net/core/rtnetlink.c

   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/bitops.h>
  20 #include <linux/errno.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/kernel.h>
  25 #include <linux/timer.h>
  26 #include <linux/string.h>
  27 #include <linux/sockios.h>
  28 #include <linux/net.h>
  29 #include <linux/fcntl.h>
  30 #include <linux/mm.h>
  31 #include <linux/slab.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/capability.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/init.h>
  36 #include <linux/security.h>
  37 #include <linux/mutex.h>
  38 #include <linux/if_addr.h>
  39 #include <linux/if_bridge.h>
  40 #include <linux/if_vlan.h>
  41 #include <linux/pci.h>
  42 #include <linux/etherdevice.h>
  43 #include <linux/bpf.h>
  44
  45 #include <linux/uaccess.h>
  46
  47 #include <linux/inet.h>
  48 #include <linux/netdevice.h>
  49 #include <net/switchdev.h>
  50 #include <net/ip.h>
  51 #include <net/protocol.h>
  52 #include <net/arp.h>
  53 #include <net/route.h>
  54 #include <net/udp.h>
  55 #include <net/tcp.h>
  56 #include <net/sock.h>
  57 #include <net/pkt_sched.h>
  58 #include <net/fib_rules.h>
  59 #include <net/rtnetlink.h>
  60 #include <net/net_namespace.h>
  61
  62 #define RTNL_MAX_TYPE           48
  63 #define RTNL_SLAVE_MAX_TYPE     36
  64
  65 struct rtnl_link {
  66         rtnl_doit_func          doit;
  67         rtnl_dumpit_func        dumpit;
  68         struct module           *owner;
  69         unsigned int            flags;
  70         struct rcu_head         rcu;
  71 };
  72
  73 static DEFINE_MUTEX(rtnl_mutex);
  74
  75 void rtnl_lock(void)
  76 {
  77         mutex_lock(&rtnl_mutex);
  78 }
  79 EXPORT_SYMBOL(rtnl_lock);
  80
  81 int rtnl_lock_killable(void)
  82 {
  83         return mutex_lock_killable(&rtnl_mutex);
  84 }
  85 EXPORT_SYMBOL(rtnl_lock_killable);
  86
  87 static struct sk_buff *defer_kfree_skb_list;
  88 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
  89 {
  90         if (head && tail) {
  91                 tail->next = defer_kfree_skb_list;
  92                 defer_kfree_skb_list = head;
  93         }
  94 }
  95 EXPORT_SYMBOL(rtnl_kfree_skbs);
  96
  97 void __rtnl_unlock(void)
  98 {
  99         struct sk_buff *head = defer_kfree_skb_list;
 100
 101         defer_kfree_skb_list = NULL;
 102
 103         mutex_unlock(&rtnl_mutex);
 104
 105         while (head) {
 106                 struct sk_buff *next = head->next;
 107
 108                 kfree_skb(head);
 109                 cond_resched();
 110                 head = next;
 111         }
 112 }
 113
 114 void rtnl_unlock(void)
 115 {
 116         /* This fellow will unlock it for us. */
 117         netdev_run_todo();
 118 }
 119 EXPORT_SYMBOL(rtnl_unlock);
 120
 121 int rtnl_trylock(void)
 122 {
 123         return mutex_trylock(&rtnl_mutex);
 124 }
 125 EXPORT_SYMBOL(rtnl_trylock);
 126
 127 int rtnl_is_locked(void)
 128 {
 129         return mutex_is_locked(&rtnl_mutex);
 130 }
 131 EXPORT_SYMBOL(rtnl_is_locked);
 132
 133 #ifdef CONFIG_PROVE_LOCKING
 134 bool lockdep_rtnl_is_held(void)
 135 {
 136         return lockdep_is_held(&rtnl_mutex);
 137 }
 138 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 139 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 140
 141 static struct rtnl_link *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 142
 143 static inline int rtm_msgindex(int msgtype)
 144 {
 145         int msgindex = msgtype - RTM_BASE;
 146
 147         /*
 148          * msgindex < 0 implies someone tried to register a netlink
 149          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 150          * the message type has not been added to linux/rtnetlink.h
 151          */
 152         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 153
 154         return msgindex;
 155 }
 156
 157 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
 158 {
 159         struct rtnl_link **tab;
 160
 161         if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
 162                 protocol = PF_UNSPEC;
 163
 164         tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
 165         if (!tab)
 166                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
 167
 168         return tab[msgtype];
 169 }
 170
 171 static int rtnl_register_internal(struct module *owner,
 172                                   int protocol, int msgtype,
 173                                   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 174                                   unsigned int flags)
 175 {
 176         struct rtnl_link *link, *old;
 177         struct rtnl_link __rcu **tab;
 178         int msgindex;
 179         int ret = -ENOBUFS;
 180
 181         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 182         msgindex = rtm_msgindex(msgtype);
 183
 184         rtnl_lock();
 185         tab = rtnl_msg_handlers[protocol];
 186         if (tab == NULL) {
 187                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
 188                 if (!tab)
 189                         goto unlock;
 190
 191                 /* ensures we see the 0 stores */
 192                 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
 193         }
 194
 195         old = rtnl_dereference(tab[msgindex]);
 196         if (old) {
 197                 link = kmemdup(old, sizeof(*old), GFP_KERNEL);
 198                 if (!link)
 199                         goto unlock;
 200         } else {
 201                 link = kzalloc(sizeof(*link), GFP_KERNEL);
 202                 if (!link)
 203                         goto unlock;
 204         }
 205
 206         WARN_ON(link->owner && link->owner != owner);
 207         link->owner = owner;
 208
 209         WARN_ON(doit && link->doit && link->doit != doit);
 210         if (doit)
 211                 link->doit = doit;
 212         WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
 213         if (dumpit)
 214                 link->dumpit = dumpit;
 215
 216         link->flags |= flags;
 217
 218         /* publish protocol:msgtype */
 219         rcu_assign_pointer(tab[msgindex], link);
 220         ret = 0;
 221         if (old)
 222                 kfree_rcu(old, rcu);
 223 unlock:
 224         rtnl_unlock();
 225         return ret;
 226 }
 227
 228 /**
 229  * rtnl_register_module - Register a rtnetlink message type
 230  *
 231  * @owner: module registering the hook (THIS_MODULE)
 232  * @protocol: Protocol family or PF_UNSPEC
 233  * @msgtype: rtnetlink message type
 234  * @doit: Function pointer called for each request message
 235  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 236  * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
 237  *
 238  * Like rtnl_register, but for use by removable modules.
 239  */
 240 int rtnl_register_module(struct module *owner,
 241                          int protocol, int msgtype,
 242                          rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 243                          unsigned int flags)
 244 {
 245         return rtnl_register_internal(owner, protocol, msgtype,
 246                                       doit, dumpit, flags);
 247 }
 248 EXPORT_SYMBOL_GPL(rtnl_register_module);
 249
 250 /**
 251  * rtnl_register - Register a rtnetlink message type
 252  * @protocol: Protocol family or PF_UNSPEC
 253  * @msgtype: rtnetlink message type
 254  * @doit: Function pointer called for each request message
 255  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 256  * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
 257  *
 258  * Registers the specified function pointers (at least one of them has
 259  * to be non-NULL) to be called whenever a request message for the
 260  * specified protocol family and message type is received.
 261  *
 262  * The special protocol family PF_UNSPEC may be used to define fallback
 263  * function pointers for the case when no entry for the specific protocol
 264  * family exists.
 265  */
 266 void rtnl_register(int protocol, int msgtype,
 267                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 268                    unsigned int flags)
 269 {
 270         int err;
 271
 272         err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
 273                                      flags);
 274         if (err)
 275                 pr_err("Unable to register rtnetlink message handler, "
 276                        "protocol = %d, message type = %d\n", protocol, msgtype);
 277 }
 278
 279 /**
 280  * rtnl_unregister - Unregister a rtnetlink message type
 281  * @protocol: Protocol family or PF_UNSPEC
 282  * @msgtype: rtnetlink message type
 283  *
 284  * Returns 0 on success or a negative error code.
 285  */
 286 int rtnl_unregister(int protocol, int msgtype)
 287 {
 288         struct rtnl_link **tab, *link;
 289         int msgindex;
 290
 291         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 292         msgindex = rtm_msgindex(msgtype);
 293
 294         rtnl_lock();
 295         tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
 296         if (!tab) {
 297                 rtnl_unlock();
 298                 return -ENOENT;
 299         }
 300
 301         link = tab[msgindex];
 302         rcu_assign_pointer(tab[msgindex], NULL);
 303         rtnl_unlock();
 304
 305         kfree_rcu(link, rcu);
 306
 307         return 0;
 308 }
 309 EXPORT_SYMBOL_GPL(rtnl_unregister);
 310
 311 /**
 312  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 313  * @protocol : Protocol family or PF_UNSPEC
 314  *
 315  * Identical to calling rtnl_unregster() for all registered message types
 316  * of a certain protocol family.
 317  */
 318 void rtnl_unregister_all(int protocol)
 319 {
 320         struct rtnl_link **tab, *link;
 321         int msgindex;
 322
 323         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 324
 325         rtnl_lock();
 326         tab = rtnl_msg_handlers[protocol];
 327         if (!tab) {
 328                 rtnl_unlock();
 329                 return;
 330         }
 331         RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
 332         for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
 333                 link = tab[msgindex];
 334                 if (!link)
 335                         continue;
 336
 337                 rcu_assign_pointer(tab[msgindex], NULL);
 338                 kfree_rcu(link, rcu);
 339         }
 340         rtnl_unlock();
 341
 342         synchronize_net();
 343
 344         kfree(tab);
 345 }
 346 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 347
 348 static LIST_HEAD(link_ops);
 349
 350 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 351 {
 352         const struct rtnl_link_ops *ops;
 353
 354         list_for_each_entry(ops, &link_ops, list) {
 355                 if (!strcmp(ops->kind, kind))
 356                         return ops;
 357         }
 358         return NULL;
 359 }
 360
 361 /**
 362  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 363  * @ops: struct rtnl_link_ops * to register
 364  *
 365  * The caller must hold the rtnl_mutex. This function should be used
 366  * by drivers that create devices during module initialization. It
 367  * must be called before registering the devices.
 368  *
 369  * Returns 0 on success or a negative error code.
 370  */
 371 int __rtnl_link_register(struct rtnl_link_ops *ops)
 372 {
 373         if (rtnl_link_ops_get(ops->kind))
 374                 return -EEXIST;
 375
 376         /* The check for setup is here because if ops
 377          * does not have that filled up, it is not possible
 378          * to use the ops for creating device. So do not
 379          * fill up dellink as well. That disables rtnl_dellink.
 380          */
 381         if (ops->setup && !ops->dellink)
 382                 ops->dellink = unregister_netdevice_queue;
 383
 384         list_add_tail(&ops->list, &link_ops);
 385         return 0;
 386 }
 387 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 388
 389 /**
 390  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 391  * @ops: struct rtnl_link_ops * to register
 392  *
 393  * Returns 0 on success or a negative error code.
 394  */
 395 int rtnl_link_register(struct rtnl_link_ops *ops)
 396 {
 397         int err;
 398
 399         /* Sanity-check max sizes to avoid stack buffer overflow. */
 400         if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
 401                     ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
 402                 return -EINVAL;
 403
 404         rtnl_lock();
 405         err = __rtnl_link_register(ops);
 406         rtnl_unlock();
 407         return err;
 408 }
 409 EXPORT_SYMBOL_GPL(rtnl_link_register);
 410
 411 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 412 {
 413         struct net_device *dev;
 414         LIST_HEAD(list_kill);
 415
 416         for_each_netdev(net, dev) {
 417                 if (dev->rtnl_link_ops == ops)
 418                         ops->dellink(dev, &list_kill);
 419         }
 420         unregister_netdevice_many(&list_kill);
 421 }
 422
 423 /**
 424  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 425  * @ops: struct rtnl_link_ops * to unregister
 426  *
 427  * The caller must hold the rtnl_mutex and guarantee net_namespace_list
 428  * integrity (hold pernet_ops_rwsem for writing to close the race
 429  * with setup_net() and cleanup_net()).
 430  */
 431 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 432 {
 433         struct net *net;
 434
 435         for_each_net(net) {
 436                 __rtnl_kill_links(net, ops);
 437         }
 438         list_del(&ops->list);
 439 }
 440 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 441
 442 /* Return with the rtnl_lock held when there are no network
 443  * devices unregistering in any network namespace.
 444  */
 445 static void rtnl_lock_unregistering_all(void)
 446 {
 447         struct net *net;
 448         bool unregistering;
 449         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 450
 451         add_wait_queue(&netdev_unregistering_wq, &wait);
 452         for (;;) {
 453                 unregistering = false;
 454                 rtnl_lock();
 455                 /* We held write locked pernet_ops_rwsem, and parallel
 456                  * setup_net() and cleanup_net() are not possible.
 457                  */
 458                 for_each_net(net) {
 459                         if (net->dev_unreg_count > 0) {
 460                                 unregistering = true;
 461                                 break;
 462                         }
 463                 }
 464                 if (!unregistering)
 465                         break;
 466                 __rtnl_unlock();
 467
 468                 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 469         }
 470         remove_wait_queue(&netdev_unregistering_wq, &wait);
 471 }
 472
 473 /**
 474  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 475  * @ops: struct rtnl_link_ops * to unregister
 476  */
 477 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 478 {
 479         /* Close the race with setup_net() and cleanup_net() */
 480         down_write(&pernet_ops_rwsem);
 481         rtnl_lock_unregistering_all();
 482         __rtnl_link_unregister(ops);
 483         rtnl_unlock();
 484         up_write(&pernet_ops_rwsem);
 485 }
 486 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 487
 488 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 489 {
 490         struct net_device *master_dev;
 491         const struct rtnl_link_ops *ops;
 492         size_t size = 0;
 493
 494         rcu_read_lock();
 495
 496         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 497         if (!master_dev)
 498                 goto out;
 499
 500         ops = master_dev->rtnl_link_ops;
 501         if (!ops || !ops->get_slave_size)
 502                 goto out;
 503         /* IFLA_INFO_SLAVE_DATA + nested data */
 504         size = nla_total_size(sizeof(struct nlattr)) +
 505                ops->get_slave_size(master_dev, dev);
 506
 507 out:
 508         rcu_read_unlock();
 509         return size;
 510 }
 511
 512 static size_t rtnl_link_get_size(const struct net_device *dev)
 513 {
 514         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 515         size_t size;
 516
 517         if (!ops)
 518                 return 0;
 519
 520         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 521                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 522
 523         if (ops->get_size)
 524                 /* IFLA_INFO_DATA + nested data */
 525                 size += nla_total_size(sizeof(struct nlattr)) +
 526                         ops->get_size(dev);
 527
 528         if (ops->get_xstats_size)
 529                 /* IFLA_INFO_XSTATS */
 530                 size += nla_total_size(ops->get_xstats_size(dev));
 531
 532         size += rtnl_link_get_slave_info_data_size(dev);
 533
 534         return size;
 535 }
 536
 537 static LIST_HEAD(rtnl_af_ops);
 538
 539 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 540 {
 541         const struct rtnl_af_ops *ops;
 542
 543         list_for_each_entry_rcu(ops, &rtnl_af_ops, list) {
 544                 if (ops->family == family)
 545                         return ops;
 546         }
 547
 548         return NULL;
 549 }
 550
 551 /**
 552  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 553  * @ops: struct rtnl_af_ops * to register
 554  *
 555  * Returns 0 on success or a negative error code.
