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 57struct rtnl_link { 58 rtnl_doit_func doit; 59 rtnl_dumpit_func dumpit; 60 rtnl_calcit_func calcit; 61}; 62 63static DEFINE_MUTEX(rtnl_mutex); 64 65void rtnl_lock(void) 66{ 67 mutex_lock(&rtnl_mutex); 68} 69EXPORT_SYMBOL(rtnl_lock); 70 71void __rtnl_unlock(void) 72{ 73 mutex_unlock(&rtnl_mutex); 74} 75 76void rtnl_unlock(void) 77{ 78 /* This fellow will unlock it for us. */ 79 netdev_run_todo(); 80} 81EXPORT_SYMBOL(rtnl_unlock); 82 83int rtnl_trylock(void) 84{ 85 return mutex_trylock(&rtnl_mutex); 86} 87EXPORT_SYMBOL(rtnl_trylock); 88 89int rtnl_is_locked(void) 90{ 91 return mutex_is_locked(&rtnl_mutex); 92} 93EXPORT_SYMBOL(rtnl_is_locked); 94 95#ifdef CONFIG_PROVE_LOCKING 96int lockdep_rtnl_is_held(void) 97{ 98 return lockdep_is_held(&rtnl_mutex); 99} 100EXPORT_SYMBOL(lockdep_rtnl_is_held); 101#endif /* #ifdef CONFIG_PROVE_LOCKING */ 102 103static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 104 105static 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 119static 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 134static 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 149static 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 */ 182int __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} 212EXPORT_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 */ 223void 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} 232EXPORT_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 */ 241int 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} 256EXPORT_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 */ 265void 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} 272EXPORT_SYMBOL_GPL(rtnl_unregister_all); 273 274static LIST_HEAD(link_ops); 275 276static 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 */ 297int __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} 313EXPORT_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 */ 321int 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} 330EXPORT_SYMBOL_GPL(rtnl_link_register); 331 332static 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 */ 350void __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} 359EXPORT_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 */ 364static 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 */ 393void 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} 402EXPORT_SYMBOL_GPL(rtnl_link_unregister); 403 404static 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 420static 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 445static LIST_HEAD(rtnl_af_ops); 446 447static 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 */ 465void 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} 471EXPORT_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 */ 479void __rtnl_af_unregister(struct rtnl_af_ops *ops) 480{ 481 list_del(&ops->list); 482} 483EXPORT_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 */ 489void rtnl_af_unregister(struct rtnl_af_ops *ops) 490{ 491 rtnl_lock(); 492 __rtnl_af_unregister(ops); 493 rtnl_unlock(); 494} 495EXPORT_SYMBOL_GPL(rtnl_af_unregister); 496 497static 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 516static 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 526static 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 553err_cancel_slave_data: 554 nla_nest_cancel(skb, slave_data); 555 return err; 556} 557 558static 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 585err_cancel_data: 586 nla_nest_cancel(skb, data); 587 return err; 588} 589 590static 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 610err_cancel_link: 611 nla_nest_cancel(skb, linkinfo); 612out: 613 return err; 614} 615 616int 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 630int 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} 636EXPORT_SYMBOL(rtnl_unicast); 637 638void 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} 649EXPORT_SYMBOL(rtnl_notify); 650 651void 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} 657EXPORT_SYMBOL(rtnl_set_sk_err); 658 659int 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 683nla_put_failure: 684 nla_nest_cancel(skb, mx); 685 return -EMSGSIZE; 686} 687EXPORT_SYMBOL(rtnetlink_put_metrics); 688 689int 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} 709EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 710 711static 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 738static 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 744static 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 757static 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 789static 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 */ 795static 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 nla_total_size(sizeof(struct ifla_vf_link_state))); 809 return size; 810 } else 811 return 0; 812} 813 814static size_t rtnl_port_size(const struct net_device *dev, 815 u32 ext_filter_mask) 816{ 817 size_t port_size = nla_total_size(4) /* PORT_VF */ 818 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 819 + nla_total_size(sizeof(struct ifla_port_vsi)) 820 /* PORT_VSI_TYPE */ 821 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 822 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 823 + nla_total_size(1) /* PROT_VDP_REQUEST */ 824 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 825 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 826 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 827 + port_size; 828 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 829 + port_size; 830 831 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 832 !(ext_filter_mask & RTEXT_FILTER_VF)) 833 return 0; 834 if (dev_num_vf(dev->dev.parent)) 835 return port_self_size + vf_ports_size + 836 vf_port_size * dev_num_vf(dev->dev.parent); 837 else 838 return port_self_size; 839} 840 841static noinline size_t if_nlmsg_size(const struct net_device *dev, 842 u32 ext_filter_mask) 843{ 844 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 845 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 846 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 847 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 848 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 849 + nla_total_size(sizeof(struct rtnl_link_stats)) 850 + nla_total_size(sizeof(struct rtnl_link_stats64)) 851 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 852 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 853 + nla_total_size(4) /* IFLA_TXQLEN */ 854 + nla_total_size(4) /* IFLA_WEIGHT */ 855 + nla_total_size(4) /* IFLA_MTU */ 856 + nla_total_size(4) /* IFLA_LINK */ 857 + nla_total_size(4) /* IFLA_MASTER */ 858 + nla_total_size(1) /* IFLA_CARRIER */ 859 + nla_total_size(4) /* IFLA_PROMISCUITY */ 860 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 861 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 862 + nla_total_size(1) /* IFLA_OPERSTATE */ 863 + nla_total_size(1) /* IFLA_LINKMODE */ 864 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ 865 + nla_total_size(ext_filter_mask 866 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 867 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 868 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 869 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 870 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */ 871 + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */ 872} 873 874static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 875{ 876 struct nlattr *vf_ports; 877 struct nlattr *vf_port; 878 int vf; 879 int err; 880 881 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 882 if (!vf_ports) 883 return -EMSGSIZE; 884 885 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 886 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 887 if (!vf_port) 888 goto nla_put_failure; 889 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 890 goto nla_put_failure; 891 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 892 if (err == -EMSGSIZE) 893 goto nla_put_failure; 894 if (err) { 895 nla_nest_cancel(skb, vf_port); 896 continue; 897 } 898 nla_nest_end(skb, vf_port); 899 } 900 901 nla_nest_end(skb, vf_ports); 902 903 return 0; 904 905nla_put_failure: 906 nla_nest_cancel(skb, vf_ports); 907 return -EMSGSIZE; 908} 909 910static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 911{ 912 struct nlattr *port_self; 913 int err; 914 915 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 916 if (!port_self) 917 return -EMSGSIZE; 918 919 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 920 if (err) { 921 nla_nest_cancel(skb, port_self); 922 return (err == -EMSGSIZE) ? err : 0; 923 } 924 925 nla_nest_end(skb, port_self); 926 927 return 0; 928} 929 930static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev, 931 u32 ext_filter_mask) 932{ 933 int err; 934 935 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent || 936 !