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/ip.h>
  50 #include <net/protocol.h>
  51 #include <net/arp.h>
  52 #include <net/route.h>
  53 #include <net/udp.h>
  54 #include <net/tcp.h>
  55 #include <net/sock.h>
  56 #include <net/pkt_sched.h>
  57 #include <net/fib_rules.h>
  58 #include <net/rtnetlink.h>
  59 #include <net/net_namespace.h>
  60
  61 #define RTNL_MAX_TYPE           50
  62 #define RTNL_SLAVE_MAX_TYPE     36
  63
  64 struct rtnl_link {
  65         rtnl_doit_func          doit;
  66         rtnl_dumpit_func        dumpit;
  67         struct module           *owner;
  68         unsigned int            flags;
  69         struct rcu_head         rcu;
  70 };
  71
  72 static DEFINE_MUTEX(rtnl_mutex);
  73
  74 void rtnl_lock(void)
  75 {
  76         mutex_lock(&rtnl_mutex);
  77 }
  78 EXPORT_SYMBOL(rtnl_lock);
  79
  80 int rtnl_lock_killable(void)
  81 {
  82         return mutex_lock_killable(&rtnl_mutex);
  83 }
  84 EXPORT_SYMBOL(rtnl_lock_killable);
  85
  86 static struct sk_buff *defer_kfree_skb_list;
  87 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
  88 {
  89         if (head && tail) {
  90                 tail->next = defer_kfree_skb_list;
  91                 defer_kfree_skb_list = head;
  92         }
  93 }
  94 EXPORT_SYMBOL(rtnl_kfree_skbs);
  95
  96 void __rtnl_unlock(void)
  97 {
  98         struct sk_buff *head = defer_kfree_skb_list;
  99
 100         defer_kfree_skb_list = NULL;
 101
 102         mutex_unlock(&rtnl_mutex);
 103
 104         while (head) {
 105                 struct sk_buff *next = head->next;
 106
 107                 kfree_skb(head);
 108                 cond_resched();
 109                 head = next;
 110         }
 111 }
 112
 113 void rtnl_unlock(void)
 114 {
 115         /* This fellow will unlock it for us. */
 116         netdev_run_todo();
 117 }
 118 EXPORT_SYMBOL(rtnl_unlock);
 119
 120 int rtnl_trylock(void)
 121 {
 122         return mutex_trylock(&rtnl_mutex);
 123 }
 124 EXPORT_SYMBOL(rtnl_trylock);
 125
 126 int rtnl_is_locked(void)
 127 {
 128         return mutex_is_locked(&rtnl_mutex);
 129 }
 130 EXPORT_SYMBOL(rtnl_is_locked);
 131
 132 bool refcount_dec_and_rtnl_lock(refcount_t *r)
 133 {
 134         return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
 135 }
 136 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
 137
 138 #ifdef CONFIG_PROVE_LOCKING
 139 bool lockdep_rtnl_is_held(void)
 140 {
 141         return lockdep_is_held(&rtnl_mutex);
 142 }
 143 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 144 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 145
 146 static struct rtnl_link *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 147
 148 static inline int rtm_msgindex(int msgtype)
 149 {
 150         int msgindex = msgtype - RTM_BASE;
 151
 152         /*
 153          * msgindex < 0 implies someone tried to register a netlink
 154          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 155          * the message type has not been added to linux/rtnetlink.h
 156          */
 157         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 158
 159         return msgindex;
 160 }
 161
 162 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
 163 {
 164         struct rtnl_link **tab;
 165
 166         if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
 167                 protocol = PF_UNSPEC;
 168
 169         tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
 170         if (!tab)
 171                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
 172
 173         return tab[msgtype];
 174 }
 175
 176 static int rtnl_register_internal(struct module *owner,
 177                                   int protocol, int msgtype,
 178                                   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 179                                   unsigned int flags)
 180 {
 181         struct rtnl_link *link, *old;
 182         struct rtnl_link __rcu **tab;
 183         int msgindex;
 184         int ret = -ENOBUFS;
 185
 186         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 187         msgindex = rtm_msgindex(msgtype);
 188
 189         rtnl_lock();
 190         tab = rtnl_msg_handlers[protocol];
 191         if (tab == NULL) {
 192                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
 193                 if (!tab)
 194                         goto unlock;
 195
 196                 /* ensures we see the 0 stores */
 197                 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
 198         }
 199
 200         old = rtnl_dereference(tab[msgindex]);
 201         if (old) {
 202                 link = kmemdup(old, sizeof(*old), GFP_KERNEL);
 203                 if (!link)
 204                         goto unlock;
 205         } else {
 206                 link = kzalloc(sizeof(*link), GFP_KERNEL);
 207                 if (!link)
 208                         goto unlock;
 209         }
 210
 211         WARN_ON(link->owner && link->owner != owner);
 212         link->owner = owner;
 213
 214         WARN_ON(doit && link->doit && link->doit != doit);
 215         if (doit)
 216                 link->doit = doit;
 217         WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
 218         if (dumpit)
 219                 link->dumpit = dumpit;
 220
 221         link->flags |= flags;
 222
 223         /* publish protocol:msgtype */
 224         rcu_assign_pointer(tab[msgindex], link);
 225         ret = 0;
 226         if (old)
 227                 kfree_rcu(old, rcu);
 228 unlock:
 229         rtnl_unlock();
 230         return ret;
 231 }
 232
 233 /**
 234  * rtnl_register_module - Register a rtnetlink message type
 235  *
 236  * @owner: module registering the hook (THIS_MODULE)
 237  * @protocol: Protocol family or PF_UNSPEC
 238  * @msgtype: rtnetlink message type
 239  * @doit: Function pointer called for each request message
 240  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 241  * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
 242  *
 243  * Like rtnl_register, but for use by removable modules.
 244  */
 245 int rtnl_register_module(struct module *owner,
 246                          int protocol, int msgtype,
 247                          rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 248                          unsigned int flags)
 249 {
 250         return rtnl_register_internal(owner, protocol, msgtype,
 251                                       doit, dumpit, flags);
 252 }
 253 EXPORT_SYMBOL_GPL(rtnl_register_module);
 254
 255 /**
 256  * rtnl_register - Register a rtnetlink message type
 257  * @protocol: Protocol family or PF_UNSPEC
 258  * @msgtype: rtnetlink message type
 259  * @doit: Function pointer called for each request message
 260  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 261  * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
 262  *
 263  * Registers the specified function pointers (at least one of them has
 264  * to be non-NULL) to be called whenever a request message for the
 265  * specified protocol family and message type is received.
 266  *
 267  * The special protocol family PF_UNSPEC may be used to define fallback
 268  * function pointers for the case when no entry for the specific protocol
 269  * family exists.
 270  */
 271 void rtnl_register(int protocol, int msgtype,
 272                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 273                    unsigned int flags)
 274 {
 275         int err;
 276
 277         err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
 278                                      flags);
 279         if (err)
 280                 pr_err("Unable to register rtnetlink message handler, "
 281                        "protocol = %d, message type = %d\n", protocol, msgtype);
 282 }
 283
 284 /**
 285  * rtnl_unregister - Unregister a rtnetlink message type
 286  * @protocol: Protocol family or PF_UNSPEC
 287  * @msgtype: rtnetlink message type
 288  *
 289  * Returns 0 on success or a negative error code.
 290  */
 291 int rtnl_unregister(int protocol, int msgtype)
 292 {
 293         struct rtnl_link **tab, *link;
 294         int msgindex;
 295
 296         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 297         msgindex = rtm_msgindex(msgtype);
 298
 299         rtnl_lock();
 300         tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
 301         if (!tab) {
 302                 rtnl_unlock();
 303                 return -ENOENT;
 304         }
 305
 306         link = tab[msgindex];
 307         rcu_assign_pointer(tab[msgindex], NULL);
 308         rtnl_unlock();
 309
 310         kfree_rcu(link, rcu);
 311
 312         return 0;
 313 }
 314 EXPORT_SYMBOL_GPL(rtnl_unregister);
 315
 316 /**
 317  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 318  * @protocol : Protocol family or PF_UNSPEC
 319  *
 320  * Identical to calling rtnl_unregster() for all registered message types
 321  * of a certain protocol family.
 322  */
 323 void rtnl_unregister_all(int protocol)
 324 {
 325         struct rtnl_link **tab, *link;
 326         int msgindex;
 327
 328         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 329
 330         rtnl_lock();
 331         tab = rtnl_msg_handlers[protocol];
 332         if (!tab) {
 333                 rtnl_unlock();
 334                 return;
 335         }
 336         RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
 337         for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
 338                 link = tab[msgindex];
 339                 if (!link)
 340                         continue;
 341
 342                 rcu_assign_pointer(tab[msgindex], NULL);
 343                 kfree_rcu(link, rcu);
 344         }
 345         rtnl_unlock();
 346
 347         synchronize_net();
 348
 349         kfree(tab);
 350 }
 351 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 352
 353 static LIST_HEAD(link_ops);
 354
 355 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 356 {
 357         const struct rtnl_link_ops *ops;
 358
 359         list_for_each_entry(ops, &link_ops, list) {
 360                 if (!strcmp(ops->kind, kind))
 361                         return ops;
 362         }
 363         return NULL;
 364 }
 365
 366 /**
 367  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 368  * @ops: struct rtnl_link_ops * to register
 369  *
 370  * The caller must hold the rtnl_mutex. This function should be used
 371  * by drivers that create devices during module initialization. It
 372  * must be called before registering the devices.
 373  *
 374  * Returns 0 on success or a negative error code.
 375  */
 376 int __rtnl_link_register(struct rtnl_link_ops *ops)
 377 {
 378         if (rtnl_link_ops_get(ops->kind))
 379                 return -EEXIST;
 380
 381         /* The check for setup is here because if ops
 382          * does not have that filled up, it is not possible
 383          * to use the ops for creating device. So do not
 384          * fill up dellink as well. That disables rtnl_dellink.
 385          */
 386         if (ops->setup && !ops->dellink)
 387                 ops->dellink = unregister_netdevice_queue;
 388
 389         list_add_tail(&ops->list, &link_ops);
 390         return 0;
 391 }
 392 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 393
 394 /**
 395  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 396  * @ops: struct rtnl_link_ops * to register
 397  *
 398  * Returns 0 on success or a negative error code.
 399  */
 400 int rtnl_link_register(struct rtnl_link_ops *ops)
 401 {
 402         int err;
 403
 404         /* Sanity-check max sizes to avoid stack buffer overflow. */
 405         if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
 406                     ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
 407                 return -EINVAL;
 408
 409         rtnl_lock();
 410         err = __rtnl_link_register(ops);
 411         rtnl_unlock();
 412         return err;
 413 }
 414 EXPORT_SYMBOL_GPL(rtnl_link_register);
 415
 416 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 417 {
 418         struct net_device *dev;
 419         LIST_HEAD(list_kill);
 420
 421         for_each_netdev(net, dev) {
 422                 if (dev->rtnl_link_ops == ops)
 423                         ops->dellink(dev, &list_kill);
 424         }
 425         unregister_netdevice_many(&list_kill);
 426 }
 427
 428 /**
 429  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 430  * @ops: struct rtnl_link_ops * to unregister
 431  *
 432  * The caller must hold the rtnl_mutex and guarantee net_namespace_list
 433  * integrity (hold pernet_ops_rwsem for writing to close the race
 434  * with setup_net() and cleanup_net()).
 435  */
 436 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 437 {
 438         struct net *net;
 439
 440         for_each_net(net) {
 441                 __rtnl_kill_links(net, ops);
 442         }
 443         list_del(&ops->list);
 444 }
 445 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 446
 447 /* Return with the rtnl_lock held when there are no network
 448  * devices unregistering in any network namespace.
 449  */
 450 static void rtnl_lock_unregistering_all(void)
 451 {
 452         struct net *net;
 453         bool unregistering;
 454         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 455
 456         add_wait_queue(&netdev_unregistering_wq, &wait);
 457         for (;;) {
 458                 unregistering = false;
 459                 rtnl_lock();
 460                 /* We held write locked pernet_ops_rwsem, and parallel
 461                  * setup_net() and cleanup_net() are not possible.
 462                  */
 463                 for_each_net(net) {
 464                         if (net->dev_unreg_count > 0) {
 465                                 unregistering = true;
 466                                 break;
 467                         }
 468                 }
 469                 if (!unregistering)
 470                         break;
 471                 __rtnl_unlock();
 472
 473                 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 474         }
 475         remove_wait_queue(&netdev_unregistering_wq, &wait);
 476 }
 477
 478 /**
 479  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 480  * @ops: struct rtnl_link_ops * to unregister
 481  */
 482 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 483 {
 484         /* Close the race with setup_net() and cleanup_net() */
 485         down_write(&pernet_ops_rwsem);
 486         rtnl_lock_unregistering_all();
 487         __rtnl_link_unregister(ops);
 488         rtnl_unlock();
 489         up_write(&pernet_ops_rwsem);
 490 }
 491 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 492
 493 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 494 {
 495         struct net_device *master_dev;
 496         const struct rtnl_link_ops *ops;
 497         size_t size = 0;
 498
 499         rcu_read_lock();
 500
 501         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 502         if (!master_dev)
 503                 goto out;
 504
 505         ops = master_dev->rtnl_link_ops;
 506         if (!ops || !ops->get_slave_size)
 507                 goto out;
 508         /* IFLA_INFO_SLAVE_DATA + nested data */
 509         size = nla_total_size(sizeof(struct nlattr)) +
 510                ops->get_slave_size(master_dev, dev);
 511
 512 out:
 513         rcu_read_unlock();
 514         return size;
 515 }
 516
 517 static size_t rtnl_link_get_size(const struct net_device *dev)
 518 {
 519         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 520         size_t size;
 521
 522         if (!ops)
 523                 return 0;
 524
 525         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 526                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 527
 528         if (ops->get_size)
 529                 /* IFLA_INFO_DATA + nested data */
 530                 size += nla_total_size(sizeof(struct nlattr)) +
 531                         ops->get_size(dev);
 532
 533         if (ops->get_xstats_size)
 534                 /* IFLA_INFO_XSTATS */
 535                 size += nla_total_size(ops->get_xstats_size(dev));
 536
 537         size += rtnl_link_get_slave_info_data_size(dev);
 538
 539         return size;
 540 }
 541
 542 static LIST_HEAD(rtnl_af_ops);
 543
 544 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 545 {
 546         const struct rtnl_af_ops *ops;
 547
 548         list_for_each_entry_rcu(ops, &rtnl_af_ops, list) {
 549                 if (ops->family == family)
 550                         return ops;
 551         }
 552
 553         return NULL;
 554 }
 555
 556 /**
 557  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 558  * @ops: struct rtnl_af_ops * to register
 559  *
 560  * Returns 0 on success or a negative error code.
