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_TESTING ||
 833                      operstate == IF_OPER_UNKNOWN) &&
 834                     !netif_dormant(dev) && !netif_testing(dev))
 835                         operstate = IF_OPER_UP;
 836                 break;
 837
 838         case IF_OPER_TESTING:
 839                 if (operstate == IF_OPER_UP ||
 840                     operstate == IF_OPER_UNKNOWN)
 841                         operstate = IF_OPER_TESTING;
 842                 break;
 843
 844         case IF_OPER_DORMANT:
 845                 if (operstate == IF_OPER_UP ||
 846                     operstate == IF_OPER_UNKNOWN)
 847                         operstate = IF_OPER_DORMANT;
 848                 break;
 849         }
 850
 851         if (dev->operstate != operstate) {
 852                 write_lock_bh(&dev_base_lock);
 853                 dev->operstate = operstate;
 854                 write_unlock_bh(&dev_base_lock);
 855                 netdev_state_change(dev);
 856         }
 857 }
 858
 859 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 860 {
 861         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 862                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 863 }
 864
 865 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 866                                            const struct ifinfomsg *ifm)
 867 {
 868         unsigned int flags = ifm->ifi_flags;
 869
 870         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 871         if (ifm->ifi_change)
 872                 flags = (flags & ifm->ifi_change) |
 873                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 874
 875         return flags;
 876 }
 877
 878 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 879                                  const struct rtnl_link_stats64 *b)
 880 {
 881         a->rx_packets = b->rx_packets;
 882         a->tx_packets = b->tx_packets;
 883         a->rx_bytes = b->rx_bytes;
 884         a->tx_bytes = b->tx_bytes;
 885         a->rx_errors = b->rx_errors;
 886         a->tx_errors = b->tx_errors;
 887         a->rx_dropped = b->rx_dropped;
 888         a->tx_dropped = b->tx_dropped;
 889
 890         a->multicast = b->multicast;
 891         a->collisions = b->collisions;
 892
 893         a->rx_length_errors = b->rx_length_errors;
 894         a->rx_over_errors = b->rx_over_errors;
 895         a->rx_crc_errors = b->rx_crc_errors;
 896         a->rx_frame_errors = b->rx_frame_errors;
 897         a->rx_fifo_errors = b->rx_fifo_errors;
 898         a->rx_missed_errors = b->rx_missed_errors;
 899
 900         a->tx_aborted_errors = b->tx_aborted_errors;
 901         a->tx_carrier_errors = b->tx_carrier_errors;
 902         a->tx_fifo_errors = b->tx_fifo_errors;
 903         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 904         a->tx_window_errors = b->tx_window_errors;
 905
 906         a->rx_compressed = b->rx_compressed;
 907         a->tx_compressed = b->tx_compressed;
 908
 909         a->rx_nohandler = b->rx_nohandler;
 910 }
 911
 912 /* All VF info */
 913 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 914                                    u32 ext_filter_mask)
 915 {
 916         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
 917                 int num_vfs = dev_num_vf(dev->dev.parent);
 918                 size_t size = nla_total_size(0);
 919                 size += num_vfs *
 920                         (nla_total_size(0) +
 921                          nla_total_size(sizeof(struct ifla_vf_mac)) +
 922                          nla_total_size(sizeof(struct ifla_vf_broadcast)) +
 923                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 924                          nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
 925                          nla_total_size(MAX_VLAN_LIST_LEN *
 926                                         sizeof(struct ifla_vf_vlan_info)) +
 927                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 928                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 929                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 930                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 931                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 932                          nla_total_size(0) + /* nest IFLA_VF_STATS */
 933                          /* IFLA_VF_STATS_RX_PACKETS */
 934                          nla_total_size_64bit(sizeof(__u64)) +
 935                          /* IFLA_VF_STATS_TX_PACKETS */
 936                          nla_total_size_64bit(sizeof(__u64)) +
 937                          /* IFLA_VF_STATS_RX_BYTES */
 938                          nla_total_size_64bit(sizeof(__u64)) +
 939                          /* IFLA_VF_STATS_TX_BYTES */
 940                          nla_total_size_64bit(sizeof(__u64)) +
 941                          /* IFLA_VF_STATS_BROADCAST */
 942                          nla_total_size_64bit(sizeof(__u64)) +
 943                          /* IFLA_VF_STATS_MULTICAST */
 944                          nla_total_size_64bit(sizeof(__u64)) +
 945                          /* IFLA_VF_STATS_RX_DROPPED */
 946                          nla_total_size_64bit(sizeof(__u64)) +
 947                          /* IFLA_VF_STATS_TX_DROPPED */
 948                          nla_total_size_64bit(sizeof(__u64)) +
 949                          nla_total_size(sizeof(struct ifla_vf_trust)));
 950                 return size;
 951         } else
 952                 return 0;
 953 }
 954
 955 static size_t rtnl_port_size(const struct net_device *dev,
 956                              u32 ext_filter_mask)
 957 {
 958         size_t port_size = nla_total_size(4)            /* PORT_VF */
 959                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 960                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 961                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 962                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 963                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 964         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 965         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 966                 + port_size;
 967         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 968                 + port_size;
 969
 970         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 971             !(ext_filter_mask & RTEXT_FILTER_VF))
 972                 return 0;
 973         if (dev_num_vf(dev->dev.parent))
 974                 return port_self_size + vf_ports_size +
 975                         vf_port_size * dev_num_vf(dev->dev.parent);
 976         else
 977                 return port_self_size;
 978 }
 979
 980 static size_t rtnl_xdp_size(void)
 981 {
 982         size_t xdp_size = nla_total_size(0) +   /* nest IFLA_XDP */
 983                           nla_total_size(1) +   /* XDP_ATTACHED */
 984                           nla_total_size(4) +   /* XDP_PROG_ID (or 1st mode) */
 985                           nla_total_size(4);    /* XDP_<mode>_PROG_ID */
 986
 987         return xdp_size;
 988 }
 989
 990 static size_t rtnl_prop_list_size(const struct net_device *dev)
 991 {
 992         struct netdev_name_node *name_node;
 993         size_t size;
 994
 995         if (list_empty(&dev->name_node->list))
 996                 return 0;
 997         size = nla_total_size(0);
 998         list_for_each_entry(name_node, &dev->name_node->list, list)
 999                 size += nla_total_size(ALTIFNAMSIZ);
1000         return size;
1001 }
1002
1003 static noinline size_t if_nlmsg_size(const struct net_device *dev,
1004                                      u32 ext_filter_mask)
1005 {
1006         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
1007                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
1008                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
1009                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
1010                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
1011                + nla_total_size(sizeof(struct rtnl_link_stats))
1012                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
1013                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
1014                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
1015                + nla_total_size(4) /* IFLA_TXQLEN */
1016                + nla_total_size(4) /* IFLA_WEIGHT */
1017                + nla_total_size(4) /* IFLA_MTU */
1018                + nla_total_size(4) /* IFLA_LINK */
1019                + nla_total_size(4) /* IFLA_MASTER */
1020                + nla_total_size(1) /* IFLA_CARRIER */
1021                + nla_total_size(4) /* IFLA_PROMISCUITY */
1022                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1023                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1024                + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1025                + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1026                + nla_total_size(1) /* IFLA_OPERSTATE */
1027                + nla_total_size(1) /* IFLA_LINKMODE */
1028                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1029                + nla_total_size(4) /* IFLA_LINK_NETNSID */
1030                + nla_total_size(4) /* IFLA_GROUP */
1031                + nla_total_size(ext_filter_mask
1032                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1033                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1034                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1035                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1036                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1037                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1038                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1039                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1040                + rtnl_xdp_size() /* IFLA_XDP */
1041                + nla_total_size(4)  /* IFLA_EVENT */
1042                + nla_total_size(4)  /* IFLA_NEW_NETNSID */
1043                + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
1044                + nla_total_size(1)  /* IFLA_PROTO_DOWN */
1045                + nla_total_size(4)  /* IFLA_TARGET_NETNSID */
1046                + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
1047                + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
1048                + nla_total_size(4)  /* IFLA_MIN_MTU */
1049                + nla_total_size(4)  /* IFLA_MAX_MTU */
1050                + rtnl_prop_list_size(dev)
1051                + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
1052                + 0;
1053 }
1054
1055 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1056 {
1057         struct nlattr *vf_ports;
1058         struct nlattr *vf_port;
1059         int vf;
1060         int err;
1061
1062         vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
1063         if (!vf_ports)
1064                 return -EMSGSIZE;
1065
1066         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1067                 vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
1068                 if (!vf_port)
1069                         goto nla_put_failure;
1070                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1071                         goto nla_put_failure;
1072                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1073                 if (err == -EMSGSIZE)
1074                         goto nla_put_failure;
1075                 if (err) {
1076                         nla_nest_cancel(skb, vf_port);
1077                         continue;
1078                 }
1079                 nla_nest_end(skb, vf_port);
1080         }
1081
1082         nla_nest_end(skb, vf_ports);
1083
1084         return 0;
1085
1086 nla_put_failure:
1087         nla_nest_cancel(skb, vf_ports);
1088         return -EMSGSIZE;
1089 }
1090
1091 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1092 {
1093         struct nlattr *port_self;
1094         int err;
1095
1096         port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
1097         if (!port_self)
1098                 return -EMSGSIZE;
1099
1100         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1101         if (err) {
1102                 nla_nest_cancel(skb, port_self);
1103                 return (err == -EMSGSIZE) ? err : 0;
1104         }
1105
1106         nla_nest_end(skb, port_self);
1107
1108         return 0;
1109 }
1110
1111 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1112                           u32 ext_filter_mask)
1113 {
1114         int err;
1115
1116         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1117             !(ext_filter_mask & RTEXT_FILTER_VF))
1118                 return 0;
1119
1120         err = rtnl_port_self_fill(skb, dev);
1121         if (err)
1122                 return err;
1123
1124         if (dev_num_vf(dev->dev.parent)) {
1125                 err = rtnl_vf_ports_fill(skb, dev);
1126                 if (err)
1127                         return err;
1128         }
1129
1130         return 0;
1131 }
1132
1133 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1134 {
1135         int err;
1136         struct netdev_phys_item_id ppid;
1137
1138         err = dev_get_phys_port_id(dev, &ppid);
1139         if (err) {
1140                 if (err == -EOPNOTSUPP)
1141                         return 0;
1142                 return err;
1143         }
1144
1145         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1146                 return -EMSGSIZE;
1147
1148         return 0;
1149 }
1150
1151 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1152 {
1153         char name[IFNAMSIZ];
1154         int err;
1155
1156         err = dev_get_phys_port_name(dev, name, sizeof(name));
1157         if (err) {
1158                 if (err == -EOPNOTSUPP)
1159                         return 0;
1160                 return err;
1161         }
1162
1163         if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1164                 return -EMSGSIZE;
1165
1166         return 0;
1167 }
1168
1169 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1170 {
1171         struct netdev_phys_item_id ppid = { };
1172         int err;
1173
1174         err = dev_get_port_parent_id(dev, &ppid, false);
1175         if (err) {
1176                 if (err == -EOPNOTSUPP)
1177                         return 0;
1178                 return err;
1179         }
1180
1181         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
1182                 return -EMSGSIZE;
1183
1184         return 0;
1185 }
1186
1187 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1188                                               struct net_device *dev)
1189 {
1190         struct rtnl_link_stats64 *sp;
1191         struct nlattr *attr;
1192
1193         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1194                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1195         if (!attr)
1196                 return -EMSGSIZE;
1197
1198         sp = nla_data(attr);
1199         dev_get_stats(dev, sp);
1200
1201         attr = nla_reserve(skb, IFLA_STATS,
1202                            sizeof(struct rtnl_link_stats));
1203         if (!attr)
1204                 return -EMSGSIZE;
1205
1206         copy_rtnl_link_stats(nla_data(attr), sp);
1207
1208         return 0;
1209 }
1210
1211 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1212                                                struct net_device *dev,
1213                                                int vfs_num,
1214                                                struct nlattr *vfinfo)
1215 {
1216         struct ifla_vf_rss_query_en vf_rss_query_en;
1217         struct nlattr *vf, *vfstats, *vfvlanlist;
1218         struct ifla_vf_link_state vf_linkstate;
1219         struct ifla_vf_vlan_info vf_vlan_info;
1220         struct ifla_vf_spoofchk vf_spoofchk;
1221         struct ifla_vf_tx_rate vf_tx_rate;
1222         struct ifla_vf_stats vf_stats;
1223         struct ifla_vf_trust vf_trust;
1224         struct ifla_vf_vlan vf_vlan;
1225         struct ifla_vf_rate vf_rate;
1226         struct ifla_vf_mac vf_mac;
1227         struct ifla_vf_broadcast vf_broadcast;
1228         struct ifla_vf_info ivi;
1229         struct ifla_vf_guid node_guid;
1230         struct ifla_vf_guid port_guid;
1231
1232         memset(&ivi, 0, sizeof(ivi));
1233
1234         /* Not all SR-IOV capable drivers support the
1235          * spoofcheck and "RSS query enable" query.  Preset to
1236          * -1 so the user space tool can detect that the driver
1237          * didn't report anything.
