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/errno.h>
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/socket.h>
  23 #include <linux/kernel.h>
  24 #include <linux/timer.h>
  25 #include <linux/string.h>
  26 #include <linux/sockios.h>
  27 #include <linux/net.h>
  28 #include <linux/fcntl.h>
  29 #include <linux/mm.h>
  30 #include <linux/slab.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/capability.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/init.h>
  35 #include <linux/security.h>
  36 #include <linux/mutex.h>
  37 #include <linux/if_addr.h>
  38 #include <linux/if_bridge.h>
  39 #include <linux/pci.h>
  40 #include <linux/etherdevice.h>
  41
  42 #include <asm/uaccess.h>
  43
  44 #include <linux/inet.h>
  45 #include <linux/netdevice.h>
  46 #include <net/ip.h>
  47 #include <net/protocol.h>
  48 #include <net/arp.h>
  49 #include <net/route.h>
  50 #include <net/udp.h>
  51 #include <net/sock.h>
  52 #include <net/pkt_sched.h>
  53 #include <net/fib_rules.h>
  54 #include <net/rtnetlink.h>
  55 #include <net/net_namespace.h>
  56
  57 struct rtnl_link {
  58         rtnl_doit_func          doit;
  59         rtnl_dumpit_func        dumpit;
  60         rtnl_calcit_func        calcit;
  61 };
  62
  63 static DEFINE_MUTEX(rtnl_mutex);
  64
  65 void rtnl_lock(void)
  66 {
  67         mutex_lock(&rtnl_mutex);
  68 }
  69 EXPORT_SYMBOL(rtnl_lock);
  70
  71 void __rtnl_unlock(void)
  72 {
  73         mutex_unlock(&rtnl_mutex);
  74 }
  75
  76 void rtnl_unlock(void)
  77 {
  78         /* This fellow will unlock it for us. */
  79         netdev_run_todo();
  80 }
  81 EXPORT_SYMBOL(rtnl_unlock);
  82
  83 int rtnl_trylock(void)
  84 {
  85         return mutex_trylock(&rtnl_mutex);
  86 }
  87 EXPORT_SYMBOL(rtnl_trylock);
  88
  89 int rtnl_is_locked(void)
  90 {
  91         return mutex_is_locked(&rtnl_mutex);
  92 }
  93 EXPORT_SYMBOL(rtnl_is_locked);
  94
  95 #ifdef CONFIG_PROVE_LOCKING
  96 int lockdep_rtnl_is_held(void)
  97 {
  98         return lockdep_is_held(&rtnl_mutex);
  99 }
 100 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 101 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 102
 103 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 104
 105 static inline int rtm_msgindex(int msgtype)
 106 {
 107         int msgindex = msgtype - RTM_BASE;
 108
 109         /*
 110          * msgindex < 0 implies someone tried to register a netlink
 111          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 112          * the message type has not been added to linux/rtnetlink.h
 113          */
 114         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 115
 116         return msgindex;
 117 }
 118
 119 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
 120 {
 121         struct rtnl_link *tab;
 122
 123         if (protocol <= RTNL_FAMILY_MAX)
 124                 tab = rtnl_msg_handlers[protocol];
 125         else
 126                 tab = NULL;
 127
 128         if (tab == NULL || tab[msgindex].doit == NULL)
 129                 tab = rtnl_msg_handlers[PF_UNSPEC];
 130
 131         return tab[msgindex].doit;
 132 }
 133
 134 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
 135 {
 136         struct rtnl_link *tab;
 137
 138         if (protocol <= RTNL_FAMILY_MAX)
 139                 tab = rtnl_msg_handlers[protocol];
 140         else
 141                 tab = NULL;
 142
 143         if (tab == NULL || tab[msgindex].dumpit == NULL)
 144                 tab = rtnl_msg_handlers[PF_UNSPEC];
 145
 146         return tab[msgindex].dumpit;
 147 }
 148
 149 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
 150 {
 151         struct rtnl_link *tab;
 152
 153         if (protocol <= RTNL_FAMILY_MAX)
 154                 tab = rtnl_msg_handlers[protocol];
 155         else
 156                 tab = NULL;
 157
 158         if (tab == NULL || tab[msgindex].calcit == NULL)
 159                 tab = rtnl_msg_handlers[PF_UNSPEC];
 160
 161         return tab[msgindex].calcit;
 162 }
 163
 164 /**
 165  * __rtnl_register - Register a rtnetlink message type
 166  * @protocol: Protocol family or PF_UNSPEC
 167  * @msgtype: rtnetlink message type
 168  * @doit: Function pointer called for each request message
 169  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 170  * @calcit: Function pointer to calc size of dump message
 171  *
 172  * Registers the specified function pointers (at least one of them has
 173  * to be non-NULL) to be called whenever a request message for the
 174  * specified protocol family and message type is received.
 175  *
 176  * The special protocol family PF_UNSPEC may be used to define fallback
 177  * function pointers for the case when no entry for the specific protocol
 178  * family exists.
 179  *
 180  * Returns 0 on success or a negative error code.
 181  */
 182 int __rtnl_register(int protocol, int msgtype,
 183                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 184                     rtnl_calcit_func calcit)
 185 {
 186         struct rtnl_link *tab;
 187         int msgindex;
 188
 189         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 190         msgindex = rtm_msgindex(msgtype);
 191
 192         tab = rtnl_msg_handlers[protocol];
 193         if (tab == NULL) {
 194                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
 195                 if (tab == NULL)
 196                         return -ENOBUFS;
 197
 198                 rtnl_msg_handlers[protocol] = tab;
 199         }
 200
 201         if (doit)
 202                 tab[msgindex].doit = doit;
 203
 204         if (dumpit)
 205                 tab[msgindex].dumpit = dumpit;
 206
 207         if (calcit)
 208                 tab[msgindex].calcit = calcit;
 209
 210         return 0;
 211 }
 212 EXPORT_SYMBOL_GPL(__rtnl_register);
 213
 214 /**
 215  * rtnl_register - Register a rtnetlink message type
 216  *
 217  * Identical to __rtnl_register() but panics on failure. This is useful
 218  * as failure of this function is very unlikely, it can only happen due
 219  * to lack of memory when allocating the chain to store all message
 220  * handlers for a protocol. Meant for use in init functions where lack
 221  * of memory implies no sense in continuing.
 222  */
 223 void rtnl_register(int protocol, int msgtype,
 224                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 225                    rtnl_calcit_func calcit)
 226 {
 227         if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
 228                 panic("Unable to register rtnetlink message handler, "
 229                       "protocol = %d, message type = %d\n",
 230                       protocol, msgtype);
 231 }
 232 EXPORT_SYMBOL_GPL(rtnl_register);
 233
 234 /**
 235  * rtnl_unregister - Unregister a rtnetlink message type
 236  * @protocol: Protocol family or PF_UNSPEC
 237  * @msgtype: rtnetlink message type
 238  *
 239  * Returns 0 on success or a negative error code.
 240  */
 241 int rtnl_unregister(int protocol, int msgtype)
 242 {
 243         int msgindex;
 244
 245         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 246         msgindex = rtm_msgindex(msgtype);
 247
 248         if (rtnl_msg_handlers[protocol] == NULL)
 249                 return -ENOENT;
 250
 251         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
 252         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
 253
 254         return 0;
 255 }
 256 EXPORT_SYMBOL_GPL(rtnl_unregister);
 257
 258 /**
 259  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 260  * @protocol : Protocol family or PF_UNSPEC
 261  *
 262  * Identical to calling rtnl_unregster() for all registered message types
 263  * of a certain protocol family.
 264  */
 265 void rtnl_unregister_all(int protocol)
 266 {
 267         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 268
 269         kfree(rtnl_msg_handlers[protocol]);
 270         rtnl_msg_handlers[protocol] = NULL;
 271 }
 272 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 273
 274 static LIST_HEAD(link_ops);
 275
 276 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 277 {
 278         const struct rtnl_link_ops *ops;
 279
 280         list_for_each_entry(ops, &link_ops, list) {
 281                 if (!strcmp(ops->kind, kind))
 282                         return ops;
 283         }
 284         return NULL;
 285 }
 286
 287 /**
 288  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 289  * @ops: struct rtnl_link_ops * to register
 290  *
 291  * The caller must hold the rtnl_mutex. This function should be used
 292  * by drivers that create devices during module initialization. It
 293  * must be called before registering the devices.
 294  *
 295  * Returns 0 on success or a negative error code.
 296  */
 297 int __rtnl_link_register(struct rtnl_link_ops *ops)
 298 {
 299         if (rtnl_link_ops_get(ops->kind))
 300                 return -EEXIST;
 301
 302         /* The check for setup is here because if ops
 303          * does not have that filled up, it is not possible
 304          * to use the ops for creating device. So do not
 305          * fill up dellink as well. That disables rtnl_dellink.
 306          */
 307         if (ops->setup && !ops->dellink)
 308                 ops->dellink = unregister_netdevice_queue;
 309
 310         list_add_tail(&ops->list, &link_ops);
 311         return 0;
 312 }
 313 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 314
 315 /**
 316  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 317  * @ops: struct rtnl_link_ops * to register
 318  *
 319  * Returns 0 on success or a negative error code.
 320  */
 321 int rtnl_link_register(struct rtnl_link_ops *ops)
 322 {
 323         int err;
 324
 325         rtnl_lock();
 326         err = __rtnl_link_register(ops);
 327         rtnl_unlock();
 328         return err;
 329 }
 330 EXPORT_SYMBOL_GPL(rtnl_link_register);
 331
 332 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 333 {
 334         struct net_device *dev;
 335         LIST_HEAD(list_kill);
 336
 337         for_each_netdev(net, dev) {
 338                 if (dev->rtnl_link_ops == ops)
 339                         ops->dellink(dev, &list_kill);
 340         }
 341         unregister_netdevice_many(&list_kill);
 342 }
 343
 344 /**
 345  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 346  * @ops: struct rtnl_link_ops * to unregister
 347  *
 348  * The caller must hold the rtnl_mutex.
 349  */
 350 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 351 {
 352         struct net *net;
 353
 354         for_each_net(net) {
 355                 __rtnl_kill_links(net, ops);
 356         }
 357         list_del(&ops->list);
 358 }
 359 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 360
 361 /* Return with the rtnl_lock held when there are no network
 362  * devices unregistering in any network namespace.
