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_INIT_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_INIT_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
 714         return nlmsg_notify(rtnl, skb, pid, group, echo, GFP_KERNEL);
 715 }
 716
 717 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 718 {
 719         struct sock *rtnl = net->rtnl;
 720
 721         return nlmsg_unicast(rtnl, skb, pid);
 722 }
 723 EXPORT_SYMBOL(rtnl_unicast);
 724
 725 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 726                  struct nlmsghdr *nlh, gfp_t flags)
 727 {
 728         struct sock *rtnl = net->rtnl;
 729
 730         nlmsg_notify(rtnl, skb, pid, group, nlmsg_report(nlh), flags);
 731 }
 732 EXPORT_SYMBOL(rtnl_notify);
 733
 734 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 735 {
 736         struct sock *rtnl = net->rtnl;
 737
 738         netlink_set_err(rtnl, 0, group, error);
 739 }
 740 EXPORT_SYMBOL(rtnl_set_sk_err);
 741
 742 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 743 {
 744         struct nlattr *mx;
 745         int i, valid = 0;
 746
 747         /* nothing is dumped for dst_default_metrics, so just skip the loop */
 748         if (metrics == dst_default_metrics.metrics)
 749                 return 0;
 750
 751         mx = nla_nest_start_noflag(skb, RTA_METRICS);
 752         if (mx == NULL)
 753                 return -ENOBUFS;
 754
 755         for (i = 0; i < RTAX_MAX; i++) {
 756                 if (metrics[i]) {
 757                         if (i == RTAX_CC_ALGO - 1) {
 758                                 char tmp[TCP_CA_NAME_MAX], *name;
 759
 760                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 761                                 if (!name)
 762                                         continue;
 763                                 if (nla_put_string(skb, i + 1, name))
 764                                         goto nla_put_failure;
 765                         } else if (i == RTAX_FEATURES - 1) {
 766                                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 767
 768                                 if (!user_features)
 769                                         continue;
 770                                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 771                                 if (nla_put_u32(skb, i + 1, user_features))
 772                                         goto nla_put_failure;
 773                         } else {
 774                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 775                                         goto nla_put_failure;
 776                         }
 777                         valid++;
 778                 }
 779         }
 780
 781         if (!valid) {
 782                 nla_nest_cancel(skb, mx);
 783                 return 0;
 784         }
 785
 786         return nla_nest_end(skb, mx);
 787
 788 nla_put_failure:
 789         nla_nest_cancel(skb, mx);
 790         return -EMSGSIZE;
 791 }
 792 EXPORT_SYMBOL(rtnetlink_put_metrics);
 793
 794 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 795                        long expires, u32 error)
 796 {
 797         struct rta_cacheinfo ci = {
 798                 .rta_error = error,
 799                 .rta_id =  id,
 800         };
 801
 802         if (dst) {
 803                 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
 804                 ci.rta_used = dst->__use;
 805                 ci.rta_clntref = atomic_read(&dst->__refcnt);
 806         }
 807         if (expires) {
 808                 unsigned long clock;
 809
 810                 clock = jiffies_to_clock_t(abs(expires));
 811                 clock = min_t(unsigned long, clock, INT_MAX);
 812                 ci.rta_expires = (expires > 0) ? clock : -clock;
 813         }
 814         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 815 }
 816 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 817
 818 static void set_operstate(struct net_device *dev, unsigned char transition)
 819 {
 820         unsigned char operstate = dev->operstate;
 821
 822         switch (transition) {
 823         case IF_OPER_UP:
 824                 if ((operstate == IF_OPER_DORMANT ||
 825                      operstate == IF_OPER_TESTING ||
 826                      operstate == IF_OPER_UNKNOWN) &&
 827                     !netif_dormant(dev) && !netif_testing(dev))
 828                         operstate = IF_OPER_UP;
 829                 break;
 830
 831         case IF_OPER_TESTING:
 832                 if (operstate == IF_OPER_UP ||
 833                     operstate == IF_OPER_UNKNOWN)
 834                         operstate = IF_OPER_TESTING;
 835                 break;
 836
 837         case IF_OPER_DORMANT:
 838                 if (operstate == IF_OPER_UP ||
 839                     operstate == IF_OPER_UNKNOWN)
 840                         operstate = IF_OPER_DORMANT;
 841                 break;
 842         }
 843
 844         if (dev->operstate != operstate) {
 845                 write_lock(&dev_base_lock);
 846                 dev->operstate = operstate;
 847                 write_unlock(&dev_base_lock);
 848                 netdev_state_change(dev);
 849         }
 850 }
 851
 852 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 853 {
 854         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 855                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 856 }
 857
 858 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 859                                            const struct ifinfomsg *ifm)
 860 {
 861         unsigned int flags = ifm->ifi_flags;
 862
 863         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 864         if (ifm->ifi_change)
 865                 flags = (flags & ifm->ifi_change) |
 866                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 867
 868         return flags;
 869 }
 870
 871 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 872                                  const struct rtnl_link_stats64 *b)
 873 {
 874         a->rx_packets = b->rx_packets;
 875         a->tx_packets = b->tx_packets;
 876         a->rx_bytes = b->rx_bytes;
 877         a->tx_bytes = b->tx_bytes;
 878         a->rx_errors = b->rx_errors;
 879         a->tx_errors = b->tx_errors;
 880         a->rx_dropped = b->rx_dropped;
 881         a->tx_dropped = b->tx_dropped;
 882
 883         a->multicast = b->multicast;
 884         a->collisions = b->collisions;
 885
 886         a->rx_length_errors = b->rx_length_errors;
 887         a->rx_over_errors = b->rx_over_errors;
 888         a->rx_crc_errors = b->rx_crc_errors;
 889         a->rx_frame_errors = b->rx_frame_errors;
 890         a->rx_fifo_errors = b->rx_fifo_errors;
 891         a->rx_missed_errors = b->rx_missed_errors;
 892
 893         a->tx_aborted_errors = b->tx_aborted_errors;
 894         a->tx_carrier_errors = b->tx_carrier_errors;
 895         a->tx_fifo_errors = b->tx_fifo_errors;
 896         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 897         a->tx_window_errors = b->tx_window_errors;
 898
 899         a->rx_compressed = b->rx_compressed;
 900         a->tx_compressed = b->tx_compressed;
 901
 902         a->rx_nohandler = b->rx_nohandler;
 903 }
 904
 905 /* All VF info */
 906 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 907                                    u32 ext_filter_mask)
 908 {
 909         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
 910                 int num_vfs = dev_num_vf(dev->dev.parent);
 911                 size_t size = nla_total_size(0);
 912                 size += num_vfs *
 913                         (nla_total_size(0) +
 914                          nla_total_size(sizeof(struct ifla_vf_mac)) +
 915                          nla_total_size(sizeof(struct ifla_vf_broadcast)) +
 916                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 917                          nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
 918                          nla_total_size(MAX_VLAN_LIST_LEN *
 919                                         sizeof(struct ifla_vf_vlan_info)) +
 920                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 921                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 922                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 923                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 924                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 925                          nla_total_size(0) + /* nest IFLA_VF_STATS */
 926                          /* IFLA_VF_STATS_RX_PACKETS */
 927                          nla_total_size_64bit(sizeof(__u64)) +
 928                          /* IFLA_VF_STATS_TX_PACKETS */
 929                          nla_total_size_64bit(sizeof(__u64)) +
 930                          /* IFLA_VF_STATS_RX_BYTES */
 931                          nla_total_size_64bit(sizeof(__u64)) +
 932                          /* IFLA_VF_STATS_TX_BYTES */
 933                          nla_total_size_64bit(sizeof(__u64)) +
 934                          /* IFLA_VF_STATS_BROADCAST */
 935                          nla_total_size_64bit(sizeof(__u64)) +
 936                          /* IFLA_VF_STATS_MULTICAST */
 937                          nla_total_size_64bit(sizeof(__u64)) +
 938                          /* IFLA_VF_STATS_RX_DROPPED */
 939                          nla_total_size_64bit(sizeof(__u64)) +
 940                          /* IFLA_VF_STATS_TX_DROPPED */
 941                          nla_total_size_64bit(sizeof(__u64)) +
 942                          nla_total_size(sizeof(struct ifla_vf_trust)));
 943                 return size;
 944         } else
 945                 return 0;
 946 }
 947
 948 static size_t rtnl_port_size(const struct net_device *dev,
 949                              u32 ext_filter_mask)
 950 {
 951         size_t port_size = nla_total_size(4)            /* PORT_VF */
 952                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 953                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 954                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 955                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 956                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 957         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 958         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 959                 + port_size;
 960         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 961                 + port_size;
 962
 963         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 964             !(ext_filter_mask & RTEXT_FILTER_VF))
 965                 return 0;
 966         if (dev_num_vf(dev->dev.parent))
 967                 return port_self_size + vf_ports_size +
 968                         vf_port_size * dev_num_vf(dev->dev.parent);
 969         else
 970                 return port_self_size;
 971 }
 972
 973 static size_t rtnl_xdp_size(void)
 974 {
 975         size_t xdp_size = nla_total_size(0) +   /* nest IFLA_XDP */
 976                           nla_total_size(1) +   /* XDP_ATTACHED */
 977                           nla_total_size(4) +   /* XDP_PROG_ID (or 1st mode) */
 978                           nla_total_size(4);    /* XDP_<mode>_PROG_ID */
 979
 980         return xdp_size;
 981 }
 982
 983 static size_t rtnl_prop_list_size(const struct net_device *dev)
 984 {
 985         struct netdev_name_node *name_node;
 986         size_t size;
 987
 988         if (list_empty(&dev->name_node->list))
 989                 return 0;
 990         size = nla_total_size(0);
 991         list_for_each_entry(name_node, &dev->name_node->list, list)
 992                 size += nla_total_size(ALTIFNAMSIZ);
 993         return size;
 994 }
 995
 996 static size_t rtnl_proto_down_size(const struct net_device *dev)
 997 {
 998         size_t size = nla_total_size(1);
 999
1000         if (dev->proto_down_reason)
1001                 size += nla_total_size(0) + nla_total_size(4);
1002
1003         return size;
1004 }
1005
1006 static noinline size_t if_nlmsg_size(const struct net_device *dev,
1007                                      u32 ext_filter_mask)
1008 {
1009         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
1010                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
1011                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
1012                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
1013                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
1014                + nla_total_size(sizeof(struct rtnl_link_stats))
1015                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
1016                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
1017                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
1018                + nla_total_size(4) /* IFLA_TXQLEN */
1019                + nla_total_size(4) /* IFLA_WEIGHT */
1020                + nla_total_size(4) /* IFLA_MTU */
1021                + nla_total_size(4) /* IFLA_LINK */
1022                + nla_total_size(4) /* IFLA_MASTER */
1023                + nla_total_size(1) /* IFLA_CARRIER */
1024                + nla_total_size(4) /* IFLA_PROMISCUITY */
1025                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1026                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1027                + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1028                + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1029                + nla_total_size(4) /* IFLA_GRO_MAX_SIZE */
1030                + nla_total_size(1) /* IFLA_OPERSTATE */
1031                + nla_total_size(1) /* IFLA_LINKMODE */
1032                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1033                + nla_total_size(4) /* IFLA_LINK_NETNSID */
1034                + nla_total_size(4) /* IFLA_GROUP */
1035                + nla_total_size(ext_filter_mask
1036                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1037                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1038                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1039                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1040                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1041                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1042                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1043                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1044                + rtnl_xdp_size() /* IFLA_XDP */
1045                + nla_total_size(4)  /* IFLA_EVENT */
1046                + nla_total_size(4)  /* IFLA_NEW_NETNSID */
1047                + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
1048                + rtnl_proto_down_size(dev)  /* proto down */
1049                + nla_total_size(4)  /* IFLA_TARGET_NETNSID */
1050                + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
1051                + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
1052                + nla_total_size(4)  /* IFLA_MIN_MTU */
1053                + nla_total_size(4)  /* IFLA_MAX_MTU */
1054                + rtnl_prop_list_size(dev)
1055                + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
1056                + 0;
1057 }
1058
1059 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1060 {
1061         struct nlattr *vf_ports;
1062         struct nlattr *vf_port;
1063         int vf;
1064         int err;
1065
1066         vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
1067         if (!vf_ports)
1068                 return -EMSGSIZE;
1069
1070         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1071                 vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
1072                 if (!vf_port)
1073                         goto nla_put_failure;
1074                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1075                         goto nla_put_failure;
1076                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1077                 if (err == -EMSGSIZE)
1078                         goto nla_put_failure;
1079                 if (err) {
1080                         nla_nest_cancel(skb, vf_port);
1081                         continue;
1082                 }
1083                 nla_nest_end(skb, vf_port);
1084         }
1085
1086         nla_nest_end(skb, vf_ports);
1087
1088         return 0;
1089
1090 nla_put_failure:
1091         nla_nest_cancel(skb, vf_ports);
1092         return -EMSGSIZE;
1093 }
1094
1095 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1096 {
1097         struct nlattr *port_self;
1098         int err;
1099
1100         port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
1101         if (!port_self)
1102                 return -EMSGSIZE;
1103
1104         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1105         if (err) {
1106                 nla_nest_cancel(skb, port_self);
1107                 return (err == -EMSGSIZE) ? err : 0;
1108         }
1109
1110         nla_nest_end(skb, port_self);
1111
1112         return 0;
1113 }
1114
1115 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1116                           u32 ext_filter_mask)
1117 {
1118         int err;
1119
1120         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1121             !(ext_filter_mask & RTEXT_FILTER_VF))
1122                 return 0;
1123
1124         err = rtnl_port_self_fill(skb, dev);
1125         if (err)
1126                 return err;
1127
1128         if (dev_num_vf(dev->dev.parent)) {
1129                 err = rtnl_vf_ports_fill(skb, dev);
1130                 if (err)
1131                         return err;
1132         }
1133
1134         return 0;
1135 }
1136
1137 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1138 {
1139         int err;
1140         struct netdev_phys_item_id ppid;
1141
1142         err = dev_get_phys_port_id(dev, &ppid);
1143         if (err) {
1144                 if (err == -EOPNOTSUPP)
1145                         return 0;
1146                 return err;
1147         }
1148
1149         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1150                 return -EMSGSIZE;
1151
1152         return 0;
1153 }
1154
1155 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1156 {
1157         char name[IFNAMSIZ];
1158         int err;
1159
1160         err = dev_get_phys_port_name(dev, name, sizeof(name));
1161         if (err) {
1162                 if (err == -EOPNOTSUPP)
1163                         return 0;
1164                 return err;
1165         }
1166
1167         if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1168                 return -EMSGSIZE;
1169
1170         return 0;
1171 }
1172
1173 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1174 {
1175         struct netdev_phys_item_id ppid = { };
1176         int err;
1177
1178         err = dev_get_port_parent_id(dev, &ppid, false);
1179         if (err) {
1180                 if (err == -EOPNOTSUPP)
1181                         return 0;
1182                 return err;
1183         }
1184
1185         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
1186                 return -EMSGSIZE;
1187
1188         return 0;
1189 }
1190
1191 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1192                                               struct net_device *dev)
1193 {
1194         struct rtnl_link_stats64 *sp;
1195         struct nlattr *attr;
1196
1197         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1198                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1199         if (!attr)
1200                 return -EMSGSIZE;
1201
1202         sp = nla_data(attr);
1203         dev_get_stats(dev, sp);
1204
1205         attr = nla_reserve(skb, IFLA_STATS,
1206                            sizeof(struct rtnl_link_stats));
1207         if (!attr)
1208                 return -EMSGSIZE;
1209
1210         copy_rtnl_link_stats(nla_data(attr), sp);
1211
1212         return 0;
1213 }
1214
1215 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1216                                                struct net_device *dev,
1217                                                int vfs_num,
1218                                                struct nlattr *vfinfo)
1219 {
1220         struct ifla_vf_rss_query_en vf_rss_query_en;
1221         struct nlattr *vf, *vfstats, *vfvlanlist;
1222         struct ifla_vf_link_state vf_linkstate;
1223         struct ifla_vf_vlan_info vf_vlan_info;
1224         struct ifla_vf_spoofchk vf_spoofchk;
1225         struct ifla_vf_tx_rate vf_tx_rate;
1226         struct ifla_vf_stats vf_stats;
1227         struct ifla_vf_trust vf_trust;
1228         struct ifla_vf_vlan vf_vlan;
1229         struct ifla_vf_rate vf_rate;
1230         struct ifla_vf_mac vf_mac;
1231         struct ifla_vf_broadcast vf_broadcast;
1232         struct ifla_vf_info ivi;
1233         struct ifla_vf_guid node_guid;
1234         struct ifla_vf_guid port_guid;
1235
1236         memset(&ivi, 0, sizeof(ivi));
1237
1238         /* Not all SR-IOV capable drivers support the
1239          * spoofcheck and "RSS query enable" query.  Preset to
1240          * -1 so the user space tool can detect that the driver
1241          * didn't report anything.
