net/core/rtnetlink.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4  *              operating system.  INET is implemented using the  BSD Socket
   5  *              interface as the means of communication with the user level.
   6  *
   7  *              Routing netlink socket interface: protocol independent part.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  *      Fixes:
  12  *      Vitaly E. Lavrov                RTA_OK 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         struct ifla_vf_guid node_guid;
1222         struct ifla_vf_guid port_guid;
1223
1224         memset(&ivi, 0, sizeof(ivi));
1225
1226         /* Not all SR-IOV capable drivers support the
1227          * spoofcheck and "RSS query enable" query.  Preset to
1228          * -1 so the user space tool can detect that the driver
1229          * didn't report anything.
1230          */
1231         ivi.spoofchk = -1;
1232         ivi.rss_query_en = -1;
1233         ivi.trusted = -1;
1234         /* The default value for VF link state is "auto"
1235          * IFLA_VF_LINK_STATE_AUTO which equals zero
1236          */
1237         ivi.linkstate = 0;
1238         /* VLAN Protocol by default is 802.1Q */
1239         ivi.vlan_proto = htons(ETH_P_8021Q);
1240         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1241                 return 0;
1242
1243         memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1244
1245         vf_mac.vf =
1246                 vf_vlan.vf =
1247                 vf_vlan_info.vf =
1248                 vf_rate.vf =
1249                 vf_tx_rate.vf =
1250                 vf_spoofchk.vf =
1251                 vf_linkstate.vf =
1252                 vf_rss_query_en.vf =
1253                 vf_trust.vf =
1254                 node_guid.vf =
1255                 port_guid.vf = ivi.vf;
1256
1257         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1258         memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
1259         vf_vlan.vlan = ivi.vlan;
1260         vf_vlan.qos = ivi.qos;
1261         vf_vlan_info.vlan = ivi.vlan;
1262         vf_vlan_info.qos = ivi.qos;
1263         vf_vlan_info.vlan_proto = ivi.vlan_proto;
1264         vf_tx_rate.rate = ivi.max_tx_rate;
1265         vf_rate.min_tx_rate = ivi.min_tx_rate;
1266         vf_rate.max_tx_rate = ivi.max_tx_rate;
1267         vf_spoofchk.setting = ivi.spoofchk;
1268         vf_linkstate.link_state = ivi.linkstate;
1269         vf_rss_query_en.setting = ivi.rss_query_en;
1270         vf_trust.setting = ivi.trusted;
1271         vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1272         if (!vf)
1273                 goto nla_put_vfinfo_failure;
1274         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1275             nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
1276             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1277             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1278                     &vf_rate) ||
1279             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1280                     &vf_tx_rate) ||
1281             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1282                     &vf_spoofchk) ||
1283             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1284                     &vf_linkstate) ||
1285             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1286                     sizeof(vf_rss_query_en),
1287                     &vf_rss_query_en) ||
1288             nla_put(skb, IFLA_VF_TRUST,
1289                     sizeof(vf_trust), &vf_trust))
1290                 goto nla_put_vf_failure;
1291
1292         memset(&node_guid, 0, sizeof(node_guid));
1293         memset(&port_guid, 0, sizeof(port_guid));
1294         if (dev->netdev_ops->ndo_get_vf_guid &&
1295             !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
1296                                               &port_guid)) {
1297                 if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
1298                             &node_guid) ||
1299                     nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
1300                             &port_guid))
1301                         goto nla_put_vf_failure;
1302         }
1303         vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1304         if (!vfvlanlist)
1305                 goto nla_put_vf_failure;
1306         if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1307                     &vf_vlan_info)) {
1308                 nla_nest_cancel(skb, vfvlanlist);
1309                 goto nla_put_vf_failure;
1310         }
1311         nla_nest_end(skb, vfvlanlist);
1312         memset(&vf_stats, 0, sizeof(vf_stats));
1313         if (dev->netdev_ops->ndo_get_vf_stats)
1314                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1315                                                 &vf_stats);
1316         vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1317         if (!vfstats)
1318                 goto nla_put_vf_failure;
1319         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1320                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1321             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1322                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1323             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1324                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1325             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1326                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1327             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1328                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1329             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1330                               vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1331             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1332                               vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1333             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1334                               vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1335                 nla_nest_cancel(skb, vfstats);
1336                 goto nla_put_vf_failure;
1337         }
1338         nla_nest_end(skb, vfstats);
1339         nla_nest_end(skb, vf);
1340         return 0;
1341
1342 nla_put_vf_failure:
1343         nla_nest_cancel(skb, vf);
1344 nla_put_vfinfo_failure:
1345         nla_nest_cancel(skb, vfinfo);
1346         return -EMSGSIZE;
1347 }
1348
1349 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1350                                            struct net_device *dev,
1351                                            u32 ext_filter_mask)
1352 {
1353         struct nlattr *vfinfo;
1354         int i, num_vfs;
1355
1356         if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1357                 return 0;
1358
1359         num_vfs = dev_num_vf(dev->dev.parent);
1360         if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1361                 return -EMSGSIZE;
1362
1363         if (!dev->netdev_ops->ndo_get_vf_config)
1364                 return 0;
1365
1366         vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1367         if (!vfinfo)
1368                 return -EMSGSIZE;
1369
1370         for (i = 0; i < num_vfs; i++) {
1371                 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1372                         return -EMSGSIZE;
1373         }
1374
1375         nla_nest_end(skb, vfinfo);
1376         return 0;
1377 }
1378
1379 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1380 {
1381         struct rtnl_link_ifmap map;
1382
1383         memset(&map, 0, sizeof(map));
1384         map.mem_start   = dev->mem_start;
1385         map.mem_end     = dev->mem_end;
1386         map.base_addr   = dev->base_addr;
1387         map.irq         = dev->irq;
1388         map.dma         = dev->dma;
1389         map.port        = dev->if_port;
1390
1391         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1392                 return -EMSGSIZE;
1393
1394         return 0;
1395 }
1396
1397 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1398 {
1399         const struct bpf_prog *generic_xdp_prog;
1400
1401         ASSERT_RTNL();
1402
1403         generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1404         if (!generic_xdp_prog)
1405                 return 0;
1406         return generic_xdp_prog->aux->id;
1407 }
1408
1409 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1410 {
1411         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf, XDP_QUERY_PROG);
1412 }
1413
1414 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1415 {
1416         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf,
1417                                XDP_QUERY_PROG_HW);
1418 }
1419
1420 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1421                                u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1422                                u32 (*get_prog_id)(struct net_device *dev))
1423 {
1424         u32 curr_id;
1425         int err;
1426
1427         curr_id = get_prog_id(dev);
1428         if (!curr_id)
1429                 return 0;
1430
1431         *prog_id = curr_id;
1432         err = nla_put_u32(skb, attr, curr_id);
1433         if (err)
1434                 return err;
1435
1436         if (*mode != XDP_ATTACHED_NONE)
1437                 *mode = XDP_ATTACHED_MULTI;
1438         else
1439                 *mode = tgt_mode;
1440
1441         return 0;
1442 }
1443
1444 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1445 {
1446         struct nlattr *xdp;
1447         u32 prog_id;
1448         int err;
1449         u8 mode;
1450
1451         xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1452         if (!xdp)
1453                 return -EMSGSIZE;
1454
1455         prog_id = 0;
1456         mode = XDP_ATTACHED_NONE;
1457         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1458                                   IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1459         if (err)
1460                 goto err_cancel;
1461         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1462                                   IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1463         if (err)
1464                 goto err_cancel;
1465         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1466                                   IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1467         if (err)
1468                 goto err_cancel;
1469
1470         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1471         if (err)
1472                 goto err_cancel;
1473
1474         if (prog_id && mode != XDP_ATTACHED_MULTI) {
1475                 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1476                 if (err)
1477                         goto err_cancel;
1478         }
1479
1480         nla_nest_end(skb, xdp);
1481         return 0;
1482
1483 err_cancel:
1484         nla_nest_cancel(skb, xdp);
1485         return err;
1486 }
1487
1488 static u32 rtnl_get_event(unsigned long event)
1489 {
1490         u32 rtnl_event_type = IFLA_EVENT_NONE;
1491
1492         switch (event) {
1493         case NETDEV_REBOOT:
1494                 rtnl_event_type = IFLA_EVENT_REBOOT;
1495                 break;
1496         case NETDEV_FEAT_CHANGE:
1497                 rtnl_event_type = IFLA_EVENT_FEATURES;
1498                 break;
1499         case NETDEV_BONDING_FAILOVER:
1500                 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1501                 break;
1502         case NETDEV_NOTIFY_PEERS:
1503                 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1504                 break;
1505         case NETDEV_RESEND_IGMP:
1506                 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1507                 break;
1508         case NETDEV_CHANGEINFODATA:
1509                 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1510                 break;
1511         default:
1512                 break;
1513         }
1514
1515         return rtnl_event_type;
1516 }
1517
1518 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1519 {
1520         const struct net_device *upper_dev;
1521         int ret = 0;
1522
1523         rcu_read_lock();
1524
1525         upper_dev = netdev_master_upper_dev_get_rcu(dev);
1526         if (upper_dev)
1527                 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1528
1529         rcu_read_unlock();
1530         return ret;
1531 }
1532
1533 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1534                           bool force)
1535 {
1536         int ifindex = dev_get_iflink(dev);
1537
1538         if (force || dev->ifindex != ifindex)
1539                 return nla_put_u32(skb, IFLA_LINK, ifindex);
1540
1541         return 0;
1542 }
1543
1544 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1545                                               struct net_device *dev)
1546 {
1547         char buf[IFALIASZ];
1548         int ret;
1549
1550         ret = dev_get_alias(dev, buf, sizeof(buf));
1551         return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1552 }
1553
1554 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1555                                   const struct net_device *dev,
1556                                   struct net *src_net, gfp_t gfp)
1557 {
1558         bool put_iflink = false;
1559
1560         if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1561                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1562
1563                 if (!net_eq(dev_net(dev), link_net)) {
1564                         int id = peernet2id_alloc(src_net, link_net, gfp);
1565
1566                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1567                                 return -EMSGSIZE;
1568
1569                         put_iflink = true;
1570                 }
1571         }
1572
1573         return nla_put_iflink(skb, dev, put_iflink);
1574 }
1575
1576 static int rtnl_fill_link_af(struct sk_buff *skb,
1577                              const struct net_device *dev,
1578                              u32 ext_filter_mask)
1579 {
1580         const struct rtnl_af_ops *af_ops;
1581         struct nlattr *af_spec;
1582
1583         af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1584         if (!af_spec)
1585                 return -EMSGSIZE;
1586
1587         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1588                 struct nlattr *af;
1589                 int err;
1590
1591                 if (!af_ops->fill_link_af)
1592                         continue;
1593
1594                 af = nla_nest_start_noflag(skb, af_ops->family);
1595                 if (!af)
1596                         return -EMSGSIZE;
1597
1598                 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1599                 /*
1600                  * Caller may return ENODATA to indicate that there
1601                  * was no data to be dumped. This is not an error, it
1602                  * means we should trim the attribute header and
1603                  * continue.
1604                  */
1605                 if (err == -ENODATA)
1606                         nla_nest_cancel(skb, af);
1607                 else if (err < 0)
1608                         return -EMSGSIZE;
1609
1610                 nla_nest_end(skb, af);
1611         }
1612
1613         nla_nest_end(skb, af_spec);
1614         return 0;
1615 }
1616
1617 static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
1618                                  const struct net_device *dev)
1619 {
1620         struct netdev_name_node *name_node;
1621         int count = 0;
1622
1623         list_for_each_entry(name_node, &dev->name_node->list, list) {
1624                 if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
1625                         return -EMSGSIZE;
1626                 count++;
1627         }
1628         return count;
1629 }
1630
1631 static int rtnl_fill_prop_list(struct sk_buff *skb,
1632                                const struct net_device *dev)
1633 {
1634         struct nlattr *prop_list;
1635         int ret;
1636
1637         prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
1638         if (!prop_list)
1639                 return -EMSGSIZE;
1640
1641         ret = rtnl_fill_alt_ifnames(skb, dev);
1642         if (ret <= 0)
1643                 goto nest_cancel;
1644
1645         nla_nest_end(skb, prop_list);
1646         return 0;
1647
1648 nest_cancel:
1649         nla_nest_cancel(skb, prop_list);
1650         return ret;
1651 }
1652
1653 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1654                             struct net_device *dev, struct net *src_net,
1655                             int type, u32 pid, u32 seq, u32 change,
1656                             unsigned int flags, u32 ext_filter_mask,
1657                             u32 event, int *new_nsid, int new_ifindex,
1658                             int tgt_netnsid, gfp_t gfp)
1659 {
1660         struct ifinfomsg *ifm;
1661         struct nlmsghdr *nlh;
1662
1663         ASSERT_RTNL();
1664         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1665         if (nlh == NULL)
1666                 return -EMSGSIZE;
1667
1668         ifm = nlmsg_data(nlh);
1669         ifm->ifi_family = AF_UNSPEC;
1670         ifm->__ifi_pad = 0;
1671         ifm->ifi_type = dev->type;
1672         ifm->ifi_index = dev->ifindex;
1673         ifm->ifi_flags = dev_get_flags(dev);
1674         ifm->ifi_change = change;
1675
1676         if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1677                 goto nla_put_failure;
1678
1679         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1680             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1681             nla_put_u8(skb, IFLA_OPERSTATE,
1682                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1683             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1684             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1685             nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1686             nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1687             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1688             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1689             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1690             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1691             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1692 #ifdef CONFIG_RPS
1693             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1694 #endif
1695             put_master_ifindex(skb, dev) ||
1696             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1697             (dev->qdisc &&
1698              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1699             nla_put_ifalias(skb, dev) ||
1700             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1701                         atomic_read(&dev->carrier_up_count) +
1702                         atomic_read(&dev->carrier_down_count)) ||
1703             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down) ||
1704             nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1705                         atomic_read(&dev->carrier_up_count)) ||
1706             nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1707                         atomic_read(&dev->carrier_down_count)))
1708                 goto nla_put_failure;
1709
1710         if (event != IFLA_EVENT_NONE) {
1711                 if (nla_put_u32(skb, IFLA_EVENT, event))
1712                         goto nla_put_failure;
1713         }
1714
1715         if (rtnl_fill_link_ifmap(skb, dev))
1716                 goto nla_put_failure;
1717
1718         if (dev->addr_len) {
1719                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1720                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1721                         goto nla_put_failure;
1722         }
1723
1724         if (rtnl_phys_port_id_fill(skb, dev))
1725                 goto nla_put_failure;
1726
1727         if (rtnl_phys_port_name_fill(skb, dev))
1728                 goto nla_put_failure;
1729
1730         if (rtnl_phys_switch_id_fill(skb, dev))
1731                 goto nla_put_failure;
1732
1733         if (rtnl_fill_stats(skb, dev))
1734                 goto nla_put_failure;
1735
1736         if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1737                 goto nla_put_failure;
1738
1739         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1740                 goto nla_put_failure;
1741
1742         if (rtnl_xdp_fill(skb, dev))
1743                 goto nla_put_failure;
1744
1745         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1746                 if (rtnl_link_fill(skb, dev) < 0)
1747                         goto nla_put_failure;
1748         }
1749
1750         if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1751                 goto nla_put_failure;
1752
1753         if (new_nsid &&
1754             nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1755                 goto nla_put_failure;
1756         if (new_ifindex &&
1757             nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1758                 goto nla_put_failure;
1759
1760
1761         rcu_read_lock();
1762         if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1763                 goto nla_put_failure_rcu;
1764         rcu_read_unlock();
1765
1766         if (rtnl_fill_prop_list(skb, dev))
1767                 goto nla_put_failure;
1768
1769         nlmsg_end(skb, nlh);
1770         return 0;
1771
1772 nla_put_failure_rcu:
1773         rcu_read_unlock();
1774 nla_put_failure:
1775         nlmsg_cancel(skb, nlh);
1776         return -EMSGSIZE;
1777 }
1778
1779 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1780         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1781         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1782         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1783         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1784         [IFLA_MTU]              = { .type = NLA_U32 },
1785         [IFLA_LINK]             = { .type = NLA_U32 },
1786         [IFLA_MASTER]           = { .type = NLA_U32 },
1787         [IFLA_CARRIER]          = { .type = NLA_U8 },
1788         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1789         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1790         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1791         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1792         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1793         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1794         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1795         /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1796          * allow 0-length string (needed to remove an alias).