1238          */
1239         ivi.spoofchk = -1;
1240         ivi.rss_query_en = -1;
1241         ivi.trusted = -1;
1242         /* The default value for VF link state is "auto"
1243          * IFLA_VF_LINK_STATE_AUTO which equals zero
1244          */
1245         ivi.linkstate = 0;
1246         /* VLAN Protocol by default is 802.1Q */
1247         ivi.vlan_proto = htons(ETH_P_8021Q);
1248         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1249                 return 0;
1250
1251         memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1252         memset(&node_guid, 0, sizeof(node_guid));
1253         memset(&port_guid, 0, sizeof(port_guid));
1254
1255         vf_mac.vf =
1256                 vf_vlan.vf =
1257                 vf_vlan_info.vf =
1258                 vf_rate.vf =
1259                 vf_tx_rate.vf =
1260                 vf_spoofchk.vf =
1261                 vf_linkstate.vf =
1262                 vf_rss_query_en.vf =
1263                 vf_trust.vf =
1264                 node_guid.vf =
1265                 port_guid.vf = ivi.vf;
1266
1267         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1268         memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
1269         vf_vlan.vlan = ivi.vlan;
1270         vf_vlan.qos = ivi.qos;
1271         vf_vlan_info.vlan = ivi.vlan;
1272         vf_vlan_info.qos = ivi.qos;
1273         vf_vlan_info.vlan_proto = ivi.vlan_proto;
1274         vf_tx_rate.rate = ivi.max_tx_rate;
1275         vf_rate.min_tx_rate = ivi.min_tx_rate;
1276         vf_rate.max_tx_rate = ivi.max_tx_rate;
1277         vf_spoofchk.setting = ivi.spoofchk;
1278         vf_linkstate.link_state = ivi.linkstate;
1279         vf_rss_query_en.setting = ivi.rss_query_en;
1280         vf_trust.setting = ivi.trusted;
1281         vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1282         if (!vf)
1283                 goto nla_put_vfinfo_failure;
1284         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1285             nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
1286             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1287             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1288                     &vf_rate) ||
1289             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1290                     &vf_tx_rate) ||
1291             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1292                     &vf_spoofchk) ||
1293             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1294                     &vf_linkstate) ||
1295             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1296                     sizeof(vf_rss_query_en),
1297                     &vf_rss_query_en) ||
1298             nla_put(skb, IFLA_VF_TRUST,
1299                     sizeof(vf_trust), &vf_trust))
1300                 goto nla_put_vf_failure;
1301
1302         if (dev->netdev_ops->ndo_get_vf_guid &&
1303             !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
1304                                               &port_guid)) {
1305                 if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
1306                             &node_guid) ||
1307                     nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
1308                             &port_guid))
1309                         goto nla_put_vf_failure;
1310         }
1311         vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1312         if (!vfvlanlist)
1313                 goto nla_put_vf_failure;
1314         if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1315                     &vf_vlan_info)) {
1316                 nla_nest_cancel(skb, vfvlanlist);
1317                 goto nla_put_vf_failure;
1318         }
1319         nla_nest_end(skb, vfvlanlist);
1320         memset(&vf_stats, 0, sizeof(vf_stats));
1321         if (dev->netdev_ops->ndo_get_vf_stats)
1322                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1323                                                 &vf_stats);
1324         vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1325         if (!vfstats)
1326                 goto nla_put_vf_failure;
1327         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1328                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1329             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1330                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1331             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1332                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1333             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1334                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1335             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1336                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1337             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1338                               vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1339             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1340                               vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1341             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1342                               vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1343                 nla_nest_cancel(skb, vfstats);
1344                 goto nla_put_vf_failure;
1345         }
1346         nla_nest_end(skb, vfstats);
1347         nla_nest_end(skb, vf);
1348         return 0;
1349
1350 nla_put_vf_failure:
1351         nla_nest_cancel(skb, vf);
1352 nla_put_vfinfo_failure:
1353         nla_nest_cancel(skb, vfinfo);
1354         return -EMSGSIZE;
1355 }
1356
1357 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1358                                            struct net_device *dev,
1359                                            u32 ext_filter_mask)
1360 {
1361         struct nlattr *vfinfo;
1362         int i, num_vfs;
1363
1364         if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1365                 return 0;
1366
1367         num_vfs = dev_num_vf(dev->dev.parent);
1368         if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1369                 return -EMSGSIZE;
1370
1371         if (!dev->netdev_ops->ndo_get_vf_config)
1372                 return 0;
1373
1374         vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1375         if (!vfinfo)
1376                 return -EMSGSIZE;
1377
1378         for (i = 0; i < num_vfs; i++) {
1379                 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1380                         return -EMSGSIZE;
1381         }
1382
1383         nla_nest_end(skb, vfinfo);
1384         return 0;
1385 }
1386
1387 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1388 {
1389         struct rtnl_link_ifmap map;
1390
1391         memset(&map, 0, sizeof(map));
1392         map.mem_start   = dev->mem_start;
1393         map.mem_end     = dev->mem_end;
1394         map.base_addr   = dev->base_addr;
1395         map.irq         = dev->irq;
1396         map.dma         = dev->dma;
1397         map.port        = dev->if_port;
1398
1399         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1400                 return -EMSGSIZE;
1401
1402         return 0;
1403 }
1404
1405 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1406 {
1407         const struct bpf_prog *generic_xdp_prog;
1408
1409         ASSERT_RTNL();
1410
1411         generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1412         if (!generic_xdp_prog)
1413                 return 0;
1414         return generic_xdp_prog->aux->id;
1415 }
1416
1417 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1418 {
1419         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf, XDP_QUERY_PROG);
1420 }
1421
1422 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1423 {
1424         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf,
1425                                XDP_QUERY_PROG_HW);
1426 }
1427
1428 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1429                                u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1430                                u32 (*get_prog_id)(struct net_device *dev))
1431 {
1432         u32 curr_id;
1433         int err;
1434
1435         curr_id = get_prog_id(dev);
1436         if (!curr_id)
1437                 return 0;
1438
1439         *prog_id = curr_id;
1440         err = nla_put_u32(skb, attr, curr_id);
1441         if (err)
1442                 return err;
1443
1444         if (*mode != XDP_ATTACHED_NONE)
1445                 *mode = XDP_ATTACHED_MULTI;
1446         else
1447                 *mode = tgt_mode;
1448
1449         return 0;
1450 }
1451
1452 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1453 {
1454         struct nlattr *xdp;
1455         u32 prog_id;
1456         int err;
1457         u8 mode;
1458
1459         xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1460         if (!xdp)
1461                 return -EMSGSIZE;
1462
1463         prog_id = 0;
1464         mode = XDP_ATTACHED_NONE;
1465         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1466                                   IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1467         if (err)
1468                 goto err_cancel;
1469         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1470                                   IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1471         if (err)
1472                 goto err_cancel;
1473         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1474                                   IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1475         if (err)
1476                 goto err_cancel;
1477
1478         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1479         if (err)
1480                 goto err_cancel;
1481
1482         if (prog_id && mode != XDP_ATTACHED_MULTI) {
1483                 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1484                 if (err)
1485                         goto err_cancel;
1486         }
1487
1488         nla_nest_end(skb, xdp);
1489         return 0;
1490
1491 err_cancel:
1492         nla_nest_cancel(skb, xdp);
1493         return err;
1494 }
1495
1496 static u32 rtnl_get_event(unsigned long event)
1497 {
1498         u32 rtnl_event_type = IFLA_EVENT_NONE;
1499
1500         switch (event) {
1501         case NETDEV_REBOOT:
1502                 rtnl_event_type = IFLA_EVENT_REBOOT;
1503                 break;
1504         case NETDEV_FEAT_CHANGE:
1505                 rtnl_event_type = IFLA_EVENT_FEATURES;
1506                 break;
1507         case NETDEV_BONDING_FAILOVER:
1508                 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1509                 break;
1510         case NETDEV_NOTIFY_PEERS:
1511                 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1512                 break;
1513         case NETDEV_RESEND_IGMP:
1514                 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1515                 break;
1516         case NETDEV_CHANGEINFODATA:
1517                 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1518                 break;
1519         default:
1520                 break;
1521         }
1522
1523         return rtnl_event_type;
1524 }
1525
1526 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1527 {
1528         const struct net_device *upper_dev;
1529         int ret = 0;
1530
1531         rcu_read_lock();
1532
1533         upper_dev = netdev_master_upper_dev_get_rcu(dev);
1534         if (upper_dev)
1535                 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1536
1537         rcu_read_unlock();
1538         return ret;
1539 }
1540
1541 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1542                           bool force)
1543 {
1544         int ifindex = dev_get_iflink(dev);
1545
1546         if (force || dev->ifindex != ifindex)
1547                 return nla_put_u32(skb, IFLA_LINK, ifindex);
1548
1549         return 0;
1550 }
1551
1552 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1553                                               struct net_device *dev)
1554 {
1555         char buf[IFALIASZ];
1556         int ret;
1557
1558         ret = dev_get_alias(dev, buf, sizeof(buf));
1559         return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1560 }
1561
1562 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1563                                   const struct net_device *dev,
1564                                   struct net *src_net, gfp_t gfp)
1565 {
1566         bool put_iflink = false;
1567
1568         if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1569                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1570
1571                 if (!net_eq(dev_net(dev), link_net)) {
1572                         int id = peernet2id_alloc(src_net, link_net, gfp);
1573
1574                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1575                                 return -EMSGSIZE;
1576
1577                         put_iflink = true;
1578                 }
1579         }
1580
1581         return nla_put_iflink(skb, dev, put_iflink);
1582 }
1583
1584 static int rtnl_fill_link_af(struct sk_buff *skb,
1585                              const struct net_device *dev,
1586                              u32 ext_filter_mask)
1587 {
1588         const struct rtnl_af_ops *af_ops;
1589         struct nlattr *af_spec;
1590
1591         af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1592         if (!af_spec)
1593                 return -EMSGSIZE;
1594
1595         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1596                 struct nlattr *af;
1597                 int err;
1598
1599                 if (!af_ops->fill_link_af)
1600                         continue;
1601
1602                 af = nla_nest_start_noflag(skb, af_ops->family);
1603                 if (!af)
1604                         return -EMSGSIZE;
1605
1606                 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1607                 /*
1608                  * Caller may return ENODATA to indicate that there
1609                  * was no data to be dumped. This is not an error, it
1610                  * means we should trim the attribute header and
1611                  * continue.
1612                  */
1613                 if (err == -ENODATA)
1614                         nla_nest_cancel(skb, af);
1615                 else if (err < 0)
1616                         return -EMSGSIZE;
1617
1618                 nla_nest_end(skb, af);
1619         }
1620
1621         nla_nest_end(skb, af_spec);
1622         return 0;
1623 }
1624
1625 static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
1626                                  const struct net_device *dev)
1627 {
1628         struct netdev_name_node *name_node;
1629         int count = 0;
1630
1631         list_for_each_entry(name_node, &dev->name_node->list, list) {
1632                 if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
1633                         return -EMSGSIZE;
1634                 count++;
1635         }
1636         return count;
1637 }
1638
1639 static int rtnl_fill_prop_list(struct sk_buff *skb,
1640                                const struct net_device *dev)
1641 {
1642         struct nlattr *prop_list;
1643         int ret;
1644
1645         prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
1646         if (!prop_list)
1647                 return -EMSGSIZE;
1648
1649         ret = rtnl_fill_alt_ifnames(skb, dev);
1650         if (ret <= 0)
1651                 goto nest_cancel;
1652
1653         nla_nest_end(skb, prop_list);
1654         return 0;
1655
1656 nest_cancel:
1657         nla_nest_cancel(skb, prop_list);
1658         return ret;
1659 }
1660
1661 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1662                             struct net_device *dev, struct net *src_net,
1663                             int type, u32 pid, u32 seq, u32 change,
1664                             unsigned int flags, u32 ext_filter_mask,
1665                             u32 event, int *new_nsid, int new_ifindex,
1666                             int tgt_netnsid, gfp_t gfp)
1667 {
1668         struct ifinfomsg *ifm;
1669         struct nlmsghdr *nlh;
1670
1671         ASSERT_RTNL();
1672         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1673         if (nlh == NULL)
1674                 return -EMSGSIZE;
1675
1676         ifm = nlmsg_data(nlh);
1677         ifm->ifi_family = AF_UNSPEC;
1678         ifm->__ifi_pad = 0;
1679         ifm->ifi_type = dev->type;
1680         ifm->ifi_index = dev->ifindex;
1681         ifm->ifi_flags = dev_get_flags(dev);
1682         ifm->ifi_change = change;
1683
1684         if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1685                 goto nla_put_failure;
1686
1687         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1688             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1689             nla_put_u8(skb, IFLA_OPERSTATE,
1690                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1691             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1692             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1693             nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1694             nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1695             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1696             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1697             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1698             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1699             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1700 #ifdef CONFIG_RPS
1701             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1702 #endif
1703             put_master_ifindex(skb, dev) ||
1704             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1705             (dev->qdisc &&
1706              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1707             nla_put_ifalias(skb, dev) ||
1708             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1709                         atomic_read(&dev->carrier_up_count) +
1710                         atomic_read(&dev->carrier_down_count)) ||
1711             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down) ||
1712             nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1713                         atomic_read(&dev->carrier_up_count)) ||
1714             nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1715                         atomic_read(&dev->carrier_down_count)))
1716                 goto nla_put_failure;
1717
1718         if (event != IFLA_EVENT_NONE) {
1719                 if (nla_put_u32(skb, IFLA_EVENT, event))
1720                         goto nla_put_failure;
1721         }
1722
1723         if (rtnl_fill_link_ifmap(skb, dev))
1724                 goto nla_put_failure;
1725
1726         if (dev->addr_len) {
1727                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1728                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1729                         goto nla_put_failure;
1730         }
1731
1732         if (rtnl_phys_port_id_fill(skb, dev))
1733                 goto nla_put_failure;
1734
1735         if (rtnl_phys_port_name_fill(skb, dev))
1736                 goto nla_put_failure;
1737
1738         if (rtnl_phys_switch_id_fill(skb, dev))
1739                 goto nla_put_failure;
1740
1741         if (rtnl_fill_stats(skb, dev))
1742                 goto nla_put_failure;
1743
1744         if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1745                 goto nla_put_failure;
1746
1747         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1748                 goto nla_put_failure;
1749
1750         if (rtnl_xdp_fill(skb, dev))
1751                 goto nla_put_failure;
1752
1753         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1754                 if (rtnl_link_fill(skb, dev) < 0)
1755                         goto nla_put_failure;
1756         }
1757
1758         if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1759                 goto nla_put_failure;
1760
1761         if (new_nsid &&
1762             nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1763                 goto nla_put_failure;
1764         if (new_ifindex &&
1765             nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1766                 goto nla_put_failure;
1767
1768         if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
1769             nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
1770                 goto nla_put_failure;
1771
1772         rcu_read_lock();
1773         if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1774                 goto nla_put_failure_rcu;
1775         rcu_read_unlock();
1776
1777         if (rtnl_fill_prop_list(skb, dev))
1778                 goto nla_put_failure;
1779
1780         nlmsg_end(skb, nlh);
1781         return 0;
1782
1783 nla_put_failure_rcu:
1784         rcu_read_unlock();
1785 nla_put_failure:
1786         nlmsg_cancel(skb, nlh);
1787         return -EMSGSIZE;
1788 }
1789
1790 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1791         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1792         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1793         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1794         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1795         [IFLA_MTU]              = { .type = NLA_U32 },
1796         [IFLA_LINK]             = { .type = NLA_U32 },
1797         [IFLA_MASTER]           = { .type = NLA_U32 },
1798         [IFLA_CARRIER]          = { .type = NLA_U8 },
1799         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1800         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1801         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1802         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1803         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1804         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1805         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1806         /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1807          * allow 0-length string (needed to remove an alias).
1808          */
1809         [IFLA_IFALIAS]          = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1810         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1811         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1812         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1813         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1814         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1815         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1816         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1817         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1818         [IFLA_GSO_MAX_SEGS]     = { .type = NLA_U32 },
1819         [IFLA_GSO_MAX_SIZE]     = { .type = NLA_U32 },
1820         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1821         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1822         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1823         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1824         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1825         [IFLA_XDP]              = { .type = NLA_NESTED },
1826         [IFLA_EVENT]            = { .type = NLA_U32 },
1827         [IFLA_GROUP]            = { .type = NLA_U32 },
1828         [IFLA_TARGET_NETNSID]   = { .type = NLA_S32 },
1829         [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1830         [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1831         [IFLA_MIN_MTU]          = { .type = NLA_U32 },
1832         [IFLA_MAX_MTU]          = { .type = NLA_U32 },
1833         [IFLA_PROP_LIST]        = { .type = NLA_NESTED },
1834         [IFLA_ALT_IFNAME]       = { .type = NLA_STRING,
1835                                     .len = ALTIFNAMSIZ - 1 },
1836         [IFLA_PERM_ADDRESS]     = { .type = NLA_REJECT },
1837 };
1838
1839 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1840         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1841         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1842         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1843         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1844 };
1845
1846 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1847         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1848         [IFLA_VF_BROADCAST]     = { .type = NLA_REJECT },
1849         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1850         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1851         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1852         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1853         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1854         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1855         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1856         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1857         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1858         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1859         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1860 };
1861
1862 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1863         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1864         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1865                                     .len = PORT_PROFILE_MAX },
1866         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1867                                       .len = PORT_UUID_MAX },
1868         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1869                                     .len = PORT_UUID_MAX },
1870         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1871         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1872
1873         /* Unused, but we need to keep it here since user space could
1874          * fill it. It's also broken with regard to NLA_BINARY use in
1875          * combination with structs.
1876          */
1877         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1878                                     .len = sizeof(struct ifla_port_vsi) },
1879 };
1880
1881 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1882         [IFLA_XDP_UNSPEC]       = { .strict_start_type = IFLA_XDP_EXPECTED_FD },
1883         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1884         [IFLA_XDP_EXPECTED_FD]  = { .type = NLA_S32 },
1885         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1886         [IFLA_XDP_FLAGS]        = { .type = NLA_U32 },
1887         [IFLA_XDP_PROG_ID]      = { .type = NLA_U32 },
1888 };
1889
1890 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1891 {
1892         const struct rtnl_link_ops *ops = NULL;
1893         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1894
1895         if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
1896                 return NULL;
1897
1898         if (linfo[IFLA_INFO_KIND]) {
1899                 char kind[MODULE_NAME_LEN];
1900
1901                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1902                 ops = rtnl_link_ops_get(kind);
1903         }
1904
1905         return ops;
1906 }
1907
1908 static bool link_master_filtered(struct net_device *dev, int master_idx)
1909 {
1910         struct net_device *master;
1911
1912         if (!master_idx)
1913                 return false;
1914
1915         master = netdev_master_upper_dev_get(dev);
1916         if (!master || master->ifindex != master_idx)
1917                 return true;
1918
1919         return false;
1920 }
1921
1922 static bool link_kind_filtered(const struct net_device *dev,
1923                                const struct rtnl_link_ops *kind_ops)
1924 {
1925         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1926                 return true;
1927
1928         return false;
1929 }
1930
1931 static bool link_dump_filtered(struct net_device *dev,
1932                                int master_idx,
1933                                const struct rtnl_link_ops *kind_ops)
1934 {
1935         if (link_master_filtered(dev, master_idx) ||
1936             link_kind_filtered(dev, kind_ops))
1937                 return true;
1938
1939         return false;
1940 }
1941
1942 /**
1943  * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
1944  * @sk: netlink socket
1945  * @netnsid: network namespace identifier
1946  *
1947  * Returns the network namespace identified by netnsid on success or an error
1948  * pointer on failure.
1949  */
1950 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
1951 {
1952         struct net *net;
1953
1954         net = get_net_ns_by_id(sock_net(sk), netnsid);
1955         if (!net)
1956                 return ERR_PTR(-EINVAL);
1957
1958         /* For now, the caller is required to have CAP_NET_ADMIN in
1959          * the user namespace owning the target net ns.
1960          */
1961         if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
1962                 put_net(net);
1963                 return ERR_PTR(-EACCES);
1964         }
1965         return net;
1966 }
1967 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
1968
1969 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
1970                                       bool strict_check, struct nlattr **tb,
1971                                       struct netlink_ext_ack *extack)
1972 {
1973         int hdrlen;
1974
1975         if (strict_check) {
1976                 struct ifinfomsg *ifm;
1977
1978                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1979                         NL_SET_ERR_MSG(extack, "Invalid header for link dump");
1980                         return -EINVAL;
1981                 }
1982
1983                 ifm = nlmsg_data(nlh);
1984                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
1985                     ifm->ifi_change) {
1986                         NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
1987                         return -EINVAL;
1988                 }
1989                 if (ifm->ifi_index) {
1990                         NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
1991                         return -EINVAL;
1992                 }
1993
1994                 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
1995                                                      IFLA_MAX, ifla_policy,
1996                                                      extack);
1997         }
1998
1999         /* A hack to preserve kernel<->userspace interface.
