net/core/rtnetlink.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4  *              operating system.  INET is implemented using the  BSD Socket
   5  *              interface as the means of communication with the user level.
   6  *
   7  *              Routing netlink socket interface: protocol independent part.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  *      Fixes:
  12  *      Vitaly E. Lavrov                RTA_OK arithmetic was wrong.
  13  */
  14
  15 #include <linux/bitops.h>
  16 #include <linux/errno.h>
  17 #include <linux/module.h>
  18 #include <linux/types.h>
  19 #include <linux/socket.h>
  20 #include <linux/kernel.h>
  21 #include <linux/timer.h>
  22 #include <linux/string.h>
  23 #include <linux/sockios.h>
  24 #include <linux/net.h>
  25 #include <linux/fcntl.h>
  26 #include <linux/mm.h>
  27 #include <linux/slab.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/capability.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/init.h>
  32 #include <linux/security.h>
  33 #include <linux/mutex.h>
  34 #include <linux/if_addr.h>
  35 #include <linux/if_bridge.h>
  36 #include <linux/if_vlan.h>
  37 #include <linux/pci.h>
  38 #include <linux/etherdevice.h>
  39 #include <linux/bpf.h>
  40
  41 #include <linux/uaccess.h>
  42
  43 #include <linux/inet.h>
  44 #include <linux/netdevice.h>
  45 #include <net/ip.h>
  46 #include <net/protocol.h>
  47 #include <net/arp.h>
  48 #include <net/route.h>
  49 #include <net/udp.h>
  50 #include <net/tcp.h>
  51 #include <net/sock.h>
  52 #include <net/pkt_sched.h>
  53 #include <net/fib_rules.h>
  54 #include <net/rtnetlink.h>
  55 #include <net/net_namespace.h>
  56 #include <net/devlink.h>
  57
  58 #include "dev.h"
  59
  60 #define RTNL_MAX_TYPE           50
  61 #define RTNL_SLAVE_MAX_TYPE     40
  62
  63 struct rtnl_link {
  64         rtnl_doit_func          doit;
  65         rtnl_dumpit_func        dumpit;
  66         struct module           *owner;
  67         unsigned int            flags;
  68         struct rcu_head         rcu;
  69 };
  70
  71 static DEFINE_MUTEX(rtnl_mutex);
  72
  73 void rtnl_lock(void)
  74 {
  75         mutex_lock(&rtnl_mutex);
  76 }
  77 EXPORT_SYMBOL(rtnl_lock);
  78
  79 int rtnl_lock_killable(void)
  80 {
  81         return mutex_lock_killable(&rtnl_mutex);
  82 }
  83 EXPORT_SYMBOL(rtnl_lock_killable);
  84
  85 static struct sk_buff *defer_kfree_skb_list;
  86 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
  87 {
  88         if (head && tail) {
  89                 tail->next = defer_kfree_skb_list;
  90                 defer_kfree_skb_list = head;
  91         }
  92 }
  93 EXPORT_SYMBOL(rtnl_kfree_skbs);
  94
  95 void __rtnl_unlock(void)
  96 {
  97         struct sk_buff *head = defer_kfree_skb_list;
  98
  99         defer_kfree_skb_list = NULL;
 100
 101         /* Ensure that we didn't actually add any TODO item when __rtnl_unlock()
 102          * is used. In some places, e.g. in cfg80211, we have code that will do
 103          * something like
 104          *   rtnl_lock()
 105          *   wiphy_lock()
 106          *   ...
 107          *   rtnl_unlock()
 108          *
 109          * and because netdev_run_todo() acquires the RTNL for items on the list
 110          * we could cause a situation such as this:
 111          * Thread 1                     Thread 2
 112          *                                rtnl_lock()
 113          *                                unregister_netdevice()
 114          *                                __rtnl_unlock()
 115          * rtnl_lock()
 116          * wiphy_lock()
 117          * rtnl_unlock()
 118          *   netdev_run_todo()
 119          *     __rtnl_unlock()
 120          *
 121          *     // list not empty now
 122          *     // because of thread 2
 123          *                                rtnl_lock()
 124          *     while (!list_empty(...))
 125          *       rtnl_lock()
 126          *                                wiphy_lock()
 127          * **** DEADLOCK ****
 128          *
 129          * However, usage of __rtnl_unlock() is rare, and so we can ensure that
 130          * it's not used in cases where something is added to do the list.
 131          */
 132         WARN_ON(!list_empty(&net_todo_list));
 133
 134         mutex_unlock(&rtnl_mutex);
 135
 136         while (head) {
 137                 struct sk_buff *next = head->next;
 138
 139                 kfree_skb(head);
 140                 cond_resched();
 141                 head = next;
 142         }
 143 }
 144
 145 void rtnl_unlock(void)
 146 {
 147         /* This fellow will unlock it for us. */
 148         netdev_run_todo();
 149 }
 150 EXPORT_SYMBOL(rtnl_unlock);
 151
 152 int rtnl_trylock(void)
 153 {
 154         return mutex_trylock(&rtnl_mutex);
 155 }
 156 EXPORT_SYMBOL(rtnl_trylock);
 157
 158 int rtnl_is_locked(void)
 159 {
 160         return mutex_is_locked(&rtnl_mutex);
 161 }
 162 EXPORT_SYMBOL(rtnl_is_locked);
 163
 164 bool refcount_dec_and_rtnl_lock(refcount_t *r)
 165 {
 166         return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
 167 }
 168 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
 169
 170 #ifdef CONFIG_PROVE_LOCKING
 171 bool lockdep_rtnl_is_held(void)
 172 {
 173         return lockdep_is_held(&rtnl_mutex);
 174 }
 175 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 176 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 177
 178 static struct rtnl_link __rcu *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 179
 180 static inline int rtm_msgindex(int msgtype)
 181 {
 182         int msgindex = msgtype - RTM_BASE;
 183
 184         /*
 185          * msgindex < 0 implies someone tried to register a netlink
 186          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 187          * the message type has not been added to linux/rtnetlink.h
 188          */
 189         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 190
 191         return msgindex;
 192 }
 193
 194 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
 195 {
 196         struct rtnl_link __rcu **tab;
 197
 198         if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
 199                 protocol = PF_UNSPEC;
 200
 201         tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
 202         if (!tab)
 203                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
 204
 205         return rcu_dereference_rtnl(tab[msgtype]);
 206 }
 207
 208 static int rtnl_register_internal(struct module *owner,
 209                                   int protocol, int msgtype,
 210                                   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 211                                   unsigned int flags)
 212 {
 213         struct rtnl_link *link, *old;
 214         struct rtnl_link __rcu **tab;
 215         int msgindex;
 216         int ret = -ENOBUFS;
 217
 218         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 219         msgindex = rtm_msgindex(msgtype);
 220
 221         rtnl_lock();
 222         tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
 223         if (tab == NULL) {
 224                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
 225                 if (!tab)
 226                         goto unlock;
 227
 228                 /* ensures we see the 0 stores */
 229                 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
 230         }
 231
 232         old = rtnl_dereference(tab[msgindex]);
 233         if (old) {
 234                 link = kmemdup(old, sizeof(*old), GFP_KERNEL);
 235                 if (!link)
 236                         goto unlock;
 237         } else {
 238                 link = kzalloc(sizeof(*link), GFP_KERNEL);
 239                 if (!link)
 240                         goto unlock;
 241         }
 242
 243         WARN_ON(link->owner && link->owner != owner);
 244         link->owner = owner;
 245
 246         WARN_ON(doit && link->doit && link->doit != doit);
 247         if (doit)
 248                 link->doit = doit;
 249         WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
 250         if (dumpit)
 251                 link->dumpit = dumpit;
 252
 253         WARN_ON(rtnl_msgtype_kind(msgtype) != RTNL_KIND_DEL &&
 254                 (flags & RTNL_FLAG_BULK_DEL_SUPPORTED));
 255         link->flags |= flags;
 256
 257         /* publish protocol:msgtype */
 258         rcu_assign_pointer(tab[msgindex], link);
 259         ret = 0;
 260         if (old)
 261                 kfree_rcu(old, rcu);
 262 unlock:
 263         rtnl_unlock();
 264         return ret;
 265 }
 266
 267 /**
 268  * rtnl_register_module - Register a rtnetlink message type
 269  *
 270  * @owner: module registering the hook (THIS_MODULE)
 271  * @protocol: Protocol family or PF_UNSPEC
 272  * @msgtype: rtnetlink message type
 273  * @doit: Function pointer called for each request message
 274  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 275  * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
 276  *
 277  * Like rtnl_register, but for use by removable modules.
 278  */
 279 int rtnl_register_module(struct module *owner,
 280                          int protocol, int msgtype,
 281                          rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 282                          unsigned int flags)
 283 {
 284         return rtnl_register_internal(owner, protocol, msgtype,
 285                                       doit, dumpit, flags);
 286 }
 287 EXPORT_SYMBOL_GPL(rtnl_register_module);
 288
 289 /**
 290  * rtnl_register - Register a rtnetlink message type
 291  * @protocol: Protocol family or PF_UNSPEC
 292  * @msgtype: rtnetlink message type
 293  * @doit: Function pointer called for each request message
 294  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 295  * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
 296  *
 297  * Registers the specified function pointers (at least one of them has
 298  * to be non-NULL) to be called whenever a request message for the
 299  * specified protocol family and message type is received.
 300  *
 301  * The special protocol family PF_UNSPEC may be used to define fallback
 302  * function pointers for the case when no entry for the specific protocol
 303  * family exists.
 304  */
 305 void rtnl_register(int protocol, int msgtype,
 306                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 307                    unsigned int flags)
 308 {
 309         int err;
 310
 311         err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
 312                                      flags);
 313         if (err)
 314                 pr_err("Unable to register rtnetlink message handler, "
 315                        "protocol = %d, message type = %d\n", protocol, msgtype);
 316 }
 317
 318 /**
 319  * rtnl_unregister - Unregister a rtnetlink message type
 320  * @protocol: Protocol family or PF_UNSPEC
 321  * @msgtype: rtnetlink message type
 322  *
 323  * Returns 0 on success or a negative error code.
 324  */
 325 int rtnl_unregister(int protocol, int msgtype)
 326 {
 327         struct rtnl_link __rcu **tab;
 328         struct rtnl_link *link;
 329         int msgindex;
 330
 331         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 332         msgindex = rtm_msgindex(msgtype);
 333
 334         rtnl_lock();
 335         tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
 336         if (!tab) {
 337                 rtnl_unlock();
 338                 return -ENOENT;
 339         }
 340
 341         link = rtnl_dereference(tab[msgindex]);
 342         RCU_INIT_POINTER(tab[msgindex], NULL);
 343         rtnl_unlock();
 344
 345         kfree_rcu(link, rcu);
 346
 347         return 0;
 348 }
 349 EXPORT_SYMBOL_GPL(rtnl_unregister);
 350
 351 /**
 352  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 353  * @protocol : Protocol family or PF_UNSPEC
 354  *
 355  * Identical to calling rtnl_unregster() for all registered message types
 356  * of a certain protocol family.
 357  */
 358 void rtnl_unregister_all(int protocol)
 359 {
 360         struct rtnl_link __rcu **tab;
 361         struct rtnl_link *link;
 362         int msgindex;
 363
 364         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 365
 366         rtnl_lock();
 367         tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
 368         if (!tab) {
 369                 rtnl_unlock();
 370                 return;
 371         }
 372         RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
 373         for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
 374                 link = rtnl_dereference(tab[msgindex]);
 375                 if (!link)
 376                         continue;
 377
 378                 RCU_INIT_POINTER(tab[msgindex], NULL);
 379                 kfree_rcu(link, rcu);
 380         }
 381         rtnl_unlock();
 382
 383         synchronize_net();
 384
 385         kfree(tab);
 386 }
 387 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 388
 389 static LIST_HEAD(link_ops);
 390
 391 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 392 {
 393         const struct rtnl_link_ops *ops;
 394
 395         list_for_each_entry(ops, &link_ops, list) {
 396                 if (!strcmp(ops->kind, kind))
 397                         return ops;
 398         }
 399         return NULL;
 400 }
 401
 402 /**
 403  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 404  * @ops: struct rtnl_link_ops * to register
 405  *
 406  * The caller must hold the rtnl_mutex. This function should be used
 407  * by drivers that create devices during module initialization. It
 408  * must be called before registering the devices.
 409  *
 410  * Returns 0 on success or a negative error code.
 411  */
 412 int __rtnl_link_register(struct rtnl_link_ops *ops)
 413 {
 414         if (rtnl_link_ops_get(ops->kind))
 415                 return -EEXIST;
 416
 417         /* The check for alloc/setup is here because if ops
 418          * does not have that filled up, it is not possible
 419          * to use the ops for creating device. So do not
 420          * fill up dellink as well. That disables rtnl_dellink.
 421          */
 422         if ((ops->alloc || ops->setup) && !ops->dellink)
 423                 ops->dellink = unregister_netdevice_queue;
 424
 425         list_add_tail(&ops->list, &link_ops);
 426         return 0;
 427 }
 428 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 429
 430 /**
 431  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 432  * @ops: struct rtnl_link_ops * to register
 433  *
 434  * Returns 0 on success or a negative error code.
 435  */
 436 int rtnl_link_register(struct rtnl_link_ops *ops)
 437 {
 438         int err;
 439
 440         /* Sanity-check max sizes to avoid stack buffer overflow. */
 441         if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
 442                     ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
 443                 return -EINVAL;
 444
 445         rtnl_lock();
 446         err = __rtnl_link_register(ops);
 447         rtnl_unlock();
 448         return err;
 449 }
 450 EXPORT_SYMBOL_GPL(rtnl_link_register);
 451
 452 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 453 {
 454         struct net_device *dev;
 455         LIST_HEAD(list_kill);
 456
 457         for_each_netdev(net, dev) {
 458                 if (dev->rtnl_link_ops == ops)
 459                         ops->dellink(dev, &list_kill);
 460         }
 461         unregister_netdevice_many(&list_kill);
 462 }
 463
 464 /**
 465  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 466  * @ops: struct rtnl_link_ops * to unregister
 467  *
 468  * The caller must hold the rtnl_mutex and guarantee net_namespace_list
 469  * integrity (hold pernet_ops_rwsem for writing to close the race
 470  * with setup_net() and cleanup_net()).
 471  */
 472 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 473 {
 474         struct net *net;
 475
 476         for_each_net(net) {
 477                 __rtnl_kill_links(net, ops);
 478         }
 479         list_del(&ops->list);
 480 }
 481 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 482
 483 /* Return with the rtnl_lock held when there are no network
 484  * devices unregistering in any network namespace.
 485  */
 486 static void rtnl_lock_unregistering_all(void)
 487 {
 488         struct net *net;
 489         bool unregistering;
 490         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 491
 492         add_wait_queue(&netdev_unregistering_wq, &wait);
 493         for (;;) {
 494                 unregistering = false;
 495                 rtnl_lock();
 496                 /* We held write locked pernet_ops_rwsem, and parallel
 497                  * setup_net() and cleanup_net() are not possible.
 498                  */
 499                 for_each_net(net) {
 500                         if (atomic_read(&net->dev_unreg_count) > 0) {
 501                                 unregistering = true;
 502                                 break;
 503                         }
 504                 }
 505                 if (!unregistering)
 506                         break;
 507                 __rtnl_unlock();
 508
 509                 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 510         }
 511         remove_wait_queue(&netdev_unregistering_wq, &wait);
 512 }
 513
 514 /**
 515  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 516  * @ops: struct rtnl_link_ops * to unregister
 517  */
 518 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 519 {
 520         /* Close the race with setup_net() and cleanup_net() */
 521         down_write(&pernet_ops_rwsem);
 522         rtnl_lock_unregistering_all();
 523         __rtnl_link_unregister(ops);
 524         rtnl_unlock();
 525         up_write(&pernet_ops_rwsem);
 526 }
 527 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 528
 529 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 530 {
 531         struct net_device *master_dev;
 532         const struct rtnl_link_ops *ops;
 533         size_t size = 0;
 534
 535         rcu_read_lock();
 536
 537         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 538         if (!master_dev)
 539                 goto out;
 540
 541         ops = master_dev->rtnl_link_ops;
 542         if (!ops || !ops->get_slave_size)
 543                 goto out;
 544         /* IFLA_INFO_SLAVE_DATA + nested data */
 545         size = nla_total_size(sizeof(struct nlattr)) +
 546                ops->get_slave_size(master_dev, dev);
 547
 548 out:
 549         rcu_read_unlock();
 550         return size;
 551 }
 552
 553 static size_t rtnl_link_get_size(const struct net_device *dev)
 554 {
 555         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 556         size_t size;
 557
 558         if (!ops)
 559                 return 0;
 560
 561         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 562                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 563
 564         if (ops->get_size)
 565                 /* IFLA_INFO_DATA + nested data */
 566                 size += nla_total_size(sizeof(struct nlattr)) +
 567                         ops->get_size(dev);
 568
 569         if (ops->get_xstats_size)
 570                 /* IFLA_INFO_XSTATS */
 571                 size += nla_total_size(ops->get_xstats_size(dev));
 572
 573         size += rtnl_link_get_slave_info_data_size(dev);
 574
 575         return size;
 576 }
 577
 578 static LIST_HEAD(rtnl_af_ops);
 579
 580 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 581 {
 582         const struct rtnl_af_ops *ops;
 583
 584         ASSERT_RTNL();
 585
 586         list_for_each_entry(ops, &rtnl_af_ops, list) {
 587                 if (ops->family == family)
 588                         return ops;
 589         }
 590
 591         return NULL;
 592 }
 593
 594 /**
 595  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 596  * @ops: struct rtnl_af_ops * to register
 597  *
 598  * Returns 0 on success or a negative error code.
