net/core/rtnetlink.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Routing netlink socket interface: protocol independent part.
   7  *
   8  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   9  *
  10  *              This program is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  *
  15  *      Fixes:
  16  *      Vitaly E. Lavrov                RTA_OK arithmetics was wrong.
  17  */
  18
  19 #include <linux/bitops.h>
  20 #include <linux/errno.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/kernel.h>
  25 #include <linux/timer.h>
  26 #include <linux/string.h>
  27 #include <linux/sockios.h>
  28 #include <linux/net.h>
  29 #include <linux/fcntl.h>
  30 #include <linux/mm.h>
  31 #include <linux/slab.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/capability.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/init.h>
  36 #include <linux/security.h>
  37 #include <linux/mutex.h>
  38 #include <linux/if_addr.h>
  39 #include <linux/if_bridge.h>
  40 #include <linux/if_vlan.h>
  41 #include <linux/pci.h>
  42 #include <linux/etherdevice.h>
  43 #include <linux/bpf.h>
  44
  45 #include <linux/uaccess.h>
  46
  47 #include <linux/inet.h>
  48 #include <linux/netdevice.h>
  49 #include <net/switchdev.h>
  50 #include <net/ip.h>
  51 #include <net/protocol.h>
  52 #include <net/arp.h>
  53 #include <net/route.h>
  54 #include <net/udp.h>
  55 #include <net/tcp.h>
  56 #include <net/sock.h>
  57 #include <net/pkt_sched.h>
  58 #include <net/fib_rules.h>
  59 #include <net/rtnetlink.h>
  60 #include <net/net_namespace.h>
  61
  62 #define RTNL_MAX_TYPE           50
  63 #define RTNL_SLAVE_MAX_TYPE     36
  64
  65 struct rtnl_link {
  66         rtnl_doit_func          doit;
  67         rtnl_dumpit_func        dumpit;
  68         struct module           *owner;
  69         unsigned int            flags;
  70         struct rcu_head         rcu;
  71 };
  72
  73 static DEFINE_MUTEX(rtnl_mutex);
  74
  75 void rtnl_lock(void)
  76 {
  77         mutex_lock(&rtnl_mutex);
  78 }
  79 EXPORT_SYMBOL(rtnl_lock);
  80
  81 int rtnl_lock_killable(void)
  82 {
  83         return mutex_lock_killable(&rtnl_mutex);
  84 }
  85 EXPORT_SYMBOL(rtnl_lock_killable);
  86
  87 static struct sk_buff *defer_kfree_skb_list;
  88 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
  89 {
  90         if (head && tail) {
  91                 tail->next = defer_kfree_skb_list;
  92                 defer_kfree_skb_list = head;
  93         }
  94 }
  95 EXPORT_SYMBOL(rtnl_kfree_skbs);
  96
  97 void __rtnl_unlock(void)
  98 {
  99         struct sk_buff *head = defer_kfree_skb_list;
 100
 101         defer_kfree_skb_list = NULL;
 102
 103         mutex_unlock(&rtnl_mutex);
 104
 105         while (head) {
 106                 struct sk_buff *next = head->next;
 107
 108                 kfree_skb(head);
 109                 cond_resched();
 110                 head = next;
 111         }
 112 }
 113
 114 void rtnl_unlock(void)
 115 {
 116         /* This fellow will unlock it for us. */
 117         netdev_run_todo();
 118 }
 119 EXPORT_SYMBOL(rtnl_unlock);
 120
 121 int rtnl_trylock(void)
 122 {
 123         return mutex_trylock(&rtnl_mutex);
 124 }
 125 EXPORT_SYMBOL(rtnl_trylock);
 126
 127 int rtnl_is_locked(void)
 128 {
 129         return mutex_is_locked(&rtnl_mutex);
 130 }
 131 EXPORT_SYMBOL(rtnl_is_locked);
 132
 133 bool refcount_dec_and_rtnl_lock(refcount_t *r)
 134 {
 135         return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
 136 }
 137 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
 138
 139 #ifdef CONFIG_PROVE_LOCKING
 140 bool lockdep_rtnl_is_held(void)
 141 {
 142         return lockdep_is_held(&rtnl_mutex);
 143 }
 144 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 145 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 146
 147 static struct rtnl_link *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 148
 149 static inline int rtm_msgindex(int msgtype)
 150 {
 151         int msgindex = msgtype - RTM_BASE;
 152
 153         /*
 154          * msgindex < 0 implies someone tried to register a netlink
 155          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 156          * the message type has not been added to linux/rtnetlink.h
 157          */
 158         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 159
 160         return msgindex;
 161 }
 162
 163 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
 164 {
 165         struct rtnl_link **tab;
 166
 167         if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
 168                 protocol = PF_UNSPEC;
 169
 170         tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
 171         if (!tab)
 172                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
 173
 174         return tab[msgtype];
 175 }
 176
 177 static int rtnl_register_internal(struct module *owner,
 178                                   int protocol, int msgtype,
 179                                   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 180                                   unsigned int flags)
 181 {
 182         struct rtnl_link *link, *old;
 183         struct rtnl_link __rcu **tab;
 184         int msgindex;
 185         int ret = -ENOBUFS;
 186
 187         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 188         msgindex = rtm_msgindex(msgtype);
 189
 190         rtnl_lock();
 191         tab = rtnl_msg_handlers[protocol];
 192         if (tab == NULL) {
 193                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
 194                 if (!tab)
 195                         goto unlock;
 196
 197                 /* ensures we see the 0 stores */
 198                 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
 199         }
 200
 201         old = rtnl_dereference(tab[msgindex]);
 202         if (old) {
 203                 link = kmemdup(old, sizeof(*old), GFP_KERNEL);
 204                 if (!link)
 205                         goto unlock;
 206         } else {
 207                 link = kzalloc(sizeof(*link), GFP_KERNEL);
 208                 if (!link)
 209                         goto unlock;
 210         }
 211
 212         WARN_ON(link->owner && link->owner != owner);
 213         link->owner = owner;
 214
 215         WARN_ON(doit && link->doit && link->doit != doit);
 216         if (doit)
 217                 link->doit = doit;
 218         WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
 219         if (dumpit)
 220                 link->dumpit = dumpit;
 221
 222         link->flags |= flags;
 223
 224         /* publish protocol:msgtype */
 225         rcu_assign_pointer(tab[msgindex], link);
 226         ret = 0;
 227         if (old)
 228                 kfree_rcu(old, rcu);
 229 unlock:
 230         rtnl_unlock();
 231         return ret;
 232 }
 233
 234 /**
 235  * rtnl_register_module - Register a rtnetlink message type
 236  *
 237  * @owner: module registering the hook (THIS_MODULE)
 238  * @protocol: Protocol family or PF_UNSPEC
 239  * @msgtype: rtnetlink message type
 240  * @doit: Function pointer called for each request message
 241  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 242  * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
 243  *
 244  * Like rtnl_register, but for use by removable modules.
 245  */
 246 int rtnl_register_module(struct module *owner,
 247                          int protocol, int msgtype,
 248                          rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 249                          unsigned int flags)
 250 {
 251         return rtnl_register_internal(owner, protocol, msgtype,
 252                                       doit, dumpit, flags);
 253 }
 254 EXPORT_SYMBOL_GPL(rtnl_register_module);
 255
 256 /**
 257  * rtnl_register - Register a rtnetlink message type
 258  * @protocol: Protocol family or PF_UNSPEC
 259  * @msgtype: rtnetlink message type
 260  * @doit: Function pointer called for each request message
 261  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 262  * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
 263  *
 264  * Registers the specified function pointers (at least one of them has
 265  * to be non-NULL) to be called whenever a request message for the
 266  * specified protocol family and message type is received.
 267  *
 268  * The special protocol family PF_UNSPEC may be used to define fallback
 269  * function pointers for the case when no entry for the specific protocol
 270  * family exists.
 271  */
 272 void rtnl_register(int protocol, int msgtype,
 273                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 274                    unsigned int flags)
 275 {
 276         int err;
 277
 278         err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
 279                                      flags);
 280         if (err)
 281                 pr_err("Unable to register rtnetlink message handler, "
 282                        "protocol = %d, message type = %d\n", protocol, msgtype);
 283 }
 284
 285 /**
 286  * rtnl_unregister - Unregister a rtnetlink message type
 287  * @protocol: Protocol family or PF_UNSPEC
 288  * @msgtype: rtnetlink message type
 289  *
 290  * Returns 0 on success or a negative error code.
 291  */
 292 int rtnl_unregister(int protocol, int msgtype)
 293 {
 294         struct rtnl_link **tab, *link;
 295         int msgindex;
 296
 297         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 298         msgindex = rtm_msgindex(msgtype);
 299
 300         rtnl_lock();
 301         tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
 302         if (!tab) {
 303                 rtnl_unlock();
 304                 return -ENOENT;
 305         }
 306
 307         link = tab[msgindex];
 308         rcu_assign_pointer(tab[msgindex], NULL);
 309         rtnl_unlock();
 310
 311         kfree_rcu(link, rcu);
 312
 313         return 0;
 314 }
 315 EXPORT_SYMBOL_GPL(rtnl_unregister);
 316
 317 /**
 318  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 319  * @protocol : Protocol family or PF_UNSPEC
 320  *
 321  * Identical to calling rtnl_unregster() for all registered message types
 322  * of a certain protocol family.
 323  */
 324 void rtnl_unregister_all(int protocol)
 325 {
 326         struct rtnl_link **tab, *link;
 327         int msgindex;
 328
 329         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 330
 331         rtnl_lock();
 332         tab = rtnl_msg_handlers[protocol];
 333         if (!tab) {
 334                 rtnl_unlock();
 335                 return;
 336         }
 337         RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
 338         for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
 339                 link = tab[msgindex];
 340                 if (!link)
 341                         continue;
 342
 343                 rcu_assign_pointer(tab[msgindex], NULL);
 344                 kfree_rcu(link, rcu);
 345         }
 346         rtnl_unlock();
 347
 348         synchronize_net();
 349
 350         kfree(tab);
 351 }
 352 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 353
 354 static LIST_HEAD(link_ops);
 355
 356 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 357 {
 358         const struct rtnl_link_ops *ops;
 359
 360         list_for_each_entry(ops, &link_ops, list) {
 361                 if (!strcmp(ops->kind, kind))
 362                         return ops;
 363         }
 364         return NULL;
 365 }
 366
 367 /**
 368  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 369  * @ops: struct rtnl_link_ops * to register
 370  *
 371  * The caller must hold the rtnl_mutex. This function should be used
 372  * by drivers that create devices during module initialization. It
 373  * must be called before registering the devices.
 374  *
 375  * Returns 0 on success or a negative error code.
 376  */
 377 int __rtnl_link_register(struct rtnl_link_ops *ops)
 378 {
 379         if (rtnl_link_ops_get(ops->kind))
 380                 return -EEXIST;
 381
 382         /* The check for setup is here because if ops
 383          * does not have that filled up, it is not possible
 384          * to use the ops for creating device. So do not
 385          * fill up dellink as well. That disables rtnl_dellink.
 386          */
 387         if (ops->setup && !ops->dellink)
 388                 ops->dellink = unregister_netdevice_queue;
 389
 390         list_add_tail(&ops->list, &link_ops);
 391         return 0;
 392 }
 393 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 394
 395 /**
 396  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 397  * @ops: struct rtnl_link_ops * to register
 398  *
 399  * Returns 0 on success or a negative error code.
 400  */
 401 int rtnl_link_register(struct rtnl_link_ops *ops)
 402 {
 403         int err;
 404
 405         /* Sanity-check max sizes to avoid stack buffer overflow. */
 406         if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
 407                     ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
 408                 return -EINVAL;
 409
 410         rtnl_lock();
 411         err = __rtnl_link_register(ops);
 412         rtnl_unlock();
 413         return err;
 414 }
 415 EXPORT_SYMBOL_GPL(rtnl_link_register);
 416
 417 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 418 {
 419         struct net_device *dev;
 420         LIST_HEAD(list_kill);
 421
 422         for_each_netdev(net, dev) {
 423                 if (dev->rtnl_link_ops == ops)
 424                         ops->dellink(dev, &list_kill);
 425         }
 426         unregister_netdevice_many(&list_kill);
 427 }
 428
 429 /**
 430  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 431  * @ops: struct rtnl_link_ops * to unregister
 432  *
 433  * The caller must hold the rtnl_mutex and guarantee net_namespace_list
 434  * integrity (hold pernet_ops_rwsem for writing to close the race
 435  * with setup_net() and cleanup_net()).
 436  */
 437 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 438 {
 439         struct net *net;
 440
 441         for_each_net(net) {
 442                 __rtnl_kill_links(net, ops);
 443         }
 444         list_del(&ops->list);
 445 }
 446 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 447
 448 /* Return with the rtnl_lock held when there are no network
 449  * devices unregistering in any network namespace.
 450  */
 451 static void rtnl_lock_unregistering_all(void)
 452 {
 453         struct net *net;
 454         bool unregistering;
 455         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 456
 457         add_wait_queue(&netdev_unregistering_wq, &wait);
 458         for (;;) {
 459                 unregistering = false;
 460                 rtnl_lock();
 461                 /* We held write locked pernet_ops_rwsem, and parallel
 462                  * setup_net() and cleanup_net() are not possible.
 463                  */
 464                 for_each_net(net) {
 465                         if (net->dev_unreg_count > 0) {
 466                                 unregistering = true;
 467                                 break;
 468                         }
 469                 }
 470                 if (!unregistering)
 471                         break;
 472                 __rtnl_unlock();
 473
 474                 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 475         }
 476         remove_wait_queue(&netdev_unregistering_wq, &wait);
 477 }
 478
 479 /**
 480  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 481  * @ops: struct rtnl_link_ops * to unregister
 482  */
 483 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 484 {
 485         /* Close the race with setup_net() and cleanup_net() */
 486         down_write(&pernet_ops_rwsem);
 487         rtnl_lock_unregistering_all();
 488         __rtnl_link_unregister(ops);
 489         rtnl_unlock();
 490         up_write(&pernet_ops_rwsem);
 491 }
 492 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 493
 494 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 495 {
 496         struct net_device *master_dev;
 497         const struct rtnl_link_ops *ops;
 498         size_t size = 0;
 499
 500         rcu_read_lock();
 501
 502         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 503         if (!master_dev)
 504                 goto out;
 505
 506         ops = master_dev->rtnl_link_ops;
 507         if (!ops || !ops->get_slave_size)
 508                 goto out;
 509         /* IFLA_INFO_SLAVE_DATA + nested data */
 510         size = nla_total_size(sizeof(struct nlattr)) +
 511                ops->get_slave_size(master_dev, dev);
 512
 513 out:
 514         rcu_read_unlock();
 515         return size;
 516 }
 517
 518 static size_t rtnl_link_get_size(const struct net_device *dev)
 519 {
 520         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 521         size_t size;
 522
 523         if (!ops)
 524                 return 0;
 525
 526         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 527                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 528
 529         if (ops->get_size)
 530                 /* IFLA_INFO_DATA + nested data */
 531                 size += nla_total_size(sizeof(struct nlattr)) +
 532                         ops->get_size(dev);
 533
 534         if (ops->get_xstats_size)
 535                 /* IFLA_INFO_XSTATS */
 536                 size += nla_total_size(ops->get_xstats_size(dev));
 537
 538         size += rtnl_link_get_slave_info_data_size(dev);
 539
 540         return size;
 541 }
 542
 543 static LIST_HEAD(rtnl_af_ops);
 544
 545 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 546 {
 547         const struct rtnl_af_ops *ops;
 548
 549         list_for_each_entry_rcu(ops, &rtnl_af_ops, list) {
 550                 if (ops->family == family)
 551                         return ops;
 552         }
 553
 554         return NULL;
 555 }
 556
 557 /**
 558  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 559  * @ops: struct rtnl_af_ops * to register
 560  *
 561  * Returns 0 on success or a negative error code.