 363  */
 364 static void rtnl_lock_unregistering_all(void)
 365 {
 366         struct net *net;
 367         bool unregistering;
 368         DEFINE_WAIT(wait);
 369
 370         for (;;) {
 371                 prepare_to_wait(&netdev_unregistering_wq, &wait,
 372                                 TASK_UNINTERRUPTIBLE);
 373                 unregistering = false;
 374                 rtnl_lock();
 375                 for_each_net(net) {
 376                         if (net->dev_unreg_count > 0) {
 377                                 unregistering = true;
 378                                 break;
 379                         }
 380                 }
 381                 if (!unregistering)
 382                         break;
 383                 __rtnl_unlock();
 384                 schedule();
 385         }
 386         finish_wait(&netdev_unregistering_wq, &wait);
 387 }
 388
 389 /**
 390  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 391  * @ops: struct rtnl_link_ops * to unregister
 392  */
 393 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 394 {
 395         /* Close the race with cleanup_net() */
 396         mutex_lock(&net_mutex);
 397         rtnl_lock_unregistering_all();
 398         __rtnl_link_unregister(ops);
 399         rtnl_unlock();
 400         mutex_unlock(&net_mutex);
 401 }
 402 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 403
 404 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 405 {
 406         struct net_device *master_dev;
 407         const struct rtnl_link_ops *ops;
 408
 409         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 410         if (!master_dev)
 411                 return 0;
 412         ops = master_dev->rtnl_link_ops;
 413         if (!ops || !ops->get_slave_size)
 414                 return 0;
 415         /* IFLA_INFO_SLAVE_DATA + nested data */
 416         return nla_total_size(sizeof(struct nlattr)) +
 417                ops->get_slave_size(master_dev, dev);
 418 }
 419
 420 static size_t rtnl_link_get_size(const struct net_device *dev)
 421 {
 422         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 423         size_t size;
 424
 425         if (!ops)
 426                 return 0;
 427
 428         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 429                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 430
 431         if (ops->get_size)
 432                 /* IFLA_INFO_DATA + nested data */
 433                 size += nla_total_size(sizeof(struct nlattr)) +
 434                         ops->get_size(dev);
 435
 436         if (ops->get_xstats_size)
 437                 /* IFLA_INFO_XSTATS */
 438                 size += nla_total_size(ops->get_xstats_size(dev));
 439
 440         size += rtnl_link_get_slave_info_data_size(dev);
 441
 442         return size;
 443 }
 444
 445 static LIST_HEAD(rtnl_af_ops);
 446
 447 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 448 {
 449         const struct rtnl_af_ops *ops;
 450
 451         list_for_each_entry(ops, &rtnl_af_ops, list) {
 452                 if (ops->family == family)
 453                         return ops;
 454         }
 455
 456         return NULL;
 457 }
 458
 459 /**
 460  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 461  * @ops: struct rtnl_af_ops * to register
 462  *
 463  * Returns 0 on success or a negative error code.
 464  */
 465 void rtnl_af_register(struct rtnl_af_ops *ops)
 466 {
 467         rtnl_lock();
 468         list_add_tail(&ops->list, &rtnl_af_ops);
 469         rtnl_unlock();
 470 }
 471 EXPORT_SYMBOL_GPL(rtnl_af_register);
 472
 473 /**
 474  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 475  * @ops: struct rtnl_af_ops * to unregister
 476  *
 477  * The caller must hold the rtnl_mutex.
 478  */
 479 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 480 {
 481         list_del(&ops->list);
 482 }
 483 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 484
 485 /**
 486  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 487  * @ops: struct rtnl_af_ops * to unregister
 488  */
 489 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 490 {
 491         rtnl_lock();
 492         __rtnl_af_unregister(ops);
 493         rtnl_unlock();
 494 }
 495 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 496
 497 static size_t rtnl_link_get_af_size(const struct net_device *dev)
 498 {
 499         struct rtnl_af_ops *af_ops;
 500         size_t size;
 501
 502         /* IFLA_AF_SPEC */
 503         size = nla_total_size(sizeof(struct nlattr));
 504
 505         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 506                 if (af_ops->get_link_af_size) {
 507                         /* AF_* + nested data */
 508                         size += nla_total_size(sizeof(struct nlattr)) +
 509                                 af_ops->get_link_af_size(dev);
 510                 }
 511         }
 512
 513         return size;
 514 }
 515
 516 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 517 {
 518         struct net_device *master_dev;
 519
 520         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 521         if (master_dev && master_dev->rtnl_link_ops)
 522                 return true;
 523         return false;
 524 }
 525
 526 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 527                                      const struct net_device *dev)
 528 {
 529         struct net_device *master_dev;
 530         const struct rtnl_link_ops *ops;
 531         struct nlattr *slave_data;
 532         int err;
 533
 534         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 535         if (!master_dev)
 536                 return 0;
 537         ops = master_dev->rtnl_link_ops;
 538         if (!ops)
 539                 return 0;
 540         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 541                 return -EMSGSIZE;
 542         if (ops->fill_slave_info) {
 543                 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
 544                 if (!slave_data)
 545                         return -EMSGSIZE;
 546                 err = ops->fill_slave_info(skb, master_dev, dev);
 547                 if (err < 0)
 548                         goto err_cancel_slave_data;
 549                 nla_nest_end(skb, slave_data);
 550         }
 551         return 0;
 552
 553 err_cancel_slave_data:
 554         nla_nest_cancel(skb, slave_data);
 555         return err;
 556 }
 557
 558 static int rtnl_link_info_fill(struct sk_buff *skb,
 559                                const struct net_device *dev)
 560 {
 561         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 562         struct nlattr *data;
 563         int err;
 564
 565         if (!ops)
 566                 return 0;
 567         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 568                 return -EMSGSIZE;
 569         if (ops->fill_xstats) {
 570                 err = ops->fill_xstats(skb, dev);
 571                 if (err < 0)
 572                         return err;
 573         }
 574         if (ops->fill_info) {
 575                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 576                 if (data == NULL)
 577                         return -EMSGSIZE;
 578                 err = ops->fill_info(skb, dev);
 579                 if (err < 0)
 580                         goto err_cancel_data;
 581                 nla_nest_end(skb, data);
 582         }
 583         return 0;
 584
 585 err_cancel_data:
 586         nla_nest_cancel(skb, data);
 587         return err;
 588 }
 589
 590 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 591 {
 592         struct nlattr *linkinfo;
 593         int err = -EMSGSIZE;
 594
 595         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 596         if (linkinfo == NULL)
 597                 goto out;
 598
 599         err = rtnl_link_info_fill(skb, dev);
 600         if (err < 0)
 601                 goto err_cancel_link;
 602
 603         err = rtnl_link_slave_info_fill(skb, dev);
 604         if (err < 0)
 605                 goto err_cancel_link;
 606
 607         nla_nest_end(skb, linkinfo);
 608         return 0;
 609
 610 err_cancel_link:
 611         nla_nest_cancel(skb, linkinfo);
 612 out:
 613         return err;
 614 }
 615
 616 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 617 {
 618         struct sock *rtnl = net->rtnl;
 619         int err = 0;
 620
 621         NETLINK_CB(skb).dst_group = group;
 622         if (echo)
 623                 atomic_inc(&skb->users);
 624         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 625         if (echo)
 626                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 627         return err;
 628 }
 629
 630 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 631 {
 632         struct sock *rtnl = net->rtnl;
 633
 634         return nlmsg_unicast(rtnl, skb, pid);
 635 }
 636 EXPORT_SYMBOL(rtnl_unicast);
 637
 638 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 639                  struct nlmsghdr *nlh, gfp_t flags)
 640 {
 641         struct sock *rtnl = net->rtnl;
 642         int report = 0;
 643
 644         if (nlh)
 645                 report = nlmsg_report(nlh);
 646
 647         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 648 }
 649 EXPORT_SYMBOL(rtnl_notify);
 650
 651 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 652 {
 653         struct sock *rtnl = net->rtnl;
 654
 655         netlink_set_err(rtnl, 0, group, error);
 656 }
 657 EXPORT_SYMBOL(rtnl_set_sk_err);
 658
 659 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 660 {
 661         struct nlattr *mx;
 662         int i, valid = 0;
 663
 664         mx = nla_nest_start(skb, RTA_METRICS);
 665         if (mx == NULL)
 666                 return -ENOBUFS;
 667
 668         for (i = 0; i < RTAX_MAX; i++) {
 669                 if (metrics[i]) {
 670                         valid++;
 671                         if (nla_put_u32(skb, i+1, metrics[i]))
 672                                 goto nla_put_failure;
 673                 }
 674         }
 675
 676         if (!valid) {
 677                 nla_nest_cancel(skb, mx);
 678                 return 0;
 679         }
 680
 681         return nla_nest_end(skb, mx);
 682
 683 nla_put_failure:
 684         nla_nest_cancel(skb, mx);
 685         return -EMSGSIZE;
 686 }
 687 EXPORT_SYMBOL(rtnetlink_put_metrics);
 688
 689 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 690                        long expires, u32 error)
 691 {
 692         struct rta_cacheinfo ci = {
 693                 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
 694                 .rta_used = dst->__use,
 695                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 696                 .rta_error = error,
 697                 .rta_id =  id,
 698         };
 699
 700         if (expires) {
 701                 unsigned long clock;
 702
 703                 clock = jiffies_to_clock_t(abs(expires));
 704                 clock = min_t(unsigned long, clock, INT_MAX);
 705                 ci.rta_expires = (expires > 0) ? clock : -clock;
 706         }
 707         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 708 }
 709 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 710
 711 static void set_operstate(struct net_device *dev, unsigned char transition)
 712 {
 713         unsigned char operstate = dev->operstate;
 714
 715         switch (transition) {
 716         case IF_OPER_UP:
 717                 if ((operstate == IF_OPER_DORMANT ||
 718                      operstate == IF_OPER_UNKNOWN) &&
 719                     !netif_dormant(dev))
 720                         operstate = IF_OPER_UP;
 721                 break;
 722
 723         case IF_OPER_DORMANT:
 724                 if (operstate == IF_OPER_UP ||
 725                     operstate == IF_OPER_UNKNOWN)
 726                         operstate = IF_OPER_DORMANT;
 727                 break;
 728         }
 729
 730         if (dev->operstate != operstate) {
 731                 write_lock_bh(&dev_base_lock);
 732                 dev->operstate = operstate;
 733                 write_unlock_bh(&dev_base_lock);
 734                 netdev_state_change(dev);
 735         }
 736 }
 737
 738 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 739 {
 740         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 741                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 742 }
 743
 744 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 745                                            const struct ifinfomsg *ifm)
 746 {
 747         unsigned int flags = ifm->ifi_flags;
 748
 749         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 750         if (ifm->ifi_change)
 751                 flags = (flags & ifm->ifi_change) |
 752                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 753
 754         return flags;
 755 }
 756
 757 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 758                                  const struct rtnl_link_stats64 *b)
 759 {
 760         a->rx_packets = b->rx_packets;
 761         a->tx_packets = b->tx_packets;
 762         a->rx_bytes = b->rx_bytes;
 763         a->tx_bytes = b->tx_bytes;
 764         a->rx_errors = b->rx_errors;
 765         a->tx_errors = b->tx_errors;
 766         a->rx_dropped = b->rx_dropped;
 767         a->tx_dropped = b->tx_dropped;
 768
 769         a->multicast = b->multicast;
 770         a->collisions = b->collisions;
 771
 772         a->rx_length_errors = b->rx_length_errors;
 773         a->rx_over_errors = b->rx_over_errors;
 774         a->rx_crc_errors = b->rx_crc_errors;
 775         a->rx_frame_errors = b->rx_frame_errors;
 776         a->rx_fifo_errors = b->rx_fifo_errors;
 777         a->rx_missed_errors = b->rx_missed_errors;
 778
 779         a->tx_aborted_errors = b->tx_aborted_errors;
 780         a->tx_carrier_errors = b->tx_carrier_errors;
 781         a->tx_fifo_errors = b->tx_fifo_errors;
 782         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 783         a->tx_window_errors = b->tx_window_errors;
 784
 785         a->rx_compressed = b->rx_compressed;
 786         a->tx_compressed = b->tx_compressed;
 787 }
 788
 789 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
 790 {
 791         memcpy(v, b, sizeof(*b));
 792 }
 793
 794 /* All VF info */
 795 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 796                                    u32 ext_filter_mask)
 797 {
 798         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
 799             (ext_filter_mask & RTEXT_FILTER_VF)) {
 800                 int num_vfs = dev_num_vf(dev->dev.parent);
 801                 size_t size = nla_total_size(sizeof(struct nlattr));
 802                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 803                 size += num_vfs *
 804                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 805                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 806                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 807                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 808                          nla_total_size(sizeof(struct ifla_vf_link_state)));
 809                 return size;
 810         } else
 811                 return 0;