 599  */
 600 void rtnl_af_register(struct rtnl_af_ops *ops)
 601 {
 602         rtnl_lock();
 603         list_add_tail_rcu(&ops->list, &rtnl_af_ops);
 604         rtnl_unlock();
 605 }
 606 EXPORT_SYMBOL_GPL(rtnl_af_register);
 607
 608 /**
 609  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 610  * @ops: struct rtnl_af_ops * to unregister
 611  */
 612 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 613 {
 614         rtnl_lock();
 615         list_del_rcu(&ops->list);
 616         rtnl_unlock();
 617
 618         synchronize_rcu();
 619 }
 620 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 621
 622 static size_t rtnl_link_get_af_size(const struct net_device *dev,
 623                                     u32 ext_filter_mask)
 624 {
 625         struct rtnl_af_ops *af_ops;
 626         size_t size;
 627
 628         /* IFLA_AF_SPEC */
 629         size = nla_total_size(sizeof(struct nlattr));
 630
 631         rcu_read_lock();
 632         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
 633                 if (af_ops->get_link_af_size) {
 634                         /* AF_* + nested data */
 635                         size += nla_total_size(sizeof(struct nlattr)) +
 636                                 af_ops->get_link_af_size(dev, ext_filter_mask);
 637                 }
 638         }
 639         rcu_read_unlock();
 640
 641         return size;
 642 }
 643
 644 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 645 {
 646         struct net_device *master_dev;
 647         bool ret = false;
 648
 649         rcu_read_lock();
 650
 651         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 652         if (master_dev && master_dev->rtnl_link_ops)
 653                 ret = true;
 654         rcu_read_unlock();
 655         return ret;
 656 }
 657
 658 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 659                                      const struct net_device *dev)
 660 {
 661         struct net_device *master_dev;
 662         const struct rtnl_link_ops *ops;
 663         struct nlattr *slave_data;
 664         int err;
 665
 666         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 667         if (!master_dev)
 668                 return 0;
 669         ops = master_dev->rtnl_link_ops;
 670         if (!ops)
 671                 return 0;
 672         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 673                 return -EMSGSIZE;
 674         if (ops->fill_slave_info) {
 675                 slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA);
 676                 if (!slave_data)
 677                         return -EMSGSIZE;
 678                 err = ops->fill_slave_info(skb, master_dev, dev);
 679                 if (err < 0)
 680                         goto err_cancel_slave_data;
 681                 nla_nest_end(skb, slave_data);
 682         }
 683         return 0;
 684
 685 err_cancel_slave_data:
 686         nla_nest_cancel(skb, slave_data);
 687         return err;
 688 }
 689
 690 static int rtnl_link_info_fill(struct sk_buff *skb,
 691                                const struct net_device *dev)
 692 {
 693         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 694         struct nlattr *data;
 695         int err;
 696
 697         if (!ops)
 698                 return 0;
 699         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 700                 return -EMSGSIZE;
 701         if (ops->fill_xstats) {
 702                 err = ops->fill_xstats(skb, dev);
 703                 if (err < 0)
 704                         return err;
 705         }
 706         if (ops->fill_info) {
 707                 data = nla_nest_start_noflag(skb, IFLA_INFO_DATA);
 708                 if (data == NULL)
 709                         return -EMSGSIZE;
 710                 err = ops->fill_info(skb, dev);
 711                 if (err < 0)
 712                         goto err_cancel_data;
 713                 nla_nest_end(skb, data);
 714         }
 715         return 0;
 716
 717 err_cancel_data:
 718         nla_nest_cancel(skb, data);
 719         return err;
 720 }
 721
 722 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 723 {
 724         struct nlattr *linkinfo;
 725         int err = -EMSGSIZE;
 726
 727         linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO);
 728         if (linkinfo == NULL)
 729                 goto out;
 730
 731         err = rtnl_link_info_fill(skb, dev);
 732         if (err < 0)
 733                 goto err_cancel_link;
 734
 735         err = rtnl_link_slave_info_fill(skb, dev);
 736         if (err < 0)
 737                 goto err_cancel_link;
 738
 739         nla_nest_end(skb, linkinfo);
 740         return 0;
 741
 742 err_cancel_link:
 743         nla_nest_cancel(skb, linkinfo);
 744 out:
 745         return err;
 746 }
 747
 748 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 749 {
 750         struct sock *rtnl = net->rtnl;
 751
 752         return nlmsg_notify(rtnl, skb, pid, group, echo, GFP_KERNEL);
 753 }
 754
 755 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 756 {
 757         struct sock *rtnl = net->rtnl;
 758
 759         return nlmsg_unicast(rtnl, skb, pid);
 760 }
 761 EXPORT_SYMBOL(rtnl_unicast);
 762
 763 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 764                  const struct nlmsghdr *nlh, gfp_t flags)
 765 {
 766         struct sock *rtnl = net->rtnl;
 767
 768         nlmsg_notify(rtnl, skb, pid, group, nlmsg_report(nlh), flags);
 769 }
 770 EXPORT_SYMBOL(rtnl_notify);
 771
 772 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 773 {
 774         struct sock *rtnl = net->rtnl;
 775
 776         netlink_set_err(rtnl, 0, group, error);
 777 }
 778 EXPORT_SYMBOL(rtnl_set_sk_err);
 779
 780 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 781 {
 782         struct nlattr *mx;
 783         int i, valid = 0;
 784
 785         /* nothing is dumped for dst_default_metrics, so just skip the loop */
 786         if (metrics == dst_default_metrics.metrics)
 787                 return 0;
 788
 789         mx = nla_nest_start_noflag(skb, RTA_METRICS);
 790         if (mx == NULL)
 791                 return -ENOBUFS;
 792
 793         for (i = 0; i < RTAX_MAX; i++) {
 794                 if (metrics[i]) {
 795                         if (i == RTAX_CC_ALGO - 1) {
 796                                 char tmp[TCP_CA_NAME_MAX], *name;
 797
 798                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 799                                 if (!name)
 800                                         continue;
 801                                 if (nla_put_string(skb, i + 1, name))
 802                                         goto nla_put_failure;
 803                         } else if (i == RTAX_FEATURES - 1) {
 804                                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 805
 806                                 if (!user_features)
 807                                         continue;
 808                                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 809                                 if (nla_put_u32(skb, i + 1, user_features))
 810                                         goto nla_put_failure;
 811                         } else {
 812                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 813                                         goto nla_put_failure;
 814                         }
 815                         valid++;
 816                 }
 817         }
 818
 819         if (!valid) {
 820                 nla_nest_cancel(skb, mx);
 821                 return 0;
 822         }
 823
 824         return nla_nest_end(skb, mx);
 825
 826 nla_put_failure:
 827         nla_nest_cancel(skb, mx);
 828         return -EMSGSIZE;
 829 }
 830 EXPORT_SYMBOL(rtnetlink_put_metrics);
 831
 832 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 833                        long expires, u32 error)
 834 {
 835         struct rta_cacheinfo ci = {
 836                 .rta_error = error,
 837                 .rta_id =  id,
 838         };
 839
 840         if (dst) {
 841                 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
 842                 ci.rta_used = dst->__use;
 843                 ci.rta_clntref = atomic_read(&dst->__refcnt);
 844         }
 845         if (expires) {
 846                 unsigned long clock;
 847
 848                 clock = jiffies_to_clock_t(abs(expires));
 849                 clock = min_t(unsigned long, clock, INT_MAX);
 850                 ci.rta_expires = (expires > 0) ? clock : -clock;
 851         }
 852         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 853 }
 854 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 855
 856 static void set_operstate(struct net_device *dev, unsigned char transition)
 857 {
 858         unsigned char operstate = dev->operstate;
 859
 860         switch (transition) {
 861         case IF_OPER_UP:
 862                 if ((operstate == IF_OPER_DORMANT ||
 863                      operstate == IF_OPER_TESTING ||
 864                      operstate == IF_OPER_UNKNOWN) &&
 865                     !netif_dormant(dev) && !netif_testing(dev))
 866                         operstate = IF_OPER_UP;
 867                 break;
 868
 869         case IF_OPER_TESTING:
 870                 if (netif_oper_up(dev))
 871                         operstate = IF_OPER_TESTING;
 872                 break;
 873
 874         case IF_OPER_DORMANT:
 875                 if (netif_oper_up(dev))
 876                         operstate = IF_OPER_DORMANT;
 877                 break;
 878         }
 879
 880         if (dev->operstate != operstate) {
 881                 write_lock(&dev_base_lock);
 882                 dev->operstate = operstate;
 883                 write_unlock(&dev_base_lock);
 884                 netdev_state_change(dev);
 885         }
 886 }
 887
 888 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 889 {
 890         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 891                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 892 }
 893
 894 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 895                                            const struct ifinfomsg *ifm)
 896 {
 897         unsigned int flags = ifm->ifi_flags;
 898
 899         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 900         if (ifm->ifi_change)
 901                 flags = (flags & ifm->ifi_change) |
 902                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 903
 904         return flags;
 905 }
 906
 907 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 908                                  const struct rtnl_link_stats64 *b)
 909 {
 910         a->rx_packets = b->rx_packets;
 911         a->tx_packets = b->tx_packets;
 912         a->rx_bytes = b->rx_bytes;
 913         a->tx_bytes = b->tx_bytes;
 914         a->rx_errors = b->rx_errors;
 915         a->tx_errors = b->tx_errors;
 916         a->rx_dropped = b->rx_dropped;
 917         a->tx_dropped = b->tx_dropped;
 918
 919         a->multicast = b->multicast;
 920         a->collisions = b->collisions;
 921
 922         a->rx_length_errors = b->rx_length_errors;
 923         a->rx_over_errors = b->rx_over_errors;
 924         a->rx_crc_errors = b->rx_crc_errors;
 925         a->rx_frame_errors = b->rx_frame_errors;
 926         a->rx_fifo_errors = b->rx_fifo_errors;
 927         a->rx_missed_errors = b->rx_missed_errors;
 928
 929         a->tx_aborted_errors = b->tx_aborted_errors;
 930         a->tx_carrier_errors = b->tx_carrier_errors;
 931         a->tx_fifo_errors = b->tx_fifo_errors;
 932         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 933         a->tx_window_errors = b->tx_window_errors;
 934
 935         a->rx_compressed = b->rx_compressed;
 936         a->tx_compressed = b->tx_compressed;
 937
 938         a->rx_nohandler = b->rx_nohandler;
 939 }
 940
 941 /* All VF info */
 942 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 943                                    u32 ext_filter_mask)
 944 {
 945         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
 946                 int num_vfs = dev_num_vf(dev->dev.parent);
 947                 size_t size = nla_total_size(0);
 948                 size += num_vfs *
 949                         (nla_total_size(0) +
 950                          nla_total_size(sizeof(struct ifla_vf_mac)) +
 951                          nla_total_size(sizeof(struct ifla_vf_broadcast)) +
 952                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 953                          nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
 954                          nla_total_size(MAX_VLAN_LIST_LEN *
 955                                         sizeof(struct ifla_vf_vlan_info)) +
 956                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 957                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 958                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 959                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 960                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 961                          nla_total_size(0) + /* nest IFLA_VF_STATS */
 962                          /* IFLA_VF_STATS_RX_PACKETS */
 963                          nla_total_size_64bit(sizeof(__u64)) +
 964                          /* IFLA_VF_STATS_TX_PACKETS */
 965                          nla_total_size_64bit(sizeof(__u64)) +
 966                          /* IFLA_VF_STATS_RX_BYTES */
 967                          nla_total_size_64bit(sizeof(__u64)) +
 968                          /* IFLA_VF_STATS_TX_BYTES */
 969                          nla_total_size_64bit(sizeof(__u64)) +
 970                          /* IFLA_VF_STATS_BROADCAST */
 971                          nla_total_size_64bit(sizeof(__u64)) +
 972                          /* IFLA_VF_STATS_MULTICAST */
 973                          nla_total_size_64bit(sizeof(__u64)) +
 974                          /* IFLA_VF_STATS_RX_DROPPED */
 975                          nla_total_size_64bit(sizeof(__u64)) +
 976                          /* IFLA_VF_STATS_TX_DROPPED */
 977                          nla_total_size_64bit(sizeof(__u64)) +
 978                          nla_total_size(sizeof(struct ifla_vf_trust)));
 979                 return size;
 980         } else
 981                 return 0;
 982 }
 983
 984 static size_t rtnl_port_size(const struct net_device *dev,
 985                              u32 ext_filter_mask)
 986 {
 987         size_t port_size = nla_total_size(4)            /* PORT_VF */
 988                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 989                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 990                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 991                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 992                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 993         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 994         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 995                 + port_size;
 996         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 997                 + port_size;
 998
 999         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1000             !(ext_filter_mask & RTEXT_FILTER_VF))
1001                 return 0;
1002         if (dev_num_vf(dev->dev.parent))
1003                 return port_self_size + vf_ports_size +
1004                         vf_port_size * dev_num_vf(dev->dev.parent);
1005         else
1006                 return port_self_size;
1007 }
1008
1009 static size_t rtnl_xdp_size(void)
1010 {
1011         size_t xdp_size = nla_total_size(0) +   /* nest IFLA_XDP */
1012                           nla_total_size(1) +   /* XDP_ATTACHED */
1013                           nla_total_size(4) +   /* XDP_PROG_ID (or 1st mode) */
1014                           nla_total_size(4);    /* XDP_<mode>_PROG_ID */
1015
1016         return xdp_size;
1017 }
1018
1019 static size_t rtnl_prop_list_size(const struct net_device *dev)
1020 {
1021         struct netdev_name_node *name_node;
1022         size_t size;
1023
1024         if (list_empty(&dev->name_node->list))
1025                 return 0;
1026         size = nla_total_size(0);
1027         list_for_each_entry(name_node, &dev->name_node->list, list)
1028                 size += nla_total_size(ALTIFNAMSIZ);
1029         return size;
1030 }
1031
1032 static size_t rtnl_proto_down_size(const struct net_device *dev)
1033 {
1034         size_t size = nla_total_size(1);
1035
1036         if (dev->proto_down_reason)
1037                 size += nla_total_size(0) + nla_total_size(4);
1038
1039         return size;
1040 }
1041
1042 static size_t rtnl_devlink_port_size(const struct net_device *dev)
1043 {
1044         size_t size = nla_total_size(0); /* nest IFLA_DEVLINK_PORT */
1045
1046         if (dev->devlink_port)
1047                 size += devlink_nl_port_handle_size(dev->devlink_port);
1048
1049         return size;
1050 }
1051
1052 static noinline size_t if_nlmsg_size(const struct net_device *dev,
1053                                      u32 ext_filter_mask)
1054 {
1055         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
1056                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
1057                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
1058                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
1059                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
1060                + nla_total_size(sizeof(struct rtnl_link_stats))
1061                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
1062                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
1063                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
1064                + nla_total_size(4) /* IFLA_TXQLEN */
1065                + nla_total_size(4) /* IFLA_WEIGHT */
1066                + nla_total_size(4) /* IFLA_MTU */
1067                + nla_total_size(4) /* IFLA_LINK */
1068                + nla_total_size(4) /* IFLA_MASTER */
1069                + nla_total_size(1) /* IFLA_CARRIER */
1070                + nla_total_size(4) /* IFLA_PROMISCUITY */
1071                + nla_total_size(4) /* IFLA_ALLMULTI */
1072                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1073                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1074                + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1075                + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1076                + nla_total_size(4) /* IFLA_GRO_MAX_SIZE */
1077                + nla_total_size(4) /* IFLA_TSO_MAX_SIZE */
1078                + nla_total_size(4) /* IFLA_TSO_MAX_SEGS */
1079                + nla_total_size(1) /* IFLA_OPERSTATE */
1080                + nla_total_size(1) /* IFLA_LINKMODE */
1081                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1082                + nla_total_size(4) /* IFLA_LINK_NETNSID */
1083                + nla_total_size(4) /* IFLA_GROUP */
1084                + nla_total_size(ext_filter_mask
1085                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1086                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1087                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1088                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1089                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1090                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1091                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1092                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1093                + rtnl_xdp_size() /* IFLA_XDP */
1094                + nla_total_size(4)  /* IFLA_EVENT */
1095                + nla_total_size(4)  /* IFLA_NEW_NETNSID */
1096                + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
1097                + rtnl_proto_down_size(dev)  /* proto down */
1098                + nla_total_size(4)  /* IFLA_TARGET_NETNSID */
1099                + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
1100                + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
1101                + nla_total_size(4)  /* IFLA_MIN_MTU */
1102                + nla_total_size(4)  /* IFLA_MAX_MTU */
1103                + rtnl_prop_list_size(dev)
1104                + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
1105                + rtnl_devlink_port_size(dev)
1106                + 0;
1107 }
1108
1109 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1110 {
1111         struct nlattr *vf_ports;
1112         struct nlattr *vf_port;
1113         int vf;
1114         int err;
1115
1116         vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
1117         if (!vf_ports)
1118                 return -EMSGSIZE;
1119
1120         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1121                 vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
1122                 if (!vf_port)
1123                         goto nla_put_failure;
1124                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1125                         goto nla_put_failure;
1126                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1127                 if (err == -EMSGSIZE)
1128                         goto nla_put_failure;
1129                 if (err) {
1130                         nla_nest_cancel(skb, vf_port);
1131                         continue;
1132                 }
1133                 nla_nest_end(skb, vf_port);
1134         }
1135
1136         nla_nest_end(skb, vf_ports);
1137
1138         return 0;
1139
1140 nla_put_failure:
1141         nla_nest_cancel(skb, vf_ports);
1142         return -EMSGSIZE;
1143 }
1144
1145 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1146 {
1147         struct nlattr *port_self;
1148         int err;
1149
1150         port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
1151         if (!port_self)
1152                 return -EMSGSIZE;
1153
1154         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1155         if (err) {
1156                 nla_nest_cancel(skb, port_self);
1157                 return (err == -EMSGSIZE) ? err : 0;
1158         }
1159
1160         nla_nest_end(skb, port_self);
1161
1162         return 0;
1163 }
1164
1165 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1166                           u32 ext_filter_mask)
1167 {
1168         int err;
1169
1170         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1171             !(ext_filter_mask & RTEXT_FILTER_VF))
1172                 return 0;
1173
1174         err = rtnl_port_self_fill(skb, dev);
1175         if (err)
1176                 return err;
1177
1178         if (dev_num_vf(dev->dev.parent)) {
1179                 err = rtnl_vf_ports_fill(skb, dev);
1180                 if (err)
1181                         return err;
1182         }
1183
1184         return 0;
1185 }
1186
1187 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1188 {
1189         int err;
1190         struct netdev_phys_item_id ppid;
1191
1192         err = dev_get_phys_port_id(dev, &ppid);
1193         if (err) {
1194                 if (err == -EOPNOTSUPP)
1195                         return 0;
1196                 return err;
1197         }
1198
1199         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1200                 return -EMSGSIZE;
1201
1202         return 0;
1203 }
1204
1205 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1206 {
1207         char name[IFNAMSIZ];
1208         int err;
1209
1210         err = dev_get_phys_port_name(dev, name, sizeof(name));
1211         if (err) {
1212                 if (err == -EOPNOTSUPP)
1213                         return 0;
1214                 return err;
1215         }
1216
1217         if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1218                 return -EMSGSIZE;
1219
1220         return 0;
1221 }
1222
1223 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1224 {
1225         struct netdev_phys_item_id ppid = { };
1226         int err;
1227
1228         err = dev_get_port_parent_id(dev, &ppid, false);
1229         if (err) {
1230                 if (err == -EOPNOTSUPP)
1231                         return 0;
1232                 return err;
1233         }
1234
1235         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
1236                 return -EMSGSIZE;
1237
1238         return 0;
1239 }
1240
1241 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1242                                               struct net_device *dev)
1243 {
1244         struct rtnl_link_stats64 *sp;
1245         struct nlattr *attr;
1246
1247         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1248                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1249         if (!attr)
1250                 return -EMSGSIZE;
1251
1252         sp = nla_data(attr);
1253         dev_get_stats(dev, sp);
1254
1255         attr = nla_reserve(skb, IFLA_STATS,
1256                            sizeof(struct rtnl_link_stats));
1257         if (!attr)
1258                 return -EMSGSIZE;
1259
1260         copy_rtnl_link_stats(nla_data(attr), sp);
1261
1262         return 0;
1263 }
1264
1265 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1266                                                struct net_device *dev,
1267                                                int vfs_num,
1268                                                struct nlattr *vfinfo)
1269 {
1270         struct ifla_vf_rss_query_en vf_rss_query_en;
1271         struct nlattr *vf, *vfstats, *vfvlanlist;
1272         struct ifla_vf_link_state vf_linkstate;
1273         struct ifla_vf_vlan_info vf_vlan_info;
1274         struct ifla_vf_spoofchk vf_spoofchk;
1275         struct ifla_vf_tx_rate vf_tx_rate;
1276         struct ifla_vf_stats vf_stats;
1277         struct ifla_vf_trust vf_trust;
1278         struct ifla_vf_vlan vf_vlan;
1279         struct ifla_vf_rate vf_rate;
1280         struct ifla_vf_mac vf_mac;
1281         struct ifla_vf_broadcast vf_broadcast;
1282         struct ifla_vf_info ivi;
1283         struct ifla_vf_guid node_guid;
1284         struct ifla_vf_guid port_guid;
1285
1286         memset(&ivi, 0, sizeof(ivi));
1287
1288         /* Not all SR-IOV capable drivers support the
1289          * spoofcheck and "RSS query enable" query.  Preset to
1290          * -1 so the user space tool can detect that the driver
1291          * didn't report anything.
1292          */
1293         ivi.spoofchk = -1;
1294         ivi.rss_query_en = -1;
1295         ivi.trusted = -1;
1296         /* The default value for VF link state is "auto"
1297          * IFLA_VF_LINK_STATE_AUTO which equals zero
1298          */
1299         ivi.linkstate = 0;
1300         /* VLAN Protocol by default is 802.1Q */
1301         ivi.vlan_proto = htons(ETH_P_8021Q);
1302         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1303                 return 0;
1304
1305         memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1306         memset(&node_guid, 0, sizeof(node_guid));
1307         memset(&port_guid, 0, sizeof(port_guid));
1308
1309         vf_mac.vf =
1310                 vf_vlan.vf =
1311                 vf_vlan_info.vf =
1312                 vf_rate.vf =
1313                 vf_tx_rate.vf =
1314                 vf_spoofchk.vf =
1315                 vf_linkstate.vf =
1316                 vf_rss_query_en.vf =
1317                 vf_trust.vf =
1318                 node_guid.vf =
1319                 port_guid.vf = ivi.vf;
1320
1321         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1322         memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
1323         vf_vlan.vlan = ivi.vlan;
1324         vf_vlan.qos = ivi.qos;
1325         vf_vlan_info.vlan = ivi.vlan;
1326         vf_vlan_info.qos = ivi.qos;
1327         vf_vlan_info.vlan_proto = ivi.vlan_proto;
1328         vf_tx_rate.rate = ivi.max_tx_rate;
1329         vf_rate.min_tx_rate = ivi.min_tx_rate;
1330         vf_rate.max_tx_rate = ivi.max_tx_rate;
1331         vf_spoofchk.setting = ivi.spoofchk;
1332         vf_linkstate.link_state = ivi.linkstate;
1333         vf_rss_query_en.setting = ivi.rss_query_en;
1334         vf_trust.setting = ivi.trusted;
1335         vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1336         if (!vf)
1337                 goto nla_put_vfinfo_failure;
1338         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1339             nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
1340             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1341             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1342                     &vf_rate) ||
1343             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1344                     &vf_tx_rate) ||
1345             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1346                     &vf_spoofchk) ||
1347             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1348                     &vf_linkstate) ||
1349             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1350                     sizeof(vf_rss_query_en),
1351                     &vf_rss_query_en) ||
1352             nla_put(skb, IFLA_VF_TRUST,
1353                     sizeof(vf_trust), &vf_trust))
1354                 goto nla_put_vf_failure;
1355
1356         if (dev->netdev_ops->ndo_get_vf_guid &&
1357             !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
1358                                               &port_guid)) {
1359                 if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
1360                             &node_guid) ||
1361                     nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
1362                             &port_guid))
1363                         goto nla_put_vf_failure;
1364         }
1365         vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1366         if (!vfvlanlist)
1367                 goto nla_put_vf_failure;
1368         if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1369                     &vf_vlan_info)) {
1370                 nla_nest_cancel(skb, vfvlanlist);
1371                 goto nla_put_vf_failure;
1372         }
1373         nla_nest_end(skb, vfvlanlist);
1374         memset(&vf_stats, 0, sizeof(vf_stats));
1375         if (dev->netdev_ops->ndo_get_vf_stats)
1376                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1377                                                 &vf_stats);
1378         vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1379         if (!vfstats)
1380                 goto nla_put_vf_failure;
1381         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1382                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1383             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1384                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1385             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1386                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1387             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1388                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1389             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1390                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1391             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1392                               vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1393             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1394                               vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1395             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1396                               vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1397                 nla_nest_cancel(skb, vfstats);
1398                 goto nla_put_vf_failure;
1399         }
1400         nla_nest_end(skb, vfstats);
1401         nla_nest_end(skb, vf);
1402         return 0;
1403
1404 nla_put_vf_failure:
1405         nla_nest_cancel(skb, vf);
1406 nla_put_vfinfo_failure:
1407         nla_nest_cancel(skb, vfinfo);
1408         return -EMSGSIZE;
1409 }
1410
1411 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1412                                            struct net_device *dev,
1413                                            u32 ext_filter_mask)
1414 {
1415         struct nlattr *vfinfo;
1416         int i, num_vfs;
1417
1418         if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1419                 return 0;
1420
1421         num_vfs = dev_num_vf(dev->dev.parent);
1422         if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1423                 return -EMSGSIZE;
1424
1425         if (!dev->netdev_ops->ndo_get_vf_config)
1426                 return 0;
1427
1428         vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1429         if (!vfinfo)
1430                 return -EMSGSIZE;
1431
1432         for (i = 0; i < num_vfs; i++) {
1433                 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1434                         return -EMSGSIZE;
1435         }
1436
1437         nla_nest_end(skb, vfinfo);
1438         return 0;
1439 }
1440
1441 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1442 {
1443         struct rtnl_link_ifmap map;
1444
1445         memset(&map, 0, sizeof(map));
1446         map.mem_start   = dev->mem_start;
1447         map.mem_end     = dev->mem_end;
1448         map.base_addr   = dev->base_addr;
1449         map.irq         = dev->irq;
1450         map.dma         = dev->dma;
1451         map.port        = dev->if_port;
1452
1453         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1454                 return -EMSGSIZE;
1455
1456         return 0;
1457 }
1458
1459 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1460 {
1461         const struct bpf_prog *generic_xdp_prog;
1462
1463         ASSERT_RTNL();
1464
1465         generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1466         if (!generic_xdp_prog)
1467                 return 0;
1468         return generic_xdp_prog->aux->id;
1469 }
1470
1471 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1472 {
1473         return dev_xdp_prog_id(dev, XDP_MODE_DRV);
1474 }
1475
1476 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1477 {
1478         return dev_xdp_prog_id(dev, XDP_MODE_HW);
1479 }
1480
1481 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1482                                u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1483                                u32 (*get_prog_id)(struct net_device *dev))
1484 {
1485         u32 curr_id;
1486         int err;
1487
1488         curr_id = get_prog_id(dev);
1489         if (!curr_id)
1490                 return 0;
1491
1492         *prog_id = curr_id;
1493         err = nla_put_u32(skb, attr, curr_id);
1494         if (err)
1495                 return err;
1496
1497         if (*mode != XDP_ATTACHED_NONE)
1498                 *mode = XDP_ATTACHED_MULTI;
1499         else
1500                 *mode = tgt_mode;
1501
1502         return 0;
1503 }
1504
1505 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1506 {
1507         struct nlattr *xdp;
1508         u32 prog_id;
1509         int err;
1510         u8 mode;
1511
1512         xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1513         if (!xdp)
1514                 return -EMSGSIZE;
1515
1516         prog_id = 0;
1517         mode = XDP_ATTACHED_NONE;
1518         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1519                                   IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1520         if (err)
1521                 goto err_cancel;
1522         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1523                                   IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1524         if (err)
1525                 goto err_cancel;
1526         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1527                                   IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1528         if (err)
1529                 goto err_cancel;
1530
1531         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1532         if (err)
1533                 goto err_cancel;
1534
1535         if (prog_id && mode != XDP_ATTACHED_MULTI) {
1536                 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1537                 if (err)
1538                         goto err_cancel;
1539         }
1540
1541         nla_nest_end(skb, xdp);
1542         return 0;
1543
1544 err_cancel:
1545         nla_nest_cancel(skb, xdp);
1546         return err;
1547 }
1548
1549 static u32 rtnl_get_event(unsigned long event)
1550 {
1551         u32 rtnl_event_type = IFLA_EVENT_NONE;
1552
1553         switch (event) {
1554         case NETDEV_REBOOT:
1555                 rtnl_event_type = IFLA_EVENT_REBOOT;
1556                 break;
1557         case NETDEV_FEAT_CHANGE:
1558                 rtnl_event_type = IFLA_EVENT_FEATURES;
1559                 break;
1560         case NETDEV_BONDING_FAILOVER:
1561                 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1562                 break;
1563         case NETDEV_NOTIFY_PEERS:
1564                 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1565                 break;
1566         case NETDEV_RESEND_IGMP:
1567                 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1568                 break;
1569         case NETDEV_CHANGEINFODATA:
1570                 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1571                 break;
1572         default:
1573                 break;
1574         }
1575
1576         return rtnl_event_type;
1577 }
1578
1579 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1580 {
1581         const struct net_device *upper_dev;
1582         int ret = 0;
1583
1584         rcu_read_lock();
1585
1586         upper_dev = netdev_master_upper_dev_get_rcu(dev);
1587         if (upper_dev)
1588                 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1589
1590         rcu_read_unlock();
1591         return ret;
1592 }
1593
1594 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1595                           bool force)
1596 {
1597         int ifindex = dev_get_iflink(dev);
1598
1599         if (force || dev->ifindex != ifindex)
1600                 return nla_put_u32(skb, IFLA_LINK, ifindex);
1601
1602         return 0;
1603 }
1604
1605 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1606                                               struct net_device *dev)
1607 {
1608         char buf[IFALIASZ];
1609         int ret;
1610
1611         ret = dev_get_alias(dev, buf, sizeof(buf));
1612         return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1613 }
1614
1615 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1616                                   const struct net_device *dev,
1617                                   struct net *src_net, gfp_t gfp)
1618 {
1619         bool put_iflink = false;
1620
1621         if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1622                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1623
1624                 if (!net_eq(dev_net(dev), link_net)) {
1625                         int id = peernet2id_alloc(src_net, link_net, gfp);
1626
1627                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1628                                 return -EMSGSIZE;
1629
1630                         put_iflink = true;
1631                 }
1632         }
1633
1634         return nla_put_iflink(skb, dev, put_iflink);
1635 }
1636
1637 static int rtnl_fill_link_af(struct sk_buff *skb,
1638                              const struct net_device *dev,
1639                              u32 ext_filter_mask)
1640 {
1641         const struct rtnl_af_ops *af_ops;
1642         struct nlattr *af_spec;
1643
1644         af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1645         if (!af_spec)
1646                 return -EMSGSIZE;
1647
1648         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1649                 struct nlattr *af;
1650                 int err;
1651
1652                 if (!af_ops->fill_link_af)
1653                         continue;
1654
1655                 af = nla_nest_start_noflag(skb, af_ops->family);
1656                 if (!af)
1657                         return -EMSGSIZE;
1658
1659                 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1660                 /*
1661                  * Caller may return ENODATA to indicate that there
1662                  * was no data to be dumped. This is not an error, it
1663                  * means we should trim the attribute header and
1664                  * continue.
