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 is a string, but policy is set to NLA_BINARY to
1487          * allow 0-length string (needed to remove an alias).
1488          */
1489         [IFLA_IFALIAS]          = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1490         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1491         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1492         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1493         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1494         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1495         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1496         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1497         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1498         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1499         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1500         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1501         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1502         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1503         [IFLA_XDP]              = { .type = NLA_NESTED },
1504         [IFLA_EVENT]            = { .type = NLA_U32 },
1505         [IFLA_GROUP]            = { .type = NLA_U32 },
1506 };
1507
1508 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1509         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1510         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1511         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1512         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1513 };
1514
1515 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1516         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1517         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1518         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1519         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1520         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1521         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1522         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1523         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1524         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1525         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1526         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1527         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1528 };
1529
1530 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1531         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1532         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1533                                     .len = PORT_PROFILE_MAX },
1534         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1535                                       .len = PORT_UUID_MAX },
1536         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1537                                     .len = PORT_UUID_MAX },
1538         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1539         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1540
1541         /* Unused, but we need to keep it here since user space could
1542          * fill it. It's also broken with regard to NLA_BINARY use in
1543          * combination with structs.
1544          */
1545         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1546                                     .len = sizeof(struct ifla_port_vsi) },
1547 };
1548
1549 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1550         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1551         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1552         [IFLA_XDP_FLAGS]        = { .type = NLA_U32 },
1553         [IFLA_XDP_PROG_ID]      = { .type = NLA_U32 },
1554 };
1555
1556 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1557 {
1558         const struct rtnl_link_ops *ops = NULL;
1559         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1560
1561         if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla,
1562                              ifla_info_policy, NULL) < 0)
1563                 return NULL;
1564
1565         if (linfo[IFLA_INFO_KIND]) {
1566                 char kind[MODULE_NAME_LEN];
1567
1568                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1569                 ops = rtnl_link_ops_get(kind);
1570         }
1571
1572         return ops;
1573 }
1574
1575 static bool link_master_filtered(struct net_device *dev, int master_idx)
1576 {
1577         struct net_device *master;
1578
1579         if (!master_idx)
1580                 return false;
1581
1582         master = netdev_master_upper_dev_get(dev);
1583         if (!master || master->ifindex != master_idx)
1584                 return true;
1585
1586         return false;
1587 }
1588
1589 static bool link_kind_filtered(const struct net_device *dev,
1590                                const struct rtnl_link_ops *kind_ops)
1591 {
1592         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1593                 return true;
1594
1595         return false;
1596 }
1597
1598 static bool link_dump_filtered(struct net_device *dev,
1599                                int master_idx,
1600                                const struct rtnl_link_ops *kind_ops)
1601 {
1602         if (link_master_filtered(dev, master_idx) ||
1603             link_kind_filtered(dev, kind_ops))
1604                 return true;
1605
1606         return false;
1607 }
1608
1609 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1610 {
1611         struct net *net = sock_net(skb->sk);
1612         int h, s_h;
1613         int idx = 0, s_idx;
1614         struct net_device *dev;
1615         struct hlist_head *head;
1616         struct nlattr *tb[IFLA_MAX+1];
1617         u32 ext_filter_mask = 0;
1618         const struct rtnl_link_ops *kind_ops = NULL;
1619         unsigned int flags = NLM_F_MULTI;
1620         int master_idx = 0;
1621         int err;
1622         int hdrlen;
1623
1624         s_h = cb->args[0];
1625         s_idx = cb->args[1];
1626
1627         /* A hack to preserve kernel<->userspace interface.
1628          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1629          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1630          * what iproute2 < v3.9.0 used.
1631          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1632          * attribute, its netlink message is shorter than struct ifinfomsg.
1633          */
1634         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1635                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1636
1637         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX,
1638                         ifla_policy, NULL) >= 0) {
1639                 if (tb[IFLA_EXT_MASK])
1640                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1641
1642                 if (tb[IFLA_MASTER])
1643                         master_idx = nla_get_u32(tb[IFLA_MASTER]);
1644
1645                 if (tb[IFLA_LINKINFO])
1646                         kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1647
1648                 if (master_idx || kind_ops)
1649                         flags |= NLM_F_DUMP_FILTERED;
1650         }
1651
1652         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1653                 idx = 0;
1654                 head = &net->dev_index_head[h];
1655                 hlist_for_each_entry(dev, head, index_hlist) {
1656                         if (link_dump_filtered(dev, master_idx, kind_ops))
1657                                 goto cont;
1658                         if (idx < s_idx)
1659                                 goto cont;
1660                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1661                                                NETLINK_CB(cb->skb).portid,
1662                                                cb->nlh->nlmsg_seq, 0,
1663                                                flags,
1664                                                ext_filter_mask, 0);
1665
1666                         if (err < 0) {
1667                                 if (likely(skb->len))
1668                                         goto out;
1669
1670                                 goto out_err;
1671                         }
1672 cont:
1673                         idx++;
1674                 }
1675         }
1676 out:
1677         err = skb->len;
1678 out_err:
1679         cb->args[1] = idx;
1680         cb->args[0] = h;
1681         cb->seq = net->dev_base_seq;
1682         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1683
1684         return err;
1685 }
1686
1687 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
1688                         struct netlink_ext_ack *exterr)
1689 {
1690         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy, exterr);
1691 }
1692 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1693
1694 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1695 {
1696         struct net *net;
1697         /* Examine the link attributes and figure out which
1698          * network namespace we are talking about.
1699          */
1700         if (tb[IFLA_NET_NS_PID])
1701                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1702         else if (tb[IFLA_NET_NS_FD])
1703                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1704         else
1705                 net = get_net(src_net);
1706         return net;
1707 }
1708 EXPORT_SYMBOL(rtnl_link_get_net);
1709
1710 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1711 {
1712         if (dev) {
1713                 if (tb[IFLA_ADDRESS] &&
1714                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1715                         return -EINVAL;
1716
1717                 if (tb[IFLA_BROADCAST] &&
1718                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1719                         return -EINVAL;
1720         }
1721
1722         if (tb[IFLA_AF_SPEC]) {
1723                 struct nlattr *af;
1724                 int rem, err;
1725
1726                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1727                         const struct rtnl_af_ops *af_ops;
1728
1729                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1730                                 return -EAFNOSUPPORT;
1731
1732                         if (!af_ops->set_link_af)
1733                                 return -EOPNOTSUPP;
1734
1735                         if (af_ops->validate_link_af) {
1736                                 err = af_ops->validate_link_af(dev, af);
1737                                 if (err < 0)
1738                                         return err;
1739                         }
1740                 }
1741         }
1742
1743         return 0;
1744 }
1745
1746 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
1747                                   int guid_type)
1748 {
1749         const struct net_device_ops *ops = dev->netdev_ops;
1750
1751         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
1752 }
1753
1754 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
1755 {
1756         if (dev->type != ARPHRD_INFINIBAND)
1757                 return -EOPNOTSUPP;
1758
1759         return handle_infiniband_guid(dev, ivt, guid_type);
1760 }
1761
1762 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1763 {
1764         const struct net_device_ops *ops = dev->netdev_ops;
1765         int err = -EINVAL;
1766
1767         if (tb[IFLA_VF_MAC]) {
1768                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1769
1770                 err = -EOPNOTSUPP;
1771                 if (ops->ndo_set_vf_mac)
1772                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
1773                                                   ivm->mac);
1774                 if (err < 0)
1775                         return err;
1776         }
1777
1778         if (tb[IFLA_VF_VLAN]) {
1779                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1780
1781                 err = -EOPNOTSUPP;
1782                 if (ops->ndo_set_vf_vlan)
1783                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1784                                                    ivv->qos,
1785                                                    htons(ETH_P_8021Q));
1786                 if (err < 0)
1787                         return err;
1788         }
1789
1790         if (tb[IFLA_VF_VLAN_LIST]) {
1791                 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
1792                 struct nlattr *attr;
1793                 int rem, len = 0;
1794
1795                 err = -EOPNOTSUPP;
1796                 if (!ops->ndo_set_vf_vlan)
1797                         return err;
1798
1799                 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
1800                         if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
1801                             nla_len(attr) < NLA_HDRLEN) {
1802                                 return -EINVAL;
1803                         }
1804                         if (len >= MAX_VLAN_LIST_LEN)
1805                                 return -EOPNOTSUPP;
1806                         ivvl[len] = nla_data(attr);
1807
1808                         len++;
1809                 }
1810                 if (len == 0)
1811                         return -EINVAL;
1812
1813                 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
1814                                            ivvl[0]->qos, ivvl[0]->vlan_proto);
1815                 if (err < 0)
1816                         return err;
1817         }
1818
1819         if (tb[IFLA_VF_TX_RATE]) {
1820                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1821                 struct ifla_vf_info ivf;
1822
1823                 err = -EOPNOTSUPP;
1824                 if (ops->ndo_get_vf_config)
1825                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1826                 if (err < 0)
1827                         return err;
1828
1829                 err = -EOPNOTSUPP;
1830                 if (ops->ndo_set_vf_rate)
1831                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1832                                                    ivf.min_tx_rate,
1833                                                    ivt->rate);
1834                 if (err < 0)
1835                         return err;
1836         }
1837
1838         if (tb[IFLA_VF_RATE]) {
1839                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1840
1841                 err = -EOPNOTSUPP;
1842                 if (ops->ndo_set_vf_rate)
1843                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1844                                                    ivt->min_tx_rate,
1845                                                    ivt->max_tx_rate);