1242          */
1243         ivi.spoofchk = -1;
1244         ivi.rss_query_en = -1;
1245         ivi.trusted = -1;
1246         /* The default value for VF link state is "auto"
1247          * IFLA_VF_LINK_STATE_AUTO which equals zero
1248          */
1249         ivi.linkstate = 0;
1250         /* VLAN Protocol by default is 802.1Q */
1251         ivi.vlan_proto = htons(ETH_P_8021Q);
1252         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1253                 return 0;
1254
1255         memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1256         memset(&node_guid, 0, sizeof(node_guid));
1257         memset(&port_guid, 0, sizeof(port_guid));
1258
1259         vf_mac.vf =
1260                 vf_vlan.vf =
1261                 vf_vlan_info.vf =
1262                 vf_rate.vf =
1263                 vf_tx_rate.vf =
1264                 vf_spoofchk.vf =
1265                 vf_linkstate.vf =
1266                 vf_rss_query_en.vf =
1267                 vf_trust.vf =
1268                 node_guid.vf =
1269                 port_guid.vf = ivi.vf;
1270
1271         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1272         memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
1273         vf_vlan.vlan = ivi.vlan;
1274         vf_vlan.qos = ivi.qos;
1275         vf_vlan_info.vlan = ivi.vlan;
1276         vf_vlan_info.qos = ivi.qos;
1277         vf_vlan_info.vlan_proto = ivi.vlan_proto;
1278         vf_tx_rate.rate = ivi.max_tx_rate;
1279         vf_rate.min_tx_rate = ivi.min_tx_rate;
1280         vf_rate.max_tx_rate = ivi.max_tx_rate;
1281         vf_spoofchk.setting = ivi.spoofchk;
1282         vf_linkstate.link_state = ivi.linkstate;
1283         vf_rss_query_en.setting = ivi.rss_query_en;
1284         vf_trust.setting = ivi.trusted;
1285         vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1286         if (!vf)
1287                 goto nla_put_vfinfo_failure;
1288         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1289             nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
1290             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1291             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1292                     &vf_rate) ||
1293             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1294                     &vf_tx_rate) ||
1295             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1296                     &vf_spoofchk) ||
1297             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1298                     &vf_linkstate) ||
1299             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1300                     sizeof(vf_rss_query_en),
1301                     &vf_rss_query_en) ||
1302             nla_put(skb, IFLA_VF_TRUST,
1303                     sizeof(vf_trust), &vf_trust))
1304                 goto nla_put_vf_failure;
1305
1306         if (dev->netdev_ops->ndo_get_vf_guid &&
1307             !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
1308                                               &port_guid)) {
1309                 if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
1310                             &node_guid) ||
1311                     nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
1312                             &port_guid))
1313                         goto nla_put_vf_failure;
1314         }
1315         vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1316         if (!vfvlanlist)
1317                 goto nla_put_vf_failure;
1318         if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1319                     &vf_vlan_info)) {
1320                 nla_nest_cancel(skb, vfvlanlist);
1321                 goto nla_put_vf_failure;
1322         }
1323         nla_nest_end(skb, vfvlanlist);
1324         memset(&vf_stats, 0, sizeof(vf_stats));
1325         if (dev->netdev_ops->ndo_get_vf_stats)
1326                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1327                                                 &vf_stats);
1328         vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1329         if (!vfstats)
1330                 goto nla_put_vf_failure;
1331         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1332                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1333             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1334                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1335             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1336                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1337             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1338                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1339             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1340                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1341             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1342                               vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1343             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1344                               vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1345             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1346                               vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1347                 nla_nest_cancel(skb, vfstats);
1348                 goto nla_put_vf_failure;
1349         }
1350         nla_nest_end(skb, vfstats);
1351         nla_nest_end(skb, vf);
1352         return 0;
1353
1354 nla_put_vf_failure:
1355         nla_nest_cancel(skb, vf);
1356 nla_put_vfinfo_failure:
1357         nla_nest_cancel(skb, vfinfo);
1358         return -EMSGSIZE;
1359 }
1360
1361 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1362                                            struct net_device *dev,
1363                                            u32 ext_filter_mask)
1364 {
1365         struct nlattr *vfinfo;
1366         int i, num_vfs;
1367
1368         if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1369                 return 0;
1370
1371         num_vfs = dev_num_vf(dev->dev.parent);
1372         if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1373                 return -EMSGSIZE;
1374
1375         if (!dev->netdev_ops->ndo_get_vf_config)
1376                 return 0;
1377
1378         vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1379         if (!vfinfo)
1380                 return -EMSGSIZE;
1381
1382         for (i = 0; i < num_vfs; i++) {
1383                 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1384                         return -EMSGSIZE;
1385         }
1386
1387         nla_nest_end(skb, vfinfo);
1388         return 0;
1389 }
1390
1391 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1392 {
1393         struct rtnl_link_ifmap map;
1394
1395         memset(&map, 0, sizeof(map));
1396         map.mem_start   = dev->mem_start;
1397         map.mem_end     = dev->mem_end;
1398         map.base_addr   = dev->base_addr;
1399         map.irq         = dev->irq;
1400         map.dma         = dev->dma;
1401         map.port        = dev->if_port;
1402
1403         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1404                 return -EMSGSIZE;
1405
1406         return 0;
1407 }
1408
1409 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1410 {
1411         const struct bpf_prog *generic_xdp_prog;
1412
1413         ASSERT_RTNL();
1414
1415         generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1416         if (!generic_xdp_prog)
1417                 return 0;
1418         return generic_xdp_prog->aux->id;
1419 }
1420
1421 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1422 {
1423         return dev_xdp_prog_id(dev, XDP_MODE_DRV);
1424 }
1425
1426 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1427 {
1428         return dev_xdp_prog_id(dev, XDP_MODE_HW);
1429 }
1430
1431 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1432                                u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1433                                u32 (*get_prog_id)(struct net_device *dev))
1434 {
1435         u32 curr_id;
1436         int err;
1437
1438         curr_id = get_prog_id(dev);
1439         if (!curr_id)
1440                 return 0;
1441
1442         *prog_id = curr_id;
1443         err = nla_put_u32(skb, attr, curr_id);
1444         if (err)
1445                 return err;
1446
1447         if (*mode != XDP_ATTACHED_NONE)
1448                 *mode = XDP_ATTACHED_MULTI;
1449         else
1450                 *mode = tgt_mode;
1451
1452         return 0;
1453 }
1454
1455 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1456 {
1457         struct nlattr *xdp;
1458         u32 prog_id;
1459         int err;
1460         u8 mode;
1461
1462         xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1463         if (!xdp)
1464                 return -EMSGSIZE;
1465
1466         prog_id = 0;
1467         mode = XDP_ATTACHED_NONE;
1468         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1469                                   IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1470         if (err)
1471                 goto err_cancel;
1472         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1473                                   IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1474         if (err)
1475                 goto err_cancel;
1476         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1477                                   IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1478         if (err)
1479                 goto err_cancel;
1480
1481         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1482         if (err)
1483                 goto err_cancel;
1484
1485         if (prog_id && mode != XDP_ATTACHED_MULTI) {
1486                 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1487                 if (err)
1488                         goto err_cancel;
1489         }
1490
1491         nla_nest_end(skb, xdp);
1492         return 0;
1493
1494 err_cancel:
1495         nla_nest_cancel(skb, xdp);
1496         return err;
1497 }
1498
1499 static u32 rtnl_get_event(unsigned long event)
1500 {
1501         u32 rtnl_event_type = IFLA_EVENT_NONE;
1502
1503         switch (event) {
1504         case NETDEV_REBOOT:
1505                 rtnl_event_type = IFLA_EVENT_REBOOT;
1506                 break;
1507         case NETDEV_FEAT_CHANGE:
1508                 rtnl_event_type = IFLA_EVENT_FEATURES;
1509                 break;
1510         case NETDEV_BONDING_FAILOVER:
1511                 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1512                 break;
1513         case NETDEV_NOTIFY_PEERS:
1514                 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1515                 break;
1516         case NETDEV_RESEND_IGMP:
1517                 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1518                 break;
1519         case NETDEV_CHANGEINFODATA:
1520                 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1521                 break;
1522         default:
1523                 break;
1524         }
1525
1526         return rtnl_event_type;
1527 }
1528
1529 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1530 {
1531         const struct net_device *upper_dev;
1532         int ret = 0;
1533
1534         rcu_read_lock();
1535
1536         upper_dev = netdev_master_upper_dev_get_rcu(dev);
1537         if (upper_dev)
1538                 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1539
1540         rcu_read_unlock();
1541         return ret;
1542 }
1543
1544 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1545                           bool force)
1546 {
1547         int ifindex = dev_get_iflink(dev);
1548
1549         if (force || dev->ifindex != ifindex)
1550                 return nla_put_u32(skb, IFLA_LINK, ifindex);
1551
1552         return 0;
1553 }
1554
1555 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1556                                               struct net_device *dev)
1557 {
1558         char buf[IFALIASZ];
1559         int ret;
1560
1561         ret = dev_get_alias(dev, buf, sizeof(buf));
1562         return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1563 }
1564
1565 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1566                                   const struct net_device *dev,
1567                                   struct net *src_net, gfp_t gfp)
1568 {
1569         bool put_iflink = false;
1570
1571         if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1572                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1573
1574                 if (!net_eq(dev_net(dev), link_net)) {
1575                         int id = peernet2id_alloc(src_net, link_net, gfp);
1576
1577                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1578                                 return -EMSGSIZE;
1579
1580                         put_iflink = true;
1581                 }
1582         }
1583
1584         return nla_put_iflink(skb, dev, put_iflink);
1585 }
1586
1587 static int rtnl_fill_link_af(struct sk_buff *skb,
1588                              const struct net_device *dev,
1589                              u32 ext_filter_mask)
1590 {
1591         const struct rtnl_af_ops *af_ops;
1592         struct nlattr *af_spec;
1593
1594         af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1595         if (!af_spec)
1596                 return -EMSGSIZE;
1597
1598         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1599                 struct nlattr *af;
1600                 int err;
1601
1602                 if (!af_ops->fill_link_af)
1603                         continue;
1604
1605                 af = nla_nest_start_noflag(skb, af_ops->family);
1606                 if (!af)
1607                         return -EMSGSIZE;
1608
1609                 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1610                 /*
1611                  * Caller may return ENODATA to indicate that there
1612                  * was no data to be dumped. This is not an error, it
1613                  * means we should trim the attribute header and
1614                  * continue.
1615                  */
1616                 if (err == -ENODATA)
1617                         nla_nest_cancel(skb, af);
1618                 else if (err < 0)
1619                         return -EMSGSIZE;
1620
1621                 nla_nest_end(skb, af);
1622         }
1623
1624         nla_nest_end(skb, af_spec);
1625         return 0;
1626 }
1627
1628 static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
1629                                  const struct net_device *dev)
1630 {
1631         struct netdev_name_node *name_node;
1632         int count = 0;
1633
1634         list_for_each_entry(name_node, &dev->name_node->list, list) {
1635                 if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
1636                         return -EMSGSIZE;
1637                 count++;
1638         }
1639         return count;
1640 }
1641
1642 static int rtnl_fill_prop_list(struct sk_buff *skb,
1643                                const struct net_device *dev)
1644 {
1645         struct nlattr *prop_list;
1646         int ret;
1647
1648         prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
1649         if (!prop_list)
1650                 return -EMSGSIZE;
1651
1652         ret = rtnl_fill_alt_ifnames(skb, dev);
1653         if (ret <= 0)
1654                 goto nest_cancel;
1655
1656         nla_nest_end(skb, prop_list);
1657         return 0;
1658
1659 nest_cancel:
1660         nla_nest_cancel(skb, prop_list);
1661         return ret;
1662 }
1663
1664 static int rtnl_fill_proto_down(struct sk_buff *skb,
1665                                 const struct net_device *dev)
1666 {
1667         struct nlattr *pr;
1668         u32 preason;
1669
1670         if (nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1671                 goto nla_put_failure;
1672
1673         preason = dev->proto_down_reason;
1674         if (!preason)
1675                 return 0;
1676
1677         pr = nla_nest_start(skb, IFLA_PROTO_DOWN_REASON);
1678         if (!pr)
1679                 return -EMSGSIZE;
1680
1681         if (nla_put_u32(skb, IFLA_PROTO_DOWN_REASON_VALUE, preason)) {
1682                 nla_nest_cancel(skb, pr);
1683                 goto nla_put_failure;
1684         }
1685
1686         nla_nest_end(skb, pr);
1687         return 0;
1688
1689 nla_put_failure:
1690         return -EMSGSIZE;
1691 }
1692
1693 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1694                             struct net_device *dev, struct net *src_net,
1695                             int type, u32 pid, u32 seq, u32 change,
1696                             unsigned int flags, u32 ext_filter_mask,
1697                             u32 event, int *new_nsid, int new_ifindex,
1698                             int tgt_netnsid, gfp_t gfp)
1699 {
1700         struct ifinfomsg *ifm;
1701         struct nlmsghdr *nlh;
1702         struct Qdisc *qdisc;
1703
1704         ASSERT_RTNL();
1705         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1706         if (nlh == NULL)
1707                 return -EMSGSIZE;
1708
1709         ifm = nlmsg_data(nlh);
1710         ifm->ifi_family = AF_UNSPEC;
1711         ifm->__ifi_pad = 0;
1712         ifm->ifi_type = dev->type;
1713         ifm->ifi_index = dev->ifindex;
1714         ifm->ifi_flags = dev_get_flags(dev);
1715         ifm->ifi_change = change;
1716
1717         if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1718                 goto nla_put_failure;
1719
1720         qdisc = rtnl_dereference(dev->qdisc);
1721         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1722             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1723             nla_put_u8(skb, IFLA_OPERSTATE,
1724                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1725             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1726             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1727             nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1728             nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1729             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1730             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1731             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1732             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1733             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1734             nla_put_u32(skb, IFLA_GRO_MAX_SIZE, dev->gro_max_size) ||
1735 #ifdef CONFIG_RPS
1736             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1737 #endif
1738             put_master_ifindex(skb, dev) ||
1739             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1740             (qdisc &&
1741              nla_put_string(skb, IFLA_QDISC, qdisc->ops->id)) ||
1742             nla_put_ifalias(skb, dev) ||
1743             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1744                         atomic_read(&dev->carrier_up_count) +
1745                         atomic_read(&dev->carrier_down_count)) ||
1746             nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1747                         atomic_read(&dev->carrier_up_count)) ||
1748             nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1749                         atomic_read(&dev->carrier_down_count)))
1750                 goto nla_put_failure;
1751
1752         if (rtnl_fill_proto_down(skb, dev))
1753                 goto nla_put_failure;
1754
1755         if (event != IFLA_EVENT_NONE) {
1756                 if (nla_put_u32(skb, IFLA_EVENT, event))
1757                         goto nla_put_failure;
1758         }
1759
1760         if (rtnl_fill_link_ifmap(skb, dev))
1761                 goto nla_put_failure;
1762
1763         if (dev->addr_len) {
1764                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1765                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1766                         goto nla_put_failure;
1767         }
1768
1769         if (rtnl_phys_port_id_fill(skb, dev))
1770                 goto nla_put_failure;
1771
1772         if (rtnl_phys_port_name_fill(skb, dev))
1773                 goto nla_put_failure;
1774
1775         if (rtnl_phys_switch_id_fill(skb, dev))
1776                 goto nla_put_failure;
1777
1778         if (rtnl_fill_stats(skb, dev))
1779                 goto nla_put_failure;
1780
1781         if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1782                 goto nla_put_failure;
1783
1784         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1785                 goto nla_put_failure;
1786
1787         if (rtnl_xdp_fill(skb, dev))
1788                 goto nla_put_failure;
1789
1790         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1791                 if (rtnl_link_fill(skb, dev) < 0)
1792                         goto nla_put_failure;
1793         }
1794
1795         if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1796                 goto nla_put_failure;
1797
1798         if (new_nsid &&
1799             nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1800                 goto nla_put_failure;
1801         if (new_ifindex &&
1802             nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1803                 goto nla_put_failure;
1804
1805         if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
1806             nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
1807                 goto nla_put_failure;
1808
1809         rcu_read_lock();
1810         if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1811                 goto nla_put_failure_rcu;
1812         rcu_read_unlock();
1813
1814         if (rtnl_fill_prop_list(skb, dev))
1815                 goto nla_put_failure;
1816
1817         if (dev->dev.parent &&
1818             nla_put_string(skb, IFLA_PARENT_DEV_NAME,
1819                            dev_name(dev->dev.parent)))
1820                 goto nla_put_failure;
1821
1822         if (dev->dev.parent && dev->dev.parent->bus &&
1823             nla_put_string(skb, IFLA_PARENT_DEV_BUS_NAME,
1824                            dev->dev.parent->bus->name))
1825                 goto nla_put_failure;
1826
1827         nlmsg_end(skb, nlh);
1828         return 0;
1829
1830 nla_put_failure_rcu:
1831         rcu_read_unlock();
1832 nla_put_failure:
1833         nlmsg_cancel(skb, nlh);
1834         return -EMSGSIZE;
1835 }
1836
1837 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1838         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1839         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1840         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1841         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1842         [IFLA_MTU]              = { .type = NLA_U32 },
1843         [IFLA_LINK]             = { .type = NLA_U32 },
1844         [IFLA_MASTER]           = { .type = NLA_U32 },
1845         [IFLA_CARRIER]          = { .type = NLA_U8 },
1846         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1847         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1848         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1849         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1850         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1851         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1852         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1853         /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1854          * allow 0-length string (needed to remove an alias).
1855          */
1856         [IFLA_IFALIAS]          = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1857         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1858         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1859         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1860         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1861         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1862         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1863         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1864         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1865         [IFLA_GSO_MAX_SEGS]     = { .type = NLA_U32 },
1866         [IFLA_GSO_MAX_SIZE]     = { .type = NLA_U32 },
1867         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1868         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1869         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1870         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1871         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1872         [IFLA_XDP]              = { .type = NLA_NESTED },
1873         [IFLA_EVENT]            = { .type = NLA_U32 },
1874         [IFLA_GROUP]            = { .type = NLA_U32 },
1875         [IFLA_TARGET_NETNSID]   = { .type = NLA_S32 },
1876         [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1877         [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1878         [IFLA_MIN_MTU]          = { .type = NLA_U32 },
1879         [IFLA_MAX_MTU]          = { .type = NLA_U32 },
1880         [IFLA_PROP_LIST]        = { .type = NLA_NESTED },
1881         [IFLA_ALT_IFNAME]       = { .type = NLA_STRING,
1882                                     .len = ALTIFNAMSIZ - 1 },
1883         [IFLA_PERM_ADDRESS]     = { .type = NLA_REJECT },
1884         [IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED },
1885         [IFLA_NEW_IFINDEX]      = NLA_POLICY_MIN(NLA_S32, 1),
1886         [IFLA_PARENT_DEV_NAME]  = { .type = NLA_NUL_STRING },
1887         [IFLA_GRO_MAX_SIZE]     = { .type = NLA_U32 },
1888 };
1889
1890 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1891         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1892         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1893         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1894         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1895 };
1896
1897 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1898         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1899         [IFLA_VF_BROADCAST]     = { .type = NLA_REJECT },
1900         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1901         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1902         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1903         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1904         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1905         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1906         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1907         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1908         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1909         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1910         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1911 };
1912
1913 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1914         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1915         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1916                                     .len = PORT_PROFILE_MAX },
1917         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1918                                       .len = PORT_UUID_MAX },
1919         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1920                                     .len = PORT_UUID_MAX },
1921         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1922         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1923
1924         /* Unused, but we need to keep it here since user space could
1925          * fill it. It's also broken with regard to NLA_BINARY use in
1926          * combination with structs.