1665                  */
1666                 if (err == -ENODATA)
1667                         nla_nest_cancel(skb, af);
1668                 else if (err < 0)
1669                         return -EMSGSIZE;
1670
1671                 nla_nest_end(skb, af);
1672         }
1673
1674         nla_nest_end(skb, af_spec);
1675         return 0;
1676 }
1677
1678 static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
1679                                  const struct net_device *dev)
1680 {
1681         struct netdev_name_node *name_node;
1682         int count = 0;
1683
1684         list_for_each_entry(name_node, &dev->name_node->list, list) {
1685                 if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
1686                         return -EMSGSIZE;
1687                 count++;
1688         }
1689         return count;
1690 }
1691
1692 static int rtnl_fill_prop_list(struct sk_buff *skb,
1693                                const struct net_device *dev)
1694 {
1695         struct nlattr *prop_list;
1696         int ret;
1697
1698         prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
1699         if (!prop_list)
1700                 return -EMSGSIZE;
1701
1702         ret = rtnl_fill_alt_ifnames(skb, dev);
1703         if (ret <= 0)
1704                 goto nest_cancel;
1705
1706         nla_nest_end(skb, prop_list);
1707         return 0;
1708
1709 nest_cancel:
1710         nla_nest_cancel(skb, prop_list);
1711         return ret;
1712 }
1713
1714 static int rtnl_fill_proto_down(struct sk_buff *skb,
1715                                 const struct net_device *dev)
1716 {
1717         struct nlattr *pr;
1718         u32 preason;
1719
1720         if (nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1721                 goto nla_put_failure;
1722
1723         preason = dev->proto_down_reason;
1724         if (!preason)
1725                 return 0;
1726
1727         pr = nla_nest_start(skb, IFLA_PROTO_DOWN_REASON);
1728         if (!pr)
1729                 return -EMSGSIZE;
1730
1731         if (nla_put_u32(skb, IFLA_PROTO_DOWN_REASON_VALUE, preason)) {
1732                 nla_nest_cancel(skb, pr);
1733                 goto nla_put_failure;
1734         }
1735
1736         nla_nest_end(skb, pr);
1737         return 0;
1738
1739 nla_put_failure:
1740         return -EMSGSIZE;
1741 }
1742
1743 static int rtnl_fill_devlink_port(struct sk_buff *skb,
1744                                   const struct net_device *dev)
1745 {
1746         struct nlattr *devlink_port_nest;
1747         int ret;
1748
1749         devlink_port_nest = nla_nest_start(skb, IFLA_DEVLINK_PORT);
1750         if (!devlink_port_nest)
1751                 return -EMSGSIZE;
1752
1753         if (dev->devlink_port) {
1754                 ret = devlink_nl_port_handle_fill(skb, dev->devlink_port);
1755                 if (ret < 0)
1756                         goto nest_cancel;
1757         }
1758
1759         nla_nest_end(skb, devlink_port_nest);
1760         return 0;
1761
1762 nest_cancel:
1763         nla_nest_cancel(skb, devlink_port_nest);
1764         return ret;
1765 }
1766
1767 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1768                             struct net_device *dev, struct net *src_net,
1769                             int type, u32 pid, u32 seq, u32 change,
1770                             unsigned int flags, u32 ext_filter_mask,
1771                             u32 event, int *new_nsid, int new_ifindex,
1772                             int tgt_netnsid, gfp_t gfp)
1773 {
1774         struct ifinfomsg *ifm;
1775         struct nlmsghdr *nlh;
1776         struct Qdisc *qdisc;
1777
1778         ASSERT_RTNL();
1779         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1780         if (nlh == NULL)
1781                 return -EMSGSIZE;
1782
1783         ifm = nlmsg_data(nlh);
1784         ifm->ifi_family = AF_UNSPEC;
1785         ifm->__ifi_pad = 0;
1786         ifm->ifi_type = dev->type;
1787         ifm->ifi_index = dev->ifindex;
1788         ifm->ifi_flags = dev_get_flags(dev);
1789         ifm->ifi_change = change;
1790
1791         if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1792                 goto nla_put_failure;
1793
1794         qdisc = rtnl_dereference(dev->qdisc);
1795         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1796             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1797             nla_put_u8(skb, IFLA_OPERSTATE,
1798                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1799             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1800             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1801             nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1802             nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1803             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1804             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1805             nla_put_u32(skb, IFLA_ALLMULTI, dev->allmulti) ||
1806             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1807             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1808             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1809             nla_put_u32(skb, IFLA_GRO_MAX_SIZE, dev->gro_max_size) ||
1810             nla_put_u32(skb, IFLA_TSO_MAX_SIZE, dev->tso_max_size) ||
1811             nla_put_u32(skb, IFLA_TSO_MAX_SEGS, dev->tso_max_segs) ||
1812 #ifdef CONFIG_RPS
1813             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1814 #endif
1815             put_master_ifindex(skb, dev) ||
1816             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1817             (qdisc &&
1818              nla_put_string(skb, IFLA_QDISC, qdisc->ops->id)) ||
1819             nla_put_ifalias(skb, dev) ||
1820             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1821                         atomic_read(&dev->carrier_up_count) +
1822                         atomic_read(&dev->carrier_down_count)) ||
1823             nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1824                         atomic_read(&dev->carrier_up_count)) ||
1825             nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1826                         atomic_read(&dev->carrier_down_count)))
1827                 goto nla_put_failure;
1828
1829         if (rtnl_fill_proto_down(skb, dev))
1830                 goto nla_put_failure;
1831
1832         if (event != IFLA_EVENT_NONE) {
1833                 if (nla_put_u32(skb, IFLA_EVENT, event))
1834                         goto nla_put_failure;
1835         }
1836
1837         if (rtnl_fill_link_ifmap(skb, dev))
1838                 goto nla_put_failure;
1839
1840         if (dev->addr_len) {
1841                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1842                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1843                         goto nla_put_failure;
1844         }
1845
1846         if (rtnl_phys_port_id_fill(skb, dev))
1847                 goto nla_put_failure;
1848
1849         if (rtnl_phys_port_name_fill(skb, dev))
1850                 goto nla_put_failure;
1851
1852         if (rtnl_phys_switch_id_fill(skb, dev))
1853                 goto nla_put_failure;
1854
1855         if (rtnl_fill_stats(skb, dev))
1856                 goto nla_put_failure;
1857
1858         if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1859                 goto nla_put_failure;
1860
1861         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1862                 goto nla_put_failure;
1863
1864         if (rtnl_xdp_fill(skb, dev))
1865                 goto nla_put_failure;
1866
1867         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1868                 if (rtnl_link_fill(skb, dev) < 0)
1869                         goto nla_put_failure;
1870         }
1871
1872         if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1873                 goto nla_put_failure;
1874
1875         if (new_nsid &&
1876             nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1877                 goto nla_put_failure;
1878         if (new_ifindex &&
1879             nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1880                 goto nla_put_failure;
1881
1882         if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
1883             nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
1884                 goto nla_put_failure;
1885
1886         rcu_read_lock();
1887         if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1888                 goto nla_put_failure_rcu;
1889         rcu_read_unlock();
1890
1891         if (rtnl_fill_prop_list(skb, dev))
1892                 goto nla_put_failure;
1893
1894         if (dev->dev.parent &&
1895             nla_put_string(skb, IFLA_PARENT_DEV_NAME,
1896                            dev_name(dev->dev.parent)))
1897                 goto nla_put_failure;
1898
1899         if (dev->dev.parent && dev->dev.parent->bus &&
1900             nla_put_string(skb, IFLA_PARENT_DEV_BUS_NAME,
1901                            dev->dev.parent->bus->name))
1902                 goto nla_put_failure;
1903
1904         if (rtnl_fill_devlink_port(skb, dev))
1905                 goto nla_put_failure;
1906
1907         nlmsg_end(skb, nlh);
1908         return 0;
1909
1910 nla_put_failure_rcu:
1911         rcu_read_unlock();
1912 nla_put_failure:
1913         nlmsg_cancel(skb, nlh);
1914         return -EMSGSIZE;
1915 }
1916
1917 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1918         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1919         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1920         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1921         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1922         [IFLA_MTU]              = { .type = NLA_U32 },
1923         [IFLA_LINK]             = { .type = NLA_U32 },
1924         [IFLA_MASTER]           = { .type = NLA_U32 },
1925         [IFLA_CARRIER]          = { .type = NLA_U8 },
1926         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1927         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1928         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1929         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1930         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1931         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1932         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1933         /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1934          * allow 0-length string (needed to remove an alias).
1935          */
1936         [IFLA_IFALIAS]          = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1937         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1938         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1939         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1940         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1941         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1942         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1943         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1944         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1945         [IFLA_GSO_MAX_SEGS]     = { .type = NLA_U32 },
1946         [IFLA_GSO_MAX_SIZE]     = { .type = NLA_U32 },
1947         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1948         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1949         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1950         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1951         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1952         [IFLA_XDP]              = { .type = NLA_NESTED },
1953         [IFLA_EVENT]            = { .type = NLA_U32 },
1954         [IFLA_GROUP]            = { .type = NLA_U32 },
1955         [IFLA_TARGET_NETNSID]   = { .type = NLA_S32 },
1956         [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1957         [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1958         [IFLA_MIN_MTU]          = { .type = NLA_U32 },
1959         [IFLA_MAX_MTU]          = { .type = NLA_U32 },
1960         [IFLA_PROP_LIST]        = { .type = NLA_NESTED },
1961         [IFLA_ALT_IFNAME]       = { .type = NLA_STRING,
1962                                     .len = ALTIFNAMSIZ - 1 },
1963         [IFLA_PERM_ADDRESS]     = { .type = NLA_REJECT },
1964         [IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED },
1965         [IFLA_NEW_IFINDEX]      = NLA_POLICY_MIN(NLA_S32, 1),
1966         [IFLA_PARENT_DEV_NAME]  = { .type = NLA_NUL_STRING },
1967         [IFLA_GRO_MAX_SIZE]     = { .type = NLA_U32 },
1968         [IFLA_TSO_MAX_SIZE]     = { .type = NLA_REJECT },
1969         [IFLA_TSO_MAX_SEGS]     = { .type = NLA_REJECT },
1970         [IFLA_ALLMULTI]         = { .type = NLA_REJECT },
1971 };
1972
1973 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1974         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1975         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1976         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1977         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1978 };
1979
1980 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1981         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1982         [IFLA_VF_BROADCAST]     = { .type = NLA_REJECT },
1983         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1984         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1985         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1986         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1987         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1988         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1989         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1990         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1991         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1992         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1993         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1994 };
1995
1996 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1997         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1998         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1999                                     .len = PORT_PROFILE_MAX },
2000         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
2001                                       .len = PORT_UUID_MAX },
2002         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
2003                                     .len = PORT_UUID_MAX },
2004         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
2005         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
2006
2007         /* Unused, but we need to keep it here since user space could
2008          * fill it. It's also broken with regard to NLA_BINARY use in
2009          * combination with structs.
2010          */
2011         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
2012                                     .len = sizeof(struct ifla_port_vsi) },
2013 };
2014
2015 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
2016         [IFLA_XDP_UNSPEC]       = { .strict_start_type = IFLA_XDP_EXPECTED_FD },
2017         [IFLA_XDP_FD]           = { .type = NLA_S32 },
2018         [IFLA_XDP_EXPECTED_FD]  = { .type = NLA_S32 },
2019         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
2020         [IFLA_XDP_FLAGS]        = { .type = NLA_U32 },
2021         [IFLA_XDP_PROG_ID]      = { .type = NLA_U32 },
2022 };
2023
2024 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
2025 {
2026         const struct rtnl_link_ops *ops = NULL;
2027         struct nlattr *linfo[IFLA_INFO_MAX + 1];
2028
2029         if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
2030                 return NULL;
2031
2032         if (linfo[IFLA_INFO_KIND]) {
2033                 char kind[MODULE_NAME_LEN];
2034
2035                 nla_strscpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
2036                 ops = rtnl_link_ops_get(kind);
2037         }
2038
2039         return ops;
2040 }
2041
2042 static bool link_master_filtered(struct net_device *dev, int master_idx)
2043 {
2044         struct net_device *master;
2045
2046         if (!master_idx)
2047                 return false;
2048
2049         master = netdev_master_upper_dev_get(dev);
2050
2051         /* 0 is already used to denote IFLA_MASTER wasn't passed, therefore need
2052          * another invalid value for ifindex to denote "no master".
2053          */
2054         if (master_idx == -1)
2055                 return !!master;
2056
2057         if (!master || master->ifindex != master_idx)
2058                 return true;
2059
2060         return false;
2061 }
2062
2063 static bool link_kind_filtered(const struct net_device *dev,
2064                                const struct rtnl_link_ops *kind_ops)
2065 {
2066         if (kind_ops && dev->rtnl_link_ops != kind_ops)
2067                 return true;
2068
2069         return false;
2070 }
2071
2072 static bool link_dump_filtered(struct net_device *dev,
2073                                int master_idx,
2074                                const struct rtnl_link_ops *kind_ops)
2075 {
2076         if (link_master_filtered(dev, master_idx) ||
2077             link_kind_filtered(dev, kind_ops))
2078                 return true;
2079
2080         return false;
2081 }
2082
2083 /**
2084  * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
2085  * @sk: netlink socket
2086  * @netnsid: network namespace identifier
2087  *
2088  * Returns the network namespace identified by netnsid on success or an error
2089  * pointer on failure.
2090  */
2091 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
2092 {
2093         struct net *net;
2094
2095         net = get_net_ns_by_id(sock_net(sk), netnsid);
2096         if (!net)
2097                 return ERR_PTR(-EINVAL);
2098
2099         /* For now, the caller is required to have CAP_NET_ADMIN in
2100          * the user namespace owning the target net ns.
2101          */
2102         if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
2103                 put_net(net);
2104                 return ERR_PTR(-EACCES);
2105         }
2106         return net;
2107 }
2108 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
2109
2110 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
2111                                       bool strict_check, struct nlattr **tb,
2112                                       struct netlink_ext_ack *extack)
2113 {
2114         int hdrlen;
2115
2116         if (strict_check) {
2117                 struct ifinfomsg *ifm;
2118
2119                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2120                         NL_SET_ERR_MSG(extack, "Invalid header for link dump");
2121                         return -EINVAL;
2122                 }
2123
2124                 ifm = nlmsg_data(nlh);
2125                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2126                     ifm->ifi_change) {
2127                         NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
2128                         return -EINVAL;
2129                 }
2130                 if (ifm->ifi_index) {
2131                         NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
2132                         return -EINVAL;
2133                 }
2134
2135                 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
2136                                                      IFLA_MAX, ifla_policy,
2137                                                      extack);
2138         }
2139
2140         /* A hack to preserve kernel<->userspace interface.
2141          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
2142          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
2143          * what iproute2 < v3.9.0 used.
2144          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
2145          * attribute, its netlink message is shorter than struct ifinfomsg.
2146          */
2147         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2148                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2149
2150         return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
2151                                       extack);
2152 }
2153
2154 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2155 {
2156         struct netlink_ext_ack *extack = cb->extack;
2157         const struct nlmsghdr *nlh = cb->nlh;
2158         struct net *net = sock_net(skb->sk);
2159         struct net *tgt_net = net;
2160         int h, s_h;
2161         int idx = 0, s_idx;
2162         struct net_device *dev;
2163         struct hlist_head *head;
2164         struct nlattr *tb[IFLA_MAX+1];
2165         u32 ext_filter_mask = 0;
2166         const struct rtnl_link_ops *kind_ops = NULL;
2167         unsigned int flags = NLM_F_MULTI;
2168         int master_idx = 0;
2169         int netnsid = -1;
2170         int err, i;
2171
2172         s_h = cb->args[0];
2173         s_idx = cb->args[1];
2174
2175         err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
2176         if (err < 0) {
2177                 if (cb->strict_check)
2178                         return err;
2179
2180                 goto walk_entries;
2181         }
2182
2183         for (i = 0; i <= IFLA_MAX; ++i) {
2184                 if (!tb[i])
2185                         continue;
2186
2187                 /* new attributes should only be added with strict checking */
2188                 switch (i) {
2189                 case IFLA_TARGET_NETNSID:
2190                         netnsid = nla_get_s32(tb[i]);
2191                         tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
2192                         if (IS_ERR(tgt_net)) {
2193                                 NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
2194                                 return PTR_ERR(tgt_net);
2195                         }
2196                         break;
2197                 case IFLA_EXT_MASK:
2198                         ext_filter_mask = nla_get_u32(tb[i]);
2199                         break;
2200                 case IFLA_MASTER:
2201                         master_idx = nla_get_u32(tb[i]);
2202                         break;
2203                 case IFLA_LINKINFO:
2204                         kind_ops = linkinfo_to_kind_ops(tb[i]);
2205                         break;
2206                 default:
2207                         if (cb->strict_check) {
2208                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
2209                                 return -EINVAL;
2210                         }
2211                 }
2212         }
2213
2214         if (master_idx || kind_ops)
2215                 flags |= NLM_F_DUMP_FILTERED;
2216
2217 walk_entries:
2218         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2219                 idx = 0;
2220                 head = &tgt_net->dev_index_head[h];
2221                 hlist_for_each_entry(dev, head, index_hlist) {
2222                         if (link_dump_filtered(dev, master_idx, kind_ops))
2223                                 goto cont;
2224                         if (idx < s_idx)
2225                                 goto cont;
2226                         err = rtnl_fill_ifinfo(skb, dev, net,
2227                                                RTM_NEWLINK,
2228                                                NETLINK_CB(cb->skb).portid,
2229                                                nlh->nlmsg_seq, 0, flags,
2230                                                ext_filter_mask, 0, NULL, 0,
2231                                                netnsid, GFP_KERNEL);
2232
2233                         if (err < 0) {
2234                                 if (likely(skb->len))
2235                                         goto out;
2236
2237                                 goto out_err;
2238                         }
2239 cont:
2240                         idx++;
2241                 }
2242         }
2243 out:
2244         err = skb->len;
2245 out_err:
2246         cb->args[1] = idx;
2247         cb->args[0] = h;
2248         cb->seq = tgt_net->dev_base_seq;
2249         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2250         if (netnsid >= 0)
2251                 put_net(tgt_net);
2252
2253         return err;
2254 }
2255
2256 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2257                         struct netlink_ext_ack *exterr)
2258 {
2259         return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
2260                                     exterr);
2261 }
2262 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
2263
2264 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2265 {
2266         struct net *net;
2267         /* Examine the link attributes and figure out which
2268          * network namespace we are talking about.
2269          */
2270         if (tb[IFLA_NET_NS_PID])
2271                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2272         else if (tb[IFLA_NET_NS_FD])
2273                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2274         else
2275                 net = get_net(src_net);
2276         return net;
2277 }
2278 EXPORT_SYMBOL(rtnl_link_get_net);
2279
2280 /* Figure out which network namespace we are talking about by
2281  * examining the link attributes in the following order:
2282  *
2283  * 1. IFLA_NET_NS_PID
2284  * 2. IFLA_NET_NS_FD
2285  * 3. IFLA_TARGET_NETNSID
2286  */
2287 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2288                                                struct nlattr *tb[])
2289 {
2290         struct net *net;
2291
2292         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2293                 return rtnl_link_get_net(src_net, tb);
2294
2295         if (!tb[IFLA_TARGET_NETNSID])
2296                 return get_net(src_net);
2297
2298         net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2299         if (!net)
2300                 return ERR_PTR(-EINVAL);
2301
2302         return net;
2303 }
2304
2305 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2306                                              struct net *src_net,
2307                                              struct nlattr *tb[], int cap)
2308 {
2309         struct net *net;
2310
2311         net = rtnl_link_get_net_by_nlattr(src_net, tb);
2312         if (IS_ERR(net))
2313                 return net;
2314
2315         if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2316                 put_net(net);
2317                 return ERR_PTR(-EPERM);
2318         }
2319
2320         return net;
2321 }
2322
2323 /* Verify that rtnetlink requests do not pass additional properties
2324  * potentially referring to different network namespaces.