 556  */
 557 void rtnl_af_register(struct rtnl_af_ops *ops)
 558 {
 559         rtnl_lock();
 560         list_add_tail_rcu(&ops->list, &rtnl_af_ops);
 561         rtnl_unlock();
 562 }
 563 EXPORT_SYMBOL_GPL(rtnl_af_register);
 564
 565 /**
 566  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 567  * @ops: struct rtnl_af_ops * to unregister
 568  */
 569 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 570 {
 571         rtnl_lock();
 572         list_del_rcu(&ops->list);
 573         rtnl_unlock();
 574
 575         synchronize_rcu();
 576 }
 577 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 578
 579 static size_t rtnl_link_get_af_size(const struct net_device *dev,
 580                                     u32 ext_filter_mask)
 581 {
 582         struct rtnl_af_ops *af_ops;
 583         size_t size;
 584
 585         /* IFLA_AF_SPEC */
 586         size = nla_total_size(sizeof(struct nlattr));
 587
 588         rcu_read_lock();
 589         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
 590                 if (af_ops->get_link_af_size) {
 591                         /* AF_* + nested data */
 592                         size += nla_total_size(sizeof(struct nlattr)) +
 593                                 af_ops->get_link_af_size(dev, ext_filter_mask);
 594                 }
 595         }
 596         rcu_read_unlock();
 597
 598         return size;
 599 }
 600
 601 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 602 {
 603         struct net_device *master_dev;
 604         bool ret = false;
 605
 606         rcu_read_lock();
 607
 608         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 609         if (master_dev && master_dev->rtnl_link_ops)
 610                 ret = true;
 611         rcu_read_unlock();
 612         return ret;
 613 }
 614
 615 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 616                                      const struct net_device *dev)
 617 {
 618         struct net_device *master_dev;
 619         const struct rtnl_link_ops *ops;
 620         struct nlattr *slave_data;
 621         int err;
 622
 623         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 624         if (!master_dev)
 625                 return 0;
 626         ops = master_dev->rtnl_link_ops;
 627         if (!ops)
 628                 return 0;
 629         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 630                 return -EMSGSIZE;
 631         if (ops->fill_slave_info) {
 632                 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
 633                 if (!slave_data)
 634                         return -EMSGSIZE;
 635                 err = ops->fill_slave_info(skb, master_dev, dev);
 636                 if (err < 0)
 637                         goto err_cancel_slave_data;
 638                 nla_nest_end(skb, slave_data);
 639         }
 640         return 0;
 641
 642 err_cancel_slave_data:
 643         nla_nest_cancel(skb, slave_data);
 644         return err;
 645 }
 646
 647 static int rtnl_link_info_fill(struct sk_buff *skb,
 648                                const struct net_device *dev)
 649 {
 650         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 651         struct nlattr *data;
 652         int err;
 653
 654         if (!ops)
 655                 return 0;
 656         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 657                 return -EMSGSIZE;
 658         if (ops->fill_xstats) {
 659                 err = ops->fill_xstats(skb, dev);
 660                 if (err < 0)
 661                         return err;
 662         }
 663         if (ops->fill_info) {
 664                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 665                 if (data == NULL)
 666                         return -EMSGSIZE;
 667                 err = ops->fill_info(skb, dev);
 668                 if (err < 0)
 669                         goto err_cancel_data;
 670                 nla_nest_end(skb, data);
 671         }
 672         return 0;
 673
 674 err_cancel_data:
 675         nla_nest_cancel(skb, data);
 676         return err;
 677 }
 678
 679 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 680 {
 681         struct nlattr *linkinfo;
 682         int err = -EMSGSIZE;
 683
 684         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 685         if (linkinfo == NULL)
 686                 goto out;
 687
 688         err = rtnl_link_info_fill(skb, dev);
 689         if (err < 0)
 690                 goto err_cancel_link;
 691
 692         err = rtnl_link_slave_info_fill(skb, dev);
 693         if (err < 0)
 694                 goto err_cancel_link;
 695
 696         nla_nest_end(skb, linkinfo);
 697         return 0;
 698
 699 err_cancel_link:
 700         nla_nest_cancel(skb, linkinfo);
 701 out:
 702         return err;
 703 }
 704
 705 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 706 {
 707         struct sock *rtnl = net->rtnl;
 708         int err = 0;
 709
 710         NETLINK_CB(skb).dst_group = group;
 711         if (echo)
 712                 refcount_inc(&skb->users);
 713         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 714         if (echo)
 715                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 716         return err;
 717 }
 718
 719 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 720 {
 721         struct sock *rtnl = net->rtnl;
 722
 723         return nlmsg_unicast(rtnl, skb, pid);
 724 }
 725 EXPORT_SYMBOL(rtnl_unicast);
 726
 727 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 728                  struct nlmsghdr *nlh, gfp_t flags)
 729 {
 730         struct sock *rtnl = net->rtnl;
 731         int report = 0;
 732
 733         if (nlh)
 734                 report = nlmsg_report(nlh);
 735
 736         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 737 }
 738 EXPORT_SYMBOL(rtnl_notify);
 739
 740 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 741 {
 742         struct sock *rtnl = net->rtnl;
 743
 744         netlink_set_err(rtnl, 0, group, error);
 745 }
 746 EXPORT_SYMBOL(rtnl_set_sk_err);
 747
 748 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 749 {
 750         struct nlattr *mx;
 751         int i, valid = 0;
 752
 753         mx = nla_nest_start(skb, RTA_METRICS);
 754         if (mx == NULL)
 755                 return -ENOBUFS;
 756
 757         for (i = 0; i < RTAX_MAX; i++) {
 758                 if (metrics[i]) {
 759                         if (i == RTAX_CC_ALGO - 1) {
 760                                 char tmp[TCP_CA_NAME_MAX], *name;
 761
 762                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 763                                 if (!name)
 764                                         continue;
 765                                 if (nla_put_string(skb, i + 1, name))
 766                                         goto nla_put_failure;
 767                         } else if (i == RTAX_FEATURES - 1) {
 768                                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 769
 770                                 if (!user_features)
 771                                         continue;
 772                                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 773                                 if (nla_put_u32(skb, i + 1, user_features))
 774                                         goto nla_put_failure;
 775                         } else {
 776                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 777                                         goto nla_put_failure;
 778                         }
 779                         valid++;
 780                 }
 781         }
 782
 783         if (!valid) {
 784                 nla_nest_cancel(skb, mx);
 785                 return 0;
 786         }
 787
 788         return nla_nest_end(skb, mx);
 789
 790 nla_put_failure:
 791         nla_nest_cancel(skb, mx);
 792         return -EMSGSIZE;
 793 }
 794 EXPORT_SYMBOL(rtnetlink_put_metrics);
 795
 796 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 797                        long expires, u32 error)
 798 {
 799         struct rta_cacheinfo ci = {
 800                 .rta_error = error,
 801                 .rta_id =  id,
 802         };
 803
 804         if (dst) {
 805                 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
 806                 ci.rta_used = dst->__use;
 807                 ci.rta_clntref = atomic_read(&dst->__refcnt);
 808         }
 809         if (expires) {
 810                 unsigned long clock;
 811
 812                 clock = jiffies_to_clock_t(abs(expires));
 813                 clock = min_t(unsigned long, clock, INT_MAX);
 814                 ci.rta_expires = (expires > 0) ? clock : -clock;
 815         }
 816         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 817 }
 818 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 819
 820 static void set_operstate(struct net_device *dev, unsigned char transition)
 821 {
 822         unsigned char operstate = dev->operstate;
 823
 824         switch (transition) {
 825         case IF_OPER_UP:
 826                 if ((operstate == IF_OPER_DORMANT ||
 827                      operstate == IF_OPER_UNKNOWN) &&
 828                     !netif_dormant(dev))
 829                         operstate = IF_OPER_UP;
 830                 break;
 831
 832         case IF_OPER_DORMANT:
 833                 if (operstate == IF_OPER_UP ||
 834                     operstate == IF_OPER_UNKNOWN)
 835                         operstate = IF_OPER_DORMANT;
 836                 break;
 837         }
 838
 839         if (dev->operstate != operstate) {
 840                 write_lock_bh(&dev_base_lock);
 841                 dev->operstate = operstate;
 842                 write_unlock_bh(&dev_base_lock);
 843                 netdev_state_change(dev);
 844         }
 845 }
 846
 847 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 848 {
 849         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 850                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 851 }
 852
 853 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 854                                            const struct ifinfomsg *ifm)
 855 {
 856         unsigned int flags = ifm->ifi_flags;
 857
 858         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 859         if (ifm->ifi_change)
 860                 flags = (flags & ifm->ifi_change) |
 861                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 862
 863         return flags;
 864 }
 865
 866 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 867                                  const struct rtnl_link_stats64 *b)
 868 {
 869         a->rx_packets = b->rx_packets;
 870         a->tx_packets = b->tx_packets;
 871         a->rx_bytes = b->rx_bytes;
 872         a->tx_bytes = b->tx_bytes;
 873         a->rx_errors = b->rx_errors;
 874         a->tx_errors = b->tx_errors;
 875         a->rx_dropped = b->rx_dropped;
 876         a->tx_dropped = b->tx_dropped;
 877
 878         a->multicast = b->multicast;
 879         a->collisions = b->collisions;
 880
 881         a->rx_length_errors = b->rx_length_errors;
 882         a->rx_over_errors = b->rx_over_errors;
 883         a->rx_crc_errors = b->rx_crc_errors;
 884         a->rx_frame_errors = b->rx_frame_errors;
 885         a->rx_fifo_errors = b->rx_fifo_errors;
 886         a->rx_missed_errors = b->rx_missed_errors;
 887
 888         a->tx_aborted_errors = b->tx_aborted_errors;
 889         a->tx_carrier_errors = b->tx_carrier_errors;
 890         a->tx_fifo_errors = b->tx_fifo_errors;
 891         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 892         a->tx_window_errors = b->tx_window_errors;
 893
 894         a->rx_compressed = b->rx_compressed;
 895         a->tx_compressed = b->tx_compressed;
 896
 897         a->rx_nohandler = b->rx_nohandler;
 898 }
 899
 900 /* All VF info */
 901 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 902                                    u32 ext_filter_mask)
 903 {
 904         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
 905                 int num_vfs = dev_num_vf(dev->dev.parent);
 906                 size_t size = nla_total_size(0);
 907                 size += num_vfs *
 908                         (nla_total_size(0) +
 909                          nla_total_size(sizeof(struct ifla_vf_mac)) +
 910                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 911                          nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
 912                          nla_total_size(MAX_VLAN_LIST_LEN *
 913                                         sizeof(struct ifla_vf_vlan_info)) +
 914                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 915                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 916                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 917                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 918                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 919                          nla_total_size(0) + /* nest IFLA_VF_STATS */
 920                          /* IFLA_VF_STATS_RX_PACKETS */
 921                          nla_total_size_64bit(sizeof(__u64)) +
 922                          /* IFLA_VF_STATS_TX_PACKETS */
 923                          nla_total_size_64bit(sizeof(__u64)) +
 924                          /* IFLA_VF_STATS_RX_BYTES */
 925                          nla_total_size_64bit(sizeof(__u64)) +
 926                          /* IFLA_VF_STATS_TX_BYTES */
 927                          nla_total_size_64bit(sizeof(__u64)) +
 928                          /* IFLA_VF_STATS_BROADCAST */
 929                          nla_total_size_64bit(sizeof(__u64)) +
 930                          /* IFLA_VF_STATS_MULTICAST */
 931                          nla_total_size_64bit(sizeof(__u64)) +
 932                          /* IFLA_VF_STATS_RX_DROPPED */
 933                          nla_total_size_64bit(sizeof(__u64)) +
 934                          /* IFLA_VF_STATS_TX_DROPPED */
 935                          nla_total_size_64bit(sizeof(__u64)) +
 936                          nla_total_size(sizeof(struct ifla_vf_trust)));
 937                 return size;
 938         } else
 939                 return 0;
 940 }
 941
 942 static size_t rtnl_port_size(const struct net_device *dev,
 943                              u32 ext_filter_mask)
 944 {
 945         size_t port_size = nla_total_size(4)            /* PORT_VF */
 946                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 947                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 948                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 949                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 950                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 951         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 952         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 953                 + port_size;
 954         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 955                 + port_size;
 956
 957         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 958             !(ext_filter_mask & RTEXT_FILTER_VF))
 959                 return 0;
 960         if (dev_num_vf(dev->dev.parent))
 961                 return port_self_size + vf_ports_size +
 962                         vf_port_size * dev_num_vf(dev->dev.parent);
 963         else
 964                 return port_self_size;
 965 }
 966
 967 static size_t rtnl_xdp_size(void)
 968 {
 969         size_t xdp_size = nla_total_size(0) +   /* nest IFLA_XDP */
 970                           nla_total_size(1) +   /* XDP_ATTACHED */
 971                           nla_total_size(4) +   /* XDP_PROG_ID (or 1st mode) */
 972                           nla_total_size(4);    /* XDP_<mode>_PROG_ID */
 973
 974         return xdp_size;
 975 }
 976
 977 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 978                                      u32 ext_filter_mask)
 979 {
 980         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 981                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 982                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 983                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 984                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
 985                + nla_total_size(sizeof(struct rtnl_link_stats))
 986                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
 987                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 988                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 989                + nla_total_size(4) /* IFLA_TXQLEN */
 990                + nla_total_size(4) /* IFLA_WEIGHT */
 991                + nla_total_size(4) /* IFLA_MTU */
 992                + nla_total_size(4) /* IFLA_LINK */
 993                + nla_total_size(4) /* IFLA_MASTER */
 994                + nla_total_size(1) /* IFLA_CARRIER */
 995                + nla_total_size(4) /* IFLA_PROMISCUITY */
 996                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
 997                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 998                + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
 999                + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1000                + nla_total_size(1) /* IFLA_OPERSTATE */
1001                + nla_total_size(1) /* IFLA_LINKMODE */
1002                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1003                + nla_total_size(4) /* IFLA_LINK_NETNSID */
1004                + nla_total_size(4) /* IFLA_GROUP */
1005                + nla_total_size(ext_filter_mask
1006                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1007                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1008                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1009                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1010                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1011                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1012                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1013                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1014                + rtnl_xdp_size() /* IFLA_XDP */
1015                + nla_total_size(4)  /* IFLA_EVENT */
1016                + nla_total_size(4)  /* IFLA_NEW_NETNSID */
1017                + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
1018                + nla_total_size(1)  /* IFLA_PROTO_DOWN */
1019                + nla_total_size(4)  /* IFLA_IF_NETNSID */
1020                + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
1021                + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
1022                + nla_total_size(4)  /* IFLA_MIN_MTU */
1023                + nla_total_size(4)  /* IFLA_MAX_MTU */
1024                + 0;
1025 }
1026
1027 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1028 {
1029         struct nlattr *vf_ports;
1030         struct nlattr *vf_port;
1031         int vf;
1032         int err;
1033
1034         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
1035         if (!vf_ports)
1036                 return -EMSGSIZE;
1037
1038         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1039                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
1040                 if (!vf_port)
1041                         goto nla_put_failure;
1042                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1043                         goto nla_put_failure;
1044                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1045                 if (err == -EMSGSIZE)
1046                         goto nla_put_failure;
1047                 if (err) {
1048                         nla_nest_cancel(skb, vf_port);
1049                         continue;
1050                 }
1051                 nla_nest_end(skb, vf_port);
1052         }
1053
1054         nla_nest_end(skb, vf_ports);
1055
1056         return 0;
1057
1058 nla_put_failure:
1059         nla_nest_cancel(skb, vf_ports);
1060         return -EMSGSIZE;
1061 }
1062
1063 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1064 {
1065         struct nlattr *port_self;
1066         int err;
1067
1068         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
1069         if (!port_self)
1070                 return -EMSGSIZE;
1071
1072         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1073         if (err) {
1074                 nla_nest_cancel(skb, port_self);
1075                 return (err == -EMSGSIZE) ? err : 0;
1076         }
1077
1078         nla_nest_end(skb, port_self);
1079
1080         return 0;
1081 }
1082
1083 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1084                           u32 ext_filter_mask)
1085 {
1086         int err;
1087
1088         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1089             !(ext_filter_mask & RTEXT_FILTER_VF))
1090                 return 0;
1091
1092         err = rtnl_port_self_fill(skb, dev);
1093         if (err)
1094                 return err;
1095
1096         if (dev_num_vf(dev->dev.parent)) {
1097                 err = rtnl_vf_ports_fill(skb, dev);
1098                 if (err)
1099                         return err;
1100         }
1101
1102         return 0;
1103 }
1104
1105 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1106 {
1107         int err;
1108         struct netdev_phys_item_id ppid;
1109
1110         err = dev_get_phys_port_id(dev, &ppid);
1111         if (err) {
1112                 if (err == -EOPNOTSUPP)
1113                         return 0;
1114                 return err;
1115         }
1116
1117         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1118                 return -EMSGSIZE;
1119
1120         return 0;
1121 }
1122
1123 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1124 {
1125         char name[IFNAMSIZ];
1126         int err;
1127
1128         err = dev_get_phys_port_name(dev, name, sizeof(name));
1129         if (err) {
1130                 if (err == -EOPNOTSUPP)
1131                         return 0;
1132                 return err;
1133         }
1134
1135         if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1136                 return -EMSGSIZE;
1137
1138         return 0;
1139 }
1140
1141 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1142 {
1143         int err;
1144         struct switchdev_attr attr = {
1145                 .orig_dev = dev,
1146                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1147                 .flags = SWITCHDEV_F_NO_RECURSE,
1148         };
1149
1150         err = switchdev_port_attr_get(dev, &attr);
1151         if (err) {
1152                 if (err == -EOPNOTSUPP)
1153                         return 0;
1154                 return err;
1155         }
1156
1157         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1158                     attr.u.ppid.id))
1159                 return -EMSGSIZE;
1160
1161         return 0;
1162 }
1163
1164 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1165                                               struct net_device *dev)
1166 {
1167         struct rtnl_link_stats64 *sp;
1168         struct nlattr *attr;
1169
1170         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1171                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1172         if (!attr)
1173                 return -EMSGSIZE;
1174
1175         sp = nla_data(attr);
1176         dev_get_stats(dev, sp);
1177
1178         attr = nla_reserve(skb, IFLA_STATS,
1179                            sizeof(struct rtnl_link_stats));
1180         if (!attr)
1181                 return -EMSGSIZE;
1182
1183         copy_rtnl_link_stats(nla_data(attr), sp);
1184
1185         return 0;
1186 }
1187
1188 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1189                                                struct net_device *dev,
1190                                                int vfs_num,
1191                                                struct nlattr *vfinfo)
1192 {
1193         struct ifla_vf_rss_query_en vf_rss_query_en;
1194         struct nlattr *vf, *vfstats, *vfvlanlist;
1195         struct ifla_vf_link_state vf_linkstate;
1196         struct ifla_vf_vlan_info vf_vlan_info;
1197         struct ifla_vf_spoofchk vf_spoofchk;
1198         struct ifla_vf_tx_rate vf_tx_rate;
1199         struct ifla_vf_stats vf_stats;
1200         struct ifla_vf_trust vf_trust;
1201         struct ifla_vf_vlan vf_vlan;
1202         struct ifla_vf_rate vf_rate;
1203         struct ifla_vf_mac vf_mac;
1204         struct ifla_vf_info ivi;
1205
1206         memset(&ivi, 0, sizeof(ivi));
1207
1208         /* Not all SR-IOV capable drivers support the
1209          * spoofcheck and "RSS query enable" query.  Preset to
1210          * -1 so the user space tool can detect that the driver
1211          * didn't report anything.