 561  */
 562 void rtnl_af_register(struct rtnl_af_ops *ops)
 563 {
 564         rtnl_lock();
 565         list_add_tail_rcu(&ops->list, &rtnl_af_ops);
 566         rtnl_unlock();
 567 }
 568 EXPORT_SYMBOL_GPL(rtnl_af_register);
 569
 570 /**
 571  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 572  * @ops: struct rtnl_af_ops * to unregister
 573  */
 574 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 575 {
 576         rtnl_lock();
 577         list_del_rcu(&ops->list);
 578         rtnl_unlock();
 579
 580         synchronize_rcu();
 581 }
 582 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 583
 584 static size_t rtnl_link_get_af_size(const struct net_device *dev,
 585                                     u32 ext_filter_mask)
 586 {
 587         struct rtnl_af_ops *af_ops;
 588         size_t size;
 589
 590         /* IFLA_AF_SPEC */
 591         size = nla_total_size(sizeof(struct nlattr));
 592
 593         rcu_read_lock();
 594         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
 595                 if (af_ops->get_link_af_size) {
 596                         /* AF_* + nested data */
 597                         size += nla_total_size(sizeof(struct nlattr)) +
 598                                 af_ops->get_link_af_size(dev, ext_filter_mask);
 599                 }
 600         }
 601         rcu_read_unlock();
 602
 603         return size;
 604 }
 605
 606 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 607 {
 608         struct net_device *master_dev;
 609         bool ret = false;
 610
 611         rcu_read_lock();
 612
 613         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 614         if (master_dev && master_dev->rtnl_link_ops)
 615                 ret = true;
 616         rcu_read_unlock();
 617         return ret;
 618 }
 619
 620 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 621                                      const struct net_device *dev)
 622 {
 623         struct net_device *master_dev;
 624         const struct rtnl_link_ops *ops;
 625         struct nlattr *slave_data;
 626         int err;
 627
 628         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 629         if (!master_dev)
 630                 return 0;
 631         ops = master_dev->rtnl_link_ops;
 632         if (!ops)
 633                 return 0;
 634         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 635                 return -EMSGSIZE;
 636         if (ops->fill_slave_info) {
 637                 slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA);
 638                 if (!slave_data)
 639                         return -EMSGSIZE;
 640                 err = ops->fill_slave_info(skb, master_dev, dev);
 641                 if (err < 0)
 642                         goto err_cancel_slave_data;
 643                 nla_nest_end(skb, slave_data);
 644         }
 645         return 0;
 646
 647 err_cancel_slave_data:
 648         nla_nest_cancel(skb, slave_data);
 649         return err;
 650 }
 651
 652 static int rtnl_link_info_fill(struct sk_buff *skb,
 653                                const struct net_device *dev)
 654 {
 655         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 656         struct nlattr *data;
 657         int err;
 658
 659         if (!ops)
 660                 return 0;
 661         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 662                 return -EMSGSIZE;
 663         if (ops->fill_xstats) {
 664                 err = ops->fill_xstats(skb, dev);
 665                 if (err < 0)
 666                         return err;
 667         }
 668         if (ops->fill_info) {
 669                 data = nla_nest_start_noflag(skb, IFLA_INFO_DATA);
 670                 if (data == NULL)
 671                         return -EMSGSIZE;
 672                 err = ops->fill_info(skb, dev);
 673                 if (err < 0)
 674                         goto err_cancel_data;
 675                 nla_nest_end(skb, data);
 676         }
 677         return 0;
 678
 679 err_cancel_data:
 680         nla_nest_cancel(skb, data);
 681         return err;
 682 }
 683
 684 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 685 {
 686         struct nlattr *linkinfo;
 687         int err = -EMSGSIZE;
 688
 689         linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO);
 690         if (linkinfo == NULL)
 691                 goto out;
 692
 693         err = rtnl_link_info_fill(skb, dev);
 694         if (err < 0)
 695                 goto err_cancel_link;
 696
 697         err = rtnl_link_slave_info_fill(skb, dev);
 698         if (err < 0)
 699                 goto err_cancel_link;
 700
 701         nla_nest_end(skb, linkinfo);
 702         return 0;
 703
 704 err_cancel_link:
 705         nla_nest_cancel(skb, linkinfo);
 706 out:
 707         return err;
 708 }
 709
 710 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 711 {
 712         struct sock *rtnl = net->rtnl;
 713         int err = 0;
 714
 715         NETLINK_CB(skb).dst_group = group;
 716         if (echo)
 717                 refcount_inc(&skb->users);
 718         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 719         if (echo)
 720                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 721         return err;
 722 }
 723
 724 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 725 {
 726         struct sock *rtnl = net->rtnl;
 727
 728         return nlmsg_unicast(rtnl, skb, pid);
 729 }
 730 EXPORT_SYMBOL(rtnl_unicast);
 731
 732 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 733                  struct nlmsghdr *nlh, gfp_t flags)
 734 {
 735         struct sock *rtnl = net->rtnl;
 736         int report = 0;
 737
 738         if (nlh)
 739                 report = nlmsg_report(nlh);
 740
 741         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 742 }
 743 EXPORT_SYMBOL(rtnl_notify);
 744
 745 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 746 {
 747         struct sock *rtnl = net->rtnl;
 748
 749         netlink_set_err(rtnl, 0, group, error);
 750 }
 751 EXPORT_SYMBOL(rtnl_set_sk_err);
 752
 753 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 754 {
 755         struct nlattr *mx;
 756         int i, valid = 0;
 757
 758         mx = nla_nest_start_noflag(skb, RTA_METRICS);
 759         if (mx == NULL)
 760                 return -ENOBUFS;
 761
 762         for (i = 0; i < RTAX_MAX; i++) {
 763                 if (metrics[i]) {
 764                         if (i == RTAX_CC_ALGO - 1) {
 765                                 char tmp[TCP_CA_NAME_MAX], *name;
 766
 767                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 768                                 if (!name)
 769                                         continue;
 770                                 if (nla_put_string(skb, i + 1, name))
 771                                         goto nla_put_failure;
 772                         } else if (i == RTAX_FEATURES - 1) {
 773                                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 774
 775                                 if (!user_features)
 776                                         continue;
 777                                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 778                                 if (nla_put_u32(skb, i + 1, user_features))
 779                                         goto nla_put_failure;
 780                         } else {
 781                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 782                                         goto nla_put_failure;
 783                         }
 784                         valid++;
 785                 }
 786         }
 787
 788         if (!valid) {
 789                 nla_nest_cancel(skb, mx);
 790                 return 0;
 791         }
 792
 793         return nla_nest_end(skb, mx);
 794
 795 nla_put_failure:
 796         nla_nest_cancel(skb, mx);
 797         return -EMSGSIZE;
 798 }
 799 EXPORT_SYMBOL(rtnetlink_put_metrics);
 800
 801 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 802                        long expires, u32 error)
 803 {
 804         struct rta_cacheinfo ci = {
 805                 .rta_error = error,
 806                 .rta_id =  id,
 807         };
 808
 809         if (dst) {
 810                 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
 811                 ci.rta_used = dst->__use;
 812                 ci.rta_clntref = atomic_read(&dst->__refcnt);
 813         }
 814         if (expires) {
 815                 unsigned long clock;
 816
 817                 clock = jiffies_to_clock_t(abs(expires));
 818                 clock = min_t(unsigned long, clock, INT_MAX);
 819                 ci.rta_expires = (expires > 0) ? clock : -clock;
 820         }
 821         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 822 }
 823 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 824
 825 static void set_operstate(struct net_device *dev, unsigned char transition)
 826 {
 827         unsigned char operstate = dev->operstate;
 828
 829         switch (transition) {
 830         case IF_OPER_UP:
 831                 if ((operstate == IF_OPER_DORMANT ||
 832                      operstate == IF_OPER_UNKNOWN) &&
 833                     !netif_dormant(dev))
 834                         operstate = IF_OPER_UP;
 835                 break;
 836
 837         case IF_OPER_DORMANT:
 838                 if (operstate == IF_OPER_UP ||
 839                     operstate == IF_OPER_UNKNOWN)
 840                         operstate = IF_OPER_DORMANT;
 841                 break;
 842         }
 843
 844         if (dev->operstate != operstate) {
 845                 write_lock_bh(&dev_base_lock);
 846                 dev->operstate = operstate;
 847                 write_unlock_bh(&dev_base_lock);
 848                 netdev_state_change(dev);
 849         }
 850 }
 851
 852 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 853 {
 854         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 855                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 856 }
 857
 858 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 859                                            const struct ifinfomsg *ifm)
 860 {
 861         unsigned int flags = ifm->ifi_flags;
 862
 863         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 864         if (ifm->ifi_change)
 865                 flags = (flags & ifm->ifi_change) |
 866                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 867
 868         return flags;
 869 }
 870
 871 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 872                                  const struct rtnl_link_stats64 *b)
 873 {
 874         a->rx_packets = b->rx_packets;
 875         a->tx_packets = b->tx_packets;
 876         a->rx_bytes = b->rx_bytes;
 877         a->tx_bytes = b->tx_bytes;
 878         a->rx_errors = b->rx_errors;
 879         a->tx_errors = b->tx_errors;
 880         a->rx_dropped = b->rx_dropped;
 881         a->tx_dropped = b->tx_dropped;
 882
 883         a->multicast = b->multicast;
 884         a->collisions = b->collisions;
 885
 886         a->rx_length_errors = b->rx_length_errors;
 887         a->rx_over_errors = b->rx_over_errors;
 888         a->rx_crc_errors = b->rx_crc_errors;
 889         a->rx_frame_errors = b->rx_frame_errors;
 890         a->rx_fifo_errors = b->rx_fifo_errors;
 891         a->rx_missed_errors = b->rx_missed_errors;
 892
 893         a->tx_aborted_errors = b->tx_aborted_errors;
 894         a->tx_carrier_errors = b->tx_carrier_errors;
 895         a->tx_fifo_errors = b->tx_fifo_errors;
 896         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 897         a->tx_window_errors = b->tx_window_errors;
 898
 899         a->rx_compressed = b->rx_compressed;
 900         a->tx_compressed = b->tx_compressed;
 901
 902         a->rx_nohandler = b->rx_nohandler;
 903 }
 904
 905 /* All VF info */
 906 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 907                                    u32 ext_filter_mask)
 908 {
 909         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
 910                 int num_vfs = dev_num_vf(dev->dev.parent);
 911                 size_t size = nla_total_size(0);
 912                 size += num_vfs *
 913                         (nla_total_size(0) +
 914                          nla_total_size(sizeof(struct ifla_vf_mac)) +
 915                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 916                          nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
 917                          nla_total_size(MAX_VLAN_LIST_LEN *
 918                                         sizeof(struct ifla_vf_vlan_info)) +
 919                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 920                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 921                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 922                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 923                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 924                          nla_total_size(0) + /* nest IFLA_VF_STATS */
 925                          /* IFLA_VF_STATS_RX_PACKETS */
 926                          nla_total_size_64bit(sizeof(__u64)) +
 927                          /* IFLA_VF_STATS_TX_PACKETS */
 928                          nla_total_size_64bit(sizeof(__u64)) +
 929                          /* IFLA_VF_STATS_RX_BYTES */
 930                          nla_total_size_64bit(sizeof(__u64)) +
 931                          /* IFLA_VF_STATS_TX_BYTES */
 932                          nla_total_size_64bit(sizeof(__u64)) +
 933                          /* IFLA_VF_STATS_BROADCAST */
 934                          nla_total_size_64bit(sizeof(__u64)) +
 935                          /* IFLA_VF_STATS_MULTICAST */
 936                          nla_total_size_64bit(sizeof(__u64)) +
 937                          /* IFLA_VF_STATS_RX_DROPPED */
 938                          nla_total_size_64bit(sizeof(__u64)) +
 939                          /* IFLA_VF_STATS_TX_DROPPED */
 940                          nla_total_size_64bit(sizeof(__u64)) +
 941                          nla_total_size(sizeof(struct ifla_vf_trust)));
 942                 return size;
 943         } else
 944                 return 0;
 945 }
 946
 947 static size_t rtnl_port_size(const struct net_device *dev,
 948                              u32 ext_filter_mask)
 949 {
 950         size_t port_size = nla_total_size(4)            /* PORT_VF */
 951                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 952                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 953                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 954                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 955                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 956         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 957         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 958                 + port_size;
 959         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 960                 + port_size;
 961
 962         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 963             !(ext_filter_mask & RTEXT_FILTER_VF))
 964                 return 0;
 965         if (dev_num_vf(dev->dev.parent))
 966                 return port_self_size + vf_ports_size +
 967                         vf_port_size * dev_num_vf(dev->dev.parent);
 968         else
 969                 return port_self_size;
 970 }
 971
 972 static size_t rtnl_xdp_size(void)
 973 {
 974         size_t xdp_size = nla_total_size(0) +   /* nest IFLA_XDP */
 975                           nla_total_size(1) +   /* XDP_ATTACHED */
 976                           nla_total_size(4) +   /* XDP_PROG_ID (or 1st mode) */
 977                           nla_total_size(4);    /* XDP_<mode>_PROG_ID */
 978
 979         return xdp_size;
 980 }
 981
 982 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 983                                      u32 ext_filter_mask)
 984 {
 985         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 986                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 987                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 988                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 989                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
 990                + nla_total_size(sizeof(struct rtnl_link_stats))
 991                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
 992                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 993                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 994                + nla_total_size(4) /* IFLA_TXQLEN */
 995                + nla_total_size(4) /* IFLA_WEIGHT */
 996                + nla_total_size(4) /* IFLA_MTU */
 997                + nla_total_size(4) /* IFLA_LINK */
 998                + nla_total_size(4) /* IFLA_MASTER */
 999                + nla_total_size(1) /* IFLA_CARRIER */
1000                + nla_total_size(4) /* IFLA_PROMISCUITY */
1001                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1002                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1003                + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1004                + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1005                + nla_total_size(1) /* IFLA_OPERSTATE */
1006                + nla_total_size(1) /* IFLA_LINKMODE */
1007                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1008                + nla_total_size(4) /* IFLA_LINK_NETNSID */
1009                + nla_total_size(4) /* IFLA_GROUP */
1010                + nla_total_size(ext_filter_mask
1011                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1012                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1013                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1014                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1015                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1016                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1017                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1018                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1019                + rtnl_xdp_size() /* IFLA_XDP */
1020                + nla_total_size(4)  /* IFLA_EVENT */
1021                + nla_total_size(4)  /* IFLA_NEW_NETNSID */
1022                + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
1023                + nla_total_size(1)  /* IFLA_PROTO_DOWN */
1024                + nla_total_size(4)  /* IFLA_TARGET_NETNSID */
1025                + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
1026                + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
1027                + nla_total_size(4)  /* IFLA_MIN_MTU */
1028                + nla_total_size(4)  /* IFLA_MAX_MTU */
1029                + 0;
1030 }
1031
1032 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1033 {
1034         struct nlattr *vf_ports;
1035         struct nlattr *vf_port;
1036         int vf;
1037         int err;
1038
1039         vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
1040         if (!vf_ports)
1041                 return -EMSGSIZE;
1042
1043         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1044                 vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
1045                 if (!vf_port)
1046                         goto nla_put_failure;
1047                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1048                         goto nla_put_failure;
1049                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1050                 if (err == -EMSGSIZE)
1051                         goto nla_put_failure;
1052                 if (err) {
1053                         nla_nest_cancel(skb, vf_port);
1054                         continue;
1055                 }
1056                 nla_nest_end(skb, vf_port);
1057         }
1058
1059         nla_nest_end(skb, vf_ports);
1060
1061         return 0;
1062
1063 nla_put_failure:
1064         nla_nest_cancel(skb, vf_ports);
1065         return -EMSGSIZE;
1066 }
1067
1068 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1069 {
1070         struct nlattr *port_self;
1071         int err;
1072
1073         port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
1074         if (!port_self)
1075                 return -EMSGSIZE;
1076
1077         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1078         if (err) {
1079                 nla_nest_cancel(skb, port_self);
1080                 return (err == -EMSGSIZE) ? err : 0;
1081         }
1082
1083         nla_nest_end(skb, port_self);
1084
1085         return 0;
1086 }
1087
1088 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1089                           u32 ext_filter_mask)
1090 {
1091         int err;
1092
1093         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1094             !(ext_filter_mask & RTEXT_FILTER_VF))
1095                 return 0;
1096
1097         err = rtnl_port_self_fill(skb, dev);
1098         if (err)
1099                 return err;
1100
1101         if (dev_num_vf(dev->dev.parent)) {
1102                 err = rtnl_vf_ports_fill(skb, dev);
1103                 if (err)
1104                         return err;
1105         }
1106
1107         return 0;
1108 }
1109
1110 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1111 {
1112         int err;
1113         struct netdev_phys_item_id ppid;
1114
1115         err = dev_get_phys_port_id(dev, &ppid);
1116         if (err) {
1117                 if (err == -EOPNOTSUPP)
1118                         return 0;
1119                 return err;
1120         }
1121
1122         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1123                 return -EMSGSIZE;
1124
1125         return 0;
1126 }
1127
1128 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1129 {
1130         char name[IFNAMSIZ];
1131         int err;
1132
1133         err = dev_get_phys_port_name(dev, name, sizeof(name));
1134         if (err) {
1135                 if (err == -EOPNOTSUPP)
1136                         return 0;
1137                 return err;
1138         }
1139
1140         if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1141                 return -EMSGSIZE;
1142
1143         return 0;
1144 }
1145
1146 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1147 {
1148         struct netdev_phys_item_id ppid = { };
1149         int err;
1150
1151         err = dev_get_port_parent_id(dev, &ppid, false);
1152         if (err) {
1153                 if (err == -EOPNOTSUPP)
1154                         return 0;
1155                 return err;
1156         }
1157
1158         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
1159                 return -EMSGSIZE;
1160
1161         return 0;
1162 }
1163
1164 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1165                                               struct net_device *dev)
1166 {
1167         struct rtnl_link_stats64 *sp;
1168         struct nlattr *attr;
1169
1170         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1171                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1172         if (!attr)
1173                 return -EMSGSIZE;
1174
1175         sp = nla_data(attr);
1176         dev_get_stats(dev, sp);
1177
1178         attr = nla_reserve(skb, IFLA_STATS,
1179                            sizeof(struct rtnl_link_stats));
1180         if (!attr)
1181                 return -EMSGSIZE;
1182
1183         copy_rtnl_link_stats(nla_data(attr), sp);
1184
1185         return 0;
1186 }
1187
1188 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1189                                                struct net_device *dev,
1190                                                int vfs_num,
1191                                                struct nlattr *vfinfo)
1192 {
1193         struct ifla_vf_rss_query_en vf_rss_query_en;
1194         struct nlattr *vf, *vfstats, *vfvlanlist;
1195         struct ifla_vf_link_state vf_linkstate;
1196         struct ifla_vf_vlan_info vf_vlan_info;
1197         struct ifla_vf_spoofchk vf_spoofchk;
1198         struct ifla_vf_tx_rate vf_tx_rate;
1199         struct ifla_vf_stats vf_stats;
1200         struct ifla_vf_trust vf_trust;
1201         struct ifla_vf_vlan vf_vlan;
1202         struct ifla_vf_rate vf_rate;
1203         struct ifla_vf_mac vf_mac;
1204         struct ifla_vf_info ivi;
1205
1206         memset(&ivi, 0, sizeof(ivi));
1207
1208         /* Not all SR-IOV capable drivers support the
1209          * spoofcheck and "RSS query enable" query.  Preset to
1210          * -1 so the user space tool can detect that the driver
1211          * didn't report anything.