2325  */
2326 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2327                                     struct netlink_ext_ack *extack,
2328                                     bool netns_id_only)
2329 {
2330
2331         if (netns_id_only) {
2332                 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2333                         return 0;
2334
2335                 NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2336                 return -EOPNOTSUPP;
2337         }
2338
2339         if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2340                 goto invalid_attr;
2341
2342         if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2343                 goto invalid_attr;
2344
2345         if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2346                 goto invalid_attr;
2347
2348         return 0;
2349
2350 invalid_attr:
2351         NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2352         return -EINVAL;
2353 }
2354
2355 static  int rtnl_set_vf_rate(struct net_device *dev, int vf, int min_tx_rate,
2356                              int max_tx_rate)
2357 {
2358         const struct net_device_ops *ops = dev->netdev_ops;
2359
2360         if (!ops->ndo_set_vf_rate)
2361                 return -EOPNOTSUPP;
2362         if (max_tx_rate && max_tx_rate < min_tx_rate)
2363                 return -EINVAL;
2364
2365         return ops->ndo_set_vf_rate(dev, vf, min_tx_rate, max_tx_rate);
2366 }
2367
2368 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[],
2369                             struct netlink_ext_ack *extack)
2370 {
2371         if (dev) {
2372                 if (tb[IFLA_ADDRESS] &&
2373                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2374                         return -EINVAL;
2375
2376                 if (tb[IFLA_BROADCAST] &&
2377                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2378                         return -EINVAL;
2379         }
2380
2381         if (tb[IFLA_AF_SPEC]) {
2382                 struct nlattr *af;
2383                 int rem, err;
2384
2385                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2386                         const struct rtnl_af_ops *af_ops;
2387
2388                         af_ops = rtnl_af_lookup(nla_type(af));
2389                         if (!af_ops)
2390                                 return -EAFNOSUPPORT;
2391
2392                         if (!af_ops->set_link_af)
2393                                 return -EOPNOTSUPP;
2394
2395                         if (af_ops->validate_link_af) {
2396                                 err = af_ops->validate_link_af(dev, af, extack);
2397                                 if (err < 0)
2398                                         return err;
2399                         }
2400                 }
2401         }
2402
2403         return 0;
2404 }
2405
2406 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2407                                   int guid_type)
2408 {
2409         const struct net_device_ops *ops = dev->netdev_ops;
2410
2411         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2412 }
2413
2414 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2415 {
2416         if (dev->type != ARPHRD_INFINIBAND)
2417                 return -EOPNOTSUPP;
2418
2419         return handle_infiniband_guid(dev, ivt, guid_type);
2420 }
2421
2422 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2423 {
2424         const struct net_device_ops *ops = dev->netdev_ops;
2425         int err = -EINVAL;
2426
2427         if (tb[IFLA_VF_MAC]) {
2428                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2429
2430                 if (ivm->vf >= INT_MAX)
2431                         return -EINVAL;
2432                 err = -EOPNOTSUPP;
2433                 if (ops->ndo_set_vf_mac)
2434                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
2435                                                   ivm->mac);
2436                 if (err < 0)
2437                         return err;
2438         }
2439
2440         if (tb[IFLA_VF_VLAN]) {
2441                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2442
2443                 if (ivv->vf >= INT_MAX)
2444                         return -EINVAL;
2445                 err = -EOPNOTSUPP;
2446                 if (ops->ndo_set_vf_vlan)
2447                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2448                                                    ivv->qos,
2449                                                    htons(ETH_P_8021Q));
2450                 if (err < 0)
2451                         return err;
2452         }
2453
2454         if (tb[IFLA_VF_VLAN_LIST]) {
2455                 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2456                 struct nlattr *attr;
2457                 int rem, len = 0;
2458
2459                 err = -EOPNOTSUPP;
2460                 if (!ops->ndo_set_vf_vlan)
2461                         return err;
2462
2463                 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2464                         if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2465                             nla_len(attr) < NLA_HDRLEN) {
2466                                 return -EINVAL;
2467                         }
2468                         if (len >= MAX_VLAN_LIST_LEN)
2469                                 return -EOPNOTSUPP;
2470                         ivvl[len] = nla_data(attr);
2471
2472                         len++;
2473                 }
2474                 if (len == 0)
2475                         return -EINVAL;
2476
2477                 if (ivvl[0]->vf >= INT_MAX)
2478                         return -EINVAL;
2479                 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2480                                            ivvl[0]->qos, ivvl[0]->vlan_proto);
2481                 if (err < 0)
2482                         return err;
2483         }
2484
2485         if (tb[IFLA_VF_TX_RATE]) {
2486                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2487                 struct ifla_vf_info ivf;
2488
2489                 if (ivt->vf >= INT_MAX)
2490                         return -EINVAL;
2491                 err = -EOPNOTSUPP;
2492                 if (ops->ndo_get_vf_config)
2493                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2494                 if (err < 0)
2495                         return err;
2496
2497                 err = rtnl_set_vf_rate(dev, ivt->vf,
2498                                        ivf.min_tx_rate, ivt->rate);
2499                 if (err < 0)
2500                         return err;
2501         }
2502
2503         if (tb[IFLA_VF_RATE]) {
2504                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2505
2506                 if (ivt->vf >= INT_MAX)
2507                         return -EINVAL;
2508
2509                 err = rtnl_set_vf_rate(dev, ivt->vf,
2510                                        ivt->min_tx_rate, ivt->max_tx_rate);
2511                 if (err < 0)
2512                         return err;
2513         }
2514
2515         if (tb[IFLA_VF_SPOOFCHK]) {
2516                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2517
2518                 if (ivs->vf >= INT_MAX)
2519                         return -EINVAL;
2520                 err = -EOPNOTSUPP;
2521                 if (ops->ndo_set_vf_spoofchk)
2522                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2523                                                        ivs->setting);
2524                 if (err < 0)
2525                         return err;
2526         }
2527
2528         if (tb[IFLA_VF_LINK_STATE]) {
2529                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2530
2531                 if (ivl->vf >= INT_MAX)
2532                         return -EINVAL;
2533                 err = -EOPNOTSUPP;
2534                 if (ops->ndo_set_vf_link_state)
2535                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2536                                                          ivl->link_state);
2537                 if (err < 0)
2538                         return err;
2539         }
2540
2541         if (tb[IFLA_VF_RSS_QUERY_EN]) {
2542                 struct ifla_vf_rss_query_en *ivrssq_en;
2543
2544                 err = -EOPNOTSUPP;
2545                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2546                 if (ivrssq_en->vf >= INT_MAX)
2547                         return -EINVAL;
2548                 if (ops->ndo_set_vf_rss_query_en)
2549                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2550                                                            ivrssq_en->setting);
2551                 if (err < 0)
2552                         return err;
2553         }
2554
2555         if (tb[IFLA_VF_TRUST]) {
2556                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2557
2558                 if (ivt->vf >= INT_MAX)
2559                         return -EINVAL;
2560                 err = -EOPNOTSUPP;
2561                 if (ops->ndo_set_vf_trust)
2562                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2563                 if (err < 0)
2564                         return err;
2565         }
2566
2567         if (tb[IFLA_VF_IB_NODE_GUID]) {
2568                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2569
2570                 if (ivt->vf >= INT_MAX)
2571                         return -EINVAL;
2572                 if (!ops->ndo_set_vf_guid)
2573                         return -EOPNOTSUPP;
2574                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2575         }
2576
2577         if (tb[IFLA_VF_IB_PORT_GUID]) {
2578                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2579
2580                 if (ivt->vf >= INT_MAX)
2581                         return -EINVAL;
2582                 if (!ops->ndo_set_vf_guid)
2583                         return -EOPNOTSUPP;
2584
2585                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2586         }
2587
2588         return err;
2589 }
2590
2591 static int do_set_master(struct net_device *dev, int ifindex,
2592                          struct netlink_ext_ack *extack)
2593 {
2594         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2595         const struct net_device_ops *ops;
2596         int err;
2597
2598         if (upper_dev) {
2599                 if (upper_dev->ifindex == ifindex)
2600                         return 0;
2601                 ops = upper_dev->netdev_ops;
2602                 if (ops->ndo_del_slave) {
2603                         err = ops->ndo_del_slave(upper_dev, dev);
2604                         if (err)
2605                                 return err;
2606                 } else {
2607                         return -EOPNOTSUPP;
2608                 }
2609         }
2610
2611         if (ifindex) {
2612                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2613                 if (!upper_dev)
2614                         return -EINVAL;
2615                 ops = upper_dev->netdev_ops;
2616                 if (ops->ndo_add_slave) {
2617                         err = ops->ndo_add_slave(upper_dev, dev, extack);
2618                         if (err)
2619                                 return err;
2620                 } else {
2621                         return -EOPNOTSUPP;
2622                 }
2623         }
2624         return 0;
2625 }
2626
2627 static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = {
2628         [IFLA_PROTO_DOWN_REASON_MASK]   = { .type = NLA_U32 },
2629         [IFLA_PROTO_DOWN_REASON_VALUE]  = { .type = NLA_U32 },
2630 };
2631
2632 static int do_set_proto_down(struct net_device *dev,
2633                              struct nlattr *nl_proto_down,
2634                              struct nlattr *nl_proto_down_reason,
2635                              struct netlink_ext_ack *extack)
2636 {
2637         struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1];
2638         unsigned long mask = 0;
2639         u32 value;
2640         bool proto_down;
2641         int err;
2642
2643         if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN)) {
2644                 NL_SET_ERR_MSG(extack,  "Protodown not supported by device");
2645                 return -EOPNOTSUPP;
2646         }
2647
2648         if (nl_proto_down_reason) {
2649                 err = nla_parse_nested_deprecated(pdreason,
2650                                                   IFLA_PROTO_DOWN_REASON_MAX,
2651                                                   nl_proto_down_reason,
2652                                                   ifla_proto_down_reason_policy,
2653                                                   NULL);
2654                 if (err < 0)
2655                         return err;
2656
2657                 if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) {
2658                         NL_SET_ERR_MSG(extack, "Invalid protodown reason value");
2659                         return -EINVAL;
2660                 }
2661
2662                 value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]);
2663
2664                 if (pdreason[IFLA_PROTO_DOWN_REASON_MASK])
2665                         mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]);
2666
2667                 dev_change_proto_down_reason(dev, mask, value);
2668         }
2669
2670         if (nl_proto_down) {
2671                 proto_down = nla_get_u8(nl_proto_down);
2672
2673                 /* Don't turn off protodown if there are active reasons */
2674                 if (!proto_down && dev->proto_down_reason) {
2675                         NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons");
2676                         return -EBUSY;
2677                 }
2678                 err = dev_change_proto_down(dev,
2679                                             proto_down);
2680                 if (err)
2681                         return err;
2682         }
2683
2684         return 0;
2685 }
2686
2687 #define DO_SETLINK_MODIFIED     0x01
2688 /* notify flag means notify + modified. */
2689 #define DO_SETLINK_NOTIFY       0x03
2690 static int do_setlink(const struct sk_buff *skb,
2691                       struct net_device *dev, struct ifinfomsg *ifm,
2692                       struct netlink_ext_ack *extack,
2693                       struct nlattr **tb, int status)
2694 {
2695         const struct net_device_ops *ops = dev->netdev_ops;
2696         char ifname[IFNAMSIZ];
2697         int err;
2698
2699         err = validate_linkmsg(dev, tb, extack);
2700         if (err < 0)
2701                 return err;
2702
2703         if (tb[IFLA_IFNAME])
2704                 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2705         else
2706                 ifname[0] = '\0';
2707
2708         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2709                 const char *pat = ifname[0] ? ifname : NULL;
2710                 struct net *net;
2711                 int new_ifindex;
2712
2713                 net = rtnl_link_get_net_capable(skb, dev_net(dev),
2714                                                 tb, CAP_NET_ADMIN);
2715                 if (IS_ERR(net)) {
2716                         err = PTR_ERR(net);
2717                         goto errout;
2718                 }
2719
2720                 if (tb[IFLA_NEW_IFINDEX])
2721                         new_ifindex = nla_get_s32(tb[IFLA_NEW_IFINDEX]);
2722                 else
2723                         new_ifindex = 0;
2724
2725                 err = __dev_change_net_namespace(dev, net, pat, new_ifindex);
2726                 put_net(net);
2727                 if (err)
2728                         goto errout;
2729                 status |= DO_SETLINK_MODIFIED;
2730         }
2731
2732         if (tb[IFLA_MAP]) {
2733                 struct rtnl_link_ifmap *u_map;
2734                 struct ifmap k_map;
2735
2736                 if (!ops->ndo_set_config) {
2737                         err = -EOPNOTSUPP;
2738                         goto errout;
2739                 }
2740
2741                 if (!netif_device_present(dev)) {
2742                         err = -ENODEV;
2743                         goto errout;
2744                 }
2745
2746                 u_map = nla_data(tb[IFLA_MAP]);
2747                 k_map.mem_start = (unsigned long) u_map->mem_start;
2748                 k_map.mem_end = (unsigned long) u_map->mem_end;
2749                 k_map.base_addr = (unsigned short) u_map->base_addr;
2750                 k_map.irq = (unsigned char) u_map->irq;
2751                 k_map.dma = (unsigned char) u_map->dma;
2752                 k_map.port = (unsigned char) u_map->port;
2753
2754                 err = ops->ndo_set_config(dev, &k_map);
2755                 if (err < 0)
2756                         goto errout;
2757
2758                 status |= DO_SETLINK_NOTIFY;
2759         }
2760
2761         if (tb[IFLA_ADDRESS]) {
2762                 struct sockaddr *sa;
2763                 int len;
2764
2765                 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2766                                                   sizeof(*sa));
2767                 sa = kmalloc(len, GFP_KERNEL);
2768                 if (!sa) {
2769                         err = -ENOMEM;
2770                         goto errout;
2771                 }
2772                 sa->sa_family = dev->type;
2773                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2774                        dev->addr_len);
2775                 err = dev_set_mac_address_user(dev, sa, extack);
2776                 kfree(sa);
2777                 if (err)
2778                         goto errout;
2779                 status |= DO_SETLINK_MODIFIED;
2780         }
2781
2782         if (tb[IFLA_MTU]) {
2783                 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2784                 if (err < 0)
2785                         goto errout;
2786                 status |= DO_SETLINK_MODIFIED;
2787         }
2788
2789         if (tb[IFLA_GROUP]) {
2790                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2791                 status |= DO_SETLINK_NOTIFY;
2792         }
2793
2794         /*
2795          * Interface selected by interface index but interface
2796          * name provided implies that a name change has been
2797          * requested.
2798          */
2799         if (ifm->ifi_index > 0 && ifname[0]) {
2800                 err = dev_change_name(dev, ifname);
2801                 if (err < 0)
2802                         goto errout;
2803                 status |= DO_SETLINK_MODIFIED;
2804         }
2805
2806         if (tb[IFLA_IFALIAS]) {
2807                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2808                                     nla_len(tb[IFLA_IFALIAS]));
2809                 if (err < 0)
2810                         goto errout;
2811                 status |= DO_SETLINK_NOTIFY;
2812         }
2813
2814         if (tb[IFLA_BROADCAST]) {
2815                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2816                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2817         }
2818
2819         if (tb[IFLA_MASTER]) {
2820                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2821                 if (err)
2822                         goto errout;
2823                 status |= DO_SETLINK_MODIFIED;
2824         }
2825
2826         if (ifm->ifi_flags || ifm->ifi_change) {
2827                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2828                                        extack);
2829                 if (err < 0)
2830                         goto errout;
2831         }
2832
2833         if (tb[IFLA_CARRIER]) {
2834                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2835                 if (err)
2836                         goto errout;
2837                 status |= DO_SETLINK_MODIFIED;
2838         }
2839
2840         if (tb[IFLA_TXQLEN]) {
2841                 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2842
2843                 err = dev_change_tx_queue_len(dev, value);
2844                 if (err)
2845                         goto errout;
2846                 status |= DO_SETLINK_MODIFIED;
2847         }
2848
2849         if (tb[IFLA_GSO_MAX_SIZE]) {
2850                 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2851
2852                 if (max_size > dev->tso_max_size) {
2853                         err = -EINVAL;
2854                         goto errout;
2855                 }
2856
2857                 if (dev->gso_max_size ^ max_size) {
2858                         netif_set_gso_max_size(dev, max_size);
2859                         status |= DO_SETLINK_MODIFIED;
2860                 }
2861         }
2862
2863         if (tb[IFLA_GSO_MAX_SEGS]) {
2864                 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2865
2866                 if (max_segs > GSO_MAX_SEGS || max_segs > dev->tso_max_segs) {
2867                         err = -EINVAL;
2868                         goto errout;
2869                 }
2870
2871                 if (dev->gso_max_segs ^ max_segs) {
2872                         netif_set_gso_max_segs(dev, max_segs);
2873                         status |= DO_SETLINK_MODIFIED;
2874                 }
2875         }
2876
2877         if (tb[IFLA_GRO_MAX_SIZE]) {
2878                 u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_MAX_SIZE]);
2879
2880                 if (dev->gro_max_size ^ gro_max_size) {
2881                         netif_set_gro_max_size(dev, gro_max_size);
2882                         status |= DO_SETLINK_MODIFIED;
2883                 }
2884         }
2885
2886         if (tb[IFLA_OPERSTATE])
2887                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2888
2889         if (tb[IFLA_LINKMODE]) {
2890                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2891
2892                 write_lock(&dev_base_lock);
2893                 if (dev->link_mode ^ value)
2894                         status |= DO_SETLINK_NOTIFY;
2895                 dev->link_mode = value;
2896                 write_unlock(&dev_base_lock);
2897         }
2898
2899         if (tb[IFLA_VFINFO_LIST]) {
2900                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2901                 struct nlattr *attr;
2902                 int rem;
2903
2904                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2905                         if (nla_type(attr) != IFLA_VF_INFO ||
2906                             nla_len(attr) < NLA_HDRLEN) {
2907                                 err = -EINVAL;
2908                                 goto errout;
2909                         }
2910                         err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
2911                                                           attr,
2912                                                           ifla_vf_policy,
2913                                                           NULL);
2914                         if (err < 0)
2915                                 goto errout;
2916                         err = do_setvfinfo(dev, vfinfo);
2917                         if (err < 0)
2918                                 goto errout;
2919                         status |= DO_SETLINK_NOTIFY;
2920                 }
2921         }
2922         err = 0;
2923
2924         if (tb[IFLA_VF_PORTS]) {
2925                 struct nlattr *port[IFLA_PORT_MAX+1];
2926                 struct nlattr *attr;
2927                 int vf;
2928                 int rem;
2929
2930                 err = -EOPNOTSUPP;
2931                 if (!ops->ndo_set_vf_port)
2932                         goto errout;
2933
2934                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2935                         if (nla_type(attr) != IFLA_VF_PORT ||
2936                             nla_len(attr) < NLA_HDRLEN) {
2937                                 err = -EINVAL;
2938                                 goto errout;
2939                         }
2940                         err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2941                                                           attr,
2942                                                           ifla_port_policy,
2943                                                           NULL);
2944                         if (err < 0)
2945                                 goto errout;
2946                         if (!port[IFLA_PORT_VF]) {
2947                                 err = -EOPNOTSUPP;
2948                                 goto errout;
2949                         }
2950                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2951                         err = ops->ndo_set_vf_port(dev, vf, port);
2952                         if (err < 0)
2953                                 goto errout;
2954                         status |= DO_SETLINK_NOTIFY;
2955                 }
2956         }
2957         err = 0;
2958
2959         if (tb[IFLA_PORT_SELF]) {
2960                 struct nlattr *port[IFLA_PORT_MAX+1];
2961
2962                 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2963                                                   tb[IFLA_PORT_SELF],
2964                                                   ifla_port_policy, NULL);
2965                 if (err < 0)
2966                         goto errout;
2967
2968                 err = -EOPNOTSUPP;
2969                 if (ops->ndo_set_vf_port)
2970                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2971                 if (err < 0)
2972                         goto errout;
2973                 status |= DO_SETLINK_NOTIFY;
2974         }
2975
2976         if (tb[IFLA_AF_SPEC]) {
2977                 struct nlattr *af;
2978                 int rem;
2979
2980                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2981                         const struct rtnl_af_ops *af_ops;
2982
2983                         BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2984
2985                         err = af_ops->set_link_af(dev, af, extack);
2986                         if (err < 0)
2987                                 goto errout;
2988
2989                         status |= DO_SETLINK_NOTIFY;
2990                 }
2991         }
2992         err = 0;
2993
2994         if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) {
2995                 err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN],
2996                                         tb[IFLA_PROTO_DOWN_REASON], extack);
2997                 if (err)
2998                         goto errout;
2999                 status |= DO_SETLINK_NOTIFY;
3000         }
3001
3002         if (tb[IFLA_XDP]) {
3003                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
3004                 u32 xdp_flags = 0;
3005
3006                 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
3007                                                   tb[IFLA_XDP],
3008                                                   ifla_xdp_policy, NULL);
3009                 if (err < 0)
3010                         goto errout;
3011
3012                 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
3013                         err = -EINVAL;
3014                         goto errout;
3015                 }
3016
3017                 if (xdp[IFLA_XDP_FLAGS]) {
3018                         xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
3019                         if (xdp_flags & ~XDP_FLAGS_MASK) {
3020                                 err = -EINVAL;
3021                                 goto errout;
3022                         }
3023                         if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
3024                                 err = -EINVAL;
3025                                 goto errout;
3026                         }
3027                 }
3028
3029                 if (xdp[IFLA_XDP_FD]) {
3030                         int expected_fd = -1;
3031
3032                         if (xdp_flags & XDP_FLAGS_REPLACE) {
3033                                 if (!xdp[IFLA_XDP_EXPECTED_FD]) {
3034                                         err = -EINVAL;
3035                                         goto errout;
3036                                 }
3037                                 expected_fd =
3038                                         nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]);
3039                         }
3040
3041                         err = dev_change_xdp_fd(dev, extack,
3042                                                 nla_get_s32(xdp[IFLA_XDP_FD]),
3043                                                 expected_fd,
3044                                                 xdp_flags);
3045                         if (err)
3046                                 goto errout;
3047                         status |= DO_SETLINK_NOTIFY;
3048                 }
3049         }
3050
3051 errout:
3052         if (status & DO_SETLINK_MODIFIED) {
3053                 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
3054                         netdev_state_change(dev);
3055
3056                 if (err < 0)
3057                         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",
3058                                              dev->name);
3059         }
3060
3061         return err;
3062 }
3063
3064 static struct net_device *rtnl_dev_get(struct net *net,
3065                                        struct nlattr *tb[])
3066 {
3067         char ifname[ALTIFNAMSIZ];
3068
3069         if (tb[IFLA_IFNAME])
3070                 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3071         else if (tb[IFLA_ALT_IFNAME])
3072                 nla_strscpy(ifname, tb[IFLA_ALT_IFNAME], ALTIFNAMSIZ);
3073         else
3074                 return NULL;
3075
3076         return __dev_get_by_name(net, ifname);
3077 }
3078
3079 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3080                         struct netlink_ext_ack *extack)