1846                 if (err < 0)
1847                         return err;
1848         }
1849
1850         if (tb[IFLA_VF_SPOOFCHK]) {
1851                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1852
1853                 err = -EOPNOTSUPP;
1854                 if (ops->ndo_set_vf_spoofchk)
1855                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1856                                                        ivs->setting);
1857                 if (err < 0)
1858                         return err;
1859         }
1860
1861         if (tb[IFLA_VF_LINK_STATE]) {
1862                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1863
1864                 err = -EOPNOTSUPP;
1865                 if (ops->ndo_set_vf_link_state)
1866                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1867                                                          ivl->link_state);
1868                 if (err < 0)
1869                         return err;
1870         }
1871
1872         if (tb[IFLA_VF_RSS_QUERY_EN]) {
1873                 struct ifla_vf_rss_query_en *ivrssq_en;
1874
1875                 err = -EOPNOTSUPP;
1876                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1877                 if (ops->ndo_set_vf_rss_query_en)
1878                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1879                                                            ivrssq_en->setting);
1880                 if (err < 0)
1881                         return err;
1882         }
1883
1884         if (tb[IFLA_VF_TRUST]) {
1885                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1886
1887                 err = -EOPNOTSUPP;
1888                 if (ops->ndo_set_vf_trust)
1889                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1890                 if (err < 0)
1891                         return err;
1892         }
1893
1894         if (tb[IFLA_VF_IB_NODE_GUID]) {
1895                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
1896
1897                 if (!ops->ndo_set_vf_guid)
1898                         return -EOPNOTSUPP;
1899
1900                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
1901         }
1902
1903         if (tb[IFLA_VF_IB_PORT_GUID]) {
1904                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
1905
1906                 if (!ops->ndo_set_vf_guid)
1907                         return -EOPNOTSUPP;
1908
1909                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
1910         }
1911
1912         return err;
1913 }
1914
1915 static int do_set_master(struct net_device *dev, int ifindex)
1916 {
1917         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1918         const struct net_device_ops *ops;
1919         int err;
1920
1921         if (upper_dev) {
1922                 if (upper_dev->ifindex == ifindex)
1923                         return 0;
1924                 ops = upper_dev->netdev_ops;
1925                 if (ops->ndo_del_slave) {
1926                         err = ops->ndo_del_slave(upper_dev, dev);
1927                         if (err)
1928                                 return err;
1929                 } else {
1930                         return -EOPNOTSUPP;
1931                 }
1932         }
1933
1934         if (ifindex) {
1935                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1936                 if (!upper_dev)
1937                         return -EINVAL;
1938                 ops = upper_dev->netdev_ops;
1939                 if (ops->ndo_add_slave) {
1940                         err = ops->ndo_add_slave(upper_dev, dev);
1941                         if (err)
1942                                 return err;
1943                 } else {
1944                         return -EOPNOTSUPP;
1945                 }
1946         }
1947         return 0;
1948 }
1949
1950 #define DO_SETLINK_MODIFIED     0x01
1951 /* notify flag means notify + modified. */
1952 #define DO_SETLINK_NOTIFY       0x03
1953 static int do_setlink(const struct sk_buff *skb,
1954                       struct net_device *dev, struct ifinfomsg *ifm,
1955                       struct netlink_ext_ack *extack,
1956                       struct nlattr **tb, char *ifname, int status)
1957 {
1958         const struct net_device_ops *ops = dev->netdev_ops;
1959         int err;
1960
1961         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1962                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1963                 if (IS_ERR(net)) {
1964                         err = PTR_ERR(net);
1965                         goto errout;
1966                 }
1967                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1968                         put_net(net);
1969                         err = -EPERM;
1970                         goto errout;
1971                 }
1972                 err = dev_change_net_namespace(dev, net, ifname);
1973                 put_net(net);
1974                 if (err)
1975                         goto errout;
1976                 status |= DO_SETLINK_MODIFIED;
1977         }
1978
1979         if (tb[IFLA_MAP]) {
1980                 struct rtnl_link_ifmap *u_map;
1981                 struct ifmap k_map;
1982
1983                 if (!ops->ndo_set_config) {
1984                         err = -EOPNOTSUPP;
1985                         goto errout;
1986                 }
1987
1988                 if (!netif_device_present(dev)) {
1989                         err = -ENODEV;
1990                         goto errout;
1991                 }
1992
1993                 u_map = nla_data(tb[IFLA_MAP]);
1994                 k_map.mem_start = (unsigned long) u_map->mem_start;
1995                 k_map.mem_end = (unsigned long) u_map->mem_end;
1996                 k_map.base_addr = (unsigned short) u_map->base_addr;
1997                 k_map.irq = (unsigned char) u_map->irq;
1998                 k_map.dma = (unsigned char) u_map->dma;
1999                 k_map.port = (unsigned char) u_map->port;
2000
2001                 err = ops->ndo_set_config(dev, &k_map);
2002                 if (err < 0)
2003                         goto errout;
2004
2005                 status |= DO_SETLINK_NOTIFY;
2006         }
2007
2008         if (tb[IFLA_ADDRESS]) {
2009                 struct sockaddr *sa;
2010                 int len;
2011
2012                 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2013                                                   sizeof(*sa));
2014                 sa = kmalloc(len, GFP_KERNEL);
2015                 if (!sa) {
2016                         err = -ENOMEM;
2017                         goto errout;
2018                 }
2019                 sa->sa_family = dev->type;
2020                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2021                        dev->addr_len);
2022                 err = dev_set_mac_address(dev, sa);
2023                 kfree(sa);
2024                 if (err)
2025                         goto errout;
2026                 status |= DO_SETLINK_MODIFIED;
2027         }
2028
2029         if (tb[IFLA_MTU]) {
2030                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2031                 if (err < 0)
2032                         goto errout;
2033                 status |= DO_SETLINK_MODIFIED;
2034         }
2035
2036         if (tb[IFLA_GROUP]) {
2037                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2038                 status |= DO_SETLINK_NOTIFY;
2039         }
2040
2041         /*
2042          * Interface selected by interface index but interface
2043          * name provided implies that a name change has been
2044          * requested.
2045          */
2046         if (ifm->ifi_index > 0 && ifname[0]) {
2047                 err = dev_change_name(dev, ifname);
2048                 if (err < 0)
2049                         goto errout;
2050                 status |= DO_SETLINK_MODIFIED;
2051         }
2052
2053         if (tb[IFLA_IFALIAS]) {
2054                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2055                                     nla_len(tb[IFLA_IFALIAS]));
2056                 if (err < 0)
2057                         goto errout;
2058                 status |= DO_SETLINK_NOTIFY;
2059         }
2060
2061         if (tb[IFLA_BROADCAST]) {
2062                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2063                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2064         }
2065
2066         if (ifm->ifi_flags || ifm->ifi_change) {
2067                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2068                 if (err < 0)
2069                         goto errout;
2070         }
2071
2072         if (tb[IFLA_MASTER]) {
2073                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
2074                 if (err)
2075                         goto errout;
2076                 status |= DO_SETLINK_MODIFIED;
2077         }
2078
2079         if (tb[IFLA_CARRIER]) {
2080                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2081                 if (err)
2082                         goto errout;
2083                 status |= DO_SETLINK_MODIFIED;
2084         }
2085
2086         if (tb[IFLA_TXQLEN]) {
2087                 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2088                 unsigned int orig_len = dev->tx_queue_len;
2089
2090                 if (dev->tx_queue_len ^ value) {
2091                         dev->tx_queue_len = value;
2092                         err = call_netdevice_notifiers(
2093                               NETDEV_CHANGE_TX_QUEUE_LEN, dev);
2094                         err = notifier_to_errno(err);
2095                         if (err) {
2096                                 dev->tx_queue_len = orig_len;
2097                                 goto errout;
2098                         }
2099                         status |= DO_SETLINK_MODIFIED;
2100                 }
2101         }
2102
2103         if (tb[IFLA_OPERSTATE])
2104                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2105
2106         if (tb[IFLA_LINKMODE]) {
2107                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2108
2109                 write_lock_bh(&dev_base_lock);
2110                 if (dev->link_mode ^ value)
2111                         status |= DO_SETLINK_NOTIFY;
2112                 dev->link_mode = value;
2113                 write_unlock_bh(&dev_base_lock);
2114         }
2115
2116         if (tb[IFLA_VFINFO_LIST]) {
2117                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2118                 struct nlattr *attr;
2119                 int rem;
2120
2121                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2122                         if (nla_type(attr) != IFLA_VF_INFO ||
2123                             nla_len(attr) < NLA_HDRLEN) {
2124                                 err = -EINVAL;
2125                                 goto errout;
2126                         }
2127                         err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2128                                                ifla_vf_policy, NULL);
2129                         if (err < 0)
2130                                 goto errout;
2131                         err = do_setvfinfo(dev, vfinfo);
2132                         if (err < 0)
2133                                 goto errout;
2134                         status |= DO_SETLINK_NOTIFY;
2135                 }
2136         }
2137         err = 0;
2138
2139         if (tb[IFLA_VF_PORTS]) {
2140                 struct nlattr *port[IFLA_PORT_MAX+1];
2141                 struct nlattr *attr;
2142                 int vf;
2143                 int rem;
2144
2145                 err = -EOPNOTSUPP;
2146                 if (!ops->ndo_set_vf_port)
2147                         goto errout;
2148
2149                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2150                         if (nla_type(attr) != IFLA_VF_PORT ||
2151                             nla_len(attr) < NLA_HDRLEN) {
2152                                 err = -EINVAL;
2153                                 goto errout;
2154                         }
2155                         err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2156                                                ifla_port_policy, NULL);
2157                         if (err < 0)
2158                                 goto errout;
2159                         if (!port[IFLA_PORT_VF]) {
2160                                 err = -EOPNOTSUPP;
2161                                 goto errout;
2162                         }
2163                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2164                         err = ops->ndo_set_vf_port(dev, vf, port);
2165                         if (err < 0)
2166                                 goto errout;
2167                         status |= DO_SETLINK_NOTIFY;
2168                 }
2169         }
2170         err = 0;
2171
2172         if (tb[IFLA_PORT_SELF]) {
2173                 struct nlattr *port[IFLA_PORT_MAX+1];
2174
2175                 err = nla_parse_nested(port, IFLA_PORT_MAX,
2176                                        tb[IFLA_PORT_SELF], ifla_port_policy,
2177                                        NULL);
2178                 if (err < 0)
2179                         goto errout;
2180
2181                 err = -EOPNOTSUPP;
2182                 if (ops->ndo_set_vf_port)
2183                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2184                 if (err < 0)
2185                         goto errout;
2186                 status |= DO_SETLINK_NOTIFY;
2187         }
2188
2189         if (tb[IFLA_AF_SPEC]) {
2190                 struct nlattr *af;
2191                 int rem;
2192
2193                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2194                         const struct rtnl_af_ops *af_ops;
2195
2196                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
2197                                 BUG();
2198
2199                         err = af_ops->set_link_af(dev, af);
2200                         if (err < 0)
2201                                 goto errout;
2202
2203                         status |= DO_SETLINK_NOTIFY;
2204                 }
2205         }
2206         err = 0;
2207
2208         if (tb[IFLA_PROTO_DOWN]) {
2209                 err = dev_change_proto_down(dev,
2210                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2211                 if (err)
2212                         goto errout;
2213                 status |= DO_SETLINK_NOTIFY;
2214         }
2215
2216         if (tb[IFLA_XDP]) {
2217                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2218                 u32 xdp_flags = 0;
2219