1797          */
1798         [IFLA_IFALIAS]          = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1799         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1800         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1801         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1802         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1803         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1804         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1805         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1806         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1807         [IFLA_GSO_MAX_SEGS]     = { .type = NLA_U32 },
1808         [IFLA_GSO_MAX_SIZE]     = { .type = NLA_U32 },
1809         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1810         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1811         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1812         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1813         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1814         [IFLA_XDP]              = { .type = NLA_NESTED },
1815         [IFLA_EVENT]            = { .type = NLA_U32 },
1816         [IFLA_GROUP]            = { .type = NLA_U32 },
1817         [IFLA_TARGET_NETNSID]   = { .type = NLA_S32 },
1818         [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1819         [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1820         [IFLA_MIN_MTU]          = { .type = NLA_U32 },
1821         [IFLA_MAX_MTU]          = { .type = NLA_U32 },
1822         [IFLA_PROP_LIST]        = { .type = NLA_NESTED },
1823         [IFLA_ALT_IFNAME]       = { .type = NLA_STRING,
1824                                     .len = ALTIFNAMSIZ - 1 },
1825 };
1826
1827 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1828         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1829         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1830         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1831         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1832 };
1833
1834 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1835         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1836         [IFLA_VF_BROADCAST]     = { .type = NLA_REJECT },
1837         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1838         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1839         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1840         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1841         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1842         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1843         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1844         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1845         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1846         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1847         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1848 };
1849
1850 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1851         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1852         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1853                                     .len = PORT_PROFILE_MAX },
1854         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1855                                       .len = PORT_UUID_MAX },
1856         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1857                                     .len = PORT_UUID_MAX },
1858         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1859         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1860
1861         /* Unused, but we need to keep it here since user space could
1862          * fill it. It's also broken with regard to NLA_BINARY use in
1863          * combination with structs.
1864          */
1865         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1866                                     .len = sizeof(struct ifla_port_vsi) },
1867 };
1868
1869 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1870         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1871         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1872         [IFLA_XDP_FLAGS]        = { .type = NLA_U32 },
1873         [IFLA_XDP_PROG_ID]      = { .type = NLA_U32 },
1874 };
1875
1876 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1877 {
1878         const struct rtnl_link_ops *ops = NULL;
1879         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1880
1881         if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
1882                 return NULL;
1883
1884         if (linfo[IFLA_INFO_KIND]) {
1885                 char kind[MODULE_NAME_LEN];
1886
1887                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1888                 ops = rtnl_link_ops_get(kind);
1889         }
1890
1891         return ops;
1892 }
1893
1894 static bool link_master_filtered(struct net_device *dev, int master_idx)
1895 {
1896         struct net_device *master;
1897
1898         if (!master_idx)
1899                 return false;
1900
1901         master = netdev_master_upper_dev_get(dev);
1902         if (!master || master->ifindex != master_idx)
1903                 return true;
1904
1905         return false;
1906 }
1907
1908 static bool link_kind_filtered(const struct net_device *dev,
1909                                const struct rtnl_link_ops *kind_ops)
1910 {
1911         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1912                 return true;
1913
1914         return false;
1915 }
1916
1917 static bool link_dump_filtered(struct net_device *dev,
1918                                int master_idx,
1919                                const struct rtnl_link_ops *kind_ops)
1920 {
1921         if (link_master_filtered(dev, master_idx) ||
1922             link_kind_filtered(dev, kind_ops))
1923                 return true;
1924
1925         return false;
1926 }
1927
1928 /**
1929  * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
1930  * @sk: netlink socket
1931  * @netnsid: network namespace identifier
1932  *
1933  * Returns the network namespace identified by netnsid on success or an error
1934  * pointer on failure.
1935  */
1936 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
1937 {
1938         struct net *net;
1939
1940         net = get_net_ns_by_id(sock_net(sk), netnsid);
1941         if (!net)
1942                 return ERR_PTR(-EINVAL);
1943
1944         /* For now, the caller is required to have CAP_NET_ADMIN in
1945          * the user namespace owning the target net ns.
1946          */
1947         if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
1948                 put_net(net);
1949                 return ERR_PTR(-EACCES);
1950         }
1951         return net;
1952 }
1953 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
1954
1955 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
1956                                       bool strict_check, struct nlattr **tb,
1957                                       struct netlink_ext_ack *extack)
1958 {
1959         int hdrlen;
1960
1961         if (strict_check) {
1962                 struct ifinfomsg *ifm;
1963
1964                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1965                         NL_SET_ERR_MSG(extack, "Invalid header for link dump");
1966                         return -EINVAL;
1967                 }
1968
1969                 ifm = nlmsg_data(nlh);
1970                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
1971                     ifm->ifi_change) {
1972                         NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
1973                         return -EINVAL;
1974                 }
1975                 if (ifm->ifi_index) {
1976                         NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
1977                         return -EINVAL;
1978                 }
1979
1980                 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
1981                                                      IFLA_MAX, ifla_policy,
1982                                                      extack);
1983         }
1984
1985         /* A hack to preserve kernel<->userspace interface.
1986          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1987          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1988          * what iproute2 < v3.9.0 used.
1989          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1990          * attribute, its netlink message is shorter than struct ifinfomsg.
1991          */
1992         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
1993                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1994
1995         return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
1996                                       extack);
1997 }
1998
1999 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2000 {
2001         struct netlink_ext_ack *extack = cb->extack;
2002         const struct nlmsghdr *nlh = cb->nlh;
2003         struct net *net = sock_net(skb->sk);
2004         struct net *tgt_net = net;
2005         int h, s_h;
2006         int idx = 0, s_idx;
2007         struct net_device *dev;
2008         struct hlist_head *head;
2009         struct nlattr *tb[IFLA_MAX+1];
2010         u32 ext_filter_mask = 0;
2011         const struct rtnl_link_ops *kind_ops = NULL;
2012         unsigned int flags = NLM_F_MULTI;
2013         int master_idx = 0;
2014         int netnsid = -1;
2015         int err, i;
2016
2017         s_h = cb->args[0];
2018         s_idx = cb->args[1];
2019
2020         err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
2021         if (err < 0) {
2022                 if (cb->strict_check)
2023                         return err;
2024
2025                 goto walk_entries;
2026         }
2027
2028         for (i = 0; i <= IFLA_MAX; ++i) {
2029                 if (!tb[i])
2030                         continue;
2031
2032                 /* new attributes should only be added with strict checking */
2033                 switch (i) {
2034                 case IFLA_TARGET_NETNSID:
2035                         netnsid = nla_get_s32(tb[i]);
2036                         tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
2037                         if (IS_ERR(tgt_net)) {
2038                                 NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
2039                                 return PTR_ERR(tgt_net);
2040                         }
2041                         break;
2042                 case IFLA_EXT_MASK:
2043                         ext_filter_mask = nla_get_u32(tb[i]);
2044                         break;
2045                 case IFLA_MASTER:
2046                         master_idx = nla_get_u32(tb[i]);
2047                         break;
2048                 case IFLA_LINKINFO:
2049                         kind_ops = linkinfo_to_kind_ops(tb[i]);
2050                         break;
2051                 default:
2052                         if (cb->strict_check) {
2053                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
2054                                 return -EINVAL;
2055                         }
2056                 }
2057         }
2058
2059         if (master_idx || kind_ops)
2060                 flags |= NLM_F_DUMP_FILTERED;
2061
2062 walk_entries:
2063         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2064                 idx = 0;
2065                 head = &tgt_net->dev_index_head[h];
2066                 hlist_for_each_entry(dev, head, index_hlist) {
2067                         if (link_dump_filtered(dev, master_idx, kind_ops))
2068                                 goto cont;
2069                         if (idx < s_idx)
2070                                 goto cont;
2071                         err = rtnl_fill_ifinfo(skb, dev, net,
2072                                                RTM_NEWLINK,
2073                                                NETLINK_CB(cb->skb).portid,
2074                                                nlh->nlmsg_seq, 0, flags,
2075                                                ext_filter_mask, 0, NULL, 0,
2076                                                netnsid, GFP_KERNEL);
2077
2078                         if (err < 0) {
2079                                 if (likely(skb->len))
2080                                         goto out;
2081
2082                                 goto out_err;
2083                         }
2084 cont:
2085                         idx++;
2086                 }
2087         }
2088 out:
2089         err = skb->len;
2090 out_err:
2091         cb->args[1] = idx;
2092         cb->args[0] = h;
2093         cb->seq = net->dev_base_seq;
2094         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2095         if (netnsid >= 0)
2096                 put_net(tgt_net);
2097
2098         return err;
2099 }
2100
2101 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2102                         struct netlink_ext_ack *exterr)
2103 {
2104         return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
2105                                     exterr);
2106 }
2107 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
2108
2109 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2110 {
2111         struct net *net;
2112         /* Examine the link attributes and figure out which
2113          * network namespace we are talking about.
2114          */
2115         if (tb[IFLA_NET_NS_PID])
2116                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2117         else if (tb[IFLA_NET_NS_FD])
2118                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2119         else
2120                 net = get_net(src_net);
2121         return net;
2122 }
2123 EXPORT_SYMBOL(rtnl_link_get_net);
2124
2125 /* Figure out which network namespace we are talking about by
2126  * examining the link attributes in the following order:
2127  *
2128  * 1. IFLA_NET_NS_PID
2129  * 2. IFLA_NET_NS_FD
2130  * 3. IFLA_TARGET_NETNSID
2131  */
2132 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2133                                                struct nlattr *tb[])
2134 {
2135         struct net *net;
2136
2137         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2138                 return rtnl_link_get_net(src_net, tb);
2139
2140         if (!tb[IFLA_TARGET_NETNSID])
2141                 return get_net(src_net);
2142
2143         net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2144         if (!net)
2145                 return ERR_PTR(-EINVAL);
2146
2147         return net;
2148 }
2149
2150 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2151                                              struct net *src_net,
2152                                              struct nlattr *tb[], int cap)
2153 {
2154         struct net *net;
2155
2156         net = rtnl_link_get_net_by_nlattr(src_net, tb);
2157         if (IS_ERR(net))
2158                 return net;
2159
2160         if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2161                 put_net(net);
2162                 return ERR_PTR(-EPERM);
2163         }
2164
2165         return net;
2166 }
2167
2168 /* Verify that rtnetlink requests do not pass additional properties
2169  * potentially referring to different network namespaces.