 812 }
 813
 814 static size_t rtnl_port_size(const struct net_device *dev,
 815                              u32 ext_filter_mask)
 816 {
 817         size_t port_size = nla_total_size(4)            /* PORT_VF */
 818                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 819                 + nla_total_size(sizeof(struct ifla_port_vsi))
 820                                                         /* PORT_VSI_TYPE */
 821                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 822                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 823                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 824                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 825         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 826         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 827                 + port_size;
 828         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 829                 + port_size;
 830
 831         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 832             !(ext_filter_mask & RTEXT_FILTER_VF))
 833                 return 0;
 834         if (dev_num_vf(dev->dev.parent))
 835                 return port_self_size + vf_ports_size +
 836                         vf_port_size * dev_num_vf(dev->dev.parent);
 837         else
 838                 return port_self_size;
 839 }
 840
 841 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 842                                      u32 ext_filter_mask)
 843 {
 844         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 845                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 846                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 847                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 848                + nla_total_size(sizeof(struct rtnl_link_ifmap))
 849                + nla_total_size(sizeof(struct rtnl_link_stats))
 850                + nla_total_size(sizeof(struct rtnl_link_stats64))
 851                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 852                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 853                + nla_total_size(4) /* IFLA_TXQLEN */
 854                + nla_total_size(4) /* IFLA_WEIGHT */
 855                + nla_total_size(4) /* IFLA_MTU */
 856                + nla_total_size(4) /* IFLA_LINK */
 857                + nla_total_size(4) /* IFLA_MASTER */
 858                + nla_total_size(1) /* IFLA_CARRIER */
 859                + nla_total_size(4) /* IFLA_PROMISCUITY */
 860                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
 861                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 862                + nla_total_size(1) /* IFLA_OPERSTATE */
 863                + nla_total_size(1) /* IFLA_LINKMODE */
 864                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
 865                + nla_total_size(ext_filter_mask
 866                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 867                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 868                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 869                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 870                + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
 871                + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */
 872 }
 873
 874 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 875 {
 876         struct nlattr *vf_ports;
 877         struct nlattr *vf_port;
 878         int vf;
 879         int err;
 880
 881         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 882         if (!vf_ports)
 883                 return -EMSGSIZE;
 884
 885         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 886                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 887                 if (!vf_port)
 888                         goto nla_put_failure;
 889                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
 890                         goto nla_put_failure;
 891                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 892                 if (err == -EMSGSIZE)
 893                         goto nla_put_failure;
 894                 if (err) {
 895                         nla_nest_cancel(skb, vf_port);
 896                         continue;
 897                 }
 898                 nla_nest_end(skb, vf_port);
 899         }
 900
 901         nla_nest_end(skb, vf_ports);
 902
 903         return 0;
 904
 905 nla_put_failure:
 906         nla_nest_cancel(skb, vf_ports);
 907         return -EMSGSIZE;
 908 }
 909
 910 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 911 {
 912         struct nlattr *port_self;
 913         int err;
 914
 915         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 916         if (!port_self)
 917                 return -EMSGSIZE;
 918
 919         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 920         if (err) {
 921                 nla_nest_cancel(skb, port_self);
 922                 return (err == -EMSGSIZE) ? err : 0;
 923         }
 924
 925         nla_nest_end(skb, port_self);
 926
 927         return 0;
 928 }
 929
 930 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
 931                           u32 ext_filter_mask)
 932 {
 933         int err;
 934
 935         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 936             !(ext_filter_mask & RTEXT_FILTER_VF))
 937                 return 0;
 938
 939         err = rtnl_port_self_fill(skb, dev);
 940         if (err)
 941                 return err;
 942
 943         if (dev_num_vf(dev->dev.parent)) {
 944                 err = rtnl_vf_ports_fill(skb, dev);
 945                 if (err)
 946                         return err;
 947         }
 948
 949         return 0;
 950 }
 951
 952 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
 953 {
 954         int err;
 955         struct netdev_phys_port_id ppid;
 956
 957         err = dev_get_phys_port_id(dev, &ppid);
 958         if (err) {
 959                 if (err == -EOPNOTSUPP)
 960                         return 0;
 961                 return err;
 962         }
 963
 964         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
 965                 return -EMSGSIZE;
 966
 967         return 0;
 968 }
 969
 970 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 971                             int type, u32 pid, u32 seq, u32 change,
 972                             unsigned int flags, u32 ext_filter_mask)
 973 {
 974         struct ifinfomsg *ifm;
 975         struct nlmsghdr *nlh;
 976         struct rtnl_link_stats64 temp;
 977         const struct rtnl_link_stats64 *stats;
 978         struct nlattr *attr, *af_spec;
 979         struct rtnl_af_ops *af_ops;
 980         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
 981
 982         ASSERT_RTNL();
 983         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 984         if (nlh == NULL)
 985                 return -EMSGSIZE;
 986
 987         ifm = nlmsg_data(nlh);
 988         ifm->ifi_family = AF_UNSPEC;
 989         ifm->__ifi_pad = 0;
 990         ifm->ifi_type = dev->type;
 991         ifm->ifi_index = dev->ifindex;
 992         ifm->ifi_flags = dev_get_flags(dev);
 993         ifm->ifi_change = change;
 994
 995         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
 996             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
 997             nla_put_u8(skb, IFLA_OPERSTATE,
 998                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
 999             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1000             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1001             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1002             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1003             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1004 #ifdef CONFIG_RPS
1005             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1006 #endif
1007             (dev->ifindex != dev->iflink &&
1008              nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
1009             (upper_dev &&
1010              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1011             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1012             (dev->qdisc &&
1013              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1014             (dev->ifalias &&
1015              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1016             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1017                         atomic_read(&dev->carrier_changes)))
1018                 goto nla_put_failure;
1019
1020         if (1) {
1021                 struct rtnl_link_ifmap map = {
1022                         .mem_start   = dev->mem_start,
1023                         .mem_end     = dev->mem_end,
1024                         .base_addr   = dev->base_addr,
1025                         .irq         = dev->irq,
1026                         .dma         = dev->dma,
1027                         .port        = dev->if_port,
1028                 };
1029                 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1030                         goto nla_put_failure;
1031         }
1032
1033         if (dev->addr_len) {
1034                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1035                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1036                         goto nla_put_failure;
1037         }
1038
1039         if (rtnl_phys_port_id_fill(skb, dev))
1040                 goto nla_put_failure;
1041
1042         attr = nla_reserve(skb, IFLA_STATS,
1043                         sizeof(struct rtnl_link_stats));
1044         if (attr == NULL)
1045                 goto nla_put_failure;
1046
1047         stats = dev_get_stats(dev, &temp);
1048         copy_rtnl_link_stats(nla_data(attr), stats);
1049
1050         attr = nla_reserve(skb, IFLA_STATS64,
1051                         sizeof(struct rtnl_link_stats64));
1052         if (attr == NULL)
1053                 goto nla_put_failure;
1054         copy_rtnl_link_stats64(nla_data(attr), stats);
1055
1056         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1057             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1058                 goto nla_put_failure;
1059
1060         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1061             && (ext_filter_mask & RTEXT_FILTER_VF)) {
1062                 int i;
1063
1064                 struct nlattr *vfinfo, *vf;
1065                 int num_vfs = dev_num_vf(dev->dev.parent);
1066
1067                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1068                 if (!vfinfo)
1069                         goto nla_put_failure;
1070                 for (i = 0; i < num_vfs; i++) {
1071                         struct ifla_vf_info ivi;
1072                         struct ifla_vf_mac vf_mac;
1073                         struct ifla_vf_vlan vf_vlan;
1074                         struct ifla_vf_rate vf_rate;
1075                         struct ifla_vf_tx_rate vf_tx_rate;
1076                         struct ifla_vf_spoofchk vf_spoofchk;
1077                         struct ifla_vf_link_state vf_linkstate;
1078
1079                         /*
1080                          * Not all SR-IOV capable drivers support the
1081                          * spoofcheck query.  Preset to -1 so the user
1082                          * space tool can detect that the driver didn't
1083                          * report anything.
1084                          */
1085                         ivi.spoofchk = -1;
1086                         memset(ivi.mac, 0, sizeof(ivi.mac));
1087                         /* The default value for VF link state is "auto"
1088                          * IFLA_VF_LINK_STATE_AUTO which equals zero
1089                          */
1090                         ivi.linkstate = 0;
1091                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1092                                 break;
1093                         vf_mac.vf =
1094                                 vf_vlan.vf =
1095                                 vf_rate.vf =
1096                                 vf_tx_rate.vf =
1097                                 vf_spoofchk.vf =
1098                                 vf_linkstate.vf = ivi.vf;
1099
1100                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1101                         vf_vlan.vlan = ivi.vlan;
1102                         vf_vlan.qos = ivi.qos;
1103                         vf_tx_rate.rate = ivi.max_tx_rate;
1104                         vf_rate.min_tx_rate = ivi.min_tx_rate;
1105                         vf_rate.max_tx_rate = ivi.max_tx_rate;
1106                         vf_spoofchk.setting = ivi.spoofchk;
1107                         vf_linkstate.link_state = ivi.linkstate;
1108                         vf = nla_nest_start(skb, IFLA_VF_INFO);
1109                         if (!vf) {
1110                                 nla_nest_cancel(skb, vfinfo);
1111                                 goto nla_put_failure;
1112                         }
1113                         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1114                             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1115                             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1116                                     &vf_rate) ||
1117                             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1118                                     &vf_tx_rate) ||
1119                             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1120                                     &vf_spoofchk) ||
1121                             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1122                                     &vf_linkstate))
1123                                 goto nla_put_failure;
1124                         nla_nest_end(skb, vf);
1125                 }
1126                 nla_nest_end(skb, vfinfo);
1127         }
1128
1129         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1130                 goto nla_put_failure;
1131
1132         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1133                 if (rtnl_link_fill(skb, dev) < 0)
1134                         goto nla_put_failure;
1135         }
1136
1137         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1138                 goto nla_put_failure;
1139
1140         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1141                 if (af_ops->fill_link_af) {
1142                         struct nlattr *af;
1143                         int err;
1144
1145                         if (!(af = nla_nest_start(skb, af_ops->family)))
1146                                 goto nla_put_failure;
1147
1148                         err = af_ops->fill_link_af(skb, dev);
1149
1150                         /*
1151                          * Caller may return ENODATA to indicate that there
1152                          * was no data to be dumped. This is not an error, it
1153                          * means we should trim the attribute header and
1154                          * continue.