2220                 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2221                                        ifla_xdp_policy, NULL);
2222                 if (err < 0)
2223                         goto errout;
2224
2225                 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2226                         err = -EINVAL;
2227                         goto errout;
2228                 }
2229
2230                 if (xdp[IFLA_XDP_FLAGS]) {
2231                         xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2232                         if (xdp_flags & ~XDP_FLAGS_MASK) {
2233                                 err = -EINVAL;
2234                                 goto errout;
2235                         }
2236                         if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2237                                 err = -EINVAL;
2238                                 goto errout;
2239                         }
2240                 }
2241
2242                 if (xdp[IFLA_XDP_FD]) {
2243                         err = dev_change_xdp_fd(dev, extack,
2244                                                 nla_get_s32(xdp[IFLA_XDP_FD]),
2245                                                 xdp_flags);
2246                         if (err)
2247                                 goto errout;
2248                         status |= DO_SETLINK_NOTIFY;
2249                 }
2250         }
2251
2252 errout:
2253         if (status & DO_SETLINK_MODIFIED) {
2254                 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2255                         netdev_state_change(dev);
2256
2257                 if (err < 0)
2258                         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",
2259                                              dev->name);
2260         }
2261
2262         return err;
2263 }
2264
2265 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2266                         struct netlink_ext_ack *extack)
2267 {
2268         struct net *net = sock_net(skb->sk);
2269         struct ifinfomsg *ifm;
2270         struct net_device *dev;
2271         int err;
2272         struct nlattr *tb[IFLA_MAX+1];
2273         char ifname[IFNAMSIZ];
2274
2275         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy,
2276                           extack);
2277         if (err < 0)
2278                 goto errout;
2279
2280         if (tb[IFLA_IFNAME])
2281                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2282         else
2283                 ifname[0] = '\0';
2284
2285         err = -EINVAL;
2286         ifm = nlmsg_data(nlh);
2287         if (ifm->ifi_index > 0)
2288                 dev = __dev_get_by_index(net, ifm->ifi_index);
2289         else if (tb[IFLA_IFNAME])
2290                 dev = __dev_get_by_name(net, ifname);
2291         else
2292                 goto errout;
2293
2294         if (dev == NULL) {
2295                 err = -ENODEV;
2296                 goto errout;
2297         }
2298
2299         err = validate_linkmsg(dev, tb);
2300         if (err < 0)
2301                 goto errout;
2302
2303         err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2304 errout:
2305         return err;
2306 }
2307
2308 static int rtnl_group_dellink(const struct net *net, int group)
2309 {
2310         struct net_device *dev, *aux;
2311         LIST_HEAD(list_kill);
2312         bool found = false;
2313
2314         if (!group)
2315                 return -EPERM;
2316
2317         for_each_netdev(net, dev) {
2318                 if (dev->group == group) {
2319                         const struct rtnl_link_ops *ops;
2320
2321                         found = true;
2322                         ops = dev->rtnl_link_ops;
2323                         if (!ops || !ops->dellink)
2324                                 return -EOPNOTSUPP;
2325                 }
2326         }
2327
2328         if (!found)
2329                 return -ENODEV;
2330
2331         for_each_netdev_safe(net, dev, aux) {
2332                 if (dev->group == group) {
2333                         const struct rtnl_link_ops *ops;
2334
2335                         ops = dev->rtnl_link_ops;
2336                         ops->dellink(dev, &list_kill);
2337                 }
2338         }
2339         unregister_netdevice_many(&list_kill);
2340
2341         return 0;
2342 }
2343
2344 int rtnl_delete_link(struct net_device *dev)
2345 {
2346         const struct rtnl_link_ops *ops;
2347         LIST_HEAD(list_kill);
2348
2349         ops = dev->rtnl_link_ops;
2350         if (!ops || !ops->dellink)
2351                 return -EOPNOTSUPP;
2352
2353         ops->dellink(dev, &list_kill);
2354         unregister_netdevice_many(&list_kill);
2355
2356         return 0;
2357 }
2358 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2359
2360 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2361                         struct netlink_ext_ack *extack)
2362 {
2363         struct net *net = sock_net(skb->sk);
2364         struct net_device *dev;
2365         struct ifinfomsg *ifm;
2366         char ifname[IFNAMSIZ];
2367         struct nlattr *tb[IFLA_MAX+1];
2368         int err;
2369
2370         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2371         if (err < 0)
2372                 return err;
2373
2374         if (tb[IFLA_IFNAME])
2375                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2376
2377         ifm = nlmsg_data(nlh);
2378         if (ifm->ifi_index > 0)
2379                 dev = __dev_get_by_index(net, ifm->ifi_index);
2380         else if (tb[IFLA_IFNAME])
2381                 dev = __dev_get_by_name(net, ifname);
2382         else if (tb[IFLA_GROUP])
2383                 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2384         else
2385                 return -EINVAL;
2386
2387         if (!dev)
2388                 return -ENODEV;
2389
2390         return rtnl_delete_link(dev);
2391 }
2392
2393 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2394 {
2395         unsigned int old_flags;
2396         int err;
2397
2398         old_flags = dev->flags;
2399         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2400                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2401                 if (err < 0)
2402                         return err;
2403         }
2404
2405         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2406
2407         __dev_notify_flags(dev, old_flags, ~0U);
2408         return 0;
2409 }
2410 EXPORT_SYMBOL(rtnl_configure_link);
2411
2412 struct net_device *rtnl_create_link(struct net *net,
2413         const char *ifname, unsigned char name_assign_type,
2414         const struct rtnl_link_ops *ops, struct nlattr *tb[])
2415 {
2416         struct net_device *dev;
2417         unsigned int num_tx_queues = 1;
2418         unsigned int num_rx_queues = 1;
2419
2420         if (tb[IFLA_NUM_TX_QUEUES])
2421                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2422         else if (ops->get_num_tx_queues)
2423                 num_tx_queues = ops->get_num_tx_queues();
2424
2425         if (tb[IFLA_NUM_RX_QUEUES])
2426                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2427         else if (ops->get_num_rx_queues)
2428                 num_rx_queues = ops->get_num_rx_queues();
2429
2430         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2431                                ops->setup, num_tx_queues, num_rx_queues);
2432         if (!dev)
2433                 return ERR_PTR(-ENOMEM);
2434
2435         dev_net_set(dev, net);
2436         dev->rtnl_link_ops = ops;
2437         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2438
2439         if (tb[IFLA_MTU])
2440                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2441         if (tb[IFLA_ADDRESS]) {
2442                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2443                                 nla_len(tb[IFLA_ADDRESS]));
2444                 dev->addr_assign_type = NET_ADDR_SET;
2445         }
2446         if (tb[IFLA_BROADCAST])
2447                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2448                                 nla_len(tb[IFLA_BROADCAST]));
2449         if (tb[IFLA_TXQLEN])
2450                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2451         if (tb[IFLA_OPERSTATE])
2452                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2453         if (tb[IFLA_LINKMODE])
2454                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2455         if (tb[IFLA_GROUP])
2456                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2457
2458         return dev;
2459 }
2460 EXPORT_SYMBOL(rtnl_create_link);
2461
2462 static int rtnl_group_changelink(const struct sk_buff *skb,
2463                 struct net *net, int group,
2464                 struct ifinfomsg *ifm,
2465                 struct netlink_ext_ack *extack,
2466                 struct nlattr **tb)
2467 {
2468         struct net_device *dev, *aux;
2469         int err;
2470
2471         for_each_netdev_safe(net, dev, aux) {
2472                 if (dev->group == group) {
2473                         err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
2474                         if (err < 0)
2475                                 return err;
2476                 }
2477         }
2478
2479         return 0;
2480 }
2481
2482 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2483                         struct netlink_ext_ack *extack)
2484 {
2485         struct net *net = sock_net(skb->sk);
2486         const struct rtnl_link_ops *ops;
2487         const struct rtnl_link_ops *m_ops = NULL;
2488         struct net_device *dev;
2489         struct net_device *master_dev = NULL;
2490         struct ifinfomsg *ifm;
2491         char kind[MODULE_NAME_LEN];
2492         char ifname[IFNAMSIZ];
2493         struct nlattr *tb[IFLA_MAX+1];
2494         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2495         unsigned char name_assign_type = NET_NAME_USER;
2496         int err;
2497
2498 #ifdef CONFIG_MODULES
2499 replay:
2500 #endif
2501         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2502         if (err < 0)
2503                 return err;
2504
2505         if (tb[IFLA_IFNAME])
2506                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2507         else
2508                 ifname[0] = '\0';
2509
2510         ifm = nlmsg_data(nlh);
2511         if (ifm->ifi_index > 0)
2512                 dev = __dev_get_by_index(net, ifm->ifi_index);
2513         else {
2514                 if (ifname[0])
2515                         dev = __dev_get_by_name(net, ifname);
2516                 else
2517                         dev = NULL;
2518         }
2519
2520         if (dev) {
2521                 master_dev = netdev_master_upper_dev_get(dev);
2522                 if (master_dev)
2523                         m_ops = master_dev->rtnl_link_ops;
2524         }
2525
2526         err = validate_linkmsg(dev, tb);
2527         if (err < 0)
2528                 return err;
2529
2530         if (tb[IFLA_LINKINFO]) {
2531                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2532                                        tb[IFLA_LINKINFO], ifla_info_policy,
2533                                        NULL);
2534                 if (err < 0)
2535                         return err;
2536         } else
2537                 memset(linkinfo, 0, sizeof(linkinfo));
2538
2539         if (linkinfo[IFLA_INFO_KIND]) {
2540                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2541                 ops = rtnl_link_ops_get(kind);
2542         } else {
2543                 kind[0] = '\0';
2544                 ops = NULL;
2545         }
2546
2547         if (1) {
2548                 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2549                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2550                 struct nlattr **data = NULL;
2551                 struct nlattr **slave_data = NULL;
2552                 struct net *dest_net, *link_net = NULL;
2553
2554                 if (ops) {
2555                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2556                                 err = nla_parse_nested(attr, ops->maxtype,
2557                                                        linkinfo[IFLA_INFO_DATA],
2558                                                        ops->policy, NULL);
2559                                 if (err < 0)
2560                                         return err;
2561                                 data = attr;
2562                         }
2563                         if (ops->validate) {
2564                                 err = ops->validate(tb, data, extack);
2565                                 if (err < 0)
2566                                         return err;
2567                         }
2568                 }
2569
2570                 if (m_ops) {
2571                         if (m_ops->slave_maxtype &&
2572                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
2573                                 err = nla_parse_nested(slave_attr,
2574                                                        m_ops->slave_maxtype,
2575                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
2576                                                        m_ops->slave_policy,
2577                                                        NULL);
2578                                 if (err < 0)
2579                                         return err;
2580                                 slave_data = slave_attr;
2581                         }
2582                         if (m_ops->slave_validate) {
2583                                 err = m_ops->slave_validate(tb, slave_data,
2584                                                             extack);
2585                                 if (err < 0)
2586                                         return err;
2587                         }
2588                 }
2589
2590                 if (dev) {
2591                         int status = 0;
2592
2593                         if (nlh->nlmsg_flags & NLM_F_EXCL)
2594                                 return -EEXIST;
2595                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
2596                                 return -EOPNOTSUPP;
2597
2598                         if (linkinfo[IFLA_INFO_DATA]) {
2599                                 if (!ops || ops != dev->rtnl_link_ops ||
2600                                     !ops->changelink)
2601                                         return -EOPNOTSUPP;
2602
2603                                 err = ops->changelink(dev, tb, data, extack);
2604                                 if (err < 0)
2605                                         return err;
2606                                 status |= DO_SETLINK_NOTIFY;
2607                         }
2608