2000          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
2001          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
2002          * what iproute2 < v3.9.0 used.
2003          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
2004          * attribute, its netlink message is shorter than struct ifinfomsg.
2005          */
2006         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2007                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2008
2009         return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
2010                                       extack);
2011 }
2012
2013 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2014 {
2015         struct netlink_ext_ack *extack = cb->extack;
2016         const struct nlmsghdr *nlh = cb->nlh;
2017         struct net *net = sock_net(skb->sk);
2018         struct net *tgt_net = net;
2019         int h, s_h;
2020         int idx = 0, s_idx;
2021         struct net_device *dev;
2022         struct hlist_head *head;
2023         struct nlattr *tb[IFLA_MAX+1];
2024         u32 ext_filter_mask = 0;
2025         const struct rtnl_link_ops *kind_ops = NULL;
2026         unsigned int flags = NLM_F_MULTI;
2027         int master_idx = 0;
2028         int netnsid = -1;
2029         int err, i;
2030
2031         s_h = cb->args[0];
2032         s_idx = cb->args[1];
2033
2034         err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
2035         if (err < 0) {
2036                 if (cb->strict_check)
2037                         return err;
2038
2039                 goto walk_entries;
2040         }
2041
2042         for (i = 0; i <= IFLA_MAX; ++i) {
2043                 if (!tb[i])
2044                         continue;
2045
2046                 /* new attributes should only be added with strict checking */
2047                 switch (i) {
2048                 case IFLA_TARGET_NETNSID:
2049                         netnsid = nla_get_s32(tb[i]);
2050                         tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
2051                         if (IS_ERR(tgt_net)) {
2052                                 NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
2053                                 return PTR_ERR(tgt_net);
2054                         }
2055                         break;
2056                 case IFLA_EXT_MASK:
2057                         ext_filter_mask = nla_get_u32(tb[i]);
2058                         break;
2059                 case IFLA_MASTER:
2060                         master_idx = nla_get_u32(tb[i]);
2061                         break;
2062                 case IFLA_LINKINFO:
2063                         kind_ops = linkinfo_to_kind_ops(tb[i]);
2064                         break;
2065                 default:
2066                         if (cb->strict_check) {
2067                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
2068                                 return -EINVAL;
2069                         }
2070                 }
2071         }
2072
2073         if (master_idx || kind_ops)
2074                 flags |= NLM_F_DUMP_FILTERED;
2075
2076 walk_entries:
2077         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2078                 idx = 0;
2079                 head = &tgt_net->dev_index_head[h];
2080                 hlist_for_each_entry(dev, head, index_hlist) {
2081                         if (link_dump_filtered(dev, master_idx, kind_ops))
2082                                 goto cont;
2083                         if (idx < s_idx)
2084                                 goto cont;
2085                         err = rtnl_fill_ifinfo(skb, dev, net,
2086                                                RTM_NEWLINK,
2087                                                NETLINK_CB(cb->skb).portid,
2088                                                nlh->nlmsg_seq, 0, flags,
2089                                                ext_filter_mask, 0, NULL, 0,
2090                                                netnsid, GFP_KERNEL);
2091
2092                         if (err < 0) {
2093                                 if (likely(skb->len))
2094                                         goto out;
2095
2096                                 goto out_err;
2097                         }
2098 cont:
2099                         idx++;
2100                 }
2101         }
2102 out:
2103         err = skb->len;
2104 out_err:
2105         cb->args[1] = idx;
2106         cb->args[0] = h;
2107         cb->seq = net->dev_base_seq;
2108         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2109         if (netnsid >= 0)
2110                 put_net(tgt_net);
2111
2112         return err;
2113 }
2114
2115 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2116                         struct netlink_ext_ack *exterr)
2117 {
2118         return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
2119                                     exterr);
2120 }
2121 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
2122
2123 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2124 {
2125         struct net *net;
2126         /* Examine the link attributes and figure out which
2127          * network namespace we are talking about.
2128          */
2129         if (tb[IFLA_NET_NS_PID])
2130                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2131         else if (tb[IFLA_NET_NS_FD])
2132                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2133         else
2134                 net = get_net(src_net);
2135         return net;
2136 }
2137 EXPORT_SYMBOL(rtnl_link_get_net);
2138
2139 /* Figure out which network namespace we are talking about by
2140  * examining the link attributes in the following order:
2141  *
2142  * 1. IFLA_NET_NS_PID
2143  * 2. IFLA_NET_NS_FD
2144  * 3. IFLA_TARGET_NETNSID
2145  */
2146 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2147                                                struct nlattr *tb[])
2148 {
2149         struct net *net;
2150
2151         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2152                 return rtnl_link_get_net(src_net, tb);
2153
2154         if (!tb[IFLA_TARGET_NETNSID])
2155                 return get_net(src_net);
2156
2157         net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2158         if (!net)
2159                 return ERR_PTR(-EINVAL);
2160
2161         return net;
2162 }
2163
2164 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2165                                              struct net *src_net,
2166                                              struct nlattr *tb[], int cap)
2167 {
2168         struct net *net;
2169
2170         net = rtnl_link_get_net_by_nlattr(src_net, tb);
2171         if (IS_ERR(net))
2172                 return net;
2173
2174         if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2175                 put_net(net);
2176                 return ERR_PTR(-EPERM);
2177         }
2178
2179         return net;
2180 }
2181
2182 /* Verify that rtnetlink requests do not pass additional properties
2183  * potentially referring to different network namespaces.
2184  */
2185 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2186                                     struct netlink_ext_ack *extack,
2187                                     bool netns_id_only)
2188 {
2189
2190         if (netns_id_only) {
2191                 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2192                         return 0;
2193
2194                 NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2195                 return -EOPNOTSUPP;
2196         }
2197
2198         if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2199                 goto invalid_attr;
2200
2201         if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2202                 goto invalid_attr;
2203
2204         if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2205                 goto invalid_attr;
2206
2207         return 0;
2208
2209 invalid_attr:
2210         NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2211         return -EINVAL;
2212 }
2213
2214 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
2215 {
2216         if (dev) {
2217                 if (tb[IFLA_ADDRESS] &&
2218                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2219                         return -EINVAL;
2220
2221                 if (tb[IFLA_BROADCAST] &&
2222                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2223                         return -EINVAL;
2224         }
2225
2226         if (tb[IFLA_AF_SPEC]) {
2227                 struct nlattr *af;
2228                 int rem, err;
2229
2230                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2231                         const struct rtnl_af_ops *af_ops;
2232
2233                         rcu_read_lock();
2234                         af_ops = rtnl_af_lookup(nla_type(af));
2235                         if (!af_ops) {
2236                                 rcu_read_unlock();
2237                                 return -EAFNOSUPPORT;
2238                         }
2239
2240                         if (!af_ops->set_link_af) {
2241                                 rcu_read_unlock();
2242                                 return -EOPNOTSUPP;
2243                         }
2244
2245                         if (af_ops->validate_link_af) {
2246                                 err = af_ops->validate_link_af(dev, af);
2247                                 if (err < 0) {
2248                                         rcu_read_unlock();
2249                                         return err;
2250                                 }
2251                         }
2252
2253                         rcu_read_unlock();
2254                 }
2255         }
2256
2257         return 0;
2258 }
2259
2260 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2261                                   int guid_type)
2262 {
2263         const struct net_device_ops *ops = dev->netdev_ops;
2264
2265         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2266 }
2267
2268 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2269 {
2270         if (dev->type != ARPHRD_INFINIBAND)
2271                 return -EOPNOTSUPP;
2272
2273         return handle_infiniband_guid(dev, ivt, guid_type);
2274 }
2275
2276 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2277 {
2278         const struct net_device_ops *ops = dev->netdev_ops;
2279         int err = -EINVAL;
2280
2281         if (tb[IFLA_VF_MAC]) {
2282                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2283
2284                 if (ivm->vf >= INT_MAX)
2285                         return -EINVAL;
2286                 err = -EOPNOTSUPP;
2287                 if (ops->ndo_set_vf_mac)
2288                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
2289                                                   ivm->mac);
2290                 if (err < 0)
2291                         return err;
2292         }
2293
2294         if (tb[IFLA_VF_VLAN]) {
2295                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2296
2297                 if (ivv->vf >= INT_MAX)
2298                         return -EINVAL;
2299                 err = -EOPNOTSUPP;
2300                 if (ops->ndo_set_vf_vlan)
2301                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2302                                                    ivv->qos,
2303                                                    htons(ETH_P_8021Q));
2304                 if (err < 0)
2305                         return err;
2306         }
2307
2308         if (tb[IFLA_VF_VLAN_LIST]) {
2309                 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2310                 struct nlattr *attr;
2311                 int rem, len = 0;
2312
2313                 err = -EOPNOTSUPP;
2314                 if (!ops->ndo_set_vf_vlan)
2315                         return err;
2316
2317                 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2318                         if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2319                             nla_len(attr) < NLA_HDRLEN) {
2320                                 return -EINVAL;
2321                         }
2322                         if (len >= MAX_VLAN_LIST_LEN)
2323                                 return -EOPNOTSUPP;
2324                         ivvl[len] = nla_data(attr);
2325
2326                         len++;
2327                 }
2328                 if (len == 0)
2329                         return -EINVAL;
2330
2331                 if (ivvl[0]->vf >= INT_MAX)
2332                         return -EINVAL;
2333                 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2334                                            ivvl[0]->qos, ivvl[0]->vlan_proto);
2335                 if (err < 0)
2336                         return err;
2337         }
2338
2339         if (tb[IFLA_VF_TX_RATE]) {
2340                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2341                 struct ifla_vf_info ivf;
2342
2343                 if (ivt->vf >= INT_MAX)
2344                         return -EINVAL;
2345                 err = -EOPNOTSUPP;
2346                 if (ops->ndo_get_vf_config)
2347                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2348                 if (err < 0)
2349                         return err;
2350
2351                 err = -EOPNOTSUPP;
2352                 if (ops->ndo_set_vf_rate)
2353                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2354                                                    ivf.min_tx_rate,
2355                                                    ivt->rate);
2356                 if (err < 0)
2357                         return err;
2358         }
2359
2360         if (tb[IFLA_VF_RATE]) {
2361                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2362
2363                 if (ivt->vf >= INT_MAX)
2364                         return -EINVAL;
2365                 err = -EOPNOTSUPP;
2366                 if (ops->ndo_set_vf_rate)
2367                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2368                                                    ivt->min_tx_rate,
2369                                                    ivt->max_tx_rate);
2370                 if (err < 0)
2371                         return err;
2372         }
2373
2374         if (tb[IFLA_VF_SPOOFCHK]) {
2375                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2376
2377                 if (ivs->vf >= INT_MAX)
2378                         return -EINVAL;
2379                 err = -EOPNOTSUPP;
2380                 if (ops->ndo_set_vf_spoofchk)
2381                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2382                                                        ivs->setting);
2383                 if (err < 0)
2384                         return err;
2385         }
2386
2387         if (tb[IFLA_VF_LINK_STATE]) {
2388                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2389
2390                 if (ivl->vf >= INT_MAX)
2391                         return -EINVAL;
2392                 err = -EOPNOTSUPP;
2393                 if (ops->ndo_set_vf_link_state)
2394                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2395                                                          ivl->link_state);
2396                 if (err < 0)
2397                         return err;
2398         }
2399
2400         if (tb[IFLA_VF_RSS_QUERY_EN]) {
2401                 struct ifla_vf_rss_query_en *ivrssq_en;
2402
2403                 err = -EOPNOTSUPP;
2404                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2405                 if (ivrssq_en->vf >= INT_MAX)
2406                         return -EINVAL;
2407                 if (ops->ndo_set_vf_rss_query_en)
2408                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2409                                                            ivrssq_en->setting);
2410                 if (err < 0)
2411                         return err;
2412         }
2413
2414         if (tb[IFLA_VF_TRUST]) {
2415                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2416
2417                 if (ivt->vf >= INT_MAX)
2418                         return -EINVAL;
2419                 err = -EOPNOTSUPP;
2420                 if (ops->ndo_set_vf_trust)
2421                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2422                 if (err < 0)
2423                         return err;
2424         }
2425
2426         if (tb[IFLA_VF_IB_NODE_GUID]) {
2427                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2428
2429                 if (ivt->vf >= INT_MAX)
2430                         return -EINVAL;
2431                 if (!ops->ndo_set_vf_guid)
2432                         return -EOPNOTSUPP;
2433                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2434         }
2435
2436         if (tb[IFLA_VF_IB_PORT_GUID]) {
2437                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2438
2439                 if (ivt->vf >= INT_MAX)
2440                         return -EINVAL;
2441                 if (!ops->ndo_set_vf_guid)
2442                         return -EOPNOTSUPP;
2443
2444                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2445         }
2446
2447         return err;
2448 }
2449
2450 static int do_set_master(struct net_device *dev, int ifindex,
2451                          struct netlink_ext_ack *extack)
2452 {
2453         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2454         const struct net_device_ops *ops;
2455         int err;
2456
2457         if (upper_dev) {
2458                 if (upper_dev->ifindex == ifindex)
2459                         return 0;
2460                 ops = upper_dev->netdev_ops;
2461                 if (ops->ndo_del_slave) {
2462                         err = ops->ndo_del_slave(upper_dev, dev);
2463                         if (err)
2464                                 return err;
2465                 } else {
2466                         return -EOPNOTSUPP;
2467                 }
2468         }
2469
2470         if (ifindex) {
2471                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2472                 if (!upper_dev)
2473                         return -EINVAL;
2474                 ops = upper_dev->netdev_ops;
2475                 if (ops->ndo_add_slave) {
2476                         err = ops->ndo_add_slave(upper_dev, dev, extack);
2477                         if (err)
2478                                 return err;
2479                 } else {
2480                         return -EOPNOTSUPP;
2481                 }
2482         }
2483         return 0;
2484 }
2485
2486 #define DO_SETLINK_MODIFIED     0x01
2487 /* notify flag means notify + modified. */
2488 #define DO_SETLINK_NOTIFY       0x03
2489 static int do_setlink(const struct sk_buff *skb,
2490                       struct net_device *dev, struct ifinfomsg *ifm,
2491                       struct netlink_ext_ack *extack,
2492                       struct nlattr **tb, char *ifname, int status)
2493 {
2494         const struct net_device_ops *ops = dev->netdev_ops;
2495         int err;
2496
2497         err = validate_linkmsg(dev, tb);
2498         if (err < 0)
2499                 return err;
2500
2501         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2502                 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev),
2503                                                             tb, CAP_NET_ADMIN);
2504                 if (IS_ERR(net)) {
2505                         err = PTR_ERR(net);
2506                         goto errout;
2507                 }
2508
2509                 err = dev_change_net_namespace(dev, net, ifname);
2510                 put_net(net);
2511                 if (err)
2512                         goto errout;
2513                 status |= DO_SETLINK_MODIFIED;
2514         }
2515
2516         if (tb[IFLA_MAP]) {
2517                 struct rtnl_link_ifmap *u_map;
2518                 struct ifmap k_map;
2519
2520                 if (!ops->ndo_set_config) {
2521                         err = -EOPNOTSUPP;
2522                         goto errout;
2523                 }
2524
2525                 if (!netif_device_present(dev)) {
2526                         err = -ENODEV;
2527                         goto errout;
2528                 }
2529
2530                 u_map = nla_data(tb[IFLA_MAP]);
2531                 k_map.mem_start = (unsigned long) u_map->mem_start;
2532                 k_map.mem_end = (unsigned long) u_map->mem_end;
2533                 k_map.base_addr = (unsigned short) u_map->base_addr;
2534                 k_map.irq = (unsigned char) u_map->irq;
2535                 k_map.dma = (unsigned char) u_map->dma;
2536                 k_map.port = (unsigned char) u_map->port;
2537
2538                 err = ops->ndo_set_config(dev, &k_map);
2539                 if (err < 0)
2540                         goto errout;
2541
2542                 status |= DO_SETLINK_NOTIFY;
2543         }
2544
2545         if (tb[IFLA_ADDRESS]) {
2546                 struct sockaddr *sa;
2547                 int len;
2548
2549                 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2550                                                   sizeof(*sa));
2551                 sa = kmalloc(len, GFP_KERNEL);
2552                 if (!sa) {
2553                         err = -ENOMEM;
2554                         goto errout;
2555                 }
2556                 sa->sa_family = dev->type;
2557                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2558                        dev->addr_len);
2559                 err = dev_set_mac_address(dev, sa, extack);
2560                 kfree(sa);
2561                 if (err)
2562                         goto errout;
2563                 status |= DO_SETLINK_MODIFIED;
2564         }
2565
2566         if (tb[IFLA_MTU]) {
2567                 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2568                 if (err < 0)
2569                         goto errout;
2570                 status |= DO_SETLINK_MODIFIED;
2571         }
2572
2573         if (tb[IFLA_GROUP]) {
2574                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2575                 status |= DO_SETLINK_NOTIFY;
2576         }
2577
2578         /*
2579          * Interface selected by interface index but interface
2580          * name provided implies that a name change has been
2581          * requested.