1155                          */
1156                         if (err == -ENODATA)
1157                                 nla_nest_cancel(skb, af);
1158                         else if (err < 0)
1159                                 goto nla_put_failure;
1160
1161                         nla_nest_end(skb, af);
1162                 }
1163         }
1164
1165         nla_nest_end(skb, af_spec);
1166
1167         return nlmsg_end(skb, nlh);
1168
1169 nla_put_failure:
1170         nlmsg_cancel(skb, nlh);
1171         return -EMSGSIZE;
1172 }
1173
1174 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1175         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1176         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1177         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1178         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1179         [IFLA_MTU]              = { .type = NLA_U32 },
1180         [IFLA_LINK]             = { .type = NLA_U32 },
1181         [IFLA_MASTER]           = { .type = NLA_U32 },
1182         [IFLA_CARRIER]          = { .type = NLA_U8 },
1183         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1184         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1185         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1186         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1187         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1188         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1189         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1190         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1191         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1192         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1193         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1194         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1195         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1196         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1197         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1198         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1199         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
1200         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1201 };
1202
1203 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1204         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1205         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1206         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1207         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1208 };
1209
1210 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1211         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1212 };
1213
1214 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1215         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1216                                     .len = sizeof(struct ifla_vf_mac) },
1217         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1218                                     .len = sizeof(struct ifla_vf_vlan) },
1219         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1220                                     .len = sizeof(struct ifla_vf_tx_rate) },
1221         [IFLA_VF_SPOOFCHK]      = { .type = NLA_BINARY,
1222                                     .len = sizeof(struct ifla_vf_spoofchk) },
1223         [IFLA_VF_RATE]          = { .type = NLA_BINARY,
1224                                     .len = sizeof(struct ifla_vf_rate) },
1225         [IFLA_VF_LINK_STATE]    = { .type = NLA_BINARY,
1226                                     .len = sizeof(struct ifla_vf_link_state) },
1227 };
1228
1229 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1230         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1231         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1232                                     .len = PORT_PROFILE_MAX },
1233         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1234                                     .len = sizeof(struct ifla_port_vsi)},
1235         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1236                                       .len = PORT_UUID_MAX },
1237         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1238                                     .len = PORT_UUID_MAX },
1239         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1240         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1241 };
1242
1243 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1244 {
1245         struct net *net = sock_net(skb->sk);
1246         int h, s_h;
1247         int idx = 0, s_idx;
1248         struct net_device *dev;
1249         struct hlist_head *head;
1250         struct nlattr *tb[IFLA_MAX+1];
1251         u32 ext_filter_mask = 0;
1252         int err;
1253         int hdrlen;
1254
1255         s_h = cb->args[0];
1256         s_idx = cb->args[1];
1257
1258         rcu_read_lock();
1259         cb->seq = net->dev_base_seq;
1260
1261         /* A hack to preserve kernel<->userspace interface.
1262          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1263          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1264          * what iproute2 < v3.9.0 used.
1265          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1266          * attribute, its netlink message is shorter than struct ifinfomsg.
1267          */
1268         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1269                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1270
1271         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1272
1273                 if (tb[IFLA_EXT_MASK])
1274                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1275         }
1276
1277         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1278                 idx = 0;
1279                 head = &net->dev_index_head[h];
1280                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1281                         if (idx < s_idx)
1282                                 goto cont;
1283                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1284                                                NETLINK_CB(cb->skb).portid,
1285                                                cb->nlh->nlmsg_seq, 0,
1286                                                NLM_F_MULTI,
1287                                                ext_filter_mask);
1288                         /* If we ran out of room on the first message,
1289                          * we're in trouble
1290                          */
1291                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1292
1293                         if (err <= 0)
1294                                 goto out;
1295
1296                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1297 cont:
1298                         idx++;
1299                 }
1300         }
1301 out:
1302         rcu_read_unlock();
1303         cb->args[1] = idx;
1304         cb->args[0] = h;
1305
1306         return skb->len;
1307 }
1308
1309 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1310 {
1311         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1312 }
1313 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1314
1315 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1316 {
1317         struct net *net;
1318         /* Examine the link attributes and figure out which
1319          * network namespace we are talking about.
1320          */
1321         if (tb[IFLA_NET_NS_PID])
1322                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1323         else if (tb[IFLA_NET_NS_FD])
1324                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1325         else
1326                 net = get_net(src_net);
1327         return net;
1328 }
1329 EXPORT_SYMBOL(rtnl_link_get_net);
1330
1331 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1332 {
1333         if (dev) {
1334                 if (tb[IFLA_ADDRESS] &&
1335                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1336                         return -EINVAL;
1337
1338                 if (tb[IFLA_BROADCAST] &&
1339                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1340                         return -EINVAL;
1341         }
1342
1343         if (tb[IFLA_AF_SPEC]) {
1344                 struct nlattr *af;
1345                 int rem, err;
1346
1347                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1348                         const struct rtnl_af_ops *af_ops;
1349
1350                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1351                                 return -EAFNOSUPPORT;
1352
1353                         if (!af_ops->set_link_af)
1354                                 return -EOPNOTSUPP;
1355
1356                         if (af_ops->validate_link_af) {
1357                                 err = af_ops->validate_link_af(dev, af);
1358                                 if (err < 0)
1359                                         return err;
1360                         }
1361                 }
1362         }
1363
1364         return 0;
1365 }
1366
1367 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1368 {
1369         int rem, err = -EINVAL;
1370         struct nlattr *vf;
1371         const struct net_device_ops *ops = dev->netdev_ops;
1372
1373         nla_for_each_nested(vf, attr, rem) {
1374                 switch (nla_type(vf)) {
1375                 case IFLA_VF_MAC: {
1376                         struct ifla_vf_mac *ivm;
1377                         ivm = nla_data(vf);
1378                         err = -EOPNOTSUPP;
1379                         if (ops->ndo_set_vf_mac)
1380                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1381                                                           ivm->mac);
1382                         break;
1383                 }
1384                 case IFLA_VF_VLAN: {
1385                         struct ifla_vf_vlan *ivv;
1386                         ivv = nla_data(vf);
1387                         err = -EOPNOTSUPP;
1388                         if (ops->ndo_set_vf_vlan)
1389                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1390                                                            ivv->vlan,
1391                                                            ivv->qos);
1392                         break;
1393                 }
1394                 case IFLA_VF_TX_RATE: {
1395                         struct ifla_vf_tx_rate *ivt;
1396                         struct ifla_vf_info ivf;
1397                         ivt = nla_data(vf);
1398                         err = -EOPNOTSUPP;
1399                         if (ops->ndo_get_vf_config)
1400                                 err = ops->ndo_get_vf_config(dev, ivt->vf,
1401                                                              &ivf);
1402                         if (err)
1403                                 break;
1404                         err = -EOPNOTSUPP;
1405                         if (ops->ndo_set_vf_rate)
1406                                 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1407                                                            ivf.min_tx_rate,
1408                                                            ivt->rate);
1409                         break;
1410                 }
1411                 case IFLA_VF_RATE: {
1412                         struct ifla_vf_rate *ivt;
1413                         ivt = nla_data(vf);
1414                         err = -EOPNOTSUPP;
1415                         if (ops->ndo_set_vf_rate)
1416                                 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1417                                                            ivt->min_tx_rate,
1418                                                            ivt->max_tx_rate);
1419                         break;
1420                 }
1421                 case IFLA_VF_SPOOFCHK: {
1422                         struct ifla_vf_spoofchk *ivs;
1423                         ivs = nla_data(vf);
1424                         err = -EOPNOTSUPP;
1425                         if (ops->ndo_set_vf_spoofchk)
1426                                 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1427                                                                ivs->setting);
1428                         break;
1429                 }
1430                 case IFLA_VF_LINK_STATE: {
1431                         struct ifla_vf_link_state *ivl;
1432                         ivl = nla_data(vf);
1433                         err = -EOPNOTSUPP;
1434                         if (ops->ndo_set_vf_link_state)
1435                                 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1436                                                                  ivl->link_state);
1437                         break;
1438                 }
1439                 default:
1440                         err = -EINVAL;
1441                         break;
1442                 }
1443                 if (err)
1444                         break;
1445         }
1446         return err;
1447 }
1448
1449 static int do_set_master(struct net_device *dev, int ifindex)
1450 {
1451         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1452         const struct net_device_ops *ops;
1453         int err;
1454
1455         if (upper_dev) {
1456                 if (upper_dev->ifindex == ifindex)
1457                         return 0;
1458                 ops = upper_dev->netdev_ops;
1459                 if (ops->ndo_del_slave) {
1460                         err = ops->ndo_del_slave(upper_dev, dev);
1461                         if (err)
1462                                 return err;
1463                 } else {
1464                         return -EOPNOTSUPP;
1465                 }
1466         }
1467
1468         if (ifindex) {
1469                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1470                 if (!upper_dev)
1471                         return -EINVAL;
1472                 ops = upper_dev->netdev_ops;
1473                 if (ops->ndo_add_slave) {
1474                         err = ops->ndo_add_slave(upper_dev, dev);
1475                         if (err)
1476                                 return err;
1477                 } else {
1478                         return -EOPNOTSUPP;
1479                 }
1480         }
1481         return 0;
1482 }
1483
1484 static int do_setlink(const struct sk_buff *skb,
1485                       struct net_device *dev, struct ifinfomsg *ifm,
1486                       struct nlattr **tb, char *ifname, int modified)
1487 {
1488         const struct net_device_ops *ops = dev->netdev_ops;
1489         int err;
1490
1491         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1492                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1493                 if (IS_ERR(net)) {
1494                         err = PTR_ERR(net);
1495                         goto errout;
1496                 }
1497                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1498                         err = -EPERM;
1499                         goto errout;
1500                 }
1501                 err = dev_change_net_namespace(dev, net, ifname);
1502                 put_net(net);
1503                 if (err)
1504                         goto errout;
1505                 modified = 1;
1506         }
1507
1508         if (tb[IFLA_MAP]) {
1509                 struct rtnl_link_ifmap *u_map;
1510                 struct ifmap k_map;
1511
1512                 if (!ops->ndo_set_config) {
1513                         err = -EOPNOTSUPP;
1514                         goto errout;
1515                 }
1516
1517                 if (!netif_device_present(dev)) {
1518                         err = -ENODEV;
1519                         goto errout;
1520                 }
1521
1522                 u_map = nla_data(tb[IFLA_MAP]);
1523                 k_map.mem_start = (unsigned long) u_map->mem_start;
1524                 k_map.mem_end = (unsigned long) u_map->mem_end;
1525                 k_map.base_addr = (unsigned short) u_map->base_addr;
1526                 k_map.irq = (unsigned char) u_map->irq;
1527                 k_map.dma = (unsigned char) u_map->dma;
1528                 k_map.port = (unsigned char) u_map->port;
1529
1530                 err = ops->ndo_set_config(dev, &k_map);
1531                 if (err < 0)
1532                         goto errout;
1533
1534                 modified = 1;
1535         }
1536
1537         if (tb[IFLA_ADDRESS]) {
1538                 struct sockaddr *sa;
1539                 int len;
1540
1541                 len = sizeof(sa_family_t) + dev->addr_len;
1542                 sa = kmalloc(len, GFP_KERNEL);
1543                 if (!sa) {
1544                         err = -ENOMEM;
1545                         goto errout;
1546                 }
1547                 sa->sa_family = dev->type;
1548                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1549                        dev->addr_len);
1550                 err = dev_set_mac_address(dev, sa);
1551                 kfree(sa);
1552                 if (err)
1553                         goto errout;
1554                 modified = 1;
1555         }
1556
1557         if (tb[IFLA_MTU]) {
1558                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1559                 if (err < 0)
1560                         goto errout;
1561                 modified = 1;
1562         }
1563
1564         if (tb[IFLA_GROUP]) {
1565                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1566                 modified = 1;
1567         }
1568
1569         /*
1570          * Interface selected by interface index but interface
1571          * name provided implies that a name change has been
1572          * requested.