2609                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2610                                 if (!m_ops || !m_ops->slave_changelink)
2611                                         return -EOPNOTSUPP;
2612
2613                                 err = m_ops->slave_changelink(master_dev, dev,
2614                                                               tb, slave_data,
2615                                                               extack);
2616                                 if (err < 0)
2617                                         return err;
2618                                 status |= DO_SETLINK_NOTIFY;
2619                         }
2620
2621                         return do_setlink(skb, dev, ifm, extack, tb, ifname,
2622                                           status);
2623                 }
2624
2625                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2626                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2627                                 return rtnl_group_changelink(skb, net,
2628                                                 nla_get_u32(tb[IFLA_GROUP]),
2629                                                 ifm, extack, tb);
2630                         return -ENODEV;
2631                 }
2632
2633                 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
2634                         return -EOPNOTSUPP;
2635
2636                 if (!ops) {
2637 #ifdef CONFIG_MODULES
2638                         if (kind[0]) {
2639                                 __rtnl_unlock();
2640                                 request_module("rtnl-link-%s", kind);
2641                                 rtnl_lock();
2642                                 ops = rtnl_link_ops_get(kind);
2643                                 if (ops)
2644                                         goto replay;
2645                         }
2646 #endif
2647                         return -EOPNOTSUPP;
2648                 }
2649
2650                 if (!ops->setup)
2651                         return -EOPNOTSUPP;
2652
2653                 if (!ifname[0]) {
2654                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2655                         name_assign_type = NET_NAME_ENUM;
2656                 }
2657
2658                 dest_net = rtnl_link_get_net(net, tb);
2659                 if (IS_ERR(dest_net))
2660                         return PTR_ERR(dest_net);
2661
2662                 err = -EPERM;
2663                 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2664                         goto out;
2665
2666                 if (tb[IFLA_LINK_NETNSID]) {
2667                         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2668
2669                         link_net = get_net_ns_by_id(dest_net, id);
2670                         if (!link_net) {
2671                                 err =  -EINVAL;
2672                                 goto out;
2673                         }
2674                         err = -EPERM;
2675                         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2676                                 goto out;
2677                 }
2678
2679                 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2680                                        name_assign_type, ops, tb);
2681                 if (IS_ERR(dev)) {
2682                         err = PTR_ERR(dev);
2683                         goto out;
2684                 }
2685
2686                 dev->ifindex = ifm->ifi_index;
2687
2688                 if (ops->newlink) {
2689                         err = ops->newlink(link_net ? : net, dev, tb, data,
2690                                            extack);
2691                         /* Drivers should call free_netdev() in ->destructor
2692                          * and unregister it on failure after registration
2693                          * so that device could be finally freed in rtnl_unlock.
2694                          */
2695                         if (err < 0) {
2696                                 /* If device is not registered at all, free it now */
2697                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2698                                         free_netdev(dev);
2699                                 goto out;
2700                         }
2701                 } else {
2702                         err = register_netdevice(dev);
2703                         if (err < 0) {
2704                                 free_netdev(dev);
2705                                 goto out;
2706                         }
2707                 }
2708                 err = rtnl_configure_link(dev, ifm);
2709                 if (err < 0)
2710                         goto out_unregister;
2711                 if (link_net) {
2712                         err = dev_change_net_namespace(dev, dest_net, ifname);
2713                         if (err < 0)
2714                                 goto out_unregister;
2715                 }
2716                 if (tb[IFLA_MASTER]) {
2717                         err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
2718                         if (err)
2719                                 goto out_unregister;
2720                 }
2721 out:
2722                 if (link_net)
2723                         put_net(link_net);
2724                 put_net(dest_net);
2725                 return err;
2726 out_unregister:
2727                 if (ops->newlink) {
2728                         LIST_HEAD(list_kill);
2729
2730                         ops->dellink(dev, &list_kill);
2731                         unregister_netdevice_many(&list_kill);
2732                 } else {
2733                         unregister_netdevice(dev);
2734                 }
2735                 goto out;
2736         }
2737 }
2738
2739 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2740                         struct netlink_ext_ack *extack)
2741 {
2742         struct net *net = sock_net(skb->sk);
2743         struct ifinfomsg *ifm;
2744         char ifname[IFNAMSIZ];
2745         struct nlattr *tb[IFLA_MAX+1];
2746         struct net_device *dev = NULL;
2747         struct sk_buff *nskb;
2748         int err;
2749         u32 ext_filter_mask = 0;
2750
2751         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2752         if (err < 0)
2753                 return err;
2754
2755         if (tb[IFLA_IFNAME])
2756                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2757
2758         if (tb[IFLA_EXT_MASK])
2759                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2760
2761         ifm = nlmsg_data(nlh);
2762         if (ifm->ifi_index > 0)
2763                 dev = __dev_get_by_index(net, ifm->ifi_index);
2764         else if (tb[IFLA_IFNAME])
2765                 dev = __dev_get_by_name(net, ifname);
2766         else
2767                 return -EINVAL;
2768
2769         if (dev == NULL)
2770                 return -ENODEV;
2771
2772         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2773         if (nskb == NULL)
2774                 return -ENOBUFS;
2775
2776         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2777                                nlh->nlmsg_seq, 0, 0, ext_filter_mask, 0);
2778         if (err < 0) {
2779                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2780                 WARN_ON(err == -EMSGSIZE);
2781                 kfree_skb(nskb);
2782         } else
2783                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2784
2785         return err;
2786 }
2787
2788 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2789 {
2790         struct net *net = sock_net(skb->sk);
2791         struct net_device *dev;
2792         struct nlattr *tb[IFLA_MAX+1];
2793         u32 ext_filter_mask = 0;
2794         u16 min_ifinfo_dump_size = 0;
2795         int hdrlen;
2796
2797         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2798         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2799                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2800
2801         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
2802                 if (tb[IFLA_EXT_MASK])
2803                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2804         }
2805
2806         if (!ext_filter_mask)
2807                 return NLMSG_GOODSIZE;
2808         /*
2809          * traverse the list of net devices and compute the minimum
2810          * buffer size based upon the filter mask.
2811          */
2812         rcu_read_lock();
2813         for_each_netdev_rcu(net, dev) {
2814                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2815                                              if_nlmsg_size(dev,
2816                                                            ext_filter_mask));
2817         }
2818         rcu_read_unlock();
2819
2820         return nlmsg_total_size(min_ifinfo_dump_size);
2821 }
2822
2823 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2824 {
2825         int idx;
2826         int s_idx = cb->family;
2827
2828         if (s_idx == 0)
2829                 s_idx = 1;
2830
2831         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2832                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2833                 struct rtnl_link *handlers;
2834                 rtnl_dumpit_func dumpit;
2835
2836                 if (idx < s_idx || idx == PF_PACKET)
2837                         continue;
2838
2839                 handlers = rtnl_dereference(rtnl_msg_handlers[idx]);
2840                 if (!handlers)
2841                         continue;
2842
2843                 dumpit = READ_ONCE(handlers[type].dumpit);
2844                 if (!dumpit)
2845                         continue;
2846
2847                 if (idx > s_idx) {
2848                         memset(&cb->args[0], 0, sizeof(cb->args));
2849                         cb->prev_seq = 0;
2850                         cb->seq = 0;
2851                 }
2852                 if (dumpit(skb, cb))
2853                         break;
2854         }
2855         cb->family = idx;
2856
2857         return skb->len;
2858 }
2859
2860 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2861                                        unsigned int change,
2862                                        u32 event, gfp_t flags)
2863 {
2864         struct net *net = dev_net(dev);
2865         struct sk_buff *skb;
2866         int err = -ENOBUFS;
2867         size_t if_info_size;
2868
2869         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2870         if (skb == NULL)
2871                 goto errout;
2872
2873         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0, event);
2874         if (err < 0) {
2875                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2876                 WARN_ON(err == -EMSGSIZE);
2877                 kfree_skb(skb);
2878                 goto errout;
2879         }
2880         return skb;
2881 errout:
2882         if (err < 0)
2883                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2884         return NULL;
2885 }
2886
2887 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2888 {
2889         struct net *net = dev_net(dev);
2890
2891         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2892 }
2893
2894 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
2895                                unsigned int change, u32 event,
2896                                gfp_t flags)
2897 {
2898         struct sk_buff *skb;
2899
2900         if (dev->reg_state != NETREG_REGISTERED)
2901                 return;
2902
2903         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags);
2904         if (skb)
2905                 rtmsg_ifinfo_send(skb, dev, flags);
2906 }
2907
2908 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2909                   gfp_t flags)
2910 {
2911         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags);
2912 }
2913 EXPORT_SYMBOL(rtmsg_ifinfo);
2914
2915 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2916                                    struct net_device *dev,
2917                                    u8 *addr, u16 vid, u32 pid, u32 seq,
2918                                    int type, unsigned int flags,
2919                                    int nlflags, u16 ndm_state)
2920 {
2921         struct nlmsghdr *nlh;
2922         struct ndmsg *ndm;
2923
2924         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2925         if (!nlh)
2926                 return -EMSGSIZE;
2927
2928         ndm = nlmsg_data(nlh);
2929         ndm->ndm_family  = AF_BRIDGE;
2930         ndm->ndm_pad1    = 0;
2931         ndm->ndm_pad2    = 0;
2932         ndm->ndm_flags   = flags;
2933         ndm->ndm_type    = 0;
2934         ndm->ndm_ifindex = dev->ifindex;
2935         ndm->ndm_state   = ndm_state;
2936
2937         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2938                 goto nla_put_failure;
2939         if (vid)
2940                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2941                         goto nla_put_failure;
2942
2943         nlmsg_end(skb, nlh);
2944         return 0;
2945
2946 nla_put_failure:
2947         nlmsg_cancel(skb, nlh);
2948         return -EMSGSIZE;
2949 }
2950
2951 static inline size_t rtnl_fdb_nlmsg_size(void)
2952 {
2953         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
2954                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
2955                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
2956                0;
2957 }
2958
2959 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
2960                             u16 ndm_state)
2961 {
2962         struct net *net = dev_net(dev);
2963         struct sk_buff *skb;
2964         int err = -ENOBUFS;
2965
2966         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2967         if (!skb)
2968                 goto errout;
2969
2970         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2971                                       0, 0, type, NTF_SELF, 0, ndm_state);
2972         if (err < 0) {
2973                 kfree_skb(skb);
2974                 goto errout;
2975         }
2976
2977         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2978         return;
2979 errout:
2980         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2981 }
2982
2983 /**
2984  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2985  */
2986 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2987                      struct nlattr *tb[],
2988                      struct net_device *dev,
2989                      const unsigned char *addr, u16 vid,
2990                      u16 flags)
2991 {
2992         int err = -EINVAL;
2993
2994         /* If aging addresses are supported device will need to
2995          * implement its own handler for this.
