1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/slab.h> 31 #include <linux/interrupt.h> 32 #include <linux/capability.h> 33 #include <linux/skbuff.h> 34 #include <linux/init.h> 35 #include <linux/security.h> 36 #include <linux/mutex.h> 37 #include <linux/if_addr.h> 38 #include <linux/if_bridge.h> 39 #include <linux/pci.h> 40 #include <linux/etherdevice.h> 41 42 #include <asm/uaccess.h> 43 44 #include <linux/inet.h> 45 #include <linux/netdevice.h> 46 #include <net/ip.h> 47 #include <net/protocol.h> 48 #include <net/arp.h> 49 #include <net/route.h> 50 #include <net/udp.h> 51 #include <net/sock.h> 52 #include <net/pkt_sched.h> 53 #include <net/fib_rules.h> 54 #include <net/rtnetlink.h> 55 #include <net/net_namespace.h> 56 57 struct rtnl_link { 58 rtnl_doit_func doit; 59 rtnl_dumpit_func dumpit; 60 rtnl_calcit_func calcit; 61 }; 62 63 static DEFINE_MUTEX(rtnl_mutex); 64 65 void rtnl_lock(void) 66 { 67 mutex_lock(&rtnl_mutex); 68 } 69 EXPORT_SYMBOL(rtnl_lock); 70 71 void __rtnl_unlock(void) 72 { 73 mutex_unlock(&rtnl_mutex); 74 } 75 76 void rtnl_unlock(void) 77 { 78 /* This fellow will unlock it for us. */ 79 netdev_run_todo(); 80 } 81 EXPORT_SYMBOL(rtnl_unlock); 82 83 int rtnl_trylock(void) 84 { 85 return mutex_trylock(&rtnl_mutex); 86 } 87 EXPORT_SYMBOL(rtnl_trylock); 88 89 int rtnl_is_locked(void) 90 { 91 return mutex_is_locked(&rtnl_mutex); 92 } 93 EXPORT_SYMBOL(rtnl_is_locked); 94 95 #ifdef CONFIG_PROVE_LOCKING 96 int lockdep_rtnl_is_held(void) 97 { 98 return lockdep_is_held(&rtnl_mutex); 99 } 100 EXPORT_SYMBOL(lockdep_rtnl_is_held); 101 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 102 103 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 104 105 static inline int rtm_msgindex(int msgtype) 106 { 107 int msgindex = msgtype - RTM_BASE; 108 109 /* 110 * msgindex < 0 implies someone tried to register a netlink 111 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 112 * the message type has not been added to linux/rtnetlink.h 113 */ 114 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 115 116 return msgindex; 117 } 118 119 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 120 { 121 struct rtnl_link *tab; 122 123 if (protocol <= RTNL_FAMILY_MAX) 124 tab = rtnl_msg_handlers[protocol]; 125 else 126 tab = NULL; 127 128 if (tab == NULL || tab[msgindex].doit == NULL) 129 tab = rtnl_msg_handlers[PF_UNSPEC]; 130 131 return tab[msgindex].doit; 132 } 133 134 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 135 { 136 struct rtnl_link *tab; 137 138 if (protocol <= RTNL_FAMILY_MAX) 139 tab = rtnl_msg_handlers[protocol]; 140 else 141 tab = NULL; 142 143 if (tab == NULL || tab[msgindex].dumpit == NULL) 144 tab = rtnl_msg_handlers[PF_UNSPEC]; 145 146 return tab[msgindex].dumpit; 147 } 148 149 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 150 { 151 struct rtnl_link *tab; 152 153 if (protocol <= RTNL_FAMILY_MAX) 154 tab = rtnl_msg_handlers[protocol]; 155 else 156 tab = NULL; 157 158 if (tab == NULL || tab[msgindex].calcit == NULL) 159 tab = rtnl_msg_handlers[PF_UNSPEC]; 160 161 return tab[msgindex].calcit; 162 } 163 164 /** 165 * __rtnl_register - Register a rtnetlink message type 166 * @protocol: Protocol family or PF_UNSPEC 167 * @msgtype: rtnetlink message type 168 * @doit: Function pointer called for each request message 169 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 170 * @calcit: Function pointer to calc size of dump message 171 * 172 * Registers the specified function pointers (at least one of them has 173 * to be non-NULL) to be called whenever a request message for the 174 * specified protocol family and message type is received. 175 * 176 * The special protocol family PF_UNSPEC may be used to define fallback 177 * function pointers for the case when no entry for the specific protocol 178 * family exists. 179 * 180 * Returns 0 on success or a negative error code. 181 */ 182 int __rtnl_register(int protocol, int msgtype, 183 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 184 rtnl_calcit_func calcit) 185 { 186 struct rtnl_link *tab; 187 int msgindex; 188 189 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 190 msgindex = rtm_msgindex(msgtype); 191 192 tab = rtnl_msg_handlers[protocol]; 193 if (tab == NULL) { 194 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 195 if (tab == NULL) 196 return -ENOBUFS; 197 198 rtnl_msg_handlers[protocol] = tab; 199 } 200 201 if (doit) 202 tab[msgindex].doit = doit; 203 204 if (dumpit) 205 tab[msgindex].dumpit = dumpit; 206 207 if (calcit) 208 tab[msgindex].calcit = calcit; 209 210 return 0; 211 } 212 EXPORT_SYMBOL_GPL(__rtnl_register); 213 214 /** 215 * rtnl_register - Register a rtnetlink message type 216 * 217 * Identical to __rtnl_register() but panics on failure. This is useful 218 * as failure of this function is very unlikely, it can only happen due 219 * to lack of memory when allocating the chain to store all message 220 * handlers for a protocol. Meant for use in init functions where lack 221 * of memory implies no sense in continuing. 222 */ 223 void rtnl_register(int protocol, int msgtype, 224 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 225 rtnl_calcit_func calcit) 226 { 227 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 228 panic("Unable to register rtnetlink message handler, " 229 "protocol = %d, message type = %d\n", 230 protocol, msgtype); 231 } 232 EXPORT_SYMBOL_GPL(rtnl_register); 233 234 /** 235 * rtnl_unregister - Unregister a rtnetlink message type 236 * @protocol: Protocol family or PF_UNSPEC 237 * @msgtype: rtnetlink message type 238 * 239 * Returns 0 on success or a negative error code. 240 */ 241 int rtnl_unregister(int protocol, int msgtype) 242 { 243 int msgindex; 244 245 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 246 msgindex = rtm_msgindex(msgtype); 247 248 if (rtnl_msg_handlers[protocol] == NULL) 249 return -ENOENT; 250 251 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 252 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 253 254 return 0; 255 } 256 EXPORT_SYMBOL_GPL(rtnl_unregister); 257 258 /** 259 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 260 * @protocol : Protocol family or PF_UNSPEC 261 * 262 * Identical to calling rtnl_unregster() for all registered message types 263 * of a certain protocol family. 264 */ 265 void rtnl_unregister_all(int protocol) 266 { 267 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 268 269 kfree(rtnl_msg_handlers[protocol]); 270 rtnl_msg_handlers[protocol] = NULL; 271 } 272 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 273 274 static LIST_HEAD(link_ops); 275 276 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 277 { 278 const struct rtnl_link_ops *ops; 279 280 list_for_each_entry(ops, &link_ops, list) { 281 if (!strcmp(ops->kind, kind)) 282 return ops; 283 } 284 return NULL; 285 } 286 287 /** 288 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 289 * @ops: struct rtnl_link_ops * to register 290 * 291 * The caller must hold the rtnl_mutex. This function should be used 292 * by drivers that create devices during module initialization. It 293 * must be called before registering the devices. 294 * 295 * Returns 0 on success or a negative error code. 296 */ 297 int __rtnl_link_register(struct rtnl_link_ops *ops) 298 { 299 if (rtnl_link_ops_get(ops->kind)) 300 return -EEXIST; 301 302 /* The check for setup is here because if ops 303 * does not have that filled up, it is not possible 304 * to use the ops for creating device. So do not 305 * fill up dellink as well. That disables rtnl_dellink. 306 */ 307 if (ops->setup && !ops->dellink) 308 ops->dellink = unregister_netdevice_queue; 309 310 list_add_tail(&ops->list, &link_ops); 311 return 0; 312 } 313 EXPORT_SYMBOL_GPL(__rtnl_link_register); 314 315 /** 316 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 317 * @ops: struct rtnl_link_ops * to register 318 * 319 * Returns 0 on success or a negative error code. 320 */ 321 int rtnl_link_register(struct rtnl_link_ops *ops) 322 { 323 int err; 324 325 rtnl_lock(); 326 err = __rtnl_link_register(ops); 327 rtnl_unlock(); 328 return err; 329 } 330 EXPORT_SYMBOL_GPL(rtnl_link_register); 331 332 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 333 { 334 struct net_device *dev; 335 LIST_HEAD(list_kill); 336 337 for_each_netdev(net, dev) { 338 if (dev->rtnl_link_ops == ops) 339 ops->dellink(dev, &list_kill); 340 } 341 unregister_netdevice_many(&list_kill); 342 } 343 344 /** 345 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 346 * @ops: struct rtnl_link_ops * to unregister 347 * 348 * The caller must hold the rtnl_mutex. 349 */ 350 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 351 { 352 struct net *net; 353 354 for_each_net(net) { 355 __rtnl_kill_links(net, ops); 356 } 357 list_del(&ops->list); 358 } 359 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 360 361 /* Return with the rtnl_lock held when there are no network 362 * devices unregistering in any network namespace. 