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