2170  */
2171 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2172                                     struct netlink_ext_ack *extack,
2173                                     bool netns_id_only)
2174 {
2175
2176         if (netns_id_only) {
2177                 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2178                         return 0;
2179
2180                 NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2181                 return -EOPNOTSUPP;
2182         }
2183
2184         if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2185                 goto invalid_attr;
2186
2187         if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2188                 goto invalid_attr;
2189
2190         if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2191                 goto invalid_attr;
2192
2193         return 0;
2194
2195 invalid_attr:
2196         NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2197         return -EINVAL;
2198 }
2199
2200 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
2201 {
2202         if (dev) {
2203                 if (tb[IFLA_ADDRESS] &&
2204                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2205                         return -EINVAL;
2206
2207                 if (tb[IFLA_BROADCAST] &&
2208                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2209                         return -EINVAL;
2210         }
2211
2212         if (tb[IFLA_AF_SPEC]) {
2213                 struct nlattr *af;
2214                 int rem, err;
2215
2216                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2217                         const struct rtnl_af_ops *af_ops;
2218
2219                         rcu_read_lock();
2220                         af_ops = rtnl_af_lookup(nla_type(af));
2221                         if (!af_ops) {
2222                                 rcu_read_unlock();
2223                                 return -EAFNOSUPPORT;
2224                         }
2225
2226                         if (!af_ops->set_link_af) {
2227                                 rcu_read_unlock();
2228                                 return -EOPNOTSUPP;
2229                         }
2230
2231                         if (af_ops->validate_link_af) {
2232                                 err = af_ops->validate_link_af(dev, af);
2233                                 if (err < 0) {
2234                                         rcu_read_unlock();
2235                                         return err;
2236                                 }
2237                         }
2238
2239                         rcu_read_unlock();
2240                 }
2241         }
2242
2243         return 0;
2244 }
2245
2246 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2247                                   int guid_type)
2248 {
2249         const struct net_device_ops *ops = dev->netdev_ops;
2250
2251         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2252 }
2253
2254 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2255 {
2256         if (dev->type != ARPHRD_INFINIBAND)
2257                 return -EOPNOTSUPP;
2258
2259         return handle_infiniband_guid(dev, ivt, guid_type);
2260 }
2261
2262 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2263 {
2264         const struct net_device_ops *ops = dev->netdev_ops;
2265         int err = -EINVAL;
2266
2267         if (tb[IFLA_VF_MAC]) {
2268                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2269
2270                 if (ivm->vf >= INT_MAX)
2271                         return -EINVAL;
2272                 err = -EOPNOTSUPP;
2273                 if (ops->ndo_set_vf_mac)
2274                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
2275                                                   ivm->mac);
2276                 if (err < 0)
2277                         return err;
2278         }
2279
2280         if (tb[IFLA_VF_VLAN]) {
2281                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2282
2283                 if (ivv->vf >= INT_MAX)
2284                         return -EINVAL;
2285                 err = -EOPNOTSUPP;
2286                 if (ops->ndo_set_vf_vlan)
2287                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2288                                                    ivv->qos,
2289                                                    htons(ETH_P_8021Q));
2290                 if (err < 0)
2291                         return err;
2292         }
2293
2294         if (tb[IFLA_VF_VLAN_LIST]) {
2295                 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2296                 struct nlattr *attr;
2297                 int rem, len = 0;
2298
2299                 err = -EOPNOTSUPP;
2300                 if (!ops->ndo_set_vf_vlan)
2301                         return err;
2302
2303                 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2304                         if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2305                             nla_len(attr) < NLA_HDRLEN) {
2306                                 return -EINVAL;
2307                         }
2308                         if (len >= MAX_VLAN_LIST_LEN)
2309                                 return -EOPNOTSUPP;
2310                         ivvl[len] = nla_data(attr);
2311
2312                         len++;
2313                 }
2314                 if (len == 0)
2315                         return -EINVAL;
2316
2317                 if (ivvl[0]->vf >= INT_MAX)
2318                         return -EINVAL;
2319                 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2320                                            ivvl[0]->qos, ivvl[0]->vlan_proto);
2321                 if (err < 0)
2322                         return err;
2323         }
2324
2325         if (tb[IFLA_VF_TX_RATE]) {
2326                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2327                 struct ifla_vf_info ivf;
2328
2329                 if (ivt->vf >= INT_MAX)
2330                         return -EINVAL;
2331                 err = -EOPNOTSUPP;
2332                 if (ops->ndo_get_vf_config)
2333                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2334                 if (err < 0)
2335                         return err;
2336
2337                 err = -EOPNOTSUPP;
2338                 if (ops->ndo_set_vf_rate)
2339                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2340                                                    ivf.min_tx_rate,
2341                                                    ivt->rate);
2342                 if (err < 0)
2343                         return err;
2344         }
2345
2346         if (tb[IFLA_VF_RATE]) {
2347                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2348
2349                 if (ivt->vf >= INT_MAX)
2350                         return -EINVAL;
2351                 err = -EOPNOTSUPP;
2352                 if (ops->ndo_set_vf_rate)
2353                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2354                                                    ivt->min_tx_rate,
2355                                                    ivt->max_tx_rate);
2356                 if (err < 0)
2357                         return err;
2358         }
2359
2360         if (tb[IFLA_VF_SPOOFCHK]) {
2361                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2362
2363                 if (ivs->vf >= INT_MAX)
2364                         return -EINVAL;
2365                 err = -EOPNOTSUPP;
2366                 if (ops->ndo_set_vf_spoofchk)
2367                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2368                                                        ivs->setting);
2369                 if (err < 0)
2370                         return err;
2371         }
2372
2373         if (tb[IFLA_VF_LINK_STATE]) {
2374                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2375
2376                 if (ivl->vf >= INT_MAX)
2377                         return -EINVAL;
2378                 err = -EOPNOTSUPP;
2379                 if (ops->ndo_set_vf_link_state)
2380                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2381                                                          ivl->link_state);
2382                 if (err < 0)
2383                         return err;
2384         }
2385
2386         if (tb[IFLA_VF_RSS_QUERY_EN]) {
2387                 struct ifla_vf_rss_query_en *ivrssq_en;
2388
2389                 err = -EOPNOTSUPP;
2390                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2391                 if (ivrssq_en->vf >= INT_MAX)
2392                         return -EINVAL;
2393                 if (ops->ndo_set_vf_rss_query_en)
2394                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2395                                                            ivrssq_en->setting);
2396                 if (err < 0)
2397                         return err;
2398         }
2399
2400         if (tb[IFLA_VF_TRUST]) {
2401                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2402
2403                 if (ivt->vf >= INT_MAX)
2404                         return -EINVAL;
2405                 err = -EOPNOTSUPP;
2406                 if (ops->ndo_set_vf_trust)
2407                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2408                 if (err < 0)
2409                         return err;
2410         }
2411
2412         if (tb[IFLA_VF_IB_NODE_GUID]) {
2413                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2414
2415                 if (ivt->vf >= INT_MAX)
2416                         return -EINVAL;
2417                 if (!ops->ndo_set_vf_guid)
2418                         return -EOPNOTSUPP;
2419                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2420         }
2421
2422         if (tb[IFLA_VF_IB_PORT_GUID]) {
2423                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2424
2425                 if (ivt->vf >= INT_MAX)
2426                         return -EINVAL;
2427                 if (!ops->ndo_set_vf_guid)
2428                         return -EOPNOTSUPP;
2429
2430                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2431         }
2432
2433         return err;
2434 }
2435
2436 static int do_set_master(struct net_device *dev, int ifindex,
2437                          struct netlink_ext_ack *extack)
2438 {
2439         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2440         const struct net_device_ops *ops;
2441         int err;
2442
2443         if (upper_dev) {
2444                 if (upper_dev->ifindex == ifindex)
2445                         return 0;
2446                 ops = upper_dev->netdev_ops;
2447                 if (ops->ndo_del_slave) {
2448                         err = ops->ndo_del_slave(upper_dev, dev);
2449                         if (err)
2450                                 return err;
2451                         netdev_update_lockdep_key(dev);
2452                 } else {
2453                         return -EOPNOTSUPP;
2454                 }
2455         }
2456
2457         if (ifindex) {
2458                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2459                 if (!upper_dev)
2460                         return -EINVAL;
2461                 ops = upper_dev->netdev_ops;
2462                 if (ops->ndo_add_slave) {
2463                         err = ops->ndo_add_slave(upper_dev, dev, extack);
2464                         if (err)
2465                                 return err;
2466                 } else {
2467                         return -EOPNOTSUPP;
2468                 }
2469         }
2470         return 0;
2471 }
2472
2473 #define DO_SETLINK_MODIFIED     0x01
2474 /* notify flag means notify + modified. */
2475 #define DO_SETLINK_NOTIFY       0x03
2476 static int do_setlink(const struct sk_buff *skb,
2477                       struct net_device *dev, struct ifinfomsg *ifm,
2478                       struct netlink_ext_ack *extack,
2479                       struct nlattr **tb, char *ifname, int status)
2480 {
2481         const struct net_device_ops *ops = dev->netdev_ops;
2482         int err;
2483
2484         err = validate_linkmsg(dev, tb);
2485         if (err < 0)
2486                 return err;
2487
2488         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2489                 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev),
2490                                                             tb, CAP_NET_ADMIN);
2491                 if (IS_ERR(net)) {
2492                         err = PTR_ERR(net);
2493                         goto errout;
2494                 }
2495
2496                 err = dev_change_net_namespace(dev, net, ifname);
2497                 put_net(net);
2498                 if (err)
2499                         goto errout;
2500                 status |= DO_SETLINK_MODIFIED;
2501         }
2502
2503         if (tb[IFLA_MAP]) {
2504                 struct rtnl_link_ifmap *u_map;
2505                 struct ifmap k_map;
2506
2507                 if (!ops->ndo_set_config) {
2508                         err = -EOPNOTSUPP;
2509                         goto errout;
2510                 }
2511
2512                 if (!netif_device_present(dev)) {
2513                         err = -ENODEV;
2514                         goto errout;
2515                 }
2516
2517                 u_map = nla_data(tb[IFLA_MAP]);
2518                 k_map.mem_start = (unsigned long) u_map->mem_start;
2519                 k_map.mem_end = (unsigned long) u_map->mem_end;
2520                 k_map.base_addr = (unsigned short) u_map->base_addr;
2521                 k_map.irq = (unsigned char) u_map->irq;
2522                 k_map.dma = (unsigned char) u_map->dma;
2523                 k_map.port = (unsigned char) u_map->port;
2524
2525                 err = ops->ndo_set_config(dev, &k_map);
2526                 if (err < 0)
2527                         goto errout;
2528
2529                 status |= DO_SETLINK_NOTIFY;
2530         }
2531
2532         if (tb[IFLA_ADDRESS]) {
2533                 struct sockaddr *sa;
2534                 int len;
2535
2536                 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2537                                                   sizeof(*sa));
2538                 sa = kmalloc(len, GFP_KERNEL);
2539                 if (!sa) {
2540                         err = -ENOMEM;
2541                         goto errout;
2542                 }
2543                 sa->sa_family = dev->type;
2544                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2545                        dev->addr_len);
2546                 err = dev_set_mac_address(dev, sa, extack);
2547                 kfree(sa);
2548                 if (err)
2549                         goto errout;
2550                 status |= DO_SETLINK_MODIFIED;
2551         }
2552
2553         if (tb[IFLA_MTU]) {
2554                 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2555                 if (err < 0)
2556                         goto errout;
2557                 status |= DO_SETLINK_MODIFIED;
2558         }
2559
2560         if (tb[IFLA_GROUP]) {
2561                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2562                 status |= DO_SETLINK_NOTIFY;
2563         }
2564
2565         /*
2566          * Interface selected by interface index but interface
2567          * name provided implies that a name change has been
2568          * requested.
2569          */
2570         if (ifm->ifi_index > 0 && ifname[0]) {
2571                 err = dev_change_name(dev, ifname);
2572                 if (err < 0)
2573                         goto errout;
2574                 status |= DO_SETLINK_MODIFIED;
2575         }
2576
2577         if (tb[IFLA_IFALIAS]) {
2578                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2579                                     nla_len(tb[IFLA_IFALIAS]));
2580                 if (err < 0)
2581                         goto errout;
2582                 status |= DO_SETLINK_NOTIFY;
2583         }
2584
2585         if (tb[IFLA_BROADCAST]) {
2586                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2587                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2588         }
2589
2590         if (ifm->ifi_flags || ifm->ifi_change) {
2591                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2592                                        extack);
2593                 if (err < 0)
2594                         goto errout;
2595         }
2596
2597         if (tb[IFLA_MASTER]) {
2598                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2599                 if (err)
2600                         goto errout;
2601                 status |= DO_SETLINK_MODIFIED;
2602         }
2603
2604         if (tb[IFLA_CARRIER]) {
2605                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2606                 if (err)
2607                         goto errout;
2608                 status |= DO_SETLINK_MODIFIED;
2609         }
2610
2611         if (tb[IFLA_TXQLEN]) {
2612                 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2613
2614                 err = dev_change_tx_queue_len(dev, value);
2615                 if (err)
2616                         goto errout;
2617                 status |= DO_SETLINK_MODIFIED;
2618         }
2619
2620         if (tb[IFLA_GSO_MAX_SIZE]) {
2621                 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2622
2623                 if (max_size > GSO_MAX_SIZE) {
2624                         err = -EINVAL;
2625                         goto errout;
2626                 }
2627
2628                 if (dev->gso_max_size ^ max_size) {
2629                         netif_set_gso_max_size(dev, max_size);
2630                         status |= DO_SETLINK_MODIFIED;
2631                 }
2632         }
2633
2634         if (tb[IFLA_GSO_MAX_SEGS]) {
2635                 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2636
2637                 if (max_segs > GSO_MAX_SEGS) {
2638                         err = -EINVAL;
2639                         goto errout;
2640                 }
2641
2642                 if (dev->gso_max_segs ^ max_segs) {
2643                         dev->gso_max_segs = max_segs;
2644                         status |= DO_SETLINK_MODIFIED;
2645                 }
2646         }
2647
2648         if (tb[IFLA_OPERSTATE])
2649                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2650
2651         if (tb[IFLA_LINKMODE]) {
2652                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2653
2654                 write_lock_bh(&dev_base_lock);
2655                 if (dev->link_mode ^ value)
2656                         status |= DO_SETLINK_NOTIFY;
2657                 dev->link_mode = value;
2658                 write_unlock_bh(&dev_base_lock);
2659         }
2660
2661         if (tb[IFLA_VFINFO_LIST]) {
2662                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2663                 struct nlattr *attr;
2664                 int rem;
2665
2666                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2667                         if (nla_type(attr) != IFLA_VF_INFO ||
2668                             nla_len(attr) < NLA_HDRLEN) {
2669                                 err = -EINVAL;
2670                                 goto errout;
2671                         }
2672                         err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
2673                                                           attr,
2674                                                           ifla_vf_policy,
2675                                                           NULL);
2676                         if (err < 0)
2677                                 goto errout;
2678                         err = do_setvfinfo(dev, vfinfo);
2679                         if (err < 0)
2680                                 goto errout;
2681                         status |= DO_SETLINK_NOTIFY;
2682                 }
2683         }
2684         err = 0;
2685
2686         if (tb[IFLA_VF_PORTS]) {
2687                 struct nlattr *port[IFLA_PORT_MAX+1];
2688                 struct nlattr *attr;
2689                 int vf;
2690                 int rem;
2691
2692                 err = -EOPNOTSUPP;
2693                 if (!ops->ndo_set_vf_port)
2694                         goto errout;
2695
2696                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2697                         if (nla_type(attr) != IFLA_VF_PORT ||
2698                             nla_len(attr) < NLA_HDRLEN) {
2699                                 err = -EINVAL;
2700                                 goto errout;
2701                         }
2702                         err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2703                                                           attr,
2704                                                           ifla_port_policy,
2705                                                           NULL);
2706                         if (err < 0)
2707                                 goto errout;
2708                         if (!port[IFLA_PORT_VF]) {
2709                                 err = -EOPNOTSUPP;
2710                                 goto errout;
2711                         }
2712                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2713                         err = ops->ndo_set_vf_port(dev, vf, port);
2714                         if (err < 0)
2715                                 goto errout;
2716                         status |= DO_SETLINK_NOTIFY;
2717                 }
2718         }
2719         err = 0;
2720
2721         if (tb[IFLA_PORT_SELF]) {
2722                 struct nlattr *port[IFLA_PORT_MAX+1];
2723
2724                 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2725                                                   tb[IFLA_PORT_SELF],
2726                                                   ifla_port_policy, NULL);
2727                 if (err < 0)
2728                         goto errout;
2729
2730                 err = -EOPNOTSUPP;
2731                 if (ops->ndo_set_vf_port)
2732                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2733                 if (err < 0)