2996          */
2997         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2998                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2999                 return err;
3000         }
3001
3002         if (vid) {
3003                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3004                 return err;
3005         }
3006
3007         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3008                 err = dev_uc_add_excl(dev, addr);
3009         else if (is_multicast_ether_addr(addr))
3010                 err = dev_mc_add_excl(dev, addr);
3011
3012         /* Only return duplicate errors if NLM_F_EXCL is set */
3013         if (err == -EEXIST && !(flags & NLM_F_EXCL))
3014                 err = 0;
3015
3016         return err;
3017 }
3018 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3019
3020 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
3021 {
3022         u16 vid = 0;
3023
3024         if (vlan_attr) {
3025                 if (nla_len(vlan_attr) != sizeof(u16)) {
3026                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
3027                         return -EINVAL;
3028                 }
3029
3030                 vid = nla_get_u16(vlan_attr);
3031
3032                 if (!vid || vid >= VLAN_VID_MASK) {
3033                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
3034                                 vid);
3035                         return -EINVAL;
3036                 }
3037         }
3038         *p_vid = vid;
3039         return 0;
3040 }
3041
3042 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3043                         struct netlink_ext_ack *extack)
3044 {
3045         struct net *net = sock_net(skb->sk);
3046         struct ndmsg *ndm;
3047         struct nlattr *tb[NDA_MAX+1];
3048         struct net_device *dev;
3049         u8 *addr;
3050         u16 vid;
3051         int err;
3052
3053         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3054         if (err < 0)
3055                 return err;
3056
3057         ndm = nlmsg_data(nlh);
3058         if (ndm->ndm_ifindex == 0) {
3059                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
3060                 return -EINVAL;
3061         }
3062
3063         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3064         if (dev == NULL) {
3065                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
3066                 return -ENODEV;
3067         }
3068
3069         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3070                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
3071                 return -EINVAL;
3072         }
3073
3074         addr = nla_data(tb[NDA_LLADDR]);
3075
3076         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
3077         if (err)
3078                 return err;
3079
3080         err = -EOPNOTSUPP;
3081
3082         /* Support fdb on master device the net/bridge default case */
3083         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3084             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3085                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3086                 const struct net_device_ops *ops = br_dev->netdev_ops;
3087
3088                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3089                                        nlh->nlmsg_flags);
3090                 if (err)
3091                         goto out;
3092                 else
3093                         ndm->ndm_flags &= ~NTF_MASTER;
3094         }
3095
3096         /* Embedded bridge, macvlan, and any other device support */
3097         if ((ndm->ndm_flags & NTF_SELF)) {
3098                 if (dev->netdev_ops->ndo_fdb_add)
3099                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3100                                                            vid,
3101                                                            nlh->nlmsg_flags);
3102                 else
3103                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3104                                                nlh->nlmsg_flags);
3105
3106                 if (!err) {
3107                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3108                                         ndm->ndm_state);
3109                         ndm->ndm_flags &= ~NTF_SELF;
3110                 }
3111         }
3112 out:
3113         return err;
3114 }
3115
3116 /**
3117  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3118  */
3119 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3120                      struct nlattr *tb[],
3121                      struct net_device *dev,
3122                      const unsigned char *addr, u16 vid)
3123 {
3124         int err = -EINVAL;
3125
3126         /* If aging addresses are supported device will need to
3127          * implement its own handler for this.
3128          */
3129         if (!(ndm->ndm_state & NUD_PERMANENT)) {
3130                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3131                 return err;
3132         }
3133
3134         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3135                 err = dev_uc_del(dev, addr);
3136         else if (is_multicast_ether_addr(addr))
3137                 err = dev_mc_del(dev, addr);
3138
3139         return err;
3140 }
3141 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3142
3143 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3144                         struct netlink_ext_ack *extack)
3145 {
3146         struct net *net = sock_net(skb->sk);
3147         struct ndmsg *ndm;
3148         struct nlattr *tb[NDA_MAX+1];
3149         struct net_device *dev;
3150         int err = -EINVAL;
3151         __u8 *addr;
3152         u16 vid;
3153
3154         if (!netlink_capable(skb, CAP_NET_ADMIN))
3155                 return -EPERM;
3156
3157         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3158         if (err < 0)
3159                 return err;
3160
3161         ndm = nlmsg_data(nlh);
3162         if (ndm->ndm_ifindex == 0) {
3163                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
3164                 return -EINVAL;
3165         }
3166
3167         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3168         if (dev == NULL) {
3169                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
3170                 return -ENODEV;
3171         }
3172
3173         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3174                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
3175                 return -EINVAL;
3176         }
3177
3178         addr = nla_data(tb[NDA_LLADDR]);
3179
3180         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
3181         if (err)
3182                 return err;
3183
3184         err = -EOPNOTSUPP;
3185
3186         /* Support fdb on master device the net/bridge default case */
3187         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3188             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3189                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3190                 const struct net_device_ops *ops = br_dev->netdev_ops;
3191
3192                 if (ops->ndo_fdb_del)
3193                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3194
3195                 if (err)
3196                         goto out;
3197                 else
3198                         ndm->ndm_flags &= ~NTF_MASTER;
3199         }
3200
3201         /* Embedded bridge, macvlan, and any other device support */
3202         if (ndm->ndm_flags & NTF_SELF) {
3203                 if (dev->netdev_ops->ndo_fdb_del)
3204                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3205                                                            vid);
3206                 else
3207                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3208
3209                 if (!err) {
3210                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3211                                         ndm->ndm_state);
3212                         ndm->ndm_flags &= ~NTF_SELF;
3213                 }
3214         }
3215 out:
3216         return err;
3217 }
3218
3219 static int nlmsg_populate_fdb(struct sk_buff *skb,
3220                               struct netlink_callback *cb,
3221                               struct net_device *dev,
3222                               int *idx,
3223                               struct netdev_hw_addr_list *list)
3224 {
3225         struct netdev_hw_addr *ha;
3226         int err;
3227         u32 portid, seq;
3228
3229         portid = NETLINK_CB(cb->skb).portid;
3230         seq = cb->nlh->nlmsg_seq;
3231
3232         list_for_each_entry(ha, &list->list, list) {
3233                 if (*idx < cb->args[2])
3234                         goto skip;
3235
3236                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3237                                               portid, seq,
3238                                               RTM_NEWNEIGH, NTF_SELF,
3239                                               NLM_F_MULTI, NUD_PERMANENT);
3240                 if (err < 0)
3241                         return err;
3242 skip:
3243                 *idx += 1;
3244         }
3245         return 0;
3246 }
3247
3248 /**
3249  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3250  * @nlh: netlink message header
3251  * @dev: netdevice
3252  *
3253  * Default netdevice operation to dump the existing unicast address list.
3254  * Returns number of addresses from list put in skb.
