net/core/rtnetlink.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Routing netlink socket interface: protocol independent part.
   7  *
   8  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   9  *
  10  *              This program is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  *
  15  *      Fixes:
  16  *      Vitaly E. Lavrov                RTA_OK arithmetics was wrong.
  17  */
  18
  19 #include <linux/bitops.h>
  20 #include <linux/errno.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/kernel.h>
  25 #include <linux/timer.h>
  26 #include <linux/string.h>
  27 #include <linux/sockios.h>
  28 #include <linux/net.h>
  29 #include <linux/fcntl.h>
  30 #include <linux/mm.h>
  31 #include <linux/slab.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/capability.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/init.h>
  36 #include <linux/security.h>
  37 #include <linux/mutex.h>
  38 #include <linux/if_addr.h>
  39 #include <linux/if_bridge.h>
  40 #include <linux/if_vlan.h>
  41 #include <linux/pci.h>
  42 #include <linux/etherdevice.h>
  43 #include <linux/bpf.h>
  44
  45 #include <linux/uaccess.h>
  46
  47 #include <linux/inet.h>
  48 #include <linux/netdevice.h>
  49 #include <net/switchdev.h>
  50 #include <net/ip.h>
  51 #include <net/protocol.h>
  52 #include <net/arp.h>
  53 #include <net/route.h>
  54 #include <net/udp.h>
  55 #include <net/tcp.h>
  56 #include <net/sock.h>
  57 #include <net/pkt_sched.h>
  58 #include <net/fib_rules.h>
  59 #include <net/rtnetlink.h>
  60 #include <net/net_namespace.h>
  61
  62 struct rtnl_link {
  63         rtnl_doit_func          doit;
  64         rtnl_dumpit_func        dumpit;
  65         unsigned int            flags;
  66 };
  67
  68 static DEFINE_MUTEX(rtnl_mutex);
  69
  70 void rtnl_lock(void)
  71 {
  72         mutex_lock(&rtnl_mutex);
  73 }
  74 EXPORT_SYMBOL(rtnl_lock);
  75
  76 static struct sk_buff *defer_kfree_skb_list;
  77 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
  78 {
  79         if (head && tail) {
  80                 tail->next = defer_kfree_skb_list;
  81                 defer_kfree_skb_list = head;
  82         }
  83 }
  84 EXPORT_SYMBOL(rtnl_kfree_skbs);
  85
  86 void __rtnl_unlock(void)
  87 {
  88         struct sk_buff *head = defer_kfree_skb_list;
  89
  90         defer_kfree_skb_list = NULL;
  91
  92         mutex_unlock(&rtnl_mutex);
  93
  94         while (head) {
  95                 struct sk_buff *next = head->next;
  96
  97                 kfree_skb(head);
  98                 cond_resched();
  99                 head = next;
 100         }
 101 }
 102
 103 void rtnl_unlock(void)
 104 {
 105         /* This fellow will unlock it for us. */
 106         netdev_run_todo();
 107 }
 108 EXPORT_SYMBOL(rtnl_unlock);
 109
 110 int rtnl_trylock(void)
 111 {
 112         return mutex_trylock(&rtnl_mutex);
 113 }
 114 EXPORT_SYMBOL(rtnl_trylock);
 115
 116 int rtnl_is_locked(void)
 117 {
 118         return mutex_is_locked(&rtnl_mutex);
 119 }
 120 EXPORT_SYMBOL(rtnl_is_locked);
 121
 122 #ifdef CONFIG_PROVE_LOCKING
 123 bool lockdep_rtnl_is_held(void)
 124 {
 125         return lockdep_is_held(&rtnl_mutex);
 126 }
 127 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 128 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 129
 130 static struct rtnl_link __rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 131 static refcount_t rtnl_msg_handlers_ref[RTNL_FAMILY_MAX + 1];
 132
 133 static inline int rtm_msgindex(int msgtype)
 134 {
 135         int msgindex = msgtype - RTM_BASE;
 136
 137         /*
 138          * msgindex < 0 implies someone tried to register a netlink
 139          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 140          * the message type has not been added to linux/rtnetlink.h
 141          */
 142         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 143
 144         return msgindex;
 145 }
 146
 147 /**
 148  * __rtnl_register - Register a rtnetlink message type
 149  * @protocol: Protocol family or PF_UNSPEC
 150  * @msgtype: rtnetlink message type
 151  * @doit: Function pointer called for each request message
 152  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 153  * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
 154  *
 155  * Registers the specified function pointers (at least one of them has
 156  * to be non-NULL) to be called whenever a request message for the
 157  * specified protocol family and message type is received.
 158  *
 159  * The special protocol family PF_UNSPEC may be used to define fallback
 160  * function pointers for the case when no entry for the specific protocol
 161  * family exists.
 162  *
 163  * Returns 0 on success or a negative error code.
 164  */
 165 int __rtnl_register(int protocol, int msgtype,
 166                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 167                     unsigned int flags)
 168 {
 169         struct rtnl_link *tab;
 170         int msgindex;
 171
 172         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 173         msgindex = rtm_msgindex(msgtype);
 174
 175         tab = rcu_dereference_raw(rtnl_msg_handlers[protocol]);
 176         if (tab == NULL) {
 177                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
 178                 if (tab == NULL)
 179                         return -ENOBUFS;
 180
 181                 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
 182         }
 183
 184         if (doit)
 185                 tab[msgindex].doit = doit;
 186         if (dumpit)
 187                 tab[msgindex].dumpit = dumpit;
 188         tab[msgindex].flags |= flags;
 189
 190         return 0;
 191 }
 192 EXPORT_SYMBOL_GPL(__rtnl_register);
 193
 194 /**
 195  * rtnl_register - Register a rtnetlink message type
 196  *
 197  * Identical to __rtnl_register() but panics on failure. This is useful
 198  * as failure of this function is very unlikely, it can only happen due
 199  * to lack of memory when allocating the chain to store all message
 200  * handlers for a protocol. Meant for use in init functions where lack
 201  * of memory implies no sense in continuing.
 202  */
 203 void rtnl_register(int protocol, int msgtype,
 204                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 205                    unsigned int flags)
 206 {
 207         if (__rtnl_register(protocol, msgtype, doit, dumpit, flags) < 0)
 208                 panic("Unable to register rtnetlink message handler, "
 209                       "protocol = %d, message type = %d\n",
 210                       protocol, msgtype);
 211 }
 212 EXPORT_SYMBOL_GPL(rtnl_register);
 213
 214 /**
 215  * rtnl_unregister - Unregister a rtnetlink message type
 216  * @protocol: Protocol family or PF_UNSPEC
 217  * @msgtype: rtnetlink message type
 218  *
 219  * Returns 0 on success or a negative error code.
 220  */
 221 int rtnl_unregister(int protocol, int msgtype)
 222 {
 223         struct rtnl_link *handlers;
 224         int msgindex;
 225
 226         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 227         msgindex = rtm_msgindex(msgtype);
 228
 229         rtnl_lock();
 230         handlers = rtnl_dereference(rtnl_msg_handlers[protocol]);
 231         if (!handlers) {
 232                 rtnl_unlock();
 233                 return -ENOENT;
 234         }
 235
 236         handlers[msgindex].doit = NULL;
 237         handlers[msgindex].dumpit = NULL;
 238         handlers[msgindex].flags = 0;
 239         rtnl_unlock();
 240
 241         return 0;
 242 }
 243 EXPORT_SYMBOL_GPL(rtnl_unregister);
 244
 245 /**
 246  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 247  * @protocol : Protocol family or PF_UNSPEC
 248  *
 249  * Identical to calling rtnl_unregster() for all registered message types
 250  * of a certain protocol family.
 251  */
 252 void rtnl_unregister_all(int protocol)
 253 {
 254         struct rtnl_link *handlers;
 255
 256         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 257
 258         rtnl_lock();
 259         handlers = rtnl_dereference(rtnl_msg_handlers[protocol]);
 260         RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
 261         rtnl_unlock();
 262
 263         synchronize_net();
 264
 265         while (refcount_read(&rtnl_msg_handlers_ref[protocol]) > 1)
 266                 schedule();
 267         kfree(handlers);
 268 }
 269 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 270
 271 static LIST_HEAD(link_ops);
 272
 273 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 274 {
 275         const struct rtnl_link_ops *ops;
 276
 277         list_for_each_entry(ops, &link_ops, list) {
 278                 if (!strcmp(ops->kind, kind))
 279                         return ops;
 280         }
 281         return NULL;
 282 }
 283
 284 /**
 285  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 286  * @ops: struct rtnl_link_ops * to register
 287  *
 288  * The caller must hold the rtnl_mutex. This function should be used
 289  * by drivers that create devices during module initialization. It
 290  * must be called before registering the devices.
 291  *
 292  * Returns 0 on success or a negative error code.
 293  */
 294 int __rtnl_link_register(struct rtnl_link_ops *ops)
 295 {
 296         if (rtnl_link_ops_get(ops->kind))
 297                 return -EEXIST;
 298
 299         /* The check for setup is here because if ops
 300          * does not have that filled up, it is not possible
 301          * to use the ops for creating device. So do not
 302          * fill up dellink as well. That disables rtnl_dellink.
 303          */
 304         if (ops->setup && !ops->dellink)
 305                 ops->dellink = unregister_netdevice_queue;
 306
 307         list_add_tail(&ops->list, &link_ops);
 308         return 0;
 309 }
 310 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 311
 312 /**
 313  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 314  * @ops: struct rtnl_link_ops * to register
 315  *
 316  * Returns 0 on success or a negative error code.
 317  */
 318 int rtnl_link_register(struct rtnl_link_ops *ops)
 319 {
 320         int err;
 321
 322         rtnl_lock();
 323         err = __rtnl_link_register(ops);
 324         rtnl_unlock();
 325         return err;
 326 }
 327 EXPORT_SYMBOL_GPL(rtnl_link_register);
 328
 329 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 330 {
 331         struct net_device *dev;
 332         LIST_HEAD(list_kill);
 333
 334         for_each_netdev(net, dev) {
 335                 if (dev->rtnl_link_ops == ops)
 336                         ops->dellink(dev, &list_kill);
 337         }
 338         unregister_netdevice_many(&list_kill);
 339 }
 340
 341 /**
 342  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 343  * @ops: struct rtnl_link_ops * to unregister
 344  *
 345  * The caller must hold the rtnl_mutex.
 346  */
 347 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 348 {
 349         struct net *net;
 350
 351         for_each_net(net) {
 352                 __rtnl_kill_links(net, ops);
 353         }
 354         list_del(&ops->list);
 355 }
 356 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 357
 358 /* Return with the rtnl_lock held when there are no network
 359  * devices unregistering in any network namespace.
 360  */
 361 static void rtnl_lock_unregistering_all(void)
 362 {
 363         struct net *net;
 364         bool unregistering;
 365         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 366
 367         add_wait_queue(&netdev_unregistering_wq, &wait);
 368         for (;;) {
 369                 unregistering = false;
 370                 rtnl_lock();
 371                 for_each_net(net) {
 372                         if (net->dev_unreg_count > 0) {
 373                                 unregistering = true;
 374                                 break;
 375                         }
 376                 }
 377                 if (!unregistering)
 378                         break;
 379                 __rtnl_unlock();
 380
 381                 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 382         }
 383         remove_wait_queue(&netdev_unregistering_wq, &wait);
 384 }
 385
 386 /**
 387  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 388  * @ops: struct rtnl_link_ops * to unregister
 389  */
 390 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 391 {
 392         /* Close the race with cleanup_net() */
 393         mutex_lock(&net_mutex);
 394         rtnl_lock_unregistering_all();
 395         __rtnl_link_unregister(ops);
 396         rtnl_unlock();
 397         mutex_unlock(&net_mutex);
 398 }
 399 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 400
 401 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 402 {
 403         struct net_device *master_dev;
 404         const struct rtnl_link_ops *ops;
 405         size_t size = 0;
 406
 407         rcu_read_lock();
 408
 409         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 410         if (!master_dev)
 411                 goto out;
 412
 413         ops = master_dev->rtnl_link_ops;
 414         if (!ops || !ops->get_slave_size)
 415                 goto out;
 416         /* IFLA_INFO_SLAVE_DATA + nested data */
 417         size = nla_total_size(sizeof(struct nlattr)) +
 418                ops->get_slave_size(master_dev, dev);
 419
 420 out:
 421         rcu_read_unlock();
 422         return size;
 423 }
 424
 425 static size_t rtnl_link_get_size(const struct net_device *dev)
 426 {
 427         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 428         size_t size;
 429
 430         if (!ops)
 431                 return 0;
 432
 433         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 434                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 435
 436         if (ops->get_size)
 437                 /* IFLA_INFO_DATA + nested data */
 438                 size += nla_total_size(sizeof(struct nlattr)) +
 439                         ops->get_size(dev);
 440
 441         if (ops->get_xstats_size)
 442                 /* IFLA_INFO_XSTATS */
 443                 size += nla_total_size(ops->get_xstats_size(dev));
 444
 445         size += rtnl_link_get_slave_info_data_size(dev);
 446
 447         return size;
 448 }
 449
 450 static LIST_HEAD(rtnl_af_ops);
 451
 452 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 453 {
 454         const struct rtnl_af_ops *ops;
 455
 456         list_for_each_entry(ops, &rtnl_af_ops, list) {
 457                 if (ops->family == family)
 458                         return ops;
 459         }
 460
 461         return NULL;
 462 }
 463
 464 /**
 465  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 466  * @ops: struct rtnl_af_ops * to register
 467  *
 468  * Returns 0 on success or a negative error code.
 469  */
 470 void rtnl_af_register(struct rtnl_af_ops *ops)
 471 {
 472         rtnl_lock();
 473         list_add_tail(&ops->list, &rtnl_af_ops);
 474         rtnl_unlock();
 475 }
 476 EXPORT_SYMBOL_GPL(rtnl_af_register);
 477
 478 /**
 479  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 480  * @ops: struct rtnl_af_ops * to unregister
 481  *
 482  * The caller must hold the rtnl_mutex.