(ext_filter_mask & RTEXT_FILTER_VF)) 937 return 0; 938 939 err = rtnl_port_self_fill(skb, dev); 940 if (err) 941 return err; 942 943 if (dev_num_vf(dev->dev.parent)) { 944 err = rtnl_vf_ports_fill(skb, dev); 945 if (err) 946 return err; 947 } 948 949 return 0; 950} 951 952static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 953{ 954 int err; 955 struct netdev_phys_port_id ppid; 956 957 err = dev_get_phys_port_id(dev, &ppid); 958 if (err) { 959 if (err == -EOPNOTSUPP) 960 return 0; 961 return err; 962 } 963 964 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 965 return -EMSGSIZE; 966 967 return 0; 968} 969 970static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 971 int type, u32 pid, u32 seq, u32 change, 972 unsigned int flags, u32 ext_filter_mask) 973{ 974 struct ifinfomsg *ifm; 975 struct nlmsghdr *nlh; 976 struct rtnl_link_stats64 temp; 977 const struct rtnl_link_stats64 *stats; 978 struct nlattr *attr, *af_spec; 979 struct rtnl_af_ops *af_ops; 980 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 981 982 ASSERT_RTNL(); 983 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 984 if (nlh == NULL) 985 return -EMSGSIZE; 986 987 ifm = nlmsg_data(nlh); 988 ifm->ifi_family = AF_UNSPEC; 989 ifm->__ifi_pad = 0; 990 ifm->ifi_type = dev->type; 991 ifm->ifi_index = dev->ifindex; 992 ifm->ifi_flags = dev_get_flags(dev); 993 ifm->ifi_change = change; 994 995 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 996 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 997 nla_put_u8(skb, IFLA_OPERSTATE, 998 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 999 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 1000 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 1001 nla_put_u32(skb, IFLA_GROUP, dev->group) || 1002 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 1003 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 1004#ifdef CONFIG_RPS 1005 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 1006#endif 1007 (dev->ifindex != dev->iflink && 1008 nla_put_u32(skb, IFLA_LINK, dev->iflink)) || 1009 (upper_dev && 1010 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 1011 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 1012 (dev->qdisc && 1013 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 1014 (dev->ifalias && 1015 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) || 1016 nla_put_u32(skb, IFLA_CARRIER_CHANGES, 1017 atomic_read(&dev->carrier_changes))) 1018 goto nla_put_failure; 1019 1020 if (1) { 1021 struct rtnl_link_ifmap map = { 1022 .mem_start = dev->mem_start, 1023 .mem_end = dev->mem_end, 1024 .base_addr = dev->base_addr, 1025 .irq = dev->irq, 1026 .dma = dev->dma, 1027 .port = dev->if_port, 1028 }; 1029 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 1030 goto nla_put_failure; 1031 } 1032 1033 if (dev->addr_len) { 1034 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 1035 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 1036 goto nla_put_failure; 1037 } 1038 1039 if (rtnl_phys_port_id_fill(skb, dev)) 1040 goto nla_put_failure; 1041 1042 attr = nla_reserve(skb, IFLA_STATS, 1043 sizeof(struct rtnl_link_stats)); 1044 if (attr == NULL) 1045 goto nla_put_failure; 1046 1047 stats = dev_get_stats(dev, &temp); 1048 copy_rtnl_link_stats(nla_data(attr), stats); 1049 1050 attr = nla_reserve(skb, IFLA_STATS64, 1051 sizeof(struct rtnl_link_stats64)); 1052 if (attr == NULL) 1053 goto nla_put_failure; 1054 copy_rtnl_link_stats64(nla_data(attr), stats); 1055 1056 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 1057 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 1058 goto nla_put_failure; 1059 1060 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 1061 && (ext_filter_mask & RTEXT_FILTER_VF)) { 1062 int i; 1063 1064 struct nlattr *vfinfo, *vf; 1065 int num_vfs = dev_num_vf(dev->dev.parent); 1066 1067 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 1068 if (!vfinfo) 1069 goto nla_put_failure; 1070 for (i = 0; i < num_vfs; i++) { 1071 struct ifla_vf_info ivi; 1072 struct ifla_vf_mac vf_mac; 1073 struct ifla_vf_vlan vf_vlan; 1074 struct ifla_vf_rate vf_rate; 1075 struct ifla_vf_tx_rate vf_tx_rate; 1076 struct ifla_vf_spoofchk vf_spoofchk; 1077 struct ifla_vf_link_state vf_linkstate; 1078 1079 /* 1080 * Not all SR-IOV capable drivers support the 1081 * spoofcheck query. Preset to -1 so the user 1082 * space tool can detect that the driver didn't 1083 * report anything. 1084 */ 1085 ivi.spoofchk = -1; 1086 memset(ivi.mac, 0, sizeof(ivi.mac)); 1087 /* The default value for VF link state is "auto" 1088 * IFLA_VF_LINK_STATE_AUTO which equals zero 1089 */ 1090 ivi.linkstate = 0; 1091 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 1092 break; 1093 vf_mac.vf = 1094 vf_vlan.vf = 1095 vf_rate.vf = 1096 vf_tx_rate.vf = 1097 vf_spoofchk.vf = 1098 vf_linkstate.vf = ivi.vf; 1099 1100 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 1101 vf_vlan.vlan = ivi.vlan; 1102 vf_vlan.qos = ivi.qos; 1103 vf_tx_rate.rate = ivi.max_tx_rate; 1104 vf_rate.min_tx_rate = ivi.min_tx_rate; 1105 vf_rate.max_tx_rate = ivi.max_tx_rate; 1106 vf_spoofchk.setting = ivi.spoofchk; 1107 vf_linkstate.link_state = ivi.linkstate; 1108 vf = nla_nest_start(skb, IFLA_VF_INFO); 1109 if (!vf) { 1110 nla_nest_cancel(skb, vfinfo); 1111 goto nla_put_failure; 1112 } 1113 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1114 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1115 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate), 1116 &vf_rate) || 1117 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1118 &vf_tx_rate) || 1119 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1120 &vf_spoofchk) || 1121 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1122 &vf_linkstate)) 1123 goto nla_put_failure; 1124 nla_nest_end(skb, vf); 1125 } 1126 nla_nest_end(skb, vfinfo); 1127 } 1128 1129 if (rtnl_port_fill(skb, dev, ext_filter_mask)) 1130 goto nla_put_failure; 1131 1132 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) { 1133 if (rtnl_link_fill(skb, dev) < 0) 1134 goto nla_put_failure; 1135 } 1136 1137 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1138 goto nla_put_failure; 1139 1140 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1141 if (af_ops->fill_link_af) { 1142 struct nlattr *af; 1143 int err; 1144 1145 if (!(af = nla_nest_start(skb, af_ops->family))) 1146 goto nla_put_failure; 1147 1148 err = af_ops->fill_link_af(skb, dev); 1149 1150 /* 1151 * Caller may return ENODATA to indicate that there 1152 * was no data to be dumped. This is not an error, it 1153 * means we should trim the attribute header and 1154 * continue. 1155 */ 1156 if (err == -ENODATA) 1157 nla_nest_cancel(skb, af); 1158 else if (err < 0) 1159 goto nla_put_failure; 1160 1161 nla_nest_end(skb, af); 1162 } 1163 } 1164 1165 nla_nest_end(skb, af_spec); 1166 1167 return nlmsg_end(skb, nlh); 1168 1169nla_put_failure: 1170 nlmsg_cancel(skb, nlh); 1171 return -EMSGSIZE; 1172} 1173 1174static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1175 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1176 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1177 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1178 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1179 [IFLA_MTU] = { .type = NLA_U32 }, 1180 [IFLA_LINK] = { .type = NLA_U32 }, 1181 [IFLA_MASTER] = { .type = NLA_U32 }, 1182 [IFLA_CARRIER] = { .type = NLA_U8 }, 1183 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1184 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1185 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1186 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1187 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1188 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1189 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1190 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1191 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1192 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1193 