1212          */
1213         ivi.spoofchk = -1;
1214         ivi.rss_query_en = -1;
1215         ivi.trusted = -1;
1216         /* The default value for VF link state is "auto"
1217          * IFLA_VF_LINK_STATE_AUTO which equals zero
1218          */
1219         ivi.linkstate = 0;
1220         /* VLAN Protocol by default is 802.1Q */
1221         ivi.vlan_proto = htons(ETH_P_8021Q);
1222         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1223                 return 0;
1224
1225         memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1226
1227         vf_mac.vf =
1228                 vf_vlan.vf =
1229                 vf_vlan_info.vf =
1230                 vf_rate.vf =
1231                 vf_tx_rate.vf =
1232                 vf_spoofchk.vf =
1233                 vf_linkstate.vf =
1234                 vf_rss_query_en.vf =
1235                 vf_trust.vf = ivi.vf;
1236
1237         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1238         vf_vlan.vlan = ivi.vlan;
1239         vf_vlan.qos = ivi.qos;
1240         vf_vlan_info.vlan = ivi.vlan;
1241         vf_vlan_info.qos = ivi.qos;
1242         vf_vlan_info.vlan_proto = ivi.vlan_proto;
1243         vf_tx_rate.rate = ivi.max_tx_rate;
1244         vf_rate.min_tx_rate = ivi.min_tx_rate;
1245         vf_rate.max_tx_rate = ivi.max_tx_rate;
1246         vf_spoofchk.setting = ivi.spoofchk;
1247         vf_linkstate.link_state = ivi.linkstate;
1248         vf_rss_query_en.setting = ivi.rss_query_en;
1249         vf_trust.setting = ivi.trusted;
1250         vf = nla_nest_start(skb, IFLA_VF_INFO);
1251         if (!vf)
1252                 goto nla_put_vfinfo_failure;
1253         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1254             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1255             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1256                     &vf_rate) ||
1257             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1258                     &vf_tx_rate) ||
1259             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1260                     &vf_spoofchk) ||
1261             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1262                     &vf_linkstate) ||
1263             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1264                     sizeof(vf_rss_query_en),
1265                     &vf_rss_query_en) ||
1266             nla_put(skb, IFLA_VF_TRUST,
1267                     sizeof(vf_trust), &vf_trust))
1268                 goto nla_put_vf_failure;
1269         vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST);
1270         if (!vfvlanlist)
1271                 goto nla_put_vf_failure;
1272         if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1273                     &vf_vlan_info)) {
1274                 nla_nest_cancel(skb, vfvlanlist);
1275                 goto nla_put_vf_failure;
1276         }
1277         nla_nest_end(skb, vfvlanlist);
1278         memset(&vf_stats, 0, sizeof(vf_stats));
1279         if (dev->netdev_ops->ndo_get_vf_stats)
1280                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1281                                                 &vf_stats);
1282         vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1283         if (!vfstats)
1284                 goto nla_put_vf_failure;
1285         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1286                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1287             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1288                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1289             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1290                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1291             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1292                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1293             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1294                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1295             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1296                               vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1297             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1298                               vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1299             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1300                               vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1301                 nla_nest_cancel(skb, vfstats);
1302                 goto nla_put_vf_failure;
1303         }
1304         nla_nest_end(skb, vfstats);
1305         nla_nest_end(skb, vf);
1306         return 0;
1307
1308 nla_put_vf_failure:
1309         nla_nest_cancel(skb, vf);
1310 nla_put_vfinfo_failure:
1311         nla_nest_cancel(skb, vfinfo);
1312         return -EMSGSIZE;
1313 }
1314
1315 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1316                                            struct net_device *dev,
1317                                            u32 ext_filter_mask)
1318 {
1319         struct nlattr *vfinfo;
1320         int i, num_vfs;
1321
1322         if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1323                 return 0;
1324
1325         num_vfs = dev_num_vf(dev->dev.parent);
1326         if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1327                 return -EMSGSIZE;
1328
1329         if (!dev->netdev_ops->ndo_get_vf_config)
1330                 return 0;
1331
1332         vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1333         if (!vfinfo)
1334                 return -EMSGSIZE;
1335
1336         for (i = 0; i < num_vfs; i++) {
1337                 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1338                         return -EMSGSIZE;
1339         }
1340
1341         nla_nest_end(skb, vfinfo);
1342         return 0;
1343 }
1344
1345 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1346 {
1347         struct rtnl_link_ifmap map;
1348
1349         memset(&map, 0, sizeof(map));
1350         map.mem_start   = dev->mem_start;
1351         map.mem_end     = dev->mem_end;
1352         map.base_addr   = dev->base_addr;
1353         map.irq         = dev->irq;
1354         map.dma         = dev->dma;
1355         map.port        = dev->if_port;
1356
1357         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1358                 return -EMSGSIZE;
1359
1360         return 0;
1361 }
1362
1363 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1364 {
1365         const struct bpf_prog *generic_xdp_prog;
1366
1367         ASSERT_RTNL();
1368
1369         generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1370         if (!generic_xdp_prog)
1371                 return 0;
1372         return generic_xdp_prog->aux->id;
1373 }
1374
1375 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1376 {
1377         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf, XDP_QUERY_PROG);
1378 }
1379
1380 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1381 {
1382         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf,
1383                                XDP_QUERY_PROG_HW);
1384 }
1385
1386 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1387                                u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1388                                u32 (*get_prog_id)(struct net_device *dev))
1389 {
1390         u32 curr_id;
1391         int err;
1392
1393         curr_id = get_prog_id(dev);
1394         if (!curr_id)
1395                 return 0;
1396
1397         *prog_id = curr_id;
1398         err = nla_put_u32(skb, attr, curr_id);
1399         if (err)
1400                 return err;
1401
1402         if (*mode != XDP_ATTACHED_NONE)
1403                 *mode = XDP_ATTACHED_MULTI;
1404         else
1405                 *mode = tgt_mode;
1406
1407         return 0;
1408 }
1409
1410 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1411 {
1412         struct nlattr *xdp;
1413         u32 prog_id;
1414         int err;
1415         u8 mode;
1416
1417         xdp = nla_nest_start(skb, IFLA_XDP);
1418         if (!xdp)
1419                 return -EMSGSIZE;
1420
1421         prog_id = 0;
1422         mode = XDP_ATTACHED_NONE;
1423         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1424                                   IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1425         if (err)
1426                 goto err_cancel;
1427         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1428                                   IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1429         if (err)
1430                 goto err_cancel;
1431         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1432                                   IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1433         if (err)
1434                 goto err_cancel;
1435
1436         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1437         if (err)
1438                 goto err_cancel;
1439
1440         if (prog_id && mode != XDP_ATTACHED_MULTI) {
1441                 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1442                 if (err)
1443                         goto err_cancel;
1444         }
1445
1446         nla_nest_end(skb, xdp);
1447         return 0;
1448
1449 err_cancel:
1450         nla_nest_cancel(skb, xdp);
1451         return err;
1452 }
1453
1454 static u32 rtnl_get_event(unsigned long event)
1455 {
1456         u32 rtnl_event_type = IFLA_EVENT_NONE;
1457
1458         switch (event) {
1459         case NETDEV_REBOOT:
1460                 rtnl_event_type = IFLA_EVENT_REBOOT;
1461                 break;
1462         case NETDEV_FEAT_CHANGE:
1463                 rtnl_event_type = IFLA_EVENT_FEATURES;
1464                 break;
1465         case NETDEV_BONDING_FAILOVER:
1466                 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1467                 break;
1468         case NETDEV_NOTIFY_PEERS:
1469                 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1470                 break;
1471         case NETDEV_RESEND_IGMP:
1472                 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1473                 break;
1474         case NETDEV_CHANGEINFODATA:
1475                 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1476                 break;
1477         default:
1478                 break;
1479         }
1480
1481         return rtnl_event_type;
1482 }
1483
1484 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1485 {
1486         const struct net_device *upper_dev;
1487         int ret = 0;
1488
1489         rcu_read_lock();
1490
1491         upper_dev = netdev_master_upper_dev_get_rcu(dev);
1492         if (upper_dev)
1493                 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1494
1495         rcu_read_unlock();
1496         return ret;
1497 }
1498
1499 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1500                           bool force)
1501 {
1502         int ifindex = dev_get_iflink(dev);
1503
1504         if (force || dev->ifindex != ifindex)
1505                 return nla_put_u32(skb, IFLA_LINK, ifindex);
1506
1507         return 0;
1508 }
1509
1510 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1511                                               struct net_device *dev)
1512 {
1513         char buf[IFALIASZ];
1514         int ret;
1515
1516         ret = dev_get_alias(dev, buf, sizeof(buf));
1517         return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1518 }
1519
1520 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1521                                   const struct net_device *dev,
1522                                   struct net *src_net, gfp_t gfp)
1523 {
1524         bool put_iflink = false;
1525
1526         if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1527                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1528
1529                 if (!net_eq(dev_net(dev), link_net)) {
1530                         int id = peernet2id_alloc(src_net, link_net, gfp);
1531
1532                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1533                                 return -EMSGSIZE;
1534
1535                         put_iflink = true;
1536                 }
1537         }
1538
1539         return nla_put_iflink(skb, dev, put_iflink);
1540 }
1541
1542 static int rtnl_fill_link_af(struct sk_buff *skb,
1543                              const struct net_device *dev,
1544                              u32 ext_filter_mask)
1545 {
1546         const struct rtnl_af_ops *af_ops;
1547         struct nlattr *af_spec;
1548
1549         af_spec = nla_nest_start(skb, IFLA_AF_SPEC);
1550         if (!af_spec)
1551                 return -EMSGSIZE;
1552
1553         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1554                 struct nlattr *af;
1555                 int err;
1556
1557                 if (!af_ops->fill_link_af)
1558                         continue;
1559
1560                 af = nla_nest_start(skb, af_ops->family);
1561                 if (!af)
1562                         return -EMSGSIZE;
1563
1564                 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1565                 /*
1566                  * Caller may return ENODATA to indicate that there
1567                  * was no data to be dumped. This is not an error, it
1568                  * means we should trim the attribute header and
1569                  * continue.
1570                  */
1571                 if (err == -ENODATA)
1572                         nla_nest_cancel(skb, af);
1573                 else if (err < 0)
1574                         return -EMSGSIZE;
1575
1576                 nla_nest_end(skb, af);
1577         }
1578
1579         nla_nest_end(skb, af_spec);
1580         return 0;
1581 }
1582
1583 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1584                             struct net_device *dev, struct net *src_net,
1585                             int type, u32 pid, u32 seq, u32 change,
1586                             unsigned int flags, u32 ext_filter_mask,
1587                             u32 event, int *new_nsid, int new_ifindex,
1588                             int tgt_netnsid, gfp_t gfp)
1589 {
1590         struct ifinfomsg *ifm;
1591         struct nlmsghdr *nlh;
1592
1593         ASSERT_RTNL();
1594         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1595         if (nlh == NULL)
1596                 return -EMSGSIZE;
1597
1598         ifm = nlmsg_data(nlh);
1599         ifm->ifi_family = AF_UNSPEC;
1600         ifm->__ifi_pad = 0;
1601         ifm->ifi_type = dev->type;
1602         ifm->ifi_index = dev->ifindex;
1603         ifm->ifi_flags = dev_get_flags(dev);
1604         ifm->ifi_change = change;
1605
1606         if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_IF_NETNSID, tgt_netnsid))
1607                 goto nla_put_failure;
1608
1609         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1610             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1611             nla_put_u8(skb, IFLA_OPERSTATE,
1612                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1613             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1614             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1615             nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1616             nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1617             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1618             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1619             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1620             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1621             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1622 #ifdef CONFIG_RPS
1623             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1624 #endif
1625             put_master_ifindex(skb, dev) ||
1626             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1627             (dev->qdisc &&
1628              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1629             nla_put_ifalias(skb, dev) ||
1630             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1631                         atomic_read(&dev->carrier_up_count) +
1632                         atomic_read(&dev->carrier_down_count)) ||
1633             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down) ||
1634             nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1635                         atomic_read(&dev->carrier_up_count)) ||
1636             nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1637                         atomic_read(&dev->carrier_down_count)))
1638                 goto nla_put_failure;
1639
1640         if (event != IFLA_EVENT_NONE) {
1641                 if (nla_put_u32(skb, IFLA_EVENT, event))
1642                         goto nla_put_failure;
1643         }
1644
1645         if (rtnl_fill_link_ifmap(skb, dev))
1646                 goto nla_put_failure;
1647
1648         if (dev->addr_len) {
1649                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1650                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1651                         goto nla_put_failure;
1652         }
1653
1654         if (rtnl_phys_port_id_fill(skb, dev))
1655                 goto nla_put_failure;
1656
1657         if (rtnl_phys_port_name_fill(skb, dev))
1658                 goto nla_put_failure;
1659
1660         if (rtnl_phys_switch_id_fill(skb, dev))
1661                 goto nla_put_failure;
1662
1663         if (rtnl_fill_stats(skb, dev))
1664                 goto nla_put_failure;
1665
1666         if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1667                 goto nla_put_failure;
1668
1669         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1670                 goto nla_put_failure;
1671
1672         if (rtnl_xdp_fill(skb, dev))
1673                 goto nla_put_failure;
1674
1675         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1676                 if (rtnl_link_fill(skb, dev) < 0)
1677                         goto nla_put_failure;
1678         }
1679
1680         if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1681                 goto nla_put_failure;
1682
1683         if (new_nsid &&
1684             nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1685                 goto nla_put_failure;
1686         if (new_ifindex &&
1687             nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1688                 goto nla_put_failure;
1689
1690
1691         rcu_read_lock();
1692         if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1693                 goto nla_put_failure_rcu;
1694         rcu_read_unlock();
1695
1696         nlmsg_end(skb, nlh);
1697         return 0;
1698
1699 nla_put_failure_rcu:
1700         rcu_read_unlock();
1701 nla_put_failure:
1702         nlmsg_cancel(skb, nlh);
1703         return -EMSGSIZE;
1704 }
1705
1706 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1707         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1708         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1709         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1710         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1711         [IFLA_MTU]              = { .type = NLA_U32 },
1712         [IFLA_LINK]             = { .type = NLA_U32 },
1713         [IFLA_MASTER]           = { .type = NLA_U32 },
1714         [IFLA_CARRIER]          = { .type = NLA_U8 },
1715         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1716         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1717         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1718         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1719         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1720         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1721         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1722         /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1723          * allow 0-length string (needed to remove an alias).
1724          */
1725         [IFLA_IFALIAS]          = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1726         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1727         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1728         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1729         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1730         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1731         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1732         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1733         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1734         [IFLA_GSO_MAX_SEGS]     = { .type = NLA_U32 },
1735         [IFLA_GSO_MAX_SIZE]     = { .type = NLA_U32 },
1736         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1737         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1738         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1739         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1740         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1741         [IFLA_XDP]              = { .type = NLA_NESTED },
1742         [IFLA_EVENT]            = { .type = NLA_U32 },
1743         [IFLA_GROUP]            = { .type = NLA_U32 },
1744         [IFLA_IF_NETNSID]       = { .type = NLA_S32 },
1745         [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1746         [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1747         [IFLA_MIN_MTU]          = { .type = NLA_U32 },
1748         [IFLA_MAX_MTU]          = { .type = NLA_U32 },
1749 };
1750
1751 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1752         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1753         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1754         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1755         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1756 };
1757
1758 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1759         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1760         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1761         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1762         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1763         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1764         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1765         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1766         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1767         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1768         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1769         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1770         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1771 };
1772
1773 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1774         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1775         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1776                                     .len = PORT_PROFILE_MAX },
1777         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1778                                       .len = PORT_UUID_MAX },
1779         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1780                                     .len = PORT_UUID_MAX },
1781         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1782         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1783
1784         /* Unused, but we need to keep it here since user space could
1785          * fill it. It's also broken with regard to NLA_BINARY use in
1786          * combination with structs.
1787          */
1788         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1789                                     .len = sizeof(struct ifla_port_vsi) },
1790 };
1791
1792 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1793         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1794         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1795         [IFLA_XDP_FLAGS]        = { .type = NLA_U32 },
1796         [IFLA_XDP_PROG_ID]      = { .type = NLA_U32 },
1797 };
1798
1799 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1800 {
1801         const struct rtnl_link_ops *ops = NULL;
1802         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1803
1804         if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla,
1805                              ifla_info_policy, NULL) < 0)
1806                 return NULL;
1807
1808         if (linfo[IFLA_INFO_KIND]) {
1809                 char kind[MODULE_NAME_LEN];
1810
1811                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1812                 ops = rtnl_link_ops_get(kind);
1813         }
1814
1815         return ops;
1816 }
1817
1818 static bool link_master_filtered(struct net_device *dev, int master_idx)
1819 {
1820         struct net_device *master;
1821
1822         if (!master_idx)
1823                 return false;
1824
1825         master = netdev_master_upper_dev_get(dev);
1826         if (!master || master->ifindex != master_idx)
1827                 return true;
1828
1829         return false;
1830 }
1831
1832 static bool link_kind_filtered(const struct net_device *dev,
1833                                const struct rtnl_link_ops *kind_ops)
1834 {
1835         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1836                 return true;
1837
1838         return false;
1839 }
1840
1841 static bool link_dump_filtered(struct net_device *dev,
1842                                int master_idx,
1843                                const struct rtnl_link_ops *kind_ops)
1844 {
1845         if (link_master_filtered(dev, master_idx) ||
1846             link_kind_filtered(dev, kind_ops))
1847                 return true;
1848
1849         return false;
1850 }
1851
1852 static struct net *get_target_net(struct sock *sk, int netnsid)
1853 {
1854         struct net *net;
1855
1856         net = get_net_ns_by_id(sock_net(sk), netnsid);
1857         if (!net)
1858                 return ERR_PTR(-EINVAL);
1859
1860         /* For now, the caller is required to have CAP_NET_ADMIN in
1861          * the user namespace owning the target net ns.