1212          */
1213         ivi.spoofchk = -1;
1214         ivi.rss_query_en = -1;
1215         ivi.trusted = -1;
1216         /* The default value for VF link state is "auto"
1217          * IFLA_VF_LINK_STATE_AUTO which equals zero
1218          */
1219         ivi.linkstate = 0;
1220         /* VLAN Protocol by default is 802.1Q */
1221         ivi.vlan_proto = htons(ETH_P_8021Q);
1222         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1223                 return 0;
1224
1225         memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1226
1227         vf_mac.vf =
1228                 vf_vlan.vf =
1229                 vf_vlan_info.vf =
1230                 vf_rate.vf =
1231                 vf_tx_rate.vf =
1232                 vf_spoofchk.vf =
1233                 vf_linkstate.vf =
1234                 vf_rss_query_en.vf =
1235                 vf_trust.vf = ivi.vf;
1236
1237         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1238         vf_vlan.vlan = ivi.vlan;
1239         vf_vlan.qos = ivi.qos;
1240         vf_vlan_info.vlan = ivi.vlan;
1241         vf_vlan_info.qos = ivi.qos;
1242         vf_vlan_info.vlan_proto = ivi.vlan_proto;
1243         vf_tx_rate.rate = ivi.max_tx_rate;
1244         vf_rate.min_tx_rate = ivi.min_tx_rate;
1245         vf_rate.max_tx_rate = ivi.max_tx_rate;
1246         vf_spoofchk.setting = ivi.spoofchk;
1247         vf_linkstate.link_state = ivi.linkstate;
1248         vf_rss_query_en.setting = ivi.rss_query_en;
1249         vf_trust.setting = ivi.trusted;
1250         vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1251         if (!vf)
1252                 goto nla_put_vfinfo_failure;
1253         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1254             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1255             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1256                     &vf_rate) ||
1257             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1258                     &vf_tx_rate) ||
1259             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1260                     &vf_spoofchk) ||
1261             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1262                     &vf_linkstate) ||
1263             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1264                     sizeof(vf_rss_query_en),
1265                     &vf_rss_query_en) ||
1266             nla_put(skb, IFLA_VF_TRUST,
1267                     sizeof(vf_trust), &vf_trust))
1268                 goto nla_put_vf_failure;
1269         vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1270         if (!vfvlanlist)
1271                 goto nla_put_vf_failure;
1272         if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1273                     &vf_vlan_info)) {
1274                 nla_nest_cancel(skb, vfvlanlist);
1275                 goto nla_put_vf_failure;
1276         }
1277         nla_nest_end(skb, vfvlanlist);
1278         memset(&vf_stats, 0, sizeof(vf_stats));
1279         if (dev->netdev_ops->ndo_get_vf_stats)
1280                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1281                                                 &vf_stats);
1282         vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1283         if (!vfstats)
1284                 goto nla_put_vf_failure;
1285         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1286                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1287             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1288                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1289             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1290                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1291             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1292                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1293             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1294                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1295             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1296                               vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1297             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1298                               vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1299             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1300                               vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1301                 nla_nest_cancel(skb, vfstats);
1302                 goto nla_put_vf_failure;
1303         }
1304         nla_nest_end(skb, vfstats);
1305         nla_nest_end(skb, vf);
1306         return 0;
1307
1308 nla_put_vf_failure:
1309         nla_nest_cancel(skb, vf);
1310 nla_put_vfinfo_failure:
1311         nla_nest_cancel(skb, vfinfo);
1312         return -EMSGSIZE;
1313 }
1314
1315 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1316                                            struct net_device *dev,
1317                                            u32 ext_filter_mask)
1318 {
1319         struct nlattr *vfinfo;
1320         int i, num_vfs;
1321
1322         if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1323                 return 0;
1324
1325         num_vfs = dev_num_vf(dev->dev.parent);
1326         if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1327                 return -EMSGSIZE;
1328
1329         if (!dev->netdev_ops->ndo_get_vf_config)
1330                 return 0;
1331
1332         vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1333         if (!vfinfo)
1334                 return -EMSGSIZE;
1335
1336         for (i = 0; i < num_vfs; i++) {
1337                 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1338                         return -EMSGSIZE;
1339         }
1340
1341         nla_nest_end(skb, vfinfo);
1342         return 0;
1343 }
1344
1345 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1346 {
1347         struct rtnl_link_ifmap map;
1348
1349         memset(&map, 0, sizeof(map));
1350         map.mem_start   = dev->mem_start;
1351         map.mem_end     = dev->mem_end;
1352         map.base_addr   = dev->base_addr;
1353         map.irq         = dev->irq;
1354         map.dma         = dev->dma;
1355         map.port        = dev->if_port;
1356
1357         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1358                 return -EMSGSIZE;
1359
1360         return 0;
1361 }
1362
1363 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1364 {
1365         const struct bpf_prog *generic_xdp_prog;
1366
1367         ASSERT_RTNL();
1368
1369         generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1370         if (!generic_xdp_prog)
1371                 return 0;
1372         return generic_xdp_prog->aux->id;
1373 }
1374
1375 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1376 {
1377         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf, XDP_QUERY_PROG);
1378 }
1379
1380 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1381 {
1382         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf,
1383                                XDP_QUERY_PROG_HW);
1384 }
1385
1386 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1387                                u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1388                                u32 (*get_prog_id)(struct net_device *dev))
1389 {
1390         u32 curr_id;
1391         int err;
1392
1393         curr_id = get_prog_id(dev);
1394         if (!curr_id)
1395                 return 0;
1396
1397         *prog_id = curr_id;
1398         err = nla_put_u32(skb, attr, curr_id);
1399         if (err)
1400                 return err;
1401
1402         if (*mode != XDP_ATTACHED_NONE)
1403                 *mode = XDP_ATTACHED_MULTI;
1404         else
1405                 *mode = tgt_mode;
1406
1407         return 0;
1408 }
1409
1410 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1411 {
1412         struct nlattr *xdp;
1413         u32 prog_id;
1414         int err;
1415         u8 mode;
1416
1417         xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1418         if (!xdp)
1419                 return -EMSGSIZE;
1420
1421         prog_id = 0;
1422         mode = XDP_ATTACHED_NONE;
1423         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1424                                   IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1425         if (err)
1426                 goto err_cancel;
1427         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1428                                   IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1429         if (err)
1430                 goto err_cancel;
1431         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1432                                   IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1433         if (err)
1434                 goto err_cancel;
1435
1436         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1437         if (err)
1438                 goto err_cancel;
1439
1440         if (prog_id && mode != XDP_ATTACHED_MULTI) {
1441                 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1442                 if (err)
1443                         goto err_cancel;
1444         }
1445
1446         nla_nest_end(skb, xdp);
1447         return 0;
1448
1449 err_cancel:
1450         nla_nest_cancel(skb, xdp);
1451         return err;
1452 }
1453
1454 static u32 rtnl_get_event(unsigned long event)
1455 {
1456         u32 rtnl_event_type = IFLA_EVENT_NONE;
1457
1458         switch (event) {
1459         case NETDEV_REBOOT:
1460                 rtnl_event_type = IFLA_EVENT_REBOOT;
1461                 break;
1462         case NETDEV_FEAT_CHANGE:
1463                 rtnl_event_type = IFLA_EVENT_FEATURES;
1464                 break;
1465         case NETDEV_BONDING_FAILOVER:
1466                 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1467                 break;
1468         case NETDEV_NOTIFY_PEERS:
1469                 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1470                 break;
1471         case NETDEV_RESEND_IGMP:
1472                 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1473                 break;
1474         case NETDEV_CHANGEINFODATA:
1475                 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1476                 break;
1477         default:
1478                 break;
1479         }
1480
1481         return rtnl_event_type;
1482 }
1483
1484 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1485 {
1486         const struct net_device *upper_dev;
1487         int ret = 0;
1488
1489         rcu_read_lock();
1490
1491         upper_dev = netdev_master_upper_dev_get_rcu(dev);
1492         if (upper_dev)
1493                 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1494
1495         rcu_read_unlock();
1496         return ret;
1497 }
1498
1499 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1500                           bool force)
1501 {
1502         int ifindex = dev_get_iflink(dev);
1503
1504         if (force || dev->ifindex != ifindex)
1505                 return nla_put_u32(skb, IFLA_LINK, ifindex);
1506
1507         return 0;
1508 }
1509
1510 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1511                                               struct net_device *dev)
1512 {
1513         char buf[IFALIASZ];
1514         int ret;
1515
1516         ret = dev_get_alias(dev, buf, sizeof(buf));
1517         return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1518 }
1519
1520 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1521                                   const struct net_device *dev,
1522                                   struct net *src_net)
1523 {
1524         bool put_iflink = false;
1525
1526         if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1527                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1528
1529                 if (!net_eq(dev_net(dev), link_net)) {
1530                         int id = peernet2id_alloc(src_net, link_net);
1531
1532                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1533                                 return -EMSGSIZE;
1534
1535                         put_iflink = true;
1536                 }
1537         }
1538
1539         return nla_put_iflink(skb, dev, put_iflink);
1540 }
1541
1542 static int rtnl_fill_link_af(struct sk_buff *skb,
1543                              const struct net_device *dev,
1544                              u32 ext_filter_mask)
1545 {
1546         const struct rtnl_af_ops *af_ops;
1547         struct nlattr *af_spec;
1548
1549         af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1550         if (!af_spec)
1551                 return -EMSGSIZE;
1552
1553         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1554                 struct nlattr *af;
1555                 int err;
1556
1557                 if (!af_ops->fill_link_af)
1558                         continue;
1559
1560                 af = nla_nest_start_noflag(skb, af_ops->family);
1561                 if (!af)
1562                         return -EMSGSIZE;
1563
1564                 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1565                 /*
1566                  * Caller may return ENODATA to indicate that there
1567                  * was no data to be dumped. This is not an error, it
1568                  * means we should trim the attribute header and
1569                  * continue.
1570                  */
1571                 if (err == -ENODATA)
1572                         nla_nest_cancel(skb, af);
1573                 else if (err < 0)
1574                         return -EMSGSIZE;
1575
1576                 nla_nest_end(skb, af);
1577         }
1578
1579         nla_nest_end(skb, af_spec);
1580         return 0;
1581 }
1582
1583 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1584                             struct net_device *dev, struct net *src_net,
1585                             int type, u32 pid, u32 seq, u32 change,
1586                             unsigned int flags, u32 ext_filter_mask,
1587                             u32 event, int *new_nsid, int new_ifindex,
1588                             int tgt_netnsid)
1589 {
1590         struct ifinfomsg *ifm;
1591         struct nlmsghdr *nlh;
1592
1593         ASSERT_RTNL();
1594         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1595         if (nlh == NULL)
1596                 return -EMSGSIZE;
1597
1598         ifm = nlmsg_data(nlh);
1599         ifm->ifi_family = AF_UNSPEC;
1600         ifm->__ifi_pad = 0;
1601         ifm->ifi_type = dev->type;
1602         ifm->ifi_index = dev->ifindex;
1603         ifm->ifi_flags = dev_get_flags(dev);
1604         ifm->ifi_change = change;
1605
1606         if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1607                 goto nla_put_failure;
1608
1609         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1610             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1611             nla_put_u8(skb, IFLA_OPERSTATE,
1612                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1613             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1614             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1615             nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1616             nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1617             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1618             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1619             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1620             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1621             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1622 #ifdef CONFIG_RPS
1623             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1624 #endif
1625             put_master_ifindex(skb, dev) ||
1626             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1627             (dev->qdisc &&
1628              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1629             nla_put_ifalias(skb, dev) ||
1630             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1631                         atomic_read(&dev->carrier_up_count) +
1632                         atomic_read(&dev->carrier_down_count)) ||
1633             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down) ||
1634             nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1635                         atomic_read(&dev->carrier_up_count)) ||
1636             nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1637                         atomic_read(&dev->carrier_down_count)))
1638                 goto nla_put_failure;
1639
1640         if (event != IFLA_EVENT_NONE) {
1641                 if (nla_put_u32(skb, IFLA_EVENT, event))
1642                         goto nla_put_failure;
1643         }
1644
1645         if (rtnl_fill_link_ifmap(skb, dev))
1646                 goto nla_put_failure;
1647
1648         if (dev->addr_len) {
1649                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1650                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1651                         goto nla_put_failure;
1652         }
1653
1654         if (rtnl_phys_port_id_fill(skb, dev))
1655                 goto nla_put_failure;
1656
1657         if (rtnl_phys_port_name_fill(skb, dev))
1658                 goto nla_put_failure;
1659
1660         if (rtnl_phys_switch_id_fill(skb, dev))
1661                 goto nla_put_failure;
1662
1663         if (rtnl_fill_stats(skb, dev))
1664                 goto nla_put_failure;
1665
1666         if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1667                 goto nla_put_failure;
1668
1669         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1670                 goto nla_put_failure;
1671
1672         if (rtnl_xdp_fill(skb, dev))
1673                 goto nla_put_failure;
1674
1675         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1676                 if (rtnl_link_fill(skb, dev) < 0)
1677                         goto nla_put_failure;
1678         }
1679
1680         if (rtnl_fill_link_netnsid(skb, dev, src_net))
1681                 goto nla_put_failure;
1682
1683         if (new_nsid &&
1684             nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1685                 goto nla_put_failure;
1686         if (new_ifindex &&
1687             nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1688                 goto nla_put_failure;
1689
1690
1691         rcu_read_lock();
1692         if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1693                 goto nla_put_failure_rcu;
1694         rcu_read_unlock();
1695
1696         nlmsg_end(skb, nlh);
1697         return 0;
1698
1699 nla_put_failure_rcu:
1700         rcu_read_unlock();
1701 nla_put_failure:
1702         nlmsg_cancel(skb, nlh);
1703         return -EMSGSIZE;
1704 }
1705
1706 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1707         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1708         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1709         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1710         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1711         [IFLA_MTU]              = { .type = NLA_U32 },
1712         [IFLA_LINK]             = { .type = NLA_U32 },
1713         [IFLA_MASTER]           = { .type = NLA_U32 },
1714         [IFLA_CARRIER]          = { .type = NLA_U8 },
1715         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1716         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1717         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1718         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1719         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1720         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1721         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1722         /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1723          * allow 0-length string (needed to remove an alias).
1724          */
1725         [IFLA_IFALIAS]          = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1726         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1727         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1728         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1729         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1730         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1731         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1732         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1733         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1734         [IFLA_GSO_MAX_SEGS]     = { .type = NLA_U32 },
1735         [IFLA_GSO_MAX_SIZE]     = { .type = NLA_U32 },
1736         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1737         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1738         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1739         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1740         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1741         [IFLA_XDP]              = { .type = NLA_NESTED },
1742         [IFLA_EVENT]            = { .type = NLA_U32 },
1743         [IFLA_GROUP]            = { .type = NLA_U32 },
1744         [IFLA_TARGET_NETNSID]   = { .type = NLA_S32 },
1745         [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1746         [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1747         [IFLA_MIN_MTU]          = { .type = NLA_U32 },
1748         [IFLA_MAX_MTU]          = { .type = NLA_U32 },
1749 };
1750
1751 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1752         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1753         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1754         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1755         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1756 };
1757
1758 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1759         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1760         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1761         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1762         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1763         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1764         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1765         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1766         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1767         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1768         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1769         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1770         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1771 };
1772
1773 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1774         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1775         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1776                                     .len = PORT_PROFILE_MAX },
1777         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1778                                       .len = PORT_UUID_MAX },
1779         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1780                                     .len = PORT_UUID_MAX },
1781         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1782         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1783
1784         /* Unused, but we need to keep it here since user space could
1785          * fill it. It's also broken with regard to NLA_BINARY use in
1786          * combination with structs.