2582          */
2583         if (ifm->ifi_index > 0 && ifname[0]) {
2584                 err = dev_change_name(dev, ifname);
2585                 if (err < 0)
2586                         goto errout;
2587                 status |= DO_SETLINK_MODIFIED;
2588         }
2589
2590         if (tb[IFLA_IFALIAS]) {
2591                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2592                                     nla_len(tb[IFLA_IFALIAS]));
2593                 if (err < 0)
2594                         goto errout;
2595                 status |= DO_SETLINK_NOTIFY;
2596         }
2597
2598         if (tb[IFLA_BROADCAST]) {
2599                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2600                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2601         }
2602
2603         if (ifm->ifi_flags || ifm->ifi_change) {
2604                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2605                                        extack);
2606                 if (err < 0)
2607                         goto errout;
2608         }
2609
2610         if (tb[IFLA_MASTER]) {
2611                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2612                 if (err)
2613                         goto errout;
2614                 status |= DO_SETLINK_MODIFIED;
2615         }
2616
2617         if (tb[IFLA_CARRIER]) {
2618                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2619                 if (err)
2620                         goto errout;
2621                 status |= DO_SETLINK_MODIFIED;
2622         }
2623
2624         if (tb[IFLA_TXQLEN]) {
2625                 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2626
2627                 err = dev_change_tx_queue_len(dev, value);
2628                 if (err)
2629                         goto errout;
2630                 status |= DO_SETLINK_MODIFIED;
2631         }
2632
2633         if (tb[IFLA_GSO_MAX_SIZE]) {
2634                 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2635
2636                 if (max_size > GSO_MAX_SIZE) {
2637                         err = -EINVAL;
2638                         goto errout;
2639                 }
2640
2641                 if (dev->gso_max_size ^ max_size) {
2642                         netif_set_gso_max_size(dev, max_size);
2643                         status |= DO_SETLINK_MODIFIED;
2644                 }
2645         }
2646
2647         if (tb[IFLA_GSO_MAX_SEGS]) {
2648                 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2649
2650                 if (max_segs > GSO_MAX_SEGS) {
2651                         err = -EINVAL;
2652                         goto errout;
2653                 }
2654
2655                 if (dev->gso_max_segs ^ max_segs) {
2656                         dev->gso_max_segs = max_segs;
2657                         status |= DO_SETLINK_MODIFIED;
2658                 }
2659         }
2660
2661         if (tb[IFLA_OPERSTATE])
2662                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2663
2664         if (tb[IFLA_LINKMODE]) {
2665                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2666
2667                 write_lock_bh(&dev_base_lock);
2668                 if (dev->link_mode ^ value)
2669                         status |= DO_SETLINK_NOTIFY;
2670                 dev->link_mode = value;
2671                 write_unlock_bh(&dev_base_lock);
2672         }
2673
2674         if (tb[IFLA_VFINFO_LIST]) {
2675                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2676                 struct nlattr *attr;
2677                 int rem;
2678
2679                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2680                         if (nla_type(attr) != IFLA_VF_INFO ||
2681                             nla_len(attr) < NLA_HDRLEN) {
2682                                 err = -EINVAL;
2683                                 goto errout;
2684                         }
2685                         err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
2686                                                           attr,
2687                                                           ifla_vf_policy,
2688                                                           NULL);
2689                         if (err < 0)
2690                                 goto errout;
2691                         err = do_setvfinfo(dev, vfinfo);
2692                         if (err < 0)
2693                                 goto errout;
2694                         status |= DO_SETLINK_NOTIFY;
2695                 }
2696         }
2697         err = 0;
2698
2699         if (tb[IFLA_VF_PORTS]) {
2700                 struct nlattr *port[IFLA_PORT_MAX+1];
2701                 struct nlattr *attr;
2702                 int vf;
2703                 int rem;
2704
2705                 err = -EOPNOTSUPP;
2706                 if (!ops->ndo_set_vf_port)
2707                         goto errout;
2708
2709                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2710                         if (nla_type(attr) != IFLA_VF_PORT ||
2711                             nla_len(attr) < NLA_HDRLEN) {
2712                                 err = -EINVAL;
2713                                 goto errout;
2714                         }
2715                         err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2716                                                           attr,
2717                                                           ifla_port_policy,
2718                                                           NULL);
2719                         if (err < 0)
2720                                 goto errout;
2721                         if (!port[IFLA_PORT_VF]) {
2722                                 err = -EOPNOTSUPP;
2723                                 goto errout;
2724                         }
2725                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2726                         err = ops->ndo_set_vf_port(dev, vf, port);
2727                         if (err < 0)
2728                                 goto errout;
2729                         status |= DO_SETLINK_NOTIFY;
2730                 }
2731         }
2732         err = 0;
2733
2734         if (tb[IFLA_PORT_SELF]) {
2735                 struct nlattr *port[IFLA_PORT_MAX+1];
2736
2737                 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2738                                                   tb[IFLA_PORT_SELF],
2739                                                   ifla_port_policy, NULL);
2740                 if (err < 0)
2741                         goto errout;
2742
2743                 err = -EOPNOTSUPP;
2744                 if (ops->ndo_set_vf_port)
2745                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2746                 if (err < 0)
2747                         goto errout;
2748                 status |= DO_SETLINK_NOTIFY;
2749         }
2750
2751         if (tb[IFLA_AF_SPEC]) {
2752                 struct nlattr *af;
2753                 int rem;
2754
2755                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2756                         const struct rtnl_af_ops *af_ops;
2757
2758                         rcu_read_lock();
2759
2760                         BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2761
2762                         err = af_ops->set_link_af(dev, af);
2763                         if (err < 0) {
2764                                 rcu_read_unlock();
2765                                 goto errout;
2766                         }
2767
2768                         rcu_read_unlock();
2769                         status |= DO_SETLINK_NOTIFY;
2770                 }
2771         }
2772         err = 0;
2773
2774         if (tb[IFLA_PROTO_DOWN]) {
2775                 err = dev_change_proto_down(dev,
2776                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2777                 if (err)
2778                         goto errout;
2779                 status |= DO_SETLINK_NOTIFY;
2780         }
2781
2782         if (tb[IFLA_XDP]) {
2783                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2784                 u32 xdp_flags = 0;
2785
2786                 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
2787                                                   tb[IFLA_XDP],
2788                                                   ifla_xdp_policy, NULL);
2789                 if (err < 0)
2790                         goto errout;
2791
2792                 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2793                         err = -EINVAL;
2794                         goto errout;
2795                 }
2796
2797                 if (xdp[IFLA_XDP_FLAGS]) {
2798                         xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2799                         if (xdp_flags & ~XDP_FLAGS_MASK) {
2800                                 err = -EINVAL;
2801                                 goto errout;
2802                         }
2803                         if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2804                                 err = -EINVAL;
2805                                 goto errout;
2806                         }
2807                 }
2808
2809                 if (xdp[IFLA_XDP_FD]) {
2810                         int expected_fd = -1;
2811
2812                         if (xdp_flags & XDP_FLAGS_REPLACE) {
2813                                 if (!xdp[IFLA_XDP_EXPECTED_FD]) {
2814                                         err = -EINVAL;
2815                                         goto errout;
2816                                 }
2817                                 expected_fd =
2818                                         nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]);
2819                         }
2820
2821                         err = dev_change_xdp_fd(dev, extack,
2822                                                 nla_get_s32(xdp[IFLA_XDP_FD]),
2823                                                 expected_fd,
2824                                                 xdp_flags);
2825                         if (err)
2826                                 goto errout;
2827                         status |= DO_SETLINK_NOTIFY;
2828                 }
2829         }
2830
2831 errout:
2832         if (status & DO_SETLINK_MODIFIED) {
2833                 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2834                         netdev_state_change(dev);
2835
2836                 if (err < 0)
2837                         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",
2838                                              dev->name);
2839         }
2840
2841         return err;
2842 }
2843
2844 static struct net_device *rtnl_dev_get(struct net *net,
2845                                        struct nlattr *ifname_attr,
2846                                        struct nlattr *altifname_attr,
2847                                        char *ifname)
2848 {
2849         char buffer[ALTIFNAMSIZ];
2850
2851         if (!ifname) {
2852                 ifname = buffer;
2853                 if (ifname_attr)
2854                         nla_strlcpy(ifname, ifname_attr, IFNAMSIZ);
2855                 else if (altifname_attr)
2856                         nla_strlcpy(ifname, altifname_attr, ALTIFNAMSIZ);
2857                 else
2858                         return NULL;
2859         }
2860
2861         return __dev_get_by_name(net, ifname);
2862 }
2863
2864 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2865                         struct netlink_ext_ack *extack)
2866 {
2867         struct net *net = sock_net(skb->sk);
2868         struct ifinfomsg *ifm;
2869         struct net_device *dev;
2870         int err;
2871         struct nlattr *tb[IFLA_MAX+1];
2872         char ifname[IFNAMSIZ];
2873
2874         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2875                                      ifla_policy, extack);
2876         if (err < 0)
2877                 goto errout;
2878
2879         err = rtnl_ensure_unique_netns(tb, extack, false);
2880         if (err < 0)
2881                 goto errout;
2882
2883         if (tb[IFLA_IFNAME])
2884                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2885         else
2886                 ifname[0] = '\0';
2887
2888         err = -EINVAL;
2889         ifm = nlmsg_data(nlh);
2890         if (ifm->ifi_index > 0)
2891                 dev = __dev_get_by_index(net, ifm->ifi_index);
2892         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
2893                 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
2894         else
2895                 goto errout;
2896
2897         if (dev == NULL) {
2898                 err = -ENODEV;
2899                 goto errout;
2900         }
2901
2902         err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2903 errout:
2904         return err;
2905 }
2906
2907 static int rtnl_group_dellink(const struct net *net, int group)
2908 {
2909         struct net_device *dev, *aux;
2910         LIST_HEAD(list_kill);
2911         bool found = false;
2912
2913         if (!group)
2914                 return -EPERM;
2915
2916         for_each_netdev(net, dev) {
2917                 if (dev->group == group) {
2918                         const struct rtnl_link_ops *ops;
2919
2920                         found = true;
2921                         ops = dev->rtnl_link_ops;
2922                         if (!ops || !ops->dellink)
2923                                 return -EOPNOTSUPP;
2924                 }
2925         }
2926
2927         if (!found)
2928                 return -ENODEV;
2929
2930         for_each_netdev_safe(net, dev, aux) {
2931                 if (dev->group == group) {
2932                         const struct rtnl_link_ops *ops;
2933
2934                         ops = dev->rtnl_link_ops;
2935                         ops->dellink(dev, &list_kill);
2936                 }
2937         }
2938         unregister_netdevice_many(&list_kill);
2939
2940         return 0;
2941 }
2942
2943 int rtnl_delete_link(struct net_device *dev)
2944 {
2945         const struct rtnl_link_ops *ops;
2946         LIST_HEAD(list_kill);
2947
2948         ops = dev->rtnl_link_ops;
2949         if (!ops || !ops->dellink)
2950                 return -EOPNOTSUPP;
2951
2952         ops->dellink(dev, &list_kill);
2953         unregister_netdevice_many(&list_kill);
2954
2955         return 0;
2956 }
2957 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2958
2959 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2960                         struct netlink_ext_ack *extack)
2961 {
2962         struct net *net = sock_net(skb->sk);
2963         struct net *tgt_net = net;
2964         struct net_device *dev = NULL;
2965         struct ifinfomsg *ifm;
2966         struct nlattr *tb[IFLA_MAX+1];
2967         int err;
2968         int netnsid = -1;
2969
2970         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2971                                      ifla_policy, extack);
2972         if (err < 0)
2973                 return err;
2974
2975         err = rtnl_ensure_unique_netns(tb, extack, true);
2976         if (err < 0)
2977                 return err;
2978
2979         if (tb[IFLA_TARGET_NETNSID]) {
2980                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
2981                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
2982                 if (IS_ERR(tgt_net))
2983                         return PTR_ERR(tgt_net);
2984         }
2985
2986         err = -EINVAL;
2987         ifm = nlmsg_data(nlh);
2988         if (ifm->ifi_index > 0)
2989                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
2990         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
2991                 dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
2992                                    tb[IFLA_ALT_IFNAME], NULL);
2993         else if (tb[IFLA_GROUP])
2994                 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
2995         else
2996                 goto out;
2997
2998         if (!dev) {
2999                 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
3000                         err = -ENODEV;
3001
3002                 goto out;
3003         }
3004
3005         err = rtnl_delete_link(dev);
3006
3007 out:
3008         if (netnsid >= 0)
3009                 put_net(tgt_net);
3010
3011         return err;
3012 }
3013
3014 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
3015 {
3016         unsigned int old_flags;
3017         int err;
3018
3019         old_flags = dev->flags;
3020         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
3021                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
3022                                          NULL);
3023                 if (err < 0)
3024                         return err;
3025         }
3026
3027         if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
3028                 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
3029         } else {
3030                 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
3031                 __dev_notify_flags(dev, old_flags, ~0U);
3032         }
3033         return 0;
3034 }
3035 EXPORT_SYMBOL(rtnl_configure_link);
3036
3037 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
3038                                     unsigned char name_assign_type,
3039                                     const struct rtnl_link_ops *ops,
3040                                     struct nlattr *tb[],
3041                                     struct netlink_ext_ack *extack)
3042 {
3043         struct net_device *dev;
3044         unsigned int num_tx_queues = 1;
3045         unsigned int num_rx_queues = 1;
3046
3047         if (tb[IFLA_NUM_TX_QUEUES])
3048                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
3049         else if (ops->get_num_tx_queues)
3050                 num_tx_queues = ops->get_num_tx_queues();
3051
3052         if (tb[IFLA_NUM_RX_QUEUES])
3053                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
3054         else if (ops->get_num_rx_queues)
3055                 num_rx_queues = ops->get_num_rx_queues();
3056
3057         if (num_tx_queues < 1 || num_tx_queues > 4096) {
3058                 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
3059                 return ERR_PTR(-EINVAL);
3060         }
3061
3062         if (num_rx_queues < 1 || num_rx_queues > 4096) {
3063                 NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
3064                 return ERR_PTR(-EINVAL);
3065         }
3066
3067         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
3068                                ops->setup, num_tx_queues, num_rx_queues);
3069         if (!dev)
3070                 return ERR_PTR(-ENOMEM);
3071
3072         dev_net_set(dev, net);
3073         dev->rtnl_link_ops = ops;
3074         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
3075
3076         if (tb[IFLA_MTU]) {
3077                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3078                 int err;
3079
3080                 err = dev_validate_mtu(dev, mtu, extack);
3081                 if (err) {
3082                         free_netdev(dev);
3083                         return ERR_PTR(err);
3084                 }
3085                 dev->mtu = mtu;
3086         }
3087         if (tb[IFLA_ADDRESS]) {
3088                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
3089                                 nla_len(tb[IFLA_ADDRESS]));
3090                 dev->addr_assign_type = NET_ADDR_SET;
3091         }
3092         if (tb[IFLA_BROADCAST])
3093                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
3094                                 nla_len(tb[IFLA_BROADCAST]));
3095         if (tb[IFLA_TXQLEN])
3096                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
3097         if (tb[IFLA_OPERSTATE])
3098                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
3099         if (tb[IFLA_LINKMODE])
3100                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
3101         if (tb[IFLA_GROUP])
3102                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
3103         if (tb[IFLA_GSO_MAX_SIZE])
3104                 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
3105         if (tb[IFLA_GSO_MAX_SEGS])
3106                 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
3107
3108         return dev;
3109 }
3110 EXPORT_SYMBOL(rtnl_create_link);
3111
3112 static int rtnl_group_changelink(const struct sk_buff *skb,
3113                 struct net *net, int group,
3114                 struct ifinfomsg *ifm,
3115                 struct netlink_ext_ack *extack,
3116                 struct nlattr **tb)
3117 {
3118         struct net_device *dev, *aux;
3119         int err;
3120
3121         for_each_netdev_safe(net, dev, aux) {
3122                 if (dev->group == group) {
3123                         err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
3124                         if (err < 0)
3125                                 return err;
3126                 }
3127         }
3128
3129         return 0;
3130 }
3131
3132 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3133                           struct nlattr **attr, struct netlink_ext_ack *extack)
3134 {
3135         struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3136         unsigned char name_assign_type = NET_NAME_USER;
3137         struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
3138         const struct rtnl_link_ops *m_ops = NULL;
3139         struct net_device *master_dev = NULL;
3140         struct net *net = sock_net(skb->sk);
3141         const struct rtnl_link_ops *ops;
3142         struct nlattr *tb[IFLA_MAX + 1];
3143         struct net *dest_net, *link_net;
3144         struct nlattr **slave_data;
3145         char kind[MODULE_NAME_LEN];
3146         struct net_device *dev;
3147         struct ifinfomsg *ifm;
3148         char ifname[IFNAMSIZ];
3149         struct nlattr **data;
3150         int err;
3151
3152 #ifdef CONFIG_MODULES
3153 replay:
3154 #endif
3155         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3156                                      ifla_policy, extack);
3157         if (err < 0)
3158                 return err;
3159
3160         err = rtnl_ensure_unique_netns(tb, extack, false);
3161         if (err < 0)
3162                 return err;
3163
3164         if (tb[IFLA_IFNAME])
3165                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3166         else
3167                 ifname[0] = '\0';
3168
3169         ifm = nlmsg_data(nlh);
3170         if (ifm->ifi_index > 0)
3171                 dev = __dev_get_by_index(net, ifm->ifi_index);
3172         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3173                 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
3174         else
3175                 dev = NULL;
3176
3177         if (dev) {
3178                 master_dev = netdev_master_upper_dev_get(dev);
3179                 if (master_dev)
3180                         m_ops = master_dev->rtnl_link_ops;
3181         }
3182
3183         err = validate_linkmsg(dev, tb);
3184         if (err < 0)
3185                 return err;
3186
3187         if (tb[IFLA_LINKINFO]) {
3188                 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3189                                                   tb[IFLA_LINKINFO],
3190                                                   ifla_info_policy, NULL);
3191                 if (err < 0)
3192                         return err;
3193         } else
3194                 memset(linkinfo, 0, sizeof(linkinfo));
3195