1862          */
1863         if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
1864                 put_net(net);
1865                 return ERR_PTR(-EACCES);
1866         }
1867         return net;
1868 }
1869
1870 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1871 {
1872         struct net *net = sock_net(skb->sk);
1873         struct net *tgt_net = net;
1874         int h, s_h;
1875         int idx = 0, s_idx;
1876         struct net_device *dev;
1877         struct hlist_head *head;
1878         struct nlattr *tb[IFLA_MAX+1];
1879         u32 ext_filter_mask = 0;
1880         const struct rtnl_link_ops *kind_ops = NULL;
1881         unsigned int flags = NLM_F_MULTI;
1882         int master_idx = 0;
1883         int netnsid = -1;
1884         int err;
1885         int hdrlen;
1886
1887         s_h = cb->args[0];
1888         s_idx = cb->args[1];
1889
1890         /* A hack to preserve kernel<->userspace interface.
1891          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1892          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1893          * what iproute2 < v3.9.0 used.
1894          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1895          * attribute, its netlink message is shorter than struct ifinfomsg.
1896          */
1897         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1898                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1899
1900         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX,
1901                         ifla_policy, NULL) >= 0) {
1902                 if (tb[IFLA_IF_NETNSID]) {
1903                         netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
1904                         tgt_net = get_target_net(skb->sk, netnsid);
1905                         if (IS_ERR(tgt_net))
1906                                 return PTR_ERR(tgt_net);
1907                 }
1908
1909                 if (tb[IFLA_EXT_MASK])
1910                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1911
1912                 if (tb[IFLA_MASTER])
1913                         master_idx = nla_get_u32(tb[IFLA_MASTER]);
1914
1915                 if (tb[IFLA_LINKINFO])
1916                         kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1917
1918                 if (master_idx || kind_ops)
1919                         flags |= NLM_F_DUMP_FILTERED;
1920         }
1921
1922         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1923                 idx = 0;
1924                 head = &tgt_net->dev_index_head[h];
1925                 hlist_for_each_entry(dev, head, index_hlist) {
1926                         if (link_dump_filtered(dev, master_idx, kind_ops))
1927                                 goto cont;
1928                         if (idx < s_idx)
1929                                 goto cont;
1930                         err = rtnl_fill_ifinfo(skb, dev, net,
1931                                                RTM_NEWLINK,
1932                                                NETLINK_CB(cb->skb).portid,
1933                                                cb->nlh->nlmsg_seq, 0,
1934                                                flags,
1935                                                ext_filter_mask, 0, NULL, 0,
1936                                                netnsid, GFP_KERNEL);
1937
1938                         if (err < 0) {
1939                                 if (likely(skb->len))
1940                                         goto out;
1941
1942                                 goto out_err;
1943                         }
1944 cont:
1945                         idx++;
1946                 }
1947         }
1948 out:
1949         err = skb->len;
1950 out_err:
1951         cb->args[1] = idx;
1952         cb->args[0] = h;
1953         cb->seq = net->dev_base_seq;
1954         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1955         if (netnsid >= 0)
1956                 put_net(tgt_net);
1957
1958         return err;
1959 }
1960
1961 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
1962                         struct netlink_ext_ack *exterr)
1963 {
1964         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy, exterr);
1965 }
1966 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1967
1968 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1969 {
1970         struct net *net;
1971         /* Examine the link attributes and figure out which
1972          * network namespace we are talking about.
1973          */
1974         if (tb[IFLA_NET_NS_PID])
1975                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1976         else if (tb[IFLA_NET_NS_FD])
1977                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1978         else
1979                 net = get_net(src_net);
1980         return net;
1981 }
1982 EXPORT_SYMBOL(rtnl_link_get_net);
1983
1984 /* Figure out which network namespace we are talking about by
1985  * examining the link attributes in the following order:
1986  *
1987  * 1. IFLA_NET_NS_PID
1988  * 2. IFLA_NET_NS_FD
1989  * 3. IFLA_IF_NETNSID
1990  */
1991 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
1992                                                struct nlattr *tb[])
1993 {
1994         struct net *net;
1995
1996         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
1997                 return rtnl_link_get_net(src_net, tb);
1998
1999         if (!tb[IFLA_IF_NETNSID])
2000                 return get_net(src_net);
2001
2002         net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_IF_NETNSID]));
2003         if (!net)
2004                 return ERR_PTR(-EINVAL);
2005
2006         return net;
2007 }
2008
2009 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2010                                              struct net *src_net,
2011                                              struct nlattr *tb[], int cap)
2012 {
2013         struct net *net;
2014
2015         net = rtnl_link_get_net_by_nlattr(src_net, tb);
2016         if (IS_ERR(net))
2017                 return net;
2018
2019         if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2020                 put_net(net);
2021                 return ERR_PTR(-EPERM);
2022         }
2023
2024         return net;
2025 }
2026
2027 /* Verify that rtnetlink requests do not pass additional properties
2028  * potentially referring to different network namespaces.
2029  */
2030 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2031                                     struct netlink_ext_ack *extack,
2032                                     bool netns_id_only)
2033 {
2034
2035         if (netns_id_only) {
2036                 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2037                         return 0;
2038
2039                 NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2040                 return -EOPNOTSUPP;
2041         }
2042
2043         if (tb[IFLA_IF_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2044                 goto invalid_attr;
2045
2046         if (tb[IFLA_NET_NS_PID] && (tb[IFLA_IF_NETNSID] || tb[IFLA_NET_NS_FD]))
2047                 goto invalid_attr;
2048
2049         if (tb[IFLA_NET_NS_FD] && (tb[IFLA_IF_NETNSID] || tb[IFLA_NET_NS_PID]))
2050                 goto invalid_attr;
2051
2052         return 0;
2053
2054 invalid_attr:
2055         NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2056         return -EINVAL;
2057 }
2058
2059 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
2060 {
2061         if (dev) {
2062                 if (tb[IFLA_ADDRESS] &&
2063                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2064                         return -EINVAL;
2065
2066                 if (tb[IFLA_BROADCAST] &&
2067                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2068                         return -EINVAL;
2069         }
2070
2071         if (tb[IFLA_AF_SPEC]) {
2072                 struct nlattr *af;
2073                 int rem, err;
2074
2075                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2076                         const struct rtnl_af_ops *af_ops;
2077
2078                         rcu_read_lock();
2079                         af_ops = rtnl_af_lookup(nla_type(af));
2080                         if (!af_ops) {
2081                                 rcu_read_unlock();
2082                                 return -EAFNOSUPPORT;
2083                         }
2084
2085                         if (!af_ops->set_link_af) {
2086                                 rcu_read_unlock();
2087                                 return -EOPNOTSUPP;
2088                         }
2089
2090                         if (af_ops->validate_link_af) {
2091                                 err = af_ops->validate_link_af(dev, af);
2092                                 if (err < 0) {
2093                                         rcu_read_unlock();
2094                                         return err;
2095                                 }
2096                         }
2097
2098                         rcu_read_unlock();
2099                 }
2100         }
2101
2102         return 0;
2103 }
2104
2105 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2106                                   int guid_type)
2107 {
2108         const struct net_device_ops *ops = dev->netdev_ops;
2109
2110         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2111 }
2112
2113 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2114 {
2115         if (dev->type != ARPHRD_INFINIBAND)
2116                 return -EOPNOTSUPP;
2117
2118         return handle_infiniband_guid(dev, ivt, guid_type);
2119 }
2120
2121 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2122 {
2123         const struct net_device_ops *ops = dev->netdev_ops;
2124         int err = -EINVAL;
2125
2126         if (tb[IFLA_VF_MAC]) {
2127                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2128
2129                 if (ivm->vf >= INT_MAX)
2130                         return -EINVAL;
2131                 err = -EOPNOTSUPP;
2132                 if (ops->ndo_set_vf_mac)
2133                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
2134                                                   ivm->mac);
2135                 if (err < 0)
2136                         return err;
2137         }
2138
2139         if (tb[IFLA_VF_VLAN]) {
2140                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2141
2142                 if (ivv->vf >= INT_MAX)
2143                         return -EINVAL;
2144                 err = -EOPNOTSUPP;
2145                 if (ops->ndo_set_vf_vlan)
2146                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2147                                                    ivv->qos,
2148                                                    htons(ETH_P_8021Q));
2149                 if (err < 0)
2150                         return err;
2151         }
2152
2153         if (tb[IFLA_VF_VLAN_LIST]) {
2154                 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2155                 struct nlattr *attr;
2156                 int rem, len = 0;
2157
2158                 err = -EOPNOTSUPP;
2159                 if (!ops->ndo_set_vf_vlan)
2160                         return err;
2161
2162                 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2163                         if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2164                             nla_len(attr) < NLA_HDRLEN) {
2165                                 return -EINVAL;
2166                         }
2167                         if (len >= MAX_VLAN_LIST_LEN)
2168                                 return -EOPNOTSUPP;
2169                         ivvl[len] = nla_data(attr);
2170
2171                         len++;
2172                 }
2173                 if (len == 0)
2174                         return -EINVAL;
2175
2176                 if (ivvl[0]->vf >= INT_MAX)
2177                         return -EINVAL;
2178                 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2179                                            ivvl[0]->qos, ivvl[0]->vlan_proto);
2180                 if (err < 0)
2181                         return err;
2182         }
2183
2184         if (tb[IFLA_VF_TX_RATE]) {
2185                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2186                 struct ifla_vf_info ivf;
2187
2188                 if (ivt->vf >= INT_MAX)
2189                         return -EINVAL;
2190                 err = -EOPNOTSUPP;
2191                 if (ops->ndo_get_vf_config)
2192                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2193                 if (err < 0)
2194                         return err;
2195
2196                 err = -EOPNOTSUPP;
2197                 if (ops->ndo_set_vf_rate)
2198                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2199                                                    ivf.min_tx_rate,
2200                                                    ivt->rate);
2201                 if (err < 0)
2202                         return err;
2203         }
2204
2205         if (tb[IFLA_VF_RATE]) {
2206                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2207
2208                 if (ivt->vf >= INT_MAX)
2209                         return -EINVAL;
2210                 err = -EOPNOTSUPP;
2211                 if (ops->ndo_set_vf_rate)
2212                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2213                                                    ivt->min_tx_rate,
2214                                                    ivt->max_tx_rate);
2215                 if (err < 0)
2216                         return err;
2217         }
2218
2219         if (tb[IFLA_VF_SPOOFCHK]) {
2220                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2221
2222                 if (ivs->vf >= INT_MAX)
2223                         return -EINVAL;
2224                 err = -EOPNOTSUPP;
2225                 if (ops->ndo_set_vf_spoofchk)
2226                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2227                                                        ivs->setting);
2228                 if (err < 0)
2229                         return err;
2230         }
2231
2232         if (tb[IFLA_VF_LINK_STATE]) {
2233                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2234
2235                 if (ivl->vf >= INT_MAX)
2236                         return -EINVAL;
2237                 err = -EOPNOTSUPP;
2238                 if (ops->ndo_set_vf_link_state)
2239                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2240                                                          ivl->link_state);
2241                 if (err < 0)
2242                         return err;
2243         }
2244
2245         if (tb[IFLA_VF_RSS_QUERY_EN]) {
2246                 struct ifla_vf_rss_query_en *ivrssq_en;
2247
2248                 err = -EOPNOTSUPP;
2249                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2250                 if (ivrssq_en->vf >= INT_MAX)
2251                         return -EINVAL;
2252                 if (ops->ndo_set_vf_rss_query_en)
2253                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2254                                                            ivrssq_en->setting);
2255                 if (err < 0)
2256                         return err;
2257         }
2258
2259         if (tb[IFLA_VF_TRUST]) {
2260                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2261
2262                 if (ivt->vf >= INT_MAX)
2263                         return -EINVAL;
2264                 err = -EOPNOTSUPP;
2265                 if (ops->ndo_set_vf_trust)
2266                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2267                 if (err < 0)
2268                         return err;
2269         }
2270
2271         if (tb[IFLA_VF_IB_NODE_GUID]) {
2272                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2273
2274                 if (ivt->vf >= INT_MAX)
2275                         return -EINVAL;
2276                 if (!ops->ndo_set_vf_guid)
2277                         return -EOPNOTSUPP;
2278                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2279         }
2280
2281         if (tb[IFLA_VF_IB_PORT_GUID]) {
2282                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2283
2284                 if (ivt->vf >= INT_MAX)
2285                         return -EINVAL;
2286                 if (!ops->ndo_set_vf_guid)
2287                         return -EOPNOTSUPP;
2288
2289                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2290         }
2291
2292         return err;
2293 }
2294
2295 static int do_set_master(struct net_device *dev, int ifindex,
2296                          struct netlink_ext_ack *extack)
2297 {
2298         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2299         const struct net_device_ops *ops;
2300         int err;
2301
2302         if (upper_dev) {
2303                 if (upper_dev->ifindex == ifindex)
2304                         return 0;
2305                 ops = upper_dev->netdev_ops;
2306                 if (ops->ndo_del_slave) {
2307                         err = ops->ndo_del_slave(upper_dev, dev);
2308                         if (err)
2309                                 return err;
2310                 } else {
2311                         return -EOPNOTSUPP;
2312                 }
2313         }
2314
2315         if (ifindex) {
2316                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2317                 if (!upper_dev)
2318                         return -EINVAL;
2319                 ops = upper_dev->netdev_ops;
2320                 if (ops->ndo_add_slave) {
2321                         err = ops->ndo_add_slave(upper_dev, dev, extack);
2322                         if (err)
2323                                 return err;
2324                 } else {
2325                         return -EOPNOTSUPP;
2326                 }
2327         }
2328         return 0;
2329 }
2330
2331 #define DO_SETLINK_MODIFIED     0x01
2332 /* notify flag means notify + modified. */
2333 #define DO_SETLINK_NOTIFY       0x03
2334 static int do_setlink(const struct sk_buff *skb,
2335                       struct net_device *dev, struct ifinfomsg *ifm,
2336                       struct netlink_ext_ack *extack,
2337                       struct nlattr **tb, char *ifname, int status)
2338 {
2339         const struct net_device_ops *ops = dev->netdev_ops;
2340         int err;
2341
2342         err = validate_linkmsg(dev, tb);
2343         if (err < 0)
2344                 return err;
2345
2346         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_IF_NETNSID]) {
2347                 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev),
2348                                                             tb, CAP_NET_ADMIN);
2349                 if (IS_ERR(net)) {
2350                         err = PTR_ERR(net);
2351                         goto errout;
2352                 }
2353
2354                 err = dev_change_net_namespace(dev, net, ifname);
2355                 put_net(net);
2356                 if (err)
2357                         goto errout;
2358                 status |= DO_SETLINK_MODIFIED;
2359         }
2360
2361         if (tb[IFLA_MAP]) {
2362                 struct rtnl_link_ifmap *u_map;
2363                 struct ifmap k_map;
2364
2365                 if (!ops->ndo_set_config) {
2366                         err = -EOPNOTSUPP;
2367                         goto errout;
2368                 }
2369
2370                 if (!netif_device_present(dev)) {
2371                         err = -ENODEV;
2372                         goto errout;
2373                 }
2374
2375                 u_map = nla_data(tb[IFLA_MAP]);
2376                 k_map.mem_start = (unsigned long) u_map->mem_start;
2377                 k_map.mem_end = (unsigned long) u_map->mem_end;
2378                 k_map.base_addr = (unsigned short) u_map->base_addr;
2379                 k_map.irq = (unsigned char) u_map->irq;
2380                 k_map.dma = (unsigned char) u_map->dma;
2381                 k_map.port = (unsigned char) u_map->port;
2382
2383                 err = ops->ndo_set_config(dev, &k_map);
2384                 if (err < 0)
2385                         goto errout;
2386
2387                 status |= DO_SETLINK_NOTIFY;
2388         }
2389
2390         if (tb[IFLA_ADDRESS]) {
2391                 struct sockaddr *sa;
2392                 int len;
2393
2394                 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2395                                                   sizeof(*sa));
2396                 sa = kmalloc(len, GFP_KERNEL);
2397                 if (!sa) {
2398                         err = -ENOMEM;
2399                         goto errout;
2400                 }
2401                 sa->sa_family = dev->type;
2402                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2403                        dev->addr_len);
2404                 err = dev_set_mac_address(dev, sa);
2405                 kfree(sa);
2406                 if (err)
2407                         goto errout;
2408                 status |= DO_SETLINK_MODIFIED;
2409         }
2410
2411         if (tb[IFLA_MTU]) {
2412                 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2413                 if (err < 0)
2414                         goto errout;
2415                 status |= DO_SETLINK_MODIFIED;
2416         }
2417
2418         if (tb[IFLA_GROUP]) {
2419                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2420                 status |= DO_SETLINK_NOTIFY;
2421         }
2422
2423         /*
2424          * Interface selected by interface index but interface
2425          * name provided implies that a name change has been
2426          * requested.