1927          */
1928         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1929                                     .len = sizeof(struct ifla_port_vsi) },
1930 };
1931
1932 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1933         [IFLA_XDP_UNSPEC]       = { .strict_start_type = IFLA_XDP_EXPECTED_FD },
1934         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1935         [IFLA_XDP_EXPECTED_FD]  = { .type = NLA_S32 },
1936         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1937         [IFLA_XDP_FLAGS]        = { .type = NLA_U32 },
1938         [IFLA_XDP_PROG_ID]      = { .type = NLA_U32 },
1939 };
1940
1941 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1942 {
1943         const struct rtnl_link_ops *ops = NULL;
1944         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1945
1946         if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
1947                 return NULL;
1948
1949         if (linfo[IFLA_INFO_KIND]) {
1950                 char kind[MODULE_NAME_LEN];
1951
1952                 nla_strscpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1953                 ops = rtnl_link_ops_get(kind);
1954         }
1955
1956         return ops;
1957 }
1958
1959 static bool link_master_filtered(struct net_device *dev, int master_idx)
1960 {
1961         struct net_device *master;
1962
1963         if (!master_idx)
1964                 return false;
1965
1966         master = netdev_master_upper_dev_get(dev);
1967
1968         /* 0 is already used to denote IFLA_MASTER wasn't passed, therefore need
1969          * another invalid value for ifindex to denote "no master".
1970          */
1971         if (master_idx == -1)
1972                 return !!master;
1973
1974         if (!master || master->ifindex != master_idx)
1975                 return true;
1976
1977         return false;
1978 }
1979
1980 static bool link_kind_filtered(const struct net_device *dev,
1981                                const struct rtnl_link_ops *kind_ops)
1982 {
1983         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1984                 return true;
1985
1986         return false;
1987 }
1988
1989 static bool link_dump_filtered(struct net_device *dev,
1990                                int master_idx,
1991                                const struct rtnl_link_ops *kind_ops)
1992 {
1993         if (link_master_filtered(dev, master_idx) ||
1994             link_kind_filtered(dev, kind_ops))
1995                 return true;
1996
1997         return false;
1998 }
1999
2000 /**
2001  * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
2002  * @sk: netlink socket
2003  * @netnsid: network namespace identifier
2004  *
2005  * Returns the network namespace identified by netnsid on success or an error
2006  * pointer on failure.
2007  */
2008 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
2009 {
2010         struct net *net;
2011
2012         net = get_net_ns_by_id(sock_net(sk), netnsid);
2013         if (!net)
2014                 return ERR_PTR(-EINVAL);
2015
2016         /* For now, the caller is required to have CAP_NET_ADMIN in
2017          * the user namespace owning the target net ns.
2018          */
2019         if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
2020                 put_net(net);
2021                 return ERR_PTR(-EACCES);
2022         }
2023         return net;
2024 }
2025 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
2026
2027 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
2028                                       bool strict_check, struct nlattr **tb,
2029                                       struct netlink_ext_ack *extack)
2030 {
2031         int hdrlen;
2032
2033         if (strict_check) {
2034                 struct ifinfomsg *ifm;
2035
2036                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2037                         NL_SET_ERR_MSG(extack, "Invalid header for link dump");
2038                         return -EINVAL;
2039                 }
2040
2041                 ifm = nlmsg_data(nlh);
2042                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2043                     ifm->ifi_change) {
2044                         NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
2045                         return -EINVAL;
2046                 }
2047                 if (ifm->ifi_index) {
2048                         NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
2049                         return -EINVAL;
2050                 }
2051
2052                 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
2053                                                      IFLA_MAX, ifla_policy,
2054                                                      extack);
2055         }
2056
2057         /* A hack to preserve kernel<->userspace interface.
2058          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
2059          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
2060          * what iproute2 < v3.9.0 used.
2061          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
2062          * attribute, its netlink message is shorter than struct ifinfomsg.
2063          */
2064         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2065                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2066
2067         return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
2068                                       extack);
2069 }
2070
2071 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2072 {
2073         struct netlink_ext_ack *extack = cb->extack;
2074         const struct nlmsghdr *nlh = cb->nlh;
2075         struct net *net = sock_net(skb->sk);
2076         struct net *tgt_net = net;
2077         int h, s_h;
2078         int idx = 0, s_idx;
2079         struct net_device *dev;
2080         struct hlist_head *head;
2081         struct nlattr *tb[IFLA_MAX+1];
2082         u32 ext_filter_mask = 0;
2083         const struct rtnl_link_ops *kind_ops = NULL;
2084         unsigned int flags = NLM_F_MULTI;
2085         int master_idx = 0;
2086         int netnsid = -1;
2087         int err, i;
2088
2089         s_h = cb->args[0];
2090         s_idx = cb->args[1];
2091
2092         err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
2093         if (err < 0) {
2094                 if (cb->strict_check)
2095                         return err;
2096
2097                 goto walk_entries;
2098         }
2099
2100         for (i = 0; i <= IFLA_MAX; ++i) {
2101                 if (!tb[i])
2102                         continue;
2103
2104                 /* new attributes should only be added with strict checking */
2105                 switch (i) {
2106                 case IFLA_TARGET_NETNSID:
2107                         netnsid = nla_get_s32(tb[i]);
2108                         tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
2109                         if (IS_ERR(tgt_net)) {
2110                                 NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
2111                                 return PTR_ERR(tgt_net);
2112                         }
2113                         break;
2114                 case IFLA_EXT_MASK:
2115                         ext_filter_mask = nla_get_u32(tb[i]);
2116                         break;
2117                 case IFLA_MASTER:
2118                         master_idx = nla_get_u32(tb[i]);
2119                         break;
2120                 case IFLA_LINKINFO:
2121                         kind_ops = linkinfo_to_kind_ops(tb[i]);
2122                         break;
2123                 default:
2124                         if (cb->strict_check) {
2125                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
2126                                 return -EINVAL;
2127                         }
2128                 }
2129         }
2130
2131         if (master_idx || kind_ops)
2132                 flags |= NLM_F_DUMP_FILTERED;
2133
2134 walk_entries:
2135         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2136                 idx = 0;
2137                 head = &tgt_net->dev_index_head[h];
2138                 hlist_for_each_entry(dev, head, index_hlist) {
2139                         if (link_dump_filtered(dev, master_idx, kind_ops))
2140                                 goto cont;
2141                         if (idx < s_idx)
2142                                 goto cont;
2143                         err = rtnl_fill_ifinfo(skb, dev, net,
2144                                                RTM_NEWLINK,
2145                                                NETLINK_CB(cb->skb).portid,
2146                                                nlh->nlmsg_seq, 0, flags,
2147                                                ext_filter_mask, 0, NULL, 0,
2148                                                netnsid, GFP_KERNEL);
2149
2150                         if (err < 0) {
2151                                 if (likely(skb->len))
2152                                         goto out;
2153
2154                                 goto out_err;
2155                         }
2156 cont:
2157                         idx++;
2158                 }
2159         }
2160 out:
2161         err = skb->len;
2162 out_err:
2163         cb->args[1] = idx;
2164         cb->args[0] = h;
2165         cb->seq = tgt_net->dev_base_seq;
2166         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2167         if (netnsid >= 0)
2168                 put_net(tgt_net);
2169
2170         return err;
2171 }
2172
2173 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2174                         struct netlink_ext_ack *exterr)
2175 {
2176         return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
2177                                     exterr);
2178 }
2179 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
2180
2181 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2182 {
2183         struct net *net;
2184         /* Examine the link attributes and figure out which
2185          * network namespace we are talking about.
2186          */
2187         if (tb[IFLA_NET_NS_PID])
2188                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2189         else if (tb[IFLA_NET_NS_FD])
2190                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2191         else
2192                 net = get_net(src_net);
2193         return net;
2194 }
2195 EXPORT_SYMBOL(rtnl_link_get_net);
2196
2197 /* Figure out which network namespace we are talking about by
2198  * examining the link attributes in the following order:
2199  *
2200  * 1. IFLA_NET_NS_PID
2201  * 2. IFLA_NET_NS_FD
2202  * 3. IFLA_TARGET_NETNSID
2203  */
2204 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2205                                                struct nlattr *tb[])
2206 {
2207         struct net *net;
2208
2209         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2210                 return rtnl_link_get_net(src_net, tb);
2211
2212         if (!tb[IFLA_TARGET_NETNSID])
2213                 return get_net(src_net);
2214
2215         net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2216         if (!net)
2217                 return ERR_PTR(-EINVAL);
2218
2219         return net;
2220 }
2221
2222 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2223                                              struct net *src_net,
2224                                              struct nlattr *tb[], int cap)
2225 {
2226         struct net *net;
2227
2228         net = rtnl_link_get_net_by_nlattr(src_net, tb);
2229         if (IS_ERR(net))
2230                 return net;
2231
2232         if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2233                 put_net(net);
2234                 return ERR_PTR(-EPERM);
2235         }
2236
2237         return net;
2238 }
2239
2240 /* Verify that rtnetlink requests do not pass additional properties
2241  * potentially referring to different network namespaces.
2242  */
2243 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2244                                     struct netlink_ext_ack *extack,
2245                                     bool netns_id_only)
2246 {
2247
2248         if (netns_id_only) {
2249                 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2250                         return 0;
2251
2252                 NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2253                 return -EOPNOTSUPP;
2254         }
2255
2256         if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2257                 goto invalid_attr;
2258
2259         if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2260                 goto invalid_attr;
2261
2262         if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2263                 goto invalid_attr;
2264
2265         return 0;
2266
2267 invalid_attr:
2268         NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2269         return -EINVAL;
2270 }
2271
2272 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[],
2273                             struct netlink_ext_ack *extack)
2274 {
2275         if (dev) {
2276                 if (tb[IFLA_ADDRESS] &&
2277                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2278                         return -EINVAL;
2279
2280                 if (tb[IFLA_BROADCAST] &&
2281                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2282                         return -EINVAL;
2283         }
2284
2285         if (tb[IFLA_AF_SPEC]) {
2286                 struct nlattr *af;
2287                 int rem, err;
2288
2289                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2290                         const struct rtnl_af_ops *af_ops;
2291
2292                         af_ops = rtnl_af_lookup(nla_type(af));
2293                         if (!af_ops)
2294                                 return -EAFNOSUPPORT;
2295
2296                         if (!af_ops->set_link_af)
2297                                 return -EOPNOTSUPP;
2298
2299                         if (af_ops->validate_link_af) {
2300                                 err = af_ops->validate_link_af(dev, af, extack);
2301                                 if (err < 0)
2302                                         return err;
2303                         }
2304                 }
2305         }
2306
2307         if (tb[IFLA_GRO_MAX_SIZE]) {
2308                 u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_MAX_SIZE]);
2309
2310                 if (gro_max_size > GRO_MAX_SIZE) {
2311                         NL_SET_ERR_MSG(extack, "too big gro_max_size");
2312                         return -EINVAL;
2313                 }
2314         }
2315         return 0;
2316 }
2317
2318 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2319                                   int guid_type)
2320 {
2321         const struct net_device_ops *ops = dev->netdev_ops;
2322
2323         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2324 }
2325
2326 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2327 {
2328         if (dev->type != ARPHRD_INFINIBAND)
2329                 return -EOPNOTSUPP;
2330
2331         return handle_infiniband_guid(dev, ivt, guid_type);
2332 }
2333
2334 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2335 {
2336         const struct net_device_ops *ops = dev->netdev_ops;
2337         int err = -EINVAL;
2338
2339         if (tb[IFLA_VF_MAC]) {
2340                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2341
2342                 if (ivm->vf >= INT_MAX)
2343                         return -EINVAL;
2344                 err = -EOPNOTSUPP;
2345                 if (ops->ndo_set_vf_mac)
2346                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
2347                                                   ivm->mac);
2348                 if (err < 0)
2349                         return err;
2350         }
2351
2352         if (tb[IFLA_VF_VLAN]) {
2353                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2354
2355                 if (ivv->vf >= INT_MAX)
2356                         return -EINVAL;
2357                 err = -EOPNOTSUPP;
2358                 if (ops->ndo_set_vf_vlan)
2359                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2360                                                    ivv->qos,
2361                                                    htons(ETH_P_8021Q));
2362                 if (err < 0)
2363                         return err;
2364         }
2365
2366         if (tb[IFLA_VF_VLAN_LIST]) {
2367                 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2368                 struct nlattr *attr;
2369                 int rem, len = 0;
2370
2371                 err = -EOPNOTSUPP;
2372                 if (!ops->ndo_set_vf_vlan)
2373                         return err;
2374
2375                 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2376                         if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2377                             nla_len(attr) < NLA_HDRLEN) {
2378                                 return -EINVAL;
2379                         }
2380                         if (len >= MAX_VLAN_LIST_LEN)
2381                                 return -EOPNOTSUPP;
2382                         ivvl[len] = nla_data(attr);
2383
2384                         len++;
2385                 }
2386                 if (len == 0)
2387                         return -EINVAL;
2388
2389                 if (ivvl[0]->vf >= INT_MAX)
2390                         return -EINVAL;
2391                 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2392                                            ivvl[0]->qos, ivvl[0]->vlan_proto);
2393                 if (err < 0)
2394                         return err;
2395         }
2396
2397         if (tb[IFLA_VF_TX_RATE]) {
2398                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2399                 struct ifla_vf_info ivf;
2400
2401                 if (ivt->vf >= INT_MAX)
2402                         return -EINVAL;
2403                 err = -EOPNOTSUPP;
2404                 if (ops->ndo_get_vf_config)
2405                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2406                 if (err < 0)
2407                         return err;
2408
2409                 err = -EOPNOTSUPP;
2410                 if (ops->ndo_set_vf_rate)
2411                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2412                                                    ivf.min_tx_rate,
2413                                                    ivt->rate);
2414                 if (err < 0)
2415                         return err;
2416         }
2417
2418         if (tb[IFLA_VF_RATE]) {
2419                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2420
2421                 if (ivt->vf >= INT_MAX)
2422                         return -EINVAL;
2423                 err = -EOPNOTSUPP;
2424                 if (ops->ndo_set_vf_rate)
2425                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2426                                                    ivt->min_tx_rate,
2427                                                    ivt->max_tx_rate);
2428                 if (err < 0)
2429                         return err;
2430         }
2431
2432         if (tb[IFLA_VF_SPOOFCHK]) {
2433                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2434
2435                 if (ivs->vf >= INT_MAX)
2436                         return -EINVAL;
2437                 err = -EOPNOTSUPP;
2438                 if (ops->ndo_set_vf_spoofchk)
2439                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2440                                                        ivs->setting);
2441                 if (err < 0)
2442                         return err;
2443         }
2444
2445         if (tb[IFLA_VF_LINK_STATE]) {
2446                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2447
2448                 if (ivl->vf >= INT_MAX)
2449                         return -EINVAL;
2450                 err = -EOPNOTSUPP;
2451                 if (ops->ndo_set_vf_link_state)
2452                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2453                                                          ivl->link_state);
2454                 if (err < 0)
2455                         return err;
2456         }
2457
2458         if (tb[IFLA_VF_RSS_QUERY_EN]) {
2459                 struct ifla_vf_rss_query_en *ivrssq_en;
2460
2461                 err = -EOPNOTSUPP;
2462                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2463                 if (ivrssq_en->vf >= INT_MAX)
2464                         return -EINVAL;
2465                 if (ops->ndo_set_vf_rss_query_en)
2466                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2467                                                            ivrssq_en->setting);
2468                 if (err < 0)
2469                         return err;
2470         }
2471
2472         if (tb[IFLA_VF_TRUST]) {
2473                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2474
2475                 if (ivt->vf >= INT_MAX)
2476                         return -EINVAL;
2477                 err = -EOPNOTSUPP;
2478                 if (ops->ndo_set_vf_trust)
2479                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2480                 if (err < 0)
2481                         return err;
2482         }
2483
2484         if (tb[IFLA_VF_IB_NODE_GUID]) {
2485                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2486
2487                 if (ivt->vf >= INT_MAX)
2488                         return -EINVAL;
2489                 if (!ops->ndo_set_vf_guid)
2490                         return -EOPNOTSUPP;
2491                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2492         }
2493
2494         if (tb[IFLA_VF_IB_PORT_GUID]) {
2495                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2496
2497                 if (ivt->vf >= INT_MAX)
2498                         return -EINVAL;
2499                 if (!ops->ndo_set_vf_guid)
2500                         return -EOPNOTSUPP;
2501
2502                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2503         }
2504
2505         return err;
2506 }
2507
2508 static int do_set_master(struct net_device *dev, int ifindex,
2509                          struct netlink_ext_ack *extack)
2510 {
2511         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2512         const struct net_device_ops *ops;
2513         int err;
2514
2515         if (upper_dev) {
2516                 if (upper_dev->ifindex == ifindex)
2517                         return 0;
2518                 ops = upper_dev->netdev_ops;
2519                 if (ops->ndo_del_slave) {
2520                         err = ops->ndo_del_slave(upper_dev, dev);
2521                         if (err)
2522                                 return err;
2523                 } else {
2524                         return -EOPNOTSUPP;
2525                 }
2526         }
2527
2528         if (ifindex) {
2529                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2530                 if (!upper_dev)
2531                         return -EINVAL;
2532                 ops = upper_dev->netdev_ops;
2533                 if (ops->ndo_add_slave) {
2534                         err = ops->ndo_add_slave(upper_dev, dev, extack);
2535                         if (err)
2536                                 return err;
2537                 } else {
2538                         return -EOPNOTSUPP;
2539                 }
2540         }
2541         return 0;
2542 }
2543
2544 static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = {
2545         [IFLA_PROTO_DOWN_REASON_MASK]   = { .type = NLA_U32 },
2546         [IFLA_PROTO_DOWN_REASON_VALUE]  = { .type = NLA_U32 },
2547 };
2548
2549 static int do_set_proto_down(struct net_device *dev,
2550                              struct nlattr *nl_proto_down,
2551                              struct nlattr *nl_proto_down_reason,
2552                              struct netlink_ext_ack *extack)
2553 {
2554         struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1];
2555         unsigned long mask = 0;
2556         u32 value;
2557         bool proto_down;
2558         int err;
2559
2560         if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN)) {
2561                 NL_SET_ERR_MSG(extack,  "Protodown not supported by device");
2562                 return -EOPNOTSUPP;
2563         }
2564
2565         if (nl_proto_down_reason) {
2566                 err = nla_parse_nested_deprecated(pdreason,
2567                                                   IFLA_PROTO_DOWN_REASON_MAX,
2568                                                   nl_proto_down_reason,
2569                                                   ifla_proto_down_reason_policy,
2570                                                   NULL);
2571                 if (err < 0)
2572                         return err;
2573
2574                 if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) {
2575                         NL_SET_ERR_MSG(extack, "Invalid protodown reason value");
2576                         return -EINVAL;
2577                 }
2578
2579                 value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]);
2580
2581                 if (pdreason[IFLA_PROTO_DOWN_REASON_MASK])
2582                         mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]);
2583
2584                 dev_change_proto_down_reason(dev, mask, value);
2585         }
2586
2587         if (nl_proto_down) {
2588                 proto_down = nla_get_u8(nl_proto_down);
2589
2590                 /* Don't turn off protodown if there are active reasons */
2591                 if (!proto_down && dev->proto_down_reason) {
2592                         NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons");
2593                         return -EBUSY;
2594                 }
2595                 err = dev_change_proto_down(dev,
2596                                             proto_down);
2597                 if (err)
2598                         return err;
2599         }
2600
2601         return 0;
2602 }
2603
2604 #define DO_SETLINK_MODIFIED     0x01
2605 /* notify flag means notify + modified. */
2606 #define DO_SETLINK_NOTIFY       0x03
2607 static int do_setlink(const struct sk_buff *skb,
2608                       struct net_device *dev, struct ifinfomsg *ifm,
2609                       struct netlink_ext_ack *extack,
2610                       struct nlattr **tb, char *ifname, int status)
2611 {
2612         const struct net_device_ops *ops = dev->netdev_ops;
2613         int err;
2614
2615         err = validate_linkmsg(dev, tb, extack);
2616         if (err < 0)
2617                 return err;
2618
2619         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2620                 const char *pat = ifname && ifname[0] ? ifname : NULL;
2621                 struct net *net;
2622                 int new_ifindex;
2623
2624                 net = rtnl_link_get_net_capable(skb, dev_net(dev),
2625                                                 tb, CAP_NET_ADMIN);
2626                 if (IS_ERR(net)) {
2627                         err = PTR_ERR(net);
2628                         goto errout;
2629                 }
2630
2631                 if (tb[IFLA_NEW_IFINDEX])
2632                         new_ifindex = nla_get_s32(tb[IFLA_NEW_IFINDEX]);
2633                 else
2634                         new_ifindex = 0;
2635
2636                 err = __dev_change_net_namespace(dev, net, pat, new_ifindex);
2637                 put_net(net);
2638                 if (err)
2639                         goto errout;
2640                 status |= DO_SETLINK_MODIFIED;
2641         }
2642
2643         if (tb[IFLA_MAP]) {
2644                 struct rtnl_link_ifmap *u_map;
2645                 struct ifmap k_map;
2646
2647                 if (!ops->ndo_set_config) {
2648                         err = -EOPNOTSUPP;
2649                         goto errout;
2650                 }
2651
2652                 if (!netif_device_present(dev)) {
2653                         err = -ENODEV;
2654                         goto errout;
2655                 }
2656
2657                 u_map = nla_data(tb[IFLA_MAP]);
2658                 k_map.mem_start = (unsigned long) u_map->mem_start;
2659                 k_map.mem_end = (unsigned long) u_map->mem_end;
2660                 k_map.base_addr = (unsigned short) u_map->base_addr;
2661                 k_map.irq = (unsigned char) u_map->irq;
2662                 k_map.dma = (unsigned char) u_map->dma;
2663                 k_map.port = (unsigned char) u_map->port;
2664
2665                 err = ops->ndo_set_config(dev, &k_map);
2666                 if (err < 0)
2667                         goto errout;
2668
2669                 status |= DO_SETLINK_NOTIFY;
2670         }
2671
2672         if (tb[IFLA_ADDRESS]) {
2673                 struct sockaddr *sa;
2674                 int len;
2675
2676                 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2677                                                   sizeof(*sa));
2678                 sa = kmalloc(len, GFP_KERNEL);
2679                 if (!sa) {
2680                         err = -ENOMEM;
2681                         goto errout;
2682                 }
2683                 sa->sa_family = dev->type;
2684                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2685                        dev->addr_len);
2686                 err = dev_set_mac_address_user(dev, sa, extack);
2687                 kfree(sa);
2688                 if (err)
2689                         goto errout;
2690                 status |= DO_SETLINK_MODIFIED;
2691         }
2692
2693         if (tb[IFLA_MTU]) {
2694                 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2695                 if (err < 0)
2696                         goto errout;
2697                 status |= DO_SETLINK_MODIFIED;
2698         }
2699
2700         if (tb[IFLA_GROUP]) {
2701                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2702                 status |= DO_SETLINK_NOTIFY;
2703         }
2704
2705         /*
2706          * Interface selected by interface index but interface
2707          * name provided implies that a name change has been
2708          * requested.