 483  */
 484 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 485 {
 486         list_del(&ops->list);
 487 }
 488 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 489
 490 /**
 491  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 492  * @ops: struct rtnl_af_ops * to unregister
 493  */
 494 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 495 {
 496         rtnl_lock();
 497         __rtnl_af_unregister(ops);
 498         rtnl_unlock();
 499 }
 500 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 501
 502 static size_t rtnl_link_get_af_size(const struct net_device *dev,
 503                                     u32 ext_filter_mask)
 504 {
 505         struct rtnl_af_ops *af_ops;
 506         size_t size;
 507
 508         /* IFLA_AF_SPEC */
 509         size = nla_total_size(sizeof(struct nlattr));
 510
 511         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 512                 if (af_ops->get_link_af_size) {
 513                         /* AF_* + nested data */
 514                         size += nla_total_size(sizeof(struct nlattr)) +
 515                                 af_ops->get_link_af_size(dev, ext_filter_mask);
 516                 }
 517         }
 518
 519         return size;
 520 }
 521
 522 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 523 {
 524         struct net_device *master_dev;
 525
 526         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 527         if (master_dev && master_dev->rtnl_link_ops)
 528                 return true;
 529         return false;
 530 }
 531
 532 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 533                                      const struct net_device *dev)
 534 {
 535         struct net_device *master_dev;
 536         const struct rtnl_link_ops *ops;
 537         struct nlattr *slave_data;
 538         int err;
 539
 540         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 541         if (!master_dev)
 542                 return 0;
 543         ops = master_dev->rtnl_link_ops;
 544         if (!ops)
 545                 return 0;
 546         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 547                 return -EMSGSIZE;
 548         if (ops->fill_slave_info) {
 549                 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
 550                 if (!slave_data)
 551                         return -EMSGSIZE;
 552                 err = ops->fill_slave_info(skb, master_dev, dev);
 553                 if (err < 0)
 554                         goto err_cancel_slave_data;
 555                 nla_nest_end(skb, slave_data);
 556         }
 557         return 0;
 558
 559 err_cancel_slave_data:
 560         nla_nest_cancel(skb, slave_data);
 561         return err;
 562 }
 563
 564 static int rtnl_link_info_fill(struct sk_buff *skb,
 565                                const struct net_device *dev)
 566 {
 567         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 568         struct nlattr *data;
 569         int err;
 570
 571         if (!ops)
 572                 return 0;
 573         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 574                 return -EMSGSIZE;
 575         if (ops->fill_xstats) {
 576                 err = ops->fill_xstats(skb, dev);
 577                 if (err < 0)
 578                         return err;
 579         }
 580         if (ops->fill_info) {
 581                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 582                 if (data == NULL)
 583                         return -EMSGSIZE;
 584                 err = ops->fill_info(skb, dev);
 585                 if (err < 0)
 586                         goto err_cancel_data;
 587                 nla_nest_end(skb, data);
 588         }
 589         return 0;
 590
 591 err_cancel_data:
 592         nla_nest_cancel(skb, data);
 593         return err;
 594 }
 595
 596 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 597 {
 598         struct nlattr *linkinfo;
 599         int err = -EMSGSIZE;
 600
 601         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 602         if (linkinfo == NULL)
 603                 goto out;
 604
 605         err = rtnl_link_info_fill(skb, dev);
 606         if (err < 0)
 607                 goto err_cancel_link;
 608
 609         err = rtnl_link_slave_info_fill(skb, dev);
 610         if (err < 0)
 611                 goto err_cancel_link;
 612
 613         nla_nest_end(skb, linkinfo);
 614         return 0;
 615
 616 err_cancel_link:
 617         nla_nest_cancel(skb, linkinfo);
 618 out:
 619         return err;
 620 }
 621
 622 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 623 {
 624         struct sock *rtnl = net->rtnl;
 625         int err = 0;
 626
 627         NETLINK_CB(skb).dst_group = group;
 628         if (echo)
 629                 refcount_inc(&skb->users);
 630         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 631         if (echo)
 632                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 633         return err;
 634 }
 635
 636 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 637 {
 638         struct sock *rtnl = net->rtnl;
 639
 640         return nlmsg_unicast(rtnl, skb, pid);
 641 }
 642 EXPORT_SYMBOL(rtnl_unicast);
 643
 644 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 645                  struct nlmsghdr *nlh, gfp_t flags)
 646 {
 647         struct sock *rtnl = net->rtnl;
 648         int report = 0;
 649
 650         if (nlh)
 651                 report = nlmsg_report(nlh);
 652
 653         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 654 }
 655 EXPORT_SYMBOL(rtnl_notify);
 656
 657 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 658 {
 659         struct sock *rtnl = net->rtnl;
 660
 661         netlink_set_err(rtnl, 0, group, error);
 662 }
 663 EXPORT_SYMBOL(rtnl_set_sk_err);
 664
 665 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 666 {
 667         struct nlattr *mx;
 668         int i, valid = 0;
 669
 670         mx = nla_nest_start(skb, RTA_METRICS);
 671         if (mx == NULL)
 672                 return -ENOBUFS;
 673
 674         for (i = 0; i < RTAX_MAX; i++) {
 675                 if (metrics[i]) {
 676                         if (i == RTAX_CC_ALGO - 1) {
 677                                 char tmp[TCP_CA_NAME_MAX], *name;
 678
 679                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 680                                 if (!name)
 681                                         continue;
 682                                 if (nla_put_string(skb, i + 1, name))
 683                                         goto nla_put_failure;
 684                         } else if (i == RTAX_FEATURES - 1) {
 685                                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 686
 687                                 if (!user_features)
 688                                         continue;
 689                                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 690                                 if (nla_put_u32(skb, i + 1, user_features))
 691                                         goto nla_put_failure;
 692                         } else {
 693                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 694                                         goto nla_put_failure;
 695                         }
 696                         valid++;
 697                 }
 698         }
 699
 700         if (!valid) {
 701                 nla_nest_cancel(skb, mx);
 702                 return 0;
 703         }
 704
 705         return nla_nest_end(skb, mx);
 706
 707 nla_put_failure:
 708         nla_nest_cancel(skb, mx);
 709         return -EMSGSIZE;
 710 }
 711 EXPORT_SYMBOL(rtnetlink_put_metrics);
 712
 713 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 714                        long expires, u32 error)
 715 {
 716         struct rta_cacheinfo ci = {
 717                 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
 718                 .rta_used = dst->__use,
 719                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 720                 .rta_error = error,
 721                 .rta_id =  id,
 722         };
 723
 724         if (expires) {
 725                 unsigned long clock;
 726
 727                 clock = jiffies_to_clock_t(abs(expires));
 728                 clock = min_t(unsigned long, clock, INT_MAX);
 729                 ci.rta_expires = (expires > 0) ? clock : -clock;
 730         }
 731         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 732 }
 733 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 734
 735 static void set_operstate(struct net_device *dev, unsigned char transition)
 736 {
 737         unsigned char operstate = dev->operstate;
 738
 739         switch (transition) {
 740         case IF_OPER_UP:
 741                 if ((operstate == IF_OPER_DORMANT ||
 742                      operstate == IF_OPER_UNKNOWN) &&
 743                     !netif_dormant(dev))
 744                         operstate = IF_OPER_UP;
 745                 break;
 746
 747         case IF_OPER_DORMANT:
 748                 if (operstate == IF_OPER_UP ||
 749                     operstate == IF_OPER_UNKNOWN)
 750                         operstate = IF_OPER_DORMANT;
 751                 break;
 752         }
 753
 754         if (dev->operstate != operstate) {
 755                 write_lock_bh(&dev_base_lock);
 756                 dev->operstate = operstate;
 757                 write_unlock_bh(&dev_base_lock);
 758                 netdev_state_change(dev);
 759         }
 760 }
 761
 762 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 763 {
 764         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 765                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 766 }
 767
 768 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 769                                            const struct ifinfomsg *ifm)
 770 {
 771         unsigned int flags = ifm->ifi_flags;
 772
 773         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 774         if (ifm->ifi_change)
 775                 flags = (flags & ifm->ifi_change) |
 776                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 777
 778         return flags;
 779 }
 780
 781 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 782                                  const struct rtnl_link_stats64 *b)
 783 {
 784         a->rx_packets = b->rx_packets;
 785         a->tx_packets = b->tx_packets;
 786         a->rx_bytes = b->rx_bytes;
 787         a->tx_bytes = b->tx_bytes;
 788         a->rx_errors = b->rx_errors;
 789         a->tx_errors = b->tx_errors;
 790         a->rx_dropped = b->rx_dropped;
 791         a->tx_dropped = b->tx_dropped;
 792
 793         a->multicast = b->multicast;
 794         a->collisions = b->collisions;
 795
 796         a->rx_length_errors = b->rx_length_errors;
 797         a->rx_over_errors = b->rx_over_errors;
 798         a->rx_crc_errors = b->rx_crc_errors;
 799         a->rx_frame_errors = b->rx_frame_errors;
 800         a->rx_fifo_errors = b->rx_fifo_errors;
 801         a->rx_missed_errors = b->rx_missed_errors;
 802
 803         a->tx_aborted_errors = b->tx_aborted_errors;
 804         a->tx_carrier_errors = b->tx_carrier_errors;
 805         a->tx_fifo_errors = b->tx_fifo_errors;
 806         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 807         a->tx_window_errors = b->tx_window_errors;
 808
 809         a->rx_compressed = b->rx_compressed;
 810         a->tx_compressed = b->tx_compressed;
 811
 812         a->rx_nohandler = b->rx_nohandler;
 813 }
 814
 815 /* All VF info */
 816 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 817                                    u32 ext_filter_mask)
 818 {
 819         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
 820                 int num_vfs = dev_num_vf(dev->dev.parent);
 821                 size_t size = nla_total_size(0);
 822                 size += num_vfs *
 823                         (nla_total_size(0) +
 824                          nla_total_size(sizeof(struct ifla_vf_mac)) +
 825                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 826                          nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
 827                          nla_total_size(MAX_VLAN_LIST_LEN *
 828                                         sizeof(struct ifla_vf_vlan_info)) +
 829                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 830                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 831                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 832                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 833                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 834                          nla_total_size(0) + /* nest IFLA_VF_STATS */
 835                          /* IFLA_VF_STATS_RX_PACKETS */
 836                          nla_total_size_64bit(sizeof(__u64)) +
 837                          /* IFLA_VF_STATS_TX_PACKETS */
 838                          nla_total_size_64bit(sizeof(__u64)) +
 839                          /* IFLA_VF_STATS_RX_BYTES */
 840                          nla_total_size_64bit(sizeof(__u64)) +
 841                          /* IFLA_VF_STATS_TX_BYTES */
 842                          nla_total_size_64bit(sizeof(__u64)) +
 843                          /* IFLA_VF_STATS_BROADCAST */
 844                          nla_total_size_64bit(sizeof(__u64)) +
 845                          /* IFLA_VF_STATS_MULTICAST */
 846                          nla_total_size_64bit(sizeof(__u64)) +
 847                          nla_total_size(sizeof(struct ifla_vf_trust)));
 848                 return size;
 849         } else
 850                 return 0;
 851 }
 852
 853 static size_t rtnl_port_size(const struct net_device *dev,
 854                              u32 ext_filter_mask)
 855 {
 856         size_t port_size = nla_total_size(4)            /* PORT_VF */
 857                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 858                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 859                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 860                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 861                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 862         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 863         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 864                 + port_size;
 865         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 866                 + port_size;
 867
 868         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 869             !(ext_filter_mask & RTEXT_FILTER_VF))
 870                 return 0;
 871         if (dev_num_vf(dev->dev.parent))
 872                 return port_self_size + vf_ports_size +
 873                         vf_port_size * dev_num_vf(dev->dev.parent);
 874         else
 875                 return port_self_size;
 876 }
 877
 878 static size_t rtnl_xdp_size(void)
 879 {
 880         size_t xdp_size = nla_total_size(0) +   /* nest IFLA_XDP */
 881                           nla_total_size(1) +   /* XDP_ATTACHED */
 882                           nla_total_size(4);    /* XDP_PROG_ID */
 883
 884         return xdp_size;
 885 }
 886
 887 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 888                                      u32 ext_filter_mask)
 889 {
 890         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 891                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 892                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 893                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 894                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
 895                + nla_total_size(sizeof(struct rtnl_link_stats))
 896                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
 897                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 898                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 899                + nla_total_size(4) /* IFLA_TXQLEN */
 900                + nla_total_size(4) /* IFLA_WEIGHT */
 901                + nla_total_size(4) /* IFLA_MTU */
 902                + nla_total_size(4) /* IFLA_LINK */
 903                + nla_total_size(4) /* IFLA_MASTER */
 904                + nla_total_size(1) /* IFLA_CARRIER */
 905                + nla_total_size(4) /* IFLA_PROMISCUITY */
 906                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
 907                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 908                + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
 909                + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
 910                + nla_total_size(1) /* IFLA_OPERSTATE */
 911                + nla_total_size(1) /* IFLA_LINKMODE */
 912                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
 913                + nla_total_size(4) /* IFLA_LINK_NETNSID */
 914                + nla_total_size(4) /* IFLA_GROUP */
 915                + nla_total_size(ext_filter_mask
 916                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 917                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 918                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 919                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 920                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
 921                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
 922                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
 923                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
 924                + rtnl_xdp_size() /* IFLA_XDP */
 925                + nla_total_size(4)  /* IFLA_EVENT */
 926                + nla_total_size(1); /* IFLA_PROTO_DOWN */
 927
 928 }
 929
 930 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 931 {
 932         struct nlattr *vf_ports;
 933         struct nlattr *vf_port;
 934         int vf;
 935         int err;
 936
 937         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 938         if (!vf_ports)
 939                 return -EMSGSIZE;
 940
 941         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 942                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 943                 if (!vf_port)
 944                         goto nla_put_failure;
 945                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
 946                         goto nla_put_failure;
 947                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 948                 if (err == -EMSGSIZE)
 949                         goto nla_put_failure;
 950                 if (err) {
 951                         nla_nest_cancel(skb, vf_port);
 952                         continue;
 953                 }
 954                 nla_nest_end(skb, vf_port);
 955         }
 956
 957         nla_nest_end(skb, vf_ports);
 958
 959         return 0;
 960
 961 nla_put_failure:
 962         nla_nest_cancel(skb, vf_ports);
 963         return -EMSGSIZE;
 964 }
 965
 966 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 967 {
 968         struct nlattr *port_self;
 969         int err;
 970
 971         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 972         if (!port_self)
 973                 return -EMSGSIZE;
 974
 975         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 976         if (err) {
 977                 nla_nest_cancel(skb, port_self);
 978                 return (err == -EMSGSIZE) ? err : 0;
 979         }
 980
 981         nla_nest_end(skb, port_self);
 982
 983         return 0;
 984 }
 985
 986 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
 987                           u32 ext_filter_mask)
 988 {
 989         int err;
 990
 991         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 992             !(ext_filter_mask & RTEXT_FILTER_VF))
 993                 return 0;
 994
 995         err = rtnl_port_self_fill(skb, dev);
 996         if (err)
 997                 return err;
 998
 999         if (dev_num_vf(dev->dev.parent)) {
1000                 err = rtnl_vf_ports_fill(skb, dev);
1001                 if (err)
1002                         return err;
1003         }
1004
1005         return 0;
1006 }
1007
1008 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1009 {
1010         int err;
1011         struct netdev_phys_item_id ppid;
1012
1013         err = dev_get_phys_port_id(dev, &ppid);
1014         if (err) {
1015                 if (err == -EOPNOTSUPP)
1016                         return 0;
1017                 return err;
1018         }
1019
1020         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1021                 return -EMSGSIZE;
1022
1023         return 0;
1024 }
1025
1026 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1027 {
1028         char name[IFNAMSIZ];
1029         int err;
1030
1031         err = dev_get_phys_port_name(dev, name, sizeof(name));
1032         if (err) {
1033                 if (err == -EOPNOTSUPP)
1034                         return 0;
1035                 return err;
1036         }
1037
1038         if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1039                 return -EMSGSIZE;
1040
1041         return 0;
1042 }
1043
1044 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1045 {
1046         int err;
1047         struct switchdev_attr attr = {
1048                 .orig_dev = dev,
1049                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1050                 .flags = SWITCHDEV_F_NO_RECURSE,
1051         };
1052
1053         err = switchdev_port_attr_get(dev, &attr);
1054         if (err) {
1055                 if (err == -EOPNOTSUPP)
1056                         return 0;
1057                 return err;
1058         }
1059
1060         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1061                     attr.u.ppid.id))
1062                 return -EMSGSIZE;
1063
1064         return 0;
1065 }
1066
1067 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1068                                               struct net_device *dev)
1069 {
1070         struct rtnl_link_stats64 *sp;
1071         struct nlattr *attr;
1072
1073         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1074                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1075         if (!attr)
1076                 return -EMSGSIZE;
1077
1078         sp = nla_data(attr);
1079         dev_get_stats(dev, sp);
1080
1081         attr = nla_reserve(skb, IFLA_STATS,
1082                            sizeof(struct rtnl_link_stats));
1083         if (!attr)
1084                 return -EMSGSIZE;
1085
1086         copy_rtnl_link_stats(nla_data(attr), sp);
1087
1088         return 0;
1089 }
1090
1091 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1092                                                struct net_device *dev,
1093                                                int vfs_num,
1094                                                struct nlattr *vfinfo)
1095 {
1096         struct ifla_vf_rss_query_en vf_rss_query_en;
1097         struct nlattr *vf, *vfstats, *vfvlanlist;
1098         struct ifla_vf_link_state vf_linkstate;
1099         struct ifla_vf_vlan_info vf_vlan_info;
1100         struct ifla_vf_spoofchk vf_spoofchk;
1101         struct ifla_vf_tx_rate vf_tx_rate;
1102         struct ifla_vf_stats vf_stats;
1103         struct ifla_vf_trust vf_trust;
1104         struct ifla_vf_vlan vf_vlan;
1105         struct ifla_vf_rate vf_rate;
1106         struct ifla_vf_mac vf_mac;
1107         struct ifla_vf_info ivi;
1108
1109         memset(&ivi, 0, sizeof(ivi));
1110
1111         /* Not all SR-IOV capable drivers support the
1112          * spoofcheck and "RSS query enable" query.  Preset to
1113          * -1 so the user space tool can detect that the driver
1114          * didn't report anything.
