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                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3053                 int err;
3054
3055                 err = dev_validate_mtu(dev, mtu, extack);
3056                 if (err) {
3057                         free_netdev(dev);
3058                         return ERR_PTR(err);
3059                 }
3060                 dev->mtu = mtu;
3061         }
3062         if (tb[IFLA_ADDRESS]) {
3063                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
3064                                 nla_len(tb[IFLA_ADDRESS]));
3065                 dev->addr_assign_type = NET_ADDR_SET;
3066         }
3067         if (tb[IFLA_BROADCAST])
3068                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
3069                                 nla_len(tb[IFLA_BROADCAST]));
3070         if (tb[IFLA_TXQLEN])
3071                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
3072         if (tb[IFLA_OPERSTATE])
3073                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
3074         if (tb[IFLA_LINKMODE])
3075                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
3076         if (tb[IFLA_GROUP])
3077                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
3078         if (tb[IFLA_GSO_MAX_SIZE])
3079                 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
3080         if (tb[IFLA_GSO_MAX_SEGS])
3081                 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
3082
3083         return dev;
3084 }
3085 EXPORT_SYMBOL(rtnl_create_link);
3086
3087 static int rtnl_group_changelink(const struct sk_buff *skb,
3088                 struct net *net, int group,
3089                 struct ifinfomsg *ifm,
3090                 struct netlink_ext_ack *extack,
3091                 struct nlattr **tb)
3092 {
3093         struct net_device *dev, *aux;
3094         int err;
3095
3096         for_each_netdev_safe(net, dev, aux) {
3097                 if (dev->group == group) {
3098                         err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
3099                         if (err < 0)
3100                                 return err;
3101                 }
3102         }
3103
3104         return 0;
3105 }
3106
3107 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3108                           struct nlattr **attr, struct netlink_ext_ack *extack)
3109 {
3110         struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3111         unsigned char name_assign_type = NET_NAME_USER;
3112         struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
3113         const struct rtnl_link_ops *m_ops = NULL;
3114         struct net_device *master_dev = NULL;
3115         struct net *net = sock_net(skb->sk);
3116         const struct rtnl_link_ops *ops;
3117         struct nlattr *tb[IFLA_MAX + 1];
3118         struct net *dest_net, *link_net;
3119         struct nlattr **slave_data;
3120         char kind[MODULE_NAME_LEN];
3121         struct net_device *dev;
3122         struct ifinfomsg *ifm;
3123         char ifname[IFNAMSIZ];
3124         struct nlattr **data;
3125         int err;
3126
3127 #ifdef CONFIG_MODULES
3128 replay:
3129 #endif
3130         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3131                                      ifla_policy, extack);
3132         if (err < 0)
3133                 return err;
3134
3135         err = rtnl_ensure_unique_netns(tb, extack, false);
3136         if (err < 0)
3137                 return err;
3138
3139         if (tb[IFLA_IFNAME])
3140                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3141         else
3142                 ifname[0] = '\0';
3143
3144         ifm = nlmsg_data(nlh);
3145         if (ifm->ifi_index > 0)
3146                 dev = __dev_get_by_index(net, ifm->ifi_index);
3147         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3148                 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
3149         else
3150                 dev = NULL;
3151
3152         if (dev) {
3153                 master_dev = netdev_master_upper_dev_get(dev);
3154                 if (master_dev)
3155                         m_ops = master_dev->rtnl_link_ops;
3156         }
3157
3158         err = validate_linkmsg(dev, tb);
3159         if (err < 0)
3160                 return err;
3161
3162         if (tb[IFLA_LINKINFO]) {
3163                 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3164                                                   tb[IFLA_LINKINFO],
3165                                                   ifla_info_policy, NULL);
3166                 if (err < 0)
3167                         return err;
3168         } else
3169                 memset(linkinfo, 0, sizeof(linkinfo));
3170
3171         if (linkinfo[IFLA_INFO_KIND]) {
3172                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3173                 ops = rtnl_link_ops_get(kind);
3174         } else {
3175                 kind[0] = '\0';
3176                 ops = NULL;
3177         }
3178
3179         data = NULL;
3180         if (ops) {
3181                 if (ops->maxtype > RTNL_MAX_TYPE)
3182                         return -EINVAL;
3183
3184                 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3185                         err = nla_parse_nested_deprecated(attr, ops->maxtype,
3186                                                           linkinfo[IFLA_INFO_DATA],
3187                                                           ops->policy, extack);
3188                         if (err < 0)
3189                                 return err;
3190                         data = attr;
3191                 }
3192                 if (ops->validate) {
3193                         err = ops->validate(tb, data, extack);
3194                         if (err < 0)
3195                                 return err;
3196                 }
3197         }
3198
3199         slave_data = NULL;
3200         if (m_ops) {
3201                 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3202                         return -EINVAL;
3203
3204                 if (m_ops->slave_maxtype &&
3205                     linkinfo[IFLA_INFO_SLAVE_DATA]) {
3206                         err = nla_parse_nested_deprecated(slave_attr,
3207                                                           m_ops->slave_maxtype,
3208                                                           linkinfo[IFLA_INFO_SLAVE_DATA],
3209                                                           m_ops->slave_policy,
3210                                                           extack);
3211                         if (err < 0)
3212                                 return err;
3213                         slave_data = slave_attr;
3214                 }
3215         }
3216
3217         if (dev) {
3218                 int status = 0;
3219
3220                 if (nlh->nlmsg_flags & NLM_F_EXCL)
3221                         return -EEXIST;
3222                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3223                         return -EOPNOTSUPP;
3224
3225                 if (linkinfo[IFLA_INFO_DATA]) {
3226                         if (!ops || ops != dev->rtnl_link_ops ||
3227                             !ops->changelink)
3228                                 return -EOPNOTSUPP;
3229
3230                         err = ops->changelink(dev, tb, data, extack);
3231                         if (err < 0)
3232                                 return err;
3233                         status |= DO_SETLINK_NOTIFY;
3234                 }
3235
3236                 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3237                         if (!m_ops || !m_ops->slave_changelink)
3238                                 return -EOPNOTSUPP;
3239
3240                         err = m_ops->slave_changelink(master_dev, dev, tb,
3241                                                       slave_data, extack);
3242                         if (err < 0)
3243                                 return err;
3244                         status |= DO_SETLINK_NOTIFY;
3245                 }
3246
3247                 return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
3248         }
3249
3250         if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3251                 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3252                         return rtnl_group_changelink(skb, net,
3253                                                 nla_get_u32(tb[IFLA_GROUP]),
3254                                                 ifm, extack, tb);
3255                 return -ENODEV;
3256         }
3257
3258         if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3259                 return -EOPNOTSUPP;
3260
3261         if (!ops) {
3262 #ifdef CONFIG_MODULES
3263                 if (kind[0]) {
3264                         __rtnl_unlock();
3265                         request_module("rtnl-link-%s", kind);
3266                         rtnl_lock();
3267                         ops = rtnl_link_ops_get(kind);
3268                         if (ops)
3269                                 goto replay;
3270                 }
3271 #endif
3272                 NL_SET_ERR_MSG(extack, "Unknown device type");
3273                 return -EOPNOTSUPP;
3274         }
3275
3276         if (!ops->setup)
3277                 return -EOPNOTSUPP;
3278
3279         if (!ifname[0]) {
3280                 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3281                 name_assign_type = NET_NAME_ENUM;
3282         }
3283
3284         dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3285         if (IS_ERR(dest_net))
3286                 return PTR_ERR(dest_net);
3287
3288         if (tb[IFLA_LINK_NETNSID]) {
3289                 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3290
3291                 link_net = get_net_ns_by_id(dest_net, id);
3292                 if (!link_net) {
3293                         NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3294                         err =  -EINVAL;
3295                         goto out;
3296                 }
3297                 err = -EPERM;
3298                 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3299                         goto out;
3300         } else {
3301                 link_net = NULL;
3302         }
3303
3304         dev = rtnl_create_link(link_net ? : dest_net, ifname,
3305                                name_assign_type, ops, tb, extack);
3306         if (IS_ERR(dev)) {
3307                 err = PTR_ERR(dev);
3308                 goto out;
3309         }
3310
3311         dev->ifindex = ifm->ifi_index;
3312
3313         if (ops->newlink) {
3314                 err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3315                 /* Drivers should call free_netdev() in ->destructor
3316                  * and unregister it on failure after registration
3317                  * so that device could be finally freed in rtnl_unlock.