1787          */
1788         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1789                                     .len = sizeof(struct ifla_port_vsi) },
1790 };
1791
1792 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1793         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1794         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1795         [IFLA_XDP_FLAGS]        = { .type = NLA_U32 },
1796         [IFLA_XDP_PROG_ID]      = { .type = NLA_U32 },
1797 };
1798
1799 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1800 {
1801         const struct rtnl_link_ops *ops = NULL;
1802         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1803
1804         if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
1805                 return NULL;
1806
1807         if (linfo[IFLA_INFO_KIND]) {
1808                 char kind[MODULE_NAME_LEN];
1809
1810                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1811                 ops = rtnl_link_ops_get(kind);
1812         }
1813
1814         return ops;
1815 }
1816
1817 static bool link_master_filtered(struct net_device *dev, int master_idx)
1818 {
1819         struct net_device *master;
1820
1821         if (!master_idx)
1822                 return false;
1823
1824         master = netdev_master_upper_dev_get(dev);
1825         if (!master || master->ifindex != master_idx)
1826                 return true;
1827
1828         return false;
1829 }
1830
1831 static bool link_kind_filtered(const struct net_device *dev,
1832                                const struct rtnl_link_ops *kind_ops)
1833 {
1834         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1835                 return true;
1836
1837         return false;
1838 }
1839
1840 static bool link_dump_filtered(struct net_device *dev,
1841                                int master_idx,
1842                                const struct rtnl_link_ops *kind_ops)
1843 {
1844         if (link_master_filtered(dev, master_idx) ||
1845             link_kind_filtered(dev, kind_ops))
1846                 return true;
1847
1848         return false;
1849 }
1850
1851 /**
1852  * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
1853  * @sk: netlink socket
1854  * @netnsid: network namespace identifier
1855  *
1856  * Returns the network namespace identified by netnsid on success or an error
1857  * pointer on failure.
1858  */
1859 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
1860 {
1861         struct net *net;
1862
1863         net = get_net_ns_by_id(sock_net(sk), netnsid);
1864         if (!net)
1865                 return ERR_PTR(-EINVAL);
1866
1867         /* For now, the caller is required to have CAP_NET_ADMIN in
1868          * the user namespace owning the target net ns.
1869          */
1870         if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
1871                 put_net(net);
1872                 return ERR_PTR(-EACCES);
1873         }
1874         return net;
1875 }
1876 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
1877
1878 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
1879                                       bool strict_check, struct nlattr **tb,
1880                                       struct netlink_ext_ack *extack)
1881 {
1882         int hdrlen;
1883
1884         if (strict_check) {
1885                 struct ifinfomsg *ifm;
1886
1887                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1888                         NL_SET_ERR_MSG(extack, "Invalid header for link dump");
1889                         return -EINVAL;
1890                 }
1891
1892                 ifm = nlmsg_data(nlh);
1893                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
1894                     ifm->ifi_change) {
1895                         NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
1896                         return -EINVAL;
1897                 }
1898                 if (ifm->ifi_index) {
1899                         NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
1900                         return -EINVAL;
1901                 }
1902
1903                 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
1904                                                      IFLA_MAX, ifla_policy,
1905                                                      extack);
1906         }
1907
1908         /* A hack to preserve kernel<->userspace interface.
1909          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1910          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1911          * what iproute2 < v3.9.0 used.
1912          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1913          * attribute, its netlink message is shorter than struct ifinfomsg.
1914          */
1915         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
1916                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1917
1918         return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
1919                                       extack);
1920 }
1921
1922 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1923 {
1924         struct netlink_ext_ack *extack = cb->extack;
1925         const struct nlmsghdr *nlh = cb->nlh;
1926         struct net *net = sock_net(skb->sk);
1927         struct net *tgt_net = net;
1928         int h, s_h;
1929         int idx = 0, s_idx;
1930         struct net_device *dev;
1931         struct hlist_head *head;
1932         struct nlattr *tb[IFLA_MAX+1];
1933         u32 ext_filter_mask = 0;
1934         const struct rtnl_link_ops *kind_ops = NULL;
1935         unsigned int flags = NLM_F_MULTI;
1936         int master_idx = 0;
1937         int netnsid = -1;
1938         int err, i;
1939
1940         s_h = cb->args[0];
1941         s_idx = cb->args[1];
1942
1943         err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
1944         if (err < 0) {
1945                 if (cb->strict_check)
1946                         return err;
1947
1948                 goto walk_entries;
1949         }
1950
1951         for (i = 0; i <= IFLA_MAX; ++i) {
1952                 if (!tb[i])
1953                         continue;
1954
1955                 /* new attributes should only be added with strict checking */
1956                 switch (i) {
1957                 case IFLA_TARGET_NETNSID:
1958                         netnsid = nla_get_s32(tb[i]);
1959                         tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
1960                         if (IS_ERR(tgt_net)) {
1961                                 NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
1962                                 return PTR_ERR(tgt_net);
1963                         }
1964                         break;
1965                 case IFLA_EXT_MASK:
1966                         ext_filter_mask = nla_get_u32(tb[i]);
1967                         break;
1968                 case IFLA_MASTER:
1969                         master_idx = nla_get_u32(tb[i]);
1970                         break;
1971                 case IFLA_LINKINFO:
1972                         kind_ops = linkinfo_to_kind_ops(tb[i]);
1973                         break;
1974                 default:
1975                         if (cb->strict_check) {
1976                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
1977                                 return -EINVAL;
1978                         }
1979                 }
1980         }
1981
1982         if (master_idx || kind_ops)
1983                 flags |= NLM_F_DUMP_FILTERED;
1984
1985 walk_entries:
1986         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1987                 idx = 0;
1988                 head = &tgt_net->dev_index_head[h];
1989                 hlist_for_each_entry(dev, head, index_hlist) {
1990                         if (link_dump_filtered(dev, master_idx, kind_ops))
1991                                 goto cont;
1992                         if (idx < s_idx)
1993                                 goto cont;
1994                         err = rtnl_fill_ifinfo(skb, dev, net,
1995                                                RTM_NEWLINK,
1996                                                NETLINK_CB(cb->skb).portid,
1997                                                nlh->nlmsg_seq, 0, flags,
1998                                                ext_filter_mask, 0, NULL, 0,
1999                                                netnsid);
2000
2001                         if (err < 0) {
2002                                 if (likely(skb->len))
2003                                         goto out;
2004
2005                                 goto out_err;
2006                         }
2007 cont:
2008                         idx++;
2009                 }
2010         }
2011 out:
2012         err = skb->len;
2013 out_err:
2014         cb->args[1] = idx;
2015         cb->args[0] = h;
2016         cb->seq = net->dev_base_seq;
2017         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2018         if (netnsid >= 0)
2019                 put_net(tgt_net);
2020
2021         return err;
2022 }
2023
2024 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2025                         struct netlink_ext_ack *exterr)
2026 {
2027         return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
2028                                     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_deprecated(vfinfo, IFLA_VF_MAX,
2574                                                           attr,
2575                                                           ifla_vf_policy,
2576                                                           NULL);
2577                         if (err < 0)
2578                                 goto errout;
2579                         err = do_setvfinfo(dev, vfinfo);
2580                         if (err < 0)
2581                                 goto errout;
2582                         status |= DO_SETLINK_NOTIFY;
2583                 }
2584         }
2585         err = 0;
2586
2587         if (tb[IFLA_VF_PORTS]) {
2588                 struct nlattr *port[IFLA_PORT_MAX+1];
2589                 struct nlattr *attr;
2590                 int vf;
2591                 int rem;
2592
2593                 err = -EOPNOTSUPP;
2594                 if (!ops->ndo_set_vf_port)
2595                         goto errout;
2596
2597                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2598                         if (nla_type(attr) != IFLA_VF_PORT ||
2599                             nla_len(attr) < NLA_HDRLEN) {
2600                                 err = -EINVAL;
2601                                 goto errout;
2602                         }
2603                         err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2604                                                           attr,
2605                                                           ifla_port_policy,
2606                                                           NULL);
2607                         if (err < 0)
2608                                 goto errout;
2609                         if (!port[IFLA_PORT_VF]) {
2610                                 err = -EOPNOTSUPP;
2611                                 goto errout;
2612                         }
2613                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2614                         err = ops->ndo_set_vf_port(dev, vf, port);
2615                         if (err < 0)
2616                                 goto errout;
2617                         status |= DO_SETLINK_NOTIFY;
2618                 }
2619         }
2620         err = 0;
2621
2622         if (tb[IFLA_PORT_SELF]) {
2623                 struct nlattr *port[IFLA_PORT_MAX+1];
2624
2625                 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2626                                                   tb[IFLA_PORT_SELF],
2627                                                   ifla_port_policy, NULL);
2628                 if (err < 0)
2629                         goto errout;
2630
2631                 err = -EOPNOTSUPP;
2632                 if (ops->ndo_set_vf_port)
2633                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2634                 if (err < 0)
2635                         goto errout;
2636                 status |= DO_SETLINK_NOTIFY;
2637         }
2638
2639         if (tb[IFLA_AF_SPEC]) {
2640                 struct nlattr *af;
2641                 int rem;
2642
2643                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2644                         const struct rtnl_af_ops *af_ops;
2645
2646                         rcu_read_lock();
2647
2648                         BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2649
2650                         err = af_ops->set_link_af(dev, af);
2651                         if (err < 0) {
2652                                 rcu_read_unlock();
2653                                 goto errout;
2654                         }
2655
2656                         rcu_read_unlock();
2657                         status |= DO_SETLINK_NOTIFY;
2658                 }
2659         }
2660         err = 0;
2661
2662         if (tb[IFLA_PROTO_DOWN]) {
2663                 err = dev_change_proto_down(dev,
2664                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2665                 if (err)
2666                         goto errout;
2667                 status |= DO_SETLINK_NOTIFY;
2668         }
2669
2670         if (tb[IFLA_XDP]) {
2671                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2672                 u32 xdp_flags = 0;
2673
2674                 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
2675                                                   tb[IFLA_XDP],
2676                                                   ifla_xdp_policy, NULL);
2677                 if (err < 0)
2678                         goto errout;
2679
2680                 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2681                         err = -EINVAL;
2682                         goto errout;
2683                 }
2684
2685                 if (xdp[IFLA_XDP_FLAGS]) {
2686                         xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2687                         if (xdp_flags & ~XDP_FLAGS_MASK) {
2688                                 err = -EINVAL;
2689                                 goto errout;
2690                         }
2691                         if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2692                                 err = -EINVAL;
2693                                 goto errout;
2694                         }
2695                 }
2696
2697                 if (xdp[IFLA_XDP_FD]) {
2698                         err = dev_change_xdp_fd(dev, extack,
2699                                                 nla_get_s32(xdp[IFLA_XDP_FD]),
2700                                                 xdp_flags);
2701                         if (err)
2702                                 goto errout;
2703                         status |= DO_SETLINK_NOTIFY;
2704                 }
2705         }
2706
2707 errout:
2708         if (status & DO_SETLINK_MODIFIED) {
2709                 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2710                         netdev_state_change(dev);
2711
2712                 if (err < 0)
2713                         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",
2714                                              dev->name);
2715         }
2716
2717         return err;
2718 }
2719
2720 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2721                         struct netlink_ext_ack *extack)
2722 {
2723         struct net *net = sock_net(skb->sk);
2724         struct ifinfomsg *ifm;
2725         struct net_device *dev;
2726         int err;
2727         struct nlattr *tb[IFLA_MAX+1];
2728         char ifname[IFNAMSIZ];
2729
2730         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2731                                      ifla_policy, extack);
2732         if (err < 0)
2733                 goto errout;
2734
2735         err = rtnl_ensure_unique_netns(tb, extack, false);
2736         if (err < 0)
2737                 goto errout;
2738
2739         if (tb[IFLA_IFNAME])
2740                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2741         else
2742                 ifname[0] = '\0';
2743
2744         err = -EINVAL;
2745         ifm = nlmsg_data(nlh);
2746         if (ifm->ifi_index > 0)
2747                 dev = __dev_get_by_index(net, ifm->ifi_index);
2748         else if (tb[IFLA_IFNAME])
2749                 dev = __dev_get_by_name(net, ifname);
2750         else
2751                 goto errout;
2752
2753         if (dev == NULL) {
2754                 err = -ENODEV;
2755                 goto errout;
2756         }
2757
2758         err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2759 errout:
2760         return err;
2761 }
2762
2763 static int rtnl_group_dellink(const struct net *net, int group)
2764 {
2765         struct net_device *dev, *aux;
2766         LIST_HEAD(list_kill);
2767         bool found = false;
2768
2769         if (!group)
2770                 return -EPERM;
2771
2772         for_each_netdev(net, dev) {
2773                 if (dev->group == group) {
2774                         const struct rtnl_link_ops *ops;
2775
2776                         found = true;
2777                         ops = dev->rtnl_link_ops;
2778                         if (!ops || !ops->dellink)
2779                                 return -EOPNOTSUPP;
2780                 }
2781         }
2782
2783         if (!found)
2784                 return -ENODEV;
2785
2786         for_each_netdev_safe(net, dev, aux) {
2787                 if (dev->group == group) {
2788                         const struct rtnl_link_ops *ops;
2789
2790                         ops = dev->rtnl_link_ops;
2791                         ops->dellink(dev, &list_kill);
2792                 }
2793         }
2794         unregister_netdevice_many(&list_kill);
2795
2796         return 0;
2797 }
2798
2799 int rtnl_delete_link(struct net_device *dev)
2800 {
2801         const struct rtnl_link_ops *ops;
2802         LIST_HEAD(list_kill);
2803
2804         ops = dev->rtnl_link_ops;
2805         if (!ops || !ops->dellink)
2806                 return -EOPNOTSUPP;
2807
2808         ops->dellink(dev, &list_kill);
2809         unregister_netdevice_many(&list_kill);
2810
2811         return 0;
2812 }
2813 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2814
2815 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2816                         struct netlink_ext_ack *extack)
2817 {
2818         struct net *net = sock_net(skb->sk);
2819         struct net *tgt_net = net;
2820         struct net_device *dev = NULL;
2821         struct ifinfomsg *ifm;
2822         char ifname[IFNAMSIZ];
2823         struct nlattr *tb[IFLA_MAX+1];
2824         int err;
2825         int netnsid = -1;
2826
2827         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2828                                      ifla_policy, extack);
2829         if (err < 0)
2830                 return err;
2831
2832         err = rtnl_ensure_unique_netns(tb, extack, true);
2833         if (err < 0)
2834                 return err;
2835
2836         if (tb[IFLA_IFNAME])
2837                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2838
2839         if (tb[IFLA_TARGET_NETNSID]) {
2840                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
2841                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
2842                 if (IS_ERR(tgt_net))
2843                         return PTR_ERR(tgt_net);
2844         }
2845
2846         err = -EINVAL;
2847         ifm = nlmsg_data(nlh);
2848         if (ifm->ifi_index > 0)
2849                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
2850         else if (tb[IFLA_IFNAME])
2851                 dev = __dev_get_by_name(tgt_net, ifname);
2852         else if (tb[IFLA_GROUP])
2853                 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
2854         else
2855                 goto out;
2856
2857         if (!dev) {
2858                 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
2859                         err = -ENODEV;
2860
2861                 goto out;
2862         }
2863
2864         err = rtnl_delete_link(dev);
2865
2866 out:
2867         if (netnsid >= 0)
2868                 put_net(tgt_net);
2869
2870         return err;
2871 }
2872
2873 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2874 {
2875         unsigned int old_flags;
2876         int err;
2877
2878         old_flags = dev->flags;
2879         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2880                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2881                                          NULL);
2882                 if (err < 0)
2883                         return err;
2884         }
2885
2886         if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
2887                 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
2888         } else {
2889                 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2890                 __dev_notify_flags(dev, old_flags, ~0U);
2891         }
2892         return 0;
2893 }
2894 EXPORT_SYMBOL(rtnl_configure_link);
2895
2896 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
2897                                     unsigned char name_assign_type,
2898                                     const struct rtnl_link_ops *ops,
2899                                     struct nlattr *tb[],
2900                                     struct netlink_ext_ack *extack)
2901 {
2902         struct net_device *dev;
2903         unsigned int num_tx_queues = 1;
2904         unsigned int num_rx_queues = 1;
2905
2906         if (tb[IFLA_NUM_TX_QUEUES])
2907                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2908         else if (ops->get_num_tx_queues)
2909                 num_tx_queues = ops->get_num_tx_queues();
2910
2911         if (tb[IFLA_NUM_RX_QUEUES])
2912                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2913         else if (ops->get_num_rx_queues)
2914                 num_rx_queues = ops->get_num_rx_queues();
2915
2916         if (num_tx_queues < 1 || num_tx_queues > 4096) {
2917                 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
2918                 return ERR_PTR(-EINVAL);
2919         }
2920
2921         if (num_rx_queues < 1 || num_rx_queues > 4096) {
2922                 NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
2923                 return ERR_PTR(-EINVAL);
2924         }
2925
2926         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2927                                ops->setup, num_tx_queues, num_rx_queues);
2928         if (!dev)
2929                 return ERR_PTR(-ENOMEM);
2930
2931         dev_net_set(dev, net);
2932         dev->rtnl_link_ops = ops;
2933         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2934
2935         if (tb[IFLA_MTU])
2936                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2937         if (tb[IFLA_ADDRESS]) {
2938                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2939                                 nla_len(tb[IFLA_ADDRESS]));
2940                 dev->addr_assign_type = NET_ADDR_SET;
2941         }
2942         if (tb[IFLA_BROADCAST])
2943                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2944                                 nla_len(tb[IFLA_BROADCAST]));
2945         if (tb[IFLA_TXQLEN])
2946                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2947         if (tb[IFLA_OPERSTATE])
2948                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2949         if (tb[IFLA_LINKMODE])
2950                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2951         if (tb[IFLA_GROUP])
2952                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2953         if (tb[IFLA_GSO_MAX_SIZE])
2954                 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