1573          */
1574         if (ifm->ifi_index > 0 && ifname[0]) {
1575                 err = dev_change_name(dev, ifname);
1576                 if (err < 0)
1577                         goto errout;
1578                 modified = 1;
1579         }
1580
1581         if (tb[IFLA_IFALIAS]) {
1582                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1583                                     nla_len(tb[IFLA_IFALIAS]));
1584                 if (err < 0)
1585                         goto errout;
1586                 modified = 1;
1587         }
1588
1589         if (tb[IFLA_BROADCAST]) {
1590                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1591                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1592         }
1593
1594         if (ifm->ifi_flags || ifm->ifi_change) {
1595                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1596                 if (err < 0)
1597                         goto errout;
1598         }
1599
1600         if (tb[IFLA_MASTER]) {
1601                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1602                 if (err)
1603                         goto errout;
1604                 modified = 1;
1605         }
1606
1607         if (tb[IFLA_CARRIER]) {
1608                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1609                 if (err)
1610                         goto errout;
1611                 modified = 1;
1612         }
1613
1614         if (tb[IFLA_TXQLEN])
1615                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1616
1617         if (tb[IFLA_OPERSTATE])
1618                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1619
1620         if (tb[IFLA_LINKMODE]) {
1621                 write_lock_bh(&dev_base_lock);
1622                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1623                 write_unlock_bh(&dev_base_lock);
1624         }
1625
1626         if (tb[IFLA_VFINFO_LIST]) {
1627                 struct nlattr *attr;
1628                 int rem;
1629                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1630                         if (nla_type(attr) != IFLA_VF_INFO) {
1631                                 err = -EINVAL;
1632                                 goto errout;
1633                         }
1634                         err = do_setvfinfo(dev, attr);
1635                         if (err < 0)
1636                                 goto errout;
1637                         modified = 1;
1638                 }
1639         }
1640         err = 0;
1641
1642         if (tb[IFLA_VF_PORTS]) {
1643                 struct nlattr *port[IFLA_PORT_MAX+1];
1644                 struct nlattr *attr;
1645                 int vf;
1646                 int rem;
1647
1648                 err = -EOPNOTSUPP;
1649                 if (!ops->ndo_set_vf_port)
1650                         goto errout;
1651
1652                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1653                         if (nla_type(attr) != IFLA_VF_PORT)
1654                                 continue;
1655                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1656                                 attr, ifla_port_policy);
1657                         if (err < 0)
1658                                 goto errout;
1659                         if (!port[IFLA_PORT_VF]) {
1660                                 err = -EOPNOTSUPP;
1661                                 goto errout;
1662                         }
1663                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1664                         err = ops->ndo_set_vf_port(dev, vf, port);
1665                         if (err < 0)
1666                                 goto errout;
1667                         modified = 1;
1668                 }
1669         }
1670         err = 0;
1671
1672         if (tb[IFLA_PORT_SELF]) {
1673                 struct nlattr *port[IFLA_PORT_MAX+1];
1674
1675                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1676                         tb[IFLA_PORT_SELF], ifla_port_policy);
1677                 if (err < 0)
1678                         goto errout;
1679
1680                 err = -EOPNOTSUPP;
1681                 if (ops->ndo_set_vf_port)
1682                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1683                 if (err < 0)
1684                         goto errout;
1685                 modified = 1;
1686         }
1687
1688         if (tb[IFLA_AF_SPEC]) {
1689                 struct nlattr *af;
1690                 int rem;
1691
1692                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1693                         const struct rtnl_af_ops *af_ops;
1694
1695                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1696                                 BUG();
1697
1698                         err = af_ops->set_link_af(dev, af);
1699                         if (err < 0)
1700                                 goto errout;
1701
1702                         modified = 1;
1703                 }
1704         }
1705         err = 0;
1706
1707 errout:
1708         if (err < 0 && modified)
1709                 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",
1710                                      dev->name);
1711
1712         return err;
1713 }
1714
1715 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1716 {
1717         struct net *net = sock_net(skb->sk);
1718         struct ifinfomsg *ifm;
1719         struct net_device *dev;
1720         int err;
1721         struct nlattr *tb[IFLA_MAX+1];
1722         char ifname[IFNAMSIZ];
1723
1724         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1725         if (err < 0)
1726                 goto errout;
1727
1728         if (tb[IFLA_IFNAME])
1729                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1730         else
1731                 ifname[0] = '\0';
1732
1733         err = -EINVAL;
1734         ifm = nlmsg_data(nlh);
1735         if (ifm->ifi_index > 0)
1736                 dev = __dev_get_by_index(net, ifm->ifi_index);
1737         else if (tb[IFLA_IFNAME])
1738                 dev = __dev_get_by_name(net, ifname);
1739         else
1740                 goto errout;
1741
1742         if (dev == NULL) {
1743                 err = -ENODEV;
1744                 goto errout;
1745         }
1746
1747         err = validate_linkmsg(dev, tb);
1748         if (err < 0)
1749                 goto errout;
1750
1751         err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1752 errout:
1753         return err;
1754 }
1755
1756 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1757 {
1758         struct net *net = sock_net(skb->sk);
1759         const struct rtnl_link_ops *ops;
1760         struct net_device *dev;
1761         struct ifinfomsg *ifm;
1762         char ifname[IFNAMSIZ];
1763         struct nlattr *tb[IFLA_MAX+1];
1764         int err;
1765         LIST_HEAD(list_kill);
1766
1767         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1768         if (err < 0)
1769                 return err;
1770
1771         if (tb[IFLA_IFNAME])
1772                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1773
1774         ifm = nlmsg_data(nlh);
1775         if (ifm->ifi_index > 0)
1776                 dev = __dev_get_by_index(net, ifm->ifi_index);
1777         else if (tb[IFLA_IFNAME])
1778                 dev = __dev_get_by_name(net, ifname);
1779         else
1780                 return -EINVAL;
1781
1782         if (!dev)
1783                 return -ENODEV;
1784
1785         ops = dev->rtnl_link_ops;
1786         if (!ops || !ops->dellink)
1787                 return -EOPNOTSUPP;
1788
1789         ops->dellink(dev, &list_kill);
1790         unregister_netdevice_many(&list_kill);
1791         return 0;
1792 }
1793
1794 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1795 {
1796         unsigned int old_flags;
1797         int err;
1798
1799         old_flags = dev->flags;
1800         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1801                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1802                 if (err < 0)
1803                         return err;
1804         }
1805
1806         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1807
1808         __dev_notify_flags(dev, old_flags, ~0U);
1809         return 0;
1810 }
1811 EXPORT_SYMBOL(rtnl_configure_link);
1812
1813 struct net_device *rtnl_create_link(struct net *net,
1814         char *ifname, unsigned char name_assign_type,
1815         const struct rtnl_link_ops *ops, struct nlattr *tb[])
1816 {
1817         int err;
1818         struct net_device *dev;
1819         unsigned int num_tx_queues = 1;
1820         unsigned int num_rx_queues = 1;
1821
1822         if (tb[IFLA_NUM_TX_QUEUES])
1823                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1824         else if (ops->get_num_tx_queues)
1825                 num_tx_queues = ops->get_num_tx_queues();
1826
1827         if (tb[IFLA_NUM_RX_QUEUES])
1828                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1829         else if (ops->get_num_rx_queues)
1830                 num_rx_queues = ops->get_num_rx_queues();
1831
1832         err = -ENOMEM;
1833         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
1834                                ops->setup, num_tx_queues, num_rx_queues);
1835         if (!dev)
1836                 goto err;
1837
1838         dev_net_set(dev, net);
1839         dev->rtnl_link_ops = ops;
1840         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1841
1842         if (tb[IFLA_MTU])
1843                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1844         if (tb[IFLA_ADDRESS]) {
1845                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1846                                 nla_len(tb[IFLA_ADDRESS]));
1847                 dev->addr_assign_type = NET_ADDR_SET;
1848         }
1849         if (tb[IFLA_BROADCAST])
1850                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1851                                 nla_len(tb[IFLA_BROADCAST]));
1852         if (tb[IFLA_TXQLEN])
1853                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1854         if (tb[IFLA_OPERSTATE])
1855                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1856         if (tb[IFLA_LINKMODE])
1857                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1858         if (tb[IFLA_GROUP])
1859                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1860
1861         return dev;
1862
1863 err:
1864         return ERR_PTR(err);
1865 }
1866 EXPORT_SYMBOL(rtnl_create_link);
1867
1868 static int rtnl_group_changelink(const struct sk_buff *skb,
1869                 struct net *net, int group,
1870                 struct ifinfomsg *ifm,
1871                 struct nlattr **tb)
1872 {
1873         struct net_device *dev;
1874         int err;
1875
1876         for_each_netdev(net, dev) {
1877                 if (dev->group == group) {
1878                         err = do_setlink(skb, dev, ifm, tb, NULL, 0);
1879                         if (err < 0)
1880                                 return err;
1881                 }
1882         }
1883
1884         return 0;
1885 }
1886
1887 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1888 {
1889         struct net *net = sock_net(skb->sk);
1890         const struct rtnl_link_ops *ops;
1891         const struct rtnl_link_ops *m_ops = NULL;
1892         struct net_device *dev;
1893         struct net_device *master_dev = NULL;
1894         struct ifinfomsg *ifm;
1895         char kind[MODULE_NAME_LEN];
1896         char ifname[IFNAMSIZ];
1897         struct nlattr *tb[IFLA_MAX+1];
1898         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1899         unsigned char name_assign_type = NET_NAME_USER;
1900         int err;
1901
1902 #ifdef CONFIG_MODULES
1903 replay:
1904 #endif
1905         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1906         if (err < 0)
1907                 return err;
1908
1909         if (tb[IFLA_IFNAME])
1910                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1911         else
1912                 ifname[0] = '\0';
1913
1914         ifm = nlmsg_data(nlh);
1915         if (ifm->ifi_index > 0)
1916                 dev = __dev_get_by_index(net, ifm->ifi_index);
1917         else {
1918                 if (ifname[0])
1919                         dev = __dev_get_by_name(net, ifname);
1920                 else
1921                         dev = NULL;
1922         }
1923
1924         if (dev) {
1925                 master_dev = netdev_master_upper_dev_get(dev);
1926                 if (master_dev)
1927                         m_ops = master_dev->rtnl_link_ops;
1928         }
1929
1930         err = validate_linkmsg(dev, tb);
1931         if (err < 0)
1932                 return err;
1933
1934         if (tb[IFLA_LINKINFO]) {
1935                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1936                                        tb[IFLA_LINKINFO], ifla_info_policy);
1937                 if (err < 0)
1938                         return err;
1939         } else
1940                 memset(linkinfo, 0, sizeof(linkinfo));
1941
1942         if (linkinfo[IFLA_INFO_KIND]) {
1943                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1944                 ops = rtnl_link_ops_get(kind);
1945         } else {
1946                 kind[0] = '\0';
1947                 ops = NULL;
1948         }
1949
1950         if (1) {
1951                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0];
1952                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 0];
1953                 struct nlattr **data = NULL;
1954                 struct nlattr **slave_data = NULL;
1955                 struct net *dest_net;
1956