3081 {
3082         struct net *net = sock_net(skb->sk);
3083         struct ifinfomsg *ifm;
3084         struct net_device *dev;
3085         int err;
3086         struct nlattr *tb[IFLA_MAX+1];
3087
3088         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3089                                      ifla_policy, extack);
3090         if (err < 0)
3091                 goto errout;
3092
3093         err = rtnl_ensure_unique_netns(tb, extack, false);
3094         if (err < 0)
3095                 goto errout;
3096
3097         err = -EINVAL;
3098         ifm = nlmsg_data(nlh);
3099         if (ifm->ifi_index > 0)
3100                 dev = __dev_get_by_index(net, ifm->ifi_index);
3101         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3102                 dev = rtnl_dev_get(net, tb);
3103         else
3104                 goto errout;
3105
3106         if (dev == NULL) {
3107                 err = -ENODEV;
3108                 goto errout;
3109         }
3110
3111         err = do_setlink(skb, dev, ifm, extack, tb, 0);
3112 errout:
3113         return err;
3114 }
3115
3116 static int rtnl_group_dellink(const struct net *net, int group)
3117 {
3118         struct net_device *dev, *aux;
3119         LIST_HEAD(list_kill);
3120         bool found = false;
3121
3122         if (!group)
3123                 return -EPERM;
3124
3125         for_each_netdev(net, dev) {
3126                 if (dev->group == group) {
3127                         const struct rtnl_link_ops *ops;
3128
3129                         found = true;
3130                         ops = dev->rtnl_link_ops;
3131                         if (!ops || !ops->dellink)
3132                                 return -EOPNOTSUPP;
3133                 }
3134         }
3135
3136         if (!found)
3137                 return -ENODEV;
3138
3139         for_each_netdev_safe(net, dev, aux) {
3140                 if (dev->group == group) {
3141                         const struct rtnl_link_ops *ops;
3142
3143                         ops = dev->rtnl_link_ops;
3144                         ops->dellink(dev, &list_kill);
3145                 }
3146         }
3147         unregister_netdevice_many(&list_kill);
3148
3149         return 0;
3150 }
3151
3152 int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh)
3153 {
3154         const struct rtnl_link_ops *ops;
3155         LIST_HEAD(list_kill);
3156
3157         ops = dev->rtnl_link_ops;
3158         if (!ops || !ops->dellink)
3159                 return -EOPNOTSUPP;
3160
3161         ops->dellink(dev, &list_kill);
3162         unregister_netdevice_many_notify(&list_kill, portid, nlh);
3163
3164         return 0;
3165 }
3166 EXPORT_SYMBOL_GPL(rtnl_delete_link);
3167
3168 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
3169                         struct netlink_ext_ack *extack)
3170 {
3171         struct net *net = sock_net(skb->sk);
3172         u32 portid = NETLINK_CB(skb).portid;
3173         struct net *tgt_net = net;
3174         struct net_device *dev = NULL;
3175         struct ifinfomsg *ifm;
3176         struct nlattr *tb[IFLA_MAX+1];
3177         int err;
3178         int netnsid = -1;
3179
3180         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3181                                      ifla_policy, extack);
3182         if (err < 0)
3183                 return err;
3184
3185         err = rtnl_ensure_unique_netns(tb, extack, true);
3186         if (err < 0)
3187                 return err;
3188
3189         if (tb[IFLA_TARGET_NETNSID]) {
3190                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3191                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3192                 if (IS_ERR(tgt_net))
3193                         return PTR_ERR(tgt_net);
3194         }
3195
3196         err = -EINVAL;
3197         ifm = nlmsg_data(nlh);
3198         if (ifm->ifi_index > 0)
3199                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3200         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3201                 dev = rtnl_dev_get(net, tb);
3202         else if (tb[IFLA_GROUP])
3203                 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
3204         else
3205                 goto out;
3206
3207         if (!dev) {
3208                 if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME] || ifm->ifi_index > 0)
3209                         err = -ENODEV;
3210
3211                 goto out;
3212         }
3213
3214         err = rtnl_delete_link(dev, portid, nlh);
3215
3216 out:
3217         if (netnsid >= 0)
3218                 put_net(tgt_net);
3219
3220         return err;
3221 }
3222
3223 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm,
3224                         u32 portid, const struct nlmsghdr *nlh)
3225 {
3226         unsigned int old_flags;
3227         int err;
3228
3229         old_flags = dev->flags;
3230         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
3231                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
3232                                          NULL);
3233                 if (err < 0)
3234                         return err;
3235         }
3236
3237         if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
3238                 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags), portid, nlh);
3239         } else {
3240                 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
3241                 __dev_notify_flags(dev, old_flags, ~0U, portid, nlh);
3242         }
3243         return 0;
3244 }
3245 EXPORT_SYMBOL(rtnl_configure_link);
3246
3247 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
3248                                     unsigned char name_assign_type,
3249                                     const struct rtnl_link_ops *ops,
3250                                     struct nlattr *tb[],
3251                                     struct netlink_ext_ack *extack)
3252 {
3253         struct net_device *dev;
3254         unsigned int num_tx_queues = 1;
3255         unsigned int num_rx_queues = 1;
3256
3257         if (tb[IFLA_NUM_TX_QUEUES])
3258                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
3259         else if (ops->get_num_tx_queues)
3260                 num_tx_queues = ops->get_num_tx_queues();
3261
3262         if (tb[IFLA_NUM_RX_QUEUES])
3263                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
3264         else if (ops->get_num_rx_queues)
3265                 num_rx_queues = ops->get_num_rx_queues();
3266
3267         if (num_tx_queues < 1 || num_tx_queues > 4096) {
3268                 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
3269                 return ERR_PTR(-EINVAL);
3270         }
3271
3272         if (num_rx_queues < 1 || num_rx_queues > 4096) {
3273                 NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
3274                 return ERR_PTR(-EINVAL);
3275         }
3276
3277         if (ops->alloc) {
3278                 dev = ops->alloc(tb, ifname, name_assign_type,
3279                                  num_tx_queues, num_rx_queues);
3280                 if (IS_ERR(dev))
3281                         return dev;
3282         } else {
3283                 dev = alloc_netdev_mqs(ops->priv_size, ifname,
3284                                        name_assign_type, ops->setup,
3285                                        num_tx_queues, num_rx_queues);
3286         }
3287
3288         if (!dev)
3289                 return ERR_PTR(-ENOMEM);
3290
3291         dev_net_set(dev, net);
3292         dev->rtnl_link_ops = ops;
3293         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
3294
3295         if (tb[IFLA_MTU]) {
3296                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3297                 int err;
3298
3299                 err = dev_validate_mtu(dev, mtu, extack);
3300                 if (err) {
3301                         free_netdev(dev);
3302                         return ERR_PTR(err);
3303                 }
3304                 dev->mtu = mtu;
3305         }
3306         if (tb[IFLA_ADDRESS]) {
3307                 __dev_addr_set(dev, nla_data(tb[IFLA_ADDRESS]),
3308                                nla_len(tb[IFLA_ADDRESS]));
3309                 dev->addr_assign_type = NET_ADDR_SET;
3310         }
3311         if (tb[IFLA_BROADCAST])
3312                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
3313                                 nla_len(tb[IFLA_BROADCAST]));
3314         if (tb[IFLA_TXQLEN])
3315                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
3316         if (tb[IFLA_OPERSTATE])
3317                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
3318         if (tb[IFLA_LINKMODE])
3319                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
3320         if (tb[IFLA_GROUP])
3321                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
3322         if (tb[IFLA_GSO_MAX_SIZE])
3323                 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
3324         if (tb[IFLA_GSO_MAX_SEGS])
3325                 netif_set_gso_max_segs(dev, nla_get_u32(tb[IFLA_GSO_MAX_SEGS]));
3326         if (tb[IFLA_GRO_MAX_SIZE])
3327                 netif_set_gro_max_size(dev, nla_get_u32(tb[IFLA_GRO_MAX_SIZE]));
3328
3329         return dev;
3330 }
3331 EXPORT_SYMBOL(rtnl_create_link);
3332
3333 static int rtnl_group_changelink(const struct sk_buff *skb,
3334                 struct net *net, int group,
3335                 struct ifinfomsg *ifm,
3336                 struct netlink_ext_ack *extack,
3337                 struct nlattr **tb)
3338 {
3339         struct net_device *dev, *aux;
3340         int err;
3341
3342         for_each_netdev_safe(net, dev, aux) {
3343                 if (dev->group == group) {
3344                         err = do_setlink(skb, dev, ifm, extack, tb, 0);
3345                         if (err < 0)
3346                                 return err;
3347                 }
3348         }
3349
3350         return 0;
3351 }
3352
3353 static int rtnl_newlink_create(struct sk_buff *skb, struct ifinfomsg *ifm,
3354                                const struct rtnl_link_ops *ops,
3355                                const struct nlmsghdr *nlh,
3356                                struct nlattr **tb, struct nlattr **data,
3357                                struct netlink_ext_ack *extack)
3358 {
3359         unsigned char name_assign_type = NET_NAME_USER;
3360         struct net *net = sock_net(skb->sk);
3361         u32 portid = NETLINK_CB(skb).portid;
3362         struct net *dest_net, *link_net;
3363         struct net_device *dev;
3364         char ifname[IFNAMSIZ];
3365         int err;
3366
3367         if (!ops->alloc && !ops->setup)
3368                 return -EOPNOTSUPP;
3369
3370         if (tb[IFLA_IFNAME]) {
3371                 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3372         } else {
3373                 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3374                 name_assign_type = NET_NAME_ENUM;
3375         }
3376
3377         dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3378         if (IS_ERR(dest_net))
3379                 return PTR_ERR(dest_net);
3380
3381         if (tb[IFLA_LINK_NETNSID]) {
3382                 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3383
3384                 link_net = get_net_ns_by_id(dest_net, id);
3385                 if (!link_net) {
3386                         NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3387                         err =  -EINVAL;
3388                         goto out;
3389                 }
3390                 err = -EPERM;
3391                 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3392                         goto out;
3393         } else {
3394                 link_net = NULL;
3395         }
3396
3397         dev = rtnl_create_link(link_net ? : dest_net, ifname,
3398                                name_assign_type, ops, tb, extack);
3399         if (IS_ERR(dev)) {
3400                 err = PTR_ERR(dev);
3401                 goto out;
3402         }
3403
3404         dev->ifindex = ifm->ifi_index;
3405
3406         if (ops->newlink)
3407                 err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3408         else
3409                 err = register_netdevice(dev);
3410         if (err < 0) {
3411                 free_netdev(dev);
3412                 goto out;
3413         }
3414
3415         err = rtnl_configure_link(dev, ifm, portid, nlh);
3416         if (err < 0)
3417                 goto out_unregister;
3418         if (link_net) {
3419                 err = dev_change_net_namespace(dev, dest_net, ifname);
3420                 if (err < 0)
3421                         goto out_unregister;
3422         }
3423         if (tb[IFLA_MASTER]) {
3424                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3425                 if (err)
3426                         goto out_unregister;
3427         }
3428 out:
3429         if (link_net)
3430                 put_net(link_net);
3431         put_net(dest_net);
3432         return err;
3433 out_unregister:
3434         if (ops->newlink) {
3435                 LIST_HEAD(list_kill);
3436
3437                 ops->dellink(dev, &list_kill);
3438                 unregister_netdevice_many(&list_kill);
3439         } else {
3440                 unregister_netdevice(dev);
3441         }
3442         goto out;
3443 }
3444
3445 struct rtnl_newlink_tbs {
3446         struct nlattr *tb[IFLA_MAX + 1];
3447         struct nlattr *attr[RTNL_MAX_TYPE + 1];
3448         struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3449 };
3450
3451 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3452                           struct rtnl_newlink_tbs *tbs,
3453                           struct netlink_ext_ack *extack)
3454 {
3455         struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
3456         struct nlattr ** const tb = tbs->tb;
3457         const struct rtnl_link_ops *m_ops;
3458         struct net_device *master_dev;
3459         struct net *net = sock_net(skb->sk);
3460         const struct rtnl_link_ops *ops;
3461         struct nlattr **slave_data;
3462         char kind[MODULE_NAME_LEN];
3463         struct net_device *dev;
3464         struct ifinfomsg *ifm;
3465         struct nlattr **data;
3466         bool link_specified;
3467         int err;
3468
3469 #ifdef CONFIG_MODULES
3470 replay:
3471 #endif
3472         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3473                                      ifla_policy, extack);
3474         if (err < 0)
3475                 return err;
3476
3477         err = rtnl_ensure_unique_netns(tb, extack, false);
3478         if (err < 0)
3479                 return err;
3480
3481         ifm = nlmsg_data(nlh);
3482         if (ifm->ifi_index > 0) {
3483                 link_specified = true;
3484                 dev = __dev_get_by_index(net, ifm->ifi_index);
3485         } else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) {
3486                 link_specified = true;
3487                 dev = rtnl_dev_get(net, tb);
3488         } else {
3489                 link_specified = false;
3490                 dev = NULL;
3491         }
3492
3493         master_dev = NULL;
3494         m_ops = NULL;
3495         if (dev) {
3496                 master_dev = netdev_master_upper_dev_get(dev);
3497                 if (master_dev)
3498                         m_ops = master_dev->rtnl_link_ops;
3499         }
3500
3501         err = validate_linkmsg(dev, tb, extack);
3502         if (err < 0)
3503                 return err;
3504
3505         if (tb[IFLA_LINKINFO]) {
3506                 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3507                                                   tb[IFLA_LINKINFO],
3508                                                   ifla_info_policy, NULL);
3509                 if (err < 0)
3510                         return err;
3511         } else
3512                 memset(linkinfo, 0, sizeof(linkinfo));
3513
3514         if (linkinfo[IFLA_INFO_KIND]) {
3515                 nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3516                 ops = rtnl_link_ops_get(kind);
3517         } else {
3518                 kind[0] = '\0';
3519                 ops = NULL;
3520         }
3521
3522         data = NULL;
3523         if (ops) {
3524                 if (ops->maxtype > RTNL_MAX_TYPE)
3525                         return -EINVAL;
3526
3527                 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3528                         err = nla_parse_nested_deprecated(tbs->attr, ops->maxtype,
3529                                                           linkinfo[IFLA_INFO_DATA],
3530                                                           ops->policy, extack);
3531                         if (err < 0)
3532                                 return err;
3533                         data = tbs->attr;
3534                 }
3535                 if (ops->validate) {
3536                         err = ops->validate(tb, data, extack);
3537                         if (err < 0)
3538                                 return err;
3539                 }
3540         }
3541
3542         slave_data = NULL;
3543         if (m_ops) {
3544                 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3545                         return -EINVAL;
3546
3547                 if (m_ops->slave_maxtype &&
3548                     linkinfo[IFLA_INFO_SLAVE_DATA]) {
3549                         err = nla_parse_nested_deprecated(tbs->slave_attr,
3550                                                           m_ops->slave_maxtype,
3551                                                           linkinfo[IFLA_INFO_SLAVE_DATA],
3552                                                           m_ops->slave_policy,
3553                                                           extack);
3554                         if (err < 0)
3555                                 return err;
3556                         slave_data = tbs->slave_attr;
3557                 }
3558         }
3559
3560         if (dev) {
3561                 int status = 0;
3562
3563                 if (nlh->nlmsg_flags & NLM_F_EXCL)
3564                         return -EEXIST;
3565                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3566                         return -EOPNOTSUPP;
3567
3568                 if (linkinfo[IFLA_INFO_DATA]) {
3569                         if (!ops || ops != dev->rtnl_link_ops ||
3570                             !ops->changelink)
3571                                 return -EOPNOTSUPP;
3572
3573                         err = ops->changelink(dev, tb, data, extack);
3574                         if (err < 0)
3575                                 return err;
3576                         status |= DO_SETLINK_NOTIFY;
3577                 }
3578
3579                 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3580                         if (!m_ops || !m_ops->slave_changelink)
3581                                 return -EOPNOTSUPP;
3582
3583                         err = m_ops->slave_changelink(master_dev, dev, tb,
3584                                                       slave_data, extack);
3585                         if (err < 0)
3586                                 return err;
3587                         status |= DO_SETLINK_NOTIFY;
3588                 }
3589
3590                 return do_setlink(skb, dev, ifm, extack, tb, status);
3591         }
3592
3593         if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3594                 /* No dev found and NLM_F_CREATE not set. Requested dev does not exist,
3595                  * or it's for a group
3596                 */
3597                 if (link_specified)
3598                         return -ENODEV;
3599                 if (tb[IFLA_GROUP])
3600                         return rtnl_group_changelink(skb, net,
3601                                                 nla_get_u32(tb[IFLA_GROUP]),
3602                                                 ifm, extack, tb);
3603                 return -ENODEV;
3604         }
3605
3606         if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3607                 return -EOPNOTSUPP;
3608
3609         if (!ops) {
3610 #ifdef CONFIG_MODULES
3611                 if (kind[0]) {
3612                         __rtnl_unlock();
3613                         request_module("rtnl-link-%s", kind);
3614                         rtnl_lock();
3615                         ops = rtnl_link_ops_get(kind);
3616                         if (ops)
3617                                 goto replay;
3618                 }
3619 #endif
3620                 NL_SET_ERR_MSG(extack, "Unknown device type");
3621                 return -EOPNOTSUPP;
3622         }
3623
3624         return rtnl_newlink_create(skb, ifm, ops, nlh, tb, data, extack);
3625 }
3626
3627 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3628                         struct netlink_ext_ack *extack)
3629 {
3630         struct rtnl_newlink_tbs *tbs;
3631         int ret;
3632
3633         tbs = kmalloc(sizeof(*tbs), GFP_KERNEL);
3634         if (!tbs)
3635                 return -ENOMEM;
3636
3637         ret = __rtnl_newlink(skb, nlh, tbs, extack);
3638         kfree(tbs);
3639         return ret;
3640 }
3641
3642 static int rtnl_valid_getlink_req(struct sk_buff *skb,
3643                                   const struct nlmsghdr *nlh,
3644                                   struct nlattr **tb,
3645                                   struct netlink_ext_ack *extack)
3646 {
3647         struct ifinfomsg *ifm;
3648         int i, err;
3649
3650         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3651                 NL_SET_ERR_MSG(extack, "Invalid header for get link");
3652                 return -EINVAL;
3653         }
3654
3655         if (!netlink_strict_get_check(skb))
3656                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3657                                               ifla_policy, extack);
3658
3659         ifm = nlmsg_data(nlh);
3660         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3661             ifm->ifi_change) {
3662                 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3663                 return -EINVAL;
3664         }
3665
3666         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3667                                             ifla_policy, extack);
3668         if (err)
3669                 return err;
3670
3671         for (i = 0; i <= IFLA_MAX; i++) {
3672                 if (!tb[i])
3673                         continue;
3674
3675                 switch (i) {
3676                 case IFLA_IFNAME:
3677                 case IFLA_ALT_IFNAME:
3678                 case IFLA_EXT_MASK:
3679                 case IFLA_TARGET_NETNSID:
3680                         break;
3681                 default:
3682                         NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3683                         return -EINVAL;
3684                 }
3685         }
3686
3687         return 0;
3688 }
3689
3690 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3691                         struct netlink_ext_ack *extack)
3692 {
3693         struct net *net = sock_net(skb->sk);
3694         struct net *tgt_net = net;
3695         struct ifinfomsg *ifm;
3696         struct nlattr *tb[IFLA_MAX+1];
3697         struct net_device *dev = NULL;
3698         struct sk_buff *nskb;
3699         int netnsid = -1;
3700         int err;
3701         u32 ext_filter_mask = 0;
3702
3703         err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3704         if (err < 0)
3705                 return err;
3706
3707         err = rtnl_ensure_unique_netns(tb, extack, true);
3708         if (err < 0)
3709                 return err;
3710
3711         if (tb[IFLA_TARGET_NETNSID]) {
3712                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3713                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3714                 if (IS_ERR(tgt_net))
3715                         return PTR_ERR(tgt_net);
3716         }
3717
3718         if (tb[IFLA_EXT_MASK])
3719                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3720
3721         err = -EINVAL;
3722         ifm = nlmsg_data(nlh);
3723         if (ifm->ifi_index > 0)
3724                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3725         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3726                 dev = rtnl_dev_get(tgt_net, tb);
3727         else
3728                 goto out;
3729
3730         err = -ENODEV;
3731         if (dev == NULL)
3732                 goto out;
3733
3734         err = -ENOBUFS;
3735         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3736         if (nskb == NULL)
3737                 goto out;
3738
3739         err = rtnl_fill_ifinfo(nskb, dev, net,
3740                                RTM_NEWLINK, NETLINK_CB(skb).portid,
3741                                nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3742                                0, NULL, 0, netnsid, GFP_KERNEL);
3743         if (err < 0) {
3744                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3745                 WARN_ON(err == -EMSGSIZE);
3746                 kfree_skb(nskb);
3747         } else
3748                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3749 out:
3750         if (netnsid >= 0)
3751                 put_net(tgt_net);
3752
3753         return err;
3754 }
3755
3756 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
3757                            bool *changed, struct netlink_ext_ack *extack)
3758 {
3759         char *alt_ifname;
3760         size_t size;
3761         int err;
3762
3763         err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
3764         if (err)
3765                 return err;
3766
3767         if (cmd == RTM_NEWLINKPROP) {
3768                 size = rtnl_prop_list_size(dev);
3769                 size += nla_total_size(ALTIFNAMSIZ);
3770                 if (size >= U16_MAX) {
3771                         NL_SET_ERR_MSG(extack,
3772                                        "effective property list too long");
3773                         return -EINVAL;
3774                 }
3775         }
3776
3777         alt_ifname = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
3778         if (!alt_ifname)
3779                 return -ENOMEM;
3780
3781         if (cmd == RTM_NEWLINKPROP) {
3782                 err = netdev_name_node_alt_create(dev, alt_ifname);
3783                 if (!err)
3784                         alt_ifname = NULL;
3785         } else if (cmd == RTM_DELLINKPROP) {
3786                 err = netdev_name_node_alt_destroy(dev, alt_ifname);
3787         } else {
3788                 WARN_ON_ONCE(1);
3789                 err = -EINVAL;
3790         }
3791
3792         kfree(alt_ifname);
3793         if (!err)
3794                 *changed = true;
3795         return err;
3796 }
3797
3798 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
3799                          struct netlink_ext_ack *extack)
3800 {
3801         struct net *net = sock_net(skb->sk);
3802         struct nlattr *tb[IFLA_MAX + 1];
3803         struct net_device *dev;
3804         struct ifinfomsg *ifm;
3805         bool changed = false;
3806         struct nlattr *attr;
3807         int err, rem;
3808
3809         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3810         if (err)
3811                 return err;
3812
3813         err = rtnl_ensure_unique_netns(tb, extack, true);
3814         if (err)
3815                 return err;
3816
3817         ifm = nlmsg_data(nlh);
3818         if (ifm->ifi_index > 0)
3819                 dev = __dev_get_by_index(net, ifm->ifi_index);
3820         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3821                 dev = rtnl_dev_get(net, tb);
3822         else
3823                 return -EINVAL;
3824
3825         if (!dev)
3826                 return -ENODEV;
3827
3828         if (!tb[IFLA_PROP_LIST])
3829                 return 0;
3830
3831         nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
3832                 switch (nla_type(attr)) {
3833                 case IFLA_ALT_IFNAME:
3834                         err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
3835                         if (err)
3836                                 return err;
3837                         break;
3838                 }
3839         }
3840
3841         if (changed)
3842                 netdev_state_change(dev);
3843         return 0;
3844 }
3845
3846 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3847                             struct netlink_ext_ack *extack)
3848 {
3849         return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
3850 }
3851
3852 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3853                             struct netlink_ext_ack *extack)
3854 {
3855         return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
3856 }
3857
3858 static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3859 {
3860         struct net *net = sock_net(skb->sk);
3861         size_t min_ifinfo_dump_size = 0;
3862         struct nlattr *tb[IFLA_MAX+1];
3863         u32 ext_filter_mask = 0;
3864         struct net_device *dev;
3865         int hdrlen;
3866
3867         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3868         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3869                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3870
3871         if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3872                 if (tb[IFLA_EXT_MASK])
3873                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3874         }
3875
3876         if (!ext_filter_mask)
3877                 return NLMSG_GOODSIZE;
3878         /*
3879          * traverse the list of net devices and compute the minimum
3880          * buffer size based upon the filter mask.
