYMBOL(rtnl_create_link); 2202 2203 static int rtnl_group_changelink(const struct sk_buff *skb, 2204 struct net *net, int group, 2205 struct ifinfomsg *ifm, 2206 struct nlattr **tb) 2207 { 2208 struct net_device *dev, *aux; 2209 int err; 2210 2211 for_each_netdev_safe(net, dev, aux) { 2212 if (dev->group == group) { 2213 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 2214 if (err < 0) 2215 return err; 2216 } 2217 } 2218 2219 return 0; 2220 } 2221 2222 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2223 { 2224 struct net *net = sock_net(skb->sk); 2225 const struct rtnl_link_ops *ops; 2226 const struct rtnl_link_ops *m_ops = NULL; 2227 struct net_device *dev; 2228 struct net_device *master_dev = NULL; 2229 struct ifinfomsg *ifm; 2230 char kind[MODULE_NAME_LEN]; 2231 char ifname[IFNAMSIZ]; 2232 struct nlattr *tb[IFLA_MAX+1]; 2233 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 2234 unsigned char name_assign_type = NET_NAME_USER; 2235 int err; 2236 2237 #ifdef CONFIG_MODULES 2238 replay: 2239 #endif 2240 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2241 if (err < 0) 2242 return err; 2243 2244 if (tb[IFLA_IFNAME]) 2245 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2246 else 2247 ifname[0] = '\0'; 2248 2249 ifm = nlmsg_data(nlh); 2250 if (ifm->ifi_index > 0) 2251 dev = __dev_get_by_index(net, ifm->ifi_index); 2252 else { 2253 if (ifname[0]) 2254 dev = __dev_get_by_name(net, ifname); 2255 else 2256 dev = NULL; 2257 } 2258 2259 if (dev) { 2260 master_dev = netdev_master_upper_dev_get(dev); 2261 if (master_dev) 2262 m_ops = master_dev->rtnl_link_ops; 2263 } 2264 2265 err = validate_linkmsg(dev, tb); 2266 if (err < 0) 2267 return err; 2268 2269 if (tb[IFLA_LINKINFO]) { 2270 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 2271 tb[IFLA_LINKINFO], ifla_info_policy); 2272 if (err < 0) 2273 return err; 2274 } else 2275 memset(linkinfo, 0, sizeof(linkinfo)); 2276 2277 if (linkinfo[IFLA_INFO_KIND]) { 2278 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 2279 ops = rtnl_link_ops_get(kind); 2280 } else { 2281 kind[0] = '\0'; 2282 ops = NULL; 2283 } 2284 2285 if (1) { 2286 struct nlattr *attr[ops ? ops->maxtype + 1 : 1]; 2287 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1]; 2288 struct nlattr **data = NULL; 2289 struct nlattr **slave_data = NULL; 2290 struct net *dest_net, *link_net = NULL; 2291 2292 if (ops) { 2293 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 2294 err = nla_parse_nested(attr, ops->maxtype, 2295 linkinfo[IFLA_INFO_DATA], 2296 ops->policy); 2297 if (err < 0) 2298 return err; 2299 data = attr; 2300 } 2301 if (ops->validate) { 2302 err = ops->validate(tb, data); 2303 if (err < 0) 2304 return err; 2305 } 2306 } 2307 2308 if (m_ops) { 2309 if (m_ops->slave_maxtype && 2310 linkinfo[IFLA_INFO_SLAVE_DATA]) { 2311 err = nla_parse_nested(slave_attr, 2312 m_ops->slave_maxtype, 2313 linkinfo[IFLA_INFO_SLAVE_DATA], 2314 m_ops->slave_policy); 2315 if (err < 0) 2316 return err; 2317 slave_data = slave_attr; 2318 } 2319 if (m_ops->slave_validate) { 2320 err = m_ops->slave_validate(tb, slave_data); 2321 if (err < 0) 2322 return err; 2323 } 2324 } 2325 2326 if (dev) { 2327 int status = 0; 2328 2329 if (nlh->nlmsg_flags & NLM_F_EXCL) 2330 return -EEXIST; 2331 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2332 return -EOPNOTSUPP; 2333 2334 if (linkinfo[IFLA_INFO_DATA]) { 2335 if (!ops || ops != dev->rtnl_link_ops || 2336 !ops->changelink) 2337 return -EOPNOTSUPP; 2338 2339 err = ops->changelink(dev, tb, data); 2340 if (err < 0) 2341 return err; 2342 status |= DO_SETLINK_NOTIFY; 2343 } 2344 2345 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2346 if (!m_ops || !m_ops->slave_changelink) 2347 return -EOPNOTSUPP; 2348 2349 err = m_ops->slave_changelink(master_dev, dev, 2350 tb, slave_data); 2351 if (err < 0) 2352 return err; 2353 status |= DO_SETLINK_NOTIFY; 2354 } 2355 2356 return do_setlink(skb, dev, ifm, tb, ifname, status); 2357 } 2358 2359 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2360 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2361 return rtnl_group_changelink(skb, net, 2362 nla_get_u32(tb[IFLA_GROUP]), 2363 ifm, tb); 2364 return -ENODEV; 2365 } 2366 2367 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2368 return -EOPNOTSUPP; 2369 2370 if (!ops) { 2371 #ifdef CONFIG_MODULES 2372 if (kind[0]) { 2373 __rtnl_unlock(); 2374 request_module("rtnl-link-%s", kind); 2375 rtnl_lock(); 2376 ops = rtnl_link_ops_get(kind); 2377 if (ops) 2378 goto replay; 2379 } 2380 #endif 2381 return -EOPNOTSUPP; 2382 } 2383 2384 if (!ops->setup) 2385 return -EOPNOTSUPP; 2386 2387 if (!ifname[0]) { 2388 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2389 name_assign_type = NET_NAME_ENUM; 2390 } 2391 2392 dest_net = rtnl_link_get_net(net, tb); 2393 if (IS_ERR(dest_net)) 2394 return PTR_ERR(dest_net); 2395 2396 err = -EPERM; 2397 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN)) 2398 goto out; 2399 2400 if (tb[IFLA_LINK_NETNSID]) { 2401 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]); 2402 2403 link_net = get_net_ns_by_id(dest_net, id); 2404 if (!link_net) { 2405 err = -EINVAL; 2406 goto out; 2407 } 2408 err = -EPERM; 2409 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN)) 2410 goto out; 2411 } 2412 2413 dev = rtnl_create_link(link_net ? : dest_net, ifname, 2414 name_assign_type, ops, tb); 2415 if (IS_ERR(dev)) { 2416 err = PTR_ERR(dev); 2417 goto out; 2418 } 2419 2420 dev->ifindex = ifm->ifi_index; 2421 2422 if (ops->newlink) { 2423 err = ops->newlink(link_net ? : net, dev, tb, data); 2424 /* Drivers should call free_netdev() in ->destructor 2425 * and unregister it on failure after registration 2426 * so that device could be finally freed in rtnl_unlock. 2427 */ 2428 if (err < 0) { 2429 /* If device is not registered at all, free it now */ 2430 if (dev->reg_state == NETREG_UNINITIALIZED) 2431 free_netdev(dev); 2432 goto out; 2433 } 2434 } else { 2435 err = register_netdevice(dev); 2436 if (err < 0) { 2437 free_netdev(dev); 2438 goto out; 2439 } 2440 } 2441 err = rtnl_configure_link(dev, ifm); 2442 if (err < 0) 2443 goto out_unregister; 2444 if (link_net) { 2445 err = dev_change_net_namespace(dev, dest_net, ifname); 2446 if (err < 0) 2447 goto out_unregister; 2448 } 2449 out: 2450 if (link_net) 2451 put_net(link_net); 2452 put_net(dest_net); 2453 return err; 2454 out_unregister: 2455 if (ops->newlink) { 2456 LIST_HEAD(list_kill); 2457 2458 ops->dellink(dev, &list_kill); 2459 unregister_netdevice_many(&list_kill); 2460 } else { 2461 unregister_netdevice(dev); 2462 } 2463 goto out; 2464 } 2465 } 2466 2467 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2468 { 2469 struct net *net = sock_net(skb->sk); 2470 struct ifinfomsg *ifm; 2471 char ifname[IFNAMSIZ]; 2472 struct nlattr *tb[IFLA_MAX+1]; 2473 struct net_device *dev = NULL; 2474 struct sk_buff *nskb; 2475 int err; 2476 u32 ext_filter_mask = 0; 2477 2478 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2479 if (err < 0) 2480 return err; 2481 2482 if (tb[IFLA_IFNAME]) 2483 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2484 2485 if (tb[IFLA_EXT_MASK]) 2486 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2487 2488 ifm = nlmsg_data(nlh); 2489 if (ifm->ifi_index > 0) 2490 dev = __dev_get_by_index(net, ifm->ifi_index); 2491 else if (tb[IFLA_IFNAME]) 2492 dev = __dev_get_by_name(net, ifname); 2493 else 2494 return -EINVAL; 2495 2496 if (dev == NULL) 2497 return -ENODEV; 2498 2499 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2500 if (nskb == NULL) 2501 return -ENOBUFS; 2502 2503 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2504 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2505 if (err < 0) { 2506 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2507 WARN_ON(err == -EMSGSIZE); 2508 kfree_skb(nskb); 2509 } else 2510 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2511 2512 return err; 2513 } 2514 2515 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2516 { 2517 struct net *net = sock_net(skb->sk); 2518 struct net_device *dev; 2519 struct nlattr *tb[IFLA_MAX+1]; 2520 u32 ext_filter_mask = 0; 2521 u16 min_ifinfo_dump_size = 0; 2522 int hdrlen; 2523 2524 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2525 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2526 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2527 2528 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2529 if (tb[IFLA_EXT_MASK]) 2530 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2531 } 2532 2533 if (!ext_filter_mask) 2534 return NLMSG_GOODSIZE; 2535 /* 2536 * traverse the list of net devices and compute the minimum 2537 * buffer size based upon the filter mask. 2538 */ 2539 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2540 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2541 if_nlmsg_size(dev, 2542 ext_filter_mask)); 2543 } 2544 2545 return min_ifinfo_dump_size; 2546 } 2547 2548 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2549 { 2550 int idx; 2551 int s_idx = cb->family; 2552 2553 if (s_idx == 0) 2554 s_idx = 1; 