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_64bit(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
1178         memset(&map, 0, sizeof(map));
1179         map.mem_start   = dev->mem_start;
1180         map.mem_end     = dev->mem_end;
1181         map.base_addr   = dev->base_addr;
1182         map.irq         = dev->irq;
1183         map.dma         = dev->dma;
1184         map.port        = dev->if_port;
1185
1186         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1187                 return -EMSGSIZE;
1188
1189         return 0;
1190 }
1191
1192 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1193                             int type, u32 pid, u32 seq, u32 change,
1194                             unsigned int flags, u32 ext_filter_mask)
1195 {
1196         struct ifinfomsg *ifm;
1197         struct nlmsghdr *nlh;
1198         struct nlattr *af_spec;
1199         struct rtnl_af_ops *af_ops;
1200         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1201
1202         ASSERT_RTNL();
1203         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1204         if (nlh == NULL)
1205                 return -EMSGSIZE;
1206
1207         ifm = nlmsg_data(nlh);
1208         ifm->ifi_family = AF_UNSPEC;
1209         ifm->__ifi_pad = 0;
1210         ifm->ifi_type = dev->type;
1211         ifm->ifi_index = dev->ifindex;
1212         ifm->ifi_flags = dev_get_flags(dev);
1213         ifm->ifi_change = change;
1214
1215         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1216             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1217             nla_put_u8(skb, IFLA_OPERSTATE,
1218                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1219             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1220             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1221             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1222             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1223             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1224             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1225             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1226 #ifdef CONFIG_RPS
1227             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1228 #endif
1229             (dev->ifindex != dev_get_iflink(dev) &&
1230              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1231             (upper_dev &&
1232              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1233             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1234             (dev->qdisc &&
1235              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1236             (dev->ifalias &&
1237              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1238             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1239                         atomic_read(&dev->carrier_changes)) ||
1240             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1241                 goto nla_put_failure;
1242
1243         if (rtnl_fill_link_ifmap(skb, dev))
1244                 goto nla_put_failure;
1245
1246         if (dev->addr_len) {
1247                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1248                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1249                         goto nla_put_failure;
1250         }
1251
1252         if (rtnl_phys_port_id_fill(skb, dev))
1253                 goto nla_put_failure;
1254
1255         if (rtnl_phys_port_name_fill(skb, dev))
1256                 goto nla_put_failure;
1257
1258         if (rtnl_phys_switch_id_fill(skb, dev))
1259                 goto nla_put_failure;
1260
1261         if (rtnl_fill_stats(skb, dev))
1262                 goto nla_put_failure;
1263
1264         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1265             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1266                 goto nla_put_failure;
1267
1268         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent &&
1269             ext_filter_mask & RTEXT_FILTER_VF) {
1270                 int i;
1271                 struct nlattr *vfinfo;
1272                 int num_vfs = dev_num_vf(dev->dev.parent);
1273
1274                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1275                 if (!vfinfo)
1276                         goto nla_put_failure;
1277                 for (i = 0; i < num_vfs; i++) {
1278                         if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1279                                 goto nla_put_failure;
1280                 }
1281
1282                 nla_nest_end(skb, vfinfo);
1283         }
1284
1285         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1286                 goto nla_put_failure;
1287
1288         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1289                 if (rtnl_link_fill(skb, dev) < 0)
1290                         goto nla_put_failure;
1291         }
1292
1293         if (dev->rtnl_link_ops &&
1294             dev->rtnl_link_ops->get_link_net) {
1295                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1296
1297                 if (!net_eq(dev_net(dev), link_net)) {
1298                         int id = peernet2id_alloc(dev_net(dev), link_net);
1299
1300                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1301                                 goto nla_put_failure;
1302                 }
1303         }
1304
1305         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1306                 goto nla_put_failure;
1307
1308         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1309                 if (af_ops->fill_link_af) {
1310                         struct nlattr *af;
1311                         int err;
1312
1313                         if (!(af = nla_nest_start(skb, af_ops->family)))
1314                                 goto nla_put_failure;
1315
1316                         err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1317
1318                         /*
1319                          * Caller may return ENODATA to indicate that there
1320                          * was no data to be dumped. This is not an error, it
1321                          * means we should trim the attribute header and
1322                          * continue.
1323                          */
1324                         if (err == -ENODATA)
1325                                 nla_nest_cancel(skb, af);
1326                         else if (err < 0)
1327                                 goto nla_put_failure;
1328
1329                         nla_nest_end(skb, af);
1330                 }
1331         }
1332
1333         nla_nest_end(skb, af_spec);
1334
1335         nlmsg_end(skb, nlh);
1336         return 0;
1337
1338 nla_put_failure:
1339         nlmsg_cancel(skb, nlh);
1340         return -EMSGSIZE;
1341 }
1342
1343 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1344         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1345         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1346         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1347         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1348         [IFLA_MTU]              = { .type = NLA_U32 },
1349         [IFLA_LINK]             = { .type = NLA_U32 },
1350         [IFLA_MASTER]           = { .type = NLA_U32 },
1351         [IFLA_CARRIER]          = { .type = NLA_U8 },
1352         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1353         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1354         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1355         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1356         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1357         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1358         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1359         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1360         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1361         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1362         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1363         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1364         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1365         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1366         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1367         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1368         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1369         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1370         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1371         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1372         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1373 };
1374
1375 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1376         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1377         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1378         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1379         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1380 };
1381
1382 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1383         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1384         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1385         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1386         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1387         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1388         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1389         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1390         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1391         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1392         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1393         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1394 };
1395
1396 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1397         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1398         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1399                                     .len = PORT_PROFILE_MAX },
1400         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1401                                     .len = sizeof(struct ifla_port_vsi)},
1402         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1403                                       .len = PORT_UUID_MAX },
1404         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1405                                     .len = PORT_UUID_MAX },
1406         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1407         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1408 };
1409
1410 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1411 {
1412         const struct rtnl_link_ops *ops = NULL;
1413         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1414
1415         if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0)
1416                 return NULL;
1417
1418         if (linfo[IFLA_INFO_KIND]) {
1419                 char kind[MODULE_NAME_LEN];
1420
1421                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1422                 ops = rtnl_link_ops_get(kind);
1423         }
1424
1425         return ops;
1426 }
1427
1428 static bool link_master_filtered(struct net_device *dev, int master_idx)
1429 {
1430         struct net_device *master;
1431
1432         if (!master_idx)
1433                 return false;
1434
1435         master = netdev_master_upper_dev_get(dev);
1436         if (!master || master->ifindex != master_idx)
1437                 return true;
1438
1439         return false;
1440 }
1441
1442 static bool link_kind_filtered(const struct net_device *dev,
1443                                const struct rtnl_link_ops *kind_ops)
1444 {
1445         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1446                 return true;
1447
1448         return false;
1449 }
1450
1451 static bool link_dump_filtered(struct net_device *dev,
1452                                int master_idx,
1453                                const struct rtnl_link_ops *kind_ops)
1454 {
1455         if (link_master_filtered(dev, master_idx) ||
1456             link_kind_filtered(dev, kind_ops))
1457                 return true;
1458
1459         return false;
1460 }
1461
1462 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1463 {
1464         struct net *net = sock_net(skb->sk);
1465         int h, s_h;
1466         int idx = 0, s_idx;
1467         struct net_device *dev;
1468         struct hlist_head *head;
1469         struct nlattr *tb[IFLA_MAX+1];
1470         u32 ext_filter_mask = 0;
1471         const struct rtnl_link_ops *kind_ops = NULL;
1472         unsigned int flags = NLM_F_MULTI;
1473         int master_idx = 0;
1474         int err;
1475         int hdrlen;
1476
1477         s_h = cb->args[0];
1478         s_idx = cb->args[1];
1479
1480         cb->seq = net->dev_base_seq;
1481
1482         /* A hack to preserve kernel<->userspace interface.
1483          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1484          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1485          * what iproute2 < v3.9.0 used.
1486          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1487          * attribute, its netlink message is shorter than struct ifinfomsg.
1488          */
1489         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1490                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1491
1492         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1493
1494                 if (tb[IFLA_EXT_MASK])
1495                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1496
1497                 if (tb[IFLA_MASTER])
1498                         master_idx = nla_get_u32(tb[IFLA_MASTER]);
1499
1500                 if (tb[IFLA_LINKINFO])
1501                         kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1502
1503                 if (master_idx || kind_ops)
1504                         flags |= NLM_F_DUMP_FILTERED;
1505         }
1506
1507         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1508                 idx = 0;
1509                 head = &net->dev_index_head[h];
1510                 hlist_for_each_entry(dev, head, index_hlist) {
1511                         if (link_dump_filtered(dev, master_idx, kind_ops))
1512                                 continue;
1513                         if (idx < s_idx)
1514                                 goto cont;
1515                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1516                                                NETLINK_CB(cb->skb).portid,
1517                                                cb->nlh->nlmsg_seq, 0,
1518                                                flags,
1519                                                ext_filter_mask);
1520                         /* If we ran out of room on the first message,
1521                          * we're in trouble
1522                          */
1523                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1524
1525                         if (err < 0)
1526                                 goto out;
1527
1528                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1529 cont:
1530                         idx++;
1531                 }
1532         }
1533 out:
1534         cb->args[1] = idx;
1535         cb->args[0] = h;
1536
1537         return skb->len;
1538 }
1539
1540 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1541 {
1542         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1543 }
1544 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1545
1546 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1547 {
1548         struct net *net;
1549         /* Examine the link attributes and figure out which
1550          * network namespace we are talking about.