1115          */
1116         ivi.spoofchk = -1;
1117         ivi.rss_query_en = -1;
1118         ivi.trusted = -1;
1119         /* The default value for VF link state is "auto"
1120          * IFLA_VF_LINK_STATE_AUTO which equals zero
1121          */
1122         ivi.linkstate = 0;
1123         /* VLAN Protocol by default is 802.1Q */
1124         ivi.vlan_proto = htons(ETH_P_8021Q);
1125         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1126                 return 0;
1127
1128         memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1129
1130         vf_mac.vf =
1131                 vf_vlan.vf =
1132                 vf_vlan_info.vf =
1133                 vf_rate.vf =
1134                 vf_tx_rate.vf =
1135                 vf_spoofchk.vf =
1136                 vf_linkstate.vf =
1137                 vf_rss_query_en.vf =
1138                 vf_trust.vf = ivi.vf;
1139
1140         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1141         vf_vlan.vlan = ivi.vlan;
1142         vf_vlan.qos = ivi.qos;
1143         vf_vlan_info.vlan = ivi.vlan;
1144         vf_vlan_info.qos = ivi.qos;
1145         vf_vlan_info.vlan_proto = ivi.vlan_proto;
1146         vf_tx_rate.rate = ivi.max_tx_rate;
1147         vf_rate.min_tx_rate = ivi.min_tx_rate;
1148         vf_rate.max_tx_rate = ivi.max_tx_rate;
1149         vf_spoofchk.setting = ivi.spoofchk;
1150         vf_linkstate.link_state = ivi.linkstate;
1151         vf_rss_query_en.setting = ivi.rss_query_en;
1152         vf_trust.setting = ivi.trusted;
1153         vf = nla_nest_start(skb, IFLA_VF_INFO);
1154         if (!vf)
1155                 goto nla_put_vfinfo_failure;
1156         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1157             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1158             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1159                     &vf_rate) ||
1160             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1161                     &vf_tx_rate) ||
1162             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1163                     &vf_spoofchk) ||
1164             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1165                     &vf_linkstate) ||
1166             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1167                     sizeof(vf_rss_query_en),
1168                     &vf_rss_query_en) ||
1169             nla_put(skb, IFLA_VF_TRUST,
1170                     sizeof(vf_trust), &vf_trust))
1171                 goto nla_put_vf_failure;
1172         vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST);
1173         if (!vfvlanlist)
1174                 goto nla_put_vf_failure;
1175         if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1176                     &vf_vlan_info)) {
1177                 nla_nest_cancel(skb, vfvlanlist);
1178                 goto nla_put_vf_failure;
1179         }
1180         nla_nest_end(skb, vfvlanlist);
1181         memset(&vf_stats, 0, sizeof(vf_stats));
1182         if (dev->netdev_ops->ndo_get_vf_stats)
1183                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1184                                                 &vf_stats);
1185         vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1186         if (!vfstats)
1187                 goto nla_put_vf_failure;
1188         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1189                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1190             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1191                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1192             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1193                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1194             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1195                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1196             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1197                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1198             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1199                               vf_stats.multicast, IFLA_VF_STATS_PAD)) {
1200                 nla_nest_cancel(skb, vfstats);
1201                 goto nla_put_vf_failure;
1202         }
1203         nla_nest_end(skb, vfstats);
1204         nla_nest_end(skb, vf);
1205         return 0;
1206
1207 nla_put_vf_failure:
1208         nla_nest_cancel(skb, vf);
1209 nla_put_vfinfo_failure:
1210         nla_nest_cancel(skb, vfinfo);
1211         return -EMSGSIZE;
1212 }
1213
1214 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1215 {
1216         struct rtnl_link_ifmap map;
1217
1218         memset(&map, 0, sizeof(map));
1219         map.mem_start   = dev->mem_start;
1220         map.mem_end     = dev->mem_end;
1221         map.base_addr   = dev->base_addr;
1222         map.irq         = dev->irq;
1223         map.dma         = dev->dma;
1224         map.port        = dev->if_port;
1225
1226         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1227                 return -EMSGSIZE;
1228
1229         return 0;
1230 }
1231
1232 static u8 rtnl_xdp_attached_mode(struct net_device *dev, u32 *prog_id)
1233 {
1234         const struct net_device_ops *ops = dev->netdev_ops;
1235         const struct bpf_prog *generic_xdp_prog;
1236
1237         ASSERT_RTNL();
1238
1239         *prog_id = 0;
1240         generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1241         if (generic_xdp_prog) {
1242                 *prog_id = generic_xdp_prog->aux->id;
1243                 return XDP_ATTACHED_SKB;
1244         }
1245         if (!ops->ndo_xdp)
1246                 return XDP_ATTACHED_NONE;
1247
1248         return __dev_xdp_attached(dev, ops->ndo_xdp, prog_id);
1249 }
1250
1251 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1252 {
1253         struct nlattr *xdp;
1254         u32 prog_id;
1255         int err;
1256
1257         xdp = nla_nest_start(skb, IFLA_XDP);
1258         if (!xdp)
1259                 return -EMSGSIZE;
1260
1261         err = nla_put_u8(skb, IFLA_XDP_ATTACHED,
1262                          rtnl_xdp_attached_mode(dev, &prog_id));
1263         if (err)
1264                 goto err_cancel;
1265
1266         if (prog_id) {
1267                 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1268                 if (err)
1269                         goto err_cancel;
1270         }
1271
1272         nla_nest_end(skb, xdp);
1273         return 0;
1274
1275 err_cancel:
1276         nla_nest_cancel(skb, xdp);
1277         return err;
1278 }
1279
1280 static u32 rtnl_get_event(unsigned long event)
1281 {
1282         u32 rtnl_event_type = IFLA_EVENT_NONE;
1283
1284         switch (event) {
1285         case NETDEV_REBOOT:
1286                 rtnl_event_type = IFLA_EVENT_REBOOT;
1287                 break;
1288         case NETDEV_FEAT_CHANGE:
1289                 rtnl_event_type = IFLA_EVENT_FEATURES;
1290                 break;
1291         case NETDEV_BONDING_FAILOVER:
1292                 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1293                 break;
1294         case NETDEV_NOTIFY_PEERS:
1295                 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1296                 break;
1297         case NETDEV_RESEND_IGMP:
1298                 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1299                 break;
1300         case NETDEV_CHANGEINFODATA:
1301                 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1302                 break;
1303         default:
1304                 break;
1305         }
1306
1307         return rtnl_event_type;
1308 }
1309
1310 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1311                             int type, u32 pid, u32 seq, u32 change,
1312                             unsigned int flags, u32 ext_filter_mask,
1313                             u32 event)
1314 {
1315         struct ifinfomsg *ifm;
1316         struct nlmsghdr *nlh;
1317         struct nlattr *af_spec;
1318         struct rtnl_af_ops *af_ops;
1319         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1320
1321         ASSERT_RTNL();
1322         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1323         if (nlh == NULL)
1324                 return -EMSGSIZE;
1325
1326         ifm = nlmsg_data(nlh);
1327         ifm->ifi_family = AF_UNSPEC;
1328         ifm->__ifi_pad = 0;
1329         ifm->ifi_type = dev->type;
1330         ifm->ifi_index = dev->ifindex;
1331         ifm->ifi_flags = dev_get_flags(dev);
1332         ifm->ifi_change = change;
1333
1334         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1335             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1336             nla_put_u8(skb, IFLA_OPERSTATE,
1337                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1338             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1339             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1340             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1341             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1342             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1343             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1344             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1345 #ifdef CONFIG_RPS
1346             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1347 #endif
1348             (dev->ifindex != dev_get_iflink(dev) &&
1349              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1350             (upper_dev &&
1351              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1352             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1353             (dev->qdisc &&
1354              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1355             (dev->ifalias &&
1356              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1357             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1358                         atomic_read(&dev->carrier_changes)) ||
1359             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1360                 goto nla_put_failure;
1361
1362         if (event != IFLA_EVENT_NONE) {
1363                 if (nla_put_u32(skb, IFLA_EVENT, event))
1364                         goto nla_put_failure;
1365         }
1366
1367         if (rtnl_fill_link_ifmap(skb, dev))
1368                 goto nla_put_failure;
1369
1370         if (dev->addr_len) {
1371                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1372                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1373                         goto nla_put_failure;
1374         }
1375
1376         if (rtnl_phys_port_id_fill(skb, dev))
1377                 goto nla_put_failure;
1378
1379         if (rtnl_phys_port_name_fill(skb, dev))
1380                 goto nla_put_failure;
1381
1382         if (rtnl_phys_switch_id_fill(skb, dev))
1383                 goto nla_put_failure;
1384
1385         if (rtnl_fill_stats(skb, dev))
1386                 goto nla_put_failure;
1387
1388         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1389             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1390                 goto nla_put_failure;
1391
1392         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent &&
1393             ext_filter_mask & RTEXT_FILTER_VF) {
1394                 int i;
1395                 struct nlattr *vfinfo;
1396                 int num_vfs = dev_num_vf(dev->dev.parent);
1397
1398                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1399                 if (!vfinfo)
1400                         goto nla_put_failure;
1401                 for (i = 0; i < num_vfs; i++) {
1402                         if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1403                                 goto nla_put_failure;
1404                 }
1405
1406                 nla_nest_end(skb, vfinfo);
1407         }
1408
1409         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1410                 goto nla_put_failure;
1411
1412         if (rtnl_xdp_fill(skb, dev))
1413                 goto nla_put_failure;
1414
1415         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1416                 if (rtnl_link_fill(skb, dev) < 0)
1417                         goto nla_put_failure;
1418         }
1419
1420         if (dev->rtnl_link_ops &&
1421             dev->rtnl_link_ops->get_link_net) {
1422                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1423
1424                 if (!net_eq(dev_net(dev), link_net)) {
1425                         int id = peernet2id_alloc(dev_net(dev), link_net);
1426
1427                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1428                                 goto nla_put_failure;
1429                 }
1430         }
1431
1432         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1433                 goto nla_put_failure;
1434
1435         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1436                 if (af_ops->fill_link_af) {
1437                         struct nlattr *af;
1438                         int err;
1439
1440                         if (!(af = nla_nest_start(skb, af_ops->family)))
1441                                 goto nla_put_failure;
1442
1443                         err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1444
1445                         /*
1446                          * Caller may return ENODATA to indicate that there
1447                          * was no data to be dumped. This is not an error, it
1448                          * means we should trim the attribute header and
1449                          * continue.
1450                          */
1451                         if (err == -ENODATA)
1452                                 nla_nest_cancel(skb, af);
1453                         else if (err < 0)
1454                                 goto nla_put_failure;
1455
1456                         nla_nest_end(skb, af);
1457                 }
1458         }
1459
1460         nla_nest_end(skb, af_spec);
1461
1462         nlmsg_end(skb, nlh);
1463         return 0;
1464
1465 nla_put_failure:
1466         nlmsg_cancel(skb, nlh);
1467         return -EMSGSIZE;
1468 }
1469
1470 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1471         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1472         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1473         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1474         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1475         [IFLA_MTU]              = { .type = NLA_U32 },
1476         [IFLA_LINK]             = { .type = NLA_U32 },
1477         [IFLA_MASTER]           = { .type = NLA_U32 },
1478         [IFLA_CARRIER]          = { .type = NLA_U8 },
1479         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1480         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1481         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1482         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1483         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1484         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1485         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1486         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1487         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1488         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1489         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1490         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1491         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1492         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1493         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1494         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1495         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1496         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1497         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1498         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1499         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1500         [IFLA_XDP]              = { .type = NLA_NESTED },
1501         [IFLA_EVENT]            = { .type = NLA_U32 },
1502         [IFLA_GROUP]            = { .type = NLA_U32 },
1503 };
1504
1505 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1506         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1507         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1508         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1509         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1510 };
1511
1512 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1513         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1514         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1515         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1516         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1517         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1518         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1519         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1520         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1521         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1522         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1523         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1524         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1525 };
1526
1527 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1528         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1529         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1530                                     .len = PORT_PROFILE_MAX },
1531         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1532                                       .len = PORT_UUID_MAX },
1533         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1534                                     .len = PORT_UUID_MAX },
1535         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1536         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1537
1538         /* Unused, but we need to keep it here since user space could
1539          * fill it. It's also broken with regard to NLA_BINARY use in
1540          * combination with structs.
1541          */
1542         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1543                                     .len = sizeof(struct ifla_port_vsi) },
1544 };
1545
1546 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1547         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1548         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1549         [IFLA_XDP_FLAGS]        = { .type = NLA_U32 },
1550         [IFLA_XDP_PROG_ID]      = { .type = NLA_U32 },
1551 };
1552
1553 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1554 {
1555         const struct rtnl_link_ops *ops = NULL;
1556         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1557
1558         if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla,
1559                              ifla_info_policy, NULL) < 0)
1560                 return NULL;
1561
1562         if (linfo[IFLA_INFO_KIND]) {
1563                 char kind[MODULE_NAME_LEN];
1564
1565                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1566                 ops = rtnl_link_ops_get(kind);
1567         }
1568
1569         return ops;
1570 }
1571
1572 static bool link_master_filtered(struct net_device *dev, int master_idx)
1573 {
1574         struct net_device *master;
1575
1576         if (!master_idx)
1577                 return false;
1578
1579         master = netdev_master_upper_dev_get(dev);
1580         if (!master || master->ifindex != master_idx)
1581                 return true;
1582
1583         return false;
1584 }
1585
1586 static bool link_kind_filtered(const struct net_device *dev,
1587                                const struct rtnl_link_ops *kind_ops)
1588 {
1589         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1590                 return true;
1591
1592         return false;
1593 }
1594
1595 static bool link_dump_filtered(struct net_device *dev,
1596                                int master_idx,
1597                                const struct rtnl_link_ops *kind_ops)
1598 {
1599         if (link_master_filtered(dev, master_idx) ||
1600             link_kind_filtered(dev, kind_ops))
1601                 return true;
1602
1603         return false;
1604 }
1605
1606 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1607 {
1608         struct net *net = sock_net(skb->sk);
1609         int h, s_h;
1610         int idx = 0, s_idx;
1611         struct net_device *dev;
1612         struct hlist_head *head;
1613         struct nlattr *tb[IFLA_MAX+1];
1614         u32 ext_filter_mask = 0;
1615         const struct rtnl_link_ops *kind_ops = NULL;
1616         unsigned int flags = NLM_F_MULTI;
1617         int master_idx = 0;
1618         int err;
1619         int hdrlen;
1620
1621         s_h = cb->args[0];
1622         s_idx = cb->args[1];
1623
1624         /* A hack to preserve kernel<->userspace interface.
1625          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1626          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1627          * what iproute2 < v3.9.0 used.
1628          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1629          * attribute, its netlink message is shorter than struct ifinfomsg.