3318                  */
3319                 if (err < 0) {
3320                         /* If device is not registered at all, free it now */
3321                         if (dev->reg_state == NETREG_UNINITIALIZED)
3322                                 free_netdev(dev);
3323                         goto out;
3324                 }
3325         } else {
3326                 err = register_netdevice(dev);
3327                 if (err < 0) {
3328                         free_netdev(dev);
3329                         goto out;
3330                 }
3331         }
3332         err = rtnl_configure_link(dev, ifm);
3333         if (err < 0)
3334                 goto out_unregister;
3335         if (link_net) {
3336                 err = dev_change_net_namespace(dev, dest_net, ifname);
3337                 if (err < 0)
3338                         goto out_unregister;
3339         }
3340         if (tb[IFLA_MASTER]) {
3341                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3342                 if (err)
3343                         goto out_unregister;
3344         }
3345 out:
3346         if (link_net)
3347                 put_net(link_net);
3348         put_net(dest_net);
3349         return err;
3350 out_unregister:
3351         if (ops->newlink) {
3352                 LIST_HEAD(list_kill);
3353
3354                 ops->dellink(dev, &list_kill);
3355                 unregister_netdevice_many(&list_kill);
3356         } else {
3357                 unregister_netdevice(dev);
3358         }
3359         goto out;
3360 }
3361
3362 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3363                         struct netlink_ext_ack *extack)
3364 {
3365         struct nlattr **attr;
3366         int ret;
3367
3368         attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
3369         if (!attr)
3370                 return -ENOMEM;
3371
3372         ret = __rtnl_newlink(skb, nlh, attr, extack);
3373         kfree(attr);
3374         return ret;
3375 }
3376
3377 static int rtnl_valid_getlink_req(struct sk_buff *skb,
3378                                   const struct nlmsghdr *nlh,
3379                                   struct nlattr **tb,
3380                                   struct netlink_ext_ack *extack)
3381 {
3382         struct ifinfomsg *ifm;
3383         int i, err;
3384
3385         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3386                 NL_SET_ERR_MSG(extack, "Invalid header for get link");
3387                 return -EINVAL;
3388         }
3389
3390         if (!netlink_strict_get_check(skb))
3391                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3392                                               ifla_policy, extack);
3393
3394         ifm = nlmsg_data(nlh);
3395         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3396             ifm->ifi_change) {
3397                 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3398                 return -EINVAL;
3399         }
3400
3401         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3402                                             ifla_policy, extack);
3403         if (err)
3404                 return err;
3405
3406         for (i = 0; i <= IFLA_MAX; i++) {
3407                 if (!tb[i])
3408                         continue;
3409
3410                 switch (i) {
3411                 case IFLA_IFNAME:
3412                 case IFLA_ALT_IFNAME:
3413                 case IFLA_EXT_MASK:
3414                 case IFLA_TARGET_NETNSID:
3415                         break;
3416                 default:
3417                         NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3418                         return -EINVAL;
3419                 }
3420         }
3421
3422         return 0;
3423 }
3424
3425 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3426                         struct netlink_ext_ack *extack)
3427 {
3428         struct net *net = sock_net(skb->sk);
3429         struct net *tgt_net = net;
3430         struct ifinfomsg *ifm;
3431         struct nlattr *tb[IFLA_MAX+1];
3432         struct net_device *dev = NULL;
3433         struct sk_buff *nskb;
3434         int netnsid = -1;
3435         int err;
3436         u32 ext_filter_mask = 0;
3437
3438         err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3439         if (err < 0)
3440                 return err;
3441
3442         err = rtnl_ensure_unique_netns(tb, extack, true);
3443         if (err < 0)
3444                 return err;
3445
3446         if (tb[IFLA_TARGET_NETNSID]) {
3447                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3448                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3449                 if (IS_ERR(tgt_net))
3450                         return PTR_ERR(tgt_net);
3451         }
3452
3453         if (tb[IFLA_EXT_MASK])
3454                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3455
3456         err = -EINVAL;
3457         ifm = nlmsg_data(nlh);
3458         if (ifm->ifi_index > 0)
3459                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3460         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3461                 dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME],
3462                                    tb[IFLA_ALT_IFNAME], NULL);
3463         else
3464                 goto out;
3465
3466         err = -ENODEV;
3467         if (dev == NULL)
3468                 goto out;
3469
3470         err = -ENOBUFS;
3471         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3472         if (nskb == NULL)
3473                 goto out;
3474
3475         err = rtnl_fill_ifinfo(nskb, dev, net,
3476                                RTM_NEWLINK, NETLINK_CB(skb).portid,
3477                                nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3478                                0, NULL, 0, netnsid, GFP_KERNEL);
3479         if (err < 0) {
3480                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3481                 WARN_ON(err == -EMSGSIZE);
3482                 kfree_skb(nskb);
3483         } else
3484                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3485 out:
3486         if (netnsid >= 0)
3487                 put_net(tgt_net);
3488
3489         return err;
3490 }
3491
3492 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
3493                            bool *changed, struct netlink_ext_ack *extack)
3494 {
3495         char *alt_ifname;
3496         int err;
3497
3498         err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
3499         if (err)
3500                 return err;
3501
3502         alt_ifname = nla_data(attr);
3503         if (cmd == RTM_NEWLINKPROP) {
3504                 alt_ifname = kstrdup(alt_ifname, GFP_KERNEL);
3505                 if (!alt_ifname)
3506                         return -ENOMEM;
3507                 err = netdev_name_node_alt_create(dev, alt_ifname);
3508                 if (err) {
3509                         kfree(alt_ifname);
3510                         return err;
3511                 }
3512         } else if (cmd == RTM_DELLINKPROP) {
3513                 err = netdev_name_node_alt_destroy(dev, alt_ifname);
3514                 if (err)
3515                         return err;
3516         } else {
3517                 WARN_ON(1);
3518                 return 0;
3519         }
3520
3521         *changed = true;
3522         return 0;
3523 }
3524
3525 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
3526                          struct netlink_ext_ack *extack)
3527 {
3528         struct net *net = sock_net(skb->sk);
3529         struct nlattr *tb[IFLA_MAX + 1];
3530         struct net_device *dev;
3531         struct ifinfomsg *ifm;
3532         bool changed = false;
3533         struct nlattr *attr;
3534         int err, rem;
3535
3536         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3537         if (err)
3538                 return err;
3539
3540         err = rtnl_ensure_unique_netns(tb, extack, true);
3541         if (err)
3542                 return err;
3543
3544         ifm = nlmsg_data(nlh);
3545         if (ifm->ifi_index > 0)
3546                 dev = __dev_get_by_index(net, ifm->ifi_index);
3547         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3548                 dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
3549                                    tb[IFLA_ALT_IFNAME], NULL);
3550         else
3551                 return -EINVAL;
3552
3553         if (!dev)
3554                 return -ENODEV;
3555
3556         if (!tb[IFLA_PROP_LIST])
3557                 return 0;
3558
3559         nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
3560                 switch (nla_type(attr)) {
3561                 case IFLA_ALT_IFNAME:
3562                         err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
3563                         if (err)
3564                                 return err;
3565                         break;
3566                 }
3567         }
3568
3569         if (changed)
3570                 netdev_state_change(dev);
3571         return 0;
3572 }
3573
3574 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3575                             struct netlink_ext_ack *extack)
3576 {
3577         return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
3578 }
3579
3580 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3581                             struct netlink_ext_ack *extack)
3582 {
3583         return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
3584 }
3585
3586 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3587 {
3588         struct net *net = sock_net(skb->sk);
3589         struct net_device *dev;
3590         struct nlattr *tb[IFLA_MAX+1];
3591         u32 ext_filter_mask = 0;
3592         u16 min_ifinfo_dump_size = 0;
3593         int hdrlen;
3594
3595         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3596         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3597                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3598
3599         if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3600                 if (tb[IFLA_EXT_MASK])
3601                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3602         }
3603
3604         if (!ext_filter_mask)
3605                 return NLMSG_GOODSIZE;
3606         /*
3607          * traverse the list of net devices and compute the minimum
3608          * buffer size based upon the filter mask.