363 */ 364 static void rtnl_lock_unregistering_all(void) 365 { 366 struct net *net; 367 bool unregistering; 368 DEFINE_WAIT(wait); 369 370 for (;;) { 371 prepare_to_wait(&netdev_unregistering_wq, &wait, 372 TASK_UNINTERRUPTIBLE); 373 unregistering = false; 374 rtnl_lock(); 375 for_each_net(net) { 376 if (net->dev_unreg_count > 0) { 377 unregistering = true; 378 break; 379 } 380 } 381 if (!unregistering) 382 break; 383 __rtnl_unlock(); 384 schedule(); 385 } 386 finish_wait(&netdev_unregistering_wq, &wait); 387 } 388 389 /** 390 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 391 * @ops: struct rtnl_link_ops * to unregister 392 */ 393 void rtnl_link_unregister(struct rtnl_link_ops *ops) 394 { 395 /* Close the race with cleanup_net() */ 396 mutex_lock(&net_mutex); 397 rtnl_lock_unregistering_all(); 398 __rtnl_link_unregister(ops); 399 rtnl_unlock(); 400 mutex_unlock(&net_mutex); 401 } 402 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 403 404 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev) 405 { 406 struct net_device *master_dev; 407 const struct rtnl_link_ops *ops; 408 409 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 410 if (!master_dev) 411 return 0; 412 ops = master_dev->rtnl_link_ops; 413 if (!ops || !ops->get_slave_size) 414 return 0; 415 /* IFLA_INFO_SLAVE_DATA + nested data */ 416 return nla_total_size(sizeof(struct nlattr)) + 417 ops->get_slave_size(master_dev, dev); 418 } 419 420 static size_t rtnl_link_get_size(const struct net_device *dev) 421 { 422 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 423 size_t size; 424 425 if (!ops) 426 return 0; 427 428 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 429 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 430 431 if (ops->get_size) 432 /* IFLA_INFO_DATA + nested data */ 433 size += nla_total_size(sizeof(struct nlattr)) + 434 ops->get_size(dev); 435 436 if (ops->get_xstats_size) 437 /* IFLA_INFO_XSTATS */ 438 size += nla_total_size(ops->get_xstats_size(dev)); 439 440 size += rtnl_link_get_slave_info_data_size(dev); 441 442 return size; 443 } 444 445 static LIST_HEAD(rtnl_af_ops); 446 447 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 448 { 449 const struct rtnl_af_ops *ops; 450 451 list_for_each_entry(ops, &rtnl_af_ops, list) { 452 if (ops->family == family) 453 return ops; 454 } 455 456 return NULL; 457 } 458 459 /** 460 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 461 * @ops: struct rtnl_af_ops * to register 462 * 463 * Returns 0 on success or a negative error code. 464 */ 465 void rtnl_af_register(struct rtnl_af_ops *ops) 466 { 467 rtnl_lock(); 468 list_add_tail(&ops->list, &rtnl_af_ops); 469 rtnl_unlock(); 470 } 471 EXPORT_SYMBOL_GPL(rtnl_af_register); 472 473 /** 474 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 475 * @ops: struct rtnl_af_ops * to unregister 476 * 477 * The caller must hold the rtnl_mutex. 478 */ 479 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 480 { 481 list_del(&ops->list); 482 } 483 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 484 485 /** 486 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 487 * @ops: struct rtnl_af_ops * to unregister 488 */ 489 void rtnl_af_unregister(struct rtnl_af_ops *ops) 490 { 491 rtnl_lock(); 492 __rtnl_af_unregister(ops); 493 rtnl_unlock(); 494 } 495 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 496 497 static size_t rtnl_link_get_af_size(const struct net_device *dev) 498 { 499 struct rtnl_af_ops *af_ops; 500 size_t size; 501 502 /* IFLA_AF_SPEC */ 503 size = nla_total_size(sizeof(struct nlattr)); 504 505 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 506 if (af_ops->get_link_af_size) { 507 /* AF_* + nested data */ 508 size += nla_total_size(sizeof(struct nlattr)) + 509 af_ops->get_link_af_size(dev); 510 } 511 } 512 513 return size; 514 } 515 516 static bool rtnl_have_link_slave_info(const struct net_device *dev) 517 { 518 struct net_device *master_dev; 519 520 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 521 if (master_dev && master_dev->rtnl_link_ops) 522 return true; 523 return false; 524 } 525 526 static int rtnl_link_slave_info_fill(struct sk_buff *skb, 527 const struct net_device *dev) 528 { 529 struct net_device *master_dev; 530 const struct rtnl_link_ops *ops; 531 struct nlattr *slave_data; 532 int err; 533 534 master_dev = netdev_master_upper_dev_get((struct net_device *) dev); 535 if (!master_dev) 536 return 0; 537 ops = master_dev->rtnl_link_ops; 538 if (!ops) 539 return 0; 540 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0) 541 return -EMSGSIZE; 542 if (ops->fill_slave_info) { 543 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA); 544 if (!slave_data) 545 return -EMSGSIZE; 546 err = ops->fill_slave_info(skb, master_dev, dev); 547 if (err < 0) 548 goto err_cancel_slave_data; 549 nla_nest_end(skb, slave_data); 550 } 551 return 0; 552 553 err_cancel_slave_data: 554 nla_nest_cancel(skb, slave_data); 555 return err; 556 } 557 558 static int rtnl_link_info_fill(struct sk_buff *skb, 559 const struct net_device *dev) 560 { 561 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 562 struct nlattr *data; 563 int err; 564 565 if (!ops) 566 return 0; 567 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 568 return -EMSGSIZE; 569 if (ops->fill_xstats) { 570 err = ops->fill_xstats(skb, dev); 571 if (err < 0) 572 return err; 573 } 574 if (ops->fill_info) { 575 data = nla_nest_start(skb, IFLA_INFO_DATA); 576 if (data == NULL) 577 return -EMSGSIZE; 578 err = ops->fill_info(skb, dev); 579 if (err < 0) 580 goto err_cancel_data; 581 nla_nest_end(skb, data); 582 } 583 return 0; 584 585 err_cancel_data: 586 nla_nest_cancel(skb, data); 587 return err; 588 } 589 590 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 591 { 592 struct nlattr *linkinfo; 593 int err = -EMSGSIZE; 594 595 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 596 if (linkinfo == NULL) 597 goto out; 598 599 err = rtnl_link_info_fill(skb, dev); 600 if (err < 0) 601 goto err_cancel_link; 602 603 err = rtnl_link_slave_info_fill(skb, dev); 604 if (err < 0) 605 goto err_cancel_link; 606 607 nla_nest_end(skb, linkinfo); 608 return 0; 609 610 err_cancel_link: 611 nla_nest_cancel(skb, linkinfo); 612 out: 613 return err; 614 } 615 616 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 617 { 618 struct sock *rtnl = net->rtnl; 619 int err = 0; 620 621 NETLINK_CB(skb).dst_group = group; 622 if (echo) 623 atomic_inc(&skb->users); 624 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 625 if (echo) 626 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 627 return err; 628 } 629 630 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 631 { 632 struct sock *rtnl = net->rtnl; 633 634 return nlmsg_unicast(rtnl, skb, pid); 635 } 636 EXPORT_SYMBOL(rtnl_unicast); 637 638 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 639 struct nlmsghdr *nlh, gfp_t flags) 640 { 641 struct sock *rtnl = net->rtnl; 642 int report = 0; 643 644 if (nlh) 645 report = nlmsg_report(nlh); 646 647 nlmsg_notify(rtnl, skb, pid, group, report, flags); 648 } 649 EXPORT_SYMBOL(rtnl_notify); 650 651 void rtnl_set_sk_err(struct net *net, u32 group, int error) 652 { 653 struct sock *rtnl = net->rtnl; 654 655 netlink_set_err(rtnl, 0, group, error); 656 } 657 EXPORT_SYMBOL(rtnl_set_sk_err); 658 659 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 660 { 661 struct nlattr *mx; 662 int i, valid = 0; 663 664 mx = nla_nest_start(skb, RTA_METRICS); 665 if (mx == NULL) 666 return -ENOBUFS; 667 668 for (i = 0; i < RTAX_MAX; i++) { 669 if (metrics[i]) { 670 valid++; 671 if (nla_put_u32(skb, i+1, metrics[i])) 672 goto nla_put_failure; 673 } 674 } 675 676 if (!valid) { 677 nla_nest_cancel(skb, mx); 678 return 0; 679 } 680 681 return nla_nest_end(skb, mx); 682 683 nla_put_failure: 684 nla_nest_cancel(skb, mx); 685 return -EMSGSIZE; 686 } 687 EXPORT_SYMBOL(rtnetlink_put_metrics); 688 689 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 690 long expires, u32 error) 691 { 692 struct rta_cacheinfo ci = { 693 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 694 .rta_used = dst->__use, 695 .rta_clntref = atomic_read(&(dst->__refcnt)), 696 .rta_error = error, 697 .rta_id = id, 698 }; 699 700 if (expires) { 701 unsigned long clock; 702 703 clock = jiffies_to_clock_t(abs(expires)); 704 clock = min_t(unsigned long, clock, INT_MAX); 705 ci.rta_expires = (expires > 0) ? clock : -clock; 706 } 707 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 708 } 709 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 710 711 static void set_operstate(struct net_device *dev, unsigned char transition) 712 { 713 unsigned char operstate = dev->operstate; 714 715 switch (transition) { 716 case IF_OPER_UP: 717 if ((operstate == IF_OPER_DORMANT || 718 operstate == IF_OPER_UNKNOWN) && 719 !netif_dormant(dev)) 720 operstate = IF_OPER_UP; 721 break; 722 723 case IF_OPER_DORMANT: 724 if (operstate == IF_OPER_UP || 725 operstate == IF_OPER_UNKNOWN) 726 operstate = IF_OPER_DORMANT; 727 break; 728 } 729 730 if (dev->operstate != operstate) { 731 write_lock_bh(&dev_base_lock); 732 dev->operstate = operstate; 733 write_unlock_bh(&dev_base_lock); 734 netdev_state_change(dev); 735 } 736 } 737 738 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 739 { 740 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 741 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 742 } 743 744 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 745 const struct ifinfomsg *ifm) 746 { 747 unsigned int flags = ifm->ifi_flags; 748 749 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 750 if (ifm->ifi_change) 751 flags = (flags & ifm->ifi_change) | 752 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 753 754 return flags; 755 } 756 757 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 758 const struct rtnl_link_stats64 *b) 759 { 760 a->rx_packets = b->rx_packets; 761 a->tx_packets = b->tx_packets; 762 a->rx_bytes = b->rx_bytes; 763 a->tx_bytes = b->tx_bytes; 764 a->rx_errors = b->rx_errors; 765 a->tx_errors = b->tx_errors; 766 a->rx_dropped = b->rx_dropped; 767 a->tx_dropped = b->tx_dropped; 768 769 a->multicast = b->multicast; 770 a->collisions = b->collisions; 771 772 a->rx_length_errors = b->rx_length_errors; 773 a->rx_over_errors = b->rx_over_errors; 774 a->rx_crc_errors = b->rx_crc_errors; 775 a->rx_frame_errors = b->rx_frame_errors; 776 a->rx_fifo_errors = b->rx_fifo_errors; 777 a->rx_missed_errors = b->rx_missed_errors; 778 779 a->tx_aborted_errors = b->tx_aborted_errors; 780 a->tx_carrier_errors = b->tx_carrier_errors; 781 a->tx_fifo_errors = b->tx_fifo_errors; 782 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 783 a->tx_window_errors = b->tx_window_errors; 784 785 a->rx_compressed = b->rx_compressed; 786 a->tx_compressed = b->tx_compressed; 787 } 788 789 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 790 { 791 memcpy(v, b, sizeof(*b)); 792 } 793 794 /* All VF info */ 795 static inline int rtnl_vfinfo_size(const struct net_device *dev, 796 u32 ext_filter_mask) 797 { 798 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 799 (ext_filter_mask & RTEXT_FILTER_VF)) { 800 int num_vfs = dev_num_vf(dev->dev.parent); 801 size_t size = nla_total_size(sizeof(struct nlattr)); 802 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 803 size += num_vfs * 804 (nla_total_size(sizeof(struct ifla_vf_mac)) + 805 nla_total_size(sizeof(struct ifla_vf_vlan)) + 806 nla_total_size(sizeof(struct ifla_vf_spoofchk)) + 807 nla_total_size(sizeof(struct ifla_vf_rate))); 808 return size; 809 } else 810 return 0; 811 } 812 813 static size_t rtnl_port_size(const struct net_device *dev, 814 u32 ext_filter_mask) 815 { 816 size_t port_size = nla_total_size(4) /* PORT_VF */ 817 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 818 + nla_total_size(sizeof(struct ifla_port_vsi)) 819 /* PORT_VSI_TYPE */ 820 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 821 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 822 + nla_total_size(1) /* PROT_VDP_REQUEST */ 823 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 824 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 825 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 826 + port_size; 827 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 828 + port_size; 829 830 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 831 !