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1194 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1195 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1196 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1197 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1198 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1199 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN }, 1200 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ 1201}; 1202 1203static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1204 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1205 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1206 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING }, 1207 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED }, 1208}; 1209 1210static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1211 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1212}; 1213 1214static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1215 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1216 .len = sizeof(struct ifla_vf_mac) }, 1217 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1218 .len = sizeof(struct ifla_vf_vlan) }, 1219 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1220 .len = sizeof(struct ifla_vf_tx_rate) }, 1221 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY, 1222 .len = sizeof(struct ifla_vf_spoofchk) }, 1223 [IFLA_VF_RATE] = { .type = NLA_BINARY, 1224 .len = sizeof(struct ifla_vf_rate) }, 1225 [IFLA_VF_LINK_STATE] = { .type = NLA_BINARY, 1226 .len = sizeof(struct ifla_vf_link_state) }, 1227}; 1228 1229static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1230 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1231 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1232 .len = PORT_PROFILE_MAX }, 1233 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1234 .len = sizeof(struct ifla_port_vsi)}, 1235 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1236 .len = PORT_UUID_MAX }, 1237 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1238 .len = PORT_UUID_MAX }, 1239 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1240 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1241}; 1242 1243static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1244{ 1245 struct net *net = sock_net(skb->sk); 1246 int h, s_h; 1247 int idx = 0, s_idx; 1248 struct net_device *dev; 1249 struct hlist_head *head; 1250 struct nlattr *tb[IFLA_MAX+1]; 1251 u32 ext_filter_mask = 0; 1252 int err; 1253 int hdrlen; 1254 1255 s_h = cb->args[0]; 1256 s_idx = cb->args[1]; 1257 1258 rcu_read_lock(); 1259 cb->seq = net->dev_base_seq; 1260 1261 /* A hack to preserve kernel<->userspace interface. 1262 * The correct header is ifinfomsg. It is consistent with rtnl_getlink. 1263 * However, before Linux v3.9 the code here assumed rtgenmsg and that's 1264 * what iproute2 < v3.9.0 used. 1265 * We can detect the old iproute2. Even including the IFLA_EXT_MASK 1266 * attribute, its netlink message is shorter than struct ifinfomsg. 1267 */ 1268 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ? 1269 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 1270 1271 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 1272 1273 if (tb[IFLA_EXT_MASK]) 1274 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1275 } 1276 1277 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1278 idx = 0; 1279 head = &net->dev_index_head[h]; 1280 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1281 if (idx < s_idx) 1282 goto cont; 1283 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1284 NETLINK_CB(cb->skb).portid, 1285 cb->nlh->nlmsg_seq, 0, 1286 NLM_F_MULTI, 1287 ext_filter_mask); 1288 /* If we ran out of room on the first message, 1289 * we're in trouble 1290 */ 1291 WARN_ON((err == -EMSGSIZE) && (skb->len == 0)); 1292 1293 if (err <= 0) 1294 goto out; 1295 1296 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1297cont: 1298 idx++; 1299 } 1300 } 1301out: 1302 rcu_read_unlock(); 1303 cb->args[1] = idx; 1304 cb->args[0] = h; 1305 1306 return skb->len; 1307} 1308 1309int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len) 1310{ 1311 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy); 1312} 1313EXPORT_SYMBOL(rtnl_nla_parse_ifla); 1314 1315struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1316{ 1317 struct net *net; 1318 /* Examine the link attributes and figure out which 1319 * network namespace we are talking about. 1320 */ 1321 if (tb[IFLA_NET_NS_PID]) 1322 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1323 else if (tb[IFLA_NET_NS_FD]) 1324 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1325 else 1326 net = get_net(src_net); 1327 return net; 1328} 1329EXPORT_SYMBOL(rtnl_link_get_net); 1330 1331static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1332{ 1333 if (dev) { 1334 if (tb[IFLA_ADDRESS] && 1335 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1336 return -EINVAL; 1337 1338 if (tb[IFLA_BROADCAST] && 1339 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1340 return -EINVAL; 1341 } 1342 1343 if (tb[IFLA_AF_SPEC]) { 1344 struct nlattr *af; 1345 int rem, err; 1346 1347 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1348 const struct rtnl_af_ops *af_ops; 1349 1350 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1351 return -EAFNOSUPPORT; 1352 1353 if (!af_ops->set_link_af) 1354 return -EOPNOTSUPP; 1355 1356 if (af_ops->validate_link_af) { 1357 err = af_ops->validate_link_af(dev, af); 1358 if (err < 0) 1359 return err; 1360 } 1361 } 1362 } 1363 1364 return 0; 1365} 1366 1367static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1368{ 1369 int rem, err = -EINVAL; 1370 struct nlattr *vf; 1371 const struct net_device_ops *ops = dev->netdev_ops; 1372 1373 nla_for_each_nested(vf, attr, rem) { 1374 switch (nla_type(vf)) { 1375 case IFLA_VF_MAC: { 1376 struct ifla_vf_mac *ivm; 1377 ivm = nla_data(vf); 1378 err = -EOPNOTSUPP; 1379 if (ops->ndo_set_vf_mac) 1380 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1381 ivm->mac); 1382 break; 1383 } 1384 case IFLA_VF_VLAN: { 1385 struct ifla_vf_vlan *ivv; 1386 ivv = nla_data(vf); 1387 err = -EOPNOTSUPP; 1388 if (ops->ndo_set_vf_vlan) 1389 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1390 ivv->vlan, 1391 ivv->qos); 1392 break; 1393 } 1394 case IFLA_VF_TX_RATE: { 1395 struct ifla_vf_tx_rate *ivt; 1396 struct ifla_vf_info ivf; 1397 ivt = nla_data(vf); 1398 err = -EOPNOTSUPP; 1399 if (ops->ndo_get_vf_config) 1400 err = ops->ndo_get_vf_config(dev, ivt->vf, 1401 &ivf); 1402 if (err) 1403 break; 1404 err = -EOPNOTSUPP; 1405 if (ops->ndo_set_vf_rate) 1406 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1407 ivf.min_tx_rate, 1408 ivt->rate); 1409 break; 1410 } 1411 case IFLA_VF_RATE: { 1412 struct ifla_vf_rate *ivt; 1413 ivt = nla_data(vf); 1414 err = -EOPNOTSUPP; 1415 if (ops->ndo_set_vf_rate) 1416 err = ops->ndo_set_vf_rate(dev, ivt->vf, 1417 ivt->min_tx_rate, 1418 ivt->max_tx_rate); 1419 break; 1420 } 1421 case IFLA_VF_SPOOFCHK: { 1422 struct ifla_vf_spoofchk *ivs; 1423 ivs = nla_data(vf); 1424 err = -EOPNOTSUPP; 1425 if (ops->ndo_set_vf_spoofchk) 1426 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1427 ivs->setting); 1428 break; 1429 } 1430 case IFLA_VF_LINK_STATE: { 1431 struct ifla_vf_link_state *ivl; 1432 ivl = nla_data(vf); 1433 err = -EOPNOTSUPP; 1434 if (ops->ndo_set_vf_link_state) 1435 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1436 ivl->link_state); 1437 break; 1438 } 1439 default: 1440 err = -EINVAL; 1441 break; 1442 } 1443 if (err) 1444 break; 1445 } 1446 return err; 1447} 1448 1449static int do_set_master(struct net_device *dev, int ifindex) 1450{ 1451 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1452 const struct net_device_ops *ops; 1453 int err; 1454 1455 if (upper_dev) { 1456 if (upper_dev->ifindex == ifindex) 1457 return 0; 1458 ops = upper_dev->netdev_ops; 1459 if (ops->ndo_del_slave) { 1460 err = ops->ndo_del_slave(upper_dev, dev); 1461 if (err) 1462 return err; 1463 } else { 1464 return -EOPNOTSUPP; 1465 } 1466 } 1467 1468 if (ifindex) { 1469 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1470 if (!upper_dev) 1471 return -EINVAL; 1472 ops = upper_dev->netdev_ops; 1473 if (ops->ndo_add_slave) { 1474 err = ops->ndo_add_slave(upper_dev, dev); 1475 if (err) 1476 return err; 1477 } else { 1478 return -EOPNOTSUPP; 1479 } 1480 } 1481 return 0; 1482} 1483 1484#define DO_SETLINK_MODIFIED 