 562  */
 563 void rtnl_af_register(struct rtnl_af_ops *ops)
 564 {
 565         rtnl_lock();
 566         list_add_tail_rcu(&ops->list, &rtnl_af_ops);
 567         rtnl_unlock();
 568 }
 569 EXPORT_SYMBOL_GPL(rtnl_af_register);
 570
 571 /**
 572  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 573  * @ops: struct rtnl_af_ops * to unregister
 574  */
 575 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 576 {
 577         rtnl_lock();
 578         list_del_rcu(&ops->list);
 579         rtnl_unlock();
 580
 581         synchronize_rcu();
 582 }
 583 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 584
 585 static size_t rtnl_link_get_af_size(const struct net_device *dev,
 586                                     u32 ext_filter_mask)
 587 {
 588         struct rtnl_af_ops *af_ops;
 589         size_t size;
 590
 591         /* IFLA_AF_SPEC */
 592         size = nla_total_size(sizeof(struct nlattr));
 593
 594         rcu_read_lock();
 595         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
 596                 if (af_ops->get_link_af_size) {
 597                         /* AF_* + nested data */
 598                         size += nla_total_size(sizeof(struct nlattr)) +
 599                                 af_ops->get_link_af_size(dev, ext_filter_mask);
 600                 }
 601         }
 602         rcu_read_unlock();
 603
 604         return size;
 605 }
 606
 607 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 608 {
 609         struct net_device *master_dev;
 610         bool ret = false;
 611
 612         rcu_read_lock();
 613
 614         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 615         if (master_dev && master_dev->rtnl_link_ops)
 616                 ret = true;
 617         rcu_read_unlock();
 618         return ret;
 619 }
 620
 621 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 622                                      const struct net_device *dev)
 623 {
 624         struct net_device *master_dev;
 625         const struct rtnl_link_ops *ops;
 626         struct nlattr *slave_data;
 627         int err;
 628
 629         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 630         if (!master_dev)
 631                 return 0;
 632         ops = master_dev->rtnl_link_ops;
 633         if (!ops)
 634                 return 0;
 635         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 636                 return -EMSGSIZE;
 637         if (ops->fill_slave_info) {
 638                 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
 639                 if (!slave_data)
 640                         return -EMSGSIZE;
 641                 err = ops->fill_slave_info(skb, master_dev, dev);
 642                 if (err < 0)
 643                         goto err_cancel_slave_data;
 644                 nla_nest_end(skb, slave_data);
 645         }
 646         return 0;
 647
 648 err_cancel_slave_data:
 649         nla_nest_cancel(skb, slave_data);
 650         return err;
 651 }
 652
 653 static int rtnl_link_info_fill(struct sk_buff *skb,
 654                                const struct net_device *dev)
 655 {
 656         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 657         struct nlattr *data;
 658         int err;
 659
 660         if (!ops)
 661                 return 0;
 662         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 663                 return -EMSGSIZE;
 664         if (ops->fill_xstats) {
 665                 err = ops->fill_xstats(skb, dev);
 666                 if (err < 0)
 667                         return err;
 668         }
 669         if (ops->fill_info) {
 670                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 671                 if (data == NULL)
 672                         return -EMSGSIZE;
 673                 err = ops->fill_info(skb, dev);
 674                 if (err < 0)
 675                         goto err_cancel_data;
 676                 nla_nest_end(skb, data);
 677         }
 678         return 0;
 679
 680 err_cancel_data:
 681         nla_nest_cancel(skb, data);
 682         return err;
 683 }
 684
 685 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 686 {
 687         struct nlattr *linkinfo;
 688         int err = -EMSGSIZE;
 689
 690         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 691         if (linkinfo == NULL)
 692                 goto out;
 693
 694         err = rtnl_link_info_fill(skb, dev);
 695         if (err < 0)
 696                 goto err_cancel_link;
 697
 698         err = rtnl_link_slave_info_fill(skb, dev);
 699         if (err < 0)
 700                 goto err_cancel_link;
 701
 702         nla_nest_end(skb, linkinfo);
 703         return 0;
 704
 705 err_cancel_link:
 706         nla_nest_cancel(skb, linkinfo);
 707 out:
 708         return err;
 709 }
 710
 711 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 712 {
 713         struct sock *rtnl = net->rtnl;
 714         int err = 0;
 715
 716         NETLINK_CB(skb).dst_group = group;
 717         if (echo)
 718                 refcount_inc(&skb->users);
 719         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 720         if (echo)
 721                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 722         return err;
 723 }
 724
 725 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 726 {
 727         struct sock *rtnl = net->rtnl;
 728
 729         return nlmsg_unicast(rtnl, skb, pid);
 730 }
 731 EXPORT_SYMBOL(rtnl_unicast);
 732
 733 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 734                  struct nlmsghdr *nlh, gfp_t flags)
 735 {
 736         struct sock *rtnl = net->rtnl;
 737         int report = 0;
 738
 739         if (nlh)
 740                 report = nlmsg_report(nlh);
 741
 742         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 743 }
 744 EXPORT_SYMBOL(rtnl_notify);
 745
 746 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 747 {
 748         struct sock *rtnl = net->rtnl;
 749
 750         netlink_set_err(rtnl, 0, group, error);
 751 }
 752 EXPORT_SYMBOL(rtnl_set_sk_err);
 753
 754 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 755 {
 756         struct nlattr *mx;
 757         int i, valid = 0;
 758
 759         mx = nla_nest_start(skb, RTA_METRICS);
 760         if (mx == NULL)
 761                 return -ENOBUFS;
 762
 763         for (i = 0; i < RTAX_MAX; i++) {
 764                 if (metrics[i]) {
 765                         if (i == RTAX_CC_ALGO - 1) {
 766                                 char tmp[TCP_CA_NAME_MAX], *name;
 767
 768                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 769                                 if (!name)
 770                                         continue;
 771                                 if (nla_put_string(skb, i + 1, name))
 772                                         goto nla_put_failure;
 773                         } else if (i == RTAX_FEATURES - 1) {
 774                                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 775
 776                                 if (!user_features)
 777                                         continue;
 778                                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 779                                 if (nla_put_u32(skb, i + 1, user_features))
 780                                         goto nla_put_failure;
 781                         } else {
 782                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 783                                         goto nla_put_failure;
 784                         }
 785                         valid++;
 786                 }
 787         }
 788
 789         if (!valid) {
 790                 nla_nest_cancel(skb, mx);
 791                 return 0;
 792         }
 793
 794         return nla_nest_end(skb, mx);
 795
 796 nla_put_failure:
 797         nla_nest_cancel(skb, mx);
 798         return -EMSGSIZE;
 799 }
 800 EXPORT_SYMBOL(rtnetlink_put_metrics);
 801
 802 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 803                        long expires, u32 error)
 804 {
 805         struct rta_cacheinfo ci = {
 806                 .rta_error = error,
 807                 .rta_id =  id,
 808         };
 809
 810         if (dst) {
 811                 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
 812                 ci.rta_used = dst->__use;
 813                 ci.rta_clntref = atomic_read(&dst->__refcnt);
 814         }
 815         if (expires) {
 816                 unsigned long clock;
 817
 818                 clock = jiffies_to_clock_t(abs(expires));
 819                 clock = min_t(unsigned long, clock, INT_MAX);
 820                 ci.rta_expires = (expires > 0) ? clock : -clock;
 821         }
 822         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 823 }
 824 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 825
 826 static void set_operstate(struct net_device *dev, unsigned char transition)
 827 {
 828         unsigned char operstate = dev->operstate;
 829
 830         switch (transition) {
 831         case IF_OPER_UP:
 832                 if ((operstate == IF_OPER_DORMANT ||
 833                      operstate == IF_OPER_UNKNOWN) &&
 834                     !netif_dormant(dev))
 835                         operstate = IF_OPER_UP;
 836                 break;
 837
 838         case IF_OPER_DORMANT:
 839                 if (operstate == IF_OPER_UP ||
 840                     operstate == IF_OPER_UNKNOWN)
 841                         operstate = IF_OPER_DORMANT;
 842                 break;
 843         }
 844
 845         if (dev->operstate != operstate) {
 846                 write_lock_bh(&dev_base_lock);
 847                 dev->operstate = operstate;
 848                 write_unlock_bh(&dev_base_lock);
 849                 netdev_state_change(dev);
 850         }
 851 }
 852
 853 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 854 {
 855         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 856                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 857 }
 858
 859 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 860                                            const struct ifinfomsg *ifm)
 861 {
 862         unsigned int flags = ifm->ifi_flags;
 863
 864         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 865         if (ifm->ifi_change)
 866                 flags = (flags & ifm->ifi_change) |
 867                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 868
 869         return flags;
 870 }
 871
 872 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 873                                  const struct rtnl_link_stats64 *b)
 874 {
 875         a->rx_packets = b->rx_packets;
 876         a->tx_packets = b->tx_packets;
 877         a->rx_bytes = b->rx_bytes;
 878         a->tx_bytes = b->tx_bytes;
 879         a->rx_errors = b->rx_errors;
 880         a->tx_errors = b->tx_errors;
 881         a->rx_dropped = b->rx_dropped;
 882         a->tx_dropped = b->tx_dropped;
 883
 884         a->multicast = b->multicast;
 885         a->collisions = b->collisions;
 886
 887         a->rx_length_errors = b->rx_length_errors;
 888         a->rx_over_errors = b->rx_over_errors;
 889         a->rx_crc_errors = b->rx_crc_errors;
 890         a->rx_frame_errors = b->rx_frame_errors;
 891         a->rx_fifo_errors = b->rx_fifo_errors;
 892         a->rx_missed_errors = b->rx_missed_errors;
 893
 894         a->tx_aborted_errors = b->tx_aborted_errors;
 895         a->tx_carrier_errors = b->tx_carrier_errors;
 896         a->tx_fifo_errors = b->tx_fifo_errors;
 897         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 898         a->tx_window_errors = b->tx_window_errors;
 899
 900         a->rx_compressed = b->rx_compressed;
 901         a->tx_compressed = b->tx_compressed;
 902
 903         a->rx_nohandler = b->rx_nohandler;
 904 }
 905
 906 /* All VF info */
 907 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 908                                    u32 ext_filter_mask)
 909 {
 910         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
 911                 int num_vfs = dev_num_vf(dev->dev.parent);
 912                 size_t size = nla_total_size(0);
 913                 size += num_vfs *
 914                         (nla_total_size(0) +
 915                          nla_total_size(sizeof(struct ifla_vf_mac)) +
 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 noinline size_t if_nlmsg_size(const struct net_device *dev,
 984                                      u32 ext_filter_mask)
 985 {
 986         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 987                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 988                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 989                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 990                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
 991                + nla_total_size(sizeof(struct rtnl_link_stats))
 992                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
 993                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 994                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 995                + nla_total_size(4) /* IFLA_TXQLEN */
 996                + nla_total_size(4) /* IFLA_WEIGHT */
 997                + nla_total_size(4) /* IFLA_MTU */
 998                + nla_total_size(4) /* IFLA_LINK */
 999                + nla_total_size(4) /* IFLA_MASTER */
1000                + nla_total_size(1) /* IFLA_CARRIER */
1001                + nla_total_size(4) /* IFLA_PROMISCUITY */
1002                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1003                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1004                + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1005                + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1006                + nla_total_size(1) /* IFLA_OPERSTATE */
1007                + nla_total_size(1) /* IFLA_LINKMODE */
1008                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1009                + nla_total_size(4) /* IFLA_LINK_NETNSID */
1010                + nla_total_size(4) /* IFLA_GROUP */
1011                + nla_total_size(ext_filter_mask
1012                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1013                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1014                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1015                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1016                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1017                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1018                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1019                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1020                + rtnl_xdp_size() /* IFLA_XDP */
1021                + nla_total_size(4)  /* IFLA_EVENT */
1022                + nla_total_size(4)  /* IFLA_NEW_NETNSID */
1023                + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
1024                + nla_total_size(1)  /* IFLA_PROTO_DOWN */
1025                + nla_total_size(4)  /* IFLA_TARGET_NETNSID */
1026                + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
1027                + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
1028                + nla_total_size(4)  /* IFLA_MIN_MTU */
1029                + nla_total_size(4)  /* IFLA_MAX_MTU */
1030                + 0;
1031 }
1032
1033 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1034 {
1035         struct nlattr *vf_ports;
1036         struct nlattr *vf_port;
1037         int vf;
1038         int err;
1039
1040         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
1041         if (!vf_ports)
1042                 return -EMSGSIZE;
1043
1044         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1045                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
1046                 if (!vf_port)
1047                         goto nla_put_failure;
1048                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1049                         goto nla_put_failure;
1050                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1051                 if (err == -EMSGSIZE)
1052                         goto nla_put_failure;
1053                 if (err) {
1054                         nla_nest_cancel(skb, vf_port);
1055                         continue;
1056                 }
1057                 nla_nest_end(skb, vf_port);
1058         }
1059
1060         nla_nest_end(skb, vf_ports);
1061
1062         return 0;
1063
1064 nla_put_failure:
1065         nla_nest_cancel(skb, vf_ports);
1066         return -EMSGSIZE;
1067 }
1068
1069 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1070 {
1071         struct nlattr *port_self;
1072         int err;
1073
1074         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
1075         if (!port_self)
1076                 return -EMSGSIZE;
1077
1078         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1079         if (err) {
1080                 nla_nest_cancel(skb, port_self);
1081                 return (err == -EMSGSIZE) ? err : 0;
1082         }
1083
1084         nla_nest_end(skb, port_self);
1085
1086         return 0;
1087 }
1088
1089 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1090                           u32 ext_filter_mask)
1091 {
1092         int err;
1093
1094         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1095             !(ext_filter_mask & RTEXT_FILTER_VF))
1096                 return 0;
1097
1098         err = rtnl_port_self_fill(skb, dev);
1099         if (err)
1100                 return err;
1101
1102         if (dev_num_vf(dev->dev.parent)) {
1103                 err = rtnl_vf_ports_fill(skb, dev);
1104                 if (err)
1105                         return err;
1106         }
1107
1108         return 0;
1109 }
1110
1111 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1112 {
1113         int err;
1114         struct netdev_phys_item_id ppid;
1115
1116         err = dev_get_phys_port_id(dev, &ppid);
1117         if (err) {
1118                 if (err == -EOPNOTSUPP)
1119                         return 0;
1120                 return err;
1121         }
1122
1123         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1124                 return -EMSGSIZE;
1125
1126         return 0;
1127 }
1128
1129 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1130 {
1131         char name[IFNAMSIZ];
1132         int err;
1133
1134         err = dev_get_phys_port_name(dev, name, sizeof(name));
1135         if (err) {
1136                 if (err == -EOPNOTSUPP)
1137                         return 0;
1138                 return err;
1139         }
1140
1141         if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1142                 return -EMSGSIZE;
1143
1144         return 0;
1145 }
1146
1147 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1148 {
1149         int err;
1150         struct switchdev_attr attr = {
1151                 .orig_dev = dev,
1152                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1153                 .flags = SWITCHDEV_F_NO_RECURSE,
1154         };
1155
1156         err = switchdev_port_attr_get(dev, &attr);
1157         if (err) {
1158                 if (err == -EOPNOTSUPP)
1159                         return 0;
1160                 return err;
1161         }
1162
1163         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1164                     attr.u.ppid.id))
1165                 return -EMSGSIZE;
1166
1167         return 0;
1168 }
1169
1170 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1171                                               struct net_device *dev)
1172 {
1173         struct rtnl_link_stats64 *sp;
1174         struct nlattr *attr;
1175
1176         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1177                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1178         if (!attr)
1179                 return -EMSGSIZE;
1180
1181         sp = nla_data(attr);
1182         dev_get_stats(dev, sp);
1183
1184         attr = nla_reserve(skb, IFLA_STATS,
1185                            sizeof(struct rtnl_link_stats));
1186         if (!attr)
1187                 return -EMSGSIZE;
1188
1189         copy_rtnl_link_stats(nla_data(attr), sp);
1190
1191         return 0;
1192 }
1193
1194 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1195                                                struct net_device *dev,
1196                                                int vfs_num,
1197                                                struct nlattr *vfinfo)
1198 {
1199         struct ifla_vf_rss_query_en vf_rss_query_en;
1200         struct nlattr *vf, *vfstats, *vfvlanlist;
1201         struct ifla_vf_link_state vf_linkstate;
1202         struct ifla_vf_vlan_info vf_vlan_info;
1203         struct ifla_vf_spoofchk vf_spoofchk;
1204         struct ifla_vf_tx_rate vf_tx_rate;
1205         struct ifla_vf_stats vf_stats;
1206         struct ifla_vf_trust vf_trust;
1207         struct ifla_vf_vlan vf_vlan;
1208         struct ifla_vf_rate vf_rate;
1209         struct ifla_vf_mac vf_mac;
1210         struct ifla_vf_info ivi;
1211
1212         memset(&ivi, 0, sizeof(ivi));
1213
1214         /* Not all SR-IOV capable drivers support the
1215          * spoofcheck and "RSS query enable" query.  Preset to
1216          * -1 so the user space tool can detect that the driver
1217          * didn't report anything.