(ext_filter_mask & RTEXT_FILTER_VF)) 832 return 0; 833 if (dev_num_vf(dev->dev.parent)) 834 return port_self_size + vf_ports_size + 835 vf_port_size * dev_num_vf(dev->dev.parent); 836 else 837 return port_self_size; 838 } 839 840 static noinline size_t if_nlmsg_size(const struct net_device *dev, 841 u32 ext_filter_mask) 842 { 843 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 844 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 845 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 846 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 847 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 848 + nla_total_size(sizeof(struct rtnl_link_stats)) 849 + nla_total_size(sizeof(struct rtnl_link_stats64)) 850 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 851 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 852 + nla_total_size(4) /* IFLA_TXQLEN */ 853 + nla_total_size(4) /* IFLA_WEIGHT */ 854 + nla_total_size(4) /* IFLA_MTU */ 855 + nla_total_size(4) /* IFLA_LINK */ 856 + nla_total_size(4) /* IFLA_MASTER */ 857 + nla_total_size(1) /* IFLA_CARRIER */ 858 + nla_total_size(4) /* IFLA_PROMISCUITY */ 859 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 860 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 861 + nla_total_size(1) /* IFLA_OPERSTATE */ 862 + nla_total_size(1) /* IFLA_LINKMODE */ 863 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 864 + nla_total_size(ext_filter_mask 865 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 866 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 867 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 868 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 869 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */ 870 + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */ 871 } 872 873 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 874 { 875 struct nlattr *vf_ports; 876 struct nlattr *vf_port; 877 int vf; 878 int err; 879 880 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 881 if (!vf_ports) 882 return -EMSGSIZE; 883 884 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 885 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 886 if (!vf_port) 887 goto nla_put_failure; 888 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 889 goto nla_put_failure; 890 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 891 if (err == -EMSGSIZE) 892 goto nla_put_failure; 893 if (err) { 894 nla_nest_cancel(skb, vf_port); 895 continue; 896 } 897 nla_nest_end(skb, vf_port); 898 } 899 900 nla_nest_end(skb, vf_ports); 901 902 return 0; 903 904 nla_put_failure: 905 nla_nest_cancel(skb, vf_ports); 906 return -EMSGSIZE; 907 } 908 909 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 910 { 911 struct nlattr *port_self; 912 int err; 913 914 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 915 if (!port_self) 916 return -EMSGSIZE; 917 918 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 919 if (err) { 920 nla_nest_cancel(skb, port_self); 921 return (err == -EMSGSIZE) ? err : 0; 922 } 923 924 nla_nest_end(skb, port_self); 925 926 return 0; 927 } 928 929 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 930 u32 ext_filter_mask) 931 { 932 int err; 933 934 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 935 !(ext_filter_mask & RTEXT_FILTER_VF)) 936 return 0; 937 938 err = rtnl_port_self_fill(skb, dev); 939 if (err) 940 return err; 941 942 if (dev_num_vf(dev->dev.parent)) { 943 err = rtnl_vf_ports_fill(skb, dev); 944 if (err) 945 return err; 946 } 947 948 return 0; 949 } 950 951 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 952 { 953 int err; 954 struct netdev_phys_port_id ppid; 955 956 err = dev_get_phys_port_id(dev, &ppid); 957 if (err) { 958 if (err == -EOPNOTSUPP) 959 return 0; 960 return err; 961 } 962 963 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 964 return -EMSGSIZE; 965 966 return 0; 967 } 968 969 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 970 int type, u32 pid, u32 seq, u32 change, 971 unsigned int flags, u32 ext_filter_mask) 972 { 973 struct ifinfomsg *ifm; 974 struct nlmsghdr *nlh; 975 struct rtnl_link_stats64 temp; 976 const struct rtnl_link_stats64 *stats; 977 struct nlattr *attr, *af_spec; 978 struct rtnl_af_ops *af_ops; 979 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 980 981 ASSERT_RTNL(); 982 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 983 if (nlh == NULL) 984 return -EMSGSIZE; 985 986 ifm = nlmsg_data(nlh); 987 ifm->ifi_family = AF_UNSPEC; 988 ifm->__ifi_pad = 0; 989 ifm->ifi_type = dev->type; 990 ifm->ifi_index = dev->ifindex; 991 ifm->ifi_flags = dev_get_flags(dev); 992 ifm->ifi_change = change; 993 994 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 995 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 996 nla_put_u8(skb, IFLA_OPERSTATE, 997 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 998 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 999 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1000 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1001 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1002 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1003 #ifdef CONFIG_RPS 1004 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1005 #endif 1006 (dev->ifindex != dev->iflink && 1007 nla_put_u32(skb, IFLA_LINK, dev->iflink)) || 1008 (upper_dev && 1009 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1010 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1011 (dev->qdisc && 1012 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1013 (dev->ifalias && 1014 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1015 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1016 atomic_read(&dev->carrier_changes))) 1017 goto nla_put_failure; 1018 1019 if (1) { 1020 struct rtnl_link_ifmap map = { 1021 .mem_start = dev->mem_start, 1022 .mem_end = dev->mem_end, 1023 .base_addr = dev->base_addr, 1024 .irq = dev->irq, 1025 .dma = dev->dma, 1026 .port = dev->if_port, 1027 }; 1028 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1029 goto nla_put_failure; 1030 } 1031 1032 if (dev->addr_len) { 1033 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1034 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1035 goto nla_put_failure; 1036 } 1037 1038 if (rtnl_phys_port_id_fill(skb, dev)) 1039 goto nla_put_failure; 1040 1041 attr = nla_reserve(skb, IFLA_STATS, 1042 sizeof(struct rtnl_link_stats)); 1043 if (attr == NULL) 1044 goto nla_put_failure; 1045 1046 stats = dev_get_stats(dev, &temp); 1047 copy_rtnl_link_stats(nla_data(attr), stats); 1048 1049 attr = nla_reserve(skb, IFLA_STATS64, 1050 sizeof(struct rtnl_link_stats64)); 1051 if (attr == NULL) 1052 goto nla_put_failure; 1053 copy_rtnl_link_stats64(nla_data(attr), stats); 1054 1055 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1056 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1057 goto nla_put_failure; 1058 1059 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 1060 && (ext_filter_mask & RTEXT_FILTER_VF)) { 1061 int i; 1062 1063 struct nlattr *vfinfo, *vf; 1064 int num_vfs = dev_num_vf(dev->dev.parent); 1065 1066 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1067 if (!vfinfo) 1068 goto nla_put_failure; 1069 for (i = 0; i < num_vfs; i++) { 1070 struct ifla_vf_info ivi; 1071 struct ifla_vf_mac vf_mac; 1072 struct ifla_vf_vlan vf_vlan; 1073 struct ifla_vf_rate vf_rate; 1074 struct ifla_vf_tx_rate vf_tx_rate; 1075 struct ifla_vf_spoofchk vf_spoofchk; 1076 struct ifla_vf_link_state vf_linkstate; 1077 1078 /* 1079 * Not all SR-IOV capable drivers support the 1080 * spoofcheck query. Preset to -1 so the user 1081 * space tool can detect that the driver didn't 1082 * report anything. 1083 */ 1084 ivi.spoofchk = -1; 1085 memset(ivi.mac, 0, sizeof(ivi.mac)); 1086 /* The default value for VF link state is "auto" 1087 * IFLA_VF_LINK_STATE_AUTO which equals zero 1088 */ 1089 ivi.linkstate = 0; 1090 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 1091 break; 1092 vf_mac.vf = 1093 vf_vlan.vf = 1094 vf_rate.vf = 1095 vf_tx_rate.vf = 1096 vf_spoofchk.vf = 1097 vf_linkstate.vf = ivi.vf; 1098 1099 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1100 vf_vlan.vlan = ivi.vlan; 1101 vf_vlan.qos = ivi.qos; 1102 vf_tx_rate.rate = ivi.max_tx_rate; 1103 vf_rate.min_tx_rate = ivi.min_tx_rate; 1104 vf_rate.max_tx_rate = ivi.max_tx_rate; 1105 vf_spoofchk.setting = ivi.spoofchk; 1106 vf_linkstate.link_state = ivi.linkstate; 1107 vf = nla_nest_start(skb, IFLA_VF_INFO); 1108 if (!vf) { 1109 nla_nest_cancel(skb, vfinfo); 1110 goto nla_put_failure; 1111 } 1112 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1113 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1114 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1115 &vf_rate) || 1116 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1117 &vf_tx_rate) || 1118 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1119 &vf_spoofchk) || 1120 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1121 &vf_linkstate)) 1122 goto nla_put_failure; 1123 nla_nest_end(skb, vf); 1124 } 1125 nla_nest_end(skb, vfinfo); 1126 } 1127 1128 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1129 goto nla_put_failure; 1130 1131 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1132 if (rtnl_link_fill(skb, dev) < 0) 1133 goto nla_put_failure; 1134 } 1135 1136 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1137 goto nla_put_failure; 1138 1139 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1140 if (af_ops->fill_link_af) { 1141 struct nlattr *af; 1142 int err; 1143 1144 if (!