0x01 1485/* notify flag means notify + modified. */ 1486#define DO_SETLINK_NOTIFY 0x03 1487static int do_setlink(const struct sk_buff *skb, 1488 struct net_device *dev, struct ifinfomsg *ifm, 1489 struct nlattr **tb, char *ifname, int status) 1490{ 1491 const struct net_device_ops *ops = dev->netdev_ops; 1492 int err; 1493 1494 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1495 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1496 if (IS_ERR(net)) { 1497 err = PTR_ERR(net); 1498 goto errout; 1499 } 1500 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) { 1501 put_net(net); 1502 err = -EPERM; 1503 goto errout; 1504 } 1505 err = dev_change_net_namespace(dev, net, ifname); 1506 put_net(net); 1507 if (err) 1508 goto errout; 1509 status |= DO_SETLINK_MODIFIED; 1510 } 1511 1512 if (tb[IFLA_MAP]) { 1513 struct rtnl_link_ifmap *u_map; 1514 struct ifmap k_map; 1515 1516 if (!ops->ndo_set_config) { 1517 err = -EOPNOTSUPP; 1518 goto errout; 1519 } 1520 1521 if (!netif_device_present(dev)) { 1522 err = -ENODEV; 1523 goto errout; 1524 } 1525 1526 u_map = nla_data(tb[IFLA_MAP]); 1527 k_map.mem_start = (unsigned long) u_map->mem_start; 1528 k_map.mem_end = (unsigned long) u_map->mem_end; 1529 k_map.base_addr = (unsigned short) u_map->base_addr; 1530 k_map.irq = (unsigned char) u_map->irq; 1531 k_map.dma = (unsigned char) u_map->dma; 1532 k_map.port = (unsigned char) u_map->port; 1533 1534 err = ops->ndo_set_config(dev, &k_map); 1535 if (err < 0) 1536 goto errout; 1537 1538 status |= DO_SETLINK_NOTIFY; 1539 } 1540 1541 if (tb[IFLA_ADDRESS]) { 1542 struct sockaddr *sa; 1543 int len; 1544 1545 len = sizeof(sa_family_t) + dev->addr_len; 1546 sa = kmalloc(len, GFP_KERNEL); 1547 if (!sa) { 1548 err = -ENOMEM; 1549 goto errout; 1550 } 1551 sa->sa_family = dev->type; 1552 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1553 dev->addr_len); 1554 err = dev_set_mac_address(dev, sa); 1555 kfree(sa); 1556 if (err) 1557 goto errout; 1558 status |= DO_SETLINK_MODIFIED; 1559 } 1560 1561 if (tb[IFLA_MTU]) { 1562 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1563 if (err < 0) 1564 goto errout; 1565 status |= DO_SETLINK_MODIFIED; 1566 } 1567 1568 if (tb[IFLA_GROUP]) { 1569 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1570 status |= DO_SETLINK_NOTIFY; 1571 } 1572 1573 /* 1574 * Interface selected by interface index but interface 1575 * name provided implies that a name change has been 1576 * requested. 1577 */ 1578 if (ifm->ifi_index > 0 && ifname[0]) { 1579 err = dev_change_name(dev, ifname); 1580 if (err < 0) 1581 goto errout; 1582 status |= DO_SETLINK_MODIFIED; 1583 } 1584 1585 if (tb[IFLA_IFALIAS]) { 1586 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1587 nla_len(tb[IFLA_IFALIAS])); 1588 if (err < 0) 1589 goto errout; 1590 status |= DO_SETLINK_NOTIFY; 1591 } 1592 1593 if (tb[IFLA_BROADCAST]) { 1594 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1595 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1596 } 1597 1598 if (ifm->ifi_flags || ifm->ifi_change) { 1599 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1600 if (err < 0) 1601 goto errout; 1602 } 1603 1604 if (tb[IFLA_MASTER]) { 1605 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1606 if (err) 1607 goto errout; 1608 status |= DO_SETLINK_MODIFIED; 1609 } 1610 1611 if (tb[IFLA_CARRIER]) { 1612 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1613 if (err) 1614 goto errout; 1615 status |= DO_SETLINK_MODIFIED; 1616 } 1617 1618 if (tb[IFLA_TXQLEN]) { 1619 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); 1620 1621 if (dev->tx_queue_len ^ value) 1622 status |= DO_SETLINK_NOTIFY; 1623 1624 dev->tx_queue_len = value; 1625 } 1626 1627 if (tb[IFLA_OPERSTATE]) 1628 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1629 1630 if (tb[IFLA_LINKMODE]) { 1631 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]); 1632 1633 write_lock_bh(&dev_base_lock); 1634 if (dev->link_mode ^ value) 1635 status |= DO_SETLINK_NOTIFY; 1636 dev->link_mode = value; 1637 write_unlock_bh(&dev_base_lock); 1638 } 1639 1640 if (tb[IFLA_VFINFO_LIST]) { 1641 struct nlattr *attr; 1642 int rem; 1643 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1644 if (nla_type(attr) != IFLA_VF_INFO) { 1645 err = -EINVAL; 1646 goto errout; 1647 } 1648 err = do_setvfinfo(dev, attr); 1649 if (err < 0) 1650 goto errout; 1651 status |= DO_SETLINK_NOTIFY; 1652 } 1653 } 1654 err = 0; 1655 1656 if (tb[IFLA_VF_PORTS]) { 1657 struct nlattr *port[IFLA_PORT_MAX+1]; 1658 struct nlattr *attr; 1659 int vf; 1660 int rem; 1661 1662 err = -EOPNOTSUPP; 1663 if (!ops->ndo_set_vf_port) 1664 goto errout; 1665 1666 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1667 if (nla_type(attr) != IFLA_VF_PORT) 1668 continue; 1669 err = nla_parse_nested(port, IFLA_PORT_MAX, 1670 attr, ifla_port_policy); 1671 if (err < 0) 1672 goto errout; 1673 if (!port[IFLA_PORT_VF]) { 1674 err = -EOPNOTSUPP; 1675 goto errout; 1676 } 1677 vf = nla_get_u32(port[IFLA_PORT_VF]); 1678 err = ops->ndo_set_vf_port(dev, vf, port); 1679 if (err < 0) 1680 goto errout; 1681 status |= DO_SETLINK_NOTIFY; 1682 } 1683 } 1684 err = 0; 1685 1686 if (tb[IFLA_PORT_SELF]) { 1687 struct nlattr *port[IFLA_PORT_MAX+1]; 1688 1689 err = nla_parse_nested(port, IFLA_PORT_MAX, 1690 tb[IFLA_PORT_SELF], ifla_port_policy); 1691 if (err < 0) 1692 goto errout; 1693 1694 err = -EOPNOTSUPP; 1695 if (ops->ndo_set_vf_port) 1696 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1697 if (err < 0) 1698 goto errout; 1699 status |= DO_SETLINK_NOTIFY; 1700 } 1701 1702 if (tb[IFLA_AF_SPEC]) { 1703 struct nlattr *af; 1704 int rem; 1705 1706 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1707 const struct rtnl_af_ops *af_ops; 1708 1709 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1710 BUG(); 1711 1712 err = af_ops->set_link_af(dev, af); 1713 if (err < 0) 1714 goto errout; 1715 1716 status |= DO_SETLINK_NOTIFY; 1717 } 1718 } 1719 err = 0; 1720 1721errout: 1722 if (status & DO_SETLINK_MODIFIED) { 1723 if (status & DO_SETLINK_NOTIFY) 1724 netdev_state_change(dev); 1725 1726 if (err < 0) 1727 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", 1728 dev->name); 1729 } 1730 1731 return err; 1732} 1733 1734static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1735{ 1736 struct net *net = sock_net(skb->sk); 1737 struct ifinfomsg *ifm; 1738 struct net_device *dev; 1739 int err; 1740 struct nlattr *tb[IFLA_MAX+1]; 1741 char ifname[IFNAMSIZ]; 1742 1743 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1744 if (err < 0) 1745 goto errout; 1746 1747 if (tb[IFLA_IFNAME]) 1748 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1749 else 1750 ifname[0] = '\0'; 1751 1752 err = -EINVAL; 1753 ifm = nlmsg_data(nlh); 1754 if (ifm->ifi_index > 0) 1755 dev = __dev_get_by_index(net, ifm->ifi_index); 1756 else if (tb[IFLA_IFNAME]) 1757 dev = __dev_get_by_name(net, ifname); 1758 else 1759 goto errout; 1760 1761 if (dev == NULL) { 1762 err = -ENODEV; 1763 goto errout; 1764 } 1765 1766 err = validate_linkmsg(dev, tb); 1767 if (err < 0) 1768 goto errout; 1769 1770 err = do_setlink(skb, dev, ifm, tb, ifname, 0); 1771errout: 1772 return err; 1773} 1774 1775static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1776{ 1777 struct net *net = sock_net(skb->sk); 1778 const struct rtnl_link_ops *ops; 1779 struct net_device *dev; 1780 struct ifinfomsg *ifm; 1781 char ifname[IFNAMSIZ]; 1782 struct nlattr *tb[IFLA_MAX+1]; 1783 int err; 1784 LIST_HEAD(list_kill); 1785 1786 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1787 if (err < 0) 1788 return err; 1789 1790 if (tb[IFLA_IFNAME]) 1791 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1792 1793 ifm = nlmsg_data(nlh); 1794 if (ifm->ifi_index > 0) 1795 dev = __dev_get_by_index(net, ifm->ifi_index); 1796 else if (tb[IFLA_IFNAME]) 1797 dev = __dev_get_by_name(net, ifname); 1798 else 1799 return -EINVAL; 1800 1801 if (!dev) 1802 return -ENODEV; 1803 1804 ops = dev->rtnl_link_ops; 1805 if (!ops || !ops->dellink) 1806 return -EOPNOTSUPP; 1807 1808 ops->dellink(dev, &list_kill); 1809 unregister_netdevice_many(&list_kill); 1810 return 0; 1811} 1812 1813int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1814{ 1815 unsigned int old_flags; 1816 int err; 1817 1818 old_flags = dev->flags; 1819 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1820 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1821 if (err < 0) 1822 return err; 1823 } 1824 1825 