1218          */
1219         ivi.spoofchk = -1;
1220         ivi.rss_query_en = -1;
1221         ivi.trusted = -1;
1222         /* The default value for VF link state is "auto"
1223          * IFLA_VF_LINK_STATE_AUTO which equals zero
1224          */
1225         ivi.linkstate = 0;
1226         /* VLAN Protocol by default is 802.1Q */
1227         ivi.vlan_proto = htons(ETH_P_8021Q);
1228         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1229                 return 0;
1230
1231         memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1232
1233         vf_mac.vf =
1234                 vf_vlan.vf =
1235                 vf_vlan_info.vf =
1236                 vf_rate.vf =
1237                 vf_tx_rate.vf =
1238                 vf_spoofchk.vf =
1239                 vf_linkstate.vf =
1240                 vf_rss_query_en.vf =
1241                 vf_trust.vf = ivi.vf;
1242
1243         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1244         vf_vlan.vlan = ivi.vlan;
1245         vf_vlan.qos = ivi.qos;
1246         vf_vlan_info.vlan = ivi.vlan;
1247         vf_vlan_info.qos = ivi.qos;
1248         vf_vlan_info.vlan_proto = ivi.vlan_proto;
1249         vf_tx_rate.rate = ivi.max_tx_rate;
1250         vf_rate.min_tx_rate = ivi.min_tx_rate;
1251         vf_rate.max_tx_rate = ivi.max_tx_rate;
1252         vf_spoofchk.setting = ivi.spoofchk;
1253         vf_linkstate.link_state = ivi.linkstate;
1254         vf_rss_query_en.setting = ivi.rss_query_en;
1255         vf_trust.setting = ivi.trusted;
1256         vf = nla_nest_start(skb, IFLA_VF_INFO);
1257         if (!vf)
1258                 goto nla_put_vfinfo_failure;
1259         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1260             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1261             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1262                     &vf_rate) ||
1263             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1264                     &vf_tx_rate) ||
1265             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1266                     &vf_spoofchk) ||
1267             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1268                     &vf_linkstate) ||
1269             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1270                     sizeof(vf_rss_query_en),
1271                     &vf_rss_query_en) ||
1272             nla_put(skb, IFLA_VF_TRUST,
1273                     sizeof(vf_trust), &vf_trust))
1274                 goto nla_put_vf_failure;
1275         vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST);
1276         if (!vfvlanlist)
1277                 goto nla_put_vf_failure;
1278         if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1279                     &vf_vlan_info)) {
1280                 nla_nest_cancel(skb, vfvlanlist);
1281                 goto nla_put_vf_failure;
1282         }
1283         nla_nest_end(skb, vfvlanlist);
1284         memset(&vf_stats, 0, sizeof(vf_stats));
1285         if (dev->netdev_ops->ndo_get_vf_stats)
1286                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1287                                                 &vf_stats);
1288         vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1289         if (!vfstats)
1290                 goto nla_put_vf_failure;
1291         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1292                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1293             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1294                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1295             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1296                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1297             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1298                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1299             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1300                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1301             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1302                               vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1303             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1304                               vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1305             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1306                               vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1307                 nla_nest_cancel(skb, vfstats);
1308                 goto nla_put_vf_failure;
1309         }
1310         nla_nest_end(skb, vfstats);
1311         nla_nest_end(skb, vf);
1312         return 0;
1313
1314 nla_put_vf_failure:
1315         nla_nest_cancel(skb, vf);
1316 nla_put_vfinfo_failure:
1317         nla_nest_cancel(skb, vfinfo);
1318         return -EMSGSIZE;
1319 }
1320
1321 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1322                                            struct net_device *dev,
1323                                            u32 ext_filter_mask)
1324 {
1325         struct nlattr *vfinfo;
1326         int i, num_vfs;
1327
1328         if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1329                 return 0;
1330
1331         num_vfs = dev_num_vf(dev->dev.parent);
1332         if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1333                 return -EMSGSIZE;
1334
1335         if (!dev->netdev_ops->ndo_get_vf_config)
1336                 return 0;
1337
1338         vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1339         if (!vfinfo)
1340                 return -EMSGSIZE;
1341
1342         for (i = 0; i < num_vfs; i++) {
1343                 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1344                         return -EMSGSIZE;
1345         }
1346
1347         nla_nest_end(skb, vfinfo);
1348         return 0;
1349 }
1350
1351 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1352 {
1353         struct rtnl_link_ifmap map;
1354
1355         memset(&map, 0, sizeof(map));
1356         map.mem_start   = dev->mem_start;
1357         map.mem_end     = dev->mem_end;
1358         map.base_addr   = dev->base_addr;
1359         map.irq         = dev->irq;
1360         map.dma         = dev->dma;
1361         map.port        = dev->if_port;
1362
1363         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1364                 return -EMSGSIZE;
1365
1366         return 0;
1367 }
1368
1369 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1370 {
1371         const struct bpf_prog *generic_xdp_prog;
1372
1373         ASSERT_RTNL();
1374
1375         generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1376         if (!generic_xdp_prog)
1377                 return 0;
1378         return generic_xdp_prog->aux->id;
1379 }
1380
1381 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1382 {
1383         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf, XDP_QUERY_PROG);
1384 }
1385
1386 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1387 {
1388         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf,
1389                                XDP_QUERY_PROG_HW);
1390 }
1391
1392 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1393                                u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1394                                u32 (*get_prog_id)(struct net_device *dev))
1395 {
1396         u32 curr_id;
1397         int err;
1398
1399         curr_id = get_prog_id(dev);
1400         if (!curr_id)
1401                 return 0;
1402
1403         *prog_id = curr_id;
1404         err = nla_put_u32(skb, attr, curr_id);
1405         if (err)
1406                 return err;
1407
1408         if (*mode != XDP_ATTACHED_NONE)
1409                 *mode = XDP_ATTACHED_MULTI;
1410         else
1411                 *mode = tgt_mode;
1412
1413         return 0;
1414 }
1415
1416 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1417 {
1418         struct nlattr *xdp;
1419         u32 prog_id;
1420         int err;
1421         u8 mode;
1422
1423         xdp = nla_nest_start(skb, IFLA_XDP);
1424         if (!xdp)
1425                 return -EMSGSIZE;
1426
1427         prog_id = 0;
1428         mode = XDP_ATTACHED_NONE;
1429         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1430                                   IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1431         if (err)
1432                 goto err_cancel;
1433         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1434                                   IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1435         if (err)
1436                 goto err_cancel;
1437         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1438                                   IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1439         if (err)
1440                 goto err_cancel;
1441
1442         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1443         if (err)
1444                 goto err_cancel;
1445
1446         if (prog_id && mode != XDP_ATTACHED_MULTI) {
1447                 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1448                 if (err)
1449                         goto err_cancel;
1450         }
1451
1452         nla_nest_end(skb, xdp);
1453         return 0;
1454
1455 err_cancel:
1456         nla_nest_cancel(skb, xdp);
1457         return err;
1458 }
1459
1460 static u32 rtnl_get_event(unsigned long event)
1461 {
1462         u32 rtnl_event_type = IFLA_EVENT_NONE;
1463
1464         switch (event) {
1465         case NETDEV_REBOOT:
1466                 rtnl_event_type = IFLA_EVENT_REBOOT;
1467                 break;
1468         case NETDEV_FEAT_CHANGE:
1469                 rtnl_event_type = IFLA_EVENT_FEATURES;
1470                 break;
1471         case NETDEV_BONDING_FAILOVER:
1472                 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1473                 break;
1474         case NETDEV_NOTIFY_PEERS:
1475                 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1476                 break;
1477         case NETDEV_RESEND_IGMP:
1478                 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1479                 break;
1480         case NETDEV_CHANGEINFODATA:
1481                 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1482                 break;
1483         default:
1484                 break;
1485         }
1486
1487         return rtnl_event_type;
1488 }
1489
1490 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1491 {
1492         const struct net_device *upper_dev;
1493         int ret = 0;
1494
1495         rcu_read_lock();
1496
1497         upper_dev = netdev_master_upper_dev_get_rcu(dev);
1498         if (upper_dev)
1499                 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1500
1501         rcu_read_unlock();
1502         return ret;
1503 }
1504
1505 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev)
1506 {
1507         int ifindex = dev_get_iflink(dev);
1508
1509         if (dev->ifindex == ifindex)
1510                 return 0;
1511
1512         return nla_put_u32(skb, IFLA_LINK, ifindex);
1513 }
1514
1515 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1516                                               struct net_device *dev)
1517 {
1518         char buf[IFALIASZ];
1519         int ret;
1520
1521         ret = dev_get_alias(dev, buf, sizeof(buf));
1522         return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1523 }
1524
1525 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1526                                   const struct net_device *dev,
1527                                   struct net *src_net)
1528 {
1529         if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1530                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1531
1532                 if (!net_eq(dev_net(dev), link_net)) {
1533                         int id = peernet2id_alloc(src_net, link_net);
1534
1535                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1536                                 return -EMSGSIZE;
1537                 }
1538         }
1539
1540         return 0;
1541 }
1542
1543 static int rtnl_fill_link_af(struct sk_buff *skb,
1544                              const struct net_device *dev,
1545                              u32 ext_filter_mask)
1546 {
1547         const struct rtnl_af_ops *af_ops;
1548         struct nlattr *af_spec;
1549
1550         af_spec = nla_nest_start(skb, IFLA_AF_SPEC);
1551         if (!af_spec)
1552                 return -EMSGSIZE;
1553
1554         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1555                 struct nlattr *af;
1556                 int err;
1557
1558                 if (!af_ops->fill_link_af)
1559                         continue;
1560
1561                 af = nla_nest_start(skb, af_ops->family);
1562                 if (!af)
1563                         return -EMSGSIZE;
1564
1565                 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1566                 /*
1567                  * Caller may return ENODATA to indicate that there
1568                  * was no data to be dumped. This is not an error, it
1569                  * means we should trim the attribute header and
1570                  * continue.
1571                  */
1572                 if (err == -ENODATA)
1573                         nla_nest_cancel(skb, af);
1574                 else if (err < 0)
1575                         return -EMSGSIZE;
1576
1577                 nla_nest_end(skb, af);
1578         }
1579
1580         nla_nest_end(skb, af_spec);
1581         return 0;
1582 }
1583
1584 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1585                             struct net_device *dev, struct net *src_net,
1586                             int type, u32 pid, u32 seq, u32 change,
1587                             unsigned int flags, u32 ext_filter_mask,
1588                             u32 event, int *new_nsid, int new_ifindex,
1589                             int tgt_netnsid)
1590 {
1591         struct ifinfomsg *ifm;
1592         struct nlmsghdr *nlh;
1593
1594         ASSERT_RTNL();
1595         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1596         if (nlh == NULL)
1597                 return -EMSGSIZE;
1598
1599         ifm = nlmsg_data(nlh);
1600         ifm->ifi_family = AF_UNSPEC;
1601         ifm->__ifi_pad = 0;
1602         ifm->ifi_type = dev->type;
1603         ifm->ifi_index = dev->ifindex;
1604         ifm->ifi_flags = dev_get_flags(dev);
1605         ifm->ifi_change = change;
1606
1607         if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1608                 goto nla_put_failure;
1609
1610         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1611             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1612             nla_put_u8(skb, IFLA_OPERSTATE,
1613                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1614             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1615             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1616             nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1617             nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1618             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1619             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1620             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1621             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1622             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1623 #ifdef CONFIG_RPS
1624             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1625 #endif
1626             nla_put_iflink(skb, dev) ||
1627             put_master_ifindex(skb, dev) ||
1628             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1629             (dev->qdisc &&
1630              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1631             nla_put_ifalias(skb, dev) ||
1632             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1633                         atomic_read(&dev->carrier_up_count) +
1634                         atomic_read(&dev->carrier_down_count)) ||
1635             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down) ||
1636             nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1637                         atomic_read(&dev->carrier_up_count)) ||
1638             nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1639                         atomic_read(&dev->carrier_down_count)))
1640                 goto nla_put_failure;
1641
1642         if (event != IFLA_EVENT_NONE) {
1643                 if (nla_put_u32(skb, IFLA_EVENT, event))
1644                         goto nla_put_failure;
1645         }
1646
1647         if (rtnl_fill_link_ifmap(skb, dev))
1648                 goto nla_put_failure;
1649
1650         if (dev->addr_len) {
1651                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1652                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1653                         goto nla_put_failure;
1654         }
1655
1656         if (rtnl_phys_port_id_fill(skb, dev))
1657                 goto nla_put_failure;
1658
1659         if (rtnl_phys_port_name_fill(skb, dev))
1660                 goto nla_put_failure;
1661
1662         if (rtnl_phys_switch_id_fill(skb, dev))
1663                 goto nla_put_failure;
1664
1665         if (rtnl_fill_stats(skb, dev))
1666                 goto nla_put_failure;
1667
1668         if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1669                 goto nla_put_failure;
1670
1671         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1672                 goto nla_put_failure;
1673
1674         if (rtnl_xdp_fill(skb, dev))
1675                 goto nla_put_failure;
1676
1677         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1678                 if (rtnl_link_fill(skb, dev) < 0)
1679                         goto nla_put_failure;
1680         }
1681
1682         if (rtnl_fill_link_netnsid(skb, dev, src_net))
1683                 goto nla_put_failure;
1684
1685         if (new_nsid &&
1686             nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1687                 goto nla_put_failure;
1688         if (new_ifindex &&
1689             nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1690                 goto nla_put_failure;
1691
1692
1693         rcu_read_lock();
1694         if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1695                 goto nla_put_failure_rcu;
1696         rcu_read_unlock();
1697
1698         nlmsg_end(skb, nlh);
1699         return 0;
1700
1701 nla_put_failure_rcu:
1702         rcu_read_unlock();
1703 nla_put_failure:
1704         nlmsg_cancel(skb, nlh);
1705         return -EMSGSIZE;
1706 }
1707
1708 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1709         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1710         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1711         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1712         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1713         [IFLA_MTU]              = { .type = NLA_U32 },
1714         [IFLA_LINK]             = { .type = NLA_U32 },
1715         [IFLA_MASTER]           = { .type = NLA_U32 },
1716         [IFLA_CARRIER]          = { .type = NLA_U8 },
1717         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1718         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1719         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1720         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1721         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1722         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1723         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1724         /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1725          * allow 0-length string (needed to remove an alias).
1726          */
1727         [IFLA_IFALIAS]          = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1728         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1729         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1730         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1731         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1732         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1733         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1734         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1735         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1736         [IFLA_GSO_MAX_SEGS]     = { .type = NLA_U32 },
1737         [IFLA_GSO_MAX_SIZE]     = { .type = NLA_U32 },
1738         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1739         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1740         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1741         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1742         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1743         [IFLA_XDP]              = { .type = NLA_NESTED },
1744         [IFLA_EVENT]            = { .type = NLA_U32 },
1745         [IFLA_GROUP]            = { .type = NLA_U32 },
1746         [IFLA_TARGET_NETNSID]   = { .type = NLA_S32 },
1747         [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1748         [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1749         [IFLA_MIN_MTU]          = { .type = NLA_U32 },
1750         [IFLA_MAX_MTU]          = { .type = NLA_U32 },
1751 };
1752
1753 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1754         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1755         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1756         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1757         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1758 };
1759
1760 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1761         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1762         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1763         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1764         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1765         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1766         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1767         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1768         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1769         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1770         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1771         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1772         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1773 };
1774
1775 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1776         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1777         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1778                                     .len = PORT_PROFILE_MAX },
1779         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1780                                       .len = PORT_UUID_MAX },
1781         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1782                                     .len = PORT_UUID_MAX },
1783         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1784         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1785
1786         /* Unused, but we need to keep it here since user space could
1787          * fill it. It's also broken with regard to NLA_BINARY use in
1788          * combination with structs.
1789          */
1790         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1791                                     .len = sizeof(struct ifla_port_vsi) },
1792 };
1793
1794 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1795         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1796         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1797         [IFLA_XDP_FLAGS]        = { .type = NLA_U32 },
1798         [IFLA_XDP_PROG_ID]      = { .type = NLA_U32 },
1799 };
1800
1801 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1802 {
1803         const struct rtnl_link_ops *ops = NULL;
1804         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1805
1806         if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla,
1807                              ifla_info_policy, NULL) < 0)
1808                 return NULL;
1809
1810         if (linfo[IFLA_INFO_KIND]) {
1811                 char kind[MODULE_NAME_LEN];
1812
1813                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1814                 ops = rtnl_link_ops_get(kind);
1815         }
1816
1817         return ops;
1818 }
1819
1820 static bool link_master_filtered(struct net_device *dev, int master_idx)
1821 {
1822         struct net_device *master;
1823
1824         if (!master_idx)
1825                 return false;
1826
1827         master = netdev_master_upper_dev_get(dev);
1828         if (!master || master->ifindex != master_idx)
1829                 return true;
1830
1831         return false;
1832 }
1833
1834 static bool link_kind_filtered(const struct net_device *dev,
1835                                const struct rtnl_link_ops *kind_ops)
1836 {
1837         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1838                 return true;
1839
1840         return false;
1841 }
1842
1843 static bool link_dump_filtered(struct net_device *dev,
1844                                int master_idx,
1845                                const struct rtnl_link_ops *kind_ops)
1846 {
1847         if (link_master_filtered(dev, master_idx) ||
1848             link_kind_filtered(dev, kind_ops))
1849                 return true;
1850
1851         return false;
1852 }
1853
1854 /**
1855  * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
1856  * @sk: netlink socket
1857  * @netnsid: network namespace identifier
1858  *
1859  * Returns the network namespace identified by netnsid on success or an error
1860  * pointer on failure.
1861  */
1862 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
1863 {
1864         struct net *net;
1865
1866         net = get_net_ns_by_id(sock_net(sk), netnsid);
1867         if (!net)
1868                 return ERR_PTR(-EINVAL);
1869
1870         /* For now, the caller is required to have CAP_NET_ADMIN in
1871          * the user namespace owning the target net ns.
1872          */
1873         if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
1874                 put_net(net);
1875                 return ERR_PTR(-EACCES);
1876         }
1877         return net;
1878 }
1879 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
1880
1881 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
1882                                       bool strict_check, struct nlattr **tb,
1883                                       struct netlink_ext_ack *extack)
1884 {
1885         int hdrlen;
1886
1887         if (strict_check) {
1888                 struct ifinfomsg *ifm;
1889
1890                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1891                         NL_SET_ERR_MSG(extack, "Invalid header for link dump");
1892                         return -EINVAL;
1893                 }
1894
1895                 ifm = nlmsg_data(nlh);
1896                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
1897                     ifm->ifi_change) {
1898                         NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
1899                         return -EINVAL;
1900                 }
1901                 if (ifm->ifi_index) {
1902                         NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
1903                         return -EINVAL;
1904                 }
1905
1906                 return nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
1907                                           ifla_policy, extack);
1908         }
1909
1910         /* A hack to preserve kernel<->userspace interface.
1911          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1912          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1913          * what iproute2 < v3.9.0 used.
1914          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1915          * attribute, its netlink message is shorter than struct ifinfomsg.
1916          */
1917         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
1918                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1919
1920         return nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, extack);
1921 }
1922
1923 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1924 {
1925         struct netlink_ext_ack *extack = cb->extack;
1926         const struct nlmsghdr *nlh = cb->nlh;
1927         struct net *net = sock_net(skb->sk);
1928         struct net *tgt_net = net;
1929         int h, s_h;
1930         int idx = 0, s_idx;
1931         struct net_device *dev;
1932         struct hlist_head *head;
1933         struct nlattr *tb[IFLA_MAX+1];
1934         u32 ext_filter_mask = 0;
1935         const struct rtnl_link_ops *kind_ops = NULL;
1936         unsigned int flags = NLM_F_MULTI;
1937         int master_idx = 0;
1938         int netnsid = -1;
1939         int err, i;
1940
1941         s_h = cb->args[0];
1942         s_idx = cb->args[1];
1943
1944         err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
1945         if (err < 0) {
1946                 if (cb->strict_check)
1947                         return err;
1948
1949                 goto walk_entries;
1950         }
1951
1952         for (i = 0; i <= IFLA_MAX; ++i) {
1953                 if (!tb[i])
1954                         continue;
1955
1956                 /* new attributes should only be added with strict checking */
1957                 switch (i) {
1958                 case IFLA_TARGET_NETNSID:
1959                         netnsid = nla_get_s32(tb[i]);
1960                         tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
1961                         if (IS_ERR(tgt_net)) {
1962                                 NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
1963                                 return PTR_ERR(tgt_net);
1964                         }
1965                         break;
1966                 case IFLA_EXT_MASK:
1967                         ext_filter_mask = nla_get_u32(tb[i]);
1968                         break;
1969                 case IFLA_MASTER:
1970                         master_idx = nla_get_u32(tb[i]);
1971                         break;
1972                 case IFLA_LINKINFO:
1973                         kind_ops = linkinfo_to_kind_ops(tb[i]);
1974                         break;
1975                 default:
1976                         if (cb->strict_check) {
1977                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
1978                                 return -EINVAL;
1979                         }
1980                 }
1981         }
1982
1983         if (master_idx || kind_ops)
1984                 flags |= NLM_F_DUMP_FILTERED;
1985
1986 walk_entries:
1987         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1988                 idx = 0;
1989                 head = &tgt_net->dev_index_head[h];
1990                 hlist_for_each_entry(dev, head, index_hlist) {
1991                         if (link_dump_filtered(dev, master_idx, kind_ops))
1992                                 goto cont;
1993                         if (idx < s_idx)
1994                                 goto cont;
1995                         err = rtnl_fill_ifinfo(skb, dev, net,
1996                                                RTM_NEWLINK,
1997                                                NETLINK_CB(cb->skb).portid,
1998                                                nlh->nlmsg_seq, 0, flags,
1999                                                ext_filter_mask, 0, NULL, 0,
2000                                                netnsid);
2001
2002                         if (err < 0) {
2003                                 if (likely(skb->len))
2004                                         goto out;
2005
2006                                 goto out_err;
2007                         }
2008 cont:
2009                         idx++;
2010                 }
2011         }
2012 out:
2013         err = skb->len;
2014 out_err:
2015         cb->args[1] = idx;
2016         cb->args[0] = h;
2017         cb->seq = net->dev_base_seq;
2018         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2019         if (netnsid >= 0)
2020                 put_net(tgt_net);
2021
2022         return err;
2023 }
2024
2025 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2026                         struct netlink_ext_ack *exterr)
2027 {
2028         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy, exterr);
2029 }
2030 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
2031
2032 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2033 {
2034         struct net *net;
2035         /* Examine the link attributes and figure out which
2036          * network namespace we are talking about.