2734                         goto errout;
2735                 status |= DO_SETLINK_NOTIFY;
2736         }
2737
2738         if (tb[IFLA_AF_SPEC]) {
2739                 struct nlattr *af;
2740                 int rem;
2741
2742                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2743                         const struct rtnl_af_ops *af_ops;
2744
2745                         rcu_read_lock();
2746
2747                         BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2748
2749                         err = af_ops->set_link_af(dev, af);
2750                         if (err < 0) {
2751                                 rcu_read_unlock();
2752                                 goto errout;
2753                         }
2754
2755                         rcu_read_unlock();
2756                         status |= DO_SETLINK_NOTIFY;
2757                 }
2758         }
2759         err = 0;
2760
2761         if (tb[IFLA_PROTO_DOWN]) {
2762                 err = dev_change_proto_down(dev,
2763                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2764                 if (err)
2765                         goto errout;
2766                 status |= DO_SETLINK_NOTIFY;
2767         }
2768
2769         if (tb[IFLA_XDP]) {
2770                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2771                 u32 xdp_flags = 0;
2772
2773                 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
2774                                                   tb[IFLA_XDP],
2775                                                   ifla_xdp_policy, NULL);
2776                 if (err < 0)
2777                         goto errout;
2778
2779                 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2780                         err = -EINVAL;
2781                         goto errout;
2782                 }
2783
2784                 if (xdp[IFLA_XDP_FLAGS]) {
2785                         xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2786                         if (xdp_flags & ~XDP_FLAGS_MASK) {
2787                                 err = -EINVAL;
2788                                 goto errout;
2789                         }
2790                         if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2791                                 err = -EINVAL;
2792                                 goto errout;
2793                         }
2794                 }
2795
2796                 if (xdp[IFLA_XDP_FD]) {
2797                         err = dev_change_xdp_fd(dev, extack,
2798                                                 nla_get_s32(xdp[IFLA_XDP_FD]),
2799                                                 xdp_flags);
2800                         if (err)
2801                                 goto errout;
2802                         status |= DO_SETLINK_NOTIFY;
2803                 }
2804         }
2805
2806 errout:
2807         if (status & DO_SETLINK_MODIFIED) {
2808                 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2809                         netdev_state_change(dev);
2810
2811                 if (err < 0)
2812                         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",
2813                                              dev->name);
2814         }
2815
2816         return err;
2817 }
2818
2819 static struct net_device *rtnl_dev_get(struct net *net,
2820                                        struct nlattr *ifname_attr,
2821                                        struct nlattr *altifname_attr,
2822                                        char *ifname)
2823 {
2824         char buffer[ALTIFNAMSIZ];
2825
2826         if (!ifname) {
2827                 ifname = buffer;
2828                 if (ifname_attr)
2829                         nla_strlcpy(ifname, ifname_attr, IFNAMSIZ);
2830                 else if (altifname_attr)
2831                         nla_strlcpy(ifname, altifname_attr, ALTIFNAMSIZ);
2832                 else
2833                         return NULL;
2834         }
2835
2836         return __dev_get_by_name(net, ifname);
2837 }
2838
2839 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2840                         struct netlink_ext_ack *extack)
2841 {
2842         struct net *net = sock_net(skb->sk);
2843         struct ifinfomsg *ifm;
2844         struct net_device *dev;
2845         int err;
2846         struct nlattr *tb[IFLA_MAX+1];
2847         char ifname[IFNAMSIZ];
2848
2849         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2850                                      ifla_policy, extack);
2851         if (err < 0)
2852                 goto errout;
2853
2854         err = rtnl_ensure_unique_netns(tb, extack, false);
2855         if (err < 0)
2856                 goto errout;
2857
2858         if (tb[IFLA_IFNAME])
2859                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2860         else
2861                 ifname[0] = '\0';
2862
2863         err = -EINVAL;
2864         ifm = nlmsg_data(nlh);
2865         if (ifm->ifi_index > 0)
2866                 dev = __dev_get_by_index(net, ifm->ifi_index);
2867         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
2868                 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
2869         else
2870                 goto errout;
2871
2872         if (dev == NULL) {
2873                 err = -ENODEV;
2874                 goto errout;
2875         }
2876
2877         err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2878 errout:
2879         return err;
2880 }
2881
2882 static int rtnl_group_dellink(const struct net *net, int group)
2883 {
2884         struct net_device *dev, *aux;
2885         LIST_HEAD(list_kill);
2886         bool found = false;
2887
2888         if (!group)
2889                 return -EPERM;
2890
2891         for_each_netdev(net, dev) {
2892                 if (dev->group == group) {
2893                         const struct rtnl_link_ops *ops;
2894
2895                         found = true;
2896                         ops = dev->rtnl_link_ops;
2897                         if (!ops || !ops->dellink)
2898                                 return -EOPNOTSUPP;
2899                 }
2900         }
2901
2902         if (!found)
2903                 return -ENODEV;
2904
2905         for_each_netdev_safe(net, dev, aux) {
2906                 if (dev->group == group) {
2907                         const struct rtnl_link_ops *ops;
2908
2909                         ops = dev->rtnl_link_ops;
2910                         ops->dellink(dev, &list_kill);
2911                 }
2912         }
2913         unregister_netdevice_many(&list_kill);
2914
2915         return 0;
2916 }
2917
2918 int rtnl_delete_link(struct net_device *dev)
2919 {
2920         const struct rtnl_link_ops *ops;
2921         LIST_HEAD(list_kill);
2922
2923         ops = dev->rtnl_link_ops;
2924         if (!ops || !ops->dellink)
2925                 return -EOPNOTSUPP;
2926
2927         ops->dellink(dev, &list_kill);
2928         unregister_netdevice_many(&list_kill);
2929
2930         return 0;
2931 }
2932 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2933
2934 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2935                         struct netlink_ext_ack *extack)
2936 {
2937         struct net *net = sock_net(skb->sk);
2938         struct net *tgt_net = net;
2939         struct net_device *dev = NULL;
2940         struct ifinfomsg *ifm;
2941         struct nlattr *tb[IFLA_MAX+1];
2942         int err;
2943         int netnsid = -1;
2944
2945         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2946                                      ifla_policy, extack);
2947         if (err < 0)
2948                 return err;
2949
2950         err = rtnl_ensure_unique_netns(tb, extack, true);
2951         if (err < 0)
2952                 return err;
2953
2954         if (tb[IFLA_TARGET_NETNSID]) {
2955                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
2956                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
2957                 if (IS_ERR(tgt_net))
2958                         return PTR_ERR(tgt_net);
2959         }
2960
2961         err = -EINVAL;
2962         ifm = nlmsg_data(nlh);
2963         if (ifm->ifi_index > 0)
2964                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
2965         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
2966                 dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
2967                                    tb[IFLA_ALT_IFNAME], NULL);
2968         else if (tb[IFLA_GROUP])
2969                 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
2970         else
2971                 goto out;
2972
2973         if (!dev) {
2974                 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
2975                         err = -ENODEV;
2976
2977                 goto out;
2978         }
2979
2980         err = rtnl_delete_link(dev);
2981
2982 out:
2983         if (netnsid >= 0)
2984                 put_net(tgt_net);
2985
2986         return err;
2987 }
2988
2989 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2990 {
2991         unsigned int old_flags;
2992         int err;
2993
2994         old_flags = dev->flags;
2995         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2996                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2997                                          NULL);
2998                 if (err < 0)
2999                         return err;
3000         }
3001
3002         if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
3003                 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
3004         } else {
3005                 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
3006                 __dev_notify_flags(dev, old_flags, ~0U);
3007         }
3008         return 0;
3009 }
3010 EXPORT_SYMBOL(rtnl_configure_link);
3011
3012 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
3013                                     unsigned char name_assign_type,
3014                                     const struct rtnl_link_ops *ops,
3015                                     struct nlattr *tb[],
3016                                     struct netlink_ext_ack *extack)
3017 {
3018         struct net_device *dev;
3019         unsigned int num_tx_queues = 1;
3020         unsigned int num_rx_queues = 1;
3021
3022         if (tb[IFLA_NUM_TX_QUEUES])
3023                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
3024         else if (ops->get_num_tx_queues)
3025                 num_tx_queues = ops->get_num_tx_queues();
3026
3027         if (tb[IFLA_NUM_RX_QUEUES])
3028                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
3029         else if (ops->get_num_rx_queues)
3030                 num_rx_queues = ops->get_num_rx_queues();
3031
3032         if (num_tx_queues < 1 || num_tx_queues > 4096) {
3033                 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
3034                 return ERR_PTR(-EINVAL);
3035         }
3036
3037         if (num_rx_queues < 1 || num_rx_queues > 4096) {
3038                 NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
3039                 return ERR_PTR(-EINVAL);
3040         }
3041
3042         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
3043                                ops->setup, num_tx_queues, num_rx_queues);
3044         if (!dev)
3045                 return ERR_PTR(-ENOMEM);
3046
3047         dev_net_set(dev, net);
3048         dev->rtnl_link_ops = ops;
3049         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
3050
3051         if (tb[IFLA_MTU])
3052                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
3053         if (tb[IFLA_ADDRESS]) {
3054                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
3055                                 nla_len(tb[IFLA_ADDRESS]));
3056                 dev->addr_assign_type = NET_ADDR_SET;
3057         }
3058         if (tb[IFLA_BROADCAST])
3059                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
3060                                 nla_len(tb[IFLA_BROADCAST]));
3061         if (tb[IFLA_TXQLEN])
3062                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
3063         if (tb[IFLA_OPERSTATE])
3064                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
3065         if (tb[IFLA_LINKMODE])
3066                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
3067         if (tb[IFLA_GROUP])
3068                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
3069         if (tb[IFLA_GSO_MAX_SIZE])
3070                 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
3071         if (tb[IFLA_GSO_MAX_SEGS])
3072                 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
3073
3074         return dev;
3075 }
3076 EXPORT_SYMBOL(rtnl_create_link);
3077
3078 static int rtnl_group_changelink(const struct sk_buff *skb,
3079                 struct net *net, int group,
3080                 struct ifinfomsg *ifm,
3081                 struct netlink_ext_ack *extack,
3082                 struct nlattr **tb)
3083 {
3084         struct net_device *dev, *aux;
3085         int err;
3086
3087         for_each_netdev_safe(net, dev, aux) {
3088                 if (dev->group == group) {
3089                         err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
3090                         if (err < 0)
3091                                 return err;
3092                 }
3093         }
3094
3095         return 0;
3096 }
3097
3098 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3099                           struct nlattr **attr, struct netlink_ext_ack *extack)
3100 {
3101         struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3102         unsigned char name_assign_type = NET_NAME_USER;
3103         struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
3104         const struct rtnl_link_ops *m_ops = NULL;
3105         struct net_device *master_dev = NULL;
3106         struct net *net = sock_net(skb->sk);
3107         const struct rtnl_link_ops *ops;
3108         struct nlattr *tb[IFLA_MAX + 1];
3109         struct net *dest_net, *link_net;
3110         struct nlattr **slave_data;
3111         char kind[MODULE_NAME_LEN];
3112         struct net_device *dev;
3113         struct ifinfomsg *ifm;
3114         char ifname[IFNAMSIZ];
3115         struct nlattr **data;
3116         int err;
3117
3118 #ifdef CONFIG_MODULES
3119 replay:
3120 #endif
3121         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3122                                      ifla_policy, extack);
3123         if (err < 0)
3124                 return err;
3125
3126         err = rtnl_ensure_unique_netns(tb, extack, false);
3127         if (err < 0)
3128                 return err;
3129
3130         if (tb[IFLA_IFNAME])
3131                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3132         else
3133                 ifname[0] = '\0';
3134
3135         ifm = nlmsg_data(nlh);
3136         if (ifm->ifi_index > 0)
3137                 dev = __dev_get_by_index(net, ifm->ifi_index);
3138         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3139                 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
3140         else
3141                 dev = NULL;
3142
3143         if (dev) {
3144                 master_dev = netdev_master_upper_dev_get(dev);
3145                 if (master_dev)
3146                         m_ops = master_dev->rtnl_link_ops;
3147         }
3148
3149         err = validate_linkmsg(dev, tb);
3150         if (err < 0)
3151                 return err;
3152
3153         if (tb[IFLA_LINKINFO]) {
3154                 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3155                                                   tb[IFLA_LINKINFO],
3156                                                   ifla_info_policy, NULL);
3157                 if (err < 0)
3158                         return err;
3159         } else
3160                 memset(linkinfo, 0, sizeof(linkinfo));
3161
3162         if (linkinfo[IFLA_INFO_KIND]) {
3163                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3164                 ops = rtnl_link_ops_get(kind);
3165         } else {
3166                 kind[0] = '\0';
3167                 ops = NULL;
3168         }
3169
3170         data = NULL;
3171         if (ops) {
3172                 if (ops->maxtype > RTNL_MAX_TYPE)
3173                         return -EINVAL;
3174
3175                 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3176                         err = nla_parse_nested_deprecated(attr, ops->maxtype,
3177                                                           linkinfo[IFLA_INFO_DATA],
3178                                                           ops->policy, extack);
3179                         if (err < 0)
3180                                 return err;
3181                         data = attr;
3182                 }
3183                 if (ops->validate) {
3184                         err = ops->validate(tb, data, extack);
3185                         if (err < 0)
3186                                 return err;
3187                 }
3188         }
3189
3190         slave_data = NULL;
3191         if (m_ops) {
3192                 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3193                         return -EINVAL;
3194
3195                 if (m_ops->slave_maxtype &&
3196                     linkinfo[IFLA_INFO_SLAVE_DATA]) {
3197                         err = nla_parse_nested_deprecated(slave_attr,
3198                                                           m_ops->slave_maxtype,
3199                                                           linkinfo[IFLA_INFO_SLAVE_DATA],
3200                                                           m_ops->slave_policy,
3201                                                           extack);
3202                         if (err < 0)
3203                                 return err;
3204                         slave_data = slave_attr;
3205                 }
3206         }
3207
3208         if (dev) {
3209                 int status = 0;
3210
3211                 if (nlh->nlmsg_flags & NLM_F_EXCL)
3212                         return -EEXIST;
3213                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3214                         return -EOPNOTSUPP;
3215
3216                 if (linkinfo[IFLA_INFO_DATA]) {
3217                         if (!ops || ops != dev->rtnl_link_ops ||
3218                             !ops->changelink)
3219                                 return -EOPNOTSUPP;
3220
3221                         err = ops->changelink(dev, tb, data, extack);
3222                         if (err < 0)
3223                                 return err;
3224                         status |= DO_SETLINK_NOTIFY;
3225                 }
3226
3227                 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3228                         if (!m_ops || !m_ops->slave_changelink)
3229                                 return -EOPNOTSUPP;
3230
3231                         err = m_ops->slave_changelink(master_dev, dev, tb,
3232                                                       slave_data, extack);
3233                         if (err < 0)
3234                                 return err;
3235                         status |= DO_SETLINK_NOTIFY;
3236                 }
3237
3238                 return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
3239         }
3240
3241         if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3242                 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3243                         return rtnl_group_changelink(skb, net,
3244                                                 nla_get_u32(tb[IFLA_GROUP]),
3245                                                 ifm, extack, tb);
3246                 return -ENODEV;
3247         }
3248
3249         if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3250                 return -EOPNOTSUPP;
3251
3252         if (!ops) {
3253 #ifdef CONFIG_MODULES
3254                 if (kind[0]) {
3255                         __rtnl_unlock();
3256                         request_module("rtnl-link-%s", kind);
3257                         rtnl_lock();
3258                         ops = rtnl_link_ops_get(kind);
3259                         if (ops)
3260                                 goto replay;
3261                 }
3262 #endif
3263                 NL_SET_ERR_MSG(extack, "Unknown device type");
3264                 return -EOPNOTSUPP;
3265         }
3266
3267         if (!ops->setup)
3268                 return -EOPNOTSUPP;
3269
3270         if (!ifname[0]) {
3271                 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3272                 name_assign_type = NET_NAME_ENUM;
3273         }
3274
3275         dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3276         if (IS_ERR(dest_net))
3277                 return PTR_ERR(dest_net);
3278
3279         if (tb[IFLA_LINK_NETNSID]) {
3280                 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3281
3282                 link_net = get_net_ns_by_id(dest_net, id);
3283                 if (!link_net) {
3284                         NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3285                         err =  -EINVAL;
3286                         goto out;
3287                 }
3288                 err = -EPERM;
3289                 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3290                         goto out;
3291         } else {
3292                 link_net = NULL;
3293         }
3294
3295         dev = rtnl_create_link(link_net ? : dest_net, ifname,
3296                                name_assign_type, ops, tb, extack);
3297         if (IS_ERR(dev)) {
3298                 err = PTR_ERR(dev);
3299                 goto out;
3300         }
3301
3302         dev->ifindex = ifm->ifi_index;
3303
3304         if (ops->newlink) {
3305                 err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3306                 /* Drivers should call free_netdev() in ->destructor
3307                  * and unregister it on failure after registration
3308                  * so that device could be finally freed in rtnl_unlock.