2427          */
2428         if (ifm->ifi_index > 0 && ifname[0]) {
2429                 err = dev_change_name(dev, ifname);
2430                 if (err < 0)
2431                         goto errout;
2432                 status |= DO_SETLINK_MODIFIED;
2433         }
2434
2435         if (tb[IFLA_IFALIAS]) {
2436                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2437                                     nla_len(tb[IFLA_IFALIAS]));
2438                 if (err < 0)
2439                         goto errout;
2440                 status |= DO_SETLINK_NOTIFY;
2441         }
2442
2443         if (tb[IFLA_BROADCAST]) {
2444                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2445                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2446         }
2447
2448         if (ifm->ifi_flags || ifm->ifi_change) {
2449                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2450                 if (err < 0)
2451                         goto errout;
2452         }
2453
2454         if (tb[IFLA_MASTER]) {
2455                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2456                 if (err)
2457                         goto errout;
2458                 status |= DO_SETLINK_MODIFIED;
2459         }
2460
2461         if (tb[IFLA_CARRIER]) {
2462                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2463                 if (err)
2464                         goto errout;
2465                 status |= DO_SETLINK_MODIFIED;
2466         }
2467
2468         if (tb[IFLA_TXQLEN]) {
2469                 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2470
2471                 err = dev_change_tx_queue_len(dev, value);
2472                 if (err)
2473                         goto errout;
2474                 status |= DO_SETLINK_MODIFIED;
2475         }
2476
2477         if (tb[IFLA_GSO_MAX_SIZE]) {
2478                 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2479
2480                 if (max_size > GSO_MAX_SIZE) {
2481                         err = -EINVAL;
2482                         goto errout;
2483                 }
2484
2485                 if (dev->gso_max_size ^ max_size) {
2486                         netif_set_gso_max_size(dev, max_size);
2487                         status |= DO_SETLINK_MODIFIED;
2488                 }
2489         }
2490
2491         if (tb[IFLA_GSO_MAX_SEGS]) {
2492                 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2493
2494                 if (max_segs > GSO_MAX_SEGS) {
2495                         err = -EINVAL;
2496                         goto errout;
2497                 }
2498
2499                 if (dev->gso_max_segs ^ max_segs) {
2500                         dev->gso_max_segs = max_segs;
2501                         status |= DO_SETLINK_MODIFIED;
2502                 }
2503         }
2504
2505         if (tb[IFLA_OPERSTATE])
2506                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2507
2508         if (tb[IFLA_LINKMODE]) {
2509                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2510
2511                 write_lock_bh(&dev_base_lock);
2512                 if (dev->link_mode ^ value)
2513                         status |= DO_SETLINK_NOTIFY;
2514                 dev->link_mode = value;
2515                 write_unlock_bh(&dev_base_lock);
2516         }
2517
2518         if (tb[IFLA_VFINFO_LIST]) {
2519                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2520                 struct nlattr *attr;
2521                 int rem;
2522
2523                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2524                         if (nla_type(attr) != IFLA_VF_INFO ||
2525                             nla_len(attr) < NLA_HDRLEN) {
2526                                 err = -EINVAL;
2527                                 goto errout;
2528                         }
2529                         err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2530                                                ifla_vf_policy, NULL);
2531                         if (err < 0)
2532                                 goto errout;
2533                         err = do_setvfinfo(dev, vfinfo);
2534                         if (err < 0)
2535                                 goto errout;
2536                         status |= DO_SETLINK_NOTIFY;
2537                 }
2538         }
2539         err = 0;
2540
2541         if (tb[IFLA_VF_PORTS]) {
2542                 struct nlattr *port[IFLA_PORT_MAX+1];
2543                 struct nlattr *attr;
2544                 int vf;
2545                 int rem;
2546
2547                 err = -EOPNOTSUPP;
2548                 if (!ops->ndo_set_vf_port)
2549                         goto errout;
2550
2551                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2552                         if (nla_type(attr) != IFLA_VF_PORT ||
2553                             nla_len(attr) < NLA_HDRLEN) {
2554                                 err = -EINVAL;
2555                                 goto errout;
2556                         }
2557                         err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2558                                                ifla_port_policy, NULL);
2559                         if (err < 0)
2560                                 goto errout;
2561                         if (!port[IFLA_PORT_VF]) {
2562                                 err = -EOPNOTSUPP;
2563                                 goto errout;
2564                         }
2565                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2566                         err = ops->ndo_set_vf_port(dev, vf, port);
2567                         if (err < 0)
2568                                 goto errout;
2569                         status |= DO_SETLINK_NOTIFY;
2570                 }
2571         }
2572         err = 0;
2573
2574         if (tb[IFLA_PORT_SELF]) {
2575                 struct nlattr *port[IFLA_PORT_MAX+1];
2576
2577                 err = nla_parse_nested(port, IFLA_PORT_MAX,
2578                                        tb[IFLA_PORT_SELF], ifla_port_policy,
2579                                        NULL);
2580                 if (err < 0)
2581                         goto errout;
2582
2583                 err = -EOPNOTSUPP;
2584                 if (ops->ndo_set_vf_port)
2585                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2586                 if (err < 0)
2587                         goto errout;
2588                 status |= DO_SETLINK_NOTIFY;
2589         }
2590
2591         if (tb[IFLA_AF_SPEC]) {
2592                 struct nlattr *af;
2593                 int rem;
2594
2595                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2596                         const struct rtnl_af_ops *af_ops;
2597
2598                         rcu_read_lock();
2599
2600                         BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2601
2602                         err = af_ops->set_link_af(dev, af);
2603                         if (err < 0) {
2604                                 rcu_read_unlock();
2605                                 goto errout;
2606                         }
2607
2608                         rcu_read_unlock();
2609                         status |= DO_SETLINK_NOTIFY;
2610                 }
2611         }
2612         err = 0;
2613
2614         if (tb[IFLA_PROTO_DOWN]) {
2615                 err = dev_change_proto_down(dev,
2616                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2617                 if (err)
2618                         goto errout;
2619                 status |= DO_SETLINK_NOTIFY;
2620         }
2621
2622         if (tb[IFLA_XDP]) {
2623                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2624                 u32 xdp_flags = 0;
2625
2626                 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2627                                        ifla_xdp_policy, NULL);
2628                 if (err < 0)
2629                         goto errout;
2630
2631                 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2632                         err = -EINVAL;
2633                         goto errout;
2634                 }
2635
2636                 if (xdp[IFLA_XDP_FLAGS]) {
2637                         xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2638                         if (xdp_flags & ~XDP_FLAGS_MASK) {
2639                                 err = -EINVAL;
2640                                 goto errout;
2641                         }
2642                         if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2643                                 err = -EINVAL;
2644                                 goto errout;
2645                         }
2646                 }
2647
2648                 if (xdp[IFLA_XDP_FD]) {
2649                         err = dev_change_xdp_fd(dev, extack,
2650                                                 nla_get_s32(xdp[IFLA_XDP_FD]),
2651                                                 xdp_flags);
2652                         if (err)
2653                                 goto errout;
2654                         status |= DO_SETLINK_NOTIFY;
2655                 }
2656         }
2657
2658 errout:
2659         if (status & DO_SETLINK_MODIFIED) {
2660                 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2661                         netdev_state_change(dev);
2662
2663                 if (err < 0)
2664                         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",
2665                                              dev->name);
2666         }
2667
2668         return err;
2669 }
2670
2671 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2672                         struct netlink_ext_ack *extack)
2673 {
2674         struct net *net = sock_net(skb->sk);
2675         struct ifinfomsg *ifm;
2676         struct net_device *dev;
2677         int err;
2678         struct nlattr *tb[IFLA_MAX+1];
2679         char ifname[IFNAMSIZ];
2680
2681         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy,
2682                           extack);
2683         if (err < 0)
2684                 goto errout;
2685
2686         err = rtnl_ensure_unique_netns(tb, extack, false);
2687         if (err < 0)
2688                 goto errout;
2689
2690         if (tb[IFLA_IFNAME])
2691                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2692         else
2693                 ifname[0] = '\0';
2694
2695         err = -EINVAL;
2696         ifm = nlmsg_data(nlh);
2697         if (ifm->ifi_index > 0)
2698                 dev = __dev_get_by_index(net, ifm->ifi_index);
2699         else if (tb[IFLA_IFNAME])
2700                 dev = __dev_get_by_name(net, ifname);
2701         else
2702                 goto errout;
2703
2704         if (dev == NULL) {
2705                 err = -ENODEV;
2706                 goto errout;
2707         }
2708
2709         err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2710 errout:
2711         return err;
2712 }
2713
2714 static int rtnl_group_dellink(const struct net *net, int group)
2715 {
2716         struct net_device *dev, *aux;
2717         LIST_HEAD(list_kill);
2718         bool found = false;
2719
2720         if (!group)
2721                 return -EPERM;
2722
2723         for_each_netdev(net, dev) {
2724                 if (dev->group == group) {
2725                         const struct rtnl_link_ops *ops;
2726
2727                         found = true;
2728                         ops = dev->rtnl_link_ops;
2729                         if (!ops || !ops->dellink)
2730                                 return -EOPNOTSUPP;
2731                 }
2732         }
2733
2734         if (!found)
2735                 return -ENODEV;
2736
2737         for_each_netdev_safe(net, dev, aux) {
2738                 if (dev->group == group) {
2739                         const struct rtnl_link_ops *ops;
2740
2741                         ops = dev->rtnl_link_ops;
2742                         ops->dellink(dev, &list_kill);
2743                 }
2744         }
2745         unregister_netdevice_many(&list_kill);
2746
2747         return 0;
2748 }
2749
2750 int rtnl_delete_link(struct net_device *dev)
2751 {
2752         const struct rtnl_link_ops *ops;
2753         LIST_HEAD(list_kill);
2754
2755         ops = dev->rtnl_link_ops;
2756         if (!ops || !ops->dellink)
2757                 return -EOPNOTSUPP;
2758
2759         ops->dellink(dev, &list_kill);
2760         unregister_netdevice_many(&list_kill);
2761
2762         return 0;
2763 }
2764 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2765
2766 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2767                         struct netlink_ext_ack *extack)
2768 {
2769         struct net *net = sock_net(skb->sk);
2770         struct net *tgt_net = net;
2771         struct net_device *dev = NULL;
2772         struct ifinfomsg *ifm;
2773         char ifname[IFNAMSIZ];
2774         struct nlattr *tb[IFLA_MAX+1];
2775         int err;
2776         int netnsid = -1;
2777
2778         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2779         if (err < 0)
2780                 return err;
2781
2782         err = rtnl_ensure_unique_netns(tb, extack, true);
2783         if (err < 0)
2784                 return err;
2785
2786         if (tb[IFLA_IFNAME])
2787                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2788
2789         if (tb[IFLA_IF_NETNSID]) {
2790                 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
2791                 tgt_net = get_target_net(NETLINK_CB(skb).sk, netnsid);
2792                 if (IS_ERR(tgt_net))
2793                         return PTR_ERR(tgt_net);
2794         }
2795
2796         err = -EINVAL;
2797         ifm = nlmsg_data(nlh);
2798         if (ifm->ifi_index > 0)
2799                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
2800         else if (tb[IFLA_IFNAME])
2801                 dev = __dev_get_by_name(tgt_net, ifname);
2802         else if (tb[IFLA_GROUP])
2803                 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
2804         else
2805                 goto out;
2806
2807         if (!dev) {
2808                 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
2809                         err = -ENODEV;
2810
2811                 goto out;
2812         }
2813
2814         err = rtnl_delete_link(dev);
2815
2816 out:
2817         if (netnsid >= 0)
2818                 put_net(tgt_net);
2819
2820         return err;
2821 }
2822
2823 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2824 {
2825         unsigned int old_flags;
2826         int err;
2827
2828         old_flags = dev->flags;
2829         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2830                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2831                 if (err < 0)
2832                         return err;
2833         }
2834
2835         if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
2836                 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
2837         } else {
2838                 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2839                 __dev_notify_flags(dev, old_flags, ~0U);
2840         }
2841         return 0;
2842 }
2843 EXPORT_SYMBOL(rtnl_configure_link);
2844
2845 struct net_device *rtnl_create_link(struct net *net,
2846         const char *ifname, unsigned char name_assign_type,
2847         const struct rtnl_link_ops *ops, struct nlattr *tb[])
2848 {
2849         struct net_device *dev;
2850         unsigned int num_tx_queues = 1;
2851         unsigned int num_rx_queues = 1;
2852
2853         if (tb[IFLA_NUM_TX_QUEUES])
2854                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2855         else if (ops->get_num_tx_queues)
2856                 num_tx_queues = ops->get_num_tx_queues();
2857
2858         if (tb[IFLA_NUM_RX_QUEUES])
2859                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2860         else if (ops->get_num_rx_queues)
2861                 num_rx_queues = ops->get_num_rx_queues();
2862
2863         if (num_tx_queues < 1 || num_tx_queues > 4096)
2864                 return ERR_PTR(-EINVAL);
2865
2866         if (num_rx_queues < 1 || num_rx_queues > 4096)
2867                 return ERR_PTR(-EINVAL);
2868
2869         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2870                                ops->setup, num_tx_queues, num_rx_queues);
2871         if (!dev)
2872                 return ERR_PTR(-ENOMEM);
2873
2874         dev_net_set(dev, net);
2875         dev->rtnl_link_ops = ops;
2876         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2877
2878         if (tb[IFLA_MTU]) {
2879                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2880                 int err;
2881
2882                 err = dev_validate_mtu(dev, mtu, NULL);
2883                 if (err) {
2884                         free_netdev(dev);
2885                         return ERR_PTR(err);
2886                 }
2887                 dev->mtu = mtu;
2888         }
2889         if (tb[IFLA_ADDRESS]) {
2890                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2891                                 nla_len(tb[IFLA_ADDRESS]));
2892                 dev->addr_assign_type = NET_ADDR_SET;
2893         }
2894         if (tb[IFLA_BROADCAST])
2895                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2896                                 nla_len(tb[IFLA_BROADCAST]));
2897         if (tb[IFLA_TXQLEN])
2898                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2899         if (tb[IFLA_OPERSTATE])
2900                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2901         if (tb[IFLA_LINKMODE])
2902                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2903         if (tb[IFLA_GROUP])
2904                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2905         if (tb[IFLA_GSO_MAX_SIZE])
2906                 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
2907         if (tb[IFLA_GSO_MAX_SEGS])
2908                 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2909
2910         return dev;
2911 }
2912 EXPORT_SYMBOL(rtnl_create_link);
2913
2914 static int rtnl_group_changelink(const struct sk_buff *skb,
2915                 struct net *net, int group,
2916                 struct ifinfomsg *ifm,
2917                 struct netlink_ext_ack *extack,
2918                 struct nlattr **tb)
2919 {
2920         struct net_device *dev, *aux;
2921         int err;
2922
2923         for_each_netdev_safe(net, dev, aux) {
2924                 if (dev->group == group) {
2925                         err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
2926                         if (err < 0)
2927                                 return err;
2928                 }
2929         }
2930
2931         return 0;
2932 }
2933
2934 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2935                         struct netlink_ext_ack *extack)
2936 {
2937         struct net *net = sock_net(skb->sk);
2938         const struct rtnl_link_ops *ops;
2939         const struct rtnl_link_ops *m_ops = NULL;
2940         struct net_device *dev;
2941         struct net_device *master_dev = NULL;
2942         struct ifinfomsg *ifm;
2943         char kind[MODULE_NAME_LEN];
2944         char ifname[IFNAMSIZ];
2945         struct nlattr *tb[IFLA_MAX+1];
2946         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2947         unsigned char name_assign_type = NET_NAME_USER;
2948         int err;
2949
2950 #ifdef CONFIG_MODULES
2951 replay:
2952 #endif
2953         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2954         if (err < 0)
2955                 return err;
2956
2957         err = rtnl_ensure_unique_netns(tb, extack, false);
2958         if (err < 0)
2959                 return err;
2960
2961         if (tb[IFLA_IFNAME])
2962                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2963         else
2964                 ifname[0] = '\0';
2965
2966         ifm = nlmsg_data(nlh);
2967         if (ifm->ifi_index > 0)
2968                 dev = __dev_get_by_index(net, ifm->ifi_index);
2969         else {
2970                 if (ifname[0])
2971                         dev = __dev_get_by_name(net, ifname);
2972                 else
2973                         dev = NULL;
2974         }
2975
2976         if (dev) {
2977                 master_dev = netdev_master_upper_dev_get(dev);
2978                 if (master_dev)
2979                         m_ops = master_dev->rtnl_link_ops;
2980         }
2981
2982         err = validate_linkmsg(dev, tb);
2983         if (err < 0)
2984                 return err;
2985
2986         if (tb[IFLA_LINKINFO]) {
2987                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2988                                        tb[IFLA_LINKINFO], ifla_info_policy,
2989                                        NULL);
2990                 if (err < 0)
2991                         return err;
2992         } else
2993                 memset(linkinfo, 0, sizeof(linkinfo));
2994
2995         if (linkinfo[IFLA_INFO_KIND]) {
2996                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2997                 ops = rtnl_link_ops_get(kind);
2998         } else {
2999                 kind[0] = '\0';
3000                 ops = NULL;
3001         }
3002
3003         if (1) {
3004                 struct nlattr *attr[RTNL_MAX_TYPE + 1];
3005                 struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3006                 struct nlattr **data = NULL;
3007                 struct nlattr **slave_data = NULL;
3008                 struct net *dest_net, *link_net = NULL;
3009
3010                 if (ops) {
3011                         if (ops->maxtype > RTNL_MAX_TYPE)
3012                                 return -EINVAL;
3013
3014                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3015                                 err = nla_parse_nested(attr, ops->maxtype,
3016                                                        linkinfo[IFLA_INFO_DATA],
3017                                                        ops->policy, NULL);
3018                                 if (err < 0)
3019                                         return err;
3020                                 data = attr;
3021                         }
3022                         if (ops->validate) {
3023                                 err = ops->validate(tb, data, extack);
3024                                 if (err < 0)
3025                                         return err;
3026                         }
3027                 }
3028
3029                 if (m_ops) {
3030                         if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3031                                 return -EINVAL;
3032
3033                         if (m_ops->slave_maxtype &&
3034                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
3035                                 err = nla_parse_nested(slave_attr,
3036                                                        m_ops->slave_maxtype,
3037                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
3038                                                        m_ops->slave_policy,
3039                                                        NULL);
3040                                 if (err < 0)
3041                                         return err;
3042                                 slave_data = slave_attr;
3043                         }
3044                 }
3045
3046                 if (dev) {
3047                         int status = 0;
3048
3049                         if (nlh->nlmsg_flags & NLM_F_EXCL)
3050                                 return -EEXIST;
3051                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
3052                                 return -EOPNOTSUPP;
3053
3054                         if (linkinfo[IFLA_INFO_DATA]) {
3055                                 if (!ops || ops != dev->rtnl_link_ops ||
3056                                     !ops->changelink)
3057                                         return -EOPNOTSUPP;
3058
3059                                 err = ops->changelink(dev, tb, data, extack);
3060                                 if (err < 0)
3061                                         return err;
3062                                 status |= DO_SETLINK_NOTIFY;
3063                         }
3064
3065                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3066                                 if (!m_ops || !m_ops->slave_changelink)
3067                                         return -EOPNOTSUPP;
3068
3069                                 err = m_ops->slave_changelink(master_dev, dev,
3070                                                               tb, slave_data,
3071                                                               extack);
3072                                 if (err < 0)
3073                                         return err;
3074                                 status |= DO_SETLINK_NOTIFY;
3075                         }
3076
3077                         return do_setlink(skb, dev, ifm, extack, tb, ifname,
3078                                           status);
3079                 }
3080
3081                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3082                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3083                                 return rtnl_group_changelink(skb, net,
3084                                                 nla_get_u32(tb[IFLA_GROUP]),
3085                                                 ifm, extack, tb);
3086                         return -ENODEV;
3087                 }
3088
3089                 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3090                         return -EOPNOTSUPP;
3091
3092                 if (!ops) {
3093 #ifdef CONFIG_MODULES
3094                         if (kind[0]) {
3095                                 __rtnl_unlock();
3096                                 request_module("rtnl-link-%s", kind);
3097                                 rtnl_lock();
3098                                 ops = rtnl_link_ops_get(kind);
3099                                 if (ops)
3100                                         goto replay;
3101                         }
3102 #endif
3103                         return -EOPNOTSUPP;
3104                 }
3105
3106                 if (!ops->setup)
3107                         return -EOPNOTSUPP;
3108
3109                 if (!ifname[0]) {
3110                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3111                         name_assign_type = NET_NAME_ENUM;
3112                 }
3113
3114                 dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3115                 if (IS_ERR(dest_net))
3116                         return PTR_ERR(dest_net);
3117
3118                 if (tb[IFLA_LINK_NETNSID]) {
3119                         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3120
3121                         link_net = get_net_ns_by_id(dest_net, id);
3122                         if (!link_net) {
3123                                 err =  -EINVAL;
3124                                 goto out;
3125                         }
3126                         err = -EPERM;
3127                         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3128                                 goto out;
3129                 }
3130
3131                 dev = rtnl_create_link(link_net ? : dest_net, ifname,
3132                                        name_assign_type, ops, tb);
3133                 if (IS_ERR(dev)) {
3134                         err = PTR_ERR(dev);
3135                         goto out;
3136                 }
3137
3138                 dev->ifindex = ifm->ifi_index;
3139
3140                 if (ops->newlink) {
3141                         err = ops->newlink(link_net ? : net, dev, tb, data,
3142                                            extack);
3143                         /* Drivers should call free_netdev() in ->destructor
3144                          * and unregister it on failure after registration
3145                          * so that device could be finally freed in rtnl_unlock.