3255  */
3256 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3257                       struct netlink_callback *cb,
3258                       struct net_device *dev,
3259                       struct net_device *filter_dev,
3260                       int *idx)
3261 {
3262         int err;
3263
3264         netif_addr_lock_bh(dev);
3265         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3266         if (err)
3267                 goto out;
3268         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3269 out:
3270         netif_addr_unlock_bh(dev);
3271         return err;
3272 }
3273 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3274
3275 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3276 {
3277         struct net_device *dev;
3278         struct nlattr *tb[IFLA_MAX+1];
3279         struct net_device *br_dev = NULL;
3280         const struct net_device_ops *ops = NULL;
3281         const struct net_device_ops *cops = NULL;
3282         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3283         struct net *net = sock_net(skb->sk);
3284         struct hlist_head *head;
3285         int brport_idx = 0;
3286         int br_idx = 0;
3287         int h, s_h;
3288         int idx = 0, s_idx;
3289         int err = 0;
3290         int fidx = 0;
3291
3292         err = nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb,
3293                           IFLA_MAX, ifla_policy, NULL);
3294         if (err < 0) {
3295                 return -EINVAL;
3296         } else if (err == 0) {
3297                 if (tb[IFLA_MASTER])
3298                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
3299         }
3300
3301         brport_idx = ifm->ifi_index;
3302
3303         if (br_idx) {
3304                 br_dev = __dev_get_by_index(net, br_idx);
3305                 if (!br_dev)
3306                         return -ENODEV;
3307
3308                 ops = br_dev->netdev_ops;
3309         }
3310
3311         s_h = cb->args[0];
3312         s_idx = cb->args[1];
3313
3314         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3315                 idx = 0;
3316                 head = &net->dev_index_head[h];
3317                 hlist_for_each_entry(dev, head, index_hlist) {
3318
3319                         if (brport_idx && (dev->ifindex != brport_idx))
3320                                 continue;
3321
3322                         if (!br_idx) { /* user did not specify a specific bridge */
3323                                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3324                                         br_dev = netdev_master_upper_dev_get(dev);
3325                                         cops = br_dev->netdev_ops;
3326                                 }
3327                         } else {
3328                                 if (dev != br_dev &&
3329                                     !(dev->priv_flags & IFF_BRIDGE_PORT))
3330                                         continue;
3331
3332                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
3333                                     !(dev->priv_flags & IFF_EBRIDGE))
3334                                         continue;
3335                                 cops = ops;
3336                         }
3337
3338                         if (idx < s_idx)
3339                                 goto cont;
3340
3341                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
3342                                 if (cops && cops->ndo_fdb_dump) {
3343                                         err = cops->ndo_fdb_dump(skb, cb,
3344                                                                 br_dev, dev,
3345                                                                 &fidx);
3346                                         if (err == -EMSGSIZE)
3347                                                 goto out;
3348                                 }
3349                         }
3350
3351                         if (dev->netdev_ops->ndo_fdb_dump)
3352                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
3353                                                                     dev, NULL,
3354                                                                     &fidx);
3355                         else
3356                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
3357                                                         &fidx);
3358                         if (err == -EMSGSIZE)
3359                                 goto out;
3360
3361                         cops = NULL;
3362
3363                         /* reset fdb offset to 0 for rest of the interfaces */
3364                         cb->args[2] = 0;
3365                         fidx = 0;
3366 cont:
3367                         idx++;
3368                 }
3369         }
3370
3371 out:
3372         cb->args[0] = h;
3373         cb->args[1] = idx;
3374         cb->args[2] = fidx;
3375
3376         return skb->len;
3377 }
3378
3379 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3380                                unsigned int attrnum, unsigned int flag)
3381 {
3382         if (mask & flag)
3383                 return nla_put_u8(skb, attrnum, !!(flags & flag));
3384         return 0;
3385 }
3386
3387 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3388                             struct net_device *dev, u16 mode,
3389                             u32 flags, u32 mask, int nlflags,
3390                             u32 filter_mask,
3391                             int (*vlan_fill)(struct sk_buff *skb,
3392                                              struct net_device *dev,
3393                                              u32 filter_mask))
3394 {
3395         struct nlmsghdr *nlh;
3396         struct ifinfomsg *ifm;
3397         struct nlattr *br_afspec;
3398         struct nlattr *protinfo;
3399         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3400         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3401         int err = 0;
3402
3403         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3404         if (nlh == NULL)
3405                 return -EMSGSIZE;
3406
3407         ifm = nlmsg_data(nlh);
3408         ifm->ifi_family = AF_BRIDGE;
3409         ifm->__ifi_pad = 0;
3410         ifm->ifi_type = dev->type;
3411         ifm->ifi_index = dev->ifindex;
3412         ifm->ifi_flags = dev_get_flags(dev);
3413         ifm->ifi_change = 0;
3414
3415
3416         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3417             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3418             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3419             (br_dev &&
3420              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3421             (dev->addr_len &&
3422              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3423             (dev->ifindex != dev_get_iflink(dev) &&
3424              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3425                 goto nla_put_failure;
3426
3427         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3428         if (!br_afspec)
3429                 goto nla_put_failure;
3430
3431         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3432                 nla_nest_cancel(skb, br_afspec);
3433                 goto nla_put_failure;
3434         }
3435
3436         if (mode != BRIDGE_MODE_UNDEF) {
3437                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3438                         nla_nest_cancel(skb, br_afspec);
3439                         goto nla_put_failure;
3440                 }
3441         }
3442         if (vlan_fill) {
3443                 err = vlan_fill(skb, dev, filter_mask);
3444                 if (err) {
3445                         nla_nest_cancel(skb, br_afspec);
3446                         goto nla_put_failure;
3447                 }
3448         }
3449         nla_nest_end(skb, br_afspec);
3450
3451         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3452         if (!protinfo)
3453                 goto nla_put_failure;
3454
3455         if (brport_nla_put_flag(skb, flags, mask,
3456                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3457             brport_nla_put_flag(skb, flags, mask,
3458                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3459             brport_nla_put_flag(skb, flags, mask,
3460                                 IFLA_BRPORT_FAST_LEAVE,
3461                                 BR_MULTICAST_FAST_LEAVE) ||
3462             brport_nla_put_flag(skb, flags, mask,
3463                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3464             brport_nla_put_flag(skb, flags, mask,
3465                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3466             brport_nla_put_flag(skb, flags, mask,
3467                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3468             brport_nla_put_flag(skb, flags, mask,
3469                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3470             brport_nla_put_flag(skb, flags, mask,
3471                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3472                 nla_nest_cancel(skb, protinfo);
3473                 goto nla_put_failure;
3474         }
3475
3476         nla_nest_end(skb, protinfo);
3477
3478         nlmsg_end(skb, nlh);
3479         return 0;
3480 nla_put_failure:
3481         nlmsg_cancel(skb, nlh);
3482         return err ? err : -EMSGSIZE;
3483 }
3484 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3485
3486 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3487 {
3488         struct net *net = sock_net(skb->sk);
3489         struct net_device *dev;
3490         int idx = 0;
3491         u32 portid = NETLINK_CB(cb->skb).portid;
3492         u32 seq = cb->nlh->nlmsg_seq;
3493         u32 filter_mask = 0;
3494         int err;
3495
3496         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3497                 struct nlattr *extfilt;
3498
3499                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3500                                           IFLA_EXT_MASK);
3501                 if (extfilt) {
3502                         if (nla_len(extfilt) < sizeof(filter_mask))
3503                                 return -EINVAL;
3504
3505                         filter_mask = nla_get_u32(extfilt);
3506                 }
3507         }
3508
3509         rcu_read_lock();
3510         for_each_netdev_rcu(net, dev) {
3511                 const struct net_device_ops *ops = dev->netdev_ops;
3512                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3513
3514                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3515                         if (idx >= cb->args[0]) {
3516                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
3517                                                 skb, portid, seq, dev,
3518                                                 filter_mask, NLM_F_MULTI);
3519                                 if (err < 0 && err != -EOPNOTSUPP) {
3520                                         if (likely(skb->len))
3521                                                 break;
3522
3523                                         goto out_err;
3524                                 }
3525                         }
3526                         idx++;
3527                 }
3528
3529                 if (ops->ndo_bridge_getlink) {
3530                         if (idx >= cb->args[0]) {
3531                                 err = ops->ndo_bridge_getlink(skb, portid,
3532                                                               seq, dev,
3533                                                               filter_mask,
3534                                                               NLM_F_MULTI);
3535                                 if (err < 0 && err != -EOPNOTSUPP) {
3536                                         if (likely(skb->len))
3537                                                 break;
3538
3539                                         goto out_err;
3540                                 }
3541                         }
3542                         idx++;
3543                 }
3544         }
3545         err = skb->len;
3546 out_err:
3547         rcu_read_unlock();
3548         cb->args[0] = idx;
3549
3550         return err;
3551 }
3552
3553 static inline size_t bridge_nlmsg_size(void)
3554 {
3555         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3556                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
3557                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
3558                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
3559                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
3560                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
3561                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
3562                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
3563                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3564                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
3565                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
3566 }
3567
3568 static int rtnl_bridge_notify(struct net_device *dev)
3569 {
3570         struct net *net = dev_net(dev);
3571         struct sk_buff *skb;
3572         int err = -EOPNOTSUPP;
3573
3574         if (!dev->netdev_ops->ndo_bridge_getlink)
3575                 return 0;
3576
3577         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3578         if (!skb) {
3579                 err = -ENOMEM;
3580                 goto errout;
3581         }
3582
3583         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3584         if (err < 0)
3585                 goto errout;
3586
3587         if (!skb->len)
3588                 goto errout;
3589
3590         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3591         return 0;
3592 errout:
3593         WARN_ON(err == -EMSGSIZE);
3594         kfree_skb(skb);
3595         if (err)
3596                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3597         return err;
3598 }
3599
3600 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3601                                struct netlink_ext_ack *extack)
3602 {
3603         struct net *net = sock_net(skb->sk);
3604         struct ifinfomsg *ifm;
