net/core/rtnetlink.c

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