3146                          */
3147                         if (err < 0) {
3148                                 /* If device is not registered at all, free it now */
3149                                 if (dev->reg_state == NETREG_UNINITIALIZED ||
3150                                     dev->reg_state == NETREG_UNREGISTERED)
3151                                         free_netdev(dev);
3152                                 goto out;
3153                         }
3154                 } else {
3155                         err = register_netdevice(dev);
3156                         if (err < 0) {
3157                                 free_netdev(dev);
3158                                 goto out;
3159                         }
3160                 }
3161                 err = rtnl_configure_link(dev, ifm);
3162                 if (err < 0)
3163                         goto out_unregister;
3164                 if (link_net) {
3165                         err = dev_change_net_namespace(dev, dest_net, ifname);
3166                         if (err < 0)
3167                                 goto out_unregister;
3168                 }
3169                 if (tb[IFLA_MASTER]) {
3170                         err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]),
3171                                             extack);
3172                         if (err)
3173                                 goto out_unregister;
3174                 }
3175 out:
3176                 if (link_net)
3177                         put_net(link_net);
3178                 put_net(dest_net);
3179                 return err;
3180 out_unregister:
3181                 if (ops->newlink) {
3182                         LIST_HEAD(list_kill);
3183
3184                         ops->dellink(dev, &list_kill);
3185                         unregister_netdevice_many(&list_kill);
3186                 } else {
3187                         unregister_netdevice(dev);
3188                 }
3189                 goto out;
3190         }
3191 }
3192
3193 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3194                         struct netlink_ext_ack *extack)
3195 {
3196         struct net *net = sock_net(skb->sk);
3197         struct net *tgt_net = net;
3198         struct ifinfomsg *ifm;
3199         char ifname[IFNAMSIZ];
3200         struct nlattr *tb[IFLA_MAX+1];
3201         struct net_device *dev = NULL;
3202         struct sk_buff *nskb;
3203         int netnsid = -1;
3204         int err;
3205         u32 ext_filter_mask = 0;
3206
3207         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3208         if (err < 0)
3209                 return err;
3210
3211         err = rtnl_ensure_unique_netns(tb, extack, true);
3212         if (err < 0)
3213                 return err;
3214
3215         if (tb[IFLA_IF_NETNSID]) {
3216                 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
3217                 tgt_net = get_target_net(NETLINK_CB(skb).sk, netnsid);
3218                 if (IS_ERR(tgt_net))
3219                         return PTR_ERR(tgt_net);
3220         }
3221
3222         if (tb[IFLA_IFNAME])
3223                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3224
3225         if (tb[IFLA_EXT_MASK])
3226                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3227
3228         err = -EINVAL;
3229         ifm = nlmsg_data(nlh);
3230         if (ifm->ifi_index > 0)
3231                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3232         else if (tb[IFLA_IFNAME])
3233                 dev = __dev_get_by_name(tgt_net, ifname);
3234         else
3235                 goto out;
3236
3237         err = -ENODEV;
3238         if (dev == NULL)
3239                 goto out;
3240
3241         err = -ENOBUFS;
3242         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3243         if (nskb == NULL)
3244                 goto out;
3245
3246         err = rtnl_fill_ifinfo(nskb, dev, net,
3247                                RTM_NEWLINK, NETLINK_CB(skb).portid,
3248                                nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3249                                0, NULL, 0, netnsid, GFP_KERNEL);
3250         if (err < 0) {
3251                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3252                 WARN_ON(err == -EMSGSIZE);
3253                 kfree_skb(nskb);
3254         } else
3255                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3256 out:
3257         if (netnsid >= 0)
3258                 put_net(tgt_net);
3259
3260         return err;
3261 }
3262
3263 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3264 {
3265         struct net *net = sock_net(skb->sk);
3266         struct net_device *dev;
3267         struct nlattr *tb[IFLA_MAX+1];
3268         u32 ext_filter_mask = 0;
3269         u16 min_ifinfo_dump_size = 0;
3270         int hdrlen;
3271
3272         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3273         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3274                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3275
3276         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3277                 if (tb[IFLA_EXT_MASK])
3278                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3279         }
3280
3281         if (!ext_filter_mask)
3282                 return NLMSG_GOODSIZE;
3283         /*
3284          * traverse the list of net devices and compute the minimum
3285          * buffer size based upon the filter mask.
3286          */
3287         rcu_read_lock();
3288         for_each_netdev_rcu(net, dev) {
3289                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
3290                                              if_nlmsg_size(dev,
3291                                                            ext_filter_mask));
3292         }
3293         rcu_read_unlock();
3294
3295         return nlmsg_total_size(min_ifinfo_dump_size);
3296 }
3297
3298 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3299 {
3300         int idx;
3301         int s_idx = cb->family;
3302         int type = cb->nlh->nlmsg_type - RTM_BASE;
3303
3304         if (s_idx == 0)
3305                 s_idx = 1;
3306
3307         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3308                 struct rtnl_link **tab;
3309                 struct rtnl_link *link;
3310                 rtnl_dumpit_func dumpit;
3311
3312                 if (idx < s_idx || idx == PF_PACKET)
3313                         continue;
3314
3315                 if (type < 0 || type >= RTM_NR_MSGTYPES)
3316                         continue;
3317
3318                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3319                 if (!tab)
3320                         continue;
3321
3322                 link = tab[type];
3323                 if (!link)
3324                         continue;
3325
3326                 dumpit = link->dumpit;
3327                 if (!dumpit)
3328                         continue;
3329
3330                 if (idx > s_idx) {
3331                         memset(&cb->args[0], 0, sizeof(cb->args));
3332                         cb->prev_seq = 0;
3333                         cb->seq = 0;
3334                 }
3335                 if (dumpit(skb, cb))
3336                         break;
3337         }
3338         cb->family = idx;
3339
3340         return skb->len;
3341 }
3342
3343 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3344                                        unsigned int change,
3345                                        u32 event, gfp_t flags, int *new_nsid,
3346                                        int new_ifindex)
3347 {
3348         struct net *net = dev_net(dev);
3349         struct sk_buff *skb;
3350         int err = -ENOBUFS;
3351         size_t if_info_size;
3352
3353         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3354         if (skb == NULL)
3355                 goto errout;
3356
3357         err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3358                                type, 0, 0, change, 0, 0, event,
3359                                new_nsid, new_ifindex, -1, flags);
3360         if (err < 0) {
3361                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3362                 WARN_ON(err == -EMSGSIZE);
3363                 kfree_skb(skb);
3364                 goto errout;
3365         }
3366         return skb;
3367 errout:
3368         if (err < 0)
3369                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3370         return NULL;
3371 }
3372
3373 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3374 {
3375         struct net *net = dev_net(dev);
3376
3377         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3378 }
3379
3380 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3381                                unsigned int change, u32 event,
3382                                gfp_t flags, int *new_nsid, int new_ifindex)
3383 {
3384         struct sk_buff *skb;
3385
3386         if (dev->reg_state != NETREG_REGISTERED)
3387                 return;
3388
3389         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3390                                      new_ifindex);
3391         if (skb)
3392                 rtmsg_ifinfo_send(skb, dev, flags);
3393 }
3394
3395 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3396                   gfp_t flags)
3397 {
3398         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3399                            NULL, 0);
3400 }
3401
3402 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3403                          gfp_t flags, int *new_nsid, int new_ifindex)
3404 {
3405         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3406                            new_nsid, new_ifindex);
3407 }
3408
3409 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3410                                    struct net_device *dev,
3411                                    u8 *addr, u16 vid, u32 pid, u32 seq,
3412                                    int type, unsigned int flags,
3413                                    int nlflags, u16 ndm_state)
3414 {
3415         struct nlmsghdr *nlh;
3416         struct ndmsg *ndm;
3417
3418         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3419         if (!nlh)
3420                 return -EMSGSIZE;
3421
3422         ndm = nlmsg_data(nlh);
3423         ndm->ndm_family  = AF_BRIDGE;
3424         ndm->ndm_pad1    = 0;
3425         ndm->ndm_pad2    = 0;
3426         ndm->ndm_flags   = flags;
3427         ndm->ndm_type    = 0;
3428         ndm->ndm_ifindex = dev->ifindex;
3429         ndm->ndm_state   = ndm_state;
3430
3431         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3432                 goto nla_put_failure;
3433         if (vid)
3434                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3435                         goto nla_put_failure;
3436
3437         nlmsg_end(skb, nlh);
3438         return 0;
3439
3440 nla_put_failure:
3441         nlmsg_cancel(skb, nlh);
3442         return -EMSGSIZE;
3443 }
3444
3445 static inline size_t rtnl_fdb_nlmsg_size(void)
3446 {
3447         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3448                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
3449                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
3450                0;
3451 }
3452
3453 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3454                             u16 ndm_state)
3455 {
3456         struct net *net = dev_net(dev);
3457         struct sk_buff *skb;
3458         int err = -ENOBUFS;
3459
3460         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3461         if (!skb)
3462                 goto errout;
3463
3464         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3465                                       0, 0, type, NTF_SELF, 0, ndm_state);
3466         if (err < 0) {
3467                 kfree_skb(skb);
3468                 goto errout;
3469         }
3470
3471         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3472         return;
3473 errout:
3474         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3475 }
3476
3477 /**
3478  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3479  */
3480 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3481                      struct nlattr *tb[],
3482                      struct net_device *dev,
3483                      const unsigned char *addr, u16 vid,
3484                      u16 flags)
3485 {
3486         int err = -EINVAL;
3487
3488         /* If aging addresses are supported device will need to
3489          * implement its own handler for this.
3490          */
3491         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3492                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3493                 return err;
3494         }
3495
3496         if (vid) {
3497                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3498                 return err;
3499         }
3500
3501         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3502                 err = dev_uc_add_excl(dev, addr);
3503         else if (is_multicast_ether_addr(addr))
3504                 err = dev_mc_add_excl(dev, addr);
3505
3506         /* Only return duplicate errors if NLM_F_EXCL is set */
3507         if (err == -EEXIST && !(flags & NLM_F_EXCL))
3508                 err = 0;
3509
3510         return err;
3511 }
3512 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3513
3514 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3515                          struct netlink_ext_ack *extack)
3516 {
3517         u16 vid = 0;
3518
3519         if (vlan_attr) {
3520                 if (nla_len(vlan_attr) != sizeof(u16)) {
3521                         NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3522                         return -EINVAL;
3523                 }
3524
3525                 vid = nla_get_u16(vlan_attr);
3526
3527                 if (!vid || vid >= VLAN_VID_MASK) {
3528                         NL_SET_ERR_MSG(extack, "invalid vlan id");
3529                         return -EINVAL;
3530                 }
3531         }
3532         *p_vid = vid;
3533         return 0;
3534 }
3535
3536 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3537                         struct netlink_ext_ack *extack)
3538 {
3539         struct net *net = sock_net(skb->sk);
3540         struct ndmsg *ndm;
3541         struct nlattr *tb[NDA_MAX+1];
3542         struct net_device *dev;
3543         u8 *addr;
3544         u16 vid;
3545         int err;
3546
3547         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3548         if (err < 0)
3549                 return err;
3550
3551         ndm = nlmsg_data(nlh);
3552         if (ndm->ndm_ifindex == 0) {
3553                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3554                 return -EINVAL;
3555         }
3556
3557         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3558         if (dev == NULL) {
3559                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3560                 return -ENODEV;
3561         }
3562
3563         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3564                 NL_SET_ERR_MSG(extack, "invalid address");
3565                 return -EINVAL;
3566         }
3567
3568         if (dev->type != ARPHRD_ETHER) {
3569                 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
3570                 return -EINVAL;
3571         }
3572
3573         addr = nla_data(tb[NDA_LLADDR]);
3574
3575         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3576         if (err)
3577                 return err;
3578
3579         err = -EOPNOTSUPP;
3580
3581         /* Support fdb on master device the net/bridge default case */
3582         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3583             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3584                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3585                 const struct net_device_ops *ops = br_dev->netdev_ops;
3586
3587                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3588                                        nlh->nlmsg_flags);
3589                 if (err)
3590                         goto out;
3591                 else
3592                         ndm->ndm_flags &= ~NTF_MASTER;
3593         }
3594
3595         /* Embedded bridge, macvlan, and any other device support */
3596         if ((ndm->ndm_flags & NTF_SELF)) {
3597                 if (dev->netdev_ops->ndo_fdb_add)
3598                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3599                                                            vid,
3600                                                            nlh->nlmsg_flags);
3601                 else
3602                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3603                                                nlh->nlmsg_flags);
3604
3605                 if (!err) {
3606                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3607                                         ndm->ndm_state);
3608                         ndm->ndm_flags &= ~NTF_SELF;
3609                 }
3610         }
3611 out:
3612         return err;
3613 }
3614
3615 /**
3616  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3617  */
3618 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3619                      struct nlattr *tb[],
3620                      struct net_device *dev,
3621                      const unsigned char *addr, u16 vid)
3622 {
3623         int err = -EINVAL;
3624
3625         /* If aging addresses are supported device will need to
3626          * implement its own handler for this.