3309                  */
3310                 if (err < 0) {
3311                         /* If device is not registered at all, free it now */
3312                         if (dev->reg_state == NETREG_UNINITIALIZED)
3313                                 free_netdev(dev);
3314                         goto out;
3315                 }
3316         } else {
3317                 err = register_netdevice(dev);
3318                 if (err < 0) {
3319                         free_netdev(dev);
3320                         goto out;
3321                 }
3322         }
3323         err = rtnl_configure_link(dev, ifm);
3324         if (err < 0)
3325                 goto out_unregister;
3326         if (link_net) {
3327                 err = dev_change_net_namespace(dev, dest_net, ifname);
3328                 if (err < 0)
3329                         goto out_unregister;
3330         }
3331         if (tb[IFLA_MASTER]) {
3332                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3333                 if (err)
3334                         goto out_unregister;
3335         }
3336 out:
3337         if (link_net)
3338                 put_net(link_net);
3339         put_net(dest_net);
3340         return err;
3341 out_unregister:
3342         if (ops->newlink) {
3343                 LIST_HEAD(list_kill);
3344
3345                 ops->dellink(dev, &list_kill);
3346                 unregister_netdevice_many(&list_kill);
3347         } else {
3348                 unregister_netdevice(dev);
3349         }
3350         goto out;
3351 }
3352
3353 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3354                         struct netlink_ext_ack *extack)
3355 {
3356         struct nlattr **attr;
3357         int ret;
3358
3359         attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
3360         if (!attr)
3361                 return -ENOMEM;
3362
3363         ret = __rtnl_newlink(skb, nlh, attr, extack);
3364         kfree(attr);
3365         return ret;
3366 }
3367
3368 static int rtnl_valid_getlink_req(struct sk_buff *skb,
3369                                   const struct nlmsghdr *nlh,
3370                                   struct nlattr **tb,
3371                                   struct netlink_ext_ack *extack)
3372 {
3373         struct ifinfomsg *ifm;
3374         int i, err;
3375
3376         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3377                 NL_SET_ERR_MSG(extack, "Invalid header for get link");
3378                 return -EINVAL;
3379         }
3380
3381         if (!netlink_strict_get_check(skb))
3382                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3383                                               ifla_policy, extack);
3384
3385         ifm = nlmsg_data(nlh);
3386         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3387             ifm->ifi_change) {
3388                 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3389                 return -EINVAL;
3390         }
3391
3392         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3393                                             ifla_policy, extack);
3394         if (err)
3395                 return err;
3396
3397         for (i = 0; i <= IFLA_MAX; i++) {
3398                 if (!tb[i])
3399                         continue;
3400
3401                 switch (i) {
3402                 case IFLA_IFNAME:
3403                 case IFLA_ALT_IFNAME:
3404                 case IFLA_EXT_MASK:
3405                 case IFLA_TARGET_NETNSID:
3406                         break;
3407                 default:
3408                         NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3409                         return -EINVAL;
3410                 }
3411         }
3412
3413         return 0;
3414 }
3415
3416 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3417                         struct netlink_ext_ack *extack)
3418 {
3419         struct net *net = sock_net(skb->sk);
3420         struct net *tgt_net = net;
3421         struct ifinfomsg *ifm;
3422         struct nlattr *tb[IFLA_MAX+1];
3423         struct net_device *dev = NULL;
3424         struct sk_buff *nskb;
3425         int netnsid = -1;
3426         int err;
3427         u32 ext_filter_mask = 0;
3428
3429         err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3430         if (err < 0)
3431                 return err;
3432
3433         err = rtnl_ensure_unique_netns(tb, extack, true);
3434         if (err < 0)
3435                 return err;
3436
3437         if (tb[IFLA_TARGET_NETNSID]) {
3438                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3439                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3440                 if (IS_ERR(tgt_net))
3441                         return PTR_ERR(tgt_net);
3442         }
3443
3444         if (tb[IFLA_EXT_MASK])
3445                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3446
3447         err = -EINVAL;
3448         ifm = nlmsg_data(nlh);
3449         if (ifm->ifi_index > 0)
3450                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3451         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3452                 dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME],
3453                                    tb[IFLA_ALT_IFNAME], NULL);
3454         else
3455                 goto out;
3456
3457         err = -ENODEV;
3458         if (dev == NULL)
3459                 goto out;
3460
3461         err = -ENOBUFS;
3462         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3463         if (nskb == NULL)
3464                 goto out;
3465
3466         err = rtnl_fill_ifinfo(nskb, dev, net,
3467                                RTM_NEWLINK, NETLINK_CB(skb).portid,
3468                                nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3469                                0, NULL, 0, netnsid, GFP_KERNEL);
3470         if (err < 0) {
3471                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3472                 WARN_ON(err == -EMSGSIZE);
3473                 kfree_skb(nskb);
3474         } else
3475                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3476 out:
3477         if (netnsid >= 0)
3478                 put_net(tgt_net);
3479
3480         return err;
3481 }
3482
3483 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
3484                            bool *changed, struct netlink_ext_ack *extack)
3485 {
3486         char *alt_ifname;
3487         int err;
3488
3489         err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
3490         if (err)
3491                 return err;
3492
3493         alt_ifname = nla_data(attr);
3494         if (cmd == RTM_NEWLINKPROP) {
3495                 alt_ifname = kstrdup(alt_ifname, GFP_KERNEL);
3496                 if (!alt_ifname)
3497                         return -ENOMEM;
3498                 err = netdev_name_node_alt_create(dev, alt_ifname);
3499                 if (err) {
3500                         kfree(alt_ifname);
3501                         return err;
3502                 }
3503         } else if (cmd == RTM_DELLINKPROP) {
3504                 err = netdev_name_node_alt_destroy(dev, alt_ifname);
3505                 if (err)
3506                         return err;
3507         } else {
3508                 WARN_ON(1);
3509                 return 0;
3510         }
3511
3512         *changed = true;
3513         return 0;
3514 }
3515
3516 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
3517                          struct netlink_ext_ack *extack)
3518 {
3519         struct net *net = sock_net(skb->sk);
3520         struct nlattr *tb[IFLA_MAX + 1];
3521         struct net_device *dev;
3522         struct ifinfomsg *ifm;
3523         bool changed = false;
3524         struct nlattr *attr;
3525         int err, rem;
3526
3527         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3528         if (err)
3529                 return err;
3530
3531         err = rtnl_ensure_unique_netns(tb, extack, true);
3532         if (err)
3533                 return err;
3534
3535         ifm = nlmsg_data(nlh);
3536         if (ifm->ifi_index > 0)
3537                 dev = __dev_get_by_index(net, ifm->ifi_index);
3538         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3539                 dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
3540                                    tb[IFLA_ALT_IFNAME], NULL);
3541         else
3542                 return -EINVAL;
3543
3544         if (!dev)
3545                 return -ENODEV;
3546
3547         if (!tb[IFLA_PROP_LIST])
3548                 return 0;
3549
3550         nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
3551                 switch (nla_type(attr)) {
3552                 case IFLA_ALT_IFNAME:
3553                         err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
3554                         if (err)
3555                                 return err;
3556                         break;
3557                 }
3558         }
3559
3560         if (changed)
3561                 netdev_state_change(dev);
3562         return 0;
3563 }
3564
3565 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3566                             struct netlink_ext_ack *extack)
3567 {
3568         return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
3569 }
3570
3571 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3572                             struct netlink_ext_ack *extack)
3573 {
3574         return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
3575 }
3576
3577 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3578 {
3579         struct net *net = sock_net(skb->sk);
3580         struct net_device *dev;
3581         struct nlattr *tb[IFLA_MAX+1];
3582         u32 ext_filter_mask = 0;
3583         u16 min_ifinfo_dump_size = 0;
3584         int hdrlen;
3585
3586         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3587         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3588                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3589
3590         if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3591                 if (tb[IFLA_EXT_MASK])
3592                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3593         }
3594
3595         if (!ext_filter_mask)
3596                 return NLMSG_GOODSIZE;
3597         /*
3598          * traverse the list of net devices and compute the minimum
3599          * buffer size based upon the filter mask.
3600          */
3601         rcu_read_lock();
3602         for_each_netdev_rcu(net, dev) {
3603                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
3604                                              if_nlmsg_size(dev,
3605                                                            ext_filter_mask));
3606         }
3607         rcu_read_unlock();
3608
3609         return nlmsg_total_size(min_ifinfo_dump_size);
3610 }
3611
3612 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3613 {
3614         int idx;
3615         int s_idx = cb->family;
3616         int type = cb->nlh->nlmsg_type - RTM_BASE;
3617         int ret = 0;
3618
3619         if (s_idx == 0)
3620                 s_idx = 1;
3621
3622         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3623                 struct rtnl_link **tab;
3624                 struct rtnl_link *link;
3625                 rtnl_dumpit_func dumpit;
3626
3627                 if (idx < s_idx || idx == PF_PACKET)
3628                         continue;
3629
3630                 if (type < 0 || type >= RTM_NR_MSGTYPES)
3631                         continue;
3632
3633                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3634                 if (!tab)
3635                         continue;
3636
3637                 link = tab[type];
3638                 if (!link)
3639                         continue;
3640
3641                 dumpit = link->dumpit;
3642                 if (!dumpit)
3643                         continue;
3644
3645                 if (idx > s_idx) {
3646                         memset(&cb->args[0], 0, sizeof(cb->args));
3647                         cb->prev_seq = 0;
3648                         cb->seq = 0;
3649                 }
3650                 ret = dumpit(skb, cb);
3651                 if (ret)
3652                         break;
3653         }
3654         cb->family = idx;
3655
3656         return skb->len ? : ret;
3657 }
3658
3659 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3660                                        unsigned int change,
3661                                        u32 event, gfp_t flags, int *new_nsid,
3662                                        int new_ifindex)
3663 {
3664         struct net *net = dev_net(dev);
3665         struct sk_buff *skb;
3666         int err = -ENOBUFS;
3667         size_t if_info_size;
3668
3669         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3670         if (skb == NULL)
3671                 goto errout;
3672
3673         err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3674                                type, 0, 0, change, 0, 0, event,
3675                                new_nsid, new_ifindex, -1, flags);
3676         if (err < 0) {
3677                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3678                 WARN_ON(err == -EMSGSIZE);
3679                 kfree_skb(skb);
3680                 goto errout;
3681         }
3682         return skb;
3683 errout:
3684         if (err < 0)
3685                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3686         return NULL;
3687 }
3688
3689 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3690 {
3691         struct net *net = dev_net(dev);
3692
3693         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3694 }
3695
3696 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3697                                unsigned int change, u32 event,
3698                                gfp_t flags, int *new_nsid, int new_ifindex)
3699 {
3700         struct sk_buff *skb;
3701
3702         if (dev->reg_state != NETREG_REGISTERED)
3703                 return;
3704
3705         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3706                                      new_ifindex);
3707         if (skb)
3708                 rtmsg_ifinfo_send(skb, dev, flags);
3709 }
3710
3711 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3712                   gfp_t flags)
3713 {
3714         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3715                            NULL, 0);
3716 }
3717
3718 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3719                          gfp_t flags, int *new_nsid, int new_ifindex)
3720 {
3721         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3722                            new_nsid, new_ifindex);
3723 }
3724
3725 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3726                                    struct net_device *dev,
3727                                    u8 *addr, u16 vid, u32 pid, u32 seq,
3728                                    int type, unsigned int flags,
3729                                    int nlflags, u16 ndm_state)
3730 {
3731         struct nlmsghdr *nlh;
3732         struct ndmsg *ndm;
3733
3734         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3735         if (!nlh)
3736                 return -EMSGSIZE;
3737
3738         ndm = nlmsg_data(nlh);
3739         ndm->ndm_family  = AF_BRIDGE;
3740         ndm->ndm_pad1    = 0;
3741         ndm->ndm_pad2    = 0;
3742         ndm->ndm_flags   = flags;
3743         ndm->ndm_type    = 0;
3744         ndm->ndm_ifindex = dev->ifindex;
3745         ndm->ndm_state   = ndm_state;
3746
3747         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3748                 goto nla_put_failure;
3749         if (vid)
3750                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3751                         goto nla_put_failure;
3752
3753         nlmsg_end(skb, nlh);
3754         return 0;
3755
3756 nla_put_failure:
3757         nlmsg_cancel(skb, nlh);
3758         return -EMSGSIZE;
3759 }
3760
3761 static inline size_t rtnl_fdb_nlmsg_size(void)
3762 {
3763         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3764                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
3765                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
3766                0;
3767 }
3768
3769 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3770                             u16 ndm_state)
3771 {
3772         struct net *net = dev_net(dev);
3773         struct sk_buff *skb;
3774         int err = -ENOBUFS;
3775
3776         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3777         if (!skb)
3778                 goto errout;
3779
3780         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3781                                       0, 0, type, NTF_SELF, 0, ndm_state);
3782         if (err < 0) {
3783                 kfree_skb(skb);
3784                 goto errout;
3785         }
3786
3787         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3788         return;
3789 errout:
3790         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3791 }
3792
3793 /*
3794  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3795  */
3796 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3797                      struct nlattr *tb[],
3798                      struct net_device *dev,
3799                      const unsigned char *addr, u16 vid,
3800                      u16 flags)
3801 {
3802         int err = -EINVAL;
3803
3804         /* If aging addresses are supported device will need to
3805          * implement its own handler for this.
3806          */
3807         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3808                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3809                 return err;
3810         }
3811
3812         if (vid) {
3813                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3814                 return err;
3815         }
3816
3817         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3818                 err = dev_uc_add_excl(dev, addr);
3819         else if (is_multicast_ether_addr(addr))
3820                 err = dev_mc_add_excl(dev, addr);
3821
3822         /* Only return duplicate errors if NLM_F_EXCL is set */
3823         if (err == -EEXIST && !(flags & NLM_F_EXCL))
3824                 err = 0;
3825
3826         return err;
3827 }
3828 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3829
3830 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3831                          struct netlink_ext_ack *extack)
3832 {
3833         u16 vid = 0;
3834
3835         if (vlan_attr) {
3836                 if (nla_len(vlan_attr) != sizeof(u16)) {
3837                         NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3838                         return -EINVAL;
3839                 }
3840
3841                 vid = nla_get_u16(vlan_attr);
3842
3843                 if (!vid || vid >= VLAN_VID_MASK) {
3844                         NL_SET_ERR_MSG(extack, "invalid vlan id");
3845                         return -EINVAL;
3846                 }
3847         }
3848         *p_vid = vid;
3849         return 0;
3850 }
3851
3852 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3853                         struct netlink_ext_ack *extack)
3854 {
3855         struct net *net = sock_net(skb->sk);
3856         struct ndmsg *ndm;
3857         struct nlattr *tb[NDA_MAX+1];
3858         struct net_device *dev;
3859         u8 *addr;
3860         u16 vid;
3861         int err;
3862
3863         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3864                                      extack);
3865         if (err < 0)
3866                 return err;
3867
3868         ndm = nlmsg_data(nlh);
3869         if (ndm->ndm_ifindex == 0) {
3870                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3871                 return -EINVAL;
3872         }
3873
3874         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3875         if (dev == NULL) {
3876                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3877                 return -ENODEV;
3878         }
3879
3880         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3881                 NL_SET_ERR_MSG(extack, "invalid address");
3882                 return -EINVAL;
3883         }
3884
3885         if (dev->type != ARPHRD_ETHER) {
3886                 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
3887                 return -EINVAL;
3888         }
3889
3890         addr = nla_data(tb[NDA_LLADDR]);
3891
3892         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3893         if (err)
3894                 return err;
3895
3896         err = -EOPNOTSUPP;
3897
3898         /* Support fdb on master device the net/bridge default case */
3899         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3900             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3901                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3902                 const struct net_device_ops *ops = br_dev->netdev_ops;
3903
3904                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3905                                        nlh->nlmsg_flags, extack);
3906                 if (err)
3907                         goto out;
3908                 else
3909                         ndm->ndm_flags &= ~NTF_MASTER;
3910         }
3911
3912         /* Embedded bridge, macvlan, and any other device support */
3913         if ((ndm->ndm_flags & NTF_SELF)) {
3914                 if (dev->netdev_ops->ndo_fdb_add)
3915                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3916                                                            vid,
3917                                                            nlh->nlmsg_flags,
3918                                                            extack);
3919                 else
3920                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3921                                                nlh->nlmsg_flags);
3922
3923                 if (!err) {
3924                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3925                                         ndm->ndm_state);
3926                         ndm->ndm_flags &= ~NTF_SELF;
3927                 }
3928         }
3929 out:
3930         return err;
3931 }
3932
3933 /*
3934  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3935  */
3936 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3937                      struct nlattr *tb[],
3938                      struct net_device *dev,
3939                      const unsigned char *addr, u16 vid)
3940 {
3941         int err = -EINVAL;
3942
3943         /* If aging addresses are supported device will need to
3944          * implement its own handler for this.