3609          */
3610         rcu_read_lock();
3611         for_each_netdev_rcu(net, dev) {
3612                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
3613                                              if_nlmsg_size(dev,
3614                                                            ext_filter_mask));
3615         }
3616         rcu_read_unlock();
3617
3618         return nlmsg_total_size(min_ifinfo_dump_size);
3619 }
3620
3621 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3622 {
3623         int idx;
3624         int s_idx = cb->family;
3625         int type = cb->nlh->nlmsg_type - RTM_BASE;
3626         int ret = 0;
3627
3628         if (s_idx == 0)
3629                 s_idx = 1;
3630
3631         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3632                 struct rtnl_link **tab;
3633                 struct rtnl_link *link;
3634                 rtnl_dumpit_func dumpit;
3635
3636                 if (idx < s_idx || idx == PF_PACKET)
3637                         continue;
3638
3639                 if (type < 0 || type >= RTM_NR_MSGTYPES)
3640                         continue;
3641
3642                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3643                 if (!tab)
3644                         continue;
3645
3646                 link = tab[type];
3647                 if (!link)
3648                         continue;
3649
3650                 dumpit = link->dumpit;
3651                 if (!dumpit)
3652                         continue;
3653
3654                 if (idx > s_idx) {
3655                         memset(&cb->args[0], 0, sizeof(cb->args));
3656                         cb->prev_seq = 0;
3657                         cb->seq = 0;
3658                 }
3659                 ret = dumpit(skb, cb);
3660                 if (ret)
3661                         break;
3662         }
3663         cb->family = idx;
3664
3665         return skb->len ? : ret;
3666 }
3667
3668 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3669                                        unsigned int change,
3670                                        u32 event, gfp_t flags, int *new_nsid,
3671                                        int new_ifindex)
3672 {
3673         struct net *net = dev_net(dev);
3674         struct sk_buff *skb;
3675         int err = -ENOBUFS;
3676         size_t if_info_size;
3677
3678         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3679         if (skb == NULL)
3680                 goto errout;
3681
3682         err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3683                                type, 0, 0, change, 0, 0, event,
3684                                new_nsid, new_ifindex, -1, flags);
3685         if (err < 0) {
3686                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3687                 WARN_ON(err == -EMSGSIZE);
3688                 kfree_skb(skb);
3689                 goto errout;
3690         }
3691         return skb;
3692 errout:
3693         if (err < 0)
3694                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3695         return NULL;
3696 }
3697
3698 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3699 {
3700         struct net *net = dev_net(dev);
3701
3702         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3703 }
3704
3705 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3706                                unsigned int change, u32 event,
3707                                gfp_t flags, int *new_nsid, int new_ifindex)
3708 {
3709         struct sk_buff *skb;
3710
3711         if (dev->reg_state != NETREG_REGISTERED)
3712                 return;
3713
3714         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3715                                      new_ifindex);
3716         if (skb)
3717                 rtmsg_ifinfo_send(skb, dev, flags);
3718 }
3719
3720 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3721                   gfp_t flags)
3722 {
3723         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3724                            NULL, 0);
3725 }
3726
3727 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3728                          gfp_t flags, int *new_nsid, int new_ifindex)
3729 {
3730         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3731                            new_nsid, new_ifindex);
3732 }
3733
3734 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3735                                    struct net_device *dev,
3736                                    u8 *addr, u16 vid, u32 pid, u32 seq,
3737                                    int type, unsigned int flags,
3738                                    int nlflags, u16 ndm_state)
3739 {
3740         struct nlmsghdr *nlh;
3741         struct ndmsg *ndm;
3742
3743         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3744         if (!nlh)
3745                 return -EMSGSIZE;
3746
3747         ndm = nlmsg_data(nlh);
3748         ndm->ndm_family  = AF_BRIDGE;
3749         ndm->ndm_pad1    = 0;
3750         ndm->ndm_pad2    = 0;
3751         ndm->ndm_flags   = flags;
3752         ndm->ndm_type    = 0;
3753         ndm->ndm_ifindex = dev->ifindex;
3754         ndm->ndm_state   = ndm_state;
3755
3756         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3757                 goto nla_put_failure;
3758         if (vid)
3759                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3760                         goto nla_put_failure;
3761
3762         nlmsg_end(skb, nlh);
3763         return 0;
3764
3765 nla_put_failure:
3766         nlmsg_cancel(skb, nlh);
3767         return -EMSGSIZE;
3768 }
3769
3770 static inline size_t rtnl_fdb_nlmsg_size(void)
3771 {
3772         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3773                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
3774                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
3775                0;
3776 }
3777
3778 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3779                             u16 ndm_state)
3780 {
3781         struct net *net = dev_net(dev);
3782         struct sk_buff *skb;
3783         int err = -ENOBUFS;
3784
3785         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3786         if (!skb)
3787                 goto errout;
3788
3789         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3790                                       0, 0, type, NTF_SELF, 0, ndm_state);
3791         if (err < 0) {
3792                 kfree_skb(skb);
3793                 goto errout;
3794         }
3795
3796         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3797         return;
3798 errout:
3799         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3800 }
3801
3802 /*
3803  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3804  */
3805 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3806                      struct nlattr *tb[],
3807                      struct net_device *dev,
3808                      const unsigned char *addr, u16 vid,
3809                      u16 flags)
3810 {
3811         int err = -EINVAL;
3812
3813         /* If aging addresses are supported device will need to
3814          * implement its own handler for this.
3815          */
3816         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3817                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3818                 return err;
3819         }
3820
3821         if (vid) {
3822                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3823                 return err;
3824         }
3825
3826         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3827                 err = dev_uc_add_excl(dev, addr);
3828         else if (is_multicast_ether_addr(addr))
3829                 err = dev_mc_add_excl(dev, addr);
3830
3831         /* Only return duplicate errors if NLM_F_EXCL is set */
3832         if (err == -EEXIST && !(flags & NLM_F_EXCL))
3833                 err = 0;
3834
3835         return err;
3836 }
3837 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3838
3839 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3840                          struct netlink_ext_ack *extack)
3841 {
3842         u16 vid = 0;
3843
3844         if (vlan_attr) {
3845                 if (nla_len(vlan_attr) != sizeof(u16)) {
3846                         NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3847                         return -EINVAL;
3848                 }
3849
3850                 vid = nla_get_u16(vlan_attr);
3851
3852                 if (!vid || vid >= VLAN_VID_MASK) {
3853                         NL_SET_ERR_MSG(extack, "invalid vlan id");
3854                         return -EINVAL;
3855                 }
3856         }
3857         *p_vid = vid;
3858         return 0;
3859 }
3860
3861 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3862                         struct netlink_ext_ack *extack)
3863 {
3864         struct net *net = sock_net(skb->sk);
3865         struct ndmsg *ndm;
3866         struct nlattr *tb[NDA_MAX+1];
3867         struct net_device *dev;
3868         u8 *addr;
3869         u16 vid;
3870         int err;
3871
3872         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3873                                      extack);
3874         if (err < 0)
3875                 return err;
3876
3877         ndm = nlmsg_data(nlh);
3878         if (ndm->ndm_ifindex == 0) {
3879                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3880                 return -EINVAL;
3881         }
3882
3883         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3884         if (dev == NULL) {
3885                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3886                 return -ENODEV;
3887         }
3888
3889         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3890                 NL_SET_ERR_MSG(extack, "invalid address");
3891                 return -EINVAL;
3892         }
3893
3894         if (dev->type != ARPHRD_ETHER) {
3895                 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
3896                 return -EINVAL;
3897         }
3898
3899         addr = nla_data(tb[NDA_LLADDR]);
3900
3901         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3902         if (err)
3903                 return err;
3904
3905         err = -EOPNOTSUPP;
3906
3907         /* Support fdb on master device the net/bridge default case */
3908         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3909             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3910                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3911                 const struct net_device_ops *ops = br_dev->netdev_ops;
3912
3913                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3914                                        nlh->nlmsg_flags, extack);
3915                 if (err)
3916                         goto out;
3917                 else
3918                         ndm->ndm_flags &= ~NTF_MASTER;
3919         }
3920
3921         /* Embedded bridge, macvlan, and any other device support */
3922         if ((ndm->ndm_flags & NTF_SELF)) {
3923                 if (dev->netdev_ops->ndo_fdb_add)
3924                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3925                                                            vid,
3926                                                            nlh->nlmsg_flags,
3927                                                            extack);
3928                 else
3929                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3930                                                nlh->nlmsg_flags);
3931
3932                 if (!err) {
3933                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3934                                         ndm->ndm_state);
3935                         ndm->ndm_flags &= ~NTF_SELF;
3936                 }
3937         }
3938 out:
3939         return err;
3940 }
3941
3942 /*
3943  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3944  */
3945 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3946                      struct nlattr *tb[],
3947                      struct net_device *dev,
3948                      const unsigned char *addr, u16 vid)
3949 {
3950         int err = -EINVAL;
3951
3952         /* If aging addresses are supported device will need to
3953          * implement its own handler for this.