1551          */
1552         if (tb[IFLA_NET_NS_PID])
1553                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1554         else if (tb[IFLA_NET_NS_FD])
1555                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1556         else
1557                 net = get_net(src_net);
1558         return net;
1559 }
1560 EXPORT_SYMBOL(rtnl_link_get_net);
1561
1562 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1563 {
1564         if (dev) {
1565                 if (tb[IFLA_ADDRESS] &&
1566                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1567                         return -EINVAL;
1568
1569                 if (tb[IFLA_BROADCAST] &&
1570                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1571                         return -EINVAL;
1572         }
1573
1574         if (tb[IFLA_AF_SPEC]) {
1575                 struct nlattr *af;
1576                 int rem, err;
1577
1578                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1579                         const struct rtnl_af_ops *af_ops;
1580
1581                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1582                                 return -EAFNOSUPPORT;
1583
1584                         if (!af_ops->set_link_af)
1585                                 return -EOPNOTSUPP;
1586
1587                         if (af_ops->validate_link_af) {
1588                                 err = af_ops->validate_link_af(dev, af);
1589                                 if (err < 0)
1590                                         return err;
1591                         }
1592                 }
1593         }
1594
1595         return 0;
1596 }
1597
1598 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
1599                                   int guid_type)
1600 {
1601         const struct net_device_ops *ops = dev->netdev_ops;
1602
1603         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
1604 }
1605
1606 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
1607 {
1608         if (dev->type != ARPHRD_INFINIBAND)
1609                 return -EOPNOTSUPP;
1610
1611         return handle_infiniband_guid(dev, ivt, guid_type);
1612 }
1613
1614 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1615 {
1616         const struct net_device_ops *ops = dev->netdev_ops;
1617         int err = -EINVAL;
1618
1619         if (tb[IFLA_VF_MAC]) {
1620                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1621
1622                 err = -EOPNOTSUPP;
1623                 if (ops->ndo_set_vf_mac)
1624                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
1625                                                   ivm->mac);
1626                 if (err < 0)
1627                         return err;
1628         }
1629
1630         if (tb[IFLA_VF_VLAN]) {
1631                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1632
1633                 err = -EOPNOTSUPP;
1634                 if (ops->ndo_set_vf_vlan)
1635                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1636                                                    ivv->qos);
1637                 if (err < 0)
1638                         return err;
1639         }
1640
1641         if (tb[IFLA_VF_TX_RATE]) {
1642                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1643                 struct ifla_vf_info ivf;
1644
1645                 err = -EOPNOTSUPP;
1646                 if (ops->ndo_get_vf_config)
1647                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1648                 if (err < 0)
1649                         return err;
1650
1651                 err = -EOPNOTSUPP;
1652                 if (ops->ndo_set_vf_rate)
1653                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1654                                                    ivf.min_tx_rate,
1655                                                    ivt->rate);
1656                 if (err < 0)
1657                         return err;
1658         }
1659
1660         if (tb[IFLA_VF_RATE]) {
1661                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1662
1663                 err = -EOPNOTSUPP;
1664                 if (ops->ndo_set_vf_rate)
1665                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1666                                                    ivt->min_tx_rate,
1667                                                    ivt->max_tx_rate);
1668                 if (err < 0)
1669                         return err;
1670         }
1671
1672         if (tb[IFLA_VF_SPOOFCHK]) {
1673                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1674
1675                 err = -EOPNOTSUPP;
1676                 if (ops->ndo_set_vf_spoofchk)
1677                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1678                                                        ivs->setting);
1679                 if (err < 0)
1680                         return err;
1681         }
1682
1683         if (tb[IFLA_VF_LINK_STATE]) {
1684                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1685
1686                 err = -EOPNOTSUPP;
1687                 if (ops->ndo_set_vf_link_state)
1688                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1689                                                          ivl->link_state);
1690                 if (err < 0)
1691                         return err;
1692         }
1693
1694         if (tb[IFLA_VF_RSS_QUERY_EN]) {
1695                 struct ifla_vf_rss_query_en *ivrssq_en;
1696
1697                 err = -EOPNOTSUPP;
1698                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1699                 if (ops->ndo_set_vf_rss_query_en)
1700                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1701                                                            ivrssq_en->setting);
1702                 if (err < 0)
1703                         return err;
1704         }
1705
1706         if (tb[IFLA_VF_TRUST]) {
1707                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1708
1709                 err = -EOPNOTSUPP;
1710                 if (ops->ndo_set_vf_trust)
1711                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1712                 if (err < 0)
1713                         return err;
1714         }
1715
1716         if (tb[IFLA_VF_IB_NODE_GUID]) {
1717                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
1718
1719                 if (!ops->ndo_set_vf_guid)
1720                         return -EOPNOTSUPP;
1721
1722                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
1723         }
1724
1725         if (tb[IFLA_VF_IB_PORT_GUID]) {
1726                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
1727
1728                 if (!ops->ndo_set_vf_guid)
1729                         return -EOPNOTSUPP;
1730
1731                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
1732         }
1733
1734         return err;
1735 }
1736
1737 static int do_set_master(struct net_device *dev, int ifindex)
1738 {
1739         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1740         const struct net_device_ops *ops;
1741         int err;
1742
1743         if (upper_dev) {
1744                 if (upper_dev->ifindex == ifindex)
1745                         return 0;
1746                 ops = upper_dev->netdev_ops;
1747                 if (ops->ndo_del_slave) {
1748                         err = ops->ndo_del_slave(upper_dev, dev);
1749                         if (err)
1750                                 return err;
1751                 } else {
1752                         return -EOPNOTSUPP;
1753                 }
1754         }
1755
1756         if (ifindex) {
1757                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1758                 if (!upper_dev)
1759                         return -EINVAL;
1760                 ops = upper_dev->netdev_ops;
1761                 if (ops->ndo_add_slave) {
1762                         err = ops->ndo_add_slave(upper_dev, dev);
1763                         if (err)
1764                                 return err;
1765                 } else {
1766                         return -EOPNOTSUPP;
1767                 }
1768         }
1769         return 0;
1770 }
1771
1772 #define DO_SETLINK_MODIFIED     0x01
1773 /* notify flag means notify + modified. */
1774 #define DO_SETLINK_NOTIFY       0x03
1775 static int do_setlink(const struct sk_buff *skb,
1776                       struct net_device *dev, struct ifinfomsg *ifm,
1777                       struct nlattr **tb, char *ifname, int status)
1778 {
1779         const struct net_device_ops *ops = dev->netdev_ops;
1780         int err;
1781
1782         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1783                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1784                 if (IS_ERR(net)) {
1785                         err = PTR_ERR(net);
1786                         goto errout;
1787                 }
1788                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1789                         put_net(net);
1790                         err = -EPERM;
1791                         goto errout;
1792                 }
1793                 err = dev_change_net_namespace(dev, net, ifname);
1794                 put_net(net);
1795                 if (err)
1796                         goto errout;
1797                 status |= DO_SETLINK_MODIFIED;
1798         }
1799
1800         if (tb[IFLA_MAP]) {
1801                 struct rtnl_link_ifmap *u_map;
1802                 struct ifmap k_map;
1803
1804                 if (!ops->ndo_set_config) {
1805                         err = -EOPNOTSUPP;
1806                         goto errout;
1807                 }
1808
1809                 if (!netif_device_present(dev)) {
1810                         err = -ENODEV;
1811                         goto errout;
1812                 }
1813
1814                 u_map = nla_data(tb[IFLA_MAP]);
1815                 k_map.mem_start = (unsigned long) u_map->mem_start;
1816                 k_map.mem_end = (unsigned long) u_map->mem_end;
1817                 k_map.base_addr = (unsigned short) u_map->base_addr;
1818                 k_map.irq = (unsigned char) u_map->irq;
1819                 k_map.dma = (unsigned char) u_map->dma;
1820                 k_map.port = (unsigned char) u_map->port;
1821
1822                 err = ops->ndo_set_config(dev, &k_map);
1823                 if (err < 0)
1824                         goto errout;
1825
1826                 status |= DO_SETLINK_NOTIFY;
1827         }
1828
1829         if (tb[IFLA_ADDRESS]) {
1830                 struct sockaddr *sa;
1831                 int len;
1832
1833                 len = sizeof(sa_family_t) + dev->addr_len;
1834                 sa = kmalloc(len, GFP_KERNEL);
1835                 if (!sa) {
1836                         err = -ENOMEM;
1837                         goto errout;
1838                 }
1839                 sa->sa_family = dev->type;
1840                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1841                        dev->addr_len);
1842                 err = dev_set_mac_address(dev, sa);
1843                 kfree(sa);
1844                 if (err)
1845                         goto errout;
1846                 status |= DO_SETLINK_MODIFIED;
1847         }
1848
1849         if (tb[IFLA_MTU]) {
1850                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1851                 if (err < 0)
1852                         goto errout;
1853                 status |= DO_SETLINK_MODIFIED;
1854         }
1855
1856         if (tb[IFLA_GROUP]) {
1857                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1858                 status |= DO_SETLINK_NOTIFY;
1859         }
1860
1861         /*
1862          * Interface selected by interface index but interface
1863          * name provided implies that a name change has been
1864          * requested.