2709          */
2710         if (ifm->ifi_index > 0 && ifname[0]) {
2711                 err = dev_change_name(dev, ifname);
2712                 if (err < 0)
2713                         goto errout;
2714                 status |= DO_SETLINK_MODIFIED;
2715         }
2716
2717         if (tb[IFLA_IFALIAS]) {
2718                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2719                                     nla_len(tb[IFLA_IFALIAS]));
2720                 if (err < 0)
2721                         goto errout;
2722                 status |= DO_SETLINK_NOTIFY;
2723         }
2724
2725         if (tb[IFLA_BROADCAST]) {
2726                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2727                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2728         }
2729
2730         if (ifm->ifi_flags || ifm->ifi_change) {
2731                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2732                                        extack);
2733                 if (err < 0)
2734                         goto errout;
2735         }
2736
2737         if (tb[IFLA_MASTER]) {
2738                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2739                 if (err)
2740                         goto errout;
2741                 status |= DO_SETLINK_MODIFIED;
2742         }
2743
2744         if (tb[IFLA_CARRIER]) {
2745                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2746                 if (err)
2747                         goto errout;
2748                 status |= DO_SETLINK_MODIFIED;
2749         }
2750
2751         if (tb[IFLA_TXQLEN]) {
2752                 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2753
2754                 err = dev_change_tx_queue_len(dev, value);
2755                 if (err)
2756                         goto errout;
2757                 status |= DO_SETLINK_MODIFIED;
2758         }
2759
2760         if (tb[IFLA_GSO_MAX_SIZE]) {
2761                 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2762
2763                 if (max_size > GSO_MAX_SIZE) {
2764                         err = -EINVAL;
2765                         goto errout;
2766                 }
2767
2768                 if (dev->gso_max_size ^ max_size) {
2769                         netif_set_gso_max_size(dev, max_size);
2770                         status |= DO_SETLINK_MODIFIED;
2771                 }
2772         }
2773
2774         if (tb[IFLA_GSO_MAX_SEGS]) {
2775                 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2776
2777                 if (max_segs > GSO_MAX_SEGS) {
2778                         err = -EINVAL;
2779                         goto errout;
2780                 }
2781
2782                 if (dev->gso_max_segs ^ max_segs) {
2783                         netif_set_gso_max_segs(dev, max_segs);
2784                         status |= DO_SETLINK_MODIFIED;
2785                 }
2786         }
2787
2788         if (tb[IFLA_GRO_MAX_SIZE]) {
2789                 u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_MAX_SIZE]);
2790
2791                 if (dev->gro_max_size ^ gro_max_size) {
2792                         netif_set_gro_max_size(dev, gro_max_size);
2793                         status |= DO_SETLINK_MODIFIED;
2794                 }
2795         }
2796
2797         if (tb[IFLA_OPERSTATE])
2798                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2799
2800         if (tb[IFLA_LINKMODE]) {
2801                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2802
2803                 write_lock(&dev_base_lock);
2804                 if (dev->link_mode ^ value)
2805                         status |= DO_SETLINK_NOTIFY;
2806                 dev->link_mode = value;
2807                 write_unlock(&dev_base_lock);
2808         }
2809
2810         if (tb[IFLA_VFINFO_LIST]) {
2811                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2812                 struct nlattr *attr;
2813                 int rem;
2814
2815                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2816                         if (nla_type(attr) != IFLA_VF_INFO ||
2817                             nla_len(attr) < NLA_HDRLEN) {
2818                                 err = -EINVAL;
2819                                 goto errout;
2820                         }
2821                         err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
2822                                                           attr,
2823                                                           ifla_vf_policy,
2824                                                           NULL);
2825                         if (err < 0)
2826                                 goto errout;
2827                         err = do_setvfinfo(dev, vfinfo);
2828                         if (err < 0)
2829                                 goto errout;
2830                         status |= DO_SETLINK_NOTIFY;
2831                 }
2832         }
2833         err = 0;
2834
2835         if (tb[IFLA_VF_PORTS]) {
2836                 struct nlattr *port[IFLA_PORT_MAX+1];
2837                 struct nlattr *attr;
2838                 int vf;
2839                 int rem;
2840
2841                 err = -EOPNOTSUPP;
2842                 if (!ops->ndo_set_vf_port)
2843                         goto errout;
2844
2845                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2846                         if (nla_type(attr) != IFLA_VF_PORT ||
2847                             nla_len(attr) < NLA_HDRLEN) {
2848                                 err = -EINVAL;
2849                                 goto errout;
2850                         }
2851                         err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2852                                                           attr,
2853                                                           ifla_port_policy,
2854                                                           NULL);
2855                         if (err < 0)
2856                                 goto errout;
2857                         if (!port[IFLA_PORT_VF]) {
2858                                 err = -EOPNOTSUPP;
2859                                 goto errout;
2860                         }
2861                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2862                         err = ops->ndo_set_vf_port(dev, vf, port);
2863                         if (err < 0)
2864                                 goto errout;
2865                         status |= DO_SETLINK_NOTIFY;
2866                 }
2867         }
2868         err = 0;
2869
2870         if (tb[IFLA_PORT_SELF]) {
2871                 struct nlattr *port[IFLA_PORT_MAX+1];
2872
2873                 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2874                                                   tb[IFLA_PORT_SELF],
2875                                                   ifla_port_policy, NULL);
2876                 if (err < 0)
2877                         goto errout;
2878
2879                 err = -EOPNOTSUPP;
2880                 if (ops->ndo_set_vf_port)
2881                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2882                 if (err < 0)
2883                         goto errout;
2884                 status |= DO_SETLINK_NOTIFY;
2885         }
2886
2887         if (tb[IFLA_AF_SPEC]) {
2888                 struct nlattr *af;
2889                 int rem;
2890
2891                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2892                         const struct rtnl_af_ops *af_ops;
2893
2894                         BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2895
2896                         err = af_ops->set_link_af(dev, af, extack);
2897                         if (err < 0)
2898                                 goto errout;
2899
2900                         status |= DO_SETLINK_NOTIFY;
2901                 }
2902         }
2903         err = 0;
2904
2905         if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) {
2906                 err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN],
2907                                         tb[IFLA_PROTO_DOWN_REASON], extack);
2908                 if (err)
2909                         goto errout;
2910                 status |= DO_SETLINK_NOTIFY;
2911         }
2912
2913         if (tb[IFLA_XDP]) {
2914                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2915                 u32 xdp_flags = 0;
2916
2917                 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
2918                                                   tb[IFLA_XDP],
2919                                                   ifla_xdp_policy, NULL);
2920                 if (err < 0)
2921                         goto errout;
2922
2923                 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2924                         err = -EINVAL;
2925                         goto errout;
2926                 }
2927
2928                 if (xdp[IFLA_XDP_FLAGS]) {
2929                         xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2930                         if (xdp_flags & ~XDP_FLAGS_MASK) {
2931                                 err = -EINVAL;
2932                                 goto errout;
2933                         }
2934                         if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2935                                 err = -EINVAL;
2936                                 goto errout;
2937                         }
2938                 }
2939
2940                 if (xdp[IFLA_XDP_FD]) {
2941                         int expected_fd = -1;
2942
2943                         if (xdp_flags & XDP_FLAGS_REPLACE) {
2944                                 if (!xdp[IFLA_XDP_EXPECTED_FD]) {
2945                                         err = -EINVAL;
2946                                         goto errout;
2947                                 }
2948                                 expected_fd =
2949                                         nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]);
2950                         }
2951
2952                         err = dev_change_xdp_fd(dev, extack,
2953                                                 nla_get_s32(xdp[IFLA_XDP_FD]),
2954                                                 expected_fd,
2955                                                 xdp_flags);
2956                         if (err)
2957                                 goto errout;
2958                         status |= DO_SETLINK_NOTIFY;
2959                 }
2960         }
2961
2962 errout:
2963         if (status & DO_SETLINK_MODIFIED) {
2964                 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2965                         netdev_state_change(dev);
2966
2967                 if (err < 0)
2968                         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",
2969                                              dev->name);
2970         }
2971
2972         return err;
2973 }
2974
2975 static struct net_device *rtnl_dev_get(struct net *net,
2976                                        struct nlattr *ifname_attr,
2977                                        struct nlattr *altifname_attr,
2978                                        char *ifname)
2979 {
2980         char buffer[ALTIFNAMSIZ];
2981
2982         if (!ifname) {
2983                 ifname = buffer;
2984                 if (ifname_attr)
2985                         nla_strscpy(ifname, ifname_attr, IFNAMSIZ);
2986                 else if (altifname_attr)
2987                         nla_strscpy(ifname, altifname_attr, ALTIFNAMSIZ);
2988                 else
2989                         return NULL;
2990         }
2991
2992         return __dev_get_by_name(net, ifname);
2993 }
2994
2995 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2996                         struct netlink_ext_ack *extack)
2997 {
2998         struct net *net = sock_net(skb->sk);
2999         struct ifinfomsg *ifm;
3000         struct net_device *dev;
3001         int err;
3002         struct nlattr *tb[IFLA_MAX+1];
3003         char ifname[IFNAMSIZ];
3004
3005         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3006                                      ifla_policy, extack);
3007         if (err < 0)
3008                 goto errout;
3009
3010         err = rtnl_ensure_unique_netns(tb, extack, false);
3011         if (err < 0)
3012                 goto errout;
3013
3014         if (tb[IFLA_IFNAME])
3015                 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3016         else
3017                 ifname[0] = '\0';
3018
3019         err = -EINVAL;
3020         ifm = nlmsg_data(nlh);
3021         if (ifm->ifi_index > 0)
3022                 dev = __dev_get_by_index(net, ifm->ifi_index);
3023         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3024                 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
3025         else
3026                 goto errout;
3027
3028         if (dev == NULL) {
3029                 err = -ENODEV;
3030                 goto errout;
3031         }
3032
3033         err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
3034 errout:
3035         return err;
3036 }
3037
3038 static int rtnl_group_dellink(const struct net *net, int group)
3039 {
3040         struct net_device *dev, *aux;
3041         LIST_HEAD(list_kill);
3042         bool found = false;
3043
3044         if (!group)
3045                 return -EPERM;
3046
3047         for_each_netdev(net, dev) {
3048                 if (dev->group == group) {
3049                         const struct rtnl_link_ops *ops;
3050
3051                         found = true;
3052                         ops = dev->rtnl_link_ops;
3053                         if (!ops || !ops->dellink)
3054                                 return -EOPNOTSUPP;
3055                 }
3056         }
3057
3058         if (!found)
3059                 return -ENODEV;
3060
3061         for_each_netdev_safe(net, dev, aux) {
3062                 if (dev->group == group) {
3063                         const struct rtnl_link_ops *ops;
3064
3065                         ops = dev->rtnl_link_ops;
3066                         ops->dellink(dev, &list_kill);
3067                 }
3068         }
3069         unregister_netdevice_many(&list_kill);
3070
3071         return 0;
3072 }
3073
3074 int rtnl_delete_link(struct net_device *dev)
3075 {
3076         const struct rtnl_link_ops *ops;
3077         LIST_HEAD(list_kill);
3078
3079         ops = dev->rtnl_link_ops;
3080         if (!ops || !ops->dellink)
3081                 return -EOPNOTSUPP;
3082
3083         ops->dellink(dev, &list_kill);
3084         unregister_netdevice_many(&list_kill);
3085
3086         return 0;
3087 }
3088 EXPORT_SYMBOL_GPL(rtnl_delete_link);
3089
3090 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
3091                         struct netlink_ext_ack *extack)
3092 {
3093         struct net *net = sock_net(skb->sk);
3094         struct net *tgt_net = net;
3095         struct net_device *dev = NULL;
3096         struct ifinfomsg *ifm;
3097         struct nlattr *tb[IFLA_MAX+1];
3098         int err;
3099         int netnsid = -1;
3100
3101         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3102                                      ifla_policy, extack);
3103         if (err < 0)
3104                 return err;
3105
3106         err = rtnl_ensure_unique_netns(tb, extack, true);
3107         if (err < 0)
3108                 return err;
3109
3110         if (tb[IFLA_TARGET_NETNSID]) {
3111                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3112                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3113                 if (IS_ERR(tgt_net))
3114                         return PTR_ERR(tgt_net);
3115         }
3116
3117         err = -EINVAL;
3118         ifm = nlmsg_data(nlh);
3119         if (ifm->ifi_index > 0)
3120                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3121         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3122                 dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
3123                                    tb[IFLA_ALT_IFNAME], NULL);
3124         else if (tb[IFLA_GROUP])
3125                 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
3126         else
3127                 goto out;
3128
3129         if (!dev) {
3130                 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
3131                         err = -ENODEV;
3132
3133                 goto out;
3134         }
3135
3136         err = rtnl_delete_link(dev);
3137
3138 out:
3139         if (netnsid >= 0)
3140                 put_net(tgt_net);
3141
3142         return err;
3143 }
3144
3145 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
3146 {
3147         unsigned int old_flags;
3148         int err;
3149
3150         old_flags = dev->flags;
3151         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
3152                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
3153                                          NULL);
3154                 if (err < 0)
3155                         return err;
3156         }
3157
3158         if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
3159                 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
3160         } else {
3161                 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
3162                 __dev_notify_flags(dev, old_flags, ~0U);
3163         }
3164         return 0;
3165 }
3166 EXPORT_SYMBOL(rtnl_configure_link);
3167
3168 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
3169                                     unsigned char name_assign_type,
3170                                     const struct rtnl_link_ops *ops,
3171                                     struct nlattr *tb[],
3172                                     struct netlink_ext_ack *extack)
3173 {
3174         struct net_device *dev;
3175         unsigned int num_tx_queues = 1;
3176         unsigned int num_rx_queues = 1;
3177
3178         if (tb[IFLA_NUM_TX_QUEUES])
3179                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
3180         else if (ops->get_num_tx_queues)
3181                 num_tx_queues = ops->get_num_tx_queues();
3182
3183         if (tb[IFLA_NUM_RX_QUEUES])
3184                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
3185         else if (ops->get_num_rx_queues)
3186                 num_rx_queues = ops->get_num_rx_queues();
3187
3188         if (num_tx_queues < 1 || num_tx_queues > 4096) {
3189                 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
3190                 return ERR_PTR(-EINVAL);
3191         }
3192
3193         if (num_rx_queues < 1 || num_rx_queues > 4096) {
3194                 NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
3195                 return ERR_PTR(-EINVAL);
3196         }
3197
3198         if (ops->alloc) {
3199                 dev = ops->alloc(tb, ifname, name_assign_type,
3200                                  num_tx_queues, num_rx_queues);
3201                 if (IS_ERR(dev))
3202                         return dev;
3203         } else {
3204                 dev = alloc_netdev_mqs(ops->priv_size, ifname,
3205                                        name_assign_type, ops->setup,
3206                                        num_tx_queues, num_rx_queues);
3207         }
3208
3209         if (!dev)
3210                 return ERR_PTR(-ENOMEM);
3211
3212         dev_net_set(dev, net);
3213         dev->rtnl_link_ops = ops;
3214         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
3215
3216         if (tb[IFLA_MTU]) {
3217                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3218                 int err;
3219
3220                 err = dev_validate_mtu(dev, mtu, extack);
3221                 if (err) {
3222                         free_netdev(dev);
3223                         return ERR_PTR(err);
3224                 }
3225                 dev->mtu = mtu;
3226         }
3227         if (tb[IFLA_ADDRESS]) {
3228                 __dev_addr_set(dev, nla_data(tb[IFLA_ADDRESS]),
3229                                nla_len(tb[IFLA_ADDRESS]));
3230                 dev->addr_assign_type = NET_ADDR_SET;
3231         }
3232         if (tb[IFLA_BROADCAST])