3954          */
3955         if (!(ndm->ndm_state & NUD_PERMANENT)) {
3956                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3957                 return err;
3958         }
3959
3960         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3961                 err = dev_uc_del(dev, addr);
3962         else if (is_multicast_ether_addr(addr))
3963                 err = dev_mc_del(dev, addr);
3964
3965         return err;
3966 }
3967 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3968
3969 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3970                         struct netlink_ext_ack *extack)
3971 {
3972         struct net *net = sock_net(skb->sk);
3973         struct ndmsg *ndm;
3974         struct nlattr *tb[NDA_MAX+1];
3975         struct net_device *dev;
3976         int err = -EINVAL;
3977         __u8 *addr;
3978         u16 vid;
3979
3980         if (!netlink_capable(skb, CAP_NET_ADMIN))
3981                 return -EPERM;
3982
3983         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3984                                      extack);
3985         if (err < 0)
3986                 return err;
3987
3988         ndm = nlmsg_data(nlh);
3989         if (ndm->ndm_ifindex == 0) {
3990                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3991                 return -EINVAL;
3992         }
3993
3994         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3995         if (dev == NULL) {
3996                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3997                 return -ENODEV;
3998         }
3999
4000         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4001                 NL_SET_ERR_MSG(extack, "invalid address");
4002                 return -EINVAL;
4003         }
4004
4005         if (dev->type != ARPHRD_ETHER) {
4006                 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
4007                 return -EINVAL;
4008         }
4009
4010         addr = nla_data(tb[NDA_LLADDR]);
4011
4012         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4013         if (err)
4014                 return err;
4015
4016         err = -EOPNOTSUPP;
4017
4018         /* Support fdb on master device the net/bridge default case */
4019         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4020             (dev->priv_flags & IFF_BRIDGE_PORT)) {
4021                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4022                 const struct net_device_ops *ops = br_dev->netdev_ops;
4023
4024                 if (ops->ndo_fdb_del)
4025                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
4026
4027                 if (err)
4028                         goto out;
4029                 else
4030                         ndm->ndm_flags &= ~NTF_MASTER;
4031         }
4032
4033         /* Embedded bridge, macvlan, and any other device support */
4034         if (ndm->ndm_flags & NTF_SELF) {
4035                 if (dev->netdev_ops->ndo_fdb_del)
4036                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
4037                                                            vid);
4038                 else
4039                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
4040
4041                 if (!err) {
4042                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
4043                                         ndm->ndm_state);
4044                         ndm->ndm_flags &= ~NTF_SELF;
4045                 }
4046         }
4047 out:
4048         return err;
4049 }
4050
4051 static int nlmsg_populate_fdb(struct sk_buff *skb,
4052                               struct netlink_callback *cb,
4053                               struct net_device *dev,
4054                               int *idx,
4055                               struct netdev_hw_addr_list *list)
4056 {
4057         struct netdev_hw_addr *ha;
4058         int err;
4059         u32 portid, seq;
4060
4061         portid = NETLINK_CB(cb->skb).portid;
4062         seq = cb->nlh->nlmsg_seq;
4063
4064         list_for_each_entry(ha, &list->list, list) {
4065                 if (*idx < cb->args[2])
4066                         goto skip;
4067
4068                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
4069                                               portid, seq,
4070                                               RTM_NEWNEIGH, NTF_SELF,
4071                                               NLM_F_MULTI, NUD_PERMANENT);
4072                 if (err < 0)
4073                         return err;
4074 skip:
4075                 *idx += 1;
4076         }
4077         return 0;
4078 }
4079
4080 /**
4081  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
4082  * @skb: socket buffer to store message in
4083  * @cb: netlink callback
4084  * @dev: netdevice
4085  * @filter_dev: ignored
4086  * @idx: the number of FDB table entries dumped is added to *@idx
4087  *
4088  * Default netdevice operation to dump the existing unicast address list.
4089  * Returns number of addresses from list put in skb.
4090  */
4091 int ndo_dflt_fdb_dump(struct sk_buff *skb,
4092                       struct netlink_callback *cb,
4093                       struct net_device *dev,
4094                       struct net_device *filter_dev,
4095                       int *idx)
4096 {
4097         int err;
4098
4099         if (dev->type != ARPHRD_ETHER)
4100                 return -EINVAL;
4101
4102         netif_addr_lock_bh(dev);
4103         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
4104         if (err)
4105                 goto out;
4106         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
4107 out:
4108         netif_addr_unlock_bh(dev);
4109         return err;
4110 }
4111 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
4112
4113 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
4114                                  int *br_idx, int *brport_idx,
4115                                  struct netlink_ext_ack *extack)
4116 {
4117         struct nlattr *tb[NDA_MAX + 1];
4118         struct ndmsg *ndm;
4119         int err, i;
4120
4121         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4122                 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
4123                 return -EINVAL;
4124         }
4125
4126         ndm = nlmsg_data(nlh);
4127         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4128             ndm->ndm_flags || ndm->ndm_type) {
4129                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
4130                 return -EINVAL;
4131         }
4132
4133         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4134                                             NDA_MAX, NULL, extack);
4135         if (err < 0)
4136                 return err;
4137
4138         *brport_idx = ndm->ndm_ifindex;
4139         for (i = 0; i <= NDA_MAX; ++i) {
4140                 if (!tb[i])
4141                         continue;
4142
4143                 switch (i) {
4144                 case NDA_IFINDEX:
4145                         if (nla_len(tb[i]) != sizeof(u32)) {
4146                                 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
4147                                 return -EINVAL;
4148                         }
4149                         *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
4150                         break;
4151                 case NDA_MASTER:
4152                         if (nla_len(tb[i]) != sizeof(u32)) {
4153                                 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
4154                                 return -EINVAL;
4155                         }
4156                         *br_idx = nla_get_u32(tb[NDA_MASTER]);
4157                         break;
4158                 default:
4159                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
4160                         return -EINVAL;
4161                 }
4162         }
4163
4164         return 0;
4165 }
4166
4167 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
4168                                  int *br_idx, int *brport_idx,
4169                                  struct netlink_ext_ack *extack)
4170 {
4171         struct nlattr *tb[IFLA_MAX+1];
4172         int err;
4173
4174         /* A hack to preserve kernel<->userspace interface.
4175          * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
4176          * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
4177          * So, check for ndmsg with an optional u32 attribute (not used here).
4178          * Fortunately these sizes don't conflict with the size of ifinfomsg
4179          * with an optional attribute.
4180          */
4181         if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
4182             (nlmsg_len(nlh) != sizeof(struct ndmsg) +
4183              nla_attr_size(sizeof(u32)))) {
4184                 struct ifinfomsg *ifm;
4185
4186                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4187                                              tb, IFLA_MAX, ifla_policy,
4188                                              extack);
4189                 if (err < 0) {
4190                         return -EINVAL;
4191                 } else if (err == 0) {
4192                         if (tb[IFLA_MASTER])
4193                                 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
4194                 }
4195
4196                 ifm = nlmsg_data(nlh);
4197                 *brport_idx = ifm->ifi_index;
4198         }
4199         return 0;
4200 }
4201
4202 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
4203 {
4204         struct net_device *dev;
4205         struct net_device *br_dev = NULL;
4206         const struct net_device_ops *ops = NULL;
4207         const struct net_device_ops *cops = NULL;
4208         struct net *net = sock_net(skb->sk);
4209         struct hlist_head *head;
4210         int brport_idx = 0;
4211         int br_idx = 0;
4212         int h, s_h;
4213         int idx = 0, s_idx;
4214         int err = 0;
4215         int fidx = 0;
4216
4217         if (cb->strict_check)
4218                 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4219                                             cb->extack);
4220         else
4221                 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4222                                             cb->extack);
4223         if (err < 0)
4224                 return err;
4225
4226         if (br_idx) {
4227                 br_dev = __dev_get_by_index(net, br_idx);
4228                 if (!br_dev)
4229                         return -ENODEV;
4230
4231                 ops = br_dev->netdev_ops;
4232         }
4233
4234         s_h = cb->args[0];
4235         s_idx = cb->args[1];
4236
4237         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4238                 idx = 0;
4239                 head = &net->dev_index_head[h];
4240                 hlist_for_each_entry(dev, head, index_hlist) {
4241
4242                         if (brport_idx && (dev->ifindex != brport_idx))
4243                                 continue;
4244
4245                         if (!br_idx) { /* user did not specify a specific bridge */
4246                                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
4247                                         br_dev = netdev_master_upper_dev_get(dev);
4248                                         cops = br_dev->netdev_ops;
4249                                 }
4250                         } else {
4251                                 if (dev != br_dev &&
4252                                     !(dev->priv_flags & IFF_BRIDGE_PORT))
4253                                         continue;
4254
4255                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
4256                                     !(dev->priv_flags & IFF_EBRIDGE))
4257                                         continue;
4258                                 cops = ops;
4259                         }
4260
4261                         if (idx < s_idx)
4262                                 goto cont;
4263
4264                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
4265                                 if (cops && cops->ndo_fdb_dump) {
4266                                         err = cops->ndo_fdb_dump(skb, cb,
4267                                                                 br_dev, dev,