1865          */
1866         if (ifm->ifi_index > 0 && ifname[0]) {
1867                 err = dev_change_name(dev, ifname);
1868                 if (err < 0)
1869                         goto errout;
1870                 status |= DO_SETLINK_MODIFIED;
1871         }
1872
1873         if (tb[IFLA_IFALIAS]) {
1874                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1875                                     nla_len(tb[IFLA_IFALIAS]));
1876                 if (err < 0)
1877                         goto errout;
1878                 status |= DO_SETLINK_NOTIFY;
1879         }
1880
1881         if (tb[IFLA_BROADCAST]) {
1882                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1883                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1884         }
1885
1886         if (ifm->ifi_flags || ifm->ifi_change) {
1887                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1888                 if (err < 0)
1889                         goto errout;
1890         }
1891
1892         if (tb[IFLA_MASTER]) {
1893                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1894                 if (err)
1895                         goto errout;
1896                 status |= DO_SETLINK_MODIFIED;
1897         }
1898
1899         if (tb[IFLA_CARRIER]) {
1900                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1901                 if (err)
1902                         goto errout;
1903                 status |= DO_SETLINK_MODIFIED;
1904         }
1905
1906         if (tb[IFLA_TXQLEN]) {
1907                 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1908
1909                 if (dev->tx_queue_len ^ value)
1910                         status |= DO_SETLINK_NOTIFY;
1911
1912                 dev->tx_queue_len = value;
1913         }
1914
1915         if (tb[IFLA_OPERSTATE])
1916                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1917
1918         if (tb[IFLA_LINKMODE]) {
1919                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1920
1921                 write_lock_bh(&dev_base_lock);
1922                 if (dev->link_mode ^ value)
1923                         status |= DO_SETLINK_NOTIFY;
1924                 dev->link_mode = value;
1925                 write_unlock_bh(&dev_base_lock);
1926         }
1927
1928         if (tb[IFLA_VFINFO_LIST]) {
1929                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
1930                 struct nlattr *attr;
1931                 int rem;
1932
1933                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1934                         if (nla_type(attr) != IFLA_VF_INFO ||
1935                             nla_len(attr) < NLA_HDRLEN) {
1936                                 err = -EINVAL;
1937                                 goto errout;
1938                         }
1939                         err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
1940                                                ifla_vf_policy);
1941                         if (err < 0)
1942                                 goto errout;
1943                         err = do_setvfinfo(dev, vfinfo);
1944                         if (err < 0)
1945                                 goto errout;
1946                         status |= DO_SETLINK_NOTIFY;
1947                 }
1948         }
1949         err = 0;
1950
1951         if (tb[IFLA_VF_PORTS]) {
1952                 struct nlattr *port[IFLA_PORT_MAX+1];
1953                 struct nlattr *attr;
1954                 int vf;
1955                 int rem;
1956
1957                 err = -EOPNOTSUPP;
1958                 if (!ops->ndo_set_vf_port)
1959                         goto errout;
1960
1961                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1962                         if (nla_type(attr) != IFLA_VF_PORT ||
1963                             nla_len(attr) < NLA_HDRLEN) {
1964                                 err = -EINVAL;
1965                                 goto errout;
1966                         }
1967                         err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
1968                                                ifla_port_policy);
1969                         if (err < 0)
1970                                 goto errout;
1971                         if (!port[IFLA_PORT_VF]) {
1972                                 err = -EOPNOTSUPP;
1973                                 goto errout;
1974                         }
1975                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1976                         err = ops->ndo_set_vf_port(dev, vf, port);
1977                         if (err < 0)
1978                                 goto errout;
1979                         status |= DO_SETLINK_NOTIFY;
1980                 }
1981         }
1982         err = 0;
1983
1984         if (tb[IFLA_PORT_SELF]) {
1985                 struct nlattr *port[IFLA_PORT_MAX+1];
1986
1987                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1988                         tb[IFLA_PORT_SELF], ifla_port_policy);
1989                 if (err < 0)
1990                         goto errout;
1991
1992                 err = -EOPNOTSUPP;
1993                 if (ops->ndo_set_vf_port)
1994                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1995                 if (err < 0)
1996                         goto errout;
1997                 status |= DO_SETLINK_NOTIFY;
1998         }
1999
2000         if (tb[IFLA_AF_SPEC]) {
2001                 struct nlattr *af;
2002                 int rem;
2003
2004                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2005                         const struct rtnl_af_ops *af_ops;
2006
2007                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
2008                                 BUG();
2009
2010                         err = af_ops->set_link_af(dev, af);
2011                         if (err < 0)
2012                                 goto errout;
2013
2014                         status |= DO_SETLINK_NOTIFY;
2015                 }
2016         }
2017         err = 0;
2018
2019         if (tb[IFLA_PROTO_DOWN]) {
2020                 err = dev_change_proto_down(dev,
2021                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2022                 if (err)
2023                         goto errout;
2024                 status |= DO_SETLINK_NOTIFY;
2025         }
2026
2027 errout:
2028         if (status & DO_SETLINK_MODIFIED) {
2029                 if (status & DO_SETLINK_NOTIFY)
2030                         netdev_state_change(dev);
2031
2032                 if (err < 0)
2033                         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",
2034                                              dev->name);
2035         }
2036
2037         return err;
2038 }
2039
2040 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2041 {
2042         struct net *net = sock_net(skb->sk);
2043         struct ifinfomsg *ifm;
2044         struct net_device *dev;
2045         int err;
2046         struct nlattr *tb[IFLA_MAX+1];
2047         char ifname[IFNAMSIZ];
2048
2049         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2050         if (err < 0)
2051                 goto errout;
2052
2053         if (tb[IFLA_IFNAME])
2054                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2055         else
2056                 ifname[0] = '\0';
2057
2058         err = -EINVAL;
2059         ifm = nlmsg_data(nlh);
2060         if (ifm->ifi_index > 0)
2061                 dev = __dev_get_by_index(net, ifm->ifi_index);
2062         else if (tb[IFLA_IFNAME])
2063                 dev = __dev_get_by_name(net, ifname);
2064         else
2065                 goto errout;
2066
2067         if (dev == NULL) {
2068                 err = -ENODEV;
2069                 goto errout;
2070         }
2071
2072         err = validate_linkmsg(dev, tb);
2073         if (err < 0)
2074                 goto errout;
2075
2076         err = do_setlink(skb, dev, ifm, tb, ifname, 0);
2077 errout:
2078         return err;
2079 }
2080
2081 static int rtnl_group_dellink(const struct net *net, int group)
2082 {
2083         struct net_device *dev, *aux;
2084         LIST_HEAD(list_kill);
2085         bool found = false;
2086
2087         if (!group)
2088                 return -EPERM;
2089
2090         for_each_netdev(net, dev) {
2091                 if (dev->group == group) {
2092                         const struct rtnl_link_ops *ops;
2093
2094                         found = true;
2095                         ops = dev->rtnl_link_ops;
2096                         if (!ops || !ops->dellink)
2097                                 return -EOPNOTSUPP;
2098                 }
2099         }
2100
2101         if (!found)
2102                 return -ENODEV;
2103
2104         for_each_netdev_safe(net, dev, aux) {
2105                 if (dev->group == group) {
2106                         const struct rtnl_link_ops *ops;
2107
2108                         ops = dev->rtnl_link_ops;
2109                         ops->dellink(dev, &list_kill);
2110                 }
2111         }
2112         unregister_netdevice_many(&list_kill);
2113
2114         return 0;
2115 }
2116
2117 int rtnl_delete_link(struct net_device *dev)
2118 {
2119         const struct rtnl_link_ops *ops;
2120         LIST_HEAD(list_kill);
2121
2122         ops = dev->rtnl_link_ops;
2123         if (!ops || !ops->dellink)
2124                 return -EOPNOTSUPP;
2125
2126         ops->dellink(dev, &list_kill);
2127         unregister_netdevice_many(&list_kill);
2128
2129         return 0;
2130 }
2131 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2132
2133 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2134 {
2135         struct net *net = sock_net(skb->sk);
2136         struct net_device *dev;
2137         struct ifinfomsg *ifm;
2138         char ifname[IFNAMSIZ];
2139         struct nlattr *tb[IFLA_MAX+1];
2140         int err;
2141
2142         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2143         if (err < 0)
2144                 return err;
2145
2146         if (tb[IFLA_IFNAME])
2147                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2148
2149         ifm = nlmsg_data(nlh);
2150         if (ifm->ifi_index > 0)
2151                 dev = __dev_get_by_index(net, ifm->ifi_index);
2152         else if (tb[IFLA_IFNAME])
2153                 dev = __dev_get_by_name(net, ifname);
2154         else if (tb[IFLA_GROUP])
2155                 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2156         else
2157                 return -EINVAL;
2158
2159         if (!dev)
2160                 return -ENODEV;
2161
2162         return rtnl_delete_link(dev);
2163 }
2164
2165 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2166 {
2167         unsigned int old_flags;
2168         int err;
2169
2170         old_flags = dev->flags;
2171         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2172                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2173                 if (err < 0)
2174                         return err;
2175         }
2176
2177         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2178
2179         __dev_notify_flags(dev, old_flags, ~0U);
2180         return 0;
2181 }
2182 EXPORT_SYMBOL(rtnl_configure_link);
2183
2184 struct net_device *rtnl_create_link(struct net *net,
2185         const char *ifname, unsigned char name_assign_type,
2186         const struct rtnl_link_ops *ops, struct nlattr *tb[])
2187 {
2188         int err;
2189         struct net_device *dev;
2190         unsigned int num_tx_queues = 1;