2955         if (tb[IFLA_GSO_MAX_SEGS])
2956                 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2957
2958         return dev;
2959 }
2960 EXPORT_SYMBOL(rtnl_create_link);
2961
2962 static int rtnl_group_changelink(const struct sk_buff *skb,
2963                 struct net *net, int group,
2964                 struct ifinfomsg *ifm,
2965                 struct netlink_ext_ack *extack,
2966                 struct nlattr **tb)
2967 {
2968         struct net_device *dev, *aux;
2969         int err;
2970
2971         for_each_netdev_safe(net, dev, aux) {
2972                 if (dev->group == group) {
2973                         err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
2974                         if (err < 0)
2975                                 return err;
2976                 }
2977         }
2978
2979         return 0;
2980 }
2981
2982 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2983                           struct nlattr **attr, struct netlink_ext_ack *extack)
2984 {
2985         struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
2986         unsigned char name_assign_type = NET_NAME_USER;
2987         struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
2988         const struct rtnl_link_ops *m_ops = NULL;
2989         struct net_device *master_dev = NULL;
2990         struct net *net = sock_net(skb->sk);
2991         const struct rtnl_link_ops *ops;
2992         struct nlattr *tb[IFLA_MAX + 1];
2993         struct net *dest_net, *link_net;
2994         struct nlattr **slave_data;
2995         char kind[MODULE_NAME_LEN];
2996         struct net_device *dev;
2997         struct ifinfomsg *ifm;
2998         char ifname[IFNAMSIZ];
2999         struct nlattr **data;
3000         int err;
3001
3002 #ifdef CONFIG_MODULES
3003 replay:
3004 #endif
3005         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3006                                      ifla_policy, extack);
3007         if (err < 0)
3008                 return err;
3009
3010         err = rtnl_ensure_unique_netns(tb, extack, false);
3011         if (err < 0)
3012                 return err;
3013
3014         if (tb[IFLA_IFNAME])
3015                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3016         else
3017                 ifname[0] = '\0';
3018
3019         ifm = nlmsg_data(nlh);
3020         if (ifm->ifi_index > 0)
3021                 dev = __dev_get_by_index(net, ifm->ifi_index);
3022         else {
3023                 if (ifname[0])
3024                         dev = __dev_get_by_name(net, ifname);
3025                 else
3026                         dev = NULL;
3027         }
3028
3029         if (dev) {
3030                 master_dev = netdev_master_upper_dev_get(dev);
3031                 if (master_dev)
3032                         m_ops = master_dev->rtnl_link_ops;
3033         }
3034
3035         err = validate_linkmsg(dev, tb);
3036         if (err < 0)
3037                 return err;
3038
3039         if (tb[IFLA_LINKINFO]) {
3040                 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3041                                                   tb[IFLA_LINKINFO],
3042                                                   ifla_info_policy, NULL);
3043                 if (err < 0)
3044                         return err;
3045         } else
3046                 memset(linkinfo, 0, sizeof(linkinfo));
3047
3048         if (linkinfo[IFLA_INFO_KIND]) {
3049                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3050                 ops = rtnl_link_ops_get(kind);
3051         } else {
3052                 kind[0] = '\0';
3053                 ops = NULL;
3054         }
3055
3056         data = NULL;
3057         if (ops) {
3058                 if (ops->maxtype > RTNL_MAX_TYPE)
3059                         return -EINVAL;
3060
3061                 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3062                         err = nla_parse_nested_deprecated(attr, ops->maxtype,
3063                                                           linkinfo[IFLA_INFO_DATA],
3064                                                           ops->policy, extack);
3065                         if (err < 0)
3066                                 return err;
3067                         data = attr;
3068                 }
3069                 if (ops->validate) {
3070                         err = ops->validate(tb, data, extack);
3071                         if (err < 0)
3072                                 return err;
3073                 }
3074         }
3075
3076         slave_data = NULL;
3077         if (m_ops) {
3078                 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3079                         return -EINVAL;
3080
3081                 if (m_ops->slave_maxtype &&
3082                     linkinfo[IFLA_INFO_SLAVE_DATA]) {
3083                         err = nla_parse_nested_deprecated(slave_attr,
3084                                                           m_ops->slave_maxtype,
3085                                                           linkinfo[IFLA_INFO_SLAVE_DATA],
3086                                                           m_ops->slave_policy,
3087                                                           extack);
3088                         if (err < 0)
3089                                 return err;
3090                         slave_data = slave_attr;
3091                 }
3092         }
3093
3094         if (dev) {
3095                 int status = 0;
3096
3097                 if (nlh->nlmsg_flags & NLM_F_EXCL)
3098                         return -EEXIST;
3099                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3100                         return -EOPNOTSUPP;
3101
3102                 if (linkinfo[IFLA_INFO_DATA]) {
3103                         if (!ops || ops != dev->rtnl_link_ops ||
3104                             !ops->changelink)
3105                                 return -EOPNOTSUPP;
3106
3107                         err = ops->changelink(dev, tb, data, extack);
3108                         if (err < 0)
3109                                 return err;
3110                         status |= DO_SETLINK_NOTIFY;
3111                 }
3112
3113                 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3114                         if (!m_ops || !m_ops->slave_changelink)
3115                                 return -EOPNOTSUPP;
3116
3117                         err = m_ops->slave_changelink(master_dev, dev, tb,
3118                                                       slave_data, extack);
3119                         if (err < 0)
3120                                 return err;
3121                         status |= DO_SETLINK_NOTIFY;
3122                 }
3123
3124                 return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
3125         }
3126
3127         if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3128                 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3129                         return rtnl_group_changelink(skb, net,
3130                                                 nla_get_u32(tb[IFLA_GROUP]),
3131                                                 ifm, extack, tb);
3132                 return -ENODEV;
3133         }
3134
3135         if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3136                 return -EOPNOTSUPP;
3137
3138         if (!ops) {
3139 #ifdef CONFIG_MODULES
3140                 if (kind[0]) {
3141                         __rtnl_unlock();
3142                         request_module("rtnl-link-%s", kind);
3143                         rtnl_lock();
3144                         ops = rtnl_link_ops_get(kind);
3145                         if (ops)
3146                                 goto replay;
3147                 }
3148 #endif
3149                 NL_SET_ERR_MSG(extack, "Unknown device type");
3150                 return -EOPNOTSUPP;
3151         }
3152
3153         if (!ops->setup)
3154                 return -EOPNOTSUPP;
3155
3156         if (!ifname[0]) {
3157                 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3158                 name_assign_type = NET_NAME_ENUM;
3159         }
3160
3161         dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3162         if (IS_ERR(dest_net))
3163                 return PTR_ERR(dest_net);
3164
3165         if (tb[IFLA_LINK_NETNSID]) {
3166                 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3167
3168                 link_net = get_net_ns_by_id(dest_net, id);
3169                 if (!link_net) {
3170                         NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3171                         err =  -EINVAL;
3172                         goto out;
3173                 }
3174                 err = -EPERM;
3175                 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3176                         goto out;
3177         } else {
3178                 link_net = NULL;
3179         }
3180
3181         dev = rtnl_create_link(link_net ? : dest_net, ifname,
3182                                name_assign_type, ops, tb, extack);
3183         if (IS_ERR(dev)) {
3184                 err = PTR_ERR(dev);
3185                 goto out;
3186         }
3187
3188         dev->ifindex = ifm->ifi_index;
3189
3190         if (ops->newlink) {
3191                 err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3192                 /* Drivers should call free_netdev() in ->destructor
3193                  * and unregister it on failure after registration
3194                  * so that device could be finally freed in rtnl_unlock.
3195                  */
3196                 if (err < 0) {
3197                         /* If device is not registered at all, free it now */
3198                         if (dev->reg_state == NETREG_UNINITIALIZED)
3199                                 free_netdev(dev);
3200                         goto out;
3201                 }
3202         } else {
3203                 err = register_netdevice(dev);
3204                 if (err < 0) {
3205                         free_netdev(dev);
3206                         goto out;
3207                 }
3208         }
3209         err = rtnl_configure_link(dev, ifm);
3210         if (err < 0)
3211                 goto out_unregister;
3212         if (link_net) {
3213                 err = dev_change_net_namespace(dev, dest_net, ifname);
3214                 if (err < 0)
3215                         goto out_unregister;
3216         }
3217         if (tb[IFLA_MASTER]) {
3218                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3219                 if (err)
3220                         goto out_unregister;
3221         }
3222 out:
3223         if (link_net)
3224                 put_net(link_net);
3225         put_net(dest_net);
3226         return err;
3227 out_unregister:
3228         if (ops->newlink) {
3229                 LIST_HEAD(list_kill);
3230
3231                 ops->dellink(dev, &list_kill);
3232                 unregister_netdevice_many(&list_kill);
3233         } else {
3234                 unregister_netdevice(dev);
3235         }
3236         goto out;
3237 }
3238
3239 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3240                         struct netlink_ext_ack *extack)
3241 {
3242         struct nlattr **attr;
3243         int ret;
3244
3245         attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
3246         if (!attr)
3247                 return -ENOMEM;
3248
3249         ret = __rtnl_newlink(skb, nlh, attr, extack);
3250         kfree(attr);
3251         return ret;
3252 }
3253
3254 static int rtnl_valid_getlink_req(struct sk_buff *skb,
3255                                   const struct nlmsghdr *nlh,
3256                                   struct nlattr **tb,
3257                                   struct netlink_ext_ack *extack)
3258 {
3259         struct ifinfomsg *ifm;
3260         int i, err;
3261
3262         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3263                 NL_SET_ERR_MSG(extack, "Invalid header for get link");
3264                 return -EINVAL;
3265         }
3266
3267         if (!netlink_strict_get_check(skb))
3268                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3269                                               ifla_policy, extack);
3270
3271         ifm = nlmsg_data(nlh);
3272         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3273             ifm->ifi_change) {
3274                 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3275                 return -EINVAL;
3276         }
3277
3278         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3279                                             ifla_policy, extack);
3280         if (err)
3281                 return err;
3282
3283         for (i = 0; i <= IFLA_MAX; i++) {
3284                 if (!tb[i])
3285                         continue;
3286
3287                 switch (i) {
3288                 case IFLA_IFNAME:
3289                 case IFLA_EXT_MASK:
3290                 case IFLA_TARGET_NETNSID:
3291                         break;
3292                 default:
3293                         NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3294                         return -EINVAL;
3295                 }
3296         }
3297
3298         return 0;
3299 }
3300
3301 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3302                         struct netlink_ext_ack *extack)
3303 {
3304         struct net *net = sock_net(skb->sk);
3305         struct net *tgt_net = net;
3306         struct ifinfomsg *ifm;
3307         char ifname[IFNAMSIZ];
3308         struct nlattr *tb[IFLA_MAX+1];
3309         struct net_device *dev = NULL;
3310         struct sk_buff *nskb;
3311         int netnsid = -1;
3312         int err;
3313         u32 ext_filter_mask = 0;
3314
3315         err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3316         if (err < 0)
3317                 return err;
3318
3319         err = rtnl_ensure_unique_netns(tb, extack, true);
3320         if (err < 0)
3321                 return err;
3322
3323         if (tb[IFLA_TARGET_NETNSID]) {
3324                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3325                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3326                 if (IS_ERR(tgt_net))
3327                         return PTR_ERR(tgt_net);
3328         }
3329
3330         if (tb[IFLA_IFNAME])
3331                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3332
3333         if (tb[IFLA_EXT_MASK])
3334                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3335
3336         err = -EINVAL;
3337         ifm = nlmsg_data(nlh);
3338         if (ifm->ifi_index > 0)
3339                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3340         else if (tb[IFLA_IFNAME])
3341                 dev = __dev_get_by_name(tgt_net, ifname);
3342         else
3343                 goto out;
3344
3345         err = -ENODEV;
3346         if (dev == NULL)
3347                 goto out;
3348
3349         err = -ENOBUFS;
3350         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3351         if (nskb == NULL)
3352                 goto out;
3353
3354         err = rtnl_fill_ifinfo(nskb, dev, net,
3355                                RTM_NEWLINK, NETLINK_CB(skb).portid,
3356                                nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3357                                0, NULL, 0, netnsid);
3358         if (err < 0) {
3359                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3360                 WARN_ON(err == -EMSGSIZE);
3361                 kfree_skb(nskb);
3362         } else
3363                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3364 out:
3365         if (netnsid >= 0)
3366                 put_net(tgt_net);
3367
3368         return err;
3369 }
3370
3371 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3372 {
3373         struct net *net = sock_net(skb->sk);
3374         struct net_device *dev;
3375         struct nlattr *tb[IFLA_MAX+1];
3376         u32 ext_filter_mask = 0;
3377         u16 min_ifinfo_dump_size = 0;
3378         int hdrlen;
3379
3380         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3381         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3382                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3383
3384         if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3385                 if (tb[IFLA_EXT_MASK])
3386                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3387         }
3388
3389         if (!ext_filter_mask)
3390                 return NLMSG_GOODSIZE;
3391         /*
3392          * traverse the list of net devices and compute the minimum
3393          * buffer size based upon the filter mask.
3394          */
3395         rcu_read_lock();
3396         for_each_netdev_rcu(net, dev) {
3397                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
3398                                              if_nlmsg_size(dev,
3399                                                            ext_filter_mask));
3400         }
3401         rcu_read_unlock();
3402
3403         return nlmsg_total_size(min_ifinfo_dump_size);
3404 }
3405
3406 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3407 {
3408         int idx;
3409         int s_idx = cb->family;
3410         int type = cb->nlh->nlmsg_type - RTM_BASE;
3411         int ret = 0;
3412
3413         if (s_idx == 0)
3414                 s_idx = 1;
3415
3416         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3417                 struct rtnl_link **tab;
3418                 struct rtnl_link *link;
3419                 rtnl_dumpit_func dumpit;
3420
3421                 if (idx < s_idx || idx == PF_PACKET)
3422                         continue;
3423
3424                 if (type < 0 || type >= RTM_NR_MSGTYPES)
3425                         continue;
3426
3427                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3428                 if (!tab)
3429                         continue;
3430
3431                 link = tab[type];
3432                 if (!link)
3433                         continue;
3434
3435                 dumpit = link->dumpit;
3436                 if (!dumpit)
3437                         continue;
3438
3439                 if (idx > s_idx) {
3440                         memset(&cb->args[0], 0, sizeof(cb->args));
3441                         cb->prev_seq = 0;
3442                         cb->seq = 0;
3443                 }
3444                 ret = dumpit(skb, cb);
3445                 if (ret)
3446                         break;
3447         }
3448         cb->family = idx;
3449
3450         return skb->len ? : ret;
3451 }
3452
3453 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3454                                        unsigned int change,
3455                                        u32 event, gfp_t flags, int *new_nsid,
3456                                        int new_ifindex)
3457 {
3458         struct net *net = dev_net(dev);
3459         struct sk_buff *skb;
3460         int err = -ENOBUFS;
3461         size_t if_info_size;
3462
3463         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3464         if (skb == NULL)
3465                 goto errout;
3466
3467         err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3468                                type, 0, 0, change, 0, 0, event,
3469                                new_nsid, new_ifindex, -1);
3470         if (err < 0) {
3471                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3472                 WARN_ON(err == -EMSGSIZE);
3473                 kfree_skb(skb);
3474                 goto errout;
3475         }
3476         return skb;
3477 errout:
3478         if (err < 0)
3479                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3480         return NULL;
3481 }
3482
3483 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3484 {
3485         struct net *net = dev_net(dev);
3486
3487         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3488 }
3489
3490 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3491                                unsigned int change, u32 event,
3492                                gfp_t flags, int *new_nsid, int new_ifindex)
3493 {
3494         struct sk_buff *skb;
3495
3496         if (dev->reg_state != NETREG_REGISTERED)
3497                 return;
3498
3499         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3500                                      new_ifindex);
3501         if (skb)
3502                 rtmsg_ifinfo_send(skb, dev, flags);
3503 }
3504
3505 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3506                   gfp_t flags)
3507 {
3508         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3509                            NULL, 0);
3510 }
3511
3512 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3513                          gfp_t flags, int *new_nsid, int new_ifindex)
3514 {
3515         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3516                            new_nsid, new_ifindex);
3517 }
3518
3519 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3520                                    struct net_device *dev,
3521                                    u8 *addr, u16 vid, u32 pid, u32 seq,
3522                                    int type, unsigned int flags,
3523                                    int nlflags, u16 ndm_state)
3524 {
3525         struct nlmsghdr *nlh;
3526         struct ndmsg *ndm;
3527
3528         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3529         if (!nlh)
3530                 return -EMSGSIZE;
3531
3532         ndm = nlmsg_data(nlh);
3533         ndm->ndm_family  = AF_BRIDGE;
3534         ndm->ndm_pad1    = 0;
3535         ndm->ndm_pad2    = 0;
3536         ndm->ndm_flags   = flags;
3537         ndm->ndm_type    = 0;
3538         ndm->ndm_ifindex = dev->ifindex;
3539         ndm->ndm_state   = ndm_state;
3540
3541         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3542                 goto nla_put_failure;
3543         if (vid)
3544                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3545                         goto nla_put_failure;
3546
3547         nlmsg_end(skb, nlh);
3548         return 0;
3549
3550 nla_put_failure:
3551         nlmsg_cancel(skb, nlh);
3552         return -EMSGSIZE;
3553 }
3554
3555 static inline size_t rtnl_fdb_nlmsg_size(void)
3556 {
3557         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3558                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
3559                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
3560                0;
3561 }
3562
3563 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3564                             u16 ndm_state)
3565 {
3566         struct net *net = dev_net(dev);
3567         struct sk_buff *skb;
3568         int err = -ENOBUFS;
3569
3570         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3571         if (!skb)
3572                 goto errout;
3573
3574         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3575                                       0, 0, type, NTF_SELF, 0, ndm_state);
3576         if (err < 0) {
3577                 kfree_skb(skb);
3578                 goto errout;
3579         }
3580
3581         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3582         return;
3583 errout:
3584         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3585 }
3586
3587 /*
3588  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3589  */
3590 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3591                      struct nlattr *tb[],
3592                      struct net_device *dev,
3593                      const unsigned char *addr, u16 vid,
3594                      u16 flags)
3595 {
3596         int err = -EINVAL;
3597
3598         /* If aging addresses are supported device will need to
3599          * implement its own handler for this.