1630          */
1631         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1632                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1633
1634         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX,
1635                         ifla_policy, NULL) >= 0) {
1636                 if (tb[IFLA_EXT_MASK])
1637                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1638
1639                 if (tb[IFLA_MASTER])
1640                         master_idx = nla_get_u32(tb[IFLA_MASTER]);
1641
1642                 if (tb[IFLA_LINKINFO])
1643                         kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1644
1645                 if (master_idx || kind_ops)
1646                         flags |= NLM_F_DUMP_FILTERED;
1647         }
1648
1649         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1650                 idx = 0;
1651                 head = &net->dev_index_head[h];
1652                 hlist_for_each_entry(dev, head, index_hlist) {
1653                         if (link_dump_filtered(dev, master_idx, kind_ops))
1654                                 goto cont;
1655                         if (idx < s_idx)
1656                                 goto cont;
1657                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1658                                                NETLINK_CB(cb->skb).portid,
1659                                                cb->nlh->nlmsg_seq, 0,
1660                                                flags,
1661                                                ext_filter_mask, 0);
1662
1663                         if (err < 0) {
1664                                 if (likely(skb->len))
1665                                         goto out;
1666
1667                                 goto out_err;
1668                         }
1669 cont:
1670                         idx++;
1671                 }
1672         }
1673 out:
1674         err = skb->len;
1675 out_err:
1676         cb->args[1] = idx;
1677         cb->args[0] = h;
1678         cb->seq = net->dev_base_seq;
1679         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1680
1681         return err;
1682 }
1683
1684 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
1685                         struct netlink_ext_ack *exterr)
1686 {
1687         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy, exterr);
1688 }
1689 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1690
1691 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1692 {
1693         struct net *net;
1694         /* Examine the link attributes and figure out which
1695          * network namespace we are talking about.
1696          */
1697         if (tb[IFLA_NET_NS_PID])
1698                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1699         else if (tb[IFLA_NET_NS_FD])
1700                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1701         else
1702                 net = get_net(src_net);
1703         return net;
1704 }
1705 EXPORT_SYMBOL(rtnl_link_get_net);
1706
1707 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1708 {
1709         if (dev) {
1710                 if (tb[IFLA_ADDRESS] &&
1711                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1712                         return -EINVAL;
1713
1714                 if (tb[IFLA_BROADCAST] &&
1715                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1716                         return -EINVAL;
1717         }
1718
1719         if (tb[IFLA_AF_SPEC]) {
1720                 struct nlattr *af;
1721                 int rem, err;
1722
1723                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1724                         const struct rtnl_af_ops *af_ops;
1725
1726                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1727                                 return -EAFNOSUPPORT;
1728
1729                         if (!af_ops->set_link_af)
1730                                 return -EOPNOTSUPP;
1731
1732                         if (af_ops->validate_link_af) {
1733                                 err = af_ops->validate_link_af(dev, af);
1734                                 if (err < 0)
1735                                         return err;
1736                         }
1737                 }
1738         }
1739
1740         return 0;
1741 }
1742
1743 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
1744                                   int guid_type)
1745 {
1746         const struct net_device_ops *ops = dev->netdev_ops;
1747
1748         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
1749 }
1750
1751 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
1752 {
1753         if (dev->type != ARPHRD_INFINIBAND)
1754                 return -EOPNOTSUPP;
1755
1756         return handle_infiniband_guid(dev, ivt, guid_type);
1757 }
1758
1759 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1760 {
1761         const struct net_device_ops *ops = dev->netdev_ops;
1762         int err = -EINVAL;
1763
1764         if (tb[IFLA_VF_MAC]) {
1765                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1766
1767                 err = -EOPNOTSUPP;
1768                 if (ops->ndo_set_vf_mac)
1769                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
1770                                                   ivm->mac);
1771                 if (err < 0)
1772                         return err;
1773         }
1774
1775         if (tb[IFLA_VF_VLAN]) {
1776                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1777
1778                 err = -EOPNOTSUPP;
1779                 if (ops->ndo_set_vf_vlan)
1780                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1781                                                    ivv->qos,
1782                                                    htons(ETH_P_8021Q));
1783                 if (err < 0)
1784                         return err;
1785         }
1786
1787         if (tb[IFLA_VF_VLAN_LIST]) {
1788                 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
1789                 struct nlattr *attr;
1790                 int rem, len = 0;
1791
1792                 err = -EOPNOTSUPP;
1793                 if (!ops->ndo_set_vf_vlan)
1794                         return err;
1795
1796                 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
1797                         if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
1798                             nla_len(attr) < NLA_HDRLEN) {
1799                                 return -EINVAL;
1800                         }
1801                         if (len >= MAX_VLAN_LIST_LEN)
1802                                 return -EOPNOTSUPP;
1803                         ivvl[len] = nla_data(attr);
1804
1805                         len++;
1806                 }
1807                 if (len == 0)
1808                         return -EINVAL;
1809
1810                 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
1811                                            ivvl[0]->qos, ivvl[0]->vlan_proto);
1812                 if (err < 0)
1813                         return err;
1814         }
1815
1816         if (tb[IFLA_VF_TX_RATE]) {
1817                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1818                 struct ifla_vf_info ivf;
1819
1820                 err = -EOPNOTSUPP;
1821                 if (ops->ndo_get_vf_config)
1822                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1823                 if (err < 0)
1824                         return err;
1825
1826                 err = -EOPNOTSUPP;
1827                 if (ops->ndo_set_vf_rate)
1828                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1829                                                    ivf.min_tx_rate,
1830                                                    ivt->rate);
1831                 if (err < 0)
1832                         return err;
1833         }
1834
1835         if (tb[IFLA_VF_RATE]) {
1836                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1837
1838                 err = -EOPNOTSUPP;
1839                 if (ops->ndo_set_vf_rate)
1840                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1841                                                    ivt->min_tx_rate,
1842                                                    ivt->max_tx_rate);
1843                 if (err < 0)
1844                         return err;
1845         }
1846
1847         if (tb[IFLA_VF_SPOOFCHK]) {
1848                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1849
1850                 err = -EOPNOTSUPP;
1851                 if (ops->ndo_set_vf_spoofchk)
1852                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1853                                                        ivs->setting);
1854                 if (err < 0)
1855                         return err;
1856         }
1857
1858         if (tb[IFLA_VF_LINK_STATE]) {
1859                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1860
1861                 err = -EOPNOTSUPP;
1862                 if (ops->ndo_set_vf_link_state)
1863                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1864                                                          ivl->link_state);
1865                 if (err < 0)
1866                         return err;
1867         }
1868
1869         if (tb[IFLA_VF_RSS_QUERY_EN]) {
1870                 struct ifla_vf_rss_query_en *ivrssq_en;
1871
1872                 err = -EOPNOTSUPP;
1873                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1874                 if (ops->ndo_set_vf_rss_query_en)
1875                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1876                                                            ivrssq_en->setting);
1877                 if (err < 0)
1878                         return err;
1879         }
1880
1881         if (tb[IFLA_VF_TRUST]) {
1882                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1883
1884                 err = -EOPNOTSUPP;
1885                 if (ops->ndo_set_vf_trust)
1886                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1887                 if (err < 0)
1888                         return err;
1889         }
1890
1891         if (tb[IFLA_VF_IB_NODE_GUID]) {
1892                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
1893
1894                 if (!ops->ndo_set_vf_guid)
1895                         return -EOPNOTSUPP;
1896
1897                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
1898         }
1899
1900         if (tb[IFLA_VF_IB_PORT_GUID]) {
1901                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
1902
1903                 if (!ops->ndo_set_vf_guid)
1904                         return -EOPNOTSUPP;
1905
1906                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
1907         }
1908
1909         return err;
1910 }
1911
1912 static int do_set_master(struct net_device *dev, int ifindex)
1913 {
1914         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1915         const struct net_device_ops *ops;
1916         int err;
1917
1918         if (upper_dev) {
1919                 if (upper_dev->ifindex == ifindex)
1920                         return 0;
1921                 ops = upper_dev->netdev_ops;
1922                 if (ops->ndo_del_slave) {
1923                         err = ops->ndo_del_slave(upper_dev, dev);
1924                         if (err)
1925                                 return err;
1926                 } else {
1927                         return -EOPNOTSUPP;
1928                 }
1929         }
1930
1931         if (ifindex) {
1932                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1933                 if (!upper_dev)
1934                         return -EINVAL;
1935                 ops = upper_dev->netdev_ops;
1936                 if (ops->ndo_add_slave) {
1937                         err = ops->ndo_add_slave(upper_dev, dev);
1938                         if (err)
1939                                 return err;
1940                 } else {
1941                         return -EOPNOTSUPP;
1942                 }
1943         }
1944         return 0;
1945 }
1946
1947 #define DO_SETLINK_MODIFIED     0x01
1948 /* notify flag means notify + modified. */
1949 #define DO_SETLINK_NOTIFY       0x03
1950 static int do_setlink(const struct sk_buff *skb,
1951                       struct net_device *dev, struct ifinfomsg *ifm,
1952                       struct netlink_ext_ack *extack,
1953                       struct nlattr **tb, char *ifname, int status)
1954 {
1955         const struct net_device_ops *ops = dev->netdev_ops;
1956         int err;
1957
1958         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1959                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1960                 if (IS_ERR(net)) {
1961                         err = PTR_ERR(net);
1962                         goto errout;
1963                 }
1964                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1965                         put_net(net);
1966                         err = -EPERM;
1967                         goto errout;
1968                 }
1969                 err = dev_change_net_namespace(dev, net, ifname);
1970                 put_net(net);
1971                 if (err)
1972                         goto errout;
1973                 status |= DO_SETLINK_MODIFIED;
1974         }
1975
1976         if (tb[IFLA_MAP]) {
1977                 struct rtnl_link_ifmap *u_map;
1978                 struct ifmap k_map;
1979
1980                 if (!ops->ndo_set_config) {
1981                         err = -EOPNOTSUPP;
1982                         goto errout;
1983                 }
1984
1985                 if (!netif_device_present(dev)) {
1986                         err = -ENODEV;
1987                         goto errout;
1988                 }
1989
1990                 u_map = nla_data(tb[IFLA_MAP]);
1991                 k_map.mem_start = (unsigned long) u_map->mem_start;
1992                 k_map.mem_end = (unsigned long) u_map->mem_end;
1993                 k_map.base_addr = (unsigned short) u_map->base_addr;
1994                 k_map.irq = (unsigned char) u_map->irq;
1995                 k_map.dma = (unsigned char) u_map->dma;
1996                 k_map.port = (unsigned char) u_map->port;
1997
1998                 err = ops->ndo_set_config(dev, &k_map);
1999                 if (err < 0)
2000                         goto errout;
2001
2002                 status |= DO_SETLINK_NOTIFY;
2003         }
2004
2005         if (tb[IFLA_ADDRESS]) {
2006                 struct sockaddr *sa;
2007                 int len;
2008
2009                 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2010                                                   sizeof(*sa));
2011                 sa = kmalloc(len, GFP_KERNEL);
2012                 if (!sa) {
2013                         err = -ENOMEM;
2014                         goto errout;
2015                 }
2016                 sa->sa_family = dev->type;
2017                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2018                        dev->addr_len);
2019                 err = dev_set_mac_address(dev, sa);
2020                 kfree(sa);
2021                 if (err)
2022                         goto errout;
2023                 status |= DO_SETLINK_MODIFIED;
2024         }
2025
2026         if (tb[IFLA_MTU]) {
2027                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2028                 if (err < 0)
2029                         goto errout;
2030                 status |= DO_SETLINK_MODIFIED;
2031         }
2032
2033         if (tb[IFLA_GROUP]) {
2034                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2035                 status |= DO_SETLINK_NOTIFY;
2036         }
2037
2038         /*
2039          * Interface selected by interface index but interface
2040          * name provided implies that a name change has been
2041          * requested.