2191         unsigned int num_rx_queues = 1;
2192
2193         if (tb[IFLA_NUM_TX_QUEUES])
2194                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2195         else if (ops->get_num_tx_queues)
2196                 num_tx_queues = ops->get_num_tx_queues();
2197
2198         if (tb[IFLA_NUM_RX_QUEUES])
2199                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2200         else if (ops->get_num_rx_queues)
2201                 num_rx_queues = ops->get_num_rx_queues();
2202
2203         err = -ENOMEM;
2204         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2205                                ops->setup, num_tx_queues, num_rx_queues);
2206         if (!dev)
2207                 goto err;
2208
2209         dev_net_set(dev, net);
2210         dev->rtnl_link_ops = ops;
2211         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2212
2213         if (tb[IFLA_MTU])
2214                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2215         if (tb[IFLA_ADDRESS]) {
2216                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2217                                 nla_len(tb[IFLA_ADDRESS]));
2218                 dev->addr_assign_type = NET_ADDR_SET;
2219         }
2220         if (tb[IFLA_BROADCAST])
2221                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2222                                 nla_len(tb[IFLA_BROADCAST]));
2223         if (tb[IFLA_TXQLEN])
2224                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2225         if (tb[IFLA_OPERSTATE])
2226                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2227         if (tb[IFLA_LINKMODE])
2228                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2229         if (tb[IFLA_GROUP])
2230                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2231
2232         return dev;
2233
2234 err:
2235         return ERR_PTR(err);
2236 }
2237 EXPORT_SYMBOL(rtnl_create_link);
2238
2239 static int rtnl_group_changelink(const struct sk_buff *skb,
2240                 struct net *net, int group,
2241                 struct ifinfomsg *ifm,
2242                 struct nlattr **tb)
2243 {
2244         struct net_device *dev, *aux;
2245         int err;
2246
2247         for_each_netdev_safe(net, dev, aux) {
2248                 if (dev->group == group) {
2249                         err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2250                         if (err < 0)
2251                                 return err;
2252                 }
2253         }
2254
2255         return 0;
2256 }
2257
2258 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2259 {
2260         struct net *net = sock_net(skb->sk);
2261         const struct rtnl_link_ops *ops;
2262         const struct rtnl_link_ops *m_ops = NULL;
2263         struct net_device *dev;
2264         struct net_device *master_dev = NULL;
2265         struct ifinfomsg *ifm;
2266         char kind[MODULE_NAME_LEN];
2267         char ifname[IFNAMSIZ];
2268         struct nlattr *tb[IFLA_MAX+1];
2269         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2270         unsigned char name_assign_type = NET_NAME_USER;
2271         int err;
2272
2273 #ifdef CONFIG_MODULES
2274 replay:
2275 #endif
2276         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2277         if (err < 0)
2278                 return err;
2279
2280         if (tb[IFLA_IFNAME])
2281                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2282         else
2283                 ifname[0] = '\0';
2284
2285         ifm = nlmsg_data(nlh);
2286         if (ifm->ifi_index > 0)
2287                 dev = __dev_get_by_index(net, ifm->ifi_index);
2288         else {
2289                 if (ifname[0])
2290                         dev = __dev_get_by_name(net, ifname);
2291                 else
2292                         dev = NULL;
2293         }
2294
2295         if (dev) {
2296                 master_dev = netdev_master_upper_dev_get(dev);
2297                 if (master_dev)
2298                         m_ops = master_dev->rtnl_link_ops;
2299         }
2300
2301         err = validate_linkmsg(dev, tb);
2302         if (err < 0)
2303                 return err;
2304
2305         if (tb[IFLA_LINKINFO]) {
2306                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2307                                        tb[IFLA_LINKINFO], ifla_info_policy);
2308                 if (err < 0)
2309                         return err;
2310         } else
2311                 memset(linkinfo, 0, sizeof(linkinfo));
2312
2313         if (linkinfo[IFLA_INFO_KIND]) {
2314                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2315                 ops = rtnl_link_ops_get(kind);
2316         } else {
2317                 kind[0] = '\0';
2318                 ops = NULL;
2319         }
2320
2321         if (1) {
2322                 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2323                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2324                 struct nlattr **data = NULL;
2325                 struct nlattr **slave_data = NULL;
2326                 struct net *dest_net, *link_net = NULL;
2327
2328                 if (ops) {
2329                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2330                                 err = nla_parse_nested(attr, ops->maxtype,
2331                                                        linkinfo[IFLA_INFO_DATA],
2332                                                        ops->policy);
2333                                 if (err < 0)
2334                                         return err;
2335                                 data = attr;
2336                         }
2337                         if (ops->validate) {
2338                                 err = ops->validate(tb, data);
2339                                 if (err < 0)
2340                                         return err;
2341                         }
2342                 }
2343
2344                 if (m_ops) {
2345                         if (m_ops->slave_maxtype &&
2346                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
2347                                 err = nla_parse_nested(slave_attr,
2348                                                        m_ops->slave_maxtype,
2349                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
2350                                                        m_ops->slave_policy);
2351                                 if (err < 0)
2352                                         return err;
2353                                 slave_data = slave_attr;
2354                         }
2355                         if (m_ops->slave_validate) {
2356                                 err = m_ops->slave_validate(tb, slave_data);
2357                                 if (err < 0)
2358                                         return err;
2359                         }
2360                 }
2361
2362                 if (dev) {
2363                         int status = 0;
2364
2365                         if (nlh->nlmsg_flags & NLM_F_EXCL)
2366                                 return -EEXIST;
2367                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
2368                                 return -EOPNOTSUPP;
2369
2370                         if (linkinfo[IFLA_INFO_DATA]) {
2371                                 if (!ops || ops != dev->rtnl_link_ops ||
2372                                     !ops->changelink)
2373                                         return -EOPNOTSUPP;
2374
2375                                 err = ops->changelink(dev, tb, data);
2376                                 if (err < 0)
2377                                         return err;
2378                                 status |= DO_SETLINK_NOTIFY;
2379                         }
2380
2381                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2382                                 if (!m_ops || !m_ops->slave_changelink)
2383                                         return -EOPNOTSUPP;
2384
2385                                 err = m_ops->slave_changelink(master_dev, dev,
2386                                                               tb, slave_data);
2387                                 if (err < 0)
2388                                         return err;
2389                                 status |= DO_SETLINK_NOTIFY;
2390                         }
2391
2392                         return do_setlink(skb, dev, ifm, tb, ifname, status);
2393                 }
2394
2395                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2396                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2397                                 return rtnl_group_changelink(skb, net,
2398                                                 nla_get_u32(tb[IFLA_GROUP]),
2399                                                 ifm, tb);
2400                         return -ENODEV;
2401                 }
2402
2403                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2404                         return -EOPNOTSUPP;
2405
2406                 if (!ops) {
2407 #ifdef CONFIG_MODULES
2408                         if (kind[0]) {
2409                                 __rtnl_unlock();
2410                                 request_module("rtnl-link-%s", kind);
2411                                 rtnl_lock();
2412                                 ops = rtnl_link_ops_get(kind);
2413                                 if (ops)
2414                                         goto replay;
2415                         }
2416 #endif
2417                         return -EOPNOTSUPP;
2418                 }
2419
2420                 if (!ops->setup)
2421                         return -EOPNOTSUPP;
2422
2423                 if (!ifname[0]) {
2424                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2425                         name_assign_type = NET_NAME_ENUM;
2426                 }
2427
2428                 dest_net = rtnl_link_get_net(net, tb);
2429                 if (IS_ERR(dest_net))
2430                         return PTR_ERR(dest_net);
2431
2432                 err = -EPERM;
2433                 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2434                         goto out;
2435
2436                 if (tb[IFLA_LINK_NETNSID]) {
2437                         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2438
2439                         link_net = get_net_ns_by_id(dest_net, id);
2440                         if (!link_net) {
2441                                 err =  -EINVAL;
2442                                 goto out;
2443                         }
2444                         err = -EPERM;
2445                         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2446                                 goto out;
2447                 }
2448
2449                 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2450                                        name_assign_type, ops, tb);
2451                 if (IS_ERR(dev)) {
2452                         err = PTR_ERR(dev);
2453                         goto out;
2454                 }
2455
2456                 dev->ifindex = ifm->ifi_index;
2457
2458                 if (ops->newlink) {
2459                         err = ops->newlink(link_net ? : net, dev, tb, data);
2460                         /* Drivers should call free_netdev() in ->destructor
2461                          * and unregister it on failure after registration
2462                          * so that device could be finally freed in rtnl_unlock.