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1826 1827 __dev_notify_flags(dev, old_flags, ~0U); 1828 return 0; 1829} 1830EXPORT_SYMBOL(rtnl_configure_link); 1831 1832struct net_device *rtnl_create_link(struct net *net, 1833 char *ifname, unsigned char name_assign_type, 1834 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1835{ 1836 int err; 1837 struct net_device *dev; 1838 unsigned int num_tx_queues = 1; 1839 unsigned int num_rx_queues = 1; 1840 1841 if (tb[IFLA_NUM_TX_QUEUES]) 1842 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1843 else if (ops->get_num_tx_queues) 1844 num_tx_queues = ops->get_num_tx_queues(); 1845 1846 if (tb[IFLA_NUM_RX_QUEUES]) 1847 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1848 else if (ops->get_num_rx_queues) 1849 num_rx_queues = ops->get_num_rx_queues(); 1850 1851 err = -ENOMEM; 1852 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type, 1853 ops->setup, num_tx_queues, num_rx_queues); 1854 if (!dev) 1855 goto err; 1856 1857 dev_net_set(dev, net); 1858 dev->rtnl_link_ops = ops; 1859 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1860 1861 if (tb[IFLA_MTU]) 1862 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1863 if (tb[IFLA_ADDRESS]) { 1864 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1865 nla_len(tb[IFLA_ADDRESS])); 1866 dev->addr_assign_type = NET_ADDR_SET; 1867 } 1868 if (tb[IFLA_BROADCAST]) 1869 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1870 nla_len(tb[IFLA_BROADCAST])); 1871 if (tb[IFLA_TXQLEN]) 1872 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1873 if (tb[IFLA_OPERSTATE]) 1874 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1875 if (tb[IFLA_LINKMODE]) 1876 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1877 if (tb[IFLA_GROUP]) 1878 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1879 1880 return dev; 1881 1882err: 1883 return ERR_PTR(err); 1884} 1885EXPORT_SYMBOL(rtnl_create_link); 1886 1887static int rtnl_group_changelink(const struct sk_buff *skb, 1888 struct net *net, int group, 1889 struct ifinfomsg *ifm, 1890 struct nlattr **tb) 1891{ 1892 struct net_device *dev; 1893 int err; 1894 1895 for_each_netdev(net, dev) { 1896 if (dev->group == group) { 1897 err = do_setlink(skb, dev, ifm, tb, NULL, 0); 1898 if (err < 0) 1899 return err; 1900 } 1901 } 1902 1903 return 0; 1904} 1905 1906static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1907{ 1908 struct net *net = sock_net(skb->sk); 1909 const struct rtnl_link_ops *ops; 1910 const struct rtnl_link_ops *m_ops = NULL; 1911 struct net_device *dev; 1912 struct net_device *master_dev = NULL; 1913 struct ifinfomsg *ifm; 1914 char kind[MODULE_NAME_LEN]; 1915 char ifname[IFNAMSIZ]; 1916 struct nlattr *tb[IFLA_MAX+1]; 1917 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1918 unsigned char name_assign_type = NET_NAME_USER; 1919 int err; 1920 1921#ifdef CONFIG_MODULES 1922replay: 1923#endif 1924 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1925 if (err < 0) 1926 return err; 1927 1928 if (tb[IFLA_IFNAME]) 1929 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1930 else 1931 ifname[0] = '\0'; 1932 1933 ifm = nlmsg_data(nlh); 1934 if (ifm->ifi_index > 0) 1935 dev = __dev_get_by_index(net, ifm->ifi_index); 1936 else { 1937 if (ifname[0]) 1938 dev = __dev_get_by_name(net, ifname); 1939 else 1940 dev = NULL; 1941 } 1942 1943 if (dev) { 1944 master_dev = netdev_master_upper_dev_get(dev); 1945 if (master_dev) 1946 m_ops = master_dev->rtnl_link_ops; 1947 } 1948 1949 err = validate_linkmsg(dev, tb); 1950 if (err < 0) 1951 return err; 1952 1953 if (tb[IFLA_LINKINFO]) { 1954 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1955 tb[IFLA_LINKINFO], ifla_info_policy); 1956 if (err < 0) 1957 return err; 1958 } else 1959 memset(linkinfo, 0, sizeof(linkinfo)); 1960 1961 if (linkinfo[IFLA_INFO_KIND]) { 1962 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1963 ops = rtnl_link_ops_get(kind); 1964 } else { 1965 kind[0] = '\0'; 1966 ops = NULL; 1967 } 1968 1969 if (1) { 1970 struct nlattr *attr[ops ? ops->maxtype + 1 : 0]; 1971 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 0]; 1972 struct nlattr **data = NULL; 1973 struct nlattr **slave_data = NULL; 1974 struct net *dest_net; 1975 1976 if (ops) { 1977 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1978 err = nla_parse_nested(attr, ops->maxtype, 1979 linkinfo[IFLA_INFO_DATA], 1980 ops->policy); 1981 if (err < 0) 1982 return err; 1983 data = attr; 1984 } 1985 if (ops->validate) { 1986 err = ops->validate(tb, data); 1987 if (err < 0) 1988 return err; 1989 } 1990 } 1991 1992 if (m_ops) { 1993 if (m_ops->slave_maxtype && 1994 linkinfo[IFLA_INFO_SLAVE_DATA]) { 1995 err = nla_parse_nested(slave_attr, 1996 m_ops->slave_maxtype, 1997 linkinfo[IFLA_INFO_SLAVE_DATA], 1998 m_ops->slave_policy); 1999 if (err < 0) 2000 return err; 2001 slave_data = slave_attr; 2002 } 2003 if (m_ops->slave_validate) { 2004 err = m_ops->slave_validate(tb, slave_data); 2005 if (err < 0) 2006 return err; 2007 } 2008 } 2009 2010 if (dev) { 2011 int status = 0; 2012 2013 if (nlh->nlmsg_flags & NLM_F_EXCL) 2014 return -EEXIST; 2015 if (nlh->nlmsg_flags & NLM_F_REPLACE) 2016 return -EOPNOTSUPP; 2017 2018 if (linkinfo[IFLA_INFO_DATA]) { 2019 if (!ops || ops != dev->rtnl_link_ops || 2020 !ops->changelink) 2021 return -EOPNOTSUPP; 2022 2023 err = ops->changelink(dev, tb, data); 2024 if (err < 0) 2025 return err; 2026 status |= DO_SETLINK_NOTIFY; 2027 } 2028 2029 if (linkinfo[IFLA_INFO_SLAVE_DATA]) { 2030 if (!m_ops || !m_ops->slave_changelink) 2031 return -EOPNOTSUPP; 2032 2033 err = m_ops->slave_changelink(master_dev, dev, 2034 tb, slave_data); 2035 if (err < 0) 2036 return err; 2037 status |= DO_SETLINK_NOTIFY; 2038 } 2039 2040 return do_setlink(skb, dev, ifm, tb, ifname, status); 2041 } 2042 2043 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 2044 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 2045 return rtnl_group_changelink(skb, net, 2046 nla_get_u32(tb[IFLA_GROUP]), 2047 ifm, tb); 2048 return -ENODEV; 2049 } 2050 2051 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 2052 return -EOPNOTSUPP; 2053 2054 if (!ops) { 2055#ifdef CONFIG_MODULES 2056 if (kind[0]) { 2057 __rtnl_unlock(); 2058 request_module("rtnl-link-%s", kind); 2059 rtnl_lock(); 2060 ops = rtnl_link_ops_get(kind); 2061 if (ops) 2062 goto replay; 2063 } 2064#endif 2065 return -EOPNOTSUPP; 2066 } 2067 2068 if (!ops->setup) 2069 return -EOPNOTSUPP; 2070 2071 if (!ifname[0]) { 2072 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 2073 name_assign_type = NET_NAME_ENUM; 2074 } 2075 2076 dest_net = rtnl_link_get_net(net, tb); 2077 if (IS_ERR(dest_net)) 2078 return PTR_ERR(dest_net); 2079 2080 dev = rtnl_create_link(dest_net, ifname, name_assign_type, ops, tb); 2081 if (IS_ERR(dev)) { 2082 err = PTR_ERR(dev); 2083 goto out; 2084 } 2085 2086 dev->ifindex = ifm->ifi_index; 2087 2088 if (ops->newlink) { 2089 err = ops->newlink(net, dev, tb, data); 2090 /* Drivers should call free_netdev() in ->destructor 2091 * and unregister it on failure after registration 2092 * so that device could be finally freed in rtnl_unlock. 2093 */ 2094 if (err < 0) { 2095 /* If device is not registered at all, free it now */ 2096 if (dev->reg_state == NETREG_UNINITIALIZED) 2097 free_netdev(dev); 2098 goto out; 2099 } 2100 } else { 2101 err = register_netdevice(dev); 2102 if (err < 0) { 2103 free_netdev(dev); 2104 goto out; 2105 } 2106 } 2107 err = rtnl_configure_link(dev, ifm); 2108 if (err < 0) 2109 unregister_netdevice(dev); 2110out: 2111 put_net(dest_net); 2112 return err; 2113 } 2114} 2115 2116static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 2117{ 2118 struct net *net = sock_net(skb->sk); 2119 struct ifinfomsg *ifm; 2120 char ifname[IFNAMSIZ]; 2121 struct nlattr *tb[IFLA_MAX+1]; 2122 struct net_device *dev = NULL; 2123 struct sk_buff *nskb; 2124 int err; 2125 u32 ext_filter_mask = 0; 2126 2127 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 2128 if (err < 0) 2129 return err; 2130 2131 if (tb[IFLA_IFNAME]) 2132 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 2133 2134 if (tb[IFLA_EXT_MASK]) 2135 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2136 2137 ifm = nlmsg_data(nlh); 2138 if (ifm->ifi_index > 0) 2139 dev = __dev_get_by_index(net, ifm->ifi_index); 2140 else if (tb[IFLA_IFNAME]) 2141 dev = __dev_get_by_name(net, ifname); 2142 else 2143 return -EINVAL; 2144 2145 if (dev == NULL) 2146 return -ENODEV; 2147 2148 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 2149 if (nskb == NULL) 2150 return -ENOBUFS; 2151 2152 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 2153 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 2154 if (err < 0) { 2155 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 2156 WARN_ON(err == -EMSGSIZE); 2157 kfree_skb(nskb); 2158 } else 2159 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 2160 2161 return err; 2162} 2163 2164static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 2165{ 2166 struct net *net = sock_net(skb->sk); 2167 struct net_device *dev; 2168 struct nlattr *tb[IFLA_MAX+1]; 2169 u32 ext_filter_mask = 0; 2170 u16 min_ifinfo_dump_size = 0; 2171 int hdrlen; 2172 2173 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */ 2174 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ? 