2042          */
2043         if (ifm->ifi_index > 0 && ifname[0]) {
2044                 err = dev_change_name(dev, ifname);
2045                 if (err < 0)
2046                         goto errout;
2047                 status |= DO_SETLINK_MODIFIED;
2048         }
2049
2050         if (tb[IFLA_IFALIAS]) {
2051                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2052                                     nla_len(tb[IFLA_IFALIAS]));
2053                 if (err < 0)
2054                         goto errout;
2055                 status |= DO_SETLINK_NOTIFY;
2056         }
2057
2058         if (tb[IFLA_BROADCAST]) {
2059                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2060                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2061         }
2062
2063         if (ifm->ifi_flags || ifm->ifi_change) {
2064                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2065                 if (err < 0)
2066                         goto errout;
2067         }
2068
2069         if (tb[IFLA_MASTER]) {
2070                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
2071                 if (err)
2072                         goto errout;
2073                 status |= DO_SETLINK_MODIFIED;
2074         }
2075
2076         if (tb[IFLA_CARRIER]) {
2077                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2078                 if (err)
2079                         goto errout;
2080                 status |= DO_SETLINK_MODIFIED;
2081         }
2082
2083         if (tb[IFLA_TXQLEN]) {
2084                 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2085                 unsigned int orig_len = dev->tx_queue_len;
2086
2087                 if (dev->tx_queue_len ^ value) {
2088                         dev->tx_queue_len = value;
2089                         err = call_netdevice_notifiers(
2090                               NETDEV_CHANGE_TX_QUEUE_LEN, dev);
2091                         err = notifier_to_errno(err);
2092                         if (err) {
2093                                 dev->tx_queue_len = orig_len;
2094                                 goto errout;
2095                         }
2096                         status |= DO_SETLINK_MODIFIED;
2097                 }
2098         }
2099
2100         if (tb[IFLA_OPERSTATE])
2101                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2102
2103         if (tb[IFLA_LINKMODE]) {
2104                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2105
2106                 write_lock_bh(&dev_base_lock);
2107                 if (dev->link_mode ^ value)
2108                         status |= DO_SETLINK_NOTIFY;
2109                 dev->link_mode = value;
2110                 write_unlock_bh(&dev_base_lock);
2111         }
2112
2113         if (tb[IFLA_VFINFO_LIST]) {
2114                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2115                 struct nlattr *attr;
2116                 int rem;
2117
2118                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2119                         if (nla_type(attr) != IFLA_VF_INFO ||
2120                             nla_len(attr) < NLA_HDRLEN) {
2121                                 err = -EINVAL;
2122                                 goto errout;
2123                         }
2124                         err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2125                                                ifla_vf_policy, NULL);
2126                         if (err < 0)
2127                                 goto errout;
2128                         err = do_setvfinfo(dev, vfinfo);
2129                         if (err < 0)
2130                                 goto errout;
2131                         status |= DO_SETLINK_NOTIFY;
2132                 }
2133         }
2134         err = 0;
2135
2136         if (tb[IFLA_VF_PORTS]) {
2137                 struct nlattr *port[IFLA_PORT_MAX+1];
2138                 struct nlattr *attr;
2139                 int vf;
2140                 int rem;
2141
2142                 err = -EOPNOTSUPP;
2143                 if (!ops->ndo_set_vf_port)
2144                         goto errout;
2145
2146                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2147                         if (nla_type(attr) != IFLA_VF_PORT ||
2148                             nla_len(attr) < NLA_HDRLEN) {
2149                                 err = -EINVAL;
2150                                 goto errout;
2151                         }
2152                         err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2153                                                ifla_port_policy, NULL);
2154                         if (err < 0)
2155                                 goto errout;
2156                         if (!port[IFLA_PORT_VF]) {
2157                                 err = -EOPNOTSUPP;
2158                                 goto errout;
2159                         }
2160                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2161                         err = ops->ndo_set_vf_port(dev, vf, port);
2162                         if (err < 0)
2163                                 goto errout;
2164                         status |= DO_SETLINK_NOTIFY;
2165                 }
2166         }
2167         err = 0;
2168
2169         if (tb[IFLA_PORT_SELF]) {
2170                 struct nlattr *port[IFLA_PORT_MAX+1];
2171
2172                 err = nla_parse_nested(port, IFLA_PORT_MAX,
2173                                        tb[IFLA_PORT_SELF], ifla_port_policy,
2174                                        NULL);
2175                 if (err < 0)
2176                         goto errout;
2177
2178                 err = -EOPNOTSUPP;
2179                 if (ops->ndo_set_vf_port)
2180                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2181                 if (err < 0)
2182                         goto errout;
2183                 status |= DO_SETLINK_NOTIFY;
2184         }
2185
2186         if (tb[IFLA_AF_SPEC]) {
2187                 struct nlattr *af;
2188                 int rem;
2189
2190                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2191                         const struct rtnl_af_ops *af_ops;
2192
2193                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
2194                                 BUG();
2195
2196                         err = af_ops->set_link_af(dev, af);
2197                         if (err < 0)
2198                                 goto errout;
2199
2200                         status |= DO_SETLINK_NOTIFY;
2201                 }
2202         }
2203         err = 0;
2204
2205         if (tb[IFLA_PROTO_DOWN]) {
2206                 err = dev_change_proto_down(dev,
2207                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2208                 if (err)
2209                         goto errout;
2210                 status |= DO_SETLINK_NOTIFY;
2211         }
2212
2213         if (tb[IFLA_XDP]) {
2214                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2215                 u32 xdp_flags = 0;
2216
2217                 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2218                                        ifla_xdp_policy, NULL);
2219                 if (err < 0)
2220                         goto errout;
2221
2222                 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2223                         err = -EINVAL;
2224                         goto errout;
2225                 }
2226
2227                 if (xdp[IFLA_XDP_FLAGS]) {
2228                         xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2229                         if (xdp_flags & ~XDP_FLAGS_MASK) {
2230                                 err = -EINVAL;
2231                                 goto errout;
2232                         }
2233                         if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2234                                 err = -EINVAL;
2235                                 goto errout;
2236                         }
2237                 }
2238
2239                 if (xdp[IFLA_XDP_FD]) {
2240                         err = dev_change_xdp_fd(dev, extack,
2241                                                 nla_get_s32(xdp[IFLA_XDP_FD]),
2242                                                 xdp_flags);
2243                         if (err)
2244                                 goto errout;
2245                         status |= DO_SETLINK_NOTIFY;
2246                 }
2247         }
2248
2249 errout:
2250         if (status & DO_SETLINK_MODIFIED) {
2251                 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2252                         netdev_state_change(dev);
2253
2254                 if (err < 0)
2255                         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",
2256                                              dev->name);
2257         }
2258
2259         return err;
2260 }
2261
2262 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2263                         struct netlink_ext_ack *extack)
2264 {
2265         struct net *net = sock_net(skb->sk);
2266         struct ifinfomsg *ifm;
2267         struct net_device *dev;
2268         int err;
2269         struct nlattr *tb[IFLA_MAX+1];
2270         char ifname[IFNAMSIZ];
2271
2272         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy,
2273                           extack);
2274         if (err < 0)
2275                 goto errout;
2276
2277         if (tb[IFLA_IFNAME])
2278                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2279         else
2280                 ifname[0] = '\0';
2281
2282         err = -EINVAL;
2283         ifm = nlmsg_data(nlh);
2284         if (ifm->ifi_index > 0)
2285                 dev = __dev_get_by_index(net, ifm->ifi_index);
2286         else if (tb[IFLA_IFNAME])
2287                 dev = __dev_get_by_name(net, ifname);
2288         else
2289                 goto errout;
2290
2291         if (dev == NULL) {
2292                 err = -ENODEV;
2293                 goto errout;
2294         }
2295
2296         err = validate_linkmsg(dev, tb);
2297         if (err < 0)
2298                 goto errout;
2299
2300         err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2301 errout:
2302         return err;
2303 }
2304
2305 static int rtnl_group_dellink(const struct net *net, int group)
2306 {
2307         struct net_device *dev, *aux;
2308         LIST_HEAD(list_kill);
2309         bool found = false;
2310
2311         if (!group)
2312                 return -EPERM;
2313
2314         for_each_netdev(net, dev) {
2315                 if (dev->group == group) {
2316                         const struct rtnl_link_ops *ops;
2317
2318                         found = true;
2319                         ops = dev->rtnl_link_ops;
2320                         if (!ops || !ops->dellink)
2321                                 return -EOPNOTSUPP;
2322                 }
2323         }
2324
2325         if (!found)
2326                 return -ENODEV;
2327
2328         for_each_netdev_safe(net, dev, aux) {
2329                 if (dev->group == group) {
2330                         const struct rtnl_link_ops *ops;
2331
2332                         ops = dev->rtnl_link_ops;
2333                         ops->dellink(dev, &list_kill);
2334                 }
2335         }
2336         unregister_netdevice_many(&list_kill);
2337
2338         return 0;
2339 }
2340
2341 int rtnl_delete_link(struct net_device *dev)
2342 {
2343         const struct rtnl_link_ops *ops;
2344         LIST_HEAD(list_kill);
2345
2346         ops = dev->rtnl_link_ops;
2347         if (!ops || !ops->dellink)
2348                 return -EOPNOTSUPP;
2349
2350         ops->dellink(dev, &list_kill);
2351         unregister_netdevice_many(&list_kill);
2352
2353         return 0;
2354 }
2355 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2356
2357 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2358                         struct netlink_ext_ack *extack)
2359 {
2360         struct net *net = sock_net(skb->sk);
2361         struct net_device *dev;
2362         struct ifinfomsg *ifm;
2363         char ifname[IFNAMSIZ];
2364         struct nlattr *tb[IFLA_MAX+1];
2365         int err;
2366
2367         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2368         if (err < 0)
2369                 return err;
2370
2371         if (tb[IFLA_IFNAME])
2372                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2373
2374         ifm = nlmsg_data(nlh);
2375         if (ifm->ifi_index > 0)
2376                 dev = __dev_get_by_index(net, ifm->ifi_index);
2377         else if (tb[IFLA_IFNAME])
2378                 dev = __dev_get_by_name(net, ifname);
2379         else if (tb[IFLA_GROUP])
2380                 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2381         else
2382                 return -EINVAL;
2383
2384         if (!dev)
2385                 return -ENODEV;
2386
2387         return rtnl_delete_link(dev);
2388 }
2389
2390 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2391 {
2392         unsigned int old_flags;
2393         int err;
2394
2395         old_flags = dev->flags;
2396         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2397                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2398                 if (err < 0)
2399                         return err;
2400         }
2401
2402         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2403
2404         __dev_notify_flags(dev, old_flags, ~0U);
2405         return 0;
2406 }
2407 EXPORT_SYMBOL(rtnl_configure_link);
2408
2409 struct net_device *rtnl_create_link(struct net *net,
2410         const char *ifname, unsigned char name_assign_type,
2411         const struct rtnl_link_ops *ops, struct nlattr *tb[])
2412 {
2413         struct net_device *dev;
2414         unsigned int num_tx_queues = 1;
2415         unsigned int num_rx_queues = 1;
2416
2417         if (tb[IFLA_NUM_TX_QUEUES])
2418                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2419         else if (ops->get_num_tx_queues)
2420                 num_tx_queues = ops->get_num_tx_queues();
2421
2422         if (tb[IFLA_NUM_RX_QUEUES])
2423                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2424         else if (ops->get_num_rx_queues)
2425                 num_rx_queues = ops->get_num_rx_queues();
2426
2427         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2428                                ops->setup, num_tx_queues, num_rx_queues);
2429         if (!dev)
2430                 return ERR_PTR(-ENOMEM);
2431
2432         dev_net_set(dev, net);
2433         dev->rtnl_link_ops = ops;
2434         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2435
2436         if (tb[IFLA_MTU])
2437                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2438         if (tb[IFLA_ADDRESS]) {
2439                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2440                                 nla_len(tb[IFLA_ADDRESS]));
2441                 dev->addr_assign_type = NET_ADDR_SET;
2442         }
2443         if (tb[IFLA_BROADCAST])
2444                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2445                                 nla_len(tb[IFLA_BROADCAST]));
2446         if (tb[IFLA_TXQLEN])
2447                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2448         if (tb[IFLA_OPERSTATE])
2449                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2450         if (tb[IFLA_LINKMODE])
2451                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2452         if (tb[IFLA_GROUP])
2453                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2454
2455         return dev;
2456 }
2457 EXPORT_SYMBOL(rtnl_create_link);
2458
2459 static int rtnl_group_changelink(const struct sk_buff *skb,
2460                 struct net *net, int group,
2461                 struct ifinfomsg *ifm,
2462                 struct netlink_ext_ack *extack,
2463                 struct nlattr **tb)
2464 {
2465         struct net_device *dev, *aux;
2466         int err;
2467
2468         for_each_netdev_safe(net, dev, aux) {
2469                 if (dev->group == group) {
2470                         err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
2471                         if (err < 0)
2472                                 return err;
2473                 }
2474         }
2475
2476         return 0;
2477 }
2478
2479 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2480                         struct netlink_ext_ack *extack)
2481 {
2482         struct net *net = sock_net(skb->sk);
2483         const struct rtnl_link_ops *ops;
2484         const struct rtnl_link_ops *m_ops = NULL;
2485         struct net_device *dev;
2486         struct net_device *master_dev = NULL;
2487         struct ifinfomsg *ifm;
2488         char kind[MODULE_NAME_LEN];
2489         char ifname[IFNAMSIZ];
2490         struct nlattr *tb[IFLA_MAX+1];
2491         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2492         unsigned char name_assign_type = NET_NAME_USER;
2493         int err;
2494
2495 #ifdef CONFIG_MODULES
2496 replay:
2497 #endif
2498         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2499         if (err < 0)
2500                 return err;
2501
2502         if (tb[IFLA_IFNAME])
2503                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2504         else
2505                 ifname[0] = '\0';
2506
2507         ifm = nlmsg_data(nlh);
2508         if (ifm->ifi_index > 0)
2509                 dev = __dev_get_by_index(net, ifm->ifi_index);
2510         else {
2511                 if (ifname[0])
2512                         dev = __dev_get_by_name(net, ifname);
2513                 else
2514                         dev = NULL;
2515         }
2516
2517         if (dev) {
2518                 master_dev = netdev_master_upper_dev_get(dev);
2519                 if (master_dev)
2520                         m_ops = master_dev->rtnl_link_ops;
2521         }
2522
2523         err = validate_linkmsg(dev, tb);
2524         if (err < 0)
2525                 return err;
2526
2527         if (tb[IFLA_LINKINFO]) {
2528                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2529                                        tb[IFLA_LINKINFO], ifla_info_policy,
2530                                        NULL);
2531                 if (err < 0)
2532                         return err;
2533         } else
2534                 memset(linkinfo, 0, sizeof(linkinfo));
2535
2536         if (linkinfo[IFLA_INFO_KIND]) {
2537                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2538                 ops = rtnl_link_ops_get(kind);
2539         } else {
2540                 kind[0] = '\0';
2541                 ops = NULL;
2542         }
2543
2544         if (1) {
2545                 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2546                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2547                 struct nlattr **data = NULL;
2548                 struct nlattr **slave_data = NULL;
2549                 struct net *dest_net, *link_net = NULL;
2550
2551                 if (ops) {
2552                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2553                                 err = nla_parse_nested(attr, ops->maxtype,
2554                                                        linkinfo[IFLA_INFO_DATA],
2555                                                        ops->policy, NULL);
2556                                 if (err < 0)
2557                                         return err;
2558                                 data = attr;
2559                         }
2560                         if (ops->validate) {
2561                                 err = ops->validate(tb, data, extack);
2562                                 if (err < 0)
2563                                         return err;
2564                         }
2565                 }
2566
2567                 if (m_ops) {
2568                         if (m_ops->slave_maxtype &&
2569                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
2570                                 err = nla_parse_nested(slave_attr,
2571                                                        m_ops->slave_maxtype,
2572                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
2573                                                        m_ops->slave_policy,
2574                                                        NULL);
2575                                 if (err < 0)
2576                                         return err;
2577                                 slave_data = slave_attr;
2578                         }
2579                         if (m_ops->slave_validate) {
2580                                 err = m_ops->slave_validate(tb, slave_data,
2581                                                             extack);
2582                                 if (err < 0)
2583                                         return err;
2584                         }
2585                 }
2586
2587                 if (dev) {
2588                         int status = 0;
2589
2590                         if (nlh->nlmsg_flags & NLM_F_EXCL)
2591                                 return -EEXIST;
2592                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
2593                                 return -EOPNOTSUPP;
2594
2595                         if (linkinfo[IFLA_INFO_DATA]) {
2596                                 if (!ops || ops != dev->rtnl_link_ops ||
2597                                     !ops->changelink)
2598                                         return -EOPNOTSUPP;
2599
2600                                 err = ops->changelink(dev, tb, data, extack);
2601                                 if (err < 0)
2602                                         return err;
2603                                 status |= DO_SETLINK_NOTIFY;
2604                         }
2605
2606                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2607                                 if (!m_ops || !m_ops->slave_changelink)
2608                                         return -EOPNOTSUPP;
2609
2610                                 err = m_ops->slave_changelink(master_dev, dev,
2611                                                               tb, slave_data,
2612                                                               extack);
2613                                 if (err < 0)
2614                                         return err;
2615                                 status |= DO_SETLINK_NOTIFY;
2616                         }
2617
2618                         return do_setlink(skb, dev, ifm, extack, tb, ifname,
2619                                           status);
2620                 }
2621
2622                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2623                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2624                                 return rtnl_group_changelink(skb, net,
2625                                                 nla_get_u32(tb[IFLA_GROUP]),
2626                                                 ifm, extack, tb);
2627                         return -ENODEV;
2628                 }
2629
2630                 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
2631                         return -EOPNOTSUPP;
2632
2633                 if (!ops) {
2634 #ifdef CONFIG_MODULES
2635                         if (kind[0]) {
2636                                 __rtnl_unlock();
2637                                 request_module("rtnl-link-%s", kind);
2638                                 rtnl_lock();
2639                                 ops = rtnl_link_ops_get(kind);
2640                                 if (ops)
2641                                         goto replay;
2642                         }
2643 #endif
2644                         return -EOPNOTSUPP;
2645                 }
2646
2647                 if (!ops->setup)
2648                         return -EOPNOTSUPP;
2649
2650                 if (!ifname[0]) {
2651                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2652                         name_assign_type = NET_NAME_ENUM;
2653                 }
2654
2655                 dest_net = rtnl_link_get_net(net, tb);
2656                 if (IS_ERR(dest_net))
2657                         return PTR_ERR(dest_net);
2658
2659                 err = -EPERM;
2660                 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2661                         goto out;
2662
2663                 if (tb[IFLA_LINK_NETNSID]) {
2664                         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2665
2666                         link_net = get_net_ns_by_id(dest_net, id);
2667                         if (!link_net) {
2668                                 err =  -EINVAL;
2669                                 goto out;
2670                         }
2671                         err = -EPERM;
2672                         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2673                                 goto out;
2674                 }
2675
2676                 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2677                                        name_assign_type, ops, tb);
2678                 if (IS_ERR(dev)) {
2679                         err = PTR_ERR(dev);
2680                         goto out;
2681                 }
2682
2683                 dev->ifindex = ifm->ifi_index;
2684
2685                 if (ops->newlink) {
2686                         err = ops->newlink(link_net ? : net, dev, tb, data,
2687                                            extack);
2688                         /* Drivers should call free_netdev() in ->destructor
2689                          * and unregister it on failure after registration
2690                          * so that device could be finally freed in rtnl_unlock.