1957                 if (ops) {
1958                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1959                                 err = nla_parse_nested(attr, ops->maxtype,
1960                                                        linkinfo[IFLA_INFO_DATA],
1961                                                        ops->policy);
1962                                 if (err < 0)
1963                                         return err;
1964                                 data = attr;
1965                         }
1966                         if (ops->validate) {
1967                                 err = ops->validate(tb, data);
1968                                 if (err < 0)
1969                                         return err;
1970                         }
1971                 }
1972
1973                 if (m_ops) {
1974                         if (m_ops->slave_maxtype &&
1975                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
1976                                 err = nla_parse_nested(slave_attr,
1977                                                        m_ops->slave_maxtype,
1978                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
1979                                                        m_ops->slave_policy);
1980                                 if (err < 0)
1981                                         return err;
1982                                 slave_data = slave_attr;
1983                         }
1984                         if (m_ops->slave_validate) {
1985                                 err = m_ops->slave_validate(tb, slave_data);
1986                                 if (err < 0)
1987                                         return err;
1988                         }
1989                 }
1990
1991                 if (dev) {
1992                         int modified = 0;
1993
1994                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1995                                 return -EEXIST;
1996                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1997                                 return -EOPNOTSUPP;
1998
1999                         if (linkinfo[IFLA_INFO_DATA]) {
2000                                 if (!ops || ops != dev->rtnl_link_ops ||
2001                                     !ops->changelink)
2002                                         return -EOPNOTSUPP;
2003
2004                                 err = ops->changelink(dev, tb, data);
2005                                 if (err < 0)
2006                                         return err;
2007                                 modified = 1;
2008                         }
2009
2010                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2011                                 if (!m_ops || !m_ops->slave_changelink)
2012                                         return -EOPNOTSUPP;
2013
2014                                 err = m_ops->slave_changelink(master_dev, dev,
2015                                                               tb, slave_data);
2016                                 if (err < 0)
2017                                         return err;
2018                                 modified = 1;
2019                         }
2020
2021                         return do_setlink(skb, dev, ifm, tb, ifname, modified);
2022                 }
2023
2024                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2025                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2026                                 return rtnl_group_changelink(skb, net,
2027                                                 nla_get_u32(tb[IFLA_GROUP]),
2028                                                 ifm, tb);
2029                         return -ENODEV;
2030                 }
2031
2032                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2033                         return -EOPNOTSUPP;
2034
2035                 if (!ops) {
2036 #ifdef CONFIG_MODULES
2037                         if (kind[0]) {
2038                                 __rtnl_unlock();
2039                                 request_module("rtnl-link-%s", kind);
2040                                 rtnl_lock();
2041                                 ops = rtnl_link_ops_get(kind);
2042                                 if (ops)
2043                                         goto replay;
2044                         }
2045 #endif
2046                         return -EOPNOTSUPP;
2047                 }
2048
2049                 if (!ops->setup)
2050                         return -EOPNOTSUPP;
2051
2052                 if (!ifname[0]) {
2053                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2054                         name_assign_type = NET_NAME_ENUM;
2055                 }
2056
2057                 dest_net = rtnl_link_get_net(net, tb);
2058                 if (IS_ERR(dest_net))
2059                         return PTR_ERR(dest_net);
2060
2061                 dev = rtnl_create_link(dest_net, ifname, name_assign_type, ops, tb);
2062                 if (IS_ERR(dev)) {
2063                         err = PTR_ERR(dev);
2064                         goto out;
2065                 }
2066
2067                 dev->ifindex = ifm->ifi_index;
2068
2069                 if (ops->newlink) {
2070                         err = ops->newlink(net, dev, tb, data);
2071                         /* Drivers should call free_netdev() in ->destructor
2072                          * and unregister it on failure after registration
2073                          * so that device could be finally freed in rtnl_unlock.
2074                          */
2075                         if (err < 0) {
2076                                 /* If device is not registered at all, free it now */
2077                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2078                                         free_netdev(dev);
2079                                 goto out;
2080                         }
2081                 } else {
2082                         err = register_netdevice(dev);
2083                         if (err < 0) {
2084                                 free_netdev(dev);
2085                                 goto out;
2086                         }
2087                 }
2088                 err = rtnl_configure_link(dev, ifm);
2089                 if (err < 0)
2090                         unregister_netdevice(dev);
2091 out:
2092                 put_net(dest_net);
2093                 return err;
2094         }
2095 }
2096
2097 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2098 {
2099         struct net *net = sock_net(skb->sk);
2100         struct ifinfomsg *ifm;
2101         char ifname[IFNAMSIZ];
2102         struct nlattr *tb[IFLA_MAX+1];
2103         struct net_device *dev = NULL;
2104         struct sk_buff *nskb;
2105         int err;
2106         u32 ext_filter_mask = 0;
2107
2108         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2109         if (err < 0)
2110                 return err;
2111
2112         if (tb[IFLA_IFNAME])
2113                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2114
2115         if (tb[IFLA_EXT_MASK])
2116                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2117
2118         ifm = nlmsg_data(nlh);
2119         if (ifm->ifi_index > 0)
2120                 dev = __dev_get_by_index(net, ifm->ifi_index);
2121         else if (tb[IFLA_IFNAME])
2122                 dev = __dev_get_by_name(net, ifname);
2123         else
2124                 return -EINVAL;
2125
2126         if (dev == NULL)
2127                 return -ENODEV;
2128
2129         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2130         if (nskb == NULL)
2131                 return -ENOBUFS;
2132
2133         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2134                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2135         if (err < 0) {
2136                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2137                 WARN_ON(err == -EMSGSIZE);
2138                 kfree_skb(nskb);
2139         } else
2140                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2141
2142         return err;
2143 }
2144
2145 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2146 {
2147         struct net *net = sock_net(skb->sk);
2148         struct net_device *dev;
2149         struct nlattr *tb[IFLA_MAX+1];
2150         u32 ext_filter_mask = 0;
2151         u16 min_ifinfo_dump_size = 0;
2152         int hdrlen;
2153
2154         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2155         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2156                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2157
2158         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2159                 if (tb[IFLA_EXT_MASK])
2160                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2161         }
2162
2163         if (!ext_filter_mask)
2164                 return NLMSG_GOODSIZE;
2165         /*
2166          * traverse the list of net devices and compute the minimum
2167          * buffer size based upon the filter mask.
2168          */
2169         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2170                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2171                                              if_nlmsg_size(dev,
2172                                                            ext_filter_mask));
2173         }
2174
2175         return min_ifinfo_dump_size;
2176 }
2177
2178 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2179 {
2180         int idx;
2181         int s_idx = cb->family;
2182
2183         if (s_idx == 0)
2184                 s_idx = 1;
2185         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2186                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2187                 if (idx < s_idx || idx == PF_PACKET)
2188                         continue;
2189                 if (rtnl_msg_handlers[idx] == NULL ||
2190                     rtnl_msg_handlers[idx][type].dumpit == NULL)
2191                         continue;
2192                 if (idx > s_idx) {
2193                         memset(&cb->args[0], 0, sizeof(cb->args));
2194                         cb->prev_seq = 0;
2195                         cb->seq = 0;
2196                 }
2197                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2198                         break;
2199         }
2200         cb->family = idx;
2201
2202         return skb->len;
2203 }
2204
2205 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2206                   gfp_t flags)
2207 {
2208         struct net *net = dev_net(dev);
2209         struct sk_buff *skb;
2210         int err = -ENOBUFS;
2211         size_t if_info_size;
2212
2213         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2214         if (skb == NULL)
2215                 goto errout;
2216
2217         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2218         if (err < 0) {
2219                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2220                 WARN_ON(err == -EMSGSIZE);
2221                 kfree_skb(skb);
2222                 goto errout;
2223         }
2224         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2225         return;
2226 errout:
2227         if (err < 0)
2228                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2229 }
2230 EXPORT_SYMBOL(rtmsg_ifinfo);
2231
2232 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2233                                    struct net_device *dev,
2234                                    u8 *addr, u32 pid, u32 seq,
2235                                    int type, unsigned int flags,
2236                                    int nlflags)
2237 {
2238         struct nlmsghdr *nlh;
2239         struct ndmsg *ndm;
2240
2241         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2242         if (!nlh)
2243                 return -EMSGSIZE;
2244
2245         ndm = nlmsg_data(nlh);
2246         ndm->ndm_family  = AF_BRIDGE;
2247         ndm->ndm_pad1    = 0;
2248         ndm->ndm_pad2    = 0;
2249         ndm->ndm_flags   = flags;
2250         ndm->ndm_type    = 0;
2251         ndm->ndm_ifindex = dev->ifindex;
2252         ndm->ndm_state   = NUD_PERMANENT;
2253
2254         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2255                 goto nla_put_failure;
2256
2257         return nlmsg_end(skb, nlh);
2258
2259 nla_put_failure:
2260         nlmsg_cancel(skb, nlh);
2261         return -EMSGSIZE;
2262 }
2263
2264 static inline size_t rtnl_fdb_nlmsg_size(void)
2265 {
2266         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2267 }
2268
2269 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2270 {
2271         struct net *net = dev_net(dev);
2272         struct sk_buff *skb;
2273         int err = -ENOBUFS;
2274
2275         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2276         if (!skb)
2277                 goto errout;
2278
2279         err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0);
2280         if (err < 0) {
2281                 kfree_skb(skb);
2282                 goto errout;
2283         }
2284
2285         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2286         return;
2287 errout:
2288         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2289 }
2290
2291 /**
2292  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2293  */
2294 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2295                      struct nlattr *tb[],
2296                      struct net_device *dev,
2297                      const unsigned char *addr,
2298                      u16 flags)
2299 {
2300         int err = -EINVAL;
2301
2302         /* If aging addresses are supported device will need to
2303          * implement its own handler for this.