3881          */
3882         rcu_read_lock();
3883         for_each_netdev_rcu(net, dev) {
3884                 min_ifinfo_dump_size = max(min_ifinfo_dump_size,
3885                                            if_nlmsg_size(dev, ext_filter_mask));
3886         }
3887         rcu_read_unlock();
3888
3889         return nlmsg_total_size(min_ifinfo_dump_size);
3890 }
3891
3892 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3893 {
3894         int idx;
3895         int s_idx = cb->family;
3896         int type = cb->nlh->nlmsg_type - RTM_BASE;
3897         int ret = 0;
3898
3899         if (s_idx == 0)
3900                 s_idx = 1;
3901
3902         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3903                 struct rtnl_link __rcu **tab;
3904                 struct rtnl_link *link;
3905                 rtnl_dumpit_func dumpit;
3906
3907                 if (idx < s_idx || idx == PF_PACKET)
3908                         continue;
3909
3910                 if (type < 0 || type >= RTM_NR_MSGTYPES)
3911                         continue;
3912
3913                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3914                 if (!tab)
3915                         continue;
3916
3917                 link = rcu_dereference_rtnl(tab[type]);
3918                 if (!link)
3919                         continue;
3920
3921                 dumpit = link->dumpit;
3922                 if (!dumpit)
3923                         continue;
3924
3925                 if (idx > s_idx) {
3926                         memset(&cb->args[0], 0, sizeof(cb->args));
3927                         cb->prev_seq = 0;
3928                         cb->seq = 0;
3929                 }
3930                 ret = dumpit(skb, cb);
3931                 if (ret)
3932                         break;
3933         }
3934         cb->family = idx;
3935
3936         return skb->len ? : ret;
3937 }
3938
3939 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3940                                        unsigned int change,
3941                                        u32 event, gfp_t flags, int *new_nsid,
3942                                        int new_ifindex, u32 portid, u32 seq)
3943 {
3944         struct net *net = dev_net(dev);
3945         struct sk_buff *skb;
3946         int err = -ENOBUFS;
3947
3948         skb = nlmsg_new(if_nlmsg_size(dev, 0), flags);
3949         if (skb == NULL)
3950                 goto errout;
3951
3952         err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3953                                type, portid, seq, change, 0, 0, event,
3954                                new_nsid, new_ifindex, -1, flags);
3955         if (err < 0) {
3956                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3957                 WARN_ON(err == -EMSGSIZE);
3958                 kfree_skb(skb);
3959                 goto errout;
3960         }
3961         return skb;
3962 errout:
3963         if (err < 0)
3964                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3965         return NULL;
3966 }
3967
3968 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags,
3969                        u32 portid, const struct nlmsghdr *nlh)
3970 {
3971         struct net *net = dev_net(dev);
3972
3973         rtnl_notify(skb, net, portid, RTNLGRP_LINK, nlh, flags);
3974 }
3975
3976 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3977                                unsigned int change, u32 event,
3978                                gfp_t flags, int *new_nsid, int new_ifindex,
3979                                u32 portid, const struct nlmsghdr *nlh)
3980 {
3981         struct sk_buff *skb;
3982
3983         if (dev->reg_state != NETREG_REGISTERED)
3984                 return;
3985
3986         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3987                                      new_ifindex, portid, nlmsg_seq(nlh));
3988         if (skb)
3989                 rtmsg_ifinfo_send(skb, dev, flags, portid, nlh);
3990 }
3991
3992 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3993                   gfp_t flags, u32 portid, const struct nlmsghdr *nlh)
3994 {
3995         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3996                            NULL, 0, portid, nlh);
3997 }
3998
3999 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
4000                          gfp_t flags, int *new_nsid, int new_ifindex)
4001 {
4002         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
4003                            new_nsid, new_ifindex, 0, NULL);
4004 }
4005
4006 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
4007                                    struct net_device *dev,
4008                                    u8 *addr, u16 vid, u32 pid, u32 seq,
4009                                    int type, unsigned int flags,
4010                                    int nlflags, u16 ndm_state)
4011 {
4012         struct nlmsghdr *nlh;
4013         struct ndmsg *ndm;
4014
4015         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
4016         if (!nlh)
4017                 return -EMSGSIZE;
4018
4019         ndm = nlmsg_data(nlh);
4020         ndm->ndm_family  = AF_BRIDGE;
4021         ndm->ndm_pad1    = 0;
4022         ndm->ndm_pad2    = 0;
4023         ndm->ndm_flags   = flags;
4024         ndm->ndm_type    = 0;
4025         ndm->ndm_ifindex = dev->ifindex;
4026         ndm->ndm_state   = ndm_state;
4027
4028         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
4029                 goto nla_put_failure;
4030         if (vid)
4031                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
4032                         goto nla_put_failure;
4033
4034         nlmsg_end(skb, nlh);
4035         return 0;
4036
4037 nla_put_failure:
4038         nlmsg_cancel(skb, nlh);
4039         return -EMSGSIZE;
4040 }
4041
4042 static inline size_t rtnl_fdb_nlmsg_size(void)
4043 {
4044         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
4045                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
4046                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
4047                0;
4048 }
4049
4050 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
4051                             u16 ndm_state)
4052 {
4053         struct net *net = dev_net(dev);
4054         struct sk_buff *skb;
4055         int err = -ENOBUFS;
4056
4057         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
4058         if (!skb)
4059                 goto errout;
4060
4061         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
4062                                       0, 0, type, NTF_SELF, 0, ndm_state);
4063         if (err < 0) {
4064                 kfree_skb(skb);
4065                 goto errout;
4066         }
4067
4068         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
4069         return;
4070 errout:
4071         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
4072 }
4073
4074 /*
4075  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
4076  */
4077 int ndo_dflt_fdb_add(struct ndmsg *ndm,
4078                      struct nlattr *tb[],
4079                      struct net_device *dev,
4080                      const unsigned char *addr, u16 vid,
4081                      u16 flags)
4082 {
4083         int err = -EINVAL;
4084
4085         /* If aging addresses are supported device will need to
4086          * implement its own handler for this.
4087          */
4088         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
4089                 netdev_info(dev, "default FDB implementation only supports local addresses\n");
4090                 return err;
4091         }
4092
4093         if (tb[NDA_FLAGS_EXT]) {
4094                 netdev_info(dev, "invalid flags given to default FDB implementation\n");
4095                 return err;
4096         }
4097
4098         if (vid) {
4099                 netdev_info(dev, "vlans aren't supported yet for dev_uc|mc_add()\n");
4100                 return err;
4101         }
4102
4103         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
4104                 err = dev_uc_add_excl(dev, addr);
4105         else if (is_multicast_ether_addr(addr))
4106                 err = dev_mc_add_excl(dev, addr);
4107
4108         /* Only return duplicate errors if NLM_F_EXCL is set */
4109         if (err == -EEXIST && !(flags & NLM_F_EXCL))
4110                 err = 0;
4111
4112         return err;
4113 }
4114 EXPORT_SYMBOL(ndo_dflt_fdb_add);
4115
4116 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
4117                          struct netlink_ext_ack *extack)
4118 {
4119         u16 vid = 0;
4120
4121         if (vlan_attr) {
4122                 if (nla_len(vlan_attr) != sizeof(u16)) {
4123                         NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
4124                         return -EINVAL;
4125                 }
4126
4127                 vid = nla_get_u16(vlan_attr);
4128
4129                 if (!vid || vid >= VLAN_VID_MASK) {
4130                         NL_SET_ERR_MSG(extack, "invalid vlan id");
4131                         return -EINVAL;
4132                 }
4133         }
4134         *p_vid = vid;
4135         return 0;
4136 }
4137
4138 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
4139                         struct netlink_ext_ack *extack)
4140 {
4141         struct net *net = sock_net(skb->sk);
4142         struct ndmsg *ndm;
4143         struct nlattr *tb[NDA_MAX+1];
4144         struct net_device *dev;
4145         u8 *addr;
4146         u16 vid;
4147         int err;
4148
4149         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
4150                                      extack);
4151         if (err < 0)
4152                 return err;
4153
4154         ndm = nlmsg_data(nlh);
4155         if (ndm->ndm_ifindex == 0) {
4156                 NL_SET_ERR_MSG(extack, "invalid ifindex");
4157                 return -EINVAL;
4158         }
4159
4160         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4161         if (dev == NULL) {
4162                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4163                 return -ENODEV;
4164         }
4165
4166         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4167                 NL_SET_ERR_MSG(extack, "invalid address");
4168                 return -EINVAL;
4169         }
4170
4171         if (dev->type != ARPHRD_ETHER) {
4172                 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
4173                 return -EINVAL;
4174         }
4175
4176         addr = nla_data(tb[NDA_LLADDR]);
4177
4178         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4179         if (err)
4180                 return err;
4181
4182         err = -EOPNOTSUPP;
4183
4184         /* Support fdb on master device the net/bridge default case */
4185         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4186             netif_is_bridge_port(dev)) {
4187                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4188                 const struct net_device_ops *ops = br_dev->netdev_ops;
4189
4190                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
4191                                        nlh->nlmsg_flags, extack);
4192                 if (err)
4193                         goto out;
4194                 else
4195                         ndm->ndm_flags &= ~NTF_MASTER;
4196         }
4197
4198         /* Embedded bridge, macvlan, and any other device support */
4199         if ((ndm->ndm_flags & NTF_SELF)) {
4200                 if (dev->netdev_ops->ndo_fdb_add)
4201                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
4202                                                            vid,
4203                                                            nlh->nlmsg_flags,
4204                                                            extack);
4205                 else
4206                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
4207                                                nlh->nlmsg_flags);
4208
4209                 if (!err) {
4210                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
4211                                         ndm->ndm_state);
4212                         ndm->ndm_flags &= ~NTF_SELF;
4213                 }
4214         }
4215 out:
4216         return err;
4217 }
4218
4219 /*
4220  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
4221  */
4222 int ndo_dflt_fdb_del(struct ndmsg *ndm,
4223                      struct nlattr *tb[],
4224                      struct net_device *dev,
4225                      const unsigned char *addr, u16 vid)
4226 {
4227         int err = -EINVAL;
4228
4229         /* If aging addresses are supported device will need to
4230          * implement its own handler for this.
4231          */
4232         if (!(ndm->ndm_state & NUD_PERMANENT)) {
4233                 netdev_info(dev, "default FDB implementation only supports local addresses\n");
4234                 return err;
4235         }
4236
4237         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
4238                 err = dev_uc_del(dev, addr);
4239         else if (is_multicast_ether_addr(addr))
4240                 err = dev_mc_del(dev, addr);
4241
4242         return err;
4243 }
4244 EXPORT_SYMBOL(ndo_dflt_fdb_del);
4245
4246 static const struct nla_policy fdb_del_bulk_policy[NDA_MAX + 1] = {
4247         [NDA_VLAN]      = { .type = NLA_U16 },
4248         [NDA_IFINDEX]   = NLA_POLICY_MIN(NLA_S32, 1),
4249         [NDA_NDM_STATE_MASK]    = { .type = NLA_U16  },
4250         [NDA_NDM_FLAGS_MASK]    = { .type = NLA_U8 },
4251 };
4252
4253 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
4254                         struct netlink_ext_ack *extack)
4255 {
4256         bool del_bulk = !!(nlh->nlmsg_flags & NLM_F_BULK);
4257         struct net *net = sock_net(skb->sk);
4258         const struct net_device_ops *ops;
4259         struct ndmsg *ndm;
4260         struct nlattr *tb[NDA_MAX+1];
4261         struct net_device *dev;
4262         __u8 *addr = NULL;
4263         int err;
4264         u16 vid;
4265
4266         if (!netlink_capable(skb, CAP_NET_ADMIN))
4267                 return -EPERM;
4268
4269         if (!del_bulk) {
4270                 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX,
4271                                              NULL, extack);
4272         } else {
4273                 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX,
4274                                   fdb_del_bulk_policy, extack);
4275         }
4276         if (err < 0)
4277                 return err;
4278
4279         ndm = nlmsg_data(nlh);
4280         if (ndm->ndm_ifindex == 0) {
4281                 NL_SET_ERR_MSG(extack, "invalid ifindex");
4282                 return -EINVAL;
4283         }
4284
4285         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4286         if (dev == NULL) {
4287                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4288                 return -ENODEV;
4289         }
4290
4291         if (!del_bulk) {
4292                 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4293                         NL_SET_ERR_MSG(extack, "invalid address");
4294                         return -EINVAL;
4295                 }
4296                 addr = nla_data(tb[NDA_LLADDR]);
4297         }
4298
4299         if (dev->type != ARPHRD_ETHER) {
4300                 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
4301                 return -EINVAL;
4302         }
4303
4304         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4305         if (err)
4306                 return err;
4307
4308         err = -EOPNOTSUPP;
4309
4310         /* Support fdb on master device the net/bridge default case */
4311         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4312             netif_is_bridge_port(dev)) {
4313                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4314
4315                 ops = br_dev->netdev_ops;
4316                 if (!del_bulk) {
4317                         if (ops->ndo_fdb_del)
4318                                 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid, extack);
4319                 } else {
4320                         if (ops->ndo_fdb_del_bulk)
4321                                 err = ops->ndo_fdb_del_bulk(ndm, tb, dev, vid,
4322                                                             extack);
4323                 }
4324
4325                 if (err)
4326                         goto out;
4327                 else
4328                         ndm->ndm_flags &= ~NTF_MASTER;
4329         }
4330
4331         /* Embedded bridge, macvlan, and any other device support */
4332         if (ndm->ndm_flags & NTF_SELF) {
4333                 ops = dev->netdev_ops;
4334                 if (!del_bulk) {
4335                         if (ops->ndo_fdb_del)
4336                                 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid, extack);
4337                         else
4338                                 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
4339                 } else {
4340                         /* in case err was cleared by NTF_MASTER call */
4341                         err = -EOPNOTSUPP;
4342                         if (ops->ndo_fdb_del_bulk)
4343                                 err = ops->ndo_fdb_del_bulk(ndm, tb, dev, vid,
4344                                                             extack);
4345                 }
4346
4347                 if (!err) {
4348                         if (!del_bulk)
4349                                 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
4350                                                 ndm->ndm_state);
4351                         ndm->ndm_flags &= ~NTF_SELF;
4352                 }
4353         }
4354 out:
4355         return err;
4356 }
4357
4358 static int nlmsg_populate_fdb(struct sk_buff *skb,
4359                               struct netlink_callback *cb,
4360                               struct net_device *dev,
4361                               int *idx,
4362                               struct netdev_hw_addr_list *list)
4363 {
4364         struct netdev_hw_addr *ha;
4365         int err;
4366         u32 portid, seq;
4367
4368         portid = NETLINK_CB(cb->skb).portid;
4369         seq = cb->nlh->nlmsg_seq;
4370
4371         list_for_each_entry(ha, &list->list, list) {
4372                 if (*idx < cb->args[2])
4373                         goto skip;
4374
4375                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
4376                                               portid, seq,
4377                                               RTM_NEWNEIGH, NTF_SELF,
4378                                               NLM_F_MULTI, NUD_PERMANENT);
4379                 if (err < 0)
4380                         return err;
4381 skip:
4382                 *idx += 1;
4383         }
4384         return 0;
4385 }
4386
4387 /**
4388  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
4389  * @skb: socket buffer to store message in
4390  * @cb: netlink callback
4391  * @dev: netdevice
4392  * @filter_dev: ignored
4393  * @idx: the number of FDB table entries dumped is added to *@idx
4394  *
4395  * Default netdevice operation to dump the existing unicast address list.
4396  * Returns number of addresses from list put in skb.
4397  */
4398 int ndo_dflt_fdb_dump(struct sk_buff *skb,
4399                       struct netlink_callback *cb,
4400                       struct net_device *dev,
4401                       struct net_device *filter_dev,
4402                       int *idx)
4403 {
4404         int err;
4405
4406         if (dev->type != ARPHRD_ETHER)
4407                 return -EINVAL;
4408
4409         netif_addr_lock_bh(dev);
4410         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
4411         if (err)
4412                 goto out;
4413         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
4414 out:
4415         netif_addr_unlock_bh(dev);
4416         return err;
4417 }
4418 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
4419
4420 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
4421                                  int *br_idx, int *brport_idx,
4422                                  struct netlink_ext_ack *extack)
4423 {
4424         struct nlattr *tb[NDA_MAX + 1];
4425         struct ndmsg *ndm;
4426         int err, i;
4427
4428         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4429                 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
4430                 return -EINVAL;
4431         }
4432
4433         ndm = nlmsg_data(nlh);
4434         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4435             ndm->ndm_flags || ndm->ndm_type) {
4436                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
4437                 return -EINVAL;
4438         }
4439
4440         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4441                                             NDA_MAX, NULL, extack);
4442         if (err < 0)
4443                 return err;
4444
4445         *brport_idx = ndm->ndm_ifindex;
4446         for (i = 0; i <= NDA_MAX; ++i) {
4447                 if (!tb[i])
4448                         continue;
4449
4450                 switch (i) {
4451                 case NDA_IFINDEX:
4452                         if (nla_len(tb[i]) != sizeof(u32)) {
4453                                 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
4454                                 return -EINVAL;
4455                         }
4456                         *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
4457                         break;
4458                 case NDA_MASTER:
4459                         if (nla_len(tb[i]) != sizeof(u32)) {
4460                                 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
4461                                 return -EINVAL;
4462                         }
4463                         *br_idx = nla_get_u32(tb[NDA_MASTER]);
4464                         break;
4465                 default:
4466                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
4467                         return -EINVAL;
4468                 }
4469         }
4470
4471         return 0;
4472 }
4473
4474 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
4475                                  int *br_idx, int *brport_idx,
4476                                  struct netlink_ext_ack *extack)
4477 {
4478         struct nlattr *tb[IFLA_MAX+1];
4479         int err;
4480
4481         /* A hack to preserve kernel<->userspace interface.
4482          * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
4483          * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
4484          * So, check for ndmsg with an optional u32 attribute (not used here).
4485          * Fortunately these sizes don't conflict with the size of ifinfomsg
4486          * with an optional attribute.
4487          */
4488         if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
4489             (nlmsg_len(nlh) != sizeof(struct ndmsg) +
4490              nla_attr_size(sizeof(u32)))) {
4491                 struct ifinfomsg *ifm;
4492
4493                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4494                                              tb, IFLA_MAX, ifla_policy,
4495                                              extack);
4496                 if (err < 0) {
4497                         return -EINVAL;
4498                 } else if (err == 0) {
4499                         if (tb[IFLA_MASTER])
4500                                 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
4501                 }
4502
4503                 ifm = nlmsg_data(nlh);
4504                 *brport_idx = ifm->ifi_index;
4505         }
4506         return 0;
4507 }
4508
4509 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
4510 {
4511         struct net_device *dev;
4512         struct net_device *br_dev = NULL;
4513         const struct net_device_ops *ops = NULL;
4514         const struct net_device_ops *cops = NULL;
4515         struct net *net = sock_net(skb->sk);
4516         struct hlist_head *head;
4517         int brport_idx = 0;
4518         int br_idx = 0;
4519         int h, s_h;
4520         int idx = 0, s_idx;
4521         int err = 0;
4522         int fidx = 0;
4523
4524         if (cb->strict_check)
4525                 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4526                                             cb->extack);
4527         else
4528                 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4529                                             cb->extack);
4530         if (err < 0)
4531                 return err;
4532
4533         if (br_idx) {
4534                 br_dev = __dev_get_by_index(net, br_idx);
4535                 if (!br_dev)
4536                         return -ENODEV;
4537
4538                 ops = br_dev->netdev_ops;
4539         }
4540
4541         s_h = cb->args[0];
4542         s_idx = cb->args[1];
4543
4544         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4545                 idx = 0;
4546                 head = &net->dev_index_head[h];
4547                 hlist_for_each_entry(dev, head, index_hlist) {
4548
4549                         if (brport_idx && (dev->ifindex != brport_idx))
4550                                 continue;
4551
4552                         if (!br_idx) { /* user did not specify a specific bridge */
4553                                 if (netif_is_bridge_port(dev)) {
4554                                         br_dev = netdev_master_upper_dev_get(dev);
4555                                         cops = br_dev->netdev_ops;
4556                                 }
4557                         } else {
4558                                 if (dev != br_dev &&
4559                                     !netif_is_bridge_port(dev))
4560                                         continue;
4561
4562                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
4563                                     !netif_is_bridge_master(dev))
4564                                         continue;
4565                                 cops = ops;
4566                         }
4567
4568                         if (idx < s_idx)
4569                                 goto cont;
4570
4571                         if (netif_is_bridge_port(dev)) {
4572                                 if (cops && cops->ndo_fdb_dump) {
4573                                         err = cops->ndo_fdb_dump(skb, cb,
4574                                                                 br_dev, dev,
4575                                                                 &fidx);
4576                                         if (err == -EMSGSIZE)
4577                                                 goto out;
4578                                 }
4579                         }
4580
4581                         if (dev->netdev_ops->ndo_fdb_dump)
4582                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4583                                                                     dev, NULL,
4584                                                                     &fidx);
4585                         else
4586                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4587                                                         &fidx);
4588                         if (err == -EMSGSIZE)
4589                                 goto out;
4590
4591                         cops = NULL;
4592
4593                         /* reset fdb offset to 0 for rest of the interfaces */
4594                         cb->args[2] = 0;
4595                         fidx = 0;
4596 cont:
4597                         idx++;
4598                 }
4599         }
4600
4601 out:
4602         cb->args[0] = h;
4603         cb->args[1] = idx;
4604         cb->args[2] = fidx;
4605
4606         return skb->len;
4607 }
4608
4609 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4610                                 struct nlattr **tb, u8 *ndm_flags,
4611                                 int *br_idx, int *brport_idx, u8 **addr,
4612                                 u16 *vid, struct netlink_ext_ack *extack)
4613 {
4614         struct ndmsg *ndm;
4615         int err, i;
4616
4617         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4618                 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4619                 return -EINVAL;
4620         }
4621
4622         ndm = nlmsg_data(nlh);
4623         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4624             ndm->ndm_type) {
4625                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4626                 return -EINVAL;
4627         }
4628
4629         if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4630                 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4631                 return -EINVAL;
4632         }
4633
4634         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4635                                             NDA_MAX, nda_policy, extack);
4636         if (err < 0)
4637                 return err;
4638
4639         *ndm_flags = ndm->ndm_flags;
4640         *brport_idx = ndm->ndm_ifindex;
4641         for (i = 0; i <= NDA_MAX; ++i) {
4642                 if (!tb[i])
4643                         continue;
4644
4645                 switch (i) {
4646                 case NDA_MASTER:
4647                         *br_idx = nla_get_u32(tb[i]);
4648                         break;
4649                 case NDA_LLADDR:
4650                         if (nla_len(tb[i]) != ETH_ALEN) {
4651                                 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4652                                 return -EINVAL;
4653                         }
4654                         *addr = nla_data(tb[i]);
4655                         break;
4656                 case NDA_VLAN:
4657                         err = fdb_vid_parse(tb[i], vid, extack);
4658                         if (err)
4659                                 return err;
4660                         break;
4661                 case NDA_VNI:
4662                         break;
4663                 default:
4664                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4665                         return -EINVAL;
4666                 }
4667         }
4668
4669         return 0;
4670 }
4671
4672 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4673                         struct netlink_ext_ack *extack)
4674 {
4675         struct net_device *dev = NULL, *br_dev = NULL;
4676         const struct net_device_ops *ops = NULL;
4677         struct net *net = sock_net(in_skb->sk);