3627          */
3628         if (!(ndm->ndm_state & NUD_PERMANENT)) {
3629                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3630                 return err;
3631         }
3632
3633         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3634                 err = dev_uc_del(dev, addr);
3635         else if (is_multicast_ether_addr(addr))
3636                 err = dev_mc_del(dev, addr);
3637
3638         return err;
3639 }
3640 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3641
3642 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3643                         struct netlink_ext_ack *extack)
3644 {
3645         struct net *net = sock_net(skb->sk);
3646         struct ndmsg *ndm;
3647         struct nlattr *tb[NDA_MAX+1];
3648         struct net_device *dev;
3649         int err = -EINVAL;
3650         __u8 *addr;
3651         u16 vid;
3652
3653         if (!netlink_capable(skb, CAP_NET_ADMIN))
3654                 return -EPERM;
3655
3656         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3657         if (err < 0)
3658                 return err;
3659
3660         ndm = nlmsg_data(nlh);
3661         if (ndm->ndm_ifindex == 0) {
3662                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3663                 return -EINVAL;
3664         }
3665
3666         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3667         if (dev == NULL) {
3668                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3669                 return -ENODEV;
3670         }
3671
3672         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3673                 NL_SET_ERR_MSG(extack, "invalid address");
3674                 return -EINVAL;
3675         }
3676
3677         if (dev->type != ARPHRD_ETHER) {
3678                 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
3679                 return -EINVAL;
3680         }
3681
3682         addr = nla_data(tb[NDA_LLADDR]);
3683
3684         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3685         if (err)
3686                 return err;
3687
3688         err = -EOPNOTSUPP;
3689
3690         /* Support fdb on master device the net/bridge default case */
3691         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3692             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3693                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3694                 const struct net_device_ops *ops = br_dev->netdev_ops;
3695
3696                 if (ops->ndo_fdb_del)
3697                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3698
3699                 if (err)
3700                         goto out;
3701                 else
3702                         ndm->ndm_flags &= ~NTF_MASTER;
3703         }
3704
3705         /* Embedded bridge, macvlan, and any other device support */
3706         if (ndm->ndm_flags & NTF_SELF) {
3707                 if (dev->netdev_ops->ndo_fdb_del)
3708                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3709                                                            vid);
3710                 else
3711                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3712
3713                 if (!err) {
3714                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3715                                         ndm->ndm_state);
3716                         ndm->ndm_flags &= ~NTF_SELF;
3717                 }
3718         }
3719 out:
3720         return err;
3721 }
3722
3723 static int nlmsg_populate_fdb(struct sk_buff *skb,
3724                               struct netlink_callback *cb,
3725                               struct net_device *dev,
3726                               int *idx,
3727                               struct netdev_hw_addr_list *list)
3728 {
3729         struct netdev_hw_addr *ha;
3730         int err;
3731         u32 portid, seq;
3732
3733         portid = NETLINK_CB(cb->skb).portid;
3734         seq = cb->nlh->nlmsg_seq;
3735
3736         list_for_each_entry(ha, &list->list, list) {
3737                 if (*idx < cb->args[2])
3738                         goto skip;
3739
3740                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3741                                               portid, seq,
3742                                               RTM_NEWNEIGH, NTF_SELF,
3743                                               NLM_F_MULTI, NUD_PERMANENT);
3744                 if (err < 0)
3745                         return err;
3746 skip:
3747                 *idx += 1;
3748         }
3749         return 0;
3750 }
3751
3752 /**
3753  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3754  * @nlh: netlink message header
3755  * @dev: netdevice
3756  *
3757  * Default netdevice operation to dump the existing unicast address list.
3758  * Returns number of addresses from list put in skb.
3759  */
3760 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3761                       struct netlink_callback *cb,
3762                       struct net_device *dev,
3763                       struct net_device *filter_dev,
3764                       int *idx)
3765 {
3766         int err;
3767
3768         if (dev->type != ARPHRD_ETHER)
3769                 return -EINVAL;
3770
3771         netif_addr_lock_bh(dev);
3772         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3773         if (err)
3774                 goto out;
3775         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3776 out:
3777         netif_addr_unlock_bh(dev);
3778         return err;
3779 }
3780 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3781
3782 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3783 {
3784         struct net_device *dev;
3785         struct nlattr *tb[IFLA_MAX+1];
3786         struct net_device *br_dev = NULL;
3787         const struct net_device_ops *ops = NULL;
3788         const struct net_device_ops *cops = NULL;
3789         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3790         struct net *net = sock_net(skb->sk);
3791         struct hlist_head *head;
3792         int brport_idx = 0;
3793         int br_idx = 0;
3794         int h, s_h;
3795         int idx = 0, s_idx;
3796         int err = 0;
3797         int fidx = 0;
3798
3799         /* A hack to preserve kernel<->userspace interface.
3800          * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
3801          * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
3802          * So, check for ndmsg with an optional u32 attribute (not used here).
3803          * Fortunately these sizes don't conflict with the size of ifinfomsg
3804          * with an optional attribute.
3805          */
3806         if (nlmsg_len(cb->nlh) != sizeof(struct ndmsg) &&
3807             (nlmsg_len(cb->nlh) != sizeof(struct ndmsg) +
3808              nla_attr_size(sizeof(u32)))) {
3809                 err = nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb,
3810                                   IFLA_MAX, ifla_policy, NULL);
3811                 if (err < 0) {
3812                         return -EINVAL;
3813                 } else if (err == 0) {
3814                         if (tb[IFLA_MASTER])
3815                                 br_idx = nla_get_u32(tb[IFLA_MASTER]);
3816                 }
3817
3818                 brport_idx = ifm->ifi_index;
3819         }
3820
3821         if (br_idx) {
3822                 br_dev = __dev_get_by_index(net, br_idx);
3823                 if (!br_dev)
3824                         return -ENODEV;
3825
3826                 ops = br_dev->netdev_ops;
3827         }
3828
3829         s_h = cb->args[0];
3830         s_idx = cb->args[1];
3831
3832         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3833                 idx = 0;
3834                 head = &net->dev_index_head[h];
3835                 hlist_for_each_entry(dev, head, index_hlist) {
3836
3837                         if (brport_idx && (dev->ifindex != brport_idx))
3838                                 continue;
3839
3840                         if (!br_idx) { /* user did not specify a specific bridge */
3841                                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3842                                         br_dev = netdev_master_upper_dev_get(dev);
3843                                         cops = br_dev->netdev_ops;
3844                                 }
3845                         } else {
3846                                 if (dev != br_dev &&
3847                                     !(dev->priv_flags & IFF_BRIDGE_PORT))
3848                                         continue;
3849
3850                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
3851                                     !(dev->priv_flags & IFF_EBRIDGE))
3852                                         continue;
3853                                 cops = ops;
3854                         }
3855
3856                         if (idx < s_idx)
3857                                 goto cont;
3858
3859                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
3860                                 if (cops && cops->ndo_fdb_dump) {
3861                                         err = cops->ndo_fdb_dump(skb, cb,
3862                                                                 br_dev, dev,
3863                                                                 &fidx);
3864                                         if (err == -EMSGSIZE)
3865                                                 goto out;
3866                                 }
3867                         }
3868
3869                         if (dev->netdev_ops->ndo_fdb_dump)
3870                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
3871                                                                     dev, NULL,
3872                                                                     &fidx);
3873                         else
3874                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
3875                                                         &fidx);
3876                         if (err == -EMSGSIZE)
3877                                 goto out;
3878
3879                         cops = NULL;
3880
3881                         /* reset fdb offset to 0 for rest of the interfaces */
3882                         cb->args[2] = 0;
3883                         fidx = 0;
3884 cont:
3885                         idx++;
3886                 }
3887         }
3888
3889 out:
3890         cb->args[0] = h;
3891         cb->args[1] = idx;
3892         cb->args[2] = fidx;
3893
3894         return skb->len;
3895 }
3896
3897 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3898                                unsigned int attrnum, unsigned int flag)
3899 {
3900         if (mask & flag)
3901                 return nla_put_u8(skb, attrnum, !!(flags & flag));
3902         return 0;
3903 }
3904
3905 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3906                             struct net_device *dev, u16 mode,
3907                             u32 flags, u32 mask, int nlflags,
3908                             u32 filter_mask,
3909                             int (*vlan_fill)(struct sk_buff *skb,
3910                                              struct net_device *dev,
3911                                              u32 filter_mask))
3912 {
3913         struct nlmsghdr *nlh;
3914         struct ifinfomsg *ifm;
3915         struct nlattr *br_afspec;
3916         struct nlattr *protinfo;
3917         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3918         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3919         int err = 0;
3920
3921         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3922         if (nlh == NULL)
3923                 return -EMSGSIZE;
3924
3925         ifm = nlmsg_data(nlh);
3926         ifm->ifi_family = AF_BRIDGE;
3927         ifm->__ifi_pad = 0;
3928         ifm->ifi_type = dev->type;
3929         ifm->ifi_index = dev->ifindex;
3930         ifm->ifi_flags = dev_get_flags(dev);
3931         ifm->ifi_change = 0;
3932
3933
3934         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3935             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3936             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3937             (br_dev &&
3938              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3939             (dev->addr_len &&
3940              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3941             (dev->ifindex != dev_get_iflink(dev) &&
3942              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3943                 goto nla_put_failure;
3944
3945         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3946         if (!br_afspec)
3947                 goto nla_put_failure;
3948
3949         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3950                 nla_nest_cancel(skb, br_afspec);
3951                 goto nla_put_failure;
3952         }
3953
3954         if (mode != BRIDGE_MODE_UNDEF) {
3955                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3956                         nla_nest_cancel(skb, br_afspec);
3957                         goto nla_put_failure;
3958                 }
3959         }
3960         if (vlan_fill) {
3961                 err = vlan_fill(skb, dev, filter_mask);
3962                 if (err) {
3963                         nla_nest_cancel(skb, br_afspec);
3964                         goto nla_put_failure;
3965                 }
3966         }
3967         nla_nest_end(skb, br_afspec);
3968
3969         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3970         if (!protinfo)
3971                 goto nla_put_failure;
3972
3973         if (brport_nla_put_flag(skb, flags, mask,
3974                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3975             brport_nla_put_flag(skb, flags, mask,
3976                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3977             brport_nla_put_flag(skb, flags, mask,
3978                                 IFLA_BRPORT_FAST_LEAVE,
3979                                 BR_MULTICAST_FAST_LEAVE) ||
3980             brport_nla_put_flag(skb, flags, mask,
3981                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3982             brport_nla_put_flag(skb, flags, mask,
3983                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3984             brport_nla_put_flag(skb, flags, mask,
3985                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3986             brport_nla_put_flag(skb, flags, mask,
3987                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3988             brport_nla_put_flag(skb, flags, mask,
3989                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3990                 nla_nest_cancel(skb, protinfo);
3991                 goto nla_put_failure;
3992         }
3993
3994         nla_nest_end(skb, protinfo);
3995
3996         nlmsg_end(skb, nlh);
3997         return 0;
3998 nla_put_failure:
3999         nlmsg_cancel(skb, nlh);
4000         return err ? err : -EMSGSIZE;
4001 }
4002 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4003
4004 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4005 {
4006         struct net *net = sock_net(skb->sk);
4007         struct net_device *dev;
4008         int idx = 0;
4009         u32 portid = NETLINK_CB(cb->skb).portid;
4010         u32 seq = cb->nlh->nlmsg_seq;
4011         u32 filter_mask = 0;
4012         int err;
4013
4014         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
4015                 struct nlattr *extfilt;
4016
4017                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
4018                                           IFLA_EXT_MASK);
4019                 if (extfilt) {
4020                         if (nla_len(extfilt) < sizeof(filter_mask))
4021                                 return -EINVAL;
4022
4023                         filter_mask = nla_get_u32(extfilt);
4024                 }
4025         }
4026
4027         rcu_read_lock();
4028         for_each_netdev_rcu(net, dev) {
4029                 const struct net_device_ops *ops = dev->netdev_ops;
4030                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4031
4032                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4033                         if (idx >= cb->args[0]) {
4034                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
4035                                                 skb, portid, seq, dev,
4036                                                 filter_mask, NLM_F_MULTI);
4037                                 if (err < 0 && err != -EOPNOTSUPP) {
4038                                         if (likely(skb->len))
4039                                                 break;
4040
4041                                         goto out_err;
4042                                 }
4043                         }
4044                         idx++;
4045                 }
4046
4047                 if (ops->ndo_bridge_getlink) {
4048                         if (idx >= cb->args[0]) {
4049                                 err = ops->ndo_bridge_getlink(skb, portid,
4050                                                               seq, dev,
4051                                                               filter_mask,
4052                                                               NLM_F_MULTI);
4053                                 if (err < 0 && err != -EOPNOTSUPP) {
4054                                         if (likely(skb->len))
4055                                                 break;
4056
4057                                         goto out_err;
4058                                 }
4059                         }
4060                         idx++;
4061                 }
4062         }
4063         err = skb->len;
4064 out_err:
4065         rcu_read_unlock();
4066         cb->args[0] = idx;
4067
4068         return err;
4069 }
4070
4071 static inline size_t bridge_nlmsg_size(void)
4072 {
4073         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4074                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
4075                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
4076                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
4077                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
4078                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
4079                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
4080                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
4081                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
4082                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
4083                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
4084 }
4085
4086 static int rtnl_bridge_notify(struct net_device *dev)
4087 {
4088         struct net *net = dev_net(dev);
4089         struct sk_buff *skb;
4090         int err = -EOPNOTSUPP;
4091
4092         if (!dev->netdev_ops->ndo_bridge_getlink)
4093                 return 0;
4094
4095         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4096         if (!skb) {
4097                 err = -ENOMEM;
4098                 goto errout;
4099         }
4100
4101         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4102         if (err < 0)
4103                 goto errout;
4104
4105         /* Notification info is only filled for bridge ports, not the bridge
4106          * device itself. Therefore, a zero notification length is valid and
4107          * should not result in an error.