2555 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2556 int type = cb->nlh->nlmsg_type-RTM_BASE; 2557 if (idx < s_idx || idx == PF_PACKET) 2558 continue; 2559 if (rtnl_msg_handlers[idx] == NULL || 2560 rtnl_msg_handlers[idx][type].dumpit == NULL) 2561 continue; 2562 if (idx > s_idx) { 2563 memset(&cb->args[0], 0, sizeof(cb->args)); 2564 cb->prev_seq = 0; 2565 cb->seq = 0; 2566 } 2567 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2568 break; 2569 } 2570 cb->family = idx; 2571 2572 return skb->len; 2573 } 2574 2575 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 2576 unsigned int change, gfp_t flags) 2577 { 2578 struct net *net = dev_net(dev); 2579 struct sk_buff *skb; 2580 int err = -ENOBUFS; 2581 size_t if_info_size; 2582 2583 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2584 if (skb == NULL) 2585 goto errout; 2586 2587 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2588 if (err < 0) { 2589 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2590 WARN_ON(err == -EMSGSIZE); 2591 kfree_skb(skb); 2592 goto errout; 2593 } 2594 return skb; 2595 errout: 2596 if (err < 0) 2597 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2598 return NULL; 2599 } 2600 2601 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 2602 { 2603 struct net *net = dev_net(dev); 2604 2605 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2606 } 2607 2608 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2609 gfp_t flags) 2610 { 2611 struct sk_buff *skb; 2612 2613 if (dev->reg_state != NETREG_REGISTERED) 2614 return; 2615 2616 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags); 2617 if (skb) 2618 rtmsg_ifinfo_send(skb, dev, flags); 2619 } 2620 EXPORT_SYMBOL(rtmsg_ifinfo); 2621 2622 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2623 struct net_device *dev, 2624 u8 *addr, u16 vid, u32 pid, u32 seq, 2625 int type, unsigned int flags, 2626 int nlflags, u16 ndm_state) 2627 { 2628 struct nlmsghdr *nlh; 2629 struct ndmsg *ndm; 2630 2631 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2632 if (!nlh) 2633 return -EMSGSIZE; 2634 2635 ndm = nlmsg_data(nlh); 2636 ndm->ndm_family = AF_BRIDGE; 2637 ndm->ndm_pad1 = 0; 2638 ndm->ndm_pad2 = 0; 2639 ndm->ndm_flags = flags; 2640 ndm->ndm_type = 0; 2641 ndm->ndm_ifindex = dev->ifindex; 2642 ndm->ndm_state = ndm_state; 2643 2644 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2645 goto nla_put_failure; 2646 if (vid) 2647 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid)) 2648 goto nla_put_failure; 2649 2650 nlmsg_end(skb, nlh); 2651 return 0; 2652 2653 nla_put_failure: 2654 nlmsg_cancel(skb, nlh); 2655 return -EMSGSIZE; 2656 } 2657 2658 static inline size_t rtnl_fdb_nlmsg_size(void) 2659 { 2660 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2661 } 2662 2663 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type, 2664 u16 ndm_state) 2665 { 2666 struct net *net = dev_net(dev); 2667 struct sk_buff *skb; 2668 int err = -ENOBUFS; 2669 2670 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2671 if (!skb) 2672 goto errout; 2673 2674 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid, 2675 0, 0, type, NTF_SELF, 0, ndm_state); 2676 if (err < 0) { 2677 kfree_skb(skb); 2678 goto errout; 2679 } 2680 2681 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2682 return; 2683 errout: 2684 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2685 } 2686 2687 /** 2688 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2689 */ 2690 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2691 struct nlattr *tb[], 2692 struct net_device *dev, 2693 const unsigned char *addr, u16 vid, 2694 u16 flags) 2695 { 2696 int err = -EINVAL; 2697 2698 /* If aging addresses are supported device will need to 2699 * implement its own handler for this. 2700 */ 2701 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2702 pr_info("%s: FDB only supports static addresses\n", dev->name); 2703 return err; 2704 } 2705 2706 if (vid) { 2707 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name); 2708 return err; 2709 } 2710 2711 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2712 err = dev_uc_add_excl(dev, addr); 2713 else if (is_multicast_ether_addr(addr)) 2714 err = dev_mc_add_excl(dev, addr); 2715 2716 /* Only return duplicate errors if NLM_F_EXCL is set */ 2717 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2718 err = 0; 2719 2720 return err; 2721 } 2722 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2723 2724 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid) 2725 { 2726 