2304          */
2305         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2306                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2307                 return err;
2308         }
2309
2310         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2311                 err = dev_uc_add_excl(dev, addr);
2312         else if (is_multicast_ether_addr(addr))
2313                 err = dev_mc_add_excl(dev, addr);
2314
2315         /* Only return duplicate errors if NLM_F_EXCL is set */
2316         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2317                 err = 0;
2318
2319         return err;
2320 }
2321 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2322
2323 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2324 {
2325         struct net *net = sock_net(skb->sk);
2326         struct ndmsg *ndm;
2327         struct nlattr *tb[NDA_MAX+1];
2328         struct net_device *dev;
2329         u8 *addr;
2330         int err;
2331
2332         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2333         if (err < 0)
2334                 return err;
2335
2336         ndm = nlmsg_data(nlh);
2337         if (ndm->ndm_ifindex == 0) {
2338                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2339                 return -EINVAL;
2340         }
2341
2342         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2343         if (dev == NULL) {
2344                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2345                 return -ENODEV;
2346         }
2347
2348         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2349                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2350                 return -EINVAL;
2351         }
2352
2353         addr = nla_data(tb[NDA_LLADDR]);
2354
2355         err = -EOPNOTSUPP;
2356
2357         /* Support fdb on master device the net/bridge default case */
2358         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2359             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2360                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2361                 const struct net_device_ops *ops = br_dev->netdev_ops;
2362
2363                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2364                 if (err)
2365                         goto out;
2366                 else
2367                         ndm->ndm_flags &= ~NTF_MASTER;
2368         }
2369
2370         /* Embedded bridge, macvlan, and any other device support */
2371         if ((ndm->ndm_flags & NTF_SELF)) {
2372                 if (dev->netdev_ops->ndo_fdb_add)
2373                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2374                                                            nlh->nlmsg_flags);
2375                 else
2376                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2377                                                nlh->nlmsg_flags);
2378
2379                 if (!err) {
2380                         rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2381                         ndm->ndm_flags &= ~NTF_SELF;
2382                 }
2383         }
2384 out:
2385         return err;
2386 }
2387
2388 /**
2389  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2390  */
2391 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2392                      struct nlattr *tb[],
2393                      struct net_device *dev,
2394                      const unsigned char *addr)
2395 {
2396         int err = -EINVAL;
2397
2398         /* If aging addresses are supported device will need to
2399          * implement its own handler for this.
2400          */
2401         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2402                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2403                 return err;
2404         }
2405
2406         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2407                 err = dev_uc_del(dev, addr);
2408         else if (is_multicast_ether_addr(addr))
2409                 err = dev_mc_del(dev, addr);
2410
2411         return err;
2412 }
2413 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2414
2415 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2416 {
2417         struct net *net = sock_net(skb->sk);
2418         struct ndmsg *ndm;
2419         struct nlattr *tb[NDA_MAX+1];
2420         struct net_device *dev;
2421         int err = -EINVAL;
2422         __u8 *addr;
2423
2424         if (!netlink_capable(skb, CAP_NET_ADMIN))
2425                 return -EPERM;
2426
2427         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2428         if (err < 0)
2429                 return err;
2430
2431         ndm = nlmsg_data(nlh);
2432         if (ndm->ndm_ifindex == 0) {
2433                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2434                 return -EINVAL;
2435         }
2436
2437         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2438         if (dev == NULL) {
2439                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2440                 return -ENODEV;
2441         }
2442
2443         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2444                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2445                 return -EINVAL;
2446         }
2447
2448         addr = nla_data(tb[NDA_LLADDR]);
2449
2450         err = -EOPNOTSUPP;
2451
2452         /* Support fdb on master device the net/bridge default case */
2453         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2454             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2455                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2456                 const struct net_device_ops *ops = br_dev->netdev_ops;
2457
2458                 if (ops->ndo_fdb_del)
2459                         err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2460
2461                 if (err)
2462                         goto out;
2463                 else
2464                         ndm->ndm_flags &= ~NTF_MASTER;
2465         }
2466
2467         /* Embedded bridge, macvlan, and any other device support */
2468         if (ndm->ndm_flags & NTF_SELF) {
2469                 if (dev->netdev_ops->ndo_fdb_del)
2470                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2471                 else
2472                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2473
2474                 if (!err) {
2475                         rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2476                         ndm->ndm_flags &= ~NTF_SELF;
2477                 }
2478         }
2479 out:
2480         return err;
2481 }
2482
2483 static int nlmsg_populate_fdb(struct sk_buff *skb,
2484                               struct netlink_callback *cb,
2485                               struct net_device *dev,
2486                               int *idx,
2487                               struct netdev_hw_addr_list *list)
2488 {
2489         struct netdev_hw_addr *ha;
2490         int err;
2491         u32 portid, seq;
2492
2493         portid = NETLINK_CB(cb->skb).portid;
2494         seq = cb->nlh->nlmsg_seq;
2495
2496         list_for_each_entry(ha, &list->list, list) {
2497                 if (*idx < cb->args[0])
2498                         goto skip;
2499
2500                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2501                                               portid, seq,
2502                                               RTM_NEWNEIGH, NTF_SELF,
2503                                               NLM_F_MULTI);
2504                 if (err < 0)
2505                         return err;
2506 skip:
2507                 *idx += 1;
2508         }
2509         return 0;
2510 }
2511
2512 /**
2513  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2514  * @nlh: netlink message header
2515  * @dev: netdevice
2516  *
2517  * Default netdevice operation to dump the existing unicast address list.
2518  * Returns number of addresses from list put in skb.
2519  */
2520 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2521                       struct netlink_callback *cb,
2522                       struct net_device *dev,
2523                       struct net_device *filter_dev,
2524                       int idx)
2525 {
2526         int err;
2527
2528         netif_addr_lock_bh(dev);
2529         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2530         if (err)
2531                 goto out;
2532         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2533 out:
2534         netif_addr_unlock_bh(dev);
2535         return idx;
2536 }
2537 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2538
2539 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2540 {
2541         struct net_device *dev;
2542         struct nlattr *tb[IFLA_MAX+1];
2543         struct net_device *bdev = NULL;
2544         struct net_device *br_dev = NULL;
2545         const struct net_device_ops *ops = NULL;
2546         const struct net_device_ops *cops = NULL;
2547         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2548         struct net *net = sock_net(skb->sk);
2549         int brport_idx = 0;
2550         int br_idx = 0;
2551         int idx = 0;
2552
2553         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2554                         ifla_policy) == 0) {
2555                 if (tb[IFLA_MASTER])
2556                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
2557         }
2558
2559         brport_idx = ifm->ifi_index;
2560
2561         if (br_idx) {
2562                 br_dev = __dev_get_by_index(net, br_idx);
2563                 if (!br_dev)
2564                         return -ENODEV;
2565
2566                 ops = br_dev->netdev_ops;
2567                 bdev = br_dev;
2568         }
2569
2570         for_each_netdev(net, dev) {
2571                 if (brport_idx && (dev->ifindex != brport_idx))
2572                         continue;
2573
2574                 if (!br_idx) { /* user did not specify a specific bridge */
2575                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
2576                                 br_dev = netdev_master_upper_dev_get(dev);
2577                                 cops = br_dev->netdev_ops;
2578                         }
2579
2580                         bdev = dev;
2581                 } else {
2582                         if (dev != br_dev &&
2583                             !(dev->priv_flags & IFF_BRIDGE_PORT))
2584                                 continue;
2585
2586                         if (br_dev != netdev_master_upper_dev_get(dev) &&
2587                             !(dev->priv_flags & IFF_EBRIDGE))
2588                                 continue;
2589
2590                         bdev = br_dev;
2591                         cops = ops;
2592                 }
2593
2594                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2595                         if (cops && cops->ndo_fdb_dump)
2596                                 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2597                                                          idx);
2598                 }
2599
2600                 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2601                 if (dev->netdev_ops->ndo_fdb_dump)
2602                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, bdev, dev,
2603                                                             idx);
2604
2605                 cops = NULL;
2606         }
2607
2608         cb->args[0] = idx;
2609         return skb->len;
2610 }
2611
2612 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2613                             struct net_device *dev, u16 mode)
2614 {
2615         struct nlmsghdr *nlh;
2616         struct ifinfomsg *ifm;
2617         struct nlattr *br_afspec;
2618         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2619         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2620
2621         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2622         if (nlh == NULL)
2623                 return -EMSGSIZE;
2624
2625         ifm = nlmsg_data(nlh);
2626         ifm->ifi_family = AF_BRIDGE;
2627         ifm->__ifi_pad = 0;
2628         ifm->ifi_type = dev->type;
2629         ifm->ifi_index = dev->ifindex;
2630         ifm->ifi_flags = dev_get_flags(dev);
2631         ifm->ifi_change = 0;
2632
2633
2634         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2635             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2636             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2637             (br_dev &&
2638              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2639             (dev->addr_len &&
2640              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2641             (dev->ifindex != dev->iflink &&
2642              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2643                 goto nla_put_failure;
2644
2645         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2646         if (!br_afspec)
2647                 goto nla_put_failure;
2648
2649         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2650             nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2651                 nla_nest_cancel(skb, br_afspec);
2652                 goto nla_put_failure;
2653         }
2654         nla_nest_end(skb, br_afspec);
2655
2656         return nlmsg_end(skb, nlh);
2657 nla_put_failure:
2658         nlmsg_cancel(skb, nlh);
2659         return -EMSGSIZE;
2660 }
2661 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2662
2663 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2664 {
2665         struct net *net = sock_net(skb->sk);
2666         struct net_device *dev;
2667         int idx = 0;
2668         u32 portid = NETLINK_CB(cb->skb).portid;