3600          */
3601         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3602                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3603                 return err;
3604         }
3605
3606         if (vid) {
3607                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3608                 return err;
3609         }
3610
3611         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3612                 err = dev_uc_add_excl(dev, addr);
3613         else if (is_multicast_ether_addr(addr))
3614                 err = dev_mc_add_excl(dev, addr);
3615
3616         /* Only return duplicate errors if NLM_F_EXCL is set */
3617         if (err == -EEXIST && !(flags & NLM_F_EXCL))
3618                 err = 0;
3619
3620         return err;
3621 }
3622 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3623
3624 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3625                          struct netlink_ext_ack *extack)
3626 {
3627         u16 vid = 0;
3628
3629         if (vlan_attr) {
3630                 if (nla_len(vlan_attr) != sizeof(u16)) {
3631                         NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3632                         return -EINVAL;
3633                 }
3634
3635                 vid = nla_get_u16(vlan_attr);
3636
3637                 if (!vid || vid >= VLAN_VID_MASK) {
3638                         NL_SET_ERR_MSG(extack, "invalid vlan id");
3639                         return -EINVAL;
3640                 }
3641         }
3642         *p_vid = vid;
3643         return 0;
3644 }
3645
3646 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3647                         struct netlink_ext_ack *extack)
3648 {
3649         struct net *net = sock_net(skb->sk);
3650         struct ndmsg *ndm;
3651         struct nlattr *tb[NDA_MAX+1];
3652         struct net_device *dev;
3653         u8 *addr;
3654         u16 vid;
3655         int err;
3656
3657         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3658                                      extack);
3659         if (err < 0)
3660                 return err;
3661
3662         ndm = nlmsg_data(nlh);
3663         if (ndm->ndm_ifindex == 0) {
3664                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3665                 return -EINVAL;
3666         }
3667
3668         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3669         if (dev == NULL) {
3670                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3671                 return -ENODEV;
3672         }
3673
3674         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3675                 NL_SET_ERR_MSG(extack, "invalid address");
3676                 return -EINVAL;
3677         }
3678
3679         if (dev->type != ARPHRD_ETHER) {
3680                 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
3681                 return -EINVAL;
3682         }
3683
3684         addr = nla_data(tb[NDA_LLADDR]);
3685
3686         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3687         if (err)
3688                 return err;
3689
3690         err = -EOPNOTSUPP;
3691
3692         /* Support fdb on master device the net/bridge default case */
3693         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3694             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3695                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3696                 const struct net_device_ops *ops = br_dev->netdev_ops;
3697
3698                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3699                                        nlh->nlmsg_flags, extack);
3700                 if (err)
3701                         goto out;
3702                 else
3703                         ndm->ndm_flags &= ~NTF_MASTER;
3704         }
3705
3706         /* Embedded bridge, macvlan, and any other device support */
3707         if ((ndm->ndm_flags & NTF_SELF)) {
3708                 if (dev->netdev_ops->ndo_fdb_add)
3709                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3710                                                            vid,
3711                                                            nlh->nlmsg_flags,
3712                                                            extack);
3713                 else
3714                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3715                                                nlh->nlmsg_flags);
3716
3717                 if (!err) {
3718                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3719                                         ndm->ndm_state);
3720                         ndm->ndm_flags &= ~NTF_SELF;
3721                 }
3722         }
3723 out:
3724         return err;
3725 }
3726
3727 /*
3728  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3729  */
3730 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3731                      struct nlattr *tb[],
3732                      struct net_device *dev,
3733                      const unsigned char *addr, u16 vid)
3734 {
3735         int err = -EINVAL;
3736
3737         /* If aging addresses are supported device will need to
3738          * implement its own handler for this.
3739          */
3740         if (!(ndm->ndm_state & NUD_PERMANENT)) {
3741                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3742                 return err;
3743         }
3744
3745         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3746                 err = dev_uc_del(dev, addr);
3747         else if (is_multicast_ether_addr(addr))
3748                 err = dev_mc_del(dev, addr);
3749
3750         return err;
3751 }
3752 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3753
3754 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3755                         struct netlink_ext_ack *extack)
3756 {
3757         struct net *net = sock_net(skb->sk);
3758         struct ndmsg *ndm;
3759         struct nlattr *tb[NDA_MAX+1];
3760         struct net_device *dev;
3761         int err = -EINVAL;
3762         __u8 *addr;
3763         u16 vid;
3764
3765         if (!netlink_capable(skb, CAP_NET_ADMIN))
3766                 return -EPERM;
3767
3768         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3769                                      extack);
3770         if (err < 0)
3771                 return err;
3772
3773         ndm = nlmsg_data(nlh);
3774         if (ndm->ndm_ifindex == 0) {
3775                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3776                 return -EINVAL;
3777         }
3778
3779         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3780         if (dev == NULL) {
3781                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3782                 return -ENODEV;
3783         }
3784
3785         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3786                 NL_SET_ERR_MSG(extack, "invalid address");
3787                 return -EINVAL;
3788         }
3789
3790         if (dev->type != ARPHRD_ETHER) {
3791                 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
3792                 return -EINVAL;
3793         }
3794
3795         addr = nla_data(tb[NDA_LLADDR]);
3796
3797         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3798         if (err)
3799                 return err;
3800
3801         err = -EOPNOTSUPP;
3802
3803         /* Support fdb on master device the net/bridge default case */
3804         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3805             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3806                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3807                 const struct net_device_ops *ops = br_dev->netdev_ops;
3808
3809                 if (ops->ndo_fdb_del)
3810                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3811
3812                 if (err)
3813                         goto out;
3814                 else
3815                         ndm->ndm_flags &= ~NTF_MASTER;
3816         }
3817
3818         /* Embedded bridge, macvlan, and any other device support */
3819         if (ndm->ndm_flags & NTF_SELF) {
3820                 if (dev->netdev_ops->ndo_fdb_del)
3821                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3822                                                            vid);
3823                 else
3824                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3825
3826                 if (!err) {
3827                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3828                                         ndm->ndm_state);
3829                         ndm->ndm_flags &= ~NTF_SELF;
3830                 }
3831         }
3832 out:
3833         return err;
3834 }
3835
3836 static int nlmsg_populate_fdb(struct sk_buff *skb,
3837                               struct netlink_callback *cb,
3838                               struct net_device *dev,
3839                               int *idx,
3840                               struct netdev_hw_addr_list *list)
3841 {
3842         struct netdev_hw_addr *ha;
3843         int err;
3844         u32 portid, seq;
3845
3846         portid = NETLINK_CB(cb->skb).portid;
3847         seq = cb->nlh->nlmsg_seq;
3848
3849         list_for_each_entry(ha, &list->list, list) {
3850                 if (*idx < cb->args[2])
3851                         goto skip;
3852
3853                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3854                                               portid, seq,
3855                                               RTM_NEWNEIGH, NTF_SELF,
3856                                               NLM_F_MULTI, NUD_PERMANENT);
3857                 if (err < 0)
3858                         return err;
3859 skip:
3860                 *idx += 1;
3861         }
3862         return 0;
3863 }
3864
3865 /**
3866  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3867  * @skb: socket buffer to store message in
3868  * @cb: netlink callback
3869  * @dev: netdevice
3870  * @filter_dev: ignored
3871  * @idx: the number of FDB table entries dumped is added to *@idx
3872  *
3873  * Default netdevice operation to dump the existing unicast address list.
3874  * Returns number of addresses from list put in skb.
3875  */
3876 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3877                       struct netlink_callback *cb,
3878                       struct net_device *dev,
3879                       struct net_device *filter_dev,
3880                       int *idx)
3881 {
3882         int err;
3883
3884         if (dev->type != ARPHRD_ETHER)
3885                 return -EINVAL;
3886
3887         netif_addr_lock_bh(dev);
3888         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3889         if (err)
3890                 goto out;
3891         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3892 out:
3893         netif_addr_unlock_bh(dev);
3894         return err;
3895 }
3896 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3897
3898 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
3899                                  int *br_idx, int *brport_idx,
3900                                  struct netlink_ext_ack *extack)
3901 {
3902         struct nlattr *tb[NDA_MAX + 1];
3903         struct ndmsg *ndm;
3904         int err, i;
3905
3906         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
3907                 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
3908                 return -EINVAL;
3909         }
3910
3911         ndm = nlmsg_data(nlh);
3912         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
3913             ndm->ndm_flags || ndm->ndm_type) {
3914                 NL_SET_ERR_MSG(extack, "Invalid values in header for fbd dump request");
3915                 return -EINVAL;
3916         }
3917
3918         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
3919                                             NDA_MAX, NULL, extack);
3920         if (err < 0)
3921                 return err;
3922
3923         *brport_idx = ndm->ndm_ifindex;
3924         for (i = 0; i <= NDA_MAX; ++i) {
3925                 if (!tb[i])
3926                         continue;
3927
3928                 switch (i) {
3929                 case NDA_IFINDEX:
3930                         if (nla_len(tb[i]) != sizeof(u32)) {
3931                                 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
3932                                 return -EINVAL;
3933                         }
3934                         *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
3935                         break;
3936                 case NDA_MASTER:
3937                         if (nla_len(tb[i]) != sizeof(u32)) {
3938                                 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
3939                                 return -EINVAL;
3940                         }
3941                         *br_idx = nla_get_u32(tb[NDA_MASTER]);
3942                         break;
3943                 default:
3944                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
3945                         return -EINVAL;
3946                 }
3947         }
3948
3949         return 0;
3950 }
3951
3952 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
3953                                  int *br_idx, int *brport_idx,
3954                                  struct netlink_ext_ack *extack)
3955 {
3956         struct nlattr *tb[IFLA_MAX+1];
3957         int err;
3958
3959         /* A hack to preserve kernel<->userspace interface.
3960          * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
3961          * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
3962          * So, check for ndmsg with an optional u32 attribute (not used here).
3963          * Fortunately these sizes don't conflict with the size of ifinfomsg
3964          * with an optional attribute.
3965          */
3966         if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
3967             (nlmsg_len(nlh) != sizeof(struct ndmsg) +
3968              nla_attr_size(sizeof(u32)))) {
3969                 struct ifinfomsg *ifm;
3970
3971                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
3972                                              tb, IFLA_MAX, ifla_policy,
3973                                              extack);
3974                 if (err < 0) {
3975                         return -EINVAL;
3976                 } else if (err == 0) {
3977                         if (tb[IFLA_MASTER])
3978                                 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
3979                 }
3980
3981                 ifm = nlmsg_data(nlh);
3982                 *brport_idx = ifm->ifi_index;
3983         }
3984         return 0;
3985 }
3986
3987 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3988 {
3989         struct net_device *dev;
3990         struct net_device *br_dev = NULL;
3991         const struct net_device_ops *ops = NULL;
3992         const struct net_device_ops *cops = NULL;
3993         struct net *net = sock_net(skb->sk);
3994         struct hlist_head *head;
3995         int brport_idx = 0;
3996         int br_idx = 0;
3997         int h, s_h;
3998         int idx = 0, s_idx;
3999         int err = 0;
4000         int fidx = 0;
4001
4002         if (cb->strict_check)
4003                 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4004                                             cb->extack);
4005         else
4006                 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4007                                             cb->extack);
4008         if (err < 0)
4009                 return err;
4010
4011         if (br_idx) {
4012                 br_dev = __dev_get_by_index(net, br_idx);
4013                 if (!br_dev)
4014                         return -ENODEV;
4015
4016                 ops = br_dev->netdev_ops;
4017         }
4018
4019         s_h = cb->args[0];
4020         s_idx = cb->args[1];
4021
4022         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4023                 idx = 0;
4024                 head = &net->dev_index_head[h];
4025                 hlist_for_each_entry(dev, head, index_hlist) {
4026
4027                         if (brport_idx && (dev->ifindex != brport_idx))
4028                                 continue;
4029
4030                         if (!br_idx) { /* user did not specify a specific bridge */
4031                                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
4032                                         br_dev = netdev_master_upper_dev_get(dev);
4033                                         cops = br_dev->netdev_ops;
4034                                 }
4035                         } else {
4036                                 if (dev != br_dev &&
4037                                     !(dev->priv_flags & IFF_BRIDGE_PORT))
4038                                         continue;
4039
4040                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
4041                                     !(dev->priv_flags & IFF_EBRIDGE))
4042                                         continue;
4043                                 cops = ops;
4044                         }
4045
4046                         if (idx < s_idx)
4047                                 goto cont;
4048
4049                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
4050                                 if (cops && cops->ndo_fdb_dump) {
4051                                         err = cops->ndo_fdb_dump(skb, cb,
4052                                                                 br_dev, dev,
4053                                                                 &fidx);
4054                                         if (err == -EMSGSIZE)
4055                                                 goto out;
4056                                 }
4057                         }
4058
4059                         if (dev->netdev_ops->ndo_fdb_dump)
4060                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4061                                                                     dev, NULL,
4062                                                                     &fidx);
4063                         else
4064                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4065                                                         &fidx);
4066                         if (err == -EMSGSIZE)
4067                                 goto out;
4068
4069                         cops = NULL;
4070
4071                         /* reset fdb offset to 0 for rest of the interfaces */
4072                         cb->args[2] = 0;
4073                         fidx = 0;
4074 cont:
4075                         idx++;
4076                 }
4077         }
4078
4079 out:
4080         cb->args[0] = h;
4081         cb->args[1] = idx;
4082         cb->args[2] = fidx;
4083
4084         return skb->len;
4085 }
4086
4087 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4088                                 struct nlattr **tb, u8 *ndm_flags,
4089                                 int *br_idx, int *brport_idx, u8 **addr,
4090                                 u16 *vid, struct netlink_ext_ack *extack)
4091 {
4092         struct ndmsg *ndm;
4093         int err, i;
4094
4095         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4096                 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4097                 return -EINVAL;
4098         }
4099
4100         ndm = nlmsg_data(nlh);
4101         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4102             ndm->ndm_type) {
4103                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4104                 return -EINVAL;
4105         }
4106
4107         if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4108                 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4109                 return -EINVAL;
4110         }
4111
4112         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4113                                             NDA_MAX, nda_policy, extack);
4114         if (err < 0)
4115                 return err;
4116
4117         *ndm_flags = ndm->ndm_flags;
4118         *brport_idx = ndm->ndm_ifindex;
4119         for (i = 0; i <= NDA_MAX; ++i) {
4120                 if (!tb[i])
4121                         continue;
4122
4123                 switch (i) {
4124                 case NDA_MASTER:
4125                         *br_idx = nla_get_u32(tb[i]);
4126                         break;
4127                 case NDA_LLADDR:
4128                         if (nla_len(tb[i]) != ETH_ALEN) {
4129                                 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4130                                 return -EINVAL;
4131                         }
4132                         *addr = nla_data(tb[i]);
4133                         break;
4134                 case NDA_VLAN:
4135                         err = fdb_vid_parse(tb[i], vid, extack);
4136                         if (err)
4137                                 return err;
4138                         break;
4139                 case NDA_VNI:
4140                         break;
4141                 default:
4142                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4143                         return -EINVAL;
4144                 }
4145         }
4146
4147         return 0;
4148 }
4149
4150 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4151                         struct netlink_ext_ack *extack)
4152 {
4153         struct net_device *dev = NULL, *br_dev = NULL;
4154         const struct net_device_ops *ops = NULL;
4155         struct net *net = sock_net(in_skb->sk);
4156         struct nlattr *tb[NDA_MAX + 1];
4157         struct sk_buff *skb;
4158         int brport_idx = 0;
4159         u8 ndm_flags = 0;
4160         int br_idx = 0;
4161         u8 *addr = NULL;
4162         u16 vid = 0;
4163         int err;
4164
4165         err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4166                                    &brport_idx, &addr, &vid, extack);
4167         if (err < 0)
4168                 return err;
4169
4170         if (!addr) {
4171                 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4172                 return -EINVAL;
4173         }
4174
4175         if (brport_idx) {
4176                 dev = __dev_get_by_index(net, brport_idx);
4177                 if (!dev) {