u16 vid = 0; 2727 2728 if (vlan_attr) { 2729 if (nla_len(vlan_attr) != sizeof(u16)) { 2730 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n"); 2731 return -EINVAL; 2732 } 2733 2734 vid = nla_get_u16(vlan_attr); 2735 2736 if (!vid || vid >= VLAN_VID_MASK) { 2737 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n", 2738 vid); 2739 return -EINVAL; 2740 } 2741 } 2742 *p_vid = vid; 2743 return 0; 2744 } 2745 2746 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2747 { 2748 struct net *net = sock_net(skb->sk); 2749 struct ndmsg *ndm; 2750 struct nlattr *tb[NDA_MAX+1]; 2751 struct net_device *dev; 2752 u8 *addr; 2753 u16 vid; 2754 int err; 2755 2756 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2757 if (err < 0) 2758 return err; 2759 2760 ndm = nlmsg_data(nlh); 2761 if (ndm->ndm_ifindex == 0) { 2762 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2763 return -EINVAL; 2764 } 2765 2766 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2767 if (dev == NULL) { 2768 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2769 return -ENODEV; 2770 } 2771 2772 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2773 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2774 return -EINVAL; 2775 } 2776 2777 addr = nla_data(tb[NDA_LLADDR]); 2778 2779 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2780 if (err) 2781 return err; 2782 2783 err = -EOPNOTSUPP; 2784 2785 /* Support fdb on master device the net/bridge default case */ 2786 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2787 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2788 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2789 const struct net_device_ops *ops = br_dev->netdev_ops; 2790 2791 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid, 2792 nlh->nlmsg_flags); 2793 if (err) 2794 goto out; 2795 else 2796 ndm->ndm_flags &= ~NTF_MASTER; 2797 } 2798 2799 /* Embedded bridge, macvlan, and any other device support */ 2800 if ((ndm->ndm_flags & NTF_SELF)) { 2801 if (dev->netdev_ops->ndo_fdb_add) 2802 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2803 vid, 2804 nlh->nlmsg_flags); 2805 else 2806 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, 2807 nlh->nlmsg_flags); 2808 2809 if (!err) { 2810 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH, 2811 ndm->ndm_state); 2812 ndm->ndm_flags &= ~NTF_SELF; 2813 } 2814 } 2815 out: 2816 return err; 2817 } 2818 2819 /** 2820 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2821 */ 2822 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2823 struct nlattr *tb[], 2824 struct net_device *dev, 2825 const unsigned char *addr, u16 vid) 2826 { 2827 int err = -EINVAL; 2828 2829 /* If aging addresses are supported device will need to 2830 * implement its own handler for this. 2831 */ 2832 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2833 pr_info("%s: FDB only supports static addresses\n", dev->name); 2834 return err; 2835 } 2836 2837 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2838 err = dev_uc_del(dev, addr); 2839 else if (is_multicast_ether_addr(addr)) 2840 err = dev_mc_del(dev, addr); 2841 2842 return err; 2843 } 2844 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2845 2846 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2847 { 2848 struct net *net = sock_net(skb->sk); 2849 struct ndmsg *ndm; 2850 struct nlattr *tb[NDA_MAX+1]; 2851 struct net_device *dev; 2852 int err = -EINVAL; 2853 __u8 *addr; 2854 u16 vid; 2855 2856 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2857 return -EPERM; 2858 2859 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2860 if (err < 0) 2861 return err; 2862 2863 ndm = nlmsg_data(nlh); 2864 if (ndm->ndm_ifindex == 0) { 2865 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2866 return -EINVAL; 2867 } 2868 2869 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2870 if (dev == NULL) { 2871 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2872 return -ENODEV; 2873 } 2874 2875 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2876 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2877 return -EINVAL; 2878 } 2879 2880 addr = nla_data(tb[NDA_LLADDR]); 2881 2882 err = fdb_vid_parse(tb[NDA_VLAN], &vid); 2883 if (err) 2884 return err; 2885 2886 err = -EOPNOTSUPP; 2887 2888 /* Support fdb on master device the net/bridge default case */ 2889 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2890 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2891 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2892 const struct net_device_ops *ops = br_dev->netdev_ops; 2893 2894 if (ops->ndo_fdb_del) 2895 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid); 2896 2897 if (err) 2898 goto out; 2899 else 2900 ndm->ndm_flags &= ~NTF_MASTER; 2901 } 2902 2903 /* Embedded bridge, macvlan, and any other device support */ 2904 if (ndm->ndm_flags & NTF_SELF) { 2905 if (dev->netdev_ops->ndo_fdb_del) 2906 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr, 2907 vid); 2908 else 2909 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid); 2910 2911 if (!err) { 2912 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH, 2913 ndm->ndm_state); 2914 ndm->ndm_flags &= ~NTF_SELF; 2915 } 2916 } 2917 out: 2918 return err; 2919 } 2920 2921 static int nlmsg_populate_fdb(struct sk_buff *skb, 2922 struct netlink_callback *cb, 2923 struct net_device *dev, 2924 int *idx, 2925 struct netdev_hw_addr_list *list) 2926 { 2927 struct netdev_hw_addr *ha; 2928 int err; 2929 u32 portid, seq; 2930 2931 portid = NETLINK_CB(cb->skb).portid; 2932 seq = cb->nlh->nlmsg_seq; 2933 2934 list_for_each_entry(ha, &list->list, list) { 2935 if (*idx < cb->args[0]) 2936 goto skip; 2937 2938 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0, 2939 portid, seq, 2940 RTM_NEWNEIGH, NTF_SELF, 2941 NLM_F_MULTI, NUD_PERMANENT); 2942 if (err < 0) 2943 return err; 2944 skip: 2945 *idx += 1; 2946 } 2947 return 0; 2948 } 2949 2950 /** 2951 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2952 * @nlh: netlink message header 2953 * @dev: netdevice 2954 * 2955 * Default netdevice operation to dump the existing unicast address list. 2956 * Returns number of addresses from list put in skb. 2957 */ 2958 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2959 struct netlink_callback *cb, 2960 struct net_device *dev, 2961 struct net_device *filter_dev, 2962 int idx) 2963 { 2964 int err; 2965 2966 netif_addr_lock_bh(dev); 2967 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2968 if (err) 2969 goto out; 2970 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2971 out: 2972 netif_addr_unlock_bh(dev); 2973 cb->args[1] = err; 2974 return idx; 2975 } 2976 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2977 2978 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2979 { 2980 struct net_device *dev; 2981 struct nlattr *tb[IFLA_MAX+1]; 2982 struct net_device *br_dev = NULL; 2983 const struct net_device_ops *ops = NULL; 2984 const struct net_device_ops *cops = NULL; 2985 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2986 struct net *net = sock_net(skb->sk); 2987 int brport_idx = 0; 2988 int br_idx = 0; 2989 int idx = 0; 2990 2991 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 2992 ifla_policy) == 0) { 2993 if (tb[IFLA_MASTER]) 2994 br_idx = nla_get_u32(tb[IFLA_MASTER]); 2995 } 2996 2997 brport_idx = ifm->ifi_index; 2998 2999 if (br_idx) { 3000 br_dev = __dev_get_by_index(net, br_idx); 3001 if (!br_dev) 3002 return -ENODEV; 3003 3004 ops = br_dev->netdev_ops; 3005 } 3006 3007 cb->args[1] = 0; 3008 for_each_netdev(net, dev) { 3009 if (brport_idx && (dev->ifindex != brport_idx)) 3010 continue; 3011 3012 if (!br_idx) { /* user did not specify a specific bridge */ 3013 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3014 br_dev = netdev_master_upper_dev_get(dev); 3015 cops = br_dev->netdev_ops; 3016 } 3017 3018 } else { 3019 if (dev != br_dev && 3020 !(dev->priv_flags & IFF_BRIDGE_PORT)) 3021 continue; 3022 3023 if (br_dev != netdev_master_upper_dev_get(dev) && 3024 !(dev->priv_flags & IFF_EBRIDGE)) 3025 continue; 3026 3027 cops = ops; 3028 } 3029 3030 if (dev->priv_flags & IFF_BRIDGE_PORT) { 3031 if (cops && cops->ndo_fdb_dump) 3032 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 3033 idx); 3034 } 3035 if (cb->args[1] == -EMSGSIZE) 3036 break; 3037 3038 if (dev->netdev_ops->ndo_fdb_dump) 3039 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL, 3040 idx); 3041 else 3042 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 3043 if (cb->args[1] == -EMSGSIZE) 3044 break; 3045 3046 cops = NULL; 3047 } 3048 3049 cb->args[0] = idx; 3050 return skb->len; 3051 } 3052 3053 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask, 3054 unsigned int attrnum, unsigned int flag) 3055 { 3056 if (mask & flag) 3057 return nla_put_u8(skb, attrnum, !!