2463                          */
2464                         if (err < 0) {
2465                                 /* If device is not registered at all, free it now */
2466                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2467                                         free_netdev(dev);
2468                                 goto out;
2469                         }
2470                 } else {
2471                         err = register_netdevice(dev);
2472                         if (err < 0) {
2473                                 free_netdev(dev);
2474                                 goto out;
2475                         }
2476                 }
2477                 err = rtnl_configure_link(dev, ifm);
2478                 if (err < 0)
2479                         goto out_unregister;
2480                 if (link_net) {
2481                         err = dev_change_net_namespace(dev, dest_net, ifname);
2482                         if (err < 0)
2483                                 goto out_unregister;
2484                 }
2485 out:
2486                 if (link_net)
2487                         put_net(link_net);
2488                 put_net(dest_net);
2489                 return err;
2490 out_unregister:
2491                 if (ops->newlink) {
2492                         LIST_HEAD(list_kill);
2493
2494                         ops->dellink(dev, &list_kill);
2495                         unregister_netdevice_many(&list_kill);
2496                 } else {
2497                         unregister_netdevice(dev);
2498                 }
2499                 goto out;
2500         }
2501 }
2502
2503 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2504 {
2505         struct net *net = sock_net(skb->sk);
2506         struct ifinfomsg *ifm;
2507         char ifname[IFNAMSIZ];
2508         struct nlattr *tb[IFLA_MAX+1];
2509         struct net_device *dev = NULL;
2510         struct sk_buff *nskb;
2511         int err;
2512         u32 ext_filter_mask = 0;
2513
2514         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2515         if (err < 0)
2516                 return err;
2517
2518         if (tb[IFLA_IFNAME])
2519                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2520
2521         if (tb[IFLA_EXT_MASK])
2522                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2523
2524         ifm = nlmsg_data(nlh);
2525         if (ifm->ifi_index > 0)
2526                 dev = __dev_get_by_index(net, ifm->ifi_index);
2527         else if (tb[IFLA_IFNAME])
2528                 dev = __dev_get_by_name(net, ifname);
2529         else
2530                 return -EINVAL;
2531
2532         if (dev == NULL)
2533                 return -ENODEV;
2534
2535         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2536         if (nskb == NULL)
2537                 return -ENOBUFS;
2538
2539         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2540                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2541         if (err < 0) {
2542                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2543                 WARN_ON(err == -EMSGSIZE);
2544                 kfree_skb(nskb);
2545         } else
2546                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2547
2548         return err;
2549 }
2550
2551 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2552 {
2553         struct net *net = sock_net(skb->sk);
2554         struct net_device *dev;
2555         struct nlattr *tb[IFLA_MAX+1];
2556         u32 ext_filter_mask = 0;
2557         u16 min_ifinfo_dump_size = 0;
2558         int hdrlen;
2559
2560         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2561         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2562                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2563
2564         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2565                 if (tb[IFLA_EXT_MASK])
2566                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2567         }
2568
2569         if (!ext_filter_mask)
2570                 return NLMSG_GOODSIZE;
2571         /*
2572          * traverse the list of net devices and compute the minimum
2573          * buffer size based upon the filter mask.
2574          */
2575         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2576                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2577                                              if_nlmsg_size(dev,
2578                                                            ext_filter_mask));
2579         }
2580
2581         return min_ifinfo_dump_size;
2582 }
2583
2584 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2585 {
2586         int idx;
2587         int s_idx = cb->family;
2588
2589         if (s_idx == 0)
2590                 s_idx = 1;
2591         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2592                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2593                 if (idx < s_idx || idx == PF_PACKET)
2594                         continue;
2595                 if (rtnl_msg_handlers[idx] == NULL ||
2596                     rtnl_msg_handlers[idx][type].dumpit == NULL)
2597                         continue;
2598                 if (idx > s_idx) {
2599                         memset(&cb->args[0], 0, sizeof(cb->args));
2600                         cb->prev_seq = 0;
2601                         cb->seq = 0;
2602                 }
2603                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2604                         break;
2605         }
2606         cb->family = idx;
2607
2608         return skb->len;
2609 }
2610
2611 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2612                                        unsigned int change, gfp_t flags)
2613 {
2614         struct net *net = dev_net(dev);
2615         struct sk_buff *skb;
2616         int err = -ENOBUFS;
2617         size_t if_info_size;
2618
2619         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2620         if (skb == NULL)
2621                 goto errout;
2622
2623         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2624         if (err < 0) {
2625                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2626                 WARN_ON(err == -EMSGSIZE);
2627                 kfree_skb(skb);
2628                 goto errout;
2629         }
2630         return skb;
2631 errout:
2632         if (err < 0)
2633                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2634         return NULL;
2635 }
2636
2637 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2638 {
2639         struct net *net = dev_net(dev);
2640
2641         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2642 }
2643
2644 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2645                   gfp_t flags)
2646 {
2647         struct sk_buff *skb;
2648
2649         if (dev->reg_state != NETREG_REGISTERED)
2650                 return;
2651
2652         skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2653         if (skb)
2654                 rtmsg_ifinfo_send(skb, dev, flags);
2655 }
2656 EXPORT_SYMBOL(rtmsg_ifinfo);
2657
2658 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2659                                    struct net_device *dev,
2660                                    u8 *addr, u16 vid, u32 pid, u32 seq,
2661                                    int type, unsigned int flags,
2662                                    int nlflags, u16 ndm_state)
2663 {
2664         struct nlmsghdr *nlh;
2665         struct ndmsg *ndm;
2666
2667         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2668         if (!nlh)
2669                 return -EMSGSIZE;
2670
2671         ndm = nlmsg_data(nlh);
2672         ndm->ndm_family  = AF_BRIDGE;
2673         ndm->ndm_pad1    = 0;
2674         ndm->ndm_pad2    = 0;
2675         ndm->ndm_flags   = flags;
2676         ndm->ndm_type    = 0;
2677         ndm->ndm_ifindex = dev->ifindex;
2678         ndm->ndm_state   = ndm_state;
2679
2680         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2681                 goto nla_put_failure;
2682         if (vid)
2683                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2684                         goto nla_put_failure;
2685
2686         nlmsg_end(skb, nlh);
2687         return 0;
2688
2689 nla_put_failure:
2690         nlmsg_cancel(skb, nlh);
2691         return -EMSGSIZE;
2692 }
2693
2694 static inline size_t rtnl_fdb_nlmsg_size(void)
2695 {
2696         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2697 }
2698
2699 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
2700                             u16 ndm_state)
2701 {
2702         struct net *net = dev_net(dev);
2703         struct sk_buff *skb;
2704         int err = -ENOBUFS;
2705
2706         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2707         if (!skb)
2708                 goto errout;
2709
2710         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2711                                       0, 0, type, NTF_SELF, 0, ndm_state);
2712         if (err < 0) {
2713                 kfree_skb(skb);
2714                 goto errout;
2715         }
2716
2717         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2718         return;
2719 errout:
2720         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2721 }
2722
2723 /**
2724  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2725  */
2726 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2727                      struct nlattr *tb[],
2728                      struct net_device *dev,
2729                      const unsigned char *addr, u16 vid,
2730                      u16 flags)
2731 {
2732         int err = -EINVAL;
2733
2734         /* If aging addresses are supported device will need to
2735          * implement its own handler for this.
2736          */
2737         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2738                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2739                 return err;
2740         }
2741
2742         if (vid) {
2743                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2744                 return err;
2745         }
2746
2747         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2748                 err = dev_uc_add_excl(dev, addr);
2749         else if (is_multicast_ether_addr(addr))
2750                 err = dev_mc_add_excl(dev, addr);
2751
2752         /* Only return duplicate errors if NLM_F_EXCL is set */
2753         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2754                 err = 0;
2755
2756         return err;
2757 }
2758 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2759
2760 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2761 {
2762         u16 vid = 0;
2763
2764         if (vlan_attr) {
2765                 if (nla_len(vlan_attr) != sizeof(u16)) {
2766                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2767                         return -EINVAL;
2768                 }
2769
2770                 vid = nla_get_u16(vlan_attr);
2771
2772                 if (!vid || vid >= VLAN_VID_MASK) {
2773                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2774                                 vid);
2775                         return -EINVAL;
2776                 }
2777         }
2778         *p_vid = vid;
2779         return 0;
2780 }
2781
2782 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2783 {
2784         struct net *net = sock_net(skb->sk);
2785         struct ndmsg *ndm;
2786         struct nlattr *tb[NDA_MAX+1];
2787         struct net_device *dev;
2788         u8 *addr;
2789         u16 vid;
2790         int err;
2791
2792         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2793         if (err < 0)
2794                 return err;
2795
2796         ndm = nlmsg_data(nlh);
2797         if (ndm->ndm_ifindex == 0) {
2798                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2799                 return -EINVAL;
2800         }
2801
2802         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2803         if (dev == NULL) {
2804                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2805                 return -ENODEV;
2806         }
2807
2808         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2809                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2810                 return -EINVAL;
2811         }
2812
2813         addr = nla_data(tb[NDA_LLADDR]);
2814
2815         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2816         if (err)
2817                 return err;
2818
2819         err = -EOPNOTSUPP;
2820
2821         /* Support fdb on master device the net/bridge default case */
2822         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2823             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2824                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2825                 const struct net_device_ops *ops = br_dev->netdev_ops;
2826
2827                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2828                                        nlh->nlmsg_flags);
2829                 if (err)
2830                         goto out;
2831                 else
2832                         ndm->ndm_flags &= ~NTF_MASTER;
2833         }
2834
2835         /* Embedded bridge, macvlan, and any other device support */
2836         if ((ndm->ndm_flags & NTF_SELF)) {
2837                 if (dev->netdev_ops->ndo_fdb_add)
2838                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2839                                                            vid,
2840                                                            nlh->nlmsg_flags);
2841                 else
2842                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2843                                                nlh->nlmsg_flags);
2844
2845                 if (!err) {
2846                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
2847                                         ndm->ndm_state);
2848                         ndm->ndm_flags &= ~NTF_SELF;
2849                 }
2850         }
2851 out:
2852         return err;
2853 }
2854
2855 /**
2856  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2857  */
2858 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2859                      struct nlattr *tb[],
2860                      struct net_device *dev,
2861                      const unsigned char *addr, u16 vid)
2862 {
2863         int err = -EINVAL;
2864
2865         /* If aging addresses are supported device will need to
2866          * implement its own handler for this.