2037          */
2038         if (tb[IFLA_NET_NS_PID])
2039                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2040         else if (tb[IFLA_NET_NS_FD])
2041                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2042         else
2043                 net = get_net(src_net);
2044         return net;
2045 }
2046 EXPORT_SYMBOL(rtnl_link_get_net);
2047
2048 /* Figure out which network namespace we are talking about by
2049  * examining the link attributes in the following order:
2050  *
2051  * 1. IFLA_NET_NS_PID
2052  * 2. IFLA_NET_NS_FD
2053  * 3. IFLA_TARGET_NETNSID
2054  */
2055 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2056                                                struct nlattr *tb[])
2057 {
2058         struct net *net;
2059
2060         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2061                 return rtnl_link_get_net(src_net, tb);
2062
2063         if (!tb[IFLA_TARGET_NETNSID])
2064                 return get_net(src_net);
2065
2066         net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2067         if (!net)
2068                 return ERR_PTR(-EINVAL);
2069
2070         return net;
2071 }
2072
2073 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2074                                              struct net *src_net,
2075                                              struct nlattr *tb[], int cap)
2076 {
2077         struct net *net;
2078
2079         net = rtnl_link_get_net_by_nlattr(src_net, tb);
2080         if (IS_ERR(net))
2081                 return net;
2082
2083         if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2084                 put_net(net);
2085                 return ERR_PTR(-EPERM);
2086         }
2087
2088         return net;
2089 }
2090
2091 /* Verify that rtnetlink requests do not pass additional properties
2092  * potentially referring to different network namespaces.
2093  */
2094 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2095                                     struct netlink_ext_ack *extack,
2096                                     bool netns_id_only)
2097 {
2098
2099         if (netns_id_only) {
2100                 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2101                         return 0;
2102
2103                 NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2104                 return -EOPNOTSUPP;
2105         }
2106
2107         if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2108                 goto invalid_attr;
2109
2110         if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2111                 goto invalid_attr;
2112
2113         if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2114                 goto invalid_attr;
2115
2116         return 0;
2117
2118 invalid_attr:
2119         NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2120         return -EINVAL;
2121 }
2122
2123 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
2124 {
2125         if (dev) {
2126                 if (tb[IFLA_ADDRESS] &&
2127                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2128                         return -EINVAL;
2129
2130                 if (tb[IFLA_BROADCAST] &&
2131                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2132                         return -EINVAL;
2133         }
2134
2135         if (tb[IFLA_AF_SPEC]) {
2136                 struct nlattr *af;
2137                 int rem, err;
2138
2139                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2140                         const struct rtnl_af_ops *af_ops;
2141
2142                         rcu_read_lock();
2143                         af_ops = rtnl_af_lookup(nla_type(af));
2144                         if (!af_ops) {
2145                                 rcu_read_unlock();
2146                                 return -EAFNOSUPPORT;
2147                         }
2148
2149                         if (!af_ops->set_link_af) {
2150                                 rcu_read_unlock();
2151                                 return -EOPNOTSUPP;
2152                         }
2153
2154                         if (af_ops->validate_link_af) {
2155                                 err = af_ops->validate_link_af(dev, af);
2156                                 if (err < 0) {
2157                                         rcu_read_unlock();
2158                                         return err;
2159                                 }
2160                         }
2161
2162                         rcu_read_unlock();
2163                 }
2164         }
2165
2166         return 0;
2167 }
2168
2169 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2170                                   int guid_type)
2171 {
2172         const struct net_device_ops *ops = dev->netdev_ops;
2173
2174         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2175 }
2176
2177 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2178 {
2179         if (dev->type != ARPHRD_INFINIBAND)
2180                 return -EOPNOTSUPP;
2181
2182         return handle_infiniband_guid(dev, ivt, guid_type);
2183 }
2184
2185 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2186 {
2187         const struct net_device_ops *ops = dev->netdev_ops;
2188         int err = -EINVAL;
2189
2190         if (tb[IFLA_VF_MAC]) {
2191                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2192
2193                 err = -EOPNOTSUPP;
2194                 if (ops->ndo_set_vf_mac)
2195                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
2196                                                   ivm->mac);
2197                 if (err < 0)
2198                         return err;
2199         }
2200
2201         if (tb[IFLA_VF_VLAN]) {
2202                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2203
2204                 err = -EOPNOTSUPP;
2205                 if (ops->ndo_set_vf_vlan)
2206                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2207                                                    ivv->qos,
2208                                                    htons(ETH_P_8021Q));
2209                 if (err < 0)
2210                         return err;
2211         }
2212
2213         if (tb[IFLA_VF_VLAN_LIST]) {
2214                 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2215                 struct nlattr *attr;
2216                 int rem, len = 0;
2217
2218                 err = -EOPNOTSUPP;
2219                 if (!ops->ndo_set_vf_vlan)
2220                         return err;
2221
2222                 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2223                         if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2224                             nla_len(attr) < NLA_HDRLEN) {
2225                                 return -EINVAL;
2226                         }
2227                         if (len >= MAX_VLAN_LIST_LEN)
2228                                 return -EOPNOTSUPP;
2229                         ivvl[len] = nla_data(attr);
2230
2231                         len++;
2232                 }
2233                 if (len == 0)
2234                         return -EINVAL;
2235
2236                 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2237                                            ivvl[0]->qos, ivvl[0]->vlan_proto);
2238                 if (err < 0)
2239                         return err;
2240         }
2241
2242         if (tb[IFLA_VF_TX_RATE]) {
2243                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2244                 struct ifla_vf_info ivf;
2245
2246                 err = -EOPNOTSUPP;
2247                 if (ops->ndo_get_vf_config)
2248                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2249                 if (err < 0)
2250                         return err;
2251
2252                 err = -EOPNOTSUPP;
2253                 if (ops->ndo_set_vf_rate)
2254                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2255                                                    ivf.min_tx_rate,
2256                                                    ivt->rate);
2257                 if (err < 0)
2258                         return err;
2259         }
2260
2261         if (tb[IFLA_VF_RATE]) {
2262                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2263
2264                 err = -EOPNOTSUPP;
2265                 if (ops->ndo_set_vf_rate)
2266                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2267                                                    ivt->min_tx_rate,
2268                                                    ivt->max_tx_rate);
2269                 if (err < 0)
2270                         return err;
2271         }
2272
2273         if (tb[IFLA_VF_SPOOFCHK]) {
2274                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2275
2276                 err = -EOPNOTSUPP;
2277                 if (ops->ndo_set_vf_spoofchk)
2278                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2279                                                        ivs->setting);
2280                 if (err < 0)
2281                         return err;
2282         }
2283
2284         if (tb[IFLA_VF_LINK_STATE]) {
2285                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2286
2287                 err = -EOPNOTSUPP;
2288                 if (ops->ndo_set_vf_link_state)
2289                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2290                                                          ivl->link_state);
2291                 if (err < 0)
2292                         return err;
2293         }
2294
2295         if (tb[IFLA_VF_RSS_QUERY_EN]) {
2296                 struct ifla_vf_rss_query_en *ivrssq_en;
2297
2298                 err = -EOPNOTSUPP;
2299                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2300                 if (ops->ndo_set_vf_rss_query_en)
2301                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2302                                                            ivrssq_en->setting);
2303                 if (err < 0)
2304                         return err;
2305         }
2306
2307         if (tb[IFLA_VF_TRUST]) {
2308                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2309
2310                 err = -EOPNOTSUPP;
2311                 if (ops->ndo_set_vf_trust)
2312                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2313                 if (err < 0)
2314                         return err;
2315         }
2316
2317         if (tb[IFLA_VF_IB_NODE_GUID]) {
2318                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2319
2320                 if (!ops->ndo_set_vf_guid)
2321                         return -EOPNOTSUPP;
2322
2323                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2324         }
2325
2326         if (tb[IFLA_VF_IB_PORT_GUID]) {
2327                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2328
2329                 if (!ops->ndo_set_vf_guid)
2330                         return -EOPNOTSUPP;
2331
2332                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2333         }
2334
2335         return err;
2336 }
2337
2338 static int do_set_master(struct net_device *dev, int ifindex,
2339                          struct netlink_ext_ack *extack)
2340 {
2341         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2342         const struct net_device_ops *ops;
2343         int err;
2344
2345         if (upper_dev) {
2346                 if (upper_dev->ifindex == ifindex)
2347                         return 0;
2348                 ops = upper_dev->netdev_ops;
2349                 if (ops->ndo_del_slave) {
2350                         err = ops->ndo_del_slave(upper_dev, dev);
2351                         if (err)
2352                                 return err;
2353                 } else {
2354                         return -EOPNOTSUPP;
2355                 }
2356         }
2357
2358         if (ifindex) {
2359                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2360                 if (!upper_dev)
2361                         return -EINVAL;
2362                 ops = upper_dev->netdev_ops;
2363                 if (ops->ndo_add_slave) {
2364                         err = ops->ndo_add_slave(upper_dev, dev, extack);
2365                         if (err)
2366                                 return err;
2367                 } else {
2368                         return -EOPNOTSUPP;
2369                 }
2370         }
2371         return 0;
2372 }
2373
2374 #define DO_SETLINK_MODIFIED     0x01
2375 /* notify flag means notify + modified. */
2376 #define DO_SETLINK_NOTIFY       0x03
2377 static int do_setlink(const struct sk_buff *skb,
2378                       struct net_device *dev, struct ifinfomsg *ifm,
2379                       struct netlink_ext_ack *extack,
2380                       struct nlattr **tb, char *ifname, int status)
2381 {
2382         const struct net_device_ops *ops = dev->netdev_ops;
2383         int err;
2384
2385         err = validate_linkmsg(dev, tb);
2386         if (err < 0)
2387                 return err;
2388
2389         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2390                 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev),
2391                                                             tb, CAP_NET_ADMIN);
2392                 if (IS_ERR(net)) {
2393                         err = PTR_ERR(net);
2394                         goto errout;
2395                 }
2396
2397                 err = dev_change_net_namespace(dev, net, ifname);
2398                 put_net(net);
2399                 if (err)
2400                         goto errout;
2401                 status |= DO_SETLINK_MODIFIED;
2402         }
2403
2404         if (tb[IFLA_MAP]) {
2405                 struct rtnl_link_ifmap *u_map;
2406                 struct ifmap k_map;
2407
2408                 if (!ops->ndo_set_config) {
2409                         err = -EOPNOTSUPP;
2410                         goto errout;
2411                 }
2412
2413                 if (!netif_device_present(dev)) {
2414                         err = -ENODEV;
2415                         goto errout;
2416                 }
2417
2418                 u_map = nla_data(tb[IFLA_MAP]);
2419                 k_map.mem_start = (unsigned long) u_map->mem_start;
2420                 k_map.mem_end = (unsigned long) u_map->mem_end;
2421                 k_map.base_addr = (unsigned short) u_map->base_addr;
2422                 k_map.irq = (unsigned char) u_map->irq;
2423                 k_map.dma = (unsigned char) u_map->dma;
2424                 k_map.port = (unsigned char) u_map->port;
2425
2426                 err = ops->ndo_set_config(dev, &k_map);
2427                 if (err < 0)
2428                         goto errout;
2429
2430                 status |= DO_SETLINK_NOTIFY;
2431         }
2432
2433         if (tb[IFLA_ADDRESS]) {
2434                 struct sockaddr *sa;
2435                 int len;
2436
2437                 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2438                                                   sizeof(*sa));
2439                 sa = kmalloc(len, GFP_KERNEL);
2440                 if (!sa) {
2441                         err = -ENOMEM;
2442                         goto errout;
2443                 }
2444                 sa->sa_family = dev->type;
2445                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2446                        dev->addr_len);
2447                 err = dev_set_mac_address(dev, sa, extack);
2448                 kfree(sa);
2449                 if (err)
2450                         goto errout;
2451                 status |= DO_SETLINK_MODIFIED;
2452         }
2453
2454         if (tb[IFLA_MTU]) {
2455                 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2456                 if (err < 0)
2457                         goto errout;
2458                 status |= DO_SETLINK_MODIFIED;
2459         }
2460
2461         if (tb[IFLA_GROUP]) {
2462                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2463                 status |= DO_SETLINK_NOTIFY;
2464         }
2465
2466         /*
2467          * Interface selected by interface index but interface
2468          * name provided implies that a name change has been
2469          * requested.
2470          */
2471         if (ifm->ifi_index > 0 && ifname[0]) {
2472                 err = dev_change_name(dev, ifname);
2473                 if (err < 0)
2474                         goto errout;
2475                 status |= DO_SETLINK_MODIFIED;
2476         }
2477
2478         if (tb[IFLA_IFALIAS]) {
2479                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2480                                     nla_len(tb[IFLA_IFALIAS]));
2481                 if (err < 0)
2482                         goto errout;
2483                 status |= DO_SETLINK_NOTIFY;
2484         }
2485
2486         if (tb[IFLA_BROADCAST]) {
2487                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2488                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2489         }
2490
2491         if (ifm->ifi_flags || ifm->ifi_change) {
2492                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2493                                        extack);
2494                 if (err < 0)
2495                         goto errout;
2496         }
2497
2498         if (tb[IFLA_MASTER]) {
2499                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2500                 if (err)
2501                         goto errout;
2502                 status |= DO_SETLINK_MODIFIED;
2503         }
2504
2505         if (tb[IFLA_CARRIER]) {
2506                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2507                 if (err)
2508                         goto errout;
2509                 status |= DO_SETLINK_MODIFIED;
2510         }
2511
2512         if (tb[IFLA_TXQLEN]) {
2513                 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2514
2515                 err = dev_change_tx_queue_len(dev, value);
2516                 if (err)
2517                         goto errout;
2518                 status |= DO_SETLINK_MODIFIED;
2519         }
2520
2521         if (tb[IFLA_GSO_MAX_SIZE]) {
2522                 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2523
2524                 if (max_size > GSO_MAX_SIZE) {
2525                         err = -EINVAL;
2526                         goto errout;
2527                 }
2528
2529                 if (dev->gso_max_size ^ max_size) {
2530                         netif_set_gso_max_size(dev, max_size);
2531                         status |= DO_SETLINK_MODIFIED;
2532                 }
2533         }
2534
2535         if (tb[IFLA_GSO_MAX_SEGS]) {
2536                 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2537
2538                 if (max_segs > GSO_MAX_SEGS) {
2539                         err = -EINVAL;
2540                         goto errout;
2541                 }
2542
2543                 if (dev->gso_max_segs ^ max_segs) {
2544                         dev->gso_max_segs = max_segs;
2545                         status |= DO_SETLINK_MODIFIED;
2546                 }
2547         }
2548
2549         if (tb[IFLA_OPERSTATE])
2550                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2551
2552         if (tb[IFLA_LINKMODE]) {
2553                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2554
2555                 write_lock_bh(&dev_base_lock);
2556                 if (dev->link_mode ^ value)
2557                         status |= DO_SETLINK_NOTIFY;
2558                 dev->link_mode = value;
2559                 write_unlock_bh(&dev_base_lock);
2560         }
2561
2562         if (tb[IFLA_VFINFO_LIST]) {
2563                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2564                 struct nlattr *attr;
2565                 int rem;
2566
2567                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2568                         if (nla_type(attr) != IFLA_VF_INFO ||
2569                             nla_len(attr) < NLA_HDRLEN) {
2570                                 err = -EINVAL;
2571                                 goto errout;
2572                         }
2573                         err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2574                                                ifla_vf_policy, NULL);
2575                         if (err < 0)
2576                                 goto errout;
2577                         err = do_setvfinfo(dev, vfinfo);
2578                         if (err < 0)
2579                                 goto errout;
2580                         status |= DO_SETLINK_NOTIFY;
2581                 }
2582         }
2583         err = 0;
2584
2585         if (tb[IFLA_VF_PORTS]) {
2586                 struct nlattr *port[IFLA_PORT_MAX+1];
2587                 struct nlattr *attr;
2588                 int vf;
2589                 int rem;
2590
2591                 err = -EOPNOTSUPP;
2592                 if (!ops->ndo_set_vf_port)
2593                         goto errout;
2594
2595                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2596                         if (nla_type(attr) != IFLA_VF_PORT ||
2597                             nla_len(attr) < NLA_HDRLEN) {
2598                                 err = -EINVAL;
2599                                 goto errout;
2600                         }
2601                         err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2602                                                ifla_port_policy, NULL);
2603                         if (err < 0)
2604                                 goto errout;
2605                         if (!port[IFLA_PORT_VF]) {
2606                                 err = -EOPNOTSUPP;
2607                                 goto errout;
2608                         }
2609                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2610                         err = ops->ndo_set_vf_port(dev, vf, port);
2611                         if (err < 0)
2612                                 goto errout;
2613                         status |= DO_SETLINK_NOTIFY;
2614                 }
2615         }
2616         err = 0;
2617
2618         if (tb[IFLA_PORT_SELF]) {
2619                 struct nlattr *port[IFLA_PORT_MAX+1];
2620
2621                 err = nla_parse_nested(port, IFLA_PORT_MAX,
2622                                        tb[IFLA_PORT_SELF], ifla_port_policy,
2623                                        NULL);
2624                 if (err < 0)
2625                         goto errout;
2626
2627                 err = -EOPNOTSUPP;
2628                 if (ops->ndo_set_vf_port)
2629                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2630                 if (err < 0)
2631                         goto errout;
2632                 status |= DO_SETLINK_NOTIFY;
2633         }
2634
2635         if (tb[IFLA_AF_SPEC]) {
2636                 struct nlattr *af;
2637                 int rem;
2638
2639                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2640                         const struct rtnl_af_ops *af_ops;
2641
2642                         rcu_read_lock();
2643
2644                         BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2645
2646                         err = af_ops->set_link_af(dev, af);
2647                         if (err < 0) {
2648                                 rcu_read_unlock();
2649                                 goto errout;
2650                         }
2651
2652                         rcu_read_unlock();
2653                         status |= DO_SETLINK_NOTIFY;
2654                 }
2655         }
2656         err = 0;
2657
2658         if (tb[IFLA_PROTO_DOWN]) {
2659                 err = dev_change_proto_down(dev,
2660                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2661                 if (err)
2662                         goto errout;
2663                 status |= DO_SETLINK_NOTIFY;
2664         }
2665
2666         if (tb[IFLA_XDP]) {
2667                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2668                 u32 xdp_flags = 0;
2669
2670                 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2671                                        ifla_xdp_policy, NULL);
2672                 if (err < 0)
2673                         goto errout;
2674
2675                 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2676                         err = -EINVAL;
2677                         goto errout;
2678                 }
2679
2680                 if (xdp[IFLA_XDP_FLAGS]) {