(af = nla_nest_start(skb, af_ops->family))) 1145 goto nla_put_failure; 1146 1147 err = af_ops->fill_link_af(skb, dev); 1148 1149 /* 1150 * Caller may return ENODATA to indicate that there 1151 * was no data to be dumped. This is not an error, it 1152 * means we should trim the attribute header and 1153 * continue. 1154 */ 1155 if (err == -ENODATA) 1156 nla_nest_cancel(skb, af); 1157 else if (err < 0) 1158 goto nla_put_failure; 1159 1160 nla_nest_end(skb, af); 1161 } 1162 } 1163 1164 nla_nest_end(skb, af_spec); 1165 1166 return nlmsg_end(skb, nlh); 1167 1168 nla_put_failure: 1169 nlmsg_cancel(skb, nlh); 1170 return -EMSGSIZE; 1171 } 1172 1173 static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1174 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1175 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1176 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1177 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1178 [IFLA_MTU] = { .type = NLA_U32 }, 1179 [IFLA_LINK] = { .type = NLA_U32 }, 1180 [IFLA_MASTER] = { .type = NLA_U32 }, 1181 [IFLA_CARRIER] = { .type = NLA_U8 }, 1182 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1183 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1184 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1185 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1186 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1187 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1188 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1189 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1190 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1191 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1192 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1193 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1194 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1195 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1196 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1197 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1198 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN }, 1199 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1200 }; 1201 1202 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1203 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1204 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1205 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1206 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1207 }; 1208 1209 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1210 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1211 }; 1212 1213 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1214 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1215 .len = sizeof(struct ifla_vf_mac) }, 1216 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1217 .len = sizeof(struct ifla_vf_vlan) }, 1218 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1219 .len = sizeof(struct ifla_vf_tx_rate) }, 1220 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY, 1221 .len = sizeof(struct ifla_vf_spoofchk) }, 1222 [IFLA_VF_RATE] = { .type = NLA_BINARY, 1223 .len = sizeof(struct ifla_vf_rate) }, 1224 [IFLA_VF_LINK_STATE] = { .type = NLA_BINARY, 1225 .len = sizeof(struct ifla_vf_link_state) }, 1226 }; 1227 1228 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1229 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1230 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1231 .len = PORT_PROFILE_MAX }, 1232 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1233 .len = sizeof(struct ifla_port_vsi)}, 1234 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1235 .len = PORT_UUID_MAX }, 1236 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1237 .len = PORT_UUID_MAX }, 1238 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1239 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1240 }; 1241 1242 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1243 { 1244 struct net *net = sock_net(skb->sk); 1245 int h, s_h; 1246 int idx = 0, s_idx; 1247 struct net_device *dev; 1248 struct hlist_head *head; 1249 struct nlattr *tb[IFLA_MAX+1]; 1250 u32 ext_filter_mask = 0; 1251 int err; 1252 int hdrlen; 1253 1254 s_h = cb->args[0]; 1255 s_idx = cb->args[1]; 1256 1257 rcu_read_lock(); 1258 cb->seq = net->dev_base_seq; 1259 1260 /* A hack to preserve kernel<->userspace interface. 1261 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1262 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1263 * what iproute2 < v3.9.0 used. 1264 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1265 * attribute, its netlink message is shorter than struct ifinfomsg. 1266 */ 1267 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1268 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1269 1270 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1271 1272 if (tb[IFLA_EXT_MASK]) 1273 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1274 } 1275 1276 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1277 idx = 0; 1278 head = &net->dev_index_head[h]; 1279 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1280 if (idx < s_idx) 1281 goto cont; 1282 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1283 NETLINK_CB(cb->skb).portid, 1284 cb->nlh->nlmsg_seq, 0, 1285 NLM_F_MULTI, 1286 ext_filter_mask); 1287 /* If we ran out of room on the first message, 1288 * we're in trouble 1289 */ 1290 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1291 1292 if (err <= 0) 1293 goto out; 1294 1295 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1296 cont: 1297 idx++; 1298 } 1299 } 1300 out: 1301 rcu_read_unlock(); 1302 cb->args[1] = idx; 1303 cb->args[0] = h; 1304 1305 return skb->len; 1306 } 1307 1308 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1309 { 1310 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1311 } 1312 EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1313 1314 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1315 { 1316 struct net *net; 1317 /* Examine the link attributes and figure out which 1318 * network namespace we are talking about. 1319 */ 1320 if (tb[IFLA_NET_NS_PID]) 1321 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1322 else if (tb[IFLA_NET_NS_FD]) 1323 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1324 else 1325 net = get_net(src_net); 1326 return net; 1327 } 1328 EXPORT_SYMBOL(rtnl_link_get_net); 1329 1330 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1331 { 1332 if (dev) { 1333 if (tb[IFLA_ADDRESS] && 1334 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1335 return -EINVAL; 1336 1337 if (tb[IFLA_BROADCAST] && 1338 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1339 return -EINVAL; 1340 } 1341 1342 if (tb[IFLA_AF_SPEC]) { 1343 struct nlattr *af; 1344 int rem, err; 1345 1346 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1347 const struct rtnl_af_ops *af_ops; 1348 1349 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1350 return -EAFNOSUPPORT; 1351 1352 if (!af_ops->set_link_af) 1353 return -EOPNOTSUPP; 1354 1355 if (af_ops->validate_link_af) { 1356 err = af_ops->validate_link_af(dev, af); 1357 if (err < 0) 1358 return err; 1359 } 1360 } 1361 } 1362 1363 return 0; 1364 } 1365 1366 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1367 { 1368 int rem, err = -EINVAL; 1369 struct nlattr *vf; 1370 const struct net_device_ops *ops = dev->netdev_ops; 1371 1372 nla_for_each_nested(vf, attr, rem) { 1373 switch (nla_type(vf)) { 1374 case IFLA_VF_MAC: { 1375 struct ifla_vf_mac *ivm; 1376 ivm = nla_data(vf); 1377 err = -EOPNOTSUPP; 1378 if (ops->ndo_set_vf_mac) 1379 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1380 ivm->mac); 1381 break; 1382 } 1383 case IFLA_VF_VLAN: { 1384 struct ifla_vf_vlan *ivv; 1385 ivv = nla_data(vf); 1386 err = -EOPNOTSUPP; 1387 if (ops->ndo_set_vf_vlan) 1388 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1389 ivv->vlan, 1390 ivv->qos); 1391 break; 1392 } 1393 case IFLA_VF_TX_RATE: { 1394 struct ifla_vf_tx_rate *ivt; 1395 struct ifla_vf_info ivf; 1396 ivt = nla_data(vf); 1397 err = -EOPNOTSUPP; 1398 if (ops->ndo_get_vf_config) 1399 err = ops->ndo_get_vf_config(dev, ivt->vf, 1400 &ivf); 1401 if (err) 1402 break; 1403 err = -EOPNOTSUPP; 1404 if (ops->ndo_set_vf_rate) 1405 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1406 ivf.min_tx_rate, 1407 ivt->rate); 1408 break; 1409 } 1410 case IFLA_VF_RATE: { 1411 struct ifla_vf_rate *ivt; 1412 ivt = nla_data(vf); 1413 err = -EOPNOTSUPP; 1414 if (ops->ndo_set_vf_rate) 1415 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1416 ivt->min_tx_rate, 1417 ivt->max_tx_rate); 1418 break; 1419 } 1420 case IFLA_VF_SPOOFCHK: { 1421 struct ifla_vf_spoofchk *ivs; 1422 ivs = nla_data(vf); 1423 err = -EOPNOTSUPP; 1424 if (ops->ndo_set_vf_spoofchk) 1425 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1426 ivs->setting); 1427 break; 1428 } 1429 case IFLA_VF_LINK_STATE: { 1430 struct ifla_vf_link_state *ivl; 1431 ivl = nla_data(vf); 1432 err = -EOPNOTSUPP; 1433 if (ops->ndo_set_vf_link_state) 1434 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1435 ivl->link_state); 1436 break; 1437 } 1438 default: 1439 err = -EINVAL; 1440 break; 1441 } 1442 if (err) 1443 break; 1444 } 1445 return err; 1446 } 1447 1448 static int do_set_master(struct net_device *dev, int ifindex) 1449 { 1450 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1451 const struct net_device_ops *ops; 1452 int err; 1453 1454 if (upper_dev) { 1455 if (upper_dev->ifindex == ifindex) 1456 return 0; 1457 ops = upper_dev->netdev_ops; 1458 if (ops->ndo_del_slave) { 1459 err = ops->ndo_del_slave(upper_dev, dev); 1460 if (err) 1461 return err; 1462 } else { 1463 return -EOPNOTSUPP; 1464 } 1465 } 1466 1467 if (ifindex) { 1468 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1469 if (!upper_dev) 1470 return -EINVAL; 1471 ops = upper_dev->netdev_ops; 1472 if (ops->ndo_add_slave) { 1473 err = ops->ndo_add_slave(upper_dev, dev); 1474 if (err) 1475 return err; 1476 } else { 1477 return -EOPNOTSUPP; 1478 } 1479 } 1480 return 0; 1481 } 1482 1483 static int do_setlink(const struct sk_buff *skb, 1484 struct net_device *dev, struct ifinfomsg *ifm, 1485 struct nlattr **tb, char *ifname, int modified) 1486 { 1487 const struct net_device_ops *ops = dev->netdev_ops; 1488 