2175 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg); 2176 2177 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) { 2178 if (tb[IFLA_EXT_MASK]) 2179 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 2180 } 2181 2182 if (!ext_filter_mask) 2183 return NLMSG_GOODSIZE; 2184 /* 2185 * traverse the list of net devices and compute the minimum 2186 * buffer size based upon the filter mask. 2187 */ 2188 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 2189 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 2190 if_nlmsg_size(dev, 2191 ext_filter_mask)); 2192 } 2193 2194 return min_ifinfo_dump_size; 2195} 2196 2197static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 2198{ 2199 int idx; 2200 int s_idx = cb->family; 2201 2202 if (s_idx == 0) 2203 s_idx = 1; 2204 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 2205 int type = cb->nlh->nlmsg_type-RTM_BASE; 2206 if (idx < s_idx || idx == PF_PACKET) 2207 continue; 2208 if (rtnl_msg_handlers[idx] == NULL || 2209 rtnl_msg_handlers[idx][type].dumpit == NULL) 2210 continue; 2211 if (idx > s_idx) { 2212 memset(&cb->args[0], 0, sizeof(cb->args)); 2213 cb->prev_seq = 0; 2214 cb->seq = 0; 2215 } 2216 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 2217 break; 2218 } 2219 cb->family = idx; 2220 2221 return skb->len; 2222} 2223 2224void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 2225 gfp_t flags) 2226{ 2227 struct net *net = dev_net(dev); 2228 struct sk_buff *skb; 2229 int err = -ENOBUFS; 2230 size_t if_info_size; 2231 2232 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 2233 if (skb == NULL) 2234 goto errout; 2235 2236 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2237 if (err < 0) { 2238 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2239 WARN_ON(err == -EMSGSIZE); 2240 kfree_skb(skb); 2241 goto errout; 2242 } 2243 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2244 return; 2245errout: 2246 if (err < 0) 2247 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2248} 2249EXPORT_SYMBOL(rtmsg_ifinfo); 2250 2251static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2252 struct net_device *dev, 2253 u8 *addr, u32 pid, u32 seq, 2254 int type, unsigned int flags, 2255 int nlflags) 2256{ 2257 struct nlmsghdr *nlh; 2258 struct ndmsg *ndm; 2259 2260 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags); 2261 if (!nlh) 2262 return -EMSGSIZE; 2263 2264 ndm = nlmsg_data(nlh); 2265 ndm->ndm_family = AF_BRIDGE; 2266 ndm->ndm_pad1 = 0; 2267 ndm->ndm_pad2 = 0; 2268 ndm->ndm_flags = flags; 2269 ndm->ndm_type = 0; 2270 ndm->ndm_ifindex = dev->ifindex; 2271 ndm->ndm_state = NUD_PERMANENT; 2272 2273 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2274 goto nla_put_failure; 2275 2276 return nlmsg_end(skb, nlh); 2277 2278nla_put_failure: 2279 nlmsg_cancel(skb, nlh); 2280 return -EMSGSIZE; 2281} 2282 2283static inline size_t rtnl_fdb_nlmsg_size(void) 2284{ 2285 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2286} 2287 2288static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type) 2289{ 2290 struct net *net = dev_net(dev); 2291 struct sk_buff *skb; 2292 int err = -ENOBUFS; 2293 2294 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2295 if (!skb) 2296 goto errout; 2297 2298 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0); 2299 if (err < 0) { 2300 kfree_skb(skb); 2301 goto errout; 2302 } 2303 2304 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2305 return; 2306errout: 2307 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2308} 2309 2310/** 2311 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2312 */ 2313int ndo_dflt_fdb_add(struct ndmsg *ndm, 2314 struct nlattr *tb[], 2315 struct net_device *dev, 2316 const unsigned char *addr, 2317 u16 flags) 2318{ 2319 int err = -EINVAL; 2320 2321 /* If aging addresses are supported device will need to 2322 * implement its own handler for this. 2323 */ 2324 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2325 pr_info("%s: FDB only supports static addresses\n", dev->name); 2326 return err; 2327 } 2328 2329 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2330 err = dev_uc_add_excl(dev, addr); 2331 else if (is_multicast_ether_addr(addr)) 2332 err = dev_mc_add_excl(dev, addr); 2333 2334 /* Only return duplicate errors if NLM_F_EXCL is set */ 2335 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2336 err = 0; 2337 2338 return err; 2339} 2340EXPORT_SYMBOL(ndo_dflt_fdb_add); 2341 2342static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2343{ 2344 struct net *net = sock_net(skb->sk); 2345 struct ndmsg *ndm; 2346 struct nlattr *tb[NDA_MAX+1]; 2347 struct net_device *dev; 2348 u8 *addr; 2349 int err; 2350 2351 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2352 if (err < 0) 2353 return err; 2354 2355 ndm = nlmsg_data(nlh); 2356 if (ndm->ndm_ifindex == 0) { 2357 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2358 return -EINVAL; 2359 } 2360 2361 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2362 if (dev == NULL) { 2363 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2364 return -ENODEV; 2365 } 2366 2367 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2368 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2369 return -EINVAL; 2370 } 2371 2372 addr = nla_data(tb[NDA_LLADDR]); 2373 2374 err = -EOPNOTSUPP; 2375 2376 /* Support fdb on master device the net/bridge default case */ 2377 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2378 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2379 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2380 const struct net_device_ops *ops = br_dev->netdev_ops; 2381 2382 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags); 2383 if (err) 2384 goto out; 2385 else 2386 ndm->ndm_flags &= ~NTF_MASTER; 2387 } 2388 2389 /* Embedded bridge, macvlan, and any other device support */ 2390 if ((ndm->ndm_flags & NTF_SELF)) { 2391 if (dev->netdev_ops->ndo_fdb_add) 2392 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2393 nlh->nlmsg_flags); 2394 else 2395 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, 2396 nlh->nlmsg_flags); 2397 2398 if (!err) { 2399 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH); 2400 ndm->ndm_flags &= ~NTF_SELF; 2401 } 2402 } 2403out: 2404 return err; 2405} 2406 2407/** 2408 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2409 */ 2410int ndo_dflt_fdb_del(struct ndmsg *ndm, 2411 struct nlattr *tb[], 2412 struct net_device *dev, 2413 const unsigned char *addr) 2414{ 2415 int err = -EINVAL; 2416 2417 /* If aging addresses are supported device will need to 2418 * implement its own handler for this. 2419 */ 2420 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2421 pr_info("%s: FDB only supports static addresses\n", dev->name); 2422 return err; 2423 } 2424 2425 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2426 err = dev_uc_del(dev, addr); 2427 else if (is_multicast_ether_addr(addr)) 2428 err = dev_mc_del(dev, addr); 2429 2430 return err; 2431} 2432EXPORT_SYMBOL(ndo_dflt_fdb_del); 2433 2434static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2435{ 2436 struct net *net = sock_net(skb->sk); 2437 struct ndmsg *ndm; 2438 struct nlattr *tb[NDA_MAX+1]; 2439 struct net_device *dev; 2440 int err = -EINVAL; 2441 __u8 *addr; 2442 2443 if (!netlink_capable(skb, CAP_NET_ADMIN)) 2444 return -EPERM; 2445 2446 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2447 if (err < 0) 2448 return err; 2449 2450 ndm = nlmsg_data(nlh); 2451 if (ndm->ndm_ifindex == 0) { 2452 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2453 return -EINVAL; 2454 } 2455 2456 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2457 