2681                         xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2682                         if (xdp_flags & ~XDP_FLAGS_MASK) {
2683                                 err = -EINVAL;
2684                                 goto errout;
2685                         }
2686                         if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2687                                 err = -EINVAL;
2688                                 goto errout;
2689                         }
2690                 }
2691
2692                 if (xdp[IFLA_XDP_FD]) {
2693                         err = dev_change_xdp_fd(dev, extack,
2694                                                 nla_get_s32(xdp[IFLA_XDP_FD]),
2695                                                 xdp_flags);
2696                         if (err)
2697                                 goto errout;
2698                         status |= DO_SETLINK_NOTIFY;
2699                 }
2700         }
2701
2702 errout:
2703         if (status & DO_SETLINK_MODIFIED) {
2704                 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2705                         netdev_state_change(dev);
2706
2707                 if (err < 0)
2708                         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",
2709                                              dev->name);
2710         }
2711
2712         return err;
2713 }
2714
2715 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2716                         struct netlink_ext_ack *extack)
2717 {
2718         struct net *net = sock_net(skb->sk);
2719         struct ifinfomsg *ifm;
2720         struct net_device *dev;
2721         int err;
2722         struct nlattr *tb[IFLA_MAX+1];
2723         char ifname[IFNAMSIZ];
2724
2725         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy,
2726                           extack);
2727         if (err < 0)
2728                 goto errout;
2729
2730         err = rtnl_ensure_unique_netns(tb, extack, false);
2731         if (err < 0)
2732                 goto errout;
2733
2734         if (tb[IFLA_IFNAME])
2735                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2736         else
2737                 ifname[0] = '\0';
2738
2739         err = -EINVAL;
2740         ifm = nlmsg_data(nlh);
2741         if (ifm->ifi_index > 0)
2742                 dev = __dev_get_by_index(net, ifm->ifi_index);
2743         else if (tb[IFLA_IFNAME])
2744                 dev = __dev_get_by_name(net, ifname);
2745         else
2746                 goto errout;
2747
2748         if (dev == NULL) {
2749                 err = -ENODEV;
2750                 goto errout;
2751         }
2752
2753         err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2754 errout:
2755         return err;
2756 }
2757
2758 static int rtnl_group_dellink(const struct net *net, int group)
2759 {
2760         struct net_device *dev, *aux;
2761         LIST_HEAD(list_kill);
2762         bool found = false;
2763
2764         if (!group)
2765                 return -EPERM;
2766
2767         for_each_netdev(net, dev) {
2768                 if (dev->group == group) {
2769                         const struct rtnl_link_ops *ops;
2770
2771                         found = true;
2772                         ops = dev->rtnl_link_ops;
2773                         if (!ops || !ops->dellink)
2774                                 return -EOPNOTSUPP;
2775                 }
2776         }
2777
2778         if (!found)
2779                 return -ENODEV;
2780
2781         for_each_netdev_safe(net, dev, aux) {
2782                 if (dev->group == group) {
2783                         const struct rtnl_link_ops *ops;
2784
2785                         ops = dev->rtnl_link_ops;
2786                         ops->dellink(dev, &list_kill);
2787                 }
2788         }
2789         unregister_netdevice_many(&list_kill);
2790
2791         return 0;
2792 }
2793
2794 int rtnl_delete_link(struct net_device *dev)
2795 {
2796         const struct rtnl_link_ops *ops;
2797         LIST_HEAD(list_kill);
2798
2799         ops = dev->rtnl_link_ops;
2800         if (!ops || !ops->dellink)
2801                 return -EOPNOTSUPP;
2802
2803         ops->dellink(dev, &list_kill);
2804         unregister_netdevice_many(&list_kill);
2805
2806         return 0;
2807 }
2808 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2809
2810 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2811                         struct netlink_ext_ack *extack)
2812 {
2813         struct net *net = sock_net(skb->sk);
2814         struct net *tgt_net = net;
2815         struct net_device *dev = NULL;
2816         struct ifinfomsg *ifm;
2817         char ifname[IFNAMSIZ];
2818         struct nlattr *tb[IFLA_MAX+1];
2819         int err;
2820         int netnsid = -1;
2821
2822         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2823         if (err < 0)
2824                 return err;
2825
2826         err = rtnl_ensure_unique_netns(tb, extack, true);
2827         if (err < 0)
2828                 return err;
2829
2830         if (tb[IFLA_IFNAME])
2831                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2832
2833         if (tb[IFLA_TARGET_NETNSID]) {
2834                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
2835                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
2836                 if (IS_ERR(tgt_net))
2837                         return PTR_ERR(tgt_net);
2838         }
2839
2840         err = -EINVAL;
2841         ifm = nlmsg_data(nlh);
2842         if (ifm->ifi_index > 0)
2843                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
2844         else if (tb[IFLA_IFNAME])
2845                 dev = __dev_get_by_name(tgt_net, ifname);
2846         else if (tb[IFLA_GROUP])
2847                 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
2848         else
2849                 goto out;
2850
2851         if (!dev) {
2852                 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
2853                         err = -ENODEV;
2854
2855                 goto out;
2856         }
2857
2858         err = rtnl_delete_link(dev);
2859
2860 out:
2861         if (netnsid >= 0)
2862                 put_net(tgt_net);
2863
2864         return err;
2865 }
2866
2867 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2868 {
2869         unsigned int old_flags;
2870         int err;
2871
2872         old_flags = dev->flags;
2873         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2874                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2875                                          NULL);
2876                 if (err < 0)
2877                         return err;
2878         }
2879
2880         if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
2881                 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
2882         } else {
2883                 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2884                 __dev_notify_flags(dev, old_flags, ~0U);
2885         }
2886         return 0;
2887 }
2888 EXPORT_SYMBOL(rtnl_configure_link);
2889
2890 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
2891                                     unsigned char name_assign_type,
2892                                     const struct rtnl_link_ops *ops,
2893                                     struct nlattr *tb[],
2894                                     struct netlink_ext_ack *extack)
2895 {
2896         struct net_device *dev;
2897         unsigned int num_tx_queues = 1;
2898         unsigned int num_rx_queues = 1;
2899
2900         if (tb[IFLA_NUM_TX_QUEUES])
2901                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2902         else if (ops->get_num_tx_queues)
2903                 num_tx_queues = ops->get_num_tx_queues();
2904
2905         if (tb[IFLA_NUM_RX_QUEUES])
2906                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2907         else if (ops->get_num_rx_queues)
2908                 num_rx_queues = ops->get_num_rx_queues();
2909
2910         if (num_tx_queues < 1 || num_tx_queues > 4096) {
2911                 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
2912                 return ERR_PTR(-EINVAL);
2913         }
2914
2915         if (num_rx_queues < 1 || num_rx_queues > 4096) {
2916                 NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
2917                 return ERR_PTR(-EINVAL);
2918         }
2919
2920         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2921                                ops->setup, num_tx_queues, num_rx_queues);
2922         if (!dev)
2923                 return ERR_PTR(-ENOMEM);
2924
2925         dev_net_set(dev, net);
2926         dev->rtnl_link_ops = ops;
2927         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2928
2929         if (tb[IFLA_MTU])
2930                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2931         if (tb[IFLA_ADDRESS]) {
2932                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2933                                 nla_len(tb[IFLA_ADDRESS]));
2934                 dev->addr_assign_type = NET_ADDR_SET;
2935         }
2936         if (tb[IFLA_BROADCAST])
2937                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2938                                 nla_len(tb[IFLA_BROADCAST]));
2939         if (tb[IFLA_TXQLEN])
2940                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2941         if (tb[IFLA_OPERSTATE])
2942                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2943         if (tb[IFLA_LINKMODE])
2944                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2945         if (tb[IFLA_GROUP])
2946                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2947         if (tb[IFLA_GSO_MAX_SIZE])
2948                 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
2949         if (tb[IFLA_GSO_MAX_SEGS])
2950                 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2951
2952         return dev;
2953 }
2954 EXPORT_SYMBOL(rtnl_create_link);
2955
2956 static int rtnl_group_changelink(const struct sk_buff *skb,
2957                 struct net *net, int group,
2958                 struct ifinfomsg *ifm,
2959                 struct netlink_ext_ack *extack,
2960                 struct nlattr **tb)
2961 {
2962         struct net_device *dev, *aux;
2963         int err;
2964
2965         for_each_netdev_safe(net, dev, aux) {
2966                 if (dev->group == group) {
2967                         err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
2968                         if (err < 0)
2969                                 return err;
2970                 }
2971         }
2972
2973         return 0;
2974 }
2975
2976 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2977                           struct nlattr **attr, struct netlink_ext_ack *extack)
2978 {
2979         struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
2980         unsigned char name_assign_type = NET_NAME_USER;
2981         struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
2982         const struct rtnl_link_ops *m_ops = NULL;
2983         struct net_device *master_dev = NULL;
2984         struct net *net = sock_net(skb->sk);
2985         const struct rtnl_link_ops *ops;
2986         struct nlattr *tb[IFLA_MAX + 1];
2987         struct net *dest_net, *link_net;
2988         struct nlattr **slave_data;
2989         char kind[MODULE_NAME_LEN];
2990         struct net_device *dev;
2991         struct ifinfomsg *ifm;
2992         char ifname[IFNAMSIZ];
2993         struct nlattr **data;
2994         int err;
2995
2996 #ifdef CONFIG_MODULES
2997 replay:
2998 #endif
2999         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3000         if (err < 0)
3001                 return err;
3002
3003         err = rtnl_ensure_unique_netns(tb, extack, false);
3004         if (err < 0)
3005                 return err;
3006
3007         if (tb[IFLA_IFNAME])
3008                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3009         else
3010                 ifname[0] = '\0';
3011
3012         ifm = nlmsg_data(nlh);
3013         if (ifm->ifi_index > 0)
3014                 dev = __dev_get_by_index(net, ifm->ifi_index);
3015         else {
3016                 if (ifname[0])
3017                         dev = __dev_get_by_name(net, ifname);
3018                 else
3019                         dev = NULL;
3020         }
3021
3022         if (dev) {
3023                 master_dev = netdev_master_upper_dev_get(dev);
3024                 if (master_dev)
3025                         m_ops = master_dev->rtnl_link_ops;
3026         }
3027
3028         err = validate_linkmsg(dev, tb);
3029         if (err < 0)
3030                 return err;
3031
3032         if (tb[IFLA_LINKINFO]) {
3033                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
3034                                        tb[IFLA_LINKINFO], ifla_info_policy,
3035                                        NULL);
3036                 if (err < 0)
3037                         return err;
3038         } else
3039                 memset(linkinfo, 0, sizeof(linkinfo));
3040
3041         if (linkinfo[IFLA_INFO_KIND]) {
3042                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3043                 ops = rtnl_link_ops_get(kind);
3044         } else {
3045                 kind[0] = '\0';
3046                 ops = NULL;
3047         }
3048
3049         data = NULL;
3050         if (ops) {
3051                 if (ops->maxtype > RTNL_MAX_TYPE)
3052                         return -EINVAL;
3053
3054                 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3055                         err = nla_parse_nested(attr, ops->maxtype,
3056                                                linkinfo[IFLA_INFO_DATA],
3057                                                ops->policy, extack);
3058                         if (err < 0)
3059                                 return err;
3060                         data = attr;
3061                 }
3062                 if (ops->validate) {
3063                         err = ops->validate(tb, data, extack);
3064                         if (err < 0)
3065                                 return err;
3066                 }
3067         }
3068
3069         slave_data = NULL;
3070         if (m_ops) {
3071                 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3072                         return -EINVAL;
3073
3074                 if (m_ops->slave_maxtype &&
3075                     linkinfo[IFLA_INFO_SLAVE_DATA]) {
3076                         err = nla_parse_nested(slave_attr, m_ops->slave_maxtype,
3077                                                linkinfo[IFLA_INFO_SLAVE_DATA],
3078                                                m_ops->slave_policy, extack);
3079                         if (err < 0)
3080                                 return err;
3081                         slave_data = slave_attr;
3082                 }
3083         }
3084
3085         if (dev) {
3086                 int status = 0;
3087
3088                 if (nlh->nlmsg_flags & NLM_F_EXCL)
3089                         return -EEXIST;
3090                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3091                         return -EOPNOTSUPP;
3092
3093                 if (linkinfo[IFLA_INFO_DATA]) {
3094                         if (!ops || ops != dev->rtnl_link_ops ||
3095                             !ops->changelink)
3096                                 return -EOPNOTSUPP;
3097
3098                         err = ops->changelink(dev, tb, data, extack);
3099                         if (err < 0)
3100                                 return err;
3101                         status |= DO_SETLINK_NOTIFY;
3102                 }
3103
3104                 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3105                         if (!m_ops || !m_ops->slave_changelink)
3106                                 return -EOPNOTSUPP;
3107
3108                         err = m_ops->slave_changelink(master_dev, dev, tb,
3109                                                       slave_data, extack);
3110                         if (err < 0)
3111                                 return err;
3112                         status |= DO_SETLINK_NOTIFY;
3113                 }
3114
3115                 return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
3116         }
3117
3118         if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3119                 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3120                         return rtnl_group_changelink(skb, net,
3121                                                 nla_get_u32(tb[IFLA_GROUP]),
3122                                                 ifm, extack, tb);
3123                 return -ENODEV;
3124         }
3125
3126         if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3127                 return -EOPNOTSUPP;
3128
3129         if (!ops) {
3130 #ifdef CONFIG_MODULES
3131                 if (kind[0]) {
3132                         __rtnl_unlock();
3133                         request_module("rtnl-link-%s", kind);
3134                         rtnl_lock();
3135                         ops = rtnl_link_ops_get(kind);
3136                         if (ops)
3137                                 goto replay;
3138                 }
3139 #endif
3140                 NL_SET_ERR_MSG(extack, "Unknown device type");
3141                 return -EOPNOTSUPP;
3142         }
3143
3144         if (!ops->setup)
3145                 return -EOPNOTSUPP;
3146
3147         if (!ifname[0]) {
3148                 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3149                 name_assign_type = NET_NAME_ENUM;
3150         }
3151
3152         dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3153         if (IS_ERR(dest_net))
3154                 return PTR_ERR(dest_net);
3155
3156         if (tb[IFLA_LINK_NETNSID]) {
3157                 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3158
3159                 link_net = get_net_ns_by_id(dest_net, id);
3160                 if (!link_net) {
3161                         NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3162                         err =  -EINVAL;
3163                         goto out;
3164                 }
3165                 err = -EPERM;
3166                 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3167                         goto out;
3168         } else {
3169                 link_net = NULL;
3170         }
3171
3172         dev = rtnl_create_link(link_net ? : dest_net, ifname,
3173                                name_assign_type, ops, tb, extack);
3174         if (IS_ERR(dev)) {
3175                 err = PTR_ERR(dev);
3176                 goto out;
3177         }
3178
3179         dev->ifindex = ifm->ifi_index;
3180
3181         if (ops->newlink) {
3182                 err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3183                 /* Drivers should call free_netdev() in ->destructor
3184                  * and unregister it on failure after registration
3185                  * so that device could be finally freed in rtnl_unlock.
3186                  */
3187                 if (err < 0) {
3188                         /* If device is not registered at all, free it now */
3189                         if (dev->reg_state == NETREG_UNINITIALIZED)
3190                                 free_netdev(dev);
3191                         goto out;
3192                 }
3193         } else {
3194                 err = register_netdevice(dev);
3195                 if (err < 0) {
3196                         free_netdev(dev);
3197                         goto out;
3198                 }
3199         }
3200         err = rtnl_configure_link(dev, ifm);
3201         if (err < 0)
3202                 goto out_unregister;
3203         if (link_net) {
3204                 err = dev_change_net_namespace(dev, dest_net, ifname);
3205                 if (err < 0)
3206                         goto out_unregister;
3207         }
3208         if (tb[IFLA_MASTER]) {
3209                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3210                 if (err)
3211                         goto out_unregister;
3212         }
3213 out:
3214         if (link_net)
3215                 put_net(link_net);
3216         put_net(dest_net);
3217         return err;
3218 out_unregister:
3219         if (ops->newlink) {
3220                 LIST_HEAD(list_kill);
3221
3222                 ops->dellink(dev, &list_kill);
3223                 unregister_netdevice_many(&list_kill);
3224         } else {
3225                 unregister_netdevice(dev);
3226         }
3227         goto out;
3228 }
3229
3230 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3231                         struct netlink_ext_ack *extack)
3232 {
3233         struct nlattr **attr;
3234         int ret;
3235
3236         attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
3237         if (!attr)
3238                 return -ENOMEM;
3239
3240         ret = __rtnl_newlink(skb, nlh, attr, extack);
3241         kfree(attr);
3242         return ret;
3243 }
3244
3245 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3246                         struct netlink_ext_ack *extack)
3247 {
3248         struct net *net = sock_net(skb->sk);
3249         struct net *tgt_net = net;
3250         struct ifinfomsg *ifm;
3251         char ifname[IFNAMSIZ];
3252         struct nlattr *tb[IFLA_MAX+1];
3253         struct net_device *dev = NULL;
3254         struct sk_buff *nskb;
3255         int netnsid = -1;
3256         int err;
3257         u32 ext_filter_mask = 0;
3258
3259         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3260         if (err < 0)
3261                 return err;
3262
3263         err = rtnl_ensure_unique_netns(tb, extack, true);
3264         if (err < 0)
3265                 return err;
3266
3267         if (tb[IFLA_TARGET_NETNSID]) {
3268                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3269                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3270                 if (IS_ERR(tgt_net))
3271                         return PTR_ERR(tgt_net);
3272         }
3273
3274         if (tb[IFLA_IFNAME])
3275                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3276
3277         if (tb[IFLA_EXT_MASK])
3278                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3279
3280         err = -EINVAL;
3281         ifm = nlmsg_data(nlh);
3282         if (ifm->ifi_index > 0)
3283                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3284         else if (tb[IFLA_IFNAME])
3285                 dev = __dev_get_by_name(tgt_net, ifname);
3286         else
3287                 goto out;
3288
3289         err = -ENODEV;
3290         if (dev == NULL)
3291                 goto out;
3292
3293         err = -ENOBUFS;
3294         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3295         if (nskb == NULL)
3296                 goto out;
3297
3298         err = rtnl_fill_ifinfo(nskb, dev, net,
3299                                RTM_NEWLINK, NETLINK_CB(skb).portid,
3300                                nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3301                                0, NULL, 0, netnsid);
3302         if (err < 0) {
3303                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3304                 WARN_ON(err == -EMSGSIZE);
3305                 kfree_skb(nskb);
3306         } else
3307                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3308 out:
3309         if (netnsid >= 0)
3310                 put_net(tgt_net);
3311
3312         return err;
3313 }
3314
3315 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3316 {
3317         struct net *net = sock_net(skb->sk);
3318         struct net_device *dev;
3319         struct nlattr *tb[IFLA_MAX+1];
3320         u32 ext_filter_mask = 0;
3321         u16 min_ifinfo_dump_size = 0;
3322         int hdrlen;
3323
3324         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3325         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3326                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3327
3328         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3329                 if (tb[IFLA_EXT_MASK])
3330                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3331         }
3332
3333         if (!ext_filter_mask)
3334                 return NLMSG_GOODSIZE;
3335         /*
3336          * traverse the list of net devices and compute the minimum
3337          * buffer size based upon the filter mask.