2867          */
2868         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2869                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2870                 return err;
2871         }
2872
2873         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2874                 err = dev_uc_del(dev, addr);
2875         else if (is_multicast_ether_addr(addr))
2876                 err = dev_mc_del(dev, addr);
2877
2878         return err;
2879 }
2880 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2881
2882 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2883 {
2884         struct net *net = sock_net(skb->sk);
2885         struct ndmsg *ndm;
2886         struct nlattr *tb[NDA_MAX+1];
2887         struct net_device *dev;
2888         int err = -EINVAL;
2889         __u8 *addr;
2890         u16 vid;
2891
2892         if (!netlink_capable(skb, CAP_NET_ADMIN))
2893                 return -EPERM;
2894
2895         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2896         if (err < 0)
2897                 return err;
2898
2899         ndm = nlmsg_data(nlh);
2900         if (ndm->ndm_ifindex == 0) {
2901                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2902                 return -EINVAL;
2903         }
2904
2905         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2906         if (dev == NULL) {
2907                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2908                 return -ENODEV;
2909         }
2910
2911         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2912                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2913                 return -EINVAL;
2914         }
2915
2916         addr = nla_data(tb[NDA_LLADDR]);
2917
2918         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2919         if (err)
2920                 return err;
2921
2922         err = -EOPNOTSUPP;
2923
2924         /* Support fdb on master device the net/bridge default case */
2925         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2926             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2927                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2928                 const struct net_device_ops *ops = br_dev->netdev_ops;
2929
2930                 if (ops->ndo_fdb_del)
2931                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
2932
2933                 if (err)
2934                         goto out;
2935                 else
2936                         ndm->ndm_flags &= ~NTF_MASTER;
2937         }
2938
2939         /* Embedded bridge, macvlan, and any other device support */
2940         if (ndm->ndm_flags & NTF_SELF) {
2941                 if (dev->netdev_ops->ndo_fdb_del)
2942                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
2943                                                            vid);
2944                 else
2945                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
2946
2947                 if (!err) {
2948                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
2949                                         ndm->ndm_state);
2950                         ndm->ndm_flags &= ~NTF_SELF;
2951                 }
2952         }
2953 out:
2954         return err;
2955 }
2956
2957 static int nlmsg_populate_fdb(struct sk_buff *skb,
2958                               struct netlink_callback *cb,
2959                               struct net_device *dev,
2960                               int *idx,
2961                               struct netdev_hw_addr_list *list)
2962 {
2963         struct netdev_hw_addr *ha;
2964         int err;
2965         u32 portid, seq;
2966
2967         portid = NETLINK_CB(cb->skb).portid;
2968         seq = cb->nlh->nlmsg_seq;
2969
2970         list_for_each_entry(ha, &list->list, list) {
2971                 if (*idx < cb->args[0])
2972                         goto skip;
2973
2974                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
2975                                               portid, seq,
2976                                               RTM_NEWNEIGH, NTF_SELF,
2977                                               NLM_F_MULTI, NUD_PERMANENT);
2978                 if (err < 0)
2979                         return err;
2980 skip:
2981                 *idx += 1;
2982         }
2983         return 0;
2984 }
2985
2986 /**
2987  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2988  * @nlh: netlink message header
2989  * @dev: netdevice
2990  *
2991  * Default netdevice operation to dump the existing unicast address list.
2992  * Returns number of addresses from list put in skb.
2993  */
2994 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2995                       struct netlink_callback *cb,
2996                       struct net_device *dev,
2997                       struct net_device *filter_dev,
2998                       int idx)
2999 {
3000         int err;
3001
3002         netif_addr_lock_bh(dev);
3003         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
3004         if (err)
3005                 goto out;
3006         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
3007 out:
3008         netif_addr_unlock_bh(dev);
3009         cb->args[1] = err;
3010         return idx;
3011 }
3012 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3013
3014 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3015 {
3016         struct net_device *dev;
3017         struct nlattr *tb[IFLA_MAX+1];
3018         struct net_device *br_dev = NULL;
3019         const struct net_device_ops *ops = NULL;
3020         const struct net_device_ops *cops = NULL;
3021         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3022         struct net *net = sock_net(skb->sk);
3023         int brport_idx = 0;
3024         int br_idx = 0;
3025         int idx = 0;
3026
3027         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
3028                         ifla_policy) == 0) {
3029                 if (tb[IFLA_MASTER])
3030                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
3031         }
3032
3033         brport_idx = ifm->ifi_index;
3034
3035         if (br_idx) {
3036                 br_dev = __dev_get_by_index(net, br_idx);
3037                 if (!br_dev)
3038                         return -ENODEV;
3039
3040                 ops = br_dev->netdev_ops;
3041         }
3042
3043         cb->args[1] = 0;
3044         for_each_netdev(net, dev) {
3045                 if (brport_idx && (dev->ifindex != brport_idx))
3046                         continue;
3047
3048                 if (!br_idx) { /* user did not specify a specific bridge */
3049                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
3050                                 br_dev = netdev_master_upper_dev_get(dev);
3051                                 cops = br_dev->netdev_ops;
3052                         }
3053
3054                 } else {
3055                         if (dev != br_dev &&
3056                             !(dev->priv_flags & IFF_BRIDGE_PORT))
3057                                 continue;
3058
3059                         if (br_dev != netdev_master_upper_dev_get(dev) &&
3060                             !(dev->priv_flags & IFF_EBRIDGE))
3061                                 continue;
3062
3063                         cops = ops;
3064                 }
3065
3066                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3067                         if (cops && cops->ndo_fdb_dump)
3068                                 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
3069                                                          idx);
3070                 }
3071                 if (cb->args[1] == -EMSGSIZE)
3072                         break;
3073
3074                 if (dev->netdev_ops->ndo_fdb_dump)
3075                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
3076                                                             idx);
3077                 else
3078                         idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
3079                 if (cb->args[1] == -EMSGSIZE)
3080                         break;
3081
3082                 cops = NULL;
3083         }
3084
3085         cb->args[0] = idx;
3086         return skb->len;
3087 }
3088
3089 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3090                                unsigned int attrnum, unsigned int flag)
3091 {
3092         if (mask & flag)
3093                 return nla_put_u8(skb, attrnum, !!(flags & flag));
3094         return 0;
3095 }
3096
3097 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3098                             struct net_device *dev, u16 mode,
3099                             u32 flags, u32 mask, int nlflags,
3100                             u32 filter_mask,
3101                             int (*vlan_fill)(struct sk_buff *skb,
3102                                              struct net_device *dev,
3103                                              u32 filter_mask))
3104 {
3105         struct nlmsghdr *nlh;
3106         struct ifinfomsg *ifm;
3107         struct nlattr *br_afspec;
3108         struct nlattr *protinfo;
3109         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3110         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3111         int err = 0;
3112
3113         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3114         if (nlh == NULL)
3115                 return -EMSGSIZE;
3116
3117         ifm = nlmsg_data(nlh);
3118         ifm->ifi_family = AF_BRIDGE;
3119         ifm->__ifi_pad = 0;
3120         ifm->ifi_type = dev->type;
3121         ifm->ifi_index = dev->ifindex;
3122         ifm->ifi_flags = dev_get_flags(dev);
3123         ifm->ifi_change = 0;
3124
3125
3126         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3127             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3128             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3129             (br_dev &&
3130              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3131             (dev->addr_len &&
3132              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3133             (dev->ifindex != dev_get_iflink(dev) &&
3134              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3135                 goto nla_put_failure;
3136
3137         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3138         if (!br_afspec)
3139                 goto nla_put_failure;
3140
3141         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3142                 nla_nest_cancel(skb, br_afspec);
3143                 goto nla_put_failure;
3144         }
3145
3146         if (mode != BRIDGE_MODE_UNDEF) {
3147                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3148                         nla_nest_cancel(skb, br_afspec);
3149                         goto nla_put_failure;
3150                 }
3151         }
3152         if (vlan_fill) {
3153                 err = vlan_fill(skb, dev, filter_mask);
3154                 if (err) {
3155                         nla_nest_cancel(skb, br_afspec);
3156                         goto nla_put_failure;
3157                 }
3158         }
3159         nla_nest_end(skb, br_afspec);
3160
3161         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3162         if (!protinfo)
3163                 goto nla_put_failure;
3164
3165         if (brport_nla_put_flag(skb, flags, mask,
3166                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3167             brport_nla_put_flag(skb, flags, mask,
3168                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3169             brport_nla_put_flag(skb, flags, mask,