if (dev == NULL) { 2458 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2459 return -ENODEV; 2460 } 2461 2462 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2463 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2464 return -EINVAL; 2465 } 2466 2467 addr = nla_data(tb[NDA_LLADDR]); 2468 2469 err = -EOPNOTSUPP; 2470 2471 /* Support fdb on master device the net/bridge default case */ 2472 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2473 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2474 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2475 const struct net_device_ops *ops = br_dev->netdev_ops; 2476 2477 if (ops->ndo_fdb_del) 2478 err = ops->ndo_fdb_del(ndm, tb, dev, addr); 2479 2480 if (err) 2481 goto out; 2482 else 2483 ndm->ndm_flags &= ~NTF_MASTER; 2484 } 2485 2486 /* Embedded bridge, macvlan, and any other device support */ 2487 if (ndm->ndm_flags & NTF_SELF) { 2488 if (dev->netdev_ops->ndo_fdb_del) 2489 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr); 2490 else 2491 err = ndo_dflt_fdb_del(ndm, tb, dev, addr); 2492 2493 if (!err) { 2494 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH); 2495 ndm->ndm_flags &= ~NTF_SELF; 2496 } 2497 } 2498out: 2499 return err; 2500} 2501 2502static int nlmsg_populate_fdb(struct sk_buff *skb, 2503 struct netlink_callback *cb, 2504 struct net_device *dev, 2505 int *idx, 2506 struct netdev_hw_addr_list *list) 2507{ 2508 struct netdev_hw_addr *ha; 2509 int err; 2510 u32 portid, seq; 2511 2512 portid = NETLINK_CB(cb->skb).portid; 2513 seq = cb->nlh->nlmsg_seq; 2514 2515 list_for_each_entry(ha, &list->list, list) { 2516 if (*idx < cb->args[0]) 2517 goto skip; 2518 2519 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 2520 portid, seq, 2521 RTM_NEWNEIGH, NTF_SELF, 2522 NLM_F_MULTI); 2523 if (err < 0) 2524 return err; 2525skip: 2526 *idx += 1; 2527 } 2528 return 0; 2529} 2530 2531/** 2532 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2533 * @nlh: netlink message header 2534 * @dev: netdevice 2535 * 2536 * Default netdevice operation to dump the existing unicast address list. 2537 * Returns number of addresses from list put in skb. 2538 */ 2539int ndo_dflt_fdb_dump(struct sk_buff *skb, 2540 struct netlink_callback *cb, 2541 struct net_device *dev, 2542 struct net_device *filter_dev, 2543 int idx) 2544{ 2545 int err; 2546 2547 netif_addr_lock_bh(dev); 2548 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2549 if (err) 2550 goto out; 2551 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2552out: 2553 netif_addr_unlock_bh(dev); 2554 return idx; 2555} 2556EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2557 2558static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2559{ 2560 struct net_device *dev; 2561 struct nlattr *tb[IFLA_MAX+1]; 2562 struct net_device *bdev = NULL; 2563 struct net_device *br_dev = NULL; 2564 const struct net_device_ops *ops = NULL; 2565 const struct net_device_ops *cops = NULL; 2566 struct ifinfomsg *ifm = nlmsg_data(cb->nlh); 2567 struct net *net = sock_net(skb->sk); 2568 int brport_idx = 0; 2569 int br_idx = 0; 2570 int idx = 0; 2571 2572 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 2573 ifla_policy) == 0) { 2574 if (tb[IFLA_MASTER]) 2575 br_idx = nla_get_u32(tb[IFLA_MASTER]); 2576 } 2577 2578 brport_idx = ifm->ifi_index; 2579 2580 if (br_idx) { 2581 br_dev = __dev_get_by_index(net, br_idx); 2582 if (!br_dev) 2583 return -ENODEV; 2584 2585 ops = br_dev->netdev_ops; 2586 bdev = br_dev; 2587 } 2588 2589 for_each_netdev(net, dev) { 2590 if (brport_idx && (dev->ifindex != brport_idx)) 2591 continue; 2592 2593 if (!br_idx) { /* user did not specify a specific bridge */ 2594 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2595 br_dev = netdev_master_upper_dev_get(dev); 2596 cops = br_dev->netdev_ops; 2597 } 2598 2599 bdev = dev; 2600 } else { 2601 if (dev != br_dev && 2602 !(dev->priv_flags & IFF_BRIDGE_PORT)) 2603 continue; 2604 2605 if (br_dev != netdev_master_upper_dev_get(dev) && 2606 !(dev->priv_flags & IFF_EBRIDGE)) 2607 continue; 2608 2609 bdev = br_dev; 2610 cops = ops; 2611 } 2612 2613 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2614 if (cops && cops->ndo_fdb_dump) 2615 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev, 2616 idx); 2617 } 2618 2619 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 2620 if (dev->netdev_ops->ndo_fdb_dump) 2621 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, bdev, dev, 2622 idx); 2623 2624 cops = NULL; 2625 } 2626 2627 cb->args[0] = idx; 2628 return skb->len; 2629} 2630 2631int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2632 struct net_device *dev, u16 mode) 2633{ 2634 struct nlmsghdr *nlh; 2635 struct ifinfomsg *ifm; 2636 struct nlattr *br_afspec; 2637 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2638 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2639 2640 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI); 2641 if (nlh == NULL) 2642 return -EMSGSIZE; 2643 2644 ifm = nlmsg_data(nlh); 2645 ifm->ifi_family = AF_BRIDGE; 2646 ifm->__ifi_pad = 0; 2647 ifm->ifi_type = dev->type; 2648 ifm->ifi_index = dev->ifindex; 2649 ifm->ifi_flags = dev_get_flags(dev); 2650 ifm->ifi_change = 0; 2651 2652 2653 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2654 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2655 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2656 (br_dev && 2657 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2658 (dev->addr_len && 2659 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2660 (dev->ifindex != dev->iflink && 2661 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 2662 goto nla_put_failure; 2663 2664 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2665 if (!br_afspec) 2666 goto nla_put_failure; 2667 2668 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) || 2669 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2670 nla_nest_cancel(skb, br_afspec); 2671 goto nla_put_failure; 2672 } 2673 nla_nest_end(skb, br_afspec); 2674 2675 return nlmsg_end(skb, nlh); 2676nla_put_failure: 2677 nlmsg_cancel(skb, nlh); 2678 return -EMSGSIZE; 2679} 2680EXPORT_SYMBOL(ndo_dflt_bridge_getlink); 2681 2682static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 2683{ 2684 struct net *net = sock_net(skb->sk); 2685 struct net_device *dev; 2686 int idx = 0; 2687 u32 portid = NETLINK_CB(cb->skb).portid; 2688 u32 seq = cb->nlh->nlmsg_seq; 2689 u32 filter_mask = 0; 2690 2691 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { 2692 struct nlattr *extfilt; 2693 2694 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 2695 IFLA_EXT_MASK); 2696 if (extfilt) { 2697 if (nla_len(extfilt) < sizeof(filter_mask)) 2698 return -EINVAL; 2699 2700 filter_mask = nla_get_u32(extfilt); 2701 } 2702 } 2703 2704 rcu_read_lock(); 2705 for_each_netdev_rcu(net, dev) { 2706 const struct net_device_ops *ops = dev->netdev_ops; 2707 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2708 2709 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2710 if (idx >= cb->args[0] && 2711 br_dev->netdev_ops->ndo_bridge_getlink( 2712 skb, portid, seq, dev, filter_mask) < 0) 2713 break; 2714 idx++; 2715 } 2716 2717 if (ops->ndo_bridge_getlink) { 2718 if (idx >= cb->args[0] && 2719 ops->ndo_bridge_getlink(skb, portid, seq, dev, 2720 filter_mask) < 0) 2721 break; 2722 idx++; 2723 } 2724 } 2725 rcu_read_unlock(); 2726 cb->args[0] = idx; 2727 2728 return skb->len; 2729} 2730 2731static inline size_t bridge_nlmsg_size(void) 2732{ 2733 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 2734 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 2735 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 2736 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 2737 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 2738 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 2739 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 2740 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 2741 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 2742 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 2743 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 2744} 2745 2746static int rtnl_bridge_notify(struct net_device *dev, u16 flags) 2747{ 2748 struct net *net = dev_net(dev); 2749 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2750 struct sk_buff *skb; 2751 int err = -EOPNOTSUPP; 2752 2753 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 2754 if (!skb) { 