3338          */
3339         rcu_read_lock();
3340         for_each_netdev_rcu(net, dev) {
3341                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
3342                                              if_nlmsg_size(dev,
3343                                                            ext_filter_mask));
3344         }
3345         rcu_read_unlock();
3346
3347         return nlmsg_total_size(min_ifinfo_dump_size);
3348 }
3349
3350 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3351 {
3352         int idx;
3353         int s_idx = cb->family;
3354         int type = cb->nlh->nlmsg_type - RTM_BASE;
3355         int ret = 0;
3356
3357         if (s_idx == 0)
3358                 s_idx = 1;
3359
3360         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3361                 struct rtnl_link **tab;
3362                 struct rtnl_link *link;
3363                 rtnl_dumpit_func dumpit;
3364
3365                 if (idx < s_idx || idx == PF_PACKET)
3366                         continue;
3367
3368                 if (type < 0 || type >= RTM_NR_MSGTYPES)
3369                         continue;
3370
3371                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3372                 if (!tab)
3373                         continue;
3374
3375                 link = tab[type];
3376                 if (!link)
3377                         continue;
3378
3379                 dumpit = link->dumpit;
3380                 if (!dumpit)
3381                         continue;
3382
3383                 if (idx > s_idx) {
3384                         memset(&cb->args[0], 0, sizeof(cb->args));
3385                         cb->prev_seq = 0;
3386                         cb->seq = 0;
3387                 }
3388                 ret = dumpit(skb, cb);
3389                 if (ret)
3390                         break;
3391         }
3392         cb->family = idx;
3393
3394         return skb->len ? : ret;
3395 }
3396
3397 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3398                                        unsigned int change,
3399                                        u32 event, gfp_t flags, int *new_nsid,
3400                                        int new_ifindex)
3401 {
3402         struct net *net = dev_net(dev);
3403         struct sk_buff *skb;
3404         int err = -ENOBUFS;
3405         size_t if_info_size;
3406
3407         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3408         if (skb == NULL)
3409                 goto errout;
3410
3411         err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3412                                type, 0, 0, change, 0, 0, event,
3413                                new_nsid, new_ifindex, -1);
3414         if (err < 0) {
3415                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3416                 WARN_ON(err == -EMSGSIZE);
3417                 kfree_skb(skb);
3418                 goto errout;
3419         }
3420         return skb;
3421 errout:
3422         if (err < 0)
3423                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3424         return NULL;
3425 }
3426
3427 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3428 {
3429         struct net *net = dev_net(dev);
3430
3431         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3432 }
3433
3434 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3435                                unsigned int change, u32 event,
3436                                gfp_t flags, int *new_nsid, int new_ifindex)
3437 {
3438         struct sk_buff *skb;
3439
3440         if (dev->reg_state != NETREG_REGISTERED)
3441                 return;
3442
3443         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3444                                      new_ifindex);
3445         if (skb)
3446                 rtmsg_ifinfo_send(skb, dev, flags);
3447 }
3448
3449 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3450                   gfp_t flags)
3451 {
3452         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3453                            NULL, 0);
3454 }
3455
3456 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3457                          gfp_t flags, int *new_nsid, int new_ifindex)
3458 {
3459         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3460                            new_nsid, new_ifindex);
3461 }
3462
3463 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3464                                    struct net_device *dev,
3465                                    u8 *addr, u16 vid, u32 pid, u32 seq,
3466                                    int type, unsigned int flags,
3467                                    int nlflags, u16 ndm_state)
3468 {
3469         struct nlmsghdr *nlh;
3470         struct ndmsg *ndm;
3471
3472         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3473         if (!nlh)
3474                 return -EMSGSIZE;
3475
3476         ndm = nlmsg_data(nlh);
3477         ndm->ndm_family  = AF_BRIDGE;
3478         ndm->ndm_pad1    = 0;
3479         ndm->ndm_pad2    = 0;
3480         ndm->ndm_flags   = flags;
3481         ndm->ndm_type    = 0;
3482         ndm->ndm_ifindex = dev->ifindex;
3483         ndm->ndm_state   = ndm_state;
3484
3485         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3486                 goto nla_put_failure;
3487         if (vid)
3488                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3489                         goto nla_put_failure;
3490
3491         nlmsg_end(skb, nlh);
3492         return 0;
3493
3494 nla_put_failure:
3495         nlmsg_cancel(skb, nlh);
3496         return -EMSGSIZE;
3497 }
3498
3499 static inline size_t rtnl_fdb_nlmsg_size(void)
3500 {
3501         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3502                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
3503                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
3504                0;
3505 }
3506
3507 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3508                             u16 ndm_state)
3509 {
3510         struct net *net = dev_net(dev);
3511         struct sk_buff *skb;
3512         int err = -ENOBUFS;
3513
3514         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3515         if (!skb)
3516                 goto errout;
3517
3518         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3519                                       0, 0, type, NTF_SELF, 0, ndm_state);
3520         if (err < 0) {
3521                 kfree_skb(skb);
3522                 goto errout;
3523         }
3524
3525         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3526         return;
3527 errout:
3528         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3529 }
3530
3531 /**
3532  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3533  */
3534 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3535                      struct nlattr *tb[],
3536                      struct net_device *dev,
3537                      const unsigned char *addr, u16 vid,
3538                      u16 flags)
3539 {
3540         int err = -EINVAL;
3541
3542         /* If aging addresses are supported device will need to
3543          * implement its own handler for this.
3544          */
3545         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3546                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3547                 return err;
3548         }
3549
3550         if (vid) {
3551                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3552                 return err;
3553         }
3554
3555         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3556                 err = dev_uc_add_excl(dev, addr);
3557         else if (is_multicast_ether_addr(addr))
3558                 err = dev_mc_add_excl(dev, addr);
3559
3560         /* Only return duplicate errors if NLM_F_EXCL is set */
3561         if (err == -EEXIST && !(flags & NLM_F_EXCL))
3562                 err = 0;
3563
3564         return err;
3565 }
3566 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3567
3568 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3569                          struct netlink_ext_ack *extack)
3570 {
3571         u16 vid = 0;
3572
3573         if (vlan_attr) {
3574                 if (nla_len(vlan_attr) != sizeof(u16)) {
3575                         NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3576                         return -EINVAL;
3577                 }
3578
3579                 vid = nla_get_u16(vlan_attr);
3580
3581                 if (!vid || vid >= VLAN_VID_MASK) {
3582                         NL_SET_ERR_MSG(extack, "invalid vlan id");
3583                         return -EINVAL;
3584                 }
3585         }
3586         *p_vid = vid;
3587         return 0;
3588 }
3589
3590 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3591                         struct netlink_ext_ack *extack)
3592 {
3593         struct net *net = sock_net(skb->sk);
3594         struct ndmsg *ndm;
3595         struct nlattr *tb[NDA_MAX+1];
3596         struct net_device *dev;
3597         u8 *addr;
3598         u16 vid;
3599         int err;
3600
3601         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3602         if (err < 0)
3603                 return err;
3604
3605         ndm = nlmsg_data(nlh);
3606         if (ndm->ndm_ifindex == 0) {
3607                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3608                 return -EINVAL;
3609         }
3610
3611         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3612         if (dev == NULL) {
3613                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3614                 return -ENODEV;
3615         }
3616
3617         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3618                 NL_SET_ERR_MSG(extack, "invalid address");
3619                 return -EINVAL;
3620         }
3621
3622         if (dev->type != ARPHRD_ETHER) {
3623                 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
3624                 return -EINVAL;
3625         }
3626
3627         addr = nla_data(tb[NDA_LLADDR]);
3628
3629         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3630         if (err)
3631                 return err;
3632
3633         err = -EOPNOTSUPP;
3634
3635         /* Support fdb on master device the net/bridge default case */
3636         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3637             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3638                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3639                 const struct net_device_ops *ops = br_dev->netdev_ops;
3640
3641                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3642                                        nlh->nlmsg_flags);
3643                 if (err)
3644                         goto out;
3645                 else
3646                         ndm->ndm_flags &= ~NTF_MASTER;
3647         }
3648
3649         /* Embedded bridge, macvlan, and any other device support */
3650         if ((ndm->ndm_flags & NTF_SELF)) {
3651                 if (dev->netdev_ops->ndo_fdb_add)
3652                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3653                                                            vid,
3654                                                            nlh->nlmsg_flags);
3655                 else
3656                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3657                                                nlh->nlmsg_flags);
3658
3659                 if (!err) {
3660                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3661                                         ndm->ndm_state);
3662                         ndm->ndm_flags &= ~NTF_SELF;
3663                 }
3664         }
3665 out:
3666         return err;
3667 }
3668
3669 /**
3670  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3671  */
3672 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3673                      struct nlattr *tb[],
3674                      struct net_device *dev,
3675                      const unsigned char *addr, u16 vid)
3676 {
3677         int err = -EINVAL;
3678
3679         /* If aging addresses are supported device will need to
3680          * implement its own handler for this.
3681          */
3682         if (!(ndm->ndm_state & NUD_PERMANENT)) {
3683                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3684                 return err;
3685         }
3686
3687         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3688                 err = dev_uc_del(dev, addr);
3689         else if (is_multicast_ether_addr(addr))
3690                 err = dev_mc_del(dev, addr);
3691
3692         return err;
3693 }
3694 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3695
3696 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3697                         struct netlink_ext_ack *extack)
3698 {
3699         struct net *net = sock_net(skb->sk);
3700         struct ndmsg *ndm;
3701         struct nlattr *tb[NDA_MAX+1];
3702         struct net_device *dev;
3703         int err = -EINVAL;
3704         __u8 *addr;
3705         u16 vid;
3706
3707         if (!netlink_capable(skb, CAP_NET_ADMIN))
3708                 return -EPERM;
3709
3710         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3711         if (err < 0)
3712                 return err;
3713
3714         ndm = nlmsg_data(nlh);
3715         if (ndm->ndm_ifindex == 0) {
3716                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3717                 return -EINVAL;
3718         }
3719
3720         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3721         if (dev == NULL) {
3722                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3723                 return -ENODEV;
3724         }
3725
3726         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3727                 NL_SET_ERR_MSG(extack, "invalid address");
3728                 return -EINVAL;
3729         }
3730
3731         if (dev->type != ARPHRD_ETHER) {
3732                 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
3733                 return -EINVAL;
3734         }
3735
3736         addr = nla_data(tb[NDA_LLADDR]);
3737
3738         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3739         if (err)
3740                 return err;
3741
3742         err = -EOPNOTSUPP;
3743
3744         /* Support fdb on master device the net/bridge default case */
3745         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3746             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3747                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3748                 const struct net_device_ops *ops = br_dev->netdev_ops;
3749
3750                 if (ops->ndo_fdb_del)
3751                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3752
3753                 if (err)
3754                         goto out;
3755                 else
3756                         ndm->ndm_flags &= ~NTF_MASTER;
3757         }
3758
3759         /* Embedded bridge, macvlan, and any other device support */
3760         if (ndm->ndm_flags & NTF_SELF) {
3761                 if (dev->netdev_ops->ndo_fdb_del)
3762                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3763                                                            vid);
3764                 else
3765                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3766
3767                 if (!err) {
3768                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3769                                         ndm->ndm_state);
3770                         ndm->ndm_flags &= ~NTF_SELF;
3771                 }
3772         }
3773 out:
3774         return err;
3775 }
3776
3777 static int nlmsg_populate_fdb(struct sk_buff *skb,
3778                               struct netlink_callback *cb,
3779                               struct net_device *dev,
3780                               int *idx,
3781                               struct netdev_hw_addr_list *list)
3782 {
3783         struct netdev_hw_addr *ha;
3784         int err;
3785         u32 portid, seq;
3786
3787         portid = NETLINK_CB(cb->skb).portid;
3788         seq = cb->nlh->nlmsg_seq;
3789
3790         list_for_each_entry(ha, &list->list, list) {
3791                 if (*idx < cb->args[2])
3792                         goto skip;
3793
3794                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3795                                               portid, seq,
3796                                               RTM_NEWNEIGH, NTF_SELF,
3797                                               NLM_F_MULTI, NUD_PERMANENT);
3798                 if (err < 0)
3799                         return err;
3800 skip:
3801                 *idx += 1;
3802         }
3803         return 0;
3804 }
3805
3806 /**
3807  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3808  * @nlh: netlink message header
3809  * @dev: netdevice
3810  *
3811  * Default netdevice operation to dump the existing unicast address list.
3812  * Returns number of addresses from list put in skb.
3813  */
3814 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3815                       struct netlink_callback *cb,
3816                       struct net_device *dev,
3817                       struct net_device *filter_dev,
3818                       int *idx)
3819 {
3820         int err;
3821
3822         if (dev->type != ARPHRD_ETHER)
3823                 return -EINVAL;
3824
3825         netif_addr_lock_bh(dev);
3826         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3827         if (err)
3828                 goto out;
3829         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3830 out:
3831         netif_addr_unlock_bh(dev);
3832         return err;
3833 }
3834 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3835
3836 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
3837                                  int *br_idx, int *brport_idx,
3838                                  struct netlink_ext_ack *extack)
3839 {
3840         struct nlattr *tb[NDA_MAX + 1];
3841         struct ndmsg *ndm;
3842         int err, i;
3843
3844         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
3845                 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
3846                 return -EINVAL;
3847         }
3848
3849         ndm = nlmsg_data(nlh);
3850         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
3851             ndm->ndm_flags || ndm->ndm_type) {
3852                 NL_SET_ERR_MSG(extack, "Invalid values in header for fbd dump request");
3853                 return -EINVAL;
3854         }
3855
3856         err = nlmsg_parse_strict(nlh, sizeof(struct ndmsg), tb, NDA_MAX,
3857                                  NULL, extack);
3858         if (err < 0)
3859                 return err;
3860
3861         *brport_idx = ndm->ndm_ifindex;
3862         for (i = 0; i <= NDA_MAX; ++i) {
3863                 if (!tb[i])
3864                         continue;
3865
3866                 switch (i) {
3867                 case NDA_IFINDEX:
3868                         if (nla_len(tb[i]) != sizeof(u32)) {
3869                                 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
3870                                 return -EINVAL;
3871                         }
3872                         *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
3873                         break;
3874                 case NDA_MASTER:
3875                         if (nla_len(tb[i]) != sizeof(u32)) {
3876                                 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
3877                                 return -EINVAL;
3878                         }
3879                         *br_idx = nla_get_u32(tb[NDA_MASTER]);
3880                         break;
3881                 default:
3882                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
3883                         return -EINVAL;
3884                 }
3885         }
3886
3887         return 0;
3888 }
3889
3890 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
3891                                  int *br_idx, int *brport_idx,
3892                                  struct netlink_ext_ack *extack)
3893 {
3894         struct nlattr *tb[IFLA_MAX+1];
3895         int err;
3896
3897         /* A hack to preserve kernel<->userspace interface.
3898          * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
3899          * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
3900          * So, check for ndmsg with an optional u32 attribute (not used here).
3901          * Fortunately these sizes don't conflict with the size of ifinfomsg
3902          * with an optional attribute.