4268                                                                 &fidx);
4269                                         if (err == -EMSGSIZE)
4270                                                 goto out;
4271                                 }
4272                         }
4273
4274                         if (dev->netdev_ops->ndo_fdb_dump)
4275                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4276                                                                     dev, NULL,
4277                                                                     &fidx);
4278                         else
4279                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4280                                                         &fidx);
4281                         if (err == -EMSGSIZE)
4282                                 goto out;
4283
4284                         cops = NULL;
4285
4286                         /* reset fdb offset to 0 for rest of the interfaces */
4287                         cb->args[2] = 0;
4288                         fidx = 0;
4289 cont:
4290                         idx++;
4291                 }
4292         }
4293
4294 out:
4295         cb->args[0] = h;
4296         cb->args[1] = idx;
4297         cb->args[2] = fidx;
4298
4299         return skb->len;
4300 }
4301
4302 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4303                                 struct nlattr **tb, u8 *ndm_flags,
4304                                 int *br_idx, int *brport_idx, u8 **addr,
4305                                 u16 *vid, struct netlink_ext_ack *extack)
4306 {
4307         struct ndmsg *ndm;
4308         int err, i;
4309
4310         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4311                 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4312                 return -EINVAL;
4313         }
4314
4315         ndm = nlmsg_data(nlh);
4316         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4317             ndm->ndm_type) {
4318                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4319                 return -EINVAL;
4320         }
4321
4322         if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4323                 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4324                 return -EINVAL;
4325         }
4326
4327         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4328                                             NDA_MAX, nda_policy, extack);
4329         if (err < 0)
4330                 return err;
4331
4332         *ndm_flags = ndm->ndm_flags;
4333         *brport_idx = ndm->ndm_ifindex;
4334         for (i = 0; i <= NDA_MAX; ++i) {
4335                 if (!tb[i])
4336                         continue;
4337
4338                 switch (i) {
4339                 case NDA_MASTER:
4340                         *br_idx = nla_get_u32(tb[i]);
4341                         break;
4342                 case NDA_LLADDR:
4343                         if (nla_len(tb[i]) != ETH_ALEN) {
4344                                 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4345                                 return -EINVAL;
4346                         }
4347                         *addr = nla_data(tb[i]);
4348                         break;
4349                 case NDA_VLAN:
4350                         err = fdb_vid_parse(tb[i], vid, extack);
4351                         if (err)
4352                                 return err;
4353                         break;
4354                 case NDA_VNI:
4355                         break;
4356                 default:
4357                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4358                         return -EINVAL;
4359                 }
4360         }
4361
4362         return 0;
4363 }
4364
4365 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4366                         struct netlink_ext_ack *extack)
4367 {
4368         struct net_device *dev = NULL, *br_dev = NULL;
4369         const struct net_device_ops *ops = NULL;
4370         struct net *net = sock_net(in_skb->sk);
4371         struct nlattr *tb[NDA_MAX + 1];
4372         struct sk_buff *skb;
4373         int brport_idx = 0;
4374         u8 ndm_flags = 0;
4375         int br_idx = 0;
4376         u8 *addr = NULL;
4377         u16 vid = 0;
4378         int err;
4379
4380         err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4381                                    &brport_idx, &addr, &vid, extack);
4382         if (err < 0)
4383                 return err;
4384
4385         if (!addr) {
4386                 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4387                 return -EINVAL;
4388         }
4389
4390         if (brport_idx) {
4391                 dev = __dev_get_by_index(net, brport_idx);
4392                 if (!dev) {
4393                         NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4394                         return -ENODEV;
4395                 }
4396         }
4397
4398         if (br_idx) {
4399                 if (dev) {
4400                         NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4401                         return -EINVAL;
4402                 }
4403
4404                 br_dev = __dev_get_by_index(net, br_idx);
4405                 if (!br_dev) {
4406                         NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4407                         return -EINVAL;
4408                 }
4409                 ops = br_dev->netdev_ops;
4410         }
4411
4412         if (dev) {
4413                 if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4414                         if (!(dev->priv_flags & IFF_BRIDGE_PORT)) {
4415                                 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4416                                 return -EINVAL;
4417                         }
4418                         br_dev = netdev_master_upper_dev_get(dev);
4419                         if (!br_dev) {
4420                                 NL_SET_ERR_MSG(extack, "Master of device not found");
4421                                 return -EINVAL;
4422                         }
4423                         ops = br_dev->netdev_ops;
4424                 } else {
4425                         if (!(ndm_flags & NTF_SELF)) {
4426                                 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4427                                 return -EINVAL;
4428                         }
4429                         ops = dev->netdev_ops;
4430                 }
4431         }
4432
4433         if (!br_dev && !dev) {
4434                 NL_SET_ERR_MSG(extack, "No device specified");
4435                 return -ENODEV;
4436         }
4437
4438         if (!ops || !ops->ndo_fdb_get) {
4439                 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4440                 return -EOPNOTSUPP;
4441         }
4442
4443         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4444         if (!skb)
4445                 return -ENOBUFS;
4446
4447         if (br_dev)
4448                 dev = br_dev;
4449         err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4450                                NETLINK_CB(in_skb).portid,
4451                                nlh->nlmsg_seq, extack);
4452         if (err)
4453                 goto out;
4454
4455         return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4456 out:
4457         kfree_skb(skb);
4458         return err;
4459 }
4460
4461 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4462                                unsigned int attrnum, unsigned int flag)
4463 {
4464         if (mask & flag)
4465                 return nla_put_u8(skb, attrnum, !!(flags & flag));
4466         return 0;
4467 }
4468
4469 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4470                             struct net_device *dev, u16 mode,
4471                             u32 flags, u32 mask, int nlflags,
4472                             u32 filter_mask,
4473                             int (*vlan_fill)(struct sk_buff *skb,
4474                                              struct net_device *dev,
4475                                              u32 filter_mask))
4476 {
4477         struct nlmsghdr *nlh;
4478         struct ifinfomsg *ifm;
4479         struct nlattr *br_afspec;
4480         struct nlattr *protinfo;
4481         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4482         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4483         int err = 0;
4484
4485         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4486         if (nlh == NULL)
4487                 return -EMSGSIZE;
4488
4489         ifm = nlmsg_data(nlh);
4490         ifm->ifi_family = AF_BRIDGE;
4491         ifm->__ifi_pad = 0;
4492         ifm->ifi_type = dev->type;
4493         ifm->ifi_index = dev->ifindex;
4494         ifm->ifi_flags = dev_get_flags(dev);
4495         ifm->ifi_change = 0;
4496
4497
4498         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4499             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4500             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4501             (br_dev &&
4502              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4503             (dev->addr_len &&
4504              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4505             (dev->ifindex != dev_get_iflink(dev) &&
4506              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4507                 goto nla_put_failure;
4508
4509         br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4510         if (!br_afspec)
4511                 goto nla_put_failure;
4512
4513         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4514                 nla_nest_cancel(skb, br_afspec);
4515                 goto nla_put_failure;
4516         }
4517
4518         if (mode != BRIDGE_MODE_UNDEF) {
4519                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4520                         nla_nest_cancel(skb, br_afspec);
4521                         goto nla_put_failure;
4522                 }
4523         }
4524         if (vlan_fill) {
4525                 err = vlan_fill(skb, dev, filter_mask);
4526                 if (err) {
4527                         nla_nest_cancel(skb, br_afspec);
4528                         goto nla_put_failure;
4529                 }
4530         }
4531         nla_nest_end(skb, br_afspec);
4532
4533         protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4534         if (!protinfo)
4535                 goto nla_put_failure;
4536
4537         if (brport_nla_put_flag(skb, flags, mask,
4538                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4539             brport_nla_put_flag(skb, flags, mask,
4540                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4541             brport_nla_put_flag(skb, flags, mask,
4542                                 IFLA_BRPORT_FAST_LEAVE,
4543                                 BR_MULTICAST_FAST_LEAVE) ||
4544             brport_nla_put_flag(skb, flags, mask,
4545                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4546             brport_nla_put_flag(skb, flags, mask,
4547                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4548             brport_nla_put_flag(skb, flags, mask,
4549                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4550             brport_nla_put_flag(skb, flags, mask,
4551                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4552             brport_nla_put_flag(skb, flags, mask,
4553                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
4554                 nla_nest_cancel(skb, protinfo);
4555                 goto nla_put_failure;
4556         }
4557
4558         nla_nest_end(skb, protinfo);
4559
4560         nlmsg_end(skb, nlh);
4561         return 0;
4562 nla_put_failure:
4563         nlmsg_cancel(skb, nlh);
4564         return err ? err : -EMSGSIZE;
4565 }
4566 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4567
4568 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4569                                     bool strict_check, u32 *filter_mask,
4570                                     struct netlink_ext_ack *extack)
4571 {
4572         struct nlattr *tb[IFLA_MAX+1];
4573         int err, i;
4574
4575         if (strict_check) {
