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