3196         if (linkinfo[IFLA_INFO_KIND]) {
3197                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3198                 ops = rtnl_link_ops_get(kind);
3199         } else {
3200                 kind[0] = '\0';
3201                 ops = NULL;
3202         }
3203
3204         data = NULL;
3205         if (ops) {
3206                 if (ops->maxtype > RTNL_MAX_TYPE)
3207                         return -EINVAL;
3208
3209                 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3210                         err = nla_parse_nested_deprecated(attr, ops->maxtype,
3211                                                           linkinfo[IFLA_INFO_DATA],
3212                                                           ops->policy, extack);
3213                         if (err < 0)
3214                                 return err;
3215                         data = attr;
3216                 }
3217                 if (ops->validate) {
3218                         err = ops->validate(tb, data, extack);
3219                         if (err < 0)
3220                                 return err;
3221                 }
3222         }
3223
3224         slave_data = NULL;
3225         if (m_ops) {
3226                 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3227                         return -EINVAL;
3228
3229                 if (m_ops->slave_maxtype &&
3230                     linkinfo[IFLA_INFO_SLAVE_DATA]) {
3231                         err = nla_parse_nested_deprecated(slave_attr,
3232                                                           m_ops->slave_maxtype,
3233                                                           linkinfo[IFLA_INFO_SLAVE_DATA],
3234                                                           m_ops->slave_policy,
3235                                                           extack);
3236                         if (err < 0)
3237                                 return err;
3238                         slave_data = slave_attr;
3239                 }
3240         }
3241
3242         if (dev) {
3243                 int status = 0;
3244
3245                 if (nlh->nlmsg_flags & NLM_F_EXCL)
3246                         return -EEXIST;
3247                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3248                         return -EOPNOTSUPP;
3249
3250                 if (linkinfo[IFLA_INFO_DATA]) {
3251                         if (!ops || ops != dev->rtnl_link_ops ||
3252                             !ops->changelink)
3253                                 return -EOPNOTSUPP;
3254
3255                         err = ops->changelink(dev, tb, data, extack);
3256                         if (err < 0)
3257                                 return err;
3258                         status |= DO_SETLINK_NOTIFY;
3259                 }
3260
3261                 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3262                         if (!m_ops || !m_ops->slave_changelink)
3263                                 return -EOPNOTSUPP;
3264
3265                         err = m_ops->slave_changelink(master_dev, dev, tb,
3266                                                       slave_data, extack);
3267                         if (err < 0)
3268                                 return err;
3269                         status |= DO_SETLINK_NOTIFY;
3270                 }
3271
3272                 return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
3273         }
3274
3275         if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3276                 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3277                         return rtnl_group_changelink(skb, net,
3278                                                 nla_get_u32(tb[IFLA_GROUP]),
3279                                                 ifm, extack, tb);
3280                 return -ENODEV;
3281         }
3282
3283         if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3284                 return -EOPNOTSUPP;
3285
3286         if (!ops) {
3287 #ifdef CONFIG_MODULES
3288                 if (kind[0]) {
3289                         __rtnl_unlock();
3290                         request_module("rtnl-link-%s", kind);
3291                         rtnl_lock();
3292                         ops = rtnl_link_ops_get(kind);
3293                         if (ops)
3294                                 goto replay;
3295                 }
3296 #endif
3297                 NL_SET_ERR_MSG(extack, "Unknown device type");
3298                 return -EOPNOTSUPP;
3299         }
3300
3301         if (!ops->setup)
3302                 return -EOPNOTSUPP;
3303
3304         if (!ifname[0]) {
3305                 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3306                 name_assign_type = NET_NAME_ENUM;
3307         }
3308
3309         dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3310         if (IS_ERR(dest_net))
3311                 return PTR_ERR(dest_net);
3312
3313         if (tb[IFLA_LINK_NETNSID]) {
3314                 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3315
3316                 link_net = get_net_ns_by_id(dest_net, id);
3317                 if (!link_net) {
3318                         NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3319                         err =  -EINVAL;
3320                         goto out;
3321                 }
3322                 err = -EPERM;
3323                 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3324                         goto out;
3325         } else {
3326                 link_net = NULL;
3327         }
3328
3329         dev = rtnl_create_link(link_net ? : dest_net, ifname,
3330                                name_assign_type, ops, tb, extack);
3331         if (IS_ERR(dev)) {
3332                 err = PTR_ERR(dev);
3333                 goto out;
3334         }
3335
3336         dev->ifindex = ifm->ifi_index;
3337
3338         if (ops->newlink) {
3339                 err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3340                 /* Drivers should call free_netdev() in ->destructor
3341                  * and unregister it on failure after registration
3342                  * so that device could be finally freed in rtnl_unlock.
3343                  */
3344                 if (err < 0) {
3345                         /* If device is not registered at all, free it now */
3346                         if (dev->reg_state == NETREG_UNINITIALIZED)
3347                                 free_netdev(dev);
3348                         goto out;
3349                 }
3350         } else {
3351                 err = register_netdevice(dev);
3352                 if (err < 0) {
3353                         free_netdev(dev);
3354                         goto out;
3355                 }
3356         }
3357         err = rtnl_configure_link(dev, ifm);
3358         if (err < 0)
3359                 goto out_unregister;
3360         if (link_net) {
3361                 err = dev_change_net_namespace(dev, dest_net, ifname);
3362                 if (err < 0)
3363                         goto out_unregister;
3364         }
3365         if (tb[IFLA_MASTER]) {
3366                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3367                 if (err)
3368                         goto out_unregister;
3369         }
3370 out:
3371         if (link_net)
3372                 put_net(link_net);
3373         put_net(dest_net);
3374         return err;
3375 out_unregister:
3376         if (ops->newlink) {
3377                 LIST_HEAD(list_kill);
3378
3379                 ops->dellink(dev, &list_kill);
3380                 unregister_netdevice_many(&list_kill);
3381         } else {
3382                 unregister_netdevice(dev);
3383         }
3384         goto out;
3385 }
3386
3387 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3388                         struct netlink_ext_ack *extack)
3389 {
3390         struct nlattr **attr;
3391         int ret;
3392
3393         attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
3394         if (!attr)
3395                 return -ENOMEM;
3396
3397         ret = __rtnl_newlink(skb, nlh, attr, extack);
3398         kfree(attr);
3399         return ret;
3400 }
3401
3402 static int rtnl_valid_getlink_req(struct sk_buff *skb,
3403                                   const struct nlmsghdr *nlh,
3404                                   struct nlattr **tb,
3405                                   struct netlink_ext_ack *extack)
3406 {
3407         struct ifinfomsg *ifm;
3408         int i, err;
3409
3410         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3411                 NL_SET_ERR_MSG(extack, "Invalid header for get link");
3412                 return -EINVAL;
3413         }
3414
3415         if (!netlink_strict_get_check(skb))
3416                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3417                                               ifla_policy, extack);
3418
3419         ifm = nlmsg_data(nlh);
3420         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3421             ifm->ifi_change) {
3422                 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3423                 return -EINVAL;
3424         }
3425
3426         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3427                                             ifla_policy, extack);
3428         if (err)
3429                 return err;
3430
3431         for (i = 0; i <= IFLA_MAX; i++) {
3432                 if (!tb[i])
3433                         continue;
3434
3435                 switch (i) {
3436                 case IFLA_IFNAME:
3437                 case IFLA_ALT_IFNAME:
3438                 case IFLA_EXT_MASK:
3439                 case IFLA_TARGET_NETNSID:
3440                         break;
3441                 default:
3442                         NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3443                         return -EINVAL;
3444                 }
3445         }
3446
3447         return 0;
3448 }
3449
3450 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3451                         struct netlink_ext_ack *extack)
3452 {
3453         struct net *net = sock_net(skb->sk);
3454         struct net *tgt_net = net;
3455         struct ifinfomsg *ifm;
3456         struct nlattr *tb[IFLA_MAX+1];
3457         struct net_device *dev = NULL;
3458         struct sk_buff *nskb;
3459         int netnsid = -1;
3460         int err;
3461         u32 ext_filter_mask = 0;
3462
3463         err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3464         if (err < 0)
3465                 return err;
3466
3467         err = rtnl_ensure_unique_netns(tb, extack, true);
3468         if (err < 0)
3469                 return err;
3470
3471         if (tb[IFLA_TARGET_NETNSID]) {
3472                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3473                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3474                 if (IS_ERR(tgt_net))
3475                         return PTR_ERR(tgt_net);
3476         }
3477
3478         if (tb[IFLA_EXT_MASK])
3479                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3480
3481         err = -EINVAL;
3482         ifm = nlmsg_data(nlh);
3483         if (ifm->ifi_index > 0)
3484                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3485         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3486                 dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME],
3487                                    tb[IFLA_ALT_IFNAME], NULL);
3488         else
3489                 goto out;
3490
3491         err = -ENODEV;
3492         if (dev == NULL)
3493                 goto out;
3494
3495         err = -ENOBUFS;
3496         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3497         if (nskb == NULL)
3498                 goto out;
3499
3500         err = rtnl_fill_ifinfo(nskb, dev, net,
3501                                RTM_NEWLINK, NETLINK_CB(skb).portid,
3502                                nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3503                                0, NULL, 0, netnsid, GFP_KERNEL);
3504         if (err < 0) {
3505                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3506                 WARN_ON(err == -EMSGSIZE);
3507                 kfree_skb(nskb);
3508         } else
3509                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3510 out:
3511         if (netnsid >= 0)
3512                 put_net(tgt_net);
3513
3514         return err;
3515 }
3516
3517 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
3518                            bool *changed, struct netlink_ext_ack *extack)
3519 {
3520         char *alt_ifname;
3521         int err;
3522
3523         err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
3524         if (err)
3525                 return err;
3526
3527         alt_ifname = nla_strdup(attr, GFP_KERNEL);
3528         if (!alt_ifname)
3529                 return -ENOMEM;
3530
3531         if (cmd == RTM_NEWLINKPROP) {
3532                 err = netdev_name_node_alt_create(dev, alt_ifname);
3533                 if (!err)
3534                         alt_ifname = NULL;
3535         } else if (cmd == RTM_DELLINKPROP) {
3536                 err = netdev_name_node_alt_destroy(dev, alt_ifname);
3537         } else {
3538                 WARN_ON_ONCE(1);
3539                 err = -EINVAL;
3540         }
3541
3542         kfree(alt_ifname);
3543         if (!err)
3544                 *changed = true;
3545         return err;
3546 }
3547
3548 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
3549                          struct netlink_ext_ack *extack)
3550 {
3551         struct net *net = sock_net(skb->sk);
3552         struct nlattr *tb[IFLA_MAX + 1];
3553         struct net_device *dev;
3554         struct ifinfomsg *ifm;
3555         bool changed = false;
3556         struct nlattr *attr;
3557         int err, rem;
3558
3559         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3560         if (err)
3561                 return err;
3562
3563         err = rtnl_ensure_unique_netns(tb, extack, true);
3564         if (err)
3565                 return err;
3566
3567         ifm = nlmsg_data(nlh);
3568         if (ifm->ifi_index > 0)
3569                 dev = __dev_get_by_index(net, ifm->ifi_index);
3570         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3571                 dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
3572                                    tb[IFLA_ALT_IFNAME], NULL);
3573         else
3574                 return -EINVAL;
3575
3576         if (!dev)
3577                 return -ENODEV;
3578
3579         if (!tb[IFLA_PROP_LIST])
3580                 return 0;
3581
3582         nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
3583                 switch (nla_type(attr)) {
3584                 case IFLA_ALT_IFNAME:
3585                         err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
3586                         if (err)
3587                                 return err;
3588                         break;
3589                 }
3590         }
3591
3592         if (changed)
3593                 netdev_state_change(dev);
3594         return 0;
3595 }
3596
3597 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3598                             struct netlink_ext_ack *extack)
3599 {
3600         return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
3601 }
3602
3603 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3604                             struct netlink_ext_ack *extack)
3605 {
3606         return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
3607 }
3608
3609 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3610 {
3611         struct net *net = sock_net(skb->sk);
3612         struct net_device *dev;
3613         struct nlattr *tb[IFLA_MAX+1];
3614         u32 ext_filter_mask = 0;
3615         u16 min_ifinfo_dump_size = 0;
3616         int hdrlen;
3617
3618         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3619         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3620                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3621
3622         if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3623                 if (tb[IFLA_EXT_MASK])
3624                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3625         }
3626
3627         if (!ext_filter_mask)
3628                 return NLMSG_GOODSIZE;
3629         /*
3630          * traverse the list of net devices and compute the minimum
3631          * buffer size based upon the filter mask.
3632          */
3633         rcu_read_lock();
3634         for_each_netdev_rcu(net, dev) {
3635                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
3636                                              if_nlmsg_size(dev,
3637                                                            ext_filter_mask));
3638         }
3639         rcu_read_unlock();
3640
3641         return nlmsg_total_size(min_ifinfo_dump_size);
3642 }
3643
3644 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3645 {
3646         int idx;
3647         int s_idx = cb->family;
3648         int type = cb->nlh->nlmsg_type - RTM_BASE;
3649         int ret = 0;
3650
3651         if (s_idx == 0)
3652                 s_idx = 1;
3653
3654         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3655                 struct rtnl_link **tab;
3656                 struct rtnl_link *link;
3657                 rtnl_dumpit_func dumpit;
3658
3659                 if (idx < s_idx || idx == PF_PACKET)
3660                         continue;
3661
3662                 if (type < 0 || type >= RTM_NR_MSGTYPES)
3663                         continue;
3664
3665                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3666                 if (!tab)
3667                         continue;
3668
3669                 link = tab[type];
3670                 if (!link)
3671                         continue;
3672
3673                 dumpit = link->dumpit;
3674                 if (!dumpit)
3675                         continue;
3676
3677                 if (idx > s_idx) {
3678                         memset(&cb->args[0], 0, sizeof(cb->args));
3679                         cb->prev_seq = 0;
3680                         cb->seq = 0;
3681                 }
3682                 ret = dumpit(skb, cb);
3683                 if (ret)
3684                         break;
3685         }
3686         cb->family = idx;
3687
3688         return skb->len ? : ret;
3689 }
3690
3691 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3692                                        unsigned int change,
3693                                        u32 event, gfp_t flags, int *new_nsid,
3694                                        int new_ifindex)
3695 {
3696         struct net *net = dev_net(dev);
3697         struct sk_buff *skb;
3698         int err = -ENOBUFS;
3699         size_t if_info_size;
3700
3701         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3702         if (skb == NULL)
3703                 goto errout;
3704
3705         err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3706                                type, 0, 0, change, 0, 0, event,
3707                                new_nsid, new_ifindex, -1, flags);
3708         if (err < 0) {
3709                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3710                 WARN_ON(err == -EMSGSIZE);
3711                 kfree_skb(skb);
3712                 goto errout;
3713         }
3714         return skb;
3715 errout:
3716         if (err < 0)
3717                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3718         return NULL;
3719 }
3720
3721 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3722 {
3723         struct net *net = dev_net(dev);
3724
3725         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3726 }
3727
3728 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3729                                unsigned int change, u32 event,
3730                                gfp_t flags, int *new_nsid, int new_ifindex)
3731 {
3732         struct sk_buff *skb;
3733
3734         if (dev->reg_state != NETREG_REGISTERED)
3735                 return;
3736
3737         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3738                                      new_ifindex);
3739         if (skb)
3740                 rtmsg_ifinfo_send(skb, dev, flags);
3741 }
3742
3743 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3744                   gfp_t flags)
3745 {
3746         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3747                            NULL, 0);
3748 }
3749
3750 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3751                          gfp_t flags, int *new_nsid, int new_ifindex)
3752 {
3753         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3754                            new_nsid, new_ifindex);
3755 }
3756
3757 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3758                                    struct net_device *dev,
3759                                    u8 *addr, u16 vid, u32 pid, u32 seq,
3760                                    int type, unsigned int flags,
3761                                    int nlflags, u16 ndm_state)
3762 {
3763         struct nlmsghdr *nlh;
3764         struct ndmsg *ndm;
3765
3766         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3767         if (!nlh)
3768                 return -EMSGSIZE;
3769
3770         ndm = nlmsg_data(nlh);
3771         ndm->ndm_family  = AF_BRIDGE;
3772         ndm->ndm_pad1    = 0;
3773         ndm->ndm_pad2    = 0;
3774         ndm->ndm_flags   = flags;
3775         ndm->ndm_type    = 0;
3776         ndm->ndm_ifindex = dev->ifindex;
3777         ndm->ndm_state   = ndm_state;
3778
3779         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3780                 goto nla_put_failure;
3781         if (vid)
3782                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3783                         goto nla_put_failure;
3784
3785         nlmsg_end(skb, nlh);
3786         return 0;
3787
3788 nla_put_failure:
3789         nlmsg_cancel(skb, nlh);
3790         return -EMSGSIZE;
3791 }
3792
3793 static inline size_t rtnl_fdb_nlmsg_size(void)
3794 {
3795         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3796                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
3797                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
3798                0;
3799 }
3800
3801 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3802                             u16 ndm_state)
3803 {
3804         struct net *net = dev_net(dev);
3805         struct sk_buff *skb;
3806         int err = -ENOBUFS;
3807
3808         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3809         if (!skb)
3810                 goto errout;
3811
3812         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3813                                       0, 0, type, NTF_SELF, 0, ndm_state);
3814         if (err < 0) {
3815                 kfree_skb(skb);
3816                 goto errout;
3817         }
3818
3819         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3820         return;
3821 errout:
3822         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3823 }
3824
3825 /*
3826  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3827  */
3828 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3829                      struct nlattr *tb[],
3830                      struct net_device *dev,
3831                      const unsigned char *addr, u16 vid,
3832                      u16 flags)
3833 {
3834         int err = -EINVAL;
3835
3836         /* If aging addresses are supported device will need to
3837          * implement its own handler for this.