int err; 1489 1490 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1491 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1492 if (IS_ERR(net)) { 1493 err = PTR_ERR(net); 1494 goto errout; 1495 } 1496 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1497 err = -EPERM; 1498 goto errout; 1499 } 1500 err = dev_change_net_namespace(dev, net, ifname); 1501 put_net(net); 1502 if (err) 1503 goto errout; 1504 modified = 1; 1505 } 1506 1507 if (tb[IFLA_MAP]) { 1508 struct rtnl_link_ifmap *u_map; 1509 struct ifmap k_map; 1510 1511 if (!ops->ndo_set_config) { 1512 err = -EOPNOTSUPP; 1513 goto errout; 1514 } 1515 1516 if (!netif_device_present(dev)) { 1517 err = -ENODEV; 1518 goto errout; 1519 } 1520 1521 u_map = nla_data(tb[IFLA_MAP]); 1522 k_map.mem_start = (unsigned long) u_map->mem_start; 1523 k_map.mem_end = (unsigned long) u_map->mem_end; 1524 k_map.base_addr = (unsigned short) u_map->base_addr; 1525 k_map.irq = (unsigned char) u_map->irq; 1526 k_map.dma = (unsigned char) u_map->dma; 1527 k_map.port = (unsigned char) u_map->port; 1528 1529 err = ops->ndo_set_config(dev, &k_map); 1530 if (err < 0) 1531 goto errout; 1532 1533 modified = 1; 1534 } 1535 1536 if (tb[IFLA_ADDRESS]) { 1537 struct sockaddr *sa; 1538 int len; 1539 1540 len = sizeof(sa_family_t) + dev->addr_len; 1541 sa = kmalloc(len, GFP_KERNEL); 1542 if (!sa) { 1543 err = -ENOMEM; 1544 goto errout; 1545 } 1546 sa->sa_family = dev->type; 1547 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1548 dev->addr_len); 1549 err = dev_set_mac_address(dev, sa); 1550 kfree(sa); 1551 if (err) 1552 goto errout; 1553 modified = 1; 1554 } 1555 1556 if (tb[IFLA_MTU]) { 1557 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1558 if (err < 0) 1559 goto errout; 1560 modified = 1; 1561 } 1562 1563 if (tb[IFLA_GROUP]) { 1564 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1565 modified = 1; 1566 } 1567 1568 /* 1569 * Interface selected by interface index but interface 1570 * name provided implies that a name change has been 1571 * requested. 1572 */ 1573 if (ifm->ifi_index > 0 && ifname[0]) { 1574 err = dev_change_name(dev, ifname); 1575 if (err < 0) 1576 goto errout; 1577 modified = 1; 1578 } 1579 1580 if (tb[IFLA_IFALIAS]) { 1581 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1582 nla_len(tb[IFLA_IFALIAS])); 1583 if (err < 0) 1584 goto errout; 1585 modified = 1; 1586 } 1587 1588 if (tb[IFLA_BROADCAST]) { 1589 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1590 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1591 } 1592 1593 if (ifm->ifi_flags || ifm->ifi_change) { 1594 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1595 if (err < 0) 1596 goto errout; 1597 } 1598 1599 if (tb[IFLA_MASTER]) { 1600 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1601 if (err) 1602 goto errout; 1603 modified = 1; 1604 } 1605 1606 if (tb[IFLA_CARRIER]) { 1607 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1608 if (err) 1609 goto errout; 1610 modified = 1; 1611 } 1612 1613 if (tb[IFLA_TXQLEN]) 1614 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1615 1616 if (tb[IFLA_OPERSTATE]) 1617 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1618 1619 if (tb[IFLA_LINKMODE]) { 1620 write_lock_bh(&dev_base_lock); 1621 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1622 write_unlock_bh(&dev_base_lock); 1623 } 1624 1625 if (tb[IFLA_VFINFO_LIST]) { 1626 struct nlattr *attr; 1627 int rem; 1628 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1629 if (nla_type(attr) != IFLA_VF_INFO) { 1630 err = -EINVAL; 1631 goto errout; 1632 } 1633 err = do_setvfinfo(dev, attr); 1634 if (err < 0) 1635 goto errout; 1636 modified = 1; 1637 } 1638 } 1639 err = 0; 1640 1641 if (tb[IFLA_VF_PORTS]) { 1642 struct nlattr *port[IFLA_PORT_MAX+1]; 1643 struct nlattr *attr; 1644 int vf; 1645 int rem; 1646 1647 err = -EOPNOTSUPP; 1648 if (!ops->ndo_set_vf_port) 1649 goto errout; 1650 1651 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1652 if (nla_type(attr) != IFLA_VF_PORT) 1653 continue; 1654 err = nla_parse_nested(port, IFLA_PORT_MAX, 1655 attr, ifla_port_policy); 1656 if (err < 0) 1657 goto errout; 1658 if (!port[IFLA_PORT_VF]) { 1659 err = -EOPNOTSUPP; 1660 goto errout; 1661 } 1662 vf = nla_get_u32(port[IFLA_PORT_VF]); 1663 err = ops->ndo_set_vf_port(dev, vf, port); 1664 if (err < 0) 1665 goto errout; 1666 modified = 1; 1667 } 1668 } 1669 err = 0; 1670 1671 if (tb[IFLA_PORT_SELF]) { 1672 struct nlattr *port[IFLA_PORT_MAX+1]; 1673 1674 err = nla_parse_nested(port, IFLA_PORT_MAX, 1675 tb[IFLA_PORT_SELF], ifla_port_policy); 1676 if (err < 0) 1677 goto errout; 1678 1679 err = -EOPNOTSUPP; 1680 if (ops->ndo_set_vf_port) 1681 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1682 if (err < 0) 1683 goto errout; 1684 modified = 1; 1685 } 1686 1687 if (tb[IFLA_AF_SPEC]) { 1688 struct nlattr *af; 1689 int rem; 1690 1691 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1692 const struct rtnl_af_ops *af_ops; 1693 1694 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1695 BUG(); 1696 1697 err = af_ops->set_link_af(dev, af); 1698 if (err < 0) 1699 goto errout; 1700 1701 modified = 1; 1702 } 1703 } 1704 err = 0; 1705 1706 errout: 1707 if (err < 0 && modified) 1708 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", 1709 dev->name); 1710 1711 return err; 1712 } 1713 1714 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1715 { 1716 struct net *net = sock_net(skb->sk); 1717 struct ifinfomsg *ifm; 1718 struct net_device *dev; 1719 int err; 1720 struct nlattr *tb[IFLA_MAX+1]; 1721 char ifname[IFNAMSIZ]; 1722 1723 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1724 if (err < 0) 1725 goto errout; 1726 1727 if (tb[IFLA_IFNAME]) 1728 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1729 else 1730 ifname[0] = '\0'; 1731 1732 err = -EINVAL; 1733 ifm = nlmsg_data(nlh); 1734 if (ifm->ifi_index > 0) 1735 dev = __dev_get_by_index(net, ifm->ifi_index); 1736 else if (tb[IFLA_IFNAME]) 1737 dev = __dev_get_by_name(net, ifname); 1738 else 1739 goto errout; 1740 1741 if (dev == NULL) { 1742 err = -ENODEV; 1743 goto errout; 1744 } 1745 1746 err = validate_linkmsg(dev, tb); 1747 if (err < 0) 1748 goto errout; 1749 1750 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 1751 errout: 1752 return err; 1753 } 1754 1755 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1756 { 1757 struct net *net = sock_net(skb->sk); 1758 const struct rtnl_link_ops *ops; 1759 struct net_device *dev; 1760 struct ifinfomsg *ifm; 1761 char ifname[IFNAMSIZ]; 1762 struct nlattr *tb[IFLA_MAX+1]; 1763 int err; 1764 LIST_HEAD(list_kill); 1765 1766 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1767 if (err < 0) 1768 return err; 1769 1770 if (tb[IFLA_IFNAME]) 1771 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1772 1773 ifm = nlmsg_data(nlh); 1774 if (ifm->ifi_index > 0) 1775 dev = __dev_get_by_index(net, ifm->ifi_index); 1776 else if (tb[IFLA_IFNAME]) 1777 dev = __dev_get_by_name(net, ifname); 1778 else 1779 return -EINVAL; 1780 1781 if (!dev) 1782 return -ENODEV; 1783 1784 ops = dev->rtnl_link_ops; 1785 if (!ops || !ops->dellink) 1786 return -EOPNOTSUPP; 1787 1788 ops->dellink(dev, &list_kill); 1789 unregister_netdevice_many(&list_kill); 1790 return 0; 1791 } 1792 1793 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1794 { 1795 unsigned int old_flags; 1796 int err; 1797 1798 old_flags = dev->flags; 1799 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1800 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1801 if (err < 0) 1802 return err; 1803 } 1804 1805 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1806 1807 __dev_notify_flags(dev, old_flags, ~0U); 1808 return 0; 1809 } 1810 EXPORT_SYMBOL(rtnl_configure_link); 1811 1812 struct net_device *rtnl_create_link(struct net *net, 1813 char *ifname, unsigned char name_assign_type, 1814 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1815 { 1816 int err; 1817 struct net_device *dev; 1818 unsigned int num_tx_queues = 1; 1819 unsigned int num_rx_queues = 1; 1820 1821 if (tb[IFLA_NUM_TX_QUEUES]) 1822 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1823 else if (ops->get_num_tx_queues) 1824 num_tx_queues = ops->get_num_tx_queues(); 1825 1826 if (tb[IFLA_NUM_RX_QUEUES]) 1827 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1828 else if (ops->get_num_rx_queues) 1829 num_rx_queues = ops->get_num_rx_queues(); 1830 1831 err = -ENOMEM; 1832 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 1833 ops->setup, num_tx_queues, num_rx_queues); 1834 if (!dev) 1835 goto err; 1836 1837 dev_net_set(dev, net); 1838 dev->rtnl_link_ops = ops; 1839 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1840 1841 if (tb[IFLA_MTU]) 1842 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1843 if (tb[IFLA_ADDRESS]) { 1844 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1845 nla_len(tb[IFLA_ADDRESS])); 1846 dev->addr_assign_type = NET_ADDR_SET; 1847 } 1848 if (tb[IFLA_BROADCAST]) 1849 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1850 nla_len(tb[IFLA_BROADCAST])); 1851 if (tb[IFLA_TXQLEN]) 1852 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1853 if (tb[IFLA_OPERSTATE]) 1854 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1855 if (tb[IFLA_LINKMODE]) 1856 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1857 if (tb[IFLA_GROUP]) 1858 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1859 1860 return dev; 1861 1862 err: 1863 return ERR_PTR(err); 1864 } 1865 EXPORT_SYMBOL(rtnl_create_link); 1866 1867 static int rtnl_group_changelink(const struct sk_buff *skb, 1868 struct net *net, int group, 1869 struct ifinfomsg *ifm, 1870 struct nlattr **tb) 1871 { 1872 struct net_device *dev; 1873 int err; 1874 1875 for_each_netdev(net, dev) { 1876 if (dev->group == group) { 1877 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 1878 if (err < 0) 1879 return err; 1880 } 1881 } 1882 1883 return 0; 1884 } 1885 1886 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1887 { 1888 struct net *net = sock_net(skb->sk); 1889 const struct rtnl_link_ops *ops; 1890 const struct rtnl_link_ops *m_ops = NULL; 1891 struct net_device *dev; 1892 struct net_device *master_dev = NULL; 1893 struct ifinfomsg *ifm; 1894 char kind[MODULE_NAME_LEN]; 1895 char ifname[IFNAMSIZ]; 1896 struct nlattr *tb[IFLA_MAX+1]; 1897 