3903          */
3904         if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
3905             (nlmsg_len(nlh) != sizeof(struct ndmsg) +
3906              nla_attr_size(sizeof(u32)))) {
3907                 struct ifinfomsg *ifm;
3908
3909                 err = nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
3910                                   ifla_policy, extack);
3911                 if (err < 0) {
3912                         return -EINVAL;
3913                 } else if (err == 0) {
3914                         if (tb[IFLA_MASTER])
3915                                 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
3916                 }
3917
3918                 ifm = nlmsg_data(nlh);
3919                 *brport_idx = ifm->ifi_index;
3920         }
3921         return 0;
3922 }
3923
3924 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3925 {
3926         struct net_device *dev;
3927         struct net_device *br_dev = NULL;
3928         const struct net_device_ops *ops = NULL;
3929         const struct net_device_ops *cops = NULL;
3930         struct net *net = sock_net(skb->sk);
3931         struct hlist_head *head;
3932         int brport_idx = 0;
3933         int br_idx = 0;
3934         int h, s_h;
3935         int idx = 0, s_idx;
3936         int err = 0;
3937         int fidx = 0;
3938
3939         if (cb->strict_check)
3940                 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
3941                                             cb->extack);
3942         else
3943                 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
3944                                             cb->extack);
3945         if (err < 0)
3946                 return err;
3947
3948         if (br_idx) {
3949                 br_dev = __dev_get_by_index(net, br_idx);
3950                 if (!br_dev)
3951                         return -ENODEV;
3952
3953                 ops = br_dev->netdev_ops;
3954         }
3955
3956         s_h = cb->args[0];
3957         s_idx = cb->args[1];
3958
3959         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3960                 idx = 0;
3961                 head = &net->dev_index_head[h];
3962                 hlist_for_each_entry(dev, head, index_hlist) {
3963
3964                         if (brport_idx && (dev->ifindex != brport_idx))
3965                                 continue;
3966
3967                         if (!br_idx) { /* user did not specify a specific bridge */
3968                                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3969                                         br_dev = netdev_master_upper_dev_get(dev);
3970                                         cops = br_dev->netdev_ops;
3971                                 }
3972                         } else {
3973                                 if (dev != br_dev &&
3974                                     !(dev->priv_flags & IFF_BRIDGE_PORT))
3975                                         continue;
3976
3977                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
3978                                     !(dev->priv_flags & IFF_EBRIDGE))
3979                                         continue;
3980                                 cops = ops;
3981                         }
3982
3983                         if (idx < s_idx)
3984                                 goto cont;
3985
3986                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
3987                                 if (cops && cops->ndo_fdb_dump) {
3988                                         err = cops->ndo_fdb_dump(skb, cb,
3989                                                                 br_dev, dev,
3990                                                                 &fidx);
3991                                         if (err == -EMSGSIZE)
3992                                                 goto out;
3993                                 }
3994                         }
3995
3996                         if (dev->netdev_ops->ndo_fdb_dump)
3997                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
3998                                                                     dev, NULL,
3999                                                                     &fidx);
4000                         else
4001                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4002                                                         &fidx);
4003                         if (err == -EMSGSIZE)
4004                                 goto out;
4005
4006                         cops = NULL;
4007
4008                         /* reset fdb offset to 0 for rest of the interfaces */
4009                         cb->args[2] = 0;
4010                         fidx = 0;
4011 cont:
4012                         idx++;
4013                 }
4014         }
4015
4016 out:
4017         cb->args[0] = h;
4018         cb->args[1] = idx;
4019         cb->args[2] = fidx;
4020
4021         return skb->len;
4022 }
4023
4024 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4025                                 struct nlattr **tb, u8 *ndm_flags,
4026                                 int *br_idx, int *brport_idx, u8 **addr,
4027                                 u16 *vid, struct netlink_ext_ack *extack)
4028 {
4029         struct ndmsg *ndm;
4030         int err, i;
4031
4032         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4033                 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4034                 return -EINVAL;
4035         }
4036
4037         ndm = nlmsg_data(nlh);
4038         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4039             ndm->ndm_type) {
4040                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4041                 return -EINVAL;
4042         }
4043
4044         if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4045                 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4046                 return -EINVAL;
4047         }
4048
4049         err = nlmsg_parse_strict(nlh, sizeof(struct ndmsg), tb, NDA_MAX,
4050                                  nda_policy, extack);
4051         if (err < 0)
4052                 return err;
4053
4054         *ndm_flags = ndm->ndm_flags;
4055         *brport_idx = ndm->ndm_ifindex;
4056         for (i = 0; i <= NDA_MAX; ++i) {
4057                 if (!tb[i])
4058                         continue;
4059
4060                 switch (i) {
4061                 case NDA_MASTER:
4062                         *br_idx = nla_get_u32(tb[i]);
4063                         break;
4064                 case NDA_LLADDR:
4065                         if (nla_len(tb[i]) != ETH_ALEN) {
4066                                 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4067                                 return -EINVAL;
4068                         }
4069                         *addr = nla_data(tb[i]);
4070                         break;
4071                 case NDA_VLAN:
4072                         err = fdb_vid_parse(tb[i], vid, extack);
4073                         if (err)
4074                                 return err;
4075                         break;
4076                 case NDA_VNI:
4077                         break;
4078                 default:
4079                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4080                         return -EINVAL;
4081                 }
4082         }
4083
4084         return 0;
4085 }
4086
4087 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4088                         struct netlink_ext_ack *extack)
4089 {
4090         struct net_device *dev = NULL, *br_dev = NULL;
4091         const struct net_device_ops *ops = NULL;
4092         struct net *net = sock_net(in_skb->sk);
4093         struct nlattr *tb[NDA_MAX + 1];
4094         struct sk_buff *skb;
4095         int brport_idx = 0;
4096         u8 ndm_flags = 0;
4097         int br_idx = 0;
4098         u8 *addr = NULL;
4099         u16 vid = 0;
4100         int err;
4101
4102         err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4103                                    &brport_idx, &addr, &vid, extack);
4104         if (err < 0)
4105                 return err;
4106
4107         if (!addr) {
4108                 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4109                 return -EINVAL;
4110         }
4111
4112         if (brport_idx) {
4113                 dev = __dev_get_by_index(net, brport_idx);
4114                 if (!dev) {
4115                         NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4116                         return -ENODEV;
4117                 }
4118         }
4119
4120         if (br_idx) {
4121                 if (dev) {
4122                         NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4123                         return -EINVAL;
4124                 }
4125
4126                 br_dev = __dev_get_by_index(net, br_idx);
4127                 if (!br_dev) {
4128                         NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4129                         return -EINVAL;
4130                 }
4131                 ops = br_dev->netdev_ops;
4132         }
4133
4134         if (dev) {
4135                 if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4136                         if (!(dev->priv_flags & IFF_BRIDGE_PORT)) {
4137                                 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4138                                 return -EINVAL;
4139                         }
4140                         br_dev = netdev_master_upper_dev_get(dev);
4141                         if (!br_dev) {
4142                                 NL_SET_ERR_MSG(extack, "Master of device not found");
4143                                 return -EINVAL;
4144                         }
4145                         ops = br_dev->netdev_ops;
4146                 } else {
4147                         if (!(ndm_flags & NTF_SELF)) {
4148                                 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4149                                 return -EINVAL;
4150                         }
4151                         ops = dev->netdev_ops;
4152                 }
4153         }
4154
4155         if (!br_dev && !dev) {
4156                 NL_SET_ERR_MSG(extack, "No device specified");
4157                 return -ENODEV;
4158         }
4159
4160         if (!ops || !ops->ndo_fdb_get) {
4161                 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4162                 return -EOPNOTSUPP;
4163         }
4164
4165         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4166         if (!skb)
4167                 return -ENOBUFS;
4168
4169         if (br_dev)
4170                 dev = br_dev;
4171         err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4172                                NETLINK_CB(in_skb).portid,
4173                                nlh->nlmsg_seq, extack);
4174         if (err)
4175                 goto out;
4176
4177         return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4178 out:
4179         kfree_skb(skb);
4180         return err;
4181 }
4182
4183 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4184                                unsigned int attrnum, unsigned int flag)
4185 {
4186         if (mask & flag)
4187                 return nla_put_u8(skb, attrnum, !!(flags & flag));
4188         return 0;
4189 }
4190
4191 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4192                             struct net_device *dev, u16 mode,
4193                             u32 flags, u32 mask, int nlflags,
4194                             u32 filter_mask,
4195                             int (*vlan_fill)(struct sk_buff *skb,
4196                                              struct net_device *dev,
4197                                              u32 filter_mask))
4198 {
4199         struct nlmsghdr *nlh;
4200         struct ifinfomsg *ifm;
4201         struct nlattr *br_afspec;
4202         struct nlattr *protinfo;
4203         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4204         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4205         int err = 0;
4206
4207         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4208         if (nlh == NULL)
4209                 return -EMSGSIZE;
4210
4211         ifm = nlmsg_data(nlh);
4212         ifm->ifi_family = AF_BRIDGE;
4213         ifm->__ifi_pad = 0;
4214         ifm->ifi_type = dev->type;
4215         ifm->ifi_index = dev->ifindex;
4216         ifm->ifi_flags = dev_get_flags(dev);
4217         ifm->ifi_change = 0;
4218
4219
4220         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4221             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4222             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4223             (br_dev &&
4224              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4225             (dev->addr_len &&
4226              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4227             (dev->ifindex != dev_get_iflink(dev) &&
4228              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4229                 goto nla_put_failure;
4230
4231         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
4232         if (!br_afspec)
4233                 goto nla_put_failure;
4234
4235         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4236                 nla_nest_cancel(skb, br_afspec);
4237                 goto nla_put_failure;
4238         }
4239
4240         if (mode != BRIDGE_MODE_UNDEF) {
4241                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4242                         nla_nest_cancel(skb, br_afspec);
4243                         goto nla_put_failure;
4244                 }
4245         }
4246         if (vlan_fill) {
4247                 err = vlan_fill(skb, dev, filter_mask);
4248                 if (err) {
4249                         nla_nest_cancel(skb, br_afspec);
4250                         goto nla_put_failure;
4251                 }
4252         }
4253         nla_nest_end(skb, br_afspec);
4254
4255         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
4256         if (!protinfo)
4257                 goto nla_put_failure;
4258
4259         if (brport_nla_put_flag(skb, flags, mask,
4260                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4261             brport_nla_put_flag(skb, flags, mask,
4262                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4263             brport_nla_put_flag(skb, flags, mask,
4264                                 IFLA_BRPORT_FAST_LEAVE,
4265                                 BR_MULTICAST_FAST_LEAVE) ||
4266             brport_nla_put_flag(skb, flags, mask,
4267                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4268             brport_nla_put_flag(skb, flags, mask,
4269                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4270             brport_nla_put_flag(skb, flags, mask,
4271                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4272             brport_nla_put_flag(skb, flags, mask,
4273                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4274             brport_nla_put_flag(skb, flags, mask,
4275                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
4276                 nla_nest_cancel(skb, protinfo);
4277                 goto nla_put_failure;
4278         }
4279
4280         nla_nest_end(skb, protinfo);
4281
4282         nlmsg_end(skb, nlh);
4283         return 0;
4284 nla_put_failure:
4285         nlmsg_cancel(skb, nlh);
4286         return err ? err : -EMSGSIZE;
4287 }
4288 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4289
4290 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4291                                     bool strict_check, u32 *filter_mask,
4292                                     struct netlink_ext_ack *extack)
4293 {
4294         struct nlattr *tb[IFLA_MAX+1];
4295         int err, i;
4296
4297         if (strict_check) {
4298                 struct ifinfomsg *ifm;
4299
4300                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4301                         NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4302                         return -EINVAL;
4303                 }
4304
4305                 ifm = nlmsg_data(nlh);
4306                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4307                     ifm->ifi_change || ifm->ifi_index) {
4308                         NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4309                         return -EINVAL;
4310                 }
4311
4312                 err = nlmsg_parse_strict(nlh, sizeof(struct ifinfomsg), tb,
4313                                          IFLA_MAX, ifla_policy, extack);
4314         } else {
4315                 err = nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb,
4316                                   IFLA_MAX, ifla_policy, extack);
4317         }
4318         if (err < 0)
4319                 return err;
4320
4321         /* new attributes should only be added with strict checking */
4322         for (i = 0; i <= IFLA_MAX; ++i) {
4323                 if (!tb[i])
4324                         continue;
4325
4326                 switch (i) {
4327                 case IFLA_EXT_MASK:
4328                         *filter_mask = nla_get_u32(tb[i]);
4329                         break;
4330                 default:
4331                         if (strict_check) {
4332                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4333                                 return -EINVAL;
4334                         }
4335                 }
4336         }
4337
4338         return 0;
4339 }
4340
4341 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4342 {
4343         const struct nlmsghdr *nlh = cb->nlh;
4344         struct net *net = sock_net(skb->sk);
4345         struct net_device *dev;
4346         int idx = 0;
4347         u32 portid = NETLINK_CB(cb->skb).portid;
4348         u32 seq = nlh->nlmsg_seq;
4349         u32 filter_mask = 0;
4350         int err;
4351
4352         err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4353                                        cb->extack);
4354         if (err < 0 && cb->strict_check)
4355                 return err;
4356
4357         rcu_read_lock();
4358         for_each_netdev_rcu(net, dev) {
4359                 const struct net_device_ops *ops = dev->netdev_ops;
4360                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4361
4362                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4363                         if (idx >= cb->args[0]) {
4364                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
4365                                                 skb, portid, seq, dev,
4366                                                 filter_mask, NLM_F_MULTI);
4367                                 if (err < 0 && err != -EOPNOTSUPP) {
4368                                         if (likely(skb->len))
4369                                                 break;
4370
4371                                         goto out_err;
4372                                 }
4373                         }
4374                         idx++;
4375                 }
4376
4377                 if (ops->ndo_bridge_getlink) {
4378                         if (idx >= cb->args[0]) {
4379                                 err = ops->ndo_bridge_getlink(skb, portid,
4380                                                               seq, dev,
4381                                                               filter_mask,
4382                                                               NLM_F_MULTI);
4383                                 if (err < 0 && err != -EOPNOTSUPP) {
4384                                         if (likely(skb->len))
4385                                                 break;
4386
4387                                         goto out_err;
4388                                 }
4389                         }
4390                         idx++;
4391                 }
4392         }
4393         err = skb->len;
4394 out_err:
4395         rcu_read_unlock();
4396         cb->args[0] = idx;
4397
4398         return err;
4399 }
4400
4401 static inline size_t bridge_nlmsg_size(void)
4402 {
4403         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4404                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
4405                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
4406                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
4407                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
4408                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
4409                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
4410                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
4411                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
4412                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
4413                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
4414 }
4415
4416 static int rtnl_bridge_notify(struct net_device *dev)
4417 {
4418         struct net *net = dev_net(dev);
4419         struct sk_buff *skb;
4420         int err = -EOPNOTSUPP;
4421
4422         if (!dev->netdev_ops->ndo_bridge_getlink)
4423                 return 0;
4424
4425         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4426         if (!skb) {
4427                 err = -ENOMEM;
4428                 goto errout;
4429         }
4430
4431         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4432         if (err < 0)
4433                 goto errout;
4434
4435         if (!skb->len)
4436                 goto errout;
4437
4438         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4439         return 0;
4440 errout:
4441         WARN_ON(err == -EMSGSIZE);
4442         kfree_skb(skb);
4443         if (err)
4444                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4445         return err;
4446 }
4447
4448 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4449                                struct netlink_ext_ack *extack)
4450 {
4451         struct net *net = sock_net(skb->sk);
4452         struct ifinfomsg *ifm;
4453         struct net_device *dev;
4454         struct nlattr *br_spec, *attr = NULL;
4455         int rem, err = -EOPNOTSUPP;
4456         u16 flags = 0;
4457         bool have_flags = false;
4458
4459         if (nlmsg_len(nlh) < sizeof(*ifm))
4460                 return -EINVAL;
4461
4462         ifm = nlmsg_data(nlh);
4463         if (ifm->ifi_family != AF_BRIDGE)
4464                 return -EPFNOSUPPORT;
4465
4466         dev = __dev_get_by_index(net, ifm->ifi_index);
4467         if (!dev) {
4468                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4469                 return -ENODEV;
4470         }
4471
4472         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4473         if (br_spec) {
4474                 nla_for_each_nested(attr, br_spec, rem) {
4475                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4476                                 if (nla_len(attr) < sizeof(flags))
4477                                         return -EINVAL;
4478
4479                                 have_flags = true;
4480                                 flags = nla_get_u16(attr);
4481                                 break;
4482                         }
4483                 }
4484         }
4485
4486         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4487                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4488
4489                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4490                         err = -EOPNOTSUPP;
4491                         goto out;
4492                 }
4493
4494                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
4495                                                              extack);
4496                 if (err)
4497                         goto out;
4498
4499                 flags &= ~BRIDGE_FLAGS_MASTER;
4500         }
4501
4502         if ((flags & BRIDGE_FLAGS_SELF)) {
4503                 if (!dev->netdev_ops->ndo_bridge_setlink)
4504                         err = -EOPNOTSUPP;
4505                 else
4506                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4507                                                                   flags,
4508                                                                   extack);
4509                 if (!err) {
4510                         flags &= ~BRIDGE_FLAGS_SELF;
4511
4512                         /* Generate event to notify upper layer of bridge
4513                          * change
4514                          */
4515                         err = rtnl_bridge_notify(dev);
4516                 }
4517         }
4518
4519         if (have_flags)
4520                 memcpy(nla_data(attr), &flags, sizeof(flags));
4521 out:
4522         return err;
4523 }
4524
4525 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4526                                struct netlink_ext_ack *extack)
4527 {
4528         struct net *net = sock_net(skb->sk);
4529         struct ifinfomsg *ifm;
4530         struct net_device *dev;
4531         struct nlattr *br_spec, *attr = NULL;
4532         int rem, err = -EOPNOTSUPP;
4533         u16 flags = 0;
4534         bool have_flags = false;
4535
4536         if (nlmsg_len(nlh) < sizeof(*ifm))
4537                 return -EINVAL;
4538
4539         ifm = nlmsg_data(nlh);
4540         if (ifm->ifi_family != AF_BRIDGE)
4541                 return -EPFNOSUPPORT;
4542
4543         dev = __dev_get_by_index(net, ifm->ifi_index);
4544         if (!dev) {
4545                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4546                 return -ENODEV;
4547         }
4548
4549         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4550         if (br_spec) {
4551                 nla_for_each_nested(attr, br_spec, rem) {
4552                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4553                                 if (nla_len(attr) < sizeof(flags))