3945          */
3946         if (!(ndm->ndm_state & NUD_PERMANENT)) {
3947                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3948                 return err;
3949         }
3950
3951         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3952                 err = dev_uc_del(dev, addr);
3953         else if (is_multicast_ether_addr(addr))
3954                 err = dev_mc_del(dev, addr);
3955
3956         return err;
3957 }
3958 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3959
3960 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3961                         struct netlink_ext_ack *extack)
3962 {
3963         struct net *net = sock_net(skb->sk);
3964         struct ndmsg *ndm;
3965         struct nlattr *tb[NDA_MAX+1];
3966         struct net_device *dev;
3967         int err = -EINVAL;
3968         __u8 *addr;
3969         u16 vid;
3970
3971         if (!netlink_capable(skb, CAP_NET_ADMIN))
3972                 return -EPERM;
3973
3974         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3975                                      extack);
3976         if (err < 0)
3977                 return err;
3978
3979         ndm = nlmsg_data(nlh);
3980         if (ndm->ndm_ifindex == 0) {
3981                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3982                 return -EINVAL;
3983         }
3984
3985         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3986         if (dev == NULL) {
3987                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3988                 return -ENODEV;
3989         }
3990
3991         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3992                 NL_SET_ERR_MSG(extack, "invalid address");
3993                 return -EINVAL;
3994         }
3995
3996         if (dev->type != ARPHRD_ETHER) {
3997                 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
3998                 return -EINVAL;
3999         }
4000
4001         addr = nla_data(tb[NDA_LLADDR]);
4002
4003         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4004         if (err)
4005                 return err;
4006
4007         err = -EOPNOTSUPP;
4008
4009         /* Support fdb on master device the net/bridge default case */
4010         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4011             (dev->priv_flags & IFF_BRIDGE_PORT)) {
4012                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4013                 const struct net_device_ops *ops = br_dev->netdev_ops;
4014
4015                 if (ops->ndo_fdb_del)
4016                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
4017
4018                 if (err)
4019                         goto out;
4020                 else
4021                         ndm->ndm_flags &= ~NTF_MASTER;
4022         }
4023
4024         /* Embedded bridge, macvlan, and any other device support */
4025         if (ndm->ndm_flags & NTF_SELF) {
4026                 if (dev->netdev_ops->ndo_fdb_del)
4027                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
4028                                                            vid);
4029                 else
4030                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
4031
4032                 if (!err) {
4033                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
4034                                         ndm->ndm_state);
4035                         ndm->ndm_flags &= ~NTF_SELF;
4036                 }
4037         }
4038 out:
4039         return err;
4040 }
4041
4042 static int nlmsg_populate_fdb(struct sk_buff *skb,
4043                               struct netlink_callback *cb,
4044                               struct net_device *dev,
4045                               int *idx,
4046                               struct netdev_hw_addr_list *list)
4047 {
4048         struct netdev_hw_addr *ha;
4049         int err;
4050         u32 portid, seq;
4051
4052         portid = NETLINK_CB(cb->skb).portid;
4053         seq = cb->nlh->nlmsg_seq;
4054
4055         list_for_each_entry(ha, &list->list, list) {
4056                 if (*idx < cb->args[2])
4057                         goto skip;
4058
4059                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
4060                                               portid, seq,
4061                                               RTM_NEWNEIGH, NTF_SELF,
4062                                               NLM_F_MULTI, NUD_PERMANENT);
4063                 if (err < 0)
4064                         return err;
4065 skip:
4066                 *idx += 1;
4067         }
4068         return 0;
4069 }
4070
4071 /**
4072  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
4073  * @skb: socket buffer to store message in
4074  * @cb: netlink callback
4075  * @dev: netdevice
4076  * @filter_dev: ignored
4077  * @idx: the number of FDB table entries dumped is added to *@idx
4078  *
4079  * Default netdevice operation to dump the existing unicast address list.
4080  * Returns number of addresses from list put in skb.
4081  */
4082 int ndo_dflt_fdb_dump(struct sk_buff *skb,
4083                       struct netlink_callback *cb,
4084                       struct net_device *dev,
4085                       struct net_device *filter_dev,
4086                       int *idx)
4087 {
4088         int err;
4089
4090         if (dev->type != ARPHRD_ETHER)
4091                 return -EINVAL;
4092
4093         netif_addr_lock_bh(dev);
4094         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
4095         if (err)
4096                 goto out;
4097         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
4098 out:
4099         netif_addr_unlock_bh(dev);
4100         return err;
4101 }
4102 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
4103
4104 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
4105                                  int *br_idx, int *brport_idx,
4106                                  struct netlink_ext_ack *extack)
4107 {
4108         struct nlattr *tb[NDA_MAX + 1];
4109         struct ndmsg *ndm;
4110         int err, i;
4111
4112         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4113                 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
4114                 return -EINVAL;
4115         }
4116
4117         ndm = nlmsg_data(nlh);
4118         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4119             ndm->ndm_flags || ndm->ndm_type) {
4120                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
4121                 return -EINVAL;
4122         }
4123
4124         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4125                                             NDA_MAX, NULL, extack);
4126         if (err < 0)
4127                 return err;
4128
4129         *brport_idx = ndm->ndm_ifindex;
4130         for (i = 0; i <= NDA_MAX; ++i) {
4131                 if (!tb[i])
4132                         continue;
4133
4134                 switch (i) {
4135                 case NDA_IFINDEX:
4136                         if (nla_len(tb[i]) != sizeof(u32)) {
4137                                 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
4138                                 return -EINVAL;
4139                         }
4140                         *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
4141                         break;
4142                 case NDA_MASTER:
4143                         if (nla_len(tb[i]) != sizeof(u32)) {
4144                                 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
4145                                 return -EINVAL;
4146                         }
4147                         *br_idx = nla_get_u32(tb[NDA_MASTER]);
4148                         break;
4149                 default:
4150                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
4151                         return -EINVAL;
4152                 }
4153         }
4154
4155         return 0;
4156 }
4157
4158 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
4159                                  int *br_idx, int *brport_idx,
4160                                  struct netlink_ext_ack *extack)
4161 {
4162         struct nlattr *tb[IFLA_MAX+1];
4163         int err;
4164
4165         /* A hack to preserve kernel<->userspace interface.
4166          * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
4167          * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
4168          * So, check for ndmsg with an optional u32 attribute (not used here).
4169          * Fortunately these sizes don't conflict with the size of ifinfomsg
4170          * with an optional attribute.
4171          */
4172         if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
4173             (nlmsg_len(nlh) != sizeof(struct ndmsg) +
4174              nla_attr_size(sizeof(u32)))) {
4175                 struct ifinfomsg *ifm;
4176
4177                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4178                                              tb, IFLA_MAX, ifla_policy,
4179                                              extack);
4180                 if (err < 0) {
4181                         return -EINVAL;
4182                 } else if (err == 0) {
4183                         if (tb[IFLA_MASTER])
4184                                 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
4185                 }
4186
4187                 ifm = nlmsg_data(nlh);
4188                 *brport_idx = ifm->ifi_index;
4189         }
4190         return 0;
4191 }
4192
4193 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
4194 {
4195         struct net_device *dev;
4196         struct net_device *br_dev = NULL;
4197         const struct net_device_ops *ops = NULL;
4198         const struct net_device_ops *cops = NULL;
4199         struct net *net = sock_net(skb->sk);
4200         struct hlist_head *head;
4201         int brport_idx = 0;
4202         int br_idx = 0;
4203         int h, s_h;
4204         int idx = 0, s_idx;
4205         int err = 0;
4206         int fidx = 0;
4207
4208         if (cb->strict_check)
4209                 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4210                                             cb->extack);
4211         else
4212                 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4213                                             cb->extack);
4214         if (err < 0)
4215                 return err;
4216
4217         if (br_idx) {
4218                 br_dev = __dev_get_by_index(net, br_idx);
4219                 if (!br_dev)
4220                         return -ENODEV;
4221
4222                 ops = br_dev->netdev_ops;
4223         }
4224
4225         s_h = cb->args[0];
4226         s_idx = cb->args[1];
4227
4228         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4229                 idx = 0;
4230                 head = &net->dev_index_head[h];
4231                 hlist_for_each_entry(dev, head, index_hlist) {
4232
4233                         if (brport_idx && (dev->ifindex != brport_idx))
4234                                 continue;
4235
4236                         if (!br_idx) { /* user did not specify a specific bridge */
4237                                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
4238                                         br_dev = netdev_master_upper_dev_get(dev);
4239                                         cops = br_dev->netdev_ops;
4240                                 }
4241                         } else {
4242                                 if (dev != br_dev &&
4243                                     !(dev->priv_flags & IFF_BRIDGE_PORT))
4244                                         continue;
4245
4246                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
4247                                     !(dev->priv_flags & IFF_EBRIDGE))
4248                                         continue;
4249                                 cops = ops;
4250                         }
4251
4252                         if (idx < s_idx)
4253                                 goto cont;
4254
4255                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
4256                                 if (cops && cops->ndo_fdb_dump) {
4257                                         err = cops->ndo_fdb_dump(skb, cb,
4258                                                                 br_dev, dev,
4259                                                                 &fidx);
4260                                         if (err == -EMSGSIZE)
4261                                                 goto out;
4262                                 }
4263                         }
4264
4265                         if (dev->netdev_ops->ndo_fdb_dump)
4266                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4267                                                                     dev, NULL,
4268                                                                     &fidx);
4269                         else
4270                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4271                                                         &fidx);
4272                         if (err == -EMSGSIZE)
4273                                 goto out;
4274
4275                         cops = NULL;
4276
4277                         /* reset fdb offset to 0 for rest of the interfaces */
4278                         cb->args[2] = 0;
4279                         fidx = 0;
4280 cont:
4281                         idx++;
4282                 }
4283         }
4284
4285 out:
4286         cb->args[0] = h;
4287         cb->args[1] = idx;
4288         cb->args[2] = fidx;
4289
4290         return skb->len;
4291 }
4292
4293 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4294                                 struct nlattr **tb, u8 *ndm_flags,
4295                                 int *br_idx, int *brport_idx, u8 **addr,
4296                                 u16 *vid, struct netlink_ext_ack *extack)
4297 {
4298         struct ndmsg *ndm;
4299         int err, i;
4300
4301         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4302                 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4303                 return -EINVAL;
4304         }
4305
4306         ndm = nlmsg_data(nlh);
4307         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4308             ndm->ndm_type) {
4309                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4310                 return -EINVAL;
4311         }
4312
4313         if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4314                 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4315                 return -EINVAL;
4316         }
4317
4318         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4319                                             NDA_MAX, nda_policy, extack);
4320         if (err < 0)
4321                 return err;
4322
4323         *ndm_flags = ndm->ndm_flags;
4324         *brport_idx = ndm->ndm_ifindex;
4325         for (i = 0; i <= NDA_MAX; ++i) {
4326                 if (!tb[i])
4327                         continue;
4328
4329                 switch (i) {
4330                 case NDA_MASTER:
4331                         *br_idx = nla_get_u32(tb[i]);
4332                         break;
4333                 case NDA_LLADDR:
4334                         if (nla_len(tb[i]) != ETH_ALEN) {
4335                                 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4336                                 return -EINVAL;
4337                         }
4338                         *addr = nla_data(tb[i]);
4339                         break;
4340                 case NDA_VLAN:
4341                         err = fdb_vid_parse(tb[i], vid, extack);
4342                         if (err)
4343                                 return err;
4344                         break;
4345                 case NDA_VNI:
4346                         break;
4347                 default:
4348                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4349                         return -EINVAL;
4350                 }
4351         }
4352
4353         return 0;
4354 }
4355
4356 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4357                         struct netlink_ext_ack *extack)
4358 {
4359         struct net_device *dev = NULL, *br_dev = NULL;
4360         const struct net_device_ops *ops = NULL;
4361         struct net *net = sock_net(in_skb->sk);
4362         struct nlattr *tb[NDA_MAX + 1];
4363         struct sk_buff *skb;
4364         int brport_idx = 0;
4365         u8 ndm_flags = 0;
4366         int br_idx = 0;
4367         u8 *addr = NULL;
4368         u16 vid = 0;
4369         int err;
4370
4371         err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4372                                    &brport_idx, &addr, &vid, extack);
4373         if (err < 0)
4374                 return err;
4375
4376         if (!addr) {
4377                 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4378                 return -EINVAL;
4379         }
4380
4381         if (brport_idx) {
4382                 dev = __dev_get_by_index(net, brport_idx);
4383                 if (!dev) {
4384                         NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4385                         return -ENODEV;
4386                 }
4387         }
4388
4389         if (br_idx) {
4390                 if (dev) {
4391                         NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4392                         return -EINVAL;
4393                 }
4394
4395                 br_dev = __dev_get_by_index(net, br_idx);
4396                 if (!br_dev) {
4397                         NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4398                         return -EINVAL;
4399                 }
4400                 ops = br_dev->netdev_ops;
4401         }
4402
4403         if (dev) {
4404                 if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4405                         if (!(dev->priv_flags & IFF_BRIDGE_PORT)) {
4406                                 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4407                                 return -EINVAL;
4408                         }
4409                         br_dev = netdev_master_upper_dev_get(dev);
4410                         if (!br_dev) {
4411                                 NL_SET_ERR_MSG(extack, "Master of device not found");
4412                                 return -EINVAL;
4413                         }
4414                         ops = br_dev->netdev_ops;
4415                 } else {
4416                         if (!(ndm_flags & NTF_SELF)) {
4417                                 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4418                                 return -EINVAL;
4419                         }
4420                         ops = dev->netdev_ops;
4421                 }
4422         }
4423
4424         if (!br_dev && !dev) {
4425                 NL_SET_ERR_MSG(extack, "No device specified");
4426                 return -ENODEV;
4427         }
4428
4429         if (!ops || !ops->ndo_fdb_get) {
4430                 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4431                 return -EOPNOTSUPP;
4432         }
4433
4434         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4435         if (!skb)
4436                 return -ENOBUFS;
4437
4438         if (br_dev)
4439                 dev = br_dev;
4440         err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4441                                NETLINK_CB(in_skb).portid,
4442                                nlh->nlmsg_seq, extack);
4443         if (err)
4444                 goto out;
4445
4446         return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4447 out:
4448         kfree_skb(skb);
4449         return err;
4450 }
4451
4452 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4453                                unsigned int attrnum, unsigned int flag)
4454 {
4455         if (mask & flag)
4456                 return nla_put_u8(skb, attrnum, !!(flags & flag));
4457         return 0;
4458 }
4459
4460 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4461                             struct net_device *dev, u16 mode,
4462                             u32 flags, u32 mask, int nlflags,
4463                             u32 filter_mask,
4464                             int (*vlan_fill)(struct sk_buff *skb,
4465                                              struct net_device *dev,
4466                                              u32 filter_mask))
4467 {
4468         struct nlmsghdr *nlh;
4469         struct ifinfomsg *ifm;
4470         struct nlattr *br_afspec;
4471         struct nlattr *protinfo;