(flags & flag)); 3058 return 0; 3059 } 3060 3061 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 3062 struct net_device *dev, u16 mode, 3063 u32 flags, u32 mask, int nlflags, 3064 u32 filter_mask, 3065 int (*vlan_fill)(struct sk_buff *skb, 3066 struct net_device *dev, 3067 u32 filter_mask)) 3068 { 3069 struct nlmsghdr *nlh; 3070 struct ifinfomsg *ifm; 3071 struct nlattr *br_afspec; 3072 struct nlattr *protinfo; 3073 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 3074 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3075 int err = 0; 3076 3077 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags); 3078 if (nlh == NULL) 3079 return -EMSGSIZE; 3080 3081 ifm = nlmsg_data(nlh); 3082 ifm->ifi_family = AF_BRIDGE; 3083 ifm->__ifi_pad = 0; 3084 ifm->ifi_type = dev->type; 3085 ifm->ifi_index = dev->ifindex; 3086 ifm->ifi_flags = dev_get_flags(dev); 3087 ifm->ifi_change = 0; 3088 3089 3090 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 3091 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 3092 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 3093 (br_dev && 3094 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 3095 (dev->addr_len && 3096 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 3097 (dev->ifindex != dev_get_iflink(dev) && 3098 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 3099 goto nla_put_failure; 3100 3101 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 3102 if (!br_afspec) 3103 goto nla_put_failure; 3104 3105 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) { 3106 nla_nest_cancel(skb, br_afspec); 3107 goto nla_put_failure; 3108 } 3109 3110 if (mode != BRIDGE_MODE_UNDEF) { 3111 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 3112 nla_nest_cancel(skb, br_afspec); 3113 goto nla_put_failure; 3114 } 3115 } 3116 if (vlan_fill) { 3117 err = vlan_fill(skb, dev, filter_mask); 3118 if (err) { 3119 nla_nest_cancel(skb, br_afspec); 3120 goto nla_put_failure; 3121 } 3122 } 3123 nla_nest_end(skb, br_afspec); 3124 3125 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 3126 if (!protinfo) 3127 goto nla_put_failure; 3128 3129 if (brport_nla_put_flag(skb, flags, mask, 3130 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) || 3131 brport_nla_put_flag(skb, flags, mask, 3132 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) || 3133 brport_nla_put_flag(skb, flags, mask, 3134 IFLA_BRPORT_FAST_LEAVE, 3135 BR_MULTICAST_FAST_LEAVE) || 3136 brport_nla_put_flag(skb, flags, mask, 3137 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) || 3138 brport_nla_put_flag(skb, flags, mask, 3139 IFLA_BRPORT_LEARNING, BR_LEARNING) || 3140 brport_nla_put_flag(skb, flags, mask, 3141 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) || 3142 brport_nla_put_flag(skb, flags, mask, 3143 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) || 3144 brport_nla_put_flag(skb, flags, mask, 3145 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) { 3146 nla_nest_cancel(skb, protinfo); 3147 goto nla_put_failure; 3148 } 3149 3150 nla_nest_end(skb, protinfo); 3151 3152 nlmsg_end(skb, nlh); 3153 return 0; 3154 nla_put_failure: 3155 nlmsg_cancel(skb, nlh); 3156 return err ? err : -EMSGSIZE; 3157 } 3158 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink); 3159 3160 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 3161 { 3162 struct net *net = sock_net(skb->sk); 3163 struct net_device *dev; 3164 int idx = 0; 3165 u32 portid = NETLINK_CB(cb->skb).portid; 3166 u32 seq = cb->nlh->nlmsg_seq; 3167 u32 filter_mask = 0; 3168 int err; 3169 3170 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 3171 struct nlattr *extfilt; 3172 3173 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 3174 IFLA_EXT_MASK); 3175 if (extfilt) { 3176 if (nla_len(extfilt) < sizeof(filter_mask)) 3177 return -EINVAL; 3178 3179 filter_mask = nla_get_u32(extfilt); 3180 } 3181 } 3182 3183 rcu_read_lock(); 3184 for_each_netdev_rcu(net, dev) { 3185 const struct net_device_ops *ops = dev->netdev_ops; 3186 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3187 3188 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 3189 if (idx >= cb->args[0]) { 3190 err = br_dev->netdev_ops->ndo_bridge_getlink( 3191 skb, portid, seq, dev, 3192 filter_mask, NLM_F_MULTI); 3193 if (err < 0 && err != -EOPNOTSUPP) 3194 break; 3195 } 3196 idx++; 3197 } 3198 3199 if (ops->ndo_bridge_getlink) { 3200 if (idx >= cb->args[0]) { 3201 err = ops->ndo_bridge_getlink(skb, portid, 3202 seq, dev, 3203 filter_mask, 3204 NLM_F_MULTI); 3205 if (err < 0 && err != -EOPNOTSUPP) 3206 break; 3207 } 3208 idx++; 3209 } 3210 } 3211 rcu_read_unlock(); 3212 cb->args[0] = idx; 3213 3214 return skb->len; 3215 } 3216 3217 static inline size_t bridge_nlmsg_size(void) 3218 { 3219 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3220 