3838          */
3839         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3840                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3841                 return err;
3842         }
3843
3844         if (vid) {
3845                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3846                 return err;
3847         }
3848
3849         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3850                 err = dev_uc_add_excl(dev, addr);
3851         else if (is_multicast_ether_addr(addr))
3852                 err = dev_mc_add_excl(dev, addr);
3853
3854         /* Only return duplicate errors if NLM_F_EXCL is set */
3855         if (err == -EEXIST && !(flags & NLM_F_EXCL))
3856                 err = 0;
3857
3858         return err;
3859 }
3860 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3861
3862 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3863                          struct netlink_ext_ack *extack)
3864 {
3865         u16 vid = 0;
3866
3867         if (vlan_attr) {
3868                 if (nla_len(vlan_attr) != sizeof(u16)) {
3869                         NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3870                         return -EINVAL;
3871                 }
3872
3873                 vid = nla_get_u16(vlan_attr);
3874
3875                 if (!vid || vid >= VLAN_VID_MASK) {
3876                         NL_SET_ERR_MSG(extack, "invalid vlan id");
3877                         return -EINVAL;
3878                 }
3879         }
3880         *p_vid = vid;
3881         return 0;
3882 }
3883
3884 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3885                         struct netlink_ext_ack *extack)
3886 {
3887         struct net *net = sock_net(skb->sk);
3888         struct ndmsg *ndm;
3889         struct nlattr *tb[NDA_MAX+1];
3890         struct net_device *dev;
3891         u8 *addr;
3892         u16 vid;
3893         int err;
3894
3895         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3896                                      extack);
3897         if (err < 0)
3898                 return err;
3899
3900         ndm = nlmsg_data(nlh);
3901         if (ndm->ndm_ifindex == 0) {
3902                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3903                 return -EINVAL;
3904         }
3905
3906         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3907         if (dev == NULL) {
3908                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3909                 return -ENODEV;
3910         }
3911
3912         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3913                 NL_SET_ERR_MSG(extack, "invalid address");
3914                 return -EINVAL;
3915         }
3916
3917         if (dev->type != ARPHRD_ETHER) {
3918                 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
3919                 return -EINVAL;
3920         }
3921
3922         addr = nla_data(tb[NDA_LLADDR]);
3923
3924         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3925         if (err)
3926                 return err;
3927
3928         err = -EOPNOTSUPP;
3929
3930         /* Support fdb on master device the net/bridge default case */
3931         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3932             netif_is_bridge_port(dev)) {
3933                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3934                 const struct net_device_ops *ops = br_dev->netdev_ops;
3935
3936                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3937                                        nlh->nlmsg_flags, extack);
3938                 if (err)
3939                         goto out;
3940                 else
3941                         ndm->ndm_flags &= ~NTF_MASTER;
3942         }
3943
3944         /* Embedded bridge, macvlan, and any other device support */
3945         if ((ndm->ndm_flags & NTF_SELF)) {
3946                 if (dev->netdev_ops->ndo_fdb_add)
3947                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3948                                                            vid,
3949                                                            nlh->nlmsg_flags,
3950                                                            extack);
3951                 else
3952                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3953                                                nlh->nlmsg_flags);
3954
3955                 if (!err) {
3956                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3957                                         ndm->ndm_state);
3958                         ndm->ndm_flags &= ~NTF_SELF;
3959                 }
3960         }
3961 out:
3962         return err;
3963 }
3964
3965 /*
3966  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3967  */
3968 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3969                      struct nlattr *tb[],
3970                      struct net_device *dev,
3971                      const unsigned char *addr, u16 vid)
3972 {
3973         int err = -EINVAL;
3974
3975         /* If aging addresses are supported device will need to
3976          * implement its own handler for this.
3977          */
3978         if (!(ndm->ndm_state & NUD_PERMANENT)) {
3979                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3980                 return err;
3981         }
3982
3983         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3984                 err = dev_uc_del(dev, addr);
3985         else if (is_multicast_ether_addr(addr))
3986                 err = dev_mc_del(dev, addr);
3987
3988         return err;
3989 }
3990 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3991
3992 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3993                         struct netlink_ext_ack *extack)
3994 {
3995         struct net *net = sock_net(skb->sk);
3996         struct ndmsg *ndm;
3997         struct nlattr *tb[NDA_MAX+1];
3998         struct net_device *dev;
3999         __u8 *addr;
4000         int err;
4001         u16 vid;
4002
4003         if (!netlink_capable(skb, CAP_NET_ADMIN))
4004                 return -EPERM;
4005
4006         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
4007                                      extack);
4008         if (err < 0)
4009                 return err;
4010
4011         ndm = nlmsg_data(nlh);
4012         if (ndm->ndm_ifindex == 0) {
4013                 NL_SET_ERR_MSG(extack, "invalid ifindex");
4014                 return -EINVAL;
4015         }
4016
4017         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4018         if (dev == NULL) {
4019                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4020                 return -ENODEV;
4021         }
4022
4023         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4024                 NL_SET_ERR_MSG(extack, "invalid address");
4025                 return -EINVAL;
4026         }
4027
4028         if (dev->type != ARPHRD_ETHER) {
4029                 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
4030                 return -EINVAL;
4031         }
4032
4033         addr = nla_data(tb[NDA_LLADDR]);
4034
4035         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4036         if (err)
4037                 return err;
4038
4039         err = -EOPNOTSUPP;
4040
4041         /* Support fdb on master device the net/bridge default case */
4042         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4043             netif_is_bridge_port(dev)) {
4044                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4045                 const struct net_device_ops *ops = br_dev->netdev_ops;
4046
4047                 if (ops->ndo_fdb_del)
4048                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
4049
4050                 if (err)
4051                         goto out;
4052                 else
4053                         ndm->ndm_flags &= ~NTF_MASTER;
4054         }
4055
4056         /* Embedded bridge, macvlan, and any other device support */
4057         if (ndm->ndm_flags & NTF_SELF) {
4058                 if (dev->netdev_ops->ndo_fdb_del)
4059                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
4060                                                            vid);
4061                 else
4062                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
4063
4064                 if (!err) {
4065                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
4066                                         ndm->ndm_state);
4067                         ndm->ndm_flags &= ~NTF_SELF;
4068                 }
4069         }
4070 out:
4071         return err;
4072 }
4073
4074 static int nlmsg_populate_fdb(struct sk_buff *skb,
4075                               struct netlink_callback *cb,
4076                               struct net_device *dev,
4077                               int *idx,
4078                               struct netdev_hw_addr_list *list)
4079 {
4080         struct netdev_hw_addr *ha;
4081         int err;
4082         u32 portid, seq;
4083
4084         portid = NETLINK_CB(cb->skb).portid;
4085         seq = cb->nlh->nlmsg_seq;
4086
4087         list_for_each_entry(ha, &list->list, list) {
4088                 if (*idx < cb->args[2])
4089                         goto skip;
4090
4091                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
4092                                               portid, seq,
4093                                               RTM_NEWNEIGH, NTF_SELF,
4094                                               NLM_F_MULTI, NUD_PERMANENT);
4095                 if (err < 0)
4096                         return err;
4097 skip:
4098                 *idx += 1;
4099         }
4100         return 0;
4101 }
4102
4103 /**
4104  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
4105  * @skb: socket buffer to store message in
4106  * @cb: netlink callback
4107  * @dev: netdevice
4108  * @filter_dev: ignored
4109  * @idx: the number of FDB table entries dumped is added to *@idx
4110  *
4111  * Default netdevice operation to dump the existing unicast address list.
4112  * Returns number of addresses from list put in skb.
4113  */
4114 int ndo_dflt_fdb_dump(struct sk_buff *skb,
4115                       struct netlink_callback *cb,
4116                       struct net_device *dev,
4117                       struct net_device *filter_dev,
4118                       int *idx)
4119 {
4120         int err;
4121
4122         if (dev->type != ARPHRD_ETHER)
4123                 return -EINVAL;
4124
4125         netif_addr_lock_bh(dev);
4126         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
4127         if (err)
4128                 goto out;
4129         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
4130 out:
4131         netif_addr_unlock_bh(dev);
4132         return err;
4133 }
4134 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
4135
4136 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
4137                                  int *br_idx, int *brport_idx,
4138                                  struct netlink_ext_ack *extack)
4139 {
4140         struct nlattr *tb[NDA_MAX + 1];
4141         struct ndmsg *ndm;
4142         int err, i;
4143
4144         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4145                 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
4146                 return -EINVAL;
4147         }
4148
4149         ndm = nlmsg_data(nlh);
4150         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4151             ndm->ndm_flags || ndm->ndm_type) {
4152                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
4153                 return -EINVAL;
4154         }
4155
4156         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4157                                             NDA_MAX, NULL, extack);
4158         if (err < 0)
4159                 return err;
4160
4161         *brport_idx = ndm->ndm_ifindex;
4162         for (i = 0; i <= NDA_MAX; ++i) {
4163                 if (!tb[i])
4164                         continue;
4165
4166                 switch (i) {
4167                 case NDA_IFINDEX:
4168                         if (nla_len(tb[i]) != sizeof(u32)) {
4169                                 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
4170                                 return -EINVAL;
4171                         }
4172                         *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
4173                         break;
4174                 case NDA_MASTER:
4175                         if (nla_len(tb[i]) != sizeof(u32)) {
4176                                 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
4177                                 return -EINVAL;
4178                         }
4179                         *br_idx = nla_get_u32(tb[NDA_MASTER]);
4180                         break;
4181                 default:
4182                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
4183                         return -EINVAL;
4184                 }
4185         }
4186
4187         return 0;
4188 }
4189
4190 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
4191                                  int *br_idx, int *brport_idx,
4192                                  struct netlink_ext_ack *extack)
4193 {
4194         struct nlattr *tb[IFLA_MAX+1];
4195         int err;
4196
4197         /* A hack to preserve kernel<->userspace interface.
4198          * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
4199          * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
4200          * So, check for ndmsg with an optional u32 attribute (not used here).
4201          * Fortunately these sizes don't conflict with the size of ifinfomsg
4202          * with an optional attribute.