2691                          */
2692                         if (err < 0) {
2693                                 /* If device is not registered at all, free it now */
2694                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2695                                         free_netdev(dev);
2696                                 goto out;
2697                         }
2698                 } else {
2699                         err = register_netdevice(dev);
2700                         if (err < 0) {
2701                                 free_netdev(dev);
2702                                 goto out;
2703                         }
2704                 }
2705                 err = rtnl_configure_link(dev, ifm);
2706                 if (err < 0)
2707                         goto out_unregister;
2708                 if (link_net) {
2709                         err = dev_change_net_namespace(dev, dest_net, ifname);
2710                         if (err < 0)
2711                                 goto out_unregister;
2712                 }
2713                 if (tb[IFLA_MASTER]) {
2714                         err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
2715                         if (err)
2716                                 goto out_unregister;
2717                 }
2718 out:
2719                 if (link_net)
2720                         put_net(link_net);
2721                 put_net(dest_net);
2722                 return err;
2723 out_unregister:
2724                 if (ops->newlink) {
2725                         LIST_HEAD(list_kill);
2726
2727                         ops->dellink(dev, &list_kill);
2728                         unregister_netdevice_many(&list_kill);
2729                 } else {
2730                         unregister_netdevice(dev);
2731                 }
2732                 goto out;
2733         }
2734 }
2735
2736 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2737                         struct netlink_ext_ack *extack)
2738 {
2739         struct net *net = sock_net(skb->sk);
2740         struct ifinfomsg *ifm;
2741         char ifname[IFNAMSIZ];
2742         struct nlattr *tb[IFLA_MAX+1];
2743         struct net_device *dev = NULL;
2744         struct sk_buff *nskb;
2745         int err;
2746         u32 ext_filter_mask = 0;
2747
2748         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2749         if (err < 0)
2750                 return err;
2751
2752         if (tb[IFLA_IFNAME])
2753                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2754
2755         if (tb[IFLA_EXT_MASK])
2756                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2757
2758         ifm = nlmsg_data(nlh);
2759         if (ifm->ifi_index > 0)
2760                 dev = __dev_get_by_index(net, ifm->ifi_index);
2761         else if (tb[IFLA_IFNAME])
2762                 dev = __dev_get_by_name(net, ifname);
2763         else
2764                 return -EINVAL;
2765
2766         if (dev == NULL)
2767                 return -ENODEV;
2768
2769         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2770         if (nskb == NULL)
2771                 return -ENOBUFS;
2772
2773         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2774                                nlh->nlmsg_seq, 0, 0, ext_filter_mask, 0);
2775         if (err < 0) {
2776                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2777                 WARN_ON(err == -EMSGSIZE);
2778                 kfree_skb(nskb);
2779         } else
2780                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2781
2782         return err;
2783 }
2784
2785 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2786 {
2787         struct net *net = sock_net(skb->sk);
2788         struct net_device *dev;
2789         struct nlattr *tb[IFLA_MAX+1];
2790         u32 ext_filter_mask = 0;
2791         u16 min_ifinfo_dump_size = 0;
2792         int hdrlen;
2793
2794         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2795         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2796                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2797
2798         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
2799                 if (tb[IFLA_EXT_MASK])
2800                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2801         }
2802
2803         if (!ext_filter_mask)
2804                 return NLMSG_GOODSIZE;
2805         /*
2806          * traverse the list of net devices and compute the minimum
2807          * buffer size based upon the filter mask.
2808          */
2809         rcu_read_lock();
2810         for_each_netdev_rcu(net, dev) {
2811                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2812                                              if_nlmsg_size(dev,
2813                                                            ext_filter_mask));
2814         }
2815         rcu_read_unlock();
2816
2817         return nlmsg_total_size(min_ifinfo_dump_size);
2818 }
2819
2820 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2821 {
2822         int idx;
2823         int s_idx = cb->family;
2824
2825         if (s_idx == 0)
2826                 s_idx = 1;
2827
2828         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2829                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2830                 struct rtnl_link *handlers;
2831                 rtnl_dumpit_func dumpit;
2832
2833                 if (idx < s_idx || idx == PF_PACKET)
2834                         continue;
2835
2836                 handlers = rtnl_dereference(rtnl_msg_handlers[idx]);
2837                 if (!handlers)
2838                         continue;
2839
2840                 dumpit = READ_ONCE(handlers[type].dumpit);
2841                 if (!dumpit)
2842                         continue;
2843
2844                 if (idx > s_idx) {
2845                         memset(&cb->args[0], 0, sizeof(cb->args));
2846                         cb->prev_seq = 0;
2847                         cb->seq = 0;
2848                 }
2849                 if (dumpit(skb, cb))
2850                         break;
2851         }
2852         cb->family = idx;
2853
2854         return skb->len;
2855 }
2856
2857 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2858                                        unsigned int change,
2859                                        u32 event, gfp_t flags)
2860 {
2861         struct net *net = dev_net(dev);
2862         struct sk_buff *skb;
2863         int err = -ENOBUFS;
2864         size_t if_info_size;
2865
2866         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2867         if (skb == NULL)
2868                 goto errout;
2869
2870         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0, event);
2871         if (err < 0) {
2872                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2873                 WARN_ON(err == -EMSGSIZE);
2874                 kfree_skb(skb);
2875                 goto errout;
2876         }
2877         return skb;
2878 errout:
2879         if (err < 0)
2880                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2881         return NULL;
2882 }
2883
2884 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2885 {
2886         struct net *net = dev_net(dev);
2887
2888         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2889 }
2890
2891 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
2892                                unsigned int change, u32 event,
2893                                gfp_t flags)
2894 {
2895         struct sk_buff *skb;
2896
2897         if (dev->reg_state != NETREG_REGISTERED)
2898                 return;
2899
2900         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags);
2901         if (skb)
2902                 rtmsg_ifinfo_send(skb, dev, flags);
2903 }
2904
2905 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2906                   gfp_t flags)
2907 {
2908         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags);
2909 }
2910 EXPORT_SYMBOL(rtmsg_ifinfo);
2911
2912 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2913                                    struct net_device *dev,
2914                                    u8 *addr, u16 vid, u32 pid, u32 seq,
2915                                    int type, unsigned int flags,
2916                                    int nlflags, u16 ndm_state)
2917 {
2918         struct nlmsghdr *nlh;
2919         struct ndmsg *ndm;
2920
2921         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2922         if (!nlh)
2923                 return -EMSGSIZE;
2924
2925         ndm = nlmsg_data(nlh);
2926         ndm->ndm_family  = AF_BRIDGE;
2927         ndm->ndm_pad1    = 0;
2928         ndm->ndm_pad2    = 0;
2929         ndm->ndm_flags   = flags;
2930         ndm->ndm_type    = 0;
2931         ndm->ndm_ifindex = dev->ifindex;
2932         ndm->ndm_state   = ndm_state;
2933
2934         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2935                 goto nla_put_failure;
2936         if (vid)
2937                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2938                         goto nla_put_failure;
2939
2940         nlmsg_end(skb, nlh);
2941         return 0;
2942
2943 nla_put_failure:
2944         nlmsg_cancel(skb, nlh);
2945         return -EMSGSIZE;
2946 }
2947
2948 static inline size_t rtnl_fdb_nlmsg_size(void)
2949 {
2950         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
2951                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
2952                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
2953                0;
2954 }
2955
2956 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
2957                             u16 ndm_state)
2958 {
2959         struct net *net = dev_net(dev);
2960         struct sk_buff *skb;
2961         int err = -ENOBUFS;
2962
2963         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2964         if (!skb)
2965                 goto errout;
2966
2967         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2968                                       0, 0, type, NTF_SELF, 0, ndm_state);
2969         if (err < 0) {
2970                 kfree_skb(skb);
2971                 goto errout;
2972         }
2973
2974         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2975         return;
2976 errout:
2977         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2978 }
2979
2980 /**
2981  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2982  */
2983 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2984                      struct nlattr *tb[],
2985                      struct net_device *dev,
2986                      const unsigned char *addr, u16 vid,
2987                      u16 flags)
2988 {
2989         int err = -EINVAL;
2990
2991         /* If aging addresses are supported device will need to
2992          * implement its own handler for this.
2993          */
2994         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2995                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2996                 return err;
2997         }
2998
2999         if (vid) {
3000                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3001                 return err;
3002         }
3003
3004         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3005                 err = dev_uc_add_excl(dev, addr);
3006         else if (is_multicast_ether_addr(addr))
3007                 err = dev_mc_add_excl(dev, addr);
3008
3009         /* Only return duplicate errors if NLM_F_EXCL is set */
3010         if (err == -EEXIST && !(flags & NLM_F_EXCL))
3011                 err = 0;
3012
3013         return err;
3014 }
3015 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3016
3017 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
3018 {
3019         u16 vid = 0;
3020
3021         if (vlan_attr) {
3022                 if (nla_len(vlan_attr) != sizeof(u16)) {
3023                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
3024                         return -EINVAL;
3025                 }
3026
3027                 vid = nla_get_u16(vlan_attr);
3028
3029                 if (!vid || vid >= VLAN_VID_MASK) {
3030                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
3031                                 vid);
3032                         return -EINVAL;
3033                 }
3034         }
3035         *p_vid = vid;
3036         return 0;
3037 }
3038
3039 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3040                         struct netlink_ext_ack *extack)
3041 {
3042         struct net *net = sock_net(skb->sk);
3043         struct ndmsg *ndm;
3044         struct nlattr *tb[NDA_MAX+1];
3045         struct net_device *dev;
3046         u8 *addr;
3047         u16 vid;
3048         int err;
3049
3050         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3051         if (err < 0)
3052                 return err;
3053
3054         ndm = nlmsg_data(nlh);
3055         if (ndm->ndm_ifindex == 0) {
3056                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
3057                 return -EINVAL;
3058         }
3059
3060         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3061         if (dev == NULL) {
3062                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
3063                 return -ENODEV;
3064         }
3065
3066         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3067                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
3068                 return -EINVAL;
3069         }
3070
3071         addr = nla_data(tb[NDA_LLADDR]);
3072
3073         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
3074         if (err)
3075                 return err;
3076
3077         err = -EOPNOTSUPP;
3078
3079         /* Support fdb on master device the net/bridge default case */
3080         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3081             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3082                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3083                 const struct net_device_ops *ops = br_dev->netdev_ops;
3084
3085                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3086                                        nlh->nlmsg_flags);
3087                 if (err)
3088                         goto out;
3089                 else
3090                         ndm->ndm_flags &= ~NTF_MASTER;
3091         }
3092
3093         /* Embedded bridge, macvlan, and any other device support */
3094         if ((ndm->ndm_flags & NTF_SELF)) {
3095                 if (dev->netdev_ops->ndo_fdb_add)
3096                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3097                                                            vid,
3098                                                            nlh->nlmsg_flags);
3099                 else
3100                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3101                                                nlh->nlmsg_flags);
3102
3103                 if (!err) {
3104                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3105                                         ndm->ndm_state);
3106                         ndm->ndm_flags &= ~NTF_SELF;
3107                 }
3108         }
3109 out:
3110         return err;
3111 }
3112
3113 /**
3114  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3115  */
3116 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3117                      struct nlattr *tb[],
3118                      struct net_device *dev,
3119                      const unsigned char *addr, u16 vid)
3120 {
3121         int err = -EINVAL;
3122
3123         /* If aging addresses are supported device will need to
3124          * implement its own handler for this.
3125          */
3126         if (!(ndm->ndm_state & NUD_PERMANENT)) {
3127                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3128                 return err;
3129         }
3130
3131         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3132                 err = dev_uc_del(dev, addr);
3133         else if (is_multicast_ether_addr(addr))
3134                 err = dev_mc_del(dev, addr);
3135
3136         return err;
3137 }
3138 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3139
3140 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3141                         struct netlink_ext_ack *extack)
3142 {
3143         struct net *net = sock_net(skb->sk);
3144         struct ndmsg *ndm;
3145         struct nlattr *tb[NDA_MAX+1];
3146         struct net_device *dev;
3147         int err = -EINVAL;
3148         __u8 *addr;
3149         u16 vid;
3150
3151         if (!netlink_capable(skb, CAP_NET_ADMIN))
3152                 return -EPERM;
3153
3154         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3155         if (err < 0)
3156                 return err;
3157
3158         ndm = nlmsg_data(nlh);
3159         if (ndm->ndm_ifindex == 0) {
3160                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
3161                 return -EINVAL;
3162         }
3163
3164         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3165         if (dev == NULL) {
3166                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
3167                 return -ENODEV;
3168         }
3169
3170         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3171                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
3172                 return -EINVAL;
3173         }
3174
3175         addr = nla_data(tb[NDA_LLADDR]);
3176
3177         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
3178         if (err)
3179                 return err;
3180
3181         err = -EOPNOTSUPP;
3182
3183         /* Support fdb on master device the net/bridge default case */
3184         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3185             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3186                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3187                 const struct net_device_ops *ops = br_dev->netdev_ops;
3188
3189                 if (ops->ndo_fdb_del)
3190                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3191
3192                 if (err)
3193                         goto out;
3194                 else
3195                         ndm->ndm_flags &= ~NTF_MASTER;
3196         }
3197
3198         /* Embedded bridge, macvlan, and any other device support */
3199         if (ndm->ndm_flags & NTF_SELF) {
3200                 if (dev->netdev_ops->ndo_fdb_del)
3201                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3202                                                            vid);
3203                 else
3204                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3205
3206                 if (!err) {
3207                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3208                                         ndm->ndm_state);
3209                         ndm->ndm_flags &= ~NTF_SELF;
3210                 }
3211         }
3212 out:
3213         return err;
3214 }
3215
3216 static int nlmsg_populate_fdb(struct sk_buff *skb,
3217                               struct netlink_callback *cb,
3218                               struct net_device *dev,
3219                               int *idx,
3220                               struct netdev_hw_addr_list *list)
3221 {
3222         struct netdev_hw_addr *ha;
3223         int err;
3224         u32 portid, seq;
3225
3226         portid = NETLINK_CB(cb->skb).portid;
3227         seq = cb->nlh->nlmsg_seq;
3228
3229         list_for_each_entry(ha, &list->list, list) {
3230                 if (*idx < cb->args[2])
3231                         goto skip;
3232
3233                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3234                                               portid, seq,
3235                                               RTM_NEWNEIGH, NTF_SELF,
3236                                               NLM_F_MULTI, NUD_PERMANENT);
3237                 if (err < 0)
3238                         return err;
3239 skip:
3240                 *idx += 1;
3241         }
3242         return 0;
3243 }
3244
3245 /**
3246  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3247  * @nlh: netlink message header
3248  * @dev: netdevice
3249  *
3250  * Default netdevice operation to dump the existing unicast address list.
3251  * Returns number of addresses from list put in skb.