4576                 struct ifinfomsg *ifm;
4577
4578                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4579                         NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4580                         return -EINVAL;
4581                 }
4582
4583                 ifm = nlmsg_data(nlh);
4584                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4585                     ifm->ifi_change || ifm->ifi_index) {
4586                         NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4587                         return -EINVAL;
4588                 }
4589
4590                 err = nlmsg_parse_deprecated_strict(nlh,
4591                                                     sizeof(struct ifinfomsg),
4592                                                     tb, IFLA_MAX, ifla_policy,
4593                                                     extack);
4594         } else {
4595                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4596                                              tb, IFLA_MAX, ifla_policy,
4597                                              extack);
4598         }
4599         if (err < 0)
4600                 return err;
4601
4602         /* new attributes should only be added with strict checking */
4603         for (i = 0; i <= IFLA_MAX; ++i) {
4604                 if (!tb[i])
4605                         continue;
4606
4607                 switch (i) {
4608                 case IFLA_EXT_MASK:
4609                         *filter_mask = nla_get_u32(tb[i]);
4610                         break;
4611                 default:
4612                         if (strict_check) {
4613                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4614                                 return -EINVAL;
4615                         }
4616                 }
4617         }
4618
4619         return 0;
4620 }
4621
4622 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4623 {
4624         const struct nlmsghdr *nlh = cb->nlh;
4625         struct net *net = sock_net(skb->sk);
4626         struct net_device *dev;
4627         int idx = 0;
4628         u32 portid = NETLINK_CB(cb->skb).portid;
4629         u32 seq = nlh->nlmsg_seq;
4630         u32 filter_mask = 0;
4631         int err;
4632
4633         err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4634                                        cb->extack);
4635         if (err < 0 && cb->strict_check)
4636                 return err;
4637
4638         rcu_read_lock();
4639         for_each_netdev_rcu(net, dev) {
4640                 const struct net_device_ops *ops = dev->netdev_ops;
4641                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4642
4643                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4644                         if (idx >= cb->args[0]) {
4645                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
4646                                                 skb, portid, seq, dev,
4647                                                 filter_mask, NLM_F_MULTI);
4648                                 if (err < 0 && err != -EOPNOTSUPP) {
4649                                         if (likely(skb->len))
4650                                                 break;
4651
4652                                         goto out_err;
4653                                 }
4654                         }
4655                         idx++;
4656                 }
4657
4658                 if (ops->ndo_bridge_getlink) {
4659                         if (idx >= cb->args[0]) {
4660                                 err = ops->ndo_bridge_getlink(skb, portid,
4661                                                               seq, dev,
4662                                                               filter_mask,
4663                                                               NLM_F_MULTI);
4664                                 if (err < 0 && err != -EOPNOTSUPP) {
4665                                         if (likely(skb->len))
4666                                                 break;
4667
4668                                         goto out_err;
4669                                 }
4670                         }
4671                         idx++;
4672                 }
4673         }
4674         err = skb->len;
4675 out_err:
4676         rcu_read_unlock();
4677         cb->args[0] = idx;
4678
4679         return err;
4680 }
4681
4682 static inline size_t bridge_nlmsg_size(void)
4683 {
4684         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4685                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
4686                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
4687                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
4688                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
4689                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
4690                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
4691                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
4692                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
4693                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
4694                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
4695 }
4696
4697 static int rtnl_bridge_notify(struct net_device *dev)
4698 {
4699         struct net *net = dev_net(dev);
4700         struct sk_buff *skb;
4701         int err = -EOPNOTSUPP;
4702
4703         if (!dev->netdev_ops->ndo_bridge_getlink)
4704                 return 0;
4705
4706         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4707         if (!skb) {
4708                 err = -ENOMEM;
4709                 goto errout;
4710         }
4711
4712         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4713         if (err < 0)
4714                 goto errout;
4715
4716         if (!skb->len)
4717                 goto errout;
4718
4719         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4720         return 0;
4721 errout:
4722         WARN_ON(err == -EMSGSIZE);
4723         kfree_skb(skb);
4724         if (err)
4725                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4726         return err;
4727 }
4728
4729 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4730                                struct netlink_ext_ack *extack)
4731 {
4732         struct net *net = sock_net(skb->sk);
4733         struct ifinfomsg *ifm;
4734         struct net_device *dev;
4735         struct nlattr *br_spec, *attr = NULL;
4736         int rem, err = -EOPNOTSUPP;
4737         u16 flags = 0;
4738         bool have_flags = false;
4739
4740         if (nlmsg_len(nlh) < sizeof(*ifm))
4741                 return -EINVAL;
4742
4743         ifm = nlmsg_data(nlh);
4744         if (ifm->ifi_family != AF_BRIDGE)
4745                 return -EPFNOSUPPORT;
4746
4747         dev = __dev_get_by_index(net, ifm->ifi_index);
4748         if (!dev) {
4749                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4750                 return -ENODEV;
4751         }
4752
4753         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4754         if (br_spec) {
4755                 nla_for_each_nested(attr, br_spec, rem) {
4756                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4757                                 if (nla_len(attr) < sizeof(flags))
4758                                         return -EINVAL;
4759
4760                                 have_flags = true;
4761                                 flags = nla_get_u16(attr);
4762                                 break;
4763                         }
4764                 }
4765         }
4766
4767         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4768                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4769
4770                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4771                         err = -EOPNOTSUPP;
4772                         goto out;
4773                 }
4774
4775                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
4776                                                              extack);
4777                 if (err)
4778                         goto out;
4779
4780                 flags &= ~BRIDGE_FLAGS_MASTER;
4781         }
4782
4783         if ((flags & BRIDGE_FLAGS_SELF)) {
4784                 if (!dev->netdev_ops->ndo_bridge_setlink)
4785                         err = -EOPNOTSUPP;
4786                 else
4787                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4788                                                                   flags,
4789                                                                   extack);
4790                 if (!err) {
4791                         flags &= ~BRIDGE_FLAGS_SELF;
4792
4793                         /* Generate event to notify upper layer of bridge
4794                          * change
4795                          */
4796                         err = rtnl_bridge_notify(dev);
4797                 }
4798         }
4799
4800         if (have_flags)
4801                 memcpy(nla_data(attr), &flags, sizeof(flags));
4802 out:
4803         return err;
4804 }
4805
4806 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4807                                struct netlink_ext_ack *extack)
4808 {
4809         struct net *net = sock_net(skb->sk);
4810         struct ifinfomsg *ifm;
4811         struct net_device *dev;
4812         struct nlattr *br_spec, *attr = NULL;
4813         int rem, err = -EOPNOTSUPP;
4814         u16 flags = 0;
4815         bool have_flags = false;
4816
4817         if (nlmsg_len(nlh) < sizeof(*ifm))
4818                 return -EINVAL;
4819
4820         ifm = nlmsg_data(nlh);
4821         if (ifm->ifi_family != AF_BRIDGE)
4822                 return -EPFNOSUPPORT;
4823
4824         dev = __dev_get_by_index(net, ifm->ifi_index);
4825         if (!dev) {
4826                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4827                 return -ENODEV;
4828         }
4829
4830         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4831         if (br_spec) {
4832                 nla_for_each_nested(attr, br_spec, rem) {
4833                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4834                                 if (nla_len(attr) < sizeof(flags))
4835                                         return -EINVAL;
4836
4837                                 have_flags = true;
4838                                 flags = nla_get_u16(attr);
4839                                 break;
4840                         }
4841                 }
4842         }
4843
4844         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4845                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4846
4847                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4848                         err = -EOPNOTSUPP;
4849                         goto out;
4850                 }
4851
4852                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4853                 if (err)
4854                         goto out;
4855
4856                 flags &= ~BRIDGE_FLAGS_MASTER;
4857         }
4858
4859         if ((flags & BRIDGE_FLAGS_SELF)) {
4860                 if (!dev->netdev_ops->ndo_bridge_dellink)
4861                         err = -EOPNOTSUPP;
4862                 else
4863                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
4864                                                                   flags);
4865
4866                 if (!err) {
4867                         flags &= ~BRIDGE_FLAGS_SELF;
4868
4869                         /* Generate event to notify upper layer of bridge
4870                          * change
4871                          */
4872                         err = rtnl_bridge_notify(dev);
4873                 }
4874         }
4875
4876         if (have_flags)
4877                 memcpy(nla_data(attr), &flags, sizeof(flags));
4878 out:
4879         return err;
4880 }
4881
4882 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
4883 {
4884         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
4885                (!idxattr || idxattr == attrid);
4886 }
4887
4888 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
4889 static int rtnl_get_offload_stats_attr_size(int attr_id)
4890 {
4891         switch (attr_id) {