3233                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
3234                                 nla_len(tb[IFLA_BROADCAST]));
3235         if (tb[IFLA_TXQLEN])
3236                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
3237         if (tb[IFLA_OPERSTATE])
3238                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
3239         if (tb[IFLA_LINKMODE])
3240                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
3241         if (tb[IFLA_GROUP])
3242                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
3243         if (tb[IFLA_GSO_MAX_SIZE])
3244                 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
3245         if (tb[IFLA_GSO_MAX_SEGS])
3246                 netif_set_gso_max_segs(dev, nla_get_u32(tb[IFLA_GSO_MAX_SEGS]));
3247         if (tb[IFLA_GRO_MAX_SIZE])
3248                 netif_set_gro_max_size(dev, nla_get_u32(tb[IFLA_GRO_MAX_SIZE]));
3249
3250         return dev;
3251 }
3252 EXPORT_SYMBOL(rtnl_create_link);
3253
3254 static int rtnl_group_changelink(const struct sk_buff *skb,
3255                 struct net *net, int group,
3256                 struct ifinfomsg *ifm,
3257                 struct netlink_ext_ack *extack,
3258                 struct nlattr **tb)
3259 {
3260         struct net_device *dev, *aux;
3261         int err;
3262
3263         for_each_netdev_safe(net, dev, aux) {
3264                 if (dev->group == group) {
3265                         err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
3266                         if (err < 0)
3267                                 return err;
3268                 }
3269         }
3270
3271         return 0;
3272 }
3273
3274 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3275                           struct nlattr **attr, struct netlink_ext_ack *extack)
3276 {
3277         struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3278         unsigned char name_assign_type = NET_NAME_USER;
3279         struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
3280         const struct rtnl_link_ops *m_ops;
3281         struct net_device *master_dev;
3282         struct net *net = sock_net(skb->sk);
3283         const struct rtnl_link_ops *ops;
3284         struct nlattr *tb[IFLA_MAX + 1];
3285         struct net *dest_net, *link_net;
3286         struct nlattr **slave_data;
3287         char kind[MODULE_NAME_LEN];
3288         struct net_device *dev;
3289         struct ifinfomsg *ifm;
3290         char ifname[IFNAMSIZ];
3291         struct nlattr **data;
3292         int err;
3293
3294 #ifdef CONFIG_MODULES
3295 replay:
3296 #endif
3297         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3298                                      ifla_policy, extack);
3299         if (err < 0)
3300                 return err;
3301
3302         err = rtnl_ensure_unique_netns(tb, extack, false);
3303         if (err < 0)
3304                 return err;
3305
3306         if (tb[IFLA_IFNAME])
3307                 nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3308         else
3309                 ifname[0] = '\0';
3310
3311         ifm = nlmsg_data(nlh);
3312         if (ifm->ifi_index > 0)
3313                 dev = __dev_get_by_index(net, ifm->ifi_index);
3314         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3315                 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
3316         else
3317                 dev = NULL;
3318
3319         master_dev = NULL;
3320         m_ops = NULL;
3321         if (dev) {
3322                 master_dev = netdev_master_upper_dev_get(dev);
3323                 if (master_dev)
3324                         m_ops = master_dev->rtnl_link_ops;
3325         }
3326
3327         err = validate_linkmsg(dev, tb, extack);
3328         if (err < 0)
3329                 return err;
3330
3331         if (tb[IFLA_LINKINFO]) {
3332                 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3333                                                   tb[IFLA_LINKINFO],
3334                                                   ifla_info_policy, NULL);
3335                 if (err < 0)
3336                         return err;
3337         } else
3338                 memset(linkinfo, 0, sizeof(linkinfo));
3339
3340         if (linkinfo[IFLA_INFO_KIND]) {
3341                 nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3342                 ops = rtnl_link_ops_get(kind);
3343         } else {
3344                 kind[0] = '\0';
3345                 ops = NULL;
3346         }
3347
3348         data = NULL;
3349         if (ops) {
3350                 if (ops->maxtype > RTNL_MAX_TYPE)
3351                         return -EINVAL;
3352
3353                 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3354                         err = nla_parse_nested_deprecated(attr, ops->maxtype,
3355                                                           linkinfo[IFLA_INFO_DATA],
3356                                                           ops->policy, extack);
3357                         if (err < 0)
3358                                 return err;
3359                         data = attr;
3360                 }
3361                 if (ops->validate) {
3362                         err = ops->validate(tb, data, extack);
3363                         if (err < 0)
3364                                 return err;
3365                 }
3366         }
3367
3368         slave_data = NULL;
3369         if (m_ops) {
3370                 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3371                         return -EINVAL;
3372
3373                 if (m_ops->slave_maxtype &&
3374                     linkinfo[IFLA_INFO_SLAVE_DATA]) {
3375                         err = nla_parse_nested_deprecated(slave_attr,
3376                                                           m_ops->slave_maxtype,
3377                                                           linkinfo[IFLA_INFO_SLAVE_DATA],
3378                                                           m_ops->slave_policy,
3379                                                           extack);
3380                         if (err < 0)
3381                                 return err;
3382                         slave_data = slave_attr;
3383                 }
3384         }
3385
3386         if (dev) {
3387                 int status = 0;
3388
3389                 if (nlh->nlmsg_flags & NLM_F_EXCL)
3390                         return -EEXIST;
3391                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3392                         return -EOPNOTSUPP;
3393
3394                 if (linkinfo[IFLA_INFO_DATA]) {
3395                         if (!ops || ops != dev->rtnl_link_ops ||
3396                             !ops->changelink)
3397                                 return -EOPNOTSUPP;
3398
3399                         err = ops->changelink(dev, tb, data, extack);
3400                         if (err < 0)
3401                                 return err;
3402                         status |= DO_SETLINK_NOTIFY;
3403                 }
3404
3405                 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3406                         if (!m_ops || !m_ops->slave_changelink)
3407                                 return -EOPNOTSUPP;
3408
3409                         err = m_ops->slave_changelink(master_dev, dev, tb,
3410                                                       slave_data, extack);
3411                         if (err < 0)
3412                                 return err;
3413                         status |= DO_SETLINK_NOTIFY;
3414                 }
3415
3416                 return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
3417         }
3418
3419         if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3420                 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3421                         return rtnl_group_changelink(skb, net,
3422                                                 nla_get_u32(tb[IFLA_GROUP]),
3423                                                 ifm, extack, tb);
3424                 return -ENODEV;
3425         }
3426
3427         if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3428                 return -EOPNOTSUPP;
3429
3430         if (!ops) {
3431 #ifdef CONFIG_MODULES
3432                 if (kind[0]) {
3433                         __rtnl_unlock();
3434                         request_module("rtnl-link-%s", kind);
3435                         rtnl_lock();
3436                         ops = rtnl_link_ops_get(kind);
3437                         if (ops)
3438                                 goto replay;
3439                 }
3440 #endif
3441                 NL_SET_ERR_MSG(extack, "Unknown device type");
3442                 return -EOPNOTSUPP;
3443         }
3444
3445         if (!ops->alloc && !ops->setup)
3446                 return -EOPNOTSUPP;
3447
3448         if (!ifname[0]) {
3449                 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3450                 name_assign_type = NET_NAME_ENUM;
3451         }
3452
3453         dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3454         if (IS_ERR(dest_net))
3455                 return PTR_ERR(dest_net);
3456
3457         if (tb[IFLA_LINK_NETNSID]) {
3458                 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3459
3460                 link_net = get_net_ns_by_id(dest_net, id);
3461                 if (!link_net) {
3462                         NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3463                         err =  -EINVAL;
3464                         goto out;
3465                 }
3466                 err = -EPERM;
3467                 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3468                         goto out;
3469         } else {
3470                 link_net = NULL;
3471         }
3472
3473         dev = rtnl_create_link(link_net ? : dest_net, ifname,
3474                                name_assign_type, ops, tb, extack);
3475         if (IS_ERR(dev)) {
3476                 err = PTR_ERR(dev);
3477                 goto out;
3478         }
3479
3480         dev->ifindex = ifm->ifi_index;
3481
3482         if (ops->newlink)
3483                 err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3484         else
3485                 err = register_netdevice(dev);
3486         if (err < 0) {
3487                 free_netdev(dev);
3488                 goto out;
3489         }
3490
3491         err = rtnl_configure_link(dev, ifm);
3492         if (err < 0)
3493                 goto out_unregister;
3494         if (link_net) {
3495                 err = dev_change_net_namespace(dev, dest_net, ifname);
3496                 if (err < 0)
3497                         goto out_unregister;
3498         }
3499         if (tb[IFLA_MASTER]) {
3500                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3501                 if (err)
3502                         goto out_unregister;
3503         }
3504 out:
3505         if (link_net)
3506                 put_net(link_net);
3507         put_net(dest_net);
3508         return err;
3509 out_unregister:
3510         if (ops->newlink) {
3511                 LIST_HEAD(list_kill);
3512
3513                 ops->dellink(dev, &list_kill);
3514                 unregister_netdevice_many(&list_kill);
3515         } else {
3516                 unregister_netdevice(dev);
3517         }
3518         goto out;
3519 }
3520
3521 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3522                         struct netlink_ext_ack *extack)
3523 {
3524         struct nlattr **attr;
3525         int ret;
3526
3527         attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
3528         if (!attr)
3529                 return -ENOMEM;
3530
3531         ret = __rtnl_newlink(skb, nlh, attr, extack);
3532         kfree(attr);
3533         return ret;
3534 }
3535
3536 static int rtnl_valid_getlink_req(struct sk_buff *skb,
3537                                   const struct nlmsghdr *nlh,
3538                                   struct nlattr **tb,
3539                                   struct netlink_ext_ack *extack)
3540 {
3541         struct ifinfomsg *ifm;
3542         int i, err;
3543
3544         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3545                 NL_SET_ERR_MSG(extack, "Invalid header for get link");
3546                 return -EINVAL;
3547         }
3548
3549         if (!netlink_strict_get_check(skb))
3550                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3551                                               ifla_policy, extack);
3552
3553         ifm = nlmsg_data(nlh);
3554         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3555             ifm->ifi_change) {
3556                 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3557                 return -EINVAL;
3558         }
3559
3560         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3561                                             ifla_policy, extack);
3562         if (err)
3563                 return err;
3564
3565         for (i = 0; i <= IFLA_MAX; i++) {
3566                 if (!tb[i])
3567                         continue;
3568
3569                 switch (i) {
3570                 case IFLA_IFNAME:
3571                 case IFLA_ALT_IFNAME:
3572                 case IFLA_EXT_MASK:
3573                 case IFLA_TARGET_NETNSID:
3574                         break;
3575                 default:
3576                         NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3577                         return -EINVAL;
3578                 }
3579         }
3580
3581         return 0;
3582 }
3583
3584 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3585                         struct netlink_ext_ack *extack)
3586 {
3587         struct net *net = sock_net(skb->sk);
3588         struct net *tgt_net = net;
3589         struct ifinfomsg *ifm;
3590         struct nlattr *tb[IFLA_MAX+1];
3591         struct net_device *dev = NULL;
3592         struct sk_buff *nskb;
3593         int netnsid = -1;
3594         int err;
3595         u32 ext_filter_mask = 0;
3596
3597         err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3598         if (err < 0)
3599                 return err;
3600
3601         err = rtnl_ensure_unique_netns(tb, extack, true);
3602         if (err < 0)
3603                 return err;
3604
3605         if (tb[IFLA_TARGET_NETNSID]) {
3606                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3607                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3608                 if (IS_ERR(tgt_net))
3609                         return PTR_ERR(tgt_net);
3610         }
3611
3612         if (tb[IFLA_EXT_MASK])
3613                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3614
3615         err = -EINVAL;
3616         ifm = nlmsg_data(nlh);
3617         if (ifm->ifi_index > 0)
3618                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3619         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3620                 dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME],
3621                                    tb[IFLA_ALT_IFNAME], NULL);
3622         else
3623                 goto out;
3624
3625         err = -ENODEV;
3626         if (dev == NULL)
3627                 goto out;
3628
3629         err = -ENOBUFS;
3630         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3631         if (nskb == NULL)
3632                 goto out;
3633
3634         err = rtnl_fill_ifinfo(nskb, dev, net,
3635                                RTM_NEWLINK, NETLINK_CB(skb).portid,
3636                                nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3637                                0, NULL, 0, netnsid, GFP_KERNEL);
3638         if (err < 0) {
3639                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3640                 WARN_ON(err == -EMSGSIZE);
3641                 kfree_skb(nskb);
3642         } else
3643                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3644 out:
3645         if (netnsid >= 0)
3646                 put_net(tgt_net);
3647
3648         return err;
3649 }
3650
3651 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
3652                            bool *changed, struct netlink_ext_ack *extack)
3653 {
3654         char *alt_ifname;
3655         int err;
3656
3657         err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
3658         if (err)
3659                 return err;
3660
3661         alt_ifname = nla_strdup(attr, GFP_KERNEL);
3662         if (!alt_ifname)
3663                 return -ENOMEM;
3664
3665         if (cmd == RTM_NEWLINKPROP) {
3666                 err = netdev_name_node_alt_create(dev, alt_ifname);
3667                 if (!err)
3668                         alt_ifname = NULL;
3669         } else if (cmd == RTM_DELLINKPROP) {
3670                 err = netdev_name_node_alt_destroy(dev, alt_ifname);
3671         } else {
3672                 WARN_ON_ONCE(1);
3673                 err = -EINVAL;
3674         }
3675
3676         kfree(alt_ifname);
3677         if (!err)
3678                 *changed = true;
3679         return err;
3680 }
3681
3682 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
3683                          struct netlink_ext_ack *extack)
3684 {
3685         struct net *net = sock_net(skb->sk);
3686         struct nlattr *tb[IFLA_MAX + 1];
3687         struct net_device *dev;
3688         struct ifinfomsg *ifm;
3689         bool changed = false;
3690         struct nlattr *attr;
3691         int err, rem;
3692
3693         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3694         if (err)
3695                 return err;
3696
3697         err = rtnl_ensure_unique_netns(tb, extack, true);
3698         if (err)
3699                 return err;
3700
3701         ifm = nlmsg_data(nlh);
3702         if (ifm->ifi_index > 0)
3703                 dev = __dev_get_by_index(net, ifm->ifi_index);
3704         else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3705                 dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
3706                                    tb[IFLA_ALT_IFNAME], NULL);
3707         else
3708                 return -EINVAL;
3709
3710         if (!dev)
3711                 return -ENODEV;
3712
3713         if (!tb[IFLA_PROP_LIST])
3714                 return 0;
3715
3716         nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
3717                 switch (nla_type(attr)) {
3718                 case IFLA_ALT_IFNAME:
3719                         err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
3720                         if (err)
3721                                 return err;
3722                         break;
3723                 }
3724         }
3725
3726         if (changed)
3727                 netdev_state_change(dev);
3728         return 0;
3729 }
3730
3731 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3732                             struct netlink_ext_ack *extack)
3733 {
3734         return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
3735 }
3736
3737 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3738                             struct netlink_ext_ack *extack)
3739 {
3740         return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
3741 }
3742
3743 static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3744 {
3745         struct net *net = sock_net(skb->sk);
3746         size_t min_ifinfo_dump_size = 0;
3747         struct nlattr *tb[IFLA_MAX+1];
3748         u32 ext_filter_mask = 0;
3749         struct net_device *dev;
3750         int hdrlen;
3751
3752         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3753         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3754                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3755
3756         if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3757                 if (tb[IFLA_EXT_MASK])
3758                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3759         }
3760
3761         if (!ext_filter_mask)
3762                 return NLMSG_GOODSIZE;
3763         /*
3764          * traverse the list of net devices and compute the minimum
3765          * buffer size based upon the filter mask.