3252  */
3253 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3254                       struct netlink_callback *cb,
3255                       struct net_device *dev,
3256                       struct net_device *filter_dev,
3257                       int *idx)
3258 {
3259         int err;
3260
3261         netif_addr_lock_bh(dev);
3262         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3263         if (err)
3264                 goto out;
3265         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3266 out:
3267         netif_addr_unlock_bh(dev);
3268         return err;
3269 }
3270 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3271
3272 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3273 {
3274         struct net_device *dev;
3275         struct nlattr *tb[IFLA_MAX+1];
3276         struct net_device *br_dev = NULL;
3277         const struct net_device_ops *ops = NULL;
3278         const struct net_device_ops *cops = NULL;
3279         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3280         struct net *net = sock_net(skb->sk);
3281         struct hlist_head *head;
3282         int brport_idx = 0;
3283         int br_idx = 0;
3284         int h, s_h;
3285         int idx = 0, s_idx;
3286         int err = 0;
3287         int fidx = 0;
3288
3289         err = nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb,
3290                           IFLA_MAX, ifla_policy, NULL);
3291         if (err < 0) {
3292                 return -EINVAL;
3293         } else if (err == 0) {
3294                 if (tb[IFLA_MASTER])
3295                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
3296         }
3297
3298         brport_idx = ifm->ifi_index;
3299
3300         if (br_idx) {
3301                 br_dev = __dev_get_by_index(net, br_idx);
3302                 if (!br_dev)
3303                         return -ENODEV;
3304
3305                 ops = br_dev->netdev_ops;
3306         }
3307
3308         s_h = cb->args[0];
3309         s_idx = cb->args[1];
3310
3311         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3312                 idx = 0;
3313                 head = &net->dev_index_head[h];
3314                 hlist_for_each_entry(dev, head, index_hlist) {
3315
3316                         if (brport_idx && (dev->ifindex != brport_idx))
3317                                 continue;
3318
3319                         if (!br_idx) { /* user did not specify a specific bridge */
3320                                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3321                                         br_dev = netdev_master_upper_dev_get(dev);
3322                                         cops = br_dev->netdev_ops;
3323                                 }
3324                         } else {
3325                                 if (dev != br_dev &&
3326                                     !(dev->priv_flags & IFF_BRIDGE_PORT))
3327                                         continue;
3328
3329                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
3330                                     !(dev->priv_flags & IFF_EBRIDGE))
3331                                         continue;
3332                                 cops = ops;
3333                         }
3334
3335                         if (idx < s_idx)
3336                                 goto cont;
3337
3338                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
3339                                 if (cops && cops->ndo_fdb_dump) {
3340                                         err = cops->ndo_fdb_dump(skb, cb,
3341                                                                 br_dev, dev,
3342                                                                 &fidx);
3343                                         if (err == -EMSGSIZE)
3344                                                 goto out;
3345                                 }
3346                         }
3347
3348                         if (dev->netdev_ops->ndo_fdb_dump)
3349                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
3350                                                                     dev, NULL,
3351                                                                     &fidx);
3352                         else
3353                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
3354                                                         &fidx);
3355                         if (err == -EMSGSIZE)
3356                                 goto out;
3357
3358                         cops = NULL;
3359
3360                         /* reset fdb offset to 0 for rest of the interfaces */
3361                         cb->args[2] = 0;
3362                         fidx = 0;
3363 cont:
3364                         idx++;
3365                 }
3366         }
3367
3368 out:
3369         cb->args[0] = h;
3370         cb->args[1] = idx;
3371         cb->args[2] = fidx;
3372
3373         return skb->len;
3374 }
3375
3376 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3377                                unsigned int attrnum, unsigned int flag)
3378 {
3379         if (mask & flag)
3380                 return nla_put_u8(skb, attrnum, !!(flags & flag));
3381         return 0;
3382 }
3383
3384 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3385                             struct net_device *dev, u16 mode,
3386                             u32 flags, u32 mask, int nlflags,
3387                             u32 filter_mask,
3388                             int (*vlan_fill)(struct sk_buff *skb,
3389                                              struct net_device *dev,
3390                                              u32 filter_mask))
3391 {
3392         struct nlmsghdr *nlh;
3393         struct ifinfomsg *ifm;
3394         struct nlattr *br_afspec;
3395         struct nlattr *protinfo;
3396         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3397         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3398         int err = 0;
3399
3400         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3401         if (nlh == NULL)
3402                 return -EMSGSIZE;
3403
3404         ifm = nlmsg_data(nlh);
3405         ifm->ifi_family = AF_BRIDGE;
3406         ifm->__ifi_pad = 0;
3407         ifm->ifi_type = dev->type;
3408         ifm->ifi_index = dev->ifindex;
3409         ifm->ifi_flags = dev_get_flags(dev);
3410         ifm->ifi_change = 0;
3411
3412
3413         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3414             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3415             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3416             (br_dev &&
3417              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3418             (dev->addr_len &&
3419              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3420             (dev->ifindex != dev_get_iflink(dev) &&
3421              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3422                 goto nla_put_failure;
3423
3424         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3425         if (!br_afspec)
3426                 goto nla_put_failure;
3427
3428         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3429                 nla_nest_cancel(skb, br_afspec);
3430                 goto nla_put_failure;
3431         }
3432
3433         if (mode != BRIDGE_MODE_UNDEF) {
3434                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3435                         nla_nest_cancel(skb, br_afspec);
3436                         goto nla_put_failure;
3437                 }
3438         }
3439         if (vlan_fill) {
3440                 err = vlan_fill(skb, dev, filter_mask);
3441                 if (err) {
3442                         nla_nest_cancel(skb, br_afspec);
3443                         goto nla_put_failure;
3444                 }
3445         }
3446         nla_nest_end(skb, br_afspec);
3447
3448         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3449         if (!protinfo)
3450                 goto nla_put_failure;
3451
3452         if (brport_nla_put_flag(skb, flags, mask,
3453                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3454             brport_nla_put_flag(skb, flags, mask,
3455                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3456             brport_nla_put_flag(skb, flags, mask,
3457                                 IFLA_BRPORT_FAST_LEAVE,
3458                                 BR_MULTICAST_FAST_LEAVE) ||
3459             brport_nla_put_flag(skb, flags, mask,
3460                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3461             brport_nla_put_flag(skb, flags, mask,
3462                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3463             brport_nla_put_flag(skb, flags, mask,
3464                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3465             brport_nla_put_flag(skb, flags, mask,
3466                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3467             brport_nla_put_flag(skb, flags, mask,
3468                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3469                 nla_nest_cancel(skb, protinfo);
3470                 goto nla_put_failure;
3471         }
3472
3473         nla_nest_end(skb, protinfo);
3474
3475         nlmsg_end(skb, nlh);
3476         return 0;
3477 nla_put_failure:
3478         nlmsg_cancel(skb, nlh);
3479         return err ? err : -EMSGSIZE;
3480 }
3481 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3482
3483 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3484 {
3485         struct net *net = sock_net(skb->sk);
3486         struct net_device *dev;
3487         int idx = 0;
3488         u32 portid = NETLINK_CB(cb->skb).portid;
3489         u32 seq = cb->nlh->nlmsg_seq;
3490         u32 filter_mask = 0;
3491         int err;
3492
3493         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3494                 struct nlattr *extfilt;
3495
3496                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3497                                           IFLA_EXT_MASK);
3498                 if (extfilt) {
3499                         if (nla_len(extfilt) < sizeof(filter_mask))
3500                                 return -EINVAL;
3501
3502                         filter_mask = nla_get_u32(extfilt);
3503                 }
3504         }
3505
3506         rcu_read_lock();
3507         for_each_netdev_rcu(net, dev) {
3508                 const struct net_device_ops *ops = dev->netdev_ops;
3509                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3510
3511                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3512                         if (idx >= cb->args[0]) {
3513                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
3514                                                 skb, portid, seq, dev,
3515                                                 filter_mask, NLM_F_MULTI);
3516                                 if (err < 0 && err != -EOPNOTSUPP) {
3517                                         if (likely(skb->len))
3518                                                 break;
3519
3520                                         goto out_err;
3521                                 }
3522                         }
3523                         idx++;
3524                 }
3525
3526                 if (ops->ndo_bridge_getlink) {
3527                         if (idx >= cb->args[0]) {
3528                                 err = ops->ndo_bridge_getlink(skb, portid,
3529                                                               seq, dev,
3530                                                               filter_mask,
3531                                                               NLM_F_MULTI);
3532                                 if (err < 0 && err != -EOPNOTSUPP) {
3533                                         if (likely(skb->len))
3534                                                 break;
3535
3536                                         goto out_err;
3537                                 }
3538                         }
3539                         idx++;
3540                 }
3541         }
3542         err = skb->len;
3543 out_err:
3544         rcu_read_unlock();
3545         cb->args[0] = idx;
3546
3547         return err;
3548 }
3549
3550 static inline size_t bridge_nlmsg_size(void)
3551 {
3552         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3553                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
3554                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
3555                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
3556                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
3557                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
3558                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
3559                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
3560                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3561                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
3562                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
3563 }
3564
3565 static int rtnl_bridge_notify(struct net_device *dev)
3566 {
3567         struct net *net = dev_net(dev);
3568         struct sk_buff *skb;
3569         int err = -EOPNOTSUPP;
3570
3571         if (!dev->netdev_ops->ndo_bridge_getlink)
3572                 return 0;
3573
3574         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3575         if (!skb) {
3576                 err = -ENOMEM;
3577                 goto errout;
3578         }
3579
3580         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3581         if (err < 0)
3582                 goto errout;
3583
3584         if (!skb->len)
3585                 goto errout;
3586
3587         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3588         return 0;
3589 errout:
3590         WARN_ON(err == -EMSGSIZE);
3591         kfree_skb(skb);
3592         if (err)
3593                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3594         return err;
3595 }
3596
3597 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3598                                struct netlink_ext_ack *extack)
3599 {
3600         struct net *net = sock_net(skb->sk);
3601         struct ifinfomsg *ifm;
3602         struct net_device *dev;
3603         struct nlattr *br_spec, *attr = NULL;
3604         int rem, err = -EOPNOTSUPP;
3605         u16 flags = 0;
3606         bool have_flags = false;
3607
3608         if (nlmsg_len(nlh) < sizeof(*ifm))
3609                 return -EINVAL;
3610
3611         ifm = nlmsg_data(nlh);
3612         if (ifm->ifi_family != AF_BRIDGE)
3613                 return -EPFNOSUPPORT;
3614
3615         dev = __dev_get_by_index(net, ifm->ifi_index);
3616         if (!dev) {
3617                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3618                 return -ENODEV;
3619         }
3620
3621         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3622         if (br_spec) {
3623                 nla_for_each_nested(attr, br_spec, rem) {
3624                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3625                                 if (nla_len(attr) < sizeof(flags))
3626                                         return -EINVAL;
3627
3628                                 have_flags = true;
3629                                 flags = nla_get_u16(attr);
3630                                 break;
3631                         }
3632                 }
3633         }
3634
3635         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3636                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3637
3638                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3639                         err = -EOPNOTSUPP;
3640                         goto out;
3641                 }
3642
3643                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3644                 if (err)
3645                         goto out;
3646
3647                 flags &= ~BRIDGE_FLAGS_MASTER;
3648         }
3649
3650         if ((flags & BRIDGE_FLAGS_SELF)) {
3651                 if (!dev->netdev_ops->ndo_bridge_setlink)
3652                         err = -EOPNOTSUPP;
3653                 else
3654                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3655                                                                   flags);
3656                 if (!err) {
3657                         flags &= ~BRIDGE_FLAGS_SELF;
3658
3659                         /* Generate event to notify upper layer of bridge
3660                          * change
3661                          */
3662                         err = rtnl_bridge_notify(dev);
3663                 }
3664         }
3665
3666         if (have_flags)
3667                 memcpy(nla_data(attr), &flags, sizeof(flags));
3668 out:
3669         return err;
3670 }
3671
3672 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
3673                                struct netlink_ext_ack *extack)
3674 {
3675         struct net *net = sock_net(skb->sk);
3676         struct ifinfomsg *ifm;
3677         struct net_device *dev;
3678         struct nlattr *br_spec, *attr = NULL;
3679         int rem, err = -EOPNOTSUPP;
3680         u16 flags = 0;
3681         bool have_flags = false;
3682
3683         if (nlmsg_len(nlh) < sizeof(*ifm))
3684                 return -EINVAL;
3685
3686         ifm = nlmsg_data(nlh);
3687         if (ifm->ifi_family != AF_BRIDGE)
3688                 return -EPFNOSUPPORT;
3689
3690         dev = __dev_get_by_index(net, ifm->ifi_index);
3691         if (!dev) {
3692                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3693                 return -ENODEV;
3694         }
3695
3696         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3697         if (br_spec) {
3698                 nla_for_each_nested(attr, br_spec, rem) {
3699                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3700                                 if (nla_len(attr) < sizeof(flags))
3701                                         return -EINVAL;
3702
3703                                 have_flags = true;
3704                                 flags = nla_get_u16(attr);
3705                                 break;
3706                         }
3707                 }
3708         }
3709
3710         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3711                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3712
3713                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3714                         err = -EOPNOTSUPP;
3715                         goto out;
3716                 }
3717
3718                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3719                 if (err)
3720                         goto out;
3721
3722                 flags &= ~BRIDGE_FLAGS_MASTER;
3723         }
3724
3725         if ((flags & BRIDGE_FLAGS_SELF)) {
3726                 if (!dev->netdev_ops->ndo_bridge_dellink)
3727                         err = -EOPNOTSUPP;
3728                 else
3729                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3730                                                                   flags);
3731
3732                 if (!err) {
3733                         flags &= ~BRIDGE_FLAGS_SELF;
3734
3735                         /* Generate event to notify upper layer of bridge
3736                          * change
3737                          */
3738                         err = rtnl_bridge_notify(dev);
3739                 }
3740         }
3741
3742         if (have_flags)
3743                 memcpy(nla_data(attr), &flags, sizeof(flags));
3744 out:
3745         return err;
3746 }
3747
3748 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
3749 {
3750         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
3751                (!idxattr || idxattr == attrid);
3752 }
3753
3754 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
3755 static int rtnl_get_offload_stats_attr_size(int attr_id)
3756 {
3757         switch (attr_id) {
3758         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
3759                 return sizeof(struct rtnl_link_stats64);
3760         }
3761
3762         return 0;
3763 }
3764
3765 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
3766                                   int *prividx)
3767 {
3768         struct nlattr *attr = NULL;
3769         int attr_id, size;
3770         void *attr_data;
3771         int err;
3772
3773         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3774               dev->netdev_ops->ndo_get_offload_stats))
3775                 return -ENODATA;
3776
3777         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3778              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3779                 if (attr_id < *prividx)
3780                         continue;
3781
3782                 size = rtnl_get_offload_stats_attr_size(attr_id);
3783                 if (!size)
3784                         continue;
3785
3786                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
3787                         continue;
3788
3789                 attr = nla_reserve_64bit(skb, attr_id, size,
3790                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
3791                 if (!attr)
3792                         goto nla_put_failure;
3793
3794                 attr_data = nla_data(attr);
3795                 memset(attr_data, 0, size);