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1898 unsigned char name_assign_type = NET_NAME_USER; 1899 int err; 1900 1901 #ifdef CONFIG_MODULES 1902 replay: 1903 #endif 1904 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1905 if (err < 0) 1906 return err; 1907 1908 if (tb[IFLA_IFNAME]) 1909 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1910 else 1911 ifname[0] = '\0'; 1912 1913 ifm = nlmsg_data(nlh); 1914 if (ifm->ifi_index > 0) 1915 dev = __dev_get_by_index(net, ifm->ifi_index); 1916 else { 1917 if (ifname[0]) 1918 dev = __dev_get_by_name(net, ifname); 1919 else 1920 dev = NULL; 1921 } 1922 1923 if (dev) { 1924 master_dev = netdev_master_upper_dev_get(dev); 1925 if (master_dev) 1926 m_ops = master_dev->rtnl_link_ops; 1927 } 1928 1929 err = validate_linkmsg(dev, tb); 1930 if (err < 0) 1931 return err; 1932 1933 if (tb[IFLA_LINKINFO]) { 1934 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1935 tb[IFLA_LINKINFO], ifla_info_policy); 1936 if (err < 0) 1937 return err; 1938 } else 1939 memset(linkinfo, 0, sizeof(linkinfo)); 1940 1941 if (linkinfo[IFLA_INFO_KIND]) { 1942 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1943 ops = rtnl_link_ops_get(kind); 1944 } else { 1945 kind[0] = '\0'; 1946 ops = NULL; 1947 } 1948 1949 if (1) { 1950 struct nlattr *attr[ops ? ops->maxtype + 1 : 0]; 1951 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 0]; 1952 struct nlattr **data = NULL; 1953 struct nlattr **slave_data = NULL; 1954 struct net *dest_net; 1955 1956 if (ops) { 1957 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1958 err = nla_parse_nested(attr, ops->maxtype, 1959 linkinfo[IFLA_INFO_DATA], 1960 ops->policy); 1961 if (err < 0) 1962 return err; 1963 data = attr; 1964 } 1965 if (ops->validate) { 1966 err = ops->validate(tb, data); 1967 if (err < 0) 1968 return err; 1969 } 1970 } 1971 1972 if (m_ops) { 1973 if (m_ops->slave_maxtype && 1974 linkinfo[IFLA_INFO_SLAVE_DATA]) { 1975 err = nla_parse_nested(slave_attr, 1976 m_ops->slave_maxtype, 1977 linkinfo[IFLA_INFO_SLAVE_DATA], 1978 m_ops->slave_policy); 1979 if (err < 0) 1980 return err; 1981 slave_data = slave_attr; 1982 } 1983 if (m_ops->slave_validate) { 1984 err = m_ops->slave_validate(tb, slave_data); 1985 if (err < 0) 1986 return err; 1987 } 1988 } 1989 1990 if (dev) { 1991 int modified = 0; 1992 1993 if (nlh->nlmsg_flags & NLM_F_EXCL) 1994 return -EEXIST; 1995 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1996 return -EOPNOTSUPP; 1997 1998 if (linkinfo[IFLA_INFO_DATA]) { 1999 if (!ops || ops != dev->rtnl_link_ops || 2000 !ops->changelink) 2001 return -EOPNOTSUPP; 2002 2003 err = ops->changelink(dev, tb, data); 2004 if (err < 0) 2005 return err; 2006 modified = 1; 2007 } 2008 2009 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2010 if (!m_ops || !m_ops->slave_changelink) 2011 return -EOPNOTSUPP; 2012 2013 err = m_ops->slave_changelink(master_dev, dev, 2014 tb, slave_data); 2015 if (err < 0) 2016 return err; 2017 modified = 1; 2018 } 2019 2020 return do_setlink(skb, dev, ifm, tb, ifname, modified); 2021 } 2022 2023 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2024 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2025 return rtnl_group_changelink(skb, net, 2026 nla_get_u32(tb[IFLA_GROUP]), 2027 ifm, tb); 2028 return -ENODEV; 2029 } 2030 2031 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2032 return -EOPNOTSUPP; 2033 2034 if (!ops) { 2035 #ifdef CONFIG_MODULES 2036 if (kind[0]) { 2037 __rtnl_unlock(); 2038 request_module("rtnl-link-%s", kind); 2039 rtnl_lock(); 2040 ops = rtnl_link_ops_get(kind); 2041 if (ops) 2042 goto replay; 2043 } 2044 #endif 2045 return -EOPNOTSUPP; 2046 } 2047 2048 if (!ops->setup) 2049 return -EOPNOTSUPP; 2050 2051 if (!ifname[0]) { 2052 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2053 name_assign_type = NET_NAME_ENUM; 2054 } 2055 2056 dest_net = rtnl_link_get_net(net, tb); 2057 if (IS_ERR(dest_net)) 2058 return PTR_ERR(dest_net); 2059 2060 dev = rtnl_create_link(dest_net, ifname, name_assign_type, ops, tb); 2061 if (IS_ERR(dev)) { 2062 err = PTR_ERR(dev); 2063 goto out; 2064 } 2065 2066 dev->ifindex = ifm->ifi_index; 2067 2068 if (ops->newlink) { 2069 err = ops->newlink(net, dev, tb, data); 2070 /* Drivers should call free_netdev() in ->destructor 2071 * and unregister it on failure after registration 2072 * so that device could be finally freed in rtnl_unlock. 2073 */ 2074 if (err < 0) { 2075 /* If device is not registered at all, free it now */ 2076 if (dev->reg_state == NETREG_UNINITIALIZED) 2077 free_netdev(dev); 2078 goto out; 2079 } 2080 } else { 2081 err = register_netdevice(dev); 2082 if (err < 0) { 2083 free_netdev(dev); 2084 goto out; 2085 } 2086 } 2087 err = rtnl_configure_link(dev, ifm); 2088 if (err < 0) 2089 unregister_netdevice(dev); 2090 out: 2091 put_net(dest_net); 2092 return err; 2093 } 2094 } 2095 2096 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2097 { 2098 struct net *net = sock_net(skb->sk); 2099 struct ifinfomsg *ifm; 2100 char ifname[IFNAMSIZ]; 2101 struct nlattr *tb[IFLA_MAX+1]; 2102 struct net_device *dev = NULL; 2103 struct sk_buff *nskb; 2104 int err; 2105 u32 ext_filter_mask = 0; 2106 2107 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2108 if (err < 0) 2109 return err; 2110 2111 if (tb[IFLA_IFNAME]) 2112 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2113 2114 if (tb[IFLA_EXT_MASK]) 2115 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2116 2117 ifm = nlmsg_data(nlh); 2118 if (ifm->ifi_index > 0) 2119 dev = __dev_get_by_index(net, ifm->ifi_index); 2120 else if (tb[IFLA_IFNAME]) 2121 dev = __dev_get_by_name(net, ifname); 2122 else 2123 return -EINVAL; 2124 2125 if (dev == NULL) 2126 return -ENODEV; 2127 2128 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2129 if (nskb == NULL) 2130 return -ENOBUFS; 2131 2132 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2133 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2134 if (err < 0) { 2135 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2136 WARN_ON(err == -EMSGSIZE); 2137 kfree_skb(nskb); 2138 } else 2139 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2140 2141 return err; 2142 } 2143 2144 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2145 { 2146 struct net *net = sock_net(skb->sk); 2147 struct net_device *dev; 2148 struct nlattr *tb[IFLA_MAX+1]; 2149 u32 ext_filter_mask = 0; 2150 u16 min_ifinfo_dump_size = 0; 2151 int hdrlen; 2152 2153 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2154 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2155 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2156 2157 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2158 if (tb[IFLA_EXT_MASK]) 2159 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2160 } 2161 2162 if (!ext_filter_mask) 2163 return NLMSG_GOODSIZE; 2164 /* 2165 * traverse the list of net devices and compute the minimum 2166 * buffer size based upon the filter mask. 2167 */ 2168 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2169 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2170 if_nlmsg_size(dev, 2171 ext_filter_mask)); 2172 } 2173 2174 return min_ifinfo_dump_size; 2175 } 2176 2177 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2178 { 2179 int idx; 2180 int s_idx = cb->family; 2181 2182 if (s_idx == 0) 2183 s_idx = 1; 2184 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2185 int type = cb->nlh->nlmsg_type-RTM_BASE; 2186 if (idx < s_idx || idx == PF_PACKET) 2187 continue; 2188 if (rtnl_msg_handlers[idx] == NULL || 2189 rtnl_msg_handlers[idx][type].dumpit == NULL) 2190 continue; 2191 if (idx > s_idx) { 2192 memset(&cb->args[0], 0, sizeof(cb->args)); 2193 cb->prev_seq = 0; 2194 cb->seq = 0; 2195 } 2196 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2197 break; 2198 } 2199 cb->family = idx; 2200 2201 return skb->len; 2202 } 2203 2204 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2205 gfp_t flags) 2206 { 2207 struct net *net = dev_net(dev); 2208 struct sk_buff *skb; 2209 int err = -ENOBUFS; 2210 size_t if_info_size; 2211 2212 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2213 if (skb == NULL) 2214 goto errout; 2215 2216 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2217 if (err < 0) { 2218 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2219 WARN_ON(err == -EMSGSIZE); 2220 kfree_skb(skb); 2221 goto errout; 2222 } 2223 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2224 return; 2225 errout: 2226 if (err < 0) 2227 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2228 } 2229 EXPORT_SYMBOL(rtmsg_ifinfo); 2230 2231 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2232 struct net_device *dev, 2233 u8 *addr, u32 pid, u32 seq, 2234 int type, unsigned int flags, 2235 int nlflags) 2236 { 2237 struct nlmsghdr *nlh; 2238 struct ndmsg *ndm; 2239 2240 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2241 if (!nlh) 2242 return -EMSGSIZE; 2243 2244 ndm = nlmsg_data(nlh); 2245 ndm->ndm_family = AF_BRIDGE; 2246 ndm->ndm_pad1 = 0; 2247 ndm->ndm_pad2 = 0; 2248 ndm->ndm_flags = flags; 2249 ndm->ndm_type = 0; 2250 ndm->ndm_ifindex = dev->ifindex; 2251 ndm->ndm_state = NUD_PERMANENT; 2252 2253 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2254 goto nla_put_failure; 2255 2256 return nlmsg_end(skb, nlh); 2257 2258 nla_put_failure: 2259 nlmsg_cancel(skb, nlh); 2260 return -EMSGSIZE; 2261 } 2262 2263 static inline size_t rtnl_fdb_nlmsg_size(void) 2264 { 2265 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2266 } 2267 2268 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type) 2269 { 2270 struct net *net = dev_net(dev); 2271 struct sk_buff *skb; 2272 int err = -ENOBUFS; 2273 2274 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2275 if (!skb) 2276 goto errout; 2277 2278 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0); 2279 if (err < 0) { 2280 kfree_skb(skb); 2281 goto errout; 2282 } 2283 2284 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2285 return; 2286 errout: 2287 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2288 } 2289 2290 /** 2291 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2292 */ 2293 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2294 struct nlattr *tb[], 2295 struct net_device *dev, 2296 const unsigned char *addr, 2297 u16 flags) 2298 { 2299 int