2669         u32 seq = cb->nlh->nlmsg_seq;
2670         struct nlattr *extfilt;
2671         u32 filter_mask = 0;
2672
2673         extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2674                                   IFLA_EXT_MASK);
2675         if (extfilt)
2676                 filter_mask = nla_get_u32(extfilt);
2677
2678         rcu_read_lock();
2679         for_each_netdev_rcu(net, dev) {
2680                 const struct net_device_ops *ops = dev->netdev_ops;
2681                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2682
2683                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2684                         if (idx >= cb->args[0] &&
2685                             br_dev->netdev_ops->ndo_bridge_getlink(
2686                                     skb, portid, seq, dev, filter_mask) < 0)
2687                                 break;
2688                         idx++;
2689                 }
2690
2691                 if (ops->ndo_bridge_getlink) {
2692                         if (idx >= cb->args[0] &&
2693                             ops->ndo_bridge_getlink(skb, portid, seq, dev,
2694                                                     filter_mask) < 0)
2695                                 break;
2696                         idx++;
2697                 }
2698         }
2699         rcu_read_unlock();
2700         cb->args[0] = idx;
2701
2702         return skb->len;
2703 }
2704
2705 static inline size_t bridge_nlmsg_size(void)
2706 {
2707         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2708                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
2709                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
2710                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
2711                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
2712                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
2713                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
2714                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
2715                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2716                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
2717                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
2718 }
2719
2720 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2721 {
2722         struct net *net = dev_net(dev);
2723         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2724         struct sk_buff *skb;
2725         int err = -EOPNOTSUPP;
2726
2727         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2728         if (!skb) {
2729                 err = -ENOMEM;
2730                 goto errout;
2731         }
2732
2733         if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2734             br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2735                 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2736                 if (err < 0)
2737                         goto errout;
2738         }
2739
2740         if ((flags & BRIDGE_FLAGS_SELF) &&
2741             dev->netdev_ops->ndo_bridge_getlink) {
2742                 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2743                 if (err < 0)
2744                         goto errout;
2745         }
2746
2747         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2748         return 0;
2749 errout:
2750         WARN_ON(err == -EMSGSIZE);
2751         kfree_skb(skb);
2752         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2753         return err;
2754 }
2755
2756 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2757 {
2758         struct net *net = sock_net(skb->sk);
2759         struct ifinfomsg *ifm;
2760         struct net_device *dev;
2761         struct nlattr *br_spec, *attr = NULL;
2762         int rem, err = -EOPNOTSUPP;
2763         u16 oflags, flags = 0;
2764         bool have_flags = false;
2765
2766         if (nlmsg_len(nlh) < sizeof(*ifm))
2767                 return -EINVAL;
2768
2769         ifm = nlmsg_data(nlh);
2770         if (ifm->ifi_family != AF_BRIDGE)
2771                 return -EPFNOSUPPORT;
2772
2773         dev = __dev_get_by_index(net, ifm->ifi_index);
2774         if (!dev) {
2775                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2776                 return -ENODEV;
2777         }
2778
2779         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2780         if (br_spec) {
2781                 nla_for_each_nested(attr, br_spec, rem) {
2782                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2783                                 have_flags = true;
2784                                 flags = nla_get_u16(attr);
2785                                 break;
2786                         }
2787                 }
2788         }
2789
2790         oflags = flags;
2791
2792         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2793                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2794
2795                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2796                         err = -EOPNOTSUPP;
2797                         goto out;
2798                 }
2799
2800                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2801                 if (err)
2802                         goto out;
2803
2804                 flags &= ~BRIDGE_FLAGS_MASTER;
2805         }
2806
2807         if ((flags & BRIDGE_FLAGS_SELF)) {
2808                 if (!dev->netdev_ops->ndo_bridge_setlink)
2809                         err = -EOPNOTSUPP;
2810                 else
2811                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2812
2813                 if (!err)
2814                         flags &= ~BRIDGE_FLAGS_SELF;
2815         }
2816
2817         if (have_flags)
2818                 memcpy(nla_data(attr), &flags, sizeof(flags));
2819         /* Generate event to notify upper layer of bridge change */
2820         if (!err)
2821                 err = rtnl_bridge_notify(dev, oflags);
2822 out:
2823         return err;
2824 }
2825
2826 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2827 {
2828         struct net *net = sock_net(skb->sk);
2829         struct ifinfomsg *ifm;
2830         struct net_device *dev;
2831         struct nlattr *br_spec, *attr = NULL;
2832         int rem, err = -EOPNOTSUPP;
2833         u16 oflags, flags = 0;
2834         bool have_flags = false;
2835
2836         if (nlmsg_len(nlh) < sizeof(*ifm))
2837                 return -EINVAL;
2838
2839         ifm = nlmsg_data(nlh);
2840         if (ifm->ifi_family != AF_BRIDGE)
2841                 return -EPFNOSUPPORT;
2842
2843         dev = __dev_get_by_index(net, ifm->ifi_index);
2844         if (!dev) {
2845                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2846                 return -ENODEV;
2847         }
2848
2849         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2850         if (br_spec) {
2851                 nla_for_each_nested(attr, br_spec, rem) {
2852                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2853                                 have_flags = true;
2854                                 flags = nla_get_u16(attr);
2855                                 break;
2856                         }
2857                 }
2858         }
2859
2860         oflags = flags;
2861
2862         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2863                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2864
2865                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2866                         err = -EOPNOTSUPP;
2867                         goto out;
2868                 }
2869
2870                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2871                 if (err)
2872                         goto out;
2873
2874                 flags &= ~BRIDGE_FLAGS_MASTER;
2875         }
2876
2877         if ((flags & BRIDGE_FLAGS_SELF)) {
2878                 if (!dev->netdev_ops->ndo_bridge_dellink)
2879                         err = -EOPNOTSUPP;
2880                 else
2881                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2882
2883                 if (!err)
2884                         flags &= ~BRIDGE_FLAGS_SELF;
2885         }
2886
2887         if (have_flags)
2888                 memcpy(nla_data(attr), &flags, sizeof(flags));
2889         /* Generate event to notify upper layer of bridge change */
2890         if (!err)
2891                 err = rtnl_bridge_notify(dev, oflags);
2892 out:
2893         return err;
2894 }
2895
2896 /* Process one rtnetlink message. */
2897
2898 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2899 {
2900         struct net *net = sock_net(skb->sk);
2901         rtnl_doit_func doit;
2902         int sz_idx, kind;
2903         int family;
2904         int type;
2905         int err;
2906
2907         type = nlh->nlmsg_type;
2908         if (type > RTM_MAX)
2909                 return -EOPNOTSUPP;
2910
2911         type -= RTM_BASE;
2912
2913         /* All the messages must have at least 1 byte length */
2914         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2915                 return 0;
2916
2917         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2918         sz_idx = type>>2;
2919         kind = type&3;
2920
2921         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
2922                 return -EPERM;
2923
2924         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2925                 struct sock *rtnl;
2926                 rtnl_dumpit_func dumpit;
2927                 rtnl_calcit_func calcit;
2928                 u16 min_dump_alloc = 0;
2929
2930                 dumpit = rtnl_get_dumpit(family, type);
2931                 if (dumpit == NULL)
2932                         return -EOPNOTSUPP;
2933                 calcit = rtnl_get_calcit(family, type);
2934                 if (calcit)
2935                         min_dump_alloc = calcit(skb, nlh);
2936
2937                 __rtnl_unlock();
2938                 rtnl = net->rtnl;
2939                 {
2940                         struct netlink_dump_control c = {
2941                                 .dump           = dumpit,
2942                                 .min_dump_alloc = min_dump_alloc,
2943                         };
2944                         err = netlink_dump_start(rtnl, skb, nlh, &c);
2945                 }
2946                 rtnl_lock();
2947                 return err;
2948         }
2949
2950         doit = rtnl_get_doit(family, type);
2951         if (doit == NULL)
2952                 return -EOPNOTSUPP;
2953
2954         return doit(skb, nlh);
2955 }
2956
2957 static void rtnetlink_rcv(struct sk_buff *skb)
2958 {
2959         rtnl_lock();
2960         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2961         rtnl_unlock();
2962 }
2963
2964 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2965 {
2966         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2967
2968         switch (event) {
2969         case NETDEV_UP:
2970         case NETDEV_DOWN:
2971         case NETDEV_PRE_UP:
2972         case NETDEV_POST_INIT:
2973         case NETDEV_REGISTER:
2974         case NETDEV_CHANGE:
2975         case NETDEV_PRE_TYPE_CHANGE:
2976         case NETDEV_GOING_DOWN:
2977         case NETDEV_UNREGISTER:
2978         case NETDEV_UNREGISTER_FINAL:
2979         case NETDEV_RELEASE:
2980         case NETDEV_JOIN:
2981                 break;
2982         default:
2983                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
2984                 break;
2985         }
2986         return NOTIFY_DONE;
2987 }
2988
2989 static struct notifier_block rtnetlink_dev_notifier = {
2990         .notifier_call  = rtnetlink_event,
2991 };
2992
2993
2994 static int __net_init rtnetlink_net_init(struct net *net)
2995 {
2996         struct sock *sk;
2997         struct netlink_kernel_cfg cfg = {
2998                 .groups         = RTNLGRP_MAX,
2999                 .input          = rtnetlink_rcv,
3000                 .cb_mutex       = &rtnl_mutex,
3001                 .flags          = NL_CFG_F_NONROOT_RECV,
3002         };
3003
3004         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3005         if (!sk)
3006                 return -ENOMEM;
3007         net->rtnl = sk;
3008         return 0;
3009 }
3010
3011 static void __net_exit rtnetlink_net_exit(struct net *net)
3012 {
3013         netlink_kernel_release(net->rtnl);
3014         net->rtnl = NULL;
3015 }
3016
3017 static struct pernet_operations rtnetlink_net_ops = {
3018         .init = rtnetlink_net_init,
3019         .exit = rtnetlink_net_exit,
3020 };
3021
3022 void __init rtnetlink_init(void)
3023 {
3024         if (register_pernet_subsys(&rtnetlink_net_ops))
3025                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3026
3027         register_netdevice_notifier(&rtnetlink_dev_notifier);
3028
3029         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3030                       rtnl_dump_ifinfo, rtnl_calcit);
3031         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3032         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3033         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3034
3035         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3036         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3037
3038         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3039         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3040         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3041
3042         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3043         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3044         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3045 }
3046