3766          */
3767         rcu_read_lock();
3768         for_each_netdev_rcu(net, dev) {
3769                 min_ifinfo_dump_size = max(min_ifinfo_dump_size,
3770                                            if_nlmsg_size(dev, ext_filter_mask));
3771         }
3772         rcu_read_unlock();
3773
3774         return nlmsg_total_size(min_ifinfo_dump_size);
3775 }
3776
3777 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3778 {
3779         int idx;
3780         int s_idx = cb->family;
3781         int type = cb->nlh->nlmsg_type - RTM_BASE;
3782         int ret = 0;
3783
3784         if (s_idx == 0)
3785                 s_idx = 1;
3786
3787         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3788                 struct rtnl_link __rcu **tab;
3789                 struct rtnl_link *link;
3790                 rtnl_dumpit_func dumpit;
3791
3792                 if (idx < s_idx || idx == PF_PACKET)
3793                         continue;
3794
3795                 if (type < 0 || type >= RTM_NR_MSGTYPES)
3796                         continue;
3797
3798                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3799                 if (!tab)
3800                         continue;
3801
3802                 link = rcu_dereference_rtnl(tab[type]);
3803                 if (!link)
3804                         continue;
3805
3806                 dumpit = link->dumpit;
3807                 if (!dumpit)
3808                         continue;
3809
3810                 if (idx > s_idx) {
3811                         memset(&cb->args[0], 0, sizeof(cb->args));
3812                         cb->prev_seq = 0;
3813                         cb->seq = 0;
3814                 }
3815                 ret = dumpit(skb, cb);
3816                 if (ret)
3817                         break;
3818         }
3819         cb->family = idx;
3820
3821         return skb->len ? : ret;
3822 }
3823
3824 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3825                                        unsigned int change,
3826                                        u32 event, gfp_t flags, int *new_nsid,
3827                                        int new_ifindex)
3828 {
3829         struct net *net = dev_net(dev);
3830         struct sk_buff *skb;
3831         int err = -ENOBUFS;
3832
3833         skb = nlmsg_new(if_nlmsg_size(dev, 0), flags);
3834         if (skb == NULL)
3835                 goto errout;
3836
3837         err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3838                                type, 0, 0, change, 0, 0, event,
3839                                new_nsid, new_ifindex, -1, flags);
3840         if (err < 0) {
3841                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3842                 WARN_ON(err == -EMSGSIZE);
3843                 kfree_skb(skb);
3844                 goto errout;
3845         }
3846         return skb;
3847 errout:
3848         if (err < 0)
3849                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3850         return NULL;
3851 }
3852
3853 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3854 {
3855         struct net *net = dev_net(dev);
3856
3857         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3858 }
3859
3860 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3861                                unsigned int change, u32 event,
3862                                gfp_t flags, int *new_nsid, int new_ifindex)
3863 {
3864         struct sk_buff *skb;
3865
3866         if (dev->reg_state != NETREG_REGISTERED)
3867                 return;
3868
3869         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3870                                      new_ifindex);
3871         if (skb)
3872                 rtmsg_ifinfo_send(skb, dev, flags);
3873 }
3874
3875 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3876                   gfp_t flags)
3877 {
3878         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3879                            NULL, 0);
3880 }
3881
3882 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3883                          gfp_t flags, int *new_nsid, int new_ifindex)
3884 {
3885         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3886                            new_nsid, new_ifindex);
3887 }
3888
3889 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3890                                    struct net_device *dev,
3891                                    u8 *addr, u16 vid, u32 pid, u32 seq,
3892                                    int type, unsigned int flags,
3893                                    int nlflags, u16 ndm_state)
3894 {
3895         struct nlmsghdr *nlh;
3896         struct ndmsg *ndm;
3897
3898         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3899         if (!nlh)
3900                 return -EMSGSIZE;
3901
3902         ndm = nlmsg_data(nlh);
3903         ndm->ndm_family  = AF_BRIDGE;
3904         ndm->ndm_pad1    = 0;
3905         ndm->ndm_pad2    = 0;
3906         ndm->ndm_flags   = flags;
3907         ndm->ndm_type    = 0;
3908         ndm->ndm_ifindex = dev->ifindex;
3909         ndm->ndm_state   = ndm_state;
3910
3911         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3912                 goto nla_put_failure;
3913         if (vid)
3914                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3915                         goto nla_put_failure;
3916
3917         nlmsg_end(skb, nlh);
3918         return 0;
3919
3920 nla_put_failure:
3921         nlmsg_cancel(skb, nlh);
3922         return -EMSGSIZE;
3923 }
3924
3925 static inline size_t rtnl_fdb_nlmsg_size(void)
3926 {
3927         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3928                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
3929                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
3930                0;
3931 }
3932
3933 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3934                             u16 ndm_state)
3935 {
3936         struct net *net = dev_net(dev);
3937         struct sk_buff *skb;
3938         int err = -ENOBUFS;
3939
3940         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3941         if (!skb)
3942                 goto errout;
3943
3944         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3945                                       0, 0, type, NTF_SELF, 0, ndm_state);
3946         if (err < 0) {
3947                 kfree_skb(skb);
3948                 goto errout;
3949         }
3950
3951         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3952         return;
3953 errout:
3954         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3955 }
3956
3957 /*
3958  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3959  */
3960 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3961                      struct nlattr *tb[],
3962                      struct net_device *dev,
3963                      const unsigned char *addr, u16 vid,
3964                      u16 flags)
3965 {
3966         int err = -EINVAL;
3967
3968         /* If aging addresses are supported device will need to
3969          * implement its own handler for this.
3970          */
3971         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3972                 netdev_info(dev, "default FDB implementation only supports local addresses\n");
3973                 return err;
3974         }
3975
3976         if (vid) {
3977                 netdev_info(dev, "vlans aren't supported yet for dev_uc|mc_add()\n");
3978                 return err;
3979         }
3980
3981         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3982                 err = dev_uc_add_excl(dev, addr);
3983         else if (is_multicast_ether_addr(addr))
3984                 err = dev_mc_add_excl(dev, addr);
3985
3986         /* Only return duplicate errors if NLM_F_EXCL is set */
3987         if (err == -EEXIST && !(flags & NLM_F_EXCL))
3988                 err = 0;
3989
3990         return err;
3991 }
3992 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3993
3994 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3995                          struct netlink_ext_ack *extack)
3996 {
3997         u16 vid = 0;
3998
3999         if (vlan_attr) {
4000                 if (nla_len(vlan_attr) != sizeof(u16)) {
4001                         NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
4002                         return -EINVAL;
4003                 }
4004
4005                 vid = nla_get_u16(vlan_attr);
4006
4007                 if (!vid || vid >= VLAN_VID_MASK) {
4008                         NL_SET_ERR_MSG(extack, "invalid vlan id");
4009                         return -EINVAL;
4010                 }
4011         }
4012         *p_vid = vid;
4013         return 0;
4014 }
4015
4016 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
4017                         struct netlink_ext_ack *extack)
4018 {
4019         struct net *net = sock_net(skb->sk);
4020         struct ndmsg *ndm;
4021         struct nlattr *tb[NDA_MAX+1];
4022         struct net_device *dev;
4023         u8 *addr;
4024         u16 vid;
4025         int err;
4026
4027         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
4028                                      extack);
4029         if (err < 0)
4030                 return err;
4031
4032         ndm = nlmsg_data(nlh);
4033         if (ndm->ndm_ifindex == 0) {
4034                 NL_SET_ERR_MSG(extack, "invalid ifindex");
4035                 return -EINVAL;
4036         }
4037
4038         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4039         if (dev == NULL) {
4040                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4041                 return -ENODEV;
4042         }
4043
4044         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4045                 NL_SET_ERR_MSG(extack, "invalid address");
4046                 return -EINVAL;
4047         }
4048
4049         if (dev->type != ARPHRD_ETHER) {
4050                 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
4051                 return -EINVAL;
4052         }
4053
4054         addr = nla_data(tb[NDA_LLADDR]);
4055
4056         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4057         if (err)
4058                 return err;
4059
4060         err = -EOPNOTSUPP;
4061
4062         /* Support fdb on master device the net/bridge default case */
4063         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4064             netif_is_bridge_port(dev)) {
4065                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4066                 const struct net_device_ops *ops = br_dev->netdev_ops;
4067
4068                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
4069                                        nlh->nlmsg_flags, extack);
4070                 if (err)
4071                         goto out;
4072                 else
4073                         ndm->ndm_flags &= ~NTF_MASTER;
4074         }
4075
4076         /* Embedded bridge, macvlan, and any other device support */
4077         if ((ndm->ndm_flags & NTF_SELF)) {
4078                 if (dev->netdev_ops->ndo_fdb_add)
4079                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
4080                                                            vid,
4081                                                            nlh->nlmsg_flags,
4082                                                            extack);
4083                 else
4084                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
4085                                                nlh->nlmsg_flags);
4086
4087                 if (!err) {
4088                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
4089                                         ndm->ndm_state);
4090                         ndm->ndm_flags &= ~NTF_SELF;
4091                 }
4092         }
4093 out:
4094         return err;
4095 }
4096
4097 /*
4098  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
4099  */
4100 int ndo_dflt_fdb_del(struct ndmsg *ndm,
4101                      struct nlattr *tb[],
4102                      struct net_device *dev,
4103                      const unsigned char *addr, u16 vid)
4104 {
4105         int err = -EINVAL;
4106
4107         /* If aging addresses are supported device will need to
4108          * implement its own handler for this.
4109          */
4110         if (!(ndm->ndm_state & NUD_PERMANENT)) {
4111                 netdev_info(dev, "default FDB implementation only supports local addresses\n");
4112                 return err;
4113         }
4114
4115         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
4116                 err = dev_uc_del(dev, addr);
4117         else if (is_multicast_ether_addr(addr))
4118                 err = dev_mc_del(dev, addr);
4119
4120         return err;
4121 }
4122 EXPORT_SYMBOL(ndo_dflt_fdb_del);
4123
4124 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
4125                         struct netlink_ext_ack *extack)
4126 {
4127         struct net *net = sock_net(skb->sk);
4128         struct ndmsg *ndm;
4129         struct nlattr *tb[NDA_MAX+1];
4130         struct net_device *dev;
4131         __u8 *addr;
4132         int err;
4133         u16 vid;
4134
4135         if (!netlink_capable(skb, CAP_NET_ADMIN))
4136                 return -EPERM;
4137
4138         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
4139                                      extack);
4140         if (err < 0)
4141                 return err;
4142
4143         ndm = nlmsg_data(nlh);
4144         if (ndm->ndm_ifindex == 0) {
4145                 NL_SET_ERR_MSG(extack, "invalid ifindex");
4146                 return -EINVAL;
4147         }
4148
4149         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4150         if (dev == NULL) {
4151                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4152                 return -ENODEV;
4153         }
4154
4155         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4156                 NL_SET_ERR_MSG(extack, "invalid address");
4157                 return -EINVAL;
4158         }
4159
4160         if (dev->type != ARPHRD_ETHER) {
4161                 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
4162                 return -EINVAL;
4163         }
4164
4165         addr = nla_data(tb[NDA_LLADDR]);
4166
4167         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4168         if (err)
4169                 return err;
4170
4171         err = -EOPNOTSUPP;
4172
4173         /* Support fdb on master device the net/bridge default case */
4174         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4175             netif_is_bridge_port(dev)) {
4176                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4177                 const struct net_device_ops *ops = br_dev->netdev_ops;
4178
4179                 if (ops->ndo_fdb_del)
4180                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
4181
4182                 if (err)
4183                         goto out;
4184                 else
4185                         ndm->ndm_flags &= ~NTF_MASTER;
4186         }
4187
4188         /* Embedded bridge, macvlan, and any other device support */
4189         if (ndm->ndm_flags & NTF_SELF) {
4190                 if (dev->netdev_ops->ndo_fdb_del)
4191                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
4192                                                            vid);
4193                 else
4194                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
4195
4196                 if (!err) {
4197                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
4198                                         ndm->ndm_state);
4199                         ndm->ndm_flags &= ~NTF_SELF;
4200                 }
4201         }
4202 out:
4203         return err;
4204 }
4205
4206 static int nlmsg_populate_fdb(struct sk_buff *skb,
4207                               struct netlink_callback *cb,
4208                               struct net_device *dev,
4209                               int *idx,
4210                               struct netdev_hw_addr_list *list)
4211 {
4212         struct netdev_hw_addr *ha;
4213         int err;
4214         u32 portid, seq;
4215
4216         portid = NETLINK_CB(cb->skb).portid;
4217         seq = cb->nlh->nlmsg_seq;
4218
4219         list_for_each_entry(ha, &list->list, list) {
4220                 if (*idx < cb->args[2])
4221                         goto skip;
4222
4223                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
4224                                               portid, seq,
4225                                               RTM_NEWNEIGH, NTF_SELF,
4226                                               NLM_F_MULTI, NUD_PERMANENT);
4227                 if (err < 0)
4228                         return err;
4229 skip:
4230                 *idx += 1;
4231         }
4232         return 0;
4233 }
4234
4235 /**
4236  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
4237  * @skb: socket buffer to store message in
4238  * @cb: netlink callback
4239  * @dev: netdevice
4240  * @filter_dev: ignored
4241  * @idx: the number of FDB table entries dumped is added to *@idx
4242  *
4243  * Default netdevice operation to dump the existing unicast address list.
4244  * Returns number of addresses from list put in skb.
4245  */
4246 int ndo_dflt_fdb_dump(struct sk_buff *skb,
4247                       struct netlink_callback *cb,
4248                       struct net_device *dev,
4249                       struct net_device *filter_dev,
4250                       int *idx)
4251 {
4252         int err;
4253
4254         if (dev->type != ARPHRD_ETHER)
4255                 return -EINVAL;
4256
4257         netif_addr_lock_bh(dev);
4258         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
4259         if (err)
4260                 goto out;
4261         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
4262 out:
4263         netif_addr_unlock_bh(dev);
4264         return err;
4265 }
4266 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
4267
4268 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
4269                                  int *br_idx, int *brport_idx,
4270                                  struct netlink_ext_ack *extack)
4271 {
4272         struct nlattr *tb[NDA_MAX + 1];
4273         struct ndmsg *ndm;
4274         int err, i;
4275
4276         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4277                 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
4278                 return -EINVAL;
4279         }
4280
4281         ndm = nlmsg_data(nlh);
4282         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4283             ndm->ndm_flags || ndm->ndm_type) {
4284                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
4285                 return -EINVAL;
4286         }
4287
4288         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4289                                             NDA_MAX, NULL, extack);
4290         if (err < 0)
4291                 return err;
4292
4293         *brport_idx = ndm->ndm_ifindex;
4294         for (i = 0; i <= NDA_MAX; ++i) {
4295                 if (!tb[i])
4296                         continue;
4297
4298                 switch (i) {
4299                 case NDA_IFINDEX:
4300                         if (nla_len(tb[i]) != sizeof(u32)) {
4301                                 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
4302                                 return -EINVAL;
4303                         }
4304                         *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
4305                         break;
4306                 case NDA_MASTER:
4307                         if (nla_len(tb[i]) != sizeof(u32)) {
4308                                 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
4309                                 return -EINVAL;
4310                         }
4311                         *br_idx = nla_get_u32(tb[NDA_MASTER]);
4312                         break;
4313                 default:
4314                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
4315                         return -EINVAL;
4316                 }
4317         }
4318
4319         return 0;
4320 }
4321
4322 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
4323                                  int *br_idx, int *brport_idx,
4324                                  struct netlink_ext_ack *extack)
4325 {
4326         struct nlattr *tb[IFLA_MAX+1];
4327         int err;
4328
4329         /* A hack to preserve kernel<->userspace interface.
4330          * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
4331          * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
4332          * So, check for ndmsg with an optional u32 attribute (not used here).
4333          * Fortunately these sizes don't conflict with the size of ifinfomsg
4334          * with an optional attribute.