4678         struct nlattr *tb[NDA_MAX + 1];
4679         struct sk_buff *skb;
4680         int brport_idx = 0;
4681         u8 ndm_flags = 0;
4682         int br_idx = 0;
4683         u8 *addr = NULL;
4684         u16 vid = 0;
4685         int err;
4686
4687         err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4688                                    &brport_idx, &addr, &vid, extack);
4689         if (err < 0)
4690                 return err;
4691
4692         if (!addr) {
4693                 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4694                 return -EINVAL;
4695         }
4696
4697         if (brport_idx) {
4698                 dev = __dev_get_by_index(net, brport_idx);
4699                 if (!dev) {
4700                         NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4701                         return -ENODEV;
4702                 }
4703         }
4704
4705         if (br_idx) {
4706                 if (dev) {
4707                         NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4708                         return -EINVAL;
4709                 }
4710
4711                 br_dev = __dev_get_by_index(net, br_idx);
4712                 if (!br_dev) {
4713                         NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4714                         return -EINVAL;
4715                 }
4716                 ops = br_dev->netdev_ops;
4717         }
4718
4719         if (dev) {
4720                 if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4721                         if (!netif_is_bridge_port(dev)) {
4722                                 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4723                                 return -EINVAL;
4724                         }
4725                         br_dev = netdev_master_upper_dev_get(dev);
4726                         if (!br_dev) {
4727                                 NL_SET_ERR_MSG(extack, "Master of device not found");
4728                                 return -EINVAL;
4729                         }
4730                         ops = br_dev->netdev_ops;
4731                 } else {
4732                         if (!(ndm_flags & NTF_SELF)) {
4733                                 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4734                                 return -EINVAL;
4735                         }
4736                         ops = dev->netdev_ops;
4737                 }
4738         }
4739
4740         if (!br_dev && !dev) {
4741                 NL_SET_ERR_MSG(extack, "No device specified");
4742                 return -ENODEV;
4743         }
4744
4745         if (!ops || !ops->ndo_fdb_get) {
4746                 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4747                 return -EOPNOTSUPP;
4748         }
4749
4750         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4751         if (!skb)
4752                 return -ENOBUFS;
4753
4754         if (br_dev)
4755                 dev = br_dev;
4756         err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4757                                NETLINK_CB(in_skb).portid,
4758                                nlh->nlmsg_seq, extack);
4759         if (err)
4760                 goto out;
4761
4762         return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4763 out:
4764         kfree_skb(skb);
4765         return err;
4766 }
4767
4768 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4769                                unsigned int attrnum, unsigned int flag)
4770 {
4771         if (mask & flag)
4772                 return nla_put_u8(skb, attrnum, !!(flags & flag));
4773         return 0;
4774 }
4775
4776 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4777                             struct net_device *dev, u16 mode,
4778                             u32 flags, u32 mask, int nlflags,
4779                             u32 filter_mask,
4780                             int (*vlan_fill)(struct sk_buff *skb,
4781                                              struct net_device *dev,
4782                                              u32 filter_mask))
4783 {
4784         struct nlmsghdr *nlh;
4785         struct ifinfomsg *ifm;
4786         struct nlattr *br_afspec;
4787         struct nlattr *protinfo;
4788         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4789         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4790         int err = 0;
4791
4792         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4793         if (nlh == NULL)
4794                 return -EMSGSIZE;
4795
4796         ifm = nlmsg_data(nlh);
4797         ifm->ifi_family = AF_BRIDGE;
4798         ifm->__ifi_pad = 0;
4799         ifm->ifi_type = dev->type;
4800         ifm->ifi_index = dev->ifindex;
4801         ifm->ifi_flags = dev_get_flags(dev);
4802         ifm->ifi_change = 0;
4803
4804
4805         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4806             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4807             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4808             (br_dev &&
4809              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4810             (dev->addr_len &&
4811              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4812             (dev->ifindex != dev_get_iflink(dev) &&
4813              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4814                 goto nla_put_failure;
4815
4816         br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4817         if (!br_afspec)
4818                 goto nla_put_failure;
4819
4820         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4821                 nla_nest_cancel(skb, br_afspec);
4822                 goto nla_put_failure;
4823         }
4824
4825         if (mode != BRIDGE_MODE_UNDEF) {
4826                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4827                         nla_nest_cancel(skb, br_afspec);
4828                         goto nla_put_failure;
4829                 }
4830         }
4831         if (vlan_fill) {
4832                 err = vlan_fill(skb, dev, filter_mask);
4833                 if (err) {
4834                         nla_nest_cancel(skb, br_afspec);
4835                         goto nla_put_failure;
4836                 }
4837         }
4838         nla_nest_end(skb, br_afspec);
4839
4840         protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4841         if (!protinfo)
4842                 goto nla_put_failure;
4843
4844         if (brport_nla_put_flag(skb, flags, mask,
4845                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4846             brport_nla_put_flag(skb, flags, mask,
4847                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4848             brport_nla_put_flag(skb, flags, mask,
4849                                 IFLA_BRPORT_FAST_LEAVE,
4850                                 BR_MULTICAST_FAST_LEAVE) ||
4851             brport_nla_put_flag(skb, flags, mask,
4852                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4853             brport_nla_put_flag(skb, flags, mask,
4854                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4855             brport_nla_put_flag(skb, flags, mask,
4856                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4857             brport_nla_put_flag(skb, flags, mask,
4858                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4859             brport_nla_put_flag(skb, flags, mask,
4860                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP) ||
4861             brport_nla_put_flag(skb, flags, mask,
4862                                 IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) ||
4863             brport_nla_put_flag(skb, flags, mask,
4864                                 IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) {
4865                 nla_nest_cancel(skb, protinfo);
4866                 goto nla_put_failure;
4867         }
4868
4869         nla_nest_end(skb, protinfo);
4870
4871         nlmsg_end(skb, nlh);
4872         return 0;
4873 nla_put_failure:
4874         nlmsg_cancel(skb, nlh);
4875         return err ? err : -EMSGSIZE;
4876 }
4877 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4878
4879 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4880                                     bool strict_check, u32 *filter_mask,
4881                                     struct netlink_ext_ack *extack)
4882 {
4883         struct nlattr *tb[IFLA_MAX+1];
4884         int err, i;
4885
4886         if (strict_check) {
4887                 struct ifinfomsg *ifm;
4888
4889                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4890                         NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4891                         return -EINVAL;
4892                 }
4893
4894                 ifm = nlmsg_data(nlh);
4895                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4896                     ifm->ifi_change || ifm->ifi_index) {
4897                         NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4898                         return -EINVAL;
4899                 }
4900
4901                 err = nlmsg_parse_deprecated_strict(nlh,
4902                                                     sizeof(struct ifinfomsg),
4903                                                     tb, IFLA_MAX, ifla_policy,
4904                                                     extack);
4905         } else {
4906                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4907                                              tb, IFLA_MAX, ifla_policy,
4908                                              extack);
4909         }
4910         if (err < 0)
4911                 return err;
4912
4913         /* new attributes should only be added with strict checking */
4914         for (i = 0; i <= IFLA_MAX; ++i) {
4915                 if (!tb[i])
4916                         continue;
4917
4918                 switch (i) {
4919                 case IFLA_EXT_MASK:
4920                         *filter_mask = nla_get_u32(tb[i]);
4921                         break;
4922                 default:
4923                         if (strict_check) {
4924                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4925                                 return -EINVAL;
4926                         }
4927                 }
4928         }
4929
4930         return 0;
4931 }
4932
4933 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4934 {
4935         const struct nlmsghdr *nlh = cb->nlh;
4936         struct net *net = sock_net(skb->sk);
4937         struct net_device *dev;
4938         int idx = 0;
4939         u32 portid = NETLINK_CB(cb->skb).portid;
4940         u32 seq = nlh->nlmsg_seq;
4941         u32 filter_mask = 0;
4942         int err;
4943
4944         err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4945                                        cb->extack);
4946         if (err < 0 && cb->strict_check)
4947                 return err;
4948
4949         rcu_read_lock();
4950         for_each_netdev_rcu(net, dev) {
4951                 const struct net_device_ops *ops = dev->netdev_ops;
4952                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4953
4954                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4955                         if (idx >= cb->args[0]) {
4956                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
4957                                                 skb, portid, seq, dev,
4958                                                 filter_mask, NLM_F_MULTI);
4959                                 if (err < 0 && err != -EOPNOTSUPP) {
4960                                         if (likely(skb->len))
4961                                                 break;
4962
4963                                         goto out_err;
4964                                 }
4965                         }
4966                         idx++;
4967                 }
4968
4969                 if (ops->ndo_bridge_getlink) {
4970                         if (idx >= cb->args[0]) {
4971                                 err = ops->ndo_bridge_getlink(skb, portid,
4972                                                               seq, dev,
4973                                                               filter_mask,
4974                                                               NLM_F_MULTI);
4975                                 if (err < 0 && err != -EOPNOTSUPP) {
4976                                         if (likely(skb->len))
4977                                                 break;
4978
4979                                         goto out_err;
4980                                 }
4981                         }
4982                         idx++;
4983                 }
4984         }
4985         err = skb->len;
4986 out_err:
4987         rcu_read_unlock();
4988         cb->args[0] = idx;
4989
4990         return err;
4991 }
4992
4993 static inline size_t bridge_nlmsg_size(void)
4994 {
4995         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4996                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
4997                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
4998                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
4999                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
5000                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
5001                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
5002                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
5003                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
5004                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
5005                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
5006 }
5007
5008 static int rtnl_bridge_notify(struct net_device *dev)
5009 {
5010         struct net *net = dev_net(dev);
5011         struct sk_buff *skb;
5012         int err = -EOPNOTSUPP;
5013
5014         if (!dev->netdev_ops->ndo_bridge_getlink)
5015                 return 0;
5016
5017         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
5018         if (!skb) {
5019                 err = -ENOMEM;
5020                 goto errout;
5021         }
5022
5023         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
5024         if (err < 0)
5025                 goto errout;
5026
5027         /* Notification info is only filled for bridge ports, not the bridge
5028          * device itself. Therefore, a zero notification length is valid and
5029          * should not result in an error.
5030          */
5031         if (!skb->len)
5032                 goto errout;
5033
5034         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
5035         return 0;
5036 errout:
5037         WARN_ON(err == -EMSGSIZE);
5038         kfree_skb(skb);
5039         if (err)
5040                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
5041         return err;
5042 }
5043
5044 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
5045                                struct netlink_ext_ack *extack)
5046 {
5047         struct net *net = sock_net(skb->sk);
5048         struct ifinfomsg *ifm;
5049         struct net_device *dev;
5050         struct nlattr *br_spec, *attr = NULL;
5051         int rem, err = -EOPNOTSUPP;
5052         u16 flags = 0;
5053         bool have_flags = false;
5054
5055         if (nlmsg_len(nlh) < sizeof(*ifm))
5056                 return -EINVAL;
5057
5058         ifm = nlmsg_data(nlh);
5059         if (ifm->ifi_family != AF_BRIDGE)
5060                 return -EPFNOSUPPORT;
5061
5062         dev = __dev_get_by_index(net, ifm->ifi_index);
5063         if (!dev) {
5064                 NL_SET_ERR_MSG(extack, "unknown ifindex");
5065                 return -ENODEV;
5066         }
5067
5068         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
5069         if (br_spec) {
5070                 nla_for_each_nested(attr, br_spec, rem) {
5071                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
5072                                 if (nla_len(attr) < sizeof(flags))
5073                                         return -EINVAL;
5074
5075                                 have_flags = true;
5076                                 flags = nla_get_u16(attr);
5077                                 break;
5078                         }
5079                 }
5080         }
5081
5082         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
5083                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
5084
5085                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
5086                         err = -EOPNOTSUPP;
5087                         goto out;
5088                 }
5089
5090                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
5091                                                              extack);
5092                 if (err)
5093                         goto out;
5094
5095                 flags &= ~BRIDGE_FLAGS_MASTER;
5096         }
5097
5098         if ((flags & BRIDGE_FLAGS_SELF)) {
5099                 if (!dev->netdev_ops->ndo_bridge_setlink)
5100                         err = -EOPNOTSUPP;
5101                 else
5102                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
5103                                                                   flags,
5104                                                                   extack);
5105                 if (!err) {
5106                         flags &= ~BRIDGE_FLAGS_SELF;
5107
5108                         /* Generate event to notify upper layer of bridge
5109                          * change
5110                          */
5111                         err = rtnl_bridge_notify(dev);
5112                 }
5113         }
5114
5115         if (have_flags)
5116                 memcpy(nla_data(attr), &flags, sizeof(flags));
5117 out:
5118         return err;
5119 }
5120
5121 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
5122                                struct netlink_ext_ack *extack)
5123 {
5124         struct net *net = sock_net(skb->sk);
5125         struct ifinfomsg *ifm;
5126         struct net_device *dev;
5127         struct nlattr *br_spec, *attr = NULL;
5128         int rem, err = -EOPNOTSUPP;
5129         u16 flags = 0;
5130         bool have_flags = false;
5131
5132         if (nlmsg_len(nlh) < sizeof(*ifm))
5133                 return -EINVAL;
5134
5135         ifm = nlmsg_data(nlh);
5136         if (ifm->ifi_family != AF_BRIDGE)
5137                 return -EPFNOSUPPORT;
5138
5139         dev = __dev_get_by_index(net, ifm->ifi_index);
5140         if (!dev) {
5141                 NL_SET_ERR_MSG(extack, "unknown ifindex");
5142                 return -ENODEV;
5143         }
5144
5145         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
5146         if (br_spec) {
5147                 nla_for_each_nested(attr, br_spec, rem) {
5148                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
5149                                 if (nla_len(attr) < sizeof(flags))
5150                                         return -EINVAL;
5151
5152                                 have_flags = true;
5153                                 flags = nla_get_u16(attr);
5154                                 break;
5155                         }
5156                 }
5157         }
5158
5159         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
5160                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
5161
5162                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
5163                         err = -EOPNOTSUPP;
5164                         goto out;
5165                 }
5166
5167                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
5168                 if (err)
5169                         goto out;
5170
5171                 flags &= ~BRIDGE_FLAGS_MASTER;
5172         }
5173
5174         if ((flags & BRIDGE_FLAGS_SELF)) {
5175                 if (!dev->netdev_ops->ndo_bridge_dellink)
5176                         err = -EOPNOTSUPP;
5177                 else
5178                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
5179                                                                   flags);
5180
5181                 if (!err) {
5182                         flags &= ~BRIDGE_FLAGS_SELF;
5183
5184                         /* Generate event to notify upper layer of bridge
5185                          * change
5186                          */
5187                         err = rtnl_bridge_notify(dev);
5188                 }
5189         }
5190
5191         if (have_flags)
5192                 memcpy(nla_data(attr), &flags, sizeof(flags));
5193 out:
5194         return err;
5195 }
5196
5197 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
5198 {
5199         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
5200                (!idxattr || idxattr == attrid);
5201 }
5202
5203 static bool
5204 rtnl_offload_xstats_have_ndo(const struct net_device *dev, int attr_id)
5205 {
5206         return dev->netdev_ops &&
5207                dev->netdev_ops->ndo_has_offload_stats &&
5208                dev->netdev_ops->ndo_get_offload_stats &&
5209                dev->netdev_ops->ndo_has_offload_stats(dev, attr_id);
5210 }
5211
5212 static unsigned int
5213 rtnl_offload_xstats_get_size_ndo(const struct net_device *dev, int attr_id)
5214 {
5215         return rtnl_offload_xstats_have_ndo(dev, attr_id) ?
5216                sizeof(struct rtnl_link_stats64) : 0;
5217 }
5218
5219 static int
5220 rtnl_offload_xstats_fill_ndo(struct net_device *dev, int attr_id,
5221                              struct sk_buff *skb)
5222 {
5223         unsigned int size = rtnl_offload_xstats_get_size_ndo(dev, attr_id);
5224         struct nlattr *attr = NULL;
5225         void *attr_data;
5226         int err;
5227
5228         if (!size)
5229                 return -ENODATA;
5230
5231         attr = nla_reserve_64bit(skb, attr_id, size,
5232                                  IFLA_OFFLOAD_XSTATS_UNSPEC);
5233         if (!attr)
5234                 return -EMSGSIZE;
5235
5236         attr_data = nla_data(attr);
5237         memset(attr_data, 0, size);
5238
5239         err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, attr_data);
5240         if (err)
5241                 return err;
5242
5243         return 0;
5244 }
5245
5246 static unsigned int
5247 rtnl_offload_xstats_get_size_stats(const struct net_device *dev,
5248                                    enum netdev_offload_xstats_type type)
5249 {
5250         bool enabled = netdev_offload_xstats_enabled(dev, type);
5251
5252         return enabled ? sizeof(struct rtnl_hw_stats64) : 0;
5253 }
5254
5255 struct rtnl_offload_xstats_request_used {
5256         bool request;
5257         bool used;
5258 };
5259
5260 static int
5261 rtnl_offload_xstats_get_stats(struct net_device *dev,
5262                               enum netdev_offload_xstats_type type,
5263                               struct rtnl_offload_xstats_request_used *ru,
5264                               struct rtnl_hw_stats64 *stats,
5265                               struct netlink_ext_ack *extack)
5266 {
5267         bool request;
5268         bool used;
5269         int err;
5270
5271         request = netdev_offload_xstats_enabled(dev, type);
5272         if (!request) {
5273                 used = false;
5274                 goto out;
5275         }
5276
5277         err = netdev_offload_xstats_get(dev, type, stats, &used, extack);
5278         if (err)
5279                 return err;
5280
5281 out:
5282         if (ru) {
5283                 ru->request = request;
5284                 ru->used = used;
5285         }
5286         return 0;
5287 }
5288
5289 static int
5290 rtnl_offload_xstats_fill_hw_s_info_one(struct sk_buff *skb, int attr_id,
5291                                        struct rtnl_offload_xstats_request_used *ru)
5292 {
5293         struct nlattr *nest;
5294
5295         nest = nla_nest_start(skb, attr_id);
5296         if (!nest)
5297                 return -EMSGSIZE;
5298
5299         if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST, ru->request))
5300                 goto nla_put_failure;
5301
5302         if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED, ru->used))
5303                 goto nla_put_failure;
5304
5305         nla_nest_end(skb, nest);
5306         return 0;
5307
5308 nla_put_failure:
5309         nla_nest_cancel(skb, nest);
5310         return -EMSGSIZE;
5311 }
5312
5313 static int
5314 rtnl_offload_xstats_fill_hw_s_info(struct sk_buff *skb, struct net_device *dev,
5315                                    struct netlink_ext_ack *extack)
5316 {
5317         enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5318         struct rtnl_offload_xstats_request_used ru_l3;
5319         struct nlattr *nest;
5320         int err;
5321
5322         err = rtnl_offload_xstats_get_stats(dev, t_l3, &ru_l3, NULL, extack);
5323         if (err)
5324                 return err;
5325
5326         nest = nla_nest_start(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO);
5327         if (!nest)
5328                 return -EMSGSIZE;
5329
5330         if (rtnl_offload_xstats_fill_hw_s_info_one(skb,
5331                                                    IFLA_OFFLOAD_XSTATS_L3_STATS,
5332                                                    &ru_l3))
5333                 goto nla_put_failure;
5334
5335         nla_nest_end(skb, nest);
5336         return 0;
5337
5338 nla_put_failure:
5339         nla_nest_cancel(skb, nest);
5340         return -EMSGSIZE;
5341 }
5342
5343 static int rtnl_offload_xstats_fill(struct sk_buff *skb, struct net_device *dev,
5344                                     int *prividx, u32 off_filter_mask,
5345                                     struct netlink_ext_ack *extack)
5346 {
5347         enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5348         int attr_id_hw_s_info = IFLA_OFFLOAD_XSTATS_HW_S_INFO;
5349         int attr_id_l3_stats = IFLA_OFFLOAD_XSTATS_L3_STATS;
5350         int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT;
5351         bool have_data = false;
5352         int err;
5353
5354         if (*prividx <= attr_id_cpu_hit &&
5355             (off_filter_mask &
5356              IFLA_STATS_FILTER_BIT(attr_id_cpu_hit))) {
5357                 err = rtnl_offload_xstats_fill_ndo(dev, attr_id_cpu_hit, skb);
5358                 if (!err) {
5359                         have_data = true;
5360                 } else if (err != -ENODATA) {
5361                         *prividx = attr_id_cpu_hit;
5362                         return err;
5363                 }
5364         }
5365
5366         if (*prividx <= attr_id_hw_s_info &&
5367             (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_hw_s_info))) {
5368                 *prividx = attr_id_hw_s_info;
5369
5370                 err = rtnl_offload_xstats_fill_hw_s_info(skb, dev, extack);
5371                 if (err)
5372                         return err;
5373
5374                 have_data = true;
5375                 *prividx = 0;
5376         }
5377
5378         if (*prividx <= attr_id_l3_stats &&
5379             (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_l3_stats))) {
5380                 unsigned int size_l3;
5381                 struct nlattr *attr;
5382
5383                 *prividx = attr_id_l3_stats;
5384
5385                 size_l3 = rtnl_offload_xstats_get_size_stats(dev, t_l3);
5386                 if (!size_l3)
5387                         goto skip_l3_stats;
5388                 attr = nla_reserve_64bit(skb, attr_id_l3_stats, size_l3,
5389                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
5390                 if (!attr)
5391                         return -EMSGSIZE;
5392
5393                 err = rtnl_offload_xstats_get_stats(dev, t_l3, NULL,
5394                                                     nla_data(attr), extack);
5395                 if (err)
5396                         return err;
5397
5398                 have_data = true;
5399 skip_l3_stats:
5400                 *prividx = 0;
5401         }
5402
5403         if (!have_data)
5404                 return -ENODATA;
5405
5406         *prividx = 0;
5407         return 0;
5408 }
5409
5410 static unsigned int
5411 rtnl_offload_xstats_get_size_hw_s_info_one(const struct net_device *dev,
5412                                            enum netdev_offload_xstats_type type)
5413 {
5414         bool enabled = netdev_offload_xstats_enabled(dev, type);
5415
5416         return nla_total_size(0) +
5417                 /* IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST */
5418                 nla_total_size(sizeof(u8)) +
5419                 /* IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED */
5420                 (enabled ? nla_total_size(sizeof(u8)) : 0) +
5421                 0;
5422 }
5423
5424 static unsigned int
5425 rtnl_offload_xstats_get_size_hw_s_info(const struct net_device *dev)
5426 {
5427         enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5428
5429         return nla_total_size(0) +
5430                 /* IFLA_OFFLOAD_XSTATS_L3_STATS */
5431                 rtnl_offload_xstats_get_size_hw_s_info_one(dev, t_l3) +
5432                 0;
5433 }
5434
5435 static int rtnl_offload_xstats_get_size(const struct net_device *dev,
5436                                         u32 off_filter_mask)
5437 {
5438         enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5439         int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT;
5440         int nla_size = 0;
5441         int size;
5442
5443         if (off_filter_mask &
5444             IFLA_STATS_FILTER_BIT(attr_id_cpu_hit)) {
5445                 size = rtnl_offload_xstats_get_size_ndo(dev, attr_id_cpu_hit);
5446                 nla_size += nla_total_size_64bit(size);
5447         }
5448
5449         if (off_filter_mask &
5450             IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO))
5451                 nla_size += rtnl_offload_xstats_get_size_hw_s_info(dev);
5452
5453         if (off_filter_mask &
5454             IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_L3_STATS)) {
5455                 size = rtnl_offload_xstats_get_size_stats(dev, t_l3);
5456                 nla_size += nla_total_size_64bit(size);
5457         }
5458
5459         if (nla_size != 0)
5460                 nla_size += nla_total_size(0);
5461
5462         return nla_size;
5463 }
5464
5465 struct rtnl_stats_dump_filters {
5466         /* mask[0] filters outer attributes. Then individual nests have their
5467          * filtering mask at the index of the nested attribute.