4178                         NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4179                         return -ENODEV;
4180                 }
4181         }
4182
4183         if (br_idx) {
4184                 if (dev) {
4185                         NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4186                         return -EINVAL;
4187                 }
4188
4189                 br_dev = __dev_get_by_index(net, br_idx);
4190                 if (!br_dev) {
4191                         NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4192                         return -EINVAL;
4193                 }
4194                 ops = br_dev->netdev_ops;
4195         }
4196
4197         if (dev) {
4198                 if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4199                         if (!(dev->priv_flags & IFF_BRIDGE_PORT)) {
4200                                 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4201                                 return -EINVAL;
4202                         }
4203                         br_dev = netdev_master_upper_dev_get(dev);
4204                         if (!br_dev) {
4205                                 NL_SET_ERR_MSG(extack, "Master of device not found");
4206                                 return -EINVAL;
4207                         }
4208                         ops = br_dev->netdev_ops;
4209                 } else {
4210                         if (!(ndm_flags & NTF_SELF)) {
4211                                 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4212                                 return -EINVAL;
4213                         }
4214                         ops = dev->netdev_ops;
4215                 }
4216         }
4217
4218         if (!br_dev && !dev) {
4219                 NL_SET_ERR_MSG(extack, "No device specified");
4220                 return -ENODEV;
4221         }
4222
4223         if (!ops || !ops->ndo_fdb_get) {
4224                 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4225                 return -EOPNOTSUPP;
4226         }
4227
4228         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4229         if (!skb)
4230                 return -ENOBUFS;
4231
4232         if (br_dev)
4233                 dev = br_dev;
4234         err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4235                                NETLINK_CB(in_skb).portid,
4236                                nlh->nlmsg_seq, extack);
4237         if (err)
4238                 goto out;
4239
4240         return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4241 out:
4242         kfree_skb(skb);
4243         return err;
4244 }
4245
4246 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4247                                unsigned int attrnum, unsigned int flag)
4248 {
4249         if (mask & flag)
4250                 return nla_put_u8(skb, attrnum, !!(flags & flag));
4251         return 0;
4252 }
4253
4254 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4255                             struct net_device *dev, u16 mode,
4256                             u32 flags, u32 mask, int nlflags,
4257                             u32 filter_mask,
4258                             int (*vlan_fill)(struct sk_buff *skb,
4259                                              struct net_device *dev,
4260                                              u32 filter_mask))
4261 {
4262         struct nlmsghdr *nlh;
4263         struct ifinfomsg *ifm;
4264         struct nlattr *br_afspec;
4265         struct nlattr *protinfo;
4266         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4267         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4268         int err = 0;
4269
4270         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4271         if (nlh == NULL)
4272                 return -EMSGSIZE;
4273
4274         ifm = nlmsg_data(nlh);
4275         ifm->ifi_family = AF_BRIDGE;
4276         ifm->__ifi_pad = 0;
4277         ifm->ifi_type = dev->type;
4278         ifm->ifi_index = dev->ifindex;
4279         ifm->ifi_flags = dev_get_flags(dev);
4280         ifm->ifi_change = 0;
4281
4282
4283         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4284             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4285             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4286             (br_dev &&
4287              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4288             (dev->addr_len &&
4289              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4290             (dev->ifindex != dev_get_iflink(dev) &&
4291              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4292                 goto nla_put_failure;
4293
4294         br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4295         if (!br_afspec)
4296                 goto nla_put_failure;
4297
4298         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4299                 nla_nest_cancel(skb, br_afspec);
4300                 goto nla_put_failure;
4301         }
4302
4303         if (mode != BRIDGE_MODE_UNDEF) {
4304                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4305                         nla_nest_cancel(skb, br_afspec);
4306                         goto nla_put_failure;
4307                 }
4308         }
4309         if (vlan_fill) {
4310                 err = vlan_fill(skb, dev, filter_mask);
4311                 if (err) {
4312                         nla_nest_cancel(skb, br_afspec);
4313                         goto nla_put_failure;
4314                 }
4315         }
4316         nla_nest_end(skb, br_afspec);
4317
4318         protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4319         if (!protinfo)
4320                 goto nla_put_failure;
4321
4322         if (brport_nla_put_flag(skb, flags, mask,
4323                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4324             brport_nla_put_flag(skb, flags, mask,
4325                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4326             brport_nla_put_flag(skb, flags, mask,
4327                                 IFLA_BRPORT_FAST_LEAVE,
4328                                 BR_MULTICAST_FAST_LEAVE) ||
4329             brport_nla_put_flag(skb, flags, mask,
4330                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4331             brport_nla_put_flag(skb, flags, mask,
4332                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4333             brport_nla_put_flag(skb, flags, mask,
4334                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4335             brport_nla_put_flag(skb, flags, mask,
4336                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4337             brport_nla_put_flag(skb, flags, mask,
4338                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
4339                 nla_nest_cancel(skb, protinfo);
4340                 goto nla_put_failure;
4341         }
4342
4343         nla_nest_end(skb, protinfo);
4344
4345         nlmsg_end(skb, nlh);
4346         return 0;
4347 nla_put_failure:
4348         nlmsg_cancel(skb, nlh);
4349         return err ? err : -EMSGSIZE;
4350 }
4351 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4352
4353 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4354                                     bool strict_check, u32 *filter_mask,
4355                                     struct netlink_ext_ack *extack)
4356 {
4357         struct nlattr *tb[IFLA_MAX+1];
4358         int err, i;
4359
4360         if (strict_check) {
4361                 struct ifinfomsg *ifm;
4362
4363                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4364                         NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4365                         return -EINVAL;
4366                 }
4367
4368                 ifm = nlmsg_data(nlh);
4369                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4370                     ifm->ifi_change || ifm->ifi_index) {
4371                         NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4372                         return -EINVAL;
4373                 }
4374
4375                 err = nlmsg_parse_deprecated_strict(nlh,
4376                                                     sizeof(struct ifinfomsg),
4377                                                     tb, IFLA_MAX, ifla_policy,
4378                                                     extack);
4379         } else {
4380                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4381                                              tb, IFLA_MAX, ifla_policy,
4382                                              extack);
4383         }
4384         if (err < 0)
4385                 return err;
4386
4387         /* new attributes should only be added with strict checking */
4388         for (i = 0; i <= IFLA_MAX; ++i) {
4389                 if (!tb[i])
4390                         continue;
4391
4392                 switch (i) {
4393                 case IFLA_EXT_MASK:
4394                         *filter_mask = nla_get_u32(tb[i]);
4395                         break;
4396                 default:
4397                         if (strict_check) {
4398                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4399                                 return -EINVAL;
4400                         }
4401                 }
4402         }
4403
4404         return 0;
4405 }
4406
4407 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4408 {
4409         const struct nlmsghdr *nlh = cb->nlh;
4410         struct net *net = sock_net(skb->sk);
4411         struct net_device *dev;
4412         int idx = 0;
4413         u32 portid = NETLINK_CB(cb->skb).portid;
4414         u32 seq = nlh->nlmsg_seq;
4415         u32 filter_mask = 0;
4416         int err;
4417
4418         err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4419                                        cb->extack);
4420         if (err < 0 && cb->strict_check)
4421                 return err;
4422
4423         rcu_read_lock();
4424         for_each_netdev_rcu(net, dev) {
4425                 const struct net_device_ops *ops = dev->netdev_ops;
4426                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4427
4428                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4429                         if (idx >= cb->args[0]) {
4430                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
4431                                                 skb, portid, seq, dev,
4432                                                 filter_mask, NLM_F_MULTI);
4433                                 if (err < 0 && err != -EOPNOTSUPP) {
4434                                         if (likely(skb->len))
4435                                                 break;
4436
4437                                         goto out_err;
4438                                 }
4439                         }
4440                         idx++;
4441                 }
4442
4443                 if (ops->ndo_bridge_getlink) {
4444                         if (idx >= cb->args[0]) {
4445                                 err = ops->ndo_bridge_getlink(skb, portid,
4446                                                               seq, dev,
4447                                                               filter_mask,
4448                                                               NLM_F_MULTI);
4449                                 if (err < 0 && err != -EOPNOTSUPP) {
4450                                         if (likely(skb->len))
4451                                                 break;
4452
4453                                         goto out_err;
4454                                 }
4455                         }
4456                         idx++;
4457                 }
4458         }
4459         err = skb->len;
4460 out_err:
4461         rcu_read_unlock();
4462         cb->args[0] = idx;
4463
4464         return err;
4465 }
4466
4467 static inline size_t bridge_nlmsg_size(void)
4468 {
4469         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4470                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
4471                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
4472                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
4473                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
4474                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
4475                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
4476                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
4477                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
4478                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
4479                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
4480 }
4481
4482 static int rtnl_bridge_notify(struct net_device *dev)
4483 {
4484         struct net *net = dev_net(dev);
4485         struct sk_buff *skb;
4486         int err = -EOPNOTSUPP;
4487
4488         if (!dev->netdev_ops->ndo_bridge_getlink)
4489                 return 0;
4490
4491         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4492         if (!skb) {
4493                 err = -ENOMEM;
4494                 goto errout;
4495         }
4496
4497         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4498         if (err < 0)
4499                 goto errout;
4500
4501         if (!skb->len)
4502                 goto errout;
4503
4504         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4505         return 0;
4506 errout:
4507         WARN_ON(err == -EMSGSIZE);
4508         kfree_skb(skb);
4509         if (err)
4510                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4511         return err;
4512 }
4513
4514 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4515                                struct netlink_ext_ack *extack)
4516 {
4517         struct net *net = sock_net(skb->sk);
4518         struct ifinfomsg *ifm;
4519         struct net_device *dev;
4520         struct nlattr *br_spec, *attr = NULL;
4521         int rem, err = -EOPNOTSUPP;
4522         u16 flags = 0;
4523         bool have_flags = false;
4524
4525         if (nlmsg_len(nlh) < sizeof(*ifm))
4526                 return -EINVAL;
4527
4528         ifm = nlmsg_data(nlh);
4529         if (ifm->ifi_family != AF_BRIDGE)
4530                 return -EPFNOSUPPORT;
4531
4532         dev = __dev_get_by_index(net, ifm->ifi_index);
4533         if (!dev) {
4534                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4535                 return -ENODEV;
4536         }
4537
4538         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4539         if (br_spec) {
4540                 nla_for_each_nested(attr, br_spec, rem) {
4541                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4542                                 if (nla_len(attr) < sizeof(flags))
4543                                         return -EINVAL;
4544
4545                                 have_flags = true;
4546                                 flags = nla_get_u16(attr);
4547                                 break;
4548                         }
4549                 }
4550         }
4551
4552         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4553                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4554
4555                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4556                         err = -EOPNOTSUPP;
4557                         goto out;
4558                 }
4559
4560                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
4561                                                              extack);
4562                 if (err)
4563                         goto out;
4564
4565                 flags &= ~BRIDGE_FLAGS_MASTER;
4566         }
4567
4568         if ((flags & BRIDGE_FLAGS_SELF)) {
4569                 if (!dev->netdev_ops->ndo_bridge_setlink)
4570                         err = -EOPNOTSUPP;
4571                 else
4572                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4573                                                                   flags,
4574                                                                   extack);
4575                 if (!err) {
4576                         flags &= ~BRIDGE_FLAGS_SELF;
4577
4578                         /* Generate event to notify upper layer of bridge
4579                          * change
4580                          */
4581                         err = rtnl_bridge_notify(dev);
4582                 }
4583         }
4584
4585         if (have_flags)
4586                 memcpy(nla_data(attr), &flags, sizeof(flags));
4587 out:
4588         return err;
4589 }
4590
4591 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4592                                struct netlink_ext_ack *extack)
4593 {
4594         struct net *net = sock_net(skb->sk);
4595         struct ifinfomsg *ifm;
4596         struct net_device *dev;
4597         struct nlattr *br_spec, *attr = NULL;
4598         int rem, err = -EOPNOTSUPP;
4599         u16 flags = 0;
4600         bool have_flags = false;
4601
4602         if (nlmsg_len(nlh) < sizeof(*ifm))
4603                 return -EINVAL;
4604
4605         ifm = nlmsg_data(nlh);
4606         if (ifm->ifi_family != AF_BRIDGE)
4607                 return -EPFNOSUPPORT;
4608
4609         dev = __dev_get_by_index(net, ifm->ifi_index);
4610         if (!dev) {
4611                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4612                 return -ENODEV;
4613         }
4614
4615         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4616         if (br_spec) {
4617                 nla_for_each_nested(attr, br_spec, rem) {
4618                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4619                                 if (nla_len(attr) < sizeof(flags))
4620                                         return -EINVAL;
4621
4622                                 have_flags = true;
4623                                 flags = nla_get_u16(attr);
4624                                 break;
4625                         }
4626                 }
4627         }
4628
4629         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4630                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4631
4632                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4633                         err = -EOPNOTSUPP;
4634                         goto out;
4635                 }
4636
4637                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4638                 if (err)
4639                         goto out;
4640
4641                 flags &= ~BRIDGE_FLAGS_MASTER;
4642         }
4643
4644         if ((flags & BRIDGE_FLAGS_SELF)) {
4645                 if (!dev->netdev_ops->ndo_bridge_dellink)
4646                         err = -EOPNOTSUPP;
4647                 else
4648                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
4649                                                                   flags);
4650
4651                 if (!err) {
4652                         flags &= ~BRIDGE_FLAGS_SELF;
4653
4654                         /* Generate event to notify upper layer of bridge
4655                          * change
4656                          */
4657                         err = rtnl_bridge_notify(dev);
4658                 }
4659         }
4660
4661         if (have_flags)
4662                 memcpy(nla_data(attr), &flags, sizeof(flags));
4663 out:
4664         return err;
4665 }
4666
4667 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
4668 {
4669         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
4670                (!idxattr || idxattr == attrid);
4671 }
4672
4673 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
4674 static int rtnl_get_offload_stats_attr_size(int attr_id)
4675 {
4676         switch (attr_id) {
4677         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
4678                 return sizeof(struct rtnl_link_stats64);
4679         }
4680
4681         return 0;
4682 }
4683
4684 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
4685                                   int *prividx)
4686 {
4687         struct nlattr *attr = NULL;
4688         int attr_id, size;
4689         void *attr_data;
4690         int err;
4691
4692         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4693               dev->netdev_ops->ndo_get_offload_stats))
4694                 return -ENODATA;
4695
4696         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4697              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4698                 if (attr_id < *prividx)
4699                         continue;
4700
4701                 size = rtnl_get_offload_stats_attr_size(attr_id);
4702                 if (!size)
4703                         continue;
4704
4705                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4706                         continue;
4707
4708                 attr = nla_reserve_64bit(skb, attr_id, size,
4709                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
4710                 if (!attr)
4711                         goto nla_put_failure;
4712
4713                 attr_data = nla_data(attr);
4714                 memset(attr_data, 0, size);
4715                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
4716                                                              attr_data);
4717                 if (err)
4718                         goto get_offload_stats_failure;
4719         }
4720
4721         if (!attr)
4722                 return -ENODATA;
4723
4724         *prividx = 0;
4725         return 0;
4726
4727 nla_put_failure:
4728         err = -EMSGSIZE;
4729 get_offload_stats_failure:
4730         *prividx = attr_id;
4731         return err;
4732 }
4733
4734 static int rtnl_get_offload_stats_size(const struct net_device *dev)
4735 {
4736         int nla_size = 0;
4737         int attr_id;
4738         int size;
4739
4740         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4741               dev->netdev_ops->ndo_get_offload_stats))
4742                 return 0;
4743
4744         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4745              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4746                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4747                         continue;
4748                 size = rtnl_get_offload_stats_attr_size(attr_id);