3170                                 IFLA_BRPORT_FAST_LEAVE,
3171                                 BR_MULTICAST_FAST_LEAVE) ||
3172             brport_nla_put_flag(skb, flags, mask,
3173                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3174             brport_nla_put_flag(skb, flags, mask,
3175                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3176             brport_nla_put_flag(skb, flags, mask,
3177                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3178             brport_nla_put_flag(skb, flags, mask,
3179                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3180             brport_nla_put_flag(skb, flags, mask,
3181                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3182                 nla_nest_cancel(skb, protinfo);
3183                 goto nla_put_failure;
3184         }
3185
3186         nla_nest_end(skb, protinfo);
3187
3188         nlmsg_end(skb, nlh);
3189         return 0;
3190 nla_put_failure:
3191         nlmsg_cancel(skb, nlh);
3192         return err ? err : -EMSGSIZE;
3193 }
3194 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3195
3196 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3197 {
3198         struct net *net = sock_net(skb->sk);
3199         struct net_device *dev;
3200         int idx = 0;
3201         u32 portid = NETLINK_CB(cb->skb).portid;
3202         u32 seq = cb->nlh->nlmsg_seq;
3203         u32 filter_mask = 0;
3204         int err;
3205
3206         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3207                 struct nlattr *extfilt;
3208
3209                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3210                                           IFLA_EXT_MASK);
3211                 if (extfilt) {
3212                         if (nla_len(extfilt) < sizeof(filter_mask))
3213                                 return -EINVAL;
3214
3215                         filter_mask = nla_get_u32(extfilt);
3216                 }
3217         }
3218
3219         rcu_read_lock();
3220         for_each_netdev_rcu(net, dev) {
3221                 const struct net_device_ops *ops = dev->netdev_ops;
3222                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3223
3224                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3225                         if (idx >= cb->args[0]) {
3226                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
3227                                                 skb, portid, seq, dev,
3228                                                 filter_mask, NLM_F_MULTI);
3229                                 if (err < 0 && err != -EOPNOTSUPP)
3230                                         break;
3231                         }
3232                         idx++;
3233                 }
3234
3235                 if (ops->ndo_bridge_getlink) {
3236                         if (idx >= cb->args[0]) {
3237                                 err = ops->ndo_bridge_getlink(skb, portid,
3238                                                               seq, dev,
3239                                                               filter_mask,
3240                                                               NLM_F_MULTI);
3241                                 if (err < 0 && err != -EOPNOTSUPP)
3242                                         break;
3243                         }
3244                         idx++;
3245                 }
3246         }
3247         rcu_read_unlock();
3248         cb->args[0] = idx;
3249
3250         return skb->len;
3251 }
3252
3253 static inline size_t bridge_nlmsg_size(void)
3254 {
3255         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3256                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
3257                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
3258                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
3259                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
3260                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
3261                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
3262                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
3263                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3264                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
3265                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
3266 }
3267
3268 static int rtnl_bridge_notify(struct net_device *dev)
3269 {
3270         struct net *net = dev_net(dev);
3271         struct sk_buff *skb;
3272         int err = -EOPNOTSUPP;
3273
3274         if (!dev->netdev_ops->ndo_bridge_getlink)
3275                 return 0;
3276
3277         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3278         if (!skb) {
3279                 err = -ENOMEM;
3280                 goto errout;
3281         }
3282
3283         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3284         if (err < 0)
3285                 goto errout;
3286
3287         if (!skb->len)
3288                 goto errout;
3289
3290         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3291         return 0;
3292 errout:
3293         WARN_ON(err == -EMSGSIZE);
3294         kfree_skb(skb);
3295         if (err)
3296                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3297         return err;
3298 }
3299
3300 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3301 {
3302         struct net *net = sock_net(skb->sk);
3303         struct ifinfomsg *ifm;
3304         struct net_device *dev;
3305         struct nlattr *br_spec, *attr = NULL;
3306         int rem, err = -EOPNOTSUPP;
3307         u16 flags = 0;
3308         bool have_flags = false;
3309
3310         if (nlmsg_len(nlh) < sizeof(*ifm))
3311                 return -EINVAL;
3312
3313         ifm = nlmsg_data(nlh);
3314         if (ifm->ifi_family != AF_BRIDGE)
3315                 return -EPFNOSUPPORT;
3316
3317         dev = __dev_get_by_index(net, ifm->ifi_index);
3318         if (!dev) {
3319                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3320                 return -ENODEV;
3321         }
3322
3323         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3324         if (br_spec) {
3325                 nla_for_each_nested(attr, br_spec, rem) {
3326                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3327                                 if (nla_len(attr) < sizeof(flags))
3328                                         return -EINVAL;
3329
3330                                 have_flags = true;
3331                                 flags = nla_get_u16(attr);
3332                                 break;
3333                         }
3334                 }
3335         }
3336
3337         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3338                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3339
3340                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3341                         err = -EOPNOTSUPP;
3342                         goto out;
3343                 }
3344
3345                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3346                 if (err)
3347                         goto out;
3348
3349                 flags &= ~BRIDGE_FLAGS_MASTER;
3350         }
3351
3352         if ((flags & BRIDGE_FLAGS_SELF)) {
3353                 if (!dev->netdev_ops->ndo_bridge_setlink)
3354                         err = -EOPNOTSUPP;
3355                 else
3356                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3357                                                                   flags);
3358                 if (!err) {
3359                         flags &= ~BRIDGE_FLAGS_SELF;
3360
3361                         /* Generate event to notify upper layer of bridge
3362                          * change
3363                          */
3364                         err = rtnl_bridge_notify(dev);
3365                 }
3366         }
3367
3368         if (have_flags)
3369                 memcpy(nla_data(attr), &flags, sizeof(flags));
3370 out:
3371         return err;
3372 }
3373
3374 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3375 {
3376         struct net *net = sock_net(skb->sk);
3377         struct ifinfomsg *ifm;
3378         struct net_device *dev;
3379         struct nlattr *br_spec, *attr = NULL;
3380         int rem, err = -EOPNOTSUPP;
3381         u16 flags = 0;
3382         bool have_flags = false;
3383
3384         if (nlmsg_len(nlh) < sizeof(*ifm))
3385                 return -EINVAL;
3386
3387         ifm = nlmsg_data(nlh);
3388         if (ifm->ifi_family != AF_BRIDGE)
3389                 return -EPFNOSUPPORT;
3390
3391         dev = __dev_get_by_index(net, ifm->ifi_index);
3392         if (!dev) {
3393                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3394                 return -ENODEV;
3395         }
3396
3397         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3398         if (br_spec) {
3399                 nla_for_each_nested(attr, br_spec, rem) {
3400                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3401                                 if (nla_len(attr) < sizeof(flags))
3402                                         return -EINVAL;
3403
3404                                 have_flags = true;
3405                                 flags = nla_get_u16(attr);
3406                                 break;
3407                         }
3408                 }
3409         }
3410
3411         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3412                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3413
3414                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3415                         err = -EOPNOTSUPP;
3416                         goto out;
3417                 }
3418
3419                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3420                 if (err)
3421                         goto out;
3422
3423                 flags &= ~BRIDGE_FLAGS_MASTER;
3424         }
3425
3426         if ((flags & BRIDGE_FLAGS_SELF)) {
3427                 if (!dev->netdev_ops->ndo_bridge_dellink)
3428                         err = -EOPNOTSUPP;
3429                 else
3430                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3431                                                                   flags);
3432
3433                 if (!err) {
3434                         flags &= ~BRIDGE_FLAGS_SELF;
3435
3436                         /* Generate event to notify upper layer of bridge
3437                          * change
3438                          */
3439                         err = rtnl_bridge_notify(dev);
3440                 }
3441         }
3442
3443         if (have_flags)
3444                 memcpy(nla_data(attr), &flags, sizeof(flags));
3445 out:
3446         return err;
3447 }
3448
3449 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
3450 {
3451         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
3452                (!idxattr || idxattr == attrid);
3453 }
3454
3455 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
3456                                int type, u32 pid, u32 seq, u32 change,
3457                                unsigned int flags, unsigned int filter_mask,
3458                                int *idxattr, int *prividx)
3459 {
3460         struct if_stats_msg *ifsm;
3461         struct nlmsghdr *nlh;
3462         struct nlattr *attr;
3463         int s_prividx = *prividx;
3464
3465         ASSERT_RTNL();
3466
3467         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
3468         if (!nlh)
3469                 return -EMSGSIZE;
3470
3471         ifsm = nlmsg_data(nlh);
