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