4749                 nla_size += nla_total_size_64bit(size);
4750         }
4751
4752         if (nla_size != 0)
4753                 nla_size += nla_total_size(0);
4754
4755         return nla_size;
4756 }
4757
4758 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
4759                                int type, u32 pid, u32 seq, u32 change,
4760                                unsigned int flags, unsigned int filter_mask,
4761                                int *idxattr, int *prividx)
4762 {
4763         struct if_stats_msg *ifsm;
4764         struct nlmsghdr *nlh;
4765         struct nlattr *attr;
4766         int s_prividx = *prividx;
4767         int err;
4768
4769         ASSERT_RTNL();
4770
4771         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
4772         if (!nlh)
4773                 return -EMSGSIZE;
4774
4775         ifsm = nlmsg_data(nlh);
4776         ifsm->family = PF_UNSPEC;
4777         ifsm->pad1 = 0;
4778         ifsm->pad2 = 0;
4779         ifsm->ifindex = dev->ifindex;
4780         ifsm->filter_mask = filter_mask;
4781
4782         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
4783                 struct rtnl_link_stats64 *sp;
4784
4785                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
4786                                          sizeof(struct rtnl_link_stats64),
4787                                          IFLA_STATS_UNSPEC);
4788                 if (!attr)
4789                         goto nla_put_failure;
4790
4791                 sp = nla_data(attr);
4792                 dev_get_stats(dev, sp);
4793         }
4794
4795         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
4796                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4797
4798                 if (ops && ops->fill_linkxstats) {
4799                         *idxattr = IFLA_STATS_LINK_XSTATS;
4800                         attr = nla_nest_start_noflag(skb,
4801                                                      IFLA_STATS_LINK_XSTATS);
4802                         if (!attr)
4803                                 goto nla_put_failure;
4804
4805                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4806                         nla_nest_end(skb, attr);
4807                         if (err)
4808                                 goto nla_put_failure;
4809                         *idxattr = 0;
4810                 }
4811         }
4812
4813         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
4814                              *idxattr)) {
4815                 const struct rtnl_link_ops *ops = NULL;
4816                 const struct net_device *master;
4817
4818                 master = netdev_master_upper_dev_get(dev);
4819                 if (master)
4820                         ops = master->rtnl_link_ops;
4821                 if (ops && ops->fill_linkxstats) {
4822                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
4823                         attr = nla_nest_start_noflag(skb,
4824                                                      IFLA_STATS_LINK_XSTATS_SLAVE);
4825                         if (!attr)
4826                                 goto nla_put_failure;
4827
4828                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4829                         nla_nest_end(skb, attr);
4830                         if (err)
4831                                 goto nla_put_failure;
4832                         *idxattr = 0;
4833                 }
4834         }
4835
4836         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
4837                              *idxattr)) {
4838                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
4839                 attr = nla_nest_start_noflag(skb,
4840                                              IFLA_STATS_LINK_OFFLOAD_XSTATS);
4841                 if (!attr)
4842                         goto nla_put_failure;
4843
4844                 err = rtnl_get_offload_stats(skb, dev, prividx);
4845                 if (err == -ENODATA)
4846                         nla_nest_cancel(skb, attr);
4847                 else
4848                         nla_nest_end(skb, attr);
4849
4850                 if (err && err != -ENODATA)
4851                         goto nla_put_failure;
4852                 *idxattr = 0;
4853         }
4854
4855         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
4856                 struct rtnl_af_ops *af_ops;
4857
4858                 *idxattr = IFLA_STATS_AF_SPEC;
4859                 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
4860                 if (!attr)
4861                         goto nla_put_failure;
4862
4863                 rcu_read_lock();
4864                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4865                         if (af_ops->fill_stats_af) {
4866                                 struct nlattr *af;
4867                                 int err;
4868
4869                                 af = nla_nest_start_noflag(skb,
4870                                                            af_ops->family);
4871                                 if (!af) {
4872                                         rcu_read_unlock();
4873                                         goto nla_put_failure;
4874                                 }
4875                                 err = af_ops->fill_stats_af(skb, dev);
4876
4877                                 if (err == -ENODATA) {
4878                                         nla_nest_cancel(skb, af);
4879                                 } else if (err < 0) {
4880                                         rcu_read_unlock();
4881                                         goto nla_put_failure;
4882                                 }
4883
4884                                 nla_nest_end(skb, af);
4885                         }
4886                 }
4887                 rcu_read_unlock();
4888
4889                 nla_nest_end(skb, attr);
4890
4891                 *idxattr = 0;
4892         }
4893
4894         nlmsg_end(skb, nlh);
4895
4896         return 0;
4897
4898 nla_put_failure:
4899         /* not a multi message or no progress mean a real error */
4900         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
4901                 nlmsg_cancel(skb, nlh);
4902         else
4903                 nlmsg_end(skb, nlh);
4904
4905         return -EMSGSIZE;
4906 }
4907
4908 static size_t if_nlmsg_stats_size(const struct net_device *dev,
4909                                   u32 filter_mask)
4910 {
4911         size_t size = 0;
4912
4913         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
4914                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
4915
4916         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
4917                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4918                 int attr = IFLA_STATS_LINK_XSTATS;
4919
4920                 if (ops && ops->get_linkxstats_size) {
4921                         size += nla_total_size(ops->get_linkxstats_size(dev,
4922                                                                         attr));
4923                         /* for IFLA_STATS_LINK_XSTATS */
4924                         size += nla_total_size(0);
4925                 }
4926         }
4927
4928         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
4929                 struct net_device *_dev = (struct net_device *)dev;
4930                 const struct rtnl_link_ops *ops = NULL;
4931                 const struct net_device *master;
4932
4933                 /* netdev_master_upper_dev_get can't take const */
4934                 master = netdev_master_upper_dev_get(_dev);
4935                 if (master)
4936                         ops = master->rtnl_link_ops;
4937                 if (ops && ops->get_linkxstats_size) {
4938                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
4939
4940                         size += nla_total_size(ops->get_linkxstats_size(dev,
4941                                                                         attr));
4942                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
4943                         size += nla_total_size(0);
4944                 }
4945         }
4946
4947         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
4948                 size += rtnl_get_offload_stats_size(dev);
4949
4950         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
4951                 struct rtnl_af_ops *af_ops;
4952
4953                 /* for IFLA_STATS_AF_SPEC */
4954                 size += nla_total_size(0);
4955
4956                 rcu_read_lock();
4957                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4958                         if (af_ops->get_stats_af_size) {
4959                                 size += nla_total_size(
4960                                         af_ops->get_stats_af_size(dev));
4961
4962                                 /* for AF_* */
4963                                 size += nla_total_size(0);
4964                         }
4965                 }
4966                 rcu_read_unlock();
4967         }
4968
4969         return size;
4970 }
4971
4972 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
4973                                 bool is_dump, struct netlink_ext_ack *extack)
4974 {
4975         struct if_stats_msg *ifsm;
4976
4977         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
4978                 NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
4979                 return -EINVAL;
4980         }
4981
4982         if (!strict_check)
4983                 return 0;
4984
4985         ifsm = nlmsg_data(nlh);
4986
4987         /* only requests using strict checks can pass data to influence
4988          * the dump. The legacy exception is filter_mask.
4989          */
4990         if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
4991                 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
4992                 return -EINVAL;
4993         }
4994         if (nlmsg_attrlen(nlh, sizeof(*ifsm))) {
4995                 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
4996                 return -EINVAL;
4997         }
4998         if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
4999                 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5000                 return -EINVAL;
5001         }
5002
5003         return 0;
5004 }
5005
5006 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5007                           struct netlink_ext_ack *extack)
5008 {
5009         struct net *net = sock_net(skb->sk);
5010         struct net_device *dev = NULL;
5011         int idxattr = 0, prividx = 0;
5012         struct if_stats_msg *ifsm;
5013         struct sk_buff *nskb;
5014         u32 filter_mask;
5015         int err;
5016
5017         err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5018                                    false, extack);
5019         if (err)
5020                 return err;
5021
5022         ifsm = nlmsg_data(nlh);
5023         if (ifsm->ifindex > 0)
5024                 dev = __dev_get_by_index(net, ifsm->ifindex);
5025         else
5026                 return -EINVAL;
5027
5028         if (!dev)
5029                 return -ENODEV;
5030
5031         filter_mask = ifsm->filter_mask;
5032         if (!filter_mask)
5033                 return -EINVAL;
5034
5035         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
5036         if (!nskb)
5037                 return -ENOBUFS;
5038
5039         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5040                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5041                                   0, filter_mask, &idxattr, &prividx);
5042         if (err < 0) {
5043                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5044                 WARN_ON(err == -EMSGSIZE);
5045                 kfree_skb(nskb);
5046         } else {
5047                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5048         }
5049
5050         return err;
5051 }
5052
5053 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5054 {
5055         struct netlink_ext_ack *extack = cb->extack;
5056         int h, s_h, err, s_idx, s_idxattr, s_prividx;
5057         struct net *net = sock_net(skb->sk);
5058         unsigned int flags = NLM_F_MULTI;
5059         struct if_stats_msg *ifsm;
5060         struct hlist_head *head;
5061         struct net_device *dev;
5062         u32 filter_mask = 0;
5063         int idx = 0;
5064
5065         s_h = cb->args[0];
5066         s_idx = cb->args[1];
5067         s_idxattr = cb->args[2];
5068         s_prividx = cb->args[3];
5069
5070         cb->seq = net->dev_base_seq;
5071
5072         err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5073         if (err)
5074                 return err;
5075
5076         ifsm = nlmsg_data(cb->nlh);
5077         filter_mask = ifsm->filter_mask;
5078         if (!filter_mask) {
5079                 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5080                 return -EINVAL;
5081         }
5082
5083         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5084                 idx = 0;
5085                 head = &net->dev_index_head[h];
5086                 hlist_for_each_entry(dev, head, index_hlist) {
5087                         if (idx < s_idx)
5088                                 goto cont;
5089                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5090                                                   NETLINK_CB(cb->skb).portid,
5091                                                   cb->nlh->nlmsg_seq, 0,
5092                                                   flags, filter_mask,
5093                                                   &s_idxattr, &s_prividx);
5094                         /* If we ran out of room on the first message,
5095                          * we're in trouble
5096                          */
5097                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5098
5099                         if (err < 0)
5100                                 goto out;
5101                         s_prividx = 0;
5102                         s_idxattr = 0;
5103                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5104 cont:
5105                         idx++;
5106                 }
5107         }
5108 out:
5109         cb->args[3] = s_prividx;
5110         cb->args[2] = s_idxattr;
5111         cb->args[1] = idx;
5112         cb->args[0] = h;
5113
5114         return skb->len;
5115 }
5116
5117 /* Process one rtnetlink message. */
5118
5119 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5120                              struct netlink_ext_ack *extack)
5121 {
5122         struct net *net = sock_net(skb->sk);
5123         struct rtnl_link *link;
5124         struct module *owner;
5125         int err = -EOPNOTSUPP;
5126         rtnl_doit_func doit;
5127         unsigned int flags;
5128         int kind;
5129         int family;
5130         int type;
5131
5132         type = nlh->nlmsg_type;
5133         if (type > RTM_MAX)
5134                 return -EOPNOTSUPP;
5135
5136         type -= RTM_BASE;
5137
5138         /* All the messages must have at least 1 byte length */
5139         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
5140                 return 0;
5141
5142         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
5143         kind = type&3;
5144
5145         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
5146                 return -EPERM;
5147
5148         rcu_read_lock();
5149         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
5150                 struct sock *rtnl;
5151                 rtnl_dumpit_func dumpit;
5152                 u16 min_dump_alloc = 0;
5153
5154                 link = rtnl_get_link(family, type);
5155                 if (!link || !link->dumpit) {
5156                         family = PF_UNSPEC;
5157                         link = rtnl_get_link(family, type);
5158                         if (!link || !link->dumpit)
5159                                 goto err_unlock;
5160                 }
5161                 owner = link->owner;
5162                 dumpit = link->dumpit;
5163
5164                 if (type == RTM_GETLINK - RTM_BASE)
5165                         min_dump_alloc = rtnl_calcit(skb, nlh);
5166
5167                 err = 0;
5168                 /* need to do this before rcu_read_unlock() */
5169                 if (!try_module_get(owner))
5170                         err = -EPROTONOSUPPORT;
5171
5172                 rcu_read_unlock();
5173
5174                 rtnl = net->rtnl;
5175                 if (err == 0) {
5176                         struct netlink_dump_control c = {
5177                                 .dump           = dumpit,
5178                                 .min_dump_alloc = min_dump_alloc,
5179                                 .module         = owner,
5180                         };
5181                         err = netlink_dump_start(rtnl, skb, nlh, &c);
5182                         /* netlink_dump_start() will keep a reference on
5183                          * module if dump is still in progress.
5184                          */
5185                         module_put(owner);
5186                 }
5187                 return err;
5188         }
5189
5190         link = rtnl_get_link(family, type);
5191         if (!link || !link->doit) {
5192                 family = PF_UNSPEC;
5193                 link = rtnl_get_link(PF_UNSPEC, type);
5194                 if (!link || !link->doit)
5195                         goto out_unlock;
5196         }
5197
5198         owner = link->owner;
5199         if (!try_module_get(owner)) {
5200                 err = -EPROTONOSUPPORT;
5201                 goto out_unlock;
5202         }
5203
5204         flags = link->flags;
5205         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
5206                 doit = link->doit;
5207                 rcu_read_unlock();
5208                 if (doit)
5209                         err = doit(skb, nlh, extack);
5210                 module_put(owner);
5211                 return err;
5212         }
5213         rcu_read_unlock();
5214
5215         rtnl_lock();
5216         link = rtnl_get_link(family, type);
5217         if (link && link->doit)
5218                 err = link->doit(skb, nlh, extack);
5219         rtnl_unlock();
5220
5221         module_put(owner);
5222
5223         return err;
5224
5225 out_unlock:
5226         rcu_read_unlock();
5227         return err;
5228
5229 err_unlock:
5230         rcu_read_unlock();
5231         return -EOPNOTSUPP;
5232 }
5233
5234 static void rtnetlink_rcv(struct sk_buff *skb)
5235 {
5236         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
5237 }
5238
5239 static int rtnetlink_bind(struct net *net, int group)
5240 {
5241         switch (group) {
5242         case RTNLGRP_IPV4_MROUTE_R:
5243         case RTNLGRP_IPV6_MROUTE_R:
5244                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5245                         return -EPERM;
5246                 break;
5247         }
5248         return 0;
5249 }
5250
5251 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
5252 {
5253         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5254
5255         switch (event) {
5256         case NETDEV_REBOOT:
5257         case NETDEV_CHANGEMTU:
5258         case NETDEV_CHANGEADDR:
5259         case NETDEV_CHANGENAME:
5260         case NETDEV_FEAT_CHANGE:
5261         case NETDEV_BONDING_FAILOVER:
5262         case NETDEV_POST_TYPE_CHANGE:
5263         case NETDEV_NOTIFY_PEERS:
5264         case NETDEV_CHANGEUPPER:
5265         case NETDEV_RESEND_IGMP:
5266         case NETDEV_CHANGEINFODATA:
5267         case NETDEV_CHANGELOWERSTATE:
5268         case NETDEV_CHANGE_TX_QUEUE_LEN:
5269                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
5270                                    GFP_KERNEL, NULL, 0);
5271                 break;
5272         default:
5273                 break;
5274         }
5275         return NOTIFY_DONE;
5276 }
5277
5278 static struct notifier_block rtnetlink_dev_notifier = {
5279         .notifier_call  = rtnetlink_event,
5280 };
5281
5282
5283 static int __net_init rtnetlink_net_init(struct net *net)
5284 {
5285         struct sock *sk;
5286         struct netlink_kernel_cfg cfg = {
5287                 .groups         = RTNLGRP_MAX,
5288                 .input          = rtnetlink_rcv,
5289                 .cb_mutex       = &rtnl_mutex,
5290                 .flags          = NL_CFG_F_NONROOT_RECV,
5291                 .bind           = rtnetlink_bind,
5292         };
5293
5294         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
5295         if (!sk)
5296                 return -ENOMEM;
5297         net->rtnl = sk;
5298         return 0;
5299 }
5300
5301 static void __net_exit rtnetlink_net_exit(struct net *net)
5302 {
5303         netlink_kernel_release(net->rtnl);
5304         net->rtnl = NULL;
5305 }
5306
5307 static struct pernet_operations rtnetlink_net_ops = {
5308         .init = rtnetlink_net_init,
5309         .exit = rtnetlink_net_exit,
5310 };
5311
5312 void __init rtnetlink_init(void)
5313 {
5314         if (register_pernet_subsys(&rtnetlink_net_ops))
5315                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
5316
5317         register_netdevice_notifier(&rtnetlink_dev_notifier);
5318
5319         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
5320                       rtnl_dump_ifinfo, 0);
5321         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
5322         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
5323         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
5324
5325         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
5326         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
5327         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
5328
5329         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
5330         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
5331         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
5332
5333         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
5334         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
5335         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
5336
5337         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
5338                       0);
5339 }