3472         ifsm->ifindex = dev->ifindex;
3473         ifsm->filter_mask = filter_mask;
3474
3475         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
3476                 struct rtnl_link_stats64 *sp;
3477
3478                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
3479                                          sizeof(struct rtnl_link_stats64),
3480                                          IFLA_STATS_UNSPEC);
3481                 if (!attr)
3482                         goto nla_put_failure;
3483
3484                 sp = nla_data(attr);
3485                 dev_get_stats(dev, sp);
3486         }
3487
3488         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
3489                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3490
3491                 if (ops && ops->fill_linkxstats) {
3492                         int err;
3493
3494                         *idxattr = IFLA_STATS_LINK_XSTATS;
3495                         attr = nla_nest_start(skb,
3496                                               IFLA_STATS_LINK_XSTATS);
3497                         if (!attr)
3498                                 goto nla_put_failure;
3499
3500                         err = ops->fill_linkxstats(skb, dev, prividx);
3501                         nla_nest_end(skb, attr);
3502                         if (err)
3503                                 goto nla_put_failure;
3504                         *idxattr = 0;
3505                 }
3506         }
3507
3508         nlmsg_end(skb, nlh);
3509
3510         return 0;
3511
3512 nla_put_failure:
3513         /* not a multi message or no progress mean a real error */
3514         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
3515                 nlmsg_cancel(skb, nlh);
3516         else
3517                 nlmsg_end(skb, nlh);
3518
3519         return -EMSGSIZE;
3520 }
3521
3522 static const struct nla_policy ifla_stats_policy[IFLA_STATS_MAX + 1] = {
3523         [IFLA_STATS_LINK_64]    = { .len = sizeof(struct rtnl_link_stats64) },
3524 };
3525
3526 static size_t if_nlmsg_stats_size(const struct net_device *dev,
3527                                   u32 filter_mask)
3528 {
3529         size_t size = 0;
3530
3531         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
3532                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
3533
3534         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
3535                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3536
3537                 if (ops && ops->get_linkxstats_size) {
3538                         size += nla_total_size(ops->get_linkxstats_size(dev));
3539                         /* for IFLA_STATS_LINK_XSTATS */
3540                         size += nla_total_size(0);
3541                 }
3542         }
3543
3544         return size;
3545 }
3546
3547 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh)
3548 {
3549         struct net *net = sock_net(skb->sk);
3550         struct net_device *dev = NULL;
3551         int idxattr = 0, prividx = 0;
3552         struct if_stats_msg *ifsm;
3553         struct sk_buff *nskb;
3554         u32 filter_mask;
3555         int err;
3556
3557         ifsm = nlmsg_data(nlh);
3558         if (ifsm->ifindex > 0)
3559                 dev = __dev_get_by_index(net, ifsm->ifindex);
3560         else
3561                 return -EINVAL;
3562
3563         if (!dev)
3564                 return -ENODEV;
3565
3566         filter_mask = ifsm->filter_mask;
3567         if (!filter_mask)
3568                 return -EINVAL;
3569
3570         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
3571         if (!nskb)
3572                 return -ENOBUFS;
3573
3574         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
3575                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
3576                                   0, filter_mask, &idxattr, &prividx);
3577         if (err < 0) {
3578                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
3579                 WARN_ON(err == -EMSGSIZE);
3580                 kfree_skb(nskb);
3581         } else {
3582                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3583         }
3584
3585         return err;
3586 }
3587
3588 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
3589 {
3590         int h, s_h, err, s_idx, s_idxattr, s_prividx;
3591         struct net *net = sock_net(skb->sk);
3592         unsigned int flags = NLM_F_MULTI;
3593         struct if_stats_msg *ifsm;
3594         struct hlist_head *head;
3595         struct net_device *dev;
3596         u32 filter_mask = 0;
3597         int idx = 0;
3598
3599         s_h = cb->args[0];
3600         s_idx = cb->args[1];
3601         s_idxattr = cb->args[2];
3602         s_prividx = cb->args[3];
3603
3604         cb->seq = net->dev_base_seq;
3605
3606         ifsm = nlmsg_data(cb->nlh);
3607         filter_mask = ifsm->filter_mask;
3608         if (!filter_mask)
3609                 return -EINVAL;
3610
3611         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3612                 idx = 0;
3613                 head = &net->dev_index_head[h];
3614                 hlist_for_each_entry(dev, head, index_hlist) {
3615                         if (idx < s_idx)
3616                                 goto cont;
3617                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
3618                                                   NETLINK_CB(cb->skb).portid,
3619                                                   cb->nlh->nlmsg_seq, 0,
3620                                                   flags, filter_mask,
3621                                                   &s_idxattr, &s_prividx);
3622                         /* If we ran out of room on the first message,
3623                          * we're in trouble
3624                          */
3625                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
3626
3627                         if (err < 0)
3628                                 goto out;
3629                         s_prividx = 0;
3630                         s_idxattr = 0;
3631                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3632 cont:
3633                         idx++;
3634                 }
3635         }
3636 out:
3637         cb->args[3] = s_prividx;
3638         cb->args[2] = s_idxattr;
3639         cb->args[1] = idx;
3640         cb->args[0] = h;
3641
3642         return skb->len;
3643 }
3644
3645 /* Process one rtnetlink message. */
3646
3647 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3648 {
3649         struct net *net = sock_net(skb->sk);
3650         rtnl_doit_func doit;
3651         int kind;
3652         int family;
3653         int type;
3654         int err;
3655
3656         type = nlh->nlmsg_type;
3657         if (type > RTM_MAX)
3658                 return -EOPNOTSUPP;
3659
3660         type -= RTM_BASE;
3661
3662         /* All the messages must have at least 1 byte length */
3663         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3664                 return 0;
3665
3666         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3667         kind = type&3;
3668
3669         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3670                 return -EPERM;
3671
3672         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3673                 struct sock *rtnl;
3674                 rtnl_dumpit_func dumpit;
3675                 rtnl_calcit_func calcit;
3676                 u16 min_dump_alloc = 0;
3677
3678                 dumpit = rtnl_get_dumpit(family, type);
3679                 if (dumpit == NULL)
3680                         return -EOPNOTSUPP;
3681                 calcit = rtnl_get_calcit(family, type);
3682                 if (calcit)
3683                         min_dump_alloc = calcit(skb, nlh);
3684
3685                 __rtnl_unlock();
3686                 rtnl = net->rtnl;
3687                 {
3688                         struct netlink_dump_control c = {
3689                                 .dump           = dumpit,
3690                                 .min_dump_alloc = min_dump_alloc,
3691                         };
3692                         err = netlink_dump_start(rtnl, skb, nlh, &c);
3693                 }
3694                 rtnl_lock();
3695                 return err;
3696         }
3697
3698         doit = rtnl_get_doit(family, type);
3699         if (doit == NULL)
3700                 return -EOPNOTSUPP;
3701
3702         return doit(skb, nlh);
3703 }
3704
3705 static void rtnetlink_rcv(struct sk_buff *skb)
3706 {
3707         rtnl_lock();
3708         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3709         rtnl_unlock();
3710 }
3711
3712 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3713 {
3714         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3715
3716         switch (event) {
3717         case NETDEV_UP:
3718         case NETDEV_DOWN:
3719         case NETDEV_PRE_UP:
3720         case NETDEV_POST_INIT:
3721         case NETDEV_REGISTER:
3722         case NETDEV_CHANGE:
3723         case NETDEV_PRE_TYPE_CHANGE:
3724         case NETDEV_GOING_DOWN:
3725         case NETDEV_UNREGISTER:
3726         case NETDEV_UNREGISTER_FINAL:
3727         case NETDEV_RELEASE:
3728         case NETDEV_JOIN:
3729         case NETDEV_BONDING_INFO:
3730                 break;
3731         default:
3732                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3733                 break;
3734         }
3735         return NOTIFY_DONE;
3736 }
3737
3738 static struct notifier_block rtnetlink_dev_notifier = {
3739         .notifier_call  = rtnetlink_event,
3740 };
3741
3742
3743 static int __net_init rtnetlink_net_init(struct net *net)
3744 {
3745         struct sock *sk;
3746         struct netlink_kernel_cfg cfg = {
3747                 .groups         = RTNLGRP_MAX,
3748                 .input          = rtnetlink_rcv,
3749                 .cb_mutex       = &rtnl_mutex,
3750                 .flags          = NL_CFG_F_NONROOT_RECV,
3751         };
3752
3753         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3754         if (!sk)
3755                 return -ENOMEM;
3756         net->rtnl = sk;
3757         return 0;
3758 }
3759
3760 static void __net_exit rtnetlink_net_exit(struct net *net)
3761 {
3762         netlink_kernel_release(net->rtnl);
3763         net->rtnl = NULL;
3764 }
3765
3766 static struct pernet_operations rtnetlink_net_ops = {
3767         .init = rtnetlink_net_init,
3768         .exit = rtnetlink_net_exit,
3769 };
3770
3771 void __init rtnetlink_init(void)
3772 {
3773         if (register_pernet_subsys(&rtnetlink_net_ops))
3774                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3775
3776         register_netdevice_notifier(&rtnetlink_dev_notifier);
3777
3778         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3779                       rtnl_dump_ifinfo, rtnl_calcit);
3780         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3781         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3782         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3783
3784         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3785         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3786
3787         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3788         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3789         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3790
3791         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3792         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3793         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3794
3795         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
3796                       NULL);
3797 }