4108          */
4109         if (!skb->len)
4110                 goto errout;
4111
4112         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4113         return 0;
4114 errout:
4115         WARN_ON(err == -EMSGSIZE);
4116         kfree_skb(skb);
4117         if (err)
4118                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4119         return err;
4120 }
4121
4122 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4123                                struct netlink_ext_ack *extack)
4124 {
4125         struct net *net = sock_net(skb->sk);
4126         struct ifinfomsg *ifm;
4127         struct net_device *dev;
4128         struct nlattr *br_spec, *attr = NULL;
4129         int rem, err = -EOPNOTSUPP;
4130         u16 flags = 0;
4131         bool have_flags = false;
4132
4133         if (nlmsg_len(nlh) < sizeof(*ifm))
4134                 return -EINVAL;
4135
4136         ifm = nlmsg_data(nlh);
4137         if (ifm->ifi_family != AF_BRIDGE)
4138                 return -EPFNOSUPPORT;
4139
4140         dev = __dev_get_by_index(net, ifm->ifi_index);
4141         if (!dev) {
4142                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4143                 return -ENODEV;
4144         }
4145
4146         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4147         if (br_spec) {
4148                 nla_for_each_nested(attr, br_spec, rem) {
4149                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4150                                 if (nla_len(attr) < sizeof(flags))
4151                                         return -EINVAL;
4152
4153                                 have_flags = true;
4154                                 flags = nla_get_u16(attr);
4155                                 break;
4156                         }
4157                 }
4158         }
4159
4160         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4161                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4162
4163                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4164                         err = -EOPNOTSUPP;
4165                         goto out;
4166                 }
4167
4168                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
4169                 if (err)
4170                         goto out;
4171
4172                 flags &= ~BRIDGE_FLAGS_MASTER;
4173         }
4174
4175         if ((flags & BRIDGE_FLAGS_SELF)) {
4176                 if (!dev->netdev_ops->ndo_bridge_setlink)
4177                         err = -EOPNOTSUPP;
4178                 else
4179                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4180                                                                   flags);
4181                 if (!err) {
4182                         flags &= ~BRIDGE_FLAGS_SELF;
4183
4184                         /* Generate event to notify upper layer of bridge
4185                          * change
4186                          */
4187                         err = rtnl_bridge_notify(dev);
4188                 }
4189         }
4190
4191         if (have_flags)
4192                 memcpy(nla_data(attr), &flags, sizeof(flags));
4193 out:
4194         return err;
4195 }
4196
4197 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4198                                struct netlink_ext_ack *extack)
4199 {
4200         struct net *net = sock_net(skb->sk);
4201         struct ifinfomsg *ifm;
4202         struct net_device *dev;
4203         struct nlattr *br_spec, *attr = NULL;
4204         int rem, err = -EOPNOTSUPP;
4205         u16 flags = 0;
4206         bool have_flags = false;
4207
4208         if (nlmsg_len(nlh) < sizeof(*ifm))
4209                 return -EINVAL;
4210
4211         ifm = nlmsg_data(nlh);
4212         if (ifm->ifi_family != AF_BRIDGE)
4213                 return -EPFNOSUPPORT;
4214
4215         dev = __dev_get_by_index(net, ifm->ifi_index);
4216         if (!dev) {
4217                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4218                 return -ENODEV;
4219         }
4220
4221         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4222         if (br_spec) {
4223                 nla_for_each_nested(attr, br_spec, rem) {
4224                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4225                                 if (nla_len(attr) < sizeof(flags))
4226                                         return -EINVAL;
4227
4228                                 have_flags = true;
4229                                 flags = nla_get_u16(attr);
4230                                 break;
4231                         }
4232                 }
4233         }
4234
4235         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4236                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4237
4238                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4239                         err = -EOPNOTSUPP;
4240                         goto out;
4241                 }
4242
4243                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4244                 if (err)
4245                         goto out;
4246
4247                 flags &= ~BRIDGE_FLAGS_MASTER;
4248         }
4249
4250         if ((flags & BRIDGE_FLAGS_SELF)) {
4251                 if (!dev->netdev_ops->ndo_bridge_dellink)
4252                         err = -EOPNOTSUPP;
4253                 else
4254                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
4255                                                                   flags);
4256
4257                 if (!err) {
4258                         flags &= ~BRIDGE_FLAGS_SELF;
4259
4260                         /* Generate event to notify upper layer of bridge
4261                          * change
4262                          */
4263                         err = rtnl_bridge_notify(dev);
4264                 }
4265         }
4266
4267         if (have_flags)
4268                 memcpy(nla_data(attr), &flags, sizeof(flags));
4269 out:
4270         return err;
4271 }
4272
4273 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
4274 {
4275         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
4276                (!idxattr || idxattr == attrid);
4277 }
4278
4279 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
4280 static int rtnl_get_offload_stats_attr_size(int attr_id)
4281 {
4282         switch (attr_id) {
4283         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
4284                 return sizeof(struct rtnl_link_stats64);
4285         }
4286
4287         return 0;
4288 }
4289
4290 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
4291                                   int *prividx)
4292 {
4293         struct nlattr *attr = NULL;
4294         int attr_id, size;
4295         void *attr_data;
4296         int err;
4297
4298         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4299               dev->netdev_ops->ndo_get_offload_stats))
4300                 return -ENODATA;
4301
4302         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4303              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4304                 if (attr_id < *prividx)
4305                         continue;
4306
4307                 size = rtnl_get_offload_stats_attr_size(attr_id);
4308                 if (!size)
4309                         continue;
4310
4311                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4312                         continue;
4313
4314                 attr = nla_reserve_64bit(skb, attr_id, size,
4315                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
4316                 if (!attr)
4317                         goto nla_put_failure;
4318
4319                 attr_data = nla_data(attr);
4320                 memset(attr_data, 0, size);
4321                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
4322                                                              attr_data);
4323                 if (err)
4324                         goto get_offload_stats_failure;
4325         }
4326
4327         if (!attr)
4328                 return -ENODATA;
4329
4330         *prividx = 0;
4331         return 0;
4332
4333 nla_put_failure:
4334         err = -EMSGSIZE;
4335 get_offload_stats_failure:
4336         *prividx = attr_id;
4337         return err;
4338 }
4339
4340 static int rtnl_get_offload_stats_size(const struct net_device *dev)
4341 {
4342         int nla_size = 0;
4343         int attr_id;
4344         int size;
4345
4346         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4347               dev->netdev_ops->ndo_get_offload_stats))
4348                 return 0;
4349
4350         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4351              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4352                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4353                         continue;
4354                 size = rtnl_get_offload_stats_attr_size(attr_id);
4355                 nla_size += nla_total_size_64bit(size);
4356         }
4357
4358         if (nla_size != 0)
4359                 nla_size += nla_total_size(0);
4360
4361         return nla_size;
4362 }
4363
4364 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
4365                                int type, u32 pid, u32 seq, u32 change,
4366                                unsigned int flags, unsigned int filter_mask,
4367                                int *idxattr, int *prividx)
4368 {
4369         struct if_stats_msg *ifsm;
4370         struct nlmsghdr *nlh;
4371         struct nlattr *attr;
4372         int s_prividx = *prividx;
4373         int err;
4374
4375         ASSERT_RTNL();
4376
4377         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
4378         if (!nlh)
4379                 return -EMSGSIZE;
4380
4381         ifsm = nlmsg_data(nlh);
4382         ifsm->family = PF_UNSPEC;
4383         ifsm->pad1 = 0;
4384         ifsm->pad2 = 0;
4385         ifsm->ifindex = dev->ifindex;
4386         ifsm->filter_mask = filter_mask;
4387
4388         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
4389                 struct rtnl_link_stats64 *sp;
4390
4391                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
4392                                          sizeof(struct rtnl_link_stats64),
4393                                          IFLA_STATS_UNSPEC);
4394                 if (!attr)
4395                         goto nla_put_failure;
4396
4397                 sp = nla_data(attr);
4398                 dev_get_stats(dev, sp);
4399         }
4400
4401         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
4402                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4403
4404                 if (ops && ops->fill_linkxstats) {
4405                         *idxattr = IFLA_STATS_LINK_XSTATS;
4406                         attr = nla_nest_start(skb,
4407                                               IFLA_STATS_LINK_XSTATS);
4408                         if (!attr)
4409                                 goto nla_put_failure;
4410
4411                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4412                         nla_nest_end(skb, attr);
4413                         if (err)
4414                                 goto nla_put_failure;
4415                         *idxattr = 0;
4416                 }
4417         }
4418
4419         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
4420                              *idxattr)) {
4421                 const struct rtnl_link_ops *ops = NULL;
4422                 const struct net_device *master;
4423
4424                 master = netdev_master_upper_dev_get(dev);
4425                 if (master)
4426                         ops = master->rtnl_link_ops;
4427                 if (ops && ops->fill_linkxstats) {
4428                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
4429                         attr = nla_nest_start(skb,
4430                                               IFLA_STATS_LINK_XSTATS_SLAVE);
4431                         if (!attr)
4432                                 goto nla_put_failure;
4433
4434                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4435                         nla_nest_end(skb, attr);
4436                         if (err)
4437                                 goto nla_put_failure;
4438                         *idxattr = 0;
4439                 }
4440         }
4441
4442         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
4443                              *idxattr)) {
4444                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
4445                 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
4446                 if (!attr)
4447                         goto nla_put_failure;
4448
4449                 err = rtnl_get_offload_stats(skb, dev, prividx);
4450                 if (err == -ENODATA)
4451                         nla_nest_cancel(skb, attr);
4452                 else
4453                         nla_nest_end(skb, attr);
4454
4455                 if (err && err != -ENODATA)
4456                         goto nla_put_failure;
4457                 *idxattr = 0;
4458         }
4459
4460         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
4461                 struct rtnl_af_ops *af_ops;
4462
4463                 *idxattr = IFLA_STATS_AF_SPEC;
4464                 attr = nla_nest_start(skb, IFLA_STATS_AF_SPEC);
4465                 if (!attr)
4466                         goto nla_put_failure;
4467
4468                 rcu_read_lock();
4469                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4470                         if (af_ops->fill_stats_af) {
4471                                 struct nlattr *af;
4472                                 int err;
4473
4474                                 af = nla_nest_start(skb, af_ops->family);
4475                                 if (!af) {
4476                                         rcu_read_unlock();
4477                                         goto nla_put_failure;
4478                                 }
4479                                 err = af_ops->fill_stats_af(skb, dev);
4480
4481                                 if (err == -ENODATA) {
4482                                         nla_nest_cancel(skb, af);
4483                                 } else if (err < 0) {
4484                                         rcu_read_unlock();
4485                                         goto nla_put_failure;
4486                                 }
4487
4488                                 nla_nest_end(skb, af);
4489                         }
4490                 }
4491                 rcu_read_unlock();
4492
4493                 nla_nest_end(skb, attr);
4494
4495                 *idxattr = 0;
4496         }
4497
4498         nlmsg_end(skb, nlh);
4499
4500         return 0;
4501
4502 nla_put_failure:
4503         /* not a multi message or no progress mean a real error */
4504         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
4505                 nlmsg_cancel(skb, nlh);
4506         else
4507                 nlmsg_end(skb, nlh);
4508
4509         return -EMSGSIZE;
4510 }
4511
4512 static size_t if_nlmsg_stats_size(const struct net_device *dev,
4513                                   u32 filter_mask)
4514 {
4515         size_t size = NLMSG_ALIGN(sizeof(struct if_stats_msg));
4516
4517         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
4518                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
4519
4520         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
4521                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4522                 int attr = IFLA_STATS_LINK_XSTATS;
4523
4524                 if (ops && ops->get_linkxstats_size) {
4525                         size += nla_total_size(ops->get_linkxstats_size(dev,
4526                                                                         attr));
4527                         /* for IFLA_STATS_LINK_XSTATS */
4528                         size += nla_total_size(0);
4529                 }
4530         }
4531
4532         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
4533                 struct net_device *_dev = (struct net_device *)dev;
4534                 const struct rtnl_link_ops *ops = NULL;
4535                 const struct net_device *master;
4536
4537                 /* netdev_master_upper_dev_get can't take const */
4538                 master = netdev_master_upper_dev_get(_dev);
4539                 if (master)
4540                         ops = master->rtnl_link_ops;
4541                 if (ops && ops->get_linkxstats_size) {
4542                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
4543
4544                         size += nla_total_size(ops->get_linkxstats_size(dev,
4545                                                                         attr));
4546                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
4547                         size += nla_total_size(0);
4548                 }
4549         }
4550
4551         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
4552                 size += rtnl_get_offload_stats_size(dev);
4553
4554         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
4555                 struct rtnl_af_ops *af_ops;
4556
4557                 /* for IFLA_STATS_AF_SPEC */
4558                 size += nla_total_size(0);
4559
4560                 rcu_read_lock();
4561                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4562                         if (af_ops->get_stats_af_size) {
4563                                 size += nla_total_size(
4564                                         af_ops->get_stats_af_size(dev));
4565
4566                                 /* for AF_* */
4567                                 size += nla_total_size(0);
4568                         }
4569                 }
4570                 rcu_read_unlock();
4571         }
4572
4573         return size;
4574 }
4575
4576 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
4577                           struct netlink_ext_ack *extack)
4578 {
4579         struct net *net = sock_net(skb->sk);
4580         struct net_device *dev = NULL;
4581         int idxattr = 0, prividx = 0;
4582         struct if_stats_msg *ifsm;
4583         struct sk_buff *nskb;
4584         u32 filter_mask;
4585         int err;
4586
4587         if (nlmsg_len(nlh) < sizeof(*ifsm))
4588                 return -EINVAL;
4589
4590         ifsm = nlmsg_data(nlh);
4591         if (ifsm->ifindex > 0)
4592                 dev = __dev_get_by_index(net, ifsm->ifindex);
4593         else
4594                 return -EINVAL;
4595
4596         if (!dev)
4597                 return -ENODEV;
4598
4599         filter_mask = ifsm->filter_mask;
4600         if (!filter_mask)
4601                 return -EINVAL;
4602
4603         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
4604         if (!nskb)
4605                 return -ENOBUFS;
4606
4607         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
4608                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
4609                                   0, filter_mask, &idxattr, &prividx);
4610         if (err < 0) {
4611                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
4612                 WARN_ON(err == -EMSGSIZE);
4613                 kfree_skb(nskb);
4614         } else {
4615                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
4616         }
4617
4618         return err;
4619 }
4620
4621 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
4622 {
4623         int h, s_h, err, s_idx, s_idxattr, s_prividx;
4624         struct net *net = sock_net(skb->sk);
4625         unsigned int flags = NLM_F_MULTI;
4626         struct if_stats_msg *ifsm;
4627         struct hlist_head *head;
4628         struct net_device *dev;
4629         u32 filter_mask = 0;
4630         int idx = 0;
4631
4632         s_h = cb->args[0];
4633         s_idx = cb->args[1];
4634         s_idxattr = cb->args[2];
4635         s_prividx = cb->args[3];
4636
4637         cb->seq = net->dev_base_seq;
4638
4639         if (nlmsg_len(cb->nlh) < sizeof(*ifsm))
4640                 return -EINVAL;
4641
4642         ifsm = nlmsg_data(cb->nlh);
4643         filter_mask = ifsm->filter_mask;
4644         if (!filter_mask)
4645                 return -EINVAL;
4646
4647         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4648                 idx = 0;
4649                 head = &net->dev_index_head[h];
4650                 hlist_for_each_entry(dev, head, index_hlist) {
4651                         if (idx < s_idx)
4652                                 goto cont;
4653                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
4654                                                   NETLINK_CB(cb->skb).portid,
4655                                                   cb->nlh->nlmsg_seq, 0,
4656                                                   flags, filter_mask,
4657                                                   &s_idxattr, &s_prividx);
4658                         /* If we ran out of room on the first message,
4659                          * we're in trouble
4660                          */
4661                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
4662
4663                         if (err < 0)
4664                                 goto out;
4665                         s_prividx = 0;
4666                         s_idxattr = 0;
4667                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4668 cont:
4669                         idx++;
4670                 }
4671         }
4672 out:
4673         cb->args[3] = s_prividx;
4674         cb->args[2] = s_idxattr;
4675         cb->args[1] = idx;
4676         cb->args[0] = h;
4677
4678         return skb->len;
4679 }
4680
4681 /* Process one rtnetlink message. */
4682
4683 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
4684                              struct netlink_ext_ack *extack)
4685 {
4686         struct net *net = sock_net(skb->sk);
4687         struct rtnl_link *link;
4688         struct module *owner;
4689         int err = -EOPNOTSUPP;
4690         rtnl_doit_func doit;
4691         unsigned int flags;
4692         int kind;
4693         int family;
4694         int type;
4695
4696         type = nlh->nlmsg_type;
4697         if (type > RTM_MAX)
4698                 return -EOPNOTSUPP;
4699
4700         type -= RTM_BASE;
4701
4702         /* All the messages must have at least 1 byte length */
4703         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
4704                 return 0;
4705
4706         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
4707         kind = type&3;
4708
4709         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
4710                 return -EPERM;
4711
4712         rcu_read_lock();
4713         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
4714                 struct sock *rtnl;
4715                 rtnl_dumpit_func dumpit;
4716                 u16 min_dump_alloc = 0;
4717
4718                 link = rtnl_get_link(family, type);
4719                 if (!link || !link->dumpit) {
4720                         family = PF_UNSPEC;
4721                         link = rtnl_get_link(family, type);
4722                         if (!link || !link->dumpit)
4723                                 goto err_unlock;
4724                 }
4725                 owner = link->owner;
4726                 dumpit = link->dumpit;
4727
4728                 if (type == RTM_GETLINK - RTM_BASE)
4729                         min_dump_alloc = rtnl_calcit(skb, nlh);
4730
4731                 err = 0;
4732                 /* need to do this before rcu_read_unlock() */
4733                 if (!try_module_get(owner))
4734                         err = -EPROTONOSUPPORT;
4735
4736                 rcu_read_unlock();
4737
4738                 rtnl = net->rtnl;
4739                 if (err == 0) {
4740                         struct netlink_dump_control c = {
4741                                 .dump           = dumpit,
4742                                 .min_dump_alloc = min_dump_alloc,
4743                                 .module         = owner,
4744                         };
4745                         err = netlink_dump_start(rtnl, skb, nlh, &c);
4746                         /* netlink_dump_start() will keep a reference on
4747                          * module if dump is still in progress.
4748                          */
4749                         module_put(owner);
4750                 }
4751                 return err;
4752         }
4753
4754         link = rtnl_get_link(family, type);
4755         if (!link || !link->doit) {
4756                 family = PF_UNSPEC;
4757                 link = rtnl_get_link(PF_UNSPEC, type);
4758                 if (!link || !link->doit)
4759                         goto out_unlock;
4760         }
4761
4762         owner = link->owner;
4763         if (!try_module_get(owner)) {
4764                 err = -EPROTONOSUPPORT;
4765                 goto out_unlock;
4766         }
4767
4768         flags = link->flags;
4769         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
4770                 doit = link->doit;
4771                 rcu_read_unlock();
4772                 if (doit)
4773                         err = doit(skb, nlh, extack);
4774                 module_put(owner);
4775                 return err;
4776         }
4777         rcu_read_unlock();
4778
4779         rtnl_lock();
4780         link = rtnl_get_link(family, type);
4781         if (link && link->doit)
4782                 err = link->doit(skb, nlh, extack);
4783         rtnl_unlock();
4784
4785         module_put(owner);
4786
4787         return err;
4788
4789 out_unlock:
4790         rcu_read_unlock();
4791         return err;
4792
4793 err_unlock:
4794         rcu_read_unlock();
4795         return -EOPNOTSUPP;
4796 }
4797
4798 static void rtnetlink_rcv(struct sk_buff *skb)
4799 {
4800         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
4801 }
4802
4803 static int rtnetlink_bind(struct net *net, int group)
4804 {
4805         switch (group) {
4806         case RTNLGRP_IPV4_MROUTE_R:
4807         case RTNLGRP_IPV6_MROUTE_R:
4808                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4809                         return -EPERM;
4810                 break;
4811         }
4812         return 0;
4813 }
4814
4815 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
4816 {
4817         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4818
4819         switch (event) {
4820         case NETDEV_REBOOT:
4821         case NETDEV_CHANGEMTU:
4822         case NETDEV_CHANGEADDR:
4823         case NETDEV_CHANGENAME:
4824         case NETDEV_FEAT_CHANGE:
4825         case NETDEV_BONDING_FAILOVER:
4826         case NETDEV_POST_TYPE_CHANGE:
4827         case NETDEV_NOTIFY_PEERS:
4828         case NETDEV_CHANGEUPPER:
4829         case NETDEV_RESEND_IGMP:
4830         case NETDEV_CHANGEINFODATA:
4831         case NETDEV_CHANGELOWERSTATE:
4832         case NETDEV_CHANGE_TX_QUEUE_LEN:
4833                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
4834                                    GFP_KERNEL, NULL, 0);
4835                 break;
4836         default:
4837                 break;
4838         }
4839         return NOTIFY_DONE;
4840 }
4841
4842 static struct notifier_block rtnetlink_dev_notifier = {
4843         .notifier_call  = rtnetlink_event,
4844 };
4845
4846
4847 static int __net_init rtnetlink_net_init(struct net *net)
4848 {
4849         struct sock *sk;
4850         struct netlink_kernel_cfg cfg = {
4851                 .groups         = RTNLGRP_MAX,
4852                 .input          = rtnetlink_rcv,
4853                 .cb_mutex       = &rtnl_mutex,
4854                 .flags          = NL_CFG_F_NONROOT_RECV,
4855                 .bind           = rtnetlink_bind,
4856         };
4857
4858         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
4859         if (!sk)
4860                 return -ENOMEM;
4861         net->rtnl = sk;
4862         return 0;
4863 }
4864
4865 static void __net_exit rtnetlink_net_exit(struct net *net)
4866 {
4867         netlink_kernel_release(net->rtnl);
4868         net->rtnl = NULL;
4869 }
4870
4871 static struct pernet_operations rtnetlink_net_ops = {
4872         .init = rtnetlink_net_init,
4873         .exit = rtnetlink_net_exit,
4874 };
4875
4876 void __init rtnetlink_init(void)
4877 {
4878         if (register_pernet_subsys(&rtnetlink_net_ops))
4879                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
4880
4881         register_netdevice_notifier(&rtnetlink_dev_notifier);
4882
4883         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
4884                       rtnl_dump_ifinfo, 0);
4885         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
4886         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
4887         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
4888
4889         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
4890         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
4891         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
4892
4893         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
4894         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
4895         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, 0);
4896
4897         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
4898         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
4899         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
4900
4901         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
4902                       0);
4903 }