4335          */
4336         if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
4337             (nlmsg_len(nlh) != sizeof(struct ndmsg) +
4338              nla_attr_size(sizeof(u32)))) {
4339                 struct ifinfomsg *ifm;
4340
4341                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4342                                              tb, IFLA_MAX, ifla_policy,
4343                                              extack);
4344                 if (err < 0) {
4345                         return -EINVAL;
4346                 } else if (err == 0) {
4347                         if (tb[IFLA_MASTER])
4348                                 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
4349                 }
4350
4351                 ifm = nlmsg_data(nlh);
4352                 *brport_idx = ifm->ifi_index;
4353         }
4354         return 0;
4355 }
4356
4357 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
4358 {
4359         struct net_device *dev;
4360         struct net_device *br_dev = NULL;
4361         const struct net_device_ops *ops = NULL;
4362         const struct net_device_ops *cops = NULL;
4363         struct net *net = sock_net(skb->sk);
4364         struct hlist_head *head;
4365         int brport_idx = 0;
4366         int br_idx = 0;
4367         int h, s_h;
4368         int idx = 0, s_idx;
4369         int err = 0;
4370         int fidx = 0;
4371
4372         if (cb->strict_check)
4373                 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4374                                             cb->extack);
4375         else
4376                 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4377                                             cb->extack);
4378         if (err < 0)
4379                 return err;
4380
4381         if (br_idx) {
4382                 br_dev = __dev_get_by_index(net, br_idx);
4383                 if (!br_dev)
4384                         return -ENODEV;
4385
4386                 ops = br_dev->netdev_ops;
4387         }
4388
4389         s_h = cb->args[0];
4390         s_idx = cb->args[1];
4391
4392         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4393                 idx = 0;
4394                 head = &net->dev_index_head[h];
4395                 hlist_for_each_entry(dev, head, index_hlist) {
4396
4397                         if (brport_idx && (dev->ifindex != brport_idx))
4398                                 continue;
4399
4400                         if (!br_idx) { /* user did not specify a specific bridge */
4401                                 if (netif_is_bridge_port(dev)) {
4402                                         br_dev = netdev_master_upper_dev_get(dev);
4403                                         cops = br_dev->netdev_ops;
4404                                 }
4405                         } else {
4406                                 if (dev != br_dev &&
4407                                     !netif_is_bridge_port(dev))
4408                                         continue;
4409
4410                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
4411                                     !netif_is_bridge_master(dev))
4412                                         continue;
4413                                 cops = ops;
4414                         }
4415
4416                         if (idx < s_idx)
4417                                 goto cont;
4418
4419                         if (netif_is_bridge_port(dev)) {
4420                                 if (cops && cops->ndo_fdb_dump) {
4421                                         err = cops->ndo_fdb_dump(skb, cb,
4422                                                                 br_dev, dev,
4423                                                                 &fidx);
4424                                         if (err == -EMSGSIZE)
4425                                                 goto out;
4426                                 }
4427                         }
4428
4429                         if (dev->netdev_ops->ndo_fdb_dump)
4430                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4431                                                                     dev, NULL,
4432                                                                     &fidx);
4433                         else
4434                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4435                                                         &fidx);
4436                         if (err == -EMSGSIZE)
4437                                 goto out;
4438
4439                         cops = NULL;
4440
4441                         /* reset fdb offset to 0 for rest of the interfaces */
4442                         cb->args[2] = 0;
4443                         fidx = 0;
4444 cont:
4445                         idx++;
4446                 }
4447         }
4448
4449 out:
4450         cb->args[0] = h;
4451         cb->args[1] = idx;
4452         cb->args[2] = fidx;
4453
4454         return skb->len;
4455 }
4456
4457 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4458                                 struct nlattr **tb, u8 *ndm_flags,
4459                                 int *br_idx, int *brport_idx, u8 **addr,
4460                                 u16 *vid, struct netlink_ext_ack *extack)
4461 {
4462         struct ndmsg *ndm;
4463         int err, i;
4464
4465         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4466                 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4467                 return -EINVAL;
4468         }
4469
4470         ndm = nlmsg_data(nlh);
4471         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4472             ndm->ndm_type) {
4473                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4474                 return -EINVAL;
4475         }
4476
4477         if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4478                 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4479                 return -EINVAL;
4480         }
4481
4482         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4483                                             NDA_MAX, nda_policy, extack);
4484         if (err < 0)
4485                 return err;
4486
4487         *ndm_flags = ndm->ndm_flags;
4488         *brport_idx = ndm->ndm_ifindex;
4489         for (i = 0; i <= NDA_MAX; ++i) {
4490                 if (!tb[i])
4491                         continue;
4492
4493                 switch (i) {
4494                 case NDA_MASTER:
4495                         *br_idx = nla_get_u32(tb[i]);
4496                         break;
4497                 case NDA_LLADDR:
4498                         if (nla_len(tb[i]) != ETH_ALEN) {
4499                                 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4500                                 return -EINVAL;
4501                         }
4502                         *addr = nla_data(tb[i]);
4503                         break;
4504                 case NDA_VLAN:
4505                         err = fdb_vid_parse(tb[i], vid, extack);
4506                         if (err)
4507                                 return err;
4508                         break;
4509                 case NDA_VNI:
4510                         break;
4511                 default:
4512                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4513                         return -EINVAL;
4514                 }
4515         }
4516
4517         return 0;
4518 }
4519
4520 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4521                         struct netlink_ext_ack *extack)
4522 {
4523         struct net_device *dev = NULL, *br_dev = NULL;
4524         const struct net_device_ops *ops = NULL;
4525         struct net *net = sock_net(in_skb->sk);
4526         struct nlattr *tb[NDA_MAX + 1];
4527         struct sk_buff *skb;
4528         int brport_idx = 0;
4529         u8 ndm_flags = 0;
4530         int br_idx = 0;
4531         u8 *addr = NULL;
4532         u16 vid = 0;
4533         int err;
4534
4535         err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4536                                    &brport_idx, &addr, &vid, extack);
4537         if (err < 0)
4538                 return err;
4539
4540         if (!addr) {
4541                 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4542                 return -EINVAL;
4543         }
4544
4545         if (brport_idx) {
4546                 dev = __dev_get_by_index(net, brport_idx);
4547                 if (!dev) {
4548                         NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4549                         return -ENODEV;
4550                 }
4551         }
4552
4553         if (br_idx) {
4554                 if (dev) {
4555                         NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4556                         return -EINVAL;
4557                 }
4558
4559                 br_dev = __dev_get_by_index(net, br_idx);
4560                 if (!br_dev) {
4561                         NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4562                         return -EINVAL;
4563                 }
4564                 ops = br_dev->netdev_ops;
4565         }
4566
4567         if (dev) {
4568                 if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4569                         if (!netif_is_bridge_port(dev)) {
4570                                 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4571                                 return -EINVAL;
4572                         }
4573                         br_dev = netdev_master_upper_dev_get(dev);
4574                         if (!br_dev) {
4575                                 NL_SET_ERR_MSG(extack, "Master of device not found");
4576                                 return -EINVAL;
4577                         }
4578                         ops = br_dev->netdev_ops;
4579                 } else {
4580                         if (!(ndm_flags & NTF_SELF)) {
4581                                 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4582                                 return -EINVAL;
4583                         }
4584                         ops = dev->netdev_ops;
4585                 }
4586         }
4587
4588         if (!br_dev && !dev) {
4589                 NL_SET_ERR_MSG(extack, "No device specified");
4590                 return -ENODEV;
4591         }
4592
4593         if (!ops || !ops->ndo_fdb_get) {
4594                 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4595                 return -EOPNOTSUPP;
4596         }
4597
4598         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4599         if (!skb)
4600                 return -ENOBUFS;
4601
4602         if (br_dev)
4603                 dev = br_dev;
4604         err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4605                                NETLINK_CB(in_skb).portid,
4606                                nlh->nlmsg_seq, extack);
4607         if (err)
4608                 goto out;
4609
4610         return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4611 out:
4612         kfree_skb(skb);
4613         return err;
4614 }
4615
4616 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4617                                unsigned int attrnum, unsigned int flag)
4618 {
4619         if (mask & flag)
4620                 return nla_put_u8(skb, attrnum, !!(flags & flag));
4621         return 0;
4622 }
4623
4624 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4625                             struct net_device *dev, u16 mode,
4626                             u32 flags, u32 mask, int nlflags,
4627                             u32 filter_mask,
4628                             int (*vlan_fill)(struct sk_buff *skb,
4629                                              struct net_device *dev,
4630                                              u32 filter_mask))
4631 {
4632         struct nlmsghdr *nlh;
4633         struct ifinfomsg *ifm;
4634         struct nlattr *br_afspec;
4635         struct nlattr *protinfo;
4636         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4637         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4638         int err = 0;
4639
4640         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4641         if (nlh == NULL)
4642                 return -EMSGSIZE;
4643
4644         ifm = nlmsg_data(nlh);
4645         ifm->ifi_family = AF_BRIDGE;
4646         ifm->__ifi_pad = 0;
4647         ifm->ifi_type = dev->type;
4648         ifm->ifi_index = dev->ifindex;
4649         ifm->ifi_flags = dev_get_flags(dev);
4650         ifm->ifi_change = 0;
4651
4652
4653         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4654             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4655             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4656             (br_dev &&
4657              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4658             (dev->addr_len &&
4659              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4660             (dev->ifindex != dev_get_iflink(dev) &&
4661              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4662                 goto nla_put_failure;
4663
4664         br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4665         if (!br_afspec)
4666                 goto nla_put_failure;
4667
4668         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4669                 nla_nest_cancel(skb, br_afspec);
4670                 goto nla_put_failure;
4671         }
4672
4673         if (mode != BRIDGE_MODE_UNDEF) {
4674                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4675                         nla_nest_cancel(skb, br_afspec);
4676                         goto nla_put_failure;
4677                 }
4678         }
4679         if (vlan_fill) {
4680                 err = vlan_fill(skb, dev, filter_mask);
4681                 if (err) {
4682                         nla_nest_cancel(skb, br_afspec);
4683                         goto nla_put_failure;
4684                 }
4685         }
4686         nla_nest_end(skb, br_afspec);
4687
4688         protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4689         if (!protinfo)
4690                 goto nla_put_failure;
4691
4692         if (brport_nla_put_flag(skb, flags, mask,
4693                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4694             brport_nla_put_flag(skb, flags, mask,
4695                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4696             brport_nla_put_flag(skb, flags, mask,
4697                                 IFLA_BRPORT_FAST_LEAVE,
4698                                 BR_MULTICAST_FAST_LEAVE) ||
4699             brport_nla_put_flag(skb, flags, mask,
4700                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4701             brport_nla_put_flag(skb, flags, mask,
4702                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4703             brport_nla_put_flag(skb, flags, mask,
4704                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4705             brport_nla_put_flag(skb, flags, mask,
4706                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4707             brport_nla_put_flag(skb, flags, mask,
4708                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP) ||
4709             brport_nla_put_flag(skb, flags, mask,
4710                                 IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) ||
4711             brport_nla_put_flag(skb, flags, mask,
4712                                 IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) {
4713                 nla_nest_cancel(skb, protinfo);
4714                 goto nla_put_failure;
4715         }
4716
4717         nla_nest_end(skb, protinfo);
4718
4719         nlmsg_end(skb, nlh);
4720         return 0;
4721 nla_put_failure:
4722         nlmsg_cancel(skb, nlh);
4723         return err ? err : -EMSGSIZE;
4724 }
4725 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4726
4727 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4728                                     bool strict_check, u32 *filter_mask,
4729                                     struct netlink_ext_ack *extack)
4730 {
4731         struct nlattr *tb[IFLA_MAX+1];
4732         int err, i;
4733
4734         if (strict_check) {
4735                 struct ifinfomsg *ifm;
4736
4737                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4738                         NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4739                         return -EINVAL;
4740                 }
4741
4742                 ifm = nlmsg_data(nlh);
4743                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4744                     ifm->ifi_change || ifm->ifi_index) {
4745                         NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4746                         return -EINVAL;
4747                 }
4748
4749                 err = nlmsg_parse_deprecated_strict(nlh,
4750                                                     sizeof(struct ifinfomsg),
4751                                                     tb, IFLA_MAX, ifla_policy,
4752                                                     extack);
4753         } else {
4754                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4755                                              tb, IFLA_MAX, ifla_policy,
4756                                              extack);
4757         }
4758         if (err < 0)
4759                 return err;
4760
4761         /* new attributes should only be added with strict checking */
4762         for (i = 0; i <= IFLA_MAX; ++i) {
4763                 if (!tb[i])
4764                         continue;
4765
4766                 switch (i) {
4767                 case IFLA_EXT_MASK:
4768                         *filter_mask = nla_get_u32(tb[i]);
4769                         break;
4770                 default:
4771                         if (strict_check) {
4772                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4773                                 return -EINVAL;
4774                         }
4775                 }
4776         }
4777
4778         return 0;
4779 }
4780
4781 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4782 {
4783         const struct nlmsghdr *nlh = cb->nlh;
4784         struct net *net = sock_net(skb->sk);
4785         struct net_device *dev;
4786         int idx = 0;
4787         u32 portid = NETLINK_CB(cb->skb).portid;
4788         u32 seq = nlh->nlmsg_seq;
4789         u32 filter_mask = 0;
4790         int err;
4791
4792         err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4793                                        cb->extack);
4794         if (err < 0 && cb->strict_check)
4795                 return err;
4796
4797         rcu_read_lock();
4798         for_each_netdev_rcu(net, dev) {
4799                 const struct net_device_ops *ops = dev->netdev_ops;
4800                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4801
4802                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4803                         if (idx >= cb->args[0]) {
4804                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
4805                                                 skb, portid, seq, dev,
4806                                                 filter_mask, NLM_F_MULTI);
4807                                 if (err < 0 && err != -EOPNOTSUPP) {
4808                                         if (likely(skb->len))
4809                                                 break;
4810
4811                                         goto out_err;
4812                                 }
4813                         }
4814                         idx++;
4815                 }
4816
4817                 if (ops->ndo_bridge_getlink) {
4818                         if (idx >= cb->args[0]) {
4819                                 err = ops->ndo_bridge_getlink(skb, portid,
4820                                                               seq, dev,
4821                                                               filter_mask,
4822                                                               NLM_F_MULTI);
4823                                 if (err < 0 && err != -EOPNOTSUPP) {
4824                                         if (likely(skb->len))
4825                                                 break;
4826
4827                                         goto out_err;
4828                                 }
4829                         }
4830                         idx++;
4831                 }
4832         }
4833         err = skb->len;
4834 out_err:
4835         rcu_read_unlock();
4836         cb->args[0] = idx;
4837
4838         return err;
4839 }
4840
4841 static inline size_t bridge_nlmsg_size(void)
4842 {
4843         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4844                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
4845                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
4846                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
4847                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
4848                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
4849                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
4850                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
4851                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
4852                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
4853                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
4854 }
4855
4856 static int rtnl_bridge_notify(struct net_device *dev)
4857 {
4858         struct net *net = dev_net(dev);
4859         struct sk_buff *skb;
4860         int err = -EOPNOTSUPP;
4861
4862         if (!dev->netdev_ops->ndo_bridge_getlink)
4863                 return 0;
4864
4865         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4866         if (!skb) {
4867                 err = -ENOMEM;
4868                 goto errout;
4869         }
4870
4871         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4872         if (err < 0)
4873                 goto errout;
4874
4875         /* Notification info is only filled for bridge ports, not the bridge
4876          * device itself. Therefore, a zero notification length is valid and
4877          * should not result in an error.