4892         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
4893                 return sizeof(struct rtnl_link_stats64);
4894         }
4895
4896         return 0;
4897 }
4898
4899 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
4900                                   int *prividx)
4901 {
4902         struct nlattr *attr = NULL;
4903         int attr_id, size;
4904         void *attr_data;
4905         int err;
4906
4907         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4908               dev->netdev_ops->ndo_get_offload_stats))
4909                 return -ENODATA;
4910
4911         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4912              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4913                 if (attr_id < *prividx)
4914                         continue;
4915
4916                 size = rtnl_get_offload_stats_attr_size(attr_id);
4917                 if (!size)
4918                         continue;
4919
4920                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4921                         continue;
4922
4923                 attr = nla_reserve_64bit(skb, attr_id, size,
4924                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
4925                 if (!attr)
4926                         goto nla_put_failure;
4927
4928                 attr_data = nla_data(attr);
4929                 memset(attr_data, 0, size);
4930                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
4931                                                              attr_data);
4932                 if (err)
4933                         goto get_offload_stats_failure;
4934         }
4935
4936         if (!attr)
4937                 return -ENODATA;
4938
4939         *prividx = 0;
4940         return 0;
4941
4942 nla_put_failure:
4943         err = -EMSGSIZE;
4944 get_offload_stats_failure:
4945         *prividx = attr_id;
4946         return err;
4947 }
4948
4949 static int rtnl_get_offload_stats_size(const struct net_device *dev)
4950 {
4951         int nla_size = 0;
4952         int attr_id;
4953         int size;
4954
4955         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4956               dev->netdev_ops->ndo_get_offload_stats))
4957                 return 0;
4958
4959         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4960              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4961                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4962                         continue;
4963                 size = rtnl_get_offload_stats_attr_size(attr_id);
4964                 nla_size += nla_total_size_64bit(size);
4965         }
4966
4967         if (nla_size != 0)
4968                 nla_size += nla_total_size(0);
4969
4970         return nla_size;
4971 }
4972
4973 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
4974                                int type, u32 pid, u32 seq, u32 change,
4975                                unsigned int flags, unsigned int filter_mask,
4976                                int *idxattr, int *prividx)
4977 {
4978         struct if_stats_msg *ifsm;
4979         struct nlmsghdr *nlh;
4980         struct nlattr *attr;
4981         int s_prividx = *prividx;
4982         int err;
4983
4984         ASSERT_RTNL();
4985
4986         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
4987         if (!nlh)
4988                 return -EMSGSIZE;
4989
4990         ifsm = nlmsg_data(nlh);
4991         ifsm->family = PF_UNSPEC;
4992         ifsm->pad1 = 0;
4993         ifsm->pad2 = 0;
4994         ifsm->ifindex = dev->ifindex;
4995         ifsm->filter_mask = filter_mask;
4996
4997         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
4998                 struct rtnl_link_stats64 *sp;
4999
5000                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
5001                                          sizeof(struct rtnl_link_stats64),
5002                                          IFLA_STATS_UNSPEC);
5003                 if (!attr)
5004                         goto nla_put_failure;
5005
5006                 sp = nla_data(attr);
5007                 dev_get_stats(dev, sp);
5008         }
5009
5010         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
5011                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5012
5013                 if (ops && ops->fill_linkxstats) {
5014                         *idxattr = IFLA_STATS_LINK_XSTATS;
5015                         attr = nla_nest_start_noflag(skb,
5016                                                      IFLA_STATS_LINK_XSTATS);
5017                         if (!attr)
5018                                 goto nla_put_failure;
5019
5020                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5021                         nla_nest_end(skb, attr);
5022                         if (err)
5023                                 goto nla_put_failure;
5024                         *idxattr = 0;
5025                 }
5026         }
5027
5028         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
5029                              *idxattr)) {
5030                 const struct rtnl_link_ops *ops = NULL;
5031                 const struct net_device *master;
5032
5033                 master = netdev_master_upper_dev_get(dev);
5034                 if (master)
5035                         ops = master->rtnl_link_ops;
5036                 if (ops && ops->fill_linkxstats) {
5037                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
5038                         attr = nla_nest_start_noflag(skb,
5039                                                      IFLA_STATS_LINK_XSTATS_SLAVE);
5040                         if (!attr)
5041                                 goto nla_put_failure;
5042
5043                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5044                         nla_nest_end(skb, attr);
5045                         if (err)
5046                                 goto nla_put_failure;
5047                         *idxattr = 0;
5048                 }
5049         }
5050
5051         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
5052                              *idxattr)) {
5053                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
5054                 attr = nla_nest_start_noflag(skb,
5055                                              IFLA_STATS_LINK_OFFLOAD_XSTATS);
5056                 if (!attr)
5057                         goto nla_put_failure;
5058
5059                 err = rtnl_get_offload_stats(skb, dev, prividx);
5060                 if (err == -ENODATA)
5061                         nla_nest_cancel(skb, attr);
5062                 else
5063                         nla_nest_end(skb, attr);
5064
5065                 if (err && err != -ENODATA)
5066                         goto nla_put_failure;
5067                 *idxattr = 0;
5068         }
5069
5070         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
5071                 struct rtnl_af_ops *af_ops;
5072
5073                 *idxattr = IFLA_STATS_AF_SPEC;
5074                 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
5075                 if (!attr)
5076                         goto nla_put_failure;
5077
5078                 rcu_read_lock();
5079                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5080                         if (af_ops->fill_stats_af) {
5081                                 struct nlattr *af;
5082                                 int err;
5083
5084                                 af = nla_nest_start_noflag(skb,
5085                                                            af_ops->family);
5086                                 if (!af) {
5087                                         rcu_read_unlock();
5088                                         goto nla_put_failure;
5089                                 }
5090                                 err = af_ops->fill_stats_af(skb, dev);
5091
5092                                 if (err == -ENODATA) {
5093                                         nla_nest_cancel(skb, af);
5094                                 } else if (err < 0) {
5095                                         rcu_read_unlock();
5096                                         goto nla_put_failure;
5097                                 }
5098
5099                                 nla_nest_end(skb, af);
5100                         }
5101                 }
5102                 rcu_read_unlock();
5103
5104                 nla_nest_end(skb, attr);
5105
5106                 *idxattr = 0;
5107         }
5108
5109         nlmsg_end(skb, nlh);
5110
5111         return 0;
5112
5113 nla_put_failure:
5114         /* not a multi message or no progress mean a real error */
5115         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
5116                 nlmsg_cancel(skb, nlh);
5117         else
5118                 nlmsg_end(skb, nlh);
5119
5120         return -EMSGSIZE;
5121 }
5122
5123 static size_t if_nlmsg_stats_size(const struct net_device *dev,
5124                                   u32 filter_mask)
5125 {
5126         size_t size = 0;
5127
5128         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
5129                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
5130
5131         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
5132                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5133                 int attr = IFLA_STATS_LINK_XSTATS;
5134
5135                 if (ops && ops->get_linkxstats_size) {
5136                         size += nla_total_size(ops->get_linkxstats_size(dev,
5137                                                                         attr));
5138                         /* for IFLA_STATS_LINK_XSTATS */
5139                         size += nla_total_size(0);
5140                 }
5141         }
5142
5143         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
5144                 struct net_device *_dev = (struct net_device *)dev;
5145                 const struct rtnl_link_ops *ops = NULL;
5146                 const struct net_device *master;
5147
5148                 /* netdev_master_upper_dev_get can't take const */
5149                 master = netdev_master_upper_dev_get(_dev);
5150                 if (master)
5151                         ops = master->rtnl_link_ops;
5152                 if (ops && ops->get_linkxstats_size) {
5153                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
5154
5155                         size += nla_total_size(ops->get_linkxstats_size(dev,
5156                                                                         attr));
5157                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
5158                         size += nla_total_size(0);
5159                 }
5160         }
5161
5162         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
5163                 size += rtnl_get_offload_stats_size(dev);
5164
5165         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
5166                 struct rtnl_af_ops *af_ops;
5167
5168                 /* for IFLA_STATS_AF_SPEC */
5169                 size += nla_total_size(0);
5170
5171                 rcu_read_lock();
5172                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5173                         if (af_ops->get_stats_af_size) {
5174                                 size += nla_total_size(
5175                                         af_ops->get_stats_af_size(dev));
5176
5177                                 /* for AF_* */
5178                                 size += nla_total_size(0);
5179                         }
5180                 }
5181                 rcu_read_unlock();
5182         }
5183
5184         return size;
5185 }
5186
5187 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
5188                                 bool is_dump, struct netlink_ext_ack *extack)
5189 {
5190         struct if_stats_msg *ifsm;
5191
5192         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
5193                 NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
5194                 return -EINVAL;
5195         }
5196
5197         if (!strict_check)
5198                 return 0;
5199
5200         ifsm = nlmsg_data(nlh);
5201
5202         /* only requests using strict checks can pass data to influence
5203          * the dump. The legacy exception is filter_mask.