4554                                         return -EINVAL;
4555
4556                                 have_flags = true;
4557                                 flags = nla_get_u16(attr);
4558                                 break;
4559                         }
4560                 }
4561         }
4562
4563         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4564                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4565
4566                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4567                         err = -EOPNOTSUPP;
4568                         goto out;
4569                 }
4570
4571                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4572                 if (err)
4573                         goto out;
4574
4575                 flags &= ~BRIDGE_FLAGS_MASTER;
4576         }
4577
4578         if ((flags & BRIDGE_FLAGS_SELF)) {
4579                 if (!dev->netdev_ops->ndo_bridge_dellink)
4580                         err = -EOPNOTSUPP;
4581                 else
4582                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
4583                                                                   flags);
4584
4585                 if (!err) {
4586                         flags &= ~BRIDGE_FLAGS_SELF;
4587
4588                         /* Generate event to notify upper layer of bridge
4589                          * change
4590                          */
4591                         err = rtnl_bridge_notify(dev);
4592                 }
4593         }
4594
4595         if (have_flags)
4596                 memcpy(nla_data(attr), &flags, sizeof(flags));
4597 out:
4598         return err;
4599 }
4600
4601 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
4602 {
4603         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
4604                (!idxattr || idxattr == attrid);
4605 }
4606
4607 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
4608 static int rtnl_get_offload_stats_attr_size(int attr_id)
4609 {
4610         switch (attr_id) {
4611         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
4612                 return sizeof(struct rtnl_link_stats64);
4613         }
4614
4615         return 0;
4616 }
4617
4618 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
4619                                   int *prividx)
4620 {
4621         struct nlattr *attr = NULL;
4622         int attr_id, size;
4623         void *attr_data;
4624         int err;
4625
4626         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4627               dev->netdev_ops->ndo_get_offload_stats))
4628                 return -ENODATA;
4629
4630         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4631              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4632                 if (attr_id < *prividx)
4633                         continue;
4634
4635                 size = rtnl_get_offload_stats_attr_size(attr_id);
4636                 if (!size)
4637                         continue;
4638
4639                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4640                         continue;
4641
4642                 attr = nla_reserve_64bit(skb, attr_id, size,
4643                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
4644                 if (!attr)
4645                         goto nla_put_failure;
4646
4647                 attr_data = nla_data(attr);
4648                 memset(attr_data, 0, size);
4649                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
4650                                                              attr_data);
4651                 if (err)
4652                         goto get_offload_stats_failure;
4653         }
4654
4655         if (!attr)
4656                 return -ENODATA;
4657
4658         *prividx = 0;
4659         return 0;
4660
4661 nla_put_failure:
4662         err = -EMSGSIZE;
4663 get_offload_stats_failure:
4664         *prividx = attr_id;
4665         return err;
4666 }
4667
4668 static int rtnl_get_offload_stats_size(const struct net_device *dev)
4669 {
4670         int nla_size = 0;
4671         int attr_id;
4672         int size;
4673
4674         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4675               dev->netdev_ops->ndo_get_offload_stats))
4676                 return 0;
4677
4678         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4679              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4680                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4681                         continue;
4682                 size = rtnl_get_offload_stats_attr_size(attr_id);
4683                 nla_size += nla_total_size_64bit(size);
4684         }
4685
4686         if (nla_size != 0)
4687                 nla_size += nla_total_size(0);
4688
4689         return nla_size;
4690 }
4691
4692 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
4693                                int type, u32 pid, u32 seq, u32 change,
4694                                unsigned int flags, unsigned int filter_mask,
4695                                int *idxattr, int *prividx)
4696 {
4697         struct if_stats_msg *ifsm;
4698         struct nlmsghdr *nlh;
4699         struct nlattr *attr;
4700         int s_prividx = *prividx;
4701         int err;
4702
4703         ASSERT_RTNL();
4704
4705         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
4706         if (!nlh)
4707                 return -EMSGSIZE;
4708
4709         ifsm = nlmsg_data(nlh);
4710         ifsm->family = PF_UNSPEC;
4711         ifsm->pad1 = 0;
4712         ifsm->pad2 = 0;
4713         ifsm->ifindex = dev->ifindex;
4714         ifsm->filter_mask = filter_mask;
4715
4716         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
4717                 struct rtnl_link_stats64 *sp;
4718
4719                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
4720                                          sizeof(struct rtnl_link_stats64),
4721                                          IFLA_STATS_UNSPEC);
4722                 if (!attr)
4723                         goto nla_put_failure;
4724
4725                 sp = nla_data(attr);
4726                 dev_get_stats(dev, sp);
4727         }
4728
4729         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
4730                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4731
4732                 if (ops && ops->fill_linkxstats) {
4733                         *idxattr = IFLA_STATS_LINK_XSTATS;
4734                         attr = nla_nest_start(skb,
4735                                               IFLA_STATS_LINK_XSTATS);
4736                         if (!attr)
4737                                 goto nla_put_failure;
4738
4739                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4740                         nla_nest_end(skb, attr);
4741                         if (err)
4742                                 goto nla_put_failure;
4743                         *idxattr = 0;
4744                 }
4745         }
4746
4747         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
4748                              *idxattr)) {
4749                 const struct rtnl_link_ops *ops = NULL;
4750                 const struct net_device *master;
4751
4752                 master = netdev_master_upper_dev_get(dev);
4753                 if (master)
4754                         ops = master->rtnl_link_ops;
4755                 if (ops && ops->fill_linkxstats) {
4756                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
4757                         attr = nla_nest_start(skb,
4758                                               IFLA_STATS_LINK_XSTATS_SLAVE);
4759                         if (!attr)
4760                                 goto nla_put_failure;
4761
4762                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4763                         nla_nest_end(skb, attr);
4764                         if (err)
4765                                 goto nla_put_failure;
4766                         *idxattr = 0;
4767                 }
4768         }
4769
4770         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
4771                              *idxattr)) {
4772                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
4773                 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
4774                 if (!attr)
4775                         goto nla_put_failure;
4776
4777                 err = rtnl_get_offload_stats(skb, dev, prividx);
4778                 if (err == -ENODATA)
4779                         nla_nest_cancel(skb, attr);
4780                 else
4781                         nla_nest_end(skb, attr);
4782
4783                 if (err && err != -ENODATA)
4784                         goto nla_put_failure;
4785                 *idxattr = 0;
4786         }
4787
4788         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
4789                 struct rtnl_af_ops *af_ops;
4790
4791                 *idxattr = IFLA_STATS_AF_SPEC;
4792                 attr = nla_nest_start(skb, IFLA_STATS_AF_SPEC);
4793                 if (!attr)
4794                         goto nla_put_failure;
4795
4796                 rcu_read_lock();
4797                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4798                         if (af_ops->fill_stats_af) {
4799                                 struct nlattr *af;
4800                                 int err;
4801
4802                                 af = nla_nest_start(skb, af_ops->family);
4803                                 if (!af) {
4804                                         rcu_read_unlock();
4805                                         goto nla_put_failure;
4806                                 }
4807                                 err = af_ops->fill_stats_af(skb, dev);
4808
4809                                 if (err == -ENODATA) {
4810                                         nla_nest_cancel(skb, af);
4811                                 } else if (err < 0) {
4812                                         rcu_read_unlock();
4813                                         goto nla_put_failure;
4814                                 }
4815
4816                                 nla_nest_end(skb, af);
4817                         }
4818                 }
4819                 rcu_read_unlock();
4820
4821                 nla_nest_end(skb, attr);
4822
4823                 *idxattr = 0;
4824         }
4825
4826         nlmsg_end(skb, nlh);
4827
4828         return 0;
4829
4830 nla_put_failure:
4831         /* not a multi message or no progress mean a real error */
4832         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
4833                 nlmsg_cancel(skb, nlh);
4834         else
4835                 nlmsg_end(skb, nlh);
4836
4837         return -EMSGSIZE;
4838 }
4839
4840 static size_t if_nlmsg_stats_size(const struct net_device *dev,
4841                                   u32 filter_mask)
4842 {
4843         size_t size = 0;
4844
4845         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
4846                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
4847
4848         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
4849                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4850                 int attr = IFLA_STATS_LINK_XSTATS;
4851
4852                 if (ops && ops->get_linkxstats_size) {
4853                         size += nla_total_size(ops->get_linkxstats_size(dev,
4854                                                                         attr));
4855                         /* for IFLA_STATS_LINK_XSTATS */
4856                         size += nla_total_size(0);
4857                 }
4858         }
4859
4860         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
4861                 struct net_device *_dev = (struct net_device *)dev;
4862                 const struct rtnl_link_ops *ops = NULL;
4863                 const struct net_device *master;
4864
4865                 /* netdev_master_upper_dev_get can't take const */
4866                 master = netdev_master_upper_dev_get(_dev);
4867                 if (master)
4868                         ops = master->rtnl_link_ops;
4869                 if (ops && ops->get_linkxstats_size) {
4870                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
4871
4872                         size += nla_total_size(ops->get_linkxstats_size(dev,
4873                                                                         attr));
4874                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
4875                         size += nla_total_size(0);
4876                 }
4877         }
4878
4879         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
4880                 size += rtnl_get_offload_stats_size(dev);
4881
4882         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
4883                 struct rtnl_af_ops *af_ops;
4884
4885                 /* for IFLA_STATS_AF_SPEC */
4886                 size += nla_total_size(0);
4887
4888                 rcu_read_lock();
4889                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4890                         if (af_ops->get_stats_af_size) {
4891                                 size += nla_total_size(
4892                                         af_ops->get_stats_af_size(dev));
4893
4894                                 /* for AF_* */
4895                                 size += nla_total_size(0);
4896                         }
4897                 }
4898                 rcu_read_unlock();
4899         }
4900
4901         return size;
4902 }
4903
4904 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
4905                           struct netlink_ext_ack *extack)
4906 {
4907         struct net *net = sock_net(skb->sk);
4908         struct net_device *dev = NULL;
4909         int idxattr = 0, prividx = 0;
4910         struct if_stats_msg *ifsm;
4911         struct sk_buff *nskb;
4912         u32 filter_mask;
4913         int err;
4914
4915         if (nlmsg_len(nlh) < sizeof(*ifsm))
4916                 return -EINVAL;
4917
4918         ifsm = nlmsg_data(nlh);
4919         if (ifsm->ifindex > 0)
4920                 dev = __dev_get_by_index(net, ifsm->ifindex);
4921         else
4922                 return -EINVAL;
4923
4924         if (!dev)
4925                 return -ENODEV;
4926
4927         filter_mask = ifsm->filter_mask;
4928         if (!filter_mask)
4929                 return -EINVAL;
4930
4931         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
4932         if (!nskb)
4933                 return -ENOBUFS;
4934
4935         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
4936                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
4937                                   0, filter_mask, &idxattr, &prividx);
4938         if (err < 0) {
4939                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
4940                 WARN_ON(err == -EMSGSIZE);
4941                 kfree_skb(nskb);
4942         } else {
4943                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
4944         }
4945
4946         return err;
4947 }
4948
4949 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
4950 {
4951         struct netlink_ext_ack *extack = cb->extack;
4952         int h, s_h, err, s_idx, s_idxattr, s_prividx;
4953         struct net *net = sock_net(skb->sk);
4954         unsigned int flags = NLM_F_MULTI;
4955         struct if_stats_msg *ifsm;
4956         struct hlist_head *head;
4957         struct net_device *dev;
4958         u32 filter_mask = 0;
4959         int idx = 0;
4960
4961         s_h = cb->args[0];
4962         s_idx = cb->args[1];
4963         s_idxattr = cb->args[2];
4964         s_prividx = cb->args[3];
4965
4966         cb->seq = net->dev_base_seq;
4967
4968         if (nlmsg_len(cb->nlh) < sizeof(*ifsm)) {
4969                 NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
4970                 return -EINVAL;
4971         }
4972
4973         ifsm = nlmsg_data(cb->nlh);
4974
4975         /* only requests using strict checks can pass data to influence
4976          * the dump. The legacy exception is filter_mask.
4977          */
4978         if (cb->strict_check) {
4979                 if (ifsm->pad1 || ifsm->pad2 || ifsm->ifindex) {
4980                         NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
4981                         return -EINVAL;
4982                 }
4983                 if (nlmsg_attrlen(cb->nlh, sizeof(*ifsm))) {
4984                         NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
4985                         return -EINVAL;
4986                 }
4987         }
4988
4989         filter_mask = ifsm->filter_mask;
4990         if (!filter_mask) {
4991                 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
4992                 return -EINVAL;
4993         }
4994
4995         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4996                 idx = 0;
4997                 head = &net->dev_index_head[h];
4998                 hlist_for_each_entry(dev, head, index_hlist) {
4999                         if (idx < s_idx)
5000                                 goto cont;
5001                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5002                                                   NETLINK_CB(cb->skb).portid,
5003                                                   cb->nlh->nlmsg_seq, 0,
5004                                                   flags, filter_mask,
5005                                                   &s_idxattr, &s_prividx);
5006                         /* If we ran out of room on the first message,
5007                          * we're in trouble
5008                          */
5009                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5010
5011                         if (err < 0)
5012                                 goto out;
5013                         s_prividx = 0;
5014                         s_idxattr = 0;
5015                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5016 cont:
5017                         idx++;
5018                 }
5019         }
5020 out:
5021         cb->args[3] = s_prividx;
5022         cb->args[2] = s_idxattr;
5023         cb->args[1] = idx;
5024         cb->args[0] = h;
5025
5026         return skb->len;
5027 }
5028
5029 /* Process one rtnetlink message. */
5030
5031 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5032                              struct netlink_ext_ack *extack)
5033 {
5034         struct net *net = sock_net(skb->sk);
5035         struct rtnl_link *link;
5036         struct module *owner;
5037         int err = -EOPNOTSUPP;
5038         rtnl_doit_func doit;
5039         unsigned int flags;
5040         int kind;
5041         int family;
5042         int type;
5043
5044         type = nlh->nlmsg_type;
5045         if (type > RTM_MAX)
5046                 return -EOPNOTSUPP;
5047
5048         type -= RTM_BASE;
5049
5050         /* All the messages must have at least 1 byte length */
5051         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
5052                 return 0;
5053
5054         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
5055         kind = type&3;
5056
5057         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
5058                 return -EPERM;
5059
5060         rcu_read_lock();
5061         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
5062                 struct sock *rtnl;
5063                 rtnl_dumpit_func dumpit;
5064                 u16 min_dump_alloc = 0;
5065
5066                 link = rtnl_get_link(family, type);
5067                 if (!link || !link->dumpit) {
5068                         family = PF_UNSPEC;
5069                         link = rtnl_get_link(family, type);
5070                         if (!link || !link->dumpit)
5071                                 goto err_unlock;
5072                 }
5073                 owner = link->owner;
5074                 dumpit = link->dumpit;
5075
5076                 if (type == RTM_GETLINK - RTM_BASE)
5077                         min_dump_alloc = rtnl_calcit(skb, nlh);
5078
5079                 err = 0;
5080                 /* need to do this before rcu_read_unlock() */
5081                 if (!try_module_get(owner))
5082                         err = -EPROTONOSUPPORT;
5083
5084                 rcu_read_unlock();
5085
5086                 rtnl = net->rtnl;
5087                 if (err == 0) {
5088                         struct netlink_dump_control c = {
5089                                 .dump           = dumpit,
5090                                 .min_dump_alloc = min_dump_alloc,
5091                                 .module         = owner,
5092                         };
5093                         err = netlink_dump_start(rtnl, skb, nlh, &c);
5094                         /* netlink_dump_start() will keep a reference on
5095                          * module if dump is still in progress.
5096                          */
5097                         module_put(owner);
5098                 }
5099                 return err;
5100         }
5101
5102         link = rtnl_get_link(family, type);
5103         if (!link || !link->doit) {
5104                 family = PF_UNSPEC;
5105                 link = rtnl_get_link(PF_UNSPEC, type);
5106                 if (!link || !link->doit)
5107                         goto out_unlock;
5108         }
5109
5110         owner = link->owner;
5111         if (!try_module_get(owner)) {
5112                 err = -EPROTONOSUPPORT;
5113                 goto out_unlock;
5114         }
5115
5116         flags = link->flags;
5117         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
5118                 doit = link->doit;
5119                 rcu_read_unlock();
5120                 if (doit)
5121                         err = doit(skb, nlh, extack);
5122                 module_put(owner);
5123                 return err;
5124         }
5125         rcu_read_unlock();
5126
5127         rtnl_lock();
5128         link = rtnl_get_link(family, type);
5129         if (link && link->doit)
5130                 err = link->doit(skb, nlh, extack);
5131         rtnl_unlock();
5132
5133         module_put(owner);
5134
5135         return err;
5136
5137 out_unlock:
5138         rcu_read_unlock();
5139         return err;
5140
5141 err_unlock:
5142         rcu_read_unlock();
5143         return -EOPNOTSUPP;
5144 }
5145
5146 static void rtnetlink_rcv(struct sk_buff *skb)
5147 {
5148         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
5149 }
5150
5151 static int rtnetlink_bind(struct net *net, int group)
5152 {
5153         switch (group) {
5154         case RTNLGRP_IPV4_MROUTE_R:
5155         case RTNLGRP_IPV6_MROUTE_R:
5156                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5157                         return -EPERM;
5158                 break;
5159         }
5160         return 0;
5161 }
5162
5163 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
5164 {
5165         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5166
5167         switch (event) {
5168         case NETDEV_REBOOT:
5169         case NETDEV_CHANGEMTU:
5170         case NETDEV_CHANGEADDR:
5171         case NETDEV_CHANGENAME:
5172         case NETDEV_FEAT_CHANGE:
5173         case NETDEV_BONDING_FAILOVER:
5174         case NETDEV_POST_TYPE_CHANGE:
5175         case NETDEV_NOTIFY_PEERS:
5176         case NETDEV_CHANGEUPPER:
5177         case NETDEV_RESEND_IGMP:
5178         case NETDEV_CHANGEINFODATA:
5179         case NETDEV_CHANGELOWERSTATE:
5180         case NETDEV_CHANGE_TX_QUEUE_LEN:
5181                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
5182                                    GFP_KERNEL, NULL, 0);
5183                 break;
5184         default:
5185                 break;
5186         }
5187         return NOTIFY_DONE;
5188 }
5189
5190 static struct notifier_block rtnetlink_dev_notifier = {
5191         .notifier_call  = rtnetlink_event,
5192 };
5193
5194
5195 static int __net_init rtnetlink_net_init(struct net *net)
5196 {
5197         struct sock *sk;
5198         struct netlink_kernel_cfg cfg = {
5199                 .groups         = RTNLGRP_MAX,
5200                 .input          = rtnetlink_rcv,
5201                 .cb_mutex       = &rtnl_mutex,
5202                 .flags          = NL_CFG_F_NONROOT_RECV,
5203                 .bind           = rtnetlink_bind,
5204         };
5205
5206         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
5207         if (!sk)
5208                 return -ENOMEM;
5209         net->rtnl = sk;
5210         return 0;
5211 }
5212
5213 static void __net_exit rtnetlink_net_exit(struct net *net)
5214 {
5215         netlink_kernel_release(net->rtnl);
5216         net->rtnl = NULL;
5217 }
5218
5219 static struct pernet_operations rtnetlink_net_ops = {
5220         .init = rtnetlink_net_init,
5221         .exit = rtnetlink_net_exit,
5222 };
5223
5224 void __init rtnetlink_init(void)
5225 {
5226         if (register_pernet_subsys(&rtnetlink_net_ops))
5227                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
5228
5229         register_netdevice_notifier(&rtnetlink_dev_notifier);
5230
5231         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
5232                       rtnl_dump_ifinfo, 0);
5233         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
5234         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
5235         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
5236
5237         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
5238         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
5239         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
5240
5241         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
5242         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
5243         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
5244
5245         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
5246         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
5247         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
5248
5249         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
5250                       0);
5251 }