err = -EINVAL; 2300 2301 /* If aging addresses are supported device will need to 2302 * implement its own handler for this. 2303 */ 2304 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2305 pr_info("%s: FDB only supports static addresses\n", dev->name); 2306 return err; 2307 } 2308 2309 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2310 err = dev_uc_add_excl(dev, addr); 2311 else if (is_multicast_ether_addr(addr)) 2312 err = dev_mc_add_excl(dev, addr); 2313 2314 /* Only return duplicate errors if NLM_F_EXCL is set */ 2315 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2316 err = 0; 2317 2318 return err; 2319 } 2320 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2321 2322 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2323 { 2324 struct net *net = sock_net(skb->sk); 2325 struct ndmsg *ndm; 2326 struct nlattr *tb[NDA_MAX+1]; 2327 struct net_device *dev; 2328 u8 *addr; 2329 int err; 2330 2331 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2332 if (err < 0) 2333 return err; 2334 2335 ndm = nlmsg_data(nlh); 2336 if (ndm->ndm_ifindex == 0) { 2337 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2338 return -EINVAL; 2339 } 2340 2341 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2342 if (dev == NULL) { 2343 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2344 return -ENODEV; 2345 } 2346 2347 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2348 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2349 return -EINVAL; 2350 } 2351 2352 addr = nla_data(tb[NDA_LLADDR]); 2353 2354 err = -EOPNOTSUPP; 2355 2356 /* Support fdb on master device the net/bridge default case */ 2357 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2358 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2359 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2360 const struct net_device_ops *ops = br_dev->netdev_ops; 2361 2362 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags); 2363 if (err) 2364 goto out; 2365 else 2366 ndm->ndm_flags &= ~NTF_MASTER; 2367 } 2368 2369 /* Embedded bridge, macvlan, and any other device support */ 2370 if ((ndm->ndm_flags & NTF_SELF)) { 2371 if (dev->netdev_ops->ndo_fdb_add) 2372 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2373 nlh->nlmsg_flags); 2374 else 2375 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, 2376 nlh->nlmsg_flags); 2377 2378 if (!err) { 2379 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH); 2380 ndm->ndm_flags &= ~NTF_SELF; 2381 } 2382 } 2383 out: 2384 return err; 2385 } 2386 2387 /** 2388 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2389 */ 2390 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2391 struct nlattr *tb[], 2392 struct net_device *dev, 2393 const unsigned char *addr) 2394 { 2395 int err = -EINVAL; 2396 2397 /* If aging addresses are supported device will need to 2398 * implement its own handler for this. 2399 */ 2400 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2401 pr_info("%s: FDB only supports static addresses\n", dev->name); 2402 return err; 2403 } 2404 2405 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2406 err = dev_uc_del(dev, addr); 2407 else if (is_multicast_ether_addr(addr)) 2408 err = dev_mc_del(dev, addr); 2409 2410 return err; 2411 } 2412 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2413 2414 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2415 { 2416 struct net *net = sock_net(skb->sk); 2417 struct ndmsg *ndm; 2418 struct nlattr *tb[NDA_MAX+1]; 2419 struct net_device *dev; 2420 int err = -EINVAL; 2421 __u8 *addr; 2422 2423 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2424 return -EPERM; 2425 2426 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2427 if (err < 0) 2428 return err; 2429 2430 ndm = nlmsg_data(nlh); 2431 if (ndm->ndm_ifindex == 0) { 2432 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2433 return -EINVAL; 2434 } 2435 2436 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2437 if (dev == NULL) { 2438 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2439 return -ENODEV; 2440 } 2441 2442 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2443 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2444 return -EINVAL; 2445 } 2446 2447 addr = nla_data(tb[NDA_LLADDR]); 2448 2449 err = -EOPNOTSUPP; 2450 2451 /* Support fdb on master device the net/bridge default case */ 2452 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2453 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2454 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2455 const struct net_device_ops *ops = br_dev->netdev_ops; 2456 2457 if (ops->ndo_fdb_del) 2458 err = ops->ndo_fdb_del(ndm, tb, dev, addr); 2459 2460 if (err) 2461 goto out; 2462 else 2463 ndm->ndm_flags &= ~NTF_MASTER; 2464 } 2465 2466 /* Embedded bridge, macvlan, and any other device support */ 2467 if (ndm->ndm_flags & NTF_SELF) { 2468 if (dev->netdev_ops->ndo_fdb_del) 2469 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr); 2470 else 2471 err = ndo_dflt_fdb_del(ndm, tb, dev, addr); 2472 2473 if (!err) { 2474 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH); 2475 ndm->ndm_flags &= ~NTF_SELF; 2476 } 2477 } 2478 out: 2479 return err; 2480 } 2481 2482 static int nlmsg_populate_fdb(struct sk_buff *skb, 2483 struct netlink_callback *cb, 2484 struct net_device *dev, 2485 int *idx, 2486 struct netdev_hw_addr_list *list) 2487 { 2488 struct netdev_hw_addr *ha; 2489 int err; 2490 u32 portid, seq; 2491 2492 portid = NETLINK_CB(cb->skb).portid; 2493 seq = cb->nlh->nlmsg_seq; 2494 2495 list_for_each_entry(ha, &list->list, list) { 2496 if (*idx < cb->args[0]) 2497 goto skip; 2498 2499 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 2500 portid, seq, 2501 RTM_NEWNEIGH, NTF_SELF, 2502 NLM_F_MULTI); 2503 if (err < 0) 2504 return err; 2505 skip: 2506 *idx += 1; 2507 } 2508 return 0; 2509 } 2510 2511 /** 2512 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2513 * @nlh: netlink message header 2514 * @dev: netdevice 2515 * 2516 * Default netdevice operation to dump the existing unicast address list. 2517 * Returns number of addresses from list put in skb. 2518 */ 2519 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2520 struct netlink_callback *cb, 2521 struct net_device *dev, 2522 struct net_device *filter_dev, 2523 int idx) 2524 { 2525 int err; 2526 2527 netif_addr_lock_bh(dev); 2528 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2529 if (err) 2530 goto out; 2531 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2532 out: 2533 netif_addr_unlock_bh(dev); 2534 return idx; 2535 } 2536 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2537 2538 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2539 { 2540 struct net_device *dev; 2541 struct nlattr *tb[IFLA_MAX+1]; 2542 struct net_device *bdev = NULL; 2543 struct net_device *br_dev = NULL; 2544 const struct net_device_ops *ops = NULL; 2545 const struct net_device_ops *cops = NULL; 2546 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2547 struct net *net = sock_net(skb->sk); 2548 int brport_idx = 0; 2549 int br_idx = 0; 2550 int idx = 0; 2551 2552 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 2553 ifla_policy) == 0) { 2554 if (tb[IFLA_MASTER]) 2555 br_idx = nla_get_u32(tb[IFLA_MASTER]); 2556 } 2557 2558 brport_idx = ifm->ifi_index; 2559 2560 if (br_idx) { 2561 br_dev = __dev_get_by_index(net, br_idx); 2562 if (!br_dev) 2563 return -ENODEV; 2564 2565 ops = br_dev->netdev_ops; 2566 bdev = br_dev; 2567 } 2568 2569 for_each_netdev(net, dev) { 2570 if (brport_idx && (dev->ifindex != brport_idx)) 2571 continue; 2572 2573 if (!br_idx) { /* user did not specify a specific bridge */ 2574 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2575 br_dev = netdev_master_upper_dev_get(dev); 2576 cops = br_dev->netdev_ops; 2577 } 2578 2579 bdev = dev; 2580 } else { 2581 if (dev != br_dev && 2582 !(dev->priv_flags & IFF_BRIDGE_PORT)) 2583 continue; 2584 2585 if (br_dev != netdev_master_upper_dev_get(dev) && 2586 !(dev->priv_flags & IFF_EBRIDGE)) 2587 continue; 2588 2589 bdev = br_dev; 2590 cops = ops; 2591 } 2592 2593 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2594 if (cops && cops->ndo_fdb_dump) 2595 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 2596 idx); 2597 } 2598 2599 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 2600 if (dev->netdev_ops->ndo_fdb_dump) 2601 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, bdev, dev, 2602 idx); 2603 2604 cops = NULL; 2605 } 2606 2607 cb->args[0] = idx; 2608 return skb->len; 2609 } 2610 2611 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2612 struct net_device *dev, u16 mode) 2613 { 2614 struct nlmsghdr *nlh; 2615 struct ifinfomsg *ifm; 2616 struct nlattr *br_afspec; 2617 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2618 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2619 2620 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI); 2621 if (nlh == NULL) 2622 return -EMSGSIZE; 2623 2624 ifm = nlmsg_data(nlh); 2625 ifm->ifi_family = AF_BRIDGE; 2626 ifm->__ifi_pad = 0; 2627 ifm->ifi_type = dev->type; 2628 ifm->ifi_index = dev->ifindex; 2629 ifm->ifi_flags = dev_get_flags(dev); 2630 ifm->ifi_change = 0; 2631 2632 2633 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2634 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2635 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2636 (br_dev && 2637 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2638 (dev->addr_len && 2639 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2640 (dev->ifindex != dev->iflink && 2641 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 2642 goto nla_put_failure; 2643 2644 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2645 if (!br_afspec) 2646 goto nla_put_failure; 2647 2648 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) || 2649 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2650 nla_nest_cancel(skb, br_afspec); 2651 goto nla_put_failure; 2652 } 2653 nla_nest_end(skb, br_afspec); 2654 2655 return nlmsg_end(skb, nlh); 2656 nla_put_failure: 2657 nlmsg_cancel(skb, nlh); 2658 return -EMSGSIZE; 2659 } 2660 EXPORT_SYMBOL(ndo_dflt_bridge_getlink); 2661 2662 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 2663 { 2664 struct net *net = sock_net(skb->sk); 2665 struct net_device *dev; 2666 int idx = 