4878          */
4879         if (!skb->len)
4880                 goto errout;
4881
4882         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4883         return 0;
4884 errout:
4885         WARN_ON(err == -EMSGSIZE);
4886         kfree_skb(skb);
4887         if (err)
4888                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4889         return err;
4890 }
4891
4892 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4893                                struct netlink_ext_ack *extack)
4894 {
4895         struct net *net = sock_net(skb->sk);
4896         struct ifinfomsg *ifm;
4897         struct net_device *dev;
4898         struct nlattr *br_spec, *attr = NULL;
4899         int rem, err = -EOPNOTSUPP;
4900         u16 flags = 0;
4901         bool have_flags = false;
4902
4903         if (nlmsg_len(nlh) < sizeof(*ifm))
4904                 return -EINVAL;
4905
4906         ifm = nlmsg_data(nlh);
4907         if (ifm->ifi_family != AF_BRIDGE)
4908                 return -EPFNOSUPPORT;
4909
4910         dev = __dev_get_by_index(net, ifm->ifi_index);
4911         if (!dev) {
4912                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4913                 return -ENODEV;
4914         }
4915
4916         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4917         if (br_spec) {
4918                 nla_for_each_nested(attr, br_spec, rem) {
4919                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4920                                 if (nla_len(attr) < sizeof(flags))
4921                                         return -EINVAL;
4922
4923                                 have_flags = true;
4924                                 flags = nla_get_u16(attr);
4925                                 break;
4926                         }
4927                 }
4928         }
4929
4930         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4931                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4932
4933                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4934                         err = -EOPNOTSUPP;
4935                         goto out;
4936                 }
4937
4938                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
4939                                                              extack);
4940                 if (err)
4941                         goto out;
4942
4943                 flags &= ~BRIDGE_FLAGS_MASTER;
4944         }
4945
4946         if ((flags & BRIDGE_FLAGS_SELF)) {
4947                 if (!dev->netdev_ops->ndo_bridge_setlink)
4948                         err = -EOPNOTSUPP;
4949                 else
4950                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4951                                                                   flags,
4952                                                                   extack);
4953                 if (!err) {
4954                         flags &= ~BRIDGE_FLAGS_SELF;
4955
4956                         /* Generate event to notify upper layer of bridge
4957                          * change
4958                          */
4959                         err = rtnl_bridge_notify(dev);
4960                 }
4961         }
4962
4963         if (have_flags)
4964                 memcpy(nla_data(attr), &flags, sizeof(flags));
4965 out:
4966         return err;
4967 }
4968
4969 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4970                                struct netlink_ext_ack *extack)
4971 {
4972         struct net *net = sock_net(skb->sk);
4973         struct ifinfomsg *ifm;
4974         struct net_device *dev;
4975         struct nlattr *br_spec, *attr = NULL;
4976         int rem, err = -EOPNOTSUPP;
4977         u16 flags = 0;
4978         bool have_flags = false;
4979
4980         if (nlmsg_len(nlh) < sizeof(*ifm))
4981                 return -EINVAL;
4982
4983         ifm = nlmsg_data(nlh);
4984         if (ifm->ifi_family != AF_BRIDGE)
4985                 return -EPFNOSUPPORT;
4986
4987         dev = __dev_get_by_index(net, ifm->ifi_index);
4988         if (!dev) {
4989                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4990                 return -ENODEV;
4991         }
4992
4993         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4994         if (br_spec) {
4995                 nla_for_each_nested(attr, br_spec, rem) {
4996                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4997                                 if (nla_len(attr) < sizeof(flags))
4998                                         return -EINVAL;
4999
5000                                 have_flags = true;
5001                                 flags = nla_get_u16(attr);
5002                                 break;
5003                         }
5004                 }
5005         }
5006
5007         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
5008                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
5009
5010                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
5011                         err = -EOPNOTSUPP;
5012                         goto out;
5013                 }
5014
5015                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
5016                 if (err)
5017                         goto out;
5018
5019                 flags &= ~BRIDGE_FLAGS_MASTER;
5020         }
5021
5022         if ((flags & BRIDGE_FLAGS_SELF)) {
5023                 if (!dev->netdev_ops->ndo_bridge_dellink)
5024                         err = -EOPNOTSUPP;
5025                 else
5026                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
5027                                                                   flags);
5028
5029                 if (!err) {
5030                         flags &= ~BRIDGE_FLAGS_SELF;
5031
5032                         /* Generate event to notify upper layer of bridge
5033                          * change
5034                          */
5035                         err = rtnl_bridge_notify(dev);
5036                 }
5037         }
5038
5039         if (have_flags)
5040                 memcpy(nla_data(attr), &flags, sizeof(flags));
5041 out:
5042         return err;
5043 }
5044
5045 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
5046 {
5047         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
5048                (!idxattr || idxattr == attrid);
5049 }
5050
5051 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
5052 static int rtnl_get_offload_stats_attr_size(int attr_id)
5053 {
5054         switch (attr_id) {
5055         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
5056                 return sizeof(struct rtnl_link_stats64);
5057         }
5058
5059         return 0;
5060 }
5061
5062 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
5063                                   int *prividx)
5064 {
5065         struct nlattr *attr = NULL;
5066         int attr_id, size;
5067         void *attr_data;
5068         int err;
5069
5070         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
5071               dev->netdev_ops->ndo_get_offload_stats))
5072                 return -ENODATA;
5073
5074         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
5075              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
5076                 if (attr_id < *prividx)
5077                         continue;
5078
5079                 size = rtnl_get_offload_stats_attr_size(attr_id);
5080                 if (!size)
5081                         continue;
5082
5083                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
5084                         continue;
5085
5086                 attr = nla_reserve_64bit(skb, attr_id, size,
5087                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
5088                 if (!attr)
5089                         goto nla_put_failure;
5090
5091                 attr_data = nla_data(attr);
5092                 memset(attr_data, 0, size);
5093                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
5094                                                              attr_data);
5095                 if (err)
5096                         goto get_offload_stats_failure;
5097         }
5098
5099         if (!attr)
5100                 return -ENODATA;
5101
5102         *prividx = 0;
5103         return 0;
5104
5105 nla_put_failure:
5106         err = -EMSGSIZE;
5107 get_offload_stats_failure:
5108         *prividx = attr_id;
5109         return err;
5110 }
5111
5112 static int rtnl_get_offload_stats_size(const struct net_device *dev)
5113 {
5114         int nla_size = 0;
5115         int attr_id;
5116         int size;
5117
5118         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
5119               dev->netdev_ops->ndo_get_offload_stats))
5120                 return 0;
5121
5122         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
5123              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
5124                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
5125                         continue;
5126                 size = rtnl_get_offload_stats_attr_size(attr_id);
5127                 nla_size += nla_total_size_64bit(size);
5128         }
5129
5130         if (nla_size != 0)
5131                 nla_size += nla_total_size(0);
5132
5133         return nla_size;
5134 }
5135
5136 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
5137                                int type, u32 pid, u32 seq, u32 change,
5138                                unsigned int flags, unsigned int filter_mask,
5139                                int *idxattr, int *prividx)
5140 {
5141         struct if_stats_msg *ifsm;
5142         struct nlmsghdr *nlh;
5143         struct nlattr *attr;
5144         int s_prividx = *prividx;
5145         int err;
5146
5147         ASSERT_RTNL();
5148
5149         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
5150         if (!nlh)
5151                 return -EMSGSIZE;
5152
5153         ifsm = nlmsg_data(nlh);
5154         ifsm->family = PF_UNSPEC;
5155         ifsm->pad1 = 0;
5156         ifsm->pad2 = 0;
5157         ifsm->ifindex = dev->ifindex;
5158         ifsm->filter_mask = filter_mask;
5159
5160         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
5161                 struct rtnl_link_stats64 *sp;
5162
5163                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
5164                                          sizeof(struct rtnl_link_stats64),
5165                                          IFLA_STATS_UNSPEC);
5166                 if (!attr)
5167                         goto nla_put_failure;
5168
5169                 sp = nla_data(attr);
5170                 dev_get_stats(dev, sp);
5171         }
5172
5173         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
5174                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5175
5176                 if (ops && ops->fill_linkxstats) {
5177                         *idxattr = IFLA_STATS_LINK_XSTATS;
5178                         attr = nla_nest_start_noflag(skb,
5179                                                      IFLA_STATS_LINK_XSTATS);
5180                         if (!attr)
5181                                 goto nla_put_failure;
5182
5183                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5184                         nla_nest_end(skb, attr);
5185                         if (err)
5186                                 goto nla_put_failure;
5187                         *idxattr = 0;
5188                 }
5189         }
5190
5191         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
5192                              *idxattr)) {
5193                 const struct rtnl_link_ops *ops = NULL;
5194                 const struct net_device *master;
5195
5196                 master = netdev_master_upper_dev_get(dev);
5197                 if (master)
5198                         ops = master->rtnl_link_ops;
5199                 if (ops && ops->fill_linkxstats) {
5200                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
5201                         attr = nla_nest_start_noflag(skb,
5202                                                      IFLA_STATS_LINK_XSTATS_SLAVE);
5203                         if (!attr)
5204                                 goto nla_put_failure;
5205
5206                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5207                         nla_nest_end(skb, attr);
5208                         if (err)
5209                                 goto nla_put_failure;
5210                         *idxattr = 0;
5211                 }
5212         }
5213
5214         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
5215                              *idxattr)) {
5216                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
5217                 attr = nla_nest_start_noflag(skb,
5218                                              IFLA_STATS_LINK_OFFLOAD_XSTATS);
5219                 if (!attr)
5220                         goto nla_put_failure;
5221
5222                 err = rtnl_get_offload_stats(skb, dev, prividx);
5223                 if (err == -ENODATA)
5224                         nla_nest_cancel(skb, attr);
5225                 else
5226                         nla_nest_end(skb, attr);
5227
5228                 if (err && err != -ENODATA)
5229                         goto nla_put_failure;
5230                 *idxattr = 0;
5231         }
5232
5233         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
5234                 struct rtnl_af_ops *af_ops;
5235
5236                 *idxattr = IFLA_STATS_AF_SPEC;
5237                 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
5238                 if (!attr)
5239                         goto nla_put_failure;
5240
5241                 rcu_read_lock();
5242                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5243                         if (af_ops->fill_stats_af) {
5244                                 struct nlattr *af;
5245                                 int err;
5246
5247                                 af = nla_nest_start_noflag(skb,
5248                                                            af_ops->family);
5249                                 if (!af) {
5250                                         rcu_read_unlock();
5251                                         goto nla_put_failure;
5252                                 }
5253                                 err = af_ops->fill_stats_af(skb, dev);
5254
5255                                 if (err == -ENODATA) {
5256                                         nla_nest_cancel(skb, af);
5257                                 } else if (err < 0) {
5258                                         rcu_read_unlock();
5259                                         goto nla_put_failure;
5260                                 }
5261
5262                                 nla_nest_end(skb, af);
5263                         }
5264                 }
5265                 rcu_read_unlock();
5266
5267                 nla_nest_end(skb, attr);
5268
5269                 *idxattr = 0;
5270         }
5271
5272         nlmsg_end(skb, nlh);
5273
5274         return 0;
5275
5276 nla_put_failure:
5277         /* not a multi message or no progress mean a real error */
5278         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
5279                 nlmsg_cancel(skb, nlh);
5280         else
5281                 nlmsg_end(skb, nlh);
5282
5283         return -EMSGSIZE;
5284 }
5285
5286 static size_t if_nlmsg_stats_size(const struct net_device *dev,
5287                                   u32 filter_mask)
5288 {
5289         size_t size = NLMSG_ALIGN(sizeof(struct if_stats_msg));
5290
5291         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
5292                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
5293
5294         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
5295                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5296                 int attr = IFLA_STATS_LINK_XSTATS;
5297
5298                 if (ops && ops->get_linkxstats_size) {
5299                         size += nla_total_size(ops->get_linkxstats_size(dev,
5300                                                                         attr));
5301                         /* for IFLA_STATS_LINK_XSTATS */
5302                         size += nla_total_size(0);
5303                 }
5304         }
5305
5306         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
5307                 struct net_device *_dev = (struct net_device *)dev;
5308                 const struct rtnl_link_ops *ops = NULL;
5309                 const struct net_device *master;
5310
5311                 /* netdev_master_upper_dev_get can't take const */
5312                 master = netdev_master_upper_dev_get(_dev);
5313                 if (master)
5314                         ops = master->rtnl_link_ops;
5315                 if (ops && ops->get_linkxstats_size) {
5316                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
5317
5318                         size += nla_total_size(ops->get_linkxstats_size(dev,
5319                                                                         attr));
5320                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
5321                         size += nla_total_size(0);
5322                 }
5323         }
5324
5325         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
5326                 size += rtnl_get_offload_stats_size(dev);
5327
5328         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
5329                 struct rtnl_af_ops *af_ops;
5330
5331                 /* for IFLA_STATS_AF_SPEC */
5332                 size += nla_total_size(0);
5333
5334                 rcu_read_lock();
5335                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5336                         if (af_ops->get_stats_af_size) {
5337                                 size += nla_total_size(
5338                                         af_ops->get_stats_af_size(dev));
5339
5340                                 /* for AF_* */
5341                                 size += nla_total_size(0);
5342                         }
5343                 }
5344                 rcu_read_unlock();
5345         }
5346
5347         return size;
5348 }
5349
5350 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
5351                                 bool is_dump, struct netlink_ext_ack *extack)
5352 {
5353         struct if_stats_msg *ifsm;
5354
5355         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
5356                 NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
5357                 return -EINVAL;
5358         }
5359
5360         if (!strict_check)
5361                 return 0;
5362
5363         ifsm = nlmsg_data(nlh);
5364
5365         /* only requests using strict checks can pass data to influence
5366          * the dump. The legacy exception is filter_mask.
5367          */
5368         if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
5369                 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
5370                 return -EINVAL;
5371         }
5372         if (nlmsg_attrlen(nlh, sizeof(*ifsm))) {
5373                 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
5374                 return -EINVAL;
5375         }
5376         if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5377                 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5378                 return -EINVAL;
5379         }
5380
5381         return 0;
5382 }
5383
5384 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5385                           struct netlink_ext_ack *extack)
5386 {
5387         struct net *net = sock_net(skb->sk);
5388         struct net_device *dev = NULL;
5389         int idxattr = 0, prividx = 0;
5390         struct if_stats_msg *ifsm;
5391         struct sk_buff *nskb;
5392         u32 filter_mask;
5393         int err;
5394
5395         err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5396                                    false, extack);
5397         if (err)
5398                 return err;
5399
5400         ifsm = nlmsg_data(nlh);
5401         if (ifsm->ifindex > 0)
5402                 dev = __dev_get_by_index(net, ifsm->ifindex);
5403         else
5404                 return -EINVAL;
5405
5406         if (!dev)
5407                 return -ENODEV;
5408
5409         filter_mask = ifsm->filter_mask;
5410         if (!filter_mask)
5411                 return -EINVAL;
5412
5413         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
5414         if (!nskb)
5415                 return -ENOBUFS;
5416
5417         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5418                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5419                                   0, filter_mask, &idxattr, &prividx);
5420         if (err < 0) {
5421                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5422                 WARN_ON(err == -EMSGSIZE);
5423                 kfree_skb(nskb);
5424         } else {
5425                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5426         }
5427
5428         return err;
5429 }
5430
5431 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5432 {
5433         struct netlink_ext_ack *extack = cb->extack;
5434         int h, s_h, err, s_idx, s_idxattr, s_prividx;
5435         struct net *net = sock_net(skb->sk);
5436         unsigned int flags = NLM_F_MULTI;
5437         struct if_stats_msg *ifsm;
5438         struct hlist_head *head;
5439         struct net_device *dev;
5440         u32 filter_mask = 0;
5441         int idx = 0;
5442
5443         s_h = cb->args[0];
5444         s_idx = cb->args[1];
5445         s_idxattr = cb->args[2];
5446         s_prividx = cb->args[3];
5447
5448         cb->seq = net->dev_base_seq;
5449
5450         err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5451         if (err)
5452                 return err;
5453
5454         ifsm = nlmsg_data(cb->nlh);
5455         filter_mask = ifsm->filter_mask;
5456         if (!filter_mask) {
5457                 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5458                 return -EINVAL;
5459         }
5460
5461         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5462                 idx = 0;
5463                 head = &net->dev_index_head[h];
5464                 hlist_for_each_entry(dev, head, index_hlist) {
5465                         if (idx < s_idx)
5466                                 goto cont;
5467                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5468                                                   NETLINK_CB(cb->skb).portid,
5469                                                   cb->nlh->nlmsg_seq, 0,
5470                                                   flags, filter_mask,
5471                                                   &s_idxattr, &s_prividx);
5472                         /* If we ran out of room on the first message,
5473                          * we're in trouble
5474                          */
5475                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5476
5477                         if (err < 0)
5478                                 goto out;
5479                         s_prividx = 0;
5480                         s_idxattr = 0;
5481                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5482 cont:
5483                         idx++;
5484                 }
5485         }
5486 out:
5487         cb->args[3] = s_prividx;
5488         cb->args[2] = s_idxattr;
5489         cb->args[1] = idx;
5490         cb->args[0] = h;
5491
5492         return skb->len;
5493 }
5494
5495 /* Process one rtnetlink message. */
5496
5497 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5498                              struct netlink_ext_ack *extack)
5499 {
5500         struct net *net = sock_net(skb->sk);
5501         struct rtnl_link *link;
5502         struct module *owner;
5503         int err = -EOPNOTSUPP;
5504         rtnl_doit_func doit;
5505         unsigned int flags;
5506         int kind;
5507         int family;
5508         int type;
5509
5510         type = nlh->nlmsg_type;
5511         if (type > RTM_MAX)
5512                 return -EOPNOTSUPP;
5513
5514         type -= RTM_BASE;
5515
5516         /* All the messages must have at least 1 byte length */
5517         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
5518                 return 0;
5519
5520         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
5521         kind = type&3;
5522
5523         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
5524                 return -EPERM;
5525
5526         rcu_read_lock();
5527         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
5528                 struct sock *rtnl;
5529                 rtnl_dumpit_func dumpit;
5530                 u32 min_dump_alloc = 0;
5531
5532                 link = rtnl_get_link(family, type);
5533                 if (!link || !link->dumpit) {
5534                         family = PF_UNSPEC;
5535                         link = rtnl_get_link(family, type);
5536                         if (!link || !link->dumpit)
5537                                 goto err_unlock;
5538                 }
5539                 owner = link->owner;
5540                 dumpit = link->dumpit;
5541
5542                 if (type == RTM_GETLINK - RTM_BASE)
5543                         min_dump_alloc = rtnl_calcit(skb, nlh);
5544
5545                 err = 0;
5546                 /* need to do this before rcu_read_unlock() */
5547                 if (!try_module_get(owner))
5548                         err = -EPROTONOSUPPORT;
5549
5550                 rcu_read_unlock();
5551
5552                 rtnl = net->rtnl;
5553                 if (err == 0) {
5554                         struct netlink_dump_control c = {
5555                                 .dump           = dumpit,
5556                                 .min_dump_alloc = min_dump_alloc,
5557                                 .module         = owner,
5558                         };
5559                         err = netlink_dump_start(rtnl, skb, nlh, &c);
5560                         /* netlink_dump_start() will keep a reference on
5561                          * module if dump is still in progress.
5562                          */
5563                         module_put(owner);
5564                 }
5565                 return err;
5566         }
5567
5568         link = rtnl_get_link(family, type);
5569         if (!link || !link->doit) {
5570                 family = PF_UNSPEC;
5571                 link = rtnl_get_link(PF_UNSPEC, type);
5572                 if (!link || !link->doit)
5573                         goto out_unlock;
5574         }
5575
5576         owner = link->owner;
5577         if (!try_module_get(owner)) {
5578                 err = -EPROTONOSUPPORT;
5579                 goto out_unlock;
5580         }
5581
5582         flags = link->flags;
5583         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
5584                 doit = link->doit;
5585                 rcu_read_unlock();
5586                 if (doit)
5587                         err = doit(skb, nlh, extack);
5588                 module_put(owner);
5589                 return err;
5590         }
5591         rcu_read_unlock();
5592
5593         rtnl_lock();
5594         link = rtnl_get_link(family, type);
5595         if (link && link->doit)
5596                 err = link->doit(skb, nlh, extack);
5597         rtnl_unlock();
5598
5599         module_put(owner);
5600
5601         return err;
5602
5603 out_unlock:
5604         rcu_read_unlock();
5605         return err;
5606
5607 err_unlock:
5608         rcu_read_unlock();
5609         return -EOPNOTSUPP;
5610 }
5611
5612 static void rtnetlink_rcv(struct sk_buff *skb)
5613 {
5614         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
5615 }
5616
5617 static int rtnetlink_bind(struct net *net, int group)
5618 {
5619         switch (group) {
5620         case RTNLGRP_IPV4_MROUTE_R:
5621         case RTNLGRP_IPV6_MROUTE_R:
5622                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5623                         return -EPERM;
5624                 break;
5625         }
5626         return 0;
5627 }
5628
5629 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
5630 {
5631         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5632
5633         switch (event) {
5634         case NETDEV_REBOOT:
5635         case NETDEV_CHANGEMTU:
5636         case NETDEV_CHANGEADDR:
5637         case NETDEV_CHANGENAME:
5638         case NETDEV_FEAT_CHANGE:
5639         case NETDEV_BONDING_FAILOVER:
5640         case NETDEV_POST_TYPE_CHANGE:
5641         case NETDEV_NOTIFY_PEERS:
5642         case NETDEV_CHANGEUPPER:
5643         case NETDEV_RESEND_IGMP:
5644         case NETDEV_CHANGEINFODATA:
5645         case NETDEV_CHANGELOWERSTATE:
5646         case NETDEV_CHANGE_TX_QUEUE_LEN:
5647                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
5648                                    GFP_KERNEL, NULL, 0);
5649                 break;
5650         default:
5651                 break;
5652         }
5653         return NOTIFY_DONE;
5654 }
5655
5656 static struct notifier_block rtnetlink_dev_notifier = {
5657         .notifier_call  = rtnetlink_event,
5658 };
5659
5660
5661 static int __net_init rtnetlink_net_init(struct net *net)
5662 {
5663         struct sock *sk;
5664         struct netlink_kernel_cfg cfg = {
5665                 .groups         = RTNLGRP_MAX,
5666                 .input          = rtnetlink_rcv,
5667                 .cb_mutex       = &rtnl_mutex,
5668                 .flags          = NL_CFG_F_NONROOT_RECV,
5669                 .bind           = rtnetlink_bind,
5670         };
5671
5672         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
5673         if (!sk)
5674                 return -ENOMEM;
5675         net->rtnl = sk;
5676         return 0;
5677 }
5678
5679 static void __net_exit rtnetlink_net_exit(struct net *net)
5680 {
5681         netlink_kernel_release(net->rtnl);
5682         net->rtnl = NULL;
5683 }
5684
5685 static struct pernet_operations rtnetlink_net_ops = {
5686         .init = rtnetlink_net_init,
5687         .exit = rtnetlink_net_exit,
5688 };
5689
5690 void __init rtnetlink_init(void)
5691 {
5692         if (register_pernet_subsys(&rtnetlink_net_ops))
5693                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
5694
5695         register_netdevice_notifier(&rtnetlink_dev_notifier);
5696
5697         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
5698                       rtnl_dump_ifinfo, 0);
5699         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
5700         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
5701         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
5702
5703         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
5704         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
5705         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
5706
5707         rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
5708         rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
5709
5710         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
5711         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
5712         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
5713
5714         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
5715         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
5716         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
5717
5718         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
5719                       0);
5720 }