5468          */
5469         u32 mask[IFLA_STATS_MAX + 1];
5470 };
5471
5472 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
5473                                int type, u32 pid, u32 seq, u32 change,
5474                                unsigned int flags,
5475                                const struct rtnl_stats_dump_filters *filters,
5476                                int *idxattr, int *prividx,
5477                                struct netlink_ext_ack *extack)
5478 {
5479         unsigned int filter_mask = filters->mask[0];
5480         struct if_stats_msg *ifsm;
5481         struct nlmsghdr *nlh;
5482         struct nlattr *attr;
5483         int s_prividx = *prividx;
5484         int err;
5485
5486         ASSERT_RTNL();
5487
5488         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
5489         if (!nlh)
5490                 return -EMSGSIZE;
5491
5492         ifsm = nlmsg_data(nlh);
5493         ifsm->family = PF_UNSPEC;
5494         ifsm->pad1 = 0;
5495         ifsm->pad2 = 0;
5496         ifsm->ifindex = dev->ifindex;
5497         ifsm->filter_mask = filter_mask;
5498
5499         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
5500                 struct rtnl_link_stats64 *sp;
5501
5502                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
5503                                          sizeof(struct rtnl_link_stats64),
5504                                          IFLA_STATS_UNSPEC);
5505                 if (!attr) {
5506                         err = -EMSGSIZE;
5507                         goto nla_put_failure;
5508                 }
5509
5510                 sp = nla_data(attr);
5511                 dev_get_stats(dev, sp);
5512         }
5513
5514         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
5515                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5516
5517                 if (ops && ops->fill_linkxstats) {
5518                         *idxattr = IFLA_STATS_LINK_XSTATS;
5519                         attr = nla_nest_start_noflag(skb,
5520                                                      IFLA_STATS_LINK_XSTATS);
5521                         if (!attr) {
5522                                 err = -EMSGSIZE;
5523                                 goto nla_put_failure;
5524                         }
5525
5526                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5527                         nla_nest_end(skb, attr);
5528                         if (err)
5529                                 goto nla_put_failure;
5530                         *idxattr = 0;
5531                 }
5532         }
5533
5534         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
5535                              *idxattr)) {
5536                 const struct rtnl_link_ops *ops = NULL;
5537                 const struct net_device *master;
5538
5539                 master = netdev_master_upper_dev_get(dev);
5540                 if (master)
5541                         ops = master->rtnl_link_ops;
5542                 if (ops && ops->fill_linkxstats) {
5543                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
5544                         attr = nla_nest_start_noflag(skb,
5545                                                      IFLA_STATS_LINK_XSTATS_SLAVE);
5546                         if (!attr) {
5547                                 err = -EMSGSIZE;
5548                                 goto nla_put_failure;
5549                         }
5550
5551                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5552                         nla_nest_end(skb, attr);
5553                         if (err)
5554                                 goto nla_put_failure;
5555                         *idxattr = 0;
5556                 }
5557         }
5558
5559         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
5560                              *idxattr)) {
5561                 u32 off_filter_mask;
5562
5563                 off_filter_mask = filters->mask[IFLA_STATS_LINK_OFFLOAD_XSTATS];
5564                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
5565                 attr = nla_nest_start_noflag(skb,
5566                                              IFLA_STATS_LINK_OFFLOAD_XSTATS);
5567                 if (!attr) {
5568                         err = -EMSGSIZE;
5569                         goto nla_put_failure;
5570                 }
5571
5572                 err = rtnl_offload_xstats_fill(skb, dev, prividx,
5573                                                off_filter_mask, extack);
5574                 if (err == -ENODATA)
5575                         nla_nest_cancel(skb, attr);
5576                 else
5577                         nla_nest_end(skb, attr);
5578
5579                 if (err && err != -ENODATA)
5580                         goto nla_put_failure;
5581                 *idxattr = 0;
5582         }
5583
5584         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
5585                 struct rtnl_af_ops *af_ops;
5586
5587                 *idxattr = IFLA_STATS_AF_SPEC;
5588                 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
5589                 if (!attr) {
5590                         err = -EMSGSIZE;
5591                         goto nla_put_failure;
5592                 }
5593
5594                 rcu_read_lock();
5595                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5596                         if (af_ops->fill_stats_af) {
5597                                 struct nlattr *af;
5598
5599                                 af = nla_nest_start_noflag(skb,
5600                                                            af_ops->family);
5601                                 if (!af) {
5602                                         rcu_read_unlock();
5603                                         err = -EMSGSIZE;
5604                                         goto nla_put_failure;
5605                                 }
5606                                 err = af_ops->fill_stats_af(skb, dev);
5607
5608                                 if (err == -ENODATA) {
5609                                         nla_nest_cancel(skb, af);
5610                                 } else if (err < 0) {
5611                                         rcu_read_unlock();
5612                                         goto nla_put_failure;
5613                                 }
5614
5615                                 nla_nest_end(skb, af);
5616                         }
5617                 }
5618                 rcu_read_unlock();
5619
5620                 nla_nest_end(skb, attr);
5621
5622                 *idxattr = 0;
5623         }
5624
5625         nlmsg_end(skb, nlh);
5626
5627         return 0;
5628
5629 nla_put_failure:
5630         /* not a multi message or no progress mean a real error */
5631         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
5632                 nlmsg_cancel(skb, nlh);
5633         else
5634                 nlmsg_end(skb, nlh);
5635
5636         return err;
5637 }
5638
5639 static size_t if_nlmsg_stats_size(const struct net_device *dev,
5640                                   const struct rtnl_stats_dump_filters *filters)
5641 {
5642         size_t size = NLMSG_ALIGN(sizeof(struct if_stats_msg));
5643         unsigned int filter_mask = filters->mask[0];
5644
5645         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
5646                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
5647
5648         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
5649                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5650                 int attr = IFLA_STATS_LINK_XSTATS;
5651
5652                 if (ops && ops->get_linkxstats_size) {
5653                         size += nla_total_size(ops->get_linkxstats_size(dev,
5654                                                                         attr));
5655                         /* for IFLA_STATS_LINK_XSTATS */
5656                         size += nla_total_size(0);
5657                 }
5658         }
5659
5660         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
5661                 struct net_device *_dev = (struct net_device *)dev;
5662                 const struct rtnl_link_ops *ops = NULL;
5663                 const struct net_device *master;
5664
5665                 /* netdev_master_upper_dev_get can't take const */
5666                 master = netdev_master_upper_dev_get(_dev);
5667                 if (master)
5668                         ops = master->rtnl_link_ops;
5669                 if (ops && ops->get_linkxstats_size) {
5670                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
5671
5672                         size += nla_total_size(ops->get_linkxstats_size(dev,
5673                                                                         attr));
5674                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
5675                         size += nla_total_size(0);
5676                 }
5677         }
5678
5679         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) {
5680                 u32 off_filter_mask;
5681
5682                 off_filter_mask = filters->mask[IFLA_STATS_LINK_OFFLOAD_XSTATS];
5683                 size += rtnl_offload_xstats_get_size(dev, off_filter_mask);
5684         }
5685
5686         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
5687                 struct rtnl_af_ops *af_ops;
5688
5689                 /* for IFLA_STATS_AF_SPEC */
5690                 size += nla_total_size(0);
5691
5692                 rcu_read_lock();
5693                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5694                         if (af_ops->get_stats_af_size) {
5695                                 size += nla_total_size(
5696                                         af_ops->get_stats_af_size(dev));
5697
5698                                 /* for AF_* */
5699                                 size += nla_total_size(0);
5700                         }
5701                 }
5702                 rcu_read_unlock();
5703         }
5704
5705         return size;
5706 }
5707
5708 #define RTNL_STATS_OFFLOAD_XSTATS_VALID ((1 << __IFLA_OFFLOAD_XSTATS_MAX) - 1)
5709
5710 static const struct nla_policy
5711 rtnl_stats_get_policy_filters[IFLA_STATS_MAX + 1] = {
5712         [IFLA_STATS_LINK_OFFLOAD_XSTATS] =
5713                     NLA_POLICY_MASK(NLA_U32, RTNL_STATS_OFFLOAD_XSTATS_VALID),
5714 };
5715
5716 static const struct nla_policy
5717 rtnl_stats_get_policy[IFLA_STATS_GETSET_MAX + 1] = {
5718         [IFLA_STATS_GET_FILTERS] =
5719                     NLA_POLICY_NESTED(rtnl_stats_get_policy_filters),
5720 };
5721
5722 static const struct nla_policy
5723 ifla_stats_set_policy[IFLA_STATS_GETSET_MAX + 1] = {
5724         [IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS] = NLA_POLICY_MAX(NLA_U8, 1),
5725 };
5726
5727 static int rtnl_stats_get_parse_filters(struct nlattr *ifla_filters,
5728                                         struct rtnl_stats_dump_filters *filters,
5729                                         struct netlink_ext_ack *extack)
5730 {
5731         struct nlattr *tb[IFLA_STATS_MAX + 1];
5732         int err;
5733         int at;
5734
5735         err = nla_parse_nested(tb, IFLA_STATS_MAX, ifla_filters,
5736                                rtnl_stats_get_policy_filters, extack);
5737         if (err < 0)
5738                 return err;
5739
5740         for (at = 1; at <= IFLA_STATS_MAX; at++) {
5741                 if (tb[at]) {
5742                         if (!(filters->mask[0] & IFLA_STATS_FILTER_BIT(at))) {
5743                                 NL_SET_ERR_MSG(extack, "Filtered attribute not enabled in filter_mask");
5744                                 return -EINVAL;
5745                         }
5746                         filters->mask[at] = nla_get_u32(tb[at]);
5747                 }
5748         }
5749
5750         return 0;
5751 }
5752
5753 static int rtnl_stats_get_parse(const struct nlmsghdr *nlh,
5754                                 u32 filter_mask,
5755                                 struct rtnl_stats_dump_filters *filters,
5756                                 struct netlink_ext_ack *extack)
5757 {
5758         struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1];
5759         int err;
5760         int i;
5761
5762         filters->mask[0] = filter_mask;
5763         for (i = 1; i < ARRAY_SIZE(filters->mask); i++)
5764                 filters->mask[i] = -1U;
5765
5766         err = nlmsg_parse(nlh, sizeof(struct if_stats_msg), tb,
5767                           IFLA_STATS_GETSET_MAX, rtnl_stats_get_policy, extack);
5768         if (err < 0)
5769                 return err;
5770
5771         if (tb[IFLA_STATS_GET_FILTERS]) {
5772                 err = rtnl_stats_get_parse_filters(tb[IFLA_STATS_GET_FILTERS],
5773                                                    filters, extack);
5774                 if (err)
5775                         return err;
5776         }
5777
5778         return 0;
5779 }
5780
5781 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
5782                                 bool is_dump, struct netlink_ext_ack *extack)
5783 {
5784         struct if_stats_msg *ifsm;
5785
5786         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
5787                 NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
5788                 return -EINVAL;
5789         }
5790
5791         if (!strict_check)
5792                 return 0;
5793
5794         ifsm = nlmsg_data(nlh);
5795
5796         /* only requests using strict checks can pass data to influence
5797          * the dump. The legacy exception is filter_mask.
5798          */
5799         if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
5800                 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
5801                 return -EINVAL;
5802         }
5803         if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5804                 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5805                 return -EINVAL;
5806         }
5807
5808         return 0;
5809 }
5810
5811 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5812                           struct netlink_ext_ack *extack)
5813 {
5814         struct rtnl_stats_dump_filters filters;
5815         struct net *net = sock_net(skb->sk);
5816         struct net_device *dev = NULL;
5817         int idxattr = 0, prividx = 0;
5818         struct if_stats_msg *ifsm;
5819         struct sk_buff *nskb;
5820         int err;
5821
5822         err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5823                                    false, extack);
5824         if (err)
5825                 return err;
5826
5827         ifsm = nlmsg_data(nlh);
5828         if (ifsm->ifindex > 0)
5829                 dev = __dev_get_by_index(net, ifsm->ifindex);
5830         else
5831                 return -EINVAL;
5832
5833         if (!dev)
5834                 return -ENODEV;
5835
5836         if (!ifsm->filter_mask) {
5837                 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats get");
5838                 return -EINVAL;
5839         }
5840
5841         err = rtnl_stats_get_parse(nlh, ifsm->filter_mask, &filters, extack);
5842         if (err)
5843                 return err;
5844
5845         nskb = nlmsg_new(if_nlmsg_stats_size(dev, &filters), GFP_KERNEL);
5846         if (!nskb)
5847                 return -ENOBUFS;
5848
5849         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5850                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5851                                   0, &filters, &idxattr, &prividx, extack);
5852         if (err < 0) {
5853                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5854                 WARN_ON(err == -EMSGSIZE);
5855                 kfree_skb(nskb);
5856         } else {
5857                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5858         }
5859
5860         return err;
5861 }
5862
5863 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5864 {
5865         struct netlink_ext_ack *extack = cb->extack;
5866         int h, s_h, err, s_idx, s_idxattr, s_prividx;
5867         struct rtnl_stats_dump_filters filters;
5868         struct net *net = sock_net(skb->sk);
5869         unsigned int flags = NLM_F_MULTI;
5870         struct if_stats_msg *ifsm;
5871         struct hlist_head *head;
5872         struct net_device *dev;
5873         int idx = 0;
5874
5875         s_h = cb->args[0];
5876         s_idx = cb->args[1];
5877         s_idxattr = cb->args[2];
5878         s_prividx = cb->args[3];
5879
5880         cb->seq = net->dev_base_seq;
5881
5882         err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5883         if (err)
5884                 return err;
5885
5886         ifsm = nlmsg_data(cb->nlh);
5887         if (!ifsm->filter_mask) {
5888                 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5889                 return -EINVAL;
5890         }
5891
5892         err = rtnl_stats_get_parse(cb->nlh, ifsm->filter_mask, &filters,
5893                                    extack);
5894         if (err)
5895                 return err;
5896
5897         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5898                 idx = 0;
5899                 head = &net->dev_index_head[h];
5900                 hlist_for_each_entry(dev, head, index_hlist) {
5901                         if (idx < s_idx)
5902                                 goto cont;
5903                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5904                                                   NETLINK_CB(cb->skb).portid,
5905                                                   cb->nlh->nlmsg_seq, 0,
5906                                                   flags, &filters,
5907                                                   &s_idxattr, &s_prividx,
5908                                                   extack);
5909                         /* If we ran out of room on the first message,
5910                          * we're in trouble
5911                          */
5912                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5913
5914                         if (err < 0)
5915                                 goto out;
5916                         s_prividx = 0;
5917                         s_idxattr = 0;
5918                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5919 cont:
5920                         idx++;
5921                 }
5922         }
5923 out:
5924         cb->args[3] = s_prividx;
5925         cb->args[2] = s_idxattr;
5926         cb->args[1] = idx;
5927         cb->args[0] = h;
5928
5929         return skb->len;
5930 }
5931
5932 void rtnl_offload_xstats_notify(struct net_device *dev)
5933 {
5934         struct rtnl_stats_dump_filters response_filters = {};
5935         struct net *net = dev_net(dev);
5936         int idxattr = 0, prividx = 0;
5937         struct sk_buff *skb;
5938         int err = -ENOBUFS;
5939
5940         ASSERT_RTNL();
5941
5942         response_filters.mask[0] |=
5943                 IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_OFFLOAD_XSTATS);
5944         response_filters.mask[IFLA_STATS_LINK_OFFLOAD_XSTATS] |=
5945                 IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO);
5946
5947         skb = nlmsg_new(if_nlmsg_stats_size(dev, &response_filters),
5948                         GFP_KERNEL);
5949         if (!skb)
5950                 goto errout;
5951
5952         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 0, 0, 0, 0,
5953                                   &response_filters, &idxattr, &prividx, NULL);
5954         if (err < 0) {
5955                 kfree_skb(skb);
5956                 goto errout;
5957         }
5958
5959         rtnl_notify(skb, net, 0, RTNLGRP_STATS, NULL, GFP_KERNEL);
5960         return;
5961
5962 errout:
5963         rtnl_set_sk_err(net, RTNLGRP_STATS, err);
5964 }
5965 EXPORT_SYMBOL(rtnl_offload_xstats_notify);
5966
5967 static int rtnl_stats_set(struct sk_buff *skb, struct nlmsghdr *nlh,
5968                           struct netlink_ext_ack *extack)
5969 {
5970         enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5971         struct rtnl_stats_dump_filters response_filters = {};
5972         struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1];
5973         struct net *net = sock_net(skb->sk);
5974         struct net_device *dev = NULL;
5975         struct if_stats_msg *ifsm;
5976         bool notify = false;
5977         int err;
5978
5979         err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5980                                    false, extack);
5981         if (err)
5982                 return err;
5983
5984         ifsm = nlmsg_data(nlh);
5985         if (ifsm->family != AF_UNSPEC) {
5986                 NL_SET_ERR_MSG(extack, "Address family should be AF_UNSPEC");
5987                 return -EINVAL;
5988         }
5989
5990         if (ifsm->ifindex > 0)
5991                 dev = __dev_get_by_index(net, ifsm->ifindex);
5992         else
5993                 return -EINVAL;
5994
5995         if (!dev)
5996                 return -ENODEV;
5997
5998         if (ifsm->filter_mask) {
5999                 NL_SET_ERR_MSG(extack, "Filter mask must be 0 for stats set");
6000                 return -EINVAL;
6001         }
6002
6003         err = nlmsg_parse(nlh, sizeof(*ifsm), tb, IFLA_STATS_GETSET_MAX,
6004                           ifla_stats_set_policy, extack);
6005         if (err < 0)
6006                 return err;
6007
6008         if (tb[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS]) {
6009                 u8 req = nla_get_u8(tb[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS]);
6010
6011                 if (req)
6012                         err = netdev_offload_xstats_enable(dev, t_l3, extack);
6013                 else
6014                         err = netdev_offload_xstats_disable(dev, t_l3);
6015
6016                 if (!err)
6017                         notify = true;
6018                 else if (err != -EALREADY)
6019                         return err;
6020
6021                 response_filters.mask[0] |=
6022                         IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_OFFLOAD_XSTATS);
6023                 response_filters.mask[IFLA_STATS_LINK_OFFLOAD_XSTATS] |=
6024                         IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO);
6025         }
6026
6027         if (notify)
6028                 rtnl_offload_xstats_notify(dev);
6029
6030         return 0;
6031 }
6032
6033 /* Process one rtnetlink message. */
6034
6035 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
6036                              struct netlink_ext_ack *extack)
6037 {
6038         struct net *net = sock_net(skb->sk);
6039         struct rtnl_link *link;
6040         enum rtnl_kinds kind;
6041         struct module *owner;
6042         int err = -EOPNOTSUPP;
6043         rtnl_doit_func doit;
6044         unsigned int flags;
6045         int family;
6046         int type;
6047
6048         type = nlh->nlmsg_type;
6049         if (type > RTM_MAX)
6050                 return -EOPNOTSUPP;
6051
6052         type -= RTM_BASE;
6053
6054         /* All the messages must have at least 1 byte length */
6055         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
6056                 return 0;
6057
6058         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
6059         kind = rtnl_msgtype_kind(type);
6060
6061         if (kind != RTNL_KIND_GET && !netlink_net_capable(skb, CAP_NET_ADMIN))
6062                 return -EPERM;
6063
6064         rcu_read_lock();
6065         if (kind == RTNL_KIND_GET && (nlh->nlmsg_flags & NLM_F_DUMP)) {
6066                 struct sock *rtnl;
6067                 rtnl_dumpit_func dumpit;
6068                 u32 min_dump_alloc = 0;
6069
6070                 link = rtnl_get_link(family, type);
6071                 if (!link || !link->dumpit) {
6072                         family = PF_UNSPEC;
6073                         link = rtnl_get_link(family, type);
6074                         if (!link || !link->dumpit)
6075                                 goto err_unlock;
6076                 }
6077                 owner = link->owner;
6078                 dumpit = link->dumpit;
6079
6080                 if (type == RTM_GETLINK - RTM_BASE)
6081                         min_dump_alloc = rtnl_calcit(skb, nlh);
6082
6083                 err = 0;
6084                 /* need to do this before rcu_read_unlock() */
6085                 if (!try_module_get(owner))
6086                         err = -EPROTONOSUPPORT;
6087
6088                 rcu_read_unlock();
6089
6090                 rtnl = net->rtnl;
6091                 if (err == 0) {
6092                         struct netlink_dump_control c = {
6093                                 .dump           = dumpit,
6094                                 .min_dump_alloc = min_dump_alloc,
6095                                 .module         = owner,
6096                         };
6097                         err = netlink_dump_start(rtnl, skb, nlh, &c);
6098                         /* netlink_dump_start() will keep a reference on
6099                          * module if dump is still in progress.
6100                          */
6101                         module_put(owner);
6102                 }
6103                 return err;
6104         }
6105
6106         link = rtnl_get_link(family, type);
6107         if (!link || !link->doit) {
6108                 family = PF_UNSPEC;
6109                 link = rtnl_get_link(PF_UNSPEC, type);
6110                 if (!link || !link->doit)
6111                         goto out_unlock;
6112         }
6113
6114         owner = link->owner;
6115         if (!try_module_get(owner)) {
6116                 err = -EPROTONOSUPPORT;
6117                 goto out_unlock;
6118         }
6119
6120         flags = link->flags;
6121         if (kind == RTNL_KIND_DEL && (nlh->nlmsg_flags & NLM_F_BULK) &&
6122             !(flags & RTNL_FLAG_BULK_DEL_SUPPORTED)) {
6123                 NL_SET_ERR_MSG(extack, "Bulk delete is not supported");
6124                 module_put(owner);
6125                 goto err_unlock;
6126         }
6127
6128         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
6129                 doit = link->doit;
6130                 rcu_read_unlock();
6131                 if (doit)
6132                         err = doit(skb, nlh, extack);
6133                 module_put(owner);
6134                 return err;
6135         }
6136         rcu_read_unlock();
6137
6138         rtnl_lock();
6139         link = rtnl_get_link(family, type);
6140         if (link && link->doit)
6141                 err = link->doit(skb, nlh, extack);
6142         rtnl_unlock();
6143
6144         module_put(owner);
6145
6146         return err;
6147
6148 out_unlock:
6149         rcu_read_unlock();
6150         return err;
6151
6152 err_unlock:
6153         rcu_read_unlock();
6154         return -EOPNOTSUPP;
6155 }
6156
6157 static void rtnetlink_rcv(struct sk_buff *skb)
6158 {
6159         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
6160 }
6161
6162 static int rtnetlink_bind(struct net *net, int group)
6163 {
6164         switch (group) {
6165         case RTNLGRP_IPV4_MROUTE_R:
6166         case RTNLGRP_IPV6_MROUTE_R:
6167                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
6168                         return -EPERM;
6169                 break;
6170         }
6171         return 0;
6172 }
6173
6174 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
6175 {
6176         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6177
6178         switch (event) {
6179         case NETDEV_REBOOT:
6180         case NETDEV_CHANGEMTU:
6181         case NETDEV_CHANGEADDR:
6182         case NETDEV_CHANGENAME:
6183         case NETDEV_FEAT_CHANGE:
6184         case NETDEV_BONDING_FAILOVER:
6185         case NETDEV_POST_TYPE_CHANGE:
6186         case NETDEV_NOTIFY_PEERS:
6187         case NETDEV_CHANGEUPPER:
6188         case NETDEV_RESEND_IGMP:
6189         case NETDEV_CHANGEINFODATA:
6190         case NETDEV_CHANGELOWERSTATE:
6191         case NETDEV_CHANGE_TX_QUEUE_LEN:
6192                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
6193                                    GFP_KERNEL, NULL, 0, 0, NULL);
6194                 break;
6195         default:
6196                 break;
6197         }
6198         return NOTIFY_DONE;
6199 }
6200
6201 static struct notifier_block rtnetlink_dev_notifier = {
6202         .notifier_call  = rtnetlink_event,
6203 };
6204
6205
6206 static int __net_init rtnetlink_net_init(struct net *net)
6207 {
6208         struct sock *sk;
6209         struct netlink_kernel_cfg cfg = {
6210                 .groups         = RTNLGRP_MAX,
6211                 .input          = rtnetlink_rcv,
6212                 .cb_mutex       = &rtnl_mutex,
6213                 .flags          = NL_CFG_F_NONROOT_RECV,
6214                 .bind           = rtnetlink_bind,
6215         };
6216
6217         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
6218         if (!sk)
6219                 return -ENOMEM;
6220         net->rtnl = sk;
6221         return 0;
6222 }
6223
6224 static void __net_exit rtnetlink_net_exit(struct net *net)
6225 {
6226         netlink_kernel_release(net->rtnl);
6227         net->rtnl = NULL;
6228 }
6229
6230 static struct pernet_operations rtnetlink_net_ops = {
6231         .init = rtnetlink_net_init,
6232         .exit = rtnetlink_net_exit,
6233 };
6234
6235 void __init rtnetlink_init(void)
6236 {
6237         if (register_pernet_subsys(&rtnetlink_net_ops))
6238                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
6239
6240         register_netdevice_notifier(&rtnetlink_dev_notifier);
6241
6242         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
6243                       rtnl_dump_ifinfo, 0);
6244         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
6245         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
6246         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
6247
6248         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
6249         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
6250         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
6251
6252         rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
6253         rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
6254
6255         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
6256         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL,
6257                       RTNL_FLAG_BULK_DEL_SUPPORTED);
6258         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
6259
6260         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
6261         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
6262         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
6263
6264         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
6265                       0);
6266         rtnl_register(PF_UNSPEC, RTM_SETSTATS, rtnl_stats_set, NULL, 0);
6267 }