3605         struct net_device *dev;
3606         struct nlattr *br_spec, *attr = NULL;
3607         int rem, err = -EOPNOTSUPP;
3608         u16 flags = 0;
3609         bool have_flags = false;
3610
3611         if (nlmsg_len(nlh) < sizeof(*ifm))
3612                 return -EINVAL;
3613
3614         ifm = nlmsg_data(nlh);
3615         if (ifm->ifi_family != AF_BRIDGE)
3616                 return -EPFNOSUPPORT;
3617
3618         dev = __dev_get_by_index(net, ifm->ifi_index);
3619         if (!dev) {
3620                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3621                 return -ENODEV;
3622         }
3623
3624         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3625         if (br_spec) {
3626                 nla_for_each_nested(attr, br_spec, rem) {
3627                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3628                                 if (nla_len(attr) < sizeof(flags))
3629                                         return -EINVAL;
3630
3631                                 have_flags = true;
3632                                 flags = nla_get_u16(attr);
3633                                 break;
3634                         }
3635                 }
3636         }
3637
3638         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3639                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3640
3641                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3642                         err = -EOPNOTSUPP;
3643                         goto out;
3644                 }
3645
3646                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3647                 if (err)
3648                         goto out;
3649
3650                 flags &= ~BRIDGE_FLAGS_MASTER;
3651         }
3652
3653         if ((flags & BRIDGE_FLAGS_SELF)) {
3654                 if (!dev->netdev_ops->ndo_bridge_setlink)
3655                         err = -EOPNOTSUPP;
3656                 else
3657                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3658                                                                   flags);
3659                 if (!err) {
3660                         flags &= ~BRIDGE_FLAGS_SELF;
3661
3662                         /* Generate event to notify upper layer of bridge
3663                          * change
3664                          */
3665                         err = rtnl_bridge_notify(dev);
3666                 }
3667         }
3668
3669         if (have_flags)
3670                 memcpy(nla_data(attr), &flags, sizeof(flags));
3671 out:
3672         return err;
3673 }
3674
3675 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
3676                                struct netlink_ext_ack *extack)
3677 {
3678         struct net *net = sock_net(skb->sk);
3679         struct ifinfomsg *ifm;
3680         struct net_device *dev;
3681         struct nlattr *br_spec, *attr = NULL;
3682         int rem, err = -EOPNOTSUPP;
3683         u16 flags = 0;
3684         bool have_flags = false;
3685
3686         if (nlmsg_len(nlh) < sizeof(*ifm))
3687                 return -EINVAL;
3688
3689         ifm = nlmsg_data(nlh);
3690         if (ifm->ifi_family != AF_BRIDGE)
3691                 return -EPFNOSUPPORT;
3692
3693         dev = __dev_get_by_index(net, ifm->ifi_index);
3694         if (!dev) {
3695                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3696                 return -ENODEV;
3697         }
3698
3699         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3700         if (br_spec) {
3701                 nla_for_each_nested(attr, br_spec, rem) {
3702                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3703                                 if (nla_len(attr) < sizeof(flags))
3704                                         return -EINVAL;
3705
3706                                 have_flags = true;
3707                                 flags = nla_get_u16(attr);
3708                                 break;
3709                         }
3710                 }
3711         }
3712
3713         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3714                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3715
3716                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3717                         err = -EOPNOTSUPP;
3718                         goto out;
3719                 }
3720
3721                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3722                 if (err)
3723                         goto out;
3724
3725                 flags &= ~BRIDGE_FLAGS_MASTER;
3726         }
3727
3728         if ((flags & BRIDGE_FLAGS_SELF)) {
3729                 if (!dev->netdev_ops->ndo_bridge_dellink)
3730                         err = -EOPNOTSUPP;
3731                 else
3732                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3733                                                                   flags);
3734
3735                 if (!err) {
3736                         flags &= ~BRIDGE_FLAGS_SELF;
3737
3738                         /* Generate event to notify upper layer of bridge
3739                          * change
3740                          */
3741                         err = rtnl_bridge_notify(dev);
3742                 }
3743         }
3744
3745         if (have_flags)
3746                 memcpy(nla_data(attr), &flags, sizeof(flags));
3747 out:
3748         return err;
3749 }
3750
3751 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
3752 {
3753         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
3754                (!idxattr || idxattr == attrid);
3755 }
3756
3757 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
3758 static int rtnl_get_offload_stats_attr_size(int attr_id)
3759 {
3760         switch (attr_id) {
3761         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
3762                 return sizeof(struct rtnl_link_stats64);
3763         }
3764
3765         return 0;
3766 }
3767
3768 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
3769                                   int *prividx)
3770 {
3771         struct nlattr *attr = NULL;
3772         int attr_id, size;
3773         void *attr_data;
3774         int err;
3775
3776         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3777               dev->netdev_ops->ndo_get_offload_stats))
3778                 return -ENODATA;
3779
3780         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3781              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3782                 if (attr_id < *prividx)
3783                         continue;
3784
3785                 size = rtnl_get_offload_stats_attr_size(attr_id);
3786                 if (!size)
3787                         continue;
3788
3789                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
3790                         continue;
3791
3792                 attr = nla_reserve_64bit(skb, attr_id, size,
3793                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
3794                 if (!attr)
3795                         goto nla_put_failure;
3796
3797                 attr_data = nla_data(attr);
3798                 memset(attr_data, 0, size);
3799                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
3800                                                              attr_data);
3801                 if (err)
3802                         goto get_offload_stats_failure;
3803         }
3804
3805         if (!attr)
3806                 return -ENODATA;
3807
3808         *prividx = 0;
3809         return 0;
3810
3811 nla_put_failure:
3812         err = -EMSGSIZE;
3813 get_offload_stats_failure:
3814         *prividx = attr_id;
3815         return err;
3816 }
3817
3818 static int rtnl_get_offload_stats_size(const struct net_device *dev)
3819 {
3820         int nla_size = 0;
3821         int attr_id;
3822         int size;
3823
3824         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3825               dev->netdev_ops->ndo_get_offload_stats))
3826                 return 0;
3827
3828         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3829              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3830                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
3831                         continue;
3832                 size = rtnl_get_offload_stats_attr_size(attr_id);
3833                 nla_size += nla_total_size_64bit(size);
3834         }
3835
3836         if (nla_size != 0)
3837                 nla_size += nla_total_size(0);
3838
3839         return nla_size;
3840 }
3841
3842 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
3843                                int type, u32 pid, u32 seq, u32 change,
3844                                unsigned int flags, unsigned int filter_mask,
3845                                int *idxattr, int *prividx)
3846 {
3847         struct if_stats_msg *ifsm;
3848         struct nlmsghdr *nlh;
3849         struct nlattr *attr;
3850         int s_prividx = *prividx;
3851         int err;
3852
3853         ASSERT_RTNL();
3854
3855         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
3856         if (!nlh)
3857                 return -EMSGSIZE;
3858
3859         ifsm = nlmsg_data(nlh);
3860         ifsm->family = PF_UNSPEC;
3861         ifsm->pad1 = 0;
3862         ifsm->pad2 = 0;
3863         ifsm->ifindex = dev->ifindex;
3864         ifsm->filter_mask = filter_mask;
3865
3866         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
3867                 struct rtnl_link_stats64 *sp;
3868
3869                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
3870                                          sizeof(struct rtnl_link_stats64),
3871                                          IFLA_STATS_UNSPEC);
3872                 if (!attr)
3873                         goto nla_put_failure;
3874
3875                 sp = nla_data(attr);
3876                 dev_get_stats(dev, sp);
3877         }
3878
3879         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
3880                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3881
3882                 if (ops && ops->fill_linkxstats) {
3883                         *idxattr = IFLA_STATS_LINK_XSTATS;
3884                         attr = nla_nest_start(skb,
3885                                               IFLA_STATS_LINK_XSTATS);
3886                         if (!attr)
3887                                 goto nla_put_failure;
3888
3889                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3890                         nla_nest_end(skb, attr);
3891                         if (err)
3892                                 goto nla_put_failure;
3893                         *idxattr = 0;
3894                 }
3895         }
3896
3897         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
3898                              *idxattr)) {
3899                 const struct rtnl_link_ops *ops = NULL;
3900                 const struct net_device *master;
3901
3902                 master = netdev_master_upper_dev_get(dev);
3903                 if (master)
3904                         ops = master->rtnl_link_ops;
3905                 if (ops && ops->fill_linkxstats) {
3906                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
3907                         attr = nla_nest_start(skb,
3908                                               IFLA_STATS_LINK_XSTATS_SLAVE);
3909                         if (!attr)
3910                                 goto nla_put_failure;
3911
3912                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3913                         nla_nest_end(skb, attr);
3914                         if (err)
3915                                 goto nla_put_failure;
3916                         *idxattr = 0;
3917                 }
3918         }
3919
3920         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
3921                              *idxattr)) {
3922                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
3923                 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
3924                 if (!attr)
3925                         goto nla_put_failure;
3926
3927                 err = rtnl_get_offload_stats(skb, dev, prividx);
3928                 if (err == -ENODATA)
3929                         nla_nest_cancel(skb, attr);
3930                 else
3931                         nla_nest_end(skb, attr);
3932
3933                 if (err && err != -ENODATA)
3934                         goto nla_put_failure;
3935                 *idxattr = 0;
3936         }
3937
3938         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
3939                 struct rtnl_af_ops *af_ops;
3940
3941                 *idxattr = IFLA_STATS_AF_SPEC;
3942                 attr = nla_nest_start(skb, IFLA_STATS_AF_SPEC);
3943                 if (!attr)
3944                         goto nla_put_failure;
3945
3946                 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
3947                         if (af_ops->fill_stats_af) {
3948                                 struct nlattr *af;
3949                                 int err;
3950
3951                                 af = nla_nest_start(skb, af_ops->family);
3952                                 if (!af)
3953                                         goto nla_put_failure;
3954
3955                                 err = af_ops->fill_stats_af(skb, dev);
3956
3957                                 if (err == -ENODATA)
3958                                         nla_nest_cancel(skb, af);
3959                                 else if (err < 0)
3960                                         goto nla_put_failure;
3961
3962                                 nla_nest_end(skb, af);
3963                         }
3964                 }
3965
3966                 nla_nest_end(skb, attr);
3967
3968                 *idxattr = 0;
3969         }
3970
3971         nlmsg_end(skb, nlh);
3972
3973         return 0;
3974
3975 nla_put_failure:
3976         /* not a multi message or no progress mean a real error */
3977         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
3978                 nlmsg_cancel(skb, nlh);
3979         else
3980                 nlmsg_end(skb, nlh);
3981
3982         return -EMSGSIZE;
3983 }
3984
3985 static size_t if_nlmsg_stats_size(const struct net_device *dev,
3986                                   u32 filter_mask)