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3221 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3222 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 3223 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 3224 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 3225 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 3226 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 3227 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 3228 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 3229 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 3230 } 3231 3232 static int rtnl_bridge_notify(struct net_device *dev) 3233 { 3234 struct net *net = dev_net(dev); 3235 struct sk_buff *skb; 3236 int err = -EOPNOTSUPP; 3237 3238 if (!dev->netdev_ops->ndo_bridge_getlink) 3239 return 0; 3240 3241 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 3242 if (!skb) { 3243 err = -ENOMEM; 3244 goto errout; 3245 } 3246 3247 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0); 3248 if (err < 0) 3249 goto errout; 3250 3251 if (!skb->len) 3252 goto errout; 3253 3254 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 3255 return 0; 3256 errout: 3257 WARN_ON(err == -EMSGSIZE); 3258 kfree_skb(skb); 3259 if (err) 3260 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 3261 return err; 3262 } 3263 3264 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 3265 { 3266 struct net *net = sock_net(skb->sk); 3267 struct ifinfomsg *ifm; 3268 struct net_device *dev; 3269 struct nlattr *br_spec, *attr = NULL; 3270 int rem, err = -EOPNOTSUPP; 3271 u16 flags = 0; 3272 bool have_flags = false; 3273 3274 if (nlmsg_len(nlh) < sizeof(*ifm)) 3275 return -EINVAL; 3276 3277 ifm = nlmsg_data(nlh); 3278 if (ifm->ifi_family != AF_BRIDGE) 3279 return -EPFNOSUPPORT; 3280 3281 dev = __dev_get_by_index(net, ifm->ifi_index); 3282 if (!dev) { 3283 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3284 return -ENODEV; 3285 } 3286 3287 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3288 if (br_spec) { 3289 nla_for_each_nested(attr, br_spec, rem) { 3290 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3291 if (nla_len(attr) < sizeof(flags)) 3292 return -EINVAL; 3293 3294 have_flags = true; 3295 flags = nla_get_u16(attr); 3296 break; 3297 } 3298 } 3299 } 3300 3301 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3302 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3303 3304 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 3305 err = -EOPNOTSUPP; 3306 goto out; 3307 } 3308 3309 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags); 3310 if (err) 3311 goto out; 3312 3313 flags &= ~BRIDGE_FLAGS_MASTER; 3314 } 3315 3316 if ((flags & BRIDGE_FLAGS_SELF)) { 3317 if (!dev->netdev_ops->ndo_bridge_setlink) 3318 err = -EOPNOTSUPP; 3319 else 3320 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, 3321 flags); 3322 if (!err) { 3323 flags &= ~BRIDGE_FLAGS_SELF; 3324 3325 /* Generate event to notify upper layer of bridge 3326 * change 3327 */ 3328 err = rtnl_bridge_notify(dev); 3329 } 3330 } 3331 3332 if (have_flags) 3333 memcpy(nla_data(attr), &flags, sizeof(flags)); 3334 out: 3335 return err; 3336 } 3337 3338 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 3339 { 3340 struct net *net = sock_net(skb->sk); 3341 struct ifinfomsg *ifm; 3342 struct net_device *dev; 3343 struct nlattr *br_spec, *attr = NULL; 3344 int rem, err = -EOPNOTSUPP; 3345 u16 flags = 0; 3346 bool have_flags = false; 3347 3348 if (nlmsg_len(nlh) < sizeof(*ifm)) 3349 return -EINVAL; 3350 3351 ifm = nlmsg_data(nlh); 3352 if (ifm->ifi_family != AF_BRIDGE) 3353 return -EPFNOSUPPORT; 3354 3355 dev = __dev_get_by_index(net, ifm->ifi_index); 3356 if (!dev) { 3357 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 3358 return -ENODEV; 3359 } 3360 3361 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 3362 if (br_spec) { 3363 nla_for_each_nested(attr, br_spec, rem) { 3364 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 3365 if (nla_len(attr) < sizeof(flags)) 3366 return -EINVAL; 3367 3368 have_flags = true; 3369 flags = nla_get_u16(attr); 3370 break; 3371 } 3372 } 3373 } 3374 3375 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 3376 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 3377 3378 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 3379 err = -EOPNOTSUPP; 3380 goto out; 3381 } 3382 3383 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags); 3384 if (err) 3385 goto out; 3386 3387 flags &= ~BRIDGE_FLAGS_MASTER; 3388 } 3389 3390 if ((flags & BRIDGE_FLAGS_SELF)) { 3391 if (!dev->netdev_ops->ndo_bridge_dellink) 3392 err = -EOPNOTSUPP; 3393 else 3394 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, 3395 flags); 3396 3397 if (!err) { 3398 flags &= ~BRIDGE_FLAGS_SELF; 3399 3400 /* Generate event to notify upper layer of bridge 3401 * change 3402 */ 3403 err = rtnl_bridge_notify(dev); 3404 } 3405 } 3406 3407 if (have_flags) 3408 memcpy(nla_data(attr), &flags, sizeof(flags)); 3409 out: 3410 return err; 3411 } 3412 3413 /* Process one rtnetlink message. */ 3414 3415 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 3416 { 3417 struct net *net = sock_net(skb->sk); 3418 rtnl_doit_func doit; 3419 int kind; 3420 int family; 3421 int type; 3422 int err; 3423 3424 type = nlh->nlmsg_type; 3425 if (type > RTM_MAX) 3426 return -EOPNOTSUPP; 3427 3428 type -= RTM_BASE; 3429 3430 /* All the messages must have at least 1 byte length */ 3431 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 3432 return 0; 3433 3434 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 3435 kind = type&3; 3436 3437 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 3438 return -EPERM; 3439 3440 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 3441 struct sock *rtnl; 3442 rtnl_dumpit_func dumpit; 3443 rtnl_calcit_func calcit; 3444 u16 min_dump_alloc = 0; 3445 3446 dumpit = rtnl_get_dumpit(family, type); 3447 if (dumpit == NULL) 3448 return -EOPNOTSUPP; 3449 calcit = rtnl_get_calcit(family, type); 3450 if (calcit) 3451 min_dump_alloc = calcit(skb, nlh); 3452 3453 __rtnl_unlock(); 3454 rtnl = net->rtnl; 3455 { 3456 struct netlink_dump_control c = { 3457 .dump = dumpit, 3458 .min_dump_alloc = min_dump_alloc, 3459 }; 3460 err = netlink_dump_start(rtnl, skb, nlh, &c); 3461 } 3462 rtnl_lock(); 3463 return err; 3464 } 3465 3466 doit = rtnl_get_doit(family, type); 3467 if (doit == NULL) 3468 return -EOPNOTSUPP; 3469 3470 return doit(skb, nlh); 3471 } 3472 3473 static void rtnetlink_rcv(struct sk_buff *skb) 3474 { 3475 rtnl_lock(); 3476 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 3477 rtnl_unlock(); 3478 } 3479 3480 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 3481 { 3482 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3483 3484 switch (event) { 3485 case NETDEV_UP: 3486 case NETDEV_DOWN: 3487 case NETDEV_PRE_UP: 3488 case NETDEV_POST_INIT: 3489 case NETDEV_REGISTER: 3490 case NETDEV_CHANGE: 3491 case NETDEV_PRE_TYPE_CHANGE: 3492 case NETDEV_GOING_DOWN: 3493 case NETDEV_UNREGISTER: 3494 case NETDEV_UNREGISTER_FINAL: 3495 case NETDEV_RELEASE: 3496 case NETDEV_JOIN: 3497 case NETDEV_BONDING_INFO: 3498 break; 3499 default: 3500 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3501 break; 3502 } 3503 return NOTIFY_DONE; 3504 } 3505 3506 static struct notifier_block rtnetlink_dev_notifier = { 3507 .notifier_call = rtnetlink_event, 3508 }; 3509 3510 3511 static int __net_init rtnetlink_net_init(struct net *net) 3512 { 3513 struct sock *sk; 3514 struct netlink_kernel_cfg cfg = { 3515 .groups = RTNLGRP_MAX, 3516 .input = rtnetlink_rcv, 3517 .cb_mutex = &rtnl_mutex, 3518 .flags = NL_CFG_F_NONROOT_RECV, 3519 }; 3520 3521 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3522 if (!sk) 3523 return -ENOMEM; 3524 net->rtnl = sk; 3525 return 0; 3526 } 3527 3528 static void __net_exit rtnetlink_net_exit(struct net *net) 3529 { 3530 netlink_kernel_release(net->rtnl); 3531 net->rtnl = NULL; 3532 } 3533 3534 static struct pernet_operations rtnetlink_net_ops = { 3535 .init = rtnetlink_net_init, 3536 .exit = rtnetlink_net_exit, 3537 }; 3538 3539 void __init rtnetlink_init(void) 3540 { 3541 if (register_pernet_subsys(&rtnetlink_net_ops)) 3542 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3543 3544 register_netdevice_notifier(&rtnetlink_dev_notifier); 3545 3546 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3547 rtnl_dump_ifinfo, rtnl_calcit); 3548 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3549 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3550 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3551 3552 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3553 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3554 3555 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3556 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3557 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3558 3559 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3560 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3561 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3562 } 3563