4472         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4473         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4474         int err = 0;
4475
4476         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4477         if (nlh == NULL)
4478                 return -EMSGSIZE;
4479
4480         ifm = nlmsg_data(nlh);
4481         ifm->ifi_family = AF_BRIDGE;
4482         ifm->__ifi_pad = 0;
4483         ifm->ifi_type = dev->type;
4484         ifm->ifi_index = dev->ifindex;
4485         ifm->ifi_flags = dev_get_flags(dev);
4486         ifm->ifi_change = 0;
4487
4488
4489         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4490             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4491             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4492             (br_dev &&
4493              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4494             (dev->addr_len &&
4495              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4496             (dev->ifindex != dev_get_iflink(dev) &&
4497              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4498                 goto nla_put_failure;
4499
4500         br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4501         if (!br_afspec)
4502                 goto nla_put_failure;
4503
4504         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4505                 nla_nest_cancel(skb, br_afspec);
4506                 goto nla_put_failure;
4507         }
4508
4509         if (mode != BRIDGE_MODE_UNDEF) {
4510                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4511                         nla_nest_cancel(skb, br_afspec);
4512                         goto nla_put_failure;
4513                 }
4514         }
4515         if (vlan_fill) {
4516                 err = vlan_fill(skb, dev, filter_mask);
4517                 if (err) {
4518                         nla_nest_cancel(skb, br_afspec);
4519                         goto nla_put_failure;
4520                 }
4521         }
4522         nla_nest_end(skb, br_afspec);
4523
4524         protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4525         if (!protinfo)
4526                 goto nla_put_failure;
4527
4528         if (brport_nla_put_flag(skb, flags, mask,
4529                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4530             brport_nla_put_flag(skb, flags, mask,
4531                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4532             brport_nla_put_flag(skb, flags, mask,
4533                                 IFLA_BRPORT_FAST_LEAVE,
4534                                 BR_MULTICAST_FAST_LEAVE) ||
4535             brport_nla_put_flag(skb, flags, mask,
4536                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4537             brport_nla_put_flag(skb, flags, mask,
4538                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4539             brport_nla_put_flag(skb, flags, mask,
4540                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4541             brport_nla_put_flag(skb, flags, mask,
4542                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4543             brport_nla_put_flag(skb, flags, mask,
4544                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
4545                 nla_nest_cancel(skb, protinfo);
4546                 goto nla_put_failure;
4547         }
4548
4549         nla_nest_end(skb, protinfo);
4550
4551         nlmsg_end(skb, nlh);
4552         return 0;
4553 nla_put_failure:
4554         nlmsg_cancel(skb, nlh);
4555         return err ? err : -EMSGSIZE;
4556 }
4557 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4558
4559 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4560                                     bool strict_check, u32 *filter_mask,
4561                                     struct netlink_ext_ack *extack)
4562 {
4563         struct nlattr *tb[IFLA_MAX+1];
4564         int err, i;
4565
4566         if (strict_check) {
4567                 struct ifinfomsg *ifm;
4568
4569                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4570                         NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4571                         return -EINVAL;
4572                 }
4573
4574                 ifm = nlmsg_data(nlh);
4575                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4576                     ifm->ifi_change || ifm->ifi_index) {
4577                         NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4578                         return -EINVAL;
4579                 }
4580
4581                 err = nlmsg_parse_deprecated_strict(nlh,
4582                                                     sizeof(struct ifinfomsg),
4583                                                     tb, IFLA_MAX, ifla_policy,
4584                                                     extack);
4585         } else {
4586                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4587                                              tb, IFLA_MAX, ifla_policy,
4588                                              extack);
4589         }
4590         if (err < 0)
4591                 return err;
4592
4593         /* new attributes should only be added with strict checking */
4594         for (i = 0; i <= IFLA_MAX; ++i) {
4595                 if (!tb[i])
4596                         continue;
4597
4598                 switch (i) {
4599                 case IFLA_EXT_MASK:
4600                         *filter_mask = nla_get_u32(tb[i]);
4601                         break;
4602                 default:
4603                         if (strict_check) {
4604                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4605                                 return -EINVAL;
4606                         }
4607                 }
4608         }
4609
4610         return 0;
4611 }
4612
4613 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4614 {
4615         const struct nlmsghdr *nlh = cb->nlh;
4616         struct net *net = sock_net(skb->sk);
4617         struct net_device *dev;
4618         int idx = 0;
4619         u32 portid = NETLINK_CB(cb->skb).portid;
4620         u32 seq = nlh->nlmsg_seq;
4621         u32 filter_mask = 0;
4622         int err;
4623
4624         err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4625                                        cb->extack);
4626         if (err < 0 && cb->strict_check)
4627                 return err;
4628
4629         rcu_read_lock();
4630         for_each_netdev_rcu(net, dev) {
4631                 const struct net_device_ops *ops = dev->netdev_ops;
4632                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4633
4634                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4635                         if (idx >= cb->args[0]) {
4636                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
4637                                                 skb, portid, seq, dev,
4638                                                 filter_mask, NLM_F_MULTI);
4639                                 if (err < 0 && err != -EOPNOTSUPP) {
4640                                         if (likely(skb->len))
4641                                                 break;
4642
4643                                         goto out_err;
4644                                 }
4645                         }
4646                         idx++;
4647                 }
4648
4649                 if (ops->ndo_bridge_getlink) {
4650                         if (idx >= cb->args[0]) {
4651                                 err = ops->ndo_bridge_getlink(skb, portid,
4652                                                               seq, dev,
4653                                                               filter_mask,
4654                                                               NLM_F_MULTI);
4655                                 if (err < 0 && err != -EOPNOTSUPP) {
4656                                         if (likely(skb->len))
4657                                                 break;
4658
4659                                         goto out_err;
4660                                 }
4661                         }
4662                         idx++;
4663                 }
4664         }
4665         err = skb->len;
4666 out_err:
4667         rcu_read_unlock();
4668         cb->args[0] = idx;
4669
4670         return err;
4671 }
4672
4673 static inline size_t bridge_nlmsg_size(void)
4674 {
4675         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4676                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
4677                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
4678                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
4679                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
4680                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
4681                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
4682                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
4683                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
4684                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
4685                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
4686 }
4687
4688 static int rtnl_bridge_notify(struct net_device *dev)
4689 {
4690         struct net *net = dev_net(dev);
4691         struct sk_buff *skb;
4692         int err = -EOPNOTSUPP;
4693
4694         if (!dev->netdev_ops->ndo_bridge_getlink)
4695                 return 0;
4696
4697         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4698         if (!skb) {
4699                 err = -ENOMEM;
4700                 goto errout;
4701         }
4702
4703         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4704         if (err < 0)
4705                 goto errout;
4706
4707         if (!skb->len)
4708                 goto errout;
4709
4710         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4711         return 0;
4712 errout:
4713         WARN_ON(err == -EMSGSIZE);
4714         kfree_skb(skb);
4715         if (err)
4716                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4717         return err;
4718 }
4719
4720 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4721                                struct netlink_ext_ack *extack)
4722 {
4723         struct net *net = sock_net(skb->sk);
4724         struct ifinfomsg *ifm;
4725         struct net_device *dev;
4726         struct nlattr *br_spec, *attr = NULL;
4727         int rem, err = -EOPNOTSUPP;
4728         u16 flags = 0;
4729         bool have_flags = false;
4730
4731         if (nlmsg_len(nlh) < sizeof(*ifm))
4732                 return -EINVAL;
4733
4734         ifm = nlmsg_data(nlh);
4735         if (ifm->ifi_family != AF_BRIDGE)
4736                 return -EPFNOSUPPORT;
4737
4738         dev = __dev_get_by_index(net, ifm->ifi_index);
4739         if (!dev) {
4740                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4741                 return -ENODEV;
4742         }
4743
4744         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4745         if (br_spec) {
4746                 nla_for_each_nested(attr, br_spec, rem) {
4747                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4748                                 if (nla_len(attr) < sizeof(flags))
4749                                         return -EINVAL;
4750
4751                                 have_flags = true;
4752                                 flags = nla_get_u16(attr);
4753                                 break;
4754                         }
4755                 }
4756         }
4757
4758         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4759                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4760
4761                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4762                         err = -EOPNOTSUPP;
4763                         goto out;
4764                 }
4765
4766                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
4767                                                              extack);
4768                 if (err)
4769                         goto out;
4770
4771                 flags &= ~BRIDGE_FLAGS_MASTER;
4772         }
4773
4774         if ((flags & BRIDGE_FLAGS_SELF)) {
4775                 if (!dev->netdev_ops->ndo_bridge_setlink)
4776                         err = -EOPNOTSUPP;
4777                 else
4778                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4779                                                                   flags,
4780                                                                   extack);
4781                 if (!err) {
4782                         flags &= ~BRIDGE_FLAGS_SELF;
4783
4784                         /* Generate event to notify upper layer of bridge
4785                          * change
4786                          */
4787                         err = rtnl_bridge_notify(dev);
4788                 }
4789         }
4790
4791         if (have_flags)
4792                 memcpy(nla_data(attr), &flags, sizeof(flags));
4793 out:
4794         return err;
4795 }
4796
4797 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4798                                struct netlink_ext_ack *extack)
4799 {
4800         struct net *net = sock_net(skb->sk);
4801         struct ifinfomsg *ifm;
4802         struct net_device *dev;
4803         struct nlattr *br_spec, *attr = NULL;
4804         int rem, err = -EOPNOTSUPP;
4805         u16 flags = 0;
4806         bool have_flags = false;
4807
4808         if (nlmsg_len(nlh) < sizeof(*ifm))
4809                 return -EINVAL;
4810
4811         ifm = nlmsg_data(nlh);
4812         if (ifm->ifi_family != AF_BRIDGE)
4813                 return -EPFNOSUPPORT;
4814
4815         dev = __dev_get_by_index(net, ifm->ifi_index);
4816         if (!dev) {
4817                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4818                 return -ENODEV;
4819         }
4820
4821         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4822         if (br_spec) {
4823                 nla_for_each_nested(attr, br_spec, rem) {
4824                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4825                                 if (nla_len(attr) < sizeof(flags))
4826                                         return -EINVAL;
4827
4828                                 have_flags = true;
4829                                 flags = nla_get_u16(attr);
4830                                 break;
4831                         }
4832                 }
4833         }
4834
4835         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4836                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4837
4838                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4839                         err = -EOPNOTSUPP;
4840                         goto out;
4841                 }
4842
4843                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4844                 if (err)
4845                         goto out;
4846
4847                 flags &= ~BRIDGE_FLAGS_MASTER;
4848         }
4849
4850         if ((flags & BRIDGE_FLAGS_SELF)) {
4851                 if (!dev->netdev_ops->ndo_bridge_dellink)
4852                         err = -EOPNOTSUPP;
4853                 else
4854                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
4855                                                                   flags);
4856
4857                 if (!err) {
4858                         flags &= ~BRIDGE_FLAGS_SELF;
4859
4860                         /* Generate event to notify upper layer of bridge
4861                          * change
4862                          */
4863                         err = rtnl_bridge_notify(dev);
4864                 }
4865         }
4866
4867         if (have_flags)
4868                 memcpy(nla_data(attr), &flags, sizeof(flags));
4869 out:
4870         return err;
4871 }
4872
4873 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
4874 {
4875         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
4876                (!idxattr || idxattr == attrid);
4877 }
4878
4879 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
4880 static int rtnl_get_offload_stats_attr_size(int attr_id)
4881 {
4882         switch (attr_id) {
4883         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
4884                 return sizeof(struct rtnl_link_stats64);
4885         }
4886
4887         return 0;
4888 }
4889
4890 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
4891                                   int *prividx)
4892 {
4893         struct nlattr *attr = NULL;
4894         int attr_id, size;
4895         void *attr_data;
4896         int err;
4897
4898         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4899               dev->netdev_ops->ndo_get_offload_stats))
4900                 return -ENODATA;
4901
4902         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4903              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4904                 if (attr_id < *prividx)
4905                         continue;
4906
4907                 size = rtnl_get_offload_stats_attr_size(attr_id);
4908                 if (!size)
4909                         continue;
4910
4911                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4912                         continue;
4913
4914                 attr = nla_reserve_64bit(skb, attr_id, size,
4915                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
4916                 if (!attr)
4917                         goto nla_put_failure;
4918
4919                 attr_data = nla_data(attr);
4920                 memset(attr_data, 0, size);
4921                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
4922                                                              attr_data);
4923                 if (err)
4924                         goto get_offload_stats_failure;
4925         }
4926
4927         if (!attr)
4928                 return -ENODATA;
4929
4930         *prividx = 0;
4931         return 0;
4932
4933 nla_put_failure:
4934         err = -EMSGSIZE;
4935 get_offload_stats_failure:
4936         *prividx = attr_id;
4937         return err;
4938 }
4939
4940 static int rtnl_get_offload_stats_size(const struct net_device *dev)
4941 {
4942         int nla_size = 0;
4943         int attr_id;
4944         int size;
4945
4946         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4947               dev->netdev_ops->ndo_get_offload_stats))
4948                 return 0;
4949
4950         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4951              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4952                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4953                         continue;
4954                 size = rtnl_get_offload_stats_attr_size(attr_id);
4955                 nla_size += nla_total_size_64bit(size);
4956         }
4957
4958         if (nla_size != 0)
4959                 nla_size += nla_total_size(0);
4960
4961         return nla_size;
4962 }
4963
4964 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
4965                                int type, u32 pid, u32 seq, u32 change,
4966                                unsigned int flags, unsigned int filter_mask,
4967                                int *idxattr, int *prividx)
4968 {
4969         struct if_stats_msg *ifsm;
4970         struct nlmsghdr *nlh;
4971         struct nlattr *attr;
4972         int s_prividx = *prividx;
4973         int err;
4974
4975         ASSERT_RTNL();
4976
4977         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
4978         if (!nlh)
4979                 return -EMSGSIZE;
4980
4981         ifsm = nlmsg_data(nlh);
4982         ifsm->family = PF_UNSPEC;
4983         ifsm->pad1 = 0;
4984         ifsm->pad2 = 0;
4985         ifsm->ifindex = dev->ifindex;
4986         ifsm->filter_mask = filter_mask;
4987
4988         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
4989                 struct rtnl_link_stats64 *sp;
4990
4991                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
4992                                          sizeof(struct rtnl_link_stats64),
4993                                          IFLA_STATS_UNSPEC);
4994                 if (!attr)
4995                         goto nla_put_failure;
4996
4997                 sp = nla_data(attr);
4998                 dev_get_stats(dev, sp);
4999         }
5000
5001         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
5002                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5003
5004                 if (ops && ops->fill_linkxstats) {