2755 err = -ENOMEM; 2756 goto errout; 2757 } 2758 2759 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) && 2760 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2761 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2762 if (err < 0) 2763 goto errout; 2764 } 2765 2766 if ((flags & BRIDGE_FLAGS_SELF) && 2767 dev->netdev_ops->ndo_bridge_getlink) { 2768 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2769 if (err < 0) 2770 goto errout; 2771 } 2772 2773 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 2774 return 0; 2775errout: 2776 WARN_ON(err == -EMSGSIZE); 2777 kfree_skb(skb); 2778 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2779 return err; 2780} 2781 2782static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2783{ 2784 struct net *net = sock_net(skb->sk); 2785 struct ifinfomsg *ifm; 2786 struct net_device *dev; 2787 struct nlattr *br_spec, *attr = NULL; 2788 int rem, err = -EOPNOTSUPP; 2789 u16 oflags, flags = 0; 2790 bool have_flags = false; 2791 2792 if (nlmsg_len(nlh) < sizeof(*ifm)) 2793 return -EINVAL; 2794 2795 ifm = nlmsg_data(nlh); 2796 if (ifm->ifi_family != AF_BRIDGE) 2797 return -EPFNOSUPPORT; 2798 2799 dev = __dev_get_by_index(net, ifm->ifi_index); 2800 if (!dev) { 2801 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2802 return -ENODEV; 2803 } 2804 2805 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2806 if (br_spec) { 2807 nla_for_each_nested(attr, br_spec, rem) { 2808 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2809 if (nla_len(attr) < sizeof(flags)) 2810 return -EINVAL; 2811 2812 have_flags = true; 2813 flags = nla_get_u16(attr); 2814 break; 2815 } 2816 } 2817 } 2818 2819 oflags = flags; 2820 2821 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2822 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2823 2824 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 2825 err = -EOPNOTSUPP; 2826 goto out; 2827 } 2828 2829 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2830 if (err) 2831 goto out; 2832 2833 flags &= ~BRIDGE_FLAGS_MASTER; 2834 } 2835 2836 if ((flags & BRIDGE_FLAGS_SELF)) { 2837 if (!dev->netdev_ops->ndo_bridge_setlink) 2838 err = -EOPNOTSUPP; 2839 else 2840 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2841 2842 if (!err) 2843 flags &= ~BRIDGE_FLAGS_SELF; 2844 } 2845 2846 if (have_flags) 2847 memcpy(nla_data(attr), &flags, sizeof(flags)); 2848 /* Generate event to notify upper layer of bridge change */ 2849 if (!err) 2850 err = rtnl_bridge_notify(dev, oflags); 2851out: 2852 return err; 2853} 2854 2855static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2856{ 2857 struct net *net = sock_net(skb->sk); 2858 struct ifinfomsg *ifm; 2859 struct net_device *dev; 2860 struct nlattr *br_spec, *attr = NULL; 2861 int rem, err = -EOPNOTSUPP; 2862 u16 oflags, flags = 0; 2863 bool have_flags = false; 2864 2865 if (nlmsg_len(nlh) < sizeof(*ifm)) 2866 return -EINVAL; 2867 2868 ifm = nlmsg_data(nlh); 2869 if (ifm->ifi_family != AF_BRIDGE) 2870 return -EPFNOSUPPORT; 2871 2872 dev = __dev_get_by_index(net, ifm->ifi_index); 2873 if (!dev) { 2874 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2875 return -ENODEV; 2876 } 2877 2878 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2879 if (br_spec) { 2880 nla_for_each_nested(attr, br_spec, rem) { 2881 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2882 if (nla_len(attr) < sizeof(flags)) 2883 return -EINVAL; 2884 2885 have_flags = true; 2886 flags = nla_get_u16(attr); 2887 break; 2888 } 2889 } 2890 } 2891 2892 oflags = flags; 2893 2894 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2895 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2896 2897 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 2898 err = -EOPNOTSUPP; 2899 goto out; 2900 } 2901 2902 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2903 if (err) 2904 goto out; 2905 2906 flags &= ~BRIDGE_FLAGS_MASTER; 2907 } 2908 2909 if ((flags & BRIDGE_FLAGS_SELF)) { 2910 if (!dev->netdev_ops->ndo_bridge_dellink) 2911 err = -EOPNOTSUPP; 2912 else 2913 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2914 2915 if (!err) 2916 flags &= ~BRIDGE_FLAGS_SELF; 2917 } 2918 2919 if (have_flags) 2920 memcpy(nla_data(attr), &flags, sizeof(flags)); 2921 /* Generate event to notify upper layer of bridge change */ 2922 if (!err) 2923 err = rtnl_bridge_notify(dev, oflags); 2924out: 2925 return err; 2926} 2927 2928/* Process one rtnetlink message. */ 2929 2930static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2931{ 2932 struct net *net = sock_net(skb->sk); 2933 rtnl_doit_func doit; 2934 int sz_idx, kind; 2935 int family; 2936 int type; 2937 int err; 2938 2939 type = nlh->nlmsg_type; 2940 if (type > RTM_MAX) 2941 return -EOPNOTSUPP; 2942 2943 type -= RTM_BASE; 2944 2945 /* All the messages must have at least 1 byte length */ 2946 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 2947 return 0; 2948 2949 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 2950 sz_idx = type>>2; 2951 kind = type&3; 2952 2953 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN)) 2954 return -EPERM; 2955 2956 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2957 struct sock *rtnl; 2958 rtnl_dumpit_func dumpit; 2959 rtnl_calcit_func calcit; 2960 u16 min_dump_alloc = 0; 2961 2962 dumpit = rtnl_get_dumpit(family, type); 2963 if (dumpit == NULL) 2964 return -EOPNOTSUPP; 2965 calcit = rtnl_get_calcit(family, type); 2966 if (calcit) 2967 min_dump_alloc = calcit(skb, nlh); 2968 2969 __rtnl_unlock(); 2970 rtnl = net->rtnl; 2971 { 2972 struct netlink_dump_control c = { 2973 .dump = dumpit, 2974 .min_dump_alloc = min_dump_alloc, 2975 }; 2976 err = netlink_dump_start(rtnl, skb, nlh, &c); 2977 } 2978 rtnl_lock(); 2979 return err; 2980 } 2981 2982 doit = rtnl_get_doit(family, type); 2983 if (doit == NULL) 2984 return -EOPNOTSUPP; 2985 2986 return doit(skb, nlh); 2987} 2988 2989static void rtnetlink_rcv(struct sk_buff *skb) 2990{ 2991 rtnl_lock(); 2992 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2993 rtnl_unlock(); 2994} 2995 2996static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2997{ 2998 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2999 3000 switch (event) { 3001 case NETDEV_UP: 3002 case NETDEV_DOWN: 3003 case NETDEV_PRE_UP: 3004 case NETDEV_POST_INIT: 3005 case NETDEV_REGISTER: 3006 case NETDEV_CHANGE: 3007 case NETDEV_PRE_TYPE_CHANGE: 3008 case NETDEV_GOING_DOWN: 3009 case NETDEV_UNREGISTER: 3010 case NETDEV_UNREGISTER_FINAL: 3011 case NETDEV_RELEASE: 3012 case NETDEV_JOIN: 3013 break; 3014 default: 3015 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 3016 break; 3017 } 3018 return NOTIFY_DONE; 3019} 3020 3021static struct notifier_block rtnetlink_dev_notifier = { 3022 .notifier_call = rtnetlink_event, 3023}; 3024 3025 3026static int __net_init rtnetlink_net_init(struct net *net) 3027{ 3028 struct sock *sk; 3029 struct netlink_kernel_cfg cfg = { 3030 .groups = RTNLGRP_MAX, 3031 .input = rtnetlink_rcv, 3032 .cb_mutex = &rtnl_mutex, 3033 .flags = NL_CFG_F_NONROOT_RECV, 3034 }; 3035 3036 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 3037 if (!sk) 3038 return -ENOMEM; 3039 net->rtnl = sk; 3040 return 0; 3041} 3042 3043static void __net_exit rtnetlink_net_exit(struct net *net) 3044{ 3045 netlink_kernel_release(net->rtnl); 3046 net->rtnl = NULL; 3047} 3048 3049static struct pernet_operations rtnetlink_net_ops = { 3050 .init = rtnetlink_net_init, 3051 .exit = rtnetlink_net_exit, 3052}; 3053 3054void __init rtnetlink_init(void) 3055{ 3056 if (register_pernet_subsys(&rtnetlink_net_ops)) 3057 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 3058 3059 register_netdevice_notifier(&rtnetlink_dev_notifier); 3060 3061 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 3062 rtnl_dump_ifinfo, rtnl_calcit); 3063 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 3064 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 3065 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 3066 3067 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 3068 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 3069 3070 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 3071 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 3072 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 3073 3074 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 3075 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 3076 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 3077} 3078 3079