5204          */
5205         if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
5206                 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
5207                 return -EINVAL;
5208         }
5209         if (nlmsg_attrlen(nlh, sizeof(*ifsm))) {
5210                 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
5211                 return -EINVAL;
5212         }
5213         if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5214                 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5215                 return -EINVAL;
5216         }
5217
5218         return 0;
5219 }
5220
5221 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5222                           struct netlink_ext_ack *extack)
5223 {
5224         struct net *net = sock_net(skb->sk);
5225         struct net_device *dev = NULL;
5226         int idxattr = 0, prividx = 0;
5227         struct if_stats_msg *ifsm;
5228         struct sk_buff *nskb;
5229         u32 filter_mask;
5230         int err;
5231
5232         err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5233                                    false, extack);
5234         if (err)
5235                 return err;
5236
5237         ifsm = nlmsg_data(nlh);
5238         if (ifsm->ifindex > 0)
5239                 dev = __dev_get_by_index(net, ifsm->ifindex);
5240         else
5241                 return -EINVAL;
5242
5243         if (!dev)
5244                 return -ENODEV;
5245
5246         filter_mask = ifsm->filter_mask;
5247         if (!filter_mask)
5248                 return -EINVAL;
5249
5250         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
5251         if (!nskb)
5252                 return -ENOBUFS;
5253
5254         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5255                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5256                                   0, filter_mask, &idxattr, &prividx);
5257         if (err < 0) {
5258                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5259                 WARN_ON(err == -EMSGSIZE);
5260                 kfree_skb(nskb);
5261         } else {
5262                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5263         }
5264
5265         return err;
5266 }
5267
5268 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5269 {
5270         struct netlink_ext_ack *extack = cb->extack;
5271         int h, s_h, err, s_idx, s_idxattr, s_prividx;
5272         struct net *net = sock_net(skb->sk);
5273         unsigned int flags = NLM_F_MULTI;
5274         struct if_stats_msg *ifsm;
5275         struct hlist_head *head;
5276         struct net_device *dev;
5277         u32 filter_mask = 0;
5278         int idx = 0;
5279
5280         s_h = cb->args[0];
5281         s_idx = cb->args[1];
5282         s_idxattr = cb->args[2];
5283         s_prividx = cb->args[3];
5284
5285         cb->seq = net->dev_base_seq;
5286
5287         err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5288         if (err)
5289                 return err;
5290
5291         ifsm = nlmsg_data(cb->nlh);
5292         filter_mask = ifsm->filter_mask;
5293         if (!filter_mask) {
5294                 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5295                 return -EINVAL;
5296         }
5297
5298         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5299                 idx = 0;
5300                 head = &net->dev_index_head[h];
5301                 hlist_for_each_entry(dev, head, index_hlist) {
5302                         if (idx < s_idx)
5303                                 goto cont;
5304                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5305                                                   NETLINK_CB(cb->skb).portid,
5306                                                   cb->nlh->nlmsg_seq, 0,
5307                                                   flags, filter_mask,
5308                                                   &s_idxattr, &s_prividx);
5309                         /* If we ran out of room on the first message,
5310                          * we're in trouble
5311                          */
5312                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5313
5314                         if (err < 0)
5315                                 goto out;
5316                         s_prividx = 0;
5317                         s_idxattr = 0;
5318                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5319 cont:
5320                         idx++;
5321                 }
5322         }
5323 out:
5324         cb->args[3] = s_prividx;
5325         cb->args[2] = s_idxattr;
5326         cb->args[1] = idx;
5327         cb->args[0] = h;
5328
5329         return skb->len;
5330 }
5331
5332 /* Process one rtnetlink message. */
5333
5334 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5335                              struct netlink_ext_ack *extack)
5336 {
5337         struct net *net = sock_net(skb->sk);
5338         struct rtnl_link *link;
5339         struct module *owner;
5340         int err = -EOPNOTSUPP;
5341         rtnl_doit_func doit;
5342         unsigned int flags;
5343         int kind;
5344         int family;
5345         int type;
5346
5347         type = nlh->nlmsg_type;
5348         if (type > RTM_MAX)
5349                 return -EOPNOTSUPP;
5350
5351         type -= RTM_BASE;
5352
5353         /* All the messages must have at least 1 byte length */
5354         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
5355                 return 0;
5356
5357         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
5358         kind = type&3;
5359
5360         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
5361                 return -EPERM;
5362
5363         rcu_read_lock();
5364         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
5365                 struct sock *rtnl;
5366                 rtnl_dumpit_func dumpit;
5367                 u16 min_dump_alloc = 0;
5368
5369                 link = rtnl_get_link(family, type);
5370                 if (!link || !link->dumpit) {
5371                         family = PF_UNSPEC;
5372                         link = rtnl_get_link(family, type);
5373                         if (!link || !link->dumpit)
5374                                 goto err_unlock;
5375                 }
5376                 owner = link->owner;
5377                 dumpit = link->dumpit;
5378
5379                 if (type == RTM_GETLINK - RTM_BASE)
5380                         min_dump_alloc = rtnl_calcit(skb, nlh);
5381
5382                 err = 0;
5383                 /* need to do this before rcu_read_unlock() */
5384                 if (!try_module_get(owner))
5385                         err = -EPROTONOSUPPORT;
5386
5387                 rcu_read_unlock();
5388
5389                 rtnl = net->rtnl;
5390                 if (err == 0) {
5391                         struct netlink_dump_control c = {
5392                                 .dump           = dumpit,
5393                                 .min_dump_alloc = min_dump_alloc,
5394                                 .module         = owner,
5395                         };
5396                         err = netlink_dump_start(rtnl, skb, nlh, &c);
5397                         /* netlink_dump_start() will keep a reference on
5398                          * module if dump is still in progress.
5399                          */
5400                         module_put(owner);
5401                 }
5402                 return err;
5403         }
5404
5405         link = rtnl_get_link(family, type);
5406         if (!link || !link->doit) {
5407                 family = PF_UNSPEC;
5408                 link = rtnl_get_link(PF_UNSPEC, type);
5409                 if (!link || !link->doit)
5410                         goto out_unlock;
5411         }
5412
5413         owner = link->owner;
5414         if (!try_module_get(owner)) {
5415                 err = -EPROTONOSUPPORT;
5416                 goto out_unlock;
5417         }
5418
5419         flags = link->flags;
5420         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
5421                 doit = link->doit;
5422                 rcu_read_unlock();
5423                 if (doit)
5424                         err = doit(skb, nlh, extack);
5425                 module_put(owner);
5426                 return err;
5427         }
5428         rcu_read_unlock();
5429
5430         rtnl_lock();
5431         link = rtnl_get_link(family, type);
5432         if (link && link->doit)
5433                 err = link->doit(skb, nlh, extack);
5434         rtnl_unlock();
5435
5436         module_put(owner);
5437
5438         return err;
5439
5440 out_unlock:
5441         rcu_read_unlock();
5442         return err;
5443
5444 err_unlock:
5445         rcu_read_unlock();
5446         return -EOPNOTSUPP;
5447 }
5448
5449 static void rtnetlink_rcv(struct sk_buff *skb)
5450 {
5451         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
5452 }
5453
5454 static int rtnetlink_bind(struct net *net, int group)
5455 {
5456         switch (group) {
5457         case RTNLGRP_IPV4_MROUTE_R:
5458         case RTNLGRP_IPV6_MROUTE_R:
5459                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5460                         return -EPERM;
5461                 break;
5462         }
5463         return 0;
5464 }
5465
5466 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
5467 {
5468         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5469
5470         switch (event) {
5471         case NETDEV_REBOOT:
5472         case NETDEV_CHANGEMTU:
5473         case NETDEV_CHANGEADDR:
5474         case NETDEV_CHANGENAME:
5475         case NETDEV_FEAT_CHANGE:
5476         case NETDEV_BONDING_FAILOVER:
5477         case NETDEV_POST_TYPE_CHANGE:
5478         case NETDEV_NOTIFY_PEERS:
5479         case NETDEV_CHANGEUPPER:
5480         case NETDEV_RESEND_IGMP:
5481         case NETDEV_CHANGEINFODATA:
5482         case NETDEV_CHANGELOWERSTATE:
5483         case NETDEV_CHANGE_TX_QUEUE_LEN:
5484                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
5485                                    GFP_KERNEL, NULL, 0);
5486                 break;
5487         default:
5488                 break;
5489         }
5490         return NOTIFY_DONE;
5491 }
5492
5493 static struct notifier_block rtnetlink_dev_notifier = {
5494         .notifier_call  = rtnetlink_event,
5495 };
5496
5497
5498 static int __net_init rtnetlink_net_init(struct net *net)
5499 {
5500         struct sock *sk;
5501         struct netlink_kernel_cfg cfg = {
5502                 .groups         = RTNLGRP_MAX,
5503                 .input          = rtnetlink_rcv,
5504                 .cb_mutex       = &rtnl_mutex,
5505                 .flags          = NL_CFG_F_NONROOT_RECV,
5506                 .bind           = rtnetlink_bind,
5507         };
5508
5509         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
5510         if (!sk)
5511                 return -ENOMEM;
5512         net->rtnl = sk;
5513         return 0;
5514 }
5515
5516 static void __net_exit rtnetlink_net_exit(struct net *net)
5517 {
5518         netlink_kernel_release(net->rtnl);
5519         net->rtnl = NULL;
5520 }
5521
5522 static struct pernet_operations rtnetlink_net_ops = {
5523         .init = rtnetlink_net_init,
5524         .exit = rtnetlink_net_exit,
5525 };
5526
5527 void __init rtnetlink_init(void)
5528 {
5529         if (register_pernet_subsys(&rtnetlink_net_ops))
5530                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
5531
5532         register_netdevice_notifier(&rtnetlink_dev_notifier);
5533
5534         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
5535                       rtnl_dump_ifinfo, 0);
5536         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
5537         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
5538         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
5539
5540         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
5541         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
5542         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
5543
5544         rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
5545         rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
5546
5547         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
5548         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
5549         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
5550
5551         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
5552         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
5553         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
5554
5555         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
5556                       0);
5557 }