3987 {
3988         size_t size = 0;
3989
3990         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
3991                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
3992
3993         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
3994                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3995                 int attr = IFLA_STATS_LINK_XSTATS;
3996
3997                 if (ops && ops->get_linkxstats_size) {
3998                         size += nla_total_size(ops->get_linkxstats_size(dev,
3999                                                                         attr));
4000                         /* for IFLA_STATS_LINK_XSTATS */
4001                         size += nla_total_size(0);
4002                 }
4003         }
4004
4005         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
4006                 struct net_device *_dev = (struct net_device *)dev;
4007                 const struct rtnl_link_ops *ops = NULL;
4008                 const struct net_device *master;
4009
4010                 /* netdev_master_upper_dev_get can't take const */
4011                 master = netdev_master_upper_dev_get(_dev);
4012                 if (master)
4013                         ops = master->rtnl_link_ops;
4014                 if (ops && ops->get_linkxstats_size) {
4015                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
4016
4017                         size += nla_total_size(ops->get_linkxstats_size(dev,
4018                                                                         attr));
4019                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
4020                         size += nla_total_size(0);
4021                 }
4022         }
4023
4024         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
4025                 size += rtnl_get_offload_stats_size(dev);
4026
4027         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
4028                 struct rtnl_af_ops *af_ops;
4029
4030                 /* for IFLA_STATS_AF_SPEC */
4031                 size += nla_total_size(0);
4032
4033                 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
4034                         if (af_ops->get_stats_af_size) {
4035                                 size += nla_total_size(
4036                                         af_ops->get_stats_af_size(dev));
4037
4038                                 /* for AF_* */
4039                                 size += nla_total_size(0);
4040                         }
4041                 }
4042         }
4043
4044         return size;
4045 }
4046
4047 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
4048                           struct netlink_ext_ack *extack)
4049 {
4050         struct net *net = sock_net(skb->sk);
4051         struct net_device *dev = NULL;
4052         int idxattr = 0, prividx = 0;
4053         struct if_stats_msg *ifsm;
4054         struct sk_buff *nskb;
4055         u32 filter_mask;
4056         int err;
4057
4058         if (nlmsg_len(nlh) < sizeof(*ifsm))
4059                 return -EINVAL;
4060
4061         ifsm = nlmsg_data(nlh);
4062         if (ifsm->ifindex > 0)
4063                 dev = __dev_get_by_index(net, ifsm->ifindex);
4064         else
4065                 return -EINVAL;
4066
4067         if (!dev)
4068                 return -ENODEV;
4069
4070         filter_mask = ifsm->filter_mask;
4071         if (!filter_mask)
4072                 return -EINVAL;
4073
4074         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
4075         if (!nskb)
4076                 return -ENOBUFS;
4077
4078         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
4079                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
4080                                   0, filter_mask, &idxattr, &prividx);
4081         if (err < 0) {
4082                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
4083                 WARN_ON(err == -EMSGSIZE);
4084                 kfree_skb(nskb);
4085         } else {
4086                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
4087         }
4088
4089         return err;
4090 }
4091
4092 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
4093 {
4094         int h, s_h, err, s_idx, s_idxattr, s_prividx;
4095         struct net *net = sock_net(skb->sk);
4096         unsigned int flags = NLM_F_MULTI;
4097         struct if_stats_msg *ifsm;
4098         struct hlist_head *head;
4099         struct net_device *dev;
4100         u32 filter_mask = 0;
4101         int idx = 0;
4102
4103         s_h = cb->args[0];
4104         s_idx = cb->args[1];
4105         s_idxattr = cb->args[2];
4106         s_prividx = cb->args[3];
4107
4108         cb->seq = net->dev_base_seq;
4109
4110         if (nlmsg_len(cb->nlh) < sizeof(*ifsm))
4111                 return -EINVAL;
4112
4113         ifsm = nlmsg_data(cb->nlh);
4114         filter_mask = ifsm->filter_mask;
4115         if (!filter_mask)
4116                 return -EINVAL;
4117
4118         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4119                 idx = 0;
4120                 head = &net->dev_index_head[h];
4121                 hlist_for_each_entry(dev, head, index_hlist) {
4122                         if (idx < s_idx)
4123                                 goto cont;
4124                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
4125                                                   NETLINK_CB(cb->skb).portid,
4126                                                   cb->nlh->nlmsg_seq, 0,
4127                                                   flags, filter_mask,
4128                                                   &s_idxattr, &s_prividx);
4129                         /* If we ran out of room on the first message,
4130                          * we're in trouble
4131                          */
4132                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
4133
4134                         if (err < 0)
4135                                 goto out;
4136                         s_prividx = 0;
4137                         s_idxattr = 0;
4138                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4139 cont:
4140                         idx++;
4141                 }
4142         }
4143 out:
4144         cb->args[3] = s_prividx;
4145         cb->args[2] = s_idxattr;
4146         cb->args[1] = idx;
4147         cb->args[0] = h;
4148
4149         return skb->len;
4150 }
4151
4152 /* Process one rtnetlink message. */
4153
4154 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
4155                              struct netlink_ext_ack *extack)
4156 {
4157         struct net *net = sock_net(skb->sk);
4158         struct rtnl_link *handlers;
4159         int err = -EOPNOTSUPP;
4160         rtnl_doit_func doit;
4161         unsigned int flags;
4162         int kind;
4163         int family;
4164         int type;
4165
4166         type = nlh->nlmsg_type;
4167         if (type > RTM_MAX)
4168                 return -EOPNOTSUPP;
4169
4170         type -= RTM_BASE;
4171
4172         /* All the messages must have at least 1 byte length */
4173         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
4174                 return 0;
4175
4176         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
4177         kind = type&3;
4178
4179         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
4180                 return -EPERM;
4181
4182         if (family >= ARRAY_SIZE(rtnl_msg_handlers))
4183                 family = PF_UNSPEC;
4184
4185         rcu_read_lock();
4186         handlers = rcu_dereference(rtnl_msg_handlers[family]);
4187         if (!handlers) {
4188                 family = PF_UNSPEC;
4189                 handlers = rcu_dereference(rtnl_msg_handlers[family]);
4190         }
4191
4192         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
4193                 struct sock *rtnl;
4194                 rtnl_dumpit_func dumpit;
4195                 u16 min_dump_alloc = 0;
4196
4197                 dumpit = READ_ONCE(handlers[type].dumpit);
4198                 if (!dumpit) {
4199                         family = PF_UNSPEC;
4200                         handlers = rcu_dereference(rtnl_msg_handlers[PF_UNSPEC]);
4201                         if (!handlers)
4202                                 goto err_unlock;
4203
4204                         dumpit = READ_ONCE(handlers[type].dumpit);
4205                         if (!dumpit)
4206                                 goto err_unlock;
4207                 }
4208
4209                 refcount_inc(&rtnl_msg_handlers_ref[family]);
4210
4211                 if (type == RTM_GETLINK - RTM_BASE)
4212                         min_dump_alloc = rtnl_calcit(skb, nlh);
4213
4214                 rcu_read_unlock();
4215
4216                 rtnl = net->rtnl;
4217                 {
4218                         struct netlink_dump_control c = {
4219                                 .dump           = dumpit,
4220                                 .min_dump_alloc = min_dump_alloc,
4221                         };
4222                         err = netlink_dump_start(rtnl, skb, nlh, &c);
4223                 }
4224                 refcount_dec(&rtnl_msg_handlers_ref[family]);
4225                 return err;
4226         }
4227
4228         doit = READ_ONCE(handlers[type].doit);
4229         if (!doit) {
4230                 family = PF_UNSPEC;
4231                 handlers = rcu_dereference(rtnl_msg_handlers[family]);
4232         }
4233
4234         flags = READ_ONCE(handlers[type].flags);
4235         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
4236                 refcount_inc(&rtnl_msg_handlers_ref[family]);
4237                 doit = READ_ONCE(handlers[type].doit);
4238                 rcu_read_unlock();
4239                 if (doit)
4240                         err = doit(skb, nlh, extack);
4241                 refcount_dec(&rtnl_msg_handlers_ref[family]);
4242                 return err;
4243         }
4244
4245         rcu_read_unlock();
4246
4247         rtnl_lock();
4248         handlers = rtnl_dereference(rtnl_msg_handlers[family]);
4249         if (handlers) {
4250                 doit = READ_ONCE(handlers[type].doit);
4251                 if (doit)
4252                         err = doit(skb, nlh, extack);
4253         }
4254         rtnl_unlock();
4255         return err;
4256
4257 err_unlock:
4258         rcu_read_unlock();
4259         return -EOPNOTSUPP;
4260 }
4261
4262 static void rtnetlink_rcv(struct sk_buff *skb)
4263 {
4264         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
4265 }
4266
4267 static int rtnetlink_bind(struct net *net, int group)
4268 {
4269         switch (group) {
4270         case RTNLGRP_IPV4_MROUTE_R:
4271         case RTNLGRP_IPV6_MROUTE_R:
4272                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4273                         return -EPERM;
4274                 break;
4275         }
4276         return 0;
4277 }
4278
4279 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
4280 {
4281         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4282
4283         switch (event) {
4284         case NETDEV_REBOOT:
4285         case NETDEV_CHANGEMTU:
4286         case NETDEV_CHANGEADDR:
4287         case NETDEV_CHANGENAME:
4288         case NETDEV_FEAT_CHANGE:
4289         case NETDEV_BONDING_FAILOVER:
4290         case NETDEV_POST_TYPE_CHANGE:
4291         case NETDEV_NOTIFY_PEERS:
4292         case NETDEV_CHANGEUPPER:
4293         case NETDEV_RESEND_IGMP:
4294         case NETDEV_CHANGEINFODATA:
4295         case NETDEV_CHANGE_TX_QUEUE_LEN:
4296                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
4297                                    GFP_KERNEL);
4298                 break;
4299         default:
4300                 break;
4301         }
4302         return NOTIFY_DONE;
4303 }
4304
4305 static struct notifier_block rtnetlink_dev_notifier = {
4306         .notifier_call  = rtnetlink_event,
4307 };
4308
4309
4310 static int __net_init rtnetlink_net_init(struct net *net)
4311 {
4312         struct sock *sk;
4313         struct netlink_kernel_cfg cfg = {
4314                 .groups         = RTNLGRP_MAX,
4315                 .input          = rtnetlink_rcv,
4316                 .cb_mutex       = &rtnl_mutex,
4317                 .flags          = NL_CFG_F_NONROOT_RECV,
4318                 .bind           = rtnetlink_bind,
4319         };
4320
4321         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
4322         if (!sk)
4323                 return -ENOMEM;
4324         net->rtnl = sk;
4325         return 0;
4326 }
4327
4328 static void __net_exit rtnetlink_net_exit(struct net *net)
4329 {
4330         netlink_kernel_release(net->rtnl);
4331         net->rtnl = NULL;
4332 }
4333
4334 static struct pernet_operations rtnetlink_net_ops = {
4335         .init = rtnetlink_net_init,
4336         .exit = rtnetlink_net_exit,
4337 };
4338
4339 void __init rtnetlink_init(void)
4340 {
4341         int i;
4342
4343         for (i = 0; i < ARRAY_SIZE(rtnl_msg_handlers_ref); i++)
4344                 refcount_set(&rtnl_msg_handlers_ref[i], 1);
4345
4346         if (register_pernet_subsys(&rtnetlink_net_ops))
4347                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
4348
4349         register_netdevice_notifier(&rtnetlink_dev_notifier);
4350
4351         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
4352                       rtnl_dump_ifinfo, 0);
4353         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
4354         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
4355         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
4356
4357         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
4358         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
4359         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
4360
4361         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
4362         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
4363         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, 0);
4364
4365         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
4366         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
4367         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
4368
4369         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
4370                       0);
4371 }