5005                         *idxattr = IFLA_STATS_LINK_XSTATS;
5006                         attr = nla_nest_start_noflag(skb,
5007                                                      IFLA_STATS_LINK_XSTATS);
5008                         if (!attr)
5009                                 goto nla_put_failure;
5010
5011                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5012                         nla_nest_end(skb, attr);
5013                         if (err)
5014                                 goto nla_put_failure;
5015                         *idxattr = 0;
5016                 }
5017         }
5018
5019         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
5020                              *idxattr)) {
5021                 const struct rtnl_link_ops *ops = NULL;
5022                 const struct net_device *master;
5023
5024                 master = netdev_master_upper_dev_get(dev);
5025                 if (master)
5026                         ops = master->rtnl_link_ops;
5027                 if (ops && ops->fill_linkxstats) {
5028                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
5029                         attr = nla_nest_start_noflag(skb,
5030                                                      IFLA_STATS_LINK_XSTATS_SLAVE);
5031                         if (!attr)
5032                                 goto nla_put_failure;
5033
5034                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5035                         nla_nest_end(skb, attr);
5036                         if (err)
5037                                 goto nla_put_failure;
5038                         *idxattr = 0;
5039                 }
5040         }
5041
5042         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
5043                              *idxattr)) {
5044                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
5045                 attr = nla_nest_start_noflag(skb,
5046                                              IFLA_STATS_LINK_OFFLOAD_XSTATS);
5047                 if (!attr)
5048                         goto nla_put_failure;
5049
5050                 err = rtnl_get_offload_stats(skb, dev, prividx);
5051                 if (err == -ENODATA)
5052                         nla_nest_cancel(skb, attr);
5053                 else
5054                         nla_nest_end(skb, attr);
5055
5056                 if (err && err != -ENODATA)
5057                         goto nla_put_failure;
5058                 *idxattr = 0;
5059         }
5060
5061         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
5062                 struct rtnl_af_ops *af_ops;
5063
5064                 *idxattr = IFLA_STATS_AF_SPEC;
5065                 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
5066                 if (!attr)
5067                         goto nla_put_failure;
5068
5069                 rcu_read_lock();
5070                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5071                         if (af_ops->fill_stats_af) {
5072                                 struct nlattr *af;
5073                                 int err;
5074
5075                                 af = nla_nest_start_noflag(skb,
5076                                                            af_ops->family);
5077                                 if (!af) {
5078                                         rcu_read_unlock();
5079                                         goto nla_put_failure;
5080                                 }
5081                                 err = af_ops->fill_stats_af(skb, dev);
5082
5083                                 if (err == -ENODATA) {
5084                                         nla_nest_cancel(skb, af);
5085                                 } else if (err < 0) {
5086                                         rcu_read_unlock();
5087                                         goto nla_put_failure;
5088                                 }
5089
5090                                 nla_nest_end(skb, af);
5091                         }
5092                 }
5093                 rcu_read_unlock();
5094
5095                 nla_nest_end(skb, attr);
5096
5097                 *idxattr = 0;
5098         }
5099
5100         nlmsg_end(skb, nlh);
5101
5102         return 0;
5103
5104 nla_put_failure:
5105         /* not a multi message or no progress mean a real error */
5106         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
5107                 nlmsg_cancel(skb, nlh);
5108         else
5109                 nlmsg_end(skb, nlh);
5110
5111         return -EMSGSIZE;
5112 }
5113
5114 static size_t if_nlmsg_stats_size(const struct net_device *dev,
5115                                   u32 filter_mask)
5116 {
5117         size_t size = 0;
5118
5119         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
5120                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
5121
5122         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
5123                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5124                 int attr = IFLA_STATS_LINK_XSTATS;
5125
5126                 if (ops && ops->get_linkxstats_size) {
5127                         size += nla_total_size(ops->get_linkxstats_size(dev,
5128                                                                         attr));
5129                         /* for IFLA_STATS_LINK_XSTATS */
5130                         size += nla_total_size(0);
5131                 }
5132         }
5133
5134         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
5135                 struct net_device *_dev = (struct net_device *)dev;
5136                 const struct rtnl_link_ops *ops = NULL;
5137                 const struct net_device *master;
5138
5139                 /* netdev_master_upper_dev_get can't take const */
5140                 master = netdev_master_upper_dev_get(_dev);
5141                 if (master)
5142                         ops = master->rtnl_link_ops;
5143                 if (ops && ops->get_linkxstats_size) {
5144                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
5145
5146                         size += nla_total_size(ops->get_linkxstats_size(dev,
5147                                                                         attr));
5148                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
5149                         size += nla_total_size(0);
5150                 }
5151         }
5152
5153         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
5154                 size += rtnl_get_offload_stats_size(dev);
5155
5156         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
5157                 struct rtnl_af_ops *af_ops;
5158
5159                 /* for IFLA_STATS_AF_SPEC */
5160                 size += nla_total_size(0);
5161
5162                 rcu_read_lock();
5163                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5164                         if (af_ops->get_stats_af_size) {
5165                                 size += nla_total_size(
5166                                         af_ops->get_stats_af_size(dev));
5167
5168                                 /* for AF_* */
5169                                 size += nla_total_size(0);
5170                         }
5171                 }
5172                 rcu_read_unlock();
5173         }
5174
5175         return size;
5176 }
5177
5178 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
5179                                 bool is_dump, struct netlink_ext_ack *extack)
5180 {
5181         struct if_stats_msg *ifsm;
5182
5183         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
5184                 NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
5185                 return -EINVAL;
5186         }
5187
5188         if (!strict_check)
5189                 return 0;
5190
5191         ifsm = nlmsg_data(nlh);
5192
5193         /* only requests using strict checks can pass data to influence
5194          * the dump. The legacy exception is filter_mask.
5195          */
5196         if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
5197                 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
5198                 return -EINVAL;
5199         }
5200         if (nlmsg_attrlen(nlh, sizeof(*ifsm))) {
5201                 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
5202                 return -EINVAL;
5203         }
5204         if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5205                 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5206                 return -EINVAL;
5207         }
5208
5209         return 0;
5210 }
5211
5212 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5213                           struct netlink_ext_ack *extack)
5214 {
5215         struct net *net = sock_net(skb->sk);
5216         struct net_device *dev = NULL;
5217         int idxattr = 0, prividx = 0;
5218         struct if_stats_msg *ifsm;
5219         struct sk_buff *nskb;
5220         u32 filter_mask;
5221         int err;
5222
5223         err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5224                                    false, extack);
5225         if (err)
5226                 return err;
5227
5228         ifsm = nlmsg_data(nlh);
5229         if (ifsm->ifindex > 0)
5230                 dev = __dev_get_by_index(net, ifsm->ifindex);
5231         else
5232                 return -EINVAL;
5233
5234         if (!dev)
5235                 return -ENODEV;
5236
5237         filter_mask = ifsm->filter_mask;
5238         if (!filter_mask)
5239                 return -EINVAL;
5240
5241         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
5242         if (!nskb)
5243                 return -ENOBUFS;
5244
5245         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5246                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5247                                   0, filter_mask, &idxattr, &prividx);
5248         if (err < 0) {
5249                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5250                 WARN_ON(err == -EMSGSIZE);
5251                 kfree_skb(nskb);
5252         } else {
5253                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5254         }
5255
5256         return err;
5257 }
5258
5259 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5260 {
5261         struct netlink_ext_ack *extack = cb->extack;
5262         int h, s_h, err, s_idx, s_idxattr, s_prividx;
5263         struct net *net = sock_net(skb->sk);
5264         unsigned int flags = NLM_F_MULTI;
5265         struct if_stats_msg *ifsm;
5266         struct hlist_head *head;
5267         struct net_device *dev;
5268         u32 filter_mask = 0;
5269         int idx = 0;
5270
5271         s_h = cb->args[0];
5272         s_idx = cb->args[1];
5273         s_idxattr = cb->args[2];
5274         s_prividx = cb->args[3];
5275
5276         cb->seq = net->dev_base_seq;
5277
5278         err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5279         if (err)
5280                 return err;
5281
5282         ifsm = nlmsg_data(cb->nlh);
5283         filter_mask = ifsm->filter_mask;
5284         if (!filter_mask) {
5285                 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5286                 return -EINVAL;
5287         }
5288
5289         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5290                 idx = 0;
5291                 head = &net->dev_index_head[h];
5292                 hlist_for_each_entry(dev, head, index_hlist) {
5293                         if (idx < s_idx)
5294                                 goto cont;
5295                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5296                                                   NETLINK_CB(cb->skb).portid,
5297                                                   cb->nlh->nlmsg_seq, 0,
5298                                                   flags, filter_mask,
5299                                                   &s_idxattr, &s_prividx);
5300                         /* If we ran out of room on the first message,
5301                          * we're in trouble
5302                          */
5303                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5304
5305                         if (err < 0)
5306                                 goto out;
5307                         s_prividx = 0;
5308                         s_idxattr = 0;
5309                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5310 cont:
5311                         idx++;
5312                 }
5313         }
5314 out:
5315         cb->args[3] = s_prividx;
5316         cb->args[2] = s_idxattr;
5317         cb->args[1] = idx;
5318         cb->args[0] = h;
5319
5320         return skb->len;
5321 }
5322
5323 /* Process one rtnetlink message. */
5324
5325 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5326                              struct netlink_ext_ack *extack)
5327 {
5328         struct net *net = sock_net(skb->sk);
5329         struct rtnl_link *link;
5330         struct module *owner;
5331         int err = -EOPNOTSUPP;
5332         rtnl_doit_func doit;
5333         unsigned int flags;
5334         int kind;
5335         int family;
5336         int type;
5337
5338         type = nlh->nlmsg_type;
5339         if (type > RTM_MAX)
5340                 return -EOPNOTSUPP;
5341
5342         type -= RTM_BASE;
5343
5344         /* All the messages must have at least 1 byte length */
5345         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
5346                 return 0;
5347
5348         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
5349         kind = type&3;
5350
5351         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
5352                 return -EPERM;
5353
5354         rcu_read_lock();
5355         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
5356                 struct sock *rtnl;
5357                 rtnl_dumpit_func dumpit;
5358                 u16 min_dump_alloc = 0;
5359
5360                 link = rtnl_get_link(family, type);
5361                 if (!link || !link->dumpit) {
5362                         family = PF_UNSPEC;
5363                         link = rtnl_get_link(family, type);
5364                         if (!link || !link->dumpit)
5365                                 goto err_unlock;
5366                 }
5367                 owner = link->owner;
5368                 dumpit = link->dumpit;
5369
5370                 if (type == RTM_GETLINK - RTM_BASE)
5371                         min_dump_alloc = rtnl_calcit(skb, nlh);
5372
5373                 err = 0;
5374                 /* need to do this before rcu_read_unlock() */
5375                 if (!try_module_get(owner))
5376                         err = -EPROTONOSUPPORT;
5377
5378                 rcu_read_unlock();
5379
5380                 rtnl = net->rtnl;
5381                 if (err == 0) {
5382                         struct netlink_dump_control c = {
5383                                 .dump           = dumpit,
5384                                 .min_dump_alloc = min_dump_alloc,
5385                                 .module         = owner,
5386                         };
5387                         err = netlink_dump_start(rtnl, skb, nlh, &c);
5388                         /* netlink_dump_start() will keep a reference on
5389                          * module if dump is still in progress.
5390                          */
5391                         module_put(owner);
5392                 }
5393                 return err;
5394         }
5395
5396         link = rtnl_get_link(family, type);
5397         if (!link || !link->doit) {
5398                 family = PF_UNSPEC;
5399                 link = rtnl_get_link(PF_UNSPEC, type);
5400                 if (!link || !link->doit)
5401                         goto out_unlock;
5402         }
5403
5404         owner = link->owner;
5405         if (!try_module_get(owner)) {
5406                 err = -EPROTONOSUPPORT;
5407                 goto out_unlock;
5408         }
5409
5410         flags = link->flags;
5411         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
5412                 doit = link->doit;
5413                 rcu_read_unlock();
5414                 if (doit)
5415                         err = doit(skb, nlh, extack);
5416                 module_put(owner);
5417                 return err;
5418         }
5419         rcu_read_unlock();
5420
5421         rtnl_lock();
5422         link = rtnl_get_link(family, type);
5423         if (link && link->doit)
5424                 err = link->doit(skb, nlh, extack);
5425         rtnl_unlock();
5426
5427         module_put(owner);
5428
5429         return err;
5430
5431 out_unlock:
5432         rcu_read_unlock();
5433         return err;
5434
5435 err_unlock:
5436         rcu_read_unlock();
5437         return -EOPNOTSUPP;
5438 }
5439
5440 static void rtnetlink_rcv(struct sk_buff *skb)
5441 {
5442         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
5443 }
5444
5445 static int rtnetlink_bind(struct net *net, int group)
5446 {
5447         switch (group) {
5448         case RTNLGRP_IPV4_MROUTE_R:
5449         case RTNLGRP_IPV6_MROUTE_R:
5450                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5451                         return -EPERM;
5452                 break;
5453         }
5454         return 0;
5455 }
5456
5457 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
5458 {
5459         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5460
5461         switch (event) {
5462         case NETDEV_REBOOT:
5463         case NETDEV_CHANGEMTU:
5464         case NETDEV_CHANGEADDR:
5465         case NETDEV_CHANGENAME:
5466         case NETDEV_FEAT_CHANGE:
5467         case NETDEV_BONDING_FAILOVER:
5468         case NETDEV_POST_TYPE_CHANGE:
5469         case NETDEV_NOTIFY_PEERS:
5470         case NETDEV_CHANGEUPPER:
5471         case NETDEV_RESEND_IGMP:
5472         case NETDEV_CHANGEINFODATA:
5473         case NETDEV_CHANGELOWERSTATE:
5474         case NETDEV_CHANGE_TX_QUEUE_LEN:
5475                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
5476                                    GFP_KERNEL, NULL, 0);
5477                 break;
5478         default:
5479                 break;
5480         }
5481         return NOTIFY_DONE;
5482 }
5483
5484 static struct notifier_block rtnetlink_dev_notifier = {
5485         .notifier_call  = rtnetlink_event,
5486 };
5487
5488
5489 static int __net_init rtnetlink_net_init(struct net *net)
5490 {
5491         struct sock *sk;
5492         struct netlink_kernel_cfg cfg = {
5493                 .groups         = RTNLGRP_MAX,
5494                 .input          = rtnetlink_rcv,
5495                 .cb_mutex       = &rtnl_mutex,
5496                 .flags          = NL_CFG_F_NONROOT_RECV,
5497                 .bind           = rtnetlink_bind,
5498         };
5499
5500         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
5501         if (!sk)
5502                 return -ENOMEM;
5503         net->rtnl = sk;
5504         return 0;
5505 }
5506
5507 static void __net_exit rtnetlink_net_exit(struct net *net)
5508 {
5509         netlink_kernel_release(net->rtnl);
5510         net->rtnl = NULL;
5511 }
5512
5513 static struct pernet_operations rtnetlink_net_ops = {
5514         .init = rtnetlink_net_init,
5515         .exit = rtnetlink_net_exit,
5516 };
5517
5518 void __init rtnetlink_init(void)
5519 {
5520         if (register_pernet_subsys(&rtnetlink_net_ops))
5521                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
5522
5523         register_netdevice_notifier(&rtnetlink_dev_notifier);
5524
5525         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
5526                       rtnl_dump_ifinfo, 0);
5527         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
5528         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
5529         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
5530
5531         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
5532         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
5533         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
5534
5535         rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
5536         rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
5537
5538         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
5539         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
5540         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
5541
5542         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
5543         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
5544         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
5545
5546         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
5547                       0);
5548 }