4203          */
4204         if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
4205             (nlmsg_len(nlh) != sizeof(struct ndmsg) +
4206              nla_attr_size(sizeof(u32)))) {
4207                 struct ifinfomsg *ifm;
4208
4209                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4210                                              tb, IFLA_MAX, ifla_policy,
4211                                              extack);
4212                 if (err < 0) {
4213                         return -EINVAL;
4214                 } else if (err == 0) {
4215                         if (tb[IFLA_MASTER])
4216                                 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
4217                 }
4218
4219                 ifm = nlmsg_data(nlh);
4220                 *brport_idx = ifm->ifi_index;
4221         }
4222         return 0;
4223 }
4224
4225 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
4226 {
4227         struct net_device *dev;
4228         struct net_device *br_dev = NULL;
4229         const struct net_device_ops *ops = NULL;
4230         const struct net_device_ops *cops = NULL;
4231         struct net *net = sock_net(skb->sk);
4232         struct hlist_head *head;
4233         int brport_idx = 0;
4234         int br_idx = 0;
4235         int h, s_h;
4236         int idx = 0, s_idx;
4237         int err = 0;
4238         int fidx = 0;
4239
4240         if (cb->strict_check)
4241                 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4242                                             cb->extack);
4243         else
4244                 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4245                                             cb->extack);
4246         if (err < 0)
4247                 return err;
4248
4249         if (br_idx) {
4250                 br_dev = __dev_get_by_index(net, br_idx);
4251                 if (!br_dev)
4252                         return -ENODEV;
4253
4254                 ops = br_dev->netdev_ops;
4255         }
4256
4257         s_h = cb->args[0];
4258         s_idx = cb->args[1];
4259
4260         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4261                 idx = 0;
4262                 head = &net->dev_index_head[h];
4263                 hlist_for_each_entry(dev, head, index_hlist) {
4264
4265                         if (brport_idx && (dev->ifindex != brport_idx))
4266                                 continue;
4267
4268                         if (!br_idx) { /* user did not specify a specific bridge */
4269                                 if (netif_is_bridge_port(dev)) {
4270                                         br_dev = netdev_master_upper_dev_get(dev);
4271                                         cops = br_dev->netdev_ops;
4272                                 }
4273                         } else {
4274                                 if (dev != br_dev &&
4275                                     !netif_is_bridge_port(dev))
4276                                         continue;
4277
4278                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
4279                                     !(dev->priv_flags & IFF_EBRIDGE))
4280                                         continue;
4281                                 cops = ops;
4282                         }
4283
4284                         if (idx < s_idx)
4285                                 goto cont;
4286
4287                         if (netif_is_bridge_port(dev)) {
4288                                 if (cops && cops->ndo_fdb_dump) {
4289                                         err = cops->ndo_fdb_dump(skb, cb,
4290                                                                 br_dev, dev,
4291                                                                 &fidx);
4292                                         if (err == -EMSGSIZE)
4293                                                 goto out;
4294                                 }
4295                         }
4296
4297                         if (dev->netdev_ops->ndo_fdb_dump)
4298                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4299                                                                     dev, NULL,
4300                                                                     &fidx);
4301                         else
4302                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4303                                                         &fidx);
4304                         if (err == -EMSGSIZE)
4305                                 goto out;
4306
4307                         cops = NULL;
4308
4309                         /* reset fdb offset to 0 for rest of the interfaces */
4310                         cb->args[2] = 0;
4311                         fidx = 0;
4312 cont:
4313                         idx++;
4314                 }
4315         }
4316
4317 out:
4318         cb->args[0] = h;
4319         cb->args[1] = idx;
4320         cb->args[2] = fidx;
4321
4322         return skb->len;
4323 }
4324
4325 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4326                                 struct nlattr **tb, u8 *ndm_flags,
4327                                 int *br_idx, int *brport_idx, u8 **addr,
4328                                 u16 *vid, struct netlink_ext_ack *extack)
4329 {
4330         struct ndmsg *ndm;
4331         int err, i;
4332
4333         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4334                 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4335                 return -EINVAL;
4336         }
4337
4338         ndm = nlmsg_data(nlh);
4339         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4340             ndm->ndm_type) {
4341                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4342                 return -EINVAL;
4343         }
4344
4345         if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4346                 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4347                 return -EINVAL;
4348         }
4349
4350         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4351                                             NDA_MAX, nda_policy, extack);
4352         if (err < 0)
4353                 return err;
4354
4355         *ndm_flags = ndm->ndm_flags;
4356         *brport_idx = ndm->ndm_ifindex;
4357         for (i = 0; i <= NDA_MAX; ++i) {
4358                 if (!tb[i])
4359                         continue;
4360
4361                 switch (i) {
4362                 case NDA_MASTER:
4363                         *br_idx = nla_get_u32(tb[i]);
4364                         break;
4365                 case NDA_LLADDR:
4366                         if (nla_len(tb[i]) != ETH_ALEN) {
4367                                 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4368                                 return -EINVAL;
4369                         }
4370                         *addr = nla_data(tb[i]);
4371                         break;
4372                 case NDA_VLAN:
4373                         err = fdb_vid_parse(tb[i], vid, extack);
4374                         if (err)
4375                                 return err;
4376                         break;
4377                 case NDA_VNI:
4378                         break;
4379                 default:
4380                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4381                         return -EINVAL;
4382                 }
4383         }
4384
4385         return 0;
4386 }
4387
4388 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4389                         struct netlink_ext_ack *extack)
4390 {
4391         struct net_device *dev = NULL, *br_dev = NULL;
4392         const struct net_device_ops *ops = NULL;
4393         struct net *net = sock_net(in_skb->sk);
4394         struct nlattr *tb[NDA_MAX + 1];
4395         struct sk_buff *skb;
4396         int brport_idx = 0;
4397         u8 ndm_flags = 0;
4398         int br_idx = 0;
4399         u8 *addr = NULL;
4400         u16 vid = 0;
4401         int err;
4402
4403         err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4404                                    &brport_idx, &addr, &vid, extack);
4405         if (err < 0)
4406                 return err;
4407
4408         if (!addr) {
4409                 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4410                 return -EINVAL;
4411         }
4412
4413         if (brport_idx) {
4414                 dev = __dev_get_by_index(net, brport_idx);
4415                 if (!dev) {
4416                         NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4417                         return -ENODEV;
4418                 }
4419         }
4420
4421         if (br_idx) {
4422                 if (dev) {
4423                         NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4424                         return -EINVAL;
4425                 }
4426
4427                 br_dev = __dev_get_by_index(net, br_idx);
4428                 if (!br_dev) {
4429                         NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4430                         return -EINVAL;
4431                 }
4432                 ops = br_dev->netdev_ops;
4433         }
4434
4435         if (dev) {
4436                 if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4437                         if (!netif_is_bridge_port(dev)) {
4438                                 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4439                                 return -EINVAL;
4440                         }
4441                         br_dev = netdev_master_upper_dev_get(dev);
4442                         if (!br_dev) {
4443                                 NL_SET_ERR_MSG(extack, "Master of device not found");
4444                                 return -EINVAL;
4445                         }
4446                         ops = br_dev->netdev_ops;
4447                 } else {
4448                         if (!(ndm_flags & NTF_SELF)) {
4449                                 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4450                                 return -EINVAL;
4451                         }
4452                         ops = dev->netdev_ops;
4453                 }
4454         }
4455
4456         if (!br_dev && !dev) {
4457                 NL_SET_ERR_MSG(extack, "No device specified");
4458                 return -ENODEV;
4459         }
4460
4461         if (!ops || !ops->ndo_fdb_get) {
4462                 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4463                 return -EOPNOTSUPP;
4464         }
4465
4466         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4467         if (!skb)
4468                 return -ENOBUFS;
4469
4470         if (br_dev)
4471                 dev = br_dev;
4472         err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4473                                NETLINK_CB(in_skb).portid,
4474                                nlh->nlmsg_seq, extack);
4475         if (err)
4476                 goto out;
4477
4478         return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4479 out:
4480         kfree_skb(skb);
4481         return err;
4482 }
4483
4484 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4485                                unsigned int attrnum, unsigned int flag)
4486 {
4487         if (mask & flag)
4488                 return nla_put_u8(skb, attrnum, !!(flags & flag));
4489         return 0;
4490 }
4491
4492 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4493                             struct net_device *dev, u16 mode,
4494                             u32 flags, u32 mask, int nlflags,
4495                             u32 filter_mask,
4496                             int (*vlan_fill)(struct sk_buff *skb,
4497                                              struct net_device *dev,
4498                                              u32 filter_mask))
4499 {
4500         struct nlmsghdr *nlh;
4501         struct ifinfomsg *ifm;
4502         struct nlattr *br_afspec;
4503         struct nlattr *protinfo;
4504         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4505         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4506         int err = 0;
4507
4508         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4509         if (nlh == NULL)
4510                 return -EMSGSIZE;
4511
4512         ifm = nlmsg_data(nlh);
4513         ifm->ifi_family = AF_BRIDGE;
4514         ifm->__ifi_pad = 0;
4515         ifm->ifi_type = dev->type;
4516         ifm->ifi_index = dev->ifindex;
4517         ifm->ifi_flags = dev_get_flags(dev);
4518         ifm->ifi_change = 0;
4519
4520
4521         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4522             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4523             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4524             (br_dev &&
4525              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4526             (dev->addr_len &&
4527              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4528             (dev->ifindex != dev_get_iflink(dev) &&
4529              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4530                 goto nla_put_failure;
4531
4532         br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4533         if (!br_afspec)
4534                 goto nla_put_failure;
4535
4536         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4537                 nla_nest_cancel(skb, br_afspec);
4538                 goto nla_put_failure;
4539         }
4540
4541         if (mode != BRIDGE_MODE_UNDEF) {
4542                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4543                         nla_nest_cancel(skb, br_afspec);
4544                         goto nla_put_failure;
4545                 }
4546         }
4547         if (vlan_fill) {
4548                 err = vlan_fill(skb, dev, filter_mask);
4549                 if (err) {
4550                         nla_nest_cancel(skb, br_afspec);
4551                         goto nla_put_failure;
4552                 }
4553         }
4554         nla_nest_end(skb, br_afspec);
4555
4556         protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4557         if (!protinfo)
4558                 goto nla_put_failure;
4559
4560         if (brport_nla_put_flag(skb, flags, mask,
4561                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4562             brport_nla_put_flag(skb, flags, mask,
4563                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4564             brport_nla_put_flag(skb, flags, mask,
4565                                 IFLA_BRPORT_FAST_LEAVE,
4566                                 BR_MULTICAST_FAST_LEAVE) ||
4567             brport_nla_put_flag(skb, flags, mask,
4568                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4569             brport_nla_put_flag(skb, flags, mask,
4570                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4571             brport_nla_put_flag(skb, flags, mask,
4572                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4573             brport_nla_put_flag(skb, flags, mask,
4574                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4575             brport_nla_put_flag(skb, flags, mask,
4576                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP) ||
4577             brport_nla_put_flag(skb, flags, mask,
4578                                 IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) ||
4579             brport_nla_put_flag(skb, flags, mask,
4580                                 IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) {
4581                 nla_nest_cancel(skb, protinfo);
4582                 goto nla_put_failure;
4583         }
4584
4585         nla_nest_end(skb, protinfo);
4586
4587         nlmsg_end(skb, nlh);
4588         return 0;
4589 nla_put_failure:
4590         nlmsg_cancel(skb, nlh);
4591         return err ? err : -EMSGSIZE;
4592 }
4593 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4594
4595 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4596                                     bool strict_check, u32 *filter_mask,
4597                                     struct netlink_ext_ack *extack)
4598 {
4599         struct nlattr *tb[IFLA_MAX+1];
4600         int err, i;
4601
4602         if (strict_check) {
4603                 struct ifinfomsg *ifm;
4604
4605                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4606                         NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4607                         return -EINVAL;
4608                 }
4609
4610                 ifm = nlmsg_data(nlh);
4611                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4612                     ifm->ifi_change || ifm->ifi_index) {
4613                         NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4614                         return -EINVAL;
4615                 }
4616
4617                 err = nlmsg_parse_deprecated_strict(nlh,
4618                                                     sizeof(struct ifinfomsg),
4619                                                     tb, IFLA_MAX, ifla_policy,
4620                                                     extack);
4621         } else {
4622                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4623                                              tb, IFLA_MAX, ifla_policy,
4624                                              extack);
4625         }
4626         if (err < 0)
4627                 return err;
4628
4629         /* new attributes should only be added with strict checking */
4630         for (i = 0; i <= IFLA_MAX; ++i) {
4631                 if (!tb[i])
4632                         continue;
4633
4634                 switch (i) {
4635                 case IFLA_EXT_MASK:
4636                         *filter_mask = nla_get_u32(tb[i]);
4637                         break;
4638                 default:
4639                         if (strict_check) {
4640                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4641                                 return -EINVAL;
4642                         }
4643                 }
4644         }
4645
4646         return 0;
4647 }
4648
4649 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4650 {
4651         const struct nlmsghdr *nlh = cb->nlh;
4652         struct net *net = sock_net(skb->sk);
4653         struct net_device *dev;
4654         int idx = 0;
4655         u32 portid = NETLINK_CB(cb->skb).portid;
4656         u32 seq = nlh->nlmsg_seq;
4657         u32 filter_mask = 0;
4658         int err;
4659
4660         err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4661                                        cb->extack);
4662         if (err < 0 && cb->strict_check)
4663                 return err;
4664
4665         rcu_read_lock();
4666         for_each_netdev_rcu(net, dev) {
4667                 const struct net_device_ops *ops = dev->netdev_ops;
4668                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4669
4670                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4671                         if (idx >= cb->args[0]) {
4672                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
4673                                                 skb, portid, seq, dev,
4674                                                 filter_mask, NLM_F_MULTI);
4675                                 if (err < 0 && err != -EOPNOTSUPP) {
4676                                         if (likely(skb->len))
4677                                                 break;
4678
4679                                         goto out_err;
4680                                 }
4681                         }
4682                         idx++;
4683                 }
4684
4685                 if (ops->ndo_bridge_getlink) {
4686                         if (idx >= cb->args[0]) {
4687                                 err = ops->ndo_bridge_getlink(skb, portid,
4688                                                               seq, dev,
4689                                                               filter_mask,
4690                                                               NLM_F_MULTI);
4691                                 if (err < 0 && err != -EOPNOTSUPP) {
4692                                         if (likely(skb->len))
4693                                                 break;
4694
4695                                         goto out_err;
4696                                 }
4697                         }
4698                         idx++;
4699                 }
4700         }
4701         err = skb->len;
4702 out_err:
4703         rcu_read_unlock();
4704         cb->args[0] = idx;
4705
4706         return err;
4707 }
4708
4709 static inline size_t bridge_nlmsg_size(void)
4710 {
4711         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4712                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
4713                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
4714                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
4715                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
4716                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
4717                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
4718                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
4719                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
4720                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
4721                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
4722 }
4723
4724 static int rtnl_bridge_notify(struct net_device *dev)
4725 {
4726         struct net *net = dev_net(dev);
4727         struct sk_buff *skb;
4728         int err = -EOPNOTSUPP;
4729
4730         if (!dev->netdev_ops->ndo_bridge_getlink)
4731                 return 0;
4732
4733         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4734         if (!skb) {
4735                 err = -ENOMEM;
4736                 goto errout;
4737         }
4738
4739         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4740         if (err < 0)
4741                 goto errout;
4742
4743         if (!skb->len)
4744                 goto errout;
4745
4746         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4747         return 0;
4748 errout:
4749         WARN_ON(err == -EMSGSIZE);
4750         kfree_skb(skb);
4751         if (err)
4752                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4753         return err;
4754 }
4755
4756 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4757                                struct netlink_ext_ack *extack)
4758 {
4759         struct net *net = sock_net(skb->sk);
4760         struct ifinfomsg *ifm;
4761         struct net_device *dev;
4762         struct nlattr *br_spec, *attr = NULL;
4763         int rem, err = -EOPNOTSUPP;
4764         u16 flags = 0;
4765         bool have_flags = false;
4766
4767         if (nlmsg_len(nlh) < sizeof(*ifm))
4768                 return -EINVAL;
4769
4770         ifm = nlmsg_data(nlh);
4771         if (ifm->ifi_family != AF_BRIDGE)
4772                 return -EPFNOSUPPORT;
4773
4774         dev = __dev_get_by_index(net, ifm->ifi_index);
4775         if (!dev) {
4776                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4777                 return -ENODEV;
4778         }
4779
4780         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4781         if (br_spec) {
4782                 nla_for_each_nested(attr, br_spec, rem) {
4783                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4784                                 if (nla_len(attr) < sizeof(flags))
4785                                         return -EINVAL;
4786
4787                                 have_flags = true;
4788                                 flags = nla_get_u16(attr);
4789                                 break;
4790                         }
4791                 }
4792         }
4793
4794         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4795                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4796
4797                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4798                         err = -EOPNOTSUPP;
4799                         goto out;
4800                 }
4801
4802                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
4803                                                              extack);
4804                 if (err)
4805                         goto out;
4806
4807                 flags &= ~BRIDGE_FLAGS_MASTER;
4808         }
4809
4810         if ((flags & BRIDGE_FLAGS_SELF)) {
4811                 if (!dev->netdev_ops->ndo_bridge_setlink)
4812                         err = -EOPNOTSUPP;
4813                 else
4814                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4815                                                                   flags,
4816                                                                   extack);
4817                 if (!err) {
4818                         flags &= ~BRIDGE_FLAGS_SELF;
4819
4820                         /* Generate event to notify upper layer of bridge
4821                          * change
4822                          */
4823                         err = rtnl_bridge_notify(dev);
4824                 }
4825         }
4826
4827         if (have_flags)
4828                 memcpy(nla_data(attr), &flags, sizeof(flags));
4829 out:
4830         return err;
4831 }
4832
4833 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4834                                struct netlink_ext_ack *extack)
4835 {
4836         struct net *net = sock_net(skb->sk);
4837         struct ifinfomsg *ifm;
4838         struct net_device *dev;
4839         struct nlattr *br_spec, *attr = NULL;
4840         int rem, err = -EOPNOTSUPP;
4841         u16 flags = 0;
4842         bool have_flags = false;
4843
4844         if (nlmsg_len(nlh) < sizeof(*ifm))
4845                 return -EINVAL;
4846
4847         ifm = nlmsg_data(nlh);
4848         if (ifm->ifi_family != AF_BRIDGE)
4849                 return -EPFNOSUPPORT;
4850
4851         dev = __dev_get_by_index(net, ifm->ifi_index);
4852         if (!dev) {
4853                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4854                 return -ENODEV;
4855         }
4856
4857         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4858         if (br_spec) {
4859                 nla_for_each_nested(attr, br_spec, rem) {
4860                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4861                                 if (nla_len(attr) < sizeof(flags))
4862                                         return -EINVAL;
4863
4864                                 have_flags = true;
4865                                 flags = nla_get_u16(attr);
4866                                 break;