3796                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
3797                                                              attr_data);
3798                 if (err)
3799                         goto get_offload_stats_failure;
3800         }
3801
3802         if (!attr)
3803                 return -ENODATA;
3804
3805         *prividx = 0;
3806         return 0;
3807
3808 nla_put_failure:
3809         err = -EMSGSIZE;
3810 get_offload_stats_failure:
3811         *prividx = attr_id;
3812         return err;
3813 }
3814
3815 static int rtnl_get_offload_stats_size(const struct net_device *dev)
3816 {
3817         int nla_size = 0;
3818         int attr_id;
3819         int size;
3820
3821         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3822               dev->netdev_ops->ndo_get_offload_stats))
3823                 return 0;
3824
3825         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3826              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3827                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
3828                         continue;
3829                 size = rtnl_get_offload_stats_attr_size(attr_id);
3830                 nla_size += nla_total_size_64bit(size);
3831         }
3832
3833         if (nla_size != 0)
3834                 nla_size += nla_total_size(0);
3835
3836         return nla_size;
3837 }
3838
3839 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
3840                                int type, u32 pid, u32 seq, u32 change,
3841                                unsigned int flags, unsigned int filter_mask,
3842                                int *idxattr, int *prividx)
3843 {
3844         struct if_stats_msg *ifsm;
3845         struct nlmsghdr *nlh;
3846         struct nlattr *attr;
3847         int s_prividx = *prividx;
3848         int err;
3849
3850         ASSERT_RTNL();
3851
3852         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
3853         if (!nlh)
3854                 return -EMSGSIZE;
3855
3856         ifsm = nlmsg_data(nlh);
3857         ifsm->family = PF_UNSPEC;
3858         ifsm->pad1 = 0;
3859         ifsm->pad2 = 0;
3860         ifsm->ifindex = dev->ifindex;
3861         ifsm->filter_mask = filter_mask;
3862
3863         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
3864                 struct rtnl_link_stats64 *sp;
3865
3866                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
3867                                          sizeof(struct rtnl_link_stats64),
3868                                          IFLA_STATS_UNSPEC);
3869                 if (!attr)
3870                         goto nla_put_failure;
3871
3872                 sp = nla_data(attr);
3873                 dev_get_stats(dev, sp);
3874         }
3875
3876         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
3877                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3878
3879                 if (ops && ops->fill_linkxstats) {
3880                         *idxattr = IFLA_STATS_LINK_XSTATS;
3881                         attr = nla_nest_start(skb,
3882                                               IFLA_STATS_LINK_XSTATS);
3883                         if (!attr)
3884                                 goto nla_put_failure;
3885
3886                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3887                         nla_nest_end(skb, attr);
3888                         if (err)
3889                                 goto nla_put_failure;
3890                         *idxattr = 0;
3891                 }
3892         }
3893
3894         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
3895                              *idxattr)) {
3896                 const struct rtnl_link_ops *ops = NULL;
3897                 const struct net_device *master;
3898
3899                 master = netdev_master_upper_dev_get(dev);
3900                 if (master)
3901                         ops = master->rtnl_link_ops;
3902                 if (ops && ops->fill_linkxstats) {
3903                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
3904                         attr = nla_nest_start(skb,
3905                                               IFLA_STATS_LINK_XSTATS_SLAVE);
3906                         if (!attr)
3907                                 goto nla_put_failure;
3908
3909                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3910                         nla_nest_end(skb, attr);
3911                         if (err)
3912                                 goto nla_put_failure;
3913                         *idxattr = 0;
3914                 }
3915         }
3916
3917         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
3918                              *idxattr)) {
3919                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
3920                 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
3921                 if (!attr)
3922                         goto nla_put_failure;
3923
3924                 err = rtnl_get_offload_stats(skb, dev, prividx);
3925                 if (err == -ENODATA)
3926                         nla_nest_cancel(skb, attr);
3927                 else
3928                         nla_nest_end(skb, attr);
3929
3930                 if (err && err != -ENODATA)
3931                         goto nla_put_failure;
3932                 *idxattr = 0;
3933         }
3934
3935         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
3936                 struct rtnl_af_ops *af_ops;
3937
3938                 *idxattr = IFLA_STATS_AF_SPEC;
3939                 attr = nla_nest_start(skb, IFLA_STATS_AF_SPEC);
3940                 if (!attr)
3941                         goto nla_put_failure;
3942
3943                 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
3944                         if (af_ops->fill_stats_af) {
3945                                 struct nlattr *af;
3946                                 int err;
3947
3948                                 af = nla_nest_start(skb, af_ops->family);
3949                                 if (!af)
3950                                         goto nla_put_failure;
3951
3952                                 err = af_ops->fill_stats_af(skb, dev);
3953
3954                                 if (err == -ENODATA)
3955                                         nla_nest_cancel(skb, af);
3956                                 else if (err < 0)
3957                                         goto nla_put_failure;
3958
3959                                 nla_nest_end(skb, af);
3960                         }
3961                 }
3962
3963                 nla_nest_end(skb, attr);
3964
3965                 *idxattr = 0;
3966         }
3967
3968         nlmsg_end(skb, nlh);
3969
3970         return 0;
3971
3972 nla_put_failure:
3973         /* not a multi message or no progress mean a real error */
3974         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
3975                 nlmsg_cancel(skb, nlh);
3976         else
3977                 nlmsg_end(skb, nlh);
3978
3979         return -EMSGSIZE;
3980 }
3981
3982 static size_t if_nlmsg_stats_size(const struct net_device *dev,
3983                                   u32 filter_mask)
3984 {
3985         size_t size = 0;
3986
3987         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
3988                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
3989
3990         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
3991                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3992                 int attr = IFLA_STATS_LINK_XSTATS;
3993
3994                 if (ops && ops->get_linkxstats_size) {
3995                         size += nla_total_size(ops->get_linkxstats_size(dev,
3996                                                                         attr));
3997                         /* for IFLA_STATS_LINK_XSTATS */
3998                         size += nla_total_size(0);
3999                 }
4000         }
4001
4002         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
4003                 struct net_device *_dev = (struct net_device *)dev;
4004                 const struct rtnl_link_ops *ops = NULL;
4005                 const struct net_device *master;
4006
4007                 /* netdev_master_upper_dev_get can't take const */
4008                 master = netdev_master_upper_dev_get(_dev);
4009                 if (master)
4010                         ops = master->rtnl_link_ops;
4011                 if (ops && ops->get_linkxstats_size) {
4012                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
4013
4014                         size += nla_total_size(ops->get_linkxstats_size(dev,
4015                                                                         attr));
4016                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
4017                         size += nla_total_size(0);
4018                 }
4019         }
4020
4021         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
4022                 size += rtnl_get_offload_stats_size(dev);
4023
4024         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
4025                 struct rtnl_af_ops *af_ops;
4026
4027                 /* for IFLA_STATS_AF_SPEC */
4028                 size += nla_total_size(0);
4029
4030                 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
4031                         if (af_ops->get_stats_af_size) {
4032                                 size += nla_total_size(
4033                                         af_ops->get_stats_af_size(dev));
4034
4035                                 /* for AF_* */
4036                                 size += nla_total_size(0);
4037                         }
4038                 }
4039         }
4040
4041         return size;
4042 }
4043
4044 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
4045                           struct netlink_ext_ack *extack)
4046 {
4047         struct net *net = sock_net(skb->sk);
4048         struct net_device *dev = NULL;
4049         int idxattr = 0, prividx = 0;
4050         struct if_stats_msg *ifsm;
4051         struct sk_buff *nskb;
4052         u32 filter_mask;
4053         int err;
4054
4055         if (nlmsg_len(nlh) < sizeof(*ifsm))
4056                 return -EINVAL;
4057
4058         ifsm = nlmsg_data(nlh);
4059         if (ifsm->ifindex > 0)
4060                 dev = __dev_get_by_index(net, ifsm->ifindex);
4061         else
4062                 return -EINVAL;
4063
4064         if (!dev)
4065                 return -ENODEV;
4066
4067         filter_mask = ifsm->filter_mask;
4068         if (!filter_mask)
4069                 return -EINVAL;
4070
4071         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
4072         if (!nskb)
4073                 return -ENOBUFS;
4074
4075         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
4076                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
4077                                   0, filter_mask, &idxattr, &prividx);
4078         if (err < 0) {
4079                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
4080                 WARN_ON(err == -EMSGSIZE);
4081                 kfree_skb(nskb);
4082         } else {
4083                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
4084         }
4085
4086         return err;
4087 }
4088
4089 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
4090 {
4091         int h, s_h, err, s_idx, s_idxattr, s_prividx;
4092         struct net *net = sock_net(skb->sk);
4093         unsigned int flags = NLM_F_MULTI;
4094         struct if_stats_msg *ifsm;
4095         struct hlist_head *head;
4096         struct net_device *dev;
4097         u32 filter_mask = 0;
4098         int idx = 0;
4099
4100         s_h = cb->args[0];
4101         s_idx = cb->args[1];
4102         s_idxattr = cb->args[2];
4103         s_prividx = cb->args[3];
4104
4105         cb->seq = net->dev_base_seq;
4106
4107         if (nlmsg_len(cb->nlh) < sizeof(*ifsm))
4108                 return -EINVAL;
4109
4110         ifsm = nlmsg_data(cb->nlh);
4111         filter_mask = ifsm->filter_mask;
4112         if (!filter_mask)
4113                 return -EINVAL;
4114
4115         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4116                 idx = 0;
4117                 head = &net->dev_index_head[h];
4118                 hlist_for_each_entry(dev, head, index_hlist) {
4119                         if (idx < s_idx)
4120                                 goto cont;
4121                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
4122                                                   NETLINK_CB(cb->skb).portid,
4123                                                   cb->nlh->nlmsg_seq, 0,
4124                                                   flags, filter_mask,
4125                                                   &s_idxattr, &s_prividx);
4126                         /* If we ran out of room on the first message,
4127                          * we're in trouble
4128                          */
4129                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
4130
4131                         if (err < 0)
4132                                 goto out;
4133                         s_prividx = 0;
4134                         s_idxattr = 0;
4135                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4136 cont:
4137                         idx++;
4138                 }
4139         }
4140 out:
4141         cb->args[3] = s_prividx;
4142         cb->args[2] = s_idxattr;
4143         cb->args[1] = idx;
4144         cb->args[0] = h;
4145
4146         return skb->len;
4147 }
4148
4149 /* Process one rtnetlink message. */
4150
4151 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
4152                              struct netlink_ext_ack *extack)
4153 {
4154         struct net *net = sock_net(skb->sk);
4155         struct rtnl_link *handlers;
4156         int err = -EOPNOTSUPP;
4157         rtnl_doit_func doit;
4158         unsigned int flags;
4159         int kind;
4160         int family;
4161         int type;
4162
4163         type = nlh->nlmsg_type;
4164         if (type > RTM_MAX)
4165                 return -EOPNOTSUPP;
4166
4167         type -= RTM_BASE;
4168
4169         /* All the messages must have at least 1 byte length */
4170         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
4171                 return 0;
4172
4173         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
4174         kind = type&3;
4175
4176         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
4177                 return -EPERM;
4178
4179         if (family >= ARRAY_SIZE(rtnl_msg_handlers))
4180                 family = PF_UNSPEC;
4181
4182         rcu_read_lock();
4183         handlers = rcu_dereference(rtnl_msg_handlers[family]);
4184         if (!handlers) {
4185                 family = PF_UNSPEC;
4186                 handlers = rcu_dereference(rtnl_msg_handlers[family]);
4187         }
4188
4189         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
4190                 struct sock *rtnl;
4191                 rtnl_dumpit_func dumpit;
4192                 u16 min_dump_alloc = 0;
4193
4194                 dumpit = READ_ONCE(handlers[type].dumpit);
4195                 if (!dumpit) {
4196                         family = PF_UNSPEC;
4197                         handlers = rcu_dereference(rtnl_msg_handlers[PF_UNSPEC]);
4198                         if (!handlers)
4199                                 goto err_unlock;
4200
4201                         dumpit = READ_ONCE(handlers[type].dumpit);
4202                         if (!dumpit)
4203                                 goto err_unlock;
4204                 }
4205
4206                 refcount_inc(&rtnl_msg_handlers_ref[family]);
4207
4208                 if (type == RTM_GETLINK - RTM_BASE)
4209                         min_dump_alloc = rtnl_calcit(skb, nlh);
4210
4211                 rcu_read_unlock();
4212
4213                 rtnl = net->rtnl;
4214                 {
4215                         struct netlink_dump_control c = {
4216                                 .dump           = dumpit,
4217                                 .min_dump_alloc = min_dump_alloc,
4218                         };
4219                         err = netlink_dump_start(rtnl, skb, nlh, &c);
4220                 }
4221                 refcount_dec(&rtnl_msg_handlers_ref[family]);
4222                 return err;
4223         }
4224
4225         doit = READ_ONCE(handlers[type].doit);
4226         if (!doit) {
4227                 family = PF_UNSPEC;
4228                 handlers = rcu_dereference(rtnl_msg_handlers[family]);
4229         }
4230
4231         flags = READ_ONCE(handlers[type].flags);
4232         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
4233                 refcount_inc(&rtnl_msg_handlers_ref[family]);
4234                 doit = READ_ONCE(handlers[type].doit);
4235                 rcu_read_unlock();
4236                 if (doit)
4237                         err = doit(skb, nlh, extack);
4238                 refcount_dec(&rtnl_msg_handlers_ref[family]);
4239                 return err;
4240         }
4241
4242         rcu_read_unlock();
4243
4244         rtnl_lock();
4245         handlers = rtnl_dereference(rtnl_msg_handlers[family]);
4246         if (handlers) {
4247                 doit = READ_ONCE(handlers[type].doit);
4248                 if (doit)
4249                         err = doit(skb, nlh, extack);
4250         }
4251         rtnl_unlock();
4252         return err;
4253
4254 err_unlock:
4255         rcu_read_unlock();
4256         return -EOPNOTSUPP;
4257 }
4258
4259 static void rtnetlink_rcv(struct sk_buff *skb)
4260 {
4261         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
4262 }
4263
4264 static int rtnetlink_bind(struct net *net, int group)
4265 {
4266         switch (group) {
4267         case RTNLGRP_IPV4_MROUTE_R:
4268         case RTNLGRP_IPV6_MROUTE_R:
4269                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4270                         return -EPERM;
4271                 break;
4272         }
4273         return 0;
4274 }
4275
4276 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
4277 {
4278         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4279
4280         switch (event) {
4281         case NETDEV_REBOOT:
4282         case NETDEV_CHANGEMTU:
4283         case NETDEV_CHANGEADDR:
4284         case NETDEV_CHANGENAME:
4285         case NETDEV_FEAT_CHANGE:
4286         case NETDEV_BONDING_FAILOVER:
4287         case NETDEV_POST_TYPE_CHANGE:
4288         case NETDEV_NOTIFY_PEERS:
4289         case NETDEV_CHANGEUPPER:
4290         case NETDEV_RESEND_IGMP:
4291         case NETDEV_CHANGEINFODATA:
4292         case NETDEV_CHANGE_TX_QUEUE_LEN:
4293                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
4294                                    GFP_KERNEL);
4295                 break;
4296         default:
4297                 break;
4298         }
4299         return NOTIFY_DONE;
4300 }
4301
4302 static struct notifier_block rtnetlink_dev_notifier = {
4303         .notifier_call  = rtnetlink_event,
4304 };
4305
4306
4307 static int __net_init rtnetlink_net_init(struct net *net)
4308 {
4309         struct sock *sk;
4310         struct netlink_kernel_cfg cfg = {
4311                 .groups         = RTNLGRP_MAX,
4312                 .input          = rtnetlink_rcv,
4313                 .cb_mutex       = &rtnl_mutex,
4314                 .flags          = NL_CFG_F_NONROOT_RECV,
4315                 .bind           = rtnetlink_bind,
4316         };
4317
4318         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
4319         if (!sk)
4320                 return -ENOMEM;
4321         net->rtnl = sk;
4322         return 0;
4323 }
4324
4325 static void __net_exit rtnetlink_net_exit(struct net *net)
4326 {
4327         netlink_kernel_release(net->rtnl);
4328         net->rtnl = NULL;
4329 }
4330
4331 static struct pernet_operations rtnetlink_net_ops = {
4332         .init = rtnetlink_net_init,
4333         .exit = rtnetlink_net_exit,
4334 };
4335
4336 void __init rtnetlink_init(void)
4337 {
4338         int i;
4339
4340         for (i = 0; i < ARRAY_SIZE(rtnl_msg_handlers_ref); i++)
4341                 refcount_set(&rtnl_msg_handlers_ref[i], 1);
4342
4343         if (register_pernet_subsys(&rtnetlink_net_ops))
4344                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
4345
4346         register_netdevice_notifier(&rtnetlink_dev_notifier);
4347
4348         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
4349                       rtnl_dump_ifinfo, 0);
4350         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
4351         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
4352         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
4353
4354         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
4355         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
4356         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
4357
4358         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
4359         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
4360         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, 0);
4361
4362         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
4363         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
4364         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
4365
4366         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
4367                       0);
4368 }