0; 2667 u32 portid = NETLINK_CB(cb->skb).portid; 2668 u32 seq = cb->nlh->nlmsg_seq; 2669 struct nlattr *extfilt; 2670 u32 filter_mask = 0; 2671 2672 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 2673 IFLA_EXT_MASK); 2674 if (extfilt) 2675 filter_mask = nla_get_u32(extfilt); 2676 2677 rcu_read_lock(); 2678 for_each_netdev_rcu(net, dev) { 2679 const struct net_device_ops *ops = dev->netdev_ops; 2680 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2681 2682 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2683 if (idx >= cb->args[0] && 2684 br_dev->netdev_ops->ndo_bridge_getlink( 2685 skb, portid, seq, dev, filter_mask) < 0) 2686 break; 2687 idx++; 2688 } 2689 2690 if (ops->ndo_bridge_getlink) { 2691 if (idx >= cb->args[0] && 2692 ops->ndo_bridge_getlink(skb, portid, seq, dev, 2693 filter_mask) < 0) 2694 break; 2695 idx++; 2696 } 2697 } 2698 rcu_read_unlock(); 2699 cb->args[0] = idx; 2700 2701 return skb->len; 2702 } 2703 2704 static inline size_t bridge_nlmsg_size(void) 2705 { 2706 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 2707 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 2708 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 2709 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 2710 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 2711 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 2712 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 2713 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 2714 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 2715 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 2716 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 2717 } 2718 2719 static int rtnl_bridge_notify(struct net_device *dev, u16 flags) 2720 { 2721 struct net *net = dev_net(dev); 2722 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2723 struct sk_buff *skb; 2724 int err = -EOPNOTSUPP; 2725 2726 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 2727 if (!skb) { 2728 err = -ENOMEM; 2729 goto errout; 2730 } 2731 2732 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) && 2733 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2734 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2735 if (err < 0) 2736 goto errout; 2737 } 2738 2739 if ((flags & BRIDGE_FLAGS_SELF) && 2740 dev->netdev_ops->ndo_bridge_getlink) { 2741 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2742 if (err < 0) 2743 goto errout; 2744 } 2745 2746 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 2747 return 0; 2748 errout: 2749 WARN_ON(err == -EMSGSIZE); 2750 kfree_skb(skb); 2751 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2752 return err; 2753 } 2754 2755 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2756 { 2757 struct net *net = sock_net(skb->sk); 2758 struct ifinfomsg *ifm; 2759 struct net_device *dev; 2760 struct nlattr *br_spec, *attr = NULL; 2761 int rem, err = -EOPNOTSUPP; 2762 u16 oflags, flags = 0; 2763 bool have_flags = false; 2764 2765 if (nlmsg_len(nlh) < sizeof(*ifm)) 2766 return -EINVAL; 2767 2768 ifm = nlmsg_data(nlh); 2769 if (ifm->ifi_family != AF_BRIDGE) 2770 return -EPFNOSUPPORT; 2771 2772 dev = __dev_get_by_index(net, ifm->ifi_index); 2773 if (!dev) { 2774 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2775 return -ENODEV; 2776 } 2777 2778 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2779 if (br_spec) { 2780 nla_for_each_nested(attr, br_spec, rem) { 2781 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2782 have_flags = true; 2783 flags = nla_get_u16(attr); 2784 break; 2785 } 2786 } 2787 } 2788 2789 oflags = flags; 2790 2791 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2792 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2793 2794 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 2795 err = -EOPNOTSUPP; 2796 goto out; 2797 } 2798 2799 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2800 if (err) 2801 goto out; 2802 2803 flags &= ~BRIDGE_FLAGS_MASTER; 2804 } 2805 2806 if ((flags & BRIDGE_FLAGS_SELF)) { 2807 if (!dev->netdev_ops->ndo_bridge_setlink) 2808 err = -EOPNOTSUPP; 2809 else 2810 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2811 2812 if (!err) 2813 flags &= ~BRIDGE_FLAGS_SELF; 2814 } 2815 2816 if (have_flags) 2817 memcpy(nla_data(attr), &flags, sizeof(flags)); 2818 /* Generate event to notify upper layer of bridge change */ 2819 if (!err) 2820 err = rtnl_bridge_notify(dev, oflags); 2821 out: 2822 return err; 2823 } 2824 2825 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2826 { 2827 struct net *net = sock_net(skb->sk); 2828 struct ifinfomsg *ifm; 2829 struct net_device *dev; 2830 struct nlattr *br_spec, *attr = NULL; 2831 int rem, err = -EOPNOTSUPP; 2832 u16 oflags, flags = 0; 2833 bool have_flags = false; 2834 2835 if (nlmsg_len(nlh) < sizeof(*ifm)) 2836 return -EINVAL; 2837 2838 ifm = nlmsg_data(nlh); 2839 if (ifm->ifi_family != AF_BRIDGE) 2840 return -EPFNOSUPPORT; 2841 2842 dev = __dev_get_by_index(net, ifm->ifi_index); 2843 if (!dev) { 2844 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2845 return -ENODEV; 2846 } 2847 2848 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2849 if (br_spec) { 2850 nla_for_each_nested(attr, br_spec, rem) { 2851 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2852 have_flags = true; 2853 flags = nla_get_u16(attr); 2854 break; 2855 } 2856 } 2857 } 2858 2859 oflags = flags; 2860 2861 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2862 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2863 2864 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 2865 err = -EOPNOTSUPP; 2866 goto out; 2867 } 2868 2869 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2870 if (err) 2871 goto out; 2872 2873 flags &= ~BRIDGE_FLAGS_MASTER; 2874 } 2875 2876 if ((flags & BRIDGE_FLAGS_SELF)) { 2877 if (!dev->netdev_ops->ndo_bridge_dellink) 2878 err = -EOPNOTSUPP; 2879 else 2880 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2881 2882 if (!err) 2883 flags &= ~BRIDGE_FLAGS_SELF; 2884 } 2885 2886 if (have_flags) 2887 memcpy(nla_data(attr), &flags, sizeof(flags)); 2888 /* Generate event to notify upper layer of bridge change */ 2889 if (!err) 2890 err = rtnl_bridge_notify(dev, oflags); 2891 out: 2892 return err; 2893 } 2894 2895 /* Process one rtnetlink message. */ 2896 2897 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2898 { 2899 struct net *net = sock_net(skb->sk); 2900 rtnl_doit_func doit; 2901 int sz_idx, kind; 2902 int family; 2903 int type; 2904 int err; 2905 2906 type = nlh->nlmsg_type; 2907 if (type > RTM_MAX) 2908 return -EOPNOTSUPP; 2909 2910 type -= RTM_BASE; 2911 2912 /* All the messages must have at least 1 byte length */ 2913 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 2914 return 0; 2915 2916 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 2917 sz_idx = type>>2; 2918 kind = type&3; 2919 2920 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 2921 return -EPERM; 2922 2923 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2924 struct sock *rtnl; 2925 rtnl_dumpit_func dumpit; 2926 rtnl_calcit_func calcit; 2927 u16 min_dump_alloc = 0; 2928 2929 dumpit = rtnl_get_dumpit(family, type); 2930 if (dumpit == NULL) 2931 return -EOPNOTSUPP; 2932 calcit = rtnl_get_calcit(family, type); 2933 if (calcit) 2934 min_dump_alloc = calcit(skb, nlh); 2935 2936 __rtnl_unlock(); 2937 rtnl = net->rtnl; 2938 { 2939 struct netlink_dump_control c = { 2940 .dump = dumpit, 2941 .min_dump_alloc = min_dump_alloc, 2942 }; 2943 err = netlink_dump_start(rtnl, skb, nlh, &c); 2944 } 2945 rtnl_lock(); 2946 return err; 2947 } 2948 2949 doit = rtnl_get_doit(family, type); 2950 if (doit == NULL) 2951 return -EOPNOTSUPP; 2952 2953 return doit(skb, nlh); 2954 } 2955 2956 static void rtnetlink_rcv(struct sk_buff *skb) 2957 { 2958 rtnl_lock(); 2959 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2960 rtnl_unlock(); 2961 } 2962 2963 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2964 { 2965 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2966 2967 switch (event) { 2968 case NETDEV_UP: 2969 case NETDEV_DOWN: 2970 case NETDEV_PRE_UP: 2971 case NETDEV_POST_INIT: 2972 case NETDEV_REGISTER: 2973 case NETDEV_CHANGE: 2974 case NETDEV_PRE_TYPE_CHANGE: 2975 case NETDEV_GOING_DOWN: 2976 case NETDEV_UNREGISTER: 2977 case NETDEV_UNREGISTER_FINAL: 2978 case NETDEV_RELEASE: 2979 case NETDEV_JOIN: 2980 break; 2981 default: 2982 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 2983 break; 2984 } 2985 return NOTIFY_DONE; 2986 } 2987 2988 static struct notifier_block rtnetlink_dev_notifier = { 2989 .notifier_call = rtnetlink_event, 2990 }; 2991 2992 2993 static int __net_init rtnetlink_net_init(struct net *net) 2994 { 2995 struct sock *sk; 2996 struct netlink_kernel_cfg cfg = { 2997 .groups = RTNLGRP_MAX, 2998 .input = rtnetlink_rcv, 2999 .cb_mutex = &rtnl_mutex, 3000 .flags = NL_CFG_F_NONROOT_RECV, 3001 }; 3002 3003 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3004 if (!sk) 3005 return -ENOMEM; 3006 net->rtnl = sk; 3007 return 0; 3008 } 3009 3010 static void __net_exit rtnetlink_net_exit(struct net *net) 3011 { 3012 netlink_kernel_release(net->rtnl); 3013 net->rtnl = NULL; 3014 } 3015 3016 static struct pernet_operations rtnetlink_net_ops = { 3017 .init = rtnetlink_net_init, 3018 .exit = rtnetlink_net_exit, 3019 }; 3020 3021 void __init rtnetlink_init(void) 3022 { 3023 if (register_pernet_subsys(&rtnetlink_net_ops)) 3024 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3025 3026 register_netdevice_notifier(&rtnetlink_dev_notifier); 3027 3028 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3029 rtnl_dump_ifinfo, rtnl_calcit); 3030 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3031 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3032 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3033 3034 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3035 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3036 3037 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3038 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3039 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3040 3041 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3042 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3043 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3044 } 3045 3046