4867                         }
4868                 }
4869         }
4870
4871         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4872                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4873
4874                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4875                         err = -EOPNOTSUPP;
4876                         goto out;
4877                 }
4878
4879                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4880                 if (err)
4881                         goto out;
4882
4883                 flags &= ~BRIDGE_FLAGS_MASTER;
4884         }
4885
4886         if ((flags & BRIDGE_FLAGS_SELF)) {
4887                 if (!dev->netdev_ops->ndo_bridge_dellink)
4888                         err = -EOPNOTSUPP;
4889                 else
4890                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
4891                                                                   flags);
4892
4893                 if (!err) {
4894                         flags &= ~BRIDGE_FLAGS_SELF;
4895
4896                         /* Generate event to notify upper layer of bridge
4897                          * change
4898                          */
4899                         err = rtnl_bridge_notify(dev);
4900                 }
4901         }
4902
4903         if (have_flags)
4904                 memcpy(nla_data(attr), &flags, sizeof(flags));
4905 out:
4906         return err;
4907 }
4908
4909 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
4910 {
4911         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
4912                (!idxattr || idxattr == attrid);
4913 }
4914
4915 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
4916 static int rtnl_get_offload_stats_attr_size(int attr_id)
4917 {
4918         switch (attr_id) {
4919         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
4920                 return sizeof(struct rtnl_link_stats64);
4921         }
4922
4923         return 0;
4924 }
4925
4926 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
4927                                   int *prividx)
4928 {
4929         struct nlattr *attr = NULL;
4930         int attr_id, size;
4931         void *attr_data;
4932         int err;
4933
4934         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4935               dev->netdev_ops->ndo_get_offload_stats))
4936                 return -ENODATA;
4937
4938         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4939              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4940                 if (attr_id < *prividx)
4941                         continue;
4942
4943                 size = rtnl_get_offload_stats_attr_size(attr_id);
4944                 if (!size)
4945                         continue;
4946
4947                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4948                         continue;
4949
4950                 attr = nla_reserve_64bit(skb, attr_id, size,
4951                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
4952                 if (!attr)
4953                         goto nla_put_failure;
4954
4955                 attr_data = nla_data(attr);
4956                 memset(attr_data, 0, size);
4957                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
4958                                                              attr_data);
4959                 if (err)
4960                         goto get_offload_stats_failure;
4961         }
4962
4963         if (!attr)
4964                 return -ENODATA;
4965
4966         *prividx = 0;
4967         return 0;
4968
4969 nla_put_failure:
4970         err = -EMSGSIZE;
4971 get_offload_stats_failure:
4972         *prividx = attr_id;
4973         return err;
4974 }
4975
4976 static int rtnl_get_offload_stats_size(const struct net_device *dev)
4977 {
4978         int nla_size = 0;
4979         int attr_id;
4980         int size;
4981
4982         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4983               dev->netdev_ops->ndo_get_offload_stats))
4984                 return 0;
4985
4986         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4987              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4988                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4989                         continue;
4990                 size = rtnl_get_offload_stats_attr_size(attr_id);
4991                 nla_size += nla_total_size_64bit(size);
4992         }
4993
4994         if (nla_size != 0)
4995                 nla_size += nla_total_size(0);
4996
4997         return nla_size;
4998 }
4999
5000 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
5001                                int type, u32 pid, u32 seq, u32 change,
5002                                unsigned int flags, unsigned int filter_mask,
5003                                int *idxattr, int *prividx)
5004 {
5005         struct if_stats_msg *ifsm;
5006         struct nlmsghdr *nlh;
5007         struct nlattr *attr;
5008         int s_prividx = *prividx;
5009         int err;
5010
5011         ASSERT_RTNL();
5012
5013         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
5014         if (!nlh)
5015                 return -EMSGSIZE;
5016
5017         ifsm = nlmsg_data(nlh);
5018         ifsm->family = PF_UNSPEC;
5019         ifsm->pad1 = 0;
5020         ifsm->pad2 = 0;
5021         ifsm->ifindex = dev->ifindex;
5022         ifsm->filter_mask = filter_mask;
5023
5024         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
5025                 struct rtnl_link_stats64 *sp;
5026
5027                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
5028                                          sizeof(struct rtnl_link_stats64),
5029                                          IFLA_STATS_UNSPEC);
5030                 if (!attr)
5031                         goto nla_put_failure;
5032
5033                 sp = nla_data(attr);
5034                 dev_get_stats(dev, sp);
5035         }
5036
5037         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
5038                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5039
5040                 if (ops && ops->fill_linkxstats) {
5041                         *idxattr = IFLA_STATS_LINK_XSTATS;
5042                         attr = nla_nest_start_noflag(skb,
5043                                                      IFLA_STATS_LINK_XSTATS);
5044                         if (!attr)
5045                                 goto nla_put_failure;
5046
5047                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5048                         nla_nest_end(skb, attr);
5049                         if (err)
5050                                 goto nla_put_failure;
5051                         *idxattr = 0;
5052                 }
5053         }
5054
5055         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
5056                              *idxattr)) {
5057                 const struct rtnl_link_ops *ops = NULL;
5058                 const struct net_device *master;
5059
5060                 master = netdev_master_upper_dev_get(dev);
5061                 if (master)
5062                         ops = master->rtnl_link_ops;
5063                 if (ops && ops->fill_linkxstats) {
5064                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
5065                         attr = nla_nest_start_noflag(skb,
5066                                                      IFLA_STATS_LINK_XSTATS_SLAVE);
5067                         if (!attr)
5068                                 goto nla_put_failure;
5069
5070                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5071                         nla_nest_end(skb, attr);
5072                         if (err)
5073                                 goto nla_put_failure;
5074                         *idxattr = 0;
5075                 }
5076         }
5077
5078         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
5079                              *idxattr)) {
5080                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
5081                 attr = nla_nest_start_noflag(skb,
5082                                              IFLA_STATS_LINK_OFFLOAD_XSTATS);
5083                 if (!attr)
5084                         goto nla_put_failure;
5085
5086                 err = rtnl_get_offload_stats(skb, dev, prividx);
5087                 if (err == -ENODATA)
5088                         nla_nest_cancel(skb, attr);
5089                 else
5090                         nla_nest_end(skb, attr);
5091
5092                 if (err && err != -ENODATA)
5093                         goto nla_put_failure;
5094                 *idxattr = 0;
5095         }
5096
5097         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
5098                 struct rtnl_af_ops *af_ops;
5099
5100                 *idxattr = IFLA_STATS_AF_SPEC;
5101                 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
5102                 if (!attr)
5103                         goto nla_put_failure;
5104
5105                 rcu_read_lock();
5106                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5107                         if (af_ops->fill_stats_af) {
5108                                 struct nlattr *af;
5109                                 int err;
5110
5111                                 af = nla_nest_start_noflag(skb,
5112                                                            af_ops->family);
5113                                 if (!af) {
5114                                         rcu_read_unlock();
5115                                         goto nla_put_failure;
5116                                 }
5117                                 err = af_ops->fill_stats_af(skb, dev);
5118
5119                                 if (err == -ENODATA) {
5120                                         nla_nest_cancel(skb, af);
5121                                 } else if (err < 0) {
5122                                         rcu_read_unlock();
5123                                         goto nla_put_failure;
5124                                 }
5125
5126                                 nla_nest_end(skb, af);
5127                         }
5128                 }
5129                 rcu_read_unlock();
5130
5131                 nla_nest_end(skb, attr);
5132
5133                 *idxattr = 0;
5134         }
5135
5136         nlmsg_end(skb, nlh);
5137
5138         return 0;
5139
5140 nla_put_failure:
5141         /* not a multi message or no progress mean a real error */
5142         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
5143                 nlmsg_cancel(skb, nlh);
5144         else
5145                 nlmsg_end(skb, nlh);
5146
5147         return -EMSGSIZE;
5148 }
5149
5150 static size_t if_nlmsg_stats_size(const struct net_device *dev,
5151                                   u32 filter_mask)
5152 {
5153         size_t size = 0;
5154
5155         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
5156                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
5157
5158         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
5159                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5160                 int attr = IFLA_STATS_LINK_XSTATS;
5161
5162                 if (ops && ops->get_linkxstats_size) {
5163                         size += nla_total_size(ops->get_linkxstats_size(dev,
5164                                                                         attr));
5165                         /* for IFLA_STATS_LINK_XSTATS */
5166                         size += nla_total_size(0);
5167                 }
5168         }
5169
5170         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
5171                 struct net_device *_dev = (struct net_device *)dev;
5172                 const struct rtnl_link_ops *ops = NULL;
5173                 const struct net_device *master;
5174
5175                 /* netdev_master_upper_dev_get can't take const */
5176                 master = netdev_master_upper_dev_get(_dev);
5177                 if (master)
5178                         ops = master->rtnl_link_ops;
5179                 if (ops && ops->get_linkxstats_size) {
5180                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
5181
5182                         size += nla_total_size(ops->get_linkxstats_size(dev,
5183                                                                         attr));
5184                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
5185                         size += nla_total_size(0);
5186                 }
5187         }
5188
5189         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
5190                 size += rtnl_get_offload_stats_size(dev);
5191
5192         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
5193                 struct rtnl_af_ops *af_ops;
5194
5195                 /* for IFLA_STATS_AF_SPEC */
5196                 size += nla_total_size(0);
5197
5198                 rcu_read_lock();
5199                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5200                         if (af_ops->get_stats_af_size) {
5201                                 size += nla_total_size(
5202                                         af_ops->get_stats_af_size(dev));
5203
5204                                 /* for AF_* */
5205                                 size += nla_total_size(0);
5206                         }
5207                 }
5208                 rcu_read_unlock();
5209         }
5210
5211         return size;
5212 }
5213
5214 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
5215                                 bool is_dump, struct netlink_ext_ack *extack)
5216 {
5217         struct if_stats_msg *ifsm;
5218
5219         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
5220                 NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
5221                 return -EINVAL;
5222         }
5223
5224         if (!strict_check)
5225                 return 0;
5226
5227         ifsm = nlmsg_data(nlh);
5228
5229         /* only requests using strict checks can pass data to influence
5230          * the dump. The legacy exception is filter_mask.
5231          */
5232         if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
5233                 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
5234                 return -EINVAL;
5235         }
5236         if (nlmsg_attrlen(nlh, sizeof(*ifsm))) {
5237                 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
5238                 return -EINVAL;
5239         }
5240         if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5241                 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5242                 return -EINVAL;
5243         }
5244
5245         return 0;
5246 }
5247
5248 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5249                           struct netlink_ext_ack *extack)
5250 {
5251         struct net *net = sock_net(skb->sk);
5252         struct net_device *dev = NULL;
5253         int idxattr = 0, prividx = 0;
5254         struct if_stats_msg *ifsm;
5255         struct sk_buff *nskb;
5256         u32 filter_mask;
5257         int err;
5258
5259         err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5260                                    false, extack);
5261         if (err)
5262                 return err;
5263
5264         ifsm = nlmsg_data(nlh);
5265         if (ifsm->ifindex > 0)
5266                 dev = __dev_get_by_index(net, ifsm->ifindex);
5267         else
5268                 return -EINVAL;
5269
5270         if (!dev)
5271                 return -ENODEV;
5272
5273         filter_mask = ifsm->filter_mask;
5274         if (!filter_mask)
5275                 return -EINVAL;
5276
5277         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
5278         if (!nskb)
5279                 return -ENOBUFS;
5280
5281         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5282                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5283                                   0, filter_mask, &idxattr, &prividx);
5284         if (err < 0) {
5285                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5286                 WARN_ON(err == -EMSGSIZE);
5287                 kfree_skb(nskb);
5288         } else {
5289                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5290         }
5291
5292         return err;
5293 }
5294
5295 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5296 {
5297         struct netlink_ext_ack *extack = cb->extack;
5298         int h, s_h, err, s_idx, s_idxattr, s_prividx;
5299         struct net *net = sock_net(skb->sk);
5300         unsigned int flags = NLM_F_MULTI;
5301         struct if_stats_msg *ifsm;
5302         struct hlist_head *head;
5303         struct net_device *dev;
5304         u32 filter_mask = 0;
5305         int idx = 0;
5306
5307         s_h = cb->args[0];
5308         s_idx = cb->args[1];
5309         s_idxattr = cb->args[2];
5310         s_prividx = cb->args[3];
5311
5312         cb->seq = net->dev_base_seq;
5313
5314         err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5315         if (err)
5316                 return err;
5317
5318         ifsm = nlmsg_data(cb->nlh);
5319         filter_mask = ifsm->filter_mask;
5320         if (!filter_mask) {
5321                 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5322                 return -EINVAL;
5323         }
5324
5325         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5326                 idx = 0;
5327                 head = &net->dev_index_head[h];
5328                 hlist_for_each_entry(dev, head, index_hlist) {
5329                         if (idx < s_idx)
5330                                 goto cont;
5331                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5332                                                   NETLINK_CB(cb->skb).portid,
5333                                                   cb->nlh->nlmsg_seq, 0,
5334                                                   flags, filter_mask,
5335                                                   &s_idxattr, &s_prividx);
5336                         /* If we ran out of room on the first message,
5337                          * we're in trouble
5338                          */
5339                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5340
5341                         if (err < 0)
5342                                 goto out;
5343                         s_prividx = 0;
5344                         s_idxattr = 0;
5345                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5346 cont:
5347                         idx++;
5348                 }
5349         }
5350 out:
5351         cb->args[3] = s_prividx;
5352         cb->args[2] = s_idxattr;
5353         cb->args[1] = idx;
5354         cb->args[0] = h;
5355
5356         return skb->len;
5357 }
5358
5359 /* Process one rtnetlink message. */
5360
5361 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5362                              struct netlink_ext_ack *extack)
5363 {
5364         struct net *net = sock_net(skb->sk);
5365         struct rtnl_link *link;
5366         struct module *owner;
5367         int err = -EOPNOTSUPP;
5368         rtnl_doit_func doit;
5369         unsigned int flags;
5370         int kind;
5371         int family;
5372         int type;
5373
5374         type = nlh->nlmsg_type;
5375         if (type > RTM_MAX)
5376                 return -EOPNOTSUPP;
5377
5378         type -= RTM_BASE;
5379
5380         /* All the messages must have at least 1 byte length */
5381         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
5382                 return 0;
5383
5384         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
5385         kind = type&3;
5386
5387         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
5388                 return -EPERM;
5389
5390         rcu_read_lock();
5391         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
5392                 struct sock *rtnl;
5393                 rtnl_dumpit_func dumpit;
5394                 u16 min_dump_alloc = 0;
5395
5396                 link = rtnl_get_link(family, type);
5397                 if (!link || !link->dumpit) {
5398                         family = PF_UNSPEC;
5399                         link = rtnl_get_link(family, type);
5400                         if (!link || !link->dumpit)
5401                                 goto err_unlock;
5402                 }
5403                 owner = link->owner;
5404                 dumpit = link->dumpit;
5405
5406                 if (type == RTM_GETLINK - RTM_BASE)
5407                         min_dump_alloc = rtnl_calcit(skb, nlh);
5408
5409                 err = 0;
5410                 /* need to do this before rcu_read_unlock() */
5411                 if (!try_module_get(owner))
5412                         err = -EPROTONOSUPPORT;
5413
5414                 rcu_read_unlock();
5415
5416                 rtnl = net->rtnl;
5417                 if (err == 0) {
5418                         struct netlink_dump_control c = {
5419                                 .dump           = dumpit,
5420                                 .min_dump_alloc = min_dump_alloc,
5421                                 .module         = owner,
5422                         };
5423                         err = netlink_dump_start(rtnl, skb, nlh, &c);
5424                         /* netlink_dump_start() will keep a reference on
5425                          * module if dump is still in progress.
5426                          */
5427                         module_put(owner);
5428                 }
5429                 return err;
5430         }
5431
5432         link = rtnl_get_link(family, type);
5433         if (!link || !link->doit) {
5434                 family = PF_UNSPEC;
5435                 link = rtnl_get_link(PF_UNSPEC, type);
5436                 if (!link || !link->doit)
5437                         goto out_unlock;
5438         }
5439
5440         owner = link->owner;
5441         if (!try_module_get(owner)) {
5442                 err = -EPROTONOSUPPORT;
5443                 goto out_unlock;
5444         }
5445
5446         flags = link->flags;
5447         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
5448                 doit = link->doit;
5449                 rcu_read_unlock();
5450                 if (doit)
5451                         err = doit(skb, nlh, extack);
5452                 module_put(owner);
5453                 return err;
5454         }
5455         rcu_read_unlock();
5456
5457         rtnl_lock();
5458         link = rtnl_get_link(family, type);
5459         if (link && link->doit)
5460                 err = link->doit(skb, nlh, extack);
5461         rtnl_unlock();
5462
5463         module_put(owner);
5464
5465         return err;
5466
5467 out_unlock:
5468         rcu_read_unlock();
5469         return err;
5470
5471 err_unlock:
5472         rcu_read_unlock();
5473         return -EOPNOTSUPP;
5474 }
5475
5476 static void rtnetlink_rcv(struct sk_buff *skb)
5477 {
5478         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
5479 }
5480
5481 static int rtnetlink_bind(struct net *net, int group)
5482 {
5483         switch (group) {
5484         case RTNLGRP_IPV4_MROUTE_R:
5485         case RTNLGRP_IPV6_MROUTE_R:
5486                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5487                         return -EPERM;
5488                 break;
5489         }
5490         return 0;
5491 }
5492
5493 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
5494 {
5495         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5496
5497         switch (event) {
5498         case NETDEV_REBOOT:
5499         case NETDEV_CHANGEMTU:
5500         case NETDEV_CHANGEADDR:
5501         case NETDEV_CHANGENAME:
5502         case NETDEV_FEAT_CHANGE:
5503         case NETDEV_BONDING_FAILOVER:
5504         case NETDEV_POST_TYPE_CHANGE:
5505         case NETDEV_NOTIFY_PEERS:
5506         case NETDEV_CHANGEUPPER:
5507         case NETDEV_RESEND_IGMP:
5508         case NETDEV_CHANGEINFODATA:
5509         case NETDEV_CHANGELOWERSTATE:
5510         case NETDEV_CHANGE_TX_QUEUE_LEN:
5511                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
5512                                    GFP_KERNEL, NULL, 0);
5513                 break;
5514         default:
5515                 break;
5516         }
5517         return NOTIFY_DONE;
5518 }
5519
5520 static struct notifier_block rtnetlink_dev_notifier = {
5521         .notifier_call  = rtnetlink_event,
5522 };
5523
5524
5525 static int __net_init rtnetlink_net_init(struct net *net)
5526 {
5527         struct sock *sk;
5528         struct netlink_kernel_cfg cfg = {
5529                 .groups         = RTNLGRP_MAX,
5530                 .input          = rtnetlink_rcv,
5531                 .cb_mutex       = &rtnl_mutex,
5532                 .flags          = NL_CFG_F_NONROOT_RECV,
5533                 .bind           = rtnetlink_bind,
5534         };
5535
5536         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
5537         if (!sk)
5538                 return -ENOMEM;
5539         net->rtnl = sk;
5540         return 0;
5541 }
5542
5543 static void __net_exit rtnetlink_net_exit(struct net *net)
5544 {
5545         netlink_kernel_release(net->rtnl);
5546         net->rtnl = NULL;
5547 }
5548
5549 static struct pernet_operations rtnetlink_net_ops = {
5550         .init = rtnetlink_net_init,
5551         .exit = rtnetlink_net_exit,
5552 };
5553
5554 void __init rtnetlink_init(void)
5555 {
5556         if (register_pernet_subsys(&rtnetlink_net_ops))
5557                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
5558
5559         register_netdevice_notifier(&rtnetlink_dev_notifier);
5560
5561         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
5562                       rtnl_dump_ifinfo, 0);
5563         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
5564         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
5565         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
5566
5567         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
5568         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
5569         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
5570
5571         rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
5572         rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
5573
5574         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
5575         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
5576         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
5577
5